Efficient controllable photooxidation-biodegradable plastic film and preparation method thereof
A plastic film and biodegradation technology, applied in the field of high-efficiency controllable photooxidation-biodegradable plastic film and its preparation, can solve the problems of uncontrollable degradation, incomplete degradation, complicated process, etc., and achieve the promotion of photocatalytic degradation and degradation efficiency The effect of improving and increasing the degree of degradation
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[0039] (2) The preparation methods of the plastic films of the Examples and Comparative Examples are as follows:
[0040] According to the weighing principle of each embodiment or comparative example in Table 1, it is mixed in a high-speed mixer for use. Extruder conditions: Zone 1 100~120℃, Zone 2 120~140℃, Zone 3 140~160℃, Zone 4 160~180℃, Zone 5 165~185℃, die head 165~185℃. After the temperature is stable, add the mixed raw materials into the feeding hopper, adjust the speed of the main machine and the feeder, melt and extrude the raw materials, pass water, blow dry, cut into master batches, and then dry the master batches for use. Then set the temperature of the film blowing machine: 100~110℃ in the first zone, 125~135℃ in the second zone, 145~155℃ in the third zone, and 145~155℃ in the die. After the temperature is stable, turn on the switch of the host, adjust the speed, add the masterbatch, and extrude and blow the film into a film with a thickness of about 80 microns.
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Example Embodiment
[0050] Examples 6-9 adding different content of nano TiO 2 The high-efficiency and controllable photo-oxidation-biodegradable plastic film, the photo-oxidation-biodegradable plastic film under light has an induction period. Example 6 Nano-TiO 2 The minimum content, the longest induction period is 250 hours, due to nano-TiO 2 As the content increases, the degradation rate increases, and the corresponding induction period is shortened to 180 hours in Example 9. The induction period does not disappear, and the degradation of the plastic film remains controllable. The degradation test results also show that nano-TiO 2 When the content is low, increase TiO 2 Content, the degradation effect is obvious, after more than 3%, increase TiO 2 Content, the degradation effect is not obvious.
[0051] 4. Examples 10-13 are highly efficient and controllable photo-oxidation-biodegradable plastic films added with different types of hydrophilic modifiers
[0052] In Examples 10-13, high-efficiency con...
Example
[0059] 8. Examples 29-32 Typical high-efficiency controllable photo-oxidation-biodegradable plastic film
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