130results about How to "Low yellow index" patented technology

The invention relates to a solar cell packaging EVA adhesive film capable of resisting heat, humidity, ultraviolet light and aging, which comprises the following materials by weight portions: 100 portions of copolymer of ethylene vinyl acetate, 0.8-1.4 portions of crosslink curing agent, 0.05-0.15 portion of crosslink curing accelerator, 0.2-0.6 portion of tackifier, 0.1-0.5 portion of antioxidant, 0.05-0.25 portion of ultraviolet light stabilizer and 0.1-0.3 portion of ultraviolet light absorbent, wherein the crosslink curing agent is tert butyl peroxy 2-ethyl hexyl carbonate; the crosslink curing accelerator is triallyl isocyanurate; the tackifier is r-glycidyl ether oxy-propylltrimethoxysilane; the antioxidant is one or two selected from the group consisting of bis(2,4-dicumylphenyl)pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, tris(nonyl phenyl)phosphate and tris(2,4-butylphenyl)phosphate; and ultraviolet light absorbent is gas phase silicon dioxide. The solar cell packaging EVA adhesive film can resist high temperature of 85 DEG C, humidity of 85 percent, ultraviolet light and thermal oxidative aging.

The invention belongs to the technical field of adhesives, and particularly relates to an ultraviolet-heat dual curing optical adhesive containing epoxidized polybutadiene resin. The ultraviolet-heat dual curing optical adhesive comprises the following components in percentage by weight: 14.5%-45% of epoxidized polybutadiene resin, 10%-40% of alicyclic epoxy modified resin, 5%-15% of polyolefin liquid rubber, 25.5%-35% of an acrylic ester reactive diluent, 2.4%-3.4% of a free radical photoinitiator, 0.1%-0.2% of a cationic photoinitiator and 2%-2.5% of a peroxide initiating curing agent. The optical adhesive disclosed by the invention is relatively completely solidified at a shaded part, a dark adhesive layer part or a thick adhesive layer part, has excellent optical properties such as high refractive index and high transmittance after being solidified, has the advantages of shock resistance, low yellowing coefficient, low haze, low shrinking percentage, easiness in repairing and good flexibility, meets the requirements of optical, physical and chemical properties of display devices, and is suitable for fast-tempo and high-efficiency production processes.

The invention relates to an anti-yellowing cationic water-based polyurethane leather finishing agent, and belongs to the technical field of textile chemicals. The anti-yellowing cationic water-based polyurethane leather finishing agent is prepared by using polyalcohol, aliphatic diisocyanate, diethanol amine and a cross-linking agent as raw materials to synthesize cationic water-based polyurethane, and adding an antioxidant and an uvioresistant absorbent for modifying the cationic water-based polyurethane. The prepared cationic water-based polyurethane finishing agent has the advantages of high stability, yellowing resistance and the like.

The invention relates to a composition with the capability of providing the thermal stability for polymer and application of the composition. The composition is prepared from the following raw materials: (1) hindered phenol, (2) phosphate or thioester, (3) an acid-removing agent and (4) sulfite, bisulfate or sulfide, wherein the mass ratio of hindered phenol, phosphate or thioester, the acid-removing agent and sulfite, bisulfate or sulfide is 1:(1-4):(0.5-2):(0.5-3). The invention also provides the application of the composition serving as an antioxidant in polymer resin. The composition is capable of lowering the melt index of polyolefin, eliminating a quinones compound serving as an intermediate and lowering the yellow index of polyolefin.

The invention provides an aerogel catalyst. The aerogel catalyst is aerogel particles containing TiO2 and SiO2. The particle diameter of each aerogel particle is 10-200 nanometers, and the density of the aerogel particles is 30-600 mg/cm<3>. The invention also provides a preparation method of the aerogel catalyst. Biodegradable copolyester prepared by using the aerogel catalyst provided by the invention has higher polymerization degree, the distribution of molecular weights is more centralized, and the defect of yellow color of the biodegradable copolyester is relieved.

The invention provides a preparation method of a polyester amide. According to the method, by optimizing the pre-polymerization and polycondensation reaction conditions, the yellowing of the polyesteramide in the polymerization process is effectively reduced, and the yellow index of the prepared polyester amide is low, so that the polyester amide is suitable for industrialized production and haswide application prospect.

