A fast dissolving block detergent composition and a process for its preparation

Abstract

The present application provides a kind of instant block detergent composition and its preparation method, the instant block detergent composition includes surfactant, binder, disintegrant, washing auxiliary, coated active oxygen bleaching agent, enzyme preparation, remaining auxiliary agent;Wherein, the disintegrant includes modified swelling disintegrant, acid disintegrant and basic disintegrant;The present application introduces hydrophilic group into swelling disintegrant, reduces its crystallinity, so that it can swell and dissolve quickly after contacting water;In addition, the present application cooperates acid disintegrant, basic disintegrant and swelling disintegrant, so that the disintegration time of the present application in water is greatly reduced and the disintegration is more uniform.Simultaneously, the present application uses multilayer isolation technology, and active oxygen bleaching agent, acid disintegrant is isolated in different ways, so as to enhance the storage stability of the present application.Moreover, the enzyme preparation and active oxygen bleaching agent in the present application produce synergistic effect, can make the present application give consideration to the advantages of neutral mildness and strong detergency.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, specifically to a fast-dissolving block detergent composition and its preparation method. Background Technology

[0002] As the laundry industry transforms towards "convenience, efficiency, and multi-functionality," block detergents, with their advantages of precise measurement, low transportation and storage costs, and flexible application scenarios, are gradually becoming common products in household daily cleaning, hotel linen washing, restaurant tableware cleaning, and industrial light-dirt equipment cleaning. However, the requirements for washing efficiency, product stability, and applicability are constantly increasing across various scenarios: household users expect detergents to disintegrate quickly and take effect immediately; hotel linens require batch and efficient washing to avoid slow disintegration that prolongs the washing cycle; and the cleaning of delicate fabrics such as wool and silk requires products that combine strong detergency with gentleness. Against this backdrop, the contradiction between the actual application performance of block detergents and the needs of various scenarios is becoming increasingly prominent, and optimizing their core performance has become a key direction for technological upgrading in the industry.

[0003] The core technology solutions for block detergents in the current industry are designed around three dimensions: "disintegration-cleaning-storage." For the disintegration system, most employ a single effervescent system (such as a sodium bicarbonate-citric acid combination) or a single swelling system (with unmodified swelling agents as the core) to achieve dispersion upon contact with water. For the cleaning formulation, alkaline additives are added in combination with active oxygen bleach to enhance the removal power of stubborn stains. In terms of the production process, disintegrants, cleaning ingredients, and additives are compounded using simple physical mixing methods, simplifying the production process. Furthermore, some products adjust the amount of swelling agent added in an attempt to increase the disintegration speed, but without optimizing its molecular structure.

[0004] However, existing technologies have several shortcomings: First, the disintegration efficiency is difficult to adapt to the needs of rapid washing. The unmodified swelling agent used in traditional single swelling systems has high crystallinity (≥70%) and weak hydrophilicity, with a swelling ratio of only 550 times within 30 minutes, resulting in an overall product disintegration time of up to 25 minutes. Second, the storage stability is poor. Acidic disintegrants, alkaline components, and active oxygen bleaching agents are prone to premature reactions in high humidity environments, leading to problems such as decreased bulk strength, bag swelling, and deactivation of active ingredients. Existing simple mixing processes cannot achieve complete isolation of the above components. Thirdly, there is a significant contradiction between mildness and detergency. To improve detergency, most products are highly alkaline, which can easily irritate the skin and damage delicate fabrics such as wool and silk. In a neutral system, if there is a lack of highly effective active ingredients, the removal rate of stubborn stains such as blood stains and oil stains will be significantly reduced. Fourthly, there is a gap in the technology for modifying swelling agents. Existing technologies have not yet targeted the molecular structure of swelling agents, and it is impossible to reduce their crystallinity by introducing hydrophilic functional groups, which makes it difficult to achieve a breakthrough in improving the water absorption rate and swelling power of swelling agents.

[0005] In conclusion, a new technical solution is urgently needed to address the problems existing in the current technology. Summary of the Invention

[0006] To address the deficiencies and shortcomings of the prior art, this invention provides a fast-dissolving block detergent composition and its preparation method. The fast-dissolving block detergent composition provided by this invention possesses good storage stability while also exhibiting excellent mildness and detergency. Upon contact with water, the fast-dissolving block detergent composition provided by this invention forms a highly expanded porous structure and rapidly disintegrates, completely dissolving within 1 minute.

