131results about How to "High hydroxyl content" patented technology

The present invention discloses preparation process of hydrophilic paint for heat exchanger aluminum foil of air conditioner. The paint consists of one kind of base paint, and one kind of top paint. The base paint consists of hydroxyl emulsion 15.0-20.0 wt%, amino resin 1.5-3.0 wt%, cross-linking assistant 0.05-0.5 wt%, color paste 1.5-2.5 wt%, and mixed solvent for the rest. The top paint includes two components, component A and component B, in the weight ratio of 9.0-11.0 to 1, the component A consists of hydrophilic polymer 25.0-35.0 wt%, hydrophilic reinforcer 5.0-10.0 wt%, surfactant 0.5-3.5 wt%, and mixed solvent for the rest; and the component B consists of curing agent 60.0-65.0 wt% and deionized water 35.0-40.0 wt%. The paint of the present invention has high adhesion, high hydrophilicity, and capacity of forming very thin coating to ensure the heat exchange performance of the heat exchanger.

The invention discloses an aqueous colored transparent heat insulation coating, and a preparation method and a use method thereof. The aqueous colored transparent heat insulation coating is composed of a water-soluble hydroxy acrylic resin, an aqueous nanometer antimony-doped tin dioxide (ATO) slurry, an aqueous nanometer hydrotalcite slurry, an amino resin, an aqueous color paste, a film forming assistant, deionized water, a dispersant, a wetting agent, a pH adjusting agent, an antifoaming agent, an anti-settling slurry, a thickening agent, an adhesion accelerant and a leveling agent. The preparation method is characterized in that above substances are mixed under specific conditions to obtain the coating. The use method is characterized in that the addition amount of the amino resin is 4-8wt% when the coating is used as a single-component baking varnish; and the addition amount of the amino resin is 0 when the coating is used as a two-component air-dried paint. The coating has the advantages of very good adhesion, high hardness, excellent ageing resistance and good heat insulation effect on the surfaces of glass, plastic films and the like.

The invention discloses an unsaturated polyester resin with high cohesive force and high wettability and a preparation method for the unsaturated polyester resin, and belongs to the technical field of unsaturated polyester resins. The unsaturated polyester resin with high cohesive force and high wettability comprises the following components in percentage by weight: 28 to 33 percent of dibasic alcohol, 30 to 40 percent of dibasic acid or acid anhydride, 30 to 35 percent of diluent and 2 to 4 percent of glycerol. The unsaturated polyester resin obtained by the process according to the formula has high wettability and cohesive force, and has a good and quick effect of wetting glass fiber; and the cohesive force is subject to pressure and shear force tests, is increased by over 30 percent compared with an ordinary o-phthalate resin, and is over 20MPa. When quartz stone boards are produced, the average using amount of the resin of each board can be reduced from 25KG to 23KG; and the caking is difficult in the stirring process of the resin and quartz sand, so that the spreading and pressing are easier during production of manufacturers, the phenomena of deformation, cracking and the like which appear in the convention manufacturers can also be further improved, and the thixotropic property of the resin and gaseous silicon can be greatly improved additionally.

The invention discloses a cold core box binder and a casting molding body and belongs to the technical field of binders. The cold core box binder comprises a first component. The first component is composed of, by weight, 40-80 parts of benzyl ether phenolic resin, 1-50 parts of high-boiling-point ester and / or hydrocarbon solvents and 0.1-10 parts of tackifying auxiliaries, wherein the content of hydroxymethyl of the benzyl ether phenolic resin is 32%-50%. According to the cold core box binder, the resin using amount is decreased to 0.55%-0.75% under the condition that the strength of a resin sand mold core is ensured; compared with the prior art, the resin using amount is greatly decreased, and the collapsibility of the resin sand mold core is greatly improved; and meanwhile, the residual quantity of tar on a metal mold is decreased, and the production efficiency is improved.

