JP2009074058A - Aldehyde scavenger and building material using the same - Google Patents

Abstract

An aqueous aldehyde scavenger capable of maintaining an excellent aldehyde scavenging effect over a long period of time and a building material in which the release of aldehydes is suppressed are provided.
A building material obtained by molding and curing an aldehyde scavenger comprising an aqueous composition containing polyamidoamine, bisulfite, and urea by attaching a binder whose main component is an aldehyde condensable thermosetting resin. In addition, 0.05 to 10 g / m ^{2 of} solid content is adhered to the surface area of the building material.
[Selection figure] None

Description

  The present invention relates to an aldehyde scavenger having an excellent aldehyde scavenging effect over a long period of time, and a building material in which the release of aldehydes is suppressed.

  In recent years, high heat insulation and high airtightness of residential buildings have been recommended from the viewpoint of energy saving. On the other hand, the living environment is being damaged by volatile organic compounds (VOC) released from organic materials used for building materials.

  In particular, aldehyde-condensable thermosetting resins used in building materials such as structural plywood, furniture, building material paints, adhesives, and inorganic fiber heat-absorbing and sound-absorbing materials contain a large amount of formaldehyde, the causative agent of “sick house syndrome”. In some cases, it was released.

  Therefore, in order to maintain a comfortable housing environment, it is particularly required to suppress the emission of formaldehyde. For example, an attempt has been made to change the design of an organic material used for a building material to an organic material that hardly diffuses formaldehyde. However, it is difficult to find performance equivalent to that of aldehyde-condensable thermosetting resins, and there are problems such as increased material prices and changes in processing equipment, and it is difficult to find organic materials that can replace aldehyde-condensable thermosetting resins. there were.

  Attempts have also been made to suppress the emission of formaldehyde released from building materials, and various proposals have been made on formaldehyde scavengers used to trap formaldehyde released from building materials.

For example, in the following Patent Document 1, the total amine value is 100 mgKOH / g or more and the solubility in water is less than 50 g / liter at 25 ° C. and two or more hydroxyl groups that are liquid at 25 ° C. There is disclosed a formaldehyde scavenger comprising a composition obtained by mixing with a polyol having it.
Japanese Patent Laid-Open No. 2007-9003

  Polyamidoamine has a high scavenging effect on aldehydes, but has low solubility in water, and when polyamidoamine is dispersed or dissolved in water, it tends to be clouded or gelled. For this reason, in Patent Document 1, polyamidoamine is mixed with polyol and used.

  However, when a polyol is used, the viscosity of the solution increases and viscosity is generated. For this reason, the aldehyde scavenger may not sufficiently penetrate into the building material, and a sufficient aldehyde scavenging effect may not be obtained. In addition, there is a problem that stickiness tends to remain on the surface of the building material, and adhesion with a skin material such as a film is impaired, or dirt around the surface adheres to it.

  Accordingly, an object of the present invention is to provide a water-based aldehyde scavenger capable of maintaining an excellent aldehyde scavenging effect over a long period of time and a building material from which aldehydes are hardly released.

  To achieve the above object, the aldehyde scavenger of the present invention is characterized by comprising an aqueous composition containing polyamidoamine, bisulfite, urea and water.

As a result of various studies, the present inventors have found that polyamidoamine dissolves or disperses in an aqueous solution containing bisulfite and urea without causing gelation or clouding, thereby achieving the present invention. It came to.
Therefore, the aldehyde scavenger of the present invention comprising an aqueous composition containing polyamidoamine, bisulfite, urea, and water hardly causes gelation or white turbidity and has good storage stability. And since it is aqueous, when it applies to a building material, it can impregnate even the inside of a building material and can obtain the building material by which discharge | release of aldehydes was suppressed by the small application quantity. Furthermore, stickiness hardly occurs on the surface of the building material.

  The aldehyde scavenger of the present invention contains 2 to 5% by mass of the polyamidoamine, 0.5 to 5% by mass of the bisulfite, and 8 to 20% by mass of urea. It is preferable that it is a thing. According to this aspect, an aldehyde scavenger having a high aldehyde capturing effect and excellent storage stability can be obtained.

  The polyamidoamine of the aldehyde scavenger of the present invention preferably has a total amine value of 100 mgKOH / g or more and a solubility in water of less than 50 g / liter at 25 ° C. Since the polyamidoamine has many amino groups, imino groups, or amide groups, it has a high aldehyde capturing effect. Moreover, since the solubility in water is low and hydrophobic, it is possible to suppress the re-release of aldehydes once captured by hydrolysis. As a result, it is possible to maintain an excellent aldehyde capturing effect over a long period of time.

