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Polycarboxylate water reducer and its preparation method and cement admixture

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture and polycarboxylate water reducing agent, can solve the problems of large concrete slump loss, poor appearance, and high air-entraining content.

Active Publication Date: 2020-04-24
联泓(江苏)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new polycarboxylate water reducer with high water reducing rate, good concrete workability, long slump retention time, low air entrainment, wide adaptability to ground materials, and stable performance and its preparation method , to solve the problems of large concrete slump loss, high air-entrained content, poor workability, and poor appearance

Method used

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  • Polycarboxylate water reducer and its preparation method and cement admixture
  • Polycarboxylate water reducer and its preparation method and cement admixture
  • Polycarboxylate water reducer and its preparation method and cement admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 1.1 Preparation of monomer (A-1#)

[0079] Put 215 parts of dimethylallyl alcohol in a three-necked flask equipped with a nitrogen protection device, a thermometer and a stirrer, add 3 parts of NaH powder, quickly replace with nitrogen, turn on the heating, stir and raise the temperature to 90°C, and then add to the flask 310 parts of butyl glycidyl ether were slowly added dropwise at a medium and uniform speed, the reaction temperature was controlled to 90°C, the dropping time was 120 minutes, after the dropping was completed, the temperature was kept for 2 hours, and the intermediate 1 was obtained by cooling.

[0080] Add 416 parts of the above-mentioned synthetic intermediate to the autoclave, add 7.0 parts of NaH powder, replace with nitrogen, and then, while stirring, evacuate the reactor, turn on the heating, and start to slowly pass into the reactor after the temperature reaches 120°C 970 parts of ethylene oxide were polymerized and the temperature was maintained at ...

Embodiment 2

[0086] 2.1 Preparation of monomer (A-2#)

[0087] Put 300 parts of dimethylallyl alcohol in a three-necked flask equipped with a nitrogen protection device, a thermometer and a stirrer, add 4.5 parts of NaH powder, quickly replace with nitrogen, turn on the heating, stir and raise the temperature to 100°C, then add to the flask Add 744 parts of butyl glycidyl ether slowly at a medium and uniform speed, control the reaction temperature to 100°C, and add the time for 180 minutes. After the addition, keep it for 2 hours and cool to obtain Intermediate 1.

[0088] Add 500 parts of the above-mentioned synthesized intermediate to the autoclave, replace with nitrogen, then evacuate the reactor under stirring, turn on the heating, and then slowly pass 993 parts of ethylene oxide into the reactor after the temperature is raised to 120°C Carry out the polymerization reaction, maintain the temperature at 120° C. and the pressure at a relatively constant value of about 0.3 MPa, until all ethyl...

Embodiment 3

[0094] 3.1 Preparation of monomer (A-3#)

[0095] Place 403 parts of dimethylallyl alcohol in a three-necked flask equipped with a nitrogen protection device, a thermometer and a stirrer, add 3.4 parts of NaH powder, quickly perform nitrogen replacement, turn on the heating, stir and raise the temperature to 100°C, and then add to the flask Add 325 parts of butyl glycidyl ether slowly at a medium uniform speed, control the reaction temperature to 100°C, and add the time for 180 minutes. After the addition, keep it for 2 hours and cool to obtain Intermediate 1.

[0096] Add 360 parts of the above synthesized intermediate to the autoclave, replace with nitrogen, then evacuate the reactor while stirring, turn on the heating, and then slowly pour 1035 parts of ethylene oxide into the reactor. Carry out the polymerization reaction, maintaining the temperature at 120°C and the pressure relatively constant at about 0.4 MPa, until all ethylene oxide is added to the reactor, and the tempera...

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Abstract

The invention relates to the technical field of a concrete admixture and particularly relates to a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer provided by the invention is formed by polymerizing the raw materials including monomer A and monomer B, wherein the structural formula of the monomer A is as shown in the specification. The novel polycarboxylate superplasticizer provided by the invention is characterized by high water-reducing rate, good concrete workability, long slump retaining period, low air entrainment, wide flooring adaptability, performance stability, simple preparation process, strong controllability, short production period, low cost and suitability for industrial production.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures and the field of polycarboxylic acid water reducers, in particular to a novel polycarboxylic acid water reducer, a preparation method thereof, and a cement admixture. Background technique [0002] Concrete water reducer is the most widely used and most used additive among concrete admixtures. In recent years, the research and production of concrete admixtures have tended to develop in the direction of high performance, environmental protection, and pollution-free. Polycarboxylic acid water-reducing agent is an admixture with carboxylic acid graft polymer as the main body. It is generally formed by the copolymerization of polyether macromonomers containing terminal alkenyl groups and unsaturated carboxylic acid (salt) small monomer aqueous solutions. It has the advantages of low dosage, high water reduction rate, and good concrete slump retention performance. It can effectively reduce the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B28/02C08F283/06
CPCC04B24/32C04B28/02C04B2201/50C08F283/065C08F220/06C04B14/06C04B14/02
Inventor 李华威朱军成黄海李方
Owner 联泓(江苏)新材料研究院有限公司
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