Polyvinyl chloride sealing strip composition and preparation method thereof

Abstract

The invention discloses a polyvinyl chloride sealing strip composition and a preparation method thereof, and belongs to the technical field of processing and application of polymer materials. The polyvinyl chloride sealing strip composition comprises, by weight, 100 parts of PVC resin, 95-97 parts of a plasticizer, 4-5 parts of a calcium-zinc stabilizer, 0.2-0.3 part of an antioxidant, 18-20 partsof a filler and 0.3-0.5 part of a lubricant; and the plasticizer is a polyester plasticizer and carbon dioxide-based polymer compound. The polyvinyl chloride sealing strip composition has high anti-precipitation performance, the adhesion stress of a PCM plate is 9.5-10.5 N, and the preparation method can meet 80 m/min high-speed extrusion production, and improves the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of processing and application of polymer materials, and in particular relates to a polyvinyl chloride sealing strip composition and a preparation method thereof. Background technique [0002] Polyvinyl chloride is currently the plastic material with the largest output and the cheapest price in China. Since polyvinyl chloride can be used for hard products, it can also be used for soft products after adding plasticizers. It has excellent performance and is widely used; therefore, in In the field of sealing materials for refrigerators, freezers, incubators, and residential doors and windows, soft polyvinyl chloride is still the main material. However, the current sealing strips based on polyvinyl chloride still have many defects in use, such as poor resilience of the produced sealing strips, insufficient low temperature resistance of the material, and easy precipitation of plasticizers used in modified PVC. ...

AI Technical Summary

Problems solved by technology

Chinese patent CN103554712A discloses a low temperature resistant PVC sealing strip composition, but does not mention the type of plasticizer used in PVC

The present invention finds in the experiment that adopt high melt index, high molecular weight plasticizer of ethylene-vinyl acetate copolymer of high VA content, although the bonding force of sealing strip and PCM sheet material can be accomplished very little, but these polymer plasticizers The plastics are all pellets, and the uniformity of blending with PVC resin powder is not good, resulting in unstable performance of the sealing strip, and these pellets often suffocate the feeding screw in the twin-screw extrusion granulation; moreover, these high Molecular plasticizers are used in a large amount in the formula, and the price is relatively high relative to the market, and it is not easy to purchase, which limits the application of polymer plasticizers in PVC sealing strips