3648results about How to "Increase crosslink density" patented technology

Low viscosity ternary mixtures of benzoxazine, epoxy and phenolic resins have been developed. The blends render homogeneous and void free cured specimen with a wide range of properties. Melt viscosity values as low as 0.3 Pa.s at 100° C. can be achieved. The phenolic resin acts as a cure accelerator to the system, besides its typical function as a hardener of epoxy resin. Glass transition temperatures Tg as high as 170° C. can also be obtained.

The invention relates to a high-sealing polyacrylic ester dispersoid and a preparation method thereof; a multi-element emulsifier system which consists of an anionic emulsifier and a compound non-ionic emulsifier is adopted for controlling the charging process and components of the emulsifier in different polymerization periods, and the room-temperature self-crosslinking high-sealing polyacrylic ester dispersoid is prepared by a semi-continuous seeding emulsion polymerization process. The dispersoid has small particle size, good electrolyte-resistance (calcium ion) stability and high tolerance to various film forming accessory ingredients (various organic solvents with high boiling point). The dispersoid is used as seal coat of water-based wood coating and has good sealing performance to various woods; harmful volatile organic compounds (VOC) such as formaldehyde, and the like sealed against escaping from plates to pollute indoor environment, and the colored compounds such as turpentine, pine oil and tannin and the like are sealed against dissolving out of the plates to pollute pure top coating and white top coating of a water-based wooden ware; and in addition, the dispersoid can be used in water-based leather finishing agents.

The invention relates to a method for preparing graphene crosslinked type organic aerogel and carbon aerogel by normal-pressure drying, which takes phenols (P), amines, aldehydes, catalyst and solvent as a reaction system and graphene substances containing active functional groups as a cross-linking agent. The method comprises the steps of: curing to obtain organogel, and then carrying out normal-pressure drying to obtain the organic aerogel; and carrying out pyrolysis on the organic aerogel in the inert atmosphere at the temperature of 500-1600 DEG C to obtain the graphene crosslinked type carbon aerogel. The preparation method of the organic aerogel and the carbon aerogel is simple and rapid in technology; the conventional supercritical drying technology is avoided, and the prepared novel organic aerogel and carbon aerogel materials taking graphene as framework have new performances and wide application prospect; and the industrial production of the carbon aerogel can be expected to be realized.

The invention is based on the discovery that adhesive compositions containing certain low-viscosity, mono-ethylenically unsaturated monomers have surprisingly good cure parameters, resulting in very little weight loss upon cure. Many of these monofunctional monomers used alone or in combination with other monofunctional monomers described herein have high glass transition temperatures when cured. Moreover, since these monomers are monofunctional the crosslink density of the adhesive composition does not increase (relative to multi-functional monomers), which in turns results in lower stress, lower modulus adhesive compositions. As such, these monomers are useful in a variety of thermoset adhesive compositions, such as for example, die attach adhesive compositions.

The invention discloses a preparation method for a formaldehyde-free protein adhesive, mainly comprising the following steps: 1) adding a protein-containing raw material and water and stirring at room temperature; 2) adding acidity-adjusting agent for reaction at 20-40 DEG C; 3) adding enhancer for reaction at 20-50 DEG C; and 4) adding preservative and stirring at room temperature to obtain the formaldehyde-free protein adhesive. In the invention, the adhesive is prepared based on protein-containing by-products of plants or animals, has the characteristics of low cost, wide source, renewability and the like, does not contain formaldehyde, has no toxicity, is environmental friendly and has superior market prospect. In addition, the existing degreased miscellaneous meal for low value-added product of animal feed, fertilizers and the like can be developed into high value-added products, thus providing a new way for development of environmental-friendly biomass-based wood adhesive and resource utilization of industrial by-products.

The invention provides an UV curing coating, a wear-resistant and antifouling coating layer and a mobile phone protection film containing the wear-resistant and antifouling coating layer. The coating comprises, in parts by weight, 10-95 parts of a first prepolymer, 5-60 parts of a second prepolymer, 0.05-8 parts of a polysilazane-based polymer, 0.05-8 parts of a fluorine-containing aid, 1-15 parts of a photoinitiator and 100-300 parts of a solvent, wherein the first prepolymer is a urethane acrylate prepolymer with a functionality degree of 4-8; the second prepolymer is an acrylate prepolymer with a functionality degree of 9-18. The wear resistance of the coating layer formed after curing the UV curing coating can be improved by the first prepolymer and the second prepolymer with high functionality degrees, improvement for the wear resistance of the coating layer and prolonging for the service life of the coating layer are benefited due to the adding of the polysilazane-based polymer and a polar compound, and the good antifouling performance of the coating layer can be ensured, and the reduction of the antifouling performance of the coating layer can be suppressed due to the fluorine-containing aid. The coating layer has both good antifouling performance and wear resistance.

