JP2005089670A - Water-based foamable fireproof paint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-based foamable fireproof paint having excellent storage stability. <P>SOLUTION: The water-based foamable fireproof paint 1 contains a synthetic resin emulsion composed of an acid-containing synthetic resin monomer and an ammonium (poly)phosphate and further contains ammonia and/or a weak acid ammonium salt. The synthetic resin emulsion is preferably neutralized with ammonia and/or a weak acid ammonium salt. The pH of the water-based foamable fireproof paint 1 is preferably 7-13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  This invention covers a synthetic resin emulsion among foam-type fireproof paints that are coated with steel materials such as square steel pipe steel and H-shaped steel, which are structural members of buildings, and foam by heat of combustion during a fire to form a heat insulating layer. The present invention relates to a water-based foam fireproof paint used.

As a conventional water-based foam-type fireproof paint, the main component is, in terms of solid content, an organic binder: 5 to 40% by weight, a thermosetting inorganic binder; 5 to 40% by weight, a filler that decomposes and foams; 50% by weight, and these three components are 30% by weight or more of the total weight (for example, see Patent Document 1), and contain melamine-coated ammonium polyphosphate and / or insoluble ammonium polyphosphate using a synthetic resin as a binder. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 10-110121 (pages 2 to 3) JP-A-8-253710 (pages 2 and 3)

In these water-based foam-type fireproof coatings, the contained (poly) ammonium phosphate is hydrolyzed, and the (poly) ammonium phosphate and the synthetic resin emulsion cause a neutralization reaction. There was a problem that it could not be used due to rising. Further, even when a material containing melamine-coated ammonium polyphosphate and / or insoluble ammonium polyphosphate is used, a slight amount of melamine-coated ammonium polyphosphate and / or insoluble ammonium polyphosphate is hydrolyzed. A similar problem was occurring.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a water-based foam-type fireproof paint excellent in storage stability.

  In order to achieve the above object, the invention according to claim 1 is a water-based foamed fireproof paint comprising a synthetic resin emulsion composed of a monomer of an acid-containing synthetic resin and (poly) ammonium phosphate. The gist of the invention is that the refractory paint contains either or both of ammonia and an ammonium salt of a weak acid.

  The gist of the invention described in claim 2 is that, in the invention described in claim 1, the synthetic resin emulsion is neutralized with either or both of ammonia and an ammonium salt of a weak acid.

  The gist of the invention of claim 3 is that, in the invention of claim 1 or claim 2, the pH of the fireproof paint is 7-13.

  According to the water-based foam-type fireproof paint of the invention described in claims 1 to 3, the storage stability of the fireproof paint is excellent.

Hereinafter, embodiments embodying the present invention will be described.
As shown in FIG. 1, the water-based foam fire-resistant paint 1 of the present invention (hereinafter also simply referred to as fire-resistant paint) is accommodated in a metal can 2 as an accommodating container, and a synthetic resin emulsion and

It contains (poly) ammonium phosphate, and its composition is as follows, for example.
As composition of fireproof paint 1,
200 parts by weight of solid content of methyl acrylate / styrene copolymer resin emulsion as synthetic resin emulsion, 200 parts by weight of microencapsulated ammonium polyphosphate as ammonium (poly) phosphate, 100 parts by weight of pentaerythritol as carbonized layer forming agent, foaming 100 parts by weight of melamine as an auxiliary agent, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 1 part by weight of aqueous ammonia as ammonia, 300 parts by weight of water, 1 part by weight of a preservative , 10 parts by weight of pulp fibers as organic fibers, 100 parts by weight of titanium dioxide as a pigment, and 1 part by weight of an antifoaming agent.

The synthetic resin emulsion is composed of a monomer of a synthetic resin containing an acid. Here, the acid means a Lewis acid. A Lewis acid is a substance that accepts an electron pair.
Examples of the monomer of the synthetic resin containing the acid include, for example, vinyl acetate, ethylene vinyl acetate, vinyl propionate, vinyl carboxylate such as vinyl versatate, methyl (meth) acrylate, and ethyl (meth) acrylate. , Acrylic acid such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, acrylonitrile, methacrylonitrile and the like. These may be used alone, or two or more monomers forming these resins may be copolymerized and used.

  The solubility of the (poly) ammonium phosphate in 100 g of water is preferably 5 g or less, more preferably 3 g or less, and most preferably 1 g or less. When in this range, hydrolysis of (poly) ammonium phosphate generates (poly) phosphate ions and ammonium ions, suppressing acid-base reactions between the (poly) phosphate ions and the synthetic resin constituting the synthetic resin emulsion. can do. Therefore, the storage stability of the refractory paint 1 can be improved.

