751results about How to "High thermal decomposition temperature" patented technology

The invention relates to materials and a method for preparing high flame-retardancy organic intercalation layered clay. The method is performed by inserting melamine or derivatives of melamine into layered clay, especially montmorillonite layers, and the invention is characterized in that the inserted material is at least one compound of salt formed by melamine or derivatives of melamine and an organic acid and is inserted in the clay by cation exchange. The invention also relates to a method for preparing the materials. In the method, the materials are prepared from melamine, derivatives of the melamine and the layered clay by the steps of material mixing, dispersing, cation exchange, grinding and the like. The organic layered clay prepared by the invention can disperse in polymers, has excellent expansion performance and flame retardancy, and can be used as an expansion type fire prevention additive, or used as an expansion type flame retardant component for preparing additives of flame retardant plastic, rubber, thin films, coating, foam plastic and the like.

The invention relates to a thermosetting resin composition with high heat conductivity, a prepreg manufactured by adopting the same and a copper-clad laminate. The thermosetting resin composition with high heat conductivity comprises the following components in parts by mass: 5 parts of allyl phenolic compound, 5-40 parts of bismaleimide compound, 0-30 parts of modified resin, 25-85 parts of filler and 1-8 parts of catalyst. The thermosetting resin composition with high heat conductivity, which is provided by the invention, has the superior properties of high heat conductivity, high glass transition temperature, low CTE, high heat decomposition temperature, favorable process deformability and the like; the prepreg is simple to manufacture and has better heat resisting effect and high heat conductivity; and the copper-clad laminate can be applied to the manufacture of a high multi-layer circuit with high-temperature resistance and has simple manufacture process and lower cost.

The invention discloses a preparation method of a biomass-base polyurethane foam material, belonging to the technical field of chemical industry. The method mainly comprises the following steps: mixing polybasic alcohol liquefier and liquefying catalyst, putting the mixture in a container, heating to 150-200 DEG C, adding biomass waste and industrial lignin, liquefying, and cooling to room temperature to obtain a biomass liquefied product; and mixing the prepared biomass liquefied product, foaming catalyst, foam stabilizer, foaming agent and lignosulphonate into a component A, using isocyanate as a component B, mixing the component A and component B in a mixing vessel, stirring at 20-40 DEG C at 8000-14000 rpm for 5-30 seconds, pouring the mixture into a die, naturally foaming for 5-60 seconds, standing at 80-120 DEG C for 8-24 hours, and storing at room temperature for 8-24 hours until the mixture is sufficiently aged and formed. The invention can obviously improve the properties of the biomass-base polyurethane foam.

The invention discloses a process for preparing hydroxyl polyhedral oligomeric silsesquioxane modified polyurethane, which includes the steps of reacting diisocyanate with polyether diols in the presence of catalyst and under protection of nitrogenous atmosphere to obtain prepolymer, adding 1, 4-butanediol and polyhedral oligomeric silsesquioxane to serve as chain extenders to fully react, and preparing modified polyurethane having good film forming property and heat resistance through chemical bonding modification, so that defects of poor abrasion resistance and heat resistance of traditional polyurethane are overcome. When the content of the hydroxyl polyhedral oligomeric silsesquioxane is increased from 0 to 10%, the glass-transition temperature of the modified polyurethane is increased by 4.7 DEG C, i.e. from -33.5 DEG C to -28.8 DEG C, the melting temperature is increased by 10.2 DEG C, i.e. from 44.3 DEG C to 54.5 DEG C, and the thermal decomposition temperature of the modified polyurethane is respectively increased by 35.5 DEG C and 11.9 DEG C.

The invention discloses a colorless and transparent polyimide film, the molecular structural formula as shown in a formula I. A preparation method of the polyimide film comprises the following steps: polymerizing a fluorine-containing diamine monomer and a dianhydride monomer which have same moles in a polar aprotic solvent to produce a colorless and transparent poly(amicacid) solution, carrying out dehydration and ring closing on the colorless and transparent poly(amicacid) solution by using a hot imidization method or a chemical imidization method to produce the colorless and transparent polyimide film, wherein the dianhydride monomer is one or two of compounds selected from bicyclic (3,3,0)octane-2,4,6,7-tetracid dihydride or bicyclic (4,3,0)nonane-3,4,7,9-tetracid dihydride, the fluorine-containing diamine monomer is one or a combination of two of compounds selected from 4,4'-di(4-amino-2-trifluoromethylphenoxy)diphenyl ether, 4,4'-di(4-amino-2- trifluoromethylphenoxy) biphenyl and 2,2'-di(4-(4-amino-2- trifluoromethylphenoxy) phenyl) hexafluoropropane. The colorless and transparent polyimide film produced by using the alicyclic type dianhydride monomer has excellent performances such as good heat resistance, good solubility and high light transmittance.

