阅读说明：本技术 一种射频电缆及其制备工艺 (Radio frequency cable and preparation process thereof ) 是由 范建川 黄成� 廖静 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种射频电缆包括内导体层、绝缘层、屏蔽保护层；所述的屏蔽保护层通过注塑成型方式完全包裹绝缘层；所述绝缘层通过注塑成型方式完全包裹内导体层；本发明还提供一种射频电缆的制备工艺,包括以下步骤：S1绝缘体层制备；S2屏蔽保护层制备；S3射频电缆成品制备；本发明的有益效果是：采用屏蔽保护层,既能保护又能起到屏蔽作用,在抗挤压、耐磨方面更具优越性；采用环氧树脂作为绝缘层和外壳层原料,屏蔽保护层与绝缘层粘接更充分,同时作为外壳层原料时,使射频电缆整体成型；采用乳酸菌发酵液作为冷却剂,防止冷却使屏蔽保护层外表面损坏；乳酸蒸汽起到杀菌作用,冷乳酸还可消除屏蔽保护层的外表面的杂质。(The invention discloses a radio frequency cable which comprises an inner conductor layer, an insulating layer and a shielding protective layer; the shielding protective layer completely wraps the insulating layer in an injection molding mode; the insulating layer completely wraps the inner conductor layer in an injection molding mode; the invention also provides a preparation process of the radio frequency cable, which comprises the following steps: s1 preparing an insulator layer; s2 preparing a shielding protective layer; s3 preparing a finished product of the radio frequency cable; the invention has the beneficial effects that: the shielding protective layer is adopted, so that the protective layer can protect and play a shielding role, and has more superiority in the aspects of extrusion resistance and wear resistance; the epoxy resin is used as raw materials of the insulating layer and the shell layer, the shielding protective layer is more fully bonded with the insulating layer, and meanwhile, when the epoxy resin is used as a raw material of the shell layer, the radio frequency cable is integrally molded; lactic acid bacteria fermentation liquor is used as a cooling agent to prevent the outer surface of the shielding protective layer from being damaged due to cooling; the lactic acid vapor has the sterilization effect, and the cold lactic acid can also eliminate impurities on the outer surface of the shielding protective layer.)

1. A radio frequency cable, characterized by: comprises an inner conductor layer, an insulating layer and a shielding protective layer; the shielding protective layer completely wraps the insulating layer in an injection molding mode; the insulating layer completely wraps the inner conductor layer in an injection molding mode; the shielding protective layer comprises the following raw materials in parts by weight: 50-70 parts of rice husks, 5-10 parts of graphene powder, 20-25 parts of epoxy resin and 5-10 parts of lactobacillus fermentation liquor; the insulating layer is composed of epoxy resin.

2. A radio frequency cable according to claim 1, wherein: the shielding protective layer is prepared by the following steps:

s1, carbonizing the chaff through high-temperature reaction, placing the carbonized fiber net in an environment of 600-700 ℃, uniformly pouring mixed hot melt of magnesium aluminum alloy and tin wires on the fiber net, fully soaking the fiber net in the epoxy resin hot melt, and taking out the fiber net to obtain a shielding protective layer fiber net;

s2, placing the shielding protection layer fiber web into the graphene powder while the shielding protection layer fiber web is hot, blowing the graphene powder to enable the graphene powder to uniformly cover the shielding protection layer fiber web, and forming a rough graphene shielding protection layer;

s3, heating the rough graphene shielding protection layer again to enable the rough graphene shielding protection layer to be in a hot melting state, stirring uniformly and mixing to obtain a shielding protection layer hot melt, and cooling by using lactobacillus fermentation liquor to obtain the shielding protection layer.

3. A process for preparing a radio frequency cable according to claim 2, wherein: and in the step S3, the stirring and mixing are performed according to the transparent state of the shielding protective layer hot melt, and the epoxy resin hot melt is added in the stirring stage to accelerate the transparent state of the shielding protective layer hot melt.

4. A radio frequency cable according to claim 1, wherein: the inner conductor layer is composed of 7 groups of 0.1mm silver-plated copper stranded wires.

5. The process for preparing a radio frequency cable according to claim 1, wherein: the epoxy resin is bisphenol A epoxy resin.