The invention relates to a method for modifying waterborne wood coating, in particular to a method for chemically modifying the waterborne wood coating by using nano-cellulose dispersed graphene, aiming at solving the problem that the existing waterborne wood coating modified by using nanometer materials is poor in nano particle dispersity, so that the waterborne paint film is poor in mechanical properties. The method comprises the following steps: 1, preparing a hemicellulose-containing nanocellulose aqueous solution enabling cellulose raw materials to be sequentially subjected to extractiontreatment and delignification treatment to obtain holocellulose; then, carrying out mechanical pretreatment or chemical and mechanical mixed pretreatment to obtain a hemicellulose-containing nanocellulose aqueous solution; 2, stably dispersing graphene by using nano-cellulose; 3, carrying out in-situ chemical modification on the waterborne wood coating by using the nano-cellulose dispersed graphene. The method can remarkably improve the mechanical properties, such as adhesion, wear resistance, hardness and impact resistance, of the waterborne wood coating, and even endows the paint film with certain functionality such as electrical conductivity, thermal conductivity, ultraviolet resistance and aging resistance. The method provided by the invention is used for the field of waterborne wood coatings.

The present invention relates to a polarized light board structure which is provided with a polarized light layer, a first optical film and a second optical film, the first optical film is formed above the polarized light layer and the second optical film is formed below the polarized light layer, wherein, at least one optical film selected from the first optical film and the second optical film is polymethyl methacrylate optical film. Into the bargain, the optical film is formed by pasting the mixed solution to the polarized light board and doing heat treatment when penetrating the mixed solution and distributing on the substrate to prepare for making have finished, or the optical film is formed by penetrating the mixed solution and distributing on the substrate and doing thermal treatment.

The invention discloses a novel EVA (Ethylene-Vinyl Acetate) glue film for a solar battery; the EVA glue film has excellent characteristics of ultraviolet adsorption and anti-ultraviolet aging; when the EVA glue film is applied to a solar component, a solar backplane is protected from being damaged by ultraviolet lights, and the service life of the backplane material of the component with the EVA glue film is greatly prolonged. The EVA in the EVA glue film mainly comprises the following components: 90-100 parts of ethylene-vinyl acetate, 0.05-5 parts of superoxide crosslinking agent, 5-10 parts of lipid antioxidant, 5-10 parts of hindered amine light stablizer and 0.005-5 parts of thickening agent. The EVA glue film has strong intense light energy to absorb ultraviolet by adding a novel ultraviolet light absorbing agent 2-(2'-hydroxy-3', 5'- di-tert-butyl phenol) and greatly prolongs the service life of packaging material.

The invention relates to a production method of high-nitrile SAN resin. The method comprises the specific steps of (a) mixing acrylonitrile with part of styrene cinnamene to obtain a mixture A, then mixing the mixture A with a circulating material and a condensation circulating material outside a reactor in a static mixer through a metering pump so as to obtain a mixture B, and then continuously leading the mixture B to the reactor; and enabling the rest of the styrene to be pumped into a steam condenser at the top of a reaction kettle through the metering pump, to be in contact with steaming air flows of the reactor, and to be mixed with condensation steam to become a condensation circulating material, and enabling the condensation circulating material to enter the reactor through a static mixer ; (c) polymerizing a reaction mixture at 140-160 DEG C in the reactor for 1.5-2.5 hours so as to obtain an SAN copolymer; and (d) performing two-stage devolatilization in a devolatilization machine, and performing pelleting in a pelletizer, so as to obtain the high-nitrile SAN resin with narrow distribution. According to the high-nitrile SAN resin produced by the method disclosed by the invention, the percentage by mass of acrylonitrile is greater than or equal to 32%, the melt indexes of products are smaller than 6g/10min(230 DEG C, 2.16Kg), and the yellow index of the products is smaller than 12.

The invention provides an aerogel catalyst which is aerogel particle containing TIO2 and ZrO2, the particle diameter of the aerogel particle is 10-200mn, and the density is 30-600mg/cm<3>. The invention also provides a preparation method of the aerogel particle. Biodegradable copolyester prepared from the aerogel catalyst provided by the invention has high degree of polymerization and more intensive molecular weight distribution, and the detect that the color of the biodegradable copolyester is yellow color is alleviated.

