8results about How to "Improve yellowing" patented technology

The invention belongs to the technical field of release film production and processing, and particularly discloses an anti-yellowing release film and a preparation method thereof, and the preparation method comprises the following steps: (1) coating a buffer layer on a base film to form a film A; and (2) coating the film A with silicon resin to form the yellowing-resistant release film. Wherein the silicon resin has a methyl structure, the silicon resin with the methyl structure has a release effect, and the silicon resin coating with a certain thickness has relatively high strength, so that small molecules or impurities in an epoxy resin mixture can be effectively prevented from entering and adhering to the silicon resin coating; the tough buffer coating acts as a buffer layer to prevent the silicon coating from cracking as the time of use extends. The anti-yellowing release film obtained by the method can effectively improve the yellowing phenomenon of a film coating after thermal injection molding or hot pressing on the premise of not changing the performance of the film coating, so that the requirement of a client for repeated use is met.

The invention relates to the technical field of ink-jet ink, and discloses low-refractive-index high-transparency UV ink-jet ink and a preparation method thereof.Fluorine-containing alkenyl zwitterionic monomers obtained through substitution, condensation, quaternization and other reactions are polymerized with UV curing resin prepolymer under the action of a photoinitiator, and pigment, auxiliaries and the like are added to prepare the ink-jet ink; the electronegativity of fluorine atoms is great, and the polarizability is small, so that the propagation speed of light in the ink is accelerated, and the refractive index is relatively low; the fluorine-containing alkenyl zwitterionic monomer can increase the compatibility between the pigment and a solvent, and can form a layer of protective film around pigment particles to prevent the pigment particles from getting close to each other and aggregating, so that the transmittance of the ink is further improved; the prepared UV ink-jet ink is excellent in tensile strength, water resistance, wear resistance, adhesiveness and weather resistance, meets the industrial requirements of ink, and is suitable for ink-jet printing in various fields.

The invention relates to the technical field of adhesives, in particular to a room temperature vulcanized silicone sealant for an anti-yellowing bulb lamp and a preparation method of the room temperature vulcanized silicone sealant. The silicone sealant is prepared from the following raw materials in parts by weight: 80 to 120 parts of polydimethylsiloxane; 1-5 parts of a catalyst; 100 to 130 parts of filling particles; 2-10 parts of a cross-linking agent; 5-20 parts of a lubricant; the catalyst is prepared from the following raw materials: zirconium n-propoxide, an acyl ester ligand and an alcohol solvent, the acyl ester ligand comprises at least one of ethyl acetoacetate, methyl pivaloyl acetate and ethyl trifluoroacetoacetate. According to the silicone sealant, the zirconium-based catalyst is self-made and added into the silicone sealant, so that the technical problems that the existing silicone sealant is easy to yellow and easy to corrode and crack when being applied to an LED lamp can be obviously improved; the obtained silicone sealant has good stability, yellowing resistance and corrosion resistance, and can meet the processing requirements of LED lamps (especially bulb lamps).

This utility model provides a display module and an electronic device. The display module includes a frame structure, a light guide plate disposed in the frame structure, a light source, and a flexible circuit board. The light source is disposed on one side wall of the flexible circuit board, the light guide plate is located on one side of the light source, and a gap is provided between the light guide plate and the light source. The flexible circuit board is located above the light guide plate, and a portion of the flexible circuit board and the end of the light guide plate facing the light source are staggered. A colored film layer is provided on the side wall of the flexible circuit board facing the light source. The colored film layer is used to mix the refracted light to form white light before it is emitted. This application can improve the problem of yellowing in the lamp opening area.

The invention provides a hard chlorinated polyvinyl chloride foam material and a preparation method thereof, and relates to the field of chlorinated polyvinyl chloride. The preparation method of the hard chlorinated polyvinyl chloride foaming material comprises the following steps: preparing a composite foaming system, performing segmented premixing, preparing a material blank, and performing foaming molding. According to the preparation method of the hard chlorinated polyvinyl chloride foam material, the material temperature in the foaming preparation process of the CPVC material can be effectively reduced, the problems of yellowing and embrittlement of the processed CPVC material can be avoided, the appearance of a CPVC foamed product can be improved, the situations of non-uniform bubble hole size, hole stringing and hole breaking caused by decomposition of CPVC are reduced, the impact resistance of the CPVC material is improved, and the service life of the CPVC material is prolonged. The rigidity of the CPVC material is improved, and the deformation problem of the CPVC material is improved.

The invention relates to an ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof, and belongs to the technical field of high-molecular compound compositions. The ABS composition disclosed by the invention is prepared from the following components in parts by weight: 53 to 73 parts of ABS resin, 15 to 30 parts of PETG copolyester, 11 to 13 parts of brominated flame retardant and 1 to 3 parts of antimony flame retardant, the weight percentage of butadiene in the ABS resin is greater than or equal to 20%, and the weight percentage of 1, 4-cyclohexanedimethanol in the PETG copolyester is 10-30%; the PETG copolyester adopts the ISO 1133-1: 20 11 standard, and the melt mass flow rate is greater than or equal to 18g / 10min under the conditions that the temperature is 220 DEG C and the weight is 10kg. The ABS composition not only has good flame retardant property, but also has excellent marking effect and mechanical property.

The utility model provides a reflection gap film. The gap film sequentially comprises a high cut-off EVA layer, a high reflection PET layer, a UV glue structure layer and a fluorine coating from bottom to top. According to the reflection gap film provided by the utility model, the UV glue structure layer and the high-reflection PET layer are arranged, so that incident sunlight at the gaps of the battery pieces can be utilized, and the photoelectric conversion efficiency can be improved; by arranging the high-cut-off EVA layer, ultraviolet band light can be absorbed, and the problem of yellowing of the photovoltaic module is solved; an aluminum-based structure is not included, so that light pollution can be reduced, and the problems of power attenuation, local short circuit and the like caused by contact between the aluminum-based structure and a battery piece can be avoided; compared with mirror reflection of an aluminum base layer structure, the reflection gap film belongs to diffuse reflection, the anti-dazzle capacity is better, and light pollution can be reduced.

The present invention provides a high temperature resistant oxidation color fixing agent, a preparation method and its application. A dimethyldiallylammonium chloride derivative, a pH buffer and a solvent are mixed to obtain the high temperature resistant oxidation color fixing agent; wherein the dimethyldiallylammonium chloride derivative is a polymer polymer formed by copolymerizing dimethyldiallylammonium chloride and cyclohex-4-ene-1,2-dicarboxylic acid diene to form a main chain and grafted with p-phenylene diisocyanate. The high temperature resistant oxidation curing agent provided in the present application can enhance the binding ability of the fiber and the color fixing agent, and improve the high temperature resistance of the color fixing agent, improve the color fixing effect at high temperature, and effectively improve the yellowing problem of nitrogen-containing polymer materials during high temperature heat treatment and storage and transportation. At the same time, the high temperature resistant oxidation color fixing agent provided in the present application can be applied to polymer fiber materials at different stages such as polymerization and post-treatment, with flexible processing methods, wide application fields, no need for complicated processing steps, and broad application prospects.