Powder coating pigments should choose what

introduction
     Sea epitaxial powder coating the early stage of development,because of the lack of information,when choosing paint and color no prevention by solvent paint,printing ink and the impact of plastics industry experience.With the explosive development of the industry,the relevant knowledge and information is abundant,the powder coating targeted when choosing paint more and more strong,the scale is more and more high,assuming that strangers all kinds of pigment chemical composition and related defy,in the face of thousands of one hundred kinds of pigment type will be unable to agree,lead to the color on the high side resources use the application or not.Correctly choose to paint the foundation of the roots is correct for color matching.To this end,this paper focus on the most widely used and most types of pigments for the colleague reference.
     The classification of the pigment and defy pigment classification can adopt a variety of approaches,well-known ColorIndex pigment (color index) divided into pigment yellow (PY),orange pigment (PO),pigment red (PR),and the purple pigment (PV),pigment blue (PB),brown pigment (PBr),paint black white (PBk),paint (PW),metallic pigment (PM) and so on several major categories.The chemical composition of paint for its function of selective effect.Pigment according to the chemical composition can be divided into two broad categories,inorganic pigments and organic pigments,inorganic pigments can be subdivided into corrosion,and sulfide,chromate,vanadate molybdate,metal,etc.;Organic pigments can be subdivided into azo pigments,phthalocyanine pigment,polycyclic pigments and other pigments,etc.Coating price pigments used for bending not only has nothing to do with factors such as paint my authority,but also with the material being shaded (medium) related to the physical property [2].The use of the most cordial relations with powder coating to briefly as follows,so that when choosing paint to contemplate.
     Color color is the most basic paint for bending,people to paint can be divided into several categories such as red,yellow,blue.Pigment is tonal first by the chemical structure and crystal type choice,and particle size of hue.When it comes to color choice chroma or saturation title,known as delicate and charming.Chroma is one of the attributes of hue,show the color deviation is same gray degree,it depends on the pigment of light waves reflected selective height,the higher the selectivity,the higher the chroma.The highest of all kinds of monochromatic light is visible light chroma.In the actual color,can use high chroma pigment distribution of the colour of low chroma,not the opposite.Some use of organic pigment out board,no matter how to increase the dosage with inorganic pigments can't call out,is due to the low chroma inorganic pigments.Some rated bright-coloured printing ink or paint swatches,powder coating can't call out,this is because in the powder coating pigment concentration is low,and much higher curing temperature will not heat.
     Tinting strength tinting strength is also called the tinting strength,is that being shaded objects have color pigment educate.It first depends on the chemical organ,but also related to such factors as the crystal shape,particle size.
     Hidden force covering power refers to the covered substrate and coating limit through the bright,its optical nature of pigments and medium refractive index difference,the greater the difference between the stronger the hidden force,also to attract the more educate pigments light (e.g., dark look) the hidden force is stronger.For the same pigment, particle size and particle shape affects the cover.
     Primary heat resistance and heat resistance type and related chemical authority,also related to such factors as the particle size,pigment outline freedom,the rest of the many pigments diluted heat resistance after landing.
     Light fastness and weather resistance to light reflecting pigments at the levels of light turn dark,fade,from serious to fine divided into grade 1~8,8 best reveal light fastness.Weather more one-sided reflecting pigments in outdoor natural premise of fastness,divided into 1~5 from worst to best.Paint first depends on the light fastness and weather resistance of chemical mechanism,and crystal shape, particle size,disposal is involved also in appearance,a lot of paint dilute after light fastness and weather resistance.
     Toxicity of toxic reach's sphere is very wide,including acute toxicity,stimulation of the skin and mucous membranes,allergies,subacute toxicity,chronic toxicity and mutagenic and carcinogenic [4].Gap between the country standard of toxicity restriction is consistent,gap purpose of toxicity limit standard difference,too.Generally,the inorganic pigment mainly limit the content of heavy metals,occasionally is the limit of total content,not occasionally is restricted to a small piece of content.Of organic pigments is mainly restrict some aromatic amine and the content of the content such as polychlorinated biphenyl (PCB),they are generally as intermediates,solvents or vice manufacture objects exist in yan estimates.According to the part of the pigment type or rational formula can largely be know whether some pigments containing heavy metals,but considering the pigments and fillers,or heavy metal impurities,in strict application occasions should also be sent to the power giant inspection department inspection.For inorganic pigment,only from the part type is difficult to resolute has non-toxic,even knew structure type,also means less know or toxic solvents
     Select the general principles of the pigments
     Static for dealing with pigment has to paint the main noise source has 3: professional,paint supplier,books and periodicals.Professionals are among the industry or relative to the senior colourist in factory.At the beginning of the development of powder coatings,coating colourist if other large professional staff in the industry.In lessons to other sectors of education must be treated with caution,such as red C (C) lake red all over used in plastic industry,has been introduced into the powder coating for the early.But C red heat as long as about 140 e,used for allocation of large color,dark brown,light colors such as red powder used for distribution is not suitable,because the baking temperature and time of perverse effect on color is too big.Come from the dynamic pigment providers (search data and color card) is also very necessary,but should pay attention to its rough and practical. Pigment raw defy parameters provided by the production enterprise and color card is always based on other media system,for the activity should be through the test to verify.The books and periodicals is to obtain the yan
     To come to select one of the error of the pigment powder coating is the user means less to toning,can bring up the customer's requirement is tonal,often become a key topic.This has not only reach the level of color,but also depends on the pigment is correct.Resolution to choose paint),however,is often not a colourist room,but some other people.Colourist a main task,that is,from where the sales and management staff lose enough audio (includes resource's sphere,fastness,insurance application,etc.),so as to establish a reasonable color scheme [3].First consider the cost,fastness and safe applications.
     Set up the color matching system,people always look forward to using or less pigment to bring up may or many tonal,like the three color or four color printing futile,but in theory,any a group of primary color gamut of response.For powder coating,due to the high curing temperature,concentration of pigment low limit,want to use a large number of several kinds of pigments as primary color to complete all the color matching task is difficult,also not necessarily is the economy.Whether to adopt computer color matching those of artificial color,coating price should choose the appropriate number,reasonable price and hue dress clothing dyes to color the task,relative to the stability of the color matching system,it is particularly unlucky for a purpose.
     Pigments in powder coatings used on the basis of general application of powder coating,DianMo refer to unrelated book,reference DIC,BASF,Ciba,Claiant,hangzhou lily,jiangsu double joy,Ryan treasure source companies such as related data,knot,the author more than 10 years experience in powder coating task,select some practical pigments in powder coatings.
Conclusion
     Small batch,the color is a feature of collecting powder coating production,conform to the customer the application of color matching of powder coatings accurately match is required.Correctly choose paint not only is the precondition of smoothly finish color,dot also from manufacturing advantages.

By Nicole