CN108164831A - Polypropylene foam with graded pore structure and preparation method thereof - Google Patents

Polypropylene foam with graded pore structure and preparation method thereof Download PDF

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Publication number
CN108164831A
CN108164831A CN201711344078.5A CN201711344078A CN108164831A CN 108164831 A CN108164831 A CN 108164831A CN 201711344078 A CN201711344078 A CN 201711344078A CN 108164831 A CN108164831 A CN 108164831A
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polypropylene
pore structure
preparation
acrylic resin
graded pore
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CN108164831B (en
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唐涛
邱健
邢海平
姜治伟
李明罡
王凯
薛俭
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Changchun Institute of Applied Chemistry of CAS
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Changchun Institute of Applied Chemistry of CAS
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • C08J9/14—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 organic
    • C08J9/141—Hydrocarbons
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • 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
    • C08J2323/14—Copolymers of propene
    • 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
    • C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
    • C08J2471/02—Polyalkylene oxides

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Polypropylene foam with graded pore structure and preparation method thereof belongs to expanded material technical field.It solves and how to provide that a kind of process is simple, and equipment requirement is low, can realize material abscess graded, meeting material application field different parts has the characteristics that the problem of foamed material preparation method of different structures and performance requirement.The preparation method of the present invention, first polypropylene, alcohols and nucleating agent are weighed by different ratio, then through multi-layer co-extruded, wire drawing, pelletizing, obtain the acrylic resin particle with Multi-layers distributing, or extruded machine extrusion, wire drawing, pelletizing, the acrylic resin particle of a variety of different compositions is obtained, after being molded into sheet material, superposition melting molding, obtains the acrylic resin sheet material with Multi-layers distributing；Finally multilayer particle or multi-layer sheet are foamed, obtain the polypropylene foam with graded pore structure.The preparation method is simple, easy to operate, low for equipment requirements, and the material abscess gradient prepared is controllable.

Description

Polypropylene foam with graded pore structure and preparation method thereof
Technical field
The invention belongs to polymeric foamable material technical fields, and in particular to a kind of polypropylene bubble with graded pore structure Foam material and preparation method thereof.
Background technology
Currently, as the fields such as nuclear energy, electronics, optics, chemistry, electromagnetism, biomedicine are to various functions material property It is required that continuous improvement, functionally graded material be designed as a variety of materials performance preparation realization provide possibility.Functionally gradient Material is that two or more is controlled by using different previous complex techniques and formed with raw material of different nature The element (composition, structure) of material is in consecutive variations along a direction, so as to which the property of material and function be made also to change in gradient New material.The one kind of gradient-porosity material as functionally graded material, gradient-porosity material not only have meet material should There is different structures and performance requirement with field different parts, and enhance material in sound absorption, electromagnetic wave, more work( The features such as energy separation or absorbing film effect.
At present, gradient porous material is more in ceramics and metal field research, and polymeric material field research is then less.Mesh Preceding preparation method is concentrated mainly on following several：Layer stackup addition, control foaming agents content gradient method, control blowing temperature gradient Method, pore-foaming agent gradient distribution, various methods have the shortcomings that respective, such as the superposition interface problem of layer stackup addition, control hair The condition rigors of infusion Content Method, blowing temperature gradient method, the residue problem of the pore-foaming agent of hole agent gradient method.For these Problem, CN102321309A report a kind of thermoplastic blend pitch control resin Composition concentration gradients distribution, physical blowing The method of the porous material of gradient pore variation is obtained.CN 102796277B describe a kind of open-celled structure gradient bio-compatible Property polymer porous material, control the biocompatible polymer blending of two kinds of different components, prepare gradient parison, then physics Foaming has obtained gradient open cell porous material.CN 105367817A describe a kind of perforated membrane of close carbon dioxide modification with gathering It is compound to close object, it is foamed to obtain graded porous polymer.CN 106336522A disclose a kind of control interlayer polypropylene not The method for preparing multi-gradient polypropylene bead with melting point resins and nucleation agent content physical blowing.But the method for these reports, The changes in balance of comprehensive performance has higher requirement after material compatibility, blending to blending.Therefore, seek it is a kind of simple, Equipment requirement is low, the easily controlled method of basis material prepares the polymer porous material of abscess diameter graded becomes more to compel It cuts.
Invention content
In view of the problems of the existing technology, the purpose of the present invention is to provide a kind of polypropylene with graded pore structure Foamed material and preparation method thereof, this method process is simple, and equipment requirement is low, realizes material abscess graded so that material With good mouldability, the characteristics of assigning material unique functionality, excellent physical property.
