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A method for reducing chromaticity of polythiol compound for optical resin

A technology of polythiol compounds and optical resins, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., to achieve the effect of reducing chromaticity and simple methods

Active Publication Date: 2019-03-08
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But how to reduce the chromaticity of the high polythiol compound of chromaticity that has been produced is still unreported at present

Method used

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  • A method for reducing chromaticity of polythiol compound for optical resin
  • A method for reducing chromaticity of polythiol compound for optical resin
  • A method for reducing chromaticity of polythiol compound for optical resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this implementation, the structural formula of polythiol compound is

[0031]

[0032] Add 10 g of ethanol to 100 g of polythiol compounds, then add 1 g of sodium sulfite, stir at 65° C. for 3 h, filter, and evaporate the solvent.

[0033] The properties before and after the treatment of polythiol compounds are shown in Table 1, and Table 1 is the performance comparison before and after the treatment of polythiol compounds.

[0034] Table 1 is the performance comparison before and after the treatment of polythiol compounds

[0035]

Embodiment 2

[0037] In this implementation, the structural formula of polythiol compound is

[0038]

[0039] Add 18g methanol to 120g polythiol compound, then add 1.8g sodium gluconate, stir at 70°C for 2h, filter, and evaporate the solvent.

[0040] The properties before and after the treatment of polythiol compounds are shown in Table 2, and Table 2 is the performance comparison before and after the treatment of polythiol compounds.

[0041] Table 2 is the performance comparison before and after the treatment of polythiol compounds

[0042]

Embodiment 3

[0044] In this implementation, the structural formula of polythiol compound is

[0045]

[0046] Add 20 g of ethanol to 100 g of polythiol compounds, then add 1 g of sodium borohydride, stir at 85° C. for 1.5 h, filter, and evaporate the solvent.

[0047] The properties before and after the treatment of polythiol compounds are shown in Table 3, and Table 3 is the performance comparison before and after the treatment of polythiol compounds.

[0048] Table 3 The performance comparison before and after the treatment of polythiol compounds

[0049]

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PUM

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Abstract

The invention provides a method for reducing the chroma of a polythiol compound for optical resin. The method comprises the following steps: mixing the polythiol compound, a reducing agent and a solvent, heating, reacting, filtering, and removing the solvent to obtain the chroma-reduced polythiol compound for the optical resin, wherein the reducing agent is selected from sulfite, sodium borohydride, lithium aluminum hydride, sodium gluconate and sodium hydrosulfite. By the method, in allusion to the produced polythiol compound with relatively high chroma or a polythiol compound product with relatively high chroma caused by some reasons, the chroma of the polythiol compound can be reduced through reaction with the specific reducing agent; the method is simple.

Description

technical field [0001] The invention belongs to the technical field of optical resins, and in particular relates to a method for reducing the chromaticity of polythiol compounds used in optical resins. Background technique [0002] Compared with inorganic glass, optical resin has obvious advantages in the application of glasses: light weight, good impact resistance and easy processing and molding. At present, the optical resin materials on the market are mainly polythiourethane resins prepared from polythiol compounds and isocyanates. The refractive index of this type of resin is significantly higher than other types of resins on the market. The higher the refractive index of the resin, the lighter and thinner the resulting lens. Therefore, this type of resin is the key development direction of optical resins in recent years. [0003] Yellowness index is an important indicator of optical resins, and the key factor determining the yellowness index is the chromaticity of po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/28C07C321/14C08G18/38
CPCC07C319/28C08G18/3876C07C321/14
Inventor 曹斌张超梁万根张宁马瑞宝魏政王越先
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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