CN104558818A - Stable-size polypropylene composition and preparation method thereof - Google Patents
Stable-size polypropylene composition and preparation method thereof Download PDFInfo
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- 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
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Abstract
The invention belongs to the field of high molecular materials, and relates to a stable-size polypropylene composition and a preparation method thereof. The stable-size polypropylene composition comprises the following raw materials in parts by weight: 100 parts of PP resin, 28-50 parts of mLLDPE resin, 2-9 parts of a compatilizer, 25-43 parts of basic magnesium sulfate whisker, 1-2.5 parts of a lubricating agent, 1-1.5 parts of an antioxygen and 1-3 parts of other auxiliary agents. The preparation method comprises the following steps: drying the basic magnesium sulfate whisker, and mixing and stirring the dried basic magnesium sulfate whisker and a silane coupling agent at high speed; putting rest materials into a blend, and mixing and stirring to obtain a mixture; putting the mixture into an extruder, extruding, granulating and drying to obtain the stable-size polypropylene composition. The stable-size polypropylene composition has excellent size stability and heat resistance, has excellent rigidity and toughness balancing performance and relatively high processing fluidity, can be used as a production raw material of a PP material for a large-size car inner decoration.
Description
Technical field
The present invention relates to polypropene composition of a kind of dimensional stabilizing and preparation method thereof, belong to polymeric material field.
Background technology
Along with demand for development and the environmental requirement of automotive engineering, safe, energy-conservation, comfortable, practical, clean and tidy, attractive in appearance etc. requirement plastic component being comprised to automotive upholstery is also improved day by day.The Plastic Resin that automotive upholstery is conventional is polypropylene (PP), but it is large to there is shrinking percentage in general PP material, poor impact resistance, the shortcomings such as loss of properties on aging, the application requiring of inside gadget can not be met, automobile large size inside gadget comprises dashboard, reveal backplate etc. and then requires that material will have better thermotolerance, warpage-resistant and rigidity-toughness balanced performance, and therefore must carry out modification could apply.
Current automotive upholstery (the comprising large size inside gadget) method of modifying that PP material is general adds the properties-correcting agent such as a certain amount of toughner, weighting agent exactly in PP material, plays filled toughening effect, improves the over-all properties of material.Toughner generally adopts rubber, SIS/SEBS (SEBS), ethylene-propylene-octene terpolymer (POE), ethylene-vinyl acetate copolymer (EVA), can add the toughness that linear low density polyethylene (LLDPE), high density polyethylene(HDPE) (HDPE) improve material further in addition.Although this type of toughner significantly can improve impact toughness and the lower temperature resistance of PP, material cost is high, or intensity and poor rigidity, or fusing point and heat-drawn wire low.Weighting agent is generally the inorganic fillers of high heat-resisting, high rigidity, the general mineral filler system of current automotive upholstery mainly contains two classes: common scaly talc powder and spherical calcium carbonate, its aspect ratio is lower, another kind of is the filler with high aspect ratio, as: the materials such as bamboo fibers, carbon fiber and glass fibre.The dimensional stability of talcum powder, talcum grain, calcium carbonate material under certain content is not high, bamboo fibers is also immature as its technology of filler, carbon fiber cost is high, glass fibre can be used as toughener, significantly improve the rigidity of material, also there is excellent thermotolerance and dimensional stability, but the smoothness on surface, aesthetic property are poor, the easy buckling deformation of large size inside gadget, is subject to the restriction of automobile industry in some automotive upholstery Application Areas.
The inside gadgets such as fascia, reveal backplate are large due to surface size, more easily warpage and thermal distortion occur, and therefore require that the starting material used are except having certain rigidity and impact property, the thermotolerance that also will have, warpage-resistant performance.Simultaneously because volume is large, complex-shaped, flow length is long, also require that material has good mobility.Table 1 and table 2 are performance requriementss of partial domestic automobile and Volkswagen large-sized inside gadget PP material.
