48results about How to "Extend high temperature service life" patented technology

The invention relates to a thermal / environment barrier coating based on a ceramic composite material and a preparation method of the thermal / environment barrier coating. The thermal / environment barrier coating comprises a silicon layer, a ytterbium silicate layer, a transition layer and a hafnium oxide layer in sequence from inside to outside, wherein the transition layer is made by mixing hafniumoxide and ytterbium silicate. The preparation method comprises the following steps: respectively loading silicon powder, ytterbium silicate powder and hafnium oxide powder into a powder conveyer of low-pressure plasma spraying equipment, and carrying out drying treatment; immobilizing a ceramic composite material on a rotating platform in a vacuum chamber of the low-pressure plasma spraying equipment; preparing the silicon layer, the ytterbium silicate layer, the transition layer and the hafnium oxide layer in sequence on the surface of the ceramic composite material by using a low-pressure plasma spraying method to obtain the thermal / environment barrier coating on the surface of the ceramic composite material. The thermal / environment barrier coating provided by the invention is good in thermal insulation effect and excellent in high-temperature moisture corrosion resistance, and the preparation method provided by the invention has the advantages of being high in deposition efficiency, low in cost, uniform in coating and the like, and the thermal / environment barrier coating can be rapidly and integrally prepared.

The invention relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt prepared therefrom. The preparation method is as follows: blending modified polyphenylene sulfide fibers and polytetrafluoroethylene fibers and performing acupuncture or water The modified polyphenylene sulfide is a polyphenylene sulfide in which each sulfur atom is randomly connected to N oxygen atoms, and the molar ratio of oxygen atoms to sulfur atoms in the modified polyphenylene sulfide is It is 1.50~1.77:1. After the prepared heat-resistant filter felt is subjected to thermo-oxidative aging for 100 hours under air conditions at a temperature of 280° C., the tensile strength retention rate is above 90%. The composite filter felt made from it is mainly composed of a base cloth and a heat-resistant filter felt compounded with the base cloth. The preparation method of the present invention has simple process and low cost; the prepared heat-resistant filter felt has excellent heat resistance; the composite filter felt made of the heat-resistant filter felt has excellent heat resistance and mechanical properties, and has great application prospects .

The invention relates to a single-component high-temperature self-crosslinking waterborne polyurethane preparation method. Single-component high-temperature self-crosslinking waterborne polyurethane is prepared by copolymerization of alkenyl end capped waterborne polyurethane, alkenyl oxazoline and acrylate monomer, wherein the use amount of the alkenyl oxazoline is 1 to 40% of the total amount ofresin. A solid content of prepared emulsion polymer is 15 to 60%, a pH value is 6 to 8, and a molecular weight is 10000 to 200000. According to the preparation method disclosed by the invention, oxazoline radicals are introduced into a waterborne polyurethane structure through copolymerization of the polyurethane, the alkenyl oxazoline and the acrylate; no crosslinking agent is utilized; comparedwith normal-temperature self-crosslinking waterborne polyurethane, storage stability of the obtained emulsion polymer is improved, and high-temperature service life of the obtained emulsion polymer is prolonged; after film formation, the obtained emulsion polymer has excellent water resistance, acid and alkali resistance and chemical resistance; meanwhile, the obtained emulsion polymer further has excellent physical and mechanical properties of large hardness, high elasticity, scratch resistance and the like.