Low cost full-biodegradable polylactic acid sheet material and preparation method thereof

A polylactic acid and all-biological technology, applied in flat products, other household appliances, applications, etc., can solve the problems of limited promotion and application range, impact on physical properties of sheets, high price of polylactic acid sheets, etc., and achieve excellent plasticization extrusion Excellent output, excellent mechanical properties, stable melt viscosity

Active Publication Date: 2009-02-11
ZHEJIANG HISUN BIOMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thermal degradation of the polylactic acid sheet, the molecular weight attenuation is large during melt processing; the scraps generated during the molding process of the polylactic acid sheet and the scraps after the secondary molding of the sheet will account for 35% of the total amount of materials. %, this part of the material cannot be directly recycled for unlimited times, otherwise the physical properties of the sheet will be greatly affected
About 35% of the first-class recycled materials are no longer used in the sheet, which directly leads to a higher price of the polylactic acid sheet, which also limits its promotion and use.

Method used

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  • Low cost full-biodegradable polylactic acid sheet material and preparation method thereof
  • Low cost full-biodegradable polylactic acid sheet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the making of non-transparent polylactic acid sheet

[0037] Take low-molecular-weight polylactic acid resin (i.e. low-molecular-weight polylactic acid resin through one or more processing) according to the weight portion of embodiment 1 in table 1, after stirring cold crystallization at low speed, then mix with high-molecular-weight polylactic acid resin (i.e. new Material polylactic acid resin) mixed and stirred evenly at a medium speed, first remove the moisture in the dry hot air through the molecular sieve system, and then dry under the condition of a closed cycle at a temperature of 80°C, after drying, the moisture content of the polylactic acid resin is less than 150ppm;

[0038] Add the processing aids and fillers of Example 1 in Table 1 to the dried polylactic acid resin, and mix the ingredients evenly after high-speed stirring. In the molecular state, it is fully mixed and a certain chemical reaction occurs; during the melting process, the moistu...

Embodiment 2

[0041] Embodiment 2: the making of transparent polylactic acid sheet

[0042] Take low-molecular-weight polylactic acid resin (i.e. low-molecular-weight polylactic acid resin through one or more processing) according to the weight portion of embodiment 2 in table 1, after low-speed stirring cold crystallization, then mix with high-molecular-weight polylactic acid resin (i.e. new Material polylactic acid resin) mixed with medium-speed stirring, first remove the moisture in the dry hot air through the molecular sieve system, and then dry under closed cycle conditions at a temperature of 90 ° C, after drying, the moisture content of the polylactic acid resin is less than 150ppm;

[0043] Add the processing aid of Example 2 in Table 1 to the dried polylactic acid resin, and mix the ingredients evenly after stirring at a high speed. Fully mixed in the state, and a certain chemical reaction occurs; in the melting process, the water in the melt and other small molecules are separated...

Embodiment 3

[0046] Embodiment 3: the making of non-transparent polylactic acid sheet

[0047] Take low-molecular-weight polylactic acid resin (i.e. low-molecular-weight polylactic acid resin through one or more processing) according to the weight portion of embodiment 3 in table 1, after low-speed stirring cold crystallization, then mix with high-molecular-weight polylactic acid resin (i.e. new Material polylactic acid resin) mixed at a medium speed and evenly stirred, first remove the moisture in the dry hot air through the molecular sieve system, and then dry under the condition of a closed cycle at a temperature of 100°C, after drying, the moisture content of the polylactic acid resin is less than 150ppm;

[0048] Add the processing aids and fillers of Example 3 in Table 1 to the dried polylactic acid resin, and mix the ingredients evenly after stirring at a high speed. In the molecular state, it is fully mixed and a certain chemical reaction occurs; during the melting process, the moi...

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Abstract

The invention provides a low-cost full-biodegradation polylactic acid sheet and a preparation method thereof, which belong to the technical field of biomaterial. The invention solves the problems that molecular weight attenuation is larger, about 35 percent of the materials with one grade are incapable of directly being recycled to participate in the use, the cost is high as well as popularization and use range are limited during the melt processing of the polylactic acid sheet. The low-cost full-biodegradation polylactic acid sheet is extruded and shaped by the components as the following weight portions: 100 portions of high molecular weigh polylactic resin; 10 to 100 portions of low molecular weigh polylactic resin and 0.2 to 30 portions of processing materials; the number average molecular weight of the high molecular weigh polylactic resin is 90,000 to 150,000 Daltons; the number average molecular weight of the low molecular weigh polylactic resin is 50,000 to 90,000 Daltons. The low-cost full-biodegradation polylactic acid sheet has the advantages of low cost, good mechanical property, good durability, excellent secondary shaping property, simple method and technique flow as well as high maneuverability.

Description

technical field [0001] The invention relates to a biodegradable polymer material and a preparation method thereof, in particular to a low-cost fully biodegradable polylactic acid sheet and a preparation method thereof; belonging to the technical field of biological materials. Background technique [0002] The negative impact of waste polymer materials on the environment has aroused widespread concern, and solving the serious "white pollution" problem has become a concern of many countries. In this situation, the research and development of biodegradable polymer materials has attracted people's attention, and some biodegradable polymer materials have begun to be used in industrial production. It has various physical properties of ordinary plastics, can be widely used, and can not pollute the environment after being used and discarded. It can be completely decomposed into carbon dioxide and water through a certain temperature, humidity and natural microorganisms. Vigorously p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08K13/02C08K5/57C08K5/10C08K5/526B29C47/12B29C47/92B29B13/06B29L7/00B29C48/30B29C48/92
CPCB29C47/92
Inventor 梁伟边新超吴伟王若松
Owner ZHEJIANG HISUN BIOMATERIALS
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