JP2022071377A - Fireproof sheet for backing wallpaper - Google Patents

Abstract

To provide a fireproof sheet for backing wallpaper which is excellent in the coating property of an inorganic particle layer, excellent in the flatness of a polyvinyl chloride resin coated surface, furthermore has both flexibility, fire resistance and noncombustibility, and hardly causes the fall of the inorganic particle layer.SOLUTION: A fireproof sheet for backing wallpaper comprises a base material and an inorganic particle layer, the base material contains a pulp-like material composed of glass fiber, a wet heat adhesive binder fiber and a para-aromatic polyamide, the content of the pulp-like material composed of the para-aromatic polyamide is 2.0 mass% or more and 12.5 mass% or less based on the glass fiber, and the inorganic particle layer contains inorganic particles and an inorganic binder.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fireproof sheet for wallpaper lining for interiors used in houses and the like, and is suitably used for a fireproof sheet for wallpaper lining coated with a foamed polyvinyl chloride resin (foamed vinyl chloride resin).

Buildings subject to fire prevention are stipulated by the Building Standard Law and the Enforcement Ordinance of the Law. For properties that are subject to interior restrictions such as walls and ceilings when newly built or renewed, mainly in commercial facilities, office buildings, medical and welfare facilities, etc. that fall under this category, wall covering materials with fireproof performance certified as non-combustible materials are used. Required to use. Therefore, some wall covering materials having flameproof property, heat resistance, nonflammability and the like have been proposed. However, a wallpaper lining sheet that satisfies the performance such as flame resistance, heat resistance, and nonflammability, has a good flatness on the surface coated with polyvinyl chloride resin, and has flexibility that is easy to install has still been found. The current situation is that it has not.

For example, as the sheet material, in Patent Document 1, an inorganic filler and an organic material are used in the gaps between the fiber base sheet, which is 20 to 100% glass fiber and 80 to 0% pulp and / or other organic fibers. A sheet material to which a synthetic resin is mixed and applied (supplied) is disclosed. As described above, when the inorganic filler is used, the fiber base sheet is required to have excellent coatability when the inorganic filler is applied. Further, the sheet material is required to be less likely to cause a phenomenon called "powder drop" in which the inorganic filler is dropped off. Since the sheet material of Patent Document 1 uses organic fibers, its nonflammability is insufficient, and when organic fibers are not used, the sheet strength is weak, it is difficult to apply an inorganic filler, and the coatability is high. There is a problem that it is low. Further, since an organic synthetic resin is used as a binder for the inorganic filler, there is a problem that nonflammability and heat resistance are lowered. Furthermore, the flatness of the surface coated with the polyvinyl chloride resin was also insufficient.

Further, as a glossy flame-retardant paper, Patent Document 2 discloses a sheet-like material obtained by impregnating a paper-like material of inorganic fibers with a flame-retardant paint containing an inorganic powder that generates a flame-retardant gas as a main component. Has been done. Since this flame-retardant paper uses an organic binder for the flame-retardant paint, it is not sufficiently nonflammable, and release paper is used for coating inorganic powder, resulting in poor productivity and high cost. Furthermore, there was a problem that the sheet for wallpaper lining lacked flexibility.

Further, Patent Document 3 discloses that a resin composition containing latex is applied to at least the surface of a glass fiber mixed paper made of glass fiber, wood pulp, and binder fiber. Since this glass fiber mixed paper is coated with a resin composition such as wood pulp or latex, it has low nonflammability and low fire resistance. Further, although the smoothness of the surface of the foamed polyvinyl chloride resin was sufficient for the cushion floor material, it was insufficient for the wallpaper lining.

Jitsukosho 61-21240 Gazette Jitsukaisho 62-114100 Gazette Japanese Unexamined Patent Publication No. 10-046485

The subject of the present invention is excellent coatability of the inorganic particle layer, good flatness of the surface coated with polyvinyl chloride resin, flexibility, fire resistance and nonflammability, and fire resistance for wallpaper lining with less powder falling off. To provide a sheet.

As a result of diligent research to solve the above problems, the following inventions were found.

(1) A pulp containing a base material and an inorganic particle layer, the base material containing a pulp-like material composed of glass fiber, a moist heat-adhesive binder fiber, and a para-aromatic polyamide, and a pulp made of the para-aromatic polyamide. For wallpaper lining, the content of the state material is 2.0% by mass or more and 12.5% by mass or less with respect to the glass fiber, and the inorganic particle layer contains inorganic particles and an inorganic binder. Fireproof sheet.

(2) The fireproof sheet for wallpaper lining according to (1) above, wherein the moist heat-adhesive binder fiber is silanol-modified polyvinyl alcohol fiber.

The fireproof sheet for wallpaper lining of the present invention uses a base material containing a pulp-like material composed of glass fiber, moist heat-adhesive binder fiber, and para-aromatic polyamide. A pulp-like material made of para-aromatic polyamide enters the voids between the glass fibers, and in order to hold the glass fibers together, a coating liquid for forming an inorganic particle layer is applied to the base material, and the coating liquid temperature is moist and heat-bonded during drying. Even when the melting temperature of the sex binder fiber is reached, the heat-resistant water property is excellent, and the operation stability when the coating liquid for forming the inorganic particle layer is applied to the base material is excellent. Furthermore, by containing a pulp-like material composed of a moist heat-adhesive binder fiber and a para-aromatic polyamide, the smoothness of the fireproof sheet for wallpaper lining is improved, so that the surface of the polyvinyl chloride resin coating surface is well flat. Therefore, there is little powder falling off, and flexibility that is easy to install can be ensured.

Further, the refractory sheet for wallpaper lining of the present invention contains an inorganic particle layer containing inorganic particles and an inorganic binder, and a pulp-like material made of para-aromatic polyamide having high heat resistance and hydrophilicity is used as a base material. Since it is contained, the coating liquid for forming an inorganic particle layer has excellent liquid retention, so that the content of inorganic particles can be increased, and the effects of excellent fire resistance and nonflammability can be achieved.

It is a surface observation image of the base material of the fireproof sheet for wallpaper lining.

In the present invention, the fireproof sheet for wallpaper lining contains a base material and an inorganic particle layer, and the base material contains a pulp-like material composed of glass fiber, moist heat-adhesive binder fiber, and para-aromatic polyamide. The content of the pulp-like material made of para-aromatic polyamide is 2.0% by mass or more and 12.5% by mass or less with respect to the glass fiber, and the inorganic particle layer contains inorganic particles and an inorganic binder. It is characterized by that.

