WO2016132690A1 - Sponge-formable silicone rubber composition and silicone rubber sponge - Google Patents
Sponge-formable silicone rubber composition and silicone rubber sponge Download PDFInfo
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/022—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments premixing or pre-blending a part of the components of a foamable composition, e.g. premixing the polyol with the blowing agent, surfactant and catalyst and only adding the isocyanate at the time of foaming
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- C08J2201/00—Foams characterised by the foaming process
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- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/05—Elimination by evaporation or heat degradation of a liquid phase
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- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
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- C08J2205/06—Flexible foams
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- 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
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- 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
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Abstract
Description
Patent Document 2: Japanese Unexamined Patent Application Publication No. 2005-062534A
Patent Document 3: Japanese Unexamined Patent Application Publication No. 2008-214625A
Patent Document 4: Japanese Unexamined Patent Application Publication No. 2006-265340A
Patent Document 5: Japanese Unexamined Patent Application Publication No. 2011-201951A
(A) 100 parts by mass of a polyorganosiloxane having at least two silicon-bonded alkenyl groups per molecule;
(B) a polyorganosiloxane having at least two silicon-bonded hydrogen atoms per molecule, in an amount such that silicon-bonded hydrogen atoms in component (B) is from 0.4 to 20 moles per 1 mole of alkenyl groups in component (A);
(C) from 20 to 500 parts by mass of water;
(D) a thickening agent, in an amount of from 0.01 to 15 parts by mass per 100 parts by mass of component (C);
(E) from 0.1 to 15 parts by mass of an emulsifier;
(F) from 0.00001 to 2.0 parts by mass of a halogen-containing ion conductor of an alkali metal; and
(G) a hydrosilylation reaction catalyst, in an amount to accelerate a hydrosilylation reaction of the composition.
part A: composition composed of component (A), component (C), component (D), component (E), component (F), and component (G), and not containing component (B);
part B: composition composed of component (A), component (C), component (D), and component (E), and not containing component (B) and component (G);
part C: composition composed of component (B), and not containing component (C), component (D), component (E), component (F), and component (G); or
a three-part sponge-formable silicone rubber composition composed of
part A’: composition composed of component (A), component (G), and, as necessary, component (E), and not containing component (B), component (C), and component (D);
part B’: composition composed of component (B), and, as necessary, component (E), and not containing component (C), component (D), and component (G);
part C’: composition composed of component (C), component (D), and, as necessary, component (F), and not containing component (A), component (B), and component (G);
and to mix the three parts using a mixing apparatus such as, for example, a static mixer or dynamic mixer immediately before submitting to molding. Furthermore, it is preferable to store it as a two-part sponge-formable silicone rubber composition composed of
part A’’: composition composed of component (A), component (C), component (D), component (E), component (F), and component (G), and not containing component (B);
part B’’: composition composed of component (B), and not containing component (C), component (D), component (E), component (F), and component (G);
and to mix the two parts using a mixing apparatus such as, for example, a static mixer or dynamic mixer immediately before submitting to molding.
The viscosity at 25°C (mPa・s) of the polyorganosiloxane is the value measured by a B-type viscometer in conformance with JIS K7117-1, and the kinetic viscosity (mm2/s) is the value measured by an Ubbelohde viscometer in conformance with JIS Z8803.
The density was measured in conformance with JIS K6268.
The hardness was measured using a test piece 6 mm thick in conformance with the test method using a C-type tester (Asker C durometer) set forth in JIS K7312.
The tensile strength and elongation were measured in conformance with JIS K6251.
The compression set was measured after 22 hours at 180°C and 25% compression in conformance with JIS K6262.
The thickness of the center portion and the thickness of the end portion of a test piece for compression set measurement, which was molded using a mold having a cavity with a diameter of 29 mm and thickness of 12.8 mm, was measured and substituted into the following formula to determine the contraction rate.
(Preparation of silica master batch)
100 parts by mass of polydimethylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups having a viscosity of 40,000 mPa・s, 50 parts by mass of fumed silica having a BET specific surface area of 400 m2/g, 10 parts by mass of hexamethyldisilazane, 0.36 parts by mass of tetramethyldivinylsilazane, 2 parts by mass of water, and 0.26 parts by mass of dimethylsiloxane-methylvinylsiloxane copolymer capped at both molecular terminals with dimethylhydroxysiloxy groups having a viscosity of 20 mPa・s (vinyl group content approximately 10.9 mass%) were loaded in a Ross mixer, and after mixing until uniform at room temperature, it was kneaded while heating at 200°C under reduced pressure for 2 hours, to prepare a fluid silica master batch.
(Preparation of aqueous dispersion thickened with inorganic thickening agent)
0.85 parts by mass of smectite clay (organic polymer composite hydrophilic purified bentonite manufactured by Hojun Co., Ltd.; pH 6.5) and 99.15 parts by mass of ion exchanged water were loaded in a homomixer and mixed at room temperature until uniform, to prepare an aqueous dispersion (c-1) thickened with an inorganic thickening agent.
