CN112388933A - High-toughness polypropylene and preparation method thereof - Google Patents
High-toughness polypropylene and preparation method thereof Download PDFInfo
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- CN112388933A CN112388933A CN202011174632.1A CN202011174632A CN112388933A CN 112388933 A CN112388933 A CN 112388933A CN 202011174632 A CN202011174632 A CN 202011174632A CN 112388933 A CN112388933 A CN 112388933A
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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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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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
- B29C48/03—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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/20—Edge clamps
Abstract
The invention belongs to the technical field of polymer processing, and particularly relates to high-toughness polypropylene and a preparation method thereof. The polypropylene is only composed of pure isotactic polypropylene, the axial tensile strength of the polypropylene is 50-60MPa, and the elongation at break of the polypropylene is 700-800%. The method applies the concept of grain refinement in the metal material to the processing of the isotactic polypropylene material for the first time, and considers the influence of grain orientation. The preparation method comprises the steps of firstly stretching a polypropylene melt at a high speed at a certain temperature to promote molecular chain orientation, then immediately cooling at a high speed to solidify the melt, and preparing the polypropylene product with a high-density and strong-orientation microcrystalline structure. Meanwhile, the polypropylene obtained by the invention has high elongation at break and shows ultrahigh toughness under the condition of ensuring high tensile strength.
Description
Technical Field
The invention belongs to the technical field of polymer processing, and particularly relates to high-toughness polypropylene and a preparation method thereof.
Background
The polypropylene material has a plurality of excellent physical properties such as light weight, good transparency, bending resistance, stable chemical property and the like, and is widely applied to a plurality of fields such as packaging, automobiles, national defense and the like. At present, the industrial polypropylene mainly takes isotactic polypropylene as a main component, and has high molecular regularity and stronger crystallization capacity. However, the isotactic polypropylene has a glass transition temperature of about-20 ℃ to-30 ℃ which is slightly lower than normal temperature, i.e., the molecular chain has weak mobility, which easily causes poor toughness and low impact strength of products such as injection molding parts, pipes, films, etc., thus greatly limiting the application range.
As a semi-crystalline polymer, the macroscopic mechanical property of isotactic polypropylene depends on the microscopic crystal structure, and the reasonable regulation and control of crystallization behavior is one of effective ways for realizing the improvement of the toughness of polypropylene. Under normal conditions, alpha-spherulites are generated by cooling a polypropylene melt, the inter-grain connection is small, stress concentration is easy to generate on the material, and brittle fracture occurs. The elongation at break of the material can be improved to a certain extent by inhibiting alpha crystals and inducing the generation of beta crystals, gamma crystals or mesophases, thereby improving the toughness of the material. Application with publication number CN103073793A discloses a high-strength high-toughness polypropylene pipe and a preparation method thereof, wherein the high-strength high-toughness polypropylene pipe is prepared by adding a beta nucleating agent into polypropylene. Application with publication number CN110343332A discloses a high-toughness polypropylene/elastomer composite material and a preparation method thereof, which takes polypropylene, a beta nucleating agent, an elastomer and carbon nanotubes as raw materials. The method realizes the toughening of the polypropylene by compounding with other functional additives and regulating and controlling based on crystal forms. However, on one hand, the addition of the functional assistant can affect the intrinsic optical and density physical properties of the polypropylene material, and on the other hand, the modification of the crystal form improves the elongation at break and is accompanied by the reduction of modulus and tensile strength. Therefore, it is an important research topic in the art to provide a high-tenacity polypropylene having both high tensile strength and high elongation at break without adding a third-party auxiliary.
Disclosure of Invention
The invention aims to provide a novel high-toughness polypropylene and a preparation method thereof, wherein the polypropylene obtains good tensile strength and elongation at break on the premise of not adding a third-party toughening auxiliary agent.
The technical scheme of the invention is as follows:
high-toughness polypropylene, wherein the polypropylene only consists of pure isotactic polypropylene, the axial tensile strength of the polypropylene is 50-60MPa, and the elongation at break of the polypropylene is 700-800%.
The invention also provides a preparation method of the high-toughness polypropylene, which comprises the steps of preparing the isotactic polypropylene into a prefabricated film with the thickness of 0.5-2 mm; then heating the prefabricated film to be completely melted and eliminating the heat history; then cooling to the stretching temperature to stretch the melt, so as to orient the molecular chain; and immediately cooling at high speed after the drawing is finished to solidify the melt, thereby obtaining the high-toughness polypropylene.
