阅读说明：本技术 一种耐热性聚乙烯复合管的制造方法 (Manufacturing method of heat-resistant polyethylene composite pipe ) 是由 杜永明 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种耐热性聚乙烯复合管的制造方法,具体按照以下步骤实施：步骤1、给管材定型,给定型后管材涂胶,先挤出内管,内层经由胶层挤出机均匀涂覆一层EVA型粘合树脂；步骤2、再使用另一台挤出机,把添加了交联剂的耐热聚乙烯材料包覆到EVA型粘合树脂上,形成聚乙烯外管,使内管与外管两者紧密连接,组成完整的聚乙烯复合管,解决了现有技术中存在的聚乙烯复合管耐热性差的问题。(The invention discloses a method for manufacturing a heat-resistant polyethylene composite pipe, which is implemented according to the following steps: step 1, sizing a pipe, coating glue on the sized pipe, extruding an inner pipe, and uniformly coating a layer of EVA (ethylene vinyl acetate) type adhesive resin on an inner layer through a glue layer extruder; and 2, coating the heat-resistant polyethylene material added with the cross-linking agent on EVA type adhesive resin by using another extruder to form a polyethylene outer tube, and tightly connecting the inner tube and the outer tube to form a complete polyethylene composite tube, so that the problem of poor heat resistance of the polyethylene composite tube in the prior art is solved.)

1. The method for manufacturing the heat-resistant polyethylene composite pipe is characterized by comprising the following steps of:

step 1, sizing a pipe, coating glue on the sized pipe, extruding an inner pipe, and uniformly coating a layer of EVA (ethylene vinyl acetate) type adhesive resin on an inner layer through a glue layer extruder;

and 2, coating the heat-resistant polyethylene material added with the cross-linking agent on EVA type adhesive resin by using another extruder to form a polyethylene outer tube, and tightly connecting the inner tube and the outer tube to form the complete polyethylene composite tube.

2. The method for manufacturing a heat-resistant polyethylene composite pipe according to claim 1, wherein the thickness of the inner pipe is 1-4 mm.

3. The method for manufacturing a heat-resistant polyethylene composite pipe according to claim 1,

the thickness of the outer pipe is 1-4 mm.

4. The method for manufacturing a heat-resistant polyethylene composite pipe according to claim 1, wherein the amount of the crosslinking agent added is 1 to 6% by mass of the heat-resistant polyethylene material.

5. The method for manufacturing the heat-resistant polyethylene composite pipe according to claim 1, wherein in the step 1, the step of sizing the pipe is specifically performed as follows:

step 1.1, extruding polyethylene resin, and forming through a pipe die;

step 1.2, vacuum sizing;

and step 1.3, spraying and cooling, and shaping the polyethylene pipe.

6. The method for manufacturing the heat-resistant polyethylene composite pipe according to claim 1, wherein in the step 1, the sizing of the shaped pipe is specifically performed as follows: step 2.1, extruding the hot melt adhesive;

step 2.2, gluing: after passing through the gluing mold, a layer of molten film is formed on the outer surface of the polyethylene plastic pipe while producing the polyethylene plastic pipe, and then the surface of the polyethylene plastic pipe is coated with hot melt glue, so that the hot melt glue and the surface of the polyethylene plastic pipe are bonded into a whole in a molten state.

Technical Field

The invention belongs to the technical field of composite pipe manufacturing, and relates to a method for manufacturing a heat-resistant polyethylene composite pipe.

Background

At present, the water supply pipeline in China mainly comprises galvanized steel pipes, the galvanized steel pipes are good in mechanical property, pressure-resistant and impact-resistant, but the galvanized steel pipes are poor in corrosion resistance, rough in inner wall, easy to scale and easy to breed microorganisms, secondary pollution of drinking water can be caused after long-term use, yellow water is overflowed, the galvanized steel pipes are eliminated due to the defects in the performance, and the high-density polyethylene pipes are good in cracking resistance, low-temperature resistance, sanitary, non-toxic, chemical medium corrosion resistance, convenient to install, capable of adopting a non-excavation technology, long in service life and the like, and are widely used in the fields of building water supply, drainage, building heating, urban water supply and drainage, urban gas, underground coal mine conveying, electric power, telecommunication protection, industry, agriculture and the like. However, because the material itself does not have heat resistance, when the medium with the temperature higher than 45 ℃ is conveyed, the pressure is reduced, the pressure bearing capacity is obviously reduced, and the application of the pipe in the medium conveying field such as medium and high temperature is limited.

