53results about How to "Few branches" patented technology

Less branched C9 alcohols are used to provide plasticizer esters particularly suitable for high temperature applications such as wire and cable insulation.

The invention provides flame retardant rubber and a preparation method thereof. The flame retardant rubber is obtained by milling and vulcanizing a mixture containing ethylene-propylene-diene monomer raw rubber, modified polybutadiene, a vulcanizing agent and a hydroxide flame retardant. The modified polybutadiene is isocyanate terminated polybutadiene and / or maleated polybutadiene. The flame retardant rubber has good flame retardant property and excellent mechanical performance.

Less branched C10 alcohols are used to provide plasticizer esters particularly suitable for high temperature applications such as wire and cable insulation.

A preparation method for high molecular weight cationic polyacrylamide includes following steps: uniformly mixing acrylamide, acryloyloxyethyl trimethylammonium chloride and deionized water to obtain homogeneous solution, then sequentially adding complexant and defoamer, stirring well until the solution is clear and adjusting the pH value with weak acids to obtain homopolymerized solution; pumping the homopolymerized solution into a polymerizer after cooling, adding azodiisobutyronitrile, feeding high-purity nitrogen, sequentially adding solutions respectively prepared by oxidant, azo-oxidant, reductant and auxiliary reductant, continuing to feed high-purity nitrogen and stopping after all the solutions are added, and controlling the temperature for polymerization reaction and aging reaction for hours to obtain transparent elastic rubber brick; and taking out the rubber brick, cutting, pelleting, drying, smashing and screening to obtain white powdery cationic polyacrylamide. The high molecular weight cationic polyacrylamide prepared by the method can be widely applicable to fields of organic wastewater treatment, papermaking auxiliaries and dispersant, oil field auxiliaries and the like.

Provided are a carboxyl group-containing polyimide and a prepolymer thereof, and the carboxyl group-containing polyimide can provide a cured product that simultaneously exhibits heat curing properties, PCT resistance, solvent resistance and peel strength. The present invention relates to an imide prepolymer containing a terminal acid anhydride group and characterized by being obtained by reacting an acid anhydride group in a tetracarboxylic dianhydride with an isocyanate group in a diisocyanate compound. The present invention also relates to the carboxyl group-containing polyimide characterized by having a structure in which the aforementioned imide prepolymer containing a terminal acid anhydride group undergoes chain extension via a polyol compound. Furthermore, the present invention relates to a heat-curable resin composition and a flexible metal-clad laminate that use the carboxyl group-containing polyimide.

The invention relates to a hot-melt pressure-sensitive adhesive, in particular to a modified hot-melt pressure-sensitive adhesive and a preparation method thereof. The modified hot-melt pressure-sensitive adhesive comprises the following components: a styrene thermoplastic elastomer, petroleum resin, Fischer-Tropsch wax, pentaerythritol ester, a main antioxidant, an auxiliary antioxidant and a softener; wherein the styrene thermoplastic elastomer is of an SIS linear structure, the content of styrene is 15%-21%, and the content of diblock is 50%-75%. The C5 petroleum resin and the pentaerythritol ester are dissolved in both the rubber phase (polyisoprene phase) and the hardness phase (polystyrene phase) of the thermoplastic elastomer. The two tackifying resins act together to improve the compatibility of the hot melt pressure sensitive adhesive. The raw materials cooperate with each other to obtain the hot melt pressure sensitive adhesive which has good fluidity, meets the use requirements of adhesive force, does not increase peel strength with time, and can be peeled off from the substrate cleanly.

The invention relates to a four-branch-chain six-degree-of-freedom series-parallel mechanism. The four-branch-chain six-degree-of-freedom series-parallel mechanism comprises a fixed platform, slidingguide rails arranged on the fixed platform, two sliding blocks, a movable platform and four linear driving branch chains connected with the movable platform, the first sliding block and the second sliding block; the movable platform is square, and the first sliding block and the second sliding block are identical in structure and shape and are L-shaped; the first linear driving branch chain and the third linear driving branch chain in the four linear driving branch chains are identical in structure, and the second linear driving branch chain and the fourth linear driving branch chain are identical in structure; and the movable platform can realize six degrees of freedom, the four linear driving branch chains coordinately drive to achieve two movements and two rotational degrees of freedom,and the first sliding block and the second sliding block coordinately drive to achieve the other movement and rotational degrees of freedom. The four-branch-chain six-degree-of-freedom series-parallel mechanism has few branch chains, simple structure, simple kinematic model, high motion decoupling property, large working space, high carrying capacity and high application prospect.