Preferably, the isotactic polypropylene has a flow index of 0.2-0.4g/10min (230 ℃/2.16kg, ASTM D1238). The parameter ensures that the polypropylene material has higher melt strength at the high temperature of 190 ℃ and 220 ℃.
Preferably, the melting temperature of the prefabricated film is 190-220 ℃, and the heat history is eliminated by keeping the prefabricated film at the melting temperature for 5-20 min.
Preferably, the melt stretching temperature is 140-160 ℃, and the stretching strain rate is 10-50s-1The stretch ratio is 15-25.
Preferably, after the stretching is finished, the high-speed cooling is carried out at a cooling rate of 100-150 ℃/s. The cooling can be carried out by adopting a liquid nitrogen spraying mode.
Specifically, the preparation method of the high-toughness polypropylene comprises the following steps:
(1) preparing the isotactic polypropylene into a prefabricated film with the thickness of 0.5-2mm by an extrusion or mould pressing mode, and then fixing the prefabricated film on melt stretching equipment;
(2) the polypropylene prefabricated film is heated to 190-220 ℃ (preferably 200 ℃) from room temperature, and is kept for 5-20min (preferably 10min) to be completely melted and eliminate heat history. Inert nitrogen can be used as a heating medium;
(3) stopping heating, and immediately performing melt stretching operation when the temperature of the polypropylene melt is reduced to 160 ℃ (preferably 150 ℃) of the stretching temperature 140--1A stretch ratio of 15 to 25 (preferably 20), and a dielectric constantConducting molecular chain orientation deformation;
(4) and immediately carrying out high-speed cooling by liquid nitrogen after the stretching is finished, wherein the cooling rate is 100-150 ℃/s, and the melt is solidified to obtain the high-toughness polypropylene.
The invention realizes the great improvement of the toughness of the polypropylene by combining the melt stretching flow field and the high-speed cooling temperature field, simultaneously does not add a third toughening auxiliary agent, and keeps the physical and chemical properties of the material to the maximum extent, thereby providing a novel preparation method of the high-toughness polypropylene.
The invention uses the concept of grain refinement in metal materials to realize body toughening to a certain extent. For metal materials, grain refinement is a well-established and effective bulk toughening means. Compared with coarse grains, the fine grains can obviously reduce stress concentration, and the grain boundary area is large, so that crack propagation can be effectively prevented, and the metal material is endowed with higher strength, plasticity and toughness. However, studies and practices for toughening a polymer material by grain refinement have been rarely reported. The research of the inventor finds that, different from metal materials, the polymer has a special long-chain structure, and besides the grain size possibly influencing the macroscopic mechanical behavior, the molecular chain or the grain orientation is also a key factor.
The invention fully considers the influence of grain refinement and grain orientation on the macroscopic mechanical behavior of the polypropylene material, combines two modes of melt stretching and high-speed cooling, the former enables molecular chains to be oriented, and the latter enables the grains to be refined, and prepares the polypropylene product with a high-density and strong-orientation microcrystalline structure. The polypropylene obtained by the invention has large elongation at break and shows ultrahigh tensile toughness under the condition of ensuring high tensile strength.
Furthermore, the present invention is preferably, but not limited to, realized by the following means:
the utility model provides a realize tensile device of fuse-element of high-speed cooling, the device is including tensile system and temperature control system, tensile system includes at least two anchor clamps that are used for centre gripping fuse-element material, and anchor clamps are driven by the power supply respectively and make the fuse-element position of centre gripping make subtend or dorsad deformation relative other positions, temperature control system includes cooling body, and cooling body includes coolant container and is used for connecting the cooling tube of coolant container, the export of cooling tube sets up towards anchor clamps department.
The device is still including the operation cavity that is used for placing the fuse-element, the export of anchor clamps and pipeline all sets up in the operation cavity, constitutes at least one in the shrouding of operation cavity can dismantle with other shroudings and be connected.
The stretching system comprises two roller clamps arranged in parallel, rollers of the two roller clamps are connected with a torque sensor through a coupler, and the torque sensor is connected with an output shaft of a servo motor through the coupler.
The temperature control system further comprises a heating mechanism, the heating mechanism comprises an electric heating rod arranged in the operation cavity, a thermocouple used for monitoring the temperature inside the operation cavity, a protective gas container located outside and a protective gas pipeline communicated with the protective gas container and the operation cavity, and a corresponding control valve is arranged on the protective gas pipeline.
An electric pump, a flow valve and a low-temperature electromagnetic valve are sequentially arranged on the cooling pipeline from the coolant container to the outlet direction.
