CN104592645A - Low-density low-shrinkage high-impact polypropylene composite material and preparation method thereof - Google Patents
Low-density low-shrinkage high-impact polypropylene composite material and preparation method thereof Download PDFInfo
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- CN104592645A CN104592645A CN201410829067.6A CN201410829067A CN104592645A CN 104592645 A CN104592645 A CN 104592645A CN 201410829067 A CN201410829067 A CN 201410829067A CN 104592645 A CN104592645 A CN 104592645A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 44
- -1 polypropylene Polymers 0.000 title claims abstract description 44
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 44
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 229920001971 elastomer Polymers 0.000 claims abstract description 21
- 239000000806 elastomer Substances 0.000 claims abstract description 20
- 239000011256 inorganic filler Substances 0.000 claims abstract description 18
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000012745 toughening agent Substances 0.000 claims abstract description 8
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 239000000654 additive Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 13
- 239000003963 antioxidant agent Substances 0.000 claims description 12
- 230000003078 antioxidant effect Effects 0.000 claims description 12
- 238000007580 dry-mixing Methods 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 8
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 8
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 229920002943 EPDM rubber Polymers 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000000845 anti-microbial effect Effects 0.000 claims description 2
- 239000003086 colorant Substances 0.000 claims description 2
- 239000007822 coupling agent Substances 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 239000004611 light stabiliser Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 239000002667 nucleating agent Substances 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical group OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 150000007970 thio esters Chemical class 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 238000001746 injection moulding Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 9
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 8
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000011056 performance test Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000003562 lightweight material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- VKJLYEDTHCTCOH-UHFFFAOYSA-N 3-(3-octadecoxy-3-oxopropyl)sulfanylpropanoic acid Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(O)=O VKJLYEDTHCTCOH-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- 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 invention discloses a low-density low-shrinkage high-impact polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises the following raw materials in percentage by weight: 69%-85% of polypropylene, 5%-15% of high-property inorganic fillers, 10%-20% of elastomer toughening agents, 0.1%-2% of stabilizers and 0%-5% of other additives. The low-density low-shrinkage high-impact polypropylene composite material and the preparation method thereof have the advantages that 1, the polypropylene composite material with lower density and preferable toughness is obtained through the synergistic effect of the high-property inorganic fillers, the elastomer toughening agents and co-polypropylene; 2, in addition, the low-density high-impact polypropylene composite material with preferable comprehensive property is obtained through a process method in which the high-property inorganic fillers are added from a side feed opening.
Description
Technical Field
The invention relates to a polypropylene composite material, in particular to a polypropylene composite material with low density, low shrinkage and high impact resistance and a preparation method thereof; belongs to the field of polymer modification and processing.
Background
With the increasing energy problem, in recent years, various automobile main engine plants are trying to reduce the overall weight of the automobile. For the raw materials of plastic parts, the density of the polypropylene raw material occupying a larger proportion is reduced, and the weight of a finished piece can be effectively reduced, so that the light weight of the whole automobile is contributed. In recent decades, the research aiming at light weight and related achievements have been endless, and many automobile factories or raw material manufacturers have conducted more intensive research on low-density materials, and have made certain progress in the field of low-density and light-weight materials through special processes such as high-performance ultrafine or nano-grade mineral filling and microcellular foaming, and fiber filling modification.
However, for injection molding manufacturers of automobile parts, especially large parts such as instrument panels, door panels, bumpers, and the like, low-density lightweight materials have a significant effect on reducing the weight of the whole automobile, but have higher requirements on the design and manufacture of injection molds. This is because the low density material mostly comes at the expense of partially sacrificing rigidity or toughness, and for structural or functional parts, more supporting or reinforcing structures must be added to the mold design to meet the use requirements of the low density material with lower rigidity or toughness. A more serious problem is that since the polypropylene material has a larger shrinkage rate, the lower density and lower filling will cause more serious shrinkage, which requires that a larger mold shrinkage rate than that of the normal material is used in the mold design, which means that if the whole vehicle is lightened, the mold for manufacturing all large plastic parts must be redesigned, which is obviously impractical for the main engine plant and the part plant. Therefore, lightweight materials have been used in automobiles for a few years in volume.
In order to solve the problems, the invention obtains the polypropylene composite material with low density, low shrinkage and high impact resistance by researching the synergistic action of the high-performance inorganic mineral, the copolymerized propylene and the rubber elastomer and using a side feeding processing technology, the product has the same shrinkage rate as a normal material except that the density is reduced, the rigidity is not basically lost and the toughness is improved, and the polypropylene composite material can be conveniently and directly applied to the injection molding of main automobile interior and exterior trim parts, thereby achieving the effect of reducing the weight of the whole automobile.
Disclosure of Invention
The invention aims to develop a low-density, low-shrinkage and high-impact polypropylene composite material for common injection molding parts in the automobile or household appliance industry.
