Ultrahigh molecular weight polyethylene and preparation method thereof as well as high-temperature-resistant sand grain wax

Abstract

The invention relates to ultrahigh molecular weight polyethylene and a preparation method thereof as well as high-temperature-resistant sand grain wax. The preparation method of the ultrahigh molecular weight polyethylene comprises the following steps: sequentially adding alkoxy aluminum and a catalyst into a reaction kettle type slurry-phase reactor in an inert atmosphere, opening an ethylene feed valve when heating up to 52 DEG C, introducing ethylene, controlling the reaction temperature to be 55-63 DEG C and the reaction pressure to be 0.5-0.7MPa, continuously introducing ethylene, and carrying out a polymerization reaction for 2-2.5h to obtain the ultrahigh molecular weight polyethylene, wherein the ratio of parts by weight of the catalyst to the alkoxy aluminum is equal to 1 to (0.1-0.11). The ultrahigh molecular weight polyethylene powder provided by the invention has a better form and a larger molecular weight; when only 1-3wt% of the ultrahigh molecular weight polyethylene isadded into a coating, a better texture effect can be achieved, and the grains are clear; contrast experiments show that the sand grain wax provided by the invention is lower in adding amount under theconditions of being same in film thickness and obtaining the same texture.

Description

technical field [0001] The invention relates to the technical field of sand grain wax, in particular to an ultra-high molecular weight polyethylene, a preparation method thereof, and a high temperature resistant sand grain wax. Background technique [0002] A texture agent is an additive that can provide a uniform surface texture and a uniform gloss and color to the paint surface. When used, some insoluble or incompatible additives are often added to control the particle size, melt viscosity, and surface tension of the molten surface of the powder, so that the desired texture effect can be achieved. [0003] Textured powder coating is a general term and has different varieties, such as sand grain type, wrinkle type, water grain type and so on. [0004] In the early preparation of sand-textured powder coatings, a large amount of fillers were often added, or the gelation time of the powder was shortened, or the combination of the two. The disadvantages are self-evident, which...

AI Technical Summary

Problems solved by technology

[0004] In the early preparation of sand-textured powder coatings, a large amount of fillers were often added, or the gelation time of the powder was shortened, or the combination of the two. The disadvantages are self-evident, which not only affects the performance, but also brings difficulties to the powder processing.

Now people can obtain different texture effects by adding polyethylene (PE) polymers, but the molecular weight of conventional PE additives is usually low, which seriously affects the addition and use of sanding agents