Dish-washing machine drier as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of drier preparation, and particularly relates to a dishwasher drier and a preparation method and application thereof. The dishwasher drier provided by the invention comprises fatty alcohol-polyoxyethylene ether, a fatty alcohol polyethylene / polypropylene ether copolymer, water-based fluorine-containing polyether siloxane, a polyacrylate modified polymer, sodium isooctanol sulfate, a chelating agent, a suspension stabilizer, a preservative and water. The stainless steel foam inhibitor is applied to an automatic dish-washing machine, and by introducing a modified silicone oil or fluorocarbon compound composite system, a combination of a high-molecular-weight polymer and a low-surface-tension regulator and a biocompatible defoaming agent, the drying performance of the stainless steel surface is remarkably improved, and the foam inhibition effect is optimized; foam generated by protein and an anionic surfactant is efficiently eliminated, meanwhile, environmental protection and sustainability are emphasized, and an efficient, clean and environment-friendly solution is brought to the automatic dish washing machine industry.

Description

Technical Field

[0001] The invention belongs to the technical field of drying agent preparation, and in particular relates to a dishwasher drying agent and a preparation method and application thereof. Background Art

[0002] Dishwasher drying agent is a cleaning agent specially used in dishwashers. It is used together with dishwasher detergent. Its main function is to help accelerate the drying process of tableware after automatic dishwasher cleaning, and to reduce the residual water on the surface of tableware as much as possible so that it can be dried quickly and reduce the problem of bacterial growth, thereby improving the cleaning efficiency and effect of the dishwasher. The dishwasher detergent used in the main wash process is an alkaline detergent or a polyanionic surfactant. Alkaline washing has an excellent removal effect on organic dirt such as protein, polysaccharides, and grease on tableware, but it is easy to produce foam during the main wash process. When it flows to the rinsing process, if the household dishwasher uses a quick wash or time-saving or water-saving mode for cleaning, there is only a short rinse time such as 10 minutes. Insufficient rinsing can easily leave foam on the surface of the tableware and produce tear marks.

[0003] In the development of dishwasher drying agents, the prior art has improved foam control and rinsing performance through quick-drying solvents, composite surfactant systems and other means, but it is still insufficient in achieving rapid drying of tableware, especially stainless steel surfaces, and there are problems such as limited quick-drying effect, incomplete control of foam residue and limited material applicability, which need further research and optimization. For example: Chinese patent document CN105062715A discloses a household automatic dishwasher rinse agent with sterilization effect, which includes chelating agent, non-ionic surfactant, suspension stabilizer, hydrotropes, preservatives and sterilizers, quick-drying solvents, anti-corrosion aids, pH regulators, essences and deionized water. The quick-drying solvent disclosed in the quick-drying solvent can accelerate the drying speed of tableware moisture during the automatic dishwasher drying process, and does not generate stable foam during the rinsing process, which is convenient for rinsing. However, the effect of using quick-drying solvents to accelerate the drying of tableware is limited, and adding quick-drying solvents will bring the risk of hazardous chemicals to the product. Secondly, Chinese patent document CN110331051A discloses an automatic dishwasher detergent composition, which comprises component A and component B, wherein component A is a cationic high molecular polymer, and component B is isomeric fatty alcohol polyether olefin sulfate. The above-mentioned automatic dishwasher detergent composition has the performance of inhibiting foam generation and eliminating foam even under low temperature conditions, and is suitable for the fast washing mode of the automatic dishwasher. The composition may also contain other surfactants: fatty alcohol alkoxylates, polyether surfactants, etc., and the isomeric fatty alcohol polyether olefin sulfate is compounded with polyether surfactants to achieve a low-foam dishwasher detergent, which can achieve the effect of inhibiting and eliminating foam during the main wash process and improve the rinsing performance in the rinsing stage, but the problem of drying the tableware is not mentioned. Chinese patent document CN108795597A discloses a low-foaming automatic dishwasher special detergent composition, which mainly consists of component A, a polysiloxane defoamer, component B, a natural oil direct polyoxyethylene and polyoxypropylene compound, and the surfactant A is an anionic surfactant. The low-foaming automatic dishwasher special detergent composition solves the foam control problem of the current automatic dishwasher special detergent, and also solves the foam problem generated during the main wash process, and improves the rinsing performance in the rinsing stage, but does not mention the problem of being able to dry the tableware.

