High-temperature sealing adhesive conductor and application thereof in automobile wire harness
Technical Field
The invention relates to the technical field of wires and cables, in particular to a high-temperature sealing glue conductor and application thereof in an automobile wire harness.
Background
In the existing cable, the full sealing can not be realized among all monofilaments of the stranded conductor and between the conductor and the insulating layer, and gaps are inevitably formed. As a common cable, the usage environment of the automotive wiring harness is mostly a greasy and high-temperature environment, and the automotive wiring harness often needs to bear a certain negative pressure. Under such severe conditions, oil in the oil tank may flow into the cylinder through a gap inside the electric wire, thereby affecting normal use of the engine. Therefore, the common cable cannot meet the requirement of the automobile wire harness, and the automobile wire harness with high temperature resistance and good sealing performance needs to be provided urgently.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-temperature sealing glue conductor which can resist the temperature of 150-200 ℃, the interior of the conductor and the space between the conductor and the insulation are kept sealed, and the phenomenon of oil leakage is not generated under the negative pressure of 100 Hg; the filling sealing material in the electric wire has conductivity, and the original conductivity of the conductor is not influenced; and the conductor is resistant to various fuel oils and chemical solvents.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a high-temperature sealing glue conductor which comprises a stranded conductor, wherein an insulating layer is arranged on the outer side of the stranded conductor, and a sheath layer is arranged on the outer side of the insulating layer; the high-temperature sealing adhesive is filled in a gap between the stranded conductor and the insulating layer, and comprises the following components in parts by weight: 80-120 parts of silicon resin, 5-20 parts of vulcanizing agent, 20-30 parts of conductive graphene carbon tubes, 5-15 parts of nano metal powder, 70-120 parts of high-temperature glue and 2-10 parts of coupling agent.
According to the invention, the high-temperature sealant is added into the conventional cable, has good sealing property, is filled among the single wires of the stranded conductor and between the conductor and the insulating layer, realizes the totally-enclosed internal space of the conductor, avoids the oil in the oil tank from flowing into the cylinder through the gap inside the wire, and ensures the normal use of the engine. In addition, the high-temperature sealant also has conductivity, and the original conductivity of the stranded conductor cannot be influenced.
Further, the stranded conductor is formed by stranding a plurality of strands, each strand comprises one or more monofilaments, and each monofilament is a tin-plated monofilament, a silver-plated monofilament or a nickel-plated monofilament. By selecting the single wires as the tin-plated single wires, the silver-plated single wires or the nickel-plated single wires, the temperature resistance of 200 ℃ can be realized, the corrosion resistance of the conductor is improved, and various fuel oil and chemical substances can be resisted. Preferably, the monofilaments are tinned monofilaments.
Further, the insulating layer is a silicon rubber insulating layer or a crosslinked polyethylene insulating layer.
Further, the silicone resin is liquid silicone.
Further, the vulcanizing agent is dicumyl peroxide, 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, 2, 4-dichlorobenzoyl peroxide, di-t-butyl peroxide, 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane), di (t-butylperoxyisopropyl) benzene, or 1, 1-bis (t-butylperoxy) -3,3, 5-trimethylcyclohexane.
Further, the conductive graphene carbon tube has a diameter of 5 to 50nm and a length of 0.5 to 10 μm.
Further, the thickness of the insulating layer is 1-3 mm.
Further, the nano metal powder is selected from one or more of metal copper powder, metal aluminum powder and metal nickel powder, and the particle size of the nano metal powder is 20-100 nm.
Further, the high-temperature adhesive is composed of epoxy resin, epoxy modified acrylic resin and a curing agent, the mass ratio of the epoxy resin to the epoxy modified acrylic resin is 1-2: 1-2, and the content of the curing agent is 10-20 wt% of the total amount of the resin.
Further, the coupling agent is a silane coupling agent or a titanate coupling agent.
Further, the curing agent is a thermal curing agent, including but not limited to isocyanate curing agents and epoxy curing agents.
Further, the high-temperature sealant comprises the following components in parts by weight: 100 parts of silicon resin, 12 parts of vulcanizing agent, 24 parts of conductive graphene carbon tubes, 10 parts of nano metal powder, 100 parts of high-temperature glue and 8 parts of coupling agent.
