Organic alkali composition and application thereof

Abstract

The invention discloses an organic alkali composition and application thereof, and belongs to the technical field of cleaning agents. Comprising tromethamine, dodecylbenzene sulfonic acid, coconut oil fatty acid and a pH buffering agent. The organic alkali composition provided by the invention is placed at room temperature for 12 weeks, the color change tested by a colorimeter is less than 6, and compared with a conventional organic alkali composition, the organic alkali composition has better color stability and can effectively wash off peculiar smell molecules on clothes.

Description

Technical Field

[0001] The invention relates to the technical field of detergents, and in particular to an organic alkali composition and application thereof. Background Art

[0002] Changes in the appearance of laundry detergent products will bring consumers a bad sensory experience. Therefore, maintaining the appearance storage stability of laundry detergents during a long shelf life has always been a special concern of the industry, and the stability of the appearance color has always been a pain point in the industry. Especially for the newly emerging laundry beads products on the market, the industry has analyzed and summarized the reasons why the appearance of laundry beads is easy to change. The main reasons are: 1) Organic bases, such as monoethanolamine and triethanolamine, are used as neutralizers to neutralize sulfonic acid. The neutralization product will gradually turn yellow at high temperatures; 2) The addition of organic bases may react with substances in the polyvinyl alcohol water-soluble film, resulting in discoloration. In order to solve this problem, some R&D engineers have changed the formula system of laundry beads, such as adjusting the surfactant structure of the formula, not using sulfonic acid or fatty acid surfactants, and using non-ionic surfactants. However, the adjustment of the surfactant structure in the formula will directly affect the performance of the product, which is not a good choice. Some additional reducing agents such as sulfites are added. The reducing agent sulfite can slow down the discoloration of liquid detergents, but it may also cause white substances to precipitate outside the membrane of the laundry beads. It may also destroy the pigment structure of the laundry beads, causing fading under light or ultraviolet rays.

[0003] In addition, as consumers' awareness of cleaning increases, their attention to the odor of clothes after washing is also increasing. The market share of detergents that claim to remove odor and retain fragrance is increasing year by year. According to a survey on the causes of odor in household clothes, there are four main types of odor on clothes: 1) Aging odor. Due to factors such as stress, the body's antioxidant barrier is weakened, which can also cause young people to produce nonenal, leading to body odor. Nonenal is insoluble in water and can also remain on body clothes; 2) Foot odor. In 1990, Japanese scientists F. Kanda and E. Yagi and other researchers conducted a lot of research on foot odor. The experimental results showed that compared with people without foot odor, people with foot odor did produce more bacterial decomposition products on their socks. Among them, a compound called isovaleric acid is unique to the latter. Isovaleric acid is a colorless, viscous, and irritating liquid compound with a rancid smell. 3) Armpit odor. Researchers have conducted a lot of research on armpit odor. A person's different physical conditions can also lead to many different odors. For example, propionic acid is an excrement that smells like vinegar more often in the armpits, while isovaleric acid is another smell that smells like fermented bean curd.

[0004] There are two main methods for deodorizing and removing odors used by laundry detergents on the market: 1) covering the odor on clothes by adding essences and micro-fragrance capsules; 2) adding some long-lasting antibacterial agents and deodorizing ingredients to reduce the odor caused by bacteria when clothes are not completely dried or when clothes are dried indoors in the shade on rainy days. Chinese patent CN 117143677A discloses a green and safe deodorizing laundry detergent and its preparation method, which is achieved by using one or more of the antibacterial agents triclocarban (TCC), triclosan (TCS), diclosan (HP-100), and parachloroxylenol (PCMX) and the deodorant ricinoleate catechin ester, chitosan solution and zinc pyrophosphate compound solution. Chinese patent CN111961538B discloses an antibacterial and odor-removing laundry detergent and a preparation method thereof, which uses an antibacterial agent 3,5-dimethyl-4-chloro-phenol and an odor neutralizer 4-ethyl-4-soyyl ethyl sulfate morpholine to achieve the effects of removing odor and inhibiting bacteria in the laundry detergent.

[0005] The above-mentioned odor removal is mainly achieved by removing specific odor molecules on clothing through antibacterial agents and deodorants, but it is impossible to use a universal deodorant ingredient to achieve the effect of removing common odor molecules on clothing. Moreover, the additional addition of deodorants will increase the risk of formula compatibility between different components in the product formula on the one hand, and on the other hand, the additional deodorants will also increase the cost of the product. Summary of the invention

[0006] The object of the present invention is to provide an organic base composition which has stable color and can remove odor; another object of the present invention is to provide a laundry detergent which has stable performance and can remove odor.

