Preparation method of large-size glass beads with refractive index larger than or equal to 1.7 and bead forming device of large-size glass beads

Abstract

The invention discloses a preparation method of large-size glass beads with the refractive index larger than or equal to 1.7 and a bead forming device of the large-size glass beads. The bead forming device disclosed by the invention comprises a discharging funnel; the discharging funnel is connected with a feeding end of an alloy furnace tube of a calcining furnace; the alloy furnace tube is driven by a first engine to rotate; a thermocouple and an electric heating wire are arranged in the calcining furnace; the thermocouple and the electric heating wire are connected with a temperature controller outside the calcining furnace; a discharging end of the alloy furnace tube is connected with a material receiving funnel; and a movable hammer driven by a second engine and used for knocking thealloy furnace tube in a reciprocating mode is arranged at the discharging end of the alloy furnace tube. The preparation method comprises the following specific steps of: preparing a batch, melting the batch, carrying out water quenching, preparing a water-quenched frit with a middle size, and forming beads by using a bead forming device. The glass beads prepared by the preparation method and thebead forming device are more than 1mm in diameter, good in optical performance, high in mechanical strength, high in stability and high in yield, and the production cost can be reduced while the productivity is improved.

Description

technical field [0001] The invention relates to the technical field of glass microsphere production, in particular to a method for preparing large-sized glass microspheres with a refractive index greater than or equal to 1.7 and a beading device thereof. Background technique [0002] Glass beads are a new type of silicate material, which has the characteristics of transparency, adjustable refractive index, directional retro-reflection, smooth surface, electrical insulation, etc., and is often used as reflective signs or road pavement signs. [0003] At present, the reflective glass beads used in traffic signs and art propaganda in the market are generally glass beads with a small refractive index. Reflective glass beads are used as reflective signs or road pavement signs in roads and traffic. There are shortcomings of insufficient reflective performance and insufficient reflective distance, especially in rainy nights, the visibility on road traffic is greatly reduced, and th...

AI Technical Summary

Problems solved by technology

All-weather high-refractive glass beads have strong reflective effect and reflective function, so they are getting more and more attention from the market. However, high-refractive glass beads with high reflective properties are more and more widely used, and the number of products produced on the market is difficult. meet their real needs

[0005] At present, there are many methods for preparing glass microspheres on the market, such as powder method, melt method, flame flotation method, etc., but they all prepare glass microspheres with a general refractive index, and there are no methods for preparing high-refractive glass microspheres Common, especially for all-weather beading and burning of glass beads, usually only a single method of pure air or gas is used, and the prepared glass beads are difficult to meet the requirements of high refractive index

In the methods of preparing high refractive index glass microspheres in the prior art, some methods ensure that the raw materials are fully heated by increasing the flame length of the combustion gas when burning in the bead forming furnace, so that the raw materials can be completely melted, thereby increasing the yield, and within 1- Cool it down within 30s to reduce internal stress and ensure the optical properties of glass beads. It can mass-produce glass beads with a diameter of 150-1060 μm and a refractive index of 1.90-1.95, but this method requires a longer flame length. , will increase the height of the beading furnace, and the temperature gradient of the flame in the length direction is too large, which will affect the stability of the product; The higher output and higher stability of bead production can realize large-scale mass production, but for large-scale high-refraction glass beads, especially glass beads with a diameter of more than 1mm, this method cannot be used to produce very well. It is produced in large quantities, the scrap rate is high, and the optical properties and mechanical strength of the produced glass beads are not very good, which greatly increases the production cost of the manufacturer

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