CN106543559A - 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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Publication number
CN106543559A
CN106543559A CN201610903870.9A CN201610903870A CN106543559A CN 106543559 A CN106543559 A CN 106543559A CN 201610903870 A CN201610903870 A CN 201610903870A CN 106543559 A CN106543559 A CN 106543559A
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polypropylene
preparation
expanded
antioxidant
acrylic resin
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CN106543559B (en
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袁瑞建
朱红芳
杨正高
陈钢
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Hubei Jushi New Material Technology Co.,Ltd.
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GUANGDONG JUSHI CHEMICAL INDUSTRY Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-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
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C08K5/134—Phenols containing ester groups
    • C08K5/1345—Carboxylic esters of phenolcarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions 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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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised 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
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised 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
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2353/00—Characterised 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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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K2201/011—Nanostructured additives
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention discloses a kind of preparation method of expanded polypropylene beads, which comprises the following steps：1）High-speed mixer, 10～20 DEG C of mix homogeneously is added to obtain polypropylene expanded material acrylic resin, active filler and auxiliary agent；2）Polypropylene expanded material is added into three-screw extruder, is plastified and is kneaded, then fill supercritical fluid, control mouth molding pressure is 5～25MPa, and die temperature is 110～160 DEG C, then oral mould moment release of pressure, is foamed, obtains ultrafine micropore expanded polypropylene；3）Ultrafine micropore expanded polypropylene Jing die face Water-circulating thermal cutting pelletizes, drying, sieve, obtain expanded polypropylene beads.Method of the present invention low production cost, production capacity is big, safety and environmental protection, in the expanded polypropylene beads of preparation, reactive blowing agent decomposes residue, can second time of foaming, expansion ratio is adjustable, and finished product resilience is high, easily decompose and reclaim, the fields such as plastics package, transportation, military aerospace and office article of everyday use 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 method of expanded polypropylene beads, and in particular to a kind of to adopt Tri-screw Extrusion mechanism The method of preparation foaming polypropylene bead, belongs to polymer foaming technical field.
Background technology
Foam plasticss have the advantages that light weight, energy-absorbing, sound insulation, heat-insulated, specific strength are high, plastics package, transportation, The fields such as military aerospace, office article of everyday use are widely used.Expanded polypropylene（EPP）With polyethylene foamed（EPE）With foaming polyphenyl Ethylene（EPS）Etc. comparing, possesses the advantage of many uniquenesses：1）Mechanical property：As polyacrylic bending moduluses are 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）Thermostability：EPP can be left at 120 DEG C Used in right hot environment for a long time, be that thermostability is best in foam plasticss；3）Degradability：There is one in polypropylene molecule Methyl, its degradation property will be substantially better than polyethylene and polystyrene.Additionally, EPP also has excellent resistance to chemical corrosion And stress crack resistance performance.EPP materials auto industry, transport service, packaging industry the great competitiveness of application, can substitute EPS materials and EPE materials, application prospect are boundless.
At present, the preparation method of polypropylene foam products formed mainly has extrusion molding, die pressing etc..Extrusion molding is general only The production of the products such as sheet material, sheet material can be used for, it is difficult to prepare complex-shaped product.Die pressing be expanded bead is put into it is specific In the mould of shape, then make to be welding together to form product between expanded bead using steam heating pressurization, be widely used in system Standby complex-shaped product.EPP bead foam techniques are divided into two classes：Batch (-type) kettle foam method, continuous 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, high cost, long the production cycle, and worldwide the only company such as JSP, BASF, KANKA employing should Method is produced.Continuous way extrusion foaming process is that the polypropylene containing foaming agent homogeneous melt is directly squeezed from machine head port mould Go out, by quick pressure releasing, be separated, make to be dissolved in the gas expansion of the homogeneous melt of polypropylene, then with bubble nucleating, length Greatly, solidify, disposably complete to extrude and foam, technological process is simple, industrial production efficiency is high.
The invention discloses a kind of method that employing three-screw extruder prepares expanded polypropylene beads, 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 will be high melt strong Spend polypropylene expanded material and add PIN-type three-screw extruder, carry out plasticizing mixing, and supercritical fluid is filled into into three screw rods Extruder homogenizing zone forms homogeneous body, then foams in die orifice, and Jing Water-circulating thermal cutting pelletizes form ultrafine micropore polypropylene bead, most By centrifugal drying, vibration screening, expanded polypropylene beads are obtained.
The content of the invention
It is an object of the invention to provide a kind of preparation method of expanded polypropylene beads.
