Moisturizing cleaning fluid suitable for digital ink jet nozzle

Abstract

The invention discloses a moisturizing cleaning solution suitable for a digital ink jet nozzle, and relates to the technical field of cleaning solutions, the moisturizing cleaning solution comprises the following raw materials by mass: 30-50% of polypropylene glycol, 20-30% of propylene carbonate, 0-0.5% of a wetting agent, 0-0.5% of an antifoaming agent, 0-1% of a pH regulator, 0-1% of a bactericide, 0-0.5% of a coloring agent, and the balance deionized water; the addition amount of the wetting agent is not 0; the wetting agent is composed of isopropanol, phosphate esterification bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate according to the mass ratio of 6: (1-3): (1-3). The cleaning fluid provided by the invention can be used for cleaning water-based ink and oil-based ink at the same time, and is excellent in cleaning performance.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning fluid, in particular to a moisturizing cleaning fluid suitable for a digital inkjet nozzle. Background Art

[0002] Inks for digital inkjet printers mainly include water-based inks and oil-based inks. Water-based inks use water and water-soluble solvents as the main components for dissolving color bases and are suitable for most inkjet printers; oil-based inks use non-water-soluble solvents as the main components for dissolving color bases and are suitable for occasions requiring high durability such as gold printing.

[0003] During the use of digital inkjet printers, it is inevitable that ink will remain in the nozzle. After stopping use, the ink remaining in the nozzle may cause the nozzle to be blocked. Therefore, a cleaning fluid that can effectively clean the nozzle is needed.

[0004] Existing cleaning fluids mainly use common moisturizing solvents such as polyols such as glycerin, ethylene glycol, propylene glycol, diethylene glycol, etc., and are combined with fungicides and a small amount of wetting agents and defoaming agents. During the ink change or maintenance of the printhead, a small amount of moisturizing cleaning fluid will be injected to clean the printhead and extend the service life of the printhead. However, the existing cleaning fluid is not very compatible with the ink, and cannot meet the cleaning requirements of both water-based inks and oil-based inks. It also has the problem of poor cleaning performance, requires multiple cleanings, and the printhead test strip cannot be fully passed. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a moisturizing cleaning liquid suitable for digital inkjet nozzles, which can simultaneously meet the cleaning needs of water-based ink and oil-based ink and has excellent cleaning performance.

[0006] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 30-50% of polypropylene glycol, 20-30% of propylene carbonate, 0-0.5% of a wetting agent, 0-0.5% of a defoaming agent, 0-1% of a pH regulator, 0-1% of a bactericide, 0-0.5% of a colorant, and the balance is deionized water;

[0007] The amount of the wetting agent added is not 0;

[0008] The wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate in a mass ratio of 6:1-3:1-3.

[0009] Preferably, the preparation method of the phosphated Bletilla striata polysaccharide is as follows: dissolving Bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain the phosphated Bletilla striata polysaccharide.

[0010] Preferably, the mass ratio of the bletilla striata polysaccharide to sodium polyphosphate is 1:0.3-0.5.

[0011] Preferably, the reaction temperature is 70-90°C and the reaction time is 3-5h.

[0012] Preferably, the preparation method of ethylene glycol glucoside sodium acetate is as follows:

[0013] S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside;

[0014] S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

[0015] Preferably, the molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:6-8:0.2-0.4; the reaction temperature is 80-100° C. and the reaction time is 4-8 hours.

[0016] Preferably, the molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1-1.5, and the amount of sodium hydroxide added is 1-3% of the mass of ethylene glycol glucoside; the reaction temperature is 80-90°C, and the reaction time is 3-7h.

[0017] Preferably, the defoaming agent is one or more of a silicone defoaming agent, a polyether defoaming agent, a polyamide defoaming agent and an organic acid defoaming agent.

[0018] Preferably, the pH adjuster is one or more of citric acid, sodium bicarbonate, triethanolamine, sodium carbonate, sodium hypophosphite and sodium hydroxide.

