JP7432539B2 - Glass wool board and method for manufacturing glass wool board - Google Patents

Description

The present invention relates to a glass wool board and a method for manufacturing a glass wool board.

Glass wool molded bodies have properties such as light weight, heat insulation, sound insulation, and sound absorption, so they are widely used in many fields such as construction materials; means of transportation such as automobiles, ships, and aircraft; and electrical appliances such as refrigerators and freezers. It is used. Glass wool molded bodies are generally manufactured by molding glass wool using a binder. As the binder, organic binders such as phenol resin, epoxy resin, acrylic resin, and starch; and inorganic binders such as water glass, boric acid, and colloidal silica are known. However, when a low-density glass wool molded body using a binder is irradiated with a burner, holes are formed, resulting in poor fire resistance. Furthermore, in order to improve the heat insulation properties, it is necessary to increase the thickness of the glass wool molded body, which poses a problem that it cannot be used in areas with limited space.

Therefore, in areas where space is limited, vacuum insulation materials are widely used in which a glass wool molded body is placed in an airtight pack and the inside of the pack is brought into a reduced pressure state to improve heat insulation properties. In vacuum insulation materials, in order to maintain vacuum over a long period of time, a core material made of glass wool molding is inserted into an outer shell made of multiple laminated layers, and the interior is kept in a vacuum state. , a glass wool molded body using a binder is used.

However, when an organic binder is used, there is a problem that the degree of vacuum of the vacuum insulation material decreases due to volatile components from the binder.Also, due to the heat resistance of the organic binder, high temperatures cannot be applied when forming glass wool. There is a problem. Further, when an inorganic binder is used, particularly when boric acid is used, there is a problem that the degree of vacuum decreases due to volatilization of bound water, making it impossible to maintain heat insulation properties. For this reason, when a binder is used, it is necessary to increase the amount of gas component adsorbent or fill with a high-performance adsorbent in order to stabilize the performance of the vacuum insulation material over a long period of time.

For the above reasons, various methods have been developed for producing core materials for vacuum insulation materials that do not use binders and have good handling properties.

For example, Patent Document 1 discloses a method in which glass fiber aggregates are press-molded at a temperature higher than the heat deformation temperature of glass wool, and plastically deformed to the state at the time of pressurization, thereby maintaining the shape. . Patent Document 2 discloses a method of forming laminated glass white wool (glass wool containing no binder) at a temperature 20° C. higher than its deformation point. However, in the methods of Patent Documents 1 and 2, pressure molding is performed at a temperature higher than the heat deformation temperature of glass wool, which requires a huge amount of energy, and also has the problem that the fiber strength decreases and the glass wool becomes easily powdered. there were.

Patent Document 3 discloses a core material in which inorganic fibers are adhered to each other by intermolecular interaction caused by Si-OH groups, but in this invention, since the inorganic fibers are insufficiently bonded to each other, After a certain period of time after compression, the thickness of the glass wool molded body swells, causing a problem of decreased handling properties due to dimensional changes.

Further, Patent Documents 4 and 5 describe that when glass wool is manufactured by a spinner method, by spraying a mist of water on the glass wool that is floating in the air before being ejected from the small holes of the spinner and deposited, Moisture is attached to the surface of the glass wool, and the attached moisture is used to elute the sodium oxide contained in the glass that forms the glass wool.The eluted sodium oxide dissolves in the surrounding adhering water to produce sodium hydroxide, and this hydroxide Sodium easily reacts with silicon dioxide, the main component of glass wool, to produce sodium silicate, and this sodium silicate is water glass, which is well known as an inorganic binder, so it can bind fibers together without adding a binder. A manufacturing method is disclosed. However, water glass is highly alkaline, and the process of making glass wool with a water content of 0.05 to 10.0% by mass and press-forming it at a high temperature of 250 to 450°C requires a huge amount of energy and is safe. There were problems in terms of space, equipment, and cost.

Further, Patent Document 6 describes an impregnation step of impregnating a binder into glass wool, a molding step of molding glass wool containing the binder obtained in the impregnation step, and a drying step of removing moisture from the glass wool molded in the molding step. , the binder is an inorganic binder, and the molded product obtained in the drying process meets the flame retardant standards equivalent to JIS A 1322 flame retardant class 1 and/or Article 2, Item 9 of the Building Standards Act. A molded article that satisfies standards for noncombustible materials in prescribed combustion tests and a method for manufacturing the same are disclosed. However, this manufacturing method takes too much time to dry, resulting in problems in terms of productivity and cost. Further, when the molded body is irradiated with flame from a burner or the like, the molded body is melted by the flame and its thickness is reduced, so there is a problem that the heat insulation properties are lowered.

Patent No. 3580315 Special Publication No. 2003-532845 Patent No. 3578172 Patent No. 3712129 Japanese Patent Application Publication No. 2007-84971 Japanese Patent Application Publication No. 2016-160553

An object of the present invention is to provide a glass wool board that is lightweight, has excellent handling properties, and has excellent heat insulation, fire resistance, and noncombustibility, and a method for manufacturing the glass wool board.

As a result of intensive research to solve the above problems, the following invention was discovered.

(1) Contains a pulp-like material made of glass wool, glass fiber, and meta-aromatic polyamide, and the content of the pulp-like material made of meta-aromatic polyamide is 5% by mass or more and 15% by mass based on the total fiber components. A glass wool board having a density of 0.30 g/cm ³ or more and 0.55 g/cm ³ or less, and a thickness of 1 mm or more and 25 mm or less.

