187 results about "Dibenzoyl Peroxide" patented technology

The invention relates to a counter hot melt adhesive material with high viscosity, and belongs to the technical field of hot melt adhesives. The counter hot melt adhesive material with high viscosity provided by the invention is prepared from the following raw materials in parts by weight: 41.5 to 42.5 parts of TPU, 55.5 to 56.5 parts of EVA and 1 to 3 parts of functional aids, and the functional aids comprise POE-g-MAH, a tackifying system, nano boron nitride with the surface grafted with a silane coupling agent, an antioxidant 1076, dibenzoyl peroxide, epoxy-terminated silicone oil and white mineral oil. According to the counter hot melt adhesive material provided by the invention, all the components cooperate with one another, so that the counter hot melt adhesive material can still keep relatively high viscosity in a humid and hot environment, and the requirements of practical application are met.

The invention provides a heat-conducting water-blocking sealant, a preparation method thereof and a photovoltaic module. The heat-conducting and water-blocking sealant is prepared from the following raw materials in parts by mass: 50 to 100 parts of methyl vinyl siloxane, 50 to 100 parts of lignin, 10 to 50 parts of diamond particles and / or diamond alloy particles, 0.5 to 10 parts of a first cross-linking agent, 0.5 to 10 parts of a second cross-linking agent, 0.5 to 5 parts of a coupling agent and 0.05 to 1 part of a catalyst, wherein the first cross-linking agent is prepared from one or more of dicumyl peroxide, benzoyl peroxide, toluene diisocynate and hexamethylene diisocyanate; the second cross-linking agent comprises polymethylhydrosiloxane. The heat-conducting and water-blocking sealant disclosed by the invention has relatively good heat-conducting property, water-blocking property and electrical insulation property.

The invention discloses an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer and a preparation method thereof, and belongs to the field of polymers. Comprising the following steps: putting a mixture containing an initiator, a chain transfer agent, a solvent and vinyl acetate into a closed container, introducing ethylene gas, and carrying out pressurized polymerization to obtain the ethylene-vinyl acetate copolymer, the initiator is selected from at least one of lauroyl peroxide, benzoyl peroxide, azodiisobutyronitrile and azobisisoheptonitrile; the chain transfer agent is selected from the group consisting of 2-dimethylaminoethyl acetate and / or 2-dimethylaminoethyl propionate. The preparation method of the low-branching-degree EVA has the characteristics of mild conditions, strong controllability, simplicity in operation and large-scale application prospect. The invention also provides an ethylene-vinyl alcohol copolymer prepared from the prepared EVA through alcoholysis reaction, and the ethylene-vinyl alcohol copolymer has the characteristics of high molecular weight, narrow distribution, good appearance and the like, and meets the application requirements of commercial EVOH.

The invention discloses cold-resistant and tear-resistant coating resin and a preparation method thereof, and relates to the technical field of coatings. The invention discloses cold-resistant and tear-resistant coating resin. The invention relates to a water-based paint, which is prepared from the following raw materials in parts by weight: 40 to 60 parts of modified epoxy resin, 15 to 25 parts of poly (hexanediol adipate), 5 to 10 parts of modified nano silicon dioxide, 8 to 15 parts of diphenylmethane diisocyanate, 3 to 8 parts of trimethylolpropane, 10 to 20 parts of methyl methacrylate, 8 to 15 parts of butyl acrylate, 0.5 to 2 parts of benzoyl peroxide and 0.2 to 0.8 part of dibutyltin dilaurate. The invention relates to an anti-aging coating which comprises the following components in parts by weight: 20-30 parts of a silane coupling agent, 1-3 parts of a silane coupling agent KH-550, 0.3-1 part of an anti-aging agent 264, 5-12 parts of dioctyl phthalate and 20-35 parts of a mixed organic solvent. The raw materials are scientifically proportioned, and the cold resistance and tear resistance of the coating are remarkably improved through the synergistic effect of the modified epoxy resin and the modified nano silicon dioxide; water is strictly controlled in the whole process, side reaction is avoided, and stable resin structure is guaranteed; the preparation steps are clear and definite, the repeatability is high, the solvent system adaptability is good, construction is convenient and fast, and the method is suitable for base material protection in various low-temperature scenes.

