Acid-resistant fibreglass composition, acid-resistant glass fibres and method for their production

By adjusting the composition of the glass composition, especially controlling the ratio of ZnO to alkali metal oxides, acid-resistant glass fibers were prepared, solving the problem of short service life of existing glass fibers in acidic environments. This resulted in efficient production and excellent acid resistance, making them suitable for high-temperature filter bags.

CN116655250BActive Publication Date: 2026-06-16ТАЙ'АНЬ ШУНЬМАО НЬЮ МЕТЕРИАЛ ТЕХНОЛОДЖИ КО ЛТД
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ТАЙ'АНЬ ШУНЬМАО НЬЮ МЕТЕРИАЛ ТЕХНОЛОДЖИ КО ЛТД
Filing Date
2023-06-19
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing glass fibers have a short service life in acidic environments. In particular, medium-alkali glass fibers have poor tensile strength and are difficult to produce fine fibers. ECR glass has short service life and poor folding resistance, making it unsuitable for making high-temperature filter bags.

⚗Method used

By adjusting the composition of the glass composition, especially controlling the ratio of ZnO to alkali metal oxides, acid-resistant glass fibers with excellent acid resistance and good fiber drawing properties are prepared. The forming temperature is 60°C higher than the liquidus temperature. The composition includes 52.0-62.9 wt% SiO2, 7.0-17.0 wt% Al2O3, 14.1-25.0 wt% alkaline earth metal oxide RO, 5.0-12.9 wt% alkali metal oxide R2O, and 2.1-7.0 wt% ZnO. The ZnO/R2O ratio is 0.16-1.4, preferably above 0.2, which optimizes the drawing performance of the glass fibers.

🎯Benefits of technology

It achieves efficient production and extended service life of glass fiber in acidic environments, stable production within the fiber diameter range of 5μm-36μm, excellent acid resistance and tensile strength, good flexibility, and is suitable for high-temperature filter bag applications.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application belongs to the technical field of glass fiber, and an acid-resistant fiber glass composition comprises 52.0-62.9 wt% SiO2, 7.0-17.0 wt% Al2O3, 14.1-25.0 wt% alkaline earth metal oxide RO, 5.0-12.9 wt% alkali metal oxide R2O, 2.1-7.0 wt% ZnO and 0-1.0 wt% iron oxide. The acid-resistant glass fiber prepared from the composition has a forming temperature difference greater than 60℃ from the liquidus temperature, is not prone to crystallization during the drawing process, can stably produce ultra-fine glass fiber with a 5.5 μm monofilament diameter, has good acid resistance and good high-speed spinning performance, and the product made of the fiber has excellent folding resistance and can be used in the application field of ePTFE membrane filter material and other application fields with high requirements for fiber acid resistance.
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