9results about How to "Reduce crosslink density" patented technology

The invention discloses an ultraviolet curing organic silicon adhesive, a preparation method and application, and belongs to the technical field of high polymer materials. Wherein the adhesive comprises a sulfydryl organic silicon material, an acrylate organic silicon material, vinyl modified polyvinyl chloride and other components, and the preparation method comprises the following steps: S1, preparing the vinyl modified polyvinyl chloride; s2, preparation of sulfydryl organic silicon grafted vinyl modified polyvinyl chloride; and S3, preparing the ultraviolet light curing organic silicon adhesive. According to the prepared ultraviolet curing organic silicon adhesive, a sulfydryl organic silicon material is grafted to vinyl modified polyvinyl chloride through a thiol-ene reaction, and acrylate organic silicon is connected, so that the light curing speed, the high and low temperature resistance and the adhesion of the adhesive are remarkably improved. The invention solves the problems of low curing speed and poor adhesive property caused by poor compatibility of polyvinyl chloride and an organic silicon material, and has the potential of being applied to preparation of a pressure-sensitive adhesive, a sealing adhesive, a laminating adhesive and a pouring sealant.

The application provides a polyvinyl alcohol / chitosan composite compression hemostatic sponge with bacteriostatic function and a preparation method thereof, and belongs to the technical field of medical materials.The polyvinyl alcohol / chitosan composite compression hemostatic sponge with bacteriostatic function comprises a double-network hydrogel structure formed by carboxymethyl chitosan and aldehyde-based polyvinyl alcohol; the double-network hydrogel structure has high stability and fixity, so that the composite compression hemostatic sponge has excellent stability.The raw materials used in the application include carboxymethyl chitosan, aldehyde-based polyvinyl alcohol and antibacterial peptide, which are connected through covalent bonds and ionic bonds to form a double-network hydrogel structure.By introducing gallic acid and copper chloride, a metal-organic network structure can be formed, which can further improve the mechanical stability of the composite compression hemostatic sponge and further improve the antibacterial performance of the composite compression hemostatic sponge.

The application discloses a kind of high filling plant fiber reinforced epoxy vegetable oil-based glass-like high molecular composite material and preparation method thereof, and is prepared according to the following steps: (1) the synthesis of aldehyde group-containing intermediate: epoxidized vegetable oil is reacted with aldehyde group-containing compound in the presence of catalyst to obtain aldehyde group-containing intermediate; (2) melt premixing: aldehyde group-containing intermediate obtained in step (1) is melt mixed with dry plant fiber at 140~180 °C; (3) prepolymer formation: diamine compound is added to the mixture of step (2), wherein the molar ratio of amino group to aldehyde group is (1.1~1.6):1, and the mixture is continuously reacted to form a prepolymer; (4) curing forming: the prepolymer obtained in step (3) is subjected to mold forming and curing treatment to obtain a composite material. The application significantly improves the comprehensive performance of epoxy vegetable oil-based composite material, and the raw material source is extensive, and the process is green and environmentally friendly, which has wide application prospect in the field of recyclable high-performance structural materials.

This invention relates to the field of polymer materials, and discloses a grafted modified polyethylene, its preparation method, and its applications. The grafted polyethylene comprises polyethylene molecular chains and vinyl side chains grafted onto the polyethylene molecular chains; wherein the vinyl content in the polyethylene is 5-10 / 1000C, and the crosslinking density of the polyethylene is less than or equal to 2.3 × 10⁻⁶. ‑4 mol / mL. Polyethylene contains a high content of crosslinkable vinyl double bonds while having a low degree of crosslinking. This allows for a significant improvement in crosslinking performance while greatly reducing the amount of crosslinking initiator required, thereby ensuring that the resulting cable possesses excellent heat resistance, electrical properties, and mechanical properties.

