JPS5822363B2 - Annensei Tire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tire that runs on nails, which is made by injecting and hardening urethane nystomer containing a large amount of water instead of air into an automobile or bicycle tire.

The purpose of this invention is to provide a safety tire suitable for special uses that can be easily obtained at low cost.

Conventionally, as a measure to prevent punctures of pneumatic tires, various composition layers have been formed on the inner surface of the pneumatic tire, but the formation requires a lot of work and is expensive, and is difficult to handle. It was inconvenient, lacked simplicity, and was impractical.

Therefore, in the present invention, a water-soluble urethane prepolymer is used, which is cross-linked and cured with water, and a gelled product containing a large excess of water in the nidistomer is formed and heated inside the pneumatic tire. It is.

This water-soluble urethane prepolymer (abbreviated as prepolymer)
For example, polyethylene glycol is used alone or as a main component as a polyol, and its molecular weight is 1.
It is preferably about 000 to 5000, and is based on a compound having an incyanate group at the end group obtained by combining it with a polyisocyanate, and if necessary, a reaction accelerator (-!: or retarder) is used as a base. agent), plasticizer, filler,
It contains pigments, anti-discoloration agents, anti-aging agents, foam stabilizers (or anti-foaming agents), etc.

When this prepolymer is mixed with a large excess of water, a small portion of it reacts with incyanate groups, crosslinks, and becomes a di-distomer, and unreacted water is uniformly hydrated within the di-distomer. The result is a flexible gelled substance, ie, an agar-like substance.

To form such a substance in a pneumatic tire, remove the tube of the pneumatic tire, attach it to the rim, seal the area with plugging material if necessary, and close the valve hole attached to the rim. You can inject it using a , or put the tube in a New March tire and attach it to the rim.
Inject into the tube using the removed valve hole.

After injection, the valve is placed to allow air to enter.

Conventionally, the prepolymer/water ratio of this injection solution containing a water-soluble urethane prepolymer and a large amount of water is 115 to 1/20.
Previously, a mixture in the range of 1/8 to 1/17 was used, but as a result of extensive research, we discovered that a mixture in the range of 1/1 to 115o is also effective as a safe tire. I ended up doing it.

Conventionally, when the polymer/water ratio was between 1/1 and 115, foaming and shrinkage occurred, making the light unsuitable for practical use. However, by reducing the amount of reaction accelerator in the polymer, the amount of plasticizer, filler, etc. By adjusting the temperature and conducting the reaction at a lower temperature than room temperature (20°C to 25°C), we succeeded in forming an elastic foamy urethane compound.

In addition, if there was a large excess of water than 1/20, the elasticity would be lost and there would be problems with durability, so it was considered unsuitable.
Even within the range of /20 to 1150, safety was confirmed when driving at low speeds of 60 km/hr or less and when riding a bicycle.

In addition, this injection method involves mixing the prepolymer and water in a predetermined ratio within the above range and using a one-component injection machine, or
Alternatively, using a two-component injection machine, water and prepolymer are placed in separate tanks and continuously mixed and injected inside the injection machine, or other suitable pumps are used to inject the water and prepolymer.

In the case of injection, it is preferable to thicken the water to about 100 cp with a thickener (for example, carboxymethyl cellulose, etc.) in advance.

In particular, when the polymer/water ratio is in the range of 1/20 to 1150, it is desirable to add a large amount of thickener to thicken the viscosity and increase the boiling point.

Infusion fluid. If the boiling point of the tire is close to 100°C, which is the boiling point of water, the tire is likely to be damaged during driving (because the internal heat generation temperature of the tire during running is around 120°C).

For these reasons, it is necessary to adjust the amount of thickener so that the boiling point of the injection solution is as high as 120°C or higher.Examples will now be described.

Example 1 (a) Preparation weight part of water-soluble urethane prepolymer (abbreviated as prepolymer), FA-103・・・・・・・・・・・・・・・・・・
...100 (manufactured by Sanyo Kasei Co., Ltd., polyethylene/polypropylene glycol, molecular weight 3300) Tolylene diisocyanate (TDI-8o) ...16
The above proportions were charged into a synthesis tank, reacted at 80°C for 3 hours, and after cooling, modified dimethylolpolysiloxane 0.
Add 3%.

It is a viscous liquid with free NC0% of about 3.5%.

(b) Preparation of tires Prepare 65Q-10 tires with tubes and tires without tubes.

(c) Injection Using the above prepolymer, the prepolymer/water ratio is 1
/8, stir quickly, tire without tube 650
-10 was pressurized using a 3:1 president pump manufactured by Nippon Brake Co., Ltd.

The injection amount was approximately 21 kg.

(d) Driving test A tire obtained by injecting and curing a mixed composition in which the ratio of the water-soluble urethane prepolymer and water is within the range of 1/8 in place of the air in the above 650-10 pneumatic tire. To do this, we used a test tire in which six nails with a length of 5 ohm and 7 m were intentionally driven into the tread and a conventional pneumatic tire, one on each side of the forklift.
As a result of measurement after 10 days, no abnormality was observed, and the product has been used successfully since then.

(e) Comparison of load bearing capacity and deformation In tire size 650-10, the prepolymer/water ratio is in the range of 1/1 to 1150 and is conventionally used as a urethane nystomer-filled tire containing a large amount of water. We compared the load and deformation with a tube sinewmatic tire.

The results are shown in Tables 1 and 2.

The test method was to attach the tire to the shaft, load it with an Amsler type universal testing machine, compress it by 10%, and compress it by 20%.
The load required for % compression was measured.

As is clear from the above measured values, the filled tire of the present invention and the conventional pneumatic tire have the characteristics of having almost the same load bearing capacity and the same amount of deformation.

Example 2 (a) Synthesis of prepolymer polyethylene/polypropylene glycol (molecular weight 3
000) 86 parts polyethylene glycol (molecular weight 1500) 14 parts tolylene diisocyanate (TD■) 16 parts The above ratio was charged into a synthesis tank, reacted at 800C for 3 hours, and after the reaction was completed, it was cooled and methyl ethyl ketone was added to reduce the solid content to 90. % and add 0.3% of modified dimethylolpolysiloxane.

(b) Tire preparation 26-inch commercially available bicycle tire (c) Injection The above prepolymer and water containing 10% ethylene glycol were quickly stirred at a ratio of 1/30.
It was injected into a bicycle tire tube using a trochoid pump TOP-203HG (manufactured by Bhon Oil Pump).

The total injection volume decreased by 9 to 1.55.

(d) Static load test (foot pattern area) (e
) Trend test (accompanying test) *: Mileage distance when running on the drum and stopping the drive (larger number is preferable) As is clear from the above two examples, the filled tire of this invention and the conventional pneumatic tire It is an important advantage of the present invention that the two have the same load bearing capacity and running stability, and the same amount of deformation.

This means that even though it is a filled tire like a solid tire, it can provide the same level of riding comfort as a pneumatic tire.

In addition, it is low cost because it uses a large amount of water, and the productivity is high because the gelation reaction rate is on the order of minutes. It has many advantages in terms of gender.

Claims (1)

[Claims] 1. A water-soluble urethane prepolymer obtained from polyethylene glycol or a polyol containing polyethylene glycol as a main component and polyincyanate. The ratio of the urethane prepolymer to water is 1/1 to
A urethane gelatinized composition within the range of 1150 is injected into a tire or tube instead of air in a pneumatic tire to form an agar-like cured product uniformly hydrated. safety tires.