390 results about "Solution polymerization" patented technology

The invention discloses a hydrophilic polyacrylate / epoxy silica sol composite coating and a preparation method thereof. The composite coating is prepared from a polyacrylate epoxy silica sol solution containing carboxyl and a polyethylene glycol side chain through blending, coating, drying and heating crosslinking. The polyacrylate is synthesized by taking methyl methacrylate, methacrylic acid, hydroxyethyl methylacrylate and allyl polyethylene glycol as comonomers through a solution free radical copolymerization method, and the epoxy silica sol solution is prepared by taking tetraethoxysilane and gamma-glycidoxypropyltrimethoxysilane as raw materials through a solution polymerization method. The composite material is prepared through a sol-gel and core-shell preparation process. The preparation method comprises the following steps: carrying out solution blending on polyacrylate and epoxy silica sol, and carrying out coating, drying and other processes to generate the cross-linked polyacrylate / epoxy silica sol composite coating through a cross-linking reaction between carboxyl and epoxy. The prepared composite coating has the characteristics of long durability, wear resistance, hydrophilicity, antifogging, protein adsorption resistance and the like.

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The invention discloses a high-temperature-resistant, bending-resistant and high-flexibility polyimide film for flexible display and a preparation method of the high-temperature-resistant, bending-resistant and high-flexibility polyimide film. According to the polyimide film, by introducing the nano silicon dioxide particles and constructing the porous structure design, the problems that a traditional polyimide film is insufficient in stability in a high-temperature environment, cracks are likely to be generated after bending, and the flexibility is poor are effectively solved. The polyimide film disclosed by the invention is prepared by adopting a diamine monomer and a dianhydride monomer as main raw materials, adding nano silicon dioxide particles, and carrying out solution polymerization, gelation, pore regulation and control and thermal imidization processes. The obtained polyimide film has a micron-sized porous structure, keeps stable at a high temperature of 400 DEG C, does not generate cracks after being bent for 100,000 times, has tensile strength of more than or equal to 150MPa, elongation at break of more than or equal to 25% and light transmittance of more than or equal to 85%, and is suitable for a substrate material of a flexible display device.

The invention belongs to the technical field of lithium ion battery additive materials, and particularly relates to a high-compaction dispersion material and a preparation method thereof, and a high-compaction flexible positive pole piece, the high-compaction dispersion material comprises the following components by mass: 30-40 parts of a component A, 5-10 parts of a component B, 5-10 parts of a component C, and 40-60 parts of a solvent; wherein the component A comprises an unsaturated cyclic monomer, unsaturated polyether and a solution polymerization copolymer of an amine-containing monomer and a (methyl) acrylate monomer; the component B comprises a long-chain amine substance; the component C comprises organic ester; the high-compaction dispersion material, the preparation method thereof and the high-compaction flexible positive pole piece have the advantages of being excellent in dispersion performance, outstanding in softening effect, remarkable in pole piece compaction density improvement and the like, can have the two functions of dispersion and compaction improvement, reduces the production cost, improves the pole piece yield and has a good application prospect.

The invention provides a dynamic cross-linked polyolefin elastomer and a preparation method thereof. According to the method, a double-kettle serial solution polymerization process is adopted, a reaction material is generated through a polymerization reaction in a first reaction kettle, the reaction material is transferred into a second reaction kettle added with a dynamic cross-linking agent and an initiator for continuous reaction and then enters a devolatilization system, a quenching agent is added through a static mixer, then granulation is performed through a screw extruder, and the dynamic cross-linked polyolefin elastomer is obtained. According to the preparation method, dynamic chemical crosslinking is carried out in the production process of the polyolefin elastomer, and the mechanical property and thermal stability of the obtained polyolefin elastomer product can be improved on the premise of ensuring the processability.