[0007] One object of the present invention is to provide an instant-dissolving block detergent composition comprising the following components in parts by weight: 5-35 parts of surfactant 0.5-8 parts adhesive 15-60 parts of disintegrant 5-50 parts of detergent 1-25 parts of coated active oxygen bleach Enzyme preparation 0.1-5 parts Other additives: 0.01-1 part; The disintegrant includes modified swelling disintegrant, acidic disintegrant, and alkaline disintegrant; The modified swelling disintegrant is obtained by introducing hydrophilic groups into a swelling disintegrant to reduce its crystallinity; The hydrophilic group is selected from one or more of carboxyl, hydroxyl, and amide groups.

[0008] Specifically, acidic disintegrants, alkaline disintegrants, and swelling disintegrants are used in combination. When acidic and alkaline disintegrants come into contact with water, the carbon dioxide generated promotes the disintegration of the block detergent. When the swelling disintegrant comes into contact with water, its volume increases, generating tension that causes the block detergent to break apart. Through these two different principles, the disintegration of the block detergent in water is accelerated, making it convenient to use.

[0009] Furthermore, the swelling disintegrant is selected from one or more of sodium carboxymethyl cellulose, sodium carboxymethyl starch, microcrystalline cellulose, hydroxypropyl starch, crospovidone, low-substituted hydroxypropyl cellulose, crospovidone ether, konjac glucomannan, crospovidone xanthan gum, and guar gum.

[0010] Furthermore, the acidic disintegrant is selected from one or more of citric acid, tartaric acid, malic acid, fumaric acid, and aminosulfonic acid.

[0011] Furthermore, the alkaline disintegrant is selected from one or more of sodium bicarbonate, sodium carbonate, and potassium carbonate.

[0012] Furthermore, the surfactant is selected from one or more of anionic surfactants and nonionic surfactants.

[0013] Furthermore, the anionic surfactant is selected from one or more of fatty alcohol salts, fatty acid alkyl ester sulfonates, sodium fatty alcohol polyether sulfates, α-alkenyl sulfonates, fatty acid methyl ester sulfonates, and fatty alcohol polyoxyethylene ether sulfates; Furthermore, the nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ethers, C12-C14 alkyl glycosides, fatty alcohol alkoxylates, fatty acid methyl ester ethoxylates, fatty acid ethoxylates, and fatty acid alkylolamides. Furthermore, the adhesive is selected from one or more of starch, gelatin, polyethylene glycol, polyvinylpyrrolidone, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and sodium carboxymethylcellulose.

[0014] Furthermore, the detergent additive is selected from one or more of the following: 4A zeolite, sodium citrate, sodium tripolyphosphate, layered sodium silicate, sodium pyrophosphate, silicate, phosphate, citrate, tartrate, ethylenediaminetetraacetate, methylglycine diacetate, and glutamic acid diacetate.

[0015] Furthermore, the coated active oxygen bleaching agent comprises a PVA coating layer and an active oxygen bleaching agent core; The active oxygen bleaching agent is selected from one or more of perborate, percarbonate, persulfate, and urea peroxide.

[0016] Furthermore, the enzyme preparation is selected from one or more of the following: protease, α-amylase, cellulase, hemicellulase, phospholipase, esterase, lipase, peroxidase, oxidase, pectinase, lyase, mannanase, cutinase, reductase, xylanase, amylopectinase, tannic acidase, pentosanase, maltosan, arabinosease, and β-glucanase.

[0017] Furthermore, the remaining additives are selected from one or more of preservatives, fragrances, and colorants.

[0018] Another object of the present invention is to provide a method for preparing the aforementioned instant soluble block detergent composition, the method comprising the following steps: S1. Preparation of modified swelling disintegrant: S1.1. The swelling disintegrant and sodium hydroxide are mixed, then chloroacetic acid is added, the mixture is heated to react, and purified to obtain modified swelling disintegrant 1; and / or S1.2 Blend the swelling disintegrant and sodium hydroxide, then add phosphorus oxychloride, heat to react, then add N-vinylpyrrolidone, heat to react again, purify to obtain modified swelling disintegrant 2; and / or S1.3. The swelling disintegrant and maleic anhydride are mixed and heated to react. Then epichlorohydrin is added and heated to react again. After purification, the modified swelling disintegrant 3 is obtained.

