阅读说明：本技术 一种高强度耐压聚乙烯复合管及其制备方法 (High-strength pressure-resistant polyethylene composite pipe and preparation method thereof ) 是由 刘俊峰 刘文江 李国庆 汪进南 万刚 汪燕飞 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种高强度耐压聚乙烯复合管及其制备方法,该复合管包括芯管、薄片骨架增强层以及外表层；所述芯管和外表层之间设置有薄片骨架增强层；本发明通过与薄片紧密结合,使其具有良好的强度和韧性,复合管的内外两层包覆有改性聚乙烯材料,使其具有较高的拉伸强度、弯曲强度、高模量和高抗冲击性能；通过第一弹簧的设置,使其在在自然的状态下,整平辊与薄片相抵触,薄片通过整平辊与芯管间的间隙被压紧至平整状态在缠绕在芯管；通过打磨机构的设置,便于对不厚度的薄片进行打磨,使其更加光滑平整,粘结效果好；通过压紧机构的设置,便于对不同厚度的薄片进行挤压,使其更加平整。(The invention discloses a high-strength pressure-resistant polyethylene composite pipe and a preparation method thereof, wherein the composite pipe comprises a core pipe, a sheet framework reinforcing layer and an outer surface layer; a thin sheet framework reinforcing layer is arranged between the core pipe and the outer surface layer; the composite pipe has good strength and toughness by being tightly combined with the sheets, and the inner layer and the outer layer of the composite pipe are coated with the modified polyethylene material, so that the composite pipe has high tensile strength, bending strength, high modulus and high impact resistance; through the arrangement of the first spring, the leveling roller is enabled to be in contact with the thin sheet in a natural state, and the thin sheet is tightly pressed to be in a flat state through a gap between the leveling roller and the core pipe and is wound on the core pipe; through the arrangement of the polishing mechanism, the polishing of thin slices with different thicknesses is facilitated, so that the thin slices are smoother and smoother, and the bonding effect is good; through the arrangement of the pressing mechanism, the thin slices with different thicknesses are conveniently extruded, so that the thin slices are smoother.)

1. A high-strength pressure-resistant polyethylene composite pipe is characterized by comprising a core pipe, a thin sheet framework reinforcing layer and an outer surface layer; a thin sheet framework reinforcing layer is arranged between the core pipe and the outer surface layer;

the core pipe and the outer surface layer are made of the same materials and are prepared from the following raw materials in parts by weight: 190 parts of polyethylene 180-one material, 35-40 parts of chlorinated polyethylene, 75-85 parts of epoxy resin, 8-9 parts of dibutyltin dilaurate, 7-10 parts of calcium stearate, 9-11 parts of polyethylene wax, 7-9 parts of jade powder, 6-8 parts of barium laurate, 8-10 parts of alkyl phosphoric acid, 5-9 parts of fluorine resin, 6-7 parts of glycidyl methacrylate, 10-15 parts of silane coupling agent, 11-16 parts of polyethylene glycol terephthalate, 13-15 parts of phosphite antioxidant, 11-13 parts of nano zirconium dioxide and 9-11 parts of auxiliary master batch;

the composite pipe is prepared by the following steps: fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of the pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller to form a sheet framework enhancement layer; and finally, forming an outer polyethylene pipe on the outer surface of the reinforcing layer of the sheet framework, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

2. The high-strength pressure-resistant polyethylene composite pipe according to claim 1, wherein the auxiliary agent masterbatch is prepared from the following raw materials in parts by weight: 30-36 parts of polyamide, 12-14 parts of butyl naphthenate, 7-9 parts of dimethyl fumarate, 6-8 parts of sodium benzoate, 9-10 parts of superfine carbon black, 5-7 parts of lead tribasic phthalate, 13-15 parts of nano silicon dioxide, 3-5 parts of ethylene distearamide, 4-6 parts of magnesium laurate, 8-9 parts of pentaerythritol ester, 6-8 parts of benzoate and 10-12 parts of antioxidant CA.

