Uphando kunye nophuhliso lwe-dimethyldiethoxysilane

Isisombululo esiqhelekileyo se-silicone resin sisetyenziswa kakhulu njenge-polymer eyisiseko ye-coating-resistant-resistant, i-coat resistant weather kunye ne-high-temperature insulation material material.

1.2 i-technical evolution ye-silicone resin

Phakathi kwazo zonke iintlobo zeepolima ze-silicone, i-silicone resin luhlobo lwemveliso ye-silicone eyenziwe yaze yasetyenziswa kwangoko. Xa kuthelekiswa nophuhliso olunesantya esiphezulu setekhnoloji yokuhlaziya irabha ye-silicone, ukuphuculwa kobuchwephesha be-silicone resin kuyacotha noko, kwaye impumelelo enkulu yetekhnoloji imbalwa. Ukusukela malunga neminyaka engama-20 eyadlulayo, ngenxa yenkqubela phambili yezobuchwephesha ye-heterocyclic ekwazi ukumelana nobushushu, ezinye zazo zazisetyenziswa ekuqaleni kwibala le-silicone resin. Nangona kunjalo, ubutyhefu obunyibilikayo kunye neemeko ezibuhlungu zokunyanga iipholima ezinevumba elimnandi ze-heterocyclic ezikwazi ukumelana nobushushu zinciphise ukusetyenziswa kwazo. Kwiminyaka yakutshanje, abantu baqala ukubeka ingqalelo ngakumbi kuphando kunye nophuhliso lwe-silicone resin. I-resin ye-silicone inoluhlu olubanzi lobushushu kunye nokumelana nokuguga. Ukusebenza kunye ne-hydrophobic-proof-proof performance ilungile kunye nezinye iingenelo ezibalaseleyo, kukho imiqondiso yokuba i-silicone resin ingaba nesithuba esikhulu sophuhliso kwixesha elizayo.

2. I-resin ye-silicone ngokubanzi

2.1 inkqubo yokuvelisa i-silicone resin jikelele

Iindidi ezahlukeneyo ze-silicone zinemathiriyeli ekrwada eyahlukeneyo kunye neendlela zokwenziwa. Kweli phepha, inkqubo yokuvelisa iintlobo ezininzi ze-silicone resins ifakwe ngokulula.

2.1.1 i-silicone ye-methyl

2.2.1.1 i-synthesis ye-methylsilicone resin esuka kwi-methylchlorosilane

I-Methylsilicones idityaniswe ne-methylchlorosilane njengeyona nto iphambili ekrwada. Ngenxa yesakhiwo esahlukileyo kunye nokubunjwa kwee-silicones (i-degree of crosslinking of silicones, oko kukuthi, [CH3] / [Si] ixabiso), iimeko ezahlukeneyo zokudibanisa ziyafuneka.

Xa i-R / Si ephantsi ([CH3] / [Si] ≈ 1.0) i-methyl abicah resin yenziwe, i-hydrolysis kunye ne-condensation reaction speed ye-monomers engundoqo ekrwada i-methyltrichlorosilane ikhawuleza kakhulu, kwaye ubushushu bokuphendula kufuneka ilawulwe ngokungqongqo ngaphakathi kwe-0 ℃ , kwaye ukusabela kufuneka kuqhutywe kwi-solvent edibeneyo, kwaye ixesha lokugcinwa kwemveliso yokusabela kwiqondo lokushisa liyientsuku ezimbalwa kuphela. Olu hlobo lwemveliso lunexabiso elincinane elisebenzayo.

Kwi-synthesis ye-R / Si methylsilicone resin, i-methyltrichlorosilane kunye ne-dimethyldichlorosilane isetyenziswa. Nangona i-hydrolytic condensation reaction yomxube we-methyltrichlorosilane kunye ne-dimethyldichlorosilane icotha kancinane kune-methyltrichlorosilane iyodwa, i-hydrolytic condensation reaction speed ye-methyltrichlorosilane kunye ne-dimethyldichlorosilane yahluke kakhulu, ehlala ibangelwa yi-hydrolytic condensation ye-methyltrichlorosilane in advance. I-hydrolyzate ayihambelani nomlinganiselo wee-monomers ezimbini, kwaye i-methyl chlorosilane isoloko i-hydrolyzed ukuze yenze ijeli ye-crosslinking yendawo, ekhokelela kwiipropati ezimbi ezibanzi ze-methyl silicone resin efunyenwe kwi-hydrolysis ye-monomer emithathu.

2.2.1.2 i-synthesis ye-methylsilicone esuka kwi-methylalkoxysilane

Ireyithi yokusabela ye-hydrolysis condensation ye-methylalkoxysilane inokulawulwa ngokuguqula iimeko zokusabela. Ukuqala kwi-methylalkoxysilane, i-methylsilicone resin ene-degrees ezinqamlezileyo ezahlukeneyo inokwenziwa.

