CN105566744A - Polypropylene self-reinforced composite and preparation method thereof - Google Patents
Polypropylene self-reinforced composite and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a polypropylene self-reinforced composite and a preparation method thereof, wherein the method comprises the following steps: (1) high melting point polypropylene and a beta crystal form nucleating agent are mixed as a core layer; (2) low melting point polypropylene is used as an outer layer; (3) the core layer and the outer layer are coextruded to obtain a coextruded polypropylene strip; (4) a coextruded polypropylene sheet is slowly stretched at low temperature, and weaved into a plain, twill, satin-line or three-dimensional polypropylene fabric; and (5) the coextruded polypropylene strip and/ or the polypropylene fabric are/ is put into a die, and then polypropylene is used for injection molding. The beta crystal form nucleating agent is added into the production process, by slow stretching at low temperature and a simple injection molding method, the impact toughness of the material is improved, and the tensile strength of the material is kept even improved.
Description
Technical field
The present invention relates to a kind of polypropylene self-reinforced composite material and preparation method thereof.
Background technology
The present invention is as one of most important general-purpose plastics, and it is investigators' major tasks that polyacrylic modification strengthens always.And along with industrial expansion, on market, as automobile, the industry product such as daily light industry, medicine all needs excellent combination property and the low polypropylene material of tooling cost.Therefore balancing and improve the performance of current polypropylene material further, is one of major subjects of industry.And the mechanical property of wherein how simultaneously balanced polypropylene, improve the focus that polyacrylic tensile strength and impelling strength are research work simultaneously.
Usual method introduces second-phase in the plastic, as rubber, and fiber etc., or by introducing nucleator or changing working method, change polyacrylic crystal formation, form Beta-crystalline polyacrylic, improve the impelling strength of material.But these methods, the former needs adding of the second more composition content mostly, and this will significantly improve the tooling cost of material; The latter often reduces other the mechanical property of preciousness of plastics significantly, as slight in stretched, rigidity etc.
In recent years, the material such as polypropylene strap, flat filament becomes the focus that investigator pays close attention to, better mainly due to its mechanical property, is polypropylene material again simultaneously, solves glass fibre, carbon fiber, the interface problem of the strongtheners such as mica.Utilize a remarkable advantage of polypropylene strap or fiber reinforced polypropylene, namely significantly can improve the shock resistance of polypropylene composite material.
But great majority about polypropylene flat-filament strongthener use hot-press method, as in CN201110364455, Shanghai Jie Shijie new material research institute, utilize hot pressing by three-layer co-extruded go out polypropylene flat-filament matrix material together, wherein surface is low melting material.Investigator as industrial and commercial university Chinese in CN103707583A utilizes pressure sintering by polypropylene flat-filament along 0/90 degree of Material cladding superposed successively together, preparation self-enhancement composite sheet.
Material prepared by these methods does not only to the temperature sensitive of hot pressing, and need the pressure of pressurization comparatively large, clamping time is accurate simultaneously, and these all cause tooling cost and improve, thus it is limited that existing market is applied, and hinders the birth of product on market.And a kind of polypropylene self-reinforced composite material and preparation method thereof.
Therefore, how to prepare simultaneously toughen and intensify, the processing temperature preparation method of self-reinforced composite material that is wider and that retain fibre orientation to need research further and finding.
Summary of the invention
The object of the invention is to overcome processing temperature in prior art narrow, mechanical property is low, and concrete and reinforcement 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, this polypropylene self-reinforced composite material comprises coextrusion polypropylene strap and/or polypropylene fabric and polypropylene, and described polypropylene is coated on the outside of described coextrusion polypropylene strap and/or described polypropylene fabric; And described polypropylene is low melting point polypropylene; And
Described polypropylene fabric is through weaving the braided material of the plain weave, twill, satin weave or the three-dimensional that obtain after coextrusion polypropylene strap stretches at a slow speed at low temperatures, and described coextrusion polypropylene strap comprises skin and sandwich layer, described skin is low melting point polypropylene, and described sandwich layer contains high-melting-point polypropylene and beta crystal-type nucleater.
Present invention also offers a kind of preparation method of polypropylene self-reinforced composite material, the method comprises the following steps:
(1) high-melting-point polypropylene and beta crystal-type nucleater are mixed as sandwich layer;
(2) adopt low melting point polypropylene as skin;
(3) described sandwich layer and described outer co-extrusion modling are obtained coextrusion polypropylene strap;
(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional will be obtained after coextrusion sheet material stretching through braiding;
(5) described coextrusion polypropylene strap and/or described polypropylene fabric are put into mould, then carry out injection moulding with polypropylene.
