Preparation method of tensile compressive high temperature resistant modified polypropylene power pipe
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A technology of polypropylene and high temperature resistance, which is applied in the field of preparation of tensile, compression and high temperature resistant modified polypropylene power pipes. And other problems, to achieve the effect of prolonging the light and oxygen aging time, good impact strength and corrosion resistance, and high welding tensile strength
Active Publication Date: 2013-02-27
HONGYUE PLASTIC GROUP
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And the modified polypropylene pipe material of prior art production, flexural strength is 36-38MPa, and flexural elastic modulus is 1000-1500MPa, and body tensile strength is 24-26MPa, and welding tensile strength is 22.5-24MPa, if meet quicksand or In complex projects, the pipe is easily broken at the welding joi
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Embodiment 1
[0028] (1) Primary mix
[0029] Take 100 kg of block copolymerized polypropylene, 0.5 kg of sodium di-p-tert-butylphenyl phosphate, and 0.8 kg of polyacrylate liquid crystal, mix them, heat and stir for 10 minutes, when the temperature reaches 65°C, add 1 kg of EPDM rubber, carbonic acid Calcium 0.8 kg, titanium dioxide 0.8 kg, thioester antioxidant 0.25 kg, salicylate 0.15 kg, continue to stir until 95°C, stop stirring, cool to 35°C and send to the next process for blending;
[0030] (2) Blending
[0031] Take 5 kg of polyamide, 1 kg of polypropylene-methacrylate graft copolymer, 0.6 kg of rosin acid glyceride, and 1 kg of white masterbatch, heat and stir for 15 minutes, and add the For primary mixing, continue to stir until 110°C, stop stirring, and cool to 35°C for use in the next process;
[0032] (3) Granulation
[0033] Extrude and granulate the above blended material through a single-screw or twin-screw extruder. The temperature of the first zone of the extruder barr...
Embodiment 2
[0037] (1) Primary mix
[0038] Take 100 kg of random copolymerized polypropylene, 0.6 kg of alkyl sorbitan ester, and 1.1 kg of polysiloxane liquid crystal, mix them, heat and stir for 10 minutes, when the temperature reaches 65°C, add 1.1 kg of natural rubber, 0.8 kg of quartz sand, titanium dioxide 0.9 kg, 0.5 kg of phosphorous acid antioxidant, 0.8 kg of silicon dioxide, continue stirring until 95°C, stop stirring, and send to the next process for blending when cooled to 35°C;
[0039] (2) Blending
[0040] Take 5 kg of polyoxymethylene, 0.8 kg of ethylene-vinyl acetate copolymer, 1 kg of polypropylene-methacrylate graft copolymer, 0.5 kg of rosin resin, and 1 kg of red masterbatch, heat and stir for 10 minutes, when the temperature reaches 90 Add the initial mixture of the previous process at ℃, stop stirring when it reaches 110 ℃, cool to 35 ℃ for the next process;
[0041] (3) Granulation
[0042] Extrude and granulate the above blended material through a single-screw ...
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Abstract
The invention discloses a preparation method of a tensile compressive high temperature resistant modified polypropylene power pipe. The pipe comprises 100 weight parts of modified polypropylene, 0.5-15 weight parts of tackifier, 0.1-15 weight parts of nano material, 0.1-15 weight parts of liquid crystal material, 0.5-15 weight parts of shock resistant modifier, 0.1-15 weight parts of nucleating agent, 0-30 weight parts of filling masterbatch, 0.1-5 weight parts of color masterbatch, 0.5-30 weight parts of engineering plastic, 0.5-15 weight parts of compatibilizer, 0.05-5 weight parts of antioxidant, and 0.05-5 weight parts of light stablilizer, and is prepared by carrying out mixing granulation on the raw materials and then conducting extrusion molding through a mold. According to the invention, compared with existing MPP pipe, the bending strength of the produced MPP pipe disclosed herein is raised by 30-50%, the bending elastic modulus is raised by 25-60%, the welding tensile strength reaches 26-33 MPa, 70 DEG C ring hot compression force is raised by 30-50%, the photooxidation aging resistant time is prolonged by 5-15 years, the vicat softening point is raised by 5-20 DEG C, the shock strength and corrosion resistance are good, thus the produced MPP pipe disclosed herein can meet the requirements for high standard quality electric power engineering, and the engineering cost is reduced.
Description
technical field [0001] The invention relates to a plastic pipe, in particular to a preparation method of a tensile, compressive and high temperature resistant modified polypropylene power pipe. Background technique [0002] At present, the excavation and non-excavation sheathing pipes used on high-voltage cables are mainly modified polypropylene (abbreviated as MPP in the industry) pipes. And the modified polypropylene pipe material of prior art production, flexural strength is 36-38MPa, and flexural elastic modulus is 1000-1500MPa, and body tensile strength is 24-26MPa, and welding tensile strength is 22.5-24MPa, if meet quicksand or In complex projects, the pipe is easily broken at the welding joint; the thermal compression force of the ring piece (section) at a high temperature of 70°C is low. Large size and high cost; the anti-discoloration and anti-aging performance of the pipe is poor, which affects the service life, and it is difficult to meet the requirements of hig...
Claims
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