DE1167526B - Process for the production of shaped structures from organopolysiloxane molding compositions which contain ammonia or basic amino compounds - Google Patents

Description

Process for the production of shaped structures from organopolysiloxane molding compounds, which contain ammonia or basic amino compounds. Attempts have been made for a long time - Time, even organopolysiloxane molding compositions that cure at room temperature, their organopolysiloxane content in contrast to the organopolysiloxane molding compounds that cure to form elastomers is composed almost exclusively of diorganopolysiloxane units. Combinations of organopolysiloxanes and organic polymeric compounds have been made used successfully. The addition of any organic compounds to one Organopolysiloxane, however, must necessarily have physical properties the resulting molded parts have a damaging effect, since "organic resins" are less resistant to aging are called organopolysiloxanes. It is also known to use organopolysiloxanes Cure heating using amines as catalysts. Until now it was But it is not yet possible to use organopolysiloxanes, which are not only almost exclusively are built up from diorganosiloxane units, with the help of amines at room temperature to harden.

The inventive method for producing shaped structures from organopolysiloxane molding compounds with organosilicon compounds, the Si-bonded Hydroxyl groups and SiOC-bonded, monovalent, optionally substituted hydrocarbon radicals or contain hydrocarbon ether residues and possibly other additives, by hardening with at least 0.01 percent by weight ammonia, hydrazine or basic Amino compounds that have a basic dissociation constant at 25 C in dilute aqueous solution between 10-7 and 10 1 are characterized in that the organopolysiloxanes used on average 0.9 to 1.9 Si-bonded monovalent, optionally per Si atom have substituted hydrocarbon radicals or hydrocarbon ether radicals, being in the organosilicon compounds that are not covered by the above radicals or groups of saturated valences are saturated by siloxane oxygen atoms.

The inventive method enables one at room temperature feasible curing of organopolysiloxanes of the type defined above without using them of organic polymers.

The Si-bonded organic radicals are in the following with »R <(, the SiOC-bonded organic radicals in the following with "R" (denoted.

The radicals R can be any monovalent hydrocarbon radicals or Be hydrocarbon ether radicals which can be substituted with any groups, as far as the reaction according to the invention is thereby achieved, for example by reaction with the catalyst used Amine, is not affected. Non-disruptive groups are for example the hydroxyl group, the fluorine atom or any halogen atoms bonded to aromatic radicals.

Examples of R are alkyl radicals, alkenyl radicals, cycloalkyl radicals, Cycloalkenyl radicals, aryl radicals, alkaryl radicals or aralkyl radicals called. Examples for halogenated aromatic monovalent hydrocarbon radicals are 2,4,6-trichlorobenzyl, Perchlorphenyl, 2-bromonaphthyl or p-iodophenylethyl radicals. Examples of fluorinated monovalent hydrocarbon radicals are 3,3,3-trifluoropropyl-, cc, or, or- trifluorotoluyl-, 5,5,5-trifluoro-2-trifluoromethylamyl or the p-fluorophenyl radical. As examples monovalent hydrocarbon radicals containing hydroxyl groups are the 4-ethyl-4-hydroxyhexyl, 3-Hydroxyallyl, cresyl, p-hydroxyphenyl or the p-hydroxycyclohexylethyl radical called.

Examples of hydrocarbon ether residues are - CH2CH2OCH2CH3-, CH2 (0CH2CH2) 20CH3-, CH2OCH2CH = CH2-, - CH2CH2CH2CH2CHOHCH2OCH3-, - CH2CH2OCH2CHOHCH29CH2CHOHCH3 residue, furfuryl residues, the - CF2CF2OCF2CF3-, or the CH2CH2CH20CH2CHOHCH2 X Cl radical.

The R 'radicals can be any of the radicals listed under R, however, the total number of carbon atoms and any ether-oxygen atoms present should preferably not exceed 10 in the R 'radicals. If R 'is larger, it hardens the resin practically not at room temperature.

