CN103102592A - Modified polypropylene material for automotive bumper and preparation method thereof - Google Patents
Modified polypropylene material for automotive bumper and preparation method thereof Download PDFInfo
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- CN103102592A CN103102592A CN2013100439283A CN201310043928A CN103102592A CN 103102592 A CN103102592 A CN 103102592A CN 2013100439283 A CN2013100439283 A CN 2013100439283A CN 201310043928 A CN201310043928 A CN 201310043928A CN 103102592 A CN103102592 A CN 103102592A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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Abstract
The invention relates to a modified polypropylene material for an automotive bumper and a preparation method thereof. The modified polypropylene material comprises polypropylene, a toughening agent, a compatilizer, inorganic filler and toner. The modified polypropylene material is characterized by further comprising a dispersing agent, wherein the components in parts by weight are as follows: 30-60 parts of polypropylene, 10-30 parts of toughening agent, 3-8 parts of compatilizer, 25-40 parts of inorganic filler, 0.1-2.6 parts of toner and 0.3-2.1 parts of dispersing agent. The modified polypropylene material has the characteristics that the liquidity is good, the impact resistance and filling performance are high, the machining is easy, the molding cycle is short and shooting process requirements on large-scaled thin-wall workpieces can be met; and an automotive bumper product produced by the material provided by the invention is good in dimensional stability and is capable of meeting requirements on the dimensional stability of the workpieces at different temperatures and seasons.
Description
Technical field:
The present invention relates to a kind of polypropylene composite material, relate in particular to a kind of modified polypropylene material that is used for bumper that comprises polypropylene, toughner, compatilizer, mineral filler, toner.
The invention still further relates to a kind of polypropylene composite material preparation method, relate in particular to a kind of modified polypropylene material preparation method for bumper.
Background technology:
Along with the rapid raising of auto output and social recoverable amount, energy-saving and environmental protection, low cost become the major objective of current automobile industry development.The manufacturing that is used for automobile component with light weight plastics alternative metals is the important means that automotive industry realizes above target.Collision bumper is one of exterior trimming parts maximum on automobile, as one independently assembly be arranged on automobile, the safety precaution of vehicle, modeling effect, air pertormance etc. are had larger impact.Therefore, attach great importance to the research of bumper and bumper material both at home and abroad.
The improving constantly the requirement of the aspects such as automobile appearance, safety, function along with Trend of Auto Manufacturing Technologies level and human consumer, and from the angle of automobile forming, installation and use, collision bumper is higher to the performance requriements of material, this just requires the performance of bumper material that corresponding lifting will be arranged, major requirement has: high workability, satisfy the forming requirements of long flow path, wall is thin, structure is more complicated collision bumper; Low thermal expansivity and good dimensional stability, with the requirement that adapts to zero slit design and in wider ambient temperature range indeformable, the warpage not of goods; High shock resistance, especially low-temperature impact resistance keep good toughness and rigid balancing simultaneously; So that collision bumper is under the prerequisite that satisfies the working strength requirement, wall is thinner, and quality is lighter, cost is lower.
Inexpensive, the easy recovery of polypropylene (PP) light weight, modification technology are ripe, are one of consumption kinds maximum, with the fastest developing speed in auto plastics.In recent years, along with the progress of PP compounding technology and plastic molding processing technology, use the collision bumper of the material modified production of PP to account for 70%.The MODIFIED PP collision bumper has that cost is low, quality is light, the advantage such as use again capable of circulation, and consumption increases just gradually, and is just replacing other various types of collision bumpers.
Chinese invention patent application prospectus CN101693777A discloses a kind of material for vehicle bumper and preparation method thereof, composition proportion is: polypropylene: 49～69%, unsaturated ethylene-octene copolymer: 5～25%, calcium sulfate crystal whiskers: 10～30%, polypropylene grafted maleic anhydride multipolymer: 5～15%, nucleator: 0.1～0.2%, oxidation inhibitor: 0.3～0.6%, lubricant: 0.2～0.5%.Its technique: first according to proportioning, the material except the sulfuric acid calcium pyroborate is mixed in mixing machine, calcium sulfate crystal whiskers adds from the side direction spout, and mixture is mixing in twin screw extruder, extrude, cooling, pelletizing.By to polypropylene modification, improve its intensity and toughness, reduce polyacrylic molding shrinkage, the modified polypropylene material of preparation is applied to bumper.
