JPH0459877A - Aerosol coating composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an aerosol paint composition used as an aerosol paint in various fields such as household and industrial use.

<Prior art> In general, aerosol paint stock solutions include acrylic resins, alkyd resins, nitrified cotton, etc. as film-forming components, pigments, dyes, plasticizers, etc. are added to these, and these are dissolved and dispersed in a flammable organic solvent. have been used.

Generally speaking, the contents of the paint stock solution include acrylic, alkyd, nitrified cotton, petroleum resin, phthalate resin,
Urethane or the like is used. Pigments include coloring pigments such as titanium white, carbon black, and iron oxide, extender pigments such as calcium carbonate and clay, rust preventive pigments such as Bengara, barium metaborate, and zinc powder, and other pigments such as bar pigments and aluminum pigments. used. As additives, antisettling agents, ultraviolet absorbers, viscosity modifiers, desiccants, plasticizers, etc. are used.

Generally, approximately the same volume of liquefied petroleum gas, dimethyl ether, or a mixture thereof as the aerosol paint stock solution is filled into a container as a propellant, and the container is sealed.

Flammable organic solvents used in paint stock solutions include acetone (flash point -17.8℃, boiling point 56.2℃ or less), methyl ethyl ketone (-6.1℃, 79℃), and ethyl acetate (4.4℃). ℃, 77℃), toluene (5℃, 110℃)
), methyl alcohol (11.1°C, 63.9°C),
Ethyl alcohol (13°C, 78°C), isopropyl alcohol (15°C, 182°C), isobutyl acetate (18°C),
°C, 117.3 °C), butyl acetate (22.2 °C112
7°C), xylene (25°C1110,6°C), isobutyl alcohol (27,8°C1106,8°C),
Methyl isobutyl ketone (2B, 8°C, 115°C),
n-butyl alcohol (28.9°C, 117.7°C),
Propylene glycol monomethyl ether (34,1°
C1120°C), ethylene glycol monoethyl ether (40°C, 135°C), Tsurpetz 100 (4
8°C1161-177°C), mineral spirits (
40.2°C, 149°C), meticello (40.8°C1
123,8°C), celloacetate (51”C1155,7°
C), ethylene glycol motuptyl ether (61℃
, 171°C), diacetone alcohol (64.6°C,
169℃), butylcarpitol () 8℃, 230.6
Various low-boiling point, medium-boiling point, and high-boiling point solvents such as Calpitol (116°C and 1231'C) are blended in consideration of compatibility with the resin used, pigment dispersibility, and coating film formation properties. be done. On the other hand, the propellant used is LPG or dimethyl ether alone or in combination. Aerosol paint is flammable! Since it is a mixture of a solvent and a flammable propellant, it is extremely flammable, and products with reduced flammability are required for household use. For this reason, about 10 years ago, a product was developed that uses trichlorotrifluorethane (Freon 113) instead of a low-boiling point solvent (ethyl acetate, methyl ethyl ketone, etc.) in the paint stock solution, which suppresses the flash point and has low flammability. We were able to provide an aerosol paint to the market (Patent No. 1005146).

However, in July 1989, under the Montreal Convention that regulated the use of fluorocarbons, fluorocarbons 113, along with fluorocarbons 12 and 11, were designated as specified fluorocarbons that harm the ozone layer.
Instead, it became necessary to find a non-flammable solvent that is non-polluting and safe for the human body. In addition, due to the revision of the Fire Service Act, the classification of hazardous substances based on the type of paint, which had previously been designated, has been abolished, and it is now classified based on flash point. However, if the new flammable organic solvent is 40% by weight or less, the flash point is 40°C or higher, and the flammable point is 6.
If the temperature exceeds 0°C, it will be subject to designated combustible materials.

Also, if it does not have a flash point, it is considered a non-hazardous substance.

<Means to solve the problem> Freon 113 cannot be used as it is scheduled to be completely phased out as a substance that causes the destruction of the ozone layer that protects the earth. Therefore, it is necessary to find a nonflammable solvent that can replace Freon 113 as a low boiling point paint solvent.In addition to its nonflammability, it is also necessary to find a nonflammable solvent that can be used as a paint solvent, such as solubility in resins, compatibility with flammable solvents used at the same time, and coating properties when applied. Functions such as film uniformity, no sagging, and safety for the human body are required. As a result of various studies, we found that Freon 123 is nonflammable and
It has been found that it is excellent as an aerosol paint solvent.

That is, according to the present invention, the flammable organic solvent is 20 to 50%
Weight %, nonflammable solvent 2.2-dichloro-1°1.1-)
Refluoroethane (Freon 123) 20-50% by weight,
The above-mentioned problems have been solved by a one-component aerosol coating composition that dries at room temperature and comprises 10 to 60% by weight of solid components such as resins, pigments, and additives.

