KR20160060252A - Rubber composite diffused para-aramid fiber for rubber's reinforcement and manufacturing method thereof - Google Patents

Rubber composite diffused para-aramid fiber for rubber's reinforcement and manufacturing method thereof Download PDF

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KR20160060252A
KR20160060252A KR1020140161901A KR20140161901A KR20160060252A KR 20160060252 A KR20160060252 A KR 20160060252A KR 1020140161901 A KR1020140161901 A KR 1020140161901A KR 20140161901 A KR20140161901 A KR 20140161901A KR 20160060252 A KR20160060252 A KR 20160060252A
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rubber
para
phr
aramid
rubber composition
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KR1020140161901A
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Korean (ko)
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변영후
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주식회사 대영특수고무
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Publication of KR20160060252A publication Critical patent/KR20160060252A/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/046—Reinforcing macromolecular compounds with loose or coherent fibrous material with synthetic macromolecular fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00—Characterised by the use of unspecified rubbers

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Reinforced Plastic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The present invention relates to a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed, and a method for producing the same. More particularly, the present invention relates to rubber reinforced aramid fibers, The present invention relates to a rubber composite in which para-aramid fibers are dispersed, and a method for producing the same.
The present invention provides a rubber composition comprising: a rubber composition preparation step of obtaining a rubber composition containing a raw rubber; A fiber pretreatment step of preparing para-aramid staple fibers; And a step of preparing a rubber composite by dispersing the para-aramid short fibers in the rubber composition to produce a rubber composite. The rubber composite in which para-aramid fibers are dispersed for rubber reinforcement, It is essential.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rubber composite having a para-aramid fiber dispersed therein for rubber reinforcement,

The present invention relates to a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed, and a method for producing the same. More particularly, the present invention relates to rubber reinforced aramid fibers, The present invention relates to a rubber composite in which para-aramid fibers are dispersed, and a method for producing the same.

Generally, rubber composites composed of rubber compositions and fibers are a significant proportion of all rubber products. Such a rubber composite fiber is used as a reinforcing material, and the rubber composition serves as a matrix to protect the reinforcing material and transmit external force to the reinforcing material.

In addition, the adhesion between the rubber composition and the fibers in the rubber composite is also an important factor in determining the durability of the product. Particularly, as a method for achieving a high adhesive force between the rubber composition and the fiber, there is a method of treating the fiber with an adhesive or adding an adhesive to the rubber composition.

On the other hand, commercially available fibers of high utilization strength include aromatic polyamide (i.e., aramid) fibers. The reason why such aramid fibers are used for various applications as a reinforcing material and shows potential for development is that they show excellent physical properties such as mechanical properties, chemical properties and heat resistance as compared with other rubber reinforcing fibers.

In the 'aramid fiber-reinforced rubber composite material and its manufacturing method (Application No.: 10-2009-0017334)', a high-elasticity chloroprene rubber is applied to the plasma-treated aramid fiber, To provide a fiber reinforced rubber composite having improved impact resistance by coating and pressing a rubber composition containing the aramid fibers to prepare a prepreg, and then laminating the prepregs. However, applying aramid fibers only to the rubber composition causes a decrease in adhesion between the materials .

Figure 1 is a fibril development diagram of para-aramid fibers. As shown in Fig. 1 showing the fibrillation phenomenon of para-aramid fibers due to rotational friction with a machine or the like, there is a serious disadvantage that when the para-aramid fiber is used, the surface of the fiber rubs with the machine during the process, and fibrillation may occur. When such a fibrillated imperfect para-aramid fiber is bonded to a rubber composition, there is a problem that the defective ratio is increased due to entanglement of the fibers.

Accordingly, in order to reduce the defective rate in the process and improve the physical properties, it is a time to develop new technology of a rubber composite capable of bonding a rubber composition and a para-aramid fiber.

KR 10-1079040 B1

Disclosure of Invention Technical Problem [8] The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed and capable of improving process efficiency and physical properties by improving dispersibility of para- And a method for producing the same.

