An environmentally friendly water-based ink and its preparation method

Abstract

This invention relates to the field of environmentally friendly water-based ink preparation technology, and discloses an environmentally friendly water-based ink and its preparation method. The method includes raw material preparation, selecting water-based acrylic resin, organic pigments, deionized water, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers; premixing, adding water-based acrylic resin, deionized water, and some environmentally friendly additives to a high-speed disperser, and stirring for 10-20 minutes at a temperature of 20-30℃ and a speed of 500-1000 r / min to form a base material; through the raw material preparation step, water-based acrylic resin, organic pigments, deionized water, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers are selected and pretreated: the resin is preheated, the pigments are sieved, and the water is treated to ensure the uniformity and activity of the raw materials. At the same time, the premixing to form a base material improves the mixing efficiency and lays the foundation for subsequent grinding treatment.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly water-based ink preparation technology, specifically to an environmentally friendly water-based ink and its preparation method. Background Technology

[0002] Water-based ink, also known as water-based ink or flexographic water-based ink, is mainly made of water-soluble resin, organic pigments, solvents and related additives through composite grinding. Water-based ink is particularly suitable for packaging printing products with strict hygiene requirements, such as tobacco, alcohol, food, beverages, pharmaceuticals, and children's toys.

[0003] Currently, in the preparation process of environmentally friendly water-based inks, due to differences in raw material characteristics and insufficient control of process conditions, it is difficult to achieve full compatibility and uniform dispersion of each component during the premixing and grinding stages. If the base material has agglomeration or uneven dispersion, it will lead to a decrease in ink stability and poor color development performance, making it impossible to guarantee the consistency of the final product quality.

[0004] Therefore, an environmentally friendly water-based ink and its preparation method are proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an environmentally friendly water-based ink and its preparation method, solving the problems of decreased ink stability and poor color development performance mentioned in the background art, which makes it impossible to guarantee the consistency of the final product quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing an environmentally friendly water-based ink, comprising the following steps:

[0007] Step 1: Raw material preparation, selecting water-based acrylic resin, organic pigment, deionized water, environmentally friendly additives, biodegradation promoters and ultraviolet absorbers, wherein the solid content of the water-based acrylic resin is 40-50%, the particle size of the organic pigment is 0.1-0.5 micrometers, and the conductivity of the deionized water is less than 10 μS / cm.

[0008] Step 2: Premixing. Add water-based acrylic resin, deionized water, and some environmentally friendly additives to a high-speed disperser and stir for 10-20 minutes at a temperature of 20-30℃ and a speed of 500-1000r / min to form a base material.

[0009] Step 3: Grinding treatment. Mix the base material with organic pigments, biodegradation promoters and ultraviolet absorbers, and grind it using a nano-sand mill. Control the grinding fineness to be less than 5 micrometers, and the grinding time is 30-60 minutes to obtain the initial slurry.

[0010] Step 4: Preparation and formulation. Add the remaining environmentally friendly additives to the initial slurry, stir for 15-25 minutes at a temperature of 25-35℃ and a speed of 200-500r / min, and adjust the pH value to 7.5-8.5 to obtain the water-based ink semi-finished product.

[0011] Step 5: Filtering and packaging. The water-based ink semi-finished product is filtered through a filter with a pore size of 1-5 microns to remove impurities, and then filled into a sealed container and stored in a cool place.

[0012] In step one, the raw materials are prepared according to the following weight ratio: 30-50 parts of water-based acrylic resin, 10-20 parts of organic pigment, 40-60 parts of deionized water, 5-15 parts of environmentally friendly additives, and 3-8 parts of biodegradation promoter and ultraviolet absorber.

[0013] The environmentally friendly additives include wetting agents, defoamers, and leveling agents.

[0014] Preferably, the raw material preparation in step one includes the following sub-steps:

[0015] The water-based acrylic resin was preheated at 25°C for 30 minutes in a constant temperature chamber to reduce its viscosity;

[0016] Organic pigments are sieved through a 200-mesh sieve to remove agglomerated particles;

[0017] Deionized water was placed in an ultrasonic cleaner for 10 minutes to remove dissolved gases.

[0018] The environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers were weighed separately and placed in a dry container for later use.

