JP2021120490A - Wallpaper backing paper - Google Patents

Abstract

To provide a wallpaper backing paper having water resistance and capable of suppressing bubble formation in a paper stock even when using a wet paper strength agent, thereby preventing reduction of paper surface quality and soiling of a roll in a sheet making installation, and preventing cissing of a glue.SOLUTION: A wallpaper backing paper includes base paper including pulp, a polyamidopolyamine epihalohydrin resin, and a polyacrylamide resin, and a surface size agent applied to the base paper, wherein the surface size agent comprises a starch analog and a styrene-acrylic resin.SELECTED DRAWING: None

Description

The present invention relates to a wallpaper lining paper used as a lining material for a wallpaper made of resin.

For wallpaper made of a resin such as vinyl chloride resin or olefin resin, a liquid containing resin is applied and dried on the surface of the wallpaper backing paper, or vinyl chloride resin or olefin resin is applied to the surface of the wallpaper backing paper. It is formed by laminating synthetic resin layers made of such materials. After that, the wallpaper is given a design by embossing or printing as needed. To apply the wallpaper to the wall, apply water-soluble glue such as starch, vinyl acetate emulsion and methyl cellulose to the back and / or wall of the wallpaper backing paper, and then apply the wallpaper to the wall such as plywood, gypsum board and concrete. Paste it.

When the glue is applied to the back surface of the wallpaper backing paper and / or the glue is applied to the wall surface and then the wallpaper backing paper is attached, the moisture contained in the glue is absorbed by the wallpaper backing paper. Moisture may cause the wallpaper backing paper to soften and / or stretch, resulting in a decrease in the wet tensile strength of the wallpaper backing paper. The decrease in wet tensile strength causes wrinkling or breakage of the wallpaper and a decrease in workability of wallpaper application.
As an example of wallpaper backing paper with excellent wet tensile strength and underwater dimensional change rate, 0.5% by mass to 3.0% by mass of wet paper strength agent and 0.05% by mass to 0.3% by mass of rosin sizing agent are added to pulp. %, Kaolin in an amount of 5% by mass to 25% by mass, and a yield improver in an amount of 0.001% by mass to 0.035% by mass. A backing paper for wallpaper having a sizing degree of 1 to 20 seconds measured by the Steccht method measured according to JIS P 8122: 2004 is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-124448

Patent Document 1 contains a wet paper strength agent. Examples of the wet paper strength agent described in Patent Document 1 are polyamide epichlorohydrin, polyamine epichlorohydrin, epoxy resin, melamine resin and the like. Paper materials containing a wet paper force agent for pulp tend to generate bubbles in the papermaking process. When bubbles are generated in the paper material, the surface quality of the paper obtained by making the paper material deteriorates and the rolls in the papermaking equipment become dirty.
Further, as described above, when the moisture contained in the water-soluble glue is absorbed by the backing paper, the moisture of the glue softens and / or stretches the wallpaper backing paper, and as a result, the wet tensile strength of the wallpaper backing paper is increased. May decrease. However, if the water resistance is increased so as not to reduce the wet tensile strength by suppressing the absorption of water into the wallpaper backing paper, glue repelling occurs on the wallpaper backing paper.

In view of the above, an object of the present invention is to suppress the generation of bubbles in the paper material even when a wet paper force agent is used, reduce the deterioration of the surface quality of the paper and the stain on the roll in the papermaking equipment, and prevent the repellency of the glue. And to provide a wallpaper backing paper that is water resistant.

As a result of diligent research to solve the above problems, the present inventors achieve the object of the present invention by the following.

A wallpaper lining paper containing a base paper containing pulp, a polyamide polyamine epihalohydrin resin and a polyacrylamide resin, and a surface sizing agent applied to the base paper, wherein the surface sizing agent is starch or a styrene acrylic resin.

INDUSTRIAL APPLICABILITY According to the present invention, even if a wet paper force agent is used, it is possible to suppress the generation of bubbles in the paper material, reduce the deterioration of the surface quality of the paper and the stain on the roll in the papermaking equipment, prevent the repellency of the glue, and have water resistance. Wallpaper backing paper can be provided.

The present invention will be described in detail below.
The base paper constituting the wallpaper backing paper contains pulp, polyamide polyamine epihalohydrin resin and polyacrylamide resin.