(2) The glass wool board according to (1) above, wherein the glass wool content is 45% by mass or more and 85% by mass or less, and the glass fiber content is 10% by mass or more and 40% by mass or less, based on the total fiber components. .

(3) In the method for manufacturing a glass wool board according to any one of (1) to (2) above, from a slurry containing a pulp-like material made of glass wool, glass fiber, and meta-aromatic polyamide. A method for manufacturing a glass wool board, comprising the steps of manufacturing wet paper using a wet papermaking method, laminating a plurality of sheets of wet paper, and heat-pressing the laminated wet paper to integrate them.

The glass wool board of the present invention contains a pulp-like material made of glass wool, glass fiber, and meta-aromatic polyamide. A pulp made of meta-aromatic polyamide gets between the fibers of glass wool and glass fibers, and when the water present in the crystal structure of the pulp made of meta-aromatic polyamide is removed by drying, meta The pulp-like material made of the aromatic polyamide shrinks significantly and exerts a binder effect that strengthens the fiber network, making it possible to achieve a board shape that is lightweight and has excellent handling properties.

Further, since the pulp-like material made of meta-aromatic polyamide has high heat resistance, the glass wool board can maintain the board shape and achieve the effect of having excellent fire resistance and noncombustibility. Furthermore, glass fiber has higher heat resistance than glass wool, has stronger single fiber strength, and is more rigid, which makes it easier to ensure the thickness of the glass wool board, prevents densification, and improves the hardness of the board. A glass wool board that is lightweight, has excellent handling properties and heat insulation properties can be obtained.

In addition, there is a process of manufacturing wet paper using a wet papermaking method from a slurry of a pulp-like material made of glass wool, glass fiber, and meta-aromatic polyamide, a process of laminating multiple sheets of laminated wet paper, and a process of heating the laminated wet paper. By manufacturing through a pressing and integrating process, it is possible to manufacture glass wool boards that are lightweight, yet have excellent heat insulation, fire resistance, and noncombustibility.

It is a surface observation image of the glass wool board of the present invention.

The glass wool board of the present invention contains a pulp-like material made of glass wool, glass fiber, and a meta-aromatic polyamide, and the content of the pulp-like material made of the meta-aromatic polyamide is 5% by mass based on the total fiber components. The density of the glass wool board is 0.30 g/cm ³ or more and 0.55 g/cm ³ or less, and the thickness is 1 mm or more and 25 mm or less. Further, it is preferable that the content of glass wool is 45% by mass or more and 85% by mass or less, and the content of glass fiber is 10% by mass or more and 40% by mass or less, based on the total fiber components.

In this specification, "glass wool board" may be abbreviated as "board".

In the present invention, glass wool is a cotton-like glass fiber with a fiber diameter of about 1 to 7 μm. Glass wool is manufactured by spouting molten glass by rotating a spinner at high speed, the circumference of which is provided with many small holes of about 1 mm. This manufacturing process is generally called the centrifugation method, and by adjusting the viscosity of the molten glass and the rotation speed, it is possible to economically manufacture thin glass wool of about 1 to 7 μm.

In the present invention, examples of the glass fiber include chopped strands and glass flakes. Any glass fiber may be used as long as it is hard to break and has the ability to form a board. The fiber diameter of the glass fiber is preferably 4 to 15 μm, more preferably 6 to 14 μm, and even more preferably 8 to 13 μm. If the fiber diameter is less than 4 μm, it is too fine and the glass fibers may fall off the board during wet papermaking, resulting in insufficient strength, thickness, and hardness of the board. When the fiber diameter exceeds 15 μm, the glass fiber becomes too thick, the gap between the boards becomes large, and the heat insulation properties may deteriorate. When the fiber diameter of the glass fiber is 4 to 15 μm, the gaps between the boards are fine and uniform, resulting in a board with excellent heat insulation, fire resistance, and noncombustibility.

Further, in the present invention, the fiber length of glass wool and glass fiber is preferably 1 to 20 mm, more preferably 4 to 15 mm, and even more preferably 6 to 13 mm. If the fiber length is less than 1 mm, the strength of the board may be insufficient or the glass wool or glass fibers may easily fall off the board surface. If the fiber length exceeds 20 mm, it will take time to disperse the fibers, reducing productivity. In some cases, the fibers tend to become tangled and clump, resulting in poor formation.

The content of glass wool is preferably 45 to 85% by mass, more preferably 50 to 80% by mass, and 55 to 75% by mass based on all fiber components contained in the glass wool board. is even more preferable. If the content is less than 45% by mass, the voids in the board may become large and the insulation properties may deteriorate; if the content exceeds 85% by mass, the board may deform when heat is applied to it. There is.

Further, the content of glass fiber is preferably 10 to 40% by mass, more preferably 15 to 35% by mass, and 20 to 30% by mass based on all the fiber components contained in the glass wool board. It is more preferable that If the content is less than 10% by mass, the board may become too thin or soft, resulting in poor handling. If the content exceeds 40% by mass, the board may become too hard. In some cases, the cuttability deteriorates, and because the voids become too large, the heat insulation properties may deteriorate.

In the present invention, the pulp-like material made of meta-aromatic polyamide includes pulp-like material made of poly(m-phenylene isophthalamide), poly(m-phenylene terephthalamide) resin, and the like.

