A color-protection and color-anti-bleeding compound additive, a preparation method and application thereof

Abstract

This application relates to the field of laundry detergent processing technology, specifically disclosing a color-protecting and color-preserving compound additive, its preparation method, and its application. The color-protecting and color-preserving compound additive is mainly composed of the following raw materials in parts by weight: 10-20 parts polyvinylpyrrolidone, 15-25 parts modified starch, 3-5 parts dihydrazine adipic acid, 15-25 parts sodium carbonate, 6-10 parts sodium carboxymethyl cellulose, 8-12 parts zeolite 4A, 8-12 parts sodium sulfate, and 11-15 parts water. The modified starch is obtained by first grafting starch with 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohexane-5-en-2-ol, and then polymerizing it with diacetone acrylamide. This color-protecting and color-preserving compound additive, with the addition of polyvinylpyrrolidone to the raw materials, synergistic effects with the modified starch, and cross-linking with dihydrazine adipic acid, exhibits high color-protecting and color-preserving effects, maintaining the original color of clothing, extending the service life of clothing, and meeting market demand.

Description

Technical Field

[0001] This application relates to the field of laundry detergent processing technology, and more specifically, it relates to a color-protecting and color-preserving compound additive, its preparation method, and its application. Background Technology

[0002] With the development of the times, people's clothing has become increasingly fashionable and diverse, with a wide variety of colors. However, when washing clothes, mixing multiple colors often leads to fading or even color bleeding. In such cases, people often wash white, light-colored, dark-colored, and black clothes separately to reduce fading and color bleeding during washing. This inevitably requires separate washing, which not only increases washing time but also consumes more water and electricity.

[0003] To save washing time for clothes of different colors and reduce fading and color bleeding during washing, some researchers have added polyvinylpyrrolidone (PVP) to laundry detergent. While PPV can inhibit dye migration and protect the dye on the surface of clothes, achieving a color-protecting effect, the color-protecting effect is limited. The lowest color difference value ΔE for color protection is 1.46, and the lowest color difference value ΔE for preventing color bleeding is 4.13, which cannot meet higher requirements. Summary of the Invention

[0004] To improve the color-protecting and color-preserving effects of laundry detergent, this application provides a color-protecting and color-preserving compound additive, its preparation method, and its application.

[0005] In a first aspect, this application provides a color-blocking and color-protecting compound additive, which adopts the following technical solution:

[0006] A color-protecting and color-preserving compound additive is mainly made from the following raw materials in parts by weight: 10-20 parts of polyvinylpyrrolidone, 15-25 parts of modified starch, 3-5 parts of dihydrazine adipic acid, 15-25 parts of sodium carbonate, 6-10 parts of sodium carboxymethyl cellulose, 8-12 parts of 4A zeolite, 8-12 parts of sodium sulfate, and 11-15 parts of water.

[0007] The modified starch is obtained by first grafting starch with 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohex-5-en-2-ol, and then polymerizing it with diacetone acrylamide.

[0008] The laundry detergent prepared using the color-protecting and color-preserving compound additive of this application exhibits a color difference value ΔE < 1 and a color difference value ΔE < 2 after one wash, demonstrating that the color-protecting and color-preserving compound additive has a high color-protecting and color-preserving effect, maintaining the original color of clothing, extending the service life of clothing, and meeting market demand.