A foaming cleansing composition includes 2.5% to 12.0% Benzoyl Peroxide, at least one acrylate polymer, Hyaluronic Acid, Niacinamide, a combination of anionic and amphoteric surfactants, expressly excluding alkyl polyglucosides, and water. The composition provides a unique textural feel as compared with existing benzoyl peroxide containing products, and in particular, is formulated as a light mousse-type architecture with viscosity which is retained on skin upon application and resists dripping, even in the shower. The composition is shelf stable and stable on application, demonstrating a viscosity of about 18-25 UD (Viscosity Rheomat M3 Spindle), and a pH about 5.5 to about 6.5.

The invention relates to the technical field of cables, and discloses a halogen-free flame-retardant control cable. The halogen-free flame-retardant control cable sequentially comprises a plurality of wire cores, an insulating layer, a shielding layer and an outer protection layer from inside to outside, wherein the outer protection layer is formed by extruding a flame-retardant polyethylene composite material outside the shielding layer; the flame-retardant polyethylene composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of linear low-density polyethylene, 8 to 12 parts of compatilizer, 8 to 15 parts of modified flame retardant, 0.3 to 0.5 part of dibenzoyl peroxide, 1 to 3 parts of lubricant and 0.5 to 1.5 parts of antioxidant; wherein under the condition that the addition amount of the introduced modified flame retardant is relatively small, the flame retardant property of the cable can still be remarkably improved.

The invention provides an edge-corrosion-resistant auxiliary agent for a cathode electrophoretic coating and a preparation method of the edge-corrosion-resistant auxiliary agent, and belongs to the technical field of cathode electrophoretic paints.The preparation method comprises the following steps that amino-terminated nitrile rubber and polypropylene glycol diglycidyl ether are subjected to an addition reaction in a solvent, and epoxy resin modified amino-terminated nitrile rubber is obtained; mixing the epoxy resin modified amino-terminated nitrile rubber with a solvent, adding a mixture of the solvent and benzoyl peroxide into the mixture, and carrying out polymerization reaction to obtain repolymerized epoxy resin modified amino-terminated nitrile rubber; and sequentially adding acid water and deionized water, and stirring to obtain the edge corrosion resistant auxiliary agent. According to the cathode electrophoretic paint, the amino-terminated nitrile rubber is modified by the polypropylene glycol diglycidyl ether, so that the mechanical property and the flexibility of the cathode electrophoretic paint are improved; and then benzoyl peroxide is used for initiating repolymerization of the epoxy modified nitrile rubber to reduce the fluidity of the electrophoretic paint in the baking process, so that the edge corrosion resistance of the cathode electrophoretic paint is improved.

The invention provides a bi-component spun-bonded non-woven fabric and a production process thereof, and belongs to the technical field of non-woven fabrics. The non-woven fabric is composed of bi-component fibers of a skin-core composite structure, the skin layer of the bi-component fibers is composite polypropylene, and the core layer of the bi-component fibers is polycaprolactam; the preparation method of the composite polypropylene comprises the steps of polypropylene hydrophilic treatment, starch functional treatment and compounding. The hydrophilic treatment of polypropylene comprises the following steps: adding benzoyl peroxide, an antioxidant and ethylene bis stearamide into polypropylene, stirring for 20-25 minutes, adding polyethylene glycol monoallyl ether, stirring for 10-15 minutes, adding polyethylene glycol monoallyl ether again to obtain a polypropylene mixture, putting the polypropylene mixture into a twin-screw extruder, carrying out melt extrusion, and carrying out extrusion molding to obtain the polypropylene material. Hydrophilic polypropylene is obtained; the non-woven fabric is high in water absorption rate, short in liquid penetration time and excellent in strength and chemical stability resistance.

