Polymer nanocomposite masterbatch, polymer nanocomposite and methods for preparation thereof
A technology of nanocomposite materials and polymers, applied in the field of preparing polymer nanocomposite masterbatches
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Embodiment 1
[0070] Example 1 Preparation of triethoxy (octyl) silane modified nanoclay masterbatch (clay-MB) by solution mixing method
[0071] Clay (Closite 20 from Southern Clay Products) (2 g) was stirred in xylene (40 ml) by a magnetic stirrer for 3 hours to embed the clay layer. Then, the embedded clay / xylene suspensions were sonicated for 30 min, highly dispersed by homogenization at 8,000 rpm for 15 min, and then stirred overnight at room temperature, respectively. Select triethoxy (octyl) silane to homogenize the clay / xylene suspension for 15 minutes, add 0.2ml of triethoxy (octyl) silane to the clay / xylene suspension, and heat at 80°C for 4 hours, homogenize for 15 minutes, and then stir overnight at room temperature to modify the clay surface. Observation of the dispersion of triethoxy(octyl)silane-modified clay in xylene by TEM technique shows the single platelet alignment of the clay layer and the stacking of the clay in a certain area, as figure 1 shown.
[0072] Nanoclay ...
Embodiment 2
[0074] Example 2 demonstrates the preparation and properties of clay-MB / PP nanocomposites and normal clay / PP composites.
[0075] The components shown in Table 1 were mixed on a 40 mm Leistriz co-rotating twin screw extruder. The extrusion conditions are: cylinder temperature 190°C, screw speed 250rpm, output 5kg / h. The performance evaluation is shown in Table 2.
[0076] Table 1
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[0078] 1 Compatibilizers are oligomers or polymers functionalized with polar groups such as amines or carboxylic acids and derivatives.
[0079] Table 2 Properties of clay-MB / PP nanocomposites and common clay / PP composites
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[0082] As shown in Table 2, clay-MB / PP nanocomposites have higher yield tensile, elongation at break, flexural modulus, and flexural strength than ordinary clay / PP composites.
[0083] To illustrate the mechanical properties of the composites, the dispersion of clay in both systems was studied by TEM technique. image 3 with Figure 4 T...
Embodiment 3
[0084] Example 3 demonstrates the effect of the drying method of the clay-MB on the dispersibility of the clay in the polymer matrix.
[0085] Clay-MB / PP masterbatch suspensions were dried using two different drying methods: solvent evaporation and precipitation. Using the solvent evaporation method, the clay-MB / PP masterbatch suspension was evaporated at room temperature, then dried and ground to obtain clay-MB / PP nanocomposites (evaporated). The precipitation method is described in Example 1 to obtain clay-MB / PP nanocomposites (precipitation). The results show that the drying method shows different dispersion properties of the nanoclay in the polymer matrix as observed with SEM and TEM techniques. Such as Figure 5, SEM images showed that good bonding of clay and polymer matrix was observed in both techniques, but the morphology of the clay masterbatch was different between the two techniques. In the case of the evaporation method, the morphology of the clay masterbatch s...
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