Ucwaningo nokuthuthukiswa kwe-dimethyldiethoxysilane

Isixazululo esijwayelekile se-silicone resin sisetshenziswa ikakhulukazi njenge-polymer eyisisekelo ye-coating-resistant-resistant, i-coat resistant weather kanye ne-high-temperature insulation material material.

1.2 Ukuziphendukela kwemvelo kwe-silicone resin

Phakathi kwazo zonke izinhlobo zama-silicone polymers, i-silicone resin iwuhlobo lomkhiqizo we-silicone ohlanganiswe futhi wasetshenziswa kusenesikhathi.Uma kuqhathaniswa nokuthuthukiswa kwesivinini esikhulu kobuchwepheshe bokulungisa iphethini yenjoloba ye-silicone, ukuthuthukiswa kobuchwepheshe be-silicone resin kuhamba kancane, futhi impumelelo enkulu yezobuchwepheshe imbalwa.Kusukela eminyakeni engaba ngu-20 edlule, ngenxa yentuthuko yezobuchwepheshe yama-polymers anephunga elimnandi le-heterocyclic ukumelana nokushisa, amanye awo ayesetshenziswa ekuqaleni emkhakheni we-silicone resin.Kodwa-ke, ubuthi be-solvent nezimo ezinzima zokuphulukisa zama-polymers anephunga elimnandi we-heterocyclic ukumelana nokushisa kukhawulele ukusetshenziswa kwazo.Eminyakeni yamuva, abantu baqala ukunaka kakhulu ucwaningo nokuthuthukiswa kwe-silicone resin.I-silicone resin inebanga lokushisa elibanzi nokumelana nokuguga.Ukusebenza kanye nokusebenza kobufakazi bomswakama we-hydrophobic kuhle nezinye izinzuzo ezivelele, kunezimpawu zokuthi i-silicone resin ingase ibe nesikhala esikhulu sokuthuthukiswa esikhathini esizayo.

2. I-resin evamile ye-silicone

2.1 inqubo yokukhiqiza ye-resin ejwayelekile ye-silicone

Izinhlobo ezahlukene zama-silicone zinezisetshenziswa zokusetshenziswa ezihlukile nezindlela zokwenziwa.Kuleli phepha, inqubo yokukhiqiza yezinhlobo eziningana zama-silicone resins yethulwa nje.

2.1.1 i-silicone ye-methyl

2.2.1.1 ukuhlanganiswa kwe-methylsilicone resin kusuka ku-methylchlorosilane

I-Methylsilicones ihlanganiswa ne-methylchlorosilane njengento eyinhloko eluhlaza.Ngenxa yesakhiwo esihlukile nokwakheka kwama-silicone (idigri yokuxhumanisa yama-silicone, okungukuthi, [CH3] / [Si] value), izimo ezihlukene zokuhlanganisa ziyadingeka.

Lapho i-R / Si ephansi ([CH3] / [Si] ≈ 1.0) i-methyl abicah resin ihlanganiswa, isivinini sokuphendula se-hydrolysis kanye ne-condensation se-monomers yempahla eluhlaza eyinhloko i-methyltrichlorosilane siyashesha kakhulu, futhi izinga lokushisa lokusabela kufanele lilawulwe ngokuqinile ngaphakathi kuka-0 ℃ , futhi ukusabela kufanele kwenziwe ku-solvent ehlanganisiwe, futhi isikhathi sokugcina somkhiqizo wokusabela ekamelweni lokushisa yizinsuku ezimbalwa kuphela.Lolu hlobo lomkhiqizo lunenani elincane elingokoqobo.

Ekuhlanganisweni kwe-R / Si methylsilicone resin, i-methyltrichlorosilane ne-dimethyldichlorosilane isetshenziswa.Nakuba ukusabela kwe-hydrolytic condensation yengxube ye-methyltrichlorosilane ne-dimethyldichlorosilane ihamba kancane kunaleyo ye-methyltrichlorosilane iyodwa, isivinini se-hydrolytic condensation re-methyltrichlorosilane ne-dimethyldichlorosilane sihluke kakhulu, okuvamise ukubangelwa ukufiphala kwe-hydrolytic kwe-methyltrichlorosilane in advance.I-hydrolyzate ayihambisani nesilinganiso sama-monomers amabili, futhi i-methyl chlorosilane ivamise ukufakwa nge-hydrolyzed ukuze yakhe ijeli yasendaweni yokuxhumanisa, okuholela emazingeni ampofu aphelele e-methyl silicone resin etholwe ku-hydrolysis ye-monomer emithathu.

2.2.1.2 ukuhlanganiswa kwe-methylsilicone evela ku-methylalkoxysilane

Izinga lokusabela le-hydrolysis condensation ye-methylalkoxysilane lingalawulwa ngokushintsha izimo zokusabela.Kusukela ku-methylalkoxysilane, i-methylsilicone resin enamadigri ahlukene okuxhumanisa ingahlanganiswa.

