CN110591224A - Polypropylene material and preparation method thereof, structural member and manufacturing method thereof - Google Patents
Polypropylene material and preparation method thereof, structural member and manufacturing method thereof Download PDFInfo
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- CN110591224A CN110591224A CN201910801295.5A CN201910801295A CN110591224A CN 110591224 A CN110591224 A CN 110591224A CN 201910801295 A CN201910801295 A CN 201910801295A CN 110591224 A CN110591224 A CN 110591224A
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention relates to a polypropylene material and a preparation method thereof, a structural member and a manufacturing method thereof, wherein the polypropylene material is suitable for vibration friction welding, long-chain branched polypropylene with a specific proportion is added into linear homo-polypropylene, and due to the introduction of the long-chain branched polypropylene, a large amount of molecular chain entanglement is generated in the cooling process after vibration melting, so that a faster crystal nucleus generation rate is obtained, more crystal nuclei are formed, and the crystallinity of a material at the position of a welding line is improved; in addition, in the vibration melting process, due to the existence of the long-chain branched polypropylene, the orientation formed by linear polypropylene molecular chains in the vibration direction is relatively reduced, and the tensile strength of the material in the direction vertical to the vibration direction is favorably maintained.
Description
Technical Field
The invention relates to the technical field of vibration friction welding, in particular to a polypropylene material and a preparation method thereof, a structural member and a manufacturing method thereof.
Background
The vibration friction welding is a thermal welding, has high efficiency and low energy consumption, does not need to add solvents, adhesives or other auxiliary products during welding, has no surface damage to welding materials, is simple to operate, is convenient to realize mechanization and automation, is particularly suitable for preparing various irregular parts and products which cannot be molded by one-time injection molding or extrusion molding, such as vehicle kettles, anisotropic pipes and the like, and is widely applied to the fields of automobiles, electronics, aerospace and the like.
For some polypropylene special-shaped structural parts, such as automotive interior parts, one-time injection molding is difficult, a plurality of simple parts can be designed, and then the vibration friction welding is carried out to complete the integrated assembly. Polypropylene is a semi-crystalline polymer, and high amplitude, high welding pressure and long welding time are required to melt a welding surface to achieve welding, but this causes problems such as reduction in weld strength and strength retention. Specifically, at high amplitudes, the flow rate of the molten material is high, resulting in increased molecular chain orientation, the production of a large amount of flash, and reduced weld strength; when the welding pressure is high, part indentation, part deformation, flash and molecular orientation are easily generated, and the strength of a welding seam is reduced; the long welding time easily causes local overheating and leakage, causes the reduction of the strength of the welding seam, and has extremely low strength retention rate at the welding seam.
In order to improve the strength and strength retention rate of the weld joint in the vibration friction welding, the traditional method is to fill reinforcing fillers such as talcum powder and glass fiber in polypropylene, however, the density of the material is increased, which is not beneficial to lightening the final product, and a way of adding carbon fiber is adopted to reduce the density, but the material cost is greatly increased.
Disclosure of Invention
In view of the above, it is necessary to provide a polypropylene material, a preparation method thereof, a structural member and a manufacturing method thereof, so as to improve the weld strength and strength retention rate of polypropylene vibration friction welding.
The polypropylene material comprises raw materials of linear polypropylene, long-chain branched polypropylene and a heat stabilizer, wherein the mass ratio of the linear polypropylene to the long-chain branched polypropylene to the heat stabilizer is (79-98): 1-20): 1.
In one embodiment, the mass ratio of the linear polypropylene to the long-chain branched polypropylene to the heat stabilizer is (89-97): 2-10): 1.
In one embodiment, the linear polypropylene has a weight average molecular weight of 1 × 104～1×106The molecular weight distribution width is 1-20, and the melt flow rate at 230 ℃ is 0.1g/10 min-100 g/10 min.
In one embodiment, the linear polypropylene has a weight average molecular weight of 2 × 105～4×105The width of molecular weight distribution is 2-8, and the melt flow rate at 230 ℃ is 1g/10 min-10 g/10 min.
In one embodiment, the degree of branching of the long-chain branched polypropylene is 0.05-0.5, and the melt flow rate at 230 ℃ is 0.1-10 g/10 min.
In one embodiment, the degree of branching of the long-chain branched polypropylene is 0.2-0.4, and the melt flow rate at 230 ℃ is 1g/10 min-4 g/10 min.
