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Method for preparing stable bisphenol sodium salt solution

A bisphenol sodium salt, stable technology, applied in the field of preparation of bisphenol sodium salt solution, can solve the problems of complex operation and high temperature, and achieve the effects of fast dissolution speed, extended life and good contact

Inactive Publication Date: 2010-06-16
CHINA NAT BLUESTAR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although the existing technology has good effects in reducing the amount of phosgene and reducing the hydrolysis of phosgene, etc., the equipment requirements are relatively strict, and the operation is complicated, and the temperature is high. The problem of oxidation is more obvious

Method used

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  • Method for preparing stable bisphenol sodium salt solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 1.2g NaOH, 0.017gNa 2 S 2 o 4 and 0.01g Na 2 SO 3 , stirring and dissolving under the protection of nitrogen, then adding 2.7g of bisphenol A under continuous stirring, and dissolving at 30°C for 15 minutes to form a transparent bisphenol A sodium salt solution. Then, the ultraviolet absorbance of the bisphenol A sodium salt solution at 370 nm was measured by an ultraviolet photometer. Because if bisphenol A is oxidized to quinones, it will have a characteristic UV absorption at 370 nm. The larger the absorption value, the greater the degree of oxidation.

Embodiment 2

[0049] Add 1.2g NaOH, 0.017gNa 2 S 2 o 4 and 0.01g Na 2 SO 3 , stirring and dissolving under the protection of nitrogen, and then adding 2.7g of bisphenol A under continuous stirring, and dissolving at 80°C for 15 minutes to form a transparent bisphenol A sodium salt solution. Then, the ultraviolet absorbance of the bisphenol A sodium salt solution at 370 nm was measured by an ultraviolet photometer. Because if bisphenol A is oxidized to quinones, it will have characteristic ultraviolet absorption at 370nm, and the greater the absorption value, the greater the degree of oxidation.

Embodiment 3

[0059] Add 1.2gNaOH, 5mgNaOH to 12ml deionized water containing 1% (volume ratio) dichloromethane 2 S 2 o 4 and 0.4 mg Na 2 SO 3 , stirring and dissolving under the protection of nitrogen, then adding 2.3g of bisphenol A under continuous stirring, and dissolving at 30°C for 15 minutes to form a transparent bisphenol A sodium salt solution.

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PUM

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Abstract

The invention provides a method for preparing a stable bisphenol sodium salt solution. The method comprises the following steps of: adding the deionized water of an inertia organic solvent or the technical backwater containing dichloromethane, preparing the mixture and the solid sodium hydroxide into alkaline liquor, adding compound antioxidant into the alkaline liquor while stirring under a condition free from oxygen, adding bisphenol into the mixture, stirring and dissolving so as to form the stable bisphenol sodium salt solution. The method of the invention has the advantages of simple operation, mild condition and small oxidation damage and is applied to producing intermittence and continuous makrolon. The stable bisphenol sodium salt solution prepared with the method of the inventionhas high thermal endurance, excellent colour and luster and the color of the makrolon is not damaged.

Description

technical field [0001] The invention relates to a polycarbonate process synthesized by interfacial condensation polymerization, in particular to a preparation method of bisphenol sodium salt solution. Background technique [0002] Polycarbonate is one of the five general-purpose engineering plastics. It is the fastest-growing transparent organic material in recent years. It has the characteristics of high mechanical strength and good transparency. The preparation of polycarbonate can generally be divided into phosgene method and non-phosgene method. At present, the most widely used in industrial production in the world is the phosgene interfacial polycondensation method. [0003] Known according to disclosed technology, phosgene interfacial method prepares polycarbonate generally all is to carry out by following process: dihydroxy diaryl alkane (bisphenol) reacts with phosgene in the heterogeneous medium with the form of its alkali metal salt Among them, the heterogeneous m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/235C07C37/66C07C37/88C08G64/24
Inventor 朱栋栋张希文鲁代仁张丹丹胡衍平李瑞亢
Owner CHINA NAT BLUESTAR GRP CO LTD
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