In this specification, it may be abbreviated as follows.
Refractory sheet for wallpaper lining: Refractory sheet Pulp-like material made of para-aromatic polyamide: Para-aromatic polyamide Level difference in pulp core Sk: Sk

Examples of the glass fiber in the present invention include chopped strands, glass wool, and glass flakes. Any glass fiber may be used as long as it is hard to break and has the ability to form a base material. The fiber diameter of the glass fiber is preferably 1 to 11 μm, more preferably 2 to 8 μm, and even more preferably 3 to 7 μm. If the fiber diameter is less than 1 μm, the glass fiber may fall off from the base material during papermaking because it is too fine, and the strength and thickness of the base material may be insufficient. When the fiber diameter exceeds 11 μm, the glass fiber becomes too thick and the gap between the base materials becomes large, and even if an inorganic particle layer is formed, the flatness of the surface coated with the polyvinyl chloride resin is impaired or inorganic. Particles may drop more or the flexibility may worsen. When the fiber diameter of the glass fiber is 1 to 11 μm, the gaps between the base materials are fine and uniform, so that there is little powder falling off after forming the inorganic particle layer, and the surface coated with the polyvinyl chloride resin tends to be flat. Furthermore, it becomes a fireproof sheet with excellent flexibility.

Further, the fiber length of the glass fiber in the present invention is preferably 1 to 15 mm, more preferably 2 to 10 mm, still more preferably 3 to 6 mm. If the fiber length is less than 1 mm, the strength of the base material may be insufficient, and if the fiber length exceeds 15 mm, the texture of the base material may be deteriorated or the flexibility may be deteriorated.

The content of the glass fiber is preferably 75 to 93% by mass, more preferably 80 to 90% by mass, and even more preferably 83 to 87% by mass with respect to the fiber component. If the content is less than 75% by mass, the fire resistance or nonflammability may deteriorate. Further, when the content exceeds 93% by mass, the bond between the glass fibers is weak, so that the strength of the base material is weakened, the coatability of the inorganic particle layer may be deteriorated, and further, the fibers of the base material may be deteriorated. Since the gap becomes large, the flatness of the surface coated with the polyvinyl chloride resin may be impaired.

The binder fiber used in the present invention is a wet heat adhesive binder fiber. The moist heat-adhesive binder fiber refers to a fiber that flows from the fiber state at a certain temperature or is easily deformed to exhibit an adhesive function in a wet state. Specifically, it is a thermoplastic fiber that can be softened with hot water (for example, about 80 to 120 ° C.) and self-adhesive or adheres to other fibers. For example, a polyvinyl-based fiber (polyvinylpyrrolidone, polyvinyl ether, polyvinyl). Alcohol, polyvinyl acetal, etc.), Cellulosic fibers (C1-3 alkyl cellulose such as methyl cellulose, hydroxy C1-3 alkyl cellulose such as hydroxymethyl cellulose, carboxy C1-3 alkyl cellulose such as carboxymethyl cellulose, or salts thereof), modified vinyl Fibers made of a system copolymer (a copolymer of a vinyl monomer such as isobutylene, styrene, ethylene, vinyl ether and an unsaturated carboxylic acid such as maleic anhydride, or an anhydride thereof, or a salt thereof, etc.) And so on. As the wet-heat adhesive binder fiber used in the present invention, polyvinyl-based fiber is preferable, and polyvinyl alcohol (PVA) fiber is more preferable. When polyvinyl alcohol fibers are used, the strength of the base material becomes higher, a film is easily formed between the fibers, and inorganic particles are easily held between the fibers. In addition, the smoothness of the base material is likely to be improved.

The moist heat-adhesive binder fiber used in the present invention includes a modified polyvinyl alcohol fiber modified with a compound having a crosslinkable functional group, and a crosslinked polyvinyl alcohol obtained by cross-linking with a cross-linking agent under mild conditions during or after spinning. The fiber makes it possible to impart heat-resistant water properties to the low-drawn yarn, which is more preferable.

Examples of the crosslinkable functional group include a silanol group, a carboxyl group, a methylol group and the like. By adjusting the pH and the like, polyvinyl alcohol modified with a compound having a crosslinkable functional group can be dissolved in water without cross-linking and spun to obtain modified polyvinyl alcohol fiber. The modified polyvinyl alcohol fiber may be crosslinked during or after spinning. The degree of denaturation is preferably 0.01 to 10 mol%, more preferably 0.1 to 5 mol%. As a suitable example, silanol-modified polyvinyl alcohol (modification degree 0.1 to 2 mol%) is dissolved in an alkaline solution (pH 9 to 13), and the solution is acidified (pH 5 to 6) to be cross-linked and spun. Examples thereof include silanol-modified polyvinyl alcohol fibers obtained by heat treatment after drying.

Further, crosslinked polyvinyl alcohol fibers obtained by a method of spinning unmodified polyvinyl alcohol having no self-crosslinking property and then applying various organic or inorganic crosslinking agents to crosslink the fibers can also be used. Examples of the inorganic cross-linking agent include phosphoric acid, ammonium phosphate, ammonium sulfate, titanyl sulfate and the like. In addition, examples of the organic cross-linking agent include methylol-based, epoxy-based, isocyanate-based, and aldehyde-based cross-linking agents. Cross-linking can be promoted by adding these cross-linking agents to the unmodified polyvinyl alcohol spinning stock solution and spinning, or by spinning the unmodified polyvinyl alcohol alone and passing it through a cross-linking agent-containing bath, and then heat-treating. can. It is also possible to use these methods together.

The moist heat-adhesive binder fiber used in the present invention is not limited to the above, but the silanol-modified polyvinyl alcohol fiber has higher adhesiveness to the glass fiber, so that the tensile strength of the base material can be further increased. , Especially preferable.

The fineness of the wet-heat adhesive binder fiber is preferably 0.1 to 5.6 decitex, more preferably 0.4 to 2.2 decitex, and preferably 0.6 to 1.1 decitex. More preferred. If the fineness is less than 0.1 decitex, the fiber itself becomes very expensive and the substrate may be too dense and thin. On the other hand, when it exceeds 5.6 decitex, the number of contacts with the glass fiber is reduced, and it may be difficult to maintain the strength in a wet state. In addition, it may not be possible to obtain a uniform texture. The fiber length of the moist heat-adhesive binder fiber is preferably 1 to 15 mm, more preferably 2 to 10 mm, still more preferably 3 to 5 mm. If the fiber length is less than 1 mm, the moist heat-adhesive binder fiber may come off from the papermaking wire during papermaking, and a fireproof sheet having sufficient strength may not be obtained. On the other hand, if it exceeds 15 mm, the moist heat-adhesive binder fiber may be entangled when dispersed in water, and the texture of the refractory sheet may become uneven.

