CN106543559B - A kind of preparation method of expanded polypropylene beads - Google Patents

A kind of preparation method of expanded polypropylene beads Download PDF

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CN106543559B
CN106543559B CN201610903870.9A CN201610903870A CN106543559B CN 106543559 B CN106543559 B CN 106543559B CN 201610903870 A CN201610903870 A CN 201610903870A CN 106543559 B CN106543559 B CN 106543559B
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polypropylene
expanded polypropylene
screw extruder
speed
expanded
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CN106543559A (en
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袁瑞建
朱红芳
杨正高
陈钢
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GUANGDONG JUSHI CHEMICAL INDUSTRY Co Ltd
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GUANGDONG JUSHI CHEMICAL INDUSTRY Co Ltd
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/06Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/02Making granules by dividing preformed material
    • B29B9/06Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/12Making granules characterised by structure or composition
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    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122Hydrogen, oxygen, CO2, nitrogen or noble gases
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    • C08K3/34Silicon-containing compounds
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
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    • C08K5/09Carboxylic acids; Metal salts thereof; Anhydrides thereof
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    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/13Phenols; Phenolates
    • C08K5/134Phenols containing ester groups
    • C08K5/1345Carboxylic esters of phenolcarboxylic acids
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions 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
    • C08L23/10Homopolymers or copolymers of propene
    • C08L23/12Polypropene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions 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
    • C08L23/10Homopolymers or copolymers of propene
    • C08L23/14Copolymers of propene
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    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/06CO2, N2 or noble gases
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    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2353/00Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
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    • C08L2203/00Applications
    • C08L2203/14Applications used for foams
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    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Abstract

The invention discloses a kind of preparation methods of expanded polypropylene beads comprising following steps: 1) high-speed mixer is added in acrylic resin, active filler and auxiliary agent, 10~20 DEG C are uniformly mixed, and obtain polypropylene expanded material;2) three-screw extruder is added in polypropylene expanded material, is plasticized and is kneaded, then fills supercritical fluid, control mouth molding pressure is 5~25MPa, and die temperature is 110~160 DEG C, then through mouth mold moment discharge, is foamed, and obtains ultrafine micropore expanded polypropylene;3) ultrafine micropore expanded polypropylene is granulated through die face Water-circulating thermal cutting, is dry, being sieved, and obtains expanded polypropylene beads.Method production cost of the invention is low, production capacity is big, safety and environmental protection, reactive blowing agent decomposes residue in the expanded polypropylene beads of preparation, can second time of foaming, expansion ratio is adjustable, and finished product resilience is high, it easily decomposes and recycles, the fields such as plastics package, transportation, military aerospace and office daily necessities can be widely used in.

Description

A kind of preparation method of expanded polypropylene beads
Technical field
The present invention relates to a kind of preparation methods of expanded polypropylene beads, and in particular to a kind of to use Tri-screw Extrusion mechanism The method of preparation foaming polypropylene bead belongs to polymer foaming technical field.
Background technique
Foamed plastics has many advantages, such as that light, energy-absorbing, sound insulation, heat-insulated, specific strength is high, plastics package, transportation, The fields such as military aerospace, office daily necessities are widely used.Expanded polypropylene (EPP) and polyethylene foamed (EPE) and foaming polyphenyl Ethylene (EPS) etc. is compared, and has the advantage of many uniquenesses: 1) mechanical property: since polyacrylic bending modulus is much larger than poly- second Alkene, so that EPP is better than EPE in anti-static load ability, impact resistance is better than EPS;2) heat resistance: EPP can be on 120 DEG C of left sides It is used for a long time in right hot environment, is that heat resistance is best in foamed plastics;3) degradability: there are one in polypropylene molecule Methyl, degradation property will be substantially better than polyethylene and polystyrene.In addition, EPP also has excellent resistance to chemical corrosion And stress crack resistance performance.EPP material auto industry, transport service, packaging industry using great competitiveness, can substitute EPS material and EPE material, application prospect are boundless.