[0019] Preferably, the premixing in step two specifically involves:

[0020] First, add deionized water to the feed tank of a high-speed disperser, start the agitator and stir at a low speed of 200 r / min, slowly add water-based acrylic resin, and after mixing evenly, add a wetting agent and a defoamer. The wetting agent is alkylphenol polyoxyethylene ether, and the amount added is 30-50% of the total weight of environmentally friendly additives. The defoamer is an organosilicon defoamer, and the amount added is 10-20% of the total weight of environmentally friendly additives.

[0021] Then gradually increase the rotation speed to 500-1000 r / min and stir for 10-20 minutes until the mixture is a homogeneous milky white liquid.

[0022] Preferably, the grinding process in step three uses a nano-grinding mill, wherein the grinding media of the nano-grinding mill is zirconia beads with a particle size of 0.3-0.8 mm and a filling rate of 70-80%.

[0023] During the grinding process, the slurry temperature is controlled below 40℃ and maintained at a constant temperature through a circulating water cooling system.

[0024] The grinding fineness is tested by a scraper fineness gauge and is required to be less than 5 micrometers.

[0025] Preferably, the modulation in step four includes:

[0026] A leveling agent and a UV absorber are added to the initial slurry. The leveling agent is a polyether-modified polysiloxane, and the amount added is 20-30% of the total weight of the environmentally friendly additives. The UV absorber is a benzotriazole compound, and the amount added is 40-60% of the total weight of the biodegradation promoter and the UV absorber.

[0027] Then, use a pH adjuster, which is either ammonia or triethanolamine, at an addition amount of 0.1-0.5% of the total weight of the initial slurry. Stir slowly for 15-25 minutes to stabilize the pH value within the range of 7.5-8.5.

[0028] Preferably, the filter packaging in step five uses a multi-layer filter, including primary filtration and precision filtration:

[0029] The primary filtration uses a stainless steel screen with a 10-micron aperture to remove larger particles.

[0030] Precision filtration uses polypropylene filter membranes with a pore size of 1-5 micrometers and an operating pressure of 0.1-0.3 MPa;

[0031] The filtered ink is filled into polyethylene plastic bottles or aluminum foil bags, filled with nitrogen for protection, and sealed and stored in an environment with a temperature of 15-25℃ and a humidity of less than 50%.

[0032] Preferably, the biodegradation promoter is prepared by the following method:

[0033] Collect plant straw or starchy agricultural waste, crush it to a particle size of 100-200 micrometers, and mix it with a microbial agent containing Bacillus subtilis and Aspergillus niger. The amount of microbial agent added is 5-10% of the weight of the waste.

[0034] Ferment at 35-45℃ for 5-7 days. The fermentation product is centrifuged, dried and ground into powder to obtain a biodegradation promoter.

[0035] Preferably, the activation step of the microbial agent is as follows:

[0036] Bacillus subtilis and Aspergillus niger were inoculated into nutrient broth medium and cultured at 30°C and 150 rpm for 24 hours to achieve a bacterial concentration of 10. 8 CFU / mL;

[0037] Then mix them at a volume ratio of 1:1 to obtain the microbial inoculant.

[0038] Preferably, after the mixing and preparation in step four and before the filtering and packaging in step five, an additional maturation step is added:

[0039] Transfer the prepared water-based ink semi-finished product to a sealed curing tank, and stir slowly at 20-50 r / min for 2-4 hours at 25-35℃, then let it stand and cure for 12-24 hours.

[0040] An environmentally friendly water-based ink, wherein the ink is a homogeneous and stable liquid composition, the components of which include a continuous phase formed of water-based acrylic resin, a dispersed phase in which organic pigments are uniformly dispersed at a particle size of nano to micron, and an auxiliary phase in which environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers are dissolved or adsorbed in molecular form at the interface between the continuous phase and the dispersed phase.

[0041] Compared with the prior art, the present invention provides an environmentally friendly water-based ink and its preparation method, which has the following beneficial effects:

[0042] 1. In this invention, through the raw material preparation step, water-based acrylic resin, organic pigment, deionized water, environmentally friendly additives, biodegradation promoters and ultraviolet absorbers are selected and pretreated: the resin is preheated, the pigment is sieved and the water is treated to ensure the uniformity and activity of the raw materials. At the same time, the base material is formed by premixing to improve the mixing efficiency and lay the foundation for subsequent grinding.

