Reaction Resin Mortar Curable by Frontal Polymerization and Method for Fixing Anchor Rods

Abstract

A reaction resin mortar curable by frontal polymerization contains at least one radically polymerizable compound, at least one thiol-functionalized compound and at least one polymerization initiator, wherein the weight ratio of the at least one radically polymerizable compound and the at least one thiol-functionalized compound is in the range of 10:1 to 2:1 and wherein the polymerization initiator is selected from compounds which can be thermally activated and/or thermally released at a temperature of above 30° C. and/or ammonium persulfates which are formed in-situ from at least one organically substituted ammonium salt and at least one inorganic persulfate.

1 - 13 . (canceled) 
     
     
         14 : A method for fixing anchor rods, or rebars in bore holes of different subgrades, said method comprising:
 introducing a reaction resin mortar into the bore hole,   inserting the anchor rod, or the rebar into the bore hole, and   triggering the frontal polymerization by heating the reaction resin mortar to a temperature above the reaction temperature of the polymerization initiator or of the polymerization accelerator,   wherein the reaction resin mortar is curable by frontal polymerization and comprises   (a) at least one radically polymerizable compound.   (b) at least one thiol-functionalized compound, and   (c) at least one polymerization initiator,   wherein a weight ratio of the at least one radically polymerizable compound (a) and the least one thiol-functionalized compound (b) is in the range of 10:1 to 2:1, and   wherein the polymerization initiator (c) is selected from compounds which can be thermally released at a temperature of 30° C. and/or ammonium persulfates which are formed in-situ from at least one organically substituted ammonium salt and at least one inorganic persulfate.   
     
     
         15 : The method according to  claim 14 , which is suitable for fixing anchor rods, or rebars in hollow subgrades. 
     
     
         16 : The method according to  claim 14 , wherein the polymerization of the reaction resin mortar is triggered by selective or extensive heating of the surface layer or in the inside the mortar mass. 
     
     
         17 : The method according to  claim 14 , wherein the polymerization of the reaction resin mortar is triggered by the supply of heat via the anchor rod or rebar. 
     
     
         18 : The method according to  claim 16 , wherein the selective or extensive heating takes place with the aid of a flame, a soldering tip, a heating wire, a hot air fan, an induction oven, a flash of light, a laser beam and/or in-situ by a chemical reaction. 
     
     
         19 . The method according to  claim 14 , wherein the reaction resin mortar comprises 10 to 98 wt % of a mixture of the at least one radically polymerizable compound (a) and the at least one thiol-functionalized compound (b). 
     
     
         20 . The method according to  claim 14 , wherein the reaction resin mortar comprises 2 to 30 wt % of the polymerization initiator (c). 
     
     
         21 . The method according to  claim 14 , wherein the reaction resin mortar comprises an ammonium persulfate as the polymerization initiator (c), wherein the at least one organically substituted ammonium salt and the at least one organic persulfate are present separately in a reaction inhibiting manner such that the organically substituted ammonium persulfate is formed only after the mixing thereof. 
     
     
         22 . The method according to  claim 21 , wherein the reaction resin mortar comprises, as an organically substituted ammonium salt, a tri or tetra alkyl, aryl or aryl-alkyl ammonium halide, acetate, (hydrogen)carbonate, (hydrogen)phosphate, (hydrogen)sulfate, (meth)acrylate or mixtures of these compounds. 
     
     
         23 . The method according to  claim 21 , wherein the reaction resin mortar comprises, as an inorganic persulfate, ammonium, potassium or sodium persulfate or mixtures of these compounds. 
     
     
         24 . The method according to  claim 14 , wherein the reaction resin mortar comprises, as the polymerization initiator (c), a peroxide and/or an azo compound, which, optionally in the presence of a polymerization accelerator (d), each have a half-life period t½ in the range between 1 and 200 minutes at a temperature of 100° C. in chlorobenzene. 
     
     
         25 . The method according to  claim 14 , wherein the reaction resin mortar further comprises a polymerization accelerator (d). 
     
     
         26 . The method according to  claim 14 , wherein the reaction resin mortar further comprises inorganic and/or organic aggregates. 
     
     
         27 . The method according to  claim 26 , wherein the aggregate is selected from fillers and/or additives. 
     
     
         28 . The method according to  claim 27 , wherein the aggregate is contained in the reaction resin mortar in a quantity of up to 60 wt %. 
     
     
         29 . The method according to  claim 25 , wherein the polymerization accelerator (d) is selected from amines, sulfides, thiourea or mercaptans and/or metal compounds. 
     
     
         30 . The method according to  claim 25 , wherein the polymerization accelerator (d) is contained in the reaction resin mortar in a quantity of 0.01 to 1 wt %. 
     
     
         31 . The method according to  claim 14 , wherein the at least one thiol-functionalized compound (b) contains at least two thiol groups.