CN108164954B

CN108164954B - Electroplating PC/ABS material with high plating capacity and preparation method and application thereof

Info

Publication number: CN108164954B
Application number: CN201711173340.4A
Authority: CN
Inventors: 邵成华; 孙阳; 蒋斌; 罗明华; 辛敏琦
Original assignee: Shanghai Kumho Sunny Plastics Co Ltd
Current assignee: Shanghai Kumho Sunny Plastics Co Ltd
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2020-04-24
Anticipated expiration: 2037-11-22
Also published as: CN108164954A

Abstract

The invention relates to an electroplating PC/ABS material with high plating capacity, a preparation method and application thereof, wherein the material comprises the following components in percentage by weight: 30-80% of polycarbonate, 5-50% of SAN, 10-20% of polybutadiene rubber powder, 0.5-3% of wax-coated metal powder and 0.4-1% of antioxidant, wherein the materials are firstly mixed in a high-speed mixer, then the materials are subjected to melt extrusion and granulation to prepare the material, the material can be electroplated to be used as an electroplating piece, the material is required to be coarsened and then cleaned in the electroplating process, and then wax is removed by using a wax remover, so that the metal powder is exposed. Compared with the prior art, the wax-coated metal powder is added into the electroplating material, so that the cost of the electroplating process can be reduced, the phenomenon of plating leakage is not easy to occur, and the sensory quality can be effectively improved.

Description

Electroplating PC/ABS material with high plating capacity and preparation method and application thereof

Technical Field

The invention belongs to the technical field of high polymer materials, and relates to an electroplating PC/ABS material with high plating capacity, and a preparation method and application thereof.

Background

Polycarbonate (PC), a common type of engineering plastic, has excellent rigidity and toughness because it has both a rigid benzene ring and a flexible carbonate bond in its structure. But also suffer from physical disadvantages such as poor flow, notch sensitivity and thick wall sensitivity. For these problems, it is a common practice to blend PC with other materials, especially PC/ABS materials composed of ABS, which can make up for the deficiencies well, have significant advantages in mechanical properties and processability, and become a favored engineering plastic for the industries of automobiles, home appliances, and the like.

Among many applications of PC/ABS, one is used as a plating material and plays a role in household appliances, automobile interior and exterior trims and the like.

According to the principle of electroplating, plastics cannot be electroplated, and a loop can be formed on an electroplating line and becomes a component which can be electroplated only after the surface of the plastics is conductive, namely the surface of the plastics is metalized.

In the actual production process, the process from the blank to the metallization is complex, and the final surface of the electroplated part leaks due to a series of problems such as stress, insufficient coarsening, the clamping problem of the electroplated part, the concentration of the electroplating bath solution, the chemical plating time and the like, so that the problem of plating leakage is caused. In particular, for complex parts with deep holes and grooves and more shape changes, the probability of problems becomes higher.

It is also known that more cost is spent on plating for the plated part. Therefore, it is a significant task to improve the yield of the electroless plating of the product and even reduce the electroless plating operation.

Chinese patent CN102367327A discloses an electroplating PC/ABS alloy, which achieves the purpose of electric conduction by adding conductive agent-superconducting carbon black, and the use of the conductive PC/ABS can save a complex roughening process, thereby being economical and environment-friendly and ensuring higher electroplating yield. However, in the actual production process, the bulk density of the superconducting carbon black is 100-120 kg/m³The fluffy bulk density causes the difficulty of raw material blanking and is inconvenient for production and processing. The metal powder does not have such a problem.

Chinese patent CN105518074A discloses a blended thermoplastic composition comprising a polycarbonate polymer, a polycarbonate-polysiloxane copolymer, a laser direct structuring additive and a metal, which can be electroplated. However, this invention is more directed to some simple planar plating structures, such as plating lines, etc., and the processing is difficult to be smoothly performed when the structure is complicated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an electroplating PC/ABS material with high plating capacity, a preparation method and application thereof.

The purpose of the invention can be realized by the following technical scheme:

the high-plating-capacity electroplating PC/ABS material comprises the following components in percentage by weight:

preferably, the composition consists of the following components in percentage by weight:

preferably, the polycarbonate is bisphenol A polycarbonate with viscosity average molecular weight of 20000-30000 g/mol. PC in this molecular weight range has a combination of processing flowability and strength.

