Ternary random copolymer and its preparation method

A technology of random copolymer and copolymer, which is applied in the field of ternary random copolymer and its preparation, can solve the problems of narrow adaptability of cement, early strength performance of water reducing agent synthesis, high production cost, and achieve high slump retention cement. adaptive effect

Active Publication Date: 2013-07-03
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the methods and products disclosed in these patents are basically new methods in the field of compound early-strength agents, but do not have early-strength performance in the synthesis of water-reducing agents, which is not conducive to large-scale production; or the cement has narrow adaptability; or adopts Toxic raw materials, not only environmentally unfriendly, but also expensive to produce

Method used

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  • Ternary random copolymer and its preparation method
  • Ternary random copolymer and its preparation method
  • Ternary random copolymer and its preparation method

Examples

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Effect test

Synthetic example 1

[0071] The KOH of 9g methyl ethylene glycol monovinyl ether and 0.95g is joined in the autoclave, with N 2 After the replacement is qualified, start to heat up the reactor and start the mixer at the same time. When the temperature of the kettle rises to 100°C, start to add 2g of propylene oxide to the reactor. After the temperature rises and the pressure drops, continuously and stably add 95g of propylene oxide to the reactor. During the feeding, the reaction temperature is controlled to be 130~ 140°C, after the feeding is completed, under constant temperature conditions, carry out the aging reaction for 35 minutes, and when the pressure of the kettle no longer drops, start to cool down the materials in the reactor. After the temperature of the reactor is lowered to 90°C, acetic acid is added to carry out neutralization reaction until the pH of the polyether product is 6.4, and a vinyl polyether product of the present invention is obtained, the structure of which is shown in t...

Synthetic example 2

[0074] Add 2g of ethylene glycol monovinyl ether and 0.4g of KOH into the autoclave, and use N 2 After the replacement is qualified, start to heat up the reactor and start the mixer at the same time. When the temperature of the kettle rose to 110°C, start to add 2g of ethylene oxide and propylene oxide mixture to the reactor. After the temperature rose and the pressure dropped, add 63g of ethylene oxide and propylene oxide continuously and stably. The mixture is put into the reactor, and the reaction temperature is controlled at 130-140°C during the feeding period. After the feeding is completed, the aging reaction is carried out under constant temperature conditions for 40 minutes. After the temperature of the reactor is lowered to 85°C, dilute sulfuric acid is added to carry out neutralization reaction until the pH of the polyether product is 6.5, and a vinyl polyether product of the present invention is obtained, the structure of which is shown in the following formula. Th...

Synthetic example 3

[0077] The 4-hydroxybutyl vinyl ether of 3g and the KOH of 0.25g are joined in the autoclave, with N 2 After the replacement is qualified, start to heat up the reactor and start the mixer at the same time. When the temperature of the kettle rises to 110°C, start to add 2g of ethylene oxide and 2g of propylene oxide to the reactor. After the temperature rises and the pressure drops, add 66g of ethylene oxide and 40g of oxyethane continuously and stably. Add propane to the reaction kettle, among them, propylene oxide needs to be added after the ethylene oxide polymerization reaction is completed. During each feeding period, the reaction temperature is controlled at 150-160 ° C. After each feeding is completed, the aging reaction is carried out under constant temperature conditions. After 30 minutes, when the pressure of the kettle no longer drops, start to cool down the materials in the reactor. The temperature of the reactor is lowered to 90°C and acetic acid is added to carry ...

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Abstract

The invention discloses a ternary random copolymer and its preparation method. The ternary random copolymer is composed of the structural units of three monomers, i.e. X, Y and Z respectively shown in formula (1)-(3). The mole ratio of the three structural units, i.e. X:Y:Z is 1:2-5:0.4-1, and the copolymer has a weight average molecular weight of 10000-30000, with the meaning of each symbol in the formulas being shown in the specification. The copolymer is prepared from the three monomers through aqueous solution copolymerization in the presence of an initiator. The copolymer can be used as an early strength type concrete polycarboxylic water reducer. Because of the introduction of an amide structural unit, the water reducer can reduce the coagulation retarding effect of concrete and improve the early strength of concrete. In addition, as the copolymer has reasonable main and side chain density distribution, the water reducer also has the characteristics of high water reduction, high slump retaining and strong adaptability to cement.

Description

technical field [0001] The present invention relates to a ternary random copolymer and its preparation method, more specifically, the present invention relates to a copolymer which can be used for concrete early-strength water reducing agent and its preparation method. Background technique [0002] With the development of concrete in my country in recent years, the performance of concrete in all aspects has been continuously improved, and the requirements for concrete water reducing agents are also getting higher and higher. Polycarboxylate superplasticizer has low dosage, high water reducing rate, small slump loss, good adaptability to cement, can greatly increase the amount of fly ash, mineral powder and other mixed materials, and can greatly save cement. With the advantages of high-strength and ultra-high-strength concrete, it is widely used in high-strength, high-durability, and high-cement adaptability concrete projects such as high-speed railways, bridges, and water co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 朱建民刘兆斌董振鹏仲崇刚周立明孙桂娥范雷
Owner LIAONING OXIRANCHEM INC
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