Biodegradable composite foamed plastic and preparation method
A syntactic foam, biodegradable technology, applied in the field of syntactic foam, the preparation of the plastic, can solve the problems of poor interface compatibility, low melt strength, difficult processing methods, etc., to achieve low cost, interface compatibility Good, simple and easy process effect
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[0020] The preparation method of the biodegradable syntactic foam of the present invention is specifically implemented according to the following steps:
[0021] Step 1: Weigh 2%-30% hemp fiber, 0.2%-2% foaming agent, 0.02%-0.5% foaming aid, 0.3%-1.0% mold release agent, 1% ~2% surface treatment agent, the balance is polylactic acid masterbatch, the sum of the mass percentages of each component is 100%;
[0022] Step 2: Surface treatment of hemp fiber. Dry the hemp fiber weighed in the previous step in a drying oven at 105°C for 6 hours, take it out and put it into the surface treatment agent weighed in the previous step. The treatment time is 1h to 4h, and then the treated Put the hemp fiber into a drying oven at 105°C to dry for 6 hours, take it out and cool it to room temperature;
[0023] Step 3: Mix the treated hemp fiber obtained in step 2 with polylactic acid masterbatch, foaming agent, foaming aid, and mold release agent, and place it in an oven at 168°C to 190°C for ...
Embodiment 1
[0029] First, apply simethicone or MAXI type silicone grease evenly on the inner surface of the foam molding mold, subject to the formation of a film, and the dosage does not account for the total share of the syntactic foam. Soak 2 parts of hemp fiber in NaOH solution with concentration of 8% and temperature of 120°C for 60min, take it out, wash it with warm water for several times, and dry it in an oven at 105°C for 6h. Then, the treated hemp fiber of 1 mm was uniformly mixed with 0.2 part of AC foaming agent, 0.06 part of zinc oxide, and 97.74 parts of PLA in a mixer. Finally, foam molding was performed in an oven at 168° C. for 10 minutes and a pressure of 5 MPa to obtain biodegradable foamed plastics. The density of the obtained foamed plastics is: 0.71g / cm 3 , The mechanical properties are characterized by: bending strength 18.97MPa, tensile strength 4.76MPa, elongation at break 6.71%. Biodegradation test, can be completely degraded.
Embodiment 2
[0031] First, apply simethicone or MAXI type silicone grease evenly on the inner surface of the foam molding mold, subject to the formation of a film, and the dosage does not account for the total share of the syntactic foam. Soak 8 parts of ramie fibers in a stearic acid solution with a concentration of 8% and a temperature of 120°C for 60 minutes, wash them with warm water several times after taking them out, and dry them in an oven at 105°C for 6 hours. Then the treated 2mm ramie fiber was uniformly mixed with 0.4 part of AC foaming agent, 0.12 part of zinc oxide and 91.48 part of PLA in a kneader. Finally, foam molding was performed in an oven at 168° C. for 15 minutes and a pressure of 5 MPa to obtain biodegradable foamed plastics. The density of the obtained foamed plastics is: 0.64g / cm 3 , The mechanical properties are characterized by: bending strength 11.56MPa, tensile strength 3.46MPa, elongation at break 10.92%. Biodegradation test, can be completely degraded.
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