Polyvinyl chloride accounts for more than 30% of China's plastic products. The recycling of waste PVC is mainly to directly recycle or supplement appropriate new materials and to re-make various products. When these recycled materials are dirty and can no longer be used for other products, they can still be used for infrastructure and water conservancy products (pipes, tanks, belts, plates, etc.).
1 Direct reuse of recycled PVC recycled and recycled products should be based on different types of additives added to meet the requirements. The formula is shown in the table below.
Waste PVC Recycling Formula
Material Soft Rigid Plastic Foam Waste PVC 100.0 100.0 100.0
Dibutyl phthalate 10.0 - 5.0
Alkylbenzene sulfonate 5.0 - 5.0
Tribasic lead sulfate 1.0 1.5 0.5
Strontium stearate 0.8 1.0 1.0
Stearic acid or paraffin 0.2 0.2 0.2
Azodicarbonamide -- —— 6.0
The composition of PVC is more complex. In addition to the resin, there are a certain amount of auxiliary materials such as plasticizers, stabilizers, lubricants, and pigments. During the use of these additives, due to light and heat, there will be different degrees of volatilization and loss. In the process of copying, it is necessary to make an appropriate amount of supplements so that after the polyvinyl chloride waste plastic is replicated, better physical performance can be maintained.
2 Asphalt mat and plastic ointment to react waste polyethylene plastic with coal tar in a reactor. In the presence of a catalyst, naphthoquinone in coal tar and other components with a relatively small degree of aggregation tend to be chained with polyvinyl chloride. Molecular reaction produces cross-linking, forming a two-dimensional network structure, so that the modified tar pitch softening point increases.
Its performance is better than that of general petroleum asphalt felt and tar asphalt felt, especially low temperature resistance, and is particularly suitable for construction use in northern regions. Its specific operation: adding asphalt in the enamel reaction kettle, electric stirring with 150 ~ 200r/min, and heated to 150 ~ 170 °C under the reaction for 3h, then add the filler, stir for a moment to get the electric modified tar pitch.
Basic formula: tar 100, waste PVC plastic 12 to 15, plasticizer 29 to 32, filler 30 to 50.
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