74results about How to "Shorten crosslinking time" patented technology

The invention discloses a preparation method of crosslinkable polyethylene cable material, which includes the steps and the following components are represented in proportion by weight: throwing polyethylene 75-95 proportion by weight, ethylene-vinyl acetate copolymer 0-20 proportion by weight, unsaturated silicone hydride 1.0-5 proportion by weight, free radical evocating agent 0.1-0.5 proportion by weight, organotin catalyst 0.1-1 proportion by weight, organic acid compound 0.1-1 proportion by weight, anti-oxidant 0.1-0.5 proportion by weight, anti-copper agent 0.1-0.5 proportion by weight, and lubricant 0.5-2 proportion by weight into the high speed mixing machine with rotary speed at 80-120 rpm for mixing 15-25 minutes, and then adding the mixture into the double-screw extruder, melting and prilling for obtaining crosslinkable polyethylene cable material. The method provided by the invention mixes all the material and dispersing uniformly, and then executes grafting reaction, thereby realizing more uniform grafting reaction and guaranteeing homogeneity of the crosslinking process, in addition, the invention uses organic acid compound which remarkably improves catalysis function of organotin catalyst, and improves crosslinking speed of silicone hydride, and overcomes the defect that the conventional silicone hydride crosslinked plastic can be linked only in warm water or steam environment with long time cooking, thereby saving production cost for manufacturer considerably. The crosslinkable polyethylene cable material obtained according to the invention is extruded by plastic cable extrusion machine unit for obtaining cable insulation layer, and is placed under the condition of 23 DEG C. with 50% humidity for one day naturally, then the crosslinking process is finished, moreover the product can pass performance indexes of hot extension performance test, dynamics test and aging characteristic test according to the national standard request.

The invention relates to a low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature and a preparation method of the cable material. The method is characterized by comprising the steps as follows: firstly, a twin-screw mixing extruder is used for mixing polyolefin elastomers and linear low-density polyethylene with part of unsaturated silane and part of a grafting initiator respectively and extruding the mixtures into particles; then a high-speed mixer is used for mixing the two kinds of prepared particles with ethylene-vinyl acetate copolymer resin, functional polyolefin resin, a flame retardant, an antioxidant and a processing aid; and finally, the twin-screw mixing extruder is used for extruding the mixture into particles, so that the low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature is obtained. The cable material is high in silane grafting rate and high in crosslinking activity, crosslinking can be directly performed at the room temperature when the cable material is prepared into wires and cables, time-consuming and energy-consuming procedures such as water boiling, sauna and the like can be avoided, a crosslinking method is simple and easy to implement, and more than half of the crosslinking time can be saved even when a water boiling or steam sauna crosslinking method is adopted. The cable material is low in cost, high in production efficiency, easy to operate and free from structural limits when being used for producing the wires and the cables, and the product performance is stable and reliable after crosslinking.

The invention discloses high-temperature hyper-salinity water-base fracturing fluid consisting of thickening liquid, a cross-linking agent and a gel breaker, wherein the thickening liquid comprises the following components in percentage by weight: 0.4-0.7% of a thickening agent, 0.1-0.8% of a cleanup additive, 0.01-0.1% of a sterilizing agent, 0.1-0.3% of a temperature stabilizing agent, and the balance of hyper-salinity seawater or stratum produced water; the thickening agent is sulfonyl hydroxypropyl guar gum, sulfonyl betaine amphoteric guar gum or sulfonyl carboxymethyl guar gum; the cross-linking agent is a stable complex formed from reaction of 9-18% of a zirconium compound, 3-40% of a boron compound, 9-18% of a chelating ligand and 5-19% of a bridging ligand by mass; the gel breaker is either ammonium persulfate or sodium persulfate. The fracturing fluid is directly prepared from hyper-salinity water and realizes effective utilization of seawater and hyper-salinity produced water from land, and is applicable to seaborne and terrestrial high-temperature oil-gas wells.