In one embodiment, the heat stabilizer is selected from one or more of a phenolic heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenolic heat stabilizer, a thioester heat stabilizer, and a calixarene heat stabilizer.
In one embodiment, the heat stabilizer is a mixture of a phenol heat stabilizer, a phosphite heat stabilizer and a thioester heat stabilizer, and the mass ratio of the phenol heat stabilizer to the phosphite heat stabilizer to the thioester heat stabilizer is (1-3): 1-3 (1-3).
In one embodiment, the polypropylene material has a crystallinity of 45% to 55%, an elastic modulus of 1500MPa to 2000MPa, and a tensile strength of 30MPa to 45 MPa.
The preparation method of the polypropylene material of any embodiment comprises the following steps:
and adding the linear polypropylene, the long-chain branched polypropylene and the heat stabilizer into a screw extruder according to the mass ratio for melt mixing, extruding and granulating.
A structural member and a method of making the same, comprising the steps of:
vibration friction welding is performed using a plurality of parts, a plurality of which are made of the polypropylene material of any of the embodiments described above.
In one embodiment, the process parameters of the vibration friction welding include: the welding amplitude is 0.2 mm-1.5 mm, the welding pressure is 20 Bar-80 Bar, the welding depth is 0.2 mm-2 mm, the welding pressure maintaining pressure is 20 Bar-80 Bar, and the holding time is 1 s-20 s.
In one embodiment, after the step of vibration friction welding, the step of heat treatment of the welded part is further included.
In one embodiment, the heat treatment is heating for 1min to 60min within a range of 5 ℃ to 80 ℃ below the melting point of the polypropylene material.
In one embodiment, the heat treatment is heating in the range of 10 ℃ to 40 ℃ below the melting point of the polypropylene material for 5min to 30 min.
The structural member manufactured by the manufacturing method of any one of the above embodiments.
Compared with the prior art, the polypropylene material, the preparation method thereof, the structural member and the manufacturing method thereof have the following beneficial effects:
the polypropylene material is suitable for vibration friction welding, and is prepared by adding long-chain branched polypropylene with a specific proportion into linear polypropylene, so that a large amount of molecular chain entanglement is generated in the cooling process after vibration melting due to the introduction of the long-chain branched polypropylene, a faster crystal nucleus generation rate is obtained, more crystal nuclei are formed, and the crystallinity of the material at the position of a welding seam is improved; in addition, in the vibration melting process, due to the existence of the long-chain branched polypropylene, the orientation formed by linear polypropylene molecular chains in the vibration direction is relatively reduced, and the tensile strength of the material in the direction vertical to the vibration direction is favorably maintained.
In addition, according to the manufacturing method of the structural member, after welding, further heat treatment is carried out, and due to the existence of long-chain branched polypropylene, a large number of molecular chains are tangled at the welding seam in the further heat treatment process, so that the crystallization of a polypropylene material at the welding seam can be more perfect, and the strength retention rate of the welding seam are further improved.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a polypropylene material, which comprises raw materials of linear polypropylene, long-chain branched polypropylene and a heat stabilizer, wherein the mass ratio of the linear polypropylene to the long-chain branched polypropylene to the heat stabilizer is (79-98): 1-20): 1.
According to the invention, long-chain branched polypropylene with a specific proportion is added into linear homo-polypropylene, and due to the introduction of the long-chain branched polypropylene, a large amount of molecular chain entanglement is generated in the cooling process after vibration melting, so that a faster crystal nucleus generation rate is obtained, more crystal nuclei are formed, and the crystallinity of a welding seam position material is improved; in addition, in the vibration melting process, due to the existence of the long-chain branched polypropylene, the orientation formed by linear polypropylene molecular chains in the vibration direction is relatively reduced, and the tensile strength of the material in the direction vertical to the vibration direction is favorably maintained.
The long-chain branched polypropylene is lower than the proportion, so that the strength retention rate of the polypropylene vibration friction weld is difficult to improve and cannot be reflected; above this ratio, long-chain branched polypropylene has a poor dispersion effect in linear polypropylene, and at the same time, the inherent mechanical properties of polypropylene materials are also reduced.
In one embodiment, the mass ratio of the linear polypropylene to the long-chain branched polypropylene to the heat stabilizer is (89-97): 2-10): 1. In the embodiment, the proportion of the components is further optimized, so that the effect of the polypropylene material on improving the strength and strength retention rate of the weld joint in the vibration friction welding is better.