3. The high-strength pressure-resistant polyethylene composite pipe according to claim 2, wherein the preparation method of the auxiliary agent masterbatch comprises: respectively grinding superfine carbon black, lead tribasic phthalate, nano silicon dioxide and magnesium laurate into powder, mixing, adding other residual components such as polyamide, butyl naphthenate, dimethyl fumarate and the like, putting into a kneader, kneading at the temperature of 80-90 ℃ for 50-60 minutes, naturally cooling, feeding into a granulator, and carrying out melt extrusion granulation to obtain the required auxiliary agent master batch.

4. The preparation method of the high-strength pressure-resistant polyethylene composite pipe is characterized by comprising the following steps:

(1) weighing 190 parts of 180-parts of polyethylene, 35-40 parts of chlorinated polyethylene, 75-85 parts of epoxy resin, 8-9 parts of dibutyltin dilaurate, 7-10 parts of calcium stearate, 9-11 parts of polyethylene wax, 7-9 parts of jade powder, 6-8 parts of barium laurate, 8-10 parts of alkyl phosphoric acid, 5-9 parts of fluorine resin, 6-7 parts of glycidyl methacrylate, 10-15 parts of a silane coupling agent, 11-16 parts of polyethylene glycol terephthalate, 13-15 parts of a phosphite antioxidant, 11-13 parts of nano zirconium dioxide and 9-11 parts of an auxiliary master batch;

(2) mixing the raw materials except the epoxy resin, adding the mixture into a high-speed kneader, kneading for 8-10 minutes at the kneading temperature of 160-180 ℃, then feeding the raw materials into a cold mixer, stirring until the temperature is 35-40 ℃, and then discharging;

(3) putting the raw materials obtained in the step (2) into hoppers of a core pipe polyethylene pipe screw extruder and an outer layer polyethylene pipe extruder respectively according to a proportion, extruding polyethylene by the core pipe polyethylene pipe screw extruder, entering a core pipe polyethylene pipe mould for molding, and obtaining a core pipe through vacuum sizing and cooling;

(4) fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of the pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller to form a sheet framework enhancement layer;

(5) and extruding polyethylene by an outer polyethylene pipe extruding machine, entering an outer polyethylene pipe die, forming an outer polyethylene pipe on the outer surface of the thin sheet framework reinforcing layer, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

5. The method for preparing the high-strength and pressure-resistant polyethylene composite pipe according to claim 4, wherein the clamping mechanism comprises the following working steps: the second cylinder is driven to drive the motor to move, and then one clamping mechanism is driven to move, then the core pipe is inserted into the annular groove, the fifth cylinder is driven to work, the first arc-shaped block is driven to move, under the reaction force of the third spring, the first arc-shaped block is matched with the second arc-shaped block to fix one end of the core pipe, the motor resets, and then two ends of the core pipe are fixed through the two clamping mechanisms.

6. The method for preparing the high-strength and pressure-resistant polyethylene composite pipe according to claim 4, wherein the operation steps of the pressing mechanism are as follows: the third cylinder is driven, the piston rod drives the connecting block to ascend and descend, the movable plate is driven to ascend and descend, the movable plate is guided through the first guide rod, and the height of the upper compression roller is adjusted.

7. The method for preparing the high-strength and pressure-resistant polyethylene composite pipe according to claim 4, wherein the grinding mechanism comprises the following working steps: the fourth cylinder is driven to drive the rocker arm to move through the piston rod, so that the movable block moves horizontally, the sliding plate is pushed to slide through the second spring, the second polishing roller is pushed to move, and the distance between the second polishing roller and the first polishing roller is adjusted.

8. The method for preparing the high-strength and pressure-resistant polyethylene composite pipe according to claim 4, wherein the leveling roller comprises the following working steps: the first cylinder is driven to work, the cross beam is driven to ascend and descend, the leveling roller is abutted to the thin sheet when the first spring is in a natural state, and the thin sheet is compressed to be in a leveling state through a gap between the leveling roller and the core pipe and is wound on the core pipe in the winding process.

Technical Field

The invention relates to the technical field of composite pipes, in particular to a high-strength pressure-resistant polyethylene composite pipe and a preparation method thereof.