The invention relates to a biorefinery method of wood fiber material, comprising the following steps of: (1) crushing and screening material so as to obtain long fiber, short fiber and powder; (2) adopting the two-step method of alkaline treatment and oxidation treatment to treat the long fiber obtained by the step (1) and preparing into pulp; and / or implementing synchronous diastatic fermentation on the short fiber and powder obtained by the step (1) and ultra-fine fiber and part of accepts obtained by the step (2) and preparing into alcohol. In the method, black liquid after alkaline treatment is prepared into alkali lignin; and the black liquid after oxidation treatment recovers the solvent and the oxidized lignin is prepared. The method can comprehensively utilize the wood fiber material to produce pulp, alcohol and lignin products. The obtained pulp has higher yield and better pulp performance compared with the sulfate pulp with the same material. The pulp can obtain higher enzymolysis rate with less usage of cellulose. The method has no sulfur and chloride elements, simultaneously reduces discharge of wastewater and has good environment friendliness.

The invention provides an anti-fog self-cleaning film and a method for preparing the same. The film is characterized in that: Fe2O3, SiO2 and TiO2 are mixed to form a ternary inorganic nanometer composite sol according to the molar ratio of (0.1-0.4):(10-40):100, and a water soluble macromolecular substance of which the molecular weight is between 400 and 10,000 is added to the composite sol according to the concentration of (0.1-4.0)g.L. The anti-fog self-cleaning film can achieve the advantages of super-hydrophilicity, strong hydrophilic retention capability, high transmittance, high photocatalytic activity, high capability of adhering to base materials, and good anti-fog self-cleaning effects.

The invention discloses a metronidazole modified graphene oxide composite material. A preparation method of the metronidazole modified graphene oxide composite material comprises the following steps of (1) preparing graphene oxide; (2) stirring and dissolving maleic anhydride into an oil bath pan at a temperature of 75 DEG C, adding the graphene oxide into the dissolved maleic anhydride to reach for 3 h, then adding distilled water and heating up to 86 DEG C to react for 16 h, and finally performing suction filtration, washing, drying and grinding treatments to obtain maleic anhydride modified graphene oxide; (3) dispersing the maleic anhydride modified graphene oxide in dimethyl formamide, then adding metronidazole, dicyclohexyl diimine and 4-dimethylamino-pyridine, and reacting at a temperature of 80 DEG C under the protection of nitrogen gas for 48 h so as to obtain the metronidazole modified graphene oxide composite material. The metronidazole modified graphene oxide composite material has the advantages that the composite material is prepared from conventional materials under mild conditions, and is added into a coating, so that the excellent properties of the composite material and the coating are fully exerted, and the pollution to environment is reduced.

The present invention discloses a method for preparing an esterified starch film former for glass fiber wetting, and the method is characterized in that the product of the esterified starch film former for glass fiber wetting is obtained by: placing corn starch into a reactor, adding water, heating to a temperature of 70-90 DEG C under stirring, reacting for 0.5- 2h, and cooling to 30-60 DEG C; adjusting a pH value to 4-7, adding isoamylase, after reacting for 0.5-6h, heating to a temperature of 80-90 DEG C for 20 min for enzyme deactivation, and filtering to remove the enzyme and obtain a reaction solution; and cooling the reaction solution to a temperature of 25-55 DEG C, adding an acid anhydride, adding an alkaline catalyst, maintaining the pH value being 7-10, reacting for 2-10h, adjusting the pH value to be 6-7, cooling to the room temperature, suction filtering, and drying a solid. The product of the film former has the advantages of a good film forming property and an easy post-treatment process, and has excellent effects of bundling and protecting the glass fiber in the production process of the glass fiber.

