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A kind of preparation method of highly diffusible water-absorbing resin

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

Active Publication Date: 2017-11-14
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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Abstract

The invention discloses a method for preparing a highly diffusible water-absorbing resin. First, add acrylic acid, 50% sodium hydroxide solution, a composite crosslinking agent, sodium bicarbonate, ethanol, silicon dioxide and deionized water into a reactor, and mix After uniformity, pass nitrogen gas to remove oxygen for 20 minutes; then add initiator at 5-10°C to initiate the polymerization reaction, the temperature will no longer rise as the reaction is over, keep warm at 80°C for 2 hours, and obtain polymer colloid; the colloid is granulated to obtain resin particles , and dried at 180°C until the moisture content is less than 3%; finally, the surface treatment solution is evenly sprayed on the particles for surface treatment, and the product is obtained by holding at 180°C for 40 minutes. The resin particle of the present invention has a loose porous structure, embedded with many channels, and the contact area is greatly increased, so it has the effect of instantaneous suction, and each channel is in contact with each other in series, and due to capillary action, it is beneficial to the conduction of water between particles.

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 Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/20C08F2/44C08F6/00C08K3/36C08J9/08C08J9/02
Inventor 张肇庚
Owner 诺宸股份有限公司
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