JP6834786B2 - Binder for inorganic fibers, aqueous binder solution for inorganic fibers, inorganic fiber mat and its manufacturing method - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention has extremely little emission of volatile organic compounds, has sufficient thickness, and is excellent with respect to a binder for inorganic fibers, particularly an inorganic fiber mat preferably used as a heat insulating material for construction, a sound absorbing material, and the like. The present invention relates to a binder for inorganic fibers that imparts restorability, and an inorganic fiber mat treated with the binder.

Conventionally, inorganic fiber mats made of inorganic fibers such as glass wool and rock wool have been widely used as heat insulating materials and sound absorbing materials for industrial and residential use. Inorganic fiber mats are generally manufactured by fixing inorganic fibers to each other with a binder containing a water-soluble phenol resin as a main component and molding them into a mat shape (for example, JP-A-58-07760: Patent Document 1). ..

However, since formaldehyde is generally used as a cross-linking agent in the water-soluble phenol resin used as the main component of the binder, unreacted formaldehyde remains in the inorganic fiber mat when the binder is heat-cured. There is a problem of doing it. Further, even after curing, there is a problem that formaldehyde is generated due to the progress of hydrolysis and condensation reaction of the binder. In this case, the formaldehyde is released from the surface and side surfaces of the manufactured inorganic fiber mat.

Regarding volatile organic compounds that easily volatilize in the air at normal temperature and pressure, such as formaldehyde, in recent years, indoor air pollution by volatile organic compounds has become apparent, and sick house syndrome is considered to be one of the causes. Health hazards such as syndrome have become a problem. Therefore, the amount of formaldehyde emitted from building materials is regulated by law. Therefore, in order to extremely reduce the amount of formaldehyde and other volatile organic compounds released from building materials, it is considered effective to reduce their content extremely.

Since the volatile organic compound released from the inorganic fiber mat is mainly formaldehyde contained in the binder, in order to solve the above problems, it is necessary to make the composition used for the binder a formaldehyde-free composition. is there. However, the conventional inorganic fiber mat using a binder containing a phenol resin as a main component has a low raw material cost and is extremely excellent in the restoration rate and surface strength of the mat. Therefore, it is necessary to have these performances even if a binder containing a formaldehyde-free composition as a main component is used, but it has been difficult to provide the same performances.

In order to deal with the above problems, in Japanese Patent Application Laid-Open No. 2005-299013 (Patent Document 2), a binder containing an acrylic resin emulsion as a main component, and in Japanese Patent Application Laid-Open No. 2006-089906 (Patent Document 3), carboxyl. A binder made of a vinyl copolymer having a functional group such as a group has been proposed. However, the restoration rate, surface strength, etc. of the inorganic fiber mats obtained by using these binders were inferior to those of the inorganic fiber mats obtained by using the binder containing a water-soluble phenol resin. Further, the applicant of the present application also discloses Japanese Patent Application Laid-Open No. 2011-153395 (Patent Document 4), which discloses a binder containing a water-soluble polymer compound having a hydroxyl group and a boron compound. However, although the inorganic fiber mat obtained by using the binder was able to solve the problem of volatile organic compounds, the restoration rate and the surface strengthening degree were slightly inferior to those of the water-soluble phenol resin.

In International Publication No. 2005/092814 (Patent Document 5), an unsaturated copolymer of maleic anhydride and an unsaturated monomer (specifically, an unsaturated copolymer of maleic anhydride and butadiene) is a special feature. In Kai 2012-136385 (Patent Document 6), the copolymer compound of maleic anhydride and acrylic acid ester is found in JP-A-2016-108707 (Patent Document 7) and JP-A-2016-108708 (Patent Document 8). In this article, a maleic acid copolymer (which seems to be a methyl vinyl ether / maleic anhydride copolymer monoalkyl ester) is used, and in JP-A-60-046951 (Patent Document 9), a copolymer of isobutylene and maleic anhydride is used. Each has been proposed. Inorganic fiber mats made of inorganic fibers are produced by spraying a low-concentration water-soluble binder on molten glass, but all of the above-mentioned compounds and the like have poor solubility in water, and a suitable water-soluble binder is not always suitable. It was not obtained.