Background

Traditional steel pipelines are poor in corrosion resistance and difficult to carry, and cannot meet the current requirements. The main petroleum and natural gas in China are mostly distributed in deserts, swamps or mountain areas, the natural environment is severe, the steel pipelines are seriously influenced by the natural environment when being laid, and the conveying pipelines are extremely easy to damage due to ground settlement, mountain landslide and other reasons;

a heat-resistant polyethylene composite pipe and a preparation method thereof are disclosed in the patent No. CN 102767652B; however, the polyethylene made pipe is sensitive to chemical and mechanical action, has poor thermal aging resistance, and cannot be applied in some fields; in the winding process in the prior art, the sheets cannot be flatly pressed on the core pipe, and the sheets with different thicknesses are not convenient to grind and extrude.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a high-strength pressure-resistant polyethylene composite pipe and a preparation method thereof,

the composite pipe is formed by compounding the core pipe, the sheet framework reinforcing layer and the outer surface layer, has good strength and toughness by being tightly combined with the sheet, and has higher tensile strength, bending strength, high modulus and high impact resistance because the inner layer and the outer layer of the composite pipe are coated with the modified polyethylene material.

According to the invention, through the arrangement of the first spring, the leveling roller is enabled to be in contact with the thin sheet in a natural state, and the thin sheet is tightly pressed to be in a flat state through a gap between the leveling roller and the core pipe and is wound on the core pipe; through the arrangement of the polishing mechanism, the polishing of thin slices with different thicknesses is facilitated, so that the thin slices are smoother and smoother, and the bonding effect is good; through the arrangement of the pressing mechanism, the thin slices with different thicknesses are conveniently extruded, so that the thin slices are smoother.

The purpose of the invention can be realized by the following technical scheme:

a high-strength pressure-resistant polyethylene composite pipe comprises a core pipe, a thin sheet framework reinforcing layer and an outer surface layer; a thin sheet framework reinforcing layer is arranged between the core pipe and the outer surface layer;

the core pipe and the outer surface layer are made of the same materials and are prepared from the following raw materials in parts by weight: 190 parts of polyethylene 180-one material, 35-40 parts of chlorinated polyethylene, 75-85 parts of epoxy resin, 8-9 parts of dibutyltin dilaurate, 7-10 parts of calcium stearate, 9-11 parts of polyethylene wax, 7-9 parts of jade powder, 6-8 parts of barium laurate, 8-10 parts of alkyl phosphoric acid, 5-9 parts of fluorine resin, 6-7 parts of glycidyl methacrylate, 10-15 parts of silane coupling agent, 11-16 parts of polyethylene glycol terephthalate, 13-15 parts of phosphite antioxidant, 11-13 parts of nano zirconium dioxide and 9-11 parts of auxiliary master batch;

the composite pipe is prepared by the following steps: fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of a pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller; and finally, forming an outer polyethylene pipe on the outer surface of the reinforcing layer of the sheet framework, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

A preparation method of a high-strength pressure-resistant polyethylene composite pipe comprises the following steps:

(1) weighing 190 parts of 180-parts of polyethylene, 35-40 parts of chlorinated polyethylene, 75-85 parts of epoxy resin, 8-9 parts of dibutyltin dilaurate, 7-10 parts of calcium stearate, 9-11 parts of polyethylene wax, 7-9 parts of jade powder, 6-8 parts of barium laurate, 8-10 parts of alkyl phosphoric acid, 5-9 parts of fluorine resin, 6-7 parts of glycidyl methacrylate, 10-15 parts of a silane coupling agent, 11-16 parts of polyethylene glycol terephthalate, 13-15 parts of a phosphite antioxidant, 11-13 parts of nano zirconium dioxide and 9-11 parts of an auxiliary master batch;

(2) mixing the raw materials except the epoxy resin, adding the mixture into a high-speed kneader, kneading for 8-10 minutes at the kneading temperature of 160-180 ℃, then feeding the raw materials into a cold mixer, stirring until the temperature is 35-40 ℃, and then discharging;

(3) putting the raw materials obtained in the step (2) into hoppers of a core pipe polyethylene pipe screw extruder and an outer layer polyethylene pipe extruder respectively according to a proportion, extruding polyethylene by the core pipe polyethylene pipe screw extruder, entering a core pipe polyethylene pipe mould for molding, and obtaining a core pipe through vacuum sizing and cooling;

(4) fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of a pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller;

