Rosin resin
Isla mar ahaantaana, waxay sidoo kale leedahay fal-celinta karboksylka sida esterification, khamriga, samaynta cusbada, decarboxylation, iyo aminolysis.
Dib-u-habaynta labaad ee rosinku waxay ku salaysan tahay sifooyinka rosin ee leh bonds double iyo kooxaha kaarboxyl, iyo rosin-ka ayaa wax laga beddelay si loo dhaliyo rosin taxane ah oo wax laga beddelay, taas oo hagaajinaysa isticmaalka qiimaha rosinka.
Xabagta Rosin waxaa loo isticmaalaa warshadaha xabagta si loo kordhiyo viscosity, beddelo dhejinta xabagta, guryaha isku xiran, iwm.
Rosin resin waa iskudhis tricyclic diterpenoid, oo laga helay kiristaalo monoclinic flaky ee ethanol aqueous. Barta dhalaalka waa 172 ~ 175 ° C, wareegga indhaha waa 102 ° (ethanol anhydrous). Aan biyo ku milmin, ku milma ethanol, benzene, chloroform, ether, acetone, kaarboon disulfide iyo milan aqueous sodium hydroxide.
Waa qaybta ugu muhiimsan ee resin rosin dabiiciga ah. Esters of rosin acids (sida methyl esters, vinyl alkohol esters, iyo glycerides) ayaa loo isticmaalaa rinjiga iyo varnishes, laakiin sidoo kale saabuunta, balaastikada, iyo resins.
Waa polyol ester of rosin acid. Polyols-ka caadiga ah ee la isticmaalo waa glycerol iyo pentaerythritol. Polyol-ka
Barta jilicsan ee pentaerythritol rosin ester ayaa ka sarreeya tan glycerol rosin ester, iyo waxqabadka qalajinta, adkaanta, caabbinta biyaha iyo sifooyinka kale ee varnish ayaa ka fiican kuwa ka samaysan glycerol rosin ester.
Haddii ester-ka u dhigma ee laga sameeyay rosin-polymerized ama rosin hydrogenated loo isticmaalo walxo cayriin ah, u janjeera midabka midabaynta waa la dhimay, guryaha kale ayaa sidoo kale la hagaajiyaa ilaa xad. Barta jilicsan ee rosin ester-ka polymerized ayaa ka sarraysa ta rosin ester-ka, halka barta jilicsan ee rosin ester-ka hydrogenated ay ka hooseyso.
Rosin esters waxaa laga sifeeyay resins rosin. Rosin resin waxa lagu sameeyaa esterification of rosin. Tusaale ahaan, rosin glyceride waxay ka samaysan tahay rosin iyadoo la esterification glycerol.
Qaybta ugu muhiimsan ee resin resin waa resin acid, kaas oo ah isku dhafka isomers oo leh caanaha molecular C19H29 COOH; rosin ester waxaa loola jeedaa badeecada la helay ka dib markii la nadiifiyo rosin resin, sababtoo ah waa walax ka duwan, sidaas darteed suurtagal maaha in la sheego cidda ay tahay. weyn.
Xabagta phenolic ee Rosin-la beddelay ayaa weli inta badan lagu gartaa habka isku-dhafka dhaqameed. Habka hal-tallaabo ah waa in lagu qaso phenol, aldehyde iyo alaabada kale ee ceeriinka ah ee rosin ka dibna si toos ah uga falceliso.
Foomka geeddi-socodku waa mid fudud, laakiin shuruudaha xakamaynta sida kuleyliyaha xiga ayaa aad u sarreeya; Habka laba-tallaabo waa in horay loo sii diyaariyo kondensate phenolic dhexdhexaad ah, ka dibna la falgaliyo nidaamka rosin.
Marxalad kasta oo falcelin gaar ah ayaa ugu danbeyn samaysa resin leh qiime aashito hooseeya, barta jilcinta sare, iyo miisaan unugyo la mid ah iyo milmi gaar ah oo dareerayaasha saliidda macdanta ah.
1. Hal tillaabo mabda'a falcelinta:
â Synthesis of resole phenolic resin: Alkylphenol waxa lagu daraa rosinka dhalaalay, paraformaldehyde waxa uu ku jiraa nidaamka qaab granular ah, ka dibna waxa uu u kala baxaa monomer formaldehyde, kaas oo ku dhaca falcelinta kondensation ee alkylphenol.
