Antibacterial concentrated laundry detergent and preparation method thereof

Abstract

The invention discloses an antibacterial concentrated laundry detergent and a preparation method thereof, and relates to the technical field of daily chemicals. The fatty alcohol-polyoxyethylene ether, the acrylic acid and the organic silicone oil are mixed and copolymerized to prepare the modified fatty alcohol-polyoxyethylene ether, so that the thickening effect is achieved, and the skin is not easily damaged; then fatty alcohol polyoxyethylene ether sodium sulfate is compounded with the surfactant, so that the advantages of the two surfactants are considered; secondly, chitosan and sodium alginate are compounded and embedded with curcumin and citral to prepare antibacterial microcapsules; the citral destroys the integrity and permeability of bacterial cell membranes, so that the antibacterial effect is achieved, and the washed clothes have aftertaste; curcumin is used as an antioxidant to further guarantee the antibacterial property of the clothes; the two herbal effective factors are embedded in microcapsules, do not react with an alkaline surfactant during storage, and can be combined with the surfactant at the second half stage of clothes washing to reduce damage and residues caused by the surfactant. The laundry detergent prepared by the invention has the effects of resisting bacteria and not hurting hands.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical products, in particular to an antibacterial concentrated laundry detergent and a preparation method thereof. Background Art

[0002] With the improvement of living standards and the strengthening of environmental awareness, concentrated detergents have received widespread attention, which also meets the transformation needs of enterprises in the situation of increasing resource and energy consumption and rising raw material costs. Laundry detergent is a common daily necessity in daily life, and the concentration of ordinary laundry detergent is 15-20%. With the improvement of living standards, consumers' awareness of energy conservation and environmental protection has gradually increased, and their requirements for laundry detergent have gradually increased. Therefore, it has become a trend to develop concentrated laundry detergent that can save packaging costs, transportation costs, and reduce plastic bottle pollution.

[0003] Most types of concentrated laundry detergents on the market now have active substance content that is about twice that of ordinary laundry detergents. Although the concentration has increased, the product is still a relatively thin liquid, which does not give consumers the feeling of a concentrated product. Therefore, most consumers still use the same amount of ordinary laundry detergent due to usage habits, without deliberately reducing the amount, resulting in a lot of waste and not achieving true environmental protection. In addition, people's antibacterial awareness is also constantly increasing. Antibacterial laundry detergent can inhibit the proliferation of bacteria on clothing, protect clothing, and reduce the harm that bacterial proliferation may cause to the human body. Summary of the invention

[0004] The object of the present invention is to provide an antibacterial concentrated laundry detergent and a preparation method thereof, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an antibacterial concentrated laundry detergent, which is prepared by using a composite surfactant of fatty alcohol polyoxyethylene ether sodium sulfate and modified fatty alcohol polyoxyethylene ether as main cleaning factors and adding homemade antibacterial microcapsules.

[0006] Furthermore, the modified fatty alcohol polyoxyethylene ether is prepared by copolymerizing fatty alcohol polyoxyethylene ether, acrylic acid and silicone oil.

[0007] Furthermore, the self-made antibacterial microcapsules are prepared by compounding chitosan and sodium alginate to embed curcumin and citral.

[0008] Furthermore, a method for preparing an antibacterial concentrated laundry detergent comprises the following preparation steps:

[0009] (1) Add 20 parts of fatty alcohol polyoxyethylene ether and 1-5 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 100-120° C. for azeotropic dehydration for 1 hour, then add 10-20 parts of acrylic acid, 5-15 parts of vinyltrimethoxysilane, 0.5-2.5 parts of p-toluenesulfonic acid as a catalyst, and 0.6-1.2 parts of hydroquinone as an inhibitor in sequence, reflux for esterification reaction, and terminate the reaction when the amount of water at the bottom of the oil / water separator is constant, then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085 MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether;