(5) and extruding polyethylene by an outer polyethylene pipe extruding machine, entering an outer polyethylene pipe die, forming an outer polyethylene pipe on the outer surface of the thin sheet framework reinforcing layer, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

As a further scheme of the invention: the auxiliary master batch is prepared from the following raw materials in parts by weight: 30-36 parts of polyamide, 12-14 parts of butyl naphthenate, 7-9 parts of dimethyl fumarate, 6-8 parts of sodium benzoate, 9-10 parts of superfine carbon black, 5-7 parts of lead tribasic phthalate, 13-15 parts of nano silicon dioxide, 3-5 parts of ethylene distearamide, 4-6 parts of magnesium laurate, 8-9 parts of pentaerythritol ester, 6-8 parts of benzoate and 10-12 parts of antioxidant CA.

As a further scheme of the invention: the preparation method of the auxiliary agent master batch comprises the following steps: respectively grinding superfine carbon black, lead tribasic phthalate, nano silicon dioxide and magnesium laurate into powder, mixing, adding other residual components such as polyamide, butyl naphthenate, dimethyl fumarate and the like, putting into a kneader, kneading at the temperature of 80-90 ℃ for 50-60 minutes, naturally cooling, feeding into a granulator, and carrying out melt extrusion granulation to obtain the required auxiliary agent master batch.

As a further scheme of the invention: the working steps of the clamping mechanism are as follows: the second cylinder is driven to drive the motor to move, and then one clamping mechanism is driven to move, then the core pipe is inserted into the annular groove, the fifth cylinder is driven to work, the first arc-shaped block is driven to move, under the reaction force of the third spring, the first arc-shaped block is matched with the second arc-shaped block to fix one end of the core pipe, the motor resets, and then two ends of the core pipe are fixed through the two clamping mechanisms.

As a further scheme of the invention: the working steps of the pressing mechanism are as follows: the third cylinder is driven, the piston rod drives the connecting block to ascend and descend, the movable plate is driven to ascend and descend, the movable plate is guided through the first guide rod, and the height of the upper compression roller is adjusted.

As a further scheme of the invention: the working steps of the grinding mechanism are as follows: the fourth cylinder is driven to drive the rocker arm to move through the piston rod, so that the movable block moves horizontally, the sliding plate is pushed to slide through the second spring, the second polishing roller is pushed to move, and the distance between the second polishing roller and the first polishing roller is adjusted.

As a further scheme of the invention: the working steps of the leveling roller are as follows: the first cylinder is driven to work, the cross beam is driven to ascend and descend, the leveling roller is abutted to the thin sheet when the first spring is in a natural state, and the thin sheet is compressed to be in a leveling state through a gap between the leveling roller and the core pipe and is wound on the core pipe in the winding process.

As a further scheme of the invention: the winding machine comprises a base, wherein one end of the top of the base is fixedly and rotatably connected with an unwinding roller, a winding sheet is sleeved on the unwinding roller, a first support and a second support are symmetrically and parallelly installed at the other end of the top of the base, first air cylinders are fixedly installed on the inner sides of the first support and the second support, a cross beam is fixedly installed at the bottom of the first air cylinder, two sides of the cross beam are respectively and slidably connected with the first support and the second support, a plurality of first springs are uniformly installed at the bottom of the cross beam, a U-shaped plate is fixedly installed at the bottom of the first springs, and a leveling roller is rotatably connected to the bottom of the U-shaped plate;

a motor support is fixedly mounted on the outer side of the first support, a second air cylinder is fixedly mounted at the top of the motor support, a piston rod of the second air cylinder is fixedly connected with one end of a motor, the bottom of the motor is slidably connected with the motor support, an output shaft of the motor penetrates through the first support and is fixedly connected with a first clamping mechanism, one end, far away from the first support, of the first clamping mechanism is connected with a core pipe, one end, far away from the first clamping mechanism, of the core pipe is connected with a second clamping mechanism, and the second clamping mechanism is rotatably connected with the first support;

