CN117467281A - Liquid foam silicone rubber composition and preparation method of foam silicone rubber elastomer thereof - Google Patents
Liquid foam silicone rubber composition and preparation method of foam silicone rubber elastomer thereof Download PDFInfo
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- CN117467281A CN117467281A CN202210852493.6A CN202210852493A CN117467281A CN 117467281 A CN117467281 A CN 117467281A CN 202210852493 A CN202210852493 A CN 202210852493A CN 117467281 A CN117467281 A CN 117467281A
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- silicone rubber
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- foam silicone
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 106
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 102
- 239000000203 mixture Substances 0.000 title claims abstract description 88
- 229920001971 elastomer Polymers 0.000 title claims abstract description 71
- 239000000806 elastomer Substances 0.000 title claims abstract description 70
- 239000006260 foam Substances 0.000 title claims abstract description 53
- 239000008258 liquid foam Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 185
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 89
- 229920005601 base polymer Polymers 0.000 claims abstract description 87
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000945 filler Substances 0.000 claims abstract description 43
- 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 claims abstract description 33
- 239000003054 catalyst Substances 0.000 claims abstract description 33
- 239000003063 flame retardant Substances 0.000 claims abstract description 33
- 239000003112 inhibitor Substances 0.000 claims abstract description 30
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 29
- 239000004088 foaming agent Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 25
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 24
- 239000012763 reinforcing filler Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- -1 polysiloxane Polymers 0.000 claims description 75
- 229920001296 polysiloxane Polymers 0.000 claims description 67
- 229920002554 vinyl polymer Polymers 0.000 claims description 66
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 24
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- 238000005303 weighing Methods 0.000 claims description 17
- 238000005187 foaming Methods 0.000 claims description 15
- 229910021485 fumed silica Inorganic materials 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- 239000001257 hydrogen Substances 0.000 claims description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 11
- 238000004513 sizing Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 9
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 8
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 7
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 7
- 238000003490 calendering Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 5
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 4
- JQZGUQIEPRIDMR-UHFFFAOYSA-N 3-methylbut-1-yn-1-ol Chemical compound CC(C)C#CO JQZGUQIEPRIDMR-UHFFFAOYSA-N 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- VMAWODUEPLAHOE-UHFFFAOYSA-N 2,4,6,8-tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound C=C[Si]1(C)O[Si](C)(C=C)O[Si](C)(C=C)O[Si](C)(C=C)O1 VMAWODUEPLAHOE-UHFFFAOYSA-N 0.000 claims description 3
- OWRXWSVBJIIORE-UHFFFAOYSA-N 3,7,11-trimethyldodec-1-yn-3-ol Chemical compound CC(C)CCCC(C)CCCC(C)(O)C#C OWRXWSVBJIIORE-UHFFFAOYSA-N 0.000 claims description 3
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052882 wollastonite Inorganic materials 0.000 claims description 3
- 239000010456 wollastonite Substances 0.000 claims description 3
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- BITPLIXHRASDQB-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane Chemical compound C=C[Si](C)(C)O[Si](C)(C)C=C BITPLIXHRASDQB-UHFFFAOYSA-N 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000005909 Kieselgur Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 34
- 210000004027 cell Anatomy 0.000 description 25
- 238000001000 micrograph Methods 0.000 description 19
- 238000010521 absorption reaction Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000011056 performance test Methods 0.000 description 10
- 239000006261 foam material Substances 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000006229 carbon black Substances 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical group CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 229940015975 1,2-hexanediol Drugs 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 239000004944 Liquid Silicone Rubber Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- DDCDEKHXBABHHI-UHFFFAOYSA-N acetylene cyclohexanol Chemical compound C1(CCCCC1)O.C#C DDCDEKHXBABHHI-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical group CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- FHKSXSQHXQEMOK-UHFFFAOYSA-N hexane-1,2-diol Chemical compound CCCCC(O)CO FHKSXSQHXQEMOK-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 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
- C08J9/04—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
- C08J9/142—Compounds containing oxygen but no halogen atom
-
- 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
- C08J9/009—Use of pretreated 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/12—Organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol
-
- 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
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/05—Polysiloxanes containing silicon bound to hydrogen
-
- 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a liquid foam silicone rubber composition and a preparation method of a foam silicone rubber elastomer thereof, wherein the liquid foam silicone rubber composition comprises a component A and a component B in parts by weight: and (3) a component A: base material A, base material B, base material C, structure control agent, foaming agent, base polymer and platinum catalyst; and the component B comprises the following components: base material A, base material B, base material C, base polymer, cross-linking agent and inhibitor; wherein, the base material A consists of a basic polymer, a reinforcing filler and a treating agent D; the base material B consists of a base polymer, a flame-retardant filler and a treating agent E; the base material C consists of a base polymer, a heavy filler and a treating agent F. The foam silicone rubber elastomer is prepared by separately preparing the component A and the component B, mixing the component A and the component B according to the mass part ratio of 1:1, and curing for 10-20 min at the temperature of 45-100 ℃. The liquid foam silicone rubber has good fluidity and process operability, and the foam silicone rubber elastomer obtained after solidification has uniform and fine cell structure, good mechanical property and flame retardant property, and can be widely used in the fields of new energy automobile battery pack cladding, motor car floor support, outdoor communication, sealing and protection of electronic and lighting equipment cabinets and the like.
Description
Technical Field
The invention relates to an organopolysiloxane composition, in particular to a liquid foam silicone rubber composition and a preparation method of a foam silicone rubber elastomer thereof, and belongs to the technical field of high polymer materials.
