KR101362196B1 - automobile coolant hose reinforced with hybrid fiber code and method of manufacturing the same - Google Patents

Abstract

In the hose, a fiber reinforcement layer is formed on the outer circumferential surface of the rubber layer forming the inner layer of the hose, and a rubber layer is formed on the outer circumferential surface of the fiber reinforcement layer, and the compounded rubber of the rubber layer forming the inner layer and the outer layer is EPDM 100. Part by weight, 80 to 100 parts by weight of carbon black, 20 to 60 parts by weight of coated calcium carbonate, 3 to 7 parts by weight of anti-aging agent, 1 to 4 parts by weight of vulcanizing agent and 8 to 12 parts by weight of vulcanization accelerator, the fiber reinforcing material The layer is an automobile cooling water hose formed by combining 800-1200 denier aramid fibers and 200-1000 denier polyester fibers.
The hose of the present invention has excellent adhesive strength between the rubber layer and the fiber reinforcement layer so that the hose exhibits heat resistance, strength, elongation, shape stability, and fatigue resistance characteristics of the fiber reinforcement layer well in the hose. It is resistant to high temperature antifreeze and its shape remains stable even under the influence of vibration of engine compartment at high temperature, so it can be used for a long time even in the harsh environment inside the engine compartment.
In addition, by using the same compounding rubber in the inner layer and the outer layer, the work is simplified, the flowability of the compounding rubber is good, the pot life is increased, the hose forming processability is excellent, and the productivity is improved.

Description

Automotive coolant hose reinforced with hybrid fiber code and method of manufacturing the same

The present invention relates to a hose for automobile coolant reinforced with a composite fiber cord, and more particularly, for automotive coolant having excellent adhesion between the mechanical properties of the hose and a fiber reinforcement layer composed of a rubber and a composite fiber cord constituting the hose. It's about hoses.

Cooling water hoses applied to automobiles are applied to a heater or a radiator constituting the cooling system of the vehicle to interconnect the cooling system and the engine to enable cooling water circulation.

The coolant hose is located in the engine compartment. In recent years, the interior of the engine compartment is narrowed by streamlined design to improve the fuel efficiency and performance of the vehicle. Will receive.

In addition, in order to improve fuel efficiency of automobiles, it is required to reduce the weight of automobile parts, and as the engine compartment becomes complicated, automobile parts and hoses have to be arranged in a narrow space, and thus the use of the curved hose is increasing.

If an abnormality such as cracking or degeneration occurs in the cooling water hose due to the above effect, the cooling water is leaked between the cracks, or becomes vulnerable to minute cracking and deterioration, so that the hose cannot bear the pressure of the cooling water flowing at high pressure. There is a risk of rupture.

As such, if the coolant cannot be smoothly distributed due to damage to the coolant hose while driving, a significant cost burden is caused by causing fatal damage such as damage to the engine due to abnormalities such as overheating of the engine. Becomes

In order to solve this problem, there are many ways to make the life of the cooling water hose longer than that of the engine.

Republic of Korea Patent Publication No. 687692 has a compound rubber of a hose for automobile cooling water, which is a compound rubber with carbon black as a reinforcing material has a high insulation properties against the surface current generated in the electrical equipment in the engine compartment. Therefore, the durability of the hose can be improved by preventing cracking of the electric aging phenomenon, but the improvement of the aging rupture characteristic due to the long-term exposure to high temperature and high pressure cooling water remains a problem.

Korean Patent Publication No. 648015 describes a cooling system hose for automobiles, which includes EPDM (ethylene propylene diene) as a main component and includes a reinforcing layer composed of aramid fibers between them. Although the chemical property is excellent, the improvement of aging rupture characteristics still remains a problem due to the low elongation and the low fatigue resistance caused by the vibration of high temperature engine compartment.

In addition, EPDM is not easy to bond with aramid fibers because of the lack of reactivity, there is a problem that the manufacture of the hose for automotive cooling water with increased properties by the fiber reinforcement layer was not easy.