The present inventor is by a large amount of scientific experiments, find to add beta crystal-type nucleater in the preparation process of polypropylene strap, stretch at a slow speed at low temperatures, again by simple injection molding forming method, polypropylene strap and/or polypropylene woven material are attached to polypropylene-base surface, so both improve the impelling strength of material, also retain the tensile strength that even improve material.In addition, in the matrix material in the present invention, the content of polypropylene fabric is few, and tooling cost is low, very little on processing and forming technology impact, easily realizes suitability for industrialized production.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of polypropylene self-reinforced composite material, wherein, this polypropylene self-reinforced composite material comprises coextrusion polypropylene strap and/or polypropylene fabric and polypropylene, and described polypropylene is coated on the outside of described coextrusion polypropylene strap and/or described polypropylene fabric; And described polypropylene is low melting point polypropylene; And
Described polypropylene fabric is through weaving the braided material of the plain weave, twill, satin weave or the three-dimensional that obtain after coextrusion polypropylene strap stretches at a slow speed at low temperatures, and described coextrusion polypropylene strap comprises skin and sandwich layer, described skin is low melting point polypropylene, and described sandwich layer contains high-melting-point polypropylene and beta crystal-type nucleater.
According to the present invention, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the total content of described coextrusion polypropylene strap and/or described polypropylene fabric can be 2-8wt%, and described polyacrylic content is 92-98wt%; Preferably, the content of described polypropylene fabric is 3-5wt%, and described polypropylene content is 95-97wt%.
According to the present invention, the skin of described coextrusion polypropylene strap and the weight percent of sandwich layer can be 1:9-19; Preferably, the skin of described coextrusion polypropylene strap and the weight percent of sandwich layer are 1:11.5-15.7; That is, accordingly, if with the gross weight of described coextrusion polypropylene strap for benchmark, the outer field content of described coextrusion polypropylene strap can be 5-10 % by weight, the content of the sandwich layer of described coextrusion polypropylene strap can be 90-95 weight, preferably, the outer field content of described coextrusion polypropylene strap is 6-8 weight, and the content of the sandwich layer of described coextrusion polypropylene strap is 92-94 weight.
According to the present invention, with the sandwich layer of the described coextrusion polypropylene strap of 100 weight parts for benchmark, the polyacrylic content of described high-melting-point can be 90-95 weight part, and the content of described beta crystal-type nucleater can be 5-10 weight part; Preferably, the polyacrylic content of described high-melting-point is 92-94 weight part, and the content of described beta crystal-type nucleater is 6-8 weight part.
According to the present invention, described low melting point polypropylene can be atactic copolymerized polypropene, and the polyacrylic fusing point of described low melting point is 130-140 DEG C, and molecular weight Mw is 5 × 10
5to 1 × 10
6, molecular weight distribution PD is 3-30; Particularly, in the present invention, described atactic copolymerized polypropene is not particularly limited, and can be that the routine of this area is selected, preferably, described atactic copolymerized polypropene be F560EPS or F800E.
According to the present invention, described high-melting-point polypropylene can be isotatic polypropylene, and the polyacrylic fusing point of described high-melting-point is 160-170 DEG C, and molecular size range and molecular weight distribution do not have concrete restriction, and in the present invention, preferred molecular weight Mw is 3.8 × 10
5-4 × 10
5, molecular weight distribution is 5.06-7.35, and melting index is 2-3.5g/10min; Particularly, in the present invention, described isotatic polypropylene is not particularly limited, and can be that the routine of this area is selected, preferably, described isotatic polypropylene be F300C or T30S.
According to the present invention, the sandwich layer fusing point of described coextrusion polypropylene strap can be 160-170 DEG C.
According to the present invention, described beta crystal-type nucleater can be one or more in aromatic amine nucleator, rare earth compounding class nucleator, quinoline acridine ketone nucleator, fused ring compound class nucleator and composite nucleator.
