2K Coating Composition for Light-Transmitting Plastic Parts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coatings for light-emitting parts of new energy vehicles, such as light-emitting grilles and decorative strips, lack the necessary hiding power, weather resistance, solvent resistance, and mechanical performance, particularly on transparent or translucent plastic substrates, and do not meet the requirements for light transmission and color effects.
Innovation Solution
A 2K coating composition comprising a first component with hydroxyl acrylic resin and organic solvent, and a second component with an isocyanate curing agent, which forms a coating system suitable for transparent or translucent plastic substrates, providing excellent hiding power, weather resistance, solvent resistance, and mechanical properties, along with adjustable light transmittance and color effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional coatings are applied on transparent or translucent plastic substrates, then light transmission effect is achieved, but hiding power and weather resistance are insufficient
Solution Approach 1:
The coating system is divided into multiple components: a first component containing hydroxyl acrylic resin with specific molecular weight range (10,000-30,000) and a second component containing isocyanate curing agent. This segmentation allows each component to contribute specific properties - the resin provides light transmission and adhesion, while the curing agent forms crosslinked structures for enhanced hiding power and weather resistance.
Solution Approach 2:
The patent specifies precise parameter ranges for the hydroxyl acrylic resin, including number average molecular weight (10,000-30,000) and hydroxyl value (15-50 mg KOH/g). These parameter optimizations balance the competing requirements: lower molecular weight improves adhesion and drying speed, while higher molecular weight enhances hiding power and durability.
2Reliability
If coatings with strong hiding power are used on transparent substrates, then opacity is improved, but light transmittance and transparency effects are reduced
Solution Approach 1:
The patent optimizes the number average molecular weight of hydroxyl acrylic resin to 10,000-30,000 and hydroxyl value to 15-50 mg KOH/g. This parameter control creates a balance where the coating achieves sufficient hiding power through optimized film formation and crosslinking, while maintaining appropriate light transmittance through controlled refractive index and film thickness.
Solution Approach 2:
The coating system combines hydroxyl acrylic resin with isocyanate curing agent to form a crosslinked composite coating structure. This composite material achieves synergistic effects: the resin matrix provides light transmission properties, while the crosslinked network enhances hiding power, weather resistance, and mechanical strength.
3Reliability
If coatings with high crosslinking density are used to improve weather resistance, then durability is improved, but adhesion and flexibility are reduced
Solution Approach 1:
The patent controls the hydroxyl value of acrylic resin within 15-50 mg KOH/g and number average molecular weight at 10,000-30,000. These parameter optimizations ensure adequate hydroxyl groups for crosslinking (providing weather resistance) while maintaining sufficient molecular weight and chain flexibility (providing adhesion and flexibility).
Solution Approach 2:
The combination of hydroxyl acrylic resin and isocyanate curing agent creates a crosslinked composite coating where the crosslinking density is controlled by the hydroxyl value. This composite structure provides weather resistance through crosslinking while maintaining adhesion and flexibility through the acrylic resin matrix with optimized molecular weight and hydroxyl content.
4Productivity
If fast-drying coatings are used to improve productivity, then drying speed is improved, but adhesion and mechanical properties are reduced
Solution Approach 1:
The patent optimizes the number average molecular weight of hydroxyl acrylic resin to 10,000-30,000 and hydroxyl value to 15-50 mg KOH/g. Lower molecular weight and controlled hydroxyl value enable faster evaporation of solvents and quicker formation of the coating film, improving drying speed while maintaining adequate adhesion and mechanical properties through the crosslinking reaction.
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 coating system achieves high adhesion, quick-drying, and durable coatings with desired opacity, transparency, or translucency, meeting the aesthetic and functional needs of light-emitting vehicle parts while maintaining mechanical integrity.
Implementation Method 1
a 2K coating composition comprising a first component and a second component, wherein the first component comprises a hydroxyl acrylic resin and an organic solvent, and the second component comprises an isocyanate curing agent
Data Source
AI summary
Disclosed is a two-component (2K) coating composition comprising a first component and a second component, wherein the first component comprises a hydroxyl acrylic resin and an organic solvent. and the second component comprises an isocyanate curing agent, wherein the hydroxyl acrylic resin has a number average molecular weight of 10,000 to 30,000, the hydroxyl acrylic resin comprises an acrylic resin with a low hydroxyl value and an acrylic resin with a medium hydroxyl value, the acrylic resin with a low hydroxyl value has a hydroxyl value of less than 30 mg KOH/g, the acrylic resin with a medium hydroxyl value has a hydroxyl value of 30 to 70 mg KOH/g. Also disclosed is a coated substrate comprising a substrate and the 2K coating composition coated onto at least a part of the substrate. Further disclosed is a coating system comprising a first coating composition and a second coating composition, wherein the first coating composition and/or the second coating composition are the 2K coating composition. The present invention further provides a unit and a plurality of methods for treating the unit.