In addition, in the present invention, the pulp-like material made of meta-aromatic polyamide refers to a thin leaf-like or scaly-like material having a large number of minute fibrils that can be made into a paper-like structure using a paper machine. It refers to fine heat-resistant fibers that are small pieces and have water molecules or moisture present in the crystalline structure in an amorphous state without a strong crystalline structure of the fibers. FIG. 1 is an electron micrograph of a glass wool board containing a pulp-like material made of meta-aromatic polyamide, and the pulp-like material is thin-sheet-like.

A pulp-like material made of meta-aromatic polyamide is obtained by introducing a fiber-forming polymer solution into an aqueous coagulation bath, collecting the product without drying, and subjecting it to beating etc. as necessary. Obtained by fibrillation. For example, fibrids produced by mixing a polymer solution with a precipitant in a system where shear force exists, and amorphous molecules with molecular orientation formed from a polymer solution exhibiting optical anisotropy. It is a water-containing product, and is produced by the manufacturing method described in, for example, Japanese Patent Publication No. 35-11851 and Japanese Patent Publication No. 37-5732. Beating treatment can be performed if necessary.

For the beating process, pulp-like materials are processed through refiners, beaters, mills, grinding equipment, rotary homogenizers that apply shearing force with high-speed rotating blades, and between the inner blade of a high-speed rotating cylinder and the fixed outer blade. A double cylindrical high-speed homogenizer that generates shearing force, an ultrasonic crusher that uses ultrasonic impact to atomize the fibers, and a pressure difference that applies to the fiber suspension to make it pass through a small diameter orifice at high speed, causing it to collide. It can be obtained by processing using a high-pressure homogenizer or the like that applies shearing force and cutting force to the fibers by rapidly decelerating the fibers.

In the present invention, the pulp-like material made of meta-aromatic polyamide shrinks greatly when water molecules or water present in the crystal structure are removed by heating, reduced pressure, etc., and in order to strengthen the fiber network, the board It has the effect of improving strength.

The mass-weighted average fiber length of the pulp-like material made of meta-aromatic polyamide is preferably 0.10 mm or more and 1.50 mm or less. Further, the length weighted average fiber length of the pulp-like material is preferably 0.10 mm or more and 1.00 mm or less. If the average fiber length is shorter than the preferred range, pulp-like material may fall off from the board. If the average fiber length is longer than the preferred range, tangles and poor dispersion of the pulp may occur.

If the pulp material made of meta-aromatic polyamide has the above mass-weighted average fiber length and length-weighted average fiber length, even if the content of the pulp material in the board is small, the difference between the pulp materials and A dense network structure of fibers is formed between the pulp material and the glass wool and glass fibers, making it easy to obtain a board with high tensile strength, and when multiple sheets of wet paper are laminated and integrated, there is no possibility of delamination between the layers. It becomes less likely to occur.

The average fiber width of the pulp-like material made of meta-aromatic polyamide is preferably 5 μm or more and 40 μm or less, more preferably 8 μm or more and 35 μm or less, and even more preferably 10 μm or more and 25 μm or less. When the average fiber width exceeds 40 μm, the network between the fibers deteriorates, and the tensile strength of the board may decrease or inorganic particles may become difficult to penetrate. On the other hand, if the average fiber width is less than 5 μm, the processing time for beating the pulp-like material may become too long, and productivity may drop significantly.

In the present invention, the mass-weighted average fiber length, length-weighted average fiber length, and average fiber width of the pulp-like material made of meta-aromatic polyamide are determined by the projected fiber length using Kajaani FiberLab V3.5 (manufactured by Metso Automation). These are the mass-weighted average fiber length (L(w)), length-weighted average fiber length (L(l)), and fiber width measured in the (Proj) mode.

In the present invention, the content of pulpy material made of meta-aromatic polyamide is 5% by mass or more and 15% by mass or less, and 6% by mass or more and 12% by mass or less with respect to all the fibers constituting the glass wool board. More preferably, the content is 7% by mass or more and 10% by mass or less. If the content of the pulp-like material made of meta-aromatic polyamide exceeds 15% by mass, the fire resistance or nonflammability of the board may deteriorate or the density of the board may become too high. On the other hand, if the content of the pulpy material made of meta-aromatic polyamide is less than 5% by mass, a dense network structure exists between the pulpy material made of meta-aromatic polyamide or between the pulpy material and glass wool and glass fibers. is difficult to form, the strength of the board tends to decrease, leading to a decrease in handling properties, and delamination may occur during the process of laminating, hot pressing, and integrating multiple sheets of wet paper.

In the present invention, the modified freeness of the pulp made of meta-aromatic polyamide is preferably 0 to 300 ml, more preferably 0 to 200 ml, and still more preferably 0 to 100 ml. If the modified freeness exceeds 300 ml, the fiber width of the pulp material is thick and fibrillation has not progressed very much, so the dense network with glass wool or glass fibers decreases, resulting in a decrease in the tensile strength of the board. There are cases where On the other hand, when the modified freeness is less than 0 ml, the fine content of the pulp-like material made of meta-aromatic polyamide increases too much, which increases the rate at which it falls off from the board, resulting in a decrease in yield. Furthermore, fibrillation of the fibers takes too much time and is very expensive. Additionally, the board tends to become thinner and more dense, which can lead to poor insulation properties. As the fibrillation of the pulp made of meta-aromatic polyamide progresses, the modified freeness continues to decrease. Even after the modified freeness reaches 0 ml, if the fibers are further fibrillated, the fibers will pass through the mesh, and the modified freeness will begin to increase. In the present invention, the state in which the modified freeness begins to rise in reverse is referred to as "the modified freeness is less than 0 ml."

