In the previous article, we have learned and compared two colorants. Next, let's continue to look at the comparison of the following two colorants.

Color Paste Coloring

Color paste is a semi-finished product made by dispersing pigments and fillers in paint. According to the purpose, it can be divided into paint paste, tape paste, papermaking paste, textile paste, mechanical paste, toy paste, latex product paste, etc.

Advantages

1. Easy to use, can be directly put into the processing technology for molding and plate coloring;

2. Generally, it has good high temperature resistance, convenient storage, and no precipitation;

3. It can reduce the dust pollution problem in the use of color powder, and can also solve the shortcomings of masterbatch in compatibility and dispersibility;

4. The amount of color paste used is easy to control during use, reduce color difference, and improve color strength and color brightness;

5. Environmentally friendly and in line with EU REACH and other regulations.

Disadvantages

1. At present, the biggest constraint on the development of color paste is the production process of domestic color paste. High-quality color paste has higher requirements for process and raw material quality, and its cost will be higher than masterbatch and color powder;

2. When the amount added is large, the screw may slip;

3. When stored for a long time, precipitation will occur, and it is better to stir before use.

Color Oil Coloring

Color oil is a liquid pigment concentrate without resin carrier. At present, color oil is mainly used on bottle embryos in my country.

Advantages

1. Low addition ratio, usually 0.1-0.5% for transparent series and 0.3-3.0% for pearlescent/solid color series;

2. Excellent dispersibility, more uniform color, more colorful color, and higher gloss of the product; stable color and reduced coloring defects;

3. The material only undergoes a high temperature process once to keep the physical properties of the raw resin unaffected;

4. Optimal inventory management, only a small space is needed to complete the storage of color oil. Compared with masterbatch, it saves three-quarters of storage space. Reduce the pressure of overall inventory and working capital;

5. The color oil adding equipment is simple, low cost, the color changing process is simple and fast, which improves the freedom of production scheduling and saves man-hours, machines and energy loss;

6. Applicable to all polyolefins (such as PP/PE), polystyrene resin (PS), PET resin and other engineering resins.

Disadvantages

1. Antistatic agent cannot be added to the color oil, resulting in the product not being dustproof on the shelf or in storage;

2. The shelf life of color oil products is shorter than that of masterbatch products;

3. Color oil requires special color oil adding equipment, that is, color oil metering pump to supply color oil to the injection molding machine to produce the desired color product.
 

The above is the performance comparison of 4 commonly used plastic colorants. You can choose according to your needs!