The technical solution used in the present invention is：
A kind of preparation method of expanded polypropylene beads, comprises the following steps：
1) high-speed mixer, 10～20 DEG C of mix homogeneously is added to obtain polypropylene and send out acrylic resin, active filler and auxiliary agent Foam material；
2) polypropylene expanded material is added into three-screw extruder, is plastified and kneaded, then supercritical fluid is filled into into three spiral shells The homogenizing zone of bar extruder, control mouth molding pressure are 5～25MPa, and die temperature is 110～160 DEG C, then oral mould moment releases Pressure, is foamed, is obtained ultrafine micropore expanded polypropylene；
3) the Water-circulating thermal cutting pelletize of ultrafine micropore expanded polypropylene Jing die faces, drying, sieve, obtain expanded polypropylene beads.
Step 1）Described acrylic resin is HOPP, atactic copolymerized polypropene, in block copolymerization polypropylene It is at least one.
Step 1）Described acrylic resin is HOPP, atactic copolymerized polypropene, in block copolymerization polypropylene At least one mixture constituted with long chain branched polypropylene, the wherein mass fraction of long chain branched polypropylene are 5%～15%.
Step 1）Described active filler be Jing coupling agent activation processing cross nanoscale talcum powder, sodium benzoate, carbonic acid Calcium, titanium dioxide, montmorillonite, at least one in silicon dioxide, addition for acrylic resin quality 0.5%～2%.
Step 1）Described auxiliary agent is coupling agent, lubricant, antioxidant, at least one in coloring agent.
Described lubricant is stearic acid, at least one in stearate, and addition is acrylic resin quality 0.5%～2%；Described antioxidant is antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxygen dosage 168, antioxidant 264th, at least one in antioxidant 626, addition for acrylic resin quality 0.1%～0.5%；Described coloring agent is charcoal At least one in black, Masterbatch, addition for acrylic resin quality 5%～10%.
Step 2）The head of described three-screw extruder is provided with net-changing device, Melt Pump, mouth mold and die face Water-circulating thermal cutting Grain machine.
Step 2）The addition of described supercritical fluid is the 2%～10% of polypropylene expanded material quality.
Step 2）Described supercritical fluid is supercritical CO2, supercritical N2In at least one.
Step 3）Water temperature when carrying out die face Water-circulating thermal cutting pelletize is 40～70 DEG C.
The invention has the beneficial effects as follows：
1）It is not added with acrylic resin of the present invention or only adds a small amount of high melt strength, propylene, and adopts completely High melt strength, propylene is compared, it is possible to reduce about half cost；
2）The present invention uses three-screw extruder, compares with single screw extrusion machine or double screw extruder, possesses higher Big material is conveyed, builds pressure, mixing, dispersion, homogenizing and shear ability, and production capacity is big；
3）The present invention reduces the interfacial free energy of Resin crystallization nucleation by Activation filling is dispersed in resin, increases Bubble heterogeneous nucleation, and Activation filling plays a part of physical crosslinking point when mixing dispersion is carried out by three-screw extruder, The melt strength of material can be effectively improved, the expandable ability of resin is improved；
4）, using supercritical fluid as foaming agent, safety, environmental friendliness, expansion ratio are adjustable for the present invention；
5）Expanded polypropylene beads reactive blowing agent prepared by the present invention decomposes residue, can second time of foaming, finished product resilience is high, easily Decompose and reclaim, the fields such as plastics package, transportation, military aerospace and office article of everyday use can be widely used in.
Specific embodiment
A kind of preparation method of expanded polypropylene beads, comprises the following steps：
1) high-speed mixer, 10～20 DEG C of mix homogeneously is added to obtain polypropylene and send out acrylic resin, active filler and auxiliary agent Foam material；
2) polypropylene expanded material is added into three-screw extruder, is plastified and kneaded, then supercritical fluid is filled into into three spiral shells The homogenizing zone of bar extruder, control mouth molding pressure are 5～25MPa, and die temperature is 110～160 DEG C, then oral mould moment releases Pressure, is foamed, is obtained ultrafine micropore expanded polypropylene；
3) the Water-circulating thermal cutting pelletize of ultrafine micropore expanded polypropylene Jing die faces, drying, sieve, obtain expanded polypropylene beads.
Preferably, step 1）Described acrylic resin is HOPP, atactic copolymerized polypropene, block copolymerization poly- third At least one in alkene.
