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A kind of superabsorbent polymer and preparation method thereof

A technology of water-absorbent polymer and polymer particles, applied in the field of super-absorbent polymer and its preparation, can solve the problem that the comprehensive performance cannot meet the requirements, etc., and achieve the effect of increasing the liquid penetration rate and penetration depth, and the liquid absorption rate is fast

Active Publication Date: 2022-04-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a superabsorbent polymer (SAP) with improved performance and a preparation method thereof for the prior art that has an overall performance that cannot meet the requirements when preparing a superabsorbent polymer. The method makes the obtained SAP resin The surface cross-linking effect is enhanced, which can ensure the excellent pressurization performance and liquid absorption rate of SAP resin while improving its liquid permeability.

Method used

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  • A kind of superabsorbent polymer and preparation method thereof
  • A kind of superabsorbent polymer and preparation method thereof
  • A kind of superabsorbent polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Preparation of SAP resin particles:

[0123] Mix 550g of prepared acrylic acid aqueous solution with a concentration of 60wt%, 640g of deionized water, 0.85g of pentaerythritol triallyl ether, and 1.6g of polyethylene glycol diacrylate in a 2L polymerization kettle, and cool down to 5°C in an ice bath , use nitrogen to remove oxygen for 10min, add 2g H to the polymerization kettle 2 o 2 Aqueous solution (diluted to a concentration of 2wt%), 2g 2,2'-azobis (N, N-dimethyleneisobutyramide) dihydrochloride solution (diluted to a concentration of 4wt%) and 2.5g of 2wt% ascorbic acid aqueous solution and mixed (in the polymerization aqueous solution, the concentration of the monomer is 27.5wt%); After the induction period ends, when the temperature begins to rise significantly, the polymerization reaction starts, and the temperature reaches about 85°C after about 1.5 hours of reaction, and then Continue to heat-preserve and ripen for 5 hours to obtain a hydrogel-like polyme...

Embodiment 2

[0129] Preparation of SAP resin particles:

[0130] Operating procedure is referring to the step that embodiment 1 prepares SAP resin particle, and difference is:

[0131] The mass of deionized water added was 550 g (in the aqueous polymerization solution, the monomer concentration was 29.7 wt%).

[0132] SAP particles without surface crosslinking are defined as polymer powder b.

[0133] Carry out surface cross-linking treatment to polymer raw powder b:

[0134] Weigh 100g of polymer powder b, atomize a mixture of 0.1g of gallic acid epoxy resin, 2g of 1,2-propylene glycol and 6g of deionized water, spray evenly on the surface of the particles of polymer powder b, and The polymer particles are fluidized in air with continuous mixing. Then the mixed polymer particles were placed in a high-temperature blast oven and heated at 150° C. for 1 h to carry out surface cross-linking treatment.

[0135] Cool the polymer particles after surface crosslinking to below 40°C, then atomi...

Embodiment 3

[0137] Preparation of SAP resin particles:

[0138] Operating procedure is referring to the step that embodiment 1 prepares SAP resin particle, and difference is:

[0139] During the polymerization stage, the mass of pentaerythritol triallyl ether added was replaced by 1.2 g (that is, the degree of internal crosslinking was increased).

[0140] The SAP particles without surface crosslinking are defined as polymer raw powder c.

[0141] Carry out surface cross-linking treatment to polymer raw powder c:

[0142] Weigh 100g of the original polymer powder c, atomize a mixture of 0.2g of gallic acid epoxy resin, 3.3g of 1,2-propylene glycol and 6g of deionized water, and spray evenly on the surface of the particles of the original polymer powder c, The polymer particles are fluidized in air and mixed continuously. Then the mixed polymer particles were placed in a high-temperature blast oven and heated at 130° C. for 1.5 h to carry out surface cross-linking treatment.

[0143] C...

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Abstract

The present invention relates to a superabsorbent polymer, in particular to a superabsorbent polymer and a preparation method thereof. The preparation method comprises the following steps: at ≤ 20°C, an ethylenically unsaturated monomer containing a carboxyl group and / or its Salt, oxidizing agent, reducing agent and internal crosslinking agent containing double bond compound are contacted to initiate a polymerization reaction to obtain a hydrogel; after the hydrogel is crushed and extruded, it is contacted with a neutralizing agent for neutralization reaction to obtain colloidal particles ; After the colloidal particles are dried, ground and sieved, the surface crosslinking treatment is carried out by contacting with a surface crosslinking agent to obtain a superabsorbent polymer resin; wherein, the surface crosslinking agent includes at least gallic acid epoxy resin . The method of the invention enhances the surface cross-linking effect of the obtained SAP resin, and while improving its liquid-through performance, it can ensure the excellent pressurization performance and liquid absorption rate of the SAP resin.

Description

technical field [0001] The invention relates to a superabsorbent polymer, in particular to a superabsorbent polymer with improved properties and a preparation method thereof. Background technique [0002] Superabsorbent Polymers (SAP, Superabsorbent Polymers) is a synthetic polymer material capable of absorbing about 500 times to about 1000 times its own weight of water, which can be widely used in hygienic products, such as children's disposable diapers, feminine hygiene Supplies, adult diapers, etc. In the future, as the trend of global aging is further strengthened, its market demand will have a large space. [0003] At present, the known materials for sanitary products are mainly polyacrylic acid and its sodium salt series products, of which about 95% are prepared by aqueous solution polymerization process, and about 5% are prepared by reverse suspension process. The aqueous polymerization process is divided into two categories: one is the belt process, which is genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L33/02C08L71/02C08K3/30C08F283/06C08F220/06C08F216/12
CPCC08J3/246C08F283/065C08J2333/02C08J2471/02C08K2003/3081C08F220/06
Inventor 王晓纪学顺刘懿平丁明强王刚赵帅赵镇田云马磊贾海东孙家宽
Owner WANHUA CHEM GRP CO LTD