According to the present invention, described beta crystal-type nucleater can be one or more in 2,6-cyclohexanedimethanol acid amides, N'N-dicyclohexyl-2,6-naphthalene diamide and composite nucleating agent VP101B; Preferably, described beta crystal-type nucleater is composite nucleating agent VP101B; Wherein, described composite nucleating agent VP101B contains ultra-fine rubber particles and organophosphate C
29h
42o
2pNa.
Present invention also offers a kind of preparation method of polypropylene self-reinforced composite material, the method comprises the following steps:
(1) using the mixing of high-melting-point polypropylene and beta crystal-type nucleater as sandwich layer;
(2) adopt low melting point polyacrylic as outer;
(3) described sandwich layer and described outer co-extrusion modling are obtained coextrusion polypropylene strap;
(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional will be obtained after coextrusion sheet material stretching through braiding;
(5) described coextrusion polypropylene strap and/or described polypropylene fabric are put into mould, then carry out injection moulding with polypropylene.
According to the present invention, in step (3), adopt three-layer co-extruded go out casting machine, in two forcing machines, add sandwich layer polypropylene and outer layer polypropylene respectively, extrude flow casting molding and obtain coextrusion polypropylene strap; Wherein, the condition carrying out extruding flow casting molding is not particularly limited, and can be that the routine of this area is selected, in the present invention, preferably, the condition carrying out extruding flow casting molding comprises: temperature is 150-200 DEG C, and when extruding, screw speed is 10rpm-70rpm.
According to the present invention, in step (4), first coextrusion polypropylene strap is cut out into 10mm-20mm band, and then stretch (at low temperatures at a slow speed), wherein, the condition of described stretching comprises: temperature is 80-130 DEG C, and rate of extension is 0.1m/min-100m/min, and stretching ratio can be 1-16 times; Preferably, the condition of described stretching comprises: temperature is 100 DEG C-120 DEG C, and rate of extension is 1m/min-10m/min, and stretching ratio is 3-15 times.
According to the present invention, in step (5), the condition of described injection moulding comprises: die temperature is 30-50 DEG C, and hot runner temperature is 180-220 DEG C, and injecting machine material tube and nozzle temperature control at 160-210 DEG C.
Below in conjunction with embodiment, the present invention is described in detail.
In following examples, polypropylene is the F300C that Sinopec Shanghai Chemical Co., Ltd. produces, and the T30S of F560EPS and F800E and Sinopec Maoming Petrochemical, does not have the special raw material emphasized directly to obtain from market purchasing in following examples.
Extrude casting machine purchased from LabtechEngineering company, model is LMCR-300;
Differential scanning calorimeter is purchased from PerkinEimer company, and model is DiamondDSC;
With omnipotent test machine purchased from American MTS company, model is the mechanical property of CMT6104 test article; Wherein, measure according to the method provided in ISO179.
Embodiment 1
The present embodiment is for illustration of the preparation method of polypropylene self-reinforced composite material provided by the invention.
Sandwich layer polypropylene: fusing point is the high-melting-point polypropylene F300C of 165 DEG C, wherein, with the sandwich layer of the described coextrusion polypropylene strap of 100 weight parts for benchmark, the polyacrylic content of described high-melting-point is 94 weight parts, and the content of described beta crystal-type nucleater is 6 weight parts; Wherein, the polyacrylic molecular weight Mw of this high-melting-point is 3.8 × 10
5, PD is 5.06, and melting index is 3.0g/10min; And the described beta crystal-type nucleater of 6wt% is composite nucleating agent VP101B;
Outer layer polypropylene: fusing point is the low melting point polypropylene F560EPS of 135 DEG C, and the polyacrylic fusing point starting temperature of this low melting point is 130.4 DEG C, and molecular weight Mw is 3.6 × 10
5, PD is 6.4, and melting index is 3.0g/10min;
Prepare three-layer co-extruded go out polypropylene strap: adopt three-layer co-extruded go out casting machine, in two forcing machines, adding sandwich layer and skin respectively, is 180 DEG C in temperature, and screw speed is under 35rpm, extrudes flow casting molding; Wherein, the skin of described coextrusion polypropylene strap and the weight percent of sandwich layer are 1:19;
Preparation polypropylene strap: again by three-layer co-extruded go out polypropylene strap at temperature is 115 DEG C, rate of extension be 1m/min unilateral stretching to 10 times, and by this three-layer co-extruded go out crystalline p p sheet cut out as the wide band of 10mm, be curled into cylinder;
Injection moulding: this polypropylene strap is fixed on cover half, the polypropylene of injection moulding with this three-layer co-extruded go out the outer raw material of crystalline p p sheet identical.Injection machine mould temperature is 50 DEG C, and head temperature is 160 DEG C, and dwell pressure is 5Mpa, and the dwell time is 60s, and cooling time is 10s.
