CN116120623B - Conical microporous polypropylene foaming beads and molded parts thereof - Google Patents
Conical microporous polypropylene foaming beads and molded parts thereof Download PDFInfo
- Publication number
- CN116120623B CN116120623B CN202310302748.6A CN202310302748A CN116120623B CN 116120623 B CN116120623 B CN 116120623B CN 202310302748 A CN202310302748 A CN 202310302748A CN 116120623 B CN116120623 B CN 116120623B
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- Prior art keywords
- polypropylene
- foaming
- beads
- tapered
- expanded beads
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- 239000011324 bead Substances 0.000 title claims abstract description 134
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 118
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 118
- -1 polypropylene Polymers 0.000 title claims abstract description 114
- 238000005187 foaming Methods 0.000 title claims abstract description 83
- 238000000465 moulding Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 38
- 238000002844 melting Methods 0.000 claims description 36
- 230000008018 melting Effects 0.000 claims description 33
- 239000012792 core layer Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 23
- 239000011148 porous material Substances 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 239000002667 nucleating agent Substances 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000011258 core-shell material Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- 239000002134 carbon nanofiber Substances 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000002073 nanorod Substances 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229940103272 aluminum potassium sulfate Drugs 0.000 claims description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 2
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 claims description 2
- 239000004702 low-density polyethylene Substances 0.000 claims description 2
- 239000002070 nanowire Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920000223 polyglycerol Polymers 0.000 claims description 2
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 229920006027 ternary co-polymer Polymers 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 18
- 238000005520 cutting process Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 239000006260 foam Substances 0.000 description 6
- 239000003963 antioxidant agent Substances 0.000 description 5
- 230000003078 antioxidant effect Effects 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 3
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 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 1
- 239000002270 dispersing agent Substances 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
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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
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
-
- 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
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
- C08J9/0076—Nanofibres
-
- 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
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- 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
- 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
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
- C08J9/232—Forming foamed products by sintering expandable particles
-
- 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
- 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
-
- 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
- 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
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
-
- 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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- 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
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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
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a conical microporous polypropylene foaming bead and a molded part thereof. The conical microporous polypropylene foaming beads are provided with a conical hollow micropore penetrating through the foaming beads, and in the steam forming process, water steam can easily enter and stay in the interior of the foaming beads for a long time due to the existence of the conical hollow micropore in the foaming beads, so that sufficient heat is given to the foaming beads. Under the action of hot steam, the expanded beads can be fully expanded in a short pre-pressurizing time, so that the contact area between the beads is increased, the sintering is more complete, and the formed product has a better curing degree. In addition, after the molding is finished, the product is demolded, and because of the existence of the conical hollow micropores, the shrinkage effect generated after the product is cooled is smaller, and the baking and setting time required by the foamed product is shorter, so that the production period can be greatly shortened, and the production efficiency is increased.
Description
Technical Field
The invention relates to a conical microporous polypropylene foaming bead and a molded part thereof, belonging to the field of foaming materials.
Background
Foamed polymer materials are playing an increasingly important role by virtue of their excellent properties such as light weight, buffering, sound insulation, heat insulation and the like. In particular to a polypropylene foaming material which has the performances of ultrahigh foaming multiplying power, extremely light weight, shaped irregular parts, good mechanical property, green and recyclable property and the like, and gradually replaces the traditional foaming materials such as foaming polyurethane, foaming polystyrene, pearl wool and the like in the fields of automobile parts, rail transit, packaging turnover, construction, sports and leisure and the like.
The polypropylene expanded beads are typically molded into articles by steam compression. In order to make the surface of the molded article smooth and full and to have a good degree of fusion between the expanded beads, the expanded beads need to be pre-pressurized for several hours before steam molding. The foaming beads after the pre-pressurizing treatment have certain pressure inside, so that the foaming beads can show better expansibility in the forming process, and the contact area between adjacent beads can be increased, thereby realizing better sintering among the beads. In addition, after the polypropylene foam beads are formed and are separated from the mold, the foam parts shrink and deform under the action of relatively low external temperature. At this time, the foamed article is required to be baked for 4 hours or more in a baking room at about 80 degrees celsius to set the article. In general, although the molding time of polypropylene expanded beads in a steam molding apparatus lasts only a few minutes, the pre-pressurizing time of the expanded beads in the front stage and the baking time of the articles in the rear stage need to last for several hours or even tens of hours, and the total molding cycle is long. Therefore, shortening the pre-pressurizing time of the foaming beads and the baking time of the product are key to improving the production efficiency and increasing the productivity.