The invention discloses a high-density polyethylene compound additive and a preparation method thereof, and belongs to the field of chemical engineering. The compound additive comprises an antioxidant, a nucleating agent, an acid acceptor and an antistatic agent, wherein the antioxidant comprises an antioxidant 330, an antioxidant 168 and an antioxidant 1076. The preparation method of the compound additive comprises the following steps: mixing the raw components, and uniformly stirring; granulating the uniformly mixed components so as to obtain granules; and sieving the obtained granules. The compound additive has the advantages that the 5000S-oxidation induction time can be prolonged to above 50 minutes through the synergistic effect among the additives, the yellow index is reduced, the fracture strain is improved, and the like.

The invention relates to a preparation method of a resin special for plastic suction molding of transparent broad molecular weight-distributed random copolymer polypropylene. The preparation method comprises the following steps: adopting a broad molecular weight-distributed catalyst NDQ on a Spheripol process single-loop polypropylene device, and adding ethylene to produce a base resin of broad molecular weight-distributed random copolymer polypropylene; adding auxiliary additives into the base resin of broad molecular weight-distributed random copolymer polypropylene; placing in a high-speed mixer to be extruded by a twin-screw extruder; and producing the resin special for plastic suction molding of transparent broad molecular weight-distributed random copolymer polypropylene. The special resin has molecular weight distribution Mw/Mn of 4-7, a melt index of 1.0-3.0 g/10 min, a yellowness index being less than or equal to 4, and a haze being less than or equal to 10%. The preparation method provided by the invention realizes industrial production in the Spheripol process single-loop polypropylene device, has characteristics of controllable polymer molecular weight distribution, low yellowness index and excellent transparency, and is particularly suitable for application of plastic suction molding.

The invention provides a preparation method of a polyester amide hot melt adhesive. Through optimization of a technical process and regulation and control of reaction parameters such as polymerizationtemperature, pressure, proportioning of reaction raw materials, and the like, the prepared polyester amide hot melt adhesive is low in yellow index, relatively high in peel strength, low in peel strength loss rate after water washing, excellent in performance and wide in application range.

The invention discloses a preparation method of yellowing-resistant ABS (acrylonitrile butadiene styrene) resin, and belongs to the technical field of synthetic resin and plastic. The invention specifically relates to a preparation method of ABS (acrylonitrile butadiene styrene) resin with high whiteness and low yellow index. According to the invention, the ABS resin with the whiteness value greater than 66, the yellow index lower than 19 and the excellent mechanical property can be prepared. According to the invention, the technical problem is solved, and the preparation method is provided inthe synthesis process of an ABS (acrylonitrile butadiene styrene) graft emulsion, and a functional monomer with an epoxy group is introduced into the shell layer of the ABS grafted powder, by utilizing an epoxy group and a cyano group, so that the cyclization reaction between the acrylonitrile groups in the ABS resin in the heating process is relieved, so that the apparent performance of the ABSresin can be improved, for example, the whiteness can be improved, and the yellow index and the like can be reduced. The ABS resin prepared by the method can be preferentially used in a household appliance shell, automobile apparent parts and the like, and has a wide market prospect.

The invention provides a preparation method of a styrene-acrylonitrile copolymer, which comprises the following steps: mixing a styrene monomer and an acrylonitrile monomer, cooling, feeding an obtained mixture into a first reactor, reacting while keeping a full state, controlling the temperature, feeding an obtained product into a second reactor, continuously reacting while keeping the full state, and finally devolatilizing. The invention also provides the styrene-acrylonitrile copolymer prepared by the preparation method provided by the invention. According to the preparation method providedby the invention, heat insulation or nearly heat insulation can be achieved in the whole polymerization reaction process; the stability of the polymerization reaction temperature can be effectively controlled without external heat transfer so as to ensure the stability of the composition of the obtained copolymer, the prepared copolymer has excellent optical performance, and the preparation method has characteristics of simple process, easy control and no requirement of complex equipment, such that the method is suitable for large-scale industrial production.