In the present invention, modified freeness refers to JIS P8121-2:2012 except that an 80-mesh wire mesh with a wire diameter of 0.14 mm and an opening of 0.18 mm was used as the sieve plate, and the sample concentration was 0.1%. This is a value measured in accordance with .

In the present invention, in addition to the pulp-like material made of glass wool, glass fiber, and meta-aromatic polyamide, various fibers may be blended as necessary within a range that does not impair performance. As a result, the number of finer voids can be increased, and the heat insulation, fire resistance, and nonflammability can be improved. Such fibers include synthetic resin fibers such as benzoate, polychlor, phenol, melamine, furan, urea, aniline, unsaturated polyester, fluorine, silicone, and derivatives thereof, metal fibers, carbon fibers, alumina, silica, ceramics, Inorganic fibers such as rock fibers can be added. The content of fibers that can be blended as necessary is preferably 20% by mass or less, more preferably 15% by mass or less, and 10% by mass or less, based on all the fiber components contained in the glass wool board. It is more preferably less than % by mass, and there is no problem even if it is 0% by mass.

The synthetic resin fiber may be a fiber (single fiber) made of a single resin, or a composite fiber made of two or more resins. Examples of composite fibers include core-sheath type, eccentric type, side-by-side type, sea-island type, orange type, and multi-bimetal type. Further, the various types of fibers mentioned above that can be included in the glass wool board of the present invention may be used alone or in combination of two or more types.

In the present invention, the thickness of the board is 1 mm or more, more preferably 5 mm or more, and even more preferably 10 mm or more. Moreover, it is 25 mm or less, more preferably 23 mm or less, and even more preferably 20 mm or less. When the thickness of the board is within the above range, the board of the present invention is lightweight, has excellent handling properties, and has excellent heat insulation, fire resistance, and noncombustibility. Moreover, the workability of each process becomes good. If the thickness of the board exceeds 25 mm, the board may become too heavy and difficult to handle, or the drying time of the wet paper may become too long, leading to deterioration of productivity. If the thickness of the board is less than 1 mm, the strength of the board may be reduced and the handling properties may be significantly reduced. In addition, heat insulation properties, fire resistance, and nonflammability may be significantly impaired.

The density of the board in the present invention is 0.30 g/cm ³ or more, and more preferably 0.35 g/cm ³ or more. Moreover, it is 0.55 g/cm ³ or less, and more preferably 0.50 g/cm ³ or less. If the density is less than 0.30 g/ ^cm3 , the strength of the board, such as tensile strength, surface strength, and interlaminar strength, will be weak, and when the boards are rubbed together, the constituent fibers may fall off from the board surface. be. Furthermore, if the board is thin, the board may flex, causing delamination or breakage. On the other hand, if the density of the board exceeds 0.55 g/cm ³ and the board is thick, the board may become heavy, resulting in a reduced sense of lightness or an excessively high cost. However, if the thickness is the same, in the density range of the board mentioned above, the higher the density, the smaller the voids, the lower the heat conduction by gas, and the better the insulation.

In the board manufacturing method of the present invention, wet paper is manufactured by a wet papermaking method (papermaking method). In the wet papermaking method, fibers are dispersed in water to form a uniform slurry, and wet paper is produced from this slurry using a paper machine. Paper machines include, for example, paper machines in which a paper making wire such as fourdrinier, cylinder wire, inclined wire, inclined short screen, etc. is installed independently, and paper machines having two or more layers with two or more heads on the same paper making wire. Examples include a paper machine capable of producing multi-layer paper, a combination paper machine in which two or more types of paper-making wires of the same type or different types are installed online.

In addition to the fibers, a dispersant, a paper strength enhancer, a thickener, an inorganic filler, an organic filler, an antifoaming agent, and the like can be appropriately added to the slurry, if necessary. The solid content concentration of the slurry is preferably about 0.5 to 0.001% by mass. This slurry is further diluted to a predetermined concentration and subjected to wet papermaking to obtain wet paper.

Then, multiple sheets of wet paper are laminated. As a method for laminating a plurality of wet paper sheets, the wet paper paper may be wound around a cylindrical drum several times and then cut in the width direction of the cylindrical drum to obtain a flat-sized laminated wet paper paper. Further, a plurality of flat sheets of laminated wet paper can be further laminated.

Next, a plurality of laminated wet paper sheets are pressed using a heat press machine at a press temperature of 120 to 180° C. and a press pressure of 1 to 20 MPa to remove moisture from the wet paper and dry it. A board with a predetermined thickness can be formed. The pressing time may be adjusted appropriately depending on the time required for drying. In order to obtain a glass wool board with a predetermined thickness, the basis weight of the wet paper and the pressing pressure may be adjusted as appropriate.

FIG. 1 is an electron microscope (SEM) photograph of the surface of the board of the present invention. Pulp-like materials made of glass wool, glass fiber, and meta-aromatic polyamide contained in the board can be confirmed. A pulp-like material made of meta-aromatic polyamide is a thin leaf-like or flake-like piece having many minute fibrils, and it gets between glass wool and glass fibers and fills the gaps between the fibers.

