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What is The Plastic Color Matching?
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2021-08-31 | 2882 Views | Share:
Plastic color matching is based on the three basic colors of red, yellow, and blue (three primary colors), to match the color that is pleasing, meets the color difference requirements of the color card, meets the color that the customer wants, is economical, and does not change color during processing and use.

What is The Plastic Color Matching?

Definition of plastic color matching

Plastic color matching is based on the three basic colors of red, yellow, and blue (three primary colors), to match the color that is pleasing, meets the color difference requirements of the color card, meets the color that the customer wants, is economical, and does not change color during processing and use.

In addition, plastic coloring can also give plastics many functions, such as improving plastic light resistance and weather resistance; giving plastics some special functions, such as electrical conductivity, antistatic properties, antibacterial properties, and other special materials; different colored agricultural mulches have weeding or insect repelling, Nursery seedlings and other functions. That is, through color matching and coloring, certain application requirements can be met.

Colorant of plastic color matching

Pigment characteristics: Pigments are colorants that cannot be dissolved in common solvents. Therefore, to obtain ideal coloring properties, it is necessary to uniformly disperse the pigments in the plastic by methods such as mechanical heating and kneading.

Pigment classification: According to the structure of pigments, they can be divided into organic pigments and inorganic pigments.

Inorganic pigments:

Advantages: good thermal stability, very good weather resistance, excellent light stability, low price, superior dispersion performance. For example titanium dioxide, carbon black, etc.

Titanium dioxide series: mainly include titanium dioxide, zinc oxide, and lithopone. Titanium dioxide has two structures: rutile and anatase. Rutile titanium dioxide has a high refractive index, high hiding power, stability, and good weather resistance.

If titanium dioxide is not dispersed when it leaves the factory, a large number of black spots will be produced during the color matching process. It is in the state of dispersing that is not open, so it can be used after dispersing processing with a dispersant . Some manufacturers' brands are processed after processing. When entering the market, such materials can be used directly. It is mainly used to cover the transmittance of resin and increase the whiteness.

Carbon black: It is a commonly used black pigment, which is cheap. In addition, it has UV protection (anti-aging) and conductive effects on plastics. Different production processes can obtain various carbon blacks with a wide range of particle sizes, and their properties are also very different.

Carbon black is classified into pigment carbon black and rubber reinforcement carbon black according to its purpose. Pigment carbon black is further divided into high pigment carbon black, medium pigment carbon black, and low pigment carbon black according to its coloring ability. Carbon black particles are prone to agglomeration. To improve the coloring power of carbon black and solve the dispersibility of carbon black, it is necessary to add a dispersant for processing before it can be used.

Disadvantages: relatively poor coloring power, high relative density, a large amount of addition, and the color is not bright;

Mainly used: to increase the color density (generally all kinds of resins are available according to the color needs), especially for engineering plastics with good superior performance, such as PA, PC, PBT, POM, PPO, PPS, etc. Among materials , non-transparent colors, gray and other resins.

Organic pigments:

Advantages: high tinting strength, bright color, complete chromatogram, low relative density, small additional amount.

Disadvantages: Inferior to inorganic pigments in terms of heat resistance, weather resistance and hiding power, poor dispersion effect, poor transparency relative to dyes, and higher prices.

Mainly used in POM, PE, PP, TPU, TPE, and other crystalline materials and some bright (bright color products that cannot be achieved by dyes) products.

Dye:

Advantages: Dyes are organic compounds that can be used in most solvents and dyed plastics. The advantages are low density, high coloring power, and good transparency.

Disadvantages: But its general molecular structure is small, and it is easy to migrate during coloring (crystalline material). The price is more expensive than inorganic, and the price of some is close to that of organic pigments.

Pearlescent Pigment: Also called Mica Titanium Pearlescent Pigment, it is a kind of mica wafer coated with titanium dioxide. According to different hues, it can be divided into three types: silver-white pearlescent pigments, rainbow pearlescent pigments, and colored pearlescent pigments.

Notes:

When buying pigments, you must understand the dye index (CI) of the pigment. CI is an international collection of dyes and pigments compiled and published by the British Dyers Association and the American Textile Chemists and Dyers Association. Each type of pigment is based on application and chemistry. The structure category has two numbers to avoid misunderstanding of the same molecular structure and different names when purchasing, and it is also conducive to color management and the use of correct pigments to find the cause when problems occur.

Plastic color matching process

Plastic color matching and coloring can adopt the method of adding the toner directly to the resin, the extrusion method of the toner mixed resin and the masterbatch method.

