JP5894509B2 - Non-woven fabric for flame retardant inkjet recording - Google Patents

Description

  The present invention relates to a flame retardant nonwoven fabric that can be used indoors as an interior material such as a banner, poster, wallpaper, etc., and more particularly to a flame retardant nonwoven fabric having suitable ink jet printing suitability.

  In recent years, printing by an ink jet printer can cope with a smaller number of copies compared to offset printing having a plate making process due to the widespread use of wide format type printers, and can be printed at low cost. Also, printing on large prints such as banners and banners with a width and / or length of several meters is possible, and it is used for many applications such as interior materials such as wallpaper and posters. As a printing medium used for such a large-sized printed material, a nonwoven fabric that is lightweight, highly flexible, and excellent in durability is often used as compared with paper and resin sheets.

  Interior materials such as banners and wallpaper, posters, etc. are required to pass a flameproof test stipulated by the Fire Service Act to prevent fire accidents in buildings when used indoors. It is also necessary to impart flame retardancy. As a method of imparting flame retardancy to the nonwoven fabric, a method of adding an inorganic flame retardant such as aluminum hydroxide to the fiber itself at the stage of manufacturing the nonwoven fabric, a solid flame retardant or the like with an impregnated coater, etc. to the finished nonwoven fabric There is a method of impregnating with an impregnating liquid containing a liquid flame retardant.

  In addition, the nonwoven fabric used in these applications may be provided with an ink receiving layer on the surface of the nonwoven fabric used as a base material in order to impart ink jet printability. As such a flame-retardant nonwoven fabric imparted with ink jet printability, Patent Document 1 discloses a flame-proof printing sheet in which an ink-receiving layer is provided on a substrate made of a nonwoven fabric impregnated with a specific flame retardant. ing. Patent Document 2 discloses a technique for improving the flame retardancy by containing a specific amount of a specific flame retardant in the ink receiving layer. Patent Document 3 discloses an ink jet recording fabric in which an ink receiving layer composed of an upper layer and a lower layer is provided on a flame retardant base fabric, and a flame retardant is contained in the lower ink receiving layer. Yes.

JP 2002-61071 A Japanese Patent No. 3787774 Japanese Patent No. 3923739

  However, the technique described in Patent Document 1 has a problem in that the flame retardant in the nonwoven fabric base material bleeds into the ink receiving layer over time, causing a decrease in inkjet printing performance and a decrease in flame retardancy. In addition, the technique described in Patent Document 2 has a problem in that the flame retardant blended in the ink receiving layer affects printability and causes print bleeding and print unevenness. Further, in the technique described in Patent Document 3, a flame retardant is not blended in the upper ink receiving layer, but a flame retardant is blended in the lower ink receiving layer. There is a problem that the ink jet printability is adversely affected, and in addition, since two types of ink receiving layers are provided, there is a problem that the manufacturing cost is increased. As described above, with the techniques described in Patent Documents 1 to 3, it is difficult to achieve both flame retardancy and ink jet printing suitability.

  Further, regarding the flame retardancy, the method of subjecting the fiber itself to flame retardancy increases the cost of manufacturing the nonwoven fabric, and the use of such a nonwoven fabric increases the manufacturing cost.

  The production cost can be kept relatively low by using a method of impregnating a nonwoven fabric with an impregnating liquid containing a flame retardant as described above, compared with the case of using a nonwoven fabric using flame-retardant fibers. If a solid flame retardant is used as a flame retardant, the surface of the nonwoven fabric becomes rough and the texture is impaired, and in addition, the solid flame retardant tends to fall off the nonwoven fabric, so there is a problem of poor durability even with excellent flame retardancy. .

  In addition, when a nonwoven fabric is impregnated with a liquid flame retardant alone, the impregnated liquid flame retardant does not stay in the nonwoven fabric itself but bleeds into the ink receiving layer, resulting in a decrease in ink jet printing suitability. There are also problems such as ink bleeding on the printing surface due to the influence of the flame retardant, and deterioration of the storage stability of the inkjet printing surface. Furthermore, the amount of the flame retardant impregnated in the nonwoven fabric is reduced by transferring the liquid flame retardant bleeding in the ink receiving layer to the article that is in contact with the ink receiving layer. There is a problem that it is impossible to maintain the flame retardance at a level that passes a prescribed flameproof test.

  The present invention has been made in view of such problems, and the object of the present invention is to determine excellent ink jet printing suitability and fire fighting law while using a nonwoven fabric made of fibers not subjected to flame retardant treatment. Another object of the present invention is to provide a non-woven fabric for flame retardant inkjet recording, which has a level of flame retardant that passes the flame resistance test.

  Other objects and effects of the present invention will be easily understood by those skilled in the art by referring to the following description of the present specification.

  In order to achieve the above-mentioned object, the nonwoven fabric for flame-retardant inkjet recording of the present invention is impregnated with a liquid flame retardant and a binder impregnated into a nonwoven fabric composed of fibers that have not been subjected to flame retardant treatment. By suppressing the bleeding and transfer of the flame retardant, it has excellent ink jet printing suitability and carries a flame retardance of a level that passes a flame proof test defined by the Fire Service Law.