  The polyamidoamine of the aldehyde scavenger of the present invention is preferably a condensate of an alkylene polyamine having two or more amino groups in the molecule and an aliphatic dicarboxylic acid having 6 or more carbon atoms. According to this, since polyamidoamine is favorable in viscosity, it is easy to apply to building materials and the like.

  The bisulfite of the aldehyde scavenger of the present invention is preferably at least one metal salt selected from sodium, potassium, calcium and magnesium of bisulfite, pyrosulfite and dithionite. According to this aspect, the storage stability of the aldehyde scavenger is improved.

  The water-soluble composition of the aldehyde scavenger of the present invention preferably contains 0 to 2% by mass of sulfite in terms of solid content.

  In the aldehyde scavenger of the present invention, the sulfite is preferably at least one selected from sodium sulfite, potassium sulfite, calcium sulfite and magnesium sulfite.

  According to the said aspect, since the pH of an aldehyde scavenger can be adjusted to a neutral range, without impairing the capture | acquisition performance of aldehydes, storage stability improves.

On the other hand, the building material subjected to the aldehyde release suppression treatment of the present invention is a building material obtained by molding and curing a binder whose main component is an aldehyde condensable thermosetting resin. The agent is attached in an amount of 0.05 to 10 g / m ^{2 in} solid content with respect to the surface area of the building material. Further, the building material is preferably an inorganic fiber heat-absorbing sound absorbing material or plywood, and is an inorganic fiber heat-absorbing sound-absorbing material, in which a skin material is attached to at least one surface of the inorganic fiber heat-absorbing sound absorbing material. It is more preferable. According to this, since the release of aldehydes from the building material can be effectively suppressed and the effect can be exhibited over a long period of time, a comfortable living environment can be provided. And since it is cheaper than the conventional aldehyde scavenger, material cost can be suppressed low.

The aldehyde scavenger of the present invention comprises an aqueous composition containing polyamidoamine, bisulfite, urea and water, and has a high aldehyde scavenging effect even in a small amount of application, and can maintain the effect over a long period of time. . In addition, gelation and white turbidity hardly occur, and the storage stability is good. And since it is aqueous, when it applies to a building material, it can impregnate even the inside of a building material and can obtain the building material by which discharge | release of aldehydes was suppressed by the small application quantity. Furthermore, stickiness hardly occurs on the surface of the building material.
In addition, building materials such as plywood and inorganic fiber heat-absorbing sound-absorbing material provided with the aldehyde scavenger have little surface stickiness. Furthermore, the aldehyde emission rate has a standard that does not apply the restriction of use of the Building Standards Act, and it can be used without difficulty for heat insulation such as the walls of walls and ceilings, and floating floor heat insulation. A comfortable living environment can be provided.

<Aldehyde scavenger>
The aldehyde scavenger of the present invention is an aqueous composition containing polyamidoamine, bisulfite, urea and water.

(Polyamide amine)
The polyamidoamine in the aldehyde scavenger of the present invention is not particularly limited as long as it is a compound having an amino group and / or imino group and an amide group. Among these, a condensate (hereinafter simply referred to as “condensate”) of an alkylene polyamine having two or more amino groups in the molecule and an aliphatic dicarboxylic acid having 6 or more carbon atoms is preferable. Since this condensate is a low viscosity polyamidoamine, it has high fluidity and wettability when applied to building materials and the like, and can cover a large surface area even in a small amount.

The alkylene polyamine used for the condensate preferably has 2 or more amino groups in the molecule, and more preferably has 2 to 6 amino groups.
Examples of such alkylene polyamines include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, dipropylenetriamine, methylaminopropylamine, 1,2-propylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1, Examples include 2,3-triaminopropane and 1,2,4-triaminobutane. Among them, the alkylene polyamine represented by the chemical formula of NH ₂ — (CH ₂ —CH ₂ —NH) _n —CH ₂ —CH ₂ —NH ₂ increases the number of basic nitrogens per unit mass, It is more preferable because the trapping effect is increased.

