CN114672092B - Polypropylene composite material, and preparation method and application thereof - Google Patents
Polypropylene composite material, and preparation method and application thereof Download PDFInfo
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- 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- 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
- C08L23/12—Polypropene
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- 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
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Abstract
The invention discloses a polypropylene composite material, a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polypropylene composite material comprises the following components in parts by weight: 20-120 parts of polypropylene and 5-40 parts of filler; 0-30 parts of an elastomer; 2-10 parts of high molecular weight ethylene-propylene multi-block copolymer. The polypropylene composite material takes the high-flow polypropylene material as the main resin, and the high-molecular-weight copolymerized polypropylene with high rubber phase viscosity is added to play a role in obviously improving the melt elasticity, so that the good dispersion of the elastomer in two special polypropylene resins is facilitated, the obtained polymer melt has outstanding quick high crystallinity, outstanding melt flow stability and melt viscoelasticity, so that the appearance defects of rib marks and stress marks are well eliminated, and the rib mark rating and the stress mark rating can reach the level 1 standard.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a polypropylene composite material, a preparation method and application thereof.
Background
In recent years, with the development of the automobile industry, more and more plastic materials are applied to automobile interior and exterior parts, wherein polypropylene materials occupy a larger proportion of automobile plastic due to the advantages of excellent comprehensive performance, wide sources, excellent quality, low price and the like. Along with the increasing living standard of people, the attention degree of consumers to the details such as the appearance of the inner and outer decoration parts of the automobile is higher, the appearance evaluation standard of the automobile host factory to the inner and outer decoration parts is that no obvious appearance defect exists on the surface, the tiger skin lines are general attention problems, and other appearance problems are also very attention now, wherein rib position marks and stress marks are two common and troublesome injection molding piece appearance defect problems. The automotive parts have different levels of complexity, and in order to meet the requirements of ideal strength and rigidity, a certain number and shape of ribs are often arranged on the back of the parts. However, the existence of gluten positions on the back of the workpiece often leads to gluten position marks which are difficult to eliminate on the front of the workpiece, and the gluten position marks can be mostly only properly lightened by a technological means, but cannot be completely eliminated. The rib position marks become more obvious because the wall thickness of the rib position is uneven, so that the material is uneven in cold and hot shrinkage, the brightness of different areas is different, and the workpiece is pulled by stripping force during stripping.
In addition, the thickness difference of different parts of a large-sized workpiece is often existed in the prior art due to the actual use requirement, the thickness of the workpiece is not uniform, some workpieces are even designed to be gradually changed in wall thickness, however, the appearance defect of stress marks of the injection molded workpiece is easily caused by the change of the wall thickness, and the defect is also difficult to thoroughly eliminate by improving the process, and the problems caused by different flow rates of materials in the areas with different wall thicknesses of a die and uneven cold and hot shrinkage are also caused.
In summary, the rib marks and stress marks are difficult problems which are difficult to solve in the injection molding industry, almost no obvious improvement effect is achieved by adjusting injection molding process parameters, no good solution is found in the aspect of material formulation, and almost no relevant literature data are reported.
CN101914243a discloses a polypropylene composition for injection molding of automotive parts with good appearance and a preparation method thereof, the composition is prepared from the following components in percentage by weight: 50-78% of polypropylene resin; 2-20% of an elastomer; 2-10% of ethylene-propylene block copolymer; the balance of auxiliary agent. However, the appearance quality problem solved by the polypropylene composition is to eliminate the traditional tiger skin lines, and no viable solution is provided for the appearance defects of the tendon marks and stress marks.
Disclosure of Invention
The invention aims to solve the technical problems that the appearance defects of rib marks and stress marks exist in the injection molding of the existing polypropylene composition material when the plastic part is injection molded, and provides a polypropylene composite material, the melt elasticity is improved by combining the good fluidity of the main resin of the high-flow polypropylene material and the high-molecular-weight copolymerized polypropylene, meanwhile, the dispersion effect of an elastomer is improved by adding the high-molecular-weight ethylene-propylene multi-block copolymer, the appearance defects of the rib marks and the stress marks of the injection molding part are finally eliminated, and meanwhile, the rigidity and toughness balance is achieved.
