Yuav ua li cas los laij qhov hnyav ntawm cov khoom yas?
Dec 30, 2019
Yuav ua li cas los laij qhov hnyav ntawm cov khoom yas?
Cov khoom yas yog cov khoom xa tawm hu ua khoom siv hauv tsev thiab cov khoom tsim nrog cov yas ua cov khoom lag luam tseem ceeb. Nrog rau cov khoom lag luam ntawm txhua tus txheej txheem, xws li kev txhaj tshuaj yas, yas, thiab lwm yam. Yas yog ib hom khoom siv hluavtaws polymer nrog plasticity.
1. Qhov hnyav ntawm cov khoom yas:
Cov khoom ntim X cov khoom siv ntom ntom = cov khoom hnyav (khoom lag luam thaj chaw X cov khoom lag luam X khoom siv ceev xaj khoom = qhov hnyav khoom) Ua ke nrog cov ntom ntawm cov plastics sib txawv, qhov hnyav kuj tseem sib txawv.
2. Qhov ntsiab lus dav dav ntawm cov yas yog hais txog cov khoom siv nrog cov cwj pwm coj. Lub npe hu ua plasticity yog hais txog cov deformation uas tshwm sim thaum siv sab nraud quab yuam. Tom qab lub zog sab nraud tau tso tseg, nws tseem tuaj yeem tswj lub xeev thaum lub zog siv. Cov txheej txheem elastic thaus yas yog nruab nrab ntawm cov roj hmab thiab fiber, thiab nws tuaj yeem deform rau qee yam thaum raug quab yuam. Cov yas mos yog ze rau roj hmab, thiab cov yas tawv yog ze rau fiber ntau. Cov ntsiab lus nqaim yas yog hais txog cob dej (lossis ncaj qha polymerization ntawm cov monomers thaum lub sijhawm ua) ua cov khoom tseem ceeb, thiab cov khoom sib ntxiv xws li cov tshuab yas, cov tub lim, cov roj av, cov xim ua cov ntu pabcuam, uas tuaj yeem ntws-pwm thaum ua cov khoom s. Yas yog hluavtaws polymer cov khoom sib txuas uas tuaj yeem hloov pauv ywj pheej. Yas yog cov khoom siv uas cov tshuaj sib tov los ntawm polymerization lossis cov hws tiv thaiv siv cov monomer raw cov ntaub ntawv.
3. Resin: Khoom cua tawv yog qhov tseem ceeb ntawm cov yas, thiab nws cov ntsiab lus hauv cov yas yog feem ntau 40% txog 100%. Vim tias cov ntsiab lus loj, thiab cov xwm ntawm cov resin feem ntau txiav txim siab qhov xwm txheej ntawm cov yas, tib neeg feem ntau xav tias kev ua cov yas raws li cov lus ua rau cov yas. Piv txwv li, polyvinyl chloride resin yog sib xyaw nrog polyvinyl chloride yas, phenolic resin yog sib xyaw nrog phenolic yas. Qhov tseeb, cov yas thiab yas yog ob lub tswv yim sib txawv. Resin yog qhov ua tiav ntawm cov nkauj xwb polymer uas tsis yog tsuas yog siv los ua cov plastics, tab sis kuj yog cov khoom siv raw rau cov ntaub, nplaum thiab cov khoom hluavtaws. Ntxiv rau qhov kev faib ua feem me me ntawm cov yas uas muaj 100% resin, feem ntau ntawm cov yas, ntxiv rau qhov tseem ceeb tivthaiv resin, kuj yuav tsum tau ntxiv lwm yam tshuaj.
4. Plasticizer: Plasticizer tuaj yeem nce plasticity thiab softness ntawm yas, txo brittleness, thiab ua cov yas yooj yim rau txheej txheem. Plasticizers feem ntau yog kub siab ua cov organic sib txuas uas ua tsis zoo nrog cov tawv, tsis muaj tshuaj lom, tsis muaj ntxhiab, thiab ruaj khov rau lub teeb thiab kub. Cov feem ntau siv yog phthalates. Piv txwv, hauv kev tsim cov tshuaj polyvinyl chloride plastics, yog tias muaj cov yas ntau ntxiv rau, cov mos mos polyvinyl chloride plastics tuaj yeem tau txais; yog tias tus nqi ntawm cov yas tsis ntxiv lossis tsawg dua, txoj kev txhav ntawm cov tshuaj polyvinyl chloride plastics tuaj yeem tau txais.