In order to accomplish the above object, the present invention provides a method of preparing a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed, comprising the steps of: preparing a rubber composition comprising a raw rubber; A fiber pretreatment step of preparing para-aramid staple fibers; And a step of preparing a rubber composite by dispersing the para-aramid short fibers in the rubber composition.

The para-aramid staple fiber in the fiber pretreatment step is a surface modification step in which para-aramid fibers are surface-treated with resorcinol formaldehyde latex (RFL); And a fiber cutting step of uniformly cutting the surface treated para-aramid fibers to 1 to 6 mm.

The dispersion in the completion step of the rubber composite is carried out through a meshing cross rotor in which the first rotor and the second rotor in the mixer mesh with each other to disperse the para-aramid staple fibers in the rubber composition do.

The rubber composition preferably comprises 10 to 50 PHR of carbon black containing at least one of SRF (semi reinforcing furnace) and FEF (fast extrusion furnace), 1 to 5 PHR of crosslinking auxiliary, 1 stearic acid 1 ~ 2 PHR, 5 ~ 10 PHR of calcium hydroxide, and 2 ~ 10 PHR of dioctyl adipate (DOA).

The rubber composite in which the para-aramid fiber for rubber reinforcement produced by this method is dispersed is characterized in that it comprises a rubber composition comprising a raw rubber; And para-aramid staple fibers dispersed in the rubber composition, wherein the rubber composition comprises at least one of a semi reinforcing furnace (SRF) and a fast extrusion furnace (FEF) with respect to the raw rubber 100 PHR A carbon black 10 to 50 PHR, a crosslinking auxiliary 1 to 5 PHR, a stearic acid 1 to 2 PHR, a calcium hydroxide 5 to 10 PHR, a dioctyl adipate (DOA) 2 to 10 PHR, The aramid staple fibers are characterized by being formed by surface-treating para-aramid fibers with RFL (resorcinol formaldehyde latex) and uniformly cutting the filaments to 1 to 6 mm.

The present invention provides a rubber composite in which a para-aramid fiber for rubber reinforcement is dispersed and a method of manufacturing the same, By uniformly dispersing para-aramid staple fibers in a rubber composition by using intermeshing rotors that are a combination of a rotor and a second rotor, it is possible to improve the process efficiency and reduce the defective ratio to 2% or less .

Fig. 1 shows the fibril development of para-aramid fibers. Fig.
2 is a conceptual diagram according to a preferred embodiment of the present invention;
3 is a schematic view of an intermeshing rotor according to a preferred embodiment of the present invention;
Figure 4 is a geometric view of a tangential (non-intermeshing) rotor;

The rubber composite in which the para-aramid fiber for rubber reinforcement of the present invention is dispersed is composed of a rubber composition containing a raw rubber and a para-aramid short fiber dispersed in a rubber composition. Here, the rubber composition preferably contains 10 to 50 PHR of a carbon black containing at least one of SRF having a particle diameter of 60 to 100 nm and FEF having a particle diameter of 40 to 50 nm, 1 to 5 PHR of a crosslinking auxiliary , 1 to 2 PHR of stearic acid, 5 to 10 PHR of calcium hydroxide, 2 to 10 PHR of dioctyl adipate (DOA). Para-aramid staple fibers are surface-treated with para-aramid fibers by RFL (resorcinol formaldehyde latex) and then uniformly cut to 1 to 6 mm.

Hereinafter, a method of producing a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed will be described in detail with reference to the accompanying drawings, which show preferred embodiments of the present invention.

2 is a conceptual diagram according to a preferred embodiment of the present invention. 2- (a) shows the surface of the para-aramid staple fiber with RFL, Fig. 2- (b) shows the master batch as the rubber composition, and Fig. 2- Based aramid short fibers were uniformly dispersed in the rubber composition.

