Application of plasma technology in rubber and pla

2022-05-26
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Application of plasma technology in rubber and plastics industry

Abstract: This paper introduces the plasma cleaning technology and its action mechanism in rubber and plastics industry, and focuses on the application of plasma technology in solving technical problems and improving product performance in automobile, electronics, national defense, textile and other industries

Abstract:The paper expounds the application of plasma technology about solving technology troubles and increasing products performance in automobile , electronic , nantional defance , weave etc. industry , by introducing plasma cleaning tecnology and its principle in rubber and plastic industry .

plasma cleaning/etching is a relatively new technology, which has been widely used in foreign countries, and is gradually popularized in China, involving more and more fields. Below, we will introduce plasma technology and its application examples in rubber and plastic industry

1. Overview of plasma cleaning principle

plasma is an existing state of matter. Usually, matter exists in three states: solid state, liquid state and gas state, but in some special cases, there is a fourth state, such as the material in the ionosphere in the earth's atmosphere. The following substances exist in the plasma state: electrons in high-speed motion; Neutral atoms, molecules and atomic clusters (free radicals) in the activated state; Ionized atoms and molecules; Unreacted molecules, atoms, etc., but the substance remains electrically neutral as a whole

plasma cleaning/etching technology is a specific application of the special properties of plasma. The plasma generating device of plasma cleaning/etching machine is to set two electrodes in a sealed container to form an electric field, and use a vacuum pump to achieve a certain degree of vacuum. As the gas becomes thinner and thinner, the molecular spacing and the free movement distance of molecules or ions become longer and longer. Under the action of the electric field, they collide to form a plasma. These ions have high activity and their energy is enough to destroy almost all chemical bonds, Cause chemical reaction on any exposed surface, and the plasma of different gases has different chemical properties. For example, the plasma of oxygen has high oxidizability, which can oxidize the photoresist to produce gas, so as to achieve the effect of cleaning; The plasma of corrosive gas has good anisotropy, which can meet the needs of etching. Glow will be emitted when plasma treatment is used, so it is called glow discharge treatment

2. Action mechanism of plasma technology on products in rubber and plastic industry

in industrial application, we found that some rubber and plastic parts are connected on the surface. 1. Standardize the detection requirements and operation technology all over the country; When formulating the situation Certification Rules for large-scale testing equipment used in comprehensive performance testing stations, it will be difficult to bond. This is because rubber and plastic materials such as polypropylene and PTFE have no polarity. The printing, bonding and coating effects of these materials without surface treatment are very poor or even impossible

some processes use some chemicals to treat the rubber and plastic surfaces, which can change the bonding effect of the materials, but this method is not easy to master. The chemicals themselves are toxic, the operation is very troublesome, the cost is also high, and the chemicals also affect the original excellent properties of the rubber and plastic materials

the surface treatment of these materials is carried out by plasma technology. Under the bombardment of high-speed and high-energy plasma, the structural surface of these materials can be maximized, and an active layer is formed on the material surface, so that rubber and plastic can be printed, bonded and coated, as shown in Figure 2. The application of plasma technology to rubber and plastic surface treatment has the advantages of simple operation, no harmful substances before and after treatment, good treatment effect, high efficiency and low operation cost

3. Application of plasma technology in rubber and plastics industry

the application fields of plasma surface treatment technology include rubber, composite materials, glass, cloth, metal, etc., involving all walks of life. In this article, we mainly introduce its specific applications in some industries in the field of rubber and plastics

3.1 application of plasma technology in automobile industry

3.1.1 ignition coil

with the development of automobile industry, its performance requirements in all aspects are higher and higher. The ignition coil has lifting power, and the most obvious effect is to improve the medium and low speed torque when driving; Eliminate carbon deposition, better protect the engine and prolong the service life of the engine; Reduce or eliminate the resonance of the engine; Full combustion of fuel, reducing emissions and many other functions. In order to make the ignition coil play its role fully, its quality, reliability, service life and other requirements must meet the standards. However, there are still great problems in the current production process of ignition coil - after pouring epoxy resin outside the ignition coil skeleton, due to a large amount of volatile oil on the surface of the skeleton before leaving the mold, the bonding between the skeleton and the epoxy resin joint surface is not firm, and the temperature rises at the moment of ignition in the use of finished products, Bubbles will be generated in the tiny gap of the joint surface, which will damage the ignition coil, and in serious cases, explosion will occur

after plasma treatment, the ignition coil skeleton can not only remove the difficult volatile oil stain on the surface, but also greatly improve the surface activity of the skeleton, that is, it can improve the bonding strength between the skeleton and epoxy resin, avoid bubbles, and improve the welding strength between the enameled wire and the skeleton contact after winding. In this way, the performance of the ignition coil in all aspects of the production process has been significantly improved, and the reliability and service life have been improved

