High-Solid Anticorrosive Coating Composition Using Bisphenol Epoxy Resin
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Solution Overview
Problem
Conventional anticorrosive coating compositions for high solid types face challenges in achieving excellent drying properties, oil resistance, solvent resistance, chemical resistance, and anticorrosive properties while maintaining a low volatile organic component content, particularly in applications like ship tanks.
Innovation Solution
A high solid type anticorrosive coating composition comprising a semi-solid bisphenol type epoxy resin with an epoxy equivalent weight of 250 to 300, combined with an epoxy adduct of xylylenediamine and polyamide, along with a silane coupling agent and extender or coloring pigments, to achieve enhanced crosslinking density and adhesion, thereby improving oil resistance, solvent resistance, chemical resistance, and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively high molecular weight resin is used to achieve excellent oil resistance, solvent resistance, and chemical resistance, then the coating film provides superior resistance properties, but a large amount of solvent is required for coating workability, making it difficult to achieve high solid type
Solution Approach 1:
The invention changes the molecular weight parameter of the resin from high molecular weight to medium molecular weight (epoxy equivalent weight 250-300), and adjusts the curing agent ratio to achieve high solid type formulation. This parameter change allows the coating to maintain resistance properties while reducing solvent content to 50 wt% or less.
Solution Approach 2:
The invention uses a composite curing system combining epoxy adduct of xylylenediamine and epoxy adduct of polyamide in specific ratios (50-200 parts by weight of polyamide adduct per 100 parts by weight of xylylenediamine adduct). This composite curing system enables the medium molecular weight resin to achieve both high solid type formulation and excellent resistance properties.
2Quantity of substance
If the amount of solvent is reduced to make the coating high solid type, then the volatile organic component content is reduced, but the oil resistance, solvent resistance, and chemical resistance of the coating film become inferior
Solution Approach 1:
The invention optimizes the epoxy equivalent weight parameter to 250-300 (medium molecular weight range) and controls the curing agent ratio within specific ranges, enabling the coating film to achieve excellent resistance properties with reduced solvent content of 50 wt% or less.
Solution Approach 2:
The invention discards the conventional approach of using high molecular weight resins that require high solvent content, and recovers performance by using medium molecular weight resins with optimized curing systems that achieve both high solid type formulation and superior resistance properties.
3Quantity of substance
If an epoxy adduct of amine compound with reduced ratio is used to make high solid type, then the solvent content is reduced, but the drying properties of the coating become inferior
Solution Approach 1:
The invention uses a composite curing system combining epoxy adduct of xylylenediamine and epoxy adduct of polyamide in specific ratios. This composite system provides both high solid type formulation (50 wt% or less solvent) and excellent drying properties, resolving the contradiction between reduced solvent content and drying rate.
Solution Approach 2:
The invention optimizes the ratio parameter of the curing agents within specific ranges (50-200 parts by weight of polyamide adduct per 100 parts by weight of xylylenediamine adduct), enabling the coating to achieve both high solid type formulation and excellent drying properties.
4Speed
If a low molecular weight amine is used to improve drying rate, then the drying properties improve, but the oil resistance, solvent resistance, and chemical resistance decrease
Solution Approach 1:
The invention uses a composite curing system combining epoxy adduct of xylylenediamine and epoxy adduct of polyamide, which provides both fast drying rate and excellent resistance properties. This composite approach resolves the contradiction between drying speed and resistance properties that cannot be achieved with single curing agents.
Solution Approach 2:
The invention changes the curing agent type from low molecular weight amine to epoxy adducts of polyfunctional amines with controlled molecular weights and specific equivalent weights, optimizing both drying rate and resistance properties simultaneously.
5Quantity of substance
If modified polyamine such as cardanol is used to make high solid type, then the formulation achieves high solid type, but the oil resistance, solvent resistance, and chemical resistance are inferior to modified amine epoxy compounds
Solution Approach 1:
The invention uses a composite system of epoxy resin and dual curing agents (epoxy adduct of xylylenediamine and epoxy adduct of polyamide) that outperforms single modified polyamine systems in providing both high solid type formulation and superior resistance properties.
Solution Approach 2:
The invention changes from using modified polyamines to using epoxy adducts of polyfunctional amines with specific equivalent weights and molecular weights, achieving both high solid type formulation and superior resistance 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 composition forms a coating film with excellent drying properties, oil resistance, solvent resistance, chemical resistance, and anticorrosive properties while limiting volatile organic components, making it suitable for applications on ship tanks and other surfaces requiring high performance.
Implementation Method 1
a high solid type anticorrosive coating composition comprising (A) a main component containing a semi-solid state bisphenol type epoxy resin having epoxy equivalent weight of 250 to 300 (a1), (B) a curing component containing an epoxy adduct of xylylenediamine (b1) and an epoxy adduct of polyamide (b2)
Data Source
AI summary
A high solid type paint composition comprising (A) a main component containing a semi-solid state bisphenol type epoxy resin (a1) wherein the epoxy equivalent weight of the epoxy resin is 250 to 300, and (B) a curing component containing an epoxy adduct of xylylenediamine (b1) and an epoxy adduct of polyamide (b2), wherein the epoxy adduct of polyamide (b2) is contained at 50 to 200 parts by weight per 100 parts by weight of the epoxy adduct of xyleylenediamine (b1 ). The anticorrosive coating composition is excellent in drying properties during coating, and capable of forming a coating film having excellent oil resistance, solvent resistance, chemical resistance and anticorrosive properties.