1341results about How to "Good yellowing resistance" patented technology

The invention relates to a composite polyether which comprises 1-3 parts of polyether polyol 330N, 0.5-1 part of polyether polyol 635H, 3-5 parts of polyether polyol DV125, 3-4 parts of benzoic anhydride polyester polyol, 0.05-0.2 part of foam stabilizer, 0.05-0.2 part of cell opener, 0.02-0.1 part of polyurethane synthetic catalyst and 0.3-0.5 part of water. The invention also relates to polyurethane rigid foam as well as a raw material composition and usage thereof. The polyurethane rigid foam material can simultaneously have excellent cell opening property, size stability, bending strength and compression mildness, thus the polyurethane rigid foam material has the effects of light weight, heat isolation, sound absorption and the like and can well meet use requirements of car roof foam. Besides, the polyurethane rigid foam also has excellent yellowness resistance and prolonged service life.

The invention relates to an epoxy resin modified water-based polyurethane emulsion and a preparation method thereof. The emulsion comprises the following components in percentage by weight: 20 to 40 percent of isophorone diisocyanate, 20 to 40 percent of polyester, 5 to 10 percent of hydrophilic chain extender, 2 to 10 percent of chain extender, 1 to 3 percent of crosslinker, 3 to 10 percent of neutralizing agent, 2 to 10 percent of epoxy resin and 10 to 20 percent of acetone. The preparation method comprises the steps of feed preparation, polyester dehydration, the synthesis and neutralization of prepolymer, and chain extension and emulsification. Compared with the prior art, the epoxy resin modified water-based polyurethane emulsion has the advantages of high hardness of film, good water resistance and solvent resistance and the like, and is widely applied in the field of packaging coatings.

An agent for treating metal surfaces which comprises an aqueous medium and, incorporated therein, (A) a cationic urethane resin which is water-soluble or in an aqueous emulsion form, (B) a cationic polycondensation product obtained from a phenol compound and an aldehyde, and (C) a zirconium compound and/or titanium compound. A coating film formed from the treating agent imparts excellent corrosion resistance and alkali resistance to a metallic material. When the proportion of the urethane resin (A) is equal to or higher than that of the polycondensation product (B), yellowing resistance can be also imparted. By incorporating a metal compound (D) containing a specific metal, excellent blacking resistance also can be imparted. Furthermore, by incorporating an acid ingredient (E) and a vanadium compound (F), a further improvement in performances can be attained.

The invention belongs to polyurethane elastomeric materials, and particularly relates to a cold-resistant high-wear-resistant polyurethane resin for synthetic leather. The technical scheme is as follows: the cold-resistant high-wear-resistant polyurethane resin for synthetic leather is characterized by mainly comprising isocyanate, polyalcohol compound, reactive silicone oil, alcohol chain extender of which the molecular weight is lower than 150, and solvent. By using the scheme, the invention overcomes the defects in the prior art, and provides a novel cold-resistant high-wear-resistant polyurethane resin for synthetic leather.

The invention discloses polyurethane matt woodenware paint. The polyurethane matt woodenware paint comprises a paint main agent component, a polyurethane curing agent component and a diluent component, wherein a weight ratio of the paint main agent component to the polyurethane curing agent component to the diluent component is 1: 0.5: 0.6. The paint main agent component comprises: by weight, 32.5 to 39 % of short-oil soybean oil alkyd resin, 9 to 15% of medium-oil castor oil alkyd resin, 2% of vinyl chloride-vinyl acetate copolymer, 3 to 5% of flatting powder and 0.3 to 1.0% of polyethylene wax. The polyurethane curing agent component comprises: by weight, 30 to 40% of toluene diisocyanate trimer and the balance an addition product of toluene diisocyanate and trimethylol propane. The diluent component comprises: by weight, 70 to 80% of butyl acetate, 10 to 20% of propylene glycol monomethyl ether propionate and 10 to 15% of propylene glycol monoethyl ether acetate. The polyurethane matt woodenware paint has the advantages of good brush coating levelability, good mechanical properties, and environmentally friendly and health characteristics.

