Okwu mmalite nke PBT

Polybutylene terephthalate (PBT maka mkpụmkpụ) bụ usoro nke polyesters, nke a na-eme 1.4-pbt butylene glycol na terephthalic acid (PTA) ma ọ bụ terephthalic acid ester (DMT) site na polycondensation, ma na-acha ọcha ọcha site na usoro ngwakọta.Translucent ruo opaque, crystalline thermoplastic polyester resin.Ya na PET, a na-akpọkọta ya dị ka polyester thermoplastic, ma ọ bụ polyester jupụtara.

Onye ọkà mmụta sayensị German P. Schlack bụ nke mbụ mepụtara PBT na 1942, wee mepụta ụlọ ọrụ mmepụta ihe site na Celanese Corporation (nke bụ Ticona ugbu a) ma na-ere ahịa n'okpuru aha ahia Celanex, nke ewepụtara na 1970 dị ka eriri iko 30% kwadoro plastic n'okpuru aha ahia X- 917, mechara gbanwee gaa CELANEX.Eastman weputara ngwaahịa na-enweghị nkwado eriri iko, n'okpuru aha ahia Tenite (PTMT);N'otu afọ ahụ, GE mekwara ụdị ngwaahịa a nke nwere ụdị atọ dị iche iche na-akwadoghị, gbasie ike ma na-ekpochapụ onwe ya.Mgbe nke ahụ gasịrị, ndị na-emepụta ụwa ama ama dịka BASF, Bayer, GE, Ticona, Toray, Mitsubishi Chemical, Taiwan Shin Kong Hefei, Changchun Synthetic Resins, na Nanya Plastics abanyela n'usoro mmepụta ihe, na e nwere ihe karịrị 30 na-emepụta n'ụwa nile.

Dị ka PBT nwere okpomọkụ na-eguzogide, ihu igwe na-eguzogide, chemical iguzogide, ezi eletriki e ji mara, ala mmiri absorption, ezi gloss, ọtụtụ ebe na-eji ngwá electronic, akpakanamde akụkụ, ígwè, ụlọ ngwaahịa, wdg, na PBT ngwaahịa na PPE, PC, POM. PA, etc. ọnụ mara dị ka ise isi n'ozuzu engineering plastics.PBT crystallization ọsọ, usoro nhazi kachasị dabara adaba bụ ịkpụzi injection, ụzọ ndị ọzọ bụ extrusion, ịkpụ ịkpụzi, mkpuchi, wdg.

Ogo ngwa a na-ahụkarị

Ngwa ụlọ (ụba nhazi nri, ihe ndị na-ehicha ihe, ndị na-efe ọkụ eletrik, shells dryer shells, arịa kọfị, wdg), ihe eletriki (mgbanwe, ụlọ moto, igbe fuse, igodo keyboard kọmputa, wdg), ụlọ ọrụ ụgbọ ala (mkpụrụ ọkụ oriọna. , windo radiator grille, ogwe anụ ahụ, mkpuchi wiil, ọnụ ụzọ na ihe ndị dị na windo, wdg).

Chemical na anụ ahụ Njirimara

PBT bụ otu n'ime thermoplastics injinia siri ike, ọ bụ ihe ọkara kristal nwere ezigbo nkwụsi ike kemịkalụ, ike igwe, ihe mkpuchi ọkụ na nkwụsi ike ọkụ.pbt nwere ezigbo nkwụsi ike n'okpuru ọnọdụ gburugburu ebe obibi.pbt nwere mmetụta absorption nke mmiri adịghị ike.Ike nkwụsi ike nke PBT na-enweghị ike imeziwanye bụ 50 MPa, na ike ike nke iko eriri mgbakwunye ụdị PBT bụ 170 MPa.ihe mgbakwunye eriri iko buru ibu ga-eme ka ihe ahụ kụrie.kristal nke PBT na-adị ngwa ngwa, na oyi na-enweghị isi ga-eme ka nrụrụ na-agbagọ.N'ihi na ihe na iko eriri mgbakwunye ụdị, shrinkage ọnụego na usoro ntụziaka nwere ike ibelata, na shrinkage ọnụego na vetikal direction bụ isi adịghị iche na nkịtị ihe.Ọnụego mbelata nke ihe PBT n'ozuzu dị n'etiti 1.5% na 2.8%.Mbelata nke ihe nwere 30% ihe mgbakwunye eriri iko dị n'etiti 0.3% na 1.6%.

Njirimara nke usoro ịkpụzi injection PBT

Usoro polymerization nke PBT tozuru oke, ọnụ ala dị ala ma dị mfe ịkpụzi na nhazi.Arụmọrụ nke PBT na-agbanweghị agbanwe adịghị mma, yana ngwa ngwa nke PBT kwesịrị imezigharị, nke, fiber glass fiber na-eme ka akara ule gbanwere karịa 70% nke PBT.

1, PBT nwere ebe mgbaze doro anya, ebe mgbaze nke 225 ~ 235 ℃, bụ ihe kristal, crystallinity ruo 40%.viscosity nke PBT gbazee adịghị emetụta okpomọkụ dị ka nrụgide siri ike, ya mere, na ịkpụzi injection, nrụgide injection na PBT melt fluidity doro anya.PBT na ọnọdụ a wụrụ awụ nke ezigbo mmiri, obere viscosity, nke abụọ na naịlọn, na ịkpụzi dị mfe ime “PBT kpụrụ ngwaahịa bụ anisotropic, na PBT dị mfe iweda n'okpuru elu okpomọkụ na kọntaktị na mmiri.

2, Injection ịkpụzi igwe

Mgbe ị na-ahọrọ ihe ịghasa ụdị injection ịkpụzi igwe.Ekwesịrị ịtụle isi ihe ndị a.

