Iyo thickener yependi yelatex inofanira kuva nekuenderana kwakanaka ne emulsion polymer compound, zvikasadaro iyo yekuputira firimu ichange iine zvishoma reticulate, uye inobudisa isingagadziriswi particle agglomeration, iyo inoderedza viscosity uye coarsen the particle size. Iyo thickener ichachinja kubhadharisa emulsion. Semuenzaniso, iyo cationic thickener ichava nemhedzisiro isingachinjiki pane anionic emulsifier yekupwanya emulsion. Iyo yakanakira thickener yepende yelatex inofanirwa kunge iine zvinotevera zvivakwa:
1. Low dosage uye yakanaka viscosity
2. Kugadzikana kwakanaka kwekuchengetedza, hapana kuderedzwa kwe viscosity nekuda kwekuita kwema enzymes, uye hapana kuderedzwa kwe viscosity nekuda kwekushanduka kwekushisa uye PH kukosha.
3, kuchengetwa kwemvura kwakanaka, hapana chiri pachena bubble phenomenon
4. Hapana mhedzisiro yezvinhu zvemufirimu senge scrub resistance, gloss, kuhwanda simba uye kuramba mvura.
5. Hapana pigment flocculation
Iyo gobvu tekinoroji yepende ye latex chiyero chakakosha chekuvandudza kunaka kwelatex uye kuderedza mutengo. Hydroxyethyl cellulose ndiyo yakanaka thickener, ine multifunctional mhedzisiro pakukora, kudzikamisa uye rheological kugadziridzwa kwepende yelatex.
Mukugadzirwa kwepende ye latex,hydroxyethyl cellulose (HEC)inoshandiswa seanoparadzira, thickener uye pigment suspending agent kuti agadzikane viscosity yechigadzirwa, kuderedza agglomeration, kuita kuti firimu rependi rive rakatsetseka uye rakatsetseka, uye zvakare kuita kuti pendi yelatex igare yakasimba. Rheology yakanaka, inogona kumira yakasimba kugera simba, uye inogona kupa yakanaka kuenzana, kukwenya kuramba uye pigment kufanana. Panguva imwecheteyo, HEC ine hunyanzvi hwekushanda, uye pendi yelatex yakakora neHEC ine pseudoplasticity, saka nzira dzekuvaka dzakadai sekupuruzira, kukungurutsira, kuzadza, uye kupfapfaidza zvine zvakanakira basa rekuchengetedza, hazvisi nyore kuchenesa uye kusagika, uye kushoma kupuruzira. HEC ine yakanakisa kukura kwemavara. Iyo ine yakanakisa miscibility ine mavara mazhinji uye mabhandi, zvichiita kuti zvikwanise kugadzira latex pendi ine yakanakisa ruvara kuenderana uye kugadzikana. Iko kushandiswa kwakasiyana-siyana kwakashandiswa mukugadzirisa, iyo isiri-ionic ether. Naizvozvo, inogona kushandiswa muhupamhi pH renji (2 ~ 12), uye inogona kusanganiswa nezvikamu zveyakajairwa latex pendi senge reactive pigment, additives, soluble salts kana electrolytes.
Iko hakuna mhedzisiro yakaipa pane yekupfeka firimu. Nekuti iyo HEC aqueous mhinduro ine zviri pachena pamusoro pemvura kushushikana maitiro, hazvisi nyore kupupa panguva yekugadzira uye kuvaka, uye tsika yemakomba emakomo uye mapinho ishoma.
Kugadzikana kwekuchengetedza kwakanaka. Mukuchengetedza kwenguva refu, iyo dispersibility uye kumiswa kwe pigment inogona kuchengetedzwa, uye hapana dambudziko rekuyangarara ruvara uye kuputika. Kana paine mvura shoma yemvura pane pendi uye tembiricha yekuchengetera inoshanduka zvakanyanya. Viscosity yaro ichiri kugadzikana.
HEC inogona kuwedzera kukosha kwePVC (pigment volume concentration) yakasimba kuumbwa kusvika ku50-60%. Mukuwedzera, iyo topcoat thickener yependi-yakavakirwa mvura inogonawo kushandisa HEC.
Parizvino, iwo thickeners anoshandiswa mudzimba yepamusoro-giredhi latex pendi anounzwa kunze HEC uye acrylic polymers (kusanganisira polyacrylates, homopolymer kana copolymer emulsion thickeners ye acrylic acid uye methacrylic acid) thickeners.
Hydroxyethyl cellulose inogona kushandiswa
1. Sezvinoparadzira kana kudzivirira glue
Kazhinji, HEC ine viscosity ye10 kusvika 30 mPaS inoshandiswa. Iyo HEC inosvika 300mPa · S inogona kushandiswa pamwe chete neanionic kana cationic surfactants, uye kuparadzira mhedzisiro kuri nani. Huwandu hwereferensi hunowanzo 0.05% yehuwandu hwemonomer.
2, semukobvu
Shandisa 15000mPa. Iyo yereferensi dosage ye-high-viscosity HEC pamusoro s ndeye 0.5 kusvika 1% yehuwandu hwehuwandu hwe latex coating, uye kukosha kwePVC kunogona kusvika ku60%. Mupendi yelatex, HEC yeanenge 20Pa,s inoshandiswa, uye zvakasiyana-siyana zvepende yelatex ndizvo zvakanakisisa. Mutengo wekungoshandisa HEC pamusoro pe30O00Pa.s wakaderera. Nekudaro, iyo yekuyera uye humwe hunhu hwepende ye latex haina kunaka. Kubva pamaonero emhando yezvinodiwa uye kuderedzwa kwemutengo, zviri nani kushandisa yepakati uye yakakwirira viscosity HEC pamwe chete.
3. Incorporation nzira mu latex pendi
Pamusoro-yakarapwa HEC inogona kuwedzerwa muhupfu hwakaoma kana slurry fomu. Iyo yakaoma poda inowedzerwa zvakananga kune pigment grinding. Iyo pH yenzvimbo yekuwedzera inofanira kunge iri 7 kana kudzika. Alkaline zvikamu zvakadai se dispersants zvinogona kuwedzerwa mushure meHECakanyorova uye akaparadzirwa zvizere. Slurry yakagadzirwa neHEC inofanira kusanganiswa mune slurry isati HEC yava nenguva yakakwana yekunyorovesa uye yakakora kune isingagoneki. HEC slurries inogonawo kugadzirirwa ne glycol-based coalescing agents.
4. Anti-mildew yepende ye latex
Mvura-soluble HEC biodegrades kana yakafumurwa kune molds dzakanangana neselulosi uye zvinobva zvayo. Kuwedzera mapreservatives kupende chete hakuna kukwana, zvese zvinoumba zvinofanirwa kunge zvisina enzyme. Mota dzekugadzira dzependi yelatex dzinofanirwa kuchengetwa dzakachena uye dzakatsvinda, uye zvese zvinoshandiswa zvinofanirwa kugara zvichiitwa sterilized nemhepo 0.5% formalin kana 0.1% mecury solution.
Nguva yekutumira: Kubvumbi-25-2024