1342results about How to "Good yellowing resistance" patented technology

The invention relates to the electronic application-coating field, in particular to uv-curing coating with high wearing resistance and vacuum coating. The compositions and contents of the invention are: 10 wt percent to 30 wt percent of difunctional group polyurethane acrylate, 10 wt percent to 40 wt percent of high functional group polyurethane acrylate, 5 wt percent to 20 wt percent of high functional group acrylate monomer, 0 wt percent to 15 wt percent of monofunctional group acrylate monomer, 1 wt percent to 10 wt percent of acid adhesive promoter, 1 wt percent to 6 wt percent of photoinitiator, 0 wt percent to 5 wt percent of nano wearing resistance materials, 0.1 wt percent to 2 wt percent of additive and 10 wt percent to 50 wt percent of solvent. The invention is designed for providing surface protection for vacuum coating parts of electric products such as mobile phone, MP3, and digital camera, etc., and is characterized by good surface effect, good performances of ultrawear-resistance, high temperature and humidity resistance, anti-cold thermal cycling and anti-yellowing, etc., wherein, RCA wear can be up to more than 1500 times, which can effectively improve the service life of electric products. The invention effectively enhances the adhesion and wearing resistant performance of the uv-curing and vacuum coating dope, solves the matching problem of the bottom and surface lacquer of the uv-curing and vacuum coating dope, and has broad university.

The invention relates to an organic silicon encapsulating material for a high-power LED and a preparation method thereof. The organic silicon encapsulating material is prepared by mixing a component A containing vinyl polysiloxanes, a silicone resin component B, a component C containing hydrogen polysiloxane, a platinum catalyst component D, a component E of catalytic inhibitor of acetylene alcohols and a tackifier component F. The obtained encapsulating silicon rubber with different refractive indexes of level 1.4, level 1.5 and the like can be used for the encapsulation of various high-power LEDs and the encapsulation of other optical application. The organic silicon rubber encapsulating material for the high-power LED takes the silicone resin component B as a filling material, which not only enables that the silicone rubber has high transparency, high strength and high light transmittance, but also improves the temperature resistance, the yellowing resistance, and the durability of the high light transmittance of high-power LED products. The organic silicon rubber encapsulating material for the high-power LED can be prepared into two encapsulating forms of a single component and bi-component, which improves the adaptability and the encapsulating efficiency for encapsulating equipment and process procedures, and has the characteristics of reduced cost and convenient use.

The present invention relates to a high-fullness high-distinctness environment-protecting type polyurethane matte varnish. Said varnish consists of the paint component, polyurethane solidifying agent component and diluting agent component according to the ratio of 1:0.5:0.6-0.8. The polyurethane solidifying agent component contains 50-70 wt% of tolylene diisocyanate trimer, and the rest is the affixture of 80% of tolylene diisocyanate and 20% of trimethylol propane, the paint component contains 15-25% of short oil soya alkyd resin whose solid content is 80%, 50-60% of modified saturated polyester resin, 0-5% of castor oil, 10-12% of aldehyde ketone resin whose solid content is 60%, 3-5% of flatting silica, 0.3-1.0% of teflon wax and 4%-10% of conventional adjuvant and solvent, and the diluting agent component contains 70-80% of butyl acetate, 10-20% of mixed diacid dimethyl ester and 10-15% of isophorone.

The invention relates to a double-component epoxy resin adhesive for repairing stone surface and the preparation method thereof. The double epoxy resin adhesive is composed of a component A consisting of epoxy resin and diluting agent, and a component B consisting of curing agent, optical stabilizer and UV absorber. The double-component epoxy resin adhesive is used for repairing microcrack on stone surface and ant road, and has the advantages of moderate curing speed, good yellowing-resistant performance, good permeability, high glossiness after cured and polished, easily-obtained environment-friendly material, simple process, etc.