[0010] (2) Sodium alginate was dissolved in deionized water, placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution was stirred for 30 minutes until it was uniformly dissolved in sodium alginate aqueous solution; curcumin and citral were added to the sodium alginate solution, and the weight ratio of curcumin, citral and sodium alginate solution was 3:3:0.2-0.4, the speed was increased to 1000 rpm, the temperature was kept constant, and the mixture was stirred for 30 minutes until the mixture was uniformly dissolved to obtain a sodium alginate mixed solution; chitosan powder was dissolved in deionized water, placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C, and the solution was stirred for 30 minutes until the mixture was uniformly dissolved to obtain a chitosan aqueous solution; calcium chloride was added to the chitosan solution using a rubber-tipped dropper. aqueous solution, the mass ratio of chitosan solution to calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until it is evenly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution drop by drop using a syringe with a needle aperture of 0.280 mm, and the needle outlet of the syringe is 2 cm away from the liquid surface. After the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, stirred at a speed of 500 rpm at room temperature for 20 minutes, allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules;

[0011] (3) Mix water, modified fatty alcohol polyoxyethylene ether, sodium fatty alcohol polyoxyethylene ether sulfate, cocamide diethanolamine and ginger essential oil and stir at 200 rpm for 30 min to make them uniform, add antibacterial microcapsules, and stir at 200 rpm until the mixture is uniform and free of lumps, thereby preparing an antibacterial concentrated laundry detergent.

[0012] Furthermore, the reflux temperature in step (1) is 70-90°C.

[0013] Furthermore, in the step (2), the mass ratio of sodium alginate to deionized water in the sodium alginate aqueous solution is 1:20-30.

[0014] Furthermore, in the step (2), the mass ratio of chitosan to deionized water in the chitosan aqueous solution is 1:30-40.

[0015] Furthermore, the weight concentration of the calcium chloride aqueous solution in step (2) is 1%.

[0016] Furthermore, in the step (3), the mass ratio of water, modified fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sodium sulfate, cocamide diethanolamine and ginger essential oil is 10-20:40-60:30-80:20-32:3-15.

[0017] Furthermore, in step (3), the antibacterial microcapsules account for 0.3-2.5% of the mass of the laundry detergent.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The present invention uses fatty alcohol polyoxyethylene ether sodium sulfate and modified fatty alcohol polyoxyethylene ether compound surfactant as the main cleaning factor, and adds self-made antibacterial microcapsules to achieve the effect of antibacterial and harmless to hands.

[0020] Firstly, fatty alcohol polyoxyethylene ether, acrylic acid and silicone oil are mixed and copolymerized to prepare modified fatty alcohol polyoxyethylene ether. The modified fatty alcohol polyoxyethylene ether can achieve the thickening effect and make the laundry detergent less likely to damage the skin during use. The silicone oil makes it less likely for the fatty alcohol polyoxyethylene ether to remain on the surface of clothes. Then, a surfactant composed of fatty alcohol polyoxyethylene ether sodium sulfate and modified fatty alcohol polyoxyethylene ether is used as the main cleaning factor, taking into account the advantages of the two surfactants.

[0021] Secondly, the compounded surfactant still has a certain alkalinity due to the presence of sodium sulfate of fatty alcohol polyoxyethylene ether, thereby affecting the storage of other effective factors; the present invention prepares antibacterial microcapsules by compounding chitosan and sodium alginate to embed curcumin and citral; citral can destroy the integrity and permeability of bacterial cell membranes, thereby causing cytoplasm loss, thereby achieving an antibacterial effect; citral also has aromaticity, so that washed clothes have a lingering fragrance; curcumin, as an antioxidant, is attached to the surface of washed clothes in small amounts, both during the process and in the subsequent period to further ensure the antibacterial property of the clothes; these two herbal effective factors are embedded in the microcapsules, released to act on the clothes during the washing process, avoiding reaction with alkaline surfactants during storage, and can combine with surfactants in the second half of the washing process to reduce the damage and residue caused by the active agent. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of an antibacterial concentrated laundry detergent prepared in the following examples are as follows:

[0024] Antibacterial property: The antibacterial rate of Escherichia coli, Staphylococcus aureus and Candida albicans was tested according to the test standard QB / T 2850-2007.

[0025] Mildness: Place the hands of 30 volunteers without allergies in laundry detergent for 20 minutes and observe the changes.