Domestic automobile large size inside gadget PP starting material requirement in table 1 part
Table 2 Volkswagen large size inside gadget PP starting material require (TL52388 standard)
Chinese patent CN101948586A discloses a kind of modified polypropylene composite material being applicable to manufacture automotive upholstery, and comprising: polypropylene, elastomerics, mineral filler and auxiliary agent, according to weight part, the weight part of above-mentioned composition is respectively: polypropylene 70 ~ 90; Elastomerics 5 ~ 10; Mineral filler 5 ~ 20; Auxiliary agent 0.1 ~ 1; Wherein, the weight part sum of polypropylene, elastomerics and mineral filler is 100 parts.This matrix material uses fine mineral filler, not through surface treatment, although have employed a small amount of maleic anhydride inoculated polypropylene is compatilizer, but filler grain also easily assembles conglomeration when high density, thus consistency and dispersiveness can not be guaranteed, constant product quality is poor, and the matrix material of this type of filler has poor dimensional stability, indulges the shortcomings such as lateral shrinkage differs greatly, and the MFR of this matrix material can not meet part inside gadget PP material to the requirement of mobility in addition.
Chinese patent CN1560124 discloses a kind of acrylic resin matrix material, the microballon of the acrylic resin containing 30-90 % by weight, 5-70 % by weight, the inorganic micron of 0-50 % by weight or nanoparticle, 0-50 % by weight primitive fiber.This matrix material rigidity/toughness is balanced, product surface is excellent and surface hardness is higher, not easily scratch, but due in composition containing a certain amount of elastic body toughening agent, cause the heat-drawn wire of product low.
Chinese patent CN1065554C then discloses a kind of thermoplastic resin composition of automobile instrument disk material, major ingredient comprises the toughner of specific crystalline polypropylene resin, magnesium sulfate and talcum powder mineral filler, Ethylene/Butylene-1 random copolymer rubber and ethylene-propylene random copolymer rubber, said composition has toughness required by panel board material and rigidity and good surface quality and short production cycle, but same due to containing a certain amount of rubber toughening agent in composition, cause the heat-drawn wire of product low.
Chinese patent CN102952342A discloses a kind of Low-shrinkage polypropylene composition, mainly resin based on two kinds of impact copolymer polypropylene, by adding inorganic powder, metallocene linear-low density polyethylene, EPDM or POE toughner and the weather-proof auxiliary agents such as talcum powder, obtain the modified poly propylene composition with lower shrinking percentage, low cost, excellent rigidity-toughness balanced performance and higher luster performance through extruding pelletization.Although the shrinking percentage of product is lower, but still the space be improved, and make weighting agent owing to have employed the inorganic powders such as talcum powder, the rigidity of product is relatively low, can not meet the rigid requirements of the large-sized inside gadget of automobile.
Summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, polypropene composition of a kind of dimensional stabilizing and preparation method thereof is provided, said composition not only has excellent in dimension stability and thermotolerance, said composition also has excellent rigidity-toughness balanced performance and higher processing fluidity, as the raw materials for production of automobile large-sized inside gadget PP material simultaneously.
The polypropene composition of dimensional stabilizing of the present invention, is made up of following raw material, and the parts by weight of each component are:
PP resin: 100; MLLDPE resin: 28 ~ 50; Compatilizer: 2 ~ 9; Alkali magnesium sulfate crystal whisker: 25 ~ 43; Lubricant: 1 ~ 2.5; Oxidation inhibitor: 1 ~ 1.5; Other auxiliary agent: 1 ~ 3.
Wherein, the present invention utilizes alkali magnesium sulfate crystal whisker to have the characteristic of high aspect ratio, significantly improves the intensity of material, rigidity and dimensional stability, keeps product still to have good surface smoothness and aesthetic property simultaneously.
PP resin is one or more of copolymerization or homopolymerization PP resin, and its melt mass flow rate (MFR) (2.16Kg counterweight) is 1.5 ~ 30.0g/10min; Copolymerization PP resin is the multipolymer of ethene and propylene, and wherein, the mass content of ethene is 6 ~ 14%.