The invention relates to a pharmaceutical composition, which is prepared from adapalene, benzoyl peroxide, a traditional Chinese medicine extract, an acrylamide and acryloyl dimethyl sodium taurate copolymer, a mixture of isohexadecane and polysorbate 80, docusate sodium, EDTA (Ethylene Diamine Tetraacetic Acid) disodium, glycerol, poloxamer 124, propylene glycol and water, the traditional Chinese medicine extract comprises moutan bark, salvia miltiorrhiza, radix rehmanniae recen, radix sophorae flavescentis, coptis chinensis, rheum officinale, scutellaria baicalensis, menthol and borneol. According to the pharmaceutical composition disclosed by the invention, the synergistic antibacterial and anti-keratosis curative effects of adapalene and benzoyl peroxide can be maintained, and meanwhile, the occurrence rate of local skin dryness, erythema, desquamation, burning heat sensation and contact dermatitis can be remarkably reduced.

The invention discloses an acrylic acid silane ester self-renewal antifouling resin based on cation-pi interaction as well as a preparation method and application of the acrylic acid silane ester self-renewal antifouling resin. Methyl methacrylate, ethyl acrylate, triisopropylsilyl methacrylate, acrylic acid-2-methyl ethyl ester, paeonol methacrylate and acryloyloxyethyl trimethyl ammonium chloride are synthesized through a random free radical polymerization reaction with azodiisobutyronitrile and benzoyl peroxide as initiators. Wherein the methacrylic acid paeonol ester monomer is prepared by carrying out substitution reaction on paeonol and methacryloyl chloride. The anti-fouling agent is anchored on the surface of the coating again through cation-pi interaction, so that the anti-fouling effect is enhanced, and the coating still has good anti-fouling capacity even in a static environment.

This invention relates to a polyurethane-modified silicone protective material for the outer wall of wind turbine towers, and discloses a method for preparing the same material. The material is prepared by mixing acrylate-hedged phenol-modified trimethyl silicone oil, isocyanate-modified polyether polyol polyurethane, ultrafine silica, nano-alumina, short-fiber glass, triethylamine, benzoyl peroxide, dioctyl phthalate (DOP), phthalocyanine UV absorbers, dibutyltin diethylene (DDBT), and imidazole antifungal agents in a specific weight ratio. This material exhibits excellent weather resistance, mechanical strength, heat resistance, UV resistance, and antifungal properties, making it particularly suitable for the protection of wind turbine towers. The preparation method ensures the stability and consistency of the material's performance by precisely controlling the proportions of each component and the curing conditions. This material effectively improves the UV resistance, corrosion resistance, weather resistance, and overall durability of wind turbine towers, extending their service life and reducing maintenance costs. This invention provides a high-performance protective material for the outer wall of wind turbine towers, which has significant engineering application value. Especially in environments with long-term high humidity, low temperature, and strong ultraviolet radiation, it can significantly improve the stability and service life of the tower. This polyurethane-modified silicone protective material exhibits excellent protective performance in demanding application environments such as wind turbine towers, and has broad market application prospects.

The invention provides yellow glue resistant to corrosion of a plasticizer and a preparation method of the yellow glue. The yellow glue is prepared from a polyurethane prepolymer, a chloroprene rubber sheet, methyl methacrylate, benzoyl peroxide, an anti-aging agent, butanone, cyclohexane, dimethyl carbonate and tackifying resin. The polyurethane prepolymer is prepared from the following components in parts by weight: 10 to 14 parts of 1, 4-butanediol adipic acid polyester polyol, 4 to 8 parts of polycaprolactone polyol, 1 to 3 parts of diphenylmethane diisocyanate, 0.05 to 0.15 part of 1, 6-hexanediol, 1 to 2 parts of hydroxyethyl methacrylate, 0.01 to 0.03 part of organic bismuth catalyst and 75 to 80 parts of butanone. The polyurethane prepolymer with specific crystallization performance is synthesized through cooperation of polycaprolactone polyol and polyester polyol, and the yellow glue is endowed with excellent plasticizer corrosion resistance and low-temperature activation capacity. Active groups in the polyurethane prepolymer are subjected to graft copolymerization with the chloroprene rubber adhesive and MMA, and a plasticizer-resistant polyurethane chain segment is introduced into a molecular chain of the chloroprene rubber adhesive, so that a hard segment-soft segment alternating block structure is formed, and corrosion resistance and viscoelasticity are both considered.

