A kind of modified unsaturated polyester resin and its synthesis process
A technology of polyester resin and synthesis process, which is applied in the field of modified unsaturated polyester resin and its synthesis process, which can solve the problems of unsatisfactory application requirements, low heat distortion temperature, poor heat resistance, etc., and achieve rich space branches The effect of improving high temperature processing performance and improving heat resistance
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Embodiment 1
[0030] A kind of synthetic technique of modified unsaturated polyester resin, concrete steps are as follows:
[0031] (1) Add pentaerythiol, 1,4-cyclohexanedimethanol, tetraethylene glycol, maleic anhydride and esterification catalyst in turn into the reaction kettle with water agent, and continue to pass nitrogen , heating to 160°C at a heating rate of 8°C / hour, stirring for 30 minutes, then raising the temperature to 230°C at a heating rate of 2°C / hour, and stirring for 2 hours;
[0032] (2) Cool down to 190°C, add terephthalic acid, trimellitic anhydride and modifier, then raise the temperature to 270°C at a heating rate of 12°C / hour, and stir for 30 minutes;
[0033] (3) Lower the temperature to 180°C, add a curing accelerator, continue to stir for 1 hour, remove most of the water-carrying agent under reduced pressure for the first time, then add water, reduce the pressure for the second time, and solidify after natural cooling to obtain the product.
[0034] Among them, ...
Embodiment 2
[0038] A kind of synthetic technique of modified unsaturated polyester resin, concrete steps are as follows:
[0039](1) Add pentaerythiol, 1,4-cyclohexanedimethanol, tetraethylene glycol, maleic anhydride and esterification catalyst in turn into the reaction kettle with water agent, and continue to pass nitrogen , heating to 180°C at a heating rate of 10°C / hour, stirring for 40 minutes, then raising the temperature to 240°C at a heating rate of 3°C / hour, and stirring for 3 hours;
[0040] (2) Cool down to 200°C, add terephthalic acid, trimellitic anhydride and modifier, then raise the temperature to 280°C at a heating rate of 15°C / hour, and stir for 40 minutes;
[0041] (3) Lower the temperature to 190°C, add a curing accelerator, continue to stir for 2 hours, remove most of the water-carrying agent under reduced pressure for the first time, then add water, reduce the pressure for the second time, and solidify after natural cooling to obtain the product.
[0042] Among them,...
Embodiment 3
[0046] A kind of synthetic technique of modified unsaturated polyester resin, concrete steps are as follows:
[0047] (1) Add pentaerythiol, 1,4-cyclohexanedimethanol, tetraethylene glycol, maleic anhydride and esterification catalyst in turn into the reaction kettle with water agent, and continue to pass nitrogen , heating to 180°C at a heating rate of 8°C / hour, stirring for 30 minutes, then raising the temperature to 230°C at a heating rate of 3°C / hour, and stirring for 3 hours;
[0048] (2) Cool down to 190°C, add terephthalic acid, trimellitic anhydride and modifier, then raise the temperature to 270°C at a heating rate of 15°C / hour, and stir for 40 minutes;
[0049] (3) Lower the temperature to 180°C, add a curing accelerator, continue to stir for 2 hours, remove most of the water-carrying agent under reduced pressure for the first time, then add water, reduce the pressure for the second time, and solidify after natural cooling.
[0050] Among them, the modifier is obtai...
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Abstract
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