The invention discloses an EMMA optical film for full fitting of an electronic screen and a preparation method thereof. The EMMA optical film for full fitting of the electronic screen is prepared by pre-mixing 100 parts by weight of an ethylene-methyl methacrylate copolymer (EMMA), 0.5-2.0 parts by weight of a photoinitiator, 0.3-1.5 parts by weight of a crosslinking agent, 0.3-1.2 parts by weightof a tackifier, 0.1-0.6 part by weight of an optical stabilizer, 0.1-1.1 parts by weight of a plasticizer and 0.2-1.0 part by weight of an antioxidant by a stirrer, putting the mixture into a single-screw tape-casting machine and tape-casting into the optical film according to set process parameters. The prepared EMMA optical film has the advantages of excellent bonding properties, high light transmittance, low water vapor transmittance and high weather resistance, also is in thermal plasticity before curing, easily fills segment gaps, adapts to the complex interface fitting, and can adapt torequirements of fitting of electronic screen protection layers, touch control layers and display layers with different sizes.

The invention relates to a glass fiber-reinforced acrylonitrile butadiene styrene (ABS) material. The glass fiber-reinforced ABS material is characterized by comprising the following components in part by weight: 100 parts of ABS material, 20 to 40 parts of polyvinyl chloride (PVC), 15 to 35 parts of filling agent, 1 to 10 parts of talcpowder, 1 to 4 parts of antioxidant, 5 to 20 parts of silane coupling agent, 1 to 20 parts of organic silicon rubber/metallic soap, 1 to 10 parts of zinc stearate, 1 to 10 parts of stearic acid, 1 to 10 parts of chitosan and 10 to 40 parts of glass fiber. The ABS material has high heat resistance, toughness and strength, does not crack in the using process, and can be applied to parts such as automobile parts, fan blades and the like.

The invention provides a post-treatment method of a multi-sulfhydryl compound crude product. The method comprises the following steps: A) the multi-sulfhydryl compound crude product with the structure shown in formula (I) is washed with water and then mixed with a reducing agent for vacuum dehydration, wherein the reducing agent is selected from one or more of sodium sulfite, sodium bisulfite, sodium hydrosulfite and sodium thiosulfate; B) the product obtained in step A) is mixed with an adsorbent and filtered, and a purified polythiol compound is obtained; the adsorbent is selected from one or more attapulgite, bentonite, diatomaceous earth and activated carbon.

The invention discloses a preparation method of a UV (ultraviolet) moisture dual-curable modified organic silicone polymer. The preparation method includes the steps: performing condensation reactionon silanol-terminated polydimethylsiloxane and R1 substituted amino propyl trimethoxy silane under catalysis of bismuth octoate in vacuum at room temperature; adding a certain stoichiometric amount ofmethacrylic acid 2-isocyanato ethyl ester; performing stirring under the condition of nitrogen filling. The preparation method overcomes the shortcoming of high curing energy of current existing products and solves the problem that a traditional UV glue shaded area cannot be cured due to absence of illumination. Cured volume shrinkage is smaller than 0.5%, the problem of cracking of pulled thin plastic films due to over-high shrinkage is avoided, the polymer has performance indexes including yellowing index smaller than 0.5, bonding strength higher than 2MPa and refractive index of 1.49-1.51,a glue film is soft, elastic and low in hardness of Shore A15-20, shrinkage glue fault is not easily caused, and reliability is high.

The invention discloses a color modified flame retardant PET (polyethylene terephthalate) and PC (polycarbonate) composite material and a preparation method thereof. The color modified flame retardant PET and PC composite material is prepared from the following raw materials in parts by weight: 45 to 70 parts of PC, 30 to 45 parts of PET, 5 to 15 parts of hollow glass microspheres, 0.5 to 1.0 part of flame retardants, 3 to 15 parts of toughening compatilizers, 0.5 to 1 part of antioxidizers, 0.2 to 1 part of lubricating agents and 0.1 to 0.2 part of coloring agents, wherein the color agents are one or several of anthraquinone organic transparent dyestuff and anthraquinone type organic transparent purple dyestuff. The good flame retardant effect is achieved; meanwhile, good color and transparency are realized.