Single-Liquid Clear Paint Composition for 3C1B Systems
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Solution Overview
Problem
Existing multi-layer paint film formation methods, such as the 3C1B system, fail to achieve good paint film appearance and storage stability, especially with high temperature conditions, due to limitations in clear paint compositions using hydroxyl group-containing polyester resins and crosslinking agents.
Innovation Solution
A single-liquid type clear paint composition comprising a hydroxyl group-containing polyester resin with specific molecular weight and acid value ranges, combined with a crosslinking agent that reacts with hydroxyl groups, is used to form multi-layer paint films, optimizing the 3C1B system for improved paint film appearance, water resistance, and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clear paint compositions using polyester resins are used to achieve water resistance and chemical attack resistance, then resistance to chemical attack and water resistance are improved, but paint film appearance deteriorates
Solution Approach 1:
The patent uses a composite binder system combining polyester resin with acrylic resin or vinyl resin. The polyester resin provides water and chemical resistance, while the acrylic/vinyl resin component improves paint film appearance. This composite approach allows simultaneous achievement of both durability and aesthetic qualities that single-resin systems cannot provide alone.
2Reliability
If polyester resin with specified alicyclic part content is used to achieve weather resistance, then weather resistance is improved, but paint film appearance with 3C1B system deteriorates
Solution Approach 1:
The patent combines polyester resin containing alicyclic structures (which provide weather resistance) with acrylic or vinyl resin (which provide good paint film appearance). This composite binder system allows the alicyclic polyester to deliver UV and weather stability while the acrylic/vinyl component ensures acceptable appearance quality in the 3C1B multi-layer painting system.
Solution Approach 2:
The patent specifies particular parameter ranges for the polyester resin including alicyclic part content, hydroxyl value, and molecular weight to optimize the balance between weather resistance and paint film appearance. By controlling these parameters within specific ranges, the invention achieves both durability and aesthetic requirements.
3Reliability
If crosslinking agents reacting with hydroxyl groups are used to achieve chemical resistance, then resistance to chemical attack is improved, but storage stability under high temperature deteriorates
Solution Approach 1:
The patent carefully controls the hydroxyl value of the polyester resin within specific ranges (30-150 mg KOH/g) to optimize crosslinking density. By adjusting this parameter, the invention achieves sufficient chemical resistance through crosslinking while preventing excessive crosslinking that would cause storage instability under high temperature conditions.
Solution Approach 2:
The patent creates different functional zones within the paint film through controlled crosslinking. The crosslinked network provides chemical resistance where needed, while maintaining sufficient mobility in other regions to prevent storage instability. This localized functional differentiation resolves the contradiction between chemical durability and storage stability.
4Reliability
If hydroxyl group-containing polyester resin is used to achieve water resistance, then water resistance is improved, but paint film appearance with 3C1B system deteriorates
Solution Approach 1:
The patent combines hydroxyl group-containing polyester resin (providing water resistance) with acrylic or vinyl resin (providing good paint film appearance). The acrylic/vinyl component compensates for the appearance deficiencies of the polyester resin while the polyester resin maintains its water-resistant properties, achieving both requirements simultaneously.
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 solution provides clear paint films with excellent paint film appearance, high solid fraction on coating, and good storage stability, effectively addressing the limitations of previous methods by enhancing water resistance and weather resistance in the 3C1B system.
Implementation Method 1
a crosslinking agent (B) which reacts with hydroxyl groups
Implementation Method 2
a heating and curing process in which these three paint film layers are heated and cured at the same time
Data Source
AI summary
To provide a single-liquid type clear paint composition which has an excellent paint film appearance, and with which in particular which a good paint film appearance is obtained in the 3C1B system multi-layer paint film forming method, with which paint films which have excellent water resistance and weather resistance can be obtained, which has a high solid fraction on coating and which has good storage stability. [Means of Resolution] A single-liquid type paint composition which has as essential components a hydroxyl group-containing polyester resin (A) of which the weight average molecular weight is from 1,500 to 8,000, the acid value is from 0 to 50 mgKOH/g, the hydroxyl group value is from 100 to 180 mgKOH/g and the glass transition temperature is from -30 to 0°C and a crosslinking agent (B) which reacts with hydroxyl groups, wherein the aforementioned (A) component is a hydroxyl group- containing polyester resin which has been obtained by reacting a polybasic acid (a), a polyhydric alcohol (b) and at least one type of component (c) having at least six carbon atoms selected from among the saturated mono-carboxylic acids, saturated mono-alcohols, saturated glycidyl ethers and saturated glycidyl esters where the proportion by mass of the aforementioned (c) component is from 20 to 60 mass% with respect to the sum of the solid fraction masses of the aforementioned (a) to (c) components.