[0007] The invention discloses an organic base composition, which comprises tromethamine, dodecylbenzenesulfonic acid, coconut oil fatty acid and a pH buffer.

[0008] Using tromethamine instead of ordinary organic base to neutralize dodecylbenzenesulfonic acid and coconut oil fatty acid will not easily cause yellowing or discoloration.

[0009] The organic base composition also has the effect of removing odor. After repeated research, it was found that the mechanism of removing odor is: the neutralization reaction of organic base tromethamine and dodecylbenzene sulfonic acid (LAS) and coconut oil fatty acid, the product is a strong acid weak base salt, a spatial stereo structure. It is speculated that the odor removal mechanism is related to the spatial stereo structure of the strong acid weak base salt and the charge distribution of the compound, such as Figure 1-4 As shown in FIG. 1 , the amino groups in tromethamine sulfonate and tromethamine fatty acid salts are cationic, and the cations attract the negative charges in common odor molecules (such as propionic acid and isovaleric acid), thereby capturing the odor molecules. Figure 5 As shown, tromethamine can directly react with nonenal to remove nonenal.

[0010] The function of pH buffer is to maintain pH stability and chelate metal ions, which helps to stabilize the color and has a synergistic effect.

[0011] Further, in parts by mass, the organic base composition comprises:

[0012]

[0013] Furthermore, in the organic base composition, the mass of the tromethamine: the sum of the mass of the dodecylbenzenesulfonic acid and the coconut oil fatty acid is equal to 0.38-0.60:1.

[0014] By controlling the mass ratio of tromethamine to the mass ratio of dodecylbenzenesulfonic acid to coconut oil fatty acid within this range, the performance of the organic base composition is more stable, the appearance performance is more stable, and the color change value is less than 6 when placed at 45°C or in sunlight for 12 weeks.

[0015] Furthermore, the coconut oil fatty acid is distilled coconut oil fatty acid; the distilled coconut oil fatty acid is C12-C18 distilled coconut oil fatty acid.

[0016] Distilled coconut oil fatty acids remove impurities from coconut oil and have more stable performance. C12-C18 distilled coconut oil fatty acids have better chemical stability than distilled coconut oil fatty acids below C12; and have better water solubility and cleaning effect than distilled coconut oil fatty acids above C18.

[0017] Furthermore, the dodecylbenzene sulfonic acid has a color of less than 15 and an average molecular weight of 323.

[0018] Furthermore, the pH of the organic base composition is 7.0-8.0.

[0019] The pH of the organic base composition is controlled at 7.0-8.0 to ensure complete neutralization and help maintain color stability.

[0020] Furthermore, the pH buffer is citric acid and sodium citrate.

[0021] Furthermore, the mass ratio of citric acid to sodium citrate in the pH buffer is 0.8-1.5:0.2-5.

[0022] The invention also discloses a laundry detergent, comprising the organic alkali composition as described above.

[0023] The organic alkali composition provided by the present invention can be applied to liquid detergents, such as laundry beads, ordinary liquid detergents, concentrated liquid detergents, and the organic alkali composition is compounded with anionic surfactants such as sodium fatty alcohol polyoxyethylene ether sulfate AES, sodium olefin sulfonate AOS, etc., nonionic surfactants such as fatty alcohol polyoxyethylene ether AEO-9, AEO-7, alkyl polyglycoside APG, etc., and solvents such as propylene glycol, glycerol, PEG-200, PEG-400, etc.

[0024] Furthermore, the laundry detergent comprises 30-60 wt % of the organic alkali composition according to mass fraction.

[0025] When the content of the organic alkali composition in the laundry detergent is 30-60wt%, the removal rate of odor molecules is as high as over 90%.

[0026] Furthermore, the pH of the laundry detergent is 7.0-8.0. Controlling the pH of the laundry detergent within this range helps to maintain the color stability of the laundry detergent.

