Muindasitiri yependi, kugadzikana uye rheology yemuvara paste yakakosha. Nekudaro, panguva yekuchengetera uye kushandiswa, iyo paste yemavara inowanzova nezvinetso zvakaita sekukora uye agglomeration, izvo zvinokanganisa maitiro ekuvaka uye kunaka kwekuputira.Hydroxyethyl cellulose (HEC), seyakajairwa mvura-soluble polymer thickener, inoita basa rakakosha mukugadzira pendi. Inogona kunyatso kuvandudza rheological zvimiro zveruvara paste, kudzivirira agglomeration, uye kugadzirisa kuchengetedza kugadzikana.
1. Zvikonzero zvekukora uye agglomeration yepende yemavara paste
Iko kukora uye kuunganidzwa kwepende yemavara paste kunowanzo hukama kune zvinotevera zvinhu:
Kusagadzikana pigment dispersion: Iyo pigment particles mune yeruvara paste inogona kuyerera uye kugadzikana panguva yekuchengetera, zvichikonzera kuwandisa kwenzvimbo uye agglomeration.
Evaporation yemvura muhurongwa: Panguva yekuchengetedza, kubuda kwechikamu chemvura kuchaita kuti viscosity yemuvara paste iwedzere, uye kunyange kuumba nyaya yakaoma pamusoro.
Kusapindirana pakati pezvinowedzera: Zvimwe zvakakora, zvinoparadzanisa kana zvimwe zvinowedzera zvinogona kuita kune mumwe nemumwe, zvichikanganisa rheological zvimiro zveruvara paste, zvichikonzera kuwedzera kwakashata viscosity kana kuumbwa kwe flocculent.
Mhedzisiro yesimba rekugera: Yenguva refu mekiniki inomutsa kana kupomba inogona kukonzera kuparadzwa kwepolymer cheni chimiro muhurongwa, kuderedza kuyerera kwemavara paste, uye kuita kuti iwedzere kuona kana kuungana.
2. Maitiro ekuita kwehydroxyethyl cellulose
Hydroxyethyl cellulose (HEC) isiri-ionic cellulose inobva kune yakanaka kukora, rheological kugadzirisa kugona uye kupararira kugadzikana. Iyo huru nzira yekuita mupende yemavara paste inosanganisira:
Kuwedzera uye rheological gadziriso: HEC inogona kusanganisa nemamorekuru emvura kuburikidza nehydrogen bonding kuti iite yakagadzikana hydration layer, kuwedzera viscosity yehurongwa, kudzivirira pigment particles kubva kuagglomerating uye kugadzirisa, uye ive nechokwadi chekuti iyo ruvara paste inochengetedza mvura yakanaka panguva yekumira kana kuvaka.
Yakagadzika dispersion system: HEC ine yakanaka pamusoro pekuita, inogona kupfekedza pigment zvimedu, kuwedzera dispersibility yavo muchikamu chemvura, kudzivirira kusangana pakati pezvimedu, uye nekudaro kuderedza flocculation uye agglomeration.
Anti-water evaporation: HEC inogona kuumba imwe dura rekudzivirira, inonoke chiyero chekubuda kwemvura, kudzivirira iyo ruvara paste kubva mukukora nekuda kwekurasikirwa kwemvura, uye kuwedzera nguva yekuchengetedza.
Shear kuramba: HEC inopa iyo pendi yakanaka thixotropy, inoderedza viscosity pasi pesimba rakakura rekugera, inofambisa kuvaka, uye inogona kukurumidza kudzoreredza viscosity pasi yakaderera shear simba, kuvandudza pendi's anti-sagging performance.
3. Zvakanakira hydroxyethyl cellulose mupende ruvara paste
Kuwedzera hydroxyethyl cellulose kune pendi color paste system ine zvinotevera zvakanakira:
Kuvandudza kugadzikana kwekuchengetedza kwemuvara wepaste: HEC inogona kudzivirira zvinobudirira pigment sedimentation uye agglomeration, kuve nechokwadi chekuti ruvara rwemavara runochengetedza yunifomu yekuyerera mushure mekuchengetedza kwenguva refu.
