JPWO2019008823A1 - Mineral wool binder composition, mineral wool and method for producing mineral wool - Google Patents

Abstract

Disclosed is a binder composition for mineral wool, which contains a polyvinyl alcohol resin, a hydrazine derivative, and an aqueous solvent, and may contain a crosslinking agent. The content of the hydrazine derivative is 0.1 to 15.0 parts by mass based on 100 parts by mass of the total mass of the polyvinyl alcohol resin and the crosslinking agent or 100 parts by mass of the polyvinyl alcohol resin.

Description

  The present invention relates to a binder composition for mineral wool, mineral wool and a method for producing mineral wool.

  Mineral wool such as glass wool or rock wool is usually provided inside an interior member or exterior member of a building or the like. In mineral wool, a binder (binder for mineral wool) is used to bond the fibers. For example, in Patent Document 1, an inorganic material obtained by mixing a water-soluble polymer containing a polyvinyl alcohol-based resin as a main component, a cross-linking agent, an adhesion-suppressing agent, a silane coupling agent, and a release agent. A water-soluble binder for inorganic fibers, which is characterized in that a cured product thereof has excellent elasticity and water resistance, is disclosed.

JP, 2016-108707, A

  By the way, it is desirable that the generation of odor is suppressed in the mineral wool used as the heat insulating and sound absorbing material for inorganic fibers. For example, conventionally, an odor may be generated during the heat treatment in the process of producing mineral wool. From the viewpoint of transportability, mineral wool is also required to have good resilience from a compressed state.

  Therefore, a main object of the present invention is to provide a binder composition for mineral wool which can suppress the generation of odor and can sufficiently secure the restoring property of mineral wool.

  One aspect of the present invention relates to a binder composition for mineral wool, which contains a polyvinyl alcohol resin, a hydrazine derivative, and an aqueous solvent. The binder composition for mineral wool may contain a crosslinking agent, and at least a part of the polyvinyl alcohol resin may be crosslinked with or without the crosslinking agent. In the binder composition for mineral wool, when the content of the hydrazine derivative is 100 parts by mass of the polyvinyl alcohol resin and the cross-linking agent when the binder composition contains the cross-linking agent, the binder composition is the cross-linking agent. When it does not contain, it may be 0.1 to 15.0 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin.

  When the binder composition contains a crosslinking agent, the content of the hydrazine derivative is 100 parts by mass of the polyvinyl alcohol resin and the crosslinking agent, and when the binder composition does not contain a crosslinking agent, the polyvinyl alcohol resin. It may be 0.8 to 5.0 parts by mass with respect to 100 parts by mass.

  The binder composition for mineral wool may have a pH of 7.0 to 10.0.

  Another aspect of the present invention relates to mineral wool comprising inorganic fibers and the above-described mineral wool binder composition attached to the inorganic fibers.

  Another aspect of the present invention relates to mineral wool containing inorganic fibers and a binder attached to the inorganic fibers, and the binder containing a crosslinked polyvinyl alcohol resin and a hydrazine derivative.

  In the above mineral wool, the amount of the binder attached may be 0.5 to 15.0 parts by mass with respect to 100 parts by mass of the mineral wool.

  Another aspect of the present invention is a step of adhering the mineral wool binder composition to inorganic fibers, and forming a wool-like intermediate fiber base material containing the inorganic fibers and the mineral wool binder composition adhered thereto. The present invention relates to a method for producing mineral wool, which comprises a step and a step of heat-treating an intermediate fiber base material. The intermediate fiber base material may be heat-treated under the condition of an average heating temperature of 200 ° C. or higher.

  According to one aspect of the present invention, there is provided a binder composition for mineral wool capable of suppressing the generation of odor and sufficiently ensuring the restoring property of mineral wool. Further, according to one aspect of the present invention, it is possible to provide a mineral wool in which generation of an odor is suppressed and which is sufficiently restored, and a method for producing the mineral wool.

  Hereinafter, some embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

  The binder composition for mineral wool according to the present embodiment (hereinafter, also simply referred to as “binder composition”) contains a polyvinyl alcohol resin, a hydrazine derivative, and an aqueous solvent.

