Weak solvent ink-jet ink for outdoor advertisement, ink-jet ink resin and preparation method of ink-jet ink resin

Abstract

The invention discloses weak solvent ink-jet ink for outdoor advertisement, ink-jet ink resin and a preparation method of the ink-jet ink resin. The weak-solvent ink-jet ink resin for outdoor advertisements comprises deionized water, methyl methacrylate, methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, a functional monomer, a crosslinking monomer, an anionic emulsifier and an initiator. The ink-jet ink resin and the ink-jet ink using the ink-jet ink resin can be endowed with certain water resistance, salt fog resistance and gloss through matched use of the soft functional monomer and the hard functional monomer, meanwhile, the cured ink-jet ink can be endowed with proper hardness, and the ink-jet ink is not prone to after-tack when printed on a base material. The ink-jet ink resin is modified through the cross-linking reaction of the functional monomer and the cross-linking monomer with the resin, so that the viscosity, the adhesive force, the color rendering property, the water resistance, the sun-proof property and the solvent compatibility of the obtained resin can be remarkably improved, and the use requirements of the weak-solvent ink-jet ink for outdoor advertisements can be met.

Description

Technical Field

[0001] The invention relates to the field of printer ink, and in particular to a weak solvent inkjet ink for outdoor advertising, an inkjet ink resin and a method for preparing the inkjet ink resin. Background Art

[0002] Inkjet printing is a process of printing that is achieved without the printing device contacting the substrate. This technology involves spraying a stream of ink droplets onto the surface of the substrate and controlling the direction of the droplet stream so that the droplets form a desired printed image on the surface of the substrate. Therefore, compared with traditional inks, inkjet inks have higher requirements.

[0003] A Chinese patent document with publication number CN108485379A discloses a sun-fast water-based dye inkjet printing ink. The inkjet printing ink improves the sun-fastness, weather-resistant, and waterproof properties of printed text and images by using styrene acrylic resin in combination with an ultraviolet absorber, thereby alleviating the problems of image fading and blurring. However, styrene acrylic resin has the problems of yellowing resistance and poor weather resistance, and cannot solve the problem that the inkjet printing ink is not sun-fast and easy to fade.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] The purpose of the present invention is to provide a weak solvent inkjet ink for outdoor advertising, an inkjet ink resin and a method for preparing the inkjet ink resin, aiming to solve the problem that the existing inkjet printing ink is not sun-resistant and easy to fade.

[0006] To achieve the above object, the solution provided by the present invention is:

[0007] The present invention provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0008] 70-75 parts of deionized water, 13-15 parts of methyl methacrylate, 5-8 parts of methyl acrylate, 8-12 parts of butyl acrylate, 8-10 parts of isooctyl acrylate, 7-10 parts of functional monomers, 2-3 parts of cross-linking monomers, 0.5-1.5 parts of anionic emulsifiers, and 1 part of initiator.

[0009] Optionally, the functional monomer includes at least one of an acrylic functional monomer and a methacrylic functional monomer.

[0010] Optionally, the methacrylic functional monomer includes at least one of methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and glycidyl methacrylate.

[0011] Optionally, the cross-linking monomer includes at least one of a cross-linking monomer HA and diacetone acrylamide.

[0012] Optionally, the anionic emulsifier includes at least one of alkyl sulfonates and polyoxyethylene ether sulfates.

[0013] Optionally, the alkyl sulfonate comprises dodecyl sulfonate.

[0014] Optionally, the polyoxyethylene ether sulfate includes fatty alcohol polyoxyethylene ether sulfate.

[0015] Optionally, the initiator includes at least one of sodium peroxide and sodium persulfate.

