Plant-modified antibacterial and deodorizing biofunctional PU insoles and their production process

Abstract

This invention provides an antibacterial and odor-removing biofunctional PU insole modified with plant active ingredients and its production process, belonging to the field of PU insole technology. The production process includes extracting plant active ingredients, preparing slow-release granules, preparing a foam layer, preparing a foot-adhesive layer, and a composite step. In preparing the foam layer, polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed at a controlled mixing temperature of 78-84℃. Then, additives and slow-release granules are added, and stirring continues. After uniform stirring, isocyanate is added for reaction, with the reaction time controlled at 1.1-1.4 hours and the reaction temperature at 90-96℃. After the reaction is complete, the foam layer is obtained. The PU insole obtained by this invention has long-lasting antibacterial, odor-removing, and anti-mildew properties, and also possesses excellent resilience, breathability, tensile strength, and low deformation rate at high temperatures.

Description

Technical Field

[0001] This invention belongs to the field of PU insole technology, specifically relating to an antibacterial and odor-removing biofunctional PU insole modified with plant active ingredients and its production process. Background Technology

[0002] Shoes are an indispensable daily necessity for human beings to live and work. Insoles are an important part of shoes and directly affect the comfort of shoes. Most insoles sold on the market are made of cotton. Although they feel comfortable to wear, cotton insoles are very common in terms of absorbing foot sweat and causing foot odor, especially for feet that sweat easily. Furthermore, bacteria can easily grow and multiply inside damp shoes, which can have a significant impact on the feet. Some insoles made with existing technology are made of plastic or polymer materials, which have poor moisture absorption and do not have the effect of removing odors or antibacterial properties. Technicians usually add some antibacterial substances during the manufacturing process, which can play a certain role in inhibiting bacteria, removing odors and preventing mold, but the effect is not long-lasting and cannot meet the requirements for use. Therefore, providing an antibacterial and odor-removing biofunctional PU insole modified with plant active ingredients and its production process to ensure its long-lasting antibacterial, odor-removing, and mildew-proof properties is a technical problem that urgently needs to be solved in the existing technology. Summary of the Invention

[0003] To address the technical problems existing in the prior art, this invention provides an antibacterial and odor-removing biofunctional PU insole modified with plant active ingredients and its production process, which has long-lasting antibacterial, odor-removing, and anti-mildew properties.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: 1. Extraction of active plant components The plant leaves are washed, dried, and ground into powder in a grinder. An ethanol solution is added, and the mixture is placed in an ultrasonic extraction device. The ultrasonic extraction time is controlled at 40-50 minutes and the extraction temperature is 46-50℃. The extracted solution is then filtered, evaporated, dried, and concentrated to obtain a concentrated solution. The concentrated solution is then spray-dried to obtain the plant active ingredients. The plant is one of the following: mugwort, isatis root, yucca, or tea. The mass ratio of the plant leaves to the ethanol solution is 1:12-15; The mass concentration of the ethanol solution is 62-66%; The evaporation occurs at a temperature of 48-52℃. The spray drying process is carried out at a temperature of 140-144℃.

