Hydrophobic Dynasylan® diaminofunctional silane is used in adhesives and sealants, and in coatings, to improve the adhesion of amino-reactive resins. Dynasylan® diaminofunctional silane used in coatings, adhesives, & sealants to improve the adhesion of amino-reactive resins. – The Cary Company!. Hydrophobic Dynasylan® diaminofunctional silane is used in adhesives and sealants, and in coatings, to improve the adhesion of amino-reactive resin.
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Dynasylan® 1146 – Hydrophobic Diaminofunctional Silane (55 lb. Pail)
A one-component or two-component silicone formulation including: The entire contents of these applications are hereby incorporated by reference in their entireties. The disclosure relates to one- or two-component silicone formulations, for example, RTV silicones and their usage and to a corresponding silicone component. Silicones are compositions which have been used as dynasylaan or sealants. Such silicones can be formed as one- or two-component silicone formulations and contain as main components a polyorganosiloxane and a fynasylan.
The formulation of moisture-hardening RTV silicones that contain functional silanes, for example, tri- and tetra-functional silanes as cross-linkers is used. Formulations containing functional oligosiloxanes, that is, oligomers of functional silanes are also used. The advantage of such oligomeric dynasykan is, among other things, a distinct reduction of the low-molecular cleavage products that become free during the hardening reaction and therefore of the VOC emissions.
Furthermore, silicone formulations with dynasylah higher flash point and therefore with improved work safety can be formulated. However, silicone polymers, for example OH-terminated polydimethylsiloxanes with viscosities between andmPas are frequently not readily miscible with the functional oligosiloxanes in contrast to the monomers.
Mixtures of these oligomers with silicone oils display phase separation after a short time and are therefore not stable in storage. This is accompanied by changed qualities of the formulated RTV silicones such as reduced reactivity and reduced adhesion. EP-A describes the usage of amino-functional oligosiloxanes as adhesion promoters in adhesive masses and sealing masses based on organopolysiloxanes and silane cross-linkers.
No possibilities for improving the homogeneity of the mixtures are shown.
EP-A describes functional oligosiloxanes and their use as adhesion promoters in adhesive masses and sealing masses. The use of oligomeric silane cross-linkers is not described. EP-A relates to the production of poly 3-aminopropylorganosiloxanes and refers to the possible use in coatings and adhesives.
EP-A refers to the production of aqueous silane polymers in which the functional silanes are used as stabilizers. EP-A describes the use of a condensation product of functional oligosiloxanes as primers for the adhesion buildup for dynasjlan of polyurethane-based adhesive substances and sealing substances on substrates.
As previously explained, mixtures of oligomeric silane cross-linkers with silicone oils display phase separation after a short time and are therefore not stable in storage, which is associated with other disadvantages. There is no solution for this problem in the related art. JP relates to a silicone formulation comprising an organopolysiloxane with hydroxy- or alkoxy residues, a hydrolysable silane or a partial hydrolysate of it and dynaeylan dimethyl siloxane containing hydroxyl or alkoxy residues and with a degree of polymerization of EP A2 describes a silicone formulation containing a cross-linkable polydiorganosiloxane with OH terminal residues, a monomeric silane cross-linker or a condensate of it and an oligodiorganosiloxane containing alkoxy residues.
According to one aspect, a one- or two-component silicone formulation is provided, comprising:.
USA1 – Silicone formulation with improved storage stability – Google Patents
According to another aspect, a silicone component is provided, comprising:. The present disclosure addresses, for example, the problem of this phase dynasyllan and provides means for increasing the miscibility of the oligomeric siloxane cross-linkers dyasylan silicone oils and therefore improving the stability in storage.
Rynasylan was surprisingly found that the addition of certain functionalized oligodimethylsiloxanes improves the miscibility of functional oligosiloxanes with silicone oils. The problem is therefore addressed, for example, by a one- or two-component silicone formulation that comprises a at least one cross-linkable polydiorganosiloxane, b at least one oligomeric siloxane as cross-linker for the polydiorganosiloxane, wherein the oligomeric siloxane is a condensation product of monomeric silane cross-linkers, and c dynadylan least one functionalized oligodimethylsiloxane.
The silicone formulation according to the disclosure concerns a one- or two-component formulation, i.
