CN115847883A - Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing - Google Patents
Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing Download PDFInfo
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- CN115847883A CN115847883A CN202211417407.5A CN202211417407A CN115847883A CN 115847883 A CN115847883 A CN 115847883A CN 202211417407 A CN202211417407 A CN 202211417407A CN 115847883 A CN115847883 A CN 115847883A
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- 229920001155 polypropylene Polymers 0.000 title claims abstract description 107
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000004033 plastic Substances 0.000 title claims abstract description 27
- 229920003023 plastic Polymers 0.000 title claims abstract description 27
- 238000000137 annealing Methods 0.000 title claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000005303 weighing Methods 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 230000005284 excitation Effects 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000007669 thermal treatment Methods 0.000 claims 1
- 239000004743 Polypropylene Substances 0.000 description 80
- 238000000465 moulding Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920005630 polypropylene random copolymer Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a method and a device for preparing a high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing, wherein the method comprises the steps of 1) weighing raw materials according to a formula, uniformly mixing, and then feeding into a single-screw extruder for extrusion molding to obtain an original PP-R pipe; 2) Placing an original PP-R pipe in a vibration-temperature composite field closed box, wherein a vibration field source is arranged in the box body, the temperature in the box body is controllable and adjustable, and the residence time of the original PP-R pipe in the vibration-temperature composite field closed box is 5-30min; 3) And cooling the PP-R pipe subjected to the vibration-temperature composite field treatment to obtain the low-temperature brittleness resistant PP-R pipe. The invention also discloses a vibration temperature composite field device structure. The PP-R pipe is processed by adopting the vibration and temperature composite field, so that the speed is high, the vibration field and the temperature field are controllable, and the PP-R pipe is clean and sanitary; the residual internal stress of the pipe is fully eliminated, the low-temperature brittleness of the plastic product is effectively solved, other performances of the pipe are not affected, and the cost is saved.
Description
Technical Field
The invention belongs to the field of processing of polymer composite materials, and particularly relates to a method and a device for preparing a high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing.
Background
The random copolymerization polypropylene (PP-R) has good heat resistance, pressure resistance and high-temperature creep property. Compared with other plastics, the plastic has great advantages in the aspects of environmental protection, complexity of processing technology and the like. Therefore, the water heater has been widely used in industrial fields in recent years, and is particularly prominent in the application of indoor and outdoor cold and hot water pipes. However, PP-R pipes suffer from low temperature brittleness, i.e. brittle fracture is prone to occur at low temperatures upon impact. In the process of extruding and shaping the PP-R raw material, molecular chains are violently changed due to the action of high pressure and high shear force, and the molecules are frozen before completely returning to a disordered and relaxed natural state, so that the residual orientation stress is caused, which is the main reason of low-temperature brittleness of the PP-R pipe.
At present, methods such as blending/filling modification and annealing are mostly adopted to improve the low-temperature brittleness problem. The blending/filling modification of the PP-R raw material can improve the impact resistance, but other properties are affected and reduced, so that the long-term service performance is difficult to guarantee. And the residual stress in the matrix in the process of processing and forming the polymer can be solved through proper annealing treatment, so that the comprehensive mechanical property of the material is improved.
The heat treatment method is a common annealing method, and CN 105252793A provides an annealing process for a polypropylene random copolymer (PP-R) pipe, and the purpose of eliminating internal stress is achieved by placing a formed PP-R pipe into a drying vehicle and carrying out multiple heating and cooling treatments. Vibration processing is commonly used for metal workpieces by applying a specific cyclic load to the metal workpiece for a certain time at a given order frequency, thereby achieving a residual stress homogenization process. The process has the characteristics of capability of homogenizing certain residual stress of the workpiece, shorter treatment period, energy conservation, environmental protection, higher treatment efficiency and the like.
However, unlike metal workpieces, PP-R pipes have a high flexibility. The traditional vibration treatment method has small instantaneous action surface with a product, has better stress relief effect on a metal workpiece with higher rigidity and easy vibration transmission, but basically has no effect on a plastic product with high elasticity and difficult vibration transmission. It is therefore desirable to achieve stress relief in plastic articles by increasing the area of vibration applied to the article. In addition, although both the single heat treatment and vibration treatment can be used to remove the residual stress of the product, the effect is still not good when the heat treatment or vibration treatment is used alone. Furthermore, in the case of a single heat treatment, when it is necessary to obtain a suitable effect, a long heat treatment time is required and energy consumption is large.
