Organic nucleating agent for preparing heat resistant polylactic acid resin and preparation method thereof

Abstract

The invention discloses an organic nucleating agent for preparing heat resistant polylactic acid resin and a preparation method thereof. The preparation method comprises following steps: (1) mixing terephthalate of metals and a chlorination agent to obtain a mixed solution, adding a catalyst, carrying out reactions to obtain terephthaloyl chloride; (2) mixing alkyl cyclohexane, ethyl acetate, andDMF according to a certain ratio, dropwise adding terephthaloyl chloride into the mixture, and carrying out reactions to obtain a component A; (3) heating polyethylene glycol with a weight percentageof 65-85% to a temperature of 30 to 75 DEG C, and slowly adding the component A into polyethylene glycol under stirring; and (4) adding disodium salicylate into the solution obtained in the step (3),and then mixing the solution with resin emulsion to obtain the nucleating agent. Terephthalate of metals and the chlorination agent are mixed to obtain the mixed solution, then disodium salicylate isadded, the heatproof property and moulding property of polylactic acid resin are improved, and the processing and production period is shortened.

Description

technical field [0001] The invention relates to the field of polylactic acid resin preparation, in particular to an organic nucleating agent for preparing heat-resistant polylactic acid resin and a preparation method thereof. Background technique [0002] Polylactic acid resin is a bio-based and degradable polymer material with excellent physical and mechanical properties, biodegradability and biocompatibility. It has great potential in the fields of agriculture, packaging materials, daily life, clothing and biomedical materials. It has a good application prospect, but its application is still subject to many constraints, the most important of which is the poor heat resistance of polylactic acid resin. The application of resin has been greatly restricted. [0003] In the prior art, in order to improve the heat resistance of biopolymer materials, it is common practice to add nucleating agents during the preparation process; 3 、TiO 2 and BaSO 4 Inorganic salt is added in t...

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Problems solved by technology

[0002] Polylactic acid resin is a bio-based and degradable polymer material with excellent physical and mechanical properties, biodegradability and biocompatibility. It has great potential in the fields of agriculture, packaging materials, daily life, clothing and biomedical materials. It has a good application prospect, but its application is still subject to many constraints, the most important of which is the poor heat resistance of polylactic acid resin. The application of resin has been greatly restricted

[0003] In the prior art, in order to improve the heat resistance of biopolymer materials, it is common practice to add nucleating agents during the preparation process; 3 、TiO 2 and BaSO 4 Inorganic salt is added in the polylactic acid resin as nucleating agent, but can't realize suitability for industrialized production so far; Also someone adopts talcum powder as nucleating agent, for example, the patent that publication number is CN103467947A discloses a kind of using talcum powder as filler and nucleating agent. The polylactic acid resin of agent and preparation method thereof, but the polylactic acid resin of making like this is owing to adding a large amount of talcum powder, and its product toughness is relatively poor, and the heat resistance of product is still unsatisfactory

[0004] Therefore, polylactic acid resin has slow crystallization rate, long molding cycle, and insufficient heat resistance of molded products during use, which seriously restricts the processing and application of polylactic acid resin products. This urgent technical problem has become a hot issue in the field of polylactic acid resin preparation.

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