Preferably, the viscosity average molecular weight of the SAN is 100000-200000 g/mol, and the mass content of acrylonitrile in the SAN is 24-30%. SAN in this range provides better flowability and is more favorable for material processing and forming.

Preferably, the viscosity average molecular weight of the polybutadiene rubber powder is 100000-200000 g/mol, and the rubber content is 50-60%. This range of rubber powder facilitates a rough etch to support subsequent plating.

Through the selection of the components, the preparation of the material and the subsequent electroplating are favorably carried out smoothly.

Preferably, the wax-coated metal powder is one or more of aluminum powder, silver powder, gold powder, palladium powder, magnesium powder and nickel powder coated with wax, and the particle size of the metal powder in the wax-coated metal powder is 10-500 μm.

Preferably, the thickness of the wax layer of the wax-coated metal powder is 0.01 to 1 μm, and the material of the wax layer may be paraffin or the like.

Preferably, the antioxidant is one or a mixture of several commercially available antioxidants Irganox1010, Irganox1076 and Irganox 168. These classes of antioxidants have better compatibility with the matrix material and antioxidant effect.

The preparation method of the electroplating PC/ABS material with high plating capacity comprises the following steps:

placing polycarbonate, SAN, polybutadiene rubber powder, wax-coated metal powder and an antioxidant into a high-speed mixer, mixing for 10-20 min to obtain a mixed material, putting the mixed material into a double-screw extruder, controlling the rotating speed of a screw to be 180-600 rpm, and carrying out melt extrusion and granulation to obtain the high-plating-capacity electroplating PC/ABS material.

The electroplating process comprises the steps of coarsening and then cleaning the electroplating PC/ABS material, then adopting a wax remover to remove wax, and exposing metal powder. The exposed metal powder particles become active centers and conductive components, and the function of increasing the plating capacity of the material is achieved.

It is clear to the skilled engineer that the electroplating process is a process by which plastic parts are converted into semi-metallic parts by chemical plating. Before that, the material part is subjected to a series of steps such as coarsening, sensitization-activation, dispergation and the like, and a stable conductive layer is formed on the surface of the material part. If the conductive substance is directly added into the electroplating material, the difficulty of the process operation and the generation of undesirable products can be effectively reduced for the subsequent process. Meanwhile, wax-coated metal powder is creatively added, the conductivity improvement auxiliary agent can prevent the metal from being coarsened and etched in the coarsening liquid, and after coarsening, the wax-removing link is adopted to remove the wax-coated metal powder, so that the metal particles of the core are exposed and become active neutrality for subsequent sensitization activation and chemical plating.

The main innovation point of the invention is that the wax-coated metal powder is added into the electroplating material to prepare the electroplating PC/ABS material with high plating capacity.

Compared with the prior art, the invention has three obvious advantages:

(1) the metal powder has conductivity, so that the deposition amount and the operation time of the chemical nickel can be properly reduced, and the cost in the electroplating process is reduced;

(2) if the chemical plating of some positions of the pre-plated piece is not completed well, the surface of the material can conduct current, so that the phenomenon of plating leakage is not easy to occur;

(3) for the parts with complex structures, particularly the parts with deeper hole grooves, the inside of the hole grooves often appears with the plating leakage, so that the pre-plated parts with metal appearances can not appear to be too obvious even if the non-appearance surfaces leak, and the sensory quality can be effectively improved.

Detailed Description

The present invention will be described in detail with reference to specific examples.

Example 1

placing polycarbonate, SAN, polybutadiene rubber powder, wax-coated aluminum powder and an antioxidant in a high-speed mixer, mixing for 10-20 min to obtain a mixed material, putting the mixed material in a double-screw extruder, controlling the rotating speed of a screw to be 180-600 rpm, and performing melt extrusion and granulation to obtain the high-plating-capacity electroplating PC/ABS material.

The electroplating process of the material of the embodiment comprises the steps of coarsening and then cleaning the electroplated PC/ABS material, then adopting a wax remover to remove wax, and exposing metal powder. The electroplating yield of the prepared electroplated part reaches 90 percent.

The characteristics and application of the electroplating PC/ABS material with high plating capacity of the embodiment are as follows: has higher fluidity and better electroplating binding force, and is suitable for being applied to electroplating pieces such as slender decorative strips and the like.

