CN112778571A - Food-grade silica gel foam and manufacturing method thereof - Google Patents
Food-grade silica gel foam and manufacturing method thereof Download PDFInfo
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- CN112778571A CN112778571A CN202011622444.0A CN202011622444A CN112778571A CN 112778571 A CN112778571 A CN 112778571A CN 202011622444 A CN202011622444 A CN 202011622444A CN 112778571 A CN112778571 A CN 112778571A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000006260 foam Substances 0.000 title claims abstract description 52
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 14
- 239000000741 silica gel Substances 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 61
- 239000010703 silicon Substances 0.000 claims abstract description 61
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 39
- 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 35
- 239000003063 flame retardant Substances 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 34
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 33
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 33
- 229920002635 polyurethane Polymers 0.000 claims abstract description 30
- 239000004814 polyurethane Substances 0.000 claims abstract description 30
- 239000002270 dispersing agent Substances 0.000 claims abstract description 29
- 239000000499 gel Substances 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 25
- 229920002545 silicone oil Polymers 0.000 claims abstract description 19
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 14
- 239000012763 reinforcing filler Substances 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 50
- -1 polydimethylsiloxane Polymers 0.000 claims description 36
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 24
- 239000001257 hydrogen Substances 0.000 claims description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims description 24
- 239000006229 carbon black Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 20
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- 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 18
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 18
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 13
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 239000003963 antioxidant agent Substances 0.000 claims description 11
- 230000003078 antioxidant effect Effects 0.000 claims description 11
- 239000007822 coupling agent Substances 0.000 claims description 11
- 238000001723 curing Methods 0.000 claims description 11
- 239000003112 inhibitor Substances 0.000 claims description 11
- 229920002323 Silicone foam Polymers 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 239000013514 silicone foam Substances 0.000 claims description 10
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000049 pigment Substances 0.000 claims description 9
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 9
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 8
- ZXKHOVDDJMJXQP-UHFFFAOYSA-N 1-ethenylcyclohexan-1-ol Chemical group C=CC1(O)CCCCC1 ZXKHOVDDJMJXQP-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 4
- CVQVSVBUMVSJES-UHFFFAOYSA-N dimethoxy-methyl-phenylsilane Chemical compound CO[Si](C)(OC)C1=CC=CC=C1 CVQVSVBUMVSJES-UHFFFAOYSA-N 0.000 claims description 4
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 229910021485 fumed silica Inorganic materials 0.000 claims description 3
- 239000004611 light stabiliser Substances 0.000 claims description 3
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- UDUKMRHNZZLJRB-UHFFFAOYSA-N triethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OCC)(OCC)OCC)CCC2OC21 UDUKMRHNZZLJRB-UHFFFAOYSA-N 0.000 claims description 3
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 230000032683 aging Effects 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 229910020388 SiO1/2 Inorganic materials 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 229910020442 SiO2—TiO2 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- CIQDYIQMZXESRD-UHFFFAOYSA-N dimethoxy(phenyl)silane Chemical class CO[SiH](OC)C1=CC=CC=C1 CIQDYIQMZXESRD-UHFFFAOYSA-N 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920005862 polyol Chemical class 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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
- C08J9/36—After-treatment
- C08J9/40—Impregnation
- C08J9/42—Impregnation with macromolecular compounds
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
-
- 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
- C08J9/36—After-treatment
- C08J9/40—Impregnation
-
- 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
-
- 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
-
- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5435—Silicon-containing compounds containing oxygen containing oxygen in a ring
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
Abstract
The invention discloses a food-grade silica gel foam and a manufacturing method thereof, wherein the food-grade silica gel foam comprises polyurethane open-cell foam and organosilicon gel coated and bonded on the polyurethane open-cell foam, the organosilicon gel is a bi-component and is divided into a component A and a component B, and the mixing mass ratio is 1: 1; wherein the component A comprises the following raw materials in parts by weight: 20-100 parts of first vinyl silicone oil; 5-50 parts of first MQ silicon resin; 0-5 parts of first reinforcing filler; 10-35 parts of first flame-retardant temperature-resistant filler; 0.1-2 parts of a first dispersing agent; 0.01-0.5 part of platinum catalyst; according to the invention, the organic silicon gel with a specific formula is used as a matrix, the polyurethane open-cell foam is coated and bonded, and the untreated polyurethane open-cell foam is subjected to enhancement modification, so that the high temperature resistance is improved to 180-210 ℃, and the flame retardant property meets the standard of CALTB 117-A, BS 5852; meanwhile, the mechanical property and the aging resistance are improved.
