KR20060101661A - Rim flange rubber composition improved tack power - Google Patents

Abstract

The present invention relates to a rim flange rubber composition with improved adhesion, and more particularly, a copolymer of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) as an adhesive in a conventional rim flange rubber composition. It relates to a rim flange rubber composition that can be applied to improve the adhesive force.

The present invention is a tire rim flange rubber composition which can improve the adhesiveness of rubber by applying a copolymer of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) as an adhesive to the tire rim flange rubber composition For the purpose of providing

The present invention provides a tire rim flange rubber composition comprising 1 to 10 phr of a copolymer consisting of para-tertiary butyl phenol formaldehyde of formula (1) and para-octyl phenol of formula (2) as an adhesive with respect to 100 phr of raw rubber. Indicates.

...식(1)

...식(2)

... Equation (1)

... (2)

In Formulas (1) and (2), n is a positive integer, and R is -C (CH ₃ ) ₃ .

Description

Rim flange rubber composition improved tack power

The present invention relates to a rim flange rubber composition with improved adhesion, and more particularly, a copolymer of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) as an adhesive in a conventional rim flange rubber composition. It relates to a rim flange rubber composition that can be applied to improve the adhesive force.

In general, when synthetic rubber is used as a raw material rubber when adhesive strength is required, the adhesive is added in the molding process to improve the adhesive strength of synthetic rubber, which is less adhesive than natural rubber. It improves dispersibility and contributes to the physical properties of rubber.

The pressure-sensitive adhesive used in the rubber composition is a natural resin system and a synthetic resin system, and mainly the alkyl phenol resin of the synthetic resin system is mainly used.

There is a problem in that a large amount of the pressure-sensitive adhesive should be used in order to improve the pressure-sensitive adhesive force by adding the pressure-sensitive adhesive of the synthetic resin system to the rubber composition or to obtain the required pressure-sensitive adhesive force.

All rubber compositions currently used in tires are used with adhesives to improve the adhesion between rubber semi-finished products.

The adhesion between these semi-finished products has a great influence on the performance of the finished tires, and the decrease in adhesive force is likely to cause air to enter between the semi-finished rubbers during molding of the rubber, but the joints of the semi-finished rubbers are opened to produce a defective product. .

Conventional adhesives used in the tire sector are mainly used for synthetic rubber, but petroleum resins and para-octyl phenol (POP) resins are used as boards, but rubber compositions requiring high adhesive strength, such as tire rim-flamed rubber, are used. There exists a tendency to use excess adhesive.

However, in the rim flange rubber composition, when a large amount of para-octyl phenol adhesive is used, there is a problem that the physical properties of the rubber are reduced, and when the para-octyl phenol adhesive is used so that the physical properties of the rubber do not decrease, the adhesive strength of the rubber is reduced. There is a problem.

The present invention has been studied to solve the above-mentioned problems, the copolymerization ratio of para-tert butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) ( Copolymer of para-octyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) by copolymerizing para-octyl phenol (POP) / para-tertiary butyl formaldehyde (PTBP) to 0.1 to 0.99 It was found that using the pressure-sensitive adhesive of the rim flange rubber composition can improve the adhesiveness of the rubber.

Therefore, the present invention is a tire rim flange rubber that can improve the adhesiveness of the rubber by applying a copolymer consisting of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) as an adhesive to the tire rim flange rubber composition It is for the purpose of providing a composition.

Another object of the present invention is to provide a tire comprising a rubber comprising a rubber composition comprising a copolymer of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) as an adhesive.

The present invention for achieving the above-mentioned object is a copolymer consisting of para-tertiary butyl phenol formaldehyde of the formula (1) and para-octyl phenol of the formula (2) as an adhesive for 100 phr of raw rubber A tire rim flange rubber composition containing 10 phr is shown.

...식(1)

...식(2)

... Equation (1)

... (2)

In Formulas (1) and (2), n is a positive integer, and R is -C (CH ₃ ) ₃ .

When the copolymer of para-tertiary butyl phenol formaldehyde and para-octyl phenol used in the present invention is less than 1 phr with respect to 100 phr of raw rubber, there is little effect of improving the adhesive force of the rubber and air enters during molding. There is a high possibility that the defective part is patterned due to the joint opening, and if the use of more than 10 phr with respect to 100 phr of the raw rubber, the adhesion performance of the rubber becomes so good that it is difficult to reshape during molding and the change of the semi-finished shape is difficult.

Therefore, the copolymer of para-tertiary butyl phenol formaldehyde and para-octyl phenol as an adhesive in the rubber composition of the present invention is preferably added in an amount of 1 to 10 phr based on 100 phr of the raw rubber.

The copolymer of para-tertiary butyl phenol formaldehyde and para-octyl phenol used in the present invention is a copolymerization ratio of para-tertiary butyl phenol formaldehyde and para-octyl phenol (para-octyl phenol (POP) / para). Tertiary butyl phenol formaldehyde (PTBP) may be copolymerized so that the copolymerization ratio is less than 1, more preferably 0.1 to 0.99.

If the copolymer ratio (POP / PTBP) of para-tertiary butyl phenol formaldehyde and para-octyl phenol is greater than 1, it is not preferable because improved adhesion to POP cannot be expected.

As the copolymer of para-tertiary butyl phenol formaldehyde and para-octyl phenol used as the adhesive in the present invention, those having an average molecular weight of 1000 to 3000 can be used.

The copolymer of para-tertiary butyl formaldehyde and para-octyl phenol used as an adhesive in the present invention has a softening point of 90 to 130 ° C.

In the present invention, the raw material rubber can be used as long as it can be used as the raw material rubber of the conventional tire rim flange rubber composition.