[0004] In summary, although the current dishwasher drying agent technology has made some progress in foam control and rinsing performance, it still has obvious shortcomings in improving the rapid drying effect of tableware, especially stainless steel surfaces. It also faces challenges such as limited quick-drying effect, difficult to control foam residue and limited material applicability. Further technological breakthroughs and optimization are urgently needed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a dishwasher drying agent and a preparation method and application thereof. The present invention provides a dishwasher drying agent suitable for fast washing or time-saving or water-saving mode washing through scientific compatibility, and provides an effective solution to the problems of short rinsing time, insufficient rinsing, easy to leave foam on the surface of tableware, and tear marks.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The first object of the present invention is to provide a dishwasher drying agent, comprising the following components and their mass percentages: 5.0-18.0% of fatty alcohol polyoxyethylene ether, 1.0-18.0% of fatty alcohol polyethylene / polypropylene ether copolymer, 0.06-2.0% of water-based fluorine-containing polyether siloxane, 0.05-2.8% of polyacrylate modified polymer, 0.1-4.0% of sodium isooctyl sulfate, 0.05-3.0% of chelating agent, 0.05-3.0% of suspension stabilizer, 0.03-0.1% of preservative and the remainder of water;

[0008] The mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1: (1-1.50);

[0009] The mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer to the water-based fluorinated polyether siloxane is 1: (0.01-0.5).

[0010] Preferably, the chelating agent comprises one or more of hydroxyethylidene diphosphonate, sodium citrate and tetrasodium glutamate diacetate (GLDA).

[0011] Preferably, the preservative includes one or more of methylisothiazolinone, methylchloroisothiazolinone and 2-bromo-2-nitropropane-1,3-diol complex.

[0012] Preferably, the suspension stabilizer is further included; the suspension stabilizer is selected from Dow ACUSOL 445N, ACUSOL 588 or ACUSOL 497NG.

[0013] The second object of the present invention is to provide a method for preparing the above-mentioned dishwasher drying agent, comprising the following steps:

[0014] Weigh the above-mentioned raw materials of the dishwasher drying agent and set them aside; first add part of the water into the reaction kettle for stirring at a stirring speed of 25 to 35 rpm, maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 1 to 3 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 4 to 6 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 40 to 50 rpm. After reacting for 10 to 20 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining water. After stirring for 20 to 40 minutes, the dishwasher drying agent is obtained.

[0015] Another object of the present invention is to provide a dishwasher cleaning system, comprising the above-mentioned dishwasher drying agent and a conveying device for conveying the drying agent to the interior of the dishwasher.

[0016] Another object of the present invention is to provide a method for using the above-mentioned dishwasher drying agent, which includes adding the drying agent into the dishwasher and contacting it with water and tableware during the operation of the dishwasher to accelerate the evaporation of water on the surface of the tableware and improve the drying efficiency of the tableware.

[0017] Preferably, the method further comprises adding the drying agent after the main wash stage and before the rinse stage or during the rinse stage of the dishwasher to further optimize the drying effect and washing performance.

[0018] Preferably, the tableware comprises tableware made of stainless steel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a dishwasher drying agent and a preparation method and application thereof. Through scientific matching, an effective solution is provided to address the shortcomings of existing dishwasher drying agents in improving the rapid drying effect of tableware (especially stainless steel surfaces), which can significantly improve the drying speed and effect of tableware. At the same time, the generation and residue of foam are effectively controlled, tear marks and spots are reduced, and the cleaning effect is improved.

[0021] Secondly, the drying agent provided by the present invention can effectively improve the problem of residual stains or drying agent on the surface of tableware due to short rinsing time and insufficient rinsing in the quick wash or time-saving and water-saving modes of the dishwasher, further improve the rinsing performance, and ensure the cleanliness of the tableware surface.

[0022] The drying agent provided by the present invention is also applicable to a wide range of materials. By optimizing the formula and compatibility, the rapid drying effect of tableware made of materials such as stainless steel is effectively improved, making the drying agent applicable to more types of tableware materials, thereby expanding the applicability of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a defoaming performance effect diagram of the dishwasher drying agent in Example 1 of the present invention;

[0024] Figure 2 This is a defoaming performance effect diagram of the dishwasher drying agent according to Example 2 of the present invention;

[0025] Figure 3 This is a defoaming performance effect diagram of the dishwasher drying agent of Example 3 of the present invention;

[0026] Figure 4 This is a defoaming performance effect diagram of the dishwasher drying agent of Example 4 of the present invention;

[0027] Figure 5 This is a defoaming performance effect diagram of the dishwasher drying agent of Example 5 of the present invention;

[0028] Figure 6 This is a diagram showing the defoaming performance of the dishwasher drying agent in comparative example 1;

[0029] Figure 7 This is a diagram showing the defoaming performance of the dishwasher drying agent in comparative example 2;

[0030] Figure 8 This is a defoaming performance effect diagram of the dishwasher drying agent of comparative example 3;

[0031] Fig. 9 This is a diagram showing the defoaming performance of the dishwasher drying agent of Comparative Example 4;

[0032] Fig.10 This is a defoaming performance effect diagram of the dishwasher drying agent of comparative example 5;

[0033] Fig.11 This is a diagram showing the defoaming performance of the dishwasher drying agent in comparative example 6.