The invention discloses a method for preparing a reinforced phenolic aldehyde-epoxy resin composite material by utilizing hollow glass bead-carbon fiber sheet-glass fiber. The method comprises the steps of putting epoxy resin into a heating sleeve, and stirring to form a water type; adding glass fiber modified by a plasma; mechanically stirring and mixing in a stirrer; carrying out ultrasonic treatment in water bath, and fully mixing; adding a hollow glass bead surface-treated by a curing agent, an accelerant and a silane coupling agent, and a carbon fiber sheet reinforced phenolic aldehyde-epoxy resin composite material, and carrying out ultrasonic treatment in water bath; using a vacuum pump for vacuumizing, pouring into a mold, continuously vacuumizing, putting into a drying oven, heating, curing, cooling to the room temperature, and obtaining the reinforced phenolic aldehyde-epoxy resin composite material. A sodium hydroxide solution is adopted for pretreating the surface of the hollow glass bead, so that the hydroxy content of the surface is improved, and the reaction activity of the silane coupling agent and the hollow glass bead is improved; the compression performance, thetensile property and the bending property of the composite material prepared from the modified hollow glass bead can be improved.

The invention relates to a paint with low VOC (Volatile Organic Compound) for an aircraft and a preparation method thereof. A component A of the paint is HDT-LV2 produced by the French Rhodia Company and has a nonvolatile matter content of 100 percent by weight; a component B of the paint consists of the following components in percentage by weight: 20-60 percent of caprolactone monomer modified hydroxyl polyester resin, 3-15 percent of polycaprolactone polyol resin, 5-50 percent of paint, 1-3 percent of dispersant, 0.1-1 percent of composite flatting agent, 0.05-0.15 percent of acetylacetonetype catalyst, 0.1-0.4 percent of hinderdeamine type light stabilizer, 0.2-0.6 percent of polyolefin wax type anti-settling auxiliary agent and the balance of mixed solvent; and the mixing ratio of the component A to the component B is (0.8-1.5):1 according to the molar ratio of NCO to OH. Comprehensive performance of the paint can meet requirements of aircraft industry and the paint has low construction VOC.

The invention discloses nano-sol for forming an anti-aging and stain-resistant nano-coating and a preparation method thereof. The nano-sol for forming the anti-aging and stain-resistant nano-coating comprises the following components in percentage by weight: 0.1-10% of nano-TiO2 sol, 0.1-20% of sodium silicate, 0.1-5% of cerium oxide sol, 0-0.1% of colorant and the balance of water or mixed solution consisting of ethanol and water. The preparation method comprises the steps of firstly preparing the nano-TiO2 sol by adopting a sol-gel method, then preparing the Ce2O3 sol, then adding sodium silicate and the Ce2O3 sol into the nano-TiO2 sol, uniformly stirring, further adding the colorant, and finally adding the balance of water or the mixed solution consisting of ethanol and water to obtain the nano-sol for forming the anti-aging and stain-resistant nano-coating. The nano-coating which is used for a color-coated plate and obtained by coating has the properties of aging resistance, stain resistance, corrosion resistance and the like, and the service life of the color-coated plate can be prolonged.

The invention discloses special single-component jointing and gap filling silicon rubber for curing EMAS at room temperature and a preparation method of the special single-component jointing and gap filling silicon rubber. Low-viscosity alpha, omega-dihydroxy-polydimethylsiloxane is used as base rubber, linear polydimethylsiloxane is used as an additive, the hydroxyl content is increased, a fumed silica is adopted for reinforcing, a mixture of aluminum hydroxide and melamine cyanurate is used as flame-resistant filler, methyltris(methylethylketoxime)silane and tri(2-butaneneoxime)cinylsilane are used as crosslinking agents, aminopropyltriethoxysilane and gamma-methacryloxypropyltrimethoxysilane are used as adhesives, a production process is controlled, and then, the special single-component jointing and gap filling silicon rubber for curing EMAS at room temperature, which is good in flowability, capable of rapidly curing, good in flame retardance, moderate in strength and good in adhesive strength, is obtained, so that the application requirement of an EMAS system is met.

