JP2003190839A - Liquefaction nozzle, coater provided with the same, and method for forming cured resin film using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquefaction nozzle to prevent the scattering of resin dust in the coating using a two component collision mixing type gun, a coater provided with the same, and a method for forming a cured resin film using the same. <P>SOLUTION: In the liquefaction nozzle which is attached to a discharge port of the two component collision mixing type gun and with which sprayed particles sprayed from the two component collision mixing type gun are collided with the inside wall of the nozzle to be liquefied, the length of a part having 5-20 mm inside diameter is ≥100 mm. The coater has the two components collision mixing type gun provided with the liquefaction nozzle. The cured resin film is obtained by applying a two component quick curing type resin composition having ≥5 min finger touch based curing time on a base material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefying nozzle for converting atomized particles sprayed from a two-liquid impingement mixing gun into a liquid,
The present invention relates to a coating machine having the same and a method for forming a cured resin film using the same.

[0002]

2. Description of the Related Art A floor used as a floor material in a room such as a building is generally obtained by forming a cured resin film of resin on concrete. Examples of such a cured resin film include the polyurea resin composition disclosed in JP-A-58-188643.

Such a polyurea resin composition is a solventless high-viscosity liquid composed of a polyamine component and a polyisocyanate component, and is spray-coated while the polyamine component and the polyisocyanate component are mixed by using a special collision mixing spray device. For example, concrete,
It is used as an anticorrosion coating for wood and steel plates. Since such a polyurea resin composition has excellent resin properties such as hardness, strength, and heat resistance and super fast curing property, it has been attracting attention in terms of quality and shortening of construction period.

However, the polyurea resin composition is
Due to the high reactivity of amine components and isocyanate components, it is necessary to apply these components by spray painting which sprays these components while colliding and mixing at high pressure during coating.
When this is applied to the floor as it is, there is a problem that resin dust is scattered. In addition, the obtained cured resin film is likely to contain bubbles inside, and it may not be possible to obtain uniform film physical properties.

On the other hand, when a static mixer is used as a coating method in which resin dust does not scatter and then is mixed, a mixing failure occurs due to the influence of solidified substances adhering in the mixer over time. In some cases, uniform film properties cannot be obtained.

[0006]

DISCLOSURE OF THE INVENTION The present invention is directed to a liquefaction nozzle that eliminates scattering of resin dust when coating with a two-liquid collision mixing type gun, a coating machine equipped with the liquefaction nozzle, and a cured resin film using the same. An object is to provide a forming method.

[0007]

SUMMARY OF THE INVENTION The present invention is a nozzle that is attached to the discharge port of a two-liquid collision mixing gun and liquefies spray particles sprayed from the two-liquid collision mixing gun by colliding with the inner wall of the nozzle. The liquefaction nozzle is characterized in that the length of the portion having an inner diameter of 5 to 20 mm is 100 mm or more. Here, the tip preferably has an inner diameter of 5 mm or more.

Further, according to the present invention, the liquefaction nozzle described above is used.
The coating machine is equipped with a discharge port of a liquid collision mixing type gun.

Further, in the present invention, a two-liquid fast-curing resin composition having a finger touch curing time of 5 minutes or more is applied to a base material using the above-mentioned coating machine to obtain a cured resin film. And a method for forming a cured resin film. Here, it is preferable that the two-component quick-curing resin composition has a finger-touch curing time of 120 minutes or less.
A two-component polyurea curable resin composition and / or a two-component polyurethane curable resin composition, and the substrate is a floor substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The liquefaction nozzle of the present invention is attached to the discharge port of a two-liquid collision mixing type gun, and atomizes the particles sprayed from this gun against the inner wall of the nozzle for liquefaction. Is.

The liquefaction nozzle of the present invention has an inner diameter of 5 to 20 mm.
The length of the portion is 100 mm or more. This part is 2
This is a part for liquefying by spraying the spray particles sprayed from the discharge port of the liquid collision mixing type gun with the inner wall at a part having an inner diameter of 5 to 20 mm to cause them to aggregate. If the inner diameter portion is shorter than 100 mm, the spray particles that have collided with the inner wall are not sufficiently liquefied to generate resin dust, or bubbles are generated inside the cured resin film obtained by entraining bubbles,
Traces of bubbles may remain on the surface. In terms of practicality, preferably 1
00-250 mm, more preferably 150-2
It is 50 mm. Further, if the inner diameter is out of the above range, the spray particles colliding with the inner wall may not be sufficiently liquefied or may stay in the nozzle and harden.