[0009] Polyvinylpyrrolidone (PVP), a nonionic surfactant, is added to the raw materials. It forms a protective film on the surface of clothing, reducing dye loss and providing color fixation and preventing color bleeding. Modified starch is also added. The modified starch is grafted with 3-chloro-2-hydroxypropyltrimethylammonium chloride, exhibiting weak cationicity due to the grafted cationic groups. Furthermore, it is grafted with 1-chlorohexane-5-en-2-ol, and through polymerization with diacetone acrylamide, nonionic groups are grafted onto the starch surface, resulting in nonionicity. The modified starch of this application, through the interaction of cationic and nonionic groups, adsorbs onto the surface of clothing and complexes with the dye to form an insoluble lake. Simultaneously, it forms a protective film on the clothing surface, reducing dye loss. Moreover, the modified starch is weakly cationic, and its effectiveness is largely unaffected by electrolytes and anionic surfactants. Meanwhile, polyvinylpyrrolidone and modified starch are added to the anti-color bleeding and color protection compound additive, and the synergistic effect between the two is utilized to form an interwoven protective film and increase the density of the protective film, effectively inhibiting dye migration, reducing dye damage to the surface of clothing, and enhancing the anti-color bleeding and color protection effect.

[0010] Furthermore, the color-protecting and color-preserving compound additive of this application also contains dihydrazine adipic acid. Dihydrazine adipic acid has good penetrability and can penetrate deep into the interior of clothing. Moreover, dihydrazine adipic acid contains hydrazide groups, and the diacetone acrylamide on the surface of modified starch contains ketone carbonyl groups. The hydrazide groups and ketone carbonyl groups can undergo a cross-linking reaction, thereby causing dihydrazine adipic acid and modified starch to cross-link, enhancing the bonding strength between the protective film and the clothing, and increasing the color-protecting and color-preserving effect after multiple washes.

[0011] Optionally, the modified starch is prepared using the following method:

[0012] S1. Add isopropanol to water and mix. Heat to 40-60℃, add starch and mix. Then add sodium hydroxide solution and stir for 50-70 minutes. After that, add 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohex-5-en-2-ol and stir for 21-23 hours. Adjust the pH to 6-7, cool, filter, and wash to obtain the semi-finished product.

[0013] S2. Add the semi-finished product obtained in step S1 to water and mix. Adjust the pH value to 3-4, heat to 40-60℃, and then add the initiator and diacetone acrylamide under inert gas protection. Stir for 3-5 hours, adjust the pH value to 6-7, cool, filter, wash, and dry to constant weight to obtain modified starch.

[0014] Optionally, the weight ratio of starch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-chlorohex-5-en-2-ol, and diacetone acrylamide is 100:(2-4):(1-3):(1-3).

[0015] By adopting the above technical solution, starch is first gelatinized using sodium hydroxide, and then 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohexane-5-en-2-ol are grafted onto the starch surface. Subsequently, under the initiator, 1-chlorohexane-5-en-2-ol and diacetone acrylamide on the starch surface undergo a polymerization reaction. The starch is gelatinized, grafted, and polymerized in steps. By utilizing the synergy between gelatinization, grafting, and polymerization, the grafting rate is increased, and the preparation of modified starch is simple and stable.

[0016] Optionally, the weight ratio of starch to sodium hydroxide solution is 10:(8-13), and the mass concentration of sodium hydroxide solution is 5-10%.

[0017] By adopting the above technical solution, the amount and mass concentration of sodium hydroxide solution are optimized, further optimizing the amount of sodium hydroxide added. Sodium hydroxide is used to break some hydrogen bonds in starch, weaken the intermolecular forces, thereby destroying the core structure and allowing starch to fully gelatinize. This facilitates the grafting of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohexane-5-en-2-ol into starch. When the amount of sodium hydroxide added is selected within the above range, starch can be well gelatinized, and the preparation of modified starch is stable and easy to control.

[0018] Optionally, the initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate, and the weight ratio of starch to initiator is 100:(1-5).

[0019] By adopting the above technical solutions, ammonium persulfate, sodium persulfate, and potassium persulfate can not only initiate the polymerization reaction of monomers, but also provide abundant and inexpensive raw materials. Furthermore, the amount of initiator added is optimized to reduce the risk of insufficient initiator addition leading to incomplete monomer reaction, and to reduce the risk of waste due to excessive initiator addition. When the amount of initiator added is within the above range, it can ensure stable polymerization of monomers, facilitating the preparation of modified starch.

