JPH04189890A - Water-based pasty composition, removal of water-repelling film on glass surface using the composition and cleaning of glass surface - 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 [Industrial Field of Application] The present invention provides an aqueous paste composition that exhibits an excellent cleaning effect particularly on water-repellent coatings and is advantageously used for cleaning glass surfaces. , and a method for removing a water-repellent film on a glass surface and a method for cleaning a glass surface using the same.

More specifically, the present invention provides a water-based paste that can easily remove a water-repellent film derived from a water-repellent treatment agent applied to a glass surface such as a windshield of an automobile. A composition, a method of removing at least a water-repellent film derived from a water-repellent treatment agent applied to the glass from a glass surface using the aqueous paste composition, and a method using the aqueous paste composition. The present invention relates to a method for cleaning a glass surface, which removes at least the water-repellent film from the glass surface and makes the glass surface highly hydrophilic and clean.

The water-based paste composition of the present invention, the water-repellent film removal method Σ of the present invention using the same, and the glass surface cleaning method are effective for removing ordinary dirt such as oil film and dust from glass surfaces such as automobile windshields. It is effective for cleaning and removing silicone films, etc. and ensuring the transparency and appearance of the glass under normal conditions, and it also sufficiently removes the water-repellent film mentioned above to give the glass surface a high degree of wood affinity. Water droplets and non-uniform water thickness caused by oil film, silicone film, and especially water-repellent film when using wipers when driving a car at relatively low speeds, especially in light rain. It can be effectively used to prevent diffused reflection and fogging on glass surfaces such as windshields caused by the film, and to maintain high transparency.

[Prior art and inventions to be solved Section B] The surface of the glass used in automobiles, especially the outside, is contaminated by natural phenomena such as dust, dirt, and exhaust gas, as well as by polishing agents applied to the painted surface. Various types of dirt such as oil-based dirt may adhere to the product. Many waxes, especially silicone oils, are used as polishing agents, and stains caused by silicone oils are also referred to as silicone films. These various types of dirt impair the appearance of the glass and reduce transparency, so it is necessary to remove them in a timely manner.

Various types of cleaning agents are known for removing such stains from glass surfaces, depending on the type and nature of the stains. For example, for dust and light oil-based stains, an aqueous solution containing a normal surfactant as the main ingredient may be sufficient to clean it, or for relatively stubborn oil-based stains such as silicone film. is a fluid liquid with a small amount of abrasive dispersed in it.

Recently, however, it has become common practice to provide a water-repellent film by applying a water-repellent treatment agent to the surface of automobile glass, particularly windshields. When driving at high speeds in the rain, the wiper movement gets in the way, so instead of using it, the relatively large size of the windshield wiper is used to remove raindrops that adhere to the windshield surface, especially on the windshield surface, due to its strong water repellency. Water droplets are dispersed from the front surface (see-through surface) by strong air currents caused by high-speed driving, thereby ensuring transparency during driving.

However, when using such water repellent treatment agents, the transparency of the windshield can be effectively maintained when driving at high speeds in rainy weather due to the above principle, but when using the wipers when driving at low speeds in rainy weather. Due to its strong water repellency, water film patterns (such as stripes) with uneven thickness may form on the transparent surface of the glass, water droplets may remain, or fine clouding may occur during light rain. If anything, the transparency of the glass surface worsens, which has the opposite effect. In other words, in normal driving conditions in rainy weather other than when driving at high speeds, it is preferable that the water repellent treatment agent be removed from the glass surface; rather, the glass surface should be made sufficiently hydrophilic to prevent water droplets from adhering to it. It was found that forming a water film with a uniform thickness is effective in ensuring transparency of the glass surface.

However, the above-mentioned water-repellent treatment agents have the property of being difficult to remove when applied to glass surfaces, and conventional cleaning agents such as conventional cleaning agents mainly composed of surfactants and liquid cleaning agents in which abrasives are dispersed are difficult to remove. However, there was a problem in that it was very difficult to remove.

The present invention has been made in view of the above circumstances.