In order to solve the above technical problem, the present invention provides following technical solutions：
The preparation method of polypropylene foam with graded pore structure is to weigh polypropylene, alcohols by different ratio And nucleating agent, multi-layer co-extruded equipment is separately added into, while foaming agent is passed through into multi-layer co-extruded equipment, it is multi-layer co-extruded Foaming is carried out at the same time, obtains the polypropylene foam with graded pore structure；
Alternatively, the preparation method includes the following steps：
1) polypropylene, alcohols and nucleating agent are weighed by different ratio, through multi-layer co-extruded, wire drawing, pelletizing, obtains having more The acrylic resin particle of layer distribution；
Alternatively, weighing polypropylene, alcohols and nucleating agent by different ratio, extruded machine extrusion, wire drawing, pelletizing, obtain respectively To the acrylic resin particle of a variety of different compositions, the acrylic resin particle of different compositions is molded into sheet material respectively, by piece Material is superimposed in a mold, and melting molding obtains the acrylic resin sheet material with Multi-layers distributing；
The quality of the nucleating agent weighed accounts for the 0.01%-5% of polypropylene, alcohols and nucleating agent gross mass, the alcohol Class is polyethylene glycol and/or glycerine, and the quality of the alcohols weighed is the 0.1%-10% of polypropylene quality weighed；
2) the acrylic resin particle with Multi-layers distributing or the acrylic resin sheet material with Multi-layers distributing are sent out Bubble, obtains the polypropylene foam with graded pore structure.
Preferably, the foaming agent is one or more in carbon dioxide, nitrogen, air, butane, pentane.
Preferably, in step 1), while polypropylene, alcohols and nucleating agent is weighed, it is also weighed out additive.
Preferably, the additive is antioxidant, and the quality of antioxidant accounts for polypropylene, alcohols and nucleating agent gross mass 0.2-0.3%.
Preferably, in step 1), the polypropylene is homopolypropylene or copolymer polypropylene, and the copolymer polypropylene is Binary copolymerization polypropylene or ternary polymerized polypropylene.
Preferably, in step 1), the nucleating agent is talcum powder, calcium carbonate, white carbon, graphene, kaolin, carbon are received One or more mixing in any proportion in mitron, zinc borate, montmorillonite.
Preferably, in step 1), number of plies n >=3 of the multilayer.
Preferably, in step 2), the foaming is kettle foam or moulded from foam.
Preferably, the foaming is kettle foam, and process is：
Acrylic resin particle with Multi-layers distributing is placed in reaction kettle, is passed through foaming agent, first controls pressure in kettle Then 2-20Mpa, 125-180 DEG C of temperature, saturation 0.5h-2h are melted completely in the acrylic resin particle with Multi-layers distributing Temperature obtains density as 0.02g/cm hereinafter, fast pressure relief3-0.5g/cm3Graded pore structure expanded particle, finally will hair It steeps particle and adds in molding machine, be molded under water vapor pressure 0.2-0.3Mpa, obtain polypropylene foam；
The foaming agent is carbon dioxide, one or more in nitrogen, air, butane, pentane.
Preferably, the foaming is moulded from foam, and process is：
Acrylic resin sheet material with Multi-layers distributing is filled into plate vulcanization machine die, first in temperature 130-180 DEG C, it is passed through foaming agent, under pressure 2-20Mpa, saturation 0.5-2h is so completely molten in the acrylic resin sheet material with Multi-layers distributing Melt temperature hereinafter, fast pressure relief foams, it is 0.02g/cm to obtain density3-0.5g/cm3With graded pore structure polypropylene bubble Foam material；
The foaming agent is carbon dioxide, one or more in nitrogen, air, butane, pentane.
The preparation method of the above-mentioned polypropylene foam with graded pore structure is prepared poly- with graded pore structure Acryl foam material.
The principle of the present invention is：The foam structure of polymer derives from the nucleation of foaming process of polymer and the increasing of abscess It is long, it adds that different auxiliary agents is compound with polymer, number and the aperture of abscess can be adjusted.Polyethylene glycol and/or glycerine plus Cell diameter can be increased by entering.And the addition of nucleating agent, the number of abscess can be increased, reduce the size of abscess.Polyethylene glycol And/or glycerine and the compound of nucleating agent can effectively adjust the variation of abscess-size sum number purpose, realize gradient pore polypropylene bubble The preparation of foam material.
Compared with prior art, the invention has the advantages that：
1st, the preparation method of the polypropylene foam with graded pore structure of the invention, with the regulation and control of auxiliary agent, that is, matches Based on side's regulation and control, polypropylene species selectivity is big.
