JPS5915949B2 - Lubricating anti-puncture layer of tires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention applies a special product as a sealant to the inner surface of a pneumatic tire to prevent packs caused by damage caused by needles such as nails and glass. If the air escapes due to this reason, the above substance becomes fluid due to internal frictional heat and becomes a lubricant, preventing early tire destruction and making it possible to drive a little. The purpose is to provide layers.

Conventionally, in order to prevent pneumatic tires from being packed, if a needle such as a nail penetrates, especially when driving at high speed, if the penetrating nail is blown off by centrifugal force, 15 atmospheres of air will suddenly leak, causing a major accident. It was an incentive to do so.

In addition, if the tires are moved as they are, the frictional heat generated by the mutual friction between the inner layers of the tires and the load pressure will cause the tires to break, and such accidents during transportation are extremely embarrassing. The present invention forms a lubricating pack prevention layer that prevents these sudden accidents and allows for smooth post-treatment, and has the ability to fill through holes and have lubricating properties.

25 Next, the lubricant pack prevention layer of this tire will be described in detail.

This lubricious pack prevention layer is prepared by adding or not adding one or a mixture of two or more commonly used chain extenders to one or a mixture of two or more of polyether polyols and polyester polyols. 100 parts by weight of the polyol obtained, an amount of polyisocyanate to make the chemical equivalent approximately equal, and 10 parts of a plasticizer or softener having a boiling point of 120'C or higher and compatible with the above component mixture.
It is obtained by mixing, stirring, and reacting the above components using 0 to 35,600 parts by weight and a catalyst and a stabilizer as necessary.

Further, a prepolymer is prepared by reacting a part of the polyol and a polyisocyanate in advance, and this is used to obtain the above-mentioned total component composition. The product obtained in this way is applied as a sealant to the inner surface of a pneumatic tire to prevent punctures caused by damage from nails, glass, etc., and in the event that the air escapes, it can be applied to the inner surface of a pneumatic tire. It serves as a lubricant with suitable fluidity, prevents premature tire destruction, enables a certain degree of running, and facilitates post-treatment.

Reference will now be made to each component of the composition that produces this lubricious puncture protection layer.

(4) Polyols (a) Polyether polyol 1 molecular weight is 700 to 100,001, preferably 1,000
The 0 hydroxyl value of the polyoxyalkylene polyol having a value of 6,000 or less is generally 250 or less, preferably 25
~175.

These polyoxyalkylene polyols are obtained, for example, by using a polyhydric alcohol as an initiator and subjecting a single alkylene oxide or a mixture of alkylene oxides to an addition reaction under an alkali catalyst.

Typical examples of this polyhydric alcohol include glycol, glycerin, trimethylolpropane, pentaerythritol, propylene glycol, and butylene glycol, and alkylene oxides include, for example, ethylene oxides, such as propylene oxide, butylene oxide, and epichlorohydrin.

2 copolymer systems, such as polypropylene glycol.
It is a copolymer-based polyether polyol such as styrene copolymer and polypropylene glycol/acrylonitrile copolymer.

(b) Polyester polyol The 0H component used to synthesize this is preferably a polyhydric aliphatic alcohol, such as ethylene glycol, dipropylene glycol, diethylene glycol, glycerol, pentaerythritol, and trimethylolpropane. It is something.

Examples of the 000H component include succinic acid, adipic acid, sebacic acid, azelaic acid, and aromatic phthalic acid, terephthalic acid, and isophthalic acid.

It is a polyester polyol obtained by dehydration condensation of each component or a mixture of the above components, and its average functional group is 2.
-4, average molecular weight is 700-10000, preferably 1
000-6000.

(c) In the case of a mixture of these long chain polyols and a chain extender, the average active hydrogen value converted to 0H group value is 20 to 500.
, preferably 80-300.

8 Chain extenders are polyfunctional polyols such as aliphatic and aromatic, and polyamines.

For example, typical examples include ethylene glycol, propylene glycol, butylene glycol, glycerin, trimethylolpropane, pentaerythritol, hydrazine, hydrazine hittride, MOCA [4,4'
-methylene-bis(2-chloroaniline)] o(O polyisocyanates, for example, 2,4- or 2,6-
- Tolylene diisocyanate single substance or mixture, hexamethylene diisocyanate, methylene-bis(4-phenyl isocyanate) (abbreviation MDI), liquid modified MDI
Examples include 1-naphthalene-1,5-diisocyanate and polyphenylene polymethylene isocyanate.

The above components are obtained by stirring, mixing, and reacting as described above.

Examples Tables 1 and 2 below show examples of compositions for forming the lubricating anti-puncture layer of the tire of the present invention.

The reaction time for the compositions shown in Tables 1 and 2 above is 500C x 6
It is 0 minutes. The properties of the obtained product are shown in Table 3. The obtained product was used as a sealant, size 5.60-1
An internal pressure leak test was conducted when a nail penetrated and when a nail was pulled out when a puncture prevention layer was applied to a 3.4 PR pneumatic tire to a predetermined thickness. The test method is to apply 1,
Applying an internal pressure of 7Kf/Cd to the center of the tielet,
Table 4 shows the results of an internal pressure leak test in which various nails of different diameters were forced through the test machine using an Amsura type 1 testing machine, and in the state in which the nails were pulled out.

As shown in the table above, depending on the formulation, a wide range of products can be obtained, from elastic gels to relatively soft loose gels and even softer liquids, and the colors and colors vary depending on the conditions of use. Although materials with various properties can be used, a soft material with limited to a soft elastic material or a gel-like material is preferable.
Note that liquid materials are not preferred because they are difficult to form a layer in practice, and are therefore suitable for mixed use or when lubricity is the main objective. As shown in the examples above, it has an excellent effect of sealing the through hole.

Claims (1)

[Claims] 1 Polyol 10 of one type or a mixture of two or more of polyether polyols and polyester polyols
0 parts by weight, polyisocyanate in an amount that makes the chemical equivalent approximately equal, and 100 to 500 parts by weight of a plasticizer or softener having a boiling point of 120 ° C. or higher, which is compatible with the above components.
A lubricating anti-puncture layer for tires in which the resulting product is added to the inner surface of the tire using catalysts and stabilizers if necessary. 2. For 100 parts by weight of a polyol obtained by adding one or more chain extenders to one or more mixtures of polyether polyols and polyester polyols, add an amount of polyol that makes the chemical equivalent approximately equal. Tire lubricity by adding to the inner surface of the tire a product obtained by using isocyanate, 100 to 500 parts by weight of a compatible plasticizer or softener having a boiling point of 120°C or higher, and optionally a catalyst and stabilizer. Puncture protection layer.