JP2003073651A - Hydrophilizing agent and hydrophilizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrophilizing agent which can clean the surface of a base material, at the same time enables a hydrophilic particle to be adsorbed to the surface of the base material so as to maintain the hydrophilizing effect for a long time, and can be removed by dry wiping without washing with water. SOLUTION: The hydrophilizing agent is prepared by adding a solid particle having a particle size of 0.5 micron or more to a liquid colloidal suspension of a hydrophilic particle having a particle size of 0.050-0.5 micron, and is dry- wiped after coating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for cleaning the surface of a base material and at the same time performing a hydrophilic treatment.

[0002]

2. Description of the Related Art As an example of a conventional method for making a substrate hydrophilic, there is known a method in which when a substrate is hydrophilic, a contaminated substrate surface is polished to restore the substrate surface to its original hydrophilicity. ing. On the other hand, there is also known a method in which after cleaning the surface of the base material, a surface active agent, a hydrophilic resin, or the like is further applied to make the surface hydrophilic.

[0003]

However, in the method of making the surface of the substrate hydrophilic by polishing, the work such as washing with water is indispensable to remove the abrasive remaining on the surface of the substrate. On the other hand, in the method of hydrophilizing by applying a surfactant or hydrophilic resin, a cleaning step is often required as a pretreatment, which is complicated, and the surfactant or hydrophilicity may be increased with rainwater over time. There is a problem that the effect of hydrophilization is short because the resin or the like is eluted. Therefore, as a method for solving the above problem, Japanese Patent Application No. 2001-109701
No. 1 has a particle size of 0.010 micron or more and 1
Hydrophilizing agents are disclosed which are characterized in that they contain only submicron particles. However, this hydrophilizing agent has too large an adsorption force of particles on the surface of the substrate,
There was a problem that the removal efficiency was poor when trying to remove by dry wiping without washing with water.

The present invention has been made by paying attention to the problems existing in the prior art as described above. Its purpose is to make it possible to clean the surface of the base material and at the same time maintain the hydrophilic effect by adsorbing hydrophilic particles on the surface of the base material for a long period of time. To provide.

[0005]

In order to achieve the above object, the hydrophilizing agent according to claim 1 has a particle size of 0.05.
It is a hydrophilizing agent characterized by further adding solid particles having a particle diameter of 0.5 micron or more to a colloidal dispersion of hydrophilic particles having a diameter of more than 0 micron and 0.5 micron or less.

A second aspect of the present invention is the method of applying the hydrophilic agent according to the first aspect, characterized in that the hydrophilic agent is dried and wiped after the application.

Therefore, the hydrophilic agent and the method for applying the hydrophilic agent of the present invention can clean the surface of the base material and at the same time,
By adsorbing the hydrophilic particles on the surface of the base material, the hydrophilic effect can be maintained for a long period of time, and can be removed by dry wiping without washing with water.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments embodying the present invention will be described in detail below. The hydrophilizing agent of the present invention can be used for glass, mirrors, enamel, ceramic products and the like. The surface of the base material to be hydrophilized is hydrophobized by adhesion of oil stains or the like under normal use conditions. The hydrophilizing agent of the present invention can perform hydrophilizing treatment at the same time as cleaning the surface of the substrate.

As the method for applying the hydrophilizing agent of the present invention, the hydrophilizing agent can be sprayed on the surface of the substrate, or can be applied by impregnating it with a cloth, a non-woven fabric, a sponge or the like in advance. During the coating operation, oil stains and the like adhering to the surface of the base material include hydrophilic particles having a particle size of more than 0.050 micron and 0.5 micron or less, and a particle size of 0, which is included in the hydrophilizing agent of the present invention. It is peeled off from the surface of the substrate by rubbing it with solid particles of 0.5 microns or more.

In the conventional method, it was necessary to remove particles containing oil stains by washing with water after coating.
However, the hydrophilizing agent of the present invention contains hydrophilic particles having a particle size exceeding 0.050 micron and having a particle size within a specific range of 0.5 micron or less,
It can be removed by dry wiping without washing with water. Furthermore, by adding solid particles having a particle diameter of 0.5 micron or more, the removability of particles can be further enhanced and the efficiency of the removal operation can be improved.

A trace amount of hydrophilic particles is adsorbed on the surface of the base material from which the dirt has been removed without being removed. Since the surfaces of these particles have extremely high hydrophilicity, the surface of the base material on which the hydrophilic particles are adsorbed can be made more hydrophilic. Further, since the adsorbed hydrophilic particles are not easily removed by physical friction or rainwater, the hydrophilic effect can be exerted for a long period of time.

Colloidal dispersions of titania, alumina, silica and silicate are commercially available as colloidal dispersions of hydrophilic particles having a particle size of more than 0.050 micron and 0.5 micron or less used in the present invention. It is convenient to use these.

When the particle diameter of the hydrophilic particles is 0.050 micron or less, the adsorption force of the hydrophilic particles on the surface of the base material is too large, and the efficiency of the removing operation becomes poor. On the other hand, when the particle size exceeds 0.5 micron, the adsorption force of the hydrophilic particles on the surface of the base material is too weak to exert a sufficient hydrophilic effect.