The present invention is to solve the above problems, to increase the mechanical strength, such as aging rupture characteristics in the hose for automotive cooling water and to improve the adhesive strength of the fiber reinforcement layer and the compounded rubber by the fiber cord in the hose It is an object to provide a hose and a method of manufacturing the same.

In the hose including the inner layer, the fiber reinforcement layer and the outer layer,

A fiber reinforcement layer is formed on an outer circumferential surface of the rubber layer forming an inner layer of the hose, and a rubber layer forming an outer layer of the hose is formed on the fiber reinforcement layer.

Compound rubber of the rubber layer forming the inner layer and the outer layer is 80 to 100 parts by weight of carbon black to 100 parts by weight of EPDM, 20 to 60 parts by weight of calcium carbonate coated with fatty acid, 3 to 7 parts by weight of antioxidant, 1 to 4 vulcanizing agents It is made by mixing 8 parts by weight to 12 parts by weight and a vulcanization accelerator,

Extruding the inner layer rubber layer using the compound rubber;

In order to form a fiber reinforcement layer on the outer circumferential surface of the extruded inner rubber layer, the spirals are sequentially braided by two weaving machines that rotate in different directions instead of braiding the fiber cords alternately. (Spiral) first composite fiber cord is wound in one direction on the outer circumferential surface of the inner layer rubber layer, and the composite fiber cord is wound so that the crossing angle formed when another composite fiber cord crosses the wound composite fiber cord for the first time is 85 to 110 degrees. Forming a fiber reinforcement layer by braiding the area inside the mesh formed by the intersection of 50 to 70 mm ² ;

Extruding an outer layer rubber layer using the compound rubber on the braided fiber reinforcement layer; And

The inner layer, braided fiber reinforcing material layer and the outer layer integrally steam vulcanized at a temperature of 155 ~ 165 ℃ for 10 to 40 minutes; provides a hose for automobile cooling water reinforced with a composite fiber cord comprising a and a method of manufacturing the same. .

The hose for the automotive coolant has excellent adhesive strength between the rubber layer and the fiber reinforcement layer, so that the hose exhibits excellent heat resistance, strength, elongation, form stability, and fatigue resistance characteristics in the hose. It is strong and resistant to high temperature antifreeze and its shape remains stable even under the influence of vibration of engine compartment at high temperature, so it can be used for a long time even in the harsh environment inside the engine compartment.

In addition, by using the same compounding rubber in the inner layer and the outer layer, the work is simplified, the flowability of the compounding rubber is good, the pot life is increased, the hose forming processability is excellent, and the strength and elongation of the composite fiber cord is excellent, Productivity is improved in braiding the said composite fiber cord on the inner peripheral rubber layer outer peripheral surface to form, and forming a fiber reinforcement layer.

1 is a hose for automobile cooling water produced by the present invention.
2 is a conceptual diagram of a hose structure for automobile coolant according to the present invention.
Figure 3 is a photograph of the composite fiber cord according to the present invention braided on the inner layer rubber layer.

In the automotive cooling water hose including the inner layer, the fiber reinforcement layer, and the outer layer, since the inner rubber layer is in direct contact with the water-based antifreeze, hydrolysis resistance, heat resistance, water vapor permeability, etc. are required, and the outer rubber layer has oil resistance, Heat resistance and the like are required.

Compounding rubbers forming the inner and outer rubber layers of the present invention in order to manufacture the hose for automobile cooling water having the characteristics required in the inner and outer layers include carbon black, fillers, antioxidants, vulcanizing agents and vulcanization accelerators in addition to the rubber components. .

It is preferable to use EPDM as the rubber component. EPDM, unlike other rubbers, has no double bonds in the main chain and thus has better heat resistance, weather resistance and electrical resistance than other rubbers having double bonds, and the contents inside the hose such as antifreeze permeate. It is difficult to do so it can be used in more harsh environments.

EPDM used in the present invention is preferably 56 to 62% by weight of the ethylene constituting the EPDM because it is easy to workability, mechanical properties are increased and may contain a large amount of filler in the rubber compound.

The carbon black controls the tensile strength and hardness of the compounded rubber, and when used with the EPDM, it is possible to improve the flex resistance of the compounded rubber.