The invention discloses polyamide resin and intermediate compound thereof as well as the preparation method and the application. The polyamide resin is provided with the chemical structure shown in formula II, wherein, X1 and X2 can be identical or different, representing quadrivalent aryl; Ar represents bivalent aryl, and T represents end capping reagent. The polyamide resin is obtained by polyamic acid shown in formula I structure general formula through chemical imidization or thermal imidization. The polyamide resin is dipped through prosomatic polyamic acid solution or polyamic acid solution being obtained after being dissolved with solvent with a low-boiling point, the basal body is strengthened, and the prepreg is obtained. After the heat-press forming operation is performed, a metal foil layer is covered, and a metal foil layer pressing plate is obtained. The polyamide resin provided by the invention has the advantages of excellent heat resisting property, high mechanical property, low dielectric constant and dissipation, high electrical insulation property and low water absorbing capacity, thereby being especially suitable for manufacturing core plates of packaging subsctrates for packaging super large-scale integrated circuits.

The invention discloses a preparation method of copper clad plate and the method comprises the following steps: (1) adopting bismaleimide resin and allyl compound in a weight ratio of 100:40-100 to react at 110-160 DEG C for 10-120min and obtain prepolymer, cooling to room temperature after finishing the reaction, using acetone to prepare prepolymer solution; (2) adding 15-150 parts of epoxy resinwith phosphorous, 10-100 parts of compound curing agent and 0-5 parts of curing accelerator in the solution obtained in the step 1, stirring evenly to obtain a glue solution, selecting a flat E-glassfibic cloth, coating the glue solution evenly on the glassfibic cloth, then roasting to prepare B-stage prepreg; (3) cutting the B-stage prepreg to proper size according to the size of a pressing machine, overlying five prepregs while placing two high impact copper foils with the same size separately on the top and bottom of the prepregs, placing the prepregs with copper foils in a vacuum hot pressing machine to press and obtaining the copper clad plate. The obtained copper clad plate can meet the demand for halogen-free and flame resistance, the heat resistance and humidity resistance are excellent, and the low dielectric loss and pressing toughness are good.

The invention relates to a synthesis method of silicone-polyurethane-acrylate ternary composite ionomer emulsion as follows: first, hydroxy-terminated poly-dimethylsiloxane, N-methyl-diethanolamine, toluene diisocyanate, polypropylene glycol and others are used to prepare water-based silicone modified polyurethane; under the condition that the silicone modified polyurethane serves as emulsifier, the silicone modified polyurethane is polymerized and reacted with acrylic monomer to prepare stable silicone-polyurethane-acrylate ionomer emulsion. The silicone-polyurethane-acrylate ionomer emulsion is dried to obtain the silicone-polyurethane-acrylate coating. The synthesis method of the invention has simple process and low cost. The prepared ternary composite ionomer product combines the outstanding performances of the three components and can be applied to automobiles, household appliances, metal tools, buildings, textiles, paints and many other fields.

The invention provides a functional cellulose fiber containing graphene. The functional cellulose fiber containing the graphene is obtained by mixing graphene dispersion liquid with a cellulose spinning solution to prepare a graphene/cellulose spinning solution and then subjecting the graphene/cellulose spinning solution to wet spinning, wherein mass content of the graphene, in the graphene/cellulose spinning solution, accounting for Alpha cellulose in the graphene/cellulose spinning solution ranges from 2.0% to 6.0%. The invention further provides a preparation method of the functional cellulose fiber containing the graphene. In the graphene/cellulose spinning solution prepared by the method, uniformity in dispersion and difficulty in agglomeration of the graphene are achieved. According to the method, the step that oxidized graphene is reduced by a reducing agent in a follow-up process is omitted, so that fiber performance is improved. Content of the graphene in the functional cellulose fiber containing the graphene is 2.0-6.0%. The functional cellulose fiber containing the graphene is uniform in graphene distribution, high in temperature rise rate, excellent in far-infrared and anti-ultraviolet performance and better in thermal stability performance.