[0016] The present invention also provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, comprising the following steps:

[0017] S001. Add deionized water to the emulsification tank, then add anionic emulsifier to the emulsification tank, then start stirring, and slowly add a mixture of functional monomer, butyl acrylate, methyl acrylate, and crosslinking monomer, and maintain stirring for 20 to 30 minutes to obtain a pre-emulsion A;

[0018] S002. The functional monomer, methyl methacrylate, methyl acrylate, butyl acrylate, isooctyl acrylate were added to a blender and stirred for 20 to 30 minutes to obtain a mixed monomer B;

[0019] S003. The reactor was heated to 80 to 85 ° C, 5% by weight of the pre-emulsion A was added to the reactor, stirred evenly, and then the initiator solution A was added to the reactor, and the temperature was kept for 30 to 35min to completely polymerize the seed monomer in the pre-emulsion A;

[0020] S004. Control the temperature of the reactor to 78 to 80 ° C, and then dropwise add the remaining pre-emulsion A and initiator solution B;

[0021] S005. After the pre-emulsion A and the initiator solution B are added dropwise, the reactor is kept warm for 1 hour. After the end of the insulation, the pH value of the material in the reactor is adjusted to 6 to 7;

[0022] S006. Continue to control the temperature of the reactor at 78 to 80 ° C, and start dropping the mixed monomer B and initiator solution C;

[0023] S007. After the mixed monomer B and initiator solution C are added dropwise, the reactor is kept warm for 1 hour. After the insulation is completed, the pH value of the material in the reactor is adjusted to 8-9, and then the reactor is cooled down and the material in the reactor is filtered to obtain a weak solvent inkjet ink resin for outdoor advertising.

[0024] The present invention also provides a weak solvent inkjet ink for outdoor advertising, comprising the following components in parts by weight:

[0025] 10-20 parts of deionized water, 10-20 parts of moisturizing agent, 20-25 parts of propylene glycol methyl ether, 16-18 parts of isopropyl alcohol, 8-14 parts of ethylene glycol, 10 parts of inkjet ink resin, 3-6 parts of color paste, 1-2 parts of surfactant, and 0.2-0.5 parts of pH stabilizer.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a weak solvent inkjet ink resin for outdoor advertising. Through the use of soft and hard functional monomers, the inkjet ink resin and the inkjet ink using the inkjet ink resin can be given certain water resistance, salt spray resistance and gloss, and at the same time, the cured inkjet ink can be given a suitable hardness, and the inkjet ink is not easy to stick back when printed on a substrate. The inkjet ink resin is modified by the cross-linking reaction of the functional monomer and the cross-linking monomer with the resin, and the viscosity, adhesion, color development, water resistance, light resistance, and solvent compatibility of the obtained resin can be significantly improved, which can meet the use requirements of weak solvent inkjet ink for outdoor advertising.

[0028] The invention provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising. In the preparation method provided by the invention, a pre-emulsion A and a mixed monomer B are first prepared, and then after the seed monomer in the pre-emulsion A is completely polymerized, the remaining pre-emulsion A and the mixed monomer B are dripped in sequence, thereby realizing multi-stage polymerization of the resin material. The inkjet ink (acrylic resin) resin is polymerized in a multi-stage polymerization manner, and the structure of the resin molecule can become more complex and diversified, which provides more penetration channels and opportunities for interaction for the solvent molecules, so that the solvent molecules can more easily penetrate between the resin molecular chains and form a stable interaction with the resin molecules, thereby helping to improve the compatibility of the inkjet resin and the ink solvent, so that the weather resistance, water resistance and other properties of the inkjet ink product can be improved.

[0029] The invention provides a weak solvent inkjet ink for outdoor advertising. The inkjet ink resin does not contain yellowing groups such as styrene and sulfur, and has excellent light fastness and color rendering properties compared with existing inkjet printing inks. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flow chart of a method for preparing an inkjet ink resin for outdoor advertising. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0033] 70-75 parts of deionized water, 13-15 parts of methyl methacrylate, 5-8 parts of methyl acrylate, 8-12 parts of butyl acrylate, 8-10 parts of isooctyl acrylate, 7-10 parts of functional monomers, 2-3 parts of cross-linking monomers, 0.5-1.5 parts of anionic emulsifiers, and 1 part of initiator.

[0034] In the above composition, methyl methacrylate is a hard monomer, which can give the inkjet ink resin and the inkjet ink using the inkjet ink resin certain water resistance, salt spray resistance and gloss. Methyl acrylate, butyl acrylate and isooctyl acrylate are soft monomers, which can increase the drying speed of the inkjet ink resin film and give the cured inkjet ink a suitable hardness, so that the inkjet ink is not easy to stick back when printed on the substrate.

