It was recently learned that in the “three-zone and three-circle†public security environment purification campaign, the Changqing police uncovered a case of selling counterfeit registered trademark goods, arrested criminal suspects, and seized four heating boilers involved, involving a total amount of 1.36 million yuan.
Things have to be said from June 15 this year. At that time, the Zhangxia Police Station of Changqing District received a report. Shaomou Shui, a sales manager of a thermal environmental protection technology company in Jinan, said that in 2014 the company and a certain Tianjin Science and Technology Co., Ltd. A commercial contract for the sale of industrial products (heating boilers) was signed, but Tianjin Science and Technology Co., Ltd. did not perform the contract. Without knowledge of its company, Tianjin Science and Technology Co., Ltd. produced and sold heating products with registered trademarks of its company. Boilers seriously infringe on the company’s trademark rights.
After receiving the report, the Changqing Branch was immediately set up by the Economic Investigation Team and the Zhangxia Police Station to set up a special case for investigation. The task force’s policemen went to Datong City in Shanxi Province twice to investigate and collect evidence, and eventually captured the criminal suspect Zhang Moiping. After trial, Zhang Moping stated that because he felt that the boiler provided by a thermal environmental protection company in Jinan was expensive, he did not perform the contract he had signed before. Instead, he purchased 4 heating boilers from elsewhere, and forged a certain heat from Jinan. The registered sign of Environmental Protection Co., Ltd. was affixed to four boilers and sold to a real estate development company in Datong City, where it profited illegally. At present, the criminal suspect Zhang Mouping has been released on bail pending from the Changqing District Public Security Bureau. The case is under further investigation.
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.
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.
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