There is absolutely no colorfast products, use the color pink mother color of products is also is still likely to fade, just at different levels according to different grades of products, some more obvious, others are difficult to detect.

Plastic coloring products are influenced by many factors will fade. Plastic coloring products fade and pigments, light fastness of dye, the oxygen resistance, heat resistance, acid-proof alkaline, and the properties of resin used. Should be used according to the plastic products processing conditions and requirements, at the required during the production of masterbatch pigments, dyes, surfactants, dispersants, the performance of carrier resin and anti aging agent can be used only after comprehensive assessment.

Color masterbatch for pigment first preprocessing, high tinting strength, dosage is lower and the quality is stable, transportation, storage, easy to use, greatly reduce the environmental pollution.

Dispersant on the surface of a pigment wetting, penetration to exclude air, scatter agglomerations, aggregate into tiny, stable and uniform particles, and are no longer together, in the machining process commonly used dispersant for low molecular weight polyethylene wax, for difficult to disperse organic pigments and carbon black by EVA wax or oxidized polyethylene wax, synthetic low molecular weight polyethylene and polyethylene wax cracking the legal system of low molecular weight polyethylene wax have very big difference.

Other additives with coupling agent, antioxidant and light stabilizer, antistatic agent, filler, etc., depending on the requirements and variety addition amount, known as multi-functional masterbatch, or join brightener, beneficial to molding products stripping and improving the products surface brightness.

Performance of the color masterbatch have off color, white, yellow, yellowing, thermal stability, oxygen index, melt flow rate, etc., of course the fineness of pigment, mobility, chemical resistance, toxicity is related to the performance of masterbatch, some indicators in the special use is very important, such as fiber masterbatch filter values (DF) fineness.

1. Light fastness and light fastness of the colorant directly affect the products fade, the glare of outdoor products, the light of colorants used (fast) level requirement is an important index, light level is poor, products in use will soon fade. Weather resistance of products to choose light shall be not less than 6 grade, had better choose 7, 8, interior products optional four, five. Carrier resin light resistance to change the color also has a great influence, its molecular structure before and after the resin caused by exposure to the sun's ultraviolet rays fade changes occur. Join in the masterbatch light stabilizer and so on ultraviolet absorbent, can improve the coloring and shading light resistance of plastic products.

2. The heat resistant pigments thermal stability refers to the processing temperature pigment thermal weightlessness, the degree of discoloration, faded. Inorganic pigment ingredients for metal oxides and salts, good thermal stability, high heat resistance. While organic compound paint under a certain temperature will occur the change of the molecular structure and a small amount of decomposition. Especially PP, PA, PET products, processing temperature above 280 ℃, when picking colorant to pay attention to the heat resistance of paint on one hand, on the one hand, want to consider the heat resistance of paint, usually require heat time is 4-10 rain...

Of certain metal ions will promote the thermal decomposition of resin, pigments, copper, manganese, iron, cobalt pigments such as ageing effect for promoting the polyolefin, cadmium, calcium, potassium, sodium, such as paint. Same metal elements according to the order of the pure metal, metal oxides, metal salts.

3. The oxidation resistance of some organic pigments in the degradation of macromolecules in the aftermath of the oxidation or other changes, and gradually fade, the process is a process of high temperature oxidation, the second is of strong oxidizer (such as chromium Huang Zhong chromic acid radical) oxidation. Lake, after using azo pigment mixed with chrome yellow, red will gradually subside.

4. The acid and alkaline coloring plastics faded and chemical character of the colorant (acid and alkali resistance, reducing oxide). Such as chromium molybdenum red resistance to dilute acid, but sensitive to alkali, cadmium yellow don't acid, these two pigments and phenolic resin for some colorants have strong reducing effect, the serious influence of colorant heat resistance, weather resistance and fade.

The application of color masterbatch

Conventional color masterbatch carrier resin and products should choose the same type of polymer matrix resin, the purpose is to ensure that the carrier resin with matrix resin chemical compatibility. Such as copolymerization POM resin can be used as a carrier resin in homopolymerization of POM resin, SAN resin can be used as carrier resin, ABS matrix can be used in the PA66, PA6 as carrier resin PA46 tinted.

Reason is the low melting point of PA6, belong to the same nylon natural compatible, ensures good mixing and dispersing. In addition, for some kind of plastic alloy, the alloy can be used in one of two kinds of polymer as the color of the matrix resin.

Color masterbatch is added to the amount of resin is commonly 2 ~ 5%. In the calculation of matrix resin, the content of carrier resin accounts for at least 1 ~ 3%. That makes it one of the biggest additive content of additives series, so when determining the carrier resin is important to note the details. If use in the process of masterbatch production incompatible resins as carrier, however, is essentially a deliberate introduction of impurities or contaminants.

