KR101752236B1 - Silicone oil rubber composition of waterproof seals for automobile wiring harness seal and molded articles made therefrom - Google Patents

Abstract

The present invention relates to a waterproof seal silicone oil rubber composition for an automobile wiring harness and a waterproof seal molded article for a wiring harness manufactured from the same. More particularly, the present invention relates to a waterproof seal silicone oil composition for automobile wiring harness, A waterproof seal silicone oil rubber composition for an automobile wiring harness having excellent waterproofness and airtightness at the same time, and a waterproof seal molded article for a wiring harness made thereof.
A waterproof seal silicone oil rubber composition for automobile wiring harness according to the present invention comprises 10 to 30 parts by weight of a silica filler per 100 parts by weight of a polyorganosiloxane; 0.5 to 3 parts by weight of a silane coupling agent; 0.5 to 5 parts by weight of silicone oil; 0.1 to 3 parts by weight of a crosslinking agent; And 0.1 to 3 parts by weight of an internal release agent.

Description

Technical Field [0001] The present invention relates to a waterproof seal for an automobile wiring harness, and more particularly, to a silicone oil rubber composition and a waterproof seal formed body for a wiring harness made therefrom,

The present invention relates to a waterproof seal silicone oil rubber composition for an automobile wiring harness and a waterproof seal molded article for a wiring harness manufactured from the same. More particularly, the present invention relates to a waterproof seal silicone oil composition for automobile wiring harness, A waterproof seal silicone oil rubber composition for an automobile wiring harness having excellent waterproofness and airtightness at the same time, and a waterproof seal molded article for a wiring harness made thereof.

In recent years, the development of materials technology and the integration of IT technology in automobiles have led to rapid progress in electric field. The increase of electrical products leads to an increase in total dose and leads to an increase in the number of connectors that serve as electrical connection points for electrical products. The total length of the electric wire applied to the vehicle is about 1500 m on average per vehicle, and about 400 to 700 connectors are used depending on the type of vehicle.

If the electric conductivity of the wire and the reliability of the connection port are not secured due to the increase of the electric wire and the connector, various electric problems may be caused. For this reason, the electric wire of the automobile must have low conductor resistance, oil resistance, flame retardance, abrasion resistance and lightness .

Automobile wires are mounted with bundles of wires and wires, that is, wire harnesses (bundles of wires), in order to distinguish them according to the system and circuit to be used.

Automotive connectors are parts that serve as connection points for connecting electric wires and wires of a wire harness and electric wires of a wire harness and electrical parts to constitute an electric circuit. They are classified into non-return connectors and waterproof connectors according to their mounting positions.

Waterproof connectors should be protected with silicone wire seal or inner seal rubber to prevent corrosion when the connector and connector are exposed to water or moisture.

In the case of conventional automotive connector seals, silicone rubber seals are used because they are used in combination with a tap terminal and a receptacle terminal, thereby ensuring durability, water resistance, vibration characteristics, electrical characteristics and sealing properties.

Silicone rubber seals have excellent durability and waterproof performance, but tear characteristics of the physical properties are very weak. Therefore, it has been difficult to assemble the connector housings due to tearing or breakage of the silicone rubber seals when connecting terminals and wires.

Accordingly, there has been an attempt to improve slipability and assemblability by developing and manufacturing oil-bridged silicone rubber by adding silicone oil to the raw material silicone rubber so as to smoothly assemble with the connector housing.

Due to the lack of technical know-how in the development of domestic oil-bridged silicone rubber material technology, it is in a state of lagging behind advanced countries. Most oil-bonded silicone rubber materials currently in use depend on imports. It is urgent to develop an optimum compounding ratio and crosslinking conditions that meet the requirements of < RTI ID = 0.0 >

Conventionally, Korean Patent No. 10-1106521 discloses a polyorganosiloxane composition applied to an electric wire or cable protected from a fire. However, the polyorganosiloxane composition contains platinum and is destroyed by compounds such as phosphorus, nitrogen, and tin And the heat resistance is adversely affected, and the addition of a large amount of the filler has a problem in that it is not suitable for automobile wire harness waterproof connector seal silicone rubber because it has poor workability and moldability.

