1. Colorants for PVC

PVC is an important general thermoplastic material with a wide range of uses, including commonly used low-end and high-end fields with special performance requirements such as building materials, automobiles, doors and windows, etc. Due to its low processing and molding temperature, various types of organic pigments can be used for coloring, but the colorant should still be selected specifically according to the processing conditions and the final use of the colored product. Of course, it is necessary to avoid the phenomenon of frosting when coloring PVC.

The frosting phenomenon during PVC coloring can be considered to be caused by the partial dissolution of the organic pigment as a colorant at the processing temperature and the recrystallization of the pigment at room temperature. This phenomenon also exists in other polyolefin plastics, especially for soft PVC materials. The added plasticizer increases the solubility of the colorant in it, making it easier to produce frosting, and as the processing temperature increases, the frosting phenomenon becomes more serious; in addition, due to the less than ideal compatibility between the pigment and PVC, especially when it contains certain additives, this will cause the pigment to The oversaturation of the pigment causes surface precipitation. Therefore, different grades of organic pigments can be selected according to different requirements for the coloring of PVC:

① General colorant, with good economy but average durability (yellow, orange and red)

Varieties include C.I. Pigment Yellow 61. C.I. Pigment Yellow 168. C.I. Pigment Orange 13. C.I. Pigment Orange 34. C.I. Pigment Red 48:1. C.I. Pigment Red 48:2. C.I. Pigment Red 48:3. C.I. Pigment Red 57:1. C.I. Pigment Red 57:2.

② Colorants with excellent performance (yellow, orange and red)

Varieties include C.I. Pigment Yellow 139. C.I. Pigment Yellow 183. C.I. Pigment Yellow 191. C.I. Pigment Orange 43. Graphtol Fast Orange 5GL, C.I. Pigment Red 151. C.I. Pigment Red 214. C.I. Pigment Red 242.

③Colorants suitable for outdoor colored products

Varieties include C.I. Pigment Yellow 24. C.I. Pigment Yellow 110. C.I. Pigment Brown 23. C.I. Pigment Brown 25. C.I. Pigment Red 122. C.I. Pigment Blue 15. C.I. Pigment Blue 60. C.I. Pigment Green 7. C.I. Pigment Violet 23.

2. Colorants for PA

Colorants for PA can be organic pigments or dyes soluble in polymers. Organic pigments used for PA coloring can be divided into two grades:

① Organic pigments with general application performance include:

C.I. Pigment Yellow 148. C.I. Pigment Yellow 150. C.I. Pigment Yellow 187. C.I. Pigment Red 149. C.I. Pigment Red 177. C.I. Pigment Violet 23.

② Organic pigments with excellent performance include:

C.I. Pigment Yellow 192. C.I. Pigment Orange 68. C.I. Pigment Blue 15:3. C.I. Pigment Green 7. Among them, C.I. Pigment Yellow 192 is a bright red-yellow heterocyclic pigment without metal. It still has high heat stability (300℃) and excellent weather fastness at low concentrations, and can be used with inorganic pigments such as titanium dioxide and zinc sulfide; C.I. Pigment Orange 68 is a bright red-orange nickel complex pigment containing a benzimidazolone group, which has excellent light and heat resistance.

3. Colorants for polyester materials

Polyester materials (including PET and PBT) can be colored with pigments, such as C.I. Pigment Yellow 138. C.I. Pigment Yellow 147. C.I. Pigment Red 214. C.I. Pigment Red 242. etc., but more often they are colored with polymer-soluble solvent dyes, such as Estofil S (Clar), Polysynthren (Hö), Filester (Ciba), etc.

4. Colorants for ABS

ABS is mostly colored with polymer-soluble solvent dyes, which not only have good transparency, but also good light fastness. If used with inorganic pigments, opaque colored products can be obtained. Commonly used polymer-soluble solvent dyes include C.I. Solvent Yellow 93. C.I. Solvent Orange 60. C.I. Solvent Red 111. C.I. Solvent Red 135. C.I. Solvent Blue 104. C.I. Solvent Green 3. etc.

5. Colorants for PS, SAN (styrene-acrylonitrile copolymer), PMMA, PC and CAB (cellulose ester)

These thermoplastics have excellent transparency. In order to keep the original transparency of the colored products, in addition to the above-mentioned pigments, it is more appropriate to use solvent dyes and disperse dyes with high solubility, so that they can dissolve in the plastic during the coloring process to form a stable molecular solution and show high coloring strength. The varieties include Yellow 6G, Yellow G, Yellow R, Orange GG, Red GS, Red 5B, Red 7B, Violet R, Violet 3R, Violet B, Green 5B. Their dosage is 0.025% to 0.05%, and the heat resistance can reach 280 to 300℃.