[0026] Example 1

[0027] (1) Add 20 parts of fatty alcohol polyoxyethylene ether and 1 part of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 100° C. for azeotropic dehydration for 1 hour, then add 10 parts of acrylic acid, 5 parts of vinyltrimethoxysilane, 0.5 parts of p-toluenesulfonic acid as a catalyst, and 0.6 parts of hydroquinone as an inhibitor in sequence, reflux for esterification reaction, the reflux temperature is 70° C., and the reaction is terminated when the amount of water at the bottom of the oil / water separator is constant, then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085 MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether;

[0028] (2) Sodium alginate was dissolved in deionized water at a mass ratio of 1:20, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution was stirred for 30 minutes until it was uniformly mixed into a sodium alginate aqueous solution; curcumin and citral were placed in the sodium alginate solution at a weight ratio of 3:3:0.2 to curcumin, citral and sodium alginate solution, and the speed was increased to 1000 rpm, the temperature was kept constant, and the mixture was stirred for 30 minutes until the mixture was uniformly mixed to obtain a sodium alginate mixed solution; chitosan powder was dissolved in deionized water at a mass ratio of 1:30 to chitosan, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C, and the solution was stirred for 30 minutes until the mixture was uniformly mixed to obtain a chitosan aqueous solution; a dropper was used to pour the chitosan powder into the solution. A 1% calcium chloride aqueous solution is added dropwise to the chitosan solution, the mass ratio of the chitosan solution to the calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution dropwise using a syringe with a needle aperture of 0.280 mm, the needle outlet of the syringe is 2 cm away from the liquid surface, after the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, the mixture is stirred at a speed of 500 rpm at room temperature for 20 minutes, the mixture is allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules;

[0029] (3) Water, modified fatty alcohol polyoxyethylene ether, sodium fatty alcohol polyoxyethylene ether sulfate, cocamide diethanolamine and ginger essential oil were mixed in a mass ratio of 10:40:30:20:3, stirred at 200 rpm for 30 min, antibacterial microcapsules were added, the antibacterial microcapsules accounted for 0.3% of the mass of the laundry detergent, and stirred at 200 rpm until uniform without lumps, to prepare an antibacterial concentrated laundry detergent.

[0030] Example 2

[0031] (1) Add 20 parts of fatty alcohol polyoxyethylene ether and 3 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 110° C. for azeotropic dehydration for 1 hour, then add 15 parts of acrylic acid, 10 parts of vinyltrimethoxysilane, 1.5 parts of catalyst p-toluenesulfonic acid, and 1.4 parts of inhibitor hydroquinone in sequence, reflux for esterification reaction, the reflux temperature is 80° C., and the reaction is terminated when the amount of water at the bottom of the oil / water separator is constant, then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085 MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether;

[0032] (2) Sodium alginate was dissolved in deionized water at a mass ratio of 1:25, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution was stirred for 30 minutes until it was uniformly mixed into a sodium alginate aqueous solution; curcumin and citral were placed in the sodium alginate solution at a weight ratio of 3:3:0.3 to curcumin, citral and sodium alginate solution, and the speed was increased to 1000 rpm, the temperature was kept constant, and the mixture was stirred for 30 minutes until it was uniformly mixed to obtain a sodium alginate mixed solution; chitosan powder was dissolved in deionized water at a mass ratio of 1:35 to chitosan, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C, and the solution was stirred for 30 minutes until it was uniformly mixed to obtain a chitosan aqueous solution; a dropper was used to pour the chitosan powder into the solution. A 1% calcium chloride aqueous solution is added dropwise to the chitosan solution, the mass ratio of the chitosan solution to the calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution dropwise using a syringe with a needle aperture of 0.280 mm, the needle outlet of the syringe is 2 cm away from the liquid surface, after the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, the mixture is stirred at a speed of 500 rpm at room temperature for 20 minutes, the mixture is allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules;

[0033] (3) Water, modified fatty alcohol polyoxyethylene ether, sodium fatty alcohol polyoxyethylene ether sulfate, cocamide diethanolamine and ginger essential oil were mixed in a mass ratio of 15:50:55:26:9, stirred at 200 rpm for 30 min, antibacterial microcapsules were added, the antibacterial microcapsules accounted for 1.4% of the mass of the laundry detergent, and stirred at 200 rpm until uniform without lumps, to prepare an antibacterial concentrated laundry detergent.

