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A kind of degradable polylactic acid composite material used for environment-friendly tableware and its preparation method

A technology of composite materials and polylactic acid, which is applied in the fields of plant fiber, fiber treatment, textiles and papermaking, etc., can solve environmental pressure and other problems, and achieve the effects of reduced pollution, high safety and cost reduction

Active Publication Date: 2021-05-14
浙江金晟环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings and deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide an environmentally friendly and degradable polylactic acid composite material, in order to solve the environmental protection pressure problem existing in the existing strong chemical treatment such as acid-base treatment, and to provide a kind of toughness Higher materials, in order to meet the needs of disposable tableware that do not require high heat resistance but have high requirements for toughness

Method used

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  • A kind of degradable polylactic acid composite material used for environment-friendly tableware and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of preparation method of degradable polylactic acid composite material for environment-friendly tableware, operate according to the following steps:

[0049] (1) Pretreatment of fiber materials:

[0050] (1.1) Fiber treated with acetic anhydride

[0051] The plant fiber was added to acetic anhydride and stirred at 180°C for 3 hours with a magnetic stirrer. The amount of acetic anhydride was 80% relative to the mass of the plant fiber. After precipitation, the treated plant fiber was filtered and washed repeatedly with distilled water until neutral. Dry in a drying oven at 50°C, weigh until the mass difference between the two times is less than 0.2 mg, and seal and store for later use.

[0052] (1.2) Silane coupling agent treated fibers

[0053] Add the plant fiber obtained in step (1.1) to the solution prepared by the silane coupling agent (1% of the silane coupling agent, 70% of anhydrous ethanol and 29% of distilled water, adjust the pH of the solution to 4.0...

Embodiment 2

[0058] A kind of preparation method of degradable polylactic acid composite material for environment-friendly tableware, operate according to the following steps:

[0059] (1) Pretreatment of fiber materials:

[0060] (1.1) Fiber treated with acetic anhydride

[0061] The fibers were added to acetic anhydride (the amount of acetic anhydride relative to the mass of the plant fibers was 300%) and stirred with a magnetic stirrer at 220 ° C for 1 h. After precipitation, the fibers were filtered to obtain the treated fibers, washed repeatedly with distilled water until neutral, and dried at a constant temperature. Dry at 80°C in a box, weigh until the mass difference between two times is less than 0.2 mg, and store in a sealed container for later use.

[0062] (1.2) Silane coupling agent treated fibers

[0063] Add the fiber obtained in step (1.1) to the solution prepared by the silane coupling agent (5% of the silane coupling agent, 70% of anhydrous ethanol and 25% of distilled ...

Embodiment 3

[0068] A kind of preparation method of degradable polylactic acid composite material for environment-friendly tableware, operate according to the following steps:

[0069] (1) Pretreatment of fiber materials:

[0070] (1.1) Fiber treated with acetic anhydride

[0071] Add the fibers into acetic anhydride (the amount of acetic anhydride relative to the mass of the plant fibers is 200) and stir with a magnetic stirrer at 200 ° C for 2 hours. After precipitation, the fibers are filtered to obtain the treated fibers, and repeatedly washed with distilled water until neutral. Dry at 65°C, weigh until the mass difference between two times is less than 0.2 mg, and store in a sealed container for later use.

[0072] (1.2) Silane coupling agent treated fibers

[0073] Add the fiber obtained in step (1.1) to the solution prepared by silane coupling agent (3% of silane coupling agent, 70% of absolute ethanol and 27% of distilled water, adjust the pH of the solution to 4.0 with HCl), the...

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Abstract

The invention belongs to the field of polylactic acid composite material and its preparation, and relates to a degradable polylactic acid composite material used for environment-friendly tableware, which is made of the following raw materials in weight percentage: polylactic acid 45%-65%, plant fiber 30%-40 % and 5%-15% of glycerin, wherein the plant fiber is used after combined treatment with acetic anhydride and silane coupling agent, the amount of acetic anhydride is 80-300% relative to the quality of plant fiber, and the amount of silane coupling agent is 80-300% relative to the quality of plant fiber 1‑5% by mass. Compared with the alkali-treated polylactic acid composite material, the invention can greatly enhance the biodegradation speed of the material without affecting the performance of the material, and the preparation method is more environmentally friendly.

Description

technical field [0001] The invention belongs to the field of polylactic acid composite material and its preparation, and relates to a degradable polylactic acid composite material used for environmental protection tableware and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, people pay more and more attention to environmental pollution and food safety. However, the increasing scarcity of petroleum resources and its unfriendliness to the environment limit the extensive use of petroleum-based plastic materials, which makes the use of renewable and degradable resources to produce biodegradable materials to become a material development trend. Among the many degradable materials, polylactic acid (PLA) stands out in the disposable packaging industry with its excellent biocompatibility and biodegradability. [0003] At present, in daily life, except for disposable products such as fast food boxes, which have higher req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/02C08K5/053D06M13/188D06M13/513D06M101/04
CPCC08L67/04C08L2201/06C08L2205/16D06M13/188D06M13/5135D06M2101/04C08L97/02C08K5/053
Inventor 付永前张平胡嘉欢
Owner 浙江金晟环保股份有限公司
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