CN106700265A - Special low-aftershrinkage polypropylene (PP) composite material for automobile bumper bar and preparation method for PP composite material - Google Patents
Special low-aftershrinkage polypropylene (PP) composite material for automobile bumper bar and preparation method for PP composite material 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- 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
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a special low-aftershrinkage polypropylene (PP) composite material for an automobile bumper bar. The PP composite material is prepared from the following ingredients in parts by weight: 100 parts of PP, 15-30 parts of natural rubber, 15-45 parts of talcum, 10-35 parts of high-mesh talcum powder, 25-45 parts of toughener, 0.25-0.5 part of nucleating agent, 0.4-0.8 part of lubricant, 0.2-0.3 part of couplant and 0.15-0.4 part of antioxidant. Through adding the talcum, carrying out main and side feeding simultaneously and using the high-mesh talcum powder and the natural rubber in a compounded manner, the PP composite material with excellent comprehensive performance is obtained, and meanwhile, the shrinking percentage of the PP composite material is lowered greatly. According to the PP composite material, by adding the special talcum, when the composite material is processed, the melt mixing is uniform, the problems such as machine head blockage and bar drawing breakage do not occur, and the shrinking percentage and other mechanical properties of the prepared composite material are optimal. According to the PP composite material, the process is simple, and large-batch production is easy to carry out.
Description
Technical field：
The present invention relates to polymer modification field, more particularly to a kind of special low after-contraction PP composite material of car insurance bar and preparation method thereof.
Background technology：
Polypropylene（PP）Due to cheap, it is easy to machine-shaping and its low with density, the advantages of resistant to chemical etching and physical and mechanical property that itself is excellent, its application widely, as one of general plastic with fastest developing speed., it is necessary to dimensional stability higher for bumper, i.e., should also keep less after-contraction after the aftertreatment technology such as the contraction that is molded material after 24h ~ 48h is small and material is sprayed, coated.It is the material of PP+EPDM-TD15 ~ TD30 that current most of automobile main frame maker use polypropylene modified material, and the shrinkage factor of material is 0.8 ~ 1.3% after such material injection 24h ~ 48h, and it is 1.0 ~ 1.5% to carry out the shrinkage factor after spraying 24h ~ 48h（Note：Spraying conditions are 85 DEG C, 40min）.The method of reduction polypropylene material shrinkage factor conventional at present is such as：1st, the amount of addition filler or increase filler, such as talcum powder, calcium carbonate, mica；2nd, glass fibre is added；3rd, the content of toughener is increased.The shortcoming of above-mentioned three kinds of methods is respectively：1st, the amount of addition filler or increase filler --- the decline of toughness certainly will be brought；2nd, glass fibre is added --- the injection problems such as floating fibre, warpage certainly will be brought；3rd, the content of toughener is increased --- raising, the reduction of modulus of cost certainly will be brought.
The present invention has prepared that comprehensive mechanical property is excellent, low after-contraction PP composite material using natural rubber, talcum, toughener, the mode of nucleator compounding use.
The content of the invention：
It is an object of the invention to provide special low after-contraction PP composite material of a kind of car insurance bar and preparation method thereof.
The special low after-contraction PP composite material of this car insurance bar of the invention, it is made up of the component of following weight portion：
Polypropylene
100 parts,
Natural rubber
15 ~ 30 parts,
Talcum
15 ~ 45 parts,
High mesh number talcum powder
10 ~ 35 parts,
Toughener
25 ~ 45 parts,
Nucleator
0.25 ~ 0.5 part,
Lubricant
0.4 ~ 0.8 part,
Coupling agent
0.2 ~ 0.3 part,
Antioxidant
0.15 ~ 0.4 part.
Above-mentioned polypropylene（PP）It is COPP, preferably two kinds or more COPP compounding uses.
Above-mentioned toughener is ethylene-octene copolymer（POE）, MBS terpolymer（MBS）, SIS/SEBS（SEBS）Three's compounding use.
The feeding manner of above-mentioned talcum is carried out simultaneously by main feeding and side feeding, and mass ratio is the charging of main feeding
Amount:Side feeding inlet amount=3:2；Described talcum moisture≤0.1%, oil absorption≤25 (g/100g), draw ratio is 20.
The particle diameter of above-mentioned high mesh number talcum powder is in 8000 ~ 11000 mesh.
Above-mentioned nucleator is metal carboxylate nucleator.
Above-mentioned lubricant is zinc stearate, ethylene bis stearic acid amide（EBS）, white oil 36# compounding uses.