  In the binder composition for mineral wool according to the present embodiment, at least a part of the polyvinyl alcohol resin may be crosslinked. That is, the binder composition may contain a crosslinked polyvinyl alcohol resin, which is a crosslinked body of the polyvinyl alcohol resin. The cross-linked polyvinyl alcohol resin is a polyvinyl alcohol resin that is chemically cross-linked by a cross-linking agent, but is a polyvinyl alcohol resin that is physically cross-linked by the crystal structure or the like in the resin without depending on the cross-linking agent. Good. When the binder composition does not contain a crosslinking agent, a component for promoting physical crosslinking of the polyvinyl alcohol resin, such as a crystallization accelerator described later, is usually added to the binder composition. That is, the binder composition for mineral wool according to the present embodiment contains a crosslinked polyvinyl alcohol resin, a hydrazine derivative, and an aqueous solvent, and the content of the hydrazine derivative is 100 parts by mass of the crosslinked polyvinyl alcohol resin. On the other hand, it may be 0.1 to 15.0 parts by mass. Here, the crosslinked polyvinyl alcohol resin means a polyvinyl alcohol resin which is at least partially chemically or physically crosslinked, and the binder composition for mineral wool according to the present embodiment is adhered and subjected to heat treatment. At least a part of the wool may be a chemically cross-linked polyvinyl alcohol resin because it is easy to handle the mineral wool.

  The degree of polymerization of the polyvinyl alcohol resin may be, for example, in the range of 300 to 3000, may be in the range of 350 to 1000, or may be in the range of 400 to 800. The degree of polymerization of the polyvinyl alcohol resin is, for example, the value of the average degree of polymerization obtained by the method specified in JIS K 6726: 1994. The saponification degree of the polyvinyl alcohol resin may be, for example, in the range of 60 to 100 (mol%), or in the range of 75 to 99 (mol%). The saponification degree of the polyvinyl alcohol resin can be determined by, for example, the method specified in JIS K 6726: 1994. Examples of commercially available polyvinyl alcohol resins include "JL-05E" (polymerization degree: 500, saponification degree: 80 to 84 (mol%)) manufactured by Nippon Vinegar Poval Co., Ltd.

  When the cross-linked polyvinyl alcohol resin is a polyvinyl alcohol resin chemically cross-linked with a cross-linking agent, the cross-linking agent forms a covalent bond or a non-covalent bond with a hydroxyl group of the polyvinyl alcohol resin, thereby forming a molecular chain of the polyvinyl alcohol resin. Is composed of one or more compounds that crosslink. The crosslinking agent may contain a compound having two or more functional groups capable of reacting with a hydroxyl group to form a covalent bond. An example of a functional group capable of reacting with a hydroxyl group to form a covalent bond is a carboxyl group.

  The cross-linking agent can include, for example, an aliphatic carboxylic acid, a homopolymer or copolymer containing an aliphatic carboxylic acid as a monomer unit, a boron compound, or a combination thereof. Examples of the polymer or copolymer containing an aliphatic carboxylic acid as a monomer unit include maleic acid homopolymers or copolymers, (meth) acrylic acid homopolymers or copolymers, and fumaric acid homopolymers. Examples thereof include a polymer and a copolymer. The cross-linking agent may in particular be a copolymer containing monomer units derived from maleic acid, which has two carboxyl groups. The crosslinking agent may be a commercially available product. Examples of commercially available cross-linking agents include "Gantrenz AN-119" (maleic acid-based copolymer) manufactured by Gokyo Sangyo Co., Ltd.

  Examples of the boron compound include borax, boric acid, boric acid complex and the like. The boron compound can advance the crosslinking reaction of the polyvinyl alcohol resin in the step of preparing a binder composition containing the same. Therefore, from the viewpoint of suppressing an excessive increase in viscosity of the binder composition, the boron compound may be used in the preparation of the binder composition in the state of a low concentration aqueous solution. For example, an aqueous solution having a concentration of 4.0% prepared by dissolving commercially available borax in water is used.

  The content of the cross-linking agent may be 1.0 part by mass or more based on 100 parts by mass of the polyvinyl alcohol resin. When the content of the cross-linking agent is 4.0 parts by mass or more, the water resistance of the binder tends to be further improved. From the same viewpoint, the content of the crosslinking agent may be 2.0 parts by mass or more, 6.0 parts by mass or more, or 7.0 parts by mass or more with respect to 100 parts by mass of the polyvinyl alcohol resin. The upper limit of the content of the cross-linking agent is not particularly limited, but from the viewpoint of economic efficiency, 100 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, relative to 100 parts by mass of the polyvinyl alcohol resin. Alternatively, it may be 10 parts by mass or less.

