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Preparing method for modified poly(beta-hydroxybutyrate) composite

A technology of hydroxybutyrate and composite materials, which is applied in the field of polymer modification and degradable plastics, which can solve the problems of restricting the use of PHB, low melt strength, and restricting the scope of use.

Inactive Publication Date: 2016-06-01
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Poly(β-hydroxybutyrate) (PHB) has attracted widespread attention as a biodegradable material synthesized by microorganisms. PHB is a material with high crystallinity, fast crystallization rate, brittleness and slow degradation rate. Use of PHB
The relatively low molecular weight of PHB also makes it exhibit low melt strength during processing, which also limits the final use range of PHB materials

Method used

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  • Preparing method for modified poly(beta-hydroxybutyrate) composite
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  • Preparing method for modified poly(beta-hydroxybutyrate) composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. First place ethyl cellulose (EC) and poly(β-hydroxybutyrate) (PHB) in a vacuum drying oven, dry at 60°C for 24 hours, cool to room temperature, and make the mass ratio 1:99 The EC and PHB were placed in an internal mixer, the temperature of the internal mixer was controlled at 180 °C, the rotor speed was 90 rpm, and after melt blending for 5 minutes, the poly(β-hydroxybutyrate) modified by ethyl cellulose was obtained. composite material.

[0021] 2. Use a micro-injection molding machine to inject the output into standard dumbbell-shaped (32mm×4mm×2mm) and standard rectangular (80mm×10mm×4mm) specimens for testing tensile and impact properties. The injection process is: barrel temperature 180°C, mold temperature 30°C, injection pressure 600bar, holding pressure 500bar.

Embodiment 2

[0023] 1. First place EC and PHB in a vacuum drying oven, dry at 60°C for 24 hours, cool to room temperature, put EC and PHB with a mass ratio of 5:95 in an internal mixer, and control the temperature of the internal mixer to 180° C., the rotor speed was 90 rpm, and after melt blending for 5 minutes, a composite material of ethyl cellulose-modified poly(β-hydroxybutyrate) was obtained.

[0024] 2. Use a micro-injection molding machine to inject the output into standard dumbbell-shaped (32mm×4mm×2mm) and standard rectangular (80mm×10mm×4mm) specimens for testing tensile and impact properties. The injection process is: barrel temperature 180°C, mold temperature 30°C, injection pressure 600bar, holding pressure 500bar.

Embodiment 3

[0026] 1. First place EC and PHB in a vacuum drying oven, dry at 60°C for 24 hours, cool to room temperature, put EC and PHB with a mass ratio of 20:80 in an internal mixer, and control the temperature of the internal mixer to 180° C., the rotor speed was 90 rpm, and after melt blending for 5 minutes, a composite material of ethyl cellulose-modified poly(β-hydroxybutyrate) was obtained.

[0027] 2. Use a micro-injection molding machine to inject the output into standard dumbbell-shaped (32mm×4mm×2mm) and standard rectangular (80mm×10mm×4mm) specimens for testing tensile and impact properties. The injection process is: barrel temperature 180°C, mold temperature 30°C, injection pressure 600bar, holding pressure 500bar.

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Abstract

The invention provides a preparing method for a modified poly(beta-hydroxybutyrate) composite and relates to the technical field of modification of poly(beta-hydroxybutyrate) and the technical field of degradable plastic.The preparing method comprises the steps that ethylene cellulose (EC) serves as a dispersing phase and is subjected to melt blending with poly(beta-hydroxybutyrate) (PHB) with a proper technology, EC is evenly dispersed in a biodegradable polyester PHB matrix, and a high-performance green polymer material is prepared.In a cellulose-based composite, EC influences the crystal habit and crystallization rate of the matrix polymer, even changes the compatibility and interfacial properties of incompatible blend systems and finally changes the ultimate performance of the matrix polymer, and thus the mechanical property, the crystallization degree and the crystal habit of the composite are controlled.

Description

technical field [0001] The invention relates to the technical field of poly(β-hydroxybutyrate) modification, and also relates to the technical field of degradable plastics. Background technique [0002] In recent years, bio-based polymer materials have been used in different fields to alleviate the environmental pollution caused by non-degradable plastic products. [0003] Poly(β-hydroxybutyrate) (PHB) has attracted widespread attention as a biodegradable material synthesized by microorganisms. PHB is a material with high crystallinity, fast crystallization rate, brittleness and slow degradation rate. use of PHB. The relatively low molecular weight of PHB also makes it exhibit low melt strength during processing, which also limits the final use range of PHB materials. [0004] Cellulose-based materials have been extensively studied due to their wide range of raw material sources and environmentally friendly properties. As a typical cellulose derivative, ethyl cellulose (EC...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/28
CPCC08L67/04C08L2201/06
Inventor 吴德峰陈建香
Owner YANGZHOU UNIV
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