279 results about "Bisphenol AF" patented technology

The invention discloses a synthesis method for bisphenol F, in which aluminium chloride, titanium tetrachloride and modified cation exchange resin are adopted as catalysts, and phenyl hydroxide and formaldehyde are adopted as raw materials. The invention has the technical effects as follows: the aluminium chloride, the titanium tetrachloride and the modified cation exchange resin are adopted for catalysis to synthesize the bisphenol F, and the resin catalyst is easy to separate and recover and can be used repeatedly; 2, a recrystallization and reduced pressure distillation combined separation technology is adopted for coproduction of high-purity bisphenol F and common bisphenol F products, the maximum yield of the bisphenol F reaches 90 percent, the content of 4, 4'-bisphenol F in a dimethyl benzene recrystallization product reaches 93.5 percent, reduced pressure distillation after-products are mainly other two isomers, and the separation of the 4, 4'-bisphenol F is realized effectively; 3, the requirement for the concentration of the formaldehyde raw material is not strict while the traditional one stage process require that the concentration of formaldehyde is above 40 percent; and 4, the synthesis technology is simple, the operation is convenient, and the realization of industrial production is easy.

The invention relates to a method for detecting bisphenol A and bisphenol AF in food, belonging to technical field of analytical chemistry determination method. With ionic liquid (1-butyl-3-methylimidazole hexafluorophosphate) as an extractant and TritonX-100 or acetone as an dispersant, ultrasonic oscillation is carried out to form emulsion; after centrifugal separation, extraction drops at the lower layer are directly subjected to HPLC (high performance liquid chromatography) quantitative analysis. The method disclosed by the invention has the advantages of simpleness in detection steps, easiness in operation, low detection limit and high enrichment multiple, greatly reduced detection cost. The method disclosed by the invention is a rapid, efficient and environmentally friendly pre-treatment technology and has a wider application prospect in the field of food analysis.

The invention provides a fluororubber rubber compound and a preparation method thereof. The fluororubber rubber compound is prepared by mixing binary intermediate-low monney sectional fluororubber rubber, reinforcing system (MT N990 carbon black and inorganic filler), acid absorbing system (active magnesium oxide and superfine calcium hydroxide), vulcanizing system (benzyl triphenyl phosphorus chloride and bisphenol AF), releasing agent (alfux and/or carnauba wax), and multifunctional bisphenol vulcanizing composite assistant vulcanizing agent L; the obtained fluororubber rubber compound has high stretching strength, and high extending rate, increases the scorching time by improving the liquidity of the rubber, therefore, high adaptability of the rubber to different manufacture technical environments and the vulcanizing environments can be ensured, the safety in vulcanizing can be improved, and as a result, the rejection rate of the products can be reduced. The fluororubber rubber compound provided by the invention is applicable to industries such as aerospace, aviation, car, metallurgy, petrochemical industry and electron and the like.

The invention provides a rubber composite used for rubber framework oil seal and a preparation method thereof. The rubber composite contains(based on weight portions) 100 portions of fluorubber26, 5-6 portions of acid absorber magnesia, 5-6 portions of calcium hydroxide, 9-1 portions of strengthening agent black carbon, 19-20 portions of barium sulphate, 17-19 portions of iron oxide red, 2-3 portions of process additive, 1.5-2 portions of curing ingredient bisphenol AF, and 0.6-0.8 portions of accelerant BPP. The rubber composite improves the tension strength, extensibility, tear resistance, self-lubricating effect, compressive deformation resistance and thermal aging resistance of the rubber framework, makes the rubber framework good in medium resistance and prolongs the service life of the rubber framework oil seal. Meanwhile, the method is simple in process, reasonable in mixture ratio and reduces preparation cost and defective index.

The invention discloses a preparation method of bisphenol F with high ortho-position isomer content. The preparation method comprises the following steps: synthesizing the bisphenol F by adopting a two-step method, separating an organic phase and a phosphoric acid phase, neutralizing the organic phase and removing salt, and recovering phenol under the reduced pressure to obtain the bisphenol F product, wherein in the first step of the two-step synthesis method, the phenol reacts with formaldehyde under the weakly acidic condition; and in the second step, a large amount of catalyst phosphoric acid and formaldehyde are added into the reaction liquid obtained in the first step, and the formaldehyde completely reacts. The invention overcomes the defects that the content of the ortho-position isomer in the bisphenol F prepared by the existing bisphenol F preparation method is low, the curing speed of the synthesized bisphenol F epoxy resin is slow, the resin is easy to crystallize and the like.