2nd, the preparation method of the polypropylene foam with graded pore structure of the invention, foaming condition such as temperature, pressure Power mild condition, preparation method process is simple, low for equipment requirements.
3rd, the preparation method of the polypropylene foam with graded pore structure of the invention, the selection of nucleating agent and abscess Graded is combined, and on the basis of effectively changing foam mechanical property, heat is transmitted, can effectively provide the functionalization of material, Cost is reduced, widens application of the material in the fields such as automobile, food, medical.
Description of the drawings
Fig. 1 is the section gradient pore SEM figures of the polypropylene foam with graded pore structure prepared by embodiment 1.
Specific embodiment
The preferred implementation of the present invention is illustrated below, it should be understood that preferred embodiment described herein is only used for The description and interpretation present invention, is not intended to limit the present invention.
It further illustrates the present invention with reference to embodiments.
Embodiment 1
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) copolymer polypropylene (Yanshan Petrochemical PP4220), Macrogol 6000, montmorillonite and the antioxygen of three kinds of proportionings are weighed Agent B215 mixes feeding respectively, extruded machine is multi-layer co-extruded, wire drawing, pelletizing, obtain three layers distribution acrylic resins Grain；
In each proportioning, the amount of Macrogol 6000 is respectively 0.8%, 0.2%, 0.04%；The amount of montmorillonite is respectively 0.04%th, 0.5%, 0.8%, the additive amount of antioxidant is 0.2wt%；
2) the acrylic resin particle by three layers of distribution is placed in reaction kettle, is passed through air as foaming agent, controls kettle internal pressure Power 5Mpa, 125 DEG C of saturation time 1h of temperature, in 140 DEG C of conditions of blowing temperature, fast pressure relief obtains 0.05g/cm3Had Three layers of graded pore structure expanded particle, then add in molding machine by expanded particle, are molded, obtain under water vapor pressure 0.25Mpa To polypropylene foam.
Embodiment 2
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) weigh three kinds proportioning copolymer polypropylene (Yanshan Petrochemical PP4220), glycerine, carbon nanotube (caliber 50-90nm, Length 5-10um) and antioxidant B215, feeding is mixed respectively, and extruded machine extrusion, wire drawing, pelletizing obtain three kinds of different compositions Acrylic resin particle；
In each proportioning, glycerine additive amount is respectively 2.7%, 0.1%, 0.03%；The additive amount of carbon nanotube is respectively 0.03%th, 0.1%, 0.7%；The additive amount of antioxidant is 0.2wt%；
2) the acrylic resin particle of three kinds of different compositions is molded in flakes respectively, be superimposed in a mold, high-temperature fusion mould Pressure, obtains the acrylic resin sheet material with Multi-layers distributing, is filled into plate vulcanization machine die, in 130 DEG C of temperature, foaming agent CO2Under pressure 6Mpa, saturation 1.5h, 144 DEG C of blowing temperature, fast pressure relief obtains density 0.035g/cm3Have three layers of gradient The polypropylene foam of pore structure.
Embodiment 3
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) weigh three kinds proportioning polypropylene (Tm=167 DEG C, Daqing petrochemical T30S), alcohols, talcum powder (2500 mesh) and Antioxidant B215, mixes feeding respectively, and extruded machine extrusion, wire drawing, pelletizing obtain the acrylic resin of three kinds of different compositions Grain；
Wherein, alcohols is polyethylene glycol and glycerine (weight ratio 1:1, PEG4000), total addition level be respectively 3.0%, 0.5%th, 0.1%；The additive amount of talcum powder is respectively 0.1%, 0.5%, 1.0%；The additive amount of antioxidant is 0.2wt%；
2) the acrylic resin particle of three kinds of different compositions is molded in flakes respectively, be superimposed in a mold, high-temperature fusion mould Pressure, obtains the acrylic resin sheet material with Multi-layers distributing, is filled into plate vulcanization machine die, in 135 DEG C of temperature, foaming agent Under butane pressure 2Mpa, saturation 1.8h, 155 DEG C of blowing temperature obtains density 0.075g/cm3Three layers of graded pore structure it is poly- Acryl foam material.