[0034] Example 3

[0035] (1) Add 20 parts of fatty alcohol polyoxyethylene ether and 5 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 120° C. for azeotropic dehydration for 1 hour, then add 20 parts of acrylic acid, 15 parts of vinyltrimethoxysilane, 2.5 parts of catalyst p-toluenesulfonic acid, and 1.2 parts of inhibitor hydroquinone in sequence, reflux for esterification reaction, the reflux temperature is 90° C., and the reaction is terminated when the amount of water at the bottom of the oil / water separator is constant, then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085 MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether;

[0036] (2) Sodium alginate was dissolved in deionized water at a mass ratio of 1:30, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution was stirred for 30 minutes until it was uniformly mixed into a sodium alginate aqueous solution; curcumin and citral were placed in the sodium alginate solution at a weight ratio of 3:3:0.4 to curcumin, citral and sodium alginate solution, and the speed was increased to 1000 rpm, the temperature was kept constant, and the mixture was stirred for 30 minutes until the mixture was uniformly mixed to obtain a sodium alginate mixed solution; chitosan powder was dissolved in deionized water at a mass ratio of 1:40 to chitosan, and the solution was placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C, and the solution was stirred for 30 minutes until the mixture was uniformly mixed to obtain a chitosan aqueous solution; a dropper was used to pour the chitosan powder into the solution. A 1% calcium chloride aqueous solution is added dropwise to the chitosan solution, the mass ratio of the chitosan solution to the calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution dropwise using a syringe with a needle aperture of 0.280 mm, the needle outlet of the syringe is 2 cm away from the liquid surface, after the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, the mixture is stirred at a speed of 500 rpm at room temperature for 20 minutes, the mixture is allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules;

[0037] (3) Water, modified fatty alcohol polyoxyethylene ether, sodium fatty alcohol polyoxyethylene ether sulfate, cocamide diethanolamine and ginger essential oil were mixed in a mass ratio of 20:60:80:32:15, stirred at 200 rpm for 30 min, antibacterial microcapsules were added, the antibacterial microcapsules accounted for 2.5% of the mass of the laundry detergent, and stirred at 200 rpm until uniform without lumps, to prepare an antibacterial concentrated laundry detergent.

[0038] Comparative Example 1

[0039] The difference between Comparative Example 1 and Example 2 is that step (1) is different. Step (1) is changed to: add 20 parts of fatty alcohol polyoxyethylene ether and 3 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 110°C for azeotropic dehydration for 1 hour, then add 10 parts of vinyltrimethoxysilane, 1.5 parts of catalyst p-toluenesulfonic acid, and 1.4 parts of inhibitor hydroquinone in sequence, reflux for esterification reaction, the reflux temperature is 80°C, and the reaction is terminated when the water amount at the bottom of the oil / water separator is constant, and then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether; the remaining steps are the same as Example 2.

[0040] Comparative Example 2

[0041] The difference between Comparative Example 2 and Example 2 is that step (1) is different. Step (1) is changed to: add 20 parts of fatty alcohol polyoxyethylene ether and 3 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 110°C for azeotropic dehydration for 1 hour, then add 15 parts of acrylic acid, 1.5 parts of catalyst p-toluenesulfonic acid, and 1.4 parts of inhibitor hydroquinone in sequence, reflux for esterification reaction, the reflux temperature is 80°C, and the reaction is terminated when the water amount at the bottom of the oil / water separator is constant, and then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether; the remaining steps are the same as Example 2.

[0042] Comparative Example 3

[0043] The difference between Comparative Example 3 and Example 2 is that there is no step (2), and step (3) is changed to: water, modified fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sodium sulfate, cocamide diethanolamine, ginger essential oil, curcumin and citral are mixed in a mass ratio of 15:50:55:26:9:3:3, stirred at 200 rpm for 30 min, antibacterial microcapsules are added, the antibacterial microcapsules account for 1.4% of the mass of the laundry detergent, and stirred at 200 rpm until uniform and free of lumps, to obtain an antibacterial concentrated laundry detergent; the remaining steps are the same as those in Example 2.

