Photographic paper base and photographic paper base

Abstract

The present invention relates to the field of photographic printing technology, and in particular to a photographic paper base and a photographic paper base. The photographic paper base of the present invention is characterized in that it comprises: a base layer; a plastic layer, which is arranged on at least one side of the base layer; an anti-adhesive layer, which is arranged on the side of the plastic layer away from the base layer; the anti-adhesive layer, in parts by mass, comprises: water, a thickener, a surfactant, an antistatic agent, an inorganic oxide, a coupling agent and a film hardener. The coupling agent provided by the present invention reacts with the inorganic oxide at one end to further form a network structure, making the anti-adhesive layer more dense and firm, and the other end can react with the thickener, ensuring the anti-adhesion effect while also enhancing the fastness of the base layer.

Description

Technical Field

[0001] The invention relates to the technical field of photographic printing, and in particular to a photographic paper base and a photographic paper base. Background Art

[0002] Double-sided silver halide paper is a paper with a photosensitive emulsion layer on both sides of the substrate, and photos can be washed on both sides. Compared with traditional single-sided silver halide paper, double-sided silver halide paper improves the utilization rate of the paper base, and the pictures can be washed on both sides. However, double-sided silver halide paper does not have an antistatic layer for eliminating static sparks, so a large amount of antistatic agent must be added to the bottom layer of the substrate. Antistatic agents often rely on retaining moisture to improve their antistatic effect. This will cause the gelatin on the front and back of the silver halide paper to adhere in a humid environment due to water absorption. In order to reduce the easy adhesion of double-sided silver halide paper, the surface of the mainstream double-sided silver halide paper products on the market is made into a fine suede or silk surface effect, which can reduce the contact area and thus reduce adhesion.

[0003] Therefore, it is urgent to develop a photographic paper with better anti-sticking effect. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides a photographic paper base and a photographic paper base with good anti-sticking effect.

[0005] To this end, the first aspect of the present invention provides a photographic paper base, comprising:

[0006] Grassroots;

[0007] A plastic layer is provided on at least one side of the base layer;

[0008] An anti-sticking layer is arranged on a side of the plastic layer away from the base layer;

[0009] The anti-sticking layer, in parts by mass, comprises:

[0010]

[0011] The structure of the coupling agent is shown in Formula I;

[0012] Formula I: R3-(R2) n -Si(OR1)3

[0013] In formula I, n is any integer from 1 to 6;

[0014] R1 includes C1-C20 alkyl;

[0015] R2 includes a substituted or unsubstituted methylene group;

[0016] R3 includes one or more of vinyl, amino, epoxy, acrylic, and acrylate groups.

[0017] The coupling agent provided by the present invention reacts with the inorganic oxide at one end to further form a network structure, making the anti-adhesive layer more compact and firm, and can react with the thickener at the other end to ensure the anti-adhesive effect while also enhancing the fastness of the bottom layer.

[0018] In some embodiments of the present invention, the substituent of the substituted methylene group includes one or more of halogen, oxygen atom, sulfur atom, nitrogen atom and phosphorus atom.

[0019] In some embodiments of the present invention, R1 comprises a C1-C10 alkyl group.

[0020] In some embodiments of the present invention, R1 comprises a C1-C4 alkyl group.

[0021] In some embodiments of the present invention, R2 comprises a methylene group.

[0022] In some embodiments of the present invention, R3 comprises an amino group or an acrylate group.

[0023] In some embodiments of the present invention, n is any integer from 1 to 6.

[0024] In some embodiments of the present invention, the coupling agent comprises at least one of the following:

[0025]

[0026] Thus, the coupling agent can further increase the fastness of the anti-adhesive layer.

[0027] In some embodiments of the present invention, the thickener includes one or more of gelatin, xanthan gum, chitosan, cellulose, gum arabic, and carrageenan.

[0028] In some embodiments of the present invention, the antistatic agent includes one or more of alkyl sulfonate, sulfate, lithium salt, sodium salt, potassium salt, betaine, sodium oligostyrene sulfonate, and sodium polyethylene sulfonate. Thus, the antistatic agent can further prevent the photographic paper base from generating static sparks.

