Telescopic hose and preparation method thereof

Abstract

The invention discloses a telescopic hose and a preparation method thereof. The telescopic hose at least comprises an outer hose body and an inner hose body. The material of the outer hose body includes the following raw materials by weight: 100 parts of TPE, 1-8 parts of SiO2, and 0.1-1 part of an antistatic agent; and the material of the inner hose body includes the following raw materials by weight: 100 parts of PVC; 1-30 parts of EPDM, 1-30 parts of NBR, 0.3-1.0 part of a stabilizer, 10-80 parts of a plasticizer and 0.1-1 part of PE wax. The preparation method includes: subjecting the material of the inner hose body to melt extrusion, and then conducting molding, traction and shaping to obtain the inner hose body; conducting melt extrusion on the material of the outer hose body, compounding the melted and extruded material to the inner hose body, and carrying out cooling and traction to obtain a finished product. The telescopic hose provided by the invention has the advantages of high strength, static resistance, good flexibility and long service life.

Description

technical field [0001] The invention relates to the technical field of plastic hoses, in particular to a stretchable hose. Background technique [0002] Existing plastic telescopic hoses used in fields such as irrigation or car washing have the following quality defects: 1. During handling and use, static electricity is easily generated on the surface due to friction, which will cause dust to be absorbed and it is difficult to remove; 2. The surface hardness is not enough, and the wear resistance Poor; 3. Poor tensile strength and rolling resistance; 4. The pipe generally has a two-layer structure. After the outer layer is broken due to dragging and wear, the inner bellows are easier to damage; 5. After multiple stretches, the pipe Tensile fatigue is prone to occur, thus loss of tensile properties or aging. [0003] The outer material of the existing plastic composite telescopic hose is TPE thermoplastic elastomer, with a wall thickness of about 1.0mm. It has good flexibili...

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Problems solved by technology

[0002] Existing plastic telescopic hoses used in fields such as irrigation or car washing have the following quality defects: 1. During handling and use, static electricity is easily generated on the surface due to friction, which will cause dust to be absorbed and it is difficult to remove; 2. The surface hardness is not enough, and the wear resistance Poor; 3. Poor tensile strength and rolling resistance; 4. The pipe generally has a two-layer structure. After the outer layer is broken due to dragging and wear, the inner bellows are easier to damage; 5. After multiple stretches, the pipe Susceptible to tensile fatigue, resulting in loss of tensile properties or aging

[0003] The outer material of the existing plastic composite telescopic hose is TPE thermoplastic elastomer, with a wall thickness of about 1.0mm. It has good flexibility and high resilience, but the surface hardness is poor and not wear-resistant; After modification, the EVA material has a certain toughness and impact resistance. The outer material of the pipe only considers the resilience during use, ignoring its wear resistance. During repeated use, the pipe will be dragged back and forth repeatedly, and as time goes by The outer layer material will be worn out; the inner layer material only considers the good toughness of PP, so the inner wall thickness of the pipe is controlled at 0.6mm to facilitate expansion and contraction, but the fatigue resistance of the pipe is not considered, and the wall thickness is too thin, so Stretch resistance and rolling resistance are very poor. The pipe will be stretched and folded repeatedly n times during use, and will break at the fold over time, and will explode at the break due to water pressure

Therefore, the existing flexible hose generally has the problem of low service life

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