[0020] Furthermore, in step S1, the weight ratio of starch, water, and isopropanol is 10:(8-12):(35-45). Preferably, the weight ratio of starch, water, and isopropanol is 1:1:4.

[0021] In step S2, the weight ratio of starch to water is 1:(4-6). Preferably, the weight ratio of starch to water is 1:5.

[0022] Optionally, the starch is one or more of corn starch, wheat starch, and tapioca starch.

[0023] By adopting the above technical solution, the source of starch is optimized, making starch selection easier. Furthermore, the desired results can be achieved when selecting starch from corn starch, wheat starch, and tapioca starch.

[0024] Secondly, this application provides a method for preparing the anti-color bleeding and color-protecting compound additive as described above, using the following technical solution:

[0025] A method for preparing a color-protecting and color-preserving compound additive as described above includes the following steps: under continuous stirring, polyvinylpyrrolidone, modified starch, dihydrazine adipic acid, sodium carbonate, sodium carboxymethyl cellulose, 4A zeolite, and sodium sulfate are mixed, then sprayed with water, granulated, and dried to constant weight to obtain the color-protecting and color-preserving compound additive.

[0026] By adopting the above technical solution, it is convenient to prepare compound additives for preventing color bleeding and protecting color.

[0027] Thirdly, this application provides an application of the color-protecting and color-preserving compound additive as described above, employing the following technical solution:

[0028] An application of a color-protecting compound additive as described above, wherein the color-protecting compound additive is used in the preparation of laundry detergent, and the amount of the color-protecting compound additive is 5-10 wt% of the total amount of laundry detergent.

[0029] By adopting the above technical solution, the anti-color bleeding and color-protecting compound additive is applied to laundry detergent, giving it excellent anti-color bleeding and color-protecting effects. During washing, it reduces damage to the dyes in the clothes, maintains the original color of the garments, and extends their lifespan.

[0030] Optionally, the laundry detergent is mainly made of the following raw materials in weight percentages: 7-9% anionic surfactant, 13-17% nonionic surfactant, 3.5-6.5% water softener, 0.5-1.5% plant fragrance, 9-11% polyvinyl alcohol, 6-10% color-protecting and color-preserving compound additives, 15-25% alkaline additives, 8-12% 4A zeolite, 8-12% sodium sulfate, and 11-15% water.

[0031] By adopting the above technical solution, the raw materials and proportions of laundry detergent are optimized, making the preparation of laundry detergent easier.

[0032] In one embodiment, the laundry detergent is mainly made from the following raw materials in weight percentages: 8% anionic surfactant, 15% nonionic surfactant, 5% water softener, 1% plant fragrance, 10% polyvinyl alcohol, 8% anti-color bleeding and color-protecting compound additive, 20% alkaline additive, 10% 4A zeolite, 10% sodium sulfate, and 13% water.

[0033] It can also be designed with the following raw material ratios by weight as needed: 7% anionic surfactant, 17% nonionic surfactant, 3.5% water softener, 1.5% plant fragrance, 9% polyvinyl alcohol, 6% anti-color bleeding and color protection compound additive, 25% alkaline additive, 8% 4A zeolite, 12% sodium sulfate, and 11% water.

[0034] It can also be designed with the following weight percentages of raw materials for laundry detergent as needed: 9% anionic surfactant, 13% nonionic surfactant, 6.5% water softener, 0.5% plant fragrance, 11% polyvinyl alcohol, 10% anti-color bleeding and color protection compound additive, 15% alkaline additive, 12% 4A zeolite, 8% sodium sulfate, and 15% water.

[0035] Specifically, the raw materials and proportions of the laundry detergent are within the above-mentioned range, and all can achieve the expected results.

[0036] Optionally, the anionic surfactant is either sodium alkylbenzene sulfonate or sodium fatty acid methyl ester sulfonate, and the weight ratio of sodium alkylbenzene sulfonate to sodium fatty acid methyl ester sulfonate is (3-5):(1-3).