The application discloses basalt flake anti-scratch polyurethane paint, a preparation method and application thereof, the paint comprises a component A and a component B with a mass ratio of 4-6:1, the resin in the component A comprises modified hydroxyl acrylic resin and hydroxyl acrylic resin; wherein the modified hydroxyl acrylic resin is prepared from raw materials comprising the following components: wear-resistant component with double bonds 20-50%, acrylic monomer 10-20%, hydroxyl acrylic monomer 15-30%, second solvent 20-30% and dibenzoyl peroxide 0.5-3%. The component A of the paint adopts low-density modified hydroxyl acrylic resin containing hard wear-resistant particles, the resin is blended with traditional resins, and the low-density resin containing hard wear-resistant particles prepared in the paint will float on the surface of the coating during the surface drying process, so that a hard wear-resistant surface layer is formed, the hardness can reach more than 4H, and the paint not only has wear resistance, but also can well protect the paint from being scratched by sand or sharp objects.

The invention relates to the technical field of fireproof coatings, in particular to an environment-friendly fireproof coating for medical equipment and a preparation method of the environment-friendly fireproof coating. The modified acrylic emulsion is prepared by adding an acrylic reaction monomer, an acrylated antibacterial material, an acrylated flame-retardant material, dibenzoyl peroxide, triethylamine, flame-retardant siloxane, ethanol and deionized water. Adding hydroxyethyl cellulose, titanium dioxide, a defoaming agent and a dispersing agent into the modified acrylic emulsion, and uniformly stirring to obtain the environment-friendly fireproof coating. The environment-friendly fireproof coating prepared by the invention has excellent flame retardance, environment friendliness and antibacterial property, so that the environment-friendly fireproof coating has a wide application prospect in the technical field of fireproof coatings.

The invention discloses a method for preparing benzoyl peroxide gel and application, and belongs to the technical field of medicine preparation. The preparation method comprises the following steps: preparing a ternary eutectic solvent by taking choline chloride, glycerol and benzoic acid as raw materials, mixing benzoyl peroxide with the ternary eutectic solvent to obtain a benzoyl peroxide system, and mixing the benzoyl peroxide system with a gel system on the basis to prepare the benzoyl peroxide gel with relatively high stability, storage stability and antibacterial activity.

The invention relates to the technical field of wood-plastic composite materials, and discloses a preparation method of a molded wood-plastic composite material. According to the invention, dibenzoyl peroxide is used as an initiator, 4-glycidyl ether styrene phosphate is subjected to a polymerization reaction to obtain a flame-retardant polymer, and then the flame-retardant polymer is mixed with polystyrene, wood flour and an antioxidant to obtain the molded wood-plastic composite material with synchronously improved mechanical properties and flame retardancy. The flame-retardant polymer disclosed by the invention contains a polystyrene molecular chain and an epoxy group, and can be used as a compatilizer, so that the compatibility between polystyrene and wood flour is improved, and the mechanical properties such as tensile strength of a composite material are obviously improved. The flame-retardant polymer also contains a phosphate group, so that the combustion char-forming capability of polystyrene is improved, and the wood-plastic composite material has relatively high limit oxygen index and flame-retardant property.

This invention relates to the field of ABS material technology, and more particularly to an impact-resistant composite ABS sheet and its preparation method. The raw materials of the aforementioned impact-resistant composite ABS sheet, by weight, include: 100-200 parts of emulsion-processed ABS resin, 10-20 parts of butadiene monomer, 5-10 parts of methyl methacrylate, 1-5 parts of glycidyl acrylate, 1-5 parts of maleic anhydride, 5-15 parts of styrene, 1-5 parts of aminated silica, 0.1-0.5 parts of benzoyl peroxide, 0.1-0.3 parts of triethylamine, 0.1-1 parts of emulsifier, 0.01-0.1 parts of first initiator, 0.05-0.2 parts of second initiator, 1-3 parts of oxidized polyethylene wax, 1-2 parts of lubricant, and 1-3 parts of antioxidant. This invention solves the contradiction between the heat resistance and impact strength of ABS resin, and has significant advantages over traditional modified systems, fully meeting the application requirements of the sheet in high-temperature vibration environments.

