聚氨酯预聚体工艺流程.pdf

聚氨酯预聚体工艺流程

英文回答：

Polyurethane(PU)isaversatilepolymerthatiswidely

usedinvariousindustriesduetoitsexcellentmechanical

propertiesandchemicalresistance.Theproductionprocess

ofPUinvolvesthesynthesisofapre-polymer,whichis

thenfurtherreactedwithacuringagenttoformthefinal

product.

ThefirststepinthePUproductionprocessisthe

synthesisofthepre-polymer.Thisistypicallydoneby

reactingapolyolwithanisocyanate.Thepolyolisa

compoundwithmultiplehydroxylgroups,whilethe

isocyanateisacompoundwithmultipleisocyanate

functionalgroups.Thereactionbetweenthepolyolandthe

isocyanateformsapre-polymerwithurethanelinkages.

Oncethepre-polymerisformed,itisthenmixedwitha

curingagent.Thecuringagent,alsoknownasachain
extenderoracrosslinker,reactswiththeremaining

isocyanategroupsinthepre-polymertoformathree-

dimensionalnetworkstructure.Thisreactionisknownas

thecuringorcrosslinkingreaction.

Thecuringagentcanbeacompoundwithmultipleamine

groups,suchasadiamineoratriamine.Theaminegroups

reactwiththeisocyanategroupstoformurealinkages,

whichcontributetothefinalnetworkstructureofthePU.

Othercompounds,suchaswateroracatalyst,canalsobe

addedtothemixturetocontrolthereactionrateorto

modifythepropertiesofthefinalproduct.

Afterthecuringreactioniscomplete,thePUmaterial

istypicallysubjectedtopost-curingorpost-processing

stepstofurtherenhanceitsproperties.Thesestepsmay

includeheattreatment,surfacetreatment,ortheaddition

ofadditivessuchasfillersorpigments.

Insummary,theproductionprocessofPUinvolvesthe

synthesisofapre-polymerbyreactingapolyolwithan

isocyanate,followedbythecuringreactionwithacuring
agenttoformathree-dimensionalnetworkstructure.Post-

curingorpost-processingstepsmaybeperformedto

optimizethepropertiesofthefinalproduct.

中文回答：

聚氨酯（PU）是一种多功能聚合物，由于其优异的机械性能和

耐化学性能而被广泛应用于各个行业。PU的生产过程涉及预聚物的

合成，然后与固化剂进一步反应形成最终产品。

PU生产过程的第一步是合成预聚物。通常通过聚醇与异氰酸酯

反应来完成。聚醇是一种具有多个羟基官能团的化合物，而异氰酸

酯是一种具有多个异氰酸酯官能团的化合物。聚醇与异氰酸酯之间

的反应形成了具有脲酸酯键的预聚物。

一旦形成了预聚物，就会与固化剂混合。固化剂，也称为链延

长剂或交联