The present invention provides a process for preparing a fluorine-containing elastomer in a high productivity comparable to that of non-iodine transfer polymerization process by carrying out an iodine transfer polymerization at high pressure. The present invention also provides a fluorine-containing elastomer prepared by this process, and fluorine-containing molded articles. The process is a batch copolymerization process conducted under conditions that the reduced temperature of the critical constant is at least 0.95 and the reduced pressure of the critical constant is at least 0.80 wherein the reduced temperature and the reduced pressure are calculated using the Peng-Robinson formula from the critical temperature, the critical pressure and the composition ratio of each of the monomers in the gaseous phase in a reaction vessel, in which ethylenically unsaturated compounds containing at least one fluoroolefine are copolymerized in the presence of a compound having the formula: Rf<1>.Ix wherein Rf<1> is a saturated or unsaturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, and x is the number of bonds of Rf<1> and an integer of 1 to 4.

The invention relates to a pre-mixing process in a process for producing rare-earth isoprene rubber through isoprene solution polymerization by using a rare-earth catalyst. The pre-mixing process is characterized by comprising the following steps of: pre-mixing the rare-earth catalyst, an isoprene monomer and a solvent in a pre-mixing device consisting of a pipeline high-speed mixer and a pre-mixing kettle (14), and then injecting the mixture into a polymerization kettle. Aiming at the problems of poor dispersion of the catalyst, the monomer and the solvent during the isoprene solution polymerization, the process realizes efficient pre-mixing reaction of the rare-earth isoprene rubber. The rare-earth isoprene rubber can be widely applied to tyres and other rubber products, can be mixed with other rubbers, is particularly suitable for food and medicament industries such as artificial respiratory organs and the like, and is more suitable on the sanitation aspect compared with natural rubber and titanium rubber.

The invention discloses a preparation method for a modified cation retention and filter aid, which comprises the following steps raw materials are mixed uniformly to obtain a homogeneous solution; a complexing agent and a defoaming agent are added sequentially; sufficient stirring is performed until the solution is clear; the pH value is adjusted via weak acid to obtain a homopolymerization solution; the homopolymerization solution is cooled and then pumped into a polymerization kettle; azodiisobutyronitrile is added; high-purity nitrogen is introduced; the solutions prepared by the raw materials are added sequentially; after the solutions are added fully, high-purity nitrogen is introduced continuously; then feeding is stopped; the temperature is controlled for polymerization reaction; aging reaction is performed for 4 h; a transparent elastic rubber block is obtained; the rubber block is taken out, cut, granulated, dried, smashed and sieved to obtain white powdery cation polyacrylamide According to the method, the obtained modified cation polyacrylamide can be widely applied to a paper technology, improve the dehydration property of pulp, increase retention rates of a fine fiber and a filler, and reduce consumption of the raw materials and environment pollution.

The invention provides a three-link-parallel-connection external fixator for tibia malformation correction. The three-link-parallel-connection external fixator comprises a proximal ring, a distal ring, a proximal-ring connection base, hooke hinges, three adjustment branch links, first adjustment assemblies, second adjustment assemblies, kirschner wires and kirschner wire clamps. The proximal ringand the distal ring of the external fixator are perpendicularly fixed to the deformed tibia through the kirschner wires respectively. The adjustment branch links are composed of the first adjustment assemblies and the second adjustment assemblies, and the first adjustment assemblies and the second adjustment assemblies are provided with adjustment nuts, the adjustment branch links can be extendedor shortened by rotating the first adjustment nut and the second adjustment nut, the distal ring can conduct spatial 6-DOF movement relative to the proximal ring accordingly, and any-space three-dimensional bone malformation can be corrected. According to the three-link-parallel-connection external fixator, three-link design is adopted to form a 3-PUPU parallel connection structure with 6-DOF, andthe three-link-parallel-connection external fixator has the advantages of being simple in structure, small in motion branch link number, large in working space, convenient to operate and not prone tobranch link interference.

