The method of dicyclopentadiene modified unsaturated polyester resin
A polyester resin, unsaturated technology, applied in the field of modification of unsaturated polyester resin (UPR), can solve the problem of low heat distortion temperature
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Embodiment 1
[0020] (1) Put 2.45 kg of maleic anhydride and an appropriate amount of water (about 0.18 kg) in a reactor equipped with a stirring and temperature control device, stir and raise the temperature to 70°C to stop the temperature rise, and keep in this state for 30 to 60 minutes ;
[0021] (2) Add dicyclopentadiene (DCPD) in batches to the reactor under the conditions of 120°C and 140°C respectively, adding a total of 2.04 kg of DCPD. After the addition is complete, add ethylene glycol and monopolyethylene. Glycol mixture (total 0.72 kg), after the addition is completed, first dehydrate under normal pressure (1atm) at elevated temperature, the dehydration temperature is 210℃, the dehydration time is 5 hours to 7 hours, and then the vacuum degree is equal to 0.09MPa. When the acid value is 27-30, stop dehydration and obtain liquid material;
[0022] (3) Add 1.00 kg of hydroquinone and an appropriate amount of paraffin (about 0.30 kg) to the liquid material obtained in step (2) at 190°...
Embodiment 2
[0024] (1) Put 2.45 kg of maleic anhydride and an appropriate amount of water (about 0.18 kg) in a reactor equipped with a stirring and temperature control device, stir and raise the temperature to 70°C to stop the temperature rise, and keep it in this state for 30 minutes to 60 minute;
[0025] (2) Add dicyclopentadiene (DCPD) in batches to the reactor under the conditions of 140°C and 160°C respectively, adding a total of 2.84 kg of DCPD. After the addition is complete, add ethylene glycol and monoacetate. Glycol mixture (total 0.72 kg), after the addition is completed, first, under normal pressure (1atm), heat up dehydration, the dehydration temperature is 190℃, the dehydration time is 5 hours to 7 hours, and then the vacuum degree is equal to 0.09MPa. When the acid value is 27-30, stop dehydration and obtain liquid material;
[0026] (3) Add 1.0 kg of hydroquinone and an appropriate amount of paraffin (about 0.40 kg) to the liquid material obtained in step (2) at 180°C, stir a...
Embodiment 3
[0028] (1) Put 2.66 kg of maleic anhydride and an appropriate amount of water (about 0.18 kg) in a reactor equipped with a stirring and temperature control device, stir and raise the temperature to 70°C~80°C, stop the temperature rise, and keep it at 60°C. minute;
[0029] (2) Dicyclopentadiene (DCPD) was added to the reactor in batches under the conditions of 130°C and 150°C, and a total of 2.28 kg of DCPD was added. After the DCPD was added, ethylene glycol and a shrink were added. Ethylene glycol mixture (a total of 0.38 kg), after the addition is completed, first, under normal pressure (1atm), heat up the dehydration, the dehydration temperature is 200 ℃, the dehydration time is 5 hours to 7 hours, and then the vacuum is equal to or higher than 0.09 Dehydrate under MPa conditions to an acid value of 27-30, stop dehydration, and obtain liquid material;
[0030] (3) Add 0.86 kg of hydroquinone and an appropriate amount of paraffin (about 0.60 kg) to the liquid material obtained ...
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