The invention relates to a [NN] bidentate coordination metal catalyst based on a quinoline skeleton as well as a preparation method and application of the [NN] bidentate coordination metal catalyst. According to the preparation method, quinoline-8-formaldehyde and aniline are directly subjected to aldehyde-amine condensation under the catalysis of p-TsOH, and a quinoline-imino ligand is synthesized. The [NN] bidentate coordination metal catalyst based on the quinoline skeleton is prepared by carrying out one-pot reaction on the obtained ligand and in-situ synthesized MMe4 (M is Ti, Zr or Hf). The quinoline skeleton [NN] bidentate coordination metal catalyst is used for polyolefin synthesis. The preparation method has the advantages of simple synthesis process, easily available raw materials, high product yield and high temperature resistance, is suitable for high-temperature solution polymerization, and can be used for preparing high-performance polyolefin elastomers.

The invention provides star-shaped functionalized solution polymerized styrene-butadiene rubber and a preparation method thereof, and the preparation method comprises the following steps: S10, in an inert atmosphere, in an organic solvent, taking a conjugated diene monomer as a polymeric monomer, taking a substance obtained by premixing lithium alkyl and a front-end modifier as a functionalized initiator, and carrying out solution polymerization to obtain a polymer precursor; s20, adding an active coupling agent into the polymer precursor to obtain a star polymer with an active star core and a polar functional group at the tail end of each star arm; and S30, adding a functionalization reagent into the star polymer to obtain the star functionalized solution polymerized styrene-butadiene rubber with both chain end functionalization and chain middle functionalization. The front-end modifier and the active coupling agent are introduced, so that an active center is reserved in a star core, and the functionalization reagent is introduced to modify in a chain and enhance the interface bonding force between white carbon black and butadiene styrene rubber, so that the hysteresis loss of tire rubber is reduced, and the tire rubber is endowed with wear resistance, fatigue resistance and wet skid-rolling resistance balance.

The invention belongs to the field of oil and gas exploitation, and particularly relates to a carbon dioxide-salt double-response polymer thickening agent and a preparation method thereof. The carbon dioxide-salt double-response polymer thickening agent provided by the invention is prepared from acrylamide, acrylic acid, alkyl polyether acrylate and amine carbon dioxide response monomers through solution polymerization; after corresponding monomers of amine carbon dioxide are protonated, polymer molecular chains are better stretched through electrostatic interaction, the viscosity of the fracturing fluid can be increased, complexation and crosslinking of oxyethyl, oxypropyl and calcium and magnesium ions are facilitated, and therefore the tackifying effect of alkyl polyether acrylate is improved; meanwhile, oxyethyl and oxypropyl jointly regulate and control the tightness degree of a network structure, so that a calcium and magnesium ion'salt bridge 'tackifying effect is presented. According to the carbon dioxide-salt double-response polymer thickening agent provided by the invention, the viscosity of the thickening agent is improved through carbon dioxide and calcium and magnesium ions, and meanwhile, a fracturing fluid has certain imbibition oil displacement capacity after gel breaking.

The invention provides an ethylene maleic anhydride copolymer and a preparation and application method thereof, and the preparation method comprises the following steps: dissolving a maleic anhydride monomer in an organic solvent to form a uniformly dispersed solution system, and transferring the solution system into a high-pressure reactor; ethylene gas in a supercritical state is introduced into the solution system of the high-pressure reactor to form a uniform ethylene-maleic anhydride solution system, wherein the pressure of the ethylene gas in the supercritical state is 5-30 Mpa; adding a free radical initiator into the ethylene-maleic anhydride solution system, raising the reaction temperature, and carrying out solution polymerization reaction to obtain a reaction system; a precipitant is added into a reaction system to separate out the ethylene-maleic anhydride copolymer, ethylene and maleic anhydride in the ethylene-maleic anhydride copolymer alternately exist in the form that the molar ratio of ethylene to maleic anhydride is 1: 1, high-performance bonding composite resin can also be formed by blending the ethylene-maleic anhydride copolymer and polyethylene, and the high-performance bonding composite resin is suitable for the fields of adhesives, coatings, composite materials and the like.

