JPS6341203A - Tire - Google Patents

Abstract

PURPOSE:To prevent fading and to improve the appearance of a tire for vehicle, by applying a polyethylene glycol alcohol solution having specific molecular weight onto the surface of the tire. CONSTITUTION:Polyethylene glycol having the molecular weight of 150-600 is mixed by 4-50wt% into alcohol so as to prepare an alcohol solution coating agent. Here, the alcohol must evaporate and disappear completely like ethanol. Then said coating agent is applied onto the surface of a tire. Consequently, fading of the surface of the tire is prevented and good appearance of tire can be maintained for a long term.

Description

Detailed Description of the Invention [Industrial Use of Bone SF] The present invention prevents tire discoloration by applying a coating liquid containing polyethylene glycol to the tire surface,
This invention relates to a tire that has significantly improved the appearance of the tire, especially when stored for a long period of time, and has increased commercial value.

(Conventional technology) For example, natural rubber is used as raw material for automobile tires.
Since styrene-butadiene rubber, butadiene rubber, isoprene rubber, etc. are mainly used, amine-based anti-aging agents, paraffin-based waxes, etc. are blended to improve their weather resistance. These anti-aging agents and waxes migrate to the tire surface in a short period of time, causing the tire surface to turn brown during storage or distribution.
This had the disadvantage that the commercial value of the tire was significantly reduced.

[Problem that the invention seeks to solve]

Many coating agents exist to prevent such discoloration and maintain the appearance of tires, but these coating agents have many problems such as inhibiting the function of the original anti-aging agent and wax. In order to solve this problem, JP-A-60-3
No. 8205 proposes a tire whose surface is coated with silicone oil.

However, with this tire, there is a problem that by applying silicone oil, the bead RIS becomes easily soaked, and as a result, the tire is likely to come off the rim, reducing the safety of the vehicle.

On the other hand, glycol-based chemicals are used as lubricants to facilitate the process of assembling tires and rims, but they have no track record of being used as paints to prevent tire discoloration, and their suitability remains unclear. is unknown, and when a glycol-based agent is used alone, it is difficult to apply uniformly because of its strong polarity and lack of WL compatibility with the rubber body forming the base of the tire.

The present invention is based on applying a coating agent containing polyethylene glycol with a molecular weight of 150 to 600 to the surface of Tie-1, thereby preventing discoloration of the surface, increasing the commercial value, and maintaining rim removal resistance. The purpose of the present invention is to provide a tire that can ensure driving safety and solve the aforementioned problems.

[Means for solving problems]

Hereinafter, an embodiment of the means of the present invention that can achieve the above-mentioned objects and solve the problems will be described.

The present invention is a tire formed by coating the tire surface with an alcohol solution coating agent prepared by alcoholizing polyethylene glycol having a molecular weight of 150 to 600.

Polyethylene glycol is 110-(C)l,C)1.
As shown by the general formulas 0)l, and H, it is known that there are various polymerization states, and that their properties differ depending on their molecular weight.

In addition, due to the presence of many (-Oil) groups in polyethylene glycol, it has strong polarity (and is difficult to mix with non-polar tire surfaces), and because they repel each other, it is difficult to adhere to the tire surface. Therefore, polyethylene glycol In order to impart a surface-active effect to the tire and to impart adhesion to the tire, an alcohol is used as a solvent, which can dissolve polyethylene glycol and which can be evaporated and dried by volatilization after being applied.

The alcohol is preferably one that completely disappears by volatilization, such as ethanol, isopropylene alcohol, etc.;
A film made of polyethylene glycol alone may be formed on the tire surface.

In addition to ethylene glycol, there are also diethylene glycol and triethylene glycol among glycol-based drugs that contain polyethylene glycol, but ethylene glycol, diethylene glycol, and triethylene glycol, which have low molecular weights, do not blend uniformly on the tire surface. A good coating cannot be obtained.

In addition, the higher the molecular weight of polyethylene glycol, the better the adhesion to the tire surface, and the higher the polyethylene glycol, the stronger the gloss after drying. On the other hand, if the molecular weight exceeds 600, it will solidify at low temperatures, which will have an adverse effect on running performance, such as a decrease in grip. Therefore, the coating workability, low temperature properties, and molecular weight were determined to be in the range of 150 to 600.

Also, the miscibility ratio of the polyethylene glycol and alcohol is 4! If it is less than fit%, the polyethylene glycol film layer is thin and has little gloss, so the coating effect is lacking. On the other hand, if the mixing ratio exceeds 50% by weight, the gloss will be strong and the brightness will be uneven, giving the tire a different texture, and the number of times the coating agent must be wiped off after application will increase, resulting in poor workability. Therefore, the mixing ratio is 4 to 50% by weight, preferably 8 to 16%.
Weight % is continuous.

The coating agent is applied to the entire surface of the tire, including the tread and sidewall portions of the tire. Various methods can be used for application, including spraying with a spray gun, a brush wheel, or even dipping into a tank filled with a coating agent.

