Method of producing polyether rubber
A method of production of a polyether rubber containing unit expressed by the following general formula (1) in 0.1 mol % or more and less than 30 mol % obtained by reacting a polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more and a nitrogen atom-containing aromatic heterocyclic compound by kneading in the presence of an acid acceptor containing at least a hydrotalcite having a nitrogen adsorption specific surface area as measured by a BET method of 10 m 2 /g or more is provided. wherein, in the above general formula (1), A + is a group containing a cationic nitrogen-containing aromatic heterocyclic ring, and is bonded with a carbon atom at the “2” position shown in the above general formula (1) through a nitrogen atom constituting the cationic nitrogen-containing aromatic heterocyclic ring, and X − is any counter anion.
1. A method of production of a polyether rubber containing unit expressed by the following general formula (1) in 0.1 mol % or more and less than 30 mol % comprising:
reacting a polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more and a nitrogen atom-containing aromatic heterocyclic compound by kneading in the presence of an acid acceptor containing at least a hydrotalcite having a nitrogen adsorption specific surface area as measured by a BET method of 14 m 2 /g or more so as to substitute at least part of halogen atom constituting the epihalohydrin monomer unit with a group containing a cationic nitrogen-containing aromatic heterocyclic ring:
wherein, in the above general formula (1), A + is a group containing a cationic nitrogen-containing aromatic heterocyclic ring, where the group containing a cationic nitrogen-containing aromatic heterocyclic ring is bonded with a carbon atom at the “2” position shown in the above general formula (1) through a nitrogen atom constituting the cationic nitrogen-containing aromatic heterocyclic ring, and X − is any counter anion.
2. The method of production of a polyether rubber according to claim 1 , wherein an amount of the hydrotalcite to be used is 0.1 to 15 parts by weight with respect to 100 parts by weight of the polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more.
3. The method of production of a polyether rubber according to claim 1 , wherein the hydrotalcite contains at least Mg and Al.
4. The method of production of a polyether rubber according to claim 1 , wherein the nitrogen atom-containing aromatic heterocyclic compound is a five-membered heterocyclic compound or a six-membered heterocyclic compound.
5. The method of production of a polyether rubber according to claim 1 , wherein, further, an oxide, hydroxide, and/or carbonate of at least one of magnesium, calcium, and barium are used as the acid acceptor in a proportion of 0.1 to 5 parts by weight with respect to 100 parts by weight of the polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more.
6. The method of production of a polyether rubber according to claim 1 , wherein, further, magnesium oxide is used as the acid acceptor in a proportion of 0.1 to 2 parts by weight with respect to 100 parts by weight of the polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more.