JPH01208341A - Frit composition for enamel and production of said composition and apparatus therefor - Google Patents

Abstract

PURPOSE:To obtain in high efficiency the title uniform frit composition of even smaller particle size, also excellent in various characteristics, by highly applying press force and frictional force on the powder to be treated along the inner peripheral surface of a high-speed agitating vessel to mutually fuse the powdery particles. CONSTITUTION:The objective composition is formed by fused coating of the surface of frit powdery particles with at least one kind of substance selected from resin powder, silicon dioxide and its analogous powder, pigment and coloring aid material and electric charge controlling agent. This composition can be obtained by simultaneously applying compressive force and frictional force on the powder to be treated having the above-mentioned composition while agitating (by a stator 6 and a scraper 7) said powder in a rotary agitating vessel 4 to effect the fused coating of the surface of the frit powdery particles with said ingredients.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is based on 琺1! The present invention relates to a method for producing a frit composition used in the production of products.

(Prior art) Conventionally, to produce a frit composition for enamel, frit powder, resin, pigment, etc. are kneaded using a kneader such as a ball mill, roll mill, or crusher, and the particle size is adjusted by crushing and sieving. It was manufactured by having them do this.

(Problem to be solved by the invention) However, in these conventional methods, the average particle size is usually 20 to 4
It was as coarse as 0 microns and had a wide range of particle size distribution. Furthermore, it takes a very long time to obtain particles with a small particle size, and the efficiency is low. The reason for this was that the resin softened due to the frictional heat during kneading, causing the resins to melt and bond with each other, as well as sticking to the walls of the kneading machine, making it impossible to apply too much force. .

In view of these points, it is an object of the present invention to efficiently produce a frit composition having a small particle size, uniformity, and excellent properties.

(Means for Solving the Problems) The present invention fuses powder particles together by applying strong pressing force and frictional force to the powder to be treated along the inner peripheral surface in a stirring vessel that rotates at high speed. The heating and cooling means are used to maintain the inside of the knee 4 stirring container at an optimal temperature.

(Function) Its action is to apply centrifugal force to the powder to be processed, such as frit powder and resin powder, in the container by rotating the stirring container at high speed, forming a powder layer along the wall surface of the rotating container. By pressing a pressing member against this, strong compressive force and frictional force are applied to these powders to be processed. That is, by passing the powder to be processed through the extremely narrow gap between the pressing member and the inner peripheral surface of the container, extremely strong compressive force and frictional force are applied to the powder layer. In this way, a strong pressure is applied between the particles of the frit powder and the powder to be processed, and the surfaces of both particles are activated, which is a so-called mechanochemical reaction, which causes the particles to bond with each other and become composite. Particles are formed. Moreover, this composite particle can be coated with an extremely uniform and thin layer due to the above-mentioned action, and also has the effect of sizing the frit powder itself due to the pulverizing action by compression grinding, so the particle size can be reduced. It is possible to produce particles with extremely uniform particle size.

Therefore, it is possible to replace the resin powder with other raw material powders, such as silicon dioxide and similar powders for the purpose of improving fluidity, or to fuse and coat these by adding pigments and coloring auxiliary raw materials. can. Additionally, in addition to silicon dioxide, pigments, and similar substances, a charge control agent can be added to the resin coating to produce a frit composition with even better desired properties. can do.

In addition, in order to prevent the resin powder from melting and condensing due to frictional heat in the above process, or to promote coating of the frit powder, the inside of the stirring vessel must be kept in an optimal state. It allows the temperature to be adjusted according to the state.

In addition, when producing an even smaller frit composition, it is effective to first pulverize only the frit powder and then add a coating powder such as a resin.

(Effects of the Invention) According to the present invention, it is possible to extremely efficiently produce a frit composition for enamel in which the particle surface of frit powder is uniformly coated with a resin to form a composite.

This frit composition has a small particle size and is uniform in particle size. In addition, the surface of this frit composition is coated with a charge control agent to adjust the charge characteristics of the frit composition particles themselves, silicon dioxide and similar powders are coated to improve fluidity, and pigments and Coloring by coating with powder such as coloring auxiliary raw materials, etc.
Frit compositions can be made with properties that survive a variety of conditions. In addition, they are difficult to peel off, and because the particles are uniform and small, they do not cause bubbles, pinholes, etc., and the heat resistance and melting temperature can be adjusted.

In addition, since the pigment is fixed in each particle of frit powder, it is possible to create products with uniform color and excellent gloss without uneven coloring, and because the coloring can be blended after adjusting the particle size, it is possible to Color change is easy and productivity can be improved.

Furthermore, since the coloring is bonded to the flint particles, it does not separate easily even when used in wet applications.

