Clothing conditioner with softening, fragrance retaining and color protecting effects

Abstract

The invention discloses a clothing conditioner with softening, fragrance retaining and color protecting effects, and relates to the technical field of clothing conditioners, the clothing conditioner comprises, by weight, 80-90% of sodium chloride, 1-6% of WE28 softening component, 2-8% of baking soda, 2-8% of diatomite, 0.2-5% of essence, 0.05-5% of microcapsule, and 0.006-0.1% of pigment; wherein the microcapsule is prepared by compounding modified nano silicon dioxide, a modified chitosan solution and an alginic acid acyl octylamine solution, and the volume ratio of the modified nano silicon dioxide to the modified chitosan solution to the alginic acid acyl octylamine solution is 1: 2: 3-3: 2: 1. According to the invention, the surface of the clothing fiber can be filled with the modified nano silicon dioxide, so that the surface of the fiber is smoother, and the friction between the fibers is reduced; alginyl octylamine has certain lubricity and can form a layer of lubricating film on the surface of the fiber. Some groups on a molecular chain of the modified chitosan can interact with groups on the surfaces of the fibers to increase the flexibility of the fibers, and the WE28 softening component is a special softener and can reduce the static friction coefficient between the fibers.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric conditioners, and specifically to a fabric conditioner with softening, fragrance retention and color protection effects. Background Art

[0002] Referring to a Chinese patent "A Fabric Conditioner and Its Preparation Method" (Publication No.: CN106046337A), it includes a high molecular weight aqueous polyester; the raw materials of the high molecular weight aqueous polyester include: purified terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, a third monomer, and polyethylene glycol; while ensuring a good detergency effect, the residue amount of this fabric conditioner on clothes after multiple washes is still much less than that of existing washing products, and this fabric conditioner is an effective anti-redeposition agent, which can prevent substances such as inorganic substances and particles from depositing on the surface of clothing fibers, reduce the fixation of inorganic substances, particles and other substances on the surface of clothing fibers, thereby effectively maintaining the elasticity of clothing fibers and avoiding the problem of clothes becoming hard. After using this fabric conditioner, the clothes have good softness and are not easy to deform or become hard. Especially when worn close to the body, it has a good sense of comfort, does not irritate the skin, and effectively extends the service life of clothes. However, the antibacterial effect, fragrance retention and color protection effect of the fabric conditioner prepared by the above-mentioned existing technology all need to be improved; for this reason, the present invention proposes a fabric conditioner with softening, fragrance retention and color protection effects to solve the problems mentioned above. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the present invention provides a fabric conditioner with softening, fragrance retention and color protection effects, and solves the problems mentioned in the above background art.

[0005] (2) Technical Solutions

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: A fabric conditioner with softening, fragrance retention and color protection effects, calculated by weight percentage, includes: 80 - 90% of sodium chloride, 1 - 6% of WE28 softening component, 2 - 8% of baking soda, 2 - 8% of diatomite, 0.2 - 5% of essence, 0.05 - 5% of microcapsules, 0.006 - 0.1% of pigment;

[0007] Among them, the microcapsules are compounded from modified nano-silica, modified chitosan solution and octanoyl alginate solution, and their volume ratio is 1:2:3 - 3:2:1.

[0008] Preferably, the preparation method of the modified nano-silica: completely mix a silane precursor and a silane coupling agent containing an epoxy group, then sequentially add cetyltrimethylammonium bromide, deionized water and absolute ethanol, mix evenly, heat up to 30 - 40 °C, stir at a speed of 1100 - 1300 r / min for 30 - 40 min, then perform ultrasonic treatment for 20 - 30 min, then dropwise add ammonia water, continue to stir at a speed of 500 - 700 r / min at this temperature for 6 - 8 h, after the reaction is completed, filter, wash thoroughly with absolute ethanol and deionized water, and finally place in a freeze dryer at a temperature of -58 - -55 °C for 24 h to obtain the modified nano-silica.

[0009] Preferably, the preparation of the alginic acid octanamide:

[0010] (1) Pour sodium alginate into deionized water, stir until it is completely dissolved, then adjust the pH value of the system with a hydrochloric acid solution with a concentration of 0.4 mol / L, and then dilute with deionized water to obtain Solution 1;

[0011] (2) Pour carbodiimide hydrochloride into deionized water, stir until it is completely dissolved to obtain Solution 2;

[0012] (3) Pour Solution 2 into Solution 1, stir, and then slowly dropwise add n-octylamine, continue to stir and react after heating in a water bath;

[0013] (4) After the reaction is completed, add absolute ethanol and then perform suction filtration, wash the product with absolute ethanol 3 - 5 times, then place it in a vacuum drying oven at 50 - 60 °C for 24 h, then take it out and place it in deionized water, wait until it is completely dissolved, then perform dialysis treatment in pure water for 3 - 5 days, and change the water every 3 - 5 h.