Specifically, the nonwoven fabric for flame-retardant inkjet recording of the present invention is provided with an ink receiving layer on at least one surface of a flame-retardant nonwoven fabric substrate, and the flame-retardant nonwoven fabric substrate is subjected to flame-retardant treatment. A non-woven fabric made of unmade fibers is impregnated with a flame retardant impregnating liquid, the flame retardant impregnating liquid includes a liquid flame retardant and a binder, and the binder is added to 100 parts by mass of the flame retardant. On the other hand, it is contained in a range of 3 to 20 parts by mass in terms of solid content, and the ink receiving layer does not contain a flame retardant and a flame retardant binder, and is 6 to 20 g / m ² per side in terms of solid content. The after flame time according to JIS L1091 A-1 method is 3 seconds or less, the residual dust time is 5 seconds or less, and the combustion area is 30 cm ² or less.

Here, the standard based on the JIS L1091 A-1 method is adopted as the flame retardant evaluation standard because the test conditions and the evaluation standard are set in detail in the JIS L1091 A-1 method. This is because the flame proof standard stipulated in the Fire Service Law is satisfied if it satisfies Category 3. The conditions that the after flame time is 3 seconds or less, the residual dust time is 5 seconds or less, and the combustion area is 30 cm ² or less correspond to Category 3 (acceptance criteria) of the same standard.

  According to such a configuration, flame retardancy is imparted by the liquid flame retardant, and bleeding and transfer of the liquid flame retardant can be suppressed by the function of the binder contained in the flame retardant impregnation liquid. Even if an ink receiving layer is provided on the porous nonwoven fabric substrate, the ink jet printing suitability is not hindered, and the ink jet printing suitability is excellent, and the impregnation amount of the flame retardant is not reduced by the transfer. For this reason, even if a flame retardant or a flame retardant binder is not included in the ink receiving layer, the flame retardant inkjet recording nonwoven fabric as a whole has a level of flame retardancy that passes the fire resistance test stipulated by the Fire Service Act. It can be set as the nonwoven fabric for flame-retardant inkjet recording to fill.

  In a preferred embodiment of the present invention, the binder contained in the flame retardant impregnation liquid may be one or more selected from ethylene-vinyl acetate copolymer, polyurethane resin, and polyvinyl alcohol. good. According to such a configuration, bleeding and transfer of the flame retardant can be further suppressed, and a good flame retardant nonwoven fabric for inkjet recording having both ink jet printing suitability and flame retardancy can be obtained.

  In a preferred embodiment of the present invention, the flame retardant impregnation liquid contains a penetrant, and the penetrant is in a range of 0.5 to 10 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant. May be included. According to such a configuration, impregnation unevenness is less likely to occur even in a non-woven fabric having a large variation in density, and the flame-retardant impregnation liquid can be easily permeated uniformly.

  In a preferred embodiment of the present invention, the liquid flame retardant is a non-halogen flame retardant and may contain a phosphorus compound or a phosphorus organic compound. According to such a configuration, a non-woven fabric for flame-retardant inkjet recording is obtained in which harmful substances such as dioxins are hardly generated even when the non-woven fabric is burned, such as when incinerated.

  In preferable embodiment of this invention, the said nonwoven fabric may consist of a polyethylene fiber or a polyester fiber. According to such a configuration, a non-woven fabric for flame retardant inkjet recording that is more excellent in strength and durability can be obtained.

  In preferable embodiment of this invention, the said flame-retardant impregnation liquid is impregnated so that the flame retardant contained in an impregnation liquid may be 15 mass parts or more in conversion of solid content with respect to 100 mass parts of nonwoven fabrics. May be. By satisfying such a configuration, high flame retardancy is obtained, and it becomes easy to satisfy the conditions of Category 3 in the JIS L1091 A-1 method, and thus the standards of the Fire Service Act.

  In a preferred embodiment of the present invention, the penetrant contained in the flame retardant impregnating liquid is monoalkyl ammonium chloride, polyoxyalkylene branched decyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl ether. It may be one or more selected from the inside. According to such a configuration, since the penetrant is highly compatible with water, the flame-retardant impregnating liquid tends to become a more uniform liquid.

  In a preferred embodiment of the present invention, the flame retardant and the flame retardant binder not included in the ink receiving layer are a halogen-free flame retardant, polyvinylidene chloride, polyvinyl chloride, polyvinyl acetate, polybutylene terephthalate, and polycarbonate. May be. Since these flame retardants and flame retardant binders are not included in the ink receiving layer, ink acceptability is not hindered, and good ink jet printing suitability is obtained.

  In a preferred embodiment of the present invention, the flame retardant impregnating solution may further contain a solid flame retardant. The use of the solid flame retardant alone has the above-mentioned problems, but by using it together with the liquid flame retardant and the binder, such a problem is solved and the solid flame retardant can be used.

Moreover, this invention can also be grasped | ascertained as a manufacturing method of the flame-retardant inkjet recording nonwoven fabric. The method for producing a nonwoven fabric for flame retardant inkjet recording according to the present invention comprises a flame retardant impregnating liquid using a flame retardant and a binder of 3 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant. A flame retardant impregnating liquid preparation step to be prepared, a flame retardant nonwoven fabric base material manufacturing step for making a flame retardant nonwoven fabric base material by impregnating the flame retardant impregnating liquid into a nonwoven fabric, an inorganic compound, a binder and water are used. The ink receiving layer coating liquid preparation step for preparing the ink receiving layer coating liquid, and applying the ink receiving layer coating liquid to at least one surface of the flame retardant nonwoven fabric substrate, in terms of solid content per side An ink receiving layer coating step in which an ink receiving layer is provided so as to be in the range of 6 to ²⁰ g / m ² , and the flame retardant includes at least a liquid flame retardant, and thereby according to JIS L1091 A-1 method. Afterflame time A non-woven fabric for flame-retardant inkjet recording having a residual time of 3 seconds or less, a residual time of 5 seconds or less, and a combustion area of 30 cm ² or less is produced.

