CN115304905B - Buffering and damping shielding foam and preparation method thereof - Google Patents
Buffering and damping shielding foam and preparation method thereof Download PDFInfo
- Publication number
- CN115304905B CN115304905B CN202210950189.5A CN202210950189A CN115304905B CN 115304905 B CN115304905 B CN 115304905B CN 202210950189 A CN202210950189 A CN 202210950189A CN 115304905 B CN115304905 B CN 115304905B
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- parts
- shielding
- foam
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- 239000006260 foam Substances 0.000 title claims abstract description 104
- 230000003139 buffering effect Effects 0.000 title claims abstract description 18
- 238000013016 damping Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 238000011049 filling Methods 0.000 claims abstract description 17
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 14
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 13
- 230000004048 modification Effects 0.000 claims abstract description 12
- 238000012986 modification Methods 0.000 claims abstract description 12
- 239000005058 Isophorone diisocyanate Substances 0.000 claims abstract description 11
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003054 catalyst Substances 0.000 claims abstract description 9
- 239000003381 stabilizer Substances 0.000 claims abstract description 9
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 77
- 239000000839 emulsion Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 11
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 11
- 239000010439 graphite Substances 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- MWYMHZINPCTWSB-UHFFFAOYSA-N dimethylsilyloxy-dimethyl-trimethylsilyloxysilane Chemical class C[SiH](C)O[Si](C)(C)O[Si](C)(C)C MWYMHZINPCTWSB-UHFFFAOYSA-N 0.000 claims description 5
- 238000005187 foaming Methods 0.000 claims description 5
- 229920000058 polyacrylate Polymers 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 5
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 239000004156 Azodicarbonamide Substances 0.000 claims description 3
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 3
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 3
- 229940096992 potassium oleate Drugs 0.000 claims description 3
- MLICVSDCCDDWMD-KVVVOXFISA-M potassium;(z)-octadec-9-enoate Chemical compound [K+].CCCCCCCC\C=C/CCCCCCCC([O-])=O MLICVSDCCDDWMD-KVVVOXFISA-M 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- PBZABDOXEJTBOB-UHFFFAOYSA-N ethyl 3-oxobutanoate;2-methylprop-2-enoic acid Chemical compound CC(=C)C(O)=O.CCOC(=O)CC(C)=O PBZABDOXEJTBOB-UHFFFAOYSA-N 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- -1 methacryloxypropyl trimethoxysilane Acetoacetic acid ethyl ester Chemical compound 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 39
- 230000035939 shock Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 21
- 239000004814 polyurethane Substances 0.000 description 17
- 229920002635 polyurethane Polymers 0.000 description 17
- 239000006185 dispersion Substances 0.000 description 8
- 239000004744 fabric Substances 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 239000000178 monomer Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- YEQBHMVRNHTCPJ-UHFFFAOYSA-N 2-methylprop-2-enoic acid;3-oxobutanoic acid Chemical compound CC(=C)C(O)=O.CC(=O)CC(O)=O YEQBHMVRNHTCPJ-UHFFFAOYSA-N 0.000 description 2
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical group CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000002009 diols Chemical class 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000012360 testing method Methods 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
- 229920000742 Cotton Polymers 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- XYIBRDXRRQCHLP-UHFFFAOYSA-N ethyl acetoacetate Chemical compound CCOC(=O)CC(C)=O XYIBRDXRRQCHLP-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003009 polyurethane dispersion Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 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
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6648—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6651—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/143—Halogen containing compounds
- C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
- C08J9/145—Halogen containing compounds containing carbon, halogen and hydrogen only only chlorine as halogen atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
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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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/06—Polyurethanes from polyesters
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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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the technical field of foam, in particular to a shielding foam for buffering and damping and a preparation method thereof. The shielding foam is prepared from the following raw materials in parts by weight: 15-25 parts of polyester polyol, 8-10 parts of isophorone diisocyanate, 3-5 parts of 2, 2-dimethylolpropionic acid, 0.01-0.05 part of catalyst, 12-16 parts of shielding filling modification material, 0.2-0.4 part of ammonium persulfate, 1-3 parts of dispersing agent, 0.3-0.5 part of foam stabilizer, 1-3 parts of foaming agent, 1-3 parts of ethylenediamine and 10-30 parts of water. The shielding foam of this application has better shielding effect to buffering, shock attenuation are effectual.
