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WO2020077609A1 - Compositions de silicone vulcanisables à température ambiante - Google Patents

Compositions de silicone vulcanisables à température ambiante Download PDF

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Publication number
WO2020077609A1
WO2020077609A1 PCT/CN2018/110958 CN2018110958W WO2020077609A1 WO 2020077609 A1 WO2020077609 A1 WO 2020077609A1 CN 2018110958 W CN2018110958 W CN 2018110958W WO 2020077609 A1 WO2020077609 A1 WO 2020077609A1
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Prior art keywords
composition
silane
accordance
group
tri
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2018/110958
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English (en)
Inventor
Zhiping ZENG
Yi Guo
Ravishankar SUBRAMANIAN
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Dow Global Technologies LLC
Dow Silicones Corp
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Dow Global Technologies LLC
Dow Silicones Corp
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Priority to PCT/CN2018/110958 priority Critical patent/WO2020077609A1/fr
Publication of WO2020077609A1 publication Critical patent/WO2020077609A1/fr
Anticipated expiration legal-status Critical
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    • 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
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
    • 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

Definitions

  • This relates to a low modulus room temperature vulcanisable (RTV) silicone composition which cures to a translucent, low modulus silicone sealant having high movement capability and which is non-staining on substrates used in the construction industry.
  • RTV room temperature vulcanisable
  • RTV compositions One component room temperature vulcanisable (RTV) silicone rubber compositions (hereinafter referred to as “RTV compositions” ) are well known. Generally such compositions comprise an -OH end-stopped diorganopolysiloxane polymer and one or more suitable cross-linking agents designed to react with the –OH groups and thereby cross-link the composition to form an elastomeric sealant product.
  • RTV compositions room temperature vulcanisable silicone rubber compositions
  • Such compositions comprise an -OH end-stopped diorganopolysiloxane polymer and one or more suitable cross-linking agents designed to react with the –OH groups and thereby cross-link the composition to form an elastomeric sealant product.
  • One or more additional ingredients such as catalysts, reinforcing fillers, non-reinforcing fillers, diluents, e.g. plasticisers, flame retardants, solvent resistant additives, biocides and the like are often also incorporated into
  • compositions are generally stored in a substantially anhydrous form to prevent premature cure.
  • the main, if not sole source, of moisture in these compositions are the inorganic fillers, e.g. silica. Said fillers may be rendered anhydrous before inter-mixing with other ingredients or water/moisture may be extracted from the mixture during the mixing process to ensure that the resulting sealant composition is substantially anhydrous.
  • substantially anhydrous means having a water/moisture content of ⁇ 0.5%by weight of the composition.
  • the compositions are stored in suitable containers such as caulking tubes or the like until required for use at which point in time the seal on the container is broken, the RTV composition is applied in whatever form desired and exposed to atmospheric moisture to cure. Upon exposure to atmospheric moisture the composition cross-links to form a silicone elastomer.
  • Low modulus room temperature vulcanisable (RTV) silicone compositions have achieved considerable commercial success because of developments in the construction industry.
  • RTV room temperature vulcanisable
  • a silicone sealant composition comprising a moisture curable composition capable of cure to an elastomeric body, the composition comprising:
  • each R 1 is independently an alkyl group having from one of 1 to 10 carbon atoms
  • each R 2 is independently a monovalent organic group selected from 3, 3, 3-trifluoropropyl, a cycloalkyl group or an aryl group
  • a is 0, 1 or 2
  • d is an integer and e is zero or an integer
  • which hydroxyl end-blocked polydiorganosiloxane has a viscosity at 25°C, of from 5 to 100 Pa. s;
  • each R 3 is individually an alkyl group having from 1 to 6 carbon atoms or an alkenyl group having from 2 to 6 carbon atoms, and R'is an alkyl group having from 1 to 6 carbon atoms.
  • Component (i) of the composition as hereinbefore described comprises one or more hydroxyl end-blocked polydiorganosiloxane (s) of the formula
  • each R 1 is independently an alkyl group having from one of 1 to 10 carbon atoms
  • each R 2 is independently a monovalent organic group selected from 3, 3, 3-trifluoropropyl, a cycloalkyl group or an aryl group; a is 0, 1 or 2, d is an integer and e is zero or an integer.
