CN101540216A - 150 DEG C irradiation cross-linked computer cable and method for manufacturing same - Google Patents

Abstract

The invention relates to a cross-linked computer cable and a manufacturing method thereof, and the computer cable can work in an environment of 150°C. Its structure includes outer sheath, first shielding layer, first tape layer, filling and inner covering wire, inner covering wire includes second shielding layer, second covering layer, conductor and insulating layer; the insulating layer is irradiated at 150℃ Polyethylene insulation. The method for manufacturing this kind of 150°C radiation cross-linked computer cable, high-density polyethylene resin, DuPont POE, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine, 1,3,5-triallyl-s-triazine-2,4,6- The triketone is made into the raw material of the insulating layer according to a certain weight ratio, and is subjected to banburying, kneading and extruding on the surface of the conductor, and the insulating layer is processed by the irradiation cross-linking process. Using this method, the computer cable has high temperature resistance, large carrying capacity, good insulation performance, and large allowable short-circuit current, which meets the needs of high-temperature equipment and site data systems.

Description

150°C radiation cross-linked computer cable and manufacturing method thereof

technical field

The invention relates to a cross-linked computer cable and a manufacturing method thereof, in particular to a 150°C irradiation cross-linked computer cable and a manufacturing method thereof.

Background technique

In the prior art, domestic computer cables generally use polyvinyl chloride insulated data cables, and this type of polyvinyl chloride insulated data cables is easy to age and crack due to its low temperature resistance (70-90°C), low ampacity , large dielectric loss, high toxicity index and poor environmental performance, etc., are limited in the application field and scope of application. At present, the European Union, the United States, Japan and other countries have higher and higher requirements for the production of cable products, and have formulated corresponding laws and regulations; for example, it is required that computer cables do not contain halogens, and do not produce harmful and corrosive gases. However, the existing polyvinyl chloride insulated data cables can no longer meet this need. In addition, the temperature resistance level of polyethylene insulation is low, and it is even more unsuitable for some occasions where the long-term working temperature is high. In order to solve this problem, the researchers have developed a computer cable insulated with cross-linked polyethylene to replace the traditional PVC insulated data cable.

There are two main methods of producing cable cross-linking: chemical cross-linking and physical cross-linking. Chemical crosslinking is divided into dry crosslinking and warm water crosslinking. Dry cross-linking is to cross-link polyethylene molecular chains after a certain period of time in high-pressure gas at a temperature of 300-400 °C. Warm water cross-linking is to soak the cable in warm water at 90°C for 5-7 hours to cross-link polyethylene molecular chains. Physical cross-linking, also known as radiation cross-linking, uses the high-energy electron beam emitted by the electron accelerator to bombard the cable insulation or sheath layer to break the polymer chain. The first point to be broken is called a free radical. , because the free radicals are unstable, they need to be recombined with each other. After recombination, the original chain molecular structure becomes a three-dimensional network molecular structure to form cross-linking. This cross-linking method will not affect the flame retardancy and electrical properties of the cable. performance.

The cross-linked data cables commonly used at home and abroad are generally chemical cross-linked control cables, and their temperature rating is only 90°C. Therefore, silicon rubber and fluoroplastic data cables are commonly used in control systems with higher temperature resistance levels. Due to its high price, complex processing technology, low mechanical strength, poor insulation performance and tear resistance, silicone rubber greatly limits its application in control cables; fluoroplastics are easy to crack due to their high price and complex processing technology And other shortcomings, the current application is not widespread.

Contents of the invention

The technical problem to be solved by the present invention is to provide a computer cable with a temperature resistance level up to 150° C. and a manufacturing method of the computer cable in order to overcome the disadvantages of the above-mentioned computer cable.

In order to solve the above technical problems, the technical scheme of the present invention is realized as follows: a 150°C radiation cross-linked computer cable, comprising an outer sheath 1, a first shielding layer 2, a first tape layer 3, a filling 4 and an inner covering wire 5. It is characterized in that: the outer protective layer 1 is the first shielding layer 2, the first shielding layer 2 is the first tape layer 3, and the first tape layer 3 contains the above-mentioned several inner covering wires 5; the inner covering Filling 4 is between the line 5 and the first tape layer 3;

The inner covering wire 5 includes a second shielding layer 51, a second tape layer 52, a conductor 53 and an insulating layer 54; the outer periphery of the inner covering wire 5 is the second shielding layer 51, and inside the second shielding layer 51 is the first Two wrapping layers 52, the second wrapping layer 52 contains several above-mentioned conductors 53, each of the conductors 53 is covered with an insulating layer 54, and the insulating layer 54 is in the middle of the second wrapping layer 52 For filling 4; the insulating layer 54 is an insulating layer of cross-linked polyethylene irradiated at 150°C.

