Les pigments organiques sont des colorants importants, omnipr\u00e9sents dans notre vie. Cet article explique ce que sont les pigments organiques en les divisant en six points cl\u00e9s :<\/p>\n\n\n\n
\n
D\u00e9finition des pigments organiques<\/strong><\/li>\n\n\n\n
Caract\u00e9ristiques des pigments organiques<\/strong><\/li>\n\n\n\n
Propri\u00e9t\u00e9s des couleurs<\/strong><\/li>\n\n\n\n
Classification des pigments organiques<\/strong><\/li>\n\n\n\n
Applications des pigments organiques<\/strong><\/li>\n\n\n\n
Historique et tendances du d\u00e9veloppement<\/strong><\/li>\n<\/ol>\n\n\n\n<\/figure>\n\n\n\n
D\u00e9finition des pigments organiques<\/strong><\/strong><\/p>\n\n\n\n
Les pigments organiques sont une classe de colorants fabriqu\u00e9s \u00e0 partir de compos\u00e9s organiques qui poss\u00e8dent un \u00e9ventail de propri\u00e9t\u00e9s pigmentaires. Contrairement aux colorants, les pigments organiques n'ont pas d'affinit\u00e9 avec les objets qu'ils sont cens\u00e9s colorer. Ils n\u00e9cessitent des adh\u00e9sifs ou des substances filmog\u00e8nes pour adh\u00e9rer aux surfaces ou \u00eatre incorpor\u00e9s dans les objets afin de leur donner de la couleur.<\/p>\n\n\n\n<\/figure>\n\n\n\n
Les pigments organiques sont insolubles dans l'eau ou les solvants. Cependant, toutes les substances organiques insolubles ne peuvent pas \u00eatre utilis\u00e9es comme pigments organiques. Les pigments organiques colorent les objets en dispersant de fines particules dans le milieu qu'ils sont cens\u00e9s colorer. Par cons\u00e9quent, leur performance d\u00e9pend non seulement de leur structure chimique, mais aussi des facteurs suivants :<\/p>\n\n\n\n
- Taille et distribution des particules de pigments<\/strong><\/strong><\/p>\n\n\n\n
- \u00c9tat physique de la surface des particules<\/strong><\/strong><\/p>\n\n\n\n
- Polarit\u00e9 et forme des cristaux<\/strong><\/strong><\/p>\n\n\n\n
- Compatibilit\u00e9 avec le support<\/strong><\/p>\n\n\n\n
De nombreux fabricants de pigments, tout en d\u00e9veloppant de nouvelles vari\u00e9t\u00e9s structurelles, se consacrent \u00e9galement \u00e0 la recherche sur les propri\u00e9t\u00e9s de surface des pigments. Ils s'efforcent de mettre au point des produits dot\u00e9s de diverses propri\u00e9t\u00e9s, telles qu'une dispersion ais\u00e9e, une grande transparence, un pouvoir colorant \u00e9lev\u00e9 et une excellente fluidit\u00e9, afin d'am\u00e9liorer la qualit\u00e9 des produits.<\/p>\n\n\n\n
Les propri\u00e9t\u00e9s des pigments comprennent la r\u00e9sistance \u00e0 la lumi\u00e8re du soleil, l'immersion dans l'eau, la r\u00e9sistance aux acides et aux alcalis, la r\u00e9sistance aux solvants organiques, la r\u00e9sistance \u00e0 la chaleur, la stabilit\u00e9 cristalline, la dispersibilit\u00e9 et le pouvoir couvrant.<\/p>\n\n\n\n
Caract\u00e9ristiques des pigments organiques<\/strong><\/strong><\/p>\n\n\n\n
-Processus de production :<\/strong> Les interm\u00e9diaires, l'\u00e9quipement et les processus de synth\u00e8se n\u00e9cessaires \u00e0 leur production sont similaires \u00e0 ceux utilis\u00e9s dans la production de colorants, de sorte qu'ils sont souvent produits au sein de l'industrie des colorants.<\/p>\n\n\n\n
-Comparaison avec les pigments inorganiques :<\/strong><\/strong><\/p>\n\n\n\n
- Avantages : Ils ont g\u00e9n\u00e9ralement un pouvoir colorant \u00e9lev\u00e9, sont faciles \u00e0 broyer et \u00e0 disperser, sont moins sujets \u00e0 la s\u00e9dimentation et ont des couleurs vives.<\/p>\n\n\n\n
- Inconv\u00e9nients : Ils sont g\u00e9n\u00e9ralement peu r\u00e9sistants \u00e0 la lumi\u00e8re, \u00e0 la chaleur et aux intemp\u00e9ries.<\/p>\n\n\n\n