An object of the present invention is to easily and sufficiently remove, at least, a water-repellent film that is difficult to remove with conventional cleaning agents, such as a water-repellent treatment agent applied to a glass surface. When cleaning the glass surface,
Provided is an aqueous paste composition that is extremely effective for improving the transparency of glass such as windshields, especially during normal operation of automobiles in rainy weather. To provide a method for sufficiently removing at least a water-repellent film formed by a water-repellent treatment agent, and further a method for cleaning a glass surface by removing the water-repellent film and imparting further hydrophilicity to the glass surface. It is in.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present inventors have developed a method to solve the above-mentioned problems by using a water repellent treatment agent applied to various kinds of dirty glass such as automobile windshields. As a result of intensive research to develop a powerful glass surface cleaning agent that can easily remove water-based films, we found that the average particle size is below a certain value, and the hardness is on the glass surface. When an attempt was made to remove the water-repellent film on a glass surface using an aqueous paste composition containing an abrasive in a specific range of hardness that is greater than the hardness of the water-repellent film, the water-repellent film was It has been found that the film can be easily and extremely effectively removed together with other stains such as oil films. In addition, by removing the water-repellent film from the glass surface and sufficiently increasing its wood-philicity, it is possible to turn water such as raindrops that adhere to the glass surface into a thin, uniform water film due to its high hydrophilicity. As a result, it was also found that the transparency of glass surfaces such as windshields during normal driving in rainy weather (especially when using wipers) was significantly improved.

The inventors completed the present invention based on these findings.

That is, the present invention relates to an aqueous paste composition characterized by containing 5 to 30% by weight of an abrasive having an average particle size of 10 μm or less and a hardness greater than that of the water-repellent film on the glass surface. Also, as a method of using the aqueous paste composition of the present invention for washing and cleaning a glass surface, there is also a method for removing a water-repellent film on a glass surface, which is characterized by using the aqueous paste composition, and The present invention also provides a method for cleaning a glass surface, which comprises removing a water-repellent film from the glass surface using the aqueous paste composition, and then subjecting the glass surface to a wood-loving treatment.

Mono-Aqueous Paste Composition - The aqueous paste composition of the present invention is mainly used to remove dirt such as dust and ordinary oil film on glass surfaces such as automobile windshields, or silicone films caused by adhesion of polishing agents on the body. The composition is useful as a strong cleaning agent (cleaning agent) for glass surfaces, as it not only removes dirt from glass surfaces, but also removes water repellent agents applied to glass surfaces. In addition, it is important that the abrasive has a specific property such as a specific average particle diameter and a specific hardness range, and contains a specific proportion of the abrasive.

That is, it is important that the aqueous paste composition of the present invention contains an abrasive having an average particle diameter of 10 pm or less, preferably in the range of 0.5 to 5 pm.

If the average particle size of the abrasive is larger than 10 μm, the abrasive particles will be transferred to the cleaning surface during use, resulting in insufficient polishing effect, making it difficult to sufficiently remove minute dirt such as oil films and silicone films. Even if it were possible to remove these, it would be difficult to sufficiently remove the water-repellent film derived from the water-repellent treatment agent, and the object of the present invention could not be fully achieved. . Furthermore, if this average particle size is too small, sufficient polishing power may not be obtained.

There are no particular restrictions on the shape of the abrasive particles, and any shape can be used, such as angular, acicular, fibrous, flat, or unspecified shapes. It is preferable to use an angular shape because it has a greater polishing effect.

Furthermore, it is important that the abrasive has the above-mentioned specific average particle size and that its hardness is greater than that of the water-repellent film on the glass surface.

Even if the hardness of the abrasive used is greater than that of the target glass, the water-repellent film can be removed without damaging the glass surface by reducing the shared load with the sponge, etc. I can do that. If the hardness of the abrasive is less than that of the water-repellent film, the water-repellent film cannot be sufficiently removed.

In the present invention, the hardness range of the abrasive is defined by the following criteria.

