Fidinta silsiladaha karboksylic hydrophilic DMBA iyo DMPA.

Hordhac

In wax soo saarka ee polyurethane biyaha, karboksylic acid sida anionic hydrophilic silsilad extender waa nooc ka mid ah karboksylic acid leh diol, kaas oo si ballaaran loo isticmaalo qaab-dhismeedka kelli gaar ah iyo wax soo saarka ugu fiican.
Kaarboxylic acid nooca silsiladaha inta badan waxaa ku jira 2,2-dihydroxymethylpropionic acid (DMPA) iyo 2,2-dihydroxymethylbutyric acid (DMBA).Waa unugyo kala duwan oo isku xiran oo kala duwan oo leh molecule hydroxyl iyo karboxyl labadaba.Ka dib markii laga takhaluso alkali, kooxda aashitada bilaashka ah waxay si firfircoon u wanaajin kartaa milanka biyaha ama waxqabadka firidhsan ee resin;Kooxaha polar ayaa la soo bandhigay si loo hagaajiyo adhesion ee dahaarka iyo sifooyinka midabaynta ee fiilooyinka synthetic;Kordhi milanka alkali ee dahaarka.Waxaa lagu dabaqi karaa nidaamka polyurethane ee biyaha-milmi kara, resin alkyd biyo-milmi kara iyo poliester resin, daahan epoxy ester, elastomer poliurethane iyo daahan budada ah.
Waxa kale oo loo isticmaali karaa qalabka kiimikada maqaarka, kiristaalo dareere ah, khadyada, cuntada lagu daro iyo kiimikooyinka xabagta, gaar ahaan soo saarista emulsion poliurethane biyaha iyo wakiilada dhamaystirka maqaarka.Ma aha oo kaliya fidiyaha silsiladda, laakiin sidoo kale walax wanaagsan oo is-emulsifying for polyurethane, kaas oo si weyn u hagaajin kara xasiloonida kareemka biyaha polyurethane, sidaas darteed si ballaaran ayaa loo isticmaalaa.

Faa'iidooyinka Isticmaalka Dihydroxymethyl Carboxylic Acid

Kareemka polyurethane ee aqueous wuxuu caadi ahaan soo saaraa wakiilka hydrophilic ee silsiladda molecular polyurethane, ka dibna dhexdhexaadinaysa alkali si uu u sameeyo milix, oo ku kala firdhiyo biyaha deionized by walaaqaya mashiinka si uu u sameeyo kareemka aqueous polyurethane.
Inta badan waxaa jira saddex nooc oo ah wakiilada hydrophilic ee loo isticmaalo polyurethane biyaha ka dhasha: anionic, cationic iyo non-ionic.Nooca anionic inta badan waxaa ka mid ah: 2,2-dihydroxymethylpropionic acid, 2,2-dihydroxymethylbutyric acid, tartaric acid, butanediol sulfonate, sodium ethylenediamineethanesulfonate, glycerol iyo maleic anhydride;Nooca Cationic inta badan waxaa ka mid ah: methyldiethanolamine, triethanolamine, iwm;Nooca aan ioniga ahayn inta badan waxaa ku jira hydroxyl polyetylen oxide la joojiyay.
Waxa ku jira wakiilka hydrophilic non-ionic sida polyetylen oxide waa inuu ahaadaa mid aad u sarreeya si ay u noqoto mid deggan.Qalabka polyurethane ee biyaha laga sameeyo oo ka samaysan hydroxyl polyoxyethylene ether sida kooxda hydrophilic waxay leedahay iska caabin elektrolyt ah oo wanaagsan, laakiin caabbinta biyaha ee filimku waa mid aad u liidata, sidaas darteed ma aha mid wax ku ool ah;
Wakiilka cationic hydrophilic, sida ethylenediamine sodium acrylate adduct, sida xarun hydrophilic, waxay ka dhigtaa dhammaan nidaamka falcelinta alkaline.Ma jiro falcelin degdeg ah oo keliya oo u dhexeeya - kooxda NH2 iyo - kooxda NCO, laakiin sidoo kale fal-celin ka dhexeeya - kooxda NCO iyo - nhcoo.Sidaa darteed, falcelintu way adag tahay in la xakameeyo oo way fududahay in la jebiyo.Waxaa intaa dheer, kareemka la diyaariyey wuxuu leeyahay qaybo aan fiicneyn iyo caabbinta biyaha ee filim-samaynta liidata, sidaas darteed looma isticmaali karo warshadaha;
Dihydroxymethyl karboksilic acid ee qaabka anionic waxa uu ka kooban yahay laba kooxood oo hydroxyl ah oo sidoo kale u dhaqma sidii silsilad fidiye.Kaalintan laba-geesoodka ah waxay ka dhigaysaa inay muujiso faa'iidooyin waaweyn diyaarinta is-dabaysha Pu lotion.Inta lagu jiro isku-dhafka carbamate, waxay ka dhigtaa habka falcelinta acidic.Xaaladaha acidic, falcelinta u dhaxaysa - NCO iyo - Oh waa mid khafiif ah, halka - nhcoo - kama qayb qaadanayso falcelinta mana keeni doonto jel.Intaa waxaa dheer, dimethylol carboxylic acid sidoo kale waxay u shaqeysaa sidii silsilad fidsan, si kooxda hydrophilic (ie, kooxda carboxyl) ay ku yaalaan qaybta silsiladda macromolecular.Isticmaalka amine sare sida wakiilka dhexdhexaadinta, resin polyurethane aqueous ah oo leh xasillooni aad u fiican iyo biyo-samaynta filimka wanaagsan iyo caabbinta dareeraha ayaa la diyaarin karaa.Dihydroxymethyl karboksylic acid waa xarunta ugu fiican ee hydrophilic si ballaaran loo isticmaalo diyaarinta xabagta polyurethane ee biyaha.

