Hoʻomaka i ka PBT

ʻO ka polybutylene terephthalate (PBT no ka pōkole) he pūʻulu polyesters, i hana ʻia me 1.4-pbt butylene glycol a me terephthalic acid (PTA) a i ʻole terephthalic acid ester (DMT) e ka polycondensation, a ua hana ʻia me ka waiū keʻokeʻo ma o ke kaʻina hui.Translucent i opaque, crystalline thermoplastic polyester resin.Me ka PET, ua kapa ʻia ʻo ia ka polyester thermoplastic, a i ʻole polyester saturated.

Ua hoʻokumu mua ʻia ʻo PBT e ka ʻepekema Kelemania ʻo P. Schlack i ka makahiki 1942, a laila hoʻomohala ʻia e Celanese Corporation (ʻo Ticona i kēia manawa) a kūʻai ʻia ma lalo o ka inoa kālepa Celanex, i hoʻokumu ʻia i ka makahiki 1970 ma ke ʻano he 30% glass fiber reinforced plastic ma lalo o ka inoa kālepa X- 917, ua hoʻololi ʻia i CELANEX.Ua hoʻokuʻu ʻo Eastman i kahi huahana me ka hoʻoikaika ʻole ʻana i ka fiber aniani, ma lalo o ka inoa kālepa Tenite (PTMT);i ka makahiki hoʻokahi, ua hoʻomohala ʻo GE i kahi huahana like me ʻekolu mau ʻano o ka hoʻoikaika ʻole, hoʻoikaika a hoʻopau iā ia iho.Ma hope mai, ua komo nā mea hana kaulana o ka honua e like me BASF, Bayer, GE, Ticona, Toray, Mitsubishi Chemical, Taiwan Shin Kong Hefei, Changchun Synthetic Resins, a me Nanya Plastics i nā pae hana, a ʻoi aku ma mua o 30 mau mea hana ma ka honua holoʻokoʻa.

E like me ka PBT i ka wela, ke kū'ē i ka wā, ke kū'ē kemika, nā hiʻohiʻona uila maikaʻi, ka haʻahaʻa wai haʻahaʻa, ka nani maikaʻi, hoʻohana nui ʻia i nā mea uila, nā ʻāpana kaʻa, nā mīkini, nā huahana hale, a me nā huahana PBT a me PPE, PC, POM, ʻO PA, a me nā mea ʻē aʻe i ʻike ʻia ʻo ka ʻelima nui o ka ʻenekinia plastik.ʻO ka wikiwiki o ka crystallization PBT, ʻo ke ʻano kaʻina hana kūpono loa ʻo ka injection molding, nā ʻano hana ʻē aʻe he extrusion, blow molding, coating, etc.

Laulā noi maʻamau

ʻO nā mea hana o ka hale (nā lau hoʻoponopono meaʻai, nā mea hoʻomaʻemaʻe hoʻomaʻemaʻe, nā pā uila, nā ʻili hoʻomaloʻo lauoho, nā kīʻaha kope, a me nā mea ʻē aʻe), nā mea uila (nā hoʻololi, nā hale kaʻa, nā pahu fuse, nā kī kī kamepiula, a me nā mea ʻē aʻe). , Radiator Grille windows, panel kino, uhi huila, puka a me ka puka makani, etc.).

Nā waiwai kemika a me ke kino

ʻO ka PBT kekahi o nā thermoplastics ʻenehana ikaika loa, he mea semi-crystalline me ka paʻa kemika maikaʻi loa, ka ikaika mechanical, nā waiwai insulation uila a me ke kūpaʻa wela.He kūpaʻa maikaʻi ka pbt ma lalo o nā kūlana kaiapuni.pbt nawaliwali loa i ka mako.ʻO ka ikaika tensile o ka PBT ʻole i hoʻoikaika ʻia ʻo 50 MPa, a ʻo ka ikaika tensile o ke aniani fiber additive type PBT he 170 MPa.ʻoi aku ka nui o ke aniani fiber additive e lilo i mea palupalu.ʻO ka crystallization o PBT wikiwiki loa, a ʻo ka hoʻoheheʻe ʻole ʻana e hoʻohuli i ka deformation.No ka mea me ke aniani fiber additive type, hiki ke hoemiia ka shrinkage rate ma ke kaʻina hana, a me ka shrinkage rate ma ka vertical direction he mea like ole ia me ka mea maʻamau.ʻO ka emi ʻana o nā mea PBT maʻamau ma waena o 1.5% a me 2.8%.ʻO ka emi ʻana o nā mea i loaʻa i ka 30% aniani fiber additives ma waena o 0.3% a me 1.6%.