The low-temperature electromagnetic valve is a two-position three-way valve, and an inlet and a first outlet of the low-temperature electromagnetic valve are respectively communicated with the cooling pipeline and a second outlet of the low-temperature electromagnetic valve is communicated with the outside.
The cooling pipeline is a Polytetrafluoroethylene (PTFE) pipe, and an outlet of the cooling pipeline is L-shaped and is aligned to the melt among the clamps and arranged at the same height.
The servo motor, the electric pump and the electric heating rod of the device are all controlled by an external PC control end, corresponding data monitored by the torque sensor and the thermocouple can be displayed by the PC control end, and a traditional control mode can be adopted. From the perspective of optimization operation, matched developed software can be used to further realize that flow field parameters (including temperature, strain rate and the like) and temperature field parameters (melt cooling rate) can be adjusted in a large range, and the sequence and interval time accuracy of the application of the flow field and the temperature field can be further realized. The heat preservation gas adopts low-pressure nitrogen and the coolant adopts liquid nitrogen. The corresponding clamp can adopt a roller clamp, and can also adopt other forms of clamps, and meanwhile, the power source matched with the clamp can adopt corresponding matching modes such as an electric cylinder and the like.
Compared with the prior art, the invention has the following advantages:
the invention applies the concept of realizing bulk toughening by grain refinement in the metal material to the processing of the isotactic polypropylene for the first time, but the concept is not directly utilized, and besides the influence of the grain refinement on macroscopic mechanical behavior, the influence of molecular chains or grain orientation is also considered. The high-toughness polypropylene prepared by the invention has a high-density and strong-orientation microcrystalline structure, and greatly improves the elongation at break of the material under the condition of not reducing the tensile strength. In addition, the preparation method disclosed by the invention has the advantages that the raw materials are simple, the trouble that a third-party toughening auxiliary agent is added and the accurate proportion is required is avoided, the combination with industrial production is easy, and the popularization and the application are convenient.
Drawings
FIG. 1 is an SEM topography of polypropylene prepared by melt drawing and high-speed cooling of example 1;
FIG. 2 is an SEM topography of polypropylene prepared by melt drawing and natural cooling of comparative example 1;
FIG. 3 is a tensile mechanical curve of the polypropylene of example 1 and comparative examples 1 to 5;
FIG. 4 is a schematic structural diagram of a melt drawing device for achieving high-speed cooling in an embodiment;
fig. 5 is a schematic perspective view of the connection structure between the stretching system and the operation chamber in the device shown in fig. 4.
Detailed Description
The technical solution of the present invention is illustrated by the following specific examples, but the scope of the present invention is not limited thereto:
the isotactic polypropylene raw materials used in the following examples were obtained from SABIC-Europe and had a melt flow index of 0.3g/10min (230 ℃/2.16kg, ASTM D1238).
Example 1
The preparation of high-toughness polypropylene includes the following steps:
(1) preparing a prefabricated film with the thickness of 1mm from the isotactic polypropylene granules by a mould pressing mode, cutting the prefabricated film into pieces with the size of 45mm multiplied by 20mm, and then installing and fixing the prefabricated film on melt stretching equipment;
(2) heating the prefabricated film from room temperature to 200 ℃ at the heating rate of 20 ℃/min to completely melt the prefabricated film and preserving heat for 10min to eliminate the heat history;
(3) stopping heating, cooling at a cooling rate of 10 ℃/min, immediately stretching the melt when the temperature of the isotactic polypropylene melt is reduced to 150 ℃, wherein the stretching rate is 20s-1The molecular chain is oriented and deformed at a stretching ratio of 20;
(4) and immediately cooling the polypropylene by liquid nitrogen at a high speed after the drawing is stopped, wherein the cooling rate is about 130 ℃/s, and the melt is solidified to obtain the high-toughness polypropylene.
Carrying out SAXS test on the obtained polypropylene to obtain crystal size information, wherein the test result is as follows: the distance between platelets is 15.5nm, the thickness of the platelets is 6.8nm, the lateral dimension is 60.2nm, and the volume of crystal grains is 1.9 multiplied by 104nm3Crystal grain density of 2.1X 1022/m3The degree of crystal grain orientation was 97.7%.
The obtained polypropylene is etched by strong acid, the crystal morphology is observed by using SEM, the details are shown in the attached figure 1, and the test result is as follows: the grain size is small and exhibits a high density, highly oriented distribution.