The invention relates to a method for preparing bisphenol F by using a 1-alkyl-3-methylimidazole acidic ionic liquid. According to the invention, phenol and formaldehyde are used as raw materials, and the 1-alkyl-3-methylimidazole acidic ionic liquid is used as a solvent and a catalyst, and bisphenol F can be prepared by condensation reaction. As for the method, other organic solvents easy to volatilize are not used, the defects that the reaction time is long, recovery is difficult, the service life is short, the corrosivity is strong and the like when the bisphenol F is subjected to catalytic synthesis by common bronsted acid can be solved, and the method provided by the invention is a novel bisphenol F preparing method which is efficient and environment-friendly.

The invention relates to a seal ring rubber material and a mixing method thereof. The mixing method comprises the following steps: carrying out crude rubber laminating and roller covering: adding 1-1.5 parts of aflux-42 serving as a processing agent and 1.5-2 parts of TM-80 serving as a mould release agent into 100 parts of fluororubber serving as crude rubber; mixing the above components of the rubber material for about 1 minute at the roller temperature of 40-45 DEG C, and adding 4-6 parts of activated magnesia serving as an acceptor; evenly mixing, adding 30-40 parts of a reinforcing agent which contains aramid pulp fiber; evenly mixing once again, adding 1-1.5 parts of bisphenol AF serving as a vulcanizing agent and 1-0.5 part of tert-butyl peroxypivalate (BPP) serving as an accelerator; and finally adding 5-7 parts of calcium hydroxide, packaging into a cornucopla for three or four times after all compounding ingredients are consumed up under the roller temperature of below 55 DEG C, adjusting the roller distance to be less than 0.55mm, rolling the dropped rubber for five or six times, and discharging. The seal ring rubber material has the advantages of rapid vulcanization speed of fluororubber, high production efficiency and low rejection rate.

The invention relates to a synthesis method of bisphenol F in a salt bath system. The bisphenol F, which is relatively high in yield, high in content of 4,4-dihydroxy diphenyl methane and good in selectivity, is prepared from a reaction of phenol and formaldehyde under a salt bath system and a catalyst through regulating and controlling technological parameters. And the preparation method is simple, and the synthesis process is free from an organic solvent, thus being light in environmental pollution.

The instant invention relates to compositions comprising a benzoxazine resin and an advancement resin based on bisphenol A diglycidyl ether and bisphenol S and, optionally, ferrocene and aluminium trihydrate. Such compositions are, when cured to form polymeric networks, difficultly inflammable and resistant to high temperatures. Such compositions may especially be used in the production of printed wiring boards.

The invention discloses a modified fluororubber compounded stock. The modified fluororubber compounded stock comprises the following components in parts by weight: 100 parts of raw rubber of fluororubber, 10-30 parts of thermal cracking carbon black, 10-30 parts of furnace black with high wear resistance, 2-8 parts of wear-resistant additives, 0.2-0.6 part of processing additives, 2-4 parts of active magnesium oxide, 5-9 parts of calcium hydroxide, 1.5-3.0 parts of bisphenol A and 0.4-0.8 part of benzyl triphenylphosphonium chloride. The invention further discloses a preparation method of the compounded stock, the hardness of the obtained high-strength, high-elasticity and oil-resistant fluororubber compounded stock after vulcanization can be controlled within 70-85, and the modified fluororubber compounded stock has the advantages of good processability, low cost, simple method and easiness in industrialization.

The invention relates to a preparation method of bisphenol F, which is characterized in that under the condition of existence of an acid catalyst, phenol and formaldehyde are reacted to obtain the product. The acid catalyst is a mixture of inorganic acid and organic acid, and the mol ratio of the inorganic acid to organic acid is 10-2:1; the inorganic acid is oxygen-containing acid of phosphor, the organic acid is C1-C4 straight chain or branched chain monoacid or diacid. The invention has the advantages that under the condition that P/F is less than or equal to 10, the bisphenol F with high ortho-isomer (especially 2,4'-isomer ) content can be obtained, the production capability of the device can be increased, and the operation cost and the energy consumption are reduced.

