A tableware drying agent and its preparation method

Abstract

This invention proposes a tableware drying agent and its preparation method, belonging to the technical field of washing drying agents. Based on a total mass content of 100%, the tableware drying agent comprises 10-14% defoamer, 2-5% surfactant, 2-4% solubilizer, 0.1-0.5% bactericide, 0.1-1% pH adjuster, 0.5-1% sodium polyacrylate, and the balance being water. The defoamer is a mixture of tannic acid polyether and modified polydopamine@silica, with a mass ratio of 10:3-5. This tableware drying agent uses bio-based raw materials as components, exhibiting good drying effect, good biodegradability, excellent defoaming effect, and the addition of a food-grade antibacterial agent, making it safer and more environmentally friendly, baby-friendly, and enhancing stain removal, reducing scale formation, and solving the problem of children's tableware leaving a bitter taste. It has broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of washing and drying agents, specifically to a tableware drying agent and its preparation method. Background Technology

[0002] A dishwasher is a device that automatically cleans tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Compared to hand washing, automatic dishwashers offer advantages such as saving time and effort, strong cleaning power, ease of operation, and energy and water conservation. They are widely used in canteens of hotels, restaurants, government agencies, schools, factories, and other institutions. Current dishwashers typically have soaking, pre-wash, main wash, rinsing, sanitizing, and drying programs. The pre-wash and main wash remove large pieces of food residue and grease; the rinsing removes residue and the solutions used in the pre-wash and main wash; sanitizing disinfects tableware after daily use to prevent bacterial growth; and drying dries the sanitized tableware. During use, a drying agent is added to the rinsing solution to reduce the interfacial tension between the liquid and solid, allowing the rinsing solution to flow quickly and evenly down the surface of the tableware in a thin, uniform curtain-like pattern, significantly reducing spots and films on the tableware and accelerating drying.

[0003] In the prior art, the drying agent is composed of surfactant: fatty alcohol polyoxyethylene ether, surfactant solubilizer: lower alcohol, pigment, preservative and deionized water. The main role of the surfactant in the drying agent is to reduce the surface energy of the vessel or reduce the interfacial tension between the liquid and the solid, so that the rinsing solution can flow down the surface of the vessel quickly in a uniform thin water curtain, thereby reducing the formation of spots and films on the vessel and the drying rate of the vessel is faster.

[0004] The aforementioned drying agent produces relatively small amounts of foam, but it still accumulates and generates a large amount of foam during the rinsing process. In addition to reducing the effectiveness of the drying agent, the accumulation of foam may also overflow into the machinery, affecting its operation and normal use. Therefore, there is an urgent need to develop a drying agent that can not only ensure the drying effect but also prevent the generation of foam during the rinsing process. Summary of the Invention

[0005] The purpose of this invention is to propose a tableware drying agent and its preparation method. Using bio-based raw materials as components, it has a good drying effect, good biodegradability, excellent defoaming effect, and the addition of food-grade antibacterial agent, making it safer and more environmentally friendly, baby-friendly, and also enhancing the stain removal effect, reducing the formation of limescale, and solving the problem of children's tableware being "bitter to the touch". It has broad application prospects.

[0006] The technical solution of this invention is implemented as follows:

[0007] This invention provides a tableware drying agent, which, based on a total mass content of 100%, comprises 10-14% defoamer, 2-5% surfactant, 2-4% solubilizer, 0.1-0.5% bactericide, 0.1-1% pH adjuster, 0.5-1% sodium polyacrylate, and the balance being water. The defoamer is a mixture of tannic acid polyether and modified polydopamine@silica in a mass ratio of 10:3-5.

[0008] As a further improvement of the present invention, the surfactant is a mixture of nonionic surfactant and anionic surfactant in a mass ratio of 5-10:2-4, wherein the nonionic surfactant is selected from at least one of alkyl glycosides, sophorolipids, and rhamnolipids; and the anionic surfactant is selected from at least one of fatty alcohol polyoxyethylene ether sulfate salts and sodium cocoyl oxyethyl sulfonate.