The invention discloses a GIT branch management method and device. The method comprises the steps that a modification command input by the exterior is received and analyzed, so that a corresponding modification instruction and a corresponding modification type are obtained; based on the modification type, auxiliary branches corresponding to the modification type are pulled from pre-created corresponding branches; the modification instruction is executed through the auxiliary branches, and the auxiliary branches are deleted after execution of the modification instruction is completed. The modification instruction and the modification type are obtained according to the input modification command, then the auxiliary branches are pulled from the corresponding branches according to the modification type, the modification instruction is completed through the auxiliary branches, and the auxiliary branches are deleted after the instruction is completed; therefore, the number of the total branches is extremely small, a developer clarifies the relationship among the branches conveniently, and the working efficiency of the developer can be improved.

The invention relates to a power-up / power-down reset circuit and a chip. The circuit comprises a starting resistance circuit, a PMOS tube M1, a PMOS tube M2, an NOMS tube M3 and an NMOS tube M4; the starting resistance circuit is connected between a power supply and the ground, and comprises a first resistance voltage-dividing module, a second resistance voltage-dividing module, a third resistance voltage-dividing module and a fourth resistance voltage-dividing module; a first metal pole of M1 and a first metal pole of M2 are respectively connected to the power supply; a second metal pole of M1 and a grid electrode of M2 are connected with a second metal pole of the first resistance voltage-dividing module; a grid electrode of M1 is connected with a second metal pole of the second resistance voltage-dividing module; a second metal pole of M2 is connected with a first metal pole of M3; a first metal pole of M3 is connected with a grid electrode of M3 and then connected with a grid electrode of M4; a first metal pole of M4 is connected with a second metal pole of the third resistance voltage-dividing module; and a second metal pole of the fourth resistance voltage-dividing module, a second metal pole of M3 and the second metal pole of the tube M4 are connected to the ground.

The invention discloses a plane two-freedom-degree parallel mechanism containing a coupled branch chain. The mechanism comprises six connecting rods and three sliding blocks; the first connecting rod is a fixed connecting rod, the fourth connecting rod is a tail end executor, one end of the first connecting rod is connected with one end of the second connecting rod, the other end of the first connecting rod is provided with a first sliding block, the other end of the second connecting rod is connected with one end of the third connecting rod, the other end of the third connecting rod is connected with one end of the fourth connecting rod, the other end of the fourth connecting rod is provided with a second sliding block, one end of the fifth connecting rod is connected with the second sliding block, the other end of the fifth connecting rod is connected with the middle of the first connecting rod, one end of the sixth connecting rod is connected with the middle of the fourth connecting rod, the other end of the sixth connecting rod is connected with the first sliding block, a third sliding block is arranged at the central position of the fifth connecting rod or the sixth connecting rod, and the middle of the fifth connecting rod or the sixth connecting rod is connected with the third sliding block. Different moving pairs can be selected as moving input, lifting and tipping motions of the tail end executor can be achieved, and the application range is wide.

The invention discloses a metal complex, a preparation method thereof and a preparation method of olefin binary copolymer. The metal complex is as shown in formula (D), wherein M represents transition metal from the IV B group to the VII B group or of the VIII group; R3 represents hydrogen or C1-20 alkyl optionally containing heteroatoms; L1 represents a ligand coordinated with M; X1 represents oxygen or sulfur; E1 and E2 independently represent nitrogen, phosphorus, arsenic or antimony; each R4 independently represents hydrogen or C1-20 alkyl optionally containing heteroatoms, and at least one R4 is alkyl with at least two groups containing the heteroatoms. The invention further provides application of the metal complex to olefin polymerization. When the metal complex is used as the catalyst, polymer with high molecular weight and few linear chains can be obtained.