Japanese Unexamined Patent Publication No. 58-070760 Japanese Unexamined Patent Publication No. 2005-299013 Japanese Unexamined Patent Publication No. 2006-089906 Japanese Unexamined Patent Publication No. 2011-153395 International Publication No. 2005/092814 Japanese Unexamined Patent Publication No. 2012-136385 Japanese Unexamined Patent Publication No. 2016-108707 Japanese Unexamined Patent Publication No. 2016-108708 Japanese Unexamined Patent Publication No. 60-046951

The present invention has been made in view of the above circumstances, and is a binder for inorganic fibers capable of producing an inorganic fiber mat having extremely low release of volatile organic compounds and excellent thickness and resilience, and a binder for inorganic fibers. It is an object of the present invention to provide an inorganic fiber mat treated with the binder.

As a result of diligent studies to achieve the above object, the present inventors have converted a binder containing a water-soluble polymer compound and an ammonia-modified copolymer containing maleic anhydride into a phenol resin. We have found that it is possible to give an inorganic fiber mat a close restoration rate and realize an extremely small amount of volatile organic compounds released, and have completed the present invention.

（上記式中のｎの含有量は、ｎ＋ｍの合計１００質量％に対して０．１〜３質量％である。）
５．上記１〜４のいずれか１項記載の無機繊維用バインダーで処理した無機繊維からなる無機繊維マット。
６．上記１〜４のいずれか１項記載の無機繊維用バインダーを水に溶解してなる無機繊維用バインダー水溶液であって、該無機繊維用バインダー水溶液の粘度が２５℃において１〜１００ｍＰａ・ｓであることを特徴とする無機繊維用バインダー水溶液。
７．（Ａ）重合度が２００〜５００であり、且つ、ポリビニルアルコール、カルボキシメチルセルロース及び澱粉の群から選ばれる水溶性高分子化合物：１００質量部、及び
（Ｂ）無水マレイン酸を含有する共重合物のアンモニア変性物：３質量部以上
を含有する無機繊維用バインダーを無機繊維に対してスプレーにより噴霧して製造する工程を含むと共に、上記無機繊維はグラスウール又はロックウールであることを特徴とする無機繊維マットの製造方法。 Therefore, the present invention provides the following binder for inorganic fibers, an aqueous binder solution for inorganic fibers, an inorganic fiber mat, and a method for producing the same.
1. 1. (A) A copolymer having a degree of polymerization of 200 to 500 and containing 100 parts by mass of a water-soluble polymer compound selected from the group of polyvinyl alcohol, carboxymethyl cellulose and starch , and (B) maleic anhydride. Ammonia-modified product: A binder for inorganic fibers containing 3 parts by mass or more, wherein the inorganic fibers are glass wool or rock wool.
2. 2. (A) The binder for inorganic fibers according to 1 above, wherein the water-soluble polymer compound is polyvinyl alcohol.
3. 3. (B) The binder for inorganic fibers according to 1 or 2 above, wherein the ammonia-modified product of the copolymer containing maleic anhydride is an ammonia-modified product of the isobutylene / maleic anhydride copolymer.
4. The binder for inorganic fibers according to the above 3 , wherein the ammonia-modified product of the isobutylene / maleic anhydride copolymer is represented by the following formula.

(The content of n in the above formula is 0.1 to 3% by mass with respect to a total of 100% by mass of n + m.)
5. An inorganic fiber mat made of inorganic fibers treated with the binder for inorganic fibers according to any one of 1 to 4 above.
6. An aqueous binder solution for inorganic fibers obtained by dissolving the binder for inorganic fibers according to any one of 1 to 4 above in water, and the viscosity of the aqueous binder solution for inorganic fibers is 1 to 100 mPa · s at 25 ° C. A binder aqueous solution for inorganic fibers.
7. (A) A copolymer having a degree of polymerization of 200 to 500 and containing 100 parts by mass of a water-soluble polymer compound selected from the group of polyvinyl alcohol, carboxymethyl cellulose and starch , and (B) maleic anhydride. Ammonia-modified product: An inorganic fiber comprising a step of spraying a binder for inorganic fibers containing 3 parts by mass or more onto the inorganic fiber to produce the inorganic fiber, and the inorganic fiber is glass wool or rock wool. How to make a mat.

By using the binder for inorganic fibers of the present invention, an inorganic fiber mat having a restoration rate close to that of a phenol resin can be produced, and the amount of volatile organic compounds released from the inorganic fiber mat is extremely small.

It is a schematic diagram which shows one Embodiment of the process of manufacturing an inorganic fiber mat using the binder for inorganic fibers of this invention. It is a perspective view which shows one Embodiment of the step of applying the binder for inorganic fiber of this invention to an inorganic fiber.