The pulp is conventionally known in the field of papermaking. Examples of pulp include chemical pulps such as LBKP (Leaf Bleached Kraft Pulp) and NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure GroundWood pulp), RMP (Refiner Mechanical Pulp), and TMP (ThermoMechanical Pulp). ), CTMP (ChemiThermoMechanical Pulp), BCTMP (Bleached ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), mechanical pulp such as CGP (ChemiGroundwood Pulp), and used paper pulp such as DIP (DeInked Pulp). Examples of the raw material for pulp include conifers and hardwoods, as well as hemp, linter, straw, bamboo, sugar cane, phragmites, fruit, mulberry, mitsumata and ganpi. Pulp is one or more selected from the group consisting of these.

The base paper is pulp, and if necessary, fillers, sizing agents, binders, fixing agents, yield improvers, drainage improvers, cationizing agents such as cationic resins and polyvalent cation salts, wet paper strength agents, and wet paper strength agents. It can be obtained by making a paper material containing one or more kinds of additives selected from the group consisting of dry paper strength agents and the like. In addition to the above additives, the base paper also contains pigment dispersants, thickeners, fluidity improvers, defoamers, defoamers, mold release agents, foaming agents, penetrants, color dyes, color pigments, and UV absorbers. It can be obtained by blending one or more kinds of auxiliaries selected from the group consisting of agents, antioxidants, antiseptic agents, antibacterial agents, water resistant agents and the like into paper materials as necessary.

Paper making is performed by adjusting the paper material to acidic, neutral or alkaline and using a conventionally known paper machine. Examples of the paper machine include a long net paper machine, a twin wire paper machine, a combination paper machine, a circular net paper machine, and a Yankee paper machine.

The base paper can be subjected to calendar processing. The calendar processing may be performed either before or after the size press described later. The calendar process is a process of averaging the smoothness and thickness by passing paper between rolls. Examples of the calendar processing device include a machine calendar, a soft nip calendar, a super calendar, a multi-stage calendar, and a multi-nip calendar.

In some embodiments, the base paper contains a filler, a sizing agent, a yield improver, a wet paper strength agent and a dry paper strength agent.
The filler is a white pigment conventionally known in the papermaking field. Examples of fillers are calcium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, active clay, diatomaceous soil, silica, alumina, hydroxide. Examples of white inorganic pigments such as aluminum, lithopone, zeolite, magnesium carbonate, and magnesium hydroxide include white organic pigments such as styrene-based plastic pigments, acrylic-based plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins. The filler is preferably one or more selected from the group consisting of these. In at least one embodiment, the filler is calcium carbonate in terms of opacity.
In some embodiments, the wallpaper backing paper has a filler content of 100 parts by mass or more and 400 parts by mass or less with respect to 1000 parts by mass of pulp in the wallpaper backing paper.

The sizing agent is conventionally known in the field of papermaking. Examples of sizing agents include rosin, petroleum resin sizing agents, wax emulsion sizing agents, alkyl ketene dimers, alkenyl succinic anhydride, stearic anhydride and the like. In at least one embodiment, the sizing agent is an alkyl ketene dimer. The reason for this is that the alkyl ketene dimer has a lactone ring in its chemical structure and chemically reacts with cellulose, so that it is effective not only in size but also in water resistance.
In some embodiments, the wallpaper backing paper has a sizing agent content of 0.5 parts by mass or more and 4 parts by mass or less with respect to 1000 parts by mass of pulp in the wallpaper backing paper.

Yield improvers are conventionally known in the field of papermaking. Examples of the yield improver include inorganic salts such as aluminum sulfate, polyethyleneimine, polyamide and polyethylene oxide. In at least one embodiment, the yield improver is aluminum sulphate. The reason for this is that aluminum sulfate has a high coagulating ability due to aluminum ions, so that it is effective not only in improving the yield but also in water resistance.
In some embodiments, the wallpaper backing paper contains a yield improver of 1 part by mass or more and 9 parts by mass or less with respect to 1000 parts by mass of pulp in the wallpaper backing paper.

Wet paper force agents are conventionally known in the field of papermaking. Examples of wet paper strength agents include epichlorohydrin in a molecule obtained by reacting polyamide containing melamine resin, urea resin, polyamide resin, urea formaldehyde resin, melamine formaldehyde resin, polyamide epichlorohydrin resin, polyamide polyamine epichlorohydrin resin, and the like. Examples thereof include a polyamide epoxy resin having an epoxy group.