[0029] In some embodiments of the present invention, the film hardener includes one or more of aluminum salts, chromium salts, olefin sulfone compounds, epoxy compounds, and aldehyde compounds. The film hardener can ensure the glossiness of the original base layer; the film hardener can react with the carboxyl group or carboxyl group in the thickener to cross-link the thickener molecules to form larger molecules, thereby achieving a film hardening effect.

[0030] In some embodiments of the present invention, the surfactant comprises a nonionic surfactant.

[0031] In some embodiments of the present invention, the sodium salt includes one or more of sodium chloride, sodium nitrate, sodium carbonate and sodium sulfate.

[0032] In some embodiments of the present invention, the lithium salt includes one or more of lithium chloride, lithium nitrate, lithium carbonate and lithium sulfate.

[0033] In some preferred embodiments of the present invention, the chromium salt comprises chromium trichloride.

[0034] In some preferred embodiments of the present invention, the aldehyde-based compound comprises formaldehyde.

[0035] In some preferred embodiments of the present invention, the nonionic surfactant comprises fatty alcohol polyoxyethylene ether.

[0036] In some embodiments of the present invention, the inorganic oxide includes one or more of silicon dioxide, aluminum oxide, zirconium oxide, and titanium oxide, thereby effectively preventing the paper base from sticking in a high humidity environment.

[0037] In some embodiments of the present invention, the particle size of the inorganic oxide is 1-100 nm.

[0038] In some embodiments of the present invention, the anti-sticking layer has a thickness of 0.05-0.2 μm.

[0039] In some embodiments of the present invention, the base layer comprises photographic base paper or resin synthetic paper.

[0040] In some embodiments of the present invention, the thickness of the base layer is 150-200 μm.

[0041] In some embodiments of the present invention, the plastic layer includes one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE).

[0042] The second aspect of the present invention provides a photographic paper comprising the photographic paper base.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 A schematic diagram of the structure of a photographic paper base according to one embodiment of the present invention is shown.

[0046] Description of reference numerals:

[0047] 1: Base layer; 2: Plastic layer; 3: Anti-stick layer. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0049] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0050] The first aspect of the present invention provides a photographic paper base, comprising:

[0051] Grassroots;

[0052] A plastic layer is provided on at least one side of the base layer;

[0053] An anti-sticking layer is arranged on a side of the plastic layer away from the base layer;

[0054] The anti-sticking layer, in parts by mass, comprises:

[0055]

[0056] The structure of the coupling agent is shown in Formula I;

[0057] Formula I: R3-(R2) n -Si(OR1)3

[0058] In formula I, n is any integer from 1 to 6;

[0059] R1 includes C1-C20 alkyl;

[0060] R2 includes a substituted or unsubstituted methylene group;

[0061] R3 includes one or more of vinyl, amino, epoxy, acrylic, and acrylate groups.

[0062] The coupling agent provided by the present invention reacts with the inorganic oxide at one end to further form a network structure, making the anti-adhesive layer more compact and firm, and can react with the thickener at the other end to ensure the anti-adhesive effect while also enhancing the fastness of the bottom layer.

[0063] In some embodiments of the present invention, the substituent of the substituted methylene group includes one or more of halogen, oxygen atom, sulfur atom, nitrogen atom and phosphorus atom.

[0064] In some embodiments of the present invention, R1 comprises a C1-C10 alkyl group.

[0065] In some embodiments of the present invention, the unsubstituted C1-C10 alkyl group may include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and the like groups, wherein the propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and the like groups may be either straight-chain alkyl groups or branched-chain alkyl groups.

[0066] In some embodiments of the present invention, the substituted C1-C10 alkyl group may include any one of fluorinated C1-C10 alkyl groups, chloro C1-C10 alkyl groups, bromo C1-C10 alkyl groups, iodo C1-C10 alkyl groups, oxo C1-C10 alkyl groups, thio C1-C10 alkyl groups, and methyl C1-C10 alkyl groups. C1-C10 alkyl groups are alkyl groups of 1 to 10 carbon atoms. As an example, chloro C1-C10 alkyl groups may include any one of chloromethyl, chloroethyl, chloropropyl, chlorobutyl, chloropentyl, chlorohexyl, chloroheptyl, chlorooctyl, chlorononyl, and chlorodecyl.

[0067] In some embodiments of the present invention, R1 comprises a C1-C4 alkyl group.

