Polycarboxylic acid water reducer with strong cement adaptability, synthesis method and using method

A polycarboxylate-based water-reducing agent technology, applied in the field of polycarboxylate-based water-reducing agents, to achieve high water-reducing rate, increase concrete strength, and good adaptability

Inactive Publication Date: 2011-01-12
李党义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1, the polycarboxylate water reducer with polyethylene glycol monomethyl ether methacrylate and allyl polyethylene glycol as the main raw materials, its weight ratio is: MPEGMA 100 with a molecular mass of 800, molecular weight APEG 30 with a mass of 1200, MAA 15, AMPS 0.5, mercaptan chain transfer agent 1, ammonium persulfate 1.5, sodium hydroxide 3, water 225. APEG, monomer mixture and ammonium persulfate were respectively prepared into solutions with a concentration of 40%, and the following synthesis method was adopted: APEG solution was added to the reactor, nitrogen protection was introduced, the temperature was raised to 60°C, and the monomer mixed solution and initiator were started to be added dropwise solution; the dropping time of the monomer mixed solution is 1 hour, and the dropping time of the initiator is 1.5 hours. After the dropping of the initiator solution is completed, react at a constant temperature of 60°C for 0.5 hours, add sodium hydroxide...

Embodiment 2

[0043]Example 2, the polycarboxylate water reducer with polyethylene glycol monomethyl ether methacrylate and allyl polyethylene glycol as the main raw materials, its weight ratio is: MPEGMA 100 with a molecular weight of 2000, molecular weight APEG 50 with a quality of 800, MAA 35, AMPS 1, mercaptan chain transfer agent 4, ammonium persulfate 5, sodium hydroxide 5, water 200. APEG, monomer mixture and ammonium persulfate were respectively prepared into solutions with a concentration of 50%, and the following synthesis method was adopted: APEG solution was added to the reactor, nitrogen protection was introduced, the temperature was raised to 80°C, and the monomer mixed solution and initiator were started to be added dropwise solution; the dropping time of the monomer mixed solution is 3 hours, and the dropping time of the initiator is 3.5 hours. After the initiator solution is added dropwise, react at a constant temperature of 80°C for 1 hour, add sodium hydroxide, and adjust ...

Embodiment 3

[0044] Example 3, the polycarboxylate water reducer with polyethylene glycol monomethyl ether methacrylate and allyl polyethylene glycol as the main raw materials, its weight ratio is: MPEGMA 100 with a molecular mass of 1600, molecular weight APEG 60 with a quality of 2000, MAA 30, AMPS 1.25, mercaptan chain transfer agent 3, ammonium persulfate 7, sodium hydroxide 6, water 600. APEG, monomer mixture and ammonium persulfate were respectively prepared into solutions with a concentration of 25%, and the following synthesis method was adopted: APEG solution was added to the reactor, nitrogen protection was introduced, the temperature was raised to 60°C, and the monomer mixed solution and initiator were started to be added dropwise solution; the dropping time of the monomer mixed solution is 4 hours, and the dropping time of the initiator is 4.5 hours. After the dropping of the initiator solution is completed, react at a constant temperature of 90°C for 1 hour, add sodium hydroxid...

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Abstract

The invention belongs to the technical field of a building material, particularly relating to a polycarboxylic acid water reducer with strong cement adaptability, a synthesis method and a using method. The water reducer is composed of PEGMEMA, allyl polyethylene glycol (APEG), methacrylic acid (MAA), 2-acrylamide-2-methacrylonitrile sulfoacid (AMPS), mercaptans chain transfer agent, ammonium persulphate, sodium hydroxide and water. The specific steps are as follows: the APEG and the ammonium persulphate are respectively prepared into solutions the concentrations of which are 20-50%; meanwhile, the MPEGMA, the MAA, the AMPS and the mercaptans chain transfer agent are mixed and prepared into a monomer mixed solution; the prepared APEG solution is added into a kettle; nitrogen is introduced in; a condensation pipe is inserted; temperature rises to 60-100 DEG C; the monomer mixed solution and the ammonium persulphate solution are dropwise added, wherein the dropwise addition time of the monomer mixed solution is 1-5 hours, the dropwise addition time of the ammonium persulphate solution is 1.5-5.5 hours; after the monomer mixed solution and the ammonium persulphate solution are dropwise added, the mixture reacts for 0.5-1.5 hours at constant temperature; and the obtained mixture is cooled and evenly mixed to obtain the required product. The invention has the advantages of simple synthesis technology, stable performance of craft products, low dosage, good adaptability to cement and favourable market prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polycarboxylate water-reducer with strong adaptability to cement, a synthesis method and a use method thereof. Background technique [0002] Polycarboxylate water-reducing agent has high water-reducing rate, small slump loss, proper air-entrainment, can improve the durability and service life of concrete, and is an important means of high-performance concrete. my country has a wide variety of cements with complex components and large performance changes. Although polycarboxylate superplasticizers have many excellent properties, they also have problems with the adaptability of cement, which greatly limits their popularization and application. [0003] The adaptability of the admixture means that under the same conditions, the use effect of the admixture is quite different, or even completely different, due to different cements. Polycarboxylate superplasti...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F290/06C04B103/30
Inventor 孙振平罗琼吴小琴
Owner 李党义
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