Casting Polyurethane Prepolymer Casting Polyurethane Prepolymer used for making wheels, Sieve, machinery parts, sealing ring, PU rollers and other elastomers.
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Casting polyurethane prepolymers involves a process where a liquid mixture of polyols and isocyanates is poured into a mold or container and allowed to cure or solidify. This process is commonly used in various industries such as automotive, construction, and manufacturing. Good Wheel Polyurethane Prepolymer,Casting Polyurethane Prepolymer,Casting Pu For Elastomers,Custom Polyether Polyurethane Prepolymer XUCHUAN CHEMICAL(SUZHOU) CO., LTD , https://www.xuchuanpu.com
Here is a step-by-step guide on how to cast polyurethane prepolymers:
1. Prepare the mold: Clean the mold thoroughly and ensure it is free from any debris or contaminants. Apply a mold release agent to facilitate the easy removal of the cured polyurethane.
2. Measure and mix the components: Measure the desired amount of polyol and isocyanate components. The specific ratio will depend on the desired properties of the final product, which can be found in the product's technical data sheet. Pour the measured components into a clean mixing container.
3. Mix the components: Use a mechanical mixer or a high-speed drill with a mixing attachment to thoroughly mix the polyol and isocyanate components together. Make sure to mix for the recommended amount of time specified by the manufacturer to ensure complete homogeneity.
4. Degassing: After mixing, it is important to degas the mixture to remove any trapped air bubbles. This can be done by placing the mixture in a vacuum chamber and applying vacuum pressure for a specified period of time. Alternatively, a vacuum degassing unit can be used.
5. Pouring the mixture: Once the mixture is properly degassed, pour it into the prepared mold or container. Take care to avoid introducing any additional air bubbles during the pouring process.
6. Curing: Allow the poured mixture to cure at room temperature or, if necessary, in a temperature-controlled environment. The curing time will vary depending on the specific polyurethane prepolymer used and the desired hardness or flexibility of the final product. Follow the manufacturer's recommendations for curing time and temperature.
7. Demolding: After the polyurethane has fully cured, carefully remove it from the mold or container. Use caution to prevent any damage to the cured part.
8. Post-curing (optional): Depending on the specific polyurethane prepolymer used, post-curing may be required to optimize the material's properties. This can be done by subjecting the cured part to elevated temperatures for a specific period of time.
It is important to note that casting polyurethane prepolymers requires proper safety precautions, such as wearing appropriate personal protective equipment (PPE) and working in a well-ventilated area. Always follow the manufacturer's instructions and guidelines for handling and working with polyurethane prepolymers.
The jaws of such a jig are mounted vertically on the side walls below the retort screen. According to the direction of movement of the diaphragm, the longitudinal side diaphragm diaphragm jig, which is in line with the direction of movement of the ore stream, is called the lateral side diaphragm jawper perpendicular to the direction of movement of the ore stream. At present, the lateral side diaphragm jawper is commonly used. Since the diaphragm is disposed on the outer side wall of the tank body, it is also called a side-moving outer diaphragm jig. According to the shape of the jigging chamber, it can be divided into a rectangular jig. And trapezoidal jigs. The two types of jigs will be mainly introduced here.
There is also a jig in the middle of the two jigging chambers, also known as a side-moving inner diaphragm jig, such as a Guangdong jig, which is divided into three types, namely, A, B, and C. Although there are some advantages, Due to the cumbersome body, high production accidents, inconvenient maintenance, etc., it is rarely used, so it will not be detailed here.
1. Rectangular jig jib room has a rectangular cross section, which is simpler to manufacture than trapezoidal jig, easy to maintain, flexible in configuration, thicker in processing granularity, larger in processing capacity per unit area, and stable and reliable in operation. The rectangular jig has single row and double row, single row model is LTC-69/2, also known as Jishan-II type, double row model is 2LTG-79/4 and 2LTG-912/4, can be used in stand-alone mode. Can be used in two-machine series (double row and eight rooms). Its main manufacturers are Nanzhong and Zheng Mine. The structure, shape and installation base dimensions of the LTG69/2 jig (ie 600×900 traverse diaphragm jig) produced by Nanzhong are shown in Fig. 1. The technical parameters of the rectangular jig are shown in Table 1.
The rectangular jig has two modes of right-hand and left-type feeding. Figure 1 shows the right-hand feeding. The user should indicate the direction of the ore when ordering.
The large-grip jig developed by Mayuan in 1978 has a structure similar to that of the general double-row laterally-moving jig. Because of the coarser grain size, the combined upper and lower screens are used. The large jig model is AM-30 and its improved LTG-50 and YMT-75. The technical parameters are listed in Table 2.
The Yuba jig produced by Pinggui Machinery Factory and its technical parameters are listed in Table 3.
2. Trapezoidal Jig This is a new type of side-moving diaphragm jig designed and manufactured in China with reference to foreign similar equipment. It was promoted and used in 1966, and its structure is shown in Figure 2. The cross section of the machine is trapezoidal, which is narrowed and widened along the direction of the ore flow, and the slurry flow rate is gradually reduced, which is beneficial to the recovery of fine heavy minerals. The whole machine consists of 8 jigging rooms, divided into two columns, each column of 4 rooms. The strokes and strokes of each room can be adjusted separately to form different jigging systems. The two rows of back to back are bolted together to form a unitary structure; the structure is detachable for easy transportation and relocation. The utility model has the advantages of simple structure, convenient maintenance and reliable operation. The machine has two models (Table 1), which have been widely used in tungsten, tin , iron and manganese re-election plants. The main manufacturer is Ningde.
   figure 1  figure 2    Table 1  Table 2  table 3