[0043] 2. In this invention, the grinding fineness is controlled by grinding treatment and constant temperature is maintained to ensure uniform pigment dispersion. At the same time, the leveling agent and ultraviolet absorber are added by formulation and the pH value is adjusted to improve the leveling and weather resistance of the ink. The ink performance is stabilized by the curing step.

[0044] 3. In this invention, impurities are removed by using a multi-layer filter in the filtration packaging, and nitrogen gas is used for protective and sealed storage to ensure the purity and storage stability of the ink. At the same time, a biodegradation promoter, which is made from agricultural waste through microbial fermentation, is added to enhance the biodegradability of the ink and reflect its environmental protection characteristics. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1: A method for preparing an environmentally friendly water-based ink, comprising the following steps:

[0047] Step 1: Raw material preparation. Select water-based acrylic resin, organic pigment, deionized water, environmentally friendly additives, biodegradation promoters and ultraviolet absorbers. The solid content of the water-based acrylic resin is 40%, the particle size of the organic pigment is 0.1 micrometers, and the conductivity of the deionized water is less than 10 μS / cm.

[0048] Step 2: Premixing. Add water-based acrylic resin, deionized water, and some environmentally friendly additives to a high-speed disperser and stir for 10 minutes at 20°C and 500 rpm to form a base material.

[0049] Step 3: Grinding treatment. Mix the base material with organic pigments, biodegradation promoters and ultraviolet absorbers, and grind it using a nano-sand mill. Control the grinding fineness to be less than 5 micrometers and the grinding time to be 30 minutes to obtain the initial slurry.

[0050] Step 4: Preparation and formulation. Add the remaining environmentally friendly additives to the initial slurry, stir for 15 minutes at 25℃ and 200r / min, and adjust the pH value to 7.5 to obtain the water-based ink semi-finished product.

[0051] Step 5: Filtering and packaging. The water-based ink semi-finished product is filtered through a filter with a pore size of 1 micron to remove impurities, and then filled into a sealed container and stored in a cool place.

[0052] In step one, the raw materials are prepared according to the following weight ratio: 30 parts water-based acrylic resin, 10 parts organic pigment, 40 parts deionized water, 5 parts environmentally friendly additives, and 3 parts biodegradation promoter and ultraviolet absorber.

[0053] Environmentally friendly additives include wetting agents, defoamers, and leveling agents.

[0054] Step one, raw material preparation, includes the following sub-steps:

[0055] The water-based acrylic resin was preheated at 25°C for 30 minutes in a constant temperature chamber to reduce its viscosity;

[0056] Organic pigments are sieved through a 200-mesh sieve to remove agglomerated particles;

[0057] Deionized water was placed in an ultrasonic cleaner for 10 minutes to remove dissolved gases.

[0058] The environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers were weighed separately and placed in a dry container for later use.

[0059] The premixing in step two specifically involves:

[0060] First, add deionized water to the feed tank of the high-speed disperser, start the agitator and stir at a low speed of 200 r / min, slowly add water-based acrylic resin, and after mixing evenly, add wetting agent and defoamer. The wetting agent is alkylphenol polyoxyethylene ether, and the addition amount is 30% of the total weight of environmentally friendly additives. The defoamer is an organosilicon defoamer, and the addition amount is 10% of the total weight of environmentally friendly additives.

[0061] Then gradually increase the speed to 500 r / min and stir for 10 minutes until the mixture is a homogeneous milky white liquid.

[0062] The grinding process in step three uses a nano-grinding mill. The grinding media of the nano-grinding mill are zirconia beads with a particle size of 0.3 mm and a filling rate of 70%.

[0063] During the grinding process, the slurry temperature is controlled below 40℃ and maintained at a constant temperature through a circulating water cooling system.

[0064] The grinding fineness is tested by a scraper fineness gauge and is required to be less than 5 micrometers.

[0065] Step four, the blending and modulation, includes:

[0066] A leveling agent and a UV absorber are added to the initial slurry. The leveling agent is a polyether-modified polysiloxane, and the amount added is 20% of the total weight of the environmentally friendly additives. The UV absorber is a benzotriazole compound, and the amount added is 40% of the total weight of the biodegradation promoter and the UV absorber.

[0067] Then use a pH adjuster, either ammonia or triethanolamine, at a rate of 0.1% of the total weight of the initial pulp, and stir slowly for 15 minutes to stabilize the pH at 7.5.

