Organic acid and rare earth composite heat stabilizer for PVC (polyvinyl chloride)

Abstract

The invention discloses an organic acid and rare earth composite heat stabilizer for PVC (polyvinyl chloride). The composite heat stabilizer is prepared by chemically synthesizing a heat stabilizer, lanthanum carbonate, nitric acid, zinc stearate, cerium carbonate, a solvent, sodium hydroxide, a composite antioxidant, hexadecanol, glycerin and mineral oil. According to the composite heat stabilizer, synthesized lanthanum stearate is compounded with other heat stabilizers, so that the thermal degradation temperature of PVC can be increased, the thermal stabilization time of PVC can be prolonged, the balance torque of the PVC can be reduced, the PVC processing power can be effectively reduced, and a large amount of effective energy resources are saved.

Description

[0001] technical field [0002] The invention relates to the field of chemical industry, in particular to an organic acid rare earth composite heat stabilizer for PVC. Background technique [0003] Polyvinyl chloride has excellent corrosion resistance and high mechanical properties, and because of its low price, abundant raw materials, and mature manufacturing technology, its products are used in various fields of industrial and agricultural production. However, there is a fatal weakness in PVC processing , that is, poor thermal stability, therefore, a heat stabilizer must be added when processing PVC. [0004] There are hundreds of commercial heat stabilizers in the world, mainly including lead salt stabilizers, metal soap composite stabilizers, organotin stabilizers and rare earth stabilizers. At present, heat stabilizers are mainly divided into tin stabilizers, lead Stabilizers, mixed metal stabilizers, etc. Lead salt stabilizers are highly toxic, bioaccumulative, and e...

AI Technical Summary

Problems solved by technology

Lead salt stabilizers are highly toxic, bioaccumulative, and easy to produce dust; metal soap composite stabilizers contain heavy metals such as cadmium and barium, and cadmium and barium have strong toxicity. It has a serious impact on human health and the ecological environment; although organotin stabilizers have high performance and low pollution hazards, they are expensive and costly

Although the rare earth heat stabilizer stabilizer has a good stabilizing effect and has no toxic and side effects, it cannot achieve the desired stabilizing effect if it is used alone