CN110549707A - Foamed polypropylene composite sheet and preparation method thereof - Google Patents
Foamed polypropylene composite sheet and preparation method thereof Download PDFInfo
- Publication number
- CN110549707A CN110549707A CN201910759338.8A CN201910759338A CN110549707A CN 110549707 A CN110549707 A CN 110549707A CN 201910759338 A CN201910759338 A CN 201910759338A CN 110549707 A CN110549707 A CN 110549707A
- Authority
- CN
- China
- Prior art keywords
- foaming
- polypropylene
- layer
- composite sheet
- composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- -1 polypropylene Polymers 0.000 title claims abstract description 133
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 128
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 125
- 239000002131 composite material Substances 0.000 title claims abstract description 120
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000010410 layer Substances 0.000 claims abstract description 140
- 238000005187 foaming Methods 0.000 claims abstract description 132
- 239000012792 core layer Substances 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 12
- 229920000728 polyester Polymers 0.000 claims abstract description 6
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 4
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 4
- 229920000098 polyolefin Polymers 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 95
- 239000000203 mixture Substances 0.000 claims description 39
- 239000002994 raw material Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 24
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 22
- 239000002243 precursor Substances 0.000 claims description 22
- 229960000892 attapulgite Drugs 0.000 claims description 18
- 229910052625 palygorskite Inorganic materials 0.000 claims description 18
- 238000001125 extrusion Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 229910017059 organic montmorillonite Inorganic materials 0.000 claims description 14
- 239000002202 Polyethylene glycol Substances 0.000 claims description 13
- 238000013329 compounding Methods 0.000 claims description 13
- 229920001223 polyethylene glycol Polymers 0.000 claims description 13
- 102220040412 rs587778307 Human genes 0.000 claims description 13
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 239000010456 wollastonite Substances 0.000 claims description 5
- 229910052882 wollastonite Inorganic materials 0.000 claims description 5
- 239000002313 adhesive film Substances 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 2
- 229920006150 hyperbranched polyester Polymers 0.000 claims description 2
- GQYIWUVLTXOXAJ-UHFFFAOYSA-N Lomustine Chemical compound ClCCN(N=O)C(=O)NC1CCCCC1 GQYIWUVLTXOXAJ-UHFFFAOYSA-N 0.000 claims 4
- 229960002247 lomustine Drugs 0.000 claims 4
- 238000005453 pelletization Methods 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000012855 volatile organic compound Substances 0.000 abstract description 17
- 238000001179 sorption measurement Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 10
- 239000007789 gas Substances 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract 1
- 239000010954 inorganic particle Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 19
- 238000010030 laminating Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 238000001291 vacuum drying Methods 0.000 description 14
- 238000003490 calendering Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 239000006260 foam Substances 0.000 description 8
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000004088 foaming agent Substances 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000013012 foaming technology Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000012745 toughening agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 210000003855 cell nucleus Anatomy 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000009643 growth defect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 210000004940 nucleus Anatomy 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- 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
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- 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
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- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- 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
- C08J9/0066—Use of inorganic compounding ingredients
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- 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
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/025—Polyolefin
-
- 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
- C08J2203/06—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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
-
- 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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- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- 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)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a foamed polypropylene composite sheet and a preparation method thereof, wherein the sheet sequentially comprises the following components from outside to inside: the toughening layer comprises crosslinked foaming polypropylene of which the surface is compounded with a thermoplastic elastomer or polyvinyl chloride; a reinforcing layer comprising a polyester/polyolefin/organo montmorillonite composite; the core layer comprises a foaming composite material with the foaming ratio of 2-5 times; the thickness of the composite sheet is 4-6 mm, and the flexural modulus is 1100-1400 MPa. The foamed polypropylene composite sheet still keeps higher bending strength in the process of improving the foaming multiplying power, and the inorganic particles with high specific surface and high surface activity are added into the composite sheet, so that the product has certain adsorption capacity on harmful gases, the aim of reducing VOC (volatile organic compounds) release is fulfilled, and the foamed polypropylene composite sheet is suitable for popularization and use.
Description
Technical Field
the invention belongs to the technical field of materials, and particularly relates to a foamed polypropylene composite sheet and a preparation method thereof.
background
In recent years, with the development of polypropylene modified materials, the physical mechanical properties and the processability of the polypropylene modified materials are greatly improved, and the polypropylene modified materials are widely applied to automotive interiors. The comprehensive performance of the supercritical physical foaming polypropylene is higher than that of the commercialized PE/PS/PU foaming material at present, the supercritical physical foaming polypropylene is a preferable material for simultaneously realizing environmental friendliness and performance guarantee, can replace PS/PE and partial PU foaming materials, is used for manufacturing packaging and mechanical parts, has a great market development space, and becomes a development hotspot of novel functional plastics.