The content of the moist heat-adhesive binder fiber is preferably 3 to 20% by mass, more preferably 4 to 15% by mass, and further preferably 5 to 10% by mass with respect to the glass fiber. .. If the amount of the wet-heat adhesive binder fiber is less than 3% by mass, the strength of the base material is lowered, and the paper may be cut off when the inorganic particle layer is applied, or the glass fiber may fall off. On the other hand, when the content of the moist heat-adhesive binder fiber exceeds 20% by mass, the releasability from the dryer may deteriorate when the base material is made by the wet papermaking method, and the inorganic particle layer is coated. When doing so, the permeability to the base material may decrease, and the fire resistance of the fireproof sheet for wallpaper lining may deteriorate.

Examples of the pulp-like material made of para-aromatic polyamide used in the present invention include pulp-like materials made of poly (p-phenylene isophthalamide) and poly (p-phenylene terephthalamide).

Further, the pulp-like material made of para-aromatic polyamide used in the present invention is a thin leaf-like or scaly material having a large number of minute fibrils that can be used to make a paper-like structure using a paper machine. It is a small piece and refers to a fiber having high strength and excellent heat resistance by forming a crystal structure by firmly binding molecular chains to each other in the fiber. FIG. 1 is an electron micrograph of the base material of a fire-resistant glass fiber sheet containing a pulp-like material made of a para-aromatic polyamide, and the fibril portion of the pulp-like material can be observed.

As the pulp-like product made of the para-aromatic polyamide described above, the product obtained by introducing a fiber-forming polymer polymer solution into an aqueous coagulation bath is recovered without drying and beaten as necessary. Etc. can be obtained. For example, a fibrid produced by mixing a polymer polymer solution with the precipitant in a system in which shearing force exists, or a crystalline material having molecular orientation formed from a polymer polymer solution exhibiting optical anisotropy. It is a formation, and is manufactured by the production method described in, for example, Japanese Patent Publication No. 35-11851, Japanese Patent Publication No. 37-5732, and the like. Beating processing can be performed as needed.

The beating process includes a refiner, beater, mill, grinder, a rotary homogenizer that applies shear force by a high-speed rotary blade, and a shear force generated between the inner blade and fixed outer blade of a high-speed rotating cylinder. A double-cylindrical high-speed homogenizer, an ultrasonic crusher that is atomized by the impact of ultrasonic waves, and a fiber suspension that is given a pressure difference to pass through a small-diameter orifice to achieve high speed, and the fibers are made to collide with each other. Treatment using a high-pressure homogenizer or the like that applies shearing force and cutting force to the surface can be mentioned.

In the present invention, the pulp-like material made of para-aromatic polyamide shrinks significantly when the water existing between the crystal structures is removed by heating or depressurizing, and the heat-resistant water of the base material is used to strengthen the fiber network. It has the effect of improving the characteristics.

The length-weighted average fiber length of the pulp-like material made of para-aromatic polyamide is preferably 0.05 mm or more and 3.00 mm or less. If the length-weighted average fiber length is shorter than the preferred range, pulpy material may fall off from the substrate. If the length-weighted average fiber length is longer than the preferable range, entanglement or poor dispersion of the pulp-like material may occur.

When the pulp-like material made of para-aromatic polyamide has the above-mentioned length-weighted average fiber length, even if the content of the pulp-like material contained in the substrate is small, it is between the pulp-like materials or between the pulp-like material and glass. A dense network structure is formed between the fibers and the fibers, and it is easy to obtain a base material having high tensile strength, and it is easy to obtain a base material having high permeability and liquid retention of the coating liquid for forming an inorganic particle layer. Become. Further, when the coating liquid for forming the inorganic particle layer is applied and dried, the coating liquid temperature rises, and it is possible to prevent the strength of the base material from decreasing when the melting temperature of the moist heat-adhesive binder fiber is reached. ..

The average fiber width of the pulp-like material made of para-aromatic polyamide is preferably 5.0 μm or more and 100.0 μm or less, more preferably 8.0 μm or more and 80.0 μm or less, and further preferably 8.0 μm or more and 60.0 μm or less. .. When the average fiber width exceeds 100.0 μm, the network between the fibers may be lowered, the tensile strength of the base material may be lowered, or the inorganic particles may be difficult to penetrate. On the other hand, when the average fiber width is less than 5.0 μm, the processing time for beating the pulp-like material becomes long, and the productivity is significantly lowered.

In the present invention, the length-weighted average fiber length and average fiber width of a pulp-like material made of para-aromatic polyamide are length-weighted as measured in a projected fiber length mode using FQA-36 (OpTest Equipment). Average fiber length (L (w)) and fiber width.

In the present invention, the content of the pulp-like material made of para-aromatic polyamide with respect to the glass fiber is 2.0% by mass or more and 12.5% by mass or less, and 3.0% by mass or more and 10.0% by mass. It is more preferably 3.0% by mass or more and 8.0% by mass or less, and particularly preferably 3.0% by mass or more and 6.0% by mass or less. When the content of the pulp-like material made of para-aromatic polyamide exceeds 12.5% by mass, the base material becomes dense and the voids of the base material decrease too much, so that the coating liquid for forming the inorganic particle layer Permeability and liquid retention are deteriorated. Further, the inorganic particle layer is likely to be formed on the surface of the base material, and the flatness of the surface coated with the polyvinyl chloride resin is improved, but the flexibility of the refractory sheet is impaired and the falling off of the inorganic particles is increased. Further, since the pulp-like material enters too much between the glass fibers, the intersections between the glass fibers are reduced, and the tensile strength of the base material is lowered. On the other hand, when the content of the pulp-like material made of para-aromatic polyamide is less than 2.0% by mass, a dense network structure between the pulp-like materials made of para-aromatic polyamide or between the pulp-like material and the glass fiber. Is difficult to form, and the effect of improving tensile strength is not exhibited. Further, since the voids of the base material increase, the polyvinyl chloride resin easily enters the inside of the base material, and the flatness of the surface coated with the polyvinyl chloride resin deteriorates.

