JPH0275377A - Powder and liquid mixing and coating method - Google Patents

Abstract

PURPOSE:To prevent he remaining of a mixture at the tip of a fine pipe and to eliminate the clogging of the fine pipe due to the invasion of the mixture in the fine pipe at all by adhering a powder agent to a liquid agent to form a mixture at the tip of the fine pipe and supplying the liquid agent through the fine pipe 6 to drip the mixture. CONSTITUTION:A container 1 made of polypropylene is filled with a liquid agent and the liquid is supplied to the tip of a fine pipe 7 through said pipe 7 to adhere a powder agent to the liquid droplet 10 at the tip of the pipe 7 and a globular powder/liquid mixture 13 is formed to the tip of the fine pipe 7. The liquid agent is slightly supplied to the tip of the fine pipe 7 through said pipe 7 to impart flowability to the powder/liquid mixture 13 while the powder/liquid mixture 13 is dripped to a region to be coated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves mixing a liquid agent and a powder agent and applying the mixture to small areas.
This invention relates to a powder-liquid mixing coating method that polymerizes and hardens.

[Conventional technology]

Conventionally, the method consists of a liquid agent composed of a radically polymerizable methacrylate or acrylate monomer and a radical polymerization promoter, and a powder agent composed of a methacrylate polymer or copolymer and a radical polymerization initiator, and the liquid agent and the powder agent are When polymerizing and curing the mixture, the most typical example of the liquid agent is:

methyl methacrylate monomer and a small amount of a polymerization accelerator such as a tertiary amine; the most typical example of the powder is
Polymerization initiators such as polymethyl methacrylate and benzoyl peroxide, which are widely used in dental materials and the like.

When a large amount of these materials is used, a method is used in which the powder and the liquid are stirred and mixed in the same container, and then the mixture is filled into a predetermined area.

On the other hand, if the amount used is small, fill it in small areas.

In the case of application, the so-called brush stacking method is used, in which the powder is attached to the tip of a small brush impregnated with the liquid, forming a bead-shaped powder mixture, and the mixture is filled and applied to a predetermined area.
This brush stacking method allows easy mixing of powder and liquid, and allows easy filling and application to small areas.

[Problem to be solved by the invention]

The conventional brush stacking method has the following problems. -■ Because a large amount of the powder-liquid mixture remains at the tip of the brush during use and polymerizes and hardens, the tip of the brush must be constantly cleaned with liquid or a special cleaning solution, making the cleaning operation complicated and requiring continuous use. I can't.

■ If the brush is left unattended after use, the remaining mixture will harden and the brush will become unusable.

■ When you dip the brush directly into the liquid in a large container.

Since the liquid agent becomes contaminated, it is necessary to divide the liquid agent into small containers, which requires small containers and time.

■ During use, the liquid in the small container evaporates, giving off an odor, and the small container may fall over.

■ After use, the remaining liquid in the small container must be discarded because it is contaminated by the powder from the tip of the brush.

It is uneconomical.

The present invention takes the above points into consideration and aims to provide a powder-liquid mixing and coating method that does not require a cleaning operation, can be used continuously, and can effectively utilize a liquid.

[Failure to solve the problem]

In order to solve the above-mentioned problems, the powder-liquid mixing coating method of the present invention uses radically polymerizable methacrylate or
-) A liquid agent consisting of a monomer and a radical polymerization accelerator, and a powder agent consisting of a methacrylate polymer or copolymer and a radical polymerization initiator, and the liquid agent and the powder agent are mixed and applied. In a powder-liquid mixing coating method in which the liquid agent is cured by polymerization, the liquid agent is supplied through a thin tube to the tip of the thin tube, and droplets of the liquid agent are formed to such an extent that they do not drip onto the tip of the thin tube. A bead-shaped powder/liquid mixture is formed at the tip of the capillary by attaching the powder and dissolving or partially dissolving the powder in the droplet, and then passing it through the capillary to the tip of the capillary. The method is characterized in that a small amount of the liquid agent is supplied to impart fluidity to the powder-liquid mixture, and the powder-liquid mixture is dripped onto the application site.