Nā hiʻohiʻona o ke kaʻina hana hoʻoheheʻe PBT

ʻO ke kaʻina hana polymerization o PBT he makua, haʻahaʻa ke kumu kūʻai a maʻalahi hoʻi e hoʻoheheʻe a hana.ʻAʻole maikaʻi ka hana o ka PBT i hoʻololi ʻole ʻia, a pono e hoʻololi ʻia ka noi maoli o ka PBT, ʻo ia hoʻi, ʻoi aku ka nui o nā māka i hoʻololi ʻia i ke aniani fiber ma mua o 70% o PBT.

1, PBT he wahi hehee maopopo, hehee wahi o 225 ~ 235 ℃, he crystalline mea, crystallinity a hiki i 40%.ʻAʻole pili ka viscosity o ka hehee PBT e ka wela e like me ke koʻikoʻi shear, no laila, i ka hoʻoheheʻe ʻana, ʻike ʻia ke kaomi injection ma ka PBT melt fluidity.PBT ma ke ano hoohehee o ka wai maikai, ha'aha'a viscosity, lua wale no i ka nylon, ma ka ho'ohehe'e 'ana ma'alahi ke hana 'ia "PBT molded products are anisotropic, and PBT is easy to degrade under high temperature in contact with water.

2、Mekini hoʻoheheʻe injection

Ke koho ʻana i kahi mīkini hoʻoheheʻe injection type screw.Pono e noʻonoʻo ʻia kēia mau mea.

① Pono e mālama ʻia ka nui o nā mea i hoʻohana ʻia i ka huahana ma 30% a i 80% o ka nui o ka nui o ka nui o ka hoʻoheheʻe ʻia o ka mīkini hoʻoheheʻe ʻia.ʻAʻole kūpono ka hoʻohana ʻana i ka mīkini hoʻoheheʻe injection nui e hana i nā huahana liʻiliʻi.

② Pono e koho ʻia me ka wili wili ʻekolu, ka lōʻihi a me ke anawaena lākiō o 15-20, ka lākiō kaomi o 2.5 a 3.0.

③ ʻOi aku ka maikaʻi o ka hoʻohana ʻana i ka nozzle paʻa ponoʻī me ka mea hoʻomehana wela a me ka mana wela.

④Ma ka hoʻoheheʻe ʻana i ka lapalapa ahi PBT, pono e mālama ʻia nā ʻāpana kūpono o ka mīkini hoʻoheheʻe ʻia me ka anti-corrosion.

3 、 Huahana a me ka hoʻolālā mold

①ʻAʻole mānoanoa ka mānoanoa o nā huahana, a pili ka PBT i ka notch, no laila e hoʻopili ʻia nā wahi hoʻololi e like me ke kihi ʻākau o nā huahana e nā arcs.

② ʻO ka hoʻoheheʻe ʻana o ka PBT i hoʻololi ʻole ʻia he nui, a ʻo ka ʻōpala e loaʻa i kahi pali o demoulding.

③ Pono e hoʻolako ʻia ka mold me nā puka hoʻopau a i ʻole nā ​​​​puka hoʻopau.

