Aging-resistant cable protection pipe and preparation method thereof

Abstract

The application relates to the technical field of cable protection pipes, and discloses an anti-aging cable protection pipe and a preparation method thereof. The anti-aging cable protection pipe comprises the following components by weight: 80-100 parts of polypropylene, 5-7 parts of modified carbon black, 15-20 parts of polyolefin elastomer, 20-30 parts of a flame retardant, 2-5 parts of a compatibilizer and 0.5-1.5 parts of an antioxidant. The modified carbon black is obtained by modifying carbon black with poly(2-hydroxyethyl acrylate); and the modified carbon black comprises the following components by weight: 80-100 parts of carbon black, 10-12 parts of 2-hydroxyethyl acrylate and 0.2-0.3 parts of an initiator. The above technical scheme solves the problem of poor anti-aging property of the cable protection pipe in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable protection pipe, in particular, it relates to a kind of anti-aging cable protection pipe and preparation method thereof. BACKGROUND

[0002] Cable protection pipe is the key supporting pipe material in the field of power transmission, communication engineering, etc., the core role is to protect cable from mechanical damage, chemical corrosion and environmental erosion, is widely used in underground laying, outdoor exposure, wet soil and other complex scenes, long-term face ultraviolet radiation, high-low temperature cycle, wet and hot alternation and other harsh environment continuous test.

[0003] However, the cable protection pipe in the prior art generally has the problem of insufficient anti-aging performance, which leads to the failure phenomena such as embrittlement cracking, mechanical strength attenuation and sealing performance degradation of the pipe material during service, which not only increases the risk of short circuit, communication interruption and other risks, but also increases the maintenance cost and operation difficulty in the later period. Therefore, it is necessary to propose a cable protection pipe with excellent anti-aging performance and a preparation method thereof. SUMMARY

[0004] The present application proposes a kind of anti-aging cable protection pipe and preparation method thereof, solve the problem of poor anti-aging of cable protection pipe in the prior art.

[0005] The technical scheme of the present application is as follows:

[0006] The present application proposes a kind of anti-aging cable protection pipe, which comprises the following components by weight: polypropylene 80-100 parts, modified carbon black 5-7 parts, polyolefin elastomer 15-20 parts, flame retardant 20-30 parts, compatibilizer 2-5 parts, antioxidant 0.5-1.5 parts;

[0007] The modified carbon black is obtained by modifying carbon black with poly(2-hydroxyethyl acrylate);

[0008] The modified carbon black comprises the following components by weight: carbon black 80-100 parts, 2-hydroxyethyl acrylate 10-12 parts, initiator 0.2-0.3 parts.

[0009] As a further technical scheme, the mass ratio of carbon black to 2-hydroxyethyl acrylate is 8-10:1, preferably 9:1.

[0010] As a further technical scheme, the preparation method of the modified carbon black comprises the following steps:

[0011] S1, disperse carbon black and sodium dodecyl sulfate in water to obtain a carbon black water dispersion;

[0012] S2, after the 2-hydroxyethyl acrylate, hexadecane, sodium dodecyl sulfate and initiator are emulsified, an emulsion is obtained;

[0013] S3, after the emulsion and carbon black aqueous dispersion are mixed and polymerized, and then filtered and dried, a modified carbon black is obtained.

[0014] As a further technical solution, in step S1, the mass ratio of the carbon black to sodium dodecyl sulfate is 20:3.

[0015] As a further technical solution, in step S1, the mass-volume ratio of the carbon black to water is 1g:10mL.

[0016] As a further technical solution, in step S2, the emulsification is ultrasonic emulsification, the temperature of the ultrasonic emulsification is 5°C, and the time is 2min.

[0017] As a further technical solution, in step S2, the mass of the hexadecane is 3.5%-4.5% of the mass of the 2-hydroxyethyl acrylate, the mass of the initiator is 2%-3% of the mass of the 2-hydroxyethyl acrylate, and the mass of the sodium dodecyl sulfate is 1%-5% of the mass of the 2-hydroxyethyl acrylate.

[0018] As a further technical solution, the hexadecane is n-hexadecane.

[0019] As a further technical solution, the initiator is azobisisobutyronitrile.

[0020] As a further technical solution, in step S3, the mixing is ultrasonic mixing, the temperature of the ultrasonic mixing is 5-10°C, and the time is 3-5min.

[0021] As a further technical solution, in step S3, the polymerization temperature is 60-75°C, and the time is 2-4h.

[0022] As a further technical solution, the flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0023] As a further technical solution, the compatibilizer includes one or both of maleic anhydride grafted polypropylene and maleic anhydride grafted polyolefin elastomer.

[0024] As a further technical solution, the antioxidant includes one or both of antioxidant 1010 and antioxidant 1076.

