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Starch-based plastic tableware and production method thereof

A technology for starch-based plastics and tableware, which is applied in the field of degradable tableware preparation and can solve the problems of poor toughness, poor stability, and difficulty in processing.

Inactive Publication Date: 2020-10-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Native starch has poor toughness after film formation, is easy to be brittle when bent, and does not melt when heated, which also brings certain difficulties to processing, and the prepared product has the characteristics of poor stability during use.

Method used

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  • Starch-based plastic tableware and production method thereof
  • Starch-based plastic tableware and production method thereof
  • Starch-based plastic tableware and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Dissolution of starch in DMSO solvent

[0041] Measure 100mL DMSO into a 250mL three-necked bottle, dry the cornstarch at 60°C for 24h in vacuum, weigh 20.0g of dried cornstarch and add it to the three-necked bottle, heat at 80°C until the starch is completely dissolved, and the time for heating to dissolve is 1h. Remove from heat and cool to room temperature.

[0042] 2) preparation of starch acetoacetate

[0043] Heat the starch solution dissolved in step 1) to 110°C, protect it with nitrogen, weigh 39.0g of tert-butyl acetoacetate and add it dropwise into a three-necked flask. The reaction mixture was added dropwise into an ethanol solvent to precipitate, the product was washed three times with ethanol solvent, filtered with suction, and dried in vacuum at 60° C. for 24 hours to obtain the product starch acetoacetate. The degree of substitution of the starch acetoacetate prepared by this method is 0.65, and the infrared spectrum is as follows: figure 1 Shown, t...

Embodiment 2

[0047] 1) the dissolving of starch in DMSO solvent is with example 1;

[0048] 2) preparation of starch acetoacetate

[0049] Heat the starch solution dissolved in step 1) to 110°C, protect with nitrogen, weigh 58.5g of tert-butyl acetoacetate and add it dropwise into a three-necked flask. The reaction mixture was added dropwise into an ethanol solvent to precipitate out, and the product was washed three times with an ethanol solvent, filtered with suction, and vacuum-dried at 60° C. for 24 hours to obtain starch acetoacetate product. The degree of substitution of starch acetoacetate prepared by the method is 1.38, and the nuclear magnetic spectrum of starch acetoacetate is as follows image 3 shown.

[0050] 3) Preparation of starch-based plastic tableware

[0051] Put the starch acetoacetate in step 2) into an extruder, mix evenly at 150° C. for 10 minutes, then melt and extrude it and inject it into a mold, and cool to room temperature to obtain starch-based plastic tabl...

Embodiment 3

[0053] 1) the dissolving of starch in DMSO solvent is with example 1;

[0054] 2) preparation of starch acetoacetate

[0055] Heat the starch solution dissolved in step 1) to 110°C, protect it with nitrogen, weigh 78.0g of tert-butyl acetoacetate and add it dropwise into a three-necked flask. The reaction mixture was added dropwise into an ethanol solvent to precipitate, and the product was washed three times with an ethanol solvent, filtered with suction, and vacuum-dried at 80° C. for 12 hours to obtain the product starch acetoacetate. The degree of substitution of starch acetoacetate prepared by the method is 1.80, and the nuclear magnetic spectrum of starch acetoacetate is as follows Figure 4 shown.

[0056] 3) Preparation of starch-based plastic tableware

[0057] Put starch acetoacetate in step 2) into an extruder and mix uniformly at 140° C. for 10 minutes, then melt and extrude it into a mold, and cool to room temperature to obtain starch-based plastic tableware. ...

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Abstract

The invention relates to starch-based plastic tableware and a production method thereof. The method comprises the following steps: adding dried starch into a solvent, heating for dissolving, and cooling to room temperature to obtain a starch solution; heating the starch solution to a reaction temperature under the protection of introduced nitrogen, dropwise adding tert-butyl acetoacetate, reactingat a constant temperature, cooling to room temperature, purifying, and carrying out vacuum drying to obtain starch acetoacetate; and adding the acetoacetic acid starch ester into an extruder, uniformly mixing, carrying out melt extrusion, injecting into a mold, and cooling to room temperature to obtain the sample. The production method for preparing the starch-based plastic tableware is simple inprocess, safe to operate and environmentally friendly, and the prepared starch-based plastic tableware has excellent waterproofness, heat resistance and good mechanical performance and is a high-quality full-degradable environment-friendly product.

Description

technical field [0001] The invention belongs to the field of degradable tableware preparation, in particular to a starch-based plastic tableware and a preparation method thereof. Background technique [0002] With the development of the economy, the prosperity of the tourism and takeaway industries has accelerated the consumption of disposable tableware. However, most disposable plastic products are discarded after completing their functions, and most of them are disposed of in simple ways such as incineration, landfill or dumping, and the recycling rate is very low. In addition, ordinary disposable plastic tableware has the disadvantage of being difficult to biodegrade, which has brought serious environmental pollution and is difficult to develop for a long time. With the growing awareness of green environmental protection, countries around the world have begun to pay more attention to the pollution of disposable plastic tableware products in daily life. The preparation o...

Claims

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Application Information

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IPC IPC(8): C08L3/06C08B31/04C08J5/18
CPCC08B31/04C08J5/18C08J2303/06C08L3/06C08L2201/06C08L2201/08
Inventor 祁海松刘宏臣张存智党超王明冯晓余杰袁亚芳
Owner SOUTH CHINA UNIV OF TECH
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