In the present invention, the modified drainage degree of the pulp-like product made of para-aromatic polyamide is preferably 0 to 300 mL, more preferably 0 to 200 mL, still more preferably 0 to 100 mL. When the modified drainage degree exceeds 300 mL, the fiber width of the pulp-like material is wide and the fibrillation is not so advanced, so that the dense network with the glass fiber is reduced, and the tensile strength may decrease. .. On the other hand, when the modified drainage degree is less than 0 mL, the fine content of the pulp-like material made of para-aromatic polyamide increases, the rate of dropping from the substrate increases, and the yield may decrease. In addition, the fibrilization process of the fiber takes time and becomes very expensive. Further, since the base material tends to be thin and has a high density, it may be difficult for the coating liquid for forming the inorganic particle layer to permeate into the inside, and the fire resistance may be deteriorated. As the pulp-like material made of para-aromatic polyamide progresses to fibrilization, the modified drainage level continues to decrease. Then, even after the modified drainage reaches 0 mL, when further fibrillation occurs, the fibers pass through the mesh and the modified drainage begins to increase. In the present invention, the state in which the modified drainage degree begins to increase in the reverse direction is referred to as "the modified drainage degree is less than 0 mL".

In the present invention, the modified drainage degree uses an 80-mesh wire mesh having a wire diameter of 0.14 mm and a mesh size of 0.18 mm as a sieving plate, the sample concentration is 0.1%, and other conditions are JIS P8121-. It is a value measured according to 2:2012.

In the present invention, in addition to the pulp-like material composed of glass fiber, moist heat-adhesive binder fiber, and para-aromatic polyamide, various fibers can be blended, if necessary, as long as the performance is not impaired. As a result, it is possible to increase the number of finer voids, and it may be possible to improve the retention of inorganic particles and the strength of the fireproof sheet for wallpaper lining. Examples of such fibers include recycled fibers such as rayon, cupra, and lyocell fibers, semi-synthetic fibers such as acetate, triacetate, and promix, polyolefin-based, polyamide-based, polyacrylic-based, vinylon-based, vinylidene, polyvinyl chloride, and polyester. Inorganic fiber such as synthetic resin fiber such as system, benzoate, polyclar, phenol, melamine, furan, urea, aniline, unsaturated polyester, fluorine, silicone, and derivatives thereof, metal fiber, carbon fiber, alumina, silica, ceramics, rock fiber, etc. Examples include fibers.

The synthetic resin fiber may be a fiber made of a single resin (single fiber) or a composite fiber made of two or more kinds of resins. Examples of the composite fiber include a core sheath type, an eccentric type, a side-by-side type, a sea island type, an orange type, and a multiple bimetal type. Further, the various fibers that can be included in the fireproof sheet for wallpaper lining of the present invention may be used alone or in combination of two or more.

In the present invention, the thickness of the base material is preferably 0.1 mm or more, more preferably 0.2 mm or more, and further preferably 0.3 mm or more. Further, it is preferably 1.0 mm or less, more preferably 0.8 mm or less, and further preferably 0.6 mm or less. When the thickness of the base material is within the above range, the base material in the present invention can maintain the tensile strength required in the papermaking process and the coating process, so that the workability in each process including the papermaking property of the base material can be maintained. Will be good. If the thickness of the base material exceeds 1.0 mm, the flexibility of the refractory sheet for wallpaper lining may be impaired and it may be difficult to handle. If the thickness of the base material is less than 0.1 mm, the thickness of the base material tends to be uneven and difficult to apply, and it is necessary to apply a large amount of the inorganic particle layer, which may cause more dropout. Flexibility may be reduced.

The density of the base material in the present invention is preferably 0.07 g / cm ³ or more, and more preferably 0.10 g / cm ³ or more. Further, it is preferably 0.50 g / cm ³ or less, and more preferably 0.30 g / cm ³ or less. If the density is less than 0.07 g / cm ³ , the tensile strength of the base material becomes too weak and there is a risk of damage during handling or coating of the base material, and if it exceeds 0.50 g / cm ³ , The flexibility of the base material may deteriorate, making it difficult to wind up with a reeler in the papermaking process, or the amount of coating of the inorganic particle layer may decrease.

The substrate in the present invention is preferably a wet nonwoven fabric produced by a wet papermaking method (papermaking method). In the wet papermaking method, fibers are dispersed in water to form a uniform papermaking slurry, and the papermaking slurry is made with a papermaking machine to produce a wet non-woven fabric. Examples of the paper machine include a circular net paper machine, a long net paper machine, an inclined paper machine, an inclined short net paper machine, and a combination machine thereof. Further, it can be manufactured by a paper machine having a plurality of head boxes and stacking wet paper on a wire. In addition to the fiber raw material, 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 papermaking slurry. The solid content concentration of the papermaking slurry is preferably about 0.5 to 0.001% by mass. This papermaking slurry is further diluted to a predetermined concentration and then made into a papermaking web to obtain a wet paper web. Then, the papermaking web is squeezed with a press roll or the like to adjust the water content. Then, using a Yankee dryer, the moist heat-adhesive binder fibers are melted to develop strength and dried at the same time. By drying with a Yankee dryer, the dried surface becomes smooth, and a surface with less unevenness on the surface can be formed. In addition, as auxiliary drying, there is no problem even if a heating device such as a hot air dryer, a heating roll, or an infrared heater is used together. The drying temperature at this time is preferably a temperature at which the moisture of the wet paper web can be sufficiently removed and the strength can be developed by the wet heat adhesive binder fiber.

In the present invention, the inorganic particle layer is a layer containing inorganic particles and an inorganic binder. This inorganic particle layer covers most of the surface of the fiber contained in the base material, and is filled in the voids of the base material to obtain the effects of fire resistance and nonflammability of the refractory sheet. Be done. Further, the permeability of the polyvinyl chloride resin is suppressed, and the flatness of the coated surface is improved.

FIG. 1 is an electron microscope (SEM) observation photograph of a Yankee dryer surface in a base material of a fireproof sheet for wallpaper lining. Glass fibers contained in the base material, pulpy substances made of para-aromatic polyamides, and moist heat-adhesive binder fibers can be confirmed. Fibrous materials made of para-aromatic polyamide enter between the glass fibers, fill the gaps between the glass fibers, and improve the smoothness of the base material by the film of the moist heat-adhesive binder fiber.

Inorganic particles include aluminum hydroxide, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate plaster, tricalcium aluminate, clay, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, barium carbonate, talc, etc. Inorganic particles with good water dispersibility such as titanium dioxide can be used. The above-mentioned inorganic particles may be used alone or in combination of two or more.

Among the inorganic particles, aluminum hydroxide oxide, clay, kaolin, calcined kaolin, and carbonate-based inorganic particles are preferable because the inorganic particles solidify when exposed to a flame and can prevent powder from falling from the refractory sheet. Further, aluminum hydroxide oxide, clay, kaolin, and calcined kaolin are more preferable because they are excellent in fire resistance and nonflammability and can maintain the strength of the refractory sheet even when the refractory sheet is held at a high temperature.

