CN111196069A - Joint for reinforced thermoplastic composite pipe and preparation method thereof - Google Patents
Joint for reinforced thermoplastic composite pipe and preparation method thereof Download PDFInfo
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- CN111196069A CN111196069A CN201811367308.4A CN201811367308A CN111196069A CN 111196069 A CN111196069 A CN 111196069A CN 201811367308 A CN201811367308 A CN 201811367308A CN 111196069 A CN111196069 A CN 111196069A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/162—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
- B32B2038/166—Removing moisture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0253—Polyolefin fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
- B32B2262/0269—Aromatic polyamide fibres
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- Fluid Mechanics (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a joint for a reinforced thermoplastic composite pipe and a preparation method thereof, belonging to the field of pipelines. The joint is obtained by heating and winding reinforcing cloth on the butt joint part of a target reinforced thermoplastic composite pipe; the wall of the joint comprises one or more layers of reinforcing cloth; the reinforcing cloth includes: aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth; the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth; the thickness of the polyethylene layer is 0.5-1 cm. The joint is obtained by heating the reinforcing cloth and winding the reinforcing cloth at the butt joint part of the target RTP pipe, the joint can be in heating fusion with the outer layer of the RTP pipe, the axial strength and the hoop strength are provided, and the problem of insufficient axial force of RTP pipe connection is solved. The strength of the reinforced cloth in the warp direction and the weft direction is more than 200MPa, and the elastic modulus is more than 3 GPa; the RTP pipe joint has the advantages that the connecting strength is higher than that of an RTP pipe, the toughness is good, the RTP pipe cannot be damaged, and the joint has good impact resistance, corrosion resistance and sealing property.
Description
Technical Field
The invention relates to the field of pipelines, in particular to a joint for a reinforced thermoplastic composite pipe and a preparation method thereof.
Background
Reinforced thermoplastic composite pipe (RTP) comprising, in order from the inside to the outside: the RTP pipe has the advantages that the RTP pipe has the performances of flexibility, corrosion resistance, pressure resistance, scratch resistance and the like, and is widely applied to the field of oil and gas pipelines. During the application process of the RTP pipe, two adjacent sections of RTP pipes need to be connected by using a joint.
The joint for RTP tubes provided in the related art is a steel crimping joint or an electrofusion sleeve joint.
However, the steel crimp joint has too large mass, which tends to cause stress concentration at the joint, and brittle fracture between the joint and the RTP tube tends to occur. The electric melting sleeve joint is bonded with the PE layer on the outer layer of the RTP through the Polyethylene (PE) layer of the electric melting sleeve joint and conducts force, so that the PE layer is easy to break and slip. Moreover, steel crimp joints and electrofusion sleeve joints are not suitable for large diameter RTP tubes.
Disclosure of Invention
The embodiment of the invention provides a joint for a reinforced thermoplastic composite pipe and a preparation method thereof, which can solve the technical problems. The specific technical scheme is as follows:
in one aspect, embodiments of the present invention provide a joint for reinforced thermoplastic composite pipes, the joint being obtained by heating and winding a reinforcing fabric around a butt joint portion of a target reinforced thermoplastic composite pipe;
the wall of the joint comprises one or more layers of the reinforcing cloth;
the reinforcing cloth includes: the aramid fiber fabric comprises aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth;
the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth;
the thickness of the polyethylene layer is 0.5-1 cm.
In one possible design, the polyethylene layer is bonded to the aramid fiber cloth by a bonding glue.
In one possible design, the material of the adhesive glue is ethylene-vinyl acetate copolymer.
In one possible design, the reinforcing cloth comprises a polyethylene layer, an aramid fiber cloth and a polyethylene layer which are sequentially laminated.