Disclosure of Invention
Aiming at the problems that the conventional PP-R annealing process in the prior art is complicated, the annealing time is long, the efficiency is low and the cost is high. The invention provides a method and a device for preparing a high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing, the method is simple and convenient to operate, and a vibration field can uniformly act on the PP-R pipeline. Under the action of a vibration field, dynamic stress is generated on the surface and inside of the product, when the superposition of the dynamic stress and the internal residual stress is greater than the yield limit of the material, crystal lattices slide, and the material generates tiny plastic deformation, so that the effect of eliminating and homogenizing the residual stress is achieved, and the problem of low-temperature brittleness of the PP-R pipe can be effectively and quickly solved without influencing other performances of the product by assisting heat treatment.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for preparing a high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing comprises the following steps:
1) Weighing raw materials according to a formula, uniformly mixing, and then sending into a single-screw extruder for extrusion molding to obtain an original PP-R pipe;
2) Placing an original PP-R pipe in a vibration-temperature composite field closed box, wherein a vibration field source is arranged in the box body, the internal temperature of the box body is controllable and adjustable, and the retention time of the original PP-R pipe in the vibration-temperature composite field closed box is 5-30min;
3) And cooling the PP-R pipe subjected to vibration-temperature composite field treatment to obtain the PP-R pipe resistant to low-temperature brittleness.
Further, when the PP-R pipe is extruded by the single-screw extruder in the step 1), the barrel temperature of the extruder is 170-210 ℃, the die head temperature is 170-210 ℃, and the melt temperature is less than or equal to 250 ℃.
Further, the vibration field source in the vibration-temperature composite field closed box can be provided by an ultrasonic generator or a vibration exciter.
Furthermore, the vibration-temperature composite field closed box with the vibration field source provided by the ultrasonic generator takes water as a vibration propagation medium and a heating medium, the PP-R pipe is directly immersed into the water box, the ultrasonic power of the ultrasonic generator is 240W-3000W, the ultrasonic frequency is 25-80kHz, the water temperature is controllable, the temperature control range is 50-95 ℃, and the pipe stays for 5-30min.
Furthermore, the vibration-temperature composite field airtight box with the vibration field source provided by the ultrasonic generator is structurally an ultrasonic airtight water tank with a controllable temperature, an electric heating pipe is arranged on the inner side of the box body, an electronic constant-temperature control instrument and an ultrasonic control instrument are arranged on the outer side of the box body, a flip type opening and closing opening is arranged on the box body, the ultrasonic generator is installed at the bottom of the box body and connected with a plurality of ultrasonic transducers, the other ends of the ultrasonic transducers are connected with an amplitude transformer, the other ends of the amplitude transformer are connected with an ultrasonic welding head, a porous partition plate and a limiting porous plate are further arranged on the inner side of the box body, and the limiting porous plate is movably arranged above the porous partition plate to limit plastic products.
Furthermore, the ultrasonic generator provides a vibration-temperature compound field closed box of a vibration field source, and the outer side of the box body is also provided with a water inlet and a water outlet, so that water can be conveniently fed and discharged; and an air cylinder is arranged on the outer side of the box body and is used for controlling the opening and closing of the flip type opening and closing opening.
Further, a vibration-temperature composite field closed box with a vibration field source provided by a vibration exciter is connected with an excitation table, a PP-R pipe is arranged on the excitation table and fixed by a clamp, a temperature field is provided by a hot air or infrared heating pipe, the excitation force of the vibration exciter is 3-10 kN, the temperature of an oven is 50-110 ℃, and the stay time of the pipe is 5-30min;
further, the vibration-temperature compound field airtight box of vibration field source is provided by the vibration exciter, and the box inner wall is provided with infrared heating pipe, the box still is connected with vibration system and electronic constant temperature control appearance, vibration system includes vibration exciter, sensor, vibration controller and excitation platform, the vibration exciter includes permanent magnet speed regulating motor, eccentric block and eccentric box, and eccentric block and eccentric box are connected on permanent magnet speed regulating motor's vibrating rod and set up the inside at the box, the excitation platform is fixed to be set up on eccentric box upper portion, and the fixed rubber pad that is provided with in eccentric box lower part is provided with anchor clamps on the excitation platform, and the fixed sensor that is provided with in excitation platform below, vibration controller sets up on permanent magnet speed regulating motor, and vibration controller links to each other with vibration exciter and sensor electrical property.
