JPS5854870B2 - Floor painting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming thick synthetic resin coatings having patterns.

In recent years, demand for thick synthetic resin coatings has been increasing as building materials, especially flooring and wall materials.

In particular, polyurethane resin has the advantages of being able to be painted on-site, providing a seamless finish, and having excellent weather resistance and abrasion resistance, so it has been used in many construction projects as a flooring material for gymnasiums and as a paving material for sports stadiums. I'm giving it away.

However, this on-site paintable resin coating forming material has drawbacks such as being only available in a single color and having pinholes and craters easily noticeable on the surface.

Therefore, attempts have been made to make pinholes and craters less noticeable by adding patterns to the coating surface.

The pattern forming method includes, for example, (1) Immediately after forming an uncured resin coating film, a pattern is formed on the surface with a thickness of 0.1-0.5 gm and a size of 1.
A method in which approximately 100 m4 of colored flakes are scattered and a top coat is evenly applied after the resin has hardened to form a flooring material with a flaky pattern. or (3) a method in which a resin film-forming material is applied onto a substrate and cured. There are methods such as printing the pattern later,
Each of these methods has the following drawbacks.

In other words, in method (1), a top coat is required on top of the sprayed flakes in order to make the flakes adhere to the underlying coating, and in method (2), the flakes tend to peel off after curing. However, it requires advanced technology to mix granules uniformly, and it is difficult to create a pattern on the surface due to sedimentation of the granules after coating. Method (3) is not necessarily the preferred method as it can sometimes cause air bubbles to form.The method (3) tends to wear the printing surface due to friction and cause the pattern to disappear, and there is currently no good method for repairing it. Not practical.

In view of these circumstances, the inventors of the present invention have conducted intensive research on a method for forming a synthetic resin coating film with a pattern free from the above-mentioned defects.As a result, we have developed a completely new pattern formation method that is resistant to wear and tear with little effort. We have completed an invention for a method for forming thick coatings with difficult patterned surfaces.

That is, in the present invention, a fluid paint containing an uncured resin is coated thickly on a base material to form a base, and the viscosity is 50%.
0 50075 cps, the surface has a thixotropy of 1
．． 6-20, an uncured thixotropic resin paint having a specific gravity equal to or higher than that of the base and having good adhesion to the base is applied so as to form a pattern with the base, and then cured. This is a method of forming a coating film with

The base materials used in the present invention are those mainly used as building materials, such as concrete, mortar, slate, wood, and metal.

A fluid paint containing an uncured resin is applied thickly onto this base material.

Examples of the resin to be applied onto the base material include polyurethane resin, epoxy resin, polyester resin, silicone resin, SBR, acrylic resin, vinyl acetate resin, and copolymer resins thereof.

These include the so-called thermosetting type, which is cured by the reaction between an uncured resin and a curing agent;
Examples include a so-called thermoplastic resin solution in which a resin in the form of a dispersion hardens by drying after application, an emulsion type, and a combination of these three types.

For example, specific examples of polyurethane resin, epoxy resin, and acrylic resin are as follows.

1. In the case of polyurethane resin (1) A two-component polyurethane resin that is cured by the reaction of a polyisocyanate prepolymer and a curing agent (eg, polyol, polyamine).

(:1) A one-component temperature-curing polyurethane resin that cures with polyisocyanate and humidity in the air.

(iii) A polyurethane resin solution in which a linear polyurethane resin is dissolved in a solvent such as dimethylformamide or tetrahydrofuran.

2. In the case of epoxy resin (1) A two-component epoxy resin obtained by reacting an epoxy resin made into an aqueous dispersion by an appropriate method and a water-soluble curing agent.

3o In the case of acrylic resin (i) Aqueous dispersion of acrylic resin.

After coating, these resins change from a low viscosity and fluid state to a high viscosity gel or solid state that does not flow easily due to chemical reactions, solvent evaporation, water evaporation, etc.

In other words, it changes from a low viscosity liquid (approximately 500 cps) to a viscous liquid (approximately 500 cps) due to chemical or physical changes.
cps), it becomes gel-like, and then changes into a solid state.

The fluidity referred to here is rheologically referred to as Newtonian fluid.

It refers to the property of a substance that continues to be deformed by an extremely small external force, and chemically speaking, a fluid substance is equivalent to an oligomer whose molecular weight has not increased significantly.

In addition, gel-like is called a non-Newtonian fluid in terms of rheology, and it has the appearance of a solid at first glance, but has the properties of both a solid and a fluid that exhibits fluidity above a certain external force (called a yield value). It refers to a state in which the person also has the following functions:

Curing refers to changing into a solid state.

