The full name of Color Master Batch is called color masterbatch, also called color seed, it is a new type of special colorant for polymer materials, also known as pigment preparation (Pigment Preparation). Color masterbatches are mainly used in plastics. The color masterbatch is composed of three basic elements: pigment or dye, carrier and additive. It is an aggregate made by uniformly loading super-normal pigments in the resin. It can be called pigment concentration (Pigment Concentration), so its Tinting power is higher than the pigment itself. When processing, a small amount of color masterbatch and uncolored resin is mixed to achieve the colored resin or product with the designed pigment concentration. If you want to know about مستربچ سفید, refer to this article
Basic Ingredient Editor Broadcast
pigment or dye
Pigments are divided into organic pigments and inorganic pigments
Commonly used organic pigments are: phthalocyanine red, phthalocyanine blue, phthalocyanine green, light fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent purple, azo red, etc. Commonly used inorganic pigments are: cadmium red , cadmium yellow, titanium dioxide, carbon black, iron oxide red, iron oxide yellow, etc.
2. Carrier
It is the matrix of masterbatch. The special color masterbatch generally chooses the same resin as the product resin as the carrier, and the compatibility between the two is the best, but at the same time, the fluidity of the carrier must also be considered.
3. Dispersant
To promote the uniform dispersion of pigments and no longer agglomeration, the melting point of the dispersant should be lower than that of the resin, have good compatibility with the resin, and have a better affinity with the pigment. The most commonly used dispersants are: polyethylene low molecular wax, stearate.
4. Additives
Such as flame retardant, brightening, antibacterial, antistatic, anti-oxidation and other varieties, unless the customer makes a request, the color masterbatch generally does not contain the above additives.
Development history editor broadcast
Color masterbatch is a new coloring product of plastics and fibers developed in the 1960s. It is a polymer compound made by loading pigments uniformly in resins. The masterbatch is mainly composed of three parts: colorant, carrier and dispersant.
According to relevant information, the average annual growth rate of demand for color masterbatch in other Asian countries is about 7%-9%, but the average annual growth rate of demand for color masterbatch in my country is about 20%. China is expected to become the fastest growing market for masterbatch demand. Especially for color and additive masterbatch, our country has to rely on imports. my country has become the largest producer and consumer of color masterbatch market in Asia. There are 330 enterprises producing color masterbatches in my country, among which there are 300 plastic-grade color masterbatch factories and 30 fiber-grade color masterbatch factories. These color masterbatch factories are mainly distributed in Fujian, Guangdong, Shandong, Zhejiang, Jiangsu, and Shanghai , Liaoning, Tianjin, Beijing, Hebei and other provinces and cities. There are nearly 50 enterprises with an annual production capacity of more than 1,000 tons of color masterbatch in my country, and the national color masterbatch production capacity is 300,000 tons per year. In 2001, the demand for color masterbatch in my country was less than 120,000 tons. Severe excess production capacity has led to the general underemployment of the domestic color masterbatch industry. In addition to the excessive growth of new production equipment and insufficient product orders, the important factor is that the domestic color masterbatch product structure is single, the variety is incomplete, and general-purpose products account for a large proportion. The specific gravity, while the proportion of high concentration and ultra-high concentration, multifunctional color masterbatch and color masterbatch for fine denier fiber is relatively small. In contrast, countries with a high level of color masterbatch technology have a complete range of raw materials such as pigments and dispersants, and have formed a serialized and specialized product structure. In terms of variety development, my country's color masterbatch manufacturers have developed color masterbatches for fiber, film, wire and cable, polyolefin color masterbatch, PVC color masterbatch, and injection molding products. Relevant experts believe that the color masterbatch will develop in the direction of multi-functionality, high color content and high technology content in the future, and the development of color masterbatch is accompanied by the improvement of production technology. [2]
Merit editor broadcast
1. Make the pigments have better dispersibility in the product. During the production of masterbatches, the pigments must be refined to improve the dispersibility and coloring power of the pigments. The carrier of the special color masterbatch is the same as the plastic of the product, and has a good match. After heating and melting, the pigment particles can be well dispersed in the plastic of the product.