The metallocene linear-low density polyethylene that the mLLDPE resin used is a kind of high melt mass flow rate, its MFR(2.16Kg counterweight) be 20.0 ~ 50.0g/10min.This material coordinates a small amount of compatilizer to replace conventional elastomers as toughner, cheap, its fusing point and heat-drawn wire high, good fluidity, and there is certain intensity and toughness, degree of crystallinity is low, also can improve the shrinking percentage of PP resin, solves resistance toheat that conventional toughner brings to material and the problem that processing fluidity reduces.Its consumption is preferably 30 ~ 42 parts.
Compatilizer is maleic anhydride modified SIS/SEBS (SEBS-g-MAH), styrene content is 13 ~ 33%, it is 0.5 ~ 2.5% that maleic anhydride connects skill rate, compatilizer greatly can not only improve the consistency between PP resin, mLLDPE, alkali magnesium sulfate crystal whisker three, also improve the toughness of material further as a kind of auxiliary toughener, its consumption is preferably 2 ~ 8 parts.
Wherein, SIS/SEBS (SEBS-g-MAH) is FG1901G or FG1924G preferably, and wherein, the ethylene content 13% of FG1924G, connects skill rate 0.8%; The styrene content 30% of FG1901G, connects skill rate 1.6%.The manufacturer of FG1901G, FG1924G is Kraton Polymer company of the U.S..
Alkali magnesium sulfate crystal whisker is through surface treatment agent activation treatment, and be a kind of filler, it consists of MgSO
45Mg (OH)
23H
2o, have the firm reinforcement of excellent increasing and fire retardation, its product surface is also more smooth.The diameter of alkali magnesium sulfate crystal whisker is 0.5 ~ 1 μm, and length-to-diameter ratio is 100 ~ 200, and consumption is 30 ~ 40 parts.
Wherein, surface treatment agent is silane coupling agent, and addition is 0.5 ~ 2% of alkali magnesium sulfate crystal whisker weight.
Lubricant is one or more of stearic acid, calcium stearate, Zinic stearas, barium stearate or ethylene bis stearic acid amide (EBS).
Oxidation inhibitor is that Hinered phenols antioxidant 1010 is composite with phosphite ester kind antioxidant 168, and mass ratio is 1:1 ~ 2:1.
Silane coupling agent is KH550, and manufacturer is dawn chemical plant, Nanjing.
Other auxiliary agents are one or more in photostabilizer, brightening agent, tinting material or dicumyl peroxide (DCP) auxiliary agent.
To be benzophenone light stabilizer UV-531 compare mixture with the one of hindered amine as light stabilizer UV-770 or UV-531 and UV-770 by 0.5:1 ~ 1:0.5 quality to photostabilizer.
Brightening agent is the one in low-molecular-weight BAB type multipolymer TAS-2, TAS-2A or a TAF.The manufacturer of TAS-2, TAS-2A and TAF is photochemistry auxiliary agent company limited of Wuxian state.
Tinting material is the one in carbon black, red iron oxide, lemon yellow or titanium table basket.
The present invention adopts parallel dual-screw extruding machine extruding pelletization, and preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 60-80 DEG C of oven dry, then by dry alkali magnesium sulfate crystal whisker and silane coupling agent at mix and blend 15-20 minute, wherein, stirring velocity is 800-2000 rev/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 5-8 minute, stirring velocity is 200-600 rev/min;
(3) mixture of step (2) is melt extruded granulation at 180-210 DEG C, 60-80 DEG C of dry 20-40 minute obtained product.
Wherein, churning time preferably 15 minutes in step (1), stirring velocity preferably 1000 revs/min.
Churning time preferably 5 minutes in step (2), stirring velocity preferably 500 revs/min.
Polypropene composition of the present invention is applicable to the large-sized inside gadget of lot of domestic and foreign automobile as the raw materials for production of the plastic component such as dashboard, reveal backplate.
Compared with prior art, the present invention has following beneficial effect:
(1) preparation method's technique of the present invention is simple, with low cost; (2) the complete environmental protection of starting material used, the inside gadget free from extraneous odour of production, surface smoothing; (3) polypropene composition not only parasystole rate and vertical shrinkage rate little, have good dimensional stability and resistance to warpage performance, and have heat-drawn wire (0.45MPa) high (>=120 DEG C), resistance toheat is good; (4) polypropene composition also has rational processing fluidity, rigidity and toughness simultaneously, adapts to the requirement of large size interior trim plastic component.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of polypropene composition of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
The raw material that the present embodiment is used and parts by weight thereof are:
Copolymerization PP resin: 100;
mLLDPE：50；
FG1924G：：6；
Alkali magnesium sulfate crystal whisker: 40;
Stearic acid: 0.5;
Zinic stearas: 1.5;
Antioxidant 1010/168:0.5/0.5;
UV-531：0.8；
Carbon black: 0.2.