The aliphatic dicarboxylic acid used in the condensate preferably has 6 or more carbon atoms, more preferably 6 to 60.
Examples of such aliphatic dicarboxylic acids include adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dimer acid synthesized from unsaturated fatty acid. Among them, dimer acid having high hydrophobicity is more preferable. Dimer acid is synthesized from unsaturated fatty acid having 18 carbon atoms as a main raw material, and therefore contains a small amount of trimer acid (carbon number 54) and monomer acid (carbon number 18). The dimer acid in the invention refers to those containing these.

  In addition to the aliphatic dicarboxylic acid, an aromatic carboxylic acid such as trimellitic acid or pyromellitic acid may be used in combination with the aliphatic dicarboxylic acid. The amount of aromatic carboxylic acid used is preferably 30 parts by mass or less with respect to 100 parts by mass of the aliphatic dicarboxylic acid.

  The polyamidoamine in the aldehyde scavenger of the present invention preferably has a total amine value of 100 mgKOH / g or more, more preferably 120 to 250 mgKOH / g, and particularly preferably 150 to 250 mgKOH / g.

  When the amine value of polyamidoamine is 100 mgKOH / g or more, the effect of capturing aldehydes is high, and the effect proposed by the present invention can be obtained. On the other hand, when the total amine value is less than 100 mgKOH / g, the effect of capturing aldehydes per unit weight is insufficient. For this reason, in order to acquire the desired aldehyde capture | acquisition effect, it is necessary to apply | coat a lot of aldehyde capture | acquisition agents to the target building material etc., and it is uneconomical. Furthermore, adverse effects such as contamination due to the aldehyde scavenger may occur. Here, the total amine value is the amount of potassium hydroxide equivalent to perchloric acid necessary to neutralize all basic nitrogen of amino group, imino group and amide group contained in the molecule per unit mass. It is defined by mass.

  The polyamidoamine in the aldehyde scavenger of the present invention preferably has a water solubility of less than 50 g / liter at 25 ° C., more preferably less than 20 g / liter, and less than 5 g / liter. Is particularly preferred. Polyamidoamine having a solubility in water of less than 50 g / liter at 25 ° C. hardly absorbs moisture in the air, so that it is difficult to re-release the trapped aldehydes and can continue to trap the aldehydes over a long period of time.

  The polyamidoamine is preferably contained in the aldehyde scavenger in an amount of 0.1 to 5% by mass, more preferably 2 to 5% by mass in terms of solid content. When the content of the polyamidoamine is less than 0.1% by mass, the effect of capturing aldehydes may not be sufficiently obtained. On the other hand, when the content exceeds 5% by mass, the viscosity increases and it becomes difficult to sufficiently penetrate into the building material, and the surface of the building material may become sticky.

(urea)
In the aldehyde scavenger of the present invention, urea is a component that improves the storage stability of the aldehyde scavenger.
And urea is preferably contained in the aldehyde scavenger in a mass of solid content of 5 to 40% by mass, and more preferably 8 to 20% by mass. If the urea content is less than 5% by mass, the long-term storage stability of the aldehyde scavenger is lowered and gelation tends to occur. Moreover, when it exceeds 40 mass%, urea may crystallize and precipitate.

(Bisulfite)
In the aldehyde scavenger of the present invention, bisulfite is a component that improves the dispersibility and solubility of polyamidoamine in water.

  Preferred examples of the bisulfite include hydrogen sulfite, pyrosulfite and dithionite sodium, potassium, calcium and magnesium. Of these, sodium hydrogen sulfite and potassium hydrogen sulfite are preferable.

  The bisulfite is contained in the aldehyde scavenger in a solid mass of 0.1 to 10% by mass, and more preferably 0.5 to 5% by mass. If the bisulfite content is less than 0.1% by mass, the polyamidoamine may separate and the aldehyde scavenger may become cloudy, making it difficult to apply to objects such as building materials. On the other hand, if it exceeds 10% by mass, the pH of the aldehyde scavenger tends to be in the acidic range, and the aldehyde scavenger coating apparatus and the like are likely to corrode.

(Sulfite)
The aldehyde scavenger of the present invention preferably further contains a sulfite. By containing the sulfite, the pH of the aldehyde scavenger obtained can be adjusted to a neutral range without reducing the aldehyde scavenging effect, so that the storage stability of the aldehyde scavenger is improved.

  Such sulfites include sodium sulfite, potassium sulfite, calcium sulfite and magnesium sulfite. These may be used alone or in combination of two or more.