Above-mentioned coupling agent is gamma-aminopropyl-triethoxy-silane（KH550）.
Above-mentioned antioxidant be four [β-（3,5- di-tert-butyl-hydroxy phenyls）Propionic acid] pentaerythritol ester（Antioxidant 1010）With three [2,4- di-tert-butyl-phenyls] phosphite esters（Irgasfos 168）Compounding use.
The above-mentioned special low after-contraction PP composite material preparation method of car insurance bar is as follows：
The first step：15 ~ 45 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.2 ~ 0.4 part of lubricant stearic acid zinc and ethylene bis stearic acid amide mixes 20 ~ 30 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 20 ~ 30 minutes in high-speed mixer A followed by 10 ~ 35 parts of high mesh number talcum powder are weighed.200 ~ 300 revs/min of the rotating speed of high mixer A, 50 ~ 70 DEG C of temperature.
Second step：100 parts of polypropylene are weighed, 15 ~ 30 parts of natural rubbers, 25 ~ 45 parts of toughener are subsequently added into 0.25 ~ 0.5 portion of nucleator in high-speed mixer B, and 0.2 ~ 0.3 part of coupling agent mixes 20 ~ 30 minutes.200 ~ 300 revs/min of the rotating speed of high mixer B, 50 ~ 70 DEG C of temperature.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, the antioxidant for adding 0.15 ~ 0.4 part mixes 20 ~ 30 minutes.0.2 ~ 0.4 part of white oil 36# is eventually adding to mix 20 ~ 30 minutes.200 ~ 300 revs/min of the rotating speed of high mixer B, 50 ~ 70 DEG C of temperature.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.
Excellent part of the invention is：
1. the present invention by add talcum and master feeding feed simultaneously and with high mesh number talcum powder, natural rubber compounding use, the PP composites of excellent combination property are obtained, while the shrinkage factor of PP composites is greatly reduced.
2. present invention defines talcum moisture≤0.1%, oil absorption≤25 (g/100g), draw ratio is 20.The addition of extraordinary talcum causes composite in processing, and melting mixing is uniform, be not in head block, tie rod broken strip the problems such as, the composite shrinkage factor and other mechanical properties for preparing are optimal.
3. the present invention is by adding nucleator so that PP composites keep less after-contraction after injection 24h ~ 48h after good stability of the dimension and spraying.
4. the present invention influences the crystal property of PP so as to reduce PP composite shrinkage factors by adding appropriate toughener in PP.
5. present invention process simply, is easily produced in enormous quantities.
Specific embodiment：
With reference to some embodiments, the invention will be further described with comparative example.Following examples are typical case of the invention, and protection scope of the present invention is not limited thereto.Melt index is performed according to ASTM D1238-10, is tested under the conditions of 230 DEG C, 2.16kg；Tensile property is performed according to ASTM D638-10, and test speed is 50mm/min；Bending property is performed according to ASTM D790-10, and test speed is 1.25mm/min；Chalpy impact performance is performed according to ASTM D256-10；Density is performed according to ASTM D792-13；Material shrinkage factor is performed according to ASTM D955-08（That is tested after Injection moulded part cooling 24h）.Spraying after-contraction is performed according to ASTM D955-08（Spraying post processing is carried out after injection cooling 24h, is tested after spraying post processing 24h.Note：Spraying conditions are 85 DEG C, 40min）.All of above test environment is：23℃、50%RH.
The main raw material(s) used in embodiment and comparative example is as follows：
COPP
Model：BX3920
Producer：South Korea SK；
COPP
Model：BX3900
Producer：South Korea SK；
COPP
Model：K7760H
Producer：Sinopec；
COPP
Model：EP5077
Producer：Li Ande Basels；
Toughener POE
Model：POE
8150 producers：LG-DOW；
Toughener MBS
Model：EM-500A
Producer：South Korea LG chemistry；
Toughener SEBS
Model：G1652
Producer：Section of U.S. rattan；
Nucleator
Model：HPN-20E
Producer：U.S.'s Milliken；
High mesh number talcum powder model：8000 mesh talcum powder
Producer：Liaoning Ai Hai；
High mesh number talcum powder model：11000 mesh talcum powder
Producer：Liaoning Ai Hai；
Lubricant
Model：Zinc stearate
Producer：Lianyun Harbour Huaming is safe；
Lubricant
Model：EBS
Producer：Indonesia's Chaoyang chemistry；
Lubricant
Model：White oil 36#
Producer：Connection petrochemical industry in Hainan in Maoming City；
Coupling agent
Model：KH550
Producer：Green chemical industry auxiliary reagent factory of Tianzhang City；
Antioxidant
Model：1010
Producer：Yixing City angel synthesis chemistry；
Antioxidant
Model：168
Producer：Yixing City angel synthesis chemistry.
