High-toughness electrical conduit and preparation method thereof

Abstract

The invention discloses a high-toughness electrical conduit and a preparation method thereof. The high-toughness electrical conduit is prepared from the following raw materials in parts by weight through co-extrusion: 80-120 parts of five-type powder, 10-20 parts of light calcium carbonate, 8-15 parts of chlorinated polyethylene, 2-4.0 parts of a stabilizer, 3-6 parts of titanium dioxide, 0.3-0.8 part of PE wax, 0.1-0.5 part of stearic acid, 1.5-3.5 parts of heavy calcium carbonate, 0.4-1 part of a silicon substrate and 2-8 parts of glass fibers. The preparation process comprises the following steps: carrying out surface modification treatment on light calcium carbonate to obtain a surface modified light calcium carbonate mixture; carrying out hot mixing treatment, namely adding the five-type powder into a high-speed mixer, heating and stirring to 45 DEG C, adding a stabilizer, heating to 70-85 DEG C, adding surface modified light calcium carbonate, heating to 110-125 DEG C, adding chlorinated polyethylene, keeping the temperature, stirring for 2-5 minutes, cooling to 80-90 DEG C, adding 1 / 4 of stearic acid, PE wax and titanium dioxide, mixing to obtain a hot mixture, and carrying out hot mixing for 2-3 hours; and carrying out extrusion molding to obtain the electrical conduit. The toughness and the impact strength of the sleeve are improved, and the flame retardant property and the oxidation resistance of the sleeve are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic pipe technology, in particular to a high-toughness electrical conduit and a preparation method thereof. BACKGROUND

[0002] The electrical conduit is a commonly used wire protection pipe material in building decoration wiring. The power conduit plays a role in protecting the cable and is commonly used in places where the cable needs to be laid hidden. The conduit is generally used in normal indoor environments and in places with high temperature, dust, vibration and fire hazards, and can also be used in humid places. The existing electrical conduit is mostly polyvinyl chloride pipe. However, due to poor dispersion during processing, the electrical conduit sheath will turn white when bent during use, has greater brittleness under low temperature conditions, and is prone to rupture after being pressed or impacted. The conduit is prone to breakage when bent for a long time, has poor flexibility, poor general compression resistance, is brittle, and has a short service life. Therefore, the flexibility of the existing electrical conduit needs to be improved, and the contradiction between rigidity and toughness cannot be effectively balanced. SUMMARY

[0003] The present application relates to the field of plastic pipe technology, in particular to a high-toughness electrical conduit and a preparation method thereof. According to one aspect of the present application, a high-toughness electrical conduit is provided, which is co-extruded from the following raw materials by weight: five-type powder 80-120 parts, light calcium 10-20 parts, chlorinated polyethylene 8-15 parts, stabilizer 2-4.0 parts, titanium white 3-6 parts, PE wax 0.3-0.8 parts, stearic acid 0.1-0.5 parts, heavy calcium 1.5-3.5 parts, silicon base 0.4-1 parts, and glass fiber 2-8 parts.

[0004] The high-toughness electrical conduit is co-extruded from the following raw materials by weight: five-type powder 100 parts, light calcium 15 parts, chlorinated polyethylene 12 parts, stabilizer 3 parts, titanium white 5 parts, PE wax 0.5 parts, stearic acid 0.4 parts, heavy calcium 2.5 parts, silicon base 0.8 parts, and glass fiber 5 parts.

