阅读说明：本技术 一种抗焦烧化学交联聚乙烯电缆绝缘料及其制备方法 (Scorch-resistant chemical crosslinked polyethylene cable insulating material and preparation method thereof ) 是由 李顺利 蔡煜明 赵勇 俞丽琴 莫建双 何伟勤 郑颜 陈维清 李学贵 张泽彬 黄礼 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种抗焦烧化学交联聚乙烯电缆绝缘料及其制备方法,旨在提供了一种使用制备材料不会被烧毁的温度进行生产的抗焦烧化学交联聚乙烯电缆绝缘料及其制备方法。它包括制备箱,制备箱顶面上设有入料口、注液口和储物口,入料口的硬块一上滚动连接有搅拌棒一,注液口的硬块二上滚动连接有搅拌棒二,制备箱内安装有配有加热电丝的加热搅拌罐和搅拌罐,搅拌棒一的一端置于加热搅拌罐内,搅拌棒二的一端置于搅拌罐内,加热搅拌罐的底部和搅拌罐的底部可拆卸连接有阀门,制备箱底面上设有取料门。本发明的有益效果是：可达到不会被烧毁的温度进行生产的目的；可增大制备箱内材料的搅拌效果；可让材料聚集于筛网上。(The invention discloses a scorch-resistant chemical cross-linked polyethylene cable insulating material and a preparation method thereof, and aims to provide a scorch-resistant chemical cross-linked polyethylene cable insulating material which is produced at a temperature at which the preparation material cannot be burned and a preparation method thereof. It is including preparing the case, be equipped with the pan feeding mouth on the preparation roof, annotate liquid mouth and storing mouth, roll connection has stirring rod one on the hard piece one of pan feeding mouth, roll connection has stirring rod two on the hard piece two of annotating the liquid mouth, install heating agitator tank and the agitator tank of being furnished with the heating wire in the preparation incasement, in the heating agitator tank was arranged in to the one end of stirring rod one, in the agitator tank was arranged in to the one end of stirring rod two, the bottom of heating agitator tank and the bottom of agitator tank can be dismantled and be connected with the valve, be equipped with on the bottom surface of the preparation case and get the bin gate. The invention has the beneficial effects that: the purpose of production at a temperature that cannot be burnt out can be achieved; the stirring effect of the materials in the preparation box can be improved; allowing the material to collect on the screen.)

1. The scorch-resistant chemical cross-linked polyethylene cable insulation material is characterized by comprising the following raw materials in parts by weight: 90-100 parts of polyethylene, 0.2-1.5 parts of antioxidant, 1-2.5 parts of cross-linking agent, 1-3 parts of auxiliary cross-linking agent, 1-3 parts of scorch resistant agent and 2-3 parts of compatibilizer.

2. The scorch-resistant chemically crosslinked polyethylene cable insulation material according to claim 1, wherein the polyethylene is a mixture of linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min, and the mass ratio of the polyethylene to the linear polyethylene is 66-74: 6-13: 6-13; the antioxidant is a mixture of an antioxidant 300, an antioxidant DSTP and an antioxidant DLTP, and the mass ratio of the antioxidant to the antioxidant is 1: 0.5-0.8: 0.8-0.85; the cross-linking agent is dicumyl peroxide; the auxiliary crosslinking agent is benzoyl peroxide; the scorch inhibitor is N-cyclohexyl thiophthalimide; the compatibilizer is a modified styrene-ethylene-butylene-styrene block copolymer.

3. A preparation method of a scorch-resistant chemical crosslinked polyethylene cable insulation material is characterized by adopting preparation equipment of the scorch-resistant chemical crosslinked polyethylene cable insulation material, and comprises the following steps:

the method comprises the following steps: weighing linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min according to the proportion, putting the three linear polyethylenes into a heating stirring tank (24) for heating, enabling the three linear polyethylenes to reach a molten state when the temperature is up to 95 ℃, and stirring in the heating stirring tank (24) to realize more comprehensive mixing to obtain a polyethylene mixture;

step two: weighing the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP according to the proportion, and injecting the antioxidant DSTP and the antioxidant DLTP into a stirring tank (29) for complete stirring and mixing work to obtain an antioxidant mixture;

step three: after the mixture in the heating stirring tank (24) is mixed for 20min, the polyethylene mixture and the antioxidant mixture fall into the bottom of the preparation box (1), and simultaneously dicumyl peroxide, benzoyl peroxide, N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene segmented copolymer are added, and the scorch-resistant chemical crosslinking polyethylene cable insulating material can be obtained through crosslinking reaction.