[0068] The filter packaging in step five uses a multi-layer filter, including primary filtration and precision filtration:

[0069] The primary filtration uses a stainless steel screen with a 10-micron aperture to remove larger particles.

[0070] Precision filtration uses a polypropylene filter membrane with a pore size of 1 micrometer and an operating pressure of 0.1 MPa;

[0071] The filtered ink is filled into polyethylene plastic bottles or aluminum foil bags, filled with nitrogen for protection, and sealed and stored in an environment with a temperature of 15°C and a humidity of less than 50%.

[0072] The biodegradation promoter is prepared by the following method:

[0073] Collect plant straw or starchy agricultural waste, crush it to a particle size of 100 micrometers, and mix it with a microbial agent containing Bacillus subtilis and Aspergillus niger. The amount of microbial agent added is 5% of the weight of the waste.

[0074] Fermentation was carried out at 35℃ for 5 days. The fermentation product was centrifuged, dried and ground into powder to obtain a biodegradation promoter.

[0075] The activation steps for microbial agents are as follows:

[0076] Bacillus subtilis and Aspergillus niger were inoculated into nutrient broth medium and cultured at 30°C and 150 rpm for 24 hours to achieve a bacterial concentration of 10. 8 CFU / mL;

[0077] Then mix them at a volume ratio of 1:1 to obtain the microbial inoculant.

[0078] After the preparation and blending in step four and before the filtering and packaging in step five, an additional maturation step is added:

[0079] The prepared water-based ink semi-finished product is transferred to a sealed curing tank and stirred slowly at 20 r / min for 2 hours at 25°C, and then allowed to stand for curing for 12 hours.

[0080] An environmentally friendly water-based ink is a homogeneous and stable liquid composition. Its components include a continuous phase formed by water-based acrylic resin, a dispersed phase in which organic pigments are uniformly dispersed at the nano to micron particle size, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers are dissolved or adsorbed in molecular form at the interface between the continuous phase and the dispersed phase.

[0081] Example 2: A method for preparing an environmentally friendly water-based ink, comprising the following steps:

[0082] Step 1: Raw material preparation. Select water-based acrylic resin, organic pigment, deionized water, environmentally friendly additives, biodegradation promoters and ultraviolet absorbers. The solid content of the water-based acrylic resin is 45%, the particle size of the organic pigment is 0.3 micrometers, and the conductivity of the deionized water is less than 10 μS / cm.

[0083] Step 2: Premixing. Add water-based acrylic resin, deionized water, and some environmentally friendly additives to a high-speed disperser and stir for 15 minutes at 25°C and 750 r / min to form a base material.

[0084] Step 3: Grinding treatment. Mix the base material with organic pigments, biodegradation promoters and ultraviolet absorbers, and grind it using a nano-sand mill. Control the grinding fineness to be less than 5 micrometers and the grinding time to be 45 minutes to obtain the initial slurry.

[0085] Step 4: Preparation and formulation. Add the remaining environmentally friendly additives to the initial slurry, stir for 20 minutes at 30℃ and 350r / min, and adjust the pH value to 8.0 to obtain the water-based ink semi-finished product.

[0086] Step 5: Filtering and packaging. The water-based ink semi-finished product is filtered through a filter with a pore size of 3 microns to remove impurities, and then filled into a sealed container and stored in a cool place.

[0087] In step one, the raw materials are prepared according to the following weight ratio: 40 parts water-based acrylic resin, 15 parts organic pigment, 50 parts deionized water, 10 parts environmentally friendly additives, and 5 parts biodegradation promoter and ultraviolet absorber.

[0088] Environmentally friendly additives include wetting agents, defoamers, and leveling agents.

[0089] Step one, raw material preparation, includes the following sub-steps:

[0090] The water-based acrylic resin was preheated at 25°C for 30 minutes in a constant temperature chamber to reduce its viscosity;

[0091] Organic pigments are sieved through a 200-mesh sieve to remove agglomerated particles;

[0092] Deionized water was placed in an ultrasonic cleaner for 10 minutes to remove dissolved gases.

[0093] The environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers were weighed separately and placed in a dry container for later use.

[0094] The premixing in step two specifically involves:

[0095] First, add deionized water to the feed tank of the high-speed disperser, start the agitator and stir at a low speed of 200 r / min, slowly add water-based acrylic resin, and after mixing evenly, add wetting agent and defoamer. The wetting agent is alkylphenol polyoxyethylene ether, and the addition amount is 40% of the total weight of environmentally friendly additives. The defoamer is an organosilicon defoamer, and the addition amount is 15% of the total weight of environmentally friendly additives.