6. A preparation process of a radio frequency cable is characterized by comprising the following steps: the method comprises the following steps:

s1, firstly, utilizing epoxy resin hot melt to perform injection molding and bonding to the inner conductor layer to obtain an insulating layer;

s2, completely wrapping the shielding protection layer hot melt with an insulating layer through an injection molding process, and cooling the shielding protection layer hot melt by using lactobacillus fermentation liquor to obtain a rough radio frequency cable;

s3, the rough radio frequency cable is pulled and kneaded, and meanwhile, the lactobacillus fermentation liquor is used for washing the surface of the radio frequency cable, so that a finished product of the radio frequency cable is obtained.

7. The process of claim 6, wherein the process comprises the steps of: the injection molding process comprises the following steps:

a. firstly, heating and performing thermoplastic extrusion on the surface of an inner conductor layer by using an epoxy resin hot-melt liquid with the temperature of 400-plus-500 ℃ to form an insulating layer in a hot-melt state, then cooling the hot-melt liquid of the shielding protective layer to the temperature of 400-plus-500 ℃ by using a lactobacillus fermentation liquid, uniformly covering the surface of the insulating layer by using a thermoplastic extrusion mode, and performing cooling molding on the lactobacillus fermentation liquid to obtain a I-grade shielding protective layer;

b. performing thermoplastic extrusion on the I-grade shielding protective layer by using 400-plus-500-DEG C epoxy resin hot melt liquid, and performing cooling molding on the lactic acid bacteria fermentation liquor to obtain a II-grade shielding protective layer;

c. and brushing the II-grade shielding protective layer by using the epoxy resin hot melting liquid with the temperature of 400-.

8. The process of claim 6, wherein the process comprises the steps of: the lifting adopts an annular lifting mode, the surface of the cable is uniform, and the uneven part is uniformly coated with 400-plus-500 ℃ epoxy resin hot melting liquid.

9. The process of claim 6, wherein the process comprises the steps of: the kneading adopts leather kneading, animal grease is added in the kneading stage, and the standard is that the cable surface is bright and uniform.

Technical Field

The invention relates to the field of cable preparation, in particular to a radio frequency cable and a preparation process thereof.

Background

The radio frequency cable, also called coaxial cable, is composed of an inner conductor, an outer conductor and a medium for supporting the inner conductor and the outer conductor which are coaxial with each other, and is an important device in radio frequency transmission of radio communication and broadcast television, and the characteristics of the radio frequency cable include electrical apparatus performance and mechanical performance: the electrical performance comprises characteristic impedance, transmission loss and frequency characteristics thereof, temperature characteristics, shielding characteristics, rated power, maximum pressure-resistant mechanical performance comprising minimum bending radius, weight per unit length, allowable maximum tensile force and aging characteristics and consistency of the cable, wherein the shielding performance and the maximum pressure-resistant mechanical performance (wear resistance) are important indexes for judging the qualification of the radio frequency cable.

Most of the existing radio frequency cables adopt the form of an inner conductor layer, an insulating layer, a shielding layer (metal mesh) and a protective sleeve, in the production process of the radio frequency cables, an inner conductor is firstly extruded with a layer of insulating layer FEP, then the production process enters a weaving stage, the efficiency of the weaving process is very slow, the production speed of products is seriously influenced, and after the weaving is finished, the production process of the radio frequency cables is finished by entering the extrusion process of an outer sheath; for example, the invention provides a coaxial cable manufacturing process (application number: 2009100333047) which solves the technical problems of poor performance, unreasonable structural design, high manufacturing cost and the like in the prior art; the coaxial cable comprises an inner conductor made of a conductive material, and an insulating layer is coated on the inner conductor. The manufacturing process comprises the following steps: A. preheating an inner conductor, B, coating an insulating layer, C, coating a shielding layer; although the polyether-ether-ketone injection-molded insulating layer is adopted, the traditional metal woven mesh is also adopted as a shielding layer, the time consumption is long, the shielding performance of the metal woven mesh is limited, and the amount of shielded electromagnetic waves is limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a radio frequency cable and a preparation process thereof so as to at least achieve the aims of integrated molding of a shielding layer and a protective layer, excellent shielding performance and short preparation time

