PTFE bụ ama maka kemịkalụ inertness ya - nke a na-akpọkarị 'Eze Plastics.' Ọ na-eguzogide ihe fọrọ nke nta ka ọ bụrụ acid niile, alkalis na ihe mgbaze na okpomọkụ. Otú ọ dị, 'ihe fọrọ nke nta ka ọ bụrụ ihe niile' abụghị ihe niile.' N'okpuru ọnọdụ dị oke egwu - oke okpomọkụ, nnukwu ntinye uche, ma ọ bụ na ọnọdụ mgbaze - ụfọdụ chemicals nwere ike ịwakpo PTFE. Ma ọbụlagodi mgbe PTFE n'onwe ya dị ndụ, mkpụrụ osisi fiberglass dị n'okpuru nwere ike ịdị mfe ma ọ bụrụ na mkpuchi ahụ nwere ntụpọ.
Ịghọta oke ndị a dị oke mkpa maka ịhọrọ akwa PTFE na gburugburu kemịkalụ siri ike.
Aokai PTFE anwalela akwa mkpuchi PTFE megide kemịkalụ ike. Ntuziaka a na-akọwa ihe na-emebi PTFE ozugbo, ihe na-awakpo mkpụrụ osisi fiberglass na otu esi ezere ọdịda.
Kedu ka nrụrụ si eme - Usoro abụọ
PTFE elu-okpomọkụ ákwà mejupụtara abụọ akụkụ: a PTFE mkpuchi (mkpa, na-abụghị stick, chemically inert) na a fiberglass mkpụrụ (na-enye ike ma ọ bụ ngwangwa ụfọdụ chemicals). Corrosion na-apụta n'ụzọ abụọ:
1. Mbipu ozugbo nke mkpuchi PTFE
Nke a na-eme naanị n'okpuru ọnọdụ dị oke egwu - oke okpomọkụ, oke itinye uche, ma ọ bụ na ọnọdụ mgbaze. N'ebe okpomọkụ dị n'ime ụlọ, PTFE fọrọ nke nta ka ọ bụrụ ihe na-adịghị egbochi mwakpo kemịkal.
2. Corrosion nke mkpụrụ osisi fiberglass site na ntụpọ mkpuchi
Chemicals na-abanye n'ime pinholes, scratches, ma ọ bụ obere mgbawa na mkpuchi PTFE wee wakpo eriri iko. PTFE n'onwe ya ka nwere ike ịdị mma, mana akwa ahụ na-efunahụ ike igwe ma nwee ike dọka ngwa ngwa. Nke a bụ ọnọdụ ọdịda na-emekarị mgbe mkpuchi mebiri emebi.
Chemicals na-awakpo mkpuchi PTFE ozugbo
Ihe ndị a na-emeghachi omume na PTFE n'onwe ya, mana ọ bụ naanị n'okpuru ọnọdụ dị oke egwu.
1. Ọla alkali a wụrụ awụ - nke kachasị ahụkarị
sodium a wụrụ awụ (Na), potassium (K), na lithium (Li) na-ewepụ atom fluorine sitere na PTFE, na-eme ka carbonization, ngbanwe ojii, na ntụ ntụ nke elu ihe. Ihe ngwọta sodium-naphthalene ejiri maka PTFE etching na-arụ ọrụ na ụkpụrụ a.
Mmetụta: Nbibi zuru oke nke nhazi PTFE.
Ọnọdụ: Mkpughe ọ bụla na ọla alkali a wụrụ awụ (n'elu ebe mgbaze ha, dịka, Na na 98°C).
Nkwanye: Zere kpamkpam. Jiri ihe nkiri PTFE dị ọcha naanị ma ọ bụrụ na ọ dị oke mkpa, na ọbụlagodi na ịkpachara anya.
2. Ndị na-emepụta fluorinating siri ike na okpomọkụ dị elu
Ihe ndị a nwere ike decompose ọzọ PTFE n'okpuru nnukwu okpomọkụ:
Fluorine gas (F₂): Na-ebute corrosion nke nta nke nta na oke okpomọkụ na nrụgide.
Interhalogen fluorides: Chemicals na-arụ ọrụ nke ukwuu dị ka chlorine trifluoride (ClF₃) na bromine pentafluoride (BrF₅) nwere ike ịkpalite mmeghachi omume siri ike ma ọ bụ ọbụna combustion nke PTFE na oke okpomọkụ.
Fluorides siri ike oxidizing: Dịka ọmụmaatụ, xenon difluoride (XeF₂).
Nkwanye: Debe akwa PTFE na kemịkalụ ndị a, ọkachasị na okpomọkụ dị elu.
3. alkalis siri ike gbazere na okpomọkụ dị elu
Molten sodium hydroxide (NaOH) na potassium hydroxide (KOH) ji nwayọọ nwayọọ na-emebi elu PTFE n'elu 300 ° C, na-eduga ná mfu nke hydrophobicity na elu gloss. N'okpuru 300 Celsius C, PTFE na-eguzogide alkalis nke ọma. Na okpomọkụ ụlọ, enweghị mmetụta.
