CN106700253B - A kind of low-contraction low-density PP material and preparation method thereof - Google Patents
A kind of low-contraction low-density PP material and preparation method thereof Download PDFInfo
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- CN106700253B CN106700253B CN201611153457.1A CN201611153457A CN106700253B CN 106700253 B CN106700253 B CN 106700253B CN 201611153457 A CN201611153457 A CN 201611153457A CN 106700253 B CN106700253 B CN 106700253B
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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
- C08L23/12—Polypropene
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- 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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
-
- 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
-
- 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
- C08L2205/03—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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Abstract
The invention belongs to modified material technical fields, disclose a kind of low-contraction low-density PP material, according to parts by weight, including following components: 85 ~ 95 parts of acrylic resin, 1 ~ 5 part of polyolefin elastomer, 3 ~ 8 parts of rigid molecule chain material, 1 ~ 5 part of epoxy resin, 0.1 ~ 0.5 part of crosslinking agent, 0.1 ~ 0.5 part of cross-linking aid, 0.2 ~ 0.4 part of antioxidant, 0.2 ~ 0.4 part of weather resisting agent.The invention also discloses the preparation methods of the PP material.The material that the present invention need to only add minimal amount of big steric hindrance functional group rigid molecular segments can reach 0.7 ~ 0.9% low molding shrinkage, while influence on the strong and unyielding property of PP material slighter；Low (the < 0.93g/cm of density of material prepared by the present invention3), meet the needs of lightweight trend；And improve the scratch resistant performance of PP material.
Description
Technical field
The invention belongs to modified material technical fields, and in particular to a kind of low-contraction low-density PP material and its preparation side
Method.
Background technique
PP is one of five big general-purpose plastics, and density is low, is widely used in the fields such as automobile, household electrical appliances, toy.However, PP has
One maximum weakness is that molding shrinkage is big, this brings certain puzzlement to die sinking and molded article dimensional stability.At present
There are two ways to the most frequently used reduction PP shrinking percentage: it one is addition is mineral-filled, is reduced with the spatial position benefit of mineral
Material shrinkage.The method significant effect, but the density of material is increased, destroy the excellent of the low-density that PP material itself has
Gesture；The second is adding another high molecular material by the way of alloy, the structural integrity of PP material is destroyed, reduces material knot
Crystalline substance reduces material shrinkage, and it is just effective that the method needs to add larger amount of alloy compositions, will affect the machinery of PP material
Performance.
The patent document of Publication No. CN201511018344 discloses a kind of by addition mineral filler and olefin-modified
Agent synergistic prepares a kind of specific gravity down to 0.97g/cm3, the lower shrinkage low-gravity polypropylene material that shrinking percentage is 0.6~0.8%.
The patent document of Publication No. CN201310432874 discloses a kind of shrinking percentage that PP is reduced by way of PP/ABS alloy.
The patent document of Publication No. CN200810030391, which discloses, a kind of prepares molding shrinkage by way of PP/PS alloy
For 0.7~0.9% PP material, close to the level of ABS.The patent document of Publication No. CN201210124421 discloses one kind
The mode of In Situ Compatibilization reactive extrursion prepares lower molding shrinkage PO/PS alloy material.
However, current low-density lower shrinkage PP density generally accomplishes 0.97g/cm3 or more, compared to PP resin
The density of 0.9g/cm3, there is also a certain distance.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of PP material, neither damage PP material is original
Low-density advantage, and the PP mechanical property of materials is less influenced, while reaching the low requirement of molding shrinkage.
It is a further object of the present invention to provide the preparation methods of the PP material.
One of in order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of low-contraction low-density PP material, according to parts by weight, including following components:
85~95 parts of acrylic resin
1~5 part of polyolefin elastomer
3~8 parts of rigid molecule chain material
1~5 part of epoxy resin
0.1~0.5 part of crosslinking agent
0.1~0.5 part of cross-linking aid
0.2~0.4 part of antioxidant
0.2~0.4 part of weather resisting agent.
Further, the acrylic resin is selected from one of homopolymerization or copolymer polypropylene or two kinds of mixing
Object, melt index under the conditions of 230 DEG C/2.16kg are 1~100g/10min.
Further, the polyolefin elastomer is selected from ethylene-butene copolymer, ethylene-octene copolymer, ethylene-the third
At least one of alkene-diene copolymer；Optimal ethylene-octene copolymer, 1~15g/10min of melt index (ISO
1133,230 DEG C/2.16kg), octene content is greater than 25%.
Further, the rigid molecule chain material is selected from polystyrene, polymethyl methacrylate, styrene-propene
At least one of lonitrile copolymer；It is preferred that polymethyl methacrylate.