[0037] The nonionic surfactant is one of three types: fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and lauric acid diethanolamide, and the weight ratio of fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and lauric acid diethanolamide is (3-5):(1-3):(1-3); the water softener is one or more of sodium citrate, disodium ethylenediaminetetraacetate, and tetrasodium glutamate diacetate.

[0038] The alkaline additive is one or more of sodium carbonate, sodium bicarbonate, and sodium silicate.

[0039] By adopting the above technical solutions, it is easier to select anionic surfactants, nonionic surfactants, water softeners, and alkaline additives, and it is also easier to process and prepare laundry detergent. Furthermore, it increases the detergency of laundry detergent and improves its applicability.

[0040] In summary, this application has at least the following beneficial effects: The color-protecting and color-preserving compound additive of this application adds modified starch to the raw materials. The modified starch is obtained by first grafting starch with 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohexane-5-en-2-ol, and then polymerizing it with diacetone acrylamide. This makes the starch surface rich in cationic and nonionic groups, and exhibits weak cationic and nonionic properties. Combined with the synergistic effect of polyvinylpyrrolidone and the cross-linking of dihydrazine adipic acid, a dense and stable protective film is formed on the surface of clothing. After one wash with laundry detergent, the color difference value ΔE for color protection is <1, and the color difference value ΔE for preventing color bleeding is <2, demonstrating a high color-protecting and color-preserving effect, maintaining the original color of clothing, extending the service life of clothing, and meeting market demand. Detailed Implementation

[0041] To make this application easier to understand, the following detailed description will be provided with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained commercially or by conventional methods.

[0042] Preparation Example

[0043] Preparation Example 1

[0044] A modified starch, prepared by the following method:

[0045] S1. Add 400g of isopropanol to 100g of water and stir for 10 minutes. Heat to 50℃, add 100g of starch, and stir for 30 minutes. Then add 100g of sodium hydroxide solution (8% concentration) and stir for 60 minutes. Next, add 3g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 2g of 1-chlorohex-5-en-2-ol, and stir for 22 hours. Adjust the pH to 6.5 using 8% hydrochloric acid solution, cool to 25℃, filter, and then wash three times with 200g of 80% ethanol solution each time to obtain the semi-finished product.

[0046] The starch used is corn starch, and it is selected from Shandong Pingju Biotechnology Co., Ltd.

[0047] S2. Add the semi-finished product obtained in step S1 to 500g of water and stir for 30min. Then adjust the pH to 3.5 using an 8% hydrochloric acid solution. Heat to 50℃, then purge the reaction system with nitrogen to replace the air and create a nitrogen protection atmosphere. Add 3g of ammonium persulfate initiator and 2g of diacetone acrylamide, and stir for 4h. Then adjust the pH to 6.5 using an 8% sodium hydroxide solution, cool to 25℃, filter, and wash three times with an 80% ethanol solution (200g each time). Finally, dry at 50℃ to constant weight to obtain modified starch.

[0048] Preparation Example 2

[0049] A modified starch, prepared by the following method:

[0050] S1. Add 400g of isopropanol to 100g of water and stir for 10 minutes. Heat to 40℃, add 100g of starch, and stir for 30 minutes. Then add 80g of sodium hydroxide solution (10% concentration) and stir for 50 minutes. Next, add 2g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 3g of 1-chlorohex-5-en-2-ol, and stir for 23 hours. Adjust the pH to 7 using 8% hydrochloric acid solution, cool to 25℃, filter, and then wash three times with 200g of 80% ethanol solution each time to obtain the semi-finished product.

[0051] The starch used is corn starch, and it is selected from Shandong Pingju Biotechnology Co., Ltd.