Disclosure of Invention
In order to shorten the pre-pressurizing time of polypropylene foaming beads before steam forming and the baking time of foamed products after forming, the invention discloses a conical microporous polypropylene foaming bead and a molded product thereof. The conical microporous polypropylene foaming beads are provided with a conical hollow micropore penetrating through the foaming beads, and in the steam forming process, water steam can easily enter and stay in the interior of the foaming beads for a long time due to the existence of the conical hollow micropore in the foaming beads, so that sufficient heat is given to the foaming beads. Under the action of hot steam, the expanded beads can be fully expanded in a short pre-pressurizing time, so that the contact area between the beads is increased, the sintering is more complete, and the formed product has a better curing degree. In addition, after the molding is finished, the product is demolded, and because of the existence of the conical hollow micropores, the shrinkage effect generated after the product is cooled is smaller, and the baking and setting time required by the foamed product is shorter, so that the production period can be greatly shortened, and the production efficiency is increased.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a conical microporous polypropylene foaming bead is characterized in that each foaming bead is provided with a conical hollow micropore penetrating through the whole foaming bead, the pore diameter of the conical hollow micropore close to one end of the foaming bead is smaller, the pore diameter close to the other end of the foaming bead is larger, and the pore diameter phi of the smaller pore is larger Small hole And the pore diameter phi of the larger pore Macropores are formed Ratio phi of Small hole /φ Macropores are formed From 1:2 to 1:10, more preferably from 1:4 to 1:8, said phi Macropores are formed And the outer diameter phi of the foaming beads Bead particle Ratio phi of Macropores are formed /φ Bead particle 1:1.5 to 1:5, more preferably 1:2 to 1:3.
Further, the foaming bead is in a core-shell structure, the core layer material comprises 90-100 wt% of high-melting-point high-modulus polypropylene, the shell layer material comprises 90-100 wt% of low-melting-point polyethylene/polypropylene blend, the melting point of the high-melting-point high-modulus polypropylene is 130-160 ℃, the bending modulus is 800-1300 MPa, the melting point of the polyethylene/polypropylene blend is 105-125 ℃, and the mass ratio of the core layer material to the shell layer material is 80:20-99:1, more preferably 90:10-99:1.
Further, the high-melting-point high-modulus polypropylene can be homo-polypropylene, co-polypropylene or a mixture of homo-polypropylene and co-polypropylene, wherein the co-polypropylene can be ethylene-propylene binary co-polypropylene, ethylene-propylene-butyl ternary co-polypropylene and the like, and the melt index of the high-melting-point high-modulus polypropylene is 5-10 g/10min. The polypropylene with high melting point and high modulus is selected as a core layer material, so that better heat resistance and rigidity can be provided for the foaming beads, on one hand, in the forming process, the independent foam holes after foaming can be ensured not to be burnt by steam, and on the other hand, after the foaming product is demoulded, the polypropylene has a certain inhibition effect on shrinkage deformation of the product.
Further, the core layer material also comprises 0.01-5wt% of stiffening aid, wherein the stiffening aid can be one or more of carbon nano fiber, carbon nano rod, metal nano wire, metal nano rod, glass fiber and the like, and the length of the stiffening aid is 0.01-1 mu m. In order to avoid the agglomeration of the stiffening aid and influence the stiffening effect, the stiffening aid is treated in the form of supercritical carbon dioxide activation, ultrasonic dispersion preparation of master batch and the like. The rigidity of the polypropylene foaming beads added with the stiffening aid can be further improved, so that the dimensional shrinkage deformation of the molded part after demolding is further reduced, and the baking and shaping treatment time of the part can be further shortened.