[0009] As a further improvement of the present invention, the preparation method of the tannic acid polyether is as follows:

[0010] Tannic acid and catalyst are mixed, and under inert gas protection and high temperature and reduced pressure conditions, a mixture of propylene oxide and ethylene oxide is introduced and stirred to react. When the pressure in the reactor drops back to the initial pressure, propylene oxide is introduced and the reaction is continued at a constant temperature. When the pressure in the reactor drops back to the initial pressure, the temperature is lowered and a vacuum is drawn, and then the temperature is lowered to room temperature to obtain tannic acid polyether.

[0011] As a further improvement of the present invention, the catalyst is a bimetallic cyanide complex DMC, the amount of catalyst added is 1-2 wt% of the mass of tannic acid, the high-temperature decompression temperature is 155-165℃, the pressure is 0.1-0.15 MPa, the mass ratio of propylene oxide to ethylene oxide in the mixture of propylene oxide and ethylene oxide is 10:5-7, and the cooling and vacuuming temperature is 125-135℃, and the time is 0.5-1.5 h.

[0012] As a further improvement of the present invention, the preparation method of the modified polydopamine@silica is as follows:

[0013] S1. Preparation of polydopamine-modified silica nanospheres: Add nano-silica to Tris-HCl solution, add dopamine hydrochloride, heat and stir to react, centrifuge, wash, and dry to obtain polydopamine-modified silica nanospheres.

[0014] S2. Preparation of modified polydopamine@silica: Polydopamine-modified silica nanospheres and monomeric alkyl isocyanate were added to a solvent, a catalyst was added, the mixture was stirred at room temperature, centrifuged, washed, and dried to obtain modified polydopamine@silica.

[0015] As a further improvement of the present invention, the average particle size of the nano-silica in step S1 is 100-200 nm, the mass ratio of the nano-silica to dopamine hydrochloride is 10:3-5, the pH value of the Tris-HCl solution is 8.5-9.5, the temperature of the heating and stirring reaction is 45-55°C, and the time is 3-5 h.

[0016] As a further improvement of the present invention, in step S2, the mass ratio of polydopamine-modified silica nanospheres to monomeric alkyl isocyanate is 10:2-4, wherein the monomeric alkyl isocyanate is selected from at least one of cyclohexyl isocyanate, dodecyl isocyanate, and octadecyl isocyanate, the catalyst is dibutyltin dilaurate, the amount of catalyst added is 2-3 wt% of the mass of polydopamine-modified silica nanospheres, the stirring time at room temperature is 7-9 h, and the solvent is 1,4-dioxane or acetone.

[0017] As a further improvement of the present invention, the solubilizer is selected from at least one of sodium isopropylbenzenesulfonate, sodium xylenesulfonate, and xylenesulfonate amine; the bactericide is selected from at least one of natamycin and nisin; and the pH adjuster is at least one of citric acid, lactic acid, malic acid, and sodium citrate.

[0018] This invention further protects a method for preparing the above-mentioned tableware drying agent, comprising the following steps:

[0019] (2) Add the surfactant and solubilizer to the water and stir to mix;

[0020] (2) Add all components except sodium polyacrylate to the system in step (1) and stir to mix;

[0021] (3) Add sodium polyacrylate to the system in step (2), heat and stir to mix, filter, and obtain tableware drying agent.

[0022] As a further improvement of the present invention, the stirring and mixing time is 10-20 min, and the heating and stirring temperature is 50-60℃ for 10-20 min.

[0023] The present invention has the following beneficial effects:

[0024] This invention utilizes a combination of nonionic and anionic surfactants. Their synergistic effect ensures moderate overall foaming in the drying agent, prevents bitterness in rinsed tableware, and improves both drying efficiency and cleaning power. Furthermore, the nonionic and anionic surfactants used in this invention are bio-based, possessing good biodegradability. They decompose rapidly in the natural environment after use, reducing pollution and making the invention more environmentally friendly.