Result obtains polypropylene self-reinforced composite material F1 provided by the invention; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 98 weight parts, three-layer co-extruded go out crystalline p p sheet be 2 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material F1 reaches 14.5kJ/m
2, improve 195.9% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material F1 brings up to 44.9MPa, improves 31.3% relative to body material.
Embodiment 2
The present embodiment is for illustration of the preparation method of polypropylene self-reinforced composite material provided by the invention.
Sandwich layer polypropylene: the beta crystal-type nucleater 2 by fusing point being high-melting-point polypropylene F300C and the 8wt% of 165 DEG C, 6-cyclohexanedimethanol acid amides is blended, wherein, with 100 weight parts described three-layer co-extruded go out the sandwich layer of polypropylene strap for benchmark, the polyacrylic content of described high-melting-point is 92 weight parts, and the content of described beta crystal-type nucleater is 8 weight parts; Wherein, the polyacrylic molecular weight Mw of this high-melting-point is 3.8 × 10
5, PD is 5.06, and melting index is 3.0g/10min;
Outer layer polypropylene: fusing point is the low melting point polypropylene F560EPS of 135 DEG C, and the polyacrylic fusing point starting temperature of this low melting point is 130.4 DEG C, and molecular weight Mw is 3.6 × 10
5, PD is 6.4, and melting index is 3.0g/10min;
Prepare three-layer co-extruded go out polypropylene strap: adopt three-layer co-extruded go out casting machine, in two forcing machines, adding sandwich layer polypropylene and outer layer polypropylene respectively, is 180 DEG C in temperature, and screw speed is under 35rpm, extrudes flow casting molding; Wherein, the skin of described coextrusion polypropylene strap and the weight percent of sandwich layer are 1:9;
Prepare polypropylene fabric: again by three-layer co-extruded go out polypropylene strap at temperature is 110 DEG C, rate of extension is that 5m/min unilateral stretching is to 10 times, and by this three-layer co-extruded go out crystalline p p sheet cut out as the wide band of 10mm, by square crossing mode plain weave together;
Injection moulding: be fixed on cover half by this polypropylene strap, the polypropylene of injection moulding is identical with the outer raw material of this polypropylene fabric.Injection machine mould temperature is 45 DEG C, and head temperature is 175 DEG C, and dwell pressure is 5Mpa, and the dwell time is 60s, and cooling time is 20s.
Result obtains polypropylene self-reinforced composite material F2 provided by the invention; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 92 weight parts, three-layer co-extruded go out crystalline p p sheet be 8 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material F2 reaches 15.8kJ/m
2, improve 222.4% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material F2 brings up to 49.5MPa, improves 44.7% relative to body material.
Embodiment 3
The present embodiment is for illustration of the preparation method of polypropylene self-reinforced composite material provided by the invention.
Prepare sandwich layer polypropylene: the sub-N'N-dicyclohexyl-2 of beta crystal-type nucleater by fusing point being high-melting-point polypropylene T30S and the 5wt% of 160 DEG C, mix in 6-naphthalene diamide homogenizer, wherein, with 100 weight parts described three-layer co-extruded go out the sandwich layer of polypropylene strap for benchmark, the polyacrylic content of described high-melting-point is 95 weight parts, and the content of described beta crystal-type nucleater is 5 weight parts; Wherein, the polyacrylic molecular weight Mw of this high-melting-point is 4.05 × 10
5, PD is 7.35, and melting index is 3.5g/10min;
Outer layer polypropylene: fusing point is the low melting point polypropylene F800E of 135 DEG C, and the polyacrylic fusing point starting temperature of this low melting point is 128.4 DEG C, and molecular weight Mw is 3.4 × 10
5, PD is 4.0, and melting index is 7.5g/10min;
Prepare three-layer co-extruded go out polypropylene strap: adopt three-layer co-extruded go out casting machine, in two forcing machines, adding sandwich layer polypropylene and outer layer polypropylene respectively, is 175 DEG C in temperature, and screw speed is under 38rpm, extrudes flow casting molding; Wherein, the skin of described coextrusion polypropylene strap and the weight percent of sandwich layer are 1:19;
Prepare polypropylene fabric: again by three-layer co-extruded go out polypropylene strap at being 110 DEG C in temperature, rate of extension is that 3m/min unilateral stretching is to 8 times, and by this three-layer co-extruded go out crystalline p p sheet cut out as the wide band of 10mm, by square crossing mode plain weave together;
Injection moulding: be fixed on cover half by this polypropylene strap, the polypropylene of injection moulding is identical with the outer raw material of this polypropylene fabric.Injection machine mould temperature is 50 DEG C, and head temperature is 170 DEG C, and dwell pressure is 5Mpa, and the dwell time is 60s, and cooling time is 10s.