[0014] Preferably, in the step (1), adjust the pH value of the system to 3.2 - 3.4, and dilute the concentration of the system until it is 2 - 2.5 wt%.

[0015] Preferably, in the step (3), first stir at a speed of 400 - 600 r / min for 10 - 15 min; after heating the water bath to 40 - 50 °C, stir at a speed of 500 - 800 r / min for 22 - 25 h.

[0016] Preferably, the preparation method of the modified chitosan:

[0017] 1) Under constant temperature conditions, pour chitosan into a sodium hydroxide solution with a volume fraction of 40% and a pH value of 11, and stir and react;

[0018] 2) Dropwise add (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride, continue to react after heating, then pour into a hydrochloric acid solution with a volume fraction of 10%, adjust the pH value of the solution system to neutral, and perform centrifugation;

[0019] 3) Using deionized water as the dialysis medium, dialyze the solution, and freeze-dry the dialyzed solution to obtain modified chitosan.

[0020] Preferably, in the step 1), the constant temperature is 45 - 55 °C, and the stirring reaction time is 50 - 70 min.

[0021] Preferably, in the step 2), heat to 65 - 75 °C and react for 6 - 7 h; the centrifugation speed is 5000 - 7000 r / min, and the centrifugation time is 10 - 20 min.

[0022] Preferably, in the step 3), use a dialysis tube with a molecular weight cut-off of 0.5 kDa to dialyze for 4 - 5 days, and the dialysis medium is changed at least 3 times a day.

[0023] (III) Beneficial effects

[0024] The present invention provides a fabric conditioner with the functions of softness, fragrance retention and color protection. Compared with the prior art, it has the following beneficial effects:

[0025] (1) In the present invention, modified nano-silica can be filled on the surface of fabric fibers to make the fiber surface smoother and reduce the friction between fibers; octanoyl alginate has certain lubricity and can form a lubricating film on the fiber surface; some groups on the molecular chain of modified chitosan can interact with the groups on the fiber surface to increase the flexibility of the fibers. The WE28 softening component is a special softener that can reduce the static friction coefficient between fibers. Their synergistic effect makes the fabric fibers softer and smoother, more comfortable to wear, and can effectively reduce the damage to the fabric during washing and wearing.

[0026] (2) In the present invention, the microcapsules can slowly release the fragrance and extend the fragrance retention time. The microcapsule wall materials formed by modified nano-silica, octanoyl alginate and modified chitosan can protect the fragrance and prevent it from volatilizing prematurely. At the same time, diatomite has certain adsorption ability and can adsorb some fragrance molecules, further delaying the release of the fragrance, so that the fabric continuously emits fragrance during wearing and storage, and the fragrance retention is more lasting and stable.

[0027] (3) In the present invention, modified nano-silica can form a protective film on the surface of the fabric to reduce the influence of external factors on the color of the fabric. Octanoyl alginate and modified chitosan can bind to the fabric fibers to enhance the structural stability of the fibers and reduce fiber damage and color fading caused by processes such as washing. Baking soda has a certain buffering effect and can adjust the pH value of the washing solution to avoid affecting the color of the fabric due to too high or too low pH value. The combined action of these components can effectively reduce fabric fading and maintain the brightness of the fabric. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In this technical solution, the WE28 compliant component is triethanolamine monoester quaternary ammonium salt: Nanjing Xinhua Yuan Chemical Co., Ltd.;

[0030] Fragrance: Jinan Haicheng New Materials Technology Co., Ltd.;

[0031] Pigment: Dezhou Huicai Pigment;

[0032] Baking soda: Jinan Zhangzhou International Trade Co., Ltd.;

[0033] Diatomite: Shandong Xinhongfeng New Materials Technology Co., Ltd.;

[0034] Sodium chloride: Shandong Xinsheng Chemical Co., Ltd.