A devulcanization product of comminuted scrap rubber of rubber granules, in which the sulfur bridges of the rubber granule surface are broken and activated for a new vulcanization, is produced by treating the rubber granules to swell the rubber structure of the granule surface and by mixing the treated rubber granules with a devulcanization formulation, acting mechanically and chemically reductively on the rubber granules, in a heating and cooling mixer combination. The rubber granules and the devulcanization formulation are heated to a temperature of 105-150° C. and subsequently immediately cooled. A devulcanization compound is prepared by mixing the devulcanization product with vulcanization and binding agents so as to coat the rubber granules uniformly with them The devulcanization compound can also be prepared by coating the swelled rubber granules in layers by admixing vulcanization agents such as accelerators, activators, auxiliary agents, binding agents, oxygen radical donors and scavengers.

The invention is a radiation curable coating containing an antimicrobial agent, where upon irradiation with UV light, the radiation curable coating rapidly cures to a polymeric coating. The polymeric coating has durable antimicrobial properties, being especially effective at preventing the growth of Staphylococcus aureaus and Kleibsella pneunoniae on wood flooring and furniture. The major components in the radiation curable coating are a urethane acrylic oligomer, a radiation cure package, an antimicrobial agent, a cross-linking agent, and optionally, an additive package. The radiation curable urethane oligomer is a relatively short chain backbone urethane polymer that is end capped with a radiation curable moiety, where the moiety is an acrylic. The cross-linking agent is one or more monomers used to lower the viscosity and promote cross-linking, and include acrylate esters of mono-, di-, tri-, or tetrafunctional alcohols. The radiation cure package contains at least one photoinitiator.

The invention discloses a high-solid-content UV-curing aqueous urethane acrylate dispersion liquid and a preparation method thereof, wherein the method comprises the following steps of: firstly carrying out the monoesterfication reaction on the partial hydroxide group at the tail end of hyperbranched polyester and the anhydride group of dicarboxylic anhydride to obtain an intermediate I; carrying out the end capping reaction on an isocyanate group in diisocyanate and the hydroxide group in a hydroxyalkyl methacrylate monomer to obtain a reaction intermediate II; carrying out the reaction on the residual hydroxide group of the intermediate I and the residual isocyanate group of the reaction intermediate II to obtain a reaction intermediate III; and carrying out alkali neutralization, aqueous dispersion and reduced-pressure distillation on the reaction intermediate III to remove an organic solvent to obtain the UV-curing urethane acrylate aqueous dispersion liquid. The dispersion liquid has the characteristics of high solid content, relatively low viscosity, UV curability, good mechanical performance of a paint film and the like, conforms to the concept of environmental protection, can be applied to the fields of environment-friendly coatings, aqueous ink, aqueous adhesives, fabric coating agents and the like and has broad prospect.

The invention provides nanometer spray plating for a silver mirror, namely obtain a high glaze metal mirror face by adopting coating technique, which is similar to the brand new decorative effect of plating. The whole technique consists of a paint bottom layer, a metal reflecting layer (spray plating layer) and a paint surface layer. The coating has excellent adhesive attraction, shock resistance, corrosion resistance, weather resistance and marresistance, has rich colors and is bright like a mirror. The nanometer spray plating can be used to various materials such as metal, resin, ABS, PC, PP+PS carbon element resin, plastic, glass, pottery and porcelain, acrylic, wood, plastic wood and calcium plastic.

Improved golf ball exterior coatings which are used to create an extremely uniform hydrophobic or hydrophilic exterior surface on the golf ball. When the surface of the golf ball is hydrophobic, it tends to repel water, and this reduces drag on the golf ball surface as the golf ball travels through the air. When the surface of the golf ball is hydrophilic, the surface of the golf ball wets uniformly and the ball rolls straighter on a wet green, as the forces acting on the ball are more uniform. The hydrophobic or hydrophilic exterior coating is applied to the golf ball using vapor-phase deposition in instances where strict control over coating thickness uniformity, and/or reduced surface roughness is desired.