Description
Technical Field
The application relates to the technical field of foam, in particular to a shielding foam for buffering and damping and a preparation method thereof.
Background
The foam is foamed material of plastic particles, and is called foam for short. The foam has the characteristics of elasticity, light weight, quick pressure-sensitive fixation, convenient use, free bending, ultrathin volume and the like, so the foam has better buffering and damping effects. Generally, foam is classified into PU foam, antistatic foam, conductive foam, EPE, antistatic EPE, CR, EVA, bridged PE, SBR, EPDM, etc.
The conductive foam has a shielding effect and can realize electromagnetic shielding. The conductive foam can be made of aluminum foil cloth foam, conductive fiber cloth foam, gold-plated cloth foam, carbon-plated cloth foam and other common conductive foam. The conductive foam is coated with conductive cloth on the flame-retardant sponge, and after a series of treatments, the conductive foam has good surface conductivity and can be easily fixed on a device to be shielded by using an adhesive tape. So that the material has good surface conductivity and compressibility, is suitable for realizing electromagnetic shielding in the occasions with narrow space and limited closing pressure, and is widely applied to the fields of PDP televisions, LCD displays, liquid crystal televisions, mobile phones, notebook computers, MP3, communication cabinets, medical instruments, electronic products, military industry, aerospace and the like.
However, the existing conductive foam is obtained by coating the conductive cloth and the foam, so that the conductive foam is easy to loosen and separate when in use, the whole shielding effect is affected, and the conductivity is only on the surface, so that the shielding effect is limited.
Disclosure of Invention
In order to improve the shielding effect of foam, the application provides a buffering and damping shielding foam and a preparation method thereof.
In a first aspect, the present application provides a cushioning and damping shielding foam, which adopts the following technical scheme:
the shielding foam for buffering and damping comprises the following raw materials in parts by weight:
15-25 parts of polyester polyol
8-10 parts of isophorone diisocyanate
3-5 parts of 2, 2-dimethylolpropionic acid
0.01 to 0.05 part of catalyst
12-16 parts of shielding filling modification material
0.2 to 0.4 part of ammonium persulfate
0.3 to 0.5 part of foam stabilizer
1-3 parts of foaming agent
1-3 parts of ethylenediamine
10-30 parts of water.
The shielding foam prepared by the method is integrally formed, does not need to be coated with conductive cloth, saves a coating process, improves production efficiency, has a shielding effect on the whole shielding foam, has a good shielding effect when being applied to the field of electronic products, and can improve the shielding effect of the prepared polyurethane by taking polyester polyol and isophorone diisocyanate as polyurethane polymerization monomers and adding 2, 2-dimethylolpropionic acid and ethylenediamine for chain extension, so that the molecular weight is improved, polyurethane with high elasticity and good buffering property is obtained, and shielding filling modification materials are added. The prepared foam has a good shielding effect.
The polyester polyol is polycarbonate diol, the number average molecular weight of the polyester polyol is 4000-5000, and the polyester polyol is used as a monomer for polyurethane polymerization, so that the prepared polyurethane dispersoid contains more polar groups such as ester groups, amino groups and the like in the molecule, and therefore, the cohesive strength is high, the adhesive force is strong, and the shielding effect is good; the shielding foam used for preparing has the advantages of good wear resistance, shielding effect and the like.
And polyurethane prepared from isophorone diisocyanate is not easy to yellow and has good elasticity. Therefore, the elasticity of shielding foam prepared from polyurethane dispersion is improved, the shielding foam is not easy to yellow, and the obtained foam sponge has good buffering and damping effects.
The catalyst has a good catalytic effect, improves and promotes the polymerization reaction of polyester polyol and isophorone diisocyanate, and takes ammonium persulfate as an initiator, thereby being beneficial to improving the crosslinking of shielding filling modified materials and polyurethane; the foaming agent can play a foaming role, the foam formed by the foam stabilizer is stable and uniform, and the prepared shielding foam has better quality, and the shielding foam is polymerized by various raw materials, is added with shielding filling modified materials, is uniformly dispersed in a raw material system, and is added with other auxiliary agents, so that the prepared shielding foam has better shielding effect, and has better buffering, damping and other effects.
