CN111206273A - Micro-roughening process for surface appearance of plastic part - Google Patents

Abstract

The invention provides a micro-roughening process for the surface appearance of a plastic part, which comprises the following steps: preprocessing and coarsening a workpiece; the workpiece pretreatment is an oil removing process, and the operation process comprises the following steps: s1, preprocessing a workpiece, namely preprocessing an ABS workpiece to be processed, firstly washing the surface of the ABS workpiece with clear water, removing dust and impurities on the surface, then immersing the ABS workpiece to be processed into a 20% acetone solution for 5-10S, and then drying the ABS workpiece at a high temperature for at least 8 hours by using an oven, wherein the drying temperature is 80-90 ℃, and the constant temperature is kept; s2, preparing an etching solution, wherein the raw materials of the etching solution are 10g/L potassium permanganate and 30ml/L industrial sulfuric acid; the invention improves the micro-roughening process of the surface appearance of the plastic part, and has the advantages of reasonable process design, good pretreatment effect, strong dirt removing capability, high roughening speed, good effect, high plating layer binding force, reduction of chromic anhydride consumption and cost reduction, thereby effectively solving the problems and the defects provided by the invention.

Description

Micro-roughening process for surface appearance of plastic part

Technical Field

The invention relates to the technical field of plastic part processing, in particular to a micro-roughening process for the surface appearance of a plastic part.

Background

Plastic plated articles have the characteristics of both plastic and metal. It has small specific weight, good corrosion resistance, simple and convenient forming, metallic luster and metallic texture, and also has the characteristics of electric conduction, magnetic conduction, welding and the like. It can save complex machining process, save metal material, and it is pleasing to the eye, decorative strong, simultaneously, it has still improved the mechanical strength of working of plastics. Because the metal plating layer has higher stability to external factors such as light, weather and the like, after the plastic is plated with metal, the plastic can be prevented from aging, and the service life of the plastic part is prolonged. With the rapid development of industry and the increasingly wide application of plastic electroplating, the surface decorative coating becomes one of the important means of surface decoration in plastic products. At present, the electroplating is widely carried out on the surfaces of plastics such as ABS, polypropylene, polysulfone, polycarbonate, nylon, phenolic glass fiber reinforced plastics, polystyrene and the like at home and abroad, wherein the ABS plastics are most widely electroplated and have the best electroplating effect.

Coarsening is a pipe fitting step in the plastic surface electroplating pretreatment process, namely, the plastic surface is in a microscopic rough state, the contact surface of a plating layer and the plastic is enlarged, and a large number of hydrophilic groups are formed on the plastic surface to change the plastic into a hydrophilic body.

Before the chromic acid and sulfuric acid mixed solution is coarsened, an organic solvent (such as dichloroethane or acetone) is used for pretreating an ABS workpiece to enhance the coarsening effect, but the price of the organic solvent is higher; if the coarsening liquid is used for coarsening repeatedly, the coarsening effect can also be enhanced, but the consumption of chromic anhydride is directly increased, the cost is greatly improved, the pollution is serious, the treatment difficulty of the subsequent coarsening liquid is increased, and the use has great limitation.

In view of the above, the present invention provides a micro-roughening process for the surface appearance of a plastic part, which aims to solve the problems and improve the practical value.

Disclosure of Invention

The invention aims to provide a micro-roughening process for the surface appearance of a plastic part, which aims to solve the problem that an ABS (acrylonitrile butadiene styrene) workpiece is pretreated by using an organic solvent (such as dichloroethane or acetone) before the roughening of a chromic acid and sulfuric acid mixed solution, so as to enhance the roughening effect, but the price of the organic solvent is higher; if the coarsening effect can be enhanced by repeatedly coarsening the coarsening liquid, but the dosage of the chromic anhydride is directly increased, the cost is greatly improved, the pollution is serious, the treatment difficulty of the subsequent coarsening liquid is increased, and the problem and the defect of great limitation exist during the use.