The invention relates to the preservative coating technology, in particular to a water-based two-pack polyurethane preservative coating and a preparation method thereof. The water-based two-pack polyurethane preservative coating comprises two parts, namely paint vehicle and curing agent, wherein the paint vehicle is prepared from water-based hydroxylated acrylic dispersion, modified resin, pigment, filler, additive and water, the curing agent part comprises hydrophilic aliphatic isocyanate, dodecyl ester and propylene glycol methyl ether acetate. When using the coating of the invention, the weight ratio of the paint vehicle to the curing agent is 74-85:15-26 and the coating can solve the defects of the existing preservative coating.

A flexible hose comprising a tube, a knit fabric, and a cover. The knit fabric comprises a hybrid yarn which comprises a first yarn of co-para-aramid fibers and a second yarn of meta-aramid fibers. The hose exhibits significantly improved burst pressure and/or improved impulse fatigue resistance.

An epoxy resin represented by general formula (2), R1-R4 indicate hydrocarbon group of carbon number 1-6, n is 0 or integer of 1 or more and X in aromatic compound (1) is a bond or following general formula wherein R1-R6 indicates hydrogen atom or hydrocarbon group of carbon number 1-6, obtained by reacting aromatic compound represented by general formula (1) and epihalohydrine, having molecular weight distribution comprising, content of n=0 component in the epoxy resin represented by general formula (2) is 60% or less and epoxy equivalent is 250 g/eq or over.

The invention relates to expanding type fireproof paint taking polyurea resin as a film forming substance and application of the expanding type fireproof paint. The expanding type fireproof paint contains a component A and a component B, wherein the component A contains an isocyanate prepolymer, the component B contains an amino-terminated polyether, a polyamine chain expanding agent, a diluting agent, a carbonizing catalyst, a carbonizing agent, a foaming agent, a flame retardant, a smoke suppressing agent, a pigment filler, an adjuvant and a mixed solvent, and the weight ratio of the component A to the component B is 1:5 to 1:7. The fireproof paint is suitable for the fireproof protection of indoor and outdoor steel structures and nonmetal structures and can be used for prohibiting the propagation of flame and the transmission of heat to a substrate. The expanding type fireproof paint is suitable for the fireproof protection in the fields of airport facilities, municipal engineering, vehicles, ships, petrochemical facilities and the like.

The invention discloses a high-frequency copper foil substrate with an operating frequency of more than 1GHz, which has a dielectric constant Dk of less than 3.2 and a loss factor Df of less than 0.005 as well as high glass transition temperature, high thermostability and low moisture-absorption characteristic. The high-frequency copper foil substrate contains a special composite material and is prepared by impregnating a reinforcing material with blended resin mixture. The resin mixture of the composite material is prepared by blending the following materials: (a) high molecular weight polybutadiene resin; (b) low molecular weight polybutadiene resin; (c) modified polyphenyl ether thermosetting resin; (d) inorganic powder; (e) flame retardant; (f) cross-linking agent; (g) binding aid; and (h) hardening initiator. In the invention, the drawback of low processability of pure polybutadiene with low viscosity and the drawback of need of adding plasticizer of polyphenyl ether resin (PPE) with low solubility; particularly, the non-viscous pre-impregnated sheets made by the composite material can be processed into copper foil substrates automatically.

The invention discloses high-strength directly aluminizing water-based base coat and a preparation method and application of the high-strength directly aluminizing water-based base coat. The directly aluminizing water-based base coat comprises the following components in parts by mass: 50-80 parts of water-based resin, 6-16 parts of cosolvents, 0.1-1 part of flatting agents, 0.05-0.20 part of antifoaming agents, 0.05-0.5 part of slipping agents, 1-6 parts of hardening agents, 0.1-0.3 part of pH regulator, 0.2-2 parts of thickening agents, 0-2 parts of crosslinking agents and 6.2-36.2 parts of water. With good closure, the direct aluminizing water-based base coat disclosed by the invention guarantees the filling of micropores in the paper surface as well as the separation of water vapor; due to the characteristic of flexibility, the bending resistance of paper is realized; the viscosity resistance ensures that the film rolls are not bonded with each other after base coating on the aluminizing body paper; moreover, by adjusting the leveling property of the selected resin system and the coating, the base coat has high aluminizing metal texture.