WO2019111449A1 - Binder composition for mineral wool, mineral wool, and production method for mineral wool - Google Patents

Abstract

Disclosed is a binder composition for mineral wool, the composition comprising: a poly(vinyl alcohol) resin; an isocyanate compound having two or more reactive groups selected from among an isocyanate group and blocked isocyanate groups; and an aqueous medium. The isocyanate compound is contained in an amount of 12-90 parts by mass per 100 parts by mass of the contained poly(vinyl alcohol) resin.

Description

Binder composition for mineral wool, method for producing mineral wool and mineral wool

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

In mineral wool such as glass wool or rock wool, a binder (a binder for mineral wool) is used to bond the fibers.

Conventionally, a binder mainly composed of a phenol resin has been used for mineral wool. In recent years, polyvinyl alcohol resin may be used as a binder in place of phenol resin because of health concerns to formaldehyde emitted from phenol resin. For example, Patent Document 1 discloses an inorganic material obtained by mixing a water-soluble polymer containing a polyvinyl alcohol resin as a main component, a crosslinking agent, an adhesion inhibitor, a silane coupling agent, and a releasing agent. There is disclosed a water-soluble binder for inorganic fibers, which is a water-soluble binder for fibers, and its cured product has excellent elasticity and water resistance.

JP, 2016-108707, A

The present inventors have found that mineral wool using a binder containing polyvinyl alcohol as a main component sometimes lacks hardness when heated as compared to mineral wool using a binder containing a phenol resin as a main component. It was found that there is room for improvement in the handleability in a heated state, such as when taking out mineral wool after press molding.

Moreover, when the inventors examined the composition of the binder for the purpose of improving the hardness at the time of heating, depending on the composition of the binder, while the hardness at the time of heating is improved, an odor is generated at the time of heating Found a new problem that this would impair the workability.

Then, the main object of the present invention is mineral wool which improves hardness at the time of heating of mineral wool, and makes it possible to control generation of an odor about mineral wool using a binder containing polyvinyl alcohol resin. It is providing a binder composition.

One aspect of the present invention relates to a binder composition for mineral wool comprising a polyvinyl alcohol resin, an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group, and an aqueous solvent. In the binder composition for mineral wool, the content of the isocyanate compound may be 12 to 90 parts by mass with respect to 100 parts by mass of the content of the polyvinyl alcohol resin.

The binder composition may further contain a surfactant. In the binder composition, the surfactant may be a nonionic surfactant.

In the binder composition, the isocyanate compound may be a hexamethylene diisocyanate-based isocyanate compound, a diphenylmethane diisocyanate-based isocyanate compound, a blocked hexamethylene diisocyanate-based isocyanate compound, or a blocked diphenylmethane diisocyanate-based isocyanate compound.

One aspect of the present invention relates to an intermediate fiber substrate containing an inorganic fiber and the binder composition attached to the inorganic fiber.

Another aspect of the present invention relates to mineral wool comprising inorganic fibers and a binder attached to the inorganic fibers. In mineral wool, the binder contains a polyvinyl alcohol resin and an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group, and the polyvinyl alcohol resin is crosslinked by the isocyanate compound. In the binder composition for mineral wool, the content of the isocyanate compound may be 12 to 90 parts by mass with respect to 100 parts by mass of the content of the polyvinyl alcohol resin.

Another aspect of the present invention is a process of attaching the above-mentioned binder composition to inorganic fibers, a process of forming a wool-like intermediate fiber base material comprising inorganic fibers and the above-mentioned binder composition attached thereto, and an intermediate process Heating the fibrous substrate to obtain mineral wool having inorganic fibers and a binder formed from the above binder composition, and a method of producing mineral wool.

In addition, another aspect of the present invention comprises the steps of heating the intermediate fiber substrate to obtain mineral wool having inorganic fibers and a binder formed from the binder composition for mineral wool. It relates to a method of producing wool.

According to one aspect of the present invention, with respect to mineral wool using a binder containing a polyvinyl alcohol resin, the hardness at the time of heating of the mineral wool is improved, and it is possible to suppress generation of odor. A binder composition is provided. Moreover, according to one aspect of the present invention, a mineral wool using a binder composition containing a polyvinyl alcohol resin is improved in hardness upon heating and generation of odor is suppressed, and a method for producing the same Can be provided.

