JPS5923598B2 - Marking cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaner for marking rubber products.

Conventionally, vulcanized rubber products such as tires for automobiles, belts, rubber sheets for construction, etc. are known.

These rubber products have extremely complex raw material compositions depending on their usage conditions. For example, in the case of automobile tires, which are used under very harsh conditions, they are first made of styrene-butadiene rubber, etc., then added with ultraviolet anti-aging agents, vulcanizing agents, vulcanization accelerators, softeners, and process oils. , carbon black, reinforcing fibers, etc. are added to the product. When a tire having such a composition is used, the above-mentioned oils and fats, anti-aging agents, and other additive components ooze out into the surface layer to protect the rubber.

By the way, recently, tires with white lines on the sidewalls of automobile tires have been manufactured by embedding white rubber during tire manufacturing as markings for automobile tires, or tires with various markings on the sidewalls of tires using special marking compositions. It is becoming common to see tires with patterns such as . However, as mentioned above, during use of tires, some of the raw materials such as stearic acid, paraffins, tar, process oil, carbon black, sulfur, and other additives ooze out onto the surface layer.
The marking layer is severely contaminated.

Furthermore, while the vehicle is running, oil, asphalt, sand, muddy water, etc. are scattered from the outside and adhere to the tire surface, further increasing the contamination of the marking layer.

Since the substances adhering to the surface of the marking layer cannot be removed at all with water or soapy water, the marking layer has become very unsightly.

Conventional tires were black, so the deposits mentioned above were not noticeable, but dirt is especially noticeable with white or light-colored markings, and in extreme cases, the markings affect the overall aesthetic appearance. This results in a significant loss of performance. The present inventors have arrived at the present invention as a result of various studies regarding the removal of contaminants that have oozed out or adhered to these marking layers.

That is, the present invention comprises (1) 70 to 99% by weight of one or more solvents selected from ether alcohols having a boiling point of 160° C. or higher or their acetic esters, and 1 to 3% by weight of acetone.
Cleaner for marking rubber products consisting of 0% by weight,
(2) 40 to 60% by weight of one or more solvents selected from ether alcohols with a boiling point of 160°C or higher or their acetate esters, 1 to 30% by weight of acetone, and up to 50% by weight of water and/or Cleaner for marking rubber products made of water-soluble polyhydric alcohol, (3)
One or more solvents selected from ether alcohols with a boiling point of 160°C or higher or their acetate 68
97% by weight, 1 to 30% by weight of acetone, and 2% by weight or less of a surfactant.

In other words, the present invention is a cleaner mainly containing one or more solvents selected from ether alcohols or their acetate esters, and is particularly a cleaner for removing stains from marking surfaces used in rubber products. be.

The ether alcohols with a boiling point of 160°C or higher used in the present invention include diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol monomethyl ether, triethylene Glycol monoethyl ether, propylene glycol monobutyl ether, 1-butoxy ethoxypropanol, dipropylene glycol monomethyl ether,
Examples include dipropylene glycol monoethyl ether and tripropylene glycol monomethyl ether.

(However, diethylene glycol monobutyl ether is excluded.) Examples of the acetic acid ester of ether alcohol used in the present invention include diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, and the like. These are 1 type or 2
Can be used as a mixture of more than one species.

If the ether alcohols or their acetate used in the present invention are dried too quickly, they will not be effective in removing contamination, and their boiling point will be 160°C due to flammability.
Must be above.

The ether alcohols or their acetate esters used in the present invention are extremely effective in removing contaminants that exude from the inside of rubber products and adhere to the surface of the marking layer. That is, paraffin, tar, process oil, etc. that exude from the inside of the rubber product and adhere to the surface of the marking layer can be easily removed by applying the above-mentioned solvent, and the solvent does not soak the marking layer at all. Since the solubility in water is very high, the cleaner containing dissolved contaminants can be washed away by washing with water at the end.

However, diethylene glycol dibutyl ether, propylene glycol monobutyl ether, etc., which have low solubility in water, can be easily removed with water by mixing them with acetone or a water-soluble polyhydric alcohol, which will be described later.

A cleaner according to a first aspect of the present invention is a cleaner in which acetone is added to the ether alcohol or its acetate.

The acetone used here is effective for removing, for example, oils and fats that are scattered from the outside and adhered to the surface of the marking layer while the car is running.

However, if the amount of acetone exceeds 30% by weight in the cleaner, the marking layer will be dissolved and swollen by the cleaner, which is not preferable.

Naturally, acetone also has a high solubility in water, so it can be removed by washing with water after applying the cleaner. or,
In the second embodiment of the present invention, water and/or a water-soluble polyhydric alcohol is used in addition to the above-mentioned ether alcohols or their acetate esters and acetone.

By using water in the cleaner of the present invention,
It has the effect of washing away mud and the like that are scattered and adhered to the outside of tires, etc., and also serves to reduce the risk of the cleaner itself igniting to some extent.

