Polypropylene ipolymer inoshandiswa zvakanyanya mukushandiswa kwakasiyana-siyana nekuda kwemusanganiswa wayo wakanaka wehunhu hwayo. Hunhu hwayo, hwakadai sehwemuviri, hwemakanika uye hwemaziso hunogona kuwedzerwa nekushandisa manucleating agents nema clearing agents zvakakodzera. Izvi zvinowedzera zvinobatsira mukuita kuti PP iite crystallization panguva yekugadzirisa, nokudaro zvichiwedzera hunhu hwayo hwatowanikwa.

Nzwisisa mashandisirwo ema nucleating agents nema clarifying agents pamwe nekuwana mazano ekusarudza kuti uwedzere kugadzirwa, kugadzirisa chimiro uye morphology, uye kuderedza hutsi mu polypropylene formulations yako.

I. Basa reNucleating Clarifying Agents muPP

Kusimba kwema polymers e semi-crystalline ndiko kunoita kuti pave nezvinhu zvakawanda zvakaita sekugadzikana, kujeka, uye kuomarara.

Kune chikamu chakatsanangurwa uye maitiro, kristallinity inodzorwa nechimiro chepolymer, chimiro, uye mamiriro ekugadzirisa izvo zvinoguma nekuenzana kwakanangana kwekuunganidza kupisa nekutonhodza. Nekuda kweizvozvo, crystallinity inowanzosiyana, nhoroondo yekupisa yakasiyana paganda nepakati pezvikamu kana zvinhu.

Zvinhu zvinoshandisa nucleating agents uye zvinojekesa zvinhu zvinokurumidzisa nekugadzirisa crystallization zvichibvumira kugadzirisa hunhu hwema semi-crystalline polymers kuti huenderane nezvinodiwa zvekushanda.

·Muma polypropylene formulations, kuwedzera nucleating agents (zvinonziwo nucleators) kunoita kuti pave nekuvandudzwa kwekushanda uye hunhu hwekugadzirisa, zvakaita se:

· Kujeka kwakavandudzwa uye mhute yakaderera

· Simba rakavandudzwa uye kuomarara

· Kudzikira kwekupisa (HDT)

· Nguva yekutenderera yakaderera

· Kudzikira kwewarpage uye kuderera kwakafanana

· Kuderera kwekunzwa kwepigment maererano nekuchinja kwechimiro nemavara akasiyana

·Kugona kugadziriswa kwakawedzerwa mune mamwe maapplication

Saka, nucleation inzira ine simba yekuvandudza hunhu hwepolypropylene hwepanyama, hwemakanika, uye hwemaziso. Kujeka, kugadzikana kwezvikamu, warpage, shrinkage, CLTE, HDT, hunhu hwemakanika uye mhedzisiro yekudzivirira zvinogona kuvandudzwa nekusarudza manucleator kana maclarifier nekungwarira.

II. Polypropylene uye Kupenya Kwayo

Polypropylene ipolymer inoshandiswa zvakanyanya, yakagadzirwa kubva mupolymerization yepropene monomer. Kana polymerization yaitwa, PP inogona kuumba zvivakwa zvitatu zveketani (atactic, isotactic, syndiotactic) zvichienderana nenzvimbo yemapoka emethyl. Kupenya kwepolymer kunoratidzwa ne:

· Maumbirwo nehukuru hwemakristaro

·Zviyero zvekristaro, uye pakupedzisira

·Kurongeka kwemakristaro

Isotactic polypropylene (iPP) ipolymer yakaita semi-crystalline. Inoratidzwa nechiyero chakanaka chemutengo nekushanda, zvichiita kuti ive inoyevedza zvikuru mumhando dzakasiyana siyana dzakadai semotokari, midziyo yemagetsi, mapaipi, kurongedza, nezvimwewo.

Isotacticity index ye iPP yakabatana zvakananga nehuwandu hwecrystallinity iyo ine simba guru pakushanda kwepolymer. Isotacticity inowedzera crystallization kinetics, flexural modulus, kuomarara & kujeka, uye inoderedza impact resistance & permeability.

Tafura iri pazasi inoenzanisa hunhu hwema polypropylene homopolymers maviri ane indekisi ye isotacticity yakasiyana.

III. Kugadziriswa kwePolypropylene nekristaro
Zvichienderana nemamiriro ezvinhu, Isotactic Polypropylene inogona kuita zvikamu zvina zvakasiyana zvinoratidza α, β, γ uye mesomorphic smectic. Zvikamu zveα neβ ndizvo zvinonyanya kukosha.