[0035] In the above composition, the functional monomer can participate in the cross-linking reaction to form a more compact and stable acrylic resin network structure, which can more effectively resist the penetration and erosion of water molecules, thereby improving the water resistance of the inkjet ink resin and the inkjet ink. In addition, when the functional monomer is introduced into the inkjet ink resin system, the compatibility of the inkjet ink resin with the organic solvent is better, which can not only improve the stability of the inkjet ink and optimize the ink viscosity, but also improve the ink adhesion and weather resistance.

[0036] In the above composition, the cross-linking monomer can introduce a cross-linking structure into the inkjet ink resin. These cross-linking structures connect the resin molecules together through chemical bonds, forming a more compact and stable network structure. This network structure reduces the channels for water penetration, thereby improving the water resistance of the inkjet ink resin and the inkjet ink. Since the water resistance of the inkjet ink can be improved, the inkjet ink can maintain good color stability and adhesion when it comes into contact with other chemical substances, and is not easy to fade, thereby maintaining high color rendering and clarity.

[0037] Optionally, the functional monomer includes at least one of an acrylic acid functional monomer and a methacrylic acid functional monomer. Both the acrylic acid functional monomer and the methacrylic acid functional monomer contain carbon-carbon unsaturated double bonds, which can participate in the cross-linking reaction to form a more compact and stable resin network structure, and this resin network structure can more effectively resist the penetration and erosion of water molecules, thereby improving the water resistance of the inkjet ink resin and the inkjet ink.

[0038] Optionally, the methacrylic acid functional monomer includes at least one of methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and glycidyl methacrylate. Compared with acrylic acid functional monomers, methacrylic acid functional monomers have a stronger steric hindrance effect. When introduced into the inkjet ink resin system, the inkjet ink resin has better compatibility with organic solvents, which can not only improve the stability of the inkjet ink and optimize the ink viscosity, but also improve the ink adhesion and weather resistance.

[0039] Optionally, the cross-linking monomer includes at least one of a cross-linking monomer HA and diacetone acrylamide. The cross-linking monomer HA is a derivative of methacrylate and contains an acrylamide group. The acrylamide group can undergo a cross-linking reaction with a functional group in the inkjet ink resin (acrylic resin) to form a tighter network structure, thereby reducing the channels for water penetration and improving the waterproof performance of the resin. Diacetone acrylamide has the characteristic of self-cross-linking at room temperature. After copolymerization with acrylic resin, ketone carbon groups can be introduced into the resin system. Ketone carbon groups can cause the polymer to undergo a graft cross-linking reaction to form a more stable resin network structure, and this resin network structure can also further reduce the possibility of water penetration and improve the waterproof performance of inkjet ink and inkjet ink resin.

[0040] In addition, through the cross-linking effect of diacetone amide, the heat resistance of acrylic resin can be significantly improved, so that the weather resistance of inkjet ink can also be improved; and through the cross-linking effect of diacetone amide, the adhesion between acrylic resin and substrate can be enhanced, so that the adhesion of inkjet ink is improved.

[0041] Optionally, the anionic emulsifier includes at least one of alkyl sulfonate and polyoxyethylene ether sulfate. The anionic emulsifier has a hydrophilic sulfonic acid group and a hydrophilic sulfuric acid group, which can interact with the carboxyl group of the acrylic monomer, which helps the emulsifier to be better adsorbed on the surface of the acrylic monomer, achieve a better emulsification effect, and avoid the agglomeration of the inkjet ink resin (acrylic resin). In addition, the hydrophilic group is more likely to interact with water or other polar solvents, so that the inkjet ink has excellent interpenetration on the substrate.

[0042] Optionally, the alkyl sulfonate includes dodecyl sulfonate, and the polyoxyethylene ether sulfate includes fatty alcohol polyoxyethylene ether sulfate. Optionally, the initiator includes at least one of sodium peroxide and sodium persulfate.