[0034] annotation: Figures 1 to 11 This is a picture of a dishwasher cylinder, which is a connected whole with a plate in the middle to help support and block the water outlet cylinder, making it appear to be divided into two cylinders on the left and right. If the experimental results show that the foam on the left and right sides of the cylinder is inconsistent, it can still be explained that there is foam in half a cylinder. DETAILED DESCRIPTION

[0035] The above contents of the present invention are further described in detail below by means of specific implementation methods in the form of examples, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples.

[0036] 1. Source of raw material components

[0037] Table 1 Source information of raw material components

[0038]

[0039] 2. The inventive concept or principle of the present invention:

[0040] In the main wash process of traditional dishwashers, alkaline detergents or polyanionic surfactants are mostly used as detergents. These detergents can effectively remove organic dirt such as protein, polysaccharides, and grease on tableware, but they are prone to foam. When these foams flow into the rinsing stage, especially when the household dishwasher uses the quick wash, time-saving or water-saving mode, due to the short rinsing time (for example, only 10 minutes), it may lead to insufficient rinsing, residual foam on the surface of the tableware, forming tear marks and spots, and even affecting the drying effect, resulting in the plates not drying or spots. Excessive foam may also cause the dishwasher to overflow, eventually causing shutdown.

[0041] The drying speed of tableware is not only affected by the thickness of the water film, but also closely related to the surface temperature of the tableware material. Generally, the higher the surface temperature of the tableware, the faster it dries. However, due to its high thermal conductivity, stainless steel tableware dissipates heat quickly and the surface temperature drops sharply, which exacerbates the drying problem of stainless steel tableware.

[0042] To solve these problems, dishwasher drying agents came into being. Dishwashing agents are used in conjunction with detergents to use surfactants to be adsorbed onto dishes during the cleaning process, reducing the contact angle between the rinse water and the surface of the dishes, and using the characteristics of low surface tension to reduce the thickness of the rinse water film, thereby achieving rapid drying of dishes at room temperature.

[0043] In the prior art, mainstream automatic dishwasher drying agents use fatty alcohol polyoxyethylene ether and fatty alcohol polyethylene / polypropylene copolymers with foam suppression effect to achieve a reasonable lubrication-suppression ratio and reduce foam performance. However, the formula system using only these two still cannot completely eliminate the foam problem carried over to the rinse after the main wash, causing problems during the operation of the dishwasher.

[0044] To solve this problem, the present invention introduces an aqueous fluorinated polyether siloxane compounding system into fatty alcohol polyoxyethylene ether and fatty alcohol polyethylene / polypropylene copolymer. This system can not only reduce the surface tension of the formula system, realize the rapid drying of the stainless steel surface, but also effectively eliminate the foam problem caused in the main washing process. The working principle of the rapid drying of the present invention is that the compounding system has a lower surface tension than anionic surfactants or single fatty alcohol polyethers. By introducing aqueous fluorinated polyether siloxane, the surface tension of water is reduced from 72.4mN / m to less than 25mN / m, so that water is spread into a thin water film on the stainless steel surface, and rapid drying is achieved. The working principle of the defoaming of the present invention is that the aqueous fluorinated polyether siloxane has an extremely low surface tension, which can be quickly spread on the foam surface to form a thin water film layer, replace the original foam thin wall, and then diffuse and spread to the liquid film with high surface tension of the foam, so that the film wall becomes thinner, and finally causes the foam to break.

[0045] 4. The role of each substance in the dishwasher drying agent formula of the present invention

[0046] (1) Fatty alcohol polyoxyethylene ether:

[0047] The general formula of fatty alcohol polyoxyethylene ether is as follows: RO-(CH 2 CH 2 O)nH. R is generally a saturated or unsaturated C12-18 hydrocarbon group, a branched or semi-branched or isomeric hydrocarbon group, and n is the addition number of ethylene oxide, that is, the number of oxyethylene groups in the surfactant molecule. The larger n is, the more oxygen on the hydrophilic group of the molecule, the more hydrogen bonds can be formed with water, and the better the water solubility. The addition number of ethylene oxide in the present invention, that is, n, is between 8 and 12. Fatty alcohol polyoxyethylene ether has wetting and spreading ability and a lower contact angle, effectively reduces surface tension, can spread quickly on the surface of tableware, and thus obtains a rapid drying effect under natural air drying conditions.

