CN108456363A - A kind of scratch-resistant polypropylene composition - Google Patents
A kind of scratch-resistant polypropylene composition Download PDFInfo
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- CN108456363A CN108456363A CN201810227582.5A CN201810227582A CN108456363A CN 108456363 A CN108456363 A CN 108456363A CN 201810227582 A CN201810227582 A CN 201810227582A CN 108456363 A CN108456363 A CN 108456363A
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- Prior art keywords
- scratch
- resistant
- polypropylene composition
- resistant polypropylene
- agent
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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
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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
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a kind of scratch-resistant polypropylene compositions, including following parts by weight of component：1~7 part of 40~80 parts of acrylic resin and damage resistant agent；The damage resistant agent is vinyl peroxide grafted copolymer.Scratch-resistant polypropylene composition of the present invention is damage resistant agent by selecting vinyl peroxide grafted object, reduces skin-friction coefficient, improves the scratch resistant performance of polypropylene material, and will not it is tacky, scratch resistant performance is permanent, material mechanical performance is not influenced；The scratch-resistant polypropylene composition has excellent long-term scratch resistant performance, low tacky and strong mechanical performance characteristic；The scratch-resistant polypropylene composition can be used for preparing inner and outer decorative parts of automobile, improve scratch resistant performance, keep product beautiful.
Description
Technical field
The present invention relates to a kind of polypropene compositions, and in particular to a kind of scratch-resistant polypropylene composition.
Background technology
Polypropylene (PP) has many advantages, such as low density, easy processing, excellent in mechanical performance, is widely used in auto industry, family
Electrically and mechanically field.But polypropylene material case hardness is low, scratch resistant performance is poor, to limit it in automotive upholstery
Application, such as instrument board, door-plate, column.These parts during production, transport and use, inevitably by
The grazing of hard object influences beautiful and durability to cut occur.
In order to improve the scratch resistant performance of polypropylene material, many patents solve the resistance to of polypropylene material through a variety of ways
Scuffing problem.CN106700254A is improved using polyethylene wax and small molecule antistatic agent to reduce material surface friction coefficient
Scratch resistant performance.CN201610318438 is added to using ionic copolymer such as ethylene-methyl methacrylate sodium salt in PP materials,
Ionic copolymer moves to surface in material forming process, improves case hardness to improve scratch resistant performance.
CN201610009345 improves the scratch resistant performance of PP materials using dimethyl silicone polymer for damage resistant agent.
However the PP materials for auto parts and components not only require good scratch resistant performance, it is also desirable to have excellent
Mechanical property, long-term scratch resistant performance and good appearance.And in the prior art usually using type damage resistant agent of moving out, this can cause
It is precipitated tacky, influences product appearance.The agent of organic silicon damage resistant can reduce the impact property of PP materials.Therefore, this field it is still necessary to
Develop it is a kind of preparing the excellent polypropylene material of simple and long-term scratch resistant performance, be used for inner and outer decorative parts of automobile.
Invention content
A kind of scratch-resistant polypropylene combination is provided it is an object of the invention to overcome the shortcomings of the prior art place
Object.
To achieve the above object, the technical solution that the present invention takes is：A kind of scratch-resistant polypropylene composition, including it is as follows
Parts by weight of component：1~7 part of 40~80 parts of acrylic resin and damage resistant agent；The damage resistant agent is that vinyl peroxide connects
Graft copolymer.
The present invention uses vinyl peroxide grafted copolymer as damage resistant agent, in polypropylene material forming process
In, vinyl peroxide grafted copolymer can be enriched in material surface, reduced skin-friction coefficient, improved polypropylene material
Scratch resistant performance, and will not it is tacky, scratch resistant performance is permanent, on material mechanical performance do not influence.
When damage resistant agent content is too low, the scratch resistant performance of polypropylene material is poor, when the too high levels of damage resistant agent,
The impact property of polypropylene material reduces.Scratch-resistant polypropylene composition of the present invention uses the acrylic resin of said ratio
When with damage resistant agent, the polypropylene material of gained can have preferable scratch resistant performance and preferable mechanical property.
The acrylic resin is acrylic resin copolymer or homopolypropylene resin；The acrylic resin at 230 DEG C,
Under 2.16Kg loads, melt mass flow rate (MFR) is 1~100g/10min.
The vinyl peroxide grafted copolymer preparation process is：With polypropylene, vinyl peroxide (CH2=
CH-(CH2) n-OOR, n=10~20, R=alkane) it is raw material, it is squeezed out by double screw extruder melting mixing, pelletizing obtains
Vinyl peroxide grafted copolymer.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the vinyl peroxide grafted
The grafting rate of copolymer is 0.5~1.5%.
