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Preparation method of plastic starch-modified PBAT (poly(terephthalic acid-buthylene succinate)) biodegradable material

A starch modification and plasticity technology, applied in the field of preparation of biodegradable materials, can solve the problems of not being able to be used as a continuous phase and losing value, and achieve the effects of great social significance and economic benefits, uniform dispersion and excellent mechanical properties

Inactive Publication Date: 2013-04-17
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the molecular chain structure, starch can be divided into two types: amylose and amylopectin. Because it contains a large number of hydroxyl groups, it forms a large number of internal hydrogen bonds and is highly crystalline, so that it becomes granular macroscopically and cannot be used as a continuous phase, so it loses its role as a continuous phase. The value of general purpose plastics

Method used

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  • Preparation method of plastic starch-modified PBAT (poly(terephthalic acid-buthylene succinate)) biodegradable material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The example adopts PBAT chip (Mw160000, MI 0.5g / 10min (150 ℃, 2160g)) 84wt%, tapioca starch 10wt%, plasticizer total content is 6wt%, including glycerin 2.4wt%, formamide 1.2wt%, urea 2.4 wt%.

[0021] The starch gelatinization temperature is 85°C, and the twin-screw extrusion rate is 10r / min; when the plastic starch and PBAT are dried, the vacuum degree is 1.3KPa, the drying temperature is 90°C, and the temperature is maintained for 9 hours; the melt blending temperature is 115°C, and extrusion Speed ​​15r / min.

[0022] The prepared samples were hot-pressed into plates to prepare finished products, and the scanning electron micrograph of the cross-section is shown in figure 1 As shown, the control pressure is 20MPa and the temperature is 140°C. Finally, a biodegradable sheet with a thickness of 1mm was prepared. The starch particle size in the sample was 1-50um and uniformly dispersed, the tensile strength was 15MPa, and the elongation at break was 600%. Days, the d...

Embodiment 2

[0024] Example adopts PBAT chip (Mw130000, MI 3g / 10min (150 ℃, 2160g)) 55wt%, cornstarch 30wt%, plasticizer total content is 15wt%, wherein comprises glycerin 15wt%, formamide 0wt%, urea 0wt%.

[0025] The gelatinization temperature of starch is 80°C, and the twin-screw extrusion rate is 50r / min; when the plastic starch and PBAT are dried, the vacuum degree is 1.0KPa, the drying temperature is 80°C, and kept for 12 hours; the melt-blending temperature is 115°C, and the extrusion Speed ​​50r / min.

[0026] The prepared samples were melt-injected to prepare finished products at a temperature of 150°C. Finally, a biodegradable product with a thickness of 2.5mm is prepared. The starch particle size in the prepared sample is 1-50um and uniformly dispersed, the tensile strength is 10MPa, the elongation at break is 100%, and the compost is at 20°C and the humidity is 30%. Keeping it for 30 days, the degree of degradation reaches 55%.

Embodiment 3

[0028] The example adopts PBAT chip (Mw160000, MI 2.0g / 10min (150 ℃, 2160g)) 70wt%, potato starch 20wt%, plasticizer total content is 5wt%, including glycerol 0wt%, formamide 1.5wt%, urea 3.5 wt%; deionized water 5wt%.

[0029] The starch gelatinization temperature is 130°C, and the twin-screw extrusion rate is 50r / min; when the plastic starch and PBAT are dried, the vacuum degree is 1.0KPa, the drying temperature is 85°C, and kept for 12 hours; the melt blending temperature is 150°C, and the extruded Speed ​​10r / min.

[0030] The prepared samples were melt-casted to prepare finished products at a temperature of 150°C. The starch particle size in the final prepared sample is 1-50um and uniformly dispersed, the tensile strength is 12MPa, the elongation at break is 305%, and the degree of degradation reaches 50% after being kept for 30 days at a compost temperature of 30°C and a humidity of 60%.

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Abstract

The invention relates to a preparation method of a plastic starch-modified PBAT (poly(terephthalic acid-buthylene succinate)) biodegradable material. The preparation method comprises the following three steps: preparing a plastic starch; performing melt blending on the plastic starch and PBAT; and processing the modified material. The plastic starch-modified PBAT biodegradable material can be applied through multiple processing measures of injection moulding, cast moulding, film casting, extrusion moulding and the like. In the modified material, the starch recycling rate is low, and the recycled starch has the particle diameter of 1-50 nm and is uniformly dispersed in a matrix; the tensile strength is 10-15 MPa, the elongation at break is 100-700%, and the melt index (150 DEG C, 2160g) is more than or equal to 1 g / 10 min; and under a composting condition, the plastic starch-modified PBAT biodegradable material is kept for 30 days at the temperature of 20-50 DEG C and the humidity of 30-60%, and 50-75% of the plastic starch-modified PBAT biodegradable material can be degraded. The plastic starch-modified PBAT biodegradable material integrates excellent mechanical properties and biodegradability and has a relatively large potential in industrial application.

Description

technical field [0001] The invention relates to a preparation method of a biodegradable material, in particular to a melting preparation and processing method of a plastic starch-modified PBAT biodegradable material. Background technique [0002] In recent years, due to the enhancement of environmental protection awareness, ecological environmental protection has become the mainstream direction of new material development. Therefore, the research and development and production of biodegradable materials have become popular in major scientific research institutions and multinational companies. PBS, PHB, PHBV, PLA, PBSA, etc. have been successfully applied in daily necessities, automotive interiors, etc. [0003] Despite this, the reason why biodegradable materials have been unable to replace polyolefin products for a long time and cannot occupy a dominant position in the general plastics market is because their production costs are relatively high, and their mechanical proper...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L3/02C08K5/20C08K5/053C08K5/21
Inventor 张勇罗煜张须臻邢潇管丽敏
Owner SHANGHAI JIAO TONG UNIV
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