Slump retaining agent and preparation method thereof

A technology of retaining agent and slump, which is applied in the field of slump retaining agent and its preparation, can solve the problems of uneven slump retaining properties of concrete, limited source of raw materials of slump retaining agent, affecting the construction performance of concrete, etc. Source, excellent slump retention performance

Active Publication Date: 2018-03-02
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Along with the wide application of slump retaining agent, its usage is increasing day by day, the synthetic raw material of existing slump retaining agent generally comprises polyether, initiator, chain transfer agent, reducing agent, small monomer and water, wherein, Polyether often chooses one or two or more of polyethylene glycol monomethyl ether, allyl polyoxyethylene ether, methallyl polyoxyethylene ether and methylbutenyl polyoxyethylene ether; Some slump retaining agents have limited sources of raw materials, and due to the differences in concrete composition, preparation technology and construction environment, the slump retaining agents have different performances on concrete and thus affect the construction performance of concrete; the existing slump The slump retaining agent can no longer meet the actual use requirements, so it is necessary to develop more slump retaining agent raw materials while ensuring the excellent performance of the slump retaining agent

Method used

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  • Slump retaining agent and preparation method thereof
  • Slump retaining agent and preparation method thereof
  • Slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw material components are as follows in parts by mass: 160 parts methallyl glycol polyoxyethylene ether, 1440 parts methallyl polyoxyethylene ether, 8 parts ammonium persulfate, 4 parts thioglycolic acid, 4 parts Ascorbic acid, 80 parts of acrylic acid, 20 parts of sodium hydroxide, 2284 parts of water;

[0025] Put the above 160 parts of methallyl glycol polyoxyethylene ether, the above 1440 parts of methallyl polyoxyethylene ether and 1067 parts of water into the reaction device, turn on the stirring and heating equipment to heat the reactants to 54°C, After the temperature reaches 54℃, stop heating, and obtain a polyether solution with a mass percentage of 60% after fully dissolving. Mix the above 4 parts of thioglycolic acid, the above 4 parts of ascorbic acid and 792 parts of water and stir evenly to obtain a mass percentage of 1% mixing agent solution, mixing the above 80 parts of acrylic acid and 53 parts of water to obtain a small monomer solution with a mass...

Embodiment 2

[0029] The raw material components are as follows in parts by mass: 360 parts methallyl glycol polyoxyethylene ether, 1440 parts methyl butenyl polyoxyethylene ether, 20 parts sodium persulfate, 9.6 parts mercaptopropionic acid, 8 Parts of sodium sulfite, 150 parts of acrylic acid, 50 parts of methacrylic acid, 40 parts of sodium hydroxide, 2348 parts of water;

[0030] Put the above 360 ​​parts of methallyl glycol polyoxyethylene ether, the above 1440 parts of methallyl polyoxyethylene ether and 771 parts of water into the reaction device, turn on the stirring and heating equipment to heat the reactants to 56°C, After the temperature is reached, the heating is stopped, and a polyether solution with a mass percentage of 70% is obtained after full dissolution. Mix the above 9.6 parts of mercaptopropionic acid, the above 8 parts of sodium sulfite and 569 parts of water, and stir evenly to obtain a mass percentage of 3 % Mixing agent solution, mixing the above 150 parts of acrylic a...

Embodiment 3

[0034] The raw material components are as follows in parts by mass: 825 parts of methallyl glycol polyoxyethylene ether, 425 parts of methallyl polyoxyethylene ether, 400 parts of methyl butenyl polyoxyethylene ether, 8.8 Parts of hydrogen peroxide, 4.4 parts of mercaptopropionic acid, 5.2 parts of sodium sulfite, 93 parts of acrylic acid, 7 parts of hydroxyethyl acrylate, 3.5 parts of hydroxypropyl acrylate, 3.5 parts of hydroxybutyl acrylate, 35.2 parts of sodium hydroxide and 2189.4 parts of water;

[0035] Put the above 825 parts of methallyl glycol polyoxyethylene ether, 425 parts of methallyl polyoxyethylene ether, 400 parts of methyl butenyl polyoxyethylene ether and 888 parts of water into the reaction device, and turn on Stirring and heating equipment heat the reactants to 55°C, stop heating when the temperature is reached, and obtain a polyether solution with a mass percentage of 65% after being fully dissolved. Mix 4.4 parts of mercaptopropionic acid, 5.2 parts of sodiu...

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Abstract

The invention discloses a slump retaining agent and a preparation method thereof, relates to the field of concrete admixtures, and solves the problem of limited raw material sources of the slump retaining agent. The raw material of the slump retaining agent of the present invention is composed of the following components in mass percentage: polyether 40%-45%, initiator 0.2%-0.5%, chain transfer agent 0.1%-0.24%, reducing agent 0.1% ‑0.2%, small monomer 2%‑5%, water 48.06%‑58.7%, alkali 0.5%‑1.0%; wherein, the polyether is methallyl glycol polyoxyethylene ether, or the The polyether is a mixture of methallyl glycol polyoxyethylene ether and methallyl polyoxyethylene ether and / or methylbutenyl polyoxyethylene ether. The slump retaining agent of the present invention has many optional raw materials and excellent performance.

Description

Technical field [0001] The invention relates to the field of concrete admixtures, in particular to a slump retaining agent and a preparation method thereof. Background technique [0002] As a building material, concrete is widely used in many fields. With the development of concrete, the rapid development of concrete admixture technology has also been promoted. Concrete admixtures are an indispensable component of concrete and are used in concrete production technology. The core role determines the quality of concrete. Among them, water reducing agent as an important concrete admixture can effectively improve the construction performance of concrete and increase the strength of concrete. Among many water reducing agents, polycarboxylic acid water reducing agent, as the third generation water reducing agent, has high water reducing rate, low dosage, environmental protection and the ability to maintain concrete slump. With the rapid development of my country's economy and construc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06
Inventor 白杰蔡阳王博
Owner CHINA BUILDING MATERIALS ACAD
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