TACT Coating Composition with Controlled DBC for Pinholes and Sagging
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Solution Overview
Problem
The formation of dibutyl carbonate (DBC) byproducts during the preparation of tris(alkoxycarbonylamino)triazine (TACT) coating compositions leads to issues such as pinholes and sagging on the coated surface, degrading the appearance of the coating.
Innovation Solution
Control the DBC content in the TACT composition between 2 to 11 wt% and adjust process parameters like the use of sodium methoxide or sodium tert-butoxide to manage DBC generation, and optionally add additional DBC to achieve the desired content range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If TACT coating composition is prepared using conventional methods, then the coating composition can be manufactured, but dibutyl carbonate (DBC) byproducts are formed causing pinholes and sagging on the coating surface
Solution Approach 1:
The patent applies parameter changes by controlling the DBC content within a specific range (2-11 wt%) to transform the harmful effect of DBC byproducts into a beneficial outcome. By adjusting the concentration parameter of DBC from an uncontrolled state to a controlled range, the coating surface appearance is significantly improved while eliminating pinholes and sagging, thus resolving the contradiction between ease of manufacture and harmful surface defects
Solution Approach 2:
The patent converts the harmful DBC byproduct into a beneficial element by deliberately controlling its presence within a specific concentration range (2-11 wt%). Instead of completely eliminating DBC which would be difficult and costly, the invention recognizes that a controlled amount of DBC does not cause surface defects and may even provide beneficial effects, thus transforming the harmful factor into a acceptable or even useful component in the final coating composition
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 controlled DBC content results in superior coating surface appearance with no pinholes or sagging, enhancing the aesthetic quality of the coated object.
Implementation Method 1
reacting a compound of formula (II) below with carbonate in the presence of an alcohol and a base; wherein... the base is alkali metal alkoxide or alkaline earth metal alkoxide. In one or more embodiments, the alkali metal alkoxide is sodium tert-butoxide or sodium methoxide.
Implementation Method 2
Tris(alkoxycarbonylamino)triazine (TACT) is a trifunctional melamine-based crosslinking agent having a reactive carbamate functional group, which can be used as a crosslinking agent for water-based coatings and solvent-based coatings.
Data Source
AI summary
The present invention provides a tris (alkoxycarbonylamino) triazine (TACT) composition, coating composition comprising the same, and manufacturing method thereof. The tris (alkoxycarbonylamino) triazine composition comprises TACT and dibutyl carbonate (DBC); wherein the DBC ranges from 2 to 11 wt % of total weight of the composition. Through the usage of the coating composition comprising the composition of the present invention, the coating film surface of the coated object can have excellent film surface appearance.