CN103483689B - A kind of preparation method of modified polypropylene composite material - Google Patents
A kind of preparation method of modified polypropylene composite material Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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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
- C08L23/14—Copolymers of propene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92561—Time, e.g. start, termination, duration or interruption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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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
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Abstract
The invention discloses a kind of preparation method of modified polypropylene composite material: get out various raw material according to weight percent composition; In homogenizer, first drop into halogen-free flame retardants, then drop into coupling agent, stir, then drop into stearic acid, stir, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir, obtain mixture; Mixture is sent in twin screw extruder and extrudes, obtain extruded product; The extruded product obtained is cooled in cooling trough; Granulation is carried out to cooled extruded product.Preparation method's technique of the present invention is simple, the modified polypropylene composite material prepared has good weathering resistance, flame retardant resistance, toughness, rigidity and scratch-proofness, long service life, the feature of environmental protection meets RoHS standard-required, meet low smoke and zero halogen environmental requirement simultaneously, can blowing processing be carried out, be applicable to produce various trolley part, electrical component etc., be particularly useful for producing outdoor seat platform and see chair.
Description
Technical field
The invention belongs to thermoplastic macromolecule material technical field, be specifically related to a kind of preparation method of modified polypropylene composite material.
Background technology
Polypropylene (PP) is as one of three large general-purpose plastics, the premium properties such as have that nontoxic, density is light, easily processing, resistance to chemical attack, electrical insulating property are good, is widely used in the numerous areas such as daily living article, electronic apparatus, traffic, electromechanics and building materials.But PP belongs to inflammable material, its oxygen index (L0I) only has 17.4 ~ 18.5, produces a large amount of molten drops very easily propagating flame during burning, and this is restricted with regard to making PP application in a lot of fields.Fire-retardant to PP, the past often adopts halogen containing flame-retardant.Although this based flame retardant addition is few, flame retardant effect is remarkable, producing more smog and poisonous, corrosive gases, causing secondary pollution when burning.Perfect along with environmental protection and health regulation, the developed country such as American-European has started to prohibit the use Halogen, phosphorus and heavy metal fire retardant at present.Halogen-free flame retardants that is nontoxic, that press down cigarette and environmental protection replaces halogen containing flame-retardant gradually will become main flow.Particularly 2005 European Union " about prohibitting the use some Hazardous Substances Directive in electronic electric equipment " appearance, more accelerate the development process of halogen-free flame retardants.Halogen-free flame retardants is mainly based on phosphorus series compound and metal hydroxides.This two compounds burning time non-volatile, do not produce corrosive gases, be called as nuisanceless fire retardant, obtain deep research and widespread use abroad.
Weathering modified polypropylene material is because polypropylene contains unstable tertiary carbon group, after light, heat, oxygen effect, easily degradation with aging occurs and causes the problem such as variable color, strength degradation, thus limits its application out of doors on goods.Therefore, by carrying out weather-proof modification to polypropylene, the work-ing life of polypropylene material out of doors under adverse weather condition can be increased substantially.
The present invention is directed to above-mentioned situation, the Novel polypropylene developing a kind of low smoke and zero halogen weather-proof is material modified, can meet the requirement of various outdoor polypropylene articles material.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, provides a kind of preparation method of modified polypropylene composite material.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of preparation method of modified polypropylene composite material, comprises the following steps:
1) various raw material is got out according to the weight percent composition of Co-polypropylene 60 ~ 80%, toughner 2 ~ 10%, maleic anhydride inoculated polypropylene 1 ~ 10%, coupling agent 0.1 ~ 2%, halogen-free flame retardants 5 ~ 30%, photostabilizer 0.2 ~ 2%, stearic acid 1 ~ 2%;
2) in homogenizer, first halogen-free flame retardants is dropped into, drop into coupling agent again, 2 ~ 5min is stirred with the stirring velocity of 400 ~ 600rpm, then stearic acid is dropped into, 2 ~ 5min is stirred with the stirring velocity of 650 ~ 1400rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 3 ~ 7min with the stirring velocity of 400 ~ 600rpm, obtain the mixture stirred;
3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 300 ~ 450r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product;
4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature;
5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 400 ~ 600rpm, namely obtain the pellet of modified polypropylene composite material.
