Method for preparing thermoplastic polyurethane elastomer with benzene ring structure by non-isocyanate method
A technology of thermoplastic polyurethane and non-isocyanate method, which is applied in the field of polyurethane to achieve the effects of excellent mechanical properties, good resilience and excellent mechanical properties
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Embodiment 1
[0032] 1) Preparation of hydroxyl-terminated terephthalic acid diester: Weigh 30 parts of dimethyl terephthalate and 140 parts of 1.4-butanediol in parts by weight, add 0.34 parts of tetrabutyl titanate, and react at 160°C After 5 hours, the reaction was stopped, cooled to room temperature, and recrystallized to obtain white dibutylene terephthalate solid powder with a melting point of 74.5°C.
[0033] 2) Preparation of hexamethylene diurethane diol: Weigh 58 parts of hexamethylenediamine and 110 parts of ethylene carbonate in parts by weight, react at 100°C for 6 hours under nitrogen protection, cool, filter and recrystallize to obtain white diurethane diol. Diurethane diol solid powder with a melting point of 95°C.
[0034] 3) Preparation of thermoplastic polyurethane elastomer with benzene ring structure: Weigh 28.6 parts of dibutylene terephthalate prepared in step 1), 22.7 parts of hexamethylene diurethane diol in step 2) by weight , 15.9 parts of polytetrahydrofuran eth...
Embodiment 2
[0036] Weigh 27.2 parts of dibutylene terephthalate prepared in Example 1 step 1), 21.7 parts of hexamethylene diurethane diol in Example 1 step 2), and 23.3 parts of polytetrahydrofuran ether diol in parts by weight. Alcohol 1000, 0.14 parts of stannous chloride as catalyst, heated to 170°C at normal pressure under the protection of nitrogen, the water pump gradually depressurized to 30mmHg and reacted for 0.5 hours, and then used the oil pump to decompress and react at 2-3mmHg until the viscosity of the system was not lower. Change again to obtain light yellow opaque thermoplastic polyurethane elastomer with benzene ring structure, Mn=18160, Mw=28677, melting point is 105.9°C, tensile strength is 11.90MPa, elongation at break is 729.07%, recovery rate is 87.50% .
Embodiment 3
[0038] Take by weight parts 32.9 parts of dibutylene terephthalate prepared in Example 1 step 1), 29.1 parts of hexamethylene diurethane diol in Example 1 step 2), 12.2 parts of polytetrahydrofuran ether diol Alcohol 650, 0.15 parts of stannous chloride as catalyst, heated to 170°C at normal pressure under the protection of nitrogen, the water pump gradually depressurized to 30mmHg and reacted for 0.5 hours, and then used the oil pump to depressurize and react at 2-3mmHg until the viscosity of the system was not lower. Change again to obtain light yellow opaque thermoplastic polyurethane elastomer with benzene ring structure, Mn=20992, Mw=41556, melting point is 103.9°C, tensile strength is 28.55MPa, elongation at break is 903.53%, recovery rate is 86.25% .
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Abstract
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