JPS5854868B2 - Funtai Toryouno Toso Rabbit Yosei Shikenki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tester for confirming the coating workability of powder coatings.

Recently, in the field of synthetic resin coatings, powder coatings have been developed as coatings that do not contain volatile components such as solvents or water, and they have excellent coating performance such as corrosion resistance. It is attracting attention because of its features such as being able to form a coating film and not causing problems with environmental pollution caused by solvents.

Conventionally, there have been problems with the coating workability of such powder coatings, such as clogging of the powder coating in the paint supply hose to the coating machine, clogging of the powder coating in the nozzle of the coating gun, fixed quantity supply of the coating material, and particle aggregation. It was common practice to conduct coating experiments in advance at a coating experimental plant to confirm properties and other properties.

However, in order to conduct such a coating experiment to confirm coating workability, at least 20 kg of powder paint is required, and in general, the coating process is performed using manufacturing equipment due to the time required, labor, and other factors. In order to manufacture samples for the gender confirmation experiment, at least 100 kg of prototype samples were required for one coating experiment.

This has the problem that it is uneconomical as it requires a great deal of labor, raw material costs, and resources, and at the same time it takes time to obtain results with good coating workability.

Therefore, an object of the present invention is to provide a coating workability tester that eliminates the drawbacks of the above-mentioned conventional coating experiments for confirming coating workability and can quickly confirm the coating workability of powder coatings using a small amount of samples. It is in.

The coating workability tester for powder coating according to the present invention allows powder coating to flow in a housing and determines the powder coating from the difference between the height of the powder coating before flowing and the height of the powder coating after flowing. There is a powder paint coating workability tester for measuring the coating workability of paint, which includes a housing separated into two upper and lower chambers by a porous partition wall, and a housing installed in the lower chamber of the housing. A gas jetting means for uniformly supplying a gas to fluidize the powder paint that is introduced into the housing, and a height that measures the height of the powder paint that is introduced into the upper chamber of the housing. and detection means.

In a preferred embodiment of the powder coating coating workability tester according to the present invention, a rectifying means for rectifying the fluidizing gas is provided below the porous partition wall.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be specifically described below with reference to the accompanying drawings.

In the accompanying drawings showing a preferred embodiment of the apparatus of the present invention, the coating workability tester for powder coatings consists of a housing 10, which has an upper chamber 11 and a lower chamber 12 separated vertically by a porous partition wall 13. Tokara.

The lower chamber 12 is provided with a gas inlet 14 for fluidizing the powder coating material introduced into the upper chamber 11, such as compressed air.
The compressed air is supplied through a gas jetting means for uniformly diffusing and supplying the compressed air, for example, an air diffusion filter 15.

This air diffusion filter 15 is used for supply air of a general powder coating machine, for example, 100 to about 100
Porous filters made of inorganic or organic materials with multiple pore sizes of 0μ can be used.

The lower chamber 12 is further provided with a rectifier plate 16°, for example, 200°, which rectifies the compressed air uniformly diffused by the air diffusion filter 15 so that pressure is applied uniformly to the porous partition wall 13.
A mesh-sized net or canvas is provided directly below the porous partition wall 13.

The porous partition wall 13 allows the compressed air supplied into the lower chamber 12 to be uniformly dispersed and ejected into the upper chamber 11 at a uniform pressure.
It is provided to fluidize the powder coating material introduced into the upper chamber 11.

For this porous partition 13, it is desirable to use a uniformly dispersed porous filter with a pore diameter of about 10 to about 500 μm, preferably about 150 to about 300 μm, but it is also possible to use other conventional filters that can uniformly fluidize the powder coating. fluidization means can also be applied.

A predetermined amount of powder paint 17 for checking coating workability is put into the upper chamber 11, and compressed air is supplied through the porous partition wall 13 to fluidize the powder paint.