[0005] 2. Preparation of sustained-release granules (1) Preparation of modified attapulgite soil Attapulgite is placed in a high-temperature sealed container, and the container is evacuated to 0.08-0.14 MPa. Then, nitrogen is introduced to a pressure of 3.0-3.6 MPa, and the temperature is raised to 122-128℃. After sealing for 26-32 minutes, the pressure is rapidly released, and the temperature is lowered to 14-18℃. Then, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate are added, and the mixture is stirred for 15-21 minutes. Then, the temperature is raised to 90-93℃ at a rate of 0.1-0.4℃ / min, and the mixture is heat-treated at 90-93℃ for 30-36 minutes. After drying, modified attapulgite is obtained. The attapulgite clay has a specific gravity of 2.10-2.16 and a particle size of 80-90 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 16-19:45-48:1.0-1.6:1.4-1.7:1.0-1.3. (2) Preparation of solutions containing plant active ingredients The plant active ingredients are mixed with deionized water, and the stirring temperature is controlled at 58-64℃ for 25-31 min. Then xanthan gum, gelatin, gum arabic and ethyl cellulose are added and mixed evenly. The mixture is then frozen at -27 to -21℃ for 30-36 min. After the freezing treatment, the mixture is allowed to return to room temperature naturally to obtain a solution containing plant active ingredients. The mass ratio of the plant active ingredients, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 8-12:73-77:1.3-1.7:1.0-1.3:1.1-1.4:0.8-1.2. (3) Mixing Modified attapulgite was mixed with a solution containing plant active ingredients. After stirring evenly, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and betaine were added. Then, two homogenization treatments were performed. The first homogenization treatment lasted for 4-7 minutes and the homogenization pressure was 2.4-2.7 MPa. The second homogenization treatment lasted for 6-9 minutes and the homogenization pressure was 1.8-2.2 MPa. After the homogenization treatment was completed, the mixture was dried to obtain slow-release granules. The mass ratio of the modified attapulgite, the solution containing plant active ingredients, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine is 2.4-2.7:16.0-17.0:1.1-1.4:1.2-1.6:2.3-2.7:0.6-0.9.

[0006] 3. Preparation of the foaming layer Polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed and the mixing temperature is controlled at 78-84℃. Then, additives and slow-release granules are added and stirring is continued. After stirring evenly, isocyanate is added to react and the reaction time is controlled at 1.1-1.4h and the reaction temperature is controlled at 90-96℃. After the reaction is completed, a foamed layer is obtained. The polyether polyol has a molecular weight of 11,100-11,500. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release granules, and diisocyanate is 47.2-47.8:2.3-2.7:3.4-3.7:1.8-2.2:1.3-1.6:1.1-1.4:4.8-5.4:28-32; The preparation method of the additive is as follows: Alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 6-12:1, the ball milling speed at 430-470 rpm, the ball milling time at 22-26 min, and the ball milling temperature at 38-43℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 4-10:1, the ball milling speed at 200-220 rpm, the ball milling time at 34-38 min, and the ball milling temperature at 18-24℃. After the ball milling treatment, the mixture is placed at 1.0-1.6℃ and allowed to stand for 38-44 min. After standing, the mixture is dried to obtain the additive. The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 13-19:38-50:1.0-1.6:1.3-1.7.

[0007] 4. Preparation of the foot-adhesive layer Polyester fibers are spun into single yarns, twisted into yarns, and then spun into greige fabric to make the foot layer. The polyester fiber is obtained from the patent with application number 2022105904295.

[0008] 5. Composite The foot-adhesive layer is bonded to the top of the foam layer to produce a PU insole.

[0009] Compared with the prior art, the present invention achieves the following beneficial effects: 1. The PU insole of the present invention has an antibacterial rate of 95.1-97.5% against Staphylococcus aureus, an antibacterial rate of 95.4-97.1% against Candida albicans, and an antibacterial rate of 94.5-96.8% against Escherichia coli; After 100 standard washes, the inhibition rate against Staphylococcus aureus was 90.4-93.6%, against Candida albicans was 91.8-94.0%, and against Escherichia coli was 89.5-92.2%. 2. The PU insole of the present invention has a removal rate of 95.2-98.7% for ammonia odor and a removal rate of 94.1-97.6% for acetic acid odor; After 100 standard washes, the removal rate of ammonia odor was 89.5-93.6%, and the removal rate of acetic acid odor was 90.1-94.2%. 3. The PU insole of this invention has a mildew resistance rating of 0, and after 100 standard washes, the mildew resistance rating remains at 0. 4. The PU insole of this invention has a rebound rate of 79-84% and an air permeability of 781-794 ml / m³. 2 The tensile strength is 17.4-19.5 kg / cm². 2 The deformation rate at 100℃ is 0.1-0.4%. Detailed Implementation

[0010] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention are now described.

