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Preparation method of double-crosslinking high-water-absorbability resin

A high water-absorbent resin and double cross-linking technology, which is applied in the field of resin materials, can solve the problems that limit the application of water-absorbent resins, and achieve the effects of fast absorption rate, stable cross-linked network, and high saline absorption rate

Active Publication Date: 2019-05-28
珠海得米新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, as described in the patent CN103275450, the deionized absorption (natural absorption) of the product can reach 426g / g, but its pressure absorption is only 35.6g / g, which greatly limits the application of water-absorbent resins field

Method used

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  • Preparation method of double-crosslinking high-water-absorbability resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of a double-crosslinked superabsorbent resin, comprising the following steps:

[0033] (1) dissolving sodium hydroxide in deionized water to obtain an aqueous solution (i.e. alkaline solution A) of 55% by mass of sodium hydroxide, adding acrylic acid to the alkaline solution while stirring to obtain a partially neutralized acrylate solution, The ratio of the amount of sodium hydroxide to acrylic acid is 0.45:1, and the temperature is lowered to room temperature; add acrylamide, crosslinking agent, and initiator, and stir evenly to obtain a reaction solution, and react at 65°C for 10 minutes to obtain a solid gel (i.e. gel A, also a kind of low cross-linking degree gel) and then stop the reaction;

[0034] Wherein, the quality of acrylamide is 20% of the mass of acrylic acid; the cross-linking agent is ethylene glycol diacrylate, and the dosage is 0.03% of the mass of the added acrylic acid; the initiator is potassium persulfate, and the dosage is 0....

Embodiment 2

[0039] A preparation method of a double-crosslinked superabsorbent resin, comprising the following steps:

[0040] (1) dissolving sodium hydroxide in deionized water to obtain an aqueous solution (i.e. alkaline solution A) of 55% by mass of sodium hydroxide, adding acrylic acid to the alkaline solution while stirring to obtain a partially neutralized acrylate solution, The ratio of sodium hydroxide to acrylic acid is 0.35:1, and the temperature is lowered to room temperature; add acrylamide, crosslinking agent, and initiator, and stir evenly to obtain a reaction solution, and react at 70°C for 20 minutes to obtain a solid gel (i.e. gel A, also a kind of low cross-linking degree gel) and then stop the reaction;

[0041] Among them, the quality of acrylamide is 25% of the mass of acrylic acid; the crosslinking agent is N, N-methylenebisacrylamide, and the dosage is 0.01% of the mass of acrylic acid; the initiator is sodium persulfate, and the dosage is 0.01% of the mass of acrylic...

Embodiment 3

[0046] A preparation method of a double-crosslinked superabsorbent resin, comprising the following steps:

[0047] (1) Sodium hydroxide is dissolved in water to obtain an aqueous solution (i.e. alkaline solution A) of 55% by mass of sodium hydroxide, and acrylic acid is added to the alkaline solution while stirring to obtain a partially neutralized acrylate solution. The ratio of the amount of sodium to acrylic acid is 0.55:1, and the temperature is lowered to normal temperature; acrylamide, crosslinking agent, and initiator are added, and the reaction liquid is obtained by stirring evenly, and reacted at 60°C for 30 minutes to obtain a solid gel (ie Gel A, also a kind of low degree of cross-linking gel) stops reaction after;

[0048] Wherein, the quality of acrylamide is 15% of the mass of acrylic acid; the crosslinking agent is ethylene glycol diacrylate, and the consumption is 0.02% of the mass of acrylic acid; the initiator is sodium persulfate, and the consumption is 0.05...

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Abstract

The invention discloses a preparation method of double-crosslinking high-water-absorbability resin. The preparation method comprises the following steps: (1) adding acrylic acid into an alkali solution A; adding acrylamide, a crosslinking agent and an initiator; then reacting at 50 to 80 DEG C to obtain gel A; (2) immersing the gel A through a water solution of composite polyol; then reacting at 75 to 105 DEG C to obtain gel B; (3) immersing the gel B through an alkali solution B; then drying, crushing and sieving to obtain the double-crosslinking high-water-absorbability resin. The compositepolyol is prepared from one of ethylene glycol, propylene glycol and butylene glycol, and glycerol. Compared with the prior art, a product provided by the invention has the advantages of high normal saline absorption amount, pressurizing absorption amount and absorption speed; especially, the pressurizing absorption amount of the product is much higher than 30g / g in the prior art. The product haswater impermeability so that the product is suitable for being applied to fields with high requirements on the pressurizing absorption amount, such as meat freshness preservation and cold-chain storage and transportation.

Description

technical field [0001] The invention belongs to the field of resin materials, and in particular relates to a preparation method of a double-crosslinked superabsorbent resin. Background technique [0002] Superabsorbent resin is an important functional polymer material, which refers to a cross-linked polymer that can absorb water dozens or even thousands of times its own weight, and is widely used in sanitary materials, drought resistance and water retention, agriculture, forestry and gardening, biomedicine and other fields , with the continuous improvement of the level of science and technology and people's living standards, its application fields are constantly expanding, and gradually penetrate into various fields of industrial production and people's lives. In recent years, it has received more and more attention in the meat preservation and cold chain storage and transportation related industries. Superabsorbent resins are divided into two categories: natural and synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F222/14C08F222/38C08F8/14C08J3/24A23B4/20
Inventor 姚育忠姚致远傅培根何瀚辉
Owner 珠海得米新材料有限公司