Thickener yakajairika uye inonyanya kushandiswa mvura-based additive mumvura-based coatings. Mushure mekuwedzera thickener, inogona kuwedzera viscosity yegadziriro yekuputira, nekudaro ichidzivirira izvo zvakati dense zvinhu mujasi kubva pakugadzirisa. Iko hakuzove nekuderera kwechiitiko nekuda kwe viscosity yepende yakanyanya kutetepa. Kune akawanda marudzi ezvakakora zvigadzirwa, uye marudzi akasiyana ezvigadzirwa ane akasiyana misimboti yekukora kune akasiyana masisitimu ekuputira. Kune dzinenge ina mhando dzeakajairika thickeners: polyurethane thickeners, acrylic thickeners, inorganic thickeners uye thickeners for cellulose thickeners.
1. Kukora nzira ye associative polyurethane thickener
Mamiriro ezvinhu e polyurethane associative thickeners ari lipophilic, hydrophilic uye lipophilic tri-block polymers, ane lipophilic magumo mapoka kumativi ose maviri, kazhinji aliphatic hydrocarbon mapoka, uye mvura-inonyunguduka polyethylene glycol chikamu pakati. Chero bedzi paine huwandu hwakakwana hwekukora muhurongwa, iyo sisitimu inoumba iyo yakazara network chimiro.
Muhurongwa hwemvura, kana huwandu hweiyo thickener yakakura kupfuura yakakosha micelle concentration, mapoka ekupedzisira e lipophilic anobatana kugadzira micelles, uye iyo thickener inoumba network network kuburikidza nekubatana kwema micelles kuwedzera viscosity yehurongwa.
Mune latex system, iyo thickener haigone chete kuumba mubatanidzwa kuburikidza ne lipophilic terminal group micelles, asi zvakanyanya kukosha, iyo lipophilic terminal boka reiyo thickener inoshambadzirwa pamusoro peiyo latex particle. Kana mapoka maviri ekupedzisira lipophilic akashambadzirwa pane akasiyana latex particles, iwo thickener mamorekuru anoumba mabhiriji pakati pezvimedu.
2. Kukora nzira ye polyacrylic asidhi alkali kuzvimba thickener
Polyacrylic acid alkali kuzvimba thickener is a cross-linked copolymer emulsion, iyo copolymer iripo muchimiro cheasidhi uye zvidimbu zvidiki kwazvo, chitarisiko chine mukaka chena, viscosity yakadzikira, uye ine kugadzikana kwakanaka pakudzika pH bonde, uye isinganyunguke. mumvura. Kana alkaline agent yawedzerwa, inoshandura kuita yakajeka uye yakanyanya kupararira kupararira.
Iko kukora mhedzisiro ye polyacrylic asidhi alkali kuzvimba thickener inogadzirwa ne neutralizing the carboxylic acid group ine hydroxide; kana iyo alkali agent yawedzerwa, boka re carboxylic acid risingaite ionized rinobva rashandurwa kuita ionized ammonium carboxylate kana simbi Muchimiro chemunyu, electrostatic repulsion effect inogadzirwa pamwe neanion centre yecopolymer macromolecular chain, kuitira kuti muchinjikwa. -yakabatanidzwa copolymer macromolecular chain inowedzera uye inotambanudza nokukurumidza. Nekuda kwekuparara kwenzvimbo uye kuzvimba, iyo yepakutanga particle inowedzerwa kakawanda uye viscosity inowedzera zvakanyanya. Sezvo zvipingamupinyi zvisingagoni kunyungudutswa, iyo copolymer mumunyu fomu inogona kuonekwa se copolymer dispersion iyo zvidimbu zvakakura zvikuru.
Polyacrylic acid thickeners ine yakanaka kukora mhedzisiro, kukurumidza kukora kukurumidza, uye yakanaka kugadzikana kwebiological, asi inonzwira pH, kushomeka kwemvura, uye kuderera kupenya.
3. Kukora mashandiro einorganic thickeners
Inorganic thickeners inonyanya kusanganisira modified bentonite, attapulgite, etc. Inorganic thickeners ine zvakanakira kusimba kwakasimba, yakanaka thixotropy, yakafara pH range, uye yakanaka kugadzikana. Zvisinei, sezvo bentonite iine inorganic powder ine chiedza chakanaka, inogona kuderedza zvakanyanya kupenya kwepamusoro kwefirimu yekuputira uye kuita senge matting agent. Naizvozvo, kana uchishandisa bentonite mu glossy latex pendi, kutarisisa kunofanirwa kubhadharwa kudzora kuyerwa. Nanotechnology yakaona iyo nanoscale yeinorganic particles, uye zvakare yakapa inorganic thickeners nezvimwe zvitsva zvivakwa.
Iko kukora mashandiro einorganic thickeners kwakaoma. Zvinowanzotendwa kuti kuramba pakati pemhosva dzemukati kunowedzera viscosity yepende. Nekuda kwekusagadzikana kwayo, inokanganisa kupenya uye kujeka kwefirimu repende. Iyo inowanzo shandiswa kuPrimer kana yakakwirira kuvaka pendi.
4. Kukora nzira ye cellulose thickener
Cellulose thickeners ane nhoroondo refu yebudiriro uye zvakare anoshandiswa zvakanyanya makobvu. Zvinoenderana nemaitiro avo mamorekuru, akakamurwa kuita hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, nezvimwewo, iyo inonyanya kushandiswa hydroxyethyl cellulose (HEC).
Iyo yekukora mashandiro e cellulose thickener inonyanya kushandisa iyo hydrophobic main cheni pachimiro chayo kugadzira hydrogen zvisungo nemvura, uye panguva imwechete inopindirana nemamwe mapoka epolar pane chimiro chayo kuvaka matatu-dimensional network chimiro uye kuwedzera rheological vhoriyamu. ye polymer. , chengetedza nzvimbo yakasununguka yekufamba yepolymer, nokudaro kuwedzera viscosity yejasi. Kana simba rekugera rinoshandiswa, iyo matatu-dimensional network inoparadzwa, iyo hydrogen zvisungo pakati pemamorekuru inonyangarika, uye viscosity inoderera. Kana simba rekugera rabviswa, mabhondi ehydrogen anoumbwa zvakare, uye matatu-dimensional network yakagadziriswa zvakare, zvichiita kuti kuve nechokwadi chokuti kuvhara kunogona kuva nezvinhu zvakanaka. rheological properties.
Cellulosic thickeners akapfuma mumapoka ehydroxyl uye zvikamu zvehydrophobic muchimiro chavo. Ivo vane yakakwirira thickening kunyatsoshanda uye havana hanya pH. Nekudaro, nekuda kwekusamira kwavo kwemvura uye kukanganisa kuenzana kwefirimu repende, zviri nyore Kukanganiswa nehutachiona hwehutachiona uye zvimwe zvinokanganisa, cellulose thickeners inonyanya kushandiswa kukora latex pendi.
Mukati mekugadzirira kwekuputira, kusarudzwa kwekukora kunofanirwa kutarisisa zvakanyanya zvinhu zvakawanda, sekuenderana nehurongwa, viscosity, kugadzikana kwekuchengetedza, kuita kwekuvaka, mutengo uye zvimwe zvinhu. Multiple thickeners inogona kusanganiswa uye kushandiswa kupa yakazara kutamba kune zvakanakira yega yega gobvu, uye zvine musoro kudzora mutengo pasi pemamiriro ekuita kunogutsa.
Nguva yekutumira: Mar-02-2023