Matting films prepared from waterborne acrylic/micro‐SiO₂ blends

Abstract

Acrylic resin/micro‐SiO2/polymethyl urea (AC/SiO2/PMU) composites were prepared by physical blends of acrylic resin latex (AC), polymethyl urea resin (PMU), and modified SiO2. The effects of SiO2 and PMU content in the hybrid composites morphology and physical properties were investigated in detail using transmission electron microscopy (TEM), UV‐Vis spectrometry (UV‐Vis), scanning electron microscope (SEM), thermogravimetric analysis (TGA), and contact angle measurement. The results showed that introduction of SiO2 into AC composites could increase the viscosity which caused by gelation and agglomeration of SiO2. The TEM, SEM images, and TGA results indicated that hybrid membranes have phase separation. During the film formation process, a high number of PMU and SiO2 particles of an appropriate size were stranded on the surface of the film to form matting surface. These results highlight the sensitivity of the gloss to the polymer morphology and surface. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41707.

Matt Polyurethane Coating: Correlation of Surface Roughness on Measurement Length and Gloss

“…Especially for matt coatings, these two parameters need more stringent controls [14,15]; scientists and technologists expect matt films to have a very low-gloss surface as well as a micro-scale rough surface, which can impart good transparency and pleasant touch properties. As a result, many of techniques, such as an additional matting agent [16,17] and photopolymerization [18,19], have been widely used to construct rough surface of a coating. However, they are different from the rough surface naturally formed by the film and are limited by the disadvantages of requiring a complicated physical process or a specially designed equipment and formulation.…”

Preparation and performance of epoxy resin permeable bricks for sponge city construction

“…The first stage was the initial temperature, up to ~130°C. There was a very small mass loss in this stage due to the volatile removal and evaporation of absorbed water . The second stage was observed at 150–350°C, which was attributed to slight decomposition of adhesive and release of some small molecules .…”

Improvement in antifouling and separation performance of PVDF hybrid membrane by incorporation of room‐temperature ionic liquids grafted halloysite nanotubes for oil–water separation

“…Hydrophilic modification by incorporating inorganic nanoparticles is considered as an effective approach to improve the antifouling performance of polymer membrane . Several inorganic nanoparticles, such as TiO 2 , SiO 2 , one‐dimensional‐PANI/TiO 2 , copper(I) oxide, phosphorylated TiO 2 ‐SiO 2 particles, and sulfated Y‐doped zirconia particles, have already been introduced into PVDF membranes to improve the hydrophilicity for oily wastewater treatment.…”

“…However, as typical inorganic additives, HNTs are prone to aggregate in membrane matrix or leach out to the coagulation bath during the phase inversion process. Therefore, it is difficult for HNTs to disperse uniformly in membrane matrix, which needs to be overcome urgently . One of the effective methods is to graft chemicals which have good compatibility with organic materials onto the hydrophilic additives, thus enhancing the dispersibility of the hydrophilic additives and developing specific interactions between additives and polymer matrix .…”