[0048] (2) Fatty alcohol polyethylene / polypropylene ether copolymer:

[0049] The general formula of fatty alcohol polyethylene / polypropylene ether copolymer is as follows: RO-(CH 2 CH 2 O) n -(CH 2 CHCH 3 O) m -H, R is a monoalkyl fatty alcohol with a carbon chain structure of C8-18, n is the addition number of EO, n is 2-10 and is a positive integer, m is the addition number of PO, m is 2-8 and is a positive integer, and the ratio of n:m is 0.2-4.

[0050] Fatty alcohol polyethylene / polypropylene ether copolymer is a partially concentrated block polyether product obtained by ring-opening addition of polyoxyethylene and polyoxypropylene ether to fatty alcohol under the action of an alkaline catalyst. Fatty alcohols include linear alcohols or branched isomeric alcohols. Alkoxy groups include ethoxy groups and propoxy groups. By adjusting the degree of polymerization (N) of polyether ethylene oxide (EO) and propylene oxide (PO) and the ratio of the two, the foam suppression performance and surface wetting angle of the product can be changed. When the polyether ethylene oxide (EO) increases, the water solubility of the product increases and the cloud point rises. When the PO component in the polyether increases, the foam suppression performance of the product increases. The present invention adopts fatty alcohol polyethylene / polypropylene ether copolymer to compound fatty alcohol polyoxyethylene ether, which can effectively suppress the foam caused by fatty alcohol polyoxyethylene ether on the wettable surface, so that the drying agent product can achieve the effect of low foam or no foam in the rinsing process with a small amount of addition, avoiding the generation of rinsing foam residue.

[0051] (3) Water-based fluorinated polyether siloxane:

[0052] Generally, silicone-modified polyethers are modified silicone oils with different properties made by replacing the methyl group in dimethyl silicone oil molecules with special functional groups. Water-based fluorinated polyether siloxanes are silicone oils modified by fluorinated hydrocarbon groups and polyethers in fluorinated chain segments. They are branched-chain modified dimethyl silicone oils. The viscosity decreases with the increase of shear force, and the dispersibility is correspondingly enhanced. Therefore, they can exhibit excellent defoaming performance in high-temperature, alkaline, and high-shear foaming systems. Their defoaming and anti-foaming properties are better than those of linear modified ether siloxanes.

[0053] The present invention adds water-based fluorinated polyether siloxane to the drying agent formula, which belongs to a nonionic surfactant. It is firstly prepared by an addition ring-opening reaction of dimethyl siloxane, trifluoropropyl methyl siloxane and tetramethyl disiloxane to obtain a fluorosilicone oil with hydrogen at the end group, and then alkenyl polyoxyethylene polyoxypropylene ether is added, and a hydrosilylation reaction is performed to finally generate water-based fluorinated polyether siloxane. The prepared water-based fluorinated polyether siloxane belongs to a nonionic surfactant, and its surface tension is 10mN / m lower than that of siloxane. The organic fluorine-modified siloxane is compounded in its preparation formula, which can effectively reduce the surface tension of fatty alcohol polyoxyethylene ether, and the surface tension is reduced from 40-45mN / m to 20mN / m, so that the wetting angle is small enough to obtain good spreading and wetting, thereby accelerating the ability of water to spread quickly on the stainless steel surface and accelerating the air drying time. Secondly, the present invention adopts water-based fluorinated polyether siloxane compounded with fatty alcohol polyethylene / polypropylene ether copolymer, which can achieve defoaming effect in the foaming system aroused by the high-speed rotation of the spray arm of the automatic dishwasher.

[0054] (4) Polyacrylate modified polymers:

[0055] Polyacrylate modified polymers are modified polyacrylates, which can effectively suspend solid particles and hydrophobic oils flowing in during the main wash process, and have the function of inhibiting the formation of silicates, effectively reducing spots and silicon spots on the surface of tableware, especially tableware on stainless steel surfaces, and improving the surface brightness.

[0056] (5) Sodium isooctyl sulfate:

[0057] Sodium isooctyl sulfate, at low concentrations, can keep the system in a low-foam or no-foam state, increase the cloud point of the product, and maintain the stability of the system even at high temperatures.

