Preparation of calcium zinc composite stabilizer for processing plastic

Abstract

The invention discloses a method for preparing calcium zinc compound stabilizer used for the processing of PVC plastic; the invention is characterized by comprising: (1) organic acid, calcium oxide, and zinc oxide powder are dispersed in a water phase, and then under the function of a phase transfer catalyst, an organic acid calcium zinc compound is generated by reaction; (2) the compound which is obtained in step (1) is heated and added with an oil and grease substance, and then stirred until the material is completely separated from the water phase; and (3) the product which is obtained by separation is placed in a two-roll kneading machine, later heated to 130 DEG C, and then stirred and gradually added with antioxidant, stabilizing additives, and organic stabilizer; after tabletting and forming, a finished product is obtained. The invention is finished by one step, has short flow process, and does not produce waste; the formula of the method is optimized, the obtained composite calcium zinc stabilizer has high thermal efficiency, and the stabilizing time is improved by 50-100% compared with the products sold in the market; and the product takes the shape of a tablet or small particle, and has the advantages of no dust pollution, low beginning melting temperature, and wide adaptability.

Description

technical field [0001] The present invention relates to plastic additives. Background technique [0002] With the rapid development of social civilization, some products and technologies are no longer suitable, such as heat stabilizers for PVC plastic processing, and original heavy metal products, such as salts containing cadmium, lead, barium, and tin, are likely to cause danger to the human environment , countries such as Europe and the United States have issued some relevant regulations to restrict or prohibit the manufacture and use of such products. Subsequently, some low-toxic and non-toxic products appeared. Commercially available non-toxic and low-toxic calcium-zinc PVC plastic stabilizers have many deficiencies: [0003] 1. The thermal stabilization efficiency is not high, and the thermal stabilization time is short. Congo red test paper method (CB8815-2002), the thermal stability time at 200°C is generally 25-35 minutes; [0004] 2. Relatively high cost, the se...

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Problems solved by technology

[0004] 2. Relatively high cost, the selling price is about 20-50% higher than that of general traditional products;

[0005] 3. Generally in powder form, inconvenient to use

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