Electroplating pretreatment method for acrylonitrile butadiene styrene (ABS) plastic surface

A pre-treatment technology for ABS plastics and electroplating, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of complex processing process, high price, adverse effects on operators and the environment, and achieve simple process , the effect of convenient operation

Inactive Publication Date: 2012-04-11
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention proposes a method for pre-treatment of ABS plastic surface electroplating, the purpose of which is to solve the complex process of traditional process, using PdCl2 Expensive, easy to pollute the plating solution, or sodium borohydride and methanol activation process will have adverse effects on operators and the environment

Method used

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  • Electroplating pretreatment method for acrylonitrile butadiene styrene (ABS) plastic surface
  • Electroplating pretreatment method for acrylonitrile butadiene styrene (ABS) plastic surface
  • Electroplating pretreatment method for acrylonitrile butadiene styrene (ABS) plastic surface

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Effect test

Embodiment 1

[0056] (4) The chromic acid system is used for roughening, the purpose of which is to increase the microscopic roughness, contact area and hydrophilic ability of the surface of the part, so as to ensure good adhesion of the coating, which is the key process to determine the adhesion of the coating. There are many methods of roughening, and the most widely used is the chromic acid system, which has fast roughening speed and good coating adhesion. Process conditions: 400 g / L CrO 3 , 350mL / L H 2 SO 4 , temperature 65 ℃, time 50 min.

[0057] (5) Neutralization treatment: After chemical roughening treatment, the microporous structure on the surface of plastic parts contains some hexavalent chromium and other impurities. If the cleaning is not thorough, it will affect the bonding force between the plastic and the coating and pollute the plating solution. For this reason, the following process was used for neutralization treatment: 100 g / L NaOH solution, the temperature was room...

Embodiment 2

[0067] (4) Coarsening adopts chromic acid system, process conditions: 400 g / L CrO 3 , 350mL / L H 2 SO 4 , temperature 75 ℃, time 70 min.

[0068] (5) Neutralization treatment: process conditions: 100 g / L NaOH solution, the temperature is room temperature, and the time is 5 minutes.

[0069] (6) Chemical activation: activation solution formula: nickel sulfate concentration 12g / L, sodium hypophosphite concentration 25g / L, stabilizer sodium citrate concentration 8g / L, pH=11, temperature 75°C. The activation method is as follows: dissolve nickel sulfate in sodium citrate solution, then add sodium hypophosphite solution, and then adjust the pH value with dilute ammonia water with a volume fraction of 20%. When activating, put the plastic substrate into the solution and use a constant temperature water bath to After heating up to 75°C, carry out constant temperature treatment at this temperature for 10 minutes.

[0070] The plastic after electroplating pretreatment is observed u...

Embodiment 3

[0078] (4) Coarsening adopts chromic acid system, process conditions: 400 g / L CrO 3 , 350mL / L H 2 SO 4 , temperature 70 ℃, time 60 min.

[0079] (5) Neutralization treatment: process conditions: 100 g / L NaOH solution, room temperature, 4 minutes.

[0080] (6) Chemical activation: activation solution formula: nickel sulfate concentration 11g / L, sodium hypophosphite concentration 22g / L, stabilizer sodium citrate concentration 7g / L, pH=10, temperature 73°C. The activation method is as follows: dissolve nickel sulfate in sodium citrate solution, then add sodium hypophosphite solution, and then adjust the pH value with dilute ammonia water with a volume fraction of 20%. When activating, put the plastic substrate into the solution and use a constant temperature water bath to After the temperature was raised to 73°C, a constant temperature treatment was carried out at this temperature for 20 minutes.

[0081] The plastic after electroplating pretreatment is observed under a scan...

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Abstract

The invention relates to an electroplating pretreatment method for an acrylonitrile butadiene styrene (ABS) plastic surface. The electroplating pretreatment method comprises the following process steps of: eliminating stress, performing alkali washing for oil removal, pickling, roughening, performing neutralizing treatment, performing chemical activation, and performing the conventional electroplating, wherein in the chemical activation process, plastic base materials are put in to an activation solution and are subjected to hyperthermic treatment in a water bath for a certain period of time, each liter of the activation solution comprises 10 to 12g of nickel sulfate, 20 to 25g of sodium hypophosphite and 5 to 8g of sodium citrate, the pH is 9 to 11, and the temperature is between 70 and 75 DEG C. In the invention, a novel method in which metal palladium activation is not used is provided, can be used for replacing a sodium borohydride and methanol activation process and contributes to environment friendliness; and on the basis of pretreatment, the plastic surface can be directly electroplated, so that the problems of complicated treating processes, high PdCl2 prices, high pollution possibility of a plating solution and the like are solved.

Description

technical field [0001] The invention relates to a pretreatment method for ABS plastic surface electroplating, which belongs to the technical field of plastic surface electroplating. Background technique [0002] Plastic electroplating refers to the whole process of using certain processing methods to first generate activated centers on the plastic surface, using electroless plating or displacement plating to form a conductive film, and then using conventional electroplating to thicken the whole process. At home and abroad, the metal palladium activation technology is mainly used, and the traditional process is to use PdCl 2 -SnCl 2 Activation-sensitization method, and the process is complex, using PdCl 2 The price is expensive, and it is easy to pollute the plating solution, so its application is limited to a certain extent. The preparation without palladium activation is also concentrated in sodium borohydride and methanol activation process, but this process is unfavorab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/30C23C18/36C25D5/56
Inventor 孙硕徐炳辉于锦刘聪颖温宇洪文英
Owner SHENYANG POLYTECHNIC UNIV
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