Background
The foam silicone rubber is a novel porous multifunctional environment-friendly polymer elastomer prepared by the foaming process of the silicone rubber. The silicone rubber foam material not only has the excellent performances of non-toxicity, heat resistance, weather resistance, good electrical insulation and the like of a silicone rubber product, but also has the performances of vibration reduction, damping, sound insulation, heat insulation, sealing, light weight and the like of the foam material, and is widely applied to the fields of national defense, transportation, electronic industry, building decoration, aerospace and the like.
Chinese patent CN105331112a discloses a preparation method of graphene-silicone rubber composite foam material, which comprises the following steps: (1) preparing a composite material of graphene and raw silicone rubber; (2) Mixing the composite material at 100-120 ℃, alternately adding white carbon black and a structure control agent in a batch manner during mixing, continuously mixing for 15-20 min after the addition, removing volatile matters in the obtained mixture, cooling to room temperature, standing for 10-14 h, and adding a vulcanizing agent to mix for 15-30 min at room temperature to obtain a mixed compound; (3) Presulfiding the rubber compound at 120-125 ℃ and forming to form a blank, and placing the blank into a reaction kettle for supercritical carbon dioxide foaming to obtain a presulfided foaming material; and (4) completely vulcanizing the pre-vulcanized foaming material to obtain the polyurethane foam. The method relates to supercritical carbon dioxide foaming technology, equipment cost is high, and when a composite material of graphene and raw silicone rubber is prepared, a large amount of waste liquid is generated by treatment of solvents such as cyclohexane, dichloromethane, tetrahydrofuran, toluene and the like, so that environmental pollution is caused.
Chinese patent CN106433139A discloses a low-density high-pore silicon rubber foam material and a preparation method thereof, 100 parts of silicon rubber, 10-50 parts of reinforcing agent, 1-7 parts of control agent, 200-600 parts of pore-forming agent and 0-5 parts of sensitizer are mixed and molded, then are crosslinked by gamma-ray radiation, and then are subjected to elution and freeze drying to prepare the low-density high-pore silicon rubber foam material. The method has complex and tedious operation process, high equipment requirement and difficult realization of industrial continuous production.
Chinese patent CN113831738A discloses an addition type liquid silicone rubber foam material and preparation method thereof, the foaming component is composed of 40-90 parts of vinyl silicone oil, 2-10 parts of hydroxyl silicone oil, 0.03-0.12 part of platinum catalyst, 1-16 parts of white carbon black, 15-60 parts of flame retardant filler; the crosslinking component consists of 10-70 parts of vinyl silicone oil, 20-90 parts of hydrogen-containing silicone oil, 1-30 parts of white carbon black and 1-30 parts of flame retardant filler. In order to prevent the foaming component and the crosslinking component from being vulcanized and foamed at room temperature after being mixed, the foaming component and the crosslinking component are mixed at-20 to-10 ℃, which tends to increase the manufacturing cost of freezing the sizing material, and the industrialized mass production is limited.
With the high-speed development of the industries of rail transit, new energy automobiles, outdoor communication, electronic appliances and the like in China, the traditional foam materials (such as polyurethane foam) are difficult to meet the market performance requirements, and the liquid foam silicone rubber gradually replaces the traditional foam materials due to the excellent performances of environmental protection, light weight, weather resistance and the like. However, the production technology of the liquid foam silicone rubber in China is still in a starting stage, and a large distance is needed for realizing large-scale continuous production, so that the continuous large-scale production of the liquid foam silicone rubber is realized, the preparation of the foam silicone rubber elastomer material which meets the market demands and has uniform cell structure, high rebound resilience and flame retardance is very necessary, and the method has important research and development significance.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid foam silicone rubber composition and a preparation method of a foam silicone rubber elastomer thereof. The liquid foam silicone rubber has good fluidity and process operability, and the foam silicone rubber elastomer obtained after solidification has uniform and fine cell structure, good mechanical property and flame retardant property, and can be widely used in the fields of new energy automobile battery pack cladding, motor car floor support, outdoor communication, sealing and protection of electronic and lighting equipment cabinets and the like. Meanwhile, the preparation process is simple, and the method is suitable for continuous large-scale production.
The invention is realized by the following technical scheme: the liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 60-130 parts of base material B, 45-145 parts of base material C, 10-35 parts of structure control agent, 2-10 parts of foaming agent, 10-55 parts of base polymer and 0.5-2 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 60-130 parts of base material B, 45-145 parts of base material C, 10-65 parts of base polymer, 22-45 parts of cross-linking agent and 0.001-0.01 part of inhibitor;
in the above-mentioned a-or B-component,
the composition of the base material A is as follows: 100 parts of base polymer, 40-50 parts of reinforcing filler and 12-22 parts of treating agent D;
the composition of the base material B is as follows: 100 parts of base polymer, 100-300 parts of flame retardant filler and 1-3 parts of treating agent E;
the composition of the base material C is as follows: 100 parts of base polymer, 50-100 parts of heavy filler and 0-3 parts of treating agent F.
The base polymer and the treating agent are respectively added into the three base materials to form paste, so that the surface treatment of the filler can be performed, and the compatibility of the filler can be improved.
Further, the structure control agent is branched polysiloxane with the mass percentage content of vinyl of 1.5-4.5%, and the structure is shown as the following formula (I):
[(Me) 3 SiO 1/2 ] a [Vi(Me)SiO 2/2 ] b [SiO 4/2 ] c （Ⅰ）
wherein a, b and c are natural numbers > 1;
further, the cross-linking agent is linear polysiloxane with the mass percentage content of hydrogen of 1.0-1.6%, and the structure of the cross-linking agent is shown as the following formula (II):
(HMe 2 SiO 1/2 ) 2 (HMeSiO) m (Me 2 SiO) n （Ⅱ）
wherein m is a natural number greater than 1, n is a natural number greater than or equal to 0;
further, the base polymer is linear polysiloxane with the mass percent of vinyl of 0.08-0.3%, and the structure of the linear polysiloxane is shown as the following formula (III):
(ViMe 2 SiO 1/2 ) 2 (ViMeSiO) m (Me 2 SiO) n （Ⅲ）
wherein m is a natural number greater than or equal to 0, and n is a natural number greater than 1.