[0058] (6) Chelating agents:

[0059] The chelating agent of the present invention is one or more of hydroxyethylidene diphosphonate, sodium citrate, and aminocarboxylic acid chelating agent. It plays a role in chelating metal ions such as calcium and magnesium in water during washing, reduces the deposition of calcium and magnesium scale on the surface of the dinner plate, and improves the washing performance.

[0060] (7) Suspension stabilizer: The suspension stabilizer of the present invention is one or more of ACUSOL 445N, ACUSOL 588, and ACUSOL 497NG. It has the functions of preventing solid particles in the liquid from sinking rapidly, keeping the particles evenly distributed in the liquid, maintaining the suspended state, increasing the dispersion of the particles in the liquid, and preventing precipitation and stratification.

[0061] (8) Preservative: The preservative of the present invention is preservative CJ-2HN, which can maintain the chemical stability of the drying agent and ensure that it maintains its original performance during storage and use.

[0062] (9) Water: as a solvent.

[0063] Example 1 Preparation of the dishwasher drying agent of the present invention

[0064] The dishwasher drying agent of the present invention comprises the following components and their mass percentages:

[0065] Fatty alcohol polyoxyethylene ether 8.0%, fatty alcohol polyethylene / polypropylene ether copolymer 8.8%, water-based fluorinated polyether siloxane 0.5%, polyacrylate modified polymer 0.1%, sodium isooctyl sulfate 2.3%, chelating agent 0.7%, suspension stabilizer 0.1%, preservative 0.06% and water as the balance;

[0066] Among them, the mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1:1.1; the mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer and the water-based fluorinated polyether siloxane is 16.8:0.5.

[0067] The preparation method of the dishwasher drying agent of the present invention comprises the following steps:

[0068] Weigh the above-mentioned raw materials of the dishwasher drying agent and set them aside; first add part of the process water into the reactor, start stirring, the stirring speed is 30 rpm (the reactor is 6 tons, and the stirring blade is 2 meters long), maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 2 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 5 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 45 rpm. After reacting for 15 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining process water. After stirring for 30 minutes, the dishwasher drying agent is obtained.

[0069] Example 2 Preparation of the dishwasher drying agent of the present invention

[0070] The dishwasher drying agent of the present invention comprises the following components and their mass percentages:

[0071] Fatty alcohol polyoxyethylene ether 8.0%, fatty alcohol polyethylene / polypropylene ether copolymer 12.0%, water-based fluorinated polyether siloxane 2.0%, polyacrylate modified polymer 0.1%, sodium isooctyl sulfate 1.0%, chelating agent 0.7%, suspension stabilizer 0.1%, preservative 0.06% and water as the balance;

[0072] Among them, the mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1:1.25; the mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer and the water-based fluorinated polyether siloxane is 1:0.1.

[0073] The preparation method of the dishwasher drying agent of the present invention comprises the following steps:

[0074] Weigh the above-mentioned raw materials of the dishwasher drying agent and set them aside; first add part of the process water into the reactor, start stirring, the stirring speed is 30 rpm (the reactor is 6 tons, and the stirring blade is 2 meters long), maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 2 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 5 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 45 rpm. After reacting for 15 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining process water. After stirring for 30 minutes, the dishwasher drying agent is obtained.

[0075] Example 3 Preparation of the dishwasher drying agent of the present invention

[0076] The dishwasher drying agent of the present invention comprises the following components and their mass percentages:

[0077] Fatty alcohol polyoxyethylene ether 8.0%, fatty alcohol polyethylene / polypropylene ether copolymer 10.0%, water-based fluorinated polyether siloxane 0.8%, polyacrylate modified polymer 0.05%, sodium isooctyl sulfate 0.5%, chelating agent 0.7%, suspension stabilizer 1.0%, preservative 0.05% and water as the balance;

[0078] Among them, the mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1:1.25; the mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer and the water-based fluorinated polyether siloxane is 18:0.8.

[0079] The preparation method of the dishwasher drying agent of the present invention comprises the following steps:

[0080] Weigh the above-mentioned raw materials of the dishwasher drying agent and set them aside; first add part of the process water into the reactor, start stirring, the stirring speed is 25 rpm (the reactor is 6 tons, and the stirring blade is 2 meters long), maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 2 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 6 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 43 rpm. After reacting for 18 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining process water. After stirring for 35 minutes, the dishwasher drying agent is obtained.

