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Carboxylic hydrophilic chain e atolosa DMBA le DMPA.

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Ha ho etsoa polyurethane ea metsi, carboxylic acid e le anionic hydrophilic chain extender ke mofuta oa carboxylic acid e nang le diol, e 'nileng ea sebelisoa haholo bakeng sa sebopeho sa eona se ikhethang sa limolek'hule le ts'ebetso e ntle ea sehlahisoa.
Carboxylic acid Type chain extender haholo-holo e kenyelletsa 2,2-dihydroxymethylpropionic acid (DMPA) le 2,2-dihydroxymethylbutyric acid (DMBA).Ke molek'hule e ikhethang ea diol e koetsoeng e nang le lihlopha tse peli tsa hydroxyl le carboxyl.Ka mor'a ho se nke lehlakore ka alkali, sehlopha sa acid e sa lefelloeng se ka ntlafatsa ka matla ho qhibiliha ha metsi kapa ts'ebetso ea ho hasana ea resin;Lihlopha tsa polar li ile tsa hlahisoa ho ntlafatsa ho khomarela liphahlo le thepa ea ho daea ea likhoele tsa maiketsetso;Eketsa ho qhibiliha ha alkali ea ho roala.E ka sebelisoa ho sisteme ea polyurethane e qhibilihang ka metsing, resin ea alkyd e qhibilihang ka metsing le resin ea polyester, ho roala epoxy ester, polyurethane elastomer le ho roala phofo.
E ka boela ea sebelisoa ka lisebelisoa tsa lik'hemik'hale tsa letlalo, likristale tsa metsi, li-inks, li-additives tsa lijo le lik'hemik'hale tse khomarelang, haholo-holo ha ho etsoa metsi a emulsion polyurethane le lisebelisoa tsa ho qeta letlalo.Ha se feela ketane ea ketane, empa hape ke moemeli o motle oa ho iketsetsa emulsifying bakeng sa polyurethane, e ka ntlafatsang haholo botsitso ba lotion ea metsi a polyurethane, kahoo e sebelisoa haholo.

Melemo ea ho sebelisa Dihydroxymethyl Carboxylic Acid

Aqueous polyurethane lotion hangata e kenya hydrophilic agent ka har'a polyurethane molecular chain, ebe e theola alkali ho etsa letsoai, ebe e qhalakana ka metsing a deionized ka ho sisinyeha ka mochini ho etsa polyurethane aqueous lotion.
Haholo-holo ho na le mefuta e meraro ea li-hydrophilic agents tse sebelisoang metsing a polyurethane: anionic, cationic le non-ionic.Mofuta oa anionic haholo-holo o kenyelletsa: 2,2-dihydroxymethylpropionic acid, 2,2-dihydroxymethylbutyric acid, tartaric acid, butanediol sulfonate, sodium ethylenediamineethanesulfonate, glycerol le maleic anhydride;Mofuta oa cationic haholo-holo o kenyelletsa: methyldiethanolamine, triethanolamine, joalo-joalo;Mofuta o seng oa ionic haholo-holo o kenyelletsa hydroxyl terminated polyethylene oxide.
Likahare tsa li-non-ionic hydrophilic agent tse kang polyethylene oxide li tlameha ho ba tse phahameng haholo ho etsa hore phallo e tsitsitse.Resin ea polyurethane e nang le metsi e entsoeng ka hydroxyl polyoxyethylene ether e le sehlopha sa hydrophilic se na le khanyetso e ntle ea electrolyte, empa ho hanyetsa metsi ha filimi ho fokola haholo, kahoo ha ho sebetse;
Cationic hydrophilic agent, e kang ethylenediamine sodium acrylate adduct, e le motsoako oa hydrophilic, e etsa hore tsamaiso eohle ea karabelo e be alkaline.Ha ho na karabelo e potlakileng feela lipakeng tsa - sehlopha sa NH2 le - sehlopha sa NCO, empa hape le karabelo lipakeng tsa - sehlopha sa NCO le - nhcoo.Ka hona, karabelo e thata ho e laola 'me ho bonolo ho gel.Ho feta moo, lotion e lokiselitsoeng e na le likaroloana tse mahoashe le ho hanyetsa metsi a fokolang filimi, kahoo e ke ke ea sebelisoa indastering;
Dihydroxymethyl carboxylic acid ka sebopeho sa anionic e na le lihlopha tse peli tsa hydroxyl hape e sebetsa joalo ka ketane ea ketane.Karolo ena e habeli e etsa hore e bonts'e melemo e meholo boitokisetsong ba ho iketsa emulsifying Pu lotion.Nakong ea tlhahiso ea carbamate, e etsa hore tsamaiso ea karabelo e be acidic.Tlas'a maemo a acidic, karabelo pakeng tsa - NCO le - Oh e bonolo, athe - nhcoo - ha e kopanele karabelong 'me e ke ke ea baka gel.Ntle le moo, dimethylol carboxylic acid e boetse e sebetsa joalo ka ketane extender, e le hore sehlopha sa hydrophilic (ke hore, sehlopha sa carboxyl) se fumaneha karolong ea ketane ea macromolecular.Ho sebelisa amine ea thuto e phahameng e le ntho e sa tsitsang, ho ka lokisoa resin e nang le metsi a polyurethane e nang le botsitso bo babatsehang le metsi a babatsehang a etsang filimi le ho hanyetsa solvent.Dihydroxymethyl carboxylic acid ke motsoako o motle ka ho fetisisa oa hydrophilic o sebelisoang haholo ho lokisoa ha metsi a polyurethane resin.

