Color matching can be directly added to the resin method and masterbatch method using a toner.
The toner is directly mixed with the plastic resin, and then sent to the next product molding process, the process is short, the cost is low, but the working environment is poor, the coloring power is poor, the coloring uniformity and the quality stability are poor.
The masterbatch method is a pellet of a coloring agent and a carrier resin, a dispersing agent and other auxiliary agents, and is formulated into a certain concentration of a coloring agent. When the product is formed, a certain amount of color masterbatch is added according to the coloring requirement, so that the product contains the required coloring amount, and the product is obtained. Coloring requirements.
The 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 coloring resin and process, and there are three kinds of masterbatch of injection molding, blown film and extrusion grade. . The color masterbatch has a higher coloring power due to the pretreatment of the pigment, the dosage can be reduced and the quality is stable, and transportation, storage, use and convenience, and environmental pollution are greatly reduced.
The dispersing agent removes the surface air by wetting and infiltrating the pigment, disperses the agglomerates and agglomerates into fine, stable and uniform particles, and does not agglomerate during the processing. The commonly used dispersing agent is a low molecular weight polyethylene wax. For the more difficult to disperse organic pigments and carbon black, EVa wax or oxidized polyethylene wax is used, and the synthesis of low molecular weight polyethylene wax and polyethylene cracking low molecular weight polyethylene wax are very different. Other additives include coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, etc., depending on the requirements and variety, called multi-functional masterbatch, and if added brightener, it is beneficial to molded products. Demolding and improving the surface brightness of the product.
The performance indicators of masterbatch include color difference, whiteness, yellowness, yellowing degree, thermal stability, oxygen index, melt flow rate, etc. Of course, pigment fineness, migration, chemical resistance, toxicity and color masterbatch Particle performance is related, and some indicators are important in special applications, such as the filter size (DF value) fineness of the fiber grade masterbatch.
The hardware for color management has a colorimeter and a computer that processes the measured data. The colorimeter can be divided into two types, a spectrophotometer and a color difference meter, instead of measuring the color of the human eye, and removing the influence of human factors on the measurement result.
The spectrophotometer is used to measure the reflection coefficient of each wavelength to the completely diffuse reflection surface, and the chromaticity value or chromatic aberration cannot be directly obtained, but the chromaticity value and other various values ​​can be evaluated by the data processing. Spectrophotometers can be classified into two types: diffraction grating diffraction and interference filter splitting. The advanced spectrophotometer with built-in microprocessor has 0%, 100% auto-correction and multiplier increase, which improves accuracy.
The color difference meter is a simple test instrument, which is to produce a filter with the same spectral sensitivity as the human eye. It is used to measure the light of the sample. The key is to design a photometric sensitivity characteristic of the photoreceptor. Filter for measuring color difference under a certain light source. The color difference meter is small in size and easy to operate. It is suitable for batch management of the same product with small change in spectral characteristics. The color difference meter with small microcomputer is easy to use with standard template. Correct and output multiple color difference values.
The color management software has a spectral reversal rate curve, a color difference formula, a conditional color representation, an opacity representation, and a haze representation. The spectral reflectance curve is used for analysis when selecting a colorant and cannot be used to determine the color uniformity. Color difference is one of the most important indicators in color management, but the color difference obtained by different color difference formulas is different, so the chromaticity system or color difference formula must be indicated.
The use of computers for color formulation and its management has been successfully used in plastic color matching.
The computer color meter has the following features:
(1) Color matching
Establish a common database of pigments (dye) according to requirements (prepare the basic swatch and input). Then enter the incoming swatch into the computer under the software menu, click on a number of candidate pigments in the keyboard, and immediately calculate a series of recipes, and sort them by color difference and price respectively for color matching;
(2) Recipe correction
Correct the computer to list the formula and other source formulas. When the color difference is unqualified, use the inconsistent reflection curve displayed by the display to directly increase or decrease the amount of pigment through the keyboard until the two curves are basically coincident, and the corrected formula is obtained;
(3) Color measurement and color difference control
The coloring strength of the colorant, the whiteness of the product, the color fastness of the product, and the color chromatic aberration were measured. Because the computer can quantitatively express the performance indicators of color, it is beneficial to the communication and transmission of information between the two parties;
(4) Color management
Color samples, recipes, process conditions, production dates and users in daily work can be stored in the computer for easy retrieval, searching and reference as a modification. It is convenient and fast, improves work efficiency and is easy to keep confidential.
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