Further, in the liquefying nozzle of the present invention, the inner diameter of the portion other than the above is not particularly limited, and the inner diameter may vary, but the inner diameter of the portion attached to the discharge port of the two-liquid collision mixing gun is Generally, it can be appropriately selected so as to be slightly larger than or equivalent to the diameter of the discharge port of the two-liquid collision mixing type gun to be attached. If the inner diameter is too large as compared with the diameter of the discharge port, the efficiency of collision with the inner wall may be low, or the liquefied spray particles may stay in the nozzle and harden.

The shape of the liquefying nozzle is not particularly limited, and may be, for example, a straight shape or a bent shape in the middle. The inner diameter of the tip of the liquefaction nozzle is preferably 5 mm or more. If it is smaller than 5 mm, the speed of the liquefied spray particles discharged from the above-mentioned tip at the time of coating will be too fast, so when it hits the base material, it will bounce with its force, and it will be scattered into the surroundings and bubbles will form. Bubbles or traces of bubbles may occur in the cured resin film obtained by being caught. Further, the shape of the tip of the liquefaction nozzle is not particularly limited, and if the inner diameter of the tip of the nozzle is 5 mm or more, it may be narrowed down, open in a trumpet shape, or in the nozzle tip direction. It may be cut obliquely with respect to.

The two-liquid collision mixing type gun to which the above-mentioned liquefaction nozzle is attached is not particularly limited, and for example, as a proportion unit, H-200 manufactured by Gasmer Inc. in the United States.
No. 0, H-3500 manufactured by US Gasmer, FF-1600 manufactured by US Gasmer, two-component high-pressure discharge mixing machine MODEL HF-100 manufactured by Toho Machine Industry Co., Ltd., and the like. Examples of the mixed coating gun for a high-pressure two-liquid collision mixing type spraying device having a mechanical self-cleaning mechanism include "GX-7 gun" manufactured by US Gasmer Co., Ltd. and "GX-7-400 gun manufactured by US Gasmer Co., Ltd."", Etc., and examples of those having an air cleaning mechanism include" Probler gun "manufactured by Grasscraft, Inc. of the United States.
The collision mixing pressure of these guns is usually 6 to 15 MPa.

The coating machine of the present invention is characterized in that the liquefaction nozzle is provided at the discharge port of the two-liquid collision mixing type gun.

In the method for forming a cured resin film of the present invention, the above-mentioned coating machine is used to coat a base material with a two-component rapid curing type resin composition having a finger touch curing time of 5 minutes or more. It is characterized by obtaining. The coating conditions are not particularly limited, and for example, the cured resin film thickness is 2 to 20 mm. A cured resin film can be obtained by passing a predetermined curing time after coating.

In the method for forming a cured resin film according to the present invention, when the touch-curing time of the two-liquid fast-curing resin composition is less than 5 minutes, the cured resin composition discharged from the gun body is stored inside the liquefying nozzle. It hardens little by little and gradually clogs up, making it impossible to apply enough paint. From the viewpoint of practicality, the finger touch curing time is more preferably 120 minutes or less. In the present specification, the finger touch curing time means the time until the fingerprint is no longer attached even when the resin composition applied at room temperature is touched with a finger.

Such a two-liquid fast-curing resin composition comprises, for example, a polyisocyanate component and a polyamine component and / or a polyol component. From the viewpoint of coating workability, the components of the above-mentioned two liquids are heated to, for example, a temperature at which a viscosity capable of collision mixing can be sufficiently maintained, for example, 40 ° C. or higher before being supplied to a coating machine. It is preferable.

The product obtained by using the polyamine component is composed of a polyurea resin composition, and the product obtained by using the polyol component is composed of a polyurethane resin composition. Moreover, what is obtained when a mixture of a polyamine component and a polyol component is used consists of a polyurethane / polyurea resin composition. Among them, the polyurea resin composition can be preferably used. Examples of commercially available products of this type include Toughguard R-P and Toughguard R-PN (both manufactured by Nippon Paint Co., Ltd.).