[0025] This invention incorporates a pH adjuster to regulate the pH of the entire system to 2-4. This acidic environment inhibits microbial growth and neutralizes alkaline residues in the dishwasher, preventing the formation of "alkaline stains." Simultaneously, the added sodium citrate chelates calcium and magnesium ions, inhibiting scale buildup; while sodium polyacrylate disperses protein and starch stains, significantly improving the removal rate of tea and coffee stains.

[0026] The defoamer of this invention is a mixture of tannic acid polyether and modified polydopamine@silica. The tannic acid polyether is prepared by ring-opening polymerization of propylene oxide (PO) and ethylene oxide (EO) using tannic acid as a raw material and a bimetallic cyanide complex (DMC) as a catalyst. This process not only produces tannic acid polyether with strong defoaming and foam-suppressing abilities but is also biodegradable, environmentally friendly, and meets environmental protection requirements. Furthermore, the preparation method is simple, efficient, and low-cost. PO end-capping increases the lipophilicity of the polymer chain, thereby enhancing the defoaming performance of the defoamer. The copolymerization of EO and PO increases the hydrophilicity of the polymer chain, thereby enhancing the foam-suppressing performance of the defoamer. The synergistic effect of these two components significantly improves the defoaming rate of the prepared tannic acid polyether. Simultaneously, tannic acid provides multiple reaction sites, resulting in a significantly improved defoaming effect of the polyether. Additionally, it exhibits good synergistic antibacterial properties.

[0027] This invention also prepares modified polydopamine@silica, using nano-silica as a carrier. The silica acts as a carrier and thickener, enabling the defoamer to function better in different media. After surface modification by polydopamine coating, dopamine is used as a bioactive raw material. Its hydroxyl groups react with monomeric alkyl isocyanates to produce modified polydopamine@silica that can quickly spread on the foam surface, reducing the local surface tension of the foam and causing it to break down. At the same time, its hydrophobic portion can insert into the foam liquid film, disrupting the stability of the liquid film and accelerating the defoaming effect of the foam.

[0028] The two defoamers in this invention work together to have a synergistic effect, accelerating the merging and breaking of foam, resulting in rapid defoaming and thus accelerating the washing and drying process.

[0029] This invention provides a tableware drying agent using bio-based raw materials as components. It has a good drying effect, good biodegradability, excellent defoaming effect, and is made with food-grade antibacterial agents, making it safer, more environmentally friendly, and baby-friendly. It also enhances stain removal, reduces limescale formation, and solves the problem of children's tableware being "bitter to the touch," thus having broad application prospects. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The average particle size of nano-silica is 100-200 nm.

[0032] Preparation Example 1: Preparation of Tannic Acid Polyether

[0033] The method is as follows:

[0034] 10g of tannic acid and a bimetallic cyanide complex DMC were mixed, with the amount of DMC added being 1wt% of the mass of tannic acid. Under ammonia protection, at a temperature of 155℃ and a pressure of 0.1MPa, a mixture of propylene oxide and ethylene oxide was introduced, with the mass ratio of propylene oxide to ethylene oxide in the mixture being 10:5. The mixture was stirred and reacted. When the pressure inside the reactor dropped back to the initial pressure, propylene oxide was introduced, and the reaction was continued at the same temperature. When the pressure inside the reactor dropped back to the initial pressure, the temperature was lowered to 125℃, and a vacuum was applied for 0.5h. Then, the mixture was cooled to room temperature to obtain tannic acid polyether.

[0035] Preparation Example 2: Preparation of Tannic Acid Polyether

[0036] The method is as follows:

[0037] 10g of tannic acid and a bimetallic cyanide complex DMC were mixed, with the amount of DMC added being 2wt% of the mass of tannic acid. Under ammonia protection, at a temperature of 165℃ and a pressure of 0.15MPa, a mixture of propylene oxide and ethylene oxide was introduced, with the mass ratio of propylene oxide to ethylene oxide in the mixture being 10:7. The mixture was stirred and reacted. When the pressure inside the reactor dropped back to the initial pressure, propylene oxide was introduced, and the reaction was continued at the same temperature. When the pressure inside the reactor dropped back to the initial pressure, the temperature was lowered to 135℃, and a vacuum was applied for 1.5h. Then, the mixture was cooled to room temperature to obtain tannic acid polyether.

