78 results about "SODIUM CHLORIDE GRANULES" patented technology

The invention discloses a method for preparing three-dimensional silk fibroin porous scaffold material, and relates to the field of biomaterial, in particular to the field of tissue engineering scaffolds. The method comprises: putting silk fibroin water solution with the volume concentration of 2-50wt% into a container, and adding sodium chloride into the silk fibroin water solution at 20-80 DEG C under continuous stirring, wherein the ratio between the mass (unit: gram) of sodium chloride granules and the volume (unit: ml) of silk fibroin solution is 1-20:1; after gelatinating, standing and precipitating the silk fibroin solution, taking out the precipitate to be continuously stirred and evenly mixed; then, putting the precipitate into a mould with the needed shape to be dried; finally, washing off the sodium chloride in the scaffold by distilled water, and obtaining the silk fibroin porous scaffold material having three-dimensional porous structure. No organic solvent is used in themethod, the method is simple and efficient, and the prepared silk fibroin porous scaffold has controllable porosity factor and pore size, highly communicated pore structure as well as degradability.

The invention relates to a ceramic core, in particular to a water-soluble ceramic core and a preparation method thereof, which can be used in investment casting of a casting with a complex cavity structure or a hollow casting with casting temperature of not greater than 900 DEG C. The water-soluble ceramic core is obtained by specifically taking fused corundum powder, zircon sand and sodium chloride particles as main body materials and NaCl solution and polyethylene glycol as adhesives through a specific mixing process by using low-temperature drying and a high-temperature roasting process. According to the water-soluble ceramic core, not only is the strength of the core guaranteed, but also the core has good moldability; and the water-soluble ceramic core has the advantages of convenience and quickness in operation (the core is only required to be washed with clear water and can be easily removed in a short time), no pollution, no need of special equipment, no damage to the casting and the like.

The invention discloses a hydroxyapatite-based biological composite scaffold composed of hydroxyapatite, silk fibroin and chitosan, wherein a mass ratio of the components is represented by that: HA:SF:CS=(60-80):(10-20):(10-20). The composite scaffold is in a porous shape, wherein the porosity is 70 to 90%, and the pore size is 150 to 200mun. The pores are basically round, and are communicated with each other. The invention also discloses a tissue engineered bone constructed by using the hydroxyapatite-based biological composite scaffold. According to the invention, BMSCs transfected with VEGF gene is implanted into the hydroxyapatite-based biological composite scaffold, such that the tissue engineered bone is formed. According to the invention, hydroxyapatite, silk fibroin and chitosanare are adopted as raw materials, and a porogen-leaching technology is combined with a vacuum drying technology, such that the hydroxyapatite-based biological composite scaffold material is prepared. A degradation rate of the scaffold is regulated through the regulation of the proportions of the components. The pore size distribution of the composite material is controlled through the regulations of the radiuses and the addition amount of sodium chloride particles.

The invention provides a fabric super-hydrophobic surface preparation method. The method at least includes steps: well mixing polydimethylsiloxane, hydroxyl polydimethylsiloxane, polymethylhydrosiloxane and a cross-linking agent to obtain polysiloxane finishing liquid; coating the fabric surface with the polysiloxane finishing liquid, and uniformly spreading a layer of sodium chloride particles onthe fabric surface to obtain a deposited coating; curing the deposited coating, subjecting the cured fabric to water-bath ultrasonic treatment, and drying to form the fabric super-hydrophobic surface. A super-hydrophobic fabric prepared according to the method is excellent in chemical stability and mechanical durability and has great water pressure resistance and breathability, a static contact angle of the super-hydrophobic surface reaches 155.47 degrees, a rolling angle is 5.5 degrees, breathability reaches 90.06mm / s, water pressure resistance reaches 2733Pa, and hydrophobicity of the fabric is almost unchanged after repeated washing and wear.

