Ultrafine glass wool obtained by centrifugation and preparation method thereof

Abstract

The invention discloses ultrafine glass wool obtained by centrifugation. The ultrafine glass wool comprises 63.0-66.5wt% of SiO2, 1.4-3.0wt% of Al2O3, 5.5-7.5wt% of CaO, 1.5-3.0wt% of MgO, 0.4-1.3wt% of K2O, 14.2-16.0wt% of Na2O and 5.5-7.6wt% of B2O3. The Al2O3 content is in a range of 1.4-3.0% so that liquid glass crystallization tendency is reduced, fibers are flexile and burr and fractures are avoided; and the B2O3 content is in a range of 5.5-7.6% so that liquid glass viscosity is reduced at a fiber formation temperature of 1050+ / -10 DEG C and fibers are thinned easily. The diameters of 90% of the glass wool fibers are normally distributed in a range of 2-4 microns and the lengths of 92% of the glass wool fibers are normally distributed in a range of 2-3 centimeters. The invention also discloses a preparation method of the ultrafine glass wool. The preparation method comprises the following steps of selecting raw materials satisfying requirements, putting the raw materials into a kiln, carrying out melting to obtain transparent liquid glass, introducing the transparent liquid glass into centrifugation heads, and carrying out fibration at a flow rate of 76+ / -2kg / h at each centrifugation head to obtain the ultrafine glass wool. The ultrafine glass wool has a low heat conduction coefficient, uniform layering and good sound-absorbing and heat-insulation performances. The ultrafine glass wool can be used for preparation of sound-insulation and noise-reduction cotton felt in an airplane cabin plate, sound-insulation and heat-insulation cotton felt for the wall and roofing, heat insulation plates, and other sound-absorbing and heat-insulation products.

Description

technical field [0001] The invention relates to the field of glass wool, in particular to the field of centrifugal superfine glass wool. Background technique [0002] Centrifugal glass wool is to melt the recovered flat glass and other raw materials into molten glass at high temperature, and the glass molten glass is thrown out of the high-speed rotating centrifugal disk to form a fiber, and then it is drawn into an inorganic fiber with a diameter of 1-8 μm by a high-temperature flame for the second time. Cotton-like fibers. Because the glass wool fibers cross each other and have certain elasticity, many independent pores are formed inside the glass wool, and the independent pores greatly increase the way of heat and sound transmission, so the glass wool has the function of sound absorption and heat insulation. Glass wool is widely used in the fields of building sound insulation, wall insulation, petrochemical pipeline insulation and battery glass fiber absorbent partitions...

AI Technical Summary

Problems solved by technology

However, the performance of the ultra-fine glass wool produced by the prior art generally cannot meet such requirements

[0003] Chinese patent 101811824A (published on August 25, 2010) discloses a method for producing ultra-fine glass wool. The glass wool produced by this method is composed of SiO 2 64.5~66%, Al 2 o 3 with Fe 2 o 3 The sum is 2.6~2.9%, B 2 o 3 4.8-5%, the sum of CaO and MgO is 10.6-11%, Na 2 O and K 2 The sum of O is 15.8-16%. This method can produce ultra-fine glass wool with a diameter of 2-5 μm, but the disadvantage of this method is that B 2 o 3 The content is low, the fiber is difficult to refine, and the requirements for the process conditions are very high. The cotton fiber is easy to have burrs, easy to break, and not soft enough, and the diameter and length of the ultra-fine glass wool produced have a large dispersion and cannot show a normal distribution.

This directly leads to the fact that the sound-absorbing and heat-insulating properties of the glass wool cannot meet the requirements of special fields.