Environmentally-friendly controllable degradation agricultural film and preparation method thereof
An agricultural mulch film, an environmentally friendly technology, applied in the field of environment-friendly controllable degradable agricultural mulch film and its preparation, can solve the problems of affecting the film degradation rate, the decrease of film mechanical properties, and the high cost of film, and achieve fully controllable photocatalysis-biodegradation , to avoid the decline of mechanical properties and improve the effect of degradation rate
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Embodiment 1
[0044] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of 50 ± 15m) with a particle size of 20-30nm 2 / g, wherein the content of anatase nano-titanium dioxide is 80%) 50 parts are put into the ultra-high-speed mixer, and stirred for 20 minutes at 4000 rpm, during which 1 part of γ-aminopropylmethyldiethoxy The mixture of silane and 80 parts of absolute ethanol is added in two times. After the addition, continue to stir and mix at ultra-high speed for 1.5 hours, then filter with suction, dry the powder at 120°C, and put it into a ball mill for grinding for at least 1 hour.
[0045] 0.2 parts of the obtained surface-modified nano additives and 5 parts of polyoxyethylene polyoxypropylene ether block copolymers with a relative molecular weight of 1000 g / mol, 10 parts of acetyl tri-n-butyl citrate and triethyl citrate 5 parts of esters were dispersed by colloid mill for 2 hours, and then mixed with 75 parts of corn starch...
Embodiment 2
[0048] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of 50 ± 15m) with a particle size of 20-30nm 2 / g, the content of anatase nano-titanium dioxide is 80%) 30 parts are put into the ultra-high speed mixer, stir 30 minutes under 3000 revs / min, wherein 0.5 part of γ-aminopropyl methyldiethoxysilane Add the mixed liquid with 50 parts of absolute ethanol in 3 times. After the addition, continue to stir and mix at ultra-high speed for 2 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.
[0049] 5 parts of polyoxyethylene polyoxypropylene ether block copolymer and 15 parts of triethyl citrate are dispersed 1 hour by colloid mill after the obtained surface-modified nano-auxiliary 1 part and relative molecular weight are 1500g / mol, then With 40 parts of rice starch, 40 parts of mung bean starch, 10 parts of polyvinyl alcohol of 1799, and 1 part of 2,2'-...
Embodiment 3
[0052] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of 50 ± 15m) with a particle size of 20-30nm 2 / g, the content of anatase nano-titanium dioxide is 80%) 30 parts are put into the ultra-high-speed mixer, stirred for 10 minutes at 5000 rpm, during which 1.5 parts of γ-aminopropylmethyldiethoxysilane Add the mixed solution with 100 parts of absolute ethanol in 3 times. After the addition, continue to stir and mix at ultra-high speed for 1.5 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.
[0053] 5 parts of polyoxyethylene polyoxypropylene ether block copolymers and 10 parts of acetyl tri-n-butyl citrate are dispersed by colloid mill for 1.5 parts of nano-auxiliaries obtained after surface modification and relative molecular weight of 4000g / mol hour, then with 30 parts of lotus root starch, 42 parts of potato starch, 20 parts of polyvinyl alcoh...
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