[0019] Further, in step S1.1, the mass ratio of the swelling disintegrant, sodium hydroxide, and chloroacetic acid is (1-3):1:(3-4).

[0020] Furthermore, in step S1.1, the heating temperature is 60-80℃.

[0021] Further, in step S1.2, the mass ratio of the swelling disintegrant, sodium hydroxide, phosphorus oxychloride, and N-vinylpyrrolidone is 20:10:(1-2):(2-4).

[0022] Furthermore, in step S1.2, the heating temperature is 40-60℃.

[0023] Furthermore, in step S1.2, the reheating temperature is 50-70℃.

[0024] Further, in step S1.3, the mass ratio of the swelling disintegrant, maleic anhydride, and epichlorohydrin is 100:(30-50):(3-5).

[0025] Furthermore, in step S1.3, the heating temperature is 30-50℃.

[0026] Furthermore, in step S1.3, the reheating temperature is 50-70℃.

[0027] Specifically, microcrystalline cellulose molecules contain a large number of hydroxyl groups, but have high crystallinity, making it difficult for water molecules to penetrate, and have a swelling coefficient of only 0.8-1.2. The modified microcrystalline cellulose is modified by carboxylation using an alkaline etherification reaction, introducing carboxyl groups, which, on the one hand, are achieved through COO2... - It forms hydrogen bonds with water molecules, and on the other hand, the electrostatic repulsion of the negative ion groups causes the molecular chains to stretch out, reducing the crystallinity to below 20%, which allows water molecules to penetrate quickly.

[0028] Specifically, modified swelling agents reduce crystallinity by introducing strong hydrophilic groups such as carboxymethyl and hydroxyl groups. In water, the chain segments rapidly expand and absorb water to swell through hydrogen bonding, ion hydration, and electrostatic repulsion, generating physical swelling force that causes the detergent matrix to crack, thereby increasing the swelling ratio and water absorption rate.

[0029] Furthermore, the method for preparing the instant block detergent composition further includes the following steps: S2. Coat the active oxygen bleaching agent with PVA and dry it to obtain the coated active oxygen bleaching agent. S3. The acidic disintegrant is blended with the molten binder and granulated to obtain a mixture; S4. The mixture, the coated active oxygen bleach, and the remaining ingredients are blended together and pressed into blocks to obtain a fast-dissolving block detergent composition.

[0030] Furthermore, in step S3, the particle size of the granulation is 200-1500 μm.

[0031] Furthermore, in step S4, the pressure of the pressing block is 10-20 MPa.

[0032] The present invention has the following beneficial effects: (1) The present invention provides a fast-dissolving block detergent composition, wherein the fast-dissolving block detergent composition includes surfactant, binder, disintegrant, detergent aid, coated active oxygen bleach, enzyme preparation, and other aids; wherein the disintegrant includes modified swelling disintegrant, acidic disintegrant and alkaline disintegrant; the present invention introduces hydrophilic groups into the swelling disintegrant to prepare a modified swelling disintegrant, thereby reducing its crystallinity and enabling it to rapidly absorb water and swell upon contact with water; in addition, the present invention combines acidic disintegrant, alkaline disintegrant and swelling disintegrant for synergistic effect. On the one hand, the swelling disintegrant rapidly expands upon contact with water, generating physical expansion force to cause the detergent matrix to crack, promoting the reaction of acidic disintegrant and alkaline disintegrant; on the other hand, the acidic disintegrant and alkaline disintegrant react rapidly upon contact with water to generate carbon dioxide gas, which can further promote the disintegration rate of the swelling disintegrant, thereby significantly reducing the time for the block detergent of the present invention to completely disintegrate and dissolve in water. In addition, the combination of three modified swelling disintegrants can produce a synergistic effect, which can rapidly build a network framework and water channels inside the block, reduce the risk of gelation blockage, and further promote the rapid disintegration and dispersion of block detergents.