[0019] Preferably, the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0020] Beneficial technical effects of the present invention:

[0021] The moisturizing cleaning liquid of the present invention has excellent moisturizing and antibacterial properties, and has good compatibility with water-based and oil-based inks, and has universality; a wetting agent is further added to the moisturizing cleaning liquid of the present invention, and the wetting agent consists of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate, which gives the cleaning liquid excellent moisturizing properties, so that the nozzle is still in a moistened state during a long period of non-use, thereby avoiding the phenomenon of dryness and hole blockage on the nozzle surface caused by long-term non-use, and the phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate have a synergistic promoting effect on improving the moisturizing property of the cleaning liquid in the presence of nonylphenol polyoxyethylene ether; the phosphated bletilla striata polysaccharide of the present invention also has a bactericidal effect, and under the joint action of the bactericidal property of the moisturizing cleaning liquid with N-octadecyl-γ-diquaternary ammonium salt, the bactericidal property of the moisturizing cleaning liquid is improved. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with specific embodiments.

[0023] Example 1

[0024] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 40% polypropylene glycol, 25% propylene carbonate, 0.25% wetting agent, 0.25% defoaming agent, 0.5% pH regulator, 0.5% bactericide, and the balance is deionized water;

[0025] The wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate in a mass ratio of 3:1:1.

[0026] The preparation method of phosphated Bletilla striata polysaccharide is as follows: dissolving Bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain phosphated Bletilla striata polysaccharide.

[0027] The mass ratio of bletilla striata polysaccharide to sodium polyphosphate is 1:0.4; the reaction temperature is 80°C and the reaction time is 4h.

[0028] The preparation method of ethylene glycol glucoside sodium acetate is as follows:

[0029] S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside;

[0030] S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

[0031] The molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:7:0.3; the reaction temperature is 90°C and the reaction time is 6h.

[0032] The molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1.2, and the amount of sodium hydroxide added is 2% of the mass of ethylene glycol glucoside; the reaction temperature is 85° C. and the reaction time is 5 h.

[0033] The defoaming agent is an organosilicon defoaming agent, the pH adjusting agent is sodium bicarbonate, and the pH after adjustment is 8; the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0034] Example 2

[0035] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 30% polypropylene glycol, 20% propylene carbonate, 0.1% wetting agent, 0.1% defoaming agent, 0.1% pH regulator, 0.1% bactericide, and the balance is deionized water;

[0036] The wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate in a mass ratio of 6:1:1.

[0037] The preparation method of phosphated Bletilla striata polysaccharide is as follows: dissolving Bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain phosphated Bletilla striata polysaccharide.

[0038] The mass ratio of bletilla striata polysaccharide to sodium polyphosphate is 1:0.3; the reaction temperature is 70°C and the reaction time is 3h.

[0039] The preparation method of ethylene glycol glucoside sodium acetate is as follows:

[0040] S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside;

[0041] S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

[0042] The molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:6:0.2; the reaction temperature is 80°C and the reaction time is 4h.

[0043] The molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1.1, and the amount of sodium hydroxide added is 1% of the mass of ethylene glycol glucoside; the reaction temperature is 80° C. and the reaction time is 3 h.

[0044] The defoaming agent is a polyether defoaming agent; the pH adjusting agent is sodium hydroxide, and the pH after adjustment is 9; and the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0045] Example 3

[0046] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 50% polypropylene glycol, 30% propylene carbonate, 0.5% wetting agent, 0.5% defoaming agent, 1% pH regulator, 1% bactericide, and the balance is deionized water;

[0047] The wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate in a mass ratio of 2:1:1.

[0048] The preparation method of phosphated Bletilla striata polysaccharide is as follows: dissolving Bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain phosphated Bletilla striata polysaccharide.

[0049] The mass ratio of bletilla striata polysaccharide to sodium polyphosphate is 1:0.5; the reaction temperature is 90° C. and the reaction time is 5 h.

[0050] The preparation method of ethylene glycol glucoside sodium acetate is as follows:

[0051] S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside;

[0052] S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

[0053] The molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:8:0.4; the reaction temperature is 95°C and the reaction time is 8h.