The invention belongs to the field of organic compound processing, and provides a mixture for automobile high-speed rotation oil seals, which is prepared from the following components in parts by weight: 100 parts of fluororubber, 1.5-2.5 parts of bisphenol AF, 0.4-0.8 part of accelerator BPP, 2-5 parts of active magnesium oxide, 4-10 parts of calcium hydroxide, 0-50 parts of carbon black, 5-50 parts of calcium silicate, 0-50 parts of hexagonal boron nitride, 0-20 parts of carbon nanotube and 1-3 parts of mold release agent. By adopting the fluororubber F246 (the Mooney viscosity is 100-150) as the base unvulcanized rubber and optimizing the formula system, the physical and mechanical properties of the vulcanized fluororubber of the original formula are basically unchanged. The two different types of heat-conducting fillers are compounded to enhance the heat conductivity coefficient of the compounded rubber under the synergic actions, and the heat-conducting property of the vulcanized rubber product for manufacturing is obviously enhanced.

The invention discloses a method for preparing a composite curing agent modified bisphenol F thermosetting adhesive repairing agent special for ballastless track gap and crack damage. The method comprises three steps of: preparing a bisphenol F epoxy resin main agent, compositing a polythiol-aminal type composite modified curing agent and curing the bisphenol F epoxy resin by the polythiol-aminaltype composite modified curing agent. The repairing agent prepared by the method has the characteristics of low viscosity, low curing temperature, rapid curing, stable volume stability and wide application prospect.

The invention relates to a polyphosphazene microsphere as well as a preparation method and an application thereof in the technical field of materials. The polyphosphazene microsphere has the structural formula as disclosed in the specification. The preparation method of the polyphosphazene microsphere comprises the following steps of: (1) in the presence of an acid binding agent and an organic solvent, carrying out polycondensation reaction on hexachlorocyclotriphosphazene and bisphenol AF to obtain a solution; (2) and filtering the solution, washing a filtering medium, and drying to obtain the polyphosphazene microsphere. The invention also relates to application of the polyphosphazene microsphere in the preparation of a super-hydrophobic surface. The polyphosphazene microsphere has the advantages of low cost, excellent thermostability, flame retardance, chemical durability and radiation resistance. The preparation method has the advantages of short time, mild reaction conditions and simple process. The super-hydrophobic surface prepared from the polyphosphazene microsphere has excellent super-hydrophobicity.

The invention provides a tear-resistant fluoro-rubber mixed compound and a preparation method thereof, which belong to the filed of mixed compound application. The tear-resistant fluoro-rubber mixed compound is formed by mixing a binary fluoro-rubber, a ternary fluoro-rubber, active magnesium oxide, calcium hydroxide, a vulcanization system (bisphenol vulcanization system: bisphenol AF, benzyl triphenyl phosphorus chloride or peroxide vulcanization system: DBPH, TAIC), a carbon nanotube, a releasing agent, a reinforcing agent, and the like. The mixed compound prepared according to the invention is good in tear resistance, and can be widely used in rubber products.

The invention discloses a method for preparing bisphenol F. The method is characterized in that phenol and formaldehyde serving as raw materials and a solid acid catalyst serving as a catalyst are used to prepare the target product bisphenol F, wherein the solid acid catalyst is prepared from heteropoly acid modified clay, and the mass dosing ratio of the catalyst to formaldehyde is (0.01-0.6):1; and the heteropoly acid is one or more of phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, silicomolybdic acid and the like, wherein the clay is one or more of bentonite, kaoline, montmorillonoid, metakaolin, diatomaceous earth and the like. The method has the prominent advantages that the yield of the product bisphenol F is up to 93 percent, the selection to bisphenol F is 96 percent, the catalyst is friendly to environment, the preparation process is simple, the production cycle is short, the catalyst activity and catalytic selection are high, separation and reclamation are easy, recycling is available, and industrialization is facilitated.

The invention discloses a high-toughness low-temperature-resistant modified rubber sealing member, prepared from the following raw materials in parts by weight: 35-45 parts of chlorosulfonated polyethylene rubber, 15-25 parts of a modified copolymer, 2-6 parts of butadiene-acrylonitrile rubber, 4-8 parts of fluororubber, 2-5 parts of vinylidene fluoride hexafluoropropylene rubber, 3-6 parts of polyvinyl chloride, 2-5 parts of carbon black N550, 3-6 parts of dibutyl phthalate, 2-5 parts of dibutyl sebacate, 3-4 parts of an anti-aging agent RD, 4-8 parts of modified glass fibers, 4-8 parts of magnesium oxide, 8-9 parts of zinc oxide, 3-6 parts of a silane coupling agent KH-570, 3-6 parts of bisphenol AF, 2-5 parts of stearic acid, and 4-6 parts of a vulcanization accelerator DCP. The invention also provides a preparation method of the high-toughness low-temperature-resistant modified rubber sealing member. The rubber sealing member prepared by the method provided by the invention has excellent toughness and low temperature resistance.