The purpose of the invention is realized by the following technical scheme:

a radio frequency cable comprises an inner conductor layer, an insulating layer and a shielding protective layer; the shielding protective layer completely wraps the insulating layer in an injection molding mode; the insulating layer completely wraps the inner conductor layer in an injection molding mode; the shielding protective layer comprises the following raw materials in parts by weight: 50-70 parts of chaff; 5-10 parts of graphene powder; 20-25 parts of epoxy resin; 5-10 parts of lactobacillus fermentation liquor; the insulating layer is composed of epoxy resin.

Preferably, in order to obtain a complete shielding protective layer, the shielding protective layer is prepared by the following steps:

s1, carbonizing the chaff through high-temperature reaction, placing the carbonized fiber net in an environment of 600-700 ℃, uniformly pouring mixed hot melt of magnesium aluminum alloy and tin wires on the fiber net, fully soaking the fiber net in the epoxy resin hot melt, and taking out the fiber net to obtain a shielding protective layer fiber net;

s2, placing the shielding protection layer fiber web into the graphene powder while the shielding protection layer fiber web is hot, blowing the graphene powder to enable the graphene powder to uniformly cover the shielding protection layer fiber web, and forming a rough graphene shielding protection layer;

s3, heating the rough graphene shielding protection layer again to enable the rough graphene shielding protection layer to be in a hot melting state, stirring uniformly and mixing to obtain a shielding protection layer hot melt, and cooling by using lactobacillus fermentation liquor to obtain the shielding protection layer.

Preferably, in order to further make the shielding protection layer hot melt uniform, the stirring and mixing in S3 is based on the transparent brightness of the shielding protection layer hot melt, and the epoxy resin hot melt can be added in the stirring stage to accelerate the transparent brightness of the shielding protection layer hot melt, so that the epoxy resin is added in the stirring and mixing stage, thereby preventing the occurrence of particle impurities in the epoxy resin hot melt and further influencing the quality of the subsequent shielding protection layer, and simultaneously making the shielding protection layer hot melt transparent and uniform, and facilitating the subsequent injection molding process.

Preferably, in order to make the application objects of the prepared radio frequency cable wider, the inner conductor layer is composed of 7 groups of 0.1mm silver-plated copper stranded wires, and the specific material of the inner conductor layer is limited, so that the radio frequency cable preparation process provided by the invention has higher practicability.

Preferably, in order to make the material of the insulating layer more economical and easily available, the epoxy resin is bisphenol a type epoxy resin, and the common epoxy resin type is adopted as the main material of the insulating layer and the shielding protective layer, so that the application range of the invention is wider.

The invention also provides a preparation process of the radio frequency cable, which comprises the following steps:

s1, firstly, utilizing epoxy resin hot melt to perform injection molding and bonding to the inner conductor layer to obtain an insulating layer;

s2, completely wrapping the insulation layer on the shielding protection layer hot melt through an injection molding process, cooling the shielding protection layer hot melt by using the lactobacillus fermentation liquor to obtain a rough radio frequency cable, and carbonizing protein substances in the fermentation liquor while cooling by using the lactobacillus fermentation liquor as a coolant to prevent the outer surface of the shielding protection layer from being damaged by cooling; meanwhile, lactic acid steam in the lactic acid bacteria plays a role in sterilization, and the cooled lactic acid in the fermentation liquor can also eliminate uneven impurities on the outer surface of the shielding protective layer;

s3, the rough radio frequency cable is pulled and kneaded, and meanwhile, the lactobacillus fermentation liquor is used for washing the surface of the radio frequency cable, so that a finished product of the radio frequency cable is obtained.

