Urethane Alkyd Acrylic Latex Coating Hardness
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Solution Overview
Problem
Coating compositions for trim surfaces lack sufficient hardness and block resistance, leading to damage during installation and requiring frequent repainting, and existing coatings do not cure quickly enough to provide these desirable properties.
Innovation Solution
A coating composition comprising a mixture of waterborne urethane alkyd resin and crosslinking acrylic latex resin, with a mass ratio ranging from 5:95 to 95:5, which includes optional components like styrene-acrylic resin, diacetone acrylamide, adipic dihydrazide, and phosphate-containing comonomers, to achieve high pendulum hardness and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coating compositions are used, then the coating can be applied to trim surfaces, but the coating lacks sufficient hardness and block resistance, leading to damage during installation and frequent repainting
Solution Approach 1:
The patent combines waterborne urethane alkyd resin with crosslinking acrylic latex resin to create a composite coating formulation. This composite approach integrates the hardness-providing urethane alkyd with the crosslinking acrylic to achieve both high hardness and durability, directly resolving the contradiction between strength and reliability
Solution Approach 2:
The patent specifies precise mass ratio parameters (5:95 to 95:5) for the resin components and controls curing time parameters (18 hours to four weeks) to optimize the balance between hardness development and damage resistance. By adjusting these parameters, the coating achieves both high hardness and reliability simultaneously
2Reliability
If conventional coating compositions are used, then the coating can provide basic protection, but the curing time is extended beyond initial curing periods, delaying return to normal use
Solution Approach 1:
The patent optimizes the curing time parameter by formulating the coating to achieve high hardness and durability within 18 hours to four weeks. The crosslinking acrylic latex resin accelerates the curing process while maintaining durability, transforming the traditional long-curing requirement into a shortened curing period without sacrificing reliability
Solution Approach 2:
The coating formulation enables the curing process to progress rapidly through the initial curing period, achieving functional hardness and durability much faster than conventional coatings. This allows the coating to skip the extended curing time typically required for durable coatings, enabling quicker return to normal use
3Strength
If high hardness and scratch resistance are achieved, then the coating requires frequent repainting due to brittleness, but reducing hardness improves damage resistance
Solution Approach 1:
The composite of waterborne urethane alkyd resin and crosslinking acrylic latex resin creates a balanced coating system where the urethane alkyd provides scratch resistance while the crosslinking acrylic maintains flexibility and prevents brittleness. This composite structure allows the coating to achieve both high scratch resistance and long service life without frequent repainting
Solution Approach 2:
The patent controls the mass ratio parameters of the resin components to optimize the balance between scratch resistance and flexibility. By adjusting these parameters within the specified ranges, the coating achieves adequate scratch resistance while maintaining enough flexibility to prevent cracking and extend the time between repaintings
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 cures to form a coating with superior hardness and scratch resistance within initial curing periods of 18 hours to four weeks, providing a durable finish that reduces damage and repainting frequency.
Implementation Method 1
a crosslinking acrylic latex resin
Data Source
AI summary
Disclosed is a coating composition that generally includes a waterborne alkyd resin including urethane groups and a crosslinking acrylic latex resin. An alkyd resin and an acrylic latex resin can be included in a composition in relative amounts to yield a cured coating that has a higher pendulum hardness than that of a coating formed from an otherwise identical composition that excludes the acrylic latex resin. The composition can be formulated such that solids of said waterborne urethane alkyd resin and solids of said crosslinking acrylic latex resin are present in a mass ratio ranging from 20:80 to 80:20 with respect to one another A method of preparing a coating composition generally includes blending relative amounts of an alkyd resin and an acrylic latex resin.