Korean Patent No. 10-1106521 (High temperature curable polyorganosiloxane composition which is essentially used in the production of electric wire or cable)

An object of the present invention to solve the above problems is to provide a waterproof seal silicone oil rubber composition for automobile wiring harness having improved water resistance and airtightness while preventing tearing and breakage of the connector by improving slip property will be.

A waterproof seal silicone oil rubber composition for automobile wiring harness according to the present invention for solving the above problems is characterized by comprising 10 to 30 parts by weight of a silica filler based on 100 parts by weight of a polyorganosiloxane; 0.5 to 3 parts by weight of a silane coupling agent; 0.5 to 5 parts by weight of silicone oil; 0.1 to 3 parts by weight of a crosslinking agent; And 0.1 to 3 parts by weight of an internal release agent.

The silica filler is a dry silica having a specific gravity of 2 to 3, a compression density of 500 to 700 kg / m 3, a non-compressive density of 400 to 600 kg / m 3, an average particle size of 20 nm to 50 μm, do.

The silane coupling agent may be at least one selected from the group consisting of a vinyl silane coupling agent, an alkoxysilane coupling agent, an aminosilane coupling agent, an epoxy silane coupling agent, a methacryloxy silane coupling agent, an acryloxy silane coupling agent, a ureido silane coupling agent, a mercaptosilane coupling agent, And a group selected from a combination of these.

The silicone oil may be selected from the group consisting of methylhydroxide siloxane, vinyl methylhydroxide siloxane, hexamethyldisilazane, 1,4-divinyltetramethyldisilazane, dimethyl silicone oil, methylphenylsiloxane, diphenylsiloxane and combinations thereof And is selected from among the groups selected.

The crosslinking agent may be selected from the group consisting of 2,5-dimethyl-2,5-di- (tert-butylperoxy) -hexane, Dicumyl peroxide, 1,1-di- (tert-butylperoxy) -3,3,5-trimethylcyclohexane, tert-butyldioxy valerate, dibenzoyl peroxide, tert-butyl peroxybenzoate, di- (2-tert-butyl-peroxyisopropyl) -benzene, tert-butylcumylperoxide, -di (tert-butylperoxy) hexyme-3.

Wherein the internal release agent is any one of fatty acid ester, metal soap, polyethylene wax, polypropylene wax, and combinations thereof.

Wherein the composition further comprises 1 to 5 parts by weight of an inorganic and organic vulcanization accelerator auxiliary per 100 parts by weight of the polyorganosiloxane.

The inorganic vulcanization accelerator aid is characterized by having an average particle size of 0.3 to 0.6 mu m.

In order to solve the above-mentioned problems, the waterproof seal molding for automobile wiring harness formed by using the waterproof seal silicone oil rubber composition for automobile wiring harness of the present invention has a temperature of 160 to 180 DEG C, a pressure of 130 to 150 kgf / 180 to 220 seconds, and one or two times of degassing.

INDUSTRIAL APPLICABILITY As described above, according to the waterproof seal silicone oil rubber composition for automobile wiring harness according to the present invention and the waterproof seal molded article for wiring harness made therefrom, the slip property is improved to prevent tearing and breakage of the connector when fastened At the same time, it has an effect of having excellent waterproof property and airtightness.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.
2 is an automotive connector inner seal formed article according to the present invention.
Fig. 3 is a molded product of the automotive connector dummy seal according to the present invention. Fig.

Specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. The detailed description of the functions and configurations of the present invention will be omitted if it is determined that the gist of the present invention may be unnecessarily blurred.

The present invention relates to a waterproof seal silicone oil rubber composition for automobile wiring harness, and more particularly, to a waterproof seal silicone oil rubber composition for automobile wiring harness. More specifically, the present invention relates to a waterproof seal silicone oil rubber composition for automobile wiring harness, A waterproof seal for a wiring harness, and a molded article using the same.

