4results about How to "High functionality" patented technology

The application discloses an end hexaazido nitrate polyether adhesive and a synthesis method thereof. The method first takes triazido neopentyl alcohol and glycidyl ether nitrate as raw materials, boron trifluoride-ether complex as a catalyst, and obtains triazido neopentyl polyglycidyl ether nitrate alcohol through cation ring-opening polymerization reaction; then takes triazido neopentyl polyglycidyl ether nitrate alcohol and hexamethylene diisocyanate as raw materials, dibutyl tin dilaurylate as a catalyst, and obtains end hexaazido polyglycidyl ether nitrate through addition reaction, namely the end hexaazido nitrate polyether adhesive. The application is mainly used for solid propellants, is used for synthesizing polytriazole elastomers, improves the content and crosslinking density of hard segments, promotes microphase separation of the elastomers, and thus improves mechanical properties.

The invention provides an epoxy curing agent as well as a preparation method and application thereof. The preparation method of the epoxy curing agent comprises the following steps: carrying out first reaction on a first mixed reaction system containing amino siloxane and a chain extender to obtain an intermediate product of which the main chain contains a-Si-O-Si-bond and the side chain contains amino; performing a second reaction on a second mixed reaction system containing the intermediate product and a cross-linking agent to obtain the epoxy curing agent, wherein the cross-linking agent comprises an acid cross-linking agent. A coating film formed by the epoxy resin coating containing the epoxy curing agent has excellent high temperature resistance and good flexibility.

The invention belongs to the technical field of composite coiled materials, and particularly relates to a high-wear-resistance and mildew-proof wood-bamboo composite coiled material and a preparation method thereof. The high-wear-resistance and mildew-proof wood-bamboo composite coiled material sequentially comprises a hydrophobic modified bamboo powder layer, a mildew-proof puffed cork powder layer and a hydrophobic modified bamboo powder layer from top to bottom. According to the invention, hyperbranched polyurea with a three-dimensional spherical structure is synthesized, a large number of cavities exist in molecules, and numerous amino groups and ureido groups with high reaction activity are distributed on the periphery of the hyperbranched polyurea, and the hyperbranched polyurea is subjected to bio-based modification through vanillin; the prepared vanillin modified hyperbranched polyurea adhesive is introduced into a wood-bamboo composite coiled material with high wear resistance and mildew resistance, and hydrophobic bamboo powder and mildew-resistant cork powder can be firmly combined into a high-strength and durable integral coiled material by virtue of high bonding strength brought by a hyperbranched structure of the vanillin modified hyperbranched polyurea adhesive and an enhancement function introduced by the vanillin, so that the strength of the coiled material is greatly improved.

The application discloses a low-loss resin composition containing active ester, a prepreg and a copper-clad plate, and the resin composition contains the following main components in parts by weight: 30-70 parts of an epoxy resin, 30-70 parts of an epoxy curing agent, 0-3 parts of a curing accelerator, and 20-100 parts of a filler; wherein the epoxy curing agent is a tetraphenol fluorenyl active ester; the prepreg is prepared by immersing glass cloth in glue liquid formed by the low-loss resin composition, and then baking the glass cloth in an oven at 80-200 DEG C for 1-20 min; and the copper-clad plate is prepared from the prepreg, and the fluorine-containing tetrafunctional active ester is synthesized by esterification reaction of tetraphenol fluorene and pentafluorobenzoyl chloride, and the rigid fluorene ring structure is introduced, which is helpful to improve the thermal performance of the cured epoxy composite material; and the application effectively solves the problem of insufficient heat resistance of the resin composition used for preparing the copper-clad plate, and the amount of the filler is increased to meet the requirement of low polarity, the interface compatibility of the resin and the filler is poor, and the dielectric loss is further improved.