JP2007154023A - Oil film remover for automotive glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil film remover for automotive glass which can effectively wash and remove a strong oil film having, as the main component, an amino-modified silicone oil for water repellent car washing to be performed in an automatic car washing machine and can be suitably used in the film removal operation after washing a car. <P>SOLUTION: The oil film remover for automotive glass is obtained by incorporating acetic acid and a colloidal silica stable in an acetic acid acidic aqueous solution, and a surface active agent into water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil film removing agent for removing an oil film adhering to a window glass such as a windshield of an automobile. In particular, the present invention relates to an oil slick remover for automobile glass that can easily wash and remove an oil film generated on a window glass such as a windshield after a water-repellent car wash performed in an automatic car washer.

  In general, on a window glass of an automobile, a wax component applied to the car body of the automobile flows out to the window glass surface by rainwater, or an oil component such as exhaust gas adheres to form a so-called oil film. In recent years, so-called water-repellent car wash or coated car wash using an automatic car washer has been widely performed. The liquid agent used in these is an aqueous emulsion mainly composed of amino-modified silicone oil, which is diluted with water by several tens to several hundred times and applied by spraying.

  The amino-modified silicone oil adsorbs on the painted surface of the vehicle body, but adsorbs more firmly on the glass surface. In addition, after the amino-modified silicone oil is adsorbed, it is crosslinked on the glass surface with carbon dioxide gas and moisture in the air to form a stronger oil film.

  Currently, oil film removers or glass cleaners used after washing at a gas station generally contain a surfactant, a lower alcohol, a volatile amine, and the like. For example, it is disclosed in Patent Documents 1 and 2. Moreover, the neutral or alkaline glass cleaning agent which mix | blended colloidal silica is well-known, For example, it is disclosed by patent documents 3-6.

  Further, Patent Document 7 discloses an acidic glass cleaning composition mainly composed of an anionic surfactant, phosphoric acid and ethanolamine. Further, Patent Document 8 discloses a glass plate cleaning agent containing an abrasive (a glassy volcanic ejecta having a particle size of 5 to 90 μm), a surfactant, and an organic acid.

  Further, Patent Document 9 discloses a cleaning method using a cleaning liquid in which acetic acid and / or vinegar is added to a diluted solution of sodium laurylbenzenesulfonate. Patent Document 10 discloses a cleaning composition containing acetic acid, a fragrance (masking agent), and a surfactant.

Japanese Patent Laid-Open No. 62-257994 JP-A-11-269486 JP 54-96503 A Japanese Patent Laid-Open No. 55-7840 JP-A-60-96697 JP-A-8-302394 JP-A-2-28300 Japanese Patent Laid-Open No. 10-8089 JP-A-54-105108 Japanese Patent Laid-Open No. 2002-3886

  It is difficult to remove the oil film on the windshield or the hardened oil film after the so-called water-repellent car wash with the neutral or alkaline detergent. In addition, in the composition of the disclosed neutral or alkaline example containing colloidal silica, the detergency is improved as compared with the neutral or alkaline detergent not containing the colloidal silica, but the oil film after the water-repellent car wash is sufficient. It cannot be removed.

  Although an acidic cleaning agent may improve the cleaning power against an oil film as compared with a neutral or alkaline cleaning agent, the oil film after water-repellent washing cannot be sufficiently removed. In the case of the disclosed example in which an abrasive (glassy volcanic ejecta with a particle size of 5 to 90 μm) is blended with an acidic cleaning agent, the cleaning performance against the oil film is high, but there is a possibility of scratching the painted surface around the windshield during the cleaning operation There is a lot of wiping residue (white residue) of the abrasive after removing the oil film during work after the water-repellent car wash. It is not suitable as a cleaning agent to be used.

  Therefore, the object of the present invention is to effectively and easily remove a strong oil film mainly composed of amino-modified silicone oil such as a water-repellent car wash performed in an automatic car wash machine, and to remove oil film after car wash. An object of the present invention is to provide an oil film remover for automobile glass that can be suitably used.

