CN111546605A - Isothermal crystallization extrusion molding method for thermoplastic polypropylene cable - Google Patents
Isothermal crystallization extrusion molding method for thermoplastic polypropylene cable Download PDFInfo
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- CN111546605A CN111546605A CN202010340935.XA CN202010340935A CN111546605A CN 111546605 A CN111546605 A CN 111546605A CN 202010340935 A CN202010340935 A CN 202010340935A CN 111546605 A CN111546605 A CN 111546605A
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- Prior art keywords
- polypropylene
- isothermal crystallization
- crystallization
- temperature
- molding method
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/007—Methods for continuous mixing
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92561—Time, e.g. start, termination, duration or interruption
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92942—Moulded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
Abstract
The invention discloses an isothermal crystallization extrusion molding method of a thermoplastic polypropylene cable, belonging to the field of high voltage and insulation, and comprising the following steps of drying a thermoplastic polypropylene material; preheating a screw of the catenary extrusion unit; step three, adjusting the compression ratio of the screw rod, and starting mixing; step four, installing water-cooling equipment on the extruder unit, and establishing a complete temperature control system; step five, cooling to a constant temperature by using a water cooling control mode and keeping for 10 min; and sixthly, performing water-cooled sectional cooling to obtain the polypropylene cable insulation after isothermal crystallization at 126 ℃ for 10 min. The polypropylene cable sample shows higher electrical performance after being subjected to isothermal crystallization at 126 ℃ for 10min, and has important application value in the aspect of wire and cable insulation.
Description
Technical Field
The invention relates to the field of thermoplastic electrical insulating materials, in particular to an isothermal crystallization extrusion molding method of a thermoplastic polypropylene cable.
Background
Crosslinked polyethylene has excellent insulating properties and mechanical properties and is widely used as an insulating material for high voltage cables. However, the crosslinked polyethylene insulating material has the disadvantages of difficult recycling, limited working temperature, complex crosslinking and extrusion process, and the like, and it is particularly critical to develop an environment-friendly cable material with excellent electrical insulating property. The polypropylene has higher melting point and excellent electrical property, meets the requirement of environment-friendly recyclable cable insulation materials, and is considered to have the potential of replacing crosslinked polyethylene insulation materials.
In the polypropylene extrusion molding process, the polypropylene is first heated to a certain temperature to plasticize the polypropylene and achieve a flowing condition. Secondly, the polypropylene forming conditions have great influence on the crystalline form, and the type and the crystalline form of the microcrystal have direct influence on the electrical performance. The main factors influencing the polypropylene crystallization appearance are crystallization temperature and cooling rate, and the crystallization appearance can be changed by controlling the temperature change of polypropylene cable extrusion molding, so that the electrical performance of polypropylene insulation is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a process and a method for extruding and molding a polypropylene electrical insulating material through an isothermal crystallization process.
The invention specifically comprises the following steps:
step one, drying a thermoplastic polypropylene material for 7 hours;
heating the screw of the catenary extrusion unit to 200 ℃ by using an electromagnetic induction heating device, wherein the heating rate is 10 ℃/min, and the preheating is 10 min;
step three, placing the polypropylene material on a screw, and adjusting the compression ratio of the screw to be 1: 1.2, mixing for 15 min;
step four, installing water-cooling equipment on the extrusion unit, adopting a thermocouple and an infrared temperature measuring device to measure the temperature of the screw and the temperature of the polypropylene material in real time, establishing a temperature monitoring man-machine interface based on the configuration king, and finishing accurate control of the temperature of the polypropylene material;
step five, opening a water cooling control system, simultaneously reducing the output power of the electromagnetic induction heating device to 50% of the original output power, reducing the temperature of the polypropylene material to 126 ℃, reducing the temperature reduction rate to 20 ℃/min, closing the water cooling device and keeping the temperature for 10 min;
and sixthly, performing water-cooled sectional cooling to obtain the polypropylene cable insulation after isothermal crystallization at 126 ℃ for 10 min.