Adopt step 2) order of addition(of ingredients) and stirring technique after, first coupled dose of halogen-free flame retardants is abundant coated, then again coated by stearic acid, improve flame retardant resistance and halogen-free flame retardants and the polyacrylic consistency of copolymerization, reduce the impact on photostabilizer, the light stabilising effect of photostabilizer is played, ensure that the weathering resistance of modified polypropylene composite material; Stearic acid can also form the buffer substance between halogen-free flame retardants and photostabilizer together with coupling agent, improves flame retardant resistance and the light stability of obtained modified polypropylene composite material simultaneously.
In step 3), if extrusion temperature is low, material mixing melting in twin screw extruder is bad, very easily forms the dispersion of each composition uneven; Extrusion temperature is high, can destroy the performance of various material, therefore controls extrusion temperature at 185 ~ 201 DEG C.
In step 4), if the temperature of water coolant is low, otch during follow-up pelletizing can turn white, and material grain is frangible, produces chip; The temperature of water coolant is high, and easily the company's of causing grain and clay phenomenon, therefore control the water temperature in cooling trough at 45 ~ 65 DEG C.
Preferably, described toughner is polyolefin elastomer.The toughening effect of polyolefin elastomer is better, makes the modified polypropylene composite material that obtains still can keep good mechanical property at the low temperature of-40 DEG C.
Preferably, the graft(ing) degree of described maleic anhydride inoculated polypropylene is 8 ~ 20%.When graft(ing) degree reaches 8 ~ 20%, the effect that maleic anhydride inoculated polypropylene improves halogen-free flame retardants and the polyacrylic consistency of copolymerization is better, makes the modified polypropylene composite material obtained keep original physical property of Co-polypropylene to greatest extent.
Preferably, described coupling agent is γ-methacryloxypropyl trimethoxy silane.γ-methacryloxypropyl trimethoxy silane can coated halogen-free flame retardants well, improve halogen-free flame retardants and the polyacrylic consistency of copolymerization, reduce the impact on photostabilizer, the light stabilising effect of photostabilizer is played, ensure that the weathering resistance of obtained modified polypropylene composite material.
Preferably, described halogen-free flame retardants is made up of ammonium polyphosphate, trimeric cyanamide or melamine polyphosphate, tetramethylolmethane and organo montmorillonite.Poisonous corrosive gases can not be produced during halogen-free flame retardants burning, avoid the harm to HUMAN HEALTH and environment, meet the standard of European Union RoHS, meet Low-smoke halogen-free environment-friendlyflame-retardant flame-retardant requirement.Halogen-free flame retardants after composite substantially increases the flame retardant resistance of obtained modified polypropylene composite material, can meet the blowing requirement of acrylic plastering simultaneously, reduce costs.
Preferably, the mass ratio of ammonium polyphosphate, trimeric cyanamide or melamine polyphosphate, tetramethylolmethane and organo montmorillonite is 2 ~ 6:1 ~ 4:1 ~ 3:0.2 ~ 0.6.Control ammonium polyphosphate, trimeric cyanamide or melamine polyphosphate, tetramethylolmethane and organo montmorillonite mass ratio within the scope of this, while reaching good flame retardant effect, reduce further cost.
Preferably, described photostabilizer is poly-{ (6-morpholinyl-5-triazine-2,4-bis-base) (2,2,6,6-tetramethyl-piperidyl) imido grpup hexa-methylene [(2,2,6,6-tetramethyl-piperidyl)-imido grpup], its molecular formula is (C
31h
56n
8o) n, No. CAS is 82451-48-7.This photostabilizer is aggretion type high molecular weight hindered amine light stabilizer, and containing hindered amine group and triazine group, light stabilising effect is excellent, can improve weathering resistance and the work-ing life of modified polypropylene composite material.