The invention belongs to the technical field of supporting films, and particularly relates to an acrylate pressure-sensitive adhesive, a supporting film adhesive tape, a preparation method and application. The acrylate pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 60 to 90 parts of acrylate soft monomer, 5 to 20 parts of polar functional monomer, 5 to 20 parts of high-Tg hard monomer, 0.1 to 0.5 part of initiator, 0.5 to 3 parts of polyfunctional thermocuring cross-linking agent and a proper amount of solvent. According to the acrylate pressure-sensitive adhesive disclosed by the invention, the acrylate pressure-sensitive adhesive which has the characteristics of low modulus and high cohesion microcosmically is prepared under a solution polymerization and thermocuring process through a specific'soft monomer-hard monomer-crosslinking agent 'formula system design. The pressure-sensitive adhesive macroscopically realizes the performance balance, which is difficult to realize at the same time, among adhesion, buffering and impact resistance.

The invention belongs to the technical field of antibacterial agents, and relates to a polycation-pi antibacterial agent as well as a preparation method and application thereof. The antibacterial agent has a controllable sequence structure, the main chain of the polymer is composed of alternate hydrophobic chain segments and hydrophilic chain segments, guanidine salts are regularly arranged, surface positive charges are intensively distributed, and multiple interactions of cation-pi, hydrogen bonds and pi-pi stacking can be generated among molecules of the antibacterial agent. The preparation method comprises the following steps: in the presence of a catalyst or in the absence of the catalyst, carrying out melt polymerization or solution polymerization on polycation guanidine salt and a compound with a benzene ring in a molar ratio of (0.8-1.2): 1 to obtain the polycation-pi antibacterial agent. According to the application, the antibacterial agent is used for finishing a fabric to obtain an antibacterial fabric, and the fabric is made of hydrophobic fibers. The preparation method of the antibacterial agent is simple, and the antibacterial fabric with durable antibacterial, directional moisture permeable and refrigeration effects can be prepared by adopting the antibacterial agent.

The invention relates to a long-acting antibacterial polyamide fiber and a preparation method thereof. The long-acting antibacterial polyamide fiber is prepared from 4wt%-20wt% of nylon-guanidine salt copolymer master batch and 80wt%-96wt% of nylon, and the preparation method of the long-acting antibacterial polyamide fiber comprises the following steps: carrying out melt blending reaction on polyepoxy polystyrene synthesized by a solution polymerization method or a suspension polymerization method or a bulk polymerization method and a guanidine salt polymer antibacterial agent to obtain a polystyrene-guanidine salt copolymer functional material; then carrying out melt blending with nylon to obtain nylon-guanidine salt copolymer master batch; and finally, blending, melting and spinning with nylon to obtain the long-acting antibacterial polyamide fiber. By adopting the nylon-guanidine salt copolymer master batch disclosed by the invention, on one hand, the antibacterial agent is chemically bonded to a polyamide matrix, so that the long-acting antibacterial property of the fiber is ensured; on the other hand, the antibacterial agent is enriched on the surface of the antibacterial polyamide fiber. When the dosage of the antibacterial agent is low, the long-acting antibacterial polyamide fiber shows excellent antibacterial performance, so that the good mechanical property of the long-acting antibacterial polyamide fiber is kept at the same time.

The invention discloses a fluorine-containing chain extender, a composition for preparing a PLA (polylactic acid) foaming material, the PLA foaming material and a preparation method of the PLA foaming material. The fluorine-containing chain extender is prepared by a solution polymerization method, and prepared monomers comprise methyl methacrylate, glycidyl methacrylate and dodecafluoroheptyl acrylate in a molar ratio of (3-6): (0.1-2): (0.1-2). The composition for preparing the PLA foaming material comprises pure PLA and a fluorine-containing chain extender, wherein the mass of the fluorine-containing chain extender is 4-8wt% of the mass of the pure PLA. The PLA foaming material is prepared from the composition for preparing the PLA foaming material. The PLA foaming material prepared by the invention has relatively high expansion rate and cell density.

