Mamiriro ekutsvagisa uye kushandiswa kwePBT engineering plastiki modification

PBT Imhando yepolyester yakakora yakagadzirwa ne terephthalic acid (PTA) kana dimethyl terephthalate (DMT) uye 1,4-butanediol (BDO) ne polycondensation reaction, ine hunhu hwakanaka hwemakanika, chimiro chayo che symmetric molecular chinogona kuita close stacking, ine crystallinity yakakwira, inogona kukurumidza kugadzirwa crystallized patembiricha yakaderera. Iine hunhu hwakanaka hwemakanika, chimiro chayo che symmetric molecular kuti chisvike close stacking, ine crystallinity yakakwira, patembiricha yakaderera inogona kukurumidza kugadzirwa crystallized. Kugadziriswa kwezvikamu zvePBT kuri nyore kuyerera molding uye molding cycle nguva ipfupi, inogona kuderedza mari yekugadzira, uye PBT ine hunyoro hunodzivirira, hunodzivirira abrasion, hunodzivirira mafuta nezvimwe zvakanakira, creep idikiwo.

Sezvo PBT iine zvikamu zvekristaro nezvisiri zvekristaro, zviri nyore kuigadzirisa nekuwedzera zvimwe zvinhu. Zvisinei, PBT iripowo nyore kuipisa, uye kusangana nerefrigerant nemamorekuru madiki kunonaya, hunhu hwe dielectric hwezvikamu zvisina kukwana zvemadziro matete zvinokasira kukotama uye zvimwe zvikanganiso, zvichideredza kugona kwayo kushandiswa. Kuti igadzirise kushaya kushanda kwePBT resin yakachena, PBT resin yave iri ongororo yekuchinja.

1. Muchina wekugadzira mapurasitiki ePBT engineering Mamiriro aripo pari zvino ekutsvaga shanduko

Mumakore achangopfuura, mabhizinesi akakodzera akagadzira mashandisirwo akasiyana-siyana ematekinoroji matsva nezvigadzirwa zvitsva, mapurasitiki ekugadzira ePBT kuti ave nekushanda kwepamusoro, kushanda, uye kwakasiyana-siyana. Kune zvinodiwa zveindasitiri, kuburikidza nekushandurwa kuti kuwedzere kushanda kwePBT, kunofarirwa nemusika. Parizvino, kugadziriswa kwecopolymerization, kugadziriswa kwezvinhu zvisingasanganisike, tekinoroji ye nanocomposite, kugadziriswa kwekubatanidza nedzimwe nzira zvinonyanya kushandiswa kumba nekune dzimwe nyika kuvandudza kushanda kwakakwana kwePBT. Tsvagiridzo yekushandurwa kwezvinhu zvePBT inonyanya kutarisa pakusimba kwakanyanya, kunonoka kwemoto kwakanyanya, warpage yakaderera, mvura shoma, dielectric shoma nezvimwewo.

yokungoitawo ehupfumi

Simba rekudhonza resin rePBT rakachena, simba rekudhonza resimbi uye modulus yekudhonza resimbi zvakaderera, mumaindasitiri hazvigone kushandiswa zvakanyanya, zvinoda kugadziriswa kuti zvivandudze hunhu hwemakanika. Fiber yegirazi ine zvakanakira zvekushandisa zvakasimba, nzira iri nyore yekuzadza uye mutengo wakaderera, nezvimwewo. Kuwedzerwa kwefiber yegirazi kuPBT kunoita kuti zvakanakira zvepakutanga zvePBT resin zviitwe, uye simba rekudhonza resimbi, simba rekudhonza resimbi uye simba rekupinza rezvigadzirwa zvePBT zvakagadziridzwa zvakanyanya.

Kuwedzera kune fiber yegirazi, mamwe mafiber anogona kuiswa kuti avandudze hunhu hwePBT. Zeng Deming nevamwe vake vakashandisa basalt pfupi kuti vawedzere resin yePBT, mushure mekunge basa rebasalt rekubatanidza rinogona kuenderana zviri nani nePBT, zvichinyatso wedzera hunhu hwePBT composites.

Flame retardant properties

Muchina wePBT wakachena unopinza mwenje unongosvika padanho reHB chete, uri nyore kupisa uye unopfuta uchidonha nguva nenguva, murazvo uri nyore kuparadzira, kushandiswa kwawo mumotokari, midziyo yemagetsi nemachira nezvimwe zvinhu zvakaganhurirwa. Zvidziviriri zvemoto zvine halogenated uye zvidziviriri zvemoto zvisina halogenated zvinowanzowedzerwa kuPBT kuti zvigadziriswe. Zvidziviriri zvemoto zvine halogenated zvinoburitsa utsi hune chepfu hune hydrogen halide kana huchipiswa, izvo zvinokuvadza hutano hwevanhu nenzvimbo, uye zvimwe zvinodziviriri zvemoto zvine halogenated zvakarambidzwa muEuropean Union. Kugadziriswa kwePBT kunonyanya kushandisa phosphorus uye inorganic flame retardants.

Kana uchishandisa shanduko ye inorganic flame retardant, kuwedzera huwandu hwakawandisa kunotungamira kudzikira kwehunhu hwema mechanical hwechinhu ichi; asi phosphorus flame retardant haina dambudziko iri, uye ine utsi hushoma, chepfu shoma, uye ine hunhu hwakawanda hwe flame retardant. Phosphorus flame retardant inowanzo sanganiswa ne nitrogen-containers kuti iwane system inoshanda zvakanyanya ye flame retardant. Phosphorus flame retardant mukupisa kugadzira phosphoric anhydride kuti iite carbonization yemvura inobvira, carbon layer inogona kuderedza kupisa, kunonoka kana kudzivirira kugadzirwa kwemagasi anobvira, uye phosphoric anhydride mushure mekupisa kugadzira chinhu chakanyungudutswa chinofukidza pamusoro pechinhu chinobvira, zvichitadzisa kuburitswa kwemagasi anobvira.