The selection and formulation of the solvent used in aerosol paints takes into account the compatibility with dimethyl ether, LPG, etc. of the liquefied propellant that is filled in approximately the same volume as the paint concentrate, the dispersibility of the pigment, and the stability within the container. It can be decided.

In addition to the above to obtain an excellent coating film, the selection and selection of solvents are important in order to ensure that the sprayed material is easy to apply and to obtain a good dry coating film.
Quantity is critical. Taking the above points into consideration, it is common to use an appropriate amount of a mixed composition of low boiling point, medium boiling point, and high boiling point.

In the coating composition of the present invention, the mixed organic solvent 20
% or more and 50% or less, it is easiest to apply and a good coating film can be obtained. If it is less than 20% and the solvent composition is mainly composed of a relatively low-boiling point solvent, a considerable amount of solvent will volatilize during injection, resulting in insufficient fluidity of the injection material and a flat coating film. I can't get it. In Comparative Example 1, the amount of solvent was 19%,
The condition of the paint film is poor.

Similarly, if the amount of organic solvent exceeds 50%, the spray particles will be coarse and drip during coating, resulting in poor workability. Similarly, in the case of a paint stock solution in which the solid content of resin/pigment is 10% or less, the viscosity is not high, so it tends to sag, and the dried paint film is extremely thin (1 to 2 μm), so the hiding power is poor and the coating is difficult to coat. Many pinholes occur in the film, making it impossible to obtain a good dry coating. A large solid content means a relatively small amount of solvent, and if the solid content is 60% or more, the sprayed material loses fluidity and adhesion becomes poor.

A comparison of the physical properties of Freon 123 and Freon 113 is shown in Table 1 below.

Table 1 The KB value representing the dissolving ability of Freon 123 is 60, which is approximately twice that of Freon 113, indicating that it has excellent ability to dissolve in various resins, and forms a uniform coating film and fine holes. The surface tension for this is also 15.2, which is 17 for Freon 113.
．． 3 shows an excellent value. The boiling point is 27.
6℃, compared to 47.6℃ for Freon 113.
Since the evaporation temperature is low and the vapor pressure is high, the surface of the coating liquid is covered with the vapor of Freon 123 to suppress ignition, rather than the flammable solvent (preferably with a flash point of 15° C. or higher) mixed at the same time.

If the amount of Freon 123 is less than 20% by weight, it will not be possible to ensure a flash point of the paint stock solution of 40°C or higher and a combustion point of 60°C or higher. First, it has poor workability and poor redispersibility from the viewpoint of storage stability.

Examples and comparative examples of stock solution formulations are shown below in Table 2. However, the flammable solvents shown in the formulation examples may be general solvents used in paints, and are not limited to the examples below. Of course. The proportion of each component is in weight percent.

Comparative Example 1 is 19% flammable solvent and 49% CFC, has a flash point of 40°C or higher, and a combustion point of 60°C or higher, which falls within the range of designated combustibles, but it is not good because of poor storage stability and poor redispersibility. .

Comparative Example 2 uses 35% flammable solvent and 40% CFC.
It contains a large amount of blended solvent with a flash point of 15°C or lower, and the flash point of the mixture is 40°C or lower.

Comparative Example 3 contains 50% or more of flammable solvent and 20% or less of freon, and has a flash point of 40° C. or less.

Comparative Example 4 contains 40% or less of flammable solvent and 50% or more of fluorocarbons, has a flash point of 40°C or higher, and a combustion point of 60°C or higher, which is within the range of designated combustibles, but it has poor storage stability and poor redispersion. .

Example 1 contains 40% or less of flammable solvent and has no flash point or combustion point, making it a non-hazardous material.

Example 2 has a flammable solvent of 40% or less and a flash point of 40°C or higher.
It has a combustion point of 60°C or higher, making it a designated combustible material.

Example 3 is similar to 2.

Example 4 contains 50% flammable solvent, but has no flash point or combustion point, making it a non-hazardous substance.

Examples and comparative examples of aerosol formulations are shown in Table 3.

<Effects of the Invention> As is clear from the results in Table 3, the aerosol coating composition of the present invention preferably contains a flammable organic solvent with a flash point of 15°C or higher, but it is By mixing and using within a range of amounts, it is possible to obtain a paint that has good storage stability, good coating workability, and has no specified combustible material or flash point, and provides a smooth coating film.

Claims (1)

[Claims] Flammable organic solvent 20-50% by weight, nonflammable solvent 202
- A one-component aerosol coating composition that dries at room temperature and comprises 20 to 50% by weight of dichloro-1,1,1-trifluoroethane (Freon 123) and 10 to 60% by weight of solid components such as resins, pigments, and additives.