Clear-water laundry sheet and preparation method therefor

Abstract

The present invention relates to the technical field of detergent products, and discloses a clear-water laundry sheet and a preparation method therefor. The laundry sheet is prepared from the following raw materials: a surfactant, water and an auxiliary agent. The laundry sheet contains bubbles, and Plateau borders are formed between the bubbles; and the volume proportion of the bubbles is 50-90%. By adjusting the volume proportion of bubbles in the clear-water laundry sheet, the bubbles can increase the specific surface area of the sheet, thereby increasing a contact area between same and water. Moreover, Plateau borders can be formed between the bubbles to function as capillary tubes; when the laundry sheet is placed into water, water can enter the interior of the sheet along the Plateau borders, thereby accelerating the dissolution of the sheet; therefore, the laundry sheet has a rapid-dissolving effect even under low-temperature conditions, which allows the sheet to exert a cleaning effect more quickly.

Description

A laundry tablet and a preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of washing products, in particular to a laundry tablet and a preparation method thereof. BACKGROUND

[0002] Laundry tablets are deeply loved by consumers because of their convenience in carrying and transporting. When using, the laundry tablet is put into the washing machine together with clothes, and then clean water is injected to dissolve the laundry tablet, so that the clothes can be cleaned. In order to make the laundry tablet dissolve quickly, the components of the laundry tablet are required to be water-soluble materials. However, during the tablet preparation, the laundry tablet is usually pressed into a tablet by rolling, so that the surface area of the compacted laundry tablet in contact with water is small, which makes the dissolution rate slow. Especially in low temperature conditions, the dissolution rate will be greatly reduced, and even the laundry tablet has not been dissolved when the first cleaning is finished, which leads to the decrease of the decontamination ability.

[0003] It can be seen that the prior art still needs to be improved and enhanced. SUMMARY

[0004] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a laundry tablet and a preparation method thereof, which aims to solve the problem of insufficient decontamination effect caused by slow dissolution rate of the existing laundry tablet under low temperature conditions.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A laundry tablet, wherein the raw materials for preparing the laundry tablet include a surfactant, water and an additive; the laundry tablet contains bubbles, and the bubbles form Plato channels between each other; the volume ratio of the bubbles is 50-90%.

[0007] In the laundry tablet, the volume ratio of the bubbles is 70-85%.

[0008] In the laundry tablet, the diameter of the bubbles is 10-1500 microns.

[0009] In the laundry tablet, the radius of curvature of the Plato channel is 10-1500 microns.

[0010] In the laundry tablet, the raw materials for preparing the laundry tablet include, by mass percentage, 29-70% of a surfactant, 29-70% of water and 1-40% of an additive.

[0011] In the laundry tablet, the surfactant includes an anionic surfactant, a cationic surfactant and a non-ionic surfactant.

[0012] The surfactant comprises 49-99% of anionic surfactant, 0.01-5% of cationic surfactant and 0.01-50% of non-ionic surfactant by mass percentage.

[0013] The raw materials for preparing the laundry tablet comprise 60% of surfactant, 37% of water and 3% of auxiliary agent by mass percentage; the surfactant comprises 80% of anionic surfactant, 1% of cationic surfactant and 19% of non-ionic surfactant by mass percentage.

[0014] A preparation method of laundry tablet, which is used for preparing the laundry tablet as described above, comprises the following steps: stirring and mixing auxiliary agent and water, and heating to complete dissolution; adding surfactant, and stirring to complete dissolution; foaming, measuring the viscosity of the system, and after the viscosity meets the requirements, drying, tabletting, and obtaining the laundry tablet.

[0015] In the viscosity measuring step of the preparation method of laundry tablet, the system viscosity meeting the requirements is 2000-30000 mPa.s at 40-85 DEG C. Beneficial effects:

[0016] The present application provides a laundry tablet and a preparation method thereof, the laundry tablet can increase the specific surface area of the tablet by adjusting the volume ratio of bubbles, increase the contact area with water, and form Plato channels between the bubbles, the Plato channels have the function of capillary tubes, when the laundry tablet is placed in water, water can enter the interior of the tablet along the Plato channels, thus accelerating the dissolution of the tablet, and realizing the function of rapid dissolution at low temperature, so that the laundry tablet can better play the effect of stain removal.

