Lead-free and low-toxicity polyvinyl chloride composite material and preparation method thereof

Abstract

The present invention discloses a lead-free and low-toxicity polyvinyl chloride composite material and a preparation method thereof. The lead-free and low-ticity polyvinyl chloride composite material comprises the following components in part: 100 parts of polyvinyl chloride resin, 8-12 parts of chlorinated polyvinyl chloride, 3.0-5.0 parts of organic composite heat stabilizer, 5-12 parts of organic hydrotalcite, 1-2 parts of polyhydroxy stearate, 3-8 parts of chlorinated polyethylene, and the 0.7-1.3 parts of TiO2. The above materials, as raw materials, are mixed up through the hot-mixing process in a high-speed mixer to be uniformly dispersed. When the temperature of the mixture reaches 123-126 DEG C, the mixture is put to a cold pot to be further stirred till the temperature thereof lowered to 50-60 DEG C. After that, the mixture is put into an anti-clockwise conical twin-screw extruder to be mixed up, extruded and granulated at 165-180 DEG C. The above composite material is lead-free, low in toxicity and good in mechanical performance. The zinc-burning phenomenon of the conventional polyvinyl chloride composite material is improved. Meanwhile, the lead-free and low-toxicity polyvinyl chloride composite material is more environment-friendly.

Description

technical field [0001] The invention relates to the field of polyvinyl chloride composite materials, in particular to a lead-free and low-toxicity polyvinyl chloride composite material and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins (PE, PVC, PP, PS, ABS) in the world. However, the structure of PVC is unstable, and it is easy to degrade during processing and molding. When the processing temperature reaches 90°C, a slight thermal decomposition reaction occurs; when the temperature reaches 120°C, an obvious thermal decomposition reaction occurs, making the color of PVC gradually deepen. Therefore, heat stabilizers must be used to prevent thermal decomposition of PVC during processing. [0003] For example, the Chinese invention patent application with the publication number CN 102382398A discloses a modified polyvinyl chloride composite material and a preparation method, wherein the components ...

AI Technical Summary

Problems solved by technology

However, the current national standards for rain and drainage pipe systems do not limit the content of heavy metals such as lead, and the current production of PVC rain and drainage pipes uses a large number of lead salt stabilizers, which not only may cause great harm to producers during the production process but also to The surrounding environment, including water, soil and air, causes the deposition of heavy metals, which poses immeasurable health risks to humans and animals living in this environment

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