A waterproof seal silicone oil rubber composition for automobile wiring harness according to the present invention comprises 10 to 30 parts by weight of a silica filler, 0.5 to 3 parts by weight of a silane coupling agent, 0.5 to 5 parts by weight of a silicone oil, 0.1 to 3 parts by weight of a crosslinking agent, and 0.1 to 3 parts by weight of an internal release agent.

Hereinafter, the silicone rubber composition of the present invention will be described in detail.

Polyorganosiloxane

Specific examples of the polyorganosiloxane according to the present invention include, but are not limited to, polymethylvinylsiloxane, polydimethylsiloxane, polymethylphenylsiloxane, and the like.

More preferably, polymethylvinylsiloxane containing a vinyl group can be used to improve physical properties such as heat resistance and strength.

In this case, polymethylvinylsiloxane having a siloxane unit of 5,000 to 10,000, n of 3,000 to 5,000, a vinyl group content of 0.1 to 0.3 mol%, and an MW of 370,000 to 740,000 are used. Under the above conditions, the physical properties and processability can be excellent.

The polyorganosiloxane may preferably have a viscosity of 10,000,000 cps to 150,000,000 cps measured at 25 ° C in consideration of the dispersibility and ease of processing of the silica filler.

Silica filler

The silica filler is added to improve physical properties such as tensile strength and hardness, and the silica filler can use fumed silica having a relatively low incidence of yellowing phenomenon. The silica filler may be one of hydrophobic dry silica and hydrophilic dry silica Or more can be used.

More preferably, the silica filler of the present invention is characterized by using dry silica that has not been subjected to surface treatment.

The surface-treated silica filler is used for liquid silicone rubber (LSR: Liquid Silicone Rubber), and crosslinking proceeds by an addition reaction by a platinum catalyst. The platinum catalyst is disadvantageous in that it is easily broken when it comes into contact with a compound containing sulfur, phosphorus, nitrogen or the like and can not serve as a catalyst, and also acts as an oxidation catalyst itself, resulting in lowering of physical properties such as heat resistance.

Further, since the surface treatment is performed, the content of the silane coupling agent with respect to the silica filler content can not be controlled.

On the other hand, the unfaced silica filler is applied to solid silicone rubber, ie, thermosetting silicone rubber, and mirrorable silicone rubber (HTV: High Temperature Vulcanizing), which is crosslinked by a radical reaction using organic peroxide, The catalyst stability is excellent.

Further, since the content of the silane coupling agent can be controlled, the reactivity between the silica filler and the resin can be improved or controlled.

The silica filler has a Specific Gravity of 2 to 3, a Bulk density compacted (Tapped Density) of 500 to 700 kg / m 3, and a Bulk density uncompacted (Loose Density) of 400 to 600 kg / The mechanical properties can be excellent under the conditions.

The silica filler has an average particle size of 20 nm to 50 탆, more preferably 1 to 5 탆, and is easy to be dispersed in the above range, so that workability and strength can be improved.

The silica filler is contained in an amount of 10 parts by weight to 30 parts by weight with respect to 100 parts by weight of the polyorganosiloxane. When the silica filler is contained in an amount of less than 10 parts by weight, the mechanical properties of the present invention are poor. If contained, aggregation occurs between each other and the dispersibility may deteriorate. Since the content of the relatively reactive polyorganosiloxane decreases, the residual silane coupling agent remaining after the reaction with the polyorganosiloxane may react with the metal of the mold Reaction and adhesion, which makes molding and processing difficult. That is, when the silica filler is added in an excessive amount in order to improve the physical properties, the workability and moldability are lowered. Therefore, it is preferable that the silica filler does not deviate from the above range.

