Masterbatch industry is also accompanied by the development of related industries and significant development, masterbatch production technology level has been unprecedented progress in masterbatch applications are constantly expanding. However, due to the influence of traditional Chinese model of market competition, often always the pursuit of "low-quality, low-cost, can" lead to downstream applications masterbatch production is not stable enough, the quality of low-grade products less competitive, the subject has been many applications masterbatch manufacturers widely recognized, especially for high quality polypropylene manufacturers pay more attention to the impact on the quality of masterbatch polypropylene quality. To this end, according to the requirements of polypropylene fiber industry associations, to discuss the impact of the polypropylene masterbatch quality
A masterbatch dispersed in polypropylene fibers
Polypropylene fiber with a variety of colors, is caused by the pigment particles are uniformly dispersed in polypropylene fibers, the key is fully refined and pigment particles distributed (mixed) evenly in the polypropylene fibers. Refinement dispersed pigment particles is sufficiently refined and distributed (mixed) evenly in the polypropylene fibers. The pigment dispersion is a refinement of aggregates or crushed reunion body to particles to a minimum, but the key is uniformly dispersed, the dispersion effect of colored polypropylene fiber luster, transparency, gloss, fiber strength, elongation, resistance to aging , overcast rate etc affected.
In general, the pigment dispersion can be used for particle size less than 1um fibers or thin films, and will lead to greater than 5um fiber table? ** Kaoru Xiang? Will lead to greater than 10um fiber surface spots, streaks, and with the grain diameter increases the fracture strength of the fiber elongation declining. More fine particle coloring stronger, better dispersion, while the smaller particle size of the surface increases, resulting in increased hiding power.
Since the pigment particles have a state primary particles, aggregates, reunion body three, and general merchandise pigment particles are larger than the reunion of body particles (about 75-250um), it must be distributed processing, so-called pigment dispersion of the reunion is to body shredding process refinement.
The pigment dispersion is first wetted with a wetting agent, a pigment, coated on the surface of the pigment, the pigment so that the cohesion between the reduced, decreased fragmentation body pigment reunion energy required, followed by crushing of the pigment, the pigment particles leading between freedom of movement (impact stress) by four weeks and body pigments reunion medium shear stress to the reunion particles broken. after the pigment dispersion by refinement, particle size reduction, the surface area increases, the paint surface free energy increases resulted in a fine instability of the pigment, the pigment in the surface to be coated to further processing, reduce the interfacial surface energy of the newly formed, preventing re-aggregation, the pigment is mixed and dispersed in the melt, i.e. a pigment wetting and pulverized uniformly dispersively distributed into tinted material.
Second, the performance and quality requirements masterbatch
1. PP masterbatch performance requirements
Polypropylene is a pure hydrocarbon molecular chains containing a tertiary carbon atom, heat, by light in a tertiary carbon atom is easy to dispose of the sub-cracking, so the deterioration of polypropylene, it requires a high temperature masterbatch made in spinning easy to spread, without damaging the quality of the fibers, the fibers do not fade, has excellent light fastness, abrasion resistance, solvent resistance, withstand rigorous spinning draft.
(1) heat resistant masterbatch pigment selected basic requirement polypropylene fiber withstand temperature during production, to maintain its stable performance. Temperature requirements for the above temperature is generally 270 ~ 280 ℃.
(2) dispersion Masterbatch pigment dispersion should be good, and to be uniformly dispersed in the masterbatch, and dispersant use does not reduce the quality of polypropylene fibers. Or can not produce a good quality liquid coloring fibers, running it is not stable, easy to break or abnormal fibers during fiber drawing.
(3) brightness polypropylene liquid coloring a variety of purposes, including fabric and knitted fabric for bedspreads, requires bright colors. Because organic pigment relatively bright, colorful, and easy to color, so any use for these purposes need to use organic pigments.
(4) under the action of light in the light of some pigments sensitive to light, the colored fibers fade and brittle damage, pigment lightfastness and substantially related to its chemical structure, so in the production of masterbatches to fully pay attention pigment lightfastness when light resistance requires the use of pigment, consider adding an ultraviolet absorber.
(5) the stability of the masterbatch used in pigments, coloring polypropylene fibers have good stability. Means colored polymer fibers by prolonged exposure to heat, light or subjected to high temperatures pigment does not react with the fiber to form a new chemical groups to make Crimson low polymer properties. Therefore, the masterbatch should be used as pure pigments contain iron, copper, lead salt impurities, to ensure good physical properties of the colored polypropylene fibers.
(6) water resistance, dry resistance, oil resistance, colored polypropylene fiber products during use and inevitably go through washing or dry-cleaning solvent, to come into contact with oil, particularly for carpet, so its use should colorant good washing resistance, dry resistance, oil resistance.
2. PP masterbatch quality requirements
Masterbatch quality indicators include more content. Such as the appearance of size is generally 2 mm × (3 ~ 4) mm, masterbatch ≤1um pigment particle size of 90%, melting point, DF value, MI value, weather resistant characteristics. These indicators are masterbatch plant, polypropylene fiber plant topics of common interest.
(1) filtration performance fiber grade masterbatch by filtration to characterize the performance of students masterbatch quality, its value is known as the small DF value, the spinning process filtering component replacement cycle is relatively long, generally require PP masterbatch DF values less than 2.0 × 105Pa.㎝2 / g.
(2) Melting point PP Masterbatch dispersant with low molecular weight polyethylene wax, the melting point between 110 ~ 120 ℃; and pigments generally a high melting point than polypropylene spinning temperature, so thermal analysis spectrum masterbatch there are two on the endothermic peak of the low melting point but masterbatch masterbatch can not characterize the quality of the pros and cons, and some corporate standards specified melting point 130 ~ 160 ℃.
(3) Melt activity index (MI value) of polypropylene slice MI mainly used to characterize the molecular weight of the size of the decision process and the performance of its chips into fibers finished after. Masterbatch containing a pigment, a dispersant and a low-molecular carrier polyethylene wax, it is not used to the level of the table MI seek their own molecular weight, and will vary depending on variety and pigment changes, it is not the masterbatch masterbatch MI control indicators for reference only spinning. Select spinning masterbatch MI slices slightly larger than the qualities, good for both size and similar mixing. General requirements for the MI values ​​(15 ~ 30) g / 30min.
(4) heat-resistant masterbatch heat index refers to the masterbatch and polypropylene sections were at different temperatures of 5 to 10 minutes spinning cycle by a certain percentage, the degree of observed changes in their color. The color change is available assessing change in color gray color sample card or sample card comparison evaluation, when the total value of the color ⊿E≤3, this temperature is the temperature of this heat-resistant masterbatch, usually requiring heat 270-300 ℃, glorious change to level 4.

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