The above object is achieved by the present invention described below. That is, the present invention provides an oil film remover for automobile glass, characterized in that acetic acid, colloidal silica that is stable in an acetic acid aqueous solution, and a surfactant are blended in water. In the oil film remover, the amount of acetic acid is such that the concentration is 0.2 to 3.0% by mass, and the amount of colloidal silica is 1.0 to 4. 4 in terms of anhydrous silicic acid (SiO ₂ ). The amount is such that the concentration is 0% by mass, the amount of the surfactant is such that the concentration is 0.01-0.1% by mass; and the particle size of the colloidal silica is 10-50 nm It is preferable.

  According to the present invention, not only a strong oil film mainly composed of amino-modified silicone oil after water-repellent washing by an automatic car washer, but also a wax component after wax washing by an automatic car washer or a manual treatment. The oil film due to the wax effluent can be easily removed. Therefore, by using the oil film removing agent of the present invention, it is possible to greatly reduce the oil film removing work at a gas station using an automatic car washer.

  Next, the present invention will be described in more detail with reference to the best mode for carrying out the invention. Acetic acid blended in the oil film remover of the present invention is an essential component of the present invention. Substances that impart acidity to oil film removers include inorganic acids such as hydrofluoric acid, hydrochloric acid, phosphoric acid, sulfuric acid, acetic acid, glycolic acid, lactic acid, oxalic acid, butyric acid, propionic acid, succinic acid, maleic acid, sulfamic acid, Organic acids such as formic acid, citric acid, tartaric acid and malic acid are conceivable.

  The conditions of the substance that imparts acidity to the oil film removing agent of the present invention are high safety to the human body, no impact on the environment, and adverse effects on materials such as glass, coating, and sealing agents. It is difficult to use, has volatility, does not remain on the cleaned glass surface, sealing agent, etc., has a high detergency against oil film, and is inexpensive. For these reasons, the present invention uses acetic acid as an acid. Selected.

  Acetic acid exhibits higher detergency than the other organic acids for the amino-modified silicone oil film. The reason is that amino-modified silicone oil used in water-repellent car wash is emulsified by neutralizing its amino group, and acetic acid is suitably used as the neutralizing agent. After the emulsion is adsorbed on the painted surface or glass surface, it is estimated that the neutralizing agent in the emulsion returns to the original amino-modified silicone oil even if it volatilizes, and this amino-modified silicone oil is converted into acetic acid in the oil film remover. Is considered to be due to the action of re-emulsification or dispersion. The blending amount of acetic acid in the oil film remover of the present invention is not particularly limited, but it is 0.2 to 3.0% by mass (hereinafter referred to as “% by mass”) in the oil film remover at the use concentration, preferably 0.4. What is necessary is just to mix | blend so that it may become a density of -1.0%. When the blending amount is less than 0.2%, the detergency of the obtained oil film remover is weak, while even when the acetic acid compounding amount exceeds 3.0%, the obtained oil film removing agent has no significant change in detergency. When using an oil film remover, the acetic acid odor becomes strong, which is not preferable.

As the colloidal silica used in the present invention, those which are stable in an acidic acetic acid aqueous solution are used, and commercially available products can be used. Preferable examples include Snowtex O, Snowtex OL, Snowtex C (all trade names) manufactured by Nissan Chemical Industries, Ltd. The main action in removing the oil film of colloidal silica is the action of improving the abrasiveness to the oil film and the wettability of the oil film remover to the oil film. Although it does not restrict | limit especially as a particle size of colloidal silica, In order to reduce the white residue after wiping off, it becomes like this. Preferably it is 10-50 nm, More preferably, it is 10-20 nm. The particle size described here is an average particle size according to the BET method. The blending amount of colloidal silica is not particularly limited, but is 1.0 to 4.0%, more preferably 1.5 to 2.5% in terms of anhydrous silicic acid (SiO ₂ ), in the oil film remover at the use concentration. It only has to be blended so that If the blending amount of anhydrous silicic acid is less than 1.0%, the detergency of the obtained oil film remover is weak. On the other hand, even if the blending amount of silicic acid anhydride exceeds 4.0%, the detergency of the resulting oil film removing agent is largely different. In addition, when the oil film remover after use is wiped off, the amount of wiping residue increases, resulting in poor workability.

