Cool-feeling microcapsule as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of textiles, and particularly relates to a cool microcapsule and a preparation method and application thereof. The preparation method of the cool-feeling microcapsule comprises the following steps: mixing isopiperidinol, methoxy propylene glycol and menthyl lactate to obtain a core material, and preparing the core material into the cool-feeling microcapsule by adopting a complex coacervation method. When the prepared cool-feeling microcapsule is in contact with skin, vasodilation and blood flow volume increase can be caused, so that the caused biological cool feeling can last for about 1 hour, and the fabric has a lasting cool feeling effect (namely, the fabric has a steady-state cool feeling); the cool-feeling microcapsule is prepared by taking a composition consisting of isopiperitol, methoxy propylene glycol and menthyl lactate as a core material, so that the biological cool feeling is relatively mild in irritation, and a pleasant cool feeling can be generated; by using polyacrylic acid as an adhesive, the cool microcapsules can be stably fixed on the fabric, so that the washability of the cool effect of the fabric is improved.

Description

Technical Field

[0001] The present application relates to the field of textile technology, and in particular to a cooling microcapsule and a preparation method and application thereof. Background Art

[0002] The human body will exchange heat and moisture with the external environment. When fabric contacts human skin, heat exchange will occur, causing the skin temperature to rise or fall, making the human body feel hot or cold, that is, the fabric's sense of warmth and coldness. Under normal circumstances, the temperature of the fabric is relatively low, and the temperature of the skin is relatively high. When the skin first contacts the fabric, it often causes the skin temperature to drop. Common clothing fabrics produce a cold feeling when they first contact the human body, also known as contact coolness. This cool feeling belongs to the instantaneous contact coolness, which is the subjective feeling of the human body when the fabric with a lower temperature produces a cold stimulation to the skin at the moment of contact. At the moment when the fabric first contacts the skin, it takes away part of the skin's heat in a short period of time, and the cool feeling produced is the instantaneous contact coolness. The instantaneous contact coolness is closely related to factors such as the thermal conductivity of the fabric, the specific heat capacity, and the temperature difference between the fabric and the skin.

[0003] Cooling functional fabrics are made by modifying the fiber raw materials or designing the fabric structure, finishing and other methods to make the fabric have the functions of rapidly dissipating body heat, accelerating perspiration and cooling. Cooling functional fabrics are widely used in underwear, shirts, bedding, clothing fabrics and other products.

[0004] In the related art, during the processing and manufacturing of cooling functional fabrics, the thermal conductivity of the fabric is increased and its thermal resistance is reduced to quickly release and discharge the heat generated by the human body, thereby improving the body's stuffiness and enhancing the comfort of wearing. Cooling fibers usually have a high thermal conductivity, but the fabrics made from them only have an instantaneous cool feeling when touched, making it difficult for consumers to obtain a lasting cooling and comfortable experience. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the present invention provides a cooling microcapsule and a preparation method and application thereof, so as to solve the technical problem that the above-mentioned cooling fibers usually have a high thermal conductivity, but the fabrics made therefrom only have an instantaneous cooling sensation upon contact, making it difficult for consumers to obtain a lasting cooling and comfortable experience.

[0006] To achieve the above objectives, the scheme of this application is as follows: In a first aspect, the present invention provides a method for preparing cooling microcapsules, comprising the following steps: Isopiperine menthol, methoxypropylene glycol and menthyl lactate are mixed to obtain a core material, and the core material is made into cooling microcapsules by a complex coacervation method.

[0007] Optionally, the molar ratio of isopiperitol, methoxypropylene glycol and menthyl lactate is 25-35:45-55:15-25, preferably 8-35:48-55:18-25.

[0008] Optionally, preparing the core material into cooling microcapsules by a complex coacervation method comprises: S1. Add the core material and the emulsifier to the gelatin solution and stir to obtain an emulsion; S2. Add sodium alginate to the emulsion under stirring, adjust the pH of the system to 4.2-4.4, filter, and dry to obtain the cooling microcapsules.

[0009] Optionally, in step S1, the emulsifier is selected from at least one of dodecyl sulfate, dodecylbenzene sulfonate and lecithin.

