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Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same

A technology of cement concrete and polycarboxylate, applied in the field of polycarboxylate antifreeze

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the current cement concrete antifreeze based on naphthalene-based high-efficiency water reducer or melamine, the present invention determines the principle and performance of preparing polycarboxylic acid-based antifreeze based on the mechanism of action of antifreeze and a large number of experimental studies The goal is to invent a polycarboxylate antifreeze agent for cement concrete with better performance than existing antifreeze agents

Method used

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  • Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same
  • Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same
  • Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Carry out the synthesis of methacrylic polycarboxylate superplasticizer with reference to the following steps:

[0021] The first step of esterification reaction: add 80 grams of methoxypolyethylene glycol with a molecular weight of M=2000 in the reaction kettle, heat and stir, and control the temperature at 120°C, add 1.29 grams of hydroquinone as a polymerization inhibitor, and react for 15 minutes , and then 25.8 grams of methacrylic acid, 5.08 grams of p-toluenesulfonic acid, and 24.0 grams of cyclohexane were subjected to an esterification reaction; Polyethylene glycol methacrylate.

[0022]The second step of polymerization reaction: put the macromonomer obtained in the first step reaction into a four-necked flask, add 69.87 grams of water after heating and melting, heat up the water bath to 57 ° C, and add 1.47 grams of thioglycolic acid in sequence after fully stirring and dissolving. Add 7.1 grams of dilute amide and 25.92 g of an aqueous solution of 5% concent...

Embodiment 2

[0025] Carry out the synthesis of acrylic polycarboxylate superplasticizer according to the following steps:

[0026] The first step of esterification reaction: add 100 grams of methoxypolyethylene glycol with a molecular weight of M=1000 in the reaction kettle, heat and stir until fully melted, and control the temperature at 130 ° C, add 0.014 grams of hydroquinone as a polymerization inhibitor, and react After 15 minutes, 14.4 grams of acrylic acid, 1.14 grams of p-toluenesulfonic acid, and 23 grams of cyclohexane were subjected to esterification in sequence; after 4.5 hours of constant temperature reaction, the aqueous agent cyclohexane was removed by vacuuming to obtain a large single Bulk methoxypolyethylene glycol acrylate.

[0027] The second step of polymerization reaction: put the macromonomer obtained in the first step reaction into a four-necked flask, add 150.52 grams of water after heating and melting, raise the temperature to 65°C, stir and dissolve it, and then ...

Embodiment 3

[0030] According to Example 2, the acrylic polycarboxylic acid high-efficiency water reducer was synthesized, and the obtained 40.0% solution was diluted to 30.0%. Weigh 100 grams of 30.0% acrylic polycarboxylic acid superplasticizer solution and add it to a stainless steel container, then add 20 grams of triisopropanolamine and 10 grams of glycerol successively under stirring; simultaneously weigh 710ml of water and add it to the In a stainless steel container, weigh 100 grams of sodium thiocyanate and 60 grams of calcium formate, add them to the container of weighed water in turn under stirring, stir well until the solids are uniformly dissolved, then add them to the solution prepared in the first step, and stir evenly After standing still until clarified, a light yellow homogeneous liquid product with a solid content of 22.0% and a pH value of 8.2 is obtained.

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Abstract

The invention relates to poly carboxylic acid system antifreeze applied to cement concrete and a preparation method thereof and belongs to the building material field. The antifreeze is prepared by the optimal combination of an efficient water reduce of poly carboxylic acid, organic alcohol amine, low-carbon alcohol, sulfocyanide and formate. The preferred proportion of the components is that the efficient water reducer to the organic alcohol amine to the low-carbon alcohol to the sulfocyanide to the calcium formate to water is equal to (3.0-8.0) to (0.5-2.0) to (0.0-2.0) to (10.0-20.0) to (0.0-6.0) to (65.0-75.0) (by mass percentage). Compared with the existing antifreeze, the antifreeze of the system has the advantages of high water reducing rate and comparatively good workability and quick growth of strength at negative temperature. The antifreeze has the advantages of low intermingled quantity in the cement concrete, good water solubility, low alkali content, high strength at the early stage and at the later stage of the cement concrete but no chlorine and is applicable to the preparation of various cement concrete at the negative temperature ranging from negative 5 DEG C to negative 20 DEG C in winter in the north area.

Description

technical field [0001] The present invention relates to a polycarboxylate antifreeze agent for cement concrete. Compared with traditional antifreeze agents, it has significant advantages such as low alkali and no chlorine, excellent performance and environmental protection. It is composed of polycarboxylate high-efficiency water reducer and The mixture of organic and inorganic salts belongs to the technical field of building materials. Background technique [0002] The winter concrete construction temperature in the vast northern regions of our country is mostly below 0°C, and the lowest winter temperature in the northeast and northwest regions sometimes reaches minus 20-30°C. If the temperature drops below the freezing point of concrete hydration water, the hydration water will freeze and affect the concrete hydration process. The strength development will not meet the age requirements, and the ice expansion stress will cause the internal structure of the concrete to be dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B24/12C04B24/02C04B22/14C04B24/04
CPCC04B2103/601C04B40/0039
Inventor 王子明孙俊兰明章崔素萍王亚丽
Owner BEIJING UNIV OF TECH
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