[0005] Further preferably, the five type powder is PVC SG5 resin, which has good toughness as the base material; the chlorine content of the chlorinated polyethylene is 30-36%, and the chlorinated polyethylene, referred to as CPE, is a saturated polymer material, which has good toughening effect and good flame retardant performance as an impact modifier, and is mixed with light calcium, hard calcium and silicon-based to fully cross-link and couple to form a sleeve that can effectively absorb impact energy, improve the interfacial bonding force, improve the toughness and impact strength, and improve the flowability of the mixture during processing; the light calcium, also known as light calcium carbonate, has a relative density of 2.7-2.9 g / cm 3 , which not only reduces the production cost, but also improves the toughness of the sleeve and keeps the size of the sleeve stable; the heavy calcium, also known as heavy calcium carbonate, is also a filler, which not only reduces the production cost, but also improves the hardness, stiffness and shrinkage of the sleeve; the silicon-based is silane coupling agent G-570, also known as gamma-methacryloxypropyl trimethoxysilane; the silicon-based is a surface modifier, which is mixed with light calcium, heavy calcium, stearic acid and stripping fiber to modify the surface of light calcium and improve the interfacial bonding force between inorganic fillers (light calcium and hard calcium) and organic PVC SG5 resin; PE wax, also known as high molecular wax, is referred to as polyethylene wax, which can be used as a dispersant and lubricant, has internal and external lubrication, improves the melt flowability, promotes plasticization, enhances the plasticization degree of the sleeve, and improves the toughness and surface smoothness of the sleeve; the glass fiber is an alkali-free chopped fiber with a length of 0.5-3 mm and a diameter of 20-80 μm; the glass fiber forms a stable covalent bond network with light calcium and silicon-based, which not only enhances the tensile strength of the electrical sleeve, reduces the weight of the sleeve, but also enhances the impact resistance and pressure resistance of the sleeve; Further preferably, the titanium white powder is red stone type titanium white powder, and the rutile type (R type) TiO2 is a high-quality white pigment and ultraviolet shielding agent (anti-aging agent) that provides high whiteness, hiding power and smooth surface and enhances the aesthetic performance, while forming a protective layer to resist moisture, acid and alkali corrosion factors, has excellent weather resistance and chemical stability, can improve the comprehensive performance and reliability of the sleeve, resist ultraviolet rays, ozone and extreme temperature changes, prevent the sleeve from yellowing, cracking or embrittlement, prolong the service life in outdoor environment, and optimize the impact resistance, pressure resistance and wear resistance of the sleeve, reduce the risk of physical damage during installation or use; maintain the stability of the sleeve structure under high temperature or humid conditions, and avoid material degradation to reduce the insulation performance; The stabilizer is a calcium-zinc stabilizer, which is a solid calcium-zinc stabilizer or a liquid calcium-zinc stabilizer. The calcium-zinc stabilizer can reduce the frictional resistance in the processing process, promote the uniform dispersion of fillers (such as light calcium and heavy calcium), improve the surface finish of the sleeve, prevent the degradation, discoloration and embrittlement of the PVC SG5 resin sleeve due to high-temperature (160-200℃) extrusion processing (high-temperature shearing) and use, and improve the impact resistance and wear resistance of the sleeve.

[0006] Preferably, the particle size of the solid calcium-zinc stabilizer is less than 1 μm.

[0007] According to another aspect of the present application, the present application provides a preparation method of a high-toughness electrical sleeve, which comprises the following steps: Step 1: the following raw materials are weighed by weight parts: 80-120 parts of five-type powder, 10-20 parts of light calcium, 8-15 parts of chlorinated polyethylene, 2-4.0 parts of stabilizer, 3-6 parts of titanium white, 0.3-0.8 parts of PE wax, 0.1-0.5 parts of stearic acid, 1.5-3.5 parts of heavy calcium, 0.4-1 parts of silicon-based, and 2-8 parts of glass fiber; Step 2: the surface of the light calcium is modified to obtain a surface-modified light calcium mixture; Step 3: hot mixing treatment, the five-type powder is added to a high-speed mixer and stirred at an elevated temperature of 45℃, then the stabilizer is added and stirred at an elevated temperature, the surface-modified light calcium is added and stirred at an elevated temperature of 70-85℃, the chlorinated polyethylene is added and stirred at an elevated temperature of 110-125℃, then the temperature is lowered to 80-90℃ after 2-5 minutes of heat preservation and stirring, and then 1 / 4 of the stearic acid, the PE wax and the titanium white are sequentially added and stirred for 5-15 minutes to obtain a hot mixture; Step 4: extrusion molding, the hot mixture is put into an extruder to obtain a high-toughness electrical sleeve, and the temperature of the feeding section is 150-160℃, the temperature of the compression section is 160-170℃, the temperature of the homogenization treatment section is 165-185℃, and the temperature of the die head is 170-200℃.

