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
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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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