[0081] Example 4 Preparation of the dishwasher drying agent of the present invention

[0082] The dishwasher drying agent of the present invention comprises the following components and their mass percentages:

[0083] Fatty alcohol polyoxyethylene ether 5.0%, fatty alcohol polyethylene / polypropylene ether copolymer 5.0%, water-based fluorinated polyether siloxane 1.0%, polyacrylate modified polymer 2.8%, sodium isooctyl sulfate 4.0%, chelating agent 0.1%, suspension stabilizer 0.1%, preservative 0.08% and water as the balance;

[0084] Among them, the mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1:1; the mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer and the water-based fluorinated polyether siloxane is 1:0.01.

[0085] The preparation method of the dishwasher drying agent of the present invention comprises the following steps:

[0086] Weigh the above-mentioned formula raw materials of the dishwasher drying agent and set them aside; first add part of the process water into the reactor, start stirring, the stirring speed is 35 rpm (the reactor is 6 tons, and the stirring blade is 2 meters long), maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 2 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 5 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 40 rpm. After reacting for 12 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining process water. After stirring for 25 minutes, the dishwasher drying agent is obtained.

[0087] Example 5 Preparation of the dishwasher drying agent of the present invention

[0088] The dishwasher drying agent of the present invention comprises the following components and their mass percentages:

[0089] Fatty alcohol polyoxyethylene ether 12.0%, fatty alcohol polyethylene / polypropylene ether copolymer 18.0%, water-based fluorinated polyether siloxane 1.5%, polyacrylate modified polymer 0.1%, sodium isooctyl sulfate 3.5%, chelating agent 3.0%, suspension stabilizer 3.0%, preservative 0.1% and water as the balance;

[0090] Among them, the mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1:1.5; the mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer and the water-based fluorinated polyether siloxane is 1:0.05.

[0091] The preparation method of the dishwasher drying agent of the present invention comprises the following steps:

[0092] Weigh the above-mentioned formula raw materials of the dishwasher drying agent and set them aside; first add part of the process water into the reactor, start stirring, the stirring speed is 30 rpm (the reactor is 6 tons, and the stirring blade is 2 meters long), maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 3 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 4 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 45 rpm. After reacting for 15 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining process water. After stirring for 30 minutes, the dishwasher drying agent is obtained.

[0093] Comparative Example 1

[0094] Compared with Example 1, the difference of this comparative example is that no water-based fluorinated polyether siloxane is added during the preparation of the dishwasher drying agent, and the rest is the same as Example 1.

[0095] The preparation was carried out using the preparation method described in Example 1.

[0096] Comparative Example 2

[0097] Compared with Example 1, the difference of this comparative example is that the addition amount of the fatty alcohol polyoxyethylene ether is 8.0%, the addition amount of the fatty alcohol polyethylene / polypropylene ether copolymer is 4.0%, and the others are the same as Example 1.

[0098] The preparation was carried out using the preparation method described in Example 1.

[0099] Comparative Example 3

[0100] Compared with Example 1, the difference of this comparative example is that the addition amount of the fatty alcohol polyoxyethylene ether is 8.0%, the addition amount of the fatty alcohol polyethylene / polypropylene ether copolymer is 24.0%, and the others are the same as Example 1.

[0101] The preparation was carried out using the preparation method described in Example 1.

[0102] Comparative Example 4

[0103] Compared with Example 1, the difference of this comparative example is that the addition amount of the fatty alcohol polyoxyethylene ether is 8.0%, the addition amount of the fatty alcohol polyethylene / polypropylene ether copolymer is 8.8%, the addition amount of the water-based fluorinated polyether siloxane is 0.084%, and the others are the same as Example 1.

[0104] The preparation was carried out using the preparation method described in Example 1.

[0105] Comparative Example 5

[0106] Compared with Example 1, the difference of this comparative example is that the addition amount of the fatty alcohol polyoxyethylene ether is 8.0%, the addition amount of the fatty alcohol polyethylene / polypropylene ether copolymer is 8.8%, the addition amount of the water-based fluorinated polyether siloxane is 16.8%, and the others are the same as Example 1.

[0107] The preparation was carried out using the preparation method described in Example 1.

[0108] Comparative Example 6

[0109] The commercially available dishwasher drying agent was purchased from Guangzhou Kaiwei Daily Chemical Co., Ltd., and the model number was Chaobaole. Its active ingredient, 18%, was similar to that in Example 1.