[0008] Preferably, in step 3, the stirring speed is 1000-2500 rad / min; and the extrusion molding is performed.

[0009] Preferably, the surface modification of the light calcium comprises the following steps: Step 21: the glass fiber is added to deionized water for cleaning and hot air drying, then the glass fiber is immersed in a mixed solution of ammonia water, hydrogen peroxide and distilled water for dispersion, and ultrasonic vibration stirring is performed, 4 / 5 of the silicon-based is added to the mixed solution, then the mixture is continuously stirred for 20-40 minutes, and then solid-liquid separation is performed, followed by cold air blowing to obtain clean glass fiber for use; Step 22, after the light calcium and heavy calcium are premixed uniformly, they are added into anhydrous ethanol and stirred slowly until the light calcium is completely dispersed in the anhydrous ethanol, then 1 / 5 of the silicon base is added and mixed uniformly; Step 23, the light calcium mixture is added with heavy calcium, clean stripping fiber and 3 / 4 of stearic acid, and is mixed and stirred under ultrasonic vibration in a vacuum environment, and is gradually heated to 70-85 DEG C at the same time, and is continuously stirred under ultrasonic vibration for 5-10 minutes under vacuum and heat preservation, and is cooled to room temperature, to obtain a modified light calcium mixture; Step 24, the modified light calcium mixture is put into an airflow crusher and is crushed to 1-10 microns, to obtain surface-modified light calcium, and the airflow light calcium is broken instantaneously to form an active surface Ca 2+ In-situ bonding is realized in the particle crushing moment, so that Ca-O-Si, Si-O-Si and other related covalent bond networks are formed between the silicon base and the glass fiber, so that the light calcium has a high active surface.

[0010] Preferably, the ultrasonic vibration stirring frequency is 2.45 GHz, and the power is 500-800 W.

[0011] Preferably, the volume ratio of the ammonia water, hydrogen peroxide and distilled water is 1: (3-6) : (15-30).

[0012] As described above, the present application has the following technical effects: The high-toughness electrical bushing has both impact resistance and compression resistance, and effectively improves the toughness, impact strength and surface smoothness of the bushing, shows excellent rigidity and outstanding impact resistance, realizes the performance breakthrough of the PVC electrical bushing in rigidity, toughness and stability, enhances the flame retardation and oxidation resistance of the bushing, greatly prolongs the service life of the electrical bushing, and effectively reduces the preparation and processing cost of the electrical bushing. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a preparation process flow diagram of a high-toughness electrical bushing. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the present application clearer, the following preferred embodiments are described with reference to the drawings. However, it should be noted that many details in the description are only to make the reader have a thorough understanding of one or more aspects of the present application, and the aspects of the present application can be realized without these specific details.

[0015] Example 1: A high-toughness electrical bushing according to the present application, the high-toughness electrical bushing is co-extruded from the following raw materials by weight: five type powder 80 parts, light calcium 10 parts, chlorinated polyethylene 15 parts, stabilizer 4.0 parts, titanium white powder 6 parts, PE wax 0.8 parts, stearic acid 0.5 parts, heavy calcium 3.5 parts, silicon base 1 part, glass fiber 8 parts; the chlorine content in the chlorinated polyethylene is 30%-36%; the glass fiber is alkali-free chopped fiber, the length is 0.5mm, and the diameter is 20μm; The titanium white powder is red stone type titanium white powder, the stabilizer is calcium zinc stabilizer, and the calcium zinc stabilizer is solid calcium zinc stabilizer; the particle size of the solid calcium zinc stabilizer is less than 1μm.

