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Preparation method of polylactic acid plasticizing compound

A technology of polylactic acid and composites, which is applied in the field of preparation of polylactic acid plasticized composites, can solve the problem of high usage of plasticized polylactic acid, and achieve the effect of saving costs and enhancing technical function indicators

Active Publication Date: 2018-04-24
吉林省龙展新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of using a single plasticizer to plasticize polylactic acid, the present invention provides a preparation method of polylactic acid plasticized compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 A preparation method of polylactic acid plasticized compound

[0014] (1) The polylactic acid is dried in a vacuum oven at 80°C for 8 hours; the polylactic acid is semi-crystalline polylactic acid;

[0015] (2) 5 parts by weight of glycerin and 10 parts by weight of polyethylene glycol, the weight average molecular weight of which is 6000, are evenly mixed to prepare a compound plasticizer.

[0016] (3) Mixing and blending: Mix 15 parts by weight of the above-mentioned compound plasticizer with 85 parts by weight of polylactic acid at 180°C and a rotation speed of 40 rpm for 5 minutes with Haake mixer;

[0017] (4) Compression molding: Put the mixed materials in the mold, preheat at 170°C for 5 minutes, hot press for 5 minutes, the pressure is 10MPa; the pressure is 10MPa, and then cold press at room temperature for 3 minutes, A polylactic acid plasticized compound is obtained.

[0018] Tensile performance test: According to the GB / T1043-1979 test standard, ...

Embodiment 2

[0020] Example 2 A preparation method of polylactic acid plasticized compound

[0021] (1) Same as embodiment 1.

[0022] (2) 5 parts by weight of glycerin and 15 parts by weight of polyethylene glycol with a weight average molecular weight of 6000 are evenly mixed to prepare a compound plasticizer.

[0023] (3) Mixing and blending: 20 parts by weight of the compound plasticizer and 80 parts by weight of polylactic acid were blended for 5 minutes at 180 ° C and 40 rpm.

[0024] (4) Compression molding: Preheat at 190°C for 5 minutes, hot press for 5 minutes, and then cold press at room temperature for 3 minutes at a pressure of 10 MPa to obtain a polylactic acid plasticized compound.

[0025] The impact performance test and the tensile performance test are the same as in Example 1. The test results show that the tensile strength of the polylactic acid plasticized compound prepared by the present invention is 12.5 MPa, and the elongation at break is 227.2%.

Embodiment 3

[0026] Example 3 A preparation method of polylactic acid plasticized compound

[0027] (1) Same as embodiment 1.

[0028] (2) Mix 5 parts by weight of glycerin and 20 parts by weight of polyethylene glycol with a weight average molecular weight of 6000 to prepare a compound plasticizer.

[0029] (3) Mixing and blending: 25 parts by weight of the compound plasticizer and 75 parts by weight of polylactic acid were blended for 5 minutes at 180 ° C and 40 rpm.

[0030] (4) Compression molding: Preheat at 190°C for 5 minutes, hot press for 5 minutes, and then cold press at room temperature for 10 minutes at a pressure of 15 MPa, and press to obtain a polylactic acid plasticized compound.

[0031] The impact performance test and the tensile performance test are the same as in Example 1. The test results show that the tensile strength of the polylactic acid plasticized compound prepared by the present invention is 16.4MPa, and the elongation at break is 15.26%.

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Abstract

The invention provides a preparation method of a polylactic acid plasticizing compound. The polylactic acid plasticizing compound comprises the following components in parts by weight: 70-95 parts ofpolylactic acid and 5-30 parts of a compound plasticizer, and the compound plasticizer is composed of a component A and a component B, wherein the weight ratio of the component A to the component B is(1-5):(1-25). The component A is one or more with any proportion selected from glycerin of polyhydric alcohol, xylitol and sorbitol, and the component B is one or more with any proportion selected from dioctyl phthalate, polyethylene glycol with a molecular weight of 1000-8000, triethyl citrate, tributyl citrate, trioctyl citrate, triethyl acetyl citrate, tributyl acetyl citrate and trioctyl acetyl citrate. Compared with polylactic acid plasticized by a single plasticizer, the polylactic acid plasticized by the polylactic acid plasticizing compound has a tensile strength increased by 15.74% and an elongation at break increased by 11.05%, and meanwhile, the usage amount of the polylactic acid plasticizing compound is 41.67% lower than the usage amount of the single plasticizer.

Description

technical field [0001] The invention relates to a method for preparing a polylactic acid plasticized compound, which belongs to the field of polymer material processing. Background technique [0002] With the rapid development of science and technology, polymer materials have now become an indispensable material in people's lives. Renewable, biodegradable polylactic acid is considered to be one of the most promising alternatives to petroleum-based plastics. Polylactic acid has high transparency and gloss, good heat resistance, good biocompatibility and can be completely degraded into water and carbon dioxide. However, its disadvantages such as high brittleness, poor impact strength, lack of flexibility and elasticity, low melt strength, narrow processing temperature range, and high raw material cost limit the processing and use of polylactic acid. The best way to improve the use of polylactic acid is to improve the mechanical properties and processing properties of polylac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L71/02C08K5/053C08K5/11
CPCC08K5/053C08K5/11C08L67/04C08L71/02
Inventor 吴广峰吴文迪李明哲张会轩
Owner 吉林省龙展新材料科技有限公司
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