Embodiment
1
The first step：15 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.08 part of lubricant stearic acid zinc and 0.12 part of lubricant ethylene bis stearic acid amide mixes 20 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 20 minutes in high-speed mixer A followed by 10 part of 8000 mesh talcum powder is weighed.200 revs/min of the rotating speed of high mixer A, temperature 50 C.
Second step：Weigh 60 parts of polypropylene BX3900,40 parts of polypropylene EP5077,15 parts of natural rubbers, 15 parts of toughener POE, 8150,7 parts of toughener EM-500A, 3 parts of toughener SEBS G1652 are in high-speed mixer B, 0.25 part of nucleator HPN-20E is subsequently added into, 0.2 part of coupling agent KH550 mixes 20 minutes.200 revs/min of the rotating speed of high mixer B, temperature 50 C.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.06 part of antioxidant 1010 is added, 0.09 part of irgasfos 168 mixes 20 minutes.0.2 part of white oil 36# is eventually adding to mix 20 minutes.200 revs/min of the rotating speed of high mixer B, temperature 50 C.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.
Performance is shown in Table -1.
Embodiment
2
The first step：45 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.21 part of lubricant stearic acid zinc and 0.19 part of lubricant ethylene bis stearic acid amide mixes 30 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 30 minutes in high-speed mixer A followed by 35 part of 11000 mesh talcum powder is weighed.300 revs/min of the rotating speed of high mixer A, temperature 70 C.
Second step：Weigh 58 parts of polypropylene BX3920,42 parts of polypropylene EP5077,30 parts of natural rubbers, 30 parts of toughener POE, 8150,10 parts of toughener EM-500A, 5 parts of toughener SEBS G1652 are in high-speed mixer B, 0.5 part of nucleator HPN-20E is subsequently added into, 0.3 part of coupling agent KH550 mixes 30 minutes.300 revs/min of the rotating speed of high mixer B, temperature 70 C.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.22 part of antioxidant 1010 is added, 0.18 part of irgasfos 168 mixes 30 minutes.0.4 part of white oil 36# is eventually adding to mix 30 minutes.300 revs/min of the rotating speed of high mixer B, temperature 70 C.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.
Performance is shown in Table -1.
Embodiment
3
The first step：21 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.09 part of lubricant stearic acid zinc and 0.17 part of lubricant ethylene bis stearic acid amide mixes 23 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 27 minutes in high-speed mixer A followed by 12 part of 11000 mesh talcum powder is weighed.234 revs/min of the rotating speed of high mixer A, 57 DEG C of temperature.
Second step：Weigh 43 parts of polypropylene K7760H, 57 parts of polypropylene EP5077,19 parts of natural rubbers, 19 parts of toughener POE, 8150,7 parts of toughener EM-500A, 5 parts of toughener SEBS G1652 are in high-speed mixer B, 0.29 part of nucleator HPN-20E is subsequently added into, 0.24 part of coupling agent KH550 mixes 24 minutes.209 revs/min of the rotating speed of high mixer B, 59 DEG C of temperature.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.16 part of antioxidant 1010 is added, 0.19 part of irgasfos 168 mixes 22 minutes.0.23 part of white oil 36# is eventually adding to mix 21 minutes.262 revs/min of the rotating speed of high mixer B, 62 DEG C of temperature.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.Performance is shown in Table -1.
Embodiment
4
The first step：29 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.08 part of lubricant stearic acid zinc and 0.12 part of lubricant ethylene bis stearic acid amide mixes 27 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 22 minutes in high-speed mixer A followed by 18 part of 8000 mesh talcum powder is weighed.260 revs/min of the rotating speed of high mixer A, 53 DEG C of temperature.
Second step：Weigh 40 parts of polypropylene BX3900,60 parts of polypropylene EP5077,22 parts of natural rubbers, 14 parts of toughener POE, 8150,12 parts of toughener EM-500A, 7 parts of toughener SEBS G1652 are in high-speed mixer B, 0.37 part of nucleator HPN-20E is subsequently added into, 0.28 part of coupling agent KH550 mixes 28 minutes.287 revs/min of the rotating speed of high mixer B, 59 DEG C of temperature.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.08 part of antioxidant 1010 is added, 0.09 part of irgasfos 168 mixes 29 minutes.0.21 part of white oil 36# is eventually adding to mix 20 minutes.220 revs/min of the rotating speed of high mixer B, 66 DEG C of temperature.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.Performance is shown in Table -1.