[0096] Then gradually increase the speed to 750 r / min and stir for 15 minutes until the mixture is a homogeneous milky white liquid.

[0097] The grinding process in step three uses a nano-grinding mill. The grinding media of the nano-grinding mill are zirconia beads with a particle size of 0.5 mm and a filling rate of 75%.

[0098] During the grinding process, the slurry temperature is controlled below 40℃ and maintained at a constant temperature through a circulating water cooling system.

[0099] The grinding fineness is tested by a scraper fineness gauge and is required to be less than 5 micrometers.

[0100] Step four, the blending and modulation, includes:

[0101] A leveling agent and a UV absorber are added to the initial slurry. The leveling agent is a polyether-modified polysiloxane, and the amount added is 25% of the total weight of the environmentally friendly additives. The UV absorber is a benzotriazole compound, and the amount added is 50% of the total weight of the biodegradation promoter and the UV absorber.

[0102] Then use a pH adjuster, either ammonia or triethanolamine, at a rate of 0.3% of the total weight of the initial slurry. Stir slowly for 20 minutes to stabilize the pH at 8.0.

[0103] The filter packaging in step five uses a multi-layer filter, including primary filtration and precision filtration:

[0104] The primary filtration uses a stainless steel screen with a 10-micron aperture to remove larger particles.

[0105] Precision filtration uses a polypropylene filter membrane with a pore size of 3 micrometers and an operating pressure of 0.2 MPa;

[0106] The filtered ink is filled into polyethylene plastic bottles or aluminum foil bags, filled with nitrogen for protection, and sealed and stored in an environment with a temperature of 20°C and a humidity of less than 50%.

[0107] The biodegradation promoter is prepared by the following method:

[0108] Collect plant straw or starchy agricultural waste, crush it to a particle size of 150 micrometers, and mix it with a microbial agent containing Bacillus subtilis and Aspergillus niger. The amount of microbial agent added is 7% of the weight of the waste.

[0109] Fermentation was carried out at 40℃ for 6 days. The fermentation product was centrifuged, dried and ground into powder to obtain a biodegradation promoter.

[0110] The activation steps for microbial agents are as follows:

[0111] Bacillus subtilis and Aspergillus niger were inoculated into nutrient broth medium and cultured at 30°C and 150 rpm for 24 hours to achieve a bacterial concentration of 10. 8 CFU / mL;

[0112] Then mix them at a volume ratio of 1:1 to obtain the microbial inoculant.

[0113] After the preparation and blending in step four and before the filtering and packaging in step five, an additional maturation step is added:

[0114] The prepared water-based ink semi-finished product is transferred to a sealed curing tank and stirred slowly at 35 r / min for 3 hours at 30°C, and then allowed to stand for curing for 18 hours.

[0115] An environmentally friendly water-based ink is a homogeneous and stable liquid composition. Its components include a continuous phase formed by water-based acrylic resin, a dispersed phase in which organic pigments are uniformly dispersed at the nano to micron particle size, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers are dissolved or adsorbed in molecular form at the interface between the continuous phase and the dispersed phase.

[0116] Example 3: A method for preparing an environmentally friendly water-based ink, comprising the following steps:

[0117] Step 1: Raw material preparation. Select water-based acrylic resin, organic pigment, deionized water, environmentally friendly additives, biodegradation promoters and ultraviolet absorbers. The solid content of the water-based acrylic resin is 50%, the particle size of the organic pigment is 0.5 micrometers, and the conductivity of the deionized water is less than 10 μS / cm.

[0118] Step 2: Premixing. Add water-based acrylic resin, deionized water, and some environmentally friendly additives to a high-speed disperser and stir for 20 minutes at 30°C and 1000 r / min to form a base material.

[0119] Step 3: Grinding treatment. Mix the base material with organic pigments, biodegradation promoters and ultraviolet absorbers, and grind it using a nano-sand mill. Control the grinding fineness to be less than 5 micrometers and the grinding time to be 60 minutes to obtain the initial slurry.

[0120] Step 4: Preparation and formulation. Add the remaining environmentally friendly additives to the initial slurry, stir for 25 minutes at 35℃ and 500r / min, and adjust the pH value to 8.5 to obtain the water-based ink semi-finished product.

