KR100925692B1 - The flame retardant plastic film for ink-jet printer - Google Patents

Abstract

PURPOSE: A flame-resistant plastic film for ink-jet printers and a preparation method thereof are provided to eliminate a crack phenomenon in a drying process using a flame-resistant layer and ink-absorbing layer. CONSTITUTION: A flame-resistant plastic film for ink-jet printers comprises a base layer(10), ink-absorbing layer(30), and a flameproof layer(20). The flameproof layer is formed between the base layer and ink-absorbing layer. A composition of the flameproof layer comprises at least one resin, flameproofing agent, solvent, curing agent, leveling agent, and antifoaming agent. The resin is polyurethane or polyvinyl chloride. The flameproofing agent is selected from the group consisting of bromine-based, antimony-based, phosphorus-based flameproofing agent, aluminium hydroxide, inorganic flameproofing agent, and their mixture. The solvent is MEK, toluene, acetone, DMF, methanol, and their mixture. The curing agent is selected from isocyanate-based, epoxy-based, and melamine-based curing agent. The leveling agent is a silicone-based leveling agent or polymer leveling agent. The antifoaming agent is a silicone-based antifoaming agent or non-silicone-based antifoaming agent.

Description

Flame retardant plastic film for inkjet printing and manufacturing method thereof {The flame retardant plastic film for ink-jet printer}

The present invention relates to a flame retardant plastic film that can be output from an inkjet printer and a method of manufacturing the same.

An ink jet printer is a type of ink jet printer in which ink is ejected through a nozzle of a cartridge to form fine ink spots to match a shape of a character, a figure, an image, or the like to be printed on a printing paper.

Recently, due to the technical improvement of the inkjet printer, the size of the printing paper is also increased, and the quality of the printed matter is rapidly improved, such that the printed matter has various colors and excellent color development and precision.

When outputting using such an inkjet printer, in order to obtain a high quality print, it is important to have an excellent fixation rate without spreading the liquid ink in the process of being sprayed onto the printing paper.

Recently, due to the technical development of the inkjet printer as described above, a variety of indoor and outdoor printed matters such as banners are produced using an inkjet printer, and such papers are mainly used for textile paper.

In the case of using the woven paper as described above, the pretreatment solution (mainly silica) is coated on the surface of the fabric (or fabric), thereby increasing the fixing rate of the ink and improving the color development. For example, Korean Patent No. 764934 And Patent No. 801169.

Meanwhile, in the case of the inkjet output fabric used for indoor use as described above, flame retardancy is recently required. In order to improve this, the present applicant has layered a flame retardant layer and an ink absorbing layer on a fabric substrate in Korean Patent No. 769881. It has been proposed a fabric for inkjet printing having a flame retardant characteristics formed by the structure.

In addition, a number of printing fabric manufacturing techniques have been disclosed in which a flame retardant is mixed with an ink receptive layer and coated on a fabric. When the crack (crack) is generated and there is a disadvantage that the color development is reduced, when the flame retardant is mixed in a small amount has a disadvantage that the flame resistance is reduced.

In addition, although the flame retardant was sprayed after the actual printing on the surface of the inkjet printing material, the above method cannot expect a definite flame retardant effect. There was a disadvantage that can not be used for a long time.

In addition, the ink-jet printing materials having the flame-retardant properties described above are all limited to fabrics, and the fabrics have limitations in strength and durability due to their characteristics.

Accordingly, a technology of using a plastic film having a long lifespan as compared to a fabric has been developed, but a flame retardant treatment has not been developed.

Moreover, when the substrate is changed from fabric to plastic film, even if it is roughly coated on the fabric, there is no problem in the product. However, plastic film is used to determine the product quality due to the leveling property of the coating liquid, bubbles, and adhesion between the substrate and the coating layer. It is a very important factor.

In addition, the fabric absorbs a part of the coating liquid, so there is no problem in durability, adhesion to the substrate, or ink resistance. However, the plastic film lacks adhesion to the substrate and ink resistance because the entire coating liquid is coated on the film.

The present invention is to solve the above problems, by applying a mixture containing a flame retardant and a resin in a layered structure on a substrate formed of a plastic film, it is possible to record an ink image with excellent flame resistance and clarity and fast ink drying speed An object of the present invention is to provide a flame retardant plastic film for inkjet printing and a method of manufacturing the same.