The invention aims to provide a preparation method of a polypropylene composite material.
It is a further object of the present invention to provide the use of a polypropylene composite in injection molded plastic articles.
The above object of the present invention is achieved by the following technical scheme:
the polypropylene composite material comprises the following components in parts by weight:
20-120 parts of polypropylene and 5-40 parts of filler; 0-30 parts of an elastomer; 2-10 parts of high molecular weight ethylene-propylene multiblock copolymer;
wherein the polypropylene is a mixture of high molecular weight copolymerized polypropylene and high flow polypropylene, and the high molecular weight copolymerized polypropylene: the weight ratio of the high-flow polypropylene is 1:1-1:3;
wherein the weight average molecular weight of the high molecular weight copolymerized polypropylene is 100-200 ten thousand, the melt mass flow rate is 10-100 g/10min, and the test standard ISO1133-1-2011, 230 ℃ and 2.16Kg load are adopted; the melt mass flow rate of the high-flow polypropylene is 30-150 g/10min, and the test standard ISO1133-1-2011 is 230 ℃ and the load of 2.16 Kg;
the weight average molecular weight Mw of the high molecular weight ethylene-propylene segmented copolymer is 20000-60000, the molecular weight distribution Mw/Mn is 5-30, the melt mass flow rate is 0.5-10 g/10min, the test standard ISO1133-1-2011, 190 ℃ and 2.16Kg load.
The following description is needed:
the filler of the invention can be one or more of talcum powder, calcium carbonate, wollastonite and whisker.
In the polypropylene composite material, the high-flow polypropylene material serving as the main resin has good flow property, can quickly fill cavities with different wall thicknesses and realize quick cooling and shaping, the high-molecular-weight copolymerized polypropylene added according to a certain proportion on the basis has high rubber phase viscosity, can play a role in obviously improving the elasticity of a melt, is beneficial to controlling the unstable flow state of a polymer melt due to the change of a pressure field or a temperature field, and the addition of the high-molecular-weight ethylene-propylene multiblock copolymer is beneficial to realizing good dispersion of an elastomer in two polypropylene resins, so that the obtained polymer melt has outstanding quick cooling and shaping capability, and has outstanding melt flow stability and melt viscoelasticity, can not cause uneven material cold and hot shrinkage due to abrupt change of wall thickness, abrupt change of temperature and the like, and the obtained product of injection molding has good appearance effect, and is particularly suitable for a part with a large number of reinforcing rib positions with different wall thicknesses and a part with large change.
The high molecular weight copolymerized polypropylene has higher flexural modulus and cantilever beam notch impact strength, and the addition of the high molecular weight ethylene-propylene segmented copolymer is beneficial to realizing good microcosmic phase dispersion effect of the elastomer in the polypropylene resin, and the modulus of the composition is not reduced on the basis of ensuring good toughening effect of the elastomer, so that a better rigidity-toughness balance effect is achieved.
And high molecular weight copolymerized polypropylene: the weight ratio of the high-flow polypropylene is 1:1-1:3, the fluidity of the mixture with too small ratio is too low, and the melt can not fill the cavity rapidly and cool and fix, so that appearance defects can be caused. If the proportion is too large, the content of the high molecular weight polypropylene copolymer is low, the melt elasticity is insufficient, unstable flow is easy to occur due to the change of a pressure field or a temperature field, and the appearance effect is also influenced. And the higher the content of the high-flow polypropylene, the more rigid and the lower the toughness, within the scope of the present invention.
Preferably, the composition comprises the following components in parts by weight:
30-90 parts of polypropylene and 10-20 parts of filler; 5-20 parts of an elastomer; 3-5 parts of high molecular weight ethylene-propylene multi-block copolymer.
Preferably, the melt mass flow rate of the high molecular weight polypropylene copolymer is 30-60 g/10min, and the test standard ISO1133-1-2011, 230 ℃ and 2.16Kg load.
