Nano anti-fogging agent and preparation method thereof

Abstract

The invention relates to an anti-fogging agent containing nanosilicon dioxide. The anti-fogging agent comprises the following components by mass percent: 50-99% of nanosilicon dioxide hydrosol, 0.02-40% of silane coupling agent, 0.001-30% of surfactant, 0.01-5% of curing accelerator, 0.001-2% of stabilizer, 0-10% of alcohol solvent and 0-10% of inorganic acid. A preparation method of the anti-fogging agent comprises the following steps: stirring and mixing the nanosilicon dioxide hydrosol, the silane coupling agent, the curing accelerator and the stabilizer, and sufficiently reacting; adding a mixture of the surfactant and the alcohol solvent, and stirring for 0.5-4 hours; regulating pH by using the inorganic acid to obtain the nano anti-fogging agent with the pH of 8-10. The anti-fogging agent has a good anti-fogging effect; through addition of the silane coupling agent and the curing accelerator, the anti-fogging agent has better bonding firmness and lasting bonding effect; and the preparation method is simple in process, low in cost and convenient to use.

Description

technical field [0001] The invention relates to an antifogging agent for coating on the surface of base materials including glass, plastic and metal and a preparation method thereof, in particular to an antifogging agent containing nano silicon dioxide and a preparation method thereof. Background technique [0002] Fogging of transparent surfaces brings a lot of inconvenience to people. There are many ways to prevent fogging, but anti-fogging agent is a relatively economical method with low energy consumption and wide application prospects. [0003] The basic principle of anti-fogging agent is to use surfactant as the main component to form a layer of hydrophilic film on the surface of the base material to prevent the generation of fog beads and maintain the transmittance of light. [0004] At present, some methods of making antifogging agents are to directly apply surfactants to the substrate, and more to coat polymer films on the substrate, which include acrylate antifoggi...

AI Technical Summary

Problems solved by technology

[0004] At present, some methods of making antifogging agents are to directly apply surfactants to the substrate, and more to coat polymer films on the substrate, which include acrylate antifogging coatings, organopolysiloxane antifogging agents, Polyoxyethylene polyol antifogging agents, etc., such as U.S. Patent US3212909 discloses a kind of antifogging agent with sodium lauryl sulfonate as the main component; preparation method; European patent EP5244935 discloses a method for realizing anti-fog with a polymer active agent containing a hydroxyl group; however, the anti-fog component in the above-mentioned method lacks effective interaction with the matrix material, resulting in a short duration of anti-fog effect

Chinese patent CN03117059.5 introduces nano titanium dioxide (TiO 2 ) particles, the photocatalytic activity in titanium dioxide will degrade the surface active components in the antifogging agent, which is not conducive to improving the stability and durability of the antifogging agent

Chinese patent 200810099062.7 discloses a method for preparing a silica coating with acidic nano-silica and tetraalkoxysilane Si(OR)4 as components to improve hydrophilicity. It shows anti-fog properties, and at the same time, because a slightly stronger acid promotes the hydrolysis and polymerization of siloxane bonds, the nano-silica particles are easy to agglomerate in the formed network structure with a tendency to gel, resulting in a decrease in stability. In particular, four alkoxysilanes are hydrolyzed under acid catalysis to form chain-like branched silicone polymers. The chain-like silicone polymers have limited interaction with the matrix material, and the absence of surface groups on the chains leads to polymer Lack of toughness and become brittle, making the anti-fog effect of the coating last for a short time