That is, the rubber composite in which para-aramid fibers for rubber reinforcement are dispersed according to a preferred embodiment of the present invention and a method for producing the same, comprises a rubber composition preparation step, a fiber pre-treatment step and a rubber composite completion step.

First, the rubber composition preparation step will be described.

The rubber composition preparation step is a step of obtaining a rubber composition containing the raw rubber. The raw rubber is subjected to mastication for 1 to 3 minutes to give plasticity, and various additives are added to the raw material rubber to be kneaded Thereby forming a rubber composition. The above-mentioned mastication is also referred to as descending work, which refers to the work of applying rubber shear force and heat to depolymerize the rubber so that the rubber is softened into a uniform plasticized state.

That is, the rubber composition preparation step is a step of making a master batch, and the master batch means that an additive is added to the raw rubber.

Such a rubber composition may be prepared by mixing 10 to 50 PHR of carbon black containing at least one of SRF having a particle diameter of 60 to 100 nm and FEF having a particle diameter of 40 to 50 nm, 1 to 5 PHR of a crosslinking auxiliary, 1 to 2 PHR of acid, 5 to 10 PHR of calcium hydroxide, and 2 to 10 PHR of dioctyl adipate (DOA).

The above-mentioned starting rubber may be selected from the group consisting of nitrile-butadiene rubber (NBR), hydrogenated nitrile-butadiene rubber (HNBR), fluorinated rubber (KFM), styrene-butadiene rubber -butadiene rubber, chloroprene rubber, and silicone rubber can be selected and used.

In particular, nitrile-butadiene rubbers have good price competitiveness at low cost, hydrogenated nitrile-butadiene rubbers are suitable for manufacturing high performance products with high tensile strength and high toughness, fluorine rubbers have excellent heat resistance and silicone rubbers have high temperature, It is possible to appropriately select the raw rubber according to the demand of the consumer.

The carbon black serves as a reinforcing filler. The carbon black is a semi-reinforcing furnace carbon black (SRF) having a particle diameter of 60 to 100 nm which is suitable for abrasion resistance and low hardness and is used as an intermediate stiffness. It is preferable to use any one or more of FEF (fast extrusion furnace) type carbon black having a particle diameter of 40 to 50 nm which is used for positive pressure production.

If carbon black is added below 10 PHR, the filler effect may be poor and the physical properties may not be good. When the carbon black is added above 50 PHR, there is a limit to obtain desired physical properties due to excessive hardness increase, It is preferable that the carbon black is contained in the range of 10 to 50 PHR. In other words, either the SRF system or the FEF system may be used alone or in a range of 10 to 50 PHR.

To describe stearic acid, stearic acid (C 18 H 36 O 2 ), which is a carboxylic acid fatty acid having 14 to 20 carbon atoms, was applied in the present invention. Such stearic acid serves as a processing agent to improve the uniformity and processability of the rubber composition. If it is less than 1 PHR, improvement in workability due to decrease in viscosity of the rubber composition can not be expected. If it exceeds 2 PHR, Etc., and is uneconomical for commercialization, it is preferable to add stearic acid by 1 to 2 PHR to 100 PHR of the starting rubber. For reference, palmitic acid, oleic acid, or the like may be selected and used as a substitute for such stearic acid.

The above-mentioned co-crosslinking agent reinforces the physical properties of the rubber composition and enhances the degree of crosslinking, and one or more of zinc oxide (ZnO) and magnesium oxide (MgO) can be selected and used.

That is, any substance having a reactive functional group can be used as a crosslinking auxiliary. In addition to zinc oxide and magnesium oxide, vinyltrimethoxyethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, mercaptopropyltrimethoxysilane, etc. (TAC), triaryl isocyanurate (TAIC) and the like, and a methacrylate compound such as trimethylopropane trimethacrylate (TMPTMA) and the like, and a silane compound such as trimethylolpropane trimethacrylate May be selected and used.