Injection molding factory imagine if in ABS or PS, PBT, VAT find PE granular materials, they will be abandoned it or pick out these PE sundries. However, many people are concerned about is how manufacturers at the lowest cost to meet the required color. , including more filling agent, using the cheap paint even recycled materials, and so on. The most common is the use of cheap polymers such as PE or ethylene copolymer such as LLDPE, POE, EVA.

The relationship between injection temperature and color deviation know how much

The color of the injection molded parts, will be affected by the change of the melt temperature and change. Typically differ temperature around 10 ℃, can see the color deviation of molded parts.

Therefore, when the color of the plastic and sample deviation is not very big, should be solved by adjusting the temperature. Within the scope of the raw material of normal injection molding temperature adjust up and down for 5 to 15 ℃, has received the effect of the improved color deviation.

In most cases, temperature rise, the dark will becomes shallow, white to yellow. On the other hand, the temperature to reduce the color darker, white is more white. But there are individual colors are opposite and elusive, for example with the fluorescent color is more difficult to let a person elusive.

If color deviation is too large, difficult to solve by adjusting the temperature, then notify the palette color staff is not late again, so can reduce a lot of color. But to bear the palette in the injection molding temperature required for the production of the product to carry on the adjustment, otherwise the production with different color temperature and color deviation.

Due to large temperature to absence made the color, so production is also must pay attention to control the temperature. Once the colors have been confirmed, the temperature changes in the scope should be kept within the plus or minus five degrees. Absence made larger by temperature, such as the light, even to pay attention to the glaze temperature and time cannot too much and too long, otherwise also can cause instability on the color of absence made, still it is with the fluorescent color and purple. Therefore, if a certain need drying of material for a long time solve the problem of water vapor, had better be to go after drying the material and color.

Injection molding processing to add color mother common problems and processing

In sunlight, products have the paint with stripes

This problem should be from plastic physical and mechanical properties and plastic molding process two aspects to consider:

1. The temperature of the injection molding equipment didn't control well, after the pigment into the mixing chamber can't fully mixed with resin.

2. Injection molding machine without a back pressure, screw mixing effect is not good.

3. The pigment dispersion of plasticizing or resin.

Process the debugging

1. The mixing of mouth cavity by blanking part temperature increase slightly

The injection molding machine 2. Under certain back pressure.

If the above debugging is still not good, may be masterbatch and dispersion of the resin or matching problem, should be resolved contact masterbatch manufacturer.

Use some color mother, products appear more easily broken

This may be due to the manufacturer chooses the spread of the dispersant additives or quality is not good cause bad miscibility, physical and mechanical properties of the affected products.

Color master the directions according to the proportion of after use, color too deep, too shallow)

The problem is simple, but there are many possibilities, specific as follows:

1. Without seriously try to color masterbatch, paints too little or too much

2. When using inaccurate measurement, measurement phenomenon at a large number of domestic enterprises especially small and medium enterprises

3. The matching problem of pigment and resin, this may be improper selection is the carrier of masterbatch, can also be resized resin manufacturers

4. The machine temperature is undeserved, masterbatch stay too long in the machine.

Handler: first check whether resin varieties and mother color matching, measurement is accurate, then adjust the temperature or the machine speed, such as there is still a problem to contact masterbatch manufacturer.

The same pigment, resin and formula, different injection molding machine injection depth is why the color of the products have?

This is often caused by the reason of the injection molding machine. Different injection molding machine for the manufacture, the using time or the maintenance condition is different, causing the difference between the state of machinery, especially the difference of original heating and the degree of close to the cylinder, the pigment in the dispersed state in the cylinder is different also, the above phenomenon will appear.

In another sign of resin, the same color and formula, color is changed, is this why?

Different type of resin its density and melt index will have difference, so the performance of the resin will have difference, and the compatibility of color master also can have differences, so as to change color, generally speaking, as long as its density and melt index were similar, so the color difference is not too big, can be more is by adjusting the dosage of the masterbatch color.

Pigment dye migration occur in the process of storage will affect the quality of the products?

Some pigment pigment content (or dyes) high, in this case, the migration phenomenon is normal. Especially to join dye masterbatch, serious migration phenomenon happens. But this does not affect the quality of the products, because mother color after injection into products, paint is in normal color concentration in the products.

Some bad injection products luster

There are a variety of possibilities:

1. Injection molding machine nozzle temperature is too low

2. Injection molding machine mold finish is not good

3. The products molding cycle is too long

4. Too many pigment contained in the titanium dioxide

5. Pigment dispersion is not good

After a period of time, some plastic products fade phenomenon will happen

Manufacturers adopted basic paint quality is bad, drift occur.

ABS color female particularly prone to color difference

Countries to produce different grades of ABS color difference is bigger, even the same brand of ABS, each batch batch, there may be color difference after using masterbatch coloring, of course, also can appear off color. This is due to the characteristics of ABS, has not yet been thoroughly solution in the world. However, the color difference is not serious.