It is a sectional view showing glass wool 1 as one embodiment of 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 (hereinafter, also simply referred to as "binder composition") according to the present embodiment is a polyvinyl alcohol resin, and an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group. 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 product of polyvinyl alcohol resin. The crosslinked polyvinyl alcohol resin may be a polyvinyl alcohol resin chemically crosslinked by a crosslinking agent. Here, the crosslinked polyvinyl alcohol resin means a polyvinyl alcohol resin which is at least partially chemically crosslinked.

The polymerization degree of the polyvinyl alcohol resin may be, for example, in the range of 300 to 3000, in the range of 350 to 1000, and in the range of 400 to 800. The degree of polymerization of the polyvinyl alcohol resin is, for example, a value of the average degree of polymerization determined by the method defined in JIS K 6726: 1994. The degree of saponification of the polyvinyl alcohol resin may be, for example, in the range of 60 to 100 (mol%), and may be in the range of 75 to 99 (mol%). The degree of saponification of the polyvinyl alcohol resin can be determined, for example, by the method defined in JIS K 6726: 1994. Examples of commercially available products of polyvinyl alcohol resins include “JL-05E” (degree of polymerization: 500, degree of saponification: 80 to 84 (mol%)) manufactured by Nippon Shokuhin Biba-Poval.

The binder composition for mineral wool according to the present embodiment contains, as a crosslinking agent, an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group (hereinafter, also simply referred to as "isocyanate compound"). . Blocked isocyanate groups are obtained by blocking isocyanate groups with a blocking agent. Examples of blocking agents include methyl ketoxime and caprolactam. The isocyanate compound may be an isocyanate compound having two or more blocked isocyanate groups.

As the isocyanate compound, hexamethylene diisocyanate (HDI) based isocyanate compound, diphenylmethane diisocyanate (MDI) based isocyanate compound, toluene diisocyanate (TDI) based isocyanate compound, blocked HDI based isocyanate compound, blocked MDI based isocyanate compound, or And blocked TDI-based isocyanate compounds, which may be HDI-based isocyanate compounds, MDI-based isocyanate compounds, blocked HDI-based isocyanate compounds, or blocked MDI-based isocyanate compounds, HDI-based isocyanate compounds, Alternatively, it may be a blocked HDI based isocyanate compound. Here, the HDI-based isocyanate compound means hexamethylene diisocyanate or an oligomer (for example, a 2- to 10-mer) of hexamethylene diisocyanate, which may be hexamethylene diisocyanate. Further, the MDI-based isocyanate compound means diphenylmethane diisocyanate or an oligomer (for example, a 2- to 10-mer) of diphenylmethane diisocyanate, and may be diphenylmethane diisocyanate. Further, TDI-based isocyanate compound means toluene diisocyanate or an oligomer (for example, 2- to 10-mer) of toluene diisocyanate, and may be toluene diisocyanate.

The isocyanate compound may be a commercially available product. Examples of commercially available isocyanate compounds include "Elastron BN 11", "Elastron BN 77" and "F 2462 D 1" manufactured by Daiichi Kogyo Seiyaku Co., Ltd. .

The content of the isocyanate compound may be 12 to 90 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin. When the content of the isocyanate compound is 12 parts by mass or more, the generation of an odor is further suppressed. Moreover, the hardness at the time of a heating improves further that content of an isocyanate compound is 90 mass parts or less. The content of the isocyanate compound may be 14 to 70 parts by mass, 16 to 50 parts by mass, 18 to 40 parts by mass, or 20 to 30 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin.

The total content of the polyvinyl alcohol resin and the isocyanate compound is more excellent in economy for industrial production with respect to the total amount of components other than the aqueous solvent of the binder composition (hereinafter, also simply referred to as “solid content”). It may be 70 to 92% by mass, 80 to 91% by mass, or 85 to 90% by mass.

The binder composition for mineral wool of the present embodiment may contain a crosslinking agent other than the isocyanate compound. The crosslinking agent other than the isocyanate compound may have two or more reactive groups that react with the hydroxyl group of the polyvinyl alcohol resin to form a covalent bond or a noncovalent bond, and examples thereof include aliphatic carboxylic acids, The homopolymer or copolymer which contains aliphatic carboxylic acid as a monomer unit, a boron compound, or these combination is mentioned. The proportion of the isocyanate compound based on the total mass of the crosslinking agent may be more than 50 mass%, 70 mass% or more, 80 mass% or more, 90 mass% or more, or 95 mass% or more.

