Aqueous Coating Composition with Polyether Modified Polysiloxane
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Solution Overview
Problem
Existing aqueous two-component coating compositions for wooden substrates suffer from poor fullness, low application solid content, and transparency issues, often requiring multiple coats and leading to film sag and grain puffing problems.
Innovation Solution
A two-component aqueous coating composition comprising a primary agent with fatty acid-derived polyol and polyether modified polysiloxane, combined with an aqueous polyisocyanate curing agent, achieving high application solid content and transparency, and effectively preventing grain puffing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional two-component aqueous coating composition is used to achieve high fullness, then multiple coats (4-5 times) are required, but film sag occurs in the later stage
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating polyether modified polysiloxane (2-10 wt%) and high solid content fatty acid-derived polyol (90 wt% or higher) into the coating formulation. This chemical parameter change enables achieving high fullness in fewer coats while preventing film sag, resolving the contradiction between fullness and film stability
Solution Approach 2:
The patent creates a composite coating system combining polyether modified polysiloxane with fatty acid-derived polyol and aqueous polyisocyanate curing agent. This composite material approach synergistically improves both fullness and film stability, allowing high quality coating in fewer applications without film sag
2Ease of operation
If traditional aqueous two-component coating composition is applied on wooden substrates, then coating can be applied, but grain puffing issues occur
Solution Approach 1:
The polyether modified polysiloxane acts as an intermediary substance between the aqueous coating and the wooden substrate. It modifies the surface interaction properties, preventing the coating from causing grain puffing while maintaining ease of application on wooden substrates
Solution Approach 2:
The patent modifies the surface tension and wetting parameters of the coating by adding polyether modified polysiloxane. This parameter change allows the coating to interact properly with wooden substrates without causing grain puffing, resolving the contradiction between ease of application and substrate damage
3Quantity of substance
If existing aqueous two-component coating composition is used, then coating can be formed, but application solid content is low and transparency is poor
Solution Approach 1:
The patent changes the formulation parameters by using high solid content fatty acid-derived polyol (90 wt% or higher) and optimizing the polyether modified polysiloxane content (2-10 wt%). This parameter optimization achieves both high application solid content (70-90 wt%) and excellent transparency, resolving the contradiction between quantity and optical properties
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 composition achieves high fullness, transparency, and hardness, meeting national VOC standards with a solid content of 70-90% and reduced grain puffing, outperforming traditional compositions in terms of film quality and durability.
Implementation Method 1
a two-component aqueous coating composition, the coating composition comprising: a) at least one primary agent, the at least one primary agent comprising i) at least one fatty acid derived polyol; and ii) at least one polyether modified polysiloxane; and b) at least one aqueous polyisocyanate curing agent
Data Source
Figure 1
AI summary
The present disclosure relates to a two-component aqueous coating composition and a wooden article, the coating composition comprising: a) at least one primary agent, the at least one primary agent comprising i) at least one fatty acid derived polyol; ii) at least one polyether modified polysiloxane; and b) at least one aqueous polyisocyanate curing agent, wherein the at least one polyether modified polysiloxane is present in an amount of at least 2 wt% relative to the total weight of the at least one primary agent. The two-component aqueous coating composition of the present invention can be applied to a variety of applications, including sealing primers, transparent primers, topcoats, solid color paints, and the like.