[0011] Example 1 1. Extracting active ingredients from mugwort The mugwort leaves were washed, dried, and ground into powder in a grinder. An ethanol solution was added, and the mixture was placed in an ultrasonic extraction device. The ultrasonic extraction time was controlled at 45 minutes and the extraction temperature was 48°C. The extracted solution was then filtered, evaporated, dried, and concentrated to obtain a concentrated solution. The concentrated solution was then spray-dried to obtain the active ingredients of mugwort. The mass ratio of the mugwort leaves to the ethanol solution is 1:13; The ethanol solution has a mass concentration of 64%. The evaporation is carried out at a temperature of 50°C. The spray drying process is carried out at a temperature of 142°C.

[0012] 2. Preparation of sustained-release granules (1) Preparation of modified attapulgite soil Attapulgite was placed in a high-temperature sealed container, the container was evacuated to 0.10 MPa, and then nitrogen was introduced to a pressure of 3.2 MPa. The temperature was raised to 124°C and sealed for 28 min. Then the pressure was rapidly released and the temperature was lowered to 15°C. Deionized water, tartaric acid, polyvinylpyrrolidone and sodium alginate were added and stirred for 17 min. Then the temperature was raised to 91°C at a rate of 0.2°C / min and heat-treated at 91°C for 32 min. After drying, modified attapulgite was obtained. The attapulgite clay has a specific gravity of 2.12 and a particle size of 85 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 17:46:1.2:1.5:1.1. (2) Preparation of a solution containing active ingredients of Artemisia argyi The active ingredients of Artemisia argyi were mixed with deionized water, and the stirring temperature was controlled at 60℃ for 27 minutes. Then xanthan gum, gelatin, gum arabic and ethyl cellulose were added and mixed evenly. The mixture was then frozen at -25℃ for 32 minutes. After the freezing treatment, the mixture was allowed to return to room temperature naturally to obtain a solution containing the active ingredients of Artemisia argyi. The mass ratio of the active ingredients of Artemisia argyi, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 10:75:1.5:1.2:1.3:1.0. (3) Mixing Modified attapulgite clay was mixed with a solution containing Artemisia argyi active ingredients. After stirring evenly, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and betaine were added. Then, two homogenization treatments were performed. The first homogenization treatment lasted for 5 minutes and the homogenization pressure was 2.6 MPa. The second homogenization treatment lasted for 7 minutes and the homogenization pressure was 2.0 MPa. After the homogenization treatment was completed, the slow-release granules were obtained by drying. The mass ratio of the modified attapulgite, the solution containing Artemisia argyi active ingredients, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine is 2.5:16.3:1.2:1.4:2.5:0.7.

[0013] 3. Preparation of the foaming layer Polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed and the mixing temperature is controlled at 80℃. Then, additives and slow-release particles are added and stirring is continued. After stirring evenly, isocyanate is added to react and the reaction time is controlled at 1.2h and the reaction temperature is controlled at 92℃. After the reaction is completed, a foamed layer is obtained. The polyether polyol has a molecular weight of 11,300. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release particles, and diisocyanate is 47.5:2.5:3.5:2:1.5:1.2:5.1:30. The preparation method of the additive is as follows: Alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 10:1, the ball milling speed at 450 rpm, the ball milling time at 24 min, and the ball milling temperature at 41℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 6:1, the ball milling speed at 210 rpm, the ball milling time at 36 min, and the ball milling temperature at 20℃. After the ball milling treatment, the mixture is placed at 1.2℃ and allowed to stand for 40 min. After standing, the mixture is dried to obtain the additive. The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 15:42:1.2:1.5.

[0014] 4. Preparation of the foot-adhesive layer Polyester fibers are spun into single yarns, twisted into yarns, and then spun into greige fabric to make the foot layer. The polyester fiber is obtained from the patent with application number 2022105904295.