Result obtains polypropylene self-reinforced composite material F3 provided by the invention; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 95 weight parts, three-layer co-extruded go out crystalline p p sheet be 5 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material F3 reaches 14.9kJ/m
2, improve 204.8% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material F3 brings up to 47.1MPa, improves 37.7% relative to body material.
Comparative example 1
Prepare polypropylene self-reinforced composite material according to the method identical with embodiment 1, institute's difference is, preparing in the polyacrylic process of sandwich layer, does not add beta crystal-type nucleater;
Result obtains polypropylene self-reinforced composite material DF1; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 98 weight parts, three-layer co-extruded go out crystalline p p sheet be 2 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material DF1 reaches 11.1kJ/m
2, improve 126.5% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material DF1 brings up to 46.8MPa, improves 36.8% relative to body material.
Comparative example 2
Prepare polypropylene self-reinforced composite material according to the method identical with embodiment 1, institute's difference is, in the process preparing polypropylene fabric, at temperature is 100 DEG C, rate of extension be 0.5m/min unilateral stretching to 8 times,
Result obtains polypropylene self-reinforced composite material DF2; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 95 weight parts, three-layer co-extruded go out crystalline p p sheet be 5 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material DF2 reaches 10.3kJ/m
2, improve 110.2% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material DF2 brings up to 41.8MPa, improves 22.2% relative to body material.
Comparative example 3
Prepare polypropylene self-reinforced composite material according to the method identical with embodiment 1, institute's difference is, in injection moulding process, injection moulding be not the polypropylene identical with the skin of this polypropylene fabric, but F800E;
Result obtains polypropylene self-reinforced composite material DF3 provided by the invention; Wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the crystalline p p sheet of described injection moulding is 98 weight parts, three-layer co-extruded go out crystalline p p sheet be 2 weight parts.
According to the method test provided in ISO179, the impact property of this polypropylene self-reinforced composite material DF3 reaches 7.8kJ/m
2, improve 59.2% relative to body material;
Test according to tensile property testing standard GB-T1040, the tensile strength of this polypropylene self-reinforced composite material DF3 brings up to 39.5MPa, improves 15.5% relative to body material.
Result as can be seen from above embodiment 1-3 and comparative example 1-3: the preparation method adopting polypropylene self-reinforced composite material provided by the invention, beta crystal-type nucleater is added in preparation process, according to the method test provided in ISO179, the impact property of polypropylene self-reinforced composite material F1-F3 prepared by embodiment 1-3 can reach 14.5-15.8kJ/m
2, improve 195.9-222.4% relative to body material; And the impact property of the polypropylene self-reinforced composite material DF1-DF3 prepared in comparative example 1-3 can reach 7.8-11.1kJ/m
2, improve 59.2-126.5% relative to body material.
Test according to tensile property testing standard GB-T1040, the tensile strength of polypropylene self-reinforced composite material F1-F3 prepared by embodiment 1-3 brings up to 44.9-49.5MPa, improves 31.3-44.7% relative to body material; And the tensile strength of the polypropylene self-reinforced composite material DF1-DF3 prepared in comparative example 1-3 brings up to 39.5-46.8MPa, improve 15.5-36.8% relative to body material.
Therefore, adopt and provided by the inventionly to stretch at a slow speed at low temperatures, then by simple injection molding forming method, polypropylene strap or polypropylene woven material are attached to polypropylene-base surface, so both improve the impelling strength of material, also retain the tensile strength that even improve material.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a polypropylene self-reinforced composite material, it is characterized in that, this polypropylene self-reinforced composite material comprises coextrusion polypropylene strap and/or polypropylene fabric and polypropylene, and described polypropylene is coated on the outside of described coextrusion polypropylene strap and/or described polypropylene fabric; And described polypropylene is low melting point polypropylene; And
Described polypropylene fabric is through weaving the braided material of the plain weave, twill, satin weave or the three-dimensional that obtain after coextrusion polypropylene strap stretches at a slow speed at low temperatures, and described coextrusion polypropylene strap comprises skin and sandwich layer, described skin is low melting point polypropylene, and described sandwich layer contains high-melting-point polypropylene and beta crystal-type nucleater.
