Laundry detergent containing poly (N-vinyl pyrrolidone-co-methacrylic acid) and preparation method thereof

Abstract

The invention relates to a laundry detergent containing poly (N-vinyl pyrrolidone-co-methacrylic acid) and a preparation method thereof, and belongs to the technical field of laundry detergent production. The laundry detergent provided by the invention comprises the following components in percentage by mass: 0.05-0.2% of a chelating agent; 10 to 25% of an anionic surfactant; 0.5%-1.0% of a basifying agent; 1-8% of a nonionic surfactant; 0.1 to 0.5 percent of an antioxidant; 0.05 to 0.3 percent of preservative; 0.1 to 1.5 percent of poly (N-vinyl pyrrolidone-co-methacrylic acid); and the balance of deionized water. In practical application, the problem that a functional auxiliary agent is difficult to compound into a system or anions and cations are difficult to coexist can be solved to a certain extent by a method of directly adding the functional auxiliary agent into the formula system of the laundry detergent. In addition, by adding a low addition amount of the polymer into the laundry detergent product, the laundry detergent product can simultaneously provide three excellent and balanced properties of redeposition resistance, softness and fluffiness.

Description

Technical Field

[0001] This invention relates to the field of laundry detergent production technology, and in particular to a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method. Background Technology

[0002] With the rapid development of the liquid detergent industry and people's increasing demands for quality of life, laundry detergents with only cleaning functions can no longer meet consumer needs. Functional additives, such as anti-redeposition agents, fabric softeners, fluffing agents, antibacterial agents, and fragrances, are often added to meet consumers' multi-functional requirements. These demands have also driven the diversification and personalization of laundry products. Anti-redeposition refers to the behavior of inhibiting the redeposition of dirt particles washed out during the washing process onto fabric fibers. This is mainly reflected in two aspects: first, preventing the deposition of inorganic salts; and second, preventing stains removed during washing from redepositing onto the fabric. Various functional additives not only enhance detergency and increase washing speed, but also extend the lifespan of fabrics and give clothes a soft and smooth feel when worn and used.

[0003] Currently, to achieve these functional requirements, detergents on the market require the addition of individual functional additives, which typically possess only one or two properties. Commonly used anti-redeposition polymers include acrylic / styrene copolymers, modified acrylic polymers, polyester polyether polymers, polyethyleneimine ethoxylates, nonionic polymers, and sodium polyacrylate. Adding sodium polyacrylate, modified polyethylene glycol, styrene-acrylic copolymers, and modified polyethyleneimine, or combinations of two of these substances, to laundry detergent can improve its anti-redeposition properties. While these substances effectively prevent dirt redeposition, they generally lack softening properties and cannot impart a fluffy feel to fabrics. Typically, softening agents include ester-based quaternary ammonium salts, imidazoline quaternary ammonium salts, amide quaternary ammonium salts, dialkyl dimethyl quaternary ammonium salts, and organosilicones. For example, common cationic modified cellulose can simultaneously enhance both softening and stain removal properties. Achieving softening properties typically involves adding the aforementioned ingredients to the system. A significant portion of these functional additives are cationic, which can lead to several unavoidable problems: Firstly, direct addition to laundry detergent may result in the incompatibility of anions and cations, and using them as softeners usually requires higher dosages. Secondly, while cationic compounds provide softness by forming a hydrophobic, lubricating film on the fabric surface, they may reduce bulk, causing the fabric to collapse. Therefore, it's impossible to simultaneously achieve both softening and improved bulk.

[0004] In existing technologies, some researchers have achieved softening properties by encapsulating small-molecule cationic softeners into polymers before adding them to laundry detergent systems, thus enabling the coexistence of anions and cations within the same system. Alternatively, multiple additives can be formulated to address this issue, but this leads to complex formulations, increased costs, and potential interactions between components that can affect the final result. These methods have inherent limitations in practical applications. Therefore, the development of functional additives with multiple benefits, especially those simultaneously possessing anti-redeposition, softening, and fluffing properties, and which are easily incorporated into systems for practical application, is particularly urgent.