In the binder composition or the binder formed therefrom, it is not necessary for all of the crosslinking agents to form a covalent or non-covalent bond with the hydroxyl group of the polyvinyl alcohol resin.

The binder composition according to the present embodiment contains an aqueous solvent. The aqueous solvent means water or a hydrophilic solvent compatible with water in any proportion. The aqueous solvent can be used as a solvent or 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, which 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 in this range, the corrosion of mineral wool production equipment can be prevented or suppressed. Adjustment of pH can be performed, for example, by addition of a pH adjuster (eg, ammonia, various carboxylic acids). The pH can be measured by pH test paper.

The binder composition according to the present embodiment may further contain a surfactant. As surfactant, nonionic surfactant and anionic surfactant are mentioned, for example. The surfactant may be a nonionic surfactant from the viewpoint of further improving the hardness of the mineral wool at the time of heating.

The binder composition according to the present embodiment may further contain a dustproof agent. An oil emulsion etc. are mentioned as a dustproof agent. As an example of a commercial item of a dustproof agent, heavy oil emulsion "Daphny prosolvable PF" by Idemitsu Kosan Co., Ltd. is mentioned. The content of the dustproof 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 the present embodiment may further contain a water repellent. As a water repellent, silicone type additives, such as a silicone oil emulsion, and a fluorine type additive are mentioned, for example. As an example of a commercial item of a water repellent, silicone oil emulsion "Polon MR" by Shin-Etsu Chemical Co., Ltd. is mentioned. 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 the present 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. As a silane coupling agent, aminosilane coupling agents such as 3-aminopropyltriethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, aminopropyltriethoxysilane, 3-glycidoxypropyl Examples thereof include epoxy silane coupling agents such as trimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane. As an example of the commercial item of a silane coupling agent, Shin-Etsu Chemical Co., Ltd. aminopropyl trimethoxysilane "KBE903" is mentioned. One type of silane coupling agent may be used alone, or two or more types may be used in combination. 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 cross-linked polyvinyl alcohol resin from the viewpoint of water solubility and reactivity of the polyvinyl alcohol resin, and the production cost. When the content of the silane coupling agent is 0.1 parts by mass or more, sufficient interfacial adhesion between the crosslinked polyvinyl alcohol resin and the inorganic fiber is easily obtained. The silane coupling agent also contributes to the fixing of the silicone additive to the inorganic fiber surface. Therefore, the water resistance of mineral wool can be further improved by using it in combination with a water-repellent agent such as a silane coupling agent and a silicone-based additive.

The binder composition according to the present embodiment may further contain other components as necessary in addition to the components exemplified above. Other components include adhesion inhibitors, mold release agents, colorants, and dihydrazides that contribute to shape retention of mineral wool.

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% by mass with respect to the total amount of the binder composition. When content of components other than an aqueous solvent is 2.0 mass% or more, the time which the heat processing for drying mineral wool requires becomes short, and there exists a tendency for productivity to improve. The viscosity of a solution (binder composition) fully falls that content of components other than an aqueous solvent is 20.0 mass% or less, and the permeability with respect to a wool-like inorganic fiber becomes favorable. 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 includes, for example, an aqueous solution containing a polyvinyl alcohol resin, and an isocyanate compound, and, if necessary, a dustproof agent, a water repellant, a silane coupling agent and other components together with water. It mixes and stirs, and if necessary, water is added and it is obtained by adjusting content of the said component. In addition, reaction of polyvinyl alcohol resin and an isocyanate compound advances by heating the binder composition for mineral wool during preparation of the binder composition for mineral wool, and / or.

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

The mineral wool which concerns on this embodiment contains an inorganic fiber and the binder adhering to the inorganic fiber. In mineral wool, the binder contains a polyvinyl alcohol resin and an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group, and the polyvinyl alcohol resin is crosslinked by the above-mentioned isocyanate compound. The content of the isocyanate compound may be 12 to 90 parts by mass with respect to 100 parts by mass of the content of the polyvinyl alcohol resin. The mineral wool according to the present embodiment is substantially free of an aqueous solvent and has an appropriate hardness, so it is used as a sound absorbing material for automobiles and other complicated objects without further processing. Can be used as heat insulation, sound absorption material, etc.