The invention relates to a carboxymethyl chitosan microsphere embolization agent. The embolization agent takes carboxymethyl chitosan as raw materials; the carboxymethyl chitosan is subjected to pretreatment, emulsification, cross-linking and dehydration drying to prepare microspheres with three-dimensional network structures. After the microspheres absorb water, the microspheres are smooth in surface and are rich in elasticity, have good biocompatibility and biodegradablity and is suitable for non-permanent vascular embolization.

The invention discloses a ground crosslinked acid crosslinking agent and a preparation method thereof. The crosslinking agent comprises 5-20% of zirconium oxychloride, 10-50% of a low molecular alcohol, 5-25% of alpha-hydroxy carboxylic acid, 5-25% of a polyol, 0.1-2.0% of a polyhydroxy carboxylate and the balance of water. The preparation method comprises dissolving the 5-20% of zirconium oxychloride in the balance of water, adding the low molecular alcohol, letting in nitrogen, heating up to 50-60 DEG C, reacting for 1.5h-2h, stopping nitrogen, adding the 5-25% of alpha-hydroxy carboxylic acid, the 5-25% of polyol and the 0.1-2% of polyhydroxy carboxylate, continuing to react for 1.5h-2h at 50-55 DEG C, neutralizing a reaction product to pH for 3-5 to obtain the crosslinking agent. The crosslinking agent can crosslink acrylamide polymers in an acid liquid with a high concentration to obtain acid containing gel with high viscosity, and is especially suitable for oilfield reservoir acid fracturing of 100-150 DEG C.

The invention relates to high-density low-friction fracturing fluid. The high-density low-friction fracturing fluid is made of, by weight, 20-46.5% of weighting agent sodium nitrate, 0.4-0.6% of thickener hydroxypropyl guar gum, 0.4-1.0% of cleanup additive Gemini surfactant, 0.1-0.3% of pH (potential of hydrogen) modifier, 0.1-0.3% of bactericide lauryltrimethylammonium chloride or dodecyl dimethyl benzyl ammonium bromide, 0.5-1.0% of clay stabilizer quaternary ammonium salt, 0.5-1.0% of temperature stabilizer organic amine composite, and the balance water. Sodium nitrate is used for increasing weight, the density at the normal temperature can reach 1.35g / cm<3>, and the high-density low-friction fracturing fluid is long in delayed crosslinking time, low in friction, low in filter loss, high in high-temperature rheological property, and especially applicable to fracture modification of ultradeep compact reservoirs under unusual high pressure, wellhead construction pressure can be reduced remarkably. Further, the high-density low-friction fracturing fluid is applicable to massive popularization and application to mine fields, low in cost and low in stratum damage, and has wide market prospect.

The invention relates to an inorganic boron crosslinking agent and a preparation method thereof. Currently, a water-based fracturing fluid is generally used for carrying out reservoir reconstruction at home and abroad; a fracturing fluid system with borax as a crosslinking agent has poor temperature resistance and is just used for superficial-reservoir reconstruction; and the temperature resisting capacity of the fracturing fluid with an organic boron crosslinking agent is improved, however, the amount of a fracturing fluid gel breaker is large, gel breaking is difficult, and the permeability damage on a reservoir and a support crack is large relatively. The inorganic boron crosslinking agent comprises the following components in parts by weight: 200-350 parts of water, 100-200 parts of boric acid, 300-400 parts of xylitol, 150-200 parts of sodium hydroxide. The preparation method comprises the following steps: proportioning according to the amounts of the components, adding water in a reaction kettle, and adding boric acid until boric acid is fully dissolved; slowly adding xylitol under the condition of stirring; reacting for 60-90 minutes at the temperature of 40-50 DEG C; and then slowly adding sodium hydroxide until sodium hydroxide is completely dissolved so as to obtain the inorganic boron crosslinking agent. According to the invention, the temperature resistance of the fracturing fluid is improved through improving the pH value of the crosslinking agent; and the delay crosslinking time of the inorganic boron crosslinking agent is prolonged through adding polyol.

An organic light-emitting panel, a process for packaging an organic light-emitting panel and a coating apparatus applied thereto are described. A patterned desiccant with large surface area is formed on a cover plate by an ink-jet printing process. The process for packaging an organic light-emitting panel and the coating process are applied for reducing crosslinking time of the desiccant, increasing the surface area of the desiccant and enhancing the moisture absorption ability of the desiccant.