  And according to such a structure, the bleeding and transfer of a flame retardant are suppressed and the nonwoven fabric for flame-retardant inkjet recording which has the stable flame retardance can be manufactured. In addition, since the ink receiving layer does not contain a flame retardant and a flame retardant binder, ink acceptability is not hindered and excellent ink jet printing suitability is obtained.

  As is clear from the above description, the non-woven fabric for flame retardant inkjet recording of the present invention has the flame retardant added to the non-woven fabric base material by suppressing the bleeding and transition of the liquid flame retardant by the binder contained in the non-flammable non-woven fabric base material. Since flame retardant is supported, the flame retardant nonwoven fabric substrate has high flame retardancy. Moreover, even if an ink receiving layer is provided on a flame-retardant nonwoven fabric substrate, inkjet printing suitability is not hindered by bleeding of the flame retardant impregnated in the nonwoven fabric. For this reason, it is excellent in inkjet printing suitability, and it can be set as the flame-retardant nonwoven fabric for inkjet recording of the level which passes the flame-proof test defined by the Fire Service Act as the whole nonwoven fabric for flame-retardant inkjet recording.

It is a graph which shows the composition and compounding ratio of an Example and a comparative example. It is a graph which shows the evaluation result of an Example and a comparative example.

  Hereinafter, the present invention will be described, but the present invention is not construed as being limited to these embodiments.

  As described above, the non-woven fabric for flame-retardant inkjet recording according to the present invention has an object of satisfying the standards of the Fire Service Act in terms of flame-retardant performance or flame-proof performance.

Here, the Fire Service Act enforcement regulations are explained.
The following are typical examples of fire prevention target buildings that require the use of flameproof articles such as curtains and carpets that have flameproof performance under the Fire Service Law.
Article 8-3, Section 1 of the Fire Service Law High-rise buildings (buildings exceeding 31m), underground shopping mall Enforcement Ordinance for Fire Service Act Appendix 1 (1) A. Theater, movie theater, theater b. B ... Amusement park D ... Karaoke box etc. (3) I ... Waiting, restaurants, etc. B ... Restaurant (4) Department stores, markets, etc. (5) B ... Ryokan, hotels, etc. Nursing home for the elderly, etc. Nursing home for the elderly (9) B ... Steam bath, hot air bath, etc. among public baths (12) B ... Movie or TV studio

In addition, the flameproof articles described in Article 8-3, Paragraph 1 of the Fire Service Law include the following.
DESCRIPTION OF SYMBOLS 1 Curtain 2 Cloth blind 3 Dark curtain 4 Carpet etc. 5 Plywood for exhibition 6 Curtain used in the book and other stages 7 Plywood for large tools used in the stage 8 Construction sheet (mesh 12mm or less)

Further, typical combustion test methods used in the Fire Service Law include the following.
45 ° micro burner method, 45 ° Meckel burner method, 45 ° sagging method, 45 ° coil method, 45 ° air mix burner method

The nonwoven fabric for flame-retardant inkjet recording according to the present invention is provided with an ink receiving layer on at least one surface of a flame-retardant nonwoven substrate, and the flame-retardant nonwoven substrate is a fiber that has not been subjected to flame-retardant treatment. The non-woven fabric is impregnated with a flame retardant impregnating liquid, and the flame retardant impregnating liquid includes a liquid flame retardant and a binder, and the binder has a solid content with respect to 100 parts by mass of the flame retardant. It is contained in the range of 3 to 20 parts by mass in terms of conversion, and the ink receiving layer does not contain a flame retardant and a flame retardant binder, and is provided in the range of 6 to ²⁰ g / m ² per side in terms of solid content. The after flame time according to JIS L1091 A-1 method is 3 seconds or less, the residual time is 5 seconds or less, and the combustion area is 30 cm ² or less.

That is, when the non-woven fabric for flame retardant inkjet recording of the present invention is used for curtains, cloth blinds, construction sheets, etc., it corresponds to a material that flares with a thin cloth, and the mass of the article is 450 g / m ² or less. Therefore, it corresponds to the evaluation of the condition where the flame length is 45 mm and the heating time is 1 minute. In evaluating the flame retardancy in the present invention, the evaluation is performed by the JIS L1091 A-1 method in which test conditions and evaluation criteria are set in detail. This is the condition that category 3 (acceptance criteria) of the same standard is after flame time of 3 seconds or less, residual dust time of 5 seconds or less, and combustion area of 30 cm ² or less. This is because the flameproof standards that have been met are satisfied.

  In the present invention, as the nonwoven fabric used for the flame retardant nonwoven fabric base material, a nonwoven fabric made of fibers not subjected to flame retardant treatment is used. As the fiber constituting the nonwoven fabric, natural fibers such as wool and cotton, chemical fibers such as rayon and acetate, synthetic fibers such as polyolefin and polyester, and the like can be used. Among these, it is preferable to use a nonwoven fabric made of polyethylene fiber or polyester fiber from the viewpoint of strength and durability.

  As the flame retardant used in the flame retardant impregnation liquid in the present invention, a liquid flame retardant is preferable, but a solid flame retardant can also be used in combination with the liquid flame retardant. The flame retardant used here is not particularly limited, and a known flame retardant can be used. However, flame retardants composed of halogen compounds such as bromine and chlorine may generate harmful substances such as dioxins depending on the combustion conditions, so it is preferable to use non-halogen flame retardants.