Further, the epoxy resin is selected from bisphenol A type epoxy resin, glycidyl ether type epoxy resin, organic titanium
Epoxy resin or cycloaliphatic epoxy resin；It is preferred that cycloaliphatic epoxy resin.
Further, the crosslinking agent is selected from cumyl peroxide, Isosorbide-5-Nitrae-dual-tert-butyl peroxy isopropyl base benzene, peroxidating
At least one of benzoyl, 2,5- dimethyl -2,5 two (t-butylperoxy) hexane；It is preferred that 1,4- dual-tert-butyl peroxide is different
Propylbenzene.
Further, the cross-linking aid is selected from polybutadiene and/or trimethylolpropane trimethacrylate, molecular weight <
6000。
Further, the antioxidant is selected from Hinered phenols antioxidant 1010 and/or phosphite ester antioxidant 168.
Further, the weather resisting agent is selected from hindered amine light stabilizer UV-3808PP5.
A method of low-contraction low-density PP material described in any one of claim 1 to 9 being prepared, specifically: will
Raw material is put into batch mixer and is uniformly mixed, and is then placed in double screw extruder extruding pelletization, and melt zone is pinched using three sections, 90 ° of rotation angles
Close element and a section small lead delivery element block installation, 350~450r/min of engine speed, extrusion process temperature is 180~
200℃。
Compared with prior art, the present invention is by adding a small amount of rigid molecule chain material, with crosslinking agent initiation grafting,
It reduces the structural integrity of PP material and reduces the crystallization of material, along with the grafting booster action of epoxy resin improves grafting
Efficiency, while the space steric effect of epoxy resin itself make mutually to wind between strand, to reach the effect of lower shrinkage
Fruit.So the present invention has following advantage:
1, it is wanted compared to PP alloy material although simple material blending method can also reduce the shrinking percentage of material
Reach lower shrinking percentage effect, non-PP ingredient needs to add that number is more, seriously affects the mechanical performance of PP material.The present invention
The material that minimal amount of big steric hindrance functional group rigid molecular segments need to only be added can reach 0.7~0.9% low inprocess shrinkage
Therefore rate while material prepared by the present invention reduces material molding shrinkage, influences the strong and unyielding property of PP material slighter.
2, compared to mineral-filled PP material, under the premise of reaching identical molding shrinkage, material prepared by the present invention
Expect density it is low (< 0.93g/cm3), meet the needs of lightweight trend, can directly substitute the mineral-filled PP material of high density without
With more mold exchange, it also can be made master batch for automobile/family's electric material and make shrinking percentage regulator.
3, by the addition of rigid particles and epoxy resin, the surface hardness of material is improved, improves the resistance to of PP material
Scratch performance.
4, the present invention uses special process screw combinations, and melt zone is small using three sections, 90 ° of rotation angle kneading members and a section
The installation of lead delivery element block, has the strong dispersibility of low-heat-generation, avoids material from hot-spot occur and influence to be grafted.
Specific embodiment
The present invention is described further combined with specific embodiments below.
In following embodiment, acrylic resin used is selected from the mixed of one of homopolymerization or copolymer polypropylene or two kinds
Object is closed, melt index under the conditions of 230 DEG C/2.16kg is 1~100g/10min.Crosslinking agent used is selected from peroxidating diisopropyl
Benzene, 1,4 bis tert butyl peroxy isopropyl benzene, benzoyl peroxide, in 2,5- dimethyl -2,5 two (t-butylperoxy) hexane
At least one.Cross-linking aid used is selected from polybutadiene and/or trimethylolpropane trimethacrylate, molecular weight < 6000.
Antioxidant used is selected from Hinered phenols antioxidant 1010 and/or phosphite ester antioxidant 168.Weather resisting agent used is selected from hindered amine
Class light stabilizer UV-3808PP5.It is purchased from commercially produced product.
Embodiment 1
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
85 parts of acrylic resin
5 parts of ethylene-octene copolymer
8 parts of polymethyl methacrylate
2 parts of bisphenol A type epoxy resin
0.2 part of crosslinking agent
0.2 part of cross-linking aid
0.4 part of antioxidant
0.2 part of weather resisting agent
By acrylic resin, ethylene-octene copolymer, polymethyl methacrylate, bisphenol A type epoxy resin, crosslinking agent,
Cross-linking aid, antioxidant, weather resisting agent are put into batch mixer and are uniformly mixed (3 minutes), are then placed in double screw extruder extruding pelletization,
Using three sections, 90 ° of rotation angle kneading members and the small lead delivery element block installation of a section, which has low melt zone
The strong dispersibility of heat, avoids material from hot-spot occur and influences to be grafted, 350~450r/min of engine speed, extrusion process
Temperature is 180~200 DEG C.Its performance parameter is as shown in table 1.