[0017] The preparation method of the laundry tablet can increase the volume ratio of bubbles while making the formed bubbles have good strength by adjusting the composition and ratio of surfactants, thereby avoiding the rupture or combination of bubbles, and further facilitating the formation of more Plato channels and improving the dissolution rate of the tablet. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is an enlarged view of the laundry tablet under a microscope according to the laundry tablet of Example 1 of the present application.

[0019] Fig. 2 is a real object view of the laundry tablet according to Example 1. DETAILED DESCRIPTION

[0020] The present application provides a kind of clear water washing laundry piece and preparation method thereof, to make the purpose, technical scheme and effect of the present application more clear, explicit, the following examples are further detailed to the present application.It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The present application provides a kind of clear water washing laundry piece, the raw material for preparing the laundry piece includes: surfactant, water and auxiliary agent, wherein, the surfactant is used to remove stains in clothes, has stain removal effect;The water is used as solvent, can make surfactant, auxiliary agent fully mixed, form viscous mixture when preparing, to facilitate the formation of micro-bubbles;The auxiliary agent includes one or more combinations of perfume raw materials, foaming agent (such as sodium carbonate or sodium bicarbonate, etc.), enzyme preparation, bacteriostatic agent, thickening agent, filler, but not limited to these ingredients, it can also be other additives with special functional effect, by adding auxiliary agent, the laundry piece can have corresponding function, such as, by adding essence or other perfume raw materials, so that the laundry piece has the effect of increasing fragrance;By adding certain enzyme preparation, so that the laundry piece has the function of enzymolysis, further increases the stain removal effect;By adding bacteriostatic agent to make the laundry piece have the effect of bacteriostasis, etc., by adding auxiliary agent, the laundry piece can have specific function, in the specific implementation process, corresponding auxiliary agent can be selected according to actual needs.Because the components for preparing the laundry piece can be completely dissolved in water, therefore, when using, the laundry piece can be completely dissolved in water, and after dissolving in water, the water body presents clear water, no turbidity, therefore, the situation that residual powder adheres to the surface of clothes to form spots can be avoided, which shows the characteristics of clear water laundry piece.

[0022] In the present application, in order to solve the problem that the laundry piece is difficult to contain under low temperature conditions, the laundry piece also contains bubbles, the bubbles can increase the specific surface area of the sheet, increase the contact area of the sheet and water, and between the bubbles, such as three bubbles, a platonic channel can be formed, the platonic channel has capillary action, when the laundry piece is placed in water, water can penetrate into the sheet along the platonic channel, which can promote the rapid disintegration of the sheet, so that the disintegration time of the laundry piece in water under low temperature conditions is less than 45 seconds, so that the effective ingredients in the laundry piece can play a role quickly, and have better stain removal effect.

[0023] Since the Plato channel is formed between the bubbles, when the bubble volume ratio is high, more Plato channels are formed and are easy to be connected with each other, thus accelerating the dissolution of the laundry tablet, especially when the bubble diameter is small, more Plato channels are formed and are connected with each other, which greatly accelerates the dissolution of the laundry tablet. Therefore, in order to better form the Plato channel, the volume ratio of the bubble needs to be increased, and the volume ratio of the bubble is greater than 50%, such as 50-60%, 50-70%, 70-80%, 80-90%, so that the laundry tablet has more Plato channels.

[0024] However, when the volume ratio of the bubble is large, the effective component of the laundry tablet per unit volume is reduced, and meanwhile, when the volume ratio of the bubble is too large, the bubble is easy to be broken or to be gathered to form a large bubble, which is not conducive to the formation of the Plato channel. In addition, the diameter of the bubble also affects the formation of the Plato channel or the radius of the Plato channel. Through research, it is found that when the volume ratio of the bubble is fixed, the greater the diameter of the bubble, the greater the radius of the curvature of the formed Plato channel, which is easy to cause the bubble to merge to form a large bubble, thus reducing the number of the Plato channels; and the smaller the radius of the bubble, the more the number of the formed Plato channels, and the smaller the radius of the curvature of the Plato channel, and the Plato channels are easy to be connected, thus forming a capillary phenomenon, which can make water quickly spread and accelerate the dissolution of the tablet.