Furthermore, when frit powder is coated with titanium dioxide or similar powders, when suspended in a suitable liquid for wet use, it has excellent wetting properties such as improved hydrophilicity and easier dispersion in the liquid. Frit compositions can be made with

(Example) Next, an example will be described with reference to FIGS. 1 and 2. A casing 4 forming a cylindrical processing chamber 5 is attached to a vertical rotation shaft 3 connected to a drive device 2 consisting of an electric motor 2a and a variable speed ti 2b fixed to a machine base 1, and the casing 4 is rotated in the direction of the arrow in the figure. It consists of The rotational speed of the casing 4 is set so that the raw material to be processed inside the casing 4 is pressed against the inner circumferential surface 4a by centrifugal force, and furthermore, so that a distant centrifugal force can be obtained depending on the properties of the raw material to be processed inside the casing 4. Adjustments can be changed. Inside the casing 4, a stator 6 and a school 7 are attached to a support 8 provided through the upper center of the casing 4, with an appropriate gap maintained relative to the inner circumferential surface 4a. The stator 6 and the souffle bar 7 are arranged in the order of the stator 6 and the school 7 in the rotational direction of the casing 4, keeping an appropriate distance from each other, and a plurality of them may be provided if necessary. In addition, the stator 6 is used as a pressing member, and the tip thereof is formed into an arcuate curved surface, and the surface of the tip and the casing 4
The gap between the inner circumferential surface 4a and the inner circumferential surface 4a gradually narrows in the direction of rotation. Note that the support 8 has a raw material supply port 24.
is provided, and a feeder 25 is connected thereto.

Next, the outer periphery of the casing 4 is surrounded by a cover 9 while maintaining an appropriate interval, and the cover 9 is provided with a heating jacket 10, as well as an inlet 11 and an outlet 12 for heating or cooling air.
are provided to form an air passage 13 on the outer peripheral side of the casing 4. A windmill 19 is connected to the outlet 12, and if necessary, the windmill 19 is connected to the inlet 11 for circulation. A heat sink 14 is provided on the outer peripheral surface of the casing 4 for the purpose of improving the cooling effect. The heating jacket 10 is connected to a temperature control device 20 that includes a storage source for a heating medium and a refrigerant, and is supplied and circulated by a pump 21.

Furthermore, a cooling water nozzle 15 is attached to the side surface of the cover 9 toward the outer periphery of the casing 4, and an associated drain port 16 is attached thereto.
is located in the lower position. The waste water from the drain port 16 is sent to the storage tank 22 and is circulated and supplied to the cooling water nozzle 15 again by the pump 23. In addition, passages 1 for heat medium and coolant are also provided inside the stator 6, school 7, and support body 8.
7 is provided and connected to the temperature control device 2°, the temperature of the powder bed is detected by a temperature detector 18 attached to the stator 6, and the inside of the processing chamber 5 is always maintained within the optimum temperature range. .

It should be noted that the heating and cooling means in the casing 4 and the processing chamber 5 can be appropriately selected as necessary.

As described above, in this apparatus, the casing 4 is rotated at high speed as shown in FIG. Body layer F is formed.

The stator 6 is pressed against this powder layer F and the powder layer F of thickness T is
When compressed to the thickness of the narrow gap t with the inner circumferential surface 4a, by applying compression force and frictional force to this powder layer F,
The powder particles in the powder layer F are rubbed against each other,
The contact surfaces of these particles are activated, and furthermore, due to the generation of frictional heat, the particle surfaces of both the frit powder and the resin powder are locally melted and bonded, and another powder is formed on the surface of the frit powder. A composite enamel frit composition coated with a substance is obtained.

Next, as an experimental example, first 500g of frit powder and resin (
Methacrylic acid ester polymer, average molecular weight,
After mixing 50 g of glass transition point 60C), the mixture was charged into the casing 4 and operated.

After about 10 minutes, the edges of the frit particles were removed and the particles were properly pulverized and sized, while resin powder had already adhered to the surface of the frit particles and fusion had begun to occur. After 30 minutes of further operation, a frit composition uniformly formed into composite particles having an extremely uniform particle size with an average particle size of 5 to 20 microns and 10% or less of 30 microns or more was obtained as a product.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an apparatus for carrying out this example, FIG. 2 is an explanatory view of the operation of the apparatus, and FIG. 3 is a sectional view of a frit composition. In the figure, 4...casing, 4a...
...Inner peripheral surface, 6...Stator, 7...
Souffle bar, 10... Jacket, 13...
...Air passage, 17...Medium passage, 18...
... Temperature detector, 20 ... Temperature control device, a
...Frit powder, b...Resin, C.
...It is a charge control agent. Above Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A frit composition for enamel in which the surface of frit powder particles is fused and coated with one or more of resin powder, silicon dioxide and similar powders, pigments, coloring auxiliary raw materials, and charge control agents. (2) By simultaneously applying compressive force and frictional force while mixing and stirring the powder to be treated in a rotating stirring container,
2. The method for producing a frit composition for enamel according to claim 1, wherein the surface of the frit powder particles is fused and coated with one or more of resin powder, silicon dioxide and similar powders, pigments and coloring auxiliary raw materials, and a charge control agent. (3) In a device equipped with a pressing member that mixes and stirs the powder to be treated in a rotating stirring container and applies compressive force and frictional force, heating and cooling means are added to the outer circumferential side of the rotating stirring container and the pressing member. An apparatus for producing a frit composition for enamel according to claims 1 and 2.