As an example of the raw material rubber in the present invention, natural rubber or synthetic rubber may be used alone, or mixed rubber mixed with natural rubber and synthetic rubber in a weight ratio of 1: 9 to 9: 1 may be used as the raw material rubber.

Synthetic rubber in the present invention may be any one or more selected from styrene butadiene rubber, butadiene rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber containing nitrile, neoprene rubber.

In addition, in the present invention, the raw material rubber may be a mixed rubber obtained by mixing two or more of the above synthetic rubbers. At this time, these mixed rubber may be used a mixed rubber mixed in a weight ratio of 1: 9 to 9: 1.

According to the present invention, various additives such as reinforcing fillers, activators, anti-aging agents, process oils, vulcanizing agents, and vulcanization accelerators, which are used in conventional tire rim flange rubber compositions, in addition to the above-mentioned raw rubbers and pressure-sensitive adhesives are appropriately selected as necessary. It can be used as a content. However, these are general components used in the conventional tire rim flange rubber compositions and are not essential components of the present invention.

In the present invention, the pressure-sensitive adhesive may be obtained by copolymerizing para-tertiary butyl phenol formaldehyde and para-octyl phenol. At this time, para-tertiary butyl phenol formaldehyde and para-octyl phenol are sufficient if a copolymer can be obtained by a conventional copolymerization method, and a special copolymerization method is not necessary. Since it is not an urea, specific details of these copolymerization methods will be omitted.

On the other hand, the present invention includes a tire containing a rubber made of the tire rim flange rubber composition. In this case, the tire includes any one selected from tires for automobiles, tires for trucks, and tires for buses.

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.

<Example 1>

Copolymer 1phr composed of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) having a copolymerization ratio (POP / PTBP) of 0.5 to 100 phr of raw rubber composed of 50 phr of natural rubber and 50 phr of butadiene rubber. , 65 phr of carbon black (N351), 3 phr of process aid, 5 phr of antioxidant (2,2,4-trimethyl-1,2-dihydroquinoline, RD), 6 phr of activator (3 phr stearic acid, 3 phr galvanized), sulfur 3.0 phr, vulcanization accelerator ( CZ) 3phr was placed in a Banbury mixer, mixed and then released at 160 ° C. for 15 minutes to prepare a rubber.

Table 1 shows the rubber composition of Example 1.

<Example 2>

 A rubber was manufactured in the same manner as in Example 1, except that 3 phr of a copolymer consisting of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) having a POP / PTBP ratio of 0.5 was used.

<Example 3>

 A rubber was prepared in the same manner as in Example 1, except that 5 phr of a copolymer consisting of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) having a POP / PTBP ratio of 0.5 was used.

<Example 4>

 A rubber was manufactured in the same manner as in Example 1, except that 8 phr of a copolymer consisting of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP) having a POP / PTBP ratio of 0.5 was used.

Comparative Example

A rubber was manufactured in the same manner as in Example 1, except that 8 phr of para-octyl phenol (POP) was used as an adhesive.

Table 1 Rubber Composition of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Example 4 Natural rubber 50 50 50 50 50 Butadiene rubber 50 50 50 50 50 Carbon black (N351) 65 65 65 65 65 Active agent 6 6 6 6 6 Process 3 3 3 3 3 adhesive* 8 - - - - adhesive** - One 3 5 8 Anti-aging 5 5 5 5 5 sulfur 3.0 3.0 3.0 3.0 3.0 Vulcanization accelerator 1.5 1.5 1.5 1.5 1.5

Para-octyl phenol (POP)

** Copolymer of para-tertiary butyl phenol formaldehyde (PTBP) and para-octyl phenol (POP)

<Test Example>

Physical properties such as rheometer, mooney viscosity, tensile property, adhesive power, DMFC (Dimattia Flex Cracking) for the rubbers of the comparative examples and examples were determined by ASTM-related regulations. The measurement was performed and the results are shown in Table 2 below.

<Table 2> Physical Properties of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Example 4 Rheometer T40 5.1 5.0 5.2 5.4 5.3 T90 7.0 6.9 7.0 7.0 7.1 Torque 49.2 50.3 50.0 49.1 48.5 Mooney viscosity Viscosity 57.6 57.3 55.4 54.8 52.3 Scotch Time 23.0 25.3 24.7 26.0 24.7 Tensile Properties Hardness 74 76 74 73 73 300% modulus 208 205 207 210 212 The tensile strength 204 202 204 202 201 Elongation 289 275 280 279 280 adhesiveness Early 27.9 27.0 28.4 30.8 33.7 1 day aging * 28.7 28.5 30.4 32.7 35.1 DMFC horizontal 5.4 5.6 5.5 4.8 3.2 Vertical 8.3 8.1 7.6 8.0 6.4

* Aging is left at room temperature

As shown in Table 2, the rubber of the example prepared by the present invention can be seen that the adhesive force is improved while having the physical properties equal to or higher than the rubber of the conventional comparative example.

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 present invention described in the claims below. It will be appreciated that it can be changed.

Claims (3)

In a tire rim flange rubber composition, A tire rim flange rubber composition having improved adhesion, characterized in that 1 to 10 phr of a copolymer consisting of para-tertiary butyl formaldehyde of formula (1) and para-octyl phenol of formula (2) is added to 100 phr of raw rubber.

... Equation (1)

... (2) In Formulas (1) and (2), n is a positive integer, and R is -C (CH ₃ ) ₃ . The improved tire rim flange rubber according to Claim 1, wherein the copolymerization ratio of para-tertiary butyl formaldehyde and para-octyl phenol (para-octyl phenol / para-tertiary butyl formaldehyde) is 0.1 to 0.99. Composition. The improved tire rim flange rubber composition according to claim 1, wherein the copolymer of para-tertiary butyl formaldehyde and para-octyl phenol has a molecular weight of 1000 to 3000.