The invention discloses a high-strength acrylate rubber material and a preparation method thereof, and relates to the technical field of high polymer materials. When the high-strength acrylate rubber material is prepared, polyhydroxy imidazolium salt and phosphorus pentoxide react to prepare a functional flame retardant; reacting the pre-modified glass fiber with hydrazine hydrate to obtain modified glass fiber; the preparation method comprises the following steps: carrying out solution polymerization on ethyl acrylate, butyl acrylate, acryloxy propyl bis (trimethylsiloxy) methylsilane and glycidyl methacrylate to prepare acrylate raw rubber; the high-strength acrylate rubber material is prepared by uniformly mixing acrylate raw rubber, the modified glass fiber, a functional flame retardant and triphenyl phosphine, plastifying and thin-passing. The high-strength acrylate rubber material prepared by the invention has excellent flame-retardant, antibacterial, anti-aging and mechanical properties.

The invention discloses ionic conductive hydrogel, a preparation method, a wearable flexible sensor and application, and belongs to the technical field of hydrogel. The preparation method comprises the following steps: adding chitosan into an acrylic acid solution, dissolving, adding a peroxide initiator, aluminum salt and a polydopamine solution, and polymerizing at 65-75 DEG C to obtain the ionic conductive hydrogel. By controlling the polymerization temperature and the charging sequence, the contradiction between the high-temperature requirement of peroxy compounds and the thermal degradation of biological macromolecules is broken, and the transparency and the sensitivity of the ionic conductive hydrogel are improved. The obtained ionic conductive hydrogel has high transparency (95%) and high sensitivity, has a wide monitoring range when being used as a hydrogel sensor, can accurately detect micro deformation of 1% strain, still keeps high sensitivity under 600% strain, has a sensitivity coefficient of 47, and has a good application prospect. And the high-end application requirements of a new-generation flexible electronic system in the fields of medical monitoring, intelligent man-machine interaction, wearable equipment, intelligent robots and the like are met.

According to the invention, rigid anthracene is introduced as a framework of bridged binuclear metal, a pyridylamino binuclear metal titanium-zirconium-hafnium catalyst is constructed, and the molecular weight of the obtained polymer can be effectively improved through the synergistic effect between the binuclear metal and the steric hindrance and electronic effect on the catalyst structure; the polyolefin elastomer (POE), the isotatic polypropylene (iPP) and the propenyl elastomer (PBE) are efficiently synthesized. The pyridylamino binuclear metal titanium-zirconium-hafnium catalyst has the advantages that synthesis is simple, raw materials are easy to obtain, and the product yield is high. In copolymerization of ethylene and alpha-olefin, the catalyst shows excellent activity (5.75 * 10 < 7 > g (POE). Mol <-1 > (M). H <-1 >) and alpha-olefin selectivity (the insertion rate reaches 16.2 mol%), and the polyolefin elastomer POE with excellent performance is prepared. In propylene polymerization, the regularity of the polypropylene chain segment can be effectively regulated and controlled by adjusting the steric hindrance and the electronic effect of the catalyst, and the regularity gt is prepared with high activity (3.84 * 10 < 7 > g (PP). Mol <-1 > (M). H <-1 >); and the polypropylene material with high stereoregularity is prepared from 80 mmmm% of polypropylene with high stereoregularity. In copolymerization of ethylene and propylene, an elastomer material which takes propylene as a main material, can regulate and control the ethylene content to be 5-50 wt% and has unique characteristics of a propylene-ethylene semi-crystalline copolymer is prepared. In addition, the pyridylamino binuclear metal titanium-zirconium-hafnium catalyst also shows excellent high-temperature resistance (higher than 160 DEG C), is suitable for high-temperature solution polymerization, and can be used for preparing high-performance polyolefin elastomers. Therefore, the invention has original innovation, and provides a new direction for the development of the field of polyolefin materials.