Further, the PP-R pipe subjected to vibration-temperature composite field treatment is naturally cooled at room temperature.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
a) The invention adopts the vibration and temperature composite field to process the PP-R pipe, has uniform processing and high speed, and has controllable vibration field and temperature field, cleanness, sanitation and no pollution;
b) The invention adopts the vibration and temperature composite field to process the PP-R pipe formed by extrusion, saves the processing time, fully eliminates the residual internal stress of the pipe, can effectively solve the low-temperature brittleness of plastic products, does not influence other properties of the pipe, and can save the cost.
Drawings
FIG. 1 is a schematic structural diagram of a vibration-temperature composite field enclosure of the present invention (the vibration field source is an ultrasonic generator);
FIG. 2 is a side view of FIG. 1;
FIG. 3 isbase:Sub>A schematic view of the cross-sectional structure A-A of FIG. 2;
FIG. 4 is a schematic view of the structure of the vibration-temperature complex field enclosure of the present invention (the vibration field source is the vibration exciter);
FIG. 5 is a front view of FIG. 4;
fig. 6 is a schematic view of a cross-sectional structure B-B in fig. 5.
In the figure: 1. ultrasonic sealing the water tank; 2. a water inlet; 3. a water outlet; 4. an electric heating tube; 5. an electronic constant temperature controller; 6. an ultrasonic control instrument; 7. a flip open/close port; 8. an ultrasonic generator; 9. an ultrasonic transducer; 10. an amplitude transformer; 11. an ultrasonic horn; 12. a porous separator; 13. a limiting porous plate; 14. a box body; 15. a cylinder; 16. sealing the oven; 15. an infrared heating pipe; 18. a box body; 19. an electronic constant temperature controller; 20. a vibration exciter; 21. a sensor; 22. a vibration controller; 23. a clamp; 24. an excitation stage; 25. a permanent magnet speed regulation motor; 26. an eccentric block; 27. an eccentric case; 28. a rubber cushion.
Detailed Description
The technical solutions of the present invention are described clearly and completely by the following embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all 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.
The invention relates to a method for preparing a high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing, which comprises the following steps:
1) Weighing raw materials according to a formula, uniformly mixing, and then sending into a single-screw extruder for extrusion molding to obtain an original PP-R pipe;
2) Placing an original PP-R pipe in a vibration-temperature composite field closed box, wherein a vibration field source is arranged in the box body, the internal temperature of the box body can be controlled within an adjustable range, and the retention time of the original PP-R pipe in the vibration-temperature composite field closed box is 5-30min;
3) And cooling the PP-R pipe treated by the vibration-temperature composite field to obtain the PP-R pipe resistant to low-temperature brittleness.
The vibration field source in the preparation method can be provided in two ways, one is that the vibration field source is an ultrasonic generator; the other is that the vibration field source is a vibration exciter.
In the aspect of the device, the pipe extruder is a conventional single-screw extruder and conventional equipment, and the details are not described herein;
for the vibration-temperature composite field device, when the vibration field source is an ultrasonic generator, the structure of the device is as follows: as shown in fig. 1-3, the vibration-temperature composite field closed box structure is an ultrasonic closed water tank 1 with controllable temperature, an electric heating tube 4 is arranged inside a box body 14 of the ultrasonic closed water tank 1, an electronic constant temperature controller 5 and an ultrasonic controller 6 are arranged outside the box body 14, a flip open/close opening 7 is arranged on the box body 14, an ultrasonic generator 8 is installed at the bottom of the box body 14, the ultrasonic generator 8 is connected with a plurality of ultrasonic transducers 9, the other ends of the ultrasonic transducers 9 are connected with an amplitude transformer 10, the other ends of the amplitude transformer 10 are connected with an ultrasonic welding head 11, a porous partition plate 12 and a limiting porous plate 13 are further arranged inside the box body 14, and the limiting porous plate 13 is movably arranged above the porous partition plate 12 to limit plastic products. A water inlet 2 and a water outlet 3 are also arranged on the outer side of the box body 14, so that water can be conveniently fed and discharged; an air cylinder 15 is provided outside the case 14, and the air cylinder 15 is used for controlling the opening and closing of the flip-type opening and closing port 7.
