JPH04320500A - vehicle glass cleaning liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning fluid that can easily remove oil films adhering to vehicle glass, and more particularly to a cleaning fluid containing a swellable silicate that is used by being added to a washer fluid tank.

0002

[Prior art] Vehicle window glass, fender mirrors, etc.
When driving or parking, dust, oil smoke, exhaust gas,
Vehicle windows and fender mirrors are constantly contaminated by tar and pitch from the road surface, oils, waxes, silicone resins used in car maintenance, sewage during rainy weather, soot from factories, etc. Visibility is significantly reduced, which impairs safe driving and is extremely dangerous. In particular, water droplets are likely to form on the outside surfaces of window glass and fender mirrors that are contaminated with oil and fat during rainy days.
Even if you operate wipers to remove water droplets, it is not possible to reliably remove water-repellent contaminants that are firmly attached to the glass surface, and the light from the headlights of oncoming cars, signal lights, or the taillights of the driver in front of you cannot be removed. There are problems in that the light is diffusely reflected by water droplets, impairing visibility and impeding safe driving.

[0003] Most of the oil film removers commercially available in the past have been applied to and removed from vehicle window glass when the vehicle is stopped.

[0004] Also, as a vehicle glass cleaning liquid that is filled into the washer fluid tank of a car and used to remove an oil film while the car is running using a wiper, those containing surfactants as the main component are widely used. However, although this type of cleaning solution can remove mud and light oily stains, it cannot remove the stubborn oil film that adheres to the surface of the window glass. Additionally, cleaning solutions containing abrasives such as calcium carbonate, cerium, and alumina powder are also known, but when window glass is cleaned using a cleaning solution containing such abrasives, the glass surface is scraped off by the abrasives. This has the disadvantage that the resulting recesses are more likely to become clogged with oil film.

[0005]

[Means for Solving the Problems] The present inventors added a swellable silicate and a surfactant to a wash liquid tank and sprayed the mixture onto a window glass, thereby removing a firmly adhered oil film. I found out that it can be done. This is because oil film components are adsorbed between the layers of swollen silicate and removed.

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

[0007] Swellable silicates are phyllosilicates that have 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 have a high cation exchange ability. It is a clay mineral that exhibits the unique property of absorbing water between its layers and swelling. In nature, divalent aluminum containing trivalent aluminum in the octahedral layer
- Montmorillonite and beidellite, which are octahedral smectites, and hectorite and saponite, which are tri-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 is commercialized. but,
Unpurified natural products have large variations in chemical composition, structure, impurities, etc., so when dispersed in water, they may form precipitates or have low transparency. It is not suitable as a raw material for the present invention. In addition, synthetic swellable silicates are produced industrially, and these synthetic smectites do not produce precipitates even when dispersed in water, have high thixotropy, and have excellent transparency of the dispersion. Since it is expensive, it is preferably used.

Swellable silicates that can be used in the cleaning solution of the present invention include those purified from the aforementioned natural products such as montmorillonite, beidellite, hectorite, and saponite, as well as synthetic smectite (manufactured by our company) and laponite (Japan Silica). Examples include synthetic swellable silicates such as those manufactured by Kogyo Co., Ltd. The blending ratio of these swelling silicates is 0
．． It is preferable to mix it in a range of 1 to 10.0% by weight.

These aqueous dispersions of swellable silicates are viscous gel-like liquids with thixotropic properties, and because they swell by adsorbing water between layers, they are stable and can be stored for long periods of time. There is no sedimentation and separation, and the transparency is 9.
It is high at 5% or more, and has characteristics such as not decreasing viscosity even when the liquid temperature rises.

[0011] Various ions, molecules, and compounds are adsorbed between the layers of crystals having a layered structure through van der Waals bonds and hydrogen bonds, and generally, the larger the surface area, the greater the adsorption capacity. When swellable silicate crystals are dispersed in water and swollen, the swellable silicate crystals expand approximately 20 times as much as before swelling, and the surface area also increases.

[0012] Since the swellable silicate is a clay mineral,
It does not burn or decompose to produce toxic gases, is harmless to humans and animals, does not cause any harm if it comes in contact with the eyes or skin, and is odorless. Furthermore, since the swellable silicate is inorganic, there is no need to worry about it rotting.

