Low-odor environmentally-friendly polyvinyl chloride (PVC) composite material

Abstract

The invention relates to the field of polymer materials, and specifically relates to a low-odor environmentally-friendly polyvinyl chloride (PVC) composite material. The composite material at least comprises the following components in parts by weight: 80 to 110 parts of polyvinyl chloride resin, 4 to 12 parts of chlorinated polyethylene, 8 to 20 parts of butyl etherified urea-formaldehyde resin, 15 to 40 parts of plasticizer, 4 to 10 parts of benzhydrazide derivatives, 0.1 to 0.8 part of lubricant, 0.5 to 3 parts of fire retardant, 1 to 3 parts of vermiculite powder, and 1 to 3 parts of montmorillonite; wherein the weight-average molecular weight of the polyvinyl chloride resin is in a range of 60000 to 120000, the plasticizer is a citrate plasticizer, and the lubricant is a fatty acid or metal soap lubricant.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a low-odor environment-friendly polyvinyl chloride composite material. technical background [0002] Polyvinyl Chloride (PVC) is one of the earliest industrialized synthetic resins in the world. Because of its advantages such as excellent performance, low price, and wide source of raw materials, it has been widely concerned and developed rapidly. Polyvinyl chloride was industrialized in the early 1930s. Since the 1930s, for a long time, the output of polyvinyl chloride has always ranked first in the world's plastic consumption. In the late sixties, polyethylene replaced polyvinyl chloride. Although polyvinyl chloride plastic has relegated to the second place today, its output still accounts for more than a quarter of the total plastic output. Compared with other polymer materials, because polyvinyl chloride is polymerized from vinyl chloride (Vinyl Chloride), it has a high chl...

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Problems solved by technology

(2) Poor toughness: PVC is a material composed of polar molecules, and its molecular mobility is poor

According to Vincent's characterization of the brittle-ductile fracture behavior of polymers, polyvinyl chloride is a brittle and hard material with poor toughness and is easily broken when subjected to external forces, so that its products have certain restrictions on the use temperature; rigid polyvinyl chloride The lower limit of the use temperature is minus 30 degrees, and the lower limit of soft polyvinyl chloride is minus 15 degrees, and it is more likely to break when the temperature is lower than the lower limit.

(3) Poor processability: polyvinyl chloride has a high melting point, but if the heating temperature is too high, it will cause the crystals contained in it to decompose, resulting in a decrease in performance. Poor, easy to block

(4) Plasticizer migration: The plasticizers used in soft PVC materials are generally small molecule plasticizers, which are prone to migration, volatilization, and dissolution during processing and use, so that the content of plasticizers continues to decrease , causing the material to become brittle and affecting performance

At the same time, due to the toxicity of some plasticizers and the small molecular organic substances produced by the decomposition of plasticizers, some PVC materials have an unpleasant smell, which will cause certain pollution to the environment.

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