Polymer Composition for Low-Temperature Curing Powder Coatings
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Solution Overview
Problem
There is a long-standing challenge in formulating one-component (1K) heat-curable powder coatings for a matt finish that offer excellent chemical resistance, reverse impact resistance, low gloss, and good physical storage stability, particularly when cured at temperatures lower than 225°C, as existing solutions often result in premature curing, poor storage stability, and inconsistent batch quality.
Innovation Solution
A specific polymer is developed that can be cured at 200°C, providing a unique combination of excellent chemical resistance, reverse impact resistance, low gloss, and good physical storage stability in its corresponding 1K powder coating compositions, overcoming issues of premature curing and batch inconsistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If existing 1K heat-curable powder coating compositions are formulated for matt finish and cured at temperatures below 225°C, then energy consumption is reduced and curing speed is improved, but chemical resistance deteriorates and storage stability worsens due to premature curing
Solution Approach 1:
The patent modifies the chemical parameters of the polyester polymer by controlling the molar ratio of specific structural units (S1, S2, S3, S4) and adjusting the acid value and hydroxyl value within precise ranges. These parameter changes enable the polymer to cure at lower temperatures (below 225°C) while maintaining chemical resistance and preventing premature curing during storage.
Solution Approach 2:
The patent creates a composite polymer structure combining multiple specific units (S1 with carboxyl groups, S2 with hydroxyl groups, S3 cyclic ester units, and S4 unsaturated acyclic hydrocarbyl units) in controlled proportions. This composite structure provides both the reactivity needed for low-temperature curing and the stability required for storage, resolving the contradiction between energy efficiency and material performance.
2Illumination intensity
If existing 1K heat-curable powder coating compositions are formulated for matt finish, then gloss is reduced, but reverse impact resistance deteriorates and batch consistency worsens
Solution Approach 1:
The patent optimizes the acid value (14-500 mg KOH/g) and hydroxyl value (14-300 mg KOH/g) parameters along with the molecular weight (10,000-50,000 g/mol) to achieve a balance between matt finish and mechanical strength. The specific ratio of structural units (S1: 10-50 mol%, S2: 10-50 mol%, S3: 5-30 mol%, S4: 5-30 mol%) is controlled to provide both low gloss and high reverse impact resistance.
3Speed
If existing 1K heat-curable powder coating compositions are formulated for low curing temperature, then curing speed is improved, but storage stability deteriorates due to premature curing
Solution Approach 1:
The patent carefully adjusts the functional group concentrations by controlling the acid value and hydroxyl value within specific ranges, and by optimizing the molar ratios of reactive units (S1, S2, S3, S4). This parameter optimization enables the polymer to maintain stability during storage while achieving rapid curing at low temperatures, preventing premature curing.
Solution Approach 2:
The patent incorporates cyclic ester units (S3) and unsaturated acyclic hydrocarbyl units (S4) into the polymer structure in advance, which act as latent reactive groups that remain stable during storage but become activated during curing. This preliminary incorporation of reactive groups enables fast low-temperature curing without compromising storage stability.
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 polymer enables 1K heat-curable powder coatings to achieve superior chemical and impact resistance with a matt finish while maintaining excellent storage stability, simplifying the coating process and reducing costs, and energy consumption.
Implementation Method 1
A specific polymer is developed that can be cured at 200°C, providing a unique combination of excellent chemical resistance, reverse impact resistance, low gloss, and good physical storage stability
Data Source
AI summary
The invention relates to a polymer comprising certain specific units. The invention further relates to processes for making the polymer of the invention. The invention further relates to a binder and compositions comprising the polymer, preferably to compositions suitable for paints and coatings. The invention relates in particular to water-borne, solvent-borne and powder coating compositions and preferably to curable water-borne, curable solvent-borne and curable powder coating compositions. The invention further relates to cured compositions. The invention further relates to objects, in particular coatings prepared from the compositions of the invention. The invention further relates to processes for making the compositions of the invention. The invention further relates to articles having coated thereon the compositions of the invention. The invention further relates to articles having coated and cured thereon the compositions of the invention. The invention further relates to various uses of the polymer of the invention, the binder of the invention, the composition of the invention, the cured composition of the invention and various uses of articles having coated and optionally cured thereon the compositions of the invention.