Low-temperature-resistant high-flame-retardant high-electrical-property polyvinyl chloride cable material and preparation method thereof

Abstract

The invention discloses a low-temperature-resistant, high-flame-retardant and high-electrical-property polyvinyl chloride cable material and a preparation method thereof. The low-temperature-resistant high-flame-retardant high-electrical-property polyvinyl chloride cable material comprises the following raw material components in parts by weight: 50-75 parts of polyvinyl chloride resin A; 25 to 50 parts of polyvinyl chloride resin B; 15-20 parts of a plasticizer A; 10-15 parts of a plasticizer B; 10-15 parts of a plasticizer C; 10-15 parts of a cold-resistant modifier; 5-10 parts of a flame retardant A; 10-15 parts of a flame retardant B; 15-25 parts of a flame retardant C; 6-8 parts of a heat-resistant stabilizer; 10 to 15 parts of an electrical property modifier; 0.2 to 0.5 part of a lubricant A; 0.2 to 0.5 part of a lubricant B; the cable material disclosed by the invention has the characteristics of cold resistance, high electrical property, high flame retardant property and the like, and is suitable for being used in extremely cold severe environments with high electrical property requirements and high flame retardant property requirements.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of cable material, and particularly relates to a low-temperature-resistant high-flame-retardant high-electric-property polyvinyl chloride cable material and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the cable industry, the performance requirements of cable materials are also continuously improving. In particular, cable materials used in extremely cold and harsh environments with high electrical performance requirements and high flame retardant performance requirements face severe challenges. Although traditional polyvinyl chloride cable materials have high mechanical strength, good insulation performance and other advantages, they still have deficiencies in cold resistance and flame retardant performance.

[0003] Currently, conventional polyvinyl chloride cable materials have poor durability in low-temperature environments and environmental pollution problems. Although the performance of polyvinyl chloride can be improved by adding various additives, it is difficult to simultaneously meet the requirements of cold resistance, flame retardancy, high electrical performance, and other aspects. In particular, in the field of medium and high voltage cables, the performance requirements for insulation and sheath materials are higher due to the more severe use environment.

[0004] Therefore, a new type of low-temperature-resistant high-flame-retardant high-electric-property polyvinyl chloride cable material needs to be developed to address the many shortcomings of existing materials when used in extreme environments. This new material not only needs to have excellent cold resistance, but also needs to consider high flame retardancy and electrical performance, while ensuring environmental friendliness and processing performance. The development of such a multifunctional composite material will help promote the development of the cable industry towards high-end and environmental friendliness, and provide a more reliable solution for cable applications in extreme environments. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a low-temperature-resistant high-flame-retardant high-electric-property polyvinyl chloride cable material and a preparation method thereof. The cable material has excellent cold resistance, high flame retardancy, and high electrical performance, and is suitable for use in extremely cold and harsh environments with high electrical performance requirements and high flame retardant performance requirements.

[0006] To solve the above technical problems, the present application provides the following technical solution: a low-temperature-resistant high-flame-retardant high-electric-property polyvinyl chloride cable material, which comprises the following raw material components in a weight ratio:

[0007] 50-75 parts of polyvinyl chloride resin A;

[0008] 25-50 parts of polyvinyl chloride resin B;

[0009] 15-20 parts of plasticizer A;

[0010] 10-15 parts of plasticizer B;

[0011] Plasticizer C 10-15 parts;

[0012] Cold resistance modifier 10-15 parts;

[0013] Flame retardant A 5-10 parts;

[0014] Flame retardant B 10-15 parts;

[0015] Flame retardant C 15-25 parts;

[0016] Heat resistance stabilizer 6-8 parts;

[0017] Electric property modifier 10-15 parts;

[0018] Lubricant A 0.2-0.5 parts;

[0019] Lubricant B 0.2-0.5 parts;

[0020] Preferably, the polyvinyl chloride A is selected from Beiyuan SG-3, which has a large relative molecular mass, and is strong in material strength, rigidity, heat resistance, low-temperature resistance and toughness;

[0021] Preferably, the high-polymerization-degree polyvinyl chloride is selected from Shanghai Chlor-alkali SH-200, which can improve the strength, wear resistance, heat resistance, anti-aging performance and oil resistance of the polymer, and improve the extinction of the polymer;

[0022] Preferably, the plasticizer A is selected from dioctyl phthalate DOTP, which is used as a plasticizer for polyvinyl chloride, and improves the thermal stability and light stability of the polymer;

[0023] Preferably, the plasticizer B is selected from bis(2-propylheptyl) adipate (LH-80), which is used as a plasticizer for polyvinyl chloride, and improves the cold resistance of the polymer;

[0024] Preferably, the plasticizer C is selected from DuPont HP441, which has good compatibility with PVC, and makes the product have excellent cold resistance and can pass the low-temperature impact embrittlement test at -40℃;

