Modified dioscorea opposita thunb starch prepolymer and degradable polyurethane foam material prepared from prepolymer
A technology of starch prepolymer and prepolymer, which is applied in the field of polyurethane foam materials and can solve problems such as not being widely used
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Embodiment 1
[0027] The preparation of modified Huai potato starch prepolymer comprises the following steps:
[0028] (1) In a 250 mL three-necked flask equipped with a thermometer, agitator and nitrogen protection, add 20 g of hexamethylene diisocyanate (HDI) and polycaprolactone (PCL220, hydroxyl value: 56 mgKOH / g, molecular weight 2000) ) 118.8g, start the stirrer, raise the temperature to 80°C, react at 80±2°C for 3 to 5 hours, and then degas under negative pressure until there are no bubbles to obtain polycaprolactone prepolymer.
[0029] (2) At 60-70°C, dissolve 100 mg of modified Huai potato starch and 1000 mg of polycaprolactone prepolymer obtained in step (1) in 100 ml of dimethyl sulfoxide solution, and each ml of dimethyl sulfoxide in Add mass 56mg catalyst NaCNBH 3 , the reaction was stirred for 2 to 3 days, and the same amount of NaCNBH was added every day during the reaction. 3 (ie 56mg). After the reaction is completed, the obtained mixed solution is cooled to room temper...
Embodiment 2
[0035] Example 2: Same as Example 1, wherein the modified Huaishu starch was added in an amount of 200 mg to obtain a prepolymer containing 20% modified starch.
Embodiment 3
[0036] Example 3: Same as Example 1, wherein, the modified Huaishu starch was added in an amount of 300 mg to obtain a prepolymer containing 30% modified starch.
[0037] Table 1: Prepolymer performance index of modified starch obtained in Examples 1-3
[0038] Example 1 2 3 Viscosity (25℃, mPa.s) 650 734 965 equivalent 126 144 186
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