[0015] 5. Composite The foot-adhesive layer is bonded to the top of the foam layer to produce a PU insole.

[0016] Example 2 1. Extraction of active ingredients from Isatis indigotica root The leaves of Isatis indigotica were washed, dried, and ground into powder in a grinder. An ethanol solution was added, and the mixture was placed in an ultrasonic extraction device. The ultrasonic extraction time was controlled at 40 minutes and the extraction temperature was 46℃. The extracted solution was then filtered, evaporated, dried, and concentrated to obtain a concentrated solution. The concentrated solution was then spray-dried to obtain the active ingredients of Isatis indigotica. The mass ratio of Isatis indigotica leaf to ethanol solution is 1:12; The ethanol solution has a mass concentration of 62%. The evaporation occurs at a temperature of 48°C. The spray drying process is carried out at a temperature of 140°C.

[0017] 2. Preparation of sustained-release granules (1) Preparation of modified attapulgite soil Attapulgite was placed in a high-temperature sealed container, the container was evacuated to 0.08 MPa, and then nitrogen was introduced to a pressure of 3.0 MPa. The temperature was raised to 126°C and sealed for 26 min. Then the pressure was rapidly released and the temperature was lowered to 14°C. Deionized water, tartaric acid, polyvinylpyrrolidone and sodium alginate were added and stirred for 15 min. Then the temperature was raised to 90°C at a rate of 0.1°C / min and heat-treated at 90°C for 34 min. After drying, modified attapulgite was obtained. The attapulgite clay has a specific gravity of 2.10 and a particle size of 80 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 16:45:1.0:1.4:1.0. (2) Preparation of a solution containing active ingredients from Isatis indigotica The active ingredients of Isatis indigotica were mixed with deionized water, and the stirring temperature was controlled at 58℃ for 25 minutes. Then xanthan gum, gelatin, gum arabic and ethyl cellulose were added and mixed evenly. The mixture was then frozen at -27℃ for 30 minutes. After the freezing treatment, the mixture was allowed to return to room temperature to obtain a solution containing the active ingredients of Isatis indigotica. The mass ratio of the active ingredient of Isatis indigotica, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 8:73:1.3:1.1:1.2:0.8. (3) Mixing Modified attapulgite was mixed with a solution containing active ingredients from Isatis indigotica. After stirring evenly, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine were added. Then, two homogenization treatments were performed. The first homogenization treatment lasted for 6 minutes at a homogenization pressure of 2.5 MPa, and the second homogenization treatment lasted for 8 minutes at a homogenization pressure of 1.8 MPa. After the homogenization treatment was completed, the mixture was dried to obtain slow-release granules. The mass ratio of the modified attapulgite, the solution containing the active ingredient of Isatis indigotica, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and betaine is 2.4:16.0:1.1:1.2:2.3:0.6.

[0018] 3. Preparation of the foaming layer Polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed and the mixing temperature is controlled at 78°C. Then, additives and slow-release particles are added and stirring is continued. After stirring evenly, isocyanate is added to react and the reaction time is controlled at 1.1 h and the reaction temperature is controlled at 90°C. After the reaction is completed, a foamed layer is obtained. The polyether polyol has a molecular weight of 11,100. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release particles, and diisocyanate is 47.2:2.3:3.4:1.8:1.4:1.1:4.8:28. The preparation method of the additive is as follows: Alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 8:1, the ball milling speed at 430 rpm, the ball milling time at 26 min, and the ball milling temperature at 38℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 4:1, the ball milling speed at 200 rpm, the ball milling time at 38 min, and the ball milling temperature at 18℃. After the ball milling treatment, the mixture is placed at 1.0℃ and allowed to stand for 38 min. After standing, the mixture is dried to obtain the additive. The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 13:38:1.0:1.3.

