First, the principle of plastic coloring technology
Plastic coloring technology is to add pigments or dyes to plastics to achieve the desired color effect. There are two kinds of plastic coloring techniques: one is to add pigments or dyes before plastic processing, and the other is to cover the plastic surface with colors by spraying, printing and thermal transfer after plastic processing.
1. Coloring of plastics before processing
Coloring before plastic processing refers to mixing pigments or dyes with plastic raw materials before plastic products are processed into required plastic products. The advantage of this coloring method is that the color is uniform and firm and it is not easy to fade. Commonly used coloring methods are as follows:
(1) dry coloring: pigment or dye is mixed with plastic raw materials and processed by internal mixer, extruder, injection molding machine and other equipment to make the required plastic products.
(2) Wet coloring: after mixing pigments or dyes with dissolved plastic raw materials, the required plastic products are made by solution rotation, spray drying, etc.
2. Color the plastic after processing.
Coloring after plastic processing refers to covering the plastic surface with color by spraying, printing and thermal transfer after plastic products are processed. The advantages of this coloring method are flexibility and convenience, and easy to change color. Commonly used coloring methods are as follows:
(1) spray coloring: spray the color on the surface of plastic products, and make it adhere to the plastic surface through drying, curing and other processes.
(2) Printing and coloring: printing colors on the surface of plastic products and attaching them to the plastic surface through processes such as drying and curing.
(3) Thermal transfer coloring: printing the color on the thermal transfer film, and transferring the color to the surface of the plastic product through processes such as heating and pressing.
Second, the application of plastic coloring technology
Plastic coloring technology is widely used in various fields, such as home appliances, automobiles, buildings, toys and so on. The following are several typical application cases:
1. field of household appliances
Most household appliances use plastic materials, so plastic coloring technology is widely used in the field of household appliances. Such as TV sets, washing machine panels, air conditioning panels, etc. All need to be colored to increase the aesthetics and market competitiveness of the products.
2. Automotive field
Plastic products in automobile products also need to be colored to increase the beauty and quality of automobiles. Such as automobile dashboard, door trim, seats, etc. All need to be colored.
3. The field of architecture
Plastic products in the building field also need coloring to increase the beauty and quality of the building. For example, plastic window frames, plastic doors and plastic water pipes all need to be colored.
4. Toy yard
Plastic products in toy products also need to be colored to increase the attractiveness and market competitiveness of toys. For example, plastic building blocks, plastic toy cars and plastic dolls all need to be colored.
Third, how to color the plastic without falling off?
After plastic is colored, how to ensure that the color will not fall off? The following are several ways to ensure that plastic coloring does not fall off:
1. Select high-quality pigments or dyes.
Choosing high-quality pigments or dyes is the key to ensure that plastic coloring will not fall off. High-quality pigments or dyes have good adhesion and durability, and can keep the color of plastic products unchanged for a long time.
2. Control the coloring temperature and humidity
When coloring plastics before processing, it is necessary to control the coloring temperature and humidity. Excessive temperature and humidity will affect the adhesion and durability of pigments or dyes, resulting in the easy shedding of plastics after coloring.
3. Choose a suitable coloring method
Choosing an appropriate coloring method is also the key to ensure that the plastic coloring will not fall off. Different coloring methods have different applicability to different plastic products. Such as soft plastic products, spray coloring may lead to fading, while printing coloring may be more suitable.
To sum up, plastic coloring technology is an important technology, which can add color to plastic products and improve their aesthetics and market competitiveness. When plastic is colored, it is necessary to choose high-quality pigments or dyes, control the coloring temperature and humidity, and choose appropriate coloring methods to ensure that plastic coloring does not fall off.