{"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\/pt\/the-difference-between-heavy-calcium-and-light-calcium-in-polymer-applications\/","title":{"rendered":"A diferen\u00e7a entre c\u00e1lcio pesado e c\u00e1lcio leve em aplica\u00e7\u00f5es de pol\u00edmeros"},"content":{"rendered":"

Carbonato de c\u00e1lcio<\/a> \u00e9 um enchimento amplamente utilizado em pl\u00e1sticos. Ele vem em duas formas principais: carbonato de c\u00e1lcio leve (carbonato de c\u00e1lcio precipitado) e carbonato de c\u00e1lcio pesado. O carbonato de c\u00e1lcio leve \u00e9 produzido quimicamente, enquanto o carbonato de c\u00e1lcio pesado \u00e9 feito por britagem e moagem mec\u00e2nica. Suas densidades s\u00e3o semelhantes \u2014 2,4\u20132,6 g\/cm\u00b3 para c\u00e1lcio leve e 2,6\u20132,9 g\/cm\u00b3 para c\u00e1lcio pesado. A principal diferen\u00e7a est\u00e1 em sua densidade aparente, que afeta como eles se acomodam em volume. O c\u00e1lcio leve normalmente tem um volume de sedimenta\u00e7\u00e3o acima de 2,5 mL\/g, enquanto o c\u00e1lcio pesado varia de 1,2 a 1,9 mL\/g, dependendo de sua forma cristalina e composi\u00e7\u00e3o qu\u00edmica.<\/p>\n\n\n\n

Part\u00edculas leves de carbonato de c\u00e1lcio geralmente t\u00eam o formato de caro\u00e7o de t\u00e2mara, com um di\u00e2metro longo de 5\u201312 \u03bcm, um di\u00e2metro curto de 1\u20133 \u03bcm e um tamanho m\u00e9dio de 2\u20133 \u03bcm. Sem tratamento de superf\u00edcie, essas part\u00edculas geralmente se aglomeram em grupos ap\u00f3s a secagem. Os padr\u00f5es nacionais avaliam a qualidade do c\u00e1lcio leve com base em res\u00edduos de peneira a 125 \u03bcm e 45 \u03bcm, o que n\u00e3o reflete totalmente o tamanho e a distribui\u00e7\u00e3o das part\u00edculas.<\/p>\n\n\n\n

Durante a britagem e moagem de carbonato de c\u00e1lcio pesado, os tamanhos das part\u00edculas variam, criando uma distribui\u00e7\u00e3o de pequena a grande dentro de uma faixa. A classifica\u00e7\u00e3o nos permite controlar o tamanho m\u00e1ximo do p\u00f3 e a distribui\u00e7\u00e3o do tamanho das part\u00edculas para atender \u00e0s necessidades de enchimento de pl\u00e1stico.<\/p>\n\n\n\n<\/p>\n

\"\"<\/figure>\n

\n\n\n\n

Ao comparar preenchimentos de c\u00e1lcio leves e pesados n\u00e3o tratados:<\/h2>\n\n\n\n

1. Diferen\u00e7as de sa\u00edda<\/strong>: <\/h3>\n\n\n\n

Substituir c\u00e1lcio pesado por c\u00e1lcio leve pode afetar o comprimento ou a \u00e1rea do produto. O c\u00e1lcio pesado pode resultar em uma \u00e1rea menor ou reduzida para o mesmo peso de mat\u00e9rias-primas, potencialmente levando a uma diminui\u00e7\u00e3o no valor do produto. Por exemplo, testes em tubos de PVC ultrafinos cheios de c\u00e1lcio pesado mostram um aumento de 4% no peso em compara\u00e7\u00e3o com o c\u00e1lcio leve. Em tubos de PVC de espuma sandu\u00edche, a densidade de tubos cheios de c\u00e1lcio pesado varia de 1,05 a 1,12 g\/cm\u00b3, em compara\u00e7\u00e3o com 0,96 g\/cm\u00b3 para c\u00e1lcio leve, mostrando aumentos de 9% a 17%. Sem medidas especiais, a substitui\u00e7\u00e3o de c\u00e1lcio leve por c\u00e1lcio pesado pode impactar negativamente as empresas de processamento.<\/p>\n\n\n\n