[0025] Specifically, the diameter of the bubble can be 10-1500 μm, and the Plato channel with a radius of curvature of 10-1500 μm can be formed, such as the bubble diameter of 10-100 μm, 100-300 μm, 300-800 μm, 600-1000 μm, 1000-1500 μm, and the Plato channel with a radius of curvature of 10-100 μm, 100-300 μm, 300-800 μm, 600-1000 μm, 1000-1500 μm can be formed, which facilitates the penetration of water and accelerates the dissolution of the tablet.

[0026] More preferably, in the laundry tablet, the volume ratio of the bubble is 70-85%, and the diameter of the bubble is 300-800 μm, the bubbles are stacked in close contact, the Plato channel with a radius of curvature of 300-800 μm is formed, and due to the large volume ratio of the bubble, the Plato channels are connected with each other, which can quickly penetrate water and accelerate the dissolution of the tablet; in addition, during preparation, the bubble with the volume ratio and the diameter is difficult to be broken or merged, and is relatively stable.

[0027] In a preferred embodiment, the raw materials for preparing the laundry tablet include, by mass percentage, 29-70% of a surfactant, 29-70% of water, and 1-40% of an auxiliary, the raw materials with the above-mentioned ratio have a better decontamination effect and can make the formed bubble stable, so as to obtain the Plato channel.

[0028] Preferably, the surfactant includes anionic surfactant, cationic surfactant and non-ionic surfactant, the anionic surfactant includes anionic surfactant commonly used in laundry tablets, including sodium n-octyl sulfate, sodium linear dodecyl benzene sulfonate and 3-allyloxy-2-hydroxy-1-propane sulfonate sodium salt, etc.; the cationic surfactant includes quaternary ammonium salt, fatty amine, amine oxide, cetyltrimethylammonium bromide, etc.; the non-ionic surfactant includes polyoxyethylene type non-ionic surfactant, fatty acid methyl ester oxyethylene ether, fatty acid glyceride, polyol type, etc., by compounding various types of surfactants, better decontamination capacity can be obtained, and the hydrophilic-lipophilic balance value of the whole surfactant can be adjusted. In addition, the addition of cationic surfactant and non-ionic surfactant can make the strength of micro-bubbles higher, and when the volume ratio of bubbles is large, the bubbles will not merge even in the case of very close accumulation, which is equivalent to promoting the formation of micro-bubbles.

[0029] However, the addition amount of cationic surfactant cannot be too high, otherwise it will affect the decontamination effect of anionic surfactant, but too little will affect the mechanical strength of bubbles. Through comparison experiments, it is found that under the condition of the same other ingredients and ratio, when the cationic surfactant and non-ionic surfactant are all replaced by anionic surfactant, even if the amount of injected bubbles is the same, that is, the volume ratio of bubbles is the same, but the diameter of the bubbles is increased, which is easy to cause the bubbles to break or distribute unevenly, so that the number of platonic channels decreases, which is not conducive to the dissolution of the tablet. Therefore, in a preferred embodiment, the surfactant includes anionic surfactant 49-99%, cationic surfactant 0.01-5%, and non-ionic surfactant 0.01-49% by mass percentage. The surfactant with this ingredient ratio has better decontamination effect, and can make the strength of the formed bubbles higher, so that micro-bubbles can be formed by injecting gas and high-speed stirring during preparation.

[0030] Preferably, the raw materials for preparing the laundry tablet include surfactant 60%, water 37% and auxiliary agent 3% by mass percentage, wherein the surfactant includes anionic surfactant 80%, cationic surfactant 1% and non-ionic surfactant 19% by mass percentage. The laundry tablet with this ingredient ratio has good decontamination effect, and because of the special ratio of anionic surfactant, cationic surfactant and non-ionic surfactant, a suitable hydrophilic-lipophilic balance value can be obtained, and at the same time, the viscosity of the system during melting is in a reasonable range, thereby preventing bubbles from overflowing and breaking, and micro-bubbles can be formed.

[0031] A second aspect of the present invention also provides a method for preparing a water-based laundry detergent sheet. The method is used to prepare the water-based laundry detergent sheet as described above. The method includes the following steps: stirring and mixing the additives and water, heating to complete dissolution; adding anionic surfactant and stirring to complete dissolution; adding nonionic surfactant and stirring to complete dissolution, cooling to 40-60°C; adding cationic surfactant, fully foaming, measuring viscosity, and after the viscosity is qualified, drying and sheeting to obtain the water-based laundry detergent sheet.

