Method for removing surface coating of reflective PET (Polyethylene Terephthalate) aluminium plating film

A technology of surface coating and reflective film, applied in the field of removing the surface coating of PET aluminized reflective film, can solve the problems of PET's "yellowing, power consumption, increased white pollutant emissions, etc., to achieve recycling and cost savings. Effect

Inactive Publication Date: 2012-05-09
CHANGZHOU VOCATIONAL INST OF ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the scraps of PET reflective film in electronics factories and the recycled and aged PET reflective film are usually discarded directly, causing the discharge of "white pollutants" to increase day by day, and the pollution is becoming more and more serious; Great attention has been paid to the recycling system of waste PET reflective film resources and the construction of related industries, forming a relatively large-scale and relatively complete recycling industry system; currently recycling PET reflective film is through crushing, pre-washing, caustic soda (sodium hydroxide) Decoating with cleaning solution, rinsing with clean water, and sorting to obtain finished products: put the waste PET reflective film into a reactor containing a large amount of caustic soda, stir and heat for 24 hours, and then wash it repeatedly with clean water; on the one hand, even so, it is difficult to completely remove it The purpose of surface coating; on the other hand, due to the action of concentrated alkali, PET is prone to hydrolysis and "yellowing" phenomenon, which affects the quality of PET. This method consumes electricity, time and water.
More importantly, the waste water will pollute the environment after discharge, therefore, it is necessary to find a simple and feasible method to remove the surface coating of PET aluminized reflective film

Method used

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  • Method for removing surface coating of reflective PET (Polyethylene Terephthalate) aluminium plating film
  • Method for removing surface coating of reflective PET (Polyethylene Terephthalate) aluminium plating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] ① Prepare cleaning solution. First mix chlorobenzene with water, then add sodium hydroxide, sodium dodecylbenzene sulfonate and sodium carbonate and mix them uniformly to prepare a cleaning solution. Wherein the mass concentration of sodium hydroxide is 10 grams / L; The volume percentage of chlorobenzene is 40%, and the mass concentration of sodium dodecylbenzenesulfonate is 5 grams / L; The mass concentration of sodium carbonate is 5 grams / L;

[0043]② Cut the PET aluminized reflective film into pieces, put it into a reactor with a heating device, add the cleaning solution prepared in step ① into the reactor, and completely immerse the diaphragm. The quality of the PET aluminized reflective film is the same as that of the cleaning solution used. The ratio of volume (plasmid ratio g / mL) is 2:1;

[0044] ③ Turn on the heating device, heat with a medium with a temperature of 80°C, and heat at 80°C for 4 hours;

[0045] ④ After the material in the reactor is lowered to ...

Embodiment 2

[0048] ① Prepare cleaning solution. First mix ethanol and water, then add potassium hydroxide, sodium lauryl sulfate and potassium carbonate and mix them uniformly to prepare a cleaning solution. Wherein the mass concentration of potassium hydroxide is 80 grams / L; The volume percentage of ethanol is 20%, and the mass concentration of sodium lauryl sulfate is 10 grams / L; The mass concentration of potassium carbonate is 10 grams / L;

[0049] ② Cut the PET aluminized reflective film into pieces, put it into a reactor with a heating device, add the cleaning solution prepared in step ① into the reactor, and completely immerse the diaphragm. The quality of the PET aluminized reflective film is the same as that of the cleaning solution used. The ratio of volume (plasmid ratio g / mL) is 1:1;

[0050] ③ Turn on the heating device, heat with a medium with a temperature of 60°C, and heat at 60°C for 8 hours;

[0051] ④ After the material in the reactor is lowered to room temperature, tak...

Embodiment 3

[0054] ① Prepare cleaning solution. Firstly mix ethylene glycol with water, then add lithium hydroxide, methyl silicone oil and sodium silicate and mix evenly to prepare the cleaning solution. Wherein the mass concentration of lithium hydroxide is 40 grams / L; The volume percentage of ethylene glycol is 10%, and the mass concentration of methyl silicone oil is 1 gram / L; The mass concentration of sodium silicate is 1 gram / L;

[0055] ② Cut the PET aluminized reflective film into pieces, put it into a reactor with a heating device, add the cleaning solution prepared in step ① into the reactor, and completely immerse the diaphragm. The quality of the PET aluminized reflective film is the same as that of the cleaning solution used. The ratio of volume (plasmid ratio g / mL) is 3:2;

[0056] ③ Turn on the heating device, heat with a medium with a temperature of 40°C, and heat at 40°C for 10 hours;

[0057] ④ After the material in the reactor is lowered to room temperature, take out ...

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Abstract

The invention relates to a PET (Polyethylene Terephthalate) reflective film, in particular to a method for removing the surface coating of a reflective PET aluminium plating film. The method is characterized by comprising the steps of: immersing the reflective PET aluminium plating film into a cleaning solution, and heating at the temperature of 40-100 degrees centigrade, rinsing by using clean water to remove the coating adhered on the PET surface, and airing to obtain the recyclable PET film. The recycled PET film is colourless and transparent on the appearance and has the intrinsic viscosity being about 0.723; the melt strength of the recycled PET film can satisfy requirements of PET extrusion-blown molding (bottle) or even extrusion blown film; and in the same extrusion technological conditions, the intrinsic viscosity of the PET film, which has a yellow appearance and is recycled by using the traditional method of hermetically boiling by using 20% caustic soda at high temperature for more than 24 hours, is reduced to about 0.564 and cannot satisfy the requirements of the extrusion-blown molding (bottle). The test in the invention proves that the method has the advantages of high-efficiency technology, time/water/electricity-saving performance, environment friendliness, zero discharge of waste water and practicability, is benefiical to realization of recycle of the reflective PET aluminium plating film, and is suitable for recycling and practical.

Description

technical field [0001] The invention relates to a PET reflective film, in particular to a method for removing the surface coating of the PET aluminized reflective film. Background technique [0002] PET film is vapor-deposited by a high-vacuum coating machine. It has bright metallic luster, excellent gas and light barrier properties, and good moisture-proof, heat-resistant, and puncture-resistant properties. It can replace aluminum foil and other advantages and can be widely used. Food packaging, high-end industrial packaging, compounding, printing, self-adhesive labels, etc., and has excellent adaptability to printing, packaging, and bonding. However, the scraps of PET reflective film in electronics factories and the recycled and aged PET reflective film are usually discarded directly, causing the discharge of "white pollutants" to increase day by day, and the pollution is becoming more and more serious; Great attention has been paid to the recycling system of waste PET re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/36
Inventor 李树白薛叙明张启蒙贺新刘英莉赵绍洪刘志文张耀辉顾月袁梅
Owner CHANGZHOU VOCATIONAL INST OF ENG
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