The invention provides a rubber / EVA dual-purpose treating agent and a preparation method and application thereof.The rubber / EVA dual-purpose treating agent is prepared from an ethylene chloride-vinyl acetate copolymer, a styrene-butadiene-styrene block copolymer, methyl methacrylate, benzoyl peroxide, 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, a styrene-butadiene-styrene block copolymer, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and a styrene-butadiene-styrene block copolymer. The adhesive is prepared from 2, 6-di-tert-butyl-4-methylphenol, chloroprene rubber, butadiene styrene rubber, 2-hydroxyethyl methacrylate, an auxiliary agent, a diluent and a solvent. The rubber / EVA dual-purpose treating agent can be universally used for two materials, namely rubber and EVA, so that inferior-quality products and mixed use conditions in the production process are reduced, waste is not easily caused, and the rubber / EVA dual-purpose treating agent is convenient to use; components with strong pungent smell, such as trichloroisocyanuric acid, do not need to be added, so that the prepared treating agent is relatively small in smell and beneficial to environmental protection.

This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. The adhesive comprises a resin component and a curing component. The resin component includes maleic anhydride, phthalic anhydride, diol, catalyst, polymerization inhibitor, and crosslinking monomers, etc., and the diol includes at least 1,2-propanediol. The curing component includes an accelerator composed of dimethylaniline and zinc adipate, and a benzoyl peroxide initiator. The adhesive of this invention is colorless and transparent after curing, exhibits excellent resistance to yellowing, is easy to apply, and after curing with fillers, possesses excellent shear strength, water shear strength, and impact resistance. It can be widely used in high-end stone splicing, repair, and craft bonding.

The invention relates to the technical field of glass material preparation, and particularly discloses ultrathin flexible glass containing a flexible material coating and a preparation method thereof.According to the ultrathin flexible glass containing the flexible material coating, acrylic acid modified organic silicon resin serves as a main film-forming matrix, the coating is endowed with excellent weather resistance and chemical stability, and the coating is not prone to deformation; the introduction of the composite modified polyurethane significantly enhances the toughness, wear resistance and ultraviolet aging resistance of the coating, and the vinyl silicone oil has the effects of enhancing the flexibility and improving the leveling property and surface smoothness of the coating, and also can reduce the surface tension of the coating, so that the coating is more uniformly distributed on the glass surface; benzoyl peroxide is used as an initiator to promote crosslinking and curing of the resin under a low-temperature condition, so that the crosslinking density is improved, the transmission of external force impact is effectively blocked, and the impact resistance of the coating is improved.

This invention discloses a high-temperature resistant flat cable and its manufacturing process, comprising: a flat aluminum alloy busbar, an insulation layer covering the outer surface of the flat aluminum alloy busbar, and a flat aluminum alloy tube covering the outer surface of the insulation layer; the insulation layer is formed by extruding cable material, and the cable material is composed of the following components in parts by weight: 100 parts of polyethylene resin, 1-3 parts of silane crosslinking agent, 0.5-1 parts of glycidyl methacrylate, 0.1-1.5 parts of antioxidant, 0.05-0.2 parts of initiator, 0.2-0.5 parts of tetrabutyl zirconate, and 0.1-0.3 parts of triallyl isocyanurate; the silane crosslinking agent is vinyltrimethoxysilane or vinyltriethoxysilane, and the initiator is at least one of dicumyl peroxide, methyl ethyl ketone peroxide, or benzoyl peroxide. The insulation layer of the high-temperature resistant flat cable of this invention has a breakage elongation change rate of 10~20% after aging at 125℃, and an elongation rate of 30~55% under thermal extension load, thereby improving the high-temperature resistance and service life of the flat cable.