Embodiment 2
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
85 parts of acrylic resin
2 parts of ethylene-octene copolymer
8 parts of polymethyl methacrylate
5 parts of bisphenol A type epoxy resin
0.2 part of crosslinking agent
0.2 part of cross-linking aid
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Embodiment 3
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
95 parts of acrylic resin
5 parts of ethylene-octene copolymer
5 parts of polymethyl methacrylate
5 parts of bisphenol A type epoxy resin
0.5 part of crosslinking agent
0.5 part of cross-linking aid
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Embodiment 4
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
87 parts of acrylic resin
1 part of ethylene-butene copolymer
3 parts of polystyrene
1 part of glycerol epoxy resin
0.1 part of crosslinking agent
0.1 part of cross-linking aid
0.2 part of antioxidant
0.4 part of weather resisting agent
Its preparation process is the same as example 1.
Embodiment 5
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
92 parts of acrylic resin
3 parts of ethylene-propylene-diene copolymer
8 parts of styrene-acrylonitrile copolymer
2 parts of organotitanium epoxy resin
0.3 part of crosslinking agent
0.3 part of cross-linking aid
0.3 part of antioxidant
0.3 part of weather resisting agent
Its preparation process is the same as example 1.
Embodiment 6
A kind of low-contraction low-density polypropylene material, is made of the raw material of following parts by weight:
90 parts of acrylic resin
4 parts of ethylene-propylene-diene copolymer
6 parts of polystyrene
4 parts of cycloaliphatic epoxy resin
0.4 part of crosslinking agent
0.4 part of cross-linking aid
0.3 part of antioxidant
0.3 part of weather resisting agent
Its preparation process is the same as example 1.
Comparative example 1
A kind of polypropylene material is made of the raw material of following parts by weight:
90 parts of acrylic resin
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Comparative example 2
A kind of polypropylene alloy material is made of the raw material of following parts by weight:
90 parts of acrylic resin
5 parts of ethylene-octene copolymer
5 parts of polymethyl methacrylate
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Comparative example 3
A kind of polypropylene alloy material is made of the raw material of following parts by weight:
85 parts of acrylic resin
5 parts of ethylene-octene copolymer
5 parts of polymethyl methacrylate
5 parts of bisphenol A type epoxy resin
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Comparative example 4
A kind of polypropylene alloy material is made of the raw material of following parts by weight:
90 parts of acrylic resin
5 parts of ethylene-octene copolymer
5 parts of polymethyl methacrylate
0.5 part of crosslinking agent
0.5 part of cross-linking aid
0.4 part of antioxidant
0.2 part of weather resisting agent
For its preparation process with example 1, performance parameter is as shown in table 1.
Comparative example 5
A kind of polypropylene alloy material is made of the raw material of following parts by weight:
85 parts of acrylic resin
5 parts of ethylene-octene copolymer
5 parts of polymethyl methacrylate
5 parts of bisphenol A type epoxy resin
0.5 part of crosslinking agent
0.5 part of cross-linking aid
0.4 part of antioxidant
0.2 part of weather resisting agent
Acrylic resin, ethylene-octene copolymer, polymethyl methacrylate, epoxy resin, crosslinking agent, crosslinking are helped
Agent, antioxidant, weather resisting agent are put into batch mixer and are uniformly mixed (3 minutes), are then placed in double screw extruder extruding pelletization, technique spiral shell
High heat strong dispersibility design of the bar combination by common PP material, 350~450r/min of engine speed, extrusion process temperature are
180~200 DEG C.Its performance parameter is as shown in table 1.
Performance test
The above-mentioned material prepared is put into injection molding machine and beats mechanics batten, colour table and shrinking percentage plate, the mould of shrinking percentage plate
Tool specification is thickness 2.0mm, length 150mm, width 15mm, and mechanics batten and colour table Shooting Technique are 200 DEG C of temperature, injection molding pressure
Power 45bar, firing rate 45mm/s, pressure maintaining 15sec, shrinking percentage plate Shooting Technique are 200 DEG C of temperature, injection pressure 45bar, firing rate
45mm/s, pressure maintaining 5sec.Each case presses ISO testing standard, and the physical property measured, shrinking percentage, cross scraping color difference result are as follows:
The performance parameter of the component proportion and product of 1 various embodiments of the present invention of table and comparative example
By table 1 it follows that
1, it can be seen that by comparative example 2, comparative example 3, Examples 1 to 6 and be blended compared to General Physics, chemical graft
Mode significantly reduce the molding shrinkage of material, especially have the synergistic effect of epoxy resin, the inprocess shrinkage of material
Rate has apparent reduction.