Examples of the polyisocyanate component include organic polyisocyanates, isocyanate prepolymers, and mixtures thereof. The organic polyisocyanate is not particularly limited, and known polyisocyanates and the like can be used, and examples thereof include aromatic polyisocyanates and aliphatic polyisocyanates. As the above-mentioned isocyanate prepolymer, for example, a part of the isocyanate groups in the organic polyisocyanate has a number average molecular weight of 200 to 800.
Partial prepolymers obtained by reacting with a polyol of 0 can be mentioned.

The polyamine component is not particularly limited, but for example, except polyoxyalkylene polyamine and toluene diamine, it does not have an electron-withdrawing group in the aromatic nucleus and is located at a position adjacent to the amino group. A mixture of an activated aromatic diamine having an alkyl substituent having 5 or less carbon atoms can be preferably used.

Examples of the polyoxyalkylene polyamines include those having a number average molecular weight of 200 to 10,000 and containing two or more aliphatically bonded amino groups per molecule. For example, the terminal hydroxyl group of polyoxyalkylene polyol having at least two or more hydroxyl groups is hydrogenated.
It can be obtained by a method of reacting with ammonia under high temperature and high pressure using a dehydrogenation catalyst.

As the active aromatic diamine having no electron-withdrawing group in the aromatic nucleus and having an alkyl substituent having a carbon number of 5 or less at the position adjacent to the amino group, specifically, except the above-mentioned toluenediamine, specifically, , 1,3-dimethyl-2,4-diaminobenzene, 1,3-diethyl-2,4-diaminobenzene, 1,3-dimethyl-2,6-diaminobenzene and the like.

The above-mentioned polyol component is not particularly limited, and for example, polyether polyol,
Examples thereof include polyester polyol and hydroxyl group-containing acrylic resin. Further, in order to adjust the physical properties of the obtained cured resin film, a low molecular weight one having a number average molecular weight of 62 to 1000 and a high molecular weight one of 1,000 to about 10,000 may be used in combination.

The mixing ratio of the polyisocyanate component to the polyamine and / or polyol component is such that the equivalent ratio of amino groups and hydroxyl groups in the polyamine and / or polyol component to the isocyanate groups in the polyisocyanate component is 1 / 0.7-1 / 1.5
Is preferable.

In addition to the above-mentioned components, the above-mentioned two-liquid fast-curing resin composition may contain, for example, plasticizers, flame retardants, fillers, various stabilizers and colorants which are usually used for paints. Auxiliaries such as

The substrate in the method for forming a cured resin film of the present invention is not particularly limited, and examples thereof include the floor surface of a building made of concrete or mortar. Specifically, the entire floor surface of these buildings, or a portion in which a coated portion is divided by a mold or the like can be given.

In the cured resin film forming method of the present invention, it is preferable that the shortest distance between the base material and the tip of the liquefaction nozzle is 100 cm or less.
If the distance is more than 100 cm, when the two-liquid rapid-curing resin composition applied from the nozzle during coating hits the base material, it will bounce off with its force, and will be scattered into the surrounding area.
Bubbles or traces of bubbles may occur in the cured resin film obtained by entraining bubbles.

[0029]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 Toughguard R-P (a two-component polyurea curable resin composition manufactured by Nippon Paint Co., a molar ratio of isocyanate group / amino group of 1/1, finger-curing time of 90 minutes) was applied to the ejection port. A GX-7 gun (manufactured by Gasmer) equipped with a liquefaction nozzle having a length of 100 mm, an inner diameter of 10 mm, and an inner diameter of 5 mm at the tip of the nozzle shown in FIG. 1 was surrounded by a mold installed on a floor laid with black paper. A 100 × 100 cm polypropylene plate was applied so that the cured resin film thickness was 10 mm. At this time, the shortest distance between the nozzle tip and the polypropylene plate was set to 100 cm. Also, the first 2
It was blown away for ~ 3 seconds and was not used. Tough guard R-
P was composed of A liquid and B liquid, each was heated to 60 ° C. at the time of coating, and the collision mixing pressure was 10 to 14 MPa. Two
After a lapse of time, a test plate having a cured resin film formed thereon was obtained.

