Polycarboxylic acid polymer, preparation method and application thereof

A polymer and polycarboxylic acid technology, applied in the field of building materials preparation, can solve the problems of reduced grinding aid performance, low conversion rate, high viscosity of the system, etc., and achieve the effects of reducing surface energy, increasing content, and high reaction temperature

Active Publication Date: 2022-01-28
JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome defects such as the high viscosity of the system and the low conversion rate leading to the reduction of the grinding aid performance of the grinding aid when the polycarboxylate grinding aid is prepared by bulk polymerization in the prior art, thereby providing a kind of Polycarboxylate polymer and its preparation method and application

Method used

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  • Polycarboxylic acid polymer, preparation method and application thereof
  • Polycarboxylic acid polymer, preparation method and application thereof
  • Polycarboxylic acid polymer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0056] The present embodiment provides a kind of preparation method of polycarboxylic acid polymer, comprises the following steps,

[0057] (1) The preparation method of esterification monomer comprises the steps:

[0058] Add 18kg of acrylic acid and 17.7kg of monoethanol diisopropanolamine into the reactor, fill it with nitrogen while stirring, raise the temperature to 80°C, add 0.2kg of hydroquinone, stir for 20min, then add 0.15kg of concentrated sulfuric acid, and react at constant temperature 4h, after stopping the reaction, the unreacted acrylic acid was distilled off under reduced pressure to obtain the esterified monomer.

[0059] (2) Get above-mentioned 100g esterification monomer, 2.36kg acrylic acid and 174g mercaptopropionic acid (chain transfer agent), be mixed with mixed solution B;

[0060] Get 171g ammonium persulfate and 400g water in addition and be mixed with the second initiator solution C;

[0061] 52g L-ascorbic acid as the second reducing agent D.

...

Embodiment 2

[0065] The present embodiment provides a kind of preparation method of polycarboxylic acid polymer, comprises the following steps,

[0066] (1) The preparation method of esterification monomer comprises the steps:

[0067] Add 18kg of acrylic acid and 16.3kg of diethanol monoisopropanolamine into the reaction kettle, fill it with nitrogen while stirring, raise the temperature to 80°C, add 0.2kg of hydroquinone, stir for 20min, then add 0.15kg of concentrated sulfuric acid, and react at constant temperature 4h, after stopping the reaction, the unreacted acrylic acid was distilled off under reduced pressure to obtain the esterified monomer.

[0068] (2) Get above-mentioned 90g esterification monomer, 1.93kg acrylic acid and 174g mercaptopropionic acid (chain transfer agent), be mixed with mixed solution B;

[0069] Get 171g ammonium persulfate and 400g water in addition and be mixed with the second initiator solution C;

[0070] 52gL-ascorbic acid is the second reducing agent ...

Embodiment 3

[0074] The present embodiment provides a kind of preparation method of polycarboxylic acid polymer, comprises the following steps,

[0075] (1) The preparation method of esterification monomer comprises the steps:

[0076] Add 18kg of acrylic acid and 17.7kg of diethanol monoisopropanolamine into the reaction kettle, fill it with nitrogen while stirring, raise the temperature to 80°C, add 0.2kg of hydroquinone, stir for 20min, then add 0.15kg of concentrated sulfuric acid, and react at constant temperature 4h, after stopping the reaction, the unreacted acrylic acid was distilled off under reduced pressure to obtain the esterified monomer.

[0077] (2) Take the above-mentioned 150g esterified monomer, 2.9kg acrylic acid and 226g mercaptopropionic acid (chain transfer agent), and prepare mixed solution B.

[0078] Get 222g ammonium persulfate and 520g water in addition and be mixed with the first initiator solution C;

[0079] 59.8g of sodium bisulfite formaldehyde and 139g of...

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Abstract

The invention belongs to the technical field of building material preparation, and particularly relates to a polycarboxylic acid polymer, a preparation method and application thereof. The method comprises the following steps: (1) adding a polymerization inhibitor and part of unsaturated carboxylic acid into molten unsaturated polyether to form a mixed solution A; (2) preparing a mixed solution B from an esterification monomer and the residual unsaturated carboxylic acid; and (3) adding the mixed solution B into the mixed solution A, and performing bulk polymerization under the action of an initiator to obtain a polycarboxylic acid polymer, wherein in the step (3), inert gas is introduced in the early stage of the reaction, oxygen is introduced in the middle stage of the reaction, and inert gas is introduced in the later stage of the reaction. According to the invention, when the method is used for preparing the polycarboxylic acid polymer, the viscosity of a reaction system can be well controlled, the reaction rate is improved, the whole reaction process is stable, the molecular weight of the obtained polymer is narrow, and the effective content is increased; and the polycarboxylic acid polymer is used as a cement grinding aid, so that the grinding aid has good grinding aiding effect, water-reducing rate and early strength performance, and a solvent does not need to be added in the use process.

Description

technical field [0001] The invention belongs to the technical field of building material preparation, and in particular relates to a polycarboxylic acid polymer and its preparation method and application. Background technique [0002] my country is a big country that produces and consumes cement in the world, and its cement production accounts for more than 50% of the world's total cement production. During the cement grinding process, the cement grinding aid can be adsorbed on the surface of cement particles, reduce the surface energy of cement, overcome the attraction between cement, reduce crushing resistance, prevent balling and paste grinding, and at the same time improve the fluidity of cement , Improve the grinding process, increase the grinding efficiency, and reduce the power consumption of the mill. As a chemical additive, grinding aids can improve the distribution of cement particles and stimulate hydration power, thereby increasing the early strength and later s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/34C04B24/26C04B103/30C04B103/52
CPCC08F283/065C04B24/2694C04B2103/302C04B2103/52C08F220/06C08F220/34
Inventor 袁堂丰何新耀李玉博
Owner JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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