JPS6227856B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention makes it possible for the first time to spray coat ultra-high viscosity materials, which was previously considered impossible.

Spraying has been known as a method of spraying low-viscosity or high-viscosity liquids with high fluidity.This method allows for relatively easy and good-quality painting, but the viscosity In extreme cases, ultra-high viscosity materials of about 100,000 cps or more will become putty-like or sticky-like, so they cannot be applied using the above spraying method, so they are often applied using a trowel or roller. Although this method requires time and skill, there are many problems with the finish.

In addition, even if it is an ultra-high viscosity substance, such as a two-component reactive resin waterproofing material, it is not possible to directly spray the ultra-high viscosity substance as described above, so each of the above liquids must be prepared separately and a solvent or plasticizer added. Some products use a large amount of paint to make the viscosity low, and then mix it with the tip of a spray gun and spray it while still at a low viscosity, allowing it to harden on the surface within a few minutes. Even if spraying is possible, it is difficult to achieve high physical properties after curing due to the curing method described above, and furthermore, the transfer of solvent from the applied waterproof layer is unavoidable, which deteriorates the applied layer and makes it difficult to achieve high performance. It is not possible to create a good waterproof layer.

In the present invention, an ultra-high viscosity material is physically deformed into a thin plate shape, and a pressurized fluid is applied to this thin plate to break it and destroy it, simultaneously turning it into fine particles (mist) and releasing the pressurized fluid. It is applied by spraying with the flow. As a result, even ultra-high viscosity substances can be sprayed, the operation is simple and highly efficient, and the coated surface is uniform, even, durable, and clean.

Ultra-high viscosity materials are such that conventional spraying methods cannot be used, and typically have a viscosity of over 100,000 cps, and also apply to materials with viscosities of 200,000 cps, 300,000 cps, and more. These highly viscous materials can be made into thin plates using an appropriate method such as rollers, but it is usually more efficient to form a highly viscous material into a thin plate by placing it in a narrowly spaced channel and forcibly feeding it. be.
Compressed air, steam, liquid,
By squeezing liquid, powder dispersed in gas, or other pressurized fluids and hitting them concentratedly in a narrow area, even ultra-high viscosity fluids can be efficiently turned into mist, and can be applied to thin plates one after another. Continuous spraying can be achieved by continuously supplying pressurized fluid to the front surface of the jet hole. Further, as will be described below, the apparatus for performing such spraying can be made compact like a spray gun, and can be easily sprayed to any location.

An example of the device of the present invention will be described with reference to the drawings. It uses air as the pressurized fluid. An air shaft 1 is located in the center, and an air nozzle 3 having a jet hole 2 in the center is installed at the tip of the air shaft 1. It is fixed with a set ring 4, and an air socket 5 is attached to the other end. Compressed air supplied from an air compressor or the like passes through the air shaft 1 from the air socket 5 and is ejected from the ejection hole 2 of the air nozzle 3. The air shaft 1 is attached to a gun holder 6, and a gun shaft 7 is fixed to this gun holder. A nozzle adjuster 8 is attached to the tip of the gunshaft 7, an adjuster string 9 is attached to the rear end, and a nozzle cap 10 having a large central opening is fixed to the tip by screws. A nozzle plate 12 having a nozzle hole 11 in the center is removably attached by a nozzle adjuster 8 and a nozzle cap 10. A narrow gap 13 is formed between the rear surface of the nozzle plate 12 and the front surface of the air nozzle 3, and this gap 13 can be adjusted to an appropriate distance by mutually moving the nozzle adjuster 8 or the air nozzle 3. can. As shown in Fig. 2, this nozzle plate 12 has a thickness of 0.5 to 2 mm, and a nozzle hole diameter of 2 mm.
A variety of air nozzles with diameters of ~5 mm and different shapes are available, and air nozzles 3 are also available with a diameter of 2 mm.
A variety of nozzle plates having a thickness of 4 mm to 4 mm are prepared, and the two are appropriately selected and combined depending on the difference in viscosity. Generally, when the viscosity is high, a thick nozzle plate is used. In the one shown in FIG. 1, the nozzle holes 11 of the nozzle plate 12 are slightly larger than the ejection holes 2 of the air nozzles 3. The above gun holder 6 has 2
There are two inlets 14, one or both of which are used as appropriate, but the one shown has a stopper 15 on one side and a socket (not shown) on the other from which the spraying material is supplied under pressure. Ru. The material supplied from the gear pump or other pressure feeding device is forced to pass through the material supply path 16 made by the inner cylinder formed by the air shaft etc. and the outer cylinder formed by the gun shaft 7 etc. from the inlet of the gun holder,
The tip part hits the nozzle plate 12,
Due to the pressure of the spraying material itself, it is deformed into a thin plate shape in this zone as it passes through the gap 13, and is supplied to the front surface of the nozzle 2 of the air nozzle 3 across it, so that it passes through the air shaft and passes through the nozzle. The thin plate is destroyed when it comes into contact with the pressurized air that is ejected from the material and becomes a mist, which is then sprayed on the pressurized air.The spray material that is being pressurized is supplied one after another to the front of the nozzle hole 2, so it is continuously sprayed. It will be done. In addition to compressed air,
Pressurized fluids, such as steam as described above, may similarly be used in accordance with the above. In addition, the spraying material is supplied under pressure from the center, and is stretched out into a thin plate shape toward the outer periphery.
It is also possible to spray pressurized fluid ejected from holes opened at the outer periphery onto this to create a mist.