The invention discloses a reactive polyurethane hot melt adhesive for a reflective fabric. The reactive polyurethane hot melt adhesive is prepared from polyester polyol, polyether polyol, a chain extender, high polymer polyester, an adhesion promoter, an anti-oxidant, an ultraviolet ray absorber, a stabilizing agent, isocyanate, a catalyst and a silane coupling agent. The invention also discloses a preparation method for the reactive polyurethane hot melt adhesive used for the reflective fabric. The reactive polyurethane hot melt adhesive for the reflective fabric has high initial-stage strength, good soft handle, good washing performance, solvent resistance, heat resistance, storage stability and excellent environmental protection performance and is applicable to bonding of a variety of materials including a reflective material.

The invention belongs to the field of chemical industry, and particularly discloses white finish coat photocurable UV (ultraviolet) paint and a preparation method thereof. The photocurable UV paint comprises the following components in percentage by weight: 20-60% of epoxy acrylate, 20-60% of polyurethane acrylate, 2-5% of phenyl acetone photoinitiator, 0.2-1% of diphenyl phosphine oxide photoinitiator, 0.2-1% of dispersant, 0.2-1% of leveling agent, 1-40% of titanium white TiO2, 5-15% of two-functional-group reactive diluent and 5-30% of three-functional-group reactive diluent. The paint has the characteristics of favorable gloss, adhesive force and leveling property, thus ensuring that the white UV paint can be better applied.

The invention discloses water-based polyurethane elastomer emulsion, and a preparation method and application thereof. The preparation method comprises the following steps of: (1) mixing organic diisocyanate, polyol with the molecular weight of 600-4,000, hydroxy carboxylic acid and an organotin-containing catalyst, and reacting at the temperature of between 60 and 90DEG C for 2 to 5 hours; (2) adding an active hydrogen-containing chain extender, and continuously reacting until a theoretical value of residual NCO percent is reached; (3) adding a polyhydroxy chain terminator to make the residual NCO percent equal to 0; (4) adding organic amine for neutralization reaction at the temperature of between 30 and 55DEG C, wherein the neutralization degree is 70 to 100 molar percent of hydroxy carboxylic acid; and (5) adding a crosslinking agent and water to obtain aqueous dispersion, namely the water-based polyurethane elastomer emulsion. Products prepared from the emulsion have low modulus, weak bondage feel, and high resistance to yellowing, and can be stably stored.

The invention discloses a low-energy electron beam radiation curing coating, which comprises the following components in percentage by weight: 40-90 percent of reactivity oligomer, 10-60 percent of reactivity monomer, 0.3-5 percent of additive, 0-30 percent of thermoplastic resin, 0-15 percent of photoinitiator and 0-30 percent of pigment and filler. The coating is particularly suitable for coating processing on substrate made of plastic or paper. A use method of the low-energy electron beam radiation curing coating comprises the following steps of: (a) printing at least one layer of the electron beam radiation curing coating on the plastic or paper substrate; (b) radiating the coating by adopting an electron beam of no more than 200+/-10kV; or repeating the use steps. The coating has low cost and good environment protection property. The coating obtained by using the low-energy electron beam radiation curing coating has good abrasive resistance, scratching resistance and solvent resistance.

The invention relates to a high-heat-conductivity white adhesive composition, a high-heat-conductivity white cover film made from the same and a preparation method thereof. The high-heat-conductivity white adhesive composition comprises flexible saturated polyester, hard saturated polyester, blocked isocyanate curing agent, pigment, high-heat-conductivity filler, fluorescent brightener, defoaming agent and solvent. The high-heat-conductivity white cover film comprises a high-heat-conductivity insulation basal film, a high-heat-conductivity white adhesive composition coating applied onto one side of the high-heat-conductivity insulation basal film, and a high-heat-conductivity insulation adhesive layer applied onto the other side of the high-heat-conductivity insulation basal film. By applying the heat-conduction adhesive layers onto the two sides of the high-heat-conductivity insulation basal film, the high-heat-conductivity white cover film has the advantages of high whiteness and high reflectivity of the cover film surface, low cost, favorable yellowing resistance, excellent folding resistance and high heat conductivity, and can be widely used in the fields of high-power LEDs (Light Emitting Diodes), backlight sources and the like.