In one embodiment, the linear polypropylene has a weight average molecular weight of 1 × 104～1×106The width of molecular weight distribution is 1-20, and the melt flow rate is 0.1g/10 min-100 g/10min at 230 ℃ and under the condition of a load of 2.16 kg.
In one embodiment, the linear polypropylene has a weight average molecular weight of 2X 105～4×105The width of molecular weight distribution is 2-8, and the melt flow rate is 1g/10 min-10 g/10min under the conditions of 230 ℃ and 2.16kg of load.
In one embodiment, the degree of branching of the long-chain branched polypropylene is 0.05-0.5, and the melt flow rate under the conditions of 230 ℃ and a load of 2.16kg is 0.1-10 g/10 min.
Further, in one embodiment, the branching degree of the long-chain branched polypropylene is 0.2-0.4, and the melt flow rate under the conditions of 230 ℃ and 2.16kg load is 1g/10 min-4 g/10 min.
Optionally, the heat stabilizer may be one or more of a phenol heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenol heat stabilizer, a thioester heat stabilizer and a calixarene heat stabilizer.
In one embodiment, the heat stabilizer is a mixture of a phenol heat stabilizer, a phosphite heat stabilizer and a thioester heat stabilizer, and the mass ratio of the phenol heat stabilizer to the phosphite heat stabilizer to the thioester heat stabilizer is (1-3): (1-3): 1-3. Further, in one embodiment, the heat stabilizer is the heat stabilizer 1010, the heat stabilizer 168 and the heat stabilizer DSTP in a mass ratio of (1-3): (1-3), and the material system of the present invention can be well adapted to have an excellent heat stabilizing effect.
In one embodiment, the polypropylene material has a crystallinity of 45% to 55%, an elastic modulus of 1500MPa to 2000MPa, and a tensile strength of 30MPa to 45 MPa.
Further, the present invention provides a method for preparing the polypropylene material according to any one of the above embodiments, which comprises the following steps:
adding linear polypropylene, long-chain branched polypropylene and a heat stabilizer into a screw extruder according to the mass ratio for melt mixing, and extruding and granulating.
The mixing equipment can be a double-screw extruder. In one embodiment, the temperature of each section of the twin-screw extruder is set to 190 ℃ to 240 ℃. Further, in one embodiment, the temperature of each section of the twin-screw extruder is set to be 200 ℃ to 220 ℃.
Further, the invention also provides a method for manufacturing a structural member, which comprises the step of performing vibration friction welding on a plurality of parts, wherein the plurality of parts are made of the polypropylene material in any one embodiment.
In one embodiment, in the vibration friction welding process, the welding amplitude is 0.2 mm-1.5 mm, the welding pressure is 20 Bar-80 Bar, the welding depth is 0.2 mm-2 mm, the welding pressure maintaining pressure is 20 Bar-80 Bar, and the holding time is 1 s-20 s.
In one embodiment, in the vibration friction welding process, the welding amplitude is 0.6 mm-0.9 mm, the welding pressure is 30 Bar-50 Bar, the welding depth is 0.6 mm-1.2 mm, the welding pressure maintaining pressure is 30 Bar-50 Bar, and the holding time is 4 s-10 s.
In one embodiment, after the step of vibration friction welding, the structural member and method of making the same further comprises the step of heat treating the weld.
In one embodiment, the heat treatment is performed in a heating range of 5 ℃ to 80 ℃ below the melting point of the polypropylene material for 1min to 60 min. Further, in one embodiment, the heat treatment is heating for 5min to 30min in a range of 10 ℃ to 40 ℃ below the melting point of the polypropylene material. After welding, through further heat treatment, due to the existence of long-chain branched polypropylene, a large amount of molecular chain entanglement is generated at the welding seam in the further heat treatment process, so that the crystallization of polypropylene materials at the welding seam can be more perfect, and the strength retention rate of the welding seam are further improved.
Further, the invention also provides a structural component which is manufactured by the manufacturing method of the structural component of any one of the embodiments.
The polypropylene material is suitable for vibration friction welding, and is prepared by adding long-chain branched polypropylene with a specific proportion into linear polypropylene, so that a large amount of molecular chain entanglement is generated in the cooling process after vibration melting due to the introduction of the long-chain branched polypropylene, a faster crystal nucleus generation rate is obtained, more crystal nuclei are formed, and the crystallinity of the material at the position of a welding seam is improved; in addition, in the vibration melting process, due to the existence of the long-chain branched polypropylene, the orientation formed by linear polypropylene molecular chains in the vibration direction is relatively reduced, and the tensile strength of the material in the direction vertical to the vibration direction is favorably maintained.
