{"id":14757,"date":"2024-08-13T08:55:15","date_gmt":"2024-08-13T08:55:15","guid":{"rendered":"https:\/\/www.epicmicron.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.epicmicron.com\/fr\/the-difference-between-heavy-calcium-and-light-calcium-in-polymer-applications\/","title":{"rendered":"La diff\u00e9rence entre le calcium lourd et le calcium l\u00e9ger dans les applications polym\u00e8res"},"content":{"rendered":"

Carbonate de calcium<\/a> est une charge largement utilis\u00e9e dans les plastiques. Il existe sous deux formes principales : le carbonate de calcium l\u00e9ger (carbonate de calcium pr\u00e9cipit\u00e9) et le carbonate de calcium lourd. Le carbonate de calcium l\u00e9ger est produit chimiquement, tandis que le carbonate de calcium lourd est fabriqu\u00e9 par concassage et broyage m\u00e9caniques. Leurs densit\u00e9s sont similaires : 2,4 \u00e0 2,6 g\/cm\u00b3 pour le calcium l\u00e9ger et 2,6 \u00e0 2,9 g\/cm\u00b3 pour le calcium lourd. La principale diff\u00e9rence r\u00e9side dans leur densit\u00e9 apparente, qui affecte la fa\u00e7on dont ils se d\u00e9posent en volume. Le calcium l\u00e9ger a g\u00e9n\u00e9ralement un volume de s\u00e9dimentation sup\u00e9rieur \u00e0 2,5 ml\/g, tandis que le calcium lourd varie de 1,2 \u00e0 1,9 ml\/g, selon sa forme cristalline et sa composition chimique.<\/p>\n\n\n\n

Les particules l\u00e9g\u00e8res de carbonate de calcium ont g\u00e9n\u00e9ralement la forme d'un noyau de datte, avec un diam\u00e8tre long de 5 \u00e0 12 \u03bcm, un diam\u00e8tre court de 1 \u00e0 3 \u03bcm et une taille moyenne de 2 \u00e0 3 \u03bcm. Sans traitement de surface, ces particules s'agglutinent souvent en amas apr\u00e8s s\u00e9chage. Les normes nationales \u00e9valuent la qualit\u00e9 du calcium l\u00e9ger en fonction des r\u00e9sidus de tamisage \u00e0 125 \u03bcm et 45 \u03bcm, ce qui ne refl\u00e8te pas enti\u00e8rement la taille et la distribution des particules.<\/p>\n\n\n\n

Lors du broyage et du concassage du carbonate de calcium lourd, la taille des particules varie, cr\u00e9ant une distribution de petite \u00e0 grande dans une certaine plage. Le tri nous permet de contr\u00f4ler la taille maximale de la poudre et la distribution granulom\u00e9trique pour r\u00e9pondre aux besoins de remplissage en plastique.<\/p>\n\n\n\n<\/p>\n

\"\"<\/figure>\n

\n\n\n\n

En comparant les charges calciques l\u00e9g\u00e8res et lourdes non trait\u00e9es :<\/h2>\n\n\n\n

1. Diff\u00e9rences de sortie<\/strong>: <\/h3>\n\n\n\n

Le remplacement du calcium l\u00e9ger par du calcium lourd peut affecter la longueur ou la surface du produit. Le calcium lourd peut entra\u00eener une surface plus courte ou r\u00e9duite pour le m\u00eame poids de mati\u00e8res premi\u00e8res, ce qui peut entra\u00eener une diminution de la valeur du produit. Par exemple, des tests sur des tuyaux en PVC ultrafins remplis de calcium lourd montrent une augmentation de poids de 4% par rapport au calcium l\u00e9ger. Dans les tuyaux en PVC mousse sandwich, la densit\u00e9 des tuyaux remplis de calcium lourd varie de 1,05 \u00e0 1,12 g\/cm\u00b3, contre 0,96 g\/cm\u00b3 pour le calcium l\u00e9ger, montrant des augmentations de 9% \u00e0 17%. Sans mesures sp\u00e9ciales, le remplacement du calcium l\u00e9ger par du calcium lourd peut avoir un impact n\u00e9gatif sur les entreprises de transformation.<\/p>\n\n\n\n