  As the non-halogen flame retardant, commercially available inorganic flame retardants and organic flame retardants containing phosphorus and / or nitrogen can be used. These flame retardants include metal hydroxides such as magnesium hydroxide and aluminum hydroxide, metal oxides such as antimony trioxide, zirconium oxide and aluminum phosphite, boron compounds such as boric acid and zinc borate, Phosphorus compounds such as polyphosphoric acid, ammonium polyphosphate, amino group-modified phosphate esters, or hydroxyl group-containing phosphate esters, melamine or melamine cyanurate compounds, melamine derivatives such as melamine phosphate and melamine borate, guanidine or sulfamic acid Examples include phosphorus and / or nitrogen-containing compounds such as guanidine derivatives such as guanidine and guanidine phosphate. These non-halogen flame retardant compounds can be used alone or in combination of two or more.

  As the binder used in the flame retardant impregnation liquid in the present invention, water-soluble binders such as polyvinyl alcohol, modified polyvinyl alcohol, polyacrylamide, and polyethylene oxide, polyethylene, polypropylene, polyisobutylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, poly Vinyl acetate, melamine resin, epoxy resin, alkyd resin, unsaturated polyester resin, polyurethane resin, styrene-butadiene copolymer, modified styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, methyl methacrylate-butadiene copolymer , Acrylic ester-methacrylic ester copolymer, ethylene-vinyl acetate copolymer, vinyl acetate-maleic ester copolymer, vinyl acetate-acrylic copolymer, ethylene Vinyl acetate - can be used as the emulsion type binder or an emulsion type acrylic copolymer, but is not limited to these exemplified compounds. Among the above-mentioned ones, ethylene-vinyl acetate copolymer, polyurethane resin, and polyvinyl alcohol are preferable because bleeding and transition of the flame retardant can be further suppressed.

  The binder content in the flame retardant impregnating liquid is preferably 3 to 20 parts by mass, more preferably 5 to 15 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant. If the blending amount of the binder is less than 3 parts by mass, the amount of the liquid flame retardant oozes on the surface of the non-woven fabric for flame retardant inkjet recording and the ink receiving layer because the amount is not sufficient to suppress bleeding and transfer of the liquid flame retardant. Thus, there is a possibility that ink jet printing suitability is lowered, and there is a possibility that flame retardancy is lowered due to a decrease in the impregnation amount of the flame retardant due to the transfer of the liquid flame retardant. On the contrary, if the blending amount of the binder exceeds 20 parts by mass, the amount of the liquid flame retardant added may be relatively lowered, and the flame retardancy performance of the entire flame retardant inkjet recording nonwoven fabric may be deteriorated.

  In the present invention, a penetrant can be further added to the flame retardant impregnation liquid. By adding the penetrant, the flame retardant impregnating solution easily penetrates uniformly into the nonwoven fabric. Examples of penetrants include isopropyl alcohol, polyether-modified silicone, acetylene glycol, acetylene alcohol, acetylene diol, monoalkylammonium chloride, polyoxyalkylene branched decyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ether Polyoxyethylene lauryl ether, polyoxyalkylene alkyl ether, polyoxyethylene alkyl ether and the like can be used, but are not limited to these exemplified compounds. Of these, monoalkyl ammonium chloride, polyoxyalkylene branched decyl ether, polyoxyethylene polyoxypropylene alkyl ether, and polyoxyethylene alkyl ether are preferred because of their high compatibility with water.

  When the penetrant is added to the flame retardant impregnating liquid, the addition amount is preferably 0.5 to 10 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant, and is 1 to 3 parts by mass. More preferable. If the blending amount of the penetrant is less than 0.5 parts by mass, the penetrant is not sufficient for the effect to be effective. There is a possibility that it cannot be penetrated. On the other hand, when the blending amount of the penetrant exceeds 10 parts by mass, the effect due to the addition of the penetrant reaches its peak, and an effect corresponding to the amount used cannot be expected.

  Further, in the present invention, the flame retardant impregnating liquid impregnated into the nonwoven fabric is impregnated so that the flame retardant contained in the impregnating liquid is 15 parts by mass or more in terms of solid content with respect to 100 parts by mass of the nonwoven fabric, more preferably 18 parts by mass or more. When the impregnation amount of the flame retardant is less than 15 parts by mass, it is difficult to obtain the intended flame retardant performance, and it becomes difficult to satisfy the conditions of Category 3 in the Fire Service Act and JIS L1091 A-1 Method. Further, the upper limit of the amount of flame retardant impregnated into the nonwoven fabric is not particularly limited, but even if the amount of flame retardant impregnated exceeds 30 parts by mass with respect to 100 parts by mass of the nonwoven fabric, there is an effect corresponding to the amount used. Since it cannot be expected and is economically disadvantageous, it is desirable that the amount be 30 parts by mass or less. The impregnation amount of the flame retardant can be adjusted by appropriately changing the concentration and the impregnation amount of the flame retardant impregnation liquid according to the flame retardant concentration in the flame retardant impregnation liquid.

  In the present invention, the impregnation method of the flame retardant impregnation liquid into the nonwoven fabric is not particularly limited, and a known impregnation method can be used, and a size press coater or an impregnation coater can be used.

  As described above, in the flame retardant nonwoven fabric for inkjet recording of the present invention, an ink receiving layer is provided on at least one surface of the flame retardant nonwoven fabric substrate. The configuration of the ink receiving layer is not particularly limited, and a known ink receiving layer in the ink jet recording material can be used, but from the viewpoint of ensuring good ink jet recording suitability, it contains an inorganic pigment and a binder. It is preferable to provide an ink receiving layer.