Further, the blowing agent is an organic alcohol having 1 to 12 carbon atoms and having one hydroxyl functional group per molecule, for example: methanol, ethanol, propanol, isopropanol, n-butanol, dodecyl alcohol, and the like; or organic alcohols having 2 to 6 carbon atoms and having two hydroxyl functions per molecule, for example: ethylene glycol, 1, 3-propylene glycol, 1, 4-butanediol, 1, 2-hexanediol, and mixtures of any one or more thereof.
Further, the platinum catalyst is a complex of chloroplatinic acid and vinyl siloxane.
Further, the inhibitor is one or more of tetravinyl tetramethyl cyclotetrasiloxane, tetramethyl divinyl disiloxane, methylbutynol, acetylene cycloethanol and 3,7, 11-trimethyl-1-dodecyn-3-ol.
Further, in the above base A, the reinforcing filler is selected from the group consisting of a specific surface area of 200m 2 /g、250m 2 /g、300m 2 /g、380m 2 /g、400m 2 Precipitated or fumed silica/g, is a mixture of one or more thereof.
Further, in the base material B, the flame retardant filler is selected from aluminum hydroxide, magnesium oxide and aluminum oxide, and is one or a mixture of more of the aluminum hydroxide, the magnesium oxide and the aluminum oxide.
Further, in the base material C, the heavy filler is selected from diatomite, wollastonite and silica micropowder, and is one or a mixture of more of the above materials.
Further, in the base material A, the treating agent D is one or a mixture of more of hexamethyldisilazane, octamethyl cyclotetrasiloxane and gamma-glycidoxypropyl trimethoxysilane.
Further, in the base material B, the treating agent E is one or a mixture of more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane.
Further, in the base material C, the treating agent F is one or a mixture of two of vinyl tri (2-methoxyethoxy) silane and 3-aminopropyl triethoxy silane.
A method for preparing a foam silicone rubber elastomer from the liquid foam silicone rubber composition described above, comprising the steps of:
1. preparation of the base Material
(1) Preparation of base A
Weighing the materials according to the parts by weight, adding the treating agent D and the reinforcing filler into the base polymer, uniformly stirring, heating to 150 ℃, and continuously stirring for 2-4 hours at a vacuum degree of more than or equal to 0.08MPa to obtain a base material A;
(2) Preparation of base Material B
Weighing the materials according to the parts by weight, adding the treating agent E and the flame-retardant filler into the base polymer, uniformly stirring, heating to 120-150 ℃, and continuously stirring for 1-2.5 h at the vacuum degree of more than or equal to 0.08MPa to obtain a base material B;
(3) Preparation of base C
Weighing the materials according to the parts by weight, adding the treating agent F and the heavy filler into the base polymer, uniformly stirring, heating to 100-120 ℃, and continuously stirring for 0.5-2 h at a vacuum degree of more than or equal to 0.08MPa to obtain a base material C;
2. preparation of A, B component
(1) Preparation of component A
Weighing materials according to parts by weight, sequentially adding a base material A, a base material B, a base material C, a structure control agent, a foaming agent, a base polymer and a platinum catalyst into a stirrer, and stirring and mixing for 1h at room temperature to obtain a component A;
(2) Preparation of component B
Weighing materials according to parts by weight, sequentially adding the base material A, the base material B, the base material C, the base polymer, the cross-linking agent and the inhibitor into a stirrer, stirring and mixing for 1h at room temperature to obtain a component B;
3. preparation of foam silicone rubber elastomer
The method comprises the steps of weighing A, B components according to a mass ratio of 1:1, uniformly mixing the components by a static or dynamic mixer, spraying the components between two layers of release films, controlling the initial thickness of sizing materials by a calendaring process, entering a drying tunnel by a conveyor belt, and foaming and curing the mixture at 45-100 ℃ for 10-20 min to obtain the foam silicone rubber elastomer plate.
The scanning electron microscope image and the performance test result show that the foam silicone rubber elastomer obtained by mixing and curing the component A and the component B of the invention has the pore diameter of 130-350 mu m and the density of 0.25-0.45 g/cm 3 Tensile strength of 315-450 Kpa, elongation of 66-105%, compression deformation stress of 62-105 Kpa, compression permanent setThe shape is 0.52-1.2%, the water absorption is less than or equal to 0.75%, and the flame retardance is V-0; the foam cell structure is uniform and fine, has good mechanical property and flame retardant property, and can completely meet the market application requirements.
Compared with the prior art, the invention has the following advantages:
(1) In the liquid foam silicone rubber composition, the base material A prepared from 100 parts of base polymer, 12-22 parts of treating agent D and 40-50 parts of reinforcing filler is adopted, so that the effects of supporting cells and stabilizing cells can be effectively achieved, and the storage stability of A, B component sizing material is greatly improved.
(2) The foaming and curing process of the liquid foam silicone rubber material is similar to the crystallization process, and foam nucleus generation and foam growth are needed.
(3) The mechanical property and the flame retardant property of the liquid foam silicone rubber not only fully consider the filling quantity and the proportion of various fillers, but also effectively improve the rebound resilience and the pressure change property of the foam silicone rubber elastomer by selecting a centralized cross-linked network structure formed by polysiloxane with different structures. Namely, the structure control agent uses branched polysiloxane with the vinyl mass percentage content of 1.5-4.5%, the cross-linking agent is linear polysiloxane with the hydrogen mass percentage content of 1.0-1.6%, and the two polysiloxanes with different composition structures are matched to form a concentrated cross-linked network structure, so that the rebound resilience and the pressure-changing performance of the foam silicone rubber elastomer are greatly improved.