Embodiment 4
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) copolymer polypropylene (Yanshan Petrochemical PP4220), alcohols, nucleating agent and the antioxidant B215 of four kinds of proportionings are weighed, point Feeding is not mixed, and extruded machine extrusion, wire drawing, pelletizing obtain the acrylic resin particle of four kinds of different compositions；
Wherein, alcohols is polyethylene glycol and glycerine (weight ratio 1:3, PEG3000), total addition level be respectively 1.5%, 1.0%th, 0.5%, 0.05%；Nucleating agent is respectively calcium carbonate, white carbon, boric acid, graphene (3000 mesh), and additive amount is respectively 0.05%th, 0.5%, 1.0%, 1.5%；The additive amount of antioxidant is 0.2wt%；
2) the acrylic resin particle of four kinds of different compositions is molded in flakes respectively, be superimposed in a mold, high-temperature fusion mould Pressure, obtains the acrylic resin sheet material with Multi-layers distributing, the reclaimed polypropylene for being superimposed lamellar structure is charged to vulcanizing press mould In tool, in 135 DEG C of temperature, foaming agent N2Under pressure 8Mpa, saturation 0.5h, 140 DEG C of blowing temperature, fast pressure relief obtains density 0.075g/cm3The polypropylene foam with four layers of graded pore structure.
Embodiment 5
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) copolymer polypropylene (Yanshan Petrochemical PP4220), cetomacrogol 1000 and the kaolin of three kinds of proportionings are weighed, respectively Mix feeding, extruded machine is multi-layer co-extruded, wire drawing, pelletizing, obtain three layers distribution acrylic resin particles；
In each proportioning, the amount of cetomacrogol 1000 is respectively 1.0%, 0.2%, 0.05%；Kaolinic amount is respectively 0.01%th, 0.15%, 1.5%；
2) the acrylic resin particle by three layers of distribution is placed in reaction kettle, is passed through pentane as foaming agent, controls kettle internal pressure Power 20Mpa, 130 DEG C of saturation time 2h of temperature, in 140 DEG C of conditions of blowing temperature, fast pressure relief obtains 0.5g/cm3Had Three layers of graded pore structure expanded particle, then add in molding machine by expanded particle, are molded, obtain under water vapor pressure 0.25Mpa To polypropylene foam.
Embodiment 6
The preparation method of polypropylene foam with graded pore structure, includes the following steps：
1) copolymer polypropylene (Yanshan Petrochemical PP4220), Macrogol 600 and the kaolin of three kinds of proportionings are weighed, is mixed respectively Close feeding, extruded machine is multi-layer co-extruded, wire drawing, pelletizing, obtain three layers distribution acrylic resin particles；
In each proportioning, the amount of Macrogol 600 is respectively 8.0%, 1.0%, 0.1%；Kaolinic amount is respectively 0.08%th, 0.16%, 5.0%；
2) the acrylic resin particle by three layers of distribution is placed in reaction kettle, is passed through nitrogen as foaming agent, controls kettle internal pressure Power 2Mpa, 180 DEG C of saturation time 0.5h of temperature, in 145 DEG C of conditions of blowing temperature, fast pressure relief obtains 0.2g/cm3Had There are three layers of graded pore structure expanded particle, expanded particle is then added in into molding machine, be molded, obtain under water vapor pressure 0.3Mpa To polypropylene foam.
Embodiment 7
The preparation method of polypropylene foam with graded pore structure：
Copolymer polypropylene (Yanshan Petrochemical PP4220), cetomacrogol 1000 and the kaolin of three kinds of proportionings are weighed, is mixed respectively Feeding is closed, adds in multi-layer co-extruded equipment, while foaming agent air is passed through into multi-layer co-extruded equipment, multi-layer co-extruded is same Shi Jinhang foams, and obtains polypropylene foam；
In each proportioning, the amount of cetomacrogol 1000 is respectively 1.0%, 0.2%, 0.05%；Kaolinic amount is respectively 0.01%th, 0.15%, 1.5%.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality Example is applied the present invention is described in detail, it for those skilled in the art, still can be to aforementioned each implementation Technical solution recorded in example modifies or carries out equivalent replacement to which part technical characteristic.All essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (10)

1. the preparation method of the polypropylene foam with graded pore structure, which is characterized in that the preparation method is by difference Proportioning weighs polypropylene, alcohols and nucleating agent, is separately added into multi-layer co-extruded equipment, while be passed through into multi-layer co-extruded equipment Foaming agent foams while multi-layer co-extruded, obtains the polypropylene foam with graded pore structure；
Alternatively, the preparation method includes the following steps：
1) polypropylene, alcohols and nucleating agent are weighed by different ratio, through multi-layer co-extruded, wire drawing, pelletizing, obtained with multilayer point The acrylic resin particle of cloth；
Alternatively, weighing polypropylene, alcohols and nucleating agent by different ratio, extruded machine extrusion, wire drawing, pelletizing, obtain more respectively The acrylic resin particle of the different compositions of kind, is molded into sheet material by the acrylic resin particle of different compositions, sheet material is folded respectively Add in a mold, melting molding obtains the acrylic resin sheet material with Multi-layers distributing；
2) the acrylic resin particle with Multi-layers distributing or the acrylic resin sheet material with Multi-layers distributing are foamed, obtained To the polypropylene foam with graded pore structure；
The quality of the nucleating agent weighed accounts for the 0.01%-5% of polypropylene, alcohols and nucleating agent gross mass, and the alcohols is Polyethylene glycol and/or glycerine, the quality of the alcohols weighed are the 0.1%-10% of polypropylene quality weighed.
