JPH0774357B2 - Vehicle glass cleaning liquid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning liquid which can easily remove an oil film attached to vehicle glass, and more particularly to a cleaning liquid containing a swelling silicate which is used by being added to a tank for a washer liquid.

[0002]

2. Description of the Related Art Vehicle window glass, fender mirrors, etc.
Dust, oil smoke, exhaust gas in the atmosphere when driving or parking
Tar and pitch from the road surface, oils and fats used when caring, wax, silicone resin, sewage in rainy weather, soot from the factory, etc. are constantly contaminated, vehicle window glass and fender mirrors thus contaminated, It is extremely dangerous because it causes the visibility to drop significantly and impairs safe driving. In particular, water drops are likely to occur on the outer surface of window glass contaminated with oils and fats, fender mirrors, etc.
Even if water droplets are removed by operating a wiper, even water-repellent contaminants firmly adhered to the glass surface cannot be reliably removed, and the light of headlights of oncoming vehicles, signal lights, or taillights of front runners. However, there is a problem that it causes diffuse reflection by water droplets, which deteriorates visibility and impedes safe driving.

Most of the oil film removing agents that have been commercially available in the past have been applied to the window glass of a vehicle to remove it when the vehicle is stopped.

Further, as a vehicle glass cleaning liquid of a type in which a tank for a washer liquid of an automobile is filled and an oil film is removed by using a wiper while traveling, a liquid containing a surfactant as a main component is widely used. However, this type of cleaning solution was able to remove mud and light oily stains, but could not remove the stubborn oil film adhered to the window glass surface. Cleaning solutions containing abrasives such as calcium carbonate, cerium, and alumina powders are also known, but when cleaning window glass with this type of abrasive-containing cleaning solution, the glass surface is scraped off by the abrasives. However, there is a drawback in that the oil film is more likely to be clogged in the concave portion caused by this.

[0005]

We have found that swellable silicates, surfactants , monohydric alcohols and / or polyhydric alcohols.
Add the alcohol to the wash liquid tank,
It was found that the oil film strongly adhered was removed by spraying on the window glass. This is because the oil film component is adsorbed and removed between the layers of the swollen silicate.

That is, the present invention is a vehicle glass cleaning liquid characterized by containing a swelling silicate and a surfactant.

The swelling silicate is a phyllosilicate having a sandwich type three-phase structure in which a magnesium octahedral layer or an aluminum octahedral layer is sandwiched between two silica tetrahedral layers, and has a cation exchange ability. It is a clay mineral that has the unique property of having swelling by incorporating water between layers. Naturally, the octahedral layer contains trivalent aluminum 2
-Montmorillonite and beidellite that are octahedral smectites, and hectorite and saponite that are 3-octahedral smectites containing divalent magnesium in the octahedral layer are known. These natural smectites have the property of incorporating water into their constituent molecules and swelling.

Among these natural smectites, only bentonite containing montmorillonite is produced on an industrial scale in Japan, and pure montmorillonite extracted from these montmorillonites has been commercialized. But,
Unrefined natural products have problems such as precipitation and low transparency when dispersed in water because of large fluctuations in chemical composition, structure, impurities, etc. It is not suitable as a raw material of the present invention. Further, synthetic swelling silicates are industrially produced, and these synthetic smectites do not produce a precipitate even when dispersed in water, high thixotropy is obtained, and the transparency of the dispersion is also Since it is expensive, it is preferably used.

Examples of the swelling silicate that can be used in the cleaning solution of the present invention include those purified from the above-mentioned natural products montmorillonite, beidellite, hectorite, saponite, synthetic smectite (manufactured by our company), and laponite (Nippon Silica). Examples thereof include synthetic swelling silicates manufactured by Kogyo Co., Ltd. The compounding ratio of these swelling silicates is preferably 0.1 to 10.0% by weight.

These aqueous dispersions of swelling silicates are viscous gel-like liquids having a thixotropic property, and are swelled by adsorbing water between layers, so that they are stable and can be stored for a long time. Does not settle and separate, and has a transparency of 9
It is as high as 5% or more, and has characteristics such that the viscosity does not decrease even if the liquid temperature rises.

Various ions, molecules, and compounds are adsorbed between layers of crystals having a layered structure by Van der Waals bonds or hydrogen bonds. Generally, the larger the surface area, the larger the adsorption capacity. The swelled swelling silicate crystals dispersed in water expand about 20 times as much as before swelling and the surface area also increases.

Since the swelling silicate is a clay mineral,
It neither burns nor decomposes to produce toxic gas, is harmless to humans and animals, does not cause any harm to the eyes and skin, and is odorless. In addition, since the swelling silicate is an inorganic substance, there is no fear of spoilage.