[0043] The present invention also provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, comprising the following steps:

[0044] S001. Add deionized water to the emulsification tank, then add anionic emulsifier to the emulsification tank, then start stirring, and slowly add a mixture of functional monomer, butyl acrylate, methyl acrylate, and crosslinking monomer, and maintain stirring for 20 to 30 minutes to obtain a pre-emulsion A;

[0045] S002. The functional monomer, methyl methacrylate, methyl acrylate, butyl acrylate, isooctyl acrylate were added to a blender and stirred for 20 to 30 minutes to obtain a mixed monomer B;

[0046] S003. The reactor was heated to 80 to 85 ° C, 5% by weight of the pre-emulsion A was added to the reactor, stirred evenly, and then the initiator solution A was added to the reactor, and the temperature was kept for 30 to 35min to completely polymerize the seed monomer in the pre-emulsion A;

[0047] S004. Control the temperature of the reactor to 78 to 80 ° C, and then dropwise add the remaining pre-emulsion A and initiator solution B;

[0048] S005. After the pre-emulsion A and the initiator solution B are added dropwise, the reactor is kept warm for 1 hour. After the end of the insulation, the pH value of the material in the reactor is adjusted to 6 to 7;

[0049] S006. Continue to control the temperature of the reactor at 78 to 80 ° C, and start dropping the mixed monomer B and initiator solution C;

[0050] S007. After the mixed monomer B and initiator solution C are added dropwise, the reactor is kept warm for 1 hour. After the insulation is completed, the pH value of the material in the reactor is adjusted to 8-9, and then the reactor is cooled down and the material in the reactor is filtered to obtain a weak solvent inkjet ink resin for outdoor advertising.

[0051] In the preparation method provided by the present invention, a pre-emulsion A and a mixed monomer B are first prepared, and then after the seed monomer in the pre-emulsion A is completely polymerized, the remaining pre-emulsion A and the mixed monomer B are added dropwise in sequence, thereby realizing multi-stage polymerization of the resin material. The inkjet ink (acrylic resin) resin is polymerized by multi-stage polymerization, and the structure of the resin molecules can become more complex and diversified, which provides more penetration channels and opportunities for interaction for the solvent molecules, so that the solvent molecules can more easily penetrate between the resin molecular chains and form a stable interaction with the resin molecules, thereby helping to improve the compatibility of the inkjet resin and the ink solvent, so that the weather resistance, water resistance and other properties of the inkjet ink product can be improved.

[0052] The present invention also provides a weak solvent inkjet ink for outdoor advertising, comprising the following components in parts by weight:

[0053] 10-20 parts of deionized water, 10-20 parts of moisturizing agent, 20-25 parts of propylene glycol methyl ether, 16-18 parts of isopropyl alcohol, 8-14 parts of ethylene glycol, 10 parts of inkjet ink resin, 3-6 parts of color paste, 1-2 parts of surfactant, and 0.2-0.5 parts of pH stabilizer.

[0054] Among them, the color paste can be CW-Black 7, JCW-Blue 154, JCW-Red 122, JCW-Red 146, JCW-Yellow 74, JCW-Yellow 151, and JCW-Yellow 180.

[0055] In the weak solvent inkjet ink for outdoor advertising provided by the present invention, the resin does not contain yellowing groups such as styrene and sulfur, and has excellent light resistance and color rendering properties compared with existing inkjet printing inks.

[0056] In order to further illustrate the weak solvent inkjet ink resin for outdoor advertising, the preparation method of the inkjet ink resin and the inkjet ink provided by the present invention, the following examples and comparative examples are provided.

[0057] Example 1

[0058] This embodiment provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0059] 75 parts of deionized water, 13 parts of methyl methacrylate, 5 parts of methyl acrylate, 10 parts of butyl acrylate, 8 parts of isooctyl acrylate, 9 parts of functional monomer (methacrylic acid), 3 parts of cross-linking monomer HA, 1 part of anionic emulsifier (dodecyl sulfonate), and 1 part of initiator (sodium persulfate).