  In the present invention, a flame retardant or a flame retardant binder is not contained in the ink receiving layer so as not to impair ink jet printing suitability. Examples of such a flame retardant include a flame retardant that can be contained in the flame retardant impregnating liquid exemplified above. Examples of the flame retardant binder include polyvinylidene chloride, polyvinyl chloride, polyvinyl acetate, polybutylene terephthalate, Examples include polycarbonate.

  The inorganic pigment used for the ink receiving layer is not particularly limited, and one or more known inorganic pigments used for the ink receiving layer for ink jet printing can be selected and used. Examples of such inorganic pigments include synthetic amorphous silica, calcined clay, colloidal silica, colloidal alumina, pseudoboehmite, alumina, lithopone, hydrous halloysite, magnesium carbonate, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, Examples thereof include white inorganic pigments such as light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, and satin white. When attention is paid to ink absorbability, it is preferable to use synthetic silica from the viewpoint of high ink absorbability. In addition, a small amount of an organic pigment can be used as long as the object of the present invention is not impaired.

  In the present invention, the binder used for the ink receiving layer is not particularly limited, and a known binder used for the ink receiving layer for ink jet printing can be used. Examples of such binders include cellulose derivatives such as polyvinyl alcohol, modified polyvinyl alcohol, hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, polyethylene oxide, polypropylene oxide, starch, modified starch, polyacrylic acid, sodium polyacrylate, and alginic acid. Water-soluble binders such as soda, polystyrene sulfonate soda, casein, gelatin, terpene, polyethylene, polypropylene, polyisobutylene, polystyrene, polyacrylamide, polyethyl acrylate, polymethyl methacrylate, polyacrylonitrile, polytetrafluoroethylene, polybutadiene, Polyisoprene, polychloroprene, nylon, polyethylene terephthalate, polyaceter , Polybischloromethyloxacyclobutane, poly-p-xylylene, polyimide, polybenzimidazole, melamine resin, epoxy resin, alkyd resin, unsaturated polyester resin, diallyl phthalate resin, styrene-butadiene copolymer, modified styrene-butadiene copolymer It is an emulsion type binder or emulsion type such as polymer, ethylene-vinyl acetate-acrylic copolymer, acrylonitrile-butadiene copolymer, methyl methacrylate-butadiene copolymer, acrylic ester-methacrylic ester copolymer. A urethane resin binder or the like can be used. Among these binders, polyvinyl alcohol is preferable from the viewpoints of ink jet printing suitability and operability. The polymerization degree, saponification degree, Tg (glass transition temperature), MFT (minimum film forming temperature), etc. of these binders are not limited, and a crosslinkable functional group is added to these molecular chains. It doesn't matter.

  In the present invention, an ink fixing agent containing a cationic polymer as a main component may be contained in the ink receiving layer in order to improve the fixing property and color development property of the ink. Examples of such an ink fixing agent include polyethyleneimine, epichlorohydrin-modified polyalkylamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, polyvinylpyridium. Halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide diethylenetriamine polycondensation , Polyallylamine Use polyallylamine hydrochloride, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation-modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, other quaternary ammonium salts, polyamine, etc. It is possible.

  In the coating liquid for forming the ink-receiving layer, paper-making additives other than the inorganic pigment and the binder described above can be used as needed as long as the object of the present invention is not impaired. Examples of such papermaking additives include dispersants, antifoaming agents, pH adjusting agents, wetting agents, water retention agents, thickeners, crosslinking agents, mold release agents, preservatives, softening agents, waxes, anti-conductive agents, Examples thereof include an antistatic agent, a sizing agent, a water resistant agent, a plasticizer, a fluorescent brightening agent, a coloring dye, a reducing agent, an ultraviolet absorber, an antioxidant, a fragrance, and a deodorizing agent.

In the present invention, the ink receiving layer is provided with a single layer or two or more layers on at least one surface of the flame-retardant nonwoven fabric substrate. The coating amount of the ink receiving layer is in the range of 6 to ²⁰ g / m ^{2 in} terms of solid content per side, preferably 10 to 15 g / m ² . When the coating amount of the ink receiving layer is less than 6 g / m ² , the coating amount is too small, so that the ink receiving layer cannot uniformly cover the entire surface of the flame retardant nonwoven fabric substrate. Since the thickness itself is not sufficient, there is a possibility that sufficient ink jet printing suitability may not be obtained such as printing bleeding and printing unevenness. On the contrary, when the coating amount of the ink receiving layer exceeds 20 g / m ² , the improvement in printability is not seen, which is not preferable in terms of productivity and cost, and in addition, the ink receiving layer to which flame retardancy is not imparted. There is a possibility that the flame retardancy performance of the entire flame retardant inkjet recording nonwoven fabric may be deteriorated by increasing the ratio.

  In the present invention, when the ink receiving layer is provided on the flame-retardant nonwoven fabric substrate, the application method of these coating liquids is not particularly limited, and a known application method can be used. For example, using an ink receiving layer or a coater selected from a kiss coater, blade coater, air knife coater, roll coater, reverse roll coater, bar coater, rod blade coater, short dwell coater, curtain coater, die coater, gravure coater, Champlex coater, etc. Each flame retardant coating layer can be applied in a single layer or multiple layers. An air knife coater, a curtain coater, and a rod coater are preferable from the viewpoint of the liquidity of the coating solution, and an air knife coater is more preferable. In the present application, the solid content concentration and the like of the coating liquid for the ink receiving layer are not limited, but the solid content concentration is preferably in the range of about 10 to 25 from the viewpoint of coating performance.

