KR100807340B1 - Tread compound for aircraft tire - Google Patents

Abstract

A tread compound for aircraft tires is provided to be superior in wear-resistant performances and heat-resistant performances. A tread compound for aircraft tires includes 30-40 parts by weight of carbon black having an iodine adsorption number of 110-120 g/kg, a DBP adsorption number of 130-140 ml/100g, and a coloring rate of 115-125 % and 20-30 parts by weight of carbon black having an iodine adsorption number of 85-95 g/kg, a DBP adsorption number of 110-120 ml/100g, and a coloring rate of 110-120% based on 100 parts by weight of a base rubber.

Description

Tread compound for aircraft tire

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire tread rubber composition for an aircraft, and to a tire tread rubber composition for an aircraft having excellent wear resistance and heat resistance.

The heat and wear resistance of the tire tread rubber composition for aircraft is determined by the nature of the tread surface layer that moves in contact with the ground.The inevitable heat generation during takeoff and landing of the aircraft results in a drop in physical properties and abrasion resistance, and heat generation. The increase in temperature is causing the durability of the tire to decline.

As a way to solve the problems of the aircraft tire tread as described above, the heat resistance stability is improved by using an excessive amount of anti-aging agent having good heat resistance properties in the natural rubber compound or by changing the crosslinking agent into a single sulfur bond or a double sulfur bond rather than a multiple sulfur bond. Improvements have been made.

However, the above methods have a problem in that they have limitations in improving the tensile strength properties, the wear resistance and the exothermic performance, among other properties of rubber.

On the other hand, in the prior art related to the present invention, Korean Patent Laid-Open Publication No. 2006-0028340 discloses an aircraft tire having a tread portion structure in which end interference of a reinforcement cord is suppressed to reinforce an aircraft tread. In the prior art, in the aircraft tire provided with a plurality of reinforcement cords in the tread portion, the reinforcement cord (Reinforce cord) the edge of the edge (edge) so as not to touch each other to completely eliminate the interference phenomenon between the reinforcement cords at the ends of the reinforcement cord The present invention relates to an aircraft tire that can prevent separation at the end of the reinforcement cord while the tire is running.

Korean Patent Laid-Open Publication No. 2006-0005938 discloses an aircraft tire that improves durability by uniformly distributing the grounding pressure concentrated on the center rib of the tread to the shoulder rib, and prevents the wear of the tread center and the tread shoulder. .

However, the prior art is different from the technical configuration of the present invention showing the tire tread rubber composition for aircrafts having excellent wear resistance and heat resistance by using two kinds of carbon black having different properties as a reinforcement.

The present invention has been studied for a long time to solve and improve the problem of the tread rubber composition of the conventional aircraft tires as described above and ultimately have different characteristics to improve the wear resistance and heat resistance of the most important in the aircraft tires Two kinds of carbon blacks were used to obtain a tire tread rubber composition for an aircraft having excellent abrasion resistance and heat resistance.

Accordingly, an object of the present invention is to provide a tire tread rubber composition for an aircraft having excellent abrasion resistance and heat resistance.

In another aspect, the present invention is to provide an aircraft tire including a rubber made of the above-mentioned rubber composition.

In the tire tread rubber composition for aircrafts, 30-40 parts by weight of carbon black having iodine adsorption of 110-120 g / kg, DBP adsorption of 130-140 ml / 100g, and 115-125% coloration of iodine with respect to 100 parts by weight of raw rubber. The tire tread rubber composition for aircraft containing 20-30 weight part of carbon blacks whose adsorption is 85-95 g / kg, DBP adsorption 110-120 ml / 100g, and coloring degree 110-120% is shown.

The raw rubber may be any one selected from natural rubber, synthetic rubber, and mixed rubber mixed with natural rubber and synthetic rubber.

In the case of using the mixed rubber mixed with natural rubber and synthetic rubber as the raw material rubber, it is possible to use mixed rubber mixed with 5 to 95 parts by weight of natural rubber and 5 to 95 parts by weight of synthetic rubber from 100 parts by weight of raw rubber.

In the above synthetic rubber, one kind of synthetic rubber may be used as a raw material rubber, and raw synthetic rubber may be used as a mixed synthetic rubber in which two or more synthetic rubbers are mixed.

The synthetic rubber may be any one or more selected from styrene butadiene rubber, butadiene rubber, butyl rubber, halogenated butyl rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber including nitrile and neoprene rubber.

As an example of the raw material rubber, mixed rubber mixed with 60 to 100 parts by weight of natural rubber (NR) and 0 to 40 parts by weight of butadiene rubber (BR) in 100 parts by weight of raw material rubber may be used.