Wherein, the MFR=26.5g/10min of copolymerization PP resin, ethylene content 12%; The MFR=20g/10min of mLLDPE; 0.7 μm, the footpath of alkali magnesium sulfate crystal whisker, length-to-diameter ratio 150.
Preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 80 DEG C of oven dry, then by the alkali magnesium sulfate crystal whisker of oven dry and quality be the KH550 of 0.5% of alkali magnesium sulfate weight high speed agitator high speed mix and blend 20 minutes, wherein, stirring velocity is 800 revs/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 5 minutes, stirring velocity is 600 revs/min;
(3) mixture of step (2) is placed in parallel dual-screw extruding machine, at 180-210 DEG C, melt extrudes granulation, 60 DEG C of dryings, 40 minutes obtained products.
Embodiment 2
The raw material that the present embodiment is used and parts by weight thereof are:
Copolymerization PP resin: 67;
Homopolymerization PP resin: 33;
mLLDPE：34；
FG1924G：2.0；
Alkali magnesium sulfate crystal whisker: 25;
EBS：2.5；
Antioxidant 1010/168:0.8/0.4;
UV-770：0.6；
Lemon yellow: 0.15;
TAF brightening agent: 1.2.
Wherein, the MFR=9.1g/10min of copolymerization PP resin, ethylene content 10%; The MFR=3.0g/10min of homopolymerization PP resin; The MFR=30g/10min of mLLDPE; 0.5 μm, the footpath of alkali magnesium sulfate crystal whisker, length-to-diameter ratio 200.
Preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 60 DEG C of oven dry, then by the alkali magnesium sulfate crystal whisker of oven dry and quality be the 1%KH550 of alkali magnesium sulfate weight high speed agitator high speed mix and blend 20 minutes, wherein, stirring velocity is 1000 revs/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 6 minutes, stirring velocity is 500 revs/min;
(3) mixture of step (2) is placed in parallel dual-screw extruding machine, at 180-210 DEG C, melt extrudes granulation, 75 DEG C of dryings, 30 minutes obtained products.
Embodiment 3:
The raw material that the present embodiment is used and parts by weight thereof are:
Copolymerization PP resin 1:71;
Copolymerization PP resin 2:29;
mLLDPE：28；
FG1901G：9；
Alkali magnesium sulfate crystal whisker: 43;
Calcium stearate: 0.6;
Barium stearate: 0.2
Stearic acid: 0.2
Antioxidant 1010/168:0.8/0.4;
UV-531：0.5；
UV-770：0.5；
Titanium table is blue: 0.2;
TAS-2A：1.0；
DCP：0.8。
Wherein, the MFR=26.5g/10min of copolymerization PP resin, ethylene content 12%; The MFR=1.5g/10min of copolymerization PP resin, ethylene content 8%; The MFR=50g/10min of mLLDPE; 1.0 μm, the footpath of alkali magnesium sulfate crystal whisker, length-to-diameter ratio 100.
Preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 70 DEG C of oven dry, then by the alkali magnesium sulfate crystal whisker of oven dry and quality be the 2%KH550 of alkali magnesium sulfate weight high speed agitator high speed mix and blend 18 minutes, wherein, stirring velocity is 1500 revs/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 8 minutes, stirring velocity is 200 revs/min;
(3) mixture of step (2) is placed in parallel dual-screw extruding machine, at 180-210 DEG C, melt extrudes granulation, 80 DEG C of dryings, 30 minutes obtained products.