The carbon black preferably includes 80 to 100 parts by weight based on 100 parts by weight of the EPDM. If the carbon black is less than 80 parts by weight, the tensile strength is lowered. If the carbon black is more than 100 parts by weight, the hardness is high and the elongation is lowered, which is not preferable because the flexibility is reduced as a hose. It is preferable that the average particle size of the carbon black is 50 to 100 nm.

The filler is used for reinforcing the mechanical strength and hardness that occur when the compounding rubber is vulcanized by the vulcanizing agent. In the present invention, it is preferable to use coated calcium carbonate having good dispersibility in the compounding rubber.

Calcium carbonate is the most used material for reinforcing the mechanical strength of rubber and polymers, and in the present invention, as a more effective method for reinforcing the mechanical strength, reactive functional groups are formed to form chemical bonds between rubber and polymer and calcium carbonate. Coated calcium carbonate is used.

The coated calcium carbonate is excellent in adhesion with various polymer fibers by its reactive functional groups, and excellent in dispersibility in rubber and polymers, thereby exhibiting excellent processability when preparing compound rubber or when molding the compound rubber.

The coated calcium carbonate improves the dispersibility of carbon black in the compounding rubber manufacturing process, and thus the calcium carbonate and carbon black are uniformly distributed in the compounding rubber, thereby adhering to the composite fiber cord forming the fiber reinforcing material layer of the present invention. Can be increased.

The coating agent of the coated calcium carbonate is preferably at least one selected from the group consisting of stearic acid, palmitic acid, lauric acid and oleic acid as fatty acids.

The coated calcium carbonate preferably contains 20 to 60 parts by weight based on 100 parts by weight of the EPDM. If the coated calcium carbonate is less than 20 parts by weight, the mechanical strength such as flexural modulus and impact strength is not improved, and there is a lack of reactive functional groups in the compounded rubber. The heat resistance is lowered, and when it exceeds 80 parts by weight, the flexibility of the rubber is lowered and the workability is worsened.

The average particle size of the coated calcium carbonate is preferably 0.04 ~ 1.50 ㎛. When the particle size is less than 0.04 μm or more than 1.50 μm, the dispersion density of the coated calcium carbonate in the compounding rubber becomes small, which is undesirable because the mechanical strength of the hose and the adhesion between the compounding rubber and the fiber reinforcing layer are reduced.

Since the coated calcium carbonate is precipitated calcium carbonate having a high purity and good dispersion in the compounded rubber, it is possible to improve adhesion between the rubber layer and the fiber reinforcement layer in the hose.

The anti-aging agent is used in the dibutyl dithio carbamate-nickel (II) to prevent the aging of rubber products and to extend the life of the rubber product, 3 to 7 parts by weight based on 100 parts by weight of EPDM rubber It is preferable to be.

Sulfur is used as a material to increase the elasticity by causing a chemical crosslinking reaction between the rubber molecules, wherein the vulcanization process using the sulfur is made for 10-40 minutes at a temperature of 155 ~ 165 ℃ The vulcanization temperature and the vulcanization pressure can be changed according to the quality of the rubber product required, and this vulcanization process can be carried out several times as necessary.

The sulfur functions to improve dispersion during processing of the product and improve mechanical properties and heat resistance by single or double sulfur crosslinking. At this time, sulfur is preferably added 1 to 4 parts by weight based on 100 parts by weight of EPDM rubber, when the sulfur is added less than 1 part by weight, the room temperature durability of the product is significantly lowered, if more than 4 parts by weight of uncrosslinked sulfur surface May cause the product to turn yellow.

The vulcanization accelerator is used together with the vulcanizing agent to promote the crosslinking of sulfur, and in the present invention, as a vulcanization accelerator, zinc oxide (ZnO), zinc dibutyldithiocarbamate and N- (cyclohexylthio). It is preferable to use at least one selected from the group consisting of N- (cyclohexylthio) phthalimide.

At this time, the zinc dibutyl dithio carbamate system is BZ-zinc dibutyl dithio carbamate and PZ-zinc dimethyl dithio carbamate.