Currently, the preparation method of polypropylene foam molded product mainly has extrusion molding, die pressing etc..Extrusion molding is general only It can be used for the production of the products such as sheet material, plate, it is difficult to prepare complex-shaped product.Die pressing be expanded bead is put into it is specific In the mold of shape, then makes to be welding together to form product between expanded bead using steam heating pressurization, be widely used in making Standby complex-shaped product.EPP bead foam technique is divided into two classes: intermittent kettle foam method, continous way extrusion foaming process.Between Formula of having a rest kettle foam method easy control of process conditions can prepare multiplying power and the regulatable expanded bead of rate of closed hole, but require pressure Power is high, and equipment investment is big, and at high cost, the production cycle is long, and worldwide the only companies such as JSP, BASF, KANKA use should Method is produced.Continous way extrusion foaming process is directly to squeeze the homogeneous melt of the polypropylene containing foaming agent from machine head port mould Out, it by quick pressure releasing, is mutually separated, makes the gas expansion for being dissolved in the homogeneous melt of polypropylene, then with bubble nucleating, length Greatly, solidify, disposable to complete to squeeze out and foam, process flow is simple, and industrial production efficiency is high.
The invention discloses a kind of methods for preparing expanded polypropylene beads using three-screw extruder, first by polypropylene Resin carries out low-temperature and high-speed with other raw materials or auxiliary agent and mixes, and obtains high melt strength, propylene foamed material, then high melt is strong It spends polypropylene expanded material and PIN-type three-screw extruder is added, carry out plasticizing mixing, and supercritical fluid is filled into three screw rods Extruder homogenizing zone forms homogeneous body, then foams in die orifice, is granulated through Water-circulating thermal cutting, forms ultrafine micropore polypropylene bead, most By centrifugal drying, vibration screening, expanded polypropylene beads are obtained.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation methods of expanded polypropylene beads.
The technical solution used in the present invention is:
A kind of preparation method of expanded polypropylene beads, comprising the following steps:
1) high-speed mixer is added in acrylic resin, active filler and auxiliary agent, 10~20 DEG C are uniformly mixed, and obtain poly- third Alkene foamed material;
2) three-screw extruder is added in polypropylene expanded material, is plasticized and is kneaded, then supercritical fluid is filled into The homogenizing zone of three-screw extruder, control mouth molding pressure are 5~25MPa, and die temperature is 110~160 DEG C, then through mouth mold moment Discharge foams, and obtains ultrafine micropore expanded polypropylene;
3) ultrafine micropore expanded polypropylene is granulated through die face Water-circulating thermal cutting, is dry, being sieved, and obtains expanded polypropylene beads.
Acrylic resin described in step 1) is homopolypropylene, in atactic copolymerized polypropene, block copolymerization polypropylene It is at least one.
Acrylic resin described in step 1) is homopolypropylene, in atactic copolymerized polypropene, block copolymerization polypropylene Mixture composed by least one and long chain branched polypropylene, wherein the mass fraction of long chain branched polypropylene is 5%~15%.
Active filler described in step 1) is the nanoscale talcum powder being activated through coupling agent, sodium benzoate, carbonic acid At least one of calcium, titanium dioxide, montmorillonite, silica, additive amount are the 0.5%~2% of acrylic resin quality.
Auxiliary agent described in step 1) is at least one of coupling agent, lubricant, antioxidant, colorant.
The lubricant is at least one of stearic acid, stearate, and additive amount is acrylic resin quality 0.5%~2%;The antioxidant is antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxygen dosage 168, antioxidant 264, at least one of antioxidant 626, additive amount are the 0.1%~0.5% of acrylic resin quality;The colorant is charcoal At least one of black, Masterbatch, additive amount are the 5%~10% of acrylic resin quality.
The head of three-screw extruder described in step 2 is provided with net-changing device, Melt Pump, mouth mold and die face Water-circulating thermal cutting Grain machine.
The additive amount of supercritical fluid described in step 2 is the 2%~10% of polypropylene expanded material quality.
Supercritical fluid described in step 2 is supercritical CO2, overcritical N2At least one of.
It is 40~70 DEG C that step 3), which carries out water temperature when die face Water-circulating thermal cutting is granulated,.