In this way, the resin hardens through a fluid region and a gel-like region, but
The process of this change varies depending on the type of resin, its form (reactive type or solvent type, etc.), temperature, etc.

Generally, as in the present invention, a thick coating of resin (approximately 0.2 mπ
In the paint industry, applying more than this is called thick coating.)
When using it as a base, if you apply something with an extremely low viscosity, the resin will penetrate into the base material or a uniform coating will not be obtained.
It is better to use up to the s-position.

On the other hand, when the viscosity of the base resin increases to 5 million cps or more, even if an uncured thixotropic resin paint is applied over it in a discontinuous ring shape, the thixotropic resin does not settle into the base resin, and the paint The intended purpose of the invention is not achieved.

Therefore, in the present invention, the viscosity of the base resin is 50
While the temperature is between 0 and 5 million cps, an uncured thixotropic resin paint is applied to the surface together with the base so as to form a pattern.

When applying uncured thixotropic resin at a construction site, to check whether the viscosity of the base resin is within an appropriate range, for example, after preparing the base resin, transfer a portion of it to a cup of 1 to 2 CrfL.
It is sufficient to take it to a height of 1, leave it in a working atmosphere, drop a few drops of thixotropic resin on it, and see if the drops settle. If they do, it is considered to be within an appropriate range.

In addition, if you prepare the base resin under a certain atmosphere and measure the relationship between the elapsed time after application and the resin viscosity in the laboratory,
The viscosity of the resin at the construction site can also be estimated based on the elapsed time after preparation and application.

A thixotropic resin is a resin that is non-fluid when no stress is applied, becomes fluid when stress is applied, and becomes non-fluid again when the stress is removed. In the invention, the thixotropy (viscosity at 20 RPM/viscosity at 2 RPM) is 1.5-20. Preferably,
3-10 are used.

If the thixotropy is 1.5 or less, since the resin has fluidity, a convection phenomenon occurs in the base resin after painting, and the mutual melting occurs and spreads, causing the pattern to smear.

If the thixotropy is 20 or more, it is often difficult to spray or otherwise apply the coating itself.

On the other hand, if the thixotropic resin has a moderate thixotropy of about 1.5-20, it can be easily sprayed, and even if it exists in the form of particles in the fluid resin, it will not deform unless stress is applied. It does not dissolve and hardens while forming a clear pattern.

It is better if the specific gravity of the thixotropic resin and base resin is between the two, or if the thixotropic resin is heavier than the base resin, but the viscosity of the base resin and the conditions when spraying the thixotropic resin, such as droplets of thixotropic resin, are important. The degree of embedding into the base resin varies depending on the size of the powder and the pressure at the time of spraying.

The object of the present invention is to provide a coating film in which a pattern is attached with a part of the surface exposed and embedded, so that the adhesion is strong and the pattern does not disappear even if the surface is abraded to some extent. It is necessary to apply the thixotropic resin to such an embedded state.

Therefore, as mentioned above, in addition to the application conditions, the relationship between the specific gravity of the thixotropic resin and the base may be equal to or higher than that, and in particular, an increase of 5 to 10% is preferable.

Although the combination of base resin and thixotropic resin has good adhesion to each other, it is not sufficient that the final cured products have good adhesion to each other.

It is not preferable if the upper and lower resins become compatible during coating or if the reaction of either resin is inhibited.

For example, if an acrylic emulsion of thixotropic resin is painted on a base consisting of a urethane prepolymer and a curing agent, the water in the emulsion reacts with the urethane prepolymer and foams, resulting in a uniform, smooth floor surface. Sometimes I can't.

Therefore, the combination of base resin and thixotropic resin is
Good adhesion to each other, i.e. the same type of resin, such as urethane and epoxy, and even different resins such as urethane and epoxy, polyester and urethane, etc., have an adhesive peel strength of 50 g/cTL or more when completely cured. This is desirable.

■ The upper and lower resins must not be completely compatible.

In other words, if the base resin and thixotropic resin are compatible with each other, the pattern may become blurred, which may not meet the purpose of the present invention.

Specifically, this example applies when the base resin is of a solution type and the erodible resin dissolves in the base solvent.

■ There should be no components that would inhibit the mutual reaction between the upper and lower resins.

That is, if such a component is contained, the reaction of the resin may be stopped and the resin may remain uncured forever, or an abnormal reaction may occur depending on the case, and the intended purpose may not be achieved.

Specifically, as mentioned above, urethane and water are examples.

Examples of methods for applying the thixotropic resin include spraying with a spray gun, mortar gun, ricing gun, etc., spraying, and dropping.

