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High-early strength type polycarboxylic acids dehydragent and preparation technique thereof

A technology of polycarboxylic acid series and preparation process, which is applied in the field of early-strength polycarboxylate series water reducer and its preparation process, can solve the problems of inability to obtain water reducing rate, slow strength development, long reaction time, etc., and achieve remarkable Enhance the effect early, improve the construction progress, and speed up the effect of formwork turnover

Inactive Publication Date: 2009-03-04
杭州传化建筑新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the early strength effect of the existing polycarboxylate superplasticizers is not completely satisfactory, especially the strength development in low temperature environment is slow
If the traditional inorganic salt or organic early strength agent is used to compound the polycarboxylate superplasticizer, not only is it easy to delaminate, the storage stability will deteriorate, and the dispersion performance of the polycarboxylate superplasticizer will be reduced
Chinese patent document CN101205128 discloses a formula of an early-strength polycarboxylate-based high-performance water-reducer and its manufacturing method. Although the above-mentioned technology has improved the early-strength performance of the polycarboxylate-based water-reducer to a certain extent, but Allyl polyoxyethylene ether is used in its formula, and because of the low reactivity of allyl polyoxyethylene ether, it is impossible to obtain a product with a high water-reducing rate; in addition, the manufacturing method uses a monomer dropping method, and the reaction The time is long, the production cost is high, and there are many by-products in the production process, which further affects the performance of the water reducer

Method used

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  • High-early strength type polycarboxylic acids dehydragent and preparation technique thereof
  • High-early strength type polycarboxylic acids dehydragent and preparation technique thereof
  • High-early strength type polycarboxylic acids dehydragent and preparation technique thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The composition and ratio of the monomers used are as follows:

[0031] 1) Monomer A: acrylic acid, accounting for 10% of the total monomer weight;

[0032] 2) Monomer B: its general structural formula is as follows

[0033]

[0034] R in the general formula 1 is a hydrogen atom, R 2 It is a methyl group; wherein n=20 monomer B accounts for 50% of the total monomer weight, and n=60 monomer B accounts for 35% of the total monomer weight;

[0035] 3) Monomer C: sodium allyl sulfonate, accounting for 3.5% of the total monomer weight;

[0036] 4) Monomer D: its general structure is as follows

[0037]

[0038] R in the general formula 3 is a hydrogen atom, R 4 is methyl, m 1 =40, m 2 =6; Monomer D accounted for 1.5% of the total monomer weight.

[0039] Two, the preparation process is as follows:

[0040] 1) According to the above ratio, monomer A, monomer B, monomer C and monomer D of two different numbers of chain members are added to the reaction kettl...

Embodiment 2

[0044] 1. The composition and ratio of the monomers used are as follows:

[0045] 1) Monomer A: acrylic acid, accounting for 7% of the total monomer weight;

[0046] 2) Monomer B: its general structural formula is as follows

[0047]

[0048] R in the general formula 1 is a hydrogen atom, R 2 It is a methyl group; wherein n=25 monomer B accounts for 45% of the total monomer weight, and n=50 monomer B accounts for 40% of the total monomer weight;

[0049] 3) Monomer C: sodium allyl sulfonate, accounting for 5.5% of the total monomer weight;

[0050] 4) Monomer D: its general structure is as follows

[0051]

[0052] R in the general formula 3 is a hydrogen atom, R 4 is methyl, m 1 =30, m 2 =3; Monomer D accounts for 2.5% of the total monomer weight.

[0053] Two, the preparation process is as follows:

[0054]1) According to the above ratio, monomer A, monomer B, monomer C and monomer D of two different numbers of chain members are added to the reaction kettle a...

Embodiment 3

[0058] 1. The composition and ratio of the monomers used are as follows:

[0059] 1) Monomer A: acrylic acid, accounting for 5% of the total monomer weight;

[0060] 2) Monomer B: its general structural formula is as follows

[0061]

[0062] R in the general formula 1 is a hydrogen atom, R 2 It is a methyl group; wherein n=30 monomer B accounts for 35% of the total monomer weight, and n=40 monomer B accounts for 50% of the total monomer weight;

[0063] 3) Monomer C: sodium allyl sulfonate, accounting for 7% of the total monomer weight;

[0064] 4) Monomer D: its general structure is as follows

[0065]

[0066] R in the general formula 3 is a hydrogen atom, R 4 is methyl, m 1 =20, m 2 =10; Monomer D accounted for 3% of the total monomer weight.

[0067] Two, the preparation process is as follows:

[0068] 1) According to the above ratio, monomer A, monomer B, monomer C and monomer D of two different numbers of chain members are added to the reaction kettle at...

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Abstract

The invention discloses a early-strength poly carboxylic acid system water reducing agent which is formed by the aqueous solution copolymerization of 5-10 percent of crylic acid or methacrylic acid, 35-50 percent of macrogol monoether acrylic monomers with two different chain numbers, 3-7 percent of sodium allylsulfonate or sodium methallyl sulfonate and 1-3 percent of polyether acrylic monomers with defoaming function. The early-strength poly carboxylic acid system water reducing agent has outstanding dispersion property and higher water-reducing property, and especially has obvious early-strength effect, the 1d compressive strength can reach 59.1 percent of the design strength, the gain in middle and later strength is stable, the form cycling rate is increased, and the construction progress is improved. Besides, the preparing process of the early-strength poly carboxylic acid system water reducing agent needs not to adopt the dripping manner, and the batch of all monomers is put into a reaction kettle for one-step reaction. The invention has the advantages of simple operation, short production period, low cost, and the like, and is applicable to the industrial scale production.

Description

technical field [0001] The present invention relates to an early-strength polycarboxylate water-reducer and a preparation process thereof, in particular to an early-strength polycarboxylate water-reducer applied to concrete components and a preparation process thereof. Background technique [0002] In China, due to the large-scale construction of infrastructure such as subways, water conservancy, and bridges, the demand for concrete components continues to grow. Concrete elements are formed by pouring concrete into molds and then transported to the construction site for assembly. In order to improve the production efficiency of the factory, it is necessary for the concrete members to be released from the mold in a short time, which requires the concrete to have a high early strength. [0003] In order to improve the early strength of concrete, speed up formwork turnover, and improve construction progress, technical approaches such as reducing the water-binder ratio, increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/30
CPCC04B24/2694C04B2103/302
Inventor 张鑫樊钧周南南叶光锐
Owner 杭州传化建筑新材料有限公司
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