(4) The invention does not contain substances such as nitrogen, phosphorus, sulfur, organic tin, heavy metal and the like which can poison the platinum catalyst, and can effectively solve the competing relationship between the foaming speed and the curing speed in the foaming curing process through the selected inhibitor and the dosage control, so that the A, B component can have better fluidity and longer operation time after being mixed at normal temperature, and is beneficial to industrial continuous production.
Drawings
FIG. 1 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in example 1;
FIG. 2 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in example 2;
FIG. 3 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in example 3;
FIG. 4 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in example 4;
FIG. 5 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in example 5;
FIG. 6 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in comparative example 1;
FIG. 7 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in comparative example 2;
FIG. 8 is a scanning electron microscope image of the foamed silicone rubber elastomer prepared in comparative example 3;
FIG. 9 is a scanning electron microscope image of the foamed silicone rubber elastomers prepared in comparative example 4 and comparative example 5;
fig. 10 is a product view of the foamed silicone rubber elastomer board of the present invention.
Detailed Description
The present invention will be further described in detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 100 parts of base material B, 100 parts of base material C, 15 parts of structure control agent, 5 parts of foaming agent, 25 parts of base polymer and 1.0 part of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 80 parts of base material B, 120 parts of base material C, 30 parts of base polymer, 25 parts of cross-linking agent and 0.001 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 3%, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 34 [SiO 4/2 ] 448 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.3% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 4 (Me 2 SiO) 803 ；
The foaming agent is n-hexanol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.6%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 23 (Me 2 SiO) 0 ；
The inhibitor is methyl butynol;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.1%) and a reinforcing filler (specific surface area of 200m 2 Fumed silica/g) 40 parts, treating agent D (gamma-glycidoxypropyl trimethoxysilane) 12 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.1 percent), 100 parts of a flame retardant filler (aluminum hydroxide) and 1 part of a treating agent E (methyltrimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with a vinyl mass percentage content of 0.1%), 50 parts of a heavy filler (wollastonite) and 1 part of a treating agent F (vinyltris (2-methoxyethoxy) silane).
Preparation of base A: weighing the materials according to the parts by weight, adding the treating agent D and the reinforcing filler into the base polymer, uniformly stirring, heating to 150 ℃, and continuously stirring for 2-4 hours at a vacuum degree of more than or equal to 0.08MPa to obtain a base material A;
preparation of base material B: weighing the materials according to the parts by weight, adding the treating agent E and the flame-retardant filler into the base polymer, uniformly stirring, heating to 120-150 ℃, and continuously stirring for 1-2.5 h at the vacuum degree of more than or equal to 0.08MPa to obtain a base material B;
preparation of base material C: weighing the materials according to the parts by weight, adding the treating agent F and the heavy filler into the base polymer, uniformly stirring, heating to 100-120 ℃, and continuously stirring for 0.5-2 h at a vacuum degree of more than or equal to 0.08MPa to obtain a base material C;
and (3) preparation of the component A: weighing materials according to parts by weight, sequentially adding a base material A, a base material B, a base material C, a structure control agent, a foaming agent, a base polymer and a platinum catalyst into a stirrer, and stirring and mixing for 1h at room temperature to obtain a component A;
and (3) preparation of a component B: weighing materials according to parts by weight, sequentially adding the base material A, the base material B, the base material C, the base polymer, the cross-linking agent and the inhibitor into a stirrer, stirring and mixing for 1h at room temperature to obtain a component B;
the A, B components are weighed according to the mass ratio of 1:1, uniformly mixed by a static or dynamic mixer, sprayed between two layers of release films, subjected to a calendaring process to control the initial thickness of sizing materials, finally conveyed into a drying tunnel by a conveyor belt, and foamed and cured for 20min at 60 ℃ to obtain the foam silicone rubber elastomer plate (the plate product is shown in figure 10). The results of the performance tests (mechanical properties, flame retardant properties, water absorption, cell structure, etc.) performed on the elastomers are shown in Table 1, and a scanning electron microscope image of the elastomers is shown in FIG. 1.
Example 2
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 60 parts of base material B, 50 parts of base material C, 20 parts of structure control agent, 4.5 parts of foaming agent, 52 parts of base polymer and 1.0 part of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 105 parts of base material B, 64 parts of base material C, 55 parts of base polymer, 32 parts of cross-linking agent and 0.003 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 2.6%, and the structural formula is [ (Me) 3 SiO 1/2 ] 4 [Vi(Me)SiO 2/2 ] 43 [SiO 4/2 ] 683 ；
The base polymer was a linear polysiloxane having a vinyl mass percent of 0.08% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 6 (Me 2 SiO) 3504 ；
The foaming agent is dodecyl alcohol;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The catalyst and inhibitor were the same as in example 1;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.08%) and a reinforcing filler (specific surface area of 300m 2 Fumed silica/g) 40 parts, treating agent D (hexamethyldisilazane) 20 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.08 percent), 100 parts of a flame retardant filler (magnesium hydroxide) and 1 part of a treating agent E (methyltrimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.08%), 50 parts of a heavy filler (silica micropowder) and 1 part of a treating agent F (vinyltris (2-methoxyethoxy) silane).
