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Application of plasma surface treatment in plastic and rubber industry

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23 Nov,2020

Application of plasma surface treatment in plastic and rubber industry:

 

Due to the non-polarity of polypropylene, PTFE and other plastic materials, in industrial applications, it will be difficult to bond the surface of some plastic products. In the absence of plasma surface treatment, the printing, bonding, coating and other processes have very poor effect, or even cannot be carried out. Some processes use some chemicals to treat the surface of these rubbers and plastics in the production process, which can change the adhesive effect, but this method is difficult to master, the chemicals themselves are toxic, the operation is very complicated, the cost is high, and the chemicals have an impact on the original excellent properties of rubber and plastics materials. Plasma surface treatment technology is used to treat these materials, so that these materials can play the role of structural surface under the bombardment of high speed and high energy plasma. Meanwhile, an active layer is formed on the surface of the materials to enable rubber and plastic to carry out printing, bonding, coating and other operations.

 

Plasma surface treatment for plastic surface treatment:

 

The study found that most plastics have low surface tension, such as polyethylene (PE) and polypropylene (PP), which have a surface tension of 31 Dyne,The surface tension of polyester (PET) and PVC (PVC) is 39 Dyne,Nylon (PA) is 41 Dyne.

 

In order to meet the requirements of printing and bonding, the surface tension must reach the dyne value of 38, 38, 52, 48, 56 or even higher. Until the invention of off-surface processing machines, many plastic process designs preferred materials, which could meet the requirements of spraying or bonding processes, before the use of such materials, because of the high cost of materials, manufacturing costs have been high. Since the 1980s, with the extensive application of plasma surface treatment, manufacturers began to focus on more plastic varieties, PP, PC, ABS, SMC all kinds of elastomer and a variety of composite materials have also been fully developed. Plasma surface treatment not only solves the adhesion between the same material components, but also solves the adhesion between different material components. In the new process, the traditional surface treatment (such as polishing machine, polishing effect is limited) and environmentally friendly water-based coating treatment (some treatment only about 40mN/m, the material can not be completely wetted) have been impacted. Although fluoride treatment has a good effect, a lot of harmful gases will be produced in the process of use, which often greatly increases the cost of waste gas treatment for manufacturers. Plasma surface treatment is an economical and environmentally friendly surface treatment process, the treated material surface can easily reach 65 because of the surface tension, to meet many high standards of process requirements. It is the use of electromagnetic discharge to produce plasma, jet to the surface of the material, thus greatly improving the surface energy of plastic products.

 

Plasma surface treatment for rubber:

 

Rubber and plastics are non-polar, not under the state of surface treatment, its printing, bonding, coating, and other functions are very poor, or even can not be carried out. In the surface treatment process of some rubber, the use of some chemicals, although it can improve the bonding effect, but this method is complex to operate, chemicals themselves toxic, very careful use, and the purchase cost is high, and the chemicals will destroy the rubber material part of the good performance. Plasma-surface treatment is used for rubber surface treatment, so that these materials can play the role of structural surface to a great extent under the bombardment of high speed and high energy plasma, and at the same time, an activation layer is formed on the surface of the material, so that rubber can be used for printing, bonding, coating and other operations. Using plasma technology to treat rubber surface, simple operation, no harmful substances before and after treatment, good treatment effect, high production efficiency, low operating cost.

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