Hydrolysis-resistant polyurethane resin and preparation method thereof
A polyurethane resin and hydrolysis-resistant technology, which is applied in the field of polyurethane materials, can solve the problems of reduced peel strength, difficulty in washing polyurethane resin, and poor hydrolysis resistance, and achieve high peel strength, good water-repellent effect, and high hydrolysis resistance. Effect
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Embodiment 1
[0034] 1) Take the raw material by the following parts by weight:
[0035]
[0036] The polyester polyol is formed by condensation of ethylene glycol, 1.4 butanediol and adipic acid in a mass ratio of 1:1, and the molecular weight is 2000; the polyether polyol is polytetrahydrofuran diol; the The diisocyanate is toluene diisocyanate; the fluorine-free water repellant is a paraffin water repellent, purchased from Quanzhou Libai Chemical Materials Co., Ltd., and the brand is YT-70;
[0037] 2) adding polyester polyol and polyether polyol to 200 parts by weight of solvent, heating and stirring to dissolve to obtain a mixed solution;
[0038] 3) Cool down the mixed solution obtained in step 2) to 60-70° C., and then add 8.7 parts by weight of diisocyanate to the mixed solution;
[0039] 4) Heat the solution obtained in step 3) to 70-80°C for pre-polymerization. When the viscosity of the solution reaches 60,000-70,000 cps / 25°C, add ethylene glycol, the remaining diisocyanate an...
Embodiment 2
[0043] 1) Take the raw material by the following parts by weight:
[0044]
[0045]
[0046] The polyester polyol is formed by condensation of ethylene glycol, a mixture of 1.4 propylene glycol and succinic acid in a mass ratio of 1:1, and the molecular weight is 3000; the polyether polyol is polyoxypropylene glycol; the two The isocyanate is isophorone diisocyanate; the fluorine-free water repellant is a methylol water repellent, purchased from Quanzhou Libai Chemical Materials Co., Ltd., and the product brand is YT-35;
[0047] 2) adding polyester polyol and polyether polyol to 200 parts by weight of solvent, heating and stirring to dissolve to obtain a mixed solution;
[0048] 3) Cool down the mixed solution obtained in step 2) to 60-70° C., and then add 8.51 parts by weight of diisocyanate to the mixed solution;
[0049]4) Heat the solution obtained in step 3) to 70-80°C for pre-polymerization. When the viscosity of the solution reaches 60,000-70,000 cps / 25°C, add e...
Embodiment 3
[0053] 1) Take the raw material by the following parts by weight:
[0054]
[0055] The polyester polyol is formed by condensation of ethylene glycol, a mixture of 1.4 butanediol and adipic acid, with a molecular weight of 3000; the polyether polyol is polyoxypropylene glycol; the diisocyanate is diphenyl methyl methane diisocyanate; the fluorine-free water repellent is a silicone water repellant; purchased from Quanzhou Libai Chemical Materials Co., Ltd., product brand YT-62;
[0056] 2) adding polyester polyol and polyether polyol to 200 parts by weight of solvent, heating and stirring to dissolve to obtain a mixed solution;
[0057] 3) Cool down the mixed solution obtained in step 2) to 60-70°C, and then add 9.58 parts by weight of diisocyanate to the mixed solution;
[0058] 4) Heat the solution obtained in step 3) to 70-80°C for pre-polymerization. When the viscosity of the solution reaches 60,000-70,000 cps / 25°C, add ethylene glycol, the remaining diisocyanate and th...
PUM
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