[0016] As Figure 1 shown, according to another aspect of the present application, the present embodiment provides a preparation method of a high-toughness electrical bushing, the preparation method comprising the following steps: Step 1, the following raw materials by weight are weighed by weight: five type powder 80 parts, light calcium 10 parts, chlorinated polyethylene 15 parts, stabilizer 4.0 parts, titanium white powder 6 parts, PE wax 0.8 parts, stearic acid 0.5 parts, heavy calcium 3.5 parts, silicon base 1 part, glass fiber 8 parts, wherein the stearic acid is divided into 4 equal parts, and the silicon base is divided into 5 equal parts; Step 2, the surface of the light calcium is modified to obtain a surface modified light calcium mixture; in the present embodiment, the surface modification treatment of the light calcium comprises the following steps: Step 21; the glass fiber is washed in deionized water, hot air dried, then immersed in a mixed solution of ammonia, hydrogen peroxide and distilled water for dispersion, and ultrasonic vibration stirring is maintained, 4 / 5 of the silicon base is added to the mixed solution, then the mixture is continuously stirred for 20min, then solid-liquid separation is carried out, and cold air blowing is carried out to obtain clean glass fiber for use, wherein the volume ratio of the ammonia, hydrogen peroxide and distilled water is 1:3:15; Step 22, after the light calcium and heavy calcium are uniformly premixed, they are added to anhydrous ethanol and uniformly stirred, then 1 / 5 of the silicon base is added after the light calcium is completely dispersed in the anhydrous ethanol to mix uniformly; Step 23, the heavy calcium, clean stripping fiber and 3 / 4 of the stearic acid are added to the light calcium mixture of the above step 22 for ultrasonic vibration stirring and mixing in a vacuum environment, and gradually heated to 70℃ at the same time, then ultrasonic vibration stirring is continuously carried out for 5-10min under vacuum and heat preservation conditions, and cooled to room temperature to obtain a modified light calcium mixture, wherein the frequency of ultrasonic vibration stirring and mixing is 2.45GHz, and the power is 500-800W; Step 24, the modified light calcium mixture is put into an airflow pulverizer for pulverization to 1-10μm to obtain surface modified light calcium; Step 3, hot mixing treatment: Add type 5 powder to a high-speed mixer and heat and stir to 45°C. Add stabilizer and heat and stir together. When the temperature reaches 70°C, add surface-modified light calcium carbonate and stir. When the temperature reaches 110°C, add chlorinated polyethylene. Keep warm and stir for 2-5 minutes, then cool down to 80°C. Then add 1 / 4 of stearic acid, PE wax, and titanium dioxide in sequence and stir for 5-15 minutes to obtain hot mix. The stirring speed is 1000 rad / min. Step 4, extrusion molding: The hot mixture is fed into the extruder and extruded to obtain a high-toughness electrical conduit. During extrusion, the temperature of the feeding section is 150℃, the temperature of the compression section is 160℃, the temperature of the homogenization section is 165℃, and the temperature of the die head is 170℃.

[0017] Example 2, according to the present invention, a high-toughness electrical conduit is co-extruded from the following raw materials in parts by weight: 100 parts of type 5 powder, 15 parts of light calcium carbonate, 12 parts of chlorinated polyethylene, 3 parts of stabilizer, 5 parts of titanium dioxide, 0.5 parts of PE wax, 0.4 parts of stearic acid, 2.5 parts of heavy calcium carbonate, 0.8 parts of silicon-based resin, and 5 parts of glass fiber; the type 5 powder is PVC SG5 resin, and the chlorine content in the chlorinated polyethylene is 34%; the glass fiber is alkali-free short-cut fiber with a length of 1.2 mm and a diameter of 60 μm; the titanium dioxide is red stone titanium dioxide, and the stabilizer is a calcium-zinc stabilizer, which is a solid calcium-zinc stabilizer; the particle size of the solid calcium-zinc stabilizer is less than 1 μm.