Chinese invention patent application prospectus CN102382375A discloses a kind of polypropylene dedicated material for bumper or inside gadget, formed by following mass parts component: polypropylene: 90.5～99.5 parts, nano-rubber: 0.5～5 part, antioxidant 1010: 0.1～2 part, auxiliary antioxidant 168:0.1～2 part, halogen scavenging agent: 0.01～1 part, superoxide: 0.01～5 part, and the polypropylene dedicated material that forcing machine is extruded after mixing, described polypropylene is Co-polypropylene and/or block polypropylene, wherein total ethylene content is 12～14wt%, number-average molecular weight is 30000～40000.Polypropylene dedicated material for bumper or inside gadget of the present invention, its melt flow rate (MFR) is 14-17g/10min, stretching yield stress is 21MPa, modulus in flexure is 969-1040MPa, Rockwell hardness is 81-84, the load deformation temperature is 82-87 ℃, simple beam impact strength: 23 ℃ is 50-54kJ/m2, and-20 ℃ is 4.7-6.0kJ/m2.Be suitable for making bumper or inside gadget.
Chinese invention patent application prospectus CN102516639A discloses a kind of high rigidity, low-density modified polypropylene composite material and preparation method thereof.Modified polypropylene composite material of the present invention is mixed by the hollow glass microballoon of 40～90wt% polypropylene, 0～30wt% toughner, 1～20wt%, the nano-calcium carbonate of 1～10wt%, the talcum powder of 1～15wt%, the oxidation inhibitor of 0.3～0.5wt%, the Masterbatch of 1wt%, the compatilizer of 0.5～3wt%.The present invention mixes nano-calcium carbonate and is filled to polypropylene material with double glazing, to improve the rigidity of modified polypropylene composite material, reduced simultaneously the density of modified polypropylene composite material, be fit to be applied to make the parts such as fascia, door shield, collision bumper, column guard board, to mould Dai Gang, energy-saving and emission-reduction etc., important effect arranged for automotive material.
Summary of the invention:
The object of the invention is to provide a kind of new modified polypropylene material that is used for bumper, has height and melts finger, high impact-resistant, high characteristics of filling, and under the condition of the performance that satisfies the bumper requirement, has reduced cost.
Another purpose of the present invention is the preparation method that the above-mentioned modified polypropylene material that is used for bumper newly also is provided.
A kind of modified polypropylene material for bumper of the present invention, by the following technical solutions: comprise polypropylene, toughner, compatilizer, mineral filler, toner, it is characterized in that: it also comprises dispersion agent, and the weight part of each component is as follows: polypropylene: 30～60; Toughner: 10～20; Compatilizer: 3～8; Mineral filler: 25～40; Toner: 0.1～2.6; Dispersion agent: 0.3～2.1.
Wherein said polypropylene, what select is high-impact, high flowing, high-intensity polypropylene.
A kind of improvement as technique scheme, wherein, described toughner is selected from a kind of, two or more the mixture in ethylene-octene copolymer (POE), ethylene-propylene rubber(EPR), styrene-butadiene rubber(SBR), ethylene-acrylate copolymer, ethene-alpha-olefin copolymer, styrene-butadiene-styrene.Acting as of toughner: the fragility after the reduction plastic hardening, improve its shock strength and elongation.
As a kind of improvement of technique scheme, wherein, described compatilizer is selected from a kind of, two or more the mixture in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, methyl-methacrylate grafted polypropylene.Acting as of compatilizer: reduce interfacial tension, the consistency when improving polymer blending.
A kind of improvement as technique scheme, wherein, described mineral filler is selected from talcum powder, wollastonite, glass, calcium carbonate, calcium carbonate crystal whisker, barium sulfate, barium sulfate crystal whisker, glass microballon, mica powder, magnesium hydroxide a kind of, two or more mixture wherein.Acting as of mineral filler: improve mechanical property and the impelling strength of material, reduce molding shrinkage and the dimensional stability thereof of material.
As a kind of improvement of technique scheme, wherein, described dispersion agent is selected from ethylene bis stearamide, stearate, mineral oil, polyethylene wax, oxidic polyethylene, stearic acid, amine hydroxybenzene a kind of, two or more mixture wherein.Acting as of dispersion agent: reduce in the course of processing between plastic material and processor and and the plastic material interior molecules between the phase mutual friction, thereby improve the processing characteristics of plastics, and improve the performance of goods.
A kind of improvement as technique scheme, wherein, it also comprises oxidation inhibitor, is selected from Hinered phenols antioxidant, phosphite ester kind antioxidant, a kind of, two or more mixture in monothioester kind antioxidant or composite antioxidant, its weight part is 0～1.2.Acting as of oxidation inhibitor: prevent the thermooxidative degradation in polymer processing, delay or suppress the carrying out of polymkeric substance oxidising process, thereby stop the aging of polymkeric substance and extend its work-ing life.
A kind of improvement as technique scheme, wherein, it also comprises the steady agent of light, is selected from the steady agent of hindered amines light, the steady agent of azimidobenzene class light, the steady agent of benzophenone light or composite antioxidant a kind of, two or more mixture wherein, and its weight part is 0～1.2.Acting as of the steady agent of light: prevent or delay macromolecular material generation photoaging effect.
