Focus on Cellulose ethers

Zingaki izinhlobo ze-thickener kupende?

I-Thickener iwuhlobo olukhethekile lwesithasiselo se-rheological, umsebenzi wayo oyinhloko ukwandisa i-viscosity yoketshezi lwepende, ukuthuthukisa ukusebenza kwesitoreji, ukusebenza kokwakhiwa kanye nomphumela wefilimu kapende.

Indima yama-thickeners kuma-coatings

jiya

Ukungaxazululi

Ingangeni manzi

I-Anti-sagging

I-Anti shrinkage

Thuthukisa ukusebenza kahle kokuhlakazeka

Thuthukisa ukusebenza kokwakha

Khulisa ukujiya kwefilimu kapende

Thuthukisa umphumela ongaphezulu

Izici zama-thickeners ahlukahlukene

1. Inorganic thickener

Okuvame ukusetshenziswa kakhulu yi-organic bentonite, ingxenye yayo eyinhloko i-montmorillonite. Isakhiwo saso esikhethekile se-lamellar singanikeza ukumbozwa nge-pseudoplasticity eqinile, i-thixotropy, ukuzinza kokumiswa kanye nokuthambisa. Isimiso sokuqina ukuthi i-powder ithatha amanzi futhi ikhukhumale ukuze ikhulise isigaba samanzi, ngakho inokugcinwa kwamanzi okuthile.

Okubi yilezi: ukugeleza okungekuhle nokusebenza kwezinga, akulula ukukuhlakaza nokungeza.

2. I-cellulose ether

Okuvame ukusetshenziswa kakhului-hydroxyethyl cellulose(HEC), enekhono eliphezulu lokuqina, ukumiswa okuhle, ukuhlakazeka kanye nezindawo zokugcina amanzi, ikakhulukazi ukuqinisa isigaba samanzi.

Okubi yilezi: ukuthikameza ukumelana namanzi kwe-coating, ukusebenza okwanele kokulwa nesikhunta, kanye nokusebenza kabi kwezinga.

3. I-Acrylic

Ama-thickeners e-Acrylic ngokuvamile ahlukaniswe abe izinhlobo ezimbili: i-acrylic alkali-swellable thickeners (ASE) kanye ne-associative alkali-swellable thickeners (HASE).

Umgomo wokujiya we-acrylic acid alkali-swellable thickener (ASE) uwukuhlukanisa i-carboxylate lapho i-pH ilungiswa ibe yi-alkaline, ukuze iketango lamangqamuzana linwetshwe lisuka ku-helical liye entweni ngokusebenzisa ubulili obufanayo bokwehliswa kwe-electrostatic phakathi kwama-ion e-carboxylate. , ukuthuthukisa i-Viscosity yesigaba se-aqueous. Lolu hlobo lwe-thickener lubuye lube nokusebenza kahle kokuqina okuphezulu, i-pseudoplasticity eqinile kanye nokumiswa okuhle.

I-associative alkali-swellable thickener (HASE) yethula amaqembu e-hydrophobic ngesisekelo sama-alkali-swellable thickeners ajwayelekile (ASE). Ngokufanayo, lapho i-pH ilungiswa ku-alkaline, ubulili obufanayo be-electrostatic repulsion phakathi kwe-ion ye-carboxylate yenza Iketanga le-molecular lisuka ku-helical shape kuya kusimo senduku, okwandisa i-viscosity yesigaba samanzi; futhi amaqembu e-hydrophobic ethulwe ochungechungeni oluyinhloko angahlotshaniswa nezinhlayiya ze-latex ukwandisa i-viscosity yesigaba se-emulsion.

Okubi yilezi: ukuzwela ku-pH, ukugeleza okunganele kanye nokulingana kwefilimu kapende, kulula ukujiya ngemva kwalokho.

4. I-polyurethane

I-Polyurethane associative thickener (HEUR) i-hydrophobically modified ethoxylated polyurethane water-soluble polymer, okungeye-non-ionic associative thickener. Iqukethe izingxenye ezintathu: isisekelo se-hydrophobic, i-hydrophilic chain kanye nesisekelo se-polyurethane. Isisekelo se-polyurethane siyanda kwisisombululo sepende, futhi iketanga le-hydrophilic lizinzile esigabeni samanzi. Isisekelo se-hydrophobic sihlotshaniswa nezakhiwo ze-hydrophobic njengezinhlayiya ze-latex, ama-surfactants, nama-pigments. , ukwakha isakhiwo senethiwekhi esinezinhlangothi ezintathu, ukuze kufezwe injongo yokuqina.

Ibonakala ngokuqina kwesigaba se-emulsion, ukugeleza okuhle kakhulu nokusebenza kwezinga, ukusebenza kahle kokuqina nokugcinwa kwe-viscosity ezinzile, futhi akukho mkhawulo we-pH; futhi inezinzuzo ezisobala ekuphikisweni kwamanzi, i-gloss, obala, njll.

Ukungalungi yilezi: ohlelweni lwe-viscosity ephakathi nendawo, umphumela wokulwa nokuhlalisa ku-powder awulungile, futhi umphumela wokuqina uthinteka kalula ngama-dispersants kanye ne-solvents.


Isikhathi sokuthumela: Dec-12-2022
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