[0010] Optionally, in step S1, the mass ratio of the emulsifier to the core material is 0.1-0.3:1, preferably 0.15-0.3:1.

[0011] Optionally, in the emulsion of step S1, the volume concentration of the emulsifier is 0.3%-0.7%, preferably 0.4%-0.7%.

[0012] Optionally, in step S2, the mass ratio of the sodium alginate to the gelatin is 0.5-1.5:3-5, preferably 0.6-1.5:3-5.

[0013] Optionally, in step S2, the mass ratio of the total mass of the sodium alginate and the gelatin to the mass of the core material is 0.5-1.5:0.5-1.5, preferably 0.6-1.5:0.6-1.5.

[0014] In a second aspect, the present invention also provides cooling microcapsules prepared according to the method described above.

[0015] In a third aspect, the present invention also provides a method for preparing a cool fabric, comprising preparing a finishing liquid with an adhesive, a dispersant, a stabilizer and the cool microcapsules prepared according to the method as described above, and using the finishing liquid to impregnate, pre-dry and bake a grey cloth made of polyester fiber to prepare the cool fabric.

[0016] Optionally, the binder is selected from polyacrylic acid.

[0017] Optionally, the mass ratio of the adhesive to the cooling microcapsules is 0.3-0.6:50, preferably 0.4-0.6:50.

[0018] Optionally, the dispersant is selected from at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester and polycarboxylate.

[0019] Optionally, the mass ratio of the dispersant to the cooling microcapsules is 0.03-0.06:50, preferably 0.04-0.06:50.

[0020] Optionally, the stabilizer is selected from at least one of xanthan gum, carbomer and hydroxyethyl cellulose.

[0021] Optionally, the mass ratio of the stabilizer to the cooling microcapsules is 0.1-0.2:50, preferably 0.12-0.2:50.

[0022] Optionally, the pre-drying temperature is 75-85°C, preferably 78-85°C; the pre-drying time is 2-4 min, preferably 3-4 min.

[0023] Optionally, the baking temperature is 115-125° C., preferably 118-125° C.; the baking time is 2-4 min, preferably 3-4 min.

[0024] In a fourth aspect, the present application also provides a cool fabric prepared according to the method described above.

[0025] Beneficial effects of the present invention: The cooling microcapsules prepared by the present invention can cause vasodilation and increase blood flow when in contact with the skin, thereby causing the biological cooling sensation to last for nearly 1 hour, so that the fabric has a lasting cooling effect (ie, the fabric has a steady-state cooling sensation).

[0026] The invention uses a composition consisting of isopiperitol, methoxypropylene glycol and menthyl lactate as a core material to prepare a cooling microcapsule, which has a relatively mild biological cooling irritation and can produce a pleasant cooling sensation.

[0027] The invention uses polyacrylic acid as an adhesive, so that the cooling microcapsules can be stably fixed on the fabric, thereby improving the washing resistance of the cooling effect of the fabric. DETAILED DESCRIPTION

[0028] The present invention is implemented or applied through different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0029] An embodiment of the present invention provides a method for preparing cooling microcapsules, comprising the following steps: Mix isopiperitol, methoxypropylene glycol and menthyl lactate in a molar ratio of 25-35:45-55:15-25 to obtain a core material; The core material is made into cooling microcapsules by complex coacervation method: S1. Add the core material and the emulsifier to the gelatin solution and stir to obtain an emulsion having a volume concentration of 0.3%-0.7% of the emulsifier; The emulsifier is selected from at least one of dodecyl sulfate, dodecylbenzene sulfonate and lecithin, and the mass ratio of the emulsifier to the core material is 0.1-0.3:1; S2. Sodium alginate was added to the emulsion under stirring, the pH of the system was adjusted to 4.2-4.4, filtered, and dried to obtain cooling microcapsules; The mass ratio of sodium alginate to gelatin is 0.5-1.5:3-5, and the mass ratio of the total mass of sodium alginate and gelatin to the core material is 0.5-1.5:0.5-1.5.

[0030] Another embodiment of the present invention also provides cooling microcapsules prepared according to the method as described above.

