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Modified superabsorbent polymer and its preparation method and application in cement-based materials

A cement-based material and super-absorbent technology, applied in the field of cement-based materials, can solve the problems of interface damage, reduced water absorption rate, irregular and uniform particle shape, etc., achieve regular and uniform particle shape, improve early hydration degree, and excellent water retention performance. Effect

Inactive Publication Date: 2018-05-15
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional SAP preparation of rigid cement-based waterproof materials has the following problems: 1) the traditional SAP has a high liquid absorption rate in distilled water, but in salt water (such as NaCl solution, CaCl 2 solution), the water absorption rate will be greatly reduced, making it poor in salt tolerance, and the water absorption rate will be significantly reduced in the ion-containing solution. In the actual application process, this type of water-absorbing resin mainly absorbs water containing electrolytes.
Especially when it is applied to offshore structures, the use effect will be greatly affected
2) Although general superabsorbent materials have a significant impact on the working performance of cement-based materials, it is difficult to obtain ideal high-performance waterproof cement-based materials due to large water-absorbing particles and irregular and uniform particle shapes.
3) Under the action of long-term water absorption expansion, water release or water pressure of SAP, the interface between SAP and cement substrate will be damaged, which will affect the waterproof, impervious and other durable properties of cement structures.

Method used

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  • Modified superabsorbent polymer and its preparation method and application in cement-based materials
  • Modified superabsorbent polymer and its preparation method and application in cement-based materials
  • Modified superabsorbent polymer and its preparation method and application in cement-based materials

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: In a four-necked bottle, with deionized water as the dispersed phase, add 2 parts by weight of phenethylphenol polyoxyethylene ether, 2 parts by weight of sodium dodecylbenzenesulfonate, 1 part by weight of n- Butanol, 0.5 parts by weight (NH 4 ) 2 S 2 o 8 The initiator and 0.5 parts by weight of N,N'-methylenebisacrylamide are stirred and mixed to form a homogeneous soap liquid. In a four-necked flask with a water bath temperature of 60°C, under the protection of nitrogen, 100 parts by weight of mixed monomers were added dropwise within half an hour. In the mixed monomers, the content of acrylic acid neutralized by NaOH was 68%, and the content of acrylamide 12%, sodium styrene sulfonate content 10%, 2-acrylamido-2-methylpropanesulfonic acid content 10%, turn on the ultrasonic wave, react for 1 hour, and prepare SAP microemulsion. After finishing the reaction, the product was dried to obtain a crude product. The obtained crude product was put into di...

Embodiment 2

[0033] Embodiment 2: In a four-necked bottle, with deionized water as the dispersed phase, add 1 weight part of phenethylphenol polyoxyethylene ether, 2 weight parts of sodium dodecylbenzenesulfonate, 1 weight part of n- Butanol, 0.7 parts by weight (NH 4 ) 2 S 2 o 8The initiator and 0.3 parts by weight of N,N'-methylenebisacrylamide are stirred and mixed to form a homogeneous soap liquid. In a four-necked flask with a water bath temperature of 50°C, under the protection of nitrogen, 100 parts by weight of mixed monomers were added dropwise within half an hour. In the mixed monomers, the content of acrylic acid neutralized by NaOH was 80%, and the content of acrylamide 10%, sodium styrene sulfonate content 5%, 2-acrylamido-2-methylpropanesulfonic acid content 5%, turn on the ultrasonic wave, react for 1.5h, and prepare SAP microemulsion. After finishing the reaction, the product was dried to obtain a crude product. The obtained crude product was put into distilled water, ...

Embodiment 3

[0035] Embodiment 3: In a four-necked bottle, with deionized water as the dispersed phase, add 2 parts by weight of phenethylphenol polyoxyethylene ether, 3 parts by weight of sodium dodecylbenzenesulfonate, 2 parts by weight of n- Butanol, 0.5 parts by weight (NH 4 ) 2 S 2 o 8 The initiator and 0.5 parts by weight of N,N'-methylenebisacrylamide are stirred and mixed to form a homogeneous soap liquid. In a four-necked flask with a water bath temperature of 50°C, under the protection of nitrogen, 100 parts by weight of mixed monomers were added dropwise within half an hour. In the mixed monomers, the content of acrylic acid neutralized by NaOH was 75%, and the content of acrylamide 10%, 7% sodium styrene sulfonate, and 8% 2-acrylamido-2-methylpropanesulfonic acid, turned on the ultrasonic wave, and reacted for 1.2 hours to prepare the SAP microemulsion. After finishing the reaction, the product was dried to obtain a crude product. The obtained crude product was put into di...

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Abstract

The invention discloses a method for preparing a modified superabsorbent polymer. The method includes the steps of preparing SAP microemulsion under the action of ultrasound, and finally obtaining a superabsorbent polymer product, and using silane coupling on the surface of the superabsorbent polymer. The step of modifying the coupling agent to obtain a modified superabsorbent polymer. The invention also discloses the modified superabsorbent polymer prepared by the method and the application of the modified superabsorbent polymer in cement-based materials. When the modified superabsorbent polymer prepared by the present invention is used in cement-based composite materials, it can not only improve the waterproof and anti-seepage characteristics of concrete structures; Squeeze out to further block the pores of cement-based materials to achieve the purpose of stopping water and saving water; it can also ensure its durability after long-term water absorption-release cycles.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, in particular to a modified superabsorbent polymer, a preparation method thereof and an application in cement-based materials. Background technique [0002] High-performance cement-based materials (HPC) are usually obtained by low water-cement ratio technology. Therefore, it is easy to produce large autogenous shrinkage and cause structural cracking. At the same time, the hydration of incompletely hydrated cement in the later stage will also cause wet expansion and cracking. The key to solving the above problems is to increase the relative humidity inside the HPC to promote cement hydration. However, HPC usually has a dense structure, and it is difficult to introduce curing water from the outside by conventional curing methods. Therefore, some scholars proposed to introduce water directly into HPC for self-curing. Among them, superabsorbent polymer (SAP) is a commonly used intern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F220/58C08F212/14C08F222/38C08F2/26C08F2/30C04B28/02C04B14/06C04B24/22
CPCC04B24/22C04B24/2652C04B28/02C08F2/26C08F2/30C08F220/06C04B14/06C08F220/56C08F220/585C08F212/14C08F222/385
Inventor 刘杰胜李发平董莪余媛媛邢珊珊刘肖凡何翔
Owner WUHAN POLYTECHNIC UNIVERSITY