[0054] The molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1-1.5, and the amount of sodium hydroxide added is 1-3% of the mass of ethylene glycol glucoside; the reaction temperature is 80-90°C, and the reaction time is 3-7h.

[0055] The defoaming agent is a polyamide defoaming agent; the pH adjusting agent is citric acid, and the pH after adjustment is 7; and the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0056] Comparative Example 1

[0057] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 40% polypropylene glycol, 25% propylene carbonate, 0.25% wetting agent, 0.25% defoaming agent, 0.5% pH regulator, 0.5% bactericide, and the balance is deionized water;

[0058] The wetting agent is composed of nonylphenol polyoxyethylene ether and phosphated bletilla striata polysaccharide in a mass ratio of 3:2.

[0059] The preparation method of phosphated Bletilla striata polysaccharide is as follows: dissolving Bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain phosphated Bletilla striata polysaccharide.

[0060] The mass ratio of bletilla striata polysaccharide to sodium polyphosphate is 1:0.4; the reaction temperature is 80°C and the reaction time is 4h.

[0061] The defoaming agent is an organosilicon defoaming agent, the pH adjusting agent is sodium bicarbonate, and the pH after adjustment is 8; the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0062] Comparative Example 2

[0063] The moisturizing cleaning liquid suitable for a digital inkjet nozzle proposed by the present invention comprises the following raw materials in percentage by mass: 40% polypropylene glycol, 25% propylene carbonate, 0.25% wetting agent, 0.25% defoaming agent, 0.5% pH regulator, 0.5% bactericide, and the balance is deionized water;

[0064] The wetting agent is composed of nonylphenol polyoxyethylene ether and ethylene glycol glucoside sodium acetate in a mass ratio of 3:2.

[0065] The preparation method of ethylene glycol glucoside sodium acetate is as follows:

[0066] S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside;

[0067] S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

[0068] The molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:7:0.3; the reaction temperature is 90°C and the reaction time is 6h.

[0069] The molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1.2, and the amount of sodium hydroxide added is 2% of the mass of ethylene glycol glucoside; the reaction temperature is 85° C. and the reaction time is 5 h.

[0070] The defoaming agent is an organosilicon defoaming agent, the pH adjusting agent is sodium bicarbonate, and the pH after adjustment is 8; the bactericide is N-octadecyl-γ-diquaternary ammonium salt.

[0071] Comparative Example 3

[0072] In this scheme, the phosphated Bletilla striata polysaccharide in Example 1 is replaced by an equal amount of N-octadecyl-γ-diquaternary ammonium salt, and the other conditions are the same as those in Example 1.

[0073] Comparative Example 4

[0074] In this scheme, the N-octadecyl-γ-diquaternary ammonium salt in Example 1 is replaced by an equal amount of phosphated Bletilla striata polysaccharide, and the other conditions are the same as in Example 1.

[0075] The performance of the moisturizing cleaning solutions prepared in Example 1 and Comparative Examples 1-4 were tested, and the test results are shown in Table 1.

[0076] The testing method for cleaning performance is as follows: for each group of tests, 10 clogged nozzles are selected, moisturizing cleaning solution is injected once, and the number of nozzles that can be used normally is recorded. Each group is repeated 3 times, and the nozzles that can be used normally after cleaning are regarded as qualified for cleaning, and the qualified rate is calculated.

[0077] The test method for moisturizing performance is: select 10 nozzles for each test, inject an equal amount of moisturizing cleaning solution, observe whether the nozzles are dry every 5 days, and take the average of the time when drying occurs.

[0078] The test method for antibacterial performance is as follows: inoculate 0.5g of bacterial and fungal culture fluid into the culture medium respectively, then add 30g of moisturizing cleaning fluid, culture at 28°C for 7 days, and record the number of colonies. For each group of tests, select 5 culture media and take the average value of the number of colonies.

