Polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water-reducing agent, applied in the field of concrete water-reducing agent, can solve the problems of complicated addition and metering of admixtures, difficult operation control, deterioration of concrete workability, etc., so as to shorten synthesis time, prevent erosion, and protect from The effect of erosion

Inactive Publication Date: 2010-07-07
天津市飞龙砼外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The common method of preparing seawater erosion-resistant concrete in China is to add rust inhibitor, micro-expansion agent, air-entraining agent, water-reducing agent, waterproofing agent, etc. when preparing concrete. D

Method used

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  • Polycarboxylic acid water reducing agent and preparation method thereof
  • Polycarboxylic acid water reducing agent and preparation method thereof
  • Polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of polycarboxylate superplasticizer, the weight percent of its each component is made up of:

[0042] Polycarboxylate 40

[0043] Rust inhibitor sodium nitrite 22

[0044] Air-entraining agent sodium dodecylbenzene sulfonate 1.7

[0045] Water repellant sodium stearate 10

[0046] Defoamer polyether polyol 0.3

[0047] Volume stabilizer aluminum sulfate 26

Embodiment 2

[0049] The preparation method of polycarboxylate superplasticizer: add 180g of polycarboxylate superplasticizer with a solid content of 40% into the reaction vessel equipped with stirring, condensation and filtration devices, heat and stir at 80°C, add rust inhibitor Sodium nitrate 50g, air-entraining agent sodium dodecylbenzene sulfonate 3.2g, waterproofing agent sodium stearate 30g, add water 120g, react for 50 minutes, add defoamer polyether polyol 1.5g, volume stabilizer aluminum sulfate 70g, carry out synthesis reaction. After constant temperature reaction for 1 hour, use a filter to filter the insoluble matter to obtain the finished product 1 with a concentration of 48.9%.

Embodiment 3

[0051] The preparation method of polycarboxylate superplasticizer: add 150g of polycarboxylate superplasticizer with a solid content of 40% into the reaction vessel equipped with stirring, condensation and filtration devices, heat and stir at 60°C, add rust inhibitor Sodium nitrate 70g, air-entraining agent sodium dodecylbenzenesulfonate 2.2g, waterproofing agent sodium stearate 25g, add water 150g, react for 30 minutes, add defoamer polyether polyol 1.2g, volume stabilizer aluminum sulfate 80g, carry out synthesis reaction. After constant temperature reaction for 2 hours, use a filter to filter the insoluble matter to obtain the finished product 2 with a concentration of 47.8%.

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Abstract

The invention relates to a polycarboxylic acid water reducing agent and a preparation method thereof, belonging to the technical field of concrete water reducing agent. The polycarboxylic acid water reducing agent comprises the following components in percentage by weight: 30-50 of polycarboxylic acid, 15-30 of sodium nitrite as a corrosion resisting agent, 0.1-2.0 of sodium dodecyl benzene sulfonate as an air-entraining agent, 5-15 of sodium stearate as a waterproofing agent, 0.1-0.5 of polyether glycol as a defoaming agent and 15-40 of aluminum sulfate as a volume stabilizer. The preparation method comprises the following steps: adding the polycarboxylic acid into a reaction kettle, controlling the temperature at 45-80 DEG C, and while stirring, adding the sodium nitrite as the corrosion resisting agent, the sodium dodecyl benzene sulfonate as the air-entraining agent, the sodium stearate as the waterproofing agent, the polyether glycol as the defoaming agent and the aluminum sulfate as the volume stabilizer to carry out a synthetic reaction, and isothermally reacting for 1.5-2.5 hours to obtain the polycarboxylic acid water reducing agent. The water reducing agent of the invention has high water reducing rate, high concrete durability, good compatibility, good adaptivity and long service life, and the process of the invention has the advantages of simple flow, short reaction time, convenient industrial production, safety, cleanness and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, with the vigorous development of marine resources exploration and mining, the volume of seaborne cargo continues to grow, and various marine engineering projects such as offshore oil drilling platforms, ports, wharfs, cross-sea tunnels and bridges are rapidly increasing. The demand for water agents is increasing year by year, and the marine construction industry is in urgent need of multifunctional polycarboxylate water reducer products. [0003] The common method of preparing seawater erosion-resistant concrete in China is to add rust inhibitor, micro-expansion agent, air-entraining agent, water-reducing agent, waterproofing agent, etc. when preparing concrete. Due to the compatibility problems of different types of admixtures, it may cause the concrete De...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/30
Inventor 石春李和生
Owner 天津市飞龙砼外加剂有限公司
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