Kugadziriswa kweWarp

PBT zvinhu zviri nyore, zviri nyore kurongeka, crystallization, zvichikonzera kupwanyika kukuru kwezvinhu, zvichikonzera zvikamu zvePBT, kunyanya zvikamu zvikuru zvakatetepa zvekuchinja kwewarping. Kune girazi fiber yakasimbiswa PBT, nekuda kwekuwedzera magirazi fibers ne anisotropy, zvichikonzera nzira dzakasiyana mukuumbwa kwejekiseni rechinhu, chiyero chekupwanyika kwechinhu chakasiyana, zvichiwedzera kupwanyika kwewarping kwezvikamu, kwete kungokanganisa kunaka kwepamusoro pezvigadzirwa zvepurasitiki uye mashandiro ekuisa, asiwo kukanganisa simba repurasitiki.

Kuti zvikamu zvePBT zvikwanise kuchinjika, pamusoro pekuvandudza chimiro chezvikamu, dhizaini yemould uye maitiro ekuumba, zvinogonawo kugadziriswa kuti zvideredze kuchinjika kwePBT. Mumakore achangopfuura, kuchinjika kwePBT kwezvinhu zvePBT kwakanyanya kuvandudzwa nekuzadza zvinhu zvisina organic uye kubatanidza goridhe. Kuzadza zvinhu zvisina organic kunosanganisira kuzadza zvinhu zvisina organic kamwe chete uye kuzadza kwakabatana negirazi fiber, uye zvinhu zvisina organic zvinoshandiswa kuzadza zvinonyanya kusanganisira talc, mica, wollastonite, magirazi beads, kaolin, calcium sulfate whiskers nezvimwewo.

Kushanda kwemvura inonaya

Sezvo zvinhu zvakagadzirwa nePBT zvisingagone kubatwa zvizere panguva yekugadzira, mamorekuru madiki, maoligomers, nezvimwewo zvinogadzirwa, uye zvigadzirwa zvakagadzirwa nezvinhu zvePBT zvisina kuchinjwa zvinoburitsa mvura pasi pemamwe mamiriro, izvo zvinokanganisa kushanda kwezvikamu. Kana zvinhu zvePBT zvichishandiswa musilencer mukati mefriji compressor, motor coil skeleton uye air conditioner insulation skeleton, nezvimwewo, nekuda kwemamiriro ekushanda akakosha, mvura yakawanda yemamorekuru madiki mufiriji (Freon, dichlorodifluoridichloromethane) yakanyungudutswa mufiriji tube zviri nyore kuvharira firiji tube, zvekuti firiji yayo inokundikana.

PBT inonyanya kukonzera zwitterion diki ye resin pachayo pamwe nehuwandu hushoma hwezvinowedzera zviri mukati. Kushandiswa kwegirazi fiber uye resin ine viscosity yakakura, yakazadzwa nehuwandu hwakati hwe adsorbent kunogona kuderedza huwandu hwePBT precipitation. Parizvino, inorganic porous material adsorption inoumbwa uye kuwedzerwa kwe blocking agent, chain extender, 1,4 cyclohexanedimethanol (CHDM) nedzimwe nzira dzemakemikari dzekugadzirisa PBT precipitation.

Dielectric properties

Zvinhu zvePBT mumasekete akabatanidzwa uye electromagnetic shielding nedzimwe nzvimbo dzekushandisa, hunhu hwe dielectric hwekumhanya kwekutumira chiratidzo, kurasikirwa kwechiratidzo nezvimwewo zvinoita basa rakakosha. Mumakore achangopfuura, hunhu hwe dielectric hwezvinhu zvinodzivirira kupisa hunoisa zvinodiwa zvakanyanya, zvinodiwa zve dielectric constant yezvinhu zvinodzivirira kupisa hazvipfuure 2.8. nepo hunhu hwe dielectric hwezvinhu zvakachena zvePBT husingakwanise kusangana nezvinodiwa zvekutaurirana, kukura kwe dielectric constant yakaderera, kurasikirwa kwe dielectric yakaderera kwezvinhu zvePBT kwakakosha zvikuru.

Parizvino, hunhu hwe dielectric hwePBT hunonyanya kuchinjwa nekuzadza nekubatanidza ma copolymers e dielectric akaderera, uye ma filler anoshandiswa zvakanyanya i polytetrafluoroethylene powder uye hollow glass beads. Carbon nanotubes inewo mhedzisiro yakanaka pahunhu hwe dielectric hwezvinhu zvePBT, asi kuwedzerwa kwehuwandu hwakawanda hwe dielectric constant yechinhu uye kurasikirwa kwe dielectric kunowedzera.

Nekukurumidza kukura kwemotokari dzemagetsi, simba re dielectric rinokwira zvakanyanya, kunyange zvazvo PBT arc resistance yakanaka, iri nyore kuigadzira nekumhanya asi simba re dielectric shoma, haigone kuwanikwa mumotokari dzemagetsi kuti dziite kuti dziite kuti dziite. Kuburikidza nekirasi yemutyairi kana ceramic filler paPBT dielectric properties, shanduko yacho inovandudza simba re dielectric rezvinhu kuti ive nechokwadi chekuti motokari dzemagetsi dzakachengeteka.