- Applications : Ils sont couramment utilis\u00e9s pour colorer des mat\u00e9riaux tels que les encres, les rev\u00eatements, les produits en caoutchouc, les plastiques, la papeterie et les mat\u00e9riaux de construction.<\/p>\n\n\n\n<\/figure>\n\n\n\n
Propri\u00e9t\u00e9s chromatiques des pigments organiques<\/strong><\/strong><\/p>\n\n\n\n
- Couleurs vives et fort pouvoir colorant<\/p>\n\n\n\n
- Faible densit\u00e9 et non-toxicit\u00e9<\/p>\n\n\n\n
- Toutefois, certaines vari\u00e9t\u00e9s ne sont souvent pas aussi r\u00e9sistantes \u00e0 la lumi\u00e8re, \u00e0 la chaleur, aux solvants et \u00e0 la migration que les pigments inorganiques.<\/p>\n\n\n\n
La vari\u00e9t\u00e9 des couleurs est infinie et color\u00e9e. Chaque couleur peut \u00eatre d\u00e9termin\u00e9e par trois param\u00e8tres :<\/p>\n\n\n\n
(1) Teinte : La caract\u00e9ristique qui distingue les couleurs les unes des autres et qui permet de distinguer le rouge, le jaune, le vert, le bleu, le violet, etc.<\/p>\n\n\n\n
(2) Luminosit\u00e9 (brightness) : La valeur caract\u00e9ristique qui indique le changement dans la clart\u00e9 et l'obscurit\u00e9 de la surface d'un objet.<\/p>\n\n\n\n
(3) Saturation (chroma) : Valeur caract\u00e9ristique qui indique l'intensit\u00e9 de la couleur \u00e0 la surface d'un objet.<\/p>\n\n\n\n
Les couleurs de la nature varient constamment, mais les plus \u00e9l\u00e9mentaires sont les trois couleurs primaires : le rouge, le jaune et le bleu.<\/p>\n\n\n\n<\/figure>\n\n\n\n
Classification des pigments organiques <\/strong><\/strong><\/p>\n\n\n\n
Il existe de nombreuses vari\u00e9t\u00e9s de pigments organiques et de nombreuses m\u00e9thodes de classification :<\/p>\n\n\n\n
\n
Classification par spectre de couleurs Classification en pigments jaunes, orange, rouges, violets, bruns, bleus, verts, etc.<\/li>\n<\/ul>\n\n\n\n<\/figure>\n\n\n\n
\n
Classification par fonction Classification en pigments ordinaires, pigments fluorescents, pigments nacr\u00e9s, pigments modificateurs de couleur, etc.<\/li>\n\n\n\n
Classification par objet d'application Classification en pigments pour rev\u00eatements, pigments pour encres, pigments pour plastiques et caoutchouc, pigments pour cosm\u00e9tiques, etc.<\/li>\n\n\n\n
Classification par structure mol\u00e9culaire<\/li>\n<\/ul>\n\n\n\n
Pigments azo\u00efques : Pigments contenant un groupe azo\u00efque (-N=N-)<\/p>\n\n\n\n
Pigments de phtalocyanine : tels que le bleu de phtalocyanine et le vert de phtalocyanine.<\/p>\n\n\n\n
Note : Les pigments azo\u00efques et les pigments de phtalocyanine repr\u00e9sentent plus de 90% de tous les pigments organiques et sont principalement produits en Europe occidentale, aux \u00c9tats-Unis et au Japon.<\/p>\n\n\n\n
Applications des pigments organiques<\/strong><\/strong><\/p>\n\n\n\n
En raison de leurs excellentes propri\u00e9t\u00e9s, les pigments organiques sont largement utilis\u00e9s dans de nombreuses industries :<\/p>\n\n\n\n
- Industrie des encres : L'un des plus grands domaines d'application, en particulier les encres d'imprimerie (offset, flexographie et h\u00e9liogravure), qui n\u00e9cessitent des couleurs vives, un pouvoir colorant \u00e9lev\u00e9, des particules fines et une excellente dispersibilit\u00e9.<\/p>\n\n\n\n
- Industrie des rev\u00eatements : Utilis\u00e9 dans diverses peintures et rev\u00eatements, en particulier dans les peintures automobiles, industrielles et ext\u00e9rieures, o\u00f9 la r\u00e9sistance aux intemp\u00e9ries et \u00e0 la lumi\u00e8re est essentielle.<\/p>\n\n\n\n<\/figure>\n\n\n\n
- Industrie des plastiques : Utilis\u00e9s pour colorer divers plastiques, les pigments doivent pr\u00e9senter une excellente r\u00e9sistance \u00e0 la chaleur (150\u00b0C-280\u00b0C), une r\u00e9sistance \u00e0 la migration et une bonne dispersibilit\u00e9.<\/p>\n\n\n\n