The invention discloses a polyurethane-acrylate cathodic electrophoretic coating material, a preparation method therefor and an application of the polyurethane-acrylate cathodic electrophoretic coating material. The coating material is prepared from the ingredients in percentage by mass: 8% to 17% of amine compound, 10% to 40% of polyisocyanate, 7% to 36% of polyester polyol compound, 0.1% to 0.6% of catalyst, 9.5% to 38% of hydroxyl-terminated vinyl compound, 2% to 7% of organic acid, 2% to 6% of photoinitiator and 0.01% to 1% of leveling agent. According to the method disclosed by the invention, the preparation process is simple, polyurethane acrylate resin further has a good emulsifying property, the cathodic electrophoretic emulsion coating material prepared from the resin has the characteristic of convenience in construction, and a coating film is low in moisture content, is insoluble in water, is free of sagging, is free of dripping and is free of a stripping phenomenon after the electrophoretic coating material is subjected to electrophoresis. According to the electrophoretic coating material disclosed by the invention, the coating film is very uniform and plump and is high in adhesive power, good in leveling property and good in chemical resistance, and the ornamental performance and corrosion resistance are improved.

The invention relates to a preparation method of a chitosan microsphere. The preparation method of the chitosan microsphere comprises the following concrete steps: causing an oil phase to flow at a certain flow rate in an oil phase pipeline; vertically injecting a chitosan aqueous phase into the oil phase pipeline from an aqueous phase pipeline at a low speed; separating the chitosan aqueous phase into liquid drops with uniform size by virtue of a shearing force of an oil phase fluid, wherein the liquid drops flow into a container filled with crosslinking agent emulsion along with an oil phase; crosslinking and solidifying to obtain microspheres while stirring; and separating and drying, so that the chitosan microsphere is obtained. The chitosan microsphere prepared by adopting the preparation method has the characteristics of small particle size and high uniformity, safety and effectiveness of embolism in an interventional therapy can be improved, clinical operability can be enhanced, the clinical safety accident rate can be reduced, excessive screening is not needed to be carried out on the chitosan microsphere product to remove microspheres which are not in target particle size, the production cost is reduced, and the production efficiency is improved.

The invention relates to chitosan microspheres. The microspheres are solid spheres which have smooth surface and uniform granularity and are formed by crosslinking of chitosan and a crosslinking agent, wherein the grain diameter of each microsphere is 50-1200 mu m, preferably 50-600mu m, and further preferably 150-300mu m; and the grain diameter difference is not more than 20 percent, and preferably not more than 10 percent. The microspheres provided by the invention have the characteristics of small grain diameters and high uniformity, and are capable of improving the safety effectiveness of embolism in interventional therapy, reinforcing the clinical operability, reducing the clinical safety accident rate and reducing the production cost.

The invention relates to a water-producing natural cross-linking low-smoke halogen-free and flame-retardant POE (polyolefin elastomer) and a preparation method thereof. The POE comprises the following components in parts by weight: 80-90 parts of POE, 10-20 parts of polyolefine, 20-30 parts of calcined argil, 0.5-1 part of antiager, 0.1-1 part of peroxide initiator, 2-5 parts of silicane cross-linking agent, 0.1-1 part of cross-linking assistant, 2-10 parts of water-producing agent, 0.5-1 part of coupling agent, 5-10 parts of lubricant, 30-50 parts of processing oil and 80-100 parts of flame retardant. With the adoption of the water-producing cross-linking low-smoke halogen-free and flame-retardant POE and the preparation method thereof, the technical problem that silicane cross-linking cannot be conducted by the POE prepared in the prior art is overcome, and a water-producing natural cross-linking POE material with more excellent performance can be prepared, cables or accessories with excellent production performance can be produced, and the technical problems of production flow and energy waste can be solved.

