JPH01218944A - Composite for high pressure injecting car washer machine - Google Patents

Abstract

PURPOSE:To remove a thin film stain preventing a paint surface from flawing by mixing a fine dust of specific Moh's hardness, specific gravity and grain size in water or a surface active agent water solution used for a high pressure injecting car washing machine. CONSTITUTION:A fine dust, having about 1 Moh's hardness, 1.6 or less specific gravity and 5-30microns grain size, is mixed in water or a surface active agent water solution for washing a car body using a high pressure injecting car washing machine. An upper layer of stain and a thin film by a stain of small grains under a bottom layer part of large grains, so-called maximum one film can be effectively removed preventing a coating surface from flawing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composition for use in a high-pressure injection car wash machine for washing the bodies of automobiles installed at service stations such as gas stations, for example.

[Prior Art] Dirt on the surface of an automobile body is caused by fine particles of earth and sand, fine concrete powder, fine tire wear particles, etc. adhering to the painted surface or wax layer of the car body, and these are also caused by oil in the atmosphere from automobile exhaust, etc. The dirt on the car body surface, which is intertwined and formed in layers due to exposure to wind, rain, and sunlight (see Figure 1), can be removed by rubbing it with your fingertips or with a brush, rag, rag, etc. Even if water or detergent such as a surfactant is sprayed under pressure, the upper layer of dirt and dirt with large particles can be removed, but the thin M (second layer) caused by dirt with small particles in the lower layer
(see figure) cannot be removed.

In addition, this remaining thin film of dirt cannot be removed by pressurized injection using a normal high-pressure pump; removing it with injection pressure requires ultra-high pressure that can destroy the surface of the car body, making it unsuitable for car washing. However, the dirt on this thin film can be easily removed by lightly rubbing it with a fingertip, a brush, a rag, a rag, etc.

In the industry, this thin film of dirt that cannot be removed by pressurized spraying of water or a detergent such as a surfactant is referred to as the "last film." The "last film" is caused by liquid bridges caused by intermolecular forces between each of the fine particles that make up dirt and between each fine particle and the surface of the car body, and the surface tension of the water that exists between each fine particle. This "last part" is quite firmly attached to the surface of the car body due to electrostatic force, and although it varies depending on the driving environment of the car and the weather, it can be formed after just a few days of driving, for example. There is. In Japan, where road traffic is congested, there is a particular need for car washes that target this "last part."

Even if water or a detergent such as a surfactant is sprayed under pressure using a high-pressure pump, the "last part" cannot be removed because the sprayed liquid is sprayed onto the car wash surface at a constant rate independent of the flowing part of the liquid. A thick water film (static film) is formed, and this
Since the sprayed liquid does not reach the inside of the static film, dirt caused by fine particles smaller than the thickness of the static film will be removed by the static film.
(See Figure 1).

After spraying the liquid, it can be easily removed by lightly rubbing it with your fingertips, brush, rag, rag, etc.
This is because the liquid bridge and electrostatic force of the forces that attach the last part to the car body disappear because it is wet with liquid, leaving only intermolecular forces.

Therefore, the currently used car wash machines that remove the "last part" are the ones used in coin-operated car washes that spray detergent such as water or surfactants under pressure and then manually clean the surface of the car with a rag or the like. There are spray car wash machines that scrub and remove dirt along with water, gate-type car wash machines that use rotating brushes, and chemical car wash machines that use strong alkaline, strong alkaline, and strong acid detergents.

However, all of these car wash machines have the following problems.

Spray car wash machines use rags to scrub the surface of the car, which can damage the surface of the car. Further, since it requires manpower, washing the car becomes troublesome.

Gate type car wash machines that use brushes can damage the surface of the car body due to some of the dirt on the car body surface, part of the dirt attached to the brushes, and the tips of the brushes, resulting in so-called brush marks on the painted surface.These brush marks are black. , for cars with colored paint such as red or blue! 1lrI Because it stands out, it is disliked by drivers. If you wash your car with only water and detergent without brush marks because you don't want to get brush marks, the "last part" of dirt may remain, and the brush may scratch protrusions such as antennas and mirrors. It may break.

