阅读说明：本技术 一种绝缘电线电缆用复合薄膜及其制备方法 (Composite film for insulated wire and cable and preparation method thereof ) 是由 赵明哲 米春海 谢飞 李遥 于 2019-12-04 设计创作，主要内容包括：本发明公开了本发明提供一种绝缘电线电缆用复合薄膜,包括聚四氟乙烯薄膜层和聚酰亚胺薄膜层,其中,聚四氟乙烯薄膜层和聚酰亚胺薄膜层通过胶黏层部分交叠形成交叠层；其中,交叠层的宽度占聚四氟乙烯薄膜层宽度的比例为0.2-0.5；交叠层的宽度占聚酰亚胺薄膜层宽度的比例为0.3-0.5；其中,聚四氟乙烯薄膜的宽度与聚酰亚胺薄膜层宽度之比为1:0.9-1.2。本发明的绝缘电线电缆用复合薄膜,在不降低原来屏蔽性能的基础上,能够减少绕包环节,并降低电缆在弯折过程中的存在的绕包层滑脱的风险。(The invention discloses a composite film for an insulated wire and cable, which comprises a polytetrafluoroethylene film layer and a polyimide film layer, wherein the polytetrafluoroethylene film layer and the polyimide film layer are overlapped partially through an adhesive layer to form an overlapping layer; wherein the ratio of the width of the overlapping layer to the width of the polytetrafluoroethylene film layer is 0.2-0.5; the ratio of the width of the overlapping layer to the width of the polyimide film layer is 0.3-0.5; wherein the ratio of the width of the polytetrafluoroethylene film to the width of the polyimide film layer is 1: 0.9-1.2. The composite film for the insulated wire and cable can reduce the wrapping link and reduce the risk of slippage of the wrapping layer in the bending process of the cable on the basis of not reducing the original shielding performance.)

1. The composite film for the insulated wires and cables is characterized by comprising a polytetrafluoroethylene film layer and a polyimide film layer, wherein the polytetrafluoroethylene film layer and the polyimide film layer are overlapped partially through an adhesive layer to form an overlapping layer;

wherein the ratio of the width of the overlapping layer to the width of the polytetrafluoroethylene film layer is 0.2-0.5; the ratio of the width of the overlapping layer to the width of the polyimide film layer is 0.3-0.5;

wherein the ratio of the width of the polytetrafluoroethylene film to the width of the polyimide film layer is 1: 0.9-1.2.

2. The composite film for insulated wire and cable according to claim 1, wherein the polytetrafluoroethylene film layer is provided with protrusions on the lower surface thereof.

3. The composite film for insulated wire and cable according to claim 1, wherein the adhesive layer has a shear strength of not less than 2.5 MPa.

4. The composite film for insulated wire and cable according to claim 1, wherein the upper and/or lower surface of the polytetrafluoroethylene film layer is further plated with a silver metal layer.

5. The composite film for insulated wire and cable according to claim 1, wherein the polytetrafluoroethylene film layer is provided with through-holes.

6. A method for preparing a composite film for an insulated wire and cable according to any one of claims 1 to 5, comprising:

coating a layer of adhesive on the position, from the edge to 0.2-0.5 of the width ratio, of the polytetrafluoroethylene film along the length direction of the polytetrafluoroethylene film;

and pressing the imide film on the polytetrafluoroethylene film coated with the adhesive.

7. The method according to claim 6, wherein the adhesive is HT-1688 adhesive.

8. The preparation method of claim 6, further comprising vertically bombarding the surface of the polytetrafluoroethylene film with high-speed plasma airflow before applying the adhesive, so as to form micropores on the polytetrafluoroethylene film and form protrusions on the lower surface of the polytetrafluoroethylene film.

9. The method according to claim 6, further comprising the step of electroplating the polytetrafluoroethylene film in a silver plating bath before applying the adhesive.

10. The production method according to claim 9, wherein the silver plating bath further comprises at least an antioxidant, a fining agent and silver nitrate; wherein, relative to 10 weight parts of silver nitrate, the content of the antioxidant is 3-10 weight parts, and the content of the grain refining agent is 8-15 weight parts; the current density in the electroplating process is 15-30A/cm²(ii) a The temperature of the electroplating solution is 25-35 ℃ in the electroplating process, and the electroplating time is 20-30 min.