The invention belongs to the technical field of oil field stimulation, and particularly relates to a slick water fracturing fluid for medium-high temperature compact reservoirs and a preparation method thereof. The slick water fracturing fluid comprises the following components in percentage by weight: 0.30 to 0.45 percent of a thickening agent, 0.03 to 0.05 percent of a clay stabilizer, 0.20 to 0.50 percent of a structural stabilizer, 0.01 to 0.05 percent of a strength maintaining agent, 0.04 to 0.10 percent of a temperature resistant regulator, 0.05 to 0.10 percent of a gel breaker degradingagent and the balance of water. The slick water fracturing fluid has fast dissolution. In 30 seconds, 80% of the final viscosity increase can be achieved, the drag reduction rate can reach more than80%, the core damage rate is less than 10%, well temperature resistance and shear resistance can be satisfied under the medium and high temperature conditions of 90 deg c to 180 deg c, the sand carrying concentration can meet the construction requirements of more than 750 kg / m<3>, the gel breaking is complete, the drainage rate can reach more than 40%, and after simple sand settling treatment, theslick water fracturing fluid can be reused for more than 20 times to maintain more than 90% of the original performance.

The invention discloses a lignin pretreatment method for preparing carbon fibers, comprising the following steps: (1) degrading the lignin with biological enzymes; (2) adding alkali to the degraded lignin for reaction, After the reaction is completed, an oxidizing agent is added for oxidation treatment; (3) Organic acid is added to the oxidized lignin for polymerization reaction, and the pretreated lignin is obtained after the reaction is completed; Methods The lignin molecular chain was adjusted so that the structural units in the lignin were arranged in an orderly manner, with less branched chains on the molecular chain and a stable structure, which had a positive effect on improving the mechanical properties, chemical stability and processability of carbon fibers.

The invention discloses a plant starch synthesis associated protein IbAATP and encoding genes and an application thereof. The plant starch synthesis associated protein IbAATP provided by the invention is (1), (2) or (3): (1) a protein of which an amino acid sequence is shown in a sequence 2 of a sequence table; (2) a fused protein obtained in a way that a label is connected to the N end or / and C end of the protein shown in the sequence 2 of the sequence table; (3) a plant starch synthesis associated protein obtained by the substitution and / or deletion and / or adding of the protein shown in (1) or (2) through one or several amino acid residues. Experiments show that the plant starch synthesis associated protein IbAATP and the encoding genes provided by the invention can increase the total content of plant starch and / or change the quality of the starch.

The invention relates to a reinforced modified poly(propylene carbonate) composition and a preparation method thereof, belonging to the field of modification of high polymer materials. The reinforced modified poly(propylene carbonate) composition comprises poly(propylene carbonate), ethylene-vinyl acetate copolymer and poly(1,2-propanediol adipate), wherein the weight ratio of the poly(propylene carbonate) to the ethylene-vinyl acetate copolymer to the poly(1,2-propanediol adipate) is (20-80):(20-80):(2-10). The reinforced modified poly(propylene carbonate) composition has higher tensile strength than the poly(propylene carbonate); the tensile strength can be up to 34.5 MPa; and the material has high tensile break extension percentage, flexibility and toughness and increases the anti-stick capability, thus ensuring that the poly(propylene carbonate) material has wider application space.

The invention relates to a cultivation and management method of packhams through plain net rack top grafting and variety changing. The method is characterized by comprising the following steps of S1, selection of stocks; S2, selection of scions; S3, treatment of the scions; S4, treatment of the stocks; S5, grafting; S6, racking and corner opening; S7, cultivation of bearing branches in the current year; S8, pruning management; S9, bearing management; S10, management in the third year. Compared with a traditional mode of not building a net rack, the cultivation and management method of the packhams through plain net rack top grafting and variety changing has the advantages that flower buds are easier to form, a large number of secondary branches are formed by adopting new shoots after corner opening, and the building mode is more conductive to management and picking, so that the management and picking process is safer and more efficient compared with a traditional mode; a net rack built for top grafting trees is more conductive to ventilation and light transmitting, so that the fruit quality is significantly improved; branches on the back of the packhams cultivated on a flat shed rack are few, shaping and pruning mainly comprise bud picking and branch thinning, the pruning workload is greatly reduced, the packhams bears fruits early, the yield is high, and the quality is good.