According to the same method as that of example 1, base stock A, base stock B and base stock C are prepared independently, component A and component B are prepared, the prepared A, B components are mixed uniformly by a dynamic mixer according to the mass ratio of 1:1, then sprayed between two layers of release films, the initial thickness of sizing material is controlled by a calendaring process, and finally the sizing material enters a drying tunnel by a conveyor belt, and foam curing is carried out at 45 ℃ for 20min to obtain the foam silicone rubber elastomer plate. The results of the performance tests (mechanical properties, flame retardant properties, water absorption, cell structure, etc.) performed on the elastomers are shown in Table 1, and a scanning electron microscope image of the elastomers is shown in FIG. 2.
Example 3
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 75 parts of base material B, 92 parts of base material C, 12 parts of structure control agent, 6 parts of foaming agent, 48 parts of base polymer and 1.5 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 70 parts of base material B, 88 parts of base material C, 33 parts of base polymer, 40 parts of cross-linking agent and 0.01 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 4.2%, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 50 [SiO 4/2 ] 459 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.2% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 0 (Me 2 SiO) 363 ；
The foaming agent is 1, 3-propylene glycol;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.0%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 35 (Me 2 SiO) 20 ；
The catalyst and inhibitor were the same as in example 1;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.2%) and a reinforcing filler (specific surface area of 300m 2 Gas-phase white carbon black per gram) 45 parts, treating agent D (octamethyl cyclotetrasiloxane) 22 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.2 percent), 200 parts of a flame retardant filler (aluminum oxide) and 2 parts of a treating agent E (methyltriethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.2%), 50 parts of heavy filler (diatomite) and 1 part of a treating agent F (3-aminopropyl triethoxysilane).
A foam silicone rubber elastomer sheet was produced in the same manner as in example 1. The results of the measurements of the relevant properties (mechanical properties, flame retardant properties, water absorption and cell structure, etc.) of the elastomer are shown in Table 1, and a scanning electron microscope image of the elastomer is shown in FIG. 3.
Example 4
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 130 parts of base material B, 45 parts of base material C, 35 parts of structure control agent, 10 parts of foaming agent, 55 parts of base polymer and 1.5 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 130 parts of base material B, 45 parts of base material C, 65 parts of base polymer, 35 parts of cross-linking agent and 0.004 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 4.5 percent, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 42 [SiO 4/2 ] 357 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.15% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 2 (Me 2 SiO) 969 ；
The foaming agent is glycol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is 3,7, 11-trimethyl-1-dodecyn-3-ol;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.15%) and a reinforcing filler (specific surface area of 380m 2 Fumed silica/g) 40 parts, treating agent D (hexamethyldisilazane) 22 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.15 percent), 100 parts of a flame retardant filler (aluminum hydroxide) and 2.5 parts of a treating agent E (methyltriethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.15%), 75 parts of heavy filler (diatomite) and 2 parts of a treating agent F (3-aminopropyl triethoxysilane).
According to the same method as that of example 1, base stock A, base stock B and base stock C are prepared independently, component A and component B are prepared, the prepared A, B components are mixed uniformly by a dynamic mixer according to the mass ratio of 1:1, then sprayed between two layers of release films, the initial thickness of sizing material is controlled by a calendaring process, and finally the sizing material enters a drying tunnel by a conveyor belt, and foam curing is carried out at 80 ℃ for 20min to obtain the foam silicone rubber elastomer plate. The results of the performance tests (mechanical properties, flame retardant properties, water absorption, cell structure, etc.) performed on the elastomers are shown in Table 1, and a scanning electron microscope image of the elastomers is shown in FIG. 4.
Example 5
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 82 parts of base material B, 77 parts of base material C, 25 parts of structure control agent, 5 parts of foaming agent, 51 parts of base polymer and 1.25 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 110 parts of base material B, 48 parts of base material C, 18 parts of base polymer, 30 parts of cross-linking agent and 0.006 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 3.7 percent, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 24 [SiO 4/2 ] 255 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.12% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 1 (Me 2 SiO) 908 ；
The foaming agent is 1, 4-butanediol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the cross-linking agent is hydrogen mass percentA fraction of 1.5% of linear polysiloxanes having the formula (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is acetylene cyclic ethanol;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.12%) and a reinforcing filler (specific surface area of 400m 2 Fumed silica/g) 40 parts, treating agent D (hexamethyldisilazane) 22 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.12%), 150 parts of a flame retardant filler (magnesium oxide) and 1.5 parts of a treating agent E (vinyltrimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.12%), 75 parts of heavy filler (diatomite) and 2 parts of a treating agent F (vinyltris (2-methoxyethoxy) silane).
According to the same method as that of example 1, base stock A, base stock B and base stock C are prepared independently, component A and component B are prepared, the prepared A, B components are mixed uniformly by a dynamic mixer according to the mass ratio of 1:1, then sprayed between two layers of release films, the initial thickness of sizing material is controlled by a calendaring process, and finally the sizing material enters a drying tunnel by a conveyor belt, and foam curing is carried out at 100 ℃ for 10min to obtain the foam silicone rubber elastomer plate. The results of the performance tests (mechanical properties, flame retardant properties, water absorption, cell structure, etc.) performed on the elastomers are shown in Table 1, and a scanning electron microscope image of the elastomers is shown in FIG. 5.
Example 6
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 86 parts of base material B, 60 parts of base material C, 32 parts of structure control agent, 5 parts of foaming agent, 40 parts of base polymer and 1.75 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 80 parts of base material B, 130 parts of base material C, 48 parts of base polymer, 35 parts of cross-linking agent and 0.0045 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 2.0 percent, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 21 [SiO 4/2 ] 439 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.18% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 0 (Me 2 SiO) 403 ；
The foaming agent is n-butanol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is a mixture of tetravinyl tetramethyl cyclotetrasiloxane and acetylene cyclic ethanol according to the mass ratio of 1:1;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.18%) and a reinforcing filler (specific surface area of 300m 2 Fumed silica/g) 50 parts, treating agent D (hexamethyldisilazane) 20 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18 percent), 200 parts of a flame retardant filler (aluminum hydroxide) and 2 parts of a treating agent E (vinyl trimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with a vinyl mass percentage content of 0.18%), 75 parts of a heavy filler (diatomite) and 2 parts of a treating agent F (vinyltris (2-methoxyethoxy) silane).