The aircraft tire rubber composition of the present invention may use two kinds of carbon black as a reinforcing agent.

In the carbon black, iodine adsorption is 110 to 120 g / kg, DBP adsorption is 130 to 140 ml / 100 g, coloring degree is 115 to 125%, and iodine adsorption is 85 to 95 g / kg, DBP adsorption is 110 to 120 ml / 100 g, coloring degree is 110 to 120%. Two kinds of carbon black can be used.

As described above, carbon black having iodine adsorption of 110 to 120 g / kg, DBP adsorption of 130 to 140 ml / 100 g and coloring degree of 115 to 125% may be used in an amount of 30 to 40 parts by weight based on 100 parts by weight of the raw material rubber.

The carbon black having iodine adsorption of 85 to 95 g / kg, DBP adsorption of 110 to 120 ml / 100 g and coloring degree of 110 to 120% may be used in an amount of 20 to 30 parts by weight based on 100 parts by weight of the raw material rubber.

In the rubber composition for aircraft tires of the present invention, the rubber composition for aircraft tires is applied under various conditions such as various components and contents. In order to achieve the object of the present invention, the rubber composition for aircraft tires is preferably used. I could see.

The rubber composition for aircraft tires of the present invention is suitable for various additives such as activators, anti-aging agents, process oils, vulcanizing agents, and vulcanization accelerators used in conventional rubber compositions for aircraft tires in addition to the above-mentioned raw rubber and carbon black. It can be selected and used in predetermined content. However, these are general components used in rubber compositions for conventional aircraft tires and thus are not essential components of the present invention.

The present invention includes the rubber produced by the rubber composition as described above.

The present invention includes an aircraft tire containing a rubber produced by the above-mentioned aircraft tire tread rubber composition.

The present invention includes an aircraft tire containing as a tread the rubber produced by the above-mentioned aircraft tire tread rubber composition.

Hereinafter, the present invention will be described by the following comparative examples, 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.

Comparative Example

50 parts by weight of carbon black, 2 parts by weight of process oil, 3.5 parts by weight of zinc oxide, 3 parts by weight of stearic acid, anti-aging agent (2,2,4-) 2.75 parts by weight of trimethyl-1,2-dihydroquinoline (RD) and 1 part by weight of wax were combined in a half-barrier mixer and released at a temperature of 155 ° C. Then, after standing at room temperature for 24 hours, 1.6 parts by weight of sulfur and a vulcanization accelerator (N- Cyclohexyl-2-benzothiazolsulfen amide (CZ) 1.05 parts by weight were added to the above-mentioned banbari mixer containing the rubber compound and blended and vulcanized at 105 ° C. to prepare a rubber specimen.

In the above, iodine adsorption was 80g / kg, DBP adsorption was 72ml / 100g, the coloration of 112% was used.

<Example 1>

32 parts by weight of carbon black (A), 23 parts by weight of carbon black (B), 2 parts by weight of process oil, 3.5 parts by weight of zinc oxide, stearic acid based on 100 parts by weight of the raw material rubber consisting of 95 parts by weight of natural rubber and 5 parts by weight of butadiene rubber 3 parts by weight, 2.75 parts of anti-aging agent (RD) and 1 part by weight of wax were mixed in a half-barrier mixer and released at a temperature of 155 ° C., and then 1.6 parts of sulfur and a vulcanization accelerator (CZ) 1.05 after standing at room temperature for 24 hours. The parts by weight were added to the half-barrier mixer containing the rubber compound and blended, and cured at 105 ° C. to prepare a rubber specimen.

In the carbon black (A), reinforcing carbon black having iodine adsorption of 115 g / kg, DBP adsorption of 135 ml / 100 g, and coloring degree of 120% was used.

Carbon black (B) was used as a reinforcing carbon black iodine adsorption 90g / kg, DBP adsorption 114ml / 100g, the coloring degree 115%.

<Example 2>

A rubber specimen was manufactured in the same manner as in Example 1, except that 100 parts by weight of the raw material rubber consisting of 90 parts by weight of natural rubber and 10 parts by weight of butadiene rubber were used.

<Example 3>

A rubber specimen was manufactured in the same manner as in Example 1, except that 100 parts by weight of the raw material rubber consisting of 80 parts by weight of natural rubber and 20 parts by weight of butadiene rubber were used.

