CN105566744B - A kind of polypropylene self-reinforced composite material and preparation method thereof - Google Patents
A kind of polypropylene self-reinforced composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of polypropylene self-reinforced composite material and preparation method thereof, wherein, this method comprises the following steps：(1) high-melting-point polypropylene and beta crystal-type nucleater are mixed into sandwich layer；(2) low melting point polypropylene is outer layer；(3) sandwich layer and the outer layer co-extrusion modling are obtained into coextrusion polypropylene strap；(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional is obtained after co-extruded sheet is stretched at a slow speed at low temperature through braiding；(5) the coextrusion polypropylene strap and/or the polypropylene fabric are put into mould, then are molded with polypropylene.The present invention adds beta crystal-type nucleater in preparation process, stretches at a slow speed at low temperature, then by simple injection molding forming method, has so both improved the impact flexibility of material, and also retained the tensile strength for even improving material.
Description
Technical field
The present invention relates to a kind of polypropylene self-reinforced composite material and preparation method thereof.
Background technology
For the present invention as one of most important general-purpose plastics, polyacrylic modified enhancing is always researchers' emphasis work
Make.And with the industry products such as industrial expansion, such as in the market, automobile, daily light industry, medicine be required for excellent combination property and
The low polypropylene material of processing cost.Therefore the performance of current polypropylene material is further balanced and improved, is the main of industry
One of problem.And wherein how simultaneously balanced polypropylene mechanical property, while improve polyacrylic tensile strength and impact it is tough
Property is the focus of research work.
Usual way, it is to introduce the second phase, such as rubber, fiber etc. in the plastic, or by introducing nucleator or changing
Become processing method, change polyacrylic crystal formation, form Beta-crystalline polyacrylic, improve the impact flexibility of material.But these methods,
The former needs more second to form the addition of content mostly, and this will significantly improve the processing cost of material；The latter is often notable
Reduce the other valuable mechanical properties of plastics, such as stretch slight, rigidity etc..
In recent years, the material such as polypropylene strap, flat filament turn into researcher concern focus, mainly due to its mechanical property compared with
It is good, while be polypropylene material again, solve glass fibre, carbon fiber, the interface problem of the reinforcing material such as mica.Utilize poly- third
One remarkable advantage of alkene band or TRPP, you can so that the anti-impact of PP composite material is greatly improved
Hit performance.
But most of to use hot-press method on polypropylene flat-filament reinforcing material, in CN201110364455, Shanghai is outstanding
Shi Jie new material research institute, using hot pressing by it is three-layer co-extruded go out polypropylene flat-filament composite together, wherein surface is eutectic
Point material.As industrial and commercial university of China in CN103707583 A researcher using pressure sintering by polypropylene flat-filament along 0/90 degree according to
The Material cladding of secondary superposition together, prepares self-reinforcing composite board.
Material prepared by these methods does not only sensitive to the temperature of hot pressing, while needs the pressure pressurizeed larger, pressurization
Time is accurate, and these all cause processing cost raising, so that existing market application is limited, hinders in the market product
It is born.A kind of and polypropylene self-reinforced composite material and preparation method thereof.
Therefore, how to prepare while toughness reinforcing strengthens, processing temperature is wider and the self-reinforcing of reservation fiber-wall-element model is compound
The preparation method of material needs further to study and find.
The content of the invention
It is an object of the invention to overcome in the prior art processing temperature it is narrow, mechanical property is low, and specifically with enhancing
Body infiltrates incomplete defect, and provides a kind of polypropylene self-reinforced composite material and preparation method thereof.
The invention provides a kind of polypropylene self-reinforced composite material, the polypropylene self-reinforced composite material includes coextrusion
Polypropylene strap and/or polypropylene fabric and polypropylene, and the polypropylene be coated on it is described coextrusion polypropylene strap and/
Or the outside of the polypropylene fabric；And the polypropylene is low melting point polypropylene；And
The polypropylene fabric for coextrusion polypropylene strap at low temperature at a slow speed stretch after through weave obtain plain weave, tiltedly
The braided material of line, satin weave or three-dimensional, and the coextrusion polypropylene strap includes outer layer and sandwich layer, the outer layer is low melting point
Polypropylene, the sandwich layer contain high-melting-point polypropylene and beta crystal-type nucleater.
