Nkhani

Pali mitundu yambiri ya organosilicon, yomwe silane coupling agents ndi crosslinking agents ndizofanana. Nthawi zambiri zimakhala zovuta kwa iwo omwe angokumana ndi organosilicon kuti amvetsetse. Kodi kugwirizana ndi kusiyana kotani pakati pa ziwirizi?
silane coupling agent
Ndi mtundu wa organic silicon pawiri yomwe ili ndi mitundu iwiri yosiyana ya mankhwala mu mamolekyu ake, omwe amagwiritsidwa ntchito kuti apititse patsogolo mphamvu zenizeni zomangirira pakati pa ma polima ndi zinthu zopanda pake. Izi zitha kutanthawuza kuwongolera kwa kumamatira kowona komanso kukulitsa kunyowa, rheology, ndi zina zogwirira ntchito. Ma coupling agents atha kukhalanso ndi zotsatira zosintha pamawonekedwe amderali kuti apititse patsogolo malire pakati pa magawo a organic ndi inorganic.
Chifukwa chake, ma silane coupling agents amagwiritsidwa ntchito kwambiri m'mafakitale monga zomatira, zokutira ndi inki, mphira, kuponyera, magalasi a fiberglass, zingwe, nsalu, mapulasitiki, zodzaza, zochizira pamwamba, ndi zina zambiri.

Ma silane coupling agents ambiri ndi awa:
Sulfure yokhala ndi silane: bis – [3- (triethoxysilane) - propyl] – tetrasulfide, bis – [3- (triethoxysilane) – propyl] – disulfide
Aminosilane: gamma aminopropyltriethoxysilane, N – β – (aminoethyl) – gamma aminopropyltrimethoxysilane
Vinylsilane: Ethylenetriethoxysilane, Ethylenetrimethoxysilane
Epoxy silane: 3-glycidoxypropyltrimethoxysilane

Methacryloyloxysilane: gamma methacryloyloxypropyltrimethoxysilane, gamma methacryloyloxypropyltriisopropoxysilane

Njira yogwiritsira ntchito silane coupling agent:
Silane crosslinking agent
Silane yomwe ili ndi magulu awiri kapena angapo ogwira ntchito ya silicon imatha kukhala ngati cholumikizira pakati pa mamolekyu amtali, kulola mamolekyu angapo amzere kapena ma macromolecules ocheperako kapena ma polima kuti azilumikizana ndikudutsana mumtundu wa maukonde amitundu itatu, kulimbikitsa kapena kuyanjanitsa mapangidwe a covalent kapena ayoni. pakati pa maunyolo a polima.
Crosslinking agent ndiye gawo lalikulu la chipinda chimodzi cha kutentha kwa mphira wa silicone, ndipo ndiye maziko owunikira njira yolumikizirana ndikuyika mayina azinthu.
Malinga ndi zinthu zosiyanasiyana za condensation reaction, limodzi chigawo kutentha chipinda vulcanized silikoni mphira akhoza m'gulu la mitundu yosiyanasiyana monga deacidification mtundu, ketoxime mtundu, dealcoholization mtundu, deamination mtundu, deamidation mtundu, ndi deacetylation mtundu. Pakati pawo, mitundu itatu yoyambirira ndizinthu zomwe zimapangidwa pamlingo waukulu.

Kutengera methyltriacetoxysilane crosslinking wothandizira mwachitsanzo, chifukwa cha condensation reaction product kukhala acetic acid, imatchedwa deacetylated chipinda kutentha vulcanized silikoni mphira.
Nthawi zambiri, ma crosslinking agents ndi ma silane coupling agents ndi osiyana, koma pali zosiyana, monga ma alpha series silane coupling agents omwe amaimiridwa ndi phenylmethyltriethoxysilane, omwe akhala akugwiritsidwa ntchito kwambiri mu gawo limodzi lokhala ndi kutentha kwachipinda komwe kumatulutsa mphira wa silikoni.

Common silane crosslinkers ndi awa:

Silane yopanda madzi: alkyltriethoxyl, methyltrimethoxy
Mtundu wa deacidification silane: triacetoxy, propyl triacetoxy silane
Ketoxime type silane: Vinyl tributone oxime silane, Methyl tributone oxime silane