As the surfactant used in the present invention, an anionic surfactant, a nonionic surfactant, or a mixture thereof is used. Examples of the anionic surfactant include fatty acid metal salts or amine salts; alkylbenzene sulfonates; alkyl sulfate ester salts;
Polyoxyethylene alkyl sulfate ester salts; fluorine-based anionic surfactants; dialkyl sulfosuccinate salts and the like; nonionic surfactants include polyoxyethylene alkyl ethers; polyoxyethylene alkyl aryl ethers; polyoxyethylene Examples thereof include alkyl esters; polyoxyethylene sorbitan alkyl esters; pluronic nonionic surfactants; fluorine nonionic surfactants. The blending ratio of these surfactants is preferably in the range of 0.2 to 15.0% by weight.

[0014] cleaning solution of the present invention is blending a monohydric alcohol and / or polyhydric alcohols, for example methyl -, ethyl -, isopropyl - lower monohydric alcohols, such as alcohols, ethylene -, propylene -, diethylene -, Dihydric alcohols such as triethylene- and dipropylene-glycol; polyhydric alcohols such as glycerin and diglycerin. The blending ratio of these alcohols is preferably in the range of 0.5 to 20.0% by weight.

[0015] The cleaning solution of the present invention, for example, when added to the washer fluid tank used by spraying to the window glass, the viscosity of the cleaning liquid containing a surfactant and alcohol, the apparent viscosity with a B type viscometer Is 1.0 × 10 ^{2 to} 1.0
It is preferable to be in the range of × 10 ³ mPa · s (6 rpm ). When the viscosity is 1 × 10 ² or less, the solution is too fluid to obtain viscosity, and when the viscosity is 1.0 × 10 ³ or more, the washer liquid may be solidified in the washer liquid tank.

The cleaning method using the cleaning solution of the present invention includes:
In addition to the method of adding the cleaning liquid to the above washer liquid tank, spraying on the surface of the window glass and polishing with a wiper,
It is also possible to apply the cleaning liquid to the glass surface and use it with a cloth or sponge to polish the surface.

[0017]

Example: In a 300 ml beaker, 191 ml of pure water, 5.0 g of smectite (SWN manufactured by Cope Chemical Co., Ltd.),
Anionic surfactant (Nissan Apanel S-70)
4.0 g of ethylene glycol 2.0 ml was added,
What was heated to a water temperature of 70 ° C. was stirred at 3000 rpm for 10 minutes using a homogenizer (manufactured by Mitamura Riken) to prepare the cleaning liquid of the present invention.

As comparative examples, commercially available product A (cerium oxide type cleaning agent), commercial product B (alumina powder type cleaning agent) and commercial product C (zirconia type) were used. The oil film removability and the influence on the coating film of the vehicle body were tested by the following test methods, and the test results are shown in Table 1.

(1) Oil Film Removability Twelve pieces of vehicle window glass were cut into a size of 100 × 50 × 2 mm. A carnauba wax (commercially available product) was attached to a cloth, and the glass surface was polished with this cloth, and a thin oil film formed on the glass was used as a test piece. Various cleaning liquid 3g
Was dropped on each of the three glass surfaces and then rubbed with a commercially available rubber for a wiper, and the number of times until no water drops were generated was recorded. The number of times was 20 times or less was judged as double circle, 100 times or less as o, and x when 100 times could not be removed by rubbing.

(2) Influence on the coating film of the car body The side plate of the car body of a passenger car is punched out (size 50 × 1).
Five pieces (00 × 1.5 mm) were used as test plates. 150 ml of each cleaning solution was placed in a 200 ml beaker, and the test plate was immersed therein and left for 180 days. After that, the test plate was dried at room temperature for 1 day, and then the change in the color and state of the coating film of the test plate and the color of the cleaning liquid was visually observed. The case where there was no change in the coating film was marked with ◯, and the case where the coating film was discolored or damaged was marked with x. In addition, those in which the color of the cleaning liquid did not change were evaluated as ◯, and those in which the coating film was eluted or discolored in the cleaning liquid were evaluated as x.

[0021]

[Table 1]

As can be seen from Table 1, the cleaning liquid of the present invention has an excellent oil film removability, and also shows no fear of damaging the coating film of the vehicle body.

[0023]

By adding the cleaning agent of the present invention to the tank for the washer fluid of a vehicle, it becomes possible to remove a strong oil film adhering to the window glass of the vehicle. In the cleaning liquid of the present invention, the oil film component is adsorbed and removed between the swollen silicate layers.

Since the cleaning liquid of the present invention has a transparency of 95% or more, even if it is sprayed on a window glass, the visibility is not obstructed, and precipitation and separation do not cause precipitation of crystals and the like. There is no need to worry about damaging the window glass.

Further, even if the cleaning liquid of the present invention is sprayed from the washer liquid tank onto the window glass during high-speed running, the solution does not easily scatter because it is viscous, so there is no waste.

Further, since the cleaning liquid of the present invention has thixotropic property, that is, the viscosity becomes small when it is provided with fluidity, when it is sprayed from the washer fluid tank through the nozzle, the fluidity is improved, There is no need to worry about boring etc.

Further, since the swelling silicate is weakly alkaline, the cleaning liquid does not have a risk of coating the vehicle or damaging the metal.

Claims (1)

[Claims] 1. A vehicle glass cleaning liquid comprising a swelling silicate, a surfactant, and a monohydric alcohol and / or a polyhydric alcohol.