30results about How to "Does not affect heat resistance" patented technology

The invention belongs to liquid molding resin-base composite material surface abrasion resistance technology, and relates to a method for enhancing surface abrasion resistance by preforming an abrasion-resistant layer on a liquid molding composite material surface. The method comprises the following steps: preparing an abrasion-resistant layer prepreg from an abrasion-resistant resin matrix and reinforcing fibers or fabric thereof, carrying out prepolymerization on the abrasion-resistant layer prepreg at 100-150 DEG C, directly attaching the prepolymerized prepreg onto a dry fiber preformed body surface, and carrying out co-curing and molding with the dry fiber preformed body by a liquid molding technique. The resin matrix used by the abrasion-resistant composite material can be structurally compatible with the present typical liquid molding matrix resin for aviation on the molecular level, and participates into the curing reaction of the resin; and the heat resistance, mechanical properties and molding processibility of the original matrix resin and composite material thereof can not be influenced.

The invention discloses a method for preparing a modified carbon nanotube and ferrite and polyimide composite absorbing material. The method comprises the following steps of: modifying carbon nanotubes by using argon plamas, and preparing the modified carbon nanotubes and ferrite into composite powder by using a chemical coprecipitation method; and preparing the composite powder, 4,4-dioctyldiphenylamine and pyromellitic dianhydride into the modified carbon nanotube / ferrite / polyimide composite absorbing material by using an in situ polymerization method. The method has the advantages that: onthe premise of not influencing good heat resistance of polyimide, the mechanical properties of the composite material are improved, and the light and high-frequency absorbing material is prepared. Bythe method for preparing the modified carbon nanotube and ferrite and polyimide composite absorbing material, the mechanical properties of the composite material are improved, and the prepared composite material with wave-absorbing performance can be widely applied to the field of aerospace.

The invention provides a diaphragm, a preparation method thereof and a lithium ion battery containing the diaphragm. The diaphragm includes a polymer matrix and a slurry layer located inside and on the surface of the matrix. The slurry layer contains ceramic particles and a cured resin. The cross-linked resin is obtained by cross-linking and curing reaction, the diaphragm has excellent high temperature resistance, the heat-resistant layer is not easy to fall off, it is easier to wind, easier to prepare, and easier to practical application.

An ester cyanate resin system with organic titanium epoxy resin as catalyst is characterized by taking organic titanium modified epoxy resin as catalyst, which is obtained by reacting tetrabutyl titanate with hydroxyl in glycidol ether epoxy resin structure, and consisting of ester cyanate resin 70-99.99% and organic titanium epoxy resin catalyst 0.01-30%. It can improve curing process of resin system, lower curing temperature, shorten curing time and cost low.

Disclosed is a polycarbonate composition, comprising the following components in parts by weight: a. 30.4 parts to 80.2 parts of polycarbonate; b. 8.4 parts to 49.6 parts of a butadiene copolymer; c. 5.4 parts to 25.2 parts of a flame retardant; and d. 0 parts to 9.6 parts of other additives, where the sum of the parts by weight of the four components, a, b, c, and d, is 100 parts. In the present invention, by selecting the butadiene copolymer composition to be in the formula of the polycarbonate composition, where the structure of a polybutadiene copolymer in the composition is a large sea-island structure rubber phase, 1 to 50 small sea-island structures are present within the large sea-island structure rubber phase, and, when the diameter ratio of 90% or more of the large sea-island structure rubber phase to the small sea-island structures therein of the least diameter is 1.01-80, the impact strength of the polycarbonate composition can be significantly increased without affecting the flame retardancy, fluidity, and heat resistance of the composition, which is especially suitable in scenarios of increase requirements on the use environment.

The invention discloses a flame-retardant heat-insulating polyvinyl chloride foam material and a preparation method thereof, belongs to the technical field of foam materials, and aims to solve the problems of relatively poor heat-insulating performance and relatively poor heat resistance of the foam materials since flame retardants added into the foam materials are mostly organic small molecular substances and are added in a large quantity, and the heat conductivity of the foam materials are difficult to lower in the prior art. The polyvinyl chloride foam material is prepared from the following components in parts by weight: 100 parts of polyvinyl chloride resin, 0 to 80 parts of acid anhydride, 0 to 20 parts of epoxy compound, 30 to 150 parts of isocyanate, 1 to 15 parts of foaming agent, 0 to 4 parts of catalyst, 0 to 3 parts of surfactant, 0.5 to 10 parts of antimony trioxide, and 0.1 to 5 parts of graphite powder of 100 to 15,000 meshes. The foam material has good flame retardant property, low heat conductivity, and superior heat-insulating performance and heat resistance.

The invention discloses an over-current over-voltage protective element and a manufacture method thereof. The over-current over-voltage protective element comprises a bearing plate, a fuse, an upper cover plate and end electrodes. A middle electrode of the bearing plate is divided into at least three isolated areas. The fuse covers the middle electrode so that the mutually isolated areas of the middle electrode are electrically connected. The upper cover plate is in a channel structure open to the bearing plate, and an open end of the upper cover plate is adhered with the bearing plate to form a cavity. The end electrodes are disposed on two sides of the bearing plate and the upper cover plate so that an upper electrode, the middle electrode and a lower electrode are electrically connected. The over-current over-voltage protective element made of high-temperature-resistant polymer material has unaffected heat resistance and is also well heat-insulating. The fuse is directly connected with the electrodes by vacuum sputtering, vacuum evaporation or plating, and drifting of the fuse caused by partial melting of the melt after being heated is avoided. A gap is added above the fuse, so that the melt fuse can be well absorbed by the gap and no tin arch occurs.

The invention provides a polyimide resin with self-repairing function, a polyimide film, a preparation method and a flexible foldable display screen cover plate base film, and relates to the field of material technology. The polyimide resin is mainly made of raw materials such as diamine monomer, dianhydride monomer, end-capping agent, dehydrating agent and catalyst. Among them, furfurylamine and maleic anhydride are used as end-capping agents, which can be used in polyimide The structure of conjugated diene and substituted olefin is introduced into the main structure of the resin. Based on the dynamic reversible Diels-Alder reaction, the cyclohexene structure is cracked at a higher temperature to generate furfurylamine and maleic anhydride, and furfurylamine and maleic anhydride are generated during the cooling process. The amine and maleic anhydride react spontaneously to produce a cyclohexene structure, thereby realizing self-healing of the polyimide resin. The present invention also provides a polyimide film with self-repair function, which is made of the above-mentioned polyimide resin. The polyimide film has self-repair function, and the repair effect does not decrease with the increase of repetition times.

The invention relates to the field of micro-electronic packaging materials, and discloses bismaleimide containing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and asymmetric in molecular structure, as shown in a general formula (II) shown in specification, as well as a preparation method and application of the bismaleimide in preparation of composite resin. The bismaleimide containing DOPO and asymmetric in molecular structure disclosed by the invention is soluble in such conventional organic solvents as acetone, so as to facilitate processing and using; the bismaleimide containing DOPO and asymmetric in molecular structure disclosed by the invention can be used for further preparing cyanate ester composite resin, and a cured product is good in thermal stability and flame retardance; and as a base material for packaging in the micro-electronic packaging field, the bismaleimide has good application prospect.