Chemical car wash machines use strong alkaline and acidic chemicals, which cause problems such as discoloration and deterioration of the paint, corrosion of various metal parts, and wastewater treatment.

In addition to the "& back part" dirt on the surface of a car's body, there are dirt that has deteriorated the surface of the painted surface or wax layer, and dirt that has seeped into the pores of the paint film, i.e. "water scale". There is a stain called. Although this "water scale" varies depending on the driving environment of the automobile, the weather, etc., it generally forms noticeably in 2 to 4 months, especially on the surface of the car body painted white. As a machine for removing this "water scale", there is a car washing machine using rotating brushes and abrasives, a car washing machine using strong alkaline and strong acidic detergents, and JP-A-61
A car wash machine proposed in Japanese Patent No. 190599, in which a natural abrasive is mixed with liquid and sprayed thereon, has been implemented or is being considered. All of these methods achieve their goals by first removing the wax layer on the car body surface and then destroying the painted surface, but they are also somewhat effective at removing water stains.

However, these "water scale" car wash machines have different purposes from the "last part" removal which is the objective of the present invention. Considering the actual state of dirt, the objective of the present invention, the removal of the final -r!Aj, is the most practical and highly demanded need for car washing.

[Object of the Invention] An object of the present invention is to provide a composition for a high-pressure injection car wash machine that effectively removes the "last part" of an automobile without damaging the surface of the car body.

[Structure of the Invention] According to the present invention, there is provided a cleaning composition to be mixed into water or an aqueous surfactant solution for cleaning a car body using a high-pressure injection car wash machine, wherein the cleaning composition has a Mohs hardness. Provided is a composition for a high-pressure spray car wash machine, characterized in that it is a fine powder with a specific gravity of about 1, a specific gravity of 1.6 or less, and a particle size of 5 to 30 microns.

[Operations and Effects of the Invention] Therefore, the Mohs hardness of the fine powder is around 1, and the specific gravity is 1.
．． 6 or less, so when cleaning with a cleaning solution mixed with the fine powder, you can spray it with strong discharge pressure, bring the spray nozzle close to a heavily contaminated area on the painted surface, and even if you spray the same spot for a long time, the painted surface will not be damaged. It can remove dirt without causing any damage and effectively remove the "last film". In addition, the operation of the washing machine can be stabilized without causing the spray nozzle to become skewered. In addition, among the fine powders used, if the specific gravity is less than 1, it will float in the washing wastewater and can be easily separated from dirt substances, and can be recovered and reused. Although it settles, only the fine powder can be separated by flotation and reused.

[Preferred implementation by Mr. S] When carrying out the present invention, it is preferable to use, for example, the apparatus proposed by the present applicant in Japanese Patent Application No. 62-50157 for mixing the fine powder.

In carrying out the present invention, the higher the discharge pressure is within the practical range of 30 kg/* or more, the better, and the powder concentration is preferably in the range of 1 to 5% at the nozzle exit.

In carrying out the present invention, the fine powder may include thermoplastics, such as polyethylene, which is a fine powder of man-made substances.
Vinyl chloride, chlorinated vinyl chloride, chlorinated polypropylene, chlorinated polyethylene, chlorinated rubber, methacrylate, and wheat flour, which is a fine powder of natural substances, can be suitably used.

In practicing the invention, it is preferred to incorporate wax into the cleaning solution. In this way, wax application can be performed at the same time as cleaning.

[Example] Dirt from an actual running car is 9 with a Mohs hardness of around 1 and a specific gravity of 1.6 or less.
Cleaning liquid mixed with fine powder of type 18 properties, injection conditions: 1, injection pressure 7Qkg/cri 2, nozzle movement speed 0 (do not move) 3, injection liquid volume 104/mln (1, OQ/-...this (corresponds to 400 times the following “last film” removal test) 4. Powder concentration 1.0
Wt% 5. Surfactant concentration Q. The results of testing the degree of scratching at 2wt% are shown as ◎ No scratches or slight ○ Slight scratches. Injection conditions: 1. Injection pressure 70kg/cJ 2. Nozzle movement Speed 4m/m1n3, injection liquid amount 10! /m1n (0,00254/cd...This is around 10 ba, 2
(50g is enough to wash one car) 4. Powder concentration: 1.0wt% 5o Surfactant concentration: 0.2wt% The results of testing the degree of removal of one film after RFK were ◎ Completely destroyed. ○ There is a faint residue 8 There is a noticeable residue × Figure 3 shows that there is more residue than △.