  The sulfite is preferably contained in the aldehyde scavenger in an amount of 0 to 2% by mass, more preferably 0.1 to 2% by mass in terms of the solid content.

(Other ingredients)
The aldehyde scavenger of the present invention may contain an epoxy resin, an inorganic filler or the like as necessary.

For example, when it is desired to increase the viscosity after application of the aldehyde scavenger and suppress fluidity over time, it is preferable to add an epoxy resin that is a liquid at room temperature.
Originally, polyamidoamine is used as a curing agent for epoxy resin, and therefore, it easily reacts with epoxy resin even at room temperature. Therefore, when an epoxy resin is mixed with the aldehyde scavenger in advance, the crosslinking reaction of the epoxy resin proceeds, the viscosity of the scavenger increases, and it becomes difficult to apply the epoxy resin to the aldehyde scavenger of the present invention. When adding, it is preferable to add just before apply | coating to a building material etc. By doing so, it becomes possible to increase the viscosity after application and flow without impairing the application workability of the aldehyde scavenger.
The addition amount of the epoxy resin is such that if the amino group, imino group, amide group, etc. in the polyamidoamine are consumed too much by the epoxy group of the epoxy resin, the scavenging effect of the aldehydes is reduced. It is preferable to adjust about 10% so that it is consumed by the epoxy group of an epoxy resin.

In addition, when the aldehyde scavenger of the present invention is applied by a spray method and then does not want to flow, it is preferable to add an inorganic filler in advance.
By adding an inorganic filler, the viscosity of the aldehyde scavenger apparently increases, but when applying with a strong external force such as spraying, the viscosity decreases, so that the coating workability does not decrease.
Such inorganic filler is not particularly limited, but preferably swelled by water such as smectite such as montmorillonite, beidellite, nontrolite, hectorite, saponite, vermiculite, halosite, apatalite, sepiolite, etc. Furthermore, an organophilic montmorillonite treated with an alkyl ammonium salt is more preferable.
And the addition amount of the said inorganic filler does not have limitation in particular, It can adjust suitably according to the installation of the application | coating process.
In addition, the total content of the epoxy resin and the inorganic filler in the aldehyde scavenger can be arbitrarily adjusted according to the workability in the coating process.

<Method for producing formaldehyde scavenger>
The aldehyde scavenger of the present invention is obtained by mixing polyamidoamine, bisulfite, urea, and water, and further mixing sulfite or the like as necessary. At this time, the above components are mixed in water so that polyamidoamine is contained in a solid content of 2 to 5% by mass, bisulfite is contained in an amount of 0.5 to 5% by mass, and urea is contained in an amount of 8 to 20% by mass. Is preferred. By containing polyamidoamine, bisulfite, and urea in the above range, an aldehyde scavenger excellent in aldehyde capture effect and storage stability can be obtained. Moreover, since the sulfite is further added in an amount of 0 to 2% by mass in terms of solid content, the pH of the aldehyde scavenger can be made almost neutral without impairing the scavenging effect of aldehydes. , Storage stability is improved.

<Building materials>
Next, the building material provided with the aldehyde scavenger will be described.

  The building material subjected to the treatment for suppressing the release of aldehydes of the present invention is the above-mentioned aldehyde scavenger in a building material obtained by molding and curing a binder or adhesive whose main component is an aldehyde-condensable thermosetting resin. It is obtained by adhering.

  Examples of building materials include inorganic fiber heat-absorbing and sound-absorbing materials, plywood, particle board, MDF (medium-quality fiber board), wallpaper, paint, and floor finish. These building materials generally use aldehyde condensable thermosetting resins from the viewpoints of physical properties and economics of products. For example, an aldehyde condensable thermosetting resin is used as the binder component in the inorganic fiber heat insulating sound absorbing material. In the plywood, an aldehyde condensable thermosetting resin is used as an adhesive component.

  Examples of aldehyde condensable thermosetting resins used in such building materials include resol-type phenol resins, resol-type phenol-urea resins, and melamine-urea resins, all of which formaldehyde is generated during the curing process. To do.

  Therefore, aldehydes gradually diffuse with time in such building materials. For this reason, in order to suppress the release of aldehydes, the aldehyde scavenger is applied to building materials.