The method of the modified polypropylene material that is used for bumper that preparation of the present invention is above-mentioned comprises the following steps:
Step 1: each component is mixed in mixing machine;
Step 2: the mixture that obtains in step 1 is added in twin screw extruder mixing, 190-240 ℃ of twin screw extruder temperature, screw speed 400-490rpm, main frame electric current 145-190A, feeding rotating speed 60-100Hz, head pressure 1-5Mpa;
Step 3: the material that obtains is extruded by the normal temperature water quench, forced air drying, pelletizing namely obtains material for vehicle bumper.
The present invention compared with prior art, adopted the new modified polypropylene material that is used for bumper, have good fluidity, high impact-resistant, high characteristics of filling, be easy to processing, shaping cycle is short, can satisfy the Shooting Technique requirement of large-scale thin wall parts, the bumper product size good stability that uses material of the present invention to make can satisfy product in the requirement of differing temps, Various Seasonal dimensional stability.
Specific embodiment:
A kind of modified polypropylene material for bumper of the present invention comprises polypropylene, dibutyl phthalate, compatilizer, mineral filler, toner, oxidation inhibitor, the steady agent of light, and the weight part of each component is as follows: polypropylene: 30～60; Toughner: 10～20; Compatilizer: 3～8; Mineral filler: 25～40; Toner: 0.1～2.6; Dispersion agent: 0.3～2.1; Oxidation inhibitor 0～1.2; The steady agent of light: 0～1.2.
Prepare the method for the above-mentioned modified polypropylene material that is used for bumper, comprise the following steps: a kind of modified polypropylene material for bumper, by the following technical solutions: at first, each component is mixed in mixing machine; Then, the mixture that is mixed to get is added in twin screw extruder mixing, 190-240 ℃ of twin screw extruder temperature, screw speed 400-490rpm, main frame electric current 145-190A, feeding rotating speed 60-100Hz, head pressure 1-5Mpa; At last, the material that obtains is extruded by the normal temperature water quench, forced air drying, pelletizing namely obtains material for vehicle bumper.
Embodiment 1: 56 parts of polypropylene, POE10 part, 5 parts of maleic anhydride inoculated polypropylenes, 25 parts of talcum powder, 2 parts of toners, 1.5 parts of calcium stearates, 0.3 part of composite antioxidant, 0.3 part of hindered amines light stabilizer, 0.1 part of the steady agent of benzophenone light, mix in high-speed mixer, through the twin screw extruder melt blending, extrude granulation, obtain the modified polypropene product, physicals sees Table 1
Embodiment 2: 48 parts of polypropylene, POE12 part, 6 parts of acrylic acid-grafted polypropylenes, 30 parts of talcum powder, 2 parts of toners, 1.2 parts of ethylene bis stearamides, 0.5 part of calcium stearate, 0.2 part of hindered phenol antioxygen, 0.1 part of phosphite antioxidant, hindered amines light stabilizer 0.3 mixes in high-speed mixer, through the twin screw extruder melt blending, extrude, granulation obtains the modified polypropene product, and physicals sees Table 1
Embodiment 3: 39 parts of polypropylene, POE15 part, 7 parts of maleic anhydride inoculated polypropylenes, 20 parts of talcum powder, 15 parts of glass microballons, 2 parts of toners, 1.3 parts of ethylene bis stearamides, 0.6 part of polyethylene wax, 0.4 part of composite antioxidant, 0.2 part of the steady agent of complex light mixes in high-speed mixer, through the twin screw extruder melt blending, extrude, granulation obtains the modified polypropene product, and physicals sees Table 1
Embodiment 4: 30 parts of polypropylene, POE20 part, 8 parts of maleic anhydride inoculated polypropylenes, 25 parts of talcum powder, 15 parts, calcium carbonate, 2 parts of toners, 1.5 parts of ethylene bis stearamides, 0.6 part of polyethylene wax, 0.6 part of composite antioxidant, 0.4 part of the steady agent of azimidobenzene class light mixes in high-speed mixer, through the twin screw extruder melt blending, extrude, granulation obtains the modified polypropene product, and physicals sees Table 1
Embodiment 5: 65 parts of polypropylene, 16 parts, styrene-butadiene rubber(SBR), 3 parts of methyl-methacrylate grafted polypropylenes, 35 parts of mica powders, 0.6 part of toner, 1.5 parts of oxidic polyethylenes, 0.2 part of hindered phenol antioxygen, 0.2 part of phosphite antioxidant, 0.3 part of the steady agent of azimidobenzene class light, mix in high-speed mixer, through the twin screw extruder melt blending, extrude granulation, obtain the modified polypropene product, physicals sees Table 1.