In another aspect, an embodiment of the present invention provides a method for preparing a joint for reinforcing a thermoplastic composite pipe, the method comprising:
preparing a reinforcing cloth, wherein the reinforcing cloth comprises: the aramid fiber fabric comprises aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth; the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth; the thickness of the polyethylene layer is 0.5-1 cm;
arranging the reinforcement in a drying box for first drying treatment;
cleaning the butt joint part of the target reinforced thermoplastic composite pipe to obtain a cleaned butt joint part;
heating the cleaned butt joint part to a first specified temperature by using an annular heating furnace;
and (3) enabling the reinforced cloth after the first drying treatment to pass through a tension roller and a preheater, then pressing the reinforced cloth on the surface of the cleaned butt joint part through a pressing roller, simultaneously controlling the rotation of the target reinforced thermoplastic composite pipe, and controlling the heating temperature of the annular heating furnace to be a second specified temperature until the reinforced cloth with a specified length is wound, thereby obtaining the joint.
In one possible design, the preparing the reinforcing cloth comprises:
heating the adhesive glue to a third designated temperature;
coating the bonding glue on the aramid fiber cloth through the anilox roller, and performing second drying treatment to obtain the aramid fiber cloth with a bonding glue layer;
bonding the bonding adhesive layer and the polyethylene layer at a fourth specified temperature and a reference bonding pressure to obtain a reinforcing cloth preposed body;
and cooling and rolling the reinforcing cloth prepositive body to obtain the reinforcing cloth.
In one possible design, the third specified temperature is 130 ℃ to 180 ℃;
the fourth designated temperature is 50-80 ℃;
the reference bonding pressure is 0.4-1.2 MPa;
the temperature of the second drying treatment is 60-80 ℃.
In one possible design, the tension of the rolling is 40-42 dyn/cm.
In one possible design, the temperature of the first drying treatment is 60-65 ℃;
the first designated temperature is 200-230 ℃;
the second specified temperature is 200-230 ℃.
In one possible design, the tension of the tension roller is 40-42 dyn/cm;
the preheating temperature of the preheater is 80-100 ℃.
In one possible design, the tension of the pressure roller is 40-42 dyn/cm.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the joint for the reinforced thermoplastic composite pipe provided by the embodiment of the invention is obtained by heating the reinforced cloth and winding the reinforced cloth on the butt joint part of the target RTP pipe, can realize heating fusion with the outer layer of the RTP pipe, provides axial strength and circumferential strength, and solves the problem of insufficient axial force of RTP pipe connection. The joint is obtained by compounding aramid fiber cloth and a polyethylene layer to form reinforced cloth, so that the longitudinal strength and the latitudinal strength of the reinforced cloth are greater than 200MPa, and the elastic modulus is greater than 3 GPa; the prepared RTP pipe joint has the advantages that the connection strength is higher than that of an RTP pipe, the toughness is good, the RTP pipe cannot be damaged, the joint has good impact resistance, corrosion resistance and sealing performance, and the joint is suitable for RTP pipes with different calibers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for making a joint according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for manufacturing a reinforcing fabric according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for preparing a joint according to an embodiment of the present invention.
Wherein the reference numerals denote:
1-the main unreeling of the reel,
2-a glue coating box, wherein the glue coating box,
3-a first drying box, wherein the first drying box,
4-a composite laminating roller, wherein the laminating roller is a roller,
5-cooling the roller, namely cooling the roller,
6-a wind-up roll, wherein the wind-up roll is arranged on the wind-up roll,
7-a second drying oven, wherein the second drying oven is provided with a drying chamber,
8-a winding wheel, wherein the winding wheel is provided with a winding wheel,
9-a tension roller for controlling the tension of the roller,
10-a pre-heater, wherein,
11-a pressure roller, wherein the pressure roller is arranged on the frame,
12-a ring-shaped heating furnace, wherein,
M-RTP pipe.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In one aspect, embodiments of the present invention provide a joint for reinforced thermoplastic composite pipes, which is obtained by heating and winding a reinforcing fabric around a butt joint portion of a target reinforced thermoplastic composite pipe; the wall of the joint comprises one or more layers of reinforcing cloth. Wherein, reinforcing cloth includes: aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth; the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth; the thickness of the polyethylene layer is 0.5-1 cm.