Hereinafter, the present invention will be specifically described.
The binder for inorganic fibers of the present invention
(A) Water-soluble polymer compound: 100 parts by mass, and (B) Ammonia-modified product of a copolymer containing maleic anhydride: 3 parts by mass or more.

The water-soluble polymer compound of the component (A) is the main agent of the binder for inorganic fibers of the present invention. The water-soluble polymer compound contained in the component (A) is not particularly limited, but is preferably polyvinyl alcohol, carboxymethyl cellulose, starch and the like. Of these, polyvinyl alcohol is particularly preferable.

As the water-soluble polymer compound of the component (A), those having a degree of polymerization of 1,000 or less are preferable, those having a degree of polymerization of 500 or less are more preferable, and those having a degree of polymerization of 200 to 500 are most preferable. If it exceeds 1,000, coating defects due to spraying may occur, the required amount of adhesion may not be obtained, and problems such as insufficient resilience of the inorganic fiber mat may occur. The degree of polymerization is a polystyrene-equivalent value obtained by water-based gel permeation chromatography (GPC) analysis as the weight average degree of polymerization. The degree of saponification of the water-soluble polymer compound is preferably 80 mol% or more, more preferably 88 mol% or more, and the upper limit value is preferably less than 99 mol%, based on the test method of JIS K 6726. If the degree of saponification is 99 mol% or more, the viscosity increases significantly at low temperatures, and gelation may occur.

As the water-soluble polymer compound of the component (A), a commercially available product can be used, and examples thereof include "Poval (PVA)" manufactured by Japan Vam & Poval Co., Ltd.

The ammonia-modified copolymer containing maleic anhydride as a component (B) functions as a cross-linking agent in the present invention. The ammonia-modified product of the copolymer containing maleic anhydride as the component (B) is not particularly limited, and the ammonia of the copolymer of maleic anhydride with isobutylene, isopropylene, ethylene, ethylene / propylene, butadiene, etc. Denatured products can be mentioned. In particular, an ammonia-modified product of an isobutylene / maleic anhydride copolymer represented by the following structural formula is preferable.

The weight average molecular weight of the ammonia-modified copolymer containing maleic anhydride as the component (B) is preferably 5,000 to 30,000, more preferably 10,000 to 20,000, and 15,000 to 20. 000 is the most preferable. This weight average molecular weight is a polystyrene-equivalent value obtained by aqueous gel permeation chromatography (GPC) analysis. Further, n and m in the above formula represent mass ratios, and n is preferably 0.1 to 3% by mass, more preferably 0.3 to 2% by mass, and 0, based on 100% by mass of the total of n + m. .5 to 1% by mass is most preferable.

The content of the ammonia-modified product of the copolymer containing maleic anhydride as the component (B) is 3 parts by mass or more, preferably 3 to 3 parts by mass, based on 100 parts by mass of the water-soluble polymer compound of the component (A). It is 20 parts by mass, more preferably 3 to 5 parts by mass. If the content of the ammonia-modified product of the copolymer containing maleic anhydride is less than 3 parts by mass, problems such as insufficient crosslinkability may occur, and if it exceeds 20 parts by mass, the component (A) There is no problem with the miscibility with the water-soluble polymer compound, but the treated aqueous solution is colored yellow, which deteriorates the product quality and further increases the cost.

As the maleic anhydride-containing copolymer of the component (B), a commercially available product can be used, and examples thereof include "Isoban" manufactured by Kuraray.

Further, the binder for inorganic fibers of the present invention includes (A) a water-soluble polymer compound and (B) an ammonia-modified copolymer containing maleic anhydride, a water retention material such as urea, and a silane coupling agent. , Water repellent, pH adjuster, colorant and other additives may be added as needed. The amount of these additives added can be arbitrary as long as the effects of the present invention are not impaired.

The binder for inorganic fibers of the present invention is preferably dissolved in water and used as an aqueous binder solution for inorganic fibers. The viscosity of the aqueous binder solution for inorganic fibers is preferably 1 to 100 mPa · s at 25 ° C., and particularly preferably 1 to 50 mPa · s. This viscosity value is a value measured by a rotational viscometer. If the viscosity exceeds 100 mPa · s, spraying (discharge) failure occurs and the amount of binder adhered after processing decreases, so that the effect of the present invention may not be exhibited. The concentration thereof is preferably 10% by mass or less, more preferably 5% by mass or less, and most preferably 3% by mass or less.

