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Polymer surface fluorination technique

A polymer and chemical process technology, applied in the field of polymer surface treatment technology, can solve the problems of large loss of treatment efficiency and long reaction time, and achieve the effects of saving fluorination time, improving production efficiency and improving barrier effect.

Active Publication Date: 2010-11-10
洛阳森蓝化工材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two fluorinations require a longer reaction time and a greater loss of processing efficiency

Method used

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  • Polymer surface fluorination technique
  • Polymer surface fluorination technique

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 500 220ml HDPE oil tanks into the fluorination furnace, and put 3000kg of adsorbent at the same time; close the furnace door, use circulating hot water to heat the furnace to 70°C, evacuate and replace it with high-purity nitrogen twice, and feed 20 % Fluorine nitrogen to the pressure of -0.02MPa in the fluorination furnace, start the forced circulation of gas in the fluorination furnace, react for 20 minutes, and keep the temperature in the fluorination furnace at 70-75°C. Evacuate the gas in the furnace and replace it twice with high-purity nitrogen, take out the fuel tank, observe the obvious passivation effect on the surface of the fuel tank, measure the fluorine content on the surface of the fuel tank to 315 μg / cm2, fill the fuel tank with 93# ethanol gasoline, and perform solvent penetration according to EPA standards According to the test, the permeability is 0.28g / m2.d under the constant temperature condition of 40°C, which is far lower than the EPA standard ...

Embodiment 2

[0027] Put 250 500ml HDPE oil tanks into the fluorination furnace, and put 2500g of adsorbent at the same time; close the furnace door, heat the furnace to 70°C with circulating hot water, evacuate and replace it with high-purity nitrogen twice; % Fluorine nitrogen to the pressure of -0.02MPa in the fluorination furnace, start the forced circulation of the gas in the fluorination furnace, react for 40 minutes, and keep the temperature in the fluorination furnace at 70-75°C; evacuate the gas in the furnace and replace it with high-purity nitrogen twice, Take out the fuel tank; observe the obvious passivation effect on the surface of the fuel tank, and measure the fluorine content on the surface of the fuel tank to 280μg / cm2; fill the fuel tank with 93# ethanol gasoline, and conduct a solvent penetration test according to EPA standards, and the permeability is 0.35g / m2 at a constant temperature of 40°C .d, far below the EPA standard requirements.

Embodiment 3

[0029] Put 800 150ml HDPE oil tanks into the fluorination furnace, and put 2500g of adsorbent at the same time; close the furnace door, heat the furnace to 50°C with circulating hot water, evacuate and replace it with high-purity nitrogen twice; Fluorine gas to the pressure in the fluorination furnace is -0.08MPa, and then high-purity nitrogen gas is introduced until the pressure in the fluorination furnace is -0.04MPa, the internal forced circulation of the gas in the fluorination furnace is started, and the reaction is 60min, and the temperature in the fluorination furnace is maintained at 50 ~55°C; evacuate the gas in the furnace and replace it twice with high-purity nitrogen, take out the fuel tank; observe the surface of the fuel tank to show obvious passivation effect, and measure the fluorine content on the surface of the fuel tank to 305 μg / cm2; fill the fuel tank with 93# ethanol gasoline, according to EPA The solvent penetration test is carried out according to the st...

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Abstract

The invention relates to a polymer surface fluorination technique, which comprises the steps of: putting polymer product and adsorbent into a fluorination chamber, heating the gas and the polymer product in a fluorination furnace into 10-80 DEG C, and vacuumizing the fluorination furnace and using nitrogen for replacement; filling fluoride or nitrogen fluoride into the fluorination furnace, and controlling the fluoride concentration to be 5-50% and the pressure in a fluorination chamber to be -0.08 to 0.1MPa; and leading the gas in the fluorination furnace to have forced circulation, and controlling the temperature of the fluorination chamber to be 10-80 DEG C and the reaction time to be 20-120 min. The polymer surface fluorination technique effectively improves the polymer surface fluorination efficiency, and leads the surface of a fluorination layer to be deeper and more uniform.

Description

Technical field: [0001] The invention relates to a polymer surface treatment process, in particular to a polymer surface fluorination process. Background technique: [0002] Polymer products refer to fuel tanks, containers, oil pipes, films and other items made of polyethylene, polypropylene, rubber and other materials. After fluorinating the surface of the polymer, its surface can change from a carbon-hydrogen structure to a carbon-fluorine bond structure, forming a barrier layer that is covalently bonded to the entire polymer matrix to form an inseparable whole. The barrier layer is similar to the polytetrafluoroethylene structure and has excellent barrier and chemical resistance properties. [0003] At present, fluorination treatment of polymer surfaces mainly includes on-line fluorination and off-line fluorination. The online fluorination method is mainly used in the production of fluorinated bottles, while the off-line fluorination method is more used for polymer prod...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08L23/06
Inventor 韩保国崔武孝阎晓冬
Owner 洛阳森蓝化工材料科技有限公司
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