Method for improving refractive index and heat resistance of polyurethane resin optical material

A polyurethane resin and optical material technology, applied in optics, optical components, instruments, etc., can solve the problems of impact toughness, glass transition temperature, anti-yellowing performance reduction, resin refractive index and huge workload, etc., to achieve Improves heat resistance, avoids troublesome problems, and reduces the effect of burning smoke

Active Publication Date: 2016-02-03
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, manufacturers often adjust the resin refractive index by adjusting the ratio of monomers. Directly adjusting the ratio of monomers often causes various changes in the performance of resin lenses, which in turn causes more problems, especially impact toughness. The most obvious reduction in glass transition temperature and anti-yellowing performance
For manufacturers specializing in the production of polyurethane resin prepolymers, they will face the problem of different molds of downstream lens manufacturers. Prepolymer manufacturers have a huge workload to adjust the resin refractive index to match the molds of various lens manufacturers.
[0004] When the refractive index of the resin prepolymer is far from the fixed refractive index of the mold, it is not advisable to adjust the monomer ratio, because the range of adjusting the refractive index by the monomer ratio is very limited, and the replacement of the monomer should take into account the following properties: The yellowing performance is good, the refractive index is higher, the cost does not increase, the molecule has a certain rigid group, etc. At the same time, it is a long process to replace the monomer, and a lot of basic performance research is required to ensure that the performance is qualified, and the workload is huge. This method is very difficult to implement in the manufacturer

Method used

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  • Method for improving refractive index and heat resistance of polyurethane resin optical material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Isocyanate trimer preparation: Weigh isophorone diisocyanate (20g), add dibutyltin dichloride (0.02g), react at a constant temperature at 60°C for 5h, and test the conversion rate of isophorone diisocyanate trimer It is 71.1%, and the refractive index is 1.5323.

[0056] Polyurethane prepolymer preparation: take the above isophorone diisocyanate trimer (12.0g), and 1,6-diisocyanatohexane (13.4g), dicyclohexylmethane 4,4-diisocyanate (25.0g ), then add pentaerythritol tetrakis(3-mercaptopropionate) (4.8g), 2,3-bis(2-mercaptoethylthio)-3-propane-1-thiol (41.8g), UV-324 (0.4g), UV-327 (0.6g), antioxidant 1010 (0.5g), light stabilizer 770 (0.2g), di-n-butyl phosphate (0.8g), di-n-butyltin dilaurate (1.0g) and purple agent 511 (0.2ppm) were mixed and dissolved to make a uniform solution.

[0057] Its specific curing steps are:

[0058] (1) Take 10 mg of polyurethane optical resin pre-polymerization liquid sample and seal it in a special crucible for differential scanning ...

Embodiment 2

[0072]Preparation of isocyanate trimer: Weigh isophorone diisocyanate (20g), add N,N',N"-tris(dimethylaminopropyl)-hexahydrotriazine (0.05g), at 70°C After constant temperature reaction for 5 hours, it was tested that the conversion rate of isophorone diisocyanate trimer was 72.6%, and the refractive index was 1.5346.

[0073] Polyurethane prepolymer preparation: take the above isophorone diisocyanate trimer (12.0g), and 1,6-diisocyanatohexane (13.4g), dicyclohexylmethane 4,4-diisocyanate (25.0g ), then add pentaerythritol tetrakis(3-mercaptopropionate) (4.8g), 2,3-bis(2-mercaptoethylthio)-3-propane-1-thiol (41.8g), UV-324 (0.4g), UV-327 (0.6g), antioxidant 1010 (0.5g), light stabilizer 770 (0.2g), di-n-butyl phosphate (0.8g), di-n-butyltin dilaurate (1.0g) and purple agent 511 (0.2ppm) were mixed and dissolved to make a uniform solution.

[0074] Its specific curing steps are:

[0075] (1) Take 10 mg of polyurethane optical resin pre-polymerization liquid sample and seal i...

Embodiment 3

[0089] Preparation of isocyanate trimer: Weigh isophorone diisocyanate (20g), add 2,4,6-tris(dimethylaminomethyl)phenol (0.06g), react at constant temperature at 80°C for 5h, test the isophorone Fluorone diisocyanate trimer conversion rate is 73.2%, and the refractive index is 1.5355.

[0090] Polyurethane prepolymer preparation: take the above isophorone diisocyanate trimer (12.0g), and 1,6-diisocyanatohexane (13.4g), dicyclohexylmethane 4,4-diisocyanate (25.0g ), then add pentaerythritol tetrakis(3-mercaptopropionate) (4.8g), 2,3-bis(2-mercaptoethylthio)-3-propane-1-thiol (41.8g), UV-324 (0.4g), UV-327 (0.6g), antioxidant 1010 (0.5g), light stabilizer 770 (0.2g), di-n-butyl phosphate (0.8g), di-n-butyltin dilaurate (1.0g) and purple agent 511 (0.2ppm) were mixed and dissolved to make a uniform solution.

[0091] Its specific curing steps are:

[0092] (1) Take 10 mg of polyurethane optical resin pre-polymerization liquid sample and seal it in a special crucible for differ...

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Abstract

The application provides a method for improving the refractive index and heat resistance of a polyurethane resin optical material. Mainly, isocyanate is subjected to trimerization to obtain an isocyanate tripolymer with good yellowing resistance, higher refractive index, unchanged cost and higher molecular structure rigidity, then a curing process is improved, by accurately determining Tc, Tp and Te three key temperature points, a temperature rising gradient is accurately determined, and the problem of poor mechanism property or poor heat resistance generated due to an improper curing temperature rising process of the resin is avoided. By adopting the method, the refractive index, mechanical property, heat resistance and other performances of the finally obtained resin all achieve the best.

Description

technical field [0001] The invention belongs to the technical field of optical resins, in particular to a method for improving the refractive index and heat resistance of polyurethane resin optical materials. Background technique [0002] Polyurethane high refractive resin is polymerized from isocyanate and polythiol. At present, the resin lenses sold in the market mainly include four categories: MR-8, MR-7, MR-10, and MR-174, and their refractive index ranges from 1.60 to 1.74. The resin material has high light transmittance and high refractive index, and the lenses made of it are thinner and lighter; it breaks the convention of high refractive index and low Abbe number, making the image clearer; the perfect combination of polythiol and isocyanate In terms of mechanical properties, it has higher impact strength without losing toughness, wear resistance and strong machinability. It is especially suitable for the production of the most popular diamond cut glasses. Its superi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/02C08G18/38C08G18/75C08G18/79G02B1/04
CPCC08G18/022C08G18/3876C08G18/722C08G18/758C08G18/792C08G2115/02G02B1/041
Inventor 曹飞羽马韵升姚刚刘振学柳金章刘英贤张云奎张晶
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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