A kind of PVC plasticizer and preparation method thereof

Abstract

The invention discloses a novel PVC (Polyvinyl Chloride) plasticizer and a preparation method thereof. The plasticizer is epoxy soybean oil-based polyester,r and is prepared by the following reactionstages: the first stage: reacting 70 to 80 parts of epoxy soybean oil, 20 to 30 parts of monobasic acid and 0.5 to 1 part of first catalyst at the temperature of 50 to 80 DEG C for 3 to 6 hours to obtain epoxy soybean oil polyol; the second stage: reacting 82 to 88 parts of the epoxy soybean oil polyol, 12 to 18 parts of lactone and 0.5 to 1 part of second catalyst at the temperature of 65 to 80 DEG C for 2 to 3 hours to obtain primary hydroxyl epoxy soybean oil polyol; the third stage: reacting 60 to 70 parts of the primary hydroxyl epoxy soybean oil polyol, 30 to 40 parts of diacid or dihydric alcohol and 3 to 5 parts of third catalyst at room temperature for 2 to 4 hours to generate the epoxy soybean oil-based polyester in a reaction medium. The preparation method disclosed by the invention has the advantages of simple preparation process, mild conditions, low-cost and easily-obtained raw materials, high yield and facilitation for reducing the production cost of an enterprise; the prepared product has good plasticizing effects on hard or semi-rigid PVC; meanwhile, the mechanical properties of the PVC can be effectively improved and the tensile strength of the PVC cannot be reduced; the novel PVC plasticizer has an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis and preparation of polymer additives, and in particular relates to a PVC plasticizer and a preparation method thereof. Background technique [0002] Plasticizers are one of the plastic additives with the largest output and consumption in the world, among which phthalates are the most widely used plasticizers. However, since the National Cancer Institute of the United States found that large doses of dioctyl phthalate (DOP) can cause cancer in mice, various countries have passed laws and regulations to limit the maximum amount of phthalate plasticizers in products. These laws have a great impact on our country's exports. For this reason, it is an urgent task to find non-toxic, environmentally friendly alternatives to phthalates. Vegetable oil is a product of photosynthesis and has good environmental protection properties. Therefore, it is of great significance to develop vegetable oil-b...

AI Technical Summary

Problems solved by technology

The fly in the ointment is that the plasticizers based on epoxidized soybean oil in the existing market cannot play a good role in plasticizing rigid or semi-rigid PVC while improving its mechanical properties without reducing its tensile strength