Preparation method of hydrophobic degradable starch nano composite film and obtained product

A starch nano-composite film technology, applied in the field of new functional materials, can solve problems such as poor hydrophobicity and poor mechanical properties, and achieve the effects of improved mechanical properties, high concentration of production capacity, and abundant supply

Active Publication Date: 2021-10-01
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of poor hydrophobicity and poor mechanical properties of existing starch films, the present invention provides a method for preparing a hydrophobic and degradable starch nanocomposite film and the resulting product. The preparation method has easy-to-obtain raw materials, low cost and can be implemented Introduce starch carbon nanospheres or starch carbon nanospheres and nano-calcium carbonate into the starch film. These introduced substances do not change the structure of the film-forming starch, and at the same time greatly improve the hydrophobicity and mechanical properties of the starch film. performance, has excellent application prospects

Method used

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  • Preparation method of hydrophobic degradable starch nano composite film and obtained product
  • Preparation method of hydrophobic degradable starch nano composite film and obtained product
  • Preparation method of hydrophobic degradable starch nano composite film and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Dissolve 2 g of cornstarch in 70 ml of ultrapure water, heat and stir in a magnetic stirrer at about 60°C for 30 minutes to obtain a uniform turbid liquid, transfer the turbid liquid to a high-pressure reaction kettle, and heat at 180°C The lower seal was hydrothermally reacted for 8 h to obtain a turbid hydrothermal starch carbon nanosphere solution (hereinafter referred to as the pretreatment solution), which was cooled for later use.

[0044] (2) Dissolve 5g of cornstarch and 2.0g of glycerin in 80g of ultrapure water, pour the resulting mixture into a beaker, seal the mouth of the beaker with a film and insert it (the aperture should not be too large or too small), and heat it at about 97 °C After stirring in a magnetic stirrer for 1 hour, add 0 ml, 10 ml, 35 ml, 40 ml, 45 ml, 50 ml, 55 ml, 60 ml, 65 ml, 70 ml, and 75 ml of cooled pretreatment solution, Stirring was continued for 1 h in a magnetic stirrer at around 97 °C.

[0045] (3) Pour the mixed solution in...

Embodiment 2

[0051] (1) According to the method of Example 1, a hydrothermal starch carbon nanosphere solution (hereinafter referred to as the pretreatment solution) was prepared.

[0052] (2) Dissolve 5 g of cornstarch and 2.0 g of glycerin in 80 g of ultrapure water, pour the resulting mixture into a beaker, seal the mouth of the beaker with a film and insert it (the aperture should not be too large or too small), and put it at 97 °C Stir for 1 h on a left and right magnetic stirrer.

[0053] (3) Mix 55 ml of the pretreatment solution cooled in step (1) with 0.05 g, 0.1 g, 0.2 g, and 0.5 g of nano-calcium carbonate soaked in absolute ethanol respectively, and disperse the nano-calcium carbonate after 30 min of ultrasonic dispersion. Evenly dispersed in the pretreatment solution.

[0054] (4) Pour the mixed liquid that has been sonicated in step (3) into the beaker in step (2), and continue to stir in a magnetic stirrer at about 97 °C for 1 h.

[0055] (5) Pour the mixed solution in (4)...

Embodiment 3

[0061] (1) Prepare a hydrothermal carbon nanosphere solution (hereinafter referred to as pretreatment solution) according to the method in Example 1.

[0062] (2) Dissolve 5g of cornstarch in 80g of ultrapure water, then add 1.5g, 1.8g, 2.0g, and 2.5g of glycerin respectively, pour the resulting mixture into beakers, seal the mouth of the beaker with film too large or too small), after stirring for 1 hour in a magnetic stirrer at a temperature of about 97°C, add 55ml of the solution in step (1) to take out the cooled pretreatment solution in the autoclave. Stirring was continued for 1 h in a magnetic stirrer at around °C.

[0063] (3) Pour the mixed solution in (2) over the gauze and pour it on the template, and dry it in a blast drying oven at 35°C for 8 hours to prepare a starch nanocomposite film starch film with a thickness of 0.13-0.18 mm.

[0064] The contact angle, tensile strength, elongation at break and water permeability coefficient of the composite films obtained ...

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Abstract

The invention discloses a preparation method of a hydrophobic degradable starch nano composite film and an obtained product. The preparation method comprises the following steps: firstly, dissolving starch in water, and carrying out hydrothermal reaction in a high-pressure reaction kettle to obtain a turbid and uniform hydrothermal starch carbon nano microsphere solution; and adding the hydrothermal starch carbon nano-microsphere solution or a mixture of the hydrothermal starch carbon nano-microsphere solution and nano calcium carbonate into a mixed system consisting of starch, glycerol and water according to a certain dosage, gelatinizing the starch for a certain time, and preparing a composite film product by a casting method or a tape casting method. The method is easy to operate and high in feasibility, the degradable bio-based composite starch film is prepared without chemical modification, various substances are rich in source and low in price, and the prepared composite film is high in hydrophobicity, good in mechanical performance, high in cost performance and environmentally friendly.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic and degradable starch nanocomposite film and a product thereof, belonging to the technical field of new functional materials. Background technique [0002] With the further advancement of smart cities, the Internet of Things, big data, artificial intelligence, etc. have promoted the vigorous development of the catering industry, which has spawned more and more plastic products. However, plastic products cause serious environmental pollution because they are difficult to be biodegraded in the environment. At the same time, their raw materials are mainly petroleum. The increasing use of plastic products will inevitably further aggravate the "oil crisis" and lead to an increase in plastic prices. In response to this problem, in January 2020, the National Development and Reform Commission and the Ministry of Ecology and Environment issued the "Opinions on Further Strengthening Plastic Pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L3/02C08K3/04C08K9/04C08K3/26
CPCC08J5/18C08J2303/02C08K3/04C08K2003/265C08K2201/011C08K9/04Y02W90/10
Inventor 马家璇方奕珊耿超崔波王玉婷张志雯徐冉韩仲秋袁超刘鹏飞
Owner QILU UNIV OF TECH
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