Makobvu ependi yelatex anofanirwa kuve nekuenderana kwakanaka nelatex polymer komisheni, zvikasadaro pachava nekadiki diki yekugadzirwa mufirimu yekuputira, uye isingachinjiki particle aggregation ichaitika, zvichikonzera kuderera kwe viscosity uye coarser particle size.Thickeners achachinja kubhadharisa emulsion.Semuenzaniso, cationic thickeners ichava nemhedzisiro isingadzoke paanionic emulsifiers uye kukonzera demulsification.Yakanaka latex pendi thickener inofanirwa kunge iine zvinotevera zvivakwa:
1. Low dosage uye yakanaka viscosity
2. Kugadzikana kwakanaka kwekuchengetedza, hakuzoderedze viscosity nekuda kwekuita kwema enzymes, uye haizodzikisi viscosity nekuda kwekushanduka kwekushisa uye pH kukosha.
3. Kuchengetwa kwemvura kwakanaka, hapana mabhubhu emhepo akajeka
4. Hapana mhedzisiro yependi firimu zvinhu senge scrub resistance, gloss, kuhwanda simba uye kudzivirira mvura.
5. Hapana flocculation ye pigment
Iyo thickening 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.
Mukugadzira latex pendi, hydroxyethyl cellulose (HEC) inoshandiswa seanoparadzira, thickener uye pigment inomisa mumiririri kudzikamisa viscosity yechigadzirwa, kuderedza agglomeration, kuita kuti firimu repende rive rakatsetseka uye rakatsetseka, uye 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 kubhurasha, kutenderedza, kuzadza, kupfapfaidza uye dzimwe nzira dzekuvaka kune zvakanakira basa rekuchengetedza, zvisiri nyore kujekesa, sag, uye kushoma kupuruzira.HEC ine yakanakisa kukura kwemavara.Iyo ine yakanakisa miscibility kune akawanda mavara uye mabhainda, izvo zvinoita kuti latex pendi ive yakanakisa ruvara kuenderana uye kugadzikana.Yakasiyana-siyana yekushandiswa mukuumbwa, isiri-ionic ether.Naizvozvo, inogona kushandiswa muhupamhi pH renji (2 ~ 12), uye inogona kusanganiswa nezvikamu zvakajairika latex pendi senge reactive pigment, additives, soluble salts kana electrolytes.
Hapana chakaipa chinokanganisa pafirimu yekuputira, nokuti iyo HEC yemvura inogadzirisa ine mvura yakajeka pamusoro pekunetsana kwemaitiro, hazvisi nyore kupupa panguva yekugadzira uye kuvaka, uye tsika yemakomba emakomo uye pinholes zvishoma.
Kugadzikana kwakanaka kwekuchengetedza.Munguva yekuchengetedza kwenguva refu, kupararira uye kumiswa kwe pigment kunogona kuchengetedzwa, uye hapana dambudziko rekuyangarara ruvara uye kuputika.Pane zvishoma mvura yakatsetseka pamusoro pepende, uye kana tembiricha yekuchengetedza ichichinja zvakanyanya.Viscosity yaro ichiri kugadzikana.
HEC inogona kuwedzera kukosha kwePVC (pigment volume concentration) yakasimba kuumbwa kusvika ku50-60%.Uye zvakare, iyo yekumusoro yekuputira thickener yemvura-yakavakirwa pendi inogona zvakare kushandisa HEC.
Parizvino, iwo thickeners anoshandiswa mudzimba svikiro uye yepamusoro-giredhi latex pendi vari kunze HEC uye acrylic polymer (kusanganisira polyacrylate, homopolymer kana copolymer emulsion thickeners of acrylic asidhi uye methacrylic asidhi) thickeners.
Hydroxyethyl cellulose inogona kushandiswa
1. Sezvinoparadzira kana kudzivirira glue
Kazhinji, HEC ine viscosity ye10-30mPaS inoshandiswa.Iyo HEC inogona kushandiswa kusvika ku300mPa · S ichava nekupararira kuri nani kana ikashandiswa pamwe chete neanionic kana cationic surfactants.Iyo referensi dosage inowanzo 0.05% yemonomer mass.
2. Semukobvu
Shandisa 15000mPa.Iyo yereferensi dosage ye-high-viscosity HEC pamusoro s ndeye 0.5-1% yehuwandu hwehuwandu hwepende yelatex, uye kukosha kwePVC kunogona kusvika ku60%.Shandisa HEC ingangoita 20Pa,s mupende yelatex, uye kuita kwependi yelatex ndiko kwakanyanya kunaka.Mutengo wekungoshandisa HEC pamusoro pe30O00Pa.s wakaderera.Nekudaro, iyo yekuyera zvimiro zvepende ye latex haina kunaka.Kubva pakuona kwemhando yezvinodiwa uye kuderedza mutengo, zviri nani kushandisa yepakati uye yakakwirira viscosity HEC pamwe chete.
3. Nzira yekusanganisa mupende ye latex
Pamusoro-yakarapwa HEC inogona kuwedzerwa muhupfu hwakaoma kana paste fomu.Iyo yakaoma poda inowedzerwa zvakananga kune pigment grind.Iyo pH panzvimbo yekudya inofanira kuva 7 kana pasi.Alkaline zvikamu zvakadai seYanbian dispersant zvinogona kuwedzerwa mushure mokunge HEC yanyorova uye yakaparadzirwa zvizere.Slurries yakagadzirwa neHEC inofanira kusanganiswa mune slurry isati HEC yava nenguva yakakwana yekunyorovesa uye inobvumira kuwedzera kune isingagoneki.Izvo zvakare zvinokwanisika kugadzirira HEC pulp ine ethylene glycol coalescing agents.
4. Anti-mold yepende ye latex
Mvura-inonyungudika HEC inozoora kana yasangana nema molds ane yakakosha mhedzisiro pa cellulose uye zvinobva zvayo.Hazvina kukwana kuwedzera zvinodzivirira kune pendi chete, zvikamu zvose zvinofanira kunge zvisina enzyme.Mota yekugadzira yependi yelatex inofanirwa kuchengetedzwa yakachena, uye zvese zvinoshandiswa zvinofanirwa kugara zvichiitwa sterilized nemhepo 0.5% formalin kana O.1% mercury solution.
Nguva yekutumira: Zvita-26-2022