Flexible hydrophilic aspartic resin and emulsion
Disclosed are a flexible hydrophilic aspartic resin and an emulsion, which relate to the technical field of aspartate resins. The present application introduces hydrophilic segments and flexible segments into the structure of aspartic resin, thereby obtaining aspartic resin possessing both flexibility and hydrophilicity. The flexible hydrophilic aspartic resin can be self-emulsified and dispersed in water to form an emulsion.
1 . A flexible hydrophilic aspartic resin, comprising a —N(X)CONH— group, a first polyether segment, a second polyether segment, and at least one of structures as shown in formula (1) or structures as shown in formula (2):
—NHCOO— group (1)
—OOC(N—)CONH— group (2)
wherein X is selected from H or a residue remaining after removing one hydrogen atom from an amino group of an amino resin containing the amino group, the amino group being a secondary amino group;
a molar content of a polyethylene glycol segment in the first polyether segment is not less than 80%, wherein the first polyether segment is directly chemically bonded to at least one of the —NHCOO— group or the —OOC(N—)CONH— group;
a molar content of a polyethylene glycol segment in the second polyether segment is not higher than 20%, wherein the second polyether segment is directly chemically bonded to at least one of the —NHCOO— group or the —OOC(N—)CONH— group;
a structure of the first polyether segment is as shown in formula (3):
—(CH 2 CH 2 O) a D b E (3),
wherein D is at least one selected from a group consisting of: —CH 2 CH 2 CH 2 O—, —CH 2 CH 3 CHO—, —(CH 2 ) 4 O—, —CH 2 CH 2 CH 3 CHO—, and —(CH 2 ) 6 O—, 4≤a≤50, b≥0, a/(a+b)≥0.8, and E is selected from C 1 -C 4 alkyl group;
a structure of the second polyether segment is as shown in formula (4):
—(CH 2 CH 2 O) c T d - (4),
wherein T is at least one selected from a group consisting of: —CH 2 CH 2 CH 2 O—, —CH 2 CH 3 CHO—, —(CH 2 ) 4 O—, —CH 2 CH 2 CH 3 CHO—, —(CH 2 ) 6 O—, and a divalent residue remaining after removing two active hydrogens from a polyester diol, c≥0, 4≤d≤50, and c/(c+d)≤0.2;
or, the flexible hydrophilic aspartic resin comprises the —N(X)CONH— group, a cation-containing structure, and at least one of the structures as shown in the formula (1) or the structures as shown in the formula (2);
wherein a weight ratio of the cation-containing structure in the flexible hydrophilic aspartic resin is 2-15%.
2 . The flexible hydrophilic aspartic resin according to claim 1 , wherein a weight ratio of the first polyether segment in the flexible hydrophilic aspartic resin is 3-35%.
3 . The flexible hydrophilic aspartic resin according to claim 1 , wherein both ends of the second polyether segment are directly chemically bonded to the —NHCOO— group or the —OOC(N—)CONH— group.
4 . The flexible hydrophilic aspartic resin according to claim 1 , wherein a weight ratio of the second polyether segment in the flexible hydrophilic aspartic resin is 5-45%.
5 . The flexible hydrophilic aspartic resin according to claim 1 , wherein the flexible hydrophilic aspartic resin is obtained by reacting a hydrophilic isocyanate prepolymer with a second polyether diol, and then reacting with a first amino resin;
the hydrophilic isocyanate prepolymer contains the first polyether segment;
the second polyether diol contains the second polyether segment;
or, the flexible hydrophilic aspartic resin is obtained by reacting a tertiary amine-containing isocyanate prepolymer with a second amino resin followed by neutralization;
structures of the first amino resin and the second amino resin are independently as shown in formula (5):
wherein R is an n-valent organic group with a number-average molecular weight of 50-5000 that is reaction-inert to isocyanate at 100° C., R 1 and R 2 are independently selected from C 1 -C 8 alkyl groups, and n is 2, 3, or 4.
6 . The flexible hydrophilic aspartic resin according to claim 5 , wherein a weight ratio of NCO groups in the hydrophilic isocyanate prepolymer and the tertiary amine-containing isocyanate prepolymer is independently 5-40%.
7 . The flexible hydrophilic aspartic resin according to claim 5 , wherein a molar ratio of the second polyether diol to the first amino resin is 1:10-1:1;
a sum of mole numbers of active hydrogen in the second polyether diol and active hydrogen in the first amino resin to a mole number of NCO groups in the hydrophilic isocyanate prepolymer is in a ratio of 0.7-3:1; or
a molar ratio of NCO groups in the tertiary amine-containing isocyanate prepolymer to NH groups in the second amino resin is 1:1-5.
8 . An emulsion, wherein the emulsion is obtained by dispersing a raw material component comprising the flexible hydrophilic aspartic resin according to claim 1 in water.