4. The preparation method of the scorch-resistant chemical crosslinking polyethylene cable insulation material according to claim 3, characterized in that the preparation device of the scorch-resistant chemical crosslinking polyethylene cable insulation material comprises a preparation box (1), the top surface of the preparation box (1) is provided with a feeding port (2), a liquid injection port (3) and a storage port (4), the feeding port (2) is provided with a first hard block (5), the first hard block (5) is connected with a first stirring rod (7), the liquid injection port (3) is provided with a second hard block (6), the second hard block (6) is connected with a second stirring rod (8), the preparation box (1) is internally provided with a heating stirring tank (24) and a stirring tank (29), the heating stirring tank (24) is arranged below the feeding port (2), one end of the first stirring rod (7) is arranged in the heating stirring tank (24), and the heating stirring tank (24) is uniformly provided with a plurality of heating electric wires (25), the below of annotating liquid mouth (3) is arranged in agitator tank (29), in agitator tank (29) was arranged in to the one end of stirring rod two (8), the outside of preparation case (1) is all arranged in to the other end of stirring rod one (7) and the other end of stirring rod two (8), all detachable the being connected with valve (26) of the bottom of heating agitator tank (24) and the bottom of agitator tank (29), be equipped with export (22) on preparation case (1) bottom surface, export (22) department can be dismantled and be connected with and get bin gate (23).

5. The scorch-resistant chemical cross-linked polyethylene cable insulation material as claimed in claim 4, wherein the preparation box (1) is provided with a first motor (11), a display (21) and a control board (19), the first motor (11) is provided with a first motor shaft (13), the first motor shaft (13) is provided with a first gear (15), the first hard block (5) is provided with a first rolling bearing (9), the first stirring rod (7) is connected with the first hard block (5) through the first rolling bearing (9), the first stirring rod (7) outside the preparation box (1) is provided with a second gear (16), the second gear (16) is meshed with the first gear (15), and the display (21) and the first motor (11) are both electrically connected with the control board (19).

6. The scorch-resistant chemical cross-linked polyethylene cable insulation material as claimed in claim 4, wherein a second motor (12) and a switch (20) are installed on the preparation box (1), the second motor (12) is electrically connected with the switch (20), a second motor shaft (14) is installed on the second motor (12), a third gear (17) is installed on the second motor shaft (14), a second rolling bearing (10) is installed on the second hard block (6), the second stirring rod (8) is connected with the second hard block (6) through the second rolling bearing (10), a fourth gear (18) is installed on the second stirring rod (8) outside the preparation box (1), and the fourth gear (18) is meshed with the third gear (17).

7. The scorch-resistant chemical cross-linked polyethylene cable insulation material as claimed in claim 5 or 6, wherein a plurality of first stirring plates (30) are uniformly installed on the first stirring rod (7) in the heating stirring tank (24), the lengths of the first stirring plates (30) are sequentially increased from top to bottom on the first stirring rod (7), a plurality of openings (32) are uniformly distributed on the first stirring plates (30), and a plurality of second stirring plates (31) are uniformly installed on the second stirring rod (8) in the stirring tank (29).

8. The scorch-resistant chemical cross-linked polyethylene cable insulation as claimed in claim 7, wherein the first stirring rod (7) and the first stirring plate (30) are sleeved with protective layers (35).

9. The scorch-resistant chemical cross-linked polyethylene cable insulation material as claimed in claim 4, wherein the heating and stirring tank (24) and the stirring tank (29) are respectively provided with a limiting groove (27), the limiting grooves (27) are connected with a sealing block (28), and the heating and stirring tank (24) and the stirring tank (29) are respectively detachably connected with the valve (26) through the limiting grooves (27).

