Method for the production of insulation plates and binding agent mixture for same

Abstract

A method for the production of insulation plates from an aqueous pulp comprised of mineral fillers, cellulose-containing products and a binding agent based on a novolak wherein a pulp is used comprising an additive substance selected from the group consisting of fatty acid amides or substituted fatty acid amides, the plates obtained after curing are used, inter alia, as mold covering plates or as so-called tundish plates for application in continuous casting processes.

What I claim is:  
     
         1 . A resin mixture formed by pulverizing a solidified melt of a novolak and at least one additive selected from the group consisting of fatty acid amides and substituted fatty acid amides.  
     
     
         2 . A resin mixture of  claim 1  wherein the amount of the additive is 1 to 10% by weight based on the novolak.  
     
     
         3 . A resin mixture of  claim 1  wherein the additive is selected from the group consisting of oleamide, behenamide, stearamide, and bisstearamide.  
     
     
         4 . A resin mixture of  claim 2  wherein the additive is bisstearamide.  
     
     
         5 . A resin mixture of  claim 1  also containing a curing agent.  
     
     
         6 . A resin mixture of  claim 5  wherein the curing agent is hexamethylene tetramine.  
     
     
         7 . A resin mixture of  claim 1  wherein the additive has the formula  
       
         
           
           
               
               
           
         
       
       wherein R is alkyl of 10 to 30 carbon atoms, R′ and R″ are individually hydrogen or alkyl of 1 to 6 carbon atoms and n is an integer from 1 to 6.  
     
     
         8 . A resin mixture of  claim 1  also containing filler.  
     
     
         9 . A process for the production of insulation plates comprising forming an aqueous pulp comprised of cellulose containing products, mineral fillers and a novolak binding agent, probing the aqueous pump onto a fine-mesh screen, extracting the water from the pulp under vacuum to obtain a “green” filter cake plate and curing the plate at a temperature of at least 120° C., the improvement comprising adding to the pulp at least one additive selected from the group consisting of fatty acid amides and substituted fatty acid amides.  
     
     
         10 . The process of  claim 9  wherein the resin mixture of  claim 1  is used.  
     
     
         11 . The process of  claim 9  wherein the additive has the formula  
       
         
           
           
               
               
           
         
       
       wherein R is alkyl of 10 to 30 carbon atoms, R′ and R″ are individually hydrogen or alkyl of 1 to 6 carbon atoms and n is an integer from 1 to 6.  
     
     
         12 . The process of  claim 9  wherein the additive is selected from the group consisting of oleamide, behenamide, stearamide, and bisstearamide.  
     
     
         13 . The process of  claim 9  wherein the additive is bisstearamide.  
     
     
         14 . The process of  claim 9  wherein the novolak has an average molecular weight of 500 to 800.  
     
     
         15 . The process of  claim 9  wherein the novolak has an average molecular weight of 600 to 750.  
     
     
         16 . An insulation plate formed by the process of  claim 9.