In other words, the upper limit of the hardness of the abrasive should be such that when the glass surface is rubbed with the abrasive (specifically, an aqueous paste composition containing an abrasive), the glass surface will not be damaged. Since it differs depending on the type of glass surface to be treated, it may not be expressed by a uniform numerical value, or it may be determined in advance by experiment according to the above-mentioned criteria. - On the other hand, if the hardness of the abrasive is greater than the hardness of the water-repellent coating, it means that the glass having the water-repellent coating on its surface is treated with an abrasive (specifically, an aqueous paste composition containing an abrasive). This means that the water-repellent film is sufficiently hard that the water-repellent film can be sufficiently rubbed off when the water-repellent film is removed by rubbing. Therefore, the lower limit of the hardness of the abrasive used in the present invention is:
It varies depending on the type of water-repellent treatment agent used to form the water-repellent film. Therefore, the lower limit of the hardness of the abrasive may not be expressed by a uniform numerical value, but may be determined in advance through experiments according to the above-mentioned criteria.

In other words, a water-based paste composition containing an abrasive agent, preferably an abrasive agent, is used to actually clean a glass surface having a water-repellent film, and the water-repellent film is sufficiently coated without scratching the glass surface. The hardness of the abrasive can be judged based on whether or not it can be removed easily, and the type of abrasive that meets the criteria can be selected without numerically determining the hardness range itself. It is sufficient to adopt

As described above, the hardness range of the abrasive used in the aqueous paste composition of the present invention does not necessarily have to express the hardness numerically, but depends on the type of target glass and the type of water repellent agent used. can be directly determined by experiment.

Therefore, strictly speaking, does the hardness range of the abrasive used in the aqueous paste composition of the present invention vary depending on the type of target glass and the type of water repellent treatment agent used? In terms of practical use, for example, when used on the windshield of a car, the types of glass to be treated and the types of water repellent agents used are virtually limited, and the fields in which it can be used in general are also limited. However, the type of glass and water-repellent treatment agent (i.e., the hardness of the glass and water-repellent coating) is also limited, and in general, even if the field of use is not particularly limited, glass is softer and softer depending on the field. Since it is possible to conduct experiments with a sufficiently hard water-repellent film, the aqueous paste composition of the present invention can be used in various fields or in a wide range of fields by setting the hardness range of the abrasive to a sufficiently narrow range. It can be supplied to the market as a product that can be used in many fields, and even in all fields. Regarding the water-repellent film formed on the windshield surface of an automobile, it is generally preferable to use an abrasive having a hardness of 5 to 1O on the Mohs scale.

Various types of water repellent agents are used, and specific examples include Japanese Patent Application Laid-Open No. 52-8608.
Ra1nX [UNELKOC0RPO
A trademark of a water repellent manufactured by RATION (USA)].

As for the type of abrasive to be contained in the aqueous paste composition of the present invention, various particulates can be used as long as they satisfy the above average particle size and hardness range. For example, alumina (Mohs hardness, 9),
Silica (Mohs hardness, approximately 7), cerium oxide (Mohs hardness, 5), titanium oxide (Mohs hardness, 6-7), zirconium oxide (Mohs hardness, 7), iron oxide (Mohs hardness).

5.5N6.5), silicon carbide (Mohs hardness.

9.1), inorganic compounds such as silicon nitride (dry space hardness +8.5), and naturally occurring inorganic substances. Among these, alumina, cerium oxide, silicon carbide, etc. are particularly preferred.

Note that these abrasives may be used alone,
Two or more types can also be used together.

The aqueous paste composition of the present invention is composed of at least the abrasive and water, and optionally contains a thickener, a surfactant having a dispersing effect or a cleaning effect, a water-soluble solvent, etc. Other optional components such as a solvent may be included as appropriate. Normally.

In addition to the abrasive and water, it is preferable to appropriately contain at least a suitable thickener, a surfactant having a dispersing effect or a cleaning effect, a water-soluble solvent, and the like.

One of the important points in the aqueous paste composition of the present invention is that 5 to 30% by weight, preferably 1% by weight, preferably 1
The content is in the range of 0 to 25% by weight. If the content of this abrasive is less than 5% by weight, the amount of abrasive per unit area on the treated surface will be small, the removal effect of the water-repellent film will be insufficient, and the composition will be finished in a paste form. There are times when things become difficult. - 30
If the proportion of the abrasive is too high, the polishing effect will not be improved and the abrasive will be wasted.If the proportion of the abrasive is too high, the composition will become too hard and the cleaning operation will become difficult.