The joint for the reinforced thermoplastic composite pipe provided by the embodiment of the invention is obtained by heating the reinforced cloth and winding the reinforced cloth on the butt joint part of the target RTP pipe, can realize heating fusion with the outer layer of the RTP pipe, provides axial strength and circumferential strength, and solves the problem of insufficient axial force of RTP pipe connection. The joint is obtained by compounding aramid fiber cloth and a polyethylene layer to form reinforced cloth, so that the longitudinal strength and the latitudinal strength of the reinforced cloth are greater than 200MPa, and the elastic modulus is greater than 3 GPa; the prepared RTP pipe joint has the advantages that the connection strength is higher than that of an RTP pipe, the toughness is good, the RTP pipe cannot be damaged, the joint has good impact resistance, corrosion resistance and sealing performance, and the joint is suitable for RTP pipes with different calibers.
The thickness of the aramid fiber cloth and the thickness of the polyethylene layer have an important influence on the strength and toughness of the joint. In the embodiment of the invention, the thickness of the aramid fiber cloth can be 0.3cm, 0.4cm, 0.5cm and the like. The polyethylene layer can have a thickness of 0.5cm, 0.6cm, 0.7cm, 0.8cm, 0.9cm, 1cm, and the like.
So set up, through aramid fiber cloth and polyethylene layer cooperation, obtained the joint that has excellent mechanical strength and toughness, do benefit to and effectively connect RTP pipe.
The aramid fiber cloth is made of plain cloth and is matched with the polyethylene layer, so that the connector which is firm in texture, stiff and smooth in surface, light in weight, good in wear resistance and good in air permeability is favorably obtained.
The embodiment of the invention provides an example of how the polyethylene layer is firmly bonded on the aramid fiber cloth: the polyethylene layer is bonded on the aramid fiber cloth through the bonding adhesive.
The adhesive glue can be ethylene-vinyl acetate copolymer (EVA), and the EVA hot melt adhesive is a 100% solid soluble polymer which does not need a solvent and contains no water, is solid at normal temperature, and is heated and melted to a certain degree to become a liquid adhesive which can flow and is sticky. The adhesive is good, so that the polyethylene layer can be firmly bonded on the aramid fiber cloth, and the strength and toughness of the joint can be improved.
As an example, the reinforcing cloth includes: and the multilayer aramid fiber cloth and the multilayer polyethylene layer are alternately stacked.
Thus, it is advantageous to obtain a reinforcing fabric having excellent mechanical strength and elastic modulus, and further to obtain a joint having excellent mechanical strength and elastic modulus.
For example, the reinforcing cloth comprises a polyethylene layer, an aramid fiber cloth, and a polyethylene layer laminated in this order.
Therefore, the reinforced cloth with excellent mechanical strength and elastic modulus is obtained, and the joint is obtained by winding the reinforced cloth on the butt joint part of the RTP pipe.
In another aspect, an embodiment of the present invention provides a method for manufacturing a joint for reinforcing a thermoplastic composite pipe, as shown in fig. 1, the method including:
And 102, arranging the reinforcement in a drying box to perform first drying treatment.
103, cleaning the butt joint part of the target reinforced thermoplastic composite pipe to obtain the cleaned butt joint part.
And 104, heating the cleaned butt joint part to a first specified temperature by using an annular heating furnace.
And 105, enabling the reinforced cloth subjected to the first drying treatment to pass through a tension roller and a preheater, then pressing the reinforced cloth on the surface of the cleaned butt joint part through a pressing roller, simultaneously controlling the rotation of the target reinforced thermoplastic composite pipe, and controlling the heating temperature of the annular heating furnace to be a second specified temperature until the winding of the reinforced cloth with the specified length is finished, thereby obtaining the joint.
It should be noted that after the reinforcing cloth with the specified length is completely wound on the butt joint part of the target RTP tube, a joint can be formed right, so that the two sections of RTP tubes are connected right.