① A ga-achịkwa ọnụọgụ ihe eji eme ihe na ngwaahịa na 30% ruo 80% nke ogo kachasị elu nke igwe na-akpụzi injection.Ọ bụghị ihe kwesịrị ekwesị iji nnukwu igwe na-akpụzi injection na-emepụta obere ngwaahịa.

A ga-ahọrọ ② na nkedo nke nta nke nta nke nta nke nta atọ, ogologo na dayameta ruru 15-20, mkpakọ ruru 2.5 ruo 3.0.

③Ọ kacha mma iji nozzles na-ekpochi onwe ya na ngwaọrụ kpo oku yana njikwa okpomọkụ.

④ N'ịkpụzi ọkụ retardant PBT, akụkụ ndị dị mkpa nke igwe na-akpụzi injection kwesịrị ka ejiri mgbochi corrosion gwọọ ya.

3, Ngwaahịa na ebu imewe

① Ọkpụrụkpụ nke ngwaahịa ekwesịghị ịdị oke oke, na PBT na-enwe mmetụta na ọkwa ahụ, ya mere ebe mgbanwe dị ka akụkụ ziri ezi nke ngwaahịa kwesịrị ijikọ arcs.

②Mkpụrụ akpụ nke PBT na-agbanweghị agbanwe buru ibu, na ebu kwesịrị inwe mkpọda mkpọda.

③Akpụkpọ ahụ kwesịrị ịkwado ya na oghere iyuzucha ma ọ bụ oghere iyuzucha.

④ Dayameta nke ọnụ ụzọ ámá kwesịrị ibu ibu.A na-atụ aro ka iji ndị na-agba ọsọ okirikiri mee ka nrụgide nrụgide dịkwuo elu.Enwere ike iji ụdị ọnụ ụzọ dị iche iche na ndị na-agba ọsọ na-ekpo ọkụ nwekwara ike iji.Dayameta ọnụ ụzọ ámá kwesịrị ịdị n'etiti 0.8 na 1.0 * t, ebe t bụ ọkpụrụkpụ nke akụkụ plastik.N'ihe banyere ọnụ ụzọ ámá mmiri mmiri, a na-atụ aro dayameta kacha nta nke 0.75mm.

⑤ Ekwesịrị iji ngwaọrụ njikwa okpomọkụ kwado ihe ebu.Oke okpomọkụ nke ebu ekwesịghị gafere 100 ℃.

⑥ N'ihi na ọkụ retardant ọkwa PBT ịkpụzi, elu nke ebu kwesịrị chrome plated iji gbochie corrosion.

Ntọala nke usoro parameters

Ọgwụgwọ ihicha: PBT na-adị mfe hydrolyzed na elu okpomọkụ, n'ihi ya, ọ dị mkpa ka akpọnwụwo tupu nhazi.A na-atụ aro ka akpọọ nkụ n'ikuku na-ekpo ọkụ na 120 ℃ maka awa 4, na iru mmiri kwesịrị ịbụ ihe na-erughị 0.03%.

Na-agbaze okpomọkụ: 225 ℃～275 ℃, akwadoro okpomọkụ: 250℃.

Igwe okpomọkụ: 40 ℃ ~ 60 ℃ maka ihe na-akwadoghị.Igwe jụrụ oyi kwesịrị ịdị n'otu iji belata nrụrụ agba nke akụkụ rọba ahụ, yana dayameta akwadoro nke ọwa mmiri jụrụ oyi bụ 12mm.

Nrụgide injection: ọkara (n'ozuzu 50 ruo 100MPa, kacha ruo 150MPa).

Ọsọ ịgba ntụtụ: Ọsọ ịgba ọgwụ mgbochi PBT na-agba ọsọ ngwa ngwa, yabụ ekwesịrị iji ọnụego ịgba ọgwụ ngwa ngwa.Ekwesịrị iji ọnụego ntụtụ kacha ngwa ngwa (n'ihi na PBT na-agbake ngwa ngwa).

Ọsọ ọsọ na nrụgide azụ: Ọsọ skru maka ịkpụzi PBT ekwesịghị gafere 80r/min, yana n'ozuzu n'etiti 25 na 60r/min.Nrụgide azụ n'ozuzu bụ 10%-15% nke nrụgide injection.

Nlebara anya

① Ojiji nke ihe eji emeghari ihe ruru ihe eji emeghari na ihe ohuru bu 25% rue 75%.

②Ojiji nke ihe ntọhapụ ebu N'ozuzu, a naghị eji ihe ntọhapụ ebu, yana onye na-ahapụ silicone nwere ike iji ya ma ọ bụrụ na ọ dị mkpa.

③ Nhazi oge nkwụsị nke PBT dị n'ime nkeji 30, enwere ike iweda ọnọdụ okpomọkụ ruo 200 ℃ mgbe emechibidoro.Mgbe ị na-emepụta ọzọ mgbe nkwụsị ogologo oge gasịrị, a ga-ekpochapụ ihe dị na gbọmgbọm ahụ ma tinyezie ihe ọhụrụ maka mmepụta nkịtị.

④ Post-processing nke ngwaahịa N'ozuzu, ọ dịghị ọgwụgwọ a chọrọ, na ọ bụrụ na ọ dị mkpa, 1 ~ 2h ọgwụgwọ na 120 ℃.

PBT pụrụ iche ịghasa

Maka PBT, nke dị mfe ire ere, na-enwe mmetụta maka nrụgide na mkpa ịgbakwunye eriri iko, ihe nkedo PBT pụrụ iche na-emepụta nrụgide kwụsiri ike ma na-eji okpukpu abụọ mee ihe iji melite nkwụsị nke ihe onwunwe nwere eriri iko (PBT + GF).