[0031] Another embodiment of the present invention provides a method for preparing a cool fabric, comprising preparing a finishing liquid with a mass ratio of 0.3-0.6:0.03-0.06:0.1-0.2:50, and padding a grey cloth made of polyester fiber with the finishing liquid, pre-drying the fabric at 75-85°C for 2-4 minutes, and then baking the fabric at 115-125°C for 2-4 minutes to prepare the cool fabric. The dispersant is selected from at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester and polycarboxylate; the stabilizer is selected from at least one of xanthan gum, carbomer and hydroxyethyl cellulose; Another embodiment of the present invention is a cool fabric prepared according to the method described above.

[0032] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0033] Example 1 A method for preparing a cool fabric, the specific steps are as follows: (I) Preparation of cooling microcapsules, the specific steps are: isopiperitol, methoxypropylene glycol and menthyl lactate were mixed in a molar ratio of 35:45:20 to obtain a core material; (ii) Using complex coacervation method to make the core material into cooling microcapsules: S1. Add the core material and sodium dodecyl sulfate (the mass ratio of sodium dodecyl sulfate to the core material is 0.3:1) to the gelatin solution, stir for 9 minutes, and obtain an emulsion with a volume concentration of 0.7% sodium dodecyl sulfate; S2. sodium alginate was added to the emulsion under stirring at 600 rpm (the mass ratio of sodium alginate to gelatin was 1.5:5, and the mass ratio of the total mass of sodium alginate and gelatin to the core material was 1.5:0.5), acetic acid was added to the system to adjust the pH of the system to 4.2, filtered, and dried to obtain cooling microcapsules; (III) Preparation of finishing liquid Add the cooling microcapsules into deionized water to obtain a suspension with a concentration of 55 g / L; Add polyacrylic acid, fatty alcohol polyoxyethylene ether AEO-9 and xanthan gum to the suspension, stir evenly to obtain a finishing solution, the mass ratio of polyacrylic acid, fatty alcohol polyoxyethylene ether AEO-9 and xanthan gum to cooling microcapsules is 0.6:0.03:0.1:50; (IV) Post-processing The polyester filaments are woven into fabric on a rapier loom, the fabric structure is 1:1 plain weave, the warp and weft density is 38×28 threads / cm, and the grey fabric is obtained; The grey cloth was impregnated with finishing liquid, the mass ratio of finishing liquid to grey cloth was 15:1, the liquid pressing rate was 75%, and then pre-dried at 85°C for 2 minutes, and then baked at 125°C for 2 minutes to obtain a cool fabric.

[0034] Example 2 A method for preparing a cool fabric, the specific steps are as follows: (I) Preparation of cooling microcapsules, the specific steps are: isopiperitol, methoxypropylene glycol and menthyl lactate were mixed in a molar ratio of 25:50:25 to obtain a core material; (ii) Using complex coacervation method to make the core material into cooling microcapsules: S1. Add the core material and sodium dodecylbenzene sulfonate (the mass ratio of sodium dodecylbenzene sulfonate to the core material is 0.1:1) to the gelatin solution, stir for 9 minutes, and obtain an emulsion with a volume concentration of 0.3% of sodium dodecylbenzene sulfonate; S2. sodium alginate was added to the emulsion under stirring at 600 rpm (the mass ratio of sodium alginate to gelatin was 0.5:3, and the mass ratio of the total mass of sodium alginate and gelatin to the core material was 0.5:1.5), acetic acid was added to the system to adjust the pH of the system to 4.2, filtered, and dried to obtain cooling microcapsules; (III) Preparation of finishing liquid Add the cooling microcapsules into deionized water to obtain a suspension with a concentration of 60 g / L; Add polyacrylic acid, fatty acid polyoxyethylene ester LAE-4 and carbomer to the suspension, stir evenly to obtain a finishing solution, wherein the mass ratio of polyacrylic acid, fatty acid polyoxyethylene ester LAE-4, carbomer and cooling microcapsules is 0.3:0.06:0.2:50; (IV) Post-processing The polyester filaments are woven into fabric on a rapier loom, the fabric structure is 1:1 plain weave, the warp and weft density is 38×28 threads / cm, and the grey fabric is obtained; The grey cloth was impregnated with finishing liquid, the mass ratio of finishing liquid to grey cloth was 12:1, the liquid pressing rate was 73%, and then pre-dried at 75°C for 2 minutes, and then baked at 115°C for 4 minutes to obtain a cool fabric.