A foam silicone rubber elastomer sheet was produced in the same manner as in example 4. The results of the tests of the relevant properties (mechanical properties, flame retardant properties, water absorption and cell structure, etc.) of the elastomers are shown in Table 1.
Example 7
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 65 parts of base material B, 145 parts of base material C, 10 parts of structure control agent, 2 parts of foaming agent, 10 parts of base polymer and 0.5 part of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 60 parts of base material B, 145 parts of base material C, 10 parts of base polymer, 22 parts of cross-linking agent and 0.008 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 1.5%, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 9 [SiO 4/2 ] 254 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.3% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 8 (Me 2 SiO) 1204 ；
The foaming agent is methanol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is a mixture of methyl butynol and acetylene cyclic ethanol according to the mass ratio of 1:2;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.18%) and a reinforcing filler (specific surface area of 250m 2 Fumed silica/g) 50 parts, treating agent D (hexamethyldisilazane) 18 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18 percent), 300 parts of a flame retardant filler (aluminum hydroxide) and 3 parts of a treating agent E (vinyl trimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with a vinyl mass percentage of 0.18%) and 100 parts of a heavy filler (diatomite).
A foam silicone rubber elastomer sheet was produced in the same manner as in example 4. The results of the tests of the relevant properties (mechanical properties, flame retardant properties, water absorption and cell structure, etc.) of the elastomers are shown in Table 1.
Example 8
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 90 parts of base material B, 90 parts of base material C, 15 parts of structure control agent, 5.5 parts of foaming agent, 50 parts of base polymer and 1.6 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 80 parts of base material B, 80 parts of base material C, 42 parts of base polymer, 45 parts of cross-linking agent and 0.009 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 4.0%, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 18 [SiO 4/2 ] 174 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.18% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 0 (Me 2 SiO) 403 ；
The foaming agent is hexanediol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is acetylene cyclic ethanol;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.18%) and a reinforcing filler (specific surface area of 300m 2 Gas phase white carbon black per gram) 45 parts, treating agent D (hexamethyldisilazane) 15 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18 percent), 200 parts of a flame retardant filler (aluminum hydroxide) and 2 parts of a treating agent E (vinyl trimethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18%), 60 parts of heavy filler (diatomite) and 1.5 parts of a treating agent F (vinyltris (2-methoxyethoxy) silane).
A foam silicone rubber elastomer sheet was produced in the same manner as in example 4. The results of the tests of the relevant properties (mechanical properties, flame retardant properties, water absorption and cell structure, etc.) of the elastomers are shown in Table 1.
Example 9
The liquid foam silicone rubber composition consists of the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 85 parts of base material B, 55 parts of base material C, 28 parts of structure control agent, 8 parts of foaming agent, 48 parts of base polymer and 2.0 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 95 parts of base material B, 140 parts of base material C, 20 parts of base polymer, 40 parts of cross-linking agent and 0.01 part of inhibitor;
wherein,
the structure control agent is branched polysiloxane with vinyl mass percent content of 3.5 percent, and the structural formula is [ (Me) 3 SiO 1/2 ] 2 [Vi(Me)SiO 2/2 ] 15 [SiO 4/2 ] 168 ；
The base polymer was a linear polysiloxane having a vinyl mass percentage of 0.18% and a structural formula of (ViMe 2 SiO 1/2 ) 2 (ViMeSiO) 0 (Me 2 SiO) 403 ；
The foaming agent is isopropanol;
the catalyst is a complex of chloroplatinic acid and vinyl siloxane;
the crosslinking agent is linear polysiloxane with hydrogen mass percent of 1.5%, and the structural formula is (HMe 2 SiO 1/2 ) 2 (HMeSiO) 28 (Me 2 SiO) 3 ；
The inhibitor is acetylene cyclic ethanol;
the composition of the base material A is as follows: 100 parts of a base polymer (linear polysiloxane having a vinyl mass percentage of 0.18%) and a reinforcing filler (specific surface area of 300m 2 Fumed silica/g) 40 parts, treating agent D (hexamethyldisilazane) 17.5 parts;
the composition of the base material B is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18 percent), 200 parts of a flame retardant filler (aluminum hydroxide) and 2 parts of a treating agent E (methyltriethoxysilane);
the composition of the base material C is as follows: 100 parts of a base polymer (linear polysiloxane with the mass percentage of vinyl content of 0.18%), 80 parts of heavy filler (diatomite) and 2.5 parts of a treating agent F (vinyltris (2-methoxyethoxy) silane).
A foam silicone rubber elastomer sheet was produced in the same manner as in example 4. The results of the tests of the relevant properties (mechanical properties, flame retardant properties, water absorption and cell structure, etc.) of the elastomers are shown in Table 1.
As can be seen from the test results in Table 1 and FIGS. 1 to 5, the foam silicone rubber elastomer obtained by mixing and curing the component A and the component B according to the present invention has a cell diameter of 130 to 350. Mu.m, and a density of 0.25 to 0.45g/cm 3 The tensile strength is 315-450 Kpa, the elongation is 66-105%, the compression deformation stress is 62-105 Kpa, the compression permanent deformation is 0.52-1.2%, the water absorption is less than or equal to 0.75%, and the flame retardance is V-0. The foam silicone rubber elastomer has uniform and fine cell structure, good mechanical property and flame retardant property, and can meet the market performance index requirement.