[0068] In some embodiments of the present invention, R2 comprises a methylene group.

[0069] In some embodiments of the present invention, R3 comprises an amino group or an acrylate group.

[0070] In some embodiments of the present invention, n is any integer from 1 to 6.

[0071] In some embodiments of the present invention, the coupling agent comprises at least one of the following:

[0072]

[0073] Thus, the coupling agent can further increase the fastness of the anti-adhesive layer.

[0074] In some embodiments of the present invention, the thickener includes one or more of gelatin, xanthan gum, chitosan, cellulose, gum arabic, and carrageenan.

[0075] In some preferred embodiments of the present invention, the thickening agent comprises gelatin.

[0076] In some embodiments of the present invention, the antistatic agent includes one or more of alkyl sulfonate, sulfate, lithium salt, sodium salt, potassium salt, betaine, sodium oligostyrene sulfonate, and sodium polyethylene sulfonate. Thus, the antistatic agent can further prevent the photographic paper base from generating static sparks.

[0077] In some embodiments of the present invention, the sodium salt includes one or more of sodium chloride, sodium nitrate, sodium carbonate and sodium sulfate.

[0078] In some embodiments of the present invention, the lithium salt includes one or more of lithium chloride, lithium nitrate, lithium carbonate and lithium sulfate.

[0079] In some embodiments of the present invention, the inorganic oxide includes one or more of silicon dioxide, aluminum oxide, zirconium oxide, and titanium oxide, thereby effectively preventing the paper base from sticking in a high humidity environment.

[0080] In some embodiments of the present invention, the particle size of the inorganic oxide is 1-100 nm.

[0081] In some embodiments of the present invention, the film hardener includes one or more of aluminum salts, chromium salts, olefin sulfone compounds, epoxy compounds, and aldehyde compounds. The film hardener can ensure the glossiness of the original base layer; the film hardener can react with the carboxyl group or carboxyl group in the thickener to cross-link the thickener molecules to form larger molecules, thereby achieving a film hardening effect.

[0082] In some preferred embodiments of the present invention, the chromium salt comprises chromium trichloride.

[0083] In some preferred embodiments of the present invention, the aldehyde-based compound comprises formaldehyde.

[0084] In some embodiments of the present invention, the surfactant comprises a nonionic surfactant.

[0085] In some preferred embodiments of the present invention, the nonionic surfactant comprises fatty alcohol polyoxyethylene ether.

[0086] In some preferred embodiments of the present invention, the anti-sticking layer comprises, in parts by mass:

[0087]

[0088] In some preferred embodiments of the present invention, the anti-sticking layer comprises, in parts by mass:

[0089]

[0090] In some embodiments of the present invention, the thickness of the anti-adhesive layer is 0.05-0.2 μm. As an example, the thickness of the anti-adhesive layer can be 0.05, 0.1, 0.12, 0.14, 0.15, 0.16, 0.17, 0.19 or 0.2 μm.

[0091] In some embodiments of the present invention, the base layer comprises photographic base paper or resin synthetic paper.

[0092] In some embodiments of the present invention, the base layer includes a raw material of photographic base paper including pure wood pulp; the pure wood pulp may be at least one of hardwood pulp and coniferous pulp.

[0093] In some embodiments of the present invention, the resin synthetic paper includes one or more of polypropylene (PP) synthetic paper, polyethylene (PE) synthetic paper, polyvinyl chloride (PVC) synthetic paper, and polyethylene terephthalate (PET) synthetic paper.

[0094] In some embodiments of the present invention, the thickness of the base layer is 150-200 μm. As an example, the thickness of the base layer can be 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm, 200 μm, etc. The base layer of the above thickness can make the photographic paper base have a lower volume resistance, so that the photographic paper base has better performance.

[0095] In some embodiments of the present invention, the plastic layer includes one or more of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE).

[0096] In some embodiments of the present invention, the plastic layer further comprises a masterbatch.

[0097] In some preferred embodiments of the present invention, the plastic layer includes, by mass, 40-60 parts of high-density polyethylene, 20-30 parts of low-density polyethylene, and 5-20 parts of masterbatch.

[0098] In some embodiments of the present invention, the thickness of the plastic layer is 15-30 μm. As an example, the thickness of the plastic layer can be 15, 17, 19, 20, 22, 24, 26, 28 or 30 μm.