The invention relates to arc extinction slurry for a fuse protector. The arc extinction slurry comprises, by weight, 5-40 parts of gas production materials, 0-10 parts of phenol formaldehyde resin, 20-60 parts of quartz sand, 0.6-10 parts of organic solvents and15-30 parts of deionized water. The gas production materials are mainly urea-formaldehyde resin and other powder materials; the phenol formaldehyde resin can be boron-modified phenol formaldehyde resin and other high-temperature-resistant resin which is soluble in organic solvents, and the main effect of the phenol formaldehyde resin is to improve the heat-resistant performance of urea-formaldehyde resin; the periphery of a melt is covered with the arc extinction slurry in a filling mode or a thick film printing mode or the like, and gas will be produced under the action of an electric arc so as to extinguish the electric arc; fast cooling of the metallic melt is guaranteed by adding the quartz sand, and therefore the arc extinction slurry can be used on the breaking occasion of high voltage and great current of more than 250VAC/100A. The arc extinction slurry has the predominant advantages of being low in production cost, easy to operate, free of halogen, friendly to environment, high in arc extinction ability and the like, thereby being suitable for being used in a current common tube shell type or thick film printing type surface-mounted miniature fuse protector.

The invention discloses thermal-sublimation water-based intaglio printing ink and a preparation method thereof. The thermal-sublimation water-based intaglio printing ink is composed of components in percentage by weight: 15-35% of disperse dye size, 24-50% of an N-vinylamide-acrylic ester copolymer emulsion, 0.3-2.5% of a thickening agent, 0.1-2% of an antifoaming agent, 0.1-3% of a neutralizer, 0.1-0.5% of a preservative and 10-42% of de-ionized water. The thermal-sublimation water-based intaglio printing ink has high heat resistance; and transferred printing paper is not adhered to a cloth material in a transfer printing process. The thermal-sublimation water-based intaglio printing ink also has excellent storage stability; patterns printed on various transferred printing paper are clear; the printing patterns transferred onto dacron, nylon cloth material and textile have clear profiles without any friction ghosting and transfer ghosting and are bright in color; and color fastness complies with wearing requirements. The thermal-sublimation water-based intaglio printing ink has no any toxic organic solvent residue, can be diluted with water and is good for safe production and environment protection.

The invention relates to a method for preparing a polymer composite material by expanded perlite. The method comprises the following steps: mixing the expanded perlite and a polymer in a weight ratio of (2-60) to (98-60) to uniformly disperse the expanded perlite in the polymer matrix; and molding to obtain a polymer composite material product, wherein the expanded perlite is a product formed by carrying out high-temperature expansion on natural mineral perlite, and a honeycomb porous structure is formed inside the expanded perlite; and the polymer is one or more of universal plastic, engineering plastic and rubber. The polymer composite material has excellent heat-insulation and flame-retardant performances, is capable of overcoming the defect that the flame-retardant performance cannot be remarkably improved by existing clay type additives, is environmental-friendly and non-toxic, and does not cause dust pollution; and the packing is low in cost and easily available.

The invention relates to a method for continuously polymerizing chain extension modified polyester. The method mainly comprises the following steps of directly conveying polyester melt from a condensation polymerization system by a melt metering gear pump to a melt pipeline, then allowing the polyester melt and the chain extender injected into the melt pipeline by a chain extender injection device to enter a dynamic mixer, after mixing uniformly by the dynamic mixer, entering a homogenizer for chain extension homogenizing reaction so as to obtain the chain extension modified polyester melt, filtering the obtained melt by a melt filter, then transferring the filtered melt to a casting belt head for cooling and curing, and finally, pelletizing by a pelletizer so as to obtain chain extension modified polyester chips. The method for continuously polymerizing chain extension modified polyester guarantees the stability of the product quality, improves production efficiency, lowers production cost, and realizes large scale industrial production.

The invention relates the heat-durability benzoxazine resin compound and preparing method, comprising the following steps: dissolving 50-95wt% benzoxazine resin intermediate, 0-50wt% aromatic compounds liquid resin with aldehyde group and 0-50wt% benzoxazine resin with aldehyde group into solvent between room temperature and 50Deg.C, getting heat-durability benzoxazine resin compound solvent, carrying out coating or dipping technology, getting prepreg, or mixing and getting solid resin compound, forming at 150Deg.C, carrying out heat treatment at 180Deg.C, and getting the product.

The invention relates to a melamine aminotrimethylene phosphonate and a preparation method thereof. The preparation method comprises the following synthesis steps: adding measured melamine and an appropriate amount of deionized water in a reaction kettle with a stirring device, raising a temperature and stirring to obtain the completely-dissolved melamine solution, then slowly dripping aminotrimethylene phosphonic acid aqueous solution with a proper concentration, reacting for a period of time with heat, after the reaction is ended, filtering, washing and drying to obtain the target compound. The raw materials in the preparation method disclosed by the invention are melamine and aminotrimethylene phosphonic acid, rich in source and low in price; the preparation process is simple in flow and low in cost. The melamine aminotrimethylene phosphonate obtained by the preparation method disclosed by the invention is good in heat stability and good in compatibility with polymers, simultaneously has the characteristics of nitrogen-containing and phosphorous-containing flame retardants, and has high flame-retardant efficiency, wide application range (applicable to the flame retardance of many plastics, rubbers, fibres and coatings), and a wide market prospect.

