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Preparation method of modified starch biodegradable film

A technology of biodegradable film and starch, applied in the field of environmental science, can solve the problem of lack of ideal completely biodegradable materials, etc., and achieve the effects of high mechanical strength, good biodegradability, and good water resistance

Inactive Publication Date: 2016-09-28
陈建峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: most of the starch degradable materials produced in our country are incompletely degradable materials, and starch is only used as a filler or additive photodegradable plastic, and there is no ideal complete biodegradable material. Present situation provides a kind of preparation method of modified starch biodegradable film, the present invention is to take sweet potato starch as raw material, firstly epoxy polypropylene is used as crosslinking agent to carry out crosslinking, obtains crosslinked starch, then carries out with acetic anhydride Esterification to obtain cross-linked esterified starch, then add deionized water, reinforcing agent polyvinyl alcohol, water-resistant agent urea, cross-linking agent glyoxal and plasticizer glycerin to the cross-linked esterified starch, and cross-linked esterified starch After swelling, gelatinization, and cross-linking reactions, a substance with a certain viscosity is obtained, and then the substance is spread on a polyester sheet, dried, and then the film is removed to obtain a modified starch biodegradable film, which is prepared by the present invention. The film has good biodegradability, no pollution to the environment, good water resistance, high stability, and good water resistance and high mechanical strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, weigh 5g of sweet potato starch and add it to a three-necked flask with a thermometer and a reflux device. Place it in a water bath and control the temperature at 65°C. Add 200mL of deionized water and 2g of sodium chloride to the flask in turn, and magnetically stir for 5 minutes. After mixing uniformly, add 0.5mol / L sodium hydroxide solution to the flask to adjust the pH to 9.8, then add 0.2g epichlorohydrin to the flask, stir and react for 4h to obtain cross-linked starch; add to the above-mentioned cross-linked starch 0.1g acetic anhydride, control the temperature in a water bath at 75℃, stir the reaction for 2h, the reaction is over, add 38% acetic acid solution with mass concentration to the beaker, adjust the pH to 6.5, filter with suction to obtain the filter residue, and wash the filter residue with deionized water 3 Then, place it in an oven at 95℃ and dry for 1 hour to obtain cross-linked esterified starch; add the above-mentioned cross-linked esterified...

example 2

[0019] First, weigh 8g of sweet potato starch and add it to a three-necked flask with a thermometer and a reflux device, place it in a water bath, control the temperature at 70°C, add 250mL of deionized water and 3g of sodium chloride to the flask successively, and magnetically stir for 8min. After mixing uniformly, add 0.5mol / L sodium hydroxide solution to the flask to adjust the pH to 9.9, then add 0.3g epichlorohydrin to the flask, stir and react for 4.5h to obtain cross-linked starch; to the above-mentioned cross-linked starch Add 0.2g of acetic anhydride, control the temperature in the water bath at 80℃, stir and react for 2.5h. At the end of the reaction, add 38% acetic acid solution with mass concentration to the beaker, adjust the pH to 6.6, filter with suction to obtain the filter residue, and wash the filter residue with deionized water 4 times, place in a 100℃ oven and dry for 1.5 hours to obtain cross-linked esterified starch; add the above-mentioned cross-linked est...

example 3

[0022] First, weigh 10g of sweet potato starch and add it to a three-necked flask with a thermometer and a reflux device, place it in a water bath, control the temperature at 75°C, add 300mL of deionized water and 4g of sodium chloride to the flask in turn, and magnetically stir for 10min. After mixing uniformly, add 0.5mol / L sodium hydroxide solution to the flask to adjust the pH to 10.0, then add 0.4g epichlorohydrin to the flask, stir and react for 5h to obtain cross-linked starch; add to the above-mentioned cross-linked starch 0.3g acetic anhydride, control the temperature in a water bath at 85℃, stir the reaction for 3h, the reaction is over, add 38% acetic acid solution with mass concentration to the beaker, adjust the pH to 6.7, filter with suction to obtain the filter residue, wash the filter residue with deionized water 5 Then, place it in an oven at 105°C and dry for 2 hours to obtain cross-linked esterified starch; add the above-mentioned cross-linked esterified starc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a preparation method of a modified starch biodegradable film and belongs to the technical field of environmental science. The preparation method includes: using sweet potato starch as a raw material, crosslinking with epoxy polypropylene as a crosslinking agent to obtain crosslinked starch, esterifying the crosslinked starch with acetic anhydride to obtain crosslinked esterified starch, adding deionized water, an enhancer polyvinyl alcohol, a water repellent urea, a crosslinking agent glyoxal and a plasticizer glycerol into the crosslinked esterified starch, and subjecting the crosslinked esterified starch to swelling, pasting and crosslinking reaction to obtain a substance of certain viscosity, spreading the substance to polyester flakes, drying, and taking down a film to obtain the modified starch biodegradable film. The film prepared herein has good biodegradability, is free of environmental pollution, good in water resistance and high in stability, and is good in water tolerance and high in mechanical strength.

Description

technical field [0001] The invention discloses a preparation method of a modified starch biodegradable film, which belongs to the field of environmental science and technology. Background technique [0002] With the increasing shortage of petroleum resources and people's increasing concern about green environmental issues, the plastics industry is focusing more on materials research on raw materials derived from natural and renewable resources. Starch is an inexhaustible renewable resource on the earth, and they have a variety of structures, easy to chemical and physical modification, and have the advantages of biodegradability, biocompatibility and safety. The development and promotion of renewable resource products is not only conducive to the protection of the ecological environment, but also conducive to the development of new crops and new chemical technologies, as well as the promotion of agricultural growth and employment opportunities, bringing greater economic benef...

Claims

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Application Information

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IPC IPC(8): C08L3/06C08L29/04C08K5/21C08K5/07C08K5/053C08J3/24C08J5/18C08B31/04
CPCC08L3/06C08B31/04C08J3/24C08J5/18C08J2303/06C08J2429/04C08L2201/06C08L2203/16
Inventor 陈建峰孟浩影
Owner 陈建峰
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