Some processes treat these rubber and plastic surfaces with some chemicals, which can change the bonding effect of materials, but this method is not easy to master. Chemicals themselves are toxic, which is troublesome to operate, and the cost is high. Moreover, chemicals also have an impact on the original excellent properties of rubber and plastic materials.
The surfaces of these materials are treated by plasma technology. Under the bombardment of high-speed and high-energy plasma, the structural surface of these materials is maximized, and an active layer is formed on the surface of the materials, so that rubber and plastics can be printed, bonded and coated. The application of plasma technology to rubber and plastic surface treatment is simple, without harmful substances before and after treatment, with good treatment effect, high efficiency and low operating cost. 3. 1. 1 ignition coil
With the development of automobile industry, the requirements for its performance are getting higher and higher. The ignition coil has power improvement, and the most obvious effect is to improve the middle and low speed torque when driving; Eliminate carbon deposition, better protect the engine and prolong the life of the engine; Reduce or eliminate the vibration of the engine; Fuel is fully burned, reducing emissions and many other functions. In order to give full play to the ignition coil, its quality, reliability and service life must meet the standards. However, there are still great problems in the production process of ignition coil at present. After pouring epoxy resin outside the ignition coil frame, the bonding surface between the frame and epoxy resin is unreliable because the frame contains a lot of volatile oil stains on the front of the mold. When the finished product is used, the temperature rises at the moment of ignition, which will produce bubbles in the tiny gaps on the bonding surface and damage the ignition coil, even seriously.
After plasma treatment, the ignition coil skeleton can not only remove non-volatile oil stains 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 wound enameled wire and the skeleton contact. In this way, the performance of the ignition coil in all aspects in the production process is obviously improved, and the reliability and service life are improved.
3. 1.2 engine oil sealing plate
The function of engine crankshaft oil seal is to prevent engine oil from leaking and foreign matter from entering the engine. Crankshaft oil seal is one of the parts of the engine, which is in contact with engine oil at high temperature, so it is necessary to use materials with excellent heat resistance and oil resistance. At present, PTFE materials are widely used in high-end cars. With the continuous improvement of automobile performance requirements, more and more manufacturers gradually use this material, and its application prospect is very broad.
PTFE material has excellent properties such as high temperature resistance, corrosion resistance, non-sticking, self-lubrication, excellent dielectric properties and low friction coefficient. However, the surface activity of untreated PTFE material is poor, and it is very difficult to combine one end with metal, so the product can not meet the quality requirements. In order to solve this technical problem, the surface properties of PTFE bonded to metal must be changed as much as possible without affecting the properties of the other side. Industrial treatment with sodium lysine solution can improve the bonding effect to a certain extent, but it changes the properties of the original PTFE. The experiment shows that the surface activity of PTFE to be bonded is obviously enhanced after plasma bombardment, and the bonding with metal is firm and reliable, which meets the process requirements. On the other hand, the original performance is maintained, and its application is more and more widely recognized.
3. 1.3 Other applications in automobile industry
With the development of economy, consumers have higher and higher requirements for automobile performance, such as appearance, operating 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) Pretreatment of dashboard before flexible polyurethane (PU) coating
(2) The control panel shall be treated before bonding.
(3) Pretreatment of internal PP parts before planting
(4) Handling of sealing strips for automobile doors and windows
The dashboard or control panel that has not been treated before has poor coating effect, is not wear-resistant and is easy to paint off. Although chemical treatment can change the coating effect, it also changes the performance of dashboard and other substrates and reduces their strength. At present, many manufacturers have used plasma technology to treat these substrates. Through plasma bombardment, the micro-activity of the material surface is enhanced, and the coating effect can be obviously improved. According to the experiment, it is known that different technological parameters need to be selected to treat different materials with plasma cleaning machine, so as to achieve better activation effect. 4.2. 1 hard disk plastic parts
With the development of science and technology, the performance of computer hard disk has been improved. The capacity is increasing, the number of disks is increasing, and the speed reaches 7200 rpm, so the requirements for hard disk structure are getting higher and higher. The connection effect between internal components of hard disk directly affects the stability, working reliability and service life of hard disk, thus directly affecting the security of data.
In order to ensure the quality of hard disk, well-known hard disk manufacturers will treat the internal plastic parts before bonding. At present, the widely used plasma treatment technology can effectively clean the oil stains on the surface of plastic parts and increase their surface activity, that is, improve the bonding effect of hard disk parts. Experiments show that the continuous and stable running time of plastic parts treated by plasma in hard disk is significantly increased, and the reliability and anti-collision performance are obviously improved.
Earphone receiver
The coil in the earphone is driven by the signal current, which drives the diaphragm to vibrate continuously. The bonding effect between coil and diaphragm, and between diaphragm and earphone shell directly affects the sound effect and service life of earphone. If they fall off, the sound will be broken, which will seriously affect the sound effect and service life of headphones.
The thickness of the diaphragm is very thin. In order to improve its bonding effect, chemical treatment will directly affect the material of diaphragm, thus affecting the sound effect. Many manufacturers are preparing to treat diaphragms with new technologies, and plasma treatment is one of them. This technology can effectively improve the bonding effect and meet the requirements without changing the membrane material. The experiment shows that the bonding effect between different parts of the earphone produced by plasma cleaning machine treatment is obviously improved, and the phenomenon of broken sound will not appear under long-term high-pitched test, and the service life is also greatly improved.
