KR20130002141A - Rubber reinforced by glass fiber - Google Patents

Abstract

PURPOSE: A glass fiber-reinforced rubber composition is provided to have excellent tear strength, hardness, tensile strength and durability by comprising a specific amount of glass fiber. CONSTITUTION: A glass fiber-reinforced rubber composition comprises 100 parts by weight of rubber and 1-30 parts by weight of glass fiber. The rubber is a natural rubber(NR), a nitrile-butadiene rubber or ethylene-propylene diene monomer rubber. The composition additionally comprises one or more additives selected from a vulcanization accelerator, stearic acid, antioxidant, adhesive and filler. The vulcanization accelerator is ZnO, bis(2-benzothiazolyl(disulfide)) or tetrametyl thiuram disulfide.

Description

Fiber reinforced rubber {Rubber reinforced by glass fiber}

The present invention relates to a rubber reinforced mechanical properties such as durability by mixing the glass fiber in the rubber, such as engine or T / M (Transmission) mount, bushing rubber.

Existing engines or T / M mounts, various bushing rubbers, and other rubbers may have excessive torque tightening during clamping or assembly of hoses, lack of tear resistance of airtight areas in case of sealing rubber, and durability deterioration in case of dustproof and bushing rubbers. The problem was not solved.

Conventionally, a mixture for increasing the durability by mixing fillers, reinforcing materials, etc. was used, but the limit was large, and thus, the development of a technology capable of increasing durability was absolutely necessary.

Accordingly, the present inventors have found that physical properties such as durability are significantly improved when the glass fiber is mixed in a specific content in view of the above situation, thereby completing the present invention.

Accordingly, an object of the present invention is to provide a rubber having excellent mechanical properties such as durability.

The present invention for achieving the above object

100 parts by weight of rubber and

It provides a glass fiber reinforced rubber composition comprising 1 to 30 parts by weight of glass fiber.

The glass fiber reinforced rubber composition according to the present invention contains glass fibers in a specific content, and shows excellent performance compared to conventional rubber in terms of durability such as tear strength, hardness, tensile strength, and elongation.

Hereinafter, the present invention will be described in more detail.

Glass fiber reinforced rubber composition according to the present invention

100 parts by weight of rubber and

It comprises 1 to 30 parts by weight of glass fiber.

At this time, the rubber is currently used as a rubber component rubber type can be used without limitation. Specifically, natural rubber (NR), nitrile-butadiene rubber (NBR) or ethylene-propylene-diene monomer rubber (EPDM) can be mentioned.

The present invention is characterized in blending glass fibers in order to improve the durability of such rubber components. Glass fiber plays a role of improving durability such as tear strength and tensile strength when blending with rubber due to its inherent properties. The amount of glass fibers used may be 1 to 30 parts by weight based on 100 parts by weight of rubber, more preferably 5 to 20 parts by weight.

In addition, the composition according to the present invention may further include at least one additive selected from the group consisting of vulcanization accelerators, vulcanizing agents, stearic acid, antioxidants, pressure-sensitive adhesives and fillers.

Examples of the vulcanization accelerator used in the present invention include zinc oxide (ZnO), 2-benzothiazolyl (disulfide) (MBTS), tetrametyl thiuram disulfide (MTTD), etc. Among these, ZnO is a natural rubber as an inorganic vulcanization accelerator. (NR) is preferably used in an amount of 8 to 10 parts by weight, and NBR and EPDM is preferably used in an amount of 4 to 5 parts by weight, and MBTS (bis (2-benzothiazolyl (disulfide) is an acidic organic vulcanization). As an additive most widely used as an accelerator, NR, NBR, and EPDM can all be used in an amount of 1 part by weight or less.TMTD (tetrametyl thiuram disulfide) is an acidic organic vulcanization accelerator and is used as a secondary accelerator when sulfur is low. It is not effective for the vulcanized NR, and NBR and EPDM are preferably added in an amount of 1 part by weight or less, because when used too much, the scorch time becomes short.

Sulfur is an inorganic vulcanizing agent that crosslinks rubber. In the case of NR, which is a crystalline rubber, it is preferably used in an amount of 2.5 parts by weight or less, and in the case of NBR and EPDM, which is an amorphous rubber, it is preferably used in an amount of 0.5 parts by weight or less. When the ratio is exceeded, the elastic force may be lost, and a blooming phenomenon (blending agent may be deposited on the surface and crystallization) may occur.

Stearic acid is a filler, an elasticity enhancer, and also serves as a ZnO dispersibility aid and an initial vulcanization accelerator. The content is preferably added in an amount of 2.5 parts by weight or less for NR, 1 part by weight or less for NBR, and 2 parts by weight or less for EPDM. If the range is exceeded, blooming may occur.

As antioxidant, polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TDQ) can be used. Such antioxidants are preferably included in an amount of 1% by weight or less for NR, 2 parts by weight or less for NBR, and 5 parts by weight or less for EPDM. If the range is exceeded, blooming may occur.