[0110] Experiment 1 Performance Test

[0111] The performance test was carried out using the dishwasher drying agents of Examples 1 to 5 and Comparative Examples 1 to 6 of the present invention. The specific test method is as follows:

[0112] (1) Dynamic surface tension test

[0113] The dynamic surface tension meter (KRUSS, model BP100) was used to measure the surface tension according to the maximum bubble pressure method. The specific method is as follows:

[0114] With reference to GB / T 27842-2011 "Determination of dynamic surface tension of chemicals - Rapid bubble method", the dishwasher drying agents of Examples 1 to 5 and Comparative Examples 1 to 6 of the present invention were prepared into sample solutions with a concentration of 1 g / L, and the surface tension of the solutions with a surface age of 1000 ms was tested.

[0115] (2) Drying time of stainless steel tableware

[0116] Use a lid-type automatic dishwasher (Hobart, model AM900), add 0.1% drying agent solution, put in a 304 stainless steel plate, wash for 90 seconds in one cycle, take out and place at room temperature, and use a stopwatch to calculate the time it takes for the stainless steel plate to be completely dry, i.e., the drying time.

[0117] (3) Antifoaming performance test

[0118] At room temperature, take 10 ml of 0.1% drying agent solution in a stoppered measuring cylinder, shake it up and down 10 times, leave it on the table, and use a stopwatch to record the complete defoaming time.

[0119] The above performance test results are shown in Table 2 below.

[0120] Table 2 Performance test results

[0121] Category / Project Surface tension (mN / m) Drying time(s) Complete defoaming time(s) Example 1 21.8 66 10 Example 2 22.5 69 12 Example 3 21.9 63 10 Example 4 24.3 78 11 Example 5 22.3 59 11 Comparative Example 1 35.6 249 10 Comparative Example 2 42.2 185 10 Comparative Example 3 36.7 123 9 Comparative Example 4 35.1 204 241 Comparative Example 5 35.0 182 12 Comparative Example 6 31.5 88 128

[0122] As shown in Table 2 above, it can be seen from the results in Table 2 that the surface tension, stainless steel tableware drying time and foam suppression performance of the dishwasher drying agents prepared in Examples 1 to 5 of the present invention are significantly better than those of Comparative Examples 1 to 6. Compared with Example 1, the effect of Comparative Example 1 without adding water-based fluorinated polyether siloxane is far worse than that of the present invention, which shows that the combination of fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer and water-based fluorinated polyether siloxane has a synergistic effect. Secondly, compared with Example 1, Comparative Examples 2 to 5 further adjust the content ratio of the dishwasher drying agent fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer and aqueous fluorinated polyether siloxane. The experimental results show that the adjustment of the dosage of fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer and aqueous fluorinated polyether siloxane needs to be in accordance with the ratio set by the present invention to achieve better results, further indicating that the formula of fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer and aqueous fluorinated polyether siloxane directly affects the effect of the dishwasher drying agent of the present invention.

[0123] It can be seen from Examples 1-5 that the compound system has a lower surface tension. By introducing a low surface tension aqueous fluorinated polyether siloxane, the surface tension of water can be effectively reduced to below 25 mN / m, and a thin water film can be quickly spread on the stainless steel surface to achieve rapid drying. Fatty alcohol polyoxyethylene ether has a wetting, spreading and drying performance. If only fatty alcohol polyoxyethylene ether and fatty alcohol polyethylene / polypropylene ether copolymer are compounded, the surface tension can only be reduced to about 35 mN / m, and the drying time will be prolonged. It is difficult to achieve a drying effect on a stainless steel surface with a low thermal conductivity, that is, a surface that cools down quickly.

[0124] Comparative Example 6 is a commercially available dishwasher drying agent, and its effect is far inferior to that of the embodiment of the present invention. It can be seen that the present invention uses a compound of fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer, and water-based fluorinated polyether siloxane to achieve a synergistic effect, giving full play to the drying effect on the stainless steel surface, the foaming inhibition of detergents, and the defoaming effect on proteins and anionic surfactants.

[0125] (4) Defoaming performance on proteins and anionic surfactants (foaming system)

[0126] 0.05% of a food mixture (wheat flour: milk powder: egg = 1:1:0.5) and 0.01% of a commercially available dishwashing liquid (active matter 15%) were mixed and added to a lid-type automatic dishwasher (Hobart, model AM900), and 0.1% of the dishwasher drying agent of Examples 1 to 5 of the present invention or Comparative Examples 1 to 6 was added. The machine was turned on for 5 cycles of washing to observe the foam control effect.