Embodiment 4
The raw material that the present embodiment is used and parts by weight thereof are:
Copolymerization PP resin: 64;
Copolymerization PP resin: 36;
mLLDPE：42；
FG1924G：9；
Alkali magnesium sulfate crystal whisker: 27;
Zinic stearas: 1.0;
Antioxidant 1010/168:1.0/0.5;
UV-531：0.3；
UV-770：0.6；
Lemon yellow: 0.18.
Wherein, the MFR=9.0g/10min of copolymerization PP resin, ethylene content 12%; The MFR=11g/10min of copolymerization PP resin, ethylene content 6.5%; The MFR=30g/10min of mLLDPE; 0.8 μm, the footpath of alkali magnesium sulfate crystal whisker, length-to-diameter ratio 120.
Preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 80 DEG C of oven dry, then by the alkali magnesium sulfate crystal whisker of oven dry and quality be the 1.5%KH550 of alkali magnesium sulfate weight high speed agitator high speed mix and blend 15 minutes, wherein, stirring velocity is 2000 revs/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 5 minutes, stirring velocity is 500 revs/min;
(3) mixture of step (2) is placed in parallel dual-screw extruding machine, at 180-210 DEG C, melt extrudes granulation, 70 DEG C of dryings, 35 minutes obtained products.
Embodiment 5
The raw material that the present embodiment is used and parts by weight thereof are:
Copolymerization PP resin: 63;
Copolymerization PP resin: 37;
mLLDPE：31；
FG1901G：5.5；
MOS：42；
EBS：0.5；
Barium stearate: 1.0;
Antioxidant 1010/168:0.6/0.4;
UV-531：0.8；
UV-770：0.4；
Carbon black: 0.2;
TAF-2 brightening agent: 0.9;
DCP：0.5。
Wherein, the MFR=1.5g/10min of copolymerization PP resin, ethylene content 8%; The MFR=3.0g/10min of copolymerization PP resin, ethylene content 6.5%; The MFR=50g/10min of mLLDPE; 0.7 μm, the footpath of alkali magnesium sulfate crystal whisker, length-to-diameter ratio 150.
Preparation process is as follows:
(1) first by alkali magnesium sulfate crystal whisker through 65 DEG C of oven dry, then by the alkali magnesium sulfate crystal whisker of oven dry and quality be the 1.5%KH550 of alkali magnesium sulfate weight high speed agitator high speed mix and blend 15 minutes, wherein, stirring velocity is 1000 revs/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 7 minutes, stirring velocity is 350 revs/min;
(3) mixture of step (2) is placed in parallel dual-screw extruding machine, at 180-210 DEG C, melt extrudes granulation, 80 DEG C of dryings, 20 minutes obtained products.
Comparative example 1
The component of this comparative example and content (parts by weight) as follows, disclosed in its patent of the material made, performance is in table 4.
Polypropylene: 125;
Polypropylene 3:22;
ENGAGE8200：8；
Glass microballon: 15
Talcum powder 3000:13;
Barium sulfate: 2;
Magnesium sulfate crystal whisker: 10;
Coupling agent KH560:0.5;
Antioxidant 1010/168:0.1/0.1;
CAST：0.1；
Toner: 1.
Preparation method is identical with embodiment 1.
Comparative example 2
Chinese patent 96100262.X discloses a kind of thermoplastic resin composition of automobile instrument disk material, with the embodiment 1 in patent for comparative example:
Main raw material(s) proportioning and preparation method are: by 68%(weight percent) crystalline propylene-ethylene segmented copolymer (BC-1), 3%(weight percent) Ethylene/Butylene-1 copolymer rubber (EBR), 3%(weight percent) ethylene-propylene copolymer type rubber (EPR), 13%(weight percent) average fiber length is 10-30 μm and fiber diameter is that the threadiness of 0.5-1 μm is containing oxygen magnesium sulfate (WH) and 13%(weight percent) median size is that the talcum (TAIC) of 2 μm mixes with various stablizer, thereafter, gained mixture is mediated in predefined conditions, then injection moulding becomes testpieces, disclosed in patent, performance is in table 4.
