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Polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent is applied in the field of polycarboxylic acid series water reducing agent and its preparation, which can solve the problems of changing carbon chain length and difficulty, and achieve mild reaction conditions, simple preparation process and water reducing effect. Good results

Active Publication Date: 2014-08-13
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither of the above two water reducer molecules contains long-chain alkyl groups, and it is not easy to achieve the purpose of molecular design by changing the length of the carbon chain.
Using allyl fatty alcohol ether alkoxylate and allyl alcohol alkoxylate as raw materials to carry out copolymerization with methacrylic acid to prepare polycarboxylate water reducer, no report was found after searching

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

[0024] Add 150 grams of deionized water, 150 grams of allyl hexanol polyoxyethylene ether (30EO), 300 grams of allyl alcohol ethoxylate (30EO), and 0.15 grams of sodium persulfate into the four-necked bottle, stirring and heating to At 70°C, start to drop the aqueous solution of methacrylic acid and sodium bisulfite, in which 53 grams of methacrylic acid (n allyl hexanol polyoxyethylene ether: n methacrylic acid = 1:6), sodium bisulfite 0.05 gram, 60 grams of water, dropwise after 2 hours, cooled to 20 ℃ after being incubated at 70 ℃ for 1 hour, added 5wt% sodium hydroxide solution to adjust the pH value to neutrality, and obtained the following structure water reducer:

[0025]

Embodiment 2

[0027] Add 240 grams of deionized water in the four-necked bottle, 80 grams of allyl stearyl polyoxypropylene ether (8EO), 240 grams of allyl alcohol block copolymer (9EO-5PO), 1.6 grams of sodium persulfate, Stir and heat to 30°C, start to drop the aqueous solution of methacrylic acid and sodium metabisulfite, in which 31 grams of methacrylic acid (n allyl stearyl polyoxypropylene ether: n methacrylic acid = 1:3), sodium metabisulfite 0.62 gram, 93 grams of water, after 3 hours, the dropwise addition ends, after being incubated at 30°C for 1 hour, cool to 20°C, add 50% potassium hydroxide solution to adjust the pH value to neutrality, and obtain the following structural water reducer:

[0028]

Embodiment 3

[0030] Add 160 grams of deionized water, 80 grams of allyl lauryl ether ethoxylated propoxylated copolymer (12EO-5PO) and 180 grams of allyl alcohol propoxylate (12EO) into the four-necked bottle , 0.8 grams of potassium persulfate, stirred and heated to 60 ° C, began to drop the aqueous solution of methacrylic acid and sodium bisulfite, in which 20 grams of methacrylic acid (n allyl dodecyl alcohol ether ethoxylated propoxylated Copolymer: n methacrylic acid = 1:5), 0.2 grams of sodium bisulfite, 50 grams of water, dropwise after 2 hours, keep at 60°C for 1 hour, cool to 20°C, add 15% carbonic acid The sodium solution adjusts the pH value to neutrality to obtain the following structural water reducer:

[0031]

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Abstract

The invention discloses a polycarboxylic acid water reducing agent, the formula of which is as shown in the specification; R1 in the formula is a straight chain with 6 to 18 carbon atoms, and a branched alkyl; a is not less than 0 and not more than 30; b is not less than 0 and not more than 30; x is not less than 0 and not more than 30; y is not less than 0 and not more than 30, wherein a and b cannot be zero at the same time; x and y cannot be zero at the same time. The invention has the advantages of simple preparation process, mild reaction condition, controllable technological process, stable product performance and good water reducing effect.

Description

technical field [0001] The invention belongs to a water reducer and its preparation method, in particular to a polycarboxylate water reducer and its preparation method. technical background [0002] After the concrete is mixed with the water reducing agent, the water reducing agent can fully disperse the cement particles, thereby improving the fluidity of the concrete and enhancing its workability; while maintaining the original workability, it can reduce water consumption. amount to increase the strength of concrete. Due to the application of water-reducing agent, its water-reducing effect can greatly reduce the water-cement ratio of concrete, thereby improving the strength of concrete. In this way, concrete with higher strength grade can be prepared. consumption, thereby reducing costs and improving economic benefits. [0003] In recent years, with the increase of construction in our country and the rapid development of high-speed rail, polycarboxylate superplasticizer h...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F216/14C04B24/26C04B103/30
Inventor 孙永强杨卉艳郭建国史修启智丽飞孙晋源张勇武华萍
Owner CHINA RES INST OF DAILY CHEM IND
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