33results about How to "Not yellowing" patented technology

Provided is a one-pack type water-based adhesive composition which suffers no yellowing and is excellent in terms of adhesiveness and durability. The one-pack type water-based adhesive composition comprises (A) an aqueous dispersion of a polyurethane resin and (B) a silane compound obtained by reacting a specific epoxysilane compound with an aminosilane compound represented by the following formula (2), the amount of the epoxysilane compound being in the range of 1.5-10 mol per mol of the aminosilane compound, at a reaction temperature of 40-100oC. (In formula (2), R7 to R12 are each a hydrogen atom or an alkyl group, R13 is a monovalent hydrocarbon group, R14 is an alkyl group, and b is 0 or 1.)

The invention discloses a high-lumen maintenance organosilicon material for LED packaging. The organosilicon material comprises a silicone component A, a silicone component B, nanometer magnesium oxide, a phosphor and an acrylic polymer, wherein the silicone component A comprises 60-85 parts of vinyl-terminated polymethylphenylsiloxane, 5-15 parts of vinyl-terminated polydimethylsiloxane, 3-8 parts of an active organic borosilicate tackifier, 10-25 parts of vinyl-terminated hyperbranched silicone resin and 0.05-0.5 part of a platinum catalyst; the silicone component B comprises 35-45 parts ofvinyl-terminated polymethylphenylvinylsiloxane, 45-55 parts of polymethylhydrosiloxane, 5-15 parts of MQ resin and 3-8 parts of a silane coupling agent A-172; and a mass part ratio of the silicone component A to the silicone component B to the nanometer magnesium oxide to the phosphor to the acrylic polymer in the organosilicon material is 100:100:(2.5-18):(3-8):(1-3). The organosilicon material has advantages of resistance to environmental hot and cold alternation, non-yellowing and high luminous flux.

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 polyesteror 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 relates to the technical field of materials for synthetic leather, in particular to an aliphatic polyurethane resin preparation method. The method includes the steps: 1) increasing the temperature of 35 parts of poly adipic acid glycol-butanediol ether glycol and 35 parts of polycaprolactone glycol to 100 DEG C, performing vacuum dehydration for about 1h and cooling to 50 DEG C, wherein the molecular weight of the poly adipic acid glycol-butanediol ether glycol is 3000, and the molecular weight of the polycaprolactone glycol is 1000; 2) adding 150 parts of methylbenzene, 83 parts of IPDI (isophorone diisocyanate), 19 parts of H12MDI (dicyclohexylmethane 4,4- diisocyanate) and 0.2 part of stannous octoate into a reactor with stirring uniformly, increasing the temperature to 90 DEG C and reacting for 3h; 3) adding 5 parts of 1,4-butanediol and 9 parts of neopentyl glycol to continue reaction for 3h at the temperature of 90 DEG C; 4) cooling to 50 DEG C, adding 250 parts of methylbenzene, 200 parts of isobutyl alcohol and 200 parts of ethyl acetate with stirring uniformly, slowly tackifying with 13.8 parts of IPDA (isophorone diamine), and stopping adding the isophorone diamine when the viscosity is increased to 3000cps; and 5) continuing to stir for 30 minutes and cooling to 30 DEG C to discharge, so that weak-solvent aliphatic polyurethane resin with 20% of solid content and 180kgf / cm<2> of modulus is obtained.

The invention discloses a machining method for a crystal decorating plate, and belongs to the technical field of crystal decorating plates. The machining method comprises the following steps of material selection, cutting, color wiping, primer spraying, padding, pattern designing, grooving and perforation, blank repairing, padding, crystal preparation, crystal layout, mirror plate perforation, adhesion, baking, embedding, air-drying, mounting, edging, packaging, standing drying and spray-coating. In the steps, parameters and conditions of each step are controlled. The method has the beneficial effects that the whole process is easy to operate and suitable for industrial production, and the production efficiency is improved by over 50 percent; moreover, in the whole production process, a plate and crystals are prevented from being bruised, and the yield is increased by 95 percent compared with that of a conventional machining method; the crystals are packaged by virtue of an acrylic plate, so that the crystals on a substrate are prevented from daily pollution, and meanwhile, the flashing effect of the crystals is fully presented; the acrylic plate can be periodically polished, so that longer service life is achieved.

