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Method for preparing polycarboxylic acid high-efficiency slushing agent

A high-efficiency water reducing agent and polycarboxylic acid technology, which is applied in the field of chemical building materials, can solve the problems of slump loss, low water reducing rate, large water reducing rate, etc., and achieve high water reducing rate and concrete workability Good, good usability effect

Inactive Publication Date: 2013-04-03
陈银凤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polycarboxylate high-efficiency superplasticizer is easy to use, safe and efficient. The precautions for use are as follows: 1. The dosage of polycarboxylate superplasticizer is 0.5%-2% of the total weight of the cementitious material, and the usual dosage is 0.8% -1.5%; 2. Polycarboxylate high-efficiency superplasticizers cannot be mixed with naphthalene-based high-efficiency water-reducers; 3. When using polycarboxylate high-efficiency water-reducers, they can be directly mixed in the form of stock solution or formulated to a certain concentration 4. Due to the large water-reducing rate of concrete mixed with polycarboxylic acid superplasticizer, the water consumption must be strictly controlled during use; adaptability, but for some cements, the water-reducing rate may be low and the slump loss may be too large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Use 6 stirring containers to respectively account for 6% of the total amount of acrylic acid, 5% of sodium methacrylate, 3% of maleic anhydride, 3% of allyl polyoxyethylene ether sulfate, 2% of potassium persulfate , 1% sodium hydroxide to prepare a 20% aqueous solution; send the 20% aqueous solution of acrylic acid, sodium methacrylate, maleic anhydride, and allyl polyoxyethylene ether sulfate into the chemical reaction kettle at the same time, start stirring, and Slowly raise the temperature to about 85°C while stirring, drop 20% potassium persulfate aqueous solution into the chemical reaction kettle, and keep it warm for 2.5 hours after the drop is completed; continue stirring, cool down to room temperature, and use 20% sodium hydroxide aqueous solution Adjust the pH value to about 8, stop stirring and discharge to obtain the finished product.

Embodiment 2

[0013] Use 6 stirring containers to respectively account for 6.5% of the total amount of acrylic acid, 4.5% of sodium methacrylate, 3% of maleic anhydride, 3% of allyl polyoxyethylene ether sulfate, 2% of potassium persulfate , 1% sodium hydroxide to prepare a 20% aqueous solution; send the 20% aqueous solution of acrylic acid, sodium methacrylate, maleic anhydride, and allyl polyoxyethylene ether sulfate into the chemical reaction kettle at the same time, start stirring, and Slowly raise the temperature to about 85°C while stirring, drop 20% potassium persulfate aqueous solution into the chemical reaction kettle, and keep it warm for 2.5 hours after the drop is completed; continue stirring, cool down to room temperature, and use 20% sodium hydroxide aqueous solution Adjust the pH value to about 8, stop stirring and discharge to obtain the finished product.

Embodiment 3

[0015] Use 6 stirring containers to respectively account for 7% of the total amount of acrylic acid, 4% of sodium methacrylate, 3% of maleic anhydride, 3% of allyl polyoxyethylene ether sulfate, 2% of potassium persulfate , 1% sodium hydroxide to prepare a 20% aqueous solution; send the 20% aqueous solution of acrylic acid, sodium methacrylate, maleic anhydride, and allyl polyoxyethylene ether sulfate into the chemical reaction kettle at the same time, start stirring, and Slowly raise the temperature to about 85°C while stirring, drop 20% potassium persulfate aqueous solution into the chemical reaction kettle, and keep it warm for 2.5 hours after the drop is completed; continue stirring, cool down to room temperature, and use 20% sodium hydroxide aqueous solution Adjust the pH value to about 8, stop stirring and discharge to obtain the finished product.

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Abstract

The invention discloses a method for preparing a polycarboxylic acid high-efficiency slushing agent which belongs to the field of chemical building materials. The polycarboxylic acid high-efficiency slushing agent is prepared from the materials of acrylic acid, sodium methacrylate, maleic anhydride, polyoxypropylene ether sulfate, potassium peroxodisulfate, sodium hydroxide and deionized water in the assistance of a certain process conditions. The preparation method has the advantages that the production process is simple, and the product is non-toxic and suitable for various cements; and the preparation method has the characteristics that the raw material separation can be protected, so that concrete with consistent quality is manufactured; 2, high availability in a long time is kept; 3, slurry is reduced, and the deep precipitation of concrete is reduced; and 4, the polycarboxylic acid high-efficiency slushing agent has good slushing effect, collapse resistance, high water-reducing rate and high concrete workability.

Description

technical field [0001] The product of the invention belongs to the field of chemical building materials, and in particular relates to a preparation method of a polycarboxylic acid high-efficiency water reducer. Background technique [0002] Polycarboxylate high-efficiency superplasticizer is a new third-generation high-performance superplasticizer. Its appearance is light brown liquid, density is 1.07, solid content is 22%, pH value is 6-8, and water reducing rate is 25%-45%. The bleeding rate ratio is ≤20%, and the steel bar is not corroded when used, and the commonly used dosage is 0.8-1.5%. Polycarboxylate high-efficiency water-reducing agent has high technological content, good application prospects, excellent comprehensive performance, and good adaptability to cement. Its advantages are: 1. Low dosage, high water-reducing rate, and the water-reducing rate can reach up to 45%. It can be used to prepare high-strength and high-performance concrete; 2. When the slump is li...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/06C08F222/06C04B24/16C04B103/30
Inventor 不公告发明人
Owner 陈银凤
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