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Method for preparing high-strength heat-resistant and cold-resistant modified polypropylene pipe

A polypropylene pipe material and polypropylene technology, applied to rigid pipes, pipes, mechanical equipment, etc., can solve the problems of high low-temperature brittleness, large creep, and high cost of use, and achieve good heat and cold resistance and improved creep resistance , The effect of extending the service life

Active Publication Date: 2013-03-13
HONGYUE PLASTIC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The modified polypropylene pipe produced by the existing technology can only meet the long-term use temperature below 95°C under relatively high pressure conditions, and the pipe has poor rigidity, large creep, large low-temperature brittleness, fast aging, and thickened pipe wall design. Waste of raw materials and high cost of use have greatly affected the wide use of modified polypropylene pipes in hot and cold water projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a. Preparation of outer layer material

[0043] (1), initial mixing of outer layer material

[0044] Mix 100 kg of block polypropylene and 0.5 kg of polypropylene-methacrylate graft copolymer, stir for 10 minutes at a temperature of 55°C, and cool to 35°C for blending in the next process;

[0045] (2), outer material blending

[0046] Mix 2 kg of natural rubber, 1 kg of silver ion antibacterial agent, 2 kg of thiobisphenol, 1.8 kg of phosphorous acid antioxidant, 12 kg of active nano mica, and 1 kg of white masterbatch, heat and stir for 10 minutes, when the temperature reaches 75 Add the above-mentioned outer layer initial mixture at ℃, continue to stir until 105℃, stop stirring, then cool to 45℃ and send to the next process for use;

[0047] b. Preparation of intermediate transition layer material

[0048] 40 kg of polyoxymethylene, 40 kg of polyamide, 100 kg of random copolymerized polypropylene, 30 kg of polypropylene-caprolactone graft copolymer, 20 kg of maleic...

Embodiment 2

[0057] a. Preparation of outer layer material

[0058] (1) Initial mixing of the outer layer material

[0059] Take 100 kg of random copolymerized polypropylene, 0.4 kg of maleic anhydride graft copolymer, and 0.5 kg of ethylene-vinyl acetate copolymer, mix them, heat and stir for 10 minutes at a temperature of 40°C, cool to 25°C for blending in the next process use;

[0060] (2), outer material blending

[0061] Mix 1.5 kg of styrene-butadiene rubber, 1.2 kg of copper ion antibacterial agent, 2.4 kg of benzoate, 1.0 kg of phosphorous acid antioxidant, 10 kg of active nano mica, and 1 kg of gray masterbatch, heat and stir for 15 minutes, when the temperature reaches Add the above-mentioned outer layer primary mixture at 75°C, continue to stir until 105°C, stop stirring, then cool to 45°C and send it to the process for use;

[0062] b. Preparation of intermediate transition layer material

[0063] 35 kg of polycarbonate, 45 kg of polyamide, 100 kg of random copolymerized p...

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PUM

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Abstract

The invention discloses a method for preparing a high-strength heat-resistant and cold-resistant modified polypropylene pipe. The pipe is formed by the following steps of: extruding an outer layer, a middle transition layer and an inner wall layer onto the same one mold through three extruders, fusing and compounding. The outer layer of the pipe consists of modified polypropylene, an impact-resistant modifying agent, an antibacterial agent, a light stabilizer, an antioxygen, a compatibilizer, nanometer materials, a tackifier and a color masterbatch in parts by weight; the middle transition layer of the pipe consists of engineering plastics, the modified polypropylene, the compatibilizer, the a tackifier and the color masterbatch in parts by weight; and the inner wall layer of the pipe consists of the engineering plastics, the modified polypropylene, the compatibilizer, a fortifier, a filler, the nanometer materials and the color masterbatch in parts by weight. Compared with traditional similar pipes, the operating temperature of the pipe prepared by the method disclosed by the invention is improved by 30-70 DEG C; the cold-resistant temperature is lowered by minus 15-minus 30 DEG C; the pressure-resistant property is improved by 30-50 percent; the creep resistance is improved by 100-200 percent; the service life is prolonged by 10-20 years; and the wall thickness of the pipe is reduced by 20-50 percent.

Description

technical field [0001] The invention relates to plastic pipes, in particular to a preparation method of high-strength heat-resistant and cold-resistant modified polypropylene pipes. Background technique [0002] The modified polypropylene pipe produced by the existing technology can only meet the long-term use temperature below 95°C under relatively high pressure conditions, and the pipe has poor rigidity, large creep, large low-temperature brittleness, fast aging, and thickened pipe wall design. The waste of raw materials and the high cost of use have greatly affected the wide use of modified polypropylene pipes in hot and cold water projects. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a high-strength heat-resistant and cold-resistant modified polypropylene pipe against the deficiencies of the prior art. [0004] The technical solution for realizing the purpose of the present invention is: a method for pre...

Claims

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Application Information

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IPC IPC(8): F16L9/12B29C47/92B29C47/06C08L53/00C08L51/06C08L7/00C08K13/02C08K5/375C08K3/34C08L23/14C08L59/00C08L77/00C08L51/00C08L93/02C08L69/00C08L81/02C08K13/04C08K7/14C08K3/36C08K3/26B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92876
Inventor 张双全马君王锡臣郭晓玲任宇红
Owner HONGYUE PLASTIC GROUP
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