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Glycidyl capped polyether, and synthesis method and applications thereof

A technology of glycidyl sealing and synthesizing method, which can be applied in the direction of coating, etc., can solve the problems of unsatisfactory foam suppression and shrinkage performance of end-capped polyethers.

Inactive Publication Date: 2010-08-18
广东省石油化工研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-foaming performance and shrinkage-reducing performance of the existing end-capped polyethers are not ideal enough.

Method used

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  • Glycidyl capped polyether, and synthesis method and applications thereof
  • Glycidyl capped polyether, and synthesis method and applications thereof
  • Glycidyl capped polyether, and synthesis method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the reactor equipped with stirrer, reflux band water device, add 50g octane / decyl alcohol polyether (ethylene oxide EO / propylene oxide PO=5 / 0), 80g toluene and 10.6g50wt% sodium hydroxide Aqueous solution (the molar ratio of polyether and sodium hydroxide is 1:1), heated up to 110°C for reaction, the reaction time is 1-3h, while refluxing with water, until the water content in the system is lower than 0.5%, dropwise add 13.5 g (the molar weight is equivalent to that of polyether) epichlorohydrin, after the dropwise addition is completed, react at a constant temperature of 110° C. for 8 hours. Filter to remove solid impurities, distill under reduced pressure to remove the solvent, add 100ml of distilled water to wash, stir and stand still to separate layers, remove the water phase, vacuum dry and dehydrate to obtain a blocked polyether product.

Embodiment 2

[0024] In the reactor equipped with stirrer and distillation device, add 240g decanol polyether (EO / PO=8 / 0), 200g xylene and 22.8g sodium methylate (the molar ratio of polyether and sodium methylate is 1:1 ), heat up to 80°C for reaction, the reaction time is 2-3.5h, and distill methanol at the same time until no methanol is distilled out, add 75g (molar weight equivalent to 2 times that of polyether) epichlorohydrin dropwise, and heat up after the dropwise addition Reaction at 140°C for 13h. Remove solid impurities by filtration, remove the solvent by distillation under reduced pressure, add 400ml of distilled water to wash, stir and static layer, remove the water phase, vacuum dry and dehydrate to obtain the end-capped polyether product.

Embodiment 3

[0026] In the reactor that stirrer, distillation unit are equipped with, add 320g butanol polyether (EO / PO=3 / 6), 300g toluene and 120g50wt% sodium methylate alcohol solution (the mol ratio of polyether and sodium methylate is 1: 2), heat up to 100°C to react, the reaction time is 3-4.5h, and distill methanol at the same time until no methanol is distilled out, add 81.5g (the molar weight is equivalent to 1.5 times of polyether) epichlorohydrin dropwise, and the dropwise addition is completed Afterwards, the temperature was raised to 120° C. for 13 hours. Filter to remove solid impurities, distill under reduced pressure to remove the solvent, add 500ml of distilled water to wash, stir and stand still to separate layers, remove the water phase, vacuum dry and dehydrate to obtain a blocked polyether product.

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Abstract

The invention provides a glycidyl capped polyether, and a synthesis method and applications thereof. The synthesis method comprises the following steps: (1) adding alkali in polyether to react in a solvent system, wherein the alkali is taken from one or the mixture of the solids and water solution of sodium hydroxide and potassium hydroxide and the solids and alcoholic solution of sodium methoxide and potassium methoxide, and the reaction temperature is 80-120 DEG C, and the mol ratio of the polyether to the alkali is 1:1-2; (2) adding epichlorohydrin into the reaction system to continue the reaction, wherein the reaction temperature is 80-140 DEG C, and the mol ratio of the polyether to the epichlorohydrin is 1:0.9-2.1; and (3) and refining the reactants to obtain the glycidyl capped polyether which has the structure as disclosed in formula (II), wherein R1 is a C4-C18 alkyl group, n is equal to 0-25, and m is equal to 0-25. When being used in aqueous emulsion paint, the glycidyl capped polyether does not produce shrinkage cavities, has the functions of enhancing defoaming capability and inhibiting foams for a long time, and can be used for preparing defoamers of water paint.

Description

technical field [0001] The invention belongs to the technical field of synthesizing capped polyether, and in particular relates to a glycidyl capped polyether and its synthesis method and application. Background technique [0002] The capped polyether has high chemical stability due to the replacement of the hydroxyl group at the end of the chain, and this type of capped polyether also has a lower cloud point, a lower foaming ability, an enhanced oil removal ability, a lower critical micelle concentration and chemical properties. It is more stable and suitable for high temperature and long-term use under different pH values, so it has a wide range of applications. Such as foam stabilizer, emulsifier, cosmetic raw material, paint leveling agent, defoamer, antistatic agent, plastic modifier, fuel additive, fabric finishing agent, water-soluble lubricant, release agent for polyurethane foam , Pesticide auxiliaries and so on. [0003] In the existing technology, end-capped pol...

Claims

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Application Information

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IPC IPC(8): C08G65/338C09D7/12
Inventor 李莉
Owner 广东省石油化工研究院
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