In the wallpaper backing paper, the base paper contains at least a polyamide polyamine epihalohydrin resin as a wet paper strength agent.
In some embodiments, the wallpaper backing paper is a polyamide polyamine epihalohydrin resin in an amount of 50% by mass or more in the wet paper strength agent of the base paper.
In at least one embodiment, the wallpaper backing paper has a polyamide polyamine epihalohydrin resin content of 5 parts by mass or more and 20 parts by mass or less with respect to 1000 parts by mass of pulp in the wallpaper backing paper. The reason for this is that within this range, the water resistance of the wallpaper backing paper is better and the generation of bubbles can be reduced in the paper material state.

The polyamide polyamine epihalohydrin resin is a resin obtained by reacting a polyamide polyamine with epihalohydrin.
Examples of epichlorohydrin include epichlorohydrin and epichlorohydrin. Epichlorohydrin is preferred from the standpoint of industrial availability.
Examples of the polyamide polyamine include a polycondensate of a dicarboxylic acid and a polyalkylene polyamine. Dicarboxylic acids are dicarboxylic acids, dicarboxylic acid esters or dicarboxylic acid anhydrides. Dicarboxylic acids include, for example, aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid and adipic acid, dicarboxylic acids such as aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and terephthalic acid, and sodium or potassium dicarboxylic acids. Such as salt can be mentioned. Dicarboxylic acid esters are these esters, and dicarboxylic acid anhydrides are these anhydrides. As the dicarboxylic acids, two or more different dicarboxylic acids can be used in combination. Examples of the polyalkylene polyamines include diethylenetriamine, triethylenetetramine, and tetraethylenepentamine. As the polyalkylene polyamines, two or more different polyalkylene polyamines can be used in combination.

In the polycondensation reaction, for example, aminocarboxylic acids or diamines can be used in combination. Examples of aminocarboxylic acids include aminocarboxylic acids such as glycine, alanine and aminocaproic acid, and lactams such as esters thereof and caprolactam. Examples of diamines include ethylenediamine, 1,3-propanediamine and 1,4-butanediamine. Examples of the polycondensation reaction include a method of reacting under normal pressure or reduced pressure at a temperature of about 50 ° C. or higher and 250 ° C. or lower to remove the produced water or alcohol from the system.

The resulting polyamide polyamine is then subjected to a reaction with epihalohydrin. The reaction between the polyamide polyamine and epihalohydrin is carried out, for example, in an aqueous solution having a resin concentration of about 10% by mass or more and 70% by mass or less. The reaction between the polyamide polyamine and epihalohydrin is usually carried out at 10 ° C. or higher and 80 ° C. or lower.
The polyamide polyamine epihalohydrin resin is commercially available from, for example, Seiko PMC Corporation, Taoka Chemical Industry Co., Ltd., Arakawa Chemical Industry Co., Ltd., and the like.

Dry paper strength agents are conventionally known in the field of papermaking. Examples of the dry paper strength agent include anionic polyacrylamide resin, cationic polyacrylamide resin, amphoteric polyacrylamide resin, cationic starch, dialdehyde starch and vegetable gum.

In the wallpaper backing paper, the base paper contains at least a polyacrylamide resin as a drying paper strength agent.
In some embodiments, the wallpaper backing paper is a polyacrylamide resin in an amount of 50% by mass or more in the dry paper strength agent of the base paper. In at least one embodiment, the polyacrylamide resin is an anionic polyacrylamide resin.
In at least one embodiment, the wallpaper backing paper has a polyacrylamide resin content of 2 parts by mass or more and 10 parts by mass or less with respect to 1000 parts by mass of pulp in the wallpaper backing paper. The reason for this is that within this range, the generation of bubbles can be reduced in the paper material state in combination with the wetting paper strength agent.

The polyacrylamide resin is a resin obtained by polymerizing _{acrylamide (CH 2} = CHCONH _2). The polyacrylamide resin is a resin obtained by homopolymerizing acrylamide or a resin obtained by copolymerizing with another monomer copolymerizable with acrylamide. Here, the polyacrylamide resin is a resin containing acrylamide in an amount of 50 mol% or more in the molecule.