  Examples of the method of adjusting the solubility of (poly) ammonium phosphate in water to the above range include microencapsulation and surface coating with oils and fats. When the solubility of (poly) ammonium phosphate in water exceeds 5 g, the acid-base reaction between the (poly) phosphate ion and the synthetic resin constituting the synthetic resin emulsion cannot be suppressed, and the fire-resistant paint 1 is stored. While stability falls, the water resistance of a coating film falls.

The synthetic resin emulsion is preferably neutralized with either ammonia or ammonium salt of weak acid or both. In the present invention, the weak acid refers to an acid weaker than phosphoric acid.
Suppresses acid-base reaction between (poly) ammonium phosphate and basic components used for neutralization of synthetic resin emulsion by neutralizing synthetic resin emulsion with ammonia or ammonium salt of weak acid can do. The neutralization means that a salt is formed by a reaction between an acid and a base. In addition, neutralization does not necessarily make the aqueous solution neutral.

Examples of the ammonium salts of ammonia and weak acids include aqueous ammonia, ammonium carbonate, ammonium citrate, and ammonium acetate. Among these, it is preferable to use ammonia water.
By using ammonia water, acid-base reaction between (poly) ammonium phosphate and a basic component used for neutralization of the synthetic resin emulsion can be further suppressed.

  The crystal structure of the (poly) ammonium phosphate is preferably 2 type or 5 type. Since the crystal structure is 2 type or 5 type, the solubility in water is smaller than that of the 1 type, 3 type, 4 type and 6 type, so that hydrolysis of (poly) ammonium phosphate can be suppressed.

The refractory paint 1 contains either or both of ammonia and an ammonium salt of a weak acid. By containing either or both of ammonia and an ammonium salt of a weak acid, ammonium ions can be present in the fireproof coating 1.
Therefore, the equilibrium between the (poly) ammonium phosphate, the (poly) phosphate ion and the ammonium ion is biased toward the (poly) ammonium phosphate side, and the hydrolysis of the (poly) ammonium phosphate can be suppressed.

Examples of the ammonium salts of ammonia and weak acids include aqueous ammonia, ammonium carbonate, ammonium citrate, and ammonium acetate.
Among these, it is preferable to use ammonia water. By using ammonia water, in the case of ammonia water, the equilibrium is greatly inclined toward the ammonium ion side, but in the case of the ammonium salt of a weak acid, the balance of the equilibrium toward the ammonium ion side is small compared to the ammonia water. Therefore, the ammonium ion concentration in the refractory paint 1 becomes higher. As a result, hydrolysis of (poly) ammonium phosphate can be further suppressed.

The content of either or both of ammonia and a weak acid ammonium salt in the refractory paint 1 is preferably 0.1 to 5 mol, more preferably 0. 1 mol per 1 mol of the ammonium group in the (poly) ammonium phosphate. 2 to 3 mol, most preferably 0.3 to 2 mol.
When it exists in this range, hydrolysis of (poly) ammonium phosphate can be effectively suppressed. In the case of less than 0.1 mol, the concentration of ammonium ions in the fireproof coating 1 is too low and the (poly) ammonium phosphate is hydrolyzed. On the other hand, when the amount exceeds 5 mol, the concentration of ammonium ions is too high, and ammonia vapor may irritate the eyes and skin of the worker when the fireproof paint 1 is applied.

The pH of the refractory paint 1 is preferably 7-13. When it is in this range, ammonium ions are sufficiently present in the fire-resistant paint 1, and therefore hydrolysis of (poly) ammonium phosphate can be effectively suppressed.
When the pH is less than 7, the amount of ammonium ion added is too small, and the (poly) ammonium phosphate is hydrolyzed to cause an acid-base reaction with the synthetic resin.

  Moreover, when the fireproof paint 1 is accommodated in the metal can 2 as an accommodation container, the corrosion of the metal can 2 becomes remarkable. On the other hand, when the pH exceeds 13, the concentration of ammonium ions is too high, and ammonia vapor may irritate the eyes and skin of the worker when the fireproof coating 1 is applied.

  Melamine may be added to the refractory paint 1 as a foaming aid. By adding melamine, the magnification of foaming due to the heat of combustion during a fire can be increased. In addition, thickeners, antifoaming agents, dispersants, film-forming aids, organic fibers, inorganic fibers, pigments, and the like used in ordinary paints can be added.