However, the expanded polypropylene material has the defect that the physical strength (particularly rigidity) is sharply reduced along with the increase of the expansion ratio, and the application of the expanded polypropylene material in mechanical parts such as automotive upholsteries is limited. The relation between the flexural modulus Ec and the bulk modulus Ea of the material isWhereinThe volume fraction of the foam pores in the foaming material is shown, n is a modification coefficient of the foam pore form, n is more than 1 and less than 2, the intrinsic modulus 1500MPa of polypropylene is taken as a reference, when the foaming multiplying power is 3 times and n is 2, the modulus of the foaming polypropylene is reduced to 550MPa and is only slightly higher than 300MPa of PE foam, and the application range of the foaming polypropylene is greatly limited.
In addition, when the polypropylene modified material is synthesized and formed from raw materials, especially when the polypropylene modified material is used in a composite manner, volatile organic compounds (TVOC) such as hydrocarbons, benzenes, aldehydes and amines can be generated in the aging process, which is harmful to human health, so that the raw materials and the processing technology need to be controlled.
chinese patent with application number 201510776113.5 discloses a special low-VOC (volatile organic compound) polypropylene composite material for soft touch automotive interior trim, which comprises the following components in percentage by mass: polypropylene resin: 44-72.5%; a toughening agent: 5-10%; soft touch modifier: 5-10%; talc powder: 15-30%; odor absorbent: 1-3%; weather resistant agent: 0.5-1%; antioxidant: 0.5-1%; dispersing agent: 0.5 to 1 percent. The low VOC polypropylene resin, the toughening agent, the soft touch modifier and the talcum powder are used as main components, the odor absorbent, the weather resistant agent, the antioxidant and the dispersing agent are added, the proportion of various materials is controlled, extrusion granulation is carried out, products with low VOC and soft touch feeling are obtained, and the compound can be widely applied to automobile interior parts such as instrument panels, upright posts, glove boxes, door panels and the like. However, in the invention, the foamed polypropylene is not used as a matrix material, and the components are only subjected to a process of mixing and granulating, so that the effects of light weight and high specific strength of the foamed polypropylene cannot be enhanced.
The chinese patent with application number 201810791650.0 discloses a PVC-PP foamed composite material, which comprises from bottom to top in sequence: a foam layer: the foam layer is a polypropylene foam layer; horny layer: the horny layer comprises the following components in parts by weight: PVC resin powder: 30-45 parts of a solvent; a stabilizer: 1-3 parts; plasticizer: 1-5 parts; foaming agent: 2-6 parts; flame retardant: 0.5-3 parts; the cuticle and the foam layer are connected by adopting an adhesive; surface layer: the surface layer is a water-based polycarbonate polyurethane treating agent. The PVC-PP foaming composite material and the preparation method thereof adopt a vacuum forming technology, and the PVC-PP foaming composite material prepared by the method has excellent pattern stereoscopic impression and pattern retentivity, and has the advantages of low odor, low VOC, heat aging resistance, flame retardance and the like, and is long in service life and capable of meeting the application of automotive interior materials. Although the patent uses the foamed polypropylene and the polyvinyl chloride as the composite material, the adjustment of the self-component of the foamed polypropylene is not involved, and how to reduce the VOC cannot be known, and the description of the embodiment only refers to the hydrogen sulfide gas pollution parameter of the composite material, and the VOC can not be reduced due to the use of the plasticizer and the adhesive.
In view of the above, the present invention is particularly proposed.
disclosure of Invention
the invention aims to overcome the defects of the prior art and provide a foamed polypropylene composite sheet and a preparation method thereof, wherein a supercritical fluid foaming technology is utilized, and inorganic powder (with a certain particle size, length-diameter ratio and more active centers) with stronger adsorption effect on TVOC is added into the components of the foamed polypropylene, so that the adsorption of VOC is ensured, and the mechanical property of the foamed polypropylene of a core layer is improved to a certain extent. In addition, the composite sheet also has a reinforcing layer and a toughening layer, so that the comprehensive mechanical property of the sheet is further improved.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a foamed polypropylene composite sheet, which sequentially comprises the following components from outside to inside: the toughening layer comprises crosslinked foaming polypropylene of which the surface is compounded with a thermoplastic elastomer or polyvinyl chloride; a reinforcing layer comprising a polyester/polyolefin/organo montmorillonite composite; the core layer comprises a foaming composite material with the foaming ratio of 2-5 times; the thickness of the composite sheet is 4-6 mm, and the flexural modulus is 1100-1400 MPa.
In the above scheme, polypropylene is intrinsic for reducing foaming processThe influence of modulus, adopts the enhancement layer containing polyester and organic modified montmorillonite to compound with the foamed polypropylene core layer, and improves the overall mechanical property of the sheet. The foaming composite material of the core layer adopts the environment-friendly short-flow supercritical fluid extrusion foaming technology, compared with the traditional method in which Freon and alkane foaming agents are used for foaming, the harm of the foaming agents to the environment in the foaming process is reduced, and simultaneously, as CO is used for foaming2Or N2the gas stripping effect of the gas on TVOC small molecular substances and the rapid exchange effect of the gas and the air in the foaming process eliminate VOC in the finished product of the foaming composite material.