The invention relates to a preparation method of an RGD polypeptide grafted poly(maleic anhydride-hexamethylendiamine-DL-lactic acid) / modified hydroxyapatite porous composite material. The preparation method comprises the following steps: (1) introducing maleic anhydride and hexamethylendiamine to a side chain of polylactic acid at first, and then grafting adhesive RGD polypeptide; (2) dissolving the generated RGD polypeptide grafted poly(maleic anhydride-hexamethylendiamine-DL-lactic acid) in dichloromethane, adding modified nano modified hydroxyapatite, performing ultrasonic dispersion, stirring fully to mix uniformly, weighing sodium chloride particles screened by a molecular sieve, adding the sodium chloride particles into the mixed solution and stirring; and (3) when a solvent is volatilized, drying to perform volatilization, and soaking the material in distilled water to separate out the sodium chloride particles, thereby obtaining the RGD polypeptide grafted poly(maleic anhydride-hexamethylendiamine-DL-lactic acid) / modified hydroxyapatite porous composite material at last. The preparation method provided by the invention has the advantages that a manufacturing process is simple and controllable.

The invention relates to a tissue engineering stent based on low-temperature rapid modeling and a preparation method thereof. The preparation method comprises the following steps: mixing a polylactic acid-glycolic acid copolymer and an organic solvent in a mass ratio of 1: 6 to 1: 8 to prepare a PLGA (polylactic acid-glycolic acid) solution, and adding sodium chloride granules to obtain a printing slurry, wherein the mass ratio of the sodium chloride granules to the PLGA is 1: 2 to 2: 1; setting the fiber diameter to be 200-300 microns, setting the fiber spacing to be 300-350 microns, printing out a stent body containing the sodium chloride granules at a speed of 3-6mm / s, and removing the organic solvent and the sodium chloride to obtain the tissue engineering stent based on the low-temperature rapid modeling. According to the invention, through addition of an excipient, low-temperature printing of a PLGA material is achieved, and the defect of a too large or too small aperture size caused by high-temperature fused printing of a PLGA stent is overcome; the prepared PLGA stent is moderate in aperture size, can easily store cells, and has good biomechanical properties.

The invention belongs to the technical field of the purification of sodium chloride, and particularly relates to a purification method for industrial byproduct salt and a purification device for industrial byproduct salt. The purification method comprises the following steps of: mixing industrial byproduct salt with a sodium chloride water solution to obtain a turbid liquid; adding aqueous alkali into the turbid liquid to obtain a mixed solution with the pH value of 7-8, inputting the cleaning saturated sodium chloride water solution into a lower layer of the mixed solution, and overflowing the upper-layer solution of the mixed solution to obtain an overflowing liquid; sequentially filtering the overflowing liquid through a filter screen, an oil-water separator and a film to obtain the cleaning saturated sodium chloride water solution; and inputting the obtained cleaning saturated sodium chloride water solution into a lower layer of the mixed solution for washing in a recycling way to obtain the pure white sodium chloride particles, and carrying out the solid-liquid separation to obtain the high-purity industrial sodium chloride solid. The organic matters separated out of the method can be recycled. The method comprises the step of washing in a recycling way by saturated salt water, so that the yield of sodium chloride can be improved, and discharge of wastewater is avoided, and the consumption of heat energy is not needed.

The invention discloses a nano-micron self-soluble temporary plugging steering agent for acidification; the steering agent comprises the following components in parts: 0.5-1.5 parts by mass of an ironion stabilizer, 0.5-1.5 parts by mass of a clay stabilizer, 0.5-1.5 parts by mass of a discharge assisting agent, 0.5-1.5 parts by mass of a high temperature corrosion inhibitor, 0.05-0.15 part by mass of a dispersant, 0.1-0.3 part by mass of a suspending agent, 30-50 parts by volume of concentrated hydrochloric acid, 7-20 parts by mass of sodium chloride and 25-30 parts by mass of water. The formed steering agent is a sodium chloride particle substance with the particle size of less than 3 [mu]m, can enter a deep part of a reservoir and temporarily plug a high-permeability layer and net seams; along with the end of acidification construction, the sodium chloride particles playing the temporary plugging effect are dissolved in less than 10% of an acid residual liquid or formation water and plugging is removed. The steering agent does not contain organic polymer compounds, has the characteristics of no need of glue crosslinking, no need of glue breaking, self plugging removal, little damage to formation, simple preparation method, low cost and the like.

