Polyvinyl alcohol spongy material and production method thereof

A polyvinyl alcohol sponge and polyvinyl alcohol technology, applied in the field of sponge materials, can solve the problems of high process requirements, sensitive to changes in foaming conditions, etc., and achieve high application value, large water absorption capacity, and the effect of promoting deepening cross-linking.

Inactive Publication Date: 2015-08-12
徐禄贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, the mechanical foaming method uses less reagents and has greater market potential in the field of medical materials, but the mechanical foaming method has higher requirements on the process and is sensitive to changes in foaming conditions during the enlargement process. Product quality stability is challenging

Method used

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  • Polyvinyl alcohol spongy material and production method thereof
  • Polyvinyl alcohol spongy material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A preparation method of polyvinyl alcohol sponge material, comprising the steps of:

[0080] (1) Preparation of polyvinyl alcohol aqueous solution: 10 kg of polyvinyl alcohol was stirred in 200 kg of water at a temperature of 60° C., and dissolved for 10 min at a rotational speed of 500 r / min to obtain a polyvinyl alcohol aqueous solution.

[0081] (2) Preparation of foaming solution: Take 100kg of the above-mentioned polyvinyl alcohol aqueous solution and heat it to 40°C. At a stirring speed of 600r / min, add 0.5kg of azodicarbonamide (AC) foaming agent, stir for 8min, and then add 1kg of sodium lauryl sulfate dispersant was stirred for 5 minutes to obtain a foaming solution.

[0082] (3) Acetalization: at a stirring speed of 1200r / min, add 10kg of hydrochloric acid, stir for 10min, add 12kg of formaldehyde, reduce the stirring speed to 400r / min, stir for 10min, add 0.3kg of foam stabilizer dodecyl di Methyl amine oxide, and gradually reduce the stirring speed until th...

Embodiment 2

[0085] Pour 100g of the slurry obtained in Example 1 into a sealed mold, raise the temperature to 50°C, keep it warm for 10 minutes, then raise the temperature to 150°C, keep it warm for 30s, then lower the temperature to 50°C, and keep it for 2 hours to solidify the molding process After the completion, the temperature of the system is lowered to room temperature, and the foaming material is removed from the mold for multiple washing and drying processes, and processed to obtain a polyvinyl alcohol sponge material.

[0086] The performance test results of the sponge material are that the average pore diameter is 2.4nm, the opening rate is 80%, the water absorption rate is 1500%, and the apparent density is 0.06g / cm 3 .

Embodiment 3

[0088] Pour 100g of the slurry obtained in Example 1 into a sealed mold, raise the temperature to 60°C, keep it warm for 30 minutes, then raise the temperature to 130°C, keep it warm for 60s, then lower the temperature to 60°C, and keep it for 2 hours to solidify the molding process After the completion, the temperature of the system is lowered to room temperature, and the foaming material is removed from the mold for multiple washing and drying processes, and processed to obtain a polyvinyl alcohol sponge material.

[0089] The performance test results of the sponge material are that the average pore diameter is 2.6nm, the opening rate is 85%, the water absorption rate is 2000%, and the apparent density is 0.05g / cm 3 .

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Abstract

The present invention discloses a polyvinyl alcohol spongy material, which has a three-dimensional perforated structure, average bubble diameter size of 2-3 mm, porosity of 70-98% and a degree of acetalization of 50-85%. The invention also discloses a production method of the polyvinyl alcohol sponge material. The method comprises the steps of: preparing an aqueous solution of polyvinyl alcohol; stirring the polyvinyl alcohol solution, or adding a foaming agent or a pore-forming agent in the aqueous solution of polyvinyl alcohol to obtain a foaming solution; adding aldehyde as a crosslinking agent into the foaming solution to obtain a slurry, curing the slurry, rinsing and drying after forming to obtain a polyvinyl alcohol sponge material, wherein at least one of the slurry acquisition, curing, rinsing and drying processes comprises a process of rising the temperature to 90-150 DEG C and insulating for 10-900 s. Through heat treatment on the foaming system, the polyvinyl alcohol sponge material with larger aperture, high opening rate, good water absorption, high water absorption capacity and high value of application is prepared.

Description

technical field [0001] The invention relates to the technical field of sponge materials. More specifically, the present invention relates to a polyvinyl alcohol sponge material and its manufacturing method. Background technique [0002] Polyvinyl alcohol (referred to as PVA) acetal superabsorbent materials have been widely used in the fields of electronics industry, daily cleaning, medical hygiene, building materials, etc. due to their excellent water absorption function and physical properties, such as heat resistance and wear resistance. Applications. Polyvinyl alcohol sponge products have excellent chemical stability, such as acid and alkali resistance; a porous structure with high water absorption and water retention properties can be obtained by cross-linking foaming methods, and at the same time it has fast water absorption rate, high liquid absorption rate, and water absorption. After soft and delicate characteristics. Polyvinyl alcohol sponge itself is not suitabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/14C08F16/06C08F8/28C08J9/30C08J9/26C08J9/28C08J9/10C08J9/08
Inventor 徐禄贵
Owner 徐禄贵
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