[0035] Example 1

[0036] (1) Completely mix 2 mL of tetraethyl orthosilicate with 1 mL of γ-glycidoxypropyltrimethoxysilane, then sequentially add 22 mmol of cetyltrimethylammonium bromide, 28.5 mL of deionized water, and 14.2 mL of absolute ethanol. After mixing evenly, heat to 30 °C, stir at a speed of 1100 r / min for 30 min, then perform ultrasonic treatment for 20 min, and then dropwise add 5.5 mL of ammonia water with a mass fraction of 25%. Continue to stir at a speed of 500 r / min at this temperature for 6 h. After the reaction is completed, filter, wash thoroughly with absolute ethanol and deionized water, and finally freeze-dry at -58 °C for 24 h to obtain modified nano-silica;

[0037] (2) Pour 3 g of sodium alginate into 100 g of deionized water. After stirring until it is completely dissolved, adjust the pH value of the system to 3.2 with a hydrochloric acid solution with a concentration of 0.4 mol / L, and then dilute the concentration of the system to 2 wt% with deionized water to obtain Solution 1. Pour 1.22 g of dicyclohexylcarbodiimide hydrochloride into 15 mL of deionized water, and stir until it is completely dissolved to obtain Solution 2. Pour Solution 2 into Solution 1, stir at a speed of 400 r / min for 10 min, slowly add 2.24 g of n-octylamine dropwise, raise the temperature of the water bath to 40 °C, and stir at a speed of 500 r / min for 22 h. After the reaction is completed, add absolute ethanol and then perform suction filtration. The product is washed 3 times with absolute ethanol, then placed in a vacuum drying oven at 50 °C for 24 h, and then taken out and placed in deionized water. After it is completely dissolved, it is dialyzed in pure water for 3 days, and the water is changed every 3 h to obtain octanoyl alginate;

[0038] (3) Under the constant temperature condition of 45 °C, pour 5 g of chitosan into 100 mL of sodium hydroxide solution with a volume fraction of 40% and a pH value of 11, and stir and react for 50 min. Add 40 mL of (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride dropwise, continue to react at 65 °C for 6 h, then pour in a hydrochloric acid solution with a volume fraction of 10%, adjust the pH value of the solution system to neutral, and centrifuge at a speed of 5000 r / min for 10 min. Using deionized water as the dialysis medium, dialyze with a dialysis tube with a cut-off molecular weight of 0.5 kDa for 4 days, and the dialysis medium is changed at least 3 times a day. Freeze-dry the dialyzed solution to obtain modified chitosan;

[0039] (4) Add 1 g of modified nano-silica to 150 mL of deionized water, and ultrasonically disperse it to form a uniform and stable dispersion to obtain Solution A. Add 2 g of octanoyl alginate to 15 mL of deionized water, raise the temperature to 60 °C, and stir and dissolve until a clear and transparent solution is obtained to obtain Solution B. Add 3 g of modified chitosan to 150 mL of a 1% acetic acid solution by mass fraction, and stir at room temperature until the modified chitosan is fully dissolved to obtain Solution C. Mix Solution A, Solution B, and Solution C according to a volume ratio of 1:2:3, and stir and emulsify at a speed of 8000 r / min for 15 min to obtain microcapsules;

[0040] (5) Weigh each component by weight percentage: sodium chloride 80%, WE28 softening ingredient 6%, baking soda 2%, diatomaceous earth 2%, essence 5%, microcapsules 4.9%, pigment 0.1%.

[0041] Example 2

[0042] (1) Mix 2.6 mL of tetraethyl orthosilicate and 1 mL of γ - glycidoxypropyltrimethoxysilane completely. Then, add 23 mmol of cetyltrimethylammonium bromide, 28.5 mL of deionized water, and 14.2 mL of absolute ethanol in sequence. After mixing evenly, heat up to 35 °C, stir at a speed of 1200 r / min for 35 min, then perform ultrasonic treatment for 25 min. Then, dropwise add 5.5 mL of ammonia water with a mass fraction of 25%. Continue to stir at a speed of 600 r / min at this temperature for 7 h. After the reaction is completed, filter, wash thoroughly with absolute ethanol and deionized water, and finally freeze - dry at - 56 °C for 24 h to obtain modified nano - silica;

