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A kind of completely biodegradable polylactic acid composite material and its preparation method and application

A technology of biodegradation and composite materials, which is applied in the field of completely biodegradable polylactic acid composite materials and its preparation, can solve problems such as incomplete degradation, and achieve the effects of solving serious defects, improving toughness, and lowering glass transition temperature

Active Publication Date: 2015-09-23
WUHAN JINFA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also various biodegradable materials made by mixing polylactic acid and traditional plastics on the market, but because a lot of traditional plastic components need to be added to improve their toughness, they cannot be completely degraded. In fact, many of them are only biodegradable. Apparent disintegration rather than true biodegradation

Method used

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  • A kind of completely biodegradable polylactic acid composite material and its preparation method and application
  • A kind of completely biodegradable polylactic acid composite material and its preparation method and application
  • A kind of completely biodegradable polylactic acid composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~6

[0065] 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 fully biodegradable polylactic acid composite material described in Examples 1 to 6.

[0066] 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.

[0067] The screw aspect ratio is 40:1.

[0068] Table 1

[0069]

[0070]

Embodiment 7~12

[0080] 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, then fed into a twin-screw extruder for melt plasticization, extrusion, and granulation to obtain the fully biodegradable polylactic acid composite material described in Examples 7-12.

[0081] 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.

[0082] The screw aspect ratio is 60:1.

[0083] table 3

[0084]

[0085]

[0086] Can reflect from the performance of table 1 and table 2, th...

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Abstract

The invention discloses a completely biodegradable polylactic acid composite material, as well as a preparation method and an application thereof. The completely biodegradable polylactic acid composite material comprises the following components in parts 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, 2-5 parts of plasticizer, 5-20 parts of inorganic filler, 0.1-0.5 part of antioxidant and 0.1-1 part of lubricating agent, wherein the weight average molecular weight of high molecular weight polylactic acid is 0.1 million (Mw is not more than 0.2 million); and the weight average molecular weight Mw of low molecular weight polylactic acid is not less than 0.06 million and not more than 0.1 million. The completely biodegradable polylactic acid composite material disclosed by the invention has high toughness and can be implemented by reasonable compounding of the composition of polylactic acid and avoid the problem that the degradation performance declines due to the addition of traditional plastic into the degradable material for meeting the toughness. The completely biodegradable polylactic acid composite material disclosed by the invention has wider application prospects.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a fully biodegradable polylactic acid composite material and its preparation method and application. Background technique [0002] Polylactic acid (PLA) is a kind of corn starch as raw material, lactic acid is obtained through biological fermentation, and then polymerized to finally obtain polylactic acid resin. It has two advantages: First, it is biodegradable and can be easily decomposed into carbon monoxide and water in the soil, which can be absorbed by plants and recycled. Second, it is a non-petroleum-based plastic, derived from renewable resources such as plants. Under the situation of increasingly tense petroleum energy, the development and research of polylactic acid resin is particularly important. The properties of polylactic acid itself are similar to general-purpose plastic polyene, such as high modulus, high tensile strength and good processability. However, the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/00C08L67/02C08K13/02B29B9/06
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 WUHAN JINFA TECH CO LTD