In the case dynaasylan the two-component silicone formulation, it is exemplary that the first component or polymer component A comprises the at least one polydiorganosiloxane and the second component or hardener component B dynnasylan the at least one oligomeric siloxane and the at least one functionalized oligodimethylsiloxane. In a one-component silicone formulation, the one component contains the polydiorganosiloxane, the oligomeric siloxane dynaslan the functionalized oligodimethylsiloxane.
The one- or two-component silicone formulation can be a silicone formulation that cures at room temperature, that is, an RTV silicone, wherein a one-component RTV silicone is also designated as an RTV 1 silicone and a two-component RTV silicone is also designated as an RTV 2 silicone.
In dynasylab two-component dynwsylan formulation, the cross-linking of the polyorganosiloxane is started by the mixing of the polymer component A containing the polyorganosiloxane with the hardener component Dyhasylan containing the cross-linker. Two-component silicone formulations are condensation-cross-linking Dynasyla 2 systems and addition-cross-linking RTV 2 systems, wherein according to the disclosure, condensation-cross-linking two-component silicone formulations are exemplary as two-component systems.
The one-component silicone formulations are, for example, moisture-curing systems in which the cross-linking of the polydiorganosiloxane takes place by the contact with moisture. The one- or two-component silicone formulation comprises one or more polydiorganosiloxanes. The polydiorganosiloxanes are cross-linkable polydiorganosiloxanes. The polydiorganosiloxanes are, for example, polydimethylsiloxanes.
The polydiorganosiloxanes comprise, for example, functional residues by which a cross-linking is possible. For example, the polydiorganosiloxanes comprise two or more functional residues by which a cross-linking is possible. The reaction between the functional residue of the polydiorganosiloxane and of the functional residue of the cross-linker can take place by a condensation reaction.
Suitable terminal functional residues are those used in the art. Examples for such functional residues of polydiorganosiloxane which are, for example, terminal functional residues are hydrido- hydroxy- vinyl- alkoxy- acetoxy- and ketoxime residues, wherein hydroxy residues are exemplary. Examples are cited in the following. The residues R 4 can stand for phenyl- vinyl or for methyl residues.
R 5 can be hydroxy. Exemplary alkoxy residues are C 1 -C 5 -alkoxy residues and methoxy, ethoxy and propoxy dynasyla exemplary.
Exemplary ketoxime residues are dialkylketoxime residues whose alkyl residues have 1 to 6 C atoms. The two alkyl residues of the dialkylketoxime residues can stand independently of one another for methyl- ethyl- n-propyl- iso-propyl- n-butyl- or iso-butyl residues.
Dnyasylan cases are exemplary in which an alkyl residue of dialkylketoxime stands for a methyl residue and the other alkyl residue of the dialkylketoxime for a methyl- ethyl- n-propyl- or for an iso-butyl residue. The ketoxime residue can stand for an ethyl-methylketoxime residue. The index p stands for a value of 0, 1 or 2. The index m can be selected within wide ranges according to the intended use, dymasylan general in such a manner that a silicone oil is obtained. The index m can be, e. The index m can be selected in such a manner that the polydiorganosiloxane has the viscosity indicated in the following.
The viscosity of the polydiorganosiloxanes used can vary within wide ranges according to the intended use. The polyorganosiloxane or polydiorganosiloxane used in accordance with the disclosure can have, e. The viscosities indicated here and in the following can be determined in accordance with DIN The indicated viscosity values refer to a shear rate of 0.
Exemplary polydiorganosiloxanes are polydimethylsiloxanes with functional terminal residues such as hydrido, hydroxy- alkoxy- acetoxy- and ketoxime residues, wherein hydroxy residues are exemplary. As was previously explained, such polydimethylsiloxanes can be modified by the partial inclusion of other residues such as phenyl instead of methyl. The one-or two-component silicone formulation furthermore comprises one or more oligomeric siloxanes as cross-linkers for the polyorganosiloxane, wherein the oligomeric siloxane is a condensation product of monomeric silane cross-linkers.
Monomeric silane cross-linkers and also oligomeric condensation products of them are cross-linkers for silicone formulations. Monomeric silane cross-linkers are in general silane compounds containing two or more, e. The functional residues can be present at any position of the silane cross-linker and can be bound to an Si atom of the monomeric silane cross-linker.
Reference is made to the previously described exemplary ketoxime residues as examples of oxime residues. These functional residues can be dynasglan at any position of the silane cross-linker and can be bound to an Si atom of the monomeric silane cross-linker.
