The coloring process of color matching, the colorant of color matching

Color matching and coloring can be done by adding toner directly to the resin method and masterbatch method.

After the toner is directly mixed with the plastic resin, it is sent to the next step of the product molding process, the process is short, the cost is low, but the working environment is poor, the tinting strength is poor, the coloring uniformity and quality stability are poor.

The masterbatch method is a granule of colorant and carrier resin, dispersant and other additives prepared into a certain concentration of colorant, and a certain amount of masterbatch is added according to the coloring requirements when the product is formed, so that the product contains the required coloring dose to meet the coloring requirements.

Masterbatches can be classified according to the resin to be colored, such as ABS masterbatch, PC masterbatch, PP masterbatch, etc.; It can also be classified according to the coloring resin processing process, and there are three types of masterbatches: injection molding, blown film, and extrusion grade. Due to the pretreatment of pigments, the masterbatch has high tinting strength, the dosage can be reduced and the quality is stable, and the transportation, storage, use is convenient, and the environmental pollution is greatly reduced.

The dispersant excludes the surface air through the wetting and penetration of the pigment, disperses the agglomerate and agglomerate into fine, stable and uniform particles, and no longer coagulates in the processing process, the commonly used dispersant is low molecular weight polyethylene wax, EVA wax or oxidized polyethylene wax is used for organic pigments and carbon black that are difficult to disperse, and the synthesis of low molecular weight polyethylene wax and low molecular weight polyethylene wax prepared by polyethylene cracking method is very different. Other additives include coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, etc., depending on the requirements and varieties of the dosage, called multi-functional masterbatch, and then add brightener, which is conducive to the release of molded products and improve the surface brightness of products.

The performance indicators of masterbatch include color difference, whiteness, yellowness, yellowness, thermal stability, oxygen index, melt flow rate, etc., of course, the fineness, mobility, chemical resistance, and toxicity of pigments are also related to the performance of masterbatch, and some indicators are very important in special uses, such as the fineness of the filter value (DF value) of fiber grade masterbatch.

This regular masterbatch company will give a process configuration table.

There are two main types of colorants: pigments and dyes. Pigments are colorants that cannot be dissolved in ordinary solvents, so in order to obtain the desired coloring properties, it is necessary to uniformly disperse the pigments in the plastic by mechanical methods. According to the structure, it can be divided into organic pigments and inorganic pigments.

The thermal stability and light stability of inorganic pigments are excellent, low in **, but the tinting strength is relatively poor, and the relative density is large; Organic pigments have high tinting strength, bright color, complete chromatogram and small relative density, and the disadvantages are that they are inferior to inorganic pigments in terms of heat resistance, weather resistance and hiding power. Dye is an organic compound that can be used in most solvents and dyed plastics, with the advantages of low density, high tinting strength and good transparency, but its general molecular structure is small, and it is easy to migrate when colored.

There are three main types of white pigments: titanium dioxide, zinc oxide, and zinc-barium white. Titanium dioxide is divided into two structures: rutile type and anatase type, and the rutile type titanium dioxide has high refractive index, high hiding power, stability and good weather resistance.

Carbon black is a commonly used black pigment, cheap, in addition to the plastic ultraviolet protection (anti-aging) effect and conductive effect, different production processes can obtain a wide range of different carbon black, the properties are also very different. Carbon black is divided into pigmented carbon black and rubber reinforcing carbon black according to its use, and pigmented carbon black is divided into high-pigment carbon black, medium-pigmented carbon black and low-pigment carbon black according to its coloring ability. Carbon black particles are prone to aggregation, so it is necessary to improve the tinting strength of carbon black and solve the dispersion of carbon black.

Pearlescent pigment, also known as mica titanium pearlescent pigment, is a kind of titanium dioxide-coated mica wafer. According to the different hues, it can be divided into three categories: silver-white pearlescent pigments, rainbow pearlescent pigments, and color pearlescent pigments.

To buy pigments, you must understand the dye index of pigments (, which is an international compilation of dyes and pigment varieties jointly compiled and published by the British Association of Colorists and the American Society of Textile Chemists and Colorists, each pigment has two numbers according to the application and chemical structure category, so as to avoid misunderstandings about the pigments with the same molecular structure and different names when purchasing, and it is also conducive to the management and finding the reasons when using.