Ka noiʻi a me ka hoʻomohala ʻana o dimethyldiethoxysilane

Hoʻohana nui ʻia ka resin silicone solution ma ke ʻano he polymer kumu o ka uhi ʻana i ka wela, ka uhi ʻana i ka wā a me nā mea hoʻonaninani uila kiʻekiʻe.

1.2 hoʻomohala ʻenehana o ka resin silicone

Ma waena o nā ʻano polymers silicone āpau, ʻo ka resin silicone kahi ʻano huahana silicone synthesized a hoʻohana mua ʻia. Ke hoʻohālikelike ʻia me ka hoʻomohala kiʻekiʻe o ka ʻenehana hoʻoponopono hou ʻana i ka ʻenehana silicone rubber, ʻoi aku ka lohi o ka hoʻomaikaʻi ʻana i ka ʻenehana o ka resin silicone, a he liʻiliʻi nā mea ʻenehana nui. Mai kahi o 20 mau makahiki i hala aku nei, ma muli o ka holomua ʻenehana o nā polymers wela wela heterocyclic aromatic, ua hoʻohana mua ʻia kekahi o lākou i ke kahua o ka resin silicone. Eia nō naʻe, ʻo ka mea ʻawaʻawa a me nā kūlana hoʻōla paʻakikī o nā polymers pale wela heterocyclic aromatic i kaupalena i kā lākou noi. I nā makahiki i hala iho nei, ua hoʻomaka ka poʻe e uku nui i ka noiʻi a me ka hoʻomohala ʻana i ka resin silicone. ʻO ka resin silicone he ākea ākea ākea a me ke kūpaʻa ʻelemakule. He maikaʻi ka hana a me ka hydrophobic moisture-proof a me nā mea maikaʻi ʻē aʻe, aia nā hōʻailona e loaʻa paha i ka resin silicone kahi wahi hoʻomohala nui i ka wā e hiki mai ana.

2. ʻO ka resin silicone maʻamau

2.1 kaʻina hana o ka resin silicone maʻamau

Loaʻa nā ʻano mea like ʻole o nā silicones i nā mea maka a me nā ala synthetic. Ma kēia pepa, ua hoʻokomo wale ʻia ke kaʻina hana o nā ʻano resins silicone.

2.1.1 methyl silicone

2.2.1.1 synthesis o ka methylsilicone resin mai ka methylchlorosilane

Hoʻopili ʻia nā Methylsilicones me ka methylchlorosilane ma ke ʻano he kumu kumu. Ma muli o ke ʻano ʻokoʻa a me ke ʻano o nā silicones (ke degere crosslinking o silicones, ʻo ia hoʻi, [CH3] / [Si] waiwai), pono nā ʻano synthesis like ʻole.

Ke hoʻohui ʻia ka haʻahaʻa R / Si ([CH3] / [Si] ≈ 1.0) methyl silicone resin, ʻoi aku ka wikiwiki o ka hydrolysis a me ka condensation reaction speed o ka mea nui monomers methyltrichlorosilane, a pono e hoʻomalu pono ʻia ka mahana hopena i loko o 0 ℃ , a pono e hoʻokō ʻia ka hopena i loko o kahi mea hoʻoheheʻe hui, a ʻo ka manawa mālama o ka huahana hopena ma ka lumi wela he mau lā wale nō. He liʻiliʻi ka waiwai kūpono o kēia ʻano huahana.

I ka synthesis o R / Si methylsilicone resin, hoʻohana ʻia ka methyltrichlorosilane a me ka dimethyldichlorosilane. ʻOiai ʻoi aku ka lohi o ka hopena condensation hydrolytic o ka hui ʻana o ka methyltrichlorosilane a me ka dimethyldichlorosilane ma mua o ka methyltrichlorosilane wale nō, ʻokoʻa loa ka wikiwiki o ka condensation condensation hydrolytic o methyltrichlorosilane a me dimethyldichlorosilane, ka mea i hana pinepine ʻia e ka hydrolytic condensation o methyltrichlorosilane ma mua. ʻAʻole kūlike ka hydrolyzate me ka ratio o nā monomers ʻelua, a ua hoʻoheheʻe pinepine ʻia ka methyl chlorosilane e hana i kahi gel crosslinking kūloko, e hopena ana i nā waiwai piha o ka resin methyl silicone i loaʻa mai ka hydrolysis o ka monomer ʻekolu.

2.2.1.2 hoʻohui ʻia o ka methylsilicone mai ka methylalkoxysilane

Hiki ke ho'omalu 'ia ka hopena o ka hydrolysis condensation o ka methylalkoxysilane ma ka ho'ololi 'ana i nā kūlana ho'ololi. E hoʻomaka ana mai ka methylalkoxysilane, hiki ke synthesized ka methylsilicone resin me nā degere crosslinking like ʻole.

