CN116790064A - Stretch-resistant necked polypropylene composite material and preparation method and application thereof - Google Patents
Stretch-resistant necked polypropylene composite material and preparation method and application thereof Download PDFInfo
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- CN116790064A CN116790064A CN202310465057.8A CN202310465057A CN116790064A CN 116790064 A CN116790064 A CN 116790064A CN 202310465057 A CN202310465057 A CN 202310465057A CN 116790064 A CN116790064 A CN 116790064A
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- -1 polypropylene Polymers 0.000 title claims abstract description 82
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 76
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 70
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 229920000570 polyether Polymers 0.000 claims abstract description 29
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 28
- 239000012745 toughening agent Substances 0.000 claims abstract description 28
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 27
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 27
- 239000000155 melt Substances 0.000 claims abstract description 17
- 229920001400 block copolymer Polymers 0.000 claims abstract description 11
- 239000003963 antioxidant agent Substances 0.000 claims description 20
- 230000003078 antioxidant effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 3
- 150000002989 phenols Chemical class 0.000 claims description 3
- 150000008301 phosphite esters Chemical group 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 14
- 229920000642 polymer Polymers 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000001746 injection moulding Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 230000002087 whitening effect Effects 0.000 description 4
- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical compound ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920005606 polypropylene copolymer Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229920000587 hyperbranched polymer Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L23/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application discloses an anti-stretching and necking polypropylene composite material and a preparation method and application thereof, and belongs to the technical field of polymers. The stretch-proof necked polypropylene composite material comprises the following components in parts by weight: 82-96 parts of polypropylene, 4-13 parts of toughening agent, 0-8 parts of compatilizer and 0-5 parts of polyether; the toughening agent is linear low-density polyethylene, and the mass flow rate of the melt of the linear low-density polyethylene is 1-5 g/10min under the conditions of 190 ℃ and 2.16 kg; the compatilizer is propylene-ethylene block copolymer. According to the application, the linear low-density polyethylene is selected as the toughening agent, so that the yield elongation and the bending part width of the polypropylene composite material can be improved.
Description
Technical Field
The application belongs to the technical field of high polymer materials, and particularly relates to a stretch-resistant necked polypropylene composite material, and a preparation method and application thereof.
Background
The polypropylene has the advantages of low cost, good comprehensive performance, rich raw material resources, environmental protection, no toxicity, easy recovery and the like, and is often adopted as a raw material for injection molding into different parts in general life of automobile decoration parts and household appliances, however, the PP tubular parts are stretched and necked when being bent, so that uneven fluctuation of the surface of the materials is caused, and the use of the parts is affected. In the prior art, the stress whitening resistance of PP is mainly improved, for example, a mixed dispersing agent obtained by compounding polyvinyl alcohol and alkylphenol polyoxyethylene is selected in patent 'low Wen Wanshe whitening resistance polypropylene composite', so that the dispersibility of POE in a polypropylene matrix is improved, the low-temperature bending whitening resistance of the polypropylene material is improved, but the low-temperature bending whitening resistance is not high, and the tensile necking resistance of polypropylene is not represented; the bending resistance of the composite material is improved by adding the alpha nucleating agent, and the fluidity of the composite material is improved by adding the hyperbranched polymer, but the polypropylene composite material has poorer stretching and necking resistance due to more raw materials and difficult processing in the patent; there is now a need to develop a polypropylene composite with stretch-resistant necking.
Disclosure of Invention
The application aims to overcome the defects of the prior art, provides a stretch-and-neck-resistant polypropylene composite material, and a preparation method and application thereof, and solves the problems that uneven surface fluctuation caused by a stretch-and-neck phenomenon occurs when a PP tubular part is bent, and the use of the part is affected.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
an anti-stretching necked polypropylene composite material comprises the following components in parts by weight: 82-96 parts of copolymerized polypropylene, 4-13 parts of toughening agent, 0-8 parts of compatilizer and 0-5 parts of polyether; the toughening agent is linear low-density polyethylene, and the mass flow rate of the melt of the linear low-density polyethylene is 1-5 g/10min under the conditions of 190 ℃ and 2.16 kg; the compatilizer is propylene-ethylene block copolymer.
