A kind of preparation method of silane modified concrete internal curing agent

A technology of silane modification in concrete, applied in the field of concrete admixture, which can solve the problems of high water absorption rate, lower concrete work performance, fast water absorption rate, etc., to achieve lower water absorption rate, easy control of chemical structure, and delay absorption of mixing water The effect of the rate

Active Publication Date: 2018-02-23
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the water absorption rate of the existing concrete internal curing agent is too high, the water absorption rate is too fast, and the working performance of the concrete is greatly reduced, the invention provides a preparation method of a silane-modified concrete internal curing agent

Method used

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  • A kind of preparation method of silane modified concrete internal curing agent

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Effect test

Embodiment 1

[0025] A preparation method of a silane-modified concrete internal curing agent includes the following steps:

[0026] Add 53.3g of 30% sodium hydroxide solution to 36g of acrylic acid to prepare an acrylic acid solution with a neutralization degree of 80%;

[0027] Disperse 3.6g of nano-montmorillonite completely in 87.1g of water, then add the neutralized acrylic acid solution, 0.18g of N,N'-methylenebisacrylamide and 1.08g of ammonium persulfate and mix well, then heat to 40℃ React for 12 hours to obtain a super absorbent resin gel, which is granulated, dried, pulverized, sieved and surface cross-linked to obtain a 150-200 mesh super absorbent resin;

[0028] Disperse 25g of dodecyltrimethoxysilane in 75g of ethanol, then add 50g of super absorbent resin to fully mix, and put it in a 100°C oven to react for 2h to obtain the final concrete internal curing agent.

Embodiment 2

[0030] A preparation method of a silane-modified concrete internal curing agent includes the following steps:

[0031] Add 53.3g of 30% sodium hydroxide solution to 36g of acrylic acid to prepare an acrylic acid solution with a neutralization degree of 80%;

[0032] Disperse 10.8g of nano-kaolin completely in 79.9g of water, then add the neutralized acrylic acid solution, 0.72g of N,N'-methylenebisacrylamide and 2.16g of potassium persulfate to mix, heat to 60℃ and react for 8h , To obtain a super absorbent resin gel, after granulation, drying, crushing, screening and surface crosslinking to obtain a 150-200 mesh super absorbent resin;

[0033] Disperse 40 g of hexadecyltrimethoxysilane in 120 g of ethanol, add 50 g of super absorbent resin and mix thoroughly, and put it in a 140° C. oven to react for 1 hour to obtain the final concrete internal curing agent.

Embodiment 3

[0035] A preparation method of a silane-modified concrete internal curing agent includes the following steps:

[0036] Add 53.3g of 30% sodium hydroxide solution to 36g of acrylic acid to prepare an acrylic acid solution with a neutralization degree of 80%;

[0037] Disperse 7.2g of nano attapulgite in 23.5g of water, then add the neutralized acrylic acid solution, 0.45g of N,N'-methylenebisacrylamide and 1.62g of sodium persulfate and mix well, then heat to 50℃ React for 10 hours to obtain a super absorbent resin gel, which is granulated, dried, pulverized, sieved and surface cross-linked to obtain a 150-200 mesh super absorbent resin;

[0038] Disperse 40g of octadecyltrimethoxysilane in 120g of ethanol, then add 50g of super absorbent resin to fully mix, put it in a 140°C oven and react for 1h to obtain the final concrete internal curing agent.

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Abstract

The invention provides a preparation method of a silane modified concrete internal curing agent. The preparation method comprises steps as follows: inorganic clay is completely dispersed in deionized water, a neutralized acrylic acid solution, a cross-linking agent and an initiator are added and uniformly mixed, the mixture is heated to 40-60 DEG C and reacts for 8-12 h, superabsorbent resin gel is obtained and subjected to granulation, drying, crushing, screening and surface crosslinking, and superabsorbent resin is obtained; a silane coupling agent is dissolved in ethanol, the superabsorbent resin is added to be sufficiently mixed, the mixture is put in an oven at the temperature of 100-140 DEG C and reacts for 1-2 h, and the final concrete internal curing agent is obtained. According to the method, a preparation process is simple and convenient, a chemical structure is easy to control, the prepared internal curing agent has a lower water absorption rate, influence of the internal curing agent on workability of concrete can be reduced, the early self-constriction and reduction effect of the concrete is improved, and the problem of early cracking of the concrete is solved.

Description

Technical field [0001] The invention belongs to the technical field of concrete admixtures, and particularly relates to a preparation method of a silane-modified concrete internal curing agent. Background technique [0002] The internal curing of concrete refers to the addition of water-absorbing materials to the concrete to form a micro-reservoir inside the concrete. When the relative humidity inside the concrete decreases, it can slowly release water to the surroundings, supplement its internal water consumption, and maintain the internal humidity of the concrete to slow down the self The drying effect, which can solve the problem of early shrinkage and cracking caused by the low water-cement ratio of high performance concrete, has very important theoretical and practical significance. [0003] Super absorbent resin (SAP) is a new type of polymer material that can absorb water hundreds or even thousands of times its own weight. When used as an internal curing agent, it can contin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/04C04B24/42
Inventor 张小磊李磊刘加平王文彬李全龙田倩王育江王伟
Owner JIANGSU SOBUTE NEW MATERIALS
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