[0025] Preferably, the cold resistance modifier is selected from CPE 135A, which has good compatibility with PVC and good processing performance, and makes the product have excellent cold resistance;

[0026] Preferably, the flame retardant A is selected from antimony trioxide, and the purity is preferably 99.8%;

[0027] Preferably, the flame retardant B is selected from a silicate flame retardant synergist, which is a mixture of magnesium silicate and aluminum silicate;

[0028] Preferably, the flame retardant C is selected from aluminum hydroxide, which improves the mechanical properties and flame retardant properties;

[0029] Preferably, the heat-resistant stabilizer is selected from calcium-zinc stabilizer K7004, which is environmentally friendly, has good plasticizing flow, and has toughening and melting promotion effects;

[0030] Preferably, the electrical property modifier is selected from calcined kaolin, which has high chemical properties and light scattering rate;

[0031] Preferably, the lubricant A is selected from PE wax, which is selected from first-class products and has a melting point of 105°C;

[0032] Preferably, the lubricant B is selected from calcium stearate, which is a PVC heat stabilizer and has lubricating properties and good light and heat stabilizing effects.

[0033] The low-temperature-resistant high-flame-retardant high-electrical-property PVC cable material described in the present application has an oxygen index of 36%, passes low-temperature impact embrittlement at -40°C, and has a volume resistivity greater than 1.0 x 10 12 Ω·m.

[0034] The preparation method of the low-temperature-resistant high-flame-retardant high-electrical-property PVC cable material described in the present application comprises the following steps:

[0035] a. The formula amount of polyvinyl chloride resin A, polyvinyl chloride resin B, plasticizer A, plasticizer B, flame retardant A, flame retardant B, flame retardant C, heat-resistant stabilizer, electrical property modifier, lubricant A, and lubricant B are weighed and added to a high-speed mixer, the rotation number of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 10-15 minutes to obtain a preliminary mixture;

[0036] b. The formula amount of plasticizer C and cold-resistant modifier A is weighed and added to the preliminary mixture of step a, the rotation number of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 40-60 seconds to obtain a final mixture;

[0037] c. After mixing, the final mixture obtained in step b is processed by a double-screw extruder;

[0038] d. The process temperature of the double-screw extruder needs to pass through 10 zones, and the temperature of the 10 zones from small to large is 140±10°C, 140±10°C, 150±10°C, 150±10°C, 160±10°C, 160±10°C, 160±10°C, 160±10°C, 160±10°C, and 160±10°C;

[0039] e. After the extruded material of step d is cooled by water and air, it is cut by a granulator and screened by a vibrating screen, and a low-temperature-resistant high-flame-retardant high-electrical-property PVC cable material is obtained.

[0040] Preferably, the rotating speed of the twin-screw extruder is 350-400 rpm, and the rotating speed of the feeding device of the extruder is 35-40 rpm.

[0041] The techniques not mentioned in the present application refer to the prior art.

[0042] The low-temperature high-flame-retardant high-electric-property cable material of the present application has good mechanical properties, good large / small cross-section extrusion properties, good processing properties, stable glue output, smooth extrusion surface without particles, and can be applied to extreme cold and harsh environments with high electric property requirements and high flame-retardant property requirements. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The production process flow chart of the present application is shown in the following figure: DETAILED DESCRIPTION

[0044] In order to better understand the present application, the following examples are further illustrated, but the content of the present application is not limited to the following examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0045] Table 1: Raw material components used in each example

[0046]

[0047]

[0048] Table 2: Raw material components used in each example

[0049]

[0050] Preparation method: the preparation method of the low-temperature resistant high-flame-retardant high-electric-property polyvinyl chloride cable material of the above-mentioned examples 1 and 2, including the following steps:

[0051] a. The formula amount of polyvinyl chloride resin A, polyvinyl chloride resin B, plasticizer A, plasticizer B, flame retardant A, flame retardant B, flame retardant C, heat-resistant stabilizer, electric property modifier, lubricant A and lubricant B are weighed and added into a high-speed mixer, the rotating speed of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 15 minutes, to obtain a primary mixture;

[0052] b. The formula amount of plasticizer C and cold-resistant modifier A are weighed and added into the primary mixture of step a, the rotating speed of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 60 seconds, to obtain a final mixture;

[0053] c After the mixing is completed, the final mixture obtained in step (b) is processed by a twin-screw;

[0054] d The process temperature of the twin-screw extruder is required to pass through 10 zones, and the temperatures of the 10 zones from small to large are 140±10℃, 140±10℃, 150±10℃, 150±10℃, 160±10℃, 160±10℃, 160±10℃, 160±10℃, 160±10℃, and 160±10℃, respectively.

[0055] e After the extruded material in step d is cooled by water and air, it is cut by a granulator and screened by a vibrating screen, and a low-temperature-resistant high-flame-retardant high-electrical-property PVC cable material is obtained.