The compounding rubber of the present invention may further include other ingredients in a degree that does not impair the advantages of the present invention in addition to the compounding rubber component. Examples of such components may include softening agents (such as paraffin oil), plasticizers, processing aids, retardants, antioxidants and pigments.

The fiber reinforcement layer maintains the skeleton of the hose, and serves to improve the strength, form stability, and heat resistance in the hose, conventionally used polyester, nylon, rayon and vinylon fibers, but the hose for automotive cooling water As the environment of using is severe, a fiber reinforcement layer using fibers having higher strength and high heat resistance is required.

For example, rubber hoses reinforced with vinylon fibers may cause damage to the hoses due to fiber deterioration at high temperatures of 135 ° C. or higher, and thus have problems in long-term heat resistance. Therefore, excellent properties such as high strength, high heat resistance, high elongation, and low shrinkage Rubber hoses using aramid fibers having a fiber reinforcement layer were used.

However, the hoses used in the engine compartment of automobiles use EPDM, which has high temperature characteristics in terms of rubber material. EPDM is not easy to bond with aramid fibers due to lack of reactivity, has low elongation, and is economically disadvantageous in terms of economy. There is this.

On the other hand, polyester fiber has proper elongation and excellent fatigue resistance and form stability than other fibers, so it can improve the durability and structural stability performance of the hose when used as a fiber reinforcement layer in the hose, strength, modulus, dimensional stability Its properties are balanced and it is the most widely used material because of its excellent adhesion with rubber and low cost.

In order to form a fiber reinforcement layer, it is preferable to use a fiber cord in which several strands of fibers are twisted together.

In the present invention, in order to form a fiber reinforcing material layer of 800 ~ 1200 denier aramid fibers and 200 ~ 1000 denier polyester fibers are spliced and twisted 60 ~ 100 TPM (Twist Per meter) and then coated with a dipping solution containing a resorcinol-formalin compound and heat treated. The composite fiber cord has a tensile strength of 13 to 20 Kgf / cm ² and an elongation at break. It is preferable because it has a property of 2.5 to 3.5% and an adhesive strength of 2.5 to 8.5 Kgf / cm, and has a balanced property of strength and elongation without losing the advantages of aramid fiber and polyester fiber.

If the aramid fiber is less than 800 denier, the strength and heat resistance of the hose is lowered, if it is 1200 denier or more, elongation and fatigue resistance is lowered, the rubber layer and adhesive force is lowered, which is undesirable.

When the polyester fiber is less than 200 denier, when the hose is manufactured from a composite fiber cord that is thinned and filamented, the increase in elongation, fatigue resistance and shape stability characteristics of the hose is insignificant, and the adhesion to the rubber layer is lowered. Exceeding denier lowers the strength and heat resistance, which is undesirable.

It is preferable that the twisted yarn has a twist number of 60 to 100 TPM in the composite fiber cord. The twisted number is for maximizing the physical properties of each filament. In general, the higher the number of twists of the fibers, the lower the strength, but the fatigue resistance increases, while the lower the number of the twists increases the strength, while Endurance performance is reduced. Therefore, in the present invention, by limiting the number of twists in the above range, the properties suitable for use as the fiber reinforcement layer of the hose, that is, modulus, shrinkage, elongation at break and strength are adjusted.

The automotive cooling water hose is preferably 2.5 ~ 3.5 mm thickness of the inner layer rubber layer and 1.5 ~ 2.0 mm thickness of the outer rubber layer.

When the thickness of the inner rubber layer is less than 2.5 mm, the braiding workability for forming the fiber reinforcement layer is lowered, the adhesion between the fiber reinforcement layer and the rubber layer is lowered, and the mechanical strength is lowered as an automotive cooling water hose. If the heat resistance and mechanical strength increase by the lower surface of the fiber reinforcing material layer is insignificant, the flexibility of the hose is lowered. If the thickness of the outer rubber layer is less than 1.5 mm, the mechanical strength is lowered, and if it exceeds 2.0 mm, the flexibility is lowered, which is not preferable.

