Composite plastic tube

Abstract

The invention discloses a composite plastic tube which consists of a plurality of layers, wherein the outermost layer is an anti-wearing layer consisting of 100 parts by weight of low density polyethylene, 3-10 parts by weight of EVA (ethylene vinyl acetate copolymer) and 0.5-2 parts by weight of an antioxidant; the middle layer is a reinforcing layer consisting of 80-85 parts by weight of high density polyethylene HDPE 100 and 5-15 parts of nano calcium carbonate; the inner layer is a clean type water delivery layer consisting of 96-100 parts of high density polyethylene HDPE 100, 4-6 parts of antibacterial master batch and 2-4 parts of an antioxidant; the antibacterial master batch is prepared as follows: adding 70-75 parts by weight of high density polyethylene HDPE 100 into 20-25 parts by weight of a nano inorganic antibacterial agent containing sliver irons to obtain a mixture; mixing the mixture with 1-3 parts by weight of a silane coupling agent to obtain a mixture II; and drying the mixture II and 3-5 parts by weight of POE or a bulking agent to prepare the antibacterial master batch. According to the composite plastic tube disclosed by the invention, three layers of tube materials are different and are formed under the same thermoplastic process condition, and therefore, the layers are tightly embedded and are firmly connected.

Description

technical field [0001] The invention generally relates to a pressure pipe for conveying liquid, in particular to a composite plastic pipe for conveying drinking water. Background technique [0002] At present, plastic pipes widely used in water transportation are mainly polyethylene pipes and polypropylene pipes (PP-R) pipes. The resins of these two materials are thermoplastics, which have the general advantages and disadvantages of thermoplastic pipes. The advantage is that the hydraulic performance is good, the material density is small, the weight is light, and the installation is convenient. The disadvantages are: the elastic mold of polyethylene resin material is small and the rigidity is poor. The delivery pressure of the pipe made by it should not be too high, generally lower than 1.0MPa. The rigidity of polypropylene plastic is higher than that of polyethylene, but its low temperature impact resistance is poor. Under high temperature conditions, the pipe is easily d...

AI Technical Summary

Problems solved by technology

The disadvantages are: the elastic mold of polyethylene resin material is small and the rigidity is poor. The delivery pressure of the pipe made by it should not be too high, generally lower than 1.0MPa. The rigidity of polypropylene plastic is higher than that of polyethylene, but its low temperature impact resistance is poor. Under high temperature conditions, the pipe is easily deformed, resulting in leakage, and the weather resistance of polypropylene material is poor. In the process of processing, it is necessary to add necessary antioxidants

The water resistance of the antioxidant needs to be investigated, and it may be precipitated from the tube with the increase of the external environment temperature, which will have unpredictable effects on the human body

The above two kinds of pipes are easy to scratch the surface during transportation and installation, forming damage points, causing hidden quality and safety accidents

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