[0121] Step 5: Filtering and packaging. The water-based ink semi-finished product is filtered through a filter with a pore size of 5 microns to remove impurities, and then filled into a sealed container and stored in a cool place.

[0122] In step one, the raw materials are prepared according to the following weight ratio: 50 parts water-based acrylic resin, 20 parts organic pigment, 60 parts deionized water, 15 parts environmentally friendly additives, and 8 parts biodegradation promoter and ultraviolet absorber.

[0123] Environmentally friendly additives include wetting agents, defoamers, and leveling agents.

[0124] Step one, raw material preparation, includes the following sub-steps:

[0125] The water-based acrylic resin was preheated at 25°C for 30 minutes in a constant temperature chamber to reduce its viscosity;

[0126] Organic pigments are sieved through a 200-mesh sieve to remove agglomerated particles;

[0127] Deionized water was placed in an ultrasonic cleaner for 10 minutes to remove dissolved gases.

[0128] The environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers were weighed separately and placed in a dry container for later use.

[0129] The premixing in step two specifically involves:

[0130] First, add deionized water to the feed tank of the high-speed disperser, start the agitator and stir at a low speed of 200 r / min, slowly add water-based acrylic resin, and after mixing evenly, add wetting agent and defoamer. The wetting agent is alkylphenol polyoxyethylene ether, and the addition amount is 50% of the total weight of environmentally friendly additives. The defoamer is an organosilicon defoamer, and the addition amount is 20% of the total weight of environmentally friendly additives.

[0131] Then gradually increase the speed to 1000 r / min and stir for 20 minutes until the mixture is a homogeneous milky white liquid.

[0132] The grinding process in step three uses a nano-grinding mill. The grinding media of the nano-grinding mill are zirconia beads with a particle size of 0.8 mm and a filling rate of 80%.

[0133] During the grinding process, the slurry temperature is controlled below 40℃ and maintained at a constant temperature through a circulating water cooling system.

[0134] The grinding fineness is tested by a scraper fineness gauge and is required to be less than 5 micrometers.

[0135] Step four, the blending and modulation, includes:

[0136] A leveling agent and a UV absorber are added to the initial slurry. The leveling agent is a polyether-modified polysiloxane, and the amount added is 30% of the total weight of the environmentally friendly additives. The UV absorber is a benzotriazole compound, and the amount added is 60% of the total weight of the biodegradation promoter and the UV absorber.

[0137] Then use a pH adjuster, either ammonia or triethanolamine, at a rate of 0.5% of the total weight of the initial slurry. Stir slowly for 25 minutes to stabilize the pH at 8.5.

[0138] The filter packaging in step five uses a multi-layer filter, including primary filtration and precision filtration:

[0139] The primary filtration uses a stainless steel screen with a 10-micron aperture to remove larger particles.

[0140] Precision filtration uses a polypropylene filter membrane with a pore size of 5 micrometers and an operating pressure of 0.3 MPa;

[0141] The filtered ink is filled into polyethylene plastic bottles or aluminum foil bags, filled with nitrogen for protection, and sealed and stored in an environment with a temperature of 25°C and a humidity of less than 50%.

[0142] The biodegradation promoter is prepared by the following method:

[0143] Collect plant straw or starchy agricultural waste, crush it to a particle size of 200 micrometers, and mix it with a microbial agent containing Bacillus subtilis and Aspergillus niger. The amount of microbial agent added is 10% of the weight of the waste.

[0144] Fermentation was carried out at 45℃ for 7 days. The fermentation product was centrifuged, dried and ground into powder to obtain a biodegradation promoter.

[0145] The activation steps for microbial agents are as follows:

[0146] Bacillus subtilis and Aspergillus niger were inoculated into nutrient broth medium and cultured at 30°C and 150 rpm for 24 hours to achieve a bacterial concentration of 10. 8 CFU / mL;

[0147] Then mix them at a volume ratio of 1:1 to obtain the microbial inoculant.

[0148] After the preparation and blending in step four and before the filtering and packaging in step five, an additional maturation step is added:

[0149] The prepared water-based ink semi-finished product is transferred to a sealed curing tank and stirred slowly at 50 r / min for 4 hours at 35°C, followed by standing curing for 24 hours.

