Mechanical and Optical Properties of Waterborne UV Curing Coating Modified by Silica

Abstract

Silica (SiO 2) was used to modify the waterborne ultraviolet (UV) curing wood coatings, and the waterborne UV curing wood coating was prepared by optimizing the process parameters. The mechanical properties of the waterborne UV curing wood coating (hardness, adhesion and impact strength) and gloss were tested. When the SiO 2 content in the waterborne UV curing wood coating was 3%, the waterborne UV curing wood coatings was drying at 40°C for 30 min in the oven firstly, then irradiated with UV lamp for 1 min, the obtained waterborne UV curing wood coating had good hardness, adhesion and impact strength. However, when SiO 2 content of waterborne UV curing wood coating was more than 3%, the mechanical properties decreased. The gloss test showed that the gloss of waterborne UV curing wood coating was elevated with the decreased content of SiO 2. When the SiO 2 content was higher than 3%, the gloss of waterborne UV curing wood coating exhibited matt.

Trends in Chemical Wood Surface Improvements and Modifications: A Review of the Last Five Years

“…As a general statement, coatings based on inorganic materials such as SiO 2 , TiO 2 , ZnO, and metals seemed like the most durable treatments, with high adhesion and resistance to mechanical (scratches, abrasion, and cutting) and chemical (acids, alkali and organic solvents) deterioration. Similar components and nanocellulose successfully acted as additives in organic coatings to improve their mechanical properties as well [59,60,65,69,75,95,96]. From all the different surface properties presented in this review, superhydrophobicity was the most tested for its performance following degradation.…”

“…After modification with a silane coupling agent (KH-570), a 2% loading of the silica in a waterborne acrylic coating improved the elongation at break (244.72% to 303.06%), tensile strength (32.509 MPa to 48.673 MPa), modulus of elasticity (3.010 MPa to 6.672 MPa), and pencil hardness (1H to 2H) of the resulting coating. Other workers explored the possibilities of these compounds to improve the resistance of wood to decay fungi [91,92], black-stain fungi [93], and photodegradation [94], as well as to improve its mechanical properties [95,96].…”

“…Among them, silica (SiO 2 ) received a particularly high attention as it showed great versatility in terms of properties, usage, and application methods. A first use for silica was as an additive in organic coatings to improve their mechanical properties [90,95] or to create a durable micro-/nanoscale architecture into the coating to reach superhydrophobicity [104]. Similar to the latter, it was also used to create a micro-/nanoscale architecture directly on the wood surface before hydrophobization with very low surface free energy compounds [104,106,111,113,117,118,120,126,128,130,132,133,151].…”