  When the binder composition contains a cross-linking agent, the mass of the cross-linked polyvinyl alcohol resin means the sum of the mass of the polyvinyl alcohol resin and the mass of the cross-linking agent. In the binder composition or the binder formed therefrom, not all of the cross-linking agent need form a covalent bond or a non-covalent bond with the hydroxyl group of the polyvinyl alcohol resin.

  The binder composition may further contain a crystallization accelerator. The polyvinyl alcohol resin physically crosslinked by the crystal structure in the resin can be obtained by increasing the crystallinity of the polyvinyl alcohol resin with a crystallization accelerator. As the crystallization accelerator, inorganic particles having a particle diameter of 1 μm or less (for example, talc or the like), crystalline organic substances (for example, carboxylic acid amide or the like), and the like can be used. The content of the crystallization accelerator may be 0.1 to 10 parts by mass with respect to 100 parts by mass of the crosslinked polyvinyl alcohol resin (or polyvinyl alcohol resin).

The binder composition according to the present embodiment contains a hydrazine derivative. The hydrazine derivative is a compound obtained by reacting hydrazine (N ₂ H ₄ ) with various compounds. Examples of the hydrazine derivative include a hydrazine salt compound, a pyrazole compound, a triazole compound, and a hydrazide compound. The hydrazine derivative may be a hydrazide compound from the viewpoint of availability. The hydrazide compound has at least one carboxylic acid hydrazide group represented by -CONHNH ₂ . The hydrazide compound may be, for example, a monohydrazide compound or a dihydrazide compound. Examples of the monohydrazide compound include propionic acid hydrazide (PHZ), salicylic acid hydrazide (SAH), and 3-hydroxy-2-naphthoic acid hydrazide (HNH). Examples of the dihydrazide compound include adipic acid dihydrazide (ADH), succinic acid dihydrazide (SUDH), sebacic acid dihydrazide (SDH), dodecanediohydrazide (DDH), and isophthalic acid dihydrazide (IDH). The hydrazide compound may be a polymer containing a constitutional unit having a carboxylic acid hydrazide group (for example, a polyacrylamide type aqueous crosslinking agent). The hydrazide compound may be a dihydrazide compound from the viewpoint of economy and availability, may be adipic acid dihydrazide or succinic acid dihydrazide from the viewpoint of availability and water solubility, and may be adipic acid dihydrazide from the economical viewpoint. May be

  From the viewpoint of more excellent restorability and more effective suppression of odor generation, the content of the hydrazine derivative is 100 parts by mass of the polyvinyl alcohol resin and the crosslinking agent when the binder composition contains the crosslinking agent. On the other hand, when the binder composition does not contain a crosslinking agent, 0.1 to 15.0 parts by mass, 0.8 to 5.0 parts by mass, and 0.8 with respect to 100 parts by mass of the polyvinyl alcohol resin. ˜2.0 parts by mass, or 0.9 to 1.5 parts by mass. Hereinafter, "total mass 100 parts by mass of polyvinyl alcohol resin and crosslinking agent" when the binder composition contains a crosslinking agent, and "mass 100 parts by mass of polyvinyl alcohol resin when the binder composition does not contain a crosslinking agent. In order to mean both of these, "100 parts by mass of crosslinked polyvinyl alcohol resin" may be used.

  The binder composition according to this embodiment contains an aqueous solvent. The aqueous solvent means water or a hydrophilic solvent compatible with water at an arbitrary ratio. The aqueous solvent can be used as a solvent or a dispersion medium for the components contained in the binder composition. Examples of the aqueous solvent include water, methanol, ethanol, ethylene glycol, glycerin and the like, and may be water from the viewpoint of economy and handleability. The aqueous solvent may be used alone or in combination of two or more.

  The pH of the binder composition according to this embodiment may be 7.0 to 10.0, 7.5 to 9.5, 8.1 to 9.5, or 8.8 to 9.2. When the pH of the binder composition is within this range, the corrosion of the mineral wool production facility can be prevented or suppressed. The pH can be adjusted, for example, by adjusting the content of the hydrazine derivative in the binder composition or adding a pH adjuster (for example, ammonia or various carboxylic acids). The pH can be measured with a pH test paper.

  The binder composition according to this embodiment may further contain a dustproofing agent. Examples of the dustproof agent include oil emulsions. Examples of commercially available dustproofing agents include heavy oil emulsion "Daphne Prosolvable PF" manufactured by Idemitsu Kosan Co., Ltd. The content of the dustproofing agent may be 1 to 30 parts by mass with respect to 100 parts by mass of the crosslinked polyvinyl alcohol resin.