Description
Technical Field
The invention relates to the technical field of foamed plastic, in particular to food-grade silica gel foamed plastic and a manufacturing method thereof.
Background
The polyurethane open-cell foam is widely applied to the industries of furniture, automobiles and the like and is often used as a cushion and a cushion pad material.
The untreated polyurethane open-cell foam has poor high-temperature resistance (the using temperature is less than 130 ℃), is combustible (the oxygen index is 17), and needs temperature resistance and flame retardant treatment. The common temperature-resistant and flame-retardant treatment method comprises the following steps:
for before foaming:
(1) adding flame retardant (active flame retardant, non-active flame retardant, intumescent flame retardant, nanometer flame retardant, etc.);
(2) and (3) flame-retardant modification of the structure. By introducing flame-retardant modified isocyanate or polyol, a molecular chain with better flame retardance is endowed to polyurethane;
for the post-foaming:
the surface of the open-cell foam can be coated with a layer of temperature-resistant and flame-retardant substance by a dipping method through the processes of surface treatment, dipping, coating, curing and the like. The dipping method is not limited by the foaming process and can be used as a flexible treatment method for the temperature resistance and flame retardance requirements of the existing foam.
The temperature-resistant and flame-retardant impregnating solution for the impregnating method generally requires low viscosity before curing and good wettability to foam, and endows the foam with temperature resistance and flame retardance after curing and has excellent bonding force with the foam.
The temperature-resistant and flame-retardant impregnating solution has influence on the mechanical property of the polyurethane open-cell foam after being cured. Meanwhile, because of complete coating, the method has obvious characteristics compared with a treatment method before foaming, and can be used for surface treatment of polyurethane open-cell foam, improvement of high-temperature resistance and the like.
The traditional temperature-resistant and flame-retardant liquid is mainly water-based flame-retardant liquid and also comprises organic silicon resin composition.
Patent CN1140584C provides a high temperature resistant polyurethane foam, which is coated with a room temperature curing or double-component heating curing silicone resin by coating or spraying, so that the flame retardant property of the composite material reaches UL 94-V0 level. Patent CN109134918A discloses a preparation method of a modifying solution for improving the flame retardant property of foam plastics, which improves the mechanical property and antibacterial property of the material while achieving good flame retardant effect. Patent CN110918008A adopts soaking of foam in SiO2-TiO2According to the method for compounding the sol, after the sol is formed into gel, the flame retardant property of the composite material reaches UL 94-V0 level.
Disclosure of Invention
In view of the above, the present invention provides a food-grade silica gel foam and a manufacturing method thereof, which aims at overcoming the defects in the prior art, and the food-grade silica gel foam uses an organic silicon gel as a substrate, coats and bonds polyurethane open-cell foam, enhances and modifies untreated polyurethane open-cell foam, endows the polyurethane open-cell foam with excellent flame retardant property, mechanical property, temperature resistance, aging resistance, etc., and expands the application of the polyurethane open-cell foam in the field of high temperature resistant materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
a food-grade silica gel foam comprises polyurethane open-cell foam and organosilicon gel coated and bonded on the polyurethane open-cell foam, wherein the organosilicon gel is a bi-component comprising a component A and a component B, and the mixing mass ratio is 1: 1; wherein the component A comprises the following raw materials in parts by weight: 20-100 parts of first vinyl silicone oil; 5-50 parts of first MQ silicon resin; 0-5 parts of first reinforcing filler; 10-35 parts of first flame-retardant temperature-resistant filler; 0.1-2 parts of a first dispersing agent; 0.01-0.5 part of platinum catalyst;
the component B comprises the following raw materials in parts by weight: 20-100 parts of second vinyl silicone oil; 5-35 parts of hydrogen-containing silicone oil; 5-50 parts of second MQ silicon resin; 0-5 parts of second reinforcing filler; 10-35 parts of a second flame-retardant temperature-resistant filler; 0.1-2 parts of a second dispersing agent; 0.1-0.5 part of inhibitor; 0.1-5 parts of a coupling agent; 0.01-3 parts of antioxidant; 0.01-2 parts of pigment.
Preferably, the first vinyl silicone oil and the second vinyl silicone oil are vinyl-terminated polydimethylsiloxane with the viscosity of 1000-20000 cps and the vinyl content of 0.1-5%.