In the present invention, an inorganic binder may be contained on the surface and inside of the board. Examples of the inorganic binder include sepiolite, colloidal silica, water glass, alumina sol, and bentonite. The above inorganic binders may be used alone or in combination of two or more.

The inorganic binder can be contained on the surface and inside of the glass wool board by applying an inorganic binder coating liquid to the glass wool board and then drying it. The medium for preparing the inorganic binder coating liquid is not particularly limited as long as it can uniformly dissolve or disperse the inorganic binder. For example, aromatic hydrocarbons such as toluene, ethers such as tetrahydrofuran, ketones such as methyl ethyl ketone, alcohols such as isopropyl alcohol, N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide, N, N-dimethylformamide, dimethyl sulfoxide, water, etc. can be used as necessary. Further, the medium used is preferably a medium that does not expand or dissolve the board.

The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples in any way. In addition, in the examples, all percentages (%) and parts are based on mass unless otherwise specified.

Example 1
<Preparation of pulp-like material made of meta-aromatic polyamide>
20 parts of polymetaphenylene isophthalamide with a logarithmic viscosity of 1.5 in sulfuric acid are dissolved in 90 parts of N,N-dimethylacetamide containing 5 parts of lithium chloride, and this solution is stirred at high speed with glycerin in a homomixer. A pulp-like material is obtained by introducing it into an aqueous solution, and this pulp-like material is passed through a single-disc refiner to be fibrillated to adjust the modified freeness. 65 ml) was obtained.

<Fabrication of board>
60 parts of glass wool manufactured by Mag Isobert, 30 parts of glass fiber (manufactured by Nitto Boseki, fiber diameter 10.5 μm x fiber length 6 mm), pulp-like material made of meta-aromatic polyamide (modified freeness 65 ml) 10 parts were dispersed in water using a pulper to prepare a uniform slurry with a concentration of 0.5%, and a wet paper with a dry basis weight of 100 g/m ² was obtained using a cylinder paper machine. The wet paper was wound around a cylindrical drum 10 times and then cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 1000 g/m ² . Two sheets of this wet paper having a dry basis weight of 1000 g/m ² were laminated to form a wet paper having a dry basis weight of 2000 g/m ² . This laminated wet paper was heat pressed using a 140° C. heat press machine at a pressure of 2 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 2000 g/m ² and a thickness of 5 mm.

Example 2
The dry basis weight was changed by using 53 parts of the glass wool used in Example 1, 40 parts of the glass fiber used in Example 1, and 7 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 122 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 1220 g/m ² . Three sheets of this wet paper with a dry basis weight of 1220 g/m ² were laminated to form a wet paper with a dry basis weight of 3660 g/m ² . This laminated wet paper was heat pressed at a pressure of 1.5 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 3660 g/m ² and a thickness of 10 mm. .

Example 3
The dry basis weight was changed by using 55 parts of the glass wool used in Example 1, 40 parts of the glass fiber used in Example 1, and 5 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 69 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 690 g/m ² . Ten sheets of this wet paper having a dry basis weight of 690 g/m ² were laminated to form a wet paper having a dry basis weight of 6900 g/m ² . This laminated wet paper was heat pressed at a pressure of 1.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 6900 g/m ² and a thickness of 23 mm. .

Example 4
The dry basis weight was changed by using 45 parts of the glass wool used in Example 1, 40 parts of the glass fiber used in Example 1, and 15 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper having a dry basis weight of 55 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 550 g/m ² . This laminated wet paper was heat pressed at a pressure of 5.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 550 g/m ² and a thickness of 1 mm. .

Example 5
The dry basis weight was changed by using 85 parts of the glass wool used in Example 1, 10 parts of the glass fiber used in Example 1, and 5 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 50 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 500 g/m ² . Ten sheets of this wet paper with a dry basis weight of 500 g/m ² were laminated to form a wet paper with a dry basis weight of 5000 g/m ² . This laminated wet paper was heat pressed at a pressure of 4.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 5000 g/m ² and a thickness of 10 mm. .

Example 6
The glass wool used in Example 1 was 73 parts, the glass fiber used in Example 1 was 20 parts, and the pulp material made of meta-aromatic polyamide used in Example 1 was 7 parts, and the dry basis weight was changed. Except for this, a wet paper having a dry basis weight of 67.5 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 675 g/m ² . Ten sheets of this wet paper having a dry basis weight of 675 g/m ² were laminated to form a wet paper having a dry basis weight of 6750 g/m ² . This laminated wet paper was heat pressed at a pressure of 3.0 MPa using a heat press machine at 140° C., and the wet paper was dried to produce a glass wool board with a basis weight of 6750 g/m ² and a thickness of 14 mm. .

Example 7
The same procedure as in Example 1 was prepared using 81 parts of the glass wool used in Example 1, 9 parts of the glass fiber used in Example 1, and 10 parts of the pulp-like substance made of meta-aromatic polyamide used in Example 1. A wet paper paper with a dry basis weight of 100 g/m ² was obtained by this method. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 1000 g/m ² . Two sheets of this wet paper having a dry basis weight of 1000 g/m ² were laminated to form a wet paper having a dry basis weight of 2000 g/m ² . This laminated wet paper was heat pressed at a pressure of 2.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 2000 g/m ² and a thickness of 5 mm. .