As can be seen from Figure 3, in the scratch level test, among test Nos. 1 to 18, Nos. 12, 13, and 14 were O.
Except for the above, all the scratches are ◎ and there are no scratches or only slight scratches, which is extremely good.

This is probably because the specific gravity of No-12, 13, 14, and 18 is relatively large, and the collision energy of the fine powders is larger than that of other fine powders. However, the test method was conducted under conditions that were more severe than those used in normal car washes, making it practical for use as a spray car wash machine.

On the other hand, for "last film" removal, the particle size is Δ or × for particles less than 5μ and greater than 40μ, and from 7μ to 25μ.
Between μ, it is ◎ or O. This is thought to be because the collision energy is small at 5μ and the static film of water cannot be completely broken.

However, even if the particle size is 5 μm, it can be put into practical use as a spray car wash machine, since it is sufficient to increase the concentration of the mixed powder. Further, if the thickness is 40μ or more, the fine powder will only hit some places, leaving a patchy film. Also, because the particle size is large, the nozzle is easily clogged, making it difficult to use as a spray car wash machine.

As for the material, polyethylene (No. 1 to 6) is about 500
Although it is expensive at ¥/kg, it has a specific gravity of less than 1, so
It can be easily reused by flotation separation.

Vinyl chloride (Nos. 7 to 11) is relatively inexpensive at about 250 yen/kg, and is the best fine powder because it does not cause damage and has a particle size of 2o to 25μ, which allows it to fall easily.

Other powders (No. 12-16) are approximately 500 yen/
Although it is expensive (kg), -g works well (No.

17-18) - The film does not come off much, but it costs about 100 yen/
Since it is cheap (kg), it can be put into practical use by increasing the concentration of powder mixed in. In addition, polyethylene (No. 1 to 6
) has a specific gravity of 1 or more, so it settles with the dirt, but can be reused by the flotation method.

[Summary] As explained above, according to the present invention, fine powder having a particle size of 5 to 30 microns, a Mohs hardness of 1 or less, and a specific gravity of 1.6 or less is mixed into water or an aqueous surfactant solution, It sprays with strong discharge pressure to remove dirt without damaging the painted surface, and can effectively remove even the "last film". Furthermore, it is possible to stabilize the operation of the car wash machine by eliminating wear of the spray nozzle and clogging of the piping ports.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view showing dirt on a car body, Fig. 2 is a FR micrograph of the particle structure of a thin film caused by dirt in the lower layer, and Fig. 3 is a sectional view showing scratches and a "last" part showing an embodiment of the present invention. FIG. 2 is a diagram showing a table of test results for removing one film of 100% of the total amount of water. Photomicrograph of the last layer of engraving on the coarse particle surface Figure 3. Procedural amendment (method) % formula % 1. Indication of the incident Patent application No. 1983-44290 2. Title of the invention: High-pressure injection method Composition for Car Wash Machines 3, Relationship to the Amendment Case Applicant Address: 2-12-13 Shibaura, Minato-ku, Tokyo Name:
Tokyo Tatsuno Co., Ltd. Representative Hiromichi Tatsuno 4, Agent 105 Address 2-13-3-5 Nishi-Shinbashi, Minato-ku, Tokyo Date of amendment order 7 Contents of amendment (1) Figure 2 of the drawings Correct as shown in the attached drawing. 8. Attached list of M categories

Claims (1)

[Claims] A cleaning composition mixed into water or an aqueous surfactant solution for cleaning a car body using a high-pressure injection car wash machine, the cleaning composition having a Mohs hardness of around 1 and a specific gravity of 1.6.
A composition for a high-pressure spray car wash machine, characterized in that it is a fine powder with a particle size of 5 to 30 microns.