[0056] The rotation speed of the twin-screw extruder is 350-400 rpm, and the feeding rotation speed of the extruder is 35-40 rpm.

[0057] The test results are as follows:

[0058] Table 3 Properties of the products obtained in each example

[0059] Test item Unit Test standard Example 1 Example 2 Conventional PVC material Specific gravity g / cm 3 ]] GB / T 1033 1.395 1.405 1.400 Tensile strength MPa GB / T 1040 19.5 18.5 18.8 Tensile strain at break ％ GB / T 1040 265 248 250 Low temperature impact embrittlement (-40℃) / GB / T 5470 Pass Pass Fail Oxygen index ％ GB / T 2406 36.2 36.5 30 Volume resistivity at 20℃ Ω·m GB / T 1040 1.8 x 10 12 ]] 2.1 x 10 12 ]] 1.5 x 10 11 <!-- 4 -->]]> Thermal stability time at 200℃ min GB / T 2951 150 150 120

[0060] As can be seen from the results of example 1 and example 2 and the conventional PVC material, the low-temperature-resistant high-flame-retardant high-electrical-property PVC cable material of the present application, starting from the formula, uses the design of multiple flame retardants in synergistic action, significantly improves the high flame retardant property, further enhances the flame retardant property of the material, and meets the higher requirements of the cable field on the flame retardant property; by reasonably proportioning various plasticizers and modifiers, the electrical property of the cable material is improved, and the insulation property and electrical strength of the material in a high-voltage environment are improved; the use of HP441 solid plasticizer changes the cold resistance of the material under high flame retardant requirements, significantly improves the cold resistance of the cable material, and overcomes the poor durability of traditional polyvinyl chloride cable material in a low-temperature environment; by adding a heat-resistant stabilizer, the cable material has excellent heat-resistant stability, effectively prevents the performance decay of the material in a high-temperature environment, and ensures the long-term stability of the cable in an extreme environment.

Claims

1. A low temperature resistant, high flame retardant, high electrical performance polyvinyl chloride cable compound characterized in that: The raw material components are proportioned by weight as follows: PVC resin A 75 parts PVC resin B 25 parts Plasticizer A 20 parts Plasticizer B 15 parts Plasticizer C 12 parts Cold resistance modifier 12 parts Flame retardant A 8 parts Flame retardant B 10 parts Flame retardant C 20 parts Heat resistance stabilizer 7 parts Electric property modifier 10 parts Lubricant A 0.3 parts Lubricant B 0.3 parts The PVC resin A is Beiyuan SG-3; the PVC resin B is Shanghai Chlor-alkali SH-200; The plasticizer A is dioctyl terephthalate; the plasticizer B is di(2-propylheptyl) adipate (LH-80); the plasticizer C is ELVALOY HP441; The cold resistance modifier is CPE 135A; The flame retardant A is antimony trioxide; the flame retardant B is silicate flame retardant synergist; the flame retardant C is aluminum hydroxide; The heat resistance stabilizer is calcium-zinc stabilizer with model number K7004; The electric property modifier is calcined kaolin; The lubricant A is polyethylene wax; the lubricant B is calcium stearate.

2. The low temperature resistant, high flame retardant and high electrical performance polyvinyl chloride cable material according to claim 1, characterized in that: with an oxygen index of 36%, a low-temperature embrittlement passing -40°C and a volume resistivity greater than 1.0 x 10 12 Ω·m.

3. The process for the preparation of low temperature resistant, high flame retardant, high electrical performance polyvinyl chloride cable material as claimed in claim 1, wherein, the process is characterized by, The specific steps are as follows: (a) The formula amount of PVC resin A, PVC resin B, plasticizer A, plasticizer B, flame retardant A, flame retardant B, flame retardant C, heat resistance stabilizer, electric property modifier, lubricant A and lubricant B are weighed and added into a high-speed mixer, the rotation number of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 10-15 minutes to obtain a primary mixture; (b) The formula amount of plasticizer C and cold resistance modifier A is weighed and added into the primary mixture of step (a), the rotation number of the high-speed mixer is ensured to be 1500 r / min, and the mixing duration is 40-60 seconds to obtain a final mixture; (c) After the mixing is completed, the final mixture obtained in step (b) is processed by a double screw; (d) The process temperature of the double screw extruder needs to pass through 10 zones, and the temperature of the 10 zones from small to large is 140±10℃, 140±10℃, 150±10℃, 150±10℃, 160±10℃, 160±10℃, 160±10℃, 160±10℃, 160±10℃, 160±10℃; (e) After the extruded material of step d is cooled by water and air, it is cut by a granulator and screened by a vibrating screen, and a low-temperature-resistant high-flame-retardant high-electric-property PVC cable material is obtained.

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