The invention provides a method for preparing a complex three-dimensional porous bone tissue engineering scaffold, which is characterized by specifically comprising the following steps: adding beta-tricalcium phosphate into n-butyl alcohol, mechanically stirring and ultrasonically dispersing the mixture at the same time, gradually dropping the dispersed solution into 6 to 10 mass percent silk fibroin solution, controlling the mass ratio of the beta-tricalcium phosphate to the silk fibroin at 10-50:100, and mechanically stirring the solution; adding sodium chloride granules with the grain diameter of 350 to 500 mu m serving as a pore-forming agent into the solution, placing the solution for 24 hours at the room temperature, and adding water into the solution and soaking the granules for 24 hours to wash out the pore-forming agent; and freezing and drying the mixture after the pore-forming agent is washed out to obtain the complex three-dimensional porous bone tissue engineering scaffold. The complex three-dimensional porous bone tissue engineering scaffold is characterized in that: the porosity of the scaffold is 92 to 98 percent, the aperture is 300 to 450 mu m, the compression modulus is 5.75 to 13.43MPa, and the water absorption rate is as high as 3,300 percent and the like; and the scaffold is suitable for restoration and replacement of bone defects.

The invention discloses a preparation method of a silicate glass hollow fiber membrane, which comprises the following steps: mixing and melting liquid paraffin and solid paraffin, and putting a silicate glass capillary into the melt to coat a paraffin layer on the glass capillary surface; attaching sodium chloride particles with a certain particle size range onto the paraffin layer on the glass capillary surface, and immersing the glass capillary into water until the sodium chloride particles are completely dissolved, thereby forming a porous structure on the paraffin layer on the glass capillary surface; immersing the glass capillary with a porous paraffin layer on the surface into a 5-30 wt% HF water solution to perform etching, thereby obtaining pores with pore sizes of 5-100 mu m on the silicate glass capillary surface; and calcining the glass capillary at 300-600 DEG C to lose the paraffin layer on the surface by burning, thereby finally obtaining the silicate glass hollow fiber membrane. The preparation method disclosed by the invention is simple, has the advantage of low technical cost, and can obtain the silicate glass hollow fiber membrane with the surface pore sizes of 5-100 mu m.

The present invention relates to one kind of antirust snow thawing agent and its production process. The antirust snow thawing agent consists of sodium chloride with water content of 2-5 wt% and antirust agent of tartaric acid or tartrate in 0.5-10 wt% of sodium chloride, and the antirust agent adhered onto the surface of sodium chloride forms one coating. The antirust snow thawing agent is produced through mixing tartaric acid or tartrate and sodium chloride to form tartaric acid or tartrate coated sodium chloride grain, stoving the mixture at 140-160 deg.c to water content below 1 wt%, sieving and cooling. The antirust snow thawing agent has less delaminating, raised snow thawing effect, high antirust capacity to inhibiting rusting of metal, and no environmental pollution.

The invention provides a method for preparing potassium chloride from carnallite. The low-sodium carnallite slurry is decomposed and crystallized for the first time in a first crystallizer 8a, magnesium chloride in carnallite is transferred into a liquid phase, part of potassium chloride transferred into the liquid phase is crystallized and separated out, and underflow of the first crystallizer 8acontains separated-out potassium chloride and undecomposed carnallite and sodium chloride particles. The underflow of the first crystallizer 8a is decomposed and crystallized in a second crystallizer8b, sodium chloride in carnallite is transferred into a liquid phase, part of potassium chloride transferred into the liquid phase is crystallized and separated out, and the underflow of the second crystallizer 8b contains separated potassium chloride and undecomposed carnallite and sodium chloride particles. The underflow of the second crystallizer 8b is screened, the oversize product comprisesundecomposed carnallite and sodium chloride particles, and a potassium chloride product is generated from the undersize product. The oversize product is crushed, wherein the crushed oversize product is used for generating the low-sodium carnallite slurry. The grade of potassium chloride is guaranteed, and meanwhile, the recovery rate of carnallite is greatly increased.

