Making process of glass fiber reinforced composite polypropylene pine with strengthening layer for both cold and hot water
A production method and polypropylene technology, applied in applications, household appliances, tubular items, etc., can solve the problems of easy corrosion, bending deformation, and large shrinkage of polypropylene for metal pipes, and achieve a wide range of applications, low cost, and materials. Energy saving effect
Active Publication Date: 2009-04-22
夏成文
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Problems solved by technology
[0002] At present, the common random copolymerized polypropylene (PP-R) plastic pipes for hot and cold water (referred to as PP-R pipes) on the market have the advantages of heat resistance, pressure resistance, corrosion resistance, aging resistance, and long service life. For 50 years, it has completely solved the shortcomings of metal pipes that are easy to corrode and have a short service life
However, the disadvantage of PP-R pipes is that the shrinkage rate of polypropylene is large, and the linear thermal expansion coefficient is too high. It is easy to bend and deform under the condition of long-term heat and pressure in use, so it needs to be replaced due to excessive bending. Cause a lot of trouble for users
It is also because of the easy bending deformation that limits the scope of application of PP-R pipes
Method used
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[0015] The manufacturing method of the glass fiber reinforced polypropylene composite pipe for hot and cold water with reinforcing ribs of the present invention will be described in conjunction with the accompanying drawings and embodiments.
[0016] The manufacturing method of the glass fiber reinforced polypropylene composite pipe with reinforcing ribs for hot and cold water of the present invention comprises the following steps:
[0017] ① Production of glass fiber reinforced polypropylene material:
[0018] Dry the glass fiber until the surface is activated, then carry out coupling treatment, add affinity agent, that is, add maleic anhydride grafted polypropylene with an addition of 20% (by weight) and bismaleimide with an addition of 0.8% (weight) or the addition of maleic anhydride grafted polypropylene is 20% (weight) and the addition of maleic anhydride is 5% (weight). Finally, together with the polypropylene material, it is plasticized in a twin-screw extruder, knead...
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The making process of glass fiber reinforced composite polypropylene pipe with strengthening layer for both cold and hot water includes the following steps: 1. preparing glass fiber reinforced polypropylene material through stoving glass fiber, surface activating, coupling, adding affiliating agent, kneading glass fiber and polypropylene in a double screw extruder of rotation speed of 30-45 Hz to form glass fiber reinforced polypropylene material with glass fiber content of 20 wt%, and pelletizing at 180-210 deg.c; and 2. making reinforced composite polypropylene pipe through extruding polypropylene material and glass fiber reinforced polypropylene material separately in two extruders, vacuum settling, cooling, cutting to certain length and packing. The glass fiber reinforced composite polypropylene pipe has less deformation, no separation among different extruded layers, long service life and other advantages.
Description
technical field [0001] The invention relates to a method for manufacturing a plastic composite pipe, in particular to a method for manufacturing a glass fiber reinforced polypropylene composite pipe for hot and cold water with a reinforcing layer. Background technique [0002] At present, the common random copolymerized polypropylene (PP-R) plastic pipes for hot and cold water (referred to as PP-R pipes) on the market have the advantages of heat resistance, pressure resistance, corrosion resistance, aging resistance, and long service life. In 50 years, it has completely solved the shortcomings of metal pipes that are easy to corrode and have a short service life. However, the disadvantage of PP-R pipes is that the shrinkage rate of polypropylene is large, and the linear thermal expansion coefficient is too high. It is easy to bend and deform under the condition of long-term heat and pressure in use, so it needs to be replaced due to excessive bending. Bring a lot of trouble...
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IPC IPC(8): B29C47/06B29C47/20B29C47/92B29B9/00B29B9/14C08J3/20B29K23/00B29K105/06B29L23/00B29C48/32B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C2948/9259B29C2948/92885B29C2948/92895
Inventor 夏成文
Owner 夏成文