In addition, the present invention has an object to improve the leveling properties of the coating liquid, bubbles, and adhesion between the substrate and the coating layer, which is a problem when using a plastic film using a leveling agent and an antifoaming agent, when the leveling agent is not added. If the leveling property is lowered, a wavy pattern is generated, and if the leveling agent is added in excess, the printability is insufficient. If the antifoaming agent is not added, the pinhole phenomenon occurs. Therefore, how to select the appropriate amount of these additives that are not necessary in the fabric is very important in using the plastic film, it is aimed to present the addition amount of these additives to the optimum level.

In addition, the fabric absorbs a part of the coating liquid, so there is no problem in durability, adhesion to the substrate, or ink resistance, but the plastic film lacks adhesion to the substrate and ink resistance because the entire coating liquid is coated on the film. It is an object of the present invention to provide a flame retardant plastic film for inkjet printing using a crosslinking agent or a curing agent and a method of manufacturing the same.

Features of the present invention for achieving the above object, one or all selected from a base layer made of a plastic film, an ink absorbing layer formed on the upper surface of the base layer, between the base layer and the ink absorbing layer or the bottom surface of the base layer It is in the flameproof plastic film for inkjet outputs which consists of a flameproof layer formed in the.

In addition, an inkjet comprising a base layer made of the plastic film, an anti-flame layer formed on the bottom of the base layer, an adhesive layer formed on the bottom of the anti-flame layer, and an ink absorbing layer formed on an upper surface of the base layer. There are other features of the flame retardant plastic film for printing.

On the other hand, when the ink absorbing layer is located directly on the base layer, that is, when the flame-retardant layer is formed on the bottom surface of the base layer, one of the primer layer or the corona layer so that the ink is fixed to the upper surface of the base layer can be absorbed The primer is used to increase the adhesion between the plastic base layer and the ink absorbing layer, and the corona improves the surface uniformity and artificially increases the surface tension of the plastic base layer to further increase the adhesion to the ink receiving layer. To increase.

The ink absorbing layer is formed of a single film on the upper surface of the plastic substrate layer by mixing an ink fixing layer and an ink absorbing layer to fix and absorb ink.

5-40 micrometers is suitable for the dry film thickness of the said flameproof layer.

In addition, although the ink absorbency tends to increase as the coating amount of the ink absorbing layer increases, the ink absorbance no longer improves when a certain coating amount is reached. Therefore, the coating amount of the ink receiving layer is suitable about 100 ~ 200g / m ³ , the general thickness is preferably about 5 ~ 40㎛, more preferably 25 ~ 35㎛.

In addition, in the method for manufacturing a flame retardant plastic film according to the present invention, an ink absorption layer is comma-coated on an upper surface of the base layer made of the plastic film, and a flame retardant layer is selected between one or both of the base layer and the ink absorption layer or the bottom of the base layer. Is formed by comma coating.

In another method for manufacturing a flameproof plastic film of the present invention, a flameproof layer formed on a bottom surface of a base layer made of a plastic film is comma coated, an adhesive layer is formed on the bottom surface of the above flameproof layer, and an upper surface of the base layer is formed. The ink absorbing layer to be formed is formed by comma coating, wherein the pressure-sensitive adhesive layer uses a transfer method using a release paper or a method of directly applying.

On the other hand, when the ink absorbing layer is directly formed on the base layer in the above, by applying a primer or corona treatment on the base layer to enhance the adhesion between the ink absorbing layer and the base layer.

In the above configuration, the substrate layer is formed of a film made of polyester (PET), polypropylene (PP), or polyvinyl chloride (PVC).

The flame retardant composition forming the flame retardant layer comprises 20-40% by weight of at least one resin selected from polyurethane or polyvinyl chloride, 25-60% by weight of flame retardant, 15-40% by weight of solvent and hardener 0.1-10 based on the total weight of the flame retardant composition. % By weight, 0.1-5% by weight leveling agent, 0.1-5% by weight antifoaming agent.

