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Method for preparing polyvinyl alcohol and polyurethane super absorbent sponge

A technology of polyvinyl alcohol and polyurethane, which is applied in the preparation of polyvinyl alcohol-polyurethane water-absorbing sponge, and in the field of polyvinyl alcohol-polyurethane superabsorbent sponge, which can solve the problem that the water absorption rate cannot meet the requirements of urban life, and the hydrophilicity and water retention are still to be expected. Improvement, sponge cells are not uniform and fine, etc., to reduce the impact of pollution and product toxicity, reduce the probability of large cells or hollow collapse, and the effect of moderate hardness

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although polyvinyl acetal absorbent sponges are widely used, their performance is not ideal, and their applications are limited. They also have the following disadvantages: 1) aldehydes are toxic and highly volatile, so they are difficult to produce and use. Unsafe, harmful to health and seriously polluting the environment; 2) The water absorption rate cannot meet the requirements of modern industry and urban life; 3) The hydrophilicity and water retention need to be improved; 4) The sponge cells are not uniform and fine; 5) High temperature resistance Not good; 6) Difficult to modify and apply to other fields

Method used

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  • Method for preparing polyvinyl alcohol and polyurethane super absorbent sponge
  • Method for preparing polyvinyl alcohol and polyurethane super absorbent sponge
  • Method for preparing polyvinyl alcohol and polyurethane super absorbent sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of polyvinyl alcohol-polyurethane superabsorbent sponge, comprising the steps of:

[0030] (1) Add 5g of polyvinyl alcohol of type 1799 and 30g of distilled water into the reactor, and dissolve it for 20min under the condition of a rotating speed of 400r / min in a water bath at 90-95°C to obtain an aqueous solution of polyvinyl alcohol .

[0031] (2) Take the above polyvinyl alcohol aqueous solution, add dropwise 5g of water-based polyurethane prepolymer, the model is Bayhydur305, then add dropwise 0.8g of catalyst stannous octoate, mix evenly in a water bath at 30°C, and stir in a mixer at a speed of 400r / min Under stirring, react for 5 minutes.

[0032] (3) Curing the colloidal solution obtained in step (2) at 60°C for 2 hours, the resulting product is white sponge-like, with uniform cells and micron-level pores; light and elastic, good flexibility; moderate hardness, water absorption Afterwards, it can become soft, and has excellent water absorp...

Embodiment 2

[0035] A preparation method of polyvinyl alcohol-polyurethane superabsorbent sponge, comprising the steps of:

[0036] (1) Add 2g of polyvinyl alcohol of type 1788, 3g of type 1799, and 37.5g of distilled water into the reactor, and dissolve it for 30min under the condition of a speed of 600r / min with a stirrer in a water bath of 50-60°C, An aqueous solution of polyvinyl alcohol is obtained.

[0037] (2) Take the above-mentioned polyvinyl alcohol aqueous solution, add dropwise 5g model is Bayhydur2655, 5g model is the aqueous polyurethane prepolymer of Bayhydur401-7, then add dropwise catalyst stannous octoate 0.4g, triethylenediamine 0.4g, carboxylate Potassium dibutyltin 0.4g, dibutyltin dilaurate 0.4g, add 4g starch, 0.8g pentane, 0.05g glutaraldehyde, 0.8g sodium lauryl sulfate at the same time, mix evenly in 80 ℃ water bath, in the mixer at the speed of Under 600r / min stirring, react for 10min.

[0038] (3) Put the colloidal solution obtained in step (2) into an oven, a...

Embodiment 3

[0041] A preparation method of polyvinyl alcohol-polyurethane superabsorbent sponge, comprising the steps of:

[0042] (1) Add 1g of polyvinyl alcohol of model 1799, 2g of model 1788, 2g of model 124, and 5g of distilled water into the reactor, and dissolve it in a water bath at 90°C with a stirrer at a speed of 500r / min 25min to obtain polyvinyl alcohol aqueous solution.

[0043](2) Get above-mentioned polyvinyl alcohol aqueous solution, add dropwise the aqueous polyurethane prepolymer of 5gBayhydurT0607, 5gBayhydurN3390, 5gBayhydur2547, 5gBayhydur 3100, 5gBayerBayhydrol BL 5140, then add dropwise 0.4g catalyst stannous octoate and 0.4g triethylenediamine, At the same time, add 1g starch, 0.5g calcium carbonate (old powder), 0.5g magnesium silicate (talc powder), 0.5g barite powder, 0.5g pentane, 0.5g hexane, 0.05g glutaraldehyde, 0.05g butanediol Aldehyde, 0.05g phosphoric acid, 0.05g benzenesulfonic acid, 0.1g sodium lauryl sulfate, 0.1g silicone oil, 0.1g stearic acid, 0....

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Abstract

The invention discloses a method for preparing a polyvinyl alcohol and polyurethane super absorbent sponge. The method includes mixing polyvinyl alcohol with distilled water at first, dissolving the polyvinyl alcohol for 20 to 30 minutes under the condition that the water bath temperature ranges from 50 DEG C to 95 DEG C and rotational speed ranges from 400r / min to 600r / min to obtain polyvinyl alcohol aqueous solution; and then heating the polyvinyl alcohol aqueous solution until the temperature of the polyvinyl alcohol aqueous solution ranges from 30 DEG C to 100 DEG C, adding water-based polyurethane prepolymer, catalysts and auxiliary foaming agents into the polyvinyl alcohol aqueous solution, stirring and uniformly mixing the mixture under the condition of rotational speed ranging from 400r / min to 600r / min, enabling the mixture to react for 5 minutes to 10 minutes, and solidifying the mixture for 2 to 4 hours at the temperature ranging from 30 DEG C to 100 DEG C to obtain the sponge with the water absorbent rate higher than 9.8. The water absorbent rate of the obtained sponge is increased to 10-20 times from the original 6-8 times of an existing polyvinyl acetal sponge, the water absorbing velocity of the sponge is increased to 8g / ming from the original 4g / ming, and the polyvinyl alcohol and polyurethane super absorbent sponge has a broad development prospect in fields of aquatic product processing, food, clinical medicine, water treatment and the like.

Description

technical field [0001] The invention relates to a superabsorbent sponge, in particular to a polyvinyl alcohol-polyurethane superabsorbent sponge, in particular to a polyvinyl alcohol-polyurethane water-absorbent sponge with high crosslink density, high water absorption rate, and good hydrophilicity. Preparation method of sponge. technical background [0002] Water-absorbing sponge is a new type of functional polymer material. It is a new type of functional polymer material with a certain degree of cross-linking and a three-dimensional network structure that contains strong hydrophilic groups such as hydroxyl and carboxyl groups. With super water absorption and water retention capacity, it is widely used in various fields such as forestry, horticulture, industry, medical treatment, and environmental protection. It can release and absorb water repeatedly, so it is likened to a "miniature reservoir". [0003] Among them, polyvinyl acetal water-absorbing sponge has attracted m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L75/04C08L3/02C08K13/02C08K3/26C08K3/34C08K3/30C08K3/36C08K5/09C08K3/00C08J9/26C08J9/14
Inventor 文秀芳罗志波皮丕辉关怀周洁莹胡俏衍蔡智奇林创发
Owner SOUTH CHINA UNIV OF TECH
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