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Preparation method and application of mud-resistant polycarboxylate superplasticizer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of small slump loss, large slump loss, and low strength, and achieve the effects of reducing adsorption, improving rigidity, and increasing thickness

Active Publication Date: 2016-04-20
JIANGSU SOBUTE NEW MATERIALS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This product has good dispersibility in mud-containing concrete, low slump loss, good adaptability to cement types in various regions, and no pollution in the production process, but the product has high production costs and low water-reducing rate. shortcoming
[0006] Chinese patent document CN103467670B discloses another preparation method of anti-mud type polycarboxylate water reducer, the method first uses epibromohydrin and tertiary amine compound to react in alcohol / water mixed solvent to obtain quaternary ammonium salt oligomerization Then, the quaternary ammonium salt oligomer, isopentenol polyoxyethylene ether, amino trimethylene phosphonic acid, and unsaturated acid are copolymerized by free radicals to obtain the mud-resistant polycarboxylate water reducer. It can reduce the adverse effect of the mud content in the aggregate on the polycarboxylate superplasticizer, and can solve the problems of insufficient water reduction, large slump loss, and low strength of concrete without increasing the dosage. The product has disadvantages such as cumbersome production steps and heavy pollution in the production process

Method used

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  • Preparation method and application of mud-resistant polycarboxylate superplasticizer
  • Preparation method and application of mud-resistant polycarboxylate superplasticizer
  • Preparation method and application of mud-resistant polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Synthesis of PVP macromonomer:

[0068] In the flask that stirrer is equipped with, add NVP monomer 300g, mercaptoethanol 42.2g, azobisisoheptanonitrile 22.4g (NVP, chain transfer agent, initiator molar ratio are 30:6:1) and solvent ethanol 1200mL, Access to N 2 30min to remove the O in the solution 2 , followed by sealing the system, stirring and raising the temperature to 45°C, and reacting at this temperature for 12h. After the reaction is finished, the solvent is recovered by rotary evaporation to obtain the PVP polymer. Next, 38.9 g of acrylic acid (the same molar weight as mercaptoethanol), 0.78 g of phenothiazine, 5.9 g of p-toluenesulfonic acid, and 300 g of water-carrying agent toluene were added to the system. Water 9.45g, after the reaction finishes, rotary steaming removes toluene, obtains PVP-1 macromonomer, M w is 1190, m=10.

[0069]Synthesis of water reducing agent:

[0070] In the flask that agitator is housed, add the above-mentioned synthetic PV...

Embodiment 2

[0072] Synthesis of PVP macromonomer:

[0073] In the flask equipped with stirrer, add NVP monomer 300g, mercaptoethanol 21.0g, azobisisobutyronitrile 5.54g (NVP, chain transfer agent, initiator molar ratio is 80:8:1) and solvent ethanol 1300mL, Access to N 2 30min to remove the O in the solution 2 , then close the system, stir and heat up to 53°C, and react at this temperature for 20h. After the reaction is finished, the solvent is recovered by rotary evaporation to obtain the PVP polymer. Next, add 20.4g of acrylic acid (1.05 times the molar weight of mercaptoethanol), 0.21g of hydroquinone, 8.5g of p-aminobenzenesulfonic acid, 430g of water-carrying agent toluene, and reflux at 130°C for 20h to remove the reaction product 4.57g of water, after the reaction is finished, the toluene is removed by rotary evaporation to obtain the PVP-2 macromonomer, M w is 1860, m=16.

[0074] Synthesis of water reducing agent:

[0075] In the flask that agitator is housed, add the above...

Embodiment 3

[0077] Synthesis of PVP macromonomer:

[0078] In the flask that stirrer is equipped with, add NVP monomer 300g, mercaptoethylamine 10.4g, azodicyanovaleric acid 3.8g (NVP, chain transfer agent, initiator molar ratio are 200:10:1) and solvent ethanol 1500mL, feed N 2 30min to remove the O in the solution 2 , then close the system, stir and heat up to 60°C, and react at this temperature for 24h. After the reaction is finished, the solvent is recovered by rotary evaporation to obtain the PVP polymer. Next, add 12.2g of acrylic acid (1.25 times the molar weight of mercaptoethylamine), 0.12g of p-hydroxyanisole, 9.6g of concentrated sulfuric acid, 460g of water-carrying cyclohexane, and reflux at 120°C for 24h to remove the reaction Generated water 2.31g, after the reaction is finished, the toluene is removed by rotary evaporation to obtain the PVP-3 macromonomer, M w is 2790, m=24.

[0079] Synthesis of water reducing agent:

[0080] In the flask that stirrer is housed, add...

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Abstract

The invention provides a preparation method and application of a mud-resistant polycarboxylate superplasticizer. The mud-resistant polycarboxylate superplasticizer has the advantages of being low in mixing amount, high in water-reducing rate, long in slump resisting time and high in mud resistance when serving as a cement dispersing agent. The synthesis process is simple, the raw material utilization rate is high, a solvent is convenient to recycle, and production cost is low. According to the preparation method of the mud-resistant polycarboxylate superplasticizer, the mud-resistant polycarboxylate superplasticizer is obtained through the free radical polymerization reaction of specific unsaturated acid monomers, specific unsaturated polyether macromonomers and poly(N-vinyl pyrrolidone) chain containing PVP macromonomers, and the molar weight of the unsaturated polyether macromonomers is 50% to 100% that of the PVP macromonomers.

Description

technical field [0001] The invention relates to a preparation method and application of a mud-resistant polycarboxylate water reducer, belonging to the technical field of concrete admixtures. Background technique [0002] The addition of chemical admixtures can greatly improve the durability, workability, applicability, economy and strength of concrete, and provide a strong guarantee for the quality of large-scale projects. Therefore, its wide application is known as the successor to reinforced concrete and prestressed concrete. The 3rd major breakthrough in concrete technology after concrete. [0003] Polycarboxylate superplasticizer has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. Polycarboxylate superplasticizer is a comb-shaped water-soluble polymer, which is composed of a main cha...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F290/04C08F220/06C08F222/02C08F222/06C04B24/32
CPCC04B24/32C04B2103/302C08F283/065C08F290/04C08F220/06C08F222/02C08F222/06
Inventor 刘加平李申桐冉千平杨勇舒鑫张建刚赵红霞
Owner JIANGSU SOBUTE NEW MATERIALS
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