[0018] like Figure 1 As shown, according to another aspect of the present invention, this embodiment provides a method for preparing a high-toughness electrical conduit, the method comprising the following steps: Step 1: Weigh the following raw materials by weight: 100 parts of type 5 powder, 15 parts of light calcium carbonate, 12 parts of chlorinated polyethylene, 3 parts of stabilizer, 5 parts of titanium dioxide, 0.5 parts of PE wax, 0.4 parts of stearic acid, 2.5 parts of heavy calcium carbonate, 0.8 parts of silicon-based materials, and 5 parts of glass fiber. Among these, the stearic acid is divided into 4 equal parts, and the silicon-based materials are divided into 5 equal parts. Step 2 involves surface modification treatment of the light calcium carbonate to obtain a surface-modified light calcium carbonate mixture. In this embodiment of the invention, the surface modification treatment of the light calcium carbonate includes the following steps: Step 21: After washing the glass fiber in deionized water and drying it with hot air, the glass fiber is then immersed in a mixed solution of ammonia, hydrogen peroxide and distilled water for dispersion, and ultrasonic vibration is maintained while stirring and mixing. 4 / 5 of the silicon-based material is added to the mixed solution, and then mixing is continued for 30 minutes before solid-liquid separation. After drying with cold air, clean glass fiber is obtained for later use. The volume ratio of ammonia, hydrogen peroxide and distilled water is 1:5:25. Step 22, after the light calcium and heavy calcium are uniformly premixed, they are added into anhydrous ethanol and stirred slowly until the light calcium is completely dispersed in the anhydrous ethanol, and then 1 / 5 of the silicon base is added and mixed uniformly; Step 23, the light calcium mixture of step 22 is added with heavy calcium, clean stripping fiber, and 3 / 4 of stearic acid, and is mixed and stirred under ultrasonic vibration in a vacuum environment, and is gradually heated to 80℃ at the same time, and is continuously mixed and stirred under ultrasonic vibration for 5-10 minutes under vacuum and heat preservation, and is then cooled to room temperature, to obtain a modified light calcium mixture, wherein the frequency of the ultrasonic vibration mixing is 2.45 GHz, and the power is 500-800 W; Step 24, the modified light calcium mixture is put into an airflow pulverizer and is pulverized to 1-10 μm, to obtain surface-modified light calcium; Step 3, hot mixing treatment, the five-type powder is added into a high-speed mixer and is stirred and mixed while being heated to 45℃, and then a stabilizer is added and stirred and mixed while being heated, and then the surface-modified light calcium is added and stirred and mixed while being heated to 75℃, and then the chlorinated polyethylene is added and stirred and mixed while being heated to 115℃, and then the temperature is lowered to 85℃ after being stirred and mixed for 2-5 minutes, and then 1 / 4 of the stearic acid, the PE wax, and the titanium white are sequentially added and mixed for 10 minutes, to obtain a hot mixture, wherein the stirring and mixing speed is 2000 rad / min; Step 4, extrusion molding, the hot mixture is put into an extruder and is extruded and molded, to obtain a high-toughness electrical sleeve, wherein the feeding section temperature is 155℃, the compression section temperature is 165℃, the homogenization treatment section temperature is 180℃, and the die temperature is 185℃.

[0019] Example 3: According to another aspect of the present application, the present embodiment provides a preparation method of a high-toughness electrical sleeve, which comprises the following steps: The titanium white is red-stone type titanium white, the stabilizer is a calcium-zinc stabilizer, and the calcium-zinc stabilizer is a solid calcium-zinc stabilizer; the particle size of the solid calcium-zinc stabilizer is less than 1 μm.

