Method for quickly testing weathering resistance of polypropylene fiber for net cage or fishing gear

Abstract

The invention discloses a method for quickly testing weathering resistance of polypropylene fiber for a net cage or fishing gear, and relates to the test of the weathering resistance of the polypropylene fiber. Aiming at shortening the test time, the method comprises sampling, exposing condition, weathering resistance test, conditioning balance, test box, fiber crystallinity and test of stretching property, and is characterized in that: a sample is selected 40m away from the tail end of fiber; a test program is made under exposing conditions of 4-hour irradiation at a black standard temperature of 63 DEG C and 2-hour condensation at a black standard temperature of 51 DEG C; the sample undergoes conditioning balance at a temperature of between 15 and 21 DEG C and a humidity of between 50 and 70 percent; fluorescent UV lights of the test box are arranged in two lines, and each line includes 4 lights; and the sample undergoes the DSC test by a differential scanning calorimeter to measure the melting heat contents of the sample before and after the test of the weathering resistance, and the crystallinity of the sample is worked out; the sample is stretched at a stretching speed of 360 mm / min until broken, and the line density and the stretching strength of the sample are also measured. The method is used for quickly testing the weathering resistance of the polypropylene fiber for fishing.

Description

Technical field: [0001] The invention relates to a method for detecting the weather resistance of polypropylene fibers used in cages or fishing gear in the technical field of agriculture and aquatic products. Background technique [0002] There are hundreds of manufacturers of polypropylene fibers for cages or fishing gear in my country. Their ropes, mesh and wire products are widely used in the fields of breeding cages, fishing gear, transportation and port handling. The annual demand for polypropylene fibers is The volume is about 350,000 tons; the polypropylene fibers used in cages or fishing gear in the field of aquaculture and fishing include multifilament fibers, split film fibers, flat filaments, and round filaments. In recent years, my country's cage culture and ocean fishing have developed rapidly, and the development of cage culture and ocean fishing has put forward higher requirements for the weather resistance of polypropylene fibers exposed to the atmosphere for ...

AI Technical Summary

Problems solved by technology

[0003] Compared with polyethylene materials, the biggest disadvantage of polypropylene fiber materials is poor weather resistance

There are many manufacturers of polypropylene fiber for net cages or fishing gear in my country, but there is no corresponding national or industry standard. People have been unable to use existing technical means to quickly test its weather resistance for a long time, making it difficult to guarantee its weather resistance. Poor weather resistance Polypropylene fiber material has not only damaged the interests of users of net cages or fishing gear, but also restricted the development of modern fishery. Therefore, the solution to the problem of rapid detection of weather resistance of polypropylene fiber for net cages or fishing gear has become a long-term problem in the prior art. unresolved technical problems

If the weather resistance test under natural environment conditions is used to measure the weather resistance of polypropylene fibers used in net cages or fishing gear, although this is in line with the actual situation in the aquatic industry and can ensure the reliability of the material application, there are two problems in the weather resistance test under natural environment conditions. One obvious defect is that the test period is long, at least 10 months, which cannot catch up with the requirements of fishery production and use. The other is that the test generally uses a single index (residual strength retention rate) to characterize the weather resistance of the sample. This is If it is not very accurate, the most important performance index in the use of polypropylene fiber should be selected for weather resistance testing, and combined with other indicators for multi-index comprehensive evaluation

The defects in the weather resistance test under natural environmental conditions not only bring hidden dangers to fishery production, but also restrict the sustainable and healthy development of fishery

The specific weather resistance test conducted in the laboratory can not only simulate some important factors (such as light, temperature and humidity) in the natural climate, but also shorten the aging test cycle; because the test conditions of the specific weather resistance test conducted in the laboratory can be controlled , the test results have good reproducibility and repeatability; through the specific weather resistance test in a short period of time, it is undoubtedly effective for the research, approximate evaluation or prediction of the weather resistance of polypropylene fibers used in cages or fishing gear. Therefore, simulation can be used To solve this problem, we need to strengthen the specific weather resistance rapid detection method of some important factors in the natural climate, but there is no national or industry standard for the artificial rapid aging detection method of polypropylene fiber used in cages or fishing gear, and there is an urgent need for a method for characterization Rapid test method for weather resistance of polypropylene fiber used in cages or fishing gear

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