Compared with prior art, the invention has the advantages that: preparation method's technique of the present invention is simple, and existing general-purpose equipment can meet preparation requirement, and cost is low, need not carry out scrap build; During preparation, first coupled dose of halogen-free flame retardants is abundant coated, then again coated by stearic acid, coated by secondary, not only strengthen flame retardant resistance, and the flame retardant resistance of halogen-free flame retardants effectively can be ensured in the course of processing, secondary is coated effectively by halogen-free flame retardants and photostabilizer isolation in addition, avoids halogen-free flame retardants and contacts with the direct of photostabilizer, avoid the disadvantageous effect of halogen-free flame retardants to photostabilizer, improve the weathering resistance of modified polypropylene composite material of the present invention.Therefore, the modified polypropylene composite material adopting the inventive method to prepare has good weathering resistance, flame retardant resistance, toughness, rigidity and scratch-proofness, long service life, the feature of environmental protection meets RoHS standard-required, meet low smoke and zero halogen environmental requirement simultaneously, can blowing processing be carried out, be applicable to produce various trolley part, electrical component etc., be particularly useful for producing outdoor seat platform and see chair.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1: according to Co-polypropylene 65%, polyolefin elastomer 6%, maleic anhydride inoculated polypropylene 6%, γ-methacryloxypropyl trimethoxy silane 0.5%, ammonium polyphosphate 10%, trimeric cyanamide 5%, tetramethylolmethane 5%, organo montmorillonite 1%, No. CAS is the photostabilizer 0.5% of 82451-48-7, and the weight percent composition of stearic acid 1% gets out various raw material; First halogen-free flame retardants is dropped in homogenizer, drop into coupling agent again, 5min is stirred with the stirring velocity of 600rpm, then stearic acid is dropped into, 5min is stirred with the stirring velocity of 1400rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 6min with the stirring velocity of 600rpm, obtain the mixture stirred; 3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 300r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product; 4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature; 5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 400rpm, namely obtain the pellet of the modified polypropylene composite material of embodiment 1.
Embodiment 2: according to Co-polypropylene 60%, polyolefin elastomer 4%, maleic anhydride inoculated polypropylene 5%, γ-methacryloxypropyl trimethoxy silane 0.3%, ammonium polyphosphate 14%, trimeric cyanamide 7.5%, tetramethylolmethane 6.5%, organo montmorillonite 1.3%, No. CAS is the photostabilizer 0.2% of 82451-48-7, and the weight percent composition of stearic acid 1.2% gets out various raw material; First halogen-free flame retardants is dropped in homogenizer, drop into coupling agent again, 5min is stirred with the stirring velocity of 550rpm, then stearic acid is dropped into, 5min is stirred with the stirring velocity of 1200rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 7min with the stirring velocity of 500rpm, obtain the mixture stirred; 3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 350r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product; 4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature; 5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 550rpm, namely obtain the pellet of the modified polypropylene composite material of embodiment 2.
Embodiment 3: according to Co-polypropylene 70%, polyolefin elastomer 8%, maleic anhydride inoculated polypropylene 8%, γ-methacryloxypropyl trimethoxy silane 1.0%, ammonium polyphosphate 4.5%, trimeric cyanamide 2.7%, tetramethylolmethane 2.3%, organo montmorillonite 0.3%, No. CAS is the photostabilizer 1.5% of 82451-48-7, and the weight percent composition of stearic acid 1.7% gets out various raw material; First halogen-free flame retardants is dropped in homogenizer, drop into coupling agent again, 4min is stirred with the stirring velocity of 400rpm, then stearic acid is dropped into, 5min is stirred with the stirring velocity of 650rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 6min with the stirring velocity of 400rpm, obtain the mixture stirred; 3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 450r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product; 4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature; 5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 600rpm, namely obtain the pellet of the modified polypropylene composite material of embodiment 3.
Embodiment 4: according to Co-polypropylene 77%, polyolefin elastomer 2%, maleic anhydride inoculated polypropylene 3%, γ-methacryloxypropyl trimethoxy silane 1.6%, ammonium polyphosphate 5.8%, trimeric cyanamide 3.4%, tetramethylolmethane 2.9%, organo montmorillonite 0.5%, No. CAS is the photostabilizer 1.8% of 82451-48-7, and the weight percent composition of stearic acid 2% gets out various raw material; First halogen-free flame retardants is dropped in homogenizer, drop into coupling agent again, 3min is stirred with the stirring velocity of 580rpm, then stearic acid is dropped into, 4min is stirred with the stirring velocity of 1000rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 7min with the stirring velocity of 550rpm, obtain the mixture stirred; 3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 420r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product; 4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature; 5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 580rpm, namely obtain the pellet of the modified polypropylene composite material of embodiment 4.
In above specific embodiment, polyolefin elastomer can be the toughner product of DF740 for the marque of Mitsui manufacture, its density is 870g/cm3, and fusing point is 59 DEG C, and surface hardness shoreA is 73, the melting index of 190 DEG C is 3.6g/10min, Vicat softening point is 48 DEG C, embrittlement temperature <-70 DEG C, breaking tenacity >10Mpa, extension at break >800%, torsion rigidity is 3Mpa.
