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Saameynta wakiilka nukleerka ee waxqabadka polymer iyo hordhaca nooca

Enlarged font  Narrow font Release date:2021-04-05  Source:Codsiyada caaga ah ee injineer  Browse number:295
Note: Wakiilka nukleerka wuxuu ku habboon yahay caagagga crystalline ee aan dhammaystirnayn sida polyetylen iyo polypropylene.

Wakiilka Nucleating

Wakiilka nukleerka wuxuu ku habboon yahay caagagga crystalline ee aan dhammaystirnayn sida polyetylen iyo polypropylene. Adoo badalaya habdhaqanka crystallization ee xarkaha, waxay dardar galin kartaa xaddiga crystallization, waxay kordhin kartaa cufnaanta madadaalada waxayna sare uqaadeysaa minaturization-ka cabirka badarka, si loo gaabiyo wareegga waxqabadka iyo hagaajinta hufnaanta iyo dusha sare Wax ku darida jirka ee jirka sifooyinka sida dhalaalka, xoogga siligga, qalafsanaanta, heerkulka dhalanrog kuleylka, iska caabinta saameynta, iyo caabbinta qulqulka leh.

Ku darista wakiilka nukliyeerka waxay kordhin kartaa xawaaraha crystallization iyo heerka crystallization ee sheyga polymer crystalline, kaliya ma kordhin karto xawaaraha waxqabadka iyo waxqabadka, laakiin sidoo kale waxay si weyn u yareyneysaa ifafaaleynta sare ee walxaha, taas oo hagaajinaysa xasiloonida cabirka sheyga .

Saameynta wakiilka nukleerka ee waxqabadka wax soo saarka

Isku-darka wakiilka nukleerka wuxuu hagaajiyaa astaamaha loo yaqaan 'crystalline' ee maaddada polymer-ka, taas oo saameyn ku yeelata sifooyinka jirka iyo habka wax-soo-saarka ee polymerka.

01 Saamayn ku yeelashada xoogga foosinta iyo xoogga foorarsiga

Wixii polymer crystalline ama semi-crystalline polymer, ku darista wakiilka nukleerka wuxuu faa'iido u leeyahay kordhinta crystallinity of polymer, oo inta badan wuxuu leeyahay saameyn xoojin ah, taas oo kordhisa adkaanshaha polymer, xoogga jihada iyo xoogga foorarsiga, iyo modulus , laakiin Dheellitirka xilliga nasashada guud ahaan wuu yaraadaa.

02 U adkaysiga awooda saameynta

Guud ahaan marka laga hadlayo, sare u qaadista culeyska foorarka ama foorarka maaddada, awoodda saameynta waxay u egtahay in lumo. Si kastaba ha noqotee, ku darista wakiilka nukleerka wuxuu yareyn doonaa cabbirka spherulite ee polymerka, sidaas darteed polymer wuxuu muujiyaa iska caabin saameyn wanaagsan leh. Tusaale ahaan, ku darista wakiil nucleer ku habboon PP ama PA alaabta ceeriin waxay kordhin kartaa xoogga saameynta maaddada 10-30%.

03 Saamaynta waxqabadka indhaha

Polymers-ka hufan ee dhaqanka sida PC ama PMMA guud ahaan waa polymers amorphous, halka polymers crystalline ama semi-crystalline ay yihiin guud ahaan mugdi. Isku-darka wakiilada nuugista wuxuu yareyn karaa cabbirka miraha polymer-ka wuxuuna leeyahay astaamaha qaab-dhismeedka microcrystalline. Waxay ka dhigi kartaa sheyga inuu muujiyo astaamaha translucent ama gebi ahaanba hufan, isla mar ahaantaana wuxuu hagaajin karaa dusha sare ee badeecada.

04 Saamaynta waxqabadka waxqabadka wax taaj oo kale polymer

In geeddi-socodka wax taaj oo kale polymer, maxaa yeelay, polymer dhalaalay leeyahay heerka qaboojinta dhakhso badan, iyo silsiladda polymer molecular aan si buuxda u crystallized, waxay keentaa yaraanshaha iyo qallooc inta lagu guda jiro geeddi socodka qaboojinta, iyo polymer aan dhammaystirnayn crystallized leeyahay xasilloonida cabbir liita. Sidoo kale way fududahay in la yareeyo cabbirka inta lagu gudajiro hawsha. Ku darista wakiil nuugista ayaa dardar gelin kara heerka crystallization, gaabin kara waqtiga waxqabadka, hagaajinta waxtarka wax soo saarka iyo yareynta heerka foosha kadib ee alaabta.

