CN107353473A - A kind of micromolecular compound filling high-voltage cross-linking polythene cable material and preparation method thereof - Google Patents

Abstract

The invention provides a kind of micromolecular compound filling high-voltage cross-linking polythene cable material, and the CABLE MATERIALS is prepared by the raw material including following parts by weight：100 parts of polyvinyl resin；0.5~20 part of crosslinking agent；0.5~10 part of antioxidant；0.1~30 part of micromolecular compound.The beneficial effect of the invention is that the high-voltage cross-linking polythene cable material has excellent mechanical performance, by selecting suitable micromolecular compound, the electrical properties such as breakdown strength and the barotolerance of high-voltage cross-linking polythene cable material can be further lifted, can effectively extend the application of crosslinkable polyethylene cable material.

Description

A small molecular compound filled high-voltage cross-linked polyethylene cable material and its preparation method

technical field

The invention belongs to the technical field of cable materials, and in particular relates to a high-voltage cross-linked polyethylene cable material and a preparation method thereof.

Background technique

As a supporting industry of the power industry, one of the pillar industries of the national economy, the wire and cable industry plays an extremely important role and position in the national economy. Wires and cables are key components of power transmission, and the insulating material is one of the key factors determining the withstand voltage of the cable. Due to its good heat resistance and mechanical properties, and large transmission capacity, XLPE cables are not only suitable for medium and low voltages, but also can be applied to high and ultra-high voltages. Because of its excellent comprehensive properties, such as good electrical properties, high breakdown electric field strength, small dielectric loss tangent, high insulation resistance; good heat resistance and aging resistance, high allowable working temperature; large carrying capacity , suitable for high drop and vertical laying, etc. XLPE power cables have received more and more attention and become the main material of high-voltage cables in recent years. Studies have shown that the performance of cross-linked polyethylene can be further improved by introducing suitable other components.

Chinese patent application 201610762167.0 proposes a 220kV low-by-product cross-linkable polyethylene insulating material and its preparation method, through the use of specific components of low-density polyethylene, antioxidants, cross-linking agents and cross-linking accelerators , can avoid problems such as high impurity content and internal pinholes in the prepared product, and can meet the requirements for the manufacture of 220kV cable insulation materials. However, the mechanical properties of the cross-linked polyethylene cable material are general, the electrical properties such as breakdown strength and high-voltage resistance are not outstanding enough, and the application range is narrow.

Contents of the invention

The purpose of the present invention is to provide a high-voltage cross-linked polyethylene cable material and its preparation method. By filling with suitable small molecular compounds, the prepared high-voltage cross-linked polyethylene cable material has excellent mechanical properties, and at the same time further improves the high-voltage cross-linking performance. The electrical properties such as breakdown strength and high voltage resistance of polyethylene cable materials can effectively expand the application range of cross-linkable polyethylene cable materials.

In order to achieve the above object, the technical solution created by the present invention is achieved in this way:

The invention provides a high-voltage cross-linked polyethylene cable material, which is prepared from the following raw materials in parts by weight: 100 parts of polyethylene resin; 0.5-20 parts of crosslinking agent; 0.5-10 parts of antioxidant; 0.1-30 parts of small molecule compounds.

Preferably, the small molecule compound is at least one of perfluoropolyether oil, insulating oil, silicone oil or fluorosilicone oil.

Preferably, the perfluoropolyether oil is at least one selected from K-type, Y-type, Z-type or D-type perfluoropolyether oils.

Preferably, the insulating oil is selected from at least one of transformer oil, capacitor oil, cable oil or switch oil.

Preferably, the transformer oil is selected from at least one of 25# transformer oil, 45# transformer oil, and 10# transformer oil, from 1,1-phenylxylylethane (PXE), phenylethane At least one of phenylethane (PEPE), benzyltoluene blend oil (M/DBT).

Preferably, the silicone oil is selected from the group consisting of

At least one of, wherein R is an alkyl group, an aryl group, R' is an alkyl group, an aryl group, hydrogen, a carbon functional group or a polyether chain; X is an alkyl group, an aryl group, an alkenyl group, hydrogen, a hydroxyl group, Alkoxy, acetoxy, chlorine, carbon functional groups or polyether chains; n, m=0, 1, 2, 3....

Preferably, the fluorosilicone oil is trifluoropropylvinyl-terminated siloxane.

