Polyurethane plasticizer, preparation method and application thereof

Abstract

The invention discloses a plasticizer of a polyester compound. The plasticizer is a polyurethane compound containing N-H bonds and a C=O bonds; the polyester compound is blended with a PBAT and is inserted into a PBAT polymer molecule, so that the acting force between molecules is reduced, and the mobility of the PBAT molecule is increased, thereby improving the machinability and the flexibility and achieving the target of plastification. Meanwhile, the polyurethane compound structure contains multiple N-H bonds and C=O bonds, so that a base material PBAT and the polyurethane compound have relatively high hydrogen bond interaction and the target of enhancing the strength of the material is achieved by adopting the bonds as physical crossing points. The obtained plasticized PBAT polymer has excellent mechanical properties such as elongation at break, modulus and tensile strength and relatively good biodegradability.

Description

technical field [0001] The invention belongs to the field of polymers, and relates to a polyurethane plasticizer, its preparation method and application. Background technique [0002] Polybutylene adipate terephthalate (PBAT) is a biodegradable polymer derived from petrochemical resources, which has processing conditions and mechanical properties similar to polyethylene, and has good thermal stability and excellent mechanical properties. However, although PBAT has great application prospects in the production of environmentally friendly biodegradable materials, its high cost and slow biodegradability limit its mass use in the market. [0003] Modified PBAT is an inevitable choice to improve its comprehensive performance and reduce costs. Among them, blending modification is a relatively cheap, convenient and universal plastic modification method, which can blend two or more polymers with complementary properties to obtain properties that cannot be achieved by a single polym...

AI Technical Summary

Problems solved by technology

However, although the addition of these degradable polymers can improve the mechanical properties and degradation rate of PBAT in a certain aspect, the compatibility between biodegradable polymers and PBAT molecular chains is low, and the simultaneous plasticization of PBAT cannot be achieved. Enhanced, not widely used for promotion

On the other hand, there is also a modification method of adding small molecular compounds to PBAT. Although the compatibility problem is solved, the performance of the final modified PBAT polymer material is unstable.

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