JPH0343465A - Coating compound for interior of building structure - Google Patents

Abstract

PURPOSE:To obtain the title coating compound for coating the surface of a wall of art museum, museum, data hall, etc., by blending an emulsion resin-based coating compound having specific pH with an adsorbent having alkali gas adsorptivity. CONSTITUTION:A coating compound consisting essentially of emulsion resin or water-soluble resin having pH3-8 is blended with an adsorbent [preferably Fe(II) ascorbate-based complex or aluminum dihydrogentripolyphosphate-based complex] having alkali gas adsorptivity.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to art museums, museums, and archives (hereinafter referred to as "museums etc.").
That's what it means. ), etc., to prevent the generation of alkaline gas.

[Conventional technology]

Traditionally, alkaline gases generated from the walls of concrete and mortar in newly built art museums, etc., have been harmful to valuable works of art,
It is known to have negative effects on literature, materials, etc., including discoloration. For this reason, newly built museums and other museums are forced to make extremely uneconomical preparations, such as not displaying works of art immediately after construction is completed, and instead operating air conditioning equipment for more than half a year to prepare the exhibition environment before displaying them.

[Problem to be solved by the invention]

In museums, etc., there are many partition walls in addition to walls made of concrete and mortar for their exhibition function, but the paint applied to these partition walls also contains alkaline substances that yellow the paper impregnated with linseed oil. It is known that gas is generated, and this is considered to be one of the negative effects on works of art.

Therefore, when opening a museum, etc., air conditioning equipment must be operated for at least half a year to eliminate the effects of alkaline gas not only from walls such as concrete and mortar, but also from the paint film on partition walls. It won't happen. Therefore, there is a strong demand for paints for building interiors that can be applied to concrete, mortar, and other walls and partition walls, do not generate alkaline gases, and can remove alkaline substances generated from interior materials. It is.

[Means to solve the problem]

In view of this situation, the inventors of the present invention have conducted extensive research and have developed an interior paint that can be painted on the walls of museums and the like. Therefore, the gist of the present invention is characterized in that an adsorbent having an ability to adsorb alkaline gas is contained in a paint mainly composed of an emulsion resin or a water-soluble resin having a pH of 3 to 8. Paint for building interiors.

2. The adsorbent is a Fe (II) ascorbic acid complex. The building interior paint according to claim 1.

3. The building interior paint according to claim 1, wherein the adsorbent is an aluminum dihydrogen tripolyphosphate composite agent.

exists in

Broadly speaking, paint elements can be classified into resins, pigments, solvents, and additives. We then conducted a yellow index test on paper impregnated with linseed oil, and used an elimination method to remove the elements that generate alkaline gas from the paint.

What is the yellow index measurement test using linseed oil impregnated paper?

Place the sample to be measured in an airtight container such as a bottle, hang linseed oil-impregnated paper whose yellow index has been adjusted in advance from the top of the lid, and leave it in a thermostatic chamber at 20°C for 10 days in a sealed state. Measure the yellow index of oil-impregnated paper,
The zero method, which is a method of evaluating the increase in value from the initial value, is
This is a test method adopted by the National Research Institute for Cultural Properties in Tokyo, and the details are described in ``Architectural Knowledge June 1984''.

As a result of this measurement, samples with an increase value of less than 5 were evaluated as having no alkaline gas generation or a very small amount of alkaline gas generation.

As a result, vinyl acetate resins are used as resins, diatomaceous earth pigments, calcium carbonate pigments, talc pigments, and titanium oxide pigments are used as pigments, high boiling point solvents are used as solvents, and antifoaming agents are used as additives, but the yellow index increases. On the other hand, it was found that acrylic resins, stabilizers, preservatives, surfactants, etc. had a large increase in yellow index.

Furthermore, if it is an emulsion resin with a pH of 3 to 8 or a water-soluble resin, an appropriate amount of an adsorbent that adsorbs alkaline gas, such as Fa, (II) ascorbic acid-based composite agent, or dihydrogen aluminum tripolyphosphate-based composite agent, may be added. As a result, it was found that the increase in yellow index can be suppressed to less than 5 not only for vinyl acetate resins but also for resins such as acrylic resins. If the pH is less than 3, for example, F,
e(II) Ascorbic acid-based composite agent is dihydrogen tripolyphosphate, in which Fe (■) and ascorbic acid each exist only in molecular form, and cannot cause a reaction to form complex ions and adsorb alkaline gases. A similar tendency exists when aluminum-based adsorbents are used. Also, pH
If it exceeds 8, the alkaline gas adsorption reaction will not proceed sufficiently, which is not preferable.