The invention relates to high polymer ester calcium and a synthesis method thereof. According to the invention, the high polymer ester calcium is calcium salt of pentaerythritol adipate formed by carrying out esterification reaction on adipic acid and pentaerythritol, adding a solid superacid as a catalyst and adding calcium oxide or calcium hydroxide to neutralize. The high polymer ester calcium, provided by the invention, has excellent comprehensive performance, when the high polymer ester calcium is used for a PVC (Polyvinyl Chloride) stabilizing system, the initial whiteness of obtained products, Congo red times, system compatibility, stability and the like are very outstanding, and the preparation method is simple so as to achieve industrial productions, and the high polymer ester calcium can be used for preparing a PVC stabilizing agent.

The invention relates to the technical field of an organic silicon industry and provides a preparation method of low-polymerization degree hydroxyl-terminated fluorosilicone oil. The preparation method solves the problem that the existing preparation technology of low-polymerization degree hydroxyl-terminated fluorosilicone oil produces a complex mixture of a linear polymer and a cyclic siloxane. The low-polymerization degree hydroxyl-terminated fluorosilicone oil is a hydroxyl-terminated 3,3,3-trifluoropropylmethylsiloxane oligomer. The low-polymerization degree hydroxyl-terminated fluorosilicone oil obtained by the preparation method has an average polymerization degree of 1 to 5, high hydroxyl content, high purity and very low cyclic siloxane content, wherein the lowest cyclic siloxane content is 0.

The invention belongs to the field of organic synthesis, and relates to a macromolecular polymerization technology, in particular to adhesive resin for an outer layer of an aluminum-plastic film of alithium battery as well as preparation and application of the adhesive resin. The adhesive resin for the aluminum-plastic film of the lithium battery is solvent-type bi-component adhesive resin and iscomposed of polyhydroxy epoxy chain-extended polyester serving as a component A and polyisocyanate serving as a component B, wherein the mass ratio of the component A to the component B is 1: 2-20: 1. The prepared adhesive is used for bonding metal aluminum foil, a PA film and a PP film, and the prepared aluminum-plastic film has high flexibility, tensile resistance, hydrolysis resistance, heat resistance, cohesiveness and impact resistance. The adhesive product prepared by the invention can completely meet the application performance requirements of the lithium battery aluminum-plastic filmadhesive.

The invention relates to a preparation method of a hydrophilic SiO2 aerogel. The preparation method comprises the following specific steps of: evenly mixing a silicon source, an organic acid and de-ionized water together in a fixed volume ratio and stirring; then, carrying out a sol-gel process by using ammonia water with an appropriate mass concentration; aging and preparing the SiO2 aerogel with excellent hydrophilic performance by using CO2 supercritical drying technology. The obtained aerogel has a specific surface area in the range from 650 to 800 m<2> / g, a pore volume in the range from 2.5 to 3.5 cm<3> / g, a mean pore size in the range from 35 to 60 nm and a water regaining ability in the range from 6 to 8 ml / g. The preparation method has the advantages that the SiO2 aerogel with excellent hydrophilic performance is prepared by using an acidic, hydrophilic organic acid instead of ethanol as a solvent, so that the hydrophilic performance of the aerogel is improved while excellent properties of the aerogel are maintained, simultaneously, the organic acid is closely bonded with surface hydrogels of the hydrophilic SiO2 aerogel, so that chemical adsorption can be taken during adsorption to alkaline gases (like NH3), and therefore, complete combination of physical adsorption and chemical adsorption is realized and the application range of the SiO2 aerogel in gas adsorption is expanded.