In the second step of the invention, the compression ratio of the screw is 1: (1.1-1.5), preferably 1: 1.2.
in the fifth step of the invention, the crystallization temperature of the polypropylene material is reduced to 130 ℃, preferably 126 ℃.
In the fifth step of the invention, the crystallization and cooling rate of the polypropylene material is 15-25 ℃/min, preferably 20 ℃/min.
In the sixth step of the invention, the crystallization time of the polypropylene material is 7-12min, preferably 10 min.
The invention has the advantages and beneficial effects that: the behavior that the polypropylene cable sample is directly cooled without being subjected to the isothermal crystallization process can lead the polypropylene crystallization to be incomplete, a large amount of crushed crystals with small size exist in the matrix, and further the improvement of the breakdown performance of the polypropylene cable is not facilitated, and the polypropylene cable sample can form more complete spherulites after being subjected to the isothermal crystallization at 126 ℃ for 10min, so that the breakdown performance of the cable is improved.
Drawings
FIG. 1 is a polarization microscope photograph of a polypropylene cable sample without isothermal crystallization.
FIG. 2 is a polarization microscope photograph of a polypropylene cable sample after isothermal crystallization at 126 ℃ for 10 min.
FIG. 3 is a Weibull plot of the DC breakdown field strength of polypropylene cable samples.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
Example 1
An isothermal crystallization method of a thermoplastic polypropylene cable sample comprises the following steps:
firstly, placing a polypropylene matrix in a drying oven at 50 ℃ for drying for 7 hours;
step two, heating the roller of the double-roller mixing mill to 200 ℃ by using an electromagnetic heating device, placing a certain amount of polypropylene on the roller, adjusting the rotating speed of a servo motor driving the roller to be 30r/min, mixing for 5min, and taking out to achieve the purpose of cleaning the double rollers;
weighing 50g of dried polypropylene, placing the dried polypropylene in a double-roller mixing mill for mixing for 15min, and fully and uniformly dispersing to obtain an unvulcanized polypropylene rubber material;
and step four, opening an electromagnetic heating device of the hot-press forming machine, setting the temperature to be 200 ℃, preheating for 10min, weighing a proper amount of the sizing material in the step three, and covering the sizing material with an upper PET film and a lower PET film. Placing the rubber material into a mold of a hot-press forming machine, and keeping at 200 deg.C and 10MPa for 10 min;
step five, measuring the temperature of the die in real time by using a thermocouple temperature measuring device, opening a water cooling circulating device, reducing the temperature of the die to 126 ℃, closing the water cooling device, and keeping the isothermal crystallization process for 10 min;
and step six, releasing the pressure applied to the mold, and taking out the mold to cool to obtain a sample.
Further: in the fifth step, the moderate temperature crystallization temperature is controlled between 122 ℃ and 130 ℃.
Further: in the fifth step, the isothermal crystallization time is controlled to be 7-12 min.
As shown in the polarization microscope image of the polypropylene cable sample without isothermal crystallization in FIG. 1, the polypropylene crystallites have not yet formed a complete structure and have a large amount of crushed crystallites.
As shown in a polarization microscope picture of a polypropylene cable sample after isothermal crystallization at 126 ℃ for 10min in FIG. 2, a large number of polypropylene microcrystals form a complete spherulite shape.
As shown in FIG. 3, the electric field strength of the polypropylene cable sample after 10min of isothermal crystallization at 126 ℃ at 63.2% breakdown probability is 342.2kV/mm, which is 19.7% higher than that of polypropylene without isothermal crystallization process at 285.9kV/mm breakdown field strength.
The present embodiment is only illustrative of the patent and does not limit the scope of protection.