Mineral wool is a wool-like fiber assembly containing inorganic fibers, and inorganic fibers are bound to each other via a binder or a binder composition. The inorganic fibers may be glass fibers, or blast furnace slag mainly composed of silicon and lime components, or fibers made from rocks or the like. Mineral wool containing glass fibers as inorganic fibers is generally referred to as glass wool. As mineral fibers, blast furnace slag mainly composed of silicic acid and lime, or mineral wool containing fibers derived from rocks and the like is generally called rock wool. Mineral wool may be glass wool containing glass fibers from the viewpoint of better heat insulation and sound absorption. FIG. 1 is a cross-sectional view showing glass wool 1 as one embodiment of mineral wool.

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

The fiber diameter (including the thickness of the binder) of the inorganic fibers constituting the mineral wool 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 Micronea method. The fiber length of the inorganic fibers constituting the mineral wool may be 2.0 to 500.0 mm.

A binder is formed by heating the binder composition which concerns on the above-mentioned embodiment. That is, the binder can also be referred to as a cured product or a heat-treated product of the binder composition.

The adhesion amount of the binder 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 the mineral wool. The adhesion amount of a binder can be measured by the method as described in the Example mentioned later.

The mineral wool according to the present embodiment includes, for example, the step of attaching the above-mentioned binder composition to inorganic fibers, the step of forming a wool-like intermediate fiber base material comprising inorganic fibers and the binder composition attached thereto, And heating the fibrous substrate. Further, the intermediate fiber base before heating may be used as mineral wool as it is.

In the step of adhering the binder composition to the inorganic fiber, for example, a binder composition is formed on the inorganic fiber formed while fiberizing an inorganic raw material such as thermally melted glass or a mineral such as rock to form an inorganic fiber. May be attached. As a method of forming inorganic fibers, for example, a usual method such as a flame method, a blowing method, a centrifugal method (also referred to as a rotary method) can be used. In the case of producing glass wool, centrifugation may be used as a fiberization method. As a method of adhering the binder composition to the inorganic fiber, for example, a method of spraying a misty binder composition to the inorganic fiber by a spray device or the like can be used.

A wool-like intermediate fiber base can be formed by depositing the inorganic fiber to which the binder composition has been attached while attaching the binder composition to the inorganic fibers. The deposited inorganic fibers are gradually intertwined to form a wool-like form. The binder composition may be attached to the inorganic fiber at any time after the inorganic fiber is formed, but since the adhesion of the binder composition to the inside of the intermediate fiber substrate is easy, the binder composition may be attached immediately after the formation. The binder composition may be attached to the inorganic fibers and then a wooly intermediate fiber substrate may be formed.

By heating the intermediate fiber base, the binder composition attached to the inorganic fibers is heated and cured to form a binder, whereby mineral wool containing the inorganic fibers and the binder attached to the inorganic fibers is obtained. The method of heating the intermediate fiber base is not particularly limited. For example, the intermediate fiber substrate can be heated by passing through one or more heating zones set at a predetermined heating temperature. The plurality of heating zones may be installed in series along the transport direction of the intermediate fiber substrate. The heating temperature may be set to remove the aqueous solvent from the binder composition, and for example, the average heating temperature may be 200 ° C. or more, and is 200 ° C. or more and 250 ° C. or less, or 210 ° C. or more and 240 ° C. or less You may When the average heating temperature is in these ranges, the generation of the undried portion (remaining of water) in the mineral wool can be prevented or suppressed, and as a result, the recoverability of the mineral wool is secured.

When heating an intermediate fiber base material by passing n heating zones which can be set to each predetermined heating temperature, the average heating temperature _Tave is a value calculated by the following formula (1). In the formula (1), L _i represents a distance intermediate fiber substrate is carried in each heating zone, T _i denotes the set temperature of each heating zone. i represents the number of heating zones, which is an integer of 1 or more.

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

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

Mineral wool may be used as it is, or the surface of mineral wool may be coated with a skin material to make a member such as a panel having mineral wool and a skin material. The surface material is not particularly limited, but, for example, paper (especially 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 combinations thereof may be used.

The mineral wool according to the present embodiment can be suitably used, for example, as a material having a heat insulation / sound absorption function. In particular, the mineral wool according to the present embodiment can be particularly suitably used as a sound absorbing material for automobiles (in particular, a sound absorbing material disposed on the back of a bonnet).