2, by comparative example 1~4, Examples 1 to 6 it can be concluded that, pass through chemical graft rigid particles synergistic epoxy resin
The material of method preparation both had that molding shrinkage is low, but also with the low-density close to PP material, while to the object of PP material
Property influence it is little.After introducing Grafted rigid particle, the scratch resistant performance of material is obviously improved.
3, by comparative example 5 and Examples 1 to 6 it can be concluded that, the design of new screw group technology improves connecing for material
Branch efficiency, improves the compatibility of material, while reducing material molding shrinkage, improves the impact property of material.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of low-contraction low-density PP material, which is characterized in that according to parts by weight, including following components:
2. low-contraction low-density PP material according to claim 1, which is characterized in that the acrylic resin is selected from homopolymerization
Either one of copolymer polypropylene or two kinds of mixture, melt index under the conditions of 230 DEG C/2.16kg is 1~
100g/10min。
3. low-contraction low-density PP material according to claim 1, which is characterized in that the polyolefin elastomer is selected from second
At least one of alkene-butylene copolymer, ethylene-octene copolymer, ethylene-propylene-diene copolymer.
4. low-contraction low-density PP material according to claim 1, which is characterized in that the rigid molecule chain material is selected from
At least one of polystyrene, polymethyl methacrylate, styrene-acrylonitrile copolymer.
5. low-contraction low-density PP material according to claim 1, which is characterized in that the epoxy resin is selected from bisphenol-A
Type epoxy resin, glycidyl ether type epoxy resin, organotitanium epoxy resin or cycloaliphatic epoxy resin.
6. low-contraction low-density PP material according to claim 1, which is characterized in that the crosslinking agent is selected from peroxidating two
Isopropylbenzene, 1,4 bis tert butyl peroxy isopropyl benzene, benzoyl peroxide, 2,5- dimethyl -2,5 two (t-butylperoxy) oneself
At least one of alkane.
7. low-contraction low-density PP material according to claim 1, which is characterized in that the cross-linking aid is selected from polybutadiene
Alkene and/or trimethylolpropane trimethacrylate, molecular weight < 6000.
8. low-contraction low-density PP material according to claim 1, which is characterized in that the antioxidant is selected from Hinered phenols
Antioxidant 1010 and/or phosphite ester antioxidant 168.
9. low-contraction low-density PP material according to claim 1, which is characterized in that the weather resisting agent is selected from hindered amines
Light stabilizer UV-3808PP5.
10. a kind of method for preparing low-contraction low-density PP material described in any one of claim 1 to 9, which is characterized in that
Raw material is put into batch mixer to be uniformly mixed, is then placed in double screw extruder extruding pelletization, melt zone uses three sections, 90 ° of rotation angles
Kneading member and the small lead delivery element block installation of a section, 350~450r/min of engine speed, extrusion process temperature is 180
~200 DEG C.
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| DE202018101394U1 (en) * | 2018-03-13 | 2019-06-14 | Rehau Ag + Co | Polymer composition for a 3D printing process |
| CN112778634A (en) * | 2020-12-29 | 2021-05-11 | 成都金发科技新材料有限公司 | Rigid-tough balance low-density polypropylene composite material and preparation method and application thereof |
| CN112852057A (en) * | 2021-01-19 | 2021-05-28 | 安特普工程塑料（苏州）有限公司 | Anti-aging improved polypropylene composition and preparation method thereof |
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| CN102643484A (en) * | 2012-04-25 | 2012-08-22 | 金发科技股份有限公司 | In-situ compatibilization polyolefin/polystyrene alloy and preparation method and application thereof |
| CN103289188A (en) * | 2013-02-25 | 2013-09-11 | 金发科技股份有限公司 | Polypropylene compound, its preparation method and application |
| CN103819817A (en) * | 2014-03-11 | 2014-05-28 | 株洲时代新材料科技股份有限公司 | Polypropylene composition with high fluidity and high dimensional stability and preparation method thereof |
| CN105647004A (en) * | 2014-11-14 | 2016-06-08 | 王洪珠 | Environmentally-friendly modified car bumper |
| CN104592645A (en) * | 2014-12-22 | 2015-05-06 | 上海普利特复合材料股份有限公司 | Low-density low-shrinkage high-impact polypropylene composite material and preparation method thereof |
| CN105524354A (en) * | 2015-12-30 | 2016-04-27 | 宁波科普特新材料有限公司 | A low-shrinkage low-specific-gravity PP material and a preparing method thereof |
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