High-strength heat-resistant PVC foamed sheet and preparation method thereof

Abstract

The invention relates to the field of PVC foamed boards, and discloses a high-strength heat-resistant PVC foamed board and a preparation method thereof. The high-strength heat-resistant PVC foamed sheet is prepared from the following raw materials in parts by weight: 90 to 100 parts of PVC resin, 0.5 to 0.8 part of a foaming agent, 3 to 7 parts of a foaming regulator, 4 to 6 parts of a heat stabilizer, 3 to 5 parts of chlorinated polyethylene, 20 to 30 parts of argil, 0.5 to 1 part of stearic acid, 0.5 to 1 part of oxidized polyethlene wax and 0 to 3 parts of titanium dioxide. The heat stabilizer is a porous polymer of which the surface is grafted with thiourea and the interior is loaded with calcium carbonate. The heat stabilizer with a special structure is adopted, unstable chlorine atoms in polyvinyl chloride can be replaced, hydrogen chloride can be removed, and therefore strength reduction caused by degradation in the processing and using process of PVC is reduced. Meanwhile, covalent crosslinking can be formed among PVC molecular chains, so that the strength of the PVC foamed sheet is further improved.

Description

technical field [0001] The invention relates to the field of PVC foamed boards, in particular to a high-strength heat-resistant PVC foamed board and a preparation method thereof. Background technique [0002] PVC foam board refers to boards of different specifications made of polyvinyl chloride (PVC) as the main raw material, adding foaming agent, stabilizer, lubricant and other additives, foaming and plasticizing, also known as Chevron board or Andy board. Due to its low density, low thermal conductivity, good sound absorption performance, excellent flame retardancy and chemical resistance, and easy processing by conventional machinery, PVC foam board is now widely used in interior decoration, building compartments in public places, floors, etc. Wait. [0003] Due to the special structure of polyvinyl chloride, it is easy to remove hydrogen chloride on the molecule when it is processed under high temperature and high shear conditions, and catalyze the degradation and dehy...

AI Technical Summary

Problems solved by technology

Among them, although the lead salt stabilizer has excellent thermal stability and low price, it contains heavy metal elements such as lead and cadmium, which is highly toxic and pollutes the environment; although the organotin stabilizer is non-toxic, its smell is relatively heavy. Large, high requirements for production equipment, high production costs, resulting in high prices of organotin heat stabilizers, low cost performance; calcium zinc heat stabilizers are non-toxic, environmentally friendly, and have good lubricity and transparency. However, in the process of action, it will generate Lewis acid zinc chloride, catalyze the degradation of PVC, and there will be significant zinc burning phenomenon, resulting in poor long-term thermal stability. In addition, there is also the problem of poor compatibility with PVC, which will affect the performance of PVC foaming materials. strength

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