2. the preparation method of the polypropylene foam according to claim 1 with graded pore structure, which is characterized in that In step 1), while polypropylene, alcohols and nucleating agent is weighed, it is also weighed out additive.
3. the preparation method of the polypropylene foam according to claim 2 with graded pore structure, which is characterized in that The additive is antioxidant, and the quality of antioxidant accounts for the 0.2-0.3% of polypropylene, alcohols and nucleating agent gross mass.
4. the preparation method of the polypropylene foam according to claim 1 with graded pore structure, which is characterized in that In step 1), the polypropylene is homopolypropylene or copolymer polypropylene, the copolymer polypropylene for binary copolymerization polypropylene or Ternary polymerized polypropylene.
5. the preparation method of the polypropylene foam according to claim 1 with graded pore structure, which is characterized in that In step 1), the nucleating agent is talcum powder, calcium carbonate, white carbon, graphene, kaolin, carbon nanotube, zinc borate, cover it is de- One or more mixing in any proportion in soil.
6. the preparation method of the polypropylene foam according to claim 1 with graded pore structure, which is characterized in that In step 1), number of plies n >=3 of the multilayer.
7. the preparation method of the polypropylene foam according to claim 1 with graded pore structure, which is characterized in that In step 2), the foaming is kettle foam or moulded from foam.
8. the preparation method of the polypropylene foam according to claim 7 with graded pore structure, which is characterized in that The foaming is kettle foam, and process is：
Acrylic resin particle with Multi-layers distributing is placed in reaction kettle, is passed through foaming agent, first controls pressure 2- in kettle Then 20Mpa, 125-180 DEG C of temperature, saturation 0.5h-2h melt temperature completely in the acrylic resin particle with Multi-layers distributing Degree obtains density as 0.02g/cm hereinafter, fast pressure relief3-0.5g/cm3Graded pore structure expanded particle, finally will foaming Particle adds in molding machine, is molded under water vapor pressure 0.2-0.3Mpa, obtains polypropylene foam；
The foaming agent is carbon dioxide, one or more in nitrogen, air, butane, pentane.
9. the preparation method of the polypropylene foam according to claim 7 with graded pore structure, which is characterized in that The foaming is moulded from foam, and process is：
Acrylic resin sheet material with Multi-layers distributing is filled into plate vulcanization machine die, first in 130-180 DEG C of temperature, is led to Enter foaming agent, under pressure 2-20Mpa, saturation 0.5-2h so melts temperature completely in the acrylic resin sheet material with Multi-layers distributing For degree hereinafter, fast pressure relief foams, it is 0.02g/cm to obtain density3-0.5g/cm3The polypropylene foam material with graded pore structure Material；
The foaming agent is carbon dioxide, one or more in nitrogen, air, butane, pentane.
10. prepared by the preparation method of the polypropylene foam with graded pore structure described in claim 1-9 any one The polypropylene foam with graded pore structure.
CN201711344078.5A 2017-12-15 2017-12-15 Polypropylene foam material with gradient pore structure and preparation method thereof Active CN108164831B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111251524A (en) * 2020-01-21 2020-06-09 四川大学 Preparation method of gradient porous polymer foam material based on gradient temperature
CN111251524B (en) * 2020-01-21 2021-06-08 四川大学 Preparation method of gradient porous polymer foam material based on gradient temperature
CN114075356A (en) * 2020-08-20 2022-02-22 国家能源投资集团有限责任公司 Polyethylene foam material with gradient pore structure and preparation method and application thereof
CN114075356B (en) * 2020-08-20 2023-09-22 神华(北京)新材料科技有限公司 Polyethylene foam material with gradient pore structure and preparation method and application thereof
CN113201187A (en) * 2021-04-26 2021-08-03 无锡会通轻质材料股份有限公司 Special material for modified polypropylene foaming and preparation method thereof

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