Polyvinyl alcohol sponge with high elongation and preparation method thereof

A polyvinyl alcohol sponge and polyvinyl alcohol technology, applied in the field of polymer materials, can solve the problems of high consumption, waste of resources and environment, difficult interaction of reactants, etc., and achieve less waste of resources, good environmental protection, and good controllability Effect

Active Publication Date: 2020-08-07
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method needs to consume a large amount of water, resulting in waste of resources and environmental pollution
In terms of the mechanical properties of the sponge, if the starch in the sponge is not completely washed off, the sponge is easily corroded during use
In addition, during the preparation process, the reaction conditions are difficult to precisely control
If the heating rate is too fast, the acetal is too high, which will cause the sponge to agglomerate and form a compact material, and the mesh structure is difficult to form well, making it difficult for the reactants to continue to interact
The stretchability of the polyvinyl formal sponge obtained in this way is relatively poor, and the stretch rate is generally 200-300%, and the sponge structure is easily destroyed in the repeated stretching process.
In terms of personal health, the above preparation method uses formaldehyde, so the product inevitably contains free formaldehyde, which will cause potential health hazards to both the preparation experimenters and product users

Method used

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  • Polyvinyl alcohol sponge with high elongation and preparation method thereof
  • Polyvinyl alcohol sponge with high elongation and preparation method thereof
  • Polyvinyl alcohol sponge with high elongation and preparation method thereof

Examples

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preparation example Construction

[0023] The invention provides a kind of preparation method (abbreviation method) of polyvinyl alcohol sponge with high elongation, it is characterized in that the method comprises the following steps:

[0024] (1) After mixing polyvinyl alcohol (PVA), cellulose, carbonate and deionized water, stir magnetically at a temperature of 80-100°C for 1-2 hours under closed conditions until the dissolution is complete, and a uniform milky white polyethylene is obtained Alcoholic solution;

[0025] In step 1), the sealing condition is to adopt tin foil or plastic wrap to seal the container to prevent moisture from evaporating.

[0026] In step 1), the carbonate includes calcium carbonate, potassium carbonate or sodium carbonate etc. (preferably calcium carbonate).

[0027] In step 1), the cellulose is bacterial cellulose (BC); the mass ratio of polyvinyl alcohol, bacterial cellulose, carbonate to deionized water is 42-46:2-4:8-12:240- 260 (preferably 45:6:10:250); the molecular weight...

Embodiment 1

[0042] (1) Put 10g of polyvinyl alcohol (molecular weight: 145000), 0.6g of bacterial cellulose, 3g of calcium carbonate and 100ml of deionized water in a beaker, place a stirring bar of appropriate size, then seal it with tin foil, and stir it magnetically at 95°C Stir and dissolve in a water bath for 1.5 hours to obtain a uniform milky white polyvinyl alcohol solution;

[0043](2) Cool down the polyvinyl alcohol solution to 76°C, pour the mixed 10ml emulsifier OP-10 and 14ml dimethyl carbonate into the beaker containing the polyvinyl alcohol solution at one time, and stir for 2 hours until the solution reacts as White and sticky, take out the magnetic stirrer;

[0044] (3) Cool the white viscous solution to 36°C, add 12ml of foaming agent n-pentane, and use a strong mixer to stir at a speed of 1500r / min until bubbles of uniform size are generated in the solution to obtain a foamed solution;

[0045] (4) Pour the foamed solution into the mold, and freeze-thaw repeatedly 3 ti...

Embodiment 2

[0064] (1) Put 10g of polyvinyl alcohol (molecular weight: 145000), 0.6g of bacterial cellulose, 3g of calcium carbonate and 110ml of deionized water in a beaker, place a stirring bar of appropriate size, then seal it with tin foil, and stir it magnetically at 95°C Stir and dissolve in a water bath for 1.5 hours to obtain a uniform milky white polyvinyl alcohol solution;

[0065] (2) Cool down the polyvinyl alcohol solution to 76°C, pour the mixed 10ml emulsifier OP-10 and 14ml dimethyl carbonate into the beaker containing the polyvinyl alcohol solution at one time, and stir for 2 hours until the solution reacts as White and sticky, take out the magnetic stirrer;

[0066] (3) Cool the white viscous solution to 36°C, add 12ml of foaming agent n-pentane, and use a strong mixer to stir at a speed of 1500r / min until bubbles of uniform size are generated in the solution to obtain a foamed solution;

[0067] (4) Pour the foamed solution into the mold, and freeze and thaw repeatedly...

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Abstract

The invention discloses a polyvinyl alcohol sponge with high elongation and a preparation method thereof. The method comprises the following steps: mixing polyvinyl alcohol, cellulose, carbonate and deionized water, and performing stirring under a closed condition until the components are completely dissolved to obtain a uniform polyvinyl alcohol solution; adding a mixture of an emulsifier and esters into the polyvinyl alcohol solution, and performing stirring until the reaction is complete to obtain a white viscous solution; adding a foaming agent into the white viscous solution, and performing stirring by using a strong stirrer until bubbles with uniform sizes are generated in the solution, so as to obtain a foamed solution; and pouring the foamed solution into a mold, and carrying out freeze thawing to obtain the polyvinyl alcohol sponge with high elongation. Compared with an existing polyvinyl alcohol sponge manufacturing process, the freeze thawing method used in the method has the advantages of being easy to control, good in environmental protection property, little in resource waste, capable of avoiding harm of formaldehyde to human health and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, in particular to a polyvinyl alcohol sponge with a high elongation rate and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (Polyvinyl Alcohol, PVA) sponge is composed of a mesh structure cross-linked by numerous polymer chains. Polyvinyl alcohol has strong hydrophilicity, so it can absorb and store a large amount of water, and maintain a certain mechanical strength after absorbing water. In addition, polyvinyl alcohol is a polymer material with light weight, and it can be made into a porous sponge structure, which can also be used in fields such as heat insulation and sound insulation. [0003] Existing polyvinyl alcohol sponge is mainly polyvinyl formal sponge. In terms of resources and environmental protection, the preparation of polyvinyl formal sponge generally uses starch as an auxiliary foaming agent. After the sponge is solidified and formed, the exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L1/04C08K3/26C08K3/04C08J9/14C08J9/28
CPCC08J9/141C08J9/28C08J2329/04C08J2401/04C08J2203/14C08J2201/0484C08J2205/044C08K2003/265C08K3/042C08K2201/001
Inventor 孟垂舟王鹏孙桂芬高建卫张昊天郭士杰李国显
Owner HEBEI UNIV OF TECH
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