KR100964313B1 - Innerliner Rubber Composition for Aircraft - Google Patents

Abstract

The present invention relates to an airplane tire inner liner rubber composition, and more particularly, in an aircraft tire inner liner rubber composition, natural rubber is used as a raw material rubber, and carbon black 20 to 30 parts by weight based on 100 parts by weight of the raw material rubber. The present invention relates to an inner liner rubber composition for an aircraft tire that can improve air permeability and cold resistance by including 20 to 30 parts by weight of a plate-type inorganic filler, 1 to 5 parts by weight of zinc oxide, and 5 to 15 parts by weight of paraffinic oil.

Inner Liner, Aircraft, Air Permeability, Cold Resistance

Description

Innerliner Rubber Composition for Aircraft

The present invention relates to an airplane tire inner liner rubber composition, and more particularly, in an aircraft tire inner liner rubber composition, natural rubber is used as a raw material rubber, and carbon black 20 to 30 parts by weight based on 100 parts by weight of the raw material rubber. The present invention relates to an inner liner rubber composition for an aircraft tire that can improve air permeability and cold resistance by including 20 to 30 parts by weight of a plate-type inorganic filler, 1 to 5 parts by weight of zinc oxide, and 5 to 15 parts by weight of paraffinic oil.

Most of the tires such as automobile tires, truck tires, and aircraft tires have an inner liner portion.

Among them, cold resistance and air permeability are important issues in the inner liner rubber of an airplane tire, and improving these characteristics is related to the safety of the entire aircraft.

In the conventional inner liner rubber composition of aircraft tires, butyl rubber is mainly used alone as a raw material rubber, or mixed rubber in which a small amount of other rubber is mixed is used.

That is, butyl rubber has good air permeability and is used as a raw material rubber for innerliner for most tires such as automobile tires, truck tires and aircraft tires.

Butyl rubber has good air permeability, while cold resistance is not very good.

On the other hand, the aircraft flies over 8,000 ~ 9,000m when flying and the temperature is around -50 ℃. Therefore, the tire should also be able to withstand the cold, and the inner liner of the tire for the aircraft should not only be air permeable but also excellent in cold resistance.

However, butyl rubber having poor cold resistance as above is mainly used for innerliner as a raw material rubber, but other additives are used to solve this problem, but not only causes an increase in cost due to such additives, but an excessive amount of additives. There is a fear that the properties of the aircraft innerliner may decrease.

Accordingly, the present invention is to provide an aircraft inner liner rubber composition having good air permeability and excellent cold resistance even at a low temperature for a long time.

The present invention is to provide an air vehicle tire inner liner rubber composition that maintains air permeability and excellent cold resistance even at low temperature for a long time even when using natural rubber as raw material rubber.

The present invention seeks to provide an aircraft tire comprising a rubber consisting of the above mentioned rubber composition and / or a rubber consisting of the above mentioned rubber composition.

The present invention is to use the natural rubber as the raw material rubber in the aircraft tire inner liner rubber composition, 20 to 30 parts by weight of carbon black, 20 to 30 parts by weight of plate-shaped inorganic filler, zinc oxide 1 ~ It is to provide an aircraft tire innerliner rubber composition that can improve the air permeability and cold resistance by including 5 parts by weight, 5 to 15 parts by weight of paraffinic oil.

In addition, the present invention is to provide an aircraft tire comprising a rubber made of the above-mentioned rubber composition and / or rubber made of the above-mentioned rubber composition.

Advantageous Effects of Invention The present invention can provide an aircraft tire inner liner rubber composition having excellent air permeability and cold resistance as compared to the conventional inner liner rubber composition.

The present invention relates to an aircraft tire innerliner rubber composition having improved air permeability and cold resistance.

The present invention is to use the natural rubber as the raw material rubber in the aircraft tire inner liner rubber composition, 20 to 30 parts by weight of carbon black, 20 to 30 parts by weight of plate-shaped inorganic filler, zinc oxide 1 ~ The inner liner rubber composition for aircraft tires containing 5 weight part and 5-15 weight part of paraffinic oils is shown.

The aircraft tire inner liner rubber composition of the present invention may use natural rubber as the raw material rubber.

The aircraft tire inner liner rubber composition of the present invention may use natural rubber as a raw material rubber to improve air permeability and cold resistance.