When the vibration field source is a vibration exciter, the device structure is as follows: as shown in fig. 4-6, the vibration-temperature composite field airtight box includes an airtight oven 16, an infrared heating pipe 17 is disposed on an inner wall of a box 18 of the airtight oven 16, the box 18 is further connected with a vibration system and an electronic constant temperature controller 19, the vibration system includes a vibration exciter 20, a sensor 21, a vibration controller 22 and an excitation table 24, the vibration exciter 20 includes a permanent magnet speed regulation motor 25, an eccentric block 26 and an eccentric box 27, the eccentric block 26 and the eccentric box 27 are connected to a vibration rod of the permanent magnet speed regulation motor 25 and are disposed inside the box 18, the excitation table 24 is fixedly disposed on an upper portion of the eccentric box 27, a rubber pad 28 is fixedly disposed on a lower portion of the eccentric box 27, a clamp 23 is disposed on the excitation table 24, the sensor 21 is fixedly disposed below the excitation table 24, the vibration controller 22 is disposed on the permanent magnet speed regulation motor 25, and the vibration controller 22 is electrically connected with the vibration exciter 20 and the sensor 21. Through the cooperation of the excitation table 24 and the clamp 23, the contact area between the vibration system and the product is increased, and the internal stress is better eliminated.
The specific preparation examples are as follows:
example 1 (blank control example)
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 200 ℃, the die head temperature is 200 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm).
Example 2
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 170 ℃, the die head temperature is 170 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm). And (2) feeding the original PP-R pipe into an ultrasonic closed water tank, wherein the ultrasonic frequency is 25kHz, the ultrasonic power is 900W, the temperature of the water tank is 50 ℃, and the retention time of the original PP-R pipe in the ultrasonic closed water tank is 30min. And taking out the PP-R pipe subjected to ultrasonic water bath treatment, and naturally cooling to obtain the PP-R pipe resistant to low-temperature brittleness.
Example 3
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 210 ℃, the die head temperature is 210 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm). And (2) feeding the original PP-R pipe into an ultrasonic closed water tank, wherein the ultrasonic frequency is 80kHz, the ultrasonic power is 1200W, the temperature of the water tank is 95 ℃, and the retention time of the original PP-R pipe in the ultrasonic closed water tank is 5min. And taking out the PP-R pipe subjected to ultrasonic water bath treatment, and naturally cooling to obtain the PP-R pipe resistant to low-temperature brittleness.
Example 4
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 190 ℃, the die head temperature is 190 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm). And (2) feeding the original PP-R pipe into an ultrasonic closed water tank, wherein the ultrasonic frequency is 40kHz, the ultrasonic power is 600W, the temperature of the water tank is 80 ℃, and the retention time of the original PP-R pipe in the ultrasonic closed water tank is 15 minutes. And taking out the PP-R pipe subjected to ultrasonic water bath treatment, and naturally cooling to obtain the PP-R pipe resistant to low-temperature brittleness.
Example 5
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 200 ℃, the die head temperature is 200 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm). And (2) feeding the original PP-R pipe into an ultrasonic closed water tank, wherein the ultrasonic frequency is 40kHz, the ultrasonic power is 900W, the temperature of the water tank is 80 ℃, and the retention time of the original PP-R pipe in the ultrasonic closed water tank is 10 minutes. And taking out the PP-R pipe subjected to ultrasonic water bath treatment, and naturally cooling to obtain the PP-R pipe resistant to low-temperature brittleness.
Example 6
Weighing the raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 170 ℃, the die head temperature is 170 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size is dn20mm and en 2.8mm). The original PP-R pipe is sent into a closed oven provided with a vibration field by a vibration exciter, and is fixed on a vibration exciting table, the vibration exciting force of the vibration exciter is 10kN, the temperature of the oven is 50 ℃, and the residence time of the original PP-R pipe in the closed oven is 30min. And taking out the PP-R pipe processed by the vibration exciter and naturally cooling to obtain the PP-R pipe with low temperature brittleness resistance.
Example 7
Weighing the raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 210 ℃, the die head temperature is 210 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size is dn20mm and en 2.8mm). And (2) feeding the original PP-R pipe into a closed oven provided with a vibration field by a vibration exciter, fixing the sealed oven on a vibration exciting table, wherein the vibration exciting force of the vibration exciter is 3kN, the temperature of the oven is 110 ℃, and the retention time of the original PP-R pipe in the closed oven is 5min. And taking out the PP-R pipe processed by the vibration exciter and naturally cooling to obtain the PP-R pipe with low temperature brittleness resistance.
