In order to ensure a good coloring effect, in addition to the need to pay attention to the quality of the coloring process and color masterbatch, we should also pay attention to the following points in the use process.
Precautions for the use of black masterbatch materials:
1. In order to reduce the color difference of the fiber after color matching, the black masterbatch should be diluted and the mixing share should be controlled, the filament should not be less than 3% ~ 10%, the staple fiber should not be less than 1% ~ 3%, the monochrome bulking filament should be spun with three-color equipment, and the black masterbatch must be entered into the extruder after mixing, and the mixing device can be added to the extruder section for the mixing ability of the melt itself.
2. After the color formula of the black masterbatch is determined, the black masterbatch is evenly dispersed in the polypropylene slice before spinning, which is the key to ensuring the quality of the product, and there are two types of detailed mixing methods. One is the heavy method and volume method, after melting the black masterbatch in the extruder or at the back, it is injected into the polypropylene melt with a small extruder, and the uniformity is very good. Black female
3. When selecting black masterbatch, it is necessary to select according to the scale of selection, polypropylene masterbatch has fine denier grade, coarse denier grade, coarse denier black masterbatch color can not be used for fine denier grade color matching, color matching should consider the number of monofilament denier of spinning fiber, select the same grade of black masterbatch.
4. The black masterbatch selected is best the product of the same manufacturer, and the high-concentration black masterbatch should be selected in order to reduce the cost. The pigments of black masterbatch are divided into high, medium and low grades, and different grades of black masterbatch should be appropriately selected according to the quality requirements of the fiber formation when matching colors. In order to prevent the quality variation of the fiber caused by the different light and heat stability of the pigment, the color matching should also select the black masterbatch color with the same light and heat stability level that meets the quality requirements of the fiber.
Most of the black masterbatches used on the market use PE as the masterbatch carrier. Because the masterbatch developer takes into account the compatibility (versatility) of the masterbatch with a variety of plastics, as well as the fluidity, temperature resistance, convenience of masterbatch production and cost accounting when planning the formula, LLDPE is generally selected as the carrier of the black masterbatch, so this kind of masterbatch can be called a general black masterbatch. If the carrier of masterbatch is concerned, this kind of product should be called PE black masterbatch strictly speaking. Under normal circumstances, the increase of masterbatch is not high, under this premise, the downside of PE black masterbatch will not be highlighted, but its instability factors still exist, so we initiate the selection of black masterbatch with special carrier.
For example, the black masterbatch used for ABS materials should be made of ABS materials as carriers and pigments and additives. For another example, for the black masterbatch used on PC data, PC material should be used as the masterbatch carrier.
As long as the color masterbatch produced by the same plastic carrier is selected, it will not affect the compatibility between the masterbatch and the use of the materials, will not peel or delamination, will not affect the impact, tensile, inflection, flame retardant and other physical parameters of the use of materials or products, and will not affect the brightness of the appearance of the products.
The production process of the black mother manufacturer is briefly introduced as follows:
1. Black masterbatch ink method: as the name suggests, it is a production method that selects ink colorant in the production of black masterbatch, that is, after three rollers of grinding, a layer of low molecular protective layer is coated on the surface of the pigment. The ground fine color paste is then mixed with the carrier resin, and then plasticized by a two-roll plasticizer (also called a double-roll open mill), and finally granulated by a single-screw or twin-screw extruder.
2. Black masterbatch scouring method: the pigment, water and loose agent are sanded to make the pigment particles less than 1μm, and the pigment is transferred to the oil phase through the phase handling method, and then dried to obtain black masterbatch. Organic solvents are required for phase transfer, as well as corresponding solvent recovery equipment.
3. Black masterbatch kneading method: after mixing the pigment with the oily carrier, the pigment is used to be lipophilic, and the pigment is washed from the water phase into the oil phase after kneading. Together, the surface of the pigment is coated by an oily carrier to make the black mother pigment disperse and stabilize and avoid the agglutination of the pigment.