The high-temperature sealing glue conductor can be prepared by the following preparation method:
adding a conductive graphene carbon tube, nano metal powder and a coupling agent into a mixer, and mixing at the rotating speed of 300-600 rpm for 30-60 min;
respectively adding silicone resin, a vulcanizing agent and high-temperature glue into the mixer, and mixing at the rotating speed of 300-600 rpm for 30-60 min to obtain a high-temperature sealant coating solution;
providing a stranded conductor, enabling the stranded conductor to pass through high-temperature sealant coating liquid, coating the high-temperature sealant, coating an insulating layer on the outer side of the stranded conductor, and then carrying out vulcanization treatment; after vulcanization, a sheath layer is arranged outside the insulating layer, and the high-temperature sealing glue conductor is obtained.
In the invention, the temperature of the vulcanization treatment is 100-150 ℃, and the time of the vulcanization treatment is 20-60 min. In the process of vulcanization treatment, the high-temperature glue simultaneously carries out curing reaction to firmly bond the conductor monofilament and the insulating layer together.
The invention also provides application of the high-temperature sealing adhesive conductor in an automobile wire harness.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the high-temperature sealing glue conductor, the high-temperature sealing glue is added into a conventional cable, has good sealing performance, is filled among the single wires of the stranded conductor and between the conductor and the insulating layer, realizes the totally-closed internal space of the conductor, avoids oil in an oil tank from flowing into the cylinder through the gap inside the wire, and ensures the normal use of an engine.
2. The high-temperature sealant disclosed by the invention comprises silicon resin, a vulcanizing agent, a conductive graphene carbon tube, nano metal powder, high-temperature glue and a coupling agent, wherein the sealant has good conductivity by adding the conductive graphene carbon tube and the nano metal powder, so that the original conductivity of a conductor cannot be influenced when the sealant is filled among monofilaments of a stranded conductor and between the conductor and an insulating layer; the high-temperature adhesive consists of epoxy resin and epoxy modified acrylic resin with good temperature resistance, so that the bonding performance of the high-temperature adhesive in a high-temperature environment is improved; in addition, by adding the silicone resin and the vulcanizing agent, the mechanical property, the elasticity, the aging resistance and the sealing property of the high-temperature sealant are greatly improved after vulcanization.
Drawings
FIG. 1 is a schematic cross-sectional view of a high temperature molding compound conductor in accordance with embodiment 1 of the present invention;
wherein: 1. a strand; 2. high-temperature sealant; 3. an insulating layer; 4. a sheath layer.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.
Example 1
As shown in fig. 1, the embodiment provides a high-temperature sealing compound conductor, which includes a stranded conductor, an insulating layer 3 is disposed outside the stranded conductor, and a sheath layer 4 is disposed outside the insulating layer 3. The cross-sectional area of the stranded conductor is 10mm2The yarn is formed by twisting 16 strands 1, each strand 1 comprises 20 tinned monofilaments, and the diameter of each monofilament is 0.180 mm. The insulating layer 3 is an XLPO insulating layer with a thickness of 1 mm. The sheath layer 4 is a silicon rubber sheath layer with the thickness of 3 mm.
The high-temperature sealant 2 is filled in a gap between the stranded conductor and the insulating layer, and the high-temperature sealant 2 comprises the following components in parts by weight:
wherein the conductive graphene carbon tube has a diameter of 10-20 nm, a length of 5-10 μm, and a particle size of 20-30 nm.
The preparation method of the high-temperature sealing adhesive conductor of the embodiment comprises the following steps: adding the conductive graphene carbon tubes, the nano aluminum powder and the silane coupling agent into a mixer, and mixing at the rotating speed of 500rpm for 60 min; and then respectively adding liquid silica gel, dicumyl peroxide, epoxy resin, epoxy modified acrylic resin and isocyanate curing agent into the mixer, and mixing at the rotating speed of 500rpm for 60min to obtain the high-temperature sealant coating liquid. And finally, the stranded conductor penetrates through the high-temperature sealant coating liquid, the high-temperature sealant is coated, an insulating layer is coated on the outer side of the stranded conductor, and then vulcanization treatment is carried out, wherein the vulcanization treatment temperature is 120 ℃, and the vulcanization treatment time is 60 min. After the vulcanization treatment, a sheath layer is arranged outside the insulating layer, and the high-temperature sealing compound conductor of the embodiment is obtained.