Another object of the present invention is to provide a method for preparing such a polypropylene composite. The purpose of the invention can be realized by the following technical scheme:
a low-density, low-shrinkage and high-impact polypropylene composite material comprises the following raw materials in percentage by weight:
wherein,
the polypropylene is copolymerized propylene with the melt flow rate of 3-70g/10min under the test condition of 230 ℃ multiplied by 2.16kg, wherein the comonomer of the copolymerized propylene is ethylene, and the content of the comonomer is 4-10 mol%.
The high-performance inorganic filler is one or a composition of more than two of talcum powder and mica, and the talcum powder with the average grain diameter of 0.5-2.5 mu m is preferred.
The elastomer toughening agent is one or a composition of more than two of polybutadiene rubber, ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer, ethylene-butene copolymer and the like, preferably ethylene-butene copolymer elastomer, and has a melt flow rate of 0.5-10g/10min under the test condition of 230 ℃ multiplied by 2.16 kg.
The stabilizer is a primary antioxidant and a secondary antioxidant which are considered to be needed by a person skilled in the art, wherein the primary antioxidant is a hindered phenol or thioester antioxidant, and the secondary antioxidant is a phosphite or ester antioxidant.
The other additives include one or a combination of two or more of colorants, nucleating agents, blowing agents, surfactants, plasticizers, coupling agents, flame retardants, light stabilizers, processing aids, antistatic aids, antimicrobial aids, and lubricants as deemed necessary by one skilled in the art.
The preparation method of the low-density, low-shrinkage and high-impact polypropylene composite material comprises the following steps:
1) weighing the raw materials according to the weight ratio;
2) putting the raw materials in the step 1) into a high-speed mixer for dry mixing for 3-15 minutes, adding the mixed raw materials into a double-screw extruder, and cooling and granulating after melt extrusion; wherein the temperature in the screw cylinder is as follows: the first zone is 190-.
Another preferred preparation method is: weighing the raw materials according to the weight ratio; dry-mixing polypropylene, an elastomer toughening agent, a stabilizer and other auxiliaries in a high-speed mixer for 3-15 minutes to prepare a mixture A, adding the mixture A into a double-screw extruder from a main feeding port at the tail part of a screw, adding a high-performance inorganic filler into the double-screw extruder from a side feeding port in the middle part of the screw, and cooling and granulating after melt extrusion; wherein the temperature in the screw cylinder is as follows: the first zone is 190-.
The invention has the advantages that:
1. the polypropylene composite material with lower density and better toughness is obtained through the synergistic effect of the high-performance inorganic filler, the elastomer toughening agent and the propylene copolymer.
2. The low-density high-impact polypropylene composite material with better comprehensive performance is obtained by a process method of adding the high-performance inorganic filler from a side feeding port.
3. Through the synergistic effect of the components and the side feeding production process, the obtained low-density and high-impact polypropylene material has low shrinkage rate and mechanical property equivalent to those of a normal material, can reduce the weight of the material on the premise of not adjusting the shrinkage rate and the structure of a plastic part die, and provides an easily-realized lightweight approach for the plastic part.
Detailed Description
The present invention will be described in further detail with reference to examples. The scope of the invention is not limited by these examples, which are set forth in the following claims.
In the composite formulations of the examples and comparative examples, the polypropylene used was a block copolymer propylene having a melt flow rate (230 ℃ C. times.2.16 kg) of 20 to 50/10min, wherein the comonomer of the block copolymer propylene was ethylene and the content thereof was in the range of 4 to 10 mol%.
The high-performance inorganic filler is superfine talcum powder with the average grain diameter of 0.5-2.5 mu m.
The elastomer used was ethylene-butene copolymer 7487 from DOW.
The stabilizers used were Negonox DSTP (chemical name stearyl thiodipropionate) from ICE, British, Irganox1010 (chemical name pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]) from BASF, and Igrafos168 (chemical name tris (2, 4-di-tert-butylphenyl) phosphite) from BASF.
Example 1
Weighing 84.5 percent of polypropylene, 5 percent of high-performance inorganic filler, 10 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Example 2
Weighing 79.5 percent of polypropylene, 10 percent of high-performance inorganic filler, 10 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Example 3
Weighing 74.5 percent of polypropylene, 10 percent of high-performance inorganic filler, 15 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Example 4
Weighing 69.5 percent of polypropylene, 10 percent of high-performance inorganic filler, 20 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Example 5
Weighing 74.5 percent of polypropylene, 15 percent of high-performance inorganic filler, 10 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Example 6
Weighing 74.5 percent of polypropylene, 15 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, and dry-mixing for 5 minutes in a high-speed mixer to prepare a mixture A; respectively adding the mixture A into a double-screw extruder from a main feeding port at the tail part of the screw and 10 percent of high-performance inorganic filler from a lateral feeding port in the middle part of the screw for melt extrusion granulation; wherein the temperature in the screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Comparative example
Weighing 69.5 percent of polypropylene, 20 percent of high-performance inorganic filler, 10 percent of elastomer, 0.1 percent of Irganox1010, 0.1 percent of Igrafos168 and 0.3 percent of Negonox DSTP according to weight percentage, dry mixing for 5 minutes in a high-speed mixer, adding into a double-screw extruder, melting, extruding and granulating, wherein the temperature in a screw cylinder is as follows: the first zone is 200 ℃, the second zone is 210 ℃, the third zone is 210 ℃, the fourth zone is 210 ℃, the head is 220 ℃, and the rotating speed of the double-screw extruder is 400 r/min. Drying the particles, and performing injection molding on an injection molding machine to prepare a sample.