The obtained polypropylene is subjected to mechanical test, and the test result is as follows: the axial tensile strength is 56.9MPa, and the breaking elongation is 793%.
Comparative example 1
The polypropylene (natural cooling treatment) is prepared by the following operation steps:
(1) preparing a prefabricated film with the thickness of 1mm from the isotactic polypropylene granules by a mould pressing mode, cutting the prefabricated film into pieces with the size of 45mm multiplied by 20mm, and then installing and fixing the prefabricated film on melt stretching equipment;
(2) heating the prefabricated film from room temperature to 200 ℃ at the heating rate of 20 ℃/min to completely melt the prefabricated film and preserving heat for 10min to eliminate the heat history;
(3) stopping heating, cooling at a cooling rate of 10 ℃/min, and immediately drawing the melt when the temperature of the isotactic polypropylene melt is reduced to 150 DEG CStretching rate 20s-1The molecular chain is oriented and deformed at a stretching ratio of 20;
(4) and after the stretching is stopped, naturally cooling the polypropylene melt in the air, and slowly solidifying to obtain the polypropylene which is not subjected to high-speed cooling treatment.
Carrying out SAXS test on the obtained polypropylene to obtain crystal size information, wherein the test result is as follows: the distance between platelets is 36.7nm, the thickness of the platelets is 22.9nm, the lateral dimension is 108.4nm, and the volume of crystal grains is 2.1 multiplied by 105nm3Crystal grain density of 2.6X 1021/m3The degree of crystal orientation was 98.5%.
The obtained polypropylene is etched by strong acid, the crystal morphology is observed by using SEM, the details are shown in the attached figure 2, and the test result is as follows: the crystal grains have large sizes and exhibit a low-density, high-orientation distribution.
The obtained polypropylene is subjected to mechanical test, and the test result is as follows: the axial tensile strength is 49.6MPa, and the breaking elongation is 149 percent.
Comparative examples 2 to 5
After the drawing in the step (4) is stopped, the temperature is respectively kept at the drawing temperature of 150 ℃ for 0.5min (comparative example 2), 1min (comparative example 3), 3min (comparative example 4) and 10min (comparative example 5), and then the liquid nitrogen high-speed cooling is carried out, otherwise the same as the example 1.
Compared with example 1 and comparative example 1, the difference is that the isotactic polypropylene sample prepared contains grains with large and small sizes.
The obtained polypropylene is subjected to mechanical test, and the test result is as follows: comparative examples 2 to 5 had tensile strengths in the machine direction of 53.2MPa, 47.2MPa, 45.9MPa, 49.7MPa, respectively, and elongations at break of 689%, 346%, 223%, 169%, respectively.
From the comparison, in the preparation method, the high toughness of the polypropylene can be realized by combining two processing technologies of melt stretching and high-speed cooling without a third toughening auxiliary agent. Compared with the comparative example 1 adopting natural cooling and the comparative examples 2-5 adopting high-speed cooling after heat preservation for a period of time, the high-speed cooling immediately after the melt is stretched in the example 1 can greatly promote grain refinement, generate a microcrystalline structure with high density and strong orientation, and further improve the tensile strength and the elongation at break of the material.
The above embodiment can be carried out using the following apparatus shown in FIGS. 4-5:
the utility model provides a realize tensile device of fuse-element of high-speed cooling, the device includes mount table 1 to and set up tensile system, temperature control system on mount table 1 and the operation cavity 3 of compriseing several shroudings, the top shrouding of operation cavity 3 can be dismantled with other shroudings and even:
the stretching system comprises two roller clamps 24 which are arranged in the operation cavity 3 in parallel, rollers of the two roller clamps 24 are connected with a torque sensor 23 through a coupler 22 outside the operation cavity 3, and the torque sensor 23 is connected with an output shaft of the servo motor 21 through the coupler 22;
temperature control system includes cooling body and heating mechanism, and cooling body includes coolant container and is used for connecting coolant container 31's cooling tube 33, and cooling tube 33's export is connected with the L type spray tube 35 that sets up on 3 top shroudings of operation cavity, and the macromolecular material sample department setting between roller anchor clamps 24 is aimed at in the export of L type spray tube 35, by coolant container to export direction last electric pump 36, flow valve 32 and the low temperature solenoid valve 34 of being equipped with in order of cooling tube 33, low temperature solenoid valve 34 is two-position three-way valve, and low temperature solenoid valve 34's import and first export communicate with cooling tube 33 respectively, the second export communicates with the external world.
