Polyester polyurethane material with long-term hydrolysis resistance
A technology of polyester polyurethane and polyester polyol, applied in the field of polyester polyurethane materials, can solve the problems such as not being able to fully meet the requirements of the industry
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[0119] Preparation of polyester polyurethane material
[0120] The polyester polyurethane material of the present invention can be prepared by mixing the above components at 20-80°C, preferably 30-60°C, in the presence of an optional catalyst and an optional foaming agent and surfactant ; Then, inject the mixture into the mold by opening or closing the mold, and release the polyurethane product after 1-15 minutes. Specific details can be found in Kunststoff Handbuch, Volume VII, Polyurethanes, 1994, Dr. G. Oertel, Carl-Hanser-Verlag, Munich. The mold can be a common mold for preparing polyester polyurethane materials in the prior art, and the reaction system can be reacted in the mold to obtain the polyurethane product provided by the present invention.
[0121] The isocyanate index of the reaction can be optimized by methods well known in the art.
[0122] The isocyanate index of the reaction is preferably but not limited to 50-160, particularly preferably 80-120, and the...
Embodiment 1-3
[0139] Embodiment 1-3: the preparation of the first polyester polyol
[0140] Select a 10-liter flask, install a stirrer, a 50 cm packed rectification column, a thermometer, a nitrogen inlet pipe, a distillation head and a diaphragm vacuum pump on it, and then add raw materials according to the amount shown in Table 1 under nitrogen protection. The mixture was heated slowly at atmospheric pressure to 200°C over 60 minutes. After reacting under this condition for 5 hours, water was no longer generated in the reaction, and stannous chloride dihydrate was added according to the amount shown in Table 1, and the pressure slowly dropped to 20mbar. After the total reaction was carried out for 40 hours, in order to compensate for the distilled 1,4-butanediol and adjust the hydroxyl value to the desired value, 88 g of 1,4-butanediol was added under normal pressure and reacted at 200° C. for 6 hours.
[0141] The characteristics of the prepared first polyester polyol are shown in the t...
Embodiment 3-4
[0145] Pass the polyols and additives in the amounts shown in Table 3 through a PENDRAULIK agitator, and mix them evenly at 1400rpm. The weights shown in the table are all parts by weight. Then, the obtained mixture of polyols and additives (45°C) and the amount of isocyanate (40°C) listed in Table 3 are mixed and reacted through a GUSBI low-pressure pouring foam machine (GUSBI Company, Italy), and the temperature is controlled at 50°C. In the mold (200mm*200mm*10mm), the mold is closed, the reaction is cured for 5 minutes, and the mold is demoulded to obtain polyurethane. Place the prepared flaky polyurethane test piece at room temperature for no less than 48 hours before testing.
[0146] The hydrolysis test is carried out at 70°C and 95% relative humidity. Before the sample is subjected to the hydrolysis test, the initial physical properties of the sample are measured according to the following standards:
[0147] Density: DIN EN ISO 845,
[0148] Hardness: DIN 53505, ...
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Abstract
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