Embodiment 6: 60 parts of polypropylene, 11 parts of ethene-alpha-olefin copolymers, 3 parts of acrylic acid-grafted polypropylenes, 3 parts of maleic anhydride inoculated polypropylenes, 35 parts of barium sulfate crystal whiskers, 1.6 parts of toners, 0.8 part of amine hydroxybenzene, 0.4 part of hindered phenol antioxygen, 0.2 part, monothioester oxidation inhibitor, 0.4 part of the steady agent of azimidobenzene class light mixes in high-speed mixer, through the twin screw extruder melt blending, extrude, granulation obtains the modified polypropene product, and physicals sees Table 1.
Embodiment 7: 46 parts of polypropylene, 19 parts of ethylene-acrylate copolymers, 3 parts of acrylic acid-grafted polypropylenes, 6 parts of methyl-methacrylate grafted polypropylenes, 25 parts of barium sulfate crystal whiskers, glass 15,1.0 parts of toners, 1.1 parts of amine hydroxybenzenes, polyethylene wax 0.6,0.4 part of hindered phenol antioxygen, 0.2 part, monothioester oxidation inhibitor, 0.1 part of phosphite antioxidant, 0.8 part of the steady agent of complex light, mix in high-speed mixer, through the twin screw extruder melt blending, extrude granulation, obtain the modified polypropene product, physicals sees Table 1.
Embodiment 8: 44 parts of polypropylene, 5 parts of styrene-butadiene-styrenes, 5 parts of acrylic acid-grafted polypropylenes, 4 parts of methyl-methacrylate grafted polypropylenes, 30 parts of glass microballons, 0.8 part of toner, 0.6 part, mineral oil, polyethylene wax 0.9,0.3 part of hindered phenol antioxygen, 0.3 part, monothioester oxidation inhibitor, 0.4 part of the steady agent of benzophenone light mixes in high-speed mixer, through the twin screw extruder melt blending, extrude granulation, obtain the modified polypropene product, physicals sees Table 1.
Table 1 modified polypropylene material physicals
Claims (8)
1. a modified polypropylene material that is used for bumper, comprise polypropylene, toughner, compatilizer, mineral filler, toner, and it is characterized in that: it also comprises dispersion agent, and the weight part of each component is as follows:
Polypropylene: 30～60; Toughner: 10～20; Compatilizer: 3～8; Mineral filler: 25～40; Toner: 0.1～2.6; Dispersion agent: 0.3～2.1.
2. a kind of modified polypropylene material for bumper according to claim 1, it is characterized in that: described toughner is selected from a kind of, two or more the mixture in ethylene-octene copolymer, ethylene-propylene rubber(EPR), styrene-butadiene rubber(SBR), ethylene-acrylate copolymer, ethene-alpha-olefin copolymer, styrene-butadiene-styrene.
3. a kind of modified polypropylene material for bumper according to claim 1, it is characterized in that: described compatilizer is selected from a kind of, two or more the mixture in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, methyl-methacrylate grafted polypropylene, styrene-grafted polypropylene.
4. a kind of modified polypropylene material for bumper according to claim 1, it is characterized in that: described mineral filler is selected from talcum powder, wollastonite, glass, calcium carbonate, calcium carbonate crystal whisker, barium sulfate, barium sulfate crystal whisker, glass microballon, mica powder, magnesium hydroxide a kind of, two or more mixture wherein.
5. a kind of modified polypropylene material for bumper according to claim 1, it is characterized in that: described dispersion agent is selected from ethylene bis stearamide, stearate, mineral oil, polyethylene wax, oxidic polyethylene, stearic acid, amine hydroxybenzene a kind of, two or more mixture wherein.
6. a kind of modified polypropylene material for bumper according to claim 1, it is characterized in that: it also comprises oxidation inhibitor, be selected from a kind of, two or more mixture in Hinered phenols antioxidant, phosphite ester kind antioxidant, monothioester kind antioxidant or composite antioxidant, its weight part is 0～1.2.
7. the described a kind of modified polypropylene material for bumper of any one according to claim 1 to 6, it is characterized in that: it also comprises the steady agent of light, be selected from the steady agent of hindered amines light, the steady agent of azimidobenzene class light, the steady agent of benzophenone light or the steady agent of complex light a kind of, two or more mixture wherein, its weight part is 0～1.2.
8. method for preparing the described modified polypropylene material for bumper of any one in claim 1 to 7 comprises the following steps:
Step 1: each component is mixed in mixing machine;
Step 2: the mixture that obtains in step 1 is added in twin screw extruder mixing, 190-240 ℃ of twin screw extruder temperature, screw speed 400-490rpm, main frame electric current 145-190A, feeding rotating speed 60-100Hz, head pressure 1-5Mpa;
Step 3: the material that obtains is extruded rear cooling, pelletizing namely obtains material for vehicle bumper.
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