[0032] In the aforementioned preparation method, the fully foaming step is as follows: during the stirring process, air is injected and high-speed stirring and shearing are used to form microbubbles, which play a foaming role; or, a foaming agent is added and the foaming agent is decomposed at a specific temperature to generate bubbles.

[0033] During preparation, the injection of gas during the foaming step alters the viscosity and apparent density of the system. Therefore, measuring the viscosity or apparent density of the system allows us to determine the foaming status, i.e., to understand the volume percentage of bubbles in the system. Studies have shown that at temperatures between 40 and 85°C, when the system viscosity is 2000–30000 mPa·s, the bubble volume percentage is 50–90%; and at a temperature of 55°C and a viscosity of 5000–10000 mPa·s, the bubble volume percentage is 70–85%. Therefore, measuring the system viscosity at a specific temperature can help determine whether the bubble volume percentage meets the required standard.

[0034] To further illustrate the water-based laundry detergent sheet and its preparation method provided by the present invention, the following embodiments are provided.

[0035] Example 1

[0036] A water-based laundry detergent sheet is prepared by taking 60% surfactant, 37% water, and 3% additives by mass percentage. The surfactant is composed of 80% anionic surfactant, 1% cationic surfactant, and 19% nonionic surfactant.

[0037] The additives and water were stirred and mixed until completely dissolved; anionic surfactants were added and stirred until completely dissolved; nonionic surfactants were added and stirred until completely dissolved, and the temperature was lowered to 55°C; cationic surfactants were added and the mixture was allowed to foam fully. When the viscosity of the system was measured to be 7520 mPa·s (at which point the system temperature was 55°C), foaming was stopped. The mixture was then sheeted and dried to obtain a water-cleaning laundry sheet (the surface of the laundry sheet under a microscope is shown in Figure 1, and its actual object is shown in Figure 2).

[0038] Example 2

[0039] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the raw materials for preparing the water-based laundry detergent sheet are: 29% surfactant, 31% water and 40% additives; (2) when foaming stops, the viscosity of the system is 12600 mPa.s.

[0040] Example 3

[0041] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the raw materials for preparing the water-based laundry detergent sheet are: 70% surfactant, 29% water and 1% additives; (2) when foaming stops, the viscosity of the system is 5100 mPa.s.

[0042] Example 4

[0043] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the raw materials for preparing the water-based laundry detergent sheet are: 29% surfactant, 70% water and 1% additives; (2) when foaming stops, the viscosity of the system is 9820 mPa.s.

[0044] Example 5

[0045] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the surfactant is composed of 99% anionic surfactant, 0.01% cationic surfactant, and 0.99% nonionic surfactant; (2) when foaming stops, the viscosity of the system is 14600 mPa·s.

[0046] Example 6

[0047] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the surfactant is composed of 50% anionic surfactant, 5% cationic surfactant, and 45% nonionic surfactant; (2) when foaming stops, the viscosity of the system is 9290 mPa·s.

[0048] Example 7

[0049] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the surfactant composition is: 49% anionic surfactant, 1% cationic surfactant, and 50% nonionic surfactant; (2) when foaming stops, the viscosity of the system is 8810 mPa·s.

[0050] Example 8

[0051] A water-based laundry detergent sheet is prepared in a manner that is basically the same as that in Example 1, except that: (1) the surfactant composition is: 94.99% anionic surfactant, 5% cationic surfactant, and 0.01% nonionic surfactant; (2) when foaming stops, the viscosity of the system is 7850 mPa·s.

[0052] Comparative Example 1

[0053] A type of water-based laundry detergent sheet is prepared in a manner that is basically the same as in Example 1, except that after adding the cationic surfactant, the sheet is directly prepared and subsequent steps are performed without foaming.

[0054] Comparative Example 2

[0055] A water-based laundry detergent sheet is prepared in a manner that is basically the same as in Example 1, except that the air injection volume accounts for 30% of the system volume, and the viscosity of the system after foaming is 45200 mPa·s.