[0019] 4. Preparation of the foot-adhesive layer Polyester fibers are spun into single yarns, twisted into yarns, and then spun into greige fabric to make the foot layer. The polyester fiber is obtained from the patent with application number 2022105904295.

[0020] 5. Composite The foot-adhesive layer is bonded to the top of the foam layer to produce a PU insole.

[0021] Example 3 1. Extraction of active ingredients from yucca Wash and dry the yucca leaves, grind them into powder in a grinder, add ethanol solution, put them into an ultrasonic extraction device, control the ultrasonic extraction time to be 50 minutes, and the extraction temperature to be 50℃. Then filter, evaporate, dry and concentrate the extracted solution to obtain a concentrated solution. Spray dry the concentrated solution to obtain the active ingredients of yucca. The mass ratio of the yucca leaves to the ethanol solution is 1:14; The ethanol solution has a mass concentration of 66%. The evaporation temperature is 52°C. The spray drying process is carried out at a temperature of 144°C.

[0022] 2. Preparation of sustained-release granules (1) Preparation of modified attapulgite soil Attapulgite was placed in a high-temperature sealed container, the container was evacuated to 0.12 MPa, and then nitrogen was introduced to a pressure of 3.4 MPa. The temperature was raised to 122°C and sealed for 30 min. Then the pressure was rapidly released and the temperature was lowered to 16°C. Deionized water, tartaric acid, polyvinylpyrrolidone and sodium alginate were added and stirred for 19 min. Then the temperature was raised to 92°C at a rate of 0.3°C / min and heat-treated at 92°C for 30 min. After drying, modified attapulgite was obtained. The attapulgite clay has a specific gravity of 2.14 and a particle size of 90 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 18:47:1.4:1.6:1.2. (2) Preparation of a solution containing the active ingredient of yucca The active ingredients of yucca were mixed with deionized water, and the stirring temperature was controlled at 62℃ for 29 minutes. Then xanthan gum, gelatin, gum arabic and ethyl cellulose were added and mixed evenly. The mixture was then frozen at -23℃ for 34 minutes. After the freezing treatment, the mixture was allowed to return to room temperature to obtain a solution containing the active ingredients of yucca. The mass ratio of the yucca active ingredient, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 12:77:1.7:1.3:1.4:1.2. (3) Mixing Modified attapulgite was mixed with a solution containing yucca active ingredients. After stirring evenly, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and betaine were added. Then, two homogenization treatments were performed. The first homogenization treatment lasted for 4 minutes and the homogenization pressure was 2.7 MPa. The second homogenization treatment lasted for 6 minutes and the homogenization pressure was 2.2 MPa. After the homogenization treatment was completed, the mixture was dried to obtain slow-release granules. The mass ratio of the modified attapulgite, the solution containing yucca active ingredients, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine is 2.6:16.6:1.3:1.6:2.7:0.8.

[0023] 3. Preparation of the foaming layer Polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed and the mixing temperature is controlled at 82℃. Then, additives and slow-release particles are added and stirring is continued. After stirring evenly, isocyanate is added to react and the reaction time is controlled at 1.3h and the reaction temperature is controlled at 94℃. After the reaction is completed, a foamed layer is obtained. The polyether polyol has a molecular weight of 11,500. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release particles, and diisocyanate is 47.8:2.7:3.6:2.2:1.6:1.3:5.4:32. The preparation method of the additive is as follows: Alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 12:1, the ball milling speed at 470 rpm, the ball milling time at 22 min, and the ball milling temperature at 43℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 8:1, the ball milling speed at 220 rpm, the ball milling time at 34 min, and the ball milling temperature at 22℃. After the ball milling treatment, the mixture is placed at 1.4℃ and allowed to stand for 42 min. After standing, the mixture is dried to obtain the additive. The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 17:46:1.4:1.7.

[0024] 4. Preparation of the foot-adhesive layer Polyester fibers are spun into single yarns, twisted into yarns, and then spun into greige fabric to make the foot layer. The polyester fiber is obtained from the patent with application number 2022105904295.