Further, the core layer material also comprises 0.01-5wt% of heat conduction auxiliary agent, wherein the heat conduction auxiliary agent can be one or more of polyvinyl alcohol, polyethylene glycol, polyglycerol and aluminum potassium sulfate. The heat conduction auxiliary agent is generally hydrophilic substance, and can assist polypropylene foaming beads to absorb high-temperature steam better in molding, promote the foaming beads to expand further after absorbing heat, increase the bonding area and the welding degree between the beads, and improve the curing degree of the product.
Further, the core layer material further comprises 0.01-2wt% of nucleating agent, wherein the nucleating agent is one or more of calcium carbonate, talcum powder, zinc borate, barium sulfate, sodium chloride and silicon dioxide, and the particle size is 1-20 mu m. The nucleating agent is generally incompatible with the polypropylene base material, promotes the growth of cells at the interface of the nucleating agent and the polypropylene, and plays a role in heterogeneous nucleation. Meanwhile, the nucleating agent also has the functions of reducing foaming pressure and homogenizing cells.
Further, the polyethylene/polypropylene blend is a blend of high density polyethylene, low density polyethylene or linear low density polyethylene and polypropylene, and the melt index is 4-15 g/10min. When steam pressure is applied to the expanded polypropylene beads during the molding process, the lower melting polyethylene/polypropylene blend material shells melt rapidly, the internal molecular chains begin to intertwine, but the core layer high melting polypropylene expanded beads still maintain an intact closed cell structure. During the subsequent cooling process, the shell polyethylene/polypropylene blend is rapidly cooled and the entangled molecular chains are "frozen" instantaneously, macroscopically representing a tight and firm fusion between the beads, resulting in the final molded article.
Further, the core layer material and the shell layer material can also contain a proper amount of lubricant, wherein the lubricant is one or more of polyethylene wax, erucamide, oleamide, butyl stearate, ethylene bis-stearamide, paraffin wax and the like. The lubricant mainly plays roles of reducing the pressure of a machine head and stabilizing the extrusion production process in the process of extruding the resin.
Further, the core layer material and the shell layer material can also contain a proper amount of antioxidant, and the antioxidant is one or more of hindered phenols, hindered amines, phosphites and the like. The antioxidant is helpful for reducing the oxidative yellowing of the foaming beads and prolonging the service life of the foaming product.
As the functional use, the core layer material and the shell layer material may be further added with functional additives such as antistatic agents, flame retardants, color bases, conductive agents, and the like, as needed.
The preparation method of the conical microporous polypropylene foaming beads comprises the following steps:
(1) Uniformly mixing core layer materials of the foaming beads, then, putting the mixture into a double-screw extruder A, uniformly mixing shell layer materials of the foaming beads, and then, putting the mixture into a double-screw extruder B;
(2) The co-extrusion is realized through a double-layer die, the material in the extruder A is used as a core layer, the material in the extruder B is used as a shell layer, and a through hole is formed in the yarn;
(3) The extruded strands were water cooled and pelletized using a hob with small and large cutting edges alternating. The cutting angle of the small-angle cutting edge is usually 20-25 degrees, the incision is sharp, and a larger hole is formed on the surface of the cut particle; the large angle edge typically has an angle of 30-35 deg., the cuts are relatively blunt and the surface of the particles being cut form small holes. The large cutting edge and the small cutting edge are alternately arranged and respectively cut at two ends of the particles, so that the expandable polypropylene particles with the core-shell structure and the conical through holes inside can be prepared;
(4) And (3) putting the expandable polypropylene particles with the core-shell structure and the conical through holes inside into a high-pressure foaming kettle for foaming to obtain the conical microporous polypropylene foaming beads, and integrating the endothermic enthalpy value of a melting peak higher than the inherent melting point in a primary DSC melting curve, wherein the area of the expandable polypropylene particles is 15-30J/g, and more preferably 15-25J/g.