Example 8
Weighing the raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 190 ℃, the die head temperature is 190 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size is dn20mm and en 2.8mm). And (2) feeding the original PP-R pipe into a closed oven with a vibration field source provided by a vibration exciter, fixing the sealed oven on an excitation table, wherein the excitation force of the vibration exciter is 3kN, the temperature of the oven is 80 ℃, and the retention time of the original PP-R pipe in the closed oven is 10min. And taking out the PP-R pipe processed by the vibration exciter and naturally cooling to obtain the PP-R pipe with low temperature brittleness resistance.
Example 9
Weighing raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 200 ℃, the die head temperature is 200 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size: dn20mm, en 2.8mm). And (2) feeding the original PP-R pipe into a closed oven provided with a vibration field source by a vibration exciter, fixing the sealed oven on an excitation table, wherein the excitation force of the vibration exciter is 5kN, the temperature of the oven is 80 ℃, and the retention time of the original PP-R pipe in the closed oven is 10min. And taking out the PP-R pipe processed by the vibration exciter and naturally cooling to obtain the PP-R pipe with low temperature brittleness resistance.
Example 10 (Heat treatment comparative group)
Weighing the raw materials according to the formula, uniformly mixing, feeding into a single-screw extruder, wherein the barrel temperature of the extruder is 200 ℃, the die head temperature is 200 ℃, and extruding and molding to obtain the original PP-R pipe (the pipe size is dn20mm and en 2.8mm). The original PP-R pipe is sent into a 110 ℃ oven for treatment for 2h. And taking out the PP-R pipe subjected to pure heat treatment, and naturally cooling to obtain the PP-R pipe resistant to low-temperature brittleness.
The drop hammer impact performance and hydrostatic performance of the PP-R pipe are tested:
table 1 hammer head mass: 1.5kg; the treatment conditions are as follows: water bath at 0 deg.C for 15min or more; drop weight height: 1m.
TABLE 2 pipe leakage and rupture times at 20 ℃ under 16MPa (ring stress) hydrostatic pressure.
The test result shows that the drop hammer impact performance and the hydrostatic performance of the PP-R pipe treated by the vibration-temperature mixed field are improved to different degrees, and in addition, compared with the pure heat treatment effect, the treatment time is shorter and is not inferior to the heat treatment effect. Because the pure heat treatment process has longer treatment time and large energy consumption, the process shortens the treatment time and reduces the energy consumption while ensuring the effect.
Claims (10)
1. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing is characterized by comprising the following steps of:
1) Weighing raw materials according to a formula, uniformly mixing, and then sending into a single-screw extruder for extrusion molding to obtain an original PP-R pipe;
2) Placing an original PP-R pipe in a vibration-temperature composite field closed box, wherein a vibration field source is arranged in the box body, the internal temperature of the box body is controllable and adjustable, and the retention time of the original PP-R pipe in the vibration-temperature composite field closed box is 5-30min;
3) And cooling the PP-R pipe subjected to vibration-temperature composite field treatment to obtain the PP-R pipe resistant to low-temperature brittleness.
2. The method for preparing the high-toughness PP-R plastic pipe by using the vibration-temperature composite field annealing as claimed in claim 1, wherein when the PP-R pipe is extruded by the single-screw extruder in the step 1), the barrel temperature of the extruder is 170-210 ℃, the die head temperature is 170-210 ℃, and the melt temperature is less than or equal to 250 ℃.
3. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 1, wherein the vibration field source in the vibration-temperature composite field closed box is provided by an ultrasonic generator.
4. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 3, wherein an ultrasonic generator is used as a closed box of a vibration field source, water is used as a vibration propagation medium and a heating medium, the PP-R pipe is directly immersed in the water tank, the ultrasonic power of the ultrasonic generator is 240W-3000W, the ultrasonic frequency is 25-80kHz, the water temperature is controllable, the temperature control range is 50-95 ℃, and the pipe residence time is 5-30min.
5. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing is characterized in that the vibration-temperature composite field closed box is an ultrasonic closed water tank (1) with the temperature controllable, an electric heating pipe (4) is arranged on the inner side of a box body (14) of the ultrasonic closed water tank (1), an electronic constant temperature controller (5) and an ultrasonic controller (6) are arranged on the outer side of the box body (14), a flip type opening and closing opening (7) is arranged on the upper surface of the box body (14), an ultrasonic generator (8) is arranged at the bottom of the box body (14), the ultrasonic generator (8) is connected with a plurality of ultrasonic transducers (9), the other ends of the ultrasonic transducers (9) are connected with an amplitude transformer (10), the other ends of the amplitude transformer (10) are connected with an ultrasonic welding head (11), a porous partition plate (12) and a limiting porous plate (13) are further arranged on the inner side of the box body (14), and the limiting porous plate (13) is movably arranged above the porous partition plate (12) to limit the plastic product.