In order to achieve the purpose, the invention provides a micro-roughening process for the surface appearance of a plastic part, which is achieved by the following specific technical means:

a process for micro-roughening the surface appearance of a plastic part comprises the following steps: preprocessing and coarsening a workpiece; the workpiece pretreatment is an oil removing process, and the operation process comprises the following steps:

s1, preprocessing a workpiece, namely preprocessing an ABS workpiece to be processed, firstly washing the surface of the ABS workpiece by using clear water, removing dust and impurities on the surface, then immersing the ABS workpiece to be processed into a 20% acetone solution for 5-10S, and then drying the ABS workpiece at a high temperature for at least 8 hours by using an oven, wherein the drying temperature is 80-90 ℃, and the constant temperature is kept;

s2, preparing an etching solution, wherein the etching solution is prepared from 10g/L potassium permanganate and 30ml/L industrial sulfuric acid, and the preparation method comprises the following steps: firstly, weighing a proper amount of potassium permanganate, weighing a proper amount of industrial sulfuric acid, completely dissolving potassium permanganate particles by using warm water, slowly pouring the industrial sulfuric acid, continuously stirring in the process of pouring the industrial sulfuric acid, then slowly pouring the solution into water for dilution, continuously stirring in the process of pouring the solution, and finally heating to 60-65 ℃ for use;

and S3, etching, pouring the etching solution into an etching groove, then immersing the ABS workpiece into the etching solution for 3-5 seconds generally, observing the surface condition of the workpiece after the workpiece is completely immersed into the etching solution, immediately taking out the workpiece once micro bubbles are generated on the surface of the workpiece, and quickly entering the next procedure after cleaning.

The operation process of the coarsening process comprises the following steps:

s1, preparing a roughening solution, wherein the roughening solution is prepared from 20g/L chromic acid, 800ml/L industrial sulfuric acid and 10ml/L wetting agent, and the preparation method comprises the following steps: firstly, measuring a proper amount of chromic acid and industrial sulfuric acid, slowly pouring the industrial sulfuric acid into the chromic acid, continuously stirring the industrial sulfuric acid while pouring the industrial sulfuric acid into the chromic acid, slowly pouring the solution into water for dilution, continuously stirring the solution while pouring the solution into the solution, and finally heating the solution to 50-60 ℃ for use;

s2, soaking, pouring the roughening solution into the roughening tank, completely soaking the ABS workpiece into the roughening solution for 5-15min, and taking out the ABS workpiece after soaking;

s3, cleaning, namely fully cleaning the roughened ABS workpiece, and then drying the ABS workpiece at a high temperature of 80-90 ℃ for at least 2 hours by using an oven;

s3, treating the waste liquid, namely treating the waste liquid of the coarsening liquid by using diaphragm electrolysis, placing the coarsening waste liquid in an anode chamber, injecting sulfuric acid into a cathode chamber, electrifying direct current, oxidizing trivalent chromium into hexavalent chromium on the surface of an anode, and simultaneously transferring some metal impurity ions to the cathode chamber through the diaphragm, thereby achieving the regeneration and purification of the coarsening waste liquid.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the invention improves the micro-roughening process of the surface appearance of the plastic part, and has the advantages of reasonable process design, good pretreatment effect, strong dirt removing capability, high roughening speed, good effect, high plating layer binding force, reduction of chromic anhydride consumption and cost reduction, thereby effectively solving the problems and the defects provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The invention provides a specific technical implementation scheme of a micro-roughening process for the surface appearance of a plastic part, which comprises the following steps:

a process for micro-roughening the surface appearance of a plastic part comprises the following steps: preprocessing and coarsening a workpiece; the pretreatment of the workpiece is an oil removing process, and the operation process comprises the following steps:

s1, preprocessing a workpiece, namely preprocessing an ABS workpiece to be processed, firstly washing the surface of the ABS workpiece by using clear water, removing dust and impurities on the surface, then immersing the ABS workpiece to be processed into a 20% acetone solution for 5-10S, and then drying the ABS workpiece at a high temperature for at least 8 hours by using an oven, wherein the drying temperature is 80-90 ℃, and the constant temperature is kept;

s2, preparing an etching solution, wherein the etching solution is prepared from 10g/L potassium permanganate and 30ml/L industrial sulfuric acid, and the preparation method comprises the following steps: firstly, weighing a proper amount of potassium permanganate, weighing a proper amount of industrial sulfuric acid, completely dissolving potassium permanganate particles by using warm water, slowly pouring the industrial sulfuric acid, continuously stirring in the process of pouring the industrial sulfuric acid, then slowly pouring the solution into water for dilution, continuously stirring in the process of pouring the solution, and finally heating to 60-65 ℃ for use;

and S3, etching, pouring the etching solution into an etching groove, then immersing the ABS workpiece into the etching solution for 3-5 seconds generally, observing the surface condition of the workpiece after the workpiece is completely immersed into the etching solution, immediately taking out the workpiece once micro bubbles are generated on the surface of the workpiece, and quickly entering the next procedure after cleaning.