The invention provides an ecological restoration method for a black and odorous riverway. The method comprises the following steps: (1) rapidly and fully stirring bottom mud, putting a mineral bottommud ecological restoration material into a water body and stirring the bottom mud at the same time for uniformly dispersing the material in the bottom mud, standing the mixture for 1-3 days, then adding bacterial sludge powder into the water body and stirring the water body, thus completing bottom mud restoration after 3-5 days of microbial degradation; (2) using an aeration oxygenation method forincreasing dissolved oxygen in the water body, and then arranging carbon fiber ecological grass in the water body; and (3) planting aquatic plants in the water body to absorb organic matters and heavy metal pollution in the water body, putting benthic organisms into the water body to construct a benthic ecosystem, and finally putting fishes into the water body to control the growth of algae in the water body. According to the method, the inorganic mineral material and the bacterial sludge powder are adopted for ecological restoration of the bottom mud, then the water body habitat and the water body ecological system are sequentially constructed, comprehensive restoration of the bottom layer, the water body and the environment of the riverway is completed, treatment is thorough, and the treatment efficiency is high.

The invention discloses a synthesis method of a double-end hydroxy polyphenylene ether oligomer. In the synthesis method of the double-end hydroxy polyphenylene ether oligomer, the double-end hydroxypolyphenylene ether oligomer is obtained by taking a metal-polyethyleneimine complex as a catalyst through an oxidative copolymerization reaction of monohydric phenol and dihydric phenol. According tothe synthesis method, the metal-polyethyleneimine complex is used as the catalyst, the catalytic activity is milder, the reaction between the dihydric phenol and the monohydric phenol can be effectively promoted, the hydroxyl content of the product is increased, and the residue of the dihydric phenol monomer of the product is simultaneously reduced and the product quality is improved. The double-end hydroxy polyphenylene ether oligomer prepared by the invention can be used as an additive and a copolymerization block of other thermoplastics, thermoplastic elastomers and thermosetting materialsto improve the thermal property, adhesive force, mechanical property and chemical resistance and electrical property of the material.

The invention provides a preparation method of a polyvinyl acetal solid electrolyte. The preparation method comprises the steps of respectively reacting polyvinyl formal or a homologue of polyvinyl formal and polyvinyl alcohol with boric acid, oxalic acid and lithium salt in an organic solvent system step by step, performing mixing in proportion, performing washing, suction filtration and drying, synthesizing high-purity polymer lithium salt with a lithium mono(oxalato) borate structure grafted on a polymer molecular chain, dissolving the high-purity polymer lithium salt in an organic solvent to form a settled solution, and finally preparing the solid electrolyte. The solid electrolyte prepared by the method has lithium ion migration number approximate to 1, excellent room-temperature conductivity greater than or equal to 10<-4>S / cm, a wide electrochemical stability window greater than or equal to 6V(vs.Li / Li<+>), outstanding thermal stability, high tensile strength greater than or equal to 35MPa, and excellent comprehensive performance for an all-solid battery system.

The invention discloses a surface modification method of spherical aluminum oxide for a high-strength epoxy molding compound. The method comprises the following steps: firstly, carrying out hydroxylation treatment on spherical aluminum oxide, then carrying out surface treatment on the hydroxylated aluminum oxide by using a silane coupling agent, and finally carrying out heat treatment on the surface-modified aluminum oxide at the temperature of 250-300 DEG C to obtain the spherical aluminum oxide for the epoxy molding compound. The spherical alumina prepared in the invention has excellent compatibility with epoxy resin, high shore hardness, high bending strength and good moisture resistance.

The invention relates to a medium / high-solid hydroxy acrylic resin which is characterized by comprising the following components in parts by weight: 10-30 parts of methyl methacrylate, 5-20 parts of butyl methacrylate, 5-15 parts of butyl acrylate, 5-15 parts of hydroxyethyl methacrylate, 5-20 parts of styrene, 0.5-2.0 parts of methacrylic acid, 2-5 parts of acrylonitrile, 0.5-1.5 parts of di-tert-pentyl peroxide, 20-35 parts of dehydrated petroleum dimethylbenzene and 5-15 parts of butyl acetate. According to the preparation method, the hydroxy acrylic resin is synthesized by using a new polymerization technique. The medium / high-solid hydroxy acrylic resin synthesized by using the new polymerization technique has the advantages of excellent weather resistance, excellent gloss retention, excellent fullness, excellent decorative performance, excellent comprehensive physiochemical properties and excellent compatibility.

