Degradable polyvinyl chloride film and preparation method thereof

Abstract

The invention discloses a degradable polyvinyl chloride film, which consists of 100 parts of chloride resin PVC-SG4 or TK-1200, 1.5 to 3.5 parts of composite nano heat stabilizer mainly comprising nano lead or nano zinc, or nano lead and zinc mixture, industrial barium stearate, zinc stearate, epoxidized soybean oil and a tetrabutyl orthotita coupler, and 30 to 60 parts of plasticizer which is mainly dioctyl phthalate, dibutyl phthalate, dioctyl sebacate, epoxy-ester, alky sulfonic acid m-tolyl chloroformate, chlorcosane or phenyl alkylsulf. The preparation method comprises the following steps: 1, preparing nano lead or nano zinc inorganic heat stabilizer; 2, preparing the composite nano heat stabilizer; 3, preparing plastic particles of the degradable polyvinyl chloride film; and 4, preparing the degradable polyvinyl chloride film. The degradable polyvinyl chloride film has the advantages of natural degradation, no toxin or low toxin, certain transparency, air permeability, fogdrop resistance, low production cost, capacity of being produced by the conventional equipment, and convenient promotion.

Description

【Technical field】 [0001] The invention relates to the technical field of chemical engineering, and relates to a degradable polyvinyl chloride (PVC) film and a preparation method thereof. Specifically, it is a composite nano-heat stabilizer and a composite nano-heat stabilizer mainly composed of nano-lead or nano-zinc added by PVC resin for the film. The plasticizer is plasticized and granulated, and the degradable PVC film is formed by blow molding by a blow molding machine or calendered by a four-roller calender and a preparation method thereof. 【Background technique】 [0002] At present, the output of PVC resin is second only to polyethylene (PE), and it is the second largest general-purpose plastic in the world. The current annual consumption of PVC film in my country is about 500,000 tons or more. However, PVC film brings convenience to people's lives and also brings troubles to humans. Since PVC film cannot be decomposed naturally and will exist for a long time, once it...

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Problems solved by technology

However, this patented technology has the following deficiencies: when preparing nano-lead, the zeolite powder used has no pore-expanding treatment, and the adsorption capacity of lead ions is only below 3%, and the lead ion is oxidized and reduced to Lead oxide reduces the heat-stabilizing activity of PVC, and the process adopted does not settle the excess lead ions in the solution, so that the residual lead in the waste liquid cannot meet the waste water discharge standard with a lead content of less than 30ppm In addition, due to the low lead content of its products, a large amount of nano-lead must be added when processing PVC films, especially its zeolite powder has poor dispersion and fluidity in plastics, which will affect the processing characteristics of PVC films and the mechanical and physical properties of films. ; Moreover, due to the use of zeolite as a carrier, this porous material has a particularly strong hygroscopicity, and its water content is usually about 4%. No matter how dry it is, there will still be a problem of high hygroscopicity. When processing PVC films, the water content of additives is required Not more than 0.5%, therefore, this technology cannot meet the requirements of PVC film processing

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