Low-Melting-Point Glass Composition for Crystallization Control
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Solution Overview
Problem
Conventional low-melting-point glasses are prone to crystallization and foaming during low-temperature molding, limiting their suitability for processes like extrusion, injection, and press molding, and resulting in reduced transparency of molded objects.
Innovation Solution
A glass composition with 8-25% P, 8-40% Sn, 20-80% O, and 1-50% F, with a controlled structure around OH groups, achieving a glass transition temperature of 300°C or lower and an infrared absorption spectrum ratio of A3240/A3100 between 0.6 and 1.2, inhibiting crystallization and foaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional low-melting-point glass is used for low-temperature molding, then the glass transition temperature is reduced, but the glass is prone to crystallization and foaming
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by incorporating specific amounts of P (8-25 mol%), Sn (8-40 mol%), and F (1-50 mol%). This compositional parameter change reduces the glass transition temperature to 300°C or lower while simultaneously adjusting the infrared absorption spectrum ratio A3240/A3100 to 0.6-1.2, which suppresses crystallization and foaming during low-temperature molding processes.
Solution Approach 2:
The patent creates a composite glass system combining multiple elements (P, Sn, F, O) with specific compositional ratios. This composite material approach allows the glass to achieve low glass transition temperature through the combined effects of different components while the specific composition prevents crystallization by creating a complex atomic structure that resists ordered arrangement.
2Loss of energy
If conventional low-melting-point glass is molded at low temperature, then energy consumption is reduced, but transparency is compromised due to foaming
Solution Approach 1:
By optimizing the chemical composition parameters (P: 8-25 mol%, Sn: 8-40 mol%, F: 1-50 mol%) and controlling the infrared absorption spectrum ratio A3240/A3100 to 0.6-1.2, the glass achieves low glass transition temperature for energy-efficient molding while the specific compositional parameters prevent foaming and crystallization, thereby maintaining high transparency in the molded product.
3Ease of manufacture
If the glass transition temperature is lowered for easier molding, then moldability is improved, but the molding-temperature margin becomes narrow
Solution Approach 1:
The patent achieves a glass transition temperature of 300°C or lower through specific compositional parameters (P: 8-25 mol%, Sn: 8-40 mol%, F: 1-50 mol%), providing excellent moldability. Simultaneously, the controlled infrared absorption spectrum ratio A3240/A3100 of 0.6-1.2 indicates suppressed crystallization, which widens the practical molding-temperature margin by preventing the narrow temperature window problem associated with conventional low-melting-point glasses.
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 glass exhibits excellent moldability, transparency, and water resistance, allowing for successful low-temperature molding without crystallization or foaming, and maintains a wide molding-temperature margin, enabling the production of transparent molded objects with improved bonding strength and gas barrier properties.
Implementation Method 1
the glass having a glass transition temperature Tg of 300° C. or lower
Implementation Method 2
the glass is inhibited from crystallizing or foaming
Implementation Method 3
the glass giving an infrared absorption spectrum satisfying A3240/A3100 of 0.6-1.2, where the A3100 is an absorbance per 1-mm thickness at a wavenumber of 3,100 cm−1 and the A3240 is an absorbance per 1-mm thickness at a wavenumber of 3,240 cm−1
Data Source
AI summary
The invention relates to a glass including, as represented by mol % based on elements: 8-25% of P; 8-40% of Sn; 20-80% of O; and 1-50% of F, in which the glass has a glass transition temperature Tg of 300° C. or lower, and the glass gives an infrared absorption spectrum satisfying A3240/A3100 of 0.6-1.2, where the A3100 is an absorbance per 1-mm thickness at a wavenumber of 3,100 cm−1 and the A3240 is an absorbance per 1-mm thickness at a wavenumber of 3,240 cm−1.