Xim tsis sib xws / Xim Streaking
Ua rau: Cov xim tsis zoo dispersion, tsis txaus sib xws nrog PVC resin, los yog tsis sib xws plasticizing kub thaum ua.
Cov kev daws teeb meem: Xaiv cov xim uas muaj cov dispersibility siab lossis siv cov dispersants tshwj xeeb; nce kev sib xyaw kom nrawm thiab lub sijhawm kom ntseeg tau tias cov txheej txheem ntawm cov resin los ntawm cov xim; kho extrusion / txhaj molding kub los xyuas kom meej plasticization ntawm PVC.
Poor Migration Resistance
Ua rau: Tsis muaj zog molecular polarity ntawm cov xim, ua rau nag lossis daus thiab tsiv teb tsaws ntawm cov khoom PVC.
Cov kev daws teeb meem: Nyiam cov xim tsis muaj organic lossis kev tsiv teb tsaws -cov xim tsis muaj zog; tswj cov xim xim kom tsis txhob muaj ntau dhau; siv cov stabilizers los txo kev sib cuam tshuam ntawm plasticizers thiab pigments.
Huab cua tsis txaus (Fading, Chalking)
Ua rau: Tsis zoo UV thiab kev laus tiv thaiv ntawm cov xim, ua rau nws tsis haum rau cov khoom siv sab nraum zoov PVC.
Cov kev daws teeb meem: Xaiv huab cua- tiv taus qib pigments (piv txwv li, titanium dioxide, hlau oxide series); ntxiv UV absorbers thiab antioxidants; txo qhov kev faib ua feem ntawm pigments nquag mus decomposition.
Kev ua haujlwm tsis zoo (Discoloration, decomposition)
Ua rau: Cov xim tsis tuaj yeem tiv taus qhov kub siab ntawm PVC ua los yog reacts chemically nrog stabilizers.
Cov kev daws teeb meem: Xaiv qhov siab -kub- cov xim tiv taus (nrog rau qhov kub tsis kam kub siab tshaj lossis sib npaug li 200 degree); kuaj qhov sib raug ntawm cov xim thiab cov stabilizers kom tsis txhob muaj kua qaub- cov tshuaj tiv thaiv puag; txo qhov kub thiab txias ua haujlwm los yog txo kom siab -lub sijhawm nyob hauv qhov kub.