The melt mass flow rate of the polymer characterizes the flowability, i.e. the processing performance, of the polymer, the higher the melt mass flow rate is, the better the processing flowability is, the wider the range of selectable adjustment of the injection molding process is, and the operable space on the injection molding process is provided for eliminating rib marks and stress marks.
Preferably, the high-flow polypropylene has a melt mass flow rate of 50-100 g/10min, test standard ISO1133-1-2011, 230 ℃,2.16Kg load.
Preferably, the high molecular weight ethylene-propylene multiblock copolymer has a weight average molecular weight Mw of 40000 to 50000 and a molecular weight distribution Mw/Mn of 10 to 20.
The weight average molecular weight and the related molecular weight distribution of the high molecular weight ethylene-propylene multi-block copolymer are controlled to be beneficial to realizing better dispersibility of the whole material, so that the appearance defects of rib marks and stress marks of the prepared plastic parts are eliminated.
Preferably, the high molecular weight ethylene-propylene multi-block copolymer has a melt mass flow rate of 1.0-3.0 g/10min, test standard ISO1133-1-2011, 230 ℃,2.16Kg load.
Preferably, the elastomer is one or more of an ethylene-propylene copolymer, an ethylene-octene copolymer, an ethylene-butene copolymer, and an ethylene-propylene-octene terpolymer.
In the specific polypropylene composite material preparation application, 0.05-5 parts of processing aid by weight part can be added.
The processing aid can be one or more of pigment, antioxidant, weather-proof agent and nucleating agent.
Wherein, in a specific embodiment, the pigment of the present invention may be: organic or inorganic pigments.
The inorganic pigment can be titanium white, chrome yellow, cadmium yellow, molybdenum chrome red, iron red (yellow), cadmium red, ultramarine, cobalt blue, iron blue, chrome green, cobalt green, metal powder, mica pearlescent, carbon black and the like; the organic pigment may be azo, color pyridine, phthalocyanine, dye, etc.
The antioxidant can be hindered phenol antioxidant, phosphite antioxidant, etc.
The weathering agent may be a hindered amine weathering agent.
The lubricant may be calcium stearate, zinc stearate, and the like.
The invention also specifically protects a preparation method of the polypropylene composite material, which comprises the following steps:
uniformly mixing polypropylene, filler, elastomer and high molecular weight ethylene-propylene multiblock copolymer, adding into an extruder, melting and mixing at 170-240 ℃, granulating, cooling and drying to obtain the polypropylene composite material.
The extruder of the invention can be a double-screw extruder or a reciprocating single-screw extruder, and the length-diameter ratio of the screw is not less than 32.
The application of the polypropylene composite material in preparing plastic parts is also within the protection scope of the invention.
In a specific application, the invention specifically protects a plastic part, which is prepared from raw materials comprising the polypropylene composite material.
The polypropylene composite material has good injection molding appearance quality, can well eliminate two appearance defects of rib position marks and stress marks on the surface of a workpiece, can be widely applied to the preparation of plastic workpieces, is particularly suitable for the preparation of plastic workpieces with a large number of reinforcing rib positions with different wall thicknesses on the back and plastic workpieces with larger wall thickness variation, such as automobile door panels, instrument panels, upright posts and the like, and can meet the requirement of high-appearance injection molding.
Compared with the prior art, the invention has the beneficial effects that:
the polypropylene composite material disclosed by the invention takes the high-flow polypropylene material as the main resin, can quickly fill cavities with different wall thicknesses and realize quick cooling shaping, and the high-molecular-weight copolymerized polypropylene with high rubber phase viscosity can play a role in obviously improving the elasticity of a melt, so that the high-molecular-weight ethylene-propylene multiblock copolymer is favorable for realizing good dispersion of an elastomer in two special polypropylene resins, and the obtained polymer melt has outstanding quick cooling shaping capability, and also has outstanding melt flow stability and melt viscoelasticity.