[0005] Currently, functional additives intended for use in laundry products suffer from the following drawbacks: First, most functional additives possess only one or two properties, particularly when ensuring basic anti-redeposition properties, making it difficult to simultaneously improve both softening and fluffiness. Second, enhancing softening performance by adding cationic components presents several intractable problems: on the one hand, there may be difficulties in the coexistence and stable compounding of anions and cations within the laundry detergent system; on the other hand, relatively high concentrations are typically required in softener systems to achieve the desired effect. Furthermore, existing softening technologies primarily focus on the soft touch of fabrics, neglecting the improvement of fabric fluffiness.

[0006] Therefore, it is essential to develop a functional additive that can overcome the limitations of existing technologies, possess multiple properties, and be convenient for practical applications. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method. The polymer of this invention is poly(N-vinylpyrrolidone-co-methacrylic acid), i.e., P(NVP-co-MAA). In practical applications, by directly adding it to the laundry detergent formulation system, the problems of difficulty in compounding functional additives into the system or the inability of anions and cationic compounds to coexist can be solved to some extent. Furthermore, adding a low amount of the polymer to the laundry detergent product can simultaneously provide excellent and balanced anti-redeposition, softening, and fluffing properties.

[0008] This invention is achieved through the following technical solution:

[0009] The first objective of this invention is to provide a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid), comprising the following components by weight percentage:

[0010] Chelating agent 0.05-0.2%;

[0011] Anionic surfactant 10-25%;

[0012] Alkalizing agent 0.5-1.0%;

[0013] Nonionic surfactants 1-8%;

[0014] Antioxidant 0.1-0.5%;

[0015] Preservative 0.05-0.3%;

[0016] Poly(N-vinylpyrrolidone-co-methacrylic acid) 0.1-1.5%;

[0017] The remainder is deionized water.

[0018] In one embodiment of the present invention, the pH value of the laundry detergent is 7.5-8.0.

[0019] In one embodiment of the present invention, the poly(N-vinylpyrrolidone-co-methacrylic acid) is obtained by the following method: dissolving vinylpyrrolidone and methacrylic acid in an organic solvent, adding an initiator, reacting under a nitrogen atmosphere, and then washing and drying.

[0020] In one embodiment of the present invention, the chelating agent is selected from one or more of disodium EDTA, trisodium ethylenediamine disuccinate, sodium citrate, tetrasodium glutamate diacetate, and methylglycine diacetate.

[0021] In one embodiment of the present invention, the anionic surfactant is selected from one or more of alkylbenzene sulfonic acid, 70% sodium ethoxylated sulfate, sodium alkyl sulfonate, sodium alkylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and alkenyl sulfonate.

[0022] In one embodiment of the present invention, the alkalizing agent is selected from one or more of caustic soda flakes, potassium hydroxide, sodium silicate, sodium succinate, sodium carbonate, and sodium bicarbonate.

[0023] In one embodiment of the present invention, the nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ether 9EO, fatty alcohol polyoxyethylene ether 7EO, fatty alcohol polyoxyethylene ether 5EO, fatty alcohol polyoxyethylene ether 3EO, alkyl glycosides, and alkanolamides.

[0024] In one embodiment of the present invention, the antioxidant is selected from sodium metabisulfite and / or butylated hydroxytoluene.

[0025] In one embodiment of the present invention, the preservative is selected from one or more of Kathon, Bropol, DMDM ​​hydantoin and imidazolidinyl urea.

[0026] A second objective of this invention is to provide a method for preparing the laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid), characterized by comprising the following steps:

[0027] The chelating agent, anionic surfactant, alkalizing agent, and nonionic surfactant are stirred evenly at 80-85°C, cooled to room temperature, and then antioxidants and preservatives are added. Poly(N-vinylpyrrolidone-co-methacrylic acid) is then added and stirred evenly. The pH is adjusted, and deionized water is added to obtain the laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid).