The invention discloses a pumpable resin anchoring agent for mounting a mine tunnel anchor rod and a pumping device of the pumpable resin anchoring agent, and relates to the field of mine anchor rod mounting devices. Comprising the following components in parts by weight: 100-120 parts of unsaturated polyester resin, 1-3 parts of an accelerant, 1-10 parts of a thixotropic agent, 300-400 parts of superfine modified filler, 2-5 parts of a silane coupling agent, 3-6 parts of a low-shrinkage additive, 1-3 parts of a wetting dispersant and 1-2 parts of a styrene inhibitor; the catalyst component is prepared from the following components in parts by weight: 10 to 15 parts of benzoyl peroxide, 10 to 15 parts of dibutyl phthalate, 5 to 10 parts of a composite initiator, 0.5 to 1.5 parts of a thickening agent, 0.1 to 0.3 part of zinc stearate and 100 to 120 parts of deionized water; during construction, a resin component and a catalyst component are mixed according to the mass ratio of 100: (10-20), and are conveyed and injected into a drill hole through a pumping device; by matching with the pumping device with the rotary groove cutting, multi-channel grouting and pressure monitoring functions, active leaking stoppage, accurate isolation and efficient anchoring of irregular drill holes of a mine tunnel are achieved, and the sealing performance, stability and construction efficiency of anchor rod installation are greatly improved.

The invention provides a super wear-resistant self-cleaning road marking coating and a preparation method thereof, and the super wear-resistant self-cleaning road marking coating is prepared from the following raw materials in parts by weight: 35-43 parts of oily acrylic resin emulsion, 8-10 parts of porous structure zeolite powder, 20-25 parts of ground calcium carbonate, 8-10 parts of titanium dioxide, 4-5 parts of modified nano titanium dioxide, 4-5 parts of modified nano zirconium dioxide and 1-3 parts of polytetrafluoroethylene micro powder. The repairing agent is prepared from the following components in parts by weight: 1-2 parts of silicon carbide whiskers, 0.3-0.5 part of a rheological additive, 0.4-0.8 part of a composite dispersant, 1.4-2 parts of dibenzoyl peroxide, 0.5-0.8 part of a wetting agent and 5-6 parts of a fluorinated repairing agent. Part of the fluorinated modifier is loaded in pores of the porous structure zeolite powder, and the rest part of the fluorinated modifier is dispersed in the coating. The technical bottlenecks of insufficient wear resistance, easy attenuation of self-cleaning performance, incapability of maintaining the self-cleaning performance under wear and the like of the existing road marking paint are overcome.

This invention discloses an A2-grade flame-retardant aluminum composite panel core material and its preparation method. The flame-retardant aluminum composite panel core material comprises the following raw materials in parts by weight: 10-12 parts of matrix resin, 85-90 parts of flame retardant, 0.5-1.5 parts of flame retardant synergist, 0.01-0.03 parts of benzoyl peroxide, 1-2 parts of anionic surfactant, 2-4 parts of compatibilizer, 1-2 parts of antioxidant, and 0.5-1.5 parts of antibacterial agent. The aluminum composite panel core material contains a flame retardant, which decomposes upon heating during combustion, releasing water vapor, absorbing a large amount of heat, reducing the surface temperature of the material, and diluting the concentration of oxygen and combustible gases. At the same time, it forms a "worm-like" fluffy char layer that effectively insulates against heat and oxygen and prevents combustibles from escaping. The addition of the flame retardant synergist promotes further densification of the formed char layer, preventing the char layer from burning through or falling off, further improving the flame-retardant effect of the aluminum composite panel core material, achieving a flame-retardant grade of A2.

The application discloses a preparation method of dibenzoyl peroxide, and relates to the technical field of organic peroxide preparation. The preparation method comprises the following steps: preparing dibenzoyl peroxide crude product and initial synthesis obtained recycling mother liquor; taking out two parts from the initial synthesis obtained recycling mother liquor, and reacting with a sodium hydroxide solution, hydrogen peroxide, a surfactant aqueous solution and benzoyl chloride; at least the benzoyl chloride is contained in the multiple materials, and the multiple materials are pre-mixed by a pre-mixer; heat preservation reaction is carried out, and after the reaction is completed, centrifugal separation is carried out to obtain the dibenzoyl peroxide crude product and second synthesis obtained recycling mother liquor; and the dibenzoyl peroxide crude product is sequentially subjected to water washing and solid-liquid separation to obtain a finished product. The pre-mixer is used to realize instant super-uniform mixing of the materials, the reaction is more uniform, the product is fine and small in particle size, the particle size distribution is uniform, the reaction yield is high, the amount of water used for subsequent washing is reduced, the recycling of the mother liquor reduces the discharge amount of high-salinity organic waste liquid from the source, and the preparation cost is reduced.

