Modified superabsorbent polymer, preparation method thereof and application thereof to cement-based material

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

Inactive Publication Date: 2016-09-07
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 structur

Method used

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  • Modified superabsorbent polymer, preparation method thereof and application thereof to cement-based material
  • Modified superabsorbent polymer, preparation method thereof and application thereof to cement-based material
  • Modified superabsorbent polymer, preparation method thereof and application thereof to cement-based material

Examples

Experimental program
Comparison scheme
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 preparation method of a modified superabsorbent polymer. The preparation method comprises a step of preparing an SAP (superabsorbent polymer) microemulsion under the action of ultrasonic to finally obtain a superabsorbent polymer product and a step of modifying the surface of the superabsorbent polymer by using a silane coupling agent to obtain the modified superabsorbent polymer. The invention further discloses the modified superabsorbent polymer prepared by the preparation method and application of the modified superabsorbent polymer to a cement-based material. When the modified superabsorbent polymer prepared by the preparation method is applied to the cement-based composite material, water-proof and anti-permeability characteristics of a concrete structure can be improved; the modified superabsorbent polymer has excellent water retention and quite high gel strength, so that even though the concrete structure is pressed, water is unlikely to be squeezed out and pores of the cement-based material are further blocked, so that the purposes of stopping water by using water as well as saving water are achieved; and after a long-time water-absorbing and water-releasing circulation, the durability of the concrete structure can still be ensured.

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 directly introduce water 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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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
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