[0027] The organic alkali composition provided by the present invention has a color change of less than 6 when placed at room temperature for 12 weeks using a colorimeter, has better color stability than conventional organic alkali compositions, and can effectively remove odor molecules on clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the reaction principle of tromethamine sulfonate and propionic acid in the organic base combination group disclosed in the present invention;

[0029] Figure 2 It is a schematic diagram of the reaction principle of tromethamine sulfonate and isovaleric acid in the organic base combination group disclosed in the present invention;

[0030] Figure 3 A schematic diagram of the reaction principle of tromethamine fatty acid salt and propionic acid in the organic base combination group disclosed in the present invention;

[0031] Figure 4 A schematic diagram of the reaction principle of tromethamine fatty acid salt and isovaleric acid in the organic base combination group disclosed in the present invention;

[0032] Figure 5 A schematic diagram of the reaction principle of tromethamine and nonenal in the organic base combination group disclosed in the present invention. DETAILED DESCRIPTION

[0033] To make the technical solution of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0034] In the following embodiments, the following abbreviations will be used and have the functions indicated.

[0035] Distilled coconut oil fatty acid: anionic surfactant, coconut oil fatty acid is distilled, the carbon number of the alkyl group is C12~C18.

[0036] Dodecylbenzenesulfonic acid (LAS): anionic surfactant, color <15, average molecular weight 323.

[0037] Alcohol polyoxyethylene ether sulfate (AES), anionic surfactant, carbon chain length of fatty alcohol is 12-14, average EO number is 2, no additional buffer salt is added.

[0038] Fatty alcohol polyoxyethylene ether (AEO-9), a non-ionic surfactant, the carbon chain length of the fatty alcohol is 12-14, and the average EO number is 9.

[0039] Fatty alcohol polyoxyethylene ether (AEO-7), a non-ionic surfactant, the carbon chain length of the fatty alcohol is 12-14, and the average EO number is 7.

[0040] Examples 1-7

[0041] According to the dosage of the formula in Table 1, weigh each component. Tromethamine is a white solid powder, which needs to be dissolved in water in advance, and then stirred with dodecylbenzenesulfonic acid and distilled coconut oil fatty acid at room temperature to fully react evenly. The pH of the composition is adjusted to 7.0-8.0. The laundry detergent matrix is ​​water, and the laundry beads matrix is ​​propylene glycol. The matrix of Examples 1, 2, and 5 is deionized water, and the matrix of Examples 3, 4, 6, and 7 is propylene glycol.

[0042] Table 1 Component contents of Examples 1-7 (%)

[0043] Raw material name Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Tromethamine 7 9 14 15 5 18 16 Dodecylbenzenesulfonic acid 13 15 22 26 13 22 20 Distilled coconut oil fatty acids 3 3 7 7 3 7 5 Citric Acid 0.8 0.6 1.5 1 0.8 1.5 1 Sodium Citrate 1 2 0.5 0.2 5 0.5 0.3 Propylene glycol 0 0 45 40.8 0 41 47.7 water 75.2 70.4 10 10 73.2 10 10

[0044] Performance test and results:

[0045] The appearance stability was evaluated with reference to the appearance test method in "QB / T 1224-2012 Liquid Detergents for Clothing", where: under the test conditions, the composition was a uniform liquid, without stratification, and without obvious impurities or suspended matter (except for the suspension system) and was recorded as "qualified"; under the test conditions, the composition was stratified, or had obvious impurities or suspended matter precipitated and was recorded as "unqualified". The test results are shown in Table 2. The mass ratio of the three components of tromethamine (w1), dodecylbenzenesulfonic acid (LAS) (w2), and distilled coconut oil fatty acid (w3) in Examples 1-7 was w1:(w2+w3), and the mass ratio of citric acid and sodium citrate in the composition as the pH buffer was (w4)

[0046] Table 2 Performance stability test results of Examples 1-7

[0047] Raw material name Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 <![CDATA[w1:(w2+w3)]]> 0.44 0.50 0.48 0.45 0.31 0.62 0.64 <![CDATA[w4%]]> 1.8 2.6 2.0 1.2 5.8 2.0 1.3 Appearance stability (12w) qualified qualified qualified qualified Failure qualified qualified

[0048] As shown in Table 2, compared with other embodiments, when the mass ratio of tromethamine (w1), dodecylbenzenesulfonic acid (LAS) (w2), and distilled coconut oil fatty acid (w3) is: w1:(w2+w3)<0.38:1, the stability of the organic alkaline composition in Embodiment 5 is unqualified.

[0049] Examples 1-7 and Comparative Examples 1-4 were placed at -5°C, room temperature, 37°C, 45°C, and sunlight for inspection, and the appearance and color values ​​of the compositions under different conditions were recorded. The color values ​​were tested using a colorimeter. b Value (yellow-blue value), default D value of the composition at -5℃ b The value (yellow-blue value) is the initial value, and the color change (Y) under different conditions is calculated.

