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Biodegradable polylactic acid composite material, and preparation method and application thereof

A technology of biodegradation and composite materials, which is applied in the field of biodegradable polylactic acid composite materials and its preparation, can solve the problems of high price of polylactic acid, improve impact strength and tensile elongation at break, reduce glass transition temperature, and solve The effect of severe defects

Active Publication Date: 2013-05-08
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of polylactic acid is high, and the toughness, heat resistance, hydrolysis resistance, etc. still need to be further improved before it can be used more widely.

Method used

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  • Biodegradable polylactic acid composite material, and preparation method and application thereof
  • Biodegradable polylactic acid composite material, and preparation method and application thereof
  • Biodegradable polylactic acid composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~6

[0079] According to the proportioning in Table 1, the polylactic acid component and the biodegradable copolyester are first mixed in a mixer, and then dried to obtain a premix; then the premix is ​​mixed with a plasticizer, an inorganic filler, an antioxidant 1. The lubricant was mechanically blended in a high mixer for 5 minutes, and then fed into a twin-screw extruder for melt plasticization, extrusion, and granulation to obtain the biodegradable polylactic acid composite material described in Examples 1 to 6.

[0080] The twin-screw extruder is a co-rotating parallel twin-screw extruder, and its set temperature is: Zone 1: 130-150°C, Zone 2: 160-180°C, Zone 3: 170-190°C, Zone 4: 175~195℃, Zone 5: 175~195℃, Zone 6: 180~200℃, Zone 7: 180~200℃, Zone 8: 180~200℃, Zone 9: 180~200℃, Machine head: 175- 195°C, screw speed: 300rpm.

[0081] The screw aspect ratio is 40:1.

[0082] Table 1

[0083]

[0084]

Embodiment 7~12

[0094] According to the proportioning of Table 3, the polylactic acid component and the biodegradable copolyester are first mixed in a mixer, and then dried to obtain a premix; then the premix is ​​mixed with a plasticizer, an inorganic filler, an antioxidant 1. The lubricant was mechanically blended in a high mixer for 5 minutes, and then fed into a twin-screw extruder for melt plasticization, extrusion, and granulation to obtain the biodegradable polylactic acid composite material described in Examples 7-12.

[0095] The twin-screw extruder is a co-rotating parallel twin-screw extruder, and its set temperature is: Zone 1: 130-150°C, Zone 2: 160-180°C, Zone 3: 170-190°C, Zone 4: 175~195℃, Zone 5: 175~195℃, Zone 6: 180~200℃, Zone 7: 180~200℃, Zone 8: 180~200℃, Zone 9: 180~200℃, Machine head: 175- 195°C, screw speed: 400rpm.

[0096] The screw aspect ratio is 60:1.

[0097] table 3

[0098]

[0099] It can be reflected from the performance of Table 1 and Table 2 that the ...

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PUM

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Abstract

The invention discloses a biodegradable polylactic acid composite material, and a preparation method and an application thereof. The biodegradable polylactic acid composite material comprises the components of, by weight, 100 parts of high-molecular-weight polylactic acid, 10-40 parts of low-molecular-weight polylactic acid, 10-30 parts of biodegradable copolyester, 0.1-3 parts of a chain extender, 0.1-3 parts of an anti-hydrolysis agent, 0.1-5 parts of a nucleating agent, 5-20 parts of an inorganic filler, and 0.1-0.8 parts of an antioxidant. The weight average molecular weight Mw of the high-molecular-weight polylactic acid is greater than 100000 and no greater than 200000, and the weight average molecular weight Mw of the low-molecular-weight polylactic acid is no lower than 60000 and no greater than 100000. The polylactic acid composite material provided by the invention has high melt strength, high toughness, high heat resistance, high water resistance and good processing properties. The material can be widely applied in the fields such as toys, offices, cars and electronic appliances.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a biodegradable polylactic acid composite material and its preparation method and application. Background technique [0002] At present, with the shortage of petroleum resources, environmental pollution has become one of the most important problems in human existence, and degradable non-petroleum-based polymer materials have attracted more and more attention. Polylactic acid is a polymer material obtained from corn fermentation and repolymerization. It is an environmentally friendly and degradable material. At the same time, polylactic acid has good stretchability, flexibility and light transmission, and can be used in various polymer material fields. . However, the price of polylactic acid is high, and the toughness, heat resistance, hydrolysis resistance, etc. still need to be further improved before it can be used more widely. Therefore, how to improve the toughness of polyl...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08K13/02C08K5/29C08K3/26C08K3/34C08K3/36C08K3/22B29C47/92B29C48/92
CPCB29C48/04B29C48/40
Inventor 熊凯焦建钟宇科苑仁旭赵巍徐依斌曾祥斌蔡彤旻夏世勇
Owner KINGFA SCI & TECH CO LTD
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