3.1.2 engine oil seal

the crankshaft oil seal of the experimental engine usually needs to prevent the engine oil from leaking from the engine and prevent foreign matters from entering the engine. Crankshaft oil seal is one of the parts of engine. It contacts with engine oil at high temperature, so it needs to use materials with excellent heat resistance and oil resistance. At present, polytetrafluoroethylene is widely used in high-end cars. With the continuous improvement of automobile performance requirements, more and more manufacturers have gradually used the material, and its application prospect is very wide

polytetrafluoroethylene material has excellent properties in all aspects, high temperature resistance, corrosion resistance, non adhesion, self lubrication, excellent dielectric properties and low friction coefficient. However, the surface activity of untreated PTFE material is poor, the bonding between one end and metal is very difficult, and the product cannot meet the quality requirements. In order to solve this technical problem, we should try to change the surface properties of PTFE (polytetrafluoroethylene) bonding with metal without affecting the properties of the other side. In industry, the treatment with sodium silicate solution can improve the bonding effect to a certain extent, but it changes the properties of the original PTFE. Experiments show that after bombarding the PTFE surface to be bonded with plasma, its surface activity is significantly enhanced, the bonding with metal is firm and reliable, which meets the requirements of the process, while the other side maintains its original performance, and its application is more and more widely recognized

3.1.3 application in other aspects of automobile industry

with the development of economy, consumers have higher and higher requirements for automobile performance, such as automobile appearance, operation comfort, reliability and durability. In order to meet the requirements of consumers, automobile manufacturers pay more attention to the optimization and improvement of details when producing automobiles, such as

(1) the treatment of instrument panel before flexible polyurethane (PU) coating

(2) the treatment of control panel before bonding

(3) the treatment of internal PP parts

(4) the treatment of automobile door and window seals

the coating effect of instrument panel or control panel is very poor and not wear-resistant, It is easy to drop paint and other phenomena. Although chemical treatment can change the coating effect, it also changes the performance of base materials such as instrument panel and reduces its strength. At present, many manufacturers have used plasma technology to treat these substrates. Through plasma bombardment, the activity of the micro level of the material surface is enhanced, which can significantly improve the coating effect. According to the experiment, different process parameters need to be selected to treat different materials with plasma cleaning machine in order to achieve better activation effect

3.2 application of plasma technology in electronic industry

3.2.1 plastic parts of hard disk

with the development of science and the continuous progress of technology, the performance of computer hard disk is also continuously improved, its capacity is increasing, the number of discs is increasing, and the rotating speed is as high as 7200 rpm, which has higher and higher requirements on the structure of hard disk. The connection effect between internal components of hard disk directly affects the stability, working reliability and service life of hard disk, These factors are directly related to the security of data

in order to ensure the quality of hard disk, well-known hard disk manufacturers carry out various treatments for internal plastic parts before bonding. At present, plasma treatment technology is widely used. Using this technology can effectively clean the oil stain on the surface of plastic parts and increase its surface activity, that is, it can improve the bonding effect of hard disk parts. Experiments show that the plastic parts treated by plasma in the hard disk have a significant increase in continuous and stable operation time, and the reliability and anti-collision performance have been significantly improved. The picture shows a photo of a company's hard disk plastic parts processed in a plasma cleaner

3.2.2 earphone earpiece

the coil in the earphone drives the diaphragm to vibrate constantly under the drive of signal current. The bonding effect between the coil, diaphragm and the earphone shell directly affects the sound effect and service life of the earphone. If they fall off, they will produce broken sound, which will seriously affect the sound effect and service life of the earphone

the thickness of diaphragm is very thin. To improve its bonding effect, use chemical treatment, which will directly affect the material of diaphragm and thus affect the sound effect. Many manufacturers are preparing to use new technologies to treat the diaphragm, and plasma treatment is one of them. This technology can effectively improve the bonding effect, meet the needs, and do not change the material of the diaphragm. Through experiments, the bonding effect between various parts of the earphone produced by plasma cleaning machine is significantly improved, and there will be no sound breaking under long-time treble test, and the service life is also greatly improved

3.2.3 the shell

has a wide variety and colorful appearance. Its color is bright and the logo is eye-catching. However, users know that after using for a period of time, the shell is easy to fall off paint, and even the logo becomes blurred, which seriously affects the appearance and image of the

in order to find a solution to these problems, famous brand manufacturers have used chemicals to treat the plastic shell, and the printing and bonding effect has been improved, but this is at the cost of reducing the hardness of the shell. In order to find a better solution, plasma technology has emerged. Plasma surface treatment technology can not only clean the oil stain left by the shell during injection molding, but also activate the plastic shell surface to the greatest extent and enhance its printing, coating and other bonding effects, so that the coating on the shell is firmly connected with the substrate, the coating effect is very uniform, the appearance is more beautiful, and the wear resistance is greatly enhanced, and there will be no paint grinding phenomenon after long-term use

3.3 application of plasma technology in national defense industry

3.3.1 aerospace electrical connector

the bonding effect between insulator and sealing body in electrical connector has always affected the development of domestic electrical connector, especially in aerospaceV Shape Jaw
HCW125 Cutting Machine
astm d638 testing machine
Manual Sample Notching Machine
Metal Wire Torsion Tester

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