The pH of the aqueous binder solution for inorganic fibers is preferably 4 to 8, and more preferably 4 to 6. If the pH deviates from the above range, the crosslinkability may change, which may affect the stability.

The binder for inorganic fibers of the present invention can be used for various inorganic fibers, and particularly exerts an excellent effect on glass wool and rock wool.

The inorganic fiber mat of the present invention is formed by treating an inorganic fiber with the above-mentioned binder for inorganic fibers. The inorganic fiber used in the inorganic fiber mat is not particularly limited, but glass wool or rock wool is preferable.

As a method for fiberizing the inorganic fiber, a conventionally known method such as a centrifugation method or a blow-off method can be adopted. Further, the density of the inorganic fiber mat may be the density used for ordinary heat insulating materials and sound absorbing materials, and is preferably 40 kg / m ³ or less, more preferably 32 kg / m ³ or less.

The amount of the binder for inorganic fibers used is preferably 1 to 10% by mass, more preferably 1 to 5% by mass, in terms of the solid content ratio with respect to the inorganic fibers. If it is less than 1% by mass, problems such as molding of an inorganic fiber mat having poor resilience may occur, and if it exceeds 10% by mass, problems such as molding of a hard and crushed inorganic fiber mat may occur. In some cases.

An example of a method for producing an inorganic fiber mat using the binder for inorganic fibers of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic view showing an embodiment of a step of manufacturing an inorganic fiber mat using the binder for inorganic fibers of the present invention, and FIG. 2 is a diagram showing the binder for inorganic fibers of the present invention applied to the inorganic fibers. It is a perspective view which shows one Embodiment of a process.

First, a fibrosis step of spinning inorganic fibers such as glass wool is performed by the fibrosis apparatus 1. Here, the method of fibrosis by the fibrosis device 1 is not particularly limited, and examples thereof include a conventionally known centrifugation method and a blow-off method. Further, a plurality of fibrous devices 1 can be provided according to the density, thickness, and length in the width direction of the inorganic fiber mat 7 to be manufactured.

Next, as shown in FIG. 2, the binder of the present invention is applied to the inorganic fibers 3 spun from the fiberizing device 1 by the binder applying device 2. As a method for applying the binder, a conventionally known method can be adopted, and for example, the binder can be applied by a spray method or the like using the above-mentioned aqueous binder solution. A binder is attached to a portion other than the intersection of the fibers, mainly from the intersection of the fibers directly or diagonally from the upper layer of the fiber.

The conveyor 41 is a device for laminating inorganic fibers 3 to which an uncured binder is attached on a perforated conveyor, and the conveyor 41 is a perforated conveyor having a suction device in order to uniformly laminate the fibers. Is preferable.

Here, the amount of the binder attached in the present invention is an amount measured by a method called ignition loss method or LOI (Loss of Ignition), and a dried sample of the inorganic fiber mat after the binder is attached at about 550 ° C. It means the mass of a substance that is lost by igniting and losing weight.

By the above step, the inorganic fiber 3 to which the binder is applied is deposited on the conveyor 41 arranged below the fiberizing device 1 and continuously moves to the conveyor 42 provided along the line direction. Then, the deposited inorganic fibers 3 are compressed to a predetermined thickness by the conveyors 42 and the conveyors 5 arranged at predetermined intervals on the conveyors 42, and the forming furnaces are arranged at the positions of the conveyors 42 and the conveyors 5. Enter 6.

In the molding furnace 6, the binder of the present invention applied to the inorganic fiber 3 is heat-cured to form an inorganic fiber mat 7 having a predetermined thickness. The machining conditions vary greatly depending on the length of the line and the like, and may be set as appropriate. For example, in the case of this example, the heating temperature is preferably 150 to 300 ° C, more preferably 180 to 250 ° C. If the heating temperature is lower than 150 ° C., the water content of the inorganic fiber mat 7 may not completely evaporate, and if it is higher than 300 ° C., the binder treated on the inorganic fiber mat 7 may be carbonized. The heating time is preferably 120 to 360 seconds, more preferably 180 to 300 seconds. If the heating temperature is shorter than 120 seconds, the water content of the inorganic fiber mat 7 may not completely evaporate, and if it is longer than 360 seconds, the binder treated on the inorganic fiber mat 7 may be carbonized. Then, the formed inorganic fiber mat 7 is cut to a predetermined product size by a cutting machine 8 installed on a portion of the conveyor 43, and then carried by the conveyor 44, packaged, and packed.