The water-based foamed fire-resistant paint 1 configured in this way is accommodated in a metal can 2 as an accommodating container having a bottomed rectangular tube shape. The metal can 2 is sealed by a cover plate 5 provided with a stopper 4 at its end.
In a state where the refractory paint 1 is accommodated in the metal can 2, it is preferable to add water as floating water so as to cover the entire area where the refractory paint 1 comes into contact with the outside air and to seal it.

By adding floating water and sealing, the surface of the refractory paint 1 is prevented from drying, and the ammonia gas released from the refractory paint 1 is dissolved, so that when the metal can 2 is opened, the ammonia gas The possibility of irritating the worker's eyes and skin can be reduced.
The amount of water at this time is preferably 20 to 500 ml, more preferably 30 to 300 ml, and most preferably 50 to 150 ml. When in this range, the surface of the fire-resistant paint 1 is prevented from drying, and the Japan Society for Occupational Health prescribes the concentration of ammonia gas filled in the gap formed by the inner wall 3 of the metal can 2 and the fire-resistant paint 1. Since it can be suppressed to an allowable concentration (25 ppm) or less, irritation to the eyes and skin of the operator can be suppressed.

  When the amount of water is less than 20 ml, the surface of the refractory paint 1 is dried, and the concentration of ammonia gas filled in the gap formed by the inner wall 3 of the metal can 2 and the refractory paint 1 exceeds 25 ppm. May irritate workers' eyes and skin. Conversely, when it exceeds 500 ml, when floating water and the fireproof paint 1 are mixed, the solid content of the fireproof paint 1 is relatively lowered by the floated water, so that the drying property of the fireproof paint 1 is lowered after construction. .

In addition to water, a thickener such as methyl cellulose, an antiseptic, a defrosting agent such as ethylene glycol, and the like may be added to the floating water.
The refractory paint 1 to which the floating water is added is refractory in a state where the floating water and the upper layer portion of the refractory paint 1 are mixed and accommodated in the metal can 2 due to vibration generated during conveyance to a construction site or the like. There may be a gradient in the viscosity of the upper layer portion and the lower layer portion of the paint 1. That is, the upper layer part mixed with floating water has a lower viscosity than the lower layer part.

The fireproof paint 1 accommodated in the metal can 2 is stored in a warehouse or the like. The period from storage in a warehouse or the like to shipment to a construction site or the like is usually 1 to 60 days.
The container is not limited to the metal can 2 and can be arbitrarily set. Plastics such as polypropylene resin, polyethylene resin, polyethylene terephthalate resin, and epoxy resin, porcelain, earthenware, and glass containers may be used.

  Moreover, when using the metal can 2, it is preferable to coat | cover the inner wall 3 with an acid-proof material. Examples of the acid resistant material include polyester resin, resol resin, tetrafluoroethylene resin, tetrafluoroethylene-purple oloalkyl vinyl ether copolymer resin, acrylic resin, vinyl chloride resin, polypropylene resin, polyethylene resin, polyethylene terephthalate resin. , Plastics such as epoxy resin, natural wax such as carnauba wax, candelilla wax, rice wax, ibotarou, sugarken wax, and ceramics.

The fire-resistant coating material 1 adjusted as described above has an acidic region by locally hydrolyzing (poly) ammonium phosphate and neutralizing with ammonium ions, even if the whole is neutral to alkaline. Repeated generation and disappearance.
In order to prevent the locally generated acidic region from reacting with the inner wall 3 of the metal can 2 before disappearing due to the neutralization reaction with ammonium ions, the metal can 2 is prevented from corroding. Is more preferably 8 or more.

Moreover, corrosion of the metal can 2 can be suppressed by covering the inner wall 3 of the metal can 2 with an acid resistant material. In this case, the coating thickness of the acid resistant material is preferably 10 to 300 μm, more preferably 20 to 200 μm, and most preferably 50 to 150 μm.
When it exists in this range, the corrosion of the metal can 2 can be suppressed effectively. When the coating thickness is less than 10 μm, the coating thickness is too thin and the metal can 2 is corroded during long-term storage. On the other hand, when the thickness exceeds 300 μm, the improvement of the corrosion prevention effect due to the increase in the coating thickness is not observed, which is uneconomical. If the coating thickness is too thick, uniform coating becomes difficult.