2. It is beneficial to maintain the chemical stability of the pigment. If the pigment is used directly, the pigment will absorb water and oxidize due to the direct contact with the air during storage and use. Moisture isolation can keep the quality of the pigment unchanged for a long time.
3. To ensure the stability of the color of the product. The color masterbatch is similar to the resin particle, which is more convenient and accurate in metering. It will not adhere to the container when mixed, and the mixing with the resin is also more uniform, so it can ensure the stability of the added amount, so as to ensure Product color stability.
4. Protect the health of operators Pigments are generally in powder form, which are easy to fly when added and mixed, and will affect the health of operators after being inhaled by the human body.
5. Keep the environment clean.
6. Ease of use [1]
Heat resistance edit broadcast
The heat resistance grade of the special color masterbatch is generally compatible with the plastic used in the product, and it can be used with confidence under normal temperature. Only in the following cases will it cause discoloration to varying degrees, one is that the temperature exceeds the normal range, and the other is that the shutdown time is too long.
What is the difference between granulation coloring and masterbatch coloring?
Compared with granulation coloring, masterbatch coloring has the following advantages:
1. Coloring and product processing are completed at one time, avoiding the heating process of plastics caused by granulation and coloring, which is good for protecting the quality of plastic products.
2. Simplify the production process of plastic products.
3. Can save a lot of power
Will products colored with color masterbatch not fade?
There is no absolutely non-fading product, and products that use masterbatch coloring may still fade, but the degree varies for different grades of products, some are more obvious, and some are difficult to detect.
General color masterbatch and special color masterbatch editing broadcast
Special color masterbatch: It is a color masterbatch manufactured by selecting the same plastic as the carrier according to the plastic type specified by the user for the product. For example, PP color masterbatch and ABS color masterbatch use PP and ABS as carriers respectively.
Universal color masterbatch: Some kind of resin (usually low-melting PE) is also used as a carrier, but it can be applied to the coloring of other resins except its carrier resin. [3]
General-purpose color masterbatches are relatively simple and convenient, but have many disadvantages. It is recommended that you choose special-purpose color masterbatches.
Why don't many companies produce universal masterbatches?
The vast majority of formal masterbatch companies in the world generally do not produce general-purpose color masterbatches.
Universal color masterbatches have many disadvantages. In fact, the 'universal' scope of general-purpose masterbatches is very narrow, and the technical indicators and economic benefits are also poor, as shown in:
1. Poor predictability of coloring effect
The color masterbatch is used for coloring, and the pigment of the general color masterbatch will show different colors in different plastics, so the predictability of the coloring effect is poor.
2. Affect other properties of plastic products
Especially affecting the strength, the product is easy to deform and twist, especially for engineering plastics.
3. Higher cost
In order to be "universal" for general-purpose color masterbatches, pigments with higher heat-resistant grades are often selected, resulting in waste.
In addition to coloring, can the color masterbatch have functions such as flame retardancy, brightening, antistatic, antioxidation, and antiultraviolet radiation?
The color masterbatch can have some of these functions at the same time, if the factory asks for it.
Sometimes, although the customer does not make a request, the masterbatch company will also suggest that the user add some additives according to the needs of the product, such as adding certain additives to the masterbatch, such as brighteners. Of course, this will increase the cost of the product.
PrecautionsEdit Broadcast
1. How to use color masterbatch?
The use of color masterbatch is very simple, just mix it with resin particles according to the specified ratio, and mix it by hand.
The following issues should be paid attention to during the operation of the equipment:
1.1. The mixing cavity of the injection molding machine or extruder generally has multiple temperature zones, and the temperature near the blanking port should be slightly higher. Mix evenly, which is conducive to the good dispersion of the color masterbatch in the product.
1.2. Appropriately apply back pressure to the injection molding machine, which can improve the mixing effect of the screw and facilitate the dispersion of pigments. The side effect of applying back pressure is to slow down the injection molding speed.
1.3. Properly increasing the die head temperature of the extruder can increase the brightness of the product.
2. How to determine the proportion of color masterbatch?
The basis for determining the proportion of color masterbatch is to obtain a satisfactory coloring effect. As long as the surface of the product is uniform in color without streaks and spots, it can be recognized. The proportion of color masterbatch can be selected as follows:
1:100 Unless the mixing performance of the equipment is very good, it is easy to cause uneven dispersion of pigments, and it is generally not recommended for customers to use this ratio.
