Optical Resin Composition Impact Resistance Multi-Coating
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Solution Overview
Problem
Existing plastic optical lenses face issues with impact resistance deterioration after multi-coating, high viscosity leading to injection time problems, and heat resistance issues, which result in defects and breakage during impact tests.
Innovation Solution
A plastic optical resin composition comprising 30-60% isophorone diisocyanate and hexamethylene diisocyanate, 40-70% pentaerythritol tetrakis(3-mercaptopropionate), 0.005-6% UV absorber, and 0.01-5% polymerization initiator, thermally cured and subjected to hard-coating and multi-coating to maintain impact resistance and improve optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multi-coating (anti-reflective coating) is applied to plastic optical lenses, then optical properties are improved, but impact resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin, specifically using a mixture of isophorone diisocyanate and hexamethylene diisocyanate with pentaerythritol tetrakis(3-mercaptopropionate) to create a balanced polymer network that maintains both optical clarity for coating and impact resistance
Solution Approach 2:
The patent creates a composite resin system combining multiple components (diisocyanate mixture, pentaerythritol tetrakis(3-mercaptopropionate), UV absorber, release agent, and polymerization initiator) that work synergistically to provide both coating compatibility and impact resistance
2Ease of manufacture
If high viscosity resin composition is used, then moldability is improved, but injection time increases
Solution Approach 1:
The patent optimizes the viscosity parameter by selecting specific component ratios and molecular weights, achieving a balance where the resin is viscous enough for complete mold filling and defect-free curing, yet fluid enough for acceptable injection timing
3Strength
If heat resistance is increased to prevent breakage, then durability is improved, but defect ratio increases due to cracking
Solution Approach 1:
The patent adjusts the crosslinking density and polymer network structure by modifying the diisocyanate to polyol ratio and selecting specific molecular weights, achieving optimal heat resistance that prevents breakage without creating excessive internal stress that would cause cracking defects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves superior impact resistance, light-weight, moldability, and transparency, with the optical lens maintaining performance even after coatings, addressing previous issues of breakage and defect ratios.
Implementation Method 1
0.01 to 5% by weight of a polymerization initiator
Implementation Method 2
0.005 to 6% by weight of a UV absorber
Implementation Method 3
the optical lens with superior impact resistance as well as good optical properties is obtained by thermally curing the plastic optical resin composition
Data Source
AI summary
An optical resin composition with superior impact resistance and a method for producing an optical lens from the composition are disclosed. In one embodiment, the optical resin composition for a plastic optical lens has superior impact resistance as well as light-weight, superior moldability, excellent dyeing ability, a high Abbe number and good transparency. The optical lens produced from the composition exhibits superior impact resistance even after multi-coating. The optical resin composition with superior impact resistance has a solid refractive index (nD) of about 1.53 to about 1.57, an Abbe number of about 35 to about 48, a liquid specific gravity of about 0.97 to about 1.25 and a solid specific gravity of about 1.10 to about 1.35, by which the composition comprises a mixture of isophorone diisocyanate and hexamethylene diisocyanate, pentaerythritol tetrakis(3-mercaptopropionate), a UV absorber, a release agent and a polymerization initiator. The optical lens is produced by thermally curing the composition.