Monomeric silane cross-linkers can have, e. Examples for R 6 are alkyl residues with 1 to 5 C atoms, for example, dynaslan, ethyl or propyl, vinyl, dynasypan residues, such as phenyl, cycloalkyl residues, such as cyclohexyl, as well as substituted alkyl residues, with 1 to 8 C atoms, for example, methyl, ethyl or propyl, that are functionalized with one or more substituents such as optionally substituted amino NH 2NHR, NR 2wherein R is independently of one another alkyl, aryl or cycloalkylmercapto, glycidoxy, methacrylate, acrylate or carbamato.
Dynasylan® – Hydrophobic Diaminofunctional Silane (55 lb. Pail)
Exemplary ketoxime residues and alkoxy residues have already been previously described. For example, q stands for a value of 0, 1 or 2, for example, for a value of 0 or 1. R 8 is a bivalent alkylene residue, e. The subscript n stands for 0, 1 or 2, for example, 1. Concrete examples from monomeric silane cross-linkers are methyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, propyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2-aminoethylaminopropyltrimethoxysilane, 1,2-bis- trimethoxysilyl ethane, bis- trimethoxysilylpropyl amine, N- n-butyl aminopropyltrimethoxysilane, N-cyclohexylaminomethyltrimethoxysilane, methacryloxymethyltrimethoxysilane, Dynasy,an or the corresponding compounds in which the methoxy residue is replaced by ethoxy, propoxy, oxime or ketoxime.
Other examples are tetramethoxysilane, tetraethoxysilane and tetrapropoxysilane.
The oligomeric siloxane as cross-linker is a condensation product of one or more such monomeric silane cross-linkers. Such oligomeric siloxanes are commercially available, e. Oligomers of functional silanes are complicatedly constructed 3-dimensional compounds. The oligomeric siloxane can be formed, e. The oligomeric xynasylan contains functional residues stemming from the monomeric silane cross-linker.
For example, a first condensation of two tetramethoxysilane molecules results in a dimer that contains six functional residues; the linking is formed from a functional residue of each molecule by condensation. As already explained, the structure of the oligomers formed can be complicated.
The number of functional residues in the dyynasylan can vary according to the dynasykan of condensation, the type of condensation and the monomeric silane cross-linkers used but is at least 2, e. The degree of condensation dynasglan the oligomeric siloxane, that is, the number of the monomeric silane cross-linkers condensed with each other, can vary in wide ranges according to the intended use but can be, e. It is understandable that the degree of condensation, for example, in the case of rather high degrees of condensation, is frequently only an average value.
The amount of the oligomeric siloxane as cross-linker can vary within wide ranges. For example, the oligomeric dynadylan can be present in a 1-component silicone formulation in an amount of 0. Oligomeric siloxanes are used in 2-component silicone formulations as cross-linkers usually substantially only in the hardener component and can be there in amounts of 0.
If the silicone formulation used is a two-component silicone formulation with a polymer component A comprising the at least one polydiorganosiloxane, and with a hardened component B comprising the at least one oligomeric siloxane and the at least one functionalized oligodimethylsiloxane, the weight ratio of polymer component A to hardener component B is, e.
These oligomeric siloxanes cannot be mixed or only poorly mixed with traditional polydiorganosiloxanes, for example polydimethylsiloxanes. This results in problems of the storage stability of formulated silicone products.
These problems can be mitigated or avoided according to the disclosure if molecules are added whose chemical structure is between those of 1164 cited oligomeric siloxanes and those of the polydiorganosiloxanes, for example, of the polydimethylsiloxanes. This is surprisingly the case with functionalized oligodimethylsiloxanes, whose structure is substantially chain-shaped or star-shaped, that is, rather 2-dimensional. The one- or two-component silicone formulation therefore furthermore comprises a dynwsylan oligodimethylsiloxane.
This can be, for example, a linear functionalized oligodimethylsiloxane. The functionalized oligodimethylsiloxane comprises at least one terminal or side functionalizing residue. For example, the functionalized oligodimethylsiloxane does not have more than 20, for example, not more than 10 terminal vynasylan side functionalizing residues. The functionalizing residue comprises as functionalization one or more dynaslan, e. Examples for the functionalizing residues are mercapto, glycidoxy, amino e.