When the grafting rate of vinyl peroxide grafted copolymer is too low, the scratch resistant performance of polypropylene material is poor,
With the increase of the grafting rate of vinyl peroxide grafted copolymer, polyacrylic scratch resistant performance first increases to be declined afterwards, is resisted
Impact property declines, when the grafting rate of vinyl peroxide grafted copolymer is excessively high, under the impact property of polypropylene material
Drop；When the grafting rate of vinyl peroxide grafted copolymer is 0.5~1.5%, polypropylene material has preferably scratch-resistant
Hinder performance and shock resistance.
As the more preferable embodiment of scratch-resistant polypropylene composition of the present invention, the vinyl peroxide connects
The grafting rate of graft copolymer is 0.7~1.2%.
When the grafting rate of vinyl peroxide grafted copolymer is 0.7~1.2%, the scratch resistance of polypropylene material
It can be with shock resistance more preferably.
As the most preferred embodiment of scratch-resistant polypropylene composition of the present invention, the vinyl peroxide connects
The grafting rate of graft copolymer is 1.0%.
When the grafting rate of vinyl peroxide grafted copolymer be 1.0% when, the scratch resistant performance of polypropylene material and
Shock resistance is best.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the scratch-resistant polypropylene composition
It also include following parts by weight of component：0.2~1 part of 0~30 part of toughener, 0~30 part of filler, 0.5~1 part of pigment and auxiliary agent.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the damage resistant agent is described scratch-resistant
It is 1.5~6% to hinder the weight percentage in polypropene composition.With the increase of damage resistant agent additive amount, scratch resistant performance
It is gradually increased, but shock resistance continuously decreases, and is obtained by inventor's test of many times, the damage resistant agent is described scratch-resistant
When to hinder additive amount in polypropene composition be 1.5~6%, scratch resistant performance and mechanical property are preferable.
As the more preferable embodiment of scratch-resistant polypropylene composition of the present invention, the damage resistant agent is described resistance to
It is 2~4% to scratch the weight percentage in polypropene composition.The damage resistant agent uses above-mentioned additive amount in the composition
When, scratch resistant performance and mechanical property are more excellent.
As the most preferred embodiment of scratch-resistant polypropylene composition of the present invention, the damage resistant agent is described resistance to
It is 3% to scratch the weight percentage in polypropene composition.When the damage resistant agent uses above-mentioned additive amount in the composition,
Scratch resistant performance and mechanical property can achieve the effect that ideal.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the toughener is 10~20 weight
Part.When toughening agent content is too low, the toughness of polypropylene material is relatively low；When toughener too high levels, the scratch resistance of material
Can be low, when the toughener is above-mentioned content, the polypropylene material of gained not only has preferable scratch resistant performance, but also with preferable
Toughness.
As the more preferable embodiment of scratch-resistant polypropylene composition of the present invention, the toughener is 15 weight
Part.When especially toughener is matched using above-mentioned content, the polypropylene material scratch resistant performance and toughness of gained can reach compared with
For ideal effect.
As the more preferable embodiment of scratch-resistant polypropylene composition of the present invention, the filler is 5~20 weight
Part.When filer content is too low, the rigidity of polypropylene material is low, and when filer content is excessively high, the scratch resistant performance of material is low, institute
It states when filler is said ratio and not only can guarantee the scratch resistant performance of polypropylene material, but also can have preferable rigidity.
As the more preferable embodiment of scratch-resistant polypropylene composition of the present invention, the filler is 10 parts by weight.
The scratch resistant performance of polypropylene material and rigidity can achieve the effect that ideal when the filler is said ratio.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the toughener is ethylene-propylene
At least one of copolymer, ethylene-butene copolymer and ethylene-octene copolymer elastomer.
At 190 DEG C, 2.16Kg is negative for the ethylene-propylene copolymer, ethylene-butene copolymer and ethylene-octene copolymer
Under lotus, melt mass flow rate (MFR) is 0.2~30g/10min.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the filler is inorganic filler；Institute
It is at least one of talcum powder, calcium carbonate, wollastonite, whisker, glass fibre and montmorillonite to state inorganic filler；The pigment is
Carbon black.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the auxiliary agent is that antioxidant and light are steady
Determine agent.
As the preferred embodiment of scratch-resistant polypropylene composition of the present invention, the antioxidant is anti-for Hinered phenols
Oxygen agent and/or phosphite ester kind antioxidant；The light stabilizer is hindered amine light stabilizer.
The antioxidant can be antioxidant 1010, antioxidant 1076, antioxidant 3114, antioxidant 168,
At least one of antioxidant PEP-36.
The light stabilizer can be light stabilizer UV-3808PP5, light stabilizer LA-402XP, light stabilizer LA-
At least one of 402AF.
