33results about How to "Not yellowing" patented technology

The invention relates to the technical field of materials for synthetic leather, in particular to weak solvent aliphatic polyurethane resin for synthetic leather and a preparation method thereof. The weak solvent aliphatic polyurethane resin for synthetic leather is prepared from the following components by weight percent: 2-30 percent of aliphatic diisocyanate compound, 5-40 percent of polyester or polyether polyalcohol compound, 0-10 percent of micromolecule polyol chain extender, 0.1-13 percent of micromolecule polyamine chain extender, 0.01-1.0 percent of catalyst, 0.05-5.0 percent of assistant and 45-85 percent of organic mild solvent. The invention also discloses the preparation method of the weak solvent aliphatic polyurethane resin for synthetic leather. By adopting the technical scheme, the polyurethane resin with different solid contents, different viscosities and different modulus can by synthesized, the requirement of the synthetic leather is satisfied, and the synthetic leather product with high temperature resistance, cold resistance, anti-sticking performance and better external tensility of pigment can be prepared.

The invention discloses a normal-temperature-curing epoxy resin flexible pouring sealant and relates to the technical field of polymer materials. The normal-temperature-curing epoxy resin flexible pouring sealant is prepared by mixing a component A and a component B in equal parts by weight, wherein the component A comprises 60-90 parts of epoxy resin, 10-30 parts of reactive diluent, 5-10 parts of a plasticizer, 1-5 parts of a silane coupling agent, 0.5-2 parts of a defoaming agent, 0.5-2 parts of an antioxidant and 0.5-1 part of an ultraviolet absorber; and the component B comprises 1-3 parts of an accelerator, 30-60 parts of polyether amine and 0-50 parts of modified amine prepolymer I and 0-55 parts of modified amine prepolymer II. The ambient-curing epoxy resin flexible pouring sealant has the characteristics that the pouring sealant can be rapidly cured under the room temperature condition and is especially suitable for pouring LED flexible strips and the cured substance has better flexibility and higher elongation at break and transparency and the like and is suitable for pouring and sealing the surfaces of products having requirements on flexibility and transparency, for example, surface coating of LED flexible strips, LED module strips, flexible circuit boards and the like.

The invention discloses a preparation method of a special titanium dioxide for an oily system. The method comprises the following steps: 1, pulping to prepare a titanium dioxide suspension slurry, adding a dispersant, dispersing, and grinding; 2, diluting the ground titanium dioxide suspension slurry, and filtering; 3, adding a zirconium compound, curing, and depositing; 4, adding an aluminum compound, curing, and depositing; 5, adjusting the pH value, and curing; and 6, washing, drying, and carrying out airflow crushing. The method allows the surface of a titanium dioxide particle to be respectively coated with a zirconium oxide film and an alumina film inside out and a silane coupling agent hydrolysate to be adopted to carry out organic treatment, so the special titanium dioxide has the advantages of substantially-increased weather resistance, lipophilicity and luster, low oil absorption, good dispersity, realization of the hiding capability same to import titanium dioxide, high contrast rate, good temperature resistance, and no ink layer yellowing.

The invention relates to a methyl methacrylate(MMA) floor coating capable of rapidly solidifying. The methyl methacrylate(MMA) floor coating capable of rapidly solidifying can be prepared by two steps. First of all, according to a certain proportion, methyl methacrylate(MMA), butyl acrylate (BA), acrylic acid (AA) and benzoyl peroxide (BPO) are put into a reactor provided with a thermometer, a condenser and a stirrer for water bath heating to prepare an acrylate prepolymer for standby use; then at room temperature, a proper amount of the acrylate prepolymer is dissolved and diluted with a certain amount of MMA and BA, talcum powder, liquid wax, an auxiliary agent, an initiator and a solidifying accelerator are added, and fully stirred to obtain the floor coating, and the floor coating is prepared on site during construction, and can solidify 1 hour after the pavement. The MMA floor coating is short in solidifying time, less affected by temperature, excellent in performance, green, environmentally friendly, and wide in adaption field.

The invention discloses a modified polyurethane acrylic resin, which is prepared by polymerization among hydroxyl acrylate, diisocyanate, alkylated 4,4'-dicyclohexanol, and polyester/polyether glycol. The invention provides a method of preparing the modified polyurethane acrylic resin at the same time. The provided modified polyurethane acrylic resin does not contain active functional group such as phenyl ring, amino group, or the like, so the modified polyurethane acrylic resin will not become yellow even if the modified polyurethane acrylic resin is irradiated by light, and the weatherability is good. The resin can be applied to an adhesive, and has a good waterproof performance, good anti-falling performance, good drug resistant property, and excellent thermal stability.