2. Pre\u00e7o<\/strong>:<\/h3>\n\n\n\n

O pre\u00e7o do c\u00e1lcio pesado varia significativamente pelo tamanho e distribui\u00e7\u00e3o das part\u00edculas. Por exemplo, os pre\u00e7os para c\u00e1lcio pesado de 1250 mesh, 800 mesh e 400 mesh podem diferir de 2 a 4 vezes do mesmo fabricante. O c\u00e1lcio leve est\u00e1 amplamente dispon\u00edvel e geralmente \u00e9 mais econ\u00f4mico. O c\u00e1lcio pesado, frequentemente transportado de regi\u00f5es como Guangxi, Sichuan e nordeste da China para o norte da China e prov\u00edncias costeiras, n\u00e3o oferece uma vantagem de pre\u00e7o sobre o c\u00e1lcio leve, exceto para o produto de 400 mesh. Portanto, o c\u00e1lcio pesado n\u00e3o tem um pre\u00e7o competitivo em compara\u00e7\u00e3o ao c\u00e1lcio leve, mesmo que o desempenho e o tamanho sejam compar\u00e1veis.<\/p>\n\n\n\n

3. Impacto do tamanho e distribui\u00e7\u00e3o das part\u00edculas em pl\u00e1sticos preenchidos<\/strong>: <\/h3>\n\n\n\n

Quanto mais fino o tamanho de part\u00edcula<\/a> de c\u00e1lcio pesado, melhor ser\u00e1 o desempenho do pl\u00e1stico preenchido. O c\u00e1lcio leve, com seu tamanho m\u00e9dio de part\u00edcula mais fino de alguns m\u00edcrons, oferece melhor dispers\u00e3o e desempenho superior em pl\u00e1sticos em compara\u00e7\u00e3o ao c\u00e1lcio pesado mais grosso. Para corresponder ao desempenho do c\u00e1lcio leve em produtos pl\u00e1sticos, o c\u00e1lcio pesado deve ter um tamanho de part\u00edcula pequeno.<\/p>\n\n\n\n

4. Desempenho de processamento<\/strong>: <\/h3>\n\n\n\n

O pl\u00e1stico PVC preenchido com c\u00e1lcio pesado tem melhor fluidez de processamento do que com c\u00e1lcio leve. O torque de equil\u00edbrio em PVC preenchido com c\u00e1lcio pesado ultrafino \u00e9 menor, e o tempo para atingir o equil\u00edbrio \u00e9 menor. Isso se deve ao formato irregular do bloco de part\u00edculas de c\u00e1lcio pesado. Elas s\u00e3o mais m\u00f3veis do que o c\u00e1lcio leve mais alongado. Isso ajuda com conex\u00f5es de tubos de PVC moldados por inje\u00e7\u00e3o e produtos de alto enchimento, como pisos de PVC e folhas de janelas de venezianas. Elas precisam de boa fluidez de processamento, o que tamb\u00e9m pode reduzir o uso de energia.<\/p>\n\n\n\n

5. Qualidade da superf\u00edcie do produto<\/strong>: <\/h3>\n\n\n\n

Produtos de PVC preenchidos com c\u00e1lcio leve t\u00eam um brilho de superf\u00edcie mais brilhante em compara\u00e7\u00e3o com aqueles preenchidos com c\u00e1lcio pesado. Para produtos como tubos, perfis e placas, o c\u00e1lcio leve d\u00e1 um acabamento brilhante melhor. Ele funciona bem para PVC macio usado em bainhas de fios e cabos. O c\u00e1lcio pesado finamente mo\u00eddo pode produzir uma boa superf\u00edcie. Mas, ele n\u00e3o corresponde ao brilho do c\u00e1lcio leve.<\/p>","protected":false},"excerpt":{"rendered":"

Carbonato de c\u00e1lcio \u00e9 um enchimento amplamente usado em pl\u00e1sticos. Ele vem em duas formas principais: carbonato de c\u00e1lcio leve (carbonato de c\u00e1lcio precipitado) e carbonato de c\u00e1lcio pesado. O carbonato de c\u00e1lcio leve \u00e9 produzido quimicamente, [\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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