The problem of necking can be caused by slippage between molecular chains in the stretching process of a polypropylene material, the larger the yield elongation is, the longer the elastic phase of the material is, and the later the necking is caused, so that the improvement of the yield elongation of the material is a key point for improving the necking phenomenon. In the stretch-proof necked polypropylene composite material, the addition of the toughening agent can improve the yield elongation and the bending part width of the polypropylene composite material. When the melt mass flow rate of the linear low-density polyethylene is in the range, the linear low-density polyethylene has narrow molecular weight distribution, regular structure and good mechanical property, and can effectively improve the mechanical property and the stretch-necking resistance of the polypropylene composite material. The melt mass flow rate of the linear low-density polyethylene is one of key factors influencing the performance of the product, and the melt mass flow rate of the linear low-density polyethylene is too high, so that the mechanical property and the stretch-necking resistance of the product are obviously reduced. If homo-polypropylene is used instead of co-polypropylene, the resulting product has better stretch-necking resistance, but other properties of the product are not satisfactory, wherein the impact properties, especially low temperature impact properties, of the product are mainly affected.
According to the application, the propylene-ethylene block copolymer is selected as the compatilizer, so that the compatibility between the polypropylene and the toughening agent is improved, and the yield elongation and the bending part width of the polypropylene composite material are further improved. In addition, polyether is a linear polymer prepared by ring-opening homo-polymerization or copolymerization of monomers such as ethylene oxide, propylene oxide, butylene oxide and the like serving as raw materials under the action of a catalyst; the inventor finds that the softness of the polypropylene composite material chain segment can be improved by adding polyether into the system, so that the yield elongation and the bending part width of the polypropylene composite material are further improved, and the stretching necking phenomenon of the polypropylene material is improved.
Conventional commercially available copolymerized polypropylene having a melt mass flow rate in the range of 1 to 20g/10min at 230℃and 2.16kg may be used in the present application.
It should be noted that the melt mass flow rate of the copolymer polypropylene of the present application was measured according to the method of ISO 1133-2011.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, the toughening agent is present in an amount of from 8 to 12 parts by weight.
The inventor of the present application found through further research that the content of the toughening agent is an important factor affecting the polypropylene composite material; if the content of the toughening agent is too small, the yield elongation and the width improvement degree of the bending part of the polypropylene composite material are low; if the content of the toughening agent is too much, the beneficial effect of the product is not further increased or even reduced.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, the polyether is present in an amount of from 2 to 3 parts by weight; the content of the compatilizer is 3-5 parts by weight.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, said polyether has an average molecular weight of 1100-9000; preferably, the polyether has an average molecular weight of 2000-8350.
In the application, the method for testing the average molecular weight of polyether comprises the following steps: polyether was added to 1,2, 4-trichlorobenzene and dissolved completely at 145 ℃ to prepare a 2mg/mL solution, and the resulting solution was tested on a high temperature gel chromatograph equipped with an ultraviolet detector at a rinse rate of 1mL/min.
In the polypropylene composite material, the addition amount or molecular weight of polyether can also influence the performance of the polypropylene composite material, for example, the addition amount of polyether is too much, and the beneficial effect of the product is not obviously increased. The molecular weight of the polyether is too small, and the yield elongation and the width of the bending part of the product cannot be obviously improved.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, propylene-ethylene block copolymersThe density of the polymer is 0.879-0.910g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The mass flow rate of the propylene-ethylene copolymer is 1-30 g/10min under the condition of 230 ℃ and 2.16 kg. Preferably, the propylene-ethylene block copolymer has a density of 0.88 to 0.89g/cm 3 。
It should be noted that the melt mass flow rate of the propylene-ethylene block copolymer in the present application is measured according to the method of ISO 1133-2011.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, said linear low density polyethylene has a density of from 0.910 to 0.930g/cm 3 。
The density of the propylene-ethylene block copolymer and the density of the linear low density polyethylene in the present application were tested under the conditions of 23℃in accordance with ISO 1183-2019.
As a preferred embodiment of the stretch-necked polypropylene composite of the present application, the stretch-necked polypropylene composite further comprises from 0.5 to 2 parts by weight of a black matrix and from 0.2 to 0.8 parts by weight of an antioxidant.
As a preferred embodiment of the stretch-proof necked polypropylene composite material, the antioxidants are a main antioxidant and an auxiliary antioxidant; the main antioxidant is hindered phenols; the auxiliary antioxidant is phosphite ester.