Example 8
The dry basis weight was changed by using 48 parts of the glass wool used in Example 1, 45 parts of the glass fiber used in Example 1, and 7 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 74 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 740 g/m ² . Five sheets of this wet paper with a dry basis weight of 740 g/m ² were laminated to form a wet paper with a dry basis weight of 3700 g/m ² . This laminated wet paper was heat pressed at a pressure of 1.5 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 3700 g/m ² and a thickness of 10 mm. .

Example 9
The dry basis weight was changed by using 40 parts of the glass wool used in Example 1, 50 parts of the glass fiber used in Example 1, and 10 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 87.5 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 875 g/m ² . Two sheets of this wet paper with a dry basis weight of 875 g/m ² were laminated to form a wet paper with a dry basis weight of 1750 g/m ² . This laminated wet paper was heat pressed at a pressure of 1.5 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 1750 g/m ² and a thickness of 5 mm. .

Example 10
The dry basis weight was changed by using 90 parts of the glass wool used in Example 1, 5 parts of the glass fiber used in Example 1, and 5 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper having a dry basis weight of 55 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 550 g/m ² . Ten sheets of this wet paper with a dry basis weight of 550 g/m ² were laminated to form a wet paper with a dry basis weight of 5500 g/m ² . This laminated wet paper was heat pressed at a pressure of 5.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 5500 g/m ² and a thickness of 10 mm. .

Comparative example 1
The same method as in Example 1 was used except that the glass wool used in Example 1 was changed to 80 parts, the glass fiber used in Example 1 was changed to 20 parts, and the dry basis weight was ^changed . Wet paper was obtained. Using a sprayer on top of this wet paper, a mixture of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., Snowtex (registered trademark) C): sepiolite (manufactured by Showa KDE Co., Ltd., Milcon (registered trademark) SP-2) = 80:20 was applied. A 20% aqueous solution was applied to give a dry mass of 20 g/m ² . 25 sheets of this wet paper with a dry basis weight of 150 g/m ² were laminated to form a wet paper with a dry basis weight of 3750 g/m ² . This laminated wet paper paper was dried using a hot air dryer at 140° C. to produce a glass wool board having a basis weight of 3750 g/m ² and a thickness of 14 mm.

Comparative example 2
In the same manner as in Example 1, except that 90 parts of the glass wool used in Example 1 and 10 parts of the pulp material made of meta-aromatic polyamide used in Example 1 were used, and the dry basis weight was changed. A wet paper paper having a dry basis weight of 100 g/m ² was obtained. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 1000 g/m ² . Two sheets of this wet paper having a dry basis weight of 1000 g/m ² were laminated to form a wet paper having a dry basis weight of 2000 g/m ² . This laminated wet paper was heat pressed using a 140° C. heat press machine at a pressure of 1.5 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 2000 g/m ² and a thickness of 5 mm. .

Comparative example 3
The method was the same as in Example 1, except that the glass fiber used in Example 1 was used as 90 parts, the pulp made of meta-aromatic polyamide used in Example 1 as 10 parts, and the dry basis weight was changed. A wet paper paper having a dry basis weight of 87.5 g/m ² was obtained. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 875 g/m ² . Two sheets of this wet paper with a dry basis weight of 875 g/m ² were laminated to form a wet paper with a dry basis weight of 1750 g/m ² . This laminated wet paper was heat-pressed using a 140° C. heat press machine at a pressure of 2.0 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 1750 g/m ² and a thickness of 5 mm. .

Comparative example 4
The same procedure as in Example 1 was prepared using 85 parts of the glass wool used in Example 1, 11 parts of the glass fiber used in Example 1, and 4 parts of the pulp-like material made of meta-aromatic polyamide used in Example 1. A wet paper paper with a dry basis weight of 50 g/m ² was obtained by this method. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 500 g/m ² . Ten sheets of this wet paper with a dry basis weight of 500 g/m ² were laminated to form a wet paper with a dry basis weight of 5000 g/m ² . This laminated wet paper was heat pressed at a pressure of 4.0 MPa using a heat press machine at 140°C, and the wet paper was dried to produce a glass wool board with a basis weight of 5000 g/m ² and a thickness of 10 mm. .

Comparative example 5
The dry basis weight was changed by using 53 parts of the glass wool used in Example 1, 30 parts of the glass fiber used in Example 1, and 17 parts of the pulp material made of meta-aromatic polyamide used in Example 1. Except for this, a wet paper paper having a dry basis weight of 40 g/m ² was obtained in the same manner as in Example 1. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 400 g/m ² . Ten sheets of this wet paper with a dry basis weight of 400 g/m ² were laminated to form a wet paper with a dry basis weight of 4000 g/m ² . This laminated wet paper was heat pressed using a 140° C. heat press machine at a pressure of 2.0 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 4000 g/m ² and a thickness of 10 mm. .

Comparative example 6
A wet paper paper having a dry basis weight of 38.5 g/m ² was obtained in the same manner as in Example 4 except that the dry basis weight was changed. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 385 g/m ² . This wet paper was heat pressed using a 140° C. heat press machine at a pressure of 5.0 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 385 g/m ² and a thickness of 0.7 mm. .