10. The scorch-resistant chemical cross-linked polyethylene cable insulation material as claimed in claim 4, wherein the bottom surface of the preparation box (1) is provided with a screen (33), the outer edge of the screen (33) is provided with four inclined blocks (34), the inclined blocks (34) correspond to the four side surfaces of the preparation box (1) one by one, one surface of each inclined block (34) is connected with the preparation box (1), the other surface of each inclined block (34) is connected with the screen (33), and an angle between an inclined plane where the inclined blocks (34) are located and a plane where the screen (33) is located is an obtuse angle α.

Technical Field

The invention relates to the technical field of cable insulation materials, in particular to a scorch-resistant chemical crosslinking polyethylene cable insulation material and a preparation method thereof.

Background

The cable includes power cable, control cable, compensation cable, shielding cable, high-temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable and the like. They are composed of single or multi-strand wires and insulating layers, and are used for connecting circuits, electric appliances and the like. The cable insulation material has the effects of protecting cable wires, having good insulation performance and mechanical performance, and also has certain flame retardant and heat resistant performances. Therefore, with the progress of society and the deepening of environmental protection concept, the social demand of the cable insulating material is higher and higher, and the progress of the structure of the cable insulating material is faster and faster.

However, the existing cable insulation material is generally calcined at high temperature during production, but many prepared materials are very easy to burn out in the high-temperature calcination environment due to low temperature resistance level, so that the available production period for preparing the cable is severely limited, the actual production efficiency is further influenced, and the production cost is increased.

Disclosure of Invention

The invention provides a scorch-resistant chemical crosslinking polyethylene cable insulating material produced at a temperature at which a preparation material cannot be burnt and a preparation method thereof, aiming at overcoming the defect of high-temperature calcination adopted in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the scorch-resistant chemical cross-linked polyethylene cable insulation material comprises the following raw materials in parts by weight: 90-100 parts of polyethylene, 0.2-1.5 parts of antioxidant, 1-2.5 parts of cross-linking agent, 1-3 parts of auxiliary cross-linking agent, 1-3 parts of scorch resistant agent and 2-3 parts of compatibilizer.

The polyethylene is used as a main base material in the formula, the antioxidant is added to delay or inhibit the oxidation process of the polyethylene, so that the aging of the polyethylene is prevented, the service life is prolonged, the scorch-resistant agent has good scorch-resistant effect, the crosslinking agent and the auxiliary crosslinking agent are materials for facilitating the reaction of the polyethylene and the scorch-resistant agent to obtain the scorch-resistant chemical crosslinking polyethylene cable insulation material, and the compatibilizer is a material for facilitating the combination of two incompatible polymers into a whole by virtue of intermolecular bonding force, so as to obtain the stable additive of the blend. -

Preferably, the polyethylene is a mixture of linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min, and the mass ratio of the polyethylene to the melt index of the polyethylene is 66-74: 6-13: 6-13; the antioxidant is a mixture of an antioxidant 300, an antioxidant DSTP and an antioxidant DLTP, and the mass ratio of the antioxidant to the antioxidant is 1: 0.5-0.8: 0.8-0.85; the cross-linking agent is dicumyl peroxide; the auxiliary crosslinking agent is benzoyl peroxide; the scorch inhibitor is N-cyclohexyl thiophthalimide; the compatibilizer is a modified styrene-ethylene-butylene-styrene block copolymer. The design is that the weight ratio of the mixture of the linear polyethylene with the melting index of 1.8-2g/10min, the linear polyethylene with the melting index of 18.5-21.5g/10min and the linear polyethylene with the melting index of 3.7-4.3g/10min is 66-74: 6-13: the mass ratio of 6-13 can be smoothly fused to obtain a polyethylene mixture, and the mass ratio of the mixture of the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP is 1: 0.5-0.8: the mass ratio of 0.8-0.85 can be smoothly blended to obtain an antioxidant mixture, the dicumyl peroxide and the benzoyl peroxide are added to obtain the material of the polyethylene cable insulating material by crosslinking the polyethylene mixture and the N-cyclohexyl thiophthalimide under the action of the N-cyclohexyl thiophthalimide, and the antioxidant mixture is a material for delaying or inhibiting the polyethylene oxidation process.

