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Preparation method for polycarboxylic acid high-performance water reducer

A high-performance, water-reducing agent technology, applied in the field of preparation of polycarboxylate high-performance water-reducing agents, can solve the problems of collapse, complicated synthesis process of water-reducing agent, unstable quality of free radical polymerization products, etc. Cost, easy process control, high dispersion effect

Inactive Publication Date: 2008-01-16
JIANGSU CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the constraints of the molecular structure, the problem of slump cannot be fundamentally solved, so people turned their attention to carboxylic acid polymers, which are called the third generation of new polymer water reducers, and achieved great results.
[0004] However, the molecular design of high-performance polycarboxylate water-reducers needs to be realized through preparation methods. The synthesis process of such water-reducers is generally cumbersome, and the shortcomings of free-radical polymerization products such as unstable quality still exist.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A) In the reactor, add methacrylic acid and polyethylene glycol monomethyl ether (molecular weight is 2500) by 1: 1 molar ratio, then add catalyst p-toluenesulfonic acid (consumption is 1% of methacrylic acid weight), Composite polymerization inhibitor (the molar ratio of hydroquinone to copper powder is 1:1, and the dosage is 0.4% of the weight of methacrylic acid), water-carrying agent xylene (the dosage is 2 times of the weight of methacrylic acid), stirring and heating To 120°C, keep the reaction for 10 hours to obtain polyoxyethylene ether methacrylate;

[0023] B) Add 200g of water and initiator sodium persulfate 0.5g in the reactor, then slowly dropwise add 100g of mixed solution containing sodium allyl sulfonate, polyoxyethylene ether methacrylate, and methacrylic acid, and alkene in the mixed solution The weight ratio between sodium propyl sulfonate, polyoxyethylene ether methacrylate and methacrylic acid is 1:8:1, stir and heat to 100°C, react for 5 hours and ...

Embodiment 2

[0025] A) in the reactor, add methacrylic acid and polyethylene glycol monomethyl ether (molecular weight is 3000) by 1: 1 molar ratio, then add catalyst p-toluenesulfonic acid (consumption is 1% of methacrylic acid weight), Composite polymerization inhibitor (hydroquinone and copper powder molar ratio is 1: 2, consumption is 0.4% of methacrylic acid weight), water-carrying agent toluene (consumption is 3 times of methacrylic acid weight), stirring and heating to 100°C, keep the reaction for 10 hours to obtain polyoxyethylene ether methacrylate;

[0026] B) Add 200g of water and 0.4g of initiator ammonium persulfate into the reactor, then slowly add 120g of a mixed solution containing allyl sulfonate, polyoxyethylene ether methacrylate, and methacrylic acid dropwise, and the alkene in the mixed solution The weight ratio between sodium propylsulfonate, polyoxyethylene ether methacrylate and methacrylic acid is 1:8:2, stir and heat to 100°C, react for 5 hours and add chain trans...

Embodiment 3

[0028] A) in the reactor, add methacrylic acid and polyethylene glycol monomethyl ether (molecular weight is 3000) by 1: 1 molar ratio, then add catalyst p-toluenesulfonic acid (consumption is 1% of methacrylic acid weight), Composite polymerization inhibitor (the molar ratio of hydroquinone to copper powder is 1:3, the dosage is 0.4% of the weight of methacrylic acid), water-carrying agent xylene (the dosage is 3 times of the weight of methacrylic acid), stirring and heating To 120°C, keep the reaction for 10 hours to obtain polyoxyethylene ether methacrylate;

[0029] B) 200g of water and 0.8g of initiator sodium persulfate are added in the reactor, then slowly dropwise add 110g of mixed solution containing allyl sulfonate, polyoxyethylene ether methacrylate, and methacrylic acid, and the alkene in the mixed solution is The weight ratio between sodium propylsulfonate, polyoxyethylene ether methacrylate and methacrylic acid is 1:8:2, stir and heat to 100°C, react for 5 hours ...

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Abstract

The invention discloses a preparation method of a poly-carboxylic acid water reducing agent with high performance, the water reducing agent is made in simple process with low mixing amount and high dispersive property. The technical proposal is as the follow: A) methacrylic acid and methoxy polyethylene glycol with a mole ratio of 1 to 1.2: 1 are put into a reactor with catalyst, polymerization inhibitor and water carrying agent being added to be mixed and heated to 100 to 150 DEG C and kept reacting within 8 to 12 hours to obtain polyoxyethylene methacrylate; B) water and initiator are added into the reactor, then a mixing solution containing sodium allylsulfonate, the polyoxyethylene methacrylate and the methacrylic acid is added drop by drop slowly into the reactor, wherein the weight proportion of the water and the mixing solution is 2: 1 to 1.2, the solution is mixed and heated to the temperature of 80 to 120 DEG C. Chain transfer agent is added after reaction of 4 to 6 hours and the adding drop by drop being finished, and the solution is discharged after being kept mixing with heat preserved for 1 to 2 hours, the poly-carboxylic acid water reducing agent with high performance is obtained.

Description

technical field [0001] The invention relates to a preparation method of a water reducer, more specifically to a preparation method of a polycarboxylic acid high-performance water reducer. Background technique [0002] High-performance water reducer is one of the important products in the pillar industry of new building materials, and has become an indispensable fifth component in concrete besides sand, stone, cement and water. With the development of concrete technology, the durability index of concrete is getting higher and higher, and the water-binder ratio of concrete is often reduced to a lower level, but the fluidity of concrete still needs to meet the needs of pumping construction, and the performance of water reducing agent has higher requirements. In addition to the water-reducing effect, it is also necessary to control the slump loss of concrete, and better solve the problems of air-entrainment, retardation, and bleeding of concrete. High performance water reducer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48C04B24/26C04B24/04C04B103/30
Inventor 朱杰殷平福姜莉何明
Owner JIANGSU CHEM RES INST
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