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

An internal and silane modification technology for concrete, applied in the field of concrete admixtures, can solve the problems of high water absorption rate, fast water absorption rate, and reduced concrete work performance, etc. The contradictory effects of sex and self-contraction

Active Publication Date: 2017-06-20
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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Embodiment 1

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

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

[0027] Dissolve 3.6g of polyvinyl alcohol 1788 completely in 87.1g of water, then add the above-mentioned neutralized acrylic acid solution, 0.18g of N,N'-methylenebisacrylamide and 1.08g of ammonium persulfate and mix well, after heating to 40°C React for 12 hours to obtain a superabsorbent resin gel, and obtain a 150-200 mesh superabsorbent resin after granulation, drying, crushing, sieving and surface crosslinking;

[0028] Disperse 25g of 3,4 epoxycyclohexylethyltrimethoxysilane in 75g of benzene, then add 50g of superabsorbent resin and mix thoroughly, put it in an oven at 120°C for 2 hours to obtain the final concrete internal curing agent.

Embodiment 2

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

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

[0032] Completely dissolve 10.8g of polyvinyl alcohol 1788 in 79.9g of water, then add the above-mentioned neutralized acrylic acid solution, 0.72g of N,N'-methylenebisacrylamide and 2.16g of potassium persulfate and mix well, after heating to 60°C React for 8 hours to obtain a superabsorbent resin gel, and obtain a 150-200 mesh superabsorbent resin after granulation, drying, crushing, sieving and surface crosslinking;

[0033] Disperse 40g of glycidyl etheroxypropyltrimethoxysilane in 120g of benzene, then add 50g of superabsorbent resin and mix thoroughly, put it in an oven at 160°C for 1 hour, and obtain the final concrete internal curing agent.

Embodiment 3

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

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

[0037] Completely dissolve 7.2g of polyvinyl alcohol 1788 in 23.5g of water, then add the above-mentioned neutralized acrylic acid solution, 0.45g of N,N'-methylenebisacrylamide and 1.62g of sodium persulfate and mix well, after heating to 50°C React for 10 hours to obtain a superabsorbent resin gel, and obtain a 150-200 mesh superabsorbent resin after granulation, drying, crushing, sieving and surface crosslinking;

[0038] Disperse 40g of glycidyl etheroxypropyltrimethoxysilane in 120g of benzene, then add 50g of superabsorbent resin and mix thoroughly, put it in an oven at 160°C for 1 hour, and 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: polyvinyl alcohol is completely dissolved 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 benzene, the superabsorbent resin is added to be sufficiently mixed, the mixture is put in an oven at the temperature of 120-160 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, in particular to a preparation method of a silane-modified concrete internal curing agent. Background technique [0002] The internal curing of concrete refers to adding water-absorbing materials to the concrete to form a micro-reservoir inside the concrete. When the relative humidity inside the concrete drops, it can slowly release water to the surroundings to supplement its internal water consumption and maintain the internal humidity of the concrete. 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 continuously release water during the hydration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/38C08F8/42C04B24/26
Inventor 李磊张小磊刘加平王文彬李全龙田倩王伟李明
Owner JIANGSU SOBUTE NEW MATERIALS
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