Table 1. Compositions of Comparative Examples and Examples

Furtherance Comparative example Example 1 Example 2 Example 3 caoutchouc 100 95 90 80 Butadiene rubber - 5 10 20 Carbon black * 50 - - - Carbon black (A) - 32 32 32 Carbon black (B) - 23 23 23 Process oil 2 2 2 2 Zinc oxide 3.5 3.5 3.5 3.5 Stearic acid 3 3 3 3 Anti aging agents 2.75 2.75 2.75 2.75 Wax One One One One brimstone 1.6 1.6 1.6 1.6 Vulcanization accelerator 1.05 1.05 1.05 1.05

* Reinforcement carbon black with iodine adsorption 80g / kg, DBP adsorption 72ml / 100g, coloration 112%

Carbon black (A): reinforcing carbon black with iodine adsorption of 115 g / kg, DBP adsorption of 135 ml / 100 g and coloration of 120%

Carbon black (B): reinforcing carbon black with iodine adsorption of 90 g / kg, DBP adsorption of 114 ml / 100 g and coloring degree of 115%

<Test Example>

The rubber specimens prepared in Examples and Comparative Examples were subjected to fairness (viscosity, scorch time (t5)), tensile properties before and after aging (hardness, 300% modulus, tensile strength, elongation), and heat resistance according to ASTM-related regulations. Physical properties such as heat build-up, blow out, rebound, wear and cut and chip characteristics were measured and the results are summarized in Table 2 below.

Table 2. Comparative Examples and Examples Properties of Rubber Specimens

Item Comparative example Example 1 Example 2 Example 3 Fairness Viscosity 46 53 55 56 Scorch time (t5) 15.1 17.8 18.7 19.0 Tensile Properties (Before Aging) Shore A 62 66 68 69 300% modulus (kg / cm ² ) 145 185 198 205 Tensile Strength (kg / cm ² ) 288 293 305 315 Elongation (%) 494 463 442 431 Tensile Properties (5 Days Aging at 105 ° C) Shore A 67 71 73 74 300% modulus (kg / cm ² ) 185 205 230 238 Tensile Strength (kg / cm ² ) 206 239 248 254 Elongation (%) 328 340 323 315 Heat resistance (℃) 24.0 18.5 19.2 20.4 Blow Out (hr) 10.5 14.6 14.3 13.8 Rebound (%) 45.61 42.85 42.98 43.45 Wear characteristics (index) 100 110 121 136 Cut and Chip Characteristics (Index) 100 110 105 104

Heat build-up in the measurement of physical properties of Table 2 is a method of measuring the elevated temperature by applying a constant stroke to the specimen using a hysteresis tester manufactured by Perry Machinery. Indicates. In other words, the value is obtained from the temperature difference between the initial specimen temperature and the final temperature.

In the measurement of physical properties of the above Table 2, the wear characteristics are non. F. This test is carried out by pressing the upper part of the rotating blade using the BF Goodrich abrasion tester. The value is calculated by the difference between the weight of the original specimen and the weight of the specimen after the test. The higher the wear resistance, the greater the wear resistance, and the longer the tire wears. On the other hand, in the results of Table 2, the wear characteristic values of Examples 1 to 3 were converted when the measured value of the comparative example was set to 100, and the higher the value, the better the wear characteristic.

In the measurement of the physical properties of Table 2, the cut-and-chip characteristics are non. F. The BF Goodrich cut & chip tester is used to perform the test while lowering the sharp blade rotating specimen at a constant speed. The smaller the difference between the original specimen weight and the specimen weight after the test is, the better the performance. This is excellent. On the other hand, in the results of Table 2, the cut and chip characteristic values of Examples 1 to 3 were converted when the measured value of the comparative example was set to 100, and the higher the value, the better the wear characteristics.

As shown in the results of Table 2, the rubber of Examples 1 to 3 of the present invention can be seen that the wear resistance and heat resistance excellent compared to the rubber of the conventional comparative example.

Claims (3)

In the tire tread rubber composition for aircraft, 30 to 40 parts by weight of carbon black with iodine adsorption at 110 to 120 g / kg, DBP adsorption at 130 to 140 ml / 100 g, coloring degree 115 to 125%, iodine adsorption at 85 to 95 g / kg, and DBP adsorption to 110 to 120 ml A tire tread rubber composition for aircrafts, comprising 20 to 30 parts by weight of carbon black having a color ratio of 110 to 120%. According to claim 1, 32 parts by weight of carbon black having iodine adsorption at 115 g / kg, DBP adsorption at 135 ml / 100 g, coloring degree 120% and iodine adsorption at 90 g / kg, DBP adsorption 114 ml / 100 g, and coloring degree 115% with respect to 100 parts by weight of raw material rubber. A tread rubber composition for an aircraft, comprising 23 parts by weight of phosphorus carbon black. An aircraft tire comprising a rubber comprising the rubber composition of claim 1.