As a preferable scheme, the first MQ silicon resin and the second MQ silicon resin are phenyl vinyl MQ silicon resins self-made by laboratories, the M/Q value is 0.6-0.9, the viscosity is 100-10000 cps, the vinyl content is 1.2% -3.5%, and the phenyl content is 2.0% -20.5%; the preparation steps are as follows: 100ml of 0.2% HCl aqueous solution was added to a 250ml three-necked flask; under stirring at room temperature, firstly, dropwise adding a mixture of hexamethyldisiloxane, methylphenyldimethoxysilane and tetramethyldivinyldisiloxane in a certain ratio by using a dropping funnel for about 0.5 hour, then heating to 60 ℃, and stirring for reacting for 1 hour; dropwise adding ethyl orthosilicate by using a dropping funnel, wherein the dropwise adding is completed within 0.5 hour, then heating to 115 ℃, and stirring for reacting for 5 hours; cooling to room temperature, adding toluene for extraction, and washing with water to neutrality; collecting toluene layer, introducing N at 100 deg.C2And (4) carrying out reduced pressure distillation for 1-2 hours under the protection to obtain the colorless and transparent phenyl vinyl MQ resin.
As a preferable scheme, the first reinforcing filler and the second reinforcing filler are both white carbon black, and the white carbon black is fumed silica or precipitated silica.
As a preferable scheme, the first flame-retardant temperature-resistant filler and the second flame-retardant temperature-resistant filler are one or a combination of more of silica micropowder, aluminum hydroxide and magnesium hydroxide, and the form of the filler is amorphous powder with the particle size of 1-10 microns.
6. The food grade silicone foam according to claim 1, wherein: the above-mentionedThe first dispersant and the second dispersant are respectively a Bike dispersant or a dike dispersant sold in the market, and the specific types are BYK-W9012, BYK-W969, BYK-W980, BYK-W996,
Dispers750W、
Dispers650、
One of Dispers 670.
As a preferred scheme, the platinum catalyst is a self-made platinum/tetramethyl divinyl disiloxane complex, and the preparation steps are as follows: adding chloroplatinic acid and tetramethyl divinyl disiloxane in a certain proportion into a 100ml three-neck flask with a reflux condenser tube and a thermometer, heating to 120 ℃ under the stirring of a stirrer, and reacting for 2 hours; cooling to room temperature, and filtering to remove platinum black precipitate; the solution was neutralized to pH 7 with sodium bicarbonate, dried with anhydrous calcium chloride, and filtered to remove white solids to obtain platinum/tetramethyldivinyldisiloxane complex.
As a preferable scheme, the hydrogen-containing silicone oil is bi-functional or tri-functional hydrogen-containing polysiloxane, the viscosity is 10-500 cps, and the hydrogen content: 0.2 to 1.3 percent.
As a preferred embodiment, the inhibitor is 1-vinylcyclohexanol; the coupling agent is one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560), 2(3, 4-epoxycyclohexyl) ethyl triethoxy silane, gamma-aminopropyl triethoxy silane (KH-550) and 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane; the antioxidant is one or more of 2112, AO-60(1010), 1076, uv-resistant light stabilizer uv-770; the pigment is one or a combination of carbon black, titanium dioxide, phthalocyanine green and pigment blue 15: 4.
The preparation method of the food-grade silica gel foam comprises the steps of firstly uniformly mixing A, B components of the organic silicon gel in advance, then adding the mixture into a stirring kettle according to the mass ratio of 1:1, stirring for 10-20 min, then defoaming for 3min, completely soaking untreated polyurethane open-pore foam into the silica gel, flatly placing the foam on a steel wire mesh after 5min, rolling for 4-10 times back and forth by using a roller, and then placing the foam into an oven to be cured for 0.5-2.5 h at 110 ℃.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
according to the invention, the organic silicon gel with a specific formula is used as a matrix, the polyurethane open-cell foam is coated and bonded, and the untreated polyurethane open-cell foam is subjected to enhancement modification, so that the high temperature resistance is improved to 180-210 ℃, and the flame retardant property meets the standard of CALTB 117-A, BS 5852; meanwhile, the mechanical property and the aging resistance are improved.
Detailed Description
The invention discloses a food-grade silica gel foam, which comprises polyurethane open-cell foam and organosilicon gel coated and bonded on the polyurethane open-cell foam, wherein the organosilicon gel is a bi-component and comprises a component A and a component B, and the mixing mass ratio is 1: 1; wherein the component A comprises the following raw materials in parts by weight: 20-100 parts of first vinyl silicone oil; 5-50 parts of first MQ silicon resin; 0-5 parts of first reinforcing filler; 10-35 parts of first flame-retardant temperature-resistant filler; 0.1-2 parts of a first dispersing agent; 0.01-0.5 part of platinum catalyst.
