Thiol-Modified Benzoxazine Composition for Low-Temperature Curing
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Solution Overview
Problem
Existing benzoxazine compounds require high curing temperatures, leading to inefficiencies in heating and cooling times, energy consumption, and material thermal degradation during polymerization and mixing with other thermosetting resin monomers or additives.
Innovation Solution
A novel benzoxazine compound with benzoxazine rings at both ends of a linking group and a thiol group, allowing for low-temperature curing, is developed using a bisphenol compound as a raw material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional benzoxazine compounds are used, then high heat resistance and mechanical properties are achieved, but high curing temperatures are required leading to energy consumption and material thermal degradation
Solution Approach 1:
The invention modifies the chemical structure of benzoxazine compounds by introducing thiol groups at terminal positions, which fundamentally changes the curing characteristics. This structural parameter change enables the compound to cure at lower temperatures (reducing curing temperature by 50-100°C compared to conventional compounds) while maintaining the desired heat resistance and mechanical properties in the cured product
2Productivity
If conventional benzoxazine compounds are used, then high heat resistance is achieved, but long heating and cooling times are required reducing manufacturing efficiency
Solution Approach 1:
By changing the chemical structure to include thiol groups, the curing reaction proceeds at lower temperatures and faster rates. This parameter change in reaction kinetics significantly reduces both heating time and cooling time required for the molding process, thereby improving overall manufacturing efficiency and productivity
3Reliability
If high curing temperatures are used, then complete polymerization is achieved, but material thermal degradation occurs
Solution Approach 1:
The thiol group introduction changes the polymerization mechanism to proceed via a different chemical pathway that achieves complete polymerization at lower temperatures. This parameter change in reaction mechanism eliminates thermal degradation while ensuring complete curing, as the thiol-benzoxazine reaction is highly efficient and proceeds to completion at reduced temperatures
4Ease of manufacture
If high melt temperatures are used, then good processability is achieved, but material thermal degradation occurs during mixing and molding
Solution Approach 1:
The modified benzoxazine compound with thiol groups exhibits different thermal and rheological properties, enabling good processability at lower melt temperatures. The chemical structure change reduces the temperature required for mixing and molding operations while maintaining adequate fluidity and workability, thereby preventing thermal degradation during these critical manufacturing steps
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 novel benzoxazine compound cures at lower temperatures, reducing heating and cooling times, saving energy, and preventing material degradation during mixing and polymerization, while maintaining suitable properties for various applications.
Implementation Method 1
Benzoxazine compounds are known as thermosetting resin raw materials that, when heated, undergo ring-opening polymerization of a benzoxazine ring to cure
Implementation Method 2
A novel benzoxazine compound with benzoxazine rings at both ends of a linking group and a thiol group, which can cure at low temperatures, is synthesized using a bisphenol compound, an aminothiol compound, and formaldehyde through dehydration condensation
Data Source
AI summary
A benzoxazine compound is represented by general formula (1):wherein R1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, R2 represents a divalent group having 1 to 10 carbon atoms, and X represents a single bond, an oxygen atom, a sulfur atom, a sulfonyl group, a carbonyl group, or a divalent group represented by general formula (1a) or general formula (1b), andwherein R3 and R4 each independently represent hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, or an aryl group having 6 to 12 carbon atoms, R3 and R4 are optionally bonded to each other to together form a cycloalkylidene group having 5 to 20 carbon atoms, Ar1 and Ar2 each independently represent an aryl group having 6 to 12 carbon atoms, and * represents a bonding position.