[0038] Preparation Example 3: Preparation of Tannic Acid Polyether

[0039] The method is as follows:

[0040] 10g of tannic acid and a bimetallic cyanide complex DMC were mixed, with the amount of DMC added being 1.5wt% of the mass of tannic acid. Under ammonia protection, at a temperature of 160℃ and a pressure of 0.12MPa, a mixture of propylene oxide and ethylene oxide was introduced, with the mass ratio of propylene oxide to ethylene oxide in the mixture being 10:6. The mixture was stirred and reacted. When the pressure inside the reactor dropped back to the initial pressure, propylene oxide was introduced, and the reaction was continued at the same temperature. When the pressure inside the reactor dropped back to the initial pressure, the temperature was lowered to 130℃, and a vacuum was applied for 1 hour. The mixture was then cooled to room temperature to obtain tannic acid polyether.

[0041] Comparative Preparation Example 1

[0042] The difference from Preparation Example 3 is that tannic acid was replaced by an equal mass of alkyl glycoside.

[0043] Comparative Preparation Example 2

[0044] The difference from Preparation Example 3 is that tannic acid was replaced by an equal mass of cashew phenol.

[0045] Preparation Example 4: Preparation of Modified Polydopamine@Silica

[0046] The method is as follows:

[0047] S1. Preparation of polydopamine-modified silica nanospheres: 10g of nano silica was added to 200mL of Tris-HCl solution with pH 8.5, 3g of dopamine hydrochloride was added, the mixture was heated to 45℃, stirred for 3h, centrifuged, washed, and dried to obtain polydopamine-modified silica nanospheres.

[0048] S2. Preparation of modified polydopamine@silica: 10g of polydopamine-modified silica nanospheres and 2g of cyclohexyl isocyanate were added to 200mL of 1,4-dioxane or acetone, and dibutyltin dilaurate was added. The amount of dibutyltin dilaurate added was 2wt% of the mass of the polydopamine-modified silica nanospheres. The mixture was stirred at room temperature for 7h, centrifuged, washed, and dried to obtain modified polydopamine@silica.

[0049] Preparation Example 5: Preparation of Modified Polydopamine@Silica

[0050] The method is as follows:

[0051] S1. Preparation of polydopamine-modified silica nanospheres: 10g of nano silica was added to 200mL of Tris-HCl solution with pH 9.5, 5g of dopamine hydrochloride was added, the mixture was heated to 55℃, stirred for 5h, centrifuged, washed, and dried to obtain polydopamine-modified silica nanospheres.

[0052] S2. Preparation of modified polydopamine@silica: 10g of polydopamine-modified silica nanospheres and 4g of dodecyl isocyanate were added to 200mL of 1,4-dioxane or acetone, and dibutyltin dilaurate was added. The amount of dibutyltin dilaurate added was 3wt% of the mass of the polydopamine-modified silica nanospheres. The mixture was stirred at room temperature for 9h, centrifuged, washed, and dried to obtain modified polydopamine@silica.

[0053] Preparation Example 6: Preparation of Modified Polydopamine@Silica

[0054] The method is as follows:

[0055] S1. Preparation of polydopamine-modified silica nanospheres: 10g of nano silica was added to 200mL of Tris-HCl solution with pH 9, 4g of dopamine hydrochloride was added, the mixture was heated to 50℃, stirred for 4h, centrifuged, washed, and dried to obtain polydopamine-modified silica nanospheres.

[0056] S2. Preparation of modified polydopamine@silica: 10g of polydopamine-modified silica nanospheres and 3g of octadecyl isocyanate were added to 200mL of 1,4-dioxane or acetone, and dibutyltin dilaurate was added. The amount of dibutyltin dilaurate added was 2.5wt% of the mass of the polydopamine-modified silica nanospheres. The mixture was stirred at room temperature for 8h, centrifuged, washed, and dried to obtain modified polydopamine@silica.

[0057] Comparative preparation example 3

[0058] The difference from Preparation Example 6 is that the polydopamine-modified silica nanospheres were replaced with an equal mass of dopamine hydrochloride.