(Preparation of aqueous dispersion thickened with cellulose nanofibers)
10 parts by mass of a 2% aqueous dispersion of cellulose nanofibers (number-average fiber diameter 4 nm) (product name Rheocrysta C-2SP manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and 20 parts by mass of ion exchanged water were loaded in a homomixer and mixed at room temperature until uniform, to prepare an aqueous dispersion (c-2) thickened with cellulose nanofibers.
The silica master batch, component (A), component (C), component (D), component (E), and component (F) were loaded into a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) in the compositions (parts by mass) listed in Tables 1 to 3, and mixed until uniform at 25°C. Then, component (B), component (G), and component (H) were mixed into the obtained mixture in the compositions (parts by mass) listed in Tables 1 to 3 and degassed to prepare sponge-formable silicone rubber compositions. Note that in Tables 1 to 3, SiH/V indicates the number of moles of silicon-bonded hydrogen atoms in the polyorganosiloxane equivalent to component (B) relative to 1 mole of vinyl groups in the polyorganosiloxane equivalent to component (A) in the silicone rubber composition.
(a-1): Dimethylsiloxane-methylvinylsiloxane copolymer capped at both molecular terminals with trimethylsiloxy groups, having a viscosity of 10,000 mPa・s (vinyl group content 0.13 mass%)
(a-2): Dimethylsiloxane-methylvinylsiloxane copolymer capped at both molecular terminals with dimethylvinylsiloxy groups, having a viscosity of 350 mPa・s (vinyl group content approximately 1.17 mass%)
(b-1): Dimethylsiloxane-methylhydrogensiloxane copolymer capped at both molecular terminals with trimethylsiloxy groups, having a kinetic viscosity of 43.5 mm2/s (silicon-bonded hydrogen atom content approximately 0.69 mass%)
(c-1): Aqueous dispersion thickened with inorganic thickening agent prepared in Preparation Example 2 (smectite clay content 0.85 mass%)
(c-2): Aqueous dispersion thickened with cellulose nanofibers prepared in Preparation Example 3 (cellulose nanofiber content 0.67 mass%)
(d-1): Nonionic surfactant (sorbitan fatty acid ester, product name Rheodol SP-O10V manufactured by Kao Corp.; HLB value 4.3)
(d-2): Nonionic surfactant (sorbitan fatty acid ester, product name Rheodol SP-O30V manufactured by Kao Corp.; HLB value 1.8)
(e-1): LiN(SO2CF3)2
(e-2): NaN(SO2CF3)2
(e-3): LiPF6
(f-1): 1,3-divinyltetramethyldisiloxane solution of 1,3-divinyltetramethyldisiloxane complex of platinum (platinum metal content approximately 4000 ppm)
(g-1): Mixture of 2 parts by mass of ethynylcyclohexanol and 98 parts by mass of polydimethylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups having a viscosity of 10,000 mPa・s
Pigment MB: Mixture of 40 parts by mass of Bengara (product name Bayferrox manufactured by Bayer AG) and 60 parts by mass of polydimethylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups having a viscosity of 10,000 mPa・s
Claims (8)
- A sponge-formable silicone rubber composition comprising:
(A) 100 parts by mass of a polyorganosiloxane having at least two silicon-bonded alkenyl groups per molecule;
(B) a polyorganosiloxane having at least two silicon-bonded hydrogen atoms per molecule, in an amount such that an amount of silicon-bonded hydrogen atoms in component (B) is from 0.4 to 20 moles per 1 mole of alkenyl groups in component (A);
(C) from 20 to 500 parts by mass of water;
(D) a thickening agent, in an amount of from 0.01 to 15 parts by mass per 100 parts by mass of component (C);
(E) from 0.1 to 15 parts by mass of an emulsifier;
(F) from 0.00001 to 2.0 parts by mass of a halogen-containing ion conductor of an alkali metal; and
(G) a hydrosilylation reaction catalyst, in an amount to accelerate a hydrosilylation reaction of the composition. - The sponge-formable silicone rubber composition according to claim 1, wherein component (D) is at least one type of thickening agent selected from the group consisting of inorganic thickening agents, cellulose fibers, water-soluble polymers, water-absorbent polymers, hydrophilic composites composed of the inorganic thickening agents and the water-soluble polymers, and hydrophilic composites composed of the inorganic thickening agents and the water-absorbent polymers.
- The sponge-formable silicone rubber composition according to claim 2, wherein the inorganic thickening agent for component (D) is smectite clay.
- The sponge-formable silicone rubber composition according to any one of claims 1 to 3, wherein the component (F) is at least one type of ion conductor selected from the group consisting of MBF4, MClO4, MPF6, MAsF6, MSbF6, MSO3CF3, MN(SO2CF3)2, MSO3C4F9, MC(SO2CF3)3, and MB(C6H5)4, wherein M in the formulas is lithium or sodium.
- The sponge-formable silicone rubber composition according to any one of claims 1 to 4, further comprising (H) a hydrosilylation reaction inhibitor, in an amount of 0.001 to 5 parts by mass per 100 parts by mass of component (A).