Present invention also offers a kind of preparation method of polypropylene self-reinforced composite material, this method comprises the following steps：
(1) high-melting-point polypropylene and beta crystal-type nucleater are mixed as sandwich layer；
(2) using low melting point polypropylene as outer layer；
(3) sandwich layer and the outer layer co-extrusion modling are obtained into coextrusion polypropylene strap；
(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional is obtained after co-extruded sheet is stretched through braiding；
(5) the coextrusion polypropylene strap and/or the polypropylene fabric are put into mould, then carried out with polypropylene
Injection.
The present inventor has found to add β crystalline substances in the preparation process of polypropylene strap by substantial amounts of scientific experiment
Type nucleator, is stretched at a slow speed at low temperature, then by simple injection molding forming method, polypropylene strap and/or polypropylene are compiled
Knit material and be attached to polypropylene matrix surface, so both improved the impact flexibility of material, also retain and even improve material
Tensile strength.In addition, the content of polypropylene fabric is few in composite in the present invention, processing cost is low, to machine-shaping work
Skill influence is very small, easily realizes industrialized production.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The invention provides a kind of polypropylene self-reinforced composite material, wherein, the polypropylene self-reinforced composite material includes
Polypropylene strap and/or polypropylene fabric and polypropylene are coextruded, and the polypropylene is coated on the coextrusion polypropylene
The outside of band and/or the polypropylene fabric；And the polypropylene is low melting point polypropylene；And
The polypropylene fabric for coextrusion polypropylene strap at low temperature at a slow speed stretch after through weave obtain plain weave, tiltedly
The braided material of line, satin weave or three-dimensional, and the coextrusion polypropylene strap includes outer layer and sandwich layer, the outer layer is low melting point
Polypropylene, the sandwich layer contain high-melting-point polypropylene and beta crystal-type nucleater.
According to the present invention, on the basis of the gross weight of the polypropylene self-reinforced composite material, the coextrusion polypropylene
The total content of band and/or the polypropylene fabric can be 2-8wt%, and the polyacrylic content is 92-98wt%；It is preferred that
Ground, the content of the polypropylene fabric is 3-5wt%, and the polypropylene content is 95-97wt%.
According to the present invention, the outer layer of the coextrusion polypropylene strap and the percentage by weight of sandwich layer can be 1：9-19；
Preferably, the outer layer of the coextrusion polypropylene strap and the percentage by weight of sandwich layer are 1：11.5-15.7；That is, phase
Accordingly, if on the basis of the gross weight of the coextrusion polypropylene strap, the outer layer of the coextrusion polypropylene strap
Content can be 5-10 weight %, and the content of the sandwich layer of the coextrusion polypropylene strap can be 90-95 weight, it is preferable that
The content of the outer layer of the coextrusion polypropylene strap is 6-8 weight, and the content of the sandwich layer of the coextrusion polypropylene strap is
92-94 weight.
According to the present invention, on the basis of the sandwich layer of the coextrusion polypropylene strap of 100 parts by weight, the high-melting-point gathers
The content of propylene can be 90-95 parts by weight, and the content of the beta crystal-type nucleater can be 5-10 parts by weight；Preferably, it is described
The polyacrylic content of high-melting-point is 92-94 parts by weight, and the content of the beta crystal-type nucleater is 6-8 parts by weight.
According to the present invention, the low melting point polypropylene can be atactic copolymerized polypropene, and the low melting point is polyacrylic
Fusing point is 130-140 DEG C, and molecular weight Mw is 5 × 105To 1 × 106, molecular weight distribution PD is 3-30；Specifically, in the present invention,
The atactic copolymerized polypropene is not particularly limited, and can be the conventional selection of this area, it is preferable that the random copolymerization poly- third
Alkene is F560EPS or F800E.
According to the present invention, the high-melting-point polypropylene can be isotactic polypropylene, and the polyacrylic fusing point of the high-melting-point
For 160-170 DEG C, molecular size range and molecular weight distribution do not limit specifically, in the present invention, it is preferred to molecular weight Mw be
3.8×105-4×105, molecular weight distribution 5.06-7.35, melt index 2-3.5g/10min；Specifically, in the present invention
In, the isotactic polypropylene is not particularly limited, and can be the conventional selection of this area, it is preferable that the isotactic polypropylene is
F300C or T30S.
According to the present invention, the sandwich layer fusing point of the coextrusion polypropylene strap can be 160-170 DEG C.
According to the present invention, the beta crystal-type nucleater can be aromatic amine nucleator, rare earth compounding class nucleator, quinoline
One or more in quinoline acridine ketone nucleator, fused ring compound class nucleator and compounding nucleator.
