A kind of preparation method of plant fiber-based foaming thermoplastic masterbatch
A technology of plant fiber and foaming heat, which is applied in the field of preparation of natural plant fiber-based foaming thermoplastic masterbatch, can solve the problems of degradation of lignocellulosic materials, affect product quality, and decrease in mechanical strength, and achieve the improvement of mechanical properties and Improvement of plasticizing efficiency and hot-melt fluidity
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Embodiment 1
[0035] Step 1), after mixing 100g of dried plant fiber (in this example, rice straw crushed to 20 meshes) and 200ml of lye swelling agent (sodium hydroxide solution with a concentration of 5%), place it at -10°C Immerse in the environment for 45min, and then move into an ultrasonic reactor with an ultrasonic frequency of 22kHz, with a working pressure of 2Mpa (in specific implementation, the working pressure can be selected within the range of 2-6MPa according to the actual situation), the stirring speed is 100rpm, and the ultrasonic reaction is 5min (the specific implementation During the process, the reaction time can also be selected according to the actual situation (5-40min); Drain the natural plant fiber powder and dry it at 103±2°C to obtain alkalized plant fiber powder (NaO-Wd);
[0036] Put 100g NaO-Wd and 100g modified plasticizer (obtained by mixing lauroyl chloride, benzyl chloride and maleic anhydride with a mass ratio of 5:4:1 in turn) in a double-layer glass reac...
Embodiment 2
[0045] Step 1) Mix 100g dry and crushed wheat straw powder to 80 mesh with 250ml potassium hydroxide solution with a concentration of 30%, place it at -10°C for 45min, and then move it into an ultrasonic reactor with an ultrasonic frequency of 22kHz and a working pressure of 6MPa, stirring Rotate at 100rpm, sonicate for 40 minutes, drain the natural plant fiber powder, and dry it at 103±2°C to obtain alkalized plant fiber powder (NaO-Wd);
[0046] Put 100g NaO-Wd and 250g modified plasticizer (obtained by mixing lauroyl chloride, benzyl chloride and maleic anhydride with a mass ratio of 5:2:3 in turn) in a double-layer glass reactor. ℃ / min, heat up to 100°C, react for 90 minutes, cool down to 45°C naturally, filter with suction and wash the filter residue alternately with water and ethanol until the eluate is neutral, place the filter residue at 73°C for 24 hours in vacuum to obtain Plasticized natural plant fiber powder (ArO-Wd).
[0047] Step 2), 300g ArO-Wd, 100g polypropy...
Embodiment 3
[0054] Step 2) in Example 2 was adjusted to 400g ArO-Wd, 100g polypropylene, 2.5g foaming agent (azodicarbonamide: sodium bicarbonate: zinc oxide = 1:1:0.5), 3g calcium-zinc composite stabilizer Place the agent, 5g titanium dioxide, 5g nano-calcium carbonate, and 5g coloring agent in a high-speed mixer, heat mix at 100°C for 8 minutes, stir evenly, cool to 45°C, and discharge them into the feeder to obtain a foamable thermoplastic mixture. material. Other steps are the same as in Example 2), and the temperature setting of the extruder is shown in Table 1. The prepared natural plant fiber-based foamed thermoplastic masterbatch is marked as C.
[0055] Examples 2 and 3 prepared natural plant fiber-based foamed thermoplastic masterbatches, using a φ65 / 132 conical twin-screw extruder, heating temperature and other main parameters are shown in Table 1.
[0056] The performance testing data of natural plant fiber-based foamed thermoplastic masterbatch are shown in Table 2:
[0057...
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