Rosin resin
Ka nako e ts'oanang, e boetse e na le karabelo ea carboxyl joalo ka esterification, joala, sebopeho sa letsoai, decarboxylation, le aminolysis.
Reprocessing ea bobeli ea rosin e ipapisitse le litšobotsi tsa rosin e nang le litlamo tse habeli le lihlopha tsa carboxyl, 'me rosin e fetoloa ho hlahisa letoto la rosin e fetotsoeng, e ntlafatsang boleng ba tšebeliso ea rosin.
Resin ea rosin e sebelisoa indastering ea likhomaretsi ho eketsa viscosity, ho fetola sekhomaretsi sa sekhomaretsi, thepa e kopaneng, jj.
Rosin resin ke motsoako oa tricyclic diterpenoid, o fumanoang ka likristale tse nang le monoclinic tse nang le ethanol e nang le metsi. Sebaka se qhibilihang ke 172 ~ 175 ° C, 'me ho potoloha ha optical ke 102 ° (anhydrous ethanol). Ha e qhibilihe ka metsing, ha e qhibilihe ka har'a ethanol, benzene, chloroform, ether, acetone, carbon disulfide le ho hlapolla tharollo e nang le aqueous sodium hydroxide.
Ke karolo e ka sehloohong ea resin ea tlhaho ea rosin. Li-ester tsa li-rosin acid (tse kang methyl esters, vinyl alcohol esters, le glycerides) li sebelisoa lipenteng le li-varnish, empa hape li sebelisoa lisepeng, lipolasitiking le lirapeng.
Ke polyol ester ea rosin acid. Li-polyols tse sebelisoang hangata ke glycerol le pentaerythritol. Polyol
Ntho e nolofatsang ea pentaerythritol rosin ester e phahame ho feta ea glycerol rosin ester, 'me ts'ebetso ea ho omisa, ho thatafala, ho hanyetsa metsi le lisebelisoa tse ling tsa varnish li molemo ho feta tsa li-varnish tse entsoeng ka glycerol rosin ester.
Haeba ester e lumellanang e entsoeng ka rosin ea polymerized kapa hydrogenated rosin e sebelisoa e le lisebelisoa tse tala, tšekamelo ea ho fetoha ha mebala e fokotsehile, 'me thepa e meng e boetse e ntlafatsoa ho isa tekanyong e itseng. Ntho e nolofatsang ea polymerized rosin ester e phahame ho feta ea rosin ester, ha ntlha ea ho nolofatsa ea hydrogenated rosin ester e tlaase.
Li-ester tsa rosin li hloekisoa ho tloha ho li-resin tsa rosin. Rosin resin e entsoe ka esterification ea rosin. Ka mohlala, rosin glyceride e entsoe ka rosin ka esterification ea glycerol.
Karolo e ka sehloohong ea resin ea rosin ke resin acid, e leng motsoako oa li-isomers tse nang le foromo ea molek'hule C19H29 COOH; rosin ester e bua ka sehlahisoa se fumanoeng ka mor'a hore ho be le esterification ea rosin resin, hobane ke ntho e fapaneng, kahoo ho ke ke ha khoneha ho bolela hore na ke sebaka sa mang. e kgolo.
Rosin-modified phenolic resin e ntse e tsebahala haholo ka mokhoa oa setso oa ho kopanya. Mokhoa oa mohato o le mong ke ho kopanya phenol, aldehyde le lisebelisoa tse ling tse tala le rosin ebe o itšoara ka ho toba.
Foromo ea ts'ebetso e bonolo, empa litlhoko tsa taolo tse kang ho futhumatsa ho latelang li batla li phahame; ts'ebetso ea mehato e 'meli ke ho kopanya phenolic condensate bohareng esale pele, ebe o itšoara ka tsamaiso ea rosin.
Mokhahlelo o mong le o mong o itseng oa karabelo qetellong o etsa resin e nang le boleng bo tlase ba asiti, ntlha e nolofatsang e phahameng, le boima ba molek'hule bo ka bapisoang le ho qhibiliha ho itseng lihlapolli tsa oli ea liminerale.
1. Mohato o le mong Molao-motheo oa Karabelo:
â Synthesis of resole phenolic resin: Alkylphenol e eketsoa ho rosin e qhibilihisitsoeng, 'me paraformaldehyde e teng ka har'a sisteme ka sebopeho sa granular, ebe e bola ho ba monomer formaldehyde, e kenang polycondensation ka alkylphenol.