[0099] In some preferred embodiments of the present invention, the plastic layer is disposed on both sides of the base layer. Thus, by disposing the plastic layer on both sides of the base layer, it can play an anti-seepage and waterproof role, protecting the paper base from being soaked by liquid and water vapor.

[0100] In some preferred embodiments of the present invention, the anti-adhesion layer is disposed on the side of the plastic layer away from the base layer. Thus, by disposing the anti-adhesion layer on the side of the plastic layer away from the base layer, the anti-adhesion effect can be further achieved.

[0101] As a result, the double-sided glossy paper base has a smooth surface and high gloss, the paper base utilization rate is doubled, and the resulting photo album is lighter.

[0102] In some preferred embodiments of the present invention, the photographic paper base is Figure 1 As shown, it includes an anti-sticking layer 3, a plastic layer 2, a base layer 1, a plastic layer 2 and an anti-sticking layer 3 which are stacked in sequence.

[0103] In some embodiments of the present invention, the method for preparing a photographic paper base comprises the following steps:

[0104] Plastic layers are formed on both sides of the base layer.

[0105] Anti-sticking layers are respectively formed on the sides of the two plastic layers away from the base layer.

[0106] In some embodiments of the present invention, the raw materials for preparing the anti-sticking layer are mixed with water, coated on the surface of the plastic layer, and dried to form the anti-sticking layer.

[0107] In some embodiments of the present invention, the drying temperature is 100-120° C. and the drying time is 1-2 min.

[0108] In some embodiments of the present invention, the coating method includes one of dip coating, air knife coating, curtain coating, and extrusion coating.

[0109] The second aspect of the present invention provides a photographic paper comprising the photographic paper base.

[0110] In the present invention, the term "substitution" means that one or more hydrogens on the designated atom are replaced by the indicated group, provided that the normal valence of the designated atom in the existing situation is not exceeded and the substitution produces a stable compound. Substituents and / or variables can be combined as long as such combination produces a stable compound.

[0111] In the present invention, the term "halogen" refers to fluorine (F), chlorine (Cl), bromine (Br) and iodine (I).

[0112] In the present invention, the term "alkyl" refers to a straight or branched aliphatic hydrocarbon group. In the present invention, alkyl includes (but is not limited to) methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, etc.

[0113] The scheme of the present disclosure will be explained below in conjunction with the examples. It will be appreciated by those skilled in the art that the following examples are only used to illustrate the present disclosure and should not be considered as limiting the scope of the present disclosure. Where specific techniques or conditions are not indicated in the examples, the techniques or conditions described in the literature in this area or the product instructions are used. The reagents or instruments used that do not indicate the manufacturer are all conventional products that can be obtained commercially.

[0114] The coupling agent KH550 used in the embodiment of the present invention is γ-aminopropyltriethoxysilane, and its structural formula is:

[0115]

[0116] The coupling agent KH570 used in the embodiment of the present invention is γ-methacryloxypropyltrimethoxysilane, and its structural formula is:

[0117]

[0118] The surfactant 7# used in the embodiment of the present invention is fatty alcohol polyoxyethylene ether.

[0119] The particle size of silicon dioxide used in the embodiment of the present invention is 50 nm; the particle size of aluminum oxide is 40 nm.

[0120] Example 1

[0121] The photographic paper base of this embodiment is composed of an anti-adhesive layer, a plastic layer, a base layer, a plastic layer and an anti-adhesive layer stacked in sequence from bottom to top; the glossiness of the photographic paper base of this embodiment is ≥95% (60° angle); the preparation method of the photographic paper base comprises the following steps:

[0122] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0123] (2) The front and back sides of the base paper layer are coated with PE to form a plastic layer on both sides of the base layer. The thickness of each plastic layer is 25 μm, and the Ra of the plastic layer is 0.15 μm and Rz is 1.2 μm.

[0124] (3) Add gelatin into deionized water according to the following ratio. After 30 minutes, wait for the gelatin to absorb water and swell. Heat and stir in a 50°C water bath to completely dissolve the gelatin. Add surfactant 7#, lithium nitrate, silicon dioxide, coupling agent KH550 and chromium trichloride in sequence, stir thoroughly, and apply on the surface of the two plastic layers. Dry at 100°C for 1 minute to form anti-sticking layers on the surfaces of the two plastic layers. The thickness of each anti-sticking layer is 0.1 μm.