the second clamping mechanism and the first clamping mechanism respectively comprise a fixed disc, an annular groove, fifth air cylinders, first arc-shaped blocks, second arc-shaped blocks, third springs and supporting columns, the supporting columns are fixedly installed at the centers of one surfaces of the fixed disc, a plurality of third springs are uniformly installed on the periphery of the supporting columns, the second arc-shaped blocks are fixedly installed at one ends, far away from the supporting columns, of the third springs, the second arc-shaped blocks form a circle, the outer diameter of each second arc-shaped block is overlapped with the inner diameter of the annular groove formed in the fixed disc, the fixed disc is provided with a plurality of fifth air cylinders, piston rods of the fifth air cylinders are fixedly connected with the first arc-shaped blocks, the first arc-shaped blocks form a circle, and the inner diameter of each first arc-shaped block is overlapped with the outer diameter of;

the middle of the top of the base is symmetrically and parallelly provided with two side plates, a plurality of guide rollers for guiding thin sheets are sequentially arranged between the two side plates, a pressing mechanism is fixedly arranged between the two side plates and at one end close to the unwinding roller, the pressing mechanism comprises a transverse plate, a third cylinder, a connecting block, a movable plate, a first guide rod and an upper press roller, the transverse plate is fixed on the side plates, the third cylinder is fixedly arranged at the center of the top of the transverse plate, a piston rod of the third cylinder penetrates through the transverse plate and is connected with the connecting block, the connecting block is rotatably connected with the upper press roller, the first guide rods are arranged on two sides of the third cylinder, the penetrating transverse plate of the first guide rod is connected with the movable plate, and a lower press roller is rotatably connected under the upper press roller;

the polishing mechanism is fixedly arranged at the center of the two side plates and comprises a mounting seat, a fourth air cylinder, a rocker arm, a movable block, a first sliding groove, a second spring, a second guide rod, a sliding plate, a second sliding groove and a second polishing roller, the mounting seat is fixed on the side plates, one side of the mounting seat is movably connected with the fourth air cylinder, a piston rod of the fourth air cylinder is movably connected with the rocker arm, one end of the rocker arm, far away from the piston rod, is movably connected with the movable block, the movable block is of a convex structure, the movable block is provided with the first sliding groove, the first sliding groove is matched with the side plates to drive the movable block to slide, the two second guide rods penetrate through the movable block to be connected with the sliding plate, the second spring is sleeved on the second guide rods, the sliding plate is provided with the second sliding groove, the second sliding groove is matched with the side plates to drive the sliding plate to slide, and the sliding plate, a first grinding roller is rotatably connected under the second grinding roller;

and a glue spreading roller is installed on one side of the grinding mechanism, and a heating roller is arranged on one side of the glue spreading roller.

The invention has the beneficial effects that: the composite pipe is formed by compounding the core pipe, the thin-sheet framework reinforcing layer and the outer surface layer, has good strength and high toughness, the inner layer and the outer layer of the composite pipe are coated with the modified polyethylene material, the polyethylene is odorless and nontoxic, the hand feeling is similar to wax, the composite pipe has excellent low-temperature resistance, good chemical stability and can resist corrosion of most of acid and alkali; is insoluble in water at room temperatureA general solvent, which has low water absorption and excellent electrical insulation; the material has higher tensile strength, bending strength, high modulus and high impact resistance; the composite pipe is tightly combined with the thin sheet, so that the composite pipe has good strength and toughness, the production process of the composite pipe is greatly simplified, the production efficiency is improved, and the cost is reduced; the flame retardance of the composite pipe can reach V-1 grade, and the adhesive force is 65N/10mm³Peel strength 145N/m;

in the process of bonding the sheet and the core tube, firstly, the core tube is fixed between two clamping mechanisms of a winding machine, a second air cylinder is driven to drive a motor to move so as to drive a first clamping mechanism to move leftwards, then, the core tube is inserted into an annular groove, a fifth air cylinder is driven to work so as to drive a first arc-shaped block to move rightwards, under the reaction force of a third spring, the first arc-shaped block is matched with a second arc-shaped block to fix one end of the core tube, then, the motor is driven to reset, and then, the other end of the core tube is fixed through the second clamping mechanism; placing the coiled sheet on an unwinding roller, winding one end of the sheet on a core pipe, driving a motor, and driving the core pipe to rotate through a first clamping mechanism; the thin slice is at first extruded through last compression roller and the lower compression roller on the curb plate of hold-down mechanism, flatten it, then polish it through the second grinding roller of grinding mechanism and the first grinding roller on the curb plate once more, make it smoother, then coat epoxy on the thin slice through the glue spreader, the warming mill heats the thin slice, avoid epoxy cooling, be difficult for gluing, at last the rolling is twined on the core pipe, and pave the thin slice on the core pipe smoothly through the leveling roller, drive first cylinder work, drive the crossbeam and rise and descend, make first spring under the state of nature, the leveling roller is inconsistent with the thin slice, the thin slice is at the in-process of rolling, under the effort of first spring, the thin slice is compressed tightly to the flat state through the clearance between leveling roller and the core pipe and is twined at the core pipe at the level.