According to the present invention, the beta crystal-type nucleater can be 2,6- cyclohexanedimethanols acid amides, N'N- dicyclohexyl -2,
One or more in 6- naphthalenes diamides and composite nucleating agent VP101B；Preferably, the beta crystal-type nucleater is composite nucleating agent
VP101B；Wherein, the composite nucleating agent VP101B contains ultra-fine rubber particles and organic phosphate C29H42O2PNa。
Present invention also offers a kind of preparation method of polypropylene self-reinforced composite material, this method comprises the following steps：
(1) using the mixing of high-melting-point polypropylene and beta crystal-type nucleater as sandwich layer；
(2) it is used as outer layer using low melting point is polyacrylic；
(3) sandwich layer and the outer layer co-extrusion modling are obtained into coextrusion polypropylene strap；
(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional is obtained after co-extruded sheet is stretched through braiding；
(5) the coextrusion polypropylene strap and/or the polypropylene fabric are put into mould, then carried out with polypropylene
Injection.
According to the present invention, in step (3), using it is three-layer co-extruded go out casting machine, add core in two extruders respectively
Layer polypropylene and outer layer polypropylene, extrusion flow casting molding obtain coextrusion polypropylene strap；Wherein, carry out extruding flow casting molding
Condition is not particularly limited, and can be the conventional selection of this area, in the present invention, it is preferred to, carry out extruding flow casting molding
Condition includes：Temperature is 150-200 DEG C, and screw speed is 10rpm-70rpm during extrusion.
According to the present invention, in step (4), coextrusion polypropylene strap is cut out as 10mm-20mm bands first, then
(at low temperature at a slow speed) is redrawn, wherein, the condition of the stretching includes：Temperature is 80-130 DEG C, rate of extension 0.1m/
Min-100m/min, stretching ratio can be 1-16 times；Preferably, the condition of the stretching includes：Temperature is 100 DEG C -120
DEG C, rate of extension 1m/min-10m/min, stretching ratio is 3-15 times.
According to the present invention, in step (5), the condition of the injection includes：Mold temperature is 30-50 DEG C, hot flow path temperature
Spend for 180-220 DEG C, injecting machine material tube and nozzle temperature control are at 160-210 DEG C.
The present invention is described in detail with reference to embodiments.
In following examples, polypropylene be Sinopec Shanghai Chemical Co., Ltd. production F300C, F560EPS and
F800E and Sinopec Maoming Petrochemical T30S, there is no the special raw material emphasized can be directly from city in following examples
Field buying obtains.
Extrusion casting machine is purchased from Labtech Engineering companies, model LMCR-300；
Differential scanning calorimeter is purchased from PerkinEimer companies, model Diamond DSC；
MTS companies of the U.S., the mechanical property of model CMT6104 test articles are purchased from omnipotent test machine；Wherein, according to
The method measurement provided in ISO179.
Embodiment 1
The present embodiment is used for the preparation method for illustrating polypropylene self-reinforced composite material provided by the invention.
Sandwich layer polypropylene：Fusing point is 165 DEG C of high-melting-point polypropylene F300C, wherein, with the co-extrusion of 100 parts by weight
Go out on the basis of the sandwich layer of polypropylene strap, the polyacrylic content of high-melting-point is 94 parts by weight, and the beta crystal-type nucleater contains
Measure as 6 parts by weight；Wherein, the polyacrylic molecular weight Mw of the high-melting-point is 3.8 × 105, PD 5.06, melt index 3.0g/
10min；And the 6wt% beta crystal-type nucleater is composite nucleating agent VP101B；
Outer layer polypropylene：Fusing point is 135 DEG C of low melting point polypropylene F560EPS, and the polyacrylic fusing point of the low melting point originates
Temperature is 130.4 DEG C, and molecular weight Mw is 3.6 × 105, PD 6.4, melt index 3.0g/10min；
Prepare it is three-layer co-extruded go out polypropylene strap：Using it is three-layer co-extruded go out casting machine, added respectively in two extruders
Sandwich layer and outer layer, it is 180 DEG C in temperature, screw speed is under 35rpm, extrudes flow casting molding；Wherein, the coextrusion polypropylene
The outer layer of band and the percentage by weight of sandwich layer are 1：19；
Prepare polypropylene strap：Again by it is three-layer co-extruded go out polypropylene strap temperature be 115 DEG C at, rate of extension 1m/
Min simple tensions to 10 times, and by this it is three-layer co-extruded go out crystalline p p sheet cut out as band wide 10mm, be curled into cylinder；
Injection molding：The polypropylene strap is fixed on cover half, the polypropylene of injection with this it is three-layer co-extruded go out polypropylene
The outer layer raw material of sheet material is identical.Injection machine mould temperature is 50 DEG C, and head temperature is 160 DEG C, dwell pressure 5Mpa, during pressurize
Between be 60s, cool time 10s.