6. The device for removing the internal stress of the plastic product through the composite ultrasonic-thermal treatment according to claim 5, wherein a water inlet (2) and a water outlet (3) are further arranged on the outer side of the box body (14) to facilitate water inlet and outlet; an air cylinder (15) is arranged on the outer side of the box body (14), and the air cylinder (15) is used for controlling the opening and closing of the flip type opening and closing opening (7).
7. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 1, wherein a vibration field source in the vibration-temperature composite field closed box is provided by a vibration exciter.
8. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 7, wherein a vibration exciter is used as a closed box of a vibration field source, the vibration exciter is connected with an excitation table, the PP-R pipe is placed on the excitation table and fixed by a clamp, the temperature field is provided by a hot air or infrared heating pipe, the excitation force of the vibration exciter is 3-10 kN, the temperature of an oven is 50-110 ℃, and the stay time of the pipe is 5-30min.
9. The method for preparing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 8, wherein the vibration-temperature composite field closed box comprises a closed oven (16), the inner wall of the box body (18) of the closed oven (16) is provided with an infrared heating pipe (17), the box body (18) is further connected with a vibration system and an electronic constant temperature controller (19), the vibration system comprises a vibration exciter (20), a sensor (21), a vibration controller (22) and an excitation table (24), the vibration exciter (20) comprises a permanent magnet speed regulating motor (25), an eccentric block (26) and an eccentric box (27), the eccentric block (26) and the eccentric box (27) are connected to a vibration rod of the permanent magnet speed regulating motor (25) and arranged in the box body (18), the excitation table (24) is fixedly arranged at the upper part of the eccentric box (27), the lower part of the eccentric box (27) is fixedly provided with a rubber pad (28), the excitation table (24) is provided with a clamp (23), the sensor (21) is fixedly arranged below the excitation table (24), and the vibration controller (22) is connected with the vibration controller (20) and the electric controller (21).
10. The method for manufacturing the high-toughness PP-R plastic pipeline by using the vibration-temperature composite field annealing as claimed in claim 1, wherein the PP-R pipe subjected to the vibration-temperature composite field treatment is naturally cooled at room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211417407.5A CN115847883A (en) | 2022-11-14 | 2022-11-14 | Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing |
| PCT/CN2023/125959 WO2024104059A1 (en) | 2022-11-14 | 2023-10-23 | Method and device for preparing high-toughness pp-r plastic pipeline by means of vibration-temperature composite field annealing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211417407.5A CN115847883A (en) | 2022-11-14 | 2022-11-14 | Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing |
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| WO2024104059A1 (en) * | 2022-11-14 | 2024-05-23 | 临海伟星新型建材有限公司 | Method and device for preparing high-toughness pp-r plastic pipeline by means of vibration-temperature composite field annealing |
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| FR1373768A (en) * | 1963-08-16 | 1964-10-02 | Union Carbide Corp | Method and apparatus for processing thermoplastics |
| EP1590168A4 (en) * | 2003-01-16 | 2008-08-06 | Ian Orde Michael Jacobs | Methods, compositions and blends for forming articles having improved environmental stress crack resistance |
| CN108085632B (en) * | 2017-12-11 | 2019-07-23 | 华中科技大学 | A kind of Plastic Forming and toughening process and its device based on ultrasonic vibration |
| CN212528779U (en) * | 2020-05-29 | 2021-02-12 | 江阴市利盟金属制品有限公司 | Novel high strength hose stress is got rid of device |
| CN113150354A (en) * | 2021-05-10 | 2021-07-23 | 武汉金牛经济发展有限公司 | Microwave treatment method for low-temperature-resistant high-performance PP-R pipe |
| CN115847883A (en) * | 2022-11-14 | 2023-03-28 | 临海伟星新型建材有限公司 | Method and device for preparing high-toughness PP-R plastic pipeline by using vibration-temperature composite field annealing |
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| WO2024104059A1 (en) * | 2022-11-14 | 2024-05-23 | 临海伟星新型建材有限公司 | Method and device for preparing high-toughness pp-r plastic pipeline by means of vibration-temperature composite field annealing |
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