The heating mechanism (not shown in the figure) comprises an electric heating rod arranged in the operation cavity 3, a thermocouple for monitoring the temperature inside the operation cavity, a protective gas container positioned outside and a protective gas pipeline communicated with the protective gas container and the operation cavity, and the protective gas pipeline is provided with a corresponding control valve.
Specifically, the cooling pipeline 33 is a polytetrafluoroethylene pipe, the L-shaped nozzle 35 is made of stainless steel, the servo motor, the electric pump and the electric heating rod are all controlled by an external PC control end, corresponding data monitored by the torque sensor and the thermocouple are also displayed by the PC control end, and a traditional control mode can be adopted, and a flange physical regulation mode and the like can be adopted for controlling the flow valve.
The process of the embodiment using the above apparatus is as follows:
firstly, opening an operation cavity, fixing two ends of the length of an isotactic polypropylene prefabricated film by using a roller clamp, then closing the operation cavity, filling low-pressure nitrogen into the operation cavity through a protective gas pipeline to enable a high polymer material sample to be in a protective gas environment, then controlling an electric heating rod to be heated to a constant certain temperature (200 ℃ in embodiment 1), and keeping the temperature for a certain time (10 min in embodiment 1) to eliminate thermal history;
stopping heating, introducing nitrogen for cooling, immediately stretching the melt at a constant strain rate to a specified strain (the system has preset stretching parameters including strain and strain rate) when the temperature of the isotactic polypropylene melt is reduced to 150 ℃, simultaneously collecting a voltage-time signal in the stretching process by a torque sensor, and converting the voltage-time signal into a stress-strain curve by using preloaded software on a PC (personal computer) terminal so as to obtain information such as molecular chain deformation, melt modulus and the like.
In the process, the electric liquid nitrogen pump is started, the low-temperature electromagnetic valve is powered off at the moment, the liquid nitrogen is continuously discharged to the open space through the second outlet of the low-temperature electromagnetic valve, and the process aims to cool the area of the cooling pipeline between the electric pump and the low-temperature electromagnetic valve in advance so as to reduce the problem that the liquid nitrogen is gasified due to heat exchange in the section of pipeline during later formal cooling, and the cooling effect on the melt is poor.
And after the stretching is finished, the low-temperature electromagnetic valve is electrified, the second outlet is closed, the first outlet is opened, and at the moment, liquid nitrogen directly sprays to the deformed high-temperature polypropylene sample through the first outlet to cool the sample at a high speed. The average cooling rate is controlled by the flow of the liquid nitrogen, and the time interval between the melt stretching and the liquid nitrogen cooling is freely adjustable.
And after the operation cavity and the polypropylene in the operation cavity are fully cooled, closing the electric pump, taking out the solid sample subjected to melt stretching and high-speed cooling dual treatment, and then carrying out related microstructure and form characterization detection.
Claims (6)
1. High-toughness polypropylene, characterized in that the polypropylene consists of pure isotactic polypropylene only, and has tensile strength in the axial direction of 50-60MPa and elongation at break of 700-.
2. The method for preparing high-toughness polypropylene as claimed in claim 1, wherein the isotactic polypropylene is first formed into a prefabricated film of 0.5-2 mm; then heating the prefabricated film to be completely melted and eliminating the heat history; then cooling to the stretching temperature to stretch the melt, so as to orient the molecular chain; and immediately cooling at high speed after the drawing is finished to solidify the melt, thereby obtaining the high-toughness polypropylene.
3. The method for producing a high-toughness polypropylene as claimed in claim 2, wherein the melting temperature of the pre-formed film is 190 ℃ to 220 ℃, and the heat history is removed by keeping the pre-formed film at the melting temperature for 5 to 20 minutes.
4. The process for producing a high-toughness polypropylene as claimed in claim 2, wherein the melt-stretching temperature is 140 ℃ and the stretching strain rate is 10 to 50s-1The stretch ratio is 15-25.
5. The process for producing a high-toughness polypropylene as claimed in claim 2, wherein the high-speed cooling is carried out at a temperature decreasing rate of 100-150 ℃/s after the end of the drawing.
6. Process for the preparation of high tenacity polypropylene according to any one of claims 2 to 5, wherein the starting isotactic polypropylene has a flow index in the range of 0.2 to 0.4g/10min (230)oC/2.16kg, ASTM D1238）。
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| CN113370443A (en) * | 2021-06-16 | 2021-09-10 | 中国科学技术大学 | Preparation method of high-impact-strength polypropylene material |
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