[0125]

[0126]

[0127] Example 2

[0128] The photographic paper base of this embodiment is composed of an anti-adhesive layer, a plastic layer, a base layer, a plastic layer and an anti-adhesive layer stacked in sequence from bottom to top; the glossiness of the photographic paper base of this embodiment is ≥95% (60° angle); the preparation method of the photographic paper base comprises the following steps:

[0129] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0130] (2) The front and back sides of the base paper layer are coated with PE to form a plastic layer on both sides of the base layer. The thickness of each plastic layer is 25 μm, and the Ra of the plastic layer is 0.15 μm and Rz is 1.2 μm.

[0131] (3) According to the following ratio, gelatin was added into deionized water. After 30 minutes, the gelatin was swollen by water absorption. The mixture was heated and stirred in a 50°C water bath to completely dissolve the gelatin. Surfactant 7#, sodium polystyrene sulfonate, silica, coupling agent KH550 and chromium trichloride were added in sequence. The mixture was fully stirred and coated on the surfaces of the two plastic layers. The mixture was dried at 100°C for 1 minute. Anti-sticking layers were formed on the surfaces of the two plastic layers. The thickness of each anti-sticking layer was 0.1 μm.

[0132]

[0133] Example 3

[0134] The photographic paper base of this embodiment is composed of an anti-adhesive layer, a plastic layer, a base layer, a plastic layer and an anti-adhesive layer stacked in sequence from bottom to top; the glossiness of the photographic paper base of this embodiment is ≥95% (60° angle); the preparation method of the photographic paper base comprises the following steps:

[0135] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0136] (2) The front and back sides of the base paper layer are coated with PE to form a plastic layer on both sides of the base layer. The thickness of each plastic layer is 25 μm, and the Ra of the plastic layer is 0.15 μm and Rz is 1.2 μm.

[0137] (3) Add gelatin to deionized water according to the following ratio. After 30 minutes, wait for the gelatin to absorb water and swell. Heat and stir in a 50°C water bath to completely dissolve the gelatin. Add surfactant 7#, potassium chloride, aluminum oxide, coupling agent KH570 and chromium trichloride in sequence, stir thoroughly, and apply on the surface of the two plastic layers. Dry at 100°C for 1 minute to form anti-sticking layers on the surfaces of the two plastic layers. The thickness of each anti-sticking layer is 0.1 μm.

[0138]

[0139]

[0140] Example 4

[0141] The photographic paper base of this embodiment is composed of an anti-adhesive layer, a plastic layer, a base layer, a plastic layer and an anti-adhesive layer stacked in sequence from bottom to top; the glossiness of the photographic paper base of this embodiment is ≥95% (60° angle); the preparation method of the photographic paper base comprises the following steps:

[0142] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0143] (2) The front and back sides of the base paper layer are coated with PE to form a plastic layer on both sides of the base layer. The thickness of each plastic layer is 25 μm, and the Ra of the plastic layer is 0.15 μm and Rz is 1.2 μm.

[0144] (3) According to the following ratio, gelatin was added into deionized water. After 30 minutes, the gelatin was swollen by absorbing water. The mixture was heated and stirred in a 50°C water bath to completely dissolve the gelatin. Surfactant 7#, lithium nitrate, silicon dioxide, coupling agent KH550 and formaldehyde were added in sequence. The mixture was fully stirred and applied onto the surfaces of the two plastic layers. The mixture was dried at 100°C for 1 minute. Anti-sticking layers were formed on the surfaces of the two plastic layers. The thickness of each anti-sticking layer was 0.1 μm.

[0145]

[0146] Example 5

[0147] The photographic paper base of this embodiment is composed of an anti-adhesive layer, a plastic layer, a base layer, a plastic layer and an anti-adhesive layer stacked in sequence from bottom to top; the glossiness of the photographic paper base of this embodiment is ≥95% (60° angle); the preparation method of the photographic paper base comprises the following steps:

[0148] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0149] (2) The front and back sides of the base paper layer are coated with PE to form a plastic layer on both sides of the base layer. The thickness of each plastic layer is 25 μm, and the Ra of the plastic layer is 0.15 μm and Rz is 1.2 μm.