  The surfactant used in the present invention is blended in order to sufficiently wet the oil film remover on the glass surface on which amino-modified silicone oil or the like is adhered, and to generate appropriate foam when using the oil film remover. The Although the kind of surfactant is not specifically limited, what affects the stability of colloidal silica cannot be used. Further, a surfactant that remains in a trace amount after washing cannot be used as a white residue on the glass. As the surfactant to be used, an anionic surfactant and a nonionic surfactant are preferable. Different types of surfactants may be used in combination.

  The blending amount of the surfactant is not particularly limited, but may be blended so as to be a concentration of 0.01 to 0.1% in the oil film removing agent at the use concentration. If the surfactant content is less than 0.01%, the resulting oil film remover has insufficient surface activity, and even if the surfactant content exceeds 0.1%, the surface active effect is obtained. On the contrary, it is not preferable because the wiping workability of the oil film removing agent is deteriorated.

  In the oil film remover of the present invention, water is the residue in addition to the above components, but the water is preferably purified water such as ion exchange water. In tap water and groundwater, the contained hardness component may adversely affect the finish of oil film removal.

  It is considered that the detergency of the oil film remover of the present invention with respect to the oil film to be noted is due to the synergistic action of acetic acid, colloidal silica, and surfactant. Even if each component is missing, or any component is lost, it does not reach the detergency of the oil film remover of the present invention for the oil film.

  As long as it does not interfere with the effect of the present invention as a component other than water, the oil film remover wiping operation is performed as necessary to lower the freezing temperature of the oil film remover or by adjusting the drying speed of the oil film remover during operation. In order to facilitate the process, an alcohol solvent, a glycol solvent, or a glycol ether solvent can be blended. In addition, the compounding of these solvents has little influence on the cleaning effect of the oil film remover of the present invention, and an improvement effect of the cleaning power cannot be expected. In addition, as long as the effect of the present invention is not hindered, a colorant, a preservative, a rust preventive agent and the like can be further blended in the oil film remover of the present invention as necessary.

  As a method of using the oil film remover for automobile glass of the present invention, the oil film remover of the present invention can be directly applied to the windshield or the like by hand spraying after treatment such as water-repellent car wash, coating car wash or wax car wash by an automatic car washer. The purpose is achieved by spraying onto the window glass or evenly spraying onto a clean window towel and then wiping the glass surface evenly.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, this invention is not restrict | limited at all by these Examples.

[Example 1]
In 796.8 g of ion-exchanged water, 0.2 g of surfactant E (KF-618, silicone surfactant, manufactured by Shin-Etsu Chemical Co., Ltd.) is added and dissolved, and then 3.0 g of acetic acid (90%) is added. After stirring. Next, 200 g of colloidal silica A (Snowtex O, manufactured by Nissan Chemical Industries, Ltd.) was added and stirred and homogenized to obtain an oil film remover of Example 1. The pH of the oil film remover at this time was 3.3.

[Examples 2-3, Comparative Examples 1-5]
By the same operation as in Example 1, oil film removers of Examples 2 and 3 and Comparative Examples 1 to 5 were obtained. The composition of each example is shown in Table 1, and the details of the components used in each example are shown in Table 2.

(test)
Using the oil film remover of the above-mentioned Examples and Comparative Examples, sprayed three times by hand spray (about 6 ml / each test surface) on the windshield surface of an automobile to which an oil film was adhered as described below, wetted with water and squeezed tightly. After thoroughly wiping with a clean window towel, it was wiped with a dry clean window towel. The following tests were conducted and the results are shown in Table 1.