Examples are shown below.

Example The painted surface was a vertical wall made of reinforced concrete (RC body). As a pretreatment, an epoxy liquid resin, Panecoat Primer #60 (manufactured by Shin Toyo Gosei Co., Ltd.) is sprayed at a rate of 0.3 kg/m ² using a mortar gun. This material serves to improve the adhesion between the painted surface and the sprayed material and to prepare the base. After drying the primer, we began the process of spraying a highly viscous waterproofing material. The waterproofing agent is urethane waterproofing material, Panecoat U-500Ts (manufactured by the same company).
Spray at a rate of 2.4Kg/ ^m2 . Panecoat U-
500Ts consists of two liquids: a base resin and a curing agent.The base resin has a viscosity of 300,000 cps (20℃) and an isocyanate group content.
It is a 3.5% urethane resin prepolymer and has thixotropic viscosity. Hardener has a viscosity of 100000cps
(at 20°C), the main component is polyoxypropylene diol, which also contains carbon black, a catalyst, and other fillers. Stir and mix 21 kg of the base resin and curing agent so that the weight ratio is 1:2. The viscosity after 5 minutes after starting stirring is approx.
The temperature is 100,000 cps/20℃, and this is put into the supply tank (hopper) (Figure 3). The spray material that has entered the hopper passes through the hopper and is controlled by the pump to the blowing pressure.
Adjust it to 15-20Kg/cm ² and immediately send it to the above gun from the adapter. Gap 1 of the material supply path
3 was set to about 1 mm, and the waterproofing material was supplied to the front of the nozzle 2 in the form of a thin plate of about 1 mm. When the air compressed by the air compressor is passed through the air compressor, air filter, and check valve, and the air is supplied to the air shaft 1 through the adapter from the discharge air outlet, and the air is ejected from the air nozzle's ejection hole at a high pressure of 7 kg/cm ² or more. The waterproofing material was sprayed in the form of a mist at a flow rate of 5.9 kg/min and applied to the wall surface. Since it took about 4 to 7 minutes to spray one batch, during this time the waterproofing material to be sprayed next was mixed and sprayed one after another. The applied waterproof layer had a uniform thickness of approximately 2 mm, and its surface was smooth and no slump was observed. The sprayed product reacted and hardened over time, forming a tack-free coating after one day and exhibiting its original physical properties in about one week, making it an excellent waterproof coating for concrete. Its physical property values are as follows.

Tensile strength 45Kg/ ^cm2 Elongation 1150% Tear strength 20Kg/cm Hardness 30~55 (according to JIS K 6301) In addition to the above, for materials with a material viscosity of 200000cps,
Set the blowing pressure of the material to about 20 to 30Kg/ ^cm2 , and
If a thin plate with a thickness of 0.75 mm was used, spraying could be performed in the same manner at a flow rate of about 5 kg/min. In addition, for materials with a viscosity of 300,000 cps, the blowing pressure should be adjusted to 30 to 35
By using a thin plate of about 0.5 mm thick and using a coating of about Kg/cm ² , spraying could be carried out in the same manner at a flow rate of about 4 Kg/min. The surfaces of all coating layers were smooth and of good quality.

Furthermore, according to this device, it is also possible to spray low-viscosity materials of approximately 100,000 cps or less.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, with FIG. 1 being a sectional view, FIGS. 2 a to 2 f being sectional views of various nozzle plates, and FIG. 3 being a flow sheet.

Claims (1)

[Claims] 1. An ultra-high viscosity substance is supplied in front of a pressurized fluid ejection hole in a thin plate shape so as to cross the pressurized fluid, and small zones are placed at appropriate positions on the thin plate body. is set, the circumference of the small zone is regulated from both sides, and the pressurized fluid is directed toward the small zone, and the thin plate-shaped body of the small zone is smashed and destroyed, instantaneously turning into mist. A method of spraying an ultra-high viscosity substance onto the object to be coated. 2. The ultra-high viscosity material has a viscosity of about 100,000 cps or more, and the ultra-high viscosity material according to claim 1 is deformed into a thin plate shape with a thickness of about 1 mm or less. Method. 3. A material supply path for supplying an ultra-high viscosity substance, a thin plate forming zone having a narrow gap for deforming the ultra-high viscosity substance into a thin plate shape in the material supply path, and the thin plate forming zone A spraying device for ultra-high viscosity material, which includes a hole penetrating through the hole, a pressurized fluid jet hole located behind the hole, and a fluid pressure feed pipe connected to the jet hole. 4. According to claim 3, the thin plate forming zone is formed to surround the hole so as to supply a thin plate-like material of ultra-high viscosity to the hole passing through the zone from around the hole. Spraying equipment for ultra-high viscosity substances.