[0025] As a further technical solution, the polyolefin elastomer is composed of a first polyolefin elastomer and a second polyolefin elastomer; the melt indexes of the first polyolefin elastomer and the second polyolefin elastomer are different.

[0026] As a further technical solution, the melt index of the first polyolefin elastomer is 30 g / 10 min, and the test condition is 190 DEG C / 2.16 kg; the melt index of the second polyolefin elastomer is 18 g / 10 min, and the test condition is 190 DEG C / 2.16 kg.

[0027] As a further technical solution, the mass ratio of the first polyolefin elastomer and the second polyolefin elastomer is 3-7:1.

[0028] The anti-aging cable protection pipe of the present application can improve the mechanical strength of the anti-aging cable protection pipe by compounding the first polyolefin elastomer with different melt indexes and the second polyolefin elastomer in a mass ratio of 3-7:1. When the mass ratio of the first polyolefin elastomer and the second polyolefin elastomer is less than 3:1, the high proportion of the second polyolefin elastomer will increase the melt viscosity of the system and reduce the processing fluidity, and internal stress concentration will easily occur during molding, thereby reducing the mechanical strength of the cable protection pipe. When the mass ratio of the first polyolefin elastomer and the second polyolefin elastomer is greater than 7:1, the high proportion of the first polyolefin elastomer will not sufficiently improve the mechanical strength of the material. When the mass ratio of the first polyolefin elastomer and the second polyolefin elastomer is 3-7:1, the processing fluidity and mechanical reinforcing effect of the two are synergistic, which can further improve the mechanical strength of the cable protection pipe.

[0029] The present application also provides a preparation method of the anti-aging cable protection pipe, which comprises the following steps: mixing the raw materials of the anti-aging cable protection pipe uniformly and then extruding and molding to obtain the anti-aging cable protection pipe.

[0030] As a further technical solution, a screw extruder is used during the extruding and molding, the screw rotation speed of the screw extruder is 120-180 rpm, the barrel temperature is 180-200 DEG C, and the die temperature is 200-210 DEG C.

[0031] The working principle and beneficial effects of the present application are as follows:

[0032] The present application can improve the light aging resistance of the cable protection pipe by adding poly(2-hydroxyethyl acrylate) modified carbon black. Carbon black can shield or absorb ultraviolet rays, but it is easy to agglomerate in a polypropylene matrix, which cannot well play the role of improving the light aging resistance of the cable protection pipe. The present application can improve the dispersibility of carbon black by modifying carbon black with poly(2-hydroxyethyl acrylate), thereby further improving the light aging resistance of the cable protection pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work, are within the scope of protection of the present application.

[0034] In the following examples and comparative examples, polypropylene, brand K8303, is purchased from Jiangsu Qianlang Technology Co., Ltd.; carbon black, model N330, is purchased from Tianjin Huayuan Chemical Technology Co., Ltd.; the first polyolefin elastomer, with a melt index of 30 g / 10 min, test conditions of 190℃ / 2.16 kg, model POE 8411, is purchased from Suzhou Xinqicheng Plasticizing Co., Ltd.; the second polyolefin elastomer, with a melt index of 18 g / 10 min, test conditions of 190℃ / 2.16 kg, model POE 8402, is purchased from Shanghai Plastic Development Import & Export Co., Ltd.; magnesium hydroxide, with a particle size of 40 μm; aluminum hydroxide, with a particle size of 10 μm; maleic anhydride grafted polypropylene, model 820, is purchased from Dongguan Kangjin New Material Technology Co., Ltd.; maleic anhydride grafted polyolefin elastomer, brand 6202, is purchased from Dongguan Mingyuan Plastic Co., Ltd.

[0035] Example 1

[0036] A preparation method of an anti-aging cable protection pipe, comprising the following steps: uniformly mixing 80 parts of polypropylene, 5 parts of modified carbon black, 15 parts of polyolefin elastomer, 20 parts of magnesium hydroxide, 2 parts of maleic anhydride grafted polypropylene and 0.5 parts of antioxidant 1010, and then extruding and molding by using a screw extruder under the conditions of a screw rotation speed of 120 rpm, a barrel temperature of 180℃ and a die temperature of 205℃ to obtain the anti-aging cable protection pipe; the polyolefin elastomer is the first polyolefin elastomer;

[0037] The preparation method of the modified carbon black comprises the following steps:

[0038] S1, dispersing carbon black and sodium dodecyl sulfate in water to obtain a carbon black water dispersion; the mass-volume ratio of carbon black and water is 1 g:10 mL; the mass ratio of carbon black and sodium dodecyl sulfate is 20:3;

[0039] S2, ultrasonic emulsifying 2- hydroxyethyl acrylate, n-hexadecane, sodium dodecyl sulfate and azobisisobutyronitrile at a temperature of 5℃ for 2 min to obtain an emulsion; the mass ratio of carbon black and 2-hydroxyethyl acrylate is 8:1; the mass of n-hexadecane is 4% of the mass of 2-hydroxyethyl acrylate; the mass of azobisisobutyronitrile is 2.5% of the mass of 2-hydroxyethyl acrylate; the mass of sodium dodecyl sulfate is 3% of the mass of 2-hydroxyethyl acrylate;

[0040] S3, after the emulsion and the carbon black water dispersion liquid are ultrasonically mixed for 5 min at a temperature of 5 DEG C, polymerization is carried out at 75 DEG C for 2 h, and then filtering and drying are carried out, to obtain the modified carbon black.

