Method for preparing optical plastic of polythiocarbamic acid ether

A polythiocarbamate, ester optical technology, applied in optics, optical components, instruments, etc., can solve the problems of limited increase in the refractive index of benzene rings, large dispersion of resins containing benzene rings, etc., and achieve good homopolymerization and copolymerization performance. , the cohesive energy density is increased, and the transparency is good.

Inactive Publication Date: 2003-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the dispersion of resins containing benzene rings must become larger
In addition, the increase of the refractive i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053] Scheme 1 was adopted to synthesize 2,3-dimercaptoethylthiopropanethiol (BES):

[0054] Add 118.6g (0.5443 mole) 2,3-dibromopropanol (DBP) and 85g (1.0885 mole) mercaptoethanol (ME) successively in four-neck flask, N 2 Heated to 60°C in a protected water bath. Add 1.1974 moles of 20% NaOH solution dropwise within 1 hour, and control the temperature at about 60°C. When the NaOH solution was nearly added, the solution changed from lavender to colorless to light yellow. The above reaction mixture was directly added with 130.5 g (1.7145 moles) of thiourea (TU) and 150 mL (1.7962 moles) of 36% HCl without separation and purification. Reflux at 105°C for 6 hours, cool to below 70°C, pass N 2 , adding 78.2g (1.8778 moles) NaOH (purity 96%, prepared as a 20% solution for use) at one time. That is, a white precipitate is produced, and the temperature T≤70°C is maintained. Then slowly heat to 70°C and react for 0.5-1 hour. At this time, the white solid disappears, and the oil...

example 2

[0058] The TDI in Example 1 was replaced by diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI) or hexamethylene diisocyanate trimer (HDIT), respectively. Keep the SH / NCO molar ratio at 1.05, and keep other conditions unchanged. The optical plastic properties obtained after curing are listed in Table 1.

example 3

[0060] Using the BES and hexamethylene diisocyanate trimer (HDIT) synthesized in Example 1, by changing the SH / NCO molar ratio and keeping other conditions unchanged, optical plastics with different properties were obtained after curing. The effect of SH / NCO molar ratio on the properties of polythiourethane optical plastics obtained by BES / HDIT polymerization is listed in Table 2.

[0061] SH /

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PUM

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Abstract

A preparation method of a polyamine phthalate optical plastic is disclosed in this invention. Its character lies in compounding the thiol including and several hydroxyls, and affluxing home-made admixture composed of thiol and cyanate into the mould, and getting good diaphaneity, high refraction exponent and high concussioness intension polyamine phthalate optical plastic. The method has simple compounding craftwork, high monocase purity, outstanding outcome synthesis performance, low cost, good controlling and repetition capability of response procedure, gentle response condition etc. merits. The phthalate optical plastic can be applied in many fields, applies madding various clarity parts of an apparatus and especially the apparatus requiring high refraction exponent such as prism, lens and over thin pitch eyeclass and so on.

Description

technical field [0001] The invention relates to a method for preparing optical plastics, in particular to a method for preparing polythiourethane optical plastics by in-situ polymerization of polythiol and polyisocyanate compounds in a mold. Background technique [0002] Polymer optical resin (optical plastic) has been widely used in industry, agriculture, communication, aerospace and daily life in recent years due to its good impact resistance, low density, low price, and easy processing and molding. Such as plastic optical fiber, windshield on aircraft, glasses, telescope, magnifying glass, lens on camera and other industrial and civil facilities. So far, polystyrene (PS), polycarbonate (PC), polymethyl methacrylate (PMMA), polydiallyl diglycol carbonate (CR-39) still occupy the leading positions as traditional optical plastics. Dominance of Optical Plastics Market. However, with the continuous development of modern economy and high-tech, differ...

Claims

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Application Information

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IPC IPC(8): C08G18/38C08G18/72G02B1/04
Inventor 高长有沈家骢张安震
Owner ZHEJIANG UNIV
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