In short, any coating method may be used as long as it can form a discontinuous pattern in the form of dots, lines, or islands.

Any color of thixotropic resin may be used for coating. The curing of the predator resin is exactly the same as that of the base resin.

Next, the following points can be mentioned as effects of the present invention.

1. Patterns can be painted on-site.

2. A wide variety of patterns are possible.

3. Because a resin with good adhesion is used and the pattern is applied while it is embedded, there is no peeling or falling off of the pattern.
Even when the surface wears down, new patterns appear one after another on the surface.

4 By forming such a patterned surface, defects in the appearance of the base, such as foaming, pinholes, cracks, etc., can be hidden.

Example 1 Urethane prepolymer (Takenate F1) made from TDI and polypropylene glycol on a concrete floor
30) and a compound manufactured from aromatic polyamine (
A blue two-component polyurethane resin paint (specific gravity 1.27) consisting of Takerac PC3100) was applied to a thickness of 211LrIL.
It was applied to.

After application, when the viscosity of the coating resin reached 14,000 cps, a white paint (thixotropic) consisting of a compound made from a predatory urethane prepolymer (Takenate F555) made from TDI and PPG and finely powdered silica and an aromatic amine was applied. A thin spray gun (nozzle diameter; For white resin: 5.0 mm, for red resin: 2.0 mm
) at a discharge pressure of 4 kg/m, and at room temperature
It was left to stand for 4 hours to harden.

A surface view of the obtained coating surface is shown in FIG. 1, and a cross-sectional view of the coating film is shown in FIG. 2.

In FIGS. 1 and 2, 1 is a base paint, 2 is a white paint, 3 is a red paint, and 4 is a base material.

Comparative Example 1 The first layer (base layer) was formed using the same resin as in Example 1 using the same method, and the thixotropy was 1.0 and 1.0, respectively.
The same red and white resins as in Example 1 were sprayed in the same manner as in Example 1, except that 1.2.

**As a result, the sprayed resin was diffused on the surface of the base resin, giving a smudged pattern that was completely different from that of Example 1.

Moreover, there was almost no sedimentation and only the surface was colored all over.

Example 2 A resin whose main components are epoxy resin (Epikoat 828)/polyethylenetetramine was applied as a primer on a concrete floor under the conditions shown in Table 1, an epoxy resin was applied as a base layer on top of the primer, and predatory urethane was applied on top of that as a base layer. A resin was applied to form a painted surface with a pattern.

The thus obtained cured coating film had a circular pattern with a particle size of about 0, i to 1, and the thixotropic resin was almost uniformly precipitated in the cross section.

Part of this coating was peeled off and tested using a taper abrasion tester. As a result, no thixotropic resin fell off, and a new pattern surface continued to appear even when the surface layer was worn away.

Example 3 Two slate boards with a thickness of 2 d and an area of 2 d were prepared, and were designated as A board and B board, respectively.

A two-component urethane coating material consisting of a urethane prepolymer (Takenate F128) made from TDI and polypropylene glycol and a compound (Takelac PC4600) whose main components are aromatic polyamine and glycol was applied to the A board, and a two-component urethane coating material was applied to the B board. A liquid urethane coating material (TAKERAC 1003C) made from XDI and polyester polyol was applied, and urethane resins a and b with thixotropy of 3.5 and 8.8 were applied under the conditions shown in Table 2.
were simultaneously sprayed with a ricin spray gun for 10 minutes at room temperature.
Allowed to cure for hours.

The plane and cross section of the thus obtained coated board are as shown in FIGS. 3-6, respectively, and the resin a having a higher specific gravity was more embedded in the base layer than the resin a having a lower specific gravity.

In addition, in FIGS. 3-6, 5 is a base resin, 6 is a resin a, 7 is a resin, and 8 is a base material.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the coating film with a patterned surface obtained in Example 1, Fig. 2 is a cross-sectional view of the same coating film, and Fig. 3 is a plan view of the coating film of plate A obtained in Example 3. 4 is a sectional view of the same coating film, FIG. 5 is a plan view of the coating film of board B obtained in Example 3, and FIG. 6 is a sectional view of the same coating film.

Claims (1)

[Claims] 1 A fluid paint containing an uncured resin is applied thickly onto the base material to form a base, and the viscosity is 5 to 5 million cp.
s, an uncured thixotropic resin paint with a thixotropy of 1.520, a specific gravity equal to or higher than that of the base, and good adhesion to the base is applied to form a pattern with the base. A method for forming a coating film with a pattern, which is characterized by coating and curing.