[0052] S2. Add the semi-finished product obtained in step S1 to 500g of water and stir for 30min. Then adjust the pH to 4 using an 8% hydrochloric acid solution. Heat to 40℃, then purge the reaction system with nitrogen to replace the air and create a nitrogen protection atmosphere. Add 5g of ammonium persulfate initiator and 3g of diacetone acrylamide, and stir for 5h. Then adjust the pH to 7 using an 8% sodium hydroxide solution, cool to 25℃, filter, and wash three times with an 80% ethanol solution (200g each time). Finally, dry to constant weight at 50℃ to obtain modified starch.

[0053] Preparation Example 3

[0054] A modified starch, prepared by the following method:

[0055] S1. Add 400g of isopropanol to 100g of water and stir for 10 minutes. Heat to 60℃, add 100g of starch, and stir for 30 minutes. Then add 130g of sodium hydroxide solution (5% concentration) and stir for 70 minutes. Next, add 4g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1g of 1-chlorohex-5-en-2-ol, and stir for 22 hours. Adjust the pH to 6 using 8% hydrochloric acid solution, cool to 25℃, filter, and then wash three times with 200g of 80% ethanol solution each time to obtain the semi-finished product.

[0056] The starch used is corn starch, and it is selected from Shandong Pingju Biotechnology Co., Ltd.

[0057] S2. Add the semi-finished product obtained in step S1 to 500g of water and stir for 30min. Then adjust the pH to 3 using an 8% hydrochloric acid solution. Heat to 60℃, then purge the reaction system with nitrogen to replace the air and create a nitrogen protection atmosphere. Add 1g of ammonium persulfate initiator and 1g of diacetone acrylamide, and stir for 3h. Then adjust the pH to 6 using an 8% sodium hydroxide solution, cool to 25℃, filter, and wash three times with an 80% ethanol solution, using 200g of ethanol solution each time. Then dry at 50℃ to constant weight to obtain modified starch.

[0058] Example

[0059] Table 1. Content of each raw material in the color-protecting and color-blocking compound additive (unit: g)

[0060] Example Example 1 Example 2 Example 3 Polyvinylpyrrolidone 15 10 20 Modified starch 20 25 15 adihydrazine 4 3 5 Sodium carbonate 20 25 15 Sodium carboxymethyl cellulose 8 6 10 4A zeolite 10 8 12 Sodium sulfate 10 12 8 water 13 11 15

[0061] Example 1

[0062] A compound additive for preventing color bleeding and protecting color, the proportions of its raw materials are shown in Table 1.

[0063] Among them, polyvinylpyrrolidone is polyvinylpyrrolidone K30; 4A zeolite is selected from Hebei Huipeng New Material Technology Co., Ltd.; modified starch is obtained by first grafting starch with 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohex-5-en-2-ol, and then polymerizing it with diacetone acrylamide, and the modified starch is prepared using Preparation Example 1.

[0064] A method for preparing a color-protecting and color-preserving compound additive includes the following steps:

[0065] Polyvinylpyrrolidone, modified starch, dihydrazine adipic acid, sodium carboxymethyl cellulose, 4A zeolite, and sodium sulfate were added to sodium carbonate at a rotation speed of 100 r / min and stirred for 30 min. Then, water was sprayed on the mixture, and granulation was carried out. The water spraying was completed within 60 min. Afterward, the mixture was dried at 50℃ to constant weight to obtain a color-protecting and color-preserving compound additive.

[0066] Example 2-3

[0067] A color-protecting and color-preserving compound additive is different from that in Example 1 in that the raw material ratio of the color-protecting and color-preserving compound additive is different, and the raw material ratio is shown in Table 1.

[0068] Example 4

[0069] A color-protecting and color-preserving compound additive differs from Example 1 in that the modified starch in the raw materials of the color-protecting and color-preserving compound additive comes from a different source, and the modified starch is prepared using Preparation Example 2.

[0070] Example 5

[0071] A color-protecting and color-preserving compound additive differs from Example 1 in that the modified starch in the raw materials of the color-protecting and color-preserving compound additive comes from a different source, and the modified starch is prepared using Preparation Example 3.