The Si-bonded hydroxyl groups and the SiOR 'groups can be in be present in the same molecule or in different molecules. the However, the presence of both types of groups is essential.

The organosilicon compounds to be treated with the amine can from essentially homopolymeric organopolysiloxanes, co-polymeric organopolysiloxanes, Silanols or silanes of the formula RnSi (GR ') 4n, in which n is 1, 2 or 3, or from Mixtures of two or more of the compounds mentioned exist. Possibly Mixtures of the organosilicon mixtures and orthosilicic acid esters mentioned can be used and / or polysilicic acid esters can be used. It is preferred in all cases at least one organic silicon compound that is at least trifunctional, d. H. per molecule at least at least three SiOH and / or SiOR 'groups are used. Most of the organosilicon compounds used should at least be difunctional, although a small proportion of monofunctional compounds does not hurt. The upper limit for the functionality is only set by the Changes in the physical properties of the end product when the R is reduced to Si ratio determined. Resins with an R to Si ratio of less than 0.9 / 1 are so brittle that their economic value is doubtful, especially if coatings are to be made from it.

The organic silicon compounds used in the present invention can, for example, have the following formulas: R3Si (OR '), R2Si (OR') 2. RSi (OR ') 3, Si (OR ') 4, R3Si (OH), R2Si (OH) 2 * R2Si (OH) (OR'), RSi (OR ') 2 (0H), Si (OR') 3 (OH), (R ' 0) 3SiOSi (OR ') 3.

R R2 R2 R2 (R'0) 2SiOSi (OH), HOSiOSiOH, R3SiO [Si (OR ') 2O] ySiR2 (OH), R (R'O) 2SiO (SiR2O) zSi (OR') 3 or The indices represented with letters in the formulas can have any positive value.

When performing the method according to the invention, preference is given to a mixture of two components is used, one of which is made from organopolysiloxanes with at least two functional groups in the molecule and the other from polyfunctional Alk- or aroxysilicon compounds with at least three and preferably more functional Groups in the molecule. The organopolysiloxane component preferably has one R to Si ratio of 1 to 1.9 and at least two Si-bonded hydroxyl groups in the molecule, where the R groups are preferably methyl and phenyl radicals and the ratio of the phenyl radicals to the Si atoms in the organopolysiloxane between 0.25: 1 and 1.0: 1.

There may be some SiOR 'groups in it, but yours should be Number should be as small as possible so that the structure is easier to control.

The polyfunctional alk- or aroxysilicon compounds can made entirely of molecules of the formula R (R'O), Si or their partial hydrolyzates, for example R (R'O) 2SiO [SiR (OR ') O] £ SiR (OR') 2 or R (R'O) 2SiOSiR [OSiR (OR ') 2J2. Preferably however, they consist of molecules of the formula (R'O) t, gSiO 4 in where R 'the above Has meaning and m can be 2, 3 or 4. In the present description referred to the term "orthosilicic acid ester" (a compound of the formula (R'O) 4Si; der The term »PolkieselsRureester« refers to compounds of the formulas (R'O) 3SiOSi (OR ') 3, [Si (OR '), O] ,, where y is at least 3, Si (OR') 2OSi (OR ') 3 O (R'O) 3 SiOSi (OR') OSi (OR ') 3 or (R'O) aSiO [Si (OR ') 20] wSi (OR') 3, where x is at least 1. According to the invention Polysilicic acid esters that are effectively used are partial hydrolysates which are soluble in solvents the orthosilicic acid ester.

Mixtures of orthosilicic acid esters are also suitable according to the invention, trifunctional silanes and their partial hydrolysates, as well as mixed hydrolysates of these Fabrics. Examples of such mixed hydrolysates are: Si (OR ') 3 0 (R'O) 2RSiOSiROSi (OR') 2OSi (OR ') 2R, (R'O) 2RSiO [Si (OR ') 20jyOSiR (OR) 2 or (RO) 2RSiOSi (OR) 2O] zSi (OR) 3, where x is at least 1.