The invention discloses an aqueous metal anticorrosive coating, and relates to the technical field of coatings, the aqueous metal anticorrosive coating comprises the following raw materials by weight:70-80 parts of acrylic resin, 10-18 parts of amino resin, 7-15 of aqueous epoxy resin emulsion, 3-7 parts of modified graphene, 2 to 5 parts of attapulgite, 2 to 5 parts of bentonite, 1 to 3 parts ofnano-silica, 2 to 4 parts of potassium titanate whisker, 1 to 3 parts of barium sulfate, 0.5-2 parts of a silane coupling agent, 1-3 parts of dicumyl peroxide, 2-5 parts of polyvinyl alcohol, 0.5-2 parts of sodium dodecyl diphenyl ether disulfonate, 0.5-2 parts of ethyl acetate, 2 to 6 parts of dipropylene glycol monobutyl ether, 0.5 to 2 parts of polyethylene wax, 0.5 to 2 parts of hydroxypropylmethylcellulose, 0.2 to 1 part of a leveling agent, 0.2-1 part of a defoamer, 1-3 parts of an anti flash rust agent and 10-20 parts of deionized water. The aqueous acrylic resin is used as a main film-forming substance, the amino resin and the aqueous epoxy resin emulsion are added for modifying, the modified graphene, the potassium titanate whisker and the like are added, and the obtained coating has excellent water resistance and acid-base corrosion resistance, and can extend the life of a metal.

The invention discloses a double-component hydrophobing agent and application thereof. The hydrophobing agent contains a component A and a component B, wherein the component A is a hydroxy-rich ethyl orthosilicate hydrolysis solution; and the component B is a perfluoro solvent solution in which long-chain fluoroalkyl silane is dissolved. By adopting the double-component formula, after the component A, which is the hydroxy-rich ethyl orthosilicate hydrolysis solution, reacts with the glass surface, the hydroxy content of the glass surface can be enhanced, thereby increasing the active reaction sites with low-surface-energy substances; the component B is the perfluoro solvent solution in which long-chain fluoroalkyl low-surface-energy silane is dissolved, and the perfluoro solvent can improve the solubility of the long-chain fluoroalkyl low-surface-energy silane, thereby preventing polymerization and crystallization; and the perfluoro solvent is hardly soluble in water, thereby avoiding water in the system and enhancing the reaction density between the long-chain fluoroalkyl low-surface-energy substances and the hydroxy group on the glass surface. The double-component formula can greatly enhance the durability of the hydrophobic film layer.

The invention provides a preparation method of a manganese-containing catalyst for removing formaldehyde at room temperature. The catalyst takes modified activated carbon as a carrier; the catalyst isprepared by taking manganese dioxide as a main active center and the modified activated carbon as the carrier, loading a manganese-containing active component on the activated carbon carrier throughan immersion method and drying at low temperature and roasting at high temperature under an inert gas atmosphere. According to the preparation method, high-dispersity manganese oxide is used as an active substance for the first time; and the ozone modified activated carbon is used as the carrier and is applied to synthesis of air purification catalyst materials. The manganese-containing catalyst provided by the invention can be used for realizing catalytic oxidization of the formaldehyde and can be applied to the field of air purification.

The invention discloses a method for preparing cellulose acetate butyrate with a high hydroxyl content. The method comprises the following steps: cellulose activation, cellulose esterification and cellulose hydrogenolysis to obtain cellulose acetate butyrate with the hydroxyl content of 4-6 wt%. The method removes acyl groups of the cellulose acetate butyrate by adopting a hydrogenolysis process to obtain high-content hydroxyl groups, so a large amount of acid wastewater generated by hydrolysis through adding water is avoided, the reaction time is remarkably shortened, the production cost is greatly reduced, and the method is suitable for industrial production.

