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Polycarboxylic acid series water reducing agent using allyl polyglycol as raw material and synthesizing method thereof

A polyethylene glycol and polycarboxylic acid technology, which is applied in the field of new polycarboxylic acid water reducing agent and its synthesis, can solve the problem of no synthesis process, and achieve the effects of cheap raw materials, improved concrete strength and stable performance.

Inactive Publication Date: 2008-05-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no domestic research results on the synthesis process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1, the new polycarboxylate water reducer using allyl polyethylene glycol (molecular weight 1000) as raw material adopts the following synthesis process: APEG (molecular weight 1000) 31.00% (mass percentage, the same below), maleic anhydride Add 4.10%, 4.90% methyl acrylate, and 60.00% water to the reaction kettle in turn, pass through nitrogen protection, add ammonium persulfate with a total monomer mass of 8%, react at 90°C for 6 hours, and add 50% sodium hydroxide solution , adjust the pH to 7. Adding 1.0% of the water-reducing agent to the weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 be 290mm, and there is no loss in 6 hours.

Embodiment 2

[0015] Example 2, the new polycarboxylate water reducer using allyl polyethylene glycol (molecular weight 2500) as raw material adopts the following synthesis process: APEG (molecular weight 2500) 28.50% (mass percentage, the same below), maleic anhydride Add 5.55%, 5.95% methyl acrylate, and 60.00% water to the reaction kettle in turn, pass through nitrogen protection, add stannous sulfate with 6% of the total mass of the monomer, react at 90°C for 6 hours, and add 50% sodium hydroxide solution , adjust the pH value to 7. Adding 1.2% of the water reducing agent by weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 be 275mm, and there is no loss in 5 hours.

Embodiment 3

[0016] Example 3, the new polycarboxylate water reducer using allyl polyethylene glycol as raw material adopts the following synthesis process: APEG (molecular weight 1500) 33.50% (mass percentage, the same below), maleic anhydride 3.50%, acrylic acid Methyl ester 3.00%, water 60.00%, pass through nitrogen protection, add ammonium persulfate with 5% of total monomer mass, add stannous sulfate with 4% total monomer mass, react at 95°C for 7 hours, add 50% hydrogen Sodium oxide solution, adjust the pH value to 7. Adding 0.8% of the water-reducing agent to the weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 be 270mm, and there is no loss in 5 hours.

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PUM

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Abstract

The invention belongs to the technical field of building materials, in particular to a polycarboxylates water reducing agent taking allyl polyethylene glycol as raw material and a synthetic method thereof. The polycarboxylates water reducing agent is made from raw materials of allyl polyethylene glycol, maleic anhydride, methacrylate, ammonium persulfate, stannous sulfate, sodium hydroxide and water which are compounded in appropriate weight proportion and protected by nitrogen, through heating reaction. Compared with the prior art, the invention is characterized in that two-step synthesis is not necessary, and the cost of raw materials is very low, the product of the process is of stable performance and good market prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a novel polycarboxylate water reducer using allyl polyethylene glycol (APEG) as a raw material and a synthesis method thereof. Background technique [0002] Adding an appropriate amount of water reducing agent to concrete can significantly improve the work performance of fresh concrete and the comprehensive performance of hardened concrete. Polycarboxylate superplasticizer, as a new generation of product, has unique advantages such as low dosage, high water reducing rate, no retardation, low slump loss, and environmental protection. It is suitable for ordinary concrete and special concrete such as high-strength, self-compacting and fair-faced concrete. [0003] At present, the synthesis process of polycarboxylate water reducer in the market is mainly composed of MPEG, methacrylic acid and other monomers, under the action of polymerization inhibitor and cat...

Claims

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Application Information

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IPC IPC(8): C04B24/24C08F216/16C08F220/14C08F222/06C04B103/30
CPCC04B24/267C04B2103/302
Inventor 孙振平黄雄荣
Owner TONGJI UNIV
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