[0043] (2) Pour 4.5 g of sodium alginate into 100 g of deionized water. After stirring until it is completely dissolved, adjust the pH value of this system to 3.3 with a hydrochloric acid solution with a concentration of 0.4 mol / L. Then, dilute the concentration of the system to 2.3 wt% with deionized water to prepare Solution 1. Pour 1.27 g of 1,6 - hexanediamine dihydrochloride into 15 mL of deionized water. After stirring until it is completely dissolved, prepare Solution 2. Pour Solution 2 into Solution 1, stir at a speed of 500 r / min for 12 min, slowly dropwise add 2.4 g of n - octylamine, heat up to 45 °C in a water bath, and stir at a speed of 600 r / min for 23 h. After the reaction is completed, add absolute ethanol and then perform suction filtration. The product is washed 4 times with absolute ethanol, then placed in a vacuum drying oven at 55 °C for 24 h. Then, take it out and place it in deionized water. After it is completely dissolved, perform dialysis treatment in pure water for 4 days, and change the water every 4 h to obtain octanoyl - aminated alginate;

[0044] (3) Under the constant - temperature condition of 50 °C, pour 6.5 g of chitosan into 100 mL of sodium hydroxide solution with a volume fraction of 40% and a pH value of 11, and stir and react for 60 min. Dropwise add 43 mL of (3 - chloro - 2 - hydroxypropyl) trimethylammonium chloride, heat up to 70 °C and continue to react for 6.5 h. Then, pour in a hydrochloric acid solution with a volume fraction of 10% to adjust the pH value of this solution system to neutral, and centrifuge at a speed of 6000 r / min for 15 min. Using deionized water as the dialysis medium, dialyze with a dialysis tube with a cut - off molecular weight of 0.5 kDa for 5 days, and change the dialysis medium at least 3 times a day. Freeze - dry the dialyzed solution to obtain modified chitosan;

[0045] (4) Add 2 g of modified nano-silica into 150 mL of deionized water, and ultrasonically disperse it until a uniform and stable dispersion is formed to obtain solution A; add 3 g of octanamide alginate into 15 mL of deionized water, heat it to 70 °C, and stir and dissolve it until a clear and transparent solution is obtained to obtain solution B; add 5 g of modified chitosan into 150 mL of a 2% (mass fraction) dilute acetic acid solution, and stir at room temperature until the modified chitosan is fully dissolved to obtain solution C; mix solution A, solution B and solution C according to a volume ratio of 1:2:1, and stir and emulsify at a speed of 10,000 r / min for 20 min to obtain microcapsules;

[0046] (5) Weigh each component by weight percentage: sodium chloride 85%, WE28 softening component 2.7%, baking soda 5%, diatomaceous earth 5%, essence 2%, microcapsules 0.25%, pigment 0.05%.

[0047] Example 3

[0048] (1) Completely mix 3.2 mL of tetraethyl orthosilicate and 1 mL of γ-glycidoxypropyltrimethoxysilane, then successively add 25 mmol of cetyltrimethylammonium bromide, 28.5 mL of deionized water and 14.2 mL of absolute ethanol. After mixing evenly, heat it to 40 °C, stir at a speed of 1300 r / min for 40 min, then ultrasonically treat for 30 min, and then dropwise add 5.5 mL of 25% (mass fraction) ammonia water. Continue to stir at a speed of 700 r / min at this temperature for 8 h. After the reaction is completed, filter, wash thoroughly with absolute ethanol and deionized water, and finally freeze-dry at -55 °C for 24 h to obtain modified nano-silica;

[0049] (2) Pour 5.5 g of sodium alginate into 100 g of deionized water, stir until it is completely dissolved, then adjust the pH value of the system to 3.4 with a 0.4 mol / L hydrochloric acid solution, and then dilute the concentration of the system to 2.5 wt% with deionized water to prepare solution one; pour 1.35 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride into 15 mL of deionized water, stir until it is completely dissolved to prepare solution two; pour solution two into solution one, stir at a speed of 600 r / min for 15 min, slowly dropwise add 2.6 g of n-octylamine, heat the water bath to 50 °C, and stir at a speed of 800 r / min for 25 h; after the reaction is completed, add absolute ethanol and then perform suction filtration. The product is washed 5 times with absolute ethanol, then placed in a vacuum drying oven at 60 °C for 24 h, and then taken out and placed in deionized water. After it is completely dissolved, it is dialyzed in pure water for 5 days, and the water is changed every 5 h to obtain octanamide alginate;