- The sponge-formable silicone rubber composition according to any one of claims 1 to 5, further comprising (I) a reinforcing silica fine powder, in an amount of not greater than 30 parts by mass per 100 parts by mass of component (A).
- A silicone rubber sponge obtained by crosslinking the sponge-formable silicone rubber composition described in any one of claims 1 to 6 by a hydrosilylation reaction and then removing water from the obtained silicone rubber, or removing water while crosslinking the composition by a hydrosilylation reaction.
- The silicone rubber sponge according to claim 7, wherein the sponge is a silicone rubber sponge for a fixing member for an image forming device.
Priority Applications (5)
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JP2017542192A JP6688803B2 (en) | 2015-02-16 | 2016-02-02 | Sponge forming silicone rubber composition and silicone rubber sponge |
US15/551,206 US20180057652A1 (en) | 2015-02-16 | 2016-02-02 | Sponge-formable silicone rubber composition and silicone rubber sponge |
KR1020177023201A KR20170118090A (en) | 2015-02-16 | 2016-02-02 | Sponge-forming silicone rubber composition and silicone rubber sponge |
EP16752081.6A EP3259307B1 (en) | 2015-02-16 | 2016-02-02 | Sponge-formable silicone rubber composition and silicone rubber sponge |
CN201680008462.5A CN107406616B (en) | 2015-02-16 | 2016-02-02 | Sponge-formable silicone rubber composition and silicone rubber sponge |
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JP2015027387 | 2015-02-16 | ||
JP2015-027387 | 2015-02-16 |
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EP (1) | EP3259307B1 (en) |
JP (1) | JP6688803B2 (en) |
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EP3388488A4 (en) * | 2015-12-10 | 2019-07-03 | Shin-Etsu Chemical Co., Ltd. | Addition-curable silicone rubber composition and silicone rubber |
CN111148785A (en) * | 2017-09-28 | 2020-05-12 | 日东电工株式会社 | Temporary fixing sheet |
US20210122893A1 (en) * | 2018-02-01 | 2021-04-29 | Dow Toray Co., Ltd. | Sponge-forming silicone rubber composition and silicone rubber sponge |
US11981786B2 (en) * | 2018-02-01 | 2024-05-14 | Dow Toray Co., Ltd. | Sponge-forming silicone rubber composition and silicone rubber sponge |
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JP7300422B2 (en) * | 2020-06-11 | 2023-06-29 | 信越化学工業株式会社 | Addition-curable liquid conductive silicone rubber composition and electrophotographic imaging member |
JP2022178085A (en) * | 2021-05-19 | 2022-12-02 | デュポン・東レ・スペシャルティ・マテリアル株式会社 | Curable silicone composition, sealing agent and optical semiconductor device |
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- 2016-02-02 US US15/551,206 patent/US20180057652A1/en not_active Abandoned
- 2016-02-02 KR KR1020177023201A patent/KR20170118090A/en active IP Right Grant
- 2016-02-02 EP EP16752081.6A patent/EP3259307B1/en active Active
- 2016-02-02 WO PCT/JP2016/000535 patent/WO2016132690A1/en active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3388488A4 (en) * | 2015-12-10 | 2019-07-03 | Shin-Etsu Chemical Co., Ltd. | Addition-curable silicone rubber composition and silicone rubber |
US10851242B2 (en) | 2015-12-10 | 2020-12-01 | Shin-Etsu Chemical Co., Ltd. | Addition-curable silicone rubber composition and silicone rubber |
CN111148785A (en) * | 2017-09-28 | 2020-05-12 | 日东电工株式会社 | Temporary fixing sheet |
KR20200060300A (en) * | 2017-09-28 | 2020-05-29 | 닛토덴코 가부시키가이샤 | Temporary fixed seat |
EP3617259A4 (en) * | 2017-09-28 | 2020-11-18 | Nitto Denko Corporation | Temporary fixing sheet |
KR102545073B1 (en) * | 2017-09-28 | 2023-06-20 | 닛토덴코 가부시키가이샤 | temporary fixed sheet |
US20210122893A1 (en) * | 2018-02-01 | 2021-04-29 | Dow Toray Co., Ltd. | Sponge-forming silicone rubber composition and silicone rubber sponge |
US11981786B2 (en) * | 2018-02-01 | 2024-05-14 | Dow Toray Co., Ltd. | Sponge-forming silicone rubber composition and silicone rubber sponge |
Also Published As
Publication number | Publication date |
---|---|
JP6688803B2 (en) | 2020-04-28 |
EP3259307A4 (en) | 2018-07-25 |
CN107406616A (en) | 2017-11-28 |
US20180057652A1 (en) | 2018-03-01 |
JP2018510931A (en) | 2018-04-19 |
KR20170118090A (en) | 2017-10-24 |
EP3259307B1 (en) | 2019-10-16 |
CN107406616B (en) | 2020-12-22 |
EP3259307A1 (en) | 2017-12-27 |
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