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Light degradation of polyvinyl chloride resin

A technology of polyvinyl chloride resin and polyvinyl chloride, which is applied in the field of modified polyvinyl chloride resin, and can solve the problems of plastic products’ applicability, poor light transmittance, and unsatisfactory photocatalytic degradation effect, etc.

Inactive Publication Date: 2008-07-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of titanium dioxide nanoparticles is very polar, and the refractive index difference between them and plastic materials is very large. Therefore, the product obtained by directly mixing titanium dioxide nanoparticles and plastic products is not only photocatalytic due to poor compatibility. The degradation effect is not ideal, and the light transmittance is extremely poor, which has a great impact on the applicability of plastic products

Method used

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  • Light degradation of polyvinyl chloride resin
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Examples

Experimental program
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Effect test

preparation example Construction

[0012] (1) Modified TiO 2 Preparation of nanopowder:

[0013] Titanium dioxide (TiO 2 ) nanoparticles (TiO 2 Particle size is less than 100nm) uniformly dispersed in water or organic solvent, then add silane coupling agent (compound shown in formula I), the addition of silane coupling agent is TiO 2 1% to 20% of the weight of nanoparticles, stirred at 5°C to 80°C for 1 to 24 hours, filtered to obtain modified nano TiO 2 ;

[0014] Wherein said organic solvent is C 1 ~C 6 Aliphatic monohydric alcohol (such as methanol, ethanol, propanol, isopropanol or butanol, etc.), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), hexane, cyclohexane, toluene or xylene.

[0015] (2) Preparation of the target object:

[0016] Polyvinyl chloride (raw material) with a degree of polymerization of 1700 to 2500 is dissolved in tetrahydrofuran, and then the modified nano-TiO prepared by step (1) is added 2 , modified nano-TiO 2 The weight ratio with polyvinyl chloride (raw material)...

Embodiment 1

[0021] Commercially available P25 nanometer TiO 2 Put it in a container filled with deionized water, add vinyl tris (2-methoxyethoxy) silane (Z-6172) as a modifier after fully dispersing, and control the amount of TiO 2 1% of the added amount, stirred at 20°C for 12 hours, filtered, and dried to obtain modified TiO 2 solid powder. Add 2.0 grams of polyvinyl chloride plastic particles to 60 milliliters of tetrahydrofuran and stir until fully dissolved; then add 0.1 grams of modified TiO2 to the solution 2 Nano-powder, after stirring for 8 hours, tetrahydrofuran was allowed to volatilize naturally at room temperature to obtain photocatalytic self-decomposing polyvinyl chloride plastics, in which TiO 2 The weight percent content of the photocatalyst is 5.0%. The light transmittance and photocatalytic self-decomposition effect of photocatalytic self-decomposition polyvinyl chloride plastic were tested, and the results are shown in Table 1.

Embodiment 2

[0023] Commercially available P25 nanometer TiO 2 Put it in a container filled with ethanol, add vinyl tris (2-methoxyethoxy) silane (Z-6172) as a modifier after fully dispersing, and control the amount of TiO 2 5% of the added amount, stirred at 5°C for 24 hours, filtered, and dried to obtain modified TiO 2 solid powder. Add 2.0 grams of polyvinyl chloride plastic particles to 60 milliliters of tetrahydrofuran, stir until fully dissolved; then add 0.04 grams of modified TiO2 to the solution 2 Nano-powder, after stirring for 1 hour, air-dry THF at 80°C to obtain photocatalytic self-decomposing polyvinyl chloride plastic, in which TiO 2 The weight percent content of the photocatalyst is 2.0%. The light transmittance and photocatalytic self-decomposition effect of photocatalytic self-decomposition polyvinyl chloride plastic were tested, and the results are shown in Table 1.

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Abstract

The invention relates to a modified polychloroethylene resin, which mainly comprises polychloroethylene and modified nanometer titania. The modified nanometer titania is mainly prepared by the mixture of the nanometer titania and silane coupling agent which is showed by pattern I, proportion by weight of the nanometer titania and the polychloroethylene is 1 :( 5-500). The modified polychloroethylene resin which is prepared by the invention has better light (ultraviolet light or day light) degradability, and has higher light transmittance ratio, and the invention can be used to prepare environment-friendly-type plastic products. In the pattern I, R1, R2 and R3 are respectively chosen from one of alkoxy group of C1-C6 or O (CH2) aOR4, and a is 1-6 acroleic acid whose R4 is C1-C6.

Description

technical field [0001] The invention relates to a modified polyvinyl chloride resin, in particular to a modified polyvinyl chloride resin capable of photodegradation and good light transmission. Background technique [0002] The use of polyvinyl chloride in daily life has brought great convenience to human beings, but it has also brought greater threats to the environment. At present, there are two main methods of processing PVC plastic products: incineration and landfill. The incineration process of polyvinyl chloride plastics will produce a large amount of chlorinated organic compounds and the discharge of highly toxic and carcinogenic substances such as dioxins; the generation of dioxins and chlorinated organic compounds in the process of incinerating polyvinyl chloride has already A difficult problem that cannot be solved by ethylene incineration. Although the landfill method avoids the discharge of dioxins, it wastes and pollutes a large amount of land resources. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/06C08K3/22
Inventor 张金龙李刚刁世红陈锋
Owner EAST CHINA UNIV OF SCI & TECH
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