The present invention will be further described below by way of comparative examples.
Comparative example 1
This comparative example is based on example 1Based on the preparation, the specific surface area of the fumed silica in the base material A is adjusted, in the comparative example, 40 parts of the fumed silica has the specific surface area of 180m 2 40 parts of fumed silica per gram of binder A of example 1 had a specific surface area of 200m 2 The other formulation components and preparation method of the fumed silica of/g are the same as in example 1. The foam silicone rubber elastomers prepared in this comparative example and example 1 were subjected to performance test, and the results are shown in Table 2; comparative example 1 a scanning electron micrograph of a foamed silicone rubber elastomer is shown in figure 6.
As can be seen from table 2 and fig. 6: single variation of specific surface area of fumed silica from 200m of example 1 2 The/g was reduced to 180m in comparative example 1 2 And/g, the reinforcing effect is poor, so that obvious adverse effects are brought to the performances such as cell structure, density, mechanics, water absorption and the like of the foam silicone rubber elastomer. The foam silicone rubber elastomer of comparative example 1 had a coarse and uneven cell structure and a density of 0.82g/cm 3 . For foams, as the density increases, although both tensile strength and elongation increase, in market applications, the lower density, better compression set, lower water absorption and more uniform cell structure of the foam are the main emphasis, not the higher elongation, the higher tensile strength, because the mechanical properties of the foam are generally very low (all less than 1 Mpa) while the density of the foam exceeds 0.5g/cm 3 No practical market value exists.
Comparative example 2
This comparative example was based on example 6, the heavy filler in base C was replaced by the addition of 75 parts of calcium carbonate, the remainder of the formulation components and preparation being the same as in example 6. The results of performance tests performed on the foam silicone rubber elastomers prepared in this comparative example and example 6 are shown in Table 3, and the scanning electron microscope image of the foam silicone rubber elastomer in comparative example 2 is shown in FIG. 7.
As can be seen from table 3 and fig. 7: the composition of the heavy filler in the single modified base material C is converted from diatomite in example 6 into calcium carbonate in comparative example 2, and the calcium carbonate cannot perform a nucleation function in the foaming forming process of the liquid foam silicone rubber, so that the pore size of the foam silicone rubber elastomer can be obviously increased, and the mechanical and water absorption performance of the elastomer can be reduced.
Comparative example 3
The vinyl content of the structure controlling agent in the A component was adjusted based on example 4, in this comparative example, branched polysiloxane having a vinyl content of 1.35% by mass was added as the structure controlling agent, and the remaining formulation components and preparation method were the same as in example 4. The results of performance tests performed on the foam silicone rubber elastomers prepared in this comparative example and example 4 are shown in Table 4, and the scanning electron microscope image of the foam silicone rubber elastomer in comparative example 3 is shown in FIG. 8.
As can be seen from table 4 and fig. 8: the vinyl content of the single change structure controlling agent was changed from 4.5% of the vinyl content structure controlling agent in example 4 to 1.35% in comparative example 3, and the resilience of the foam silicone rubber elastomer was deteriorated and the compression set was significantly increased due to the greatly reduced concentrated crosslinked network structure.
Comparative example 4
The amount of platinum catalyst in the A-component was adjusted based on example 9, and in this comparative example, 0.45 parts of platinum catalyst was added, and the other formulation components and preparation methods were the same as in example 9. The results of performance tests performed on the foam silicone rubber elastomers prepared in this comparative example and example 9 are shown in Table 5, and the scanning electron microscope image of the foam silicone rubber elastomer in comparative example 4 is shown in FIG. 9.
As can be seen from table 5 and fig. 9: the single change of the amount of platinum catalyst, from 2.0 parts of the platinum catalyst of example 9 to 0.45 parts of that of comparative example 4, resulted in a liquid foam silicone rubber which was foamed and cured at a faster rate than the curing rate, i.e., the gas was released at the initial stage of the reaction, while the viscosity of the liquid foam silicone rubber was insufficient to hold the gas, resulting in collapse of cells and a significant increase in cell size.
Comparative example 5
In this comparative example, the amount of the inhibitor in the B component was adjusted based on example 9, and in this comparative example, 0.012 parts of acetylene-cyclic ethanol was added, and the other formulation components and preparation methods were the same as in example 9. The results of performance tests performed on the foam silicone rubber elastomers prepared in this comparative example and example 9 are shown in Table 6, and the scanning electron microscope image of the foam silicone rubber elastomer in comparative example 5 is shown in FIG. 9.
As can be seen from table 6 and fig. 9: the single change of the inhibitor amount, from 0.01 part of acetylene cyclohexanol in example 9 to 0.012 part in comparative example 5, resulted in a liquid foam silicone rubber having a slower curing speed than the foaming speed during foaming curing, i.e., gas was released at the initial stage of the reaction, while the viscosity of the liquid foam silicone rubber was insufficient to hold the gas, resulting in collapse of cells and a significant increase in cell size.