[0025] 5. Composite The foot-adhesive layer is bonded to the top of the foam layer to produce a PU insole.

[0026] Example 4 1. Extraction of active ingredients from tea leaves The tea leaves were washed, dried, and ground into powder in a grinder. An ethanol solution was added, and the mixture was placed in an ultrasonic extraction device. The ultrasonic extraction time was controlled at 42 minutes and the extraction temperature was 47°C. The extracted solution was then filtered, evaporated, dried, and concentrated to obtain a concentrated solution. The concentrated solution was then spray-dried to obtain the active ingredients of the tea leaves. The mass ratio of tea leaves to ethanol solution is 1:15; The ethanol solution has a mass concentration of 63%. The evaporation temperature is 51°C. The spray drying process is carried out at a temperature of 143°C.

[0027] 2. Preparation of sustained-release granules (1) Preparation of modified attapulgite soil Attapulgite was placed in a high-temperature sealed container, the container was evacuated to 0.14 MPa, and then nitrogen was introduced to a pressure of 3.6 MPa. The temperature was raised to 128°C and sealed for 32 min. Then the pressure was rapidly released and the temperature was lowered to 18°C. Deionized water, tartaric acid, polyvinylpyrrolidone and sodium alginate were added and stirred for 21 min. Then the temperature was raised to 93°C at a rate of 0.4°C / min and heat-treated at 93°C for 36 min. After drying, modified attapulgite was obtained. The attapulgite clay has a specific gravity of 2.16 and a particle size of 88 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 19:48:1.6:1.7:1.3. (2) Preparation of a solution containing active ingredients of tea leaves The active ingredients of tea were mixed with deionized water, and the stirring temperature was controlled at 64℃ for 31 minutes. Then xanthan gum, gelatin, gum arabic and ethyl cellulose were added and mixed evenly. The mixture was then frozen at -21℃ for 36 minutes. After the freezing treatment, the mixture was allowed to return to room temperature naturally to obtain a solution containing the active ingredients of tea. The mass ratio of the active ingredients of tea, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 11:76:1.4:1.0:1.1:1.1. (3) Mixing Modified attapulgite clay was mixed with a solution containing active ingredients of tea leaves. After stirring evenly, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and betaine were added. Then, two homogenization treatments were performed. The first homogenization treatment lasted for 7 minutes and the homogenization pressure was 2.4 MPa. The second homogenization treatment lasted for 9 minutes and the homogenization pressure was 2.1 MPa. After the homogenization treatment was completed, the slow-release granules were obtained by drying. The mass ratio of the modified attapulgite clay, the solution containing tea active ingredients, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine is 2.7:17.0:1.4:1.5:2.6:0.9.

[0028] 3. Preparation of the foaming layer Polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed and the mixing temperature is controlled at 84℃. Then, additives and slow-release particles are added and stirring is continued. After stirring evenly, isocyanate is added to react and the reaction time is controlled at 1.4h and the reaction temperature is controlled at 96℃. After the reaction is completed, a foamed layer is obtained. The polyether polyol has a molecular weight of 11,400. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release granules, and diisocyanate is 47.7:2.6:3.7:2.1:1.3:1.4:5.2:31. The preparation method of the additive is as follows: alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 6:1, the ball milling speed at 460 rpm, the ball milling time at 25 min, and the ball milling temperature at 42℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 10:1, the ball milling speed at 208 rpm, the ball milling time at 37 min, and the ball milling temperature at 24℃. After the ball milling treatment, the mixture is placed at 1.6℃ and allowed to stand for 44 min. After standing, the mixture is dried to obtain the additive. The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 19:50:1.6:1.4.

[0029] 4. Preparation of the foot-adhesive layer Polyester fibers are spun into single yarns, twisted into yarns, and then spun into greige fabric to make the foot layer. The polyester fiber is obtained from the patent with application number 2022105904295.