  Further, the drying method of the coating liquid for forming the ink receiving layer is not particularly limited, and hot air drying, infrared drying, room temperature drying, freeze drying, etc. can be used. Drying and hot air drying are preferred.

  EXAMPLES Examples of the flame retardant inkjet recording nonwoven fabric according to the present invention will be specifically described below, but the present invention is not limited to these examples. In the examples, “parts” and “%” indicate “parts by mass” and “% by mass” in dry solids unless otherwise specified.

Example 1
<Production of flame retardant nonwoven fabric substrate>
100 parts of a halogen-free flame retardant containing a phosphorus compound as a liquid flame retardant (trade name: Flamguard SP-10Y, 90% concentration liquid, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) is added to water, and ethylene-vinyl acetate as a binder is further added. -Based copolymer (trade name: Sumikaflex 755, 51% concentration product, manufactured by Sumitomo Chemical Co., Ltd.), polyoxyethylene polyoxypropylene alkyl ether (trade name: Emulgen MS110, 100% concentration product, Kao) as penetrant 2 parts) was added and stirred to obtain a flame retardant impregnating solution having a solid concentration of 35%. The obtained flame-retardant impregnating solution is impregnated with a non-flammable nonwoven fabric (trade name: Tyvek 1073D, basis weight 75 g / m ² , manufactured by Asahi DuPont) with an impregnation coater. An amount of 19 parts by mass in terms of solid content was impregnated with 100 parts by mass of the nonwoven to obtain a flame retardant nonwoven fabric substrate.
<Preparation of coating solution for ink receiving layer>
Amorphous silica (trade name: 74 × 5500, average particle size 8 μm, pore volume 1.2 ml / g, oil absorption 180-220 ml / 100 g, manufactured by Grace Devison) and amorphous silica (trade name: 30 parts of P-412, average particle size of 12 μm, pore volume of 2.0 ml / g, oil absorption of 300 to 330 ml / 100 g, manufactured by Grace Devison Co., Ltd.) are added to water, and the solid content concentration is 27.5 using a cowless disperser. % Pigment slurry was prepared. Polyvinyl alcohol (trade name: EXEVAL RS2117, 11.5% solution, manufactured by Kuraray Co., Ltd.) 30 parts, ethylene vinyl acetate copolymer (trade names: Polysol AD-13-50, 50) as a binder in the obtained pigment slurry. % Concentration product, Showa Polymer Co., Ltd.) 20 parts, cationic resin (trade name: Unisense CP-103, 40% concentration product, manufactured by Senka) as a fixing agent for inkjet ink, acetic acid as binder water resistance agent Add 10 parts of zirconyl (trade name: Zircozol ZA-30, 30% concentration product, manufactured by Daiichi Rare Element Co., Ltd.) and stir, and then add water and stir to obtain an ink having a solid concentration of 17.5%. A receiving layer coating solution was obtained.
<Preparation of flame-retardant inkjet recording nonwoven fabric>
The ink receiving layer coating solution is applied to one surface of the flame retardant nonwoven fabric substrate with an air knife coater so that the coating amount becomes 12.0 g / m ^{2 in} terms of solid content, and then dried with hot air using an air dryer. To obtain a target flame retardant nonwoven fabric for inkjet recording.

(Example 2)
A nonwoven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 1, except that the coating amount of the coating liquid for ink-receiving layer was 6.0 g / m ² .

(Example 3)
In Example 1, the flame retardant impregnation liquid was impregnated so that the flame retardant impregnation amount was 16 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric, and the coating amount of the ink receiving layer coating liquid was 20. A non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 1 except that the coating was applied at 0 g / m ² .

Example 4
In Example 1, the blending amount of the binder in the flame retardant impregnating liquid is 3 parts, and the flame retardant impregnating liquid has an impregnating amount of the flame retardant of 16 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric. A non-woven fabric for flame retardant ink jet recording was obtained in the same manner as in Example 1 except that the above was impregnated.

(Example 5)
In Example 1, the blending amount of the binder in the flame retardant impregnating solution was changed to 15 parts, and the penetrant was changed to polyoxyethylene alkyl ether (trade name: Emulgen 707, 100% concentration product, manufactured by Kao Corporation). The flame impregnating liquid is impregnated so that the flame retardant impregnation amount is 18 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric, and the coating amount of the ink receiving layer coating liquid is 10.0 g / m ^2. A non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 1 except that the coating was performed as described above.

(Example 6)
In Example 5, the blending amount of the binder in the flame retardant impregnating liquid is 10 parts, and the flame retardant impregnating liquid is impregnated with the flame retardant of 20 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric. A non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 5 except that the ink receiving layer was impregnated and applied so that the coating amount of the ink receiving layer coating solution was 12.0 g / m ² .

(Example 7)
In Example 5, the blending amount of the binder in the flame retardant impregnating liquid is 20 parts, and the flame retardant impregnating liquid is impregnated with the flame retardant of 20 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric. A non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 5 except that the ink receiving layer was impregnated and applied so that the coating amount of the ink receiving layer coating solution was 10.0 g / m ² .

(Example 8)
In Example 6, the binder in the flame retardant impregnating solution was changed to polyurethane resin (trade name: Hydran WLI-602, 40% concentration product, manufactured by Dainippon Ink and Chemicals), and the penetrant was monoalkylammonium chloride (product) A non-woven fabric for flame-retardant inkjet recording was obtained in the same manner as in Example 6 except that the name was changed to ARCARD 16-29, 29% concentration product, manufactured by Lion Corporation.

