Ebe mgbaze kristal nke PTFE bụ 327 ℃, mana resin ga-adị n'elu 380 ℃ ka ọ nọrọ na steeti gbazere.Na mgbakwunye, PTFE nwere nguzogide ihe mgbaze siri ike.Ya mere, ọ nweghị ike iji nhazi nhazi ma ọ bụ nhazi mgbasa.N'ozuzu, mmepụta nke ngwaahịa ya nwere ike ime naanị dịka nhazi ígwè na seramiiki.A na-agbakọ ntụ ntụ nke mbụ, wee kpoo ya ma kpụọ ya, ma ọ bụ kpụrụ ya site na extrusion, Isobaric na-akpụ, mkpuchi mkpuchi na calendering.
Ebe mgbaze kristal nke PTFE bụ 327 ℃, mana resin ga-adị n'elu 380 ℃ ka ọ nọrọ na steeti gbazere.Na mgbakwunye, PTFE nwere nguzogide ihe mgbaze siri ike.Ya mere, ọ nweghị ike iji nhazi nhazi ma ọ bụ nhazi mgbasa.N'ozuzu, mmepụta nke ngwaahịa ya nwere ike ime naanị dịka nhazi ígwè na seramiiki.A na-agbakọ ntụ ntụ nke mbụ, wee kpoo ya ma kpụọ ya, ma ọ bụ kpụrụ ya site na extrusion, Isobaric na-akpụ, mkpuchi mkpuchi na calendering.
Mkpọkọ ịkpụzi
Ịkpụzi mkpakọ kachaPTFE ịkpụzi nhaziusoro eji eme ihe ugbu a maka PTFE.Usoro ịkpụzi bụ usoro nke a na-etinye ihe ụfọdụ na-akpụzi (ntụ ntụ, pellets, ihe fibrous, wdg) na-etinye n'ụdị ígwè ma na-akpụzi ya na okpomọkụ na nrụgide.Ọ bụghị nanị n'ịdị arọ molekụla ya ka a na-ahazi polymer, na ihe fọrọ nke nta ka ọ bụrụ plastik niile nwere ike ịhazi ya site na ịkpụzi mkpakọ.Isi njirimara nke ịkpụzi mkpakọ bụ: ọnụ ala dị ala, ngwa dị mfe, ntinye ego dị ala, na ejedebeghị site na ịdị arọ nke molekụla nke plastik emeziri;ọghọm ndị ahụ bụ nrụpụta nrụpụta dị ala, oke ọrụ siri ike, yana ịdị mma ngwaahịa anaghị akwụsi ike.Ibu arọ molekụla nke PTFE dị elu nke ukwuu na mmiri mmiri adịghị oke njọ.Mgbe ụzọ nhazi ndị ọzọ akabeghị aka, mba ụwa na-ejikarị ịkpụzi mkpakọ iji hazie ngwaahịa PTFE.
A na-ekewa usoro mkpakọ kpọmkwem n'ime usoro ① press-sinter-press;② usoro mgbasa ozi sinter;③ usoro ikpo ọkụ ngwa ngwa;④ pịa na sinter n'out oge.
Hydroforming
A na-akpọkwa usoro hydraulic usoro nha anya na usoro nrụgide nha anya, nke bụ ịgbakwunye resin PTFE n'etiti akpa rọba na mgbidi ebu, wee gbanye mmiri mmiri (mmiri a na-ejikarị) n'ime akpa rọba, na akpa rọba nke na-emepụta. nrụgide na-agbasawanye na mgbidi ebu na kọmpat Resin na-aghọ usoro nke preforms.Enwere ike iji usoro a rụpụta nnukwu aka uwe, tankị nchekwa ala, shells hemispherical, ogidi ụlọ elu, nnukwu slabs, wdg, a pụkwara iji ya rụọ tees, elbows, profiled material, etc. na ihe nhazi PTFE jikọtara ọnụ.Ngwaahịa nwere ọdịdị dị mgbagwoju anya.Isi uru nke hydroforming bụ usoro dị mfe nke akụrụngwa na ebu.Igwe mgbapụta mmiri nkịtị na-edochi akwa akwa akwa.A na-ejikọta ngwaahịa a n'otu n'otu, nwere njupụta na-agbanwe agbanwe, nwere ike ịmepụta ihe ndị buru ibu, nwere ọdịdị dị mgbagwoju anya, na ihe mkpuchi dị mfe.
Ịkpụ akpụ
A na-akpọkwa ịkwanyemado extrusionịkpụzi.The 20-30 mesh sieved dispersing resin na-agwakọta ya na organic additives (toluene, petroleum ether, ihe mgbaze mmanụ, wdg, nkezi nke resin arọ bụ 1/5) ime ka tapawa.Tupu abịakọrọ n'ime a oké-walled gburugburu mfe oghere, mgbe ahụ, tinye ya n'ime pịa ihe onwunwe, na-eji a plunger na-etolite ya n'okpuru kpo oku.Mgbe ihicha, a na-agbanye ya na okpomọkụ nke 360 ~ 380C, na mgbe ọ dị jụụ, a na-enweta tube siri ike, mkpanaka na ngwaahịa ndị ọzọ.Ngwa ngwa ngwa na-ejedebe na mkpara nwere dayameta nke 16mm ma ọ bụ obere yana ọkpọkọ nwere ọkpụrụkpụ mgbidi nke 3mm ma ọ bụ obere.