A preparation method of a scorch-resistant chemical crosslinked polyethylene cable insulating material is manufactured by adopting preparation equipment of the scorch-resistant chemical crosslinked polyethylene cable insulating material, and comprises the following steps:

the method comprises the following steps: weighing linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min according to the proportion, putting the three linear polyethylenes into a heating stirring tank (24) for heating, enabling the three linear polyethylenes to reach a molten state when the temperature is up to 95 ℃, and stirring in the heating stirring tank (24) to realize more comprehensive mixing to obtain a polyethylene mixture;

step two: weighing the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP according to the proportion, and injecting the antioxidant DSTP and the antioxidant DLTP into a stirring tank (29) for complete stirring and mixing work to obtain an antioxidant mixture;

step three: after the mixture in the heating stirring tank (24) is mixed for 20min, the polyethylene mixture and the antioxidant mixture fall into the bottom of the preparation box (1), and simultaneously dicumyl peroxide, benzoyl peroxide, N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene segmented copolymer are added, and the scorch-resistant chemical crosslinking polyethylene cable insulating material can be obtained through crosslinking reaction.

Preferably, the preparation equipment for the scorch-resistant chemical crosslinking polyethylene cable insulation material comprises a preparation box, wherein a feeding port, a liquid injection port and a storage port are arranged on the top surface of the preparation box, a first hard block is installed on the feeding port, a first stirring rod is connected to the first hard block, a second hard block is installed on the liquid injection port, a second stirring rod is connected to the second hard block, a heating stirring tank and a stirring tank are installed in the preparation box, the heating stirring tank is arranged below the feeding port, one end of the first stirring rod is arranged in the heating stirring tank, a plurality of heating electric wires are uniformly installed on the heating stirring tank, the stirring tank is arranged below the liquid injection port, one end of the second stirring rod is arranged in the stirring tank, the other end of the first stirring rod and the other end of the second stirring rod are both arranged outside the preparation box, and the bottom of the heating stirring tank and the bottom of the stirring tank are both detachably connected with valves, an outlet is arranged on the bottom surface of the preparation tank, and a material taking door is detachably connected to the outlet. The design is through the pan feeding mouth on the preparation roof surface can put into the material that needs the heating and melting to burn when insulating material preparation, then can pour into required liquid material when insulating material preparation through annotating the liquid mouth, can place required material when insulating material preparation through the storing mouth. The stirring rod I connected with the hard block on the feeding port can have a stirring effect on materials in the heating stirring tank, a plurality of heating electric wires uniformly installed on the heating stirring tank are parts required by the heating effect of the heating stirring tank, and the stirring rod II connected with the hard block on the liquid injection port can have a stirring effect on the materials of the stirring tank. The bottom of the heating stirring tank and the bottom of the stirring tank are manually controlled, so that materials in the heating stirring tank and the stirring tank can be dissolved into the bottom of the preparation box in a homeotropic manner, and then other materials required by preparation can be placed from the storage opening, so that the preparation work of the insulating material can be smoothly carried out.

Preferably, install motor one, display and control panel on the preparation case, install motor shaft one on the motor one, install gear one on the motor shaft one, install antifriction bearing one on the hard piece one, stirring rod one is connected with hard piece one through antifriction bearing one, install gear two on the stirring rod one outside the preparation case, gear two meshes with gear one mutually, the display all is connected with the control panel electricity with motor one. The display and the motor I which are electrically connected with the control panel can be opened through the control panel, the motor shaft I arranged on the motor I rotates due to the operation of the motor I, the gear I arranged on the motor shaft I drives the gear II meshed with the gear I to rotate, the stirring rod I connected with the gear II starts to rotate along with the gear II, and the rolling bearing on the hard block I is a structural component for smoothly rotating the stirring rod I under the support of the hard block I. The temperature value in the preparation box can be watched at any time through the display.

Preferably, a second motor and a switch are installed on the preparation box, the second motor is electrically connected with the switch, a second motor shaft is installed on the second motor, a third gear is installed on the second motor shaft, a second rolling bearing is installed on the second hard block, the second stirring rod is connected with the second hard block through the second rolling bearing, a fourth gear is installed on the second stirring rod outside the preparation box, and the fourth gear is meshed with the three-phase gear. The second motor electrically connected with the switch can be started through the switch to work, the second motor shaft mounted on the second motor is enabled to rotate through the work of the second motor, the third gear mounted on the second motor shaft drives the fourth gear meshed with the three phases of the gears to rotate, the second stirring rod connected with the fourth gear starts to rotate along with the fourth gear, and the second rolling bearing on the second hard block is a structural component for enabling the second stirring rod to rotate smoothly under the support of the second hard block.

