KR20070035837A - The apex rubber compound with improved tack - Google Patents

Abstract

The present invention relates to a rubber composition for tire apex containing a natural rubber having a Mooney viscosity of 55 to 65 and STRUKTOL-40MS (dispersant), and a natural rubber having a Mooney viscosity of 55 to 65 and a STRUKTOL-40MS. (Dispersant) improves the adhesiveness of the airpex compound, and thus has an effect of improving ride comfort and steering stability.

The present invention is a rubber composition for tire apex, comprising a rubber composition for apex which can improve the adhesiveness of the airpex compound by containing a natural rubber having a Mooney viscosity of 55 ~ 65 and STRUKTOL-40MS (dispersant). It is aimed at the provision of the tire.

The rubber composition for tire apex of the present invention contains 1 to 3 parts by weight of STRUKTOL-40MS (dispersant) based on 100 parts by weight of the raw material rubber consisting of natural rubber having a Mooney viscosity of 55 to 65 and butadiene rubber.

Apex, STRUKTOL-40MS (dispersant)

Description

Rubber composition for tire apex with excellent adhesion {The apex rubber compound with improved tack}

The present invention relates to a rubber composition for apex that plays a role of supporting carcass in a tire bead area and plays a decisive role in ride comfort and steering stability, and more specifically, Mooney viscosity of 55 ~ The present invention relates to an apex rubber composition containing 65 natural rubber and a process aid STRUKTOL-40MS (dispersant) to improve adhesiveness.

The apex part of a car tire supports carcass at the bead part of a tire and mitigates the impact of the bead part. The rubber used in this part requires physical properties such as heat aging resistance, excellent adhesion and high hardness. do. Therefore, a large amount of fillers and reinforcing resins are used, which impairs processability, and in particular, lowers adhesive performance. To compensate for this, various rosin-based, terpene-based, petroleum resin-based, coal tar-based, alkyl phenol-based tackifiers, and the like are used.

However, if a certain amount of the tackifier is used to improve the performance of the tack, the viscosity decreases a lot, which does not satisfy the strong hardness, which is the required performance of Apex. Several methods and patents have been applied to solve this problem. Among them, there is Korean Patent Application No. 2003-97689, and it is specified that the adhesiveness is improved by using the adhesive KPA 1350 and the dispersant STRUKTOL-40MS.

The present invention has been proposed in order to solve the problems of the prior art as described above, an object of the present invention is to include a STRUKTOL-40MS (dispersant) in the apex rubber composition for tires for the tire to improve the adhesiveness of the existing airpex compound It is to provide an apex rubber composition.

In order to achieve the above object, the present invention relates to an apex rubber composition comprising 1 to 3 parts by weight of a STRUKTOL-40MS (dispersant) based on 100 parts by weight of a raw material rubber in an apex rubber composition for tires.

In the present invention, the raw material rubber may be used alone as a natural rubber having a Mooney viscosity of 55 to 65. In addition, when using 100 parts by weight of the raw material rubber in the present invention it can be used a mixed rubber consisting of 50 to 95 parts by weight of natural rubber having a Mooney viscosity of 55 to 65 and 5 to 50 parts by weight of synthetic rubber.

As one example of the synthetic rubber, any one or more selected from styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber, isoprene rubber, and halobutyl rubber may be used.

The present invention includes a tire containing an apex rubber made of the above rubber composition. In this case, the tire represents any one selected from a tire for a vehicle, a tire for a truck, and a tire for a bus.

In the present invention, it was intended to improve the adhesiveness by including a natural rubber having a Mooney viscosity of 55-65 and a process aid STRUKTOL-40MS (dispersant) in the Apex rubber composition.

The rubber composition for apex plays a decisive role in supporting the carcass in the tire bead area and in the ride comfort and the steering stability.

Raw material rubber used in the Apex rubber composition in the present invention uses butadiene rubber, Mooney (Mooney) natural rubber having a viscosity of 55 ~ 65, and contains 1 to 3 parts by weight of STRUKTOL-40MS (dispersant) which is a kind of process aid. Characterized in that. In general, STRUKTOL-40MS (dispersant) is known to improve the homogeneity of the compound by facilitating the bonding between heterogeneous rubbers such as NR, BR, SBR, NR, and contribute to energy reduction to enhance the adhesiveness.

In the present invention, the apex rubber composition is based on various additives such as polymers, adhesives, anti-aging agents, and puts a natural rubber having a Mooney viscosity of 55 to 65 and STRUKTOL-40MS (dispersant) to find a tack (tackiness test) Method) and blow-out test were conducted. Tack performance can be rapidly improved by adding a certain amount of Mooney viscosity of 55-65 and STRUKTOL-40MS (dispersant) than general adhesives.