The wood content is usually in the range of 50 to 90% by weight, preferably 60 to 80% by weight.

The thickener is not particularly limited, and various kinds of thickeners, such as those normally used in this type of detergent, can be used.Specifically, for example, clay, bentonite, methylcellulose, polyethylene glycol, Alginate sorter, polyacrylamide, polyafrylmi 1. ! You can also mention things like powder. Among these, bentonite, clay, etc. are particularly preferred.

In addition, these thickeners may be used singly or in combination of two or more, if necessary.

The thickener is usually 0.1 to 25% by weight, particularly 0.5 to 25% by weight.
It is preferable to contain it in a proportion in the range of 20% by weight.

If the content of the thickener is too low, the resulting composition may not become pasty but fluid, whereas if the content is too high,
The resulting composition may become too hard, resulting in problems such as reduced cleaning effectiveness or difficulty in cleaning operations.

As the surfactant having the above-mentioned dispersing effect and cleaning effect,
There is no particular restriction, and various materials such as those normally used in this type of cleaning agent may be used. Specifically, for example, alkylbenzene sulfonates, higher fatty acid salts,
Anionic surfactants such as naphthalene sulfonic acid formaldehyde condensate salts, alkyl phosphates, higher sulfuric acid ester salts, aliphatic amine sulfates, nonionic surfactants such as POE alkyl ethers, POE alkylphenol ethers, and fatty acid esters. I can list many things. Among these surfactants, anionic surfactants such as alkylbenzene sulfonate and naphthalene sulfonic acid formaldehyde condensate sodium salt are particularly preferred. These surfactants may be used singly or in combination of two or more, if necessary.

The surfactant is usually added in a proportion of 5% by weight or less, if necessary.

By adding the surfactant, the dispersibility of the abrasive can be significantly improved, the paste state can be maintained more stably, and the cleaning performance can be further improved. .

Examples of the water-soluble solvent include lower alcohols such as methanol, ethanol, propatool, isoproptool, and phthanol, and ethylene glycol (EG).
, propylene glycol (PG), polyhydric alcohols such as chrycerin and pentaerythritol, cellosols, and ketones such as methyl ethyl ketone and methyl isophthyl ketone. Among these, EG, PC, chrycerin, etc. are particularly preferred.

These water-soluble solvents may be used alone or in combination of two or more.

Furthermore, by adding these water-soluble solvents,
By adjusting the liquid properties of water, it is possible to achieve effects such as promoting the dispersibility of abrasive particles and the effect of a thickener.

The water-soluble solvent is preferably contained in a proportion selected from the range of 3 to 20% by weight.

Furthermore, the aqueous paste composition of the present invention may contain other components other than those mentioned above, if necessary, as long as they do not impede the object of the present invention. For example, an abrasive having properties other than the abrasive described above may be contained in a proportion within the range of hindrance, and a small amount of fragrance, coloring agent, preservative, etc. may be included as necessary.

The aqueous paste composition of the present invention is made into a paste by adding water to each of the above components, or the amount of water to be added is not particularly limited, and at least water is added to each component. They may be added and mixed so that the resulting aqueous paste composition has a paste state within the following range. In other words, the hardness of the paste state is determined by the penetration level, which is usually
It is desirable that the weight be in the range of 15 to 30 g. If the penetration of the composition is less than 15 g, the adhesion between the composition and the glass surface will be insufficient, and the ability to remove stains from the water-repellent film, etc., may be reduced. In addition, if the penetration of the composition becomes extremely small and it changes from pasty to fluid liquid, it becomes difficult to remove stubborn stains from water-repellent coatings, etc., and the object of the present invention is not fully achieved. I can't say anything anymore.

On the other hand, if the penetration of the composition exceeds 30 g, the composition becomes too hard, which may cause the inconvenience of requiring unnecessary force during cleaning. Furthermore, if the penetration of the composition becomes significantly large, it will no longer be called a paste-like substance but will become more like a solid, in which case the cleaning operation will become difficult.

