When the loose fibers pass through the anode screen located on the L side of the profile, the profile will pass through the cathode screen. Keep the anode screen voltage higher than the cathode screen voltage Levin -80 1 and y, and in the electric field, the fibers (with polarity) will arrange themselves and accelerate to the profile under the action of the electric field, and vertically rush to the profile surface at a speed of about 1-2 meters per second.
Fibers are automatically embedded in the adhesive-coated surface and bonded in the lowered position. In a typical fiber feeding chamber, a rotating brush is installed to supply fibers to the anode screen. Fibers that have not withered to the rubber surface can be recycled to the feed chamber.
The important control factors of flocking technology are: (1) using suitable adhesive (it must be able to bond with rafters and fibers); (2) use adhesive correctly (3) to remove impurities from recycled fibers; (4) Humidity of power room made by Cunbao; (5) Control the temperature of the electrostatic chamber. A standard production line is about 300-35. (Total 70 1)35 feet long.
The processing efficiency is 30- 100 feet per minute. Belgian flocking technology. New Elastomer Co., Ltd. developed a thermoplastic elastomer alloy (EATPE).
Production technology of flocking profile. EATPE. Flocking process includes the following steps: extruding the profile, painting the primer and cooling to 12. Downward; Dehydration; Coating adhesive and electrostatic flocking; Heating to 250 degrees Fahrenheit and cooling to room temperature; Dehydrated and allowed to stand for seven days (to fully vulcanize).
When using the traditional method, the first step is to extrude the profile. When the profile leaves the extrusion die, it is immediately sprayed with reactive primer mucilage diluted by solvent. At the standard extrusion temperature (370,390 390°F), the solvent quickly volatilizes, making the primer hot melt on the profile.
The primer layer used is very thin, only 2-5 cm. The profile coated with primer slurry is cooled to about 230℃ by water bath. Then the surface is dried by airflow and coated with a layer of one-component polyazoacetate adhesive.
In general, this kind of glue can be vulcanized at a lower temperature. The adhesive can be applied by spraying, brushing or other coating techniques. When the adhesive is coated at about 300F, the solvent in the adhesive quickly volatilizes and the adhesive itself softens, making the fiber easy to implant. EATPE. Flocking technology is basically the same as general thermosetting rubber. Flocking is carried out in an electrostatic chamber. When loose fibers fall from the anode screen, the extruded profile passes through the cathode screen.
In this process, the extruded profile is located about 8 inches below the anode screen, and the voltage control of the anode is 70KV higher than that of the cathode. If two or more series of flocking equipment are used in the production line, it can adapt to rapid production. Then the flocked profile passes through a heating furnace, and when heated to 250F, the adhesive is partially cured.
If the adhesive layer temperature is too high, it is very important to blow cold air under the profile, so as to ensure that the overall temperature of the material does not exceed 2 12F. The suitable heating time in the heating furnace is 2-3 minutes. During this time, although the adhesive layer is not completely cured, it provides enough time to keep the optical fiber in place.
The total loss of 792 nights is to stay at ambient temperature for another 7 days to achieve complete curing. After being heated by a heating furnace, the profile passes through a water bath again to reduce its temperature to ambient temperature, and then is dried by airflow. When the material is left at ambient temperature, it is considered that the adhesive has completely cured.
During parking, the temperature should be kept at 50%. The final curing takes about a week. Working characteristics The flocking production efficiency of EA profile is slightly lower than that of traditional Zanthoxylum bungeanum gum, and the output per minute is less.
The influencing factors are: the shape and volume of the profile, the special glue used, the appropriate amount of glue, the temperature and length of the heating furnace, and the number of flocking equipment put into production. From the existing production, the typical flocking production line of EA materials is 125 to 2 10 feet, which is much shorter than the traditional production line. Also comprises an extruder and auxiliary equipment.
At present, EA profiles with different sections can be produced. These profiles can be used for existing EATPE. Fiber and adhesive production.
In these flocking profiles, the adhesive strength of fibers to EA can meet the same requirements as that of traditional rubber, and they have passed the following qualification tests: (1) fiber migration test. There is only a small amount of fiber migration on the surface of profile. (2) Standard wax peeling test.
Put the side of the flocked profile embedded in the fiber into the melted wax. After cooling, use 180 a- tensile tester. The peeling angle peels the rubber from the flocking surface. Test parked and unpaved samples respectively. The peel strength of EA samples greatly exceeds the required minimum peel strength. The measured value is limited by the tear strength of rubber itself. (3) epoxy resin peeling test. Except for the use of two-component epoxy resin, the other test procedures are the same as the standard wax peeling test. It should also be noted that epoxy resin is only allowed to be coated on optical fiber, and it is not allowed to be coated on adhesive layer or rubber. After the epoxy resin is cured, it is mixed with 90. And 180. The peeling test was carried out when the peeling angle was. The peel strength of EA material once again exceeds the required minimum peel strength, and its performance is very close to that of traditional elastomer. (j) Glass chute test. Under the specified load, the window glass moves back and forth repeatedly along the surface of the corrugated glass guide groove. After the specified number of reciprocating cycles (30,000 times), check the wear of the guide groove. E. the sample has passed the inspection. The test results show that E-8 TPE: has the same performance and appearance quality as traditional rubber. Characteristics of E8 material EA material is mainly used because it has many advantages over traditional rubber in many cases: (1) it is easy to process. In fact, everyone has noticed that it is easier and simpler to process plastics than thermosetting elastomers, especially during extrusion. Although the price per pound of EA material is higher than that of most rubbers, due to the advantages of low density and low processing cost of EA material, the cost of chemical products can finally be saved by O, 30 workers and US$ 00. (2) light weight. As mentioned above, the density of EA material is much lower than that of most traditional rubbers. (3) Size control. Thermoplastic elastomers, including EA materials, have obvious advantages in ruler -d drawing and maintaining high-precision dimensions. The tolerance range can be three times lower than traditional rubber. This allows different tolerances to be used when designing parts. (4) color. Unless you really like black, the color of traditional rubber is limited. EA material can meet the requirements of almost any required color. (5) Durability. EA material has excellent resistance to oxygen, ozone aging and corrosion. In addition, it has excellent fatigue resistance and flexural failure resistance. How the binder used in flocking materials matches the characteristics of EA materials has not been determined. (6)*** extrusion. EA materials can be extruded with other EA elastic supports or other plastics. This can further simplify the processing technology and produce flocking EA composite products with hard upper layer and soft lower layer. Conclusion To sum up, it has been clearly proved that thermoplastic elastomer alloy can completely meet the requirements of automobile use. All the equipment needed for production is easily available in the market. Flocking equipment used for traditional rubber is also suitable for TPE materials, which also proves that TPE materials have many inherent advantages. This paper proves the feasibility of flocking products, and this chemical product is expected to achieve great development in the near future. Translated from. There are some differences in Lei Yumin School translated by Huang Zuchang (continued from page 42), so it is very important to consider its adaptability to various purposes and how to meet the needs of users. It is expected that the demand for precipitated silica will mainly increase in the fields of tires, industrial supplies and silicone rubber. However, as a manufacturer, there must be corresponding and specific countermeasures. The main applications of fumed carbon black are silicone rubber, poly-cool and household, but it is very important to expand its application fields and develop special brands such as low cost and surface treatment. In a word, carbon black reinforced filler must have cost competitiveness and technical ability to survive if it wants to become an international commodity.