Dispersant and carrier selection of masterbatch quality

We all know that the masterbatch is mainly composed of pigment, dispersant and carrier of three parts. For the selection of pigment, we have done a lot of related introduction, today, jade jade mainly introduce some relevant knowledge about dispersing agent and carrier, and everybody study together!
 
dispersant
In the masterbatch of thermoplastic polymer in general due to the bad compatibility and polymer dispersant can influence on the performance of the polymer spinning, so it's best to use the polymer itself as dispersant. Can choose low molecular weight polymer or oligomer. As points of polypropylene fiber masterbatch teach agent, the foreign usually with low molecular weight polyethylene wax (PE), it can not only increase yan debate smell office repulsive force, prevent pigment particles in the polymer flocculation, at the same time can improve the performance of the flow of polymer melt spinnability.
 
Polyether is also a kind of good pigment dispersant of polyolefin system, also has advantages of liquidity, good antistatic performance.
 
In addition, there are many used as dispersant of anionic surfactant. Such as thermal stability good amine. Including primary amine, secondary amine and tertiary amine (heterocyclic tertiary amine, alkyl imidazoline, etc.); Anionic surfactant may be adopted. Commonly used is fatty acid and its salts, such as zinc stearate, sodium dodecyl sulfate, liquid paraffin, sunflower oil, etc.
 
In order to give full play to the characteristics of various dispersants, mixing effect is more ideal. Entropy function dispersed repulsion, if only to provide dispersant just add a little, in order to mixed with polypropylene good dispersant must be above a certain amount, generally in the masterbatch addition amount for 1/3 of the polypropylene.
 
 
 
The load body
Carrier should choose some of polymer and polypropylene has good compatibility, low melting point than spinning resin 20-30 ℃, it not only does not affect the quality of the products and of pigment flocculation resistance; At the same time has good dispersion (that is, the concentrated pigment resin dilute diffusion performance of resin). Commonly used by the carrier of polypropylene masterbatch polyolefin, the optional are: 1.5 ~ 20000 high-pressure polyethylene, low-pressure polyethylene or polypropylene melt index of 20.