[0033] (2) This invention employs a multi-level isolation technology. The acidic disintegrant is melt-coated and granulated with an adhesive to form an isolation core, which avoids direct contact with alkaline components. At the same time, the active oxygen bleaching agent is coated with polyvinyl alcohol, which reduces its reactivity with surfactants. The synergistic effect of these two isolation methods significantly reduces the reaction rate between acidic components, alkaline components, and active oxygen bleaching agents, thus enabling this invention to maintain good storage stability under high temperature and high humidity conditions.

[0034] (3) The block detergent composition of the present invention achieves a balance between neutral and mild properties and strong detergency. The present invention controls the pH of the system at neutral, which is less irritating to the skin; the enzyme preparation and the active oxygen bleaching agent produce a synergistic effect, and the specific catalysis of the enzyme preparation and the oxidation of active oxygen combine to significantly improve the detergency effect. The detergency effect on substances such as red wine stains and blood stains is far superior to that of traditional neutral detergents. Detailed Implementation

[0035] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0036] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0037] It should be understood that, except in any operational instance or otherwise indicated, the amounts or all figures representing ingredients used, for example, in the specification and claims, should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained according to the invention.

[0038] In the embodiments and test examples of this invention, the following raw materials will be used: Microcrystalline cellulose: swelling disintegrant, MCC-101, purchased from Anhui Shanhe Pharmaceutical Excipients Co., Ltd.

[0039] Sodium carboxymethyl cellulose: a swelling disintegrant, CMC-NaFH9, purchased from Shandong Heda Group Co., Ltd.

[0040] Sodium carboxymethyl starch: a swelling disintegrant, CMS-NaA, purchased from Zhejiang Shengxiao Chemical Co., Ltd.

[0041] Sodium fatty alcohol polyether sulfate: anionic surfactant, AES-70, purchased from Nanjing Gutian Chemical Co., Ltd.

[0042] Fatty acid methyl ester sulfonate: anionic surfactant, MES 87%, purchased from Jiangsu Jiafeng Chemical Co., Ltd.

[0043] Fatty alcohol polyoxyethylene ether: nonionic surfactant, AEO9, purchased from Liaoning Aoke Chemical Co., Ltd.

[0044] Fatty acid alkylolamide: nonionic surfactant, 6501, purchased from Guangzhou Jiadi Chemical Co., Ltd.

[0045] 4A zeolite: Detergent additive, 4A-01, purchased from Daqian Purification Materials Co., Ltd., Gongyi City, Henan Province.

[0046] Polyethylene glycol: adhesive, PEG-6000, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0047] Polyvinylpyrrolidone: Adhesive, PVPK30, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0048] Protease: Enzyme preparation, Protex 6L, purchased from Novozymes (China) Investment Co., Ltd.

[0049] Amylase: Enzyme preparation, Termoyl 120L, purchased from Novozymes (China) Investment Co., Ltd.

[0050] Lipase: Enzyme preparation, Lipex 100L, purchased from Novozymes (China) Investment Co., Ltd.

[0051] Mannanase: an enzyme preparation, Manaway 4L, purchased from Novozymes (China) Investment Co., Ltd.

[0052] Fragrance: Detergent fragrance - fresh floral scent, purchased from Guangzhou Fragrance and Flavor Factory Co., Ltd.

[0053] Pigment: Food-grade lemon yellow (E102), purchased from Shanghai Caichen Biotechnology Co., Ltd.

[0054] PVA: PVA-0588, purchased from Zhejiang Hisun Biomaterials Co., Ltd.

[0055] Red wine stained cloth: CS3, purchased from CFT.

[0056] Bloodstained cloth: EMPA112, purchased from CFT.

[0057] Tea-stained cloth: BC1, purchased from CFT.

[0058] Charcoal black and olive oil stained cloth: EMPA104, purchased from CFT.

[0059] Spinach-stained cloth: CS25, purchased from CFT.

[0060] Hydrochloric acid: 37 wt%, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0061] Unless otherwise specified, the water used in the embodiments of this invention refers to deionized water.

[0062] In the embodiments of this invention, "parts" refers to parts by mass.

