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Ethers polycarboxylic acid water reducing agent and preparation

A kind of ether polycarboxylate and preparation technology, applied in the field of ether polycarboxylate water reducer and its preparation technology, can solve the problems of difficult control of polymer molecular weight, increase of industrial production cost, low water reducing rate of concrete, etc. Achieve the effect of improving the performance of slump retention, easy control of reaction conditions, and good workability

Inactive Publication Date: 2009-07-29
杭州传化建筑新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this method is to use a large amount of organic solvents, which pollutes the environment greatly, and is harmful to the human body, and it is difficult to remove the solvent, which increases the industrial production cost; 3, by allyl polyethylene glycol and unsaturated carboxylic acid monomer in Polycarboxylate superplasticizers are prepared by free radical copolymerization in aqueous solution. This method has defects such as difficult control of polymer molecular weight, wide molecular weight distribution, low water-reducing rate of mixed concrete, and large slump loss.

Method used

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  • Ethers polycarboxylic acid water reducing agent and preparation
  • Ethers polycarboxylic acid water reducing agent and preparation
  • Ethers polycarboxylic acid water reducing agent and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The composition and ratio of the monomers used are as follows:

[0035] 1) Monomer A: allyl polyoxyethylene glycol ether (APEG), with a molecular weight of 2000, accounting for 10% of the total monomer weight;

[0036] 2) Monomer B: acrylic acid (AA), accounting for 70% of the total monomer weight;

[0037] 3) Monomer C: hydroxyethyl acrylate, accounting for 20% of the total weight of monomers.

[0038] Two, the preparation process is as follows:

[0039] 1) Add 10g of allyl polyoxyethylene glycol ether monomer into the reactor, and add 10g of deionized water to dissolve it;

[0040] 2) Purge the reactor with nitrogen gas while stirring and raising the temperature. When the temperature rises to 60°C, add dropwise a mixed aqueous solution made of 70g of acrylic acid monomer, 20g of hydroxyethyl acrylate monomer and 95g of deionized water and 50g of 10% persulfuric acid Ammonium aqueous solution, ensure that the dropwise addition is completed within 4 hours;

[004...

Embodiment 2

[0043] 1. The composition and ratio of the monomers used are as follows:

[0044] 1) Monomer A: allyl polyoxyethylene glycol ether (APEG), with a molecular weight of 2400, accounting for 40% of the total monomer weight;

[0045] 2) Monomer B: acrylic acid (AA), accounting for 30% of the total monomer weight;

[0046] 3) Monomer C: hydroxyethyl acrylate, accounting for 30% of the total weight of monomers.

[0047] Two, the preparation process is as follows:

[0048] 1) Add 40g of allyl polyoxyethylene glycol ether monomer into the reactor, and add 24g of deionized water to dissolve it;

[0049] 2) Purge the reactor with nitrogen gas while stirring and heating up. When the temperature rises to 90°C, add dropwise a mixed aqueous solution made of 30g acrylic acid monomer, 30g hydroxyethyl acrylate monomer and 99g deionized water and 30g10% persulfuric acid Ammonium aqueous solution, ensure that the dropwise addition is completed within 4 hours;

[0050] 3) After dropping, keep...

Embodiment 3

[0052] 1. The composition and ratio of the monomers used are as follows:

[0053] 1) Monomer A: allyl polyoxyethylene glycol ether (APEG), with a molecular weight of 3000, accounting for 70% of the total monomer weight;

[0054] 2) Monomer B: acrylic acid (AA), accounting for 20% of the total monomer weight;

[0055] 3) Monomer C: hydroxyethyl acrylate, accounting for 10% of the total weight of monomers.

[0056] Two, the preparation process is as follows:

[0057] 1) Add 70g of allyl polyoxyethylene alcohol ether monomer into the reactor, and add 25g of deionized water to dissolve it;

[0058] 2) Purging the reactor with nitrogen while stirring and raising the temperature, when the temperature rises to 120°C, add dropwise the mixed aqueous solution made of 20g acrylic acid monomer, 10g hydroxyethyl acrylate monomer and 80g deionized water and 50g 10% superhydrogen Aqueous ammonium sulfate solution, ensure that the dropwise addition is completed within 4 hours;

[0059]3) ...

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Abstract

The invention discloses an ether polycarboxylic water reducing agent which is obtained through water solution copolymerization of three types of monomers of 10-70 percent of allyl polyxyethylated alcohol ether, 20-70 percent of acrylic acid and 10-30 percent of hydroxy-ethyl acrylate. Due to the introduction of hydroxy-ethyl acrylate, the ether polycarboxylic water reducing agent reduces the self-polymerization proportion of the acrylic acid, improves the copolymerization proportion, and greatly reduces the cost of the raw materials; in addition, the molecular weight of the polymer is controllable, the water reduction rate is high, the loss of slump constant with the time is low, and the prepared concrete has high fluidity, good workability, and enough early strength in the beginning of hardening. Besides, the preparation technique of the ether polycarboxylic water reducing agent is a one-step method, the operation is simple, the reaction conditions are easy to control, the production period is short, and the ether polycarboxylic water reducing agent is green and environment-friendly, has low cost and is applicable to industrial production on large scale.

Description

technical field [0001] The invention relates to an ether polycarboxylate water reducer and a preparation process thereof, belonging to the technical field of concrete admixtures. Background technique [0002] Concrete high-efficiency water reducer, also known as superplasticizer, mainly plays three different roles in concrete production: ① Improve the workability of concrete construction and facilitate mechanized operations without changing the concrete components; ② Under given conditions , reduce the mixing water and water-cement ratio to increase the strength of concrete and improve durability; ③Under a given workability, reduce the amount of water and cement, save cement, and reduce creep, shrinkage and cement hydration heat Thermal Stress. [0003] Although traditional polycondensation-type superplasticizers such as naphthalene and melamine have good workability for fresh concrete, their dosage is high, and the slump loss over time is too large. Generally, multiple add...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/28C04B24/24C04B103/30
Inventor 张鑫樊钧周南南叶光锐王海宾
Owner 杭州传化建筑新材料有限公司
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