Other monomers that can be copolymerized with acrylamide include, for example, alkylacrylamides such as N-methylacrylamide, dialkylacrylamides such as N, N-dimethylacrylamide, dialkylaminoalkylacrylamides such as dimethylaminoethylacrylamide and dimethylaminopropylacrylamide. Hydroxyalkyl acrylamides such as N- (hydroxymethyl) acrylamide and N- (2-hydroxyethyl) acrylamide, alkyl methacrylamides such as diacetone acrylamide, methacrylamides, N-methyl methacrylamides, N, N-dimethyl methacrylamides and the like. Dialkylaminoalkylmethacrylates such as dialkylmethacrylamides, dimethylaminoethylmethacrylates and dimethylaminopropylmethacrylates, hydroxyalkylmethacrylates such as N- (hydroxymethyl) methacrylicamides and N- (2-hydroxyethyl) methacrylicamides, di. Acrylamide can be mentioned.
Further, other monomers that can be copolymerized with acrylamide include, for example, vinyl cyanide-based monomers, α, β-unsaturated carboxylic acid and salts thereof, unsaturated carboxylic acid anhydrides, unsaturated carboxylic acid esters, and vinyl-based monomers. Monomers and olefinic monomers can be mentioned.
Examples of the vinyl cyanide-based monomer include acrylonitrile, methacrylonitrile, 2-hydroxyethylacrylonitrile, chloroacrylonitrile, chloromethacrylonitrile, methoxyacrylonitrile, and methoxymethacrylonitrile. Examples of the α, β-unsaturated carboxylic acid include acrylic acid, methacrylic acid and itaconic acid. Examples of the unsaturated carboxylic acid anhydride include maleic anhydride and itaconic acid anhydride. Examples of the unsaturated carboxylic acid ester include methyl acrylate and methyl methacrylate. Examples of the vinyl-based monomer include styrene, α-methylstyrene, vinyl chloride and vinyl alcohol. Examples of the olefin-based monomer include ethylene and propylene.
The other monomer copolymerizable with acrylamide is one or more selected from the group consisting of these.

The polyacrylamide resin can be produced by conventionally known polymerization methods such as solution polymerization, suspension polymerization, precipitation polymerization, dispersion polymerization and emulsion polymerization.
The polyacrylamide resin is commercially available from, for example, Seiko PMC Corporation and Harima Chemicals Corporation.

In at least one embodiment, the dry paper strength agent is an anionic polyacrylamide resin. The reason for this is that the generation of bubbles can be reduced in the state of paper charges.
The anionic polyacrylamide resin is, for example, a homopolymer of acrylamide, a partial hydrolyzate of a copolymer of acrylamide and another monomer copolymerizable with acrylamide, or an anionic group such as acrylamide and acrylic acid or methacrylic acid. Examples thereof include a copolymer with a monomer having, or a copolymer obtained by copolymerizing a mixture of acrylamide and an α or β-unsaturated carboxylic acid monomer. Here, the anionic polyacrylamide resin has a colloid titration value of −0.5 meq / g or less measured at pH 9.0.

The wallpaper backing paper is made by applying a surface sizing agent to the base paper. The wallpaper backing paper contains a surface sizing agent by imparting a surface sizing agent to the base paper. The surface sizing agent is starches and styrene acrylic resin. When starches and styrene acrylic resin are contained as the surface sizing agent, water resistance and prevention of glue repellency can be obtained by the synergistic effect with the above-mentioned polyamide polyamine epihalohydrin resin and polyacrylamide resin. Unless starches and styrene acrylic resin are contained as the surface sizing agent, it is not possible to sufficiently prevent repellency of the glue and / or obtain sufficient water resistance.
In some embodiments, the wallpaper backing paper is provided with starch as a surface sizing agent and a dry solid content of 1 g / m ² or more and 5 g / m ² or less per side of the base paper and styrene acrylic resin as a surface sizing agent. the amount is base paper per side 0.05 g / ^{m 2} or more 1 g / ^{m 2} of the following as a dry solid. The reason for this is that if it is contained in the above range, the repellency of the glue is prevented and the water resistance is improved.

Starches are conventionally known in the field of papermaking. Starches are polysaccharides in which glucose is polymerized by glycosidic bonds, and polysaccharides in which glucose is polymerized by glycosidic bonds and the hydroxyl group of glucose is modified by various substituents. Examples of starches include esterified starches such as starches, oxidized starches, enzyme-modified starches, etherified starches, cationic starches, amphoteric starches, dialdehyde starches, phosphoric acid esterified starches and urea phosphoric acid esterified starches, hydroxyethylated. Examples thereof include starch and hydroxybutylated starch.

The styrene-acrylic resin is a resin obtained by at least copolymerizing a styrene-based monomer and an acrylic-based monomer (a monomer having an acryloyl skeleton or a methacryloyl skeleton). Here, the styrene-acrylic resin is a resin in which the total amount of the styrene-based monomer and the acrylic-based monomer is 50 mol% or more in the molecule.