That is, since the composition of the present invention is in the form of a paste with appropriate hardness as described above, it is possible to effectively remove stubborn deposits such as water-repellent coatings and stains.

Furthermore, since the composition of the present invention is in the form of a paste with appropriate hardness, (1) in the case of conventional liquid cleaning agents, the liquid composition does not scatter onto surfaces other than the surfaces to be cleaned, such as the body of an automobile; The composition of the present invention does not cause problems such as staining the body or damaging the painted surface when wiping it off. It can be easily and completely removed from the glass surface by wiping it off after use, so it is significantly superior in handling and operability compared to conventional liquid cleaning agents. (4) In the case of the composition of the present invention, it is possible to maintain a highly dispersed state at all times without causing phase separation of the composition, unlike cleaning agents containing abrasives. It has various advantages such as ease of handling and storage.

As described above, the aqueous paste composition of the present invention can be easily made into a paste having an appropriate hardness by appropriately adjusting the composition of each of the components.

The aqueous paste composition of the present invention can be obtained by mixing predetermined amounts of each of the predetermined components.

There are no particular restrictions on the order or method of mixing each component.
They may be mixed in any order. An example of a preferred preparation method is, for example, by mixing an appropriate amount of the surfactant and water-soluble solvent in water, then adding a predetermined amount of the abrasive to disperse it well, and then adding the thickener. It is possible to list methods for mixing appropriate amounts. The proportions of each of the components to be mixed are as described above, and the proportions are adjusted as appropriate depending on the purpose of use within a range that satisfies the predetermined proportions, and a paste-like composition of desired hardness is finished. That's fine.

The aqueous paste composition of the present invention prepared as described above is a strong glass surface that can easily remove the water-repellent film on glass surfaces treated with water-repellent agents, such as automobile windshields. Cleaning agent (cleaning agent) is used, water-repellent film is not applied, dirt, dust, etc., dirt from exhaust gas, etc.
It is a glass surface cleaning agent (cleaning agent) that is extremely advantageous in practical terms because it can simultaneously remove various types of dirt and deposits such as ordinary oil films and silicone films derived from polishing agents on painted surfaces such as bodies. be. Further, since the aqueous paste composition of the present invention is in paste form, it has various advantages described in (1) to (4) above. The aqueous paste composition of the present invention can also be effectively used on glass surfaces that do not have a water-repellent film.

Therefore, the water-based paste composition of the present invention is advantageous in the field of cleaning (cleaning) various glass surfaces, including the cleaning (cleaning) of glass surfaces with water-repellent coatings such as automobile windshields. You can use it.

Furthermore, the aqueous paste composition of the present invention can also be suitably used as a cleaning agent for stains on objects other than glass surfaces.

Method for removing a water-repellent film - As described above, the aqueous paste composition of the present invention easily removes a water-repellent film derived from the water-repellent treatment agent that is firmly attached to a glass surface such as an automobile windshield. It is a powerful cleaning agent (cleaning agent) that can do a lot of things.

The method for removing the water-repellent film of the present invention is not particularly limited except that the water-repellent film is removed using the aqueous paste composition of the present invention described above. It may be carried out by various operations, such as the same operation as that used for removing the silicone film using an agent, or a method that takes advantage of the fact that the composition of the present invention is in the form of a paste.

Specifically, for example, the aqueous paste composition of the present invention is applied to a desired glass surface and/or a cleaning cloth using a tuner, etc., the glass surface is rubbed as is to remove the water-repellent film, and then the water-based paste composition of the present invention is applied to a desired glass surface and/or a cleaning cloth. The aqueous paste composition may be sufficiently wiped off with a cloth. At this time, other stains can be removed at the same time as the water-repellent film. Further, before removing the water-repellent film from the aqueous paste composition of the present invention, ordinary stains such as dust may be removed in advance by any method.

In addition, after removing the water-repellent film and the aqueous paste composition, if necessary, wipe the surface with a dry, clean finishing cloth or a cloth moistened with clean ice. Alternatively, any post-processing may be performed, such as cleaning the glass surface by applying a parent wood treatment to be described later.

