JPH06182291A - Method of coating resin composition - Google Patents

Abstract

(57) [Summary] [Purpose] Easily form a clear embossed surface on a structure without the need for a heating device that heats a polyurethane-forming main agent and curing agent, and disaster prevention measures therefor. Get a possible painting method. [Structure] Polypropylene glycol / diphenylmethanediamine mixed liquid as a curing agent (viscosity 1500 cps / 2
Urethane prepolymer (viscosity 2600 cps / 25 ° C.) as a main component was introduced into a flat chamber (NO. 2) + tip (043-25) -attached probler gun for mixing. After that, the mixture was immediately sprayed on a slate plate in a raindrop state so that the spraying pressure was 170 br (Example 1). [Effect] A clear embossed pattern surface having non-slip properties could be formed without the need for a heating device and its disaster prevention measures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a room temperature curable resin composition on a structure, and more particularly to a waterproof coating, a floor coating, and an emboss finish coating method for obtaining a non-slip surface suitable for paving. Is.

[0002]

2. Description of the Related Art Conventionally, when a room temperature curable resin composition is applied to a structure, the surface is made smooth, so that the viscosity of the spray gun is reduced by virtue of the use of a large amount of diluent, the viscosity of the spray gun is reduced. Have been done. In particular, in recent years, the method of spraying ultra-highly reactive polyurethane / polyurea resin is widely used because the working time can be shortened.

However, in carrying out such a construction method, there is an upper limit to the spraying pressure of the equipment used, and therefore, there is secured a power source for raising the temperature for lowering the viscosity of the material, or the risk of burns due to high temperature, and the material. In order to keep the heat of the discharge hose, a large amount of maintenance material is required for the construction work such as keeping the heat of the discharge hose, and there is a drawback that the energy consumption required for coating becomes extremely large. Moreover, there are many precautions to be taken in painting, and a high level of skill is required for painting work, which is very complicated and labor costs are high.

When the surface is finished in an embossed shape by spraying a structure in such a state by spraying or the like, it is necessary to increase the flight distance so that the flight distance is long before the material adheres to the existing surface. Although there are coating methods such as spraying and reducing the discharge amount, many methods depend on the skill of the operator, and the generality of the coating state tends to be lacking.

[0005]

In any case, the conventional coating method requires a device for heating or keeping the material to be coated warm, and it is necessary to take measures against disasters accompanying it in advance. And the workability of painting is not so good.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a two-component polyurethane resin-forming resin composition excellent in curability in which a main agent and a curing agent are mixed. A coating method in which a polyurethane-forming resin composition is obtained from a main agent having a specific viscosity and a curing agent when the composition is applied to the structure and cured to form an embossed coating film, and the composition is immediately sprayed and cured on the structure. The present invention has been completed by discovering that the use of a specially designed heating device makes it possible to obtain an embossed coated surface very easily without the need for special settings such as setting the spraying angle and disaster prevention measures. Came to do.

That is, the present invention prepares a room temperature curable resin composition by mixing a main agent having a prepolymer having an isocyanate group at a terminal and a viscosity of 1500 cps or more with a curing agent containing a polyol and having a viscosity of 1500 cps or more. The present invention provides an embossing finish coating method characterized by immediately spraying and curing it onto a substrate.

[0008]

[Structure] Examples of structures used in the present invention include houses, buildings, bridges, roads, athletics, tennis courts,
The roof surface, wall surface, floor surface, etc. of the building such as

The present invention is characterized in that a main agent having a specific viscosity and a curing agent having a specific viscosity are mixed, and before the mixture is not completely cured, the composition is immediately sprayed and applied to the structure. Its composition is essentially unimportant.

The base material used in the present invention has a viscosity of 1500 cps.
One of the curing agents to be used in combination with it has a viscosity of 1500 cps or more.

The main agent used in the present invention containing a prepolymer having an isocyanate group at the terminal and having a viscosity of more than 1500 cps is an organic isocyanate compound such as 2,
4-tolylene diisocyanate (hereinafter abbreviated as TDI), 65 / 35-TDI, 80 / 20-TDI, 4,
4'-diphenylmethane diisocyanate (hereinafter, MD
Abbreviated as I), dianisidine diisocyanate, tridene diisocyanate, metaxylylene diisocyanate,
Hexamethylene diisocyanate, phenylene diisocyanate, 1,5-naphthalene diisocyanate, polymethylene polyphenyl polyisocyanate, isophorone diisocyanate, hydrogenated MDI, hydrogenated TDI, etc., selected from aromatic diisocyanates and alicyclic diisocyanates. The organic polyisocyanate compound is used.

