Process for preparing unsaturated polyester resin from waste polyester films produced in production of glass fiber reinforced plastics
A technology for waste polyester and polyester resin, used in recycling technology, plastic recycling, etc.
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Embodiment 1
[0023] Put 250Kg of measured 2-methyl-1,3 propanediol into the reaction kettle, start stirring, heat up to 88°C, and then put 650Kg of waste polyester film and measured composite catalyst (acetic acid Zinc / stannous oxide / tetrabutyl titanate (mass ratio: 1:2:1) 1.10Kg, continue to heat up, and take 7 hours to raise the reaction temperature to 230°C, keep the temperature for 3 hours, take samples to measure the acid value, When the acid value reaches 14mgKOH / g, lower the temperature to 140°C. During the reaction process, the vertical cooling water has been turned on for total reflux, and when the reaction temperature rises to 200°C, the horizontal cooling water is turned on to capture the small molecular substances produced in the reaction.
[0024] Put 415Kg of fumaric acid, 360Kg of resin alcohol A, 200Kg of diethylene glycol, 130Kg of propylene glycol, and 0.15Kg of polymerization inhibitor hydroquinone into the reactor, continue to stir and heat up, and heat up to 210°C in a...
Embodiment 2
[0035] Put 250Kg of measured 2-methyl-1,3 propanediol into the reaction kettle, start stirring, heat up to 90°C, then put 650Kg of waste polyester film and measured composite catalyst (acetic acid Zinc / stannous oxide / tetrabutyl titanate, the mass ratio is 1:2:1) 1.00Kg, continue to heat up, and take 6 hours to raise the reaction temperature to 240°C, keep the temperature for 3.5 hours, take a sample to measure the acid value, When the acid value reaches 16mgKOH / g, lower the temperature to 135°C. During the reaction process, the vertical cooling water has been turned on for total reflux, and when the reaction temperature rises to 200°C, the horizontal cooling water is turned on to capture the small molecular substances produced in the reaction.
[0036] Put 420Kg of fumaric acid, 375Kg of resin alcohol B, 210Kg of diethylene glycol, 140Kg of propylene glycol, and 0.12Kg of polymerization inhibitor hydroquinone into the reactor, continue to stir and heat up, and heat up to 220°C...
Embodiment 3
[0047] Put 250Kg of measured 2-methyl-1,3 propanediol into the reactor, start stirring, heat up to 90°C, and then put 600Kg of waste polyester film and measured composite catalyst (acetic acid Zinc / stannous oxide / tetrabutyl titanate, the mass ratio is 1:2:1) 1.00Kg, continue to heat up, and use 6 hours to raise the reaction temperature to 220°C, keep the temperature for 4 hours, take samples to measure the acid value, When the acid value reaches 15mgKOH / g, lower the temperature to 130°C. During the reaction process, the vertical cooling water has been turned on for total reflux, and when the reaction temperature rises to 200°C, the horizontal cooling water is turned on to capture the small molecular substances produced in the reaction.
[0048] Put 410Kg of fumaric acid, 340Kg of resin alcohol C, 190Kg of diethylene glycol, 135Kg of propylene glycol, and 0.16Kg of polymerization inhibitor tert-butylcatechol into the reaction kettle, continue to stir and heat up, and heat up to...
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