The amino compound used as a curing catalyst can be ammonia, a primary, secondary or tertiary amine or any mixture thereof be.

Examples of amines used according to the invention are: Secondary Butylamine, diethylbenzylamine, diethylamine, diisoamylamine, diisobutylamine, dimethylamine, Dimethylaminomethylphenol, dimethylbenzylamine, dipropylamine, ethylamine, ethylenediamine, Hydrazine, isoamylamine, isobutylamine, isopropylamine, diaminomethane, methylamine, methyl diethylamine, t-octylamine, t-nonylamine, piperidine, n-propylamine, t-octadecylamine, brucine, cocaine, Quinine, tetramethylenediamine, triethylamine, triisobutylamine, trimethylamine, trimethylenediamine, Tripropylamine, L-arginine, L-lysine, aconitine, benzylamine, cinchonidine, codeine, coniine, Emitin, ethanolamine, o-methoxybenzylamine, m-methoxybenzylamine, p-methoxybenzylamine, N, N - methoxybenzylamine, o-methylbenzylamine, m-methylbenzylamine, p-methylbenzylamine, N, N-methylbenzylamine, morphine, nicotine, E-phenylamylamine, ö-phenylbutylamine, ß-phenylethylamine, B-phenylethylmethylamine, y-phenylpropylamine, p-aminobenzoic acid diethylaminoethyl ester, N, N-isopropylbenzylamine, physostigmine, piperazine, quinidine, solamine, sparteine, thebaine, tert-butyl-2,4-dinitrophenylamine, tert-butyl-2-hydroxy-5-nitrobenzylamine, tert-butyl-4-isonitrosoamylamine, t-Octylamylamine, t-Octyl - 2 - (ß -butoxyethoxy) - ethylamine, 2,4,6-tris (dimethylamino) phenol or Veratrin. Condensation products of aliphatic aldehydes and are also suitable aliphatic primary amines, for example the condensation products of formaldehyde and methylamine, from acetaldehyde and allylamine, from crotonaldehyde and ethylamine, of isobutyr aldehyde and ethylamine, from acrolein and butylamine from., ß-dimethylacrolein and amylamine, from butyraldehyde and butylamine, from acrolein and allylamine or from Formaldehyde and heptylamine.

When using ammonia as a catalyst, either the organosilicon mass becomes exposed to a stream of ammonia in the closed system or the ammonia is in formed in situ, for example by the breakdown of a compound such as ammonium carbonate on contact with the organosilicon mixture.

Suitable amino compounds are also those in patent 1,090,399 named silanes and their partial hydrolysates. These silanes have the general Formula (R'O) 3SiR "Zn, where R 'is an alkyl radical with fewer than 4 carbon atoms, R" is an aliphatic one Hydrocarbon radical with 1 or more than 2 carbon atoms and a valence of n +1, where n is at least 1, and Z is a monovalent, to R "through a carbon-nitrogen bond bonded residue consisting of hydrogen, carbon and nitrogen atoms is. Z contains at least two amino groups, and the ratio of carbon atoms to nitrogen atoms in the silicon substituent - R "Zn is less than 6: 1. Your Production takes place in a known manner by reacting a polyamine with a Halocarbon trialkoxysilane in which the halogen is not attached to a p-position to the silicon located carbon atom is bonded. The halocarbon trialkoxysilanes are by halogenating an alkylhalosilane and subsequent alcoholysis of the Si-bonded halogen or obtained according to French patent 961 878.

The partial hydrolysates of the silanes result from the hydrolysis of some R'O groups with the subsequent condensation of the silanols with the formation of SiOSi bonds. Examples are: (CH3O) 3Si (CH2) 3NHCH2CH2NH2 or (CH3O) [Si (OCH3) (CH2CH2CH2NHCH2CH2NH2) O] 2Si (OCH3) 2 (CH2CH2CH2NHCH2CH2NH.