4. Reactive metal powders na elu okpomọkụ
Magnesium ntụ ntụ (Mg), aluminom ntụ ntụ (Al), na ihe ndị yiri ya na-emeghachi omume ike na PTFE na okpomọkụ dị elu, na-emepụta fluorides ígwè na carbon. Nke a bụ ihe ndabere maka ụfọdụ pyrotechnic na ihe na-ere ọkụ nwere PTFE.
Chemicals nke na-awakpo mkpụrụ osisi fiberglass site na ntụpọ mkpuchi
Chemicals ndị a anaghị emeghachi omume na PTFE, mana ọ bụrụ na mkpuchi PTFE nwere pinhole, ọkọ, ma ọ bụ mkpughe ọ bụla, ha ga-abanye ma bibie fiberglass.
1. Hydrofluoric acid (HF) - kasị dị ize ndụ
Hydrofluoric acid na-emebi nke ukwuu na fiberglass. Ọ na-eme ngwa ngwa na silicon dioxide (nke bụ isi ihe dị na iko) iji mepụta gas silicon tetrafluoride, na-agbari eriri iko.
PTFE n'onwe ya na-eguzogide HF n'ụzọ zuru oke - PTFE na-ejikarị eme ihe maka akụrụngwa ejizi HF.
Otú ọ dị, ákwà mkpuchi PTFE adịghị mma maka HF ọ gwụla ma mkpuchi ahụ enweghị ihe ọ bụla (nke na-esiri ike ikwenye). Nrụrụ ọ bụla ga-ekwe ka HF banye n'ime fiberglass, na-akpata ọdịda akwa ngwa ngwa.
Nkwanye: Maka ọrụ HF, jiri ihe nkiri PTFE dị ọcha (enweghị nkwado fiberglass) ma ọ bụ ihe mkpuchi PTFE zuru ezu nke nwere oghere efu enwetara.
2. alkalis na-etinye uche na okpomọkụ dị elu
Ihe ngwọta sodium hydroxide (NaOH) gbadoro anya nke ukwuu na okpomọkụ dị elu nwere ike imebi fiberglass site na ezughị okè mkpuchi. Okpomọkụ ụlọ, alkalis dilute dị mma.
3. Acid phosphoric na-etinye uche na oke okpomọkụ
Mkpakọrịta ogologo oge na acid phosphoric na-ekpo ọkụ ga-eme ka corrosion dị na fiberglass. Ọzọ, PTFE n'onwe ya na-eguzogide ya, ma mkpuchi mkpuchi bụ ebe adịghị ike.
Ihe ncheta dị mkpa maka ọrụ kemịkalụ
1. Ọtụtụ ọdịda sitere n'ike n'ike ma ọ bụ ịka nká, ọ bụghị ọgụ kemịkal
Na-ahụkarị ulo oru ngwa (chemical osisi, nri nhazi, wdg), PTFE ákwà ada n'ihi abrasion, dọka, ma ọ bụ okpomọkụ mmebi ogologo oge tupu chemical corrosion aghọ ihe iseokwu. Inertness kemịkalụ nke PTFE bụ ezigbo ma bụrụ nke a pụrụ ịdabere na ya maka ihe fọrọ nke nta ka ọ bụrụ kemịkalụ niile a na-ahụkarị ruo 260 Celsius.
2. Ọ bụrụ na ị ga-edozi kemịkalụ ike ike, jiri ihe nkiri PTFE dị ọcha
Maka ngwa ndị metụtara ọla alkali a wụrụ awụ, HF na-ekpo ọkụ, ma ọ bụ ihe na-eme ka fluorinating siri ike, a naghị atụ aro fiberglass mkpuchi PTFE . Kama, jiri:
Ihe nkiri PTFE dị ọcha (skived ma ọ bụ nkedo) na-enweghị nkwado fiberglass
igwe ejiri PTFE Ngwa
PFA ma ọ bụ FEP (Fluoropolymers ndị ọzọ nwere nguzogide yiri ya mana ụdị ọrụ dị iche iche)
3. Nwalee mgbe niile tupu ojiji zuru oke
Ọ bụrụ na ngwa gị gụnyere kemịkalụ edepụtaghị dị ka 'nchekwa' na chaatị ndakọrịta ọkọlọtọ, mee nnwale ndakọrịta ihe n'okpuru ọnọdụ ọrụ n'ezie (okpomọkụ, itinye uche, ogologo oge). Aokai PTFE nwere ike ịnye ihe nlele maka nkwado.
Aokai PTFE na-enye nduzi ndakọrịta kemịkalụ ma nwee ike ịkwado ngwaahịa kwesịrị ekwesị - akwa mkpuchi PTFE maka ọtụtụ ngwa, ma ọ bụ ihe nkiri PTFE dị ọcha maka ọrụ kemịkal dị oke. Kpọtụrụ anyị kemịkalụ, okpomọkụ na oge ikpughe.