Styrene-based monomers include alkyl-substituted styrenes such as styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene and 4-ethylstyrene. , 2-Chlorostyrene, 3-chlorostyrene, halogen-substituted styrene such as 4-chlorostyrene, vinylnaphthalene and the like. The styrene-based monomer is one or more selected from the group consisting of these.

Examples of the acrylic monomer include methacrylic acid and its salt, acrylic acid and its salt, methacrylic acid ester, and acrylic acid ester.
Methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, n-pentyl methacrylate, n-hexyl methacrylate, n-heptyl methacrylate, n-octyl methacrylate, N-decyl methacrylate, n-dodecyl methacrylate, n-tetradecyl methacrylate, n-hexadecyl methacrylate, n-octadecyl methacrylate, isopropyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, isopentyl methacrylate, methacrylic acid Amyl, neopentyl methacrylate, isohexyl methacrylate, isoheptyl methacrylate, isooctyl methacrylate, 2-ethylhexyl methacrylate, alkyl methacrylates such as cyclohexyl methacrylate and t-butylcyclohexyl methacrylate, phenyl methacrylate, biphenyl methacrylate, methacrylic Methacrylic acid aryl esters such as diphenylethyl acid, t-butylphenyl methacrylate, and terphenyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, methoxyethyl methacrylate, 2-hydroxyethyl methacrylate, β-carboxylate methacrylate Ethyl and methacrylic acid can be mentioned.
Acrylic acid esters include, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate. , N-decyl acrylate, n-dodecyl acrylate, n-tetradecyl acrylate, n-hexadecyl acrylate, n-octadecyl acrylate, isopropyl acrylate, isobutyl acrylate, t-butyl acrylate, isopentyl acrylate, acrylic Amil acid, neopentyl acrylate, isohexyl acrylate, isoheptyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, alkyl acrylates such as cyclohexyl acrylate and t-butyl cyclohexyl acrylate, phenyl acrylate, biphenyl acrylate, Acrylic acid aryl ester such as diphenylethyl acrylate, t-butylphenyl acrylate, terphenyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, methoxyethyl acrylate, 2-hydroxyethyl acrylate, β-acrylate Examples thereof include carboxyethyl and acrylamide.
The acrylic monomer is one or more selected from the group consisting of these.

The wallpaper backing paper can contain a conventionally known surface sizing agent other than starches and styrene acrylic resin as a surface sizing agent for the base paper. The surface sizing agent is a sizing agent applied by a size press. Conventionally known surface sizing agents other than starches and styrene acrylic resins include, for example, carboxymethyl cellulose, polyvinyl alcohol, and acrylic resins.
In at least one embodiment, the wallpaper backing paper is made of starch and styrene acrylic resin in an amount of 50% by mass or more of the total amount of the surface sizing agent applied.

A size press for applying a surface sizing agent to a base paper is a conventionally known method. Size presses include, for example, inclined size presses, horizontal size presses, rod metering size presses, roll metering size presses and blade metering size presses as film transfer methods, and shim sizers, optimizers and speeds for rod metering size presses. Sizars and film presses can be mentioned, and roll metering size presses can be gate roll coaters. Other examples include bill blade coaters, twin blade coaters, velva papa coaters, tab size presses and calendar size presses.

Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to these examples. Here, "parts by mass" and "% by mass" represent "parts by mass" and "% by mass" of the amount of dry solids or the amount of substantial components, respectively. The imparted amount indicates the amount of dry solid content.

For each Example and each Comparative Example, a wallpaper backing paper was prepared by the following procedure.

<Base paper>
The paper charges were prepared using water as a medium according to the following contents.
LBKP (Drainage degree 450 mlcsf) 650 parts by mass NBKP (Drainage degree 530 mlcsf) 350 parts by mass Light calcium carbonate 300 parts by mass Alkylketen dimer 2 parts by mass Aluminum sulfate 5 parts by mass Wetting paper strength agent A (polyamide polyamine epihalohydrin resin)
The blending amount is shown in Table 1. Wet paper strength agent B (urea formaldehyde resin) The blending amount is shown in Table 1. Dry paper strength agent A (polyacrylamide resin) The blending amount is shown in Table 1. Dry paper strength agent B (cationized starch) ) The blending amount is shown in Table 1.

<Surface sizing agent>
The surface size liquid containing the surface size was prepared using water as a medium according to the following contents.
The amount of oxidized starch is shown in Table 1. The amount of styrene acrylic resin is shown in Table 1. The amount of polyvinyl alcohol is shown in Table 1.