2. matrix material according to claim 1, wherein, with the gross weight of described polypropylene self-reinforced composite material for benchmark, the total content of described coextrusion polypropylene strap and/or described polypropylene fabric is 2-8wt%, and described polyacrylic content is 92-98wt%.
3. matrix material according to claim 1, wherein, outer layer polypropylene and the polyacrylic mass percent of sandwich layer of described coextrusion polypropylene strap are 1:9-19.
4. matrix material according to claim 1, wherein, with the sandwich layer of the described coextrusion polypropylene strap of 100 weight parts for benchmark, the polyacrylic content of described high-melting-point is 90-95 weight part, and the content of described beta crystal-type nucleater is 5-10 weight part.
5. matrix material according to claim 1, wherein, described low melting point polypropylene is Atactic Polypropelene; Described high-melting-point polypropylene is isotatic polypropylene.
6. matrix material according to claim 1 or 5, wherein, the polyacrylic fusing point of described high-melting-point is 160-170 DEG C, and the polyacrylic fusing point of described low melting point is 130-140 DEG C.
7. matrix material according to claim 1, wherein, described beta crystal-type nucleater is one or more in aromatic amine nucleator, rare earth compounding class nucleator, quinoline acridine ketone nucleator, fused ring compound class nucleator and composite nucleator.
8. matrix material according to claim 7, wherein, described beta crystal-type nucleater is one or more in 2,6-cyclohexanedimethanol acid amides, N'N-dicyclohexyl-2,6-naphthalene diamide and composite nucleating agent VP101B.
9. a preparation method for the polypropylene self-reinforced composite material in claim 1-8 described in any one, the method comprises the following steps:
(1) high-melting-point polypropylene and beta crystal-type nucleater are mixed as sandwich layer;
(2) adopt low melting point polypropylene as skin;
(3) described core liquid and described outer co-extrusion modling are obtained coextrusion polypropylene strap;
(4) polypropylene fabric of plain weave, twill, satin weave or three-dimensional will be obtained after coextrusion sheet material stretching through braiding;
(5) described coextrusion polypropylene strap and/or described polypropylene fabric are put into mould, then carry out injection moulding with polypropylene.
10. method according to claim 9, wherein, in step (3), the condition of described extrusion moulding comprises: temperature is 150-200 DEG C, and when extruding, screw speed is 10rpm-70rpm.
11. methods according to claim 9, wherein, in step (4), the condition of described stretching comprises: temperature is 80-130 DEG C, and rate of extension is 0.1m/min-100m/min, and stretching ratio is 1-16 times, preferably, temperature is 100-120 DEG C, and rate of extension is 1m/min-10m/min, and stretching ratio is 3-15 times.
12. methods according to claim 9, wherein, in step (5), the condition of described injection moulding comprises: die temperature is 30-50 DEG C, and hot runner temperature is 180-220 DEG C, and injecting machine material tube and nozzle temperature control at 160-210 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US11576473B2 (en) | 2015-10-21 | 2023-02-14 | Paua Trading Limited | Case or cover for hobby equipment |
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| US11576473B2 (en) | 2015-10-21 | 2023-02-14 | Paua Trading Limited | Case or cover for hobby equipment |
| US11931645B2 (en) | 2015-10-21 | 2024-03-19 | Paua Trading Limited | Case or cover for hobby equipment |
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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 |
| US11330877B2 (en) | 2017-04-27 | 2022-05-17 | Paua Trading Limited | Protective case or cover |
| US11350715B2 (en) | 2017-04-27 | 2022-06-07 | Paua Trading Limited | Protective case or cover |
| US11627787B2 (en) | 2017-04-27 | 2023-04-18 | 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 |
| WO2023078441A1 (en) * | 2021-11-08 | 2023-05-11 | 中国石油化工股份有限公司 | Polypropylene composite material having melting point gradient structure, preparation method therefor and system and use thereof |
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