GB 13451.2-1992 着色颜料相对着色力和白色颜料相对散射力的测定

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1、NationalStandardofthePeople’sRepublicofChinaDeterminationofrelativetintingstrengthofcoloredpigmentsandrelativescatteringpowerofwhitepigments—PhotometricmethodsGB/T13451.2-92ThisstandardadoptsequivalentlytheISO787/24-1985’Generalmethodsoftestforpigmentsandextenders;

2、Part24:Determinationofrelativetintingstrengthofcoloredpigmentsandrelativescatteringpowerofwhitepigments—Photometricmethods’.1.Contentandapplicationscope:Thisstandardregulatesthegeneraltestmethodusingphotometertodeterminethe2samepigments’relativetintingpowerand2same

3、whitepigmentsrelativescatteringpower.Whenthisgeneralmethodisunfitforsomespecificproducts,thenshouldregulateonespecialmethodtodeterminerelativetintingstrengthandrelativescatteringpowerofwhitepigments.2.Referencestandard;GB5211.16Comparisonoflightingpowerofwhitepigme

4、ntsGB5211.19Determinationofrelativetintingstrengthandcolouronreductionofcolouredpigments—visualcomparisonmethod.GB9285Rawmaterialsforpaintsandvarnishes—Sampling3.Definition3.1Tintingstrength:theabilityofpigmentstoabsorbincomelight,soitcanhavetheability,forexample,l

5、ettheaddedwhitecolouepigmentscoloredorcolourbecomedark.3.2Absorptionindex：lightabsorptionfactorofthecoloredbinder÷densityofpigmentsCm.Where:--spectralabsorptionfactor,colouredpigments’amountinmaterial,unittobeexpressedbythereciprocaloffilm.ofthicknessunit.Cm.—Toexp

6、resspigmentdensitybyusingratioofthequantityofpigmenttobinder.3.3Relativetintingstrength:theratioofsample’sabsorptionindextostandardsample’sabsorptionindex,expressedbypercentage.41.1Scatteringpower:Thepowerofpigmenttoscattertheincomelight,soafteraddingsuchpigment,th

7、ecolorpainthastheabilityofopaqueandlight.1.2ScatteringIndex：thespectralscatteringfactor÷pigmentdensityCm(3.2).Where:--Spectralscatteringindex,theamountofwhitepigment’sscattering,theunittobeexpressedbythereciprocaloffilmthicknessunit.1.3Relativescatteringpower:thera

8、tioofsample’sscatteringindextostandardsample’sscatteringindex,expressedbypercentage.1.4Reflectionfactor:meanscolorpasteandpigmentfilminthegivenso