Poly carboxylic acid series water reducing agent with low content and high water-reducing rate, synthetic method and use method thereof

A technology of polycarboxylate and synthesis method, which is applied in the field of polycarboxylate water reducer to achieve the effect of improving concrete strength, high water reducing rate and simple process

Inactive Publication Date: 2011-01-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no domestic researc

Method used

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Examples

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Embodiment 1

[0039] Example 1, a polycarboxylate water reducer with low dosage and high water reducing rate, the weight ratio of its components is: MPEGMA 120 with a molecular weight of 800, TPEG 30 with a molecular weight of 800, AA 15, SMAS 6. APS2, sodium hydroxide 10, water 1000. TPEG and SMAS, MPEGMA and AA were prepared by adding water to a solution with a concentration of 20%, and at the same time, ammonium persulfate was dissolved in 20 times of water, and the following synthesis method was adopted: the mixed solution of TPEG and SMAS monomer was added to the reactor, and nitrogen protection was introduced. , the temperature was raised to 100°C, and the MPEGMA and AA monomer mixed solution and the initiator solution were added dropwise; the monomer mixed solution was added for 1 hour, and the initiator was added for 1.5 hours. Finally, react at a constant temperature of 100°C for 0.5 hours, add sodium hydroxide after cooling, adjust the pH value to 8, and obtain the desired product...

Embodiment 2

[0040]Example 2, a polycarboxylate water reducer with low dosage and high water reducing rate, the weight ratio of each component is: MPEGMA 120 with a molecular mass of 1000, TPEG 50, AA 20, SMAS7 with a molecular mass of 1000 , APS3, sodium hydroxide 4, water 600. TPEG and SMAS, MPEGMA and AA were prepared by adding water to a solution with a concentration of 25%, and at the same time, ammonium persulfate was dissolved in 20 times of water, and the following synthesis method was adopted: the mixed solution of TPEG and SMAS monomer was added to the reactor, and nitrogen gas was introduced Protect, heat up to 80 ° C, start to drop MPEGMA and AA monomer mixed solution and initiator solution respectively; the dropping time of the monomer mixed solution is 3 hours, the initiator dropping time is 3.5 hours, and the initiator solution is added dropwise After completion, react at a constant temperature of 80°C for 1 hour, add sodium hydroxide after cooling, and adjust the pH value t...

Embodiment 3

[0041] Example 3, a polycarboxylate water reducer with low dosage and high water reducing rate, the weight ratio of each component is: MPEGMA 120 with a molecular mass of 1200, APEG 60, AA 30, SMAS with a molecular mass of 1200 12. APS7, sodium hydroxide 8, water 480. TPEG and SMAS, MPEGMA and AA were prepared by adding water to a solution with a concentration of 35%, and at the same time, ammonium persulfate was dissolved in 25 times of water, and the following synthesis method was adopted: the mixed solution of TPEG and SMAS monomer was added to the reactor, and nitrogen gas Protect, heat up to 60 °C, start to drop MPEGMA and AA monomer mixed solution and initiator solution respectively; the dropping time of the monomer mixed solution is 5 hours, and the initiator dropping time is 5.5 hours, and the initiator solution is added dropwise After completion, react at a constant temperature of 60°C for 1.5 hours, add sodium hydroxide after cooling, and adjust the pH value to 7.5 t...

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Abstract

The invention belongs to the technical field of construction materials, and in particular relates to a poly carboxylic acid series water reducing agent with low content and high water-reducing rate, a synthetic method and a use method thereof. The water reducing agent comprises the following components: polyethylene glycol methyl ether methacrylate, 2-methyl allyl alcohol polyethenoxy ether, acroleic acid, methyl sodium allylsulfonate, ammonium persulfate, sodium hydroxide and water. The synthetic method comprises the following concrete steps: respectively preparing TPEG, SMAS, MPEGMA and AA into a mixed solution of which the concentration is 20%-50%, and simultaneously adding an amount of water to APS for dissolving; adding the prepared mixed solution of the TPEG and SMAS monomers to a reaction kettle, introducing nitrogen, inserting a condensing tube, stirring and heating to 60-100 DEG C, and respectively dropwise adding the mixed solution of the MPEGMA and AA monomers and the APS solution, wherein the time for dropwise adding the mixed solution of the monomers is 1-5 hours, and the time for dropwise adding the APS solution is 1.5-5.5 hours; after finishing dropwise adding, isothermally reacting for 0.5-1.5 hours; and cooling and neutralizing with an NaOH solution to obtain the required product. The invention has simple synthesizing process, stable performance of process products, low content, high water-reducing rate and good 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 low dosage and high water-reducing rate, a synthesis method and a use method. Background technique [0002] Compared with naphthalene-based water-reducers, polycarboxylate-based water-reducers have high water-reducing rate, small slump loss, proper air-entrainment, and no use of toxic substances such as formaldehyde in the synthesis process, which is an important factor for realizing high-performance concrete. means. However, the raw materials for synthesizing polycarboxylic acid-based water reducers, such as polyethylene glycol monomethyl ether and (meth)acrylic acid, are relatively expensive, which greatly restricts their popularization and application. [0003] At present, more admixture manufacturers adopt the synthesis method of direct free radical polymerization of polyethylene glycol monomethyl ether (met...

Claims

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Application Information

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IPC IPC(8): C04B24/28C04B103/30
Inventor 孙振平吴小琴罗琼俞洋杨辉刘警
Owner TONGJI UNIV
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