[0050] Y = Db2 - Db1;

[0051] Where Y: the change of color under different conditions;

[0052] Db2: D of the composition under different stability conditions b value;

[0053] Db1: default D of the composition at -5℃ b The values ​​(yellow-blue values) are initial values.

[0054] When the color change Y>6, it is recorded as "unqualified", and when the color change Y≤6, it is recorded as "qualified". The test results are shown in Table 3.

[0055] Table 3 Color aging test of Examples 1-7

[0056]

[0057]

[0058] As shown in Table 3, the color changes of Examples 1-7 were all qualified when placed at room temperature for 12 weeks, but the color changes of Examples 6 and 7 were larger than those of other Examples under the conditions of 37°C, 45°C and sunlight, and the color stability was poor. Therefore, when the mass ratio of tromethamine (w1), dodecylbenzenesulfonic acid (LAS) (w2), and distilled coconut oil fatty acid (w3) was: w1:(w2+w3)>0.6:1, the color stability of the organic alkaline composition would deteriorate.

[0059] Comparative Examples 1-4

[0060] In the prior art, monoethanolamine or triethanolamine is generally used to neutralize sulfonic acid and fatty acid. Comparative Examples 1-4 are used in accordance with the dosage of the formula in Table 4, and the components are weighed, stirred at room temperature for full reaction, and the pH of the composition is adjusted to be controlled at 7.0-8.0. Comparative Examples 1-4 are subjected to color aging test, and the results are shown in Table 5. When triethanolamine or monoethanolamine is used instead of tromethamine, the color of the organic base composition changes greatly, especially under the test conditions of 45°C, 37°C, and sunlight, the color change value is greater than 6.

[0061] Table 4 Component contents of comparative examples 1-4

[0062]

[0063]

[0064] Table 5 Comparative Examples 1-4 Color Aging Test

[0065]

[0066] Examples 8-12

[0067] According to the dosage of the formula in Table 6, weigh each component, stir at room temperature to fully react evenly, and adjust the pH of the laundry detergent to control at 7.0-8.0.

[0068] Examples 8-13 are used in laundry detergents. The organic base composition used contains 9 parts by mass of tromethamine, 15 parts by mass of LAS, 3 parts by mass of distilled coconut oil fatty acid, 0.6 parts by mass of citric acid, and 2.0 parts by mass of sodium citrate.

[0069] Examples 14-17 are used in laundry detergent beads. The organic base composition used contains 15 parts by mass of tromethamine, 26 parts by mass of LAS, 7 parts by mass of distilled coconut oil fatty acid, 1 part by mass of citric acid, and 0.2 parts by mass of sodium citrate.

[0070] Table 6 Content of each component in laundry detergent of Examples 8-17

[0071]

[0072] Comparative Example 5

[0073] The detergency of standard laundry detergent meets the requirements of Appendix B of GB / T 13174 "Determination of detergency and cyclic washing performance of detergents for clothing".

[0074] Comparative Example 6

[0075] Commercially available laundry beads have a surfactant content of 62% and a water content of ~12%.

[0076] Performance Test:

[0077] The pH test conditions refer to QB / T 1224-2012 Liquid Detergents for Clothes, and the prepared liquid detergent composition is prepared into a sample solution with a mass fraction of 1%, and tested with a pH meter at 25°C. The appearance stability is evaluated with reference to the appearance test method in "QB / T1224-2012 Liquid Detergents for Clothes". The results are shown in Table 7, and the pH and stability of Examples 8-15 meet the requirements. Examples 14-17 are applied in laundry detergent beads. Examples 14-17 are coated with a domestic water-soluble film (denoted as film A) to obtain a series of laundry detergent beads samples, which are placed under different conditions: sealed in a storage bottle at "-5°C", room temperature, sealed in a storage bottle, 37°C, relative humidity (85±5)%, 45°C, relative humidity (85±5)%, and tested for stability at 12W. The appearance stability includes an evaluation of the appearance of the film, wherein "the inner and outer surfaces of the film are smooth, without precipitates or oil seepage" is recorded as "qualified"; and "the inner and outer surfaces of the film are rough, with precipitates or oil seepage" is recorded as "unqualified".

[0078] Table 7 pH value and test stability of Examples 8-12

[0079]

[0080] As shown in Table 7, the pH and stability of Examples 8-15 all meet the requirements. However, the stability of Examples 16-17 does not meet the requirements, the proportion of the organic base composition is greater than 60wt%, and the compatibility of the formula and the membrane is poor.