Toner is directly added to the resin method: After the toner is directly mixed with the plastic resin, it is sent to the next product molding process. The process is short and the cost is low, but the working environment is poor, the coloring power is poor, and the color uniformity and quality stability are poor.

Toner mixed resin extrusion method: This method has the best effect on the uniformity of resin and color, and can fully disperse the pigment in the resin, the color is accurate, the quality is clean, and it is easy to process.

Masterbatch method:

It is the colorant, carrier resin, dispersant, and other auxiliary agents to formulate a certain concentration of colorant pellets. When the product is formed, a certain amount of masterbatch is added according to the coloring requirements to make the product contain the required amount of coloring to meet the coloring requirements.

Color 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 addition process, and there are three types of masterbatches for injection molding, film blowing, and extrusion. The color masterbatch has high tinting strength due to the pretreatment of the pigment first, the dosage can be reduced, the quality is stable, the transportation, storage, and use are convenient, and the environmental pollution is greatly reduced.

The dispersant removes the surface air by wetting and penetrating the pigment, disperses the aggregates and agglomerates into fine, stable, and uniform particles, and no longer aggregates during processing. The commonly used dispersant is a low molecular weight polyethylene wax. For organic pigments and carbon black that are difficult to disperse, EVA wax or oxidized polyethylene wax is used. There is a big difference between synthetic low-molecular-weight polyethylene wax and low-molecular-weight polyethylene wax made by polyethylene cracking.

Other auxiliaries include coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, etc., depending on the requirements and varieties, called multi-functional masterbatch, and if the brightener is added, it is beneficial to molded products. Demould and improve the surface brightness of the product.

The performance indicators of the color masterbatch include color difference, whiteness, yellowness, yellowness, thermal stability, oxygen index, melt flow rate, etc. Of course, the fineness, migration, chemical resistance, and toxicity of the pigment are also related to the color masterbatch. Particle performance is related, and some indicators are very important for special purposes, such as the fineness of the filter pressure value (DF value) of the fiber-grade masterbatch.

Plastic color matching management and instruments

The hardware for color matching management includes a color meter and a computer for processing the measured data. Colorimeters can be divided into two types: spectrophotometer and colorimeter, which can replace the human eye to measure color and remove the influence of human factors on the measurement results.

The spectrophotometer is used to measure the reflection coefficient of each wavelength to the completely diffuse reflection surface. The chromaticity value of chromatic aberration cannot be obtained directly, but the chromaticity value and various other values can be evaluated through data processing.

Spectrophotometers can be divided into two types: diffraction gratings and interference filters. The advanced spectrophotometer with a built-in microprocessor has the functions of 0%, 100% automatic correction, and magnification increase, thereby improving the accuracy.

The color difference meter is a simple test instrument, that is, to make a filter with spectral characteristics equal to the color sensitivity of the human eye, and use it to measure the light of the sample. The key is to design a photoreceptor with spectral sensitivity characteristics and can The filter for measuring the color difference value under a certain light source. The color difference meter is small in size and easy to operate. It is more suitable for batch management of the same product with small changes in spectroscopic characteristics. The color difference meter with a small microcomputer is easy to use a standard template. Correct and output multiple color difference values.

Plastic color matching management software has spectroscopic inversion rate curve, color difference formula, conditional color representation, hiding power representation, and haze representation. The spectral reflectance curve is used for analysis when selecting colorants, and cannot be used to judge the consistency of colors. The color difference value 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 used must be indicated.

The computer color matching instrument has the following functions:

(1) Color matching: Establish a database of commonly used colors (dyeing) materials according to requirements (preparation and input of basic color palettes). Then enter the incoming color palette into the computer under the software menu, click on a number of candidate pigments in the keyboard, and immediately calculate a series of formulas, and list them in order of color difference and price for color matching;

(2) Formula correction The computer lists formulas and formulas from other sources. When the color difference is unqualified, the inconsistent reflection curve displayed on the display is used to directly increase or decrease the amount of pigment through the keyboard until the two curves basically coincide , and the revised formula is obtained;

(3) Color measurement and color difference control measure the color strength of the colorant, the whiteness of the product, the color fastness of the product, and the color difference. Since the computer can quantitatively express the color performance index, it is conducive to the communication and transmission of information between the two parties;

(4) Color sample, formula, process conditions, production date, and user information in the daily work of color management can be stored in the computer, which is convenient for retrieval, search and reference when modifying. It is convenient and fast, improves work efficiency, and is convenient Keep it secret.

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