Preferably, the shielding modified slurry is prepared from carbon powder, graphite powder and modified materials in a weight ratio of 1:5-7: 6-8.
Preferably, the modified material comprises the following raw materials in parts by weight:
0.1 to 0.3 part of methacryloxypropyl trimethoxysilane
Acetoacetic acid ethyl ester of methacrylic acid 0.3-0.5 part
Acrylic acid 3-5 parts
EVA emulsion 3-5 parts
3-5 parts of water.
The carbon powder is also called toner, is composed of binding resin, carbon black, charge control agent, external additive and other components, has certain insulativity and conductivity, and the graphite powder is mineral powder, has better performances of chemical stability, high temperature resistance, conductivity and the like, and can play a synergistic effect when being mixed with the toner for use, thereby improving the shielding effect of shielding foam.
Generally, because both carbon powder and graphite powder are not easily compatible with the polymer, the compatibility of the carbon powder, graphite powder and polymer is improved by adding the modifying material.
In the modified material, the methacryloxypropyl trimethoxysilane, the acrylic acid and the methacryloxypropyl trimethoxysilane can be used as cross-linking agents, and can be cross-linked with polyurethane when added into a raw material system of foam sponge, so that the elasticity, the water resistance, the weather resistance, the flexibility and the like of the polyurethane are improved, wherein the methacryloxypropyl trimethoxysilane can improve the compatibility of carbon powder and graphite powder in shielding foam, so that the carbon powder and the graphite powder are uniformly dispersed in the raw material system of the shielding foam, and the shielding effect of the shielding foam is improved.
The solid content of EVA emulsion is 48-52%, and the manufacturer is the America Dow. EVA has low crystallinity and high flexibility, impact resistance, filler compatibility and heat sealing performance due to the introduction of vinyl acetate monomer into molecular chain. Therefore, the EVA emulsion is added to be mixed with the polyurethane raw material, so that the prepared shielding foam has better flexibility and impact resistance, and the buffering effect of the shielding foam is further improved.
Preferably, the carbon powder is conductive carbon powder, and the particle size of the conductive carbon powder is 10-20nm.
The carbon powder with the particle size range can be well dispersed in the shielding modified slurry, so that the shielding effect of shielding foam is improved, and when the particle size is smaller than 10nm, the price is high, the dust is large, and the dust pollution of workshops is easy to cause; when the particle diameter is larger than 20nm, the particle diameter is excessively large, which is disadvantageous for dispersion, resulting in poor shielding effect.
Preferably, the particle size of the graphite powder is 5-30nm.
The graphite with the particle size range can be well dispersed in the shielding modified slurry, so that the shielding effect of shielding foam is improved, and when the particle size is smaller than 5nm, the price is high, the dust is large, and the dust pollution of workshops is easy to cause; when the particle diameter is larger than 30nm, the particle diameter is excessively large, which is disadvantageous for dispersion, resulting in poor shielding effect.
Preferably, the shielding filling modification material comprises the following preparation steps:
weighing 0.1-0.3 part of methacryloxypropyl trimethoxy silane, 0.3-0.5 part of acetoacetic acid ethyl ester methacrylate, 3-5 parts of acrylic acid, 1-3 parts of EVA emulsion and 3-5 parts of water according to weight portions, and uniformly mixing to obtain a modified material, wherein the weight ratio of the modified material to the EVA emulsion is 1:5-7: and 6-8, weighing carbon powder, graphite powder and modified materials, and uniformly mixing to obtain the shielding filling modified materials.