Spiral extrusion ịkpụzi
Ihe nkedo nke PTFE ntụ ntụ dị iche na extruder eji eme ihe maka thermoplastics ndị ọzọ.Mkpụrụ akpụ nke Zengtong thermoplastics bụ ịkwalite ihe site na ntụgharị nke ịghasa, ebe ọ na-arụkwa ọrụ nke mkpakọ, ịkpacha ihe na ịgwakọta., A na-agbazekwa ihe ahụ site na ọkụ na-eme ka ike dị ike na ikpo ọkụ dị n'èzí nke ihe.Ihe nkedo nke PTFE ịghasa extruder naanị na-arụ ọrụ nke nnyefe na ịkwanye, nke mere na ihe ahụ na-agafe n'isi nke otu ihe nkedo extruder na-eji okpukpu abụọ, nha nha nha na omimi nha, wee banye n'ime anwụ maka sintering, jụrụ oyi. na ịkpụzi ya na nrụgide nke ngwaọrụ backpressure na-enye iji nweta nzube na-aga n'ihu.Mgbe ị na-ahazi PTFE na otu ịghasa extruder, a na-enwekarị nnukwu nsogbu.N'ihi na ọnụọgụ esemokwu nke PTFE ntụ ntụ dị nnọọ ala, ọ na-eme ka ọ ghara ịda mbà n'oge usoro nri, nke na-ebelata oke ikike ibufe ihe nkedo.Na mgbakwunye, n'ihi esemokwu na ọgbọ okpomọkụ, ntụ ntụ nwere ike ịrapara na ịghasa ma ọ bụ gbọmgbọm, na-eme ka nri sie ike na enweghị ntụkwasị obi.
N'ime afọ ndị na-adịbeghị anya, ejiriwo kposara ejima mee ihe na nhazi ihe nke ọdịdị pụrụ iche.Ụkpụrụ nri ya dị iche na nke ndị na-ebupụ otu ihe.Ọ nwere mmetụta dị mma na-ebuga ma nwee ike imeri nkwụsị nke ntụ ntụ UHMWPE na ịghasa.Mee ka ikike inye nri dịkwuo mma.N'ime ha, onye na-atụgharị ejima-screw extruder na-eme ka ọ dị mma na-agwakọta na mmetụta homogenization karịa otu ejima-screw extruder na-agbagharị agbagharị, ma n'ihi ike nkewa ya ka ukwuu, mmetụta nke ịkpụcha ihe dị na oghere nke ịghasa dị ukwuu, na-eme ka ihe ahụ kpoo ọkụ. na extrude.Enwere ike ibelata ịdị arọ molekụla nke ihe nrụpụta ihe dịka 40%.Ọ bụrụ na a na-eme ka ogige ahụ buru ibu ma kposara anaghị etinye aka, ihe ahụ ga-arapara na ígwè dị ọkụ.Otú ọ dị, iji co-na-atụgharị ejima-screw extruders enweghị nsogbu ndị dị n'elu.Mmetụta ịkpụ nke ihe dị na extruder dị ntakịrị, na okpomọkụ a chọrọ maka plasticization bụ ihe niile sitere na ebe ọkụ ọkụ dị n'èzí, n'ihi ya enwere ike ịchịkwa ya nke ọma ka e wee nwee ike ibelata oke ọkụ nke ihe ahụ n'oge usoro nkwụsị, na n'otu oge ahụ iji nọgide na-agba ọsọ nke ihe ndị dị na isi igwe bụ ihe nkịtị ma kwụsie ike, na nhazi nke akụkụ nke isi igwe kwesịrị ime ka ụda nke ihe na-ebufe site na nkedo.Ọsọ ntụgharị nke ịghasa enweghị ike ịdị ngwa ngwa, n'ozuzu gburugburu 10 mgbanwe kwa nkeji.Iji zere ihe onwunwe na mberede na-arapara n'elu metal ahụ, a ghaghị ịchịkwa okpomọkụ nke extrusion nke ọma.
Plunger extrusion ịkpụzi
Plunger extrusion ịkpụzi plastik bụ usoro ochie na nhazi rọba.Ebe ọ bụ na ihe eji plastik pụta, ndị mmadụ amalitela iji usoro a na-edozi plastik.Iji hazie PTFE na plunger extruder, a na-agbanye resin quantitative n'ime ebu ahụ, a na-atụgharị plunger ahụ, ma tinye ya n'ime preform.N'ụzọ dị otú a, a na-emepụta ọtụtụ preforms na anwụ.N'ihi esemokwu dị n'etiti resin PTFE na esemokwu dị n'etiti resin PTFE na mgbidi anwụ, a na-emepụta nguzogide.N'otu oge ahụ, mmụba olu nke preform mgbe sintered na anwụ na-emepụta nguzogide, nke mere na ọ bụ preform nke otu akụkụ.Sintering na jụrụ n'okpuru nrụgide na-etolite na-aga n'ihu dum.Uru nke usoro a bụ: ọ dịghị shiee n'oge a na-akpụzi usoro, ihe ikwu molekụla arọ na-ebelata, àgwà nke ngwaahịa dị mma, na ọ bụghị nanị na ikwu molekul arọ, na ọ nwere ike hazie nnukwu diameters na a. kacha dayameta nke 500mm na a mgbidi ọkpụrụkpụ nke naanị 3mm.Ọkụ.Otú ọ dị, n'ihi obere kọntaktị dị n'etiti akụrụngwa na akụkụ ọkụ n'oge usoro izipu, ọkụ ọkụ dị ala, nke na-egbochi ngwa ngwa nke extrusion ya.
Oge nzipu: Jun-14-2020