CN111070744A - Production method of high-performance spraying winding heat preservation pipe - Google Patents
Production method of high-performance spraying winding heat preservation pipe Download PDFInfo
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- CN111070744A CN111070744A CN201911385158.4A CN201911385158A CN111070744A CN 111070744 A CN111070744 A CN 111070744A CN 201911385158 A CN201911385158 A CN 201911385158A CN 111070744 A CN111070744 A CN 111070744A
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- polyethylene
- performance
- production method
- outer protective
- polyurethane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
Abstract
The invention provides a production method of a high-performance spraying winding thermal insulation pipe, wherein polyurethane is sprayed in the rotating and advancing process of a steel pipe, an automatic funnel device is arranged above a spraying room, the automatic funnel device starts to scatter modified polymer powder downwards while the steel pipe advances, the modified polymer powder uniformly falls on the surface of a polyurethane layer which is sprayed, initiated, cured and finished, and the adhesion between the cured polyurethane layer and a polyethylene outer protective layer is improved. The production method of the high-performance spraying and winding thermal insulation pipe can effectively improve the adhesion between the polyurethane layer and the polyethylene outer protective layer, avoid bubbles generated when high-temperature molten polyethylene is wound on the surface of the solidified polyurethane layer, and improve the performance of the polyethylene outer protective layer.
Description
Technical Field
The invention belongs to the field of heat preservation pipes, and particularly relates to a production method of a high-performance spraying winding heat preservation pipe.
Background
After the national standard GB/T34611-: firstly, the polyurethane has uniform density, high closed pore rate and high compressive strength; the outer protective layer has strong annular anti-cracking capability due to low internal stress, the wall thickness can be reduced within a certain range according to the requirements of customers, and the cost is saved; thirdly, the axial eccentricity of the insulating pipe can be reduced. Under prior art, appear easily in the production of spraying wound form insulating tube: the adhesion between the polyurethane layer and the polyethylene outer protective layer can not meet the requirement, bubbles are easy to appear when the high-temperature molten polyethylene is wound on the surface of the solidified polyurethane layer, the performance of the polyethylene outer protective layer can not meet the requirement, and the like.
Disclosure of Invention
In view of this, the present invention is directed to a method for producing a high-performance spray-wound thermal insulation pipe, which can effectively improve the adhesion between a polyurethane layer and a polyethylene outer sheath, prevent high-temperature molten polyethylene from being wound on the surface of a cured polyurethane layer to generate bubbles, and improve the performance of the polyethylene outer sheath.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a production method of a high-performance spray-wound thermal insulation pipe comprises the following steps:
step 1: the spraying of polyurethane is carried out in the process of the rotation and the advance of the steel pipe, an automatic funnel device is arranged above a spraying room, the automatic funnel device starts to scatter modified polymer powder downwards while the steel pipe advances, the modified polymer powder uniformly falls on the surface of the polyurethane layer which is sprayed, initiated, cured and finished, and the adhesion of the cured polyurethane layer and the polyethylene outer protective layer is improved;
step 2: when the sprayed semi-finished product is conveyed to the front of an extrusion gun head of an extruder by a trolley, an organic self-adhesive film is wound on the surface of the solidified polyurethane in advance, so that the adhesion between the solidified polyurethane layer and the polyethylene outer protective layer is improved;
and step 3: the extruder extrudes high-temperature molten polyethylene from the gun head, the high-temperature molten polyethylene is coiled on the surface of the spray-molded cured polyurethane layer after being sliced by the compression roller and is compacted, and the high-temperature molten polyethylene is coiled on the surface of the cured polyurethane layer without bubbles by the compression roller with the preset large diameter and the small length.
Further, in step 1, the modified polymer powder is PE polyethylene powder.
Furthermore, the raw material used by the extruder is high-density polyethylene resin particles, wherein a small amount of modified high-density polyethylene particles are added simultaneously, so that the performance of the extruded polyethylene outer protective layer is improved.