In addition, according to the manufacturing method of the structural member, after welding, further heat treatment is carried out, and due to the existence of long-chain branched polypropylene, a large number of molecular chains are tangled at the welding seam in the further heat treatment process, so that the crystallization of a polypropylene material at the welding seam can be more perfect, and the strength retention rate of the welding seam are further improved.
The present invention is further illustrated by the following specific examples.
Example 1
The weight average molecular weight is 3.2X 105Linear homopolypropylene with the molecular weight distribution width of 4.7 and the melt flow rate of 2.3g/10min, long-chain branched polypropylene with the melt flow rate of 2.4g/10min and the branching degree of 0.24, and a heat stabilizer (a heat stabilizer 1010, a heat stabilizer 168 and a heat stabilizer DSTP in a mass ratio of 1:1:1) are melted, blended and granulated on a double-screw extruder according to the mass ratio of 97:2: 1. And then, performing injection molding on an injection molding machine to form a corresponding mechanical tensile sample and a sample 1 for welding, welding the sample 1 under a certain vibration friction welding process to form a sample 2, and performing heat treatment on the sample 2 at a certain temperature to obtain a final sample 3. The process conditions are as follows: extrusion temperature 210 ℃, injection molding temperature 210 ℃, vibration welding amplitude 0.9mm, welding depth 1.2mm, welding pressure 40Bar, welding pressure maintaining 35Bar, welding holding time 10s, and heat treatment of welded sample 2 at 140 ℃ for 30 min.
Example 2
The weight average molecular weight is 3.2X 105Linear homopolypropylene with the molecular weight distribution width of 4.7 and the melt flow rate of 2.3g/10min, long-chain branched polypropylene with the melt flow rate of 2.4g/10min and the branching degree of 0.24, and a heat stabilizer (a heat stabilizer 1010, a heat stabilizer 168 and a heat stabilizer DSTP in a mass ratio of 1:1:1) are melted, blended and granulated on a double-screw extruder according to a mass ratio of 94:5: 1. And then, performing injection molding on an injection molding machine to form a corresponding mechanical tensile sample and a sample 1 for welding, welding the sample 1 under a certain vibration friction welding process to form a sample 2, and performing heat treatment on the sample 2 at a certain temperature to obtain a final sample 3. The process conditions are as follows: extrusion temperature 210 ℃, injection molding temperature 210 ℃, vibration welding amplitude 0.9mm, welding depth 1.2mm, welding pressure 40Bar, welding pressure maintaining 35Bar, welding holding time 10s, and heat treatment of welded sample 2 at 140 ℃ for 30 min.
Example 3
The weight average molecular weight is 3.2X 105Linear homopolypropylene having a molecular weight distribution breadth of 4.7 and a melt flow rate of 2.3g/10min, long-chain branched polypropylene having a melt flow rate of 2.4g/10min and a branching degree of 0.24, and a heat stabilizer: (The mass ratio of the heat stabilizer 1010 to the heat stabilizer 168 to the heat stabilizer DSTP is 1:1:1), and the components are melted, blended and granulated on a double-screw extruder according to the mass ratio of 91:8: 1. And then, performing injection molding on an injection molding machine to form a corresponding mechanical tensile sample and a sample 1 for welding, welding the sample 1 under a certain vibration friction welding process to form a sample 2, and performing heat treatment on the sample 2 at a certain temperature to obtain a final sample 3. The process conditions are as follows: extrusion temperature 210 ℃, injection molding temperature 210 ℃, vibration welding amplitude 0.9mm, welding depth 1.2mm, welding pressure 40Bar, welding pressure maintaining 35Bar, welding holding time 10s, and heat treatment of welded sample 2 at 140 ℃ for 30 min.
