稳定剂（stabilizer）.docVIP

稳定剂（stabilizer） PVC main stabilizers are compounds that have a stabilizing effect when used alone, whereas the stabilizers are compounds that work alone when used in combination with the host stabilizer. The synergy between certain main stabilizers or between some primary and secondary stabilizers will be synergistic. (I) base salt of lead; Base lead salt is one of the earliest and most widely used heat stabilizers for polyvinyl chloride. It is alkaline and can react with the reaction of HCL. Lead salts are not ideal in terms of toxicity, contamination resistance and product transparency. But its stability is good, the price is low, so it is still widely used in cheap PVC extrusion and rolling products. Because of its excellent electrical properties and low water absorption properties, it is widely used as a stabilizer for PVC electrical insulating products, compact discs and foam plastics. 1, three base sulfate (also known as three basic lead sulfate) White powder, specific gravity 7.10, sweet, poisonous, easy to absorb moisture, no flammability and corrosiveness. Insoluble in water but soluble in hot amines. It is discolored and discolored when exposed to moisture. Refractive index 2.1, often used as a stabilizer for electrical insulation products 2 and two base lead phosphite This is a fine needle crystal powder; the proportion of 6.1, is toxic; 200 degrees turn into dark gray, 450 DEG turn yellow. This product is not soluble in water and organic solvents, soluble in hydrochloric acid. Refractive index 2.25, with antioxidant effect, is a good climate resistance stabilizer. (two) metallic soaps Metal soaps are also a widely used PVC heat stabilizer. Use of a simple substance or mixture of carboxylic acids, barium, cadmium, zinc, and calcium carboxylates. The stabilizing effect is that it can act as esterification in the place where the poly (vinyl chloride) molecule breaks down. The strength of the stabilizing action is related to the metal ratio in the metal soap