Technical Field

The invention relates to a film for a cable, in particular to a composite film for an insulated wire and a cable and a preparation method thereof.

Background

The wire has wide application in the aerospace field, but has more severe requirements on the weight of the wire, and has better attenuation characteristics and wider application temperature and other service performances on the premise of ensuring light weight. Conventional cables often fail to meet both of these requirements. The research of the aerospace light cable is devoted all the time, and the inventor finds that the microporous polytetrafluoroethylene film is adopted for wrapping, and the sheath is sleeved on the outer layer, so that the cable has the properties of light weight, small outer diameter, high use frequency, low loss, phase stability, high temperature resistance and the like. Moreover, in order to improve the insulating property, wrap a layer of polyimide film outside polytetrafluoroethylene film, however, the preparation technology of the cable is complicated and the preparation period is long due to the conventional continuous multilayer wrapping, and moreover, the cable has certain bending in the using process, so that the wrapping layer is easy to slip and insulation holes possibly exist.

Based on above-mentioned technical problem, if can provide a composite film for insulated wire cable, on the basis that does not reduce original shielding property, can reduce around the package link to reduce the risk of the cable in the existence of buckling around the slippage of covering, will have great contribution to the improvement of cable.

Disclosure of Invention

The invention aims to provide a composite film for an insulated wire and a cable and a preparation method thereof.

In order to achieve the purpose, the invention provides a composite film for an insulated wire and cable, which comprises a polytetrafluoroethylene film layer and a polyimide film layer, wherein the polytetrafluoroethylene film layer and the polyimide film layer are overlapped partially through an adhesive layer to form an overlapping layer; wherein the ratio of the width of the overlapping layer to the width of the polytetrafluoroethylene film layer is 0.2-0.5; the ratio of the width of the overlapping layer to the width of the polyimide film layer is 0.3-0.5; wherein the ratio of the width of the polytetrafluoroethylene film to the width of the polyimide film layer is 1: 0.9-1.2.

Preferably, the lower surface of the polytetrafluoroethylene film layer is provided with a protrusion.

Preferably, the adhesive layer has a shear strength of not less than 2.5 MPa.

Preferably, the upper and/or lower surface of the polytetrafluoroethylene film layer is further plated with a silver metal layer.

Preferably, the polytetrafluoroethylene film layer is provided with through micropores from top to bottom.

The invention also provides a preparation method of the composite film for the insulated wire and cable, which comprises the following steps: coating a layer of adhesive on the position, from the edge to 0.2-0.5 of the width ratio, of the polytetrafluoroethylene film along the length direction of the polytetrafluoroethylene film; and pressing the imide film on the polytetrafluoroethylene film coated with the adhesive.

Preferably, the adhesive is HT-1688 adhesive.

Preferably, before the adhesive is coated, the surface of the polytetrafluoroethylene film is vertically bombarded by high-speed plasma airflow, so that micropores are formed on the polytetrafluoroethylene film, and protrusions are formed on the lower surface of the polytetrafluoroethylene film.

Preferably, the method further comprises the step of electroplating the polytetrafluoroethylene film in a silver plating solution before the adhesive is coated.

Preferably, the silver plating solution at least comprises an antioxidant, a grain agent and silver nitrate; wherein, relative to 10 weight parts of silver nitrate, the content of the antioxidant is 3-10 weight parts, and the content of the grain refining agent is 8-15 weight parts; the current density in the electroplating process is 15-30A/cm²(ii) a The temperature of the electroplating solution is 25-35 ℃ in the electroplating process, and the electroplating time is 20-30 min.