During storage in a warehouse or the like, the (poly) ammonium phosphate in the composition of the refractory paint 1 gradually hydrolyzes to cause an acid-base reaction with the synthetic resin constituting the synthetic resin emulsion, thereby increasing the viscosity of the refractory paint 1. Change.
However, since there are enough ammonium ions generated from either or both of ammonia and the ammonium salt of the weak acid in the fireproof coating 1, there is a difference between (poly) ammonium phosphate and ammonium ion and (poly) phosphate ion. The equilibrium is biased towards the (poly) ammonium phosphate side.
Therefore, hydrolysis of the (poly) ammonium phosphate is suppressed, and the acid-base reaction with the synthetic resin constituting the synthetic resin emulsion is suppressed.

The temperature when stored in a warehouse or the like is preferably 0 to 35 ° C, more preferably 0 to 25 ° C, and most preferably 0 to 15 ° C. When in this range, the viscosity after storage for 60 days when the viscosity at the time of production of the refractory paint 1 is 100 is in the range of 50 to 300, so that there is no trouble in use at a construction site or the like.
When the storage temperature is less than 0 ° C., the fireproof paint 1 may be frozen. When the temperature exceeds 25 ° C., the volatilization of ammonia gas from the refractory paint 1 becomes significant.

  When the temperature exceeds 35 ° C., the rate of acid-base reaction with the synthetic resin constituting the hydrolyzed ammonium (poly) phosphate synthetic resin emulsion increases. As a result, the viscosity after storage for 60 days when the viscosity at the time of manufacturing the refractory paint 1 is 100 exceeds 300, which causes problems such as inferior workability when used at a construction site or the like.

  When the fireproof paint 1 contains 15 to 25 kg in a metal can 2 having a volume of 18 liters, the fireproof paint 1 contains either a sufficient amount of either ammonia or a weak acid ammonium salt, or both. The concentration of ammonia gas filled in the gap formed by the inner wall 3 of the metal can 2 and the fireproof paint 1 is 5 to 200 ppm.

The refractory paint 1 accommodated in the metal can 2 is shipped to a construction site or the like, and the cover plate 5 of the metal can 2 is opened with a leather skin or the like at the construction site or the like, so The paint 1 is ready to be removed.
After the fire-resistant paint 1 is taken out from the metal can 2, it is applied to a steel material as a structural member of a building by spraying or the like and dried to obtain a fire-resistant coating film. The fire-resistant coating film is foamed 10 to 50 times by the heat of combustion during a fire to form a heat insulating layer. As a result, since the heat conduction to the steel material is suppressed by the heat insulating layer, the collapse of the building can be prevented.

This embodiment can exhibit the following effects.
The fireproof paint 1 contains either or both of ammonia and an ammonium salt of a weak acid, so that the equilibrium between (poly) ammonium phosphate and (poly) phosphate ions and ammonium ions is on the (poly) ammonium phosphate side. Biasing and hydrolysis of (poly) ammonium phosphate can be suppressed. Therefore, it is excellent in storage stability.

  The acid-base reaction between (poly) ammonium phosphate and the basic component used for neutralization of the synthetic resin emulsion is achieved by neutralizing the synthetic resin emulsion with either or both of ammonia and a weak acid ammonium salt. Can be suppressed. Therefore, it is excellent in storage stability.

  -Since the pH of the said fire-resistant paint 1 is 7-13, hydrolysis of (poly) ammonium phosphate can be suppressed effectively. Therefore, it is excellent in storage stability. Moreover, when the storage container is the metal can 2, the corrosion of the metal can 2 can be suppressed.

  -When the solubility of the (poly) ammonium phosphate in 100 g of water is 5 g or less, the acid-base reaction between the (poly) phosphate ion and the synthetic resin constituting the synthetic resin emulsion can be suppressed. Therefore, it is excellent in storage stability.

Hereinafter, examples and comparative examples embodying the embodiment will be described.
In addition, the storage stability test of refractory paint 1 was performed by storing 20 kg of refractory paint 1 immediately after manufacture in a metal can 2 (volume 18 liters) as a storage container and storing it in a thermostatic chamber at 5 ° C. and 35 ° C. for 60 days. This was done by measuring the change in viscosity at 20 ° C. before and after storage. After that, spraying with a ricin gun confirmed the ease of work.

In addition, the said embodiment can also be changed and comprised as follows.
-The application method of the said refractory paint 1 is not restricted to a spray, The application method used for a normal paint can be used. For example, a brush, a roller, a trowel, etc. may be used. Also, a painting machine may be used.

