Zvivharo zveSilicone zvave sarudzo yekutanga yenyanzvi nevanogadzira zvinhu zvakasiyana-siyana kana zvasvika pakusunga nzvimbo dzakasiyana-siyana. Zvivharo zveSilicone zvine hunhu hwakanaka hwekunamira uye hunyanzvi, zvichipa kugara kwenguva refu kwenguva refu kune zvakasiyana-siyana. Pakati pemhando dzezvivharo zvesilicone zvinotengeswa pamusika, zvivharo zvealkoxy silicone uye zvivharo zveacetoxy silicone ndidzo mhando mbiri dzakakurumbira. Munhau idzi, tichaongorora zvakadzama hunhu hwezvivharo izvi, zvakanakira nezvazvakaipira, uye tokubatsira kusarudza sarudzo yakanakisa yezvaunoda.
1. Kusiyana kwezvimiro:
Kutanga, ngationgororei musiyano uripo pakati pealkoxy neacetoxy. Boka realkoxy rine boka realkyl (R-) rakabatana neatomu yeokisijeni (-O-). Chaizvoizvo, musanganiswa weboka realkyl neokisijeni.
Mune rumwe rutivi, acetoxy inobva kuacetic acid. Inosanganisira boka reacetyl (CH3CO-) rakabatana neatomu yeokisijeni (-O-). Saka, acetoxy inogona kutorwa seboka realkyl rinotsiviwa neokisijeni mukati mechikamu cheacetyl.
Musiyano uripo muchimiro unotungamira mukusawirirana muhunhu hwemakemikari uye reactivity pakati pemapoka ealkoxy neacetoxy. Seboka rinoshanda re aliphatic, alkoxy inoratidza hunhu hwe nucleophilic uye mune dzimwe nguva inoshanda seboka rinobuda. Maitiro aya anonyanya kutsamira pakuzivikanwa uye zvinotsiva boka realkoxy rakabatana neatomu yeokisijeni. Sezvo mapoka ealkoxy asingashande zvakanyanya, electrophile yakasimba kana catalyst inodiwa kuti itange reaction.
Kusiyana neizvi, mapoka eacetoxy anoratidza reactivity yakasiyana nekuda kwekuvapo kwemapoka eacetyl. Acetyl moiety uye partial positive carbon yayo inobatsira pakugadzirwa kwe electrophilic kweboka reacetoxy. Nokudaro, boka reacetoxy rinobatanidzwa zvakanyanya mu acetylation reaction, richiendesa acetyl moiety kune mamwe mamorekuru. Acetylation reactions inowanikwa munzvimbo dzakasiyana-siyana mukugadzirwa kwemishonga, zvigadzirwa zvechisikigo uye organic compounds dzakasiyana-siyana.
2. Alkoxy silicone sealants: Kuburitsa mikana mitsva yekushandisa
Alkoxy silicone sealants imhando yealkoxy silicone sealants yakagadzirwa zvakanangana nehunyanzvi hwe alkoxy curing. Idzi sealants dzinozivikanwa nekugona kwadzo kubatana zvakanaka nemidziyo yakasiyana-siyana, kusanganisira girazi, ceramics, uye mamwe mapurasitiki. Kugona kwadzo kutsungiriratembiricha dzakakwirirauyedzivisa mwaranzi yeUVinoita kuti ive sarudzo yekutanga yekushandiswa panze. Pamusoro pezvo, alkoxylated silicone sealants ine zvakanaka kwazvokuramba kwemamiriro ekunze, zvichiita kuti pave nemigumisiro inogara kwenguva refu. Nekuda kwemodulus yakadererauye kuchinjika kwakanyanya, zvinogona kugamuchira kufamba kwemajoini, zvichiita kuti zvive zvakanaka pakushandiswa kwakasimba. Chimwe chinhu chakanaka chealkoxylated silicone sealants ndechekutihwema hushomapanguva yekucheneswa, izvo zvinoita kuti zvive nyore kushandisa munzvimbo dzakavharwa.
3. Zvivharo zveSilicone zveAcetoxy: Zvakaedzwa uye Zvakaedzwa
Kune rumwe rutivi, ma sealant e-acetoxy silicone anoshandisa tekinoroji yekurapa acetoxy. Ma sealant aya ave achishandiswa zvakanyanya kwemakumi emakore uye anozivikanwa nehunyanzvi hwawo hwekuvhara hune simba. Anoumba hukama hwakasimba nezvinhu zvekuvaka zvakajairika, zvinosanganisira girazi, simbi uye ceramics. Ma sealant e-acetoxy silicone anozivikanwa nekupora nekukurumidzauye zvakanakisakuramba hunyoroKurapa uku nekukurumidza kunoita kuti mapurojekiti akurumidze uye ave nyore. Zvisinei, ziva kuti acetoxy silicone sealants inogona kuburitsa hwema hwakaita sevhiniga painopora, saka kufefetera kwakakwana kwakakosha.
4.Sarudza silicone sealant chaiyo
Kunzwisisa hunhu hwakasiyana hwemhando yega yega yesilicone sealant kwakakosha pakuita sarudzo ine ruzivo. Zvinhu zvakaita sekusimba kwebond, kugona kwebond, nguva yekuporesa, kuchinjika, hwema uye zvinodiwa zvepurojekiti zvinofanirwa kutariswa. Kana kuramba mwaranzi yeUV, tembiricha yakanyanya uye mamiriro ekunze ari panze kwakakosha, alkoxylated silicone sealants zvinowanzo shandiswa. Acetoxy silicone sealants ine hunhu hwekukurumidza kupora uye isarudzo yakanaka kumapurojekiti anoda nguva yekukurumidza kutendeuka uye bond yakasimba yekutanga. Zvakare, zvakakosha kuziva kuti mhando dzese dzesealants dziripo mumavara akasiyana-siyana, zvichipa sarudzo dzerunako kune zvishandiso zvinoda kupedzisa kwakanaka.
Mhedziso
Pamwe chete, alkoxy neacetoxy silicone sealants zvinopa mabhenefiti akasiyana zvichienderana nezvinodiwa papurojekiti. Sarudzo yekupedzisira inoenderana nehunhu hwekunamira, nguva yekuporesa, kuchinjika, hwema uye zvinhu zvakatipoteredza. Tichifunga nezveruzivo rwuri munhau iyi, unogona kusarudza silicone sealant inonyatsokodzera zvaunoda.
Nguva yekutumira: Chikunguru-26-2023