Benzoxazine Mixture Low-Temperature Curing Metal Complex Catalyst
Solution Overview
Problem
Conventional thermosetting resins like phenol and melamine resins generate volatile by-products during curing, while epoxy and unsaturated polyester resins have poor flame retardancy and high costs, and polybenzoxazines require high temperatures or slow curing, which can lead to undesired weight loss and reduced thermal stability.
Innovation Solution
A benzoxazine-based mixture is created by reacting hydroxyalkylphenol with a phenol-based compound and glyoxal, then mixed with a mono amine-based compound and an aldehyde-based compound, allowing for rapid curing at low temperatures without volatile by-products, maintaining high thermal stability and low dielectric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional curing agents (phenol, amine, phosphine) are used to lower curing temperature of polybenzoxazine, then curing temperature is reduced, but partial polymerization occurs at low temperatures and thermal stability deteriorates
Solution Approach 1:
The patent introduces a specific curing agent comprising a metal complex of formula (1) as an intermediary substance that mediates the curing reaction. This metal complex enables low-temperature curing while maintaining thermal stability by facilitating the ring-opening polymerization of oxazine rings without causing partial polymerization or degradation, thus resolving the contradiction between lowering curing temperature and maintaining thermal stability.
Solution Approach 2:
The patent changes the chemical parameters of the curing agent by using a specifically designed metal complex with controlled ligand structure and metal center. This parameter change allows the curing reaction to proceed at lower temperatures while maintaining the thermal stability of the cured product, as the metal complex provides a controlled catalytic pathway that avoids the side reactions associated with conventional curing agents.
2Productivity
If highly reactive curing agents are used to accelerate curing reaction, then curing speed increases, but undesired weight loss occurs during polymerization
Solution Approach 1:
The metal complex curing agent acts as a controlled intermediary that accelerates the curing reaction through catalysis while maintaining reaction control. This prevents the uncontrolled side reactions and degradation that cause weight loss, as the metal complex provides a specific catalytic mechanism that promotes the desired polymerization pathway while suppressing decomposition reactions.
Solution Approach 2:
The patent optimizes the chemical structure parameters of the curing agent to achieve the right balance between reactivity and stability. The metal complex structure is designed to provide sufficient catalytic activity for fast curing while maintaining thermal stability that prevents weight loss, thus resolving the contradiction between curing speed and substance retention.
3Duration of action of moving object
If polybenzoxazine is cured at high temperatures to achieve complete curing, then curing completeness improves, but thermal stability of the cured product deteriorates
Solution Approach 1:
The patent fundamentally changes the temperature parameter of the curing process by using a metal complex curing agent that enables complete curing at lower temperatures. This parameter change allows achieving full conversion of oxazine rings to polymer chains without subjecting the system to high temperatures that would degrade thermal stability, thus resolving the contradiction between curing completeness and thermal 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 benzoxazine-based mixture achieves excellent heat resistance, flame retardancy, and electrical characteristics, suitable for applications in copper clad laminates, printed circuit boards, and electronic components, while maintaining physical properties.
Implementation Method 1
In the case of thermosetting resins with benzoxazine ring in molecular structure, the oxazine ring is opened by heating and the polymerization proceeds without the formation of by-products.
Implementation Method 2
WO2008/034814 A2 discloses several modified acetylacetonate metal complexes as catalysts/curing agents for low temperature curing of benzoxazine-containing compositions.
Data Source
AI summary
The present invention relates to a benzoxazine-based mixture and a use thereof and, more specifically, to a benzoxazine-based mixture and a use of a cured product in which the benzoxazine-based mixture is cured, wherein the benzoxazine-based mixture has high dielectric characteristics, heat resistant characteristics, and flame-retardant characteristics by comprising a benzoxazine ring in a molecular structure, and thus can be applied to a sealing material, a molding material, a template material, an adhesive, a material for an electric insulation paint, and the like, which are used for a copper clad laminate or an electronic part, used in a printed circuit board.