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A kind of preparation method of polycarboxylate concrete water reducer

A concrete water-reducing agent and polycarboxylic acid-based technology, which is applied in the field of concrete admixture preparation, can solve problems such as the reduction of water-reducing rate, and achieve the effects of reduced adsorption, promotion of physical adsorption, and outstanding slow-release effect.

Active Publication Date: 2018-07-24
陕西诚润德高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 1. The adaptability of polycarboxylate superplasticizers to cementing materials. In engineering applications, it is manifested that different cements do not use fly ash. Polycarboxylate superplasticizers also have adaptability problems, especially for fly ash. It is "picky", and the adaptability of finely ground mineral powder is better
[0014] 2. The mud content of the sand. When the mud content of the sand is high, the water reducing rate of the polycarboxylate water reducer will be significantly reduced.
[0015] 3. Concrete slump retention problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the polycarboxylate concrete water reducing agent of the present embodiment comprises the following steps:

[0038] Step 1, 14.9g triethanolamine is warmed up to 70 ℃, then is divided into 3 times and added maleic acid in the triethanolamine after the temperature rise, stirs reaction, after the temperature stabilizes, add 0.27mL concentrated sulfuric acid (chemically pure) in reaction mass, Stirring reaction 8h, obtain functional monomer; The total addition amount of described maleic acid is 11.6g;

[0039] Step 2. Put 62g of monomer and 62g of water in the reactor, heat up to 40°C and stir for 40 minutes, then add the initiator dropwise to the reactor under the condition of heat preservation and stirring; the monomer is allyl alcohol poly Oxyethylene ether; The initiator material is made by mixing 0.062g initiator and 0.93g water; The initiator is ammonium persulfate;

[0040] Step 3, mixing 0.062g initiator reducing agent, 0.248g chain trans...

Embodiment 2

[0046] The preparation method of the polycarboxylate concrete water reducing agent of the present embodiment comprises the following steps:

[0047] Step 1, 14.9g triethanolamine is warmed up to 100 DEG C, then in the triethanolamine after the temperature rise, maleic acid is added in 4 times, stirred and reacted, after the temperature is stabilized, 1.14mL concentrated sulfuric acid (chemically pure) is added to the reaction mass, Stirring reaction 3h, obtains functional monomer; The total addition amount of described maleic acid is 23.2g;

[0048] Step 2. Put 35g of monomer and 30g of water in the reactor, heat up to 50°C and stir for 20 minutes, then add the initiator dropwise to the reactor under the condition of heat preservation and stirring; the monomer is 2-methyl Allyl alcohol polyoxyethylene ether; The initiator material is mixed with 0.175g initiator and 3.5g water; The initiator is potassium persulfate;

[0049] Step 3, mixing 0.263g initiator reducing agent, 1.4g...

Embodiment 3

[0055] The preparation method of the polycarboxylate concrete water reducing agent of the present embodiment comprises the following steps:

[0056] Step 1, 14.9g triethanolamine is warmed up to 80 DEG C, then in the triethanolamine after the temperature rise, maleic acid is added in 5 times, stirred and reacted, after the temperature stabilizes, 0.646mL concentrated sulfuric acid (chemically pure) is added in the reaction mass, Stirring reaction 5h, obtain functional monomer; The total addition amount of described maleic acid is 17.4g;

[0057] Step 2. Put 103g of monomer and 85.8g of water in the reactor, heat up to 45°C and stir for 30 minutes, then add the initiator dropwise into the reactor under the condition of heat preservation and stirring; the monomer is allyl alcohol Polyoxyethylene ether; The initiator material is made by mixing 0.309g initiator and 5.6g water; The initiator is hydrogen peroxide;

[0058] Step 3, mixing 0.37g initiator reducing agent, 2.22g chain ...

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Abstract

The invention discloses a preparation method of a polycarboxylate concrete water reducer. The method comprises the following steps: 1, preparing a functional monomer; 2, placing the monomer and water in a reaction kettle, heating and stirring the monomer and water, and adding an initiator in a dropwise manner; 3, mixing an initiation reducing agent, a chain transfer agent and water to obtain a material A; 4, mixing a mixed monomer and water to obtain a material B; 5, continuously stirring for 5-10min after dropwise addition of the initiator ends, and adding the material A and the material to the reaction kettle in a dropwise manner; and 6, carrying out heat insulation stirring for 1-2h after the dropwise addition ends, adding an alkali solution to adjust the pH value of the material in the reaction kettle to 6-8min, and continuously stirring for 10-30min to obtain the polycarboxylate concrete water reducer. The molecule side chain of the prepared polycarboxylate concrete water reducer contains long-molecular chain macro-monomer and a lot of carboxyl groups, and also contains a sulfonic group, an amino-containing ester group and a siloxane group, and the water reducing rate can reach 36.2-43.6%.

Description

technical field [0001] The invention belongs to the technical field of preparation of concrete admixtures, and in particular relates to a preparation method of a polycarboxylate concrete water reducer. Background technique [0002] With the development of high-performance concrete technology, especially in the future, concrete should not only have high performance, but also must develop towards green and sustainable development in harmony with the environment, which puts forward higher requirements for concrete superplasticizers. Polycarboxylate superplasticizer is the third-generation concrete admixture, especially suitable for preparing high-durability, high-fluidity, high-strength pumping concrete and concrete projects that require high appearance quality. The main functions of polycarboxylate superplasticizer added to concrete are as follows: [0003] 1. Dispersion: After the cement is mixed with water, due to the molecular attraction of the cement particles, the cement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/04C08F228/02C08F222/02C04B24/42C04B103/30
CPCC04B24/42C04B2103/302C08F283/065C08F220/04C08F228/02C08F222/02
Inventor 郭锐
Owner 陕西诚润德高分子材料有限公司