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A cement-modified superabsorbent resin and its preparation method

A superabsorbent resin and cement modification technology, which is applied in the field of cement modified superabsorbent resin, can solve the problems of SAP premature water release, achieve the effects of reducing water release, reducing osmotic pressure difference, and increasing gel strength

Active Publication Date: 2021-12-17
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of premature water release of SAP and improve the internal maintenance effect of SAP, the invention provides a modified superabsorbent resin for concrete

Method used

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  • A cement-modified superabsorbent resin and its preparation method
  • A cement-modified superabsorbent resin and its preparation method
  • A cement-modified superabsorbent resin and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) 2g of cement was added to 400g of water, under nitrogen atmosphere, the temperature was controlled at 30°C, and stirred for 72 hours to obtain the desired cement suspension.

[0039] 2) Under stirring conditions, slowly add 70g of acrylic acid, and then add 30g of acrylamide.

[0040] 3) Add 0.2 g of potassium persulfate and 0.2 g of N,N'-methylenebis(meth)acrylamide, and stir for 10 minutes to obtain a reaction solution.

[0041] 4) The above reaction solution was transferred to a 75°C water bath, and continued to stir until the system became viscous, then stopped stirring for another 2 hours.

[0042] 5) The gel obtained above is dried and crushed to obtain the final SAP product of the present invention.

Embodiment 2

[0044] 1) 2g of cement was added to 230g of water, under nitrogen atmosphere, the temperature was controlled at 30°C, and stirred for 72 hours to obtain the required cement suspension.

[0045] 2) Under stirring conditions, slowly add 50g of acrylic acid, and then add 50g of acrylamide.

[0046] 3) Add 0.4g of ammonium persulfate and 0.2g of N,N'-methylene bis(meth)acrylamide, and stir for 10 minutes to obtain a reaction solution.

[0047] 4) The above reaction solution was transferred to a 60°C water bath, and continued to stir until the system became viscous, then stopped stirring and reacted for another 3 hours.

[0048] 5) The gel obtained above is dried and crushed to obtain the final SAP product of the present invention.

Embodiment 3

[0050] 1) 2g of cement was added to 150g of water, under nitrogen atmosphere, the temperature was controlled at 30°C, and stirred for 72 hours to obtain the desired cement suspension.

[0051] 2) Under stirring conditions, slowly add 30g of acrylic acid, and then add 70g of acrylamide.

[0052] 3) Add 0.8g of ammonium persulfate and 0.2g of N,N'-methylene bis(meth)acrylamide, and stir for 10 minutes to obtain a reaction solution.

[0053] 4) The above reaction solution was transferred to a 50°C water bath, and continued to stir until the system became viscous, then stopped stirring and reacted for another 4 hours.

[0054] 5) The gel obtained above is dried and crushed to obtain the final SAP product of the present invention.

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Abstract

The invention provides a cement-modified superabsorbent resin, which is to introduce cement suspension in the synthesis process of SAP resin. After the synthesis of SAP resin, the cement suspension can form micro-nano cement / hydration inside the SAP resin. product particles. The cement-modified superabsorbent resin of the present invention introduces salt similar to the cement environment inside the SAP, reduces the amount of water released by the SAP before the cement sets, and improves the internal maintenance effect of the SAP.

Description

technical field [0001] The invention relates to a cement-modified superabsorbent resin suitable for application in the field of cement concrete. Background technique [0002] Traditional concrete maintenance basically uses methods such as sprinkling, spraying or covering the concrete surface with moisturizing film. However, in high-strength concrete with low water-to-binder ratio, due to high compactness, water cannot penetrate from the outside to the inside of the concrete structure, so the effect of traditional external maintenance methods very limited. [0003] In addition, for some types of concrete, traditional external curing methods are also difficult to implement, such as: [0004] 1) Due to the large size of the concrete structure of hydraulic mass concrete, the concrete in the center of the structure is basically in a moisture-proof state; [0005] 2) Since the steel pipe concrete is completely sealed by the steel pipe, it cannot obtain the water required for mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F222/38C08F220/20C08F222/14C04B24/26
CPCC08F220/06C08F220/56C08F220/20C04B40/0039C04B24/2688C04B2103/0051C08F222/385C04B22/00
Inventor 王文彬刘加平储阳王瑞王育江姚婷
Owner JIANGSU SOBUTE NEW MATERIALS
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