Method for preparing nano SiO2 composite starch/polyvinyl alcohol membrane

A polyvinyl alcohol film and composite starch technology, applied in the field of functional materials, can solve the problems of low mechanical strength, poor water resistance and wet strength, etc., and achieve the effects of less equipment investment, enhanced strength, and changed roughness

Inactive Publication Date: 2014-10-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structure of starch itself, the products produced by it have low mechanical strength, poor water resistance and wet strength, etc., which limit its wide application.

Method used

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  • Method for preparing nano SiO2 composite starch/polyvinyl alcohol membrane
  • Method for preparing nano SiO2 composite starch/polyvinyl alcohol membrane
  • Method for preparing nano SiO2 composite starch/polyvinyl alcohol membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of starch film, the method step is as follows:

[0029] 1) Preparation of starch solution

[0030] Corn starch (Tianjin Zhongying Health Food Co., Ltd.) and deionized water (Motianmo Technology Co., Ltd., Tianjin University of Technology) were mixed in a certain proportion to form a 10% solution.

[0031] 2) Preparation of starch film

[0032] Place in a digital display magnetic stirrer (type 98-3, Gongyi Yingyu Instrument Factory) to heat up and stir at a certain speed. When the temperature of the solution reaches 95°C, control the temperature of the solution to be constant until the solution becomes clear, keep it warm for 1 hour, and make a film

[0033] 3) Preparation of starch porous membrane.

[0034] After the film was cooled to room temperature, it was poured into liquid nitrogen, frozen for 24 hours, and vacuum freeze-dried for 48 hours.

[0035] figure 1 It is a scanning electron microscope picture of the surface of the prepar...

Embodiment 2

[0037] A preparation method of starch / polyvinyl alcohol film, the method steps are as follows:

[0038] 1) Preparation of starch / polyvinyl alcohol solution

[0039] Cornstarch and polyvinyl alcohol (Tianjin Aoqi Medical and Pharmaceutical Sales Co., Ltd.) were mixed with deionized water at a mass ratio of 3:7 to prepare a 10% solution.

[0040] 2) Preparation of starch / polyvinyl alcohol film

[0041] Place on a digital display magnetic stirrer to heat up and stir at a certain speed. When the solution temperature reaches 95°C, control the solution temperature to be constant (be careful not to let the solution boil), until the solution becomes clear, keep it warm for 1 hour, and form a membrane.

[0042] 3) Preparation of starch / polyvinyl alcohol porous membrane

[0043] After the film was cooled to room temperature, it was poured into liquid nitrogen, frozen for 24 hours, and vacuum freeze-dried for 48 hours.

[0044] figure 2 is the scanning electron microscope picture o...

Embodiment 3

[0046] A SiO 2 / starch film or SiO 2 The preparation method of the preparation of / starch / polyvinyl alcohol film, this method step is as follows:

[0047] 1)SiO22 / starch solution or SiO 2 / Preparation of starch / polyvinyl alcohol solution

[0048] nano-SiO 2 Placed in the water phase, ultrasonically dispersed for 60 minutes to break up aggregates and form relatively stable nano-SiO 2 Water dispersion system, its addition amount is 2% of the dry weight of starch / polyvinyl alcohol (or starch), and then starch / polyvinyl alcohol (or starch) is added to SiO in a certain proportion 2 In the solution, make a 10% solution, and stir and disperse at a high speed for 15 minutes at room temperature to prevent SiO 2 reunited again

[0049] 2)SiO2 2 / starch film or SiO 2 / Starch / polyvinyl alcohol film preparation

[0050] Place on a digital display magnetic stirrer to heat up and stir at a certain speed. When the solution temperature reaches 95°C, control the solution temperatur...

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Abstract

The invention discloses a method for preparing a nano SiO2 composite starch / polyvinyl alcohol membrane, belonging to the technical field of functional materials. The preparation method comprises the following steps: 1, adding corn starch, corn starch / polyvinyl alcohol, and starch / polyvinyl alcohol or starch to ultrasonically dispersed nano SiO2 to mix with deionized water, and preparing a certain concentration of solution; 2, putting the solution in the step 1 into a digital magnetic stirrer to heat up, stirring the solution at a certain speed, controlling the temperature of the solution to be constant when the temperature of the solution achieves certain temperature, paying attention to preventing the solution from boiling until the solution becomes clear, carrying out heat preservation for a certain period of time, and preparing the membrane; and 3, cooling the polymeric membrane sample prepared in the step 2 at room temperature for a certain period of time, pouring into liquid nitrogen, freezing the polymeric membrane sample for a certain period of time, and freezing and drying the polymeric membrane sample in vacuum for a certain period of time, so as to obtain micro-nano porous starch membranes which are even in aperture distribution. The method disclosed by the invention has the advantages of simple process, low energy consumption, high efficiency and the like.

Description

technical field [0001] The present invention relates to a kind of nano SiO 2 The invention relates to a preparation method of a composite starch / polyvinyl alcohol film, which belongs to the technical field of functional materials. Background technique [0002] As an important raw material for industrial production, starch is not only widely used in papermaking, textile, medicine, rubber, plastics and other fields, but also attracts people's attention in emerging industries such as resin, plastic film and surfactant. Among them, starch is widely used in warp yarn sizing due to its wide range of sources, low cost, good adhesion to natural fibers, and green and renewable advantages. At present, the size on the market is mainly based on starch, polyvinyl alcohol (PVA) and acrylic acid. However, due to the structure of starch itself, the products produced by it have low mechanical strength, poor water resistance and wet strength, etc., which limit its wide application. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08K3/36C08J5/18C08J9/28
Inventor 李广芬张金超梁绍磊
Owner TIANJIN POLYTECHNIC UNIV
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