[0028] The mechanism of this invention is as follows:

[0029] The P(NVP-co-MAA) molecule has a unique structure. The NVP segments exhibit weak cationicity due to polarization, while the MAA segments, upon dissociation of the carboxyl groups, form -COO-. Through dipole-ion electrostatic interactions and hydrophobic interactions, a monolayer is formed on the fabric surface, with the carboxylate groups facing outwards. This electrostatic repulsion prevents the redeposition of dirt particles on the fabric surface. After the fabric dries, the NVP segments regain their softening effect. Furthermore, both NVP and MAA are biocompatible materials, making them safe and non-toxic.

[0030] The technical solution of the present invention has the following advantages compared with the prior art:

[0031] (1) This invention provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method. For ease of use, in practical applications, poly(N-vinylpyrrolidone-co-methacrylic acid) (P(NVP-co-MAA)) is directly added to the laundry detergent system, exhibiting good stability at both high and low temperatures. The laundry detergent containing this copolymer was tested for its anti-redeposition, fluffing, and softening properties. The results showed that compared with the blank sample, its performance was improved to varying degrees.

[0032] (2) Compared with polyvinylpyrrolidone and vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer, it has unique advantages in terms of anti-redeposition, softness, and fluffiness. It successfully solves the compatibility problem caused by the compounding of multiple functional polymers, simplifies the formulation process, and provides a brand-new solution for developing high-performance, multifunctional washing and care products. Attached Figure Description

[0033] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0034] Figure 1 This is a comparison chart of the anti-redeposition effect of the present invention;

[0035] Figure 2 This invention allows for the observation of fluffiness in the horizontal direction;

[0036] Figure 3 This invention provides a height comparison of the superimposed fluffy effect;

[0037] Figure 4 This invention allows for the observation of fluffiness in an inclined direction;

[0038] Figure 5 This is the stability test result of Example 4 of the present invention; Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0040] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available.

[0041] The preparation method of poly(N-vinylpyrrolidone-co-methacrylic acid) used in this embodiment of the invention is as follows: vinylpyrrolidone and methacrylic acid are dissolved in 30 mL of isopropanol, azobisisobutyronitrile (AIBN) is added, and the reaction is carried out at 65 °C for 3 h under nitrogen atmosphere. After the reaction, the precipitate is washed with 300 mL of anhydrous ethanol, and the reaction is repeated four times. Then, the precipitate is washed with petroleum ether, and the reaction is repeated twice. The washed product is dried at 45 °C to constant weight to obtain P(NVP-co-MAA). The molar ratio of NVP to MAA is 6:4, and the total molar amount of NVP and MAA is 0.05 mol. The amount of AIBN used is 3% of the total molar amount of NVP and MAA.

[0042] The polyvinylpyrrolidone used in the comparative examples of this invention was purchased from Ashland LLC, catalog number pvp k-90powder;

[0043] The vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer used in the comparative examples of this invention is Ashland LLC, catalog number Sorez™ HS 205 copolymers.

[0044] Example 1

[0045] This embodiment provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid), comprising the following components by weight percentage:

[0046] Disodium EDTA 0.1%;

[0047] Alkylbenzene sulfonic acid (100%) 5%;

[0048] 0.8% caustic soda flakes;

[0049] 70% sodium ethoxylated sulfate 12.5%;

[0050] Fatty alcohol polyoxyethylene ether (9EO) 2%;

[0051] Sodium metabisulfite 0.25%;

[0052] Kathon 0.10%;

[0053] Polymer P (NVP-co-MAA) 0.25%;

[0054] The remainder is deionized water.

[0055] The preparation method of laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) is as follows:

[0056] Disodium EDTA, alkylbenzene sulfonic acid (100%), caustic soda flakes, 70% sodium ethoxylated sulfate, and fatty alcohol polyoxyethylene ether (9EO) were stirred evenly at 85°C, cooled to room temperature, and sodium metabisulfite and Kathon were added. Copolymer P (NVP-co-MAA) was added to the formulation system and stirred evenly. Then, the pH value was adjusted to 7.7 using sodium hydroxide, and the amount of deionized water was added to 100%.