The invention provides a high-water-resistant colorful stone-like paint which comprises the raw materials of, by mass, 5-12 parts of ethylene glycol mo nobutyl ether acetate, 70-130 parts of sintering color sand, 3-8 parts of heavy calcium carbonate, 20-24 parts of silicone acrylic emulsion, 0.5-2.5 parts of water repellent, 5-10 parts of thixotropic agent, 2.5-8.5 parts of mildew preventive, 1-8 parts of kaolin, 4-9 parts of anti-freezing agent, 2-6 parts of dispersing agent and 30-50 parts of water. The high-water-resistant colorful stone-like paint has the advantages that the prepared stone-like paint product is large in film hardness, free of water blush phenomenon, capable of preventing yellowing, high in bonding strength and good in weather resistance; the construction performance, the crack resistance, the acid and base resistance, the corrosion resistance and the like are excellent, and the stone-like paint is non-toxic, odourless, free of radioactive contamination and harm to human body, safe and environment-friendly.

The invention discloses a high-transmittance packaged LED which comprises a substrate, a light emitting element, a lead unit and a heat-resistant layer. The light emitting element is formed on the substrate; the lead unit is connected with the substrate and the light emitting element; and the heat-resistant layer is at least formed on the light emitting diode and comprises light-transmitting silicon resin and 0.1%-10% of epoxy silicane by weight. Therefore, the heat-resistant layer is good in adhesive effect, high in transmittance, yellowing-free and capable of prolonging the service life of the high-transmittance packaged LED.

The invention discloses a flame-retardant antibacterial antiviral mildew-proof moisture-proof mattress and a preparation method thereof. The flame-retardant antibacterial antiviral mildew-proof moisture-proof mattress comprises an intrinsically flame-retardant antibacterial antiviral waterproof fabric cover, flame-retardant short fiber 3D upright cotton and a flame-retardant PE short pipe layer. The intrinsically flame-retardant antibacterial antiviral fabric cover is a high-precision fabric formed by blending and weaving flame-retardant filaments and PLA antibacterial fibers based on PHBV. The flame-retardant short fiber 3D upright cotton is of a three-dimensional disordered node-free multi-layer fiber net-shaped structure which is formed by weaving flame-retardant polyester short fibers through a 3D non-woven technology. The flame-retardant PE short pipe layer is of a disordered net-shaped three-dimensional structure formed by processing flame-retardant PE short pipes through a non-woven technology. The flame-retardant antibacterial antiviral mildew-proof moisture-proof mattress disclosed by the invention has the advantages of being good in air permeability, easy to clean, easy to air, not easy to deform, capable of absorbing moisture and releasing sweat, and not prone to bacterium propagation. The mattress can be made into a three-folding cushion, is easy to store and can be widely applied to places such as families, hotels and student dormitories.

The invention provides an insert injection moulding decoration transfer printing foil with anti-yellowing performance. The insert injection moulding decoration transfer printing foil with anti-yellowing performance comprises a base film layer, a release layer, a color layer, an aluminium coated layer, and an adhesive layer which are laminated successively; the color layer is prepared from, by weight, 10 to 25 parts of low density polyethylene, 10 to 20 parts of high density polyethylene, 1 to 10 parts of polyurethane acrylate, 1 to 5 parts of epoxy acrylate, 1 to 10 parts of trimethylolpropanetriacrylate, 8 to 12 parts of methyl methacrylate, 20 to 60 parts of n-butyl methacrylate, 1 to 10 parts of polyethylene wax powder, 10 to 20 parts of polyamide, 10 to 25 parts of a diluent, 10 to 20parts of titanium dioxide, 0.1 to 2 parts of a dispersant, 1 to 30 parts of an anti-corrosive pigment, 5 to 10 parts of a toughening auxiliary agent, and 3 to 8 parts of an anti-yellowing auxiliary agent. According to a preparation method, acrylic resins of different amounts and different kinds are adopted so as to obtain the novel color layer; the toughening auxiliary agent and the anti-yellowing auxiliary agent are added, so that yellowing is avoided under certain heating requirements, and the anti-yellowing performance is improved greatly.

The invention relates to an adhesive as well as a preparation method and application thereof. The adhesive is prepared from the following components in parts by weight: 94-99.5 parts of waterborne polyurethane dispersion, 0.5-5 part of a wet adhesion promoter, 0.03-0.08 part of a defoaming agent, 0.1-0.3 part of a wetting agent and 0.1-1 part of a thickening agent; the hydroxyl content of the waterborne polyurethane dispersion is 3-5mgKOH/g, and the molecular weight of the waterborne polyurethane dispersion is 150000-250000 Daltons; the wet adhesion promoter is alcohol ether, alcohol ether ester or polyoxyethylene polyoxypropylene polyether which has a destabilization effect on an polyurethane emulsion and has a plasticizing effect on an adhesive film. The water-based adhesive disclosed bythe invention is suitable for being applied to composite edge folding of luggage leather products, vamps, furniture mattresses and the like which are rapidly shaped.