8 results about "Benzoic anhydride" patented technology

This invention discloses a low-VOCs, low-odor environmentally friendly material for the production of sealing strips for passenger vehicles and its preparation method, belonging to the field of polymer materials technology. The technical solution includes the following raw materials in parts by weight: 100 parts PVC resin; 5 parts stabilizer; 40-60 parts plasticizer; 0.4-0.6 parts lubricant; 1.3-1.5 parts antioxidant; 0.3-0.4 parts ultraviolet absorber; 0.3-0.5 parts deodorizer A; 0.8-1.0 parts deodorizer B; 10-25 parts light active calcium carbonate; 1.0-1.2 parts pigment; deodorizer A is a complex of zinc amino acid, and deodorizer B is benzoic anhydride-intercalated modified aluminum-magnesium hydrotalcite. This invention can capture free, irritating small-molecule alcohols and convert them into esters with milder odors, effectively preventing alcohols from being converted into irritating ethers and ketones during processing, thus reducing the odor and VOCs of passenger vehicle sealing strips.

The application relates to the technical field of building materials, and discloses an anti-permeation concrete additive, raw materials of which comprise the following components in parts by weight: limestone powder 40-50 parts, sodium silicate 30-40 parts, hexadecyl trimethoxysilane 20-30 parts, silicon dioxide 10-20 parts, and water blocking agent 5-10 parts, wherein the water blocking agent is formed by mixing benzoic anhydride and barium oxide. The anti-permeation concrete additive solves the problem that the anti-permeation concrete additive in the prior art cannot obviously improve the anti-permeation capacity of concrete.

The application discloses sulfonate surfactant for improving pesticide adhesion and application thereof, and belongs to the technical field of surfactants. Modified sodium lignosulfonate is obtained by esterification of sodium lignosulfonate with benzoic anhydride. The esterification reaction reduces the hydrophilicity of the sodium lignosulfonate and improves the hydrophobicity. Then, the surface of the sodium lignosulfonate is coated with titanium dioxide through hydrophobic self-assembly and hydrothermal treatment, so that a porous and rough structure is obtained. The rough structure can improve the anchoring capacity on the leaf surface, and the porous structure can disperse the shear force of rainwater washing and avoid the rainwater washing from falling off the leaf surface. The sulfonic acid group can increase photo-generated carriers, improve the separation efficiency of photo-generated electrons and holes, improve the absorption rate of titanium dioxide to ultraviolet light, and effectively adsorb and combine water molecules due to the strong polarity of the sulfonic acid group, so that in-situ hydrolysis of tetrabutyl titanate on the surface of the porous sodium lignosulfonate nanosphere is promoted, and a titanium dioxide coating layer is formed through condensation.

A method for manufacturing a low-viscosity hardener is provided. The method includes the followings steps: providing a hardener crude product; and subjecting the hardener crude product and an alkaline catalyst to an isomerization reaction, so as to obtain the low-viscosity hardener. The hardener crude product contains 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride, and a weight ratio of the 3-methyltetrahydrophthalic anhydride to the 4-methyltetrahydrophthalic anhydride ranges from 7:3 to 3:7. A viscosity of the low-viscosity hardener ranges from 30 cps to 50 cps.

To provide a polyimide film with excellent retardation (Rth) and laser peelability, and a resin composition for forming the same. [Solution] A resin composition comprising a resin of a structural unit represented by general formula (9), wherein P4 comprises a structural unit derived from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 9,9-bis(3,4-dicarboxyphenyl)fluorene dianhydride (BPAF), P3 represents a divalent organic group, and p represents a positive integer. TIFF2026123092000102.tif34151

To stably reduce the viscosity of a raw material mixed liquid for an epoxy resin used for an electric apparatus in an insulating resin material.SOLUTION: The acid anhydride of the curing agent liquid contains hexahydrophthalic anhydride and 4-methylhexahydrophthalic anhydride, and the weight ratio of 4-methylhexahydrophthalic anhydride is equal to or more than that of hexahydrophthalic anhydride.SELECTED DRAWING: Figure 1

The invention discloses an oxygen reduction reaction catalyst with an axial nitrogen coordination iron monatomic structure and a low-temperature preparation method thereof.The low-temperature preparation method comprises the steps that benzoic anhydride derivatives, iron salt, other non-iron metal salts, a nitrogen source, a carbon source and ammonium salt are added into a mortar and ground and mixed uniformly, and a precursor is obtained; putting the obtained precursor into a muffle furnace, carrying out heat treatment at 140-250 DEG C for 0.5-3 hours, and taking out and cooling after the heat treatment is finished; grinding into powder, washing the powder, and drying in vacuum to obtain the oxygen reduction reaction catalyst with the axial nitrogen coordination iron monatomic structure. The catalyst has excellent ORR performance in an alkaline medium, and the catalytic activity of the catalyst is superior to that of a commercial Pt / C catalyst; and the catalyst has good stability, and is suitable for being used as a catalyst in proton exchange membrane fuel cells and metal-air cells. The catalyst disclosed by the invention is prepared by adopting a low-temperature solid-phase synthesis method, reaction in a protective atmosphere is not needed, and high-temperature heat treatment is also not needed, so that the preparation method is simple, and the energy consumption is remarkably reduced.

The invention provides a synthesis method of tert-butyl peroxybenzoate, and belongs to the technical field of chemical synthesis. The synthesis method of tert-butyl peroxybenzoate provided by the invention comprises the following steps: S1, a tert-butyl hydroperoxide aqueous solution, a catalyst and an active agent are mixed and stirred for a reaction, the catalyst is quaternary ammonium salt or crown ether, and the active agent is a nitrogen-containing heterocyclic compound or triethylamine; s2, cooling a reaction system after the reaction in the step S1, then respectively dropwise adding an organic solvent solution of benzoic anhydride and a sodium hydroxide aqueous solution into the cooled reaction system, and mixing and reacting to obtain a reaction solution; and S3, carrying out filtration, water washing, liquid separation and reduced pressure distillation on the reaction liquid in the step S2 to obtain tert-butyl peroxybenzoate. The synthesis method provided by the invention improves the purity and yield of the tert-butyl peroxybenzoate product.