When the content of the crosslinking aid is less than 1 PHR relative to 100 PHR of the starting rubber, the crosslinking function can not be performed and the tensile strength and heat resistance are not improved. When the content is more than 5 PHR, The crosslinking assistant is preferably contained in the range of 1 to 5 PHR since the crosslinking agent may not only be effective but may also deteriorate the extensibility.

The above-mentioned calcium hydroxide provides flame retardancy to the rubber composition, and it is preferable to use at least one selected from the group consisting of metal hydroxides. Examples of metal hydroxides include aluminum hydroxide, magnesium dihydroxide, calcium hydroxide, basic magnesium carbonate, hydrotalcite, hunting, hydro-magneite and the like. In a preferred embodiment of the present invention, the economical calcium hydroxide is added by 5 to 10 PHR to 100 PHR of the raw rubber. If the pH is less than 5 PHR, the physical properties such as tensile strength may deteriorate. If it exceeds 10 PHR, the dispersibility in the rubber composition may deteriorate simultaneously with the loadability of the equipment. Therefore, the calcium hydroxide is maintained in the range of 5 to 10 PHR .

The above-mentioned dioctyl adipate (DOA) is required for improving the flowability and processability in the rubber composition. If less than 2 PHR is added, the effect of improving cold resistance, flowability and workability is insignificant. If it exceeds 10 PHR It is preferable that the dioctyl adipate is added in an amount of 2 to 10 PHR relative to 100 PHR of the raw rubber since it may cause excessive shrinkage of the rubber composition.

Here, additives such as a curing agent (sulfur), an accelerator, an anti-aging agent and the like which can be usually used in the rubber composition according to the present invention may be further included. The kind and content of such an additive are preferably adjusted by appropriately taking into consideration the purpose of use and intended effect of the rubber composition.

For example, an antioxidant functions to prevent oxidation of the rubber composition, to prevent oxidation, to prevent heat aging, to prevent bending cracks, to prevent sunlight and to prevent ozone aging, and to use N-phenyl-N'-isopropyl- N-phenyl-N'-isopropyl-p-phenylenediamine, acetone, p-aminodiphenylamine, styrenated phenol, styrene, phenol ), And 2-mercaptobenzimidazole, may be selected and mixed.

Next, the fiber pretreatment step will be described.

That is, the fiber pretreatment step is a step for preparing para-aramid staple fibers to obtain para-aramid staple fibers to be dispersed in the rubber composition before the rubber product manufacturing process such as sealing, packing and diaphragm is completed.

Para-aramid fibers, which are also called poly (p-phenylene-terephthalamide), have excellent high-temperature properties and low-creep characteristics in addition to tensile properties and are thus applied to the present invention.

These para-aramid staple fibers are subjected to a surface modification step of treating para-aramid fibers with RFL (resorcinol formaldehyde latex), followed by a fiber cutting step of uniformly cutting the surface treated para-aramid fibers to 1 to 6 mm Can be obtained after roughing.

Particularly, when the length of the para-aramid fiber is less than 1 mm, the reaction with the rubber composition becomes difficult and it is difficult to impart stability to the dimensional deformation during the production of the rubber product. When the length exceeds 6 mm, Is not satisfactory and causes non-uniformity in the rubber composition. Therefore, it is preferable to cut the length of the para-aramid fiber precisely to 1 to 6 mm. For example, the above-mentioned precise cutting means that cutting is performed so that a length error of 0.9 to 1.1 mm or the like does not occur when the cutting length is set to 1 mm.

In addition, if the adhesion between the fiber and the rubber composition is not good, peeling occurs in the final finished rubber product, which is a major cause of failure, so that the bonding process between the fiber and the rubber composition is a necessary condition.

Accordingly, the RFL used to reduce the defective ratio after fiber cutting and to minimize the fibrillation of the fiber surface is resorcinol-formaldehyde (RSL) to maintain the effective adhesion of the rubber composition and para-aramid staple fibers ) ≪ / RTI > resin and a latex. NR and SBR latex are mainly used as the latex, but vinyl pyridine latex having good effect is used in the present invention.

