High performance silicon based coatings

Abstract

Provided herein is a method of coating a surface. A silicon-based coating composition is coated onto a surface. The silicon-based coating composition comprises polysilazane and polysilane comprising a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and are chosen from alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl, which polysilane has a weight average molecular weight of more than 50,000. Also provided are silicon-based coating compositions and cured coatings from those compositions using the provided method.

1 - 39 . (canceled) 
     
     
         40 . A silicon-based coating composition comprising:
 polysilazane;   polysiloxane; and   polysilane comprising a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1  and R 2  are the same or different and are chosen from alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl.   
     
     
         41 . The composition of  claim 40 , wherein the polysilazane has the formula (CH 3 ) 3 Si—NH—[(CH 3 ) 2 Si—NH] n —Si(CH 3 ) 3 , wherein n is greater than 1. 
     
     
         42 . The composition of  claim 40 , comprising about 5% (w/w of the total composition) to about 80% (w/w of the total composition) polysilazane. 
     
     
         43 . The composition of  claim 42 , comprising 15% (w/w of the total composition) to 20% (w/w of the total composition) polysilazane. 
     
     
         44 . The composition of  claim 40 , wherein the polysiloxane has the formula [SiOR 1 R 2 ] n , wherein n is greater than 1, and each R 1  and R 2  is methyl. 
     
     
         45 . The composition of  claim 40 , comprising about 20% (w/w of the total composition) to about 60% (w/w of the total composition) polysiloxane. 
     
     
         46 . The composition of  claim 45 , comprising 25% (w/w of the total composition) to 30% (w/w of the total composition) polysiloxane. 
     
     
         47 . The composition of  claim 40 , wherein the polysilane comprises the formula [R 1 R 2 Si—R 1 R 2 Si] n , wherein n is greater than 1, and each R 1  and R 2  is methyl. 
     
     
         48 . The composition of  claim 40 , comprising about 1% polysilane. 
     
     
         49 . The composition of  claim 40 , further comprising 15% (w/w of the total composition) to 60% (w/w of the total composition) organic solvent. 
     
     
         50 . The composition of  claim 49 , comprising about 55% (w/w of the total composition) to about 60% (w/w of the total composition) organic solvent. 
     
     
         51 . The composition of  claim 40 , further comprising an organic solvent chosen from tert-butyl acetate, isopropyl acetate, methyl acetate, aliphatic hydrocarbon, and mixtures thereof. 
     
     
         52 . The composition of  claim 40 , comprising about 1% (w/w of the total composition) to about 5% (w/w of the total composition) polysilazane. 
     
     
         53 . The composition of  claim 40 , comprising between 0% (w/w of the total composition) and 1% (w/w of the total composition) polysiloxane. 
     
     
         54 . The composition of  claim 40 , comprising about 1% (w/w of the total composition) to about 5% (w/w of the total composition) polysilane. 
     
     
         55 . The composition of  claim 40 , comprising about 1% (w/w of the total composition) to about 5% (w/w of the total composition) polysilazane; between 0% (w/w of the total composition) and 1% (w/w of the total composition) polysiloxane; and about 1% (w/w of the total composition) to about 5% (w/w of the total composition) polysilane. 
     
     
         56 . A method of coating a surface, which method comprises:
 a. coating onto a surface the silicon-based coating composition of  claim 40 ; and   b. curing the coating ambiently to provide a non-ceramic clear coating.   
     
     
         57 . The method of  claim 56 , wherein the coating step comprises wiping the coating composition onto the surface as a uniform wet film. 
     
     
         58 . The method of  claim 56 , wherein the curing step occurs for at least 15 minutes at room temperature. 
     
     
         59 . The method of  claim 56 , further comprising pre-conditioning the surface to be a clean surface before the coating step. 
     
     
         60 . The method of  claim 56 , wherein the surface is porous and comprises a material chosen from an epoxy resin, a composite material, and mixtures thereof. 
     
     
         61 . The method of  claim 60 , wherein the surface comprises an epoxy resin which comprises an amine hardener. 
     
     
         62 . A cured coating formed from the method of  claim 56 . 
     
     
         63 . The cured coating of  claim 62 , having a thickness ranging between 0.1 mil and 1.5 mil. 
     
     
         64 . The cured coating of  claim 62 , having a hardness ranging between 2H and 9H in accordance with ASTM 3363 for film hardness by pencil test. 
     
     
         65 . The cured coating of  claim 62 , having cured coating has a kinetic coefficient of friction between 0.03 and 0.04. 
     
     
         66 . A method of coating a surface, which method comprises:
 a. coating onto a surface the silicon-based coating composition of  claim 40 ; and   b. curing the coating ambiently to provide a non-ceramic clear coating.   
     
     
         67 . A cured coating formed from the method of  claim 56 .