The ink absorbing layer composition forming the ink absorbing layer is 25-70% by weight of a hydrophilic binder containing polyvinyl alcohol, 7-15% by weight of silica, 3-10% by weight of a dye fixing agent, and distilled water, based on the total weight of the ink absorbing layer composition. 15-60% by weight, additives 1-5% by weight, the additive may be selected from one or more of crosslinking agents, fluorescent dyes, pH adjusting agents, antioxidants, antifoaming agents, leveling agents, lubricants, anti-curling agents, surfactants, curing agents use.

Flame retardant in the above-described configuration may be used for inorganic flame retardants such as bromine, antimony, phosphorus, aluminum hydroxide, magnesium hydroxide, Zinc Borate, these may be used alone or in combination, for example, Decabromodiphenyloxide, Decabromodiphenylethane, Antimony trioxide, Antimony pentoxide, Aluminum hydroxide, Hexabromocyclododecane, Urea, Borax (Na2B4O7).

Solvent is used alone or mixed with MEK (Methyl Ethyl Ketone), toluene, acetone, DMF (dimethylformamide), methanol, etc., and the curing agent used in the flameproof layer is an isocyanate curing agent, epoxy curing agent, melamine curing agent selectively Can be.

In addition, the leveling agent may selectively use a silicone-based leveling agent and a polymer-based leveling agent, and when used at less than 0.1% by weight, the leveling property is lowered, and when used at 5% by weight or more, it causes a decrease in adhesion.

Antifoaming agent can be selectively used silicone antifoaming agent and non-silicone antifoaming agent, when less than 0.1 parts by weight of the defoaming effect is insufficient, the surface roughness phenomenon caused by bubbles, and when used more than 5 parts by weight causes adhesion deterioration Becomes

In addition, the hydrophilic binder forming the ink absorbing layer is formed on the hydrophobic plastic base layer, so that the ink absorbing layer made of a hydrophilic material is formed so that the plastic base layer can easily absorb the ink and uses polyvinyl alcohol (PVA), The polyvinyl alcohol described above is excellent in ink absorption, clarity (bleeding), and cracking property of an ink having a saponification degree of 88% and a polymerization degree of 1700.

Silica can use two or more kinds of different particle sizes to realize crack prevention and excellent color density of the coating surface.

The dye fixing agent is used for the purpose of catching particles of anionic ink and improving water resistance. Dye fixing agents include cationic substances such as dicyandiamide, ethylenediamine, diethylenetriamine, or secondary arylamine derivatives with copolymers of allylamine, diallylamine, dimethyldiallylammonium chloride or polydiallyldimethylammonium. Compounds can be used alone or in combination selected from polyacrylates, polyacrylamides, copolymers of polyvinylpyrrolidone, dimethylamine-epichlorohydrin condensates, acrylamide-diallylamine copolymers, and polyvinylamine polymers. have.

The curing agent used in the ink absorbing layer is added to improve the water resistance of polyvinyl alcohol and polyurethane, and there are glyoxal, organo titanium compound, organo zirconium compound, magnesium sulfate, etc., which can be used alone or in a mixture. Weight percent can be used.

According to the present invention, the anti-flame layer is formed on the surface of the plastic substrate layer and the ink absorption layer is coated on the plastic substrate layer on the back surface thereof, thereby eliminating the cracking phenomenon occurring in ink drying and significantly reducing the curling phenomenon of the film. This has the effect of being excellent in flame retardancy and clarity, eliminating color shift and having excellent flame retardancy with excellent ink absorption.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing the configuration of a flame retardant plastic film for inkjet output according to the present invention, such that the base layer 10, the flame retardant layer 20, and the ink absorbing layer 30 are formed from the bottom as shown in (a), or (b ), The flame retardant layer 20, the flame retardant layer 20, and the ink absorbing layer 30 in this order, or the adhesive layer 40, the flame retardant layer 20, and the base layer as shown in (c). (10), primer or corona layer 50, ink absorbing layer 30 in order, or as (d) pressure-sensitive adhesive layer 40, flame-resistant layer 20, base layer 10, ink absorbing layer 30 ) Or the flame retardant layer 20, the base material layer 10, and the ink absorbing layer 30, as shown in (e).

And it looks at the flame-proof plastic film manufacturing method for inkjet output of the present invention.