The invention discloses a low-viscosity perfusion adhesive for repairing a concrete crack and a preparation method thereof. The low-viscosity perfusion adhesive for repairing the concrete crack is prepared from a component A and a component B in a mass ratio of 100 to 3, wherein, in parts by mass, the component A is prepared from 100 parts of cardanol epoxy resin, 1.2 to 9.7 parts of ester thinner, 0.5 to 1 part of surfactant and 1 to 1.5 parts of antifoaming agent; the component B is prepared from 25 to 37 parts of compound amine curing agent, 1 to 3 parts of coupling agent and 1 to 2 parts of accelerant. The cardanol epoxy resin of the low-viscosity perfusion adhesive is low in room-temperature viscosity; as the cardanol has a low-temperature-resistant characteristic, the cardanol epoxyresin is slightly influenced in viscosity by a temperature change, and is particularly suitable to use in a low-temperature environment; the excellent flexible performance is provided for the epoxy resin by the longer carbon chain of the cardanol; when a seam injection adhesive is confected, a flexibilizer can be allowed not to be extra added any more; in addition, a synthetic raw material cashewnut shell liquid of the low-viscosity perfusion adhesive is a potential renewable resource, and the production cost is enabled to tend to cheapness.

The invention relates to a use method of a fixed-point gel-placing water shutoff profile control agent, which is applied to water shutoff profile control of oil field flooding. The use method comprises the following steps of: step 1, pumping tracer suspension liquid to a water well via a cement truck, and timing, setting a terminal point of each section as a destination point, and ordering the destination points in sequence; step 2, calculating the time of the fixed-point gel-placing water shutoff profile control agent expected to reach each destination point, respectively; regulating the mass ratio of components of the fixed-point gel-placing water shutoff profile control agent according to the delay crosslinking time corresponding to the fixed-point gel-placing water shutoff profile control agent; and establishing the fixed-point gel-placing water shutoff profile control agent corresponding to the delay crosslinking time; and step 3, injecting the fixed-point gel-placing water shutoff profile control agent to the water well by using an electric pump; sequentially and continuously injecting to each destination point; closing the water well to complete the process of injecting the fixed-point gel-placing water shutoff profile control agent to the water well. The use method of the fixed-point gel-placing water shutoff profile control agent has the following effects: the water shutoff profile control can be better implemented, the measurement effect is guaranteed, the well is not needed to close for a long period of time, and the construction period of the water shutoff profile control is shortened.

The invention provides a weighted fracturing fluid. The weighted fracturing fluid is a liquid system prepared by using the following raw materials, by weight, 29-70.5 parts of a weighting agent, 0.2-0.8 parts of a vegetable glue thickener, 0.1-0.8 parts of a cleanup additive, 0.02-0.15 parts of a bactericide, 0.05-0.3 parts of a pH value adjusting agent, 0.1-0.7 parts of a cross-linking agent, 0.03-0.2 parts of a gel breaker and 29.5-71 parts of water. The density of the fracturing fluid at room temperature is 1.22-1.62g / cm<3> or more; the temperature resistance capability of the fracturing fluid can reach above 200DEG C; and the fracturing fluid has the characteristics of cross-linking delaying, low frictional resistance, good cross-linking performance, strong temperature and shear resistance, low filter loss, thorough gel breaking, low residue content, good expansion resistance and the like.

The invention discloses a novel preparation method of an organosilane crosslinked polyethylene cable material, which comprises the following steps: adding polyethylene, an initiator and a grafting agent into a kneading machine, and kneading for 5-10 min, so that a grafted masterbatch is obtained; adding low-density polyethylene, a catalyst and an antioxidant into the kneading machine, and kneading for 3-8 min, so that a catalyst masterbatch is obtained; mixing the grafted masterbatch with the catalyst masterbatch, and extruding and granulating the obtained mixture so as to obtain an organosilane crosslinked polyethylene cable masterbatch; and putting the organosilane crosslinked polyethylene cable masterbatch into a confined space in which a moderate amount of water is added, putting the confined space to illuminate in the sunlight in the daytime, and 2-7 days later, drying the obtained object, so that the organosilane crosslinked polyethylene cable material is obtained. The preparation method of an organosilane crosslinked polyethylene cable material provided by the invention is simple in operation and low in cost, and can achieve over 80% of crosslinking.

