Aqueous two-component organoalkoxysilane composition

Abstract

The present invention relates to aqueous two-component adhesion promoter compositions and also to their use in methods of adhesive bonding or sealing. Additionally it relates to packaging consisting of the two-component composition and also a pack having two chambers. The two-component adhesion promoter composition is composed of a first component K 1 comprising at least one organoalkoxysilane S and at least one anhydrous surfactant T; and of a second component K 2 comprising at least water and at least one acid, the acid being present in an amount such that, after components K 1 and K 2 have been mixed, the resulting mixture is acidic.

1 . Aqueous two-component adhesion promoter composition composed of 
 a first component K 1  comprising 
 at least one organoalkoxysilane S and  
 at least one anhydrous surfactant T;  
   and of a second component K 2  comprising 
 at least water and  
 at least one acid;  
   and the acid being present in an amount such that after components K 1  and K 2  have been mixed the resulting mixture gives an acidic reaction.    
   
   
       2 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the acid is an organic acid, in particular a sulphonic acid or carboxylic acid, especially acetic acid or formic acid.  
   
   
       3 . Aqueous two-component adhesion promoter composition according to  claim 2 , characterized in that the acid is preferably an aromatic sulphonic acid, especially p-toluenesulphonic acid or dodecylbenzylsulphonic acid.  
   
   
       4 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the acid is an inorganic acid, especially an acid having a sulphur atom or phosphorus atom.  
   
   
       5 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the acid is present in an amount such that, after components K 1  or K 2  have been mixed, the resulting mixture has a pH of between 3 and 5.  
   
   
       6 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the organoalkoxysilane S is an aminosilane.  
   
   
       7 . Aqueous two-component adhesion promoter composition according to  claim 6 , characterized in that the aminosilane is an aminosilane of the formula (I) or a reaction product of an aminosilane of the formula (I) with a compound containing at least one functional group which reacts with primary or secondary amino groups  
     
       
         
         
             
             
         
       
       where R 1  is an alkyl group having 1 to 8 C atoms, preferably a methyl group or an ethyl group, in particular a methyl group;  
       R 2  is an alkyl group having 1 to 5 C atoms, preferably a methyl group or an ethyl group or an isopropyl group, in particular a methyl group or an ethyl group,  
       R 3  is a linear or branched alkylene group having 1 to 4 C atoms, in particular a propylene group,  
       R 4  is H or a linear or branched alkylene group having 1 to 10 C atoms or is a substitutent of the formula (II)  
       
         
           
           
               
               
           
         
       
       R 5  is H or a linear or branched alkylene group having 1 to 10 C atoms or a linear or branched alkylene group having 1 to 10 C atoms with further heteroatoms, or is a substitutent of the formula (II)  
       
         
           
           
               
               
           
         
       
       and a is the value 0, 1 or 2, in particular 0 or 1, preferably 0.  
     
   
   
       8 . Aqueous two-component adhesion promoter composition according to  claim 7 , characterized in that aminosilane is selected from the group comprising aminosilanes of the formula (III), (IV) and (V)  
     
       
         
         
             
             
         
       
     
   
   
       9 . Aqueous two-component adhesion promoter composition according to  claim 7 , characterized in that the aminosilane is a reaction product of an aminosilane of the formula (III) or (IV) as described in  claim 8  with a compound containing epoxy groups.  
   
   
       10 . Aqueous two-component adhesion promoter composition according to  claim 9 , characterized in that the compound containing epoxy groups is an epoxysilane, in particular an epoxysilane of the formula (VI)  
     
       
         
         
             
             
         
       
     
   
   
       11 . Aqueous two-component adhesion promoter composition according to  claim 7 , characterized in that a=0 and R 2  is methyl and R 5  is propylene.  
   