The manufacturing method of the automotive cooling water hose

Extruding the inner layer rubber layer using the compound rubber;

In order to form a fiber reinforcement layer on the outer circumferential surface of the extruded inner layer rubber layer, the spiral yarns of two weaving machines that rotate in different directions are sequentially braided, and the first composite fiber cord is wound around the outer circumferential surface of the inner layer rubber layer in one direction and the other composite fibers When the cord crosses the wound composite fiber cord for the first time, the crossing angle formed is 85 to 110 degrees and the inner side of the mesh formed by the crossover of the composite fiber cord is braided to have an area of 50 to 70 mm ^2. Forming a fiber reinforcement layer;

Extruding an outer layer rubber layer using the compound rubber on the braided fiber reinforcement layer; And

Preferably, the inner layer, the fiber reinforcement layer and the outer layer are integrally formed with steam vulcanization at a temperature of 155 to 165 ° C for 10 to 40 minutes.

Extrusion of the inner layer and the outer rubber layer may be carried out according to conventionally known conditions.

When braiding the composite fiber cord on the outer circumferential surface of the inner layer rubber layer, it is not braided while crossing the fiber cords with each other, but braided by a spiral method in which two looms rotating in different directions are braided sequentially. This is preferable because it can improve the burst strength and improve the productivity of the hose production.

In addition, the fiber cord used in the present invention is a heterogeneous composite fiber cord obtained by weaving aramid and polyester fibers and weaving the composite fiber cord so that the composite fiber cord does not slip on the rubber layer when braided in the spiral method. The slippage is small even between the cords, showing a uniform braid structure and excellent workability.

When the composite fiber cord is braided on the outer circumferential surface of the inner layer rubber layer, when the crossing angle of the composite fiber cord is less than 85 degrees, workability for braiding is lowered. When it exceeds 110 degrees, the effect of increasing the tensile strength and elongation of the hose is insignificant. Not desirable

When braiding the composite fiber cord to the outer circumferential surface of the inner layer rubber layer, if the area inside the mesh formed by the intersection of the composite fiber cord is less than 50 mm ^2, the flexibility of the hose is reduced, and if it exceeds 70 mm ² , the mechanical strength of the hose is improved. This is negligible and undesirable.

Hereinafter, the present invention will be described in detail with reference to Examples. It is to be understood, however, that the invention is not to be construed as limited to the embodiments set forth herein, but is capable of modifications and equivalents within the spirit and scope of the invention. Will be apparent to those skilled in the art to which the present invention pertains.

(1) Mooney viscosity

The viscosity of the unvulcanized rubber measured by a Mooney viscometer is measured by using a rotor at 121 ° C, and the value after 1 to 4 minutes of preheating is measured and expressed as ML1 + 4 (121 ° C).

(2) Scorch time

Scorching is a phenomenon in which compounding rubber decreases plasticity during processing prior to storage or vulcanization, making it impossible to process. Scorching time is measured using a Mooney viscometer for the time required to rise 5 points from the lowest viscosity to the Mooney unit.

(3) normal temperature burst pressure

According to GM's test standard GMW14329, the water is filled in the hose at room temperature (23 ℃), and the bursting pressure is measured by applying water pressure at a pressure rate of 0.51 ± 0.05 kg / cm ² per second.

(4) high temperature burst pressure

According to GM's test standard GMW14329, the burst pressure is measured by applying water pressure at a pressurization rate of 0.51 ± 0.05 kg / cm ² at high temperature (110 ° C).

(5) aging burst pressure

According to GM's test standard GMW14329, after 168 hours of heat treatment in an oven of high temperature (125 ℃), take out the water, fill the hose with water, and measure the burst pressure by applying water pressure at a pressure rate of 0.51 ± 0.05 kg / cm ² per second.

(6) adhesion

A 100 mm long sample is taken from the fiber cord reinforced and vulcanized hose and the hose is cut in the axial direction of the hose and the cut hose is then flattened. Peel strength is measured by grabbing the outer rubber layer and inner rubber layer of the flattened hose and opening the outer rubber layer and inner rubber layer to each jig.

