Super absorbent resin with lower liquid absorbing rate, and preparation method and application thereof

A technology of super absorbent resin and liquid absorption rate, applied in the field of super absorbent resin, can solve problems such as hindering application and reducing concrete work performance, and achieve the effect of reducing impact

Active Publication Date: 2013-05-22
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When SAP is used in traditional fields such as sanitary materials and agricultural water retention, it needs to have a high liquid absorption ratio and a high liquid absorption rate (liquid absorption ratio: the mass ratio of the superabsorbent resin after it is saturated with liquid to the dry state; liquid absorption rate: per unit time However, when it is used as a concrete internal maintenance water diversion material, high liquid absorption rate and high liquid absorption rate will make SAP absorb too much mixing water in the early stage, resulting in a significant decrease in the working performance of concrete, which in turn hinders SAP application in this

Method used

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  • Super absorbent resin with lower liquid absorbing rate, and preparation method and application thereof
  • Super absorbent resin with lower liquid absorbing rate, and preparation method and application thereof
  • Super absorbent resin with lower liquid absorbing rate, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 125g of an aqueous solution containing 80% acrylic acid is neutralized with 230g of a 34% NaOH solution. This process needs to be carried out slowly so that the temperature does not exceed 30°C, and then 1.1g of potassium persulfate and 2.9g of 1,4-butanediol diacrylate are added. Stir evenly and place it at 65°C for 2 hours to react. The obtained gel is dried and pulverized to obtain irregularly shaped SAP particles.

Embodiment 2

[0032] 125g of an aqueous solution containing 80% acrylic acid is neutralized with 230g of a 34% NaOH solution. This process needs to be carried out slowly so that the temperature does not exceed 30°C, and then 1.1g of potassium persulfate and 2.9g of 1,4-butanediol diacrylate are added. The reaction solution after stirring evenly was added to 533 g of cyclohexane dissolved with 0.8% SPAN80, the stirring rate was controlled at 200 rpm / min, and the reaction solution was placed at 65°C for 2 hours, filtered and dried to obtain spherical SAP particles.

Embodiment 3

[0034] 62.5g aqueous solution containing 80% acrylic acid is neutralized with 115g 34% NaOH solution, the process needs to be carried out slowly so that the temperature does not exceed 30°C, then add 0.55g potassium persulfate, 0.58g 1,4-butanediol diacrylate , Stir the reaction liquid a evenly, add 533g of cyclohexane dissolved with 0.8% SPAN80 (Span-80), control the stirring rate at 200rpm / min, and place it at 65°C for reaction;

[0035] When the previous steps take place, neutralize 62.5g of an aqueous solution containing 80% acrylic acid with 115g of a 34% NaOH solution, the process needs to be carried out slowly so that the temperature does not exceed 30°C, then add 0.55g of potassium persulfate, 2.32g1, 4-butanediol diacrylate, the reaction liquid b after stirring evenly.

[0036] The reaction solution b was slowly dropped into the reaction solution a which had been reacted for 1 hour, and then reacted at 65° C. for another 2 hours after the dropwise addition, and finall...

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Abstract

The invention discloses super absorbent resin with lower liquid absorbing rate. The resin comprises the raw materials of monomer aqueous solution, an initiator and a crosslinking agent, wherein the crosslinking agent comprises an ester crosslinking agent which is one of ethylene glycol diacrylate, ethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, propylene glycol diacrylate, propylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate, 1, 4-butanediol diacrylate, 1, 4-butanediol dimethacrylate, 1, 3-butanediol diacrylate or 1, 3-butanediol dimethacrylate or a mixture of more than two thereof. The super absorbent resin with slowly increased liquid absorbing capability disclosed by the invention absorbs little water in an early stage to reduce influence to workability of concrete, while has a certain water absorbing capacity in a later stage so as to ensure that concrete is maintained by enough water.

Description

technical field [0001] The present invention relates to a superabsorbent resin with slow liquid absorption rate, its preparation method and its application. Background technique [0002] Super absorbent resin (SAP) is a functional polymer material that can absorb hundreds or even thousands of times its own weight of water. It is widely used because of its strong water absorption capacity and its ability to withstand a certain pressure without leakage. It is used in soil water retention materials, hygiene materials such as sanitary paper and diapers, and in recent years, it is also used in construction materials such as waterproof materials and concrete. [0003] Based on the liquid absorption characteristics of SAP, it can be used for internal curing of concrete (WO / 2001 / 002317) to reduce the shrinkage of high-performance concrete. When SAP is used in traditional fields such as sanitary materials and agricultural water retention, it needs to have high liquid absorption rati...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/14C08F222/38C08F2/10C08F2/32
Inventor 刘加平王文彬李磊田倩
Owner JIANGSU SOBUTE NEW MATERIALS
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