What is the standard for testing the migration performance of toners?

Chenmei pigment masterbatch specializes in the production and wholesale of toners, masterbatches, phosphors and other pigments. Chenmei pigments are widely used in plastics, silicone, inks, coatings and other fields. 138/28799/141。Here's what Morning Beauty Paint is:

Migration performance ( migration).

Migration in plastic colorants refers to the migration of colorants from the inside of plastics into plastics and solvents. Test standard: EN14469-3 Test equipment and raw materials are the same as above.

Test method The colorant content is controlled at 160 degrees, and the thickness of the PVC flakes is 3 minutes. Then the sheet was placed in a flat tablet press at a temperature of 165 170 degrees and pressed for 1 piece for 1 hour, and then cooled under pressure, and the white sheet with a titanium dioxide content of 5% was made under the same conditions, and the sample piece was placed in the middle of the two white sheets tightly fitted, and the pressure of 1kg cm2 was applied, and it was put into an oven at 80 degrees for 24 hours to take out, and the degree of contamination on the two white sheets was observed, and the migration performance was evaluated with a standard gray card, from grade 1 to grade 5.

Migration Resistance Migration resistance. There are three main types of colorant migration, 1) solvent extraction, i.e., bleeding in water and organic solvents; 2) contact migration, causing contamination of adjacent objects; 3) Surface frosting, mainly due to the gradual crystallization and precipitation of the colorant due to the large solubility in the polymer during thermal processing, and the small solubility at room temperature. Inorganic pigments are generally heterogeneous in polymer dispersion and do not produce frosting, while organic pigments have different degrees of solubility with other organic substances in polymers and are more prone to migration.

The ease with which organic pigments migrate depends heavily on the type of polymer and other additives, especially plasticizers and softeners. Experiments show that, in general, the mobility of inorganic salts of organic acids is relatively small. Higher molecular weights are less mobile than those with lower molecular weights.

Professional and technical problems can be directly understood by the technical department of Shenzhen Chenmei pigment masterbatch manufacturer.

Lightfastness refers to the ability of a colorant to maintain its color for a specific period of time when exposed to sunlight, according to the lightfastness test standard DIN53387 ISO R879

Test Method: 1.PVC sheets with colorant content were irradiated with the specified Xenon cannon for 1000 hours and lightfastness was assessed using the Blue Wool Scale (standard blue wool scale) in grades 1 to 8.

2.PVC sheets with colorant content are aged in a specified artificial accelerated aging chamber for 1200 hours, and the lightfastness is assessed by ISO Gray Scale (standard gray mark), grade 1 to 5.

Lightfastness: Generally speaking, the photostability of inorganic pigments is relatively good, and among the organic colorants, organic pigments such as phthalocyanine, quinacridone, dioxazine, and isoindolinone have excellent lightfastness, which can be compared with inorganic pigments; Dyes such as anthraquinone and pyranthone also have good lightfastness. Chemical resistance: Chemical resistance, acid resistance, alkali resistance, etc.

Method:1PVC tablets with colorant content were immersed in 5% HCl or 10% NaOH for 1 hour to observe the degree of surface contamination.

2.The PVC sheet with colorant content was placed on the H2S generator dish, the test piece was covered with flat glass, and the surface contamination was observed after 15 minutes.