{"id":14757,"date":"2024-08-13T08:55:15","date_gmt":"2024-08-13T08:55:15","guid":{"rendered":"https:\/\/www.jet-mills.com\/?p=14757"},"modified":"2024-12-17T08:42:44","modified_gmt":"2024-12-17T08:42:44","slug":"the-difference-between-heavy-calcium-and-light-calcium-in-polymer-applications","status":"publish","type":"post","link":"https:\/\/www.jet-mills.com\/it\/the-difference-between-heavy-calcium-and-light-calcium-in-polymer-applications\/","title":{"rendered":"La differenza tra calcio pesante e calcio leggero nelle applicazioni polimeriche"},"content":{"rendered":"

Carbonato di calcio<\/a> \u00e8 un riempitivo ampiamente utilizzato nelle materie plastiche. Si presenta in due forme principali: carbonato di calcio leggero (carbonato di calcio precipitato) e carbonato di calcio pesante. Il carbonato di calcio leggero \u00e8 prodotto chimicamente, mentre il carbonato di calcio pesante \u00e8 ottenuto tramite frantumazione e macinazione meccanica. Le loro densit\u00e0 sono simili: 2,4\u20132,6 g\/cm\u00b3 per il calcio leggero e 2,6\u20132,9 g\/cm\u00b3 per il calcio pesante. La differenza fondamentale \u00e8 nella loro densit\u00e0 apparente, che influenza il modo in cui si depositano in volume. Il calcio leggero ha in genere un volume di sedimentazione superiore a 2,5 mL\/g, mentre il calcio pesante varia da 1,2 a 1,9 mL\/g, a seconda della sua forma cristallina e della sua composizione chimica.<\/p>\n\n\n\n

Le particelle leggere di carbonato di calcio sono solitamente a forma di nocciolino di dattero, con un diametro lungo di 5-12 \u03bcm, un diametro corto di 1-3 \u03bcm e una dimensione media di 2-3 \u03bcm. Senza trattamento superficiale, queste particelle spesso si raggruppano in cluster dopo l'essiccazione. Gli standard nazionali valutano la qualit\u00e0 del calcio leggero in base ai residui del setaccio a 125 \u03bcm e 45 \u03bcm, che non riflettono completamente la dimensione e la distribuzione delle particelle.<\/p>\n\n\n\n

Durante la frantumazione e la macinazione del carbonato di calcio pesante, le dimensioni delle particelle variano, creando una distribuzione da piccola a grande entro un intervallo. La selezione ci consente di controllare la dimensione massima della polvere e la distribuzione delle dimensioni delle particelle per soddisfare le esigenze di riempimento della plastica.<\/p>\n\n\n\n<\/p>\n

\"\"<\/figure>\n

\n\n\n\n

Confrontando i riempitivi di calcio leggeri e pesanti non trattati:<\/h2>\n\n\n\n

1. Differenze di output<\/strong>: <\/h3>\n\n\n\n

Sostituire il calcio pesante con il calcio leggero pu\u00f2 influire sulla lunghezza o sull'area del prodotto. Il calcio pesante pu\u00f2 comportare un'area pi\u00f9 corta o ridotta per lo stesso peso di materie prime, portando potenzialmente a una diminuzione del valore del prodotto. Ad esempio, i test sui tubi in PVC ultra-fini riempiti di calcio pesante mostrano un aumento di peso di 4% rispetto al calcio leggero. Nei tubi in PVC espanso sandwich, la densit\u00e0 dei tubi riempiti con calcio pesante varia da 1,05 a 1,12 g\/cm\u00b3, rispetto a 0,96 g\/cm\u00b3 per il calcio leggero, mostrando aumenti di 9% a 17%. Senza misure speciali, la sostituzione del calcio leggero con calcio pesante pu\u00f2 avere un impatto negativo sulle aziende di trasformazione.<\/p>\n\n\n\n

2. Prezzo<\/strong>:<\/h3>\n\n\n\n

Il prezzo del calcio pesante varia notevolmente in base alla dimensione delle particelle e alla distribuzione. Ad esempio, i prezzi per il calcio pesante da 1250 mesh, 800 mesh e 400 mesh possono differire da 2 a 4 volte rispetto allo stesso produttore. Il calcio leggero \u00e8 ampiamente disponibile e generalmente pi\u00f9 conveniente. Il calcio pesante, spesso trasportato da regioni come Guangxi, Sichuan e Cina nord-orientale alla Cina settentrionale e alle province costiere, non offre un vantaggio di prezzo rispetto al calcio leggero, fatta eccezione per il prodotto da 400 mesh. Pertanto, il calcio pesante non ha un prezzo competitivo rispetto al calcio leggero, anche se prestazioni e dimensioni sono comparabili.<\/p>\n\n\n\n

3. Impatto della dimensione e della distribuzione delle particelle sulle plastiche riempite<\/strong>: <\/h3>\n\n\n\n

Pi\u00f9 fine \u00e8 il dimensione delle particelle<\/a> di calcio pesante, migliore \u00e8 la prestazione della plastica riempita. Il calcio leggero, con la sua dimensione media delle particelle pi\u00f9 fine di pochi micron, offre una migliore dispersione e prestazioni superiori nelle plastiche rispetto al calcio pesante pi\u00f9 grossolano. Per eguagliare le prestazioni del calcio leggero nei prodotti in plastica, il calcio pesante deve avere una piccola dimensione delle particelle.<\/p>\n\n\n\n

4. Prestazioni di elaborazione<\/strong>: <\/h3>\n\n\n\n

La plastica in PVC riempita con calcio pesante ha una migliore fluidit\u00e0 di lavorazione rispetto al calcio leggero. La coppia di equilibrio nel PVC riempito con calcio pesante ultrafine \u00e8 inferiore e il tempo per raggiungere l'equilibrio \u00e8 pi\u00f9 breve. Ci\u00f2 \u00e8 dovuto alla forma irregolare del blocco delle particelle di calcio pesante. Sono pi\u00f9 mobili del calcio leggero pi\u00f9 allungato. Ci\u00f2 \u00e8 utile con i raccordi per tubi in PVC stampati a iniezione e i prodotti ad alto riempimento, come i pavimenti in PVC e le lastre per finestre a persiana. Hanno bisogno di una buona fluidit\u00e0 di lavorazione, che pu\u00f2 anche ridurre il consumo di energia.<\/p>\n\n\n\n

5. Qualit\u00e0 della superficie del prodotto<\/strong>: <\/h3>\n\n\n\n

I prodotti in PVC riempiti con calcio leggero hanno una superficie lucida pi\u00f9 brillante rispetto a quelli riempiti con calcio pesante. Per prodotti come tubi, profili e piastre, il calcio leggero offre una finitura lucida migliore. Funziona bene per il PVC morbido utilizzato nelle guaine di fili e cavi. Il calcio pesante finemente macinato pu\u00f2 produrre una buona superficie. Tuttavia, non eguaglia la lucentezza del calcio leggero.<\/p>","protected":false},"excerpt":{"rendered":"

Il carbonato di calcio \u00e8 un riempitivo ampiamente utilizzato nelle materie plastiche. Si presenta in due forme principali: carbonato di calcio leggero (carbonato di calcio precipitato) e carbonato di calcio pesante. Il carbonato di calcio leggero \u00e8 prodotto chimicamente, [\u2026]<\/p>","protected":false},"author":2,"featured_media":14759,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[42],"tags":[],"class_list":["post-14757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"yoast_head":"\nThe difference between heavy calcium and light calcium in polymer applications<\/title>\n<meta name=\"description\" content=\"Calcium carbonate\u00a0is a widely used filler in plastics. 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