The preparation method of the joint for the reinforced thermoplastic composite pipe provided by the embodiment of the invention is simple, the joint can be heated and welded with the outer layer of the RTP pipe to form a whole, the joint can provide axial strength and circumferential strength, and the problem of insufficient connecting axial force of the RTP pipe is solved. The joint is obtained by compounding aramid fiber cloth and a polyethylene layer, so that the longitudinal strength and the latitudinal strength of the reinforced cloth are greater than 200MPa, and the elastic modulus is greater than 3 GPa; the prepared RTP pipe joint has the advantages that the connection strength is higher than that of an RTP pipe, the toughness is good, the RTP pipe cannot be damaged, the joint has good impact resistance, corrosion resistance and sealing performance, and the joint is suitable for RTP pipes with different calibers.
The preparation method of the joint for reinforcing the thermoplastic composite pipe provided by the embodiment of the present invention is explained in detail as follows:
in step 101, a reinforced fabric may be prepared by a dry-type composite method, which is a process of gluing and drying the pretreated aramid fiber fabric, and then adhering the aramid fiber fabric to a polyethylene layer at a certain temperature and pressure.
Specifically, a reinforced cloth is prepared, comprising:
step 1011, heat the adhesive to a third designated temperature.
The third predetermined temperature is 130 ℃ to 180 ℃, and may be 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃ or the like, for example.
So, can make bonding glue fully melt to do benefit to and coat to aramid fiber cloth.
And 1012, coating bonding glue on the aramid fiber cloth through an anilox roller, and performing second drying treatment to obtain the aramid fiber cloth with a bonding glue layer.
The adhesive glue can be uniformly coated on the aramid fiber cloth through the anilox roller, so that the adhesive glue layer on the aramid fiber cloth is uniform.
The temperature of the second drying treatment may be 60 to 80 ℃, and for example, 60 ℃, 63 ℃, 65 ℃, 67 ℃, 69 ℃, 70 ℃, 71 ℃, 73 ℃, 75 ℃, 77 ℃, 79 ℃, 80 ℃ or the like may be used.
Therefore, the bonding glue layer can be formed on the surface of the aramid fiber cloth.
And 1013, attaching the adhesive layer and the polyethylene layer at a fourth specified temperature and a reference attaching pressure to obtain the reinforcement fabric precursor.
Wherein the fourth predetermined temperature is 50 ℃ to 80 ℃, and may be, for example, 50 ℃, 53 ℃, 57 ℃, 59 ℃, 60 ℃, 61 ℃, 63 ℃, 65 ℃, 67 ℃, 69 ℃, 70 ℃, 71 ℃, 73 ℃, 75 ℃, 77 ℃, 79 ℃, 80 ℃ or the like.
The reference bonding pressure is 0.4 to 1.2MPa, and may be, for example, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, 1.1MPa, 1.2MPa, or the like.
So set up, can make aramid fiber cloth, bonding glue film, polyethylene layer can laminate firmly to form reinforcing cloth fore-posed body.
And 1014, cooling and rolling the reinforcing cloth prepositive body to obtain the reinforcing cloth.
By cooling the reinforcing fabric pre-body, the state of the obtained reinforcing fabric can be stabilized.
Wherein the tension of the rolling is 40-42 dyn/cm, such as 40dyn/cm, 40.5dyn/cm, 41dyn/cm, 41.5dyn/cm, 42dyn/cm, etc.
So set up the tension of rolling, not only can accomodate reinforcing cloth, make reinforcing cloth regularization, can not influence the mechanical strength and the elastic modulus of reinforcing cloth yet.
For the preparation of the reinforcing fabric, an apparatus for preparing the reinforcing fabric as shown in fig. 2 may be used, the apparatus comprising: the main unreeling device comprises a main unreeling 1, a gluing box 2, a first drying box 3, a composite laminating roller 4, a cooling roller 5, a wind-up roller 6 and a second drying box 7.