The present application provides an all-steel snow tire tread, consisting of the following raw materials in parts by weight: 50-80 parts of natural rubber, 20-50 parts of solution polymerized styrene butadiene rubber with dual glass transition temperatures, 40-60 parts of carbon black, 10-20 parts of white carbon black with a high specific surface area, 1-2.5 parts of silane coupling agent, 5-10 parts of modified anti-wet skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of anti-aging agent 4020, 1-3 parts of anti-aging agent RD, 1-3 parts of protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of promoter NS.

A cellulose-based all-solid-state polymer electrolyte separator, a preparation method thereof and an application thereof are provided. The cellulose separator is used as a skeleton, and solid-state polymer electrolyte is injected into pores of the separator using atomic layer deposition and dipping-coating processes. In addition, the polymer electrolyte remains in an amorphous structure at high temperatures by using an instantaneous quenching method, and ionic conductivity of the solid-state polymer electrolyte at room temperature is improved. After a surface of the solid-state polymer electrolyte separator is further coated with an alumina nanolayer, an electrochemical window width of the separator is significantly increased, and the solid-state polymer electrolyte separator is prevented from decomposing under a high voltage.

The invention provides a phosphorus-nitrogen coordinated metallocene compound and a preparation method and application thereof, the compound has a structure as shown in a formula I: in the formula I, M is selected from IVB group metals in the periodic table of elements; r1 is selected from hydrogen, halogen, C1-C10 direct or branched alkyl, and C1-C3 alkoxy; r2 is selected from hydrogen and C1-C6 straight chain or branched chain alkyl; y is selected from chlorine, C1-C3 alkyl substituted or unsubstituted by trimethylsilyl, and amino substituted by trimethylsilyl. The phosphorus-nitrogen coordinated metallocene compound provided by the invention has relatively high thermal stability, catalytic activity and comonomer insertion rate, and can realize high-temperature solution polymerization of ethylene and norbornene.

Embodiments of a dual reactor solution polymerization process include: introducing a first feed comprising an ethylene monomer, optionally hydrogen, optionally a C3-C12 alpha-olefin comonomer, and a hydrocarbon solvent into a first polymerization reactor to produce a first reactor product comprising an ethylene-based polymer via solution polymerization at a temperature of 100 DEG C to 225 DEG C; and introducing the first reactor product and a two-phase second feed comprising an ethylene monomer, a hydrocarbon solvent, optionally hydrogen, and optionally a C3-C12 alpha-olefin comonomer to a second polymerization reactor to produce an ethylene-based polymer via solution polymerization, wherein the weight ratio of the sum of hydrocarbon solvent plus comonomer in the two-phase second feed to ethylene monomer is 0.1 to 2.0.

The invention relates to the technical field of water-soluble polymer chemical polymerization reaction, in particular to a preparation method of a star-shaped polyacrylamide papermaking retention and drainage aid, which adopts a'core-first arm-second arm 'polymerization mode and a redox initiation system, and realizes a star-shaped structure of a product through multi-step process control. The preparation method comprises the following steps: carrying out solution polymerization and redox initiation on a star-shaped skeleton, acrylamide and a cationic monomer to obtain a colloid, and finally drying, crushing and sieving to obtain the star-shaped polyacrylamide polymer. Compared with a similar polyacrylamide retention and drainage aid, the polyacrylamide retention and drainage aid can be well used for increasing the retention rate of pulp and filler and improving the water filtering performance in the field with more complex papermaking wet end chemical environment as a retention and drainage aid, has better paper pulp water filtering and retention performance, and has a wide application prospect.

This invention discloses an amphiphilic uniform penetration inhibitor oil displacement agent, its preparation method, its application, and a method for improving oil recovery. The preparation method of the amphiphilic uniform penetration inhibitor oil displacement agent comprises the following steps: In the presence of an initiator and a solvent, sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine undergo a solution polymerization reaction. The molar ratio of sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine is 1:0.01–25:0.01–50:0.01–50. The solution polymerization reaction results in an amphiphilic uniform penetration inhibitor oil displacement agent with a viscosity-average molecular weight of 35 million to 40 million.