A composition having the weight ratios of Tables 1 and 2 below was prepared on a corona-treated polypropylene film (also known as synthetic paper or diffuser paper) having a thickness of 80 μm. The ink absorbing layer is coated to have a dry coating thickness of about 35 μm, and then dried in an oven (110 ° C., 3 minutes) to form an ink absorbing layer, and the anti-flame layer is coated to have a dry coating thickness of 25 μm on the opposite side, and then the oven (110). It dried at (degree. C., 3 minutes), and prepared the flameproof film for inkjet output. In Table 2, silica 1 has a larger particle size than silica 2.

matter Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PU resin 25 * 25 25 25 12.5 12.5 25 PVC resin 10 10 * 10 10 5 * * Acrylic copolymer * 25 10 * * * 5 10 DBDPO 24 24 24 * 12 24 * 36 Sb2O3 12 12 12 * 6 12 * 18 Al (OH) 3 4 4 4 * 2 4 * * Mg (OH) 2 * * * * * * * * Phophate * * * 40 * * 40 *

matter Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 H2O 18 18 18 18 18 58 18 23 PVA (10%) 60 60 60 60 60 20 60 60 Silica 1 4 4 4 4 10 4 8 2 Silica 2 6 6 6 6 * 6 12 3 Crosslinking agent 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Dye Fixing Agent 10 10 10 10 10 10 10 10 pH regulator 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Fluorescent dyes 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Antifoam 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2

In Tables 1 and 2 the units are weight percent.

Table 1 is a flame retardant layer composition, Table 1 above shows only the amount of the resin and the flame retardant, and in addition to the solvent and curing agent, leveling agent and antifoaming agent fixed with a curing agent 5, leveling agent 1, antifoaming agent 1 and remaining 100 weight The shorter portion of% added the solvent.

Evaluation results for the ink absorption power, the sharpness (color bleeding), light resistance, and ink crackability of the ink for the ink-jet printing flame retardant film according to Examples 1, 2, 3, 4 and Comparative 1, 2, 3, 4 are shown in Table 3. Is the same as Image printing was done using a large plotter (Rolland FJ-740K).

(1) ink absorption

After taking the normalized image on the film for inkjet printer according to the embodiment of the present invention of A4 size, the white paper was piled up, and 5 kg of iron was put on for 10 seconds and then evaluated by checking the degree of ink buried in the white paper.

○: Not buried.

×: buried.

(2) Sharpness (smearing) of color image

After taking a normalized image on the film for an ink jet printer according to the embodiment of the present invention of A4 size, it was evaluated by checking the degree of smear of the image after standing for 48 hours in a constant temperature and humidity chamber at 40 ° C and 80% relative humidity.

(Circle): Smearing phenomenon is not observed.

(Triangle | delta): Although a little bleeding occurs, there is no problem in actual use.

X: Smearing occurs and there is a problem in actual use.

(3) surface cracking

A4 size was evaluated by visual observation of the coating surface according to the embodiment of the present invention.

○: No cracking phenomenon.

(Triangle | delta): Although a little cracking phenomenon arises, there is no problem in actual use.

X: A crack phenomenon occurs and there is a problem in actual use.

(4) Flame retardant

A flame retardant film for an ink jet printer according to an embodiment of the present invention in A4 size was evaluated by a 45 degree combustion tester.

○: good flame retardancy

×: Flameproof poor

Ink absorption Smearing Surface crackability Flameproof Example 1 ○ ○ ○ ○ Example 2 ○ ○ ○ ○ Example 3 ○ ○ ○ ○ Example 4 ○ ○ ○ ○ Comparative Example 1 ○ △ ○ × Comparative Example 2 ○ ○ × ○ Comparative Example 3 ○ ○ × ○ Comparative Example 4 × × × ○

As shown in Table 3, the flame retardant film for inkjet output having the ink receiving layer having the composition according to the present invention was found to be excellent in ink absorption, sharpness, cracking, and flame retardancy.