Wherein the melting peak of the intrinsic melting point is an endothermic peak generated by melting of the polypropylene resin in the DSC curve when heated from room temperature to 200 ℃ at a heating rate of 10 ℃/min after the heat history is eliminated. When the expandable polypropylene particles are heated to a high temperature (typically near the melting point temperature) in the reactor, a portion of the originally frozen polypropylene molecular chains are free to move and rearrange neatly to form a more perfect crystalline region. This crystalline region is more perfect than the intrinsic crystalline region of polypropylene and therefore has a higher melting temperature and a melting peak above the intrinsic melting point is formed. After isothermal for a period of time, the expandable polypropylene particles are decompressed and expanded, and the temperature is rapidly cooled. At this time, the polypropylene molecular chain is not completely crystallized, and a part of the molecular chain is cooled and crystallized in the process of cooling, so that a low-temperature peak with a melting point lower than the intrinsic melting point peak is formed.
A foamed polypropylene molded article is obtained by sintering and molding the tapered microporous polypropylene foamed beads by water vapor.
The invention has the following beneficial effects:
a tapered microporous polypropylene expanded bead material is provided, wherein each expanded bead contains tapered hollow micropores extending through the entire expanded bead, and steam can easily enter the inside of the expanded bead through the micropores during steam compression molding. Because the micropores are in a cone shape, the pore diameter of one end is large, the pore diameter of the other end is small, and steam entering the interior of the beads can stay in the interior of the foaming beads for a long time without diffusion and escape, so that the foaming beads can absorb more heat and expand better. The contact area between the expanded beads is increased, the sintering is more perfect, and the curing degree of the product is higher. In this process, the good expansibility of the beads need not be provided by long-time pre-pressurization, and even if the pressure inside the expanded beads is low before steam molding, the pre-pressurization time is short, and the beads can have good expansibility due to the existence of tapered hollow micro-pores.
On the other hand, after the water-cooling demolding of the foaming product, the gas escape amount inside the foam bead cells is small due to the existence of tapered hollow micropores, the gas pressure balance between the inner part and the outer part of the bead is easy to achieve, and the shrinkage of the product is small. And because the raw materials are selected from the polypropylene materials with higher rigidity, the dimensional deformation of the foaming part due to shrinkage can be further inhibited, and the overall required baking and setting time is shorter.
Therefore, the invention greatly shortens the pre-pressurizing time of the foaming beads before molding and the baking time of the molded foaming parts, greatly shortens the production period of the foaming polypropylene parts and greatly improves the production efficiency.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a photograph of a cross section of a tapered microporous polypropylene expanded bead prepared according to the present invention.
FIG. 2 is a photograph of the top surface of a conical microporous polypropylene expanded bead prepared according to the present invention.
FIG. 3 is a photograph of the bottom surface of a conical microporous polypropylene expanded bead prepared according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to examples. Example 1:
preparing conical microporous polypropylene foaming beads:
(1) The high-melting point and high-modulus polypropylene A (melting point 151 ℃, melt index 7g/10min, flexural modulus 1200 MPa), stiffening aid (carbon nanofiber master batch), heat conduction aid (polyvinyl alcohol), nucleating agent (calcium carbonate), lubricant (oleamide) and antioxidant (1010) of the core layer are uniformly mixed according to the component proportion of the embodiment 1 in the table 1, and then are put into a double-screw extruder A, and the polyethylene/polypropylene blend C (melting point 120 ℃, melt index 8g/10 min), lubricant (oleamide) and antioxidant (1010) of the shell layer are uniformly mixed and then are put into a double-screw extruder B;
(2) The co-extrusion is realized through a double-layer die, the material in the extruder A is used as a core layer, the material in the extruder B is used as a shell layer, a through hole is formed in the yarn, and the mass ratio of the core layer to the shell layer is 95:5;
(3) Water-cooling the extruded silk, and granulating the silk by using a hob with alternately arranged large and small cutting edges to prepare expandable polypropylene particles with a core-shell structure and conical through holes, wherein the length of the particles is 1.2-2.5 mm, and the single weight is 0.5-1.8 mg;
(4) Adding expandable polypropylene particles with a core-shell structure and with conical through holes in the interior into a foaming kettle, simultaneously adding dispersing agent butter and surfactant sodium dodecyl sulfate, heating the foaming kettle, introducing carbon dioxide physical foaming agent to enable the foaming agent to permeate into the polypropylene particles to form a homogeneous system, maintaining for 10min when the set foaming temperature and foaming pressure are reached in the reaction kettle, then instantaneously releasing the expandable polypropylene particles to a foaming pipeline with the internal air pressure lower than 0.1MPa and the atmosphere temperature of 80-100 ℃ for foaming expansion, and finally obtaining the conical microporous polypropylene foaming beads after the time of the expandable polypropylene particles in the foaming pipeline is 4-15 s.
