Polyester fully biodegradable mulch
A biodegradable, polyester technology, applied in the direction of plant protection cover, etc., can solve the problems of difficult production method, difficult to popularize in a large area, poor transparency, etc., and achieves low water vapor transmission rate, good transparency, and good flexibility. Effect
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Embodiment 1
[0041] Mix 40% PBST (melting point 110-120°C, melting index: 3.8), 55% PLA (melting point 160-170°C, melting index: 4.0), 0.5% 2,2′-bis(2-oxazoline), 1 % hydrotalcite (3000 mesh), 1% sodium hydroxymethyl cellulose, 1.5% anti-aging agent [0.5% compound antioxidant (1010 and 168), 0.5% ultraviolet absorber UV-328, 0.5% light stabilizer 622], 0.5% slip agent (0.3% N, N-ethylene bis stearamide, 0.2% oleic acid amide), 0.5% silicon dioxide (10000 mesh), sequentially added to the high-speed mixer, after mixing evenly , added to the parallel twin-screw extruder with an aspect ratio of 48, further plasticized, extruded and granulated to obtain a completely biodegradable film material, and then further blown into a film with a thickness of 0.01mm and a water vapor transmission rate of 13.2g / m 2 *d, the temperature of the soil at a depth of 10cm is 14.9°C 24 hours after filming.
Embodiment 2
[0043] Mix 80% PBS (melting point: 110-120°C, melting index: 5.0), 10% PGA (melting point: 170-180°C, melting index: 4.5), 1.5% 2,2'-(1,3-phenylene) -Bisoxazoline, 2% mica powder (5000 mesh), 2% sodium hydroxypropyl methylcellulose, 0.5% anti-aging agent [0.2% compound antioxidant (1024 and 626), 0.2% ultraviolet absorber UV-P, 0.1% light stabilizer 770], 1% slip agent (0.5% erucamide and 0.5% oxidized PE wax), 3% talcum powder (1000 mesh), add to the high-speed mixer in turn, mix well Finally, add it to a parallel twin-screw extruder with an aspect ratio of 48 to further plasticize, extrude and granulate to obtain a completely biodegradable film material, and then further blown the film with a thickness of 0.01mm and a water vapor transmission rate of 9.8g / m 2 *d, the temperature of the soil at a depth of 10cm is 17.4°C 24 hours after filming.
Embodiment 3
[0045] Mix 70% PBSA (melting point: 100-110°C, melting index: 2.8), 22% PHBV (melting point: 165-175°C, melting index: 5.3), 1% 4,4-dimethyloxazoline, 1.5% Mongolian Soil removal (10000 mesh), 1.5% sodium carboxymethyl cellulose, 1% anti-aging agent [0.4% compound antioxidant (1076 and 168), 0.3% ultraviolet absorber UV-9, 0.3% light stabilizer 944 ], 0.8% slip agent (0.3% zinc stearate and 0.5% PE wax), 2.2% calcium carbonate (5000 mesh), add to the high-speed mixer in turn, after mixing evenly, add to the aspect ratio 48 Further plasticizing, extruding and granulating in the parallel twin-screw extruder to obtain a completely biodegradable film material, and then further blown the film, with a thickness of 0.01mm and a water vapor transmission rate of 11.9g / m 2 *d, the soil temperature at 10cm deep is 15.4°C 24 hours after the film was spread.
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