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Preparation method for controllable biodegradable material

A technology of biodegradable materials and starch raw materials, which is applied in the field of preparation of biodegradable materials that can control the degradation rate, can solve problems that have not been involved, achieve strong penetration, facilitate degradation rate and material mechanical properties, control degradation rate and material The effect of mechanical properties

Active Publication Date: 2014-07-30
赵永富
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above techniques

Method used

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  • Preparation method for controllable biodegradable material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 100g of cornstarch, pass through a 40-mesh sieve after drying, the irradiation dose is 3kGy, and the product dosage unevenness is U=1.3; 5g of fatty acid, 30g of polylactic acid, 1g of each sensitizer and accelerator, fully stirred, and mixed evenly; then put the above-mentioned mixed sample in an aluminum foil bag, vacuum-packed and then irradiated, the dose was 5 kGy, the product dose Unevenness U=1.3; the irradiated miscible material is extruded and granulated to make a special material for full biodegradation. The material is made into a plastic film, and then irradiated with 10kGy, and then covered with a film in a vegetable greenhouse, and it will be completely degraded within 170 days.

Embodiment 2

[0028] Take 100g of cassava starch, pass through a 40-mesh sieve after drying, the irradiation dose is 8kGy, and the product dosage unevenness is U=1.25; Fatty acid 8g, polylactic acid 40g, sensitizer and accelerator each 2g, fully stirred, and mixed evenly; then the above mixed sample was placed in an aluminum foil bag, packed with nitrogen and then irradiated, the dose was 10kGy, the product dose Unevenness U=1.2; the irradiated miscible material is extruded and granulated to make a special material for full biodegradation. The material is made into a plastic film, and then irradiated with 40kGy, and the film is cultivated in the open air, and it will be completely degraded within 160 days.

Embodiment 3

[0030] Take 100g of sweet potato starch, pass through a 40-mesh sieve after drying, irradiate 10kGy, and the product dosage unevenness U=1.3; then add 5g of nano-sized silicon dioxide (or zinc dioxide) with a particle size of 50nm, 35g of polyvinyl alcohol, stearin Polylactic acid 10g, polylactic acid 60g, sensitizer and accelerator 5g each, fully stirred, and mixed evenly; then the above-mentioned mixed sample was placed in an aluminum foil bag, vacuum-packed and then irradiated. The dose was 15kGy, and the product dose was not uniform. The degree U=1.2; the irradiated miscible material is extruded and granulated to make a special material for full biodegradation. The material is made into a plastic film, and then irradiated with 100kGy, and then covered with a film in a vegetable greenhouse, and it will be completely degraded within 140 days.

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Abstract

The invention discloses a preparation method for a controllable biodegradable material. The preparation method is characterized by comprising the following steps of: 1) starch radiation modification; 2) mixing: adding a nanometre assistant, polyvinyl alcohol, stearic acid, polylactic acid, a radiation sensitizer and an accelerant in the treated modified starch, adequately stirring, and uniformly mixing; 3) radiation copolymerization: placing the mixed sample in an aluminium foil bag carrying out packaging and sealing treatment in a vacuum or by charging nitrogen, and then carrying out radiation treatment on the packaged sample; 4) granulation / membrane preparation: uniformly pouring the mixture subjected to radiation copolymerization in a double-screw double-exhaust extrusion granulator group or a double-screw double-exhaust extrusion pelletizer group, and carrying out extrusion granulation or pelletizing; 5) radiation degradation rate control: radiating the product obtained by granulation / membrane preparation while controlling the dosage to be 10-100 kGy and controlling the dosage non-uniformity U of the product to be not greater than 1.3. According to the preparation method disclosed by the invention, the problems of cumbersome process, high-temperature energy consumption, and inevitably-brought pollutant discharge of a common chemical method are overcome, and the object of controlling the decomposition rate is realized.

Description

technical field [0001] The invention relates to a production process of a biodegradable material, in particular to a method for preparing a biodegradable material with controllable degradation speed based on radiation and nanotechnology. Background technique [0002] The rapid development of petrochemical industry has provided people with excellent performance and cheap plastic products for daily life. However, the waste after plastic use is thrown into fields, rivers, mountains, streets and parks at will, causing "white pollution" and seriously affecting the human living environment. For this reason, countries have legislated to restrict the use of films and foamed plastics, and at the same time vigorously develop biodegradable plastic products. [0003] Starch has a wide range of sources and is cheap. It is a renewable biological resource that can be completely digested and utilized by microorganisms. Therefore, the development of starch-based biodegradable plastics has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J3/28C08L3/02C08L67/04C08L29/04C08K3/36C08K3/22
Inventor 不公告发明人
Owner 赵永富
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