As the cleaning cloths, wiping cloths, finishing cloths, etc., various kinds of cloths can be used, such as those used in the field of ordinary cleaning of glass surfaces, and specifically, for example, towels. , cloths, miscellaneous items [1], or special cloths, sponges, tissue paper, non-tissue paper, etc. In addition, chamois leather can also be used as a finishing cloth. These cloths may be used separately for each purpose, or some or all of them may be covered with shared cloth to make operations easier or to save on cloth. You may do so.

As described above, the water-repellent film derived from the water-repellent treatment agent can be easily and sufficiently removed from the glass surface, and the glass surface can be significantly cleaned.

1. Glass surface cleaning method - In the glass surface cleaning method of the present invention, after removing the water-repellent film from the glass surface as described above, the glass surface is subjected to a wood-filtering treatment to clean the glass surface. Clean thoroughly.

This wood parenting treatment is preferably carried out after the water-repellent film has been removed, for example after the aqueous paste composition used has been sufficiently removed by the method described above.

Are various methods possible for the parent tree processing?
For example, a method of coating the glass surface with a wood-loving film, a method of applying a hydrophilic surfactant, and a method of coating the glass surface with a hydrophilic surfactant are used. 13431
No., Special Publication No. 52-47926, Special Publication No. 56-1929
No. 9, Japanese Patent Publication No. 60-4231, a method of applying a glass surface treatment agent) can be suitably employed.

In the manner described above, the desired glass surface can be significantly cleaned, and even higher wood-philicity can be imparted to the glass surface.

The method for removing a water-repellent film on a glass surface according to the present invention Preferably, according to the method for cleaning a glass surface of the present invention, the water-repellent film derived from the water-repellent treatment agent on a glass surface such as an automobile windshield can be easily removed. In addition, it is necessary to thoroughly remove dust, dirt from exhaust gas, oily dirt such as oil film, etc.
It is also possible to remove silicone films derived from polishing agents at the same time, making it possible to achieve extremely clean glass surfaces in a short time and with ease. Furthermore, according to the method of the present invention, the glass surface can be made extremely hydrophilic.

As a result, not only the transparency and appearance of the glass in normal conditions are significantly improved, but also the diffused reflection on the glass surface (transparent surface) such as the windshield surface during normal driving when using the rain wiper of a car. It can effectively prevent water droplets, unevenly thick water films, striped patterns, and fogging that can cause refraction, and can significantly improve the transparency of the glass, improving safety. You can make sure you have enough.

[Examples] Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

(Example 1) The components shown below were sequentially mixed in the order listed to prepare an aqueous paste composition having the composition shown below.

The penetration of this paste (measured using a rheometer manufactured by Fudo Kogyo ■) was 23 g.

Tadatane Kunbe Kanesashi Water ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・
66.5% by weight・Chrycerin・・・・・・・・・・4
．． 5% by weight・Clay・・・・・・・・・13.0
Weight %・Hentonite・・・・・・・・・ 1.0 weight %・Alumina (average particle size 1.0 μm) ・15.0 weight % Take about 5 g of this aqueous paste composition on a sponge and use it to repel it. Automobile windshield surface (7 cm x
20 cm) was washed according to a conventional method. As a result, the water repellent film could be removed very easily. The windshield surface also had a silicone film from the polishing agent on the painted surface of the body, as well as dirt such as an oil film and dust, which could easily be removed by the above-mentioned cleaning operation.

The degree and ease with which the water-repellent film can be removed by this cleaning are used as criteria for evaluating the cleaning performance of the cleaning agent.On the other hand, the hardness of the cleaning agent (in this case, the water-based paste composition) It was evaluated based on the condition.

These evaluation results are shown in Table 1.

(Example 2) The components shown below were sequentially mixed in the order listed to prepare an aqueous paste composition having the composition shown below.

The penetration of this paste was 28 g.