Solid particles having a particle size of 0.5 micron or more used in the present invention include talc, kaolin, mica,
Minerals such as calcium carbonate, zinc white, feldspar, titania, silica, zirconia, silica sand, corundum, alumina, silicon carbide, silicon nitride, carbon durham, diamond, etc.,
Furthermore, organic materials such as resin powder and short fiber powder can also be used. These solid particles can be used alone or in combination according to the intended use. For example, when talc is used, lubricity can be improved, and when resin powder or short fiber powder is used, the surface of the base material is not damaged.

The solid particles used in the present invention have a particle size of 0.
If it is less than 5 microns, the removability of particles adsorbed on the surface of the base material is insufficient. On the other hand, if the particle size is too large, the surface of the base material may be damaged, so the upper limit of the particle size must be taken into consideration according to the hardness and shape of the solid particles.

The present invention is based on the above technical idea and is not limited to the embodiments, but can be carried out or improved as follows. -Adding a surfactant. -Add alcohols, glycols, glycol ethers, hydrocarbons, oxygen-containing hydrocarbons, chlorinated hydrocarbons, etc. as solvents and humectants.・ Use it by soaking it in a non-woven fabric or sponge.・ Use by spraying on the surface of the substrate.・ Auxiliary washing with water followed by dry wiping, or simultaneous wiping with water and dry wiping.・ Apply or remove using a jig such as a rubber spatula.

[0017]

Example 1 As hydrophilic particles, 25% silicadol 30G-100 (Nippon Kagaku Kogyo Co., Ltd., colloidal silica, particle size 0.100 to 0.130 micron, active ingredient 40 wt%), talc LMS- 300 (manufactured by Fuji Talc Industry Co., Ltd., particle size: 1.3 to 1.6 microns) was diluted with pure water so that the hydrophilicity of the present invention was adjusted to be 0.12%. Next, the non-woven fabric was impregnated with the hydrophilizing agent of the present invention prepared by the above method to hydrophilize the glass surface coated with the water repellent. At the beginning of application, the glass surface was repelled by the hydrophilizing agent, but it gradually disappeared, and it was confirmed that the glass surface was sufficiently cleaned. After the applied hydrophilicizing agent was dried, the glass surface was wiped with a dry towel, so that it could be easily removed. When water was sprayed onto the hydrophilized glass surface with a mist, it was confirmed that the water was uniformly spread and the glass surface was hydrophilized. (Comparative Example 1) As a hydrophilic particle, Snowtex 20L
(Nissan Chemical Co., Ltd. colloidal silica particle diameter 0.040-0.050 micron Active ingredient 20-21
wt%) was diluted to 25% with pure water to prepare the hydrophilizing agent of the present invention. Next, the non-woven fabric was impregnated with the hydrophilizing agent of the present invention prepared by the above method to hydrophilize the glass surface coated with the water repellent. At the beginning of application, the glass surface was repelled by the hydrophilizing agent, but it gradually disappeared, and it was confirmed that the glass surface was sufficiently cleaned. Further, after the applied hydrophilic agent was dried, the glass surface was wiped with a dry towel, which could be easily removed and became white and opaque. (Comparative Example 2) Snowtex 20L as hydrophilic particles
(Nissan Chemical Co., Ltd. colloidal silica particle diameter 0.040-0.050 micron Active ingredient 20-21
wt%) and talc LMS-300 (manufactured by Fuji Talc Industry Co., Ltd., particle size: 1.3 to 1.6 microns) are diluted with pure water so as to be 0.12% to adjust the hydrophilizing agent of the present invention. did. Next, the non-woven fabric was impregnated with the hydrophilizing agent of the present invention prepared by the above method to hydrophilize the glass surface coated with the water repellent. At the beginning of application, the glass surface was repelled by the hydrophilizing agent, but it gradually disappeared, and it was confirmed that the glass surface was sufficiently cleaned. After the applied hydrophilicizing agent was dried, the glass surface was wiped with a dry towel, which could be easily removed and became partially white and opaque.

[0018]

The hydrophilic agent according to claim 1 is a colloidal dispersion of hydrophilic particles having a particle size of more than 0.050 micron and 0.5 micron or less, and further having a particle size of 0.5.
It is a hydrophilic agent characterized by adding solid particles of micron or more. Further, in claim 2, the particle size is 0.050.
A hydrophilizing agent characterized by further adding solid particles having a particle size of 0.5 micron or more to a colloidal dispersion of hydrophilic particles having a particle size of more than 0.5 micron and 0.5 micron or less. The method for applying a hydrophilizing agent is characterized in that Therefore, in the hydrophilizing agent and the method for applying the hydrophilizing agent of the present invention, the surface of the base material can be cleaned, and at the same time, the hydrophilic effect is maintained for a long time by adsorbing the hydrophilic particles on the surface of the base material, and the surface is washed with water. It is possible to remove with a dry wipe.

Claims (2)

[Claims] 1. A solid particle having a particle diameter of 0.5 micron or more is further added to a colloidal dispersion of hydrophilic particles having a particle diameter of 0.050 micron or more and 0.5 micron or less. Hydrophilizing agent 2. The method for applying a hydrophilizing agent according to claim 1, wherein the hydrophilizing agent is wiped dry after application.