CN113214649A - Simulated bark mold silica gel and preparation method thereof - Google Patents
Simulated bark mold silica gel and preparation method thereof Download PDFInfo
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- CN113214649A CN113214649A CN202110723242.3A CN202110723242A CN113214649A CN 113214649 A CN113214649 A CN 113214649A CN 202110723242 A CN202110723242 A CN 202110723242A CN 113214649 A CN113214649 A CN 113214649A
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- silica gel
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- mold
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000000741 silica gel Substances 0.000 title claims abstract description 42
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 55
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 23
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000006229 carbon black Substances 0.000 claims abstract description 20
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 13
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000839 emulsion Substances 0.000 claims abstract description 8
- ZQZCOBSUOFHDEE-UHFFFAOYSA-N tetrapropyl silicate Chemical compound CCCO[Si](OCCC)(OCCC)OCCC ZQZCOBSUOFHDEE-UHFFFAOYSA-N 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006082 mold release agent Substances 0.000 claims abstract description 6
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 239000003607 modifier Substances 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 9
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 9
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- UWSMKYBKUPAEJQ-UHFFFAOYSA-N 5-Chloro-2-(3,5-di-tert-butyl-2-hydroxyphenyl)-2H-benzotriazole Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC(N2N=C3C=C(Cl)C=CC3=N2)=C1O UWSMKYBKUPAEJQ-UHFFFAOYSA-N 0.000 claims description 4
- YYLGKUPAFFKGRQ-UHFFFAOYSA-N dimethyldiethoxysilane Chemical compound CCO[Si](C)(C)OCC YYLGKUPAFFKGRQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 3
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 3
- TUKWPCXMNZAXLO-UHFFFAOYSA-N ethyl 2-nonylsulfanyl-4-oxo-1h-pyrimidine-6-carboxylate Chemical compound CCCCCCCCCSC1=NC(=O)C=C(C(=O)OCC)N1 TUKWPCXMNZAXLO-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004383 yellowing Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 6
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 5
- 229920002379 silicone rubber Polymers 0.000 description 4
- 239000004945 silicone rubber Substances 0.000 description 4
- IYAZLDLPUNDVAG-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 IYAZLDLPUNDVAG-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012643 polycondensation polymerization Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions 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; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to condensed type mould silica gel, in particular to a simulation bark mould silica gel and a preparation method thereof, wherein the simulation bark mould silica gel comprises a component A and a component B, and the component A comprises hydroxyl-terminated polydimethylsiloxane, methyl silicone oil, modified white carbon black, an anti-aging agent, an internal mold release agent and methyl silicone oil water-based emulsion in parts by weight; the component B comprises ethyl orthosilicate, propyl orthosilicate, isopropanol and organic tin. The condensed type silica gel product prepared by the invention has the advantages of yellowing resistance and ultraviolet irradiation resistance, and also has good demoulding effect; in addition, the use amount of the silazane treating agent is further reduced, so that the preparation cost of the silica gel of the mold is reduced.
Description
Technical Field
The invention relates to condensed type mould silica gel, in particular to simulation bark mould silica gel and a preparation method thereof.
Background
The condensed type mold silica gel is used for manufacturing cement artware, gypsum artware, resin artware, European-style components, automobile tire molds, carbon fiber products, polyurethane products, epoxy resin products, handmade candles, handmade soaps, large statues, architectural decorations, relief furniture, plastic toys and other molds in various industries.
The condensed type mold has good silica gel fluidity, can copy the detailed texture, has good copying effect, simple preparation process operation and more mold turnover times, and the prepared silica gel mold does not deform. However, the condensation type mold silica gel products in the current market still have the problems of difficult mold removal, high preparation cost, easy aging of silica gel and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a bark-simulated mould silica gel, and the prepared condensation type silica gel product not only has the advantages of yellowing resistance and ultraviolet irradiation resistance, but also has a good demoulding effect, and in addition, the using amount of a silazane treating agent is further reduced, so that the preparation cost of the mould silica gel is reduced.
The technical purpose of the invention is realized by the following technical scheme that the simulated bark mold silica gel comprises a component A and a component B, and the components comprise the following components in parts by weight:
the component A comprises:
40-60 parts of hydroxyl-terminated polydimethylsiloxane
30-50 parts of methyl silicone oil
0.2 to 5 portions of anti-aging agent
0.2-2 parts of internal release agent
22-30 parts of modified white carbon black
1-5 parts of methyl silicone oil water-based emulsion
And B component:
40-60 parts of ethyl orthosilicate
10-25 parts of propyl orthosilicate
1-10 parts of isopropanol
15-30 parts of organotin
In the invention, the modified white carbon black is subjected to surface pretreatment by a mixture of a first modifier and a second modifier, the first modifier comprises one or more of methyl or ethoxy terminated polydimethylsiloxane, dimethyldimethoxysilane and dimethyldiethoxysilane, and the second modifier is silazane.