The beneficial effects of the present invention are:
1) it is not added in acrylic resin of the present invention or only adds a small amount of high melt strength, propylene, and completely It is compared using high melt strength, propylene, it is possible to reduce about half cost;
2) present invention is compared using three-screw extruder with single screw extrusion machine or double screw extruder, is had More powerful material conveys, builds pressure, mixing, dispersion, homogenizing and shear ability, and production capacity is big;
3) present invention reduces the interfacial free energy of Resin crystallization nucleation by the way that Activation filling to be dispersed in resin, Increase bubble heterogeneous nucleation, and Activation filling plays the work of physical crosslinking point when carrying out by three-screw extruder and being kneaded and disperse With can effectively improve the melt strength of material, improve the expandable ability of resin;
4) present invention using supercritical fluid as foaming agent, it is safe, environmental-friendly, expansion ratio is adjustable;
5) expanded polypropylene beads reactive blowing agent prepared by the present invention decomposes residue, can second time of foaming, finished product resilience Height is easily decomposed and is recycled, and can be widely used in the fields such as plastics package, transportation, military aerospace and office daily necessities.
Specific embodiment
A kind of preparation method of expanded polypropylene beads, comprising the following steps:
1) high-speed mixer is added in acrylic resin, active filler and auxiliary agent, 10~20 DEG C are uniformly mixed, and obtain poly- third Alkene foamed material;
2) three-screw extruder is added in polypropylene expanded material, is plasticized and is kneaded, then supercritical fluid is filled into The homogenizing zone of three-screw extruder, control mouth molding pressure are 5~25MPa, and die temperature is 110~160 DEG C, then through mouth mold moment Discharge foams, and obtains ultrafine micropore expanded polypropylene;
3) ultrafine micropore expanded polypropylene is granulated through die face Water-circulating thermal cutting, is dry, being sieved, and obtains expanded polypropylene beads.
Preferably, acrylic resin described in step 1) is homopolypropylene, atactic copolymerized polypropene, block copolymerization poly- third At least one of alkene.
Preferably, acrylic resin described in step 1) is homopolypropylene, atactic copolymerized polypropene, block copolymerization poly- third At least one of alkene and mixture composed by long chain branched polypropylene, wherein the mass fraction of long chain branched polypropylene be 5%~ 15%。
Preferably, active filler described in step 1) is the nanoscale talcum powder being activated through coupling agent, benzoic acid At least one of sodium, calcium carbonate, titanium dioxide, montmorillonite, silica, additive amount be acrylic resin quality 0.5%~ 2%。
It is further preferred that the active filler is the nanoscale talcum powder being activated through coupling agent.
Preferably, the nanoscale talcum powder being activated through coupling agent the preparation method is as follows: by nanoscale Talcum powder is added in high-speed kneading machine, 110 DEG C~125 DEG C high-speed stirred 15~20 minutes, when water content is lower than 0.3%, points three Secondary addition coupling agent is activated, total dosage be nanoscale talcum powder quality 0.5%~2%, every minor tick 2 minutes, always Being activated the time is 8~12 minutes.
Preferably, the coupling agent is silane coupling agent, titanate coupling agent, at least one in aluminate coupling agent Kind.
It is further preferred that the coupling agent is aluminate coupling agent.
Preferably, auxiliary agent described in step 1) is at least one of lubricant, antioxidant, colorant.
Preferably, the lubricant is at least one of stearic acid, stearate, and additive amount is acrylic resin matter The 0.5%~2% of amount.
It is further preferred that the lubricant is stearic acid.
Preferably, the antioxidant is antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxygen dosage 168, resists At least one of oxygen agent 264, antioxidant 626, additive amount are the 0.1%~0.5% of acrylic resin quality.
It is further preferred that the antioxidant is antioxidant 1010.
Preferably, the colorant is at least one of carbon black, Masterbatch, and additive amount is acrylic resin quality 5%~10%.
Preferably, the head of three-screw extruder described in step 2 is provided with net-changing device, Melt Pump, mouth mold and die face water Ring hot granulator.
Preferably, three-screw extruder described in step 2 is PIN-type three-screw extruder, screw diameter 62mm, spiral shell Bar draw ratio L/D is 36:1, and screw rod maximum speed is 500r/min.
