A kind of polypropylene composite material and its preparation method and application

Abstract

The invention discloses a polypropylene composite material and its preparation method and application. The polypropylene composite material, in parts by weight, includes components: 10-50 parts of polypropylene resin; 10-40 parts of polyoxymethylene resin ; 1~3 parts of trimethylsilyl trifluoromethanesulfonate; 5~15 parts of starch; 10~20 parts of mica; 20~30 parts of microbeads. In the present invention, polypropylene resin and polyoxymethylene resin are blended to form an alloy, and the incompatibility of the two phases makes the material phase-separated in the internal structure. At the same time, starch, mica and microbeads are added to form a multi-phase structure. The phase structure is more dispersed, which increases the microscopic defects in the material, thereby greatly reducing the elongation at break and deflection of the material, significantly improving the brittleness of the material, and further broadening the application of polypropylene composite materials. It is used in special occasions with high brittleness requirements.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polypropylene composite material and its preparation method and application. Background technique [0002] Pharyngeal swab or nasal swab sampling is currently the main sampling method for nucleic acid detection of the new coronavirus in my country. In order to ensure the accuracy of the test results, there are certain requirements for the material of the sampling swab, and materials that may contain substances that may inactivate certain viruses or inhibit PCR testing and other substances that affect subsequent testing, such as calcium alginate swabs or wooden stick swabs, cannot be used. child and so on. The currently recommended material is polypropylene. [0003] During the sampling process, the swab handle needs to be broken off after sampling to collect the swab head. Under the current situation of the new crown epidemic, the sampling batches of throat swabs o...

AI Technical Summary

Problems solved by technology

In general, when polypropylene is below Tg, the brittleness can be improved by increasing the crystallinity; however, the current polypropylene, which is mainly characterized by high crystallinity, has an elongation at break of more than 15%, which cannot meet the requirements in some special applications. Occasion use

In the prior art, the degradation method is also used to improve the brittleness of the material, that is, by breaking the PP molecular chain, the fluidity is greatly improved, thereby reducing the elongation at break. For example, the MFR of the melt blown material PP is more than 1200g / 10min. The fluidity is excellent, and the elongation at break can be reduced to 8%~10%, but it still does not meet the ideal use requirements, and this method has the problem that it cannot be injected or extruded on a large scale