294 results about "Diethyl fumarate" patented technology

The invention relates to a new process for synthesizing an antiseptic, namely dimethyl fumarate, wherein, two stages of esterification between a fumaric acid and methanol under the action of a catalyst are performed to generate the dimethyl fumarate; the catalyst is a cerous methylsulfonic acid. With application of the new process and the catalyst, the shortcomings of the prior art are overcome and production cost can be reduced effectively; and the new process has simple post-processing, less environmental pollution and good development and application prospect.

The invention discloses a lead-free termite-proof polyvinyl chloride (PVC) cable material and a preparation method thereof. The lead-free termite-proof PVC cable material is prepared from the following raw materials in parts by weight: 80 to 100 parts of SG-4 type PVC resin, 15 to 25 parts of polyvinylidene chloride, 10 to 15 parts of ethylene-propylene-diene monomer rubber, 14 to 18 parts of calcium silicate crystal whisker, 2 to 3 parts of magnesium oxide, 0.5 to 1.5 parts of palm wax, 5 to 10 parts of high impact polystyrene, 15 to 20 parts of fumed silica, 5 to 10 parts of precipitated barium sulphate, 10 to 15 parts of dimethyl fumarate, 1 to 2 parts of calaium strarate, 1 to 2 parts of imarcaptoacetate dioctyltin, 8 to 12 parts of talcum powder, 10 to 15 parts of aluminium hydroxide, 3 to 5 parts of epoxy octyl stearate, 0.5 to 1 part of antioxidant 168, 2 to 3 parts of termite-proof agent S-07 and 8 to 12 parts of composite filler. The cable material provided by the invention has excellent termite-proof performance, can effectively prevent communication faults and economic losses caused by termite corroding and is environment-friendly and lead-free; and the product has reliable physical and mechanical properties, excellent flame-retardant property and excellent low-smoke and low-toxicity characteristics.

The invention provides addition type flame retardant liquid silicon resin. The addition type lame retardant liquid silicon resin comprises the following components in parts by weight: 100-130 parts of basic resin branched-chain phenylvinylsiloxane, 50-80 parts of active diluting agent linear phenylvinylsiloxane, 0.5-1.0 part of cross-linking agent linear phenyl modified hydrogen-containing siloxane, 0.01-0.05 part of chloroplatinic acid-divinyltetramethyldisiloxane catalyst and 0.001-0.01 part of temperature-sensitive inhibitor dimethyl fumarate. In the processes of preparing the basic silicon resin, an active diluting agent and a cross-linking agent, phenyl is used for pre-modifying so that the flame retardant property, the high-temperature resistance and the volume resistance of the product are greatly improved.

The invention relates to a novel two-component joint beautifying agent composed of components A and B. The component A comprises, by mass, 70-80 parts of polyaspartic acid ester, 5-15 parts of propylene carbonate, 5-10 parts of fumed silica and 2-5 parts of titanium dioxide, and the component B comprises, by mass, 70-85 parts of polyol and aromatic / aliphatic isocyanate polymer, 8-15 parts of 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate and 1-15 parts of diethyl fumarate. The novel two-component joint beautifying agent is composed of polyaspartic acid ester resin and a high-elasticity prepolymer curing agent formed by polymerizing polyol and aromatic / aliphatic isocyanate and has the advantages of being high in yellowing resistance, elastic and solvent-free, the problem that an epoxy resin type joint beautifying agent is not resistant to yellowing and water, is subject to influence of air temperature during construction and cannot be used outdoors is solved, and a gap in domestic joint beautifying industry is filled in.