Example 4
The weight average molecular weight is 3.2X 105Linear homopolypropylene with the molecular weight distribution width of 4.7 and the melt flow rate of 2.3g/10min, long-chain branched polypropylene with the melt flow rate of 2.4g/10min and the branching degree of 0.24, and a heat stabilizer (a heat stabilizer 1010, a heat stabilizer 168 and a heat stabilizer DSTP in a mass ratio of 2:3:3) are melted, blended and granulated on a double-screw extruder according to a mass ratio of 79:20: 1. And then, performing injection molding on an injection molding machine to form a corresponding mechanical tensile sample and a sample 1 for welding, welding the sample 1 under a certain vibration friction welding process to form a sample 2, and performing heat treatment on the sample 2 at a certain temperature to obtain a final sample 3. The process conditions are as follows: extrusion temperature 210 ℃, injection molding temperature 210 ℃, vibration welding amplitude 0.9mm, welding depth 1.2mm, welding pressure 40Bar, welding pressure maintaining pressure 35Bar, welding holding time 10s, and heat treatment of welded sample 2 at 150 ℃ for 5 min.
Example 5
The weight average molecular weight is 3.2X 105Linear homopolymerized propylene with molecular weight distribution width of 4.7 and melt flow rate of 2.3g/10min, long-chain branched polypropylene with melt flow rate of 8.2g/10min and branching degree of 0.1, and a heat stabilizer (heat stabilizer 1010, heat stabilizer 168 and heat stabilizer DSTP with the mass ratio of 1:1:1) are melted, blended and granulated on a double-screw extruder according to the mass ratio of 97:2: 1. Then, corresponding mechanical tensile samples and a sample 1 for welding are formed on an injection molding machine in an injection molding mode,the sample 1 is welded to form a sample 2 under a certain vibration friction welding process, and the sample 2 is subjected to heat treatment at a certain temperature to obtain a final sample 3. The process conditions are as follows: extrusion temperature 210 ℃, injection molding temperature 210 ℃, vibration welding amplitude 0.9mm, welding depth 1.2mm, welding pressure 40Bar, welding pressure maintaining 35Bar, welding holding time 10s, and heat treatment of welded sample 2 at 140 ℃ for 30 min.
Comparative example 1
Comparative example 1 is essentially the same procedure as in example 1 except that sample 1 does not contain long chain branched polypropylene and the mass ratio of linear homopolypropylene to thermal stabilizer is 99: 1.
Comparative example 2
Comparative example 2 is essentially the same procedure as in example 1 except that the mass ratio of linear polypropylene, long chain branched polypropylene and thermal stabilizer in sample 1 is 74:25: 1.
Comparative example 3
Comparative example 3 is substantially the same procedure as example 2 except that sample 2 after welding is not heat treated.
The samples of the examples and comparative examples were tested and the results are shown in table 1.
TABLE 1
As can be seen from the comparison between the example 1 and the comparative example 1, the mechanical property and the crystallinity of the material are improved by adding the long-chain branched polypropylene into the linear polypropylene, the weld strength of the welded sample is kept above 25MPa after the heat treatment, and the weld strength retention rate is above 80%.
From the example 1 and the comparative example 2, when the content of the long-chain polypropylene is 25%, the long-chain polypropylene plays a certain leading role in the system, so that the crystallinity of the polypropylene is low, the elastic modulus and the tensile strength mechanical property are reduced, and the weld strength retention rate of the final welding sample are reduced.
As can be seen from comparison between example 2 and comparative example 3, after the welded sample is subjected to heat treatment at 140 ℃ for 30min, the weld strength and weld strength retention rate are obviously higher than those of the welded sample which is not subjected to heat treatment, which indicates that the heat treatment process can enable the crystallization of the polypropylene material at the welded joint to be more complete.
The test methods for the samples in the above examples and comparative examples are as follows:
(1) degree of crystallinity
The DSC crystalline melting curve of the cast base film was measured using a Differential Scanning Calorimeter (DSC). The test conditions were: n is a radical of2The sample was heated from room temperature to 210 ℃ at a temperature of 10 ℃/min under an atmosphere of about 5mg in mass, a DSC crystal melting curve was recorded, the melting temperature (Tm) and the enthalpy of fusion (Δ H) of the sample were obtained from the curve, and the crystallinity (X) of the sample was calculated from the following equationc) And wafer thickness (L):
wherein, Delta H is the melting enthalpy value of the sample, J/g; Δ H0Is the melting enthalpy value of 100% crystallization of polypropylene, and the value is 207J/g.