Through the technical scheme, the invention provides a composite film for an insulated wire and cable, which comprises a polytetrafluoroethylene film layer and a polyimide film layer, wherein the polytetrafluoroethylene film layer and the polyimide film layer are overlapped partially through an adhesive layer to form an overlapping layer; wherein the ratio of the width of the overlapping layer to the width of the polytetrafluoroethylene film layer is 0.2-0.5; the ratio of the width of the overlapping layer to the width of the polyimide film layer is 0.3-0.5; wherein the ratio of the width of the polytetrafluoroethylene film to the width of the polyimide film layer is 1: 0.9-1.2. Like this, at the in-process of wrapping, can wrap the spiral of compound film for insulated wire and cable on other functional layers that inner conductor or inner conductor do, and take as an example on wrapping the inner conductor, wrap the wind round in the inner conductor with compound film spiral for insulated wire and cable earlier, like this, in the gained package, partly contains the stromatolite, and be close to and only have the polyimide thin layer around another part of package end, when the package of next round, the part that does not cover in the polytetrafluoroethylene thin layer has the polyimide thin layer just in time covers on only having the package of polyimide thin layer, like this, analogize in proper order, every layer of obtained package all has the overlap of polytetrafluoroethylene film and polyimide film. And at conventional preparation insulated wire and cable's in-process, generally wrap the packing in proper order with polytetrafluoroethylene film and obtain polytetrafluoroethylene film layer, then wrap the polyimide film at polytetrafluoroethylene film layer from the beginning again, need carry out the twice process of wrapping, the cable of so gained is not only the preparation process complicated, and what obtain moreover is easily caused the package slippage at the bending process of cable between the package, reduces shielding and insulating effect. Therefore, the composite film for the insulated wire and the cable can reduce the wrapping link and reduce the risk of slipping of the wrapping layer in the bending process of the cable on the basis of not reducing the original shielding performance.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a composite film for insulated wires and cables, which comprises a polytetrafluoroethylene film layer and a polyimide film layer, wherein the polytetrafluoroethylene film layer and the polyimide film layer are overlapped partially through an adhesive layer to form an overlapping layer; wherein the ratio of the width of the overlapping layer to the width of the polytetrafluoroethylene film layer is 0.2-0.5; the ratio of the width of the overlapping layer to the width of the polyimide film layer is 0.3-0.5; wherein the ratio of the width of the polytetrafluoroethylene film to the width of the polyimide film layer is 1: 0.9-1.2. Like this, at the in-process of wrapping, can wrap the spiral of compound film for insulated wire and cable on other functional layers that inner conductor or inner conductor do, and take as an example on wrapping the inner conductor, wrap the wind round in the inner conductor with compound film spiral for insulated wire and cable earlier, like this, in the gained package, partly contains the stromatolite, and be close to and only have the polyimide thin layer around another part of package end, when the package of next round, the part that does not cover in the polytetrafluoroethylene thin layer has the polyimide thin layer just in time covers on only having the package of polyimide thin layer, like this, analogize in proper order, every layer of obtained package all has the overlap of polytetrafluoroethylene film and polyimide film. And at conventional preparation insulated wire and cable's in-process, generally wrap the packing in proper order with polytetrafluoroethylene film and obtain polytetrafluoroethylene film layer, then wrap the polyimide film at polytetrafluoroethylene film layer from the beginning again, need carry out the twice process of wrapping, the cable of so gained is not only the preparation process complicated, and what obtain moreover is easily caused the package slippage at the bending process of cable between the package, reduces shielding and insulating effect. Therefore, the composite film for the insulated wire and the cable can reduce the wrapping link and reduce the risk of slipping of the wrapping layer in the bending process of the cable on the basis of not reducing the original shielding performance.

In a preferred embodiment of the present invention, the lower surface of the polytetrafluoroethylene film layer is provided with protrusions. Therefore, the slipping between the wrapping layers can be further prevented, and the shielding and insulating effects are improved.

In a preferred embodiment of the present invention, the adhesive layer has a shear strength of not less than 2.5 MPa. The adhesive effect of the polyimide film and the polytetrafluoroethylene film is improved, slipping is avoided, and the shielding and insulating effects are improved.

In a preferred embodiment of the present invention, the upper and/or lower surface of the teflon film layer is further plated with a silver metal layer. The shielding effect is further improved.

In a preferred embodiment of the present invention, the polytetrafluoroethylene film layer is provided with through-holes in the upper and lower portions.

The invention also provides a preparation method of the composite film for the insulated wire and cable, which comprises the following steps: coating a layer of adhesive on the position, with the ratio of the edge to the width of 0.2-0.5, of the polytetrafluoroethylene film along the length direction of the polytetrafluoroethylene film; and pressing the imide film on the polytetrafluoroethylene film coated with the adhesive. The composite film for the insulated wire and cable can reduce the wrapping link and reduce the risk of slippage of the wrapping layer in the bending process of the cable on the basis of not reducing the original shielding performance.