Preferably, the graphite powder is modified graphite powder, and the modified graphite is prepared by the following steps:
step 1: calcining graphite raw material at 280-350 ℃ for 1-2h, cooling, crushing and sieving with 50-100 meshes to obtain a calcined material;
step 2: weighing 2-3 parts by weight of gamma-glycidol ether oxypropyl trimethoxy silane, 0.5-1 part by weight of polyether modified heptamethyltrisiloxane, 0.3-0.5 part by weight of polyacrylate dispersant and 50-70 parts by weight of water, uniformly mixing to obtain a surface modified liquid, weighing 20-30 parts by weight of the calcined material surface modified liquid obtained in the step 2, stirring for 30-50min, heating to 85-90 ℃, drying under reduced pressure, grinding, sieving with a 250-300 mesh sieve, and obtaining modified graphite powder.
The surface tension of graphite is small, the wettability is poor, so that the dispersibility in shielding foam is poor, and further, the graphite raw material is subjected to low-temperature calcination, so that the graphite has better wettability, gamma-glycidyl ether oxypropyl trimethoxysilane is further adopted, better adhesiveness and coupling effect are achieved, the compatibility of the graphite and polymer raw material can be improved, polyether modified heptamethyl trisiloxane (average molecular weight 338.67) has better dispersibility, the dispersibility of the graphite can be improved, a polyacrylate dispersing agent (brand: aisen, model: FLOSPERSE 3000) has better dispersibility, the calcined material can be uniformly dispersed in the surface modification liquid, the dispersion effect of modified graphite powder is better, the modification effect of the modified graphite powder is improved, meanwhile, the modified graphite powder has good dispersibility, and when the modified graphite powder is used for producing shielding foam, the modified graphite powder is uniformly dispersed in a raw material system of the foam, so that the shielding effect of the shielding foam is better.
Preferably, the foaming agent is one or more of dichloromethane, azodicarbonamide foaming agent AC and potassium oleate.
The foaming agent homopolymerization has a good foaming effect, and the foaming agent composed of one or more of dichloromethane, azodicarbonamide foaming agent AC and potassium oleate can uniformly foam the shielding foam.
Preferably, the foam stabilizer is silicone oil L-580.
The brand of the silicone oil L-580 is a Mickey chart, the model is L-580, the silicone oil L-580 has the advantages of small dosage and good foam stabilizing effect, and the foam is stable when the shielding foam is foamed, so that the formed shielding foam has good quality, and simultaneously has a dispersing effect, the dispersibility of a shielding foam raw material system is improved, the raw materials of the shielding foam are uniformly dispersed, and the shielding foam is improved to obtain a good dispersing effect.
In a second aspect, the present application provides a preparation method of a cushioning and damping shielding foam, including the following steps:
weighing polyester polyol and 2, 2-dimethylolpropionic acid, uniformly mixing, heating to 100-120 ℃, and vacuum dehydrating for 1.5-2.0h; cooling to 65 ℃, introducing N2, adding isophorone diisocyanate, dropwise adding a catalyst, heating to 85-90 ℃, reacting for 1.5-2 hours, adding ethylenediamine, reacting for 1-2 hours, adding water, stirring for 10-20 minutes, wherein the stirring speed is 1200-1500r/min, cooling to 75-85 ℃, adding shielding filling modified materials, dropwise adding ammonium persulfate, reacting for 0.5-1 hour, cooling, adding ammonia water to adjust the PH value to 7-8, adding a foaming agent and a foam stabilizer, uniformly mixing to obtain a dispersed material, placing in a mold, heating for solidification, and foaming to obtain shielding foam.
In the preparation method, polyester polyol and 2, 2-dimethylol propionic acid are adopted to carry out heating dehydration, isophorone diisocyanate is added and reacts under the action of a catalyst, the catalyst is N, N-dimethylethanolamine, ethylenediamine is added to carry out chain extension after the reaction is carried out for a certain time, water is added to carry out emulsification, polyurethane emulsion is formed under high shearing, and modified shielding material and ammonium persulfate are added to enable acrylic acid in the shielding filling modification material and molecules grafted to polyurethane to obtain a macromolecular polymer, graphite powder and carbon powder are uniformly dispersed in a raw material system in the process, ammonia water is added to carry out neutralization, and the obtained shielding foam has a good shielding effect after solidification and foaming.