The third cylinder of drive drives the connecting block through the piston rod and goes up and down, and then drives fly leaf and last compression roller and go up and down, and the fly leaf leads through first guide bar, adjusts the height of going up the compression roller, is convenient for extrude the thin slice of different thickness, and application scope is wide, and the practicality is strong.

The fourth cylinder of drive drives the rocking arm motion through the piston rod, and then the movable block horizontal migration promotes the sliding plate through the second spring and slides, and then promotes the second roller of polishing and removes, adjusts its and first roller of polishing interval between, is convenient for polish the thin slice of different thickness, and the setting of second spring makes the second roller of polishing have good resiliency, is favorable to polishing the protrusion on the thin slice.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of a winding machine of the present invention;

FIG. 2 is a schematic top view of the winding machine of the present invention;

FIG. 3 is a schematic view of the overall construction of the grinding mechanism of the present invention;

FIG. 4 is a schematic view of the overall structure of the pressing mechanism of the present invention;

FIG. 5 is a side view of the bracket of the present invention;

fig. 6 is a schematic view of the clamping mechanism of the present invention.

In the figure: 1. a base; 2. unwinding rollers; 3. a sheet; 4. a hold-down mechanism; 5. a lower pressing roller; 6. a side plate; 7. a polishing mechanism; 8. a first grinding roller; 9. a guide roller; 10. glue spreading roller; 11. a first bracket; 12. a cross beam; 13. a first cylinder; 14. a second bracket; 15. a core tube; 16. a first clamping mechanism; 17. a leveling roller; 18. a U-shaped plate; 19. a first spring; 20. a second cylinder; 21. a motor bracket; 22. a motor; 23. a second clamping mechanism; 24. a heating roller; 41. a transverse plate; 42. a third cylinder; 43. connecting blocks; 44. a movable plate; 45. a first guide bar; 46. an upper compression roller; 71. a mounting seat; 72. a fourth cylinder; 73. a rocker arm; 74. a movable block; 75. a first chute; 76. a second spring; 77. a second guide bar; 78. a sliding plate; 79. a second chute; 70. a second grinding roller; 161. fixing the disc; 162. an annular groove; 163. a fifth cylinder; 164. a first arc-shaped block; 165. a second arc-shaped block; 166. a third spring; 167. and a support pillar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a high strength pressure resistant polyethylene composite pipe includes a core pipe, a sheet skeleton reinforcing layer and an outer surface layer; a thin sheet framework reinforcing layer is arranged between the core pipe and the outer surface layer;

the core pipe and the outer surface layer are made of the same materials and are prepared from the following raw materials in parts by weight: 190 parts of polyethylene, 40 parts of chlorinated polyethylene, 85 parts of epoxy resin, 9 parts of dibutyltin dilaurate, 10 parts of calcium stearate, 11 parts of polyethylene wax, 9 parts of jade powder, 8 parts of barium laurate, 10 parts of alkyl phosphoric acid, 9 parts of fluorine resin, 7 parts of glycidyl methacrylate, 15 parts of silane coupling agent, 16 parts of polyethylene terephthalate, 15 parts of phosphite antioxidant, 13 parts of nano zirconium dioxide and 11 parts of auxiliary agent master batch;

the composite pipe is prepared by the following steps: fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of a pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller; and finally, forming an outer polyethylene pipe on the outer surface of the reinforcing layer of the sheet framework, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

A preparation method of a high-strength pressure-resistant polyethylene composite pipe comprises the following steps:

(1) weighing 190 parts by weight of polyethylene, 40 parts by weight of chlorinated polyethylene, 85 parts by weight of epoxy resin, 9 parts by weight of dibutyltin dilaurate, 10 parts by weight of calcium stearate, 11 parts by weight of polyethylene wax, 9 parts by weight of jade powder, 8 parts by weight of barium laurate, 10 parts by weight of alkyl phosphoric acid, 9 parts by weight of fluorine ester, 7 parts by weight of glycidyl methacrylate, 15 parts by weight of silane coupling agent, 16 parts by weight of polyethylene terephthalate, 15 parts by weight of phosphite antioxidant, 13 parts by weight of nano zirconium dioxide and 11 parts by weight of auxiliary agent;

(2) mixing the raw materials except the epoxy resin, adding the mixture into a high-speed kneader, kneading for 10 minutes at the kneading temperature of 180 ℃, then feeding the raw materials into a cold mixer, stirring until the temperature is 40 ℃, and then discharging;

(3) putting the raw materials obtained in the step (2) into hoppers of a core pipe polyethylene pipe screw extruder and an outer layer polyethylene pipe extruder respectively according to a proportion, extruding polyethylene by the core pipe polyethylene pipe screw extruder, entering a core pipe polyethylene pipe mould for molding, and obtaining a core pipe through vacuum sizing and cooling;

(4) fixing a core pipe between two clamping mechanisms of a winding machine, placing a coiled sheet on an unwinding roller, winding one end of the sheet on the core pipe, driving a motor, driving the core pipe to rotate through the two clamping mechanisms, extruding the sheet by an upper compression roller of a pressing mechanism and a lower compression roller of a side plate, polishing the sheet by a second polishing roller of a polishing mechanism and a first polishing roller of the side plate, coating epoxy resin on the sheet by a glue coating roller, heating the sheet by the heating roller, winding the sheet on the core pipe, and flatly paving the sheet on the core pipe by a leveling roller;

(5) and extruding polyethylene by an outer polyethylene pipe extruding machine, entering an outer polyethylene pipe die, forming an outer polyethylene pipe on the outer surface of the thin sheet framework reinforcing layer, and continuously spraying water to the outer layer for cooling to obtain the composite pipe.

The auxiliary master batch is prepared from the following raw materials in parts by weight: polyamide 36, butyl naphthenate 14, dimethyl fumarate 9, sodium benzoate 8, superfine carbon black 10, tribasic lead phthalate 7, nano-silica 15, ethylene distearamide 5, magnesium laurate 6, pentaerythritol ester 9, benzoate 8 and antioxidant CA 12.

The preparation method of the auxiliary agent master batch comprises the following steps: grinding superfine carbon black, lead tribasic phthalate, nano silicon dioxide and magnesium laurate into powder respectively, mixing, adding other residual components such as polyamide, butyl naphthenate, dimethyl fumarate and the like, putting into a kneader, kneading at the temperature of 90 ℃ for 60 minutes, naturally cooling, feeding into a granulator, and carrying out melt extrusion granulation to obtain the required additive master batch.

The working steps of the clamping mechanism are as follows: the second cylinder is driven to drive the motor to move, and then one clamping mechanism is driven to move, then the core pipe is inserted into the annular groove, the fifth cylinder is driven to work, the first arc-shaped block is driven to move, under the reaction force of the third spring, the first arc-shaped block is matched with the second arc-shaped block to fix one end of the core pipe, the motor resets, and then two ends of the core pipe are fixed through the two clamping mechanisms.

The working steps of the pressing mechanism are as follows: the third cylinder is driven, the piston rod drives the connecting block to ascend and descend, the movable plate is driven to ascend and descend, the movable plate is guided through the first guide rod, and the height of the upper compression roller is adjusted.

The working steps of the grinding mechanism are as follows: the fourth cylinder is driven to drive the rocker arm to move through the piston rod, so that the movable block moves horizontally, the sliding plate is pushed to slide through the second spring, the second polishing roller is pushed to move, and the distance between the second polishing roller and the first polishing roller is adjusted.

The working steps of the leveling roller are as follows: the first cylinder is driven to work, the cross beam is driven to ascend and descend, the leveling roller is abutted to the thin sheet when the first spring is in a natural state, and the thin sheet is compressed to be in a leveling state through a gap between the leveling roller and the core pipe and is wound on the core pipe in the winding process.