The invention belongs to the technical field of waterproof coiled material preparation, and particularly relates to a weather-resistant polyethylene waterproof coiled material and a preparation method thereof. Epoxy functionalized polytetrahydrofuran ether glycol is doped into traditional bisphenol A-based epoxy resin, poly epsilon-caprolactone particles and fumed silica are added to prepare an adhesive, and the adhesive is combined with a polyethylene base material to obtain the weather-resistant polyethylene waterproof coiled material. The polytetrahydrofuran ether glycol and the poly epsilon-caprolactone particles synergistically improve the anti-aging performance and the waterproof performance of the adhesive, and the fumed silica improves the strength reduction of the epoxy resin in the modification process and improves the rheological property, so that the coiled material can meet the application requirements of outdoor and wet base layers and other harsh working conditions.

The invention discloses an OCA (Optical Clear Adhesive) full-lamination optical adhesive and a preparation method thereof, belongs to the technical field of optical adhesives, and aims to provide an optical adhesive with high optical performance, excellent flexibility and self-repairing capability. The optical cement is prepared by single-sided ultraviolet light gradient initiation curing of a prepolymer system consisting of a soft monomer, a hard monomer, a functional monomer, a dynamic cross-linking agent, a photoinitiator, an ultraviolet light absorber and a silane coupling agent. Through a light intensity depth attenuation effect caused by competitive light absorption of the ultraviolet light absorber, a gradient network structure of which the crosslinking density is continuously decreased progressively along the thickness direction is formed in situ in a single adhesive layer; a disulfide bond is introduced into a polymer network through a dynamic cross-linking agent, so that the material is endowed with self-repairing and stress relaxation functions.

The application discloses a resin composition, an electrical insulating part prepared from the resin composition and a preparation method of the electrical insulating part. The resin composition for the electrical insulating part of the application is composed of the following components in parts by weight: 70-90 parts of bisphenol A type epoxy resin, 10-30 parts of alicyclic epoxy resin, 45-65 parts of a curing agent, 300-500 parts of a heat-conducting filler and 5-30 parts of a toughening agent OX; the toughening agent OX is a bisphenol A type epoxy resin containing an oxazolidone structure. The special epoxy resin toughening agent containing an oxazolidone structure is added in the formula, the use of the alicyclic epoxy resin is reduced, and a formula with a higher Tg is obtained.

The present application belongs to the technical field of decorative panel preparation, and particularly relates to a high-wear-resistance decorative panel and a preparation process thereof. The high-wear-resistance decorative panel comprises a substrate layer, a decorative layer and a wear-resistant surface layer, and the wear-resistant surface layer contains modified wear-resistant particles. The modified wear-resistant particles are prepared by reaction of wear-resistant particles and a bridging agent, and the bridging agent is synthesized by reaction of 2-phenylbenzimidazole and bromophenylboronic acid. In the present application, the wear-resistant particles are chemically modified by the bridging agent, so that the wear-resistant particles are connected to the bridging agent through a borate ester bond, and then react with a resin matrix to form a chemical bond, thereby firmly anchoring the modified wear-resistant particles in the resin matrix. The dynamic reversible characteristics of the borate ester bond at the hot-pressing temperature enable the wear-resistant particles to directionally migrate to the stress concentration area of the surface layer during the hot-pressing process, thereby forming a surface-enriched distribution structure and significantly improving the wear resistance of the decorative panel. A flexible buffer layer is formed in the bottom layer area, thereby effectively releasing internal stress and avoiding surface cracking.

The present application relates to the technical field of impregnated film paper veneer plywood, in particular to a preparation method of a crack-proof impregnated film paper veneer plywood, which comprises the following steps: S1. preparation of modified melamine; S2. preparation of modified melamine-formaldehyde resin solution; S3. preparation of modified melamine-formaldehyde resin adhesive; S4. impregnation-glue impregnation of impregnated film paper; S5. generation of veneer plywood. The adhesive modifier realizes uniform dispersion of nano-filler and synergistic enhancement of external toughening, and synergistically acts with the polyester modifier to improve the mechanical properties of the overall coating. In the system synergistically acting with the polyester modifier, the adhesive modifier and the modified acrylic ester adhesive, the veneer layer can be deformed in coordination with the wood substrate, significantly overcoming the technical bottleneck of easy cracking of traditional products in dry or cold areas, and the product adaptability is wide, and the durability is significantly better than that of the veneer plywood produced by the traditional process.