The invention relates to a preparation process of small-aperture foamed aluminum, and particularly relates to a preparation method of through-hole foamed aluminum with micron-scale aperture, high void ratio and uniformly distributed voids by powder metallurgy. The method comprises: mechanically and evenly mixing an appropriate amount of commercially pure aluminum powder and industrial sodium chloride granules as base materials with additives such as ethanol and other organic solvents; and adding the mixed powder into a mould, carrying out unidirectional pressing at the pressure of 230-450 MPa by utilizing a hydraulic press to prepare a precast block (green compact), placing the precast block into a furnace, insulating and sintering for 15-20 hours at the temperature of 660-800 DEG C, naturally cooling to room temperature, and heating the sintered blank for 8-15 hours in 75-95 DEG C water bath to obtain the small-aperture foamed aluminum.

The invention relates to a preparation process of a mask base material for killing and inactivating virus and germs and a mask. The preparation process comprises the following steps that sodium chloride particles are pulverized into sodium chloride powder, and non-woven fabric is coated with the sodium chloride powder to prepare an antiviral and germs-resistant mask base material; or the non-wovenfabric is soaked in a sodium chloride solution, the sodium chloride solution is infiltrated into the non-woven fabric through ultrasonic oscillation, and the anti-virus and germs-resistant mask basematerial is prepared through drying and hot pressing. The mask is prepared from the antiviral and germs-resistant mask base material, so that the mask has the function of killing and inactivating thevirus and the germs; and the mask base material can kill and inactivate the virus and the germs larger than the virus in volume, greatly improves the protection performance and effect of the mask, issafe and harmless to human bodies, is low in cost, and is suitable for mass production.

The invention discloses a preparation method of micro-nano graded porous copper. The preparation method is specifically implemented according to the following steps that S1, copper powder, manganese powder and sodium chloride particles are weighed according to a certain proportion and mixed uniformly; S2, the uniformly mixed powder in S1 is filled into a mold and pressed at a certain pressure, andthe pressure is maintained for a certain period of time; S3, a sample pressed in S2 is placed in a high-temperature tubular furnace, sintered at a certain heating rate, subjected to heat preservationfor a certain period of time, cooled along with the furnace and then taken out, and argon is introduced for protection in the whole process; S4, the surface of the sintered sample is polished to be bright on abrasive paper, and the sample is placed in deionized water of a constant-temperature water bath to be soaked in water; and S5, the sample soaked in water continues to be subjected to dealloying treatment with hydrochloric acid under the condition of the constant-temperature water bath, dealloying is completed when no obvious bubbles escape, and then composite porous copper with two-stagemicron-pores and single-stage nano-pores is obtained. The preparation method is beneficial for providing a larger specific surface area and improving the catalytic performance of a porous material.

The invention relates to a method for removing SO4<-2> in brine. The method comprises the following steps of: adding calcium chloride and magnesium sulfate into a bittern at 0 to 50 DEG C for reaction to generate calcium sulfate and magnesium chloride, wherein the adding amount of calcium chloride is the equivalent weight of magnesium sulfate in the bittern, and the content of the reacted magnesium sulfate in the bittern is required to be below 5 g / L; then evaporating, keeping warm, precipitating, cooling for crystallisation, decomposing and washing to obtain a potassium chloride product, wherein the content of SO4<-2> in the potassium chloride product produced by using master sauce as a material is below 2.8%; removing SO4<-2> from the bittern; entering the procedures of evaporating, keeping warm, precipitating, cooling for crystallisation, decomposing and washing to obtain the potassium chloride product, wherein a brine-mixing step can be omitted. Only sodium chloride is separated out in the steps of evaporating, keeping warm and precipitating. Because the particle of sodium chloride is bigger, solid-liquid separation is easy, potassium chloride is lost very little; the defect of losing a large amount of potassium chloride due to separating magnesium sulfate monohydrate in the prior art is avoided, and the recovery rate of potassium chloride is improved.

The invention relates to a bone rehabilitating material and a preparation method of the material. The invention provides a bone rehabilitating material, the effective components of which are prepared by the following weights and portions of raw materials: 40 of a PLGA; 20 to 80 of a semi-hydrated calcium sulphate; 2 to 8 of a rifampicin. The invention also provides the preparation method of the bone rehabilitating material. The invention mixes and solidifies the semi-hydrated calcium sulphate, the PLGA, the rifampicin and a sodium chloride granule and digests the sodium chloride granule to make a novel multi-hole bone rehabilitating material with a function of anti-bacillus tuberculosis.

