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Polycarboxylate superplasticizer with high dispersion and high slump protection and preparation method of polycarboxylate superplasticizer

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylate water reducing agent and its preparation, can solve the problems of reducing the adsorption of water reducing agent molecules and cement particles, affecting the conveying performance of concrete, and the same product performance, and improving the performance of the product. Workability, contact reduction, water consumption reduction effect

Active Publication Date: 2014-07-02
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of cement manufacturers in our country, the product performance cannot help but be the same, and sand and gravel will also affect the transmission performance of concrete
At the same time, because in the existing polymerization reaction, the polymerized monomers are mainly small monomers such as acrylic acid and acrylamide, these small monomers have small steric hindrance and are easy to polymerize, but the small steric hindrance will also reduce the water reducer molecules and cement. Adsorption between particles, and in practical applications, the loss is fast and the retention ability is not good

Method used

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  • Polycarboxylate superplasticizer with high dispersion and high slump protection and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer with high dispersion and high slump protection and preparation method of polycarboxylate superplasticizer
  • Polycarboxylate superplasticizer with high dispersion and high slump protection and preparation method of polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add allyl alcohol polyoxyethylene ether (MW=1100, 66.5g, see formula 1.1) into a 500mL four-necked flask equipped with mechanical stirring, temperature controller, and dripping device, and add deionized water (33.5g) at the same time, Heat up while stirring and dissolving; prepare the solution of monomer B and monomer C, that is, the solution of acrylic acid (12.97g, see formula 1.2) and 1-phenylacrylic acid (3.58g, see formula 1.3); prepare reducing agent and The solution of chain transfer agent, is about to ascorbic acid (0.12g), mercaptoacetic acid (0.27g) are dissolved in deionized water (52g); Preparation oxidizing agent solution, mass concentration is that 30% hydrogen peroxide (0.37g) is dissolved in deionized water (7.5g); when the temperature in the reaction bottle is 60~65°C, first add the oxidizing agent solution, after stirring for 5 minutes, then dropwise add the solution of monomer B and monomer C and the solution of reducing agent and chain transfer agent ...

Embodiment 2

[0057] Add methallyl alcohol polyoxyethylene ether (MW=2300, 139.05g, see formula 2.1) into a 500mL four-neck flask equipped with mechanical stirring, temperature controller, and dripping device, and add deionized water (71.63g ), heating up while stirring and dissolving; prepare a solution of monomer B and monomer C, that is, a solution of acrylic acid (13.08g, see formula 2.2) and 1-p-hydroxyphenylacrylic acid (3.57g, see formula 2.3); Prepare the solution of reducing agent and chain transfer agent, be about to dissolve ascorbic acid (0.09g), mercaptoacetic acid (0.18g) in deionized water (52g); prepare oxidizing agent solution, be that the mass concentration is 30% hydrogen peroxide (0.09g) dissolving In deionized water (7.5g); when the temperature in the reaction bottle is 60~65°C, first add the oxidizing agent solution, stir for 5 minutes, then dropwise add the solutions of monomer B and monomer C, reducing agent and chain transfer The solution of the agent was added drop...

Embodiment 3

[0061] Add allyl alcohol polyoxyethylene ether (MW=1100, 66.5g, see formula 3.1) into a 500mL four-neck flask equipped with mechanical stirring, temperature controller, and dripping device, and add deionized water (33.5g) at the same time, Heat up while stirring and dissolving; prepare the solution of monomer B and monomer C, that is, the solution of acrylic acid (17.4g, see formula 3.2) and 1-phenylacrylic acid (4.64g, see formula 3.3); prepare reducing agent and The solution of chain transfer agent, is about to ascorbic acid (0.08g), thioglycolic acid (0.21g) are dissolved in deionized water (52g); Preparation oxidizing agent solution, mass concentration is that 30% hydrogen peroxide (0.22g) is dissolved in deionized water (7.5g); when the temperature in the reaction bottle is 60~65°C, first add the oxidizing agent solution, after stirring for 5 minutes, then dropwise add the solution of monomer B and monomer C and the solution of reducing agent and chain transfer agent at th...

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Abstract

The invention discloses a polycarboxylate superplasticizer. The superplasticizer is prepared from monomers A, B and C as shown in the formulae (1), (2) and (3) by virtue of random copolymerization, and the molar ratio of A to B to C is 2.5:(7.5-10):1, wherein the symbols in the formulae are as definitions in the specification. The invention also discloses a method for preparing the polycarboxylate superplasticizer, which comprises the following steps: (1) dissolving the alkenyl-terminated polyoxyethylene ether serving as the monomer A in deionized water in a reaction container, heating to 60-65 DEG C under stirring; (2) adding a hydrogen peroxide aqueous solution, and stirring for about 3-5 minutes; (3) simultaneously dripping crylic acid serving as the monomer B and an aqueous solution serving as the monomer C to substitute crylic acid, and an aqueous solution for ascorbic acid and chain transfer agent; and (4) stirring and insulating for about 1-2 hours after the dripping is finished, cooling, and neutralizing with sodium hydroxide to obtain the polycarboxylate superplasticizer. According to the polycarboxylate superplasticizer, the contact among cement particles can be reduced due to the steric hindrance of a benzene ring in the structure of the polycarboxylate superplasticizer, so that the dispersion and slump protection of concrete can be improved.

Description

technical field [0001] The invention relates to a concrete water reducer and a preparation method thereof, more specifically, the invention relates to a polycarboxylate water reducer with high dispersibility and high slump retention and a preparation method thereof. Background technique [0002] With the progress of the times and the improvement of work efficiency, the application of concrete has become more and more extensive. On-site pouring, one-time pouring of large dams, pumping concrete, etc. have become necessary work forms for projects, which makes concrete must have good Flow properties and retention properties. However, due to the large number of cement manufacturers in our country, the product performance cannot help but be the same, and sand and gravel will also affect the transmission performance of concrete. At the same time, because in the existing polymerization reaction, the polymerized monomers are mainly small monomers such as acrylic acid and acrylamide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/04C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明蔡庆洁于连林
Owner LIAONING OXIRANCHEM INC
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