The inorganic fiber mat of the present invention produced in this manner has excellent recovery rate, surface strength, etc. as compared with the inorganic fiber mats treated with binders proposed so far, such as phenol resin, while having excellent recovery rate and surface strength. The amount of volatile organic compounds released from the inorganic fiber mat is extremely small.

According to JIS, the formaldehyde emission rate is divided into several stages. For example, JIS-A9504 is divided into three stages, F ☆☆ to F ☆☆☆☆, and when the formaldehyde emission rate is 5 μg / m ² · h or less, the F ☆☆☆☆ type, 5 μg / m ² The case of more than h and 20 μg / m ² · h or less is the F ☆☆☆ type, and the case ^{of more than 20 μg / m 2} · h and 120 μg / m ² · h or less is the F ☆☆ type. The F ☆☆☆☆ type is the most excellent, and when the binder for inorganic fibers of the present invention is used, an F ☆☆☆☆ type inorganic fiber mat is manufactured in a test based on the chamber method of JIS-A1901. Can be done.

The restoration rate of the inorganic fiber mat in the present invention is the ratio of the thickness of the inorganic fiber mat after compression by applying an external force and then by removing the external force to the thickness of the inorganic fiber mat before compression. It is represented by. Inorganic fiber mats may be packed by compressing a certain number or more of inorganic fiber mats together in order to improve the efficiency of storage and transportation. Therefore, when the thickness of the inorganic fiber mat obtained by unpacking cannot be secured before compression, that is, when the restoration rate of the inorganic fiber mat is poor, sufficient performance such as heat insulation and sound absorption cannot be obtained. In some cases.

Hereinafter, the present invention will be specifically described with reference to Production Examples, Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following example, parts and% indicate parts by mass and% by mass, respectively.

[Examples 1 to 4]
100 parts of polyvinyl alcohol shown in Table 1 and 5 parts of an ammonia-modified product of an isobutylene / maleic anhydride copolymer were dissolved in ion-exchanged water to prepare an aqueous binder solution for inorganic fibers having a concentration of 2% by mass. Glass wool was used as the inorganic fiber, and the glass wool was treated by spray coating using the prepared binder aqueous solution for inorganic fiber, and heated and dried at 200 ° C. for 180 seconds under the treatment conditions in the examples to prepare an inorganic fiber mat. The amount of the binder for inorganic fibers treated on the inorganic fiber mat was set so that the amount of adhesion to the inorganic fibers was 4% in terms of the solid content ratio of the binder for inorganic fibers, based on the treated inorganic fiber mat.

[Examples 5 to 8]
For inorganic fibers by the same production method as in Example 1 except that the amounts of the ammonia-modified product of the isobutylene / maleic anhydride copolymer were set to 3, 7, 10 and 20 parts, respectively, in Example 1. An aqueous binder solution was prepared to prepare an inorganic fiber mat.

[Comparative Example 1]
An aqueous binder solution for inorganic fibers was prepared by the same method as in Example 1 except that the phenol resin "Shonol BRL-1015" (water-soluble phenol: manufactured by Showa High Polymer Co., Ltd.) was used instead of polyvinyl alcohol. , An inorganic fiber mat was prepared.

[Comparative Examples 2 and 3]
In Example 1, an aqueous binder solution for inorganic fibers was prepared by the same method as in Example 1 except that the amount of the ammonia-modified product of the copolymer containing maleic anhydride was set to 0 parts and 1 part, respectively. A fiber mat was prepared.

[Comparative Examples 4 to 7]
Instead of the ammonia-modified copolymer containing maleic anhydride, Hosago (manufactured by Matsuba Yakuhin Co., Ltd.), Carbodilite V-02 (Carbodiimide-based cross-linking agent: manufactured by Nisshinbo Co., Ltd.), Maycanate TP-120 The same as in Example 1 except that (isocyanate-based cross-linking agent: manufactured by Meisei Chemical Industry Co., Ltd.) and Gantrentz AN-119 (maleic anhydride / methyl vinyl ether copolymer: manufactured by Gokyo Sangyo Co., Ltd.) were used. An aqueous binder solution for inorganic fibers was prepared by the method to prepare an inorganic fiber mat.