Specifically, aramid fiber cloth unreels 1 by owner and exports to gluing case 2 in and carry out the gluing of bonding glue, and aramid fiber cloth after the rubber coating gets into and exports to compound laminating roller 4 in first drying cabinet 3 after the drying, and second drying cabinet 7 exports to compound laminating roller 4 after to the polyethylene layer is dry, through 4 pressfittings of compound laminating roller, obtains reinforcing cloth fore-mounted body. And cooling the reinforcing cloth prepositive body by a cooling roller 5, and finally rolling by a rolling roller 6 to obtain the reinforcing cloth.
Wherein, the main unreeling 1, the composite attaching roller 4, the cooling roller 5 and the reeling roller 6 can control the rotating speed thereof through the motor.
In step 102, the reinforcement is placed in a drying oven for drying to evaporate water thereon, which facilitates the later reinforcement cloth to be firmly wound on the RTP tube.
The temperature of the first drying treatment is, for example, 60 ℃ to 65 ℃, and may be, for example, 60 ℃, 61 ℃, 62 ℃, 63 ℃, 64 ℃, 65 ℃.
In step 103, impurities, dirt, and oil stains at the joint of the RTP tubes need to be removed to obtain a clean joint, which is favorable for the stable connection between the joint and the RTP tubes.
In step 104, the cleaned butt-jointed portion is heated to a first predetermined temperature by using an annular heating furnace, wherein the first predetermined temperature may be 200 ℃ to 230 ℃, for example, 200 ℃, 205 ℃, 210 ℃, 215 ℃, 220 ℃, 225 ℃, 230 ℃, and the like.
Thus, when the reinforcing cloth is adhered to the RTP pipe, the polyethylene layer and the adhesive glue in the reinforcing cloth are softened and firmly adhered to the RTP pipe.
In step 105, the reinforcing fabric after the first drying process is stretched by a tension roller and preheated by a preheater, and then the adhesive glue and the polyethylene layer on the reinforcing fabric are softened, so that the reinforcing fabric is favorably pressed to the surface of the cleaned butt joint part, and simultaneously, the target RTP pipe is controlled to rotate, and the heating temperature of the annular heating furnace is controlled to be the second specified temperature until the reinforcing fabric with the specified length is wound.
The tension of the tension roller is 40 to 42dyn/cm, and may be 40dyn/cm, 40.5dyn/cm, 41dyn/cm, 41.5dyn/cm, 42dyn/cm, or the like.
The preheating temperature of the preheater is 80 to 100 ℃, and may be, for example, 80 ℃, 81 ℃, 83 ℃, 85 ℃, 87 ℃, 89 ℃, 90 ℃, 91 ℃, 93 ℃, 95 ℃, 97 ℃, 99 ℃, 100 ℃ or the like.
The tension of the pressure roller is 40 to 42dyn/cm, and may be, for example, 40dyn/cm, 40.5dyn/cm,
41dyn/cm, 41.5dyn/cm, 42dyn/cm, and the like.
With such an arrangement, the reinforcing cloth can be firmly bonded to the butt joint portion of the target RTP tube.
The second predetermined temperature is 200 ℃ to 230 ℃, and may be, for example, 200 ℃, 203 ℃, 207 ℃, 210 ℃, 213 ℃, 217 ℃, 220 ℃, 223 ℃, 227 ℃, 230 ℃, or the like.
For the preparation of joints for reinforced thermoplastic composite pipes, an apparatus for preparing joints as shown in fig. 3 may be used, the apparatus comprising: a winding wheel 8, a tension roller 9, a preheater 10, a compression roller 11 and an annular heating furnace 12. Wherein the annular heating furnace 12 is used for heating the end of the target RTP tube M. After the winding wheel 8 outputs the reinforcing cloth, the reinforcing cloth is output to the target RTP pipe M through the tension roller 9, and then the reinforcing cloth is pressed on the target RTP pipe M through the pressing roller 11. Wherein, the preheater 10 is positioned between the tension roller 9 and the compression roller 11 to preheat the reinforcing cloth compressed on the target RTP pipe M.