The invention discloses a preparation method of hydroxymethylated lignin with microwave assist. The method comprises the following steps: dissolving lignin in an alkaline solution, adjusting pH to be 9-12, adding a certain amount of a formaldehyde solution while performing uniform stirring, putting the obtained mixed solution in a microwave reactor, carrying out a reaction at a certain temperature in a range of 70-90 DEG C for 15-45 min, performing cooling to the room temperature, adding acid for precipitation, and performing filtration, washing and drying to obtain hydroxymethylated lignin. The hydroxymethylated lignin is prepared through microwave-assisted heating. The method is short in reaction time, low in energy, and increased in hydroxyl group content of lignin. The method is beneficial for further application of lignin and has bright application prospects.

The invention relates to a polyurethane foam, especially to a polyurethane foam with organosilicon modified expanded graphite as a flame retardant. The polyurethane foam must contains organosilicon modified expanded graphite. The polyurethane foam further comprises polyester polyol, 1,4-cyclohexane diisocyanate, hydroxyl-terminated fluorosilicone resin, stannous octoate, triethylenediamine, a surfactant, an antioxidant and a drier. The polyurethane foam of the invention has the following beneficial effects: (1) good flame retardant effect; (2) low addition amount of the flame retardant; (3) good heat preservation effect; (4) no residual raw material inside the foam and no harm to the human body.

The invention discloses a high-heat-resistant high-toughness low-dielectric-constant fluorenyl benzoxazine resin composition and a preparation method thereof. The high-heat-resistant high-toughness low-dielectric-constant fluorenyl benzoxazine resin composition is characterized in that the resin is a mixture of resin, an inorganic filler, an accelerator and a solvent, wherein a weight ratio of theresin to the inorganic filler to the accelerator to the solvent is 100:(30-70):(0.01-1):(57-80); the resin is a mixture of benzoxazine resin, DCPD epoxy resin and phosphorus-containing phenolic resin, wherein a weight ratio of the benzoxazine resin to the DCPD epoxy resin to the phosphorus-containing phenolic resin is 100:(40-80):(10-40); and the benzoxazine resin is one or more selected from high-heat-resistant high-toughness low-dielectric-constant fluorenyl benzoxazine resin and other benzoxazine resin, wherein a weight ratio of the high-heat-resistant high-toughness low-dielectric-constant fluorenyl benzoxazine resin to the other benzoxazine resin is (60-100):(0-40). The composition provided by the invention is used in the fields of laminated boards, integrated circuit packages, high-frequency high-speed copper-clad boards and high-density internet, and has excellent heat resistance, a lower dielectric constant and dielectric loss factor, better flame retardancy and bending strength, a lower water absorption ratio and the like.

The invention provides a preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal. The preparation method comprises the following steps: 1) crushing, grinding and drying a biomass raw material; 2) carrying out soaking treatment on the dried biomass into a blended soaking solution, and carrying out centrifugal dehydration drying; 3) putting charcoal into an acid solution, carrying out stirring at a uniform speed at the room temperature, and carrying out centrifugal dehydration drying so as to obtain acid pickled charcoal; 5) under protection of an argon environment, putting the acid pickled charcoal into an iron solution, carrying out stirring for 1 hour at the room temperature, and dropping a NaBH4 solution to carry out a reaction; and 6) after the reaction is completed, carrying out centrifugal dehydration drying, so as to obtain the acid pickled ZVI modified charcoal. The acid pickled ZVI modified charcoal prepared by using the preparation method has a remarkable repairing effect on heavy metal Cr (VI) polluted soil, is capable of effectively reducing the content of Cr (VI) in the soil, and in addition is capable of effectively degrading bio-availability and migration of chromium in the soil.