Slushing agent for concrete and preparation method thereof

A technology of concrete water reducer and hydroxypropyl methylcellulose, which is applied in the field of concrete water reducer and its preparation, and can solve the problems of poor slump retention ability, reduced concrete quality, and rapid concrete collapse of high-efficiency water reducer.

Active Publication Date: 2013-03-20
SHANDONG HONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the concentration of residual high-efficiency superplasticizer in concrete decreases too fast, which leads to the rapid collapse of concrete, which has become an engineering problem that needs to be solved urgently.
The method to solve this kind of problem is to adjust the mixing ratio of each component, increase the amount of polycarboxylate superplasticizer or use s

Method used

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  • Slushing agent for concrete and preparation method thereof
  • Slushing agent for concrete and preparation method thereof
  • Slushing agent for concrete and preparation method thereof

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preparation example Construction

[0033] According to the present invention, the present invention also provides the preparation method of the above-mentioned concrete water reducing agent, comprising the following steps:

[0034] Under the catalysis of acetate, maleic anhydride and hydroxypropyl methylcellulose are reacted for the first time in glacial acetic acid to obtain hydroxypropylmethylcellulose monomaleate;

[0035] Free radical polymerization of methallyl polyoxyethylene ether, acrylic acid solution and the hydroxypropyl methylcellulose monomaleate under a redox initiation system to obtain a concrete water reducer.

[0036] In the process of preparing the concrete water reducer, the present invention first uses maleic anhydride to modify hydroxypropyl methylcellulose to prepare hydroxypropyl methylcellulose monomaleate monomer, and then hydroxypropyl methylcellulose Free radical polymerization of methyl cellulose monomaleate, methallyl polyoxyethylene ether and acrylic acid to obtain polyether concre...

Embodiment 1

[0047] Example 1 Preparation of hydroxypropylmethylcellulose monomaleate (MAPMC) monomer

[0048] In a dry round bottom flask equipped with a reflux condenser, add 80ml of glacial acetic acid and 2.5g of pre-dried hydroxypropylmethylcellulose (HPMC), control the temperature at 90°C, and stir for 1h. After heating up to the desired temperature, 5.0 g of maleic anhydride and 1.2 g of anhydrous sodium acetate were added. After incubation for 5 hours, terminate the reaction with 30ml of deionized water, then add 3ml of concentrated hydrochloric acid, and shake well. Slowly pour the reactants into a large amount of excess 60°C deionized water while stirring mechanically to obtain a white flocculent polymer. The polymer was filtered with a filter cloth, and the product was washed with deionization at 60°C until neutral. Vacuum-dry the washed product at about 50°C and pulverize to obtain hydroxypropylmethylcellulose monomaleate (MAPMC).

Embodiment 2

[0050] 8.5g of acrylic acid and 1.5g of water were made into monomer aqueous solution, 0.3g of mercaptoacetic acid, 0.1134g of ascorbic acid and 27.6g of water were made into initiator water solution for later use; 71.5g of TPEG2400, 0.4g MAPMC, 0.3g hydrogen peroxide (30wt%) and 85.6g deionized water, heated and stirred to 45°C. Use a constant flow pump to control the dropping time according to a certain dropping rate, and drop the acrylic acid monomer mixed aqueous solution and the initiator mixed aqueous solution within 3.0 hours and 3.5 hours respectively at a constant speed. After the initiator was added dropwise, the insulation reaction was carried out for 1.5h. After the reaction, cool naturally, and adjust the pH value to 6~7 with 60g of 40% NaOH solution to obtain MAPMC modified polyether water reducer PC01 with a solid content of about 40%.

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Abstract

The invention provides a preparation method of a slushing agent for concrete. The preparation method comprises the following steps in sequence: implementing the first reaction between maleic anhydride and hydroxypropyl methyl cellulose in glacial acetic acid under the catalysis of acetate, so as to obtain the hydroxypropyl methyl cellulose monomaleate; and carrying out free radical polymerization between methyl allyl polyoxyethylene ether, acrylic acid solution and hydroxypropyl methyl cellulose monomaleate under an oxidentive-reductive initiation system, so as to obtain the slushing agent for concrete. According to the slushing agent for concrete, prepared by the preparation method provided by the invention, the molecular structure contains the hydroxypropyl methyl cellulose molecular structure unit, so that the macromolecules of the slushing agent can be entangled with each other to form a net-shaped structure to wrap cement and water for effectively preventing the moisture in the mortar from evaporating, and as a result, the slump keeping property is good. The invention also provides the slushing agent for concrete, and the slushing agent for concrete has the structure as shown in formula (1).

Description

technical field [0001] The invention relates to the technical field of concrete additives, in particular to a concrete water reducer and a preparation method thereof. Background technique [0002] In the operation of cement mixture, in order to make the operation labor-saving and effective, early demoulding shortens the construction period, the cement mixture is required to have high fluidity, and at the same time, the cement mixture can effectively inhibit the loss of slump, and there is sufficient early stage of hardening. Strength, which requires a high-performance concrete water reducer. Concrete water reducer refers to an admixture that can reduce the amount of mixing water and increase the amount of concrete under the condition of the workability of concrete and the amount of cement unchanged. It hinders or destroys the flocculation structure of particles, so that the workability and strength of concrete can be guaranteed while saving the amount of cement. With the d...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/30
Inventor 赵洪义付新建朱化雨张战营朱孔赞李成武闫圣娟殷俊峰张秋艳
Owner SHANDONG HONGYI TECH
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