Preparing a foamed polypropylene molded article:
the prepared conical microporous polypropylene foaming beads are subjected to air bearing pressure of 0.3MPa for a plurality of hours, then are subjected to steam molding, and are baked and shaped in a drying room at 80 ℃ to finally obtain foaming parts, wherein the technological parameters in the molding process and the performances of the foaming parts are shown in Table 1.
Example 2: a conical microporous polypropylene expanded bead and expanded polypropylene molded article were produced in the same manner as in example 1, except that the polypropylene a in the core layer was replaced with the ordinary polypropylene B (melting point 128 ℃, melt index 7g/10min, flexural modulus 730 MPa) while no stiffening aid (carbon nanofiber master batch) and heat conductive aid (polyvinyl alcohol) were added.
Example 3: tapered microporous polypropylene foam beads and foamed polypropylene molded articles were produced in the same manner as in example 1, except that 7 parts by mass of a stiffening aid (carbon nanofiber master batch) was added to the core layer.
Example 4: tapered microporous polypropylene expanded beads and expanded polypropylene molded articles were produced in the same manner as in example 1, except that 4 parts by mass of a heat conductive additive (polyvinyl alcohol) was added to the core layer.
Comparative example 1: tapered microporous polypropylene expanded beads and expanded polypropylene molded articles were produced in the same manner as in example 1, except that no through-holes were formed in the interior of the strand during extrusion.
Comparative example 2: except for preparing the conical microporous polypropylene foaming beads, the phi of the foaming beads is controlled by adjusting the cutting angles of the large and small cutting angle cutting edges Small hole /φ Macropores are formed Tapered microporous polypropylene expanded beads and expanded polypropylene molded articles were produced in the same manner as in example 1 except that the ratio was 1:1 (i.e., the shape of the micropores of the expanded beads was cylindrical).
Comparative example 3: except for preparing the conical microporous polypropylene foaming beads, the phi of the foaming beads is controlled by adjusting the cutting angles of the large and small cutting angle cutting edges Small hole /φ Macropores are formed A conical microporous polypropylene hair was prepared in the same manner as in example 1 except that the ratio was 1:14 (i.e., the size of the micropores of the conical micropores was too small)Foam beads and expanded polypropylene molded articles.
Comparative example 4: except for preparing the conical microporous polypropylene foaming beads, the phi of the foaming beads is controlled by adjusting the cutting angles of the large and small cutting angle cutting edges Macropores are formed /φ Bead particle Tapered microporous polypropylene expanded beads and expanded polypropylene molded articles were prepared in the same manner as in example 1, except that 1:1.2 (i.e., the macropores of the tapered micropores were oversized).
Comparative example 5: a conical microporous polypropylene expanded bead and an expanded polypropylene molded article were produced in the same manner as in example 1, except that the melting peak endothermic enthalpy value higher than the inherent melting point in the primary DSC melting curve of the conical microporous polypropylene expanded bead was 12.2J/g.
TABLE 1
In table 1, the lowest molding pressure: the minimum vapor sintering pressure required when the number of broken cells of the foamed article is 90% or more of the total number of beads.
Appearance of the foamed article: from good to bad, it is classified into 5 very good, 4 good, 3 general, 2 poor, 1 very poor in turn.