Compared with the prior art, the production method of the high-performance spraying winding heat preservation pipe has the following advantages:
the production method of the high-performance spraying and winding thermal insulation pipe can effectively improve the adhesion between the polyurethane layer and the polyethylene outer protective layer, avoid bubbles generated when high-temperature molten polyethylene is wound on the surface of the solidified polyurethane layer, and improve the performance of the polyethylene outer protective layer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic flow chart of a production method of a high-performance spray-wound thermal insulation pipe according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a production method of a high-performance spray-wound thermal insulation pipe comprises the following steps:
step 1: the spraying of polyurethane is carried out in the process of the rotation and the advance of the steel pipe, an automatic funnel device is arranged above a spraying room, the automatic funnel device starts to scatter modified polymer powder downwards while the steel pipe advances, the modified polymer powder uniformly falls on the surface of the polyurethane layer which is sprayed, initiated, cured and finished, and the adhesion of the cured polyurethane layer and the polyethylene outer protective layer is improved;
the spraying of polyurethane is carried out in the rotatory in-process of marcing of steel pipe, generally need carry out the pipe end coping after the spraying is complete, and the surface is even smooth after the coping, but polyurethane powder can adhere on the surface of heat preservation, influences the adhesion of polyurethane and polyethylene, and automatic funnel device is the modified polymer powder that spills downwards, improves the adhesion of solidification polyurethane layer and polyethylene outer jacket.
Step 2: when the sprayed semi-finished product is conveyed to the front of an extrusion gun head of an extruder by a trolley, an organic self-adhesive film is wound on the surface of the solidified polyurethane in advance, so that the adhesion between the solidified polyurethane layer and the polyethylene outer protective layer is improved;
the melting temperature of the organic self-adhesive film is about 100 ℃, the organic self-adhesive film is easy to combine with polyethylene, and the adhesiveness of the cured polyurethane layer and the polyethylene outer protective layer can be improved.
And step 3: the extruder extrudes high-temperature molten polyethylene from the gun head, the high-temperature molten polyethylene is coiled on the surface of the spray-molded cured polyurethane layer after being sliced by the compression roller and is compacted, and the high-temperature molten polyethylene is coiled on the surface of the cured polyurethane layer without bubbles by the compression roller with the preset large diameter and the small length.
In the prior art, bubbles are easy to appear after molten polyethylene is wound on the surface of polyurethane, and the bubbles are difficult to catch up and are larger and larger, so that the quality and the appearance of the polyethylene outer protective layer are influenced. Through repeated tests, the length of the compression roller is reduced and the diameter of the compression roller is increased by using the compression roller with the preset large diameter and the small length, so that bubble-free production is realized.
As shown in fig. 1, in step 1, the modified polymer powder is PE polyethylene powder.
As shown in fig. 1, the raw material used in the extruder is high density polyethylene resin pellets, wherein a small amount of modified high density polyethylene pellets are added simultaneously to improve the properties of the extruded polyethylene outer sheath.
In the prior art, the used polyethylene particles are high-density polyethylene resin, raw materials which are not lower than PE80 grade are adopted, only coloring agents such as color masterbatch are added in the raw materials, but the numerical values of tensile yield strength and elongation at break of the polyethylene outer protective layer produced according to the high-density polyethylene resin and the color masterbatch are unstable, particularly the elongation at break of the polyethylene outer protective layer cannot meet the requirements, and the performance of the polyethylene outer protective layer can be greatly improved by adding a certain proportion of modified high-density polyethylene particles in the high-density polyethylene resin, so that the polyethylene outer protective layer can meet the quality requirements.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A production method of a high-performance spraying winding thermal insulation pipe is characterized by comprising the following steps: the method comprises the following steps:
step 1: the spraying of polyurethane is carried out in the process of the rotation and the advance of the steel pipe, an automatic funnel device is arranged above a spraying room, the automatic funnel device starts to scatter modified polymer powder downwards while the steel pipe advances, the modified polymer powder uniformly falls on the surface of the polyurethane layer which is sprayed, initiated, cured and finished, and the adhesion of the cured polyurethane layer and the polyethylene outer protective layer is improved;
step 2: when the sprayed semi-finished product is conveyed to the front of an extrusion gun head of an extruder by a trolley, an organic self-adhesive film is wound on the surface of the solidified polyurethane in advance, so that the adhesion between the solidified polyurethane layer and the polyethylene outer protective layer is improved;
and step 3: the extruder extrudes high-temperature molten polyethylene from the gun head, the high-temperature molten polyethylene is coiled on the surface of the spray-molded cured polyurethane layer after being sliced by the compression roller and is compacted, and the high-temperature molten polyethylene is coiled on the surface of the cured polyurethane layer without bubbles by the compression roller with the preset large diameter and the small length.