Examples of catalysts are those in patent 869,956 mentioned disiloxanes of the formula O [si (cH3) 2 (cH2) nNH2] 2 silanes of the formulas [C6H5CH3Si (CH2) n] 2CHNH2 or [cH3si (cH2) n] 2cHNH2 according to US Pat. No. 2,662,909, the aminomethylsiloxanes according to German patent 888 694, or the aminomethylsilanes or silcarbazanes according to German Patent 881,654 effective. The compounds of U.S. Patent 2,832,754, for example (C2H5o) 3SiCH2CH2cH2NH2 are also effective.

Compounds of the formula (CH3) 3SiOCH2CH2CH2NH2, for example, can also be used as amines or (C2H50) 3SiOCH2CH2CH2NHCH2CH2NH2 by reacting an alkanolamine with a halosilane and, if necessary, subsequent alcohol holysis are used will. These amino compounds can also be used as alk- or aroxysilicon compounds at the same time to serve.

The ratio of the components to one another can be arbitrary and is determined only on the basis of practical considerations. When using the three-component system Organopolysiloxane, silicic acid ester and amine can be any two of the three components can be stored as a mixture without any significant change entry. Only after all three components have been mixed, possibly in one Solvent, curing starts spontaneously at room temperature.

The curing rate depends on the concentration of SiOR 'groups and SiOH groups and on the basicity of the mixture. To the number of variables to reduce, is preferably, as indicated above, one of two components Existing organosilicon mixture is used, with the organopolysiloxane component (1) essentially only SiOH groups and the other component (2) essentially contains only SiOR 'groups. One molecule of component (2) is preferably Si-bonded Hydroxyl group present in component (1) and so much amine hydrazine or ammonia present that the mixture is basic, d. h., the pH must be greater than to be 7. Advantageously, there are also no more than 10 parts of the component (2) or 10 parts of amine per 100 parts of component (1) are present, because this the curing speed can be regulated more easily.

Additives can also be used in the process according to the invention which are usually added to organopolysiloxanes. Additions, like pigments and light stabilizers, preferably incorporated into the mass, they can but can also be added separately or together with the amine.

The mixtures processed according to the invention can be used as color or Lacquer coating on wood, metal, glass, ceramic surfaces etc. in 24 hours Cure to a hard, dry film at room temperature in air. The application can be done by brushing, spraying or dipping.

At first there is gelling on the surface, followed by hardening occurs in the film itself. The entire mixture can be applied; it but individual components of the mixture can also be applied, which then after introducing the third component, for example by spraying on a silicic acid ester, Amine or a polysiloxane solution, or by the action of vapors, for example from Ammonia, or a volatile amine, can be turned into a solid coating.

In the examples below, means unless otherwise stated is, the term "ÄPS" is an ethyl polysilicate with a viscosity of 12.2 at 25 "C, containing 21.6 percent by weight silicon and 64.8 percent by weight ethoxy radicals. All parts and percentages in the examples are unless otherwise stated based on weight.

Example 1 10 g of a 600/0 toluene solution of a copolymer from 68 mole percent monomethylsiloxane and 32 mole percent monophenylsiloxane units, containing about 0.2 0 / o Si-bonded hydroxyl groups, with 0.1 g of a mixture mixed from 2 parts of ÄPS and 1 part of di-n-amylamine.

The mixture is painted on a cedar wood panel. The emerging The coating gels to a tack-free state in air at room temperature in 30 minutes and hardens in 24 hours.

Example 2 10 g of a 500/0 xylene solution of a copolymer from 35 mol percent phenylmethylsiloxane, 10 mol percent dimethylsiloxane, 25 mol percent monomethylsiloxane and 30 mole percent monophenylsiloxane units containing about 0.1% Si-bonded Hydroxyl groups, with 0.17 g of the mixture of ÄPS and di-n-amylamine according to Example 1 mixed.