The adhesion amount of the aldehyde scavenger needs to be 0.05 to 10 g / m ^{2 in} solid content with respect to the surface area of the building material. For example, when the building material is a building material having a small bulk density such as an inorganic fiber heat-absorbing and sound-absorbing material, 1 to 6 g / m ² is preferably adhered. In addition, for example, in the case of wood-based building materials such as plywood, it is preferable to adhere 5 to 10 g / m ² .

When the adhesion amount of the aldehyde scavenger is less than 0.05 g / m ^{2 with} respect to the surface area of the building material, for example, a high-density product having a relatively high density and a large amount of binder adhesion, such as a glass wool product. However, it is difficult to reduce to a formaldehyde emission rate of about F ☆☆☆☆ grade, and although it is small, there is a possibility that it may adversely affect the living environment. Moreover, even if the adhesion amount exceeds 10 g / m ² with respect to the surface area of the building material, the application amount of the aldehyde scavenger is excessive, and the improvement in the effect is not recognized so much. Therefore, the adhesion amount of the aldehyde scavenger is set to 0.05 to 10 g / m ² in terms of the solid content with respect to the surface area with respect to the total amount of the target building material.

  Examples of the method for applying the aldehyde scavenger include coating methods such as a roll coater method, a curtain flow coater method, and a spin coater method. The air spray method is preferable for a substrate having a relatively large size such as a plywood. In addition to the spray method, it is also preferable to apply a relatively small substrate such as that used for furniture members by a spin coater method. Further, when there is sufficient drying equipment, an impregnation method can also be used.

As described above, the building material of the present invention has a small amount of released aldehydes despite being cured and molded by attaching a binder which is an aldehyde-condensable thermosetting resin, and the chamber method of JIS-A1901. In the test based on the above, the emission rate of formaldehyde can be 5 μg / m ² h or less.

Here, the classification according to the formaldehyde emission rate defined in the above JIS is classified into three stages from F ☆☆ to F ☆☆☆☆. Each case formaldehyde emission rate is less than 5μg / ^{m 2} h F ☆☆☆☆ ^{type, 5μg / m 2 h~20μg / m} 2 h or less when F ☆☆☆ type, 20μg ^/ m 2 h~120μg ^/ m ^{If it is 2} hours or less, it is classified as F ☆☆ type. Therefore, the building material of the present invention can sufficiently satisfy the F ☆☆☆☆ grade, which is a level that does not cause a problem with respect to the living environment, as stipulated in the Building Standard Law.

  In addition, since the aldehyde scavenger is water-based, when applied to building materials, it impregnates the interior of the building materials, and moisture rapidly evaporates by drying, so the surface of the building materials becomes sticky. Is unlikely to occur. For this reason, dust or the like does not adhere to the surface of the building material, and further, when the skin material such as a film adheres to the surface of the building material, the adhesion between the building material and the skin material Can be improved.

  In addition, as a building material to which a skin material is stuck, when an inorganic fiber heat-absorbing and sound-absorbing material is taken as an example, as shown in FIG. As shown in FIG. 2, the skin material 2a is attached to the front edge, the four side faces, and the side edges of the back face of the inorganic fiber heat-absorbing sound-absorbing material 1 with an adhesive or the like, as shown in FIG. As shown in FIG. 3, the surface side skin material 2 b is attached to the surface of the inorganic fiber heat insulating sound absorbing material 1 and both side surfaces along the longitudinal direction, and the back surface side skin material is attached to the back surface of the inorganic fiber heat insulating sound absorbing material 1. The form which stuck 2c is mentioned.

<Manufacturing method of building materials>
Next, the manufacturing method of the building material including the application | coating process of an aldehyde scavenger is demonstrated taking an inorganic fiber heat-insulating sound-absorbing material as an example.

  First, the molten inorganic raw material is made into a fiber by a fiberizing apparatus, and immediately after that, a binder is applied to the inorganic fiber. Subsequently, the inorganic fiber provided with the binder is deposited on the perforated conveyor to form a bulky inorganic fiber heat insulating material intermediate. And it feeds into a pair of upper and lower perforated conveyors etc. which provided the space | interval so that it might become a desired thickness, it heats, narrowing down, a binder is hardened, and an inorganic fiber heat insulation sound-absorbing material is formed. Next, a skin material or the like is coated as necessary, and the inorganic fiber heat insulating sound absorbing material is cut into a desired width and length to obtain a product.

