I-stiffener esekelwe emanzini ayincibiliki emanzini, kodwa inesici esithile sokuqinisa (ayiqukethe ubude be-ionic noma i-molecular chain obufika kumazinga angu-2 ~ 3, indawo enkulu ethile) yezithasiselo eziphilayo. Iyisigaba se -stiffener esekelwe emanzini , esetshenziswa kakhulu ekumbozeni, epulasitikini, erabha, opende nakwezinye izinto zokugcoba eziphilayo, ezinamathelayo nakwezinye izimboni. I-Stiffener iyisigaba samakhemikhali e-organic afakwe i-hydrogen ukuze akhe i-emulsion yamaqembu e-ester (bheka iSithasiselo A), i-stiffener yakhiwa kakhulu yi-stearic acid (i-ester), i-hydroxyl (ikakhulukazi iqembu le-ester), i-hydrogen bonding, i-hydroxyl, i-carboxyl, kanye namaqembu e-amide. I-hydrogen bonding phakathi kwamaqembu e-ester inikeza i-stiffener umphumela wokumunca amanzi noma wokuvuvukala. Ngakho-ke, i-stiffener inganqoba ngempumelelo upende, i-glue ngenxa yokwanda kwezinga lokushisa eliphezulu lesendlalelo se-glue esishwabene, esiqhekekile noma esiqhekekayo kanye nezinye iziphambeko. Inokumelana okuhle kokuguga, ukumelana ne-asidi ne-alkali, kanye nezakhiwo ezinhle zemishini, ukumelana nesimo sezulu, ukumelana nokushisa kanye nokumelana nokubanda.
- Uhlolojikelele
Ngokusho kwesakhiwo sayo, i-stiffener ingahlukaniswa ngezigaba ezimbili: i-oil-soluble kanye ne-water-soluble. I-oil-soluble stiffener isetshenziswa ikakhulukazi ezingubo, amapulasitiki kanye nerabha kanye nezinye izigqoko eziphilayo ukuze kuvinjwe impahla ekuqhumeni, ukuphuka, ukuxebuka nokunye ukukhubazeka ngenxa yokwanda kwezinga lokushisa. I-stiffener encibilikayo emanzini inomphumela wokuthambisa kusisombululo samafutha namanzi, okungeke kwenze upende uqhekeke, kodwa ingxube ye-pigment ayikwazi ukusabela ngokugcwele noma iyenze ibe yi-turbid nezinye iziphambeko. Ngenxa yokuqina komphumela awukhiqizi imikhiqizo (njengohlobo lwe-acrylic acid noma uhlobo lwe-sulfonate ester) noma ayikhiqizi imikhiqizo, ngaleyo ndlela ithuthukise ukuhlakazeka kwe-hardener futhi ikhulise ikhono lokuqina lokuthuthukisa kakhulu ukumelana nokushisa kwayo, isimo sezulu, ukumelana nokubanda kanye nokusebenza okuphansi kwezinga lokushisa. Ngesikhathi esifanayo kunganciphisa inani le-solvents ekugqokeni futhi kunwebe ukuqina okusekelwe emanzini ngesikhathi senqubo yokumisa esidingekayo ukuze kuncishiswe izindleko zokukhiqiza.
- II. Isakhiwo samakhemikhali esiyisisekelo
Ama-Stiffener ngokuvamile akhiwa ama-acetate esters, i-fatty acid esters, i-hydroxy acid esters noma i-alkyl lipids. Iningi le-stiffener linokumuncwa kwamanzi, ngakho-ke i-solvents ephilayo ingahlakazwa ngokuphumelelayo ku-emulsion futhi inciphise i-viscosity yesistimu ye-stiffener, ingasetshenziswa futhi njenge-stabilizer noma i-emulsifier. I-Stiffener nayo inezici ezikhethekile zohlobo, njengalezi: i-solvent-based stiffener esetshenziswa kumapulasitiki, irabha, i-coatings, i-adhesives nezinye izimboni. Izigxivizo ezisekelwe ku-solvent zisetshenziswa kumapende nasezimbotsheni ezinomphumela omuhle wokuqinisa. Uketshezi lusetshenziswa embonini yokudla ukuze kugcinwe ukusebenza kahle. Angancibiliki emanzini, ancibilika kuzincibilikisi zemvelo njengama-acrylates, angahlangana nezincibilikisi eziningi eziphilayo. Ingakhiqiza ukuhlangana kwe-hydrogen ne-asidi ne-alkali, inamandla aqinile e-chelating we-anhydride namanye amandla e-ionic, futhi ingenziwa i-polymerized ngezinhlobo ezahlukene zama-polymers. Inokumelana nesimo sezulu esihle, ukuqina okuphezulu kanye nokumelana nokugqwala.
III. Ukusetshenziswa kwe-stiffener
Ukuxuba: i-stiffener in the mix izovela ukuhlanganisa okuningi, ekuxubeni kanye nenqubo yokugqugquzela ukukhiqiza umkhuba wama-bubbles, nokumiswa okuningi kakhulu. Kuzoholela ekwakhekeni kwefilimu ye-emulsion ebusweni bopende futhi kubangele umphumela omubi wokuqina nezinye izinkinga. Ngakho-ke, ukunakekelwa kufanele kukhokhwe kumthamo we-hardener, inani kufanele lifanele, futhi ingxube akufanele ibe mkhulu kakhulu, ukuze ingahlakazi ngokungalingani okuholela ekuqhumeni, okuthinta ukusetshenziswa komphumela.