[For production]

The powder-liquid mixing coating method of the present invention configured as described above includes:
A droplet is formed at the tip of the capillary by the liquid agent supplied through the capillary, a powder is attached to the droplet to form a bead-shaped powder/liquid mixture, and then a small amount of the solution is supplied through the capillary. By imparting fluidity to the mixture and dropping the mixture, there is almost no mixture left at the tip of the capillary after dropping.
and.

Continuous use is possible as there is no possibility of the mixture entering the thin tubes and clogging them.

Furthermore, after use, the inside and outside of the tube can be cleaned by simply dropping 1.2 drops of the liquid agent.

Furthermore, since there is no need to divide the liquid into small containers, the trouble of creating one small container can be saved, and there is no problem of the odor of the liquid being released or the small container tipping over, and the liquid can be used effectively.

〔Example〕

Examples will be described in detail.

(Liquid agent) In addition to the above-mentioned methyl methacrylate, examples of the radically polymerizable methacrylate or acrylate monomer used in the liquid agent of the present invention include ethyl methacrylate, isobutyl methacrylate, n-butyltu-tacrylate, 2-hydroxyethyl methacrylate, Included are monomethacrylates or noacrylates such as ethylhexyl methacrylate and lauryl methacrylate, di- or tritacrylates or acrylates such as ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol, and trinotyolpropane methacrylate.

These may be used alone or two or more types may be blended.

Next, examples of the radical polymerization accelerator used in the liquid preparation of the present invention include tertiary amines such as NN'-dimethylaniline, NN'-diethylaniline, NN'-dimethylp-toluidine, and tolyldetanolamine.

The amount of the radical polymerization accelerator to be added varies depending on the type of monomer used and the type and amount of the radical polymerization initiator (described later), but is 0.05 to 5% based on the total amount of monomers used.
It is preferable to set it within the range of weight %.

(Powder) The methacrylate polymer or copolymer used in the powder of the present invention includes homopolymers such as polymethyl methacrylate and polyethyl methacrylate, methyl methacrylate/ethyl methacrylate copolymer, and methyl methacrylenide/n-butyl. Copolymers such as methacrylate copolymers are included.

Even if these polymers or copolymers are used alone,
Also, two or more types may be used in a blend.

Next, the radical polymerization initiator used in the powder of the present invention includes diacyl peroxides such as benzoyl peroxide and lauroyl peroxide.

The amount of the radical polymerization initiator added varies depending on the composition of the monomers used, the type and amount of the radical polymerization promoter, but is preferably set within the range of 0.1 to 5% by weight.

(dropper) An example of a dropper used in the present invention is shown in FIG.

In the figure, (1) is a container made of polypropylene, which is filled with the liquid agent. (2) has screws (3
) is formed in the medium diameter part of the container (1), and (4) is formed in the medium diameter part (
2) is the small diameter part formed at the tip of (5) is the small diameter part (4)
Pour into the spout at the tip of the pipe.

(6) is a cylindrical connector whose base is removably fitted into the small diameter portion (4); (7) is a thin tube whose base is fixed to the tip of the connector (6) with adhesive (8); (9) is a cylindrical cover with a bottom, and when not in use, the opening of the cover (9) is fitted into the connector (6) to protect the thin tube (7).

When not in use for a long period of time, remove the connector (6) from the small diameter part (4) and attach the cap (not shown) to the medium diameter part (2).
It is screwed onto the screw (3) of the container (1) to prevent the liquid from evaporating or flowing out.

(Coating method) The coating method of the present invention using the dropper is shown in FIG. 2(a).
, (b), and (C).

Point the tip of the thin tube (7) of the dropper downward and insert it into the container (1).
Lightly press the side wall of the container (1) with your fingers, and supply the liquid agent in the container (1) through the thin tube (7) to the tip of the thin tube (7).

As shown in FIG. 2(a), a droplet QO of about half a drop of the liquid agent is formed at an angle of 0 degrees so as not to drip onto the tip of the thin tube (7).

