Alkenyl carbonate polyethers, and preparing method and applications thereof

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 effects of enhancing toughness, easy degradation, and improving dispersion performance

Active Publication Date: 2016-06-08
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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  • Alkenyl carbonate polyethers, and preparing method and applications thereof
  • Alkenyl carbonate polyethers, and preparing method and applications thereof
  • Alkenyl carbonate polyethers, and preparing method and applications thereof

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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 alkenyl carbonate polyethers. The general structure of the alkenyl carbonate polyethers is shown as follows, wherein R<1> is H or C1-C3 alkyl, R<2> is a C1-C5 alkylidene group, R<3> is a C2-C4 alkylidene group, a phenylene group or a benzylidene group, M is a polyether chain comprising one or more selected from -CH2CH2O-, -CH(CH3)CH2O- and -CH2(CH3)CHO-. The alkenyl carbonate polyethers comprise a carbonate group, thus facilitating enhancement of molecular chain toughness, and enhancing steric hindrance of synthesized water reducer molecules; and the carbonate group increases the side chain density of synthesized water reducers, and therefore dispersing performance of the water reducers can be improved. The carbonate group in the polyethers is high in electronegativity so that the prepared water reducers have certain functions of resisting slime adsorption. The polyethers are nontoxic, harmless, easily degradable and environmental friendly.

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 Applications(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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