Noocyada wakiilka nukleerka

01 agent wakiilka nukleerka

 Waxay badanaa hagaajisaa hufnaanta, dhalaalka dusha sare, qallafsanaanta, kuleylka kuleylka, iwm. Waxaa sidoo kale loogu yeeraa wakiil hufan, xoojiya gudbiyaha, iyo qalajiye. Ugu badnaan waxaa ka mid ah dibenzyl sorbitol (dbs) iyo waxyaabaha ka dhalan kara, cusbada esterta fosfada leh, beddelka benzoates, iwm, gaar ahaan dbs nucleating wakiil hufan ayaa ah dalabka ugu badan. Waxyaabaha loo yaqaan 'Alpha crystal nucleating nucleus' waxaa loo qaybin karaa qayb aan dabiici ahayn, dabiici ah iyo macromolecules iyadoo loo eegayo qaabdhismeedkooda.

02 Wax aan dabiici ahayn

Waxyeeleyaasha nukleerka ee noolaha badanaa waxaa ka mid ah talc, kaalshiyamka oksaydhka, kaarboon madow, kaalshiyamka kaarboonaytka, mica, midabbo aan dabiici ahayn, kaolin iyo hadhaaga kalluumeysiga. Kuwani waa wakiiladii ugu horreeyay ee raqiis ah ee wax-ku-oolka ah ee la farsameeyay, iyo kuwa ugu cilmi-baarista badan uguna dhaqsaha badan ee la adeegsado waa talc, mica iwm

03 Noole

Cusbada macdanta Carboxylic acid: sida sodium succinate, sodium glutarate, sodium caproate, sodium 4-methylvalerate, adipic acid, aluminium adipate, aluminium tert-butyl benzoate (Al-PTB-BA), Aluminium benzoate, potassium benzoate, lithium benzoate, sodium cinnamate, sodium β-naphthoate, iwm Kuwaas waxaa ka mid ah, biraha alkali ama aluminium ee cusbada benzoic acid, iyo cusbada aluminium ee tert-butyl benzoate waxay leeyihiin saameyn wanaagsan waxayna leeyihiin taariikh dheer oo la adeegsado, laakiin daahfurnaanta ayaa liidata.

Cusbada biraha fosforica: fosfoorasyada dabiiciga ah badanaa waxaa ku jira cusbada biraha fosfateerka iyo fosfoorasyada biraha aasaasiga ah iyo iskudhafyadooda. Sida 2,2'-methylene bis (4,6-tert-butylphenol) phosphine cusbo aluminium (NA-21). Nooca noocan ah ee loo yaqaan 'nucleating agent' waxaa lagu gartaa hufnaan wanaagsan, qallafsanaan, xawaaraha crystallization, iwm, laakiin kala-firdhinta liidata.

Kala-soocidda 'Sorbitol benzylidene': Waxay leedahay saameyn wax ku ool ah oo horumarineed oo ku saabsan daahfurnaanta, dhalaalka dusha sare, qallafsanaanta iyo astaamaha kale ee kuleylka ee sheyga, waxayna leedahay iswaafajin wanaagsan PP. Waa nooc hufnaan ah oo hadda ku socota cilmi baaris qoto dheer. Wakiilka Nucleating. Iyada oo waxqabad wanaagsan iyo qiimo jaban, waxay noqotay wakiilka ugu firfircoon ee soosaaray nukleerka ee leh noocyada ugu waaweyn iyo wax soosaarka iyo iibka ugu badan dalka iyo dibaddaba. Inta badan waxaa jira dibenzylidene sorbitol (DBS), labo (p-methylbenzylidene) sorbitol (P-M-DBS), labo (p-chloro-bedel benzal) sorbitol (P-Cl-DBS) iyo wixii la mid ah.

Barta dhalaalaysa ee sareysa wakiilka polymerka: Waqtigaan la joogo, inta badan waxaa jira polycloyl cyclohexane, pentane polyetylen, ethylene / acrylate copolymer, iwm. Waxay leedahay guryo isku dhafan oo liita oo leh maadada polyolefin iyo kala firidh wanaagsan.

agent wakiilka nukleerka nukleerka:

Ujeeddadu waa in la helo alaabada polypropylene-ka oo leh nuxur qaab sare leh. Faa'iidada ayaa ah in la wanaajiyo caabbinta saameynta sheyga, laakiin ma yareyneyso ama xitaa ma kordhinayso heerkulka isbeddelka kuleylka ee badeecada, sidaa darteed labada dhinac ee iska hor imanaya ee iska caabinta saameynta iyo caabbinta kuleylka kuleylka ayaa lagu xisaabtamayaa.

Nooc ka mid ahi waa iskudhisyo faraantiyo isku dhafan oo qaab-dhismeed qaabaysan.

Midda kale waxay ka kooban tahay oksaydh, hydroxides iyo cusbada qaar ka mid ah asiidhyada dicarboxylic iyo biraha kooxda IIA ee miiska xilliyeed. Waxay wax ka beddeli kartaa saamiga noocyada kala duwan ee muraayadda ee polymerka si wax looga beddelo PP.



 
 
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