In summary, the present application has the following beneficial effects:
1. according to the polyurethane, polyester polyol and isophorone diisocyanate are used as polyurethane polymerization monomers, 2-dimethylolpropionic acid and ethylenediamine are added for chain extension, the component is improved, polyurethane with high elasticity and good buffering property is obtained, and meanwhile, the shielding filling modification material is added, so that the shielding effect of the prepared polyurethane can be improved. The prepared foam sponge has a good shielding effect.
2. The carbon powder and the graphite powder are preferably adopted in the application, so that the shielding effect of shielding foam can be improved, the methacryloxypropyl trimethoxysilane, the acetoacetate methacrylate, the acrylic acid and the EVA emulsion are added, the compatibility of the carbon powder and the graphite powder with a raw material system of shielding foam can be improved, and meanwhile, the shielding foam can be crosslinked with polyurethane raw materials, so that the prepared shielding foam is good in buffering and damping performances and better in shielding effect.
3. The gamma-glycidoxypropyl trimethoxysilane, polyether modified heptamethyltrisiloxane and polyacrylate dispersant are used for enabling the modified graphite powder to obtain good dispersion performance and compatibility with polymers, enabling the modified graphite powder to be uniformly dispersed in a raw material system of the shielding foam, and improving shielding effect of the shielding foam.
Detailed Description
The present application is described in further detail below with reference to examples.
Examples
Example 1
A shielding foam for buffering and damping comprises the following steps:
weighing 15kg of polyester polyol (polycarbonate diol) and 3kg of 2, 2-dimethylolpropionic acid, uniformly mixing, putting into a polymerization reaction kettle, heating to 110 ℃, and vacuum dehydrating for 1.5 hours, wherein a vacuum meter shows-0.1; cooling to 65 ℃, introducing N2, adding 8kg of isophorone diisocyanate, dropwise adding 0.01kg of catalyst (N, N-dimethylethanolamine), heating to 85 ℃, reacting for 1.5 hours, adding 1kg of ethylenediamine, reacting for 1 hour, adding 10kg of water, stirring for 15 minutes, cooling to 75 ℃ at the stirring rate of 1300r/min, adding 12kg of shielding filling modification material, dropwise adding 0.2kg of ammonium persulfate, reacting for 0.5 hours, cooling, adding ammonia water to adjust the PH value to 7, adding 1kg of foaming agent (dichloromethane) and 0.1kg of foam stabilizer (silicone oil L-580), uniformly mixing to obtain a dispersion material, placing the dispersion material in a mold, heating to 120 ℃ to enable moisture in the dispersion material to be completely evaporated and solidified, and obtaining shielding foam.
A shielding fill modifier comprising the steps of:
weighing 0.1kg of methacryloxypropyl trimethoxysilane, 0.3kg of acetoacetate methacrylate, 3kg of acrylic acid, 1kg of EVA emulsion and 3kg of water, and uniformly mixing to obtain a modified material, wherein the weight (kg) ratio is 1:5: and 6, weighing carbon powder, graphite powder and modified materials, and uniformly mixing to obtain the shielding filling modified materials.
Examples 2 to 3
Examples 2-3 differ from example 1 in that: the amounts of the raw materials used are different, as shown in Table 1;
TABLE 1 raw materials used (kg) for examples 1-3
Example 4
Example 4 differs from example 1 in that the graphite powder used was a modified graphite powder which was merited by the following method:
step 1: placing the graphite raw material into a calciner at 280 ℃ for calcination for 1h, cooling, placing into a pulverizer for pulverization, and sieving with a 50-mesh sieve to obtain a calcined material;
step 2: weighing 2kg of gamma-glycidol ether oxypropyl trimethoxy silane, 0.5kg of polyether modified heptamethyltrisiloxane, 0.3kg of polyacrylate dispersant and 50kg of water, uniformly mixing to obtain a surface modified liquid, weighing 20kg of the calcined material surface modified liquid obtained in the step 2, stirring for 30min, heating to 85 ℃, decompressing and dehydrating, drying in a 50 ℃ oven for 2, grinding in a grinder, and sieving with a 250-mesh sieve to obtain modified graphite powder.
Examples 5 to 6
Examples 5-6 differ from example 4 in that: the amounts of the raw materials used are different, and are shown in Table 2;
TABLE 2 dosage (kg) of modified graphite powder of examples 4-6
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that: the graphite powder is replaced by carbon powder in equal quantity.
