Synthetic resin hose

Abstract

Surface tackiness of a hose is improved without using a partially crosslinked resin. By heat-molding a hose while mixing a plurality of synthetic resins having different molecular weights in the surface of the hose, particles of the synthetic resins having high molecular weights remain in the molten synthetic resins having low molecular weights, thereby forming fisheyes in the hose surface. Fine projections and recesses due to the fisheyes make the hose surface into a low friction surface.

Description

technical field [0001] The present invention relates to a synthetic resin pipe having improved adhesion to the pipe surface. [0002] Specifically, it relates to a synthetic resin tube in which a transparent low-friction surface is formed on the tube surface. Background technique [0003] Conventionally, as such a synthetic resin pipe, there is a sprinkler pipe for a pipe reel in which the pipe wall has an inner layer forming a water passage, a pressure-resistant mesh provided outside the inner layer, and an outer layer covering the pressure-resistant mesh. In the outer layer, As a polyvinyl chloride-based resin composition containing a partially crosslinked resin, it contains 10 to 90% by weight (preferably 40 to 70% by weight) of a partially crosslinked resin relative to the main polyvinyl chloride resin, or as a polyvinyl chloride resin composition containing a partially crosslinked resin. The polyolefin resin composition, relative to the main polyolefin resin, makes it ...

AI Technical Summary

Problems solved by technology

[0005] However, in such conventional synthetic resin pipes, since the melting temperature of the partially crosslinked resin is significantly higher than that of the non-crosslinked general resin, the pipes containing the partially crosslinked resin are sequentially manufactured in the same pipe production line. In the case of low-friction tubes and general tubes that do not contain partially cross-linked resin, when manufacturing other general tubes, the partially cross-linked resin used in the previous production is likely to be mixed, and even a small amount of mixed in can improve molding It is also difficult to melt at the heating temperature, so there is a problem that an irregular low-friction surface is locally generated and it becomes a defective product.

[0006] Furthermore, not only is the partially cross-linked resin expensive, but also a surface modifier needs to be added, so there is a problem of cost increase

[0007] Furthermore, if a surface modifying agent such as calcium carbonate is added to the partially crosslinked resin, transparency cannot be obtained, and there is also a problem of translucency or whitening in the form of frosted glass.