[0079] Table 1 Moisturizing cleaning fluid performance test results

[0080]

[0081]

[0082] It can be seen from the test results of Example 1 in Table 1 that the moisturizing cleaning solution prepared by the present invention has excellent moisturizing performance, can maintain the wettability of the nozzle for a long time, and has a good cleaning effect on water-based ink and oil-based ink; it can be seen from the test results of Example 1, Comparative Example 1 and Comparative Example 2 that the wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla polysaccharide and ethylene glycol glucoside sodium acetate, which gives the cleaning solution excellent moisturizing performance, so that the nozzle is still in a moistened state during a long period of non-use, avoiding the phenomenon of drying and pore blocking on the nozzle surface caused by long-term non-use, and phosphated bletilla polysaccharide and ethylene glycol glucoside sodium acetate have a synergistic effect in improving the moisturizing performance of the cleaning solution in the presence of nonylphenol polyoxyethylene ether; it can be seen from the test results of Example 1, Comparative Example 3 and Comparative Example 4 that the phosphated bletilla polysaccharide of the present invention also has a bactericidal effect, and under the synergistic effect with N-octadecyl-γ-diquaternary ammonium salt, the bactericidal performance of the moisturizing cleaning solution is improved.

[0083] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents, and all shall be included in the scope of protection of the present application.

Claims

1. Moisturizing cleaning liquid suitable for digital inkjet printheads, characterized in that: The invention comprises the following raw materials in percentage by mass: 30-50% of polypropylene glycol, 20-30% of propylene carbonate, 0-0.5% of wetting agent, 0-0.5% of defoaming agent, 0-1% of pH adjusting agent, 0-1% of bactericide, 0-0.5% of colorant, and the balance is deionized water; The amount of the wetting agent added is not 0; The wetting agent is composed of nonylphenol polyoxyethylene ether, phosphated bletilla striata polysaccharide and ethylene glycol glucoside sodium acetate in a mass ratio of 6:1-3:1-3.

2. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 1, characterized in that: The preparation method of the phosphated bletilla striata polysaccharide is as follows: dissolving the bletilla striata polysaccharide in deionized water, then sequentially adding sodium sulfate and sodium polyphosphate to react, and after the reaction, performing alcohol precipitation and dialysis to obtain the phosphated bletilla striata polysaccharide.

3. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 2, characterized in that: The mass ratio of the bletilla striata polysaccharide to sodium polyphosphate is 1:0.3-0.

5.

4. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 2, characterized in that: The reaction temperature is 70-90°C and the reaction time is 3-5h.

5. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 1, characterized in that: The preparation method of the ethylene glycol glucoside sodium acetate is as follows: S1: Glucose is added to ethylene glycol, and when the solution becomes colorless, a macroporous strong acid cation exchange resin is added to catalyze the reaction to obtain ethylene glycol glucoside; S2: dissolving ethylene glycol glucoside in n-butanol, and then adding sodium chloroacetate and sodium hydroxide to carry out a second reaction to obtain ethylene glycol glucoside sodium acetate.

6. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 5, characterized in that: The molar ratio of glucose, ethylene glycol and macroporous strong acid cation exchange resin in S1 is 1:6-8:0.2-0.4; the reaction temperature is 80-100°C and the reaction time is 4-8h.

7. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 5, characterized in that: The molar ratio of ethylene glycol glucoside to sodium chloroacetate in S2 is 1:1-1.5, and the amount of sodium hydroxide added is 1-3% of the mass of ethylene glycol glucoside; the reaction temperature is 80-90°C, and the reaction time is 3-7h.

8. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 1, characterized in that: The defoaming agent is one or more of an organosilicon defoaming agent, a polyether defoaming agent, a polyamide defoaming agent and an organic acid defoaming agent.

9. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 1, characterized in that: The pH regulator is one or more of citric acid, sodium bicarbonate, triethanolamine, sodium carbonate, sodium hypophosphite and sodium hydroxide.

10. The moisturizing cleaning liquid suitable for digital inkjet printheads according to claim 1, characterized in that: The bactericide is N-octadecyl-γ-diquaternary ammonium salt.

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