The invention discloses an aromatic yellowing-proof polyurethane resin for synthetic leather and a preparation method thereof. The aromatic yellowing-proof polyurethane resin comprises the following raw material components: aromatic isocyanate, polylol compound, diol chain extender of which molecular weight is 62 to 500 grams per mol, catalyst, antioxidant, ultraviolet absorbent and solvent. Through adjusting the polylol compound in the polyurethane resin, increasing usage of a polyether polylol compound, improving the hydrolysis resistance of the polyurethane resin, and adjusting variety and dosage of assistants such as antioxidant, ultraviolet absorbent and the like, the yellowing resistance of the synthetic leather prepared by the polyurethane resin can reach a level of more than grade 4.

A polyamide resin composition comprises (A) about 10 to about 70% by weight of a crystalline polyamide resin, (B) about 10 to about 70% by weight of an amorphous polyamide resin, (C) about 5 to about 30% by weight of an inorganic filler, and (D) about 10 to about 50% by weight of a white pigment. The polyamide resin composition can have good thin-wall moldability, light reflectance, yellowing resistance, impact strength and heat resistance.

The invention discloses a PC (Polycarbonate) material with an excellent transparent light diffusion function and a preparation method thereof. The PC material is composed of polycarbonate, flame retardant masterbatch, an auxiliary flame retardant, a compound light diffuser, an antioxidant, a flame retardant synergist, a lubricant and other auxiliaries. The principle ingredient of the PC material is PC resin; the PC material is extruded by two steps, wherein the first step is to blend a sulfonate type major flame retardant and an organic silicon flame retardant with the PC resin by melting and granulate the mixture through extrusion by virtue of a twin-screw extruder so as to obtain the light diffusible flame retardant masterbatch, and the second step is to add the compound light diffuser, the flame retardant masterbatch, the antioxidant, the flame retardant synergist, the lubricant and other auxiliaries for further melting blending by taking PC as the major ingredient, and then extrude and granulate the mixture. The flame-retardant light diffusible PC material provided by the invention can be widely applied to an LED (Light-Emitting Diode) lamp, the backlight of a liquid crystal display, a transmission type screen, a decorative lighting billboard, an advertisement lamp box and the like in the lighting field.

The invention discloses anti-seismic epoxy dipping glue and a preparation method thereof. To be specific, the dipping glue comprises a component A and a component B in a weight part ratio of 3 to 1; the component A comprises 50.0-75.0 parts of bisphenol A epoxy resin, 5.0-20.0 parts of epoxy acrylate, 10.0-20.0 parts of hydrogenated bisphenol A epoxy resin, 2.0-8.0 parts of diluents, 5.0-15.0 parts of toughening agents, 1.0-6.0 parts of a thixotropic agent, 0.1-0.5 parts of an anti-aging agent, 0.5-1.0 part of peroxides, and 0.1-1.0 part of rheological additives; the component B comprises 20.0-40.0 parts of an aliphatic amine curing agent, 40.0-60.0 parts of an alicyclic amine curing agent, 0.5-2.0 parts of accelerants, 1.0-4.0 parts of coupling agents and 1.0-15.0 parts of a thixotropic agent. The dipping glue is prepared by respectively preparing the component A and the component B, and mixing the components A and B, and is mainly used for gluing carbon fiber composite materials used for reinforcing buildings in areas with the seismic fortification intensity of not less than level 7; the intensity index of the dipping glue is in line with performance indexes in Engineering Structure Strengthening Material Security Identification Technical Specification of GB50728-2011.

The invention discloses an UVLED light-curing wood coating and application thereof, the coating comprises an oxetane compound, an epoxy compound selected from the group consisting of at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin or an alicyclic epoxy compound, a (methyl) acrylate compound, a cationic and a radical photoinitiator, and optionally a sensitizer. The coating has excellent response to an UVLED light source in the wavelength range of 200 to 450 nm, and the curing speed is fast. The cured coating is excellent in hardness, wear resistance, flexibility, adhesion, alcohol resistance and yellowing resistance and the like. The coating is odorless and has strong technical and market competitiveness.

The invention provides an anti-yellowing polyamide composition and a preparation method of anti-yellowing polyamide; the yellowing polyamide composition includes polyamide 56 and anti-aging agents, wherein the anti-aging agents include a heat stabilizer, a light stabilizer and an amino functional group end-capping agent. The preparation method of the anti-yellowing polyamide comprises that the components of the anti-yellowing polyamide composition are subjected to melt mixing, and thus the anti-yellowing polyamide is obtained. The anti-yellowing polyamide not only has durable anti-yellowing property, but also has excellent mechanical properties and processability.