Full-degradable weeding mulching film and preparation method thereof
A technology of weeding mulch and full degradation, which is applied in the field of degradable composite materials, can solve the problems of slow degradation of mulch film, great impact on the environment and crops, and low utilization of papermaking waste, so as to achieve inhibition of germination and growth, soil protection and promotion, The effect of protecting the environment
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[0040] The present invention also provides a preparation method of bio-based weeding mulch film, which specifically includes the following steps:
[0041]Step 1, mixing the biodegradable resin, starch, calcium carbonate, additives, and post-emergence herbicide evenly, adding to the silo of a co-rotating twin-screw extruder, extruding and granulating to obtain PBAT-starch masterbatch;
[0042] In step 2, the biodegradable resin, papermaking waste, calcium carbonate, additives, and herbicide sealant are mixed uniformly, added to the silo of a co-rotating twin-screw extruder, extruded and granulated to obtain PBAT—papermaking waste masterbatch;
[0043] In step 3, the two groups of masterbatches are co-extruded and blown into film to obtain the bio-based weed-controlling mulch film.
[0044] Wherein, the mixing time of step 1 is 20min-700min, preferably 80-500min, more preferably 100-300min; mixing speed is 10-4000rpm, preferably 300-3000rpm, more preferably 400- 1000rpm; the mi...
Embodiment 1
[0049] 1. Preparation of PBAT-starch masterbatch
[0050] See Table 1 for the types and amounts of each component in the raw material composition of the outer film. The particle size of starch is 1000-1500 mesh.
[0051] Add the raw material composition into a high-speed blender and mix, the mixing temperature is 115°C, the mixing speed is 300rpm, and the mixing time is 90min, and the primary mixture 1 is obtained;
[0052] Place the above-mentioned primary mixture 1 in a twin-screw extruder to extrude, plasticize, and granulate to obtain master batches; the temperatures from the first zone to the sixth zone of the twin-screw extruder are 100°C, 120°C, and 140°C, respectively , 162°C, 165°C and 165°C; the head temperature of the twin-screw extruder is 165°C, and the screw speed is 300rpm.
[0053] 2. Preparation of PBAT—papermaking waste masterbatch
[0054] See Table 1 for the types and amounts of each component in the raw material composition of the inner film. The paper...
Embodiment 2
[0062] 1. Preparation of PBAT-starch masterbatch
[0063] See Table 2 for the types and amounts of each component in the raw material composition of the outer film. The particle size of starch is 600-1200 mesh.
[0064] The raw material composition is added into a high-speed blender and mixed, the mixing temperature is 100°C, the mixing speed is 100rpm, and the mixing time is 100min, and the primary mixture 1 is obtained;
[0065] Place the above-mentioned primary mixture 1 in a twin-screw extruder to extrude, plasticize, and granulate to obtain master batches; the temperatures from the first zone to the sixth zone of the twin-screw extruder are 90°C, 135°C, and 160°C, respectively , 165°C, 170°C and 170°C; the head temperature of the twin-screw extruder is 170°C, and the screw speed is 220rpm.
[0066] 2. Preparation of PBAT—papermaking waste masterbatch
[0067] See Table 1 for the types and amounts of each component in the raw material composition of the inner film. Pap...
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