Silane coupling agent

The silane coupling agent is added in order to strengthen the bond strength between the inorganic material (silica) and the silicone rubber resin, and is preferably a vinyl silane coupling agent, an alkoxysilane coupling agent, an aminosilane coupling agent, an epoxy silane coupling agent, a methacryloxy silane coupling agent, An acryloxysilane coupling agent, a ureide silane coupling agent, a mercaptosilane coupling agent, and a combination thereof.

More specifically, there can be mentioned vinyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyl (Aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropyltriethoxysilane, triethoxysilane, , 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-ureidopropyltriethoxysilane, 3-chloropropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3- Isocyanate propyltriethoxysilane and the like can be used.

0.5 to 3 parts by weight of the silane coupling agent is added. If the amount is less than the above range, the effect is insignificant. When the amount is in excess of the above range, physical properties such as viscosity and tensile strength are lowered and voids may be generated. It is preferable that the range does not deviate.

Silicone oil

The silicone oil serves as a contained plasticizer to smooth the mixing of the polyorganosiloxane and the silica filler and ensure the resilience against compression deformation.

The silicone oil can be used without limitation as long as it is a silicone-based process oil having an OH group at the terminal group and organosilazane, but specifically includes, for example, methylhydroxysiloxane, vinylmethylhydroxysiloxane, hexamethyldisilazane , 1,4-divinyltetramethyldisilazane, dimethylsilicone oil, methylphenylsiloxane, diphenylsiloxane, and the like can be used.

The silicone oil is added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the polyorganosiloxane. If the amount of the silicone oil is less than the above range, the effect is insignificant. If it exceeds the above range, the properties of the silicone oil are lowered. desirable.

In this case, the viscosity of the silicone oil is preferably 3 to 700 cps at 25 캜 in consideration of volatility and processability.

Cross-linking agent

The crosslinking agent is an organic peroxide used as a crosslinking agent for the polyorganosiloxane. Examples thereof include 2,5-dimethyl-2,5-di- (tert-butylperoxy) -hexane, dicumyl peroxide, 1,1- 3,3,5-trimethylcyclohexane, Butyl 4,4-bis (tert-butyldioxy) valerate, Dibenzoyl peroxide, tert-Butyl peroxybenzoate, di- tert-butylperoxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyme-3.

The crosslinking agent may be added in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the polyorganosiloxane. When the amount of the crosslinking agent is less than the above range, the processing time is prolonged or the degree of crosslinking is decreased, It is difficult to control the degree of curing and the physical properties are deteriorated, so that it is preferable not to deviate from the above range.

inside Release agent

The internal release agent is added in order to allow the molded article to be easily released from the mold when the composition is molded. Examples of the internal release agent include fatty acid esters, metal soaps, polyethylene waxes, polypropylene waxes, natural waxes and acid waxes, Preferably, zinc stearate and calcium stearate may be used alone or in combination.

The releasing agent is contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the total composition. If the amount is less than the above range, the effect of the releasing agent is insignificant and the releasing from the mold is difficult. It is preferable that the above range is not exceeded because it interferes with the crosslinking of the silicone rubber.

Heat resistance enhancer

The composition according to the present invention may contain a heat resistance enhancer in order to improve heat stability, flame retardancy and heat resistance, and the heat resistance enhancer of the present invention may include a cerium compound.

As specific examples, the cerium compound may be cerium oxide, cerium carbonate, and cerium hydroxide, but is not limited thereto.

The cerium compound may be present in the form of a powder or a liquid in which the cerium compound is dispersed in a resin or a dispersion. The cerium compound powder has an average particle diameter of 1 to 500 nm, an average particle diameter of 10 to 500 m < / g. < / RTI >

In addition, the composition according to the present invention may contain any one or more of metal compounds such as iron, titanium, aluminum, magnesium, zirconium, nickel, dysprosium, terbium, holmium, erbium, ytterbium and compounds thereof as the heat resistance enhancer.

Also in the case of the metal compound, it is preferable that the metal compound has an average particle diameter of 1 to 500 nm and a specific surface area of 10 to 500 m < 2 > / g in order to improve dispersibility and heat resistance.