As a result polypropylene self-reinforced composite material F1 provided by the invention is obtained；Wherein, answered with the polypropylene self-reinforcing
On the basis of the gross weight of condensation material, the crystalline p p sheet of the injection is 98 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 2 weights
Measure part.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material F1 impact property reaches
14.5kJ/m2, 195.9% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material F1 tensile strength carries
Height arrives 44.9MPa, and 31.3% is improved relative to matrix material.
Embodiment 2
The present embodiment is used for the preparation method for illustrating polypropylene self-reinforced composite material provided by the invention.
Sandwich layer polypropylene：Beta crystal-type nucleater 2,6- benzene by fusing point for 165 DEG C of high-melting-point polypropylene F300C and 8wt%
Dioctyl phthalate Cyclohexamide be blended, wherein, by 100 parts by weight it is described it is three-layer co-extruded go out polypropylene strap sandwich layer on the basis of, institute
It is 92 parts by weight to state the polyacrylic content of high-melting-point, and the content of the beta crystal-type nucleater is 8 parts by weight；Wherein, the high-melting-point gathers
The molecular weight Mw of propylene is 3.8 × 105, PD 5.06, melt index 3.0g/10min；
Outer layer polypropylene：Fusing point is 135 DEG C of low melting point polypropylene F560EPS, and the polyacrylic fusing point of the low melting point originates
Temperature is 130.4 DEG C, and molecular weight Mw is 3.6 × 105, PD 6.4, melt index 3.0g/10min；
Prepare it is three-layer co-extruded go out polypropylene strap：Using it is three-layer co-extruded go out casting machine, added respectively in two extruders
Sandwich layer polypropylene and outer layer polypropylene, it is 180 DEG C in temperature, screw speed is under 35rpm, extrudes flow casting molding；Wherein, it is described
The percentage by weight of the outer layer and sandwich layer that are coextruded polypropylene strap is 1：9；
Prepare polypropylene fabric：Again by it is three-layer co-extruded go out polypropylene strap temperature be 110 DEG C at, rate of extension 5m/
Min simple tensions to 10 times, and by this it is three-layer co-extruded go out crystalline p p sheet cut out as band wide 10mm, by the side of square crossing
Formula plain weave is together；
Injection molding：The polypropylene strap is fixed on cover half, the polypropylene of injection and the outer layer of the polypropylene fabric
Raw material is identical.Injection machine mould temperature is 45 DEG C, and head temperature is 175 DEG C, dwell pressure 5Mpa, dwell time 60s, cold
But the time is 20s.
As a result polypropylene self-reinforced composite material F2 provided by the invention is obtained；Wherein, answered with the polypropylene self-reinforcing
On the basis of the gross weight of condensation material, the crystalline p p sheet of the injection is 92 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 8 weights
Measure part.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material F2 impact property reaches
15.8kJ/m2, 222.4% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material F2 tensile strength carries
Height arrives 49.5MPa, and 44.7% is improved relative to matrix material.
Embodiment 3
The present embodiment is used for the preparation method for illustrating polypropylene self-reinforced composite material provided by the invention.
Prepare sandwich layer polypropylene：High-melting-point polypropylene T30S and 5wt% that fusing point is 160 DEG C beta crystal-type nucleater is sub
It is well mixed in N'N- dicyclohexyl -2,6- naphthalene diamides homogenizers, wherein, with the described three-layer co-extruded of 100 parts by weight
Go out on the basis of the sandwich layer of polypropylene strap, the polyacrylic content of high-melting-point is 95 parts by weight, and the beta crystal-type nucleater contains
Measure as 5 parts by weight；Wherein, the polyacrylic molecular weight Mw of the high-melting-point is 4.05 × 105, PD 7.35, melt index 3.5g/
10min；
Outer layer polypropylene：Fusing point is 135 DEG C of low melting point polypropylene F800E, and the polyacrylic fusing point starting of the low melting point is warm
Spend for 128.4 DEG C, molecular weight Mw is 3.4 × 105, PD 4.0, melt index 7.5g/10min；
Prepare it is three-layer co-extruded go out polypropylene strap：Using it is three-layer co-extruded go out casting machine, added respectively in two extruders
Sandwich layer polypropylene and outer layer polypropylene, it is 175 DEG C in temperature, screw speed is under 38rpm, extrudes flow casting molding；Wherein, it is described
The percentage by weight of the outer layer and sandwich layer that are coextruded polypropylene strap is 1：19；
Prepare polypropylene fabric：Again by it is three-layer co-extruded go out polypropylene strap temperature be 110 DEG C at, rate of extension is
3m/min simple tensions to 8 times, and by this it is three-layer co-extruded go out crystalline p p sheet cut out as band wide 10mm, by square crossing
Mode plain weave is together；
Injection molding：The polypropylene strap is fixed on cover half, the polypropylene of injection and the outer layer of the polypropylene fabric
Raw material is identical.Injection machine mould temperature is 50 DEG C, and head temperature is 170 DEG C, dwell pressure 5Mpa, dwell time 60s, cold
But the time is 10s.