Further, the mass ratio of the modified white carbon black to the first modifier to the second modifier is 100:5-15: 10.
Further, the content of hydroxyl groups on the surface of the modified white carbon black is 7-10/nm2。
In the invention, the anti-aging agent comprises one or more of 2- (2' -hydroxy-3 ', 5' -di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2' -hydroxy-5 ' -tert-octylphenyl) benzotriazole, titanium dioxide, iron oxide, zinc oxide or aluminum hydroxide.
In the invention, the internal mold release agent comprises one or more of methyl silicone oil, polyether modified silicone oil, zinc stearate, Dow Corning 2-1912, Dow Corning 2-3387 or Dow Corning 3527.
In the invention, the viscosity of the hydroxyl-terminated polydimethylsiloxane is 500-80000 mPas, and the structural formula of the hydroxyl-terminated polydimethylsiloxane is shown in the specification
In the invention, the methyl silicone oil is methyl terminated polydimethylsiloxane, the viscosity is 10-350 mPa.s, and the structural formula of the methyl silicone oil is shown in the specification
The invention also aims to provide a preparation method of the simulated bark mold silica gel, which comprises the following steps:
(1) preparing a basic sizing material: adding hydroxyl-terminated polydimethylsiloxane, methyl silicone oil and modified white carbon black into a kneading machine for kneading, then heating for continuous kneading, heating for decompression, cooling, and grinding by a three-roll machine to prepare a basic rubber material;
(2) preparing a component A: adding the basic rubber material, the methyl silicone oil, the anti-aging agent, the internal release agent and the methyl silicone oil water-based emulsion into a dispersion machine for dispersion to prepare a component A;
(3) preparing a component B: placing the ethyl orthosilicate, the propyl orthosilicate, the isopropanol and the organic tin into a reactor, heating and stirring to obtain a component B;
(4) preparing mould silica gel: and mixing the component A and the component B, uniformly stirring, and vulcanizing to prepare the mold silica gel.
Further, in the step (1), the mixture is added into a kneader and kneaded for 1.5-2h at normal temperature, then heated to 145-; in the step (3), the mixture is placed in a reactor and heated to 45-55 ℃.
The invention has the following beneficial effects:
(1) according to the invention, the white carbon black is modified by adopting the mixture of the first modifier and the second modifier, so that the use of silazane is reduced, the use of methyl or ethoxy terminated polydimethylsiloxane, dimethyl dimethoxysilane and dimethyl diethoxysilane modifiers is increased, and the production cost of a silica gel product is effectively reduced;
(2) the aging of the condensed type simulated bark silica gel is delayed by adding an anti-aging agent, so that the prepared silica gel product is yellowing-resistant and ultraviolet irradiation-resistant, and the appearance of the bark silica gel artware can be kept for a long time;
(3) the condensed type silica gel base sizing material contains more hydroxyl groups, and is easy to generate condensation polymerization reaction with the hydroxyl groups on the surface of a base material, so that the demolding effect is influenced.
Detailed Description
Example 1
The component A comprises: 50 parts of hydroxyl-terminated polydimethylsiloxane, 40 parts of methyl silicone oil, 3 parts of anti-aging agent, 1.5 parts of internal mold release agent, 26 parts of modified white carbon black and 3 parts of methyl silicone oil water-based emulsion; and B component: 50 parts of ethyl orthosilicate, 15 parts of propyl orthosilicate, 5 parts of isopropanol and 25 parts of organic tin. (examples 1 to 3 the limits of the components are to be adapted to the ranges given in the claims)
Wherein the viscosity of the hydroxyl-terminated polydimethylsiloxane is 500 mPas, and the structural formula is
Where n is 656. (examples 1-3 the definition of the components is to be adapted to the claims)
Wherein the methyl silicone oil is methyl terminated polydimethylsiloxane with the viscosity of 10mPa & s, and the structural formula of the methyl silicone oil is shown in the specification
The modified white carbon black is subjected to surface pretreatment by a mixture of a first modifier and a second modifier, the first modifier comprises one or more of methyl or ethoxy terminated polydimethylsiloxane, dimethyldimethoxysilane and dimethyldiethoxysilane, and the second modifier is silazane.
Wherein the structural formula of the methyl or ethoxy terminated polydimethylsiloxane is shown in the specification
Wherein the mass ratio of the modified white carbon black to the first modifier to the second modifier is 100:5: 10. Silazane has high activity and is easy to react with hydroxyl on the surface of white carbon black, but the cost of using silazane alone is high, and the embodiment adopts the mixture of silane micromolecules and silazane for surface pretreatment, so that the production cost can be effectively reduced.