Preferably, step 1）Described acrylic resin is HOPP, atactic copolymerized polypropene, block copolymerization poly- third The mixture constituted by least one and long chain branched polypropylene in alkene, the wherein mass fraction of long chain branched polypropylene be 5%～ 15%。
Preferably, step 1）Described active filler be Jing coupling agent activation processing cross nanoscale talcum powder, benzoic acid Sodium, Calcium Carbonate, titanium dioxide, montmorillonite, at least one in silicon dioxide, addition for acrylic resin quality 0.5%～ 2%。
It is further preferred that described active filler is the nanoscale talcum powder that Jing coupling agent activation processing is crossed.
Preferably, the preparation method of the nanoscale talcum powder that described Jing coupling agent activation processing is crossed is as follows：By nanoscale During Pulvis Talci adds high-speed kneading machine, 110 DEG C～125 DEG C high-speed stirred 15～20 minutes, when water content is less than 0.3%, points three Secondary addition coupling agent carries out activation processing, and total consumption is the 0.5%～2% of nanoscale talcum powder quality, every minor tick 2 minutes, always The activation processing time is 8～12 minutes.
Preferably, described coupling agent be silane coupler, titanate coupling agent, in aluminate coupling agent at least one Kind.
It is further preferred that described coupling agent is aluminate coupling agent.
Preferably, step 1）Described auxiliary agent is lubricant, antioxidant, at least one in coloring agent.
Preferably, described lubricant be stearic acid, at least one in stearate, addition is acrylic resin matter The 0.5%～2% of amount.
It is further preferred that described lubricant is stearic acid.
Preferably, described antioxidant is antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxygen dosage 168, anti- At least one in oxygen agent 264, antioxidant 626, addition for acrylic resin quality 0.1%～0.5%.
It is further preferred that described antioxidant is antioxidant 1010.
Preferably, described coloring agent be white carbon black, at least one in Masterbatch, addition is acrylic resin quality 5%～10%.
Preferably, step 2）The head of described three-screw extruder is provided with net-changing device, Melt Pump, mouth mold and die face water Ring hot granulator.
Preferably, step 2）Described three-screw extruder is PIN-type three-screw extruder, and screw diameter is 62mm, spiral shell Bar draw ratio L/D is 36:1, screw rod maximum speed is 500r/min.
Preferably, step 2）The addition of described supercritical fluid is the 2%～10% of polypropylene expanded material quality.
Preferably, step 2）Described supercritical fluid is supercritical CO2, supercritical N2In at least one.
It is further preferred that step 2）Described supercritical fluid is supercritical CO2。
Preferably, step 3）Water temperature when carrying out die face Water-circulating thermal cutting pelletize is 40～70 DEG C.
The present invention is made further explanation and description with reference to specific embodiment.
Embodiment 1：
Nanoscale talcum powder, 0.5kg stearic acid and the 0.2kg that 100kg HOPPs, 1kg Jing coupling agent activation processing are crossed Antioxidant 1010 and 5kg nanoscales white carbon black add low-temperature and high-speed mixer, mix homogeneously, then by material automatic feeding system Three-screw extruder is proceeded to the speed of 10kg/h, filler is set in the machine barrel homogenizing zone of three-screw extruder, by supercritical Carbon dioxide is injected in machine barrel with the speed of 300g/h, and Jing Melt Pumps are improved and stable die orifice pressure, are sent out by machine head port mould Bubble, die face Water-circulating thermal cutting pelletize, dehydrate sieve, and obtain expanded polypropylene beads.Control mouth molding pressure be 8MPa, mouth mold Temperature is 138 DEG C, obtains the black beads that expansion ratio is 28 times, and color and luster is homogeneous.
Embodiment 2：
Nanoscale talcum powder that 90kg HOPPs, 10kg long chain branched polypropylenes, 2kg Jing coupling agent activation processing are crossed, 1kg The Masterbatch of stearic acid, 0.5kg antioxidant 1010s and 8kg pink colours adds low-temperature and high-speed mixer, mix homogeneously, then by material Three-screw extruder is proceeded to the speed of 10kg/h with automatic feeding system, is arranged in the machine barrel homogenizing zone of three-screw extruder and is added Geat, supercritical carbon dioxide is injected in machine barrel with the speed of 800g/h, and Jing Melt Pumps are improved and stable die orifice pressure, are led to Machine head port mould foaming is crossed, die face Water-circulating thermal cutting pelletize, dehydrate are sieved, and obtain expanded polypropylene beads.Control mouth molding pressure For 17MPa, die temperature is 125 DEG C, obtains the pink colour beadlet that expansion ratio is 42 times, and color and luster is homogeneous.