[0020] As Figure 1 shown, according to another aspect of the present application, the present embodiment provides a preparation method of a high-toughness electrical sleeve, which comprises the following steps: Step 1, the following weight parts of raw materials are weighed by weight parts: 120 parts of five type powder, 20 parts of light calcium, 8 parts of chlorinated polyethylene, 2 parts of stabilizer, 3 parts of titanium white, 0.3 parts of PE wax, 0.1 parts of stearic acid, 1.5 parts of heavy calcium, 0.4 parts of silicon base, 2 parts of glass fiber, wherein the stearic acid is divided into 4 equal parts, and the silicon base is divided into 5 equal parts; Step 2, the surface of the light calcium is modified and treated to obtain a surface modified light calcium mixture; in the embodiment of the present application, the surface modification treatment of the light calcium includes the following steps: Step 21, the glass fiber is washed by adding it into deionized water, hot air dried, then immersed in a mixed solution of ammonia, hydrogen peroxide and distilled water for dispersion, and ultrasonic vibration stirring is maintained, 4 / 5 of the silicon base is added to the mixed solution, then the mixing is continued for 40 minutes, then solid-liquid separation is carried out, and cold air blowing is carried out to obtain clean glass fiber for use, wherein the volume ratio of the ammonia, hydrogen peroxide and distilled water is 1:6:30; Step 22, after the light calcium and heavy calcium are uniformly premixed, they are added to anhydrous ethanol and uniformly stirred, 1 / 5 of the silicon base is added after the light calcium is completely dispersed in the anhydrous ethanol, and the mixture is uniformly mixed; Step 23, the light calcium mixture of the above step 22 is added with heavy calcium, clean stripping fiber and 3 / 4 of stearic acid, and ultrasonic vibration stirring mixing is carried out in a vacuum environment, and at the same time, the temperature is gradually increased to 85℃, and after 5-10 minutes of ultrasonic vibration stirring mixing under vacuum and heat preservation, the temperature is cooled to room temperature, to obtain a modified light calcium mixture, wherein the frequency of ultrasonic vibration stirring mixing is 2.45GHz, and the power is 500-800W; Step 24, the modified light calcium mixture is put into an airflow pulverizer to be pulverized to 1-10μm to obtain surface modified light calcium; Step 3, hot mixing treatment, the five type powder is added to a high-speed mixer, and when the temperature is increased to 45℃, the stabilizer is added for temperature stirring and mixing, when the temperature is increased to 85℃, the surface modified light calcium is added for stirring and mixing, when the temperature is increased to 125℃, the chlorinated polyethylene is added, and after heat preservation and stirring for 2-5 minutes, the temperature is decreased to 90℃, then 1 / 4 of the stearic acid, PE wax and titanium white are sequentially added for mixing and stirring for 5-15 minutes to obtain a hot mixture, wherein the stirring and mixing speed is 2500rad / min; Step 4, extrusion molding, the hot mixture is put into an extruder for extrusion molding to obtain a high-toughness electrical sleeve, and when extruding, the temperature of the feeding section is 160℃, the temperature of the compression section is 170℃, the temperature of the homogenization treatment section is 185℃, and the temperature of the die head is 200℃.

[0021] Example 4: A high-toughness electrical sleeve according to the present application, the high-toughness electrical sleeve is co-extruded from the following raw materials by weight: five type powder 90 parts, light calcium 10 parts, chlorinated polyethylene 10 parts, stabilizer 4.0 parts, titanium white powder 6 parts, PE wax 0.6 parts, stearic acid 2 parts, heavy calcium 3.5 parts, silicon-based 1 part, glass fiber 8 parts; the chlorine content in the chlorinated polyethylene is 35%; the glass fiber is alkali-free chopped fiber, the length is 1.5 mm, and the diameter is 70 μm; The titanium white powder is red stone type titanium white powder, the stabilizer is calcium zinc stabilizer, the calcium zinc stabilizer is liquid calcium zinc stabilizer, the liquid calcium zinc stabilizer can effectively improve the electrical insulation performance of the electrical sleeve, prolong the thermal stability and service life of the electrical sleeve; promote the uniform melting and flow of PVC SG5 resin, and improve the surface finish of the sleeve.