[Front glass oil film treatment]
Using a commercially available oil film remover (with an abrasive), thoroughly clean the windshield of an automobile with water, and confirm that the glass surface is completely wetted. Two cars in this state are prepared, and each of them is subjected to a wax car wash or a water repellent car wash in a gate type car wash machine. By this car washing, oil films mainly composed of a wax component or amino-modified silicone oil are formed on the windshield. The front windshield surface of each automobile is divided into 10 parts vertically using a mending tape (upper 5 parts, lower 5 parts). In this state, it was left for 1 day outdoors and then used for the test.

[Wipeability]
In the 10-divided windshield surface, the upper right and lower two stages are oil film blanks (unwashed). The oil film remover of the example and the comparative example is sprayed on each divided surface by hand spraying. Immediately after spraying, wipe off the oil film remover. This cleaning operation is sequentially performed for each oil film remover, but the glass surface other than the test surface is masked with a masking film so that the sample oil film remover does not cover other divided surfaces. After wiping up with a clean dry towel for window cleaning, the following evaluation is performed visually for the presence or absence of oil film remover residue or white residue.
(Evaluation criteria) Visual determination ○: No wiping or white residue.
(Triangle | delta): There is little wiping residue and white residue.
X: Wiping remaining and white residue.

[Oil film removal]
On the windshield surface after wiping evaluation, tap water is applied evenly from the top through the watering nozzle. Thoroughly pour water to wash away any surfactant remaining on the glass surface. Then, the following evaluation is performed visually for the water wettability of the divided glass surfaces subjected to each cleaning test.
(Evaluation criteria) Visual determination ○: Completely wet.
Δ: Slightly wet.
X: It is water repellent without changing from blank (unwashed).

In the wiping property evaluation, a slight white residue was observed in the test section of the oil film removing agent of Example 2. This is considered to be due to the fact that the larger colloidal silica particle size is more noticeable even when a small amount of wiping residue of the oil film remover is present. However, at this level, it is judged that there is no practical problem if the finishing wiping is performed more carefully.
The oil film removing agent of Comparative Example 3 is a mixture of aluminum silicate (baked kaolin) as an example of a general abrasive, but the oil film removal property is high due to its polishing power, but it is polished by normal towel wiping. The agent cannot be wiped off, and white residue is clearly left on the treated glass surface. Since a water washing operation is required after this, it is not suitable for the purpose of the present invention.

  In the evaluation of the oil film removal property, the oil film of the wax car wash was almost removed even with the oil film remover of the comparative example, but the oil film of Examples 1 to 3 and Comparative Example 3 was used for the strong oil film of the water-repellent car wash. Except for the remover, the oil film is not sufficiently removed from the unwashed glass surface.

  What should be noted here is the oil film remover of Comparative Example 1 which is a combination of colloidal silica / surfactant, the oil film remover of Comparative Example 2 which is a combination of acetic acid / surfactant, colloidal silica / surfactant / ethanol. The oil film remover of Comparative Example 5 of the amine alkaline oil film remover has a significantly inferior oil film removal performance of the water-repellent car compared to the oil film remover by the combination of acetic acid / colloidal silica / surfactant of the present invention. It is.

  If the oil film remover of the present invention is used, a strong oil film that has been difficult with conventional oil film removers or glass cleaners can be easily removed, and the workability after the removal is good. It can be suitably used for the subsequent oil film removal treatment.

Claims (3)

  An oil film remover for automobile glass, comprising acetic acid, colloidal silica that is stable in an acidic acetic acid aqueous solution, and a surfactant mixed in water. The amount of acetic acid is 0.2 to 3.0% by mass, and the amount of colloidal silica is 1.0 to 4.0% by mass in terms of anhydrous silicic acid (SiO ₂ ). The oil film remover according to claim 1, wherein the amount of the surfactant is such that the concentration of the surfactant is 0.01 to 0.1% by mass.   The oil film removing agent according to claim 1, wherein the particle size of the colloidal silica is 10 to 50 nm.