[0013] As the surfactant used in the present invention, anionic surfactants and nonionic surfactants may be used alone or in mixtures thereof. Examples of anionic surfactants include metal salts or amine salts of fatty acids; alkylbenzene sulfonates; alkyl sulfate ester salts;
Polyoxyethylene alkyl sulfate salts; fluorine-based anionic surfactants; dialkyl sulfosuccinate salts, etc.; examples of nonionic surfactants include polyoxyethylene alkyl ether; polyoxyethylene alkylaryl ether; polyoxyethylene Examples 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.

The cleaning liquid of the present invention preferably contains a monohydric alcohol and/or a polyhydric alcohol,
Lower monohydric alcohols such as methyl, ethyl, isopropyl alcohol; ethylene, propylene,
Dihydric alcohols such as diethylene, 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.

When the cleaning liquid of the present invention is used, for example, by adding it to a washer liquid tank and spraying it onto a window glass, the viscosity of the cleaning liquid to which a surfactant and alcohol are added is B type viscosity of 1. 0×102 ~1.0×103c
It is preferable to set the speed within the range of P (6 rpm). If the viscosity is less than 1.times.10@2, the solution is too fluid and viscosity cannot be obtained, and if the viscosity is greater than 1.0.times.10@3, there is a risk that the washer fluid will solidify in the washer fluid tank.

[0016] The cleaning method using the cleaning liquid of the present invention includes:
In addition to the method of adding cleaning liquid to the washer liquid tank mentioned above, spraying it on the window glass surface, and cleaning it with a wiper etc.
It can also be used by applying a cleaning solution to the glass surface and polishing it with a cloth, sponge, etc.

[0017]

[Example] In a 300ml beaker, 191ml of pure water,
Smectite (SWN manufactured by Co-op Chemical Co., Ltd.) 5.0
g, anionic surfactant (Nissan Apanel S-7
0) 4.0g Further, 2.0ml of ethylene glycol was added and the mixture was heated to a water temperature of 70°C, and stirred for 10 minutes at 3000 rpm 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-based cleaning agent), commercially available product B (alumina powder-based cleaning agent), and commercially available product C (zirconia-based cleaning agent) were used. The oil film removability and the effect on the car body paint film were tested using the following test method, and the test results are shown in Table 1.

(1) Oil Film Removal Twelve pieces of vehicle window glass cut into a size of 100 x 50 x 2 mm were prepared. Carnauba wax (commercially available product) was applied to a cloth, and the glass surface was polished with this cloth, and a thin oil film was formed on the glass, which was used as a test piece. 3g of various cleaning liquids
After dropping each on three glass surfaces, they were rubbed with a commercially available wiper rubber, and the number of times until no water droplets were formed was recorded. Double mark if the number of times is 20 or less, ○ if it is 100 times or less, × if it cannot be removed even after 100 times.
It was judged as.

(2) Effect on the paint film of the car body A punched side plate of a passenger car body (size 50 x 100 x 1.5 m)
m) Five sheets were used as test plates. 150 ml of each type of cleaning solution was placed in a 200 ml beaker, and the test plate was immersed therein and left for 180 days. Thereafter, the test board was dried for one day at room temperature, and then the color and condition of the coating film on the test board and the change in the color of the cleaning solution were visually observed. A case where there was no change in the coating film was rated as ○, and a case where the coating film was discolored or damaged was rated as ×. Further, cases in which there was no change in the color of the cleaning liquid were judged as ○, and cases in which the coating film was eluted or discolored in the washing liquid were judged as ×.

[0021]

[Table 1]

[0022] As can be seen from Table 1, the cleaning liquid of the present invention has excellent oil film removal properties, and also shows that there is no fear of damaging the paint film on the vehicle body.

[0023]

[Effects of the Invention] By adding the cleaning agent of the present invention to the washer fluid tank of a vehicle, it has become possible to remove a strong oil film adhering to the window glass of a vehicle. In the cleaning liquid of the present invention, oil film components are adsorbed between the layers of the swollen silicate and removed.

[0024] Since the cleaning liquid of the present invention has a transparency of 95% or more, it does not obstruct visibility even when sprayed on window glass, nor does it cause sedimentation and precipitation of crystals, so even when using a wiper. There is no need to worry about the window glass being damaged.

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

Furthermore, the cleaning liquid of the present invention has thixotropic properties, that is, the property that the viscosity decreases when it is given fluidity, so when it is sprayed from the washer fluid tank through the nozzle, it has good fluidity and the nozzle There is no need to worry about getting stuck.

Furthermore, since the swellable silicate is weakly alkaline, there is no risk that the cleaning liquid will damage the paint or metal of the vehicle.

Claims (1)

[Claims] 1. A vehicle glass cleaning liquid characterized by containing a swelling silicate and a surfactant.