In a preferred embodiment of the invention, the adhesive is HT-1688 adhesive. The shear strength of the adhesive is greater than 2.5MPa, so that slipping between the wrapping layers is prevented, and the shielding and insulating effects are improved.

Preparation example

Coating a layer of adhesive on the position, from the edge to 0.2-0.5 of the width ratio, of the polytetrafluoroethylene film along the length direction of the polytetrafluoroethylene film; and pressing the imide film on the polytetrafluoroethylene film coated with the adhesive to obtain the composite film for the insulated wire and cable.

In one embodiment of the present invention, 19 silver-plated round copper wires were twisted to prepare an inner conductor; two layers of the composite film for the insulated wire and cable are wrapped outside the inner conductor, and the wrapping and covering surface is not less than the width of the single-side polyimide film to form an isolation layer; wrapping a silver-plated flat copper strip outside the isolation layer, and weaving a silver-plated flat copper strip to form an outer conductor layer, wherein the thickness of a silver layer in the silver-plated copper strip is 2.0 mu m, and the thickness and width of the silver-plated copper strip are 0.05mm and 0.05mm respectively; wrapping a water-blocking tape outside the outer conductor layer to form a water-blocking layer, wherein the water-blocking layer has the water immersion expansion speed of not less than 14 mm/min; and (5) sleeving a sheath outside the water-resistant layer 6 to obtain the final phase-stable cable. The cable can transmit power up to 2000W (1GHz), which is much higher than 500W (1GHz) of the common phase-stable cable, and the loss of the cable provided by the embodiment is less than 1.7% before and after high-speed vibration and bending; in the aspect of mechanical phase stabilization, the phase angle change of the cable under the bending mechanical condition is within 2.2 degrees, which is superior to 5 degrees of the conventional cable; in the aspect of standing wave performance, namely signal distortion, the standing wave value of a frequency band below 40GHz is less than or equal to 1.03, and the value does not exceed 1.11 even after high-speed vibration bending change, so that the signal transmission characteristic is effectively ensured.

And the comparative example is set according to the following mode, two layers of polytetrafluoroethylene films and polyimide films are alternately wound and wrapped outside the inner conductor, the overlapping rate of each layer is not less than 0.5, and the insulating layer is formed by replacing the mode that two layers of composite films for the insulated wire and cable are wound and wrapped outside the inner conductor, and the winding overlapping surface is not less than the width of the polyimide film on one side. The cable can transmit power up to 2000W (1GHz), which is much higher than 500W (1GHz) of the common phase-stable cable, and the loss of the cable provided by the embodiment is less than 1.8% before and after high-speed vibration and bending; in the aspect of mechanical phase stabilization, the phase angle change of the cable under the bending mechanical condition is within 2.4 degrees, which is superior to 5 degrees of the conventional cable; the standing wave performance, namely the signal distortion, is less than or equal to 1.06 in the frequency band below 40GHz, and the value does not exceed 1.14 even after the high-speed vibration bending change.

Therefore, the composite film for the insulated wire and cable can reduce the wrapping link and reduce the risk of slippage of the wrapping layer in the bending process of the cable on the basis of not reducing the original shielding performance.

In a preferred embodiment of the invention, before the adhesive is coated, the surface of the polytetrafluoroethylene film is vertically bombarded by high-speed plasma airflow, so that micropores are formed on the polytetrafluoroethylene film and protrusions are formed on the lower surface of the polytetrafluoroethylene film.

In a preferred embodiment of the present invention, the method further comprises the step of electroplating the polytetrafluoroethylene film in a silver plating solution before the step of coating the adhesive.

In a preferred embodiment of the present invention, the silver plating bath further comprises at least an antioxidant, a fining agent and silver nitrate; wherein, relative to 10 weight parts of silver nitrate, the content of the antioxidant is 3-10 weight parts, and the content of the grain refining agent is 8-15 weight parts; the current density in the electroplating process is 15-30A/cm²(ii) a The temperature of the electroplating solution is 25-35 ℃ in the electroplating process, and the electroplating time is 20-30 min.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.