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Nonmetal-doped titanium dioxide, preparation method thereof and degradable plastic film

A technology of titanium dioxide and plastic film, which is applied in the field of degradable plastic film, can solve the problems of plastic pollution, achieve the effects of low cost, cheap and non-toxic raw materials, and increase the utilization rate of visible light

Inactive Publication Date: 2013-11-27
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem of plastic pollution in the prior art, and provide a non-metal doped titanium dioxide that can modify the plastic film, so that the plastic film has degradability

Method used

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  • Nonmetal-doped titanium dioxide, preparation method thereof and degradable plastic film
  • Nonmetal-doped titanium dioxide, preparation method thereof and degradable plastic film
  • Nonmetal-doped titanium dioxide, preparation method thereof and degradable plastic film

Examples

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Effect test

Embodiment 1

[0030] Example 1: Adding N-TiO 2 Photooxidation-Biodegradation of Composite Thin Films

[0031] S1. Nitrogen-doped titanium dioxide (N-TiO 2 ) powder preparation: add 6.0g nano-titanium dioxide, 0.6g hexamethylenetetramine (or urea, ammonium carbonate and other nitrogen sources), 4 large stainless steel balls, and 20 small stainless steel balls in a stainless steel grinding jar. Seal it well. On a planetary ball mill (or other ball mill), the speed is 300~400 rpm, ball mill for 1~4 hours, take out the ground powder, grind it finely, put it into a crucible, and in a muffle furnace, 400~ Calcined at 500°C for 1 to 2 hours to obtain nitrogen-doped titanium dioxide (N-TiO 2 )powder. Determination of the properties of nitrogen-doped titanium dioxide, the results show that N-TiO 2 The absorption band edge of the undoped titanium dioxide is obviously red-shifted, and in the ultraviolet and visible parts of N-TiO 2 The absorption spectrum of the titanium dioxide is stronger than ...

Embodiment 2

[0033] Example 2: Adding S-TiO 2 or C-TiO 2 Photooxidation-Biodegradation of Composite Thin Films

[0034] S1. Sulfur-doped titanium dioxide (S-TiO 2 ) or carbon-doped titanium dioxide (C-TiO 2 ) powder preparation: the same as step S1 of the above-mentioned embodiment 1, but the doping source is adjusted, the sulfur source is thiourea, elemental sulfur, etc., and the carbon source is carbon tetrachloride, xylene and other hydrocarbon compounds. Prepared S-TiO 2 and C-TiO 2 catalyst powder. The analysis shows that, like the photocatalysts prepared in Example 1, their absorption band edges are all more red-shifted than those of undoped titanium dioxide, and in the ultraviolet and visible parts S-TiO 2 and C-TiO 2 The absorption spectrum of the titanium dioxide is stronger than that of undoped titanium dioxide, and it has the activity of degrading the film under ultraviolet and visible light. The results are shown in figure 1 .

[0035] S2. is the same as step S2 of the...

Embodiment 3

[0038] Embodiment 3: adding different S-TiO 2 Photooxidation-Biodegradation of Mass Ratio Composite Thin Films

[0039] S1. Sulfur-doped titanium dioxide (S-TiO 2 ) powder preparation: the same as step S1 of the above-mentioned embodiment 2, the doping source is thiourea, and S-TiO 2 catalyst powder.

[0040] S2. Same as step S2 of the above-mentioned embodiment 1, but adjust S-TiO 2 The proportions of powder and LDPE resin were 1%, 2% and 3%, respectively, to obtain LDPE / 1%S-TiO 2 、LDPE / 2%S-TiO 2 、LDPE / 3%S-TiO 2 Composite film. Studies have shown that after 300 hours of UV light, LDPE / 1%S-TiO 2 、LDPE / 2%S-TiO 2 、LDPE / 3%S-TiO 2 The weight of the composite film is reduced by 34%, 40%, and 45% respectively.

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Abstract

The invention discloses nonmetal-doped titanium dioxide, a preparation method thereof and degradable plastic film. The nonmetal-doped titanium dioxide is prepared by high-energy ball milling of nano titanium dioxide and a nonmetal doping source, wherein the weight of the nonmetal element is 0.1%-5.0% of the weight of the titanium element. The degradable plastic film can be prepared by subjecting the nonmetal-doped titanium dioxide and a polyolefin resin to belt blending and extrusion-blown molding, wherein the weight of the nonmetal-doped titanium dioxide is 0.1%-10.0% of the weight of the polyolefin resin. The nonmetal-doped titanium dioxide has characteristics of simple production technology, easily available raw materials, high photocatalytic activity, wide light absorption range, and the like. The degradable plastic film prepared by the nonmetal-doped titanium dioxide has characteristics of short degradation time, controllable stable periods, wide application range, and the like.

Description

technical field [0001] The invention relates to the technical field of degradable plastic films, and more specifically relates to a non-metal doped titanium dioxide, a preparation method thereof, and a degradable plastic film. Background technique [0002] With the increasing severity of "white pollution", people are constantly looking for effective solutions to the problem. After continuous efforts, various degradable plastics have come out one after another. Currently, the most effective and economical degradation technology should be oxidative-biodegradation. Oxo-biodegradation consists of two stages: the first stage of oxidative breakdown and the second stage of biodegradation. Moreover, the speed of the biodegradation process depends on the stage of oxidative cracking induced by pro-oxidants. These added pro-oxidants can promote the oxidation reaction between the polymer and the oxygen in the air under the action of light and heat to break the polymer chain, making the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/00C08K3/22C08L23/06C08L23/12C08L25/06C08L27/06
Inventor 罗颖梁文耀宋霜霜禹筱元董先明
Owner SOUTH CHINA AGRI UNIV
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