Modifying agent, polyamide copolymer synthesized using modifying agent and method for preparing polyamide copolymer
The invention provides a modifying agent, for synthesizing a polyamine copolymer, being a amide- group-containing diamine which is a reaction product of an aliphatic diamine and a first carboxylate, or a salt formed by reacting the amide- group-containing diamine with a second carboxylic acid, wherein the amide- group-containing diamine is represented by the general formula (I) where y represents an integer within 2˜6 (2 ≤y≤6) and x represents an integer within 4˜18 (4≤x≤18); the first carboxylate is an ester formed from an aliphatic carboxylic acid and the second carboxylic acid is a carboxylic acid.
1 . A modifying agent, for synthesizing a polyamine copolymer, being a amide- group-containing diamine which is a reaction product of an aliphatic diamine and a first carboxylate, or a salt formed by reacting the amide- group-containing diamine with a second carboxylic acid, wherein the amide- group-containing diamine is represented by the following general formula (I):
where y represents an integer within 2˜6 (2≤y≤6) and x represents an integer within 4˜18 (4≤x≤18);
the first carboxylate is an ester formed from an aliphatic carboxylic acid and the second carboxylic acid is a carboxylic acid.
2 . The modifying agent as claimed in claim 1 , wherein y is 2 and x is an integer within 4˜18.
3 . The modifying agent as claimed in claim 1 , wherein the amide- group-containing diamine has a boiling point higher than 180° C.
4 . The modifying agent as claimed in claim 1 , being a diamine dicarboxylate salt which is a reaction product of the amide- group-containing diamine and the second carboxylic acid selected from the group consisting of the following or the combination thereof: isophthalic acid, terephthalic acid and adipic acid.
5 . The modifying agent as claimed in claim 1 , wherein the polyamide copolymer synthesized by reacting the modifying agent and caprolactam has a moisture regain more than 5% at 20° C. and 65% RH.
6 . The modifying agent as claimed in claim 1 , wherein the aliphatic diamine is ethylene diamine and the first carboxylate is one ester selected from the group consisting of the following or the combination thereof: succinate, adipate, suberate, sebacate, and dodecanedioate.
7 . A polyamide copolymer, being synthesized by reacting a modifying agent with caprolactam, wherein the polyamide copolymer has a lower melting temperature than polycaprolactam homopolymer; and
the modifying agent is an amide- group-containing diamine which is a reaction product of an aliphatic diamine and a first carboxylate, or a salt formed by reacting the amide- group-containing diamine with a second carboxylic acid, wherein the amide- group-containing diamine is represented by the following general formula (I):
where y represents an integer within 2˜6 (2≤y≤6) and x represents an integer within 4˜18 (4≤x≤18);
the first carboxylate is an ester formed from an aliphatic carboxylic acid and the second carboxylic acid is a carboxylic acid.
8 . The polyamide copolymer as claimed in claim 7 , wherein the modifying agent is a diamine dicarboxylate salt which is a reaction product of the amide- group-containing diamine and the second carboxylic acid selected from the group consisting of the following or the combination thereof: isophthalic acid, terephthalic acid and adipic acid.
9 . The polyamide copolymer as claimed in claim 7 , wherein y is 2 and x is an integer within 4˜18.
10 . The polyamide copolymer as claimed in claim 7 , wherein the aliphatic diamine is ethylene diamine and the first carboxylate is one ester selected from the group consisting of the following or the combination thereof: succinate, adipate, suberate, sebacate, and dodecanedioate.
11 . The polyamide copolymer as claimed in claim 7 , wherein the polyamide copolymer has a moisture regain more than 5% at 20° C. and 65% RH.
12 . A method for preparing a polyamide copolymer, comprising the following steps:
a step of providing a modifying agent, being a amide- group-containing diamine which is a reaction product of an aliphatic diamine and a first carboxylate, or a salt formed by reacting the amide- group-containing diamine with a second carboxylic acid; and
a step of copolymerizing the modifying agent with caprolactam;
wherein the amide- group-containing diamine is represented by the following general formula (I):
where y represents an integer within 2˜6 (2≤y≤6) and x represents an integer within 4˜18 (4≤x≤18);
the first carboxylate is an ester formed from an aliphatic carboxylic acid and the second carboxylic acid is a carboxylic acid.
13 . The method as claimed in claim 12 , wherein the step of copolymerizing is conducted under an atmospheric pressure of 1 atm.
14 . The method as claimed in claim 12 , wherein the second carboxylic acid is selected from the group consisting of the following or the combination thereof:
isophthalic acid, terephthalic acid and adipic acid.
15 . The method as claimed in claim 12 , wherein y is 2 and x is an integer within 4˜18.
16 . The method as claimed in claim 12 , wherein the aliphatic diamine is ethylene diamine and the first carboxylate is one ester selected from the group consisting of the following or the combination thereof: succinate, adipate, suberate, sebacate, and dodecanedioate.