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
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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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