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A kind of starch-based degradable bioplastic and preparation method thereof

A bioplastic, starch-based technology, applied in the field of starch-based degradable bioplastics and its preparation, can solve the problems of insufficient starch hydrophobicity, pollution of plastic garbage bags, and decreased mechanical strength, etc., and achieves improved hydrophobic performance, low investment, and easy access. control effect

Inactive Publication Date: 2017-11-24
HEILONGJIANG XINDA ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional general-purpose polymer materials are difficult to be degraded by microorganisms due to their nature, that is, they will not rot and mildew, and then they will remain in the existing life for a long time. Therefore, the problem of plastic garbage bag pollution is becoming more and more serious, causing widespread worldwide At present, there are existing general-purpose polymer materials that cannot be degraded by microorganisms, which are prepared by adding a certain proportion of natural polymer materials that can be degraded by microorganisms, such as starch, cellulose, protein, chitin, etc. The product can be degraded by microorganisms, but this kind of natural polymer materials are highly hydrophilic, while common general-purpose polymer materials are highly hydrophobic, the compatibility between the two is very poor, and the mechanical strength after blending Greatly reduced, in order to enhance compatibility, scientists have used many methods, such as silanizing starch or treating with isocyanate, or grafting a layer of acrylate or vinyl acetate on starch, but these methods are a bit expensive and have a little effect Poor, the hydrophobicity of the modified starch is still insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of described starch-based degradable bioplastics comprises the following steps:

[0018] Dry 100 kg of corn starch in a drying oven at 100 °C for 4 h, then weigh 40 kg of the dried starch and add it to a mixer, stirring at 2500 r / min. When the starch temperature is 80 °C, change The dibenzoyl peroxide solution of the modifier is injected into a high mixer through a syringe and mixed with the starch. The amount of the modifier dibenzoyl peroxide solution is 0.2 kg, and after stirring for 30 min, 0.08 kg of nano-silica particles are added. Continue to stir for 10min to obtain highly hydrophobic starchy material, then the saturated triglyceride of 5kg and natural vegetable oil mixture, the zinc stearate of 5kg are mixed, make masterbatch with twin-screw extruder, masterbatch and 50kg After the polypropylene is mixed, injection molding, edge pressing, blow molding, and air molding are made into starch-based biodegradable bioplastics.

Embodiment 2

[0020] The preparation method of described starch-based degradable bioplastics comprises the following steps:

[0021] Dry 100 kg of sorghum starch in a drying oven at 110 °C for 4 h, then weigh 50 kg of the dried starch and add it to a mixer, stirring at 2700 r / min. When the starch temperature is 90 °C, change the The peroxybenzoic acid solution of the modifier is injected into the high mixer through a syringe and mixed with the starch. The dosage of the modifier peroxybenzoic acid solution is 0.25 kg. After stirring for 30 min, add 0.1 kg of nano-silica particles and continue stirring for 10 min. Obtain highly hydrophobic starchy material, then the unsaturated triglyceride of 5kg and natural vegetable oil mixture, the manganese stearate of 5kg are mixed, make master batch with twin-screw extruder, master batch and 40kg polyphenylene After ethylene is mixed, injection molding, edge pressing, blow molding, and air molding are made into starch-based degradable bioplastics.

Embodiment 3

[0023] The preparation method of described starch-based degradable bioplastics comprises the following steps:

[0024] 100kg of potato starch was first dried in a drying oven at 120°C for 4 h, then 35kg of the dried starch was weighed and added to a mixer, and stirred at 3000 r / min. When the starch temperature was 100°C, change The neutralizing agent cumene hydrogen peroxide solution is injected into a high mixer through a syringe and mixed with the starch. The amount of the modifying agent cumene hydrogen peroxide solution is 0.175 kg. After stirring for 30 min, add 0.07 kg of nano-silica particles. Continue to stir for 10min to obtain highly hydrophobic starchy material, then the monoglyceride and triglyceride mixture of 2.5 unsaturated fatty acids, the oleate of zinc of 2.5kg are mixed, make masterbatch with twin-screw extruder, will After the masterbatch is mixed with 60kg of polyvinyl chloride, the starch-based biodegradable bioplastic is made by injection molding, edge p...

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PUM

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Abstract

The invention relates to starch-base degradable bioplastic and a preparing method thereof, and belongs to the technical field of biodegradable materials. The starch-base degradable bioplastic is prepared from 40-85% of commodity polymer plastic, 10-50% of a high-hydrophobicity starchiness material, 0.5-5% of aliphatic polyester and 0.1-5.5% of oxidation accelerator. The preparing method of the starch-base degradable bioplastic includes the following steps that starch is treated in a hydrophobization mode to obtain the high-hydrophobicity starchiness material, the raw material components are mixed by a ratio and prepared into master batch through a twin-screw extrusion machine, and after the master batch and the commodity polymer plastic are mixed, the starch-base degradable bioplastic is prepared through injection molding, flattening, blow molding, vacuumizing and forming. The product prepared through the method can be used repeatedly on the dry condition without perpendicular sunlight incidence, the strength is kept unchanged basically, an abandoned product is completely decomposed finally in wet soil, no harmful component is generated, and the environment is not polluted.

Description

technical field [0001] The invention relates to a starch-based degradable bioplastic and a preparation method thereof, belonging to the technical field of biodegradable materials. Background technique [0002] As a synthetic polymer material, plastic is widely used in home appliances, automobiles, etc. , furniture, packaging supplies, agricultural film and many other aspects, the extensive use of plastics has produced many disposable plastic wastes that cannot be recycled, resulting in increasingly serious "white pollution", such as groundwater pollution and soil pollution, animal and plant resources It is destroyed and seriously threatens the survival and health of human beings. Starch plastics, also known as starch-based plastics, generally refer to plastics whose composition contains starch or its derivatives. Plastics with natural starch as filler and plastics with natural starch or its derivatives as the main component of the blend system belong to this category. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08L91/00C08L23/12C08L25/06C08L27/06C08K13/02C08K5/14C08K3/36C08K5/103C08K5/098
CPCC08K2201/011C08L3/02C08L2201/06C08L2205/03C08L91/00C08L23/12C08K13/02C08K5/14C08K3/36C08K5/103C08K5/098C08L25/06C08L27/06
Inventor 马海清刘刚林航
Owner HEILONGJIANG XINDA ENTERPRISE GRP
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