[0150] (3) According to the following ratio, gelatin was added into deionized water. After 30 minutes, the gelatin was swollen by water absorption. The mixture was heated and stirred in a 50°C water bath to completely dissolve the gelatin. Surfactant 7#, lithium nitrate, silicon dioxide, coupling agent KH570 and chromium trichloride were added in sequence. The mixture was fully stirred and coated on the surfaces of the two plastic layers. The mixture was dried at 100°C for 1 minute. Anti-sticking layers were formed on the surfaces of the two plastic layers. The thickness of each anti-sticking layer was 0.1 μm.

[0151]

[0152] Comparative Example 1

[0153] The photographic paper base of this comparative example is different from that of Example 1 only in that the coupling agent (KH550) and inorganic oxide (silicon dioxide) in the anti-adhesive layer are omitted in this comparative example, and the missing amount of the coupling agent and inorganic oxide is distributed to the corresponding components according to the proportion of the remaining components in the anti-adhesive layer. The remaining steps are carried out according to the method in Example 1.

[0154] Comparative Example 2

[0155] The photographic paper base of this comparative example is different from that of Example 1 only in that the antistatic agent (lithium nitrate), coupling agent (KH550) and inorganic oxide (silicon dioxide) in the anti-adhesive layer are omitted in this comparative example, and the missing amounts of the antistatic agent, coupling agent and inorganic oxide are distributed to the corresponding components according to the proportions of the remaining components in the anti-adhesive layer. The remaining steps are carried out according to the method in Example 1.

[0156] Comparative Example 3

[0157] The photographic paper base of this comparative example is different from that of Example 1 only in that the coupling agent (KH550) and thickener (gelatin) in the anti-adhesive layer are omitted in this comparative example, and the missing amount of the coupling agent and the inorganic oxide is distributed to the corresponding components according to the proportion of the other components in the anti-adhesive layer. The remaining steps are carried out according to the method in Example 1.

[0158] Comparative Example 4

[0159] The photographic paper base of this comparative example is different from that of Example 1 only in that the photographic paper base of this comparative example is composed of a plastic layer, an anti-adhesive layer, a base layer, an anti-adhesive layer and a plastic layer stacked in sequence from bottom to top, and the preparation method comprises the following steps:

[0160] (1) A base paper with a broadleaf pulp content of 85 wt% was used as the base layer, and the thickness of the base layer was 170 μm.

[0161] (2) According to the ratio in Example 1, gelatin was added to deionized water. After 30 minutes, the gelatin absorbed water and swelled. The gelatin was heated and stirred in a 50°C water bath to completely dissolve the gelatin. Surfactant 7#, sodium polystyrene sulfonate, silica, coupling agent KH550 and chromium trichloride were added in sequence. The mixture was fully stirred and coated on the surfaces of both sides of the base layer. The mixture was dried at 100°C for 1 minute to form anti-sticking layers on both sides of the base layer. The thickness of each anti-sticking layer was 0.1 μm.

[0162] (3) PE coating is applied on the front and back sides of the anti-adhesive layer, and plastic layers are formed on the surfaces of both anti-adhesive layers, and the thickness of each plastic layer is 25 μm.

[0163] Test Case

[0164] 1. Resistance test: Test the surface resistance at a temperature of 25±2℃ and a humidity of 50±2%RH. The test results are shown in Table 1.

[0165] 2. Anti-stick test: Cut the sample into 4cm×4cm size, and press it with 50g / cm2 flat pressure method at 80% RH and 40℃. 2 Aging for 24 hours; calculate the adhesion ratio according to the following formula;

[0166] Adhesion ratio = (adhesion area) / sample area*100%; the test results are shown in Table 1.

[0167] 3. Test fastness: Coat a photographic emulsion layer on a photographic substrate, and after washing with a liquid chemical, test its wet strength and edge collapse. The test results are shown in Table 1.

