Zvinotisa pendi dzelatex zvinofanira kunge zvichienderana zvakanaka ne latex polymer compounds, zvikasadaro pachava nehuwandu hushoma hwemagadzirirwo mu coating film, uye kuunganidzwa kwe particles kusingadzoreki kuchaitika, zvichikonzera kudzikira kwe viscosity uye kukura kwe particles kwakasimba. Zvinotisa pendi zvichachinja chaji ye emulsion. Semuenzaniso, cationic thickeners dzichava nemhedzisiro isingadzoreki pa anionic emulsifiers uye zvinokonzera demulsification. Latex pendi thickener yakakodzera inofanira kunge iine zvinotevera:
1. Chipimo chakaderera uye kunaka kwekupenya
2. Kugadzikana kwakanaka kwekuchengetedza, hazvideredzi viscosity nekuda kwekushanda kwema enzymes, uye hazvideredzi viscosity nekuda kwekuchinja kwetembiricha uye pH kukosha
3. Kuchengeta mvura zvakanaka, hapana mabubble emhepo ari pachena
4. Hapana migumisiro yakaipa pahunhu hwependi yakaita sekudzivirira kukwesha, kupenya, simba rekuviga uye kudzivirira mvura
5. Hapana kusanganiswa kwemavara
Tekinoroji yekukora kwependi yelatex inzira yakakosha yekuvandudza mhando yelatex uye kuderedza mitengo. Hydroxyethyl cellulose chinhu chakanakira kukora, chine mabasa akawanda pakukora, kugadzikana uye kugadzirisa rheological yependi yelatex.
Mukugadzirwa kwependi yelatex, hydroxyethyl cellulose (HEC) inoshandiswa semushonga unobvisa ruvara, unosimbisa uye unomisa pigment kuti usimbise viscosity yechigadzirwa, kuderedza agglomeration, kuita kuti pendi iite seyakatsetseka uye yakapfava, uye kuita kuti pendi yelatex igare kwenguva refu. Rheology yakanaka, inogona kutsungirira simba rakawanda rekuchekwa, uye inogona kupa kuenzana kwakanaka, kuramba kukwenya uye kufanana kwepigment. Panguva imwe chete, HEC inoshanda zvakanaka, uye pendi yelatex yakakora neHEC ine pseudoplasticity, saka kukwesha, kuzunguza, kuzadza, kupfapfaidza nedzimwe nzira dzekuvaka zvine zvakanakira zvekuchengetedza basa, hazvisi nyore kubvisa, kudonha, uye kusaswa zvishoma. HEC ine kukura kwakanaka kwemavara. Ine miscibility yakanaka kune akawanda mavara uye ma binders, izvo zvinoita kuti pendi yelatex ive neruvara rwakanaka uye kugadzikana. Inoshandiswa zvakasiyana-siyana mumafomu, i non-ionic ether. Saka, inogona kushandiswa muhuwandu hwakakura hwepH (2 ~ 12), uye inogona kusanganiswa nezvinhu zviri mupendi yelatex zvakaita se reactive pigments, additives, soluble salts kana electrolytes.
Hapana mhedzisiro yakaipa pafirimu rekuputira, nekuti mhinduro yemvura yeHEC ine hunhu hwakajeka hwekumanikidzwa kwemvura pamusoro, haisi nyore kupupuma furo panguva yekugadzira nekuvaka, uye maitiro emakomba emakomo anoputika nepaburi repamusoro haasi madiki.
Kugara zvakanaka kwekuchengetedza. Munguva yekuchengetwa kwenguva refu, ruvara runogona kupararira uye kusungirirwa, uye hapana dambudziko reruvara rwunoyangarara uye kutumbuka. Pane mvura shoma pamusoro pependi, uye kana tembiricha yekuchengetera ichichinja zvakanyanya. Kusviba kwayo kuchiri kugadzikana.
HEC inogona kuwedzera kukosha kwePVC (huwandu hwepigment) kusvika pa50-60%. Pamusoro pezvo, chinhu chinosimbisa pendi ine mvura chinogonawo kushandisa HEC.
Parizvino, zvinogocha zvinoshandiswa mukupenda kwelatex yepakati nepamusoro zvinotengeswa kunze kwenyika neHEC uye acrylic polymer (kusanganisira polyacrylate, homopolymer kana copolymer emulsion thickeners dze acrylic acid uye methacrylic acid).
Hydroxyethyl cellulose inogona kushandiswa
1. Seguruu rinoparadzira kana rinodzivirira
Kazhinji, HEC ine viscosity ye10-30mPaS inoshandiswa. HEC inogona kushandiswa kusvika ku300mPa·S ichave nemhedzisiro iri nani yekupararira kana ikashandiswa pamwe chete neanionic kana cationic surfactants. Chiyero chereferensi chinowanzova 0.05% ye monomer mass.
2. Sechinokora
Shandisa 15000mPa. Chiyero che HEC ine viscosity yakakwira pamusoro pe s i0.5-1% yehuwandu hwese hwependi ye latex, uye kukosha kwePVC kunogona kusvika pa 60%. Shandisa HEC ye 20Pa,s mupendi ye latex, uye mashandiro ependi ye latex ndiwo akanakisa. Mutengo wekushandisa HEC pamusoro pe 30O00Pa.s wakaderera. Zvisinei, hunhu hwekuenzana kwependi ye latex hauna kunaka. Kubva pamaonero ezvinodiwa zvemhando yepamusoro uye kudzikiswa kwemutengo, zviri nani kushandisa HEC yepakati neyakakwira pamwe chete.
3. Nzira yekusanganisa pendi yelatex
HEC yakagadziriswa pamusoro inogona kuwedzerwa muupfu hwakaoma kana muchimiro chekunamira. Upfu hwakaoma hunowedzerwa zvakananga ku pigment grind. pH panzvimbo yekudyisa inofanira kuva 7 kana pasi. Zvikamu zvealkaline zvakaita seYanbian dispersant zvinogona kuwedzerwa mushure mekunge HEC yanyoroveswa uye yapararira zvizere. Madota akagadzirwa neHEC anofanira kusanganiswa muslurry HEC isati yawana nguva yakakwana yekunyorovesa uye kuita kuti ikure kusvika yaoma. Zvinokwanisikawo kugadzira HEC pulp ne ethylene glycol coalescing agents.
4. Pendi yelatex inorwisa kuumbwa
HEC inonyungudika mumvura inoora kana yakabatana nemolds dzine simba rakakosha pa cellulose nezvimwe zvinobva mairi. Hazvina kukwana kuwedzera zvinochengetedza mupendi chete, zvese zvinoumba pendi zvinofanira kunge zvisina ma enzymes. Chinhu chinogadzirwa pendi ye latex chinofanira kucheneswa, uye michina yese inofanira kugara ichicheneswa ne steam 0.5% formalin kana O.1% mercury solution.
Nguva yekutumira: Zvita-26-2022