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Type 202 resin vacuum filling and sealing equipment adopts degassing and mixing separately, and metering pump and quantitative pump system are integrated. The two kinds of materials are degassed by spiral inner lifting film, and the ingredients are automatically metered. After proportioning, online dynamic mixing. According to experts from China Epoxy Resin Industry Association, the vacuum system has a filtering and condensing device, which effectively protects the vacuum pump and is beneficial to environmental protection. Using PLC to automatically control the quantitative potting of materials, resin potting equipment can truly realize potting automation, reduce the intervention of operators and improve the quality of potting products. It is mainly used for vacuum quantitative resin potting of electronic components, such as ignition coils and electronic transformers.
Second, the process
1, material selection
When selecting materials, users can put forward the technical conditions of resin potting materials according to the use environment of automobile ignition coils, and accept the resin materials according to the technical conditions. The problems that need attention are:
1) At present, there are three kinds of resin potting materials used in automobile ignition coils: polyurethane, silicone and epoxy resin. Polyurethane and silicone are both elastomers. According to experts from China Epoxy Resin Industry Association, epoxy resin is the best in terms of potting conditions, equipment conditions, insulation strength, cost and raw material sources.
2) The technical requirements of epoxy resin potting compound for automobile ignition coil require that the cured product has excellent electrical properties. Products must have excellent high and low temperature impact resistance, durability and non-cracking. Specifically, the technical requirements of epoxy resin potting compound for automobile ignition coil are -40 ~ 120℃/h, 400 cycles; The life test is 140℃ environment ≥ 1000 h, and domestic products mainly rely on foreign imports. Japanese Somar company, Swiss Ciba company and American Ther-moset plastic company all have products in this field.
3) Epoxy resin potting compound for motorcycle ignition coil should be able to withstand the peak voltage of 35kV, and the open circuit test lasts for 65438±0min, without breakdown damage and surface discharge. Keep 1h 1 cycle at -40℃ and 80℃, and the temperature change test of ***5 cycles is not damaged. The enhanced durable life is more than 240 hours. Epoxy resin potting compound for motorcycles mainly emphasizes pressure resistance.
4) From the appearance of epoxy resin potting compound, it can be seen that the viscosity of potting compound for automobile ignition coil is relatively high, and when heated to above 1 10℃, the viscosity drops rapidly, and a lot of fillers are added; However, the viscosity of potting compound for motorcycle ignition coil is small, and when heated to 60℃, the viscosity decreases rapidly, and the amount of filler is less.
5) Some simple methods can be used to test the reliability of the resin when purchasing. For example, use disposable paper cups to extract a proper amount of component A of potting material, heat it at a predetermined working temperature for more than 8 hours, and observe the changes of materials in the shed. Automobile potting compound can be heated at 130℃/8h; Motorcycle potting compound can be heated at 80℃/8h. It does not produce a lot of precipitation, and the material with good fluidity is qualified, otherwise it is unqualified. If conditions permit, it can also be made into a solidified circular slice with the thickness of 1 mm, and the compression test can be carried out. The breakdown voltage is
6) Whether there are problems such as cracking, breakdown or expansion is observed through the high and low temperature strengthening durability test and road test of potting products. Experts from China Epoxy Resin Industry Association said that different batches appeared, so it can be judged that the potting materials are unqualified.
Type 202 resin vacuum filling and sealing equipment adopts degassing and mixing separately, and metering pump and quantitative pump system are integrated. The two kinds of materials are degassed by spiral inner lifting film, and the ingredients are automatically metered. After proportioning, online dynamic mixing. According to China Epoxy Resin Industry Association
Step 2 suck
This process is divided into epoxy resin absorption and curing agent absorption. It is suggested to use two-component epoxy resin materials with good consistency of physical properties. In the process of material absorption, epoxy resin and curing agent are respectively sucked into the film degassing tank for film degassing. According to experts from China Epoxy Resin Industry Association, the air intake should be determined according to the output of a single shift and the effective volume of the degassing tank, and the maximum air intake should be based on the effective volume of the degassing tank, and then heated, stirred and degassed at a predetermined temperature. The absorption process of curing agent is exactly the same as that of epoxy resin. Possible problems in this process:
1) When absorbing materials, the viscosity of epoxy resin potting compound, especially for automobiles, will become very high at room temperature, or even cannot flow at all. At this time, the container can be preheated. Heating must be carried out evenly and slowly, otherwise the upper material has not melted, and the bottom material will deteriorate or even burn because of the high temperature, causing losses. It is suggested that the materials should be sent directly to the preheating furnace for preheating.
2) Be very careful when absorbing materials from the degassing tank. If the B-tree is sucked into the curing agent tank or the curing agent is pumped into the resin degassing tank, all materials in the tank must be discharged immediately. Otherwise, once solidified, the degassing tank will be scrapped.
3) After the material suction is completed, the material in the pipeline valve shall be sucked into the degassing tank in time, and no potting material shall be left in the pipeline valve. Experts from China Epoxy Resin Industry Association said that this will make it difficult to absorb the material next time.
4) The vacuum degree of suction should match the suction flow, and it should not be too high. General materials and pipeline valves are preheated, and the vacuum degree is 1 000pa.
5) Don't inhale too much. If the degassing umbrella overflows, it will not play the role of degassing the film.
According to experts, the vacuum system has a filtering and condensing device, which effectively protects the vacuum pump and is conducive to environmental protection. Using PLC to automatically control the quantitative potting of materials, resin potting equipment can truly realize potting automation, reduce the intervention of operators and improve the quality of potting products. It is mainly used for vacuum quantitative resin potting of electronic components, such as ignition coils and electronic transformers.