[0057] Example 2

[0058] This embodiment provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method, which is similar to Example 1, except that the amount of polymer P (NVP-co-MAA) added is 0.5%, and the other steps are the same.

[0059] Example 3

[0060] This embodiment provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method, which is similar to Example 1, except that the amount of polymer P (NVP-co-MAA) added is 0.75%, and the other steps are the same.

[0061] Example 4

[0062] This embodiment provides a laundry detergent containing poly(N-vinylpyrrolidone-co-methacrylic acid) and its preparation method, which is similar to Example 1, except that the amount of polymer P (NVP-co-MAA) added is 1.0%, and the other steps are the same.

[0063] Comparative Example 1

[0064] This comparative example provides a laundry detergent formulation and preparation method, similar to Example 1, except that: no polymer P (NVP-co-MAA) is added;

[0065] Citric acid was used to adjust the pH to 7.7 in the preparation method.

[0066] Comparative Example 2

[0067] This comparative example provides a laundry detergent formulation and preparation method, similar to Example 4, except that polymer P (NVP-co-MAA) is replaced with polyvinylpyrrolidone.

[0068] Citric acid was used to adjust the pH to 7.7 in the preparation method.

[0069] Comparative Example 3

[0070] This comparative example provides a laundry detergent formulation and preparation method, similar to Example 4, except that polymer P (NVP-co-MAA) is replaced with vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer.

[0071] Citric acid was used to adjust the pH to 7.7 in the preparation method.

[0072] Comparative Example 4

[0073] This comparative example provides a commercially available laundry detergent with cleaning and conditioning properties.

[0074] Performance testing:

[0075] (1) Anti-redeposition test

[0076] The laundry detergents obtained in Examples 1-4 and Comparative Examples 1-3 were used for anti-redeposition tests. The tests were conducted according to the experimental method 7.4 of GB / T 13174-2021 "Determination of detergency and recycle performance of detergents for clothing" under the following experimental conditions. The ash content of the fabric before and after the experiment was calculated. The lower the ash content, the better the anti-redeposition effect.

[0077] The washing conditions are as follows:

[0078] Vertical decontamination machine: 120 rpm;

[0079] Detergent dosage: 2 g / L;

[0080] Fabric: JB-00 (white cotton cloth), add 6 pieces (6 cm × 6 cm) of each to the washing tub;

[0081] Washing temperature: 30℃;

[0082] Water hardness: 250 mg / kg (calculated as CaCO3, Ca / Mg=3:2);

[0083] Washing time: 20 min;

[0084] Rinse time: Rinse twice with 1500 mL of tap water, each time alternating between 5 clockwise and 5 counterclockwise rotations for 30 seconds;

[0085] Washing cycles: 20 times; Sewage: JB-W1 sewage solution.

[0086] The results are shown in Table 1 and Figure 1 As shown:

[0087] Table 1. Anti-redeposition effect of Examples 1-3 and Comparative Example 1

[0088]

[0089] From Table 1 and Figure 1 The anti-redeposition effect shows that the formulations of Examples 1, 2, 3 and 4 all contain different amounts of P (NVP-co-MAA). The anti-redeposition effect of Examples 1-4 is significantly better than that of Comparative Example 1, indicating that the added P (NVP-co-MAA) can give the laundry detergent a significant anti-redeposition effect, and the degree of improvement in the anti-redeposition effect is Example 3 > Example 1 > Example 4 > Example 2.

[0090] Comparative Examples 2 and 3 used equal amounts of commercially available polyvinylpyrrolidone and functionalized copolymer (vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer) to replace P (NVP-co-MAA) for effect comparison tests, but their anti-redeposition effect was significantly lower than that of Examples 1-4.

[0091] (2) Looseness test

[0092] The same number of towels after washing in the anti-redeposition test of Examples 4 and Comparative Examples 1-4 were stacked together, and the fluffiness was evaluated by the height value and the consistency of the arrangement direction of the loops on the towels. The higher the height value and the consistency, the better the fluffiness.