Example 2
The embodiment provides a high temperature seals and glues conductor, including the stranded conductor, the stranded conductor outside is provided with the insulating layer, the insulating layer outside is provided with the restrictive coating. The cross-sectional area of the stranded conductor is 10mm2The yarn is formed by twisting 16 strands, each strand comprises 20 tinned monofilaments, and the diameter of the filament is 0.180 mm. The insulating layer is a silicon rubber insulating layer with the thickness of 1 mm. The restrictive coating is the silicon rubber restrictive coating, and thickness is 3 mm.
And a gap between the stranded conductor and the insulating layer is filled with a high-temperature sealant, and the high-temperature sealant comprises the following components in parts by weight:
wherein the diameter of the conductive graphene carbon tube is 10-20 nm, the length is 5-10 μm, and the particle size of the metallic nickel powder is 30-50 nm.
The preparation method of the high-temperature sealing adhesive conductor of the embodiment comprises the following steps: adding the conductive graphene carbon tube, the nano nickel powder and the silane coupling agent into a mixer, and mixing at the rotating speed of 500rpm for 60 min; and then respectively adding liquid silica gel, dicumyl peroxide, epoxy resin, epoxy modified acrylic resin and epoxy curing agent into the mixer, and mixing at the rotating speed of 500rpm for 60min to obtain the high-temperature sealant. And finally, the stranded conductor penetrates through the high-temperature sealant coating liquid, the high-temperature sealant is coated, an insulating layer is coated on the outer side of the stranded conductor, and then vulcanization treatment is carried out, wherein the vulcanization treatment temperature is 120 ℃, and the vulcanization treatment time is 60 min. After the vulcanization treatment, a sheath layer is arranged outside the insulating layer, and the high-temperature sealing compound conductor of the embodiment is obtained.
Example 3
The embodiment provides a high temperature seals and glues conductor, including the stranded conductor, the stranded conductor outside is provided with the insulating layer, the insulating layer outside is provided with the restrictive coating. The cross-sectional area of the stranded conductor is 10mm2The yarn is formed by twisting 16 strands, each strand comprises 20 tinned monofilaments, and the diameter of the filament is 0.180 mm. The insulating layer is XLPO insulating layer, and the thickness is 2 mm. The restrictive coating is the silicon rubber restrictive coating, and thickness is 3 mm.
And a gap between the stranded conductor and the insulating layer is filled with a high-temperature sealant, and the high-temperature sealant comprises the following components in parts by weight:
wherein the diameter of the conductive graphene carbon tube is 10-20 nm, the length is 5-10 μm, and the particle size of the metal copper powder is 30-50 nm.
The preparation method of the high-temperature sealing adhesive conductor of the embodiment comprises the following steps: adding the conductive graphene carbon tubes, the nano copper powder and the silane coupling agent into a mixer, and mixing at the rotating speed of 500rpm for 60 min; and then respectively adding liquid silica gel, dicumyl peroxide, epoxy resin, epoxy modified acrylic resin and epoxy curing agent into the mixer, and mixing at the rotating speed of 500rpm for 60min to obtain the high-temperature sealant. And finally, the stranded conductor penetrates through the high-temperature sealant coating liquid, the high-temperature sealant is coated, an insulating layer is coated on the outer side of the stranded conductor, and then vulcanization treatment is carried out, wherein the vulcanization treatment temperature is 120 ℃, and the vulcanization treatment time is 60 min. After the vulcanization treatment, a sheath layer is arranged outside the insulating layer, and the high-temperature sealing compound conductor of the embodiment is obtained.
Tests show that the high-temperature sealing glue conductors of the embodiments 1 to 3 have the temperature resistance of 200 ℃, good aging resistance, sealing performance and oil resistance, and can be used as automobile wire harnesses.
In conclusion, the high-temperature sealing glue conductor provided by the invention can resist the temperature of 150-200 ℃, the interior of the conductor and the insulation are sealed, and the oil leakage phenomenon is not generated under the negative pressure of 100 Hg; the filling sealing material in the electric wire has conductivity, and the original conductivity of the conductor is not influenced; and the conductor is resistant to various fuel oils and chemical solvents. The high-temperature sealing glue conductor can be applied to automobile wire harnesses and has wide application prospect.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.