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A kind of preparation method of ester type highly dispersed high slump retention polycarboxylate water reducer

A high-dispersion, polycarboxylic acid technology, applied in the field of building admixtures, can solve the problems of slump, concrete slump loss, concrete slump loss and other problems that cannot be fundamentally solved, and achieves good initial dispersion performance, Ease of construction and pumping, improved dispersion performance

Active Publication Date: 2020-06-05
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a long time, the use of concrete has been plagued by the problem of how to effectively control the slump loss
The pumped concrete produced from the concrete mixing plant often needs long-distance transportation, and the construction environment is different, which will inevitably lead to the loss of concrete slump, which will affect the construction of concrete
Although its slump retention ability can be improved by adding retarders such as sodium gluconate, sucrose or organic phosphate, it cannot fundamentally solve the problem of slump loss
However, most slow-release polycarboxylate superplasticizers have a low initial water-reducing rate and too fast a slow-release speed, which often causes bleeding and segregation in long-distance mixer trucks, causing great difficulties in the construction process.

Method used

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  • A kind of preparation method of ester type highly dispersed high slump retention polycarboxylate water reducer
  • A kind of preparation method of ester type highly dispersed high slump retention polycarboxylate water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Esterification reaction: add 70.80g of maleic anhydride, 110.00g of polyether diol with a molecular weight of 400, and 2.10g of hydroquinone into the first reaction vessel for mixing, and heat up to 60-80°C under nitrogen protection. ℃, then add 3.66g p-toluenesulfonic acid, raise the temperature to 100℃, keep the temperature for 2 hours, remove water during the reaction, cool down to room temperature after the reaction, and obtain the first mixture containing esterification product and unreacted unsaturated acid anhydride.

[0026] (2) Copolymerization: In the second reaction vessel, add 12.00g of the first mixture prepared in step (1), 80.00g of methoxypolyethylene glycol propylene glycol acrylate with a molecular weight of 1200 and 20.00g of isoamylene with a molecular weight of 3000 Alcohol polyethylene glycol ether, and 118.00g of water, stirred until uniformly dissolved to obtain a comonomer mixture solution, then added 0.80g of hydrogen peroxide, and mixed asc...

Embodiment 2

[0029] (1) Esterification reaction: Add 42.2g of itaconic anhydride, 160.00g of polyether diol with a molecular weight of 800, and 2.66g of phenothiazine into the first reaction vessel for mixing, and heat up to 60-80°C under nitrogen protection , and then added 4.25g of benzenesulfonic acid, raised the temperature to 120°C, kept the temperature for 2h, removed water during the reaction, and cooled down to room temperature after the reaction, to obtain the first mixture containing the esterification product and unreacted unsaturated anhydride.

[0030] (2) Copolymerization: In the second reaction vessel, add 10.00g of the first mixture, 90.00g of methoxypolyethylene glycol methacrylate with a molecular weight of 3000 and 10.00g of isopentyl with a molecular weight of 2400 in the second reaction vessel Enol polyethylene glycol ether, and 127.00g of water, stirred until dissolved evenly, to obtain a comonomer mixture solution, and ammonium persulfate aqueous solution (wherein, am...

Embodiment 3

[0033] (1) Esterification reaction: Add 51.68g of succinic anhydride, 210.00g of polyether diol with a molecular weight of 1000, and 3.60g of diphenylamine into the first reaction vessel and mix them. Add 3.30 g of 98% concentrated sulfuric acid, raise the temperature to 110° C., keep the temperature for 2 hours, remove water during the reaction, and cool down to room temperature after the reaction to obtain the first mixture containing the esterification product and unreacted unsaturated anhydride.

[0034](2) Copolymerization: In the second reaction vessel, add 15.00g of the first mixture prepared in step (1), 85.00g of methoxypolyethylene glycol acrylate with a molecular weight of 3000 and 15.00g of isopentenol with a molecular weight of 1200 Polyethylene glycol ether, and 120.00g water, stir until dissolving evenly, obtain the comonomer mixture solution, and the aqueous solution of trichosanthes (wherein, trichosanthes 0.35g, water 30.00g), mercaptopropionic acid aqueous so...

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Abstract

The invention discloses a preparation method of an ester type high-dispersity and high-slump-retaining polycarboxylic acid water reducer. The preparation method comprises the following steps: (1) carrying out esterification reaction; (2) carrying out copolymerization reaction; (3) carrying out neutralization reaction. According to the preparation method disclosed by the invention, unsaturated acidanhydride and polyether diol are esterified to obtain an esterified product containing carboxyl and multi-ester groups; the ester groups in a molecular structure are gradually hydrolyzed under an alkaline condition of cement slurry to release the carboxyl with a water reducing effect, so that the slump-retaining performance is improved; the esterified product with an ester and ether copolymerizedtype side chain, an esterified monomer and isopentenol polyethylene glycol ether are copolymerized to form a polyester and polyether type side chain, a polyester type side chain and a polyether typeside chain which have different lengths; long and short side chains with different types are organically combined, so that the steric hindrance effect can be increased and the initial dispersion performance is improved; the ester type high-dispersity and high-slump-retaining polycarboxylic acid water reducer also has a good slump degree retaining capability and also has a certain air entraining effect.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an ester-type highly dispersed and high slump polycarboxylate water reducer. Background technique [0002] In today's world, social economy is developing vigorously, urban construction is advancing by leaps and bounds, followed by the rapid rise of construction related to transportation, water and electricity, municipal administration, etc., the continuous emergence of high-rise buildings and the improvement of construction material construction requirements, the reliability of concrete The requirements for pumpability are getting higher and higher, and high-efficiency water reducers are an essential part of pumping, and polycarboxylate water reducers have become an important part of it. However, for a long time, the use of concrete has been troubled by how to effectively control the slump loss. The pumped concrete produced from th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/26C08F290/06C08F220/06C08F220/18C08F220/14C08F220/20C08F2/38C08F2/10C04B103/30
CPCC04B24/165C04B2103/302C08F2/10C08F2/38C08F283/065C08F290/062C08F220/1804
Inventor 赖华珍方云辉赖广兴李格丽麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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