Fiber/Polypropylene Resin Composite Foamed Particles and Its Application
A polypropylene-based resin and composite foaming technology, which is applied in the field of foaming materials, can solve the problems of rough surface of foamed moldings, high molding pressure, and affecting the steam molding process, and achieve high rigidity and excellent fusion.
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preparation example Construction
[0026] The preparation of above-mentioned multilayer resin particle can adopt following method:
[0027]When the material of the cortex is polypropylene resin, the polypropylene resin is added into the extruder, and while the melt is extruded from the die of the extruder, the fibers are passed through the outer wall of the die in the form of bundles or strands. Enter the inside of the discharge hole of the die, and pull continuously along the central axis of the discharge hole of the die. After the fiber is infiltrated by the melt, it is co-extruded with the melt in a linear form to form a strip of melt-coated fiber. The strips are cooled and pelletized to obtain multi-layered resin particles. In order to improve the efficiency, it is preferable to use a multi-hole die, and each discharge hole of the multi-hole die is equipped with bundled or twisted fibers;
[0028] When the material of the skin layer is a mixture of polypropylene-based resin and additives, the polypropylene...
Embodiment 1-12
[0035] Preparation of fiber / polypropylene resin composite expanded particles:
[0036] Step 1. According to the composition and ratio in Table 1, add polypropylene resin to the extruder, pass the fiber through the outer wall of the die into the discharge hole of the die, and pull it continuously along the central axis of the discharge hole of the die After the fiber is infiltrated by the melt, it is co-extruded together with the molten resin in a linear form, cooled and pelletized to obtain multilayer resin particles with a diameter of 1mm, a length of 1.8mm, and an average weight of 1.8mg;
[0037] Step 2, in the autoclave of 5L, add 100 weight parts (1000g) above-mentioned multi-layer resin particle, 300 weight parts water, 0.05 weight part sodium dodecylbenzene sulfonate, 0.3 weight part kaolin and carbon dioxide (charged carbon dioxide Ensure that the pressure in the autoclave at the foaming temperature is 6MPa), heat up to a temperature 5°C lower than the foaming temperat...
reference example 1-3
[0043] Preparation of polypropylene-based resin monolayer foamed particles:
[0044] Step 1. According to the composition and proportion in Table 1, add polypropylene resin to the extruder, melt and extrude, cool, and pelletize to obtain a single layer with a diameter of 1mm, a length of 1.8mm, and an average weight of 1.8mg resin pellets;
[0045] Step 2, using the same method as Step 2 in Examples 1-12 to obtain single-layer expanded particles.
[0046] The single-layer expanded particles obtained in Reference Examples 1-3 were washed with water, centrifuged, and maintained at atmospheric pressure for 24 hours, and then the apparent density of the single-layer expanded particles was measured. The results are shown in Table 1.
[0047] Application of the above-mentioned single-layer expanded particles: the expanded molded body obtained by the same method as in Examples 1-12.
[0048] The compressive strength and appearance of the foamed molded articles obtained in Reference...
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