〔Example〕

(11 Examples 1 to 4, Comparative Examples 1 to 5 Examples 1 to 4 in which the polyethylene glycols shown in Table 1 have different fractions of -71, and ethylene glycol whose physical properties are relatively similar to polyethylene glycol (Comparative Example 1) , diethylene glycol (Comparative Example 2), triethylene glycol (Comparative Example 3), silicone wax conventionally used as a coating agent (Comparative Example 4), and uncoated fabric (Comparative Example 5) were selected for comparative testing. The results are shown in Table 2.

As a result of the comparative test, Examples 1 to 4 had a coating of 191
It was found that polyethylene glycol was superior in terms of film quality, as the film was maintained at 1% degree and the gloss was at the same level as silicone wax at low temperatures, whereas silicone wax solidified. No outdoor exposure for 3 weeks! 40 during exposure test
Due to intermittent rain, the coating of Comparative Example 4, in which silicone wax was applied, was washed out.

Further, in Examples 1 to 3, no swelling was observed in the rubber base material of the tire, and therefore, it was determined that there was no permeation of the coating liquid into the rubber base material.

(2) Examples 5 to 1 (1. Polyethylene glycol with a molecular weight of 300 (derived from chemical f
f1PEG#300), the mixing ratio with alcohol was changed as shown in Table 3, and the ease of workability and appearance were compared.

Note that an ethanol solution is used as the alcohol solution. Table 3: As the concentration of polyethylene glycol increases, the thickness of the coating layer also increases; however, if the coating layer is thick, the number of times of wiping increases and workability decreases. It was found that a concentration of 12% was optimal for both workability and appearance, but in all Examples 5 to 10, the function was maintained and a vine film was formed.

(3) Example 11.12, Comparative Examples 6-9 Tire size 1
4th regarding 10/90-18 and 100/90-16
We prototyped a tire with the coating agent shown in the table applied to the bead, and ran this tire on a drum to lower the internal pressure.The internal pressure and time during which the rim was running caused the rim to come off dynamically. A test was conducted. The tire running conditions at this time were to run at a speed of 5 km/h, a camber angle of 30 degrees, a slip angle of 50 degrees, and an initial internal pressure of 0.7 kg/-.

Example 11.12 shows the PEG #300 (molecule fi3
00) was applied with 12% Dosumi Konwa Shitachino in ethanol, and in Comparative Example 7.9, silicone wax was applied with spray L-・(
Sprayed by.

As a result of the test, the product of Example 11.12 had better resistance to rim detachment than the conventional product using silicone wax (Comparative Example 7.9), and the fabric without any coating agent remained (
Compared to Comparative Example 6.8), the rim detachment performance is slightly lower, but it is judged that there is no problem in practical terms because the internal pressure at that time is low.

(4) Example 13, Comparative Example 10 This is a static rim detachment evaluation in which a tire is assembled to a rim, a load is applied from the sidewall direction of the tire, and the resistance when rim detachment occurs is compared.

Example 13 used a coating agent in which PEG #300 (molecular weight 300) was mixed with ethanol in an amount of 33% by weight, and Comparative Example 10 used a tire as a fabric.

As shown in Table 5, the drag of Example 13 is slightly greater than that of Comparative Example 10, but it is judged that there is no problem in running the actual vehicle.

(5) The tires of Examples 14 and 15 and Comparative Example 11 were mounted on actual vehicles to compare grip performance during driving. When conventional coatings were used, slippage was likely to occur immediately after starting, so testing was conducted mainly immediately after starting.

As shown in Table 6, it was found that the grips of Examples 14 and 15 had a somewhat lower grip feeling, but had no problem with safety.

Note that the grip feeling of Example 4.15 was the same as that of Comparative Example 11 during continuous running after the second test.

〔Effect of the invention〕

As mentioned above, the tire of the present invention has a molecular weight of 150 to 600.
Because the alcohol solution of polyethylene glycol is applied to the tire surface, it does not interfere with the action of the anti-aging agent and wax contained in the tire, which means that it maintains the quality of the tire and prevents the tire from discoloring. , maintain its commercial value. In addition, unlike conventional products, the rim does not come off, and driving safety can be ensured.

It goes without saying that the tire of the invention can be applied to all types of tires, such as tires for motorcycles, passenger cars, aircraft, and even bicycles.

Procedural amendment (September 24, 1986, Commissioner of the Patent Office, Black 1) Aki Yu Interview +
y-series patent applicant address: 1-1-1-4, Tsutsui-cho, Kanten Chuo-ku, agent address: 4-2-26 Nishinakajima, Yodogawa-ku, Osaka (1) Akine word bud [Claims] ” Column 8. Inventory of attached signatures +11? amended claims
Claims (1) as amended: A tire characterized in that an alcohol solution of polyethylene glycol having a molecular weight of 150 to 600 is applied to the tire surface.

(2) The tire according to claim 1, wherein the alcohol solution of polyethylene glycol is a 4 to 50% by weight solution.

Claims (2)

[Claims] (1) A tire characterized in that an alcohol solution of polyethylene glycol having a molecular weight of 150 to 600 is applied to the tire surface. (2) The tire according to claim 1, wherein the polyethylene glycol is mixed in an alcohol solution in an amount of 4 to 50% by weight.