  The binder composition according to this embodiment may further contain a water repellent. Examples of the water repellent include silicone-based additives such as silicone oil emulsion, and fluorine-based additives. Examples of commercially available water repellents include silicone oil emulsion "Polon MR" manufactured by Shin-Etsu Chemical Co., Ltd. The content of the water repellent may be 0.05 to 20 parts by mass with respect to 100 parts by mass of the crosslinked polyvinyl alcohol resin.

  The binder composition according to this embodiment may further contain a silane coupling agent. The silane coupling agent contributes to the interfacial adhesion between the crosslinked polyvinyl alcohol resin and the inorganic fiber. Examples of silane coupling agents include aminosilane coupling agents such as 3-aminopropyltriethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, aminopropyltriethoxysilane, and 3-glycidoxypropyl. Examples thereof include epoxysilane coupling agents such as trimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane. Examples of commercially available silane coupling agents include aminopropyltrimethoxysilane "KBE903" manufactured by Shin-Etsu Chemical Co., Ltd. The silane coupling agent may be used alone or in combination of two or more. The content of the silane coupling agent may be 0.1 to 3.0 parts by mass with respect to 100 parts by mass of the crosslinked polyvinyl alcohol resin, from the viewpoint of water solubility and reactivity of the polyvinyl alcohol resin and manufacturing cost. When the content of the silane coupling agent is 0.1 part by mass or more, sufficient interfacial adhesion between the crosslinked polyvinyl alcohol resin and the inorganic fiber can be easily obtained. The silane coupling agent also contributes to fixing the silicone-based additive on the surface of the inorganic fiber. Therefore, by using the silane coupling agent in combination with a water repellent such as a silicone-based additive, the water resistance of mineral wool can be further improved.

  The binder composition according to the present embodiment may further contain other components, if necessary, in addition to the components exemplified above. Examples of other components include an adhesion suppressant, a release agent and a colorant.

  The solid content concentration in the binder composition, that is, the content of components other than the aqueous solvent may be 2.0 to 20 mass% with respect to the total amount of the binder composition. When the content of the components other than the aqueous solvent is 2.0% by mass or more, the time required for the heat treatment for drying the mineral wool is shortened, and the productivity tends to be improved. When the content of the components other than the aqueous solvent is 20.0% by mass or less, the viscosity of the solution (binder composition) is sufficiently reduced and the permeability to the wool-like inorganic fiber is improved. From the same viewpoint, the content of components other than the aqueous solvent may be 2.0 to 10.0% by mass.

  The binder composition according to the present embodiment, for example, an aqueous solution containing a polyvinyl alcohol resin, a crosslinking agent and a hydrazine derivative, and, if necessary, a dustproofing agent, a water repellent, a silane coupling agent and other components, It can be obtained by mixing and stirring with water, and adding water as necessary to adjust the content of the above components. The reaction between the polyvinyl alcohol resin and the crosslinking agent proceeds during the preparation of the binder composition for mineral wool and / or by heating the binder composition for mineral wool.

  The mineral wool according to the present embodiment contains inorganic fibers and the above-described mineral wool binder composition attached to the inorganic fibers. Since the mineral wool according to this embodiment contains the aqueous solvent, it is wet and flexible, and thus can be molded into any three-dimensional shape.

  The mineral wool according to this embodiment contains inorganic fibers and a binder attached to the inorganic fibers. The binder contains a crosslinked polyvinyl alcohol resin and a hydrazine derivative. The mineral wool according to the present embodiment does not substantially contain an aqueous solvent and has an appropriate hardness, so that it can be used as a heat insulating material or a sound absorbing material installed in a wall or in the ceiling without subsequent processing. It is possible to use.

  Mineral wool is a wool-like fiber aggregate containing inorganic fibers, and the inorganic fibers are bound to each other via a binder or a binder composition. The inorganic fiber may be glass fiber, blast furnace slag containing silicic acid content and lime content as main components, or fiber made of rock or the like. Mineral wool containing glass fibers as inorganic fibers is generally called glass wool. Mineral wool containing, as inorganic fibers, blast furnace slag containing silicic acid content and lime content as main components, or fibers made from rocks or the like is generally called rock wool. The mineral wool may be glass wool containing glass fibers from the viewpoint of further improving heat insulation and sound absorption.