Preferably, a plurality of first stirring plates are uniformly arranged on a first stirring rod in the heating stirring tank, the length of the first stirring plates is sequentially increased from top to bottom on the first stirring rod, a plurality of openings are uniformly distributed on the first stirring plates, and a plurality of second stirring plates are uniformly arranged on a second stirring rod in the stirring tank. The design is through a plurality of stirring board one of uniform mounting on the stirring rod one can be under the rotation effect of stirring rod one with the stirring that the material in the heating agitator tank is smooth, the length of stirring board one top-down increases in proper order and stirs on board one evenly distributed has a plurality of trompil on the stirring rod one, the stirring effect of material in the heating agitator tank has been increased, and can be under the rotation effect of stirring rod two with the stirring that the material in the agitator tank is smooth through a plurality of stirring board two of uniform mounting on the stirring rod two.

Preferably, the first stirring rod and the first stirring plate are sleeved with protective layers. The protective layer on the stirring rod I and the stirring plate I can protect the stirring rod I and the stirring plate I, and when the stirring rod I rotates, the stirred material cannot collide with the stirring rod I and the stirring plate I, so that damage caused by collision is avoided.

As preferred, all be equipped with the spacing groove on the heating agitator tank and on the agitator tank, be connected with sealed piece on the spacing groove, the heating agitator tank is gone up and the agitator tank all can be dismantled with the valve through the spacing groove and be connected. The design can let the valve insert through the spacing groove on the heating agitator tank and on the agitator tank and receive spacingly like this, and the sealed piece of connecting on the spacing groove has then increased the sealed effect of heating agitator tank and agitator tank.

Preferably, the bottom surface of the preparation box is provided with the screen, the outer edge of the screen is provided with four inclined blocks, the inclined blocks correspond to the four side surfaces of the preparation box one by one, one side of each inclined block is connected with the preparation box, the other side of each inclined block is connected with the screen, and an angle between an inclined plane where each inclined block is located and a plane where the screen is located is an obtuse angle alpha. The design is that the screen installed on the bottom surface of the preparation box can receive materials from the upper part and the lower part, and the four inclined blocks which form an obtuse angle alpha with the screen on the outer edge of the screen can smoothly gather the materials falling from the upper part on the screen.

The invention has the beneficial effects that: the purpose of production at a temperature that cannot be burnt out can be achieved; the stirring effect of the materials in the preparation box can be improved; allowing the material to collect on the screen.

Drawings

FIG. 1 is a general layout of the present invention;

FIG. 2 is a diagram of the arrangement of the structures within the preparation tank of the present invention;

FIG. 3 is a layout view of a heating wire of the present invention;

FIG. 4 is a structural arrangement diagram of a first stir plate of the present invention;

FIG. 5 is a structural layout view of a second stir plate according to the present invention;

fig. 6 is a structural arrangement view of a section a-a in fig. 2.

In the figure: 1. the device comprises a preparation box, 2, a material inlet, 3, a liquid injection port, 4, a storage port, 5, a first hard block, 6, a second hard block, 7, a first stirring rod, 8, a second stirring rod, 9, a first rolling bearing, 10, a second rolling bearing, 11, a first motor, 12, a second motor, 13, a first motor shaft, 14, a second motor shaft, 15, a first gear, 16, a second gear, 17, a third gear, 18, a fourth gear, 19, a control panel, 20, a switch, 21, a display, 22, an outlet, 23, a material taking door, 24, a heating stirring tank, 25, a heating wire, 26, a valve, 27, a limiting groove, 28, a sealing block, 29, a stirring tank, 30, a first stirring plate, 31, a second stirring plate, 32, an opening, 33, a screen mesh, 34, an inclined block and a protective layer.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The scorch-resistant chemical cross-linked polyethylene cable insulation material comprises the following raw materials in parts by weight: 90-100 parts of polyethylene, 0.2-1.5 parts of antioxidant, 1-2.5 parts of cross-linking agent, 1-3 parts of auxiliary cross-linking agent, 1-3 parts of scorch resistant agent and 2-3 parts of compatibilizer. The polyethylene is a mixture of linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min, and the mass ratio of the polyethylene to the melt index of the polyethylene is 66-74: 6-13: 6-13; the antioxidant is a mixture of an antioxidant 300, an antioxidant DSTP and an antioxidant DLTP, and the mass ratio of the antioxidant to the antioxidant is 1: 0.5-0.8: 0.8-0.85; the cross-linking agent is dicumyl peroxide; the auxiliary crosslinking agent is benzoyl peroxide; the scorch inhibitor is N-cyclohexyl thiophthalimide; the compatibilizer is a modified styrene-ethylene-butylene-styrene block copolymer.