[0056] It should be noted that in all embodiments, the composition of the auxiliary agent is the same, consisting of 30wt% fragrance, 30wt% fabric softener, and 40wt% enzyme preparation.

[0057] Performance testing

[0058] (1) The bubble volume ratio, average bubble diameter and radius of curvature of the Plato channel of the water laundry sheets prepared in Examples 1-6 and Comparative Examples 1-2 were tested. When testing the average bubble diameter and the average radius of curvature of the Plato channel, 10 bubbles or Plato channels were randomly selected for testing and the average value was calculated. The test results are shown in Table 1.

[0059] (2) Performance tests were conducted on the water-based laundry sheets prepared in Examples 1-6 and Comparative Examples 1-2, including detergency testing and dissolution rate testing. The test results are shown in Table 1. The test methods are as follows:

[0060] Detergency test: According to GB / T13174-2021 "Determination of detergency and recycle performance of detergents for clothing", the test samples are JB-01 soiled cloth, JB-02 soiled cloth, and JB-03 soiled cloth. The detergency ratio Pi of the detergent sheet is obtained. When Pi ≥ 1.0, it is qualified and < 1.0 is unqualified.

[0061] Dissolution rate: Place an 11cm*14cm*1mm laundry sheet in 1L of water at a temperature of 5℃ and measure the dissolution time.

[0062] Table 1. Performance Test Results

[0063] As shown in Table 1, the dissolution time for Examples 1-8 is within 45 seconds, and the dissolution time decreases as the volume percentage of bubbles increases. That is, the dissolution rate of the laundry detergent sheet increases with the increase of the volume percentage of bubbles; when the volume percentage of bubbles reaches 90%, the dissolution rate is as fast as 5 seconds. Meanwhile, as shown in Examples 5-8, the amount of cationic and nonionic surfactants affects the bubble diameter. Smaller amounts of both lead to larger bubble diameters, which reduces the number of Pareto channels and thus decreases the dissolution rate.

[0064] Comparative Example 1, lacking foaming, failed to form Pareto channels, resulting in a longer dissolution time and ultimately poor detergency. Comparative Example 2, with less than 50% air bubbles and larger distances between them, resulted in Pareto channels with larger radii of curvature, preventing them from connecting and further contributing to a longer dissolution time.

[0065] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A clear water laundry sheet, characterized in that, The raw materials for preparing the laundry tablet include surfactants, water and additives; the laundry tablet contains bubbles, and Plato channels are formed between the bubbles; the volume ratio of the bubbles is 50-90%.

2. The clear water laundry tablet according to claim 1, characterized in that, The volume ratio of the bubbles is 70-85%.

3. The clear water laundry tablet according to claim 2, characterised in that, The diameter of the bubbles is 10-1500 microns.

4. The clear water laundry sheet according to claim 1, characterized in that, The radius of curvature of the Plato channels is 10-1500 microns.

5. The clear water laundry sheet according to claim 1, characterized in that, The raw materials for preparing the laundry tablet include, by mass percentage, 29-70% of surfactants, 29-70% of water and 1-40% of additives.

6. The clear water laundry tablet according to claim 5, characterised in that, The surfactants include anionic surfactants, cationic surfactants and nonionic surfactants.

7. The clear water laundry sheet according to claim 6, characterized in that, The surfactants include, by mass percentage, 49-99% of anionic surfactants, 0.01-5% of cationic surfactants and 0.01-50% of nonionic surfactants.

8. The clear water laundry sheet according to claim 7, characterized in that, The raw materials for preparing the laundry tablet include, by mass percentage, 60% of surfactants, 37% of water and 3% of additives; the surfactants include, by mass percentage, 80% of anionic surfactants, 1% of cationic surfactants and 19% of nonionic surfactants.

9. A method of making a clear water laundry tablet, characterised in that, The method is used for preparing the laundry tablet as claimed in any one of claims 1-8, and the method includes the steps of: stirring and mixing the additives and water, and heating to complete dissolution; adding the surfactants, and stirring to complete dissolution; foaming, measuring the viscosity of the system, and after the viscosity meets the requirements, drying, tabletting to obtain the laundry tablet.

10. The method of making a clear water laundry sheet according to claim 9, characterized in that, In the system viscosity step, the system viscosity meeting the requirements is 2000-30000 mPa.s at 40-85℃.

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