[0093] The height values ​​are shown in Table 2. The loft values ​​observed in the horizontal direction and the loft values ​​observed in the inclined direction are as follows: Figure 2 and Figure 4 As shown, the height of the stacked fluffy effect is as follows: Figure 3 As shown.

[0094] Table 2. Fluffing effect of Comparative Examples 1-4 and Example 4

[0095]

[0096] From Table 2, Figures 2-4 It can be seen that the fluffing effect of Example 4 is better than that of Comparative Example 1, indicating that the addition of P (NVP-co-MAA) to the laundry detergent formula system significantly improves the fluffing effect in both the horizontal and inclined directions. The fluffing effects of Comparative Examples 2 and 3 are worse than those of Comparative Examples 1, 4 and Example 4 in both the horizontal and inclined directions. Specifically, from two perspectives: (1) In the horizontal direction, compared with Comparative Example 1, the height of Example 4 increased by 13.4% after folding due to the addition of 1% P (NVP-co-MAA).

[0097] Compared to Comparative Examples 2 and 3, the stacking height of Examples 4 and 1 was superior, demonstrating the unique advantage of P(NVP-co-MAA) in improving fluffiness. Polyvinylpyrrolidone and vinylpyrrolidone / dimethylaminoethyl methacrylate copolymers did not have a significant fluffiness effect.

[0098] Compared to Comparative Example 4, the order of stacking height is Example 4 > Comparative Example 4 > Comparative Example 1. The fluffy effect of Comparative Example 4 is better than that of Comparative Example 1 but worse than that of Example 4. This also illustrates to some extent that P(NVP-co-MAA) has great potential in application.

[0099] The order of the overall stacking height is: Example 4 > Comparative Example 4 > Comparative Example 1 > Comparative Example 3 > Comparative Example 2.

[0100] (2) Observed from the oblique direction: The arrangement direction of the loops on the towel of Comparative Example 1 is very messy. Compared with Comparative Example 1, the arrangement direction of the loops on the towel of Example 4 becomes more consistent due to the addition of "P(NVP-co-MAA)".

[0101] Compared with Comparative Example 2 and Comparative Example 3, the arrangement direction of the loops on the towel was improved to a certain extent due to the addition of polyvinylpyrrolidone and functionalized copolymer (vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer), but the loops were arranged too tightly, so the stacking height was significantly reduced compared with Comparative Example 1 and Example 4.

[0102] Compared to Comparative Example 4, the consistency of the loop arrangement direction on the towel was higher than that in Comparative Example 1 but lower than that in Example 4.

[0103] Overall, the consistency of the loop arrangement direction is as follows: Example 4 > Comparative Example 4 > Comparative Example 1 > Comparative Example 3 > Comparative Example 2.

[0104] (3) Compliance test

[0105] Longer, all-cotton towels were selected as the substrate for the softness test, with four towels used for each sample. Before testing, the towels were pre-washed with commercially available laundry detergent to remove any residual fabric softener. A Panasonic XQG80-E8S2T front-loading washing machine was used with a detergent concentration of 2 g / L, using 21 L of water. The washing temperature was set to 30℃, tap water was connected, and the washing machine was set to the "cotton fabric wash mode," running five cycles. The towels were then hung to dry at room temperature.

[0106] The smoothness performance was evaluated using a sensory evaluation panel method; the higher the score, the better the smoothness.

[0107] The sensory evaluation panel consisted of 16 people. Each parallel comparison group of towels contained four towels corresponding to two different laundry detergent samples. Softness was assessed blindly. The scoring rules were: roughest (1 point); average (2 points); softest (3 points). The total score was obtained by adding up the scores given by each person. The specific scoring details and results are shown in Table 3 below.

[0108] Table 3. Smoothing effect of Example 4 and Comparative Examples 1-3

[0109]

[0110] As shown in Table 3, the overall softness evaluation scores of Example 4 are higher than those of Comparative Example 1, indicating a certain degree of improvement in softness. The overall scores of Comparative Example 2 are lower than those of both Example 4 and Comparative Example 1, indicating that polyvinylpyrrolidone (PVP) somewhat reduces softness. The overall score of Comparative Example 3 is higher than that of Comparative Example 1 but lower than that of Example 4, indicating that the vinylpyrrolidone / dimethylaminoethyl methacrylate copolymer can improve softness to some extent; however, the improvement is less significant than that of Example 4, which demonstrates a superior softness effect. This also showcases the superiority and potential of P(NVP-co-MAA) in softness performance applications.