ʻO nā methylsilicones pāʻoihana me ka pae haʻahaʻa o ka crosslinking ([CH3] / [Si] ≈ 1.2-1.5) i hoʻomākaukau nui ʻia e ka hydrolysis a me ka condensation o methylalkoxysilane. Hoʻohui ʻia nā monomers o ka methyltriethoxysilane a me ka dimethyldiethoxysilane i hoʻomaʻemaʻe ʻia e ka deacidification me ka wai, hoʻohui ʻia me ka trace hydrochloric acid a i ʻole ka nui kūpono o ka resin hoʻololi cation acid ikaika (ʻoi aku ka maikaʻi o ka hopena catalysis o macroporous strong acid ion exchange resin), a ola. Hoʻohana ʻia ka pālolo moe (maloʻo ma hope o ka acidification) ma ke ʻano he catalyst, wela a hydrolyzed. Ke hiki i ka hopena, hoʻohui i ka nui kūpono o ka hexamethyldisilazane e hoʻopau i ka ʻakika hydrochloric catalyst, a i ʻole kānana i ka resin hoʻololi ion a i ʻole ka pālolo ikaika i hoʻohana ʻia ma ke ʻano he catalyst e hoʻopau i ka hopena condensation. ʻO ka huahana i loaʻa he hopena waiʻona o ka resin methylsilicone.

2.2.2 methyl phenyl silicone

ʻO nā mea waiwai nui no ka hana ʻenehana o ka methylphenyl silicone resin he methyltrichlorosilane, dimethyldichlorosilane, Phenyltrichlorosilane a me Diphenyldichlorosilane. Hoʻohui ʻia kekahi a i ʻole nā ​​mea a pau o nā monomer i luna me ka toluene a i ʻole xylene solvent, i hui pū ʻia ma ke ʻano kūpono, hoʻokuʻu ʻia i loko o ka wai ma lalo o ka hoʻouluulu, mālama ʻia ka mahana no ka hopena hydrolysis, a me HCl (hydrochloric acid aqueous solution), ka hopena o ka hopena, wehe ʻia. ma ka holoi wai. Loaʻa ka hopena silicone hydrolyzed, a laila e hoʻoheheʻe ʻia kahi ʻāpana o ka solvent e hana i ka waiʻona silicone concentrated, a laila hoʻomākaukau ʻia ka resin silicone e ka condensation anuanu a i ʻole ka hopena condensation wela, a loaʻa ka resin silicone i hoʻopau ʻia ma o ka kānana a me ka hoʻopili.

2.2.3 kumu nui methyl phenyl vinyl silicone resin a me kona mau mea pili

ʻO ke kaʻina hana o ka methyl phenyl vinyl silicone resin e like me ka methyl phenyl silicone resin, koe wale nō ka hoʻohui ʻana i ka methyl chlorosilane a me phenyl chlorosilane monomers, ua hoʻohui ʻia ka nui o ka methyl vinyl dichlorosilane a me nā vinyl ʻē aʻe i loko o nā monomers silicone i loko o ka hydrolysis raw. mea waiwai. Ua hydrolyzed nā monomers i hui ʻia, holoi ʻia a hoʻopaʻa ʻia no ka loaʻa ʻana o ka silanol hydrolyzed concentrated, hoʻohui i ka metala organik waika paʻakai catalyst, decompressing wela i predefined viscosity, a i ʻole ke kāohi ʻana i ka hopena hopena condensation e like me ka manawa gelation, a me ka hoʻomākaukau ʻana i ka methyl phenyl vinyl silicone resin.

ʻO ka Methylphenyl hydropolysiloxane, ka mea i hoʻohana ʻia ma ke ʻano he ʻāpana o ka crosslinker me ka hoʻohui ʻana o ka methylphenyl vinyl silicone resin, maʻamau he apo a linear polymer me ka liʻiliʻi o ka polymerization. Hana ʻia lākou e ka hydrolysis a me ka cyclization o methylhydrodichlorosilane, a i ʻole e CO hydrolysis a me ka condensation o methylhydrodichlorosilane, Phenyltrichlorosilane a me trimethylchlorosilane.

2.2.4 hoʻololi silicone

ʻO ka hana ʻana o ka hui ʻana i ka resin silicone i hoʻololi ʻia me ka resin organik ka mea maʻamau i loko o toluene a i ʻole xylene solution o methylphenyl silicone resin, hoʻohui i ka resin alkyd, resin phenolic, resin acrylic a me nā resins organik ʻē aʻe, e hui pū ʻia e kiʻi i ka huahana i pau.

Hoʻomākaukau ʻia ka resin silicone copolymerized i hoʻololi ʻia e kahi ʻano o nā hopena kemika. ʻO nā resins organik i hiki ke copolymerized me ka silicone, ʻo ia ka polyester, epoxy, phenolic, melamine formaldehyde, polyacrylate, etc. Hiki ke hoʻohana ʻia nā ʻano ala synthetic no ka hoʻomākaukau ʻana i ka resin silicone copolymerized, akā ʻo ke ʻano hana hana ʻoihana ʻoi aku ka copolymerization o ka waiʻona silicone a mea hoʻohalahala. ʻO ia hoʻi, ka hydrolysis o ka methyl chlorosilane a me ka phenyl chlorosilane monomers e loaʻa i ka hydrolyzed silicon alcohol solution a i ʻole concentrated solution, a laila hoʻohui i ka prepolymer resin organic pre synthesized i ka catalyst, a laila hui pū i ka co heat evaporation solvent, hoʻohui i ka zinc, zinc naphthenate a me nā catalysts, a me ka cocondensation pane ma 150-170 degere ka wela, a hiki i ka mea pane i ka viscosity pono. a i ʻole ka manawa gelation i koho mua ʻia, ka hoʻoluʻu, Hoʻohui i ka solvent e hoʻoheheʻe a kānana no ka loaʻa ʻana o ka huahana pau o ka resin silicone copolymerized.