Preferably, the polyethylene resin is ultra-high molecular weight polyethylene (UHMWPE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) or ultra-low-density polyethylene (ULDPE) ) at least one.

Preferably, the crosslinking agent is dicumyl peroxide (DCP), benzoyl peroxide (BPO), di-tert-butyl peroxide (DTBA), dicumyl hydroperoxide (DBHP), At least one of diethylenetriamine (DTA) or 2,5-dimethyl-2,5-di-tert-butylperoxyhexane (bis-25).

Preferably, the antioxidant is antioxidant 1010, antioxidant 1076, antioxidant CA, antioxidant 164, antioxidant DNP, antioxidant DLTP, antioxidant TPP, antioxidant MB or antioxidant At least one of the oxygen agents 264.

Preferably, the amount of the cross-linking agent is 0.5-5 parts or 5-10 parts or 10-20 parts, more preferably, the amount of the cross-linking agent is 0.5-5 parts.

Preferably, the amount of the antioxidant is 0.5-4 parts or 4-7 parts or 7-10 parts, more preferably, the amount of the antioxidant is 1-4 parts.

Preferably, the small molecule compound is 0.1-10 parts or 10-20 parts or 20-30 parts; more preferably, the small molecule compound is 10-20 parts.

The present invention also proposes a preparation method of high-voltage cross-linked polyethylene cable material, comprising the following steps:

1) drying of polyethylene resin;

2) Preparation of pre-dispersed masterbatch: melt-blending the cross-linking agent, antioxidant, small molecular compound and part of the polyethylene resin dried in step 1) in an extruder to prepare different pre-dispersed masterbatches; Among them, the crosslinking agent, antioxidant, small molecular compound and polyethylene resin are proportioned according to the following parts by weight: 100 parts of polyethylene resin; 0.5 to 40 parts of crosslinking agent; 0.5 to 20 parts of antioxidant; 0.1 parts of small molecular compound ~60 copies;

3) Crushing and drying of the pre-dispersed masterbatch: the pre-dispersed masterbatch obtained in step 2) is crushed and then dried.

4) Preparation of cable material: mix the pre-dispersed masterbatch obtained in step 3) with the remaining polyethylene resin in step 1), add to a twin-screw extruder to extrude and pelletize, and dry to obtain the cable material.

Preferably, in step 1), the drying temperature is 60-100° C., and the drying time is 10-24 hours.

Preferably, in step 3), the drying temperature is 60-100° C., and the drying time is 8-12 hours.

Preferably, the temperature of the extruder is set as follows: the feeding section is 105-135°C, the compression section is 110-180°C, the homogenization section is 110-180°C, and the head part is 110-180°C; the speed of the extruder is The setting is: 30-200r/min; the extrusion process of the extruder adopts air cooling.

Preferably, the temperature of the twin-screw extruder is set as follows: feeding section 105-135°C, compression section 110-180°C, homogenization section 110-180°C, head part 110-180°C; the twin-screw extruder The rotating speed of the extruder is set at 30-200r/min; the extrusion process of the twin-screw extruder adopts air cooling.

Compared with the prior art, the high-voltage cross-linked polyethylene cable material filled with the small molecule compound of the present invention has the following advantages:

The invention proposes a high-voltage cross-linked polyethylene cable material filled with small molecular compounds and a preparation method thereof. The high-voltage cross-linked polyethylene cable material is prepared by filling components such as small molecular compounds. The high-voltage XLPE cable material has excellent mechanical properties. By selecting a suitable small molecule compound, the electrical properties such as the breakdown strength and high-voltage resistance of the high-voltage XLPE cable material can be further improved, and the cross-linking capacity can be effectively expanded. The scope of application of polythene cable material.

detailed description

The present invention will be further described below in conjunction with specific examples, and these examples are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention.

Example 1

A high-pressure cross-linked polyethylene cable material filled with a small molecule compound, the pre-dispersed masterbatch of the cable material is prepared from raw materials including the following parts by weight:

The preparation method of this cable material comprises the following steps:

Step 1): Dry all ULDPE in a blast drying oven at 60°C for 12 hours;

Step 2): Preparation of pre-dispersed master batch: Melt and blend accurately weighed ULDPE, crosslinking agent, antioxidant 1010 and perfluoropolyether oil in an extruder to obtain a pre-dispersed master batch. The temperature setting of the extruder is: 110° C. in the feeding section, 115° C. in the compression section, 120° C. in the homogenizing section, and 115° C. in the head part; the speed setting of the extruder is: 30 r/min.

