CPU For Rubber Roller Castor Wheel 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. Pu Casting Gear Wheel,Custom Prepolymer For Wheel,Cpu For Tyres Wheel,Polyether Tdi Prepolymer XUCHUAN CHEMICAL(SUZHOU) CO., LTD , https://www.xuchuanpu.com
I. The export environment continues to deteriorate
According to customs data, in February 2009, China's steel exports only amounted to 1.56 million tons, a year-on-year drop of 62% and a decrease of 18% from the previous month. Monthly export volume was the second lowest since the export of 1.508 million tons in October 2004.
However, the amount of steel orders for the new year is not optimistic. The China Iron and Steel Association recently stated that about 60% of China's steel exports in January were carried forward last year and there were few new contracts signed this year. It is expected that steel exports will fall by 80% this year.
According to monitoring, global steel prices fell sharply in March. In some European markets, CIS sheet prices are the lowest. The comparison of data shows that although prices of all types of steel produced in China have been reduced by several tens of US dollars in the recent month, Chinese steel has no price advantage in the international market, and rebar, wire rod, cold rolling, hot rolling, etc. The Chinese price of the product is no longer the lowest price. Last December, Chinese steel exports to South Korea plummeted by 63.5%, and steel exports to the EU market plummeted by 75%.
Second, the demand market pressure increases
As the volume of steel exports decreased month by month and the price of steel exports fell, China imported 1.09 million tons of steel in February, a year-on-year decrease of 14.7%, and a 25% increase compared with the previous period.
According to data from the China Iron and Steel Association, in the first two months of this year, the domestic daily production of steel was 1,389,700 tons, equivalent to an annual output of 507 million tons of steel. In the absence of a reduction in production capacity, the Lange Steel Index, which indicates the market price of steel products, showed that as of March 20, the steel market price fell by 7.4% year-on-year and was down 6.9% year-on-year. In the third week of March, Lange Steel Network tracked the prices of 30 products of 17 domestic steel products. At present, 9 varieties of 8 products, including high-wire, hot-rolled, cold-plate, etc., have market prices and steel plant cost prices. Inverted phenomenon.
According to China Steel Association, the current steel market price has reached the level of steel prices in 1994.
Since October 2008, domestic iron and steel companies have suffered losses for the entire industry for four consecutive months, and 71 large and medium-sized steel manufacturing enterprises have accumulated losses of 48.8 billion yuan.
3. The devaluation of the U.S. dollar led to the rise in the prices of various risk-avoiding commodities and brought concerns to the price negotiations of imported iron ore.
The devaluation of the U.S. dollar triggered concerns about global inflation. Various types of hedging funds entered the gold, foreign exchange futures, and commodity commodity sectors, which directly contributed to the expected increase in commodity prices. The rebound in commodity prices has also brought obstacles to the negotiation of prices of iron ore hard assets. Despite the sluggish demand market, the inflation expectations triggered by the depreciation of the US dollar impede the domestic iron and steel companies that rely on imported iron ore. Although CISA hopes that the price of Changjiang Association will be reduced by 40% and return to the level of 2007, there are still foreign analysts predicting that the price of Changjiang Association in 2009 will continue to increase by 30% on the basis of the price in 2008. This expectation The only reasonable explanation is to consider the inflation rate caused by the depreciation of the dollar.
From this point of view, the Chinese steel market in 2009 may face the dual pressure of raw material market inflation and consumer market deflation. China Steel Association has stated that due to the firm raw fuel prices, the cost pressure faced by the steel industry will inhibit the space for steel prices to continue to decline. The first half of this year will be the most difficult period for domestic steel companies.
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 tide of the global financial crisis has not receded. The new crisis craze is sweeping. According to a report in the China Economic Times today, the depreciation of the dollar has not improved along with the international economic environment. In 2009, the Chinese steel market may face the dual pressures of raw material market inflation and consumer market deflation.