[0022] As Figure 1 shown, according to another aspect of the present application, the present embodiment provides a preparation method of a high-toughness electrical sleeve, the preparation method comprises the following steps: Step 1, the following raw materials by weight are weighed by weight: five type powder 80 parts, light calcium 10 parts, chlorinated polyethylene 15 parts, stabilizer 4.0 parts, titanium white powder 6 parts, PE wax 0.8 parts, stearic acid 0.5 parts, heavy calcium 3.5 parts, silicon-based 1 part, glass fiber 8 parts, wherein the stearic acid is divided into 4 equal parts, and the silicon-based is divided into 5 equal parts; Step 2, the surface of the light calcium is modified to obtain a surface modified light calcium mixture; in the present embodiment, the surface modification of the light calcium comprises the following steps: Step 21; the glass fiber is washed in deionized water, hot air dried, then immersed in a mixed solution of ammonia, hydrogen peroxide and distilled water for dispersion, and ultrasonic vibration stirring is maintained, 3 / 5 of the silicon-based is added to the mixed solution, then the mixture is continuously stirred for 30 min, then solid-liquid separation is carried out, and cold air blowing is carried out to obtain clean glass fiber for use, wherein the volume ratio of the ammonia, hydrogen peroxide and distilled water is 1:4:24; Step 22, after the light calcium and heavy calcium are uniformly premixed, they are added to anhydrous ethanol and uniformly stirred, and after the light calcium is completely dispersed in the anhydrous ethanol, 2 / 5 of the silicon-based is added for uniform mixing; Step 23, 3 / 4 of the stearic acid, clean stripping fiber and heavy calcium are added to the light calcium mixture of step 22, and ultrasonic vibration stirring is carried out in a vacuum environment, and at the same time, the temperature is gradually increased to 70℃, and then the ultrasonic vibration stirring is continued for 5-10 minutes under vacuum and heat preservation conditions, and then cooled to room temperature to obtain a modified light calcium mixture, wherein the frequency of ultrasonic vibration stirring is 2.45 GHz, and the power is 500-800 W; Step 24, the modified light calcium mixture is put into an airflow pulverizer to be pulverized to 1-10 microns, to obtain surface modified light calcium; Step 3, hot mixing treatment, the five types of powder are added into a high-speed mixer to be heated and stirred until 45 DEG C, then the stabilizer is added to be heated and stirred together, when heated to 75 DEG C, the surface modified light calcium is added to be stirred, then heated to 120 DEG C, the chlorinated polyethylene is added, heated and stirred for 2-5 minutes, then cooled to 85 DEG C, then 1 / 4 of the stearic acid, PE wax and titanium white are added to be mixed and stirred for 5-15 minutes, to obtain hot mixing material, wherein the stirring speed is 1800 rad / min; Step 4, extrusion molding, the hot mixing material is put into an extruder to be extruded and molded, to obtain high toughness electrical sleeve, when extruded, the feeding section temperature is 156 DEG C, the compression section temperature is 165 DEG C, the homogenization treatment section temperature is 175 DEG C, and the die temperature is 190 DEG C.

[0023] The electrical sleeve prepared by the preparation method of the embodiments 1-4 of the present application is subjected to performance determination according to JG / T3050 1998, and the test results are shown in Table 1: The high toughness electrical sleeve of the present application meets the technical index requirements of JG / T3050 1998, by mixing light calcium, hard calcium and silicon-based materials in the PVC SG5 resin system and uniformly dispersing them in the PVC SG5 resin system to fully crosslink and couple, the prepared sleeve can effectively absorb impact energy, effectively improve the interfacial bonding force between the PVC SG5 and the surface modified light calcium, improve the toughness and impact strength of the sleeve, and well balance the impact performance and compression resistance of the sleeve, showing excellent rigidity and outstanding impact resistance, not only improving the toughness and surface smoothness of the sleeve, but also enhancing the flame retardance and oxidation resistance of the sleeve, greatly prolonging the service life of the electrical sleeve.

[0024] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high toughness electrical bushing characterized by: The high-toughness electrical conduit is co-extruded from the following raw materials in parts by weight: 80-120 parts of type 5 powder, 10-20 parts of light calcium carbonate, 8-15 parts of chlorinated polyethylene, 2-4.0 parts of stabilizer, 3-6 parts of titanium dioxide, 0.3-0.8 parts of PE wax, 0.1-0.5 parts of stearic acid, 1.5-3.5 parts of heavy calcium carbonate, 0.4-1 parts of silicon-based, and 2-8 parts of glass fiber.

2. A high toughness electrical bushing according to claim 1, characterized in that: The high-toughness electrical conduit is co-extruded from the following raw materials in parts by weight: 100 parts of type 5 powder, 15 parts of light calcium carbonate, 12 parts of chlorinated polyethylene, 3 parts of stabilizer, 5 parts of titanium dioxide, 0.5 parts of PE wax, 0.4 parts of stearic acid, 2.5 parts of heavy calcium carbonate, 0.8 parts of silicon-based materials, and 5 parts of glass fiber.

