The current slump in engineering heavy trucks is largely affected by the investment in infrastructure construction and investment in real estate development. Guo Wen Securities analyst Wu Wenyi judged that the growth rate of investment in real estate development will largely determine the demand for engineering heavy trucks this year. Li Gang, deputy general manager of Shanghai Dajin Automobile Sales and Service Co., Ltd., said: "Since the infrastructure projects have been stagnant, many companies have closed down." Since the second half of last year, due to severe real estate regulation, real estate development and investment growth has begun to decline significantly. So far, this regulation has not been significantly relaxed. It is understood that the growth of domestic real estate investment in the first quarter was 23.54%, which was lower than the 27.9% of the previous year.
Polyacrylamide (PAM) is a water-soluble polymer, which is insoluble in most organic solvents, has good flocculating properties, can reduce frictional resistance between liquids, Can be divided into non-ionic, anionic, cationic and amphoteric four types.
When PAM is used for flocculation, it is related to the surface properties of the species being flocculated, especially the potential, viscosity, turbidity, and pH of the suspension. The kinetic potential of the particle surface is the reason for particle inhibition. Can reduce the potential and condense.
Granular polyacrylamide flocculant cannot be directly added to sewage. It must be dissolved in water before use, and its aqueous solution are used to treat sewage.The water in which the particulate polymer is dissolved should be clean. Generally tap water is suitable for formulating polymer solutions. Strong ACID, strong alkali, high salt water is not suitable for preparation. Water at room temperature is ok, no necessary to heat. Dissolution is slow when the water temperature is below 5 ° C. Increasing the water temperature will accelerate the dissolution rate, but above 40 ° C will accelerate the degradation of the polymer and affect the use effect. The solution concentration is recommended to be 0.1% -0.3%.
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The heavy-duty card survey results in May showed that heavy truck sales in May continued to decline month-on-month, and the year-on-year growth rate may reach the level of -40%, which is the same as in April. From the survey respondents' feedback, almost all the respondents were expecting -40% to -50% year-on-year sales in May. Since the beginning of 2011, a series of industrial policy adjustments and the implementation of a number of new regulations have virtually restricted the progress of the medium and heavy truck market. 
According to industry insiders, the government-led investment has been stabilized due to the government's continued efforts to increase fiscal spending. Among them, from January to April, the central project investment was 40.9 billion yuan, a year-on-year decrease of 4.1%, and the decline was 5.6 percentage points smaller than that in the first three months. The investment growth of state-owned and state-controlled companies has also continued to rise since the beginning of this year, rising 8.8% from the beginning of the year. As of January-April, 9.5%, and the measures for steady growth of the government will increase in the second quarter.
Wu Wentao stated that “the current status of real estate development investment determines that the declining trend of engineering heavy trucks may continue in the next two months. However, with the relaxation of monetary policy in the second half of the year, real estate growth will be boosted, and it is expected that The growth rate of development will reach around 16%, coupled with the successive resumption of construction of some key projects and the rapid growth of water conservancy investment, and the annual infrastructure investment will also be expected to achieve low-speed growth. Driven by these factors, engineering heavy trucks will Half a year passed the low point, which led to the steady recovery of the overall sales volume of heavy trucks, making the trend of the market for the whole year showing a trend of low and high.