The invention discloses a preparation method of a high temperature and yellowing resistant alkali-soluble epoxy acrylate UV resin. The preparation method comprises the following steps: carrying out free radical polymerization on an alicyclic epoxy acrylate monomer, glycidyl methacrylate, and hydroxyethyl methacrylate or hydroxypropyl methacrylate to prepare an alicyclic epoxy acrylate copolymer; reacting acrylic acid with an epoxy group in the above epoxy acrylate resin, and introducing a double bond to make the resin have photosensitive activity; and reacting acid anhydride with a hydroxy group, and introducing a carboxyl group to make the resin alkali-soluble in order to prepare the high temperature and yellowing resistant alkali-soluble epoxy acrylate UV resin with a carboxyl group. The glass transition temperature of the resin finally obtained in the invention is 65-100DEG C, and the finally obtained resin has the characteristics of good high temperature resistance, yellowing resistance, acid and alkali resistance of a curable film, solvent resistance, excellent mechanical performances and the like, and can be widely applied in yellowing resistant optical imaging solder resistant inks, photoresist, yellowing resistant UV inks and coatings, adhesion promoters, ink crosslinking agents and the like.

The invention discloses coating for an automobile sealing strip and a preparation method thereof. The coating comprises a film forming material, at least one curing agent, a plurality of auxiliaries, at least one packing and solvent. The film forming material comprises organic silicon polymer emulsion, epoxy resin and polyurethane. The curing agent is closed isocyanate. The auxiliaries include a dispersing agent, a wetting agent, a thickening agent, an antifoaming agent and an ultraviolet absorber, and the solvent is water. The coating for the automobile sealing strip has excellent abrasion-resistance, yellow degeneration resistance at high temperature, flexibility, pollution resistance, environmental friendliness, and is convenient to transport and use and easy to store.

A molded article of an aromatic polyester block copolymer resin which is excellent in hydrolytic resistance, heat resistance, and yellowing resistance. The thermoplastic polyester resin composition comprises: 100 parts by weight of a polyester block copolymer (A) which is obtained by reacting a thermoplastic aromatic polyester with a lactone and has a terminal carboxy group content less than 5 mg-KOH / g; 0.05 to 5 parts by weight of a polycarbodiimide compound (B); 0.05 to 5 parts by weight of an epoxy compound (C) having a functionality of 2 or higher; 0.01 to 0.5 parts by weight of a phenolic antioxidant (D); and 0.01 to 0.5 parts by weight of a sulfur compound antioxidant (E).

The invention discloses a water-based transparent colored paint for wooden ware and a preparation method of the paint. The water-based transparent colored paint is applied to decoration of the surface of a wood material (cabinets, tables, chairs, chair rails and the like). The water-based transparent colored paint comprises components including water-based emulsion / dispersoid, a water-based color concentrate, pure water, a film forming aid, a wetting dispersant, a foam killer, a flatting agent, a bactericide, a mildew preventive, an anti-freezing agent, a thickening agent, a multi-functional additive, a matting agent and wax emulsion. The water-based transparent colored paint for the wooden ware is bright in color and clear in texture and has the effects of greatly reducing the content of VOC, guaranteeing the application performance of the product and realizing the environmental protection characteristics of the product.

The present invention relates to a polyurethane curing agent with low free isocyanate monomer and a preparation method thereof. The polyurethane curing agent comprises the raw materials in weight percentage as following: 80 - 88 parts of hexamethylene diisocyanate monomer; 12 - 20 parts of polyhydric alcohol; 0.1-0.5 part of catalyst; and 0.1-1.0 part of terminating agent. The invention adopts a two-step chemical conversion reaction, namely, adds one step of polymerization reaction based on one-step addition reaction to remove free isocyanate monomer by a trimer method so as to obtain the 100% solid content, wherein the NCO content is between 21 and 22 %, and the free HDI content is between 0.1 and 1.0 %. According to the present invention, the preparation process of polyurethane curing agent is simplified without post-processing . The polyurethane curing agent of the invention is matched with hydroxyl acrylic resin and polyester resin etc., and the paint film will not be yellowed, and has excellent light resistance, weathering resistance, chemical resistance and gorgeous gloss.