The invention relates to a preparation method of epispastic material employing electron beam radiation crosslinking and compositions thereof; when the epispastic material is applied, foaming agent is added at the moment of mixing one thermoplastic high molecular compound and at least one thermoset rubber, the foaming agent is ensured to be homodispersed fully in the crosslinked polymer and then the crosslinking is carried out by electron beam irradiation. After foaming, the foaming is even and good, the crosslinking density is increased and the crosslinking time is reduced.

The invention relates to the technical field of organosilicon and provides a preparation method of polycarbosilane in order to solve the problems in polycarbosilane preparation at present. The preparation method is characterized by taking chloromethyl chlorosilane as a raw material, synthesizing a polycarbosilane intermediate in an organic solvent and then preparing the polycarbosilane by using a reducing agent. The preparation method provided by the invention has the advantages that the operation is convenient, and the time is shortened; meanwhile, the number-average molecular weight of the prepared polycarbosilane is higher, and the demands of preparing an organic functional material can be met.

The invention discloses a preparation method of in-situ cross-linked collagen fiber. The preparation method comprises following steps: 1, EDC and NHS are mixed at a certain mass ratio, an obtained mixture is dissolved in 0.5mol / L glacial acetic acid as a crosslinking agent (wherein the mass amount of EDC accounts for 1 to 20% of that of collagen) so as to obtain a glacial acetic acid solution containing the crosslinking agent; 2, collagen is dissolved in the glacial acetic acid solution containing the crosslinking agent, mechanical stirring is adopted for full stirring, in dissolving process,the temperature of the solution is maintained at 4 to 6 DEG C, and at last a collagen solution with a mass concentration of 1.5% is prepared; 3, the collagen solution is subjected to freezing centrifugation defoaming for 40min at 4 DEG C so as to obtain a collagen spinning stock solution, wet method spinning is adopted, syringe pump extrusion speed is controlled to be 0.5ml / min, the stay time of obtained nascent fiber in a coagulation bath is controlled to be 100 to 300s so as to obtain collagen fiber, the gel state collagen fiber discharged from coagulation bath is loaded with 5g counterweight and is subjected to suspension treatment, and after 1h of natural airing, collagen fiber is obtained. According to the preparation method, introduction of EDC / NHS is capable of improving collagen fiber crystallization degree, in-situ crosslinking is capable of shortening the crosslinking time of collagen fiber, and improving forming technical conditions. The tensile strength of the collagen fiber prepared using the preparation method ranges from 1.06 to 1.43cN / dTex.

The invention belongs to the technical field of oil field acidizing and fracturing, particularly relates to a preparation method of composite ground crosslinking acid controllable in crosslinking time, mainly aims to overcome the shortcoming that an existing crosslinking acid liquid system is not controllable in crosslinking time and provide a compound acid liquid system controllable in crosslinking time and resistant to temperature and a preparation method thereof. The shortcomings of underground crosslinking and uncontrollable crosslinking time of the acid liquid system existing under conventional acid pressure are overcome. A cross-linking agent and a cross-linking conditioning agent different in property are mainly utilized, the cross-linking time of the acid liquid system is controlled by adjusting proportion. In addition, organic resin is introduced in the system, so that the temperature resistance of the acid liquid system is improved.

A preparation method of hollow-fiber solvent-resisting nanofiltration membranes includes step 1, preparing solvents; step 2, filtering and defoaming spinning solutions, removing the spinning solutionsto spinning solution bottles, extruding the spinning solutions and core liquid from spinning nozzles after standing to form nascent-state membranes, and allowing the nascent-state membranes to entergel bath through air gaps at a certain distance to achieve curing and film formation; step 3, sufficiently rinsing the cured hollow-fiber membranes in deionized water for a certain time, soaking the hollow-fiber membranes in activation reagents at a certain temperature for a certain time, soaking the solvent-activated hollow-fiber membranes in glycerin liquors for a certain time, and drying the hollow-fiber membranes in the air before storing. The preparation method has the advantages that hollow-fiber membrane filaments are subjected to bisynchronous crosslinking before curing by crosslinkingagents in the core liquid and the gel bath, crosslinking reaction speeds of the crosslinking agents are increased effectively, the solvent-resisting hollow-fiber nanofiltration membranes can be produced in a large scale, and accordingly, the preparation method has wide application prospect in the field of organic solvent system separation.