As a result polypropylene self-reinforced composite material F3 provided by the invention is obtained；Wherein, answered with the polypropylene self-reinforcing
On the basis of the gross weight of condensation material, the crystalline p p sheet of the injection is 95 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 5 weights
Measure part.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material F3 impact property reaches
14.9kJ/m2, 204.8% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material F3 tensile strength carries
Height arrives 47.1MPa, and 37.7% is improved relative to matrix material.
Comparative example 1
Polypropylene self-reinforced composite material is prepared according to method same as Example 1, institute's difference is, is preparing
During sandwich layer is polyacrylic, beta crystal-type nucleater is not added；
As a result polypropylene self-reinforced composite material DF1 is made；Wherein, with the gross weight of the polypropylene self-reinforced composite material
On the basis of amount, the crystalline p p sheet of the injection is 98 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 2 parts by weight.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material DF1 impact property reaches
11.1kJ/m2, 126.5% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material DF1 tensile strength
46.8MPa is brought up to, 36.8% is improved relative to matrix material.
Comparative example 2
Polypropylene self-reinforced composite material is prepared according to method same as Example 1, institute's difference is, is preparing
During polypropylene fabric, temperature be 100 DEG C at, rate of extension be 0.5m/min simple tensions to 8 times,
As a result polypropylene self-reinforced composite material DF2 is made；Wherein, with the gross weight of the polypropylene self-reinforced composite material
On the basis of amount, the crystalline p p sheet of the injection is 95 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 5 parts by weight.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material DF2 impact property reaches
10.3kJ/m2, 110.2% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material DF2 tensile strength
41.8MPa is brought up to, 22.2% is improved relative to matrix material.
Comparative example 3
Polypropylene self-reinforced composite material is prepared according to method same as Example 1, institute's difference is, is being molded
During, injection is not outer layer identical polypropylene with the polypropylene fabric, but F800E；
As a result polypropylene self-reinforced composite material DF3 provided by the invention is obtained；Wherein, answered with the polypropylene self-reinforcing
On the basis of the gross weight of condensation material, the crystalline p p sheet of the injection is 98 parts by weight, it is three-layer co-extruded go out crystalline p p sheet be 2 weights
Measure part.
Tested according to the method provided in ISO179, polypropylene self-reinforced composite material DF3 impact property reaches
7.8kJ/m2, 59.2% is improved relative to matrix material；
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material DF3 tensile strength
39.5MPa is brought up to, 15.5% is improved relative to matrix material.
It can be seen that from above example 1-3 and comparative example 1-3 result：Increased certainly using polypropylene provided by the invention
The preparation method of strong composite, adds beta crystal-type nucleater in preparation process, is tested according to the method provided in ISO179,
Polypropylene self-reinforced composite material F1-F3 prepared by embodiment 1-3 impact property can reach 14.5-15.8kJ/m2, relatively
195.9-222.4% is improved in matrix material；And the polypropylene self-reinforced composite material DF1-DF3 prepared in comparative example 1-3
Impact property can reach 7.8-11.1kJ/m2, 59.2-126.5% is improved relative to matrix material.
Tested according to tensile property testing standard GB-T1040, polypropylene self-reinforced composite material prepared by embodiment 1-3
F1-F3 tensile strength brings up to 44.9-49.5MPa, and 31.3-44.7% is improved relative to matrix material；And comparative example 1-3
The polypropylene self-reinforced composite material DF1-DF3 of middle preparation tensile strength brings up to 39.5-46.8MPa, relative to matrix material
Material improves 15.5-36.8%.