The further scheme of the invention is as follows: the foaming composite material of the core layer is prepared by supercritical foaming of the following raw materials:
In the scheme, the high melt strength polypropylene has a wider processing temperature range compared with the traditional polypropylene, and the melt has excellent anti-sagging performance at a higher temperature and a longer heating time, thereby being beneficial to foaming processes such as extrusion foaming, hollow forming, thermoforming and the like; and high melt strength polypropylene has a higher crystallization temperature and shorter crystallization time, thus allowing the thermoformed article to be demolded at higher temperatures. The supercritical foaming molding adopted by the invention is to inject supercritical carbon dioxide or nitrogen into a special plasticizing device, so that single-phase mixed sol is formed after the gas and the molten raw material are fully and uniformly mixed/diffused, and then the sol is guided into a mold cavity or an extrusion opening mold to generate large pressure drop of the sol, so that the gas is separated out to form a large amount of bubble cores; in the subsequent cooling and forming process, bubble nuclei in the sol continuously grow and are formed, and finally, the micropore foaming plastic product is obtained. The high melt strength polypropylene has higher melt strength and extensional viscosity, the extensional viscosity of the high melt strength polypropylene is increased along with the increase of shear stress and time, the strain hardening behavior promotes the growth and the stability of foam holes, limits the damage of microporous walls, and improves the foaming of polypropylene materials under the action of a supercritical foaming processthe multiplying power reduces and avoids the collapse and shrinkage phenomena, so that the cooled foaming material forms a uniform cellular structure. The uniform cellular structure also ensures that the composite sheet material provided by the invention has the advantage of light weight under the condition of keeping a certain mechanical property, and the density of the composite sheet material is only 0.28-0.31 g/cm3。
The further scheme of the invention is as follows: the particle size of the inorganic powder is 10-50 microns, preferably 25-40 microns, and the length-diameter ratio of the inorganic powder is 5-20: 1, preferably 7-15: 1; the inorganic powder is selected from wollastonite, sericite or attapulgite, and is preferably attapulgite.
In the scheme, the inorganic powder with high major diameter ratio has a needle-shaped crystal structure similar to short fiber, and when the inorganic powder is used as a resin filler, the mechanical property and the dimensional stability of a product can be improved. And because the specific surface area of the wollastonite, the sericite and the attapulgite is larger and has certain polarity, the TVOC generated in the processing and forming process of the composite material can be adsorbed. Wherein the surface of the attapulgite crystal has 3 active adsorption centers, namely oxygen atoms in silicon-oxygen tetrahedrons, water molecules coordinated with magnesium ions at the edges and Si-OH ion groups on the outer surfaces of the tetrahedrons. And residual charges exist in the structure due to the crystal growth defects of the attapulgite, and the defect sites become crystal surface energy gathering points, have high adsorption activity and generally become active centers, so that the attapulgite becomes a polar adsorbent with high surface active center density, and the attapulgite is also the preferred inorganic powder.
The further scheme of the invention is as follows: the hyper-dispersant is selected from high molecular weight modified hyperbranched polyester without volatile components, preferably the Lobotai YY-502 or the Lobotai YY-702, and more preferably the Lobotai YY-502 and the Lobotai YY-702 are compounded in a mass ratio of 1: 2-3.
In the scheme, the high molecular weight hyper-dispersant is modified hyper-branched polyester without volatile components, such as hyper-branched polyester with hydroxyl terminated by isophorone diisocyanate modified lauric acid, part of the end cyano groups are made to be grafted into molecules by silane such as KH550, and end groups capable of anchoring on the surface of inorganic powder are formed; during foaming, according to heterogeneous nucleation theory, cell nuclei are preferentially formed on the surface of the inorganic powder, and the dispersing agent becomes a cell homogenizing agent in situ, so that the dispersing agent has higher efficiency relative to a small molecular weight cell homogenizing agent (such as stearic acid monoglyceride MS), and the cells of a foamed product are smaller and more uniform. The Lobotai YY-502 or YY-702 is a product model produced by Guangzhou Yuntai synthetic materials, Inc.
The further scheme of the invention is as follows: the enhancement layer is made of the following raw materials:
The intrinsic viscosity of the polyethylene terephthalate is 0.6 to 0.8dl/g, preferably 0.65 to 0.7 dl/g.