Comparative example 7
A wet paper paper having a dry basis weight of 94.5 g/m ² was obtained in the same manner as in Example 3 except that the dry basis weight was changed. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 945 g/m ² . Ten sheets of this wet paper having a dry basis weight of 945 g/m ² were laminated to form a wet paper having a dry basis weight of 9450 g/m ² . This laminated wet paper was heat pressed using a 140° C. heat press machine at a pressure of 1.5 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 9450 g/m ² and a thickness of 26 mm. .

Comparative example 8
A wet paper paper having a dry basis weight of 70.0 g/m ² was obtained in the same manner as in Example 1 except that the dry basis weight was changed. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 700 g/m ² . Two sheets of this wet paper having a dry basis weight of 700 g/m ² were laminated to form a wet paper having a dry basis weight of 1400 g/m ² . This laminated wet paper was heat-pressed at a pressure of 1.0 MPa using a heat press machine at 140° C., and the wet paper was dried to produce a glass wool board having a basis weight of 1400 g/m ² and a thickness of 5 mm.

Comparative example 9
A wet paper paper having a dry basis weight of 57.0 g/m ² was obtained in the same manner as in Example 1 except that the dry basis weight was changed. After wrapping this around a cylindrical drum 10 times, it was cut in the width direction of the cylindrical drum to obtain a wet paper with a dry basis weight of 570 g/m ² . Ten sheets of this wet paper with a dry basis weight of 570 g/m ² were laminated to form a wet paper with a dry basis weight of 5700 g/m ² . This laminated wet paper was heat-pressed using a 140° C. heat press machine at a pressure of 5.5 MPa, and the wet paper was dried to produce a glass wool board with a basis weight of 5700 g/m ² and a thickness of 10 mm.

The following physical properties were measured and evaluated for the glass wool boards of Examples and Comparative Examples, and the results are shown in Tables 1 and 2.

<Basic weight of glass wool board>
The basis weight of the glass wool board was measured in accordance with JIS P8124:2011.

<Thickness of glass wool board>
The thickness of the glass wool board was determined by measuring the thickness of the four corners using an M-type standard caliper manufactured by Mitutoyo, and taking the average value.

<Handling>
To evaluate the handling properties of the glass wool board, four pieces were cut into 36-sized pieces measuring 910 mm in the width direction x 1820 mm in the machine direction, and evaluated using the following evaluation criteria. For each item, if even one item was applicable, it was used as the evaluation standard.

○: Feels lightweight and can be lifted by one person. The board will not bend when lifted. There is no fuzz on the surface of the board, and there is no tingling sensation when you touch the board surface. No damage or poor cuts to the edges.

△: Feels lightweight and can be lifted by one person. The board may flex when lifted. There is some fluff on the surface of the board, and it feels a little prickly when you touch the surface of the board. Edges may be damaged or poorly cut.

×: Feels heavy and difficult to lift by one person. The board may bend when lifted. There is fluff on the surface of the board, and it feels prickly when you touch the surface of the board. Damage or poor cuts are visible on the edges.

<Insulation>
To evaluate the thermal insulation properties of glass wool boards, we cut out three test pieces of 100 mm in the width direction x 100 mm in the machine direction from each board, and placed each test piece on a hot plate (product name: Ultra High Temperature Hot Plate PA8010-) set at 600°C. CC, manufactured by MSA Factory, plate area: 100 mm x 100 mm), and the surface temperature of the upper surface of the board not in contact with the hot plate was measured after 20 minutes.

<Fire resistance>
To evaluate the fire resistance of glass wool boards, three test pieces with a size of 100 mm in the width direction x 100 mm in the machine direction were cut out from each sheet, and a burner (product name: Labo Burner APTL, manufactured by Phoenix Dent Co., Ltd.) was placed in the center of each test piece. ) flame was irradiated for 20 minutes. Thereafter, the board surface on the side to which the flame was applied was visually observed and evaluated using the following evaluation criteria. The flame temperature of the burner was 1000°C.

○: There are no holes, cracks, or melting in the board.
△: Slight melting and dents are observed on the surface of the board exposed to flame.
×: There are holes or cracks in the board.

<Nonflammability>
To evaluate the nonflammability of glass wool boards, one test piece with a size of 100 mm in the width direction x 100 mm in the flow direction was cut out from each sheet and tested according to Article 2, Item 9 of the Building Standards Act and Article 108-2 of the Building Standards Act Enforcement Order. We conducted a heat generation test using a cone calorimeter tester in accordance with the fireproofing test method and performance evaluation standards based on the above, to confirm whether it met the standards for noncombustible materials. The standards for noncombustible materials are that the total calorific value for 20 minutes after the start of heating is 8 MJ/ ^m2 or less, the maximum heat generation rate for 20 minutes after the start of heating does not exceed 200kW/ ^m2 for 10 seconds or more, and For 20 minutes after starting, no cracks or holes penetrating the back surface, which are harmful in terms of fire protection, should occur. In the table, the maximum heat generation rate did not exceed 200kW/ ^m2 for 20 minutes after the start of heating for any of the test pieces for 10 seconds or more, so the total heat generation amount and the presence or absence of damage and deformation are shown.

As shown in Table 1, the glass wool boards produced in Examples 1 to 6 contained pulp-like materials made of glass wool, glass fibers, and meta-aromatic polyamide; The content is 5% by mass or more and 15% by mass or less. Further, the density of the glass wool board is 0.30 g/cm ³ or more and 0.55 g/cm ³ or less, and the thickness is 1 mm or more and 25 mm or less. Further, the glass wool content is 45% by mass or more and 85% by mass or less, and the glass fiber content is 10% by mass or more and 40% by mass or less. The glass wool boards produced in Examples 1 to 6 were excellent in all evaluations of handling properties, heat insulation properties, fire resistance, and nonflammability. Regarding heat insulation properties, it was confirmed that the thicker the material, the better the heat insulation properties.