[0072] Comparative Example

[0073] Comparative Example 1

[0074] A color-protecting and color-preserving compound additive, which differs from Example 1 in that the modified starch is replaced with an equal amount of polyvinylpyrrolidone in the raw materials of the color-protecting and color-preserving compound additive.

[0075] Comparative Example 2

[0076] A color-protecting and color-preserving compound additive, which differs from Example 1 in that, in the raw materials of the color-protecting and color-preserving compound additive, an equal amount of modified starch is used to replace polyvinylpyrrolidone.

[0077] Comparative Example 3

[0078] A color-protecting and color-preserving compound additive, which differs from Example 1 in that the modified starch is replaced with an equal amount of starch in the raw materials of the color-protecting and color-preserving compound additive.

[0079] Comparative Example 4

[0080] A color-protecting and color-preserving compound additive, which differs from Example 1 in that, in the raw materials of the color-protecting and color-preserving compound additive, an equal amount of sodium carbonate is used to replace dihydrazine adipic acid.

[0081] Application examples

[0082] Application Example 1

[0083] A laundry detergent is made from the following raw materials: 8g of anionic surfactant, 15g of nonionic surfactant, 5g of water softener, 1g of plant fragrance, 10g of polyvinyl alcohol, 8g of color-protecting and color-preserving compound additive, 20g of alkaline additive, 10g of 4A zeolite, 10g of sodium sulfate, and 13g of water.

[0084] The anionic surfactants are sodium alkylbenzene sulfonate and sodium fatty acid methyl ester sulfonate, and the weight ratio of sodium alkylbenzene sulfonate to sodium fatty acid methyl ester sulfonate is 2:1. Specifically, the sodium alkylbenzene sulfonate is sodium dodecylbenzene sulfonate, and the sodium fatty acid methyl ester sulfonate is selected from Guangzhou Taili Chemical Co., Ltd.

[0085] The nonionic surfactants are three types: fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and lauric acid diethanolamide, and the weight ratio of fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and lauric acid diethanolamide is 2:1:1. Specifically, the fatty alcohol polyoxyethylene ether is AEO-20 and the octylphenol polyoxyethylene ether is OP-20.

[0086] The water softener is sodium citrate; the plant fragrance is lavender fragrance, selected from Shaanxi Chenming Biotechnology Co., Ltd.; the polyvinyl alcohol is polyvinyl alcohol 2488; the alkaline additive is sodium carbonate; 4A zeolite is selected from Hebei Huipeng New Material Technology Co., Ltd.; the anti-color bleeding and color protection compound additive was prepared according to Example 1.

[0087] A method for preparing laundry detergent includes the following steps:

[0088] Anionic surfactant, nonionic surfactant, water softener, plant fragrance, polyvinyl alcohol, anti-color bleeding and color-protecting compound additive, 4A zeolite, and sodium sulfate were added to the alkaline additive at a speed of 100 r / min and stirred for 60 min. Then, water was sprayed on and granulated. The water spraying was completed within 60 min. Afterward, the mixture was dried at 50℃ to constant weight to obtain laundry detergent.

[0089] Application Example 2-5

[0090] A laundry detergent differs from Application Example 1 in that the anti-color bleeding and color protection compound additives in the raw materials of the laundry detergent come from different sources, and the anti-color bleeding and color protection compound additives in Application Examples 2-5 are prepared in accordance with Examples 2-5 respectively.

[0091] Comparative Application Examples

[0092] Compare and contrast examples 1-4

[0093] A laundry detergent differs from Application Example 1 in that the anti-color bleeding and color protection compound additives in the raw materials of the laundry detergent are from different sources, and the anti-color bleeding and color protection compound additives in Comparative Application Examples 1-4 are prepared sequentially using Comparative Examples 1-4 respectively.

