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Preparation method of sunlight photocatalysis degradation agricultural thin film

An agricultural film and photocatalytic technology, which is applied in the field of solar photocatalytic degradation of agricultural film, can solve the problems of difficult to meet the needs of different fields, the degradation rate is not controllable, and the dependence of photodegradable plastics is large, so as to achieve degradation Controllable rate, low cost, and reduced dependency

Active Publication Date: 2007-03-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main disadvantages of this method are: the photodegradable plastics obtained are too dependent on ultraviolet light, and the degradation efficiency under sunlight is low; the degradation rate of the photodegradable plastics prepared by this method is not controllable, Difficult to meet the needs of different fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve rhodamine B in ethanol to make a solution of 0.001g / ml, and add it dropwise to the nano-TiO 2 (Particle diameter is 15nm, anatase type) in the water dispersion liquid, continue to stir 30min after dropwise adding, then filter, wash, dry, make the nano-TiO of Rhodamine B sensitization 2 catalyst of light. The photocatalyst and LDPE resin (MI=1.0g / 10min) are blended and granulated in a twin-screw extruder to obtain a photocatalyst content of 20wt% photocatalytic polyethylene masterbatch, and then mixed with LDPE resin (MI=1.0g / 10min) 10 min) blending and blown film to prepare solar photocatalytic degradation agricultural films with photocatalyst contents of 0.5wt%, 1wt%, and 2wt%, respectively, with controllable degradation rates.

[0021] The thickness of the obtained solar photocatalytic degradation agricultural film is about 10 μm, and it is cut into 5×5cm 2 The square sample was subjected to sunlight photocatalytic degradation test. Studies have shown that...

Embodiment 2

[0023] Dissolve eosin in ethanol to make a solution of 0.002g / ml, and add it dropwise to the nano-TiO 2 (Particle size is 50nm, anatase type) ethanol dispersion liquid, continue to stir 45min after dropwise addition, then filter, wash, dry, obtain the nano-TiO of eosin sensitization 2 catalyst of light. The photocatalyst and LDPE resin (MI=2.0g / 10min) are blended and granulated in a twin-screw extruder to obtain a photocatalyst polyethylene master batch with a photocatalyst content of 30wt%, and then mixed with LDPE resin (MI=2.0g / 10min) 10 min) blending and blown film to prepare solar photocatalytic degradation agricultural films with photocatalyst contents of 0.5wt%, 1wt%, and 2wt%, respectively, with controllable degradation rates.

[0024] The thickness of the obtained solar photocatalytic degradation agricultural film is about 20 μm, and it is cut into 5×5cm 2 The square sample was subjected to sunlight photocatalytic degradation test. Studies have shown that at room t...

Embodiment 3

[0026] Dissolve phthalocyanine blue in ethanol to make a solution of 0.003g / ml, and add it dropwise to the high-speed stirring nano-TiO 2 (Particle diameter is 25nm, anatase type) ethanol dispersion liquid, continue to stir 60min after dropping, then filter, wash, dry, make the nano-TiO of phthalocyanine blue sensitization 2 catalyst of light. The photocatalyst and LDPE resin (MI=2.5g / 10min) are blended and pelletized in a twin-screw extruder to obtain a photocatalyst content of 30wt% photocatalytic polyethylene masterbatch, and then mixed with LDPE resin (MI=2.5g / 10min) 10 min) blending and blown film to prepare solar photocatalytic degradation agricultural films with photocatalyst contents of 0.5wt%, 1wt%, and 2wt%, respectively, with controllable degradation rates.

[0027]The thickness of the obtained solar photocatalytic degradation agricultural film is about 25 μm, and it is cut into 5×5cm 2 The square sample was subjected to sunlight photocatalytic degradation test. ...

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Abstract

The present invention relates to preparation process of sunlight catalyzed degradable farm film. Organic photosensitizer sensitized nanometer TiO2 as the catalyst is mixed polyethylene resin in a double screw extruder to prepare photocatalytic polyethylene agglomerate containing photocatalyst in 20-40 wt%. The polyethylene agglomerate is then mixed with polyethylene resin and blown to prepare the sunlight catalyzed degradable farm film of 8-40 micron thickness and with photocatalyst content of 0.1-10 wt%. The sunlight catalyzed degradable farm film has simple preparation process, low cost, high efficiency photocatalytic degradation in controllable degradation rate, and effectively lowered harm to environment.

Description

technical field [0001] The invention relates to a preparation method for solar photocatalytic degradation of an agricultural film, belonging to the field of chemistry and chemical engineering. Background technique [0002] The application of agricultural film has greatly promoted the development of agriculture in our country. At the same time, it has also brought serious pollution problems to the soil. Polyethylene molecules are symmetrical and stable, have good strength, and are difficult to degrade under natural conditions. The polyethylene film remaining in the soil is difficult to recycle, which has a negative impact on soil arability and aeration, and long-term accumulation leads to a decrease in crop yield. Solving the degradation problem of polyethylene agricultural film has become a top priority. [0003] Existing degradation technologies mainly include photodegradation technology, biodegradation technology, and photo / biological dual degradation technology. Photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K3/22C08J5/18B29C49/00
Inventor 施利毅张剑平朱焕扬
Owner SHANGHAI UNIV
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