- Fibre textile : Gr\u00e2ce \u00e0 la coloration en suspension, les pigments sont m\u00e9lang\u00e9s uniform\u00e9ment aux polym\u00e8res fondus, puis fil\u00e9s pour produire des fibres color\u00e9es.<\/p>\n\n\n\n
- Applications cosm\u00e9tiques : Applications dans les ombres \u00e0 paupi\u00e8res, les rouges \u00e0 l\u00e8vres et les vernis \u00e0 ongles en gel. Les pigments organiques offrent une large gamme de couleurs vives, notamment le rouge, le bleu de phtalocyanine et le vert de phtalocyanine. Les pigments organiques offrent un excellent pouvoir colorant et une grande stabilit\u00e9 des couleurs, ce qui permet aux vernis \u00e0 ongles en gel d'obtenir des couleurs \u00e9clatantes.<\/p>\n\n\n\n<\/figure>\n\n\n\n
- Autres domaines : produits en caoutchouc, cuir, papeterie, c\u00e9ramique, emballage alimentaire, emballage pharmaceutique, jouets pour enfants, papeterie, etc.<\/p>\n\n\n\n
Historique et tendances du d\u00e9veloppement<\/strong><\/strong><\/p>\n\n\n\n
Le d\u00e9veloppement des pigments organiques s'est d\u00e9roul\u00e9 en gros en trois \u00e9tapes :<\/p>\n\n\n\n
(1) Exploration pr\u00e9coce (fin du 19e si\u00e8cle-d\u00e9but du 20e si\u00e8cle) : En 1856, William Perkin synth\u00e9tise le premier colorant organique, le \"violet d'aniline\", qui marque le d\u00e9but de l'\u00e8re des pigments organiques synth\u00e9tiques.<\/p>\n\n\n\n
(2) D\u00e9veloppement rapide (ann\u00e9es 1920-1960) : L'essor de l'industrie de l'impression couleur a favoris\u00e9 le d\u00e9veloppement des pigments azo\u00efques traditionnels et des pigments de phtalocyanine.<\/p>\n\n\n\n
(3) Modernisation et diversification (des ann\u00e9es 1980 \u00e0 nos jours) : Les progr\u00e8s des disciplines fondamentales ont favoris\u00e9 l'essor de la technologie des pigments organiques, et l'invention des pigments DPP constitue une \u00e9tape importante.<\/p>\n\n\n\n
L'\u00e9volution future des pigments organiques se refl\u00e8te principalement dans.. :<\/strong><\/p>\n\n\n\n
- Haute performance :<\/strong> D\u00e9velopper des pigments qui peuvent mieux r\u00e9sister \u00e0 des environnements difficiles (tels que des temp\u00e9ratures plus \u00e9lev\u00e9es et des rayons ultraviolets plus intenses).<\/p>\n\n\n\n
- Protection de l'environnement et s\u00e9curit\u00e9 : <\/strong>D\u00e9veloppement de pigments organiques respectueux de l'environnement, moins toxiques et ne contenant pas de m\u00e9taux lourds ni d'amines aromatiques nocives<\/p>\n\n\n\n
D\u00e9veloppement de nouveaux mat\u00e9riaux : <\/strong>Par exemple, l'exploration de nanopigments hybrides organiques-inorganiques d\u00e9riv\u00e9s de plantes naturelles.<\/p>\n\n\n\n
R\u00e9sum\u00e9<\/strong><\/p>\n\n\n\n
Les pigments organiques, colorants indispensables \u00e0 l'industrie et \u00e0 la vie modernes, se pr\u00e9sentent sous une grande vari\u00e9t\u00e9 de types, avec des propri\u00e9t\u00e9s diverses et un large \u00e9ventail d'applications. Ils permettent de cr\u00e9er des couleurs \u00e9clatantes, qu'il s'agisse de plastiques et de mat\u00e9riaux imprim\u00e9s courants ou de rev\u00eatements automobiles exigeants, de plastiques techniques ou de cosm\u00e9tiques.<\/p>\n\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
Organic pigments are important colorants, ubiquitous in our lives. This article will explain what organic pigments are by dividing them into six key points: Definition of Organic Pigments Organic pigments are a class of colorants made from organic compounds that possess a range of pigmentary properties. Unlike dyes, organic pigments lack affinity for the objects […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8934","post","type-post","status-publish","format-standard","hentry","category-gel-polish"],"yoast_head":"\n
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