[0050] (3) Under the constant temperature condition of 55 °C, 7.5 g of chitosan was poured into 100 mL of sodium hydroxide solution with a volume fraction of 40% and a pH value of 11, and stirred for reaction for 70 min; 46 mL of (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride was added dropwise, and after heating to 75 °C, the reaction was continued for 7 h. Then, it was poured into a hydrochloric acid solution with a volume fraction of 10% to adjust the pH value of the solution system to neutral, and centrifuged at a speed of 7000 r / min for 20 min; Using deionized water as the dialysis medium, dialysis was carried out for 5 days with a dialysis tube with a cut-off molecular weight of 0.5 kDa, and the dialysis medium was changed at least 3 times a day. The dialyzed solution was freeze-dried to obtain modified chitosan;

[0051] (4) 3 g of modified nano-silica was added to 150 mL of deionized water and ultrasonically dispersed to form a uniform and stable dispersion liquid to obtain solution A; 5 g of octanamide alginate was added to 15 mL of deionized water, and the temperature was raised to 80 °C, and stirred and dissolved until a clear and transparent solution was obtained to obtain solution B; 6 g of modified chitosan was added to 150 mL of dilute acetic acid solution with a mass fraction of 1%-3%, and stirred at room temperature until the modified chitosan was fully dissolved to obtain solution C; Solution A, solution B and solution C were mixed according to a volume ratio of 3:2:1, and stirred and emulsified at a speed of 12000 r / min for 30 min to obtain microcapsules;

[0052] (5) Weigh each component by weight percentage: 90% sodium chloride, 4% WE28 softening ingredient, 4% baking soda, 1% diatomite, 0.9% essence, 0.09% microcapsules, 0.01% pigment.

[0053] Comparative Example 1

[0054] Compared with Example 1, the difference is that the modified nano-silica in Example 1 is replaced by nano-silica, and the modified chitosan solution is replaced by chitosan solution; the rest remains unchanged.

[0055] Comparative Example 2

[0056] Compared with Example 1, the difference is that the modified chitosan solution is not added; the rest remains unchanged.

[0057] Comparative Example 3

[0058] Compared with Example 1, the difference is that the modified nano-silica is not added; the rest remains unchanged.

[0059] Preparation of fabric conditioner: Weigh oil-soluble pigment into a container (plastic bucket), add essence and microcapsules, stir and disperse them to completely dissolve the pigment; then add WE28 softening component, stir and disperse it, and stir it with the pigment and essence to form a uniform solution A; add sodium chloride of 6-8 mesh into a solid stirring tank (clean and impurity-free); add the well-stirred uniform solution A into the stirring tank in multiple small amounts, and tightly cover the lid in time after each addition until the salt is evenly wrapped with the solution; add baking soda, also in multiple small amounts, cover the lid and stir in time after each addition; finally add diatomite, also in multiple small amounts, cover the lid and stir in time after each addition, and stir until it becomes colored salt particles and no powder can be seen with the naked eye.

[0060] Softness test: Feel the comfort of the washed clothes by hand and score them according to the soft comfort of the clothes. The scoring standard is that the higher the soft comfort of the clothes, the higher the score, and the score ranges from 0 to 10; the results are shown in Table 1.

[0061] Fragrance retention effect test: Place the dried clothes at room temperature, rub the clothes regularly for 10 s every day, and record the time (days) when the clothes no longer emit fragrance during rubbing; the results are shown in Table 1.

[0062] Color protection effect test: Use a color difference meter to measure the color of the clothes before and after washing, and calculate the color difference ΔE of the clothes before and after using the fabric conditioner; the results are shown in Table 1.

[0063]

[0064] Compared with Comparative Examples 1-3, the softness, fragrance retention effect and color protection effect in Examples 1-3 are significantly improved.

[0065] In Comparative Example 1, chitosan was not modified. Since the solubility of chitosan itself is poor, its particle size distribution and stability become worse, resulting in poor microcapsule effects; at the same time, unmodified nano-silica has a weak binding ability with other components during the formation of microcapsules, resulting in an insufficiently tight structure of the microcapsules, affecting their performance, and its dispersion is not uniform enough, resulting in inability to disperse continuously and evenly on the surface of the clothes.

[0066] In Comparative Example 2, modified chitosan was not added, which enhanced the interaction between microcapsules and caused agglomeration, thus affecting the stability and use effect of the conditioner.

[0067] In Comparative Example 3, since the functional groups on the surface of the modified nano-silica can undergo chemical bonding or strong physical interactions with octanoyl alginate amine and modified chitosan, without adding the modified nano-silica, the structure of the microcapsule wall may be relatively loose, with poor integrity, and the particle size of the unmodified nano-silica is difficult to precisely control, thus affecting the sustained-release performance of the microcapsules; moreover, the dye is more likely to fall off during the washing process of the clothing, the color retention ability of the clothing becomes poor, and the color protection effect is reduced.