The invention discloses anti-after tack acrylic latex for water-based ink. The latex comprises 5-18% of water, 0.1-0.8% of initiator, 40-60% of self-made alkali-soluble resin solution, 4-20% of C4-C12 alkyl acrylate monomer, 15-40% of C4-C20 methacrylate monomer and 0.2-5% of functional monomer. In a preparation method of the latex, firstly (methyl) acrylic acid, methyl methacrylate and C4-C12 alkyl acrylate are used as comonomers, persulfate is used as the initiator, a chain transfer agent is adopted, and then the alkali-soluble resin solution is obtained through emulsion polymerization; and then, the C4-C12 alkyl acrylate unsaturated monomer, the C4-C20 methacrylate unsaturated monomer and the functional monomer are used as comonomers, the alkali-soluble resin serves as a protective colloid, and then the anti-after tack acrylic latex is prepared by soap-free emulsion polymerization. According to the invention, the technology is simple, the operation is convenient, and the energy consumption and cost of production are reduced; and the latex has excellent yellowing resistance and color paste stability, and can effectively improve the alcohol resistance, soaping resistance, color development property and anti-after tack property of the water-based ink.

The invention relates to benzene-free and ketone-free composite plastic ink which comprises 25-35 parts of modified polyurethane resin, 5-10 parts of matching resin (polyketone resin), 0.5-1 part of dispersant, 7-15 parts of pigment, 2-4 parts of adhesion promoter, 0.1-0.3 part of wax powder, 10-15 parts of ethanol, 20-30 parts of acetic ether and 10-20 parts of isopropyl alcohol, wherein the matching resin is L-872 polyketone resin, the contents of the ethanol, the isopropyl alcohol and the acetic ether are all above 99%, the content of benzene and ketone substances is below 0.01%, the dispersant is TM-950, the adhesion promoter is a titanate coupling agent HY-201, and the wax powder is polyethylene wax. The benzene-free and ketone-free composite plastic ink takes the isopropyl alcohol, the acetic ether and the ethanol as diluents without the assistance of the benzene and ketone substances for dissolving. The benzene-free and ketone-free composite plastic ink has no harm to operators, society and environment from preparation and production to printing and use and has excellent safe and healthy property.

The invention relates to a polyurethane retanning filler. The preparation method of the polyurethane retanning filler comprises the following steps: preparing a prepolymer from raw materials IPDI (isophorone diisocyanate), PEG (polyethylene glycol), castor oil and DMBA (dimethylbenzanthracene); adding triethylamine to carry out neutralization reaction to generate salt; and adding an ethylenediamine water solution to carry out emulsification and chain extension to prepare the water-based polyurethane emulsion. The coated film of the water-based polyurethane emulsion has favorable water resistance and yellowing resistance.

The invention discloses a preparation method of a polyurethane trimer curing agent of a low free isocyanate monomer, comprising the following steps of: under the protection of nitrogen, firstly putting an isocyanate monomer and an esters solvent into a reaction container to evenly stir, wherein the temperature is kept at 50-90DEG C; dropwise adding diamine into the reaction container under the condition of stirring, wherein the dropwise adding time is 1-1.5 hours; and after dropwise adding, adding a catalyst of which the mass is 0.1-0.5% of that of the isocyanate monomer once, continuing stirring and reacting at the temperature of 70-100DEG C for 3-6hours, when the NCO base content is 20%-25%, immediately adding the polymerization inhibitor of which the mass is 0.1-1% of that of the isocyanate monomer, keeping the temperature for 1-2hours, and discharging in a cooling way. The polyurethane trimer curing agent prepared by the preparation method can be better compatible with the resin, can be quickly solidified under normal temperature, and has the advantages of being higher in mechanical strength, modulus, adhesion, etc.

The invention provides an emulsion pressure sensitive adhesive for an anti-yellowing surface protective film. The emulsion pressure sensitive adhesive is prepared by polymerization of various raw material components in a reaction still in percentage by weight: 40.5-45.5 percent of a soft monomer, 1.3-4.3 percent of a hard monomer, 1.7-3.3 percent of a functional monomer, 0.8-2.2 percent of an emulsifier, 0.2-0.5 percent of an initiator, 0.1-0.2 percent of a buffering agent, 0.4-1.3 percent of neutralizer, 0.05-0.2 percent of oxidizing agent, 0.05-0.2 percent of a reducing agent and 47.5-52.5 percent of deionized water. The protective film prepared by the invention is excellent in anti-yellowing property and favorable in adhesion property with color plates and aluminium plates, is free from phenomena such as degumming and adhesive residue after being stripped, has no pollution on substrates and meets the use performance requirements of the protective film.