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Disposable controlled completely-degradable plastic packing bag and preparation method thereof

A completely degradable and packaging bag technology, applied in the field of disposable controllable and completely degradable plastic packaging bags and their preparation, can solve the problems of film mechanical properties, physical and mechanical properties, material mechanical properties, etc., and achieve later use performance. Good uniformity, avoiding the decline of mechanical properties, and the effect of good mechanical properties

Inactive Publication Date: 2012-06-20
NINGXIA GREEN BIODEGRADABLE PROD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it still has some problems: 1) due to the excessive amount of plasticizer added (at least 24wt%, up to 38wt%), it is inevitable that this type of film will produce plasticizer on the film surface after standing for a period of time. The problem of precipitation, on the one hand, it will reduce the mechanical properties of the film in the later stage and affect the performance. On the other hand, the chemical reagents precipitated will inevitably pollute the packaged objects, and at the same time increase the cost
2) Because the amount of starch added is not high (only 8.17-38wt%), it will not only make the cost of the obtained film still high, but also affect the degradation rate of the film to a certain extent
3) Due to the added ZnO / SiO 2 The preparation process of composite powder is very complicated, the cycle is long and the chemical reagents used are large, which will undoubtedly affect the production capacity of the film and increase the cost to a certain extent.
[0006] Other studies have shown (Wang Yunfang et al., Progress in Research on Starch-Based Environmentally Degradable Polymer Materials [J], Materials Herald, 2005, 4:12-15), while starch can improve the degradability of plastics, on the one hand it will cause its physical degradation. The decline in mechanical properties makes it difficult to process. On the other hand, it is too hydrophilic and has poor compatibility with most general-purpose resins, resulting in a significant decline in the mechanical properties of the material, thus hindering the industrialization of starch plastics. Wide application in the promotion process
Therefore, in order to ensure the end-use performance of starch-based plastic products, the general solution is to reduce the amount of starch added, but this will bring about higher product costs and slower degradation.

Method used

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  • Disposable controlled completely-degradable plastic packing bag and preparation method thereof
  • Disposable controlled completely-degradable plastic packing bag and preparation method thereof
  • Disposable controlled completely-degradable plastic packing bag and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] First put 50 parts of nano-cerium oxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir for 20 minutes at 4000 rpm, during which 1 part of γ-aminopropylmethyldiethoxysilane and no The mixed solution of 80 parts of water and ethanol was added in 3 times. After the addition, continue to stir and mix at a high speed for 1.5 hours, then filter with suction, dry the powder at 120°C, and put it into a ball mill for grinding for at least 1 hour.

[0052] 0.2 parts of the obtained surface-modified nano additives and 5 parts of polyoxyethylene polyoxypropylene ether block copolymers with a relative molecular weight of 1000 g / mol, 5 parts of triethyl citrate and acetyl tri-n-butyl citrate 10 parts of ester, 5 parts of water, 10 parts of glycerin, 5 parts of polyethylene glycol with a relative molecular weight of 400g / mol were dispersed for 2 hours by a colloid mill, and then mixed with 75 parts of cornstarch, 15 parts of polyvinyl alcohol of 1799, bis( Pu...

Embodiment 2

[0055] First put 30 parts of anatase-type nano-titanium dioxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir for 30 minutes at 3000 rpm, during which 0.5 parts of γ-aminopropylmethyldiethoxy Add the mixture of 50 parts of silane and absolute ethanol in 3 times. After the addition, continue to stir and mix at ultra-high speed for 2 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.

[0056] 1 part of the obtained surface-modified nano-auxiliary and 15 parts of acetyl tri-n-butyl citrate were dispersed through a colloid mill for 1 hour, and then mixed with 40 parts of rice starch, 40 parts of mung bean starch, and 10 parts of polyvinyl alcohol of 1799 , 1 part of 2,6-tertiary butyl-4-methylphenol antioxidant is put into a high-speed mixer, stirred at a temperature of 70°C and a speed of 120 rpm for 20 minutes, discharged, and then added to twin-screw extrusion It can be melt extruded...

Embodiment 3

[0059] First put 40 parts of anatase-type nano-titanium dioxide with a particle size of 30-50nm and 10 parts of nano-cerium oxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir at 5000 rpm for 10 minutes, during which 1.5 parts of γ - The mixture of aminopropylmethyldiethoxysilane and 100 parts of absolute ethanol was added in 3 times. After the addition, continue to stir and mix at a high speed for 1.5 hours, then filter with suction, dry the powder at 110°C, and then Put into a ball mill and grind for at least 1 hour.

[0060] 1.5 parts of nano additives after the surface modification obtained and 5 parts of polyoxyethylene polyoxypropylene ether block copolymers and 10 parts of acetyl tri-n-butyl citrate with a relative molecular weight of 1500 g / mol were dispersed by a colloid mill for 2 hour, then with 30 parts of lotus root starch, 42 parts of potato starch, 20 parts of polyvinyl alcohol of 1799, 5 parts of polyvinyl alcohol of 2499, 1 part of 2...

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Abstract

The invention discloses a disposable controlled completely-degradable plastic packing bag, which is formed through melting, blending, extruding and film-blowing of components comprising in parts by weight: 20 to 45 parts of polyvinyl alcohol, 72 to 87 parts of starch, 10 to 20 parts of micromolecule plasticizer, 0.2 to 2 parts of modified inorganic nanometer additive, 0.1 to 1.5 parts of antioxidant, 0.5 to 3 parts of compatibilizer, 8 to 15 parts of inorganic filler, 0.1 to 1 part of ultraviolet absorber, and 0.1 to 1 part of pigment. The invention further discloses a preparation method of the plastic packing bag. The nanometer composite modifier in the packing bag adopts a micromolecule plasticizer easy to form a hydrogen bond with the starch, a certain amount of inorganic nanometer additives subject to surface treatment are added in the packing bag, so that after PVA (polyvinyl acetate) is modified by the nanometer composite modifier, the use amount of the molecule plasticizers is reduced greatly, the cost is lowed, the reduction of the mechanical property of a film is avoided, and the controlled completely-degradable film with excellent mechanical property and the use performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of plastic packaging bags and their preparation, in particular to a disposable controllable and completely degradable plastic packaging bag and a preparation method thereof. Background technique [0002] Currently commonly used polyethylene (PE) and polypropylene (PP) plastic packaging bags are widely used in people's daily life because of their light weight, low price, and convenient use. However, while it enriches and facilitates people's lives, it causes serious "white pollution" problems because its main components are difficult to decompose in the natural environment. With the sustainable development of the society, the ecological environment problem has been raised to the height of the development strategy by the governments of various countries, and the research and development of fully biodegradable plastics is an important way to solve the "white pollution" problem caused by plastic packaging bag wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08K13/06C08K9/06C08K3/22C08K5/11B65D30/02B65D65/46B29C49/04B29B9/12B29B7/00
CPCY02W90/10
Inventor 杨建军侯世荣郭刚
Owner NINGXIA GREEN BIODEGRADABLE PROD
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