Additionally, in order to maintain good adhesion of the para-aramid fibers, surface treatment may be performed primarily using epoxy or modified epoxy prior to surface treatment with RFL.

Finally, a description will be given of a step of completing a rubber composite to carry out a dispersion process, which is a feature of the present invention.

The step of completing the rubber composite is a step of producing a rubber composite by dispersing para-aramid short fibers (that is, cut para-aramid fibers) in a rubber composition. Parabolic aramid short fibers dispersed in the rubber composition serve as reinforcing materials, This reinforcing effect is manifested by effective interfacial interaction with the rubber composition due to the dispersed state.

The dispersion in this step is preferably performed through an intermeshing rotor 100 comprising a first rotor 102 and a second rotor 104 inside the mixer.

3 is a schematic view of an intermeshing rotor according to a preferred embodiment of the present invention. That is, it is a schematic presentation showing an internal mixer having an intermeshing rotor 100.

Referring to FIG. 3, in the present invention, a mixer in the form of a dentate cross-rotor 100 is used to disperse para-aramid staple fibers in a rubber composition.

In other words, the mixer in the form of a cogwheel crossover rotor 100 imparts a considerably large shearing force to the materials during the process to obtain a rubber product having excellent dispersion, Can be suppressed.

That is, the geared crossover rotor 100 has a structure in which the first rotor 102 and the second rotor 104 are accurately engaged with each other. The first rotor 102 and the second rotor 104 are connected to the inner wall A large shearing force is applied to the material to perform a mixing function.

This means that dispersion can proceed at the center point between the major diameter 106 of the first rotor 102 and the minor diameter 108 of the second rotor 104, There is no free space in the aramid short fibers to achieve complete dispersion of aramid short fibers.

4 is a schematic view of a tangential (non-intermeshing) rotor which is not a coupling type. Referring to FIG. 4, it can be seen that this is a schematic presentation showing an internal mixer having a tangential (non-intermeshing) rotor.

Specifically, the comparative rotor type mixer, which is not a coupling type, has a structure in which rotors are separated from each other due to rapid discharge of the rubber composite due to the input of raw material, though productivity may be excellent.

This structure means that the dispersing action does not occur at the center point of the mixer, and it means that there is a lot of free space in the inside and the perfect dispersion is not achieved.

In other words, unlike the comparative rotor rotates separately from each other, the interlocking rotor 100 in which the first rotor 102 and the second rotor 104 mesh with each other rotates in a similar manner to the toothed wheel, It is possible to effectively distribute and distribute the para-aramid staple fibers to the rubber composition by transferring a stronger shearing force to the fibers.

Here, it can be seen that the para-aramid staple fibers evenly dispersed with a strong shearing force increase the contact area with the rubber composition, so that the interaction between the rubber composition and the para aramid staple fibers increases. The crosslinking density of the finished rubber composite can also be increased by increasing such interactions.

In addition, the rubber composite completed by receiving a large shear force in the mixer of the crossed-type rotor 100 has a higher dispersing power of the para-aramid staple fiber than that of the comparative rotor type mixer I could confirm.

As a result of observing the dispersing power of the para-aramid staple fibers in the rubber composition, the inventors of the present invention found that the para-aramid staple fibers by the dental type crossing rotor 100 are more uniform than the para-aramid staple fibers by the comparative rotor It can be confirmed that it is dispersed.

This result shows that the geared structure of the rotor 100 allows the shear force of the geared type crossing rotor 100 to be greater than that of the comparative rotor to effectively disperse the para-aramid staple fibers by the geometry of the rotor, 100 < / RTI > type mixer to disperse para-aramid staple fibers in the rubber composition.

That is, since the fibers of the simple structure composed of a multilayer structure such as a general rubber-fiber-rubber are not flexible and the fibers are distorted to cause a defective product ratio of 30% or more, in the present invention, (100), it is possible to reduce the product defect rate to 2% or less by dispersing para-aramid staple fibers in the rubber composition.