A coating of this mass on a cedar wood plate gels in 15 minutes in air at room temperature and cures in 16 hours under the same Conditions.

Example 3 10 g of a 600/0 strength toluene solution of a copolymer from 29.3 mole percent dimethylsiloxane, 32.0 mole percent monomethylsiloxane and 38.7 Mole percent monophenylsiloxane units containing about 0.1 0 / o Si-bonded hydroxyl groups, be with 0.17 g of the mixture of ÄPS and di-n-amylamine according to Example 1 mixed.

A coating of this mass on a cedar wood panel hardens in 4 to 5 hours.

Example 4 10 g of the polysiloxane solution according to Example 2 are added 0.11 g of ÄPS and 0.11 g of di-n-amylamine mixed.

A coating of this mass on a cedar wood panel hardens in 24 hours in air at room temperature.

Example 5 28.9 g of the polysiloxane solution according to Example 2 are added 0.75 g ÄPS and 0.4 g di-n-amylamine mixed. The mass hardens as a coating on one Cedar wood panel in 24 hours in air at room temperature.

Example 6 2 g of a 500/0 xylene solution of a copolymer from 35 mol percent phenylmethylsiloxane, 10 mol percent dimethylsiloxane, 25 mol percent monomethylsiloxane and 30 mole percent monophenylsiloxane units containing about 80 / o Si-bonded Hydroxyl groups, with 0.15 g of the mixture of ÄPS and di-n-amylamine according to Example 1 mixed. The mass hardens partially as a coating on a cedar wood panel in 5 hours in air at room temperature.

The experiment is carried out using 0.3 g of the mixture of ÄPS and di-n-amylamine repeated. The rate at which a coating cures from this The mass on wood is roughly twice that of the mixture mentioned above.

Example 7 42.5 g of the polysiloxane solution according to Example 2 are added Diluted 20 g of toluene and mixed with 0.75 g of ÄPS and 0.4 g of diamylamine. The crowd is applied to a cedar wood panel. After curing in air for 1 1/2 hours a second coating is applied at room temperature, which becomes tack-free in 2 hours Condition gels and hardens in 16 hours.

Example 8 59.1 g of a 570/0 toluene solution of the polysiloxane according to Example 6, 1.19 g of ÄPS and 0.65 g of di-n-amylamine are mixed. The crowd hardens quickly in the air as a coating on a cedar wood panel.

A second coating gels on the in 2 hours at room temperature Air to tack-free state.

Example 9 46.25 g of the polysiloxane solution according to Example 2 are obtained 0.7 g of ÄPS and 0.4 g of dodecyldimethylamine are added. A coating from this mass on a cedar wood plate gels in air in 30 minutes at room temperature almost tack-free condition.

Example 10 55 g of a 600/0 xylene solution of a copolymer from 35 mole percent phenylmethylsiloxane, 10 mole percent dimethylsiloxane, 25 mole percent Monomethylsiloxane and 30 mole percent monophenylsiloxane units contain 3 to 4 percent by weight of Si-bonded hydroxyl groups are mixed with 1 g of ÄPS and 0.5 g of dodecyldimethylamine offset. A cover this mass is transferred to a cedar wood panel applied; after only 1 hour of exposure to air at room temperature it is only more slightly sticky.

Example 11 28 g of the polysiloxane solution according to Example 10 are added 0.08 g of ethyl orthosilicate and 0.04 to 0.05 g of di-n-amylamine are mixed. on A cedar wood plate is applied to the mass after 1 6 hours of hardening Air cured so much at room temperature that a second coating would not replace the first softened.

Example 12 28.08 g of the polysiloxane solution according to Example 10 are obtained mixed with 8.25 g of ethyl orthosilicate and 0.05 g of di-n-amylamine. The crowd hardens as a coating on a cedar wood panel in 16 hours at room temperature the air.