Embodiment
5
The first step：32 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.09 part of lubricant stearic acid zinc and 0.17 part of lubricant ethylene bis stearic acid amide mixes 21 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 29 minutes in high-speed mixer A followed by 21 part of 11000 mesh talcum powder is weighed.252 revs/min of the rotating speed of high mixer A, 67 DEG C of temperature.
Second step：Weigh 31 parts of polypropylene BX3920,69 parts of polypropylene EP5077,23 parts of natural rubbers, 15 parts of toughener POE, 8150,7 parts of toughener EM-500A, 4 parts of toughener SEBS G1652 are in high-speed mixer B, 0.33 part of nucleator HPN-20E is subsequently added into, 0.23 part of coupling agent KH550 mixes 27 minutes.290 revs/min of the rotating speed of high mixer B, temperature 70 C.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.07 part of antioxidant 1010 is added, 0.09 part of irgasfos 168 mixes 27 minutes.0.26 part of white oil 36# is eventually adding to mix 25 minutes.250 revs/min of the rotating speed of high mixer B, temperature 60 C.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.Performance is shown in Table -1.
Embodiment
6
The first step：38 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.07 part of lubricant stearic acid zinc and 0.14 part of lubricant ethylene bis stearic acid amide mixes 29 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 25 minutes in high-speed mixer A followed by 29 part of 8000 mesh talcum powder is weighed.240 revs/min of the rotating speed of high mixer A, 58 DEG C of temperature.
Second step：Weigh 50 parts of polypropylene K7760H, 50 parts of polypropylene EP5077,25 parts of natural rubbers, 21 parts of toughener POE, 8150,9 parts of toughener EM-500A, 6 parts of toughener SEBS G1652 are in high-speed mixer B, 0.39 part of nucleator HPN-20E is subsequently added into, 0.24 part of coupling agent KH550 mixes 29 minutes.290 revs/min of the rotating speed of high mixer B, 67 DEG C of temperature.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.06 part of antioxidant 1010 is added, 0.09 part of irgasfos 168 mixes 20 minutes.0.22 part of white oil 36# is eventually adding to mix 22 minutes.260 revs/min of the rotating speed of high mixer B, temperature 70 C.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.Performance is shown in Table -1.
Embodiment
7
The first step：43 parts of talcums are weighed in high-speed mixer A, it is subsequently added into 0.08 part of lubricant stearic acid zinc and 0.18 part of lubricant ethylene bis stearic acid amide mixes 30 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 23 minutes in high-speed mixer A followed by 34 part of 8000 mesh talcum powder is weighed.208 revs/min of the rotating speed of high mixer A, 64 DEG C of temperature.
Second step：Weigh 72 parts of polypropylene BX3920,28 parts of polypropylene EP5077,29 parts of natural rubbers, 23 parts of toughener POE 8150,12 parts of toughener EM-500A, 8 parts of toughener SEBS G1652 are subsequently added into 0.46 part of nucleator HPN-20E in high-speed mixer B, and 0.27 part of coupling agent KH550 mixes 28.4 minutes.200 revs/min of the rotating speed of high mixer B, 56.3 DEG C of temperature.
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, 0.06 part of antioxidant 1010 is added, 0.09 part of irgasfos 168 mixes 20 minutes.0.27 part of white oil 36# is eventually adding to mix 26.7 minutes.289 revs/min of the rotating speed of high mixer B, 52 DEG C of temperature.
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder.The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head.Screw diameter is 75 millimeters, and screw slenderness ratio is 44.
Performance is shown in Table -1.