The cerium compound and the metal compound may be prepared by a sol-gel method or surface-treated with a surfactant to improve dispersibility and prevent re-aggregation.

As the surfactant, conventionally known surfactants may be used, but it is more preferable to use a silicone surfactant. It is also possible to use phosphoric acid and alkali metal salts or ammonium salts thereof as a surface treatment agent.

Vulcanizing accelerator

The composition according to the present invention may further comprise a vulcanization accelerator to accelerate vulcanization, and may be selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators, and mixtures thereof.

The inorganic vulcanization accelerator may be one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, titanium oxide, Can be used. The inorganic vulcanization accelerating aid has the effect of promoting vulcanization and improving heat resistance.

Examples of the organic-based vulcanization accelerator include stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof and mixtures thereof. You can use one.

The above-mentioned vulcanization accelerator aid is added in an amount of 1 to 5 parts by weight based on 100 parts by weight of the polyorganosiloxane. If the content is less than the above range, the effect is not expected. If the content exceeds the above range, Therefore, it is preferable not to deviate from the above content range because physical properties such as tensile strength may be lowered.

On the other hand, an inorganic vulcanization accelerator aid having an average particle size of 0.3 to 0.6 mu m is used. If the particle size is less than the above range, aggregation may occur and dispersibility may be lowered. If the particle size is exceeded, It is difficult to expect the increase in reactivity and the effect of accelerating the vulcanization, so that it is preferable not to deviate from the above range.

The waterproof seal molded article for automobile wiring harness according to the present invention is characterized in that the aforementioned waterproof seal silicone oil rubber composition for automobile wiring harness is heated at a temperature of 160 to 180 DEG C, at a pressure of 130 to 150 kgf / cm2, at a crosslinking time of 180 to 220 seconds, And then subjected to one or two cycles of extrusion vacuum molding.

Fig. 1 is an automobile connector wire seal formed body made of the composition of the present invention. Fig. 2 is an automobile connector inner seal formed body made of the composition of the present invention. Fig. 3 is an automobile connector dome-shaped molded body made of the composition of the present invention.

More specifically, the automotive connector wire seals have a top plate temperature of 165 to 175 占 폚, a pressure of 135 to 145 kgf / cm2 in a molding machine with a lower plate temperature of 170 占 폚 to 180 占 폚, a crosslinking time of 190 to 210 seconds, And the inner connector of the automobile connector is manufactured by press molding at a pressure of 135 to 145 kgf / cm 2, a crosslinking time of 190 to 210 seconds, a number of degassing times of 1 Or two times extrusion vacuum molding.

If the temperature and the pressure are less than the above range, uncomformed and non-uniform molding of the composition occurs. If the temperature and the pressure are exceeded, it is preferable that the temperature and the pressure range do not deviate from the above range.

Further, when the crosslinking time is less than the crosslinking time and bubbles are generated in the product, if the crosslinking time is exceeded, the product tears due to over-crosslinking, so that it is preferable not to deviate from the crosslinking time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Experimental material

SH 0130U (HTV rubber, KCC) and SH 9040U (Oil bleed, HTV rubber, KCC) were used as the silicone rubber (poly (methylvinylsiloxane) (PMVS)

As the crosslinking agent, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, product name LS-4 (Peroxide 50% powder with silica, Shin-Etsu) was used.

In case of LM-150, MIN-U-SIL 5 (USA) and LM-150 were attached to the mold after cross-linking. .

As the silicone oil, KF 54 (methylphenylsiloxane, kinematic viscosity 400 ㎡ / s, Shin-Etsu) and DC 550 (methylphenylsiloxane, kinematic viscosity 100 to 150 m 2 / s, Dow Corning) were used.

KBM-503 (3-methacryloxypropyltrimethoxysilane, shin-Etsu) and KBM-1003 (Vinyltrimethoxysilane, Shin Etsu) were prepared as silane coupling agents. KBM-1003 was attached to the mold after crosslinking to cause tearing The product was broken and the experiment was performed using KBM-503.

