7 strokes learn this, not afraid to choose non-woven masterbatch?

Spunbond non-woven fabric is the fastest growing industry in the development of non-woven varieties, accounting for about 40% of the total production of non-woven fabric. Non-woven from colorful masterbatch. However, in the non-woven fabric coloring color issues encountered it is a headache.

Color is colored polypropylene spunbond non-woven production method is a common phenomenon, a reasonable choice masterbatch composition and correct process control can maximize the color will be controlled within a reasonable range, improve product quality.

How can we improve the non-woven fabric coloring effect? Listen Xiaobian to support 7 strokes:

1. Pigment

Masterbatch pigment is the main component, mainly inorganic pigments Received Date: 2007.03-02 and organic pigments into two categories. Inorganic pigments are generally metal oxides, sulfides or metal, has good lightfastness and weather resistance, light resistance which is poor for polypropylene resin is of great significance. The disadvantage is that a larger particle size; and organic pigments have a coloring power, good dispersion, bright color, etc., but it tends to cause desaturation in the light, easy to cause coloration finished fading, suggested the use of suitable inorganic pigment particle size . The heat-resistant paint in the color refers to the occurrence or performance in the production or use of temperature change color temperature, requiring heat resistance at about 250 ℃, at this small color colored products; and selected pigment migration resistance to> 5 level, light resistance 6 to 8, with a polypropylene resin has good compatibility with other additives synergies well in the spinning process solid color; for health care and maternal and infant supplies, paint can not be contained by health hazards of heavy metals such as cadmium, lead and mercury. Pigment particle size directly affects the properties of the pigment dispersion and the finished product, if the pigment particle size is too small, surface area, surface free energy will be large, easy to accumulate into the group, resulting in uneven dispersion in the polypropylene resin; if Pigment particle size is too large, it will clog the filter plate and the nozzle plate in the production of the fiber in tension increased fuzz and breakage phenomena, and even make the resin or additives due to stay too long and the resulting thermal decomposition, Effect of physical and mechanical properties of the fiber. Usually the pigment particles have an average diameter of control between 0.1--0.5 / 1m.

2. The carrier

Masterbatch carrier is a matrix, enables granular masterbatch, accounting for 30% to 50% masterbatch, the carrier should have a good affinity with the pigment and compatibility with the coloring to consider when selecting a carrier Influence of the coloring system other properties and resin compatibility.
Since spinning speed greater spunbond process, molecular weight distribution and support more stringent requirements, suggested the use of a melt index of metallocene catalyst 2010min about synthetic polypropylene. Metallocene catalyst synthesis of polypropylene, the molecular weight distribution coefficient <4, can effectively improve the pigment in the masterbatch and dispersion of Concord, finished solid color, beauty enhancement, improve physical and mechanical properties, can be prepared as a pigment content 80% of the high concentration masterbatch, reduce production costs.

3. dispersant

Dispersants can be encapsulated in the surface of the pigment particles, reducing the surface free energy of the pigment, the pigment dispersion into fine and stable particles are uniformly distributed in the melt, and agglomerate during processing does not occur. Typically require a dispersant and a pigment having good affinity with the carrier having good compatibility. From the economic and practical sense, it suggested the use of polypropylene wax as a dispersing agent, a high softening point, narrow molecular weight distribution, no smell, can significantly improve the masterbatch coloring capacity, reduce color, reduce spinning interrupt wire, drop wire phenomenon. The most commonly used dispersants are powdery or flake. Particles significantly larger than ordinary wax pigment particles, pigment particles to wrap uneven, suggested the use of micronized wax. Micronized wax and pigment particle size dimensions close, wax particles are filled between the pigment particles in the pigment particles can maintain a certain distance and provide wetting, can significantly improve the pigment dispersion.

4. The composite indicator of masterbatch

5. The amount of masterbatch

Masterbatch staining results directly affect the amount of spinning processes and products. Adding less, dyed deep enough or uneven dyeing, adding an excessive amount, it will form artificial impurity, increasing the spinning difficult. At the same time due to the lower than conventional sliced ​​masterbatch melting point, high gradation, so that the melt viscosity changes, spinnability deteriorates yarn stretch performance. Practice shows that when the amount at 1.2% to 3.6% on finished dye good, good spinnability.

6. masterbatch mixed people position

After all, the conventional masterbatch somewhat slice quality index difference, in order to reduce the thermal decomposition of masterbatch, conditional manufacturers, masterbatch hot-melt should use a separate dedicated small screw, and through the metering device with large direct mixing screw melt into the melt filter.

7. Other aspects

In order to reduce the finished color, but also pay attention to the following aspects in production.
(1) establish standards for each masterbatch sample at a certain ratio, according to the ratio of the standard sample of masterbatch into the plant after mixing proofing test, and compared with a standard sample;
(2) into the plant of the same species, same batch of masterbatch were mixed on the same species, different batches of masterbatch should be mixed;
(3) Before masterbatch into the screw, to try to remove the particles are too large and too small masterbatch, in order to ensure a uniform and completely melt in the screw;
(4) in the production of a color number halfway Try not to replace masterbatch lot.

Therefore, in the production process of the nonwoven fabric, you can refer to more than seven recommendations Oh! Correct and effective use of staining methods in order to make non-woven colored multiplier Oh!

RAJ Yancheng Masterbatch Co., Ltd. Main polypropylene, nonwovens masterbatch, black masterbatch masterbatch products. If necessary, please call us!

Total Ni Mobile: 13805103263
Hotline: 0515-88322183