It does not specifically limit as an inorganic fiber used for manufacture of an inorganic fiber heat insulation sound-absorbing material. Glass wool, rock wool, and the like that are used in ordinary heat insulating sound absorbing materials can be used. Various methods such as a flame method, a blow-off method, and a centrifugal method (also referred to as a rotary method) can be used as a method for forming inorganic fibers. In particular, when the inorganic fiber is glass wool, the centrifugal method is preferably used. In addition, the density of the target inorganic fiber heat-insulating material may be a density used in ordinary heat-insulating materials and sound-absorbing materials, and is preferably in the range of 5 to 300 kg / m ³ .

  In order to impart the binder to the inorganic fibers, it can be applied and sprayed using a spray device or the like. The amount of the binder applied varies depending on the density and use of the inorganic fiber heat-absorbing sound absorbing material to be the final product, but the solid content is in the range of 0.5 to 15% by mass based on the mass of the inorganic fiber heat-absorbing sound absorbing material to which the binder is applied. Is preferable, and the range of 0.5 to 9% by mass is more preferable.

  The timing of applying the binder to the inorganic fiber sound-absorbing heat insulating material may be any time after fiberization, but it is preferable to apply the binder immediately after fiberization for efficient application.

  The inorganic fiber to which the binder is applied is deposited on a perforated conveyor to form an intermediate for an inorganic fiber heat-absorbing and sound-absorbing material. When depositing the inorganic fiber on the perforated conveyor, it is preferable to suck the inorganic fiber from the opposite side of the perforated conveyor on which the inorganic fiber is deposited. After that, the inorganic fiber heat-insulating sound absorbing material intermediate body that continuously moves on the perforated conveyor is sent to a pair of upper and lower perforated conveyors and the like that are spaced so as to have a desired thickness, and at the same time, heated hot air Then, the binder is cured into a mat shape and cut into desired width and length.

  Although the hardening temperature of a binder is not specifically limited, 200-350 degreeC may be sufficient. Moreover, heating time is suitably performed in 30 second-10 minutes according to the density and thickness of an inorganic fiber heat-insulating sound-absorbing material.

  The application of the aldehyde scavenger of the present invention to the inorganic fiber heat-absorbing sound-absorbing material is preferably performed immediately after the curing process of the binder.

  The aldehyde scavenger is sprayed using atomized air. Although the hydraulic spray may be used, the former air spray method is preferable when finely adjusting the coating amount or relatively widening the spray range.

  The inorganic fiber heat insulating sound absorbing material provided with the aldehyde scavenger thus obtained may be used as it is. Moreover, you may stick and use a skin material with an adhesive etc. on at least one surface of an inorganic fiber heat-insulation sound-absorbing material. As the skin material, paper, synthetic resin film, metal foil film, non-woven fabric, woven fabric, or a combination thereof can be used.

  Hereinafter, the present invention will be described in more detail by way of examples.

[Test Example 1]
It mixed by the mixing | blending shown in Table 1, and obtained the aldehyde capture | acquisition agent of Examples 1-3 and Comparative Examples 1-4. Immediately after the production and after storage for 24 hours at a temperature of 40 ° C., the property of the liquid of the aldehyde scavenger was visually observed. The results are also shown in Tables 1 and 2. Polyamidoamine obtained by condensing pentaethylenehexamine and dimer acid (total amine value 200 mgKOH / g, solubility in water 5 g / liter) was used as the polyamidoamine.

  In the aldehyde scavenger of Comparative Example 1 containing no sodium hydrogen sulfite, the polyamidoamine was not uniformly dispersed, and the solution became cloudy. Moreover, the aldehyde scavenger of Comparative Example 3 containing no urea has gelled. In Comparative Example 4, the viscosity was higher than in the Example, and it became slightly cloudy.

  On the other hand, the aldehyde scavengers of Examples 1 to 7 consisting of an aqueous composition containing polyamidoamine, bisulfite, urea and water have good storage stability without causing gelation or clouding. there were. Among them, the aldehyde scavengers of Examples 1 to 5 containing 2 to 5% by mass of polyamidoamine, 0.5 to 5% by mass of bisulfite, and 8 to 20% by mass of urea are low in viscosity and handled. The property was good.