  • Component (i) has a viscosity at 25°C, of from 5 to 100 Pa. s. Unless otherwise indicated all viscosity measurements herein are made at 25°C in accordance with the ASTM D4287 Cone and Plate Method.
  • Each R 1 may be methyl; ethyl; isomers of: propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, alternatively R 1 may be methyl; ethyl, alternatively each R 1 is a methyl group.
  • Each R 2 is independently cycloalkyl groups such as cyclopentyl and cyclohexyl; and aryl groups such as phenyl, tolyl, xylyl, benzyl, and 2-phenylethyl; each a is 0, 1 or 2, alternatively a is 1 or 2, alternatively a is 2.
  • e + d is an integer such that the viscosity of the polymer at 25°C, is from 5 to 100 Pa. s; alternatively e is zero and d is an integer such that the viscosity of the polymer viscosity at 25°C, of from 5 to 100 Pa. s.
  • the composition will contain from 70 to 93%by weight of component (i) .
  • Component (i) may be a single polymer type as described above or alternatively may be a mixture of polymers as described above.
  • Component (ii) may be any silane cross-linker having at least two or three oximo groups per molecule. It should be understood that to form a cross-linked network if polymer (i) only has two –OH groups per molecule then cross-linker (ii) must have at least 3 oximo groups per molecule, however, if polymer (i) has three or more –OH groups per molecule then the cross-linker may contain only two oximo groups per molecule or may be a mixture of silanes having two oximo groups and silanes having three oximo groups. Typically the oximo groups are ketoximo groups.
  • silane cross-linkers having at least three oximo groups per molecule include tetrakis ketoximosilanes, organotris ketoximosilanes where the organo group is a C 1-6 alkyl group or a C 2-6 alkenyl group, alternatively, methyl, ethyl, n-propyl or vinyl; and oligo (organoketoximosilane) , or mixtures thereof.
  • Preferred ketoximo groups are dialkylketoximo groups whose alkyl groups each independently have 1 to 6 carbon atoms.
  • Each of the alkyl groups of the dialkylketoximo groups may be independently selected from methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl groups; alternatively one alkyl group of the dialkylketoxime is a methyl group and the other alkyl group of the dialkylketoxime is a methyl, ethyl, n-propyl or an isobutyl group.
  • the ketoximo group is an ethyl methyl ketoximo group.
  • silanes as crosslinkers are vinyl tri (methylethylketoxime) silane, methyl tri (methylethylketoxime) silane, ethyl tri (methylethylketoxime) silane, methyl tri (dimethylketoxime) silane, ethyl tri (dimethylketoxime) silane, methyl tri (n-propylmethylketoxime) silane, methyl tri (n-propylmethylketoxime) silane, tris- (methylethylketoximo) phenylsilane and mixtures thereof.
  • silane cross-linkers having two oximo groups include vinyl methyl dioximosilane and/or vinyl ethyl linkers containing two oximo dioximosilane.
  • the cross-linker used may also comprise any combination of two or more of the above dependent on the nature of component (i) as discussed above.
  • the compositions suitably contain crosslinker in at least a stoichiometric amount as compared to the polymer (i) described above.
  • Component (ii) may be present in the composition in a cumulative amount of from 2.5 to 10%by weight of the composition, alternatively from 2.5 to 8%by weight of the composition.
  • the fourth group is suitably a non-hydrolysable silicon-bonded organic group.
  • These silicon-bonded organic groups are suitably hydrocarbyl groups which are optionally substituted by halogen such as fluorine and chlorine.
  • fourth groups examples include alkyl groups (for example methyl, ethyl, propyl, and butyl) ; cycloalkyl groups (for example cyclopentyl and cyclohexyl) ; alkenyl groups (for example vinyl and allyl) ; aryl groups (for example phenyl, and tolyl) ; aralkyl groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen.
  • the fourth silicon-bonded organic groups is methyl.
  • Component (iii) of the composition is a silica reinforcing filler.
  • the silica reinforcing filler may comprise one or more finely divided, silica reinforcing fillers such as high surface area fumed and high surface area precipitated silicas including rice hull ash.