3. A high toughness electrical bushing according to claim 1 or 2, characterized in that: The type 5 powder is PVC SG5 resin, the chlorine content in the chlorinated polyethylene is 30%-36%, and the glass fiber is alkali-free short-cut fiber with a length of 0.5-3mm and a diameter of 20-80μm.

4. A high toughness electrical bushing according to claim 1 or 2, characterized in that: The titanium dioxide is redstone titanium dioxide, and the stabilizer is a calcium-zinc stabilizer, which can be a solid calcium-zinc stabilizer or a liquid calcium-zinc stabilizer.

5. The high-toughness electrical conduit according to claim 4, characterized in that: The particle size of the solid calcium-zinc stabilizer is less than 1 μm.

6. The method for preparing a high-toughness electrical conduit according to claim 1 or 2, characterized in that: The preparation method includes the following steps: Step 1: Weigh the following raw materials by weight: 80-120 parts of type 5 powder, 10-20 parts of light calcium carbonate, 8-15 parts of chlorinated polyethylene, 2-4.0 parts of stabilizer, 3-6 parts of titanium dioxide, 0.3-0.8 parts of PE wax, 0.1-0.5 parts of stearic acid, 1.5-3.5 parts of heavy calcium carbonate, 0.4-1 parts of silicon-based material, and 2-8 parts of glass fiber. The stearic acid is divided into 4 equal parts and the silicon-based material is divided into 5 equal parts. Step 2: Surface modification treatment of light calcium carbonate to obtain a surface-modified light calcium carbonate mixture; Step 3, hot mixing treatment: Add type 5 powder to a high-speed mixer and heat and stir to 45°C. Add stabilizer and heat and stir together. When the temperature reaches 70-85°C, add surface-modified light calcium carbonate and stir. When the temperature reaches 110-125°C, add chlorinated polyethylene. Keep warm and stir for 2-5 minutes, then cool down to 80-90°C. Then add 1 / 4 of stearic acid, PE wax, and titanium dioxide in sequence and stir for 5-15 minutes to obtain the hot mix. Step 4, extrusion molding: The hot mixture is fed into the extruder and extruded to obtain a high-toughness electrical conduit. During extrusion, the temperature of the feeding section is 150-160℃, the temperature of the compression section is 160-170℃, the temperature of the homogenization section is 165-185℃, and the temperature of the die head is 170-200℃.

7. The method for preparing a high-toughness electrical conduit according to claim 6, characterized in that: In step 3, the mixing speed is 1000-2500 rad / min; extrusion molding.

8. The method for preparing a high-toughness electrical conduit according to claim 5, characterized in that: The surface modification treatment of light calcium carbonate includes the following steps: Step 21: After washing the glass fiber in deionized water and drying it with hot air, immerse the glass fiber in a mixed solution of ammonia, hydrogen peroxide and distilled water for dispersion and maintain ultrasonic vibration to stir and mix. Add some silicon to the mixed solution and continue mixing for 20-40 minutes. Then perform solid-liquid separation and dry it with cold air to obtain clean glass fiber for later use. Step 22: After premixing the light calcium carbonate and heavy calcium carbonate evenly, add them to anhydrous ethanol and stir slowly until the light calcium carbonate is completely dispersed in the anhydrous ethanol. Then mix the remaining silicon-based components evenly. Step 23: Add heavy calcium carbonate, clean stripped fiber and 3 / 4 of stearic acid to the light calcium carbonate mixture and mix them under vacuum with ultrasonic vibration. At the same time, gradually raise the temperature to 70-85℃ and continue to mix under vacuum with ultrasonic vibration for 5-10 minutes. Then cool to room temperature to obtain the modified light calcium carbonate mixture. Step 24: The modified light calcium carbonate mixture is placed in an air jet mill and pulverized to 1-10 μm to obtain surface-modified light calcium carbonate.

9. The method for preparing a high-toughness electrical conduit according to claim 7, characterized in that: The ultrasonic vibration stirring and mixing frequency is 2.45 GHz, and the power is 500-800 W.

10. The method for preparing a high-toughness electrical conduit according to claim 7, characterized in that: The volume ratio of ammonia, hydrogen peroxide and distilled water is 1:(3-6):(15-30).

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