Hydrotalcite-rare earth composite environmental protection stabilizer for PVC, and preparation method thereof

Abstract

The present invention provides a hydrotalcite-rare earth composite environmental protection stabilizer for PVC, wherein the hydrotalcite-rare earth composite environmental protection stabilizer is prepared from the following raw materials by weight: 20-30 parts of modified magnesium aluminum hydrotalcite, 8-10 parts of dimethyltin dichloride, 6-9 parts of lanthanum salicylate, 1-3 parts of triphenyl phosphite, 15-17 parts of tri-octyl tri-meta-benzoate, 3-6 parts of magnesium stearate, 2-4 parts of epoxy sunflower oil, 5-6 parts of tetra(hydroxymethyl)cyclohexanol, 1-2 parts of 2-hydroxy-4-n-octyloxybenzophenone, 1-2 parts of castor wax, 3-5 parts of zinc stearate, 4-5 parts of magnesium oxide, and 10-13 parts of barium sulfate. According to the present invention, the PVC stabilizer has characteristics of good thermal stability, good processing performance, environmental protection, no toxicity, low cost, good plasticity and balance torque reducing during the PVC processing process, and low cost.

Description

technical field [0001] The invention relates to the field of PVC additives, in particular to a PVC hydrotalcite rare earth composite environmental protection stabilizer and a preparation method thereof. Background technique [0002] With its superior physical properties and low cost, PVC is widely used in chemical industry, materials, machinery, agriculture, daily necessities and other fields, especially in the field of plastics, and is known as one of the five general-purpose plastics. 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, it is mainly to add an appropriate amount of stabilizer during the thermal processing of PVC. [0003] The only heat stabilizers that are generally industr...

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Problems solved by technology

Rare earth heat stabilizers have good thermal stability, but the early thermal stability is not high, and the initial coloring is poor, so they cannot be the main stabilizer alone, so their application and promotion are limited. The application of a single rare earth heat stabilizer is often difficult to meet the needs of PVC processing. Composite and multi-functional rare earth heat stabilizers have become the development trend according to the requirements of application performance