  • the surface area of the silica reinforcing filler (iii) is at least 50 m 2 /g determined using the BET method in accordance with ISO 9277: 2010) .
  • Silica reinforcing filler having surface areas of from 100 to 400 m 2 /g measured using the BET method in accordance with ISO 9277: 2010, alternatively of from 100 to 300 m 2 /g (using the BET method in accordance with ISO 9277: 2010) , may be used.
  • the composition may also include some other fillers such as precipitated and/or ground calcium carbonate as and when considered appropriate.
  • the reinforcing fillers used are substantially anhydrous.
  • the filler (s) may be present in the composition in either an untreated form or in a surface treated form, or if preferred a mixture of both. If treated, they are provided with coatings to render their surface hydrophobic. Treating agents mainly used are selected from, for the sake of example, organosilanes, organosiloxanes, organosilazanes such as hexaalkyl disilazane, or short chain siloxane diols or fatty acids or a fatty acid esters such as stearates. If treated the filler surfaces are rendered hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components because they are wetted by the silicone polymer. These surface modified fillers do not clump, and can be homogeneously incorporated into the silicone polymer. This results in improved room temperature mechanical properties of the uncured compositions.
  • moisture as hereinbefore described means water.
  • the moisture contained within the composition is typically retained by filler.
  • the amount of moisture present in the filler may for example be determined prior to introduction into the composition by extracting the water /moisture from filler samples following the process described in ISO 787-2: 1981.
  • Knowledge of the moisture content of the filler is important if relying on it being anhydrous at the time of introduction into the composition.
  • typically the process used for manufacturing the composition ensures the composition is made under anhydrous conditions, e.g. by mixing under vacuum
  • the proportion of such fillers when employed will depend on the properties desired in the elastomer-forming composition and the cured elastomer.
  • the filler is present in a range of from 4 to 20%by weight of the composition, alternatively from 4 to 15%by weight of the composition, alternatively from 5 to 10%by weight of the composition.
  • Component (iv) of the composition is an adhesion promoter.
  • suitable adhesion promoters include organoalkoxysilanes whose organic radicals are substituted preferably by functional groups.
  • the functional groups are, for example, amino, mercapto or glycidoxy groups, with amino and/or glycidoxy groups being preferred.
  • the alkoxy groups of such organoalkoxysilanes are usually (m) ethoxy groups, i.e., methoxy or ethoxy groups.
  • 3-aminopropyltri (m) ethoxysilane 3- (2-aminoethyl) aminopropyltri (m) ethoxysilane, glycidoxypropyltri (m) ethoxysilane, and 3-mercaptopropyltri (m) ethoxysilane.
  • alkoxy silanes such as aminoalkylalkoxy silanes, epoxyalkylalkoxy silanes, for example, 3-glycidoxypropyltrimethoxysilane and, mercapto-alkylalkoxy silanes and ⁇ -aminopropyl triethoxysilane, reaction products of ethylenediamine with silylacrylates.
  • Isocyanurates containing silicon groups such as 1, 3, 5-tris (trialkoxysilylalkyl) isocyanurates may alternatively or additionally be used.
  • Further suitable adhesion promoters are reaction products of epoxyalkylalkoxy silanes such as 3-glycidoxypropyltrimethoxysilane with amino-substituted alkoxysilanes such as 3-aminopropyltrimethoxysilane and optionally alkylalkoxy silanes such as methyl-trimethoxysilane. epoxyalkylalkoxy silane, mercaptoalkylalkoxy silane, and derivatives thereof.
  • component (iv) is present in the composition in a range of from 0.25 to 3%by weight of the composition, alternatively 0.25 to 2.5%weight, alternatively from 0.4 to 2%by weight of the composition.
  • Component (v) is a suitable condensation cure catalyst; which may be used as the catalyst for the polymerisation reaction in the present invention e.g. organic tin metal catalysts such as triethyltin tartrate, tin octoate, tin oleate, tin naphthate, butyltintri-2- ethylhexoate, tinbutyrate, carbomethoxyphenyl tin trisuberate, isobutyltintriceroate, and diorganotin salts especially diorganotin dicarboxylate compounds such as dibutyltin dilaurate, dimethyltin dibutyrate, dibutyltin dimethoxide, dibutyltin diacetate, dimethyltin bisneodecanoate Dibutyltin dibenzoate, stannous octoate, dimethyltin dineodeconoate, and dibutyltin dioctoate.