Therefore, stretched at a slow speed at low temperature using provided by the invention, then by simple injection molding forming method, by poly- third
Alkene band or polypropylene woven material are attached to polypropylene matrix surface, have so both improved the impact flexibility of material, and have also retained
Even improve the tensile strength of material.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (11)
1. a kind of polypropylene self-reinforced composite material, it is characterised in that it is poly- that the polypropylene self-reinforced composite material includes coextrusion
Propylene band and/or polypropylene fabric and polypropylene, and the polypropylene is coated on the coextrusion polypropylene by injection
The outside of band and/or the polypropylene fabric；And the polypropylene is low melting point polypropylene；And
The polypropylene fabric for coextrusion polypropylene strap at low temperature at a slow speed stretch after through weave obtain plain weave, twill,
The braided material of satin weave or three-dimensional, and the coextrusion polypropylene strap includes outer layer and sandwich layer, the outer layer gathers for low melting point
Propylene, the sandwich layer contain high-melting-point polypropylene and beta crystal-type nucleater；
Wherein, the beta crystal-type nucleater is 2,6- cyclohexanedimethanols acid amides, N'N- dicyclohexyl -2,6- naphthalene diamides and answered
One or more in synthetic kernel agent VP101B, the composite nucleating agent VP101B contain ultra-fine rubber particles and organic phosphate
C29H42O2PNa。
2. composite according to claim 1, wherein, using the gross weight of the polypropylene self-reinforced composite material as base
The total content of standard, the coextrusion polypropylene strap and/or the polypropylene fabric is 2-8wt%, and the polyacrylic content is
92-98wt%。
3. composite according to claim 1, wherein, the outer layer polypropylene and sandwich layer of the coextrusion polypropylene strap
Polyacrylic mass percent is 1：9-19.
4. composite according to claim 1, wherein, with the core of the coextrusion polypropylene strap of 100 parts by weight
On the basis of layer, the polyacrylic content of high-melting-point is 90-95 parts by weight, and the content of the beta crystal-type nucleater is 5-10 weight
Part.
5. composite according to claim 1, wherein, the low melting point polypropylene is random polypropylene；The Gao Rong
Point polypropylene is isotactic polypropylene.
6. composite according to claim 1 or 5, wherein, the polyacrylic fusing point of high-melting-point is 160-170 DEG C,
The polyacrylic fusing point of low melting point is 130-140 DEG C.
7. a kind of preparation method of the polypropylene self-reinforced composite material in claim 1-6 described in any one, this method bag
Include following steps：
（1）High-melting-point polypropylene and beta crystal-type nucleater are mixed as sandwich layer；
（2）Using low melting point polypropylene as outer layer；
（3）The sandwich layer and the outer layer co-extrusion modling are obtained into coextrusion polypropylene strap；
（4）After coextrusion polypropylene strap stretching the polypropylene fabric of plain weave, twill, satin weave or three-dimensional will be obtained through braiding；
（5）The coextrusion polypropylene strap and/or the polypropylene fabric are put into mould, then noted with polypropylene
Modeling.
8. the method according to claim 11, wherein, in step（3）In, the condition of the extrusion molding includes：Temperature is
150-200 DEG C, screw speed is 10rpm-70rpm during extrusion.
9. the method according to claim 11, wherein, in step（4）In, the condition of the stretching includes：Temperature is 80-
130 DEG C, rate of extension 0.1m/min-100m/min, stretching ratio is 1-16 times.
10. the method according to claim 11, wherein, in step（4）In, the condition of the stretching includes：Temperature is 100-
120 DEG C, rate of extension 1m/min-10m/min, stretching ratio is 3-15 times.
11. the method according to claim 11, wherein, in step（5）In, the condition of the injection includes：Mold temperature is
30-50 DEG C, hot-fluid channel temp is 180-220 DEG C, and injecting machine material tube and nozzle temperature control are at 160-210 DEG C.
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| CN107972343B (en) * | 2016-10-21 | 2020-07-24 | 中国石油化工股份有限公司 | Polypropylene composite material, polypropylene self-reinforced composite material and preparation method thereof |
| EP3614878B1 (en) | 2017-04-27 | 2024-05-15 | Paua Trading Limited | Protective case or cover |
| CN112318985A (en) * | 2020-11-10 | 2021-02-05 | 烟台正海合泰科技股份有限公司 | Non-woven fabric with glue-blocking film and production method thereof |
| CA3237007A1 (en) * | 2021-11-08 | 2023-05-11 | Liqiu Chu | Polypropylene composite material having melting point gradient structure, preparation method therefor and system and use thereof |
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