The main antioxidant and the auxiliary antioxidant are added in the application to improve the stability of the polypropylene composite material. Optionally, the mass ratio of the main antioxidant to the auxiliary antioxidant is 1:1.
another object of the present application is to provide a method for preparing the stretch-necked polypropylene composite material comprising the steps of: the components are evenly mixed according to the proportion, and then are melted, extruded and granulated at 180-220 ℃ to obtain the stretch-resistant necked polypropylene composite material.
Preferably, the mixing is performed in a high speed mixer with a rotational speed of 700-800rpm.
Preferably, the extrusion is carried out in a twin-screw extruder with a rotation speed of 400-450rpm and an aspect ratio of 48:1
It is a further object of the present application to provide the use of said stretch-necked polypropylene composite material for the preparation of automotive parts.
Preferably, the automobile parts are an automobile brake pipe and a cooling pipe.
Compared with the prior art, the application has the beneficial effects that: the application adopts the linear low density polyethylene as the toughening agent, improves the toughness of the polypropylene composite material, solves the necking problem of the polypropylene material, and has the notch impact strength of 57-78KJ/m 2 The bending modulus is 907-1050MPa, the yield elongation is 9.5-18.8%, and the bending part width is 673-865 μm.
Drawings
FIG. 1 is a schematic diagram of a necking evaluation method in accordance with the present application.
Detailed Description
The objects, technical solutions and advantages of the present application will be further described with reference to specific examples and drawings, which are intended to be illustrative of the contents of the present application in detail, not limiting the present application. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present application. The experimental reagents and instruments involved in the practice of the present application are common reagents and instruments unless otherwise specified.
The following description of the raw materials used in the examples and comparative examples is provided, but is not limited to these materials:
polypropylene:
PP-1: the melt flow rate of the polypropylene copolymer, PP 3010, at 230 ℃ under a load of 2.16kg is 1.5g/10min, and the density is 0.90g/cm 3 Purchased from taiwan chemical fiber company, inc;
PP-2: the melt flow rate of the polypropylene copolymer, PP K9010, at 230 ℃ under 2.16kg load is 10.0g/10min, and the density is 0.90g/cm 3 Purchased from taiwan chemical fiber company, inc;
PP-3: the melt flow rate of the polypropylene copolymer, PP K9017, at 230 ℃ under a load of 2.16kg is 17.0g/10min, and the density is highThe degree of the reaction is 0.90g/cm 3 Purchased from taiwan chemical fiber company, inc;
toughening agent 1: linear low density polyethylene, LLDPE EXCEED 3518PA, melt flow rate at 190℃under 2.16kg load of 3.5g/10min, density of 0.913g/cm 3 Purchased from ExxonMobil;
toughening agent 2: linear low density polyethylene, LLDPE 5220G, melt flow rate at 190℃under 2.16kg load of 3.5g/10min, density of 0.915g/cm 3 Purchased from DOW;
toughening agent 3: linear low density polyethylene, LLDPE HP3518CN, melt flow rate at 190℃under 2.16kg load of 4.5g/10min, density of 0.918g/cm 3 Purchased from LG chemistry;
toughening agent 4: linear Low Density Polyethylene (LLDPE) LLDPE DFDA-7042 (ZHENHAI) having a melt flow rate of 1.5g/10min and a density of 0.915g/cm at 190℃under a load of 2.16kg 3 Purchased from land-sea refining;
toughening agent 5: linear low density polyethylene, LLDPE M2320, melt flow rate at 190℃under 2.16kg load of 20g/10min, density of 0.913g/cm 3 Purchased from chinese petrochemical company, inc;
toughening agent 6: ethylene-butene copolymer, POE ENGAGE 7467, melt flow rate at 190℃under 2.16kg load of 1.3g/10min, density of 0.862g/cm 3 Purchased from DOW;
toughening agent 7: low density polyethylene, LDPE 2426H,190 ℃ melt flow rate under 2.16kg load of 1.9g/10min, density of 0.925g/cm 3 Purchased from mesosea shell;
compatibilizer 1: propylene-ethylene Block copolymer, PE D5535.00, melt flow Rate at 230℃under a load of 2.16kg of 6.5g/10min, density of 0.879g/cm 3 Purchased from DOW;
compatibilizer 2: propylene-ethylene Block copolymer, PE D5545.00, melt flow Rate at 230℃under a load of 2.16kg of 9.5g/10min, density of 0.905g/cm 3 Purchased from DOW;
polyether 1: polyether L31 with an average molecular weight of 1100 is purchased from Nantong Chen wetting chemical Co., ltd;
polyether 2: polyether L61 with an average molecular weight of 2000 is purchased from Nantong Chen wetting chemical Co., ltd;
polyether 3: polyether L38 with an average molecular weight of 5000 is purchased from Nantong Chen wetting chemical Co., ltd;
polyether 4: polyether L68 with average molecular weight of 8350 is purchased from Nantong Chen wetting chemical Co., ltd;
black color master:PE2772KF with a density of 1.2g/cm 3 Melt mass flow rate at 190 ℃, under 21.6kg load, was 27g/10min, available from CABOT;
and (3) a main antioxidant: hindered phenols, antioxidants 1010, available from basf;
auxiliary antioxidant: phosphites, antioxidants 168, are available from basf.
