Polymeric microsphere with core-shell structure polymer for polyester reflective film and preparation method of polymeric microsphere

Abstract

The invention relates to a polymeric microsphere with a core-shell structure polymer for a polyester reflective film. The polymeric microsphere with the core-shell structure polymer comprises an inner core and a hard-core and soft-shell structure which is formed by a shell layer coated at the periphery of the inner core, wherein the ratio of the inner core to the shell of the polymeric microsphere is 1 to (0.08-1) according to the ratio of mass fraction; the glass transition temperature Tg of the inner core of the polymeric microsphere is greater than 130 DEG C; the glass transition temperature Tg of the shell layer is smaller than 75 DEG C; and the particle size of the polymeric microsphere is 0.40-5.0 microns. The polymeric microsphere obtained by a reasonable formula system disclosed by the invention forms the hard-core and soft-shell structure; the particle size of the polymeric microsphere can be accurately controlled and is even; the polymeric microsphere can be easily dispersed in a polyester substrate; the film-forming property in a two-way stretching process is good; the equipment load is reduced; the rupture phenomenon is reduced; the manufacturing cost is reduced; and the production efficiency can be improved; and large-scale industrial production is also facilitated.

Description

technical field [0001] The invention relates to a polymer microsphere with a core-shell structure for a polyester reflective film and a preparation method thereof, belonging to the technical field of polyester reflective films. Background technique [0002] In recent years, polyester reflective films have been widely used in the fields of liquid crystal display reflectors, projection screens, planar light source components, and lighting reflectors. Polyester reflective film is a film with a porous core layer, high reflectivity, high whiteness, low light transmittance, good shading effect, and high strength. It is widely used in liquid crystal display (LCD) reflective film, LED lighting, advertising boxes and other fields. [0003] The white polyester reflective film is formed by co-extrusion and biaxial stretching after adding inorganic particles, incompatible polymer heat stabilizers and light stabilizers to polyester. For example, patent applications US20100086736, EP222...

AI Technical Summary

Problems solved by technology

However, since the film needs to overcome the interfacial adhesion between these particles and the polyester matrix when forming holes, the higher the particle content, the greater the tensile stress required to stretch the film, which is manifested as the overall film formation of the film. Decreased resistance, prone to problems such as large tensile stress and membrane rupture

Conversely, when the amount of incompatible polymer particles or inorganic particles is reduced, the stretched film-forming performance is good, and it is not easy to cause excessive tensile stress and film rupture, but the reflectivity of the reflective film will decrease, and the light transmittance will decrease. Increase

Therefore, the incompatible polymer particles and inorganic particles in the current reflective film increase the difficulty of film formation of the reflective film, thus limiting the reflectivity of the reflective film and the improvement of its production efficiency

Images