[0041] Example 2

[0042] A preparation method of an anti-aging cable protection pipe comprises the following steps: 90 parts of polypropylene, 6 parts of modified carbon black, 18 parts of polyolefin elastomer, 25 parts of aluminum hydroxide, 3 parts of maleic anhydride grafted polyolefin elastomer and 1 part of antioxidant 1076 are uniformly mixed, and then extrusion molding is conducted by using a screw extruder under the conditions that the screw rotation speed is 150 rpm, the barrel temperature is 190 DEG C and the die temperature is 200 DEG C, to obtain the anti-aging cable protection pipe; the polyolefin elastomer is a first polyolefin elastomer.

[0043] The preparation method of the modified carbon black comprises the following steps:

[0044] S1, carbon black and sodium dodecyl sulfate are dispersed in water to obtain a carbon black water dispersion liquid; the mass-volume ratio of carbon black and water is 1 g:10 mL; and the mass ratio of carbon black and sodium dodecyl sulfate is 20:3;

[0045] S2, 2-hydroxyethyl acrylate, n-hexadecane, sodium dodecyl sulfate and azobisisobutyronitrile are ultrasonically emulsified for 2 min at a temperature of 5 DEG C to obtain an emulsion; the mass ratio of carbon black and 2-hydroxyethyl acrylate is 8:1; the mass of n-hexadecane is 4% of the mass of 2-hydroxyethyl acrylate; the mass of azobisisobutyronitrile is 2.5% of the mass of 2-hydroxyethyl acrylate; and the mass of sodium dodecyl sulfate is 3% of the mass of 2-hydroxyethyl acrylate;

[0046] S3, after the emulsion and the carbon black water dispersion liquid are ultrasonically mixed for 4 min at a temperature of 8 DEG C, polymerization is carried out at 70 DEG C for 3 h, and then filtering and drying are carried out, to obtain the modified carbon black.

[0047] Example 3

[0048] A preparation method of an anti-aging cable protection pipe comprises the following steps: 100 parts of polypropylene, 7 parts of modified carbon black, 20 parts of polyolefin elastomer, 30 parts of magnesium hydroxide, 5 parts of maleic anhydride grafted polypropylene and 1.5 parts of antioxidant 1076 are uniformly mixed, and then extrusion molding is conducted by using a screw extruder under the conditions that the screw rotation speed is 180 rpm, the barrel temperature is 200 DEG C and the die temperature is 210 DEG C, to obtain the anti-aging cable protection pipe; the polyolefin elastomer is a first polyolefin elastomer.

[0049] The preparation method of the modified carbon black comprises the following steps:

[0050] S1, dispersing carbon black and sodium dodecyl sulfate in water to obtain a carbon black water dispersion; the mass-volume ratio of carbon black and water is 1 g:10 mL; the mass ratio of carbon black and sodium dodecyl sulfate is 20:3;

[0051] S2, ultrasonic emulsification of 2-hydroxyethyl acrylate, n-hexadecane, sodium dodecyl sulfate and azobisisobutyronitrile at a temperature of 5℃ for 2min to obtain an emulsion; the mass ratio of carbon black and 2-hydroxyethyl acrylate is 8:1; the mass of n-hexadecane is 4% of the mass of 2-hydroxyethyl acrylate; the mass of azobisisobutyronitrile is 2.5% of the mass of 2-hydroxyethyl acrylate; the mass of sodium dodecyl sulfate is 3% of the mass of 2-hydroxyethyl acrylate;

[0052] S3, ultrasonic mixing of the emulsion and the carbon black water dispersion at a temperature of 10℃ for 3min, then polymerization at 60℃ for 4h, and then filtering and drying to obtain modified carbon black.

[0053] Example 4

[0054] Compared with Example 3, the difference of the present embodiment is only that in the preparation method of the modified carbon black of the present embodiment, the mass ratio of carbon black and 2-hydroxyethyl acrylate is 9:1.

[0055] Example 5

[0056] Compared with Example 3, the difference of the present embodiment is only that in the preparation method of the modified carbon black of the present embodiment, the mass ratio of carbon black and 2-hydroxyethyl acrylate is 10:1.

