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Method for preparing oxazolidine

A technology of oxazolidine and raw materials, which is applied in the field of preparation of oxazolidine, can solve the problems of system gel, low stability, disadvantages, etc., and achieve the effect of expanding the scope of use

Inactive Publication Date: 2005-04-06
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, oxazolidines are generally produced at home and abroad by dehydration and cyclization of small molecule aldehydes, ketones, and alcohol ammonia compounds such as formaldehyde, isobutyraldehyde, and acetone, and the synthesized oxazolidines are added to polyurethane synthesized by TDI. The stability of the formed coexistence system is low, and the odor of the small molecule aldehydes and ketones formed after the synthesis of oxazolidine or its addition to the polyurethane synthesized by TDI is very irritating. , especially the coexistence system formed by adding the synthesized oxazolidine to epoxy resin or polyurethane, especially the coexistence system formed by adding polyurethane synthesized from aromatic isocyanate, its coexistence is extremely poor, and it is very easy to cause System gel, which is not conducive to or even impossible to form a single-component coexistence system

Method used

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  • Method for preparing oxazolidine
  • Method for preparing oxazolidine
  • Method for preparing oxazolidine

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: a kind of preparation method of oxazolidine, comprising (1) raw material selection: raw material comprises: the carbonyl compound with benzene ring, and its structural formula is:

[0023] Wherein, E represents phenyl, and diethanolamine, and the molar ratio of the two is 1: 1; (2) mixing process: adding diethanolamine to the reactor, then, the above-mentioned carbonyl compound with a benzene ring is added according to the above mole The equivalence ratio is slowly added to the reactor to form a mixed solution with diethanolamine. During the addition process, the temperature of the mixed solution in the reactor is always kept in the range of 30°C to 45°C; (3) Reaction process: when the temperature is 50°C Under the condition of ℃, the mixed solution was reacted, and the reaction time was: 1 hour; (4) suction filtration process: the water content in the reacted liquid in the reactor was extracted with a vacuum suction filtration device, and then the reacto...

Embodiment 2

[0024] Embodiment 2: a kind of preparation method of oxazolidine, including (1) raw material selection: raw material comprises: the carbonyl compound with benzene ring, and its structural formula is:

[0025] Wherein, E represents benzyl, and N,N'-dihydroxyethylethylenediamine, the molar ratio of the two is 1:2; (2) mixing process: N,N'-dihydroxyethylethylenediamine The amine is added to the reactor, then, the above-mentioned carbonyl compound with a benzene ring is slowly added to the reactor according to the above-mentioned molar equivalent ratio to form a mixed solution with N,N'-dihydroxyethylethylenediamine. During the adding process, Always keep the temperature of the mixed solution in the reactor in the range of 30°C-45°C; (3) reaction process: under the condition that the temperature is 80°C, the mixed solution is reacted, and the reaction time is: 2 hours; ( 4) Suction filtration process: use a vacuum suction filtration device to extract the moisture in the reaction...

Embodiment 3

[0026] Embodiment 3: a kind of preparation method of oxazolidine, including (1) raw material selection: raw material comprises: the carbonyl compound with benzene ring, and its structural formula is:

[0027] Wherein, E represents phenoxy, and 2-amino-2-hydroxymethyl-1,3-propanediol, and the molar ratio of the two is 1:2; (2) mixing process: 2-amino-2-hydroxymethyl base-1,3-propanediol is added to the reactor, then, the above-mentioned carbonyl compound with a benzene ring is slowly added to the reactor according to the above molar equivalent ratio and 2-amino-2-hydroxymethyl-1,3-propanediol A mixed solution is formed, and during the addition process, the temperature of the mixed solution in the reactor is always kept in the range of 30°C-45°C; (3) Reaction process: under the condition that the temperature is 65°C, the mixed solution is reacted , the reaction time is: 1.5 hours; (4) suction filtration process: use the vacuum suction filtration device to extract the moisture ...

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Abstract

This invention relates to a preparation method of oxazolidine. It includes (1) materials selecting, (2) mixing process, (3) reaction process, (4) drawing and filtration process. Comparing to existing technology, every capability of the oxazolidine in application by this method is raised greatly, and there is no irritant smell after decomposition when meet water. The using range of oxazolidine is enlarged, and it can composes monocomponent system with polyurethane that made by aromatic diisocyanate in sine aq condition.

Description

technical field [0001] The present invention relates to a preparation method of oxazolidine. Background technique [0002] Oxazolidine, due to its excellent chemical properties, is widely used in grouting materials, water-based coatings, adhesives, and sealant systems as reactive diluents or latent curing agents. However, oxazolidine is generally made from small molecular aldehydes, ketones and alcohol ammonia compounds such as formaldehyde, isobutyraldehyde, acetone, etc. through dehydration and cyclization at home and abroad. The synthesized oxazolidine is added to the polyurethane synthesized by TDI. The stability of the formed coexisting system is low, and the odor of the small molecule aldehydes and ketones generated after the synthesized oxazolidine or the coexisting system formed by adding it to the polyurethane synthesized by TDI is highly irritating and decomposed with water. , especially the coexistence system formed by adding the synthesized oxazolidine into epox...

Claims

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Application Information

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IPC IPC(8): C07D263/04C08K5/353
Inventor 季宝任志钧王芳
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