[0035] Example 3 A method for preparing a cool fabric, the specific steps are as follows: (I) Preparation of cooling microcapsules, the specific steps are: isopiperitol, methoxypropylene glycol and menthyl lactate were mixed in a molar ratio of 30:55:15 to obtain a core material; (ii) Using complex coacervation method to make the core material into cooling microcapsules: S1. Add the core material and lecithin (the mass ratio of lecithin to the core material is 0.2:1) to the gelatin solution, stir for 9 minutes, and obtain an emulsion with a volume concentration of lecithin of 0.5%; S2. sodium alginate was added to the emulsion under stirring at 600 rpm (the mass ratio of sodium alginate to gelatin was 1:4, and the mass ratio of the total mass of sodium alginate and gelatin to the core material was 1:1), acetic acid was added to the system to adjust the pH of the system to 4.3, filtered, and dried to obtain cooling microcapsules; (III) Preparation of finishing liquid Add the cooling microcapsules into deionized water to obtain a suspension with a concentration of 65 g / L; Add polyacrylic acid, sodium polycarboxylate MDH and hydroxyethyl cellulose to the suspension, stir evenly to obtain a finishing solution, wherein the mass ratio of polyacrylic acid, sodium polycarboxylate MDH, hydroxyethyl cellulose and cooling microcapsules is 0.5:0.05:0.15:50; (IV) Post-processing The polyester filaments are woven into fabric on a rapier loom, the fabric structure is 1:1 plain weave, the warp and weft density is 38×28 threads / cm, and the grey fabric is obtained; The grey cloth was impregnated with finishing liquid, the mass ratio of finishing liquid to grey cloth was 10:1, the liquid pressing rate was 70%, and then pre-dried at 80°C for 3 minutes, and then baked at 120°C for 3 minutes to obtain a cool fabric.

[0036] Comparative Example 1 A cooling fabric was prepared in the same manner as in Example 1 except that isopiperitol was used as the core material.

[0037] Comparative Example 2 A cool feeling fabric was prepared in the same manner as in Example 1 except that methoxypropylene glycol was used as the core material.

[0038] Comparative Example 3 A cool feeling fabric was prepared in the same manner as in Example 1 except that menthyl lactate was used as the core material.

[0039] Comparative Example 4 A cool fabric was prepared in the same manner as in Example 1, except that a composition of isopiperitol and methoxypropylene glycol in a molar ratio of 25:50 was used as the core material.

[0040] Comparative Example 5 A cool fabric was prepared in the same manner as in Example 1, except that a composition consisting of isopiperitol and menthyl lactate in a molar ratio of 25:25 was used as the core material.

[0041] Comparative Example 6 A cool fabric was prepared in the same manner as in Example 1, except that a composition consisting of methoxypropylene glycol and menthyl lactate mixed in a molar ratio of 50:25 was used as the core material.

[0042] Comparative Example 7 A cool fabric was prepared in the same manner as in Example 1 except that N-hydroxymethyl acrylamide was used instead of polyacrylic acid.

[0043] Comparative Example 8 A cool fabric was prepared in the same manner as in Example 1, except that polymaleic acid was used instead of polyacrylic acid.

[0044] Sensory evaluation 20 sensory evaluators were selected to form a photosensitivity evaluation team, and the fabrics made in Examples 1-3 and Comparative Examples 1-8 were subjected to sensory evaluation of coolness. Specifically, samples of 10 cm*cm in size were taken from the fabrics made in Examples 1-3 and Comparative Examples 1-8, and the fabric samples were placed on the same part of the arm of the sensory evaluators for 30 minutes, and the sensory evaluation of coolness was performed after 5 minutes and 30 minutes. The evaluation criteria were 8-10: strong coolness; 4-7: relatively strong coolness; 1-3: slightly coolness; 0: no coolness. The average of the scores of the 20 sensory evaluators was taken as the result, and the results are shown in Table 1. Each sample was washed 50 times and the coolness sensory evaluation was performed again using the same method as above.