  • component (v) the catalyst is present in an amount of from 0.01%to 0.5%by weight of the composition, alternatively 0.01 to 0.25%by weight of the composition, alternatively 0.01 to 0.15%by weight of the composition, alternatively 0.01 to 0.10%by weight of the composition.
  • Component (vi) is an acetamidosilane of the general formula:
  • each R 3 is individually an alkyl group having from 1 to 6 carbon atoms or an alkenyl group having from 2 to 6 carbon atoms, alternatively each R 3 is individually a methyl, ethyl, propyl, vinyl or hexenyl group and R'is an alkyl group having from 1 to 6 carbon atoms, alternatively a methyl, ethyl or propyl group.
  • component (vi) include N, N'- (dimethylsilanediyl) bis (N-ethylacetamide) , N, N'- (methylethylsilanediyl) bis (N-ethylacetamide) , N, N'- (dimethylsilanediyl) bis (N-propylacetamide) , N, N'- (dimethylsilanediyl) bis (N-methylacetamide) , N, N'- (vinylmethylsilanediyl) bis (N-ethylacetamide) or a mixture thereof.
  • Component (vi) is utilized herein as a chain extender in that it reacts with the hydroxyl endblocked polydiorganosiloxane (i) to give a longer polymer.
  • the polymer chain extension provides a polymer with an extended chain length which provides the resulting cured elastomer with a low modulus.
  • the compositions can be packaged with all the reactive ingredients in one package and stored over extended periods of time under anhydrous condition, such as for three months or more. No advantages are experienced in exceeding 10 parts by weight because slower cures and less desirable physical properties are observed.
  • component (vi) will be present in the composition in a range of from 0.05%to 1.5%by weight of the composition, alternatively from 0.075%to 1.0%by weight of the composition, alternatively from 0.075%to 0.75%by weight of the composition, alternatively from 0.15%to 0.5%by weight of the composition.
  • the composition is “substantially plasticiser free” .
  • substantially plasticiser free means that no plasticiser or other diluents, sometimes referred to in the industry as extenders and/or processing aids, are intentionally introduced into the composition but they may be present in very small amounts as contaminants (i.e. ⁇ 1%by weight) .
  • plasticisers and other diluents we mean siloxane materials which will not participate in the cure process of the present composition and/or organic materials as discussed in GB2445821 which is incorporated herein by reference.
  • a variety of conventional additives can be used so long as they are compatible with the remaining constituents of the composition. These may include but are not restricted to pigments, extrusion aids, co-catalysts, dyes, antioxidants, heat stability additives, rheological modifiers, flame retardants, UV stabilizers, fungicides and/or biocides and the like and/or water scavengers.
  • the composition does not include a plasticiser or extender. It will be appreciated that some of the additives are included in more than one list of additives. Such additives would then have the ability to function in all the different ways referred to.
  • the rheological additives include silicone organic co-polymers such as those described in EP 0802233 based on polyols of polyethers or polyesters; non-ionic surfactants selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers or ethylene oxide (EO) and propylene oxide (PO) , and silicone polyether copolymers; as well as silicone glycols.
  • non-ionic surfactants selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers or ethylene oxide (EO) and propylene oxide (PO)
  • silicone polyether copolymers as well as silicone glycols.
  • Heat stabilizers may include metal compounds such as red iron oxide, yellow iron oxide, ferric hydroxide, cerium oxide, cerium hydrate, cerium hydroxide, lanthanum oxide, copper phthocyanine, carbon black, titania, barium zirconate, cerium and zirconium octoates, and porphyrins.
  • Flame retardants may include for example, carbon black, hydrated aluminum hydroxide, and silicates such as wollastonite, platinum and platinum compounds.