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

Le prix du calcium lourd varie consid\u00e9rablement en fonction de la taille et de la distribution des particules. Par exemple, les prix du calcium lourd de 1\u00a0250 mesh, 800 mesh et 400 mesh peuvent diff\u00e9rer de 2 \u00e0 4 fois chez le m\u00eame fabricant. Le calcium l\u00e9ger est largement disponible et g\u00e9n\u00e9ralement plus rentable. Le calcium lourd, souvent transport\u00e9 depuis des r\u00e9gions comme le Guangxi, le Sichuan et le nord-est de la Chine vers le nord de la Chine et les provinces c\u00f4ti\u00e8res, n'offre pas d'avantage de prix par rapport au calcium l\u00e9ger, \u00e0 l'exception du produit de 400 mesh. Ainsi, le calcium lourd n'est pas comp\u00e9titif par rapport au calcium l\u00e9ger, m\u00eame si les performances et la taille sont comparables.<\/p>\n\n\n\n

3. Impact de la taille et de la distribution des particules sur les plastiques charg\u00e9s<\/strong>: <\/h3>\n\n\n\n

Plus le taille des particules<\/a> Plus le calcium est lourd, plus les performances du plastique charg\u00e9 sont bonnes. Le calcium l\u00e9ger, avec sa taille moyenne de particules plus fine de quelques microns, offre une meilleure dispersion et des performances sup\u00e9rieures dans les plastiques par rapport au calcium lourd plus grossier. Pour \u00e9galer les performances du calcium l\u00e9ger dans les produits en plastique, le calcium lourd doit avoir une petite taille de particules.<\/p>\n\n\n\n

4. Performances de traitement<\/strong>: <\/h3>\n\n\n\n

Le PVC charg\u00e9 de calcium lourd a une meilleure fluidit\u00e9 de traitement que le PVC l\u00e9ger. Le couple d'\u00e9quilibre du PVC charg\u00e9 de calcium lourd ultrafin est plus faible et le temps n\u00e9cessaire pour atteindre l'\u00e9quilibre est plus court. Cela est d\u00fb \u00e0 la forme irr\u00e9guli\u00e8re des blocs de particules de calcium lourd. Elles sont plus mobiles que le calcium l\u00e9ger plus allong\u00e9. Cela est utile pour les raccords de tuyaux en PVC moul\u00e9s par injection et les produits \u00e0 haut remplissage, comme les rev\u00eatements de sol en PVC et les feuilles de fen\u00eatres \u00e0 persiennes. Ils ont besoin d'une bonne fluidit\u00e9 de traitement, ce qui peut \u00e9galement r\u00e9duire la consommation d'\u00e9nergie.<\/p>\n\n\n\n

5. Qualit\u00e9 de la surface du produit<\/strong>: <\/h3>\n\n\n\n

Les produits en PVC charg\u00e9s de calcium l\u00e9ger ont une surface plus brillante que ceux charg\u00e9s de calcium lourd. Pour les produits tels que les tuyaux, les profil\u00e9s et les plaques, le calcium l\u00e9ger donne une meilleure finition brillante. Il fonctionne bien pour le PVC souple utilis\u00e9 dans les gaines de fils et de c\u00e2bles. Le calcium lourd finement broy\u00e9 peut produire une bonne surface. Mais il n'atteint pas la brillance du calcium l\u00e9ger.<\/p>","protected":false},"excerpt":{"rendered":"

Le carbonate de calcium est une charge largement utilis\u00e9e dans les plastiques. Il existe sous deux formes principales : le carbonate de calcium l\u00e9ger (carbonate de calcium pr\u00e9cipit\u00e9) et le carbonate de calcium lourd. Le carbonate de calcium l\u00e9ger est produit chimiquement, [\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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