Biodegradable preservative film and preparation method thereof

A biodegradable and fresh-keeping film technology, which is applied in the field of biodegradable fresh-keeping film and its preparation, can solve the problems of reduced material degradability, limited application, short antibacterial period, etc., to improve dispersion and interface bonding, and increase strength and ductility, the effect of improving surface compatibility

Active Publication Date: 2019-03-01
广东巨塑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN102408690A discloses a thermoplastic starch-modified polylactic acid material, which forms a blend system of starch and polylactic acid through simple direct blending, but the starch and polylactic acid are incompatible, and the interfacial cohesion of the blend system is poor. The physical and mechanical properties such as toughness and plasticity of the product are reduced; Chinese patent CN101831155A discloses a method for preparing a starch/polylactic acid blend. application in food packaging and tableware; and for example, Chinese patent CN101781448A discloses a preparation method of a fully biodegradable reinforced polylactic acid/starch blend, which improves the blend by adding a thermoplastic elastic toughening agent. Mechanical and heat resistance properties, but the thermoplastic elastic toughening agent used is liquid rubber or thermoplastic elastomer, which is a non-biodegradable component, which affects the complete degradability of the blend
Therefore...

Method used

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  • Biodegradable preservative film and preparation method thereof
  • Biodegradable preservative film and preparation method thereof
  • Biodegradable preservative film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preservative film of the present embodiment, the preparation method is as follows (the following components are all in parts by weight):

[0035] Step a. At 20°C, mix 50 parts of tapioca starch with 50 parts of distilled water and stir evenly, then add 4 parts of glycerin and 0.6 parts of maleic anhydride, and keep stirring to form a colloidal mixture; then place it in a water bath or Heat gelatinization in an oil bath at a heating temperature of 95°C for 25 minutes to obtain a viscous colloid; place the viscous colloid in an oven at a drying temperature of 100°C for 15 minutes, then dry The solid was crushed to 200 mesh to obtain modified starch.

[0036] Step b, weighing 20 parts of modified starch, 50 parts of PBAT, 25 parts of polylactic acid, 3 parts of biodegradable aliphatic-aromatic copolyester, 5 parts of methyl hydroxypropyl cellulose ether and 5 parts of nano talcum powder (the average particle size is 50nm), dry at 75°C for 4 hours, so that the mo...

Embodiment 2

[0042] A kind of preservative film of the present embodiment, the preparation method is as follows (the following components are all in parts by weight):

[0043] Step a. At 22°C, mix 45 parts of tapioca starch with 55 parts of distilled water and stir evenly, then add 2 parts of glycerin and 0.4 parts of maleic anhydride, and keep stirring to form a colloidal mixture; then place it in a water bath or Heat gelatinization in an oil bath at a heating temperature of 85°C for 30 minutes to obtain a viscous colloid; place the viscous colloid in an oven at a drying temperature of 110°C for 20 minutes, then dry The solid was crushed to 100 mesh to obtain modified starch.

[0044] Step b, weigh 15 parts of modified starch, 60 parts of PBAT, 35 parts of polylactic acid, 5 parts of polyethylene terephthalate-co-adipate, 3 parts of methyl hydroxypropyl cellulose ether and 6 parts of nano talcum powder (average particle diameter is 70nm), dry at 78 ℃ for 5h, make the water content of eac...

Embodiment 3

[0050] A kind of preservative film of the present embodiment, the preparation method is as follows (the following components are all in parts by weight):

[0051] Step a. At 25°C, mix 60 parts of tapioca starch with 45 parts of distilled water and stir evenly, then add 8 parts of glycerin and 1 part of maleic anhydride, and keep stirring to form a colloidal mixture; then place it in a water bath or Heat gelatinization in an oil bath at a heating temperature of 100°C for 10 minutes to obtain viscous colloids; place the viscous colloids in an oven at a drying temperature of 120°C for 10 minutes, then dry The solid was crushed to 230 mesh to obtain modified starch.

[0052] Step b, weighing 25 parts of modified starch, 56 parts of PBAT, 30 parts of polylactic acid, 10 parts of biodegradable aliphatic-aromatic copolyester, 10 parts of methyl hydroxypropyl cellulose ether and 8 parts of nano talcum powder (the average particle size is 60nm), dry at 80°C for 4.5h, make the moisture...

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Abstract

The invention relates to the technical field of biodegradable polymeric materials, in particular to a biodegradable preservative film and a preparation method thereof. The biodegradable preservative film is mainly prepared from the following raw materials in parts by weight: 50-65 parts of PBAT, 15-30 parts of modified starch, 20-40 parts of polylactic acid, 3-10 parts of a biodegradable aliphatic-aromatic copolyester, 3-10 parts of hydroxypropyl methyl cellulose ether, 2-8 parts of nano talcum powder, 0.1-0.5 part of a chain extender, 0.2-0.8 part of an antioxidant, and 0.2-0.6 part of a lubricant. Through the synergistic effect of all the components, the cost is lowered greatly while tenacity, plasticity, strength and degradability of a preservative film product are improved, and thus scale production and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a biodegradable plastic wrap and a preparation method thereof. Background technique [0002] With the continuous development of my country's economy, the demand for packaging materials such as plastic wrap is also increasing. Traditional cling film materials are mainly derived from petroleum-based materials such as polyethylene (PE), which are difficult to dispose of after they are discarded. If it is disposed of by incineration, a large amount of toxic by-products will be produced; if it is disposed of by landfill, the degradation cycle of traditional petroleum-based materials is very long, and some even exceed 100 years, which will bring serious "white pollution" "question. Therefore, environmentally friendly biodegradable materials are currently a research hotspot. [0003] Polylactic acid (PLA), a thermoplastic biodegradable material with high stren...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L67/00C08L1/28C08L3/02C08K13/02C08K3/34C08K5/00C08J5/18
CPCC08J5/18C08J2367/02C08J2401/28C08J2403/02C08J2467/04C08J2467/00C08K5/0058C08K3/34C08K13/02C08K2201/011
Inventor 魏志国梁世丰
Owner 广东巨塑科技有限公司
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