The density of mineral wool may be 10 to 250 kg / m ³ . The density and thickness of mineral wool can be measured according to JIS A 9521: 2014. The density here is an apparent density based on a volume including a void volume. The mineral wool may be mat-shaped, and the thickness of the mat-shaped mineral wool may be, for example, 10 to 300 mm.

  The fiber diameter of the inorganic fibers constituting the mineral wool (including the thickness of the binder) may be 3.0 to 10.0 μm, 3.5 to 8.0 μm, or 4.0 to 7.0 μm. The fiber diameter here is a value measured by the micronaire method. The fiber length of the inorganic fibers forming the mineral wool may be 2.0 to 500.0 mm.

  The binder is formed by heating the binder composition according to the above-described embodiment. That is, the binder can be a cured product of the binder composition or a heat-treated product.

  The amount of the binder attached may be 0.5 to 15.0 parts by mass, or 1.0 to 6.0 parts by mass with respect to 100 parts by mass of mineral wool. The amount of the binder attached can be measured by the method described in Examples below.

  Mineral wool according to the present embodiment, for example, a step of attaching the binder composition to the inorganic fiber, a step of forming a wool-like intermediate fiber substrate containing the inorganic fiber and the binder composition attached to the inorganic fiber, It can be manufactured by a method including a step of heat-treating a fiber base material. The intermediate fiber base material before the heat treatment may be used as it is as mineral wool.

  In the step of adhering the binder composition to the inorganic fiber, for example, while the inorganic raw material such as heat-melted glass or minerals such as rock is fibrous to form the inorganic fiber, the binder composition is formed on the formed inorganic fiber. May be attached. As a method for fiberizing the inorganic fiber, for example, a usual method such as a flame method, a blowing method, a centrifugal method (also referred to as a rotary method) or the like can be used. In the case of producing glass wool, a centrifugation method may be used as a method for making fibers. As a method of attaching the binder composition to the inorganic fibers, for example, a method of spraying the atomized binder composition onto the inorganic fibers with a spray device or the like can be used.

  By adhering the binder composition to the inorganic fibers and depositing the inorganic fibers to which the binder composition is attached, a wool-like intermediate fiber base material can be formed. The deposited inorganic fibers are gradually intertwined with each other to form a wool-like form. The binder composition may be attached to the inorganic fibers at any time after the inorganic fibers are formed, but since the binder composition is easily attached inside the intermediate fiber base material, the binder composition immediately after being formed may be used. A binder composition may be applied to the inorganic fibers and then a wool-like intermediate fiber substrate may be formed.

  By the heat treatment of the intermediate fiber base material, the binder composition attached to the inorganic fibers is heat-cured to form a binder, and the mineral wool containing the inorganic fibers and the binder attached to the inorganic fibers is obtained. The heat treatment method is not particularly limited. For example, the intermediate fiber base material can be heat-treated by passing it through one or more heating zones set to a predetermined heating temperature. The plurality of heating zones may be installed in series along the transportation direction of the intermediate fiber base material. The temperature of the heat treatment may be set so as to remove the aqueous solvent from the binder composition, and for example, the average heating temperature may be 200 ° C or higher, 200 ° C or higher and 250 ° C or lower, or 210 ° C or higher and 240 ° C or lower. May be When the average heating temperature is within these ranges, generation of an undried portion in the mineral wool (remaining of water) can be prevented or suppressed, and as a result, the resilience of the mineral wool is secured.

When the intermediate fiber base material is heat-treated by passing through n heating zones each of which can be set to a predetermined heating temperature, the average heating temperature T _ave is a value calculated by the following formula (1). In the formula (1), L _i represents the distance that the intermediate fiber base material is transported in each heating zone, and T _i represents the set temperature of each heating zone. i indicates the number of heating zones, which is an integer of 1 or more.

  The heat treatment time of the intermediate fiber base material is appropriately adjusted depending on the density and thickness of the inorganic fiber to which the binder composition is attached. The heat treatment time may be, for example, 30 seconds to 10 minutes, or 2 minutes to 10 minutes.

  The intermediate fiber base material after the heat treatment step, that is, mineral wool, may be formed into a mat shape, for example, if necessary, and further cut into a desired width and length.

