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Polyvinyl alcohol sponge and preparation method thereof

A technology of polyvinyl alcohol sponge and polyvinyl alcohol solution, applied in coating and other directions, can solve the problems of reducing the life of sponge products, denaturation of sponge materials, and degradation of sponge performance, etc., and achieves the effects of fine hand feeling, reduction of residues, and improvement of yield.

Inactive Publication Date: 2015-06-10
侯春英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the process stability of polyvinyl alcohol foaming materials and improve the product life cycle, in the process of analyzing the stability of polyvinyl alcohol foam, it was found that the pH value has a great influence on the foaming process of polyvinyl alcohol sponge, the system Under high temperature and high humidity conditions, the residual acid in the product will cause the product to turn yellow and even cause the denaturation of the sponge material, resulting in a significant decline in the performance of the sponge and reducing the product life of the sponge

Method used

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  • Polyvinyl alcohol sponge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (a) preparing a polyvinyl alcohol solution, stirring 15 parts of polyvinyl alcohol in 200 parts (by weight) of water at a temperature of 60-80°C to form a polyvinyl alcohol solution;

[0085] (b) Prepare the foaming solution: take 100g of the polyvinyl alcohol solution prepared in step (a), blow carbon dioxide gas into the system for 5-10 minutes, keep the carbon dioxide gas atmosphere, heat to 40-50°C, and control the stirring speed to 1000 -1300 rpm, stirring for 20-30 minutes;

[0086] (c) Acetal reaction, keep the carbon dioxide gas atmosphere, control the stirring speed at 800-900 rpm, add 15g of hydrochloric acid, stir for 10-20 minutes, add 15g of formaldehyde, reduce the stirring speed to 700-800 rpm, stir for 10- After 30 minutes, add 0.3g of foam stabilizer OP-10, and gradually reduce the stirring speed until the stirring stops, the process is about 5-10 minutes.

[0087] (d) Curing molding: Pour the slurry stirred in (c) into the mold after carbon dioxide re...

Embodiment 2

[0090] (a) Prepare a polyvinyl alcohol solution, under the condition of nitrogen protection, stir 10 parts of polyvinyl alcohol in 200 parts (by weight) of water at a temperature of 60-80°C to form a polyvinyl alcohol solution;

[0091] (b) Prepare the foaming solution: Take 100kg of the polyvinyl alcohol solution prepared in step (a), add it to a reaction kettle filled with nitrogen, heat it to 40-50°C, control the stirring speed at 600-700 rpm, add the foaming Agent AC (azodicarbonamide) 0.5kg, stir for 5-10 minutes, add dispersant 1kg; stir for 5-20 minutes;

[0092] (c) Acetal reaction, in a nitrogen atmosphere, control the stirring speed at 700-1200 rpm, add 10 kg of hydrochloric acid, stir for 10-20 minutes, add 12 kg of formaldehyde, reduce the stirring speed to 400-500 rpm, stir for 10- After 30 minutes, add 0.3kg of foam stabilizer OP-10, and gradually reduce the stirring speed until the stirring stops, the process is about 5-20 minutes.

[0093] (d) Transfer the mol...

Embodiment 3

[0096] (a) Prepare a polyvinyl alcohol solution, under the condition of nitrogen protection, stir 20 parts of polyvinyl alcohol in 200 parts (by weight) of water at a temperature of 70-90°C to form a polyvinyl alcohol solution;

[0097] (b) Configure foaming solution: Take 100kg of polyvinyl alcohol solution configured in step (a), add it to the reaction kettle, heat to 40-50°C, control the stirring speed at 700-800 rpm, add foaming agent AC ( Azodicarbonamide) 0.5kg, stirred for 5-10 minutes, added 1kg of dispersant; stirred for 5-20 minutes;

[0098] (c) Acetal reaction, in the atmosphere of oxygen-poor air (air and nitrogen 1 / 1 volume mixing), control the stirring speed 700-1200 rpm, add 10kg of hydrochloric acid, stir for 10-20 minutes, add 12kg of formaldehyde, reduce Stir the speed to 400-500 rpm, stir for 10-30 minutes, add 0.3kg of foam stabilizer OP-10, and gradually reduce the stirring speed until the stirring stops, the process is about 5-20 minutes.

[0099] (d) T...

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Abstract

The invention discloses a polyvinyl alcohol foaming material and a preparation method thereof. According to the method, the foaming technological process is optimized, so that the product technological stability of the polyvinyl alcohol sponge foaming process is effectively improved, the product service life is effectively prolonged, the problems that the polyvinyl alcohol sponge becomes yellow and is aged when used for a long time on the specific condition are solved, the product quality of the polyvinyl alcohol sponge is improved, and the obtained polyvinyl alcohol sponge has higher application value.

Description

technical field [0001] The invention relates to a polyvinyl alcohol sponge and a preparation method thereof. Can be widely used in industrial cleaning, rapid local hemostasis, pharmaceutical carrier and polyvinyl formal sponge for cold and hot compress Background technique [0002] Polyvinyl alcohol (hereinafter referred to as PVA) acetal superabsorbent material has excellent water absorption function, good heat resistance and wear resistance, and has been widely used in the fields of electronics industry, daily cleaning, medical hygiene, building materials, etc. Application, the product has excellent chemical stability, acid and alkali resistance; the product has high water absorption and water retention performance, fast water absorption rate, high liquid absorption rate, soft and delicate after absorbing water. Because it is not suitable for bacterial growth and has a soft texture after absorbing water, compared with traditional gauze, absorbent cotton, and gelatin hemos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/04C08L29/14C08F116/06C08F8/28
Inventor 侯春英
Owner 侯春英
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