Completely biodegradable polyhydroxyalkanote / poly(butylene succinate) blending alloy

Abstract

The invention discloses a full biodegradable N-poly-ester / poly butylene succinate blending alloy, which is characterized in that the blending alloy is prepared from N-poly-ester, poly butylene succinct, starch, filler and the other auxiliary agents. The blending alloy uses the heat resistance, good processing and forming property, higher crystallizing property, good tensile strength and impact toughness of the poly butylene succinate to improve the defects of poor heat resistance, serious processing and forming viscous, slow crystallization and lower mechanical strength of the N-poly-ester, and reduce the cost and widen the application range, the obtained blending alloy has good comprehensive performance, and can be applied in the fileds of blowing film, extruding sheets, injecting one-off environmental supplies and medical treatment.

Description

【Technical field】 [0001] The invention relates to the field of materials, in particular to a fully biodegradable polyhydroxyalkanoate / polybutylene succinate blend alloy. 【Background technique】 [0002] The traditional plastic industry consumes a lot of petroleum energy and the "white pollution" has attracted more and more attention. Since the 1960s and 1970s, people have begun to research and develop biodegradable plastics. At present, there are A variety of biodegradable materials (Biodegradable materials) have come out. After biodegradation, biodegradable materials become water and carbon dioxide, which will not cause harm to the environment. [0003] Polyhydroxyalkanoates (PHAs) are a class of polymer polyesters synthesized by microorganisms, with molecular weights generally ranging from tens of thousands to several million, and widely exist in a variety of microorganisms in nature. Due to the difference of polymerized monomers and degrees of polymerization, PHAs can cha...

AI Technical Summary

Problems solved by technology

At the same time, its processing performance is very good, but the disadvantages of PBS are its high crystallinity (30%--60%), brittle physical properties, not very high elongation at break, and slow degradation rate

[0006] The methods that have been disclosed to improve the defects of PBS mainly include: copolymerization, grafting and crosslinking, blending with starch, adding nucleating agents, etc., but both copolymerization and grafting can only stay in the research stage and are difficult to industrialize

Starch blending can only partially solve the problem of accelerating the biodegradation rate, and the nucleating agent can only improve and accelerate the crystallization nucleation, and the effect is not obvious

Such as the Chinese published patent application [publication number is CN101045810A] proposed to use PBS or PLA (polylactic acid) and cross-linking agent to improve PHB (poly-β-hydroxybutyrate) and PHBV (poly-β-hydroxybutyrate-β-hydroxypentyl acid ester) material toughness, although the toughness of PHB and PHBV is improved to a certain extent, but this invention is to make PHB or PHBV and PBS co-crosslinking by crosslinking agent under melting condition, and melting temperature is higher (160-190 ℃), The reaction time is also longer, and PHB or PHBV is prone to produce harmful substances such as crotonic acid under such reaction conditions, the reaction yield is low, the reaction product is complicated, and the expected reaction effect cannot be achieved