Another object of the present invention, which also resides in, provides a kind of preparation method of the scratch-resistant polypropylene composition, described resistance to
Scratch polypropene composition preparation method be：Acrylic resin, toughener, damage resistant agent, filler, pigment and auxiliary agent are mixed
It is added twin-screw extrude after uniformly, carries out melting mixing, melting mixing temperature is 170~220 DEG C, screw speed 350
~450 revs/min, extruding pelletization obtains scratch-resistant polypropylene composition.
The beneficial effects of the present invention are：It is of the present invention resistance to the present invention provides a kind of scratch-resistant polypropylene composition
Polypropene composition is scratched to has the following advantages：
1) scratch-resistant polypropylene composition is damage resistant agent by selecting vinyl peroxide grafted object, reduces table
Face friction coefficient, improves the scratch resistant performance of polypropylene material, and will not it is tacky, scratch resistant performance is permanent, to the mechanics of materials
It can not influence；
2) scratch-resistant polypropylene composition has excellent long-term scratch resistant performance, low tacky and strong mechanical performance
Characteristic；
3) scratch-resistant polypropylene composition can be used for preparing inner and outer decorative parts of automobile, improve scratch resistant performance, keep system
Part is beautiful.
Specific implementation mode
To better illustrate the object, technical solutions and advantages of the present invention, below in conjunction with specific embodiment to the present invention
It is described further.
Raw material in the embodiment of the present invention is all from commercially available.The MFR=60g/10min of acrylic resin in embodiment；Second
The MFR=9.1g/10min of alkene-propylene copolymer；The MFR=1.2g/10min of ethylene-butene copolymer；Ethylene-octene is copolymerized
The MFR=1.0g/10min of object.
Embodiment 1
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 2
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 3
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 4
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 5
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 6
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 1.
Embodiment 7
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 8
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 9
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 10
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 11
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 12
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 13
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 14
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 15
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Embodiment 16
A kind of embodiment of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in the present embodiment
The composition of object is shown in Table 2.
Comparative example 1
A kind of comparative example of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in this comparative example
The composition of object is shown in Table 1.
Comparative example 2
A kind of comparative example of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in this comparative example
The composition of object is shown in Table 1.
Comparative example 3
A kind of comparative example of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in this comparative example
The composition of object is shown in Table 1.
Comparative example 4
A kind of comparative example of scratch-resistant polypropylene composition of the present invention, scratch-resistant polypropylene combination described in this comparative example
The composition of object is shown in Table 1.
The composition of 1~4 polypropene composition of 1 Examples 1 to 6 of table and comparative example
The composition of 2 embodiment of table, 7~16 scratch-resistant polypropylene composition
Embodiment 16
1~15 scratch-resistant polypropylene composition of embodiment and 1~4 polypropene composition of comparative example are prepared into
Polypropylene material, preparation method are：After mixing by acrylic resin, toughener, damage resistant agent, filler, pigment and auxiliary agent
It adds twin-screw extrude, carries out melting mixing, melting mixing temperature is 170~220 DEG C, and screw speed is 350~450
Rev/min, extruding pelletization obtains polypropylene material.
To polypropylene material injection molding model made from embodiment 1~15 and comparative example 1~4 carry out scratch resistant performance test,
Simply supported beam notch impact strength and tacky grade, performance test methods are as follows：
(1) scratch resistant performance：It is tested according to ISO19252；
(2) simply supported beam notch impact strength：It is tested according to ISO180；
(3) tacky test：It is tested according to PV3952.
It tests obtained performance parameter and is shown in Table 3 and table 4.
The performance test results of 1~4 polypropene composition of 3 Examples 1 to 6 of table and comparative example
The performance test results of 4 embodiment of table, 7~16 polypropene composition
From table 3 and table 4 as can be seen that it for 0.5~1.5% vinyl peroxide grafted object is scratch-resistant to use grafting rate
Hinder agent, modified obtained polypropylene material is with the scratch resistant performance after good initial and heat ageing, higher impact strength
With low tacky excellent properties.