Next, technical ideas other than the invention described in the claims that can be grasped from the embodiment will be described together with their effects.
(1) In the state where the fireproof paint is accommodated in the storage container, water as floating water is added and sealed so as to cover the entire area where the fireproof paint contacts the outside air. Item 4. The water-based foam-type fireproof paint according to any one of Items3.
When comprised in this way, while suppressing that the surface of a fireproof coating material dries, irritation | stimulation with respect to an operator's eyes and skin by ammonia gas can be suppressed.

(2) The aqueous foam-type fireproof paint according to any one of claims 1 to 3 and (1), wherein the ammonia is aqueous ammonia.
When comprised in this way, hydrolysis of (poly) ammonium phosphate can be suppressed more.

(3) The container used for the water-based foamed fire-resistant paint according to any one of claims 1 to 3, and (1) and (2), wherein the inner wall is a metal can coated with an acid-resistant material. container.
When comprised in this way, corrosion of a storage container can be prevented.

  (Example 1) The composition of the fire-resistant coating material 1 of Example 1 is 200 parts by weight of a solid content of methyl acrylate / styrene copolymer resin emulsion as a synthetic resin emulsion, and 200 microencapsulated ammonium polyphosphate as (poly) ammonium phosphate. Parts by weight, 100 parts by weight of pentaerythritol as a carbonized layer forming agent, 100 parts by weight of melamine as a foaming aid, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 1 part by weight of ammonia water (concentration 30% by volume), 300 parts by weight of water, 1 part by weight of preservative, 10 parts by weight of pulp fiber as organic fiber, 100 parts by weight of titanium dioxide as pigment, 1 part by weight of antifoaming agent It is a thing.

At this time, the viscosity of the fireproof paint 1 was 15 Pa · s, and the pH was 9.3. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 20 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 22 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fireproof paint 1 made was 20 ppm was 20 ppm. The spraying work was easy.

  (Example 2) The composition of the fire-resistant coating material 1 of Example 2 is as follows: 200 parts by weight of vinyl acetate resin emulsion solids as a synthetic resin emulsion, 150 parts by weight of ammonium polyphosphate as (poly) ammonium phosphate, as a carbonized layer forming agent 70 parts by weight of dipentaerythritol, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 5 parts by weight of ammonium carbonate as an ammonium salt of a weak acid, 300 parts by weight of water, preservative 1 It is a mixture of parts by weight and 1 part by weight of an antifoaming agent.

At this time, the viscosity of the fire-resistant paint 1 was 28 Pa · s, and the pH was 7.2. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 21 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 70 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of the ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fireproof coating 1 made was 10 ppm. The spraying work was easy.

  (Example 3) The composition of the fire-resistant paint 1 of Example 3 is as follows. The solid content of methyl methacrylate / vinyl acetate copolymer resin emulsion as a synthetic resin emulsion is 200 parts by weight, and microencapsulated ammonium polyphosphate as (poly) ammonium phosphate. 200 parts by weight, 100 parts by weight of pentaerythritol as a carbonized layer forming agent, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, aqueous ammonia (concentration 30% by volume) 2 Part by weight, 300 parts by weight of water, 1 part by weight of a preservative, 100 parts by weight of titanium dioxide as a pigment, and 1 part by weight of an antifoaming agent are mixed.

At this time, the viscosity of the refractory paint 1 was 18 Pa · s and the pH was 10.5. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 22 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 25 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of the ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fireproof paint 1 made was 100 ppm was 100 ppm. Spraying was easy, but my eyes hurt during spraying.

  (Example 4) The composition of the fire-resistant coating material 1 of Example 4 is as follows: 200 parts by weight of solid content of butyl acrylate / 2-ethylhexyl acrylate copolymer resin emulsion as a synthetic resin emulsion, and microencapsulation as (poly) ammonium phosphate 200 parts by weight of ammonium polyphosphate, 100 parts by weight of polypentaerythritol as a carbonized layer forming agent, 100 parts by weight of melamine as a foaming aid, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant Parts, 20 parts by weight of ammonium acetate as an ammonium salt of a weak acid, 300 parts by weight of water, 1 part by weight of a preservative, 100 parts by weight of titanium dioxide as a pigment, and 1 part by weight of an antifoaming agent.

At this time, the viscosity of the fireproof paint 1 was 11 Pa · s, and the pH was 12.0. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 10 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 32 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of the ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fire-resistant paint 1 made was 50 ppm. Spraying was easy, but my eyes turned red during spraying.