[0057] Example 6

[0058] Compared with Example 1, the difference of the present embodiment is only that the polyolefin elastomer is composed of the first polyolefin elastomer and the second polyolefin elastomer with a mass ratio of 3:1.

[0059] Example 7

[0060] Compared with Example 1, the difference of the present embodiment is only that the polyolefin elastomer is composed of the first polyolefin elastomer and the second polyolefin elastomer with a mass ratio of 5:1.

[0061] Example 8

[0062] Compared with Example 1, the difference of the present embodiment is only that the polyolefin elastomer is composed of the first polyolefin elastomer and the second polyolefin elastomer with a mass ratio of 7:1.

[0063] Example 9

[0064] Compared with Example 1, the difference of the present embodiment is only that the polyolefin elastomer is the second polyolefin elastomer.

[0065] Comparative Example 1

[0066] Compared with Example 1, the only difference of the present comparative example is that the modified carbon black is replaced by an equal amount of carbon black in the present comparative example.

[0067] The aging-resistant cable protection pipes prepared from Examples 1-9 and Comparative Example 1 were tested according to the following methods:

[0068] 1. Tensile property test: The tensile strength of the cable protection pipe was tested according to the test method specified in the standard GB / T 8804.3-2003 "Determination of tensile properties of thermoplastics pipes - Part 3: Polyolefin pipes"; the test specimen was dumbbell type 1 sample with a thickness of 27.5 mm, and the test speed was 25 mm / min.

[0069] 2. Light aging resistance test: The light aging resistance of the cable protection pipe was tested according to the test method specified in the standard GB / T 16422.3-2022 "Plastics - Laboratory light source exposure test methods - Part 3: Fluorescent UV lamps"; the test method was Method A: No. 1 cycle in artificial accelerated weathering using UVA-340 lamps, and the test time was 720 h (60 cycles); the tensile strength of the cable protection pipe before and after light aging treatment was tested.

[0070] The test results are shown in Tables 1 and 2:

[0071] Table 1 Test results of light aging resistance of cable protection pipe

[0072]

[0073] As shown in Table 1, the addition of poly(2-hydroxyethyl acrylate) modified carbon black can improve the light aging resistance of the cable protection pipe.

[0074] Table 2 Test results of tensile property of cable protection pipe

[0075]

[0076] As shown in Table 2, when the polyolefin elastomer is composed of the first polyolefin elastomer and the second polyolefin elastomer, the tensile strength of the cable protection pipe can be improved.

[0077] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An aging-resistant cable protection pipe, characterized in that, The raw materials include the following components by weight: 80-100 parts polypropylene, 5-7 parts modified carbon black, 15-20 parts polyolefin elastomer, 20-30 parts flame retardant, 2-5 parts compatibilizer, and 0.5-1.5 parts antioxidant. The modified carbon black is obtained by modifying carbon black with poly(2-hydroxyethyl acrylate); The modified carbon black comprises the following raw materials in parts by weight: 80-100 parts carbon black, 10-12 parts 2-hydroxyethyl acrylate, and 0.2-0.3 parts initiator; the mass ratio of carbon black to 2-hydroxyethyl acrylate is 8-10:

1. The polyolefin elastomer is composed of a first polyolefin elastomer and a second polyolefin elastomer in a mass ratio of 3 to 7:1; the melt index of the first polyolefin elastomer is 30 g / 10 min, and the test conditions are 190℃ / 2.16 kg; the melt index of the second polyolefin elastomer is 18 g / 10 min, and the test conditions are 190℃ / 2.16 kg. The method for preparing the modified carbon black includes the following steps: S1. Disperse carbon black and sodium dodecyl sulfate in water to obtain a carbon black aqueous dispersion; S2. Emulsify 2-hydroxyethyl acrylate, hexadecane, sodium dodecyl sulfate and an initiator to obtain an emulsion; S3. After mixing and polymerizing the emulsion and carbon black aqueous dispersion, the modified carbon black is obtained by filtration and drying.

2. The aging-resistant cable protection pipe according to claim 1, characterized in that, In step S3, the mixing is ultrasonic mixing, and the ultrasonic mixing temperature is 5~10℃, and the time is 3~5min.

3. The aging-resistant cable protection pipe according to claim 1, characterized in that, In step S3, the polymerization temperature is 60~75℃ and the time is 2~4h.

4. A method for preparing an aging-resistant cable protection pipe, used to prepare an aging-resistant cable protection pipe as described in any one of claims 1 to 3, characterized in that, The process includes the following steps: mixing the raw materials of the aging-resistant cable protection tube evenly and then extruding them to obtain the aging-resistant cable protection tube.

5. The method for preparing an aging-resistant cable protection pipe according to claim 4, characterized in that, The extrusion molding process uses a screw extruder with a screw speed of 120~180 rpm, a barrel temperature of 180~200℃, and a die temperature of 200~210℃.

Images