  The mineral wool may be used as it is, or the surface of the mineral wool may be covered with a skin material to produce a member such as a panel having the mineral wool and the skin material. The skin material is not particularly limited, but includes, for example, paper (particularly heat resistant paper, for example, glass paper), synthetic resin film, metal foil film, non-woven fabric (for example, glass chopped strand mat), woven fabric (for example, glass fiber woven fabric). ) Or a combination thereof.

  The mineral wool according to this embodiment can be preferably used as a material having a heat insulating / sound absorbing function, for example. In particular, the mineral wool according to the present embodiment can be particularly suitably used as a heat insulating material for building materials (in particular, a heat insulating material arranged inside a building material such as inside a wall or ceiling).

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

<Preparation of binder composition>
Example 1
(A) Polyvinyl alcohol resin having a degree of polymerization of 300 and a degree of saponification of 88% ("JL-05E" manufactured by Nippon Vine & Poval Co .; aqueous solution) 92.5 parts by mass (solid content conversion), (B) Maleic acid-based copolymer containing maleic acid as a monomer unit as a cross-linking agent ("Gantrenz AN-119" manufactured by Gokyo Sangyo Co., Ltd .; aqueous solution) 7.5 parts by mass (solid content conversion), (C-1 ) 1.0 part by mass of adipic acid dihydrazide, (D) 15.0 parts by mass of heavy oil emulsion (“Daphne Prosolvable PF” manufactured by Idemitsu Kosan Co., Ltd.) that is a dustproof agent (solid content conversion), (E) repellent 5.0 parts by mass (solid content) of silicone oil emulsion (“Polon MR” manufactured by Shin-Etsu Chemical Co., Ltd.) which is a liquid agent, and 0.5 parts by mass of γ-aminopropyltriethoxysilane which is (F) a silane coupling agent. (Solid conversion ) Was mixed and stirred, and the solid content concentration of the obtained mixed liquid was adjusted with water so as to be 4.0% by mass to obtain a binder composition of Example 1. The pH of the obtained binder composition was 9.0. Here, the pH was measured with a pH test paper. The "solid content" here is the amount of solid components remaining after volatilization and drying of the aqueous solvent (content of components other than the aqueous solvent).

Example 2
A binder composition of Example 2 was obtained in the same manner as in Example 1 except that the silicone oil emulsion (E) which was a water repellent was not mixed. The pH of the obtained binder composition was 9.0.

Example 3
A binder composition of Example 3 was obtained in the same manner as in Example 2 except that the amount of (C-1) adipic acid dihydrazide was changed to 0.6 part by mass. The pH of the obtained binder composition was 8.7.

Example 4
A binder composition of Example 4 was obtained in the same manner as in Example 2 except that the amount of (C-1) adipic acid dihydrazide was changed to 10.0 parts by mass. The pH of the obtained binder composition was 9.5.

Example 5
A binder composition of Example 5 was obtained in the same manner as in Example 2 except that (C-1) adipic acid dihydrazide was changed to (C-2) succinic acid dihydrazide. The pH of the obtained binder composition was 9.0.

Example 6
A binder composition of Example 6 was obtained in the same manner as in Example 3 except that (C-1) adipic acid dihydrazide was changed to (C-2) succinic acid dihydrazide. The pH of the obtained binder composition was 8.7.

Comparative Example 1
A binder composition of Comparative Example 1 was obtained in the same manner as in Example 1 except that (C-1) adipic acid dihydrazide was not mixed. The pH of the obtained binder composition was 8.0.

Comparative example 2
A binder composition of Comparative Example 2 was obtained in the same manner as in Example 2 except that (C-1) adipic acid dihydrazide was not mixed. The pH of the obtained binder composition was 8.0.

Comparative Example 3
A binder composition of Comparative Example 3 was obtained in the same manner as in Example 1 except that the amount of the polyvinyl alcohol resin (A) was changed to 100 parts by mass and the maleic acid-based copolymer (B) was not mixed. The pH of the obtained binder composition was 9.0.

(Manufacture of glass wool)
The heat-melted raw material glass was introduced into a fiberizing device, and the heat-melted raw material glass was ejected into a fibrous state by a centrifugal method to form glass fibers. When the formed glass fiber was air-cooled, each binder composition of Examples 1 to 6 or Comparative Examples 1 to 3 was atomized and blown to adhere the binder composition to the glass fiber. The glass fibers with the binder composition attached were deposited to form a wool-like intermediate fiber substrate.