[0063] The components and their corresponding mass fractions of the instant-dissolving block detergent compositions in Examples 1-3 are shown in Table 1.

[0064] Table 1. Composition ratios of the fast-dissolving block detergent compositions in Examples 1-3 The preparation method of the fast-dissolving block detergent compositions in Examples 1-3 includes the following steps: S1.1 10 g of microcrystalline cellulose was dispersed in 100 mL of 5 wt% sodium hydroxide aqueous solution and activated for 1 h; 17.5 g of chloroacetic acid was added and reacted at 70 °C for 3 h. After the reaction was completed, the pH was neutralized to neutral with hydrochloric acid, filtered and washed with 80 wt% ethanol aqueous solution, and vacuum dried at 60 °C for 4 h to obtain modified microcrystalline cellulose with a carboxymethyl substitution degree of 0.8. S1.2 Add 10 g of sodium carboxymethyl cellulose to 50 g of 10 wt% sodium hydroxide aqueous solution, stir and activate for 30 min, then add 0.8 g of phosphorus oxychloride, heat to 50℃ and react for 1.5 h. After the reaction is completed, add 1.5 g of N-vinylpyrrolidone, and graft at 60℃ for 2 h. After the reaction is completed, neutralize the pH to neutral with hydrochloric acid, wash and dry to obtain modified cross-linked sodium carboxymethyl cellulose with a carboxymethyl substitution degree of 0.8 and a cross-linking degree of 20%. S1.3. 10 g of sodium carboxymethyl starch and 4 g of maleic anhydride were mixed and added to 50 mL of water. The mixture was heated to 40 °C and reacted for 2 h. After the reaction was completed, 0.4 g of epichlorohydrin was added and the mixture was heated to 60 °C and reacted for 1.5 h. Finally, the mixture was cooled, filtered and dried to obtain modified sodium carboxymethyl starch with a degree of carboxymethyl substitution of 0.7. S2. In a coating machine, sodium percarbonate is coated with a saturated aqueous solution of PVA. After drying, a coated active oxygen bleach is obtained, wherein PVA accounts for 1% of the weight of the coated active oxygen bleach. S3. According to the above mass proportions, the molten binder and nonionic surfactant are blended together, citric acid is added, and the mixture is stirred evenly. The mixture is then granulated using a granulator to obtain a particle size of 500-1100 μm to obtain the mixture. S4. The mixture, the coated active oxygen bleach, and the remaining ingredients are blended according to the above-mentioned mass proportions and pressed into blocks by a briquetting machine at a pressure of 15 MPa to obtain a fast-dissolving block detergent composition.

[0065] Comparative Example 1 A fast-dissolving block detergent composition. The difference between this comparative example and Example 3 is that step S1.2 is omitted, and the modified cross-linked carboxymethyl cellulose sodium is replaced with cross-linked carboxymethyl cellulose sodium by mass, while the other components and amounts remain unchanged.

[0066] Comparative Example 2 A fast-dissolving block detergent composition. The difference between this comparative example and Example 3 is that step S2 is omitted, and the encapsulated active oxygen bleach in step S4 is replaced by sodium percarbonate, while the remaining components and amounts remain unchanged.

[0067] Comparative Example 3 A fast-dissolving block detergent composition, the difference between this comparative example and Example 3 is that step S3 is omitted, and S4 is replaced by: S4. The coated active oxygen bleach is mixed with the remaining ingredients according to the above mass proportions, and the mixture is pressed into blocks by a briquetting machine at a pressure of 15 MPa to obtain a fast-dissolving block detergent composition. The remaining ingredients and dosages remain unchanged.

[0068] Test Example 1 pH tests were performed on the instant-dissolving block detergent compositions prepared in Examples 1-3.

[0069] The test method refers to GB / T6368-2008 "Determination of pH value of aqueous solutions of surfactants - Potentiometric method".

[0070] The test results are shown in Table 2.

[0071] Table 2 pH test results As can be seen from Table 2, the pH values ​​of the quick-dissolving block detergent compositions prepared in Examples 1-3 are all close to neutral, which can effectively solve the problem of traditional detergents' strong alkalinity irritating the skin and damaging fabrics.

[0072] Test Example 2 Stability tests were conducted on the instant block detergent compositions of Examples 1-3 and Comparative Examples 1-3.

