First, coloring coloring _ definition:
The color matching is based on the three basic colors of red, yellow and blue, and it is matched with the colors that are desirable, meet the color difference requirements of the color cards, and are economical and do not change color during processing and use. In addition plastic coloring can also give a variety of plastic functions, such as improving the plastic light resistance and weather resistance; to give some of the plastic special features, such as conductivity, antistatic properties; different colors of agricultural plastic film with weeding or prevention, breeding and other effects. That is, color matching can achieve certain application requirements.
Second, coloring agent:
Coloring agents are mainly divided into two kinds of pigments and dyes. Pigments are colorants that are insoluble in common solvents. Therefore, to obtain the desired coloring properties, it is necessary to mechanically disperse the pigments uniformly in the plastic. According to the structure can be divided into organic pigments and inorganic pigments. Inorganic pigments are excellent in thermal stability and light stability, low in price, but relatively poor in coloring power and relatively high in density; organic pigments have high coloring power, bright color, complete chromatogram, and low relative density, with disadvantages of heat resistance, weather resistance and hiding. The strength is not as good as inorganic pigments. Dyes are organic compounds that can be used in most solvents and dyed plastics. They have the advantages of low density, high coloring power, and good transparency. However, their general molecular structure is small, and they tend to migrate when they are colored.
The main white pigments are titanium dioxide, zinc oxide, and zinc antimony white. Titanium dioxide is divided into rutile type and anatase type. Rutile titanium dioxide has a high refractive index, high hiding power, stability, and good weather resistance.
Carbon black is a commonly used black pigment, which is cheap and has ultraviolet protection (anti-aging) and conductive effect on plastics. Different production processes can obtain various carbon blacks with a wide range of particle sizes, and the properties vary greatly. Carbon black is divided into pigmented carbon black and rubber-reinforcing carbon black depending on the purpose. Pigmented carbon black is classified into high-pigmented carbon black, medium-pigmented carbon black, and low-pigmented carbon black according to its coloring ability. The carbon black particles are prone to aggregation, and the coloring power of the carbon black needs to be improved, and the dispersibility of the carbon black must be solved.
Pearlescent pigment, also known as mica titanium pearlescent pigment, is a titanium dioxide coated mica wafer. According to the different hue, it can be divided into silver-white pearlescent pigments, rainbow pearlescent pigments, colored pearlescent pigments.
To purchase pigments, it is necessary to understand the dye index (CI) of pigments. CI is a compilation of international dyes and pigments published by the British Dyers Association and the American Society of Textile Chemists and Colourists. Each pigment is applied according to its application and chemical structure. There are two numbers in the category to avoid misunderstanding of the same molecular structure and different colors when purchasing, and it is also helpful to manage and find out the reasons for use.
Third, coloring coloring process:
Coloring coloring can be directly added to the resin and the masterbatch method.
After the toner and the plastic resin are directly mixed, they are sent to the next product forming process. The process is short and the cost is low, but the working environment is poor, the coloring power is poor, and the coloring uniformity and quality stability are poor.
Masterbatch method is a colorant and carrier resin, dispersant, and other additives formulated into a certain concentration of colorant pellets, the product according to the coloring requirements when molding, adding a certain amount of masterbatch, so that the product contains the required colorant dose, to achieve Coloring requirements.
Masterbatch 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 process of colored resin and additive; there are three types of masterbatch: injection molding, blown film and extrusion grade. . The masterbatch has higher coloring power because of the pretreatment of the pigment, the amount can be reduced and the quality is stable, and the transportation, storage, use is convenient, and the environmental pollution is greatly reduced.
The dispersant removes the surface air by wetting and penetrating the pigment, disperses the agglomerates and agglomerates into fine, stable and uniform particles, and no longer coagulates during the processing. The commonly used dispersant is a low molecular weight polyethylene wax. For the more difficult to disperse organic pigments and carbon black using EVA wax or oxidized polyethylene wax, the synthesis of low molecular weight polyethylene wax and polyethylene cracking method of low molecular weight polyethylene wax is very different. Other auxiliaries include coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, etc. Depending on the requirements and the variety of additives, it is called multi-functional masterbatch. If brighteners are added, it is beneficial to molded products. Demoulding and improve the surface brightness of products.
Color masterbatch performance indicators are color, whiteness, yellowness, yellowing, thermal stability, oxygen index, melt flow rate, of course, pigment fineness, mobility, chemical resistance, and the nature of ※ Masterbatch performance, some indicators are very important in special applications, such as the fiber filter value (DF value) fineness.
Fourth, the color management and instrument color management hardware has a colorimeter and a computer that processes the measured data. Colorimeter can be divided into spectrophotometer and colorimeter two kinds, instead of the human eye to determine the color, remove the influence of human factors on the measurement results.
The spectrophotometer is used to measure the reflection coefficient of a completely diffuse reflective surface at each wavelength, and the chroma value or color difference cannot be obtained directly, but the color value and other various values ​​can be evaluated by processing the data. Spectrophotometers can be divided into two types: diffraction gratings and interference filters. The advanced spectrophotometer with built-in microprocessor has 0%, 100% auto-calibration and magnification increase, which improves the accuracy.
Colorimeter is a kind of simple test instrument, that is to make a filter with spectral characteristics equal to the sensitivity of human eye sense. Using it to measure the light of the template, the key is to design a kind of sensor that has the sensitivity of photoreceptor and can The filter for measuring the color difference value under a certain light source has a small size and is easy to operate. It is suitable for the batch management of the same product with small change in the spectral characteristics. The color difference meter with a small microcomputer is easy to use with a standard model. Correct and output multiple color difference values.
The color matching management software has the spectral refraction rate curve, the color difference formula, the conditional color representation, the hiding power representation, and the haze representation. The spectral reflectance curve is used for the analysis when selecting the colorant and cannot be used to determine the color consistency. Color difference is one of the most important indicators in color management, but different color difference formulas have different chromatic aberrations
Print Hacci Hoodie,Half-Neck Hacci Hoodie,Zipper Hoodies,Casual Sports Hacci Hoodie
SHAOXING CHENYEE TEXTILE CO. LTD , https://www.fabriccy.com