It can be seen from the combination of example 1 and comparative example 1 that when the inside of the expanded polypropylene beads contains tapered micropores, a sufficient internal pressure can be established inside the expanded beads within a short pre-pressing time, so that the expanded beads have a good expansibility in molding, and a product with a good welding degree can be obtained under a low molding pressure. When the inside of the expanded polypropylene beads does not contain tapered micropores, the beads often need longer pre-pressing time to gradually form internal pressure in the inside of the expanded polypropylene beads, the steam pressure required in the forming process is higher, and the formed parts also need longer baking time to form the size.
It can be seen from a combination of examples 1 and 2 that the polypropylene material with a higher modulus of the core layer has a higher shrinkage resistance due to its higher rigidity, and the pre-compression time required before molding and the bake setting time required after molding are shorter.
As can be seen from a combination of examples 1 and 3, the addition of the stiffening aid results in an increased stiffness of the foamed polypropylene conical microporous article and an increased compression pressure at 50% strain of the article; meanwhile, the rigidity is increased, so that the shrinkage resistance of the foaming part after steam molding is enhanced, and the baking and shaping time after molding is shortened.
It can be seen from a combination of examples 1 and 4 that the addition of the heat transfer additive provides the expanded beads with a better ability to absorb the heat of the steam, an increased expansion of the beads, a relatively low steam pressure required and a short pre-compression time required before shaping.
As can be seen from a combination of example 1 and comparative example 2, the expanded beads (i.e.,. Phi.) were expanded with respect to the cylindrical micropores Small hole /φ Macropores are formed =1:1), the foamed beads of the tapered micro-pores have better ability to lock the heat of the steam, i.e. the steam easily enters the inside of the beads from the macro-pores and is not easy to escape due to the effect of the small-pore obstruction. Under the condition of shorter pre-pressing time, the conical micropores enable the foaming beads to expand better, the welding property and curing degree of the product are better, and the production efficiency is improved.
As can be seen from a combination of example 1 and comparative example 3, when the pore size of the tapered micropores of the expanded beads is too small, the process of dicing is difficult to control, and the tapered micropores of a part of the beads are easily blocked during dicing, forming a closed-cell-end structure. At this time, pre-pressing time before the molding of the expanded beads is prolonged, steam pressure in the molding is relatively high, and drying time of molded parts is prolonged.
As can be seen from a combination of example 1 and comparative example 4, when the macropore size of the tapered micropores of the expanded beads is excessively large (greater than v Macropores are formed /φ Bead particle In the range of 1:1.5-1:5), the surface cavities of the foamed part are obvious and influence the aesthetic property of the part although the molding efficiency is higher and the molding period is shorter.
As can be seen from the combination of the example 1 and the comparative example 5, when the high-temperature melting peak endothermic enthalpy value of the foaming beads is 15-30J/g, the foaming beads have better rigidity, and the baking time of the formed products is shorter; however, when the heat absorption enthalpy value of the high-temperature melting peak is less than 15J/g, the material is softer, has insufficient rigidity, has poor shrinkage resistance and requires a long baking time to shape the product.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (12)
1. A conical microporous polypropylene foaming bead is characterized in that each foaming bead is provided with a conical hollow micropore penetrating through the whole foaming bead, the pore diameter of the hollow micropore near one end of the foaming bead is smaller, the pore diameter near the other end of the foaming bead is larger, and the pore diameter phi of the smaller pore is larger Small hole And the pore diameter phi of the larger pore Macropores are formed Ratio phi of Small hole /φ Macropores are formed 1:2-1:10, wherein phi is the sum of the two phases Macropores are formed And the outer diameter phi of the foaming beads Bead particle Ratio phi of Macropores are formed /φ Bead particle 1:1.5-1:5; and integrating the endothermic enthalpy value of a melting peak higher than the inherent melting point in the primary DSC melting curve of the foaming bead, wherein the area is 15-30J/g.
2. The tapered microporous polypropylene expanded beads according to claim 1, wherein Φ Small hole /φ Macropores are formed Is 1:4-1:8.
3. The tapered microporous polypropylene expanded beads according to claim 1, wherein Φ Macropores are formed /φ Bead particle Is 1:2-1:3.
