Application and characteristics of special color masterbatch for plastic: This series of products are special masterbatch (aBS. PS. HIPS. PP. PE, etc.), which has excellent compatibility, dispersibility and color stability, and maintains the highest Mechanical strength, mainly used for coloring industrial plastic products such as household appliances and automobiles. Food grade masterbatch application and characteristics: This series of products (PE. PS. PP, etc.) its carrier, pigments and additives have been strictly screened in many years of experiments and production, and in line with China. US and European food hygiene requirements. Mainly used for coloring plastic products for food packaging and plastic drinking water pipes. Application and characteristics of film grade PE and PP masterbatch: This series of products has high tinting strength and no color point. It is especially suitable for coloring of blown film, coating film, etc. for large-area printing. Application and characteristics of PE masterbatch for cable: The color of this series is in accordance with IEC-304 standard. It is produced by closed equipment and has good heat resistance, migration resistance, aging resistance and excellent electrical properties compared with general masterbatch. Mainly used for coloring of communication cable insulation.
Plastic color matching technology
Color matching principle
There are many types of colors, and different colors give people different feelings. Red, orange, and yellow give people warmth and joy, so they are called "warm colors"; blue, green, and purple are quiet and fresh, so they are called "cold colors."
Colors can be mixed with each other, mixing different original colors to produce different new colors. The mixing method is divided into the following two types:
- Addition of color shades - color mix
- Subtraction of color pigments - Mixing of color shades of mixed colors (subtractive blending)
Color and color mixing is generally applied to the three colors of red, yellow and blue. Red is the red wavelength that transmits, absorbs the green and the wavelengths of the rest of the color, and makes people feel red. The same is true for yellow and blue.
When yellow and blue are mixed, the yellow pigment absorbs the short wavelength band, the blue pigment absorbs the long wavelength band, and the middle green band passes through, which makes people feel green; similarly, the red and yellow mixture leaves longer than 560 nm. The band passes through and becomes orange. Red, blue mixed together, become purple.
The colors of red, yellow and blue are the primary colors. The colors of the two primary colors are called inter-color, which are orange, green and purple. The two colors are called complex colors, which are olive and blue. Gray, brown:
In addition, the primary or intermediate colors can be mixed with white and black to adjust the shades of different colors. Add white to the primary or inter-color to give light red, pink, light blue, lake blue and other colors; if you add different parts of black, you can match brown, dark brown, black and green and other colors.
First, color matching _ definition: color matching is based on the three basic colors of red, yellow and blue, with a color that is pleasing to the eye, meets the requirements of color difference of color, economy, and does not change color during processing and use. In addition, plastic coloring can also impart various functions to plastics, such as improving the light resistance and weather resistance of plastics; imparting certain special functions to plastics, such as electrical conductivity and antistatic property; different colored agricultural mulch films have the functions of weeding or avoiding insects and breeding. That is, color matching can also achieve an application requirement.
Second, the coloring agent: the coloring agent is mainly divided into two kinds of pigments and dyes. Pigments are colorants that are insoluble in common solvents, so to achieve the desired coloring properties, it is necessary to mechanically disperse the pigments uniformly in the plastic. According to the structure, it can be classified into organic pigments and inorganic pigments. Inorganic pigments have excellent thermal stability and light stability, low price, but relatively poor coloring power and high relative density; organic pigments have high tinting strength, bright color, complete chromatogram, and low relative density. The disadvantages are heat resistance, weather resistance and hiding. The force 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 tinting strength and good transparency, but their general molecular structure is small, and migration occurs easily during coloring.
White pigments mainly include titanium white powder, zinc oxide, and zinc white. Titanium dioxide is divided into two structures: rutile and anatase. Rutile titanium dioxide has high refractive index, high hiding power, stability, and good weather resistance.
Carbon black is a commonly used black pigment, which is cheap, and also has ultraviolet protection (anti-aging) effect and conductive effect on plastics. Different production processes can obtain various carbon blacks with a wide range of particle sizes, and the properties are also very different. Carbon black is divided into pigment carbon black and rubber reinforcing carbon black according to the use. The pigment carbon black is further classified into high pigment carbon black, medium pigment carbon black and low pigment carbon black according to its coloring ability. The carbon black particles are prone to aggregation, and the coloring power of the carbon black is increased to solve the dispersibility of the carbon black.
Pearlescent pigment, also known as mica titanium pearlescent pigment, is a titanium dioxide coated mica wafer. According to different hue, it can be divided into silver-based pearlescent pigments, rainbow-based pearlescent pigments, and 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 compiled by the British Dyers Association and the American Textile Chemists and the Dyers Association. Each pigment is applied and chemically structured. The category has two numbers to avoid misunderstanding of the same molecular structure and different pigments when purchasing, and it is also beneficial to manage and find the cause when using.
Third, the color matching process: color matching coloring can be directly added to the resin method and masterbatch method.
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.
Fourth, color management and instruments: 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.
Fifth, computer color matching: the use of computer for coloring formula and its management has been successfully used in plastic color matching.
The computer color meter has the following features:
(1) Color matching Create a common pigment (dye) database 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 correction The computer lists the formula and other source formulas. When the color difference is unqualified, the inconsistent reflection curve displayed by the display is used to increase or decrease the amount of pigment directly through the keyboard until the two curves are substantially 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 are 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 The color samples, recipes, process conditions, production date and user information in daily work can be stored in the computer, which is convenient for searching, searching and as a reference for modification. It is convenient and fast, and improves work efficiency and convenience. Confidential.
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