[Evaluation methods]
The restoration rate and formaldehyde emission rate of the inorganic fiber mats of Examples 1 to 8 and Comparative Examples 1 to 7 were measured. The formaldehyde emission rate was measured based on JIS-A1901.

Restoration rate of inorganic fiber mat When manufacturing the package of the inorganic fiber mat, a sample of 10 cm × 10 cm was taken out, a weight of 20 kg was applied for 1 hour, and the thickness (dx) of the weighted inorganic fiber mat was measured. ) To determine the restoration rate (n = 5). The results are also shown in Table 1.
R = (dx / d) x 100 (1)
R: Restoration rate (%)
dx: Thickness of inorganic fiber mat after restoration (mm)
d: Nominal thickness (mm) of the inorganic fiber mat before the test

Formaldehyde emission rate Further , the package of the inorganic fiber mat was appropriately cut to ^{adjust the surface area to 440 cm 2} , and this was used as a test body for measuring the formaldehyde emission rate. Regarding the measurement conditions of the formaldehyde emission rate, the measurement days were 7 days, the temperature in the chamber was 28 ° C., the relative humidity was 50%, the chamber volume was 20 L, and the ventilation rate was 0.5 times per hour. For sampling, a DNPH (2,4-dinitrophenylhydrazine) silica short body (manufactured by Waters) was used, the collection volume was 10 L, and the collection flow rate was 167 mL / min. The results are also shown in Table 1.

Details of polyvinyl alcohol in the above table are as follows.
-JF-05 (Completely saponified Poval: Saponification degree 98-99%, Polymerization degree 500)
-JL-05E (partially saponified Poval: saponification degree 78-81%, polymerization degree 500)
-JP-05 (partially saponified Poval: saponification degree 87-89%, polymerization degree 500)
-JP-10 (partially saponified Poval: saponification degree 87-89%, polymerization degree 1000)
All of the above are made by Japan Vam & Poval

The ammonia-modified product of the isobutylene / maleic anhydride copolymer in the above table is manufactured by "ISOBAM-104" Kuraray Co., Ltd., the chemical structural formula is as follows, and the weight average molecular weight is 16,000 to 17, 000, n = 0.7 to 0.8% by mass, m = 99.2-99.3% by mass.

The maleic anhydride-based copolymer in the above table is "Gantrentz AN-119" (maleic anhydride / methyl vinyl ether copolymer: manufactured by Gokyo Sangyo Co., Ltd.).

1 Fibrizing device 2 Binder applying device 3 Inorganic fiber 41, 42, 43, 44, 5 Conveyor 6 Molding furnace 7 Inorganic fiber mat 8 Cutting machine

Claims (7)

(A) A copolymer having a degree of polymerization of 200 to 500 and containing 100 parts by mass of a water-soluble polymer compound selected from the group of polyvinyl alcohol, carboxymethyl cellulose and starch , and (B) maleic anhydride. Ammonia-modified product: A binder for inorganic fibers containing 3 parts by mass or more, wherein the inorganic fibers are glass wool or rock wool. (A) according to claim 1, wherein the inorganic fiber binder for water-soluble polymer is polyvinyl alcohol. (B) The binder for inorganic fibers according to claim 1 or 2 , wherein the ammonia-modified product of the copolymer containing maleic anhydride is an ammonia-modified product of the isobutylene / maleic anhydride copolymer. The binder for inorganic fibers according to claim 3 , wherein the ammonia-modified product of the isobutylene / maleic anhydride copolymer is represented by the following formula.

(The content of n in the above formula is 0.1 to 3% by mass with respect to a total of 100% by mass of n + m.) An inorganic fiber mat made of inorganic fibers treated with the binder for inorganic fibers according to any one of claims 1 to 4. An aqueous binder solution for inorganic fibers obtained by dissolving the binder for inorganic fibers according to any one of claims 1 to 4 in water, wherein the aqueous binder solution for inorganic fibers has a viscosity of 1 to 100 mPa · s at 25 ° C. An aqueous binder solution for inorganic fibers, which is characterized by being present. (A) A copolymer having a degree of polymerization of 200 to 500 and containing 100 parts by mass of a water-soluble polymer compound selected from the group of polyvinyl alcohol, carboxymethyl cellulose and starch , and (B) maleic anhydride. Ammonia-modified product: An inorganic fiber comprising a step of spraying a binder for inorganic fibers containing 3 parts by mass or more onto the inorganic fiber to produce the inorganic fiber, and the inorganic fiber is glass wool or rock wool. How to make a mat.

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