[0127] The experimental results are as follows Figures 1 to 11 As shown by Figures 1 to 5 It can be seen that the present invention is applied to an automatic dishwasher to simulate the detergent and food (wheat flour, milk powder, eggs that easily generate foam in the dishwasher) that may be brought in during the main wash process. The dishwasher drying agent prepared by Examples 1 to 5 of the present invention can be seen to have a significant foam suppression effect, indicating that the dishwasher drying agent of the present invention has a significant effect in eliminating the foam generated by protein and anionic surfactants. Compared with Example 1 of the present invention, the dishwasher drying agent prepared by Example 1 to 5 of the present invention has a significant foam suppression effect. Figures 6 to 11 It can be seen that if only fatty alcohol polyoxyethylene ether and fatty alcohol polyethylene / polypropylene ether copolymer are compounded, the influence of external detergent and protein foam in the main wash process cannot be suppressed. However, if the compounding ratio of fatty alcohol polyoxyethylene ether, fatty alcohol polyethylene / polypropylene ether copolymer and water-based fluorinated polyether siloxane is adjusted, the fatty alcohol polyoxyethylene ether wetting component in the drying agent cannot suppress the generation of foam itself, so that there is too much foam in the washing tank in the later stage, affecting the washing effect.

[0128] In summary, by introducing modified silicone oil or fluorocarbon compound composite systems, high molecular weight polymers and low surface tension regulators, and biocompatible defoaming agents, the drying performance of the stainless steel surface is significantly improved, the anti-foaming effect is optimized, and the foam generated by proteins and anionic surfactants is effectively eliminated. At the same time, attention is paid to environmental protection and sustainability, bringing efficient, clean and environmentally friendly solutions to the automatic dishwasher industry.

[0129] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A dishwasher drying agent, characterized in that: The invention comprises the following components and their mass percentages: 5.0-18.0% of fatty alcohol polyoxyethylene ether, 1.0-18.0% of fatty alcohol polyethylene / polypropylene ether copolymer, 0.06-2.0% of water-based fluorinated polyether siloxane, 0.05-2.8% of polyacrylate modified polymer, 0.1-4.0% of sodium isooctyl sulfate, 0.05-3.0% of chelating agent, 0.05-3.0% of suspension stabilizer, 0.03-0.1% of preservative and the balance of water; The mass percentage of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer is 1: (1-1.50); The mass percentage of the total weight of the fatty alcohol polyoxyethylene ether and the fatty alcohol polyethylene / polypropylene ether copolymer to the water-based fluorinated polyether siloxane is 1: (0.01-0.5).

2. The dishwasher drying agent according to claim 1, characterized in that: The chelating agent includes one or more of hydroxyethylidene diphosphonate, sodium citrate and tetrasodium glutamate diacetate (GLDA).

3. The dishwasher drying agent according to claim 1, characterized in that: The preservative includes one or more of methylisothiazolinone, methylchloroisothiazolinone and 2-bromo-2-nitropropane-1,3-diol complex.

4. The dishwasher drying agent according to claim 1, characterized in that: The invention also includes a suspension stabilizer; the suspension stabilizer is selected from Dow ACUSOL 445N, ACUSOL 588 or ACUSOL 497NG.

5. A method for preparing the dishwasher drying agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: Weigh the raw materials of the dishwasher drying agent according to any one of claims 1 to 4 and set them aside; first add part of the water into the reaction kettle for stirring at a stirring speed of 25 to 35 rpm, maintain the stirring speed, add the fatty alcohol polyoxyethylene ether, stir for 1 to 3 minutes, add the fatty alcohol polyethylene / polypropylene ether copolymer, after mixing and stirring for 4 to 6 minutes, slowly add the water-based fluorinated polyether siloxane, and increase the stirring speed to 40 to 50 rpm. After reacting for 10 to 20 minutes, add the polyacrylate modified polymer, sodium isooctyl sulfate, chelating agent, suspension stabilizer, and preservative in order, and finally make up the remaining water. After stirring for 20 to 40 minutes, the dishwasher drying agent is obtained.

6. A dishwasher cleaning system, characterized in that: The invention comprises the dishwasher drying agent as claimed in any one of claims 1 to 4, and a conveying device for conveying the drying agent into the dishwasher.

7. A method for using the dishwasher drying agent as described in any one of claims 1 to 4, the method comprising adding the drying agent into the dishwasher and contacting the drying agent with water and tableware during the operation of the dishwasher to accelerate the evaporation of water on the surface of the tableware and improve the drying efficiency of the tableware.

8. The method according to claim 7, characterized in that The method also includes the step of adding the drying agent after the main wash stage and before the rinse stage or during the rinse stage of the dishwasher to further optimize the drying effect and washing performance.

9. The method according to claim 7, characterized in that: The tableware includes tableware made of stainless steel.

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