Preparation method of biodegradable cast film

A casting film, biological technology, applied in the field of biodegradable casting film preparation, can solve the problems of uneven film thickness, difficult to control transparency, poor hand feeling, etc., achieve good heat resistance and impact performance, excellent The effect of biodegradability and broad application prospects

Pending Publication Date: 2022-04-08
湖北拓盈新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used polylactic acid degradable film mostly adopts blow molding film forming process, but this process has the defects of uneven film thickness, difficult to control transparency and poor heat sealability; the prepared polylactic acid degradable film still has high temperature resistance Poor performance, high hardness, poor hand feeling, complicated manufacturing process and relatively high cost
Polylactic acid is not suitable for casting film, and other polymers are usually added to improve its processing performance in production, but the compatibility of polylactic acid with other substances is poor, it is difficult to meet the requirements of the casting process, and it will affect The biodegradability of polylactic acid; these problems restrict the wide application and long-term development of degradable films in the market

Method used

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  • Preparation method of biodegradable cast film
  • Preparation method of biodegradable cast film
  • Preparation method of biodegradable cast film

Examples

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preparation example Construction

[0034] A preparation method of a biodegradable casting film, comprising the following steps:

[0035] S1. Composite material preparation

[0036]PLA (polylactic acid), PBAT (polyadipate / butylene terephthalate) and polyester chain extender are melt-blended to obtain a composite material; wherein, PLA and PBAT are based on (15%-85 %): (85% to 15%) for blending, and the chain extender accounts for 1% to 15% of the total mass of PLA and PBAT. The polyester chain extender is one of polyol, polyamine or multiple epoxy molecule chain extenders, and the range of functionality n of the chain extender is 2≤n≤4; the preferred functionality is 3 multiple epoxy molecules Compounds used as chain extenders include triglycidyl isocyanurate, glycerol triglycidyl ether, or trimethylolpropane triglycidyl ether. Polyol chain extenders include 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, diethylene glycol, triethylene glycol, neopentyl glycol and diethylaminoethanol; Chaining agents incl...

Embodiment 1

[0049] This embodiment provides a method for preparing a biodegradable cast film, comprising the following steps:

[0050] S1. Composite material preparation

[0051] PLA, PBAT and triglycidyl isocyanurate chain extender are carried out melt blending processing, obtain composite material; Wherein the ratio of PLA, PBAT is 70%: 30%, triglycidyl isocyanurate The ester chain extender accounts for 5% of the total mass of PLA and PBAT; during the melt blending process, the vacuum degree of the melt is kept less than -0.1MPa, the temperature is 200°C, and the time is 40min;

[0052] S2. Preparation of high fluidity biodegradable materials

[0053] Melt blend the composite material obtained in step S1 with the epoxy soybean oil dispersion lubricant at 160°C for 40 minutes to obtain a high fluidity biodegradable material; the epoxy soybean oil dispersion lubricant accounts for 1% of the composite material 2%;

[0054] S3. Preparation of biodegradable cast film

[0055] S31. Pour t...

Embodiment 2

[0062] This embodiment provides a method for preparing a biodegradable cast film. Compared with Example 1, the difference is that in step S1, the ratio of PLA and PBAT is 50%:50%, and the rest are roughly the same as those in the implementation. Example 1 is the same and will not be repeated here.

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Abstract

The invention provides a preparation method of a biodegradable cast film, which comprises the following steps: carrying out melt blending on PLA, PBAT and a polyester chain extender in proportion to obtain a composite material, carrying out melt blending on the composite material and a dispersion lubricant to obtain a high-fluidity biodegradable material, and carrying out a cast film forming process on the high-fluidity biodegradable material to obtain the biodegradable cast film. By controlling the blending ratio of PLA and PBAT, the variety and the addition amount of the polyester chain extender and regulating and controlling the flowability of the mixed material, the compatibility of PLA and PBAT is improved, the material reaches the casting grade, and the process conditions of melt blending and casting film forming are further limited, so that the production cost is reduced, and the production efficiency is improved. The finally prepared biodegradable cast film not only has excellent biodegradability, but also has better heat resistance and impact property, good ductility and elongation at break, and soft hand feeling; the preparation method is simple and easy to implement, free of adding of redundant modifiers, low in cost and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of degradable materials, in particular to a preparation method of a biodegradable casting film. Background technique [0002] Since its birth, plastics have quickly become the mainstay of various application materials due to their advantages such as light weight and easy molding, and plastic films account for the largest share in the plastics industry. Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins. Plastic film can be used in food packaging, electrical product packaging, daily necessities packaging, clothing packaging, chemical, pharmaceutical and other fields. There are many ways to form plastic films, such as calendering, casting, blow molding, stretching, etc. Compared with films produced by other methods, cast film has become the best among films because of its advantages such as fast production speed, high output, good transparency, good gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K5/3492C08K5/053C08K5/17C08J5/18
Inventor 朱志敏刘开宇赵青华许四华宋银红
Owner 湖北拓盈新材料有限公司
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