Comparative example 1

The composition, composition and preparation method of the plated PC/ABS material of this comparative example were substantially the same as those of example 1 except that in this comparative example, aluminum powder was used instead of the wax-coated aluminum powder of example 1. The alloy is electroplated by adopting a conventional electroplating process to be used as an electroplated part, and the electroplating yield of the prepared electroplated part is 80%.

Therefore, the wax coating metal powder is adopted, the wax layer is removed in the electroplating process, the metal powder is exposed, and the electroplating yield can be effectively improved.

Example 2

placing polycarbonate, SAN, polybutadiene rubber powder, wax-coated silver powder and an antioxidant into a high-speed mixer, mixing for 10-20 min to obtain a mixed material, putting the mixed material into a double-screw extruder, controlling the rotating speed of a screw to be 180-600 rpm, and carrying out melt extrusion and granulation to obtain the high-plating-capacity electroplating PC/ABS material.

The characteristics and the application are as follows: the heat-resistant and anti-aging composite material has good heat resistance and aging resistance, and is suitable for parts with high heat resistance requirements, such as engine cover decorative strips, labels and the like.

Example 3

placing polycarbonate, SAN, polybutadiene rubber powder, wax-coated magnesium powder and an antioxidant into a high-speed mixer, mixing for 10-20 min to obtain a mixed material, putting the mixed material into a double-screw extruder, controlling the rotating speed of a screw to be 180-600 rpm, and carrying out melt extrusion and granulation to obtain the high-plating-capacity electroplating PC/ABS material.

The characteristics and the application are as follows: has good strength and fatigue resistance, and is suitable for functional parts such as electroplated inner and outer door handles.

Example 4

placing polycarbonate, SAN, polybutadiene rubber powder, wax-coated gold powder and an antioxidant into a high-speed mixer, mixing for 10-20 min to obtain a mixed material, putting the mixed material into a double-screw extruder, controlling the rotating speed of a screw to be 180-600 rpm, and carrying out melt extrusion and granulation to obtain the high-plating-capacity electroplating PC/ABS material.

The characteristics and the application are as follows: has better heat resistance and strength, and is suitable for being applied to parts with direct sunlight, such as a steering wheel electric plating label and the like.

Example 5

the electroplating PC/ABS material with high plating capacity has good plating capacity and strong electroplating binding force.

Example 6

the high plating capacity electroplating PC/ABS material has good heat resistance and strength, good plating capacity and strong electroplating binding force.

Example 7

The high plating capability electroplated PC/ABS material of this example is substantially the same as example 1, except that the composition of the material in this example is as follows:

example 8

in the above embodiments, the polycarbonate is bisphenol a polycarbonate, the mass content of acrylonitrile in SAN is 24-30%, and the rubber content of polybutadiene rubber powder is 50-60%.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The electroplating PC/ABS material with high plating capacity is characterized by comprising the following components in percentage by weight:

the polycarbonate is bisphenol A polycarbonate with the viscosity average molecular weight of 20000-30000 g/mol;

the viscosity average molecular weight of the SAN is 100000-200000 g/mol, and the mass content of acrylonitrile in the SAN is 24-30%;

the viscosity average molecular weight of the polybutadiene rubber powder is 100000-200000 g/mol, and the rubber content is 50-60%;

the wax-coated metal powder is one or more of aluminum powder, silver powder, palladium powder, gold powder, magnesium powder and nickel powder coated with wax, and the particle size of the metal powder in the wax-coated metal powder is 10-500 mu m.

2. The high plateability electroplated PC/ABS material of claim 1, consisting of the following components in weight percent:

3. the high plating capacity electroplated PC/ABS material of claim 1, wherein said antioxidant is one or a mixture of commercially available antioxidants Irganox1010, Irganox1076 and Irganox 168.

4. The method for preparing a high plating-ability electroplated PC/ABS material as claimed in claim 1, comprising the steps of:

5. The use of the high overplating ability electroplated PC/ABS material of claim 1, wherein said electroplated PC/ABS material is electroplated for use as an electroplated part, said electroplating process comprising the steps of roughening and cleaning said electroplated PC/ABS material, and then dewaxing with a dewaxing agent to expose metal powder.