The polypropylene composite material has stable flowing characteristic without jumping flowing when being used for injection molding of a part with uneven wall thickness, can realize stable flowing and quick uniform cooling shaping on the surfaces of dies with different wall thicknesses and different temperatures, is beneficial to controlling the unstable flowing state of polymer melt caused by the change of a pressure field or a temperature field, thereby well eliminating the appearance defects of rib marks and stress marks, and can reach the level 1 standard in rib mark rating and stress mark rating, and is particularly suitable for the use of the part with a large number of reinforcing rib positions with different wall thicknesses on the back and the part with larger wall thickness change.
Detailed Description
The invention will be further described with reference to the following specific embodiments, but the examples are not intended to limit the invention in any way. Raw materials reagents used in the examples of the present invention are conventionally purchased raw materials reagents unless otherwise specified.
(1) Raw material information
Polypropylene:
PP-1 high molecular weight copolymerized polypropylene: PP EP5091 has a weight average molecular weight of 140 ten thousand, a melt mass flow rate of 28g/10min, a test standard ISO1133-1-2011, a test condition of 230 ℃,2.16Kg and a manufacturer: BASELL;
PP-1-a high molecular weight copolymerized polypropylene: PP PDI088, weight average molecular weight 100 ten thousand, melt mass flow rate 100g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: exxon Mobil;
PP-1-B high molecular weight copolymerized polypropylene: PP BX3500, weight average molecular weight 200 ten thousand, melt mass flow rate 10g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: SK;
PP-1-C high molecular weight copolymer polypropylene: PP K9017, weight average molecular weight 120 ten thousand, melt mass flow rate 20g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: performing stage treatment;
PP-1-D high molecular weight copolymerized polypropylene: PP M60RHC, weight average molecular weight 130 ten thousand, melt mass flow rate 60g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: sea-pressing;
PP-2 high flow polypropylene: PP BX3900, melt mass flow rate 50g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: SK;
PP-2-a high flow polypropylene: PP BX3920, melt mass flow rate of 100g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: SK;
PP-2-B high flow polypropylene: PP BX3800, melt mass flow rate of 30g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: SK;
PP-2-C high flow polypropylene: PP BX3950, melt mass flow rate 150g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: SK;
PP-3 non-high molecular weight, non-high flow copolymer polypropylene: PP EP548R, weight average molecular weight 30 ten thousand, melt mass flow rate 28g/10min, test standard ISO1133-1-2011, test condition 230 ℃,2.16Kg, manufacturer: middle sea shell;
the high molecular weight ethylene-propylene multiblock copolymer-1,Hifax X1956A,Mn was 48000, mw/Mz was 14, melt Mass Flow Rate (MFR) was 2.0g/10min, test standard ISO1133-1-2011, test conditions 230 ℃,2.16Kg, manufacturer: BASELL;
high molecular weight ethylene-propylene multiblock copolymer-2,Hifax X1979A,Mn is 20000, mw/Mz is 5, melt Mass Flow Rate (MFR) is 0.5g/10min, test standard ISO1133-1-2011, test conditions 230 ℃,2.16Kg, manufacturer: BASELL;
high molecular weight ethylene-propylene multiblock copolymer-3,Hifax X1986A,Mn is 60000, mw/Mz is 30, melt Mass Flow Rate (MFR) is 10g/10min, test Standard ISO1133-1-2011, test conditions 230 ℃,2.16Kg, manufacturer: BASELL;
ethylene-propylene multiblock copolymers: hifax X1500, mn 10000, mw/Mz 10, melt mass flow rate 6g/10min, test standard ISO1133-1-2011, test conditions 230 ℃,2.16Kg, manufacturer: BASELL;
talcum powder is commercially available, and the parallel examples and comparative examples of the invention are all of the same kind;
an elastomer: ethylene-propylene-octene terpolymers, commercially available, the parallel examples of the invention and the comparative examples are all the same commercial products;
an antioxidant: the mass ratio of the hindered phenol main antioxidant to the phosphite ester auxiliary antioxidant is 1:1, and the hindered phenol main antioxidant and the phosphite ester auxiliary antioxidant are commercially available, and the parallel examples and the comparative examples of the invention are the same commercial products.