[0059] Test Example 1

[0060] The products obtained from Preparation Examples 1-3 and Comparative Preparation Examples 1-2 were subjected to performance tests, and the results are shown in Table 1. Methods for determining the defoaming and foam-suppressing properties of the defoamer:

[0061] Measure 30 mL of the prepared foaming solution (1 wt% sodium dodecylbenzenesulfonate aqueous solution) into a graduated cylinder, shake it up and down 30 times with the same force, and let it stand. Record the foam scale. Inject 0.1 g of defoamer with a syringe, and simultaneously start recording the foam scale at 1, 2, 3, 4, 5, 6, 7, and 8 minutes after addition. Calculate the foam layer height.

[0062] The defoaming efficiency is calculated using the following formula: η=[1-∑h t / (8h a )]×100%

[0063] In the formula: η is the defoaming efficiency, ha h represents the height of the foam layer before defoaming. t The height of the foam layer is shown at different times after defoaming. Each sample was repeated three times in parallel, and the average foam height was calculated as the evaluation standard for the defoamer's ability to break and suppress foam.

[0064] Biodegradability performance test:

[0065] The soil decomposition test was used, in which 10g of sample was buried underground and the degree of degradation (mass loss rate) of the sample was tested after 3 months.

[0066] Table 1

[0067] Group Defoaming rate (%) Degradation level (%) Preparation Example 1 98.88 99.2 Preparation Example 2 98.80 99.0 Preparation Example 3 98.95 99.5 Preparation Example 4 94.67 61.5 Preparation Example 5 95.82 62.1 Preparation Example 6 96.44 62.7 Comparative Preparation Example 1 90.42 92.5 Comparative Preparation Example 2 15.94 51.4 Comparative preparation example 3 65.29 78.5

[0068] As can be seen from the table above, the products obtained in Preparation Examples 1-6 of the present invention have good defoaming efficiency, and the products obtained in Preparation Examples 4-6 also have good degradability. In Preparation Examples 4-6, the degree of degradation is reduced because the nano-silica contained in the products is difficult to degrade.

[0069] Example 1

[0070] This embodiment provides a tableware drying agent, which, based on a total mass content of 100%, comprises 10% defoamer, 2% surfactant, 2% sodium xylenesulfonate, 0.1% natamycin, 0.6% citric acid, 0.4% sodium citrate, and 0.5% sodium polyacrylate, with the balance being water. The defoamer is a mixture of tannic acid polyether obtained in Preparation Example 1 and modified polydopamine@silica obtained in Preparation Example 4, with a mass ratio of 10:3. The surfactant is a mixture of alkyl glycoside and sodium cocoyl oxyethyl sulfonate, with a mass ratio of 5:2.

[0071] The preparation method includes the following steps:

[0072] (1) Add the surfactant and sodium xylenesulfonate to water and stir for 10 min;

[0073] (2) Add all components except sodium polyacrylate to the system in step (1) and stir for 10 min;

[0074] (3) Add sodium polyacrylate to the system in step (2), heat to 50°C, stir and mix for 10 min, filter, and obtain tableware drying agent.

[0075] Example 2

[0076] This embodiment provides a tableware drying agent, which, based on a total mass content of 100%, comprises 14% defoamer, 5% surfactant, 4% xylenesulfonate amine, 0.5% nisin, 0.1% pH adjuster, and 1% sodium polyacrylate, with the balance being water. The defoamer is a mixture of tannic acid polyether obtained in Preparation Example 2 and modified polydopamine@silica obtained in Preparation Example 5, with a mass ratio of 10:5. The surfactant is a mixture of alkyl glycoside and sodium cocoyl oxyethyl sulfonate, with a mass ratio of 10:4.

[0077] The preparation method includes the following steps:

[0078] (1) Add the surfactant and xylenesulfonate to water and stir for 20 min;

[0079] (2) Add all components except sodium polyacrylate to the system in step (1) and stir for 20 min;

[0080] (3) Add sodium polyacrylate to the system in step (2), heat to 60°C, stir and mix for 20 minutes, filter, and obtain tableware drying agent.