The invention discloses a preparation technology of a water phase transmission drag reducer for slickwater fracturing, and belongs to the field of oil field chemical water phase drag reduction technology. The preparation technology comprises following steps: an acrylamide monomer aqueous solution with a mass concentration of 18.5 to 25.5% is prepared; tert-butylacrylamide is added, wherein the content of tert-Butylacrylamide is 0.2 to 2.0wt% of that of the acrylamide monomer aqueous solution; sodium carbonate is added, wherein the content of sodium carbonate is 2.5 to 8.0wt% of that of the acrylamide monomer aqueous solution; a chelating agent, a chain transfer agent, a chain extender and a water soluble azo-compound are added; the mixture is subjected to polymerization and hydrolysis so as to obtain gel blocks; the gel blocks are processed so as to obtain polyacrylamide powder; and the polyacrylamide powder is mixed with sodium chloride particles so as to obtain the water phase transmission drag reducer. An optimized application concentration of the water phase transmission drag reducer ranges from 250 to 500ppm; compatibility with common bactericides, antiswelling agents and discharge aiding agents is excellent; solution formed by the water phase transmission drag reducer is stable; drag reduction efficiency is high and lasts long; influence of water mineralization degree on preparation of slickwater is less; and the water phase transmission drag reducer is suitable for water with more than 10% calcium chloride.

The invention discloses a method for manufacturing a decorative base material taking sodium chloride particles as a main material. The method comprises the following steps: sodium chloride is taken as a base material, light burning powder and enriched bittern cakes are taken as adhesives, at first, sodium chloride and light burning powder are uniformly mixed to obtain a sodium chloride and light burning powder mixed material, the enriched bittern cakes are added in water to be prepared into a magnesium chloride solution; the prepared magnesium chloride solution is added into the sodium chloride and light burning powder mixed material at twice to be mixed till no bubbles occur so as to obtain a mixed material, then, the mixed material is injected into a die for molding, and the molded mixed material is demolded and maintained to obtain the decorative base material taking sodium chloride particles as the main material. The product, prepared by the method, is a material which is better in appearance, and has a mechanical property; and the material is expected to be used as indoor building materials, decorative materials and the like. The product material manufactured by the invention has the characteristics of good comprehensive performance, attractive appearance, green and environmental protection, and the adopted basic materials have wide sources, and are simple in operation of the production process and easiness in industrial production and popularization.

The invention discloses a production process of mashed purple sweet potatoes, which comprises the following steps: keeping picked purple sweet potatoes in a dark and ventilated place for 7 days at a temperature of 10.5-11.5 DEG C; cleaning and peeling the purple sweet potatoes; slicing; adding sodium chloride into purple sweet potato slices according to a weight ratio of purple sweet potato to sodium chloride particle of 100: 0.4; adding citric acid particles in the purple potatoes according to a weight ratio of purple sweet potato to citric acid particle of 100: 0.1, stirring and then standing for 5 min, so that the pH value is kept at 6.5; cooking at a temperature of 100 DEG C for 15 minutes; mashing; canning; and sterilizing for 20 minutes at a temperature of 121 to 122 DEG. According to the production processed provided by the invention, the content of monosaccharide in purple sweet potatoes is increased to promote anthocyanidin to exist in a stable form of anthocyanin; the sodium chloride particles are added to protect color, so that the color of the purple sweet potatoes can be better kept, and the purple sweet potatoes are purple red; meanwhile, most of anthocyanidin in the purple sweet potatoes can be retained, so that the loss of anthocyanidin is reduced.

The invention provides a method for preparing food-grade potassium chloride by utilizing potassium-containing tail salt. The method comprises the following steps: adding water into the potassium-containing tail salt and decomposing; filtering decomposed material slurry to obtain potassium-containing brine; solarizing the potassium-containing brine to obtain sylvite; carrying out hot dissolving onthe sylvite to obtain a dissolved solution; after concentrating the dissolved solution, obtaining supernatant and bottom flow containing sodium chloride particles; adding a filter aid into the supernatant and removing impurities to obtain a refined potassium chloride solution; cooling and crystallizing the refined potassium chloride, and carrying out solid-liquid separation to obtain the food-grade potassium chloride. The method provided by the invention has the advantages of resource saving, production cost reduction, convenience for operation and the like, and has a wide application prospect.