Sameynta methine quinone: fuuqbaxa heerkulka sare, habka kululaynta, dhaqdhaqaaqa methylol ee nidaamka ayaa si degdeg ah u kordha, fuuqbaxa gudaha molecule methylol ayaa dhacaya, iyo falcelinta etherification ee u dhexeeya molecules methylol ayaa dhacaya, samaynta Noocyo kala duwan oo ah condensates phenolic oo leh heerar kala duwan oo polymerization ah ayaa la heli karaa.
Ku darida rosin ee methine quinone iyo maleic anhydride: Ku dar anhydride maleic 180 °C, isticmaal isku xidhka labanlaaban ee anhydride maleic iyo bond bond ee rosin acid si aad ugu darto, oo isku mar ku dar methine quinone rosin. Asiidhku waxa kale oo uu maraa falcelinta dheeraadka ah ee Diels-Alder si ay u soo saarto xeryahooda koromofuran anhydride ee lab ah.
⣠Esterification of polyol: Jiritaanka kooxo badan oo kaarboxyl ah oo ku jira nidaamka waxay burburin doontaa dheelitirka nidaamka waxayna sababi doontaa xasillooni darrada resinka.
Sidaa darteed, waxaan ku darnaa polyols oo aan isticmaalnaa falcelinta esterification ee u dhexeeya kooxaha hydroxyl ee polyols iyo kooxaha karboksyl ee nidaamka si loo yareeyo qiimaha acid ee nidaamka. Isla mar ahaantaana, iyada oo loo marayo esterification of polyols, polymers sare oo ku habboon khadadka daabacaadda offset ayaa la sameeyay.
2. Habka laba-tilaabo ee mabda'a falcelinta:
â Marka la eego ficilka kicinta gaarka ah, formaldehyde waxa ay samaysaa noocyo kala duwan oo oligomers phenolic ah oo ka kooban xaddi badan oo methylol firfircoon ah oo ku jira xalka alkylphenol. Maadaama nidaamku aanu lahayn wax saameyn ah oo xannibaya rosin acid, kondensates leh in ka badan 5 unug qaab dhismeedka phenolic waa la soo saari karaa.
â¡ Polyol iyo rosin waxaa lagu nadiifiyaa heerkul sare, iyo ficilka kicinta aasaasiga ah, qiimaha aashitada ee loo baahan yahay si dhakhso ah ayaa loo gaari karaa.
â 3 rosin polyol ester-ka la fal-celiyay, si tartiib ah ugu dar resinka isku-darka leh ee phenolic dropwise, xakamee heerka isku-darka hoos u dhaca iyo heerkulka, oo dhamaystir ku darida hoos u dhaca. Fuuqbax heerkul sarreeya, iyo ugu dambeyntii resinkii la rabay ayaa la sameeyay.
Faa'iidada habka hal-tallaabo ayaa ah in qashinka laga saaro qaabka uumiga, taas oo sahlan in wax looga qabto ilaalinta deegaanka. Si kastaba ha ahaatee, falcelinta uumiga phenolic ee ku dhaca rosinka dhalaalay ayaa u nugul falcelino badan oo dhinac ah sababtoo ah heerkulka falcelinta sare iyo kala dirid aan sinnayn.
Hagaajintu way adag tahay in la xakameeyo, mana fududa in la helo badeecooyinka xabagta ee deggan. Faa'iidada habka laba-tallaabo waa in oligomer uumi phenolic ah oo leh qaab-dhismeed xasiloon iyo halabuurka la heli karo, marxalad kasta oo falcelin ah waa sahlan tahay in la kormeero, tayada badeecaduna waa mid deggan.
Khasaaraha ayaa ah in kondensate-dhaqameedka phenolic-ga ah ee caadiga ah ay tahay in laga takhaluso aashitada oo lagu luqluqo qadar badan oo biyo ah si looga saaro milix ka hor inta aysan la falcelinin rosinka, taasoo keentay qadar badan oo ah biyaha wasakhda ah ee phenol-ka ku jira, taas oo waxyeello weyn u geysta deegaanka oo waqti badan ku qaata.
Su'aasha saxda ah iyo khaladka ee hal-tallaabo iyo geeddi-socod laba-tallaabo ah ayaa muddo dheer diiradda saarayey soo-saareyaasha khad. Laakiin dhawaanahan, iyada oo si guul leh loo horumarinayo habka aan-dhaqinta ee loogu talagalay isku-dhafka phenolic condensate, fikradda habka isku-dhafka laba-tallaabo ayaa si xooggan loo dhiirrigeliyay.