Examples 1 to 20 and comparative examples 1 to 5
The components and parts by weight selections of the stretch-necked polypropylene composites of examples and comparative examples are shown in tables 1 and 2, wherein the preparation methods of the stretch-necked polypropylene composites of examples 1-20 and comparative examples 1-5 comprise the following steps:
adding the components into a high-speed mixer according to the proportion shown in the table 1 and the table 2 for mixing, wherein the rotating speed of the high-speed mixer is 700rpm, and uniformly mixing to obtain a mixture; then adding the mixture into a double-screw extruder, and carrying out melt extrusion and granulation at 180-220 ℃ (first area 80 ℃, second area 180 ℃, third area 200 ℃, fourth area 200 ℃, fifth area 210 ℃, sixth area 220 ℃, seventh area 220 ℃, eighth area 220 ℃) and rotating speed 450r/min to obtain the stretch-resistant necked polypropylene composite material.
TABLE 1 examples 1-12 content of components in the stretch-necked polypropylene composite (parts by weight)
TABLE 2 content of the components (parts by weight) in the stretch-necked polypropylene composites of examples 13-20 and comparative examples 1-5
Performance test:
the polypropylene composite materials prepared in the examples and the comparative examples are subjected to injection molding to obtain ISO mechanical splines, and after the injection molding, the ISO mechanical splines are subjected to performance test after being regulated for 24 hours in a standard environment (23 ℃ and 50% relative humidity), and specific test items and methods are as follows:
1. elongation at yield: the test is carried out by adopting a Germany ZWICK/Z010 universal material tester under the conditions that the test speed is 50mm/min, the clamp distance is 115mm and the test temperature is 23 ℃.
2. Flexural modulus: the test was performed at a test speed of 2mm/min and a test temperature of 23℃by injection molding into a sample strip (sample strip parameter: 80X 10X 4 mm) meeting the test requirements of ISO178-2014 standard flexural modulus.
3. Notched impact strength: the test is carried out by injection molding into a spline (spline parameters: 80X 8X 4mm, A-type notch) meeting the requirements of ISO179-2010 standard notch impact strength test and adopting a Germany ZWICK 5.5P pendulum impact tester under the condition that the test temperature is 23 ℃.
4. Necking evaluation method: the polypropylene composite materials prepared in the above examples and comparative examples were injection molded into parts and then bent, and after bending, the width of the necked portion was measured, and the severity of necking was evaluated according to the width, and the smaller the width, the more severe the necking (as shown in fig. 1).
The test results are shown in Table 3.
TABLE 3 Performance test results
As can be seen from Table 3, the polypropylene composite material of the present application has high mechanical properties (notched impact strength>59KJ/m 2 Flexural modulus>810 MPa) while also having excellent stretch-necking resistance (elongation at yield)>11.5% of the width of the bending part>710μm)。
From the comparison of comparative examples 1-2, the product has a lower elongation at yield and a lower bend region width, indicating that the problem of stretching and necking of polypropylene is serious without adding a toughening agent.
As is evident from the comparison of examples 1-3, the melt flow rate of polypropylene has a certain effect on the properties of the product, the melt flow rate is high, the stretch-necking resistance of the product is increased to a certain extent, and the mechanical properties are slightly reduced.
