Glass Direct Roving Sizing to Reduce Fuzzing and Improve Resin Impregnation
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Solution Overview
Problem
Existing glass direct roving production methods result in fuzzing and decreased lubricity of glass strands, leading to reduced workability and mechanical strength when combined with resin, due to inadequate sizing agent performance during thermal drying.
Innovation Solution
Applying a sizing agent containing an epoxy resin with an epoxy equivalent of 180 to 240, followed by thermal drying at 135° C. to 155° C. for three to five hours, to form a coating on glass filaments, enhancing workability and mechanical strength of the composite material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If thermal drying is performed to remove sizing agent, then the sizing agent is removed from glass filaments, but fuzzing occurs and lubricity decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the sizing agent by specifying epoxy equivalent (180-240) and monomer ratio (35%-55%), and adjusts thermal drying parameters (temperature 135-155°C, time 3-5 hours) to control the removal process. This resolves the contradiction by optimizing both removal efficiency and preservation of glass strand surface quality.
Solution Approach 2:
The patent introduces a specific composition of sizing agent containing epoxy resin and monomer as an intermediary substance. This intermediary facilitates controlled thermal drying while preventing harmful effects like fuzzing and lubricity loss, acting as a mediator between the glass filaments and the thermal processing environment.
2Ease of operation
If glass strand has poor spreadability, then impregnation with matrix resin decreases, but workability is reduced
Solution Approach 1:
The patent optimizes the chemical parameters of the sizing agent (epoxy equivalent 180-240, monomer ratio 35%-55%) to control the surface properties of glass filaments. This creates optimal spreadability that enables both good workability during composite formation and effective impregnation with matrix resin, thereby maintaining mechanical strength.
3Loss of time
If thermal drying temperature is increased to remove sizing agent faster, then drying time decreases, but glass strand surface quality deteriorates
Solution Approach 1:
The patent optimizes the thermal drying temperature parameter to a specific range (135-155°C) that balances drying speed with surface quality preservation. This resolved contradiction shows that moderate temperature with extended time (3-5 hours) is superior to high temperature with short time, maintaining glass strand surface integrity while achieving complete sizing agent removal.
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 method improves the workability and mechanical strength of the glass direct roving, ensuring effective impregnation with resin and reducing fuzzing and lubricity issues, thereby enhancing the mechanical properties of the composite material.
Implementation Method 1
thermally drying the sizing agent at a temperature of 135° C. to 155° C. to form a coating on the surfaces of the glass filaments
Implementation Method 2
thermally drying the sizing agent at a temperature of 135° C. to 155° C.
Data Source
AI summary
Provided is a method for producing a glass direct roving that has excellent workability and can effectively increase the mechanical strength of a composite material obtained by combination with resin. A method for producing a glass direct roving 10 formed by directly winding up a bundle of glass filaments includes the steps of: applying a sizing agent containing an epoxy resin having an epoxy equivalent of 180 to 240 to surfaces of a plurality of glass filaments to bundle the plurality of glass filaments; winding up a bundle obtained by bundling the plurality of glass filaments, thus making a wound package; and thermally drying the sizing agent at a temperature of 135° C. to 155° C. to form a coating on the surfaces of the glass filaments.