α Chikamu

1. Chikamu ichi chakasimba uye chinozivikanwa zvikuru.

2. Makristaro aya ndeemonoclinic crystal system.

Chikamu cheβ

1. Chikamu ichi chinochinjika, uye makristaro acho ndeemugadziriro yemakristaro enhema ane makirosita matanhatu.

2. Chikamu cheβ chinowanikwa zvakanyanya mu block copolymerized polypropylene uye chinogona kugadzirwa nekuwedzera ma nucleating agents chaiwo.

3. Chimiro ichi chekristaro chakawanikwa naPadden naKeith muna 1953; chinogona kusimudzirwa nekuita kuti kristaro ive pakati pe130°C ne132°C, kutarisisa zvakanyanya, kana kuwedzera zvimwe zvinhu zvinoumba nucleating agents.

4. Kuvapo kwechikamu cheβ muma polypropylene homopolymers kunowanzo wedzera ductility yechigadzirwa chapera, uye mhedzisiro yacho inonyanya kukosha kana huwandu hwechikamu cheβ hwasvika 65%.

Chikamu cheγ

1. Chikamu ichi chinochinjikawo, chine makristaro etriclinic.

2. Chimiro ichi chekristaro hachiwanzoitiki; chinonyanya kuoneka mupolypropylene ine huremu hushoma uye inoumbwa nekuumbwa kwekristaro pasi pekumanikidzwa kwakanyanya uye mwero wekutonhorera wakaderera.

Ⅳ. Maitiro eNucleation muPolypropylene

Zvinozivikanwa kuti panotangira kugadzirwa kwema polymers makemikari madiki (tunhu tudiki) twakabatanidzwa muzvinhu zvinonyunguduka, tsvina, guruva, nezvimwewo. Zvinokwanisika kugadzirisa nekudzora chimiro che crystalline nekuwedzera utachiona "hwekugadzira" hunounzwa mu polymer melt. Kushanda uku kunonzi Nucleation.

Zvinhu zvinoshandisa nucleators kana nucleating agents zvinopa nzvimbo dzekutanga makristaro.

Zviyeredzi (Clarifiers) iboka diki remanucleator anopa makristaro madiki anoparadzira chiedza chidiki uye, nekudaro, zvinowedzera kujeka kweukobvu hwemadziro hwakafanana hwechikamu.

Basa rezvinhu izvi zvinogadzira nucleating nderekuvandudza hunhu hwemuviri uye hwemakanika hwezvikamu zvakapedzwa.

Ⅴ. Nucleators uye Clarifiers: Panel Yakapfuma Yekuwedzera

Zvinhu Zvinoumba Nucleating

Zvinhu zvinoumba nucleating agents/nucleants zvinowanzova zvinhu zvinonyungudutsa zvakanyanya zvinoparadzirwa mupolymer melt kuburikidza ne compounding. Izvi zvinoshanda se 'point nuclei' dzakasiyana dzinoita kuti kukura kwepolymer crystal kutange.

Kuwanda kwemanuclei kunoita kuti crystallization ikurumidze (nguva pfupi yekutenderera), uye huwandu hwakakwira hwecrystallinity, izvo zvinovandudza simba, kuomarara, uye HDT yePP.

Kukura kudiki kwemakristaro (spherulites) kunoita kuti chiedza chisapararire zvakanyanya uye kujeka kwacho kuve nani.

Zvinhu zvinonyanya kushandiswa zvinoumba nucleating agents zvinosanganisira munyu nemaminerari, zvakaita setalc, sodium benzoate, phosphate esters nemimwe munyu weorganic.

Talc ne sodium benzoate zvinoonekwa sezvinhu zvisingashande zvakanaka, zvisingadhuri, uye zvinopa kuvandudzwa kuri nani musimba, kuomarara, HDT, uye nguva yekutenderera.

Manyukireti anoshanda zvakanaka uye anodhura zvakanyanya, akadai sephosphate esters uye bicycloheptane salts anopa hunhu huri nani hwemuviri uye kuwedzera kujeka.

Zvinonyungudutsa Nucleating

Zvinhu zvinonyungudutsa mvura, izvo zvinonziwo 'zvisinganyungudike', zvinowanzova nenzvimbo shoma dzekunyunguduka uye zvinonyunguduka muPP yakanyungudutswa.

Sezvo polymer melt ichitonhorera muchimiro, manyukireti aya anoumba manyukireti kutanga aumba network yakapararira zvakanaka ine nzvimbo yakakwirira kwazvo.

Sezvo tembiricha ichiramba ichiderera, mafibrils ane network iyi anoshanda se nuclei kuti atange polymer crystallization.