Comparative example 2
Comparative example 2 is different from example 1 in that: the carbon powder is replaced by graphite powder in equal quantity.
Comparative example 3
Comparative example 3 is different from example 1 in that: the methacryloxypropyl trimethoxysilane was replaced with acrylic acid in equal amounts.
Comparative example 4
Comparative example 4 differs from example 1 in that: the EVA emulsion was replaced equally with acrylic acid.
Comparative example 5
Comparative example 5 is different from example 1 in that: the shielding sponge is commercially available electronic shielding conductive sponge with the thickness of 5mm.
Performance test
Detection method/test method
1. Rebound Rate
The dispersions of examples 1 to 6 and comparative examples 1 to 5 were cured and foamed to prepare a 5mm shielding foam, which was left for 72 hours and then subjected to the following test, which was conducted with reference to the national standard GB/T6670-1997 "measurement Standard for elastic resilience of flexible polyurethane foam", and the specific data are shown in Table 3.
2. Shielding effect
Referring to SJ20524-1995, "method for measuring Material Shielding effectiveness", shielding foams obtained in examples 1-6 and comparative examples 1-5 were tested for shielding effectiveness at a frequency of 1000MHz, and specific data are shown in Table 3;
TABLE 3 experimental data for examples 1-6 and comparative examples 1-4
| Test item | Rebound Rate (%) | Shielding effectiveness (%) |
| Example 1 | 63 | 93.6 |
| Example 2 | 68 | 94.8 |
| Example 3 | 66 | 94.2 |
| Example 4 | 69 | 97.1 |
| Example 5 | 71 | 97.9 |
| Example 6 | 70 | 97.5 |
| Comparative example 1 | 60 | 83.3 |
| Comparative example 2 | 58 | 88.4 |
| Comparative example 3 | 61 | 91.8 |
| Comparative example 4 | 50 | 92.1 |
| Comparative example 5 | 48 | 90.2 |
From the above table, when modified graphite powder is adopted, the shielding effectiveness of the shielding foam is improved by at least 2.3% (94.8% in example 2 and 97.1% in example 4), which indicates that the modified graphite powder is easy to be fused with the raw material system of the shielding foam; when the graphite powder was replaced with the carbon powder, the shielding effectiveness was reduced by 10.3% (93.6% in example 1 and 83.3% in example 4), whereas when the carbon powder was replaced with the graphite powder, the shielding effectiveness was reduced by 5.2% (93.6% in example 1 and 83.3% in example 4), which means that when the graphite powder and the carbon powder were added at the same time, a synergistic effect was achieved and the shielding effect of the shielding foam was improved.
When the methacryloxypropyl trimethoxy silane is replaced by acrylic acid, the shielding effect is reduced, which means that the dispersibility of carbon powder and graphite powder in a polymer can be improved by adding the methacryloxypropyl trimethoxy silane, so that the shielding effect of the prepared shielding foam is better, and when the EVA emulsion is replaced by acrylic acid, the rebound rate of the shielding foam is reduced, which means that the buffering and damping effects of the shielding foam can be improved by adding the EVA emulsion.
As can be seen from comparative examples 1-6 and comparative example 5, the rebound rate and shielding effectiveness of the commercially available shielding conductive cotton are lower than those of the shielding foam of the present application, which indicates that the shielding foam prepared by the present application has better buffering and damping effects and shielding effects.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (8)
1. The shielding foam for buffering and damping is characterized by being prepared from the following raw materials in parts by weight:
15-25 parts of polyester polyol
8-10 parts of isophorone diisocyanate
3-5 parts of 2, 2-dimethylolpropionic acid
0.01 to 0.05 part of catalyst
12-16 parts of shielding filling modification material
Ammonium persulfate 0.2-0.4 parts
0.3 to 0.5 part of foam stabilizer
1-3 parts of foaming agent
1-3 parts of ethylenediamine
10-30 parts of water;
the shielding filling modified material is prepared from carbon powder, graphite powder and modified materials in a weight ratio of 1:5-7:6-8 parts;
the modified material comprises the following raw materials in parts by weight:
0.1 to 0.3 part of methacryloxypropyl trimethoxysilane
Acetoacetic acid ethyl ester of methacrylic acid 0.3-0.5 part
Acrylic acid 3-5 parts
EVA emulsion 3-5 parts
3-5 parts of water;
the solid content of EVA emulsion is 48-52%.
