litaba

Kaha viscosity ea resin e thehiloeng metsing e tlaase haholo, e ke ke ea finyella litlhoko tsa polokelo le ts'ebetso ea kaho ea ho roala, kahoo hoa hlokahala ho sebelisa thickener e loketseng ho lokisa viscosity ea ho roala metsi ho ea boemong bo nepahetseng.

Ho na le mefuta e mengata ea li-thickeners.Ha u khetha li-thickeners, ntle le ts'ebetso ea tsona e matla le taolo ea rheology ea ho roala, lintlha tse ling li lokela ho nahanoa e le ho etsa hore seaparo se be le ts'ebetso e ntle ka ho fetisisa ea kaho, ponahalo e ntle ka ho fetisisa ea filimi le bophelo bo bolelele ba ts'ebeletso.

Khetho ea mefuta e teteaneng e itšetlehile haholo ka tlhokahalo le boemo ba sebele ba ho etsoa.

Ha u khetha le ho sebelisa li-thickeners, tsena ke tsa bohlokoa.

1. Boima bo phahameng ba limolek'hule HEC e na le tekanyo e kholo ea ho ts'oaroa ha e bapisoa le boima bo tlaase ba limolek'hule 'me e bonts'a katleho e kholo ea ho teteana nakong ea polokelo.'Me ha sekhahla sa ho kuta se ntse se eketseha, boemo ba ho pota-pota boa senyeha, ha lebelo le leholo la ho kuta, phello ea boima ba molek'hule e fokotseha ka viscosity.Ena thickening mochine ha ho letho le ho se etsa le thepa motheo, pigments le additives sebelisoa, feela lokela ho khetha le tokelo ya molek'hule boima ba selulose le ho lokisa mahloriso ea thickener ka fumana viscosity e nepahetseng, 'me kahoo ho pharaletseng sebelisoa.

2.HEUR thickener ke viscous aqueous solution e nang le diol kapa diol ether e le co-solvent, e nang le litaba tse tiileng tsa 20% ~ 40%.Karolo ea co-solvent ke ho thibela ho khomarela, ho seng joalo li-thickeners tse joalo li boemong ba gel sebakeng se le seng.Ka nako e ts'oanang, boteng ba solvent bo ka thibela sehlahisoa ho tloha serame, empa se tlameha ho futhumala mariha pele se sebelisoa.

3. Lihlahisoa tse tlaase, tse nang le viscosity e tlaase li bonolo ho lahla 'me li ka tsamaisoa le ho bolokoa ka bongata.Ka hona, li-thickeners tse ling tsa HOUR li na le litaba tse fapaneng tse tiileng tsa phepelo e tšoanang ea sehlahisoa.Li-co-solvent content tsa li-thickeners tse tlaase tsa viscosity li phahame, 'me ponahalo ea bohareng ba pente e tla fokotseha hanyenyane ha e sebelisoa, e ka fokotsoang ka ho fokotsa co-solvent e kentsoeng sebakeng se seng ha ho etsoa.

4. Tlas'a maemo a loketseng a ho kopanya, HEUR e tlaase-viscosity e ka ekeletsoa ka ho toba ho lipente tsa latex.Ha u sebelisa lihlahisoa tse phahameng tsa viscosity, thickener e hloka ho hlapolloa ka motsoako oa metsi le co-solvent pele e ka eketsoa.Haeba o eketsa metsi ho hlapolla "thickener" ka ho toba, e tla fokotsa khatello ea "co-solvent" ea pele ho sehlahisoa, e leng se tla eketsa ho khomarela le ho etsa hore viscosity e phahame.

5. Ho eketsa thickener ho tanka e kopanyang e lokela ho ba e tsitsitseng le e liehang, 'me e lokela ho behoa haufi le tanka ea lebota.Lebelo la ho eketsa ha lea lokela ho ba kapele hoo motenya o lulang holim'a mokelikeli, empa o lokela ho huleloa ka har'a mokelikeli ebe o pota-potiloe ho pota-potile molamu o susumetsang, ho seng joalo setenya se ke ke sa tsoakana hantle kapa setenya se tla teteaneng haholo. kapa ho phaphamala ka lebaka la bongata bo bongata ba lehae.

6. HEUR thickener e kenngoa tanka ea ho kopanya pente ka mor'a likarolo tse ling tsa metsi le pele ho emulsion, e le ho etsa bonnete ba hore ho na le khanya e ngata.

7. Li-thickeners tsa HASE li kenngoa ka ho toba ho pente ka mokhoa oa emulsion ha ho etsoa lipente tsa emulsion ntle le dilution pele kapa pele ho neutralization.E ka eketsoa e le karolo ea ho qetela mokhahlelong oa ho kopanya, karolong ea ho hasana ha pigment, kapa e le karolo ea pele ea ho kopanya.

8. Kaha HASE ke emulsion e phahameng ea acid, ka mor'a ho eketsa, haeba ho na le alkali ka pente ea emulsion, e tla hlōlisana le alkali ena.Ka hona, ho hlokahala ho eketsa emulsion ea HASE thickener butle-butle le ka mokhoa o tsitsitseng, le ho hlohlelletsa hantle, ho seng joalo, e tla etsa hore tsamaiso ea pigment e qhalakane kapa emulsion binder ho se tsitse ha sebaka, 'me e qetellang e tsitsisoa ke sehlopha se se nang lehlakore.

9. Alkali e ka ekeletsoa pele kapa ka mor'a hore ho eketsoe moemeli oa thickening.Molemo oa ho eketsa pele ke ho etsa bonnete ba hore ha ho ho se tsitse ha sebaka sa ho hasana ha pigment kapa emulsion binder ho tla bakoa ke hore motenya o tšoara alkali ho tloha holim'a pigment kapa binder.Molemo oa ho eketsa alkali ka mor'a moo ke hore likaroloana tse teteaneng li qhalakanngoa hantle pele li ruruha kapa li qhibiliha ke alkali, ho thibela ho teteka ha sebaka kapa ho kopanya, ho itšetlehile ka ho hlophisoa, lisebelisoa le mokhoa oa ho etsa tlhahiso.Mokhoa o bolokehileng ka ho fetisisa ke ho hlapolla setenya sa HASE ka metsi pele ebe o se fokotsa ka alkali esale pele.

10. HASE thickener e qala ho ruruha ka pH ea hoo e ka bang 6, 'me katleho e kholoanyane e qala ho bapala ka ho feletseng ka pH ea 7 ho ea ho 8. Ho fetola pH ea pente ea latex ho ea holimo ho 8 ho ka boloka pH ea pente ea latex e fokotseha ka tlase ho 8. , kahoo ho netefatsa botsitso ba viscosity.