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Fully-biodegradable composition and preparation method thereof

A technology of biodegradable polyester and composition, applied in the field of fully biodegradable composition and its preparation, can solve the problems of limited application and high cost of toughening agent, and achieve the effect of promoting application, low cost and good compatibility

Active Publication Date: 2013-06-12
WEIHAI LIANGAN ENVIRONMENTAL PROTECTION NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the toughening agent synthesized by this method is relatively high, and the use of its modified polylactic acid is not conducive to reducing the overall cost of the material, so its application is limited

Method used

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  • Fully-biodegradable composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put castor oil and L-lactic acid respectively in the polycondensation reactor, and vacuumize at 60°C for 2 hours to remove the moisture in the raw materials. Then castor oil and L-lactic acid are taken as 1: 1 according to the amount ratio of substances, and 0.1% stannous chloride dihydrate that accounts for the total mass of raw materials is used as a catalyst; The polycondensation reaction was carried out for 8 hours under the atmosphere, and then vacuumized, and the reaction was continued for 10 hours under vacuum. After the reaction, the number-average molecular weight of the obtained copolymer was 48000, which was the required toughening agent and was ready for use.

[0038] Polylactic acid PLA (provided by Nature Works, 4032D) and PBS (provided by Anqing Hexing Company, blown film grade) were dried in a blast oven at 60°C for 24 hours, and calcium carbonate (800 mesh) was dried in a blast oven at 105°C 10h.

[0039] Take 80 parts of PLA, 20 parts of PBS, 5 parts ...

Embodiment 2

[0042]Put the polycastor oil and D-lactic acid in the polycondensation reactor respectively, and vacuumize at 80°C for 1 hour to remove the moisture in the raw materials. Then take polycastor oil and D-lactic acid as 1: 300 according to the amount ratio of substance, and take 0.5% tin protochloride dihydrate that accounts for the total mass of raw materials as a catalyst; raw materials are added in the polycondensation reactor, and the system is first at 150 ° C, The polycondensation reaction was carried out for 4 hours under a nitrogen atmosphere, and then vacuumized, and the reaction was continued for 5 hours under vacuum. After the reaction, the number-average molecular weight of the obtained copolymer was 63,000, which was the required toughening agent and was ready for use.

[0043] PLA (provided by Nature Works, 2002D) and PBSA (provided by Anqing Hexing Company, blown film grade) were dried in a blast oven at 80°C for 6 hours, and talc powder (1250 mesh) was dried in a b...

Embodiment 3

[0047] Epoxy soybeans and DL-lactic acid were placed in polycondensation reactors respectively, and vacuumed at 70°C for 2 hours to remove moisture in the raw materials. Then take epoxidized soybean oil and DL-lactic acid as 1: 200 according to the amount ratio of substances, and take 0.2% stannous octoate that accounts for the total mass of raw materials as a catalyst; raw materials are added in the polycondensation reactor, and the system is first at 160 ° C under a nitrogen atmosphere The polycondensation reaction was carried out for 3 hours, and then vacuumized, and the reaction was continued for 6 hours under vacuum. After the reaction, the number average molecular weight of the obtained copolymer was 71000, which was the required toughening agent and was ready for use.

[0048] PLA (provided by Nature Works, 4032D) and PBAT (provided by BASF, blown film grade) were dried in a blast oven at 80°C for 10 h, and mica (2000 mesh) was dried in a blast oven at 110°C for 6 h.

...

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Abstract

The invention relates to a preparation method of a fully-biodegradable composition. The fully-biodegradable composition is prepared from the following components in parts by weight: 80-100 parts of polylactic acid, 0-20 parts of biodegradable polyester, 5-20 parts of flexibilizer, 0-20 parts of filler, 0.1-1 part of lubricant and 0.1-0.6 part of antioxidant. The preparation method of the fully-biodegradable composition comprises the following steps of: (1), drying polylactic acid, the biodegradable polyester and the filler; (2), weighing the components in parts by weight, adding the components to a high-speed mixer and mixing for 5 minutes to 10 minutes at high speed under normal temperature; and (3), adding the uniformly mixed materials to a double-screw extruder for melting, blending, extruding and pelletizing to obtain the needed fully-biodegradable composition. Compared with the prior art, the fully-biodegradable composition disclosed by the invention is not only good in processing performance, but also good in flexibility, and therefore, the prepared composition can be used for blow-molding and film-forming. Moreover, the adopted flexibilizer has a polylactic acid chain section, is good in compatibility with the polyactic acid substrate and capable of preventing the modifier from permeating.

Description

technical field [0001] The invention relates to a material and a method in the technical field of polymer materials, in particular to a fully biodegradable composition and a preparation method thereof. Background technique [0002] With the rapid development of the national economy, the use of polymer materials has penetrated into all areas of people's lives, bringing great convenience to our lives, especially plastic film materials, which are widely used. However, traditional plastic film materials are mainly prepared from petroleum-based materials, such as polypropylene and polyethylene. Thin film materials made of such materials are difficult to degrade when discarded in nature after use, leading to serious environmental pollution problems. With the increasing shortage of petroleum resources, people's high attention to environmental issues and the improvement of life quality requirements, the development of fully biodegradable polymer materials has become a research hots...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L67/08C08G63/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29B7/007B29B7/48B29B9/06B29B9/12B29B7/90B29B7/826B29B7/726C08J3/203
Inventor 袁角亮杨斌王新灵
Owner WEIHAI LIANGAN ENVIRONMENTAL PROTECTION NEW MATERIAL TECH CO LTD
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