A kind of modified polypropylene, polyethylene composite wear-resistant pipe production method


Release time:

2021-08-31

The present invention relates to a pipe, especially a polyethylene composite wear-resistant pipe. Polyethylene pipe is widely used in petroleum, chemical, mining, construction and other industries because of its light weight, corrosion resistance, long service life and other advantages. In the process of use, the existing polyethylene pipe is found to have the following problems: poor abrasion resistance, short service life; poor heat fusion connectivity brings difficulties to pipe construction and installation.

The present invention relates to a pipe, especially a polyethylene composite wear-resistant pipe. Polyethylene pipe is widely used in petroleum, chemical, mining, construction and other industries because of its light weight, corrosion resistance, long service life and other advantages. In the process of use, the existing polyethylene pipe is found to have the following problems: poor abrasion resistance, short service life; poor heat fusion connectivity brings difficulties to pipe construction and installation.

In view of the shortcomings of the existing technology, the technicians propose a super wear-resistant modified polypropylene and polyethylene composite wear-resistant pipe with good wear resistance, long service life, and good heat fusion connection performance. The technical purpose of the present invention is realized by the following technical solutions. The improvement of the super wear-resistant modified polypropylene/polyethylene composite wear-resistant pipe is that the super wear-resistant modified polypropylene/polyethylene composite wear-resistant pipe has a three-layer composite structure of a polypropylene outer layer, a polyethylene intermediate layer, and a polyurethane inner layer in sequence from the outside to the inside. The polypropylene outer layer and the polyethylene intermediate layer form a composite wear-resistant pipe through a hot melt adhesive layer between the two pipe layers. The thickness of the inner polyurethane layer is 1.0-2.0 mm. The polypropylene outer layer is a polypropylene pipe extruded from a modified polypropylene material; the polyethylene intermediate layer is extruded from a peroxide cross-linked polyethylene material; and the material of the polyethylene intermediate layer is a polyethylene with a molecular weight of more than 250 units.

Compared with the prior art, the above invention has the following positive effects:

This super wear-resistant modified polypropylene and polyethylene composite wear-resistant pipe is a three-layer composite structure, consisting of a polypropylene outer layer, a polyethylene intermediate layer, and a polyurethane inner layer from the outside to the inside; a further improvement is that the polypropylene outer layer and the polyethylene intermediate layer form a composite wear-resistant pipe by means of a hot-melt adhesive layer between the two layers of the pipe; the polyurethane inner layer is of a thickness of 1.0- 2.0 millimeters; the polypropylene outer layer is extruded from modified polypropylene material polypropylene pipe; the polyethylene intermediate layer is extruded from a peroxide crosslinked polyethylene material; in another embodiment, the polyethylene intermediate layer is made from polyethylene having a molecular weight of more than 250 units. The present invention has high abrasion resistance, good hot-melt connection performance, good chemical stability, good antistatic and flame retardant properties.

1. The outer layer is a polypropylene layer extruded from modified polypropylene material, which has excellent hot-melt connection performance, facilitates the connection and installation of pipes, and ensures the tightness of the pipe connection.

2. The inner layer is a polyurethane inner layer, which is more than 10 times more wear-resistant than cast iron pipe, 4 times more wear-resistant than manganese steel pipe, and 12 times more wear-resistant than stainless steel pipe, which significantly improves the wear-resistant property of the invention.

3. The polyethylene intermediate layer is extruded from peroxide cross-linked polyethylene material, which makes the pipe high strength, high temperature resistance (110 test 8800 hours), high chemical molecular inertia and stable performance.

4. The polyethylene intermediate layer is made of polyethylene with a molecular weight of more than 250 units, which gives the pipe better antistatic and flame retardant properties.

 

 

 

Key words:

Wear-resistant pipes


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