Step 3): Crushing the pre-dispersed masterbatch obtained in step 2) and drying in a blast drying oven at a drying temperature of 60°C for 8 hours;

Step 4): Preparation of cable material: ULDPE and pre-dispersed masterbatch are proportioned according to the following parts by weight:

ULDPE 100 parts;

50 parts of pre-dispersed masterbatch.

Accurately weigh the raw materials according to the formula, put them into the twin-screw extruder and extrude and granulate. The head part is 115°C; the speed of the extruder is set at 50r/min. Air cooling is used during extrusion into strands.

Example 2

A high-pressure cross-linked polyethylene cable material filled with a small molecule compound, the pre-dispersed masterbatch of the cable material is prepared from raw materials including the following parts by weight:

Step 1): Dry all the HDPE in a blast drying oven at 80°C for 12 hours;

Step 2): the preparation of predispersed masterbatch: accurately weighed HDPE, crosslinking agent, antioxidant 1010 and perfluoropolyether oil are melt-blended in an extruder, and the temperature of the extruder is set to 120° C. in the feeding section, 135° C. in the compression section, 145° C. in the homogenizing section, and 140° C. in the head portion; the speed of the extruder is set at 80 r/min.

Step 3): The pre-dispersed masterbatch is crushed and dried in a blast drying oven at a drying temperature of 60°C for 8 hours;

Step 4): Preparation of cable material: HDPE and pre-dispersed masterbatch are proportioned according to the following parts by weight:

HDPE 100 parts;

40 parts of pre-dispersed masterbatch.

Accurately weigh the raw materials according to the formula, put them into a twin-screw extruder for extrusion and granulation, the temperature of the feeding section of the twin-screw extruder is 120°C, the temperature of the compression section is 135°C, the temperature of the homogenization section is 145°C, and the head The partial temperature is 140° C.; the rotational speed of the twin-screw extruder is set at 100 r/min. Air cooling is used during extrusion into strands.

Example 3

A high-pressure cross-linked polyethylene cable material filled with a small molecule compound, the pre-dispersed masterbatch of the cable material is prepared from raw materials including the following parts by weight:

ULDPE and pre-dispersed masterbatch are composed according to parts by weight:

ULDPE 100 parts;

25 parts of pre-dispersed masterbatch.

The preparation of the pre-dispersed masterbatch and the extrusion and granulation of the cable material are the same as in Example 1.

Example 4

A high-pressure cross-linked polyethylene cable material filled with a small molecule compound, the pre-dispersed masterbatch of the cable material is prepared from raw materials including the following parts by weight:

HDPE and pre-dispersed masterbatch are composed according to parts by weight:

HDPE 100 parts;

100 parts of pre-dispersed masterbatch.

The preparation of the pre-dispersed masterbatch and the extrusion and granulation of the cable material are the same as in Example 2.

Example 5

A small molecular compound filled high-voltage cross-linked polyethylene cable material, the different pre-dispersed masterbatches of the cable material are prepared from raw materials including the following parts by weight:

Pre-dispersed masterbatch:

Polyethylene resin and pre-dispersed masterbatch are composed according to the following parts by weight:

HDPE 100 parts;

80 parts of pre-dispersed masterbatch.

The preparation of the pre-dispersed masterbatch and the extrusion and granulation of the cable material are the same as in Example 2.

Example 6

A small molecular compound filled high-voltage cross-linked polyethylene cable material, the different pre-dispersed masterbatches of the cable material are prepared from raw materials including the following parts by weight:

Pre-dispersed masterbatch:

Polyethylene resin and pre-dispersed masterbatch are composed according to parts by weight:

ULDPE 100 parts;

30 parts of pre-dispersed masterbatch.

The preparation of the pre-dispersed masterbatch and the extrusion and granulation of the cable material are the same as in Example 1.

Table 1 shows the performance test results of the cable materials of Examples 1-6.