The invention relates to a coumarin functional dye containing a thiophene bridge chain in the field of fine chemical industry and organic photoelectric material applications. The structure of the coumarin functional dye takes coumarin and a derivative thereof as an electron donor, contains a thiophene structure unit capable of adjusting an absorption spectrum and a fluorescence emission spectrum as the bridge chain and is further connected with a cyanoacetic acid electron withdrawing group. Coumarin-thiophene, POCl3 / DMF (dimethyl fumarate) are added into a reaction container by adopting general reaction for reaction so as to get a 5-(7-substiutted-2-carbonyl-2H-benzopyran-3-yl) thiophene-2-formaldehyde intermediate (II) with an aldehyde group; and the intermediate II with the aldehyde group further reacts with cyanoacetic acid to get the coumarin dye connected by the thiophene. As the coumarin is taken as a chromophore, the electron donating capability is good; the thiophene has high electron cloud density and special optical properties and electron transmission capability; and the electron withdrawing group of the cyanoacetic acid is further connected for enabling the dye to have good light, thermal and chemical stability and photoelectric properties. Therefore, the dye can be used as a photosensitive dye for dye-sensitized solar cells.

The invention discloses an anti-crack high slump loss resistance concrete polycarboxylate superplasticizer, being prepared from the following components in parts by weight: 25-35 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 40-50 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 3.5-4.5 parts of 2-propylene acyl amino-2-methyl-1-propane sulfonic acid, 4-5 parts of allyl polyoxyethylene ether, 3-5 parts of maleic anhydride, 2.5-3.5 parts of dimethyl fumarate, 3-5 parts of hydroxyalkyl acrylate, 4-8 parts of sodium hypophosphite, 0.5-1.5 parts of tartaric acid, 80-83 parts of water and 15-21 parts of sodium hydroxide. The anti-crack high slump loss resistance concrete polycarboxylate superplasticizer has good adaptability to cement, is less in amount of admixture and high in water-reducing rate, is capable of reducing water cement ratio and improving fluidity, is low in slump loss and remarkable in early strengthening effect, and is capable of improving the compactness of concrete, saving cement, improving the working performances of the concrete and improving the durability of the concrete.

The invention discloses a mould-prevention polyethylene water supply tubular product and a preparation method thereof. The mould-prevention polyethylene water supply tubular product is prepared from the following raw materials in parts by weight: 50-70 parts of medium density polyethylene, 25-45 parts of metallocene linear low density polyethylene, 20-30 parts of nylon 12, 15-20 parts of dimethyl fumarate, 4-8 parts of perfluorinated polyether lubricating grease, 3-6 parts of liquid paraffin, 1-2 parts of protocatechuic acid ethyl ester, 2-3 parts of propylparaben, 1.5-2.5 parts of trichlamide, 2.5-4.5 parts of antimony sulfate, 5-10 parts of jade powder, 15-20 parts of calcining loess, 2-3 parts of dodecanoic acid monoester with triglycerol, 1-2 parts of zinc undecylenate, 5-10 parts of epoxidized soybean oil, 1-2 parts of calcium stearate, 1-2 parts of barium stearate, 20-25 parts of filling master batch, 10-15 parts of dicyclohexyl phthalate, 2-3 parts of N,N'-Bis(1-methylpropyl)-1,4-phenylenediamine and 1.5-2.5 parts of chlorotributyltin. The mould-prevention polyethylene water supply tubular product has excellent antibacterial property, can effectively restrain and prevent attachment and breeding of mould, prevents mould from corroding the tubular product, has excellent mechanical property, ageing resistance, heat resistance and processability, and is long in service life and wide in application prospect.

The invention provides a tea pulp powder detergent and a preparation method thereof. A composition of tea pulp powder and three anionic surfactants (sodium lauryl alcohol sulfate, sodium tripolyphosphate and sodium dodecyl benzene sulfonate) is used as a raw material, wood meal and kaolin are added as frictional materials, and a mixture of sodium diacetate and dimethyl fumarate is used as a mold preventive. The preparation method comprises the following steps: mechanically stirring and mixing, and carrying out microwave sterilization to obtain the tea pulp powder detergent. The tea pulp powder detergent has very high oil sludge cleaning actions, lowers the chemical surfactant consumption, and reduces the environmental pollution.