Ukuxuba ngesivinini esiphansi: imishini yokuxuba ijubane eliphansi isetshenziselwa ukugcwalisa ukuqina futhi kwakhiwe ingxube yamanzi yokuvumelana okufanayo. Indlela inezinhlobo ezilandelayo: okokuqala engeza ukuhlushwa okuphansi kwe-stearic acid (i-ester), i-hydroxyl, i-hydrogen bonding ne-hydroxyl, bese ixutshwa ne-stearic acid noma i-ester group ukuze wenze ukuqina; noma okubili okuxubene ne-stiffener ngemva kokwengeza inani elifanele lamanzi ukuze alenze libe ne-denatured ngokushisisa.
Uhlobo lwe-solvent: lolu hlobo lwe-stiffener lusekelwe ku-carboxyl (noma i-hydroxyl) njengeklasi lamakhemikhali noma ama-polymer e-organic, ancibilikiswa emanzini futhi akhe isakhiwo se-copolymer (ngokuvamile esisekelwe ku-ester). Noma i-polymerization yayo ukuthola uchungechunge olude lwama-molecule, indawo enkulu ebusweni, i-viscosity ephezulu futhi inezakhiwo ezinhle zokusabalala kanye nezinga elithile lokunamathela ohlelweni lokumboza oluhamba ngamanzi (ikakhulukazi kuncike enanini lesistimu ye-resin ku-stiffener) ye-polymer yesakhiwo esixhumene somkhiqizo. I-Stiffener iwuketshezi lwe-emulsion, olumuncwa ekushiseni kwegumbi futhi lubhekana nochungechunge lwezimpendulo zokwakha isakhiwo senethiwekhi. Ama-stiffener ngokuvamile aqukethe amanani amancane kasawoti, ama-carboxylic acid (isb., i-hydroxylamine, ama-phosphate esters, noma i-disodium sulfonate), noma amanani amancane ama-ion ensimbi njengezithasiselo. Uhla lokusetshenziswa kwalo lubanzi kakhulu, kufaka phakathi izembozo ezisekelwe emanzini , amafilimu epulasitiki, izinamathiselo nama-polymer aqukethe i-stiffener nawo angasetshenziswa njengezinto eziyisisekelo zezembozo noma imikhiqizo yepulasitiki.
- Okususelwe emanzini noma ku-oyela: kusebenza kuzo zonke izinhlobo zokumboza, ngokuvamile imikhiqizo yebanga eliphakathi;
- i-non-water soluble: ingancibilika emanzini bese ihlakazeka kancane kancane ku-emulsion ihlakazeke ngokulinganayo;
- Ukuxuba kwesigaba esiqinile: uketshezi lwe-emulsion lungangezwa ezintweni eziqinile ngezinhlobonhlobo ze-adhesives eziphilayo futhi zinyakaze kahle (eziqukethe ama-organic fillers) ukuze kuhlanganiswe; ukwengeza inani elifanele le-stiffener kuzokwenza ukuqina ngobulukhuni obuthile ukuze kuthuthukiswe izakhiwo zayo zemishini nokumelana nokuguga;
- Ukugqoka okuqinile okusekelwe emanzini.
- IV. Ukusetshenziswa kwe-ejenti eqinisayo kuma-organic coatings, amapulasitiki, irabha nezinye izimboni
Ukusetshenziswa kweziqinisi ezimbozweni ezisekelwe emanzini ikakhulukazi kuhloswe ukuguqula ama-polyester angagcwali, ama-emulsion e-copolymer, njll., okungathuthukisa ukusebenza kwama-resin okwenziwa. I-polymer eqinile ayinabo nje ubulukhuni bekhwalithi ephezulu, kodwa futhi inokumelana okuhle kwamanzi kanye nokumelana nokuguga. Uma isetshenziswa, i-ejenti yokuqinisa ingaxutshwa ibe yisisombululo esinokugxila okungu-20-40%, bese ingezwa eketheni yokusabela ukuze kuphendulwe i-emulsification, futhi i-emulsion yokuqinisa ephezulu ingatholakala ngemuva kokufaka inani elifanele lokuxutshwa. Lapho i-emulsion iqukethe ingxenye engaphezu kwengxenye yezinyibilikisi eziphilayo, kuzokwenzeka i-polymerization kanye nokubola, okungeke nje kunciphise ukusebenza kwe-resin kodwa futhi kubangele ukuguga kwemishini noma imikhiqizo. Ngakho-ke, ukwengeza inani elifanele le- ejenti yokuqinisa ekukhiqizweni kwe-coating kanye nohlelo lwe-polymer kungathuthukisa umphumela wayo wokusetshenziswa futhi kwenze umkhiqizo ube nokuguquguquka okungcono kanye nokumelana nokushisa okuphezulu.
- V. Izixwayiso
- I-ejenti eqinisayo izobola ibe yizinto ze-polar ngaphansi kwezimo zokushisa eziphezulu kanye nezimo eziphezulu zomswakama, ngakho-ke kufanele ivalwe futhi igcinwe ukuze kuvinjelwe ukuvuza nokungcoliswa komkhiqizo.
- Isitoreji kufanele singene umoya futhi somile, gcina igumbi lomile.
- Gwema ukubekeka elangeni.
- Engeza futhi usebenzise kancane uma ufaka isicelo.
- Ungaxubani noma uhlambulule umkhiqizo ngamanzi, noma uxube nezinye izinto ezilaphayo, izigcwalisi, izithako zombala, izigcwalisi noma izibala lapho usetshenziswa.
- Kwenqatshelwe ngokuphelele ukuxuba nomthofu, i-mercury nezinye izithasiselo zensimbi esindayo.
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