In the present invention, the particle size of the inorganic particles is preferably 0.08 μm or more and 2.00 μm or less, more preferably 0.30 μm or more and 1.50 μm or less, and 0.40 μm or more and 1.00 μm or less. Is even more preferable. If the particle size exceeds 2.00 μm, the fire resistance of the wallpaper lining refractory sheet may deteriorate, or the heat insulating property when dropped or exposed to high temperature may deteriorate. On the other hand, when the particle size is less than 0.08 μm, the viscosity is easily increased when the inorganic particles are dispersed, which makes it difficult to disperse. It is necessary to increase the amount of the inorganic binder to prevent it from falling off, which may impair the flexibility of the refractory sheet. The particle diameter referred to in the present invention is a value obtained by converting the diameter of a perfect circle from the area of the inorganic particles obtained from the SEM photograph of the inorganic particles.

In the present invention, the inorganic particle layer contains an inorganic binder. Examples of the inorganic binder include sepiolite, colloidal silica, water glass, alumina sol, bentonite and the like. The above-mentioned inorganic binder may be used alone or in combination of two or more.

In the present invention, the content of the inorganic binder contained in the inorganic particle layer is preferably 2% by mass or more and 100% by mass or less, and 5% by mass or more and 50% by mass or less, based on the total amount of the inorganic particles. Is more preferable, and it is further preferable that it is 10% by mass or more and 30% by mass or less. When the content of the inorganic binder is less than 2% by mass, the inorganic particles may easily fall off from the base material. Further, when the content of the inorganic binder exceeds 100% by mass, the coatability of the inorganic particles may deteriorate.

The medium for preparing the coating liquid for forming the inorganic particle layer is not particularly limited as long as it can uniformly dissolve or disperse the inorganic binder and the inorganic particles. 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), dimethylacetamide, dimethylformamide, dimethyl sulfoxide, etc. Water or the like can be used as needed. The medium used is preferably a medium that does not expand the base material or a medium that does not dissolve the base material.

The content of the inorganic particle layer is a value calculated by "coating amount of the inorganic particle layer (g / m ² ) / substrate basis weight (g / m ² ) x 100", and is preferably 90% by mass or more. , 100% by mass or more is more preferable, and 130% by mass or more is further preferable. When the content of the inorganic particle layer is 90% by mass or more, even when the refractory sheet for wallpaper lining is exposed to flame, the refractory sheet is hardly melted or damaged. On the other hand, the content of the inorganic particle layer is preferably less than 160% by mass. The higher the content of the inorganic particle layer, the thicker the fireproof sheet, and the higher the fire resistance and nonflammability. However, when the content of the inorganic particle layer is 160% by mass or more, the refractory sheet may fall off or the refractory sheet. Flexibility may be impaired.

Various coating devices can be used as the device for coating the inorganic particles on the base material in order to form the inorganic particle layer. For example, impregnation of 2 roll size press, gate roll coater, gravure coater, die coater, lip coater, blade coater, curtain coater, air knife coater, rod coater, kiss touch coater, dip coater, etc., or various coaters by coating equipment. Can be used, but is not limited to this.

In the present invention, in addition to the inorganic particles and the inorganic binder, the inorganic particle layer contains various dispersants such as polyacrylic acid and sodium carboxymethyl cellulose, and hydroxyethyl cellulose and sodium carboxymethyl cellulose in order to increase the liquid stability of the coating liquid. , Various thickeners such as polyethylene oxide, various water-retaining agents, various wetting agents, preservatives, defoaming agents and the like can be added as needed. Generally, a non-aqueous coating liquid using an organic solvent as a medium has a low surface tension, and a water-based coating liquid using water as a medium has a high surface tension. Since the substrate of the present invention has high acceptability of the coating liquid, both the non-water-based coating liquid and the water-based coating liquid can be coated without any problem, but in the present invention, only water is used as the medium. It is preferable to use the water-based coating liquid used.

In the present invention, the level difference Sk of the core portion obtained by measuring the surface roughness of at least one surface of the wallpaper lining refractory sheet with a confocal laser scanning microscope is preferably 55 μm or less, and preferably 50 μm or less. It is more preferably 45 μm or less, and even more preferably 45 μm or less. Further, Sk is preferably 20 μm or more, more preferably 25 μm or more, and further preferably 30 μm or more. The polyvinyl chloride resin is preferably applied to the surface having Sk of 55 μm or less. In the coating of polyvinyl chloride resin, foamed polyvinyl chloride resin is applied, dried and gelled, and then foamed. When the Sk of at least one side of the fireproof sheet for wallpaper lining of the present invention is 55 μm or less, the flatness of the surface coated with the polyvinyl chloride resin is good. Further, the inorganic particle layer has less powder falling off, and it becomes easy to obtain a fireproof sheet for wallpaper lining having flexibility, fire resistance and nonflammability. If Sk exceeds 55 μm, the flatness of the surface coated with the polyvinyl chloride resin may deteriorate. On the other hand, when Sk is less than 20 μm, the flatness of the surface coated with the polyvinyl chloride resin is good, and the fire resistance and nonflammability are also good, but the flexibility as a fireproof sheet for wallpaper lining may be impaired.

In the present specification, "the level difference Sk of the core portion" is an index for comparing the surface roughness, and is the difference between the upper level and the lower level of the core portion according to ISO25178. The larger the level difference Sk in the core portion, the larger the unevenness.

The Sk measurement method will be described.
(1) Taking a picture of the fireproof sheet for wallpaper lining The fireproof sheet for wallpaper lining is cut into a width of 45 mm and a length of 60 mm and used as a sample. A photograph of the fireproof sheet for lining the cut wallpaper is observed using a confocal laser scanning microscope (manufactured by KEYENCE, trade name: shape analysis laser scanning microscope VK-X1050) under the following conditions.

In "Simple measurement" of "Shape measurement" of "VK observation application", illuminate the fireproof sheet for wallpaper lining with coaxial lighting and observe at a shooting magnification of 20 times. Perform "Navigation image creation", select "Start point and length" as "Designation method of connection area" of "Connected measurement", specify the shooting size as "Horizontal: 3000 μm x Vertical: 2000 μm", and set the photo shooting position. Make a decision and start the measurement.

(2) Image correction Open the obtained photo of the fireproof sheet for wallpaper lining with the "multi-file analysis application" and perform image correction processing in the following order.

Surface shape correction: Select "waviness removal" as the correction method and "correction strength" as the specification method, and set the correction strength to "5" to perform surface shape correction.