The invention provides a compound cellulose indepth water shutoff modifying and flooding agent for oil production and a preparation method of the compound cellulose indepth water shutoff modifying and flooding agent. The preparation method is characterized in that compound cellulose serves as the raw material for preparing a compound gel type indepth water shutoff profile control agent; the field application result shows that a product synthesized by the agent has the characteristics of causing little damage, being temperature resistant and delaying crosslinking time; the product can be automatically repaired after being broken during percolation, so that injected water can be greatly prevented from flowing all around between pre-crosslinked particles, and as a result, the temperature resisting and salt resisting effects are realized; compound cellulose indepth water shutoff modifying and flooding agent for oil production is prepared from the components of cellulose, 1-butyl-3-methylimidazolium, a phenolic aldehyde crosslinking agent, additives and a surface active agent.

The invention relates to the technical field of paint preparation, in particular to waterborne paint for car chassis protection and a preparation method thereof. The waterborne paint comprises water-soluble epoxy acrylic resin, polyacrylate emulsion, zinc isoocatanoate, sodium alginate, hexamethylene diisocyanate, nano silicon carbide, talcum powder, hydroxyethyl methacrylate phosphate, tourmalinepowder, anion powder, antirust pigment, a dispersing agent, a film forming agent, a levelling agent, a defoaming agent and deionized water. The waterborne paint and the preparation method thereof have the advantages that the prepared paint is good in corrosion resistance; the hydroxyethyl methacrylate phosphate, the epoxy acrylic resin and the hexamethylene diisocyanate are allowed to have crosslinking reaction under the effect of potassium persulfate to generate a stable three-dimensional network structure, the hydroxyethyl methacrylate phosphate, the epoxy acrylic resin and the hexamethylene diisocyanate are connected through covalent bonds, the adhesive force of the paint to metal is evidently enhanced by grafting the hydroxyethyl methacrylate phosphate, and paint film falling off canbe reduced.

An organic light-emitting panel, a process for packaging an organic light-emitting panel and a coating apparatus applied thereto are described. A patterned desiccant with large surface area is formed on a cover plate by an ink-jet printing process. The process for packaging an organic light-emitting panel and the coating process are applied for reducing crosslinking time of the desiccant, increasing the surface area of the desiccant and enhancing the moisture absorption ability of the desiccant.

The invention relates to high-density low-friction fracturing fluid. The high-density low-friction fracturing fluid is made of, by weight, 20-46.5% of weighting agent sodium nitrate, 0.4-0.6% of thickener hydroxypropyl guar gum, 0.4-1.0% of cleanup additive Gemini surfactant, 0.1-0.3% of pH (potential of hydrogen) modifier, 0.1-0.3% of bactericide lauryltrimethylammonium chloride or dodecyl dimethyl benzyl ammonium bromide, 0.5-1.0% of clay stabilizer quaternary ammonium salt, 0.5-1.0% of temperature stabilizer organic amine composite, and the balance water. Sodium nitrate is used for increasing weight, the density at the normal temperature can reach 1.35g / cm<3>, and the high-density low-friction fracturing fluid is long in delayed crosslinking time, low in friction, low in filter loss, high in high-temperature rheological property, and especially applicable to fracture modification of ultradeep compact reservoirs under unusual high pressure, wellhead construction pressure can be reduced remarkably. Further, the high-density low-friction fracturing fluid is applicable to massive popularization and application to mine fields, low in cost and low in stratum damage, and has wide market prospect.

