Carboxylic hydrophilic chain inowedzera DMBA uye DMPA.

Nhanganyaya

Mukugadzirwa kwepolyurethane yemvura, carboxylic acid seanionic hydrophilic chain extender imhando yecarboxylic acid ine diol, iyo yakashandiswa zvakanyanya kune yayo yakasarudzika mamorekuru uye kuita kwakanaka kwechigadzirwa.
Carboxylic acid type chain extender inonyanya kusanganisira 2,2-dihydroxymethylpropionic acid (DMPA) uye 2,2-dihydroxymethylbutyric acid (DMBA).Iyo yakasarudzika yakasarudzika yakavharika diol molecule ine ese hydroxyl uye carboxyl mapoka.Mushure me neutralization nealkali, iyo yemahara asidhi boka rinogona kushingaira kuvandudza kunyungudika kwemvura kana kupararira kwekuita kweresin;Mapoka epolar akaunzwa kuti avandudze kusungirirwa kwejasi uye kudhaya maitiro ekugadzira fibers;Wedzera alkali solubility yekuputira.Inogona kuiswa kumvura-soluble polyurethane system, mvura-inonyungudika alkyd resin uye polyester resin, epoxy ester coating, polyurethane elastomer uye poda coating.
Inogonawo kushandiswa mumatehwe emakemikari zvinhu, makristasi emvura, ingi, zvinowedzera zvekudya uye makemikari anonamatira, kunyanya mukugadzirwa kwemvura emulsion polyurethane uye matehwe ekupedzisa.Haisi chete chain extender, asiwo yakanaka self emulsifying agent ye polyurethane, iyo inogona kuvandudza zvakanyanya kugadzikana kwepolyurethane mvura lotion, saka inoshandiswa zvakanyanya.

Zvakanakira Kushandisa Dihydroxymethyl Carboxylic Acid

Aqueous polyurethane lotion inowanzopinza hydrophilic agent mu polyurethane molecular chain, yobva yaita neutralizes nealkali kuumba munyu, uye inopararira mumvura yakashambidzwa ne mechanical inomutsa kuti igadzire polyurethane aqueous lotion.
Kune kunyanya matatu marudzi e hydrophilic agents anoshandiswa mumvura ye polyurethane: anionic, cationic uye isiri-ionic.Mhando yeanionic inonyanya kusanganisira: 2,2-dihydroxymethylpropionic acid, 2,2-dihydroxymethylbutyric acid, tartaric acid, butanediol sulfonate, sodium ethylenediamineethanesulfonate, glycerol uye maleic anhydride;Cationic type inonyanya kusanganisira: methyldiethanolamine, triethanolamine, nezvimwewo;Non ionic mhando inonyanya kusanganisira hydroxyl terminated polyethylene oxide.
Zviri mukati meiyo isiri-ionic hydrophilic agent senge polyethylene oxide inofanira kunge yakakwira zvakanyanya kuita kuti kupararira kugadzikane.Mvura inonzi polyurethane resin yakagadzirwa nehydroxyl polyoxyethylene ether seboka re hydrophilic rine simba rakanaka re electrolyte, asi kudzivirira kwemvura kwefirimu kwakashata zvikuru, saka hazviiti;
Cationic hydrophilic agent, yakadai se ethylenediamine sodium acrylate adduct, se hydrophilic compound, inoita iyo yese reaction system alkaline.Iko hakusi kungokurumidza kuita pakati - NH2 boka uye - NCO boka, asiwo maitiro pakati - NCO boka uye - nhcoo.Naizvozvo, kuita kwakaoma kudzora uye kuri nyore gel.Uyezve, lotion yakagadzirirwa ine zvidimbu zvakakoshera uye yakashata firimu-inogadzira mvura inodzivirira, saka haigone kushandiswa muindasitiri;
Iyo Dihydroxymethyl carboxylic acid mune anionic fomu ine maviri hydroxyl mapoka uye inoshandawo sengetani yekuwedzera.Iri basa rehuviri rinoita kuti riratidze mabhenefiti makuru mukugadzirira kwekuzvimiririra emulsifying Pu lotion.Munguva yekubatanidzwa kwe carbamate, inoita iyo reaction system acidic.Pasi pemamiriro e acidic, maitiro ari pakati pe - NCO uye - Ah akapfava, nepo - nhcoo - haatore chikamu mukuita uye haazokonzeri gel.Mukuwedzera, dimethylol carboxylic acid inoshandawo sengetani yekuwedzera, kuitira kuti boka re hydrophilic (kureva, boka re carboxyl) riri muchikamu che macromolecular chain.Uchishandisa tertiary amine seine neutralizing agent, aqueous polyurethane resin ine kugadzikana kwakanyanya uye yakanakisa firimu-inogadzira mvura uye inonyungudutsa inodzivirira inogona kugadzirwa.Dihydroxymethyl carboxylic acid ndiyo yakanakisa hydrophilic komputa inoshandiswa zvakanyanya mukugadzirwa kwemvura polyurethane resin.