â¡ Ho thehoa ha methine quinone: ho felloa ke metsi ka mocheso o phahameng, nakong ea ho futhumatsa, mosebetsi oa methylol tsamaisong o eketseha ka potlako, ho felloa ke metsi ka har'a molek'hule ea methylol ho etsahala, 'me karabelo ea condensation etherification pakeng tsa limolek'hule tsa methylol e etsahala, ho theha. Ho na le mefuta e fapaneng ea li-condensate tsa phenolic tse nang le likhato tse fapaneng tsa polymerization.
⢠Keketso ea rosin ho methine quinone le maleic anhydride: Eketsa maleic anhydride ho 180 ° C, sebelisa bond e sa tsitsang habeli ea anhydride ea maleic le bond e habeli ho rosin acid ho eketsa, 'me ka nako e le 'ngoe eketsa methine quinone ho rosin. Asiti e boetse e na le karabelo ea tlatsetso ea Diels-Alder ho hlahisa metsoako ea maleic anhydride chromofuran.
⣠Esterification ea polyol: Ho ba teng ha lihlopha tse ngata tsa carboxyl tsamaisong ho tla senya tekanyo ea tsamaiso le ho baka ho se tsitse ha resin.
Ka hona, re eketsa polyols le ho sebelisa esterification reaction pakeng tsa lihlopha tsa hydroxyl tsa polyols le lihlopha tsa carboxyl tsamaisong ho fokotsa boleng ba acid ea tsamaiso. Ka nako e ts'oanang, ka esterification ea polyols, li-polymers tse phahameng tse loketseng li-inks tsa khatiso tsa offset li thehoa.
2. Mehato e 'meli Molao-motheo oa Karabelo:
â Tlas'a ketso ea "catalyst" e khethehileng, formaldehyde e etsa mefuta e fapaneng ea li-oligomers tsa resole phenolic tse nang le palo e kholo ea methylol e sebetsang ka har'a tharollo ea alkylphenol. Kaha sistimi ha e na phello e thibelang ea asiti ea rosin, li-condensate tse nang le likarolo tse fetang 5 tsa sebopeho sa phenolic li ka etsoa.
â¡ Polyol le rosin li esterified mocheso o phahameng, 'me tlas'a ketso ea catalyst ea motheo, boleng ba acid e hlokahalang bo ka finyelloa kapele.
⢠Ka har'a rosin polyol ester e entsoeng, butle-butle eketsa motsoako oa resole phenolic resin, laola sekhahla sa ho eketsa le mocheso, 'me u qete ho eketsa. Ho felloa ke metsi ka mocheso o phahameng, 'me qetellong resin e lakatsehang e thehoa.
Molemo oa mohato o le mong ke hore litšila li tlosoa ka mokhoa oa mouoane, oo ho leng bonolo ho sebetsana le oona ka ho sireletsa tikoloho. Leha ho le joalo, phenolic condensation reaction e hlahang rosin e qhibilihisitsoeng e na le mekhoa e mengata ea mahlakoreng ka lebaka la mocheso o phahameng oa karabelo le ho qhibiliha ho sa tšoaneng.
Ho thata ho laola phetoho, 'me ha ho bonolo ho fumana lihlahisoa tse tsitsitseng tsa resin. Molemo oa mokhoa oa mehato e 'meli ke hore oligomer ea phenolic condensation e nang le sebopeho se batlang se tsitsitse le sebopeho se ka fumanoa, mohato o mong le o mong oa ho itšoara o bonolo ho o hlokomela,' me boleng ba sehlahisoa bo batla bo tsitsitse.
Bothata ke hore phenolic pulp condensate ea setso e tlameha ho fokotsoa ke asiti ebe e hlatsuoa ka metsi a mangata ho tlosa letsoai pele e ka sebetsana le rosin, e leng se bakang metsi a litšila a nang le phenol, a bakang tšenyo e kholo. tikoloho mme e ja nako e ngata.
Potso ea se nepahetseng le se fosahetseng ea mehato e le 'ngoe le mehato e' meli e se e le nako e telele e le maikutlo a baetsi ba enke. Empa haufinyane tjena, ka tsoelo-pele e atlehileng ea mokhoa oa ho se hlatsoe bakeng sa ho kopanya phenolic condensate, tlhaloso ea mokhoa oa ho kopanya mehato e 'meli e khothalelitsoe ka matla.