Claims (8)
1. An isothermal crystallization extrusion molding method of a thermoplastic polypropylene cable is characterized by comprising the following steps:
drying a thermoplastic polypropylene material;
heating the screw of the catenary extrusion unit by using an electromagnetic induction heating device;
thirdly, placing the polypropylene material on a screw, adjusting the compression ratio of the screw, and mixing for 15 min;
step four, installing water-cooling equipment on the extrusion unit, adopting a thermocouple and an infrared temperature measuring device to measure the temperature of the screw and the temperature of the polypropylene material in real time, establishing a temperature monitoring man-machine interface based on the configuration king, and finishing accurate control of the temperature of the polypropylene material;
step five, opening a water cooling control system, simultaneously reducing the output power of the electromagnetic induction heating device to 50% of the original output power, cooling the temperature of the polypropylene material at the rate of 20 ℃/min, closing the water cooling device, and keeping the temperature for 10min for crystallization;
and step six, adopting water-cooled sectional cooling to obtain the polypropylene cable insulation after isothermal crystallization.
2. The isothermal crystallization extrusion molding method for thermoplastic polypropylene cable according to claim 1, wherein the screw heating temperature in the second step is 190-.
3. The isothermal crystallization extrusion molding method of thermoplastic polypropylene cable according to claim 1, wherein the screw compression ratio in step three is 1: (1.1-1.5), preferably 1: 1.2.
4. the isothermal crystallization extrusion molding method for thermoplastic polypropylene cable according to claim 1, wherein the crystallization temperature of the polypropylene material in the step five is decreased to 122-130 ℃, preferably 126 ℃.
5. The isothermal crystallization extrusion molding method of thermoplastic polypropylene cable according to claim 1, wherein the crystallization cooling rate of the polypropylene material in the fifth step is 15-25 ℃/min, preferably 20 ℃/min.
6. Isothermal crystallization extrusion process for thermoplastic polypropylene cables according to claim 1, wherein in step five the polypropylene material crystallization time is 7-12min, preferably 10 min.
7. The isothermal crystallization extrusion molding method of thermoplastic polypropylene cable according to claim 1, wherein the electromagnetic heating device is used to heat the roller of the two-roller mixer to 175 ℃, the polypropylene is placed on the roller, the rotation speed of the servo motor driving the roller is adjusted to 30r/min, and the polypropylene is taken out after 5min of mixing.
8. The isothermal crystallization extrusion molding method for thermoplastic polypropylene cables as claimed in claim 1, wherein the unvulcanized polypropylene compound is obtained after the mixing in the third step and the sufficient and uniform dispersion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010340935.XA CN111546605A (en) | 2020-04-26 | 2020-04-26 | Isothermal crystallization extrusion molding method for thermoplastic polypropylene cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010340935.XA CN111546605A (en) | 2020-04-26 | 2020-04-26 | Isothermal crystallization extrusion molding method for thermoplastic polypropylene cable |
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| Publication Number | Publication Date |
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| CN111546605A true CN111546605A (en) | 2020-08-18 |
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| CN202010340935.XA Pending CN111546605A (en) | 2020-04-26 | 2020-04-26 | Isothermal crystallization extrusion molding method for thermoplastic polypropylene cable |
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Citations (15)
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| JPH05169516A (en) * | 1991-12-25 | 1993-07-09 | Mitsui Toatsu Chem Inc | Extrusion-molding method of semicrystalline polyimide |
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2020
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| JPH05169516A (en) * | 1991-12-25 | 1993-07-09 | Mitsui Toatsu Chem Inc | Extrusion-molding method of semicrystalline polyimide |
| JP2004137415A (en) * | 2002-10-21 | 2004-05-13 | Mitsubishi Engineering Plastics Corp | Extrusion molded product made of polyacetal resin |
| CN1508925A (en) * | 2002-12-16 | 2004-06-30 | 宁波信高塑化有限公司 | Bushing tube for buried medium-high voltage power cable and production method thereof |
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Application publication date: 20200818 |
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