Next, as shown in FIG. 2(b), the receiver transfers the droplet QO onto the powder (2) dispensed onto the plate Qυ, and the droplet α
Attach powder @ to Q.

Then, the powder agent (2) is dissolved or partially dissolved in the droplet αQ to form a bead-shaped powder/liquid mixture a3 at the tip of the thin tube (7), as shown in FIG. 2(C).

After that, the container (1) is slightly pressed and a small amount of liquid is supplied to the tip through the thin tube (7) to give fluidity to the powder-liquid mixture (to), as shown by the broken line in Fig. 2 (C). Then, drop the powder/liquid mixture (to) onto the application area.

(Container) The container (1) may be a polypropylene eye dropper or
It may be made of any material as long as it is not attacked by the liquid, and may be made of glass or the like. However, in the case of materials that do not deform, such as glass,
A thin tube (7) is selected that allows the liquid agent to drip naturally at a constant rate by placing the tip of the thin tube (7) downward. In addition, the dripping of the liquid agent is adjusted by the inclination angle of the thin tube.

If the container is made of glass, the bottom may be an opening, a flexible cap made of a material that is not affected by the liquid agent may be fitted into the opening, and the cap may be pressed.

(Thin tube) The inner diameter of the thin tube (7) is appropriately selected depending on the viscosity of the liquid agent used, the desired rate of dropping the mixture, etc.
A range of 5 to 1.0 flφ is preferable.

That is, when the inner diameter becomes smaller than 0.051111φ.

It takes considerable time and force to supply the liquid to the tip of the capillary (7). Furthermore, when the inner diameter is larger than 1.0 WMφ, it is extremely easy to supply the liquid agent.

If the capillary (7) is directed downward, natural dripping of the liquid will occur.

The outer diameter of the capillary (7) is preferably as small as possible in accordance with the inner diameter in order to reduce the contact area of the powder-liquid mixture (13) to the capillary (7) and prevent adhesion.

The shape and length of the thin tube (7) may be appropriately designed depending on the application, such as the shape of the area around the application site 2, and may be curved or linear.

The tip of the capillary (7) is cut perpendicularly to the axis of the capillary (7) as shown in Figure 1, or diagonally as shown in Figure 3 to determine the area of the end surface of the capillary (7). You can make it bigger.

The outlet of the thin tube (7) is the 1MI tube (
The outlet port 7) may be formed on the upper surface three or more times away from the tip of the thin tube (7). In this case, since the liquid from the outlet (14) travels along the tube wall to the tip, the outlet 0
4) Powder-liquid mixture 03 enters and does not block the outlet side.

In addition, as shown in Fig. 5, manufacturing can be facilitated by closing the opening at the tip of the thin tube (7) in Fig. 1 with a filler OFJ and forming an outlet α→ communicating with the thin tube (7). Become.

The inner diameter of the thin tube (7) does not necessarily have to be the same,
As shown in Fig. 6, there is a narrow part Q61 at the base of the thin tube (7).
can be formed to facilitate adjustment of liquid drug supply.

As shown in Figure 7, the outer shape of the thin tube (7) can be made by making the base side thicker and the tip side thinner, and cutting the tip side depending on the purpose.
The end area of the capillary (7) can be adjusted.

The material of the thin tube (7) is preferably a corrosion-resistant material such as stainless steel.

(Automatic Cloth) As a means of supplying the liquid to the tip of the thin tube, a metered liquid dispensing device capable of finely adjusting the amount is used, and the thin tube is attached to the tip of the tube of the device, and the amount and timing of the liquid to be discharged is strictly controlled. Control and form the powder-liquid mixture, move it to the application site,
By automatically controlling the dropping of the powder/liquid mixture, etc., it is possible to perform continuous coating work unattended.

(Experimental Example) A liquid agent was prepared by stirring and mixing 90 parts of methyl methacrylate, 5 parts of 2-hydroxy methacrylate, 5 parts of ethylene glycol dittacrylate, and 0.6 part of NN'-dimethyl P-toluidine at room temperature for 10 minutes.