Polyamide polyamine epichlorohydrin resin is Hoshiko PMC WS4020, which is a polyamide polyamine epichlorohydrin resin, Mitsui Kagaku Co., Ltd. Euramine (registered trademark) P-1500 is used for urea formaldehyde resin, and Nippon Food Processing Co., Ltd. Neotac (registered trademark) is used for cationized starch. # 30T, Arakawa Chemical Industry Co., Ltd. POLYSTRON (registered trademark) 117, which is an anionic polyacrylamide resin for polyacrylamide resin, Nippon Food Processing Co., Ltd. MS # 3800 for oxidized starch, and Harima Kasei Co., Ltd. for styrene acrylic resin. Size KN500 was used, and Kuraray Co., Ltd. Kuraray Poval (registered trademark) 5-98 was used as the polyvinyl alcohol.

<Making wallpaper backing paper>
The above paper material was made with a long net paper machine to obtain a base paper having ^{a basis weight of 90 g / m 2.} Subsequently, a surface sizing liquid containing a surface sizing agent was applied to both sides of the obtained base paper using a size press and dried. The total amount of the surface sizing agent applied was 4 g / m ² per side in terms of dry solid content. After size pressing, calender processing was applied to make wallpaper backing paper.

<Dirt on the roll and surface quality of the paper>
In the papermaking, the stains on the rolls in the papermaking apparatus due to the generation of bubbles in the paper material and the surface quality of the obtained base paper were visually observed and evaluated according to the following criteria. In the present invention, if the evaluation of the wallpaper backing paper is 2 to 4, it is possible to suppress the generation of bubbles in the paper material and prevent the rolls in the papermaking equipment from becoming dirty and the surface quality of the paper from being deteriorated.
4: There is no stain on the roll, and the surface quality of the base paper is good.
3: There is almost no stain on the roll, and the surface quality of the base paper is generally good.
2: It is inferior to 3 above, and although there is a slight stain on the roll,
The surface quality of the base paper is practical.
1: The roll is dirty and the surface quality of the base paper is deteriorated.

The evaluation results are shown in Table 1.

The obtained wallpaper backing paper was evaluated for water resistance and adhesive repellency.

<Water resistance>
The wallpaper backing paper was cut into a size of 15 mm on the MD side and 250 mm on the CD side. The cut wallpaper backing paper was dried at 110 ° C. for 10 minutes. The dried wallpaper backing paper is immersed in water at 20 ° C. for 10 minutes, and the water adhering to the surface of the wallpaper backing paper after immersion is wiped off. Wet tensile strength was measured according to the above criteria and evaluated according to the following criteria. In the present invention, the wallpaper backing paper shall have water resistance if the evaluation is 2 or 3.
3: 0.4 kN / m or more.
2: 0.35 kN / m or more and less than 0.4 kN / m.
1: Less than 0.35 kN / m.

<Glue repellent>
One side of the wallpaper backing paper was coated with wallpaper construction glue (Yayoi Chemical Industry Co., Ltd. Rua Mild (registered trademark)) using a hand-painted bar so ^{that the coating amount was 12 g / m 2.} At this time, the repellency of glue on the wallpaper backing paper was visually observed and evaluated according to the following criteria. In the present invention, the wallpaper backing paper can prevent repellency of glue if the evaluation is 3 or 4.
4: There is no glue repellent, and the glue adheres to the wallpaper backing paper.
3: Although there is a very small part where glue repellent is present,
Glue adheres to the wallpaper backing paper.
2: Although there is a slight part where glue repellent is present,
Glue can be adhered to the wallpaper backing paper, which is practical.
1: There is a part where the glue is repelled, and the glue cannot be adhered well to the wallpaper backing paper.

The evaluation results are shown in Table 1.

From Table 1, the wallpaper backing papers of Examples 1 to 5 satisfying the constitution of the present invention are found in the paper surface quality deterioration and the papermaking equipment by suppressing the generation of bubbles of the paper material even when a wet paper force agent is used. It can be seen that the stain on the roll can be reduced, the repellency of the glue is prevented, and the roll is water resistant. On the other hand, it can be seen that the wallpaper backing papers of Comparative Examples 1 to 6 that do not satisfy the configuration of the present invention cannot satisfy at least one of the effects according to the present invention.

Claims (1)

A wallpaper lining paper containing a base paper containing pulp, a polyamide polyamine epihalohydrin resin and a polyacrylamide resin, and a surface sizing agent applied to the base paper, wherein the surface sizing agent is starch or a styrene acrylic resin.