(2) Performance detection method
(1) The prepared plastic square plates with reinforcing ribs (with the length, width and thickness of 100mm x3 mm) and plastic square plates with gradual thickness (with the length, width and thickness of 100mm x 2mm gradually changed to 3 mm) are respectively evaluated for rib mark and stress mark effects, preferably 1 grade, and the worst 6 grades, and the average value (rounded) is respectively scored and averaged by 3 professional evaluating persons.
Specific rating criteria are shown in table 1:
| level of | Rib position printing standard | Stress mark criterion |
| Level 1 | No macroscopic bar marks | No macroscopic stress marks |
| Level 2 | Tendon site printing slightly visible to naked eyes | Slight macroscopic stress marks |
| 3 grade | Tendon site stamp visible to naked eyes | Stress marks apparent to naked eyes |
| Grade 4 | Severe tendons and marks, and slight uneven surface | Severe stress marks and slight surface irregularities |
| Grade 5 | The tendon marks are very serious, and the surface is obviously rugged | The stress mark is very serious, and the surface is obviously rugged |
| Grade 6 | The tendon mark is very serious, and the surface has sink marks | The stress mark is very serious, and the surface is provided with a sink mark |
(2) Bending properties: performed in accordance with ISO 178-2010;
(3) cantilever notched impact performance: performed according to ISO 180-2019;
examples 1 to 8
A polypropylene composite material comprises the components shown in the following table 2 in parts by weight.
TABLE 2
The preparation method of the polypropylene composite material comprises the following steps:
the components were uniformly mixed in a mixing apparatus according to the parts by weight of the components in table 2, and then added into a twin screw extruder having an aspect ratio of 40:1, melt-kneaded at a temperature of 200 ℃, and then pelletized, cooled, and dried to obtain a polypropylene composition.
And respectively obtaining a plastic square plate with the size of 200mm by 10mm grid-shaped reinforcing rib positions on the back surface and the size of 200mm by injection molding under the conditions of the injection molding temperature of 200 ℃, the injection molding pressure of 45MPa, the injection molding speed of 45m/s, the pressure maintaining pressure of 30MPa and the pressure maintaining time of 5s, wherein the thickness of the plastic light plate gradually changes from 1mm to 3mm and ISO standard bending and notch impact splines.
Example 9
The polypropylene composite material comprises the same components as in example 5 in parts by weight, except that the polypropylene is a mixture of PP-1-A and PP-2-B, and the weight ratio of PP-1-A to PP-2-B is 1:1.
Example 10
The polypropylene composite material comprises the same components as in example 5 in parts by weight, except that the polypropylene is a mixture of PP-1-B and PP-2-C, and the weight ratio of PP-1-B to PP-2-C is 1:1.
Example 11
The polypropylene composite material comprises the same components as in example 5 in parts by weight, except that the polypropylene is a mixture of PP-1-C and PP-2-C, and the weight ratio of PP-1-C to PP-2-C is 1:1.
Example 12
The polypropylene composite material comprises the same components as in example 5 in parts by weight, except that the polypropylene is a mixture of PP-1-D and PP-2-A, and the weight ratio of PP-1-D to PP-2-A is 1:1.
Example 13
A polypropylene composite comprising the same components in parts by weight as in example 5, except that the high molecular weight ethylene-propylene multiblock copolymer was a high molecular weight ethylene-propylene multiblock copolymer-2.
Example 14
A polypropylene composite comprising the same components in parts by weight as in example 5, except that the high molecular weight ethylene-propylene multiblock copolymer was a high molecular weight ethylene-propylene multiblock copolymer-3.
Comparative examples 1 to 9
A polypropylene composite material comprises the components shown in the following table 3 in parts by weight.
TABLE 3 Table 3
The preparation method of the polypropylene composite material comprises the following steps:
according to the weight parts of the components in the table 3, the components of high molecular weight polypropylene, high flow polypropylene, filler, elastomer, high molecular weight ethylene-propylene multiblock copolymer, processing aid and the like are uniformly mixed in mixing equipment, then added into a double screw extruder with the length-diameter ratio of 40:1, melted and mixed at the temperature of 200 ℃, and then granulated, cooled and dried to obtain the polypropylene composition.