1 is a cross-sectional view showing a plastic film according to the present invention

Claims (7)

A base layer made of a plastic film, 5 to 40 μm thick ink absorbing layer formed on the upper surface of the substrate layer, Is formed between one or both selected from the base layer and the ink absorbing layer or the bottom surface of the base layer and consists of a flameproof layer having a thickness of 5 ~ 40㎛, The anti-flame layer composition for forming the anti-flame layer comprises 20-40% by weight of a resin selected from at least one of polyurethane or polyvinyl chloride based on the total weight of the anti-flame layer, and bromine, antimony, phosphorus, aluminum hydroxide, magnesium hydroxide, and inorganic type. Flame retardant 25-60 wt% using solely or mixed and 15-40 wt% of solvent using alone or mixed with methyl ethyl ketone (MEK), toluene, acetone, DMF (dimethylformamide) and methanol 0.1-10% by weight of the curing agent used in the curing agent, epoxy-based curing agent, melamine-based curing agent, 0.1-5% by weight of the silicone leveling or polymer leveling agent, 0.1-5% by weight of the silicone antifoaming agent or non-silicone antifoaming agent Flame-proof plastic film for inkjet printing. The flame retardant plastic film for inkjet printing according to claim 1, wherein when the anti-flame layer is formed on the bottom of the base layer, one of the primer layer and the corona layer is further formed between the base layer and the ink absorbing layer. The flame retardant plastic film for inkjet printing according to claim 1, wherein the flame-retardant plastic film further comprises a pressure-sensitive adhesive layer formed under the flame retardant layer formed on the bottom of the base layer. delete The method according to any one of claims 1 to 3, The ink absorbing layer composition for forming the ink absorbing layer is 25-70% by weight of a hydrophilic binder containing polyvinyl alcohol, 7-15% by weight of silica, dicyandiamide, ethylenediamine, Copolymer of diethylenetriamine or secondary arylamine derivative with allylamine, diallylamine, dimethyldiallylammonium chloride or polydiallyldimethylammonium compound with polyacrylate, polyacrylamide, polyvinylpyrrolidone 3-10% by weight of dye fixing agent used alone or in admixture selected from copolymers, dimethylamine-epichlorohydrin condensates, acrylamide-diallylamine copolymers and polyvinylamine polymers, 15-60% by weight of distilled water, additives 1-5% by weight, additives include crosslinking agents, fluorescent dyes, pH adjusting agents, antioxidants, antifoaming agents, leveling agents, lubricants, anti curling agents, Surfactants, flame proofing ink-jet printing a plastic film characterized by using the one or more selected from a curing agent. The flame retardant plastic film for inkjet printing according to claim 5, wherein silica is used in two or more kinds having different particle sizes. Comma-coating the anti-flame layer formed on the bottom of the base material layer made of a plastic film, forming a pressure-sensitive adhesive layer on the bottom of the flame-proof layer, the ink absorption layer formed on the top of the base layer is formed by comma coating, The anti-flame layer composition for forming the anti-flame layer comprises 20-40% by weight of a resin selected from at least one of polyurethane or polyvinyl chloride based on the total weight of the anti-flame layer composition, and bromine, antimony, phosphorus, aluminum hydroxide, magnesium hydroxide, and inorganic flame retardant. 25-60% by weight of flame retardant used alone or in combination, 15-40% by weight of solvent using MEK (Methyl Ethyl Ketone), toluene, acetone, DMF (dimethylformamide), methanol alone or in combination, and curing agent isocyanate curing agent, 0.1-10% by weight of the curing agent alternatively used among epoxy curing agent and melamine curing agent, 0.1-5% by weight of silicone leveling agent or polymer leveling agent, 0.1-5% by weight of silicone antifoaming agent or non-silicone antifoaming agent, The ink absorbing layer composition for forming the ink absorbing layer is 25-70% by weight of a hydrophilic binder containing polyvinyl alcohol, 7-15% by weight of silica, dicyandiamide, ethylenediamine, Copolymer of diethylenetriamine or secondary arylamine derivative with allylamine, diallylamine, dimethyldiallylammonium chloride or polydiallyldimethylammonium compound with polyacrylate, polyacrylamide, polyvinylpyrrolidone 3-10% by weight of dye fixing agent used alone or in a mixture selected from copolymers, dimethylamine-epichlorohydrin condensates, acrylamide-diallylamine copolymers and polyvinylamine polymers, 15-60% by weight of distilled water, additives 1-5% by weight, additives include crosslinking agents, fluorescent dyes, pH adjusting agents, antioxidants, antifoaming agents, leveling agents, lubricants, anti curling agents, A flame retardant plastic film manufacturing method for inkjet printing, characterized by using one or more of a surfactant and a curing agent.

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