Kuvandudza mashandiro ekuvaka: HEC inopa iyo ruvara paste yakanakisa rheological zvivakwa, zvichiita kuti zvive nyore kubhurasha, kukungurutsa kana kupfapfaidza panguva yekuvaka, kuvandudza kuchinjika kwependi.
Kuvandudza kudzivirira kwemvura: HEC inogona kuderedza kushanduka kwe viscosity kunokonzerwa nekubuda kwemvura, kuitira kuti ruvara rwemavara rugone kuchengetedza kugadzikana kwakanaka pasi pemamiriro akasiyana ezvakatipoteredza.
Kubatana kwakasimba: HEC i-non-ionic thickener, iyo ine kuwirirana kwakanaka nevakawanda vanoparadzanisa, wetting agents nezvimwe zvinowedzera, uye hazvizokonzeri kusagadzikana mukugadzirisa maitiro.
Kuchengetedzwa kwezvakatipoteredza uye chengetedzo: HEC inotorwa kubva kune yakasikwa cellulose, inosangana nezvinodiwa zvekuchengetedza kwezvakatipoteredza, haiburitse zvinhu zvinokuvadza, uye inopindirana neyakasvibira uye kuchengetedzwa kwezvakatipoteredza kusimudzira maitiro emvura-based coatings.
4. Kushandiswa uye mazano ehydroxyethyl cellulose
Kuti uite zvirinani basa reHEC, zvinotevera mapoinzi anofanirwa kucherechedzwa kana uchiashandisa mucoating color paste formula:
Kutonga kunonzwisisika kwehuwandu hwekuwedzera: Nhamba yeHEC inowanzova pakati pe0.2% -1.0%. Iyo chaiyo chiyero chekushandisa inoda kugadziridzwa zvinoenderana nezvinodiwa zveiyo coating system kudzivirira yakawandisa viscosity uye kukanganisa basa rekuvaka.
Pre-dissolution process: HEC inofanira kuparadzirwa uye kunyungudutswa mumvura kutanga, uye yozowedzerwa kune iyo color paste system mushure mekugadzira yunifomu mhinduro kuti ive nechokwadi chekuti inobata zvizere kukora uye kuparadzira mhedzisiro.
Shandisa pamwe nezvimwe zvinowedzera: Inogona kuenzaniswa zvine mutsindo nevanoparadzira, vanonyorovesa vamiririri, nezvimwewo kuvandudza kupararira kugadzikana kwepigment uye optimize coating performance.
Dzivisa tembiricha mhedzisiro: Iyo solubility yeHEC inokanganiswa zvakanyanya nekushisa. Inokurudzirwa kuinyungudutsa pane tembiricha yakakodzera (25-50 ℃) kudzivirira kusangana kana kusakwana kunyungudika.
Hydroxyethyl celluloseine kukosha kwekushandisa kwakakosha mupendi color paste system. Inogona kunyatso kugadzirisa matambudziko eruvara paste thickening uye agglomeration, uye kugadzirisa kuchengetedza kugadzikana uye kuita kwekuvaka. Kuwedzera kwayo, kupararira kugadzikana uye kushorwa kwekubuda kwemvura kunoita kuti ive chinhu chakakosha chekuwedzera kwependi yemvura. Mumashandisirwo anoshanda, gadziriso inonzwisisika yeHEC dosage uye nzira yekuwedzera inogona kukwidziridza mabhenefiti ayo uye kugadzirisa huwandu hwese hwepende. Nekuvandudzwa kwependi yemvura-yakavakirwa zvakatipoteredza, tarisiro yekushandiswa kweHEC ichave yakakura.
Nguva yekutumira: Kubvumbi-09-2025