Kuwanda kwakanyanya kwemanuclei kunotungamira kuma PP crystal aggregates madiki kwazvo, ayo anopa mwero wakaderera wekupararira kwechiedza uye kujeka kwakanyanya.

Zvese zvinojekesa zvinhu zvine manyukireti, asi hazvisi zvese zvinojekesa zvinhu zvakanaka.

Mamwe manyukireti akajairika, akadai sesodium benzoate netalc, haaderedzi saizi yespherulite nehuwandu hwakakwana kuti ape chikamu chakaumbwa chisina hutsi uye chakajeka zvakanyanya. Kujeka kwakanyanya kunowanikwa kana manyukireti anonyungudika akashandiswa.

Zvinhu zvinonyunguduka zve organic zvinoshanda se clarifiers zvinosanganisira sorbitols, nonotols, trisamides.

Kunyangwe manyukireti aya achinyanya kushandiswa kuwana kujeka kwakanyanya uye mhute shoma, anovandudzawo hunhu hwemuviri uye anoderedza nguva yekutenderera.

Chimiro chezvikamu uye chiyero chezvikamu

Zvidimbu zveNucleant zvine maumbirwo akafanana netsono (seADK STAB NA-11) zvinogona kutungamira mukusiyana kwehuremu hwekupwanya muchina uye mativi akachinjika. Kupwanya uku kunogona kutungamira ku warpage muchikamu chekupedzisira. Zvidimbu zveNucleant zvine geometry yakatsetseka zvinogona kupa kupwanya kwakafanana munzira mbiri zvichitungamira ku warpage shoma.

Kugoverwa kweParticle Size & Particle Size

Kukura kwezvikamu zvidiki kunoita kuti masero emukati memasero ave nani, asi zvikamu zvidiki zvinogonawo kuoma kupararira. Zvimwe zvikamu zvezvikamu zvemukati memasero, zvakaita sesodium benzoate, zvinowanzo batanidzwazve.

Muchina wekubvisa asidhi wakashandiswa

Zvimwe zvinobvisa acid, zvakaita semafuta acid salts (semuenzaniso calcium stearate) zvinogona kurwisana nemamwe manucleants, akadai sephosphate esters uye sodium benzoate. Dihydrotalcite inofanira kushandiswa nemanucleants aya.

Usamboshandisa calcium stearate pamwe chete nesodium benzoate sezvo calcium stearate ichibvisa zvachose nucleation yesodium benzoate.

Dhigirii rekupararira & Kuvapo kweAgglomerates Dzisina Kupararira

Sodium benzoate inowanzogadzira ma agglomerates uye inonetsa kupararira zvakanaka.

Tembiricha yakanyunguduka

Sorbitols dzinoda tembiricha yakakwira yekunyunguduka kuti dzipe kujeka kwakanyanya, sezvo dzichifanira kunyunguduka zvizere mupolymer melt.

Kubatana uye Kusawirirana Pakati Pezvinhu Zvikuru Nezvimwe Zvinowedzera

Zvinobvisa acid zvinogona kuva zvinobatana kana zvinopesana. Mafuta acid munyu anokanganisa zvakanyanya modulus ye phosphate ester nucleated PP.

Sarudza KurudyiNucleantsuye Zvinojekesa zvePP

Usati wasarudza chinhu chakakodzera chekugadzirisa kana kujekesa purofiti yako yePP application, sarudza kuti ndeipi gadziriso yezvivakwa yaunonyanya kufarira:

a. Kana mhute shoma uye kujeka kwakanyanya kwakakosha, saka sarudza chimwe chezvinonyungudutsa zvinojekesa.

b. Kuti zvive nyore kunzwisisa,maester ephosphateinogona kushandiswa.

c.Kana modulus yakakwira ichikosha zvikuru, saka sarudza imwe yema phosphate esters.

d.Kana mutengo wakaderera uchikosha zvikuru, saka sarudza sodium benzoate.

e. Kana warpage shoma uye pigment sensitivity yakaderera zviri izvo zvinonyanya kukosha, saka sarudza munyu webicycloheptane.

Zvakakoshawo kusarudza kuti nucleant ichapinzwa sei muPP resin. Gara uchiongorora zvakakodzera kuti uve nechokwadi chekuti kupararira kwakanaka uye nucleation yawanikwa.

Shandisa DSC pane nucleated PP resin. Kuvandudzika kwenguva yekutenderera kunowanzoenderana nekuwedzera kwekupisa kwekristaro (Tc). Edza hunhu hwemuenzaniso wakaumbwa.

Kana muchida kubvunza nezvezvigadzirwa zvine chekuita nezvinoumba nucleating agents, ndapota inzwa wakasununguka kubvunzataura nesuchero nguva.