Vim li cas cov kua silicone thiaj siv tau dav hauv ntau qhov chaw?

1. Kev taw qhia txog cov roj hmab silicone kua nrog kev ntxiv molding

Cov roj hmab silicone kua nrog kev ntxiv molding yog tsim los ntawm vinyl polysiloxane ua cov polymer yooj yim, polysiloxane nrog Si-H daim ntawv cog lus ua tus neeg sawv cev txuas, nyob rau hauv qhov muaj platinum catalyst, ntawm chav tsev kub lossis cua sov nyob rau hauv qhov txuas txuas vulcanization ntawm ib chav kawm ntawm cov khoom siv silicone. Txawv ntawm cov roj hmab silicone kua condensed, molding kua silicone vulcanization txheej txheem tsis tsim cov khoom by-product, me me shrinkage, tob vulcanization thiab tsis muaj corrosion ntawm cov khoom sib cuag. Nws muaj qhov zoo ntawm ntau qhov kub thiab txias, zoo heev tshuaj lom neeg tsis kam thiab huab cua tsis kam, thiab tuaj yeem yooj yim lo rau ntau qhov chaw. Yog li ntawd, piv nrog cov kua silicone condensed, kev txhim kho ntawm cov kua silicone molding yog sai dua. Tam sim no, nws tau siv ntau dua thiab ntau dua hauv cov khoom siv hluav taws xob, tshuab, kev tsim kho, kev kho mob, tsheb thiab lwm yam teb.

2. Cov Cheebtsam Tseem Ceeb

Cov Khoom Siv Polymer

Ob hom polysiloxane uas muaj vinyl hauv qab no yog siv ua cov polymers hauv paus rau kev ntxiv cov kua silicone. Lawv qhov hnyav faib tawm yog dav, feem ntau ntawm ntau txhiab txog 100,000-200,000. Cov polymer hauv paus feem ntau siv rau cov kua silicone ntxiv yog α, ω -divinylpolydimethylsiloxane. Nws tau pom tias qhov hnyav molecular thiab cov ntsiab lus vinyl ntawm cov polymers yooj yim tuaj yeem hloov pauv cov yam ntxwv ntawm cov kua silicone.

tus neeg sawv cev sib txuas

Tus neeg sawv cev crosslinking siv rau kev ntxiv molding kua silicone yog cov organic polysiloxane uas muaj ntau dua 3 Si-H bonds hauv molecule, xws li linear methyl-hydropolysiloxane uas muaj Si-H pawg, nplhaib methyl-hydropolysiloxane thiab MQ resin uas muaj Si-H pawg. Feem ntau siv yog linear methylhydropolysiloxane ntawm cov qauv hauv qab no. Nws pom tias cov khoom siv kho tshuab ntawm silica gel tuaj yeem hloov pauv los ntawm kev hloov cov ntsiab lus hydrogen lossis cov qauv ntawm tus neeg sawv cev crosslinking. Nws pom tias cov ntsiab lus hydrogen ntawm tus neeg sawv cev crosslinking yog proportional rau lub zog tensile thiab hardness ntawm silica gel. Gu Zhuojiang et al. tau txais cov roj silicone uas muaj hydrogen nrog cov qauv sib txawv, qhov hnyav molecular sib txawv thiab cov ntsiab lus hydrogen sib txawv los ntawm kev hloov cov txheej txheem synthesis thiab cov mis, thiab siv nws ua tus neeg sawv cev crosslinking los synthesize thiab ntxiv kua silicone.

cov tshuaj ua kom lub cev ua haujlwm

Yuav kom txhim kho qhov ua tau zoo ntawm cov catalysts, platinum-vinyl siloxane complexes, platinum-alkyne complexes thiab nitrogen-modified platinum complexes tau npaj tseg. Ntxiv rau hom catalyst, qhov ntau ntawm cov khoom siv silicone kua kuj tseem yuav cuam tshuam rau kev ua tau zoo. Nws pom tias kev nce qhov concentration ntawm platinum catalyst tuaj yeem txhawb kev sib txuas ntawm cov pab pawg methyl thiab tiv thaiv kev lwj ntawm cov saw hlau tseem ceeb.

Raws li tau hais los saum toj no, lub tshuab vulcanization ntawm cov kua silicone ib txwm muaj yog qhov hydrosilylation reaction ntawm cov polymer hauv paus uas muaj vinyl thiab cov polymer uas muaj hydrosilylation bond. Cov kua silicone ib txwm muaj additive molding feem ntau xav tau cov pwm tawv kom tsim cov khoom kawg, tab sis cov thev naus laus zis tsim khoom ib txwm muaj qhov tsis zoo ntawm tus nqi siab, lub sijhawm ntev, thiab lwm yam. Cov khoom feem ntau tsis siv rau cov khoom siv hluav taws xob. Cov kws tshawb fawb pom tias ib qho series ntawm silicas nrog cov khoom zoo dua tuaj yeem npaj los ntawm cov txheej txheem kho tshiab siv mercaptan - ob chav bond ntxiv kua silicas. Nws cov khoom siv kho tshuab zoo heev, thermal stability thiab lub teeb transmittance tuaj yeem ua rau nws siv rau hauv ntau qhov chaw tshiab. Raws li qhov mercapto-ene bond reaction ntawm branched mercaptan functionalized polysiloxane thiab vinyl terminated polysiloxane nrog qhov hnyav molecular sib txawv, silicone elastomers nrog adjustable hardness thiab mechanical khoom tau npaj. Cov ntawv luam tawm elastomers qhia txog kev daws teeb meem luam ntawv siab thiab cov khoom siv kho tshuab zoo heev. Qhov ntev ntawm cov silicone elastomers tuaj yeem ncav cuag 1400%, uas yog siab dua li cov elastomers UV curing uas tau tshaj tawm thiab siab dua li cov silicone elastomers thermal curing uas ncab tau zoo tshaj plaws. Tom qab ntawd cov silicone elastomers uas ncab tau zoo heev tau siv rau cov hydrogels doped nrog carbon nanotubes los npaj cov khoom siv hluav taws xob uas ncab tau. Silicone uas luam tawm tau thiab ua tau muaj kev cia siab dav hauv cov neeg hlau mos, cov actuators uas yoog tau, cov khoom cog kho mob thiab lwm yam teb.