2. The production method of the high-performance spray-wound thermal insulation pipe according to claim 1, characterized in that: in step 1, the modified polymer powder is PE polyethylene powder.
3. The production method of the high-performance spray-wound thermal insulation pipe according to claim 1, characterized in that: in step 3, the raw material used by the extruder is high-density polyethylene resin particles, wherein a small amount of modified high-density polyethylene particles are added simultaneously, so that the performance of the extruded polyethylene outer protective layer is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911385158.4A CN111070744A (en) | 2019-12-28 | 2019-12-28 | Production method of high-performance spraying winding heat preservation pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911385158.4A CN111070744A (en) | 2019-12-28 | 2019-12-28 | Production method of high-performance spraying winding heat preservation pipe |
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| CN111070744A true CN111070744A (en) | 2020-04-28 |
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| CN201911385158.4A Pending CN111070744A (en) | 2019-12-28 | 2019-12-28 | Production method of high-performance spraying winding heat preservation pipe |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1746549A (en) * | 2004-09-07 | 2006-03-15 | 江苏地龙管业有限公司 | Buried thermal-insulative pipe with polythene |
| CN105666843A (en) * | 2016-03-18 | 2016-06-15 | 天华化工机械及自动化研究设计院有限公司 | Hot-extrusion circumferential winding forming method of steel bend pipe 3PE coating |
| CN105909883A (en) * | 2016-05-30 | 2016-08-31 | 中国海洋石油总公司 | Marine polyurethane spraying prefabricated thermal insulation balance weight pipe and preparation method thereof |
| CN205664010U (en) * | 2016-06-07 | 2016-10-26 | 天津市管道工程集团有限公司 | Prefabricated cryrogenic spraying winding hot oil line |
| CN109383051A (en) * | 2017-08-02 | 2019-02-26 | 德士达（天津）管道设备有限公司 | A kind of continuously collinearly formula spraying winding prefabricated direct-buried thermal insulation pipe production line and its application |
| CN209309492U (en) * | 2018-12-13 | 2019-08-27 | 宁夏青龙塑料管材有限公司 | A kind of expanded polystyrene (EPS) direct-burried thermal insulating plastic composite tube road |
-
2019
- 2019-12-28 CN CN201911385158.4A patent/CN111070744A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1746549A (en) * | 2004-09-07 | 2006-03-15 | 江苏地龙管业有限公司 | Buried thermal-insulative pipe with polythene |
| CN105666843A (en) * | 2016-03-18 | 2016-06-15 | 天华化工机械及自动化研究设计院有限公司 | Hot-extrusion circumferential winding forming method of steel bend pipe 3PE coating |
| CN105909883A (en) * | 2016-05-30 | 2016-08-31 | 中国海洋石油总公司 | Marine polyurethane spraying prefabricated thermal insulation balance weight pipe and preparation method thereof |
| CN205664010U (en) * | 2016-06-07 | 2016-10-26 | 天津市管道工程集团有限公司 | Prefabricated cryrogenic spraying winding hot oil line |
| CN109383051A (en) * | 2017-08-02 | 2019-02-26 | 德士达（天津）管道设备有限公司 | A kind of continuously collinearly formula spraying winding prefabricated direct-buried thermal insulation pipe production line and its application |
| CN209309492U (en) * | 2018-12-13 | 2019-08-27 | 宁夏青龙塑料管材有限公司 | A kind of expanded polystyrene (EPS) direct-burried thermal insulating plastic composite tube road |
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Application publication date: 20200428 |