Rigid polyurethane-coated polyethylene-twisted prefabricated directly-buried insulation pipe and preparation method thereof
A rigid polyurethane, prefabricated direct burial technology, applied in the direction of thermal insulation, pipeline protection through thermal insulation, pipeline protection, etc., can solve the problems of reducing the life of the pipe network, inconsistent movement of each other, increased thermal insulation energy consumption, etc., and prolong the service life. , the density is uniform, the effect of strengthening the bonding strength
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[0047] The present invention also provides a preparation method for the above-mentioned rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, comprising the following steps:
[0048] S1, according to mass ratio 1:0.75-0.8, the polyether polyol of mass ratio 100:1 and nano cerium oxide alcohol dispersion liquid white material and polyisocyanate black material are mixed evenly, spray polyurethane foam on steel pipe body, obtain polyurethane foam layer;
[0049] S2, aging the polyurethane foam layer obtained in step S1 at 20-30° C. for 8-10 hours to obtain a polyurethane insulation layer with a thickness of 30-100 mm;
[0050] S3, coating the surface of the polyurethane insulation layer obtained in step S2 with nano-rare earth mixed powder composed of cyclodextrin and nano-rare earth with a mass ratio of 2-3:1, to obtain a rare-earth connection layer with a thickness of 0.5-1 μm;
[0051] S4, melting and plasticizing the high-d...
Embodiment 1
[0054] Example 1 Rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe and preparation method thereof
[0055] A rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, which sequentially includes a steel pipe body, a 30mm thick polyurethane thermal insulation layer, a 0.5μm thick rare earth connection layer and a 4mm thick high density polyethylene outer protective layer from the inside to the outside;
[0056] The rare earth connecting layer is composed of cyclodextrin and nano rare earth cerium oxide with a mass ratio of 2:1.
[0057] Its preparation method comprises the following steps:
[0058] S1. According to the mass ratio of 1:0.75, mix the polyether polyol polyol and nano-cerium oxide alcohol dispersion white material and polyisocyanate black material with a mass ratio of 100:1 evenly, spray polyurethane foam on the steel pipe body, and obtain polyurethane foam layer...
Embodiment 2
[0064] Example 2 Rigid polyurethane sprayed polyethylene winding prefabricated direct buried insulation pipe and preparation method thereof
[0065] A rigid polyurethane spray-coated polyethylene winding prefabricated direct-buried thermal insulation pipe, which sequentially includes a steel pipe body, a 100mm thick polyurethane thermal insulation layer, a 1μm thick rare earth connection layer and a 9mm thick high density polyethylene outer protective layer from the inside to the outside;
[0066] The rare earth connecting layer is composed of cyclodextrin and nano rare earth cerium oxide with a mass ratio of 3:1.
[0067] Its preparation method comprises the following steps:
[0068] S1. According to the mass ratio of 1:0.8, mix the polyether polyol polyol with a mass ratio of 100:1 and nano-cerium oxide alcohol dispersion white material and polyisocyanate black material, spray polyurethane foam on the steel pipe body, and obtain polyurethane foam layer;
[0069] S2. Aging ...
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