  • Electrically conductive fillers may include carbon black, metal particles such as silver particles any suitable, electrically conductive metal oxide fillers such as titanium oxide powder whose surface has been treated with tin and/or antimony, potassium titanate powder whose surface has been treated with tin and/or antimony, tin oxide whose surface has been treated with antimony, and zinc oxide whose surface has been treated with aluminum.
  • Thermally conductive fillers may include metal particles such as powders, flakes and colloidal silver, copper, nickel, platinum, gold aluminum and titanium, metal oxides, particularly aluminum oxide (Al 2 O 3 ) and beryllium oxide (BeO) ; magnesium oxide, zinc oxide, zirconium oxide; Ceramic fillers such as tungsten monocarbide, silicon carbide and aluminum nitride, boron nitride and diamond.
  • metal particles such as powders, flakes and colloidal silver, copper, nickel, platinum, gold aluminum and titanium, metal oxides, particularly aluminum oxide (Al 2 O 3 ) and beryllium oxide (BeO) ; magnesium oxide, zinc oxide, zirconium oxide; Ceramic fillers such as tungsten monocarbide, silicon carbide and aluminum nitride, boron nitride and diamond.
  • Biocides may additionally be utilized in the composition if required. It is intended that the term "biocides” includes bactericides, fungicides and algicides, and the like. Suitable examples of useful biocides, which may be utilized in compositions as described herein, include, for the sake of example:
  • Carbamates such as methyl-N-benzimidazol-2-ylcarbamate (carbendazim) and other suitable carbamates, 10, 10'-oxybisphenoxarsine, 2- (4-thiazolyl) -benzimidazole, N- (fluorodichloromethylthio) phthalimide, diiodomethyl p-tolyl sulfone, if appropriate in combination with a UV stabilizer, such as 2, 6-di (tert-butyl) -p-cresol, 3-iodo-2-propinyl butylcarbamate (IPBC) , zinc 2-pyridinethiol 1-oxide, triazolyl compounds and isothiazolinones, such as 4, 5-dichloro-2- (n-octyl) -4-isothiazolin-3-one (DCOIT) , 2- (n-octyl) -4-isothiazolin-3-one (OIT) and n-buty
  • biocides might include for example Zinc Pyridinethione, 1- (4-Chlorophenyl) -4, 4-dimethyl-3- (1, 2, 4-triazol-1-ylmethyl) pentan-3-ol and/or 1- [ [2- (2, 4-dichlorophenyl) -4-propyl-1, 3-dioxolan-2-yl] methyl] -1H-1, 2, 4-triazole.
  • the fungicide and/or biocide may suitably be present in an amount up to 0.3%by weight of the composition and may be present in an encapsulated form where required such as described in EP2106418.
  • composition may therefore comprise any of the following combinations Component (i)
  • Component (ii) in an amount of from 2.5 to 10%by weight of the composition, alternatively from 2.5 to 8%by weight of the composition;
  • Component (iii) in an amount of from 4 to 20%by weight of the composition, alternatively from 4 to 15%by weight of the composition, alternatively from 5 to 10%by weight of the composition;
  • Component (iv) in an amount of from 0.25 to 3%by weight of the composition, alternatively 0.25 to 2.5%weight, alternatively from 0.4 to 2%by weight of the composition.
  • Component (v) in an amount of from 0.01%to 0.5%by weight of the composition, alternatively 0.01 to 0.25%by weight of the composition, alternatively 0.01 to 0.15%by weight of the composition, alternatively 0.01 to 0.10%by weight of the composition. by weight of the composition;
  • Component (vi) in an amount of from 0.05%by weight to 1.5%by weight of the composition, alternatively from 0.075 to 1.0%by weight, alternatively from 0.075 to 0.75%by weight of the composition; alternatively from 0.15 to 0.5%by weight of the composition; as well as additives as hereinbefore described with the total weight %of the composition being 100%weight.
  • compositions are preferably room temperature vulcanisable compositions in that they cure at room temperature without heating.
  • compositions described herein are chosen so that the composition, when cured for 7 days at 25°C exposed to air having 50%relative humidity, results in a cured silicone elastomer having an elongation of at least 350%, and a modulus at 100%elongation of less than 0.45MPa as tested in accordance with ASTM D412.