2. The cushioning, shielding foam of claim 1, wherein: the carbon powder is conductive carbon powder, and the particle size of the conductive carbon powder is 10-20nm.
3. The cushioning, shielding foam of claim 1, wherein: the particle size of the graphite powder is 5-30nm.
4. A cushioning, shielding foam according to any one of claims 1-3, wherein: the shielding filling modification material comprises the following preparation steps:
weighing 0.1-0.3 part of methacryloxypropyl trimethoxy silane, 0.3-0.5 part of acetoacetic acid ethyl ester methacrylate, 3-5 parts of acrylic acid, 1-3 parts of EVA emulsion and 3-5 parts of water according to weight portions, and uniformly mixing to obtain a modified material, wherein the weight ratio of the modified material to the EVA emulsion is 1:5-7: and 6-8, weighing carbon powder, graphite powder and modified materials, and uniformly mixing to obtain the shielding filling modified materials.
5. The cushioning, shielding foam of claim 1, wherein: the graphite powder is modified graphite powder, and the modified graphite powder is prepared by the following steps:
step 1: calcining graphite raw material at 280-350 ℃ for 1-2h, cooling, crushing and sieving with 50-100 meshes to obtain a calcined material;
step 2: weighing 2-3 parts by weight of gamma-glycidol ether oxypropyl trimethoxy silane, 0.5-1 part by weight of polyether modified heptamethyltrisiloxane, 0.3-0.5 part by weight of polyacrylate dispersant and 50-70 parts by weight of water, uniformly mixing to obtain a surface modified liquid, weighing 20-30 parts by weight of the calcined material surface modified liquid obtained in the step 2, stirring for 30-50min, heating to 85-90 ℃, carrying out reduced pressure dehydration, drying for 2-3h, grinding, and sieving with a 250-300 mesh sieve to obtain modified graphite powder.
6. The cushioning, shielding foam of claim 1, wherein: the foaming agent is one or more of dichloromethane, azodicarbonamide foaming agent AC and potassium oleate.
7. The cushioning, shielding foam of claim 1, wherein: the foam stabilizer is silicone oil L-580.
8. A method for preparing the cushioning and damping shielding foam according to any one of claims 1-7, which is characterized in that: the method comprises the following steps:
weighing polyester polyol and 2, 2-dimethylolpropionic acid, uniformly mixing, heating to 100-120 ℃, and vacuum dehydrating for 1.5-2.0h; cooling to 65-75 ℃, introducing N2, adding isophorone diisocyanate, dropwise adding a catalyst, heating to 85-90 ℃, reacting for 1.5-2 hours, adding ethylenediamine, reacting for 1-2 hours, adding water, stirring for 10-20 minutes, wherein the stirring speed is 1200-1500r/min, cooling to 75-85 ℃, adding shielding filling modified materials, dropwise adding ammonium persulfate, reacting for 0.5-1 hour, cooling, adding ammonia water to adjust the pH value to 7-8, adding a foaming agent and a foam stabilizer, uniformly mixing to obtain a dispersed material, placing in a mold, heating for solidification, and foaming to obtain shielding foam.
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| CN113321781A (en) * | 2021-05-28 | 2021-08-31 | 玖龙智能包装(东莞)有限公司 | Pressure-resistant heat-insulating material, preparation method thereof and corrugated case |
| CN114774032A (en) * | 2022-05-11 | 2022-07-22 | 广东思泉新材料股份有限公司 | Buffer and shock-absorbing heat dissipation foam and preparation method thereof |
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| JP2004002567A (en) * | 2002-05-31 | 2004-01-08 | Nitta Ind Corp | Foamed body for shielding electromagnetic wave |
| CN107099017A (en) * | 2017-05-09 | 2017-08-29 | 东莞市普力达光学材料科技有限公司 | High density polyurethane foam and preparation method thereof and foam tape |
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