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 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 provides an ethylene vinyl acetate (EVA) adhesive film used for solar battery packaging. The adhesive film comprises the following components in part by mass: 100 parts of ethylene vinyl acetate, 0.01-4 parts of organic peroxides, 0.01-3 parts of cross-linking aid, 0.01-3 parts of silane coupling agent, 0.1-1 part of light stabilizing agent, 0-1 part of ultraviolet light absorbing agent and 0.0001-0.01 part of fluorescent whitening agent. The invention also provides a solar battery assembly which comprises the ethylene vinyl acetate adhesive film. The EVA adhesive film is not easy to produce air bubbles when the solar battery assembly is laminated. Both the EVA adhesive film and the solar battery assembly have excellent heat and humidity resistance, ageing resistance and ultraviolet aging resistance.

A white alkali-dissolvable photosensitive composition is disclosed. The composition includes, by weight, 100 parts of alkali-dissolvable photosensitive resin, 5-30 parts of thermoplastic solid acrylic resin, 3-20 parts of an antioxidant, 30-90 parts of a photopolymerizable monomer, 5-30 parts of a photoinitiator, 100-200 parts of titanium dioxide, 30-90 parts of epoxy resin, 0.05-0.5 part of an amine catalyst and 30-90 parts of a diluent. A cured film formed from the composition has advantages of no contraction or crack after thermal shock, and no yellowing at high temperature, and can be used for preparing a printed circuit board.

The invention discloses a snowflake white inorganic artificial stone raw material formula and a production method, which belong to the field of decorative materials. The raw material formula consists of 22-27% of white cement, 7-11% of heavy calcium powder, 55-65% of quartz sand, and 3-3% of water. 8% and styrene-acrylic emulsion 2‑5%. The present invention uses inorganic materials such as cement to make snowflake white marble, prepares two kinds of mortar, and controls the consistency of the mortar to be 40-60mm for the white base material and 65-80mm for the gray grain material, and then add pigments and fabricate twice to complete the production , so that the surface texture of the board is similar to that of natural snowflake white marble; other properties of the board: bending strength > 18MPa, compression strength > 120MPa, water absorption < 0.5%.

The invention relates to a cast iron enamel burner and a preparation process thereof. According to the high-temperature resistant cast iron burner of an enameled household stove and the preparation process thereof provided by the invention, enamel coating layers are sprayed in the cavities and on the outer surfaces of parts of the burner such as a fire cover, a burning tray, an ejector and the like according to the use requirements and the type of the burner respectively, and the coating layers have oxidation resistance and enhance the acid and alkali resistance, ageing resistance and rust resistance of the outer surfaces of the parts. When the enamel burner is used in a working environment of far higher than 600 DEG C, even burnt in open fire, the enamel burner does not become yellow or explode enamel. The enamel burner has the characteristics of resisting acid and alkali, thermal shock, high temperature and impact, containing no harmful elements to the human body and the like.

The invention discloses solvent-based light oil suitable for an offset press. The solvent-based light oil comprises the components by weight percent of: 13-18% of primary connecting material resin, 6-10% of auxiliary resin, 65-80% of a solvent, 4-6% of an auxiliary solvent and 0.5-1% of an auxiliary agent. The Lower glass transition temperature can be obtained after the solvent-based light oil is dried compared with that by using UV (ultraviolet) light oil in the prior art; the solvent-based light oil is stable in the aspect of hot stamping adaptability; the problem of incomplete hot stamping is not generated; the matching characteristic of the solvent-based light oil with silk printing ink after the solvent-based light oil is applied to the offset press can be improved, and the deinking possibility is reduced due to the fact that the resin with low UV tension is selected by the solvent-based light oil.