Preparation method of superabsorbent resin and application of superabsorbent resin in reducing moisture content of muck

A technology of super absorbent resin and dregs, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of throwing and dripping, reducing the moisture content of dregs, and decreasing the water absorption rate, so as to reduce the moisture content and improve the water retention. , the effect of facilitating outbound transportation

Inactive Publication Date: 2019-11-08
BEIJING MUNICIPAL CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of cross-linking agent is the main factor affecting the cross-linking density. The more the cross-linking agent is used, the higher the cross-linking density and the lower the water absorption rate. However, when the cross-linking density is too low, the molecular chain of the water-absorbing resin lacks enough water Binding force, the water absorption ratio decreases instead
The invention relates to a preparation method of a superabsorbent resin. The prepared superabsorbent resin is poured into a muck pool and evenly mixed with shield muck to quickly reduce the moisture content of the muck and solve the problem of shield muck at the present stage. There is the problem of spilling and dripping during transportation, and the gel can bind soil particles, which is easy to stack and will not cause landslides

Method used

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  • Preparation method of superabsorbent resin and application of superabsorbent resin in reducing moisture content of muck
  • Preparation method of superabsorbent resin and application of superabsorbent resin in reducing moisture content of muck

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of a superabsorbent resin, the steps are as follows: Hydroxide is neutralized with acrylic acid to prepare an acrylic acid monomer solution, and under the action of a crosslinking agent, an initiator, a catalyst, cellulose and a surfactant, it is polymerized by crosslinking React to prepare superabsorbent resin.

[0027] As a preferred solution of this embodiment, it specifically includes the following steps:

[0028] A. In an ice-water bath, slowly drop a certain amount of hydroxide aqueous solution into acrylic acid, and the degree of neutralization is 40%, to obtain an aqueous solution of acrylate monomer containing acrylate and part of acrylic acid;

[0029] B, cellulose is mixed with a certain amount of distilled water, surfactant is added in the process of stirring, and heating obtains transparent aqueous solution;

[0030] C. Add the aqueous solution of acrylic acid monomer prepared in step A dropwise to the transparent solution prepared in ...

Embodiment 2

[0044] A preparation method of a superabsorbent resin, the steps are as follows: acrylic acid monomer solution is prepared by neutralizing hydroxide with acrylic acid, and prepared by polymerization reaction under the action of crosslinking agent, initiator, catalyst, cellulose and surfactant The preparation method of superabsorbent resin.

[0045]As a preferred solution of this embodiment, it specifically includes the following steps:

[0046] A. In an ice-water bath, slowly drop a certain amount of aqueous hydroxide solution into acrylic acid, and the degree of neutralization is 90%, to obtain an aqueous solution of acrylic acid monomer containing acrylate and acrylic acid;

[0047] B, cellulose is mixed with a certain amount of distilled water, surfactant is added in the process of stirring, and heating obtains transparent aqueous solution;

[0048] C. Add the aqueous solution of acrylic acid monomer prepared in step A dropwise to the transparent solution prepared in step ...

Embodiment 3

[0062] A preparation method of a superabsorbent resin, the steps are as follows: acrylic acid monomer solution is prepared by neutralizing hydroxide with acrylic acid, and prepared by polymerization reaction under the action of crosslinking agent, initiator, catalyst, cellulose and surfactant The preparation method of superabsorbent resin.

[0063] As a preferred solution of this embodiment, it specifically includes the following steps:

[0064] A. In an ice-water bath, slowly drop a certain amount of aqueous hydroxide solution into acrylic acid, the degree of neutralization is 60%, to obtain an aqueous solution of acrylic acid monomer containing acrylate and acrylic acid;

[0065] B, cellulose is mixed with a certain amount of distilled water, surfactant is added in the process of stirring, and heating obtains transparent aqueous solution;

[0066] C. Add the aqueous solution of acrylic acid monomer prepared in step A dropwise to the transparent solution prepared in step B u...

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Abstract

The invention relates to the technical field of shield construction, in particular to a preparation method of a superabsorbent resin, which comprises the following steps: an acrylate monomer solutionis prepared by neutralizing acrylic acid with a hydroxide, and the superabsorbent resin is prepared by polymerization under the action of a cross-linking agent, an initiator, a catalyst, cellulose anda surfactant. The superabsorbent resin is prepared, and the cellulose with good hydrophilicity is introduced to maintain water content and protect gel, methoxy and hydroxypropoxy groups are uniformlydistributed along the cellulose molecular chain, thus the ability of association of oxygen atoms on hydroxyl and ether bonds with water to synthesize hydrogen bonds can be improved, so that free water is changed into bound water, and the water retention of the water-absorbent resin is improved; and the superabsorbent resin can be poured into a muck tank and mixed with shield muck uniformly so asto rapidly reduce the moisture content of the muck, outward transportation is convenient, the gel can bind soil particles, piling up is easy and landslide is not caused.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a preparation method of a superabsorbent resin and its application in reducing the moisture content of slag. Background technique [0002] In the construction of subway tunnels with shield method, in order to make the dregs have better flow plasticity, it is necessary to add water, bentonite, foam and other substances to the dregs excavated on the tunnel face. Finally, the muck generated during the shield excavation process is poured into the muck pool through the soil bin, screw machine, belt, battery car and gantry crane. Due to the existence of a large amount of water, bentonite, foam and other additives, the water content in the excavated dregs is relatively high, which is very easy to cause spilling and dripping during the process of transportation. However, in order to meet the construction schedule, the construction unit had to directly load the muck with a high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/06C08F222/38C08F290/06B01J20/26B01J20/30
CPCB01J20/267C08F251/02C08F290/062C08F220/06C08F222/385
Inventor 孔恒郭飞姜瑜张丽丽田治州董凯李贺高胜雷王凯丽孙博通郝亮林雪冰王渭王亚杰
Owner BEIJING MUNICIPAL CONSTR
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