At an injection temperature of 200 ℃, an injection pressure of 45MPa and an injection speed of 45 DEG C S The dwell pressure is 30MPa, dwell time is 5 S The plastic square plate with the size of 200mm by 2mm and the grid-shaped reinforcing rib position with the size of 10mm by 10mm on the back surface and the plastic light plate with the size of 200mm by 200mm and the thickness of which gradually changes from 1mm to 3mm are respectively obtained through injection molding.
Comparative example 10
A polypropylene composite comprising the same components in parts by weight as in example 5, except that the high molecular weight ethylene-propylene multiblock copolymer was replaced with an ethylene-propylene multiblock copolymer, mn was 10000.
The polypropylene composition was prepared in the same manner as in example 2.
At an injection temperature of 200 ℃, an injection pressure of 45MPa, injection speed 45 S The dwell pressure is 30MPa, dwell time is 5 S The plastic square plate with the size of 200mm by 2mm and the grid-shaped reinforcing rib position with the size of 10mm by 10mm on the back surface and the plastic light plate with the size of 200mm by 200mm and the thickness of which gradually changes from 1mm to 3mm are respectively obtained through injection molding.
Result detection
The rib site mark and stress mark effects were evaluated on the reinforcing rib plastic square plate and the graded thickness plastic square plate prepared in the examples and the comparative examples, respectively, and the ISO standard spline flexural modulus and the cantilever beam notch impact strength were tested by a universal mechanical tester and an impact tester, respectively, and the specific evaluation results are shown in table 4 below.
TABLE 4 Table 4
As can be seen from the test results of each example and comparative example, the invention adopts the high molecular weight polypropylene and the high flow polypropylene to compound, the proportion of the high molecular weight polypropylene and the high flow polypropylene is controlled within the range of 1:1-1:3, meanwhile, the high molecular weight ethylene-propylene multiblock copolymer is added to prepare the polypropylene composite material with good appearance and good stress marks (less than or equal to 2 levels) and with the elimination of the tendon mark defect (1 level), if the parameters of each raw material are within the preferred range, the prepared composite material has excellent appearance and effect of completely eliminating the tendon mark defect (1 level) and the stress mark (1 level), and the bending modulus and the notch impact strength performance are relatively balanced, thereby meeting the requirements of the comprehensive mechanical properties of rigid balance. The material is particularly suitable for parts with a large number of reinforcing rib positions with different wall thicknesses on the back and parts with obvious wall thickness changes, and effectively solves the problem of appearance defects in the automobile injection molding industry.
The bending modulus of the polypropylene composite material is 1500-1700 Mpa, and the notch impact strength of the cantilever beam is 15-50 KJ/m 2 Can reach the balance of rigidity and toughnessHas good mechanical property.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The polypropylene composite material is characterized by comprising the following components in parts by weight:
20-120 parts of polypropylene and 5-40 parts of filler; 0-30 parts of an elastomer; 2-10 parts of high molecular weight ethylene-propylene multiblock copolymer;
wherein the polypropylene is a mixture of high molecular weight copolymerized polypropylene and high flow polypropylene, and the high molecular weight copolymerized polypropylene: the weight ratio of the high-flow polypropylene is 1:1-1:3;
wherein the weight average molecular weight of the high molecular weight copolymerized polypropylene is 100-200 ten thousand, the melt mass flow rate is 10-100 g/10min, and the test standard ISO1133-1-2011, 230 ℃ and 2.16Kg load are adopted; the melt mass flow rate of the high-flow polypropylene is 30-150 g/10min, and the test standard ISO
1133-1-2011, 230 ℃ and 2.16Kg load;
the weight average molecular weight Mw of the high molecular weight ethylene-propylene segmented copolymer is 20000-60000, the molecular weight distribution Mw/Mn is 5-30, the melt mass flow rate is 0.5-10 g/10min, the test standard ISO1133-1-2011, 190 ℃ and 2.16Kg load.