Alternatively, a polyol compound such as polyester polyols, polyether polyols, polyester polyamide polyols, polycarbonate polyols, polycaprolactone polyester polyols, polybutadiene polyols, polypentadiene may be used alone or in a mixture thereof. It is selected from polyols, castor oil-based polyols, low molecular weight diols, trimethylolpropane, glycerin, sorbitol, mannitol, dulcitol and the like.

Preferably, the polyether polyols have a molecular weight of about 200 to 10,000, and have a low molecular weight diol, glycerin, trimethylolpropane, hexanetriol, triethanolamine, pentaerythritol, ethylenediamine, tolylenediamine, diphenylmethanediamine, Tetramethylol cyclohexane, methyl glucoside, 2,2,6,6-tetrakis (hydroxylmethyl) cyclohexanol, diethylenetriamine, sorbitol, mannitol, sucrose, etc. were used as starting materials, and alkylene oxides such as ethylene oxide and propylene oxide were added. And preferably an NCO / OH equivalent ratio of 1.5 or more, more preferably 1.5 to 20 reacted NCO group-containing prepolymer alone or as a mixture. Any material selected from the group consisting of materials and / or a solution system in which a plasticizer or a solvent is dissolved may be used.

The curing agent having a viscosity of 1500 cps or more containing the polyol used in the present invention includes, for example, polyester polyols, polyether polyols, polyester polyamide polyols, polycarbonate polyols, polycaprolactone polyester polyols, polybutadiene polyols, It is selected from polypentadiene polyols, castor oil-based polyols, low molecular weight diols, trimethylolpropane, glycerin, sorbitol, mannitol, dulcitol and the like.

Preferably, polyether polyols having a molecular weight of about 200 to 10,000, low molecular weight diols, glycerin, trimethylolpropane, hexanetriol, triethanolamine, pentaerythritol, ethylenediamine, tolylenediamine, diphenylmethanediamine, Tetramethylol cyclohexane, methyl glucoside, 2,2,6,6-tetrakis (hydroxylmethyl) cyclohexanol, diethylenetriamine, sorbitol, mannitol, sucrose, etc. were used as starting materials, and alkylene oxides such as ethylene oxide and propylene oxide were added. Those having a molecular weight of about 200 to 10,000 are preferable.

As the curing agent containing the polyol used in the present invention and having a viscosity of 1500 cps or more, a curing agent or curing accelerator for polyurethane resin and epoxy resin can be used to further accelerate the curing.

As such a thing, for example, 3,3'-
Dichloro-4,4'-diaminodiphenylmethane, 2-
Examples thereof include condensates of chloroaniline and formaldehyde, diethyltoluenediamine, MDA, TDA, ethylenediamine, trioxypropylenediamine, and the like, and any of these alone or as a mixture can be used.

Any known curing catalyst can be used. For example, trimethylamine, triethylamine, tributylamine, N-dimethyllaurylamine, N-diethyllaurylamine, N, N'-methylpiperazine, N, N '. -Dimethylbenzylamine, N-methylmorpholine, N-ethylmorpholine, triethylenediamine, N-pentamethylethylenetriamine, N, N, N ', N'
-Tetramethyl propylene diamine, tertiary amines such as N-polymethyl polyethylene polyamine, and organic metal salts such as calcium octylate, lead octylate, dibutyltin dilaurate, stanna octate, etc., and the like alone. And any mixture can be used.

The amount of these curing catalysts used is preferably 0.01 to 1.0 part by weight, more preferably 0.05 to 1.0 part by weight, based on 100 parts by weight of the organic polyisocyanate compound.
0.50 parts by weight is used

The gelling time (in other words, the curing time of the polyurethane-forming resin composition) when the main agent and the curing agent are mixed is related to the spraying pressure and is not limited, but it is usually easily embossed. When the pattern is formed on the surface of the structure, it is appropriate that the time is 3 to 30 seconds at room temperature (25 ° C.).

In the coating method of the present invention, the composition obtained by mixing the main component and the curing agent may be sprayed and cured on the structure before it is cured. For the spray coating at this time, any conventional high-pressure spray foaming machine can be used.