  (Example 5) The composition of the fire-resistant paint 1 of Example 5 was as follows: 200 parts by weight of solid content of methyl acrylate / styrene copolymer resin emulsion as a synthetic resin emulsion, 200 of microencapsulated ammonium polyphosphate as (poly) ammonium phosphate Parts by weight, 100 parts by weight of pentaerythritol as a carbonized layer forming agent, 100 parts by weight of melamine as a foaming aid, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 20 parts by weight of ammonia water (concentration 30% by volume), 300 parts by weight of water, 1 part by weight of preservatives, 10 parts by weight of pulp fibers as organic fibers, 100 parts by weight of titanium dioxide as pigments, 1 part by weight of antifoaming agent It is a thing.

At this time, the viscosity of the refractory paint 1 was 15 Pa · s and the pH was 13.7. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 16 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 20 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of the ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fireproof coating 1 made was 280 ppm was 280 ppm. The spraying work was easy, but my eyes hurt during spraying and the work was interrupted.

  (Comparative Example 1) The composition of the fire-resistant paint 1 of Comparative Example 1 was as follows: 200 parts by weight of a solid content of methyl acrylate / styrene copolymer resin emulsion as a synthetic resin emulsion, 200 microencapsulated ammonium polyphosphate as (poly) ammonium phosphate Parts by weight, 100 parts by weight of pentaerythritol as a carbonized layer forming agent, 100 parts by weight of melamine as a foaming aid, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 300 parts by weight of water Part, 1 part by weight of preservative, 10 parts by weight of pulp fiber as organic fiber, 100 parts by weight of titanium dioxide as pigment, and 1 part by weight of antifoaming agent.

At this time, the viscosity of the refractory paint 1 was 15 Pa · s, and the pH was 6.5. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 50 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 70 Pa · s.
Further, rust was generated in the metal can 2, and the concentration of ammonia gas filled in the gap formed by the inner wall 3 of the metal can 2 and the fireproof paint 1 was 2 ppm. It was difficult to perform the spraying work.

  (Comparative Example 2) The composition of the fireproof coating 1 of Comparative Example 2 was as follows: 200 parts by weight of solid content of methyl acrylate / styrene copolymer resin emulsion as a synthetic resin emulsion, 200 microencapsulated ammonium polyphosphate as (poly) ammonium phosphate Parts by weight, 100 parts by weight of pentaerythritol as a carbonized layer forming agent, 100 parts by weight of melamine as a foaming aid, 20 parts by weight of a film-forming aid, 1 part by weight of a thickener, 10 parts by weight of a surfactant, 300 parts by weight of water Part, 1 part by weight of preservative, 10 parts by weight of pulp fiber as organic fiber, 100 parts by weight of titanium dioxide as pigment, 1 part by weight of antifoaming agent, 0.5 part by weight of sodium hydroxide as pH adjuster Is.

The viscosity of the fireproof paint 1 at this time was 15 Pa · s and the pH was 7.5. The fireproof paint 1 obtained in this way was housed in a metal can 2 and stored in a thermostatic chamber.
As a result of the test, the viscosity of the fireproof coating 1 after being stored in a constant temperature room at 5 ° C. was 76 Pa · s, and the viscosity after being stored in a constant temperature room at 35 ° C. was 90 Pa · s.
Moreover, rust did not generate | occur | produce in the metal can 2, and the density | concentration of the ammonia gas with which the space | gap which the inner wall 3 of the metal can 2 and the fireproof paint 1 made was 15 ppm. It was difficult to perform the spraying work.
(Author: Junichi Kato)

Sectional drawing which shows the state which accommodated the fireproof coating in the storage container of embodiment of this invention.

Explanation of symbols

1 Fireproof paint 2 Metal can 3 Inner wall 4 Plug 5 Cover plate

Claims (3)

An aqueous foamed refractory paint containing a synthetic resin emulsion composed of a monomer of a synthetic resin containing an acid and (poly) ammonium phosphate, wherein the refractory paint is either ammonia or an ammonium salt of a weak acid, or both A water-based foam-type fireproof paint characterized by comprising The water-based foam-type fireproof paint according to claim 1, wherein the synthetic resin emulsion is neutralized with one or both of ammonia and a weak acid ammonium salt. The water-based foam-type fireproof paint according to claim 1 or 2, wherein the fireproof paint has a pH of 7 to 13.

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