Composite comprising heat-resistant fiber and siloxane polymer

Abstract

The present invention provides a fiber-reinforced glass having excellent heat resistance and toughness, or a composite comprising a heat-resistant fiber and a siloxane polymer, which has a modified surface structure and is useful as a heat-resistant fiber.

1 . A composite comprising a heat-resistant fiber and a siloxane polymer.  
     
     
         2 . The composite according to  claim 1 , wherein the siloxane polymer is a crosslinked siloxane polymer obtainable by polycondensing a siloxane compound mainly of the following formula (1):  
       
         
           
           
               
               
           
         
       
       (wherein n represents an integer of 2 to 10; R 1 , R 2 , R 3  and R 4  may be each the same or different, and represent a hydrogen atom or an alkyl group of 1 to 4 carbon atoms; and R 2  and R 4  may be each the same or different every repetition unit).  
     
     
         3 . The composite according to  claim 1 , wherein the heat-resistant fiber is one or more kinds of fibers selected from the group consisting of a wholly aromatic polyamide fiber, a wholly aromatic polyester fiber, a polyparaphenylene benzobisoxazole fiber, a fluorine fiber, a carbon fiber, a glass fiber and a quartz fiber.  
     
     
         4 . The composite according to  claim 1 , wherein the heat-resistant fiber is a polyparaphenylene terephthalamide fiber.  
     
     
         5 - 6 . (canceled)  
     
     
         7 . A fiber-reinforced glass comprising a heat-resistant fiber and a siloxane polymer as a constituent component.  
     
     
         8 . A heat-resistant fiber covered with a siloxane polymer.  
     
     
         9 . The heat-resistant fiber according to  claim 8 , wherein the heat-resistant fiber covered with a siloxane polymer has a tape-like yarn form.  
     
     
         10 . An aramid fiber covered with a siloxane polymer, characterized in that an aramid fiber containing moisture at an equilibrium moisture content or larger is impregnated or coated with a coating solution in which a compound represented by the formula (1), and an organic compound which is hydrolyzable and whose hydrolysate contains a metal serving as a catalyst for curing the compound are dissolved in a substantially anhydrous solvent, and the organic solvent is removed and, at the same time, the compound is cured utilizing the moisture in the aramid fiber as reaction water,  
       
         
           
           
               
               
           
         
       
       (wherein n represents an integer of 2 to 10; R 1 , R 2 , R 3  and R 4  may be each the same or different, and represent a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, and R 2  and R 4  may be each the same or different every repetition unit).  
     
     
         11 . The composite according to  claim 2 , wherein the heat-resistant fiber is one or more kinds of fibers selected from the group consisting of a wholly aromatic polyamide fiber, a wholly aromatic polyester fiber, a polyparaphenylene benzobisoxazole fiber, a fluorine fiber, a carbon fiber, a glass fiber and a quartz fiber.  
     
     
         12 . The composite according to  claim 2 , wherein the heat-resistant fiber is a polyparaphenylene terephthalamide fiber.