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Palladium-free activation process for plastic substrate surface of nickel adsorbed sodium carboxymethylcellulose by chelating function

A technology of sodium carboxymethyl cellulose and carboxymethyl cellulose is applied in liquid chemical plating, metal material coating process, coating and other directions to achieve the effects of simple and feasible process, cost reduction and high operability

Inactive Publication Date: 2009-03-11
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems existing in the palladium-free activated nickel plating method in the above-mentioned prior art, the purpose of the present invention is to provide a method with wide material sources, low price, firm coating, no need for drying treatment, and chemical coating on many plastic substrates. The palladium-free activation method of nickel plating solves the shortcomings of the existing chemical plating activation process

Method used

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  • Palladium-free activation process for plastic substrate surface of nickel adsorbed sodium carboxymethylcellulose by chelating function
  • Palladium-free activation process for plastic substrate surface of nickel adsorbed sodium carboxymethylcellulose by chelating function
  • Palladium-free activation process for plastic substrate surface of nickel adsorbed sodium carboxymethylcellulose by chelating function

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1 (see attached figure 2 ):

[0022] This test is a non-palladium activation method on the surface of the plastic substrate of carboxymethylcellulose sodium chelated and adsorbed nickel with PET plastic as the substrate, using 2 × 5cm 2 , a PET plastic sheet with a thickness of 100 μm is used as the base material, immersed in the above-mentioned 40°C degreasing solution for 15 minutes, washed with water, then immersed in the above-mentioned roughening solution at 55°C for 30 minutes, washed with water, and put in sodium carboxymethylcellulose (FH6, Extra-high type) 5g / L, nickel sulfate 10g / L prepared in the activation solution for 5min, temperature 40 ℃, washed with water, then reduced in 1g / L sodium borohydride solution at room temperature for 5min, washed with water, and finally put Plating in the electroless plating solution for 5 minutes, the brightness of the obtained coating is grade one, observed by metallographic microscope (see image 3 photo), th...

Embodiment 2

[0034] Using 2×5cm 2 , a PET film with a thickness of 100 μm was used as the substrate, and the pretreatment, activation and reduction treatments were completed under the same conditions as in Example 1. The difference is that the formula of the activation solution is 15g / L of sodium carboxymethyl cellulose and 15g / L of nickel sulfate. Then electroless plating is carried out, and the brightness of the obtained coating is grade one. Through metallographic microscopic observation, the coating is flat, densely bonded and excellent in bonding force.

Embodiment 3

[0036] Adopt 8×6cm 2 , polyvinyl chloride plastic with a thickness of 0.3cm is used as the base material, and the pretreatment, activation and reduction treatment are completed under the same conditions as in Example 1. The brightness of the obtained coating is second-level. Through metallographic microscopic observation, the coating is smooth, densely bonded, and the bonding force is high. excellent.

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Abstract

The invention provides a method for non-precious metal Pd-free plastic matrix surface activation using sodium carboxymethyl cellulose to chelae and absorb nickel, which comprises the processing steps of pretreatment of the surface of the plastic matrix to be plated, preparation of an activating and film forming liquid, treatment of activation and film forming, treatment of reduction, and chemical nickel plating; and a metal organic complex solution consisting of divalent ion water soluble salt containing nickel uses a strong reducing agent to directly reduce the active metal-nickel and deposit on the matrix, then the chemical nickel plating is carried out. The result of the configuration of a nickel plating layer by a scanning electron microscope and a metaloscope shows that the plating layer is combined compactly, and particles are evenly distributed; and scratch tests show that the bonding force of the plating layer is good. The method has simple process, convenient operation, wide sources and low price of sodium carboxymethyl cellulose used, low cost and reduced precious metal pollution due to replacement of expensive Pd by nickel, can be suitable for most of plastics due to low activation temperature, and has high practical value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical plating through the decomposition of a liquid compound or the decomposition of a coating-forming compound solution, and no surface material reaction product remains in the coating, and relates to a method for metallizing the surface of a plastic substrate, in particular to a method for metallizing a plastic substrate The invention relates to a palladium-free activation method on the surface of a plastic substrate on which carboxymethylcellulose sodium chelates and adsorbs nickel before electroless plating. Background technique [0002] There are many methods of metallizing plastic surfaces, among which electroless plating is a processing method widely used at present. Electroless plating on the surface of plastics mainly uses reducing agents to form a metal coating on the surface of plastics under the catalysis of catalytically active substances. Therefore, before electroless plating, a layer of...

Claims

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Application Information

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IPC IPC(8): C23C18/34C23C18/22C23C18/18
Inventor 刘祥萱吴春王煊军黄洁
Owner PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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