The invention provides diamond wire cutting liquid for a solar silicon wafer as well as a preparation method and application of the diamond wire cutting liquid. The diamond wire cutting liquid for the solar silicon wafer comprises the following components in parts by mass: 10-30 parts of a wetting agent; 15-35 parts of a penetrant; 20-50 parts of a lubricant; 10-0 parts of a sodium-containing compound; and 40-60 parts of pure water. The invention further discloses a preparation method of the diamond wire cutting liquid for the solar silicon wafer. According to the diamond wire cutting liquid, silicon powder in cutting gaps in the cutting process of large-size solar silicon wafers with the size of 182-210 mm can be effectively removed through the combined action of the wetting agent and the penetrant of specific components and compounding of the lubricant, the cutting efficiency is improved, the cutting abnormal rate and the smudginess rate are reduced. The diamond wire cutting liquid has good industrial application prospects and popularization potential in the technical field of solar silicon wafer diamond wire cutting.

The invention discloses a metal complex and a preparation method thereof and a preparation method of an olefin binary copolymer. The metal complex is represented by the following general formula (D): wherein, M represents Group IVB to VIIB in the periodic table of elements transition metals of Group VIII or Group VIII; R 3 represents hydrogen or a hydrocarbon group of 1 to 20 carbon atoms and optionally contains heteroatoms; L 1 Indicates the ligand coordinated to M; X 1 Indicates oxygen or sulfur; E 1 and E 2 independently represent nitrogen, phosphorus, arsenic or antimony; R 4 Each independently represents hydrogen or a hydrocarbon group having 1-20 carbon atoms and optionally containing heteroatoms, wherein at least one R 4 It is a hydrocarbon group having more than 2 heteroatom-containing groups; the present invention also provides a preparation method of the above-mentioned metal complex and its application in olefin polymerization, using the complex of the present invention as a catalyst, can obtain high molecular weight, less linear chain polymer.

The invention belongs to the field of road traffic design and provides a grade separation structure of an underground tunnel or an underwater tunnel. Opposite-direction lanes of a second road section are separated from each other. Respectively taking a first exit and entrance and a second exit and entrance, at two ends of the second road section, as starting points, a first ramp is arranged adjacent to a corresponding lane to the left of the first ramp lanes and a second ramp is arranged adjacent to a corresponding lane to the left of the second ramp lanes; after crossing over a first road section, the first ramp and the second ramp are connected to the first road section by corresponding arc ramps. Respectively taking a third exit and entrance and a fourth exit and entrance, at two ends of the first road section, as starting points, a third ramp is arranged adjacent to a corresponding lane to the left of the third ramp and a fourth ramp is arranged adjacent to a corresponding lane to the left of the fourth ramp; after crossing over a lane of the second road section, the third ramp and the fourth ramp are respectively communicated with an opposite-direction lane of the second road section by corresponding arc ramps. The grade separation structure of the urban underground tunnel or the urban underwater tunnel provided by the invention has the advantages of simple structure form, small quantity of road bifurcations (18 times of bifurcating), less overlapping layers, simple design and small construction excavation quantity.

The invention discloses an oil-resistant and heat-resistant insulating material as well as a preparation method and application thereof. The insulating material is prepared from the following raw materials: a styrene elastomer, polyethylene and metallocene polyolefin, wherein the mass content of styrene in the styrene elastomer is 8-20%. According to the invention, the styrene elastomer with low styrene content and the polyethylene are blended as the base material, the styrene elastomer and the polyethylene can be cross-linked under irradiation, and the cross-linking degree is obviously increased compared with the prior art, so that the mechanical strength, heat resistance, aging resistance and other properties of the insulating material are improved. The metallocene polyolefin can effectively adjust the hardness of the system and improve the toughness of the finished product. The metallocene polyolefin is short in branch chain, small in quantity and not involved in cross-linking reaction, the toughness of a finished product can be improved, meanwhile, adverse effects on the cross-linking reaction are avoided, the insulating material does not need to be added with mineral oil plasticizers, and therefore the insulating material has the advantages of being high in mechanical strength, resistant to heat, oil, aging and cracking, low in hardness and the like.

