Preparation method of high-diffusivity water-absorbent resin

A technology of water-absorbent resin and diffusibility, which is applied in the field of preparation of highly diffusible water-absorbent resin, which can solve problems such as difficult control, complicated operation, and poor hydrophilicity of the product, and achieve the effect of increasing the contact area and improving the utilization rate

Active Publication Date: 2015-03-25
诺宸股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated to operate and difficult to control, and the process of reverse suspension method needs to carry out polymerization reaction in organic solvent, and the product has poor hydrophilicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material composition and the parts by weight of each composition are:

[0018] Acrylic 220

[0019] 50% sodium hydroxide solution 200

[0020] Composite crosslinking agent 5

[0021] Sodium bicarbonate 6

[0022] ethanol 22

[0023] Silica 3

[0024] Deionized water 300

[0025] Hydrogen peroxide 0.8

[0026] Ascorbic acid 0.6

[0027] The preparation method is:

[0028] 1. Add the above-mentioned parts by weight of acrylic acid, 50% sodium hydroxide solution, composite cross-linking agent, sodium bicarbonate, ethanol, silicon dioxide and deionized water, mix well, and pass high-purity nitrogen gas to remove oxygen 20min.

[0029] 2. Add hydrogen peroxide and ascorbic acid to initiate the polymerization reaction at 5°C, and the reaction is considered to be over if the temperature does not rise any longer. The peak temperature is about 85°C, and the temperature is kept for 2 hours.

[0030] 3. Granulate the colloid and dry it at 180°C until the moisture co...

Embodiment 2

[0033] Raw material composition and the parts by weight of each composition are:

[0034] Acrylic 260

[0035] 50% sodium hydroxide solution 256

[0036] Composite crosslinking agent 7

[0037] Sodium bicarbonate 8

[0038] ethanol 36

[0039] Silica 5

[0040] Deionized water 400

[0041] hydrogen peroxide 1

[0042] Ascorbic acid 0.7

[0043] The preparation method is:

[0044] 1. Add the above-mentioned parts by weight of acrylic acid, 50% sodium hydroxide solution, composite cross-linking agent, sodium bicarbonate, ethanol, silicon dioxide and deionized water, mix well, and pass high-purity nitrogen gas to remove oxygen 20min.

[0045] 2. Add hydrogen peroxide and ascorbic acid to initiate the polymerization reaction at 6°C, and the reaction is considered to be over if the temperature does not rise any longer. The peak temperature is 90°C, and the temperature is kept for 2 hours.

[0046] 3. Granulate the colloid and dry it at 180°C until the moisture content is...

Embodiment 3

[0049] Raw material composition and the parts by weight of each composition are:

[0050] Acrylic 300

[0051] 50% sodium hydroxide solution 300

[0052] Composite crosslinking agent 10

[0053] Sodium bicarbonate 10

[0054] ethanol 50

[0055] Silica 6

[0056] Deionized water 500

[0057] Hydrogen peroxide 1.2

[0058] Ascorbic acid 0.7

[0059] The preparation method is:

[0060] 1. Add the above-mentioned parts by weight of acrylic acid, 50% sodium hydroxide solution, composite cross-linking agent, sodium bicarbonate, ethanol, silicon dioxide and deionized water, mix well, and pass high-purity nitrogen gas to remove oxygen 20min.

[0061] 2. Add hydrogen peroxide and ascorbic acid to initiate the polymerization reaction at 6°C, and the reaction is considered to be over if the temperature does not rise any longer. The peak temperature is about 90°C, and the temperature is kept above 80°C for 2 hours.

[0062] 3. Granulate the colloid and dry it at 180°C until th...

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PUM

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Abstract

The invention discloses a preparation method of a high-diffusivity water-absorbent resin. The preparation method comprises the following steps: adding acrylic acid, a 50% sodium hydroxide solution, a compound cross-linker, sodium bicarbonate, ethanol, silicon dioxide and deionized water to a reactor, mixing evenly, and then introducing nitrogen for 20 min to remove oxygen; next, adding an initiator at a temperature within the range of 5-10 DEG C to initiate a polymerization reaction, terminating the reaction when the temperature stops rising, and preserving heat for 2 hours at a temperature above 80 DEG C, thereby obtaining polymeric colloid; pelleting the colloid to obtain resin particles and drying at 180 DEG C until the moisture content is lower than 3%; and finally, evenly spraying a surface treating fluid to the particles for surface treatment, and preserving heat at 180 DEG C for 40 minutes, thereby obtaining the product. According to the preparation method of the high-diffusivity water-absorbent resin, the resin particles are of a loose porous structure, numerous pore passages are formed inside the resin particles and the contact area is greatly increased, and therefore, the high-diffusivity water-absorbent resin has an instantaneous absorption effect; and the pore passages are in contact and connected in series with each other, and due to the capillary action, moisture can be transferred among the particles smoothly.

Description

technical field [0001] The invention relates to the field of functional polymer chemical additives, in particular to a preparation method of a highly diffusible water-absorbing resin. Background technique [0002] At present, polyacrylic acid accounts for 80% of the world's superabsorbent resin production. It is widely used in disposable diapers and hygiene products because of its super water absorption and water retention functions, and this application accounts for more than 70% of SAP demand. However, there are certain defects in this kind of products, for example, the diffusibility of liquid between particles is poor during absorption, which leads to low utilization rate of the water-absorbing resin in sanitary products and causes waste. At present, there are also studies and reports on the porosity of superabsorbent resins, such as Lei Guangcai et al. using the reversed phase suspension polymerization method (Lei Guangcai, Ding Lintong, etc. Formation and control of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/20C08F2/44C08F6/00C08K3/36C08J9/08C08J9/02
Inventor 荣敏杰许永升于庆华
Owner 诺宸股份有限公司
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