The 150°C irradiated cross-linked polyethylene insulating layer is made of the following raw material proportions by weight:

High-density polyethylene resin 82～88

Dupont POE 12～18 parts

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.1～0.3 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.2～0.4 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.3～0.7 parts

A method for manufacturing a 150°C irradiation cross-linked computer cable, the steps are as follows: (1) wire-drawing the core-making metal, annealing the wire-drawing metal, and stranding the conductor 53; (2) preparing the raw material for the insulating layer 51, Then use a plastic mixer to mix the above-mentioned raw materials by weight at room temperature; (3) the above-mentioned prepared insulating layer 51 raw materials are mixed, opened, and added to the extruder, and the insulating layer is mixed on the extruder. 51 is extruded on the surface of the conductor 53; (4) adopting the radiation cross-linking process to carry out electron irradiation processing to the conductor extruded with the insulating layer by an electron accelerator; The conductor 1 is twisted into a cable core; (6) after the core is extruded and coated with the second tape layer 52 and the second shielding layer 53 in sequence, an inner covering wire 5 is formed, and the inner cover wire 5 is formed on the second tape layer 52 The inside is filled with filling 4; (7) the first wrapping layer 3 is covered on the outside of several inner wrapping wires 5, and the first wrapping layer 3 fastens and fixes several inner wrapping wires 5 into a circle. The outside of the tape layer 3 is covered with the first shielding layer 2 and the outer sheath layer 1 in turn, and the filling 4 is filled in the first tape layer.

The conditions for the irradiation crosslinking are: the irradiation dose is 10-20Mrd.

The beneficial effect of the present invention is that since the insulation layer of the computer cable adopts the 150°C irradiated cross-linked polyethylene insulation layer, the computer cable has high temperature resistance, large carrying capacity, excellent insulation electrical performance, good mechanical performance, and insulation aging resistance Strong, the advantages of greatly improving the allowable short-circuit current of the cable can meet the needs of high-temperature equipment, instruments and data input systems in high-temperature places.

Describe the present invention in detail below in conjunction with accompanying drawing.

Description of drawings

Figure 1: Schematic cross-sectional view of the present invention.

Detailed ways

In the figure: 1 is the outer sheath, 2 is the first shielding layer, 3 is the first tape layer, 4 is filling, 5 is the inner covering wire, 51 is the second shielding layer, 52 is the second tape layer, 53 is Conductor, 54 is insulating layer,

Wherein the outer sheath 1 is the first shielding layer 2, the first shielding layer 2 is the first tape layer 3, the first tape layer 3 contains the above-mentioned several inner covering wires 5, the first tape layer 3 is used for Tighten and fix the inner covering wire 5; the above-mentioned filling 4 is between the inner covering wire 5 and the first tape layer 3; the inner covering wire 5 includes a second shielding layer 51, a second tape layer 52, a conductor 53 and an insulating layer 54; the outer periphery of the inner covering wire 5 is a second shielding layer 51, and inside the second shielding layer 51 is a second tape layer 52, and the second tape layer 52 contains several above-mentioned conductors 53, so Outside each conductor 53 is the above-mentioned insulating layer 54, and between the insulating layer 54 and the second tape layer 52 is the filling 4; the insulating layer 54 is an insulating layer of cross-linked polyethylene irradiated at 150°C; see FIG. 1 shown.

The above-mentioned first shielding layer 2 and second shielding layer 51 are used to shield the electric field, which is beneficial to the stability of the transmission signal. Copper tape or braided copper wire is usually used, and the operating temperature is above 150 degrees.

The above-mentioned first tape layer 3 and the second tape layer 52 are respectively used to tighten the cable core formed by the inner cover wire 5 and the cable core formed by the conductor, so that the cable becomes round, and the commonly used tape material It is non-woven fabric, polyester tape and glass tape, etc., and its service temperature is above 150 degrees.