[0060] This embodiment provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, comprising the following steps:

[0061] S001. Add 10 parts of deionized water to an emulsifying tank, then add 1 part of dodecyl sulfonate to the emulsifying tank, then start stirring, and slowly add 9 parts of methacrylic acid, 5 parts of methyl methacrylate, 7 parts of butyl acrylate, 2 parts of methyl acrylate, and 3 parts of crosslinking monomer HA, and maintain stirring for 20 to 30 minutes to obtain a pre-emulsion A;

[0062] S002. 8 parts of methyl methacrylate, 3 parts of methyl acrylate, 3 parts of butyl acrylate and 8 parts of isooctyl acrylate were added to a blender and stirred for 20 to 30 minutes to obtain a mixed monomer B;

[0063] S003. The reactor was heated to 80-85°C, 35 parts of deionized water and 5% by weight of pre-emulsion A were added to the reactor, stirred evenly, and then initiator solution A was added to the reactor, and the mixture was kept warm for 30 min to completely polymerize the seed monomer in the pre-emulsion A, wherein the initiator solution A consisted of 0.15 parts of sodium persulfate and 10 parts of deionized water;

[0064] S004. Control the temperature of the reactor to 78 to 80 ° C, and then dropwise add the remaining pre-emulsion A and initiator solution B, wherein the initiator solution B consists of 0.5 parts of sodium persulfate and 10 parts of deionized water;

[0065] S005. After the pre-emulsion A and the initiator solution B are added dropwise, the reactor is kept warm for 1 hour. After the end of the insulation, the pH value of the material in the reactor is adjusted to 6 to 7;

[0066] S006. Continue to control the temperature of the reactor at 78 to 80 ° C, start dropping the mixed monomer B and initiator solution C, the dropping time is 2h, the initiator solution C consists of 0.35 parts of sodium persulfate and 10 parts of deionized water;

[0067] S007. After the mixed monomer B and initiator solution C are added dropwise, the reactor is kept warm for 1 hour. After the insulation is completed, the pH value of the material in the reactor is adjusted to 8-9, and then the reactor is cooled down and the material in the reactor is filtered to obtain a weak solvent inkjet ink resin for outdoor advertising.

[0068] Example 2

[0069] This embodiment provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0070] 75 parts of deionized water, 13 parts of methyl methacrylate, 5 parts of methyl acrylate, 10 parts of butyl acrylate, 8 parts of isooctyl acrylate, 9 parts of functional monomer (hydroxyethyl methacrylate), 3 parts of cross-linking monomer HA, 1 part of anionic emulsifier (fatty alcohol polyoxyethylene ether sulfate), and 1 part of initiator (sodium persulfate).

[0071] This embodiment provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, including steps S001 to S007, wherein steps S003 to S007 are the same as those in embodiment 1.

[0072] Step S001 is: add 10 parts of deionized water into an emulsifying tank, then add 1 part of fatty alcohol polyoxyethylene ether sulfate into the emulsifying tank, then start stirring, and slowly add 7 parts of hydroxyethyl methacrylate, 5 parts of methyl methacrylate, 10 parts of butyl acrylate, 2 parts of methyl acrylate, and 3 parts of cross-linking monomer HA, and maintain stirring for 20 to 30 minutes to obtain pre-emulsion A;

[0073] Step S002 is: adding 8 parts of methyl methacrylate, 3 parts of methyl acrylate, 2 parts of hydroxyethyl methacrylate, and 8 parts of isooctyl acrylate into a blender, and stirring for 20 to 30 minutes to obtain a mixed monomer B.

[0074] Example 3

[0075] This embodiment provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0076] 75 parts of deionized water, 13 parts of methyl methacrylate, 6 parts of methyl acrylate, 10 parts of butyl acrylate, 10 parts of isooctyl acrylate, 7 parts of functional monomer (hydroxypropyl methacrylate), 2 parts of diacetone acrylamide, 1 part of anionic emulsifier (fatty alcohol polyoxyethylene ether sulfate), and 1 part of initiator (sodium persulfate).

[0077] This embodiment provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, including steps S001 to S007, wherein steps S003 to S007 are the same as those in embodiment 1.

