6results about How to "Improve cross-linking efficiency" patented technology

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

The invention belongs to the technical field of dual-curing UV coatings, and discloses a dual-curing UV coating and a preparation method thereof, the coating is composed of a component A and a component B according to a weight ratio of 5-20: 1; the component A is prepared from the following raw materials in parts by weight; the component A is prepared from the following raw materials in parts by weight: 30 to 50 parts of aliphatic polyurethane acrylic resin, 10 to 25 parts of hydroxy acrylic resin, 0.5 to 1 part of an ultraviolet light absorber, 1 to 2 parts of an ultraviolet light initiator, 0.2 to 0.6 part of a light stabilizer, 0.1 to 0.5 part of a drier, 0.2 to 0.6 part of a stain-resistant auxiliary agent and 25 to 30 parts of a composite solvent; the component B is prepared from the following raw materials in parts by weight: 70 to 75 parts of aliphatic polyisocyanate and 20 to 30 parts of solvent. The double-heavy-component design of specific raw materials is adopted, and the obtained coating can have the flexibility of a PU coating and the hardness of a UV coating, has good hardness, weather resistance, adhesive force, chemical resistance and the like, and can be used for outdoor products; the cross-linking efficiency can be effectively improved, and the energy-saving and environment-friendly effects can be achieved.

This invention discloses a TPR (Total Physical Resin) modified silicone material with high elasticity and fast rebound, and its preparation process. It is composed of the following raw materials in parts by weight: 100-120 parts of low-vinylmethyl vinyl silicone raw rubber, 20-30 parts of fumed silica, 10-20 parts of softening and modifying agent, 2.0-3.0 parts of peroxide curing agent, and 0.5-2.0 parts of silane coupling agent. The modified silicone material has a Shore hardness of 10-22A and possesses instantaneous rapid rebound characteristics. Using low-vinylmethyl vinyl silicone raw rubber as the base material, combined with specific amounts of softening and modifying agent (10-20 parts) and fumed silica (20-30 parts), through the synergistic effect of each component, the modified silicone material can still maintain high crosslinking efficiency and network structure integrity within the soft range where the Shore hardness drops to 10-22A.

The application discloses a collagen scaffold biological patch for wound repair and a preparation method thereof, and belongs to the field of medical biomaterials. Raw materials include 90-110 parts of type I collagen, 8-20 parts of type III collagen, 3-8 parts of chondroitin sulfate, 5-15 parts of oxidized dextran, 3-8 parts of trehalose, 0.3-1.2 parts of modified boron glycol complex, 0.8-2.5 parts of EDC.HCl, 0.5-1.5 parts of NHS and 0.15-0.50 parts of genipin. The application effectively solves the problems of insufficient supporting force, excessively fast or slow degradation rate and toxicity of traditional cross-linking agents of the existing collagen scaffold biological patch, innovatively introduces the modified boron glycol complex and combines the double-layer cross-linking of EDC / NHS and genipin, constructs the collagen scaffold patch with high supporting force, controllable degradation and safety, and the patch has good cell compatibility and a wound healing promotion effect.

This invention provides a dielectric ion exchange membrane, its preparation method, and its application, relating to the field of membrane material preparation technology. The dielectric ion exchange membrane includes a substrate and an ion exchange membrane coated on the surface of the substrate. The ion exchange membrane comprises polyvinyl alcohol, an ion system, a UV-curable monomer, and a photoinitiator. By using UV curing technology, the crosslinking process and solvent evaporation can be precisely controlled during membrane formation, ensuring a smooth membrane surface and avoiding membrane curling caused by uneven shrinkage. The introduction of the UV-curable monomer is to form a crosslinked network under UV irradiation, inhibiting macroscopic structural flow and creep of the ion exchange membrane during film formation and service, improving the mechanical stability of the membrane, and forming a stable crosslinked structure, thereby forming a structurally stable dielectric ion exchange membrane and effectively preventing membrane curling during drying.

The invention discloses an irradiation cross-linked polyolefin insulating material and a preparation method and application thereof, and relates to the technical field of wire and cable materials, the irradiation cross-linked polyolefin insulating material comprises the following components by mass: 10-20 parts of polyethylene, 20-30 parts of a polyolefin elastomer, 50-70 parts of inorganic filling powder, 1-3 parts of an antioxidant, 5-8 parts of a cross-linking agent, and 1-3 parts of an initiator; the antioxidant is selected from at least one of a dialkyl hydrocarbon amine antioxidant, a benzofuranone antioxidant or a sulfo-antioxidant, and is not independently the sulfo-antioxidant; the cross-linking agent is a polyfunctional group acrylate compound, and the functionality is greater than or equal to 4. According to the invention, the specific antioxidant and cross-linking agent are adopted, so that a good cross-linking degree can be realized without high irradiation dose, and meanwhile, the color difference change before and after irradiation is reduced.