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Method for reducing content of chlorinated derivative in isocyanate

A technology of isocyanate and derivatives, which is applied in the field of isocyanate, can solve the problems of prolonged reaction time, product loss, and prolonged production cycle, etc., and achieves the effect of high removal rate

Active Publication Date: 2017-11-24
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decrease of reaction temperature will inevitably lead to the extension of reaction time and longer production cycle.
In addition, if the reaction conditions are not well controlled, there is no efficient treatment method for products with increased impurity content of chlorinated derivatives, and a large amount of products will be lost if direct vacuum distillation is used

Method used

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  • Method for reducing content of chlorinated derivative in isocyanate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for reducing the content of chlorinated derivatives in isocyanate, the concrete steps are:

[0030] (1) Take xylylene diisocyanate (the mass content of chlorinated derivative is 1%) 20g, add 40ml dichlorobenzene, then add 10ml acetone;

[0031] (2) Weigh 0.1g of potassium thiocyanate powder, add it to the above isocyanate solution, heat to 130°C, react for 5min, and cool to room temperature;

[0032] (3) Filtrate, remove the solvent, and collect the filtrate to obtain the crude or refined product of isocyanate with qualified content of chlorinated derivatives.

[0033] Chlorinated derivatives could not be detected by gas chromatography.

Embodiment 2

[0035] A method for reducing the content of chlorinated derivatives in isocyanate, the concrete steps are:

[0036] (1) Weigh 20 g of hexamethylene diisocyanate (the mass content of the chlorinated derivative is 1%), add 80 ml of toluene, and then add 15 ml of butanone;

[0037] (2) Weigh 0.2g of potassium thiocyanate powder, add it to the above isocyanate solution, heat to 30°C, react for 180min, and cool to room temperature;

[0038] (3) Filtrate, remove the solvent, and collect the filtrate to obtain the crude or refined product of isocyanate with qualified content of chlorinated derivatives.

[0039] Calculated by gas chromatography quantitative analysis, the mass content of chlorinated derivatives after treatment is reduced to 0.03%.

Embodiment 3

[0041] A method for reducing the content of chlorinated derivatives in isocyanate, the concrete steps are:

[0042] (1) Weigh 200 g of dicyclohexylmethane diisocyanate (the mass content of the chlorinated derivative is 5%), add 600 ml of chlorobenzene, and then add 150 ml of acetone;

[0043] (2) Weigh 11g of potassium thiocyanate powder, add it to the above isocyanate solution, heat to 80°C, react for 120min, and cool to room temperature;

[0044] (3) Filtrate, remove the solvent, and collect the filtrate to obtain the crude or refined product of isocyanate with qualified content of chlorinated derivatives.

[0045] Calculated by gas chromatography quantitative analysis, the mass content of the chlorinated derivatives after treatment was reduced to 0.02%.

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Abstract

The invention belongs to the technical field of isocyanate and especially relates to a method for reducing content of chlorinated derivative in isocyanate and increasing the quality of isocyanate. The method disclosed according to the invention reduces the content of chlorinated derivative in isocyanate in the manner of enabling cyanate or thiocyanate to react with crude or fine product of isocyanate and then simply performing post-processing. The method can be used for removing more than 90% of chlorinated derivative from isocyanate and realizing the impurity content of the chlorinated derivative below 0.1%, is simple in operation and is easy for industrial application. Besides, the isocyanate treated according to the method is capable of improving the anti-ageing property of a downstream macromolecule product thereof due to the reduced content of the chlorinated derivative.

Description

technical field [0001] The invention belongs to the technical field of isocyanate, and in particular relates to a method for reducing the content of chlorinated derivatives in isocyanate and improving the quality of isocyanate. Background technique [0002] Isocyanate is a class of substances containing -NCO groups. Because of its high reactivity, it can react with various active hydrogen compounds and is widely used in pharmaceutical synthesis, coatings, foaming materials, optical resin materials and other fields. In order to improve the yellowing resistance and aging resistance of materials, aliphatic isocyanates are widely used. For example, in the field of optical resin materials, XDI, HDI, IPDI, etc. are widely used to react with various thiols to prepare high refractive index optical resin lenses. [0003] Isocyanate is one of the main raw materials for the production of optical resin lenses, and its quality plays a decisive role in the aging performance and yellowing...

Claims

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Application Information

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IPC IPC(8): C07C263/20C07C265/14C07C263/02C07C331/12
CPCC07C263/02C07C263/20C07C331/12C07C265/14
Inventor 范江涛马韵升包英高艳丽易先君张建林
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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