[0094] Performance testing

[0095] The laundry detergents obtained in Application Examples 1-5 and Comparative Application Examples 1-4 were used as samples, and the following performance tests were performed on the samples. The test results are shown in Table 2.

[0096] The color-protecting effect was assessed using the following method: At a temperature of 30℃ and a rotation speed of 120 rpm, 5g of laundry detergent was added to 1000g of water, followed by 10 pieces of black cotton fabric (6cm x 6cm). The mixture was stirred for 30 minutes, then removed, dried, and the wash cycle was completed. A colorimeter was then used to measure the color values ​​before and after washing, and the color difference value ΔE was calculated. The color difference value ΔE = |color value before washing - color value after washing|. A smaller color difference value ΔE indicates less fading of the black cotton fabric and a better color-protecting effect.

[0097] The anti-color bleeding effect was achieved using the following method: At a temperature of 30℃ and a rotation speed of 120 rpm, 5g of laundry detergent and 0.5g of Direct Black 19 dye were added to 1000g of water. Ten pieces of white cotton fabric (6cm x 6cm) were then added and washed for 30 minutes. The fabric was then removed, dried, and one wash cycle was completed. A colorimeter was then used to measure the color values ​​before and after washing, and the color difference value ΔE was calculated. The color difference value ΔE = |color value before washing - color value after washing|. A smaller color difference value ΔE indicates less noticeable color bleeding on the white cotton fabric and a better anti-color bleeding effect.

[0098] Table 2 Detection Results

[0099]

[0100] As shown in Table 2, the laundry detergent prepared using the color-protecting and color-preserving compound additives of this application exhibits high color-protecting and color-preserving effects after one wash, with a color difference value ΔE of 0.55-0.83 and a color difference value ΔE of 0.98-1.51. After 10 washes, the color difference value ΔE of 0.72-1.11 and the color difference value ΔE of 1.32-2.05 remain excellent after multiple washes, maintaining the original color of clothing, extending the service life of clothing, and meeting market demands.

[0101] Application Example 1 is compared with Comparative Application Examples 1-2. Comparative Application Example 1 added polyvinylpyrrolidone to the raw materials of the anti-color bleeding and color-protecting compound additive; Comparative Application Example 2 added modified starch to the raw materials of the anti-color bleeding and color-protecting compound additive; Application Example 1 added both polyvinylpyrrolidone and modified starch to the raw materials of the anti-color bleeding and color-protecting compound additive. This shows that when polyvinylpyrrolidone and modified starch are added simultaneously to the raw materials, the synergistic effect between the two further reduces the color difference value ΔE for color protection and the color difference value ΔE for anti-color bleeding, exhibiting a higher anti-color bleeding and color-protecting effect.

[0102] Application Example 1 was compared with Comparative Application Example 4. In Application Example 1, compared to Comparative Application Example 4, dihydrazine adipic acid was added to the raw materials of the anti-color bleeding and color-protecting compound additive. It can be seen that adding dihydrazine adipic acid to the raw materials resulted in the same color protection difference ΔE after one wash and the same color difference ΔE for preventing color bleeding as in Comparative Application Example 4. However, it significantly reduced the color protection difference ΔE and the color difference ΔE for preventing color bleeding after 10 washes. This may be because dihydrazine adipic acid undergoes a cross-linking reaction with the modified starch, increasing the bonding strength between the protective film and the clothing, thereby enhancing the anti-color bleeding and color-protecting effect after multiple washes.

[0103] It should be noted that the embodiments described above are only for explaining this application and do not constitute any limitation on this application. This application has been described with reference to typical embodiments, but it should be understood that the terms used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to this application within the scope of the claims, and revisions can be made to the invention without departing from the scope and spirit of this application. Although the application described herein relates to specific methods, materials, and embodiments, it does not mean that this application is limited to the specific examples disclosed herein; on the contrary, this application can be extended to all other methods and applications with the same function.