However, the present inventors have determined the difference between the height Hl of the powder coating when it is introduced, that is, before fluidization, and the height H2 after fluidization when the powder coating is fluidized under certain conditions. It has been found that H2H2-H1 has a high correlation with the coating workability of the powder coating described above.

That is, the greater the flow height H, the better the coating workability of the powder coating becomes.

Therefore, by testing a predetermined amount of powder coating with known coating workability under predetermined test conditions and verifying the correlation between coating workability and flow height H in advance, it is possible to test any powder coating with known coating workability. Paint workability can be determined.

As a means for detecting the flow height H, in the embodiment shown in the attached figure, a scale 18 is provided to visually measure the heights Hl and H2 before and after the flow.

For this purpose, in the embodiment shown in the accompanying drawings, the upper chamber 11 is a transparent container made of transparent acrylic resin, for example.

Of course, a conventional powder needle such as an ultrasonic type can be used as the flow height detecting means, and in this case, the upper chamber 11 does not necessarily need to be rubbed with a transparent container.

A general powder dust collection or collection device can be installed at the top of the tester to collect fine powder of the fluidized powder coating.

According to the powder paint coating workability tester according to the present invention as described above, the coating workability of powder paint can be checked extremely easily and in a short time with a small sample of about 50 (Bli'), The effect is great compared to the conventional technology in terms of labor.

Further explanation will be given below according to examples.

Example 1 Using a cylindrical container made of transparent acrylic resin as shown in the attached diagram with a diameter of 200 mm and a height of 400 mm (upper chamber 300 mm, lower chamber 1007 x 7 Five types of powder coatings A-1 to A with different
-5 was tested for painting workability.

In the test, 500g of powder paint with a roughly constant particle size distribution was put into the upper chamber, the height Hl was measured, and then 1.5kg/cr
/lG of compressed air was supplied to the lower chamber through an air diffusion filter made of acrylonitrile-IJ-styrene copolymer resin with a pore size of 150 to 300μ, and acrylonitrile and styrene with a pore size of 100 to 150μ and a porosity of 37.1%. The powder coating was fluidized by uniformly injecting compressed air into the upper chamber through a porous polymeric resin filter, and the height H2 of the powder coating after fluidization was measured.

Flow height H = H2-Hl measured for each powder coating
) are shown in Table 1 (H18cm constant).

Next, a coating experiment was conducted in an experimental plant using the five types of powder coatings described above according to a conventional method to test the coating workability, and the correlation with the flow height was confirmed.

The results are shown in Table 1. Example 2 Using the same test device as used in Example 1, coating work was carried out on powder coatings B-1 to B-6 of different types and amounts of synthetic resin listed in Table 2. A sex test was conducted.

The test was conducted in the same manner as in Example 1 except that the type of powder coating was different.

The results of the measured flow height H of each powder coating are shown in Table 2.

Next, the coating workability of each of the above powder coatings was confirmed by conducting a coating experiment in an experimental plant according to a conventional method.

The results are shown in Table 2.

[Brief explanation of drawings]

The accompanying drawings are structural diagrams showing preferred embodiments of the coating workability tester for powder coatings according to the present invention. 10... Housing, 11... Upper chamber, 12.
... lower chamber, 13 ... porous partition wall, 15.
・・・・・・Gas body blowing means (air diffusion filter),
16... Rectifying plate, 17... Powder coating,
Hl: Height before flow, H2: Height after flow.

Claims (1)

[Claims] 1 Powder paint coating work in which the powder paint is flowed in a housing and the coating workability of the powder paint is measured from the difference between the height of the powder paint before flowing and the height of the powder paint after flowing. The tester includes a housing separated into two upper and lower chambers by a porous partition, and a powder paint provided in the lower chamber of the housing and charged into the royal chamber of the housing. It is composed of a gas jetting means for uniformly supplying the gas for fluidization, and a height detecting means for measuring the height of the powder paint introduced into the upper chamber of the housing. Features: Powder coating workability tester.