In the scheme, the polyethylene glycol terephthalate is selected from PET slices produced by Yanshan petrochemical engineering or characterized chemical fiber, the organic montmorillonite is selected from DK7 polymer grade organic soil of a Zhejiang Fenghong new material, and the montmorillonite has unique layered one-dimensional nano-structure characteristic, has designable reactivity among layers and has an ultra-large specific surface area (750 m)2the nanometer structure and the morphological characteristics are different from other two-dimensional and three-dimensional inorganic nanometer particles, and when the nanometer structure and the morphological characteristics are compounded with a polymer, the polymer material can be endowed with excellent mechanical property and thermal property, and the mechanical property of the foaming composite material is further improved.
The further scheme of the invention is as follows: the type of the polypropylene is selected from T30S or EPS30R, the type of the polypropylene in the foaming composite material of the core layer is EPS30R, and the type of the polypropylene in the raw material of the reinforcing layer is preferably T30S.
In the scheme, the EPS30R polypropylene is impact-resistant polypropylene, and the polypropylene and the high-melt-strength polypropylene are compounded in the core layer, so that the foamed core layer still keeps good flexural modulus and impact resistance; the T30S polypropylene is wire-drawing-grade homopolymerized polypropylene resin, has the characteristics of high tensile strength and low elongation, can replace glass fiber with poor compatibility with resin, and further improves the mechanical strength of the reinforcing layer after being compounded with other raw materials of the reinforcing layer.
The further scheme of the invention is as follows: the compatilizer is selected from one of PP-g-MA, PP-g-GMA, POE-g-MA or POE-g-GMA, and is preferably PP-g-MA or POE-g-MA; the particle size of the organic montmorillonite is 15-25 mu m.
the further scheme of the invention is as follows: the foaming polypropylene is cross-linked foaming polypropylene, and the foaming ratio is 10-30 times, preferably 15-20 times.
The invention also provides a preparation method of the foamed polypropylene composite sheet, which comprises the following steps:
(1) extruding and granulating raw materials of the foaming composite material, and then preparing a core layer sheet by a supercritical fluid extrusion foaming process;
(2) Extruding and granulating the raw materials of the enhancement layer, plasticizing and extruding, and compounding the raw materials on two sides of the core layer sheet obtained in the step (1) to obtain an enhancement sheet;
(3) And (3) coating an adhesive film on the surface of the reinforced sheet obtained in the step (2), and then compounding the toughening layer on the surface of the reinforced sheet through hot pressing of the adhesive film to obtain the foamed polypropylene composite sheet.
In the preparation method, the two surfaces of the core layer sheet are preferably compounded with the reinforced layers respectively, one reinforced layer is selected to be compounded with the toughening layer, and the viscose film is selected from a thermoplastic elastomer POE film.
According to the preparation method, in the step (1), the raw material extrusion granulation of the foaming composite material comprises the following steps: stirring the weighed inorganic powder and the hyperdispersant at a high speed for 5-10 min, adding the weighed polypropylene with high melt strength and the polypropylene into the mixture, stirring the mixture at a low speed for 3-5 min, and extruding and granulating the mixture at 160-240 ℃; in the step (2), the raw material extrusion granulation of the reinforcing layer comprises: the weighed compatilizer, organic montmorillonite and polypropylene raw materials are dried for 2-3 hours in vacuum at 100 ℃, then extruded by a double screw to prepare precursor master batch, then the weighed polyethylene glycol terephthalate is dried for 4-6 hours in vacuum at 70-80 ℃, mixed with the precursor master batch and the like in a high-speed mixer for 5-10 min, and the obtained mixture is extruded and granulated at 180-260 ℃.
In the scheme, the extrusion granulation of the core layer raw material in the step (1) and the extrusion granulation of the enhancement layer raw material in the step (2) both limit the adding sequence and the stirring time of the raw materials, so as to further increase the uniformity of the raw materials, and enable the core layer and the enhancement layer produced subsequently to have better properties.
