Mute water discharging pipe
A drainage pipe and silent technology, which is applied in water supply installations, indoor sanitary pipe installations, buildings, etc., can solve the problems of poor high temperature resistance and chemical corrosion resistance, large noise of drainage pipes, and unsatisfactory effect, etc., and achieves mechanical performance. Excellent, saving pipe fittings, excellent mute effect
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[0038] Example
[0039] The raw material composition of the three-layer polypropylene silent drainage pipe prepared by the present invention is shown in Table 1. Among them, the performance indicators of the block copolymer polypropylene are as follows: the density of the resin is 0.895~0.910g / cm 3 , Melt index (230℃ / 2.16kg): 1.8±0.2g / 10min, Izod impact strength is not less than 93J / M, Rockwell hardness is not less than 85R, and flexural modulus is not less than 1100MPa. In addition, the present invention also made a comparative example 1 for the case where the special material for PP silent pipe is used as the middle sound-absorbing layer, and other conditions are the same as those in Example 1. The raw material ratio is shown in Table 1.
[0040] The present invention adopts a three-layer co-extrusion method to prepare a polypropylene silent drainage pipe, and the specific steps are:
[0041] (1) Melt and blend polypropylene resin and noise absorbing material at 80°C to form the mi...
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