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How to prevent PC material from yellowing

Prevent PC material from yellowingCan PC material be used as sloping top?, we can start from the four core dimensions of raw material selection, processing technology, storage environment, and post-processing to target blocking the inducement of yellowing. In the raw materials and pretreatment process, we must first select new PC granules produced by regular manufacturers to avoid using recycled materials or raw materials with excessive impurity levels. The recycled material itself may already have the basis of oxidation yellowing, and impurities will accelerate degradation.

To solve the yellowing problem, try to reduce the injection molding temperature, which helps reduce the degradation of plastic at high temperatures. The yellowing problem may stem from the excessive temperature of the PC material during the drying process or the excessive drying time, causing the material to turn yellow. Check the screw heating temperature, nozzle and hot glue channel settings to ensure that these temperatures are not too high to avoid yellowing of the material.

If conditions such as high temperature and catalysts exist at the same time, the oxidation rate will accelerate, eventually causing the material to turn yellow. To improve the problem of PC materials being prone to yellowing, you can start in two directions: First, add antioxidants and ultraviolet absorbers to the raw materials to inhibit oxidation and ultraviolet damage from the insideCan PC material be used as sloping top?The second is to form a protective film on the surface of the material through surface treatment methods such as coating and coating to isolate the intrusion of oxygen and ultraviolet light.

Generally, yellowing is caused by the yellowing of the material due to high temperature or too long drying time during the drying and drying process of the PC material. The second reason is that the heating temperature of the screw and the nozzle, and the temperature set by the hot glue channel are too high. If it causes yellowing, it is recommended to change the raw materials or reset the temperature after identifying it.

In order to prevent yellowing of PC materials, anti-yellowing additives are usually needed. PC materials, or polycarbonate, are linear carbonated polyesters whose molecular structure alternates with other groups. These groups may be aromatic, aliphatic, or both. Among them, bisphenol A PC is the most widely used product in the industry.

What is the temperature of the flow ball of injection molding pC material?

1. Melt temperature: usually between 240℃ and 280 ℃. The melt temperature of PC material is high, and a relatively high melt temperature is needed to make the melt fully smooth and ensure the molding quality of the product. Mold temperature: usually between 80℃ and 100 ℃. PC material is easy to decompose after being heated, and too high a temperature will lead to the decomposition of the melt, which will degrade the forming quality. Therefore, it is recommended to select the appropriate mold temperature to achieve the best forming effect.

2. The injection molding temperature of PC material is generally 280\~330℃. The following is an explanation about the injection molding temperature of PC material: PC material has excellent impact resistance, heat resistance, weather resistance and good optical properties, so it is widely used in the manufacture of various parts and products. When injecting PC material, the setting of injection temperature is a very important process parameter. Because temperature will affect the plasticization degree and fluidity of PC material, which in turn affects the quality and forming effect of the product.

3. 0 degrees Celsius-320 degrees Celsius. The injection molding temperature of PC material refers to the temperature required to heat it to a fully flowing state, and its temperature is between 260 degrees Celsius and 320 degrees Celsius.

Can ordinary injection molding machines process pc materials?

Yes, PC plastic processing requires higher material temperature and mold temperature (material temperature 280-320 degrees Celsius, mold temperature 80-100 degrees Celsius). Try not to use mold release agent when forming, because the pressure in the PC material is very high, and application of mold release agent will cause local cracking.

To sum up, although ABS+PC can be injected with ordinary injection molding machines, it is necessary to pay attention to factors such as melt glue temperature, mixing ratio and adjustment of injection molding machines to ensure the quality and effect of injection molded parts.

Injection molding of ordinary plastic raw materials like PC material does not have much odor or toxicity, otherwise the world would have long been banned from production. However, some special plastic raw materials need attention. For example, POM materials are easy to crack and produce pungent gas gas. Therefore, the heating time and temperature must be strictly controlled, otherwise it will easily cause explosion. When PVC material is heated, it decomposes to produce halogen gas, which is toxic.

Optimize grounding treatment for equipment and processing: Reliable grounding of metal parts, molds, conveying pipes, etc. of PC material processing equipment (such as injection molding machines and extruders), with resistance less than 10^6Ω to avoid static accumulation. Especially during high-speed extrusion or injection molding, static electricity can easily be generated by friction between the screw, barrel and PC material, and grounding can quickly conduct away the charge.

The glue injection pressure is a subdivision parameter of the injection pressure. It specifically refers to the filling stage when the molten material is pushed from the front end of the barrel to the mold cavity. The pressure applied by the screw (or plunger) only covers the pressure control of the one action of glue injection.

Does pc material turn yellow easily

1. PC material is also polycarbonate materialCan PC material be used as sloping top?, it is indeed easy to turn yellow in many scenesCan PC material be used as sloping top?situation. Its yellowing is mainly related to three factors: high temperature effect: PC material itself is not resistant to high temperatures. Whether the barrel temperature is set too high during injection molding, or the finished product is exposed to a high temperature environment for a long time, the PC molecular chain will be broken and degraded, which in turn causes the material to turn yellow. For example, in daily injection molding processing, if the temperature control is not properly controlled, this problem can easily occur.

2. PC material (polycarbonate) easily turns yellow under certain conditions. Chemical structure and stability PC materials have a relatively complex chemical structure. Its molecular chain contains carbonate groups, etc. Under the influence of some external factors, the molecular chain may change, leading to yellowing. For example, a high temperature and high humidity environment may trigger a degradation reaction of molecular chains, causing the PC material to gradually lose its original stability and the color changes accordingly.

3. PC material does turn yellow, but the speed and extent of yellowing are affected by many factors. Material quality is one of the key factors affecting the yellowing of PC materials. High-quality PC raw materials, such as imported Bayer new materials, are added during the production processCan PC material be used as sloping top?Anti-ultraviolet components are used, which can effectively resist the oxidation of materials by ultraviolet light.

4. The yellowing problem may be caused by the excessive temperature of the PC material during the drying process or the excessive drying time, causing the material to turn yellow. Check the screw heating temperature, nozzle and hot glue channel settings to ensure that these temperatures are not too high to avoid yellowing of the material. If the cause of the problem is determined, the yellowing problem can be solved by replacing the raw materials or resetting the temperature.

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