[0068] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fabric conditioner with the functions of softening, fragrance retention and color protection, characterized in that, The fabric conditioner, by weight percentage, comprises: 80 - 90% of sodium chloride, 1 - 6% of WE28 softening component, 2 - 8% of baking soda, 2 - 8% of diatomite, 0.2 - 5% of essence, 0.05 - 5% of microcapsules, and 0.006 - 0.1% of pigment; Among them, the microcapsules are prepared by compounding modified nano - silica, modified chitosan solution and octanoyl amine alginate solution, and their volume ratio is 1:2:3 - 3:2:

1.

2. The fabric conditioner with the functions of softness, fragrance retention and color protection according to claim 1, characterized in that: The preparation method of the modified nano - silica: Completely mix the silane precursor and the silane coupling agent containing epoxy groups, then successively add cetyltrimethylammonium bromide, deionized water and absolute ethanol. After mixing evenly, heat up to 30 - 40 °C, stir at a speed of 1100 - 1300 r / min for 30 - 40 min, then perform ultrasonic treatment for 20 - 30 min. Then add ammonia water dropwise, and continue to stir at a speed of 500 - 700 r / min at this temperature for 6 - 8 h. After the reaction is completed, filter, wash thoroughly with absolute ethanol and deionized water, and finally freeze - dry at a temperature of - 58 - - 55 °C for 24 h to obtain the modified nano - silica.

3. The fabric conditioner with the functions of softness, fragrance retention and color protection according to claim 1, characterized in that: The preparation of octanoyl amine alginate: (1) Pour sodium alginate into deionized water, stir until it is completely dissolved, then adjust the pH value of the system with a hydrochloric acid solution with a concentration of 0.4 mol / L, and then dilute it with deionized water to obtain Solution 1; (2) Pour carbodiimide hydrochloride into deionized water, stir until it is completely dissolved to obtain Solution 2; (3) Pour Solution 2 into Solution 1, stir, and then slowly add n - octylamine, and continue to stir and react after heating in a water bath; (4) After the reaction is completed, add absolute ethanol and then perform suction filtration. The product is washed 3 - 5 times with absolute ethanol, then placed in a vacuum drying oven at 50 - 60 °C for 24 h, then taken out and placed in deionized water. After complete dissolution, dialysis treatment is carried out in pure water for 3 - 5 days, and the water is changed every 3 - 5 h.

4. The fabric conditioner with the functions of softness, fragrance retention and color protection according to claim 3, characterized in that: In the above (1), the pH value of the system is adjusted to 3.2 - 3.4, and the concentration of the diluted system is adjusted until it is 2 - 2.5 wt%.

5. The fabric conditioner with the functions of softness, fragrance retention and color protection according to claim 3, characterized in that: In the above (3), first stir at a speed of 400 - 600 r / min for 10 - 15 min; after heating in a water bath to 40 - 50 °C, stir at a speed of 500 - 800 r / min for 22 - 25 h.

6. A fabric conditioner having the functions of softness, fragrance retention and color protection according to claim 1, characterized in that: The preparation method of the modified chitosan: 1) Under constant temperature conditions, pour chitosan into a sodium hydroxide solution with a volume fraction of 40% and a pH value of 11, and stir and react; 2) Dropwise add (3 - chloro - 2 - hydroxypropyl) trimethyl ammonium chloride, continue to react after heating, then pour into a hydrochloric acid solution with a volume fraction of 10%, adjust the pH value of the solution system to neutral, and perform centrifugation; 3) Use deionized water as the dialysis medium to dialyze the solution, and freeze - dry the dialyzed solution to obtain the modified chitosan.

7. The fabric conditioner with the functions of softness, fragrance retention and color protection according to claim 6, characterized in that: In the above 1), the constant temperature is 45 - 55 °C, and the stirring reaction time is 50 - 70 min.

8. The fabric conditioner with the functions of softening, fragrance retention and color protection according to claim 6, characterized in that: In the above 2), heat to 65 - 75 °C, react for 6 - 7 h; the centrifugation speed is 5000 - 7000 r / min, and the centrifugation time is 10 - 20 min.

9. The fabric conditioner having softening, fragrance retention and color protection effects according to claim 6, characterized in that: In the above (3), dialysis was carried out using a dialysis tube with a molecular weight cut-off of 0.5 kDa for 4 - 5 days, and the dialysis medium was changed at least 3 times a day.

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