JPH0669899B2 - Water repellent for automobile window glass - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water repellent agent for automobile window glass. More specifically, the present invention removes a non-uniform water film on a window glass of an automobile which distorts the field of view when it is raining, so that the glass surface is made water repellent to prevent wetting, thereby ensuring a clear field of view. The present invention relates to a water repellent agent for automobile window glass.

[0002]

2. Description of the Related Art Conventionally, in order to suppress glare caused by an oil film formed on a window glass of an automobile in rainy weather, a wiper mainly composed of a surfactant or the like is used together to form a uniform thin water film. Was secured (hereinafter referred to as the existing hydrophilic type). On the other hand,
By treating the surface of the window glass with water repellency in advance, there is a method that prevents the glass from getting wet in rainy weather and ensures the visibility by a method that allows rainwater to easily flow off the glass surface (hereinafter, existing water repellency). Type).
As a representative example of the existing water-repellent type, Japanese Patent Publication Sho-50-15
473, which is treated with a composition containing an acid and an alkyl polysiloxane.

[0003]

The existing hydrophilic type has the following drawbacks. (B) During rainy weather, the water pressure on the window glass is distorted due to wind pressure, and the visibility cannot be secured. (B) Especially when driving at high speed in heavy rain, even if a wiper is used, it will not be in time, and a thick and distorted water film will not provide visibility, so safe driving cannot be ensured. (C) In the case of using a surfactant as a main component, the components are immediately washed away by the falling rain, and the effect disappears in a short time.

The existing water-repellent type excluding the above-mentioned drawbacks of the hydrophilic type has the following drawbacks. (D) It is necessary to manually treat the glass surface when it is not raining, which is complicated and cannot be treated on the spot during rainfall. (E) The type that requires heat curing cannot be processed under more normal use conditions. The present invention eliminates such drawbacks and does not require a troublesome pretreatment, and gives a relatively long-lasting water-repellent effect to a windshield glass surface of an automobile only by spraying or applying it on the spot in the rain. The present invention provides a new water repellent agent for window glass of automobiles and a method for treating the same, which secures the visibility.

[0005]

Means for Solving the Problems A mixture of an amino-modified silicone oil and one or more kinds of surfactants, particularly preferably a cationic surfactant, in water and / or a water-soluble organic solvent is rained or washed. Provided is a water repellent agent which can easily make a glass surface water repellent by adhering it to a window glass of an automobile at the time of, for example.

The amino-modified silicone oil according to the present invention is an alkylpolysiloxane in which an amino group is introduced into the side chain or main chain terminal, and is VP1652, VP1653, VP1 of Wacker Chemicals East Asia Co., Ltd.
654, VP1658, Fluid L655, Flu
Products such as id L656 and Fluid L657 are commercially available.

As the water-soluble organic solvent, monohydric or polyhydric alcohols such as methanol, ethanol, 2-propanol, ethylene glycol, propylene glycol and glycerin, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 1-methoxy-2
-Propanol, 1-ethoxy-2 propanol, 2-
Glycol ethers such as (2-ethoxyethoxy) ethanol, triethanolamine, 2- (dimethylamino) ethanol, alkanolamines such as 2- (diethylamino) ethanol, and others, ketones, ethers, amines, fatty acids, etc. Any mixture may be used as long as it is mixed with water at a relatively arbitrary ratio, and several kinds may be used together.

Examples of the surfactant include cationic, anionic, nonionic and amphoteric surfactants, all of which have a certain effect. In particular, cationic surfactants such as octadecylamine acetate, alkyltrimethylammonium chloride, Something like polyoxyethylene alkyl amine, alkyl dimethyl benzyl ammonium chloride gives better water repellency and durability.

The content ratio of the amino-modified silicone oil and the surfactant may be arbitrary. As a mixture of the above, P of Wacker Chemicals East Asia Co., Ltd.
A product such as 3301 is commercially available.

