4results about How to "Improve initial whiteness" patented technology

This invention relates to the field of polymer materials, specifically to an automotive interior material and its preparation method, comprising PVC resin and a composite heat stabilizer; the composite heat stabilizer comprises a calcium-zinc heat stabilizer, a polyol phosphate ester, and amino POSS, wherein the mass ratio of the PVC resin to the composite heat stabilizer is 20-40:1, and the mass ratio of the calcium-zinc heat stabilizer, the polyol phosphate ester, and the amino POSS is 1-5:1-5:1-5. The automotive interior material prepared by this invention has good thermal stability and mechanical properties, and excellent heat aging resistance.

The invention discloses a guanine PVC heat stabilizer and application thereof, and belongs to the technical field of heat stabilizers. The heat stabilizer is guanine or guanosine or a compound of a main stabilizer and an auxiliary stabilizer, the main stabilizer is guanine or guanosine, and the auxiliary stabilizer is at least one of a calcium salt stabilizer, a zinc salt stabilizer and a polyol stabilizer. The guanine heat stabilizer can improve the initial whiteness of PVC, endows the PVC with good long-term stability, can be used for preparing PVC composite materials, improves the heat stability and mechanical properties of the PVC composite materials, and meets the use requirements of the PVC composite materials in most scenes.

This invention discloses an adenine-based heat stabilizer and its application in PVC composites, belonging to the field of heat stabilizer technology. The heat stabilizer is an adenine-based substance or a compound of an adenine-based substance and an auxiliary stabilizer. The adenine-based substance is adenine or adenine nucleoside, and the auxiliary stabilizer is at least one of calcium salt stabilizers, zinc salt stabilizers, and polyol stabilizers. This adenine-based heat stabilizer can improve the initial whiteness of PVC and impart better long-term stability to PVC. Its application in PVC composites can effectively improve the thermal stability and mechanical properties of PVC composites, possessing practical application value.

The present application relates to the technical field of LED packaging material, and particularly relates to a white resin composition for LED packaging, a preparation method and application thereof. According to weight parts, the raw materials for preparing the resin composition include: 100 parts of epoxy resin, 0.1-5 parts of first antioxidant, 0.1-5 parts of second antioxidant, 120-170 parts of curing agent, 0.1-5 parts of catalyst, 600-1300 parts of inorganic filler, 150-600 parts of white pigment, 1-10 parts of release agent, and 0.1-2 parts of whitening agent; the first antioxidant includes hindered phenolic antioxidant; the second antioxidant includes phosphorus-hydrogen bond-containing phosphinate antioxidant; and the release agent includes polyether-modified dimethylsiloxane. The obtained composition has high reflectivity, heat discoloration resistance and good de-runner workability, and can meet the packaging requirements of LED support.