The invention relates to a preparation method of a graphene oxide/nano cellulose/polyvinyl alcohol composite film. The method aims to solve the problems of poor mechanical properties and poor barrier properties of the existing degradable polyvinyl alcohol packaging film. The method comprises the following steps: 1. preparing nano cellulose; 2. preparing graphene oxide; 3. preparing a nano cellulose/polyvinyl alcohol mixed solution; 4. preparing a graphene oxide solution; and 5. preparing the composite film. The composite film has favorable mechanical properties; the tensile strength can reach 101.49 MPa which is enhanced by 42.4% as compared with the PVA (polyvinyl alcohol) film; the oxygen barrier property is enhanced by 2.08 times as compared with the pure PVA film; the thermal decomposition temperature is enhanced by 10-20 DEG C; and the composite film has higher light transmittance. The method belongs to the field of preparation of composite packaging films.

The invention relates to a nano-grade silica modified montmorillonite particle preparation method, and a method for applying the nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with an in-situ method. According to the invention, tetraethoxysilane, a silicane coupling agent and montmorillonite are subject to a modification reaction, such that anano-grade silica layer is modified on the surface of montmorillonite, and active amino-groups are modified. Therefore, the compatibility of montmorillonite in aqueous polyurethane resin is better, such that the emulsion can be more stable. According to the invention, silica modified montmorillonite is prepared through an in-situ method, a silica layer comprising a large amount of silanol is modified on the surface of montmorillonite, and lamella parts of montmorillonite are peeled. When the modified particles are positioned in an aqueous polyurethane system, high molecular chains of polyurethane are subject to an intercalation reaction with montmorillonite, such that free movements of polyurethane molecular chains are restricted, and mechanical properties and thermal stability of the material are improved. Compared to simple polyurethane, tensile strength of the material is improved by 1-2 times, and thermal decomposition temperature of the material is improved by 30 to 50 DEG C.

The invention discloses a preparation method of a boron-containing phenolic resin for friction materials, used for preparing the boron-containing phenolic resin. The method adopts a two-stage process, characterized by firstly reacting phenol with formaldehyde under the effect of acid catalysis to generate a phenolic resin with small molecular weight, and reacting the phenolic resin with small molecular weight with boric acid to generate a boron modified phenolic resin. By adjusting the ratio of raw materials, controlling the reaction temperature, time and other conditions, the boron modified phenolic resin is obtained. Various technical indicators of the boron-containing phenolic resin of the invention all meet the requirements of phenolic resin for friction materials GB/T2441-2009. Compared with the common phenolic resin, the friction materials prepared by using the boron-containing phenolic resin of the invention as a binder of friction materials have better high temperature stability of the friction coefficient and lower wear rate. The preparation method of the invention is similar to the process of the common phenolic resin, and the method is easy to popularize and apply.

The invention discloses a lithium-ion battery electrolyte taking LiBF2SO4 as basic lithium salt. The electrolyte comprises the following components: electrolyte lithium salt and an aprotic solvent, wherein the electrolyte lithium salt can be unitary LiBF2SO4 and also can be a mixture of LiBF2SO4 and other common lithium salts; the aprotic solvent is one or a mixture of some of common carbonic ester, sulphite, sulfone compounds and the like. Through the lithium-ion battery electrolyte, disclosed by the invention, the compatibility between the electrolyte and the electrode materials can be improved; meanwhile, the rate performance, the high-temperature performance and the cycle performance of the lithium-ion battery can be effectively improved.

The embodiment of the invention discloses a modified phenolic resin. Phenolic resin is modified by adopting tung oil and nano particles, wherein the tung oil accounts for 10-15 wt% of the weight of the phenolic resin, and the nano particles account for 20-45 wt% of the weight of the phenolic resin. The thermal decomposition of the phenolic resin is remarkably increased by comprehensive modification on the phenolic resin, and a brake pad including the phenolic rein has stable braking performance and less heat fading during emergent braking at high speed. The invention also discloses a preparation process of the modified phenolic resin, a brake pad cementing agent, a preparation process thereof, and a brake pad using the brake pad cementing agent as a cementing agent.