The operation process of the coarsening process comprises the following steps:

s1, preparing a roughening solution, wherein the roughening solution is prepared from 20g/L chromic acid, 800ml/L industrial sulfuric acid and 10ml/L wetting agent, and the preparation method comprises the following steps: firstly, measuring a proper amount of chromic acid and industrial sulfuric acid, slowly pouring the industrial sulfuric acid into the chromic acid, continuously stirring the industrial sulfuric acid while pouring the industrial sulfuric acid into the chromic acid, slowly pouring the solution into water for dilution, continuously stirring the solution while pouring the solution into the solution, and finally heating the solution to 50-60 ℃ for use;

s2, soaking, pouring the roughening solution into the roughening tank, completely soaking the ABS workpiece into the roughening solution for 5-15min, and taking out the ABS workpiece after soaking;

s3, cleaning, namely fully cleaning the roughened ABS workpiece, and then drying the ABS workpiece at a high temperature of 80-90 ℃ for at least 2 hours by using an oven;

s3, treating the waste liquid, namely treating the waste liquid of the coarsening liquid by using diaphragm electrolysis, placing the coarsening waste liquid in an anode chamber, injecting sulfuric acid into a cathode chamber, electrifying direct current, oxidizing trivalent chromium into hexavalent chromium on the surface of an anode, and simultaneously transferring some metal impurity ions to the cathode chamber through the diaphragm, thereby achieving the regeneration and purification of the coarsening waste liquid.

In summary, the following steps: the plastic part surface appearance micro-roughening process has the advantages of reasonable process design, good pretreatment effect, strong dirt removing capability, high roughening speed, good effect, high coating binding force, reduction of chromic anhydride consumption and reduction of cost through improvement of the plastic part surface appearance micro-roughening process, so that the problems and the defects provided by the invention are effectively solved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A process for micro-roughening the surface appearance of a plastic part comprises the following steps: preprocessing and coarsening a workpiece; the method is characterized in that: the workpiece pretreatment is an oil removing process, and the operation process comprises the following steps:

s1, preprocessing a workpiece, namely preprocessing an ABS workpiece to be processed, firstly washing the surface of the ABS workpiece with clear water, removing dust and impurities on the surface, then immersing the ABS workpiece to be processed into a 20% acetone solution for 5-10S, and then drying the ABS workpiece at a high temperature for at least 8 hours by using an oven, wherein the drying temperature is 80-90 ℃, and the constant temperature is kept;

s2, preparing an etching solution, wherein the etching solution is prepared from 10g/L potassium permanganate and 30ml/L industrial sulfuric acid, and the preparation method comprises the following steps: firstly, weighing a proper amount of potassium permanganate, weighing a proper amount of industrial sulfuric acid, completely dissolving potassium permanganate particles by using warm water, slowly pouring the industrial sulfuric acid, continuously stirring in the process of pouring the industrial sulfuric acid, then slowly pouring the solution into water for dilution, continuously stirring in the process of pouring the solution, and finally heating to 60-65 ℃ for use;

s3, etching, pouring etching liquid into an etching groove, then immersing the ABS workpiece into the etching liquid for 3-5 seconds generally, observing the surface condition of the workpiece after the workpiece is completely immersed into the etching liquid, immediately taking out the part once micro bubbles are generated on the surface of the workpiece, and quickly entering the next procedure after cleaning;

the operation process of the coarsening process comprises the following steps:

s1, preparing a roughening solution, wherein the roughening solution is prepared from 20g/L chromic acid, 800ml/L industrial sulfuric acid and 10ml/L wetting agent, and the preparation method comprises the following steps: firstly, measuring a proper amount of chromic acid and industrial sulfuric acid, slowly pouring the industrial sulfuric acid into the chromic acid, continuously stirring the industrial sulfuric acid while pouring the industrial sulfuric acid into the chromic acid, slowly pouring the solution into water for dilution, continuously stirring the solution while pouring the solution into the solution, and finally heating the solution to 50-60 ℃ for use;

s2, soaking, pouring the roughening solution into the roughening tank, completely soaking the ABS workpiece into the roughening solution for 5-15min, and taking out the ABS workpiece after soaking;

s3, cleaning, namely fully cleaning the roughened ABS workpiece, and then drying the ABS workpiece at a high temperature of 80-90 ℃ for at least 2 hours by using an oven;

s3, treating the waste liquid, namely treating the waste liquid of the coarsening liquid by using diaphragm electrolysis, placing the coarsening waste liquid in an anode chamber, injecting sulfuric acid into a cathode chamber, electrifying direct current, oxidizing trivalent chromium into hexavalent chromium on the surface of an anode, and simultaneously transferring some metal impurity ions to the cathode chamber through the diaphragm, thereby achieving the regeneration and purification of the coarsening waste liquid.