Method for coating textile materials

Abstract

The invention relates to a method for coating a textile material, said method comprising the following steps: a) at least one cycle of impregnating the textile material with a sol-gel adhesion formulation, said sol-gel adhesion formulation being free of polycarboxylic acid; b) at least one cycle of drying the impregnated textile material obtained in step a); c) at least one cycle of impregnating the dried textile material obtained in step b) with an omniphobic or hydrophobic sol-gel formulation comprising sulphamic acid, said omniphobic or hydrophobic sol-gel formulation being different from the sol-gel adhesion formulation; d) at least one cycle of drying the impregnated textile material obtained in step c).

1 - 29 . (canceled) 
     
     
         30 . A process for coating a textile material, said process comprising the following steps:
 a) at least one cycle of impregnating the textile material with a sol-gel bonding formulation, said sol-gel bonding formulation being free of polycarboxylic acid;   b) at least one cycle of drying the impregnated textile material obtained in step a);   c) at least one cycle of impregnating the dried textile material obtained in step b) with an omniphobic or hydrophobic sol-gel formulation comprising sulfamic acid, said omniphobic or hydrophobic sol-gel formulation being different from the sol-gel bonding formulation;   d) at least one cycle of drying the impregnated textile material obtained in step c).   
     
     
         31 . The process as claimed in  claim 30 , wherein at least one drying cycle is followed by a step d′) of maturing the material obtained in step d) by storage at room temperature under a humid atmosphere with a relative humidity of 50% for at least 16H to 18H. 
     
     
         32 . The process as claimed in  claim 30 , comprising the following additional steps:
 e) washing the impregnated textile material obtained in step d) with a neutralizing aqueous solution.   f) drying the material obtained in step e).   
     
     
         33 . The process as claimed in  claim 32 , wherein the step of drying the material obtained in step e) is followed by a step f′) of maturing the material obtained in step f) by storage at room temperature under a humid atmosphere with a relative humidity of 50% for at least 16H to 18H. 
     
     
         34 . The process as claimed in  claim 30 , wherein each of the impregnation steps is independently performed by padding or spraying. 
     
     
         35 . The process as claimed in  claim 30 , comprising at least two successive cycles, a) and b), of impregnating the textile material with a sol-gel bonding formulation, said sol-gel bonding formulation being free of polycarboxylic acid, and of drying the impregnated textile material. 
     
     
         36 . The process as claimed in  claim 30 , wherein step a) comprises a squeezing step under pressure after the or each impregnation cycle and/or step c) comprises a squeezing step under pressure after the or each impregnation cycle. 
     
     
         37 . The process as claimed in  claim 30 , wherein the sol-gel bonding formulation comprises at least two silylated precursors. 
     
     
         38 . The process as claimed  claim 30 , wherein the sol-gel bonding formulation comprises an acid chosen from sulfamic acid, hydrochloric acid, sulfuric acid, nitric acid and para-toluenesulfonic acid. 
     
     
         39 . The process as claimed in  claim 30 , wherein the sol-gel bonding formulation is free of zirconium alkoxide and/or sodium hypophosphite. 
     
     
         40 . The process as claimed in  claim 30 , wherein the omniphobic sol-gel formulation comprises at least one silylated precursor, chosen from 1H,1H,2H,2H-perfluorodecyltriethoxysilane (17FTEOS), 1H,1H,2H,2H-perfluorooctyltriethoxysilane (13FTEOS), 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (13FTMOS), 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (17FTMOS), or a mixture of one or more of these precursors with tetraethoxysilane (TEOS). 
     
     
         41 . The process as claimed in  claim 30 , wherein the hydrophobic sol-gel formulation comprises at least one silylated precursor chosen from hexadecyltriethoxysilane (HDTEOS), n-octadecyltriethoxysilane (ODTEOS), n-decyltriethoxysilane (DTEOS) and dodecyltriethoxysilane (DDTEOS), or a mixture of one or more of these precursors with tetraethoxysilane (TEOS). 
     
     
         42 . The process as claimed in  claim 30 , wherein the sol-gel bonding, omniphobic and/or hydrophobic formulation is an aqueous formulation and optionally comprises one or more C1 to C4 aliphatic alcohols. 
     
     
         43 . A sol-gel bonding formulation comprising at least two silylated precursors, a first precursor being chosen from tetramethoxysilane (TMOS), tetraethoxysilane (TEOS), and a second precursor chosen from (3-glycidyloxypropyl)trimethoxysilane (GPTMOS), (3-glycidyloxypropyl)triethoxysilane (GPTEOS) and aminopropyltriethoxysilane,
 optionally, the combination of TMOS/GPTMOS precursors being excluded,   and comprising an acid chosen from sulfamic acid, hydrochloric acid, sulfuric acid, nitric acid and para-toluenesulfonic acid, said sol-gel formulation being free of polycarboxylic acid.   
     
     
         44 . An omniphobic sol-gel formulation comprising at least one silylated precursor chosen from 1H,1H,2H,2H-perfluorodecyltriethoxysilane (17FTEOS), 1H,H,H,H-perfluorooctyltriethoxysilane (13FTEOS), 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (13FTMOS) and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (17FTMOS), or a mixture of one or more of these precursors with tetraethoxysilane (TEOS), and comprising sulfamic acid. 
     
     
         45 . \A hydrophobic sol-gel formulation comprising at least one silylated precursor chosen from hexadecyltriethoxysilane (HDTEOS), n-octadecyltriethoxysilane (ODTEOS), n-decyltriethoxysilane (DTEOS) and dodecyltriethoxysilane (DDTEOS), or a mixture of one or more of these precursors with tetraethoxysilane (TEOS), and comprising sulfamic acid. 
     
     
         46 . An impregnated textile material comprising at least a first bonding layer obtained by application of a sol-gel bonding formulation as claimed in  claim 43  and at least a second omniphobic or hydrophobic layer over the bonding layer. 
     
     
         47 . An impregnated textile material obtained via the coating process as claimed in  claim 30 . 
     
     
         48 . A personal protective equipment comprising the impregnated textile material as claimed in  claim 46 .