As the internal release agent, zinc stearate (Zn / st, KP-10) was used.

combination

The following Tables 1 and 2 show examples and comparative examples of the compounding ratio of the composition.

Table 1 shows the blending ratios of Comparative Examples 1 to 8 and Examples 1 to 4, and Table 2 shows the blending ratios of Comparative Examples 9 to 18.

The crosslinking conditions were T / P 180 ° C x 400 "and the second crosslinking was carried out at 200 ° C for 4 hours.

Test Items

Table 3 below shows quantitative target items.

Item unit Target value Remarks Hardness Shorea 40 ± 5 ASTM D412 The tensile strength kgf / cm2 70 or more ASTM D412 Elongation rate % 400 or more ASTM D412 Volume change rate % 60 or less ASTM D471 Compression Permanent String Ratio % 40 or less ASTM D395 Combustibility test mm / m Below 80 MS 300-8 Low temperature brittleness No crack No crack ASTM D2137 Cold tolerance test - Appearance should be fine ES91500-00 Humidity cycle test - Appearance should be fine ES91500-00 Confidentiality test kgf / cm2 0.5 or more ES91500-00

Physical property test

The hardness was measured with a Shore A type hardness meter according to ASTM D-412, and the average value was measured as hardness.

Tensile strength and elongation were measured with a tensile strength (TB) and elongation (EB) of ASTM D-412 using a die A cutter (thickness: 3 ± 0.1 mm) .

Volume change rate

The test specimens were prepared with a die A cutter according to ASTM D-471 and D-412, and measured for hardness, tensile strength, elongation and volume after 70 hours at 150 ° C after ASTM No.3 oil impregnation. After 5 repeated measurements, the mean value was taken.

Compression Permanent String Ratio

A specimen having a thickness of about 10 mm was prepared and measured according to ASTM D-395 at 175 ° C for 22 hours. At this time, the average value was taken after 5 repeated measurements.

combustibility

MS 300-08 (car interior lining combustibility test).

Prepare 5 samples of 300mm length, put the sample in the prescribed test tank, let the flame reach for 15 seconds, turn off immediately and confirm the combustion condition.

It was judged to have self-extinguishing ability (SE) when burning rate was 80 mm / min or less, flammability (O) when ignition did not occur even when flame was contacted for 15 seconds, ignition was ignited, combustion was 50 mm or less, .

Low temperature brittleness

The sample was immersed at -55 ° C for 3 minutes using methanol + dry ice as a refrigerant, and the shaft of the test piece mounted on the jig was rotated once to check the state of the test piece.

Confidentiality test

After airtightness test (-40 ℃ × 120 hrs) and 25 ℃ × relative humidity (65% RH) × 25 hrs after leaving the room, after 5 CYCLE proceeded as described in Table 4, after leaving for 2 hours at room temperature .

The sample was prepared by connecting six wires to the automobile connector. One of the six wires was left with one hole of the air inlet so that the air could be injected. , Acetic acid silane-OS, Shin-Etsu Silicone Co., Ltd.) was applied and sealed.

The airtightness test method is to place the combined connector (sample) in water and apply 10 kpa (0.1 kgf / ㎠) to the connector for 30 seconds according to the initial test angle (0 °, 30 °, 60 °) 0.1 kgf / cm < 2 >) to 200 kpa (2.0 kgf / cm < 2 >). The above evaluation method is also applied to one wire seal (air-permeable seal). However, the maximum value should be measured and specified in the evaluation report for reference (the internal input of the connector at the end of the wire of the sample should not be counted)

Tables 5 and 6 below show the results of the physical properties of the samples prepared at the blending ratios of Tables 1 and 2, respectively.

In the case of Comparative Examples 6 to 8, it was attached to the mold at the time of molding and was broken and the physical property test was impossible.