According to the preparation method, the preparation method specifically comprises the following steps:
(1) stirring weighed inorganic powder and hyperdispersant with the length-diameter ratio of 5-20: 1 and the particle size of 10-50 mu m at a high speed for 5-10 min, adding weighed high-melt-strength polypropylene and general polypropylene into the mixture, stirring the mixture at a low speed for 3-5 min to obtain a mixture, and extruding and granulating the mixture at 160-240 ℃ to obtain the special foaming material, wherein the weight ratio of each component in the special foaming material is as follows:
(2) adding the foaming special material obtained in the step (1) into a supercritical fluid extrusion foaming screw extruder, and accurately injecting CO into a metering section2Controlling the injection amount of the liquid to be 0.3-3% of the special foaming material, so that the foaming ratio of the core layer is 2-5, adjusting the temperature of the extruder to 140-240 ℃, and simultaneously adjusting the pressure to be 7.8-20 MPa to enable CO to be in the range of2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) the method comprises the following steps of (1) drying weighed compatilizers, organic montmorillonite with the particle size of 15-25 mu m and polypropylene at 100 ℃ for 2-3 hours in vacuum, extruding the mixture through a double screw to prepare precursor master batch, drying weighed polyethylene glycol terephthalate with the intrinsic viscosity of 0.6-0.8 dl/g at 70-80 ℃ for 4-6 hours in vacuum, mixing the weighed polyethylene glycol terephthalate with the precursor master batch and the like in a high-speed stirrer for 5-10 minutes to obtain a mixture, and extruding and granulating the mixture at 180-260 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.09-0.11 mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) And (3) coating a layer of POE film with the thickness of 0.03-0.05 mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 4-6 mm.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the core layer adopts high melt strength polypropylene and impact-resistant polypropylene, and is matched with a supercritical foaming process, so that the foaming ratio of the polypropylene material is improved, the collapse and shrinkage phenomena are reduced and avoided, the cooled foaming material forms a uniform cell structure, and the TVOC of the foaming material is reduced to the detection limit;
2. The core layer foaming composite material adopts inorganic powder with a certain length-diameter ratio and adsorption capacity, so that the mechanical property of the core layer foaming polypropylene is improved to a certain extent while the adsorption of VOC is ensured;
3. according to the preparation method of the foaming composite material, the raw materials of the core layer and the reinforcing layer are extruded and granulated in advance, and the raw materials are more uniform by adjusting the adding sequence and the stirring mode of the components, so that the core layer and the reinforcing layer which are produced subsequently have more excellent properties.
The following describes in further detail embodiments of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below, and the following embodiments are used for illustrating the present invention and are not used for limiting the scope of the present invention.
example 1
In this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) The weighed attapulgite with the length-diameter ratio of 5:1 and the particle size of 30 mu m and the Lobotai YY-502 are stirred at a high speed for 10min, then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min, the mixture is obtained and extruded and granulated at 240 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) Adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2controlling the injection amount of the liquid to be 3 percent of the special foaming material and the foaming ratio to be 5, adjusting the temperature of the extruder to 140 ℃, and simultaneously adjusting the pressure to be 8.0MPa to ensure that CO is introduced2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Vacuum drying PP-g-MA, organic montmorillonite with the particle size of 25 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.8dl/g at 80 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 10 minutes to obtain a mixture, extruding and granulating at 260 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.11mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) and (3) coating a layer of POE film with the thickness of 0.03mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 4 mm.
Example 2
in this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) the weighed attapulgite with the length-diameter ratio of 7:1 and the particle size of 10 mu m and the Lobotai YY-702 are stirred at a high speed for 5min, then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 3min, the mixture is obtained and extruded and granulated at 220 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) Adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2Controlling the injection amount of liquid to be 3% of the special foaming material and the foaming ratio to be 5 times, adjusting the temperature of the extruder to 240 ℃, and simultaneously adjusting the pressure to be 20MPa to ensure that CO is introduced2In supercritical state, and through temperature and pressure balance, the mixture is foamed in a foaming moldThe forming is realized in the die, the foaming is carried out at the die orifice, and the foaming sheet enters a laminating machine head for strengthening and stiffening after cooling, rolling and traction;
(3) vacuum drying POE-g-MA, organic montmorillonite with the particle size of 15 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.6dl/g at 70 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 5 minutes to obtain a mixture, extruding and granulating at 210 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.09mm, and guiding the sheets of the composite core layer and the enhancement layer into a toughening layer composite machine head after cooling;
(5) and (3) coating a layer of POE film with the thickness of 0.05mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 4 mm.
Example 3
In this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) the weighed wollastonite with the length-diameter ratio of 18:1 and the particle size of 50 mu m and the hyperdispersant of the Robotai YY-502 and YY-702 (the ratio is 1:3) are stirred at a high speed for 10min, then the weighed high melt strength polypropylene and EPS30R polypropylene are added and stirred at a low speed for 5min, the mixture is obtained and extruded and granulated at 230 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2controlling the injection amount of liquid to be 0.3 percent of the special foaming material and the foaming ratio to be 2, adjusting the temperature of the extruder to 170 ℃, and simultaneously adjusting the pressure to be 12.5MPa to ensure that CO is introduced2the foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Weighing POE-g-GMA, organic montmorillonite with the particle size of 20 mu m and T30S polypropylene, drying for 2-3 hours in vacuum at 100 ℃, then extruding by a double screw to prepare precursor master batch, drying weighed polyethylene glycol terephthalate with the intrinsic viscosity of 0.65dl/g in vacuum at 75 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 7.5 minutes to obtain a mixture, extruding and granulating at 210 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.1mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) and (3) coating a layer of POE film with the thickness of 0.04mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 5 mm.