The invention provides a method for preparing potassium chloride from raw carnallite ore. The method comprises the following steps: carrying out flotation on raw carnallite ore slurry in a flotation device by using a flotation reagent to generate low-sodium carnallite slurry; decomposing and crystallizing the low-sodium carnallite slurry in a crystallizer to obtaining crystallizer underflow; screening the crystallizer underflow to obtain an oversize product and an undersize product, wherein the oversize product comprises undecomposed carnallite and sodium chloride particles, and the undersizeproduct is used for generating potassium chloride; and crushing the oversize product, detecting the content of sodium chloride in the crushed oversize product, and if the content of sodium chloride inthe oversize product is higher than a set value, applying the oversize product to generation of the low-sodium carnallite slurry, or if the content of sodium chloride in the oversize product is lowerthan the set value, applying the oversize product to generation of potassium chloride. Compared with the mode that the content of sodium chloride is not detected and oversize products are directly discharged, the method of the invention has the following advantages: materials in the oversize product are recycled again, and the utilization rate of the raw material in the production process is effectively increased.

The invention provides compositions and methods for delivering tastants. According to the invention, a method of making a tastant composition may generally comprise granulating an edible carrier and a first tastant and coating the granules with a second tastant. A tastant composition may generally comprise a core including a mixture of an edible carrier and a first tastant, and a coating on the core, the coating comprising a second tastant, and optionally a binder. Each of the first tastant and second tastant may comprise sodium chloride particles. The tastant composition may provide a substitute for a conventional tastant topping with a comparable appearance, e.g., comparable particle size, color, and morphology, as well as a comparable taste profile (time v. flavor intensity), but with significantly lower tastant content.

The invention relates to the technical field of artificial rainfall, and provides an artificial rainfall agent and a preparation method and application thereof. The artificial rainfall agent comprisessodium chloride particles and titanium dioxide coatings coated on the surfaces of the sodium chloride particles. The artificial rainfall agent provided by the invention is non-toxic and harmless, hasstrong water vapor adsorption capacity, can improve the artificial rainfall efficiency and rainfall capacity, and can be used as condensation nucleus to continuously increase water drops and ice crystals in the cloud and reduce the water drops and ice crystals into rain when being scattered in the cloud layer. In the rainfall process, raindrops enable tiny dust particles and the like to fall ontothe ground, so that the effects of removing haze and reducing PM2.5 are achieved. Besides, titanium dioxide has a photocatalysis effect and can degrade pollutants in air and water, so that the haze removal effect is further improved. When the artificial rainfall agent provided by the invention is applied to artificial precipitation enhancement, hail suppression and haze treatment, an excellent effect can be achieved.

The invention relates to a method for rapidly distinguishing potassium chloride particles and sodium chloride particles. The method is characterized in that a sodium tetraphenyl borate solution is prepared by utilizing an organic solvent, the surface of a to-be-detected particle is wetted by utilizing the sodium tetraphenyl borate solution, and the potassium chloride particles and the sodium chloride particles can be distinguished by observing whether the liquid on the surface of the particle is turbid or not or whether needle-shaped precipitates are generated on the surface of the particle or not, wherein the particle with needle-shaped attachments on the surface is the potassium chloride particle; the particle with a liquid on the surface being turbid and having white precipitates is the potassium chloride particle. The sodium tetraphenyl borate alcohol solution reacts with the potassium chloride to generate stable white precipitates which are attached onto the surface of the potassium chloride, so that the potassium chloride particles and the sodium chloride particles can be rapidly distinguished, and a great amount of work for grinding a sheet and judging the potassium chloride and the sodium chloride according to the difference of the refractive index when the coarse potassium chloride and the coarse sodium chloride are distinguished in the identification of a phase can be avoided.