On the other hand, the water-soluble polyhydric alcohol is used to thicken the cleaner liquid and thereby prevent the ether alcohol or its acetate and acetone solution from dripping or flowing down.

Of course, the polyhydric alcohol must also be water-soluble since it must be able to be removed by washing with water at the end.

Examples of the water-soluble polyhydric alcohol include ethylene glycol, 1,2-propylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, 2-
Examples include methyl-2,4-pentanediol, hexanediol-2-5, heptanediol-2,4, dipropylene glycol triethylene glycol, polyethylene glycol, glycerin, etc. These can be used alone or as a mixture of two or more. used. The water and/or water-soluble polyhydric alcohol accounts for 50% of the total cleaner components.
It is used in an amount of not more than 10% by weight, preferably 10 to 40% by weight.

If the amount of water and/or water-soluble polyhydric alcohol used exceeds 50% by weight, it is not preferable because the concentration of the contaminant removing component becomes diluted.

Furthermore, in the third aspect of the present invention, a surfactant is used in addition to ether alcohols or their acetate esters and acetone.

The use of the surfactant is preferred to aid in the penetration of the cleaner fluid into the marking layer.

The amount of surfactant used is 2% by weight or less, preferably 0.1% by weight or more based on the total cleaner components. As the surfactant, commercially available anionic surfactants, cationic surfactants, and nonionic surfactants can be used, but anionic surfactants that have good permeability to oil, tar, mineral oil, etc. are particularly suitable. Surfactants or nonionic surfactants are preferred. The main aspects of the present invention have been described in detail above, but it is clear from the contents described above that the cleaner of the present invention contains (1) ether alcohols or their acetates;
0% by weight or less of water and/or water-soluble polyhydric alcohol, (4) ether alcohols or their acetic esters and 2% by weight or less of a surfactant, (11040-60% by weight)
ether alcohols or acetic esters thereof, 1 to 3
Combinations such as 0% by weight of acetone, 50% by weight or less of water and/or water-soluble polyhydric alcohol, and 2% by weight or less of a surfactant are also preferred. The cleaner of the present invention as described above is commercially available as it is or after being made into an aerosol together with dimethyl ether, LPGl fusogas, etc.

The thus obtained cleaner of the present invention is applied onto the marking layer of a rubber product by a method such as brushing or spraying, and after being left for a while, the dirt on the marking layer can be easily removed by wiping it off or washing it off with water. can do. Cleaner 11ζ of the present invention can of course remove dirt from the marking layer as described above, but can also remove oil etc. adhering to the rubber product itself. Even if it is applied, there is no problem.

As mentioned above, the cleaner of the present invention can completely remove dirt from the marking layer without damaging rubber products, and can be easily washed with water at the end, making it very useful as a cleaner for car tire markings. It is also useful as a marking cleaner for other rubber products. The details of the present invention will be explained below with reference to Examples.

"Part" or "%" indicates "part by weight" or "% by weight".
Example First, a marking composition was obtained using the following formulation.

) The above composition was applied to the sidewall of a passenger car tire in the following manner.

First, the coated area on the sidewall of the tire was wiped with a neutral detergent, and then further wiped with a solvent to condition the surface.

Next, masking tape was applied to areas other than the required pattern, and then the marking composition was applied thinly twice. The masking tape was removed 20 to 30 minutes after coating, and the coating was further dried at room temperature for about 2 hours to form a marking layer. The thus marked tires were attached to a passenger car and the car was actually driven for 7 days (300 km). Next, a cleaner of the present invention was obtained using the following formulation. When the cleaner was applied to half of the tire marking layer after running, and the tire was left for a while and then washed with water, the dirt on the marking layer could be easily removed, and the color could be restored to almost the same color as before running. . That is, after the tire has been driven, exudates from the inside and dirt such as oil and mud from the outside adhere to the marking layer, causing the tire to turn brown.
These stains could be easily removed using the cleaner. It is clear from the above examples that the cleaner of the present invention has excellent stain removal properties as a cleaner for marking rubber products.

Claims (1)

[Claims] 1. Marking of rubber products consisting of 70-99% by weight of one or more solvents selected from ether alcohols having a boiling point of 160°C or higher or their acetate esters, and 1-30% by weight of acetone. cleaner. 2 40 to 60% by weight of one or more solvents selected from ether alcohols with a boiling point of 160°C or higher or their acetate esters, 1 to 30% by weight of acetone, and 5
A cleaner for marking rubber products comprising 0% by weight or less of water and/or water-soluble polyhydric alcohol. 3. A rubber product consisting of 68-97% by weight of one or more solvents selected from ether alcohols with a boiling point of 160°C or higher or their acetate esters, 1-30% by weight of acetone, and 2% by weight or less of a surfactant. Cleaner for marking.