The above-mentioned 150°C irradiation cross-linked polyethylene insulating layer contains the following composition proportions in parts by weight:

High density polyethylene resin 82～88 parts

DuPont POE 12～18 parts

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.1～0.3 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.2～0.4 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.3～0.7 parts

Among them, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester is antioxidant 1010, N, N-bis[3-(3,5-di-tert-butyl- 4-hydroxyphenyl)propionyl]hydrazine is an antioxidant 1024, 1,3,5-triallyl-s-triazine-2,4,6-trione is a powdered cross-linking agent to improve the mechanical properties of products , heat resistance and weather resistance.

Example 1:

Above-mentioned insulating layer 2 takes raw material by following proportioning

High-density polyethylene resin 87 parts

Dupont POE 12 copies

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.1 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.2 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.7 parts

The manufacturing method of 150℃ radiation cross-linked computer cable is as follows:

(1) wire drawing the core metal, annealing the wire drawing metal, and twisting it into a conductor 53;

(2) Prepare the raw materials of the insulating layer 51, and then use a plastic mixer to stir the above-mentioned raw materials in parts by weight evenly at room temperature;

(3) Put the prepared insulating layer 51 raw materials into the extruder through banburying, kneading, and extruding the insulating layer 51 on the surface of the conductor 53 on the extruder;

(4) Carry out electron irradiation processing to the conductor extruding the insulating layer with an electron accelerator by irradiation cross-linking process;

(5) Twisting the above-mentioned multiple conductors 1 coated with an insulating layer into a cable core;

(6) After the cable core is extruded and coated with the second tape layer 52 and the second shielding layer 53 in sequence, an inner covering wire 5 is formed, and the inside of the second tape layer 52 is filled with filling 4;

(7) The first tape layer 3 is coated on the outside of several inner covering wires 5, and the first tape layer 3 fastens and fixes several inner covering wires 5 into a circle, and the outside of the first covering wire 3 is sequentially It is covered with a first shielding layer 2 and an outer sheath 1, and filled with filler 4 in the first tape layer.

The conditions for irradiation cross-linking are as follows: the irradiation dose is 10-20Mrd. The computer cable produced by this method has a high temperature resistance grade, can work under the temperature condition of 150° C., and meets the needs of high-temperature equipment, instruments and data input systems in high-temperature places, especially the working requirements in a long-term high-temperature state.

Example 2:

The above-mentioned 150°C irradiation cross-linked polyethylene insulating layer is made of the following raw materials in weight ratio:

High-density polyethylene resin 85 parts

Dupont POE 15 copies

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.2 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.3 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.5 parts

The insulating layer made of the above-mentioned various weight parts is processed into a computer data cable, and its temperature resistance level can reach 150°C after testing.

Example 3:

The above-mentioned 150°C irradiation cross-linked polyethylene insulating layer is made of the following raw materials in weight ratio:

High-density polyethylene resin 82 parts

Dupont POE 18 copies

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.3 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.4 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.3 parts

Computer cables with insulation layers made of the above-mentioned various weight parts are used for computer data cables, and the temperature resistance level can reach 150°C after testing.

Example 4:

The above-mentioned 150°C irradiation cross-linked polyethylene insulating layer is made of the following raw materials in weight ratio:

High-density polyethylene resin 88 parts

DuPont POE 17 copies

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.3 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.3 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.3 parts

Computer cables with insulation layers made of the above-mentioned various weight parts are used for computer data cables, and the temperature resistance level can reach 150°C after testing.

Example 5:

The above-mentioned 150°C irradiation cross-linked polyethylene insulating layer is made of the following raw materials in weight ratio:

High-density polyethylene resin 84 parts

DuPont POE 13 parts

Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.1 parts

N,N-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine 0.4 parts

1,3,5-triallyl-s-triazine-2,4,6-trione 0.7 parts

Computer cables with insulation layers made of the above-mentioned various weight parts are used for computer data cables, and the temperature resistance level can reach 150°C after testing.