In the present invention, the mixture discharged from the high-pressure blowing foaming machine may be spray-coated on the structure as it is. However, in the present invention, since the main component having a higher viscosity than the conventional one and the curing agent are used together, In order to prepare a uniformly mixed polyurethane-forming resin composition in a shorter time, a fluid is ejected from a narrow opening, and the pressure of that portion is reduced, whereby the fluid and the fluid existing in the surrounding area are separated from each other. It is preferable to perform spray application by additionally using a mixer having a mechanism for mixing with another type of fluid or a tubular mixer having a plurality of mixing elements without moving parts fixed therein.

In all of the above mixers (1) to (5), there is no driving part in the discharge hole, and they are mixed by the flow of the main agent and the curing agent itself. For example, a stouch mixer, a suction mixing head, a collision mixing head, etc. are used. The mixer which has is mentioned.

In the coating method of the present invention, the discharge state of the mixture is not particularly limited, and it may be discharged in a spray state or a raindrop state. In forming an embossed pattern,
It is preferably applied to the structure in the form of raindrops. When the mixture of the main agent and the curing agent is sprayed onto the structure in the sprayed state, the mixture is likely to be leveled, and the embossed pattern may not be clearly expressed.

In the present invention, since a high-viscosity base material and a curing agent are used, it is easy to discharge in the state of raindrops, and when the mixers (1) to (3) are used, the synergistic effects thereof are combined, and it is better. A clear embossed pattern can be obtained.

The spraying pressure of the mixture for coating the polyurethane-forming resin composition in which the main agent and the curing agent are mixed is not particularly limited, but is usually 140 Br or more. Since the main agent and the curing agent used in the present invention have high viscosities respectively, it is preferable to spray them onto the structure with the above-mentioned pressure in order to obtain a clear embossed pattern.

As the spraying device for spraying the mixture at a pressure of 140 br or more, for example, a device which is discharged by the reciprocating motion of a plunger and has a driving portion such as air pressure driving, oil pressure driving, engine series driving, etc. is used. it can. Preferably, a high-pressure blowing foaming device in which the discharge drive is controlled in accordance with the on / off operation of the spray gun itself,
Particularly preferably, the discharge pressure is 140 br even at room temperature.
The device is used so that the above spraying pressure is obtained.

The main component and curing agent constituting the mixture (polyurethane-forming resin composition) of the present invention may contain, for example, a plasticizer, a process oil, a stabilizer, if necessary, within a range not impairing the effects of the present invention. An ultraviolet absorber or the like can be added and used in combination.

As a result, the NCO group concentration of the prepolymer used in the conventional method is increased to increase the amount of free isocyanate compound to reduce the viscosity, and the material is heated to a high temperature to reduce the viscosity. , It is no longer necessary to adopt a complicated and more energy-consuming coating method such as increasing the temperature of the equipment used to lower the viscosity and heating the discharge hose to maintain the low viscosity.

Therefore, it becomes possible to obtain an embossed coating surface without requiring skill, without using equipment for heating, a heating hose, etc., which makes the coating work very efficient, and Energy can be reduced and economic efficiency is improved.

[0031]

EXAMPLES The present invention will be described in detail with reference to Examples. The invention is not limited to these examples only. Also, "part" and "%" in the text are based on weight unless otherwise specified.

Example 1 Paint pressure delivery tank [Asahi Hanac Co., Ltd. Tileman]
Then, 70 liters of a mixed liquid (viscosity 1500 cps / 25 ° C. or higher) of polypropylene glycol / diphenylmethanediamine = 80/20 wt having a molecular weight of 1500 is weighed as a curing agent. Next, a prepolymer (diphenylmethane diisocyanananate = 100%) as a main component and another unreacted NCO group were added to another paint pressure-feeding and discharging tank (the same product manufactured by the same company).
8%, solid content 100%, viscosity 2600 cps / 25 ° C)
Weigh 70 liters.

It was attached to a probler gun so that the lines of both dispensers could be introduced respectively. This gun has a flat chamber (NO.2) + tip (043-25)
Was attached and used. When the spraying device was operated so that the spraying pressure of the mixture of the main agent and the curing agent was 170 br, the main agent and the curing agent in each of the tanks were mixed, and immediately this mixture was sprayed onto a slate plate. Was discharged onto the board in the form of raindrops.

20 seconds after the end of discharge, a flat non-slip structure surface whose surface was covered with fine irregularities (embossing) could be obtained.

