51results about How to "High curing activity" patented technology

The invention relates to low-refractive optical fiber coating resin. The low-refractive optical fiber coating resin is prepared from, by weight, 30-65% of prepolymer A, 0-40% of prepolymer B, 2-8% of a photoinitiator, 20-40% of an active diluent and 0.5-2% of a silane coupling agent, and the sum of the weight percentages of all the components is 100%. The low-refractive optical fiber coating resin is high in adhesive power, optical fiber is not likely to be broken when bent, and the low-refractive optical fiber coating resin is low in refractive rate and can enlarge the digital transmission aperture of the optical fiber.

The invention provides a piperazine epoxy resin curing agent and the prepared epoxy resin composition and application. The raw materials for the preparation of the curing agent are polyfunctional glycidyl ether, alcohol solvent and anhydrous piperazine. The curing agent has high reactivity at low temperature and normal temperature, and has good strength and weather resistance after reacting with the composition composed of epoxy resin. The curing agent provided by the invention can be widely used in the fields of construction emergency repair in winter, fast electronic packaging materials and adhesives.

The invention belongs to the technical field of polyester powder coating preparation, and in particular relates to a long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and a preparation method. The main raw materials of the powder coating of the present invention are: 530-560 parts of polyester resin, 45-60 parts of TGIC, 10-15 parts of trimesic acid triglycidyl ester, 120-180 parts of titanium dioxide, and 80-120 parts of barium sulfate , 8‑12 parts of brightening agent, 7‑10 parts of leveling agent. The polyester resin used in the powder coating of the present invention has a good linear structure, which ensures excellent fluidity; the powder coating uses a larger amount of trifunctional curing agent TGIC, and is matched with triglycidyl trimesic acid with a low melting point and excellent water resistance Esters are used as low-temperature curing agents to further improve the crosslinking density and water resistance of the coating film, and finally ensure long-term weather resistance and chloride salt corrosion resistance. The final powder coating product can be used for low-temperature curing at 160°C. The coating film prepared by it has good long-term weather resistance and chlorine salt corrosion resistance, and is especially suitable for infrastructure spraying on highways such as guardrails and bridges.

The invention discloses a double-component condensed type RTV silicone rubber curing accelerator which is obtained by mixing cross-linking agent, catalyst and catalyst promoter by a certain ratio; the invention also discloses curing agent which contains the curing accelerator and the application of the curing agent in silicon rubber preparation. The curing accelerator of the invention can effectively improve the curing speed and the silicon rubber performance after curing.

The invention discloses a DOPO-based s-triazine ring hydrogenated benzimidazole epoxy curing agent and a preparation method thereof. Its preparation method first mixes solvent I, cyanuric chloride, p-hydroxybenzaldehyde and an acid-binding agent, feeds nitrogen, and heats the reaction to obtain 2,4,6-tris(4-formylphenoxy)-1, 3,5‐s-triazine ring; mix solvent Ⅱ, 2,4,6-tris-formylphenoxy-1,3,5-s-triazine ring and DOPO, blow nitrogen into it, and react to obtain DOPO-based aldehyde phenoxy-1,3,5-s-triazine ring; DOPO aldehyde-phenoxy-1,3,5-s-triazine ring was dissolved in solvent Ⅲ and added dropwise to o-phenylenediamine and solvent Ⅲ A catalyst is added into the mixture to react to obtain a DOPO-based s-triazine ring hydrogenated benzimidazole epoxy curing agent. The cured product of the present invention passes the UL94V-0 level in vertical combustion, and the glass transition temperature and tensile strength are respectively increased by 12.1% and 18.2% compared with non-flame retardant epoxy resin.

The invention discloses a hydroxyl-contained alicyclic epoxy resin and a preparation method thereof. The preparation method comprises the following steps of: mixing a hydroxyl compound with 3,4-epoxycyclohexane carboxylic acid methyl ester; then adding a catalyst and evenly mixing; and heating at 80-150 DEG C for reaction for 3-8 hours in the presence of inert gas shield to obtain the hydroxyl-contained alicyclic epoxy resin. According to the invention, an accelerator is not needed to be added in the solidifying process of the hydroxyl-contained alicyclic epoxy resin, and moreover, the chemical modification performance is good. Solidified products have good heat resistance and mechanical property.