Preferably, in order to uniformly cover the surface of the insulating layer with the shielding protective layer, the injection molding process comprises the following steps:

a. firstly, performing thermoplastic extrusion on the surface of an inner conductor layer by using an epoxy resin hot-melt liquid with the temperature of 400-plus-500 ℃ to form an insulating layer in a hot-melt state, then cooling the hot-melt liquid of the shielding protective layer to the temperature of 400-plus-500 ℃ by using a lactobacillus fermentation liquid, uniformly covering the surface of the insulating layer by using a thermoplastic extrusion mode, and performing cooling molding on the lactobacillus fermentation liquid to obtain a I-grade shielding protective layer;

b. performing thermoplastic extrusion on the I-grade shielding protective layer by using 400-plus-500-DEG C epoxy resin hot melt liquid, and performing cooling molding on the lactic acid bacteria fermentation liquor to obtain a II-grade shielding protective layer;

c. washing the II-level shielding protective layer by using the epoxy resin hot melting liquid with the temperature of 400-; meanwhile, the epoxy resin is used as a shell layer of the shielding protective layer, so that the outer surface of the shielding protective layer is smooth, and the friction resistance is improved.

Preferably, in order to make the rough shielding protection layer more uniform, the pulling adopts an annular pulling mode, and the uneven part is uniformly coated with 400-500 ℃ epoxy resin hot melt liquid based on the uniformity of the cable surface, so that the cable surface is smoother, and the abrasion resistance is further improved.

Preferably, in order to make the rough shielding protective layer more uniform, leather is adopted for kneading, and animal fat is added in the kneading stage, which takes the brightness and uniformity of the cable surface as the standard.

Preferably, in order to further make the shielding protection layer hot melt uniform, the stirring and mixing in S3 is based on the transparent brightness of the shielding protection layer hot melt, and the epoxy resin hot melt can be added in the stirring stage to accelerate the transparent brightness of the shielding protection layer hot melt, so that the epoxy resin is added in the stirring and mixing stage, thereby preventing the occurrence of particle impurities in the epoxy resin hot melt and further influencing the quality of the subsequent shielding protection layer, and simultaneously making the shielding protection layer hot melt transparent and uniform, and facilitating the subsequent injection molding process.

Preferably, in order to further determine the shielding performance of the finished radio frequency cable, the shielding performance of the finished radio frequency cable is determined according to the shielding data of the finished radio frequency cable at the frequency of 30-1500 mhz, the electromagnetic frequency of the test is limited, the finished radio frequency cable is enabled to determine the shielding performance in a large range, and the superiority of the shielding performance of the finished radio frequency cable is fully explained.

Preferably, in order to verify the wear resistance of the finished radio frequency cable under the extreme condition, the wear resistance data is the complete damage time of the skin under the action of 2000N pressure generated by a friction wheel at 2000r/min, and the wear resistance of the finished radio frequency cable under the extreme condition is verified by adopting the wear resistance characteristic of the finished radio frequency cable under the condition of large pressure, so that the superiority of the finished radio frequency cable is reflected.

The invention has the beneficial effects that:

1. the shielding protective layer is formed by adopting a carbonized fiber net, an aluminum-magnesium alloy, a tin wire hot melt liquid and an epoxy resin hot melt liquid, the traditional shielding layer and a protective outer sleeve are distinguished, the shielding protective layer and the protective outer sleeve are integrally formed by adopting an injection molding process, the shielding protective layer can be protected and can play a shielding role, and meanwhile, the radio frequency cable subjected to injection molding is a totally-enclosed cable, so that the radio frequency cable has more superiority in the aspects of extrusion resistance and wear resistance.

2. Adopt epoxy as insulating layer and shell layer raw materials, shielding protective layer and insulating layer bonding are more abundant, and when the shell layer raw materials of conduct simultaneously, can fuse as an organic whole with shielding protective layer heat, and then make the whole shaping of radio frequency cable.

3. The lactobacillus fermentation liquor is used as a cooling agent, and protein substances in the fermentation liquor are carbonized while being cooled to wrap the outside of the shielding protective layer, so that the outer surface of the shielding protective layer is prevented from being damaged by cooling; meanwhile, lactic acid steam in the lactic acid bacteria plays a role in sterilization, and the lactic acid can also eliminate impurities on the outer surface of the shielding protective layer in the cooled fermentation liquor.

Drawings

FIG. 1 is a schematic view of a radio frequency cable;

FIG. 2 is a table of shield and abrasion data statistics for finished radio frequency cables;

in the figure, 1-inner conductor layer, 2-insulating layer, 3-shielding protection layer, 4-envelope layer.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.