In summary, the specific surface area of the white carbon black, the type of heavy filler, the vinyl content of the structure control agent, the amount of the platinum catalyst and the inhibitor, and other factors have significant influence on the mechanical properties and the cell structure of the foam silicone rubber elastomer. In the invention, the structure control agent and the cell structure control filler are innovatively used, so that the liquid foam silicone rubber is ensured to have better fluidity and operability, and the ideal mechanical property and cell structure can be obtained.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (10)
1. The liquid foam silicone rubber composition is characterized by comprising the following component A and component B in parts by weight:
and (3) a component A: 100 parts of base material A, 60-130 parts of base material B, 45-145 parts of base material C, 10-35 parts of structure control agent, 2-10 parts of foaming agent, 10-55 parts of base polymer and 0.5-2 parts of platinum catalyst;
and the component B comprises the following components: 100 parts of base material A, 60-130 parts of base material B, 45-145 parts of base material C, 10-65 parts of base polymer, 22-45 parts of cross-linking agent and 0.001-0.01 part of inhibitor;
the composition of the base material A is as follows: 100 parts of base polymer, 40-50 parts of reinforcing filler and 12-22 parts of treating agent D;
the composition of the base material B is as follows: 100 parts of base polymer, 100-300 parts of flame retardant filler and 1-3 parts of treating agent E;
the composition of the base material C is as follows: 100 parts of base polymer, 50-100 parts of heavy filler and 0-3 parts of treating agent F;
the structure control agent is branched polysiloxane with vinyl mass percent content of 1.5-4.5%, and the structure is shown as the following formula (I):
[(Me) 3 SiO 1/2 ] a [Vi(Me)SiO 2/2 ] b [SiO 4/2 ] c （Ⅰ）
wherein a, b and c are natural numbers > 1;
the cross-linking agent is linear polysiloxane with the mass percentage content of hydrogen of 1.0-1.6%, and the structure of the cross-linking agent is shown as the following formula (II):
(HMe 2 SiO 1/2 ) 2 (HMeSiO) m (Me 2 SiO) n （Ⅱ）
wherein m is a natural number greater than 1, and n is a natural number greater than or equal to 0.
2. The liquid foam silicone rubber composition according to claim 1, wherein the base polymer is a linear polysiloxane with a vinyl mass percentage content of 0.08-0.3%, and the structure is shown as the following formula (iii):
(ViMe 2 SiO 1/2 ) 2 (ViMeSiO) m (Me 2 SiO) n （Ⅲ）
wherein m is a natural number greater than or equal to 0, and n is a natural number greater than 1.
3. A liquid foam silicone rubber composition according to claim 1, characterized in that the foaming agent is an organic alcohol having 1-12 carbon atoms and having one hydroxyl function per molecule, or an organic alcohol having 2-6 carbon atoms and having two hydroxyl functions per molecule, a mixture of any one or more.
4. The liquid foam silicone rubber composition of claim 1, wherein the platinum catalyst is a complex of chloroplatinic acid and vinyl siloxane.
5. The liquid foam silicone rubber composition according to claim 1, wherein the inhibitor is a mixture of one or more of tetravinyl tetramethyl cyclotetrasiloxane, tetramethyl divinyl disiloxane, methylbutynol, acetylene cycloethanol, 3,7, 11-trimethyl-1-dodecyn-3-ol.
6. The liquid foam silicone rubber composition according to claim 1, wherein the reinforcing filler is selected from the group consisting of a specific surface area of 200m in the base A 2 /g、250m 2 /g、300m 2 /g、380m 2 /g、400m 2 Precipitated or fumed silica/g, is a mixture of one or more thereof.
7. A liquid foam silicone rubber composition according to claim 1, wherein in said base material B, said flame retardant filler is selected from the group consisting of aluminum hydroxide, magnesium oxide, aluminum oxide, and mixtures of one or more thereof.
8. The liquid foam silicone rubber composition according to claim 1, wherein the heavy filler is selected from diatomaceous earth, wollastonite, and fine silica powder, and is one or more of the above-mentioned materials.
9. A liquid foam silicone rubber composition according to claim 1, characterized in that in the above base a, the treating agent D is a mixture of one or more of hexamethyldisilazane, octamethyl cyclotetrasiloxane, γ -glycidoxypropyl trimethoxysilane; in the base material B, the treating agent E is one or a mixture of more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane; in the base material C, the treating agent F is one or a mixture of two of vinyl tri (2-methoxyethoxy) silane and 3-aminopropyl triethoxy silane.
10. A method of preparing a foam silicone rubber elastomer from a liquid foam silicone rubber composition according to claim 1, comprising the steps of:
1. preparation of the base Material
(1) Preparation of base A
Weighing the materials according to the parts by weight, adding the treating agent D and the reinforcing filler into the base polymer, uniformly stirring, heating to 150 ℃, and continuously stirring for 2-4 hours at a vacuum degree of more than or equal to 0.08MPa to obtain a base material A;
(2) Preparation of base Material B
Weighing the materials according to the parts by weight, adding the treating agent E and the flame-retardant filler into the base polymer, uniformly stirring, heating to 120-150 ℃, and continuously stirring for 1-2.5 h at the vacuum degree of more than or equal to 0.08MPa to obtain a base material B;
(3) Preparation of base C
Weighing the materials according to the parts by weight, adding the treating agent F and the heavy filler into the base polymer, uniformly stirring, heating to 100-120 ℃, and continuously stirring for 0.5-2 h at a vacuum degree of more than or equal to 0.08MPa to obtain a base material C;
2. preparation of A, B component
(1) Preparation of component A
Weighing materials according to parts by weight, sequentially adding a base material A, a base material B, a base material C, a structure control agent, a foaming agent, a base polymer and a platinum catalyst into a stirrer, and stirring and mixing for 1h at room temperature to obtain a component A;
(2) Preparation of component B
Weighing materials according to parts by weight, sequentially adding the base material A, the base material B, the base material C, the base polymer, the cross-linking agent and the inhibitor into a stirrer, stirring and mixing for 1h at room temperature to obtain a component B;
3. preparation of foam silicone rubber elastomer
The method comprises the steps of weighing A, B components according to a mass ratio of 1:1, uniformly mixing the components by a static or dynamic mixer, spraying the components between two layers of release films, controlling the initial thickness of sizing materials by a calendaring process, entering a drying tunnel by a conveyor belt, and foaming and curing the mixture at 45-100 ℃ for 10-20 min to obtain the foam silicone rubber elastomer plate.
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