Defoaming type polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of defoaming type polycarboxylic acid water reducing agent and its preparation, can solve the problems of poor compatibility, poor placement stability, poor effect of controlling gas content, etc.

Pending Publication Date: 2021-04-27
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor compatibility and poor placement stability caused by the combination of polycarboxylate water reducer and defoamer mentioned in the above background technology, the problem of poor control of gas content

Method used

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  • Defoaming type polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0030] The invention provides a preparation method of a defoaming polycarboxylate water reducer, which specifically comprises the following steps:

[0031] 1. Preparation of the first polymer:

[0032] In terms of weight fractions, 300-400 parts by weight of unsaturated polyoxyethylene ether monomer with a molecular weight of 600-3000, 5.0-20.0 parts by weight of acrylate monomer, 1.0-3.0 parts by weight of oxidant and 200-260 parts by weight Parts of water are mixed and heated to obtain solution A;

[0033] 30.0-60.0 parts by weight of unsaturated carboxylic acid, 0.3-3.0 parts by weight of reducing agent and 150-220 parts by weight of water are formulated into solution B;

[0034] 1.0-4.0 parts by weight of chain transfer agent and 20-30 parts by weight of water are formulated into solution C;

[0035] Put solution A in a 250ml four-neck flask, stir and heat to 40-65°C, add solution B and solution C dropwise into solution A respectively, the dropping time is 1.5-3 hours, k...

Embodiment 1

[0045] 1. Preparation of the first polymer:

[0046] 350 parts by weight of methallyl polyoxyethylene ether with a molecular weight of 2500, 15.0 parts by weight of methyl acrylate, 2.3 parts by weight of oxidant ammonium persulfate and 220 parts by weight of water were mixed and heated to obtain solution A;

[0047] 45.0 parts by weight of crotonic acid and 1.3 parts by weight of reducing agent sodium formaldehyde sulfoxylate and water of 190 parts by weight are made into solution B;

[0048] The chain transfer agent mercaptoethanol of 3.0 parts by weight and the water of 25 parts by weight are made into solution C;

[0049] Put solution A in a 250ml four-neck flask, stir and heat to 60°C, add solution B and solution C dropwise into solution A respectively, the dropping time is 2h, keep warm for 1.5h after the dropping, and carry out the copolymerization reaction; The pH value is adjusted to 6.0 and the solid content is adjusted to 40% by using liquid caustic soda with a mas...

Embodiment 2

[0055] 1. Preparation of the first polymer:

[0056] 300 parts by weight of allyl polyoxyethylene ether with a molecular weight of 1000, 8.0 parts by weight of methyl acrylate, 1.5 parts by weight of oxidant hydrogen peroxide and 200 parts by weight of water were mixed and heated to obtain solution A;

[0057] 30.0 parts by weight of acrylic acid, 0.5 parts by weight of reducing agent ascorbic acid and 150 parts by weight of water are formulated into solution B;

[0058] The chain transfer agent thioglycolic acid of 1.5 parts by weight and the water of 20 parts by weight are made into solution C;

[0059] Put solution A in a 250ml four-neck flask, stir and heat to 50°C, add solution B and solution C dropwise to solution A respectively, the dropping time is 1.5h, keep warm for 1h after the dropping, and carry out the copolymerization reaction; The pH value is adjusted to 6.5 with 30-32% mass concentration of liquid caustic soda, and the solid content is adjusted to 40%. A fir...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to a defoaming type polycarboxylate superplasticizer and a preparation method thereof. The defoaming type polycarboxylate superplasticizer is prepared from a first esterification product and hydrogen-containing silicone oil through hydrosilation reaction. The first esterification product is prepared by esterifying a first polymer and grafting the first polymer with an unsaturated polyoxyethylene ether monomer. The first polymer is prepared from an unsaturated polyoxyethylene ether monomer, an acrylate monomer and unsaturated carboxylic acid through a copolymerization reaction. The defoaming type polycarboxylate superplasticizer provided by the invention has the functions of defoaming and foam inhibition while having a high water reducing effect, is high in defoaming capacity and good in stability, and effectively avoids the problem of poor gas content control effect caused by poor compatibility of compounding of the polycarboxylate superplasticizer and the defoaming agent and poor placement stability.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a defoaming polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of high water reducing rate, adjustable molecular structure and environmental protection. With the development of the concrete industry and the improvement of various performance requirements of concrete, polycarboxylate superplasticizers have been widely and rapidly applied. [0003] With the wide application of polycarboxylate superplasticizers, the problem of air content caused by polycarboxylate superplasticizers in the application process has also become a difficulty that plagues the industry. It is inevitable to introduce air bubbles in concrete configuration and construction. Among them, air bubbles with a diameter below 50nm can significantly improve the frost resistance, impermeability, and durability o...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/14C08F220/04C08F220/06C08G81/02C08G77/46C04B24/42C04B103/30
CPCC08F283/065C08G81/025C08G77/46C04B24/42C04B2103/302
Inventor 邵幼哲吴传灯李格丽方云辉钟丽娜
Owner KZJ NEW MATERIALS GROUP CO LTD
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