[0078] Step S001 is: adding 10 parts of deionized water into an emulsifying tank, then adding 1 part of fatty alcohol polyoxyethylene ether sulfate into the emulsifying tank, then starting stirring, and slowly adding 6 parts of hydroxypropyl methacrylate, 5 parts of methyl methacrylate, 10 parts of butyl acrylate, 3 parts of methyl acrylate, and 2 parts of diacetone acrylamide, maintaining stirring for 20 to 30 minutes, to obtain a pre-emulsion A;

[0079] Step S002 is: adding 8 parts of methyl methacrylate, 3 parts of methyl acrylate, 1 part of hydroxypropyl methacrylate, and 10 parts of isooctyl acrylate into a blender, and stirring for 20 to 30 minutes to obtain a mixed monomer B.

[0080] Comparative Example 1

[0081] This comparative example provides a weak solvent inkjet ink resin for outdoor advertising, comprising the following components in parts by weight:

[0082] 75 parts of deionized water, 15 parts of methyl methacrylate, 8 parts of methyl acrylate, 10 parts of butyl acrylate, 10 parts of isooctyl acrylate, 10 parts of functional monomers (methacrylic acid, glycidyl methacrylate), 2 parts of diacetone acrylamide, 1 part of anionic emulsifier (fatty alcohol polyoxyethylene ether sulfate), and 1 part of initiator (sodium persulfate).

[0083] This comparative example provides a method for preparing a weak solvent inkjet ink resin for outdoor advertising, including steps S001 to S007, wherein steps S003 to S007 are the same as those in Example 1.

[0084] Step S001 is: add 10 parts of deionized water into an emulsifying tank, then add 1 part of fatty alcohol polyoxyethylene ether sulfate into the emulsifying tank, then start stirring, and slowly add 7 parts of methacrylic acid, 5 parts of methyl methacrylate, 10 parts of butyl acrylate, 5 parts of methyl acrylate, and 2 parts of glycidyl methacrylate, and maintain stirring for 20 to 30 minutes to obtain pre-emulsion A;

[0085] Step S002 is: adding 10 parts of methyl methacrylate, 3 parts of methyl acrylate, 1 part of methacrylic acid, and 10 parts of isooctyl acrylate into a blender, and stirring for 20 to 30 minutes to obtain a mixed monomer B.

[0086] Examples 1 to 3 and Comparative Example 1 also provide a weak solvent inkjet ink for outdoor advertising, comprising the following components in parts by weight:

[0087] 10 parts of deionized water, 19 parts of moisturizer, 25 parts of propylene glycol methyl ether, 18 parts of isopropyl alcohol, 12 parts of ethylene glycol, 10 parts of inkjet ink resin, 4 parts of color paste, 1.5 parts of surfactant, and 0.5 parts of pH stabilizer.

[0088] The components of the weak solvent inkjet ink for outdoor advertising are stirred and mixed, and after being fully stirred for 20 to 30 minutes, the pH value of the mixed solution is adjusted to 7 to 10, and filtered through a 0.5 to 1 um microporous membrane to prepare the weak solvent inkjet ink for outdoor advertising.

[0089] The performance of the weak solvent inkjet ink for outdoor advertising provided in Examples 1 to 3 and Comparative Example 1 was tested, and the test results are shown in the following table.

[0090]

[0091] In the above table, the wetting performance of inkjet ink on the substrate is tested by the dynamic contact angle method (the dynamic contact angle method evaluates the surface tension by testing the change of the contact angle of inkjet ink on the surface of the material over time, which can accurately reflect the adhesion ability of inkjet ink on the surface of the material). Water resistance is the performance of inkjet ink to maintain color stability, non-fading and non-diffusion when facing water erosion after printing. The stability of inkjet ink is an indicator to measure the smoothness and placement stability of ink printing. In the above table, under the same conditions, the more filtration volume per unit time, the better the fluidity of the ink; after the ink is placed for 3 months, it is filtered again under the same conditions. If the filtration volume is the same as before placement, it proves that the placement stability of the ink is better. Color rendering refers to the ability of ink to present color during the printing process, which is directly related to the color quality of the printed image or text. Sun fastness refers to the ability of inkjet ink to maintain color stability and non-fading under sunlight.

[0092] It can be seen from the test results in the above table that the water resistance of the weak solvent inkjet ink for outdoor advertising provided by Comparative Example 1 is average, not as good as the water resistance of the weak solvent inkjet ink for outdoor advertising provided by Examples 1 to 3. This is because the inkjet ink resin used in Comparative Example 1 does not use a cross-linking monomer and cannot effectively form a tighter network structure, thereby reducing the water resistance of the inkjet ink resin.