However, due to price pressure, some customers especially want to use this proportion of color masterbatch. For the sake of customers, they also produce more concentrated color masterbatch with such a low proportion, and the dispersibility of pigments can generally meet the requirements.
1:50 is used for plastic products with general coloring requirements, PE and PP color masterbatches are mostly used in this ratio
1:33--1:25 for PO products with higher coloring requirements, lower coloring requirements or general ABS products
1:20 for high-grade plastic products, including PO, ABS, can be widely used in injection molding, blow molding, spinning and other processes
More than 1:20 is generally used for coloring of high-grade cosmetic containers, mostly used for small injection molding machines
3. How to calculate the use cost of color masterbatch?
When calculating the cost of masterbatch coloring, the weight of the masterbatch itself should be deducted.
An example is as follows: add 2 kg of color masterbatch to 100 kg of plastic resin, and the total weight is 102 kg at this time, assuming that the price of resin is 10 yuan/kg, and the price of color masterbatch is 20 yuan/kg,
Then the cost increased due to the use of color masterbatch in 102 kg of plastic products is:
2 kg × (20 yuan/kg-10 yuan/kg) = 20 yuan
Converted into every 100 kg of plastic products, the increased cost due to the use of color masterbatch is:
20 yuan / 102 kg × 100 kg = 19.61 yuan
4. Will the use of color masterbatch increase the product cost?
Most of the time this is the case. However, in some cases, coloring with masterbatches is more economical than coloring with toners, because the colorist can achieve the coloring effect of higher-priced pigments by combining several lower-priced pigments.
Also consider the following two phenomena:
1. In many cases, the pigments selected by plastic product manufacturers are not the most economical when using toner for color matching. However, because they are not familiar with the pigments enough, it is very common to waste manpower and materials due to repeated trials during color matching. This problem does not exist with color masterbatch.
2. The grades of products colored with color masterbatch and products colored with toner are completely different, and their price is also higher. The higher price is often higher than the increased cost of using color masterbatch, so color Mothers can create "profits" instead. From this point of view, in some cases, it is more "economical" to use masterbatch coloring than toner coloring.
5. Does the masterbatch need to be dried before use?
Under normal circumstances, the color masterbatch does not need to be dried and can be used directly, but except for ABS and NY color masterbatch, they should be dried according to the conventional process.
How long is the shelf life of color masterbatch?
Color masterbatch can be stored for a long time.
The pigment in the color masterbatch is dispersed and fixed in the carrier resin and is in a closed state, and its quality will not change even if it is stored for a long time. But should be stored in a dry, cool environment
6. Can several different color masterbatches be used to prepare the color?
Generally, companies often use several color masterbatches to prepare specific colors for small-volume customers. However, without the guidance of the company's technical staff, customers should not make their own claims to use several color masterbatches together, let alone mix color masterbatches produced by different companies, to avoid incompatibility and cause losses.
7. Will the use of color masterbatch affect other properties of the product?
Some pigments affect the flame retardant effect of the product. When used in flame retardant products, it should be pointed out to the color masterbatch manufacturer.
8. Does the mold affect the use of color masterbatch?
In order to fully display the coloring effect of the color masterbatch, the mold must have corresponding quality, especially the surface must be very smooth.
Common defect edit broadcast
1. Under sunlight, there are striped pigment bands in the product
This problem needs to be considered from two aspects of plastic physical and mechanical properties and plastic molding process:
1.1 The temperature of the injection molding equipment is not well controlled, and the color masterbatch cannot be fully mixed with the resin after entering the mixing chamber.
1.2 The injection molding machine does not add a certain amount of back pressure, and the mixing effect of the screw is not good.
1.3 The dispersibility of the color masterbatch is not good or the plasticization of the resin is not good.
The process can be adjusted as follows: 1. Slightly increase the temperature of the part of the mixing chamber near the blanking port. 2. Apply a certain back pressure to the injection molding machine.
If there is still no improvement after the above debugging, it may be the dispersion or matching of the color masterbatch and resin, and you should contact the color masterbatch manufacturer to solve it.