For the computer data cables made above, the test results of the original mechanical and physical properties of the cable insulation, the air aging test, the thermal extension test and the impact embrittlement temperature all conform to the national standard GB/T2951.2-1997 and GB/T5470 indicators:

Table 1 Test results of cross-linked computer cables irradiated at 150°C

serial number Pilot projects unit indicators 1   Original mechanical properties 1.1 tensile strength N/ ^mm2 ≥12.5 1.2 elongation at break % ≥250 2 Air aging chamber test (180±2℃; 168h) 2.1 Tensile strength change rate % ±20 2.2 elongation at break % ±20 3 Thermal extension test (200℃, 0.2Mpa, 15min) 3.1 elongation under load % ≤175 3.2 Permanent deformation rate % ≤15 4 Impact embrittlement temperature 4.1 Test temperature ℃ -40 4.2 Impact embrittlement properties Number of failures ≤15/30

The above-mentioned GB/T2951.2-1997 is a general test method for cable insulation; GB/T5470 is a test method for impact embrittlement temperature of plastics.

Claims (5)

1. 150 ℃ of irradiation cross-linked computer cables, contain outer jacket (1), first screen (2), first belting layer (3), fill (4) and interior envelope curve (5), it is characterized in that: wherein be first screen (2) in the outer jacket (1), be first belting layer (3) in first screen (2), first belting layer (3) contains above-mentioned several interior envelope curves (5); It between interior envelope curve (5) and first belting layer (3) above-mentioned filling (4);

Envelope curve (5) comprises secondary shielding layer (51), second belting layer (52), conductor (53) and insulating barrier (54) in described; Described secondary shielding layer (51) inboard is second belting layer (52), described second belting layer (52) contains several above-mentioned conductors (53), described each conductor (53) is outer to be above-mentioned insulating barrier (54), is filling (4) between described insulating barrier (54) and second belting layer (52); Described insulating barrier (54) is 150 ℃ of IXPE insulating barriers.

2. according to described a kind of 150 ℃ of irradiation cross-linked computer cables of claim 1, it is characterized in that: described 150 ℃ of IXPE insulating barriers are to be made by the raw material proportioning of following weight portion:

82～88 parts of high-density polyethylene resins

12～18 parts of the POE of Du Pont

0.1～0.3 part of four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester

N, 0.2～0.4 part of two [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionyl] hydrazine of N-

1,3,5-triallyl-guanamine, 4,0.3～0.7 part of 6-triketone.

3. according to described a kind of 150 ℃ of irradiation cross-linked computer cables of claim 2, it is characterized in that: described 150 ℃ of IXPE insulating barriers are to be made by the raw material proportioning of following weight portion:

85 parts of high-density polyethylene resins

15 parts of the POE of Du Pont

0.2 part of four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester

N, 0.3 part of two [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionyl] hydrazine of N-

1,3,5-triallyl-guanamine, 4,0.5 part of 6-triketone.

4. method of making 150 ℃ of irradiation cross-linked computer cables is characterized in that step is as follows:

(1) the coremaking metal is carried out wire drawing, to described wire drawing metal annealing, strand is made conductor 53;

(2) raw material of preparation insulating barrier 51 takes by weighing the raw material of following weight portion

82～88 parts of high-density polyethylene resins

12～18 parts of the POE of Du Pont

0.1～0.3 part of four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester

N, 0.2～0.4 part of two [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionyl] hydrazine of N-

1,3,5-triallyl-guanamine, 4,0.3～0.7 part of 6-triketone

With plastic mixer with the raw material of above-mentioned weight portion, stir at normal temperatures;

(3) with the above-mentioned insulating barrier that has prepared 51 raw materials through banburying, open refining, join on the extruder, on the extruder insulating barrier 51 is being extruded on the surface of described conductor 53;

(4) adopt cross-linking radiation technology the conductor that squeezes good insulating barrier to be carried out electron irradiation processing with electron accelerator;

(5) above-mentioned many conductor 1 strands that have been coated with insulating barrier are made cable core;

(6) after the cable core external compression is coated with second belting layer 52 and secondary shielding layer 53 successively, form envelope curve 5 in, be filled with in the inside of second belting layer 52 and fill 4;

(7) external packets of envelope curve 5 is covered with first belting layer 3 in several, first belting layer 3 is tightened envelope curve in several 5 and is fixed into a circle, be coated with first screen 2 and outer jacket 1 successively in the outside of first belting layer 3, in first belting layer, be filled with and fill 4.

5. the method for 150 ℃ of irradiation cross-linked computer cables of a kind of manufacturing according to claim 4, it is characterized in that: the condition of described cross-linking radiation is: irradiation dose is 10～20Mrd.

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