A preparation method of a scorch-resistant chemical crosslinked polyethylene cable insulating material is manufactured by adopting preparation equipment of the scorch-resistant chemical crosslinked polyethylene cable insulating material, and comprises the following steps:

the method comprises the following steps: weighing linear polyethylene with a melt index of 1.8-2g/10min, linear polyethylene with a melt index of 18.5-21.5g/10min and linear polyethylene with a melt index of 3.7-4.3g/10min according to the proportion, putting the three linear polyethylenes into a heating and stirring tank 24 for heating, enabling the three linear polyethylenes to reach a molten state when the temperature is up to 95 ℃, and stirring in the heating and stirring tank 24 to realize more comprehensive mixing to obtain a polyethylene mixture;

the method specifically comprises the following steps: linear polyethylene with a melt index of 1.9g/10min, linear polyethylene with a melt index of 20 g/10min and linear polyethylene with a melt index of 4g/10min were mixed in a weight ratio of 70: 10: 10 is weighed out by mass ratio and put into the heating and stirring tank 24 below the feeding port 2 from the feeding port 2 on the top surface of the preparation box 1, then the control board 19 on the preparation box 1 is operated to make the heating wire 25, the motor I11 and the display 21 which are electrically connected with the control board 19 start to work, the motor I11 works to make the motor shaft I13 on the motor I11 rotate, the gear II 16 on the stirring rod I7 in rolling connection with the hard block I5 of the feeding port 2 is meshed with the gear I15 on the motor shaft I13, the stirring rod I7 rotates under the driving of the motor shaft I13, a plurality of stirring plates I30 are uniformly arranged on the stirring rod I7, the length of the stirring plates I30 is sequentially increased by 1 from top to bottom on the stirring rod I7, a plurality of open holes 32 are uniformly distributed on the stirring plate I30, and the materials in the heating and stirring tank 24 can be smoothly blended under the stirring effect of the stirring plates I30, the heating wire 25 supplies heat to the heating and stirring tank 24, and when the temperature in the heating and stirring tank 24 reaches 95 ℃ as seen from the display 21, three molten fibers indicate that different linear polyethylenes can be smoothly fused, and a polyethylene mixture can be smoothly obtained.

Step two: weighing the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP according to the proportion, and injecting the antioxidant DSTP and the antioxidant DLTP into the stirring tank 29 for complete stirring and mixing work to obtain an antioxidant mixture;

the method specifically comprises the following steps: and manually operating a switch 20 on the preparation box 1 to enable a second motor 12 to be started to work, and mixing the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP in a ratio of 1: weighing out the components according to the mass ratio of 0.65:0.83, injecting the components from the liquid injection port 3 on the top surface of the preparation box 1, wherein the second motor 12 works to enable the second motor shaft 14 on the second motor 12 to rotate, the fourth gear 18 on the second stirring rod 8 connected with the second hard block 6 of the liquid injection port 3 is meshed with the third gear 17 on the second motor shaft 14, the second stirring rod 8 rotates under the driving of the second motor shaft 14, the second stirring rod 8 is uniformly provided with a plurality of stirring plates 31, and the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP can be completely mixed to smoothly obtain an antioxidant mixture.

Step three: after the mixture in the heating and stirring tank 24 is mixed for 20min, the polyethylene mixture and the antioxidant mixture fall into the bottom of the preparation box 1 together, and simultaneously dicumyl peroxide, benzoyl peroxide, N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene segmented copolymer are added, and the scorch-resistant chemical crosslinking polyethylene cable insulating material can be obtained through crosslinking reaction.