Ama-methylsilicones ezentengiselwano anezinga elilinganiselwe lokuxhumanisa ([CH3] / [Si] ≈ 1.2-1.5) alungiswa kakhulu yi-hydrolysis kanye ne-condensation ye-methylalkoxysilane.Ama-monomers e-methyltriethoxysilane kanye ne-dimethyldiethoxysilane ecwengisiswe ngokususwa kwe-acidification axutshwe namanzi, engezwe ne-trace hydrochloric acid noma inani elifanele le-acid cation exchange resin eqinile (umphumela we-catalysis we-macroporous acid ion exchange resin ungcono), futhi aphile.Ubumba lwezocansi (olomisiwe ngemva kokwenziwa kwe-asidi) lusetshenziswa njenge-catalyst, i-heaters kanye ne-hydrolyzed.Uma isiphetho sesifinyelelwe, engeza inani elifanele le-hexamethyldisilazane ukuze unciphise i-catalyst hydrochloric acid, noma uhlunge inhlaka yokushintshanisa i-ion noma ubumba olusebenzayo olusetshenziswa njengesisusa sokunqamula ukusabela kokujiya.Umkhiqizo otholiwe yisisombululo sotshwala se-methylsilicone resin.

2.2.2 methyl phenyl abicah

Izinto zokusetshenziswa eziyinhloko zokukhiqizwa kwezimboni ze-methylphenyl silicone resin yi-methyltrichlorosilane, dimethyldichlorosilane, Phenyltrichlorosilane kanye ne-Diphenyldichlorosilane.Amanye noma wonke ama-monomers angenhla anezelwa ne-solvent toluene noma i-xylene, ixutshwe ngesilinganiso esifanele, iphonswa emanzini ngaphansi kokuyaluza, izinga lokushisa elilawulwa ukusabela kwe-hydrolysis, kanye ne-HCl (i-hydrochloric acid aqueous solution), okuwumkhiqizo wokusabela, kuyasuswa. ngokugeza ngamanzi.Isixazululo se-silicone se-hydrolyzed siyatholakala, bese ingxenye ye-solvent ihwamukile ukuze yenze i-silicone alcohol egxilile, bese i-silicone resin ilungiswa ngokushisa okubandayo noma ukusabela kwe-heat condensation, futhi i-resin eqediwe ye-silicone itholakala ngokuhlunga nokupakisha.

2.2.3 inhloso evamile ye-methyl phenyl vinyl silicone resin kanye nezingxenye zayo ezihlobene

Inqubo yokukhiqiza ye-methyl phenyl vinyl silicone resin ifana neye-methyl phenyl silicone resin, ngaphandle kokuthi ngaphezu kwe-methyl chlorosilane kanye ne-phenyl chlorosilane monomers, inani elifanele le-methyl vinyl dichlorosilane namanye ama-vinyl aqukethe ama-silicone monomers afakwa ku-hydrolysis eluhlaza. izinto zokwakha.Ama-monomers axubile ayenziwa nge-hydrolyzed, ahlanjululwe futhi agxilwe ukuze athole i-silanol egxilile ye-hydrolyzed, enezela i-metal organic acid salt catalyst, ukushisa okunciphisayo kuya ku-viscosity echazwe ngaphambilini, noma ukulawula iphuzu lokugcina lokuphendula kwe-condensation ngokusho kwesikhathi se-gelation, nokulungiselela i-methyl phenyl vinyl resin silicone.

I-Methylphenyl hydropolysiloxane, esetshenziswa njengengxenye ye-crosslinker ngaphezu kokusabela kwe-methylphenyl vinyl silicone resin, ngokuvamile iyindandatho noma i-polymer eqondile enezinga elincane le-polymerization.Akhiqizwa nge-hydrolysis kanye ne-cyclization ye-methylhydrodichlorosilane, noma nge-CO hydrolysis kanye ne-condensation ye-methylhydrodichlorosilane, i-Phenyltrichlorosilane ne-trimethylchlorosilane.

2.2.4 abicah eguquliwe

Ukukhiqizwa kokuhlanganisa i-silicone resin eguquliwe ne-organic resin ngokuvamile ku-toluene noma i-xylene isisombululo se-methylphenyl silicone resin, enezela i-alkyd resin, i-phenolic resin, i-acrylic resin nezinye izinsalela eziphilayo, ukuxuba ngokugcwele ngokulinganayo ukuze uthole umkhiqizo ophelile.

I-copolymerized modified silicone resin ilungiswa ngochungechunge lokusabela kwamakhemikhali.Ama-organic resin angahlanganiswa nge-silicone ahlanganisa i-polyester, i-epoxy, i-phenolic, i-melamine formaldehyde, i-polyacrylate, njll. Izindlela ezihlukahlukene zokwenziwa zingasetshenziswa ukulungisa i-copolymerized silicone resin, kodwa indlela esebenza kakhulu yokukhiqiza yezimboni i-copolymerization ye-silicone utshwala kanye i-organic resin.Okungukuthi, i-hydrolysis ye-methyl chlorosilane kanye ne-phenyl chlorosilane monomers ndawonye ukuze kutholwe isisombululo sotshwala se-silicon e-hydrolyzed noma isixazululo esigxilisiwe, bese wengeza i-prepolymer ye-organic resin ehlanganisiwe ku-catalyst, bese uhlanganisa i-co heat evaporation solvent, wengeza i-zinc, i-zinc naphthenate nezinye izisusa, kanye nokusabela kwe-cocodensation ekushiseni kwe-150-170 degree, kuze kube yilapho izinto zokusabela zifinyelela i-viscosity efanele noma isikhathi esinqunyiwe se-gelation, ukupholisa, Ukwengeza i-solvent ukuze incibilike futhi isihlungi ukuthola umkhiqizo ophelile we-copolymerized silicone resin.