[0081] Example 3

[0082] This embodiment provides a tableware drying agent, which, based on a total mass content of 100%, comprises 12% defoamer, 3% surfactant, 3% sodium isopropylbenzenesulfonate, 0.3% nisin, 0.3% citric acid, 0.2% sodium citrate, and 0.7% sodium polyacrylate, with the balance being water. The defoamer is a mixture of tannic acid polyether obtained in Preparation Example 3 and modified polydopamine@silica obtained in Preparation Example 6, with a mass ratio of 10:4. The surfactant is a mixture of alkyl glycoside and sodium cocoyl oxyethyl sulfonate, with a mass ratio of 7:3.

[0083] The preparation method includes the following steps:

[0084] (1) Add surfactant and sodium isopropylbenzenesulfonate to water and stir for 15 min;

[0085] (2) Add all components except sodium polyacrylate to the system in step (1) and stir for 15 min;

[0086] (3) Add sodium polyacrylate to the system in step (2), heat to 55°C, stir and mix for 15 minutes, filter, and obtain tableware drying agent.

[0087] Example 4

[0088] The difference from Example 3 is that the surfactant is a single alkyl glycoside.

[0089] Example 5

[0090] The difference from Example 3 is that the surfactant is a single sodium cocoyl oxyethyl sulfonate.

[0091] Comparative Example 1

[0092] The difference from Example 3 is that the defoamer is a single tannic acid polyether prepared in Preparation Example 3.

[0093] Comparative Example 2

[0094] The difference from Example 3 is that the defoamer is a single modified polydopamine@silica prepared in Preparation Example 6.

[0095] Comparative Example 3

[0096] The difference from Example 3 is that the tannic acid polyether was prepared by Comparative Preparation Example 1.

[0097] Comparative Example 4

[0098] The difference from Example 3 is that the tannic acid polyether was prepared from Comparative Preparation Example 2.

[0099] Comparative Example 5

[0100] The difference from Example 3 is that the modified polydopamine@silica was prepared by Comparative Preparation Example 3.

[0101] Test Example 2

[0102] 10g each of the tableware drying agents prepared in Examples 1-5 and Comparative Examples 1-5 were used in the rinsing operation of a dishwasher. The samples to be cleaned were 10 ceramic bowls of the same size, model, and material. The dishwasher was a Hualing Vie6 dishwasher, and the detergent was Finish dishwasher detergent. The washing program was: 1 hour washing at 60℃, followed by 1 hour rinsing at 80℃. Specific operation was performed according to the equipment instructions and manual. The washing water was tap water, and the calcium and magnesium ion content was tested to be less than 300ppm. Performance testing was conducted.

[0103] Stain area test: After rinsing, observe whether there are spots or films on the sample surface. If so, calculate the percentage of the total area of ​​the container and take the average value as the stain area.

[0104] Foam production level: Observe whether foam is produced during the rinsing process, and rate the amount of foam produced. The rating criteria are shown in Table 2 below:

[0105] Table 2

[0106]

[0107]

[0108] Antibacterial test: Refer to the evaluation method for antibacterial effect in QB / T2738-2012. The antibacterial effect of the tableware drying agents prepared in Examples 1-5 and Comparative Examples 1-5 was measured at a concentration of 10... 6 The bactericidal rate (%) of Staphylococcus aureus (ATCC6538), Escherichia coli (ATCC25922), and Candida albicans (ATCC10231) after 3 hours of exposure with cfu / mL.

[0109] The results are shown in Table 3.

[0110] Table 3

[0111]

[0112] As can be seen from the table above, the tableware drying agents prepared in Examples 1-3 of this invention have good overall performance.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tableware drying agent, characterized by, The utensil drying agent comprises 10-14% of defoaming agent, 2-5% of surfactant, 2-4% of solubilizer, 0.1-0.5% of bactericide, 0.1-1% of pH regulator, 0.5-1% of sodium polyacrylate, and the balance of water, based on the total content of the utensil drying agent being 100%; the defoaming agent is a mixture of tannin polyether and modified polydopamine@silica, with a mass ratio of 10:3-5.