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

Ka mid ah labada nooc ee Dihydroxymethyl carboxylic acids, 2,2-dihydroxymethyl propionic acid ayaa la isticmaalay muddo dheer waana fidiyaha silsiladda hydrophilic si ballaaran loo isticmaalo hadda.Inkasta oo ay leedahay faa'iidooyin badan, haddana waxay leedahay faa'iidooyin badan, oo ay ugu wacan tahay barta dhalaalka sare (180-185 ℃), oo ay adag tahay in la kululeeyo oo la dhalaaliyo, taas oo u baahan in lagu daro dareeraha organic sida N-methylpyrrolidone (NMP). n N-dimethylamide (DMF), acetone, iwm., halka NMP ay leedahay bar karkarinta sare, taas oo ay adag tahay in la saaro ka dib diyaarinta APU.Waxaa intaa dheer, DMPA waxay leedahay milan yar oo acetone ah, iyo qadar badan oo acetone ah ayaa loo baahan yahay in lagu daro habka isku-dhafka.Habka ka saarista ketone ma luminayo tamarta laakiin sidoo kale waxay keentaa khataro badbaado.Sidaa darteed, isticmaalka 2,2-dihydroxymethylpropionic acid ma aha oo kaliya sare ee isticmaalka tamarta, laakiin sidoo kale ay fududahay in la keeno hadhaaga organic ee alaabta.
Marka la barbardhigo 2,2-dihydroxymethyl propionic acid, 2,2-dihydroxymethyl butyric acid waxay leedahay faa'iidooyinka soo socda:
1. Waxay leedahay milmayn wanaagsan oo dareerayaasha organic.Jadwalka soo socdaa wuxuu tusinayaa xogta milmida DMBA iyo DMPA ee heerkulka iyo dareerayaasha kala duwan;
Xogta milmay ee DMBA iyo DMPA heerkul kala duwan iyo dareerayaasha:

Solubility: halbeeg: g/100g dareere
Ku milmay biyaha: 48% DMBA iyo 12% ee DMPA.

2. Heerka falcelinta sare, xawaaraha falcelinta degdega ah iyo heerkulka falcelinta oo hooseeya.Tusaale ahaan, waqtiga falcelinta ee synthesizing poliurethane prepolymer waa gaaban yahay, guud ahaan kaliya 50-60 daqiiqo, halka DMPA qaadataa 150-180 daqiiqo;
3. Waxaa loo isticmaalaa kareemka polyurethane ee biyaha leh oo leh cabbirka qayb yar iyo qaybin cidhiidhi ah;
4. Barta dhalaalka hoose, 108-114 ℃;
5. Kala duwanaanshiyaha caanaha ayaa yarayn kara isticmaalka dareeraha, sidaas darteed hoos u dhigista qiimaha dareeraha iyo qashinka daaweynta dareeraha;
6. Waxaa loo isticmaali karaa in lagu diyaariyo nidaamka polyurethane iyo polyester-ka ee aan dareeraha lahayn;
Habka isku-dhafka dhabta ah, uma baahna in la isticmaalo wax dareere ah.Kareemka la soo saaray wuxuu leeyahay waxqabad wanaagsan iyo sifooyin farsamo oo heer sare ah oo filimka ah, kaas oo aan kaliya soo gaabin wakhtiga falcelinta, wuxuu yareeyaa isticmaalka tamarta, laakiin sidoo kale wuxuu badbaadiyaa tamarta.Sidaa darteed, 2,2-dihydroxymethyl butyric acid waa xarunta ugu caansan ee hydrophilic.