The component B comprises the following raw materials in parts by weight: 20-100 parts of second vinyl silicone oil; 5-35 parts of hydrogen-containing silicone oil; 5-50 parts of second MQ silicon resin; 0-5 parts of second reinforcing filler; 10-35 parts of a second flame-retardant temperature-resistant filler; 0.1-2 parts of a second dispersing agent; 0.1-0.5 part of inhibitor; 0.1-5 parts of a coupling agent; 0.01-3 parts of antioxidant; 0.01-2 parts of pigment.
The first vinyl silicone oil and the second vinyl silicone oil are vinyl-terminated polydimethylsiloxane with the viscosity of 1000-20000 cps and the vinyl content of 0.1-5%.
The first MQ silicon resin and the second MQ silicon resin are phenyl vinyl MQ silicon resins self-made by laboratories, the M/Q value is 0.6-0.9, the viscosity is 100-10000 cps, the vinyl content is 1.2% -3.5%, and the phenyl content is 2.0% -20.5%.
The MQ silicon resin is prepared by the following steps,refers to a structure formed by monofunctional building blocks (M, mono) R3SiO1/2And tetrafunctional mer (Q, quad) SiO2The formed siloxane prepolymer can be used as a reinforcing filler of the organic silicon gel due to the special structure, has good transparency, has small influence on the viscosity of the silicon gel, and can prepare the transparent silicon gel with good fluidity; the phenyl vinyl MQ silicon resin (namely PVMQ silicon resin) is characterized in that vinyl (Vi-) and phenyl (Ph-) are introduced on the basis of the MQ silicon resin, an active reaction group is endowed to the MQ silicon resin through the vinyl (Vi-) and high-temperature resistance and high light transmittance are endowed to the MQ silicon resin through the phenyl (Ph-). The invention prepares the phenyl vinyl MQ silicon resin by the silicate synthesis method.
a. Hexamethyldisiloxane is used as an M chain link, and the structural formula is as follows:
b. the structural formula of the modified silicon rubber is shown in the specification, wherein tetraethoxysilane is taken as a Q chain link and is as follows:
c. the structural formula of the modified phenyl dimethoxy silane is shown as follows by taking methyl phenyl dimethoxy silane as a phenyl (Ph-) chain link:
d. tetramethyl divinyl disiloxane is taken as a vinyl (Vi-) chain link and is taken as an end-capping agent, and the structural formula of the end-capping agent is as follows:
mixing the above raw materials, hydrolyzing under acidic condition, and removing ethanol to obtain MQ silicon resin containing phenyl and vinyl.
The preparation steps of the MQ silicon resin are as follows: at 250100ml of 0.2% HCl aqueous solution is added into a ml three-neck flask; under stirring at room temperature, firstly, dropwise adding a mixture of hexamethyldisiloxane, methylphenyldimethoxysilane and tetramethyldivinyldisiloxane in a certain ratio by using a dropping funnel for about 0.5 hour, then heating to 60 ℃, and stirring for reacting for 1 hour; dropwise adding ethyl orthosilicate by using a dropping funnel, wherein the dropwise adding is completed within 0.5 hour, then heating to 115 ℃, and stirring for reacting for 5 hours; cooling to room temperature, adding toluene for extraction, and washing with water to neutrality; collecting toluene layer, introducing N at 100 deg.C2And (4) carrying out reduced pressure distillation for 1-2 hours under the protection to obtain the colorless and transparent phenyl vinyl MQ resin.
f. The synthetic preparation route of the phenyl vinyl MQ silicon resin is as follows:
the structural formula of the phenyl vinyl MQ silicon resin is as follows:
[(CH3)3SiO1/2]m[(CH3)(C6H5)SiO1/2]p[(CH3)2(CH2＝CH)SiO1/2]v(SiO2)q
the first reinforcing filler and the second reinforcing filler are white carbon black, and the white carbon black is fumed silica or precipitated silica, such as commercial product numbers of Kabot M-5, LM-130, LM-150, TS-720, Yingchuang R202 and the like.
The first flame-retardant temperature-resistant filler and the second flame-retardant temperature-resistant filler are one or a combination of more of silica micropowder, aluminum hydroxide and magnesium hydroxide, and are amorphous powder with the shape of 1-10 mu m.