The invention relates to a method for producing copolymers by solution polymerization based on at least 1, 3-butadiene and at least one hydrocarbon which is different from 1, 3-butadiene and contains at least one olefinic double bond as monomers, using one or more organolithium compounds as initiators, wherein the polymerization is carried out at a temperature of the reaction mixture of 0 DEG C to 50 DEG C and a pressure of 0.2 MPa to 0.6 MPa, and wherein 55% to 65% by weight, based on the total mass of monomers, of 1, 3-butadiene is added to the reaction mixture; a copolymer comprising units derived from 1, 3-butadiene and units derived from, as monomers, at least one hydrocarbon different from 1, 3-butadiene and comprising at least one olefinic double bond wherein the copolymer comprises monomer units derived from 1, 3-butadiene of formulae (A), (B) and (C) wherein all of the units derived from 1, 3-butadiene present in the copolymer are units derived from 1, 3-butadiene of formula (A), (B) and (C). The proportion of (A) is at least 80 mol% among monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the sum of the proportions of (B) and (C) is not more than 20 mol% among all monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the copolymer has a number average molecular weight Mn of from 2,000 g / mol to 5,400 g / mol and a glass transition temperature TG of from-15 DEG C to 5 DEG C; and to the use of the copolymers according to the invention as reactive cross-linking agents.

The invention discloses an irradiation cross-linked biodegradable composite plastic straw and a preparation method thereof. The irradiation cross-linked biodegradable composite plastic straw is prepared from the following raw materials in percentage by mass: 40-80% of polylactic acid, 15-45% of nano inorganic filler, 0.4-1% of chain extender, 1-3% of flexibilizer, 1-3% of lubricant, 0.3-1% of nucleating agent, 0.3-1% of coupling agent, 1-10% of cross-linking agent and 0.3-1% of compatilizer. The chain extender is an epoxy group chain extender copolymer which contains 6-9 epoxy functional groups and is formed by copolymerizing glycidyl methacrylate, styrene and acrylic acid low-carbon alcohol ester through a solution polymerization or suspension polymerization process. The heat resistance of the polylactic acid composite plastic can be improved through irradiation processing, the polylactic acid composite plastic straw has higher heat resistance and does not deform in a high-temperature use environment, and pathogenic bacteria and viruses in a product are killed in the irradiation crosslinking process at the same time.

The present invention provides an adhesive sheet having a photocurable adhesive layer, wherein the photocurable adhesive layer exhibits photocurability suitable for a reduction in peel strength due to light irradiation and is based on a polymer that does not utilize solution polymerization. [Solution] Provided is an adhesive sheet having an adhesive layer that is cured by light irradiation. The total content of the azo-based polymerization initiator and the peroxide-based polymerization initiator in the adhesive layer is 1.0 [mu] g / g or less. The adhesive sheet has a storage modulus increase rate of 300% or more as determined by the following formula. The storage modulus increase rate [%] = (R / Q-1) * 100 (wherein Q and R are storage modulus G '([Pa]) at 25 DEG C as determined by dynamic viscoelasticity measurement, Q is initial storage modulus G' measured using a measurement sample obtained from the adhesive layer, and R is post-curing storage modulus G 'measured after curing by irradiating the measurement sample with ultraviolet light).

The invention belongs to the field of concrete admixtures, and particularly relates to a viscosity-reducing surface brightener as well as a preparation method and application thereof. The preparation method of the viscosity-reducing surface brightener comprises the following steps: carrying out polymerization reaction on a polyether macromonomer, unsaturated carboxylic acid, unsaturated carboxylic ester and a modified monomer in water, the polymerization reaction system is converted from initial solution polymerization to soap-free emulsion polymerization by controlling the proportion of unsaturated carboxylic acid, unsaturated carboxylic ester and modified monomer in the polymerization reaction system, and the obtained polymerization reaction product is the viscosity-reducing surface brightener. The viscosity-reducing surface brightener prepared by the method provided by the invention can effectively improve the initial flowability and glossiness of concrete at a lower mixing amount.