2,2-Dihydroxymethylpropionic Acid (DMPA) Le 2,2-Dihydroxymethylbutyric Acid (DMBA)

Har'a mefuta e 'meli ea Dihydroxymethyl carboxylic acid, 2,2-dihydroxymethyl propionic acid esale e sebelisoa ka nako e telele mme ke hydrophilic chain extender e sebelisoang haholo hajoale.Le hoja e na le melemo e mengata, e boetse e na le mefokolo e mengata, haholo-holo ka lebaka la sebaka se phahameng sa ho qhibiliha (180-185 ℃), se thata ho futhumatsa le ho qhibiliha, se hlokang ho eketsoa ha li-solvents tse kang N-methylpyrrolidone (NMP), n N-dimethylamide (DMF), acetone, joalo-joalo, ha NMP e na le ntlha e phahameng ea ho belisa, eo ho leng thata ho e tlosa ka mor'a ho lokisetsa APU.Ho feta moo, DMPA e na le solubility e nyane ho acetone, 'me palo e kholo ea acetone e hloka ho eketsoa ts'ebetsong ea ho kopanya.Ts'ebetso ea ho tlosa ketone ha e senye matla feela empa e boetse e tlisa likotsi tsa polokeho.Ka hona, tšebeliso ea 2,2-dihydroxymethylpropionic acid ha e phahame feela ka matla a matla, empa hape e bonolo ho baka masala a manyolo ka sehlahisoa.
Ha ho bapisoa le 2,2-dihydroxymethyl propionic acid, 2,2-dihydroxymethyl butyric acid e na le melemo e latelang:
1. E na le ho qhibiliha ho molemo ho li-solvents.Tafole e latelang e bonts'a data ea solubility ea DMBA le DMPA ka mocheso o fapaneng le lihlapolli;
Lintlha tsa Sollubility tsa DMBA le DMPA ka lithempereichara tse fapaneng le li-solvents:

Nomoro ea letoto

Mocheso ℃

Acetone

Methyl ethyl ketone

Methyl isobutyl ketone

DMBA

DMPA

DMBA

DMPA

DMBA

DMPA

1

20

15

1

7

0.4

2

0.1

2

40

44

2

14

0.8

7

0.5

Sollubility: yuniti: g / 100g solvent
Ho qhibiliha ha metsi: 48% bakeng sa DMBA le 12% bakeng sa DMPA.

2. Sekhahla se phahameng sa karabelo, lebelo la karabelo e potlakileng le mocheso o tlase oa karabelo.Mohlala, nako ea karabelo bakeng sa ho kopanya polyurethane prepolymer e khuts'oane, hangata ke metsotso e 50-60 feela, ha DMPA e nka metsotso e 150-180;
3. E sebelisoa bakeng sa lotion ea polyurethane e nang le metsi e nang le boholo bo botle ba likaroloana le kabo e moqotetsane;
4. Sebaka se tlaase sa ho qhibiliha, 108-114 ℃;
5. Mefuta e fapa-fapaneng ea liforomo e ka fokotsa tšebeliso ea li-solvents, kahoo e fokotsa litšenyehelo tsa li-solvents le ho senya phekolo ea metsi;
6. E ka sebelisoa ho lokisetsa litsamaiso tse se nang solvent ka ho feletseng tsa polyurethane le polyester;
Ts'ebetsong ea 'nete ea ho kopanya, ha ho hlokahale hore e je ntho leha e le efe e qhibilihisang.Lotion e hlahisoang e na le ts'ebetso e ntle le thepa e babatsehang ea mochine oa filimi, e seng feela e khutsufatsang nako ea ho itšoara, e fokotsa tšebeliso ea matla, empa hape e boloka matla.Ka hona, 2,2-dihydroxymethyl butyric acid ke motsoako o tsebahalang haholo oa hydrophilic.

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Nako ea poso: Sep-13-2022