The invention discloses an oil removal and heavy metal removal modified walnut shell filter material and a preparation method thereof; the surface of the oil removal and heavy metal removal modified walnut shell filter material is provided with an oxidized graphene coating. The preparation method of the filter material includes the steps that walnut shell powder and oxidized graphene powder are added into a V-shaped mixer simultaneously to be stirred and mixed uniformly, then a cross-linking agent and deionized water are added, cross linking is conducted at the temperature of 50-80 DEG C for 3-3.5 hours, after the liquid phase is filtered out, absolute ethyl alcohol is washed to be neutral, drying is conducted for 1-3 hours at the temperature of 100-140 DEG C, finally a vibration screen is utilized to screen out the filter material with the particle size meeting the requirement, and a finished product is obtained. By means of the filter material, grease and heavy metal in sewage water can be removed simultaneously, the sewage treatment process is greatly simplified, sewage treatment cost is lowered, sewage treatment efficiency is high, the filter material is high in hardness, resistant to wear, good in pressing resistance, not prone to caking, large in toughness, easy to regenerate, long in replacement cycle and low in cost.

The invention relates to an organic steam corrosion-resistant gas separation film and a preparation method thereof. A polyvinylidene fluoride-hexafluoropropene (PVDF-HFP) copolymer is used as a base film material, a micromolecule PEG-macromolecule PEG mixed additive is used, an alcohol-water dual coagulation bath is used, a film is formed on a polyester non-woven fabric through blade coating and a PVDF-HFP porous base film is prepared through a delayed phase inversion method. Ternary copolymer block silicone oil is dissolved in the organic solvent, the solution undergoes a crosslinking reaction under action of a catalyst and a crosslinking agent until a certain crosslinking degree, the surface of the PVDF-HFP porous base film is coated with the product by a blade and the coating is cured and molded at a high temperature so that a compounded layer is formed. The PVDF-HFP porous base film and the compounded layer have strong organic steam corrosion resistance and are bonded tightly. The organic steam corrosion-resistant gas separation film has excellent comprehensive properties and a very great industrial application prospect.

A novel aluminium cross-linking agent for a low-carbon hydrocarbon waterless fracturing fluid, a preparing method thereof and applications of the cross-linking agent are provided. The aluminium cross-linking agent comprises 20-27 parts by mass of a main agent, 3-7 parts by mass of a cross-linking accelerant and 45-60 parts by mass of water. The preparing method includes adding the water of a certain ratio into a reaction container, adding the main agent, reacting under fully stirring, adding the cross-linking accelerant and reacting under stirring for 15 min. The cross-linking agent is high in crosslinking speed with a gelatinizing agent, stable in gel formation, simple and convenient to prepare and low in cost, and a fracturing fluid system has high resistance to temperatures and shearing and good effects on unconventional high-temperature reservoir stratum fracturing.

The invention discloses a two-step method silane natural crosslinking overhead polyethylene insulation material and a preparation method thereof, wherein the two-step method silane natural crosslinking overhead polyethylene insulation material is prepared from the following raw materials in parts by weight: 85 to 95 parts of linear low density polyethylene, 50 to 60 parts of high density polyethylene, 2 to 6 parts of polypropylene, 10 to 15 parts of aluminum hydroxide, 1 to 3 parts of silane crosslinking agents, 0.5 to 2 parts of organic auxiliary agents, 1 to 2 parts of rheological agents, 1to 3 parts of complex antioxidants, 0.3 to 1 part of catalysts, 1 to 3 parts of copper ion inhibitors and 0.2 to 0.5 part of processing auxiliary agents. The produced insulation material achieves thegoals of effectively reducing the silane crosslinking time, reducing the energy consumption for cable plants, reducing the cost and effectively improving the production efficiency.

The invention discloses a medical dressing and a preparation method thereof. The medical dressing comprises a bacterial cellulose membrane, water-soluble chitosan, sodium alginate, hydroxyethyl methacrylate and a compound cross-linking agent. The preparation method comprises the following steps: adding sodium alginate into deionized water; heating, stirring and uniformly mixing; then adding water-soluble chitosan; stirring for dissolution; adding the bacterial cellulose membrane; heating till reaction is finished; then adding the compound cross-linking agent to obtain the medical dressing after cross-linking reaction. Through adoption of the preparation method, the preparation efficiency is improved, and the prepared medical dressing has favorable hemostasis and wound surface healing promotion performance.