<Examples 1 and 2>

In a Banbury mixer, the mixture was prepared by mixing EPDM, carbon black, coated calcium carbonate, and an antioxidant as shown in Table 1 below for 2 minutes at a ram pressure of 5.5 Kgf / cm ² and a stirring speed of 30 rpm. It was.

Then, the kneader was added to the kneaded mixture and the vulcanizing agent and the vulcanizing accelerator of Table 1 to prepare a final compounded rubber, and the physical properties thereof are shown in Table 2 below.

Composite fiber cords provide a one-to-one supply of aramid fibers (1000 denier / 1 filament, strength 18 g / d, elongation 3.2%) and polyester fibers (250 denier / 1 filament, strength 4 g / d, elongation 16%) Plywood into two and twisted to 60 TPM twist, coated with a dipping solution containing the resorcinol-formalin compound and heat-treated at 230 ℃, tensile strength 18 Kgf / cm ² , breaking elongation 3.0%, adhesion Composite fiber cords having physical properties of 3.8 Kgf / cm were prepared.

The compound rubber is extruded using an extrusion molding machine for manufacturing a hose to form an inner layer rubber layer having an inner diameter of 34 mm and a thickness of 3.0 mm, and the composite fiber cord is spun by a weaving machine on the inner layer rubber layer. Has a cross angle of 108 degrees and braids an area inside the mesh of the high performance composite fiber cord to be 64 mm ² to form a fiber reinforcement layer, and extrudes the blended rubber so as to have a thickness of 1.5 mm as an outer layer on the fiber reinforcement layer. To produce a composite fiber cord reinforcement hose.

The hose was steam vulcanized at a temperature of 160 ° C. for 20 minutes to manufacture a hose for automobile cooling water, which was finally reinforced with a composite fiber cord, to evaluate room temperature, high temperature, rupture pressure, and adhesion between the inner and outer rubber layers and the fiber cord. The results are shown in Table 3 below.

<Comparative Examples 1 and 2>

The same method as in Example 1 was performed except that the coated calcium carbonate was removed (Comparative Example 1) and the coated calcium carbonate was increased (Comparative Example 2) as shown in Table 1 below. To prepare a hose for automobile cooling water.

&Lt; Comparative Example 3 &

Except for using 120 denier polyester fiber in the high performance composite fiber cord in Example 1 was prepared in the same manner as in Example 1 the cooling water hose.

<Comparative Example 4>

Except for using 1260 denier polyester fiber in the high performance composite fiber cord in Example 1 was prepared in the same hose as in Example 1 for the cooling water hose.

Compound rubber content (unit: parts by weight) division Example 1 Example 2 Comparative Example 1 Comparative Example 2 EPDM ¹⁾ 100 100 100 100 Carbon black ²⁾ 100 100 100 100 Coated calcium carbonate ³⁾ 30 50 0 80 Anti-aging agent ⁴⁾ 5 5 5 5 Vulcanizer ⁵⁾ 2 2 2 2 Vulcanization accelerator ⁶⁾ 10 10 10 10

1) EPDM, KEP-270, Kumho Polychem with 57% by weight of ethylene

2) N550, OCI Corporation

3) chlorochloride SF, copper Calcium

4) Vulkanox HS / LG, LANXESS, Germany

5) Sulfur, Sewang Chemical

6) Zinc Oxide, Hanil Chemical

Compound Rubber Properties division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Mooney Viscosity (ML1 + 4 (121 ℃)) 64 65 72 74 Scorch (minutes) 26 24 18 20

Since the flowability of the compounding rubbers of Examples 1 and 2 is better than Comparative Examples 1 and 2 from the Mooney viscosity property values of Table 2, the Examples 1 and 2 have a longer pot life than the Comparative Examples 1 and 2 from the scorch time. It can be seen that Examples 1 and 2 are more excellent in hose molding processability.