Example 9
In Example 6, except that the binder in the flame retardant impregnation liquid was changed to polyvinyl alcohol (trade name: PVA117, 10% solution, manufactured by Kuraray Co., Ltd.), in the same manner as in Example 6, the nonwoven fabric for flame retardant inkjet recording Got.

(Example 10)
In Example 6, the binder in the flame retardant impregnation liquid was changed to a styrene-butadiene copolymer (trade name: L-1432, 48% concentration product, manufactured by Asahi Kasei Chemicals Co., Ltd.). A nonwoven fabric for flame retardant inkjet recording was obtained.

(Comparative Example 1)
In Example 6, a non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 6 except that the blending amount of the binder in the flame retardant impregnation liquid was 1 part.

(Comparative Example 2)
In Example 6, a non-woven fabric for flame retardant inkjet recording was obtained in the same manner as in Example 6 except that the blending amount of the binder in the flame retardant impregnation liquid was changed to 2 parts.

(Comparative Example 3)
Example 6 is the same as Example 6 except that the amount of the binder in the flame-retardant impregnating solution is 30 parts and the amount of the ink-receiving layer coating solution is 10.0 g / m ^2. Thus, a nonwoven fabric for flame-retardant inkjet recording was obtained.

(Comparative Example 4)
In Example 1, the flame-retardant inkjet was carried out in the same manner as in Example 1 except that the flame-retardant impregnating liquid was impregnated so that the impregnation amount of the flame retardant was 11 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric. A nonwoven fabric for recording was obtained.

(Comparative Example 5)
A nonwoven fabric for flame-retardant inkjet recording was obtained in the same manner as in Example 1, except that the coating amount of the coating liquid for the ink receiving layer was 25.0 g / m ² .

(Comparative Example 6)
In Example 1, the nonwoven fabric for flame-retardant inkjet recording was obtained like Example 1 except having apply | coated so that the application quantity of the coating liquid for ink receiving layers might be set to 5.0 g / m < ² >.

(Comparative Example 7)
In Example 9, a flame-retardant ink jet was used in the same manner as in Example 9 except that the flame-retardant impregnating liquid was impregnated so that the amount of impregnation of the flame retardant was 13 parts by mass in terms of solid content with respect to 100 parts by mass of the nonwoven fabric. A nonwoven fabric for recording was obtained.

(Comparative Example 8)
In Example 9, a non-woven fabric for flame-retardant inkjet recording was obtained in the same manner as in Example 9 except that the coating amount of the ink receiving layer coating solution was 23.0 g / m ² .

(Comparative Example 9)
In Example 9, the nonwoven fabric for flame-retardant inkjet recording was obtained like Example 9 except having apply | coated so that the application quantity of the coating liquid for ink receiving layers might be set to 4.0 g / m < ² >.

<Evaluation of physical properties of flame retardant inkjet recording nonwoven fabric>
About the nonwoven fabric for flame-retardant inkjet recording obtained in Examples 1-10 and Comparative Examples 1-8, the composition and compounding ratio of Examples and Comparative Examples are shown in FIG. 1, and the evaluation results are shown in FIG. Yes. The evaluation of flame retardancy, bleeding, transition and ink jet printing suitability shown in FIG. 2 was performed by the following method after humidity adjustment under the condition of 23 ° C. × 50% RH.

<Flame retardance evaluation (flammability test method)>
In accordance with JIS L1091 A-1 method (45 ° micro burner method) which is a method for testing the flammability of textile products, the following conditions are applied to the non-woven fabric for flame-retardant inkjet recording obtained in each of Examples and Comparative Examples. The test was conducted.
Test conditions: heating time 60 seconds, post-flame heating time 3 seconds Evaluation direction: front (vertical, horizontal), back (vertical, horizontal)
Evaluation criteria: ○ No flame. Even if it flames, the following standards must not be exceeded.
(After-flame time 3 seconds or less, afterglow time of 5 seconds or less, carbonized area 30 cm ² or less)
× Flames and spreads.

<Bleeding evaluation>
Using an ink jet printer EPSON PX G5300, after printing an arbitrary design on the surface having the ink receiving layer of the non-woven fabric for flame retardant ink jet recording obtained in each of the examples and comparative examples, conditions of 50 ° C. and 70% RH And the printed surface was visually evaluated.
◎ No change on printed surface.
○ There is almost no change on the printed surface.
△ Some unevenness and bleeding occur on the printed surface.
× Unevenness and blurring occur on the entire printing surface.

<Evaluation of metastasis>
The flame retardant which was transferred to the non-coated paper after the flame retardant inkjet recording nonwoven fabric obtained in each Example and Comparative Example was sandwiched between non-coated paper such as high-quality paper, a weight was placed on the top and stored at room temperature for 1 week The exudation of was visually evaluated.
○ Flame retardant does not soak into the sandwiched paper and has an effect of suppressing the transfer of the flame retardant.
X Flame retardant soaking occurred in the sandwiched paper, and there was no effect of suppressing the transfer of the flame retardant.

<Inkjet printing aptitude>
Using an ink jet printer EPSON PX G5300, an arbitrary design was printed on the surface having the ink receiving layer of the non-woven fabric for flame retardant ink jet recording obtained in each Example and Comparative Example, and the print bleeding and unevenness were visually evaluated.
○ There is no printing blur and unevenness, and it passes.
X Printing blur and / or unevenness was remarkable, unacceptable for practical use, and rejected.

  As is clear from the results shown in FIG. 2, the flame-retardant nonwoven fabric for inkjet recording obtained in Examples 1 to 10 has good printability by an inkjet printer without causing bleeding and transfer of the flame retardant. is there.