Example 4
in this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) the weighed wollastonite with the length-diameter ratio of 15:1 and the particle size of 25 mu m and the hyperdispersant of the Robotai YY-502 and YY-702 (the ratio is 1:2) are stirred at a high speed for 10min, then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min, the mixture is obtained and extruded and granulated at 160 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2Controlling the injection amount of the liquid to be 2.1 percent of the special foaming material and the foaming ratio to be 4, adjusting the temperature of the extruder to 145 ℃, and simultaneously adjusting the pressure to be 8.2MPa to ensure that CO is introduced2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Vacuum drying PP-g-GMA, organic montmorillonite with the particle size of 20 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.7dl/g at 75 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 7.5 minutes to obtain a mixture, extruding and granulating at 180 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.1mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) And (3) coating a layer of POE film with the thickness of 0.04mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 6 mm.
example 5
In this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) The weighed sericite with the length-diameter ratio of 20:1 and the particle size of 40 mu m, and the hyperdispersant of the Robotia Y-502 and YY-702 (the ratio of 1:2.5) are stirred at a high speed for 10min, and then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min to obtain a mixture, and the mixture is extruded and granulated at 200 ℃ to obtain the special foaming material, wherein the special foaming material comprises the following components in parts by weight:
(2) Adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting N into a metering section2controlling the injection amount of the liquid to be 3 percent of the special foaming material and the foaming ratio to be 5, adjusting the temperature of the extruder to 210 ℃, and simultaneously adjusting the pressure to be 15MPa to ensure that N is added2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Vacuum drying PP-g-MA, organic montmorillonite with the particle size of 20 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.65dl/g at 75 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 7.5 minutes to obtain a mixture, extruding and granulating at 190 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.1mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) And (3) coating a layer of POE film with the thickness of 0.04mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 6 mm.
Example 6
In this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) The weighed attapulgite with the length-diameter ratio of 5:1 and the particle size of 30 mu m and the Lobotai YY-502 are stirred at a high speed for 10min, then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min, the mixture is obtained and extruded and granulated at 240 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2controlling the injection amount of the liquid to be 3% of the special foaming material and the foaming ratio to be 5, adjusting the temperature of the extruder to 140 ℃, and simultaneously adjustingThe pressure is 8.0MPa, so that CO is generated2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) vacuum drying PP-g-MA, organic montmorillonite with the particle size of 25 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.8dl/g at 80 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 10 minutes to obtain a mixture, extruding and granulating at 260 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.11mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) And (3) coating a layer of POE film with the thickness of 0.03mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 4 mm.
Example 7
in this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) The weighed attapulgite with the length-diameter ratio of 5:1 and the particle size of 30 mu m and the Lobotai YY-502 are stirred at a high speed for 10min, then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min, the mixture is obtained and extruded and granulated at 240 ℃ to obtain the special foaming material, and the special foaming material comprises the following components in parts by weight:
(2) adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2controlling the injection amount of the liquid to be 3 percent of the special foaming material and the foaming ratio to be 5, adjusting the temperature of the extruder to 140 ℃, and simultaneously adjusting the pressure to be 8.0MPa to ensure that CO is introduced2The foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Vacuum drying PP-g-MA, organic montmorillonite with the particle size of 25 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.8dl/g at 80 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 10 minutes to obtain a mixture, extruding and granulating at 260 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) Guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.11mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) and (3) coating a layer of POE film with the thickness of 0.03mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 4 mm.
Example 8
In this example, the following method and components were used to prepare a foamed polypropylene composite sheet:
(1) the weighed attapulgite with the length-diameter ratio of 15:1 and the particle size of 35 mu m, and the hyperdispersant of the Robotai YY-502 and YY-702 (the ratio is 1:2.5) are stirred at a high speed for 10min, and then the weighed polypropylene with high melt strength and the EPS30R polypropylene are added and stirred at a low speed for 5min, so that a mixture is obtained, and the mixture is extruded and granulated at the temperature of 200 ℃ to obtain the special foaming material, wherein the special foaming material comprises the following components in parts by weight:
(2) Adding the special foaming material obtained in the step (1) into a supercritical foaming screw extruder, and accurately injecting CO into a metering section2Controlling the injection amount of liquid to be 3% of the special foaming material and the foaming ratio to be 5, adjusting the temperature of the extruder to 150 ℃, and simultaneously adjusting the pressure to be 9.0MPa to ensure that CO is introduced2the foaming sheet is in a supercritical state, is molded in a foaming mold and is foamed at a mold opening after temperature and pressure balance, and enters a laminating machine head for rigidity enhancement after cooling, rolling and traction;
(3) Vacuum drying POE-g-MA, organic montmorillonite with the particle size of 20 mu m and T30S polypropylene at 100 ℃ for 2-3 hours, extruding by a double screw to prepare precursor master batch, vacuum drying polyethylene glycol terephthalate with the weighed intrinsic viscosity of 0.65dl/g at 75 ℃ for 4-6 hours, mixing with the precursor master batch and the like in a high-speed stirrer for 7.5 minutes to obtain a mixture, extruding and granulating at 190 ℃ to obtain the special material for the enhancement layer, wherein the weight ratio of each component in the special material for the enhancement layer is as follows:
(4) guiding the core layer prepared in the step (2) into a double roller of a double-layer laminating machine head through a guide roller, plasticizing and extruding the special material for the enhancement layer prepared in the step (3) into the double roller, adjusting the rotating speed of the double roller and the gap between the double rollers, controlling the composite thickness of the enhancement layer on the surface of the core layer to be 0.1mm, cooling the sheets of the composite core layer and the enhancement layer, and guiding the sheets into a toughening layer composite machine head;
(5) and (3) coating a layer of POE film with the thickness of 0.04mm on the surface of the composite sheet prepared in the step (4), meanwhile, guiding the toughening layer to the surface of the sheet coated with the POE composite layer through a guide roller, performing double-roller calendering treatment, and thermally compounding the toughening layer on the surface of the sheet coated with POE to prepare the foamed polypropylene composite sheet with the thickness of 5 mm.