Example 2 A Startsch mixer was attached to the mouthpiece of a mini-probler spray gun, and then a line of an air pressure feeding tank of 7 br was connected in advance to the air line. Next, in the A tank of the coating machine [Asahi Hanac Co. APW-5000],
Main polymer prepolymer (MDI = 100%, unreacted NCO
Base 9%, solid content 100%, viscosity 3000 cps / 25
℃) is charged. On the other hand, the B tank has a molecular weight of 2 as a curing agent.
000 polypropylene glycol / diethyltoluenediamine = 85/15 wt mixture (viscosity 1500 cps
Above).

Each of the two discharge lines was attached to a mini-probler spray gun and operated so that the discharge pressure of both lines became a spray pressure of the gun of 200 br, and the mixture of the main agent and the curing agent was immediately put on a slate plate. When sprayed, the mixture was delivered in the form of raindrops onto the plate.

40 seconds after the ejection, a structure surface whose surface was covered with fine irregularities (embossing) could be obtained. This surface was a flat, non-slip surface that was passable after 5 minutes.

Example 3 A pre-polymer (MDI = 100%, unreacted NCO group 6%, solid content 100%, viscosity 1500 cp) was used as a main component in an A tank of a coating machine [Asahi Hanac Co., Ltd. APW-5000].
s / 25 ° C). Molecular weight of 60 in B tank
0/20 polyethylene glycol / diethyltoluenediamine = 80/20 wt mixture (viscosity 8000 cps / 25
℃) is charged. Both discharge lines are attached to the Probler spray gun, and the discharge pressure of both lines is 200 by the gun spray pressure.
When the mixture was sprayed onto a slate plate by operating so as to produce br, the mixture was discharged in a spray state to a raindrop state D.

Twenty seconds after the ejection, a structure surface whose surface was covered with fine irregularities could be obtained. This surface was a flat, non-slip surface that could pass after 3 minutes.

Comparative Example 1 When the mixture was sprayed onto the slate plate under the same conditions as in Example 1 except that the discharge pressure was 100 br, it was only discharged in filament form from the mouthpiece of the spray gun. Further, this product does not form an embossed pattern, but only forms a wavy uneven surface on the slate plate. Moreover, the surface of this structure was not non-slip.

Comparative Example 2 When the mixture was sprayed onto the slate plate under the same conditions as in Example 2 except that the temperature of the mixture was raised to 70 ° C., it was discharged in a mist form from the mouth part of the spray gun. After 10 seconds, a flat structure surface without fine irregularities and having a glossy surface was merely obtained. Moreover, extra energy was required for heating.

Moreover, this surface was nothing but a non-slip structure surface which could pass after 5 minutes.

Comparative Example 3 When the discharge pressure of Example 3 was operated at 100 br and sprayed onto the slate plate, the discharge product was discharged in the form of threads. The surface formed 20 seconds after the ejection was a surface having large wavy irregularities.

Although the surface was able to pass after 3 minutes, it had rough irregularities and had no flatness, and it was difficult to walk smoothly because the shoe was caught when passing.

From the above results, according to the coating method of the present invention, in order to obtain a non-slip embossed surface, a highly viscous base material and a curing agent are mixed and immediately sprayed on the structure to be cured. It was confirmed that the embossed surface can be easily obtained without using a heating device.

[0046]

Industrial Applicability According to the present invention, a room temperature curable resin composition is prepared by mixing a base material composed of a urethane prepolymer and a curing agent composed of a polyol, and the mixture is immediately sprayed on the structure to be cured to form an embossed surface. When forming on a structure, painting is performed using a high-viscosity main agent and a curing agent, so construction work can be performed at room temperature without the need for a heating device, and measures to deal with disasters must be taken in advance. There is a particularly remarkable effect that there is no need to keep it.

Claims (4)

[Claims] 1. A room temperature curable resin composition is prepared by mixing a main agent containing a prepolymer having an isocyanate group at a terminal and a viscosity exceeding 1500 cps with a curing agent containing a polyol and having a viscosity of 1500 cps or more. An embossed finish coating method characterized by spraying and curing the structure. 2. The coating method according to claim 1, wherein the main agent and the curing agent are mixed through a static mixing device and sprayed as raindrops onto the structure from a single discharge hole. 3. The coating method according to claim 1, wherein the spraying pressure of the mechanical spraying device when spraying the room temperature curable resin composition onto the structure is 140 br or higher. 4. The room temperature curable resin composition, wherein a composition having a gelling time of 5 to 30 seconds at room temperature is used, and the composition is spray-cured at a spray pressure of 140 br or more to cure the structure. How to paint.