[0044] Comparative Example 4

[0045] The difference between Comparative Example 4 and Example 2 is that step (2) is different, and step (2) is changed to: sodium alginate is taken and dissolved in deionized water, the mass ratio of sodium alginate to deionized water is 1:25, and the solution is placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution is stirred for 30 minutes until it is uniformly a sodium alginate aqueous solution; curcumin and citral are put into the sodium alginate solution, the weight ratio of curcumin to the sodium alginate solution is 3:0.3, the speed is increased to 1000 rpm, the temperature is kept constant, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a sodium alginate mixed solution; chitosan powder is taken and dissolved in deionized water, the mass ratio of chitosan to deionized water is 1:35, and the mixture is placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C for stirring, and the solution is stirred for 30 minutes until it is uniform, to obtain a chitosan aqueous solution; A 1% calcium chloride aqueous solution is added dropwise into the chitosan solution using a rubber-tipped dropper, the mass ratio of the chitosan solution to the calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution dropwise using a syringe with a needle aperture of 0.280 mm, the needle outlet of the syringe is 2 cm away from the liquid surface, after the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, the mixture is stirred at a speed of 500 rpm at room temperature for 20 minutes, the mixture is allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules; the remaining steps are the same as those in Example 2.

[0046] Comparative Example 5

[0047] The difference between Comparative Example 5 and Example 2 is that step (2) is different, and step (2) is changed to: sodium alginate is taken and dissolved in deionized water, the mass ratio of sodium alginate to deionized water is 1:25, and the solution is placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution is stirred for 30 minutes until it is uniformly alginate aqueous solution; curcumin and citral are placed in the sodium alginate solution, the weight ratio of citral to sodium alginate solution is 3:0.3, the speed is increased to 1000 rpm, the temperature is kept constant, and the mixture is stirred for 30 minutes until the mixture is uniform, thereby obtaining a sodium alginate mixed solution; chitosan powder is taken and dissolved in deionized water, the mass ratio of chitosan to deionized water is 1:35, and the mixture is placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C for stirring, and the solution is stirred for 30 minutes until it is uniform, thereby obtaining a chitosan aqueous solution; A 1% calcium chloride aqueous solution is added dropwise into the chitosan solution using a rubber-tipped dropper, the mass ratio of the chitosan solution to the calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until the mixture is uniformly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution dropwise using a syringe with a needle aperture of 0.280 mm, the needle outlet of the syringe is 2 cm away from the liquid surface, after the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, the mixture is stirred at a speed of 500 rpm at room temperature for 20 minutes, the mixture is allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules; the remaining steps are the same as those in Example 2.

[0048] Effect example

[0049] Table 1 below shows the performance analysis results of an antibacterial concentrated laundry detergent using Examples 1 to 3 of the present invention and Comparative Examples 1 to 5.

[0050] Table 1

[0051]

[0052] From the comparison of the experimental data of mildness of the embodiment and the comparative example, it can be found that the present invention prepares modified fatty alcohol polyoxyethylene ether by mixing and copolymerizing fatty alcohol polyoxyethylene ether, acrylic acid and silicone oil. The modified fatty alcohol polyoxyethylene ether can not only achieve the thickening effect, but also make the laundry detergent less likely to damage the skin during use. The silicone oil makes the fatty alcohol polyoxyethylene ether less likely to remain on the surface of clothes. Then, the fatty alcohol polyoxyethylene ether sodium sulfate and the modified fatty alcohol polyoxyethylene ether are compounded as the main cleaning factor, taking into account the advantages of the two surfactants. From the comparison of the experimental data of the antibacterial properties of the embodiment and the comparative example, it can be found that the present invention prepares antibacterial microcapsules by embedding curcumin and citral through the compound of chitosan and sodium alginate; citral can destroy the integrity and permeability of bacterial cell membranes, thereby causing cytoplasm loss, thereby achieving the antibacterial effect; citral also has aromaticity, so that the washed clothes have a lingering fragrance; curcumin, as an antioxidant, is attached to the surface of the washed clothes in small amounts, both during the process and subsequently to further ensure the antibacterial properties of the clothes; these two effective factors are embedded in the microcapsules, released to act on the clothes during the washing process, avoiding reaction with alkaline surfactants during storage, and can combine with surfactants in the second half of the washing process to reduce the damage and residue caused by the active agent.

[0053] It will be apparent to those skilled in the art that the 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 features 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, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An antibacterial concentrated laundry detergent, characterized in that: The laundry detergent is prepared by using fatty alcohol polyoxyethylene ether sodium sulfate and modified fatty alcohol polyoxyethylene ether compound surfactant as main cleaning factors and adding self-made antibacterial microcapsules.