example 9
In this example, on the basis of example 8, the composition of the core layer raw material in step (1) is adjusted as follows:
The other embodiments of this example are the same as example 8.
example 10
In this example, on the basis of example 8, the composition of the core layer raw material in step (1) is adjusted as follows:
the other embodiments of this example are the same as example 8.
Example 11
In this example, on the basis of example 8, the composition of the core layer raw material in step (1) is adjusted as follows:
the other embodiments of this example are the same as example 8.
example 12
In this example, on the basis of example 8, the composition of the core layer raw material in step (1) is adjusted as follows:
The other embodiments of this example are the same as example 8.
Example 13
In this example, the aspect ratio of the attapulgite in the step (1) was adjusted to 5:1 in addition to example 8, and other embodiments of this example were the same as example 8.
example 14
in this example, the aspect ratio of the attapulgite in the step (1) was adjusted to 7:1 in addition to example 8, and other embodiments of this example were the same as example 8.
example 15
In this example, the aspect ratio of the attapulgite in the step (1) was adjusted to 11:1 in addition to example 8, and other embodiments of this example were the same as example 8.
example 16
in this example, the aspect ratio of the attapulgite in the step (1) was adjusted to 20:1 in addition to example 8, and other embodiments of this example were the same as example 8.
Comparative example 1
This comparative example is based on example 8 and is otherwise the same as example 8 except that the hyperdispersant in step (1) was removed.
Comparative example 2
In this comparative example, the inorganic powder in step (1) was removed from example 8, and the other embodiments of this example were the same as example 8.
Comparative example 3
in the comparative example, on the basis of example 8, the raw materials of the core layer in the step (1) are directly mixed and stirred at a high speed for 10min, and then extruded and granulated at 200 ℃ to obtain the special foaming material, and other embodiments of the present example are the same as those of example 8.
Comparative example 4
In this comparative example, on the basis of example 8, the raw material of the reinforcing layer in step (3) is dried, directly mixed and stirred at a high speed for 7.5min, and then extruded and granulated at 190 ℃ to obtain the special material for the reinforcing layer, and other embodiments of this example are the same as example 8.
test example 1
The performance of the foamed polypropylene composite sheets of examples 1 to 16 and comparative examples 1 to 4 of the present application was measured, wherein the flexural modulus was measured by a method described in GB/T9341-2008 determination of flexural properties of plastics, the TVOC was measured by a method described in GB/T27630-2011 guideline for evaluating the quality of air in a vehicle, and the notched impact strength was measured by a method described in GB/T1043.1-2008 determination of impact properties of plastic simple beams, and the results are shown in the following table:
As can be seen from the above table, in examples 1 to 16 of the present application, since the supercritical extrusion foaming process is adopted and the inorganic powder with adsorption capacity is introduced into the foamed composite material, the finally prepared foamed polypropylene composite sheet has extremely low VOC. The TVOC test value in comparative example 1 is higher because the core layer raw material in comparative example 1 does not use a specific hyper-dispersant, so that the inorganic powder is agglomerated during the mixing process, and the adsorption effect on VOC is reduced. In comparative example 2, although the components in the raw material can be uniformly mixed by using the hyper-dispersant, the adsorption effect on VOC is greatly weakened due to the removal of the inorganic powder, so that the TVOC test value is high. In addition, the flexural modulus of comparative examples 1 and 2 is reduced compared with that of example 8, and the reason for this is that the inorganic powder is partially agglomerated due to the lack of the hyperdispersant in comparative example 1, and the mechanical strength is partially affected, while the flexural modulus of comparative example 2 is obviously reduced because the inorganic powder has the effect of enhancing the mechanical properties of the foam material, and the mechanical properties are obviously reduced due to the removal of the inorganic powder. In addition, the density of the sheet prepared in comparative example 1 was high because the inorganic powder was not uniformly distributed because the hyperdispersant was not added, and therefore, the density of some samples was large during sampling calculation, and correspondingly, the density of the other portions of the samples was small, indicating the importance of the hyperdispersant in the dispersion of the inorganic powder.
