Ndị na-emepụta akwa Teflon na-ekpo ọkụ na-arụtụ aka na nhazi ọnụego jụrụ oyi bụ ụzọ kachasị mma ma dị irè iji chịkwaa kristal. Mgbe PTFE gbazere kpamkpam n'elu 380 ° C, agbụ molekụla na-ahazi n'ime lattices kristal mgbe ị na-agafe oke oke kristal nke 310 ~ 315 Celsius C n'oge jụrụ oyi. Ọnụọgụ jụrụ oyi na-ekpebi oke mpaghara kristal na microscopic morphology nke mkpuchi.
1. Ngwa ngwa jụrụ oyi (quenching) maka obere crystallinity
A na-ajụkwa elu akwa akwa ahụ ngwa ngwa site na ákwà mgbochi ikuku oyi, igwe na-eme ka ọ dị jụụ ma ọ bụ tank mmiri na-ekpo ọkụ. A na-ajụ ụdọ molekụla ahụ tupu nhazi oge niile ma na-enye iwu, na-etolite ọnụ ọgụgụ buru ibu nke obere mkpụrụ kristal na ezughị oke. Ihe mkpuchi nke enwetara na-egosipụta udidi dị nro na ike siri ike na arụmọrụ kachasị mma na-adịghị arụ ọrụ, ebe ike ya na iyi ihe mgbochi na-ebelata ntakịrị.
2. Ịdị nwayọọ nwayọọ (annealing) maka nnukwu crystallinity
A na-ahazi ngalaba nchekwa ọkụ na mpụta nke ọkụ na-ekpo ọkụ, ma ọ bụ na-eji ọkụ na-eme ka ákwà ahụ dị jụụ na ngwa ngwa ngwa ngwa nke 10 ~ 50 ° C / h. Nke a na-enye ohere ijegharị agbụ molekụla zuru oke iji mepụta spherulites buru ibu na zuru oke. Ihe mkpuchi ahụ na-anya isi ike dị elu, nkwụsi ike na-eyi pụtara ìhè yana nkwụsi ike akụkụ, ma na-enwe mbelata mgbanwe yana mmụba na-agbaji.
II. Usoro inyeaka na njikwa ihe
N'ịdabere na nhazi ọnụego jụrụ oyi, usoro inyeaka ndị a nwere ike imeziwanye kristal nke mkpuchi PTFE.
1. Sintering okpomọkụ na ijide oge
A ghaghị ikpo ọkụ na 380 ~ 400 Celsius C ma jide ya maka oge zuru ezu iji gbazee kristal mbụ ma kpochapụ akụkọ ihe mere eme nke okpomọkụ. Nwepu nke ọma ga-ahapụ kristal kristal fọdụrụnụ, na-ebute kristal ikpeazụ gabiga oke oke na nke na-ezighi ezi.
2. Mgbe ọgwụgwọ annealing
Maka mkpuchi na kristal dị ala nke enwetara site na ngwa ngwa jụrụ oyi, uto kristal nke abụọ na mkpochapụ nrụgide dị n'ime nwere ike mezuo site na ọgwụgwọ okpomọkụ mgbe niile na 300 ~ 320 Celsius C ruo ọtụtụ awa na-esote nwayọ nwayọ, nke na-abawanye kristal mkpuchi.
3. Raw ihe molekụla arọ
High-molekul arọ PTFE dispersion atụmatụ elu gbazee viscosity na ala molekụla yinye ngagharị, na-eduga a iji nwayọọ crystallization ọnụego. N'okpuru otu ọnọdụ dị jụụ, ọ dị mfe ịkwadebe mkpuchi na obere crystallinity.
4. Mgbakwụnye ndị na-ahụ maka nuklia
Obere usoro onunu ogwu (0.1% ~ 1%) nke inorganic fillers ma ọ bụ copolymers perfluorinated nwere ike inye ọnụ ọgụgụ buru ibu nke kristal kristal dị iche iche ma na-anụcha ọka kristal nke ukwuu. Ọ bụ ezie na ọ nweghị ike ịgbanwe kristal zuru oke, ọ na-ebuli microstructure kristal nke ọma.
