Latex pendi musanganiswa we pigment, filler dispersions uye polymer dispersions, uye zvekuwedzera zvinofanirwa kushandiswa kugadzirisa viscosity yayo kuitira kuti ive neiyo rheological properties inodiwa padanho rega rega rekugadzira, kuchengetedza uye kuvaka. Izvi zvinowedzera zvinowanzodaidzwa kunzi thickeners, izvo zvinogona kuwedzera viscosity yejasi uye kugadzirisa rheological zvimiro zvejasi, saka ivo vanonziwo rheological thickeners.
Izvi zvinotevera zvinongozivisa maitiro makuru ezvinowanzo shandiswa cellulose thickeners uye kushandiswa kwavo mulatex pendi.
Cellulosic zvinhu zvinogona kuiswa pakupotera zvinosanganisira methyl cellulose, hydroxyethyl cellulose, uye hydroxypropyl methyl cellulose. Chinhu chikuru che cellulose thickener ndechekuti iyo thickening mhedzisiro inoshamisa, uye inogona kupa iyo pendi imwe nzira yekuchengetedza mvura, iyo inogona kunonoka kuomesa nguva yepende kusvika pamwero wakati, uye zvakare kuita kuti pendi ive neimwe thixotropy, kudzivirira pende kubva pakuoma. Kunaya uye stratification panguva yekuchengetera, zvisinei, makobvu akadaro anewo mhedzisiro yekusagadzikana kwepende, kunyanya kana uchishandisa akakwira-viscosity mamakisi.
Cellulose chinhu chinovaka muviri chemicroorganisms, saka matanho ekurwisa-mildew anofanira kusimbiswa kana achiishandisa. Cellulosic thickeners inogona kungokora chikamu chemvura, asi haina kukora pane zvimwe zvikamu mupendi yemvura, uye haigone kukonzera kudyidzana kwakakosha pakati pepigment uye emulsion particles mupende, saka havakwanise kugadzirisa rheology yepende. , Kazhinji, inogona chete kuwedzera viscosity yejasi pane yakaderera uye yepakati shear mitengo (inowanzo kunzi KU viscosity).
1. Hydroxyethyl cellulose
Izvo zvinotsanangurwa uye modhi zve hydroxyethyl cellulose zvigadzirwa zvinonyanya kusiyaniswa zvichienderana nedhigirii rekutsiva uye viscosity. Pamusoro pemusiyano we viscosity, iyo mhando yehydroxyethyl cellulose inogona kukamurwa kuita yakajairwa solubility mhando, kukurumidza kupararira mhando uye biological kugadzikana mhando kuburikidza nekugadzirisa mukugadzira maitiro. Nezve nzira yekushandiswa ine chekuita, hydroxyethyl cellulose inogona kuwedzerwa pamatanho akasiyana mukuita kwekuputira. Iyo inokurumidza-kuparadzira mhando inogona kuwedzerwa zvakananga muchimiro chehupfu hwakaoma, asi pH kukosha kweiyo system isati yawedzera inofanira kunge iri pasi pe7, kunyanya nekuti hydroxyethyl cellulose inonyungudika zvishoma nezvishoma pane yakaderera pH kukosha, uye pane nguva yakakwana yekuti. mvura kuti ipinde mukati mechikamu, uye wobva wawedzera pH kukosha kuti iite kunyungudika nekukurumidza. Matanho anowirirana anogonawo kushandiswa kugadzirira imwe fungidziro yeglue uye kuwedzera kune iyo pendi system.
2. Hydroxypropyl Methyl Cellulose
Iko kukora kwekuita kwehydroxypropyl methylcellulose kwakangofanana neiyo yehydroxyethylcellulose, ndiko kuti, kuwedzera viscosity yejasi pane yakaderera uye yepakati shear mitengo. Hydroxypropyl methylcellulose inoshingirira kushatisa enzymatic, asi kunyungudika kwayo kwemvura hakuna kunaka seiyo yehydroxyethyl cellulose, uye ine dhizaini yegelling kana ichipisa. Pamusoro-yakagadziriswa hydroxypropyl methylcellulose, inogona kuwedzerwa zvakananga kumvura kana yakashandiswa, mushure mokukurudzira uye kuparadzira, kuwedzera alkaline zvinhu zvakadai seammonia mvura, gadzirisa pH kukosha ku8-9, uye fambisa kusvikira yanyungudutswa zvakakwana. Kune hydroxypropyl methylcellulose pasina kurapwa kwepamusoro, inogona kunyorova uye yakaputirwa nemvura inopisa inopfuura 85 ° C isati yashandiswa, uye yozonyoroveswa kusvika kune tembiricha yekamuri, yozobvongodzwa nemvura inotonhora kana mvura yechando kuti iparadze zvizere.
3. Methyl cellulose
Methylcellulose ine zvinhu zvakafanana kune hydroxypropylmethylcellulose, asi haina kugadzikana mu viscosity pamwe nekushisa.
Hydroxyethyl cellulose ndiyo inonyanya kushandiswa mukobvu mupende yelatex, uye inoshandiswa mupamusoro, yepakati uye yakaderera giredhi latex pendi uye gobvu kuvaka latex pendi. Inoshandiswa zvakanyanya mukukora kwependi yakajairwa latex, grey calcium powder latex paint, etc. Yechipiri ndeye hydroxypropyl methylcellulose, iyo inoshandiswawo mune imwe chiyero nekuda kwekusimudzirwa kwevagadziri. Methyl cellulose haisati yashandiswa mulatex pendi, asi inoshandiswa zvakanyanya muupfu mukati uye kunze kwemadziro putty nekuda kwekunyungudika kwayo nekuchengetwa kwemvura kwakanaka. Yakakwirira-viscosity methyl cellulose inogona kupa iyo putty neyakatanhamara thixotropy uye kuchengetedza mvura, ichiita kuti ive yakanaka yekukwenya zvivakwa.
Nguva yekutumira: Jan-03-2023