Preferably, the additive amount of supercritical fluid described in step 2 is the 2%~10% of polypropylene expanded material quality.
Preferably, supercritical fluid described in step 2 is supercritical CO2, overcritical N2At least one of.
It is further preferred that supercritical fluid described in step 2 is supercritical CO2
Preferably, it is 40~70 DEG C that step 3), which carries out water temperature when die face Water-circulating thermal cutting is granulated,.
The present invention will be further explained combined with specific embodiments below and explanation.
Embodiment 1:
Nanoscale talcum powder that 100kg homopolypropylene, 1kg were activated through coupling agent, 0.5kg stearic acid and Low-temperature and high-speed mixing machine is added in 0.2kg antioxidant 1010 and 5kg nanoscale carbon black, is uniformly mixed, then material is fed with automatic Material system is transferred to three-screw extruder with the speed of 10kg/h, and filler is arranged in the machine barrel homogenizing zone of three-screw extruder, will Supercritical carbon dioxide is injected into machine barrel with the speed of 300g/h, and die orifice pressure is improved and stablized through Melt Pump, passes through head Mouth mold foaming, die face Water-circulating thermal cutting are granulated, and are dehydrated, and sieving obtains expanded polypropylene beads.Control mouth molding pressure is 8MPa, die temperature are 138 DEG C, obtain the black beads that expansion ratio is 28 times, and color is uniform.
Embodiment 2:
The nanoscale talcum that 90kg homopolypropylene, 10kg long chain branched polypropylene, 2kg were activated through coupling agent Powder, 1kg stearic acid, 0.5kg antioxidant 1010 and 8kg pink colour Masterbatch low-temperature and high-speed mixing machine is added, be uniformly mixed, then Material is transferred to three-screw extruder with automatic feeding system with the speed of 10kg/h, in the machine barrel homogenizing zone of three-screw extruder Filler is set, supercritical carbon dioxide is injected into machine barrel with the speed of 800g/h, die orifice is improved and stablized through Melt Pump Pressure is foamed by machine head port mould, and die face Water-circulating thermal cutting is granulated, and is dehydrated, and sieving obtains expanded polypropylene beads.Control Mouth mold pressure is 17MPa, and die temperature is 125 DEG C, obtains the pink colour bead that expansion ratio is 42 times, and color is uniform.
Embodiment 3:
100kg atactic copolymerized polypropene, the 0.5kg nanoscale talcum powder and 0.1kg being activated through coupling agent are resisted Low-temperature and high-speed mixing machine is added in oxidant 1010, is uniformly mixed, then material automatic feeding system is turned with the speed of 10kg/h Enter three-screw extruder, filler is set in the machine barrel homogenizing zone of three-screw extruder, by supercritical carbon dioxide with 300g/h Speed be injected into machine barrel, through Melt Pump improve and stablize die orifice pressure, foamed by machine head port mould, die face Water-circulating thermal cutting is made Grain dehydrates, and sieving obtains expanded polypropylene beads.Control mouth molding pressure is 5MPa, and die temperature is 118 DEG C, is sent out Steep the white beads that multiplying power is 8 times.
Embodiment 4:
The nanoscale that 95kg atactic copolymerized polypropene, 5kg long chain branched polypropylene, 1kg were activated through coupling agent is sliding Low-temperature and high-speed mixing machine is added in mountain flour, 1kg stearic acid, is uniformly mixed, then by material automatic feeding system with the speed of 10kg/h Degree be transferred to three-screw extruder, three-screw extruder machine barrel homogenizing zone be arranged filler, by supercritical carbon dioxide with The speed of 500g/h is injected into machine barrel, and die orifice pressure is improved and stablized through Melt Pump, is foamed by machine head port mould, die face water ring It is earnestly granulated, dehydrates, sieving obtains expanded polypropylene beads.Control mouth molding pressure is 9MPa, and die temperature is 120 DEG C, Obtain the white beads that expansion ratio is 18 times.
