Benzoic acid rare earth salt composite stabilizer for PVC and preparation method thereof

Abstract

The invention discloses a benzoic acid rare earth salt composite stabilizer for PVC and a preparation method thereof. The composite stabilizer is formed by compounding a main stabilizer and an auxiliary stabilizer. The main stabilizer is small-molecular-weight benzoic acid rare earth salt, and the auxiliary stabilizer comprises polyols and stearates. The composite stabilizer comprises the components in parts by weight: 1-8 parts of the small-molecular-weight benzoic acid rare earth salt, 1-4 parts of the polyols and 1-4 parts of the stearates. The problem of low initial anti-coloring ability of a single rare earth thermal stabilizer is solved, meanwhile, the excellent long-term stability of the rare earth thermal stabilizer is retained, and the complex of rare earth and a benzoic acid ligand has ultraviolet absorption performance, and the stabilizer also has light stability. The composite stabilizer has low toxicity and environmental protection, and meets the production requirements ofPVC industry at present.

Description

technical field [0001] The invention relates to a PVC stabilizer, in particular to a benzoic acid rare earth salt composite stabilizer for PVC and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins in the world. Its products have the advantages of easy control of hardness, high mechanical properties, corrosion resistance, good electrical insulation, high transparency, and low price. They are widely used in industry and agriculture. and other production areas. The world's annual sales rank second only to PE among thermoplastics. However, the stability of PVC is poor, and it is prone to degradation reactions under external factors such as light and heat. When heated to 110°C, HCl will be released, and the released HCl will accelerate the decomposition of PVC, seriously affecting the performance of PVC resin. The processing temperature of PVC is generally above 160°C, so a stabilizer must be added in...

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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