Comparative example 3
A kind of Low-shrinkage polypropylene composition and preparation method disclosed in Chinese patent 201110252092.9, with embodiment 8 for comparative example, under its composition and ratio (parts by weight) and preparation method are shown in:
Impact polypropylene resin (QP81N): 55;
Impact polypropylene resin (SP179): 13;
Calcium carbonate: 20;
mLLDPE(mPE-200904)：10；
Toughner Engage8402:2;
UV light absorber (TINUV571): 0.1.
Each composition is placed in homogenizer, under the rotating speed of 1450 ± 30r/min, stirs 4 ± 1min, mix; Then the Preblend obtained is joined melting mixing in parallel dual-screw extruding machine, forcing machine the highest section of temperature is 220 ± 10 DEG C, forcing machine engine speed 180 ± 10r/min, feeding rotating speed 40 ± 5r/min, extruding pelletization obtains the modified poly propylene composition with low-shrinkage, and disclosed in composition patent, performance is in table 4.
Embodiment 1-5 polypropene composition the performance test results, as table 3.
Table 3 polypropene composition embodiment the performance test results
Performance disclosed in table 4 comparative example patent
Contrast known by embodiment test result and comparative example test result, mixture in comparative example has respective defect in performance, or heat-drawn wire is low, or rigidity is not enough, although or shrinking percentage is lower, but intensity and modulus in flexure are also lower, and polypropene composition of the present invention not only parasystole rate, vertical shrinkage rate are low, in both direction, difference is little, and heat-drawn wire is high, high comprehensive performance, meets the requirement (see table 1 and table 2) of most large size inside gadget PP material to technology traditional performance.
Claims (10)
1. a polypropene composition for dimensional stabilizing, is characterized in that, is made up of following raw material, and the parts by weight of each component are:
2. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, PP resin is one or more of copolymerization or homopolymerization PP resin, and its melt mass flow rate is 1.5 ~ 30.0g/10min; Copolymerization PP resin is the multipolymer of ethene and propylene, and wherein, the mass content of ethene is 6 ~ 14%.
3. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, compatilizer is maleic anhydride modified SIS/SEBS, and styrene content is 13 ~ 33%.
4. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, alkali magnesium sulfate crystal whisker is through surface treatment agent activation treatment, and the diameter of alkali magnesium sulfate crystal whisker is 0.5 ~ 1 μm, and length-to-diameter ratio is 100 ~ 200.
5. the polypropene composition of dimensional stabilizing according to claim 4, is characterized in that, surface treatment agent is silane coupling agent, and addition is 0.5 ~ 2% of alkali magnesium sulfate crystal whisker weight.
6. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, lubricant is one or more in stearic acid, calcium stearate, Zinic stearas, barium stearate or ethylene bis stearic acid amide.
7. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, oxidation inhibitor is that Hinered phenols antioxidant 1010 is composite with phosphite ester kind antioxidant 168, and mass ratio is 1:1 ~ 2:1.
8. the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, other auxiliary agents are one or more in photostabilizer, brightening agent, tinting material or dicumyl peroxide auxiliary agent.
9. the polypropene composition of dimensional stabilizing according to claim 8, it is characterized in that, to be benzophenone light stabilizer UV-531 compare mixture with the one of hindered amine as light stabilizer UV-770 or UV-531 and UV-770 by 0.5:1 ~ 1:0.5 quality to photostabilizer; Brightening agent is the one in low-molecular-weight BAB type multipolymer TAS-2, TAS-2A or TAF; Tinting material is the one in carbon black, red iron oxide, lemon yellow or titanium table basket.
10. a preparation method for the polypropene composition of dimensional stabilizing according to claim 1, is characterized in that, comprises the following steps:
(1) first by alkali magnesium sulfate crystal whisker through 60-80 DEG C of oven dry, then by dry alkali magnesium sulfate crystal whisker and silane coupling agent at mix and blend 15-20 minute, wherein, stirring velocity is 800-2000 rev/min;
(2) in the blend of step (1), drop into PP resin, mLLDPE resin, compatilizer, lubricant, oxidation inhibitor and other auxiliary agent, mix and blend 5-8 minute, stirring velocity is 200-600 rev/min;
(3) mixture of step (2) is melt extruded granulation at 180-210 DEG C, 60-80 DEG C of dry 20-40 minute obtained product.
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