[0111] (4) Stability

[0112] Different concentrations of this P (NVP-co-MAA) were added to the base formulation solution, and the samples were stored at room temperature, 4℃, 37℃, and 45℃ for three months, followed by cyclic storage at -18 / 48℃ and -20℃ for one month. After each test cycle, the appearance (transparency, layering) of the samples was observed and recorded. The stability of the samples was determined according to relevant industry standards. The results are shown in Table 4 and... Figure 5 (As shown in the test of Example 4):

[0113] Table 4. Stability test results of Examples 1-4 and Comparative Example 1

[0114]

[0115] From Table 4 and Figure 5 It can be seen that the stability of the system after adding P(NVP-co-MAA) to the basic laundry detergent is qualified, indicating that P(NVP-co-MAA) has good compatibility with other raw materials in the system.

[0116] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A compound containing poly(N-vinylpyrrolidone- co A laundry detergent containing (-methacrylic acid), characterized in that, By mass percentage, it includes the following components: Chelating agent 0.05-0.2%; Anionic surfactant 10-25%; Alkalizing agent 0.5-1.0%; Nonionic surfactants 1-8%; Antioxidant 0.1-0.5%; Preservative 0.05-0.3%; Poly(N-vinylpyrrolidone-) co 0.1-1.5% (-methacrylic acid); The remainder is deionized water.

2. The laundry detergent according to claim 1, characterized in that, The pH value of the laundry detergent is 6.5-8.

0.

3. The laundry detergent according to claim 1, characterized in that, The poly(N-vinylpyrrolidone- co 1-Methacrylic acid is obtained by dissolving vinylpyrrolidone and methacrylic acid in an organic solvent, adding an initiator, reacting under a nitrogen atmosphere, and then washing and drying.

4. The laundry detergent according to claim 1, characterized in that, The chelating agent is selected from one or more of disodium EDTA, trisodium ethylenediamine disuccinate, sodium citrate, tetrasodium glutamate diacetate, and methylglycine diacetate.

5. The laundry detergent according to claim 1, characterized in that, The anionic surfactant is selected from one or more of alkylbenzene sulfonic acid, 70% ethoxylated sodium sulfate, sodium alkyl sulfonate, sodium alkylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and alkenyl sulfonate.

6. The laundry detergent according to claim 1, characterized in that, The alkalizing agent is selected from one or more of caustic soda flakes, potassium hydroxide, sodium silicate, sodium succinate, sodium carbonate, and sodium bicarbonate.

7. The laundry detergent according to claim 1, characterized in that, The nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ether 9EO, fatty alcohol polyoxyethylene ether 7EO, fatty alcohol polyoxyethylene ether 5EO, fatty alcohol polyoxyethylene ether 3EO, alkyl glycosides, and alkanolamides.

8. The laundry detergent according to claim 1, characterized in that, The antioxidant is selected from sodium metabisulfite and / or butylated hydroxytoluene.

9. The laundry detergent according to claim 1, characterized in that, The preservative is selected from one or more of Kathon, Bropol, DMDM ​​hydantoin and imidazolidinyl urea.

10. The poly(N-vinylpyrrolidone)-containing product according to any one of claims 1-9 co A method for preparing a laundry detergent containing (-methacrylic acid), characterized in that, Includes the following steps: The chelating agent, anionic surfactant, alkalizing agent, and nonionic surfactant were stirred evenly at 80-85°C. After cooling to room temperature, antioxidants and preservatives were added, followed by the addition of poly(N-vinylpyrrolidone). co (-Methacrylic acid) was stirred until homogeneous, the pH was adjusted, and deionized water was added to obtain the product containing poly(N-vinylpyrrolidone-) co Laundry detergent containing methyl methacrylate (MCMA).

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