Examples 2 to 4 Liquefaction nozzle lengths of 150, 200 and 2 respectively
A test plate was obtained by coating in the same manner as in Example 1 except that the thickness was 50 mm.

Example 5 Length 150 mm, Inner Diameter 20 mm and Tip Inner Diameter 1
Example 2 except using a liquefaction nozzle of 0 mm
Coating was performed in the same manner as in (1) to obtain a test plate.

Comparative Example 1 A test plate was obtained by coating in the same manner as in Example 1 except that spray coating was performed without using the liquefying nozzle.

Comparative Example 2 A test plate was obtained by coating in the same manner as in Example 1 except that the length of the liquefying nozzle was 50 mm.

<Evaluation Test> The black paper after coating and the obtained test plate were evaluated as follows. The evaluation results obtained are shown in Table 1. (1) Scattering of resin dust The presence or absence of resin dust remaining on the black paper around the polypropylene plate after each coating was visually evaluated. The evaluation criteria are as follows. ◯: Dust scattering is not observed ×: Dust scattering is observed (2) Presence or absence of air bubbles After visually observing the surface condition of the film of each test plate, the film is cut with a cutter knife, and from the cross section The internal state of the film was evaluated in the same manner. The evaluation criteria are as follows. ⊚: No bubbles or air bubbles are observed on the surface or inside. ○: Some air bubbles are observed on the surface, but no air bubbles are observed. ×: No air bubbles are observed on the surface or inside. Traces of bubbles can be seen

[0036]

[Table 1]

As is clear from Table 1, the two-liquid rapid-curing resin composition is applied by using a two-liquid impingement mixing type gun having a liquefaction nozzle of a predetermined length attached to the discharge port. It was found that generation of resin dust at the time can be suppressed, and generation of bubbles and marks of bubbles on the surface and inside of the obtained cured resin film can be controlled.

[0038]

The liquefaction nozzle of the present invention is for liquefying the spray particles sprayed from the discharge port of the two-liquid collision mixing type gun by colliding with the inner wall of the nozzle. Therefore, when coating is performed using the coating machine of the present invention using this, there is no scattering of resin dust, which has been a problem in conventional spray coating, and the effect on the environment can be minimized.

The coating machine of the present invention is not a modified two-liquid collision mixing type gun, but the liquefaction nozzle is attached to its discharge port, so it is very inexpensive and It is possible to attach and detach the nozzle depending on the substrate to be applied.

In the method for forming a cured resin film of the present invention, a two-liquid fast-curing resin composition having a finger touch curing time of 5 minutes or more is applied using the above-mentioned coating machine. It is possible to obtain a smooth appearance and uniform film properties without containing bubbles on the surface and inside.

[Brief description of drawings]

FIG. 1 is a view showing a cross-sectional shape of a tubular nozzle.

[Explanation of symbols]

1 Liquefaction nozzle 2 tip 3 Part to be attached to the discharge port of 2-liquid collision mixing type gun

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Claims (7)

[Claims] 1. A two-liquid collision mixing type gun, which is attached to a discharge port,
A nozzle for liquefying the spray particles sprayed from the two-liquid collision mixing gun by colliding with the inner wall of the nozzle,
A liquefaction nozzle characterized in that a portion having an inner diameter of 5 to 20 mm has a length of 100 mm or more. 2. The liquefaction nozzle according to claim 1, wherein the tip has an inner diameter of 5 mm or more. 3. A coating machine comprising the liquefaction nozzle according to claim 1 or 2 at the discharge port of a two-liquid collision mixing type gun. 4. A two-liquid fast-curing resin composition having a finger touch curing time of 5 minutes or more is applied to a substrate by using the coating machine according to claim 3 to obtain a cured resin film. A method for forming a cured resin film, comprising: 5. The method for forming a cured resin film according to claim 4, wherein the two-liquid fast-curing resin composition has a finger-touch curing time of 120 minutes or less. 6. The method for forming a cured resin film according to claim 4, wherein the two-component rapid curing type resin composition is a two-component polyurea curing type resin composition and / or a two-component polyurethane curing type resin composition. . 7. The method for forming a cured resin film according to claim 4, wherein the base material is a floor base material.