The present invention relates to a cross-linkable rubber composition, a cross-linked rubber composition obtained by cross-linking such a rubber composition, a method of preparing a tyre and a tyre. The cross-linkable rubber composition comprises, per hundred parts by weight of rubber (phr): 100 phr of a blend of a natural rubber (NR), a polybutadiene rubber (BR), and first and second solution polymerized styrene-butadiene rubbers (SSBR), a silica filler, and a resin, wherein the rubber composition comprises: ≥ 5 phr to ≤ 30 phr of NR; ≥ 20 phr to ≤ 80 phr of BR; ≥ 5 phr to ≤ 40 phr of the first SSBR having a glass transition temperature Tg, determined by differential scanning calorimetry (DSC) according to ISO 22768, in a range of ≥ −30°C to ≤ 0°C; ≥ 10 phr to ≤ 50 phr of the second SSBR having a glass transition temperature Tg, determined by differential scanning calorimetry (DSC) according to ISO 22768, in a range of ≥ −120°C to ≤ −40°C; ≥ 5 phr to ≤ 25 phr of a first silica filler having a BET surface area in a range of ≥ 190 m2 / g to ≤ 320 m2 / g, determined according to ASTM D1993, and ≥ 75 phr to ≤ 200 phr of a second silica filler having a BET surface area in a range of ≥ 70 m2 / g to ≤ 100 m2 / g, determined according to ASTM D1993.

This invention relates to a method for manufacturing a catechol-containing co-polymer through a suspension polymerization or a solution polymerization process. In some illustrative embodiments, this disclosure relates to a process of a free radical suspension polymerization for large-scale manufacturing catechol-containing copolymers. In some other illustrative embodiments, this disclosure relates to a solution polymerization of free radical, cationic, or anionic process for large-scale manufacturing catechol-containing copolymers. The process and the product thereof are within the scope of this disclosure.

The present invention relates to an injectable high-strength hydrogel for bone tissue repair and a preparation method thereof. A poly(hydroxyethyl acrylate-methyl acrylate) random copolymer is prepared by solution polymerization. The copolymer is fully swollen in water to obtain a physically cross-linked hydrogel. The hydrogel is injectable and gelled in vivo under shear thinning. The gel exudation is enhanced under physiological conditions. Bioactive glass that can form hydrogen bonds with the copolymer is mixed to prepare the injectable high-strength hydrogel. The hydrogel can not only provide good support for the bone defect site, but also promote the proliferation and differentiation of cells therein. The hydrogel of the present invention is simple to prepare, easy to operate, quick to respond, good in biocompatibility, has good self-repair ability, is injectable, and has little minimally invasive damage. It has good application prospects in the field of irregular bone defect repair.

The invention provides a polymer bonded fiber, a preparation method and application. The polymer adhesive fiber is prepared from the following raw materials in parts by mass: 35 to 75 parts of a monomer A, 10 to 20 parts of a monomer B, 10 to 40 parts of a monomer C, 0.2 to 0.5 part of an initiator and 0.1 to 0.5 part of a molecular weight regulator, polymer bonding fibers are prepared through a free radical solution polymerization reaction, then the bonding fibers with high tensile strength and high porosity are obtained through a solvent exchange precipitation process, the bonding fibers can be subjected to composite molding with inorganic particles, the adsorption and locking effects between the inorganic particles and a fiber substrate are enhanced, and the bonding fibers are not prone to falling off; the novel non-woven fabric composite material which is firm in bonding, intact in pore channel and excellent in mechanical property is obtained, and can be used for developing light and breathable functional textiles, drug-loaded medical dressings and flexible conductive substrate materials.