According to the survey, the tensile yield strength of about half of the PVC pipes currently on the market cannot meet the relevant standards, and even the tensile yield strength of some manufacturers' PVC pipes cannot reach half of the specified standards. In general, for PVC pipes, the tensile breaking strength is less than the tensile yield. However, some PVC pipes under investigation, due to excessive calcium carbonate added in the production process, were found in the inspection. These PVC pipes did not deform as they should, but there was a fracture between them. According to relevant standards, the tensile yield strength of drainage PVC pipes should reach 40 MPa. However, in the investigation and testing, it was found that the tensile yield strength of some PVC pipes on the market is only about 20 MPa. When it is put into production and construction, there will be breakage and damage, which will affect people's normal production and life. As the key manifestation of the mechanical properties of the pipe, the tensile yield strength is the basic response to the strength of the PVC pipe. When the filling amount is maintained within a certain range, the tensile yield strength of the pipe hardly changes, but when the filling amount is large, the process of stretching the pipe will cause separation between the matrix and the filler. This separation can lead to the formation of cavities, which break when the area of the cavities is large, which is why the tube breaks without being stretched. Under normal circumstances, we add a certain amount of filler to the pipe during the production process, so that the pipe can have greater impact resistance and tensile yield strength, but the use of a large amount of filler will affect the overall performance of the pipe. make an impact. In order to obtain more economic benefits, enterprises should try their best to compress costs and save energy, so as to add a lot of fillers in the production of pipes. Therefore, we need to conduct further research on how to improve the quality of pipes when adding fillers.