Coumarone-indene (CI) Resin may be used as an adhesive. Since it is added during the production of synthetic rubber, it is not necessary for NR, and it is preferable that it is added in the range of 4 to 5 parts by weight for both NBR and EPDM. If it is less than the above range, the blending scattering degree is lowered, and when exceeded, the scorch time is decreased and blooming may occur.

Carbon black may be used as the filler. Carbon black serves to reinforce the durability and tear resistance of the rubber at the same time is preferably used in the range of 40 to 45 parts by weight. If it exceeds the above range, physical properties such as durability may be lowered.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited to the following examples.

Example  1 to 9 and Comparative example  1 to 3

To prepare a rubber composition according to the ratio (parts by weight) of Table 1.

Basic resin Fiberglass ZnO Stearic acid Carbon black TDQ sulfur MBTS TMTD Coumarone-indene (CI) Resin Specific gravity (S.G) Example 1 NR
(100) 10 9 2.5 39 One 2.5 One - - 1.210 Example 2 NR
(100) 20 9 2.5 39 One 2.5 One - - 1.210 Example 3 NR
(100) 30 9 2.5 39 One 2.5 One - - 1.210 Example 4 NBR
(100) 10 4.5 One 44 2 0.5 One One 4.5 1.253 Example 5 NBR
(100) 20 4.5 One 44 2 0.5 One One 4.5 1.253 Example 6 NBR
(100) 30 4.5 One 44 2 0.5 One One 4.5 1.253 Example 7 EPDM
(100) 10 4.5 2 44 5 0.5 One One 4.5 1.142 Example 8 EPDM
(100) 20 4.5 2 44 5 0.5 One One 4.5 1.142 Example 9 EPDM
(100) 30 4.5 2 44 5 0.5 One One 4.5 1.142 Comparative Example 1 NR
(100) - 9 2.5 39 One 2.5 One - - 1.127 Comparative Example 2 NBR
(100) - 4.5 One 44 2 0.5 One One 4.5 1.172 Comparative Example 3 EPDM
(100) - 4.5 2 44 5 0.5 One One 4.5 1.057

The temperature of the kneading roll (chamber) was 110-130 ° C. The rotation speed of the kneading roll was 1.15 to 1.25, and the raw materials were added in the order of small quantities and large quantities of raw materials. Mixing time was carried out for 3 to 4 minutes.

In order to confirm the same batch sample composition and the uniformity of the formulation distribution, after random sample selection, the composition was confirmed by TGA and the carbon black dispersion was confirmed by an optical microscope.

The specimen was then processed to evaluate tear strength, hardness, tensile strength and elongation and the results are shown in Table 2.

Tear strength (kN / m) Hardness (Sh.A) Tensile Strength (kg _f / cm ² ) Elongation (%) Comparative Example 1 46.5 54 118 380 Example 1 50.1 62 138.2 421 Example 2 42.7 63 121.1 422 Example 3 42.1 65 110.3 434 Comparative Example 2 78.2 70 170.1 551 Example 4 79.4 73 174.5 454 Example 5 89.1 75 184.4 557 Example 6 64.8 77 130.1 512 Comparative Example 3 78 70 142 405 Example 7 82 73 204 564 Example 8 64 75 161 600 Example 9 62 75 104 600 Test standard ASTM D 1922 MS269-03 MS269-03 MS269-03

As can be seen from the results of Table 2, in the case of natural fiber (NR), when the glass fiber 10 parts by weight is used, the tear strength is about 4% and the hardness is about 7 compared to the composition without using the conventional glass fiber. %, Tensile strength was about 17%, elongation was about 10% increased.

In addition, in case of NBR rubber, 20 parts by weight of glass fiber is used, the tear strength is increased by about 14%, the hardness by about 7%, and the tensile strength by about 8% compared to the composition without using the conventional glass fiber. there was.

In the case of EPDM rubber, when 10 parts by weight of glass fiber is used, the tear strength is about 5%, the hardness is about 4%, the tensile strength is about 44%, and the elongation is about 10% by weight. 40% increase was confirmed.

It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (4)

100 parts by weight of rubber and
Glass fiber reinforced rubber composition comprising 1 to 30 parts by weight of glass fiber.
The glass fiber reinforced rubber composition according to claim 1, wherein the rubber is natural rubber (NR), nitrile-butadiene rubber (NBR) or ethylene-propylene-diene monomer rubber (EPDM).
The glass fiber reinforced rubber composition according to claim 1, wherein the composition further comprises at least one additive selected from the group consisting of a vulcanization accelerator, stearic acid, an antioxidant, an adhesive, and a filler.
The method according to claim 3, wherein the vulcanization accelerator ZnO (zinc oxide), MBTS (bis (2-benzothiazolyl (disulfide)) or TMTD (tetrametyl thiuram disulfide), characterized in that the glass fiber reinforced rubber composition.