[0073] The quick-dissolving block detergent compositions prepared in Examples 1-3 and Comparative Examples 1-3 were packaged in sealed bags and placed in an incubator at a constant temperature of 40°C and a constant humidity of 70%. The appearance of the samples was observed at intervals of 2 weeks and 4 weeks. At 4 weeks, the activity retention rate of the active oxygen bleaching agent of each sample was tested. Visual inspection: If there is precipitation on the surface of the block, or if the block is loose or its color changes, it is recorded as unqualified; otherwise, it is qualified. Retention rate of active oxygen bleaching agent: determined by iodometric method. The hydrogen peroxide released when the active oxygen bleaching agent dissolves in water reacts with potassium iodide to generate elemental iodine, which is then titrated with sodium thiosulfate standard solution. The percentage of the residual active substance to the initial amount is calculated. The test results are shown in Table 3.

[0074] Table 3 Stability Test Results As shown in Table 3, Examples 1-3, due to the combination of acidic disintegrant coating granulation and coated active oxygen bleach, exhibited high active oxygen retention rates after 4 weeks of storage, with no surface precipitation, loose lumps, or changes in lumpy appearance or color. This demonstrates that multi-level isolation technology can effectively address the poor stability issues of traditional products. Comparative Example 2, which did not coat the active oxygen bleach, and Comparative Example 3, which did not coat the acidic disintegrant, resulted in premature reaction of the active ingredients and a significant decrease in storage stability.

[0075] Test Example 3 The detergency performance of the instant block detergent compositions of Examples 1-3 and Comparative Examples 1-3 was tested.

[0076] Refer to GB / T13174-2008 "Determination of detergency and recycle performance of detergents for clothing"; Red wine stained cloths, blood stained cloths, tea stained cloths, charcoal black olive oil stained cloths, and spinach stained cloths were washed at 20℃ and 30℃ respectively to simulate low temperature and normal temperature scenarios. Hard water with a hardness of 250 ppm was used for washing, the detergent concentration was 2.0 g / L, the washing time was 20 min, and the washing equipment was uniformly an RQHL vertical stain remover with a speed of 60 rpm. The cloths were rinsed 3 times according to GB / T13174-2008 standard. After completion, the cloths were dehydrated and air-dried at room temperature.

[0077] Stain removal value characterization: The whiteness value of the soiled cloth before washing (R0) and after washing (R1) was tested using a WSB3 whiteness meter (457 nm wavelength, conforming to JB / T9327 and JJG512 standards). The stain removal effect is represented by △R=R1-R0. The larger the △R, the stronger the stain removal ability.

[0078] The test results are shown in Tables 4 and 5.

[0079] Table 4. Results of stain removal performance test at room temperature Table 5. Low-temperature detergency test results As shown in Table 4, at room temperature, Examples 1-3 exhibit excellent cleaning effects on red wine stains, blood stains, and charcoal and olive oil stains. This is because the enzyme preparation and active oxygen bleach of the present invention work synergistically, achieving powerful stain removal even in a neutral system. Table 5 shows that, in low-temperature scenarios, although the ΔR of Examples 1-3 is lower than that at room temperature, they still possess good cleaning performance. This is because the coated active oxygen bleach can still be slowly released at low temperatures, effectively solving the problem of low activity of traditional active oxygen at low temperatures. In contrast, Comparative Example 2 did not coat the active oxygen bleach, causing it to react prematurely and become ineffective, resulting in reduced cleaning performance. Comparative Example 3 did not coat the acidic disintegrant, causing the acidic components to react prematurely with the active oxygen bleach, thus affecting the stain removal effect.

[0080] Test Example 4 The disintegration properties of the instant block detergent compositions prepared in Examples 1-3 and Comparative Example 1 were tested.

[0081] Take 5 g of each sample and press them into a uniform size of 30 mm in diameter. Set the test environment to 25℃ and 1L of distilled water, without stirring or additional mechanical force, to simulate a static washing scenario and test the complete disintegration time. Each sample was tested 3 times and the average value was taken as the final result.

[0082] Complete disintegration time: The time from when the sample is placed in water until no visible lumps remain.