4. The tapered microporous polypropylene expanded beads according to claim 1, wherein the expanded beads have a core-shell structure, the core layer material comprises 90-100 wt% of high-melting-point high-modulus polypropylene, the shell layer material comprises 90-100 wt% of low-melting-point polyethylene/polypropylene blend, the melting point of the high-melting-point high-modulus polypropylene is 130-160 ℃, the flexural modulus is 800-1300 MPa, the melting point of the polyethylene/polypropylene blend is 105-125 ℃, and the mass ratio of the core layer material to the shell layer material is 80:20-99:1.
5. The tapered microporous polypropylene expanded beads according to claim 4, wherein the mass ratio of the core layer material to the shell layer material is 90:10 to 99:1.
6. The tapered microporous polypropylene expanded beads according to claim 4, wherein the high-melting point high-modulus polypropylene is homo-polypropylene, co-polypropylene or a mixture of homo-polypropylene and co-polypropylene, the co-polypropylene is ethylene propylene binary copolymer polypropylene or ethylene propylene butyl ternary copolymer polypropylene, and the high-melting point high-modulus polypropylene has a melt index of 5 to 10g/10min.
7. The tapered microporous polypropylene expanded beads according to claim 4, wherein the core layer material further comprises 0.01-5 wt% of stiffening aid, wherein the stiffening aid is one or more of carbon nanofibers, carbon nanorods, metal nanowires, metal nanorods and glass fibers, and the stiffening aid has a length of 0.01-1 μm.
8. The tapered microporous polypropylene expanded beads according to claim 4, wherein the core layer material further comprises 0.01-5 wt% of a heat conduction auxiliary agent, and the heat conduction auxiliary agent is one or more of polyvinyl alcohol, polyethylene glycol, polyglycerol, and aluminum potassium sulfate.
9. The tapered microporous polypropylene expanded beads according to claim 4, wherein the core layer material further comprises 0.01 to 2wt% of a nucleating agent, the nucleating agent being one or more of calcium carbonate, talc, zinc borate, barium sulfate, sodium chloride, and silica, and the nucleating agent having a particle diameter of 1 to 20 μm.
10. The tapered microporous polypropylene expanded beads according to claim 4, wherein the polyethylene/polypropylene blend is a high density polyethylene, a low density polyethylene or a blend of linear low density polyethylene and polypropylene having a melt index of 4 to 15g/10min.
11. The tapered microporous polypropylene expanded beads according to any one of claims 1 to 10, wherein the expanded beads have an area of 15 to 25J/g by integrating the endothermic enthalpy of the melting peak above the intrinsic melting point in the first DSC melting curve.
12. A foamed polypropylene molded article characterized by being produced by a steam sintering molding process using the tapered microporous polypropylene foamed beads according to any one of claims 1 to 11.
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| JP5727210B2 (en) * | 2010-12-15 | 2015-06-03 | 株式会社ジェイエスピー | Method for producing polyolefin resin expanded particle molded body, and polyolefin resin expanded resin molded body |
| JP6514576B2 (en) * | 2014-07-18 | 2019-05-15 | 株式会社ジェイエスピー | Method for producing surface material coated foamed particle molded body |
| JP2022127578A (en) * | 2021-02-19 | 2022-08-31 | 株式会社ジェイエスピー | Foamed particle and method for producing the same |
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| JP2003335892A (en) * | 2002-03-15 | 2003-11-28 | Jsp Corp | Polypropylene resin expanded particle, its preparation process and in-mold expansion molded product of polypropylene resin |
| JP2006307177A (en) * | 2005-03-29 | 2006-11-09 | Jsp Corp | Polyproylene based resin foam particle, process for production of polyproylene based resin foam particle molded propduct and polyproylene based resin foam particle molded product |
| JP2022096231A (en) * | 2020-12-17 | 2022-06-29 | 株式会社ジェイエスピー | Polypropylene-based resin foam particle, and foam particle molding |
| CN114907608A (en) * | 2021-11-02 | 2022-08-16 | 无锡会通轻质材料股份有限公司 | Expanded polypropylene beads, process for producing the same and molded article |
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