Cov nyhuv ntawm cov dej-resistant tus neeg sawv cev ntawm cov khoom ntawm txheej thiab coated ntawv

Nrog rau kev loj hlob sai ntawm daim ntawv kev lag luam, tshwj xeeb tshaj yog cov ntawv coated tau tsim sai heev, kev lag luam luam ntawv ntawm cov ntawv coated ntawv yuav tsum tau nce siab dua. Txhawm rau kom ntseeg tau tias cov ntawv luam tawm zoo, qhov saum npoo ntawm cov ntawv coated yuav tsum muaj peev xwm tiv taus kev sib txhuam ntub dej. Kev sib txhuam ntub dej yog hais txog qib ntawm kev puas tsuaj rau ntawm daim ntawv tom qab qee qhov ntawm daim ntawv thiab cov duab los qhia tau muaj kev sib txhuam ntub dej hauv qee qhov siab, uas qhia txog lub peev xwm ntawm qhov chaw ntawm daim ntawv kom tsis txhob puas los ntawm kev sib txhuam ntub dej.

Thiab rau cov ntawv tsis muaj dej tsis zoo nrog cov kev xav tau tshwj xeeb, txhawm rau ua kom nws tau txais lub peev xwm ntawm qhov dej tsis zoo thiab dej tsis kam, hauv cov txheej txheem tsim cov ntawv, ntxiv rau cov txheej txheem sizing hauv tus neeg sawv cev sizing thiab tus neeg saib xyuas qhov chaw, qhov cuam tshuam sai tshaj plaws yog ntxiv cov dej tsis haum rau hauv txheej txheej txheej txheej txheej txheej txheej kom tau txais cov dej zoo tiv thaiv kev ua haujlwm.

Nyob rau tib lub sijhawm, raws li kev txiav txim siab ntawm kev nyab xeeb thiab kev tiv thaiv ib puag ncig, lub teb chaws yuav tsum muaj cov ntawv ntim khoom noj thiab cov ntawv hauv tsev tau dhau los ua nruj dua, thiab tam sim no ntau dua yog kev siv polyamide polyurea formaldehyde resin (PAPU) cov tshuaj tua dej. PAPU yog siv dav, vim tias nws tsis muaj cov formaldehyde dawb, thiab nws ceev ceev, nws ua haujlwm thaum nws tawm ntawm lub tshuab, thiab nws tuaj yeem txhim kho qhov hloov pauv ntawm cov ntawv coated hauv txheej txheem luam ntawv.

PAPU muaj daim ntawv thov muaj zog rau pH tus nqi, thiab cov viscosity ntawm PAPU ntxiv rau cov xim yog ruaj khov thiab kho ceev ceev. PAPU molecular saw muaj chloroethanol pab pawg thiab polyamine pawg ob pawg ua haujlwm, ntawm cov chloroethanol pab pawg thiab cov xim pleev xim tsim cov tshuaj sib txuas, pawg polyamine thiab cov xim nplaum sib xyaw ua ke los ua ionic daim ntawv cog lus, kev sib txuas sib txuas los ua ib qho kev sib txuas ntawm cov yeeb yaj kiab kho, uas yog lub hauv paus tseem ceeb ntawm PAPU dej tsis kam, tab sis kuj yog cov txheej txheem dej ua haujlwm.

Hauv kev siv tiag tiag, PAPU tuaj yeem tsis tsuas yog tsim cov tshuaj tiv thaiv nrog cov hmoov txhuv nplej siab coated, tab sis kuj tsim cov ionic bonds nrog styrene butadiene latex, thiab cov ntub dej sib txhuam ntawm cov txheej yog nce. Tsis tas li ntawd, cov khoom tsis muaj zog cationic ntawm PAPU dej resistant tus neeg sawv cev kuj tuaj yeem tsim micro-flocculation nrog anions hauv txheej, txhim kho puffiness, porosity thiab permeability ntawm txheej txheej, thiab txhim kho kev luam ntawv ntawm cov ntawv tiav.

Cov cuab yeej Rheological yog qhov taw qhia tseem ceeb ntawm cov xim, PAPU hom dej resistant tus neeg sawv cev tuaj yeem ua kom cov viscosity ntawm cov xim, ntxiv PAPU hom dej resistant tus neeg saib xyuas tom qab cov dej poob nqi ntawm cov xim yog txo, dej tuav tau zoo dua. PAPU hom dej resistant tus neeg sawv cev yog tsim rau kev npaj cov xim viscosity siab, thiab cov dej tuav cov xim zoo dua.