Rare earth complex heat stabilizer for PVC and method for preparing same

Abstract

The invention provides a PVC rare-earth composite heat stabilizer and a method for making the same. The heat stabilizer is a wool acid metal rare-earth soap stabilizer and has a general chemical equation of xRE.yCa.zZn.(OOCR)n or x'RE.y'Ba.z'Zn.(OOCR)n. The method for making the heat stabilizer comprises the following steps that: sodium hydroxide is dissolved into an ethanol water solution and is stirred as well as is condensed and flowed back, the melting common and braid wool acid is added to adjust the pH value and decrease the temperature; water, chlorination rare-earth salt solution and salt are added in sequence to be pumped, filtered, washed by ethanol and water, dried and grinded into a product. The stabilizer adopts the common and braid wool acid as the raw material, thereby having wide resources, low cost, reasonable and scientific preparation method and great maneuverability; the product is straw yellow powder and has good primary and long-term heat stabilization performance of PVC and good effects in the aspects of material process and mechanical performance, is nontoxic and protects the environment, and can be applied to the processing and forming aspects of PVC water supply and drainage pipes and have evident social and economical benefits.

Description

technical field [0001] The invention belongs to the field of heat stabilizer manufacturing for PVC, and more specifically relates to a rare earth composite heat stabilizer for PVC and a preparation method thereof. Background technique [0002] my country is a big country of rare earths. At present, the rare earth heat stabilizers that have variable price elements, metal-like soaps and rare earth complexation in the stabilization of PVC have increasingly become the focus of attention. Most of them are stabilizers of rare earth organic weak salts. Mainly, their long-term thermal stability to PVC is better than that of lead salts and other metal soaps, and has good long-term thermal stability, and has a wide range of synergistic effects with other types of stabilizers, and has good tolerance , not polluted by S, stable storage, low toxicity and environmental protection, good lubricating performance, but also has the functions of coupling, volume expansion, toughening, improving m...

AI Technical Summary

Problems solved by technology

However, organic weak salts such as rare earth stearate developed in recent years have shown good effects in PVC thermal stability, but when rare earth stabilizers are used alone, the initial stability of the material is not good, and the initial coloring performance is low. , the rare earth composite heat stabilizer can be prepared by compounding the rare earth stabilizer and other metal stabilizers