(3) Surface roughness measurement Specify "whole area" as the measurement area and measure Sk. For one fireproof sheet for wallpaper lining, this measurement is performed at 5 points, and the average value of Sk at 5 points is calculated.

Table 1 shows the detailed setting conditions for surface roughness measurement.

As a method of reducing the Sk of the fireproof sheet for wallpaper lining to 55 μm or less,
(I) Use glass fiber with a small fiber diameter.
(II) Increase the amount of moist heat-adhesive binder fiber.
(III) Increase the amount of pulp-like material made of para-aromatic polyamide.
(IV) Increase the amount of coating of the inorganic particle layer.
(V) The inorganic particle layer is coated by a surface coating method such as a gravure coater or a rod coater.
And so on.

The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the examples, the percentages (%) and parts are all based on mass unless otherwise specified. The amount of coating is the amount of absolute dry coating.

<Preparation of pulp-like material made of para-aromatic polyamide>
A homomixer in which 10 parts of poly (p-phenylene isophthalamide) having a log viscosity of 1.5 in sulfuric acid is dissolved in 90 parts of N, N-dimethylacetamide containing 15 parts of lithium chloride, and this solution is stirred at high speed. A pulp-like substance is obtained by introducing it into an aqueous solution of glycerin in the medium, and this pulp-like substance is passed through a single disc refiner to be fibrillated to a modified drainage degree of 88 mL, and a pulp-like substance composed of a para-aromatic polyamide (a pulp-like substance consisting of a para-aromatic polyamide). A modified drainage degree (88 mL) was obtained. Further, the pulp-like material obtained by the same method was fibrillated so as to have a modified drainage degree of 250 mL, and a pulp-like material made of a para-aromatic polyamide (modified drainage degree 250 mL) was obtained.

Example 1
<Preparation of base material>
87 parts of glass fiber (manufactured by Nitto Spinning Co., Ltd., trade name: CS 6DE-888, fiber diameter 6.5 μm x fiber length 6 mm), silanol-modified PVA fiber (wet heat adhesive binder fiber, trade name: SPG056-11, Co., Ltd.) 8 parts of Kuraray, 0.6 decitex x 3 mm) and 5 parts of pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide are dispersed in water with a pulper to make a uniform concentration of 0.5%. A papermaking slurry was prepared, a wet paper web was obtained using a circular net paper machine, and dried with a Yankee dryer having a surface temperature of 120 ° C. to obtain a substrate having a basis weight of 51.9 g / m ² and a thickness of 0.386 mm. Made.

<Preparation of coating liquid for forming inorganic particle layer>
Kaolin (trade name: ASP (registered trademark) NC X-1, manufactured by BASF CORPORATION) 100 parts and water-soluble acrylic acid-based dispersant (trade name: Aron (registered trademark) T-50, manufactured by Toagosei Co., Ltd.) 0 .4 parts were mixed in water and stirred well to prepare a kaolin dispersion. Then, 20 parts of sepiolite (trade name: Milcon (registered trademark) SP-2, manufactured by Showa KDE Co., Ltd.) and 1.0 part of water-soluble acrylic acid-based dispersant (Aron T-50) were mixed in water and sufficiently stirred. , Sepiolite dispersion was prepared. Then, the total amount of the kaolin dispersion and the total amount of the sepiolite dispersion were mixed and stirred, and the concentration was adjusted with water to prepare a coating liquid having a solid content concentration of 40%.

<Making a fireproof sheet for wallpaper lining>
The base material is impregnated with a coating liquid by a size press, dried, and has an absolute dry coating amount of 56.3 g / m ² , a total basis weight of 108.2 g / m ² , and a thickness of 0.328 mm. A sheet was prepared.

Example 2
A base material having a basis weight of 52.1 g / m ² and a thickness of 0.367 mm by the same papermaking method as in Example 1 except that a pulp-like material made of para-aromatic polyamide (modified drainage degree 250 mL) was used. Was produced.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 55.0 g / m ² , a total basis weight of 107.1 g / m ² , and a thickness of 0.316 mm. I made a fireproof sheet for wallpaper lining.

Example 3
90 parts of the glass fiber used in Example 1 and 8 parts of the silanol-modified PVA fiber used in Example 1 2 parts of a pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide, Example 1 A substrate having a basis weight of 52.5 g / m ² and a thickness of 0.352 mm was prepared by the same papermaking method as in the above.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 56.1 g / m ² , a total basis weight of 108.6 g / m ² , and a thickness of 0.312 mm. I made a fireproof sheet for wallpaper lining.

Example 4
82 parts of the glass fiber used in Example 1, 8 parts of the silanol-modified PVA fiber used in Example 1, and 10 parts of a pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide were used in Example 1. A substrate having a basis weight of 48.3 g / m ² and a thickness of 0.315 mm was prepared by the same papermaking method as in the above.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 53.0 g / m ² , a total basis weight of 100.3 g / m ² , and a thickness of 0.268 mm. I made a fireproof sheet for wallpaper lining.

Example 5
Example 1 contains 90 parts of the glass fiber used in Example 1, 5 parts of the silanol-modified PVA fiber used in Example 1, and 5 parts of a pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide. A substrate having a basis weight of 50.2 g / m ² and a thickness of 0.351 mm was prepared by the same papermaking method as in the above.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 62.3 g / m ² , a total basis weight of 112.5 g / m ² , and a thickness of 0.298 mm. I made a fireproof sheet for wallpaper lining.

Example 6
To the base material of Example 5, 0.08 part of a water retention agent (manufactured by San Nopco, trade name: SN Sixner 926) was added to the coating liquid used in Example 1 with a comma coater (registered trademark). The surface is coated once on each of the front and back surfaces and dried to produce a fireproof sheet for wallpaper lining with a total absolute dry coating amount of 78.3 g / m ² , a total basis weight of 128.5 g / m ² , and a thickness of 0.352 mm. bottom.

Example 7
90 parts of glass fiber used in Example 1, 5 parts of PVA fiber (wet and heat adhesive binder fiber, trade name: VPB107-1, manufactured by Kuraray Co., Ltd., 1.1 decitex x 3 mm), from para-aromatic polyamide A substrate having a basis weight of 50.2 g / m ² and a thickness of 0.340 mm was prepared from 5 parts of the pulp-like material (modified drainage degree 88 mL) by the same papermaking method as in Example 1.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 57.8 g / m ² , a total basis weight of 108.0 g / m ² , and a thickness of 0.290 mm. I made a fireproof sheet for wallpaper lining.

