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A kind of alkenyl carbonate polyether and its preparation method and application

A technology of alkenyl carbonate and polyether, which is applied in the field of alkenyl carbonate polyether and its preparation, can solve the problems that the performance of water reducing agent cannot meet the application needs, and achieve the advantages of enhanced toughness, easy degradation, and increased side chain density Effect

Active Publication Date: 2017-11-28
JIANGSU OXIRANCHEM CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of the concrete industry, the performance of conventional monomer-synthesized water reducers can no longer meet the application needs

Method used

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  • A kind of alkenyl carbonate polyether and its preparation method and application
  • A kind of alkenyl carbonate polyether and its preparation method and application
  • A kind of alkenyl carbonate polyether and its preparation method and application

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preparation example Construction

[0031] The present invention further provides a kind of preparation method of alkenyl carbonate polyether, and the steps are as follows: add an appropriate amount of initiator and catalyst in the high-pressure reactor (determine the minimum addition of initiator according to the size ratio and the proportioning situation of the reactor , the amount of catalyst is 0.01-0.2% of the finished product), seal the equipment, then replace with nitrogen, and raise the temperature. When the temperature reaches 80-130°C, feed a small amount of alkylene oxide raw material. Add the alkylene oxide raw material in the ratio (determined according to the raw materials of different molecular weights), control the reaction temperature at 60-180°C and the pressure in the kettle at 0.2-0.6MPa, and after the reaction is completed, the pressure in the kettle will gradually drop to no more than 30 minutes continuously. After falling further, the material is aged and cooled to obtain the polyether. Wh...

Embodiment 1

[0043] In the reaction kettle with negative pressure conditions, start stirring, add dimethyl carbonate and sulfuric acid, slowly raise the temperature to 80-90°C, add 1-alkenyl-2-methylhexanol and p-hydroxy Benzyl alcohol. Wherein, the molar ratio of the three reactants is: dimethyl carbonate: 1-alkenyl-2-methylhexanol: p-hydroxybenzyl alcohol=1:1.5:1.5, and the catalyst addition is 0.2% of the total mass of the feed . As the reaction proceeds, the product methanol is continuously discharged from the system. When the methanol no longer flows out, the temperature is lowered for 20 minutes and the material is discharged. According to the difference in boiling point, the product is subjected to vacuum distillation to separate by-products to obtain the carbonate initiator (Formula 1).

[0044] 215 g of carbonate (Formula 1) starter and 1.0 g of KOH were added to the high pressure reactor. Seal the device and replace it with nitrogen 3 times. Start stirring, heat up, and when ...

Embodiment 2

[0048] In the reaction kettle with negative pressure conditions, start stirring, add dimethyl carbonate and sulfuric acid, slowly raise the temperature to 80-90°C, add 1-alkenyl-2-methylhexanol and p-hydroxy Benzyl alcohol. Wherein, the molar ratio of the three reactants is: dimethyl carbonate: 1-alkenyl-2-methylhexanol: p-hydroxybenzyl alcohol=1:1.5:1.5, and the catalyst addition is 0.2% of the total mass of the feed . As the reaction proceeds, the product methanol is continuously discharged from the system. When the methanol no longer flows out, the temperature is lowered for 20 minutes and the material is discharged. According to the difference in boiling point, the product is subjected to vacuum distillation to separate by-products to obtain the carbonate initiator (Formula 1).

[0049] 107 g of carbonate (formula 1) starter and 1.5 g of KOH were added to the high pressure reactor. Seal the device and replace it with nitrogen 3 times. Start stirring, heat up, and when ...

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Abstract

The invention provides an alkenyl carbonate polyether, which has the following structure: wherein, R1 is H or C1-C3 alkyl; R2 is C1-C5 alkylene; R3 is C2-C4 alkylene group, phenylene or benzylidene; M is a polyether chain comprising one or more of the structural units -CH2CH2O-, -CH(CH3)CH2O-, -CH2(CH3)CHO-. The alkenyl carbonate polyether of the present invention contains carbonate groups, which is conducive to enhancing the toughness of the molecular chain, thereby enhancing the steric hindrance of the synthetic water reducer molecules, and the carbonate groups increase the side chains of the synthetic water reducer The density is beneficial to improve the dispersion performance of the water reducer; the carbonate group in the polyether has a strong electronegativity, so that the made water reducer has a certain anti-slime adsorption effect. Moreover, the polyether of the present invention is non-toxic, harmless, easy to degrade and friendly to the environment.

Description

technical field [0001] The invention relates to an alkenyl carbonate polyether and its preparation method and application, in particular to an alkenyl carbonate polyether used for preparing a polycarboxylate water reducer and its preparation method. Background technique [0002] With the rapid development of my country's economy and the accelerated pace of infrastructure construction, the requirements for ecological and high-performance concrete admixtures are becoming more and more urgent. The research and application of concrete admixtures have improved the quality of construction projects and at the same time promoted the progress of construction technology, especially the research and application of high-efficiency water reducers are an important part of the scientific research of building materials, and have promoted the development of building materials to high-strength, high-strength, High performance is constantly developing, among which polycarboxylate high-efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08F283/06
Inventor 朱建民刘兆滨董振鹏富扬刘丙柱
Owner JIANGSU OXIRANCHEM CO LTD
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