2. After using a certain color masterbatch, the product is more likely to break
This may be due to poor diffusion and mutual solubility caused by the poor quality of the dispersant or additives selected by the manufacturer, which affects the physical and mechanical properties of the product.
3. The color is too dark (too light) after using according to the ratio on the color masterbatch manual
Although this question is simple, there are many possibilities, specifically:
3.1. The color masterbatch has not been carefully tested, and the pigment is too little or too much
3.2. The measurement is inaccurate during use, and there are a large number of random measurement by domestic enterprises, especially small and medium-sized enterprises
3.3. There is a problem with the matching of color masterbatch and resin. This may be due to the improper selection of the carrier of the color masterbatch, or the manufacturer may change the resin variety at will
3.4. The temperature of the machine is improper, and the color masterbatch stays in the machine for too long
Processing procedure: first check whether the resin type matches the color masterbatch and whether the measurement is accurate, and then adjust the machine temperature or speed, if there are still problems, please contact the color masterbatch manufacturer.
4. With the same color masterbatch, resin and formula, why do the products injected by different injection molding machines have different colors?
This is often caused by the injection molding machine. Different injection molding machines have different mechanical states due to different manufacturing, use time or maintenance conditions, especially the difference in the degree of closeness between the heating element and the barrel, so that the dispersion state of the color masterbatch in the barrel is also different. The above phenomenon will appear.
5. After changing to another brand of resin, the color of the same color masterbatch and formula has changed. Why?
The density and melt index of different grades of resin will be different, so the performance of the resin will be different, and the compatibility with the color masterbatch will also be different, resulting in color change. Generally speaking, as long as the difference between the density and melt index is the same If the color is large, the color difference will not be too large, and the color can be corrected by adjusting the amount of color masterbatch.
6. Will the migration of pigments during the storage of color masterbatch affect the quality of the product?
Some masterbatches have a high pigment (or dye) content, in which case migration is normal. Especially the color masterbatch with dye added will have serious migration phenomenon. But this does not affect the quality of the product, because after the color masterbatch is injected into the product, the pigment is in the normal color development concentration in the product.
7. Why are some injection products not glossy?
There are several possibilities:
7.1. The nozzle temperature of the injection molding machine is too low
7.2. The mold finish of the injection molding machine is not good
7.3. The molding cycle of the product is too long
7.4. Too much titanium dioxide contained in the color masterbatch
7.5. The dispersion of color masterbatch is not good
8. After a period of time, some plastic products will fade.
The quality of the basic pigments used by the manufacturer is not good, and drift occurs.
9. Why is ABS color masterbatch particularly prone to color differences?
Different grades of ABS produced in various countries have large color differences. Even for the same grade of ABS, there may be color differences in each batch. Of course, color differences will also appear after coloring with color masterbatches. This is caused by the characteristics of ABS, and there is no complete solution in the world. However, this chromatic aberration is generally not serious.
Users must pay attention to this feature of ABS when using ABS color masterbatch.
Production Process Editing Broadcast
Requirements for colorants for masterbatch
For the pigments used in masterbatches, attention must be paid to the matching relationship between the pigments, plastic raw materials and additives. The selection points are as follows.
(1) Pigment cannot react with resin and various additives, has strong solvent resistance, small migration, good heat resistance, etc. That is to say, masterbatch cannot participate in various chemical reactions. For example, carbon black can control the curing reaction of polyester plastics, so carbon black cannot be added to polyester.
Since the forming temperature of plastic products is relatively high, the coloring material should not decompose and change color under the condition of forming heating temperature. Generally, inorganic pigments have better heat resistance, while organic pigments and dyes have poorer heat resistance. This should be paid enough attention to when selecting colorants.
(2) The dispersibility and tinting strength of the colorant should be good. When the pigment is dispersed unevenly, it will affect the appearance of the product; when the coloring power of the pigment is poor, the amount of the pigment will be increased, and the cost of the material will increase. The dispersibility and tinting strength of the same colorant in different resins are not the same, so you should pay attention to this when choosing the colorant.
The particle size of the colorant is also related to the dispersibility. The smaller the particle size of the colorant, the better the dispersibility and the stronger the tinting power.
