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A kind of method for deplating of metal-coated plastic

A metal coating and plastic technology, applied in the direction of improving process efficiency, can solve the problems of reducing use or regeneration value, affecting performance, environmental pollution, etc., and achieve the effect of improving flocculation effect, accelerating formation and settlement, and shortening flocculation time

Active Publication Date: 2019-05-03
浙江元力再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the chemical deplating of traditional nickel-copper alloy coatings, a large amount of nitric acid or ferric chloride is used, which will cause serious corrosion to the plastic itself during the reaction process, affecting its performance and reducing its use or regeneration value. At the same time, in the deplating solution Contains a large amount of nitrate or ammonia and high-valent iron, which will pollute the environment in subsequent processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0029] Carboxylated Dispersed Nano-SiO 2 Preparation: weigh 12g dispersed nano-SiO 2 Disperse in 1L ether solution, then add 8g of succinic anhydride, react at a constant temperature of 25°C for 2h, filter with suction to obtain a solid powder, transfer the solid powder to a constant temperature box, and dry it in vacuum at 45°C for 3h to 4h to obtain a white carboxyl group nano-SiO 2 particles.

[0030] Preparation of modified chitosan: weigh chitosan and add it into an acetic acid solution with a concentration of 0.5mol / L, stir until the chitosan is completely dissolved to obtain a chitosan solution with a mass concentration of 10%, and then add the chitosan solution per liter of shell Add 5mL span-80 to the polysaccharide solution, stir at 650r / min for 0.5h, then add carboxylated nano-SiO with the same mass as chitosan 2 Stir, put it in a constant temperature water bath at 66°C for 6 hours, cool to room temperature, drop the solution into an equal volume of 1mol / L NaOH s...

preparation Embodiment 2

[0034] Carboxylated Dispersed Nano-SiO 2 Preparation: Weigh 16g of dispersed nano-SiO 2 Disperse in 1L of ether solution, add 12g of succinic anhydride, react at a constant temperature of 25°C for 2h, suction filter to obtain a solid powder, transfer the solid powder to a constant temperature box and vacuum dry at 45°C for 3h to 4h to obtain a white carboxyl group Nano-SiO 2 particles.

[0035] Preparation of modified chitosan: weigh chitosan and add it into an acetic acid solution with a concentration of 0.5mol / L, stir until the chitosan is completely dissolved to obtain a chitosan solution with a mass concentration of 8%, and then add the chitosan solution per liter of shell Add 4.5mL span-80 to the polycan solution, stir at 600r / min for 0.5h, then add carboxylated nano-SiO with the same mass as chitosan 2 Stir, put it in a constant temperature water bath at 60°C for 6 hours, cool to room temperature, drop the solution into an equal volume of 1mol / L NaOH solution with a n...

preparation Embodiment 3

[0039] Carboxylated Dispersed Nano-SiO 2 Preparation: Weigh 14g dispersed nano-SiO 2 Disperse in 1L ether solution, then add 10g of succinic anhydride, react at a constant temperature of 25°C for 2h, suction filter to obtain a solid powder, transfer the solid powder to a constant temperature box, and vacuum dry at 45°C for 3h-4h to obtain a white carboxyl group Nano-SiO 2 particles.

[0040] Preparation of modified chitosan: weigh chitosan and add it into an acetic acid solution with a concentration of 0.5mol / L, stir until the chitosan is completely dissolved to obtain a chitosan solution with a mass concentration of 8%, and then add the chitosan solution per liter of shell Add 4.5mL span-80 to the polycan solution, stir at 600r / min for 0.5h, then add carboxylated nano-SiO with the same mass as chitosan 2 Stir, put it in a constant temperature water bath at 64°C for 6 hours, cool to room temperature, drop the solution into an equal volume of 1mol / L NaOH solution with a need...

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Abstract

The invention relates to the technical field of coating plastic stripping, in particular to a method for stripping plastic of a metal coating. The method comprises the steps of coating plastic cleaning, primary dissolving and leaching, ionic adsorption, filtering separation and secondary dissolving and leaching, wherein in the ionic adsorption step, chitosan composite is added into a leaching solution; the chitosan composite is composite compounded by disperse nano SiO2 modified chitosan and sodium alginate; and disperse nano SiO2 is nano SiO2 particles modified by gamma-aminopropyltrimethoxysilane. According to the method for stripping plastic of the metal coating provided by the invention, a plastic part does not need to crush, so that influences on plastic regeneration are greatly reduced; and moreover, nitric acid or ferric trichloride is prevented from being used, so that the plastic part is protected, and pollution on environment is reduced.

Description

technical field [0001] The invention relates to the technical field of deplating plastic coatings, in particular to a method for deplating metal coating plastics. Background technique [0002] With the rapid development of industry, the application of plastic electroplating is becoming more and more extensive, and it has become one of the important means of surface decoration in plastic products. At present, it has been widely used in ABS, polypropylene, polysulfone, polycarbonate, nylon, phenolic glass fiber reinforced Plastic, polystyrene and other plastic surfaces are electroplated, especially ABS plastic electroplating is the most widely used, and the electroplating effect is the best. ABS plastic electroplating parts are widely used in automobiles, hardware, electronic products and daily household products due to their advantages of light weight, easy processing, surface gloss and smoothness. ABS plastic often undergoes palladium activation-electroless nickel plating-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/24C22B23/00C22B15/00
CPCC22B3/24C22B7/007C22B15/0071C22B15/0086C22B23/043C22B23/0453Y02P10/20
Inventor 姚龚斌叶鹏
Owner 浙江元力再生资源有限公司
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