The aircraft tire innerliner rubber composition of the present invention may use carbon black as a filler.

The aircraft tire innerliner rubber composition of the present invention may use 20 to 30 parts by weight of carbon black based on 100 parts by weight of the raw material rubber as a filler to improve the reinforcement of the rubber composition.

Carbon black may be used as the iodine adsorption value of 35 ~ 45mg / g.

Carbon black may be a dibutyl phthalate (DBP) absorption of 115 to 125ml / 100g.

In the carbon black, an iodine adsorption value of 35 to 45 mg / g and a dibutyl phthalate (DBP) absorption amount of 115 to 125 ml / 100 g may be used.

The aircraft tire inner liner rubber composition of the present invention may use a plate-type inorganic filler to improve air permeability.

The aircraft tire inner liner rubber composition of the present invention may use 20 to 30 parts by weight of the plate-shaped inorganic filler with respect to 100 parts by weight of the raw material rubber to improve air permeability.

The plate-type inorganic filler may be laminated in the longitudinal direction during extrusion and rolling into the plate-shaped to hinder the flow of air or to extend the air flow path to improve the air permeability of the inner liner rubber.

The plate-type inorganic filler may be any one or more selected from the group consisting of crystal graphite, mica, carbonate, calcium carbonate, talc, vermiculite, and hydrotalcite.

In the above-described flat plate-shaped inorganic fillers, any one or more selected from crystal graphite, mica, calcium carbonate, talc, vermiculite, and hydrotalcite may be used, and the particle size may be 0.1-20 μm.

The plate-shaped inorganic filler may be any one or more selected from crystalline graphite, mica, calcium carbonate, talc, vermiculite, and hydrotalcite, and an interlayer spacing of 0.1 to 10 nm may be used.

The inorganic plate filler is any one or more selected from crystalline graphite, mica, calcium carbonate, talc, vermiculite, and hydrotalcite, and has an aspect ratio (l / r) indicating a ratio of a plane width (l) to a thickness (d). d) is 5 or more may be used.

The plate-type inorganic fillers may be any one or more selected from crystal graphite, mica, calcium carbonate, talc, vermiculite, and hydrotalcite, and have a flat ratio of 5 to 100.

The plate-type inorganic filler is any one or more selected from crystalline graphite, mica, calcium carbonate, talc, vermiculite, hydrotalcite, particle size of 0.1 to 20㎛, interlayer spacing of 0.1 to 10nm, flat ratio of 5 to 100 Can be used.

In the present invention, the paraffinic oil has 50% or more of carbon in the paraffinic side chain, preferably 50 to 90%, and thus has low reactivity and is very stable. Can be improved.

The paraffinic oil may be 5 to 15 parts by weight of paraffinic oil, preferably 10 parts by weight, based on 100 parts by weight of the raw material rubber.

Meanwhile, the zinc oxide used as one of the activators in the aircraft tire inner liner rubber composition of the present invention may be used in an amount of 1 to 5 parts by weight, preferably 3 parts by weight, based on 100 parts by weight of the rubber material.

Investigation of the various components and contents of the aircraft tire inner liner rubber composition of the present invention, in order to solve the problem of the present invention, it is preferable to provide the aircraft tire inner liner rubber composition under the above-mentioned conditions.

The present invention requires various additives such as activators, process oils, anti-aging agents, vulcanizing agents, and vulcanization accelerators used in conventional aircraft tire inner liner rubber compositions in addition to the above-mentioned raw rubber, carbon black, plate-type inorganic fillers, and paraffinic oils. Depending on the enemy can be used in a predetermined amount. However, these are general components used in conventional tire tire rubber compositions and are not essential components of the present invention.

The present invention includes a rubber composed of the above-mentioned rubber composition.

The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition.

The present invention includes a tire containing, as an innerliner, a rubber composed of the above-mentioned rubber composition.

The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition, wherein the tire represents an aircraft tire.

Hereinafter, the present invention will be described by the following examples, comparative examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.

≪ Example 1 >

Natural rubber is used as a raw material rubber, and 30 parts by weight of carbon black, 20 parts by weight of crystal graphite (Crystal Grphite), 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, and 10 parts by weight of paraffinic oil, based on 100 parts by weight of the raw material rubber. Put in a mixer and blended for 5 minutes at 140 ℃ to obtain a rubber compound.