The powder was 60 parts of polymethyl methacrylate with an average particle size of 50 μm and an average molecular weight of 400,000, and an average particle size of 30 μm.

40 parts of polyethyl methacrylate with an average molecular weight of 300,000,
It was prepared by mixing 0.6 parts of benzoyl peroxide in a V-shaped blender for 1 hour.

Then, the solution was put into a polypropylene eye drop container with an internal volume of 10 mJ, and the nozzle of the container, that is, a thin tube with an inner diameter of 0
．． Attach a syringe needle with a diameter of 2n, an outer diameter of 0.4jff, and a length of 21jff, with the tip of the syringe needle facing down, and lightly press the side wall of the container to form a droplet of about half the size at the tip of the syringe needle, and then inject. The tip of the needle was inserted into a container containing the powder, and the powder was deposited around the droplet, forming a beaded powder mixture.

Next, the injection needle was moved onto the acrylic plate at a distance of 30aII with the ball-shaped powder-liquid mixture still attached.

The side wall of the container was lightly pressed again to supply some liquid, and the powder-liquid mixture was dropped onto the acrylic plate.

Thereafter, the above operation was repeated 50 times, and as a result, there was no problem of the injection needle becoming blocked during the operation, and the injection needle could be used continuously.

In addition, as a result of carrying out the above-mentioned brush stacking method using the liquid agent and powder agent of the above-mentioned experimental example, the mixture adhered to the tip of the brush after three repetitions, making it impossible to perform the operation.

〔Effect of the invention〕

Since the present invention is constructed as described in one or more of the above descriptions, it achieves the advantages described below.

A liquid agent is supplied to the tip of the capillary through the capillary, a droplet is formed at the tip of the capillary, a powder is attached to the droplet to form a bead-shaped powder/liquid mixture, and then the solution is passed through the capillary. Add some fluidity to the mixture and drip the mixture.
After dropping, no mixture remains at the tip of the capillary, and continuous use is possible without cleaning the tip of the capillary.

Moreover, after use, the tip of the capillary can be easily cleaned by dropping just one or two drops of the liquid agent, and the powder-liquid mixture will not harden at the tip of the capillary and block the capillary.

Furthermore, there is no need to divide the liquid medicine into small containers as in the past, and there is no need to prepare and dispense small containers.

Furthermore, since the liquid is divided into small containers and not exposed, troubles such as the release of odor from the liquid and overturning of the small containers do not occur.

Moreover, unlike in the past, the liquid medicine divided into small containers is not contaminated and discarded, so the liquid medicine can be used effectively.

[Brief explanation of the drawing]

The drawings show an embodiment of the powder-liquid mixing and coating method of the present invention, and FIG. 1 is a sectional view of an example of a dropper, and FIG. 2(a) is a cross-sectional view of an example of a dropper. (b) and (c) are front views showing the coating process;
Figure 4. FIGS. 5, 6, and 7 are cutaway front views showing each side of the capillary. (7)...tubule, 0I...droplet, 02...powder, α
1... Powder-liquid mixture.

Claims (1)

[Claims] (1) A liquid agent consisting of a radically polymerizable methacrylate or acrylate monomer and a radical polymerization promoter, and a powder agent consisting of a methacrylate polymer or copolymer and a radical polymerization initiator; In a powder-liquid mixing coating method in which powders are mixed and applied to polymerize and cure, the liquid agent is supplied to the tip of the capillary through a capillary, and the droplets of the solution are supplied to the tip of the capillary to an extent that the droplets do not drip onto the tip of the capillary. forming the powder, adhering the powder to the droplets, dissolving or partially dissolving the powder in the droplets to form a bead-shaped powder/liquid mixture at the tip of the capillary, and then passing it through the capillary. A powder-liquid mixing and coating method, characterized in that a small amount of the liquid agent is supplied to the tip of the thin tube to impart fluidity to the powder-liquid mixture, and the powder-liquid mixture is dripped onto the application site.