2. The antibacterial concentrated laundry detergent according to claim 1, characterized in that: The modified fatty alcohol polyoxyethylene ether is prepared by copolymerizing fatty alcohol polyoxyethylene ether, acrylic acid and silicone oil.

3. The antibacterial concentrated laundry detergent according to claim 1, characterized in that: The self-made antibacterial microcapsules are prepared by compounding chitosan and sodium alginate to embed curcumin and citral.

4. A method for preparing an antibacterial concentrated laundry detergent, characterized in that: The method comprises the following preparation steps: (1) Add 20 parts of fatty alcohol polyoxyethylene ether and 1-5 parts of benzene to a flask equipped with a stirrer, a thermometer, an oil / water separator and a condenser, heat to 100-120° C. for azeotropic dehydration for 1 hour, then add 10-20 parts of acrylic acid, 5-15 parts of vinyltrimethoxysilane, 0.5-2.5 parts of p-toluenesulfonic acid as a catalyst, and 0.6-1.2 parts of hydroquinone as an inhibitor in sequence, reflux for esterification reaction, and terminate the reaction when the amount of water at the bottom of the oil / water separator is constant, then use a weakly basic anion exchange resin to purify the reaction solution, and then reduce the pressure to 0.085 MPa to distill and remove benzene to obtain modified fatty alcohol polyoxyethylene ether; (2) Sodium alginate was dissolved in deionized water, placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 60°C, and the solution was stirred for 30 minutes until it was uniformly dissolved in sodium alginate aqueous solution; curcumin and citral were added to the sodium alginate solution, and the weight ratio of curcumin, citral and sodium alginate solution was 3:3:0.2-0.4, the speed was increased to 1000 rpm, the temperature was kept constant, and the mixture was stirred for 30 minutes until the mixture was uniformly dissolved to obtain a sodium alginate mixed solution; chitosan powder was dissolved in deionized water, placed in a magnetic stirrer at a speed of 800 rpm and a temperature of 40°C, and the solution was stirred for 30 minutes until the mixture was uniformly dissolved to obtain a chitosan aqueous solution; calcium chloride was added to the chitosan solution using a rubber-tipped dropper. aqueous solution, the mass ratio of chitosan solution to calcium chloride aqueous solution is 1:0.5, the speed of the magnetic stirrer is 800 rpm, the temperature is 40°C, and the mixture is stirred for 30 minutes until it is evenly mixed to obtain a chitosan mixed solution; at 40°C, the sodium alginate mixed solution is dripped into the chitosan mixed solution drop by drop using a syringe with a needle aperture of 0.280 mm, and the needle outlet of the syringe is 2 cm away from the liquid surface. After the dropwise addition is completed, the stirring speed is reduced to 3000 rpm, the temperature is kept unchanged, and the mixture is stirred for 60 minutes; then 3 times the volume of deionized water is added, stirred at a speed of 500 rpm at room temperature for 20 minutes, allowed to stand at room temperature for 2 hours, filtered with filter paper, and dried in an oven at 50°C for 12 hours to obtain antibacterial microcapsules; (3) Mix water, modified fatty alcohol polyoxyethylene ether, sodium fatty alcohol polyoxyethylene ether sulfate, cocamide diethanolamine and ginger essential oil and stir at 200 rpm for 30 min to make them uniform, add antibacterial microcapsules, and stir at 200 rpm until the mixture is uniform and free of lumps, thereby preparing an antibacterial concentrated laundry detergent.

5. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: The reflux temperature in step (1) is 70-90°C.

6. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: In the step (2), the mass ratio of sodium alginate to deionized water in the sodium alginate aqueous solution is 1:20-30.

7. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: In the step (2), the mass ratio of chitosan to deionized water in the chitosan aqueous solution is 1:30-40.

8. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: The weight concentration of the calcium chloride aqueous solution in step (2) is 1%.

9. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: In the step (3), the mass ratio of water, modified fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sodium sulfate, cocamide diethanolamine and ginger essential oil is 10-20:40-60:30-80:20-32:3-15.

10. The method for preparing an antibacterial concentrated laundry detergent according to claim 4, characterized in that: In the step (3), the antibacterial microcapsules account for 0.3-2.5% of the mass of the laundry detergent.

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