3results about How to "Improve water repellency" patented technology

The invention discloses a preparation method of a high-performance anti-ultraviolet water-repellent polyester fiber. The preparation method comprises the following steps: S1, preparing core-shell composite modified particles; s2, preparing a modified finishing liquid; and S3, carrying out dipping treatment on the polyester fiber by adopting the modified finishing liquid, so as to obtain the high-performance anti-ultraviolet water-repellent polyester fiber. The polyester fiber provided by the invention has excellent ultraviolet resistance and water repellency, titanium dioxide and carbon dots are adopted as main components of an anti-ultraviolet agent, and the core-shell composite modified particles with a special structural system are constructed, so that the excellent ultraviolet resistance can be provided, and the polyester fiber has excellent water repellency. The carbon dots are added into the polyester fiber, the adverse effect caused by the photocatalysis of titanium dioxide can be overcome, the water repellency of the polyester fiber can be improved through the carbon dots, the negative effect of the photocatalysis of titanium dioxide is further reduced, and the carbon dots play multiple improvement roles in the polyester fiber.

The application discloses a preparation method of a water-in-oil emulsion type defoaming agent for shale gas exploitation, which comprises the following steps: adding 32# industrial grade white oil into a beaker, adding yellow block-shaped microcrystalline wax, heating to 70 DEG C to dissolve the microcrystalline wax, adding Span 80 after uniform mixing and stirring, keeping constant temperature magnetic stirring for 10 min, keeping stirring at 70 DEG C for 30 min, adding tertiary distilled water, continuing stirring for 60 min, and finally adding 2g of 5% PVA water solution to obtain the water-in-oil emulsion type defoaming agent for shale gas exploitation. The surface active agent generated after starch modification is used to treat the surface groups, so that the silane groups are attached to the wax surface with low surface energy, are wrapped on the outer surface of the raw material through hydrogen bond or electrostatic force, the hydrophobicity is increased, the surface tension is reduced, and the defoaming purpose is achieved at the gas-liquid interface. The silicon grease material is compounded in the later stage, the silicon-containing groups can be better adsorbed on the outermost layer of the raw material, so that the defoaming is more helpful, and the defoaming rate and defoaming speed are improved.

The application discloses a kind of thermal insulation cotton felt, the thermal insulation cotton felt is formed by the glass fiber that is sprayed with adhesive solidification and drying;Adhesive is composed of the following components by weight parts: modified phenolic resin solution, methyl methacrylate prepolymers liquid modified by silicone, water, pentaerythritol, methyl emulsified silicone oil, dioctyl phthalate;Modified phenolic resin solution is obtained by the following steps: in the mixed solution consisting of phenol, dimethyl phenol, lignin, add formaldehyde, and obtain first solution under the condition of temperature 40~60 ℃ reaction;5~15 weight parts of sodium hydroxide solution is added in first solution to adjust the pH value of first solution to 8~9, and after heating, temperature is reduced to 35~50 ℃, add sulfuric acid and stir to obtain second solution;20~40 portions of hexamethylol melamine are added in second solution in batches.The thermal insulation cotton felt of the application improves the hydrophobic property of thermal insulation and sound insulation module while maintaining the resilience of glass fiber cotton felt.