In table 3 and table 4, the additive amount with damage resistant agent is can be seen that from the comparison of Examples 1 to 6 and comparative example 1,2
Increase, scratch resistant performance is gradually increased, and shock resistance continuously decreases, and the damage resistant agent is in the scratch-resistant polypropylene group
When weight percentage in conjunction object is 1.5~6%, preferable scratch resistant performance and shock resistance can be reached (when poly- third
The scuffing performance △ L of alkene material<1.5, simply supported beam notch impact strength >=30 can be with preferable anti-when tacky grade≤1
While scratching performance, there is preferable mechanical property, and will not be tacky.).When the additive amount of damage resistant agent increases to damage resistant
When weight percentage in polypropene composition is 3%, with the increase of damage resistant agent, the effect increase of damage resistant is unknown
It is aobvious, but shock resistance declines obviously.Vinyl peroxide is can be seen that from the test result of embodiment 4,7~12 to connect
The grafting rate of graft copolymer has a certain impact to the shock resistance of polypropylene material, as vinyl peroxide grafted is total
The shock resistance of the increase of the grafting rate of polymers, polypropylene material continuously decreases, and scratch resistant performance increases, but grafting rate mistake
Height, scratch resistant performance reduce, therefore when grafting rate be 0.5~1.5% when scratch resistant performance and shock resistance can meet
It is required that especially when grafting rate is 0.7~1.2%, scratch resistant performance and shock resistance are higher.When vinyl peroxidating
When the grafting rate of graft copolymers object increases to 1.0%, with the increase of the grafting rate of vinyl peroxide grafted copolymer,
Scratch resistant performance reduces, and when the grafting rate of vinyl peroxide grafted copolymer is 1.0%, scratch resistant performance is best, this
When also have preferable shock resistance.It can be seen that from the test result of embodiment 4 and comparative example 3,4 using institute of the present invention
Scratch resistant performance and the impact strength performance for stating the polypropylene material of vinyl peroxide grafted copolymer are more excellent, and
Tacky lower grade.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is protected to the present invention
The limitation of range is protected, although being explained in detail to the present invention with reference to preferred embodiment, those skilled in the art should
Understand, technical scheme of the present invention can be modified or replaced equivalently, without departing from the essence of technical solution of the present invention
And range.
Claims (10)
1. a kind of scratch-resistant polypropylene composition, which is characterized in that including following parts by weight of component：40~80 parts of acrylic resin
With 1~7 part of damage resistant agent；The damage resistant agent is vinyl peroxide grafted copolymer.
2. scratch-resistant polypropylene composition as described in claim 1, which is characterized in that the vinyl peroxide grafted copolymerization
The grafting rate of object is 0.5~1.5%；Preferably, the grafting rate of the vinyl peroxide grafted copolymer be 0.7~
1.2%；It is highly preferred that the grafting rate of the vinyl peroxide grafted copolymer is 1.0%.
3. scratch-resistant polypropylene composition as claimed in claim 1 or 2, which is characterized in that the scratch-resistant polypropylene composition
It also include following parts by weight of component：0.2~1 part of 0~30 part of toughener, 0~30 part of filler, 0.5~1 part of pigment and auxiliary agent.
4. scratch-resistant polypropylene composition as described in claim 1, which is characterized in that the damage resistant agent is poly- in the damage resistant
Weight percentage in propylene compositions is 1.5~6%；Preferably, scratch-resistant polypropylene described in the damage resistant agent combines
Weight percentage in object is 2~4%；It is highly preferred that the damage resistant agent is in the scratch-resistant polypropylene composition
Weight percentage is 3%.
5. scratch-resistant polypropylene composition as claimed in claim 3, which is characterized in that the toughener is 10~20 parts by weight；
Preferably, the toughener is 15 parts by weight.
6. scratch-resistant polypropylene composition as claimed in claim 3, which is characterized in that the filler is 5~20 parts by weight；It is preferred that
Ground, the filler are 10 parts by weight.
7. scratch-resistant polypropylene composition as claimed in claim 3, which is characterized in that the toughener is ethylene-propylene copolymer
At least one of object, ethylene-butene copolymer and ethylene-octene copolymer elastomer.
8. scratch-resistant polypropylene composition as claimed in claim 3, which is characterized in that the filler is inorganic filler；The nothing
Machine filler is at least one of talcum powder, calcium carbonate, wollastonite, whisker, glass fibre and montmorillonite；The pigment is charcoal
It is black.
9. scratch-resistant polypropylene composition as claimed in claim 3, which is characterized in that the auxiliary agent is that antioxidant and light are stablized
Agent.
10. scratch-resistant polypropylene composition as claimed in claim 9, which is characterized in that the antioxidant is Hinered phenols antioxygen
Agent and/or phosphite ester kind antioxidant；The light stabilizer is hindered amine light stabilizer.
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| CN201810227582.5A CN108456363A (en) | 2018-03-19 | 2018-03-19 | A kind of scratch-resistant polypropylene composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110922679A (en) * | 2019-11-14 | 2020-03-27 | 中广核俊尔（上海）新材料有限公司 | Scratch-resistant and light-aging-resistant polypropylene material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382373A (en) * | 2011-09-22 | 2012-03-21 | 金发科技股份有限公司 | Scratching-resistant and stress-whitening prevention polypropylene compound and preparation method |
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2018
- 2018-03-19 CN CN201810227582.5A patent/CN108456363A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382373A (en) * | 2011-09-22 | 2012-03-21 | 金发科技股份有限公司 | Scratching-resistant and stress-whitening prevention polypropylene compound and preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110922679A (en) * | 2019-11-14 | 2020-03-27 | 中广核俊尔（上海）新材料有限公司 | Scratch-resistant and light-aging-resistant polypropylene material and preparation method thereof |
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Application publication date: 20180828 |