Wherein, the hydroxyl content on the surface of the modified white carbon black is 7-10/nm2。
Wherein the anti-aging agent comprises one or more of 2- (2' -hydroxy-3 ', 5' -di-tert-butylphenyl) -5-chlorobenzotriazole (UV-327), 2- (2' -hydroxy-5 ' -tert-octylphenyl) benzotriazole (UV-329), titanium dioxide, iron oxide, zinc oxide or aluminum hydroxide. The use of the anti-aging agent can delay the thermal rearrangement degradation of the main chain of the polyorganosiloxane and the oxidation of the organic groups of the side chain.
Wherein the internal release agent comprises one or more of 50CS methyl silicone oil, polyether modified silicone oil, zinc stearate, Dow Corning 2-1912, Dow Corning 2-3387 or Dow Corning 3527. The internal release agent is added into the silica gel, so that the release effect of the silica gel can be enhanced.
The preparation method of the embodiment comprises the following steps:
(1) preparing a basic sizing material: adding hydroxyl-terminated polydimethylsiloxane, 35 parts of methyl silicone oil and modified white carbon black into a kneader, kneading for 1.5h at normal temperature, heating to 145 ℃, continuing kneading for 1.5h, heating to 175 ℃, decompressing for 2.5h, cooling, and grinding by a three-roll machine to prepare a base rubber material;
(2) preparing a component A: adding the basic rubber material, the rest methyl silicone oil, the anti-aging agent, the internal release agent and the methyl silicone oil water-based emulsion into a dispersion machine for dispersion to prepare a component A;
(3) preparing a component B: placing ethyl orthosilicate, propyl orthosilicate, isopropanol and organic tin in a reactor, heating to 45 ℃ and stirring to prepare a component B;
(4) preparing mould silica gel: and mixing the component A and the component B, uniformly stirring, and vulcanizing to prepare the mold silica gel.
Example 2
This example differs from example 1 in that:
the component A comprises: 40 parts of hydroxyl-terminated polydimethylsiloxane, 30 parts of methyl silicone oil, 0.2 part of anti-aging agent, 0.2 part of internal mold release agent, 22 parts of modified white carbon black and 1 part of methyl silicone oil water-based emulsion; and B component: 40 parts of ethyl orthosilicate, 10 parts of propyl orthosilicate, 10 parts of isopropanol and 15 parts of organic tin.
Wherein the viscosity of the hydroxyl-terminated polydimethylsiloxane is 80000 mPas, and the structural formula is
Wherein the methyl silicone oil is methyl terminated polydimethylsiloxane with the viscosity of 350mPa & s, and the structural formula of the methyl silicone oil is shown in the specification
Wherein the mass ratio of the modified white carbon black to the first modifier to the second modifier is 100:10: 10.
The preparation method of this example differs from that of example 1 in that: in the step (1), 25 parts of methyl silicone oil is added into a kneader to be kneaded for 2h at normal temperature, then the mixture is heated to 150 ℃ to be continuously kneaded for 2h, and then the mixture is heated to 180 ℃ and decompressed for 3.5 h; in step (3), the mixture is placed in a reactor and heated to 50 ℃.
Example 3
This example differs from example 1 in that:
the component A comprises: 60 parts of hydroxyl-terminated polydimethylsiloxane, 50 parts of methyl silicone oil, 5 parts of anti-aging agent, 2 parts of internal mold release agent, 30 parts of modified white carbon black and 5 parts of methyl silicone oil water-based emulsion; and B component: 60 parts of ethyl orthosilicate, 25 parts of propyl orthosilicate, 1 part of isopropanol and 30 parts of organic tin.
Wherein the structural formula of the hydroxyl-terminated polydimethylsiloxane is shown in the specification
Wherein n is 1800.
Wherein the structural formula of the methyl silicone oil is shown in the specification
Wherein the mass ratio of the modified white carbon black to the first modifier to the second modifier is 100:15: 10.