Reduced by 5 plates of tazuharu・Water・・・・・・・・・・・・60.0% by weight・P
G・・・・・・・・・・・・・ 7.0 weight%・Bentonite・・・・・・・ 3.0 weight%・Alumina (average particle size 0.5 μm)・5.0 weight %・Silicon oxide (average particle size 1.OBm) 15.0% by weight Approximately 5 g of this aqueous paste composition was taken on a sponge, and a water-repellent film treated with a water-repellent treatment agent (RainX, described above) was applied. The windshield surface (7 cm x 20 cm) of a car was washed according to a conventional method. As a result, the water-repellent film could be removed extremely easily. The windshield surface also had a silicone film from the polishing agent on the painted surface of the body, as well as dirt such as an oil film and dust, but these were also easily removed by the above-mentioned cleaning operation.

Note that the detergency and hardness of this detergent were evaluated using the same criteria as in Example 1.

These evaluation results are shown in Table 1.

(Example 3) The components shown below were sequentially mixed in the order listed to prepare an aqueous paste composition having the composition shown below.

The penetration of this paste was 25 g.

Upi Wataru Gosenmetsu・Water・・・・・・・・・・・72.0% by weight
・POE nonylphenol ether (I company regulation 6)...
... 0.5% by weight ・Bentonite 25% by weight ・Cerium oxide (average particle size 1.0 μm) 25.0% by weight Approximately 5 g of this aqueous paste composition was The mixture was taken on a sponge and washed in a conventional manner on the windshield surface (7 cm x 20 cm) of an automobile, which had a water-repellent coating treated with a water-repellent treatment agent (RainX: described above). As a result, the water-repellent film could be removed extremely easily. The windshield surface also had a silicone film from the polishing agent on the painted surface of the body, as well as dirt such as an oil film and dust, but these were also easily removed by the above-mentioned cleaning operation.

Note that the detergency and hardness of this detergent were evaluated using the same criteria as in Example 1.

These evaluation results are shown in Table 1.

(Example 4) The components shown below were sequentially mixed in the order listed to prepare an aqueous paste composition having the composition shown below.

The penetration of this paste was 14 g.

Composition of composition/Water... ・・・-... ・--71.5% by weight
・EG・・・・・・・・・・・10.0% by weight・
Clay: 50% by weight, Bentonite: 1.5% by weight, Alumina (
average particle size 1.0 μm)・15.0% by weight・Silicon carbide (
Average particle size: 1.0 μm) 10.0% by weight Sodium dodecylbenzenesulfonate...05% by weight Approximately 5 g of this aqueous paste composition was placed on a sponge and treated with a water repellent treatment agent (RainX: as described above). ) Automobile windshield surface (7cm x 2
0 cm) was washed according to a conventional method. As a result, the water-repellent film could be removed extremely easily. The windshield surface also had a silicone film from the polishing agent on the painted surface of the body, as well as dirt such as an oil film and dust, but these were also easily removed by the above-mentioned cleaning operation.

The cleaning properties and hardness of this cleaning agent were evaluated using the same criteria as in Example 1.

These evaluation results are shown in Table 1.

(Comparative Example 1) As a comparative example, a cleaning agent with the following composition was prepared and the water repellency of the windshield surface was evaluated in the same manner as in Example 1, except that this was used in place of the aqueous paste composition of Example 1. Attempts were made to clean and remove the film.

Hongpi Soummei Dai・Water・・・・・・・・・・・・・73.0% by weight・P
G...70% by weight Alumina (average particle size zum)...20-0% by weight Evaluated according to criteria.゛The results are shown in Table 1.

(Comparative Example 2) As a comparative example, a cleaning agent with the following composition was prepared and the water repellency of the windshield surface was evaluated in the same manner as in Example 1, except that this was used in place of the aqueous paste composition of Example 1. Attempts were made to clean and remove the film.

Composition: Water: 650% by weight; Glycerin: 10.0% by weight; Cerium oxide (average particle size: 3.0m) )・5.0% by weight・Alumina (average particle size 1.0 μm)・20.0% by weight At that time,
The detergency and hardness of this detergent were evaluated according to the criteria of Example I.

The results are shown in Table 1.

(Comparative Example 3) As a comparative example, a cleaning agent with the following composition was prepared and the water repellency of the windshield surface was evaluated in the same manner as in Example 1, except that this was used in place of the aqueous paste composition of Example 1. Attempts were made to clean and remove the film.