[0150] An environmentally friendly water-based ink is a homogeneous and stable liquid composition. Its components include a continuous phase formed by water-based acrylic resin, a dispersed phase in which organic pigments are uniformly dispersed at the nano to micron particle size, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers are dissolved or adsorbed in molecular form at the interface between the continuous phase and the dispersed phase.

[0151] Comparative Example 1 differs from Example 1 in that no biodegradation promoters or ultraviolet absorbers were added during the preparation of the environmentally friendly water-based ink in this comparative example.

[0152] Comparative Example 2 differs from Example 1 in that no environmentally friendly additives were added during the preparation of the environmentally friendly water-based ink.

[0153] Comparative Example 3 differs from Example 1 in that no grinding process was performed in this comparative example.

[0154] Comparative Example 4 differs from Example 1 in that it was not filtered and packaged.

[0155] The environmentally friendly water-based inks prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests. The test items and test methods are as follows:

[0156] Fineness test: Use a scraper fineness meter to measure the grinding fineness of the ink;

[0157] pH test: Use a pH meter to measure the pH value of the ink;

[0158] Viscosity testing: The viscosity of the ink is measured using a rotational viscometer.

[0159] Storage stability test: The ink was stored in a 40℃ constant temperature chamber for 7 days and observed for whether it separated into layers or precipitated.

[0160] The test data of the environmentally friendly water-based inks prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below:

[0161]

[0162] By comparing and analyzing the data in the table, it can be seen that the environmentally friendly water-based inks prepared using the processes in Examples 1-3 have significantly better performance than those prepared using the processes in Comparative Examples 1-4. This indicates that the present invention, through the raw material preparation steps, selects water-based acrylic resin, organic pigments, deionized water, environmentally friendly additives, biodegradation promoters, and ultraviolet absorbers, and performs pretreatment: preheating the resin, sieving the pigments, and treating the water to ensure the uniformity and activity of the raw materials. At the same time, premixing forms a base material, improving mixing efficiency and laying the foundation for subsequent grinding. Through grinding, the fineness of the grinding is controlled and a constant temperature is maintained to ensure uniform pigment dispersion. At the same time, by adjusting the formulation and adding leveling agents and ultraviolet absorbers and adjusting the pH value, the leveling and weather resistance of the ink are improved. The curing step stabilizes the ink performance. Through filtration and packaging, multi-layer filters are used to remove impurities, and nitrogen is used for protective and sealed storage to ensure the purity and storage stability of the ink. At the same time, by adding biodegradation promoters, which are obtained from agricultural waste through microbial fermentation, the biodegradability of the ink is enhanced, reflecting its environmental protection characteristics.

[0163] By comparing and analyzing the relevant data in the table, it can be seen that the environmentally friendly water-based ink prepared by the process of this invention has good fineness, pH stability, viscosity and storage stability.

[0164] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0165] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an environmentally friendly water-based ink, characterized by: The method comprises the following steps: Step 1: raw material preparation, select water-based acrylic resin, organic pigment, deionized water, environmental protection auxiliary agent, biodegradation accelerator and ultraviolet absorber, wherein the solid content of the water-based acrylic resin is 40-50%, the particle size of the organic pigment is 0.1-0.5 microns, and the conductivity of the deionized water is less than 10 μS / cm; The biodegradation accelerator is prepared by the following method: Collect plant straw or starch agricultural waste, crush to a particle size of 100-200 microns, mix with microbial inoculum, the microbial inoculum contains bacillus subtilis and aspergillus niger, the microbial inoculum is added in an amount of 5-10% of the weight of the waste; Ferment at 35-45℃ for 5-7 days, centrifuge, dry and grind into powder to obtain the biodegradation accelerator; Step 2: premixing, add water-based acrylic resin, deionized water and part of environmental protection auxiliary agent into a high-speed disperser, stir at a temperature of 20-30℃ and a speed of 500-1000 r / min for 10-20 minutes to form a base; Step 3: grinding treatment, mix the base with organic pigment, biodegradation accelerator and ultraviolet absorber, and grind with a nano sand mill, control the grinding fineness to be less than 5 microns, and the grinding time is 30-60 minutes to obtain a primary slurry; Step 4: adjust the temperature to 25-35℃ and the speed to 200-500 r / min, and stir for 15-25 minutes to adjust the pH value to 7.5-8.5 to obtain a water-based ink semi-finished product; Step 5: filter and package, filter the water-based ink semi-finished product through a filter with a pore size of 1-5 microns to remove impurities, and fill it into a sealed container for storage in a cool place; In step 1, the raw materials are prepared in the following proportions by weight: water-based acrylic resin 30-50 parts, organic pigment 10-20 parts, deionized water 40-60 parts, environmental protection auxiliary agent 5-15 parts, biodegradation accelerator and ultraviolet absorber 3-8 parts; The environmental protection auxiliary agent includes wetting agent, defoaming agent and leveling agent.

2. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The raw material preparation in step 1 includes the following sub-steps: Preheat the water-based acrylic resin in an incubator at 25℃ for 30 minutes to reduce the viscosity; Screen the organic pigment through a 200-mesh screen to remove agglomerated particles; Place the deionized water in an ultrasonic cleaner for 10 minutes to remove dissolved gases; Weigh the environmental protection auxiliary agent, biodegradation accelerator and ultraviolet absorber separately and place them in a dry container for later use.

3. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The premixing in step 2 is as follows: First, add deionized water into the trough of the high-speed disperser, start the stirrer at a low speed of 200 r / min, slowly add water-based acrylic resin, and after mixing evenly, add wetting agent and defoaming agent, the wetting agent uses alkyl phenol polyoxyethylene ether, the addition amount is 30-50% of the total weight of the environmental protection auxiliary agent, the defoaming agent uses silicone defoaming agent, the addition amount is 10-20% of the total weight of the environmental protection auxiliary agent; Then gradually increase the speed to 500-1000 r / min, stir for 10-20 minutes, until the mixture is a uniform milky white liquid.

4. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The grinding treatment in step three adopts a nanometer sand mill, the grinding medium of which is zirconium oxide beads with a particle size of 0.3-0.8 mm and a filling rate of 70-80%; During the grinding process, the temperature of the slurry is controlled to be lower than 40°C, and a circulating water cooling system is used to maintain the constant temperature; The grinding fineness is detected by a doctor blade fineness meter and is required to be less than 5 microns.

5. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The preparation and modulation in step four include: A leveling agent and an ultraviolet absorber are added to the primary slurry, the leveling agent being a polyether-modified polysiloxane with an addition amount of 20-30% of the total weight of the environmental protection additives, and the ultraviolet absorber being a benzotriazole compound with an addition amount of 40-60% of the total weight of the biodegradation promoters and the ultraviolet absorber; Then, a pH regulator is used, which is one of ammonia water or triethanolamine, with an addition amount of 0.1-0.5% of the total weight of the primary slurry, and slow stirring for 15-25 minutes to stabilize the pH value in the range of 7.5-8.

5.

6. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The filtration and packaging in step five adopt a multi-layer filter, including primary filtration and precision filtration: The primary filtration uses a stainless steel screen with a pore size of 10 microns to remove larger particles; The precision filtration uses a polypropylene filter membrane with a pore size of 1-5 microns and an operating pressure of 0.1-0.3 MPa; The filtered ink is filled into a polyethylene plastic bottle or an aluminum foil bag, filled with nitrogen for protection, and sealed and stored in an environment with a temperature of 15-25°C and a humidity of less than 50%.

7. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: The activation step of the microbial agent is: The Bacillus subtilis and Aspergillus niger were inoculated into nutrient broth medium respectively, and cultured at 30°C, 150 r / min for 24 hours to make the concentration of the bacterial solution reach 10 8 CFU / mL; Then, mixing at a volume ratio of 1:1 to obtain the microbial agent.

8. The method for preparing an environmentally friendly water-based ink according to claim 1, characterized in that: After the preparation and modulation in step four and before the filtration and packaging in step five, a curing step is added: The prepared water-based ink semi-finished product is transferred to a sealed curing tank, and continuously stirred slowly at a speed of 20-50 r / min for 2-4 hours in an environment at 25-35°C, and then left to cure for 12-24 hours.

9. An environmentally friendly water-based ink prepared by the method of any one of claims 1-8, characterized in that: The ink is a uniform and stable liquid composition, the components of which include a continuous phase formed by a water-based acrylic resin, a dispersed phase in which organic pigments are uniformly dispersed in nanometer to micrometer size, an auxiliary phase in which environmental protection additives, biodegradation promoters and ultraviolet absorbers are dissolved or adsorbed in molecular form at the interface between the continuous phase and the dispersed phase.

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