Bifunctional Epoxy Binder for RTM Preform Production
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Solution Overview
Problem
Current methods for producing fiber reinforced composite materials using RTM require heating and cooling of the preform mold, which is time-consuming and limits the efficiency of the preform preparation process.
Innovation Solution
A binder resin composition comprising thermosetting resin, thermoplastic resin, and a curing catalyst, specifically a bifunctional epoxy resin with a hydroxyl group, that allows for quick curing and solidification without the need for heating and cooling, enabling faster production of preforms with improved mold-releasability and adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating and cooling of the preform mold is performed to solidify the binder, then the binder provides strong contact between reinforcement fiber base sheets, but the preform preparation period becomes time-consuming
Solution Approach 1:
The invention changes the curing mechanism from thermal (heating/cooling) to chemical (catalyst-driven) by selecting a curing catalyst with an activation energy lower than the binder resin's glass transition temperature. This allows the binder to cure at room temperature or low temperatures, eliminating the time-consuming heating and cooling cycles while maintaining strong adhesive strength between base sheets.
Solution Approach 2:
The invention replaces the thermal field (heating/cooling system) with a chemical field (catalyst system). Instead of using temperature changes to control binder solidification, a curing catalyst is introduced to trigger chemical curing at low temperatures, thereby substituting the thermal process with a chemical reaction process that is much faster and eliminates the need for mold heating and cooling.
2Strength
If a thermosetting resin composition is used as a binder, then strong contact between base sheets is achieved, but heating and cooling of the preform mold is still necessary
Solution Approach 1:
The invention modifies the curing characteristics of thermosetting resin by introducing a curing catalyst with specific properties (activation energy lower than the resin's glass transition temperature). This enables the thermosetting resin to cure at room temperature or low temperatures without requiring heating and cooling cycles, thus maintaining strong contact strength while dramatically reducing preparation time.
Solution Approach 2:
The curing catalyst acts as an intermediary substance that facilitates the curing reaction of the thermosetting resin at low temperatures. The catalyst mediates between the resin and the curing process, enabling the resin to achieve strong adhesion without requiring high temperatures, thereby eliminating the need for heating and cooling the preform mold.
3Strength
If the preform mold is heated to melt the binder, then woven fabric base sheets come in strong contact, but the process requires subsequent cooling to solidify the binder
Solution Approach 1:
The invention replaces the thermal cycle (heating to melt, then cooling to solidify) with a chemical curing process. The curing catalyst initiates polymerization or crosslinking of the binder at room temperature or low temperatures, eliminating the need for both heating and cooling steps. This substitution of thermal processing with chemical processing dramatically improves preform production efficiency while maintaining strong adhesive strength.
Solution Approach 2:
The invention changes the fundamental parameter of curing temperature from high temperature (requiring heating and cooling) to low temperature or room temperature (catalyst-driven). By selecting a curing catalyst with activation energy lower than the binder's glass transition temperature, the curing process occurs rapidly at low temperatures, eliminating the thermal cycle and improving productivity.
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 binder resin composition enables rapid fixation of reinforcement fiber bases and shortens the preform production time by eliminating the need for heating and cooling, while maintaining high adhesive strength and mold-releasability, thus enhancing the productivity of fiber reinforced composite materials.
Implementation Method 1
a binder resin composition comprising thermosetting resin, thermoplastic resin, and a curing catalyst, specifically a bifunctional epoxy resin with a hydroxyl group, that allows for quick curing and solidification
Data Source
AI summary
A binder resin composition for preform production includes thermosetting resin [A], thermoplastic resin [B], and curing catalyst [C], thermosetting resin [A] containing a bifunctional epoxy resin, thermoplastic resin [B] accounting for 10 to 100 parts by mass relative to 100 parts by mass of thermosetting resin [A], and curing catalyst [C] being at least one curing catalyst selected from the group consisting of organic phosphorus compounds, imidazole, and derivatives thereof.