  • compositions are preferably made by initially mixing the hydroxyl endblocked polydiorganosiloxane (i) , cross-linker (ii) , filler (iii) and/or the acetamidosilane (vi) sequentially or simultaneously under vacuum with a view to obtaining a homogeneous mixture with a good dispersion of the filler (iii) in the polydiorganopolysiloxane (i) , whilst extracting as much moisture (water) as possible from the composition to render it substantially anhydrous.
  • the adhesion promoter (iv) and catalyst (v) are then introduced in any order or simultaneously and mixed into the composition, optionally under vacuum.
  • Optional additives may be introduced at any suitable point time of the procedure but it is preferred to add them after the polymer (i) and filler (iii) have been mixed as a better filler dispersion takes place. All mixing is preferably undertaken under substantially anhydrous conditions, in order to minimise the moisture content. Once, the mixing has been completed, the final composition is transferred into suitable air-tight, or the like containers for storage under essentially anhydrous conditions. Once one package compositions are made, they are stable; that is they do not cure, if the essentially moisture free conditions are maintained, but will cure to low modulus silicone elastomers when exposed to moisture at room temperature. Although the present compositions are designed as one package compositions, the components could be packaged in two or more packages, if desired.
  • composition as hereinbefore described provides a translucent, low modulus silicone sealant which substantially plasticiser free, has high movement capabilities and is non-staining on construction substrates which may or may not be porous, such as granite, limestone, marble, masonry, glass, metal and composite panels for use as a stain-resistant weather sealing sealant material for construction and the like applications.
  • the Low modulus nature of the silicone elastomer produced upon cure of the composition described herein makes the elastomer effective at sealing joints which may be subjected to movement for any reason, because compared to other cured sealants (with standard or high modulus) lower forces are generated in the cured sealant body and transmitted by the sealant to the substrate/sealant interface due to expansion or contraction of the joint enabling the cured sealant to accommodate greater joint movement without failing cohesively or interfacially (adhesively) or cause substrate failure.
  • Table 1 provides details of the ingredients used in the comparative examples and examples and the short names used to depict them in later Tables.
  • the comparative compositions were made using the following process:
  • step 2 was then subjected to further mixing under vacuum for 15 minutes to ensure good dispersion of the silica filler.
  • the resulting final composition was mixed for a period of a further 10 minutes and subsequently stored.
  • H-bar specimen was prepared using glass substrate on one side and anodized aluminum substrate on another side by the method defined by ISO 8339, and measure the modulus at 100%elongation on tensile machine.
  • Hardness testing on Durometer after the sealant sheet cured at standard condition after 7 days according to ASTM C 661.
  • Extrusion rate was determined as the weight of sealant extruded during 1 minute at 0.62MPa and 23°C from a standard cartridge with metal nozzle, of which the diameter is 0.22 inch (0.65cm) and elongation is 3.0 inch (7.62 cm) .
  • specimen was prepared using float glass substrate on both sides and determined in accordance with ASTM C 719.
  • Comparative example 1 failed the movement capability test and as such did not have a sufficiently low modulus for the current requirements.
  • comparative 2 unreactive plasticiser was added into the composition with a view to obtaining a lower modulus and higher elongation. Whilst this addition enabled the resulting cured sealant to pass the movement capability test it was found that the composition was unsatisfactory because it caused an unacceptable level of staining.
  • the filled composition was then subjected to further mixing under vacuum for 15 minutes to ensure good dispersion of the silica filler;
  • the resulting final composition was mixed for a period of a further 10 minutes and subsequently stored.

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Abstract

L'invention concerne une composition de silicone vulcanisable à température ambiante (RTV) à faible module qui durcit en un matériau d'étanchéité à base de silicone translucide à module faible ayant une capacité de déplacement élevée et qui est non tachant sur des substrats utilisés dans l'industrie de la construction.
PCT/CN2018/110958 2018-10-19 2018-10-19 Compositions de silicone vulcanisables à température ambiante Ceased WO2020077609A1 (fr)

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Cited By (1)

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JP2024521485A (ja) * 2021-06-28 2024-05-31 ダウ シリコーンズ コーポレーション シリコーン組成物及びその調製

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