[0168] Table 1

[0169] Surface resistance(Ω) Adhesion ratio Edge collapse Wet strength(N) Example 1 <![CDATA[1.0*10 8 ]]> 0 No broken edge 0.35 Example 2 <![CDATA[1.0*10 8 ]]> 0 No broken edge 0.37 Example 3 <![CDATA[1.0*10 8 ]]> 0 No broken edge 0.41 Example 4 <![CDATA[1.0*10 8 ]]> 0 No broken edge 0.36 Example 5 <![CDATA[1.0*10 8 ]]> 0 No broken edge 0.38 Comparative Example 1 <![CDATA[1.0*10 8 ]]> ＞85％ Collapse 0.11 Comparative Example 2 <![CDATA[>1.0*10 12 ]]> ＞80％ Collapse 0.12 Comparative Example 3 <![CDATA[>1.0*10 12 ]]> / Demolding 0 Comparative Example 4 <![CDATA[>1.0*10 12 ]]> / Demolding 0

[0170] Note: Edge Cracking of photographic paper base refers to the phenomenon that the edges of photographic paper crack or break during printing, handling or drying. Photographic paper base is the paper used to support light-sensitive emulsions. It needs to have sufficient strength, toughness and proper humidity control to avoid edge damage during printing, exposure, washing, etc.

[0171] It can be seen from Table 1 that, compared with the comparative example, the photographic paper base of the embodiment of the present invention can meet the antistatic requirements of glossy paper and has excellent anti-adhesion effect, and has good fastness and no edge collapse during the photo processing process.

[0172] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "some implementation schemes" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0173] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A photographic paper base, characterized in that: include: Grassroots; A plastic layer is provided on at least one side of the base layer; An anti-sticking layer is arranged on a side of the plastic layer away from the base layer; The anti-sticking layer, in parts by mass, comprises: The structure of the coupling agent is shown in Formula I; Formula I: R3-(R2) n -Si(OR1)3 In formula I, n is any integer from 1 to 6; R1 includes C1-C20 alkyl; R2 includes a substituted or unsubstituted methylene group; R3 includes one or more of vinyl, amino, epoxy, acrylic, and acrylate groups.

2. The photographic paper base according to claim 1, characterized in that The substituent of the substituted methylene group includes one or more of halogen, oxygen atom, sulfur atom, nitrogen atom and phosphorus atom; and / or, R1 includes a C1-C10 alkyl group.

3. The photographic paper base according to claim 2, characterized in that R1 includes C1-C4 alkyl; and / or, R2 includes a methylene group; and / or, R3 includes an amino group or an acrylate group; and / or, n is any integer from 1 to 6.

4. The photographic paper base according to claim 1, characterized in that The coupling agent includes at least one of the following:

5. The photographic paper base according to claim 1, characterized in that The thickener includes one or more of gelatin, xanthan gum, chitosan, cellulose, gum arabic, and carrageenan; and / or, The antistatic agent includes one or more of alkyl sulfonate, sulfate, lithium salt, sodium salt, potassium salt, betaine, sodium oligostyrene sulfonate, and sodium polyethylene sulfonate; and / or, The film hardener includes one or more of aluminum salts, chromium salts, olefin sulfone compounds, epoxy compounds, and aldehyde compounds; and / or, The surfactant includes a nonionic surfactant.

6. The photographic paper base according to claim 5, characterized in that The sodium salt includes one or more of sodium chloride, sodium nitrate, sodium carbonate and sodium sulfate; and / or, The lithium salt includes one or more of lithium chloride, lithium nitrate, lithium carbonate and lithium sulfate; and / or, The chromium salt comprises chromium trichloride; and / or, The aldehyde compound comprises formaldehyde; and / or, The nonionic surfactant includes fatty alcohol polyoxyethylene ether.

7. The photographic paper base according to claim 1, characterized in that The inorganic oxide includes one or more of silicon dioxide, aluminum oxide, zirconium oxide, and titanium oxide; and / or, The particle size of the inorganic oxide is 1-100 nm.

8. The photographic paper base according to claim 1, characterized in that The thickness of the anti-sticking layer is 0.05-0.2 μm.

9. The photographic paper base according to claim 1, characterized in that The base layer comprises photographic base paper or resin synthetic paper; and / or, The thickness of the base layer is 150-200 μm; and / or, The plastic layer includes one or more of high-density polyethylene, low-density polyethylene, and linear low-density polyethylene; and / or, The thickness of the plastic layer is 15-35 μm.

10. A photographic paper, characterized in that: A photographic paper base comprising any one of claims 1-9.

Images