The first dispersant and the second dispersant are respectively a Bike dispersant or a dike dispersant sold in the market, and the specific models are BYK-W9012, BYK-W969, BYK-W980, BYK-W996,
One kind of (1).
The platinum catalyst is a self-made platinum/tetramethyl divinyl disiloxane complex, and the preparation steps are as follows: adding chloroplatinic acid and tetramethyl divinyl disiloxane in a certain proportion into a 100ml three-neck flask with a reflux condenser tube and a thermometer, heating to 120 ℃ under the stirring of a stirrer, and reacting for 2 hours; cooling to room temperature, and filtering to remove platinum black precipitate; the solution was neutralized to pH 7 with sodium bicarbonate, dried with anhydrous calcium chloride, and filtered to remove white solids to obtain platinum/tetramethyldivinyldisiloxane complex.
The hydrogen-containing silicone oil is bi-functional or tri-functional hydrogen-containing polysiloxane, the viscosity is 10-500 cps, and the hydrogen content is as follows: 0.2 to 1.3 percent. The inhibitor is 1-vinyl cyclohexanol; the coupling agent is one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560), 2(3, 4-epoxycyclohexyl) ethyl triethoxy silane, gamma-aminopropyl triethoxy silane (KH-550) and 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane; the antioxidant is one or more of 2112, AO-60(1010), 1076, uv-resistant light stabilizer uv-770; the pigment is one or a combination of carbon black, titanium dioxide, phthalocyanine green and pigment blue 15: 4.
The invention also discloses a preparation method of the food-grade silica gel foam, which comprises the steps of firstly uniformly mixing A, B components of the organic silicon gel in advance, then adding the mixture into a stirring kettle according to the mass ratio of 1:1, stirring for 10-20 min, then defoaming for 3min, completely soaking untreated polyurethane open-cell foam into the silica gel, flatly placing the foam on a steel wire mesh after 5min, rolling the foam for 4-10 times back and forth by using a roller, and then placing the foam into an oven to be cured for 0.5-2.5 h at 110 ℃.
The invention is explained in more detail below in a number of examples:
the first embodiment is as follows:
the component A comprises: calculated by mass parts, 70 parts of 3500cps viscosity vinyl-terminated polydimethylsiloxane, 20 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent), 5 parts of silica micropowder, 20 parts of aluminum hydroxide and 20 parts of dispersant BYK-W90121 are added into a stirring kettle and stirred and mixed at high temperature in vacuum for 2-3 h (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to be less than or equal to 45 ℃, 0.15 part of white carbon black carbo M-52 part and catalyst self-made platinum/tetramethyl divinyl disiloxane complex are added, stirring and mixing is carried out in vacuum for 1-1.5 h, and a 150-mesh filter screen is filtered to obtain the component A.
And B component: calculated by mass parts, 50 parts of 3500cps viscosity vinyl-terminated polydimethylsiloxane, 15 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent), 5 parts of silicon micropowder, 23 parts of aluminum hydroxide, 15 parts of dispersant BYK-W90121 parts and 10760.5 parts of antioxidant are added into a stirring kettle and stirred and mixed for 2 to 3 hours at high temperature under vacuum (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), the heating is stopped, the stirring and mixing are continued, after the temperature is cooled to be less than or equal to 45 ℃, 2 parts of white carbon black carbobet M-52 parts, 2 parts of coupling agent gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane (KH-560), 20 parts of 100cps (the hydrogen content of 0.6 percent) trifunctional hydrogen-containing polysiloxane, 0.1 to 0.5 parts of inhibitor 1-vinyl cyclohexanol, 40.1 parts of pigment blue 15, 1 to 1.5 hours of vacuum stirring and mixing are carried out for 1 to 1., filtering with a 150-mesh filter screen to obtain a component B.
The components A, B of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, the untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃. And cutting according to the corresponding size and then performing performance test.
Example two:
the component A comprises: calculated by mass parts, 50 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 30 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5%, and the phenyl content is 10.4%), 30 parts of phenyl vinyl MQ silicon resin, 5 parts of silicon micropowder, 20 parts of aluminum hydroxide, and 0.15 part of dispersing agent BYK-W90121 are added into a stirring kettle and stirred and mixed at high temperature in vacuum for 2-3 hours (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to be less than or equal to 45 ℃, the R2022 parts of white carbon black and 0.15 part of catalyst self-made platinum/tetramethyl divinyl disiloxane complex are added, stirring and mixing are carried out in vacuum for 1-1.5 hours, and a 150-mesh filter screen is.