Table 1

The addition of small molecular compounds is beneficial to the uniform dispersion of cross-linking agents and antioxidants, and improves cross-linking efficiency and cross-linking uniformity. Under the action of the cross-linking agent, polyethylene becomes a cross-linked polyethylene material with a three-dimensional space network structure. Due to the interaction of chemical bonds between polyethylene macromolecular chains, the connection between molecules is effectively increased, resulting in high-fraction chains. The force between them increases, and the tensile strength increases. Due to the high gel content of the material, the movement of the chain segments is restricted, the material shows brittleness, and the elongation at break decreases. The addition of small molecular compounds plays a lubricating role, reduces the balance torque, improves the processing performance, and at the same time, has a certain effect on improving the mechanical properties of the material. In addition, the addition of small molecular compounds fills the free volume of cross-linked polyethylene, and because of its own insulation, it can effectively reduce the migration rate of carriers and improve the insulation performance of the material.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the scope of protection of the present invention.

Claims (10)

1. a kind of micromolecular compound fills high-voltage cross-linking polythene cable material, it is characterised in that：The CABLE MATERIALS is by including as follows The raw material of parts by weight is prepared：100 parts of polyvinyl resin；0.5~20 part of crosslinking agent；0.5~10 part of antioxidant；Small molecule 0.1~30 part of compound.

2. high-voltage cross-linking polythene cable material according to claim 1, it is characterised in that：The micromolecular compound is perfluor At least one of polyether oil, insulating oil, silicone oil or fluorosilicon oil.

3. high-voltage cross-linking polythene cable material according to claim 2, it is characterised in that：The perfluoro polyether oil be selected from K-type, At least one of Y types, Z-type or D type perfluoro polyether oils.

4. high-voltage cross-linking polythene cable material according to claim 2, it is characterised in that：The insulating oil is selected from transformer At least one of oil, capacitor oil, cable oil or circuit-breaker oil.

5. high-voltage cross-linking polythene cable material according to claim 4, it is characterised in that the transformer oil becomes selected from 25# At least one of depressor oil, 45# transformer oil or 10# transformer oil, the capacitor oil is selected from 1,1- phenyl xylyls At least one of ethane (PXE), phenyl ethylbenzene ethane (PEPE) or benzyl toluene class alloyd oil (M/DBT).

6. high-voltage cross-linking polythene cable material according to claim 2, it is characterised in that：The silicone oil is selected from general structure

At least one of, wherein R is alkyl, aryl, and R' is alkyl, aryl, hydrogen, carbon functional group or polyether chain；X be alkyl, Aryl, alkenyl, hydrogen, hydroxyl, alkoxy, acetoxyl group, chlorine, carbon functional group or polyether chain；N, m=0,1,2,3 ....

7. high-voltage cross-linking polythene cable material according to claim 2, it is characterised in that：The fluorosilicon oil is trifluoro propyl second Alkenyl endcapped siloxanes.

8. the preparation method of the high-voltage cross-linking polythene cable material described in claim any one of 1-7, it is characterised in that including such as Lower step：

1) drying of polyvinyl resin；

2) preparation of pre-dispersed masterbatch：By crosslinking agent, antioxidant, micromolecular compound and the dried part polyethylene of step 1) Resin melt blending in an extruder, is prepared pre-dispersed masterbatch；Wherein crosslinking agent, antioxidant, micromolecular compound and poly- Vinyl matches according to following parts by weight：100 parts of polyvinyl resin；0.5~40 part of crosslinking agent；0.5~20 part of antioxidant； 0.1~60 part of micromolecular compound；

3) pre-dispersed masterbatch is broken and dries：The pre-dispersed masterbatch that step 2) is obtained is dried after crushing；

4) preparation of CABLE MATERIALS：Added after the pre-dispersed masterbatch that step 3) obtains is mixed with the remaining polyvinyl resin of step 1) Extruding pelletization in double screw extruder, drying CABLE MATERIALS.

9. the preparation method of high-voltage cross-linking polythene cable material according to claim 8, it is characterised in that：The extruder Temperature setting is：105~135 DEG C of feeding section, 110~180 DEG C of compression section, 110~180 DEG C of homogenizing zone, head section 110~ 180℃；The rotating speed of the extruder is arranged to：30~200r/min；The extruder is extruded into bar process and cooled down using air.

10. the preparation method of high-voltage cross-linking polythene cable material according to claim 8, it is characterised in that：The twin-screw The temperature setting of extruder is：105~135 DEG C of feeding section, 110~180 DEG C of compression section, 110~180 DEG C of homogenizing zone, chain-drive section Divide 110~180 DEG C；The rotating speed of the double screw extruder is arranged to：30~200r/min；The double screw extruder is extruded into Bar process is cooled down using air.