   
       12 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that organoalkoxysilane S is an organoalkoxysilane of the formula (XIV)  
     
       
         
         
             
             
         
       
       where R 1′  is an alkyl group having 1 to 8 C atoms, preferably a methyl group or an ethyl group, in particular a methyl group;  
       R 6′  is an alkyl group having 1 to 5 C atoms, preferably a methyl group or an ethyl group or an isopropyl group, in particular a methyl group or an ethyl group,  
       R 3′  is a linear or branched alkyl chain having 1 to 20 C atoms which is optionally substituted by an epoxy, or vinyl or (meth)acrylate group;  
       and a is the value 0, 1 or 2, in particular 0 or 1, preferably 0.  
     
   
   
       13 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the weight fraction of organoalkoxysilane S is ≧40% by weight, based on the weight of component K 1 .  
   
   
       14 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the weight ratio of organoalkoxysilane S to anhydrous surfactant T(S:T) has a value of 20:1 to 1:2, in particular 5:1 to 1:2, preferably 3:1 to 2:3.  
   
   
       15 . Aqueous two-component adhesion promoter composition according to  claim 1 , characterized in that the weight fraction of water is ≧60% by weight, based on the weight of component K 2 .  
   
   
       16 . Packaging ( 6 ) consisting of 
 a pack ( 5 ) which has two chambers ( 1 ,  2 ) separated from one another by at least one dividing wall ( 3 );    and    an aqueous two-component adhesion promoter composition according to  claim 1 ,    the first component K 1  being present in the first chamber ( 1 ) and the second component K 2  being present in the second chamber ( 2 ).    
   
   
       17 . Packaging ( 6 ) according to  claim 16 , characterized in that the dividing wall ( 3 ) is manufactured from a material which ruptures or tears as a result of the application of pressure.  
   
   
       18 . Aqueous composition obtained by mixing components K 1  and K 2  of an aqueous two-component adhesion promoter composition according to  claim 1 .  
   
   
       19 . Use of an aqueous two-component adhesion promoter composition according to or of an aqueous composition according to  claim 18  as a pre-treatment agent for improving the adhesion of an adhesive or sealant applied thereto.  
   
   
       20 . Method of substrate surface pre-treatment, comprising the steps of 
 a) mixing components K 1  and K 2  of a two-component adhesion promoter composition according to  claim 1     b) applying the resulting mixture to a substrate surface.    
   
   
       21 . Method of adhesive bonding or of sealing, comprising the steps of 
 i) mixing components K 1  and K 2  of a two-component adhesion promoter composition according to  claim 1     ii) applying the resulting mixture to a substrate S 1  to be bonded or sealed    iii) applying adhesive or sealant to the flashed-off aqueous adhesion promoter composition located on the substrate S 1     iv) contacting the adhesive or sealant with a second substrate S 2 ;    or    i′) mixing components K 1  and K 2  of a two-component adhesion promoter composition according to  claim 1     ii′) applying the resulting mixture to a substrate S 1  to be bonded or sealed    iii′) applying adhesive or sealant to the surface of a second substrate S 2     iv′) contacting the adhesive or sealant with the flashed-off aqueous adhesion promoter composition located on the substrate S 1 ;    or    i″) mixing components K 1  and K 2  of a two-component adhesion promoter composition according to  claim 1     ii″) applying the resulting mixture to a substrate S 1  to be bonded or sealed    iii″) flashing off the two-component adhesion promoter composition    iv″) applying adhesive or sealant between the surfaces of the substrates S 1  and S 2 ,    the second substrate S 2  consisting of the same material as or different material from the substrate S 1 .    
   
   
       22 . Method according to  claim 21 , characterized in that step iv) or iv′) or iv″) is followed by a step v) of curing of the adhesive or sealant.  
   
   
       23 . Method according to  claim 21 , characterized in that the adhesive is a moisture-curing one-component polyurethane adhesive.  
   
   
       24 . Adhesively bonded or sealed article obtained by a method according to  claim 21 .  
   
   
       25 . Adhesively bonded or sealed article according to  claim 24 , characterized in that the article is a means of transport, in particular a car, or a component for mounting on a means of transport, in particular a car.