72 results about "Di-tert-butylhydroquinone" patented technology

The invention provides a resin composition for an insulation film, and the insulation film and a circuit board containing the same. The resin composition comprises: (A) 100 parts by weight of epoxy resins; (B) 20 to 100 parts by weight of a polybutadiene styrene divinylbenzene graft terpolymer resin; (C) 2 to 20 parts by weight of di-tert-butylhydroquinone; (D) 5 to 50 parts by weight of a polyphenylene ether modified cyanate ester resin; and optionally containing at least one of the following components: (E) an inorganic filler, (F) a refined extending sealing agent and (G) a catalyst. By containing the specific components and proportions, the resin composition can achieve high heat resistance, low dielectric constant and low dissipation factor, and is halogen-free, and thus the resin composition can be applied in a protection film of a printed circuit board, an insulating protection film of an electronic building brick or a resin insulation film of a lead frame.

The invention discloses a preparation method of a high-performance fluoride rubber / silicone rubber cable sheath material. The preparation method comprises the following steps of performing primary mixing on fluoride rubber, silicone rubber, epoxy acrylate elastomer, hydrogenated butadiene-acrylonitrile rubber, maleic anhydride grafted polyethylene and methyl vinyl silicone rubber grafted methacrylic acid-2,2,2-trifluoroethyl to obtain a primary rubber compound; adding carbon nanotubes, stearic acid modified diatomite, calcium silicate, polyaniline nanofibers, sepiolite fibers and calcium hydroxide, and mixing for 1 to 5 minutes; adding 2,6-di-tert-butyl paraaminophenol, 2,5-di-tert-butylhydroquinone, nitrosodiphenylamine, butylmercaptooxo stannane, 5,5'- dimethyl-5,10-dihydracridine, and mixing for 3 to 8 minutes; adding stearic acid, inositol hexaphosphate, epoxidized linseed oil, active magnesium oxide, bisphenol AF, benzyl triphenyl phosphorus chloride, N,N'-meta phenylene bismaleimide, phenolic resin and an accelerator, mixing for 5 to 10 minutes and then vulcanizing for two times.

The invention discloses a purification method for tertiary butyl hydroquinonel, relates to the tertiary butyl hydroquinone, and provides the purification method for the tertiary butyl hydroquinonel, which has the advantages of high efficiency, simple method and capability of meeting national food safety standard. The purification method comprises the following steps of: (1) uniformly mixing hydroquinone, tertiary butyl hydroquinonel and 2,5-ditertbutylhydroquinone, adding water, stirring and then filtering mixture; (2) adding filter cakes obtained by the step (1) into formic acid, recrystallizing, separating out the 2,5-ditertbutylhydroquinone and filtering off the 2,5-ditertbutylhydroquinone; and (3) desolventizing filtrate obtained by the step (2), removing the formic acid to obtain the tertiary butyl hydroquinonel and recycling the formic acid. The content of the obtained tertiary butyl hydroquinonel can reach up to 99 percent.

The invention discloses a rubber lining rubber material for a corrosion resisting butterfly valve lined with rubber. The rubber lining rubber material is formed by mixing a rubber material A and a rubber material B, wherein the rubber material A comprises the following raw materials in part by weight: 85 to 95 parts of nitrile rubber 3305, 0.3 to 0.5 part of sulphur, 4 to 6 parts of magnesium oxide, 3 to 4 parts of stearic acid, 1 to 2 parts of antioxygen 2,5-di-tert-butylhydroquinone (DTBHQ), 1 to 2 parts of antiager RD, 1 to 2 parts of antiager 4010NA, 3 to 4 parts of paraffin, 22 to 25 parts of fast extrusion carbon black, 62 to 65 parts of high wear resistant carbon black 330, 18 to 22 parts of dioctyl ester, 25 to 35 parts of calcium carbonate, 3 to 4 parts of accelerator, 1 to 2 parts of accelerator tetramethylthiuram disulphide (TMTD), and 1 to 2 parts of accelerator tetraethyl-thinram disulfide (TETD); and the rubber material B comprises the following raw materials in part by weight: 82 to 87 parts of homopolymerization epichloro-hydrin rubber, 12 to 18 parts of copolymerization epichloro-hydrin rubber, 1 to 2 parts of zinc stearate, 1 to 3 parts of antiager RD, 0.4 to 0.6part of rubber change element, 1 to 2 parts of rhine wax, 45 to 55 parts of fast extrusion carbon black, 10 to 14 parts of kieselguhr, 5 to 8 parts of dioctyl ester,4 to 6 parts of lead dioxide, 0.8 part of vulcanizer trithiocyanuric acid (TCY), and 1 to 2 parts of accelerator Na-22. The rubber lining rubber material has good comprehensive performance, and the butterfly valve which is obtained through vulcanization has the characteristics of high air tightness, weather fastness, chilling resistance, and oil resistance and the like; meanwhile, the material cost is low.