The invention discloses a method for realizing catalytic synthesis of bisphenol F by virtue of a flaky Al-SBA-15 mesoporous molecular sieve catalyst. The method comprises the following steps: on the basis of taking polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (Pluronic 123) as a template, tetraethoxysilane (TEOS) as a silicon source and aluminum isopropoxide as an aluminum source, adding zirconium oxychloride under very low hydrochloric acid concentration, and adopting a hydrothermal process for preparing the flaky Al-SBA-15 mesoporous molecular sieve catalyst; on the basis of taking phenol and formaldehyde as raw materials and a flaky Al-SBA-15 mesoporous molecular sieve as a catalyst, performing condensation reaction to prepare bisphenol F, wherein the yield of bisphenol F is 98.8%. According to the method, the catalyst is high in activity, other solvents are not used in catalyst preparation and bisphenol synthesis processes, environmental friendliness is achieved, and the catalyst is low in preparation cost, easy to separate and recover and reusable.

The invention discloses a cyanate ester adhesive with low dielectrics and high toughness, and a preparation method thereof, and belongs to the field of high polymer materials. Bisphenol AF type epoxy resin (DGEBHF) and organic metal salt catalyst are used for jointly modifying cyanate ester so as to solve the problem of poor dielectrics, poor toughness and insufficient adhesion of the cyanate ester. The cyanate ester adhesive is used for the bonding of electronic products. The preparation method comprises the following steps: (1) at a ratio of 70-95%, weighing cyanate ester resin, smelting at the temperature of 100-120DEG C, cooling to 75-90DEG C, and adding 4.9-29.957% of DGEBHF to be stirred to be transparent to obtain premixing adhesive; (2) adding 0.025-0.1% of organic metal salt catalyst into the premixing adhesive obtained in (1) to be evenly mixed at the temperature of 75-90DEG C to obtain the cyanate ester adhesive with low dielectrics and high toughness. The cyanate ester adhesive has the advantages of excellent dielectricity, toughness, adhesion and solidification, simple preparation technology, low equipment requirement and environment protection.

The invention discloses a method for the catalyzed synthesis of bisphenol F by using modified hydroxyapatite. The method is implemented by taking phenol and formaldehyde as raw materials and taking modified hydroxyapatite as a catalyst through a step of carrying out a condensation reaction on the raw materials and the catalyst so as to obtain bisphenol F. The adopted catalyst is prepared by carrying out load modification by taking hydroxyapatite subjected to preliminary pretreatment as a carrier and taking any one or more of aluminium chloride, zinc chloride, copper chloride, titanium tetrachloride or ferric chloride as modifiers. The adopted catalyst is cheap and easy to obtain, the catalyst is good in dispersibility, high in catalytic efficiency, easy to separate and reusable in the reaction, and overcomes the defects of too high by-products, strong corrosivity, and the like in the process of synthesizing bisphenol F by using other catalysts; and in the process of reaction, other organic solvents are not required to be added, therefore, the method conforms to the principle of green economy.

The invention relates to grinding roller sealing ring materials. The grinding roller sealing ring materials are characterized by comprising, by weight, 100 parts of fluororubber, 10-20 parts of organic montmorillonite, 10-30 parts of wear-resisting carbon black, 5-20 parts of modified silicon carbide, 10-20 parts of graphene composites, 15-25 parts of magnesium oxide, 0.5-2 parts of hydroxyl silicone oil, 0.1-3 parts of microcrystalline wax, 0.5-2 parts of bisphenol AF and 0.5-1.5 parts of benzyl triphenyl phosphoric chloride. The graphene composites are graphene/ hydrogenated styrene- butadiene- styrene compounds subjected to in-situ reduction. The graphene/ hydrogenated styrene- butadiene- styrene compounds subjected to in-situ reduction are added, the graphene composites are dispersed easily, the problems of difficult stripping of graphene and difficult addition caused by low apparent density in the prior art are resolved, graphene can be evenly dispersed in the grinding roller sealing ring materials, the function of the graphene is fully played, and the wear resistance and heat resistance of the grinding roller sealing ring materials are effectively improved.