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Aqueous solution retarder

A technology of retarder and water agent, which is applied in the field of water agent retarder, can solve the problems of additive types and high addition amount, environmental pollution, etc., and achieve improvement and improvement of mechanical properties, good adaptability, improvement and easy sexual effect

Inactive Publication Date: 2019-03-01
南京友西科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a water-based retarder to solve the environmental pollution caused by the high types and amounts of additives added in order to improve the retarding effect of the water-reducing agent in the prior art.

Method used

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  • Aqueous solution retarder

Examples

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Effect test

Embodiment 1

[0028] An aqueous retarder, in parts by weight, the retarder includes polycarboxylate water reducer 70, sodium tripolyphosphate 1, citric acid 5, sodium nitrite 1 and calcium enhancer 1, the The weight ratio of calcium hydroxide, calcium oxide and calcium carbonate in the calcium enhancer is 20:30:1. The preparation steps of the polycarboxylate water reducer are:

[0029] 1) Add methallyl polyoxyethylene ether into a three-necked flask, heat and stir to 40°C;

[0030] 2) Add 30% hydrogen peroxide solution, drop in thioglycolic acid solution, after 5 minutes, slowly add fumaric acid solution for 3 hours, ammonium persulfate solution for 3.5 hours, and keep 40°C for 1.5 hours after the dropwise addition;

[0031] 3) After the reaction is finished, wait for the reaction product to cool down, add 30% sodium hydroxide solution, adjust the pH value to neutral, and obtain a light yellow viscous polymer copolymer solution, that is, a polycarboxylate superplasticizer.

[0032] Mix th...

Embodiment 2

[0034] An aqueous retarder, in parts by weight, the retarder includes polycarboxylate water reducer 75, sodium tripolyphosphate 5, citric acid 10, calcium nitrite 2 and calcium enhancer 5, the The weight ratio of calcium hydroxide, calcium oxide and calcium carbonate in the calcium enhancer is 30:40:10. The preparation steps of the polycarboxylate water reducer are:

[0035] 1) Add methallyl polyoxyethylene ether into a three-necked flask, heat and stir to 40°C;

[0036] 2) Add 30% hydrogen peroxide solution, drop in thioglycolic acid solution, after 5 minutes, start to slowly add itaconic acid solution for 3 hours, ammonium persulfate solution for 3.5 hours, and keep it at 40°C for 1.5 hours after the dropwise addition;

[0037] 3) After the reaction is finished, wait for the reaction product to cool down, add 30% sodium hydroxide solution, adjust the pH value to neutral, and obtain a light yellow viscous polymer copolymer solution, that is, a polycarboxylate superplasticize...

Embodiment 3

[0040] An aqueous retarder, in parts by weight, said retarder includes polycarboxylate water reducer 80, sodium hexametaphosphate 6, citric acid 15, methanol 3 and calcium enhancer 7, said retarder The weight ratio of calcium hydroxide, calcium oxide and calcium carbonate in the calcium preparation is 30:40:15. The preparation steps of the polycarboxylate water reducer are:

[0041] 1) Add methallyl polyoxyethylene ether into a three-necked flask, heat and stir to 40°C;

[0042] 2) Add 30% hydrogen peroxide solution, drop in thioglycolic acid solution, after 5 minutes, slowly add methacrylic acid solution for 3 hours, potassium persulfate solution for 3.5 hours, keep 40°C for 1.5 hours after dropping;

[0043]3) After the reaction is finished, wait for the reaction product to cool down, add 30% sodium hydroxide solution, adjust the pH value to neutral, and obtain a light yellow viscous polymer copolymer solution, that is, a polycarboxylate superplasticizer.

[0044] Mix the ...

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Abstract

The invention provides an aqueous solution retarder. The aqueous solution retarder is prepared from, by weight, 70-85 parts of a polycarboxylate superplasticizer, 1-10 parts of polyphosphate, 5-20 parts of organic acids, 1-5 parts of an anti-freezing agent and 1-10 parts of a calcium increasing agent, wherein the polyphosphate refers to sodium hexametaphosphate or sodium tripolyphosphate, and thecalcium increasing agent refers to calcium hydroxide, calcium oxide and calcium carbonate. The problem of environmental pollution caused by adding of various auxiliary agents in high quantity due to apurpose of improving a retarding function of a water reducing agent in the prior art is solved. A product has advantages of high slump loss resistance, high water reducing rate, high strength, retarding and the like, concrete workability is improved, various mechanical performances of concrete are improved, and high adaptability to various types of cement is achieved. Concrete prepared from the aqueous solution retarder is free of surface bleeding line and bubbles, low in color difference and high in appearance quality, low environment temperature influences are realized, convenience in construction is achieved, and a preparation method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to an aqueous retarder. Background technique [0002] Concrete admixtures, referred to as admixtures for short, refer to substances that are added to improve the performance of concrete before or during the mixing of concrete. Because admixtures can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries, and their application in engineering has attracted more and more attention, becoming an indispensable material in concrete. Retarder is an admixture that can prolong the setting time of concrete. Retarder is mainly used to delay the hydration and hardening speed of cement, so that fresh concrete can maintain plasticity for a long time, so as to facilitate the transportation and pouring of concrete. and vibration; it can delay the appearance time of the hydration temperature peak, reduce the hydration temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/22
CPCC04B40/0039C04B2103/22C04B24/267C04B22/16C04B24/06C04B22/085C04B22/064C04B24/026
Inventor 王晓芳盛思仲缪海燕黄雪鹿立云
Owner 南京友西科技集团股份有限公司
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