4.2.3 Mobile phone shell
There are many kinds of mobile phones, and their appearances are colorful and varied. Their colors are bright and their logos are eye-catching. However, everyone who uses mobile phones knows that after a period of use, the shell is easy to lose paint, and even logos becomes blurred, which seriously affects the appearance and image of mobile phones.
In order to find a solution to these problems, well-known mobile phone brand manufacturers have used chemicals to treat the plastic case of mobile phones, and the printing and bonding effect has been improved, but this is at the expense of reducing the hardness of the mobile phone case. In order to find a better solution, plasma technology stands out. Plasma surface treatment technology can not only clean the oil stains left by the shell in the injection molding process, but also activate the surface of the plastic shell to the greatest extent, enhance the combination effect of printing and coating, and make the coating on the shell firmly connected with the substrate. The coating effect is very uniform, the appearance is more beautiful, the wear resistance is greatly enhanced, and there will be no paint grinding phenomenon after long-term use. Aerospace electrical connector
The bonding effect between insulator and conductor sealing body in electrical connectors has been affecting the development of domestic electrical connectors, especially in the aerospace field. The bonding effect between the insulator without surface treatment and the conductor sealing body is very poor, even if the adhesive with special formula is used, the bonding effect can not meet the requirements. In addition, if the adhesion between the insulator and the sealing body is not tight, leakage may occur, so that the withstand voltage value of the electrical connector cannot be improved.
At present, the domestic designated manufacturers of aviation electrical connectors are gradually applying and popularizing plasma cleaning technology to clean the connector surface after technical research. Through plasma cleaning, not only can the surface oil stain be removed, but also the surface activity can be enhanced. In this way, it is very easy and uniform to glue the connector during bonding, which significantly improves the bonding effect. Tested by many domestic manufacturers, the tensile strength and compressive strength of the electrical connector after plasma treatment have been improved several times.
Kevlar fiber treatment
Aramid material is a kind of aramid composite material, which attracts people's attention because of its low density, high strength, good toughness, high temperature resistance and easy processing and molding. Kevlar is called "Armored Guardian" in the military because of its special ability of toughness, wear resistance, combination of rigidity and flexibility and invulnerability.
Kevlar needs to be bonded to other parts after molding, but this material is hydrophobic and difficult to bond. In order to obtain good bonding effect, surface treatment is needed. At present, plasma is mainly used to activate its surface. After treatment, the surface activity of aramid fiber is enhanced and the bonding effect is obviously improved. Through the continuous optimization of plasma treatment process parameters, the effect will be further improved and the application scope will be wider and wider. 6.4. 1 intravenous infusion set
During the use of the infusion needle at the end of the infusion set, when it is pulled out, there will be a phenomenon that the hour table is separated from the needle tube. Once separated, the blood will flow out with the needle tube, which will pose a serious threat to the patient if it is not handled correctly in time. In order to ensure the occurrence of such accidents, it is very necessary to carry out surface treatment on the needle holder. The hole of the needle holder is very small, which is difficult to handle by ordinary methods, and plasma is an ionic gas, which can also effectively handle tiny holes. Activating its surface with plasma can improve its surface activity, improve its bonding strength with the needle tube and ensure that the two will not separate. The following picture shows the surface cleaning and activation treatment of plasma cleaning machine needle holder.
Treatment of catheter
Catheter brings good news to patients who need indwelling catheter and is widely used in clinic. But with the increase of its application, extubation is becoming more and more common. Especially for long-term indwelling catheter, sometimes due to rubber aging, the balloon lumen will be blocked, and forced removal may cause serious complications. In order to prevent the aging of the contact surface between silicone rubber and human body, it is necessary to treat its surface with oxygen plasma. The changes of surface structure, properties and chemical composition of natural latex urinary catheter before and after oxygen plasma treatment were studied by scanning electron microscope (SEM), infrared spectrum (FTIR-ATR) and surface contact angle. The results show that the surface of urinary catheter after oxygen plasma treatment becomes smooth, the surface contact angle decreases from 84 to 67, and no harmful groups are produced on the surface, which indicates that oxygen plasma treatment is an effective surface treatment method.
In addition, silicone rubber can be treated by plasma to increase its surface activity, and then coated with a layer of hydrophobic material which is not easy to age, and the effect is also very good. The excellent performance of non-woven fabrics makes them widely used in medical care, home improvement, clothing, industry and agriculture. According to different needs, non-woven fabrics are treated with flame retardant, singeing, water splashing, anti-skid, antistatic, coating, antibacterial and deodorizing, printing, needle-punching composite treatment between non-woven fabrics and various textiles, and bonding treatment between non-woven fabrics and various materials (plastics, adhesive films, textiles, etc.). ). In order to achieve very good printing, bonding and other effects, it is necessary to carry out surface treatment on non-woven fabrics. Plasma drum cleaning machine is specially used for surface treatment of slender parts such as non-woven cables. The machine has good treatment effect and high efficiency and is suitable for mass production and processing.