Embodiment 3：
The nanoscale talcum powder that 100kg atactic copolymerized polypropenes, 0.5kg Jing coupling agent activation processing are crossed and 0.1kg antioxidation Agent 1010 adds low-temperature and high-speed mixer, mix homogeneously, then material automatic feeding system is proceeded to three with the speed of 10kg/h Screw extruder, arranges filler in the machine barrel homogenizing zone of three-screw extruder, by supercritical carbon dioxide with the speed of 300g/h Degree is injected in machine barrel, and Jing Melt Pumps are improved and stable die orifice pressure, are foamed by machine head port mould, die face Water-circulating thermal cutting pelletize, Dehydrate, sieves, and obtains expanded polypropylene beads.Control mouth molding pressure is 5MPa, and die temperature is 118 DEG C, is foamed Multiplying power is 8 times of white beads.
Embodiment 4：
Nanoscale talcum powder that 95kg atactic copolymerized polypropenes, 5kg long chain branched polypropylenes, 1kg Jing coupling agent activation processing are crossed, 1kg stearic acid adds low-temperature and high-speed mixer, mix homogeneously, then material automatic feeding system is proceeded to the speed of 10kg/h Three-screw extruder, arranges filler in the machine barrel homogenizing zone of three-screw extruder, by supercritical carbon dioxide with 500g/h's Speed is injected in machine barrel, and Jing Melt Pumps are improved and stable die orifice pressure, are foamed by machine head port mould, and die face Water-circulating thermal cutting is made Grain, dehydrate sieve, and obtain expanded polypropylene beads.Control mouth molding pressure is 9MPa, and die temperature is 120 DEG C, is sent out Bubble multiplying power is 18 times of white beads.
Embodiment 5：
Nanoscale talcum powder that 100kg block copolymerization polypropylenes, 0.5kg Jing coupling agent activation processing are crossed, 1kg stearic acid and 0.2kg antioxidant 1010s addition low-temperature and high-speed mixer, mix homogeneously, then by material automatic feeding system with 10kg/h's Speed proceeds to three-screw extruder, three-screw extruder machine barrel homogenizing zone arrange filler, by supercritical carbon dioxide with The speed of 500g/h is injected in machine barrel, and Jing Melt Pumps are improved and stable die orifice pressure, are foamed by machine head port mould, die face water ring Earnestly pelletize, dehydrate are sieved, and obtain expanded polypropylene beads.Control mouth molding pressure is 11MPa, and die temperature is 150 DEG C, obtain the white beads that expansion ratio is 36 times.
Embodiment 6：
The nanoscale Talcum that 85kg block copolymerization polypropylenes, 15kg long chain branched polypropylenes, 2kg Jing coupling agent activation processing are crossed Powder, 2kg stearic acid and 0.5kg antioxidant 1010s add low-temperature and high-speed mixer, mix homogeneously, then by material mechanical feed System proceeds to three-screw extruder with the speed of 10kg/h, arranges filler in the machine barrel homogenizing zone of three-screw extruder, will be super Critical carbon dioxide is injected in machine barrel with the speed of 900g/h, and Jing Melt Pumps are improved and stable die orifice pressure, by head mouth Mould foams, and die face Water-circulating thermal cutting pelletize, dehydrate are sieved, and obtain expanded polypropylene beads.Control mouth molding pressure is 18MPa, Die temperature is 146 DEG C, obtains the white beads that expansion ratio is 58 times.
Note：The expansion ratio of the expanded polypropylene beads of the present invention is tested by standard ASTM D792-2008, is foamed Multiplying power formula is：n=ρ0/ ρ, in formula, n is expansion ratio；ρ0Based on resin density；Density of the ρ for expanded bead.The calculating of ρ Formula is：ρ=m/（m+m1-m2）, in formula m be the aerial quality of expanded bead, m1To make the water-immersed gold of foamed sample Category quality of the cap in water, m2The quality for being expanded bead in water.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by above-described embodiment Limit, other any spirit without departing from the present invention and the change, modification, replacement made under principle, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims (10)

1. a kind of preparation method of expanded polypropylene beads, it is characterised in that：Comprise the following steps：
1) high-speed mixer, 10～20 DEG C of mix homogeneously is added to obtain polypropylene and send out acrylic resin, active filler and auxiliary agent Foam material；
2) polypropylene expanded material is added into three-screw extruder, is plastified and kneaded, then supercritical fluid is filled into into three spiral shells The homogenizing zone of bar extruder, control mouth molding pressure are 5～25MPa, and die temperature is 110～160 DEG C, then oral mould moment releases Pressure, is foamed, is obtained ultrafine micropore expanded polypropylene；
3) the Water-circulating thermal cutting pelletize of ultrafine micropore expanded polypropylene Jing die faces, drying, sieve, obtain expanded polypropylene beads.
