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Modified polylactic acid material and preparation method and application thereof

A modified material, polylactic acid technology, used in flexible coverings, transportation and packaging, climate sustainability, etc., can solve the problems of plasticizer volatilization, insufficient exudation inhibition, thick thickness, and easy brittle cracking. Achieve the effect of reducing white pollution, simple preparation process and improving flexibility

Inactive Publication Date: 2011-01-26
江苏天仁生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology makes the softness of the composition reach a practical level, it does not sufficiently inhibit the volatilization, seepage and loss of the plasticizer
[0006] In addition, in the Chinese invention patent CN1962244A, a production method of polylactic acid biaxially stretched film is disclosed. The disadvantage of this formed film is that it is thick and brittle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 70 parts of polylactic acid with a molecular weight of 225,000, 10 parts of German Bayer thermoplastic polyurethane UT7-85A1010 parts, 10 parts of acetyl tributyl citrate, and 10 parts of ordinary corn starch were mixed in a high-speed mixer at room temperature for 5 to 10 minutes and then added to the twin-screw The polylactic acid modified granular material is obtained by melt blending, drawing, water cooling and pelletizing in the extruder. After the mechanical performance test: the tensile strength is 52.0Mpa, and the elongation at break is 121.3%.

Embodiment 2

[0043] 60 parts of polylactic acid with a molecular weight of 225,000, 10 parts of German Bayer thermoplastic polyurethane UT7-85A1010 parts, 10 parts of epoxy soybean oil, and 20 parts of thermoplastic starch were mixed in a high-speed mixer at room temperature for 5 minutes and added to a twin-screw extruder for melting Mixing, drawing, water cooling, and pelletizing to obtain polylactic acid modified granular materials. After the mechanical performance test: the tensile strength is 48.2Mpa, and the elongation at break is 98.6%.

Embodiment 3

[0045] 50 parts of polylactic acid with a molecular weight of 225,000, 10 parts of German Bayer thermoplastic polyurethane UT7-85A1010 parts, 20 parts of propylene glycol adipate, and 20 parts of talcum powder were mixed by a high-speed mixer at room temperature for 10 minutes and then added to the twin-screw extruder Melt blending, drawing, water cooling, and pelletizing to obtain polylactic acid modified granular materials. After the mechanical performance test: the tensile strength is 42.1Mpa, and the elongation at break is 188.4%.

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Abstract

The invention provides a modified polylactic acid material and a preparation method and application thereof. The modified polylactic acid material comprises the following raw materials in part by weight: 40 to 70 parts of polylactic acid, 10 to 20 parts of thermoplastic polyester elastomer, 10 to 20 parts of plasticizer and 10 to 20 parts of organic or inorganic filler, wherein the thermoplastic polyester elastomer is polyester thermoplastic polyurethane; the plasticizer is one or two of tributyl acetocitrate, epoxidized soybean oil, propylene glycol polyester adipate or dioctyl maleate; and the organic or inorganic filler is one or more of starch, talcum powder, calcium carbonate, mica, montmorillonite, clay or titanium dioxide. The modified polylactic acid material has the advantages of improving the flexibility of a polylactic acid material and reducing the cost of a biodegradable material. A mechanical performance test shows that in the modified polylactic acid material, the tensile strength is 15 to 70 MPa and the fracture tensile rate is 20 to 38 percent.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polylactic acid modified material and its preparation method and application. Background technique [0002] Materials such as packaging film bags, plastic wrap bags, disposable film bags (such as garbage bags, tablecloths, and sanitary bags), agricultural films (mulch film, covering film, shed film) and blister sheets used in human daily life are more and more expensive. There are more and more plastics, most of which are petroleum-based plastics. Although they are cheap, they have poor degradation performance and become a source of pollution that damages the environment after use. [0003] Japanese Patent Application No. 9-272794 discloses a film obtained by mixing polylactic acid polymers with other aliphatic polyesters in a weight ratio of 75:25 to 20:80. It has a tensile modulus of 250Kg / mm 2 A biodegradable film with light transmittance above 65%. But, adopt th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06C08K13/02B65D65/38A01G13/02
CPCY02W90/10
Inventor 邹俊
Owner 江苏天仁生物材料有限公司
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