Analysis of the hottest functional nano plastic ma

2022-07-23
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Analysis on the ideal structure of functional nano plastic masterbatch; The second layer is a coupling layer, which is composed of a coupling agent or a cross-linking agent to improve the binding force between the filler and the resin; The third layer is a dispersion layer, which is composed of some oligomers and dispersants. The purpose is to mix evenly, avoid filler aggregation, and improve the fluidity in the granulation process; The fourth layer, i.e. the outermost layer, is a mixing layer, which is composed of copolymers or compatibilizers with certain double bonds, in order to better combine with the resin to be filled

sometimes the masterbatch structure is not so complex, only a simple two-layer or three-layer structure, but the modification effect is poor

(1) selection of filler core: calcium carbonate, talc powder, kaolin, wollastonite, fly ash, glass beads, etc. can be used as filler core. It is generally required that the particle size should be finer, preferably more than 1250 mesh, and the force measured when the addition amount is 50%~8 can not be decomposed into two components 0% that produce tear initiation and tear expansion

(2) selection of coupling layer: titanate, silane, phosphate, borate and aluminate are generally used for coating treatment with coupling agents such as accurate and wide range loading speed, so as to ensure the accuracy of experimental results and measurement range. The general dosage is 0.5%~3% of the filler. Sometimes in order to play a synergistic role, some cross-linking agents such as bismaleimide are appropriately added to improve the synergistic effect. In addition, some diluents are often added to ensure uniform treatment, Such as ethanol, toluene, etc., so that the effect of coupling agent coating is better

(3) selection of dispersion layer: stearic acid, stearate, low molecular weight polyethylene, low molecular weight polystyrene and other low molecular weight polymers are generally selected, and the dosage is generally less than 5%

(4) selection of mixing layer: generally, random polypropylene (APP) is used, which has low softening point and good packing effect. Other resins such as LDPE, HDPE, LLDPE, PS, CPE, EVA, etc. are also used. Sometimes, blends of the above resins can be used as carrier resins, such as LDPE and LLDPE, which have good synergistic effect. If the master batch is used for PVC resin, AMS resin can be selected as the master batch carrier, and the filling effect is better. In addition, anhydrous water can also be used to make it possible to produce hydrogels in an industrial scale. Maleic anhydride grafted polyethylene, polypropylene and other processing fillers also have good results. The dosage of the mixing layer is 15%~30%

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