Qhov txo qhov siab ntawm qhov ntsuas hauv cov pwm tom qab molding characterizes cov nyhuv ntawm hydroxypropyl methylcellulose ntawm lub ntim stability ntawm foamed qhob.Nws tuaj yeem pom tau tias qhov ntau npaum li cas ntawm 0.05% hydroxypropyl methylcellulose yog qhov zoo tagnrho, thiab thaum qhov ntau npaum ntawm hydroxypropylmethylcellulose yog 0.05%, qhov txo qhov siab nce ntxiv.Kev tsom xam pom tau tias thaum hydroxypropyl methylcellulose tsim nyog, nws tuaj yeem txo qhov ntim ntawm lub cev tawv thaum txhim kho fluidity ntawm slurry.Thaum lub sij hawm hardening txheej txheem ntawm slurry, dej tsis tu ncua.Internal ua npuas ncauj kuj tsis tu ncua disillusioned, thiab lub shortening ntawm lub hardened lub cev yog inevitable.Qhov no ua rau lub ntim ntawm lub cev tawv tsis ruaj khov, thiab kev sib xyaw ntawm hydroxypropyl methylcellulose tsis tsuas yog muab lub cev tawv xwb Nws tsis tsuas yog muaj cov dej tuav tau zoo, tab sis kuj ua kom ruaj khov thiab ua kom tawv nqaij thawj zaug los ntawm cov yam ntxwv ntawm slurry hardening thiab hydroxypropyl. methylcellulose zaj duab xis hardening tib lub sij hawm, thiaj li mus ua si ib tug zoo ua npuas ncauj stabilizing nyhuv thiab txo lub shrinkage ntawm hardened lub cev ntim.
Ua npuas ncauj stabilization
Raws li tus nqi ntawm hydroxypropyl methylcellulose tau nce mus rau 0.5%, qhov poob qis me ntsis.Cov ntaub ntawv qhia tau hais tias thaum cov ntsiab lus ntawm hydroxypropyl methylcellulose tsis tshaj 0.05%, qhov sib ntxiv ntawm hydroxypropyl methylcellulose tuaj yeem txhim kho fluidity thiab viscosity ntawm foamed qhob slurry.Tom qab cov hydroxypropyl methylcellulose yaj lawm, ib qho moist saj zawg zog elastic zaj duab xis yog tsim los ntawm cov khoom theem hais thiab cov pa roj theem npuas, uas muaj cov nyhuv du zoo thaum lub sij hawm sib tov.Slurry yog dawb thiab zoo "pob", uas zoo txhim kho lub fluidity ntawm freshly mix slurry: tab sis yog hais tias tus nqi ntawm hydroxypropyl methylcellulose ntau tshaj 0.5%, slurry yuav dhau viscous thiab fluidity yuav txo tau zoo heev.Txawm li cas los xij, 0.05% hydroxypropyl methylcellulose tsis tsuas yog ua kom cov slump, tab sis kuj ua rau cov pa npuas, uas yog qhov zoo tagnrho rau kev ntxiv cov neeg.
Post lub sij hawm: Apr-23-2023