[0081] For the odor removal effect, the detection method refers to the standard "QBT2761-2006-Method for Determination of Purification Effect of Indoor Air Purification Products". The specific steps are as follows: Take 5 pieces of clothing (weight control is about 7kg), and use a conventional spray bottle to spray the artificially prepared odor solution: 15ml of 1% nonenal aqueous solution, 15ml of 1% propionic acid aqueous solution, and 15ml of 1% isovaleric acid aqueous solution. Then place the clothing in the center of the corresponding test chamber, close the door immediately, let it stand for 24 hours, and take samples. After the gas sample is collected and concentrated, use GC chromatography to analyze each odor molecule, and use the external standard method for quantification. Repeat the experiment 3 times, and take the average value as P1. The clothes were taken out from the test chamber, 10g of the liquid detergent in the embodiment was added, and the clothes were washed with a turbine washing machine. The washing procedure was the standard washing procedure, the water volume was set to 45L, washing once, rinsing twice, and drying once. The washed clothes were dried with a dryer, and the dried clothes were placed in the center of the test chamber. The door was immediately closed, and the clothes were allowed to stand for 24 hours for equilibration. The gas samples were collected and concentrated, and the odor molecules were analyzed by GC chromatography, and the external standard method was used for quantification. The experiment was repeated 3 times, and the average value was recorded as P2. At the same time, a comparative example was made, that is, the 10g liquid detergent in the embodiment was changed to 10g standard laundry liquid and 8g laundry beads during the washing process, and other experimental conditions and processes remained the same.

[0082] The test results are shown in Table 8.

[0083] Odor removal rate: X = (P1-P2) / P1×100%;

[0084] When the odor removal rate is greater than 90%, it is judged to have a relatively good odor removal effect.

[0085] When the odor removal rate is less than 90%, it is determined that the odor removal effect is not good.

[0086] Table 8 The removal effect of Examples 8 to 17 and Comparative Examples 1-2 on odor molecules

[0087]

[0088]

[0089] Compared with comparative examples 5-6, examples 8-17 have higher ability to remove odor molecules. When the mass content of the organic base composition in the laundry detergent is 30-60%, the removal rate of nonenal, propionic acid and isovaleric acid is as high as more than 90%. Beyond this range, the appearance stability is unqualified or the odor removal rate does not reach the expected effect.

[0090] In order to further verify that Examples 14-15 can be used in laundry detergent beads, they have good compatibility with the commonly used polyvinyl alcohol water-soluble films on the market and stable color, domestic water-soluble films (denoted as film A) and cases 14 to 15 were encapsulated to obtain a series of laundry detergent beads samples, which were placed under different conditions: "-5°C" sealed in a storage bottle, room temperature, 37°C, relative humidity (85±5)%, 45°C, relative humidity (85±5)%, and the color change of 12W was tested.

[0091] Table 9 Stability and color change test of laundry beads in Examples 14-15

[0092]

[0093] As shown in Table 9, the laundry beads made from the membranes of Example 14 / A to Example 15A have good compatibility between the liquid and the membrane, and the long-term storage stability and color change values ​​are acceptable.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An organic base composition, characterized in that include: Tromethamine, dodecylbenzene sulfonic acid, coconut oil fatty acid, pH buffer.

2. An organic base composition according to claim 1, characterized in that: In parts by mass, including:

3. An organic base composition according to claim 1, characterized in that: In the organic base composition, the mass of the tromethamine: the sum of the mass of the dodecylbenzenesulfonic acid and the coconut oil fatty acid is equal to 0.38-0.60:

1.

4. An organic base composition according to claim 1, characterized in that: The coconut oil fatty acid is distilled coconut oil fatty acid; the distilled coconut oil fatty acid is C12-C18 distilled coconut oil fatty acid.

5. An organic base composition according to claim 1, characterized in that: The dodecylbenzene sulfonic acid has a color of less than 15 and an average molecular weight of 323.

6. An organic base composition according to claim 1, characterized in that: The pH of the organic base composition is 7.0-8.

0.

7. An organic base composition according to claim 1, characterized in that: The pH buffers are citric acid and sodium citrate.

8. An organic base composition according to claim 7, characterized in that: The mass ratio of citric acid to sodium citrate in the pH buffer is 0.8-1.5:0.2-5.

9. A laundry detergent, characterized in that: The invention comprises an organic base composition as described in any one of claims 1 to 8.

10. A laundry detergent according to claim 9, characterized in that: According to the mass fraction, the organic alkali composition is included in an amount of 30-60%; and the pH value of the laundry detergent is 7.0-8.0.

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