(3) Other properties of colorants should be understood, for example, for plastic products used in food and children’s toys, the colorant should be non-toxic; for plastic products used in electrical appliances, colorants with good electrical insulation should be selected; For outdoor plastic products, colorants with good weather aging resistance should be selected.
The production process of masterbatch
The production process of color masterbatch is very strict, and wet process is generally used. The color masterbatch is made by water phase grinding, phase inversion, water washing, drying, and granulation. Only in this way can the product quality be guaranteed.
In addition, while the pigment is being ground, a series of tests should be carried out, such as measuring the fineness of the sand grinding slurry, measuring the diffusion performance of the sand grinding slurry, measuring the solid content of the sand grinding slurry, and measuring the fineness of the color paste.
There are four methods for the production process of color masterbatch:
(1) Ink method: As the name suggests, it is the production method of ink color paste in the production of masterbatch, that is, through three-roll grinding, and a low-molecular protective layer is coated on the surface of the pigment. The ground fine color paste is mixed with the carrier resin, then plasticized by a two-roll mill (also called a two-roll mill), and finally pelletized by a single-screw or twin-screw extruder.
The process is as follows:
Ingredients stirring coarse color paste three-roll grinding fine color paste two-roll plasticizing extrusion granulation
(2) Washing method: the pigment, water and dispersant are sanded to make the pigment particles smaller than 1 μm, and the pigment is transferred to the oil phase by the phase transfer method, and then dried to obtain the masterbatch. An organic solvent and a corresponding solvent recovery device are required for phase inversion. Its flow is as follows:
Rinse the fine color paste, dry the concentrated material by evaporation, add the carrier, extrude and granulate
(3) Kneading method: After mixing the pigment and the oily carrier, the pigment is flushed from the water phase into the oil phase by using the lipophilicity of the pigment through kneading. At the same time, the surface of the pigment is covered by an oily carrier, so that the dispersion of the pigment is stable and the aggregation of the pigment is prevented.
(4) Metal soap method: after the pigment is ground, the particle size reaches about 1 μm, and soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap liquid, forming a layer of saponified liquid, which acts as a metal After the salt solution is added, it chemically reacts with the saponified layer on the surface of the pigment to form a protective layer of metal soap (magnesium stearate), so that the finely ground pigment particles will not cause flocculation and protect certain fine particles. Spend.
Matters needing attention in the use of masterbatch
(1) The color masterbatch will absorb moisture after being stored for a period of time, especially PET, ABS, PA, PC, etc., so it should be dried according to the same process as the original color to meet the moisture content requirements.
(2) It must be very careful to use masterbatch to match color to achieve the required color, and color difference and color light change often occur.
(3) The color masterbatch and other additives will react, so be careful when using it.
(4) Attention should be paid to the selection of the dilution ratio of the masterbatch. If a high dilution ratio is selected, the production cost is lower, but it is also limited by the processing equipment.
Masterbatch ClassificationEdit Broadcast
The classification methods of color masterbatches are commonly used in the following categories: [4]
Classified by carrier: such as PE color masterbatch, PP color masterbatch, ABS color masterbatch, PVC color masterbatch, EVA color masterbatch, etc.
Classification by use: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc. Each variety can be divided into different grades, such as:
1. Advanced injection masterbatch
Used in cosmetic packaging boxes, toys, electrical casings and other high-end products.
2. Ordinary injection masterbatch
Used in general daily plastic products, industrial containers, etc.
3. Advanced blown film color masterbatch
Used for blow molding coloring of ultra-thin products.
4. Ordinary blown film color masterbatch
It is used for blow molding coloring of general packaging bags and woven bags.
5. Spinning color masterbatch
It is used for textile fiber spinning and coloring. The masterbatch pigment has fine particles, high concentration, strong tinting strength, good heat resistance and light resistance.
6. Low-grade color masterbatch
Used in the manufacture of low-grade products that do not require high color quality, such as trash cans, low-grade containers, etc.
High-grade black mother
Tianhei 2014, Tianhei New 2014, Tianhei 2014A, Tianhei 2014B, Tianhei 3040, Tianhei 3040A, Tianhei 3040B, Tianhei 168, Tianhei 169, Tianhei 998 , Tianhei brand 3807, food grade black mother.