[0010]

Since the amino-modified silicone oil itself is generally an oil insoluble in water, even if it is applied to the surface of a window glass of an automobile as it is, it will only form an oil film and cannot obtain good water repellency. Therefore, by adding one or more kinds of surfactants to amino-modified silicone oil in water and / or a water-soluble organic solvent, they are evenly adsorbed on the glass surface while adhering to the water droplets adhering to the glass surface. At the moment of, a relatively long-lasting water-repellent effect can be given to the glass surface.

Although this mechanism has not been clarified, it is presumed as follows. The lipophilic group of the surfactant is oriented in the amino-modified silicone oil, and the hydrophilic group is adsorbed on the glass surface while conforming to the water droplets adhering to the glass surface. At this time, since the methyl group, which is a hydrophobic group of the amino-modified silicone oil, faces the surface, a durable water-repellent effect can be easily obtained. Among them, when a cationic surfactant is used as the surfactant, the cationization part ionically adsorbs on the negatively charged glass or the oil film surface to prevent the components from flowing down, further improving the water repellency and durability. Is obtained.

In addition to the above purpose, the water-soluble organic solvent and the surfactant also have the function of cleaning the window glass surface so that a uniform water-repellent film can be obtained.

It is also possible to use the water repellent agent by spraying or coating it on the surface of the window glass of an automobile not only during rain but also during car washing. In this case also, since no spreading or wiping is necessary, the work can be performed very easily.

[0014]

[Examples] A formulation example in which 5 g of P3301 (manufactured by Wacker Chemicals East Asia Co., Ltd.) was added to 95 g of water,
The existing hydrophilic type commercial item A and the existing water repellent type commercial item B were compared as follows.

The windshield of a car is divided into two parts vertically.
The surface of the glass was treated with half each of this formulation example and the commercial product A. Similarly, another vehicle was treated with the present formulation example and the commercial product B by half, respectively, and another vehicle was similarly treated with the commercial product A and the commercial product B by half. As a treatment method, this formulation example and the commercially available product A were sprayed directly on the windshield surface at the time of rainfall and were naturally washed away by rainwater. Commercial product B
When it was not raining in advance, oil stains and the like on the surface of the windshield were removed and dried, and then liquid B was applied to the tissue and spread on the glass surface. The processing workability at this time was compared.

Next, the automobile treated as described above was driven at high speed during heavy rain to compare the visibility and the sustainability.
The results are shown in Table 1.

[0017]

[Table 1]

The evaluation criteria are as follows. Workability: The one that does not take time and effort to process is marked with ○, and the one that does not require it is marked with x. Securing the field of view: When the outside can be seen clearly from the inside of the vehicle when driving at high speeds, the ones that are not clearly visible are marked with X, and the ones that can be secured with the combined use of wipers are marked with Δ. Sustainability: The one that can maintain the performance immediately after the treatment for 2 hours or more is ◯, and the one that the effect disappears within 1 hour is x.

As can be seen from Table 1, the compounding examples according to the present invention gave good results for all evaluation items, but the commercial product A gave poor results in terms of visibility and sustainability, and the commercial product B Has poor workability.

[0020]

The water-repellent agent according to the present invention does not require a troublesome pretreatment, and is applied on the windshield glass surface of an automobile on the spot during rain, sprayed with a hand sprayer, or sprayed with an aerosol. Therefore, it is possible to obtain very good workability. Furthermore, an excellent effect can be obtained in securing a clear field of view and its sustainability.

Claims (3)

[Claims] 1. A water repellent agent for automobile window glass, which comprises an amino-modified silicone oil and at least one surfactant in water and / or a water-soluble organic solvent. 2. The water repellent agent for automobile window glass according to claim 1, wherein the surfactant of claim 1 contains a cationic surfactant. 3. The water repellent agent is sprayed or applied on the surface of a window glass of an automobile, and the water repellent agent attached to the glass surface is allowed to flow down naturally or to be washed away with water such as rain water or tap water. Water repellent treatment method for windu glass surface of automobiles.