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Low air content polycarboxylic acid water reducer and preparation method thereof

A polymer and total mass technology, applied in the field of polymer and its preparation, can solve the problems of unfavorable large-scale production, low gas content of products, narrow adaptability of cement, etc., achieve high strength, simple production process, and strong selectivity Effect

Active Publication Date: 2015-06-24
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the methods and products disclosed in these documents have complicated production processes and are not conducive to large-scale production; or the products have low gas content, but poor slump retention and narrow cement adaptability; or use organic solvents, which are not only environmentally unfriendly, and high production cost

Method used

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  • Low air content polycarboxylic acid water reducer and preparation method thereof
  • Low air content polycarboxylic acid water reducer and preparation method thereof
  • Low air content polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0070] In the reactor, add 94 grams of water and 4.3 grams of monomer A (perfluoroalkyl phosphate monoacrylate with molecular weight of 1700), 78 grams of monomer B (alkylene polyoxyethylene, poly Oxygen propylene ether), 35.5 grams of monomer C (maleic anhydride), stirred and heated to 80 ° C, and then added dropwise the initiator (0.71 grams of ammonium persulfate and 40 grams of water mixture), the dropping time was 3 hours, aging The time is 4 hours, after the reaction is finished, the temperature is lowered to normal temperature, the pH value is adjusted to neutrality with a NaOH aqueous solution with a mass concentration of 30%, and the material is discharged to obtain a high-performance polycarboxylate water reducer product. The weight average molecular weight of the polymer was 25830.

[0071] Monomer A is

[0072]

example 2

[0074] In the reactor, add 105 grams of water and 12 grams of monomer A (perfluoroalkyl phosphate monoacrylate with molecular weight of 6000), 70 grams of monomer B (methylalkenylpolyoxyethylene, polyoxyethylene with molecular weight of 2000). Oxygen propylene ether), 54 grams of monomer C (maleic anhydride), stirred and heated to 80 ° C, then added dropwise the initiator (2.85 grams of ammonium persulfate and 40 grams of water mixture), the dropping time was 3.5 hours, aging The time is 4 hours, after the reaction is finished, the temperature is lowered to normal temperature, the pH value is adjusted to neutrality with a NaOH aqueous solution with a mass concentration of 30%, and the material is discharged to obtain a high-performance polycarboxylate water reducer product. The weight average molecular weight of the polymer was 27,900.

[0075] Monomer A is

[0076]

example 3

[0078] In the reactor, add 82.5 grams of water and 18 grams of monomer A (perfluoroalkyl phosphate acrylate with a molecular weight of 1000), 27.5 grams of monomer B (an alkylene-based polyoxyethylene, polyoxyethylene with a molecular weight of 1500 propylene ether), 40.8 grams of monomer C (acrylic acid), stirring and heating to 70 ° C, then dropwise adding initiator (2.24 grams of ammonium persulfate and 20 grams of water mixture), the dropping time is 2.5 hours, the aging time is 3.5 hours, After the reaction is finished, cool down to normal temperature, adjust the pH value to neutral with a NaOH aqueous solution with a mass concentration of 30%, and discharge the material to obtain a high-performance polycarboxylate water-reducer product. The solid content of the obtained product is 43%, and the weight-average molecular weight of the obtained polymer is for 21500.

[0079] Monomer A is

[0080]

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Abstract

The invention relates to a low air content concrete polycarboxylic acid water reducer and a preparation method thereof. The water reducer is a polymer formed by random copolymerization of A, B and C monomers and has an average molecular weight of 10000-30000, wherein structures of the monomer A, B and C are respectively shown as the following formula (I), (II) and (III), and the meaning of each symbol involved in the formulas can be seen in the specification. The preparation method provided in the invention takes polyoxyethylene and polyoxypropylene ether with a molecular weight of 900-4000 as polymerization monomers to perform random free radical copolymerization in an aqueous solution system. Due to the introduction of perfluoroalkyl phosphate acrylate to a side chain, the air-entraining defoaming function of the water reducer can be improved, and at the same time, the distribution density of main and side chains tends to be more reasonable, so that the water-reducing rate, cement adaptability and slump retention of the water reducer can be improved. In addition, the preparation method involved in the invention has a simple process and less pollution, and can significantly improve the production efficiency and production benefits.

Description

technical field [0001] The present invention relates to a polymer and a preparation method thereof, more specifically, the present invention relates to a polycarboxylate water reducer for low air content concrete and a preparation method thereof. Background technique [0002] With the development of concrete in my country in recent years, the performance of concrete in all aspects has been continuously improved, and the requirements for concrete water reducing agents are also getting higher and higher. Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, which has the advantages of low dosage, high water reducing rate, small slump loss, strong adaptability to cement, and can greatly improve the mixing capacity of fly ash and mineral powder. The amount of material used can greatly save cement, and it is equipped with high-strength and ultra-high-strength concrete. It is widely used in high-strength, high-durability, and high-cement ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F230/02C08F222/06C08F220/06C08F222/02C04B24/26C04B103/30
Inventor 朱建民刘兆斌董振鹏仲崇刚周立明刘晓杰范雷
Owner LIAONING OXIRANCHEM INC
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