Physical properties of the hose for cooling water (burst pressure unit: MPa, adhesion unit: kgf / cm) Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Room temperature burst pressure 2.27 2.29 2.22 2.23 2.12 2.14 High temperature burst pressure 1.74 1.75 1.66 1.71 1.61 1.58 Aging burst pressure 2.22 2.24 2.19 2.20 2.17 2.18 Adhesion 2.5 2.3 1.0 2.7 0.7 1.5

In the results of Table 3, Examples 1 and 2 are excellent at room temperature burst pressure, high temperature burst pressure, aging burst pressure, and adhesive strength, and as the content of the coated calcium carbonate increases, the adhesive strength and mechanical strength increase, so as to be used as a hose for automobile cooling water. I found out.

On the other hand, in Comparative Example 1, in the absence of calcium carbonate coated in the compounding rubber, the adhesion between the rubber layer and the fiber reinforcement layer is lowered, and thus the physical properties of the high-performance composite fiber cord are not sufficiently transferred to the rubber layer. It was found that the pressure characteristics were lowered.

In Comparative Example 2, when the coated calcium carbonate is too much, the Mooney viscosity is increased, the flowability is lowered, the productivity of the hose is lowered, the hardness is too high, and the aging burst pressure is reduced.

In Comparative Examples 3 and 4, it was found that the mechanical strength and adhesive strength of the hose decreased more than the change of the coated calcium carbonate of the compounded rubber according to the day of the polyester fiber constituting the composite fiber cord. .

1: inner layer rubber layer 2: fiber reinforcement layer
3: outer layer rubber layer 4: composite fiber cord

Claims (6)

In the hose including the inner layer, the fiber reinforcement layer and the outer layer,
A fiber reinforcement layer is formed on an outer circumferential surface of the rubber layer forming the inner layer of the hose and includes a rubber layer forming the outer layer of the hose on the fiber reinforcement layer,
Compound rubber of the rubber layer forming the inner layer and the outer layer is 80 to 100 parts by weight of carbon black to 100 parts by weight of EPDM, 20 to 60 parts by weight of calcium carbonate coated with fatty acid, 3 to 7 parts by weight of antioxidant, 1 to 4 vulcanizing agents It is made by mixing 8 parts by weight to 12 parts by weight and a vulcanization accelerator,
The fiber reinforcing material layer is a hose for automobile cooling water reinforced by a composite fiber cord, characterized in that the composite fiber cord made of a combination of 800 ~ 1200 denier aramid fibers and 200 ~ 1000 denier polyester fibers. The method of claim 1,
The calcium carbonate coated with the fatty acid has a particle size of 0.04 to 1.50 μm, and the surface of the calcium carbonate is coated with at least one selected from the group consisting of stearic acid, palmitic acid, lauric acid and oleic acid. Automotive coolant hoses reinforced with composite fiber cords. delete The method of claim 1,
The hose is 2.5 ~ 3.5 mm thickness of the inner layer rubber layer and the thickness of the outer layer rubber layer is a hose for automobile cooling water reinforced with a composite fiber cord, characterized in that. 80 to 100 parts by weight of carbon black, 20 to 60 parts by weight of calcium carbonate coated with fatty acid, 3 to 7 parts by weight of antioxidant, 1 to 4 parts by weight of vulcanizing agent and 8 to 12 parts by weight of vulcanization accelerator Extruding the inner layer rubber layer using the compounding rubber;
The composite fiber cord in which 800-1200 denier aramid fibers and 200-1000 denier polyester fibers are spliced onto the outer circumferential surface of the extruded inner layer rubber layer has a cross angle of 85 to 110 degrees in a spiral manner. Forming a fiber reinforcement layer by braiding an area inside the mesh formed by the intersection of the composite fiber cords so as to be 50 to 70 mm ² ;
Extruding an outer layer rubber layer using the compound rubber on the braided fiber reinforcement layer; And
The method of manufacturing a hose for automobile cooling water reinforced with a composite fiber cord comprising the step of steam vulcanization at a temperature of 155 ~ 165 ℃ for 10 to 40 minutes integrally the inner layer, braided fiber reinforcement layer and the outer layer. 6. The method of claim 5,
The composite fiber cord is braided with aramid fibers and polyester fibers and twisted at a twist rate of 60 to 100 TPM, and then coated with a dipping solution containing a resorcinol-formalin compound. Method for manufacturing a receiving hose.

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