Performance test is carried out to the modified polypropylene composite material pellet that above-described embodiment 1 ~ 4 obtains.Carry out weathering test according to ISO4582-2007 " plastics are exposed to the mensuration through color change and performance variation after the daylight of glass, weathering or laboratory light source " method, its 3000 hours aberration are less than 1; Test flame retardant resistance according to UL94-1996REV.9:2009 " equipment and the flammable test of device component plastic material ", its flame retardant rating reaches V0 level, and the feature of environmental protection meets RoHS standard-required.
For the modified polypropylene composite material pellet obtained in above embodiment 1 ~ embodiment 4, GB GB/T1843-2008 " plastics izodtest method " is adopted to test Izod notched impact strength performance, GB GB/T1634-2004 " plastics bending load heat-drawn wire test method " is adopted to test heat-drawn wire performance, GB GB/T1040-2006 " plastic tensile test method " is adopted to test tensile strength, elongation at break properties, GB9341-2008 " Plastics-Oetermination of flexural properties method " is adopted to test flexural strength and modulus in flexure, its performance test results is in table 1.Visible, polypropylene composite material provided by the invention has higher rigidity, intensity and toughness.
The performance test results of table 1 embodiment 1 ~ embodiment 4 polypropylene composite material
Claims (4)
1. a preparation method for modified polypropylene composite material, is characterized in that comprising the following steps:
1) various raw material is got out according to the weight percent composition of Co-polypropylene 60 ~ 80%, toughner 2 ~ 10%, maleic anhydride inoculated polypropylene 1 ~ 10%, coupling agent 0.1 ~ 2%, halogen-free flame retardants 5 ~ 30%, photostabilizer 0.2 ~ 2%, stearic acid 1 ~ 2%; Wherein, the graft(ing) degree of described maleic anhydride inoculated polypropylene is 8 ~ 20%, described coupling agent is γ-methacryloxypropyl trimethoxy silane, and described halogen-free flame retardants is made up of ammonium polyphosphate, trimeric cyanamide or melamine polyphosphate, tetramethylolmethane and organo montmorillonite;
2) in homogenizer, first halogen-free flame retardants is dropped into, drop into coupling agent again, 2 ~ 5min is stirred with the stirring velocity of 400 ~ 600rpm, then stearic acid is dropped into, 2 ~ 5min is stirred with the stirring velocity of 650 ~ 1400rpm, finally drop into Co-polypropylene, photostabilizer, toughner and maleic anhydride inoculated polypropylene, stir 3 ~ 7min with the stirring velocity of 400 ~ 600rpm, obtain the mixture stirred;
3) said mixture material being sent into rotating speed is extrude in the twin screw extruder of 300 ~ 450r/min, and extrusion temperature is 185 ~ 201 DEG C, obtains extruded product;
4) to extruded product obtained above be cool in the cooling trough of 45 ~ 65 DEG C in water temperature;
5) granulation is carried out to the dicing machine that cooled extruded product employing rotating speed is 400 ~ 600rpm, namely obtain the pellet of modified polypropylene composite material.
2. preparation method according to claim 1, is characterized in that described toughner is polyolefin elastomer.
3. preparation method according to claim 1, is characterized in that ammonium polyphosphate, trimeric cyanamide or melamine polyphosphate, the mass ratio of tetramethylolmethane and organo montmorillonite is 2 ~ 6:1 ~ 4:1 ~ 3:0.2 ~ 0.6.
4. preparation method according to claim 1, it is characterized in that described photostabilizer is for poly-{ (6-morpholinyl-5-triazine-2,4-bis-base) (2,2,6,6-tetramethyl-piperidyl) imido grpup hexa-methylene [(2,2,6,6-tetramethyl-piperidyl)-imido grpup], its molecular formula is (C
31h
56n
8o) n, No. CAS is 82451-48-7.
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| CN104448560A (en) * | 2014-12-01 | 2015-03-25 | 黑龙江省润特科技有限公司 | Polypropylene halogen-free intumescent flame retardant |
| CN106832570A (en) * | 2016-12-22 | 2017-06-13 | 阜阳市三郁包装材料有限公司 | Modified polypropylene flame redardant foamed board of a kind of hybridized nanometer zinc hydroxyl stannate silica aerogel and preparation method thereof |
| CN110964287A (en) * | 2018-09-30 | 2020-04-07 | 宁波思宏电器工业有限公司 | Modified polypropylene composite material and lamp mesh enclosure |
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| CN103483689A (en) | 2014-01-01 |
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