Starch-based degradable bioplastic and preparation method thereof
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A bioplastic and starch-based technology, applied in the field of degradable bioplastics, can solve problems such as poor descriptive properties, decreased mechanical strength, and poor results
Inactive Publication Date: 2017-07-04
HEILONGJIANG XINDA ENTERPRISE GRP
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Problems solved by technology
The description between the two is very poor, and the mechanical strength is greatly reduced after blending. In order to increase the compatibility, scientists have used many methods: such as silanizing starch or treating it with isocyanate, or grafting a layer of acrylic acid on starch. ester or vinyl acetate, but these methods are somewhat expensive and somewhat ineffective, and the hydrophobicity of the modified starch is still insufficient
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Embodiment 1
[0018] 6kg of polypropylene, 1.5kg of highly hydrophobic potato starch, 200g of hydrogenated oil, 10g of manganese stearate, 200g of paraffin, 50g of stearic acid, 30g of borax, and 1.5kg of talcum powder were put into a high-speed mixer and stirred for 20 minutes, then added to double In a screw extruder, a 2.5mm masterbatch is made. Use this masterbatch to make lunch box through injection molding machine. This product contains 15.7% of highly hydrophobic starch material and has strong hardness. After two weeks of burying in moist soil, most of the surface was moldy.
Embodiment 2
[0020] High-density polyethylene 8.5kg, high hydrophobicity wheat starch 1.5kg, rapeseed oil 200g, stearic acid 10g, manganese naphthenate 10g, after putting into the high-speed mixer and stirring for 30min, join in the twin-screw extruder, 180 ℃ extrusion granulation, air-cooled hot cut into 2mm granules. The pellets were blown into a 25 µm thick film. After testing, its longitudinal tensile strength is 16MPa, the longitudinal elongation at break is 140%, the transverse tensile strength is 13MPa, and the transverse elongation at break is 530%. After two weeks in moist soil, the area of mold spots accounted for 48% of the total area, and after six months, only some small fragments remained.
Embodiment 3
[0022] 2kg of polystyrene, 800g of highly hydrophobic rice starch, 200g of refined soybean oil, 20g of lecithin, 50g of perbenzoic acid, and 5g of iron naphthenate were put into a high-speed mixer and stirred for 30 minutes before being added to a twin-screw extruder. Made of 2.5mm masterbatch. Use this masterbatch to make dinner plates through an injection molding machine. This product was buried in moist soil, and after two weeks, most of the surface was covered with mildew, and after eight months, it was broken, and the fragments were gray-black. In addition, the plate placed outdoors for eight months is gray in color, shattered at the touch of a touch, and basically has no mechanical strength.
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Abstract
The invention relates to a starch-based degradable bioplastic and a preparation method thereof. The objective of the invention is mainly to overcomes the disadvantages of proneness to production of plastic garbage and pollution to environment of general-purpose plastics in the prior art and the disadvantage of high price of biodegradable plastics in the prior art. The starch-based degradable bioplastic is characterized by comprising a high-hydrophobicity starchy material, aliphatic acid, a nucleating agent, a modifier, an oxidation promoter and the like. The preparation method comprises the following steps: mixing the above-mentioned components, a high polymer material and other auxiliary materials with a mixer; then adding a mixture obtained in the previous step into a double-screw extruder; carrying out mixing, plasticization and granulation in the double-screw extruder; and carrying out blow molding, calendaring, vacuum molding and the like so as to obtain the starch-based degradable bioplastic or a film. The starch-based degradable bioplastic is free of toxicity and applicable to agricultural films, food packaging materials, disposable plastic products for daily life, etc. The starch-based degradable bioplastic can be degraded by light, water and microbes in natural environment, so the problem of environmental pollution caused by waste general-purpose plastics in the prior art is overcome.
Description
technical field [0001] The invention belongs to the field of degradable bioplastics, and relates to the preparation of degradable bioplastics by using starch, modifiers and oxidation accelerators. Background technique [0002] Existing plastic products are widely used because they are economical, practical, and easy to process. However, due to their own nature, traditional general-purpose polymer materials are difficult to be degraded by microorganisms, that is, they will not rot and mildew, which will lead to long-term retention in existing life. . Therefore, the pollution problem of plastic garbage bags is becoming more and more serious, which has attracted widespread attention all over the world. [0003] Add a certain proportion of natural polymer materials that can be degraded by microorganisms, such as starch, cellulose, protein, chitin, etc., to the existing general-purpose polymer materials that cannot be degraded by microorganisms. degraded by microorganisms. How...
Claims
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