0.65 parts by weight of sulfur as a vulcanizing agent and 0.7 parts by weight of vulcanization accelerator (N-t-butylbenzothiazole sulfenamide, NS) were added to the rubber compound, and blended at 100 ° C. for 3 minutes to prepare a rubber.

In the carbon black, an iodine adsorption value of 40 ± 5 mg / g and a dibutyl phthalate (DBP) absorption amount may be used as 120 ± 5 ml / 100 g.

<Example 2>

Rubber was prepared in the same manner as in Example 1, except that 20 parts by weight instead of 30 parts by weight of carbon black was used, and 30 parts by weight instead of 20 parts by weight of crystal graphite.

Comparative Example 1

50 parts by weight of carbon black, 3 parts by weight of zinc, 3 parts by weight of stearic acid, and 10 parts by weight of aroma oils were placed in a Banbury mixer, based on 100 parts by weight of raw material rubber consisting of 10 parts by weight of natural rubber and 90 parts by weight of butyl rubber. It was blended for 5 minutes to obtain a rubber compound.

0.65 parts by weight of sulfur and 0.7 parts by weight of vulcanization accelerator (NS) were added to the rubber compound as a vulcanizing agent, and blended at 100 ° C. for 3 minutes to prepare a rubber.

In the carbon black, an iodine adsorption value of 40 ± 5 mg / g and a dibutyl phthalate (DBP) absorption amount may be used as 120 ± 5 ml / 100 g.

Table 1. Composition of Examples and Comparative Examples

Item Comparative example Example 1 Example 2 Natural rubber 10 100 100 Butyl rubber 90 - - Carbon black 50 30 20 Crystal graphite 0 20 30 Zinc oxide 3 3 3 Stearic acid 2 2 2 Paraffinic oil - 10 10 Aromatic oils 10 - - brimstone One One One Vulcanization accelerator 0.7 0.7 0.7

<Test Example>

The rubber specimens prepared in Examples 1 and 2 and Comparative Examples were measured for physical properties such as viscosity, hardness, 300% modulus, tensile strength, elongation, GPT transmission coefficient, cold resistance, etc. according to ASTM-related regulations. Table 2 summarizes them.

Table 2. Properties of Rubbers of Examples 1 and 2 and Comparative Examples

division Comparative example Example 1 Example 2 Viscosity (100 ° C) 50 47 44 Scorch Time 23 21 21 Hardness (shore A) 56 57 57 300% modulus 25 25 24 The tensile strength 81 79 78 Elongation 796 801 796 G.P.T Transmission Coefficient * 118.83 106.21 83.9 Cold resistance (℃) Brittle Temperature = -38 Brittle Temperature = -55 Brittle Temperature = -61

* The basis for calculating the G.P.T transmission coefficient is transmittance (CC / ㎡.atm.day) × thickness (mm), and the measurement conditions are 4psi and 60 ℃.

As shown in the results of Table 2, the rubber of Examples 1 and 2 showing the rubber of the present invention was found to be excellent in air permeability and cold resistance compared with the rubber of the comparative example made of a rubber composition for the inner liner.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

It can be seen that the inner liner rubber composition prepared according to the present invention has excellent air permeability and cold resistance as compared with the conventional inner liner rubber composition.

Claims (5)

In the aircraft tire innerliner rubber composition, 20 to 30 parts by weight of carbon black, which uses natural rubber as raw material rubber and has an iodine adsorption value of 35 to 45 mg / g and a dibutyl phthalate (DBP) absorption amount of 115 to 125 ml / 100 g based on 100 parts by weight of the raw material rubber; A plate-shaped inorganic filler having a particle size of 0.1 to 20 μm and an interlayer spacing of 0.1 to 10 nm is used, wherein the plate-shaped inorganic filler is selected from the group of crystal graphite, calcium carbonate, talc, vermiculite, and hydrotalcite. 20-30 parts by weight of one or more; And An inner liner rubber composition for an aircraft tire, comprising: 5 to 15 parts by weight of paraffinic oil, wherein carbon of the paraffin side chain is 50 to 90% of all carbon to improve the cold resistance of the rubber. delete delete Rubber consisting of the rubber composition of claim 1. An aircraft tire comprising a rubber comprising the rubber composition of claim 1.