[0093] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A weak solvent inkjet ink resin for outdoor advertising, characterized in that: The invention comprises the following components in parts by weight: 70-75 parts of deionized water, 13-15 parts of methyl methacrylate, 5-8 parts of methyl acrylate, 8-12 parts of butyl acrylate, 8-10 parts of isooctyl acrylate, 7-10 parts of functional monomers, 2-3 parts of crosslinking monomers, 0.5-1.5 parts of anionic emulsifiers and 1 part of initiator.

2. The weak solvent inkjet ink resin for outdoor advertising according to claim 1, characterized in that: The functional monomer includes at least one of an acrylic functional monomer and a methacrylic functional monomer.

3. The weak solvent inkjet ink resin for outdoor advertising according to claim 2, characterized in that: The methacrylic functional monomer includes at least one of methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and glycidyl methacrylate.

4. The weak solvent inkjet ink resin for outdoor advertising according to claim 1, characterized in that: The cross-linking monomer includes at least one of a cross-linking monomer HA and a diacetone acrylamide.

5. The weak solvent inkjet ink resin for outdoor advertising according to claim 1, characterized in that: The anionic emulsifier includes at least one of alkyl sulfonates and polyoxyethylene ether sulfates.

6. The weak solvent inkjet ink resin for outdoor advertising according to claim 5, characterized in that: The alkyl sulfonate includes dodecyl sulfonate.

7. The weak solvent inkjet ink resin for outdoor advertising according to claim 6, characterized in that: The polyoxyethylene ether sulfates include fatty alcohol polyoxyethylene ether sulfates.

8. The weak solvent inkjet ink resin for outdoor advertising according to claim 1, characterized in that: The initiator includes at least one of sodium peroxide and sodium persulfate.

9. A method for preparing the weak solvent inkjet ink resin for outdoor advertising according to any one of claims 1 to 8, comprising the following steps: S001. Add deionized water to the emulsifying tank, then add anionic emulsifier to the emulsifying tank, then start stirring, and slowly add a mixture of functional monomer, methyl methacrylate, butyl acrylate, methyl acrylate, and crosslinking monomer, and maintain stirring for 20 to 30 minutes to obtain a pre-emulsion A; S002. The functional monomer, methyl methacrylate, methyl acrylate, butyl acrylate, isooctyl acrylate were added to a blender and stirred for 20 to 30 minutes to obtain a mixed monomer B; S003. The reactor was heated to 80 to 85 ° C, 5% by weight of the pre-emulsion A was added to the reactor, stirred evenly, and then the initiator solution A was added to the reactor, and the temperature was kept for 30 to 35min to completely polymerize the seed monomer in the pre-emulsion A; S004. Control the temperature of the reactor to 78 to 80 ° C, and then dropwise add the remaining pre-emulsion A and initiator solution B; S005. After the pre-emulsion A and the initiator solution B are added dropwise, the reactor is kept warm for 1 hour. After the end of the insulation, the pH value of the material in the reactor is adjusted to 6 to 7; S006. Continue to control the temperature of the reactor at 78 to 80 ° C, and start dropping the mixed monomer B and initiator solution C; S007. After the mixed monomer B and initiator solution C are added dropwise, the reactor is kept warm for 1 hour. After the insulation is completed, the pH value of the material in the reactor is adjusted to 8-9, and then the reactor is cooled down and the material in the reactor is filtered to obtain a weak solvent inkjet ink resin for outdoor advertising.

10. A weak solvent inkjet ink for outdoor advertising, characterized in that: The invention comprises the following components in parts by weight: 10 to 20 parts of deionized water, 10 to 20 parts of moisturizing agent, 20 to 25 parts of propylene glycol methyl ether, 16 to 18 parts of isopropyl alcohol, 8 to 14 parts of ethylene glycol, 10 parts of inkjet ink resin, 3 to 6 parts of color paste, 1 to 2 parts of surfactant and 0.2 to 0.5 parts of pH stabilizer.

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