[0045] Table 1 Results of sensory evaluation of coolness

[0046] As shown in Table 1, before and after washing, the coolness sensory evaluation scores of the cool fabrics prepared in Examples 1-3 did not change significantly. This result shows that the cool microcapsules prepared in the present invention can make the fabric have a lasting cool effect (i.e., the fabric has a steady-state cool feeling), which can make the human body feel pleasant coolness and increase the comfort of the fabric.

[0047] As shown in Table 1, compared with Comparative Examples 1-6, the score of the coolness sensory evaluation of the fabric of Example 1 is significantly increased. This result shows that the present invention can further improve the coolness effect of the fabric by preparing the cool microcapsules with the composition of isopiperitol, methoxypropylene glycol and menthyl lactate as the core material.

[0048] As shown in Table 1, the scores of the sensory evaluation of the coolness of Comparative Examples 7 and 8 decreased significantly before and after washing, while the score of the sensory evaluation of the coolness of the fabric of Example 1 did not change significantly before and after washing. This result shows that the present invention can stably fix the cool microcapsules on the fabric by using polyacrylic acid as a binder, thereby improving the washing resistance of the cool effect of the fabric.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for preparing cooling microcapsules, characterized in that: The following steps are involved: Isopiperine menthol, methoxypropylene glycol and menthyl lactate are mixed to obtain a core material, and the core material is made into a cooling microcapsule by a complex coacervation method.

2. The preparation method according to claim 1, characterized in that The molar ratio of isopiperitol, methoxypropylene glycol and menthyl lactate is 25-35:45-55:15-25.

3. The preparation method according to claim 1, characterized in that: The method of preparing the core material into cooling microcapsules by a complex coacervation method comprises: S1. Add the core material and the emulsifier to the gelatin solution and stir to obtain an emulsion; S2. Add sodium alginate to the emulsion under stirring, adjust the pH of the system to 4.2-4.4, filter, and dry to obtain the cooling microcapsules.

4. The preparation method according to claim 3, characterized in that: In step S1, the emulsifier is selected from at least one of dodecyl sulfate, dodecylbenzene sulfonate and lecithin; And / or, in the emulsion of step S1, the volume concentration of the emulsifier is 0.3%-0.7%; And / or, in step S1, the mass ratio of the emulsifier to the core material is 0.1-0.3:

1.

5. The preparation method according to claim 3, characterized in that: In step S2, the mass ratio of the sodium alginate to the gelatin is 0.5-1.5:3-5; And / or, in step S2, the mass ratio of the total mass of the sodium alginate and the gelatin to the mass of the core material is 0.5-1.5:0.5-1.

5.

6. Cooling microcapsules obtained by the method according to any one of claims 1 to 5.

7. A method for preparing a cool fabric, characterized in that: The cool fabric is prepared by preparing a finishing liquid with an adhesive, a dispersant, a stabilizer and the cool microcapsules prepared by the method according to any one of claims 1 to 5, and using the finishing liquid to pad, pre-dry and bake the grey cloth made of polyester fiber.

8. The preparation method according to claim 7, characterized in that: The adhesive is selected from polyacrylic acid; and / or, the mass ratio of the adhesive to the cooling microcapsules is 0.3-0.6:50; And / or, the dispersant is selected from at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester and polycarboxylate; and / or, the mass ratio of the dispersant to the cooling microcapsules is 0.03-0.06:50; And / or, the stabilizer is selected from at least one of xanthan gum, carbomer and hydroxyethyl cellulose; And / or, the mass ratio of the stabilizer to the cooling microcapsules is 0.1-0.2:

50.

9. The preparation method according to claim 7, characterized in that: The pre-drying temperature is 75-85°C, and the pre-drying time is 2-4 minutes; And / or, the baking temperature is 115-125° C., and the baking time is 2-4 min.

10. A cool fabric obtained according to the method of any one of claims 7 to 9.

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