Glass Fiber Composition Balancing Biosolubility and Wet-Heat Strength

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Solution Overview

Problem

Long glass fibers with biosolubility are prone to strength degradation and filament cutting due to exposure to water or high humidity environments, leading to product deterioration.

Innovation Solution

A glass composition comprising specific ranges of SiO2, Al2O3, B2O3, MgO, and CaO, with a MgO/CaO ratio of 0.29 to 1.92, ensuring biosolubility and maintaining high strength even in adverse conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If long glass fiber with biosolubility is used, then biosolubility is improved, but water resistance deteriorates

Engineering Contradiction:

ImprovebiosolubilityVSAvoidwater resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the glass fiber by precisely controlling the content ratios of MgO (2.00-18.00 mass%) and CaO (5.00-25.00 mass%) with a specific MgO/CaO ratio (0.29-1.92). This parameter optimization allows the glass fiber to achieve both biosolubility (≥100 μg/h) and improved water resistance, resolving the contradiction between these two properties.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If long glass fiber with biosolubility is used, then biosolubility is improved, but filament strength deteriorates

Engineering Contradiction:

ImprovebiosolubilityVSAvoidfilament strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the chemical composition parameters, specifically setting MgO content at 2.00-18.00 mass%, CaO content at 5.00-25.00 mass%, and MgO/CaO ratio at 0.29-1.92. This parameter control enables the glass fiber to maintain filament strength of 2.1 GPa or higher even after water absorption, while achieving biosolubility of ≥100 μg/h, thus resolving the contradiction between biosolubility and strength.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If long glass fiber is exposed to water or high humidity environment, then biosolubility is improved, but product durability deteriorates

Engineering Contradiction:

ImprovebiosolubilityVSAvoidproduct durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the chemical composition parameters of the glass fiber by controlling MgO (2.00-18.00 mass%), CaO (5.00-25.00 mass%), and the MgO/CaO ratio (0.29-1.92). This composition optimization reduces the harmful effects of water and humidity exposure, allowing the glass fiber to maintain its strength and structural integrity over time while retaining biosolubility, thereby improving product durability without sacrificing biosolubility.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12459856B2Glass composition for glass fiber, glass fiber, glass fiber woven fabric, and glass fiber reinforced resin composition

Publication Date: 2025.11.04 NITTO BOSEKI CO LTD

AI summary

To provide a glass composition for glass fiber that includes biosolubility, can achieve long fiber formation, and can provide a glass filament with sufficiently high strength even when exposed to water and a high temperature and high humidity environment. The glass composition for glass fiber of the present invention includes 35.00 to 50.00% by mass of SiO2, 12.00 to 28.00% by mass of Al2O3, 10.00 to 25.00% by mass of B2O3, 2.00 to 18.00% by mass of MgO, and 5.00 to 25.00% by mass of CaO, with respect to the total amount, and the total content of MgO and CaO is 17.09 to 30.00% by mass and MgO/CaO is 0.29 to 1.92.