The invention discloses a method for preparing a nano-micron autolysis temporary plugging diverter. The method comprises the following steps: at the room temperature, weighing a certain quantity of water, adding an iron ion stabilizer, a clay stabilizer, a cleanup additive and a high-temperature corrosion inhibitor into the water, performing stirring to obtain a mixed liquid I; continuously addinga dispersant into the mixed liquid I, performing stirring, then adding a suspending agent and sodium chloride, and performing stirring for 3-10 min to obtain a mixed liquid II; and weighing concentrated hydrochloric acid, adding the weighed concentrated hydrochloric acid into the mixed liquid II, and performing continuous stirring for 10-30 min to obtain a suspension out of which sodium chlorideparticles are separated. The formed diverter is a sodium chloride particulate substance with the grain size smaller than 3 [mu]m, and can deeply enter a reservoir to temporarily plug a high-permeability layer and seams. Along with ending of acidizing construction, sodium chloride particles which play a temporary plugging role are dissolved into a residual acid liquid or formation water for unplugging. The method has the characteristics that an organic high-molecular compound is not contained, gluing linkage or gel breaking is not needed, self-unplugging is realized, little formation damage iscaused and the method is simple and is low in cost.

The invention relates to a porous artificial bone and a preparation method thereof. The porous artificial bone is in a honeycomb mesh shape and mainly formed by combination of PLGA and MgSr-TCP, wherein a mole ratio of Mg+Sr+Ca to P in the MgSr-TCP is 1.45-1.70, a mole fraction of Mg in the MgSr-TCP is 1%-20%, and a mole fraction of Sr is 0.5%-10%. The preparation method includes: preparing a MgSr-TCP honeycomb mesh framework by 3D (three-dimensional) printing, and putting in a negative form prepared by quick formation; mixing and vibrating nanoscale sodium chloride particles and slurry containing PLGA, pouring into the honeycomb mesh framework under a negative pressure, and performing freeze drying for 24h to remove a solvent; soaking in deionized water, changing the water per 6h, and drying in a drying machine after 24h. The porous artificial bone is excellent in hardness and toughness and is biomechanically optimized; local acidity can be effectively neutralized after PLGA degradation, inflammation is alleviated, strength of the artificial bone is improved, degradation of the artificial bone is promoted, and adhesion and proliferation of osteoblasts are facilitated; the preparation method is simple, the framework can be designed into different shapes to meet individual demands, and high flexibility and high intelligence are realized.

The invention discloses a grinding pad and a preparation method and application thereof. The grinding pad comprises a grinding layer, a transparent base plate, a first adhesive layer, an elastic layerand a second adhesive layer, wherein the grinding layer, the transparent base plate, the first adhesive layer, the elastic layer and the second adhesive layer are sequentially arranged from top to bottom; and the grinding layer is prepared from a diamond grinding material, a binding agent and an auxiliary material, wherein the auxiliary material contains sodium chloride particle powder. Accordingto the grinding pad and the preparation method and application thereof, a space three-dimensional disordered micropore structure formed by the sodium chloride powder is applied to the grinding pad, so that lubricating liquid more sufficiently permeates into the surface layer of the grinding pad to participate in grinding, a workpiece subjected to precise grinding obtains higher surface quality, and a transient dry grinding condition is avoided; and meanwhile, the particle surface of a resin abrasive curing layer of the grinding pad has great self-sharpening performance and toughness, good self-repairing effects during grinding, efficient and low-cost processing, high process controllability and environmental friendliness can be achieved, and high processing precision and high-quality workpiece surface are guaranteed.

The invention discloses an anti-skid deicing device for ice and snow covered pavement, and belongs to the field of road snow removal. According to the scheme, a water-soluble protection plate is melted through snow, a power source is switched on to enable an electric heating net to emit heat, the heat is transmitted to a temperature control expansion ring through a main heat conduction wire to enable the temperature control expansion ring to rapidly expand, after the temperature control expansion ring expands, anti-skid fibers are extruded out of an anti-skid rod, and the friction force on the surface of the anti-skid rod is increased. The power source is switched on, and an electromagnetic net is started, so that metal parts on the vehicle are attracted by magnetism generated by the electromagnetic net, and the running speed of the vehicle is conveniently and slowly reduced. A hollow buffer ball in a buffer layer reduces the pressure on the electromagnetic net when the vehicle is running, snow on a road melts an intercepting net and enters a mounting hole to be mixed with sodium chloride particles to generate saline water, the heat generated by the electric heating net is transmitted to an expansion air bag through an auxiliary heat conduction wire, the expansion air bag expands when heated and ejects the sodium chloride particles out of the saline water to the road surface to melt the snow, and the road icing phenomenon is effectively reduced.