The preparation method of this example differs from that of example 1 in that: in the step (1), 45 parts of methyl silicone oil is added into a kneader to be kneaded for 2h at normal temperature, then the mixture is heated to 155 ℃ to be continuously kneaded for 2h, and then the mixture is heated to 185 ℃ and decompressed for 4 h; in step (3), the mixture is placed in a reactor and heated to 55 ℃. The products of examples 1-3 were tested according to the following performance test methods:
1. measuring the tensile strength and the elongation at break of the silicone rubber according to GB/T528-2009;
2. the tearing strength of the silicone rubber is determined according to GB/T528-2008;
3. measuring the hardness of the silicone rubber according to GB/T531.1-2008;
4. the viscosity of the silicone rubber was determined according to GB/T2794-;
5. film preparation: preparing dumbbell test pieces according to GB/T528-2009, wherein the test pieces are divided into 2 groups, and one group is taken to perform mechanical property test under the standard state, and the test results are shown in Table 1; the other group was placed in a 120 ℃ 300nm UV aging chamber for testing, and the mechanical properties of the samples after 7 days of aging are shown in Table 2.
Table 1: mechanical property test under standard state
Table 2: mechanical properties after aging test
As is clear from tables 1 and 2, the tensile strength of the product was maintained substantially unchanged in the aging test state, the hardness was slightly increased, and the tear strength and the elongation at break were slightly decreased, but the use was not affected.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is conceivable, and the examples presented herein demonstrate the results of applicants' actual experiments. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The simulated bark mold silica gel comprises a component A and a component B, and is characterized in that the components comprise the following components in parts by weight:
the component A comprises:
and B component:
2. the silica gel for artificial bark molds of claim 1, wherein the modified silica white is surface-pretreated with a mixture of a first modifier and a second modifier, the first modifier comprises one or more of methyl-or ethoxy-terminated polydimethylsiloxane, dimethyldimethoxysilane and dimethyldiethoxysilane, and the second modifier is silazane.
3. The silica gel for a simulation bark mold according to claim 2, wherein the mass ratio of the modified white carbon black, the first modifier and the second modifier is 100:5-15: 10.
4. The simulated bark mold silica gel as claimed in claim 1 or 3, wherein the number of hydroxyl groups on the surface of the modified white carbon black is 7-10/nm2。
5. The simulated bark mold silica gel as claimed in claim 1, wherein the anti-aging agent comprises one or more of 2- (2' -hydroxy-3 ', 5' -di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2' -hydroxy-5 ' -t-octylphenyl) benzotriazole, titanium dioxide, iron oxide, zinc oxide or aluminum hydroxide.
6. The simulated bark mold silica gel as claimed in claim 1, wherein the internal mold release agent comprises one or more of methyl silicone oil, polyether modified silicone oil, zinc stearate, Dow Corning 2-1912, Dow Corning 2-3387 or Dow Corning 3527.
7. The simulated bark mold silica gel as set forth in claim 1, wherein the hydroxyl terminated polydimethylsiloxane has a viscosity of 500-
8. The simulated bark mold silica gel as claimed in claim 1, wherein the methyl silicone oil is methyl terminated polydimethylsiloxane with viscosity of 10-350 mPa-s, and the structural formula of the methyl silicone oil is
9. The method for preparing silica gel for a simulated bark mold as claimed in claim 1, comprising the steps of:
(1) preparing a basic sizing material: adding hydroxyl-terminated polydimethylsiloxane, methyl silicone oil and modified white carbon black into a kneading machine for kneading, then heating for continuous kneading, heating for decompression, cooling, and grinding by a three-roll machine to prepare a basic rubber material;
(2) preparing a component A: adding the basic rubber material, the methyl silicone oil, the anti-aging agent, the internal release agent and the methyl silicone oil water-based emulsion into a dispersion machine for dispersion to prepare a component A;
(3) preparing a component B: placing the ethyl orthosilicate, the propyl orthosilicate, the isopropanol and the organic tin into a reactor, heating and stirring to obtain a component B;
(4) preparing mould silica gel: and mixing the component A and the component B, uniformly stirring, and vulcanizing to prepare the mold silica gel.
10. The method as claimed in claim 9, wherein in step (1), the silica gel is kneaded at room temperature for 1.5-2h after being added into a kneader, and then heated to 145-155 ℃ for further kneading for 1.5-2h, and then heated to 175-185 ℃ for decompression for 2.5-4 h; in the step (3), the mixture is placed in a reactor and heated to 45-55 ℃.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001261960A (en) * | 2000-03-16 | 2001-09-26 | Dow Corning Toray Silicone Co Ltd | Heat setting silicone rubber composition |
| CN103467993A (en) * | 2013-08-30 | 2013-12-25 | 东莞兆舜有机硅新材料科技有限公司 | Condensed type die silicone rubber and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001261960A (en) * | 2000-03-16 | 2001-09-26 | Dow Corning Toray Silicone Co Ltd | Heat setting silicone rubber composition |
| CN103467993A (en) * | 2013-08-30 | 2013-12-25 | 东莞兆舜有机硅新材料科技有限公司 | Condensed type die silicone rubber and preparation method thereof |
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Application publication date: 20210806 |