In detail, by uniformly dispersing the cleaved para-aramid fibers in a rubber composition, it is possible to solve the problem that a simple structure composed of a multi-layer structure by lamination between a conventional rubber composition and fibers lowers the process efficiency due to precision work .

In other words, the para-aramid staple fibers of the present invention can be dispersed in the rubber composition to facilitate molding in shape, thereby improving the process efficiency. Therefore, it is possible to meet the demands of the high performance of the rubber products, thereby expanding the end use and expanding the demand.

As described above, the rubber composite in which the para-aramid fibers for rubber reinforcing according to the present invention are dispersed and the method of manufacturing the same are manufactured by using an internal mixer having a meshing cross-rotor, By uniformly dispersing the fibers, the process efficiency can be improved and a rubber composite reduced in defective ratio to 2% or less can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied otherwise without departing from the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to be illustrative, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

100: interlocking crossover rotor 102: first rotor
104: second rotor 106: outer diameter
108: bone diameter

Claims (5)

A rubber composition preparing step of obtaining a rubber composition containing a raw rubber;
A fiber pretreatment step of preparing para-aramid staple fibers; And
And a step of preparing a rubber composite by dispersing the para-aramid short fibers in the rubber composition to prepare a rubber composite. The method of producing a rubber composite in which para-aramid fibers for rubber reinforcement are dispersed. The method according to claim 1,
The para-aramid staple fibers in the fiber pre-
Surface modification step of surface treatment of para-aramid fibers with resorcinol formaldehyde latex (RFL); And
And a fiber cutting step of uniformly cutting the surface treated para-aramid fibers to 1 to 6 mm. [Claim 6] The method according to claim 1, The method according to claim 1,
The dispersion in the rubber composite finishing step,
Characterized in that the aramid fibers are made by intermeshing rotors which are formed by a first rotor and a second rotor in the mixer which are joined with each other to disperse the para-aramid staple fibers in the rubber composition. A method for producing a dispersed rubber composite. The method according to claim 1,
The rubber composition may contain,
For the raw rubber 100 PHR,
Carbon black 10 to 50 PHR containing at least one of a semi reinforcing furnace (SRF) and a fast extrusion furnace (FEF), 1 to 5 PHR of crosslinking auxiliary, 1 to 2 PHR of stearic acid, 5 to 10 PHR of calcium hydroxide, Characterized in that it contains 2 to 10 PHR of dioctyl adipate (DOA). A rubber composition comprising a raw rubber; And
Based aramid staple fiber dispersed in the rubber composition,
The rubber composition may contain,
10 to 50 PHR of carbon black containing at least one of semi-reinforcing furnace (SRF) and fast extrusion furnace (FEF), 1 to 5 PHR of crosslinking auxiliary, 1 to 2 PHR of stearic acid, calcium hydroxide 5 to 10 PHR, dioctyl adipate (DOA) 2 to 10 PHR,
The para-aramid staple fiber is a fiber-
Wherein the aramid fibers are surface-treated with para-aramid fibers by RFL (resorcinol formaldehyde latex) and uniformly cut to 1 to 6 mm.
KR1020140161901A 2014-11-19 2014-11-19 Rubber composite diffused para-aramid fiber for rubber's reinforcement and manufacturing method thereof KR20160060252A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180061611A (en) * 2016-11-30 2018-06-08 주식회사 대영특수고무 manufacturing method of sealing parts having high durability using chopped para-aramid fiber
KR20190067365A (en) 2017-12-07 2019-06-17 다이텍연구원 Manufacturing method of heat resistance automobile hoses using surface-modified aramid fabric as an reinforcement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180061611A (en) * 2016-11-30 2018-06-08 주식회사 대영특수고무 manufacturing method of sealing parts having high durability using chopped para-aramid fiber
KR20190067365A (en) 2017-12-07 2019-06-17 다이텍연구원 Manufacturing method of heat resistance automobile hoses using surface-modified aramid fabric as an reinforcement

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