Teflon hose capable of being spirally formed and smooth in inner surface and preparation method thereof

Abstract

The invention discloses a teflon hose capable of being spirally formed and smooth in inner surface and a preparation method thereof. The teflon hose is composed of a modified polytetrafluoroethylene inner pipe and an outer sleeve pipe arranged outside the polytetrafluoroethylene inner pipe in a sleeving mode, the modified polytetrafluoroethylene inner pipe and the outer sleeve pipe each are of a tubular structure with a hollow middle portion, the outer wall of the modified polytetrafluoroethylene inner pipe and the inner wall of the outer sleeve pipe each are of a spiral corrugated structure,the modified polytetrafluoroethylene inner pipe is made of the following raw materials of polytetrafluoroethylene powder, polyamide-imide, barium sulfate micro-powder, nano-silica, a silane coupling agent and glycerol, and the outer sleeve pipe is formed by sequentially compounding a winding layer, a fiber woven layer and a rubber outer layer from inside to outside. According to the teflon hose capable of being spirally formed and smooth in inner surface, in the using process, the situation of mutual sliding or popping up among all the layers can be avoided, so that the probability of leakageof the teflon hose is effectively reduced, and the teflon hose has excellent wear resistance, creep resistance and compression resistance.

Description

technical field [0001] The invention relates to the technical field of polytetrafluoroethylene hoses, in particular to a Teflon hose which can be spirally formed and has a smooth inner surface and a preparation method thereof. Background technique [0002] Teflon hose is often used as a pipeline for transferring gas or liquid. The existing Teflon hose is composed of a polytetrafluoroethylene inner tube, a spiral steel wire layer, a steel wire weaving layer and a rubber outer layer from the inside to the outside. Existing Teflon hose mainly has the following problems: 1, the connection between the polytetrafluoroethylene inner tube of existing Teflon hose, the spiral steel wire layer, the steel wire weaving layer and the rubber outer layer is a socket connection, which is relatively There is a gap between the two adjacent layers, and the two adjacent layers are easy to move, and a tight connection cannot be formed; 2. When the Teflon hose and the joint are connected in pract...

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Problems solved by technology

Existing Teflon hose mainly has the following problems: 1, the connection between the polytetrafluoroethylene inner tube of existing Teflon hose, the spiral steel wire layer, the steel wire weaving layer and the rubber outer layer is a socket connection, which is relatively There is a gap between the two adjacent layers, and the two adjacent layers are easy to move, and a tight connection cannot be formed; 2. When the Teflon hose and the joint are connected in practical applications, the spiral steel wire layer is easy to loosen and pop out of place, and The steel wire braided layer is very prone to slippage, which increases the probability of leakage after the connection between the Teflon hose and the joint; 3. In actual use, the Teflon hose and the joint are formed by crimping, and the buckle pressure is greater than 400 tons, and Before crimping, the spiral corrugation on the outside of the PTFE inner tube needs to be ironed at high temperature, which requires the use of additional professional high-temperature heating equipment, the operation process is complicated and the production cost is increased; When the inner diameter of the PTFE inner tube of the Teflon hose is greater than 25mm, the inner surface can only be made into a corrugated shape, and cannot be made into a smooth plane, otherwise the hose will not be bent and easily damaged; while the corrugated inner surface is in many In the application environment, the transported materials will be retained and cannot be cleaned effectively, especially in the fields of food, pharmaceuticals, and chemical industry, which may easily cause pollution or bacterial growth. In practical applications, the inner diameter of the PTFE inner tube is greater than 25mm, such as 38mm, 51mm, 63mm, and 76mm are commonly used sizes; 5. When the existing Teflon hose transports gas or fluid, the PTFE inner tube is in direct contact with the fluid, so the PTFE inner tube is more prone to loss. The Teflon inner tube in the existing Teflon hose cannot be pulled out separately. If the Teflon inner tube is worn out, the entire Teflon hose must be replaced, which increases the maintenance cost; 6. Existing Teflon hoses have the disadvantages of non-abrasion resistance, easy creep, and poor compression resistance

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