Hereinafter, the present invention will be more specifically described by way of examples. However, the present invention is not limited to these examples.

<Preparation of Binder Composition>
Example 1
100 parts by mass (solid content conversion) of polyvinyl alcohol resin (NPLA-made "JL-05E"; aqueous solution) having a degree of polymerization of 300 and a degree of saponification of 88% (heavy oil emulsion as a dustproof agent) (Daphne Prosolvable PF manufactured by Idemitsu Kosan Co., Ltd.) 15.0 parts by mass (in terms of solid content), and 0.5 part by mass of γ-aminopropyltriethoxysilane as a silane coupling agent (in terms of solid content) The solution was mixed and stirred, and adjusted with water so that the solid content concentration of the obtained mixture became 4.0% by mass. A solution of blocked HDI-based isocyanate compound (made by Dai-ichi Kogyo Seiyaku Co., Ltd., trade name: Elastron BN11) containing a nonionic surfactant as a crosslinking agent in the obtained mixed solution, the content of polyvinyl alcohol resin being 100 It added so that content of a crosslinking agent (isocyanate compound) might be 25 mass parts (solid content conversion) with respect to mass, and the binder composition of Example 1 was obtained. The pH of the obtained binder composition was 9.0. Here, the pH was measured by pH test paper. The "solid content" here is the amount of the solid component (content of components other than the aqueous solvent) remaining after the aqueous solvent is evaporated and dried. In addition, addition of the solution of the said isocyanate compound was implemented just before making a binder composition adhere to glass fiber.

Example 2
Example 2 in the same manner as Example 1 except that a solution of blocked MDI isocyanate compound containing a nonionic surfactant (trade name: F2462D1 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used as a crosslinking agent. The binder composition of

Example 3
Example 3 of Example 3 in the same manner as Example 1 except that a solution of blocked TDI-based isocyanate compound containing a nonionic surfactant (manufactured by Meisei Chemical Co., Ltd., trade name: Maycanate TP10) was used as a crosslinking agent. A binder composition was obtained.

Example 4
The binder of Example 4 in the same manner as Example 1 except that a solution of blocked HDI-based isocyanate compound containing an anionic surfactant (made by Meisei Chemical Co., Ltd., trade name: SU268A) was used as a crosslinking agent. The composition was obtained.

Example 5
Example 5 in the same manner as Example 1 except that a solution of a blocked MDI-based isocyanate compound containing an anionic surfactant (product of Dai-ichi Kogyo Seiyaku Co., Ltd., trade name: Elastron BN77) was used as a crosslinking agent. The binder composition of

Comparative Example 1
A binder composition of Comparative Example 1 was obtained in the same manner as Example 1, except that the amount of the crosslinking agent was changed to 100 parts by mass.

Comparative example 2
A binder composition of Comparative Example 2 was obtained in the same manner as Example 1, except that the amount of the crosslinking agent was changed to 10 parts by mass.

(Manufacture of glass wool)
The heat-melted raw material glass was introduced into a fiberizing apparatus, and the heat-melted raw material glass was jetted into a fibrous form by a centrifugal method to form glass fibers. When the formed glass fibers were air-cooled, the binder compositions were adhered to the glass fibers by spraying each binder composition of the example or the comparative example in a mist form. The glass fibers with the binder composition attached were deposited to form a wooly intermediate fiber substrate. At this time, the moisture content of the obtained intermediate fiber base was 5% or less.

The obtained intermediate fiber base material was prepared at a basis weight of 1000 g / m ² , heated under conditions of an average heating temperature of 200 ° C., a heating time of 5 minutes, and press-formed into a shape of 300 mm × 300 mm × 15 mm. As a result, mat-like glass wool containing glass fiber to which a binder was attached was obtained. By heating, a binder containing a polyvinyl alcohol resin crosslinked by an isocyanate compound was formed.

(Attachment amount of binder)
First, the mass (mass before incineration) of glass wool was measured, and then the binder was incinerated by heating for 30 minutes under the condition of 500 ° C. in an air atmosphere. The mass (mass after incineration) of the glass fiber which remained was measured, and the adhesion amount of the binder was computed by the following formula. The amount of the binder attached was 3.1 parts by mass with respect to 100 parts by mass of the glass wool in any of the glass wools of the examples and the comparative examples.
Binder adhesion amount = (mass before incineration-mass after incineration) / mass before incineration x 100

(Evaluation of odor (press workability))
After glass wool was obtained by press molding, the glass wool was taken out without cooling the press molding machine. At this time, ten workers performed the same work, and the case where two or less workers felt uncomfortable with the odor was "A", and the case where three or more workers were "C". The results are shown in Table 1.