④Pono ke anawaena o ka puka.Manaʻo ʻia e hoʻohana i nā kukini pōʻai e hoʻonui i ka hoʻololi kaomi.Hiki ke hoʻohana ʻia nā ʻano ʻīpuka like ʻole a hiki ke hoʻohana ʻia nā kukini wela.Pono ke anawaena o ka puka ma waena o 0.8 a me 1.0*t, kahi t ka mānoanoa o ka ʻāpana plastik.I ka hihia o nā puka i loko o ka wai, ua ʻōlelo ʻia ke anawaena haʻahaʻa o 0.75mm.

⑤ Pono e hoʻolako ʻia ka ʻōpala me ka mea mālama wela.ʻAʻole pono ka mahana kiʻekiʻe o ka mold ma mua o 100 ℃.

⑥No ka hoʻoheheʻe ʻia ʻana o ka PBT me ka lapalapa ahi, pono e uhi ʻia ka ili o ka ʻōpala e pale i ka pala.

Hoʻonohonoho ʻana i nā ʻāpana kaʻina

Ka hoʻomaloʻo ʻana: PBT mea maʻalahi i ka hydrolyzed i ke kiʻekiʻe wela, no laila pono e hoʻomaloʻo ʻia ma mua o ka hana ʻana.Manaʻo ʻia e maloʻo i ka ea wela ma 120 ℃ no 4 mau hola, a ʻo ka haʻahaʻa haʻahaʻa ma lalo o 0.03%.

Ka wela hehee: 225 ℃ ~ 275 ℃, ka mahana i manaʻo ʻia: 250 ℃.

ʻO ka mahana wela: 40 ℃ ~ 60 ℃ no nā mea i hoʻoikaika ʻole ʻia.Pono ka hoʻoluʻu ʻana e hoʻohaʻahaʻa i ka deformation kulou o nā ʻāpana plastik, a ʻo ke anawaena i manaʻo ʻia o ke kahawai hoʻoheheʻe ʻana he 12mm.

ʻO ke kaomi injection: waena (maʻamau 50 a 100MPa, kiʻekiʻe i 150MPa).

ʻO ka wikiwiki hoʻoheheʻe: ʻO ka wikiwiki hoʻoluʻu PBT ka wikiwiki, no laila pono e hoʻohana ʻia ka wikiwiki o ka injection.Pono e hoʻohana ʻia ka wikiwiki o ka injection (no ka mea, paʻa koke ka PBT).

ʻO ka wikiwiki o ka wili a me ke kaomi hope: ʻAʻole pono ka wikiwiki o ka wili no ka hoʻoheheʻe ʻana i ka PBT ma mua o 80r/min, a ma waena o 25 a me 60r/min.ʻO ke kaomi hope he 10% -15% o ke kaomi injection.

Nānā

①Ka hoʻohana ʻana i nā mea hana hou ʻO ka ratio o nā mea hana hou i nā mea hou he 25% a 75%.

②ʻO ka hoʻohana ʻana i ka mea hoʻokuʻu mold ma ka maʻamau, ʻaʻohe mea hoʻokuʻu mold i hoʻohana ʻia, a hiki ke hoʻohana ʻia ka mea hoʻokuʻu mold silicone inā pono.

③Ka hana pani ʻana ʻO ka manawa pani o PBT aia i loko o 30min, a hiki ke hoʻohaʻahaʻa i ka mahana i 200 ℃ ke pani ʻia.I ka hana hou ʻana ma hope o ka pani ʻana i ka wā lōʻihi, pono e hoʻokaʻawale ʻia nā mea i loko o ka pahu a laila e hoʻohui ʻia nā mea hou no ka hana maʻamau.

④ Ma hope o ka hana ʻana o nā huahana ʻO ka maʻamau, ʻaʻohe pono e mālama ʻia, a inā pono, 1 ~ 2h mālama ʻia ma 120 ℃.

PBT wili kūikawā

No ka PBT, he mea maʻalahi ke hoʻoheheʻe ʻia, ʻoluʻolu i ke kaomi a pono e hoʻohui i ka fiber aniani, ʻo ka PBT special screw e hana i ka paʻa paʻa a hoʻohana i nā mea ʻelua e hoʻomaikaʻi ai i ka pale ʻana i nā mea me ka fiber aniani (PBT+GF).