Disclosure of Invention

The invention aims to provide a method for manufacturing a heat-resistant polyethylene composite pipe, which solves the problem of poor heat resistance of the polyethylene composite pipe in the prior art.

The invention adopts the technical scheme that the manufacturing method of the heat-resistant polyethylene composite pipe is implemented according to the following steps:

step 1, sizing a pipe, coating glue on the sized pipe, extruding an inner pipe, and uniformly coating a layer of EVA (ethylene vinyl acetate) type adhesive resin on an inner layer through a glue layer extruder;

and 2, coating the heat-resistant polyethylene material added with the cross-linking agent on EVA type adhesive resin by using another extruder to form a polyethylene outer tube, and tightly connecting the inner tube and the outer tube to form the complete polyethylene composite tube.

The invention is also characterized in that:

the thickness of the inner pipe is 1-4 mm.

The thickness of the outer tube is 1-4 mm.

The addition amount of the cross-linking agent is 1-6% of the heat-resistant polyethylene material by mass ratio.

In the step 1, the tube is shaped specifically as follows:

step 1.1, extruding polyethylene resin, and forming through a pipe die;

step 1.2, vacuum sizing;

and step 1.3, spraying and cooling, and shaping the polyethylene pipe.

In the step 1, the sizing of the pipe is specifically implemented as follows: step 2.1, extruding the hot melt adhesive;

step 2.2, gluing: after passing through the gluing mold, a layer of molten film is formed on the outer surface of the polyethylene plastic pipe while producing the polyethylene plastic pipe, and then the surface of the polyethylene plastic pipe is coated with hot melt glue, so that the hot melt glue and the surface of the polyethylene plastic pipe are bonded into a whole in a molten state.

The invention has the beneficial effects that: the invention relates to a method for manufacturing a heat-resistant polyethylene composite pipe, which solves the problem of poor heat resistance of the polyethylene composite pipe in the prior art. The high-strength high-pressure-resistance high-strength high.

Detailed Description

The present invention will be described in detail with reference to the following embodiments.

The invention relates to a method for manufacturing a heat-resistant polyethylene composite pipe, which is implemented according to the following steps:

step 1, sizing a pipe, coating glue on the sized pipe, extruding an inner pipe, and uniformly coating a layer of EVA (ethylene vinyl acetate) type adhesive resin on an inner layer through a glue layer extruder;

in the step 1, the tube is shaped specifically as follows:

step 1.1, extruding polyethylene resin, and forming through a pipe die;

step 1.2, vacuum sizing;

and step 1.3, spraying and cooling, and shaping the polyethylene pipe.

In the step 1, the sizing of the pipe is specifically implemented as follows: step 2.1, extruding the hot melt adhesive;

step 2.2, gluing: after passing through the gluing mold, a layer of molten film is formed on the outer surface of the polyethylene plastic pipe while producing the polyethylene plastic pipe, and then the surface of the polyethylene plastic pipe is coated with hot melt glue, so that the hot melt glue and the surface of the polyethylene plastic pipe are bonded into a whole in a molten state.

And 2, coating the heat-resistant polyethylene material added with the cross-linking agent on EVA type adhesive resin by using another extruder to form a polyethylene outer tube, and tightly connecting the inner tube and the outer tube to form the complete polyethylene composite tube.

Wherein, the thickness of the inner pipe is 1-4mm, the thickness of the outer pipe is 1-4mm, and the addition amount of the cross-linking agent is 1-6% of the heat-resistant polyethylene material according to the mass ratio.