It becomes the same mass with the addition of 0.08 g of tri-n-amylamine manufactured. As a coating on a cedar wood panel, it hardens in less than 6 Hours at room temperature in air.

Example 13 20.29 g of a 30% strength xylene solution of a copolymer from 55 mole percent phenylmethylsiloxane, 30 mole percent monomethylsiloxane and 15 Mole percent monophenylsiloxane units containing about 1.0 weight percent Si-bonded Hydroxyl groups are treated with 1.0 g of the orthosilicic acid ester of ethylene glycol monomethyl ether and 0.5 g of di-n-amylamine mixed. The mixture gels in 2 minutes.

Example 14 In each case 1 g of sec-butylamine, ethylenediamine, Piperidine, coniine, ethanolamine, o-methoxybenzylamine, piperazine, N, N-isopropylbenzylamine and sparteine mixed with 40 g each of the polysiloxane solution according to Example 10 and 2 g of ÄPS. The resulting compositions harden as coatings on wood at room temperature in the air a tack-free gel in 16 hours.

Example 15 In each case 2 g of the condensation product of Ethylamine and formaldehyde, namely (CH3) 3SiOCH2CH2CH2NH2, (CH3) 3SiCH2NHC3H7, [(CH3) 3SiCH2] 2NH, (CH3) 3SiCH2NHC6Hs, (CH3) 3 (C6H5) SiCH2NH2, (CH3) 3SiCH2N (CH3) 2, (CH3) 3SiCH2NHCH2CH2OH, (CH) 2 (C2H5O) SiCH2NHC6H11, C3H7NHCH2Si (CH3) 2OSi (CH3) 2CH2NHC3H7, [(CH3) 3SiCH2CH2] 2CHNH2, [NH2CH2CH2Si (CH3) 2] O, (C2Hso) 3SiCH2cH2cH2NH2 and (CH3O) 3 Si (CH2) 3NHCH2CH2NH2 with 40 g each of the polysiloxane solution according to Example 10 and 2 g of ÄPS mixed; it will Obtain masses that are excellent as coatings on wood and in 24 hours cure to a tack-free state at room temperature in air.

Example 16 A wooden board is made with a mixture of 40 parts by weight the polysiloxane solution according to Example 10 and 2 parts of ÄPS coated and then at Room temperature exposed to a stream of ammonia gas for 4 hours. The coating hardens to a tack-free gel.

Example 17 In each case 0.5 g Si [O (CH2CH2O) 2C2H5] 4, 2 g Si (OCbH11) 4, 1.5 g Si (OCH2 - CH = CH2) 4, 3 g Si (OC6H14, 3 g Si (OCH2CH2OCH = CH2) 4, 2 g Si (OCH3) 3 (OCßH4Cl), 6 g Si [OC6HCH3) OH] 4, 8 g Si (OCH2C2Fs) 4, 5 g (CF3CH2O) aSiOSi (OCH2CF3) 3, 4 g ( C3H7O) 3SiO [Si (OC3H7) 2O] 3OSi (OC3H7) 3, 0.2 g [(CH3OCH2CH2O) 2Si] 2O, 4 g C6H5Si (OCH2CH2OCH3) 3, CH3 4 g CH2 = C - CH2Si (OCH2CH2OCH3) 3, 6OCH3) 3 g CSHDSi (OCH3) 3, 4 g CF3CH2CH2Si (OCH2CH2OCH = CH2) 3, 4 g Cl - C6H4 - Si (OCH2CH = CH2) 3, 4 g CH3CHOHCH2OCH2CHOHCH2OCH2CH2Si (OCH2CH2OCH3) 3, 4 g CH3Si (OC2H5) 2O [Si (OC4HD) 2O] 3 [Si (CβHs) (OC2H5) O] 2Si (OC3H7) 3 and 4 g [Si (OC2H5) 3 and 4 g [Si (OC2H5) 3 and 4 g 167 g each of the polysiloxane solution according to Example 10 and 2 g of n-hexylamine are mixed. The resulting compositions harden as coatings on wooden panels in less than 24 hours in air at room temperature to form a tack-free gel.