To the rubber composition of the present invention, conventional additives such as activators, galvanizing agents, vulcanizing agents, plasticizers, process oils, softeners, and anti-aging agents can be added as necessary, and the types and proper amounts of these additives are known in the art. .

In the present invention, the amount of STRUKTOL-40MS (dispersant) used is preferably between 1 and 3 parts by weight, more preferably 2 parts by weight. If it is added less than 1 part by weight, the effect as a dispersant is insignificant, and when more than 3 parts by weight, the physical properties are very low, it will not serve as an apex rubber composition.

Other components that can be added to the conventional apex rubber composition will be in accordance with the prior art, the detailed description thereof will be omitted.

Hereinafter, the content of the present invention will be described in detail by the following examples. However, these examples are only presented to understand the content of the present invention, the scope of the present invention is not limited to these examples.

Comparative Example 1

The mixing specifications of the test rubber compound were added to the basic recipe of the conventional apex rubber composition as shown in Table 1 below, and then mixed with natural rubber having a Mooney viscosity of 60 and a tackifier Dyphene-8318, followed by mixing at 160 ° C. Was discharged.

For the rubber prepared above, physical properties such as RHEO (160 ° C.), tensile properties, tack, blow out were measured according to ASTM-related regulations, and the results are shown in Table 1 below.

Comparative Example 2

The mixing specifications of the test rubber compound were added to the basic recipe of the conventional Apex rubber composition as shown in Table 1 below, followed by adding a natural rubber having a Mooney viscosity of 60 and a tackifier KPA-1350 to mix the mixture at 160 ° C. Discharged.

For the rubber prepared above, physical properties such as RHEO (160 ° C.), tensile properties, tack, blow out were measured according to ASTM-related regulations, and the results are shown in Table 1 below.

Comparative Example 3

The mixing specifications of the test rubber compound were added to the basic recipe of the conventional Apex rubber composition as shown in Table 1 below, followed by adding a natural rubber having a Mooney viscosity of 50 and a tackifier Dyphene-8318 to mix the mixture at 160 ° C. Discharged.

For the rubber prepared above, physical properties such as RHEO (160 ° C.), tensile properties, tack, blow out were measured according to ASTM-related regulations, and the results are shown in Table 1 below.

<Example 1>

The blending specification of the test rubber compound was added to 2 parts by weight of natural rubber and tackifier Dyphene-8318 and STRUKTOL-40MS (dispersant) having a Mooney viscosity of 60 to the basic recipe of a conventional Apex rubber composition as shown in Table 1 below. The mixture was discharged at 160 ° C.

For the rubber prepared above, physical properties such as RHEO (160 ° C.), tensile properties, tack, blow out were measured according to ASTM-related regulations, and the results are shown in Table 1 below.

TABLE 1

Comparative Example 1 Comparative Example 1 Comparative Example 2 Example 3 Natural rubber (Mooney viscosity: 60)  90  90  0  90 Natural rubber (Mooney viscosity: 50)  0  0  90  0 Butadiene rubber 10 10 10 10 Carbon black 60 60 60 60 Dyphene-8318 4 0 4 4 KPA-1350 0 4 0 0 STRUKTOL-40MS (dispersant) 0 0 0 2 TMDQ 2 2 2 2 Zincification 7 7 7 7 sulfur 4 4 4 4 accelerant 0.2 0.2 0.2 0.2 Process oil 8 8 8 8 Retardant 0.2 0.2 0.2 0.2 accelerant 2 2 2 2 RHEO (160 ℃) Max. Torque 40 39 40 38 Min. Torque 15 13 10 13 T90 minutes 10 10 10 10   Tensile Properties Hardness 90 90 92 90 300% modulus, kg / cm 3 165 165 160 160 Tensile strength, ㎏ / ㎠ 160 160 165 155 Elongation,% 300 300 310 300 Tack Energy ave (g.f * mm) 90 88 60 150 Blow out 100 ℃ 15 12 6 10

 Blow-out: A value measured using the B.F.Goodrich blow-out test. The longer the blow-out time, the better the blow-out characteristics.

As shown in Table 1, the difference in tackiness according to the type of tackifier is insignificant, the value of Tack that can measure the tackiness, which is a required characteristic of the apex rubber composition has a Mooney viscosity of 55 ~ 65 The addition of natural rubber and STRUKTOL-40MS (dispersant) increased about 250%.

As described above, by adding a certain amount of Mooney (Mooney) natural rubber and STRUKTOL-40MS (dispersant) to the Apex rubber composition can be prepared excellent rubber composition.

Claims (2)

In the apex rubber composition for tires, An apex rubber composition comprising 1 to 3 parts by weight of a STRUKTOL-40MS (dispersant) based on 100 parts by weight of a raw material rubber containing a natural rubber having a Mooney viscosity of 55 to 65. A tire comprising an apex rubber made of the rubber composition of claim 1.