[0030] 5. Composite The foot-adhesive layer is bonded to the top of the foam layer to produce a PU insole.

[0031] Comparative Example 1 The changes are based on Example 1; (1) Preparation of a solution containing active ingredients of Artemisia argyi The active ingredients of Artemisia argyi were mixed with deionized water, and the stirring temperature was controlled at 60℃ for 27 minutes to obtain the product; the mass ratio of the active ingredients of Artemisia argyi to deionized water was 10:75. (2) Mixing Attapulgite clay is mixed with a solution containing active ingredients of Artemisia argyi, stirred evenly, and then dried to obtain slow-release granules. The mass ratio of the attapulgite clay to the solution containing the active ingredient of Artemisia argyi is 2.5:16.3. The attapulgite clay has a specific gravity of 2.12 and a particle size of 85 nm. All other operations are the same.

[0032] Comparative Example 2 Based on Example 1, the change is that the auxiliary components are omitted in the step of preparing the foam layer, while the rest of the operations are the same.

[0033] Performance testing 1. Antibacterial properties

[0034] 2. Odor removal performance

[0035] 3. Anti-mildew properties

[0036] 4. Basic Performance

[0037] Unless otherwise specified, all proportions mentioned in this invention are mass proportions, and all percentages are mass percentages.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A production process for antibacterial and odor-removing biofunctional PU insoles modified with plant-based active ingredients, characterized in that... The production process includes extracting plant active ingredients, preparing slow-release granules, preparing a foaming layer, preparing a foot-adhesive layer, and a composite step. The preparation of the slow-release granules includes the steps of preparing modified attapulgite, preparing a solution containing plant active ingredients, and mixing. The modified attapulgite is prepared by placing the attapulgite in a high-temperature sealed container, evacuating the container to 0.08-0.14 MPa, then filling it with nitrogen to a pressure of 3.0-3.6 MPa, raising the temperature to 122-128°C, sealing it for 26-32 minutes, then rapidly depressurizing and lowering the temperature to 14-18°C. Then, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate are added, and the mixture is stirred for 15-21 minutes. The temperature is then raised to 90-93°C at a rate of 0.1-0.4°C / min, and heat-treated at 90-93°C for 30-36 minutes. After drying, the modified attapulgite is obtained. The attapulgite clay has a specific gravity of 2.10-2.16 and a particle size of 80-90 nm. The mass ratio of attapulgite, deionized water, tartaric acid, polyvinylpyrrolidone, and sodium alginate is 16-19:45-48:1.0-1.6:1.4-1.7:1.0-1.

3. To prepare the solution containing plant active ingredients, the plant active ingredients are mixed with deionized water, the stirring temperature is controlled at 58-64℃ and the stirring time is 25-31 min, then xanthan gum, gelatin, gum arabic and ethyl cellulose are added, mixed evenly and then frozen at -27 to -21℃ for 30-36 min. After the freezing treatment, the mixture is naturally restored to room temperature to obtain the solution containing plant active ingredients. The mass ratio of the plant active ingredients, deionized water, xanthan gum, gelatin, gum arabic, and ethyl cellulose is 8-12:73-77:1.3-1.7:1.0-1.3:1.1-1.4:0.8-1.

2. To prepare the foamed layer, polyether polyol, deionized water, ethylene glycol, silicone oil, and white pigment are mixed, and the mixing temperature is controlled at 78-84℃. Then, additives and slow-release particles are added, and stirring is continued. After stirring evenly, isocyanate is added to react, and the reaction time is controlled at 1.1-1.4h and the reaction temperature is controlled at 90-96℃. After the reaction is completed, the foamed layer is obtained. The preparation method of the additive is as follows: Alumina is placed in a ball mill for a first ball milling treatment, with the ball-to-material ratio controlled at 6-12:1, the ball milling speed at 430-470 rpm, the ball milling