阅读说明：本技术 一种双层异种材质电线及其制备方法 (A kind of bilayer heterogeneous material electric wire and preparation method thereof ) 是由 李平 李蓬 王历华 邹宇鹏 伊瑞鹏 钟文涛 于 2019-08-20 设计创作，主要内容包括：本发明目的在于提供一种简单高效成本低的双层异种材料电线的制备方法。采用双层注塑机。内层进料为PU+发泡剂,外层进料PVC塑料。高温下发泡,内层膨胀但是外层为高弹态,发泡后,发泡外层达到最大形变,通过调节温度和PVC塑料层厚度来控制发泡层厚度。冷却降温,外层凝固成为玻璃态,电线定型,内层为压缩泡沫塑料。整体工艺简单快捷,易于操作,需要操控参数少。(It is an object of that present invention to provide a kind of preparation methods for being simple and efficient the double-deck dissimilar material electric wire at low cost.Using double injection machine.Internal layer charging is PU+ foaming agent, and outer layer feeds PVC plastic.It foams under high temperature, still outer layer is elastomeric state to inner layer expansion, and after foaming, foamed coating reaches largest deformation, controls depth of foam by adjusting temperature and PVC plastic thickness of feed layer.It cools, outer layer solidifies out into glassy state, electric wire sizing, and internal layer is compression foam plastics.Integrated artistic is simple and fast, easily operated, needs operating parameter few.)

1. a kind of bilayer heterogeneous material electric wire is coextruded preparation method, which comprises the following steps:

(1) head is gone out using double-layer coextrusion, interior mold feeding inlet pan feeding is unexpanded polyurethane fluid, and outer mold feeding inlet enters Material is viscous state PVC；

(2) it adjusts room temperature and starts cabling to T, while opening ectonexine charging, after coextrusion, PU layers of foam start to expand, cabling Speed 100-300M/min；

(3) foaming is completed, and is cooled to room temperature, is obtained the double-deck heterogeneous material electric wire；

The temperature T is between 15-40 DEG C.

2. preparation method according to claim 1, which is characterized in that the polyurethane foam time controls in 15- 20s。

3. preparation method according to claim 1, which is characterized in that the PVC is wear-resisting PVC material, in room temperature shape It is elastomeric state under state, flow temperature is 80-100 DEG C, and glass transition temperature is less than 5 DEG C.

4. preparation method according to claim 1, which is characterized in that the polyurethane foam temperature is 5-40 DEG C.

5. a kind of double-deck heterogeneous material electric wire by any preparation method preparation of claim 1-4, which is characterized in that answer For open air.

6. bilayer heterogeneous material electric wire according to claim 5, which is characterized in that the electric wire double braid covering outer layer is Wear-resisting PVC material；Internal layer is foamed polyurethane, with a thickness of 2-5cm.

Technical field

The present invention relates to a kind of double-deck electric wire and preparation method thereof, specifically, it is wear-resisting PVC that the present invention, which provides a kind of outer layer, Material, internal layer are the double-deck dissimilar material electric wire of foamed urethane material, using coextrusion method preparation, simple and fast easy behaviour Make.

Background technique

Protected mode of the outdoor electric wire due to lacking the routine such as indoor electric wire box, and use environment is severe --- it is passing Vehicle rolls；Cross the extreme weathers such as cold overheat；Friction, cracky etc. are directly contacted with coarse ground.And the electricity of single material Line outer layer is difficult to deal with various conditions, and every kind of material has respective limitation.So on the market, there are the double-deck electric wires.But This bilayer electric wire, current preparation method are the double-deck material coextrusion of the same race.Such as patent CN106448949A, and it is current The electric wire of the double-deck heterogeneous material also has very much, such as CN101770831A and patent CN109801746A are the double-deck xenogenesis material Matter electric wire, but preparation method using wrapping up layer by layer.At present in production technology, there are no the coextrusion of the double-deck dissimilar material The preparation method of electric wire outer layer.

Summary of the invention

For technical problem present in this field, the present invention is provided outside a kind of simply and easily double-deck heterogeneous material electric wire The coextrusion preparation method and products thereof of layer.

A kind of bilayer heterogeneous material electric wire coextrusion preparation method, comprising the following steps:

(1) head is gone out using double-layer coextrusion, interior mold feeding inlet pan feeding is unexpanded polyurethane fluid, and outer mold feeding inlet enters Material is viscous state PVC；

(2) it adjusts room temperature and starts cabling to T, while opening ectonexine charging, after coextrusion, PU layers of foam start to expand, cabling Speed 100-300M/min；

(3) foaming is completed, and is cooled to room temperature, is obtained the double-deck heterogeneous material electric wire；

The temperature T is between 15-40 DEG C.

Wherein, the polyurethane foam time controls in 15-20s.

Wherein, the PVC is wear-resisting PVC material, is elastomeric state under normal temperature state, and flow temperature is 80-100 DEG C, Glass transition temperature is less than 5 DEG C.

Wherein, the polyurethane foam temperature is 5-40 DEG C.

The double-deck heterogeneous material electric wire of above method preparation, which is characterized in that be applied to open air.

Wherein, the electric wire double braid covering outer layer is wear-resisting PVC material；Internal layer is foamed polyurethane, with a thickness of 2- 5cm。

The present invention prepares the double-deck heterogeneous material electric wire using the method for coextrusion, temperature after being squeezed out by control --- quickly It is cooled to T(20-40 DEG C), allow the outer layer PVC of the viscous state of extrusion to be converted to elastomeric state, and also in the polyurethane of cream time Then in internal layer.Polyurethane foams at temperature T, volume expansion, and the PVC of outer layer is elastomeric state at this time, will not be by foam Polyurethane volume change is burst.By controlling the control of temperature, to determine the degree of outer layer PVC deformation, to control internal layer hair Steep the thickness of polyurethane.Emphasis of the invention is control temperature T, according to the thickness needs of inner foam polyurethane, to set temperature Degree, changes the largest deformation amount of outer layer PVC, to reach the needs of control inner foam polyurethane thickness.By the above method, Disposably the double-deck heterogeneous material electric wire, simple process, strong operability, in original machinery equipment can be prepared by coetrusion It is produced, without new equipment is introduced, further saves cost.

Specific implementation method

The existing double injection machine extrusion die of our company, patent No. CN106448949A, specifically used method is in patent document It has been described in detail.The raw materials used in the present invention, such as PVC granule (viscous state conversion temperature is 80 DEG C), foaming PU(foamed time is 15-20S and be free of release agent) be that market is bought, processing workshop temperature is room temperature, and room temperature is defaulted as 25 DEG C.Trace speed is adopted Use 300M/min.