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High-adaptability and high-performance polycarboxylic water-reducing agent and preparation method for same

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of polycarboxylic acid water reducing agent, can solve the problems of general slump-retaining mother liquor and large loss of concrete slump, etc. Good, free-flowing effect

Inactive Publication Date: 2015-09-23
CCCC FOURTH HARBOR ENG INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively improves the slump-preserving performance of the polycarboxylate superplasticizer after compounding. However, due to the general slump-preserving ability of the slump-preserving mother liquor itself, the slump loss of concrete is still relatively large, and the slump loss is as high as 4cm in one hour.

Method used

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  • High-adaptability and high-performance polycarboxylic water-reducing agent and preparation method for same
  • High-adaptability and high-performance polycarboxylic water-reducing agent and preparation method for same
  • High-adaptability and high-performance polycarboxylic water-reducing agent and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]

[0045]

[0046] Add 200 g of monomer a with a concentration of 60% and 15 g of deionized water into a reaction vessel equipped with a stirrer, a reflux condenser, and a drop-adding device, stir and heat, and pass nitrogen to remove oxygen. When the temperature of the reaction vessel rises to 80°C, simultaneously start dropwise adding liquid A consisting of 0.5232g of monomer c, 10.80g of monomer b, and 22.50g of water and liquid B consisting of 1.0464g of ammonium persulfate and 39.00g of water ; control the dropping speed, A solution is dripped in 3 hours, B is dripped in 3.5 hours, after the B solution is added dropwise, keep warm for 2h, then cool down to 40°C, adjust the pH to 6 with 35% concentration NaOH solution, and obtain the concentration of 45% wide adaptability polycarboxylate superplasticizer, recorded as HSPC-1.

Embodiment 2

[0048]

[0049] Add 180 g of monomer a and 142.5 g of deionized water into a reaction vessel equipped with a stirrer, reflux condenser, and drop-adding equipment, stir and heat, and pass nitrogen to remove oxygen. When the temperature of the reaction vessel rises to 80°C, simultaneously start dropwise adding liquid A consisting of 6.2784g of monomer c, 16.20g of monomer b, and 33.0g of water and liquid B consisting of 1.1772g of ammonium persulfate and 64.5g of water ; control the dropping speed, A solution is dripped in 3 hours, B is dripped in 3.5 hours, after the B solution is added dropwise, keep warm for 2h, then cool down to 40°C, adjust the pH to 6 with 35% concentration NaOH solution, and obtain the concentration of 45% wide adaptability polycarboxylate superplasticizer, recorded as HSPC-2.

Embodiment 3

[0051]

[0052]Add 240 g of monomer a with a concentration of 60% and 8 g of deionized water into a reaction vessel equipped with a stirrer, a reflux condenser, and a drop-adding device, stir and heat, and pass nitrogen to remove oxygen. When the temperature of the reaction vessel rises to 60°C, add a solution consisting of 1.12 g of 30% hydrogen peroxide and 8 g of water. After stirring for 5 minutes, start to dropwise add 14.37 g of monomer c, 10.81 g of monomer b, 40.0 g of Liquid A composed of water and liquid B composed of 0.4359g ascorbic acid, 0.71g mercaptopropionic acid, and 52g water; control the dripping speed, the dripping of liquid A is completed in 3 hours, and the dripping of liquid B in 3.5 hours. After the addition of liquid B is completed, keep warm After 2 hours, the temperature was lowered to 40°C, and the pH was adjusted to 6 with a 35% NaOH solution to obtain a wide-adaptability polycarboxylate superplasticizer with a concentration of 45%, which was des...

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Abstract

The invention discloses a high-adaptability and high-performance polycarboxylic water-reducing agent, which is obtained by polymerizing a monomer a (methyl allyl polyethenoxy ether or methyl butyl polyethenoxy ether), a monomer b (acrylic acid) and a monomer c (one or a mixture of more than two of maleic anhydride, methacrylic acid, sodium methallyl sulfonate and the like) in an aqueous solution system under the action of an initiator. The prepared high-performance polycarboxylic water-reducing agent has high adaptability with cement, and also has higher adaptability with concrete aggregate, particularly concrete prepared from manufactured sand; compared with an ordinary polycarboxylic water-reducing agent, the prepared polycarboxylic water-reducing agent has the advantages that the slump flow of concrete is higher under the condition that the slump of the concrete is kept the same, and the concrete can freely flow more favorably.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a wide adaptability polycarboxylate high performance water reducer and a preparation method thereof. Background technique [0002] In recent years, with the construction of large-scale infrastructure projects in my country, especially the implementation of the national high-speed railway and highway network planning, the demand for polycarboxylate high-performance water reducers is increasing. Compared with traditional naphthalene-based superplasticizers, polycarboxylate superplasticizers have the advantages of low dosage, high water reducing rate, good slump retention, and environmental friendliness, and are generally recognized by the concrete engineering community. However, the adaptability between polycarboxylate superplasticizers and cement and mineral admixtures (fly ash, mineral powder, etc.) still exists. At the same time, due to the shortage of reso...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/28
Inventor 李顺王胜年李安
Owner CCCC FOURTH HARBOR ENG INST
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