The method specifically comprises the following steps: after the mixing time in the heating and stirring tank 24 is 20min, the control panel 19 and the switch 20 on the preparation box 1 are manually operated, the motor I11, the heating electric wire 25, the display 21 and the motor II 12 stop working, then the dicumyl peroxide, the benzoyl peroxide, the N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene block copolymer are put in from the storage port 4, then the preparation material door 23 is manually controlled to lead the polyethylene mixture and the antioxidant mixture to fall into the bottom of the preparation box 1 together, the dicumyl peroxide, the benzoyl peroxide, the N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene block copolymer at the bottom of the preparation box 1 are mixed with the antioxidant mixture and the antioxidant mixture to generate chemical reaction under the crosslinking effect of the dicumyl peroxide, the scorch-resistant chemical cross-linked polyethylene cable insulating material is naturally generated.

As shown in figures 1, 2 and 3, the preparation device of the scorch-resistant chemical crosslinking polyethylene cable insulation material comprises a preparation box 1, a material inlet 2, a liquid inlet 3 and a material storage port 4 are arranged on the top surface of the preparation box 1, a first hard block 5 is arranged on the material inlet 2, a first stirring rod 7 is connected on the first hard block 5, a second hard block 6 is arranged on the liquid inlet 3, a second stirring rod 8 is connected on the second hard block 6, a heating stirring tank 24 and a stirring tank 29 are arranged in the preparation box 1, the heating stirring tank 24 is arranged below the material inlet 2, one end of the first stirring rod 7 is arranged in the heating stirring tank 24, a plurality of heating electric wires 25 are uniformly arranged on the heating stirring tank 24, the stirring tank 29 is arranged below the liquid inlet 3, one end of the stirring rod 8 is arranged in the stirring tank 29, the other end of the stirring rod 7 and the other end of the stirring rod 8 are both arranged outside the preparation box 1, the bottom of the heating stirring tank 24 and the bottom of the stirring tank 29 can be detachably connected with valves 26, an outlet 22 is arranged on the bottom surface of the preparation box 1, and a material taking door 23 is detachably connected to the outlet 22.

As shown in fig. 1 and 2, a first motor 11, a display 21 and a control board 19 are installed on a preparation box 1, a first motor shaft 13 is installed on the first motor 11, a first gear 15 is installed on the first motor shaft 13, a first rolling bearing 9 is installed on a first hard block 5, a first stirring rod 7 is connected with the first hard block 5 through the first rolling bearing 9, a second gear 16 is installed on the first stirring rod 7 outside the preparation box 1, the second gear 16 is meshed with the first gear 15, and the display 21 and the first motor 11 are both electrically connected with the control board 19. The preparation box 1 is provided with a second motor 12 and a switch 20, the second motor 12 is electrically connected with the switch 20, the second motor 12 is provided with a second motor shaft 14, the second motor shaft 14 is provided with a third gear 17, the second hard block 6 is provided with a second rolling bearing 10, the second stirring rod 8 is connected with the second hard block 6 through the second rolling bearing 10, the second stirring rod 8 outside the preparation box 1 is provided with a fourth gear 18, and the fourth gear 18 is meshed with the third gear 17.

As shown in fig. 2, 4 and 5, a plurality of first stirring plates 30 are uniformly installed on the first stirring rod 7 in the heating and stirring tank 24, the lengths of the first stirring plates 30 are sequentially increased from top to bottom on the first stirring rod 7, a plurality of openings 32 are uniformly distributed on the first stirring plates 30, and a plurality of second stirring plates 31 are uniformly installed on the second stirring rod 8 in the stirring tank 29. The first stirring rod 7 and the first stirring plate 30 are sleeved with protective layers 35. All be equipped with spacing groove 27 on heating agitator tank 24 and on agitator tank 29, be connected with sealed piece 28 on the spacing groove 27, heating agitator tank 24 is gone up and agitator tank 29 all can be dismantled with valve 26 through spacing groove 27 and be connected.

As shown in fig. 2 and 6, a screen 33 is installed on the bottom surface of the preparation tank 1, four inclined blocks 34 are arranged on the outer edge of the screen 33, the inclined blocks 34 correspond to the four side surfaces of the preparation tank 1 one by one, one surface of each inclined block 34 is connected with the preparation tank 1, the other surface of each inclined block 34 is connected with the screen 33, and an angle between an inclined surface where each inclined block 34 is located and a plane where the screen 33 is located is an obtuse angle α.