Comparative Example 1
Except for 90 parts of the glass fiber used in Example 1, 9 parts of the silanol-modified PVA fiber used in Example 1, and 1 part of a pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide. A substrate having a basis weight of 50.6 g / m ² and a thickness of 0.321 mm was prepared by the same papermaking method as in Example 1.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 59.5 g / m ² , a total basis weight of 110.1 g / m ² , and a thickness of 0.301 mm. I made a fireproof sheet for wallpaper lining.

Comparative Example 2
Except for 82 parts of the glass fiber used in Example 1, 7 parts of the silanol-modified PVA fiber used in Example 1, and 11 parts of a pulp-like material (modified drainage degree 88 mL) made of para-aromatic polyamide. A substrate having a basis weight of 48.5 g / m ² and a thickness of 0.319 mm was prepared by the same papermaking method as in Example 1.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 55.7 g / m ² , a total basis weight of 104.2 g / m ² , and a thickness of 0.300 mm. I made a fireproof sheet for wallpaper lining.

Comparative Example 3
Basis weight 49.5 g / m ² by the same papermaking method as in Example 1 except that 90 parts of glass fiber used in Example 1, 5 parts of PVA fiber used in Example 7, and 5 parts of unbeaten NBKP were used. A substrate having a thickness of 0.315 mm was prepared.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 52.3 g / m ² , a total basis weight of 101.8 g / m ² , and a thickness of 0.288 mm. I made a fireproof sheet for wallpaper lining.

Comparative Example 4
Using 90 parts of the glass fiber used in Example 1, 5 parts of the silanol-modified PVA fiber used in Example 1, and a refiner, the solvent-spun cellulose fiber having an average fiber diameter of 12 μm and a fiber length of 5 mm was made finer to obtain a modified drainage degree. A substrate having a basis weight of 51.2 g / m ² and a thickness of 0.301 mm was prepared by the same papermaking method as in Example 1 except that 5 parts of fibrillated cellulose fibers were beaten to 100 mL.

This base material is impregnated with the coating liquid used in Example 1 by a size press, dried, and has an absolute dry coating amount of 57.9 g / m ² , a total basis weight of 109.1 g / m ² , and a thickness of 0.280 mm. I made a fireproof sheet for wallpaper lining.

Comparative Example 5
As a coating liquid for forming an inorganic particle layer, 100 parts of kaolin used in Example 1, 0.4 parts of a water-soluble acrylic acid-based dispersant, a vinyl chloride-based emulsion (trade name: Viniblanc (registered trademark) 278, solid content concentration). 43%, manufactured by Nissin Chemical Industry Co., Ltd.) 20 parts were mixed in water and sufficiently stirred to prepare a coating liquid having a solid content concentration of 40%.

This coating liquid was impregnated into a substrate having a basis weight of 50.2 g / m ² and a thickness of 0.351 mm prepared in Example 5 by a size press, dried, and an absolute dry coating amount of 68.4 g / m ² . , A fireproof sheet for wallpaper lining having a total basis weight of 118.6 g / m ² and a thickness of 0.326 mm was produced.

The following physical properties were measured and evaluated for the base material for the fireproof sheet for wallpaper lining and the fireproof sheet for wallpaper lining in Examples and Comparative Examples, and the results are shown in Table 2.

<Basis weight of refractory sheet for base material and wallpaper lining>
The basis weight of the base material and the total basis weight of the refractory sheet were measured according to JIS P8124: 2011. The coating amount of the inorganic particle layer was calculated by subtracting the basis weight of the base material from the total basis weight of the refractory sheet.

<Thickness of refractory sheet for base material and wallpaper lining>
The thickness was measured using an outer micrometer (trade name: Coolant proof (COOLANT PROOF (registered trademark)) micrometer MDC (registered trademark) -MX25, manufactured by Mitutoyo Co., Ltd.).

<Level difference Sk in the core part>
By the above-mentioned measuring method, the Sk of the surface of each wallpaper lining refractory sheet was measured with the surface in contact with the Yankee dryer as the surface when the base material was dried.

<Tensile strength of base material>
For each base material, 5 sample pieces of 250 mm in the flow direction x 50 mm in the width direction were cut out so that the long side was in the flow direction, and a desktop universal testing machine (manufactured by A & D Co., Ltd., product name: STB-) was cut out. A tensile test was performed using 1225S) at a tensile speed of 100 mm / min according to JIS P8113: 1998. The maximum value of tensile stress was defined as "tensile strength", and the average value of 5 sheets was used.

<80 ° C hot water collapse time of the base material>
For each base material, cut out three sample pieces of 200 mm in the flow direction x 50 mm in the width direction so that the long side is in the flow direction, attach a 11.6 g clip to the lower end of the sample pieces, and keep the temperature at 80 ° C ± 1 ° C. The sample piece was immersed in hot water for 100 mm to the center, and the time (seconds) from when the lower end to which the clip was attached was immersed in hot water until it collapsed was measured. The hot water collapse time was the average value of the three sheets.

<Coatability of inorganic particle layer>
The ease of coating when forming the inorganic particle layer on the base material was evaluated according to the following evaluation criteria.

◯: When the base material does not have paper breaks, cracks or cracks when applying the coating liquid △: When the base material is excessively tensioned or when the coating liquid is applied. When meandering, paper breaks, cracks or cracks occur in the base material ×: When applying the coating liquid, there is no problem in the coating process, and even if the tension is adjusted, the base material If paper breaks, cracks or cracks occur

<Fire resistance>
Regarding the fire resistance evaluation of the fireproof sheet for wallpaper lining, three test pieces with a size of 100 mm in the width direction x 100 mm in the flow direction were cut out from each sheet, and a burner (trade name: Lab Burner APTL, Phoenix Dent Co., Ltd.) was placed in the center of each test piece. The flame of (manufactured) was applied for 5 minutes. Then, the surface of the refractory sheet on the side exposed to the flame was visually observed and evaluated according to the following evaluation criteria. The flame temperature of the burner was 1000 ° C.

◯: There are no holes, cracks, melts or dents in the refractory sheet.
Δ: Melting or dents are slightly seen on the surface of the refractory sheet exposed to the flame.
X: There is a hole or a crack in the refractory sheet.

<Nonflammable>
For non-combustibility evaluation, two test pieces with a size of 100 mm in the width direction and 100 mm in the flow direction are cut out from each sheet and inserted into a heating electric furnace that can hold each test piece at 750 ° C ± 5 ° C. , Evaluated according to the following evaluation criteria.

◯: Does not ignite after insertion.
Δ: After insertion, it ignites and extinguishes itself within 5 seconds.
X: After insertion, it ignites and burns for 5 seconds or more.