2. The polypropylene composite material according to claim 1, comprising the following components in parts by weight:
30-90 parts of polypropylene and 10-20 parts of filler; 5-20 parts of an elastomer; 3-5 parts of high molecular weight ethylene-propylene multi-block copolymer.
3. The polypropylene composite material according to claim 1, wherein the high molecular weight copolymerized polypropylene has a melt mass flow rate of 30 to 60g/10min, test standard ISO1133-1-2011, 230 ℃,2.16Kg load.
4. The polypropylene composite material according to claim 1, wherein the high flow polypropylene has a melt mass flow rate of 50-100 g/10min, test standard ISO1133-1-2011, 230 ℃,2.16Kg load.
5. The polypropylene composite according to claim 1, wherein the high molecular weight ethylene-propylene multiblock copolymer has a weight average molecular weight Mw of 40000 to 50000 and a molecular weight distribution Mw/Mn of 10 to 20.
6. The polypropylene composite according to claim 1, wherein the high molecular weight ethylene-propylene multi-block copolymer has a melt mass flow rate of 1.0 to 3.0g/10min, test standard ISO1133-1-2011, 190 ℃,2.16Kg load.
7. The polypropylene composite of claim 1, wherein the elastomer is one or more of an ethylene-propylene copolymer, an ethylene-octene copolymer, an ethylene-butene copolymer, and an ethylene-propylene-octene terpolymer.
8. A method for preparing the polypropylene composite material according to any one of claims 1 to 7, comprising the steps of:
uniformly mixing polypropylene, filler, elastomer and high molecular weight ethylene-propylene multiblock copolymer, adding into an extruder, melting and mixing at 170-240 ℃, granulating, cooling and drying to obtain the polypropylene composite material.
9. Use of a polypropylene composite according to any one of claims 1 to 7 for the preparation of plastic articles.
10. A plastic part, characterized in that it is produced from a raw material comprising the polypropylene composite according to any one of claims 1 to 7.
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| CN101550252A (en) * | 2009-06-02 | 2009-10-07 | 贵州凯科特材料有限公司 | Polypropylene resin blend and preparing method thereof |
| CN101914243A (en) * | 2010-08-17 | 2010-12-15 | 金发科技股份有限公司 | Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof |
| WO2012034956A1 (en) * | 2010-09-16 | 2012-03-22 | Borealis Ag | High flow and stiff polymer material with good transparency and impact properties |
| CN102391584A (en) * | 2011-10-12 | 2012-03-28 | 中国石油化工股份有限公司 | High-fluidity high-toughness polypropylene resin and preparation method thereof |
| CN103102592A (en) * | 2013-02-04 | 2013-05-15 | 北京海科华昌新材料技术有限公司 | Modified polypropylene material for automotive bumper and preparation method thereof |
| CN110079022A (en) * | 2019-04-25 | 2019-08-02 | 成都金发科技新材料有限公司 | A kind of polypropene composition and preparation method thereof |
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| US6610792B2 (en) * | 2001-07-26 | 2003-08-26 | Fina Technology, Inc. | Polypropylene copolymers and method of preparing polyproylene copolymers |
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| CN101550252A (en) * | 2009-06-02 | 2009-10-07 | 贵州凯科特材料有限公司 | Polypropylene resin blend and preparing method thereof |
| CN101914243A (en) * | 2010-08-17 | 2010-12-15 | 金发科技股份有限公司 | Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof |
| WO2012034956A1 (en) * | 2010-09-16 | 2012-03-22 | Borealis Ag | High flow and stiff polymer material with good transparency and impact properties |
| CN102391584A (en) * | 2011-10-12 | 2012-03-28 | 中国石油化工股份有限公司 | High-fluidity high-toughness polypropylene resin and preparation method thereof |
| CN103102592A (en) * | 2013-02-04 | 2013-05-15 | 北京海科华昌新材料技术有限公司 | Modified polypropylene material for automotive bumper and preparation method thereof |
| CN110079022A (en) * | 2019-04-25 | 2019-08-02 | 成都金发科技新材料有限公司 | A kind of polypropene composition and preparation method thereof |
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