further, comparative examples 3 and 4 are based on direct mixing in the preparation of the raw materials for the core layer and the reinforcing layer, and are not prepared according to the addition sequence and mixing method of the components described in the present invention, so that the mechanical properties of the core layer and the reinforcing layer are reduced, and the adsorption effect of VOC and the notch impact strength are affected.
although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A foamed polypropylene composite sheet is characterized by comprising the following components in sequence from outside to inside:
The toughening layer comprises foamed polypropylene of which the surface is compounded with a thermoplastic elastomer or polyvinyl chloride;
a reinforcing layer comprising a polyester/polyolefin/organo montmorillonite composite;
The core layer comprises a foaming composite material with the foaming ratio of 2-5 times;
the thickness of the composite sheet is 4-6 mm, and the flexural modulus is 1100-1400 MPa.
2. The foamed polypropylene composite sheet according to claim 1, wherein the foamed composite material of the core layer is prepared by extrusion foaming of supercritical fluid from the following raw materials:
3. the foamed polypropylene composite sheet according to claim 2, wherein the inorganic powder has a particle size of 10 to 50 μm, preferably 25 to 40 μm, and an aspect ratio of 5 to 20:1, preferably 7 to 15: 1; the inorganic powder is selected from wollastonite, sericite or attapulgite, and is preferably attapulgite.
4. the foamed polypropylene composite sheet according to claim 2, wherein the hyper-dispersant is selected from a high molecular weight modified hyperbranched polyester containing no volatile component, preferably a lomustine YY-502 or a lomustine YY-702, more preferably a composition of the lomustine YY-502 and the lomustine YY-702 in a mass ratio of 1: 2-3.
5. The expanded polypropylene composite sheet according to claim 1, wherein the reinforcing layer is made of:
The intrinsic viscosity of the polyethylene terephthalate is 0.6 to 0.8dl/g, preferably 0.65 to 0.7 dl/g.
6. The expanded polypropylene composite sheet according to claim 2 or 5, wherein the type of the general-purpose polypropylene is selected from T30S or EPS30R, the type of the general-purpose polypropylene in the expanded composite material of the core layer is EPS30R, and the type of the general-purpose polypropylene in the raw material of the reinforcement layer is preferably T30S.
7. The foamed polypropylene composite sheet according to claim 5, wherein the compatibilizer is selected from one of PP-g-MA, PP-g-GMA, POE-g-MA or POE-g-GMA, preferably PP-g-MA or POE-g-MA; the particle size of the organic montmorillonite is 15-25 mu m.
8. the foamed polypropylene composite sheet according to claim 1, wherein the foamed polypropylene is a crosslinked foamed polypropylene, and the expansion ratio is 10 to 30 times, preferably 15 to 20 times.
9. A method for preparing the expanded polypropylene composite sheet according to any one of claims 1 to 8, comprising:
(1) Extruding and granulating raw materials of the foaming composite material to prepare a special foaming material, and then carrying out supercritical fluid extrusion foaming process on the special foaming material to prepare a core layer sheet;
(2) Extruding and granulating the raw material of the enhancement layer to prepare a special material for the enhancement layer, plasticizing and extruding the special material, and compounding the special material on two sides of the core layer sheet obtained in the step (1) to obtain an enhancement sheet;
(3) And (3) coating an adhesive film on the surface of the reinforced sheet obtained in the step (2), and then compounding the toughening layer on the surface of the reinforced sheet through hot pressing of the adhesive film to obtain the foamed polypropylene composite sheet.
10. the method for preparing the expanded polypropylene composite sheet according to claim 9, wherein the step (1) of extruding and pelletizing the raw material of the expanded composite material comprises: stirring the weighed inorganic powder and the hyper-dispersant at a high speed for 5-10 min, adding the weighed high-melt-strength polypropylene and general-purpose polypropylene into the mixture, stirring the mixture at a low speed for 3-5 min, and extruding and granulating the mixture at 160-240 ℃ to prepare the special foaming material; in the step (2), the raw material extrusion granulation of the reinforcing layer comprises: and (2) drying the weighed compatilizer, organic montmorillonite and general polypropylene at 100 ℃ for 2-3 hours in vacuum, extruding by using a double screw to prepare precursor master batch, drying the weighed polyethylene glycol terephthalate at 70-80 ℃ for 4-6 hours in vacuum, mixing with the precursor master batch and the like in a high-speed stirrer for 5-10 min to obtain a mixture, and extruding and granulating at 180-260 ℃ to prepare the special material for the enhancement layer.
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