Therefore, based on the above findings, pigments and additives that are less likely to cause alkaline gas generation are preferably blended into an emulsion resin with a pH of 3 to 8 or a water-soluble resin, and an appropriate amount of an adsorbent that has alkaline gas adsorption ability is added. This led to the development of an interior paint that prevents the generation of alkaline gas.

[Effect]

By first removing the causes of alkaline gas generation from the elements that make up the paint, and then adding an adsorbent that has the ability to adsorb alkaline gases, the range of resins that can be used has increased. This is important when considering paint formulation, since the results of the linseed oil-impregnated paper test indicate that only vinyl acetate resin could be used.

In other words, the interior paint according to the present invention suppresses the causes of alkaline gas generation as much as possible, so that alkaline gas is not generated from the paint film itself even after it is applied and the film is formed, and the adsorption capacity of the adsorbent is Because it adsorbs alkaline substances such as ammonia generated in the air, it is extremely effective in maintaining the exhibition environment of museums, etc., and can prevent the generation of alkaline gas and eliminate any negative effects on works of art. .

〔Example〕

Examples are given below to provide a more detailed understanding of the present invention.

Naturally, the present invention is not limited to the following examples.

Example 1 40 parts of vinyl acetate emulsion resin, 3 parts of calcium carbonate
0 parts of titanium oxide, 20 parts of titanium oxide, 1 part of antifoaming agent, 9 parts of aluminum dihydrogen tripolyphosphate composite agent, and lead acetate were dispersed using a high-speed stirrer to obtain white water-based interior paint 1 with p and H3. .

Example 2 40 parts of acrylic emulsion resin, 30 parts of calcium carbonate
1 part, 20 parts of titanium oxide, 1 part of antifoaming agent, and 10 parts of Fe (II) ascorbic acid composite agent were dispersed using a high-speed stirrer.
A white aqueous interior paint 2 having a pH of 8 was obtained.

Comparative Example 1 40 parts of acrylic emulsion resin, 40 parts of barium sulfate, 20 parts of titanium oxide, and 1 part of antifoaming agent were dispersed using a high-speed stirrer to obtain a white aqueous interior paint 3 having a pH of 8.

Comparative Example 2 40 parts of acrylic emulsion resin, 30 parts of calcium carbonate
20 parts of titanium oxide, 1 part of an antifoaming agent, 9 parts of an aluminum dihydrogen tripolyphosphate composite agent, and 4 parts of lead acetate were dispersed using a high-speed stirrer to obtain a white aqueous interior paint 4 having a pH of 2.

Comparative Example 3 40 parts of acrylic emulsion resin, 30 parts of calcium carbonate
20 parts of titanium oxide, 20 parts of antifoaming agent, 10 parts of Fa (II) ascorbic acid-based composite agent, and 2 parts of ammonia were dispersed using a high-speed stirrer to obtain a white aqueous interior paint 5 having a pH of 9.

Test method: 20g each of white water-based interior paints 1 to 5 as samples.
Place each in a wide-mouthed glass bottle, hang a piece of linseed oil-impregnated paper with a thread from the top of the bottle, close the lid, and seal the bottle.
It was left in a constant temperature room at ℃ for 10 days. The paper impregnated with linseed oil had its initial yellow index value adjusted to 25 before the start of the test.

Results When the yellowness index of the linseed oil-impregnated paper of each sample was measured after 10 days, the results were as follows: Example 127: +2 from the initial value Example 228: +3 from the initial value Comparative example↓ 78: +53 from the initial value Comparative example 265: +40 from the initial value Comparative example 368 It was +43 from the initial value.

〔Effect of the invention〕

The interior paint of the present invention not only does not generate alkaline gas harmful to works of art from the paint film itself, but also adsorbs alkaline substances such as ammonia present in the air, so it does not emit alkaline gases from concrete, mortar, etc. It has the effect of masking the alkaline gas generated from the partition wall and adsorbing the alkaline gas generated from the partition wall.

Therefore, it is possible to provide an optimal environment for displaying works of art without the presence of alkaline gas, which is absolutely necessary for displaying valuable works of art in museums, etc., and without fear of discoloration of works of art.

Moreover, by applying the interior paint according to the present invention,
Since it is no longer necessary to prepare the exhibition environment by operating air conditioning equipment for more than half a year before the museum opens, as in the past, it can contribute to reducing the construction costs of museums, etc. and shortening the construction period until the museum opens.

Claims (1)

[Scope of Claims] 1. A paint for the interior of a building, characterized in that the paint is mainly composed of an emulsion resin or a water-soluble resin having a pH of 3 to 8 and contains an adsorbent capable of adsorbing alkaline gas. 2. The building interior paint according to claim 1, wherein the adsorbent is a Fe(II) ascorbic acid composite. 3. The building interior paint according to claim 1, wherein the adsorbent is an aluminum dihydrogen tripolyphosphate composite agent.