Polylactic acid foaming material and preparation method thereof

A technology of polylactic acid foaming and polylactic acid, which is applied in the field of polymer materials, can solve problems such as poor impact resistance, brittle polylactic acid, and difficult processing, and achieve improved elongation at break, impact resistance, easy processing, and low cost. low effect

Inactive Publication Date: 2010-01-06
南京冠创生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of polylactic acid brittleness, poor impact resistance and difficult processing in the prior art, the present invention provides a polylactic acid foam material and its preparation method. The preparation method is simple in process and low in cost, and the obtained foam Plastic biodegradable, high tensile strength, high elongation at break and good impact resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Poly-L-lactic acid with a weight average molecular weight of 225,000, polybutyl succinate (PBS), talcum powder, and AC foaming agent were mixed in an internal mixer at 120°C according to the following weight ratio 93:5:1:1 5 minutes. After the obtained mixture was pressed into a sheet on a 150° C. flat vulcanizer, it was freely foamed in a 170° C. flat vulcanizer for 2 minutes. The measured molecular weight of polylactic acid was 182,000. The resulting foam has a density of 0.62 g / cm 3 .Mechanical properties: tensile strength 16.8Mpa, elongation at break 22.5%, impact strength (Izod) 5.6KJ / m 2 . Biodegradation experiments confirmed that it can be completely degraded.

Embodiment 2

[0034] Organomontmorillonite DK4, ADC- The DT low-temperature foaming agent is mixed in an internal mixer at 150°C for 5 minutes according to the following ratio of 88:8:2:2. After the obtained mixture was pressed into a sheet on a 170° C. flat vulcanizer, it was freely foamed in a 190° C. flat vulcanizer for 5 minutes. The measured molecular weight of polylactic acid is 128,000. The resulting foam has a density of 0.43 g / cm 3 .Mechanical properties: tensile strength 11.5Mpa, elongation at break 35.6%, impact strength (Izod) 4.7KJ / m 2 . Biodegradation experiments confirmed that it can be completely degraded.

Embodiment 3

[0036]The molecular weight is 262,000 poly-L-lactic acid, polybutyl succinate (PBS), silicon dioxide, 2,2'-azobisisobutyronitrile (AZDN) according to the following ratio 80:10:5:5 in dense Knead for 5 minutes at 140°C in the mixer. After the obtained mixture was pressed into a sheet on a 160° C. flat vulcanizer, it was freely foamed in a 170° C. flat vulcanizer for 10 minutes. The measured molecular weight of polylactic acid was 221,000. The resulting foam has a density of 0.37 g / cm 3 .Mechanical properties: tensile strength 20.4Mpa, elongation at break 65.2%, impact strength (Izod) 8.2KJ / m 2 . Biodegradation experiments confirmed that it can be completely degraded.

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Abstract

The invention provides a polylactic acid foaming material and a preparation method thereof. The polylactic acid foaming material is prepared from the following ingredients according to parts by weight: 45-93 parts of polylactic acid, 5-28 parts of toughener, 1-5 parts of nucleating agent and 1-10 parts of foaming agent. The polylactic acid is one of poly-L-lactic acid, poly-D-lactic acid and poly-DL-lactic acid or a mixture or a polymer thereof, and has the weight average molar mass of 0.8-3.5 million, molecular weight distribution of 1.2-2.5, and degree of crystallinity of 15-60 percent. The toughener is one of poly succinic acid butyl ester and poly adipate/butylene terephthalate or a mixture of two with random ratio. Other accessory ingredients can also be added. The preparation method comprises the following steps: evenly mixing the polylactic acid, the toughener, the nucleating agent, the foaming agent, the accessory ingredients and the like in a high mixing machine according to a certain proportion, then milling for 5-25 minutes at the temperature of 100-170 DEG C, and carrying out die pressing foaming on obtained materials at the temperature of 120-210 DEG C on a vulcanizing machine for 2-10 minutes to prepare the polylactic acid foaming material. The polylactic acid foaming material prepared by using the preparation method has the advantages of high resistance to shock, high elongation at break, high tensile strength and complete biodegradation after used.

Description

1. Technical field [0001] The invention belongs to the field of polymer materials, and more specifically relates to a polylactic acid foam and a production method thereof. 2. Background technology [0002] The vast majority of petroleum-based plastics used in human daily life, although they are cheap, have poor degradability and become a source of pollution that damages the environment after use. [0003] In order to replace petroleum-based polymer materials with poor degradability, some fully biodegradable polymer materials have been synthesized by biological or chemical methods. The method of fermentation into lactic acid and then ring-opening polymerization synthesizes completely biodegradable polylactic acid. Polylactic acid can be completely decomposed into carbon dioxide and water through hydrolysis and microbial decomposition. It can be used in the atmosphere, in soil or water, in garbage The required decomposition time in landfill and in compost is 3-5 years, 2-3 ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08J9/10C08J9/08C08J9/06
Inventor 邹俊舒友郭彦斌陈悬姜徐斌
Owner 南京冠创生物科技有限公司
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