PBTispolybutyleneterephthalatePBT,whichbelongstopolyesterseries.Itisakindofopalescenttranslucenttoopaquecrystallinethermoplasticpolyesterresinmadebypolycondensationof1.4butanediolwithterephthalicacidPTAorterephthalateDMTandmixingprocess.TogetherwithPET,itiscollectivelyreferredtoasthermoplasticpolyesterorsaturatedpolyester.Duetoitsheatresistance,weatherresistance,drugresistance,excellentelectricalproperties,lowwaterabsorption,andgoodgloss,PBTiswidelyusedinelectronics,automotiveparts,machinery,householdproducts,etc.PBTproducts,togetherwithPPE,PC,POM,PA,arecollectivelyreferredtoasthefivemajorgeneral-purposeengineeringplastics.Esterexchangemethod:TheesterexchangemethodusesdimethylterephthalateDMTastherawmaterial.Firstly,itundergoesesterexchangewith1,4-butanedioltogeneratedibutyleneterephthalate,whichisthencondensedtoformpolybutyleneterephthalate.Theesterexchangemethodusesanexcessratioof1,4-butanediol,andthemolarratioofDMTto1,4-butanediolis1ːFrom1.3to1.7,thereactiontemperatureisabout200℃,whichisconducivetotheformationofdibutylterephthalateinthedirectionofreactionequilibriumandcanreducetheoccurrenceofsidereactions.Thesecondstepofpolycondensationreactioniscarriedoutatatemperatureofabout250~260℃andreducedpressureto0.1~1mmHg.Theesterexchangemethodcanbecarriedoutintermittentlyorcontinuously.Itsadvantagesarethattheequipmentisrelativelysimple,thereactionconditionsarerelativelymild,andthestep-by-stepcontrolofesterexchangeandcondensationreactionsisrelativelyeasy,butbatchproductionhaslowefficiency.
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daima
发布时间:2023-06-29 10:08:38
The company covers an area of more than 20 mu, with a modern production plant of 15,000 square meters, a variety of production, testing equipment and instruments nearly 150 sets (sets), close to the Yangtze River, Beijing-Hangzhou Grand Canal, Beijing-Shanghai, Ningtong, Yangli highway, traffic is very convenient.
Add: Jinson Road, Shaobo Industrial concentration Area, Jiangdu City, Jiangsu Province
Tel: 0514-86583655
E-mail: yzjinsen@yzjinsen.cn
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