III. Nlekọta zuru oke maka mmepụta mkpuchi mkpuchi Multi-Layer
A na-emepụta akwa akwa teflon dị elu site na otutu impregnation na sintering na-eji nwayọọ nwayọọ na-akwakọba mkpuchi, na-achọ njikwa usoro ezubere iche dị ka ndị a.
1. Interlayer crystallization agbanwe agbanwe
Nnukwu nnukwu ọdịiche dị na ọnụego jụrụ oyi n'etiti ọkwa ga-eme ka kristal interlayer na-ekwekọghị ekwekọ ma na-ebute nrụgide dị n'ime, ọbụna na-eduga na peeling mkpuchi n'ọnọdụ ndị siri ike. A na-atụ aro ka ị nweta nju oyi dị nro maka ọkwa dị n'etiti, ma mejuputa ngwa ngwa ma ọ bụ ngwa ngwa jụrụ oyi naanị maka oyi akwa kachasị dị ka mmepụta ihe chọrọ.
2. Mkpuchi ọkpụrụkpụ mmetụta
Ihe mkpuchi dị oke njọ na-ata ahụhụ site na oyi na-adịghị na ya n'etiti elu na oyi akwa dị n'ime. Igwe oyi akwa dị n'ime na-eme ka ọ bụrụ kristal dị elu n'ihi nkwụsị ọkụ na-adịghị ngwa ngwa. Ọ dị mkpa ịgbatị oge ịgbatị n'ụzọ kwesịrị ekwesị iji hụ na otu okpomọkụ nke mkpuchi ahụ dum tupu emejuputa usoro nju oyi jikọtara ọnụ.
3. Esemokwu dakọtara n'oge jụrụ oyi
Esemokwu a na-etinye n'elu akwa akwa n'oge akụkụ jụrụ oyi na-emetụta nghazi nke ụdọ molekụla, nke ndị di na nwunye nwere usoro kristal na-ejikọta ọnụ na-ekpebi morphology ikpeazụ kristal na nkwụsi ike akụkụ. Achịkwa ahazi na njikwa ziri ezi bụ iwu.
IV. Nchọpụta ọnụọgụ nke Crystallinity
A ga-anabatarịrị calorimetry nyocha dị iche iche (DSC) iji nyochaa kristal mgbe emezigharị usoro. A 5 ~ 10mg mkpuchi sample na-ekpo ọkụ na a ọnụego nke 10 Celsius C / min iji nwalee agbaze enthalpy. A na-agbakọ crystallinity site n'ikewa agbaze agbaze enthalpy nwalere site na theoretical gbaze enthalpy nke 100% crystalline PTFE (ihe dị ka 82J/g). Ejikọtara ya na nkwụsi ike na-ehulata, iyi mkpuchi na ule arụmọrụ ndị ọzọ, enwere ike ikpebi windo usoro kachasị mma.
Ụkpụrụ ọrụ izugbe : Iji nweta kristal dị ala, mejuputa ngwa ngwa quenching mgbe ịmechara zuru ezu; Iji nweta kristal dị elu, na-edebe okpomọkụ mgbe niile ka ọ dị nso 310 Celsius C na-esote ya na-ajụ oyi nke ukwuu mgbe ọ gbasasịrị.
Maka ozi miri emi na paramita zuru ezu, ihe ndapụta ngwa na ngwọta ahaziri nke ngwaahịa anyị zuru oke gụnyere akwa Teflon dị elu, teepu nrapado dị elu nke Teflon, eriri igwe na-ekpo ọkụ na-ekpo ọkụ, eriri igwe na-enweghị nkebi, akwa PTFE nwere otu akụkụ, akwa akwa na-eguzogide ọgwụ, biko nwee mmetụta nke na-eguzogide eriri eriri na eriri glaze. anyị online ma ọ bụ kpọtụrụ anyị hotline ọrụ.