  The obtained intermediate fiber base material was heat-treated under the conditions of an average heating temperature of 220 ° C. and a heating time of 3 minutes. As a result, matte glass wool containing the glass fiber to which the binder was attached was obtained. By the heat treatment, a binder containing a polyvinyl alcohol resin cross-linked with the maleic acid-based copolymer as a cross-linking agent was formed.

(Fiber diameter, density, thickness)
When the fiber diameter of the glass fiber forming the mineral wool and having the binder adhered thereto was measured by the micronaire method, it was 5.0 μm. When the density and thickness of the mineral wool were measured according to JIS A 9521: 2014, the density was 16 kg / m ³ and the thickness was 105 mm. The density here is an apparent density based on a volume including a void volume.

(Amount of binder attached)
First, the weight of glass wool (weight before incineration) was measured, and then the binder was incinerated by heating in an air atmosphere at 500 ° C. for 30 minutes. The weight of the remaining glass fiber (weight after incineration) was measured, and the adhered amount of the binder was calculated by the following formula. In each of the glass wools of Examples and Comparative Examples, the amount of the adhered binder was 2.8 parts by mass based on 100 parts by mass of the glass wool.
Binder adhesion amount = (weight before incineration-weight after incineration) / weight before incineration x 100

(Evaluation of odor generation)
Whether or not odor was generated during the heat treatment of the intermediate fiber base material was evaluated. Here, when 0 out of 5 workers feel uncomfortable, “A”, when 1 or 2 workers feel uncomfortable, “B”, 3 to 5 workers When it was not comfortable, it was rated as "C". The evaluation results are shown in Tables 1 and 2.

(Restorability evaluation of glass wool)
Glass wool was compressed and packed in a plastic bag to have a thickness of 1/5 (that is, 21 mm). Then, the thickness T (mm) of the glass wool after 4 hours from unpacking this was measured, and the restoration rate (%) of the glass wool was calculated by the following formula.
Recovery rate (%) = T / 105 × 100

(Evaluation of dryness of glass wool)
Example 7
1000 sheets of the intermediate fiber base material obtained in the same manner as above using the binder composition of Example 1 were heat-treated at an average heating temperature of 210 ° C. for 3 minutes. Among 1000 sheets of glass wool after the heat treatment, none of them contained an undried portion.

Reference Example 1000 sheets of the intermediate fiber base material obtained in the same manner as above using the binder composition of Example 1 were heat-treated at an average heating temperature of 190 ° C. for 3 minutes. Among 1,000 sheets of glass wool after the heat treatment, there were two sheets containing an undried portion.

Claims (8)

A binder composition for mineral wool, containing a polyvinyl alcohol resin, a hydrazine derivative, and an aqueous solvent,
The binder composition may contain a crosslinking agent,
At least a part of the polyvinyl alcohol resin may be crosslinked by the crosslinker or not by the crosslinker,
When the binder composition contains the cross-linking agent, the binder composition does not contain the cross-linking agent with respect to a total mass of 100 parts by mass of the polyvinyl alcohol resin and the cross-linking agent. At this time, the binder composition for mineral wool is 0.1 to 15.0 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin.   When the binder composition contains the cross-linking agent, the binder composition does not contain the cross-linking agent with respect to a total mass of 100 parts by mass of the polyvinyl alcohol resin and the cross-linking agent. The binder composition for mineral wool according to claim 1, wherein the binder composition is 0.8 to 5.0 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin.   The binder composition for mineral wool according to claim 1 or 2, wherein the binder composition for mineral wool has a pH of 7.0 to 10.0.   Mineral wool containing inorganic fiber and the binder composition for mineral wool according to any one of claims 1 to 3 attached to the inorganic fiber. Inorganic fiber, including a binder attached to the inorganic fiber,
Mineral wool in which the binder contains a crosslinked polyvinyl alcohol resin and a hydrazine derivative.   The mineral wool according to claim 5, wherein the amount of the binder attached is 0.5 to 15.0 parts by mass with respect to 100 parts by mass of the mineral wool. Attaching a binder composition for mineral wool according to any one of claims 1 to 3 to an inorganic fiber,
A step of forming a wool-like intermediate fiber base material containing the inorganic fiber and the binder composition for mineral wool attached to the inorganic fiber;
A step of heat-treating the intermediate fiber base material to obtain mineral wool having the inorganic fibers and a binder formed from the binder composition for mineral wool.   The method according to claim 7, wherein the intermediate fiber base material is heat-treated at an average heating temperature of 200 ° C or higher to obtain the mineral wool.