(2) Modulus of elasticity, tensile Strength
According to the GB/T1040 test requirements, the elastic modulus E of a polypropylene material (injection molded into a 1A type sample strip) is measured at room temperature by using a material electronic universal testerTAnd tensile strength σM：
σM＝Pmax/(b·d)
ET＝(σ2-σ1)/(ε2-ε1)
In the formula, σMIs tensile strength (MPa), PmaxIs the maximum load force (N) during stretching; b is the specimen width and d is the specimen thickness; eTMeans the modulus of elasticity (MPa), ε1ε2Is referred to as tensile strain (. epsilon.)1＝0.0005，ε2＝0.0025)，σ1σ2Means tensile strain ε1ε2Corresponding tensile stress.
(3) Strength of weld
Weld strength measured at room temperature using a materials electronics universal tester:
FM＝Pmax/(b·d)
in the formula, FMIs the weld strength (MPa), PmaxIs the maximum load force (N) during stretching; b is the specimen width and d is the specimen thickness;
(4) retention of weld strength
Wherein A is a weld strength retention ratio (%), FMIs the weld strength, σMIs the corresponding material tensile strength.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (16)
1. The polypropylene material is characterized in that raw materials of the polypropylene material comprise linear polypropylene, long-chain branched polypropylene and a heat stabilizer, and the mass ratio of the linear polypropylene to the long-chain branched polypropylene to the heat stabilizer is (79-98): 1-20): 1.
2. The polypropylene material according to claim 1, wherein the mass ratio of the linear polypropylene, the long-chain branched polypropylene and the heat stabilizer is (89-97): 2-10): 1.
3. The polypropylene material of claim 1 or 2, wherein the linear polypropylene has a weight average molecular weight of 1 x 104～1×106The molecular weight distribution width is 1-20, and the melt flow rate at 230 ℃ is 0.1g/10 min-100 g/10 min.
4. The polypropylene material of claim 3, wherein the linear polypropylene has a weight average molecular weight of 2 x 105～4×105The width of molecular weight distribution is 2-8, and the melt flow rate at 230 ℃ is 1g/10 min-10 g/10 min.
5. The polypropylene material of any one of claims 1, 2, 4, wherein the long chain branched polypropylene has a degree of branching of 0.05 to 0.5 and a melt flow rate of 0.1g/10min to 10g/10min at 230 ℃.
6. The polypropylene material of claim 5, wherein the long chain branched polypropylene has a degree of branching of from 0.2 to 0.4 and a melt flow rate at 230 ℃ of from 1g/10min to 4g/10 min.
7. The polypropylene material according to any one of claims 1, 2, 4 and 6, wherein the heat stabilizer is one or more selected from the group consisting of a phenolic heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenolic heat stabilizer, a thioester heat stabilizer and a calixarene heat stabilizer.
8. The polypropylene material according to claim 7, wherein the heat stabilizer is a mixture of a phenolic heat stabilizer, a phosphite heat stabilizer and a thioester heat stabilizer, and the mass ratio of the phenolic heat stabilizer to the phosphite heat stabilizer to the thioester heat stabilizer is (1-3): 1-3: (1-3).
9. The polypropylene material according to any one of claims 1, 2, 4, 6, 8, wherein the polypropylene material has a crystallinity of 45% to 55%, an elastic modulus of 1500MPa to 2000MPa and a tensile strength of 30MPa to 45 MPa.
10. The method for preparing a polypropylene material according to any one of claims 1 to 9, comprising the steps of:
and adding the linear polypropylene, the long-chain branched polypropylene and the heat stabilizer into a screw extruder according to the mass ratio for melt mixing, extruding and granulating.
11. A structural member and a method of making the same, comprising the steps of:
vibration friction welding using a plurality of parts, a plurality of said parts being made of a polypropylene material according to any one of claims 1 to 9.
12. The method of manufacturing of claim 11, wherein the process parameters of the vibration friction welding include: the welding amplitude is 0.2 mm-1.5 mm, the welding pressure is 20 Bar-80 Bar, the welding depth is 0.2 mm-2 mm, the welding pressure maintaining pressure is 20 Bar-80 Bar, and the holding time is 1 s-20 s.
13. The method of manufacturing according to claim 11 or 12, further comprising a step of heat-treating the welded portion after the step of vibration friction welding.
14. The method of claim 13, wherein the heat treatment is performed at a temperature of 5 ℃ to 80 ℃ below the melting point of the polypropylene material for 1min to 60 min.
15. The method of claim 14, wherein the heat treatment is performed at 10 to 40 ℃ below the melting point of the polypropylene material for 5 to 30 minutes.
16. A structural member manufactured by the method of any one of claims 11 to 15.
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