Cov yam ntxwv kub ntawm curing agent

Curing kub thiab kub tsis kam ntawm curing agent
Kev kho kub ntawm ntau yam tshuaj tua kab mob sib txawv, thiab cov khoom siv kho cua sov ntawm cov khoom kho kuj txawv heev. Feem ntau hais lus, siv tus neeg sawv cev kho nrog qhov kub kho siab tuaj yeem tau txais cov khoom kho nrog cov cua sov zoo heev. Rau ntxiv polymerization curing agents, curing kub thiab tshav kub kuj nce nyob rau hauv cov nram qab no kev txiav txim:
Aliphatic polyamines < alicyclic polyamines < aromatic polyamines < phenolic acid < anhydride
Lub tshav kub tsis kam ntawm catalytic ntxiv polymerization curing cov neeg ua haujlwm yog kwv yees li ntawm qib ntawm aromatic polyamines. Lub tshav kub tsis kam ntawm anionic polymerization (tertiary amines thiab imidazoles) thiab cationic polymerization (BF3 complexes) yog qhov zoo ib yam. Qhov no feem ntau yog vim hais tias txawm hais tias cov tshuaj tiv thaiv thawj zaug yog qhov sib txawv, lawv thiaj li tsim tau ib qho kev sib koom ua ke los ntawm ether bonds.
Cov tshuaj tiv thaiv kho yog cov tshuaj tiv thaiv tshuaj, uas cuam tshuam zoo heev los ntawm kev kho kub. Raws li qhov kub thiab txias, cov tshuaj tiv thaiv ceev nce thiab lub sij hawm gel yuav luv dua; lub logarithm ntawm lub gel lub sij hawm feem ntau qhia tau hais tias ib tug linear downward sib nrog rau qhov nce ntawm qhov curing kub. Txawm li cas los xij, yog tias qhov kub thiab txias siab dhau lawm, qhov kev ua tau zoo ntawm cov khoom kho tau feem ntau yuav txo qis, yog li muaj qhov txwv siab tshaj plaws rau qhov kho qhov kub; qhov kub uas cuam tshuam qhov curing ceev thiab kev ua tau zoo ntawm cov khoom kho yuav tsum raug xaiv raws li qhov tsim nyog curing kub. Raws li qhov kub thiab txias, cov tshuaj tua kab mob tuaj yeem muab faib ua plaub pawg: cov tshuaj tua hluav taws kub qis muaj qhov kub kub hauv chav tsev kub; chav tsev kub curing agents muaj qhov kub ntawm chav tsev kub txog 50 degree; nruab nrab-kub curing agents muaj ib tug curing kub ntawm 50 mus rau 100 degree; thiab high-temperature curing agents muaj qhov kub thiab txias siab tshaj 100 degree. Muaj ob peb hom tshuaj tua kab mob uas tsis tshua muaj kub, suav nrog polythiols thiab polyisocyanates; T-31 hloov amines thiab YH{10}} hloov kho amines tsim thiab muab tso rau hauv ntau lawm hauv Suav teb tuaj yeem kho tau qis dua 0 degree . Muaj ntau ntau hom tshuaj tua kab mob hauv chav tsev kub: aliphatic polyamines, alicyclic polyamines; Tsis tshua muaj molecular hnyav polyamides thiab hloov kho aromatic amines. Qee cov alicyclic polyamines, tertiary amines, imidazoles thiab boron trifluoride complexes yog nyob rau hauv nruab nrab-kub curing hom. Cov tshuaj tua kab mob kub kub muaj xws li cov tshuaj tsw qab polyamines, acid anhydrides, resol phenolic resins, amino resins, dicyandiamide thiab hydrazides.
Rau qhov kub-kub kho tshuab, qhov kho qhov kub thiab txias feem ntau muab faib ua ob theem: qhov kub thiab txias yog siv ua ntej gelation, thiab tom qab ncav cuag lub xeev gel los yog lub xeev me ntsis siab dua li lub xeev gel, cov cua kub kub yog siv rau kev tshaj tawm. - kho. Cov theem yav dhau los ntawm kev kho yog hu ua pre-kho.