Aggrutination yog cov txheej txheem raws li hauv-situ polymerization ntawm organic monomer binder rau tsim cov polymer network thiab agglomerate cov hmoov sau ua ke. Qhov zoo ntawm kev txhaj tshuaj molding yog:
1) Tsis muaj qhov tshwj xeeb xav tau rau cov hmoov, thiab cov khoom uas muaj qhov loj thiab cov duab thiab cov phab ntsa tuab tuaj yeem npaj tau; 2) Cov pwm tuaj yeem xaiv ntau yam khoom siv, luv molding voj voog; 3) Lub zog loj ntawm cov pob zeb ntub dej thiab qhuav, tuaj yeem ua tshuab, cov ntsiab lus tsis tshua muaj cov khoom siv hauv cov khoom siv hluav taws xob, qhov zoo sib xws ntawm kev ua haujlwm ntawm billet thiab sintered lub cev, yooj yim rau kev tswj cov txheej txheem, txheej txheem thiab kev ua haujlwm yog qhov yooj yim; 4) Cov khoom siv yooj yim, tus nqi qis.
Kev Txhaj Tshuaj Txheej Txheem Flow Daim Ntawv
Cov txheej txheem npaj npaj ntawm kev txhaj tshuaj yog tau to taub zoo, tsis muaj ntau cov kev sib nkag siab zoo, tab sis cov kev nyuaj siab uas yuav tsum muaj nyob hauv hom kev npaj hom yuav muaj txiaj ntsig zoo.
1, Nyob ntawm seb qhov xav tau hnyav npaum li cas yog cov tshuaj aqueous
Gelatinized gel systems feem ntau muab faib ua ob lub hauv paus loj: tsis yog dej-raws li gel system thiab dej-raws li gel system.
Cawv, hydrocarbons, ethers, ketones thiab lwm cov kuab tshuaj organic feem ntau yog siv hauv cov tshuab tsis muaj dej. Lub kaw lus muaj nws tus kheej tsis tshua muaj viscosity thiab qis vapor siab ntawm qhov kub ntawm qhov sib txuas cov tshuaj tiv thaiv. Lub ntsiab tsis zoo yog tias cov tshuaj organic yuav ua rau ib puag ncig muaj kuab paug, uas tsis tsim nyog rau kev tiv thaiv ib puag ncig. Dej-raws li gel system, uas feem ntau yog acrylic ester system thiab acrylamide (AM) system tam sim no, tau dhau los ua ib qho ntawm cov khoom siv hluav taws xob zoo tshaj plaws hauv xyoo tas los no vim tias kev ua haujlwm yooj yim ntawm cov dej-raws li kev txhaj tshuaj molding txheej txheem, tsis tshua muaj raw khoom. cov nqi khoom siv thiab kev tiv thaiv ib puag ncig.
Txawm li cas los xij, qib neurotoxicity ntawm AM yog qib 4, thiab nws muaj zog dej solubility thiab tuaj yeem nkag mus rau tib neeg lub cev los ntawm daim tawv nqaij thiab cov mucous membranes. Yog li ntawd, nws yog ib qho tsim nyog los tsim kom muaj cov tshuaj toxicity tsawg lossis tsis muaj tshuaj lom hom kab mob.
2, raws li cov txheej txheem organic polymerization
(1) Cov tshuaj tiv thaiv dawb radical: Hauv cov tshuaj tiv thaiv dawb radical polymerization, cov pa oxygen muaj qhov cuam tshuam ntawm kev cuam tshuam cov polymerization, uas ua rau muaj kev cuam tshuam ntawm qhov chaw ntsuab, yog li muaj qee qhov yuav tsum tau ua rau huab cua. (2) Nucleophilic ntxiv cov tshuaj tiv thaiv: tiv thaiv qhov tshwm sim ntawm qhov tshwm sim tshwm sim los ntawm oxygen cuam tshuam cov dawb radical polymerization, uas yog ib qho tseem ceeb hauv kev tsim cov ceramic hydrogels hauv huab cua. (3) Natural gel system: Cov teeb meem kev tiv thaiv ib puag ncig tau nce kev nyiam, thiab cov txheej txheem gel tau tsim.