The invention provides a pear tree two-arm direct-motion type shed frame tree shape which comprises a tree trunk. The tree trunk has two boughs which grow in a direct-motion mode, and base angles of the two boughs are 45 degrees. When reaching a frame-climbing point, the boughs are fixed on a horizontal shed frame in a direct-motion mode, and extended long branches of the boughs are guided onto an elevation guide line in a perpendicular mode. The boughs have long placed fruit branches which are arranged in parallel and vertically extend into intervals. Before the two boughs climb a frame, two horizontal robust side position branches which are pulled along the reverse direction to be parallel to the boughs after the horizontal robust side position branches grow upward to the frame face. The side position branches have F-shaped single-shaft long placed type fruit branches which are arranged in parallel and vertically extend to the intervals. The tree shape only has the two boughs, and therefore the problems that an inclined crown appears easily in a three-bough tree shape and the main boughs intersect are solved. The two boughs oppositely extend in a direct-motion mode and do not influence each other. The two-bough tree shape is easy to reshape, and the two boughs are easy to form after the trunk is fixed. The phenomenon of lack of branches appears in a three-bough shed frame due to the fact that sprout force of a pear tree is weak. The three shape has the advantages that cultivation density is high, early-stage output is high, light conditions are good, the branches are easy to arrange in an ordered mode, uniformity of fruit quality is high, and standardization is easy to achieve.

An adhesive for polyolefin used for an extrusion-formed multilayered structure that includes, at least, a propylene type resin layer and an ethylene type resin layer, the adhesive for polyolefin comprising an olefin resin that has methyl branches at a ratio of 10 to 200 per 1000 carbon atoms on a main chain thereof.

The invention discloses a preparation method for improving lignin-based carbon fiber strength. Lignin-based carbon fiber is obtained by conducting degradation, oxidation, polymerization, spinning, pre-oxidization, densification and carbonization treatment on lignin; according to the preparation method, the lignin is rearranged and recombined, lignin structural units are arranged neatly and orderly, few branched chains exist, and the structure is stable; structure defects of fiber are overcome by means of densification treatment, the density of protofilament is further increased, and then the tensile strength and modulus of the lignin-based carbon fiber are improved; the method is simple, reliable and practical, and the strength of the lignin-based carbon fiber can be improved significantly.

The invention provides an alkynol modified fluorine-containing polyester compound, a preparation method thereof, an anti-oil stain auxiliary agent and application of the anti-oil stain auxiliary agent. The structural formula of the alkynol modified fluorine-containing polyester compound is shown in the specifications. The preparation method of the alkynol modified fluorine-containing polyester compound comprises the following steps of: mixing raw materials including binary acid, fluorine-containing unit alcohol and a first solvent, and carrying out a first reaction to obtain a fluorine-containing polyester prepolymer; and mixing materials including the fluorine-containing prepolymer and alkynol, and carrying out a second reaction to obtain the alkynol modified fluorine-containing polyestercompound. The anti-oil stain auxiliary agent comprises the alkynol modified fluorine-containing polyester compound. The application of the anti-oil stain auxiliary agent is used for anti-oil stain treatment of textiles. The alkynol modified fluorine-containing polyester compound provided by the invention has excellent oil stain resistance.

The invention provides a kiwi fruit aquatic root system induction method, and belongs to the technical field of kiwi fruit cultivation, the method comprises the following steps: 1) kiwi fruit branches are cut on fine sand for cultivation, and when the kiwi fruit branches grow root systems and the number of branching times is less than 3, cutting seedlings are obtained; and (2) performing water mist culture on the cutting seedlings obtained in the step (1) to realize induction of the aquatic root system of the kiwi fruit. By adopting the method provided by the invention, the suberization degree of each stage of root system of the actinidia chinensis cultivated by water mist is obviously lower than that of terrestrial root systems, the branching times of the root system of the actinidia chinensis cultivated by water mist are obviously lower than that of the terrestrial root systems, and the survival rate is high.