(Evaluation of hardness during heating)
After the glass wool was obtained by press molding, the hardness at the time of heating was evaluated by taking out the glass wool without cooling the press molding machine. At this time, when holding the center of one side of glass wool with a glove and taking it out, the thing which was bent by dead weight was made into "C", and the thing which is not so was made into "A". The results are shown in Table 1.

(Measurement of load fluctuation during heating)
In order to quantitatively compare the degree of improvement in hardness of glass wool at the time of heating by the binder composition, the load fluctuation at the time of heating is as follows for the binder composition in which the hardness evaluation at the time of heating is “A”. The amount was measured. The results are shown in Table 1.

First, water was added to the binder compositions of Example and Comparative Example 1 to adjust the solid content concentration to 2%. A binder composition adjusted in solid content is impregnated with glass paper (manufactured by Whatman, trade name: GF / A 70 mm in diameter), and then dried at 180 ° C. for 10 minutes, and the width is 30 mm and the length is 50 mm. It cut out to size and produced the sample for measurement.

Next, the measurement sample was held with a jig so that the length of the portion not fixed to the jig was 30 mm from the short side of the manufactured measurement sample, and the measurement sample was held horizontally. Next, a 1 g double clip (13 mm in width) was attached as a weight to the tip of the measurement sample not fixed to the jig. When attaching the double clip, the measurement sample was inserted into the double clip so that the tip of the measurement sample reached the back of the double clip's clip.

Next, in a state of being attached to a jig, the measurement sample was placed in a constant temperature bath at 220 ° C. (manufactured by Yamato Scientific Co., Ltd., trade name: DN43N) and heated, and after 10 minutes, the measurement sample was taken out.

Next, the double clip is removed, and the amount of sag of the tip not fixed to the jig of the measurement sample based on the position of the tip not fixed to the jig of the measurement sample before attaching the double clip (heating load fluctuation) Was measured. The results are shown in Table 1. Here, as the load fluctuation amount at the time of heating is smaller, it means that the degree of improvement of the hardness of the glass wool by the binder composition is larger.

1 ... Glass wool

Claims (8)

Polyvinyl alcohol resin,
An isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group,
A binder composition for mineral wool, comprising: an aqueous solvent;
A binder composition for mineral wool, wherein the content of the isocyanate compound is 12 to 90 parts by mass with respect to 100 parts by mass of the content of the polyvinyl alcohol resin. The binder composition for mineral wool according to claim 1, further comprising a surfactant. The binder composition for mineral wool according to claim 2, wherein the surfactant is a nonionic surfactant. The said isocyanate compound is a hexamethylene diisocyanate-type isocyanate compound, a diphenylmethane diisocyanate-type isocyanate compound, the blocked hexamethylene diisocyanate-type isocyanate compound, or the blocked diphenylmethane diisocyanate-type isocyanate compound any one of Claims 1-3. The binder composition for mineral wool as described in a term. An intermediate fiber base material comprising an inorganic fiber and the binder composition for mineral wool according to any one of claims 1 to 4 attached to the inorganic fiber. Containing inorganic fibers and a binder attached to the inorganic fibers,
The binder comprises a polyvinyl alcohol resin, and an isocyanate compound having two or more reactive groups selected from an isocyanate group and a blocked isocyanate group,
The polyvinyl alcohol resin is crosslinked by the isocyanate compound,
Mineral wool wherein the content of the isocyanate compound is 12 to 90 parts by mass with respect to 100 parts by mass of the content of the polyvinyl alcohol resin. Attaching the mineral wool binder composition according to any one of claims 1 to 4 to inorganic fibers;
Forming a wooly intermediate fiber substrate comprising the inorganic fibers and the mineral wool binder composition attached thereto;
Heating the intermediate fiber substrate to obtain mineral wool having the inorganic fibers and the binder formed from the binder composition for mineral wool, and producing mineral wool. A method for producing mineral wool comprising heating the intermediate fiber base according to claim 5 to obtain mineral wool having the inorganic fiber and the binder formed from the binder composition for mineral wool. .

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