Rare earth composite stabilizing agent used for PVC and preparation method thereof

Abstract

The invention discloses a rare earth composite stabilizing agent used for PVC and a preparation method thereof. The composite stabilizing agent is compounded by a main stabilizing agent and an auxiliary stabilizing agent; the main stabilizing agent is a small molecular weight benzoic acid rare earth salt, and the auxiliary stabilizing agent is polyol and stearate; and the weight ratio of each component is as follows: 1-10 parts of the small molecular weight benzoic acid rare earth salt, 1-5 parts of the polyol, and 1-5 parts of the stearate. The problem of low initial anti-staining ability ofsingle rare earth heat stabilizer can be solved; excellent long-term stability of the rare earth heat stabilizer can be reserved; and a coordination compound of rare earth and a benzoic acid ligand has an ultraviolet absorption property. The stabilizing agent also has light stability, is low in toxicity and environmentally friendly, and accords with production requirements of current PVC industries.

Description

technical field [0001] The invention relates to a PVC stabilizer, in particular to a rare earth composite stabilizer for PVC and a preparation method thereof. Background technique [0002] Polyvinyl Chlorine (PVC) is widely used in chemical industry, materials, machinery, agriculture, daily necessities and other fields because of its superior physical properties and low cost, especially in the field of plastics, known as the five general-purpose plastics one. However, PVC has a very important defect, that is, it is easy to decompose and generate HCl gas during thermal processing, and self-catalysis leads to severe degradation of PVC, which affects various properties of PVC products, such as discoloring PVC products or reducing its mechanical properties. In order to overcome this defect of PVC, an appropriate amount of heat stabilizer is usually added during the thermal processing of PVC. At present, widely used PVC heat stabilizers include lead salt heat stabilizers, organ...

AI Technical Summary

Problems solved by technology

However, its light stability has not been proven, and when PVC materials are exposed to light for a long time, such stabilizers will not be competitive

[0004] At present, there is a lack of a rare earth composite stabilizer with both heat and light stability, which can achieve the effect of one agent with multiple uses, which not only greatly reduces the production cost, but also is easy to use

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