Cross-linking agent for PBAT and preparation method of cross-linking agent

Abstract

The invention discloses a cross-linking agent for PBAT and a preparation method of the cross-linking agent. The method comprises the following steps that a blend is prepared according to the proportion that the molar ratio of adipic acid to terephthalic acid ranges from 1:5 to 5:1, and the molar ratio of adipic acid and terephthalic acid to polyhydric alcohols ranges from 1:1 to 1:2 and put into a reaction kettle, and unsaturated fatty acid and a catalyst are added; the temperature gradually rises to 200 DEG C to 230 DEG C, reacting is conducted for 4 h to 6 h, and prepolymer is obtained; the temperature is lowered to 80 DEG C to room temperature, acid containing double bonds is added into the prepolymer to serve as a terminator, and reacting is conducted for 6 h to 9 h at 100 DEG C to 140 DEG C, wherein the molar ratio of the terminator to the prepolymer ranges from 1:1 to 1:3; the temperature is lowered to 75 DEG C to 85 DEG C, and then the cross-linking agent for the PBAT is obtained. According to the obtained cross-linking agent, PBAT resin can obtain blow-film grade PBAT resin which is good in processing property and anti-blocking property after cross linking is completed, the acid value of PBAT resin can be decreased, and the service cycle is prolonged.

Description

technical field [0001] The invention relates to a crosslinking agent for PBAT, in particular to a crosslinking agent for PBAT and a preparation method thereof. Background technique [0002] PBAT (polybutylene adipate / terephthalate) is a copolymer of polybutylene adipate and terephthalate, which has excellent biodegradability and has both PBA (polybutyl acrylate) and PBT (Polybutylene terephthalate) has good ductility and elongation at break, as well as good heat resistance and impact performance. Therefore, it has attracted the attention of experts and scholars from all over the world and has become a One of the hotspots of biodegradable plastics research at present. [0003] At present, various PBAT resins have emerged in an endless stream, and their application fields are also expanding, but for now, the film products processed by pure PBAT resin are rare, the main reason is that the film products processed by pure PBAT resin Products, its poor opening, is not conducive ...

AI Technical Summary

Problems solved by technology

[0003] At present, various PBAT resins have emerged in an endless stream, and their application fields are also expanding, but for now, the film products processed by pure PBAT resin are rare, the main reason is that the film products processed by pure PBAT resin Products, its poor opening, is not conducive to processing, and the acid value of pure PBAT resin on the market is generally high, resulting in short degradation cycle and short service life, so it is not conducive to market promotion