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

Pakati pemhando mbiri dzeDihydroxymethyl carboxylic acids, 2,2-dihydroxymethyl propionic acid yakashandiswa kwenguva yakareba uye ndeye hydrophilic chain extender inoshandiswa zvakanyanya parizvino.Kunyange zvazvo iine zvakawanda zvakanaka, inewo zvakawanda zvisingabatsiri, kunyanya nekuda kwekunyunguduka kwayo (180-185 ℃), iyo yakaoma kupisa nekunyunguduka, izvo zvinoda kuwedzerwa organic solvents seN-methylpyrrolidone (NMP), n N-dimethylamide (DMF), acetone, nezvimwewo, nepo NMP ine yakakwirira yekubikira, iyo yakaoma kubvisa mushure mekugadzirira APU.Uyezve, DMPA ine kunyungudika kudiki muacetone, uye huwandu hukuru hweacetone hunoda kuwedzerwa mukuita kwe synthesis.Nzira yekubvisa ketone haingotambisi simba chete asiwo inounza njodzi dzekuchengetedza.Nokudaro, kushandiswa kwe2,2-dihydroxymethylpropionic acid haisi yepamusoro chete mukushandiswa kwesimba, asiwo nyore kukonzera masara ehupenyu muchigadzirwa.
Kuenzaniswa ne2,2-dihydroxymethyl propionic acid, 2,2-dihydroxymethyl butyric acid ine zvinotevera zvakanakira:
1. Iine solubility iri nani mune organic solvents.Tafura inotevera inoratidza iyo solubility data yeDMBA neDMPA mukupisa kwakasiyana uye zvinonyungudutsa;
Solubility data yeDMBA neDMPA mukupisa kwakasiyana uye zvinonyungudutsa:

Solubility: chikwata: g / 100g solvent
Solubility mumvura: 48% yeDMBA uye 12% yeDMPA.

2. High reaction rate, fast reaction speed uye low reaction tembiricha.Semuenzaniso, nguva yekuita yekugadzira polyurethane prepolymer ipfupi, kazhinji chete 50-60 maminetsi, nepo DMPA inotora 150-180 maminetsi;
3. Inoshandiswa kumvura ye polyurethane lotion ine yakanatswa particle size uye nhete kugovera;
4. Kunyungudika kwakaderera, 108-114 ℃;
5. Kusiyana-siyana kwemaitiro kunogona kuderedza kushandiswa kwezvinonyungudutsa, nokudaro kuderedza mari yezvinonyungudutsa uye marara emvura kurapwa;
6. Inogona kushandiswa kugadzirira zvachose solvent-isina polyurethane uye polyester systems;
Mune chaiyo synthesis process, haidi kushandisa chero solvent.Iyo lotion inogadzirwa ine maitiro akanaka uye yakanakisa mechanical properties yefirimu, iyo isingangopfupiki nguva yekuita, inoderedza kushandiswa kwesimba, asiwo inochengetedza simba.Naizvozvo, 2,2-dihydroxymethyl butyric acid ndiyo inonyanya kuzivikanwa hydrophilic compound.