The invention discloses an improved aging-resistant waterproof coating material. The improved aging-resistant waterproof coating material is prepared from the following raw materials in parts by weight: 5-10 parts of fluoro-olefin resin, 2.5-3.8 parts of 4-methyl guaiacol, 3.5-8 parts of glycol, 2.5-7 parts of white latex, 1.2-3.5 parts of propylene glycol methylether acetate, 1.2-2.8 parts of trimethylol propane triacrylate, 1.5-3.6 parts of 5-di-tert-butyl-hydroquinone and 2.3-3.8 parts of aluminum-carbon firebrick powder. According to the waterproof coating material disclosed by the invention, the aluminum-carbon firebrick powder is added, and density differences exist between the aluminum-carbon firebrick powder and other ingredients, so that when the waterproof coating material disclosed by the invention is coated on a waterproof surface, the aluminum-carbon firebrick powder in the waterproof coating material can be of layered distribution due to different densities and can exert a waterproof effect like that of two-felt three-oil; a finished product of the waterproof coating material has the advantages of convenience in construction, strong bonding power and tensile resistance and good ageing resistance.

A resin composition includes (A) 100 parts by weight of epoxy resin; (B) 20 to 100 parts by weight of polybutadiene styrene divinylbenzene graft terpolymer resin; (C) 2 to 20 parts by weight of di-tert-butylhydroquinone (DTBHQ); (D) 5 to 50 parts by weight of polyphenyl ether modified cyanate ester resin; and at least one of (E) inorganic filler, (F) chain extending sealing agent, and (G) catalyst. The resin composition is characterized by specific ingredients and proportions thereof to attain high heat resistance, low dielectric constant Dk, and low dielectric dissipation factor Df, and being halogen-free, and therefore is applicable to protective film of printed circuit boards, insulating protective film of electronic components, and resin insulation film of leadframes.

The invention relates to the technical field of antioxidant preparation methods, and particularly relates to a preparation process of tert-butylhydroquinone (TBHQ). The preparation process comprises the following steps of (1) simultaneously adding excessive dilute sulphuric acid, equimolar hydroquinone and tertiary butyl acetate to a reaction still, wherein the weight ratio of the dilute sulphuric acid to the tertiary butyl acetate is 1:(3 to 6); (2) stirring and heating to 85 to 95 DEG C, and reacting for 1 to 8 hours; (3) stopping stirring, cooling to 65 to 75 DEG C, and then performing centrifugal filtration, wherein filtrate of sulphuric acid is recycled, and obtained filter residues are washed with 1 to 3 times warm water, so as to obtain a crude product of the TBHQ. Compared with the prior art, the preparation process has the advantages that the hydroquinone and the tertiary butyl acetate are used as raw materials, and the dilute sulphuric acid is used as a catalyst and a reaction solvent, so as to promote a reaction; tertiary butyl is supplied by the tertiary butyl acetate, so that side reactions are reduced; the crude product contains 70% to 75% of TBHQ, the content of DTBHQ (Di-Tert-Butylhydroquinone) as a by-product is low, the yield can reach 65 to 70% after purification, the yield is greatly increased, and great economic benefits are obtained.

The invention relates to 2,5-di-tert-butyl-terminated poly(ether-ether-ketone) (PEEK), and a preparation method thereof. The end-capped poly(ether-ether-ketone) provided by the invention has advantages of easily controllable molecular weight, high heat resistance, good chemical stability, radiation resistance, good toughness, and the like.

The invention relates to a heat-insulation coating which is prepared by blending the following raw materials in percent by weight: 20-25% of base epoxy resin, 15-20% of polyethylene plastic hollow powder as main body, 25-30% of water, 15-20% of adhesive A agent and 5-20% of additive B agent, wherein the A agent is composed of the following components in percentage by weight: 15% of methyl methacrylate, 35% of ethyl acrylate, 40% of butyl acrylate and 10% of activator; and the B agent is composed of the following components in percentage by weight: 20% of di-tertiary-butyl hydroquinone antioxidant, 25% of acid-resistant additive, 25% of alkaliproof additive, 10% of toughness additive and 20% of defoaming agent. After the coating is coated on the external walls of general cement houses, the room temperature can be decreased by 6-8 DEG C; flowing phenomenon does not exist when the temperature is more than 55-70 DEG C, and cracking and falling phenomena do not appear even if the temperature is lower than minus 40-minus 50 DEG C.

The invention provides a biomass fuel and a preparation method thereof. The biomass fuel includes the following ingredients in parts by weight: lignin, agricultural waste, sea mud, sepiolite wool, alumina, silane coupling agent, chlorinated Ammonium, simethicone, yeast powder, capsaicin, di-tert-butyl hydroquinone, oxygen enhancer, anti-shock and explosion-proof agent, combustion enhancer, loosening agent. The biomass fuel has low moisture content and high lignin content, and utilizes a large amount of agricultural waste, which not only greatly reduces the air pollution caused by activities such as burning agricultural waste, but also improves the use value of recycling and is more environmentally friendly. Compared with conventional biomass fuel particles, it has high combustion value, long combustion time, no harmful gas emission after combustion, and will not corrode combustion equipment.