Coating with hydrophilic self-cleaning capability and preparation method thereof

Abstract

The invention relates to a coating with hydrophilic self-cleaning capability. The coating comprises the following components in parts by weight: 80-100 parts of a hydrophilic solvent, 0.01-10 parts of a polymer monomer, 0.01-0.5 part of a chain initiator, 0.01-1 part of a silane coupling agent, 0.01-1 part of a photoinitiator and 0-1 part of an antistatic agent, the polymer monomer comprises one or more of ethylene, propylene, vinyl chloride, styrene and derivatives thereof; the polymer monomers are cross-linked, interconnected or polymerized to form a high-molecular polymer with a net structure; the antistatic agent comprises one or more of alkyl quaternary ammonium salt, alkyl phosphorus salt, alkyl phosphonium salt, alkyl sulfonic acid alkali metal salt, alkyl phosphoric acid alkali metal salt, alkyl dithiocarbamic acid alkali metal salt and ethoxylated aliphatic alkylamine. The coating disclosed by the invention has the characteristics of being all-weather, durable and good in light transmission performance.

Description

technical field [0001] The invention relates to a paint, in particular to a paint with hydrophilic self-cleaning ability and a preparation method thereof. Background technique [0002] With the rapid development of the economy, my country's infrastructure is also constantly improving and developing. The cleaning of various skyscrapers, giant stone carvings, large billboards and other buildings has become a huge problem. The traditional manual cleaning method is not only time-consuming Power consumption has extremely high cost, and cleaning work also has great potential safety hazards. In order to overcome these problems, many antifouling coatings applied to the exterior walls of buildings have been developed in recent years. Such antifouling materials can reduce the deposition of pollutants on the surface of buildings and delay the deterioration of exterior walls of buildings to a certain extent. pollute. However, this kind of material is a temporary solution after all. Acc...

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Problems solved by technology

However, this kind of material is a temporary solution after all. According to the current actual application effect feedback, it is found that the common antifouling coatings on the market have the following deficiencies:

[0003] 1. The mechanical strength of the material is not enough: the current anti-fouling materials are basically simple water phase or alcohol phase solutions, which are naturally cured on the surface by spraying or wiping. building exterior surface

This combination is basically simple van der Waals force or hydrogen bonding, with extremely low mechanical strength, and it is difficult to withstand the erosion of long-term natural conditions such as wind, sun, and rain.

This will not only cause functional materials such as superhydrophilic materials and photocatalytic materials in the solution to peel off from the surface of the coating, and gradually make the coating lose its functional effects such as superhydrophilicity and photocatalysis, but also make the coating and substrate The surface of the material is separated, thereby completely losing the coating effect;

[0004] 2. Low photocatalytic performance: the photocatalysts used in current antifouling coatings are basically titanium dioxide, and titanium dioxide does endow the material with photocatalytic performance. To a certain extent, the hydrophilicity of the coating can be improved, but titanium dioxide has extremely high requirements on the dissolution system and particle size. If there is no better dissolution system and smaller particle size, the antifouling material added with titanium dioxide will appear Obvious white flocs, which will directly affect the light transmittance of the coating on a series of substrates such as glass, reducing its applicability, ease of operation and aesthetics

In addition, as a well-studied photocatalyst, titanium dioxide has been criticized for its low photoelectric conversion efficiency and visible light utilization rate. These two shortcomings also limit the application effect of titanium dioxide as a photocatalyst in antifouling materials;

[0005] 3. The ability to remove solid particles is poor: During the period of drought and little rain, wind, sand and dust are the main pollution factors on the surface of buildings, and the particle size is relatively small. Small sand, dust and other solid pollutants are easily adsorbed on the surface of the building under such conditions, and if the rain is not flushed in time, these pollutants will gradually deposit and solidify, and then remain on the surface of the building's outer wall, affecting its appearance

Therefore, traditional antifouling materials are difficult to resist such solid particle pollution in seasons with little rain or in areas where there is a lack of rain.

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