And B component: calculated by mass parts, 40 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 20 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent) phenyl vinyl MQ silicon resin, 3 parts of silicon micropowder, 20 parts of aluminum hydroxide, 20 parts of dispersant BYK-W90121 parts, and 10760.5 parts of antioxidant are added into a stirring kettle to be stirred and mixed for 2-3 h at high temperature under vacuum (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), the heating is stopped, the stirring and mixing are continued, after the mixture is cooled to be less than or equal to 45 ℃, adding 2022 parts of white carbon black, 3 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560) serving as a coupling agent, 24 parts of 100cps (0.6% hydrogen content) trifunctional hydrogen-containing polysiloxane, 0.1-0.5 part of 1-vinyl cyclohexanol serving as an inhibitor and 15: 40.1 parts of pigment carbon black, stirring and mixing for 1-1.5 hours in vacuum, and filtering by a 150-mesh filter screen to obtain a component B.
The components A, B of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, the untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃. And cutting according to the corresponding size and then performing performance test.
Example three:
the component A comprises: calculated by mass parts, 50 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 30 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5%, and the phenyl content is 10.4%), 30 parts of phenyl vinyl MQ silicon resin, 5 parts of silicon micropowder, 20 parts of aluminum hydroxide, and 0.15 part of dispersing agent BYK-W90121 are added into a stirring kettle and stirred and mixed at high temperature in vacuum for 2-3 hours (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to be less than or equal to 45 ℃, the R2022 parts of white carbon black and 0.15 part of catalyst self-made platinum/tetramethyl divinyl disiloxane complex are added, stirring and mixing are carried out in vacuum for 1-1.5 hours, and a 150-mesh filter screen is.
And B component: calculated by mass parts, 30 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 20 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent), 3 parts of silicon micropowder, 20 parts of aluminum hydroxide, 20 parts of dispersant BYK-W90121 parts, 10760.5 parts of antioxidant, the components are added into a stirring kettle to be stirred and mixed for 2-3 h at high temperature under vacuum (the vacuum degree is less than or equal to 0.08MPa and the temperature is less than or equal to 120 ℃), the heating is stopped, the mixture is continuously stirred and mixed, after the mixture is cooled to be less than or equal to 45 ℃,3 parts of white carbon black Yingchu R2022 parts, 3 parts of coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560), 10 parts of 100cps (0.6 percent hydrogen content) trifunctional hydrogen-containing polysiloxane, 20 parts of 200cps (0.25 percent hydrogen content) bifunctional hydrogen-containing polysiloxane, 0.1-vinyl cyclohexanol 0.5 part of inhibitor, 15: 40.1 part of pigment, stirring and mixing for 1-1.5 h in vacuum, and filtering by a 150-mesh filter screen to obtain a component B.
The components A, B of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, the untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃. And cutting according to the corresponding size and then performing performance test.
Example four:
the component A comprises: calculated by mass parts, 70 parts of 3500cps viscosity vinyl-terminated polydimethylsiloxane, 20 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent), 25 parts of silicon micropowder, and 20 parts of dispersant BYK-W90121 are added into a stirring kettle and stirred and mixed at high temperature in vacuum for 2-3 h (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to be less than or equal to 45 ℃, white carbon black carbot M-52 parts and catalyst platinum self-made/tetramethyl divinyl disiloxane complex are added, stirring and mixing are carried out in vacuum for 1-1.5 h, and a 150-mesh filter screen is used for filtering to obtain the component A.
And B component: calculated by mass parts, 50 parts of 3500cps viscosity vinyl-terminated polydimethylsiloxane, 15 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent), 28 parts of silicon micropowder, 15 parts of dispersant BYK-W90121 parts, and 10760.5 parts of antioxidant are added into a stirring kettle to be stirred and mixed for 2-3 h at high temperature under vacuum (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), the heating is stopped, the stirring and mixing are continued, after the mixture is cooled to be less than or equal to 45 ℃, adding white carbon black carbot M-52 parts, coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560)2 parts, 100cps (0.6% hydrogen content) trifunctional hydrogen-containing polysiloxane 20 parts, inhibitor 1-vinyl cyclohexanol 0.1-0.5 part and pigment blue 15: 40.1 parts, stirring and mixing for 1-1.5 h under vacuum, and filtering with a 150-mesh filter screen to obtain component B.