  Moreover, all the nonwoven fabrics for flame-retardant inkjet recording obtained by Examples 1-10 satisfy the conditions of Category 3 according to JIS L1091 A-1 method, and these all pass the flameproof test defined by the Fire Service Act. It can be said that it has a level of flame retardancy. That is, the flame retardant inkjet recording nonwoven fabrics obtained in Examples 1 to 10 both have both flame retardancy and inkjet printability.

  In contrast, the flame retardant nonwoven fabric for inkjet recording obtained in Comparative Examples 1 and 2 has a small amount of binder in the flame retardant impregnating solution, so that the bleeding of the flame retardant is not sufficiently suppressed. Printability is low.

  Moreover, the nonwoven fabric for flame-retardant inkjet recording obtained by Comparative Examples 3, 4, 5, 7, and 8 is inferior to that of Examples 1 to 10 in terms of flame retardancy, according to JIS L1091 A-1 method. The condition of Category 3 was not satisfied. This is because the blending ratio of the binder is high in the flame-retardant impregnating solution, so that the blending ratio of the flame retardant is relatively lowered and the flame retardancy of the entire flame-retardant nonwoven fabric is decreased (Comparative Example 3). It is thought that this is caused by a small amount of impregnation (Comparative Examples 4 and 7), a large amount of ink-receiving layer applied, and a low flame retardancy of the entire flame-retardant nonwoven fabric (Comparative Examples 5 and 8). It is done.

  Furthermore, in Comparative Examples 6 and 9, since the coating amount of the ink receiving layer was small, the ink jet printing suitability was inferior.

  As described above, the non-woven fabric for flame retardant inkjet recording of the present invention has excellent ink jet printing suitability, suppressing flame retardant and bleeding and transfer of the flame retardant. It can be suitably used for interior materials such as banners and wallpaper, posters, and the like.

Claims (8)

An ink receiving layer is provided on at least one surface of the flame-retardant nonwoven fabric substrate,
The flame retardant nonwoven fabric base material is obtained by impregnating a flame retardant impregnating liquid into a nonwoven fabric made of fibers not subjected to flame retardant treatment,
The flame retardant impregnation liquid contains a liquid flame retardant and a binder, and is impregnated so that the flame retardant is included in an amount of 15 to 30 parts by mass with respect to 100 parts by mass of the nonwoven fabric.
The binder is included in a range of 3 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant,
The ink receiving layer does not include a flame retardant , polyvinylidene chloride, polyvinyl chloride, polyvinyl acetate, polybutylene terephthalate, and polycarbonate, and is provided in a range of 6 to ²⁰ g / m ² per side in terms of solid content.
A non-woven fabric for flame-retardant inkjet recording, characterized in that the after flame time according to JIS L1091 A-1 method is 3 seconds or less, the residual time is 5 seconds or less, and the combustion area is 30 cm ² or less.   2. The binder according to claim 1, wherein the binder contained in the flame retardant impregnation liquid is one or more selected from ethylene-vinyl acetate copolymer, polyurethane resin, and polyvinyl alcohol. Non-woven fabric for flame retardant inkjet recording.   The flame retardant impregnation liquid contains a penetrant, and the penetrant is contained in a range of 0.5 to 10 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant. The non-woven fabric for flame-retardant inkjet recording according to claim 1.   The flame retardant inkjet recording nonwoven fabric according to claim 1, wherein the liquid flame retardant is a non-halogen flame retardant and contains a phosphorus compound or a phosphorus organic compound.   The said nonwoven fabric consists of a polyethylene fiber or a polyester fiber, The nonwoven fabric for flame-retardant inkjet recording of Claim 1 characterized by the above-mentioned.   The penetrant contained in the flame retardant impregnation liquid is one or two selected from monoalkyl ammonium chloride, polyoxyalkylene branched decyl ether, polyoxyethylene polyoxypropylene alkyl ether, and polyoxyethylene alkyl ether. It is the above, The nonwoven fabric for flame-retardant inkjet recording of Claim 3 characterized by the above-mentioned.   The non-woven fabric for flame retardant inkjet recording according to claim 1, wherein the flame retardant impregnating liquid further contains a solid flame retardant. A flame retardant impregnating liquid preparation step of preparing a flame retardant impregnating liquid using a flame retardant and a binder of 3 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the flame retardant;
A flame retardant nonwoven fabric substrate production step for making a flame retardant nonwoven fabric substrate by impregnating the flame retardant impregnating solution so that a flame retardant is contained in an amount of 15 to 30 parts by mass with respect to 100 parts by mass of the nonwoven fabric;
An ink receiving layer coating solution preparation step of preparing an ink receiving layer coating solution using an inorganic compound, a binder, and water;
An ink receiving layer in which the ink receiving layer is applied to at least one surface of the flame retardant nonwoven fabric base, and an ink receiving layer is provided so as to be in a range of 6 to ²⁰ g / m ^{2 in} terms of solid content per side. An application step,
The flame retardant includes at least a liquid flame retardant,
The ink receiving layer coating liquid does not include a flame retardant , polyvinylidene chloride, polyvinyl chloride, polyvinyl acetate, polybutylene terephthalate, and polycarbonate,
Thereby, a non-woven fabric for flame-retardant inkjet recording having a residual flame time of 3 seconds or less according to JIS L1091 A-1 method, a residual dust time of 5 seconds or less, and a combustion area of 30 cm ² or less is produced. A method for producing a nonwoven fabric for flame-retardant inkjet recording.

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