I-methylsilicones yorhwebo kunye ne-moderate degree of crosslinking ([CH3] / [Si] ≈ 1.2-1.5) ininzi ilungiswe yi-hydrolysis kunye ne-condensation ye-methylalkoxysilane. I-monomers ye-methyltriethoxysilane kunye ne-dimethyldiethoxysilane esulungekiswe yi-deacidification ixutywe namanzi, yongezwa kunye ne-trace hydrochloric acid okanye isixa esifanelekileyo se-acid cation exchange resin eqinile (impembelelo ye-catalysis ye-macroporous eyomeleleyo ye-acid ion exchange resin ingcono), kwaye uphile. Udongwe lwezesondo (olulomisiweyo emva kwe-acidification) lusetyenziswa njenge-catalyst, i-heatered kunye ne-hydrolyzed. Xa isiphelo sifikelelwe, yongeza inani elifanelekileyo le-hexamethyldisilazane ukuze unciphise i-catalyst hydrochloric acid, okanye ukucoca i-ion exchange resin okanye udongwe olusebenzayo olusetyenziswa njenge-catalyst ukuphelisa ukusabela kwe-condensation. Imveliso efunyenweyo isisombululo sotywala se-methylsilicone resin.

2.2.2 i-silicone ye-methyl phenyl

Izinto eziphambili zokuvelisa i-industry ye-methylphenyl silicone resin yi-methyltrichlorosilane, i-dimethyldichlorosilane, i-Phenyltrichlorosilane kunye ne-Diphenyldichlorosilane. Ezinye okanye zonke iimonomers ezingentla zongezwa kunye ne-solvent toluene okanye i-xylene, ixutywe ngokufanelekileyo, iphoswe emanzini phantsi kokuphazamiseka, ubushushu obulawulwa kwi-hydrolysis reaction, kunye ne-HCl (i-hydrochloric acid aqueous solution), imveliso yokuphendula, iyasuswa. ngokuhlamba ngamanzi. Isisombululo se-silicone se-hydrolyzed sifunyenwe, kwaye ke inxalenye ye-solvent i-evaporated ukuze yenze i-silicone yoxinaniso yotywala, kwaye ke i-silicone resin ilungiswa ngokuxinwa okubandayo okanye ukuphendulwa kobushushu, kwaye i-resin ye-silicone egqityiweyo ifunyenwe ngokucoca kunye nokupakishwa.

2.2.3 injongo ngokubanzi i-methyl phenyl vinyl silicone resin kunye namalungu ayo ahambelanayo

Inkqubo yokuvelisa i-methyl phenyl vinyl silicone resin ifana ne-methyl phenyl silicone resin, ngaphandle kokuba ukongeza kwi-methyl chlorosilane kunye ne-phenyl chlorosilane monomers, inani elifanelekileyo le-methyl vinyl dichlorosilane kunye nezinye i-vinyl equkethe i-silicone monomers yongezwa kwi-hydrolysis eluhlaza. izixhobo. I-monomers exutywe i-hydrolyzed, ihlanjwe kwaye igxininiswe ukufumana i-silanol egxininisiweyo ye-hydrolyzed, yongeza i-metal organic acid salt catalyst, i-decompressing ubushushu kwi-viscosity echazwe kwangaphambili, okanye ukulawula indawo yokuphela kwempendulo ye-condensation ngokwexesha le-gelation, kunye nokulungiselela i-methyl phenyl vinyl silicone resin.

I-Methylphenyl hydropolysiloxane, esetyenziswa njengenxalenye ye-crosslinker ukongeza ukusabela kwe-methylphenyl vinyl silicone resin, ngokuqhelekileyo i-ring or linear polymer ene-degree encinci ye-polymerization. Ziveliswa nge-hydrolysis kunye ne-cyclization ye-methylhydrodichlorosilane, okanye nge-CO hydrolysis kunye ne-condensation ye-methylhydrodichlorosilane, i-Phenyltrichlorosilane kunye ne-trimethylchlorosilane.

2.2.4 i-silicone elungisiweyo

Ukuveliswa kokudibanisa i-resin eguquliweyo ye-silicone kunye ne-organic resin ngokuqhelekileyo kwi-toluene okanye isisombululo se-xylene se-methylphenyl silicone resin, ukongeza i-alkyd resin, i-phenolic resin, i-acrylic resin kunye nezinye i-resin eziphilayo, ukuxuba ngokupheleleyo ngokulinganayo ukufumana imveliso egqityiweyo.

I-copolymerized modified silicone resin ilungiswa ngokulandelelana kweekhemikhali. Iintlaka eziphilayo ezinokuthi zicopolymerized kunye ne-silicone ziquka i-polyester, i-epoxy, i-phenolic, i-melamine formaldehyde, i-polyacrylate, njl. Iindlela ezahlukeneyo zeendlela zokwenziwa zingasetyenziselwa ukulungiselela i-copolymerized silicone resin, kodwa eyona ndlela isebenzayo yokuvelisa imveliso yi-copolymerization ye-silicone yotywala kunye intlaka ephilayo. Oko kukuthi, i-hydrolysis ye-methyl chlorosilane kunye ne-phenyl chlorosilane monomers kunye ukuze bafumane isisombululo se-silicon ye-hydrolyzed okanye isisombululo esigxininisiweyo, kwaye emva koko ukongeza i-prepolymer ye-presynthesized organic resin kwi-catalyst, emva koko ukuxuba i-co-joat evaporation solvent, ukongeza i-zinc, i-zinc naphthenate kunye nezinye ii-catalysts, kunye nokuphendula kwe-condensation kwiqondo lokushisa le-150-170 degree, de izinto reaction ifike viscosity efanelekileyo okanye ixesha gelation kwangaphambili, ukupholisa, Ukongeza isinyibilikisi ukunyibilika kunye lokucoca ukufumana imveliso egqityiweyo abicah resin copolymerized.