<Flatness of polyvinyl chloride resin coated surface>
Cut the above fireproof sheet for wallpaper lining to a width of 15 cm and a length of 20 cm, place it on a glass plate with the surface facing up, and put foamed polyvinyl chloride sol for wallpaper on the surface with an applicator bar with a gap of 0.15 mm. It was coated and heated in a constant temperature hot air dryer at 150 ° C. for 25 seconds to gel. Then, it was heated with a constant temperature hot air dryer at 220 ° C. for 40 seconds to foam the foamed polyvinyl chloride sol. The unevenness of the foamed PVC surface (foamed surface) was visually observed and evaluated according to the following evaluation criteria.

◯: The foamed surface is smooth.
Δ: The foamed surface is slightly uneven.
X: The foamed surface has large irregularities.

<Powder drop>
When the surface of the above-mentioned fireproof sheet for wallpaper lining was touched by hand, the state of inorganic particles adhering to the hand and the powder falling when the sheet was cut with a desktop guillotine cutter were visually observed and evaluated according to the following criteria. ..

◯: Inorganic particles do not adhere to the hands and do not fall off even when cut.
Δ: Inorganic particles slightly adhered to the hands, and when 10 or more pieces were cut, powder falling was observed.
X: Inorganic particles adhere to the hands, and when cut, powder is seen to fall off.

<Flexibility>
After applying the above-mentioned fireproof sheet for wallpaper lining, when the sheet was wrapped around a paper tube having an outer diameter of 10 cm with a coater reeler, the state of the sheet was visually observed and evaluated according to the following criteria.

◯: Can be wrapped neatly around a paper tube.
Δ: Immediately after winding the paper tube, the sheet is slightly lifted or wrinkled from the outer circumference of the paper tube, but it can be wound neatly after a while.
X: It cannot be wrapped neatly around the paper tube, and large floating, cracking, and wrinkles occur.

As shown in Table 2, the fireproof sheets for wallpaper lining produced in Examples 1 to 7 contain a base material and an inorganic particle layer, and the base material is glass fiber, wet heat adhesive binder fiber, and para-aromatic. The content of the pulp-like material made of para-aromatic polyamide is 2.0% by mass or more and 12.5% by mass or less with respect to the glass fiber, and the inorganic particle layer is contained. Contains inorganic particles and an inorganic binder. A pulp-like material made of para-aromatic polyamide fixes the glass fiber, and the moist heat-adhesive binder fiber further fixes the fixed intersection, so that the sheet does not easily collapse even when immersed in hot water at 80 ° C, and is inorganic. Even when the coating liquid for forming the particle layer was applied, no paper breakage or the like occurred. Further, the refractory sheets for wallpaper lining produced in Examples 1 to 7 were excellent in fire resistance and nonflammability. Further, the surface of the polyvinyl chloride resin coated surface was good in flatness, less powder was removed from the inorganic particle layer, and the flexibility was excellent.

Comparing Example 6 and Example 7, the use of silanol-modified polyvinyl alcohol fiber as the moist heat-adhesive binder fiber lengthened the hot water collapse time at 80 ° C. In addition, the coatability of the inorganic particle layer has been improved.

Comparing Example 1 and Example 2, when the modified drainage degree of the pulp-like material made of para-aromatic polyamide is increased, the pulp-like material made of para-aromatic polyamide decreases the fixing ability of the glass fiber. Therefore, the time required for the hot water to collapse at 80 ° C. was shortened.

Comparing Example 1, Example 3 and Example 4, the higher the content of the pulp-like material made of para-aromatic polyamide, the smaller the Sk because the voids between the glass fibers were filled. Further, the flatness of the surface coated with the polyvinyl chloride resin was improved in Examples 1 and 4, although some irregularities were observed in Example 3, and both were good. In Example 4, an inorganic particle layer was formed on the surface of the base material, and a slight powder drop was observed. Further, the higher the content of the pulp-like material made of para-aromatic polyamide, the longer the hot water collapse time at 80 ° C. because the pulp-like material immobilizes the glass fiber.

Comparing Example 1 and Example 6, the amount of the inorganic particle layer coated is increased, and Sk is smaller in Example 6 in which the inorganic particle layer is coated on the surface of the substrate by the surface coating method. rice field. However, the refractory sheet became hard and it became difficult to wind it with the reeler of the coater.

The fireproof sheet of Comparative Example 1 is a case where the content of the pulp-like material made of para-aromatic polyamide is less than 2.0% by mass, but the hot water collapse time at 80 ° C. is shortened, and the coating for forming an inorganic particle layer is formed. Paper breaks are more likely to occur when applying the work liquid. In addition, Sk became large, and large irregularities were observed on the surface coated with the polyvinyl chloride resin.

The fireproof sheet of Comparative Example 2 is a case where the content of the pulp-like material made of para-aromatic polyamide exceeds 12.5% by mass, but the pulp-like material made of para-aromatic polyamide is sandwiched between the glass fibers. In order to fill the voids, an inorganic particle layer is likely to be formed on the surface of the base material, Sk is reduced, and the surface of the foamed polyvinyl chloride resin coated surface is flat, but powder is easily removed. In addition, a decrease in tensile strength was observed, and the coatability of the inorganic particle layer was decreased.

Comparative Example 3 and Comparative Example 4 were cases containing cellulose fibers, but when they were inserted into a heating electric furnace at 750 ° C., the surface ignited and the nonflammability was insufficient. Further, since it does not contain a pulp-like substance made of a para-aromatic polyamide, the hot water collapse time at 80 ° C. is short, and paper breakage or the like occurs when the coating liquid for forming the inorganic particle layer is applied.

The fireproof sheet for wallpaper lining of Comparative Example 5 was a case where an organic binder was used for the inorganic particle layer, but it ignited when it was inserted into a heating electric furnace at 750 ° C., and its nonflammability was insufficient.

The fireproof sheet for wallpaper lining of the present invention relates to a wallpaper lining sheet for interiors used in houses and the like, and can be suitably used as a wallpaper lining sheet coated with foamed polyvinyl chloride (foamed vinyl chloride bisol).

Claims (2)

It contains a base material and an inorganic particle layer, and the base material contains a pulp-like material made of glass fiber, a moist heat-adhesive binder fiber, and a para-aromatic polyamide, and the pulp-like material made of the para-aromatic polyamide. A fireproof sheet for wallpaper lining, wherein the content is 2.0% by mass or more and 12.5% by mass or less with respect to glass fiber, and the inorganic particle layer contains inorganic particles and an inorganic binder. The fireproof sheet for wallpaper lining according to claim 1, wherein the moist heat-adhesive binder fiber is a silanol-modified polyvinyl alcohol fiber.

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