Firstly, linear polyethylene with the melt index of 1.9g/10min, linear polyethylene with the melt index of 20 g/10min and linear polyethylene with the melt index of 4g/10min are mixed in a proportion of 70: 10: 10 is weighed out by mass ratio and put into the heating and stirring tank 24 below the feeding port 2 from the feeding port 2 on the top surface of the preparation box 1, then the control board 19 on the preparation box 1 is operated to make the heating wire 25, the motor I11 and the display 21 which are electrically connected with the control board 19 start to work, the motor I11 works to make the motor shaft I13 on the motor I11 rotate, the gear II 16 on the stirring rod I7 in rolling connection with the hard block I5 of the feeding port 2 is meshed with the gear I15 on the motor shaft I13, the stirring rod I7 rotates under the driving of the motor shaft I13, a plurality of stirring plates I30 are uniformly arranged on the stirring rod I7, the length of the stirring plates I30 is sequentially increased by 1 from top to bottom on the stirring rod I7, a plurality of open holes 32 are uniformly distributed on the stirring plate I30, and the materials in the heating and stirring tank 24 can be smoothly blended under the stirring effect of the stirring plates I30, the heating wire 25 provides heat for the heating and stirring tank 24, when the temperature in the heating and stirring tank 24 reaches 95 ℃ from the display 21, three pieces of linear polyethylene with different melting indexes can be smoothly fused, a polyethylene mixture can be smoothly obtained, in the rotating process of the stirring rod I7, the protective layer 35 sleeved on the stirring rod I7 and the stirring plate I30 can prevent the linear polyethylene with the melting index of 20 g/10min and the linear polyethylene with the melting index of 4g/10min from colliding with the stirring rod I7 and the stirring plate I30 to be damaged, the protective layer 35 can be made of stainless steel, and the heating and stirring tank 24 is firm and practical.

And then manually operating a switch 20 on the preparation box 1 to enable a second motor 12 to be started to work, and mixing the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP in a ratio of 1: weighing out the components according to the mass ratio of 0.65:0.83, injecting the components from the liquid injection port 3 on the top surface of the preparation box 1, wherein the second motor 12 works to enable the second motor shaft 14 on the second motor 12 to rotate, the fourth gear 18 on the second stirring rod 8 in rolling connection with the second hard block 6 of the liquid injection port 3 is meshed with the third gear 17 on the second motor shaft 14, the second stirring rod 8 rotates under the driving of the second motor shaft 14, the second stirring rod 8 is uniformly provided with a plurality of second stirring plates 31, and the antioxidant 300, the antioxidant DSTP and the antioxidant DLTP can be completely mixed to smoothly obtain an antioxidant mixture.

After the mixing time in the heating and stirring tank 24 is 20min, the control panel 19 and the switch 20 on the preparation box 1 are manually operated, the motor I11, the heating electric wire 25, the display 21 and the motor II 12 stop working, then the dicumyl peroxide, the benzoyl peroxide, the N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene block copolymer are put in from the storage port 4, then the preparation material door 23 is manually controlled to lead the polyethylene mixture and the antioxidant mixture to fall into the bottom of the preparation box 1 together, the dicumyl peroxide, the benzoyl peroxide, the N-cyclohexyl thiophthalimide and the modified styrene-ethylene-butylene-styrene block copolymer at the bottom of the preparation box 1 are mixed with the antioxidant mixture and the antioxidant mixture to generate chemical reaction under the crosslinking effect of the dicumyl peroxide, the scorch-resistant chemical cross-linked polyethylene cable insulating material is naturally generated.

And finally, adding the generated material of the scorch-resistant chemical crosslinking polyethylene cable insulating material into a double-screw extruder for extrusion granulation, wherein the extrusion temperature is 120 ℃, the extrusion speed is 100rpm/min, so as to obtain an insulating material premix, mixing and stirring the obtained insulating material premix and the diisophenylpropane peroxide in a container at a constant speed, wherein the mixing and stirring temperature is 70 ℃, the mixing time is 40min, the diisophenylpropane peroxide is completely absorbed into particles, and then putting the particles into a heat-insulating bin for heat preservation for 24h, so as to obtain the scorch-resistant chemical crosslinking polyethylene cable insulating material.