The glass wool board produced in Example 7 has a glass fiber content of less than 10% by mass. In the nonflammable cone calorimeter test, no cracks, holes, or damage that penetrated to the back surface were observed, but shrinkage deformation due to heat was observed.

The glass wool board produced in Example 8 has a glass fiber content of more than 40% by mass. When I touched the edges and surface of the glass wool board, I felt a slight prickling sensation, and the cut surfaces of the edges were slightly jagged, resulting in slightly poor handling. Furthermore, when compared with Example 2, Example 8 had slightly inferior heat insulation properties.

The glass wool board produced in Example 9 has a glass wool content of 45% by mass and a glass fiber content of more than 50% by mass. When I touched the edges and surface of the glass wool board, I felt a slight prickling sensation, and the cut surfaces of the edges were slightly jagged, resulting in slightly poor handling. Moreover, when compared with Example 1, Example 9, which had a lower glass wool content, had slightly inferior heat insulation properties.

The glass wool board produced in Example 10 has a glass wool content of more than 85% by mass and a glass fiber content of less than 10% by mass. In the nonflammable cone calorimeter test, no cracks, holes, or damage that penetrated to the back surface were observed, but shrinkage deformation due to heat was observed, fuzzing was observed on the surface of the glass wool board, and the surface and edges of the glass wool board were not touched. There was a slight tingling sensation when the vehicle was pressed, resulting in slightly poor handling performance.

The glass wool board produced in Comparative Example 1 does not contain a pulp-like material made of meta-aromatic polyamide. It was lightweight and had excellent nonflammability. However, when irradiated with burner flame, the surface melted and holes gradually developed, resulting in poor fire resistance. Moreover, when compared with Example 6, the heat insulation properties were inferior.

The glass wool board produced in Comparative Example 2 does not contain glass fiber. In the hot press process, delamination was likely to occur, resulting in poor handling properties. In addition, in the burner test, dents due to melting were observed on the board surface, and in the nonflammable cone calorimeter test, no cracks, holes, or damage that penetrated to the back surface were observed, but deformation due to heat was observed.

The glass wool board produced in Comparative Example 3 does not contain glass wool. When I touched the edges and surface of the board, I felt a tingling sensation, and the cut surfaces of the edges were jagged, resulting in poor handling. Moreover, when compared with Example 1, the density tended to be low, resulting in poor heat insulation and fire resistance.

The glass wool board produced in Comparative Example 4 contained less than 5% by mass of pulp-like material made of meta-aromatic polyamide. The interlayer strength was weak and delamination occurred. Furthermore, many glass wool and glass fibers fell off the board surface, resulting in significantly poor handling properties.

In the glass wool board produced in Comparative Example 5, the content of pulp-like material made of meta-aromatic polyamide exceeds 15% by mass. Although there were no problems with handling, heat insulation, and fire resistance, the total calorific value exceeded 8 MJ/m ² and it was found that nonflammability could not be achieved.

The glass wool board produced in Comparative Example 6 has a thickness of less than 1 mm. When trying to lift the board, the board bent, the strength of the board was weak, the edges were prone to cracking, and the handling was poor.

The glass wool board produced in Comparative Example 7 has a thickness exceeding 25 mm. The weight of the 36-size paper was 15.7 kg, which gave it a heavy feel, requiring two people to transport it, resulting in poor handling.

The glass wool board produced in Comparative Example 8 has a density of less than 0.30 g/cm ³ . The interlayer strength was weak and delamination occurred. Furthermore, many glass wool and glass fibers fell off the board surface, resulting in significantly poor handling properties.

The glass wool board produced in Comparative Example 9 has a density of more than 0.55 g/cm ³ . Although there were no problems with handling, heat insulation, and fire resistance, the total calorific value exceeded 8 MJ/m ² and it was found that nonflammability could not be achieved.

The glass wool board of the present invention can be suitably used in the fields of construction materials; transportation means such as automobiles, ships, and aircraft; and electrical appliances such as refrigerators and freezers.

Claims (3)

Contains a pulp-like material made of glass wool, glass fiber, and a meta-aromatic polyamide, and the content of the pulp-like material made of the meta-aromatic polyamide is 5% by mass or more and 15% by mass or less based on the total fiber component. A glass wool board having a density of 0.30 g/cm ³ or more and 0.55 g/cm ³ or less, and a thickness of 1 mm or more and 25 mm or less. The glass wool board according to claim 1, wherein the glass wool content is 45% by mass or more and 85% by mass or less, and the glass fiber content is 10% by mass or more and 40% by mass or less, based on the total fiber components. In the method for producing a glass wool board according to any one of claims 1 to 2, wet paper is produced by a wet papermaking method from a slurry in which a pulp-like material consisting of glass wool, glass fiber, and meta-based aromatic polyamide is mixed. 1. A method for manufacturing a glass wool board, comprising the steps of: manufacturing a plurality of sheets of wet paper; laminating a plurality of sheets of laminated wet paper; and heat-pressing the laminated wet paper to integrate them.