As a result, when the content of the polyorganosiloxane is constant, the relative reactivity of the polyorganosiloxane decreases as the content of the filler increases. Therefore, the residual silane coupling agent remaining after the reaction with the polyorganosiloxane reacts with the metal of the mold It was possible to deduce that the reaction and adhesion were difficult for molding and processing.

 That is, when the silica filler is excessively added in order to improve the physical properties, it is preferable to optimize the amount of the silica filler to be added because the workability and formability are lowered.

As shown in the results of the physical properties test, the silicone rubber compositions according to Examples 1 to 4 according to the present invention satisfied the quantitative target items and confirmed that they were suitable as waterproof connector seals for automobile wiring harnesses.

Particularly, Examples 1 to 4 have low hardness and excellent tensile strength and slippery property, so that it is possible to minimize tearing, brittle fracture and the like at the time of insertion process and external impact, and to have excellent waterproof property and airtightness .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken as limiting the scope of the present invention. The present invention can be variously modified or modified. The scope of the invention should, therefore, be construed in light of the claims set forth to cover many of such variations.

Claims (9)

A waterproof seal for automotive wiring harness, comprising:
Based on 100 parts by weight of the polyorganosiloxane, 10 to 30 parts by weight of a silica filler; 0.5 to 3 parts by weight of a silane coupling agent; 0.5 to 5 parts by weight of silicone oil; 0.1 to 3 parts by weight of a crosslinking agent; 0.1 to 3 parts by weight of an internal mold release agent; 1 to 5 parts by weight of inorganic and organic vulcanization accelerators,
The silica filler
A dry silica having a specific gravity of 2 to 3, a compressive density of 500 to 700 kg / m 3, a non-compressive density of 400 to 600 kg / m 3, an average particle size of 20 nm to 50 μm,
The internal mold release agent
Fatty acid esters, metal soaps, polyethylene waxes, polypropylene waxes, and combinations thereof.
The inorganic vulcanization accelerator aid
Characterized by having an average particle size of 0.3 to 0.6 mu m
Waterproof seal for automotive wiring harness. Silicone oil rubber composition.
delete The method according to claim 1,
The silane coupling agent
A vinyl silane coupling agent, an alkoxysilane coupling agent, an aminosilane coupling agent, an epoxy silane coupling agent, a methacryloxy silane coupling agent, an acryloxy silane coupling agent, a ureido silane coupling agent, a mercaptosilane coupling agent, and combinations thereof Is one of the groups
Waterproof seal for automotive wiring harness. Silicone oil rubber composition.
The method according to claim 1,
The silicone oil
Methylhydroxysiloxane, methylhydroxysiloxane, vinyl methylhydroxide siloxane, hexamethyldisilazane, 1,4-divinyltetramethyldisilazane, dimethylsilicone oil, methylphenylsiloxane, diphenylsiloxane, and combinations thereof. Characterized in that it is any one of
Waterproof seal for automotive wiring harness. Silicone oil rubber composition.
The method according to claim 1,
The cross-
2,5-Dimethyl-2,5-di- (tert-butylperoxy) -hexane, Dicumyl peroxide, 1,1-di- (tert-butylperoxy) -3,3,5-trimethylcyclohexane, Butyl 4,4-bis tert-butyldioxy) valerate, Dibenzoyl peroxide, tert-Butyl peroxybenzoate, di- (2-tert-butyl-peroxyisopropyl) -benzene, tert-butylcumylperoxide, tert-butylperoxy) hexyme-3.
Waterproof seal for automotive wiring harness. Silicone oil rubber composition.
delete delete delete A waterproof seal molded article for automobile wiring harness formed by using the waterproof seal silicone oil rubber composition for automobile wiring harness according to any one of claims 1 to 5,
And then subjected to extrusion vacuum molding at a temperature of 160 to 180 占 폚, a pressure of 130 to 150 kgf / cm2, a crosslinking time of 180 to 220 seconds, and a degassing time of 1 to 2 times.
Waterproof seal molding for car wiring harness.

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