Film blowing formula and technology -- the effect of filling material
Effect of filler on flow rate of solution of base material
The influence of the addition amount of calcium carbonate, carrier resin and PE wax on the melt flow rate of the base material was discussed. The results are shown in Figures 1 to 3.
Figure 2: Influence of different carrier resins on the melt flow rate of the master material
Figure 3: Effect of PE wax dosage on melt flow rate of base material
Figure 1 shows that the melt flow rate of the base material decreases with the increase of calcium carbonate dosage (50-110 parts). On the one hand, due to the different interface properties of inorganic mineral calcium carbonate powder and carrier resin, poor compatibility, low binding ability, at the same time, as a small molecule, calcium carbonate filled into the carrier resin macromolecular chain, increased the distance between molecules, molecular thermal motion weakened, not conducive to flow. As can be seen from Figure 2, 1C7ALDPE carrier resin has the largest melt flow rate corresponding to the master material. This is because the MFR of the carrier resin will affect the overall viscosity of the matrix formulation system. Then affect the flow performance of the master material. The carrier resin with higher melt flow rate will enhance the fluidity of the master material. The fluidity of LDPE parent material is better than UDPE parent material because the melt viscosity of the latter is higher than that of the former. In addition to the competitive advantage of price, recycled POLYETHYLENE used in carrier resins has reduced molecular weight and improved fluidity due to repeated use and thermal processing.
As can be seen from Figure 3,PE wax, as a dispersant (lubricant), can moisten fine powder additives, avoid re-condensation in the forming process, promote the uniform dispersion of calcium carbonate and LDPE in the products, and improve the fluidity. However, as the amount increased further, the remaining dispersant after wetting would precipitate to the surface, blocking the flow. The effect of coupling agent on the fluidity of master material was discussed in the previous experiment, and aluminate coupling agent had better comprehensive effect. In addition, the aluminum acid and vinegar coupling agent is light in color, which has high thermal stability coordination effect and lubrication plasticizing effect, and has a wide range of application.
Effect of filler master material on properties of plastic film
Effect of filler filler on tensile properties of plastic film
The tensile properties of thin films are mainly affected by the amount of matrix resin and filler. Because the master material is surface activated, it is beneficial for the filler to disperse evenly in the extruder for a shorter time. Thus, the mechanical properties of the film can be better improved. FIG. 4 shows the influence of filling master material on tensile properties of plastic film.
Figure 4: Effect of filler matrix on tensile strength of plastic film
Figure 5: Effect of filler master material on elongation at break of plastic film
As can be seen from FIG. 4 and 5, with the increase of filler. The longitudinal and transverse tensile strength and elongation at break of the film reached the best when the amount of parent material was 10. This is because the surface of the master material is activated, the interface between the filler and the matrix resin is well bonded, and the filler particles move and deform together with the matrix resin under the action of tensile stress. The tensile strength and elongation at break of the filling system are improved when the effective cross-sectional area under external load is increased. To obtain high tensile properties of the film. The best filling base material to add 10.
Effect of filler matrix on right Angle tear strength of plastic film
FIG. 6 shows the influence of filler matrix on right-angle tear strength of plastic film.
Figure 6: Effect of filler matrix on right-angle tear strength of plastic film
As can be seen from Figure 7, the longitudinal and transverse tearing strength of plastic film without master material is significantly lower than that of plastic film with master material. With the increase of the number of parent material, the right Angle tear strength of the film reaches the maximum when the number of parent material is 10, and then decreases.
Effect of filler masterbatch on density of plastic film
FIG. 7 shows the influence of filler filler on the density of plastic film. This can be seen in Figure 7. The density of plastic film produced by pure resin is 0.92g/cm. And the density of films produced by adding the filler matrix increased. The density of the film increases with the increase of the amount of master material. This is because the resin molecules attached to the filler surface are arranged more closely than their own body by the adsorption of the filler master material surface, forming the so-called "constraint layer". The degree of molecular compactness decreases gradually as the resin moves away from the packing surface. Until the consistency with the resin body. The increase of density is beneficial to improve the mechanical properties of the plastic film, which improves the performance of the film to a certain extent, but also increases the cost of the plastic film.
Figure 7: Effect of filler masterbatch on density of plastic film
Influence of filler masterbatch on plastic film cost
The influence of filling master material on the cost of plastic film is shown in Figure 8.
Figure 8: Effect of filler masterbatch on plastic film cost
Adding a certain amount of filler matrix to blow molding film can reduce the consumption of resin in addition to changing the mechanical properties and service performance of plastic film. Cost reduction is also an important factor. However, considering the mechanical properties and performance of the film, adding 10% master material is the best.