JPS5888138A - Glass composition for fiber - Google Patents

Abstract

PURPOSE:To provide a glass composition for fiber, having excellent alkali resistance, good spinnability, and composed of specific ratios of SiO2, ZrO2, CaO, MgO, Na2+K2O, ZnO, Al2O3 and Fe2O3. CONSTITUTION:A glass composition for fiber composed of 55-65wt% (hereinafter called as %) SiO2, 12-20% ZrO2, 1-8% CaO, 0.5-4% MgO, 12-18% Na2O+K2O, 0.5-4% ZrO, <=1% Al2O3 and <=1% Fe2O3. The E-glass or C- glass, which is conventional glass fiber composition used for the reinforcement of resin, rubber, gypsum, etc., has large surface area per unit weight and poor alkali resistance, and accordingly, is not suitable for the reinforcement of cement, etc. It was difficult to obtain a satisfactory glass composition, because an attempt to improve the alkali resistance causes the deterioration of the meltability and the break of the filament during spinning. The adoption of the above composition eliminates the disadvantages, and gives satisfactory results.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass composition for fibers, and an object of the present invention is to provide a glass composition with excellent alkali resistance and spinning workability.

Tongfu E glass or C glass is used as the 41111 composition for glass fibers.
Rubber and stone l1f4 are used for reinforcing various types of furniture, but because the surface area per unit heavy electric current is large and they are easily degraded by alkali, they are not suitable for reinforcing alkaline substances such as cement.

Various sand compositions have been proposed to improve the alkali resistance of glass fibers, but when trying to improve the alkali resistance, the meltability of the Nobuko raw material deteriorates or the occurrence of yarn breakage during spinning production. Workability is likely to decrease;
It has been difficult to obtain a glass composition with good alkali resistance.

The inventor of the present invention repeatedly conducted research to solve the above-mentioned acid sites, and as a result, the result was 1310.55 to 65 wt%.

ZrO212-20wt%, Ca01-8wt%, M
tOα5-4 wt%, Nago+! 50
12-18 wt%, ZnOα5-4 wt%.

Ajlo, 1. t% or less, IPI20.1 wt%
By adopting a glass composition that becomes wood fiber-like below t%,
We have found that a suitable paper can be used and propose it as the present invention.

Next, the present invention will be explained in detail.

S10. is the main forming component of glass, and is added in relation to the amount of each component, but in general, when t of 810 is increased, the q-kneading property decreases, and the viscosity (at a given temperature) tends to increase. be.

Reducing the electric power of Z r 02 lowers the viscosity and improves the meltability, and also lowers the devitrification temperature and improves the workability of yarn harvesting, but the alkali resistance decreases. Conversely, increasing the t of Z r O2 improves the alkali resistance, but increases the viscosity and deteriorates the meltability, and also increases the devitrification temperature and deteriorates workability.

Decreasing the amounts of OaO and MrO lowers the devitrification temperature and improves workability, but increases viscosity and deteriorates meltability. Conversely, increasing the amount of CaO and MrO lowers the viscosity and improves meltability, but increases the devitrification temperature and impairs workability.

When the total amount of Na20 + K2O is reduced, alkali resistance improves, but the viscosity increases and W? I'm scared of lil. Conversely, when Na20+ is increased by 20, the viscosity decreases and the meltability improves, but the alkali resistance decreases by one point.

If the amount of ZnO is reduced, the raw material cost will be reduced, but the alkali resistance will deteriorate, the viscosity will increase, and the meltability will deteriorate. Conversely, increasing the amount of ZnO improves alkali resistance [7] and decreases viscosity [7], improving meltability, but increases raw material cost.

By controlling the amounts of the components in the glass composition of the present invention within the above-mentioned ranges, it was possible to obtain glass fibers with excellent alkali resistance. Furthermore, the meltability of the glass raw material was extremely good, and there were few occurrences of thread breakage during the spinning operation, resulting in extremely good workability.

Next, examples of the present invention will be shown.

Glasses having the compositions of Examples 1, 2.3 and Comparative Example 1.2 shown below were melt-spun [7], and the yarn breakage rate during spinning and the alkali resistance of the spun glass fibers were compared and studied.

Regarding the alkali resistance of the spun glass fiber, see Example 1.
．． No difference was observed between the compositions of Comparative Example 2.5 and Comparative Examples 1 and 2, but the yarn breakage rate during spinning was lower than that of Comparative Example 2.
When the case of 100 is taken as 100, the values were 82.85.89.95 in Examples 1 and 2.3 and Comparative Example 1, respectively.

Claims (1)

[Claims] 5in1 55~65wt%, ZrO212~20wt
%, CaO1-8wt%, MfOα5-4wt%+N
a20 + r, 20 12-18 at%, ZnO
α5~4wt%+A 40HI W t% or less, F
A glass composition characterized in that it consists essentially of more than e20,1 wt%.