The application relates to the technical field of ABS packaging bottles, and more specifically to an ultraviolet-resistant ABS material, a preparation method thereof and a packaging bottle. An ultraviolet-resistant ABS material comprises the following raw materials in parts by weight: 50-80 parts of styrene, 14-26 parts of acrylonitrile, 12-18 parts of a benzotriazole ultraviolet-resistant absorber, 8-14 parts of butadiene, 0.1-0.9 parts of benzoyl peroxide, 0.1-0.5 parts of tertiary dodecyl mercaptan and 40-60 parts of toluene; the benzotriazole ultraviolet-resistant absorber comprises the following raw materials in mole: 1-3 parts of hydroxyethyl methacrylate, 2-4 parts of toluene-3,5-diisocyanate and 1-3 parts of a polyhydroxy-containing ultraviolet-resistant absorber. The ultraviolet-resistant ABS material has excellent ultraviolet-resistant performance and migration resistance.

This invention discloses a method for preparing 2,4-dihydroxyacetophenone using acetaldehyde as the acetyl source. Under the presence of an oxidant and a catalyst, acetaldehyde, as the acetyl source, undergoes a direct free radical acylation reaction with resorcinol to obtain 2,4-dihydroxyacetophenone. No transition metal salts are required during the reaction. This method, using acetaldehyde as the acetyl source, facilitates a highly efficient free radical acylation reaction with resorcinol under the combined action of N-hydroxyphthalimide (NHPI) and benzoyl peroxide (BPO), producing 2,4-dihydroxyacetophenone in one step without the need for any transition metal salts. This method completely solves the environmental pollution and metal residue problems associated with traditional methods. The reaction conditions are mild, no special equipment is required, and the method exhibits high selectivity, non-corrosiveness, high product purity, and low production cost, showing broad prospects for industrial application.

The present application is directed to stabilized core-shell microcapsules comprising a core of benzoyl peroxide (BPO) or all trans retinoic acid (ATRA) and a metal-oxide shell; and to pharmaceutical compositions and methods of use thereof.

The invention relates to a preparation method of coating-grade polyvinylidene fluoride, which comprises the following steps: S1, weighing azobisisoheptonitrile and benzoyl peroxide, and dissolving in deionized water to obtain a composite initiator solution; s2, adding deionized water, an emulsifier and a vinylidene fluoride monomer into a reaction kettle, heating, dropwise adding the composite initiator solution obtained in S1, and stirring for reaction; and S3, carrying out condensation demulsification on the reaction product obtained in S2, carrying out filter pressing and washing, and carrying out flash drying and crushing to obtain the coating-grade polyvinylidene fluoride. Compared with the prior art, the method can meet the strict requirements of coating-grade PVDF on molecular weight distribution (target PDI < = 1.6) and impurity content (target < = 50ppm).

The invention relates to the technical field of resin preparation, in particular to zirconium-loaded chromium removal resin as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing methyl acrylate, divinyl benzene and dibenzoyl peroxide to obtain a homogeneous organic mixture; mixing water, cellulose, sodium chloride and the methylene blue solution to obtain a mixture; mixing the homogeneous organic mixture, the mixed material and a pore-foaming agent, then carrying out heat treatment, recovering the pore-foaming agent to obtain a polyacrylic acid-divinylbenzene copolymer, and the like, so as to obtain the zirconium-loaded chromium-removing resin. The zirconium stability of the zirconium-loaded chromium removal resin is very good, and the resin-loaded zirconium shedding rate is less than 50% after the resin is soaked in 1 + 1 hydrochloric acid for 48 h; the zirconium-loaded chromium removal resin can effectively remove chromium metal in the cobalt chloride solution, the chromium metal is less than 0.01 mg / L, and the requirements of customers are met.