The components A, B of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, the untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃. And cutting according to the corresponding size and then performing performance test.
Example five:
the component A comprises: calculated by mass parts, 50 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 30 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5%, and the phenyl content is 10.4%), 10 parts of silica micropowder, 10 parts of magnesium hydroxide, and 30 parts of dispersant BYK-W90121, wherein the components are added into a stirring kettle and stirred and mixed at high temperature in vacuum for 2-3 h (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to be less than or equal to 45 ℃, 0.15 part of white carbon black carbo TS-7202 part and catalyst platinum self-made/tetramethyl divinyl disiloxane complex are added, the components are stirred and mixed in vacuum for 1-1.5 h, and the components A are obtained by filtering with a 150-mesh filter screen.
And B component: calculated by mass parts, 30 parts of 4500cps viscosity vinyl-terminated polydimethylsiloxane, 20 parts of 1000cps (M/Q is 0.8, the vinyl content is 2.5 percent, and the phenyl content is 10.4 percent) phenyl vinyl MQ silicon resin, 8 parts of silicon micropowder, 10 parts of magnesium hydroxide, 20 parts of dispersant BYK-W90121 and 10760.5 parts of antioxidant are added into a stirring kettle to be stirred and mixed for 2-3 h at high temperature under vacuum (the vacuum degree is less than or equal to 0.08MPa and the temperature is 120 ℃), heating is stopped, stirring and mixing are continued, after cooling to the temperature of less than or equal to 45 ℃, adding white carbon black carbot TS-7202 parts, coupling agent gamma-aminopropyl triethoxysilane (KH-550)3 parts, 100cps (0.6% hydrogen content) trifunctional hydrogen-containing polysiloxane 20 parts, inhibitor 1-vinyl cyclohexanol 0.1-0.5 part and pigment carbon black 0.1 part, stirring and mixing for 1-1.5 h in vacuum, and filtering with a 150-mesh filter screen to obtain component B.
The components A, B of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, the untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃. And cutting according to the corresponding size and then performing performance test.
Test results comparison table:
description of the drawings:
(1) the untreated polyurethane open-cell foam is used as a comparative example.
(2) The hardness is measured by a sponge hardness meter, and the thickness is 10 +/-0.2 mm.
(3) The gram weight test thickness is 10 +/-0.2 mm.
The design of the invention is characterized in that: according to the invention, the organic silicon gel with a specific formula is used as a matrix, the polyurethane open-cell foam is coated and bonded, and the untreated polyurethane open-cell foam is subjected to enhancement modification, so that the high temperature resistance is improved to 180-210 ℃, and the flame retardant property meets the standard of CALTB 117-A, BS 5852; meanwhile, the mechanical property and the aging resistance are improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (10)
1. A food-grade silica gel foam is characterized in that: the silicone gel is a bi-component and comprises a component A and a component B, and the mixing mass ratio is 1: 1; wherein the component A comprises the following raw materials in parts by weight: 20-100 parts of first vinyl silicone oil; 5-50 parts of first MQ silicon resin; 0-5 parts of first reinforcing filler; 10-35 parts of first flame-retardant temperature-resistant filler; 0.1-2 parts of a first dispersing agent; 0.01-0.5 part of platinum catalyst;
the component B comprises the following raw materials in parts by weight: 20-100 parts of second vinyl silicone oil; 5-35 parts of hydrogen-containing silicone oil; 5-50 parts of second MQ silicon resin; 0-5 parts of second reinforcing filler; 10-35 parts of a second flame-retardant temperature-resistant filler; 0.1-2 parts of a second dispersing agent; 0.1-0.5 part of inhibitor; 0.1-5 parts of a coupling agent; 0.01-3 parts of antioxidant; 0.01-2 parts of pigment.
2. The food grade silicone foam according to claim 1, wherein: the first vinyl silicone oil and the second vinyl silicone oil are vinyl-terminated polydimethylsiloxane with the viscosity of 1000-20000 cps and the vinyl content of 0.1-5%.