2. The ware drying agent according to claim 1, characterized in that, The surfactant is a mixture of non-ionic surfactant and anionic surfactant, with a mass ratio of 5-10:2-4; the non-ionic surfactant is at least one selected from alkyl glycoside, sophorose lipid, and rhamnose lipid; the anionic surfactant is at least one selected from fatty alcohol polyoxyethylene ether sulfate and sodium cocoyl oxyethyl sulfonate.

3. The ware drying agent according to claim 1, characterized in that, The preparation method of the tannin polyether is as follows: The tannin acid and the catalyst are mixed, and a mixture of propylene oxide and ethylene oxide is introduced under the protection of inert gas at high temperature and reduced pressure; when the pressure in the reaction kettle is reduced to the initial pressure again, propylene oxide is introduced, and the reaction is continued; when the pressure in the reaction kettle is reduced to the initial pressure again, the temperature is lowered, vacuum is extracted, and then the temperature is lowered to room temperature, to obtain the tannin polyether.

4. The ware drying agent according to claim 3, characterized in that, The catalyst is a double metal cyanide complex DMC, and the addition amount of the catalyst is 1-2wt% of the mass of the tannin acid; the temperature of high temperature and reduced pressure is 155-165℃, and the pressure is 0.1-0.15MPa; the mass ratio of propylene oxide to ethylene oxide in the mixture of propylene oxide and ethylene oxide is 10:5-7; the temperature of temperature lowering and vacuum extraction is 125-135℃, and the time is 0.5-1.5h.

5. The ware drying agent according to claim 1, characterized in that, The preparation method of the modified polydopamine@silica is as follows: S1. Preparation of polydopamine modified silica nanospheres: nano-silica is added to a Tris-HCl solution, hydrochloric acid dopamine is added, heated and stirred, centrifuged, washed, and dried to obtain polydopamine modified silica nanospheres; S2. Preparation of modified polydopamine@silica: polydopamine modified silica nanospheres and monomer alkyl isocyanate are added to a solvent, a catalyst is added, and the reaction is stirred at room temperature; centrifuged, washed, and dried to obtain modified polydopamine@silica.

6. The ware drying agent according to claim 5, characterized in that, In step S1, the average particle size of the nano-silica is 100-200nm, the mass ratio of the nano-silica to hydrochloric acid dopamine is 10:3-5, the pH value of the Tris-HCl solution is 8.5-9.5, and the temperature of the heated and stirred reaction is 45-55℃, and the time is 3-5h.

7. The ware drying agent according to claim 5, characterized in that, In step S2, the mass ratio of the polydopamine modified silica nanospheres to monomer alkyl isocyanate is 10:2-4, the monomer alkyl isocyanate is at least one selected from cyclohexyl isocyanate, dodecyl isocyanate, and octadecyl isocyanate, the catalyst is dibutyltin dilaurate, the addition amount of the catalyst is 2-3wt% of the mass of the polydopamine modified silica nanospheres, the time of the room temperature stirring reaction is 7-9h, and the solvent is 1,4-dioxane or acetone.

8. The ware drying agent according to claim 1, characterized by The solubilizing agent is selected from at least one of sodium cumenesulfonate, sodium xylene sulfonate, amine xylene sulfonate, the bactericide is selected from at least one of natamycin, streptococcal lactate, and the pH regulator is at least one of citric acid, lactic acid, malic acid, and sodium citrate.

9. A process for the preparation of a tableware drying agent as claimed in any one of claims 1 to 8, characterized in that The method comprises the following steps: (1) adding a surfactant and a solubilizing agent into water and stirring and mixing; (2) adding other components except sodium polyacrylate into the system in step (1) and stirring and mixing; (3) adding sodium polyacrylate into the system in step (2), stirring and mixing under heating, filtering, and obtaining a tableware drying agent.

10. The method of claim 9, wherein, The stirring and mixing time is 10-20 min, and the stirring and mixing temperature under heating is 50-60℃, and the time is 10-20 min.

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