[0083] The test results are shown in Table 6.

[0084] Table 6 Disintegration performance test results As shown in Table 6, the instant block detergent compositions prepared in Examples 1-3 exhibit excellent disintegration efficiency, rapidly disintegrating and releasing the active ingredients in water during use. In Comparative Example 1, because the modified cross-linked carboxymethyl cellulose sodium was replaced with cross-linked carboxymethyl cellulose sodium, the higher crystallinity of the cross-linked carboxymethyl cellulose sodium resulted in greater difficulty for water molecules to penetrate, leading to a lower disintegration rate compared to Example 3.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fast-dissolving, block-shaped detergent composition, characterized in that, The instant block detergent composition comprises the following components in parts by weight: 5-35 parts of surfactant 0.5-8 parts adhesive 15-60 parts of disintegrant 5-50 parts of detergent 1-25 parts of coated active oxygen bleach Enzyme preparation 0.1-5 parts Other additives: 0.01-1 part; The disintegrant includes modified swelling disintegrant, acidic disintegrant, and alkaline disintegrant; The modified swelling disintegrant is obtained by introducing hydrophilic groups into a swelling disintegrant; The hydrophilic group is selected from one or more of carboxyl, hydroxyl, and amide groups.

2. The instant block detergent composition according to claim 1, characterized in that, The swelling disintegrant is selected from one or more of sodium carboxymethyl cellulose, sodium carboxymethyl starch, microcrystalline cellulose, hydroxypropyl starch, crospovidone, low-substituted hydroxypropyl cellulose, crospovidone ether, konjac glucomannan, crospovidone xanthan gum, and guar gum.

3. The instant block detergent composition according to claim 1, characterized in that, The acidic disintegrant is selected from one or more of citric acid, tartaric acid, malic acid, fumaric acid, and aminosulfonic acid.

4. The instant block detergent composition according to claim 1, characterized in that, The alkaline disintegrant is selected from one or more of sodium bicarbonate, sodium carbonate, and potassium carbonate.

5. The instant block detergent composition according to claim 1, characterized in that, The coated active oxygen bleaching agent comprises a PVA coating layer and an active oxygen bleaching agent core; The active oxygen bleaching agent is selected from one or more of perborate, percarbonate, persulfate, and urea peroxide.

6. A method for preparing the instant block detergent composition according to any one of claims 1-5, characterized in that, The preparation method of the instant block detergent composition includes the following steps: S1. Preparation of modified swelling disintegrant: S1.

1. The swelling disintegrant and sodium hydroxide are mixed, then chloroacetic acid is added, the mixture is heated to react, and purified to obtain modified swelling disintegrant 1; and / or S1.2 Blend the swelling disintegrant and sodium hydroxide, then add phosphorus oxychloride, heat to react, then add N-vinylpyrrolidone, heat to react again, purify to obtain modified swelling disintegrant 2; and / or S1.

3. The swelling disintegrant and maleic anhydride are mixed and heated to react. Then epichlorohydrin is added and heated to react again. After purification, the modified swelling disintegrant 3 is obtained.

7. The method for preparing the instant block detergent composition according to claim 6, characterized in that, In step S1.1, the mass ratio of the swelling disintegrant, sodium hydroxide, and chloroacetic acid is (1-3):1:(3-4).

8. The method for preparing the instant block detergent composition according to claim 6, characterized in that, In step S1.2, the mass ratio of the swelling disintegrant, sodium hydroxide, phosphorus oxychloride, and N-vinylpyrrolidone is 20:10:(1-2):(2-4).

9. The method for preparing the instant block detergent composition according to claim 6, characterized in that, In step S1.3, the mass ratio of the swelling disintegrant, maleic anhydride, and epichlorohydrin is 100:(30-50):(3-5).

10. The method for preparing the instant block detergent composition according to claim 6, characterized in that, It also includes the following steps: S2. Coat the active oxygen bleaching agent with PVA and dry it to obtain the coated active oxygen bleaching agent. S3. The acidic disintegrant is blended with the molten binder and granulated to obtain a mixture; S4. The mixture, the coated active oxygen bleach, and the remaining ingredients are blended together and pressed into blocks to obtain a fast-dissolving block detergent composition.

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