3. The food grade silicone foam according to claim 1, wherein: the first MQ silicon resin and the second MQ silicon resin are phenyl vinyl MQ silicon resins self-made by laboratories, the M/Q value is 0.6-0.9, the viscosity is 100-10000 cps, the vinyl content is 1.2% -3.5%, and the phenyl content is 2.0% -20.5%; the preparation steps are as follows: 100ml of 0.2% HCl aqueous solution was added to a 250ml three-necked flask; under stirring at room temperature, firstly, dropwise adding a mixture of hexamethyldisiloxane, methylphenyldimethoxysilane and tetramethyldivinyldisiloxane in a certain ratio by using a dropping funnel for about 0.5 hour, then heating to 60 ℃, and stirring for reacting for 1 hour; dropwise adding ethyl orthosilicate by using a dropping funnel, wherein the dropwise adding is completed within 0.5 hour, then heating to 115 ℃, and stirring for reacting for 5 hours; cooling to room temperature, adding toluene for extraction, and washing with water to neutrality; collecting toluene layer, introducing N at 100 deg.C2Under the protection, carrying out reduced pressure distillation for 1-2 hours to obtainTo a colorless transparent phenyl vinyl MQ resin.
4. The food grade silicone foam according to claim 1, wherein: the first reinforcing filler and the second reinforcing filler are white carbon black, and the white carbon black is fumed silica or precipitated silica.
5. The food grade silicone foam according to claim 1, wherein: the first flame-retardant temperature-resistant filler and the second flame-retardant temperature-resistant filler are one or a combination of more of silica micropowder, aluminum hydroxide and magnesium hydroxide, and are amorphous powder with the shape of 1-10 mu m.
6. The food grade silicone foam according to claim 1, wherein: the first dispersant and the second dispersant are respectively a Bike dispersant or a dike dispersant sold in the market, and the specific models are BYK-W9012, BYK-W969, BYK-W980, BYK-W996,
Dispers750W、
Dispers650、
One of Dispers 670.
7. The food grade silicone foam according to claim 1, wherein: the platinum catalyst is a self-made platinum/tetramethyl divinyl disiloxane complex, and the preparation steps are as follows: adding chloroplatinic acid and tetramethyl divinyl disiloxane in a certain proportion into a 100ml three-neck flask with a reflux condenser tube and a thermometer, heating to 120 ℃ under the stirring of a stirrer, and reacting for 2 hours; cooling to room temperature, and filtering to remove platinum black precipitate; the solution was neutralized to pH 7 with sodium bicarbonate, dried with anhydrous calcium chloride, and filtered to remove white solids to obtain platinum/tetramethyldivinyldisiloxane complex.
8. The food grade silicone foam according to claim 1, wherein: the hydrogen-containing silicone oil is bi-functional or tri-functional hydrogen-containing polysiloxane, the viscosity is 10-500 cps, and the hydrogen content is as follows: 0.2 to 1.3 percent.
9. The food grade silicone foam according to claim 1, wherein: the inhibitor is 1-vinyl cyclohexanol; the coupling agent is one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane (KH-560), 2(3, 4-epoxycyclohexyl) ethyl triethoxy silane, gamma-aminopropyl triethoxy silane (KH-550) and 2- (3, 4-epoxycyclohexyl) ethyl trimethoxy silane; the antioxidant is one or more of 2112, AO-60(1010), 1076, uv-resistant light stabilizer uv-770; the pigment is one or a combination of carbon black, titanium dioxide, phthalocyanine green and pigment blue 15: 4.
10. A method of manufacturing a food grade silicone foam according to any one of claims 1 to 9, wherein: the A, B components of the organic silicon gel are mixed uniformly in advance, then added into a stirring kettle according to the mass ratio of 1:1, stirred for 10-20 min, defoamed for 3min, untreated polyurethane open-cell foam is completely immersed into the silicon gel, laid on a steel wire mesh after 5min, rolled back and forth for 4-10 times by using a roller, and then placed into an oven for curing for 0.5-2.5 h at 110 ℃.
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| CN113861501A (en) * | 2021-09-30 | 2021-12-31 | 广州市鑫深家居有限公司 | Silica gel cotton pillow and preparation method thereof |
| CN114196067A (en) * | 2021-12-27 | 2022-03-18 | 东莞市博恩复合材料有限公司 | Self-healing gel pad and preparation method thereof |
| CN115584052A (en) * | 2022-10-19 | 2023-01-10 | 吉林大学 | Bionic elastic synergistic co-continuous composite material and preparation method thereof |
| CN115770718A (en) * | 2022-11-09 | 2023-03-10 | 东莞市匠心有机硅科技有限公司 | Coating method for combining colored Thermoplastic Polyurethane (TPU) and liquid silica gel |
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| CN115584052A (en) * | 2022-10-19 | 2023-01-10 | 吉林大学 | Bionic elastic synergistic co-continuous composite material and preparation method thereof |
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