Composition of composition・Water・・・・・・・・・・670% by weight・PG
・・・・ ・・ ・・・・・ 5.0% by weight・Bentonite・・・・・・・ 50% by weight・Cerium oxide (average particle size 3.Ourr+) ・13.0% by weight・Alumina (average particle size 2.Oum) ・10.0% by weight・
Clay: 200% by weight The detergency and hardness of this detergent were evaluated according to the criteria in Example j.

The results are shown in Table 1.

(Comparative Example 4) As a comparative example, a cleaning agent with the following composition was prepared and the water repellency of the windshield surface was evaluated in the same manner as in Example 1, except that this was used in place of the aqueous paste composition of Example 1. Attempts were made to clean and remove the film.

Composition of composition・Water・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・
560% by weight・EG・・・・・・・・・・・・ 50
Weight% Clay・・・・・・・・・35.0 Weight%-Silicon carbide (average particle size 1.1 am) 4.0
Weight % At that time, the detergency and hardness of this detergent were evaluated according to the criteria of Example 1.

The results are shown in Table 1.

(Comparative Example 5) As a comparative example, a cleaning agent with the following composition was prepared and the water repellency of the windshield surface was evaluated in the same manner as in Example 1, except that this was used in place of the aqueous paste composition of Example 1. Attempts were made to clean and remove the film.

Composition composition・Water・・・・・・・・・・91.5% by weight・P
OE nonylphenol ether (HLB16+ ・05% by weight ・Clay・・・・・・・・・・・・・・50% by weight・Cerium oxide (average particle size 1.0 μm) ・30% by weight At that time, use this cleaning agent for cleaning The properties and hardness were evaluated according to the criteria of Example 1.

The results are shown in Table 1.

Table 1 *L, Cleanability evaluation criteria ○ The glass surface got wet evenly after washing.

△ Water spots appeared in some places on the glass surface after washing with water.

×　It was water-repellent even before washing.

[Effects of the Invention] According to the present invention, since the cleaning agent is constituted as a paste composition containing a specific proportion of abrasives having a specific average particle size and a specific hardness range, ,−
The water-repellent film, which is difficult to remove with conventional cleaning agents, such as water-repellent treatment agents applied to the glass surface, can be easily and sufficiently removed from the glass surface, making it possible to clean the glass surface. In particular, it is possible to provide an aqueous paste composition that is extremely effective in improving the transparency of glass such as windshields during normal operation of automobiles in rainy weather.

Further, according to the present invention, there is provided a method for easily and sufficiently removing at least a water-repellent film formed by a water-repellent treatment agent or the like from a glass surface such as an automobile windshield using the aqueous paste composition of the present invention. be able to.

Furthermore, according to the present invention, the above-mentioned water-repellent film is removed using the aqueous paste composition of the present invention, thereby imparting even more hydrophilicity to glass surfaces such as automobile windshields, and significantly cleaning the glass surfaces. It is possible to provide a simple and practical method for

In addition, since the aqueous paste composition of the present invention is in the form of a paste with appropriate hardness, in addition to the above-mentioned strong cleaning effect, it also has remarkable ease of handling and storage, and has the following benefits: It is also equipped with a ton.

■It does not contaminate the car body or damage the painted surface, which is the case with conventional liquid cleaning agents.

■It can be easily and completely removed from glass surfaces by simply wiping it off after use.

(2) Unlike conventional liquid detergents containing abrasives, the composition does not undergo phase separation and can maintain a highly dispersed state at all times.

■For example, it can be stored in a tube or the like.

As described above, the present invention is extremely valuable in the field of washing or cleaning glass surfaces such as automobile windshields.

Patent applicant: Taihohe Gyo Co., Ltd.

Claims (3)

[Claims] (1) An aqueous paste composition characterized by containing 5 to 30% by weight of an abrasive having an average particle size of 10 μm or less and a hardness smaller than that of glass and larger than the water-repellent film on the glass surface. thing. (2) A method for removing a water-repellent film from a glass surface, which comprises using the aqueous paste composition according to claim 1. (3) A method for cleaning a glass surface, which comprises removing a water-repellent film from the glass surface using the aqueous paste composition according to claim 1, and then subjecting the glass surface to a hydrophilic treatment.