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Ketene concrete glue reducing agent and preparation method thereof

A technology of ketene and concrete, which is applied in the field of ketene concrete reducer and its preparation, can solve the problems of side reactions, unstable effect of reducer, and no obvious improvement in the strength of concrete in the later stage, so as to reduce free energy, Reduce secondary agglomeration and good cement dispersion

Active Publication Date: 2020-11-06
浙江鑫美博新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent application publication CN110845672A, a polycarboxylic acid-based concrete adhesive reducer is reported, which is produced by polymerization of polyether macromonomers, unsaturated carboxylic acids, modified alcohol amines, etc., and often occurs in the actual preparation process. Side reactions occur, resulting in unstable effect of the glue reducer, and this kind of glue reducer is only compatible with polycarboxylate water reducer, which limits its scope of use
[0005] Patent application publication CN110903435A reports a glue reducer and its preparation method, which uses a common water reducer in the market as a matrix to form a polymer with a high molecular structure under the action of an unsaturated carboxylic acid and a sugar compound. It does improve the early strength of concrete, but does not significantly improve the later strength of concrete

Method used

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  • Ketene concrete glue reducing agent and preparation method thereof
  • Ketene concrete glue reducing agent and preparation method thereof
  • Ketene concrete glue reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of ketene type concrete reducer and preparation method thereof, comprising the following raw materials in weight percentage:

[0030]

[0031] The preparation method of a ketene-based concrete glue reducer according to the present invention is realized by the following steps: 1) adding diketene, dimethacrylic acid, and ethylene glycol into a reflux reaction tank, starting to stir and gradually heating up, Finally, the temperature was raised to 110°C, and the heating time was controlled at 40 minutes;

[0032] 2) After the temperature is raised to 110°C, start to drop 1 part of ammonium persulfate solution with a mass percentage concentration of 6% in the solution system, control the dropping speed, and ensure that the dropping time is 2 hours, and the temperature of the solution system remains constant during the dropping process. Keep constant, continue the constant temperature reaction for 5 hours after the dropwise addition;

[0033] 3) After the polymeriz...

Embodiment 2

[0035] A kind of ketene type concrete reducer and preparation method thereof, comprising the following raw materials in weight percentage:

[0036]

[0037] The preparation method of a ketene-based concrete glue reducer according to the present invention is realized by the following steps: 1) adding diketene, dimethacrylic acid, and ethylene glycol into a reflux reaction tank, starting to stir and gradually heating up, Finally, the temperature was raised to 120°C, and the heating time was controlled at 40 minutes;

[0038] 2) After the temperature is raised to 120°C, start to drop 1.5 parts of ammonium persulfate solution with a mass percent concentration of 6% in the solution system, control the rate of addition, and ensure that the addition time is 2.5 hours, and the temperature of the solution system remains constant during the addition process. Keep constant, continue the constant temperature reaction for 4 hours after the dropwise addition;

[0039] 3) After the polym...

Embodiment 3

[0041] A kind of ketene type concrete reducer and preparation method thereof, comprising the following raw materials in weight percentage:

[0042]

[0043] The preparation method of a ketene-based concrete adhesive reducer according to the present invention is realized by the following steps: 1) adding methyl ketene, dimethacrylic acid, and ethylene glycol into the reflux reaction tank, starting to stir and gradually heating up , and finally raised the temperature to 115°C, and controlled the heating time to 35 minutes;

[0044] 2) After the temperature is raised to 115°C, start to drop 1.2 parts of ammonium persulfate solution with a mass percent concentration of 5% in the solution system, control the rate of addition, and ensure that the addition time is 2 hours, and the temperature of the solution system remains constant during the addition process. Keep constant, continue the constant temperature reaction for 4.5 hours after the dropwise addition;

[0045] 3) After th...

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Abstract

The invention discloses a ketene concrete glue reducing agent and a preparation method thereof. The ketene concrete glue reducing agent is prepared from the following substances in parts by weight: 8-25 parts of dimethylacrylic acid, 8-20 parts of ketene monomer, 3-10 parts of ethylene glycol, 2-8 parts of retarder, 0.5-3 parts of initiator and the balance of water. According to the invention, theworking performance of the concrete can be improved, specifically, the cement can be more fully dispersed in the concrete, and the utilization rate of the cement is higher so that the early strengthand the later strength of the concrete are remarkably improved; in addition, the later toughness and the crack resistance of the concrete are also improved. Because the glue reducing agent has the effects of improving the strength and crack resistance of the concrete, on the premise of keeping the strength of the concrete unchanged in engineering operation, the cement consumption of concrete per unit volume can be reduced, and the service life of a concrete building is prolonged so that the engineering cost is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a ketene-based concrete adhesive reducer and a preparation method thereof. Background technique [0002] In recent years, my country's construction industry has achieved unprecedented development. With the renewal and improvement of infrastructure, the scale of construction has never been greater. Concrete among building materials has been widely used in civil engineering construction due to its abundant raw materials, low price, simple production process, and wide range of compressive strength grades. Cement is the main component of concrete and also the most expensive part of concrete. According to a large number of studies, there are still 10% to 15% of cement in concrete that has not been completely dispersed and hydrated, resulting in the inability to fully play its due role. If the hydration rate of cement can be increased, it will save a lot of engineering cos...

Claims

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Application Information

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IPC IPC(8): C08F220/04C08F224/00C04B24/26
CPCC08F220/04C08F224/00C04B24/26Y02W30/91
Inventor 徐锋
Owner 浙江鑫美博新材料有限公司
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