From the comparison of comparative examples 1-5, examples 1-2 and examples 4-6, the type of toughening agent affects the mechanical properties and stretch-necking resistance of the product, and when the toughening agent is linear low density polyethylene, the obtained product has better stretch-necking resistance; and the melt flow rate of the linear low-density polyethylene has a certain influence on the mechanical property and the stretch-necking resistance of the product, and the melt flow rate of the linear low-density polyethylene in the product of the comparative example 3 is higher, so that the mechanical property and the stretch-necking resistance of the obtained product are obviously reduced.
As can be seen from comparison of examples 1 and examples 7-9, the content of the toughening agent has a certain influence on the performance of the product, the content of the toughening agent is too small, and the yield elongation of the product and the width of the bending part are not obviously improved; the content of the toughening agent is too much, and the beneficial effect of the product is not obviously increased.
From a comparison of examples 1, 10-12 and 20, it is evident that the addition of compatibilizers or polyethers further improves the toughness and stretch-necking resistance of the product.
As can be seen from comparison of examples 10 and examples 13-19, the polyether can significantly improve the mechanical properties and stretch-necking resistance of the product, especially the average molecular weight of the polyether is 2000-8350, the mechanical properties and stretch-necking resistance of the product are significantly increased, and when the polyether content is up to 2 parts, the polyether content is further increased, so that the mechanical properties and stretch-necking resistance of the product are not significantly improved.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the application, and that those skilled in the art will understand that the technical scheme of the application may be modified or equally substituted without departing from the spirit and scope of the technical scheme of the application.
Claims (10)
1. The stretch-resistant necked polypropylene composite material is characterized by comprising the following components in parts by weight: 82-96 parts of copolymerized polypropylene, 4-13 parts of toughening agent, 0-8 parts of compatilizer and 0-5 parts of polyether; the toughening agent is linear low-density polyethylene, and the mass flow rate of the melt of the linear low-density polyethylene is 1-5 g/10min under the conditions of 190 ℃ and 2.16 kg; the compatilizer is propylene-ethylene block copolymer.
2. The stretch-necked polypropylene composite of claim 1, wherein said toughening agent is present in an amount of from 8 to 12 parts by weight.
3. The stretch-necked polypropylene composite of claim 1, wherein said polyether is present in an amount of from 2 to 3 parts by weight; the content of the compatilizer is 3-5 parts by weight.
4. The stretch-necked polypropylene composite of claim 1, wherein said polyether has an average molecular weight of 1100 to 9000; preferably, the polyether has an average molecular weight of 2000-8350.
5. The stretch-necked polypropylene composite of claim 1, wherein the propylene-ethylene block copolymer has a density of from 0.879 to 0.910g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The mass flow rate of the propylene-ethylene block copolymer is 1-30 g/10min under the condition of 230 ℃ and 2.16 kg.
6. The stretch-necked polypropylene composite of claim 1, wherein said linear low density polyethylene has a density of from 0.910 to 0.0.930g/cm 3 。
7. The stretch-necked polypropylene composite of claim 1, further comprising from 0.5 to 2 parts by weight of a black matrix and from 0.2 to 0.8 parts by weight of an antioxidant.
8. The stretch-necked polypropylene composite of claim 7, wherein said antioxidants are primary antioxidants and secondary antioxidants; the main antioxidant is hindered phenols; the auxiliary antioxidant is phosphite ester.
9. A process for preparing a stretch-necked polypropylene composite as defined in any one of claims 1 to 8, comprising the steps of: the components are evenly mixed according to the proportion, and then are melted, extruded and granulated at 180-220 ℃ to obtain the stretch-resistant necked polypropylene composite material.
10. Use of a stretch-proof necked polypropylene composite according to any of claims 1 to 8 for the preparation of automotive parts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310465057.8A CN116790064A (en) | 2023-04-26 | 2023-04-26 | Stretch-resistant necked polypropylene composite material and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310465057.8A CN116790064A (en) | 2023-04-26 | 2023-04-26 | Stretch-resistant necked polypropylene composite material and preparation method and application thereof |
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| Publication Number | Publication Date |
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| CN116790064A true CN116790064A (en) | 2023-09-22 |
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| CN202310465057.8A Pending CN116790064A (en) | 2023-04-26 | 2023-04-26 | Stretch-resistant necked polypropylene composite material and preparation method and application thereof |
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| Country | Link |
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| CN (1) | CN116790064A (en) |
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- 2023-04-26 CN CN202310465057.8A patent/CN116790064A/en active Pending
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