Design and preparation of coagulation time controllable high performance polycarboxylic acid water reducing agent

A technology of coagulation time and water reducer, which is applied in the design and preparation of polycarboxylate high-performance water reducer, can solve the problems of unstable polymerization, difficulty in controlling the quality of water reducer, and influence of polymerization, and achieve technological operation flow Simple and environmentally friendly, avoiding the effect that the quality is difficult to control

Inactive Publication Date: 2009-05-20
武汉格瑞林建材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the prepared monomer II continues to carry out free radical polymerization with other monomers in the next step process, due to the existence of the polymerization inhibitor, the polymerization is affected, resulting in unstable polymerization, and the quality of the prepared water reducer is difficult to control

Method used

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  • Design and preparation of coagulation time controllable high performance polycarboxylic acid water reducing agent
  • Design and preparation of coagulation time controllable high performance polycarboxylic acid water reducing agent
  • Design and preparation of coagulation time controllable high performance polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Embodiment one: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 1000g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 1000), the maleic anhydride of 98g (1.0mol), 3.294g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.

[0085] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-1 with a molecular weight of 38,000.

[0086] Test: A...

Embodiment 2

[0089] Embodiment two: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 1200g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 1200), the maleic anhydride of 98g (1.0mol), 3.894g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.

[0090] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-2, and its molecular weight is 41,000.

[0091] Test:...

Embodiment 3

[0094] Embodiment three: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 2000g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 2000), the maleic anhydride of 98g (1.0mol), 6.294g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.

[0095] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-3 with a molecular weight of 44,000.

[0096] Test:...

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Abstract

The invention relates to the design and synthesis of a poly carboxylic acid water reducing agent, the coagulating time of which can be controlled. The poly carboxylic acid water reducing agent is prepared by co-polymerize the following three monomers in water: the monomer a occupying 30 to 70 percent and indicated by a general expression 1, the monomer b occupying 10 to 50 percent and indicated by the general expression 2, and the monomer c occupying 10 to 40 percent and indicated by the general expression 3. The coagulating time is controlled by the monomer a which is made by condensing maleic anhydride and polyoxyethylene monoalkyl ether. The length of a polyoxyethylene monoalkyl ether chain controls the change of the coagulating time: the longer the chain, the shorter the coagulating time is; and the shorter the chain is, the longer the coagulating time is. The monomer a does not contain inhibitive substances in the process of synthesis, therefore, the water reducing agent is easy to be controlled in the coagulating process. The poly carboxylic acid water reducing agent is suitable for the construction of concrete under different temperature conditions: under higher temperature, the water reducing agent with longer coagulating time can be adopted, and under lower temperature, the water reducing agent with shorter coagulating time can be adopted. The poly carboxylic acid water reducing agent has good adaptability to cement and admixtures and has the advantages of low mixing quantity, good slump constant hold facility and water segregation resistance, and the like.

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, and in particular relates to the design and preparation method of a novel polycarboxylate high-performance water reducer with controllable setting time for building concrete. Background technique [0002] High-performance water reducer, also known as superplasticizer, is used in concrete mixture and mainly plays three different roles: ① In order to improve the pouring performance of concrete, it can improve the concrete composition without changing the concrete composition. concrete workability. ② Under the condition of given workability, reduce the water-cement ratio of mixing water and concrete, and improve the strength and durability of concrete. ③ Under the condition of ensuring the performance and strength of concrete pouring, reduce the amount of water and cement, and reduce the factors of initial defects of concrete caused by creep, dry shrinkage, heat of hydration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/30
CPCC04B24/2641C04B2103/006C04B2103/32
Inventor 奚强张绪建邝生鲁黄靖烈林安刘裴刘捷闵润卢洪宇
Owner 武汉格瑞林建材科技股份有限公司
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