2. preparation method according to claim 1, it is characterised in that：Step 1）Described acrylic resin is homopolymerization poly- third At least one in alkene, atactic copolymerized polypropene, block copolymerization polypropylene.
3. preparation method according to claim 1, it is characterised in that：Step 1）Described acrylic resin is homopolymerization poly- third The mixture constituted by least one and long chain branched polypropylene in alkene, atactic copolymerized polypropene, block copolymerization polypropylene, wherein The mass fraction of long chain branched polypropylene is 5%～15%.
4. preparation method according to claim 1, it is characterised in that：Step 1）Described active filler is lived for Jing coupling agents Nanoscale talcum powder that change was processed, sodium benzoate, Calcium Carbonate, titanium dioxide, montmorillonite, at least one in silicon dioxide, Addition for acrylic resin quality 0.5%～2%.
5. preparation method according to claim 1, it is characterised in that：Step 1）Described auxiliary agent be lubricant, antioxidant, At least one in coloring agent.
6. preparation method according to claim 5, it is characterised in that：Described lubricant is stearic acid, in stearate At least one, addition for acrylic resin quality 0.5%～2%；Described antioxidant is antioxidant 1010, antioxidant 1098th, at least one in antioxidant 1076, antioxygen dosage 168, antioxidant 264, antioxidant 626, addition are polypropylene tree The 0.1%～0.5% of lipid amount；Described coloring agent is white carbon black, at least one in Masterbatch, and addition is acrylic resin matter The 5%～10% of amount.
7. preparation method according to claim 1, it is characterised in that：Step 2）The head of described three-screw extruder sets It is equipped with net-changing device, Melt Pump, mouth mold and die face water circular heating granule cutting machine.
8. preparation method according to claim 1, it is characterised in that：Step 2）The addition of described supercritical fluid is The 2%～10% of polypropylene expanded material quality.
9. preparation method according to claim 1, it is characterised in that：Step 2）Described supercritical fluid is supercritical CO2, supercritical N2In at least one.
10. preparation method according to claim 1, it is characterised in that：Step 3）When carrying out die face Water-circulating thermal cutting pelletize Water temperature is 40～70 DEG C.
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CN107602903A (en) * 2017-09-07 2018-01-19 绵阳旺通科技有限公司 A kind of preparation method of high yield low-cost environment-friendly polypropylene bead
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
CN109401055A (en) * 2018-10-31 2019-03-01 无锡会通轻质材料股份有限公司 A kind of colorful Antistatic type expanded polypropylene beads and preparation method thereof
CN109912886A (en) * 2019-03-13 2019-06-21 衢州欣力工贸有限公司 Composite master batch and preparation method thereof for polypropylene to-go box
CN110144060A (en) * 2018-07-11 2019-08-20 南京洛普科技有限公司 A kind of preparation method and its preparation facilities of high melt strength, propylene absorbing material
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CN107602903A (en) * 2017-09-07 2018-01-19 绵阳旺通科技有限公司 A kind of preparation method of high yield low-cost environment-friendly polypropylene bead
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
CN110144060A (en) * 2018-07-11 2019-08-20 南京洛普科技有限公司 A kind of preparation method and its preparation facilities of high melt strength, propylene absorbing material
CN109401055A (en) * 2018-10-31 2019-03-01 无锡会通轻质材料股份有限公司 A kind of colorful Antistatic type expanded polypropylene beads and preparation method thereof
CN109912886A (en) * 2019-03-13 2019-06-21 衢州欣力工贸有限公司 Composite master batch and preparation method thereof for polypropylene to-go box
CN113563630A (en) * 2021-08-11 2021-10-29 江苏中科聚合新材料产业技术研究院有限公司 Preparation method and application of durable hydrophilic polypropylene foaming particles
CN114316452A (en) * 2022-01-04 2022-04-12 苏州浩纳新材料科技有限公司 Super-hydrophobic foamed polypropylene and preparation method thereof
CN114770844A (en) * 2022-05-11 2022-07-22 广州东邦怡丰汽车配件科技有限公司 Integrated forming process for lightweight automobile seat
CN116120621A (en) * 2022-12-20 2023-05-16 四川大学 Triboelectric regenerated product based on waste polypropylene and preparation method thereof
CN116120621B (en) * 2022-12-20 2023-10-13 四川大学 Triboelectric regenerated product based on waste polypropylene and preparation method thereof

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