[Test Example 2]
(Example 8)
Glass wool was used as the inorganic fiber. A binder obtained by adding 0.2 parts by mass of aminosilane and 1 part by mass of ammonium sulfate as a curing catalyst to 100 parts by mass of a mixture of 70:30 resol type phenolic resin and urea resin was used. It was applied to glass wool so that the binder adhesion amount was 9.5% by mass based on the mass of the inorganic fiber heat-absorbing sound absorbing material to obtain an inorganic fiber heat-absorbing sound absorbing material having a thickness of 25 mm and a density of 96 kg / m ³ .
The aldehyde scavenger of Example 1 was applied to the surface area of the inorganic fiber heat-absorbing sound-absorbing material thus obtained by spraying so that the solid content was 4.8 g / m ² , and the building material of Example 8 was applied. Got.

(Examples 9 to 12)
In Example 8, the building materials of Examples 9 to 12 were obtained in the same manner as in Example 8, except that the aldehyde scavengers of Examples 2 to 5 were used instead of the aldehyde scavengers of Example 1. .

(Comparative Example 5)
In Example 8, the building material of Comparative Example 5 was obtained in the same manner as in Example 8 except that the aldehyde scavenger of Comparative Example 2 was used instead of the aldehyde scavenger of Example 1.

(Comparative Example 6)
In Example 8, the building material of Comparative Example 6 was obtained in the same manner as in Example 8 except that no aldehyde scavenger was used.

(Comparative Example 7)
In Example 8, the building material of Comparative Example 7 was obtained in the same manner as Example 8 except that the aldehyde scavenger of Comparative Example 1 was used instead of the aldehyde scavenger of Example 1.

(Comparative Example 8)
In Example 8, the building material of Comparative Example 8 was obtained in the same manner as in Example 8 except that the aldehyde scavenger of Comparative Example 3 was used instead of the aldehyde scavenger of Example 1.

(Comparative Example 9)
In Example 8, the building material of Comparative Example 9 was obtained in the same manner as in Example 8 except that the aldehyde scavenger of Comparative Example 4 was used instead of the aldehyde scavenger of Example 1.

Ten building materials of Examples 8 to 12 and Comparative Examples 5 to 9 cut so that the total surface area is 440 cm ² are sampled arbitrarily as test pieces, and are applied to the small chamber method according to JIS A 1901. The formaldehyde emission rate after 1 day, 3 days, and 7 days was measured, and the average value was obtained. The results are summarized in Tables 3 and 4. In addition, the numerical value in the parenthesis in a table | surface shows the test piece value of the highest value.

From the above results, it was confirmed that emission of formaldehyde can be suppressed by adding an aldehyde scavenger. And as for the building material of Examples 8-12 which provided the aldehyde scavenger of Examples 1-5, discharge | release of formaldehyde is fully suppressed and the diffusion rate after 7 days is 5.0 microgram / m < ² > h or less. there were.

  On the other hand, the building materials of Comparative Examples 5 and 6 had a large amount of formaldehyde released. Further, the building materials of Comparative Examples 7 and 8 could not be applied because the aldehyde scavenger was clogged in the nozzle during spray application. Further, the building material of Comparative Example 9 was able to apply the aldehyde scavenger, but because of its high viscosity, it could not be uniformly applied to the surface of the building material, and the amount of formaldehyde released for each test piece There were very many variations.

[Test Example 3]
(Example 13)
Glass wool was used as the inorganic fiber. A binder obtained by adding 0.2 parts by mass of aminosilane and 1 part by mass of ammonium sulfate as a curing catalyst to 100 parts by mass of a mixture of 70:30 resol type phenolic resin and urea resin was used. It was applied to glass wool so that the binder adhesion amount was 9.5% by mass based on the mass of the inorganic fiber heat-absorbing sound-absorbing material to obtain an inorganic fiber heat-absorbing sound-absorbing material having a thickness of 50 mm and a density of 32 kg / m ³ .
After applying the aldehyde scavenger of Example 1 to the surface area of the obtained inorganic fiber heat-absorbing sound-absorbing material by spraying so as to have a solid content of 4.8 g / m ² , the surface of the inorganic fiber heat-absorbing sound-absorbing material to, chloropropylene rubber adhesive to 30 g / ^{m 2} coated with solids, by sticking a glass cloth having a basis weight 100 g / ^{m 2,} to obtain a building material of example 13.

(Example 14)
In Example 13, the building material of Example 14 was obtained in the same manner as Example 13 except that the aldehyde scavenger of Example 2 was used instead of the aldehyde scavenger of Example 1.

(Comparative Example 10)
In Example 13, the building material of Comparative Example 10 was obtained in the same manner as Example 13 except that the aldehyde scavenger of Comparative Example 2 was used instead of the aldehyde scavenger of Example 1.

