4results about How to "Prevent photoaging" patented technology

The application discloses collagen tripeptide and a preparation method and application thereof, and belongs to the technical field of bioengineering. The preparation method comprises the following steps: obtaining bacillus velezensis with high collagenase yield through separation and identification, the bacillus velezensis belongs to probiotics, and high-activity collagenase is obtained through fermentation culture and purification; taking shark cartilage or blue fish skin as raw materials, and obtaining collagen tripeptide through the following steps of combined enzymolysis of alkaline protease and collagenase after pretreatment, inactivation, centrifugal separation and freeze-drying. The collagen tripeptide prepared by the application has a molecular weight of less than 500 Dalton, contains active components such as GHK tripeptide, is easy to absorb and has high safety, and can be used for preparing antioxidant products, anti-inflammatory products, memory-enhancing products or immunity-enhancing products. The application solves the problems of unsafe collagenase source and low collagen tripeptide preparation efficiency, and has a good industrial application prospect.

This invention discloses an impact-resistant polyethersulfone composite material and its preparation method. A modified polymer and a modified filler are melt-blended, and a pretreated film is prepared using a blown film process. The pretreated film and a modified nonwoven fabric are then laminated and hot-pressed to obtain the impact-resistant polyethersulfone composite material. The modified polyethersulfone is formed by the stepwise polymerization of 4,4'-difluoro-diphenyl sulfone and a dihydroxy monomer, and then hindered amine structures are grafted onto the molecular side to obtain the modified polymer. The hindered amine structures can capture free radicals, improving the material's anti-aging properties, while the disulfide bond structure can absorb energy when the material is impacted, enhancing its impact resistance. A modified filler is prepared by coating a composite filler formed from TiO2 and CeO2 with silica, which can efficiently absorb and convert ultraviolet light, improving the material's anti-aging properties. Simultaneously, the interlayer nonwoven fabric structure effectively prevents cracks from directly penetrating to adjacent layers, enhancing the material's impact resistance.

The invention belongs to the technical field of oil paints, and discloses an anti-aging and anti-cracking water-based oil paint, which is prepared from the following components in parts by mass: 15 to 30 parts of pigment, 15 to 25 parts of modified linseed oil, 30 to 55 parts of acrylic resin emulsion, 0.5 to 1 part of PH regulator, 0.5 to 1.5 parts of thickening agent, 1 to 3 parts of nano filler, 0.2 to 0.6 part of anti-aging agent, 0.1 to 0.3 part of preservative and 10 to 20 parts of water. The modified linseed oil is formed by carrying out graft modification on linseed oil and an acrylate monomer; the acrylic resin emulsion is a specific monomer copolymer. Through the synergistic compatibility of the acrylate modified linseed oil and the acrylic resin emulsion, and in combination with the nano filler and the composite anti-aging agent system, the pigment film has good flexibility, uniform film-forming property and structural stability under a thick coating condition, meanwhile, the oxidation resistance and yellowing resistance are improved, and the generation of cracks is effectively inhibited. The oil paint has both aging resistance and cracking resistance.

The invention provides a stainless steel foil surface waterproof roll and a preparation method and application thereof, and belongs to the technical field of waterproof materials. The stainless steel foil surface waterproof coiled material sequentially comprises a stainless steel foil, an epoxy modified bonding transition layer, a modified glass fiber base, modified asphalt and a high-molecular polymer film from top to bottom, and the modified glass fiber base is obtained by modifying the glass fiber base through an epoxy modified bonding agent. Through a multi-layer composite structure of the stainless steel foil, the epoxy modified bonding transition layer, the modified glass fiber base, the modified asphalt and the high-molecular polymer film, a chemically compatible and physically entangled reinforced interface is constructed, and the key problems that a traditional metal surface waterproof roll is weak in interlayer bonding and easy to peel off are cooperatively solved; the overall performance of the waterproof roll is remarkably improved.