In the above winding process, the winding wheel 8, the tension roller 9, the pinch roller 11, and the target RTP tube M may be rotated by a motor.
Wherein, the annular heating furnace 12 can be an infrared annular heating furnace.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A joint for reinforced thermoplastic composite pipes, wherein the joint is obtained by heating and winding a reinforcing cloth around a butt joint portion of a target reinforced thermoplastic composite pipe;
the wall of the joint comprises one or more layers of the reinforcing cloth;
the reinforcing cloth includes: the aramid fiber fabric comprises aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth;
the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth;
the thickness of the polyethylene layer is 0.5-1 cm.
2. The joint of claim 1 wherein the polyethylene layer is bonded to the aramid fiber cloth by an adhesive.
3. The joint of claim 2, wherein the adhesive is an ethylene-vinyl acetate copolymer.
4. The joint of claim 1, wherein the reinforcing cloth comprises a polyethylene layer, an aramid fiber cloth, and a polyethylene layer laminated in this order.
5. A method of making a joint for reinforced thermoplastic composite pipe, the method comprising:
preparing a reinforcing cloth, wherein the reinforcing cloth comprises: the aramid fiber fabric comprises aramid fiber cloth and a polyethylene layer bonded on the aramid fiber cloth; the thickness of the aramid fiber cloth is 0.3-0.5 cm, and the aramid fiber cloth is plain cloth; the thickness of the polyethylene layer is 0.5-1 cm;
arranging the reinforcement in a drying box for first drying treatment;
cleaning the butt joint part of the target reinforced thermoplastic composite pipe to obtain a cleaned butt joint part;
heating the cleaned butt joint part to a first specified temperature by using an annular heating furnace;
and (3) enabling the reinforced cloth after the first drying treatment to pass through a tension roller and a preheater, then pressing the reinforced cloth on the surface of the cleaned butt joint part through a pressing roller, simultaneously controlling the rotation of the target reinforced thermoplastic composite pipe, and controlling the heating temperature of the annular heating furnace to be a second specified temperature until the reinforced cloth with a specified length is wound, thereby obtaining the joint.
6. The method for preparing a reinforcing fabric according to claim 5, wherein the preparing of the reinforcing fabric comprises:
heating the adhesive glue to a third designated temperature;
coating the bonding glue on the aramid fiber cloth through the anilox roller, and performing second drying treatment to obtain the aramid fiber cloth with a bonding glue layer;
bonding the bonding adhesive layer and the polyethylene layer at a fourth specified temperature and a reference bonding pressure to obtain a reinforcing cloth preposed body;
and cooling and rolling the reinforcing cloth prepositive body to obtain the reinforcing cloth.
7. The method of claim 6, wherein the third specified temperature is 130 ℃ to 180 ℃;
the fourth designated temperature is 50-80 ℃;
the reference bonding pressure is 0.4-1.2 MPa;
the temperature of the second drying treatment is 60-80 ℃.
8. The preparation method according to claim 6, wherein the tension of the rolling is 40-42 dyn/cm.
9. The preparation method according to claim 5, wherein the temperature of the first drying treatment is 60 ℃ to 65 ℃;
the first designated temperature is 200-230 ℃;
the second specified temperature is 200-230 ℃.
10. The production method according to claim 5, wherein the tension of the tension roller is 40 to 42 dyn/cm;
the preheating temperature of the preheater is 80-100 ℃;
the tension of the compression roller is 40-42 dyn/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811367308.4A CN111196069A (en) | 2018-11-16 | 2018-11-16 | Joint for reinforced thermoplastic composite pipe and preparation method thereof |
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Cited By (2)
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| CN113400696A (en) * | 2021-06-26 | 2021-09-17 | 宜宾学院 | Method for connecting large-caliber high-pressure fiber reinforced flexible composite pipe |
| CN114536725A (en) * | 2022-03-14 | 2022-05-27 | 四川慧科合创机械技术有限公司 | Manufacturing device and manufacturing method for continuous fiber reinforced thermoplastic composite pipe fitting |
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