Latex Paint cakude ne na pigments, filler dispersions da polymer dispersions, kuma Additives dole ne a yi amfani da su daidaita danko sabõda haka, yana da rheological Properties da ake bukata ga kowane mataki na samarwa, ajiya da kuma gini.Irin waɗannan additives ana kiran su daɗaɗɗen, wanda zai iya ƙara danko na sutura da inganta rheological Properties na coatings, don haka su ake kira rheological thickeners.
Abin da ke biyo baya kawai yana gabatar da mahimman halayen masu kauri na cellulose da aka saba amfani da su da aikace-aikacen su a cikin fenti na latex.
Abubuwan cellulosic waɗanda za a iya amfani da su a cikin sutura sun haɗa da methyl cellulose, hydroxyethyl cellulose, da hydroxypropyl methyl cellulose.Babban abin da ke tattare da kauri na cellulose shi ne cewa tasirin kauri yana da ban mamaki, kuma yana iya ba fenti wani tasiri na riƙewar ruwa, wanda zai iya jinkirta lokacin bushewa na fenti zuwa wani ɗan lokaci, sannan kuma ya sa fenti ya sami wani thixotropy. hana fenti daga bushewa.Hazo da rarrabuwa a lokacin ajiya, duk da haka, irin waɗannan masu kauri suma suna da lahani na rashin daidaituwa na fenti, musamman lokacin amfani da ma'aunin danko.
Cellulose abu ne mai gina jiki don ƙananan ƙwayoyin cuta, don haka matakan anti-mildew ya kamata a ƙarfafa lokacin amfani da shi.Cellulosic thickeners iya kawai thickeners na ruwa lokaci, amma ba su da wani thickening sakamako a kan sauran aka gyara a cikin ruwa tushen fenti, kuma ba za su iya haifar da gagarumin hulda tsakanin pigment da emulsion barbashi a cikin fenti, don haka ba za su iya daidaita rheology na Paint. , Gabaɗaya, zai iya ƙara danko na rufi kawai a ƙananan ƙananan ƙananan ƙima (wanda aka fi sani da KU viscosity).
1. Hydroxyethyl cellulose
Bayani dalla-dalla da samfuran samfuran hydroxyethyl cellulose an bambanta musamman bisa ga matakin maye gurbin da danko.Baya ga bambance-bambance a cikin danko, ana iya raba nau'in hydroxyethyl cellulose zuwa nau'in solubility na al'ada, nau'in watsawa mai sauri da yanayin kwanciyar hankali na halitta ta hanyar gyare-gyare a cikin tsarin samarwa.Dangane da hanyar da ake amfani da ita, ana iya ƙara hydroxyethyl cellulose a matakai daban-daban a cikin tsarin samar da sutura.Za'a iya ƙara nau'in watsawa mai sauri kai tsaye a cikin nau'i na busassun foda, amma ƙimar pH na tsarin kafin ƙarawa ya kamata ya zama ƙasa da 7, musamman saboda hydroxyethyl cellulose yana narkewa a hankali a ƙananan ƙimar pH, kuma akwai isasshen lokaci don ruwa don kutsawa cikin cikin barbashi , sa'an nan kuma ƙara ƙimar pH don sanya shi narke da sauri.Hakanan za'a iya amfani da matakan da suka dace don shirya wani ƙwayar manne da ƙara shi zuwa tsarin fenti.
2. Hydroxypropyl Methyl Cellulose
A thickening sakamako na hydroxypropyl methylcellulose ne m guda da na hydroxyethylcellulose, wato, don ƙara danko na shafi a low da matsakaici karfi rates.Hydroxypropyl methylcellulose yana da juriya ga lalatawar enzymatic, amma ruwa mai narkewa ba shi da kyau kamar na hydroxyethyl cellulose, kuma yana da lahani na gelling lokacin zafi.Don hydroxypropyl methylcellulose da aka yi masa magani, ana iya ƙara shi kai tsaye a cikin ruwa lokacin amfani da shi, bayan motsawa da tarwatsawa, ƙara abubuwan alkaline kamar ruwan ammonia, daidaita ƙimar pH zuwa 8-9, kuma motsawa har sai an narkar da shi sosai.Ga hydroxypropyl methylcellulose ba tare da maganin saman ba, ana iya jika shi kuma a busa shi da ruwan zafi sama da 85 ° C kafin amfani da shi, sannan a sanyaya shi zuwa dakin da zafin jiki, sannan a jujjuya shi da ruwan sanyi ko ruwan kankara don narkewa sosai.
3. Methyl cellulose
Methylcellulose yana da irin wannan kaddarorin zuwa hydroxypropylmethylcellulose, amma ba shi da kwanciyar hankali a cikin danko da zafin jiki.
Hydroxyethyl cellulose ita ce mafi ko'ina da ake amfani da ita a cikin fenti na latex, kuma ana amfani da ita a cikin manyan fenti na latex masu girma, matsakaita da ƙananan sa da kuma kauri na gina fenti.Yadu a yi amfani da thickening na talakawa latex Paint, launin toka alli foda latex Paint, da dai sauransu Na biyu shi ne hydroxypropyl methylcellulose, wanda kuma ana amfani da a wani adadin saboda gabatarwa na masana'antun.Methyl cellulose da wuya a yi amfani da shi a cikin fenti na latex, amma ana amfani dashi sosai a cikin foda na ciki da na bangon bangon waje saboda rushewar sa nan take da kuma riƙe ruwa mai kyau.High-danko methyl cellulose iya ba da putty da fice thixotropy da ruwa riƙewa, sa shi da kyau scraping Properties.
Lokacin aikawa: Janairu-03-2023