(Comparative Example 11)
In Example 13, the building material of Comparative Example 11 was obtained in the same manner as Example 13 except that no aldehyde scavenger was used.

(Comparative Example 12)
In Example 13, instead of the aldehyde scavenger of Example 1, polyamidoamine obtained by condensing pentaethylenehexamine and dimer acid (total amine value 200 mgKOH / g, solubility in water 5 g / liter) A building material of Comparative Example 12 was obtained in the same manner as in Example 13 except that an aldehyde scavenger obtained by mixing and stirring 15 parts by mass and 85 parts by mass of diethylene glycol was used.

Ten building materials of Examples 13 to 14 and Comparative Examples 10 to 12 were cut so that the total surface area was 440 cm ² as test pieces, and the samples were arbitrarily collected into a small chamber method according to JIS A 1901. The formaldehyde emission rate after 1 day, 3 days, and 7 days was measured, and the average value was obtained.
Moreover, as shown in FIG. 4, it is necessary to peel off the skin material from the surface of the obtained building material and pull the peeled portion A in the 180 degree direction (arrow B direction) to peel the skin material by 10 cm. The peeling load (peeling strength) was measured. The results are summarized in Table 5. In addition, the numerical value in the parenthesis in a table | surface shows the test piece value of the highest value.

  From the above results, it was confirmed that emission of formaldehyde can be suppressed by adding an aldehyde scavenger. Among these, the building materials of Examples 13 and 14 were sufficiently suppressed from releasing formaldehyde and further had good adhesion to the skin material.

  On the other hand, the building materials of Comparative Examples 10 and 11 had a large amount of formaldehyde released. Further, the building material of Comparative Example 12 was able to apply the aldehyde scavenger, but because of its high viscosity, it could not be uniformly applied to the surface of the building material, and the amount of formaldehyde released for each test piece The peeling strength was extremely large and the peeling strength was extremely inferior.

It is a perspective view which shows one Example of the building material to which the skin material of this invention was stuck. It is a perspective view which shows the other Example of the building material to which the skin material of this invention was stuck. It is a perspective view which shows the further another Example of the building material by which the skin material of this invention was stuck. It is explanatory drawing which shows the test method of the peeling strength test of the building material in which the skin material was stuck.

Explanation of symbols

1: Insulating fiber-absorbing sound-absorbing material 2a: Skin material 2b: Front-side skin material 2c: Back-side skin material

Claims (10)

  An aldehyde scavenger comprising an aqueous composition containing polyamidoamine, bisulfite, urea and water.   The said water-soluble composition is 2-5 mass% of said polyamidoamines, 0.5-5 mass% of said bisulfites, and 8-20 mass% of said urea by the mass of solid content. The aldehyde scavenger described.   The aldehyde scavenger according to claim 1, wherein the polyamidoamine has a total amine value of 100 mgKOH / g or more and a solubility in water of less than 50 g / liter at 25 ° C.   The aldehyde scavenger according to claim 1, wherein the polyamidoamine is a condensate of an alkylene polyamine having two or more amino groups in a molecule and an aliphatic dicarboxylic acid having 6 or more carbon atoms.   The aldehyde scavenger according to claim 1, wherein the bisulfite is at least one metal salt selected from sodium, potassium, calcium, and magnesium of hydrogen sulfite, pyrosulfite, and dithionite.   The aldehyde scavenger according to claim 1, wherein the water-soluble composition contains 0 to 2% by mass of sulfite in terms of mass of solids.   The aldehyde scavenger according to claim 6, wherein the sulfite is at least one selected from sodium sulfite, potassium sulfite, calcium sulfite and magnesium sulfite. In building materials obtained by molding and curing by attaching a binder whose main component is an aldehyde condensable thermosetting resin,
Release of aldehydes, characterized in that the aldehyde scavenger according to any one of claims 1 to 7 is adhered in a solid content of 0.05 to 10 g / m ² with respect to the surface area of the building material. Building materials that have been subjected to suppression treatment.   The building material according to claim 8, wherein the building material is an inorganic fiber heat-absorbing sound absorbing material or plywood.   The said building material is an inorganic fiber heat insulation sound-absorbing material, Comprising: The skin material was affixed on the at least one surface of this inorganic fiber heat insulation sound-absorbing material, The discharge | release suppression process of the aldehydes of Claim 9 was performed. Building material.