For example 18 OH 20 g HOSi (C8H5) (CH3) OSi (CH3) 2OSi (C8H5) OSi (CH3) 2OSi (C8H5) (CH3) OH are mixed with 1 g of ÄPS and 1 g of piperidine. The resulting mass hardens as Coating on wood in air at room temperature in 24 hours to a tack-free one For example, 19 20 g of a 50 percent strength by weight xylene solution of a copolymer from 31.4 mole percent phenylmethylsiloxane, 34.0 mole percent monomethylsiloxane and 34.6 Mole percent monophenylsiloxane units containing 0.75 weight percent Si-bonded Hydroxyl groups, a 75 weight percent toluene solution of a mixture of (1), 50 percent by weight of a copolymer of 75 mol percent monomethylsiloxane, 24 Containing mole percent dimethylsiloxane and 1 mole percent trimethylsiloxane units 0.4 weight percent Si-bonded hydroxyl groups, and (2) 50 weight percent one Copolymers of 25 mol percent monomethylsiloxane, 35 mol percent monophenylsiloxane, Containing 20 mole percent dimethylsiloxane and 20 mole percent diphenylsiloxane units 4.8 weight percent Si-bonded hydroxyl groups, a 60 weight percent xylene solution a mixed polymer of 22 mol percent isopropylvinylsiloxane, 30 mol percent monophenylsiloxane, 5 mole percent monohexylsiloxane, 1 mole percent monooctadecylsiloxane, 1 mole percent Monocyclopentylsiloxane, 1 mole percent monobenzylsiloxane and 40 mole percent diethylsiloxane units, Contains 2.0 percent by weight of Si-bonded hydroxyl groups, one 50 percent by weight Xylene solution of a mixed polymer of 85 mole percent monophenylsiloxane, 10 mole percent Dimethylsiloxane and 5 mole percent diphenylsiloxane units containing 3.5 percent by weight Si-bonded hydroxyl groups are mixed with 1 g of ÄPS and 1 g of n-hexylamine.

The resulting masses are ideally suited as coatings Wood; they cure in air in 24 hours at room temperature.

Example 20 1 g of n-hexylamine is mixed with 40 g of a 50 weight percent Xylene solution of an organopolysiloxane copolymers of 35 mol percent phenylmethylsiloxane, 10 mole percent dimethylsiloxane, 25 mole percent monomethylsiloxane and 30 mole percent Monophenylsiloxane units containing 3 percent by weight of Si-bonded hydroxyl groups and 4 percent by weight Si-bonded ethoxyl groups, mixed.

The resulting mass hardens as a coating on a cedar wood panel in 24 hours at room temperature in air to a tack-free gel.

Claims (1)

Claim: Method for producing shaped structures Organopolysiloxane molding compounds with organosilicon compounds, the Si-bonded hydroxyl groups and SiOC-bonded, monovalent, optionally substituted hydrocarbon radicals or hydrocarbon ether residues, as well as possibly further additives, by hardening with at least 0.01 percent by weight ammonia, hydrazine or basic Amino compounds which have a basic dissociation constant at 25 ° C. in dilute aqueous solution between 10-1 and 10-l, characterized in that the organopolysiloxanes used on average 0.9 to 1.9 Si-bonded monovalent, optionally per Si atom have substituted hydrocarbon radicals or hydrocarbon ether radicals, being in the organosilicon compounds that are not covered by the above radicals or groups of saturated valences are saturated by siloxane oxygen atoms. Publications considered: German Patent No. 949 604; Belgian Patent No. 561 726; French patent specification No. 1 032 011, 1,093,400; U.S. Patent Nos. 2,518,160, 2,833,742.