Performance evaluation method:
the sample density test is carried out according to the ISO1183-1 standard; the bending performance test is carried out according to ISO178 standard, the size of a test sample is 80 multiplied by 10 multiplied by 4mm, the span is 64mm, and the bending speed is 2 mm/min; the impact performance test of the simply supported beam is carried out according to the ISO179-1 standard, the size of a sample is 80 multiplied by 10 multiplied by 4mm, and the depth of a notch is one third of the thickness of the sample; the material shrinkage test was performed on a smooth flat plate having a size of 150 × 100 × 3mm, placed under constant temperature and humidity conditions for 48 hours after injection molding, the length of the sample plate in the flow direction (150mm side) was measured, and the shrinkage was calculated from the change in size.
The formulations and performance test results for the examples and comparative examples are shown in the following tables:
TABLE 1 EXAMPLES 1-6 AND COMPARATIVE EXAMPLE MATERIALS FORMULATION (% by weight)
Table 2 examples 1-6 and comparative examples performance test results
As can be seen from the comparison of examples 1, 2 and 5 with the comparative example, the rigidity of the material gradually increases with the increase of the content of the superfine talcum powder, the toughness slightly decreases, and the shrinkage rate basically linearly decreases. The comparison of examples 2-4 shows that the rigidity of the material is obviously reduced, the toughness is obviously improved and the shrinkage rate is in a linear reduction trend along with the increase of the content of the elastomer. Comparing examples 5 and 6, it can be seen that the process of adding inorganic powder by side feeding can obtain material with better comprehensive performance, and the shrinkage rate is also slightly reduced. As can be seen from comparison of all examples with comparative examples, the rigidity of examples 1 and 4 is too poor, the shrinkage rate of example 2 is larger, the weight reduction ratio of example 5 is not obvious, the performance of example 3 is closer to that of the comparative example, but the rigidity and the shrinkage rate are different to a certain extent, the material performance of example 6 is closest to that of the comparative example, the toughness is also obviously improved, the weight of the material can be reduced by 7.5% on the premise of not changing the shrinkage rate, and the overall evaluation is optimal.
Claims (10)
1. A low-density, low-shrinkage and high-impact polypropylene composite material is characterized in that: the material consists of the following raw materials in percentage by weight:
2. the low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the polypropylene is copolymerized propylene with the melt flow rate of 3-70g/10min under the test condition of 230 ℃ multiplied by 2.16kg, wherein the comonomer of the copolymerized propylene is ethylene, and the content of the comonomer is 4-10 mol%.
3. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the high-performance inorganic filler is one or a composition of more than two of talcum powder and mica.
4. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the high-performance inorganic filler is talcum powder with the average grain diameter of 0.5-2.5 mu m.
5. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the elastomer toughening agent is one or a composition of more than two of polybutadiene rubber, ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer and ethylene-butene copolymer.
6. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the elastomer toughening agent is an ethylene-butylene copolymer elastomer, and the melt flow rate is 0.5-10g/10min under the test condition of 230 ℃ multiplied by 2.16 kg.
7. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the stabilizer is a primary antioxidant and a secondary antioxidant which are considered to be needed by a person skilled in the art, wherein the primary antioxidant is a hindered phenol or thioester antioxidant, and the secondary antioxidant is a phosphite or ester antioxidant.
8. The low density, low shrinkage, high impact polypropylene composite of claim 1, wherein: the other additives include one or a combination of two or more of colorants, nucleating agents, blowing agents, surfactants, plasticizers, coupling agents, flame retardants, light stabilizers, processing aids, antistatic aids, antimicrobial aids, and lubricants as deemed necessary by one skilled in the art.
9. The method of making a low density, low shrinkage, high impact polypropylene composite according to any one of claims 1 to 8 wherein: the method comprises the following steps:
1) weighing the raw materials according to the weight ratio;
2) putting the raw materials in the step 1) into a high-speed mixer for dry mixing for 3-15 minutes, adding the mixed raw materials into a double-screw extruder, and cooling and granulating after melt extrusion; wherein the temperature in the screw cylinder is as follows: the first zone is 190-.
10. The method of making a low density, low shrinkage, high impact polypropylene composite according to any one of claims 1 to 8 wherein:
1) weighing the raw materials according to the weight ratio;
2) dry-mixing polypropylene, an elastomer toughening agent, a stabilizer and other auxiliaries in a high-speed mixer for 3-15 minutes to prepare a mixture A, adding the mixture A into a double-screw extruder from a main feeding port at the tail part of a screw, adding a high-performance inorganic filler into the double-screw extruder from a side feeding port in the middle part of the screw, and cooling and granulating after melt extrusion; wherein the temperature in the screw cylinder is as follows: the first zone is 190-.
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Application publication date: 20150506 |