Claims

1. A compound additive for preventing color bleeding and protecting color, characterized in that: It is mainly made from the following raw materials in parts by weight: 10-20 parts of polyvinylpyrrolidone, 15-25 parts of modified starch, 3-5 parts of dihydrazine adipic acid, 15-25 parts of sodium carbonate, 6-10 parts of sodium carboxymethyl cellulose, 8-12 parts of 4A zeolite, 8-12 parts of sodium sulfate, and 11-15 parts of water. The modified starch is prepared by the following method: S1. Isopropanol is added to water and mixed, the temperature is raised to 40-60℃, starch is added and mixed, then sodium hydroxide solution is added, and the mixture is stirred for 50-70 min. Then 3-chloro-2-hydroxypropyltrimethylammonium chloride and 1-chlorohexane-5-en-2-ol are added, and the mixture is stirred for 21-23 h. The pH is adjusted to 6-7, the mixture is cooled, filtered, and washed to obtain a semi-finished product. S2. The semi-finished product obtained in step S1 is added to water and mixed, the pH is adjusted to 3-4, the temperature is raised to 40-60℃, and then, under inert gas protection, an initiator and diacetone acrylamide are added, and the mixture is stirred for 3-5 h. The pH is adjusted to 6-7, the mixture is cooled, filtered, washed, and dried to constant weight to obtain the modified starch. The weight ratio of starch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-chlorohex-5-en-2-ol, and diacetone acrylamide is 100:(2-4):(1-3):(1-3).

2. The color-protecting and color-preserving compound additive according to claim 1, characterized in that: The weight ratio of starch to sodium hydroxide solution is 10:(8-13), and the mass concentration of sodium hydroxide solution is 5-10%.

3. The color-protecting and color-preserving compound additive according to claim 1, characterized in that: The initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate, and the weight ratio of starch to initiator is 100:(1-5).

4. The color-protecting and color-preserving compound additive according to claim 1, characterized in that: The starch is one or more of corn starch, wheat starch, and cassava starch.

5. A method for preparing a color-protecting and color-preserving compound additive as described in any one of claims 1-4, characterized in that: The process includes the following steps: under constant stirring, polyvinylpyrrolidone, modified starch, dihydrazine adipic acid, sodium carbonate, sodium carboxymethyl cellulose, 4A zeolite, and sodium sulfate are mixed, then sprayed with water, granulated, and dried to constant weight to obtain a color-protecting and color-preserving compound additive.

6. The application of a color-protecting and color-preserving compound additive as described in any one of claims 1-4, characterized in that: The color-protecting and color-preserving compound additive is used in the preparation of laundry detergent, and the amount of the color-protecting and color-preserving compound additive accounts for 5-10 wt% of the total amount of laundry detergent.

7. The application of the color-protecting and color-preserving compound additive according to claim 6, characterized in that: The laundry detergent is mainly made of the following raw materials in weight percentages: 7-9% anionic surfactant, 13-17% nonionic surfactant, 3.5-6.5% water softener, 0.5-1.5% plant fragrance, 9-11% polyvinyl alcohol, 6-10% color-protecting and color-preserving compound additives, 15-25% alkaline additives, 8-12% 4A zeolite, 8-12% sodium sulfate, and 11-15% water.

8. The application of the color-protecting and color-preserving compound additive according to claim 7, characterized in that: The anionic surfactant is either sodium alkylbenzene sulfonate or sodium fatty acid methyl ester sulfonate, and the weight ratio of sodium alkylbenzene sulfonate to sodium fatty acid methyl ester sulfonate is (3-5):(1-3); the nonionic surfactant is either fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, or laurate diethanolamide, and the weight ratio of fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, or laurate diethanolamide is (3-5):(1-3):(1-3); the water softener is one or more of sodium citrate, disodium ethylenediaminetetraacetate, and tetrasodium glutamate diacetate; the alkaline additive is one or more of sodium carbonate, sodium bicarbonate, and sodium silicate.

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