Method for preparing super-tough and high rigidity polystyrene nano composite material
A technology of polystyrene nano- and nano-composite materials, which is applied in the field of preparing super-tough and high-rigidity polystyrene nano-composite materials, which can solve the problems of large dispersed phase size and achieve the effects of small impact, simple equipment and high production efficiency
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Embodiment 1
[0023] First, 100 parts of Na-montmorillonite was stirred in 1000 parts of water at high speed for 2 hours to form a stable suspension system. Then 30 parts of cetyltrimethylammonium bromide were added to the suspension and stirring was continued for 2 hours. After the ion exchange reaction was completed, the suspension was allowed to stand for 24 hours to fully precipitate, and the supernatant was removed to obtain a sludge-like mixture, and then 40 parts of bisphenol A type epoxy resin ARALDITEGY240 (manufactured by CIBA-GEIGY company, molecular weight 340-380, Epoxy value 0.52-0.56) was added into the muddy mixture and stirred thoroughly for 2 hours. Finally, it is dehydrated and dried, and the product is crushed to a particle size of 200-400 meshes to obtain a co-intercalation organic montmorillonite.
[0024] On a twin-screw extruder with a diameter of 30 mm, 0.5 parts of co-intercalated organic montmorillonite and 100 parts of polystyrene (brand name 666D, injection mol...
Embodiment 2—3
[0026] Same as Example 1, wherein the content of co-intercalated organic montmorillonite is 1 part and 5 parts respectively, and its mechanical properties are shown in Table 1.
[0027] Table 1 Mechanical properties of polystyrene / co-intercalation organic montmorillonite binary nanocomposites
[0028]
[0029] From the above results, it can be known that the addition of a small amount of co-intercalated organic montmorillonite can significantly improve the stiffness and strength of the polystyrene matrix. For example, adding 2% co-intercalated organic montmorillonite can increase the tensile strength, flexural strength and flexural modulus of polystyrene by about 10%, while the elongation at break and notched impact strength remain basically unchanged. However, with the increase of nano-filler content, the toughness of the matrix will decrease. When 5% co-intercalated organic montmorillonite is added, the notched impact strength and elongation at break of polystyrene will d...
Embodiment 4
[0031] On a twin-screw extruder with a diameter of 30 mm, 6 parts of SBS (the trade mark is 4303, manufactured by Beijing Yanshan Petrochemical), 3 parts of POE-g-MAH (POE grafted maleic anhydride, maleic anhydride grafting rate 1wt %, manufactured by Shanghai Rizhisheng) and 100 parts of polystyrene are co-melted and extruded to granulate, the temperature of the four-stage heating zone from the feed inlet to the extruder head is 180, 200, 200 and 190 ° C, and the screw speed is 180RPM. The mechanical properties of the obtained products are shown in Table 2.
[0032] As a comparison, the mechanical properties of 100 parts of polystyrene and 6 parts of SBS, and 100 parts of polystyrene and 9 parts of SBS are also listed in Table 2.
[0033] Table 2 Mechanical properties of polystyrene / synergistic toughening system composites
[0034]
[0035] The above results show that, as a widely used toughening agent, the addition of SBS can increase the impact strength and elongation ...
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