Embodiment 5:
Nanoscale talcum powder that 100kg block copolymerization polypropylene, 0.5kg were activated through coupling agent, 1kg stearic acid Low-temperature and high-speed mixing machine is added with 0.2kg antioxidant 1010, is uniformly mixed, then by material automatic feeding system with 10kg/h Speed be transferred to three-screw extruder, three-screw extruder machine barrel homogenizing zone be arranged filler, by supercritical carbon dioxide It is injected into machine barrel with the speed of 500g/h, die orifice pressure is improved and stablized through Melt Pump, is foamed by machine head port mould, die face water Ring is earnestly granulated, and is dehydrated, and sieving obtains expanded polypropylene beads.Control mouth molding pressure is 11MPa, die temperature 150 DEG C, obtain the white beads that expansion ratio is 36 times.
Embodiment 6:
The nanoscale that 85kg block copolymerization polypropylene, 15kg long chain branched polypropylene, 2kg were activated through coupling agent is sliding Low-temperature and high-speed mixing machine is added in mountain flour, 2kg stearic acid and 0.5kg antioxidant 1010, is uniformly mixed, then material is fed with automatic Material system is transferred to three-screw extruder with the speed of 10kg/h, and filler is arranged in the machine barrel homogenizing zone of three-screw extruder, will Supercritical carbon dioxide is injected into machine barrel with the speed of 900g/h, and die orifice pressure is improved and stablized through Melt Pump, passes through head Mouth mold foaming, die face Water-circulating thermal cutting are granulated, and are dehydrated, and sieving obtains expanded polypropylene beads.Control mouth molding pressure is 18MPa, die temperature are 146 DEG C, obtain the white beads that expansion ratio is 58 times.
Note: the expansion ratio of expanded polypropylene beads of the invention is tested by standard ASTM D792-2008, foaming Multiplying power formula are as follows: n=ρ0/ ρ, n is expansion ratio in formula;ρ0For the density of matrix resin;ρ is the density of expanded bead.The calculating of ρ Formula are as follows: ρ=m/(m+m1-m2), m is the aerial quality of expanded bead, m in formula1To make the water-immersed gold of foamed sample Belong to the quality of cap in water, m2For the quality of expanded bead in water.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention, It should be equivalent substitute mode, be included within the scope of the present invention.

Claims (1)

1. a kind of preparation method of expanded polypropylene beads, it is characterised in that: the following steps are included:
Nanoscale talcum powder that 90kg homopolypropylene, 10kg long chain branched polypropylene, 2kg were activated through coupling agent, 1kg Low-temperature and high-speed mixing machine is added in the Masterbatch of stearic acid, 0.5kg antioxidant 1010 and 8kg pink colour, is uniformly mixed, then by material Three-screw extruder is transferred to the speed of 10kg/h with automatic feeding system, is added in the machine barrel homogenizing zone setting of three-screw extruder Supercritical carbon dioxide is injected into machine barrel by geat with the speed of 800g/h, and die orifice pressure is improved and stablized through Melt Pump, is led to Machine head port mould foaming is crossed, control mouth molding pressure is 17MPa, and die temperature is 125 DEG C, and die face Water-circulating thermal cutting is granulated, dehydration and drying, Sieving, obtains expanded polypropylene beads;
Or, comprising the following steps:
The nanoscale talcum that 85kg block copolymerization polypropylene, 15kg long chain branched polypropylene, 2kg were activated through coupling agent Low-temperature and high-speed mixing machine is added in powder, 2kg stearic acid and 0.5kg antioxidant 1010, is uniformly mixed, then by material mechanical feed System is transferred to three-screw extruder with the speed of 10kg/h, and filler is arranged in the machine barrel homogenizing zone of three-screw extruder, will surpass Critical carbon dioxide is injected into machine barrel with the speed of 900g/h, and die orifice pressure is improved and stablized through Melt Pump, passes through head mouth Mould foaming, control mouth molding pressure are 18MPa, and die temperature is 146 DEG C, and die face Water-circulating thermal cutting is granulated, and is dehydrated, and sieving obtains To expanded polypropylene beads.
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CN107892774A (en) * 2017-12-14 2018-04-10 成都日之容塑料制品有限公司 A kind of polypropylene supercritical foaming process
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