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Polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent, used in the field of concrete polycarboxylic acid series water reducing agent, can solve the problems of unsatisfactory product performance, difficult process control, low water reduction rate, etc., and achieves safety and environmental friendliness. , moderate activity, improve the effect of adsorption effect

Active Publication Date: 2012-10-10
LIAONING OXIRANCHEM INC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its water reduction rate is not high, so its application is limited
[0006] To sum up, in the past inventions, there are not only various problems such as difficult control of the process, but also unsatisfactory product performance. The present invention proposes a new polycarboxylic acid system based on consideration of the problems in the past inventions. The water reducing agent and its preparation method can improve and enhance the product performance, especially in the aspect of concrete slump retention performance, which has obvious effect

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

[0051] Put 240 grams of AL (weight average molecular weight 2400) and 147 grams of water into the reaction kettle, turn on the agitator, slowly heat up to 50°C, add 12.60 grams of hydrogen peroxide solution with a mass concentration of 30%, and wait until the temperature rises to 50°C to stabilize Afterwards, add dropwise the 2# aqueous solution 48.2g that contains 2.0680 gram Vc and 3.7366 gram MPA; After treating that 2# solution is added dropwise 2min, begin to drip the 1# aqueous solution 39.2 grams that contain 19.6 gram MA and 0.92 gram c1, the time for adding is 3 hours. After adding 1# and 2# aqueous solution, keep it at 50°C for 1 hour. Then lower the temperature to below 30°C, and then use 30% sodium hydroxide solution to neutralize to a pH value of 7 to obtain a polycarboxylate water reducer product of the present invention, whose structural formula is shown in formula (5): Weight average molecular weight: 15000~30000.

[0052]

[0053] Wherein, x:y=1:1.5-2.5, ...

Embodiment 2

[0055] Add 240 grams of MAL (weight average molecular weight 2400) and 147 grams of water into the reaction kettle, turn on the stirrer, slowly heat up to 60°C, add 10.95 grams of hydrogen peroxide solution with a mass concentration of 30%, and wait until the temperature rises to 60°C to stabilize Afterwards, 48.2 g of 2# aqueous solution containing 1.7972 g of Vc and 3.2473 g of MPA was added dropwise; the dropping time was 3.5 hours. After 2# was added dropwise for 2 minutes, 39.2 grams of 1# aqueous solution containing 19.6 grams of AA and 4.15 grams of C2 was added dropwise, and the dropping time was 3 hours. After adding 1# and 2# aqueous solution, keep it at 60°C for 1 hour. Then lower the temperature to below 30°C, and then neutralize with 30% sodium hydroxide solution until the pH value is 7, and then obtain a polycarboxylate water reducer product of the present invention, its structure is shown in formula (6): Weight average molecular weight: 20000~35000.

[0056] ...

Embodiment 3

[0059] Add 240 grams of MAL (weight average molecular weight 2400) and 147 grams of water into the reaction kettle, turn on the stirrer, slowly heat up to 60°C, add 10.95 grams of hydrogen peroxide solution with a mass concentration of 30%, and wait until the temperature rises to 60°C to stabilize Afterwards, 48.2 g of 2# aqueous solution containing 1.7972 g of Vc and 3.2473 g of MPA was added dropwise; the dropping time was 3.5 hours. After 2# was added dropwise for 2 minutes, 39.2 grams of 1# aqueous solution containing 19.6 grams of AA and 2.82 grams of C3 was added dropwise, and the dropping time was 3 hours. After the 1# and 2# aqueous solutions are added, keep at 60°C for 1 hour, then cool down to below 30°C, and then neutralize with 30% sodium hydroxide solution to a pH value of 7 to obtain a polycarboxylic acid reducing agent of the present invention. The liquid product has a structure as shown in formula (7): the corresponding weight-average molecular weight: 20,000-3...

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Abstract

The invention provides a concrete polycarboxylic acid water reducing agent, structure of which is shown in the following formula (1), wherein R1, R2, R4 and R6 are H or alkyl groups with 1 to 3 carbon atom(s); R3 is an alkylidene group with 1 to 20 carbon atom(s); R5 is H or -COOM and M is H, Na or K; R is an alkylidene group or arylidene with 1 to 10 carbon atom(s); Y represents COOH or -SO3H; BO is -C2H4O<->, -C3H6O<-> or -C4H8O<->, or an ordered block or an disorder hybrid block formed among -C2H4O<->, -C3H6O<-> or -C4H8O<->; m is a positive integer from 10 to 120; and n, x, y and z are all positive numbers. The water reducing agent can endow good working performance to concrete, increase the early-period dispersion performance and later-period slump maintaining performance of concreteand improve the adaptability of polycarboxylic acid water reducing agent. The invention also provides a preparation method for the water reducing agent.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a concrete polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the increasing scale of China's construction, high-speed railways, highways, major infrastructure, super high-rise buildings and nuclear power plants, etc., the requirements for the construction performance and comprehensive performance of concrete are also getting higher and higher. Adding admixtures to concrete is an effective means to improve the construction performance and comprehensive performance of concrete. As the most important type of concrete admixture, water reducing agent can greatly reduce the mixing water consumption at extremely low dosage and improve the performance of concrete. At present, both at home and abroad are shifting from the first-generation and second-generation water-reducing agents to polycarboxylate-based water-reducers, because polycarboxylate-bas...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/16C08F290/06C08F222/38C04B103/30
Inventor 朱建民刘兆滨董振鹏仲崇纲周立明侯光田威
Owner LIAONING OXIRANCHEM INC
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