Table -1
| Test event | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Comparative example（Polypropylene F401） |
| Density/(g/cm3) | 1.02 | 1.14 | 1.03 | 1.07 | 1.08 | 1.13 | 1.14 | 0.9 |
| Tensile strength/MPa | 47 | 41 | 44 | 42 | 46 | 46 | 43 | 23 |
| Bending strength/MPa | 53 | 58 | 56 | 54 | 52 | 55 | 57 | 32 |
| Bending modulus/MPa | 4414 | 5053 | 3741 | 3523 | 3210 | 3542 | 4121 | 1510 |
| Izod notched impact/(KJ/m2) | 47 | NB | 52 | 45 | 43 | NB | NB | 12 |
| Material shrinkage factor/% | 0.32 | 0.35 | 0.32 | 0.36 | 0.45 | 0.34 | 0.36 | 2.1 |
| Spraying post-shrinkage ratio/% | 0.30 | 0.22 | 0.22 | 0.31 | 0.29 | 0.21 | 0.22 | 1.9 |
As can be seen from the above embodiments, the PP composite material excellent combination property that the present invention is prepared, shrinkage factor is low, can be used for being used as bumper in high-end automobile.
Claims (10)
1. the special low after-contraction PP composite material of a kind of car insurance bar, it is characterised in that be made up of the component of following weight portion：
100 parts of polypropylene,
15 ~ 30 parts of natural rubber,
15 ~ 45 parts of talcum,
10 ~ 35 parts of high mesh number talcum powder,
25 ~ 45 parts of toughener,
0.25 ~ 0.5 part of nucleator,
Lubricant
0.4 ~ 0.8 part,
Coupling agent
0.2 ~ 0.3 part,
0.15 ~ 0.4 part of antioxidant.
2. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the polypropylene be two or more COPP compounding uses.
3. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, characterized in that, the toughener is ethylene-octene copolymer, MBS terpolymer, SIS/SEBS three's compounding use.
4. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that described talcum moisture≤0.1%, oil absorption≤25 (g/100g), draw ratio is 20.
5. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the particle diameter of the high mesh number talcum powder is in 8000 ~ 11000 mesh.
6. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the nucleator be metal carboxylate nucleator.
7. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the lubricant be zinc stearate, ethylene bis stearic acid amide, white oil 36# compounding uses.
8. as claimed in claim 1, a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the coupling agent is gamma-aminopropyl-triethoxy-silane.
9. as claimed in claim 1 a kind of special low after-contraction PP composite material of car insurance bar, it is characterised in that the antioxidant be four [β-（3,5- di-tert-butyl-hydroxy phenyls）Propionic acid] pentaerythritol ester and three [2,4- di-tert-butyl-phenyls] phosphite ester compounding uses.
10. the preparation method of the special low after-contraction PP composite material of car insurance bar described in a kind of any one of claim 1-9, it is characterised in that comprise the steps：
The first step：In weighing 15 ~ 45 parts of talcums and high-speed mixer A, it is subsequently added into 0.2 ~ 0.4 part of lubricant stearic acid zinc and ethylene bis stearic acid amide mixes 20 ~ 30 minutes, the amount for taking out the 2/5 of the talcum for mixing afterwards feeds for side feeding, mixes 20 ~ 30 minutes in high-speed mixer A followed by 10 ~ 35 parts of high mesh number talcum powder are weighed；200 ~ 300 revs/min of the rotating speed of high mixer A, 50 ~ 70 DEG C of temperature；
Second step：100 parts of polypropylene are weighed, 15 ~ 30 parts of natural rubbers, 25 ~ 45 parts of toughener are subsequently added into 0.25 ~ 0.5 portion of nucleator in high-speed mixer B, and 0.2 ~ 0.3 part of coupling agent mixes 20 ~ 30 minutes；200 ~ 300 revs/min of the rotating speed of high mixer B, 50 ~ 70 DEG C of temperature；
3rd step：Talcum and talc mixture in high-speed mixer A is added in high-speed mixer B, the antioxidant for adding 0.15 ~ 0.4 part mixes 20 ~ 30 minutes, is eventually adding 0.2 ~ 0.4 part of white oil 36# and mixes 20 ~ 30 minutes；200 ~ 300 revs/min of the rotating speed of high mixer B, 50 ~ 70 DEG C of temperature；
4th step：The material that above-mentioned 3rd step is mixed adds wire drawing granulation, cooling, dress bag in double screw extruder；The temperature of double screw extruder is followed successively by 170 DEG C, 195 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 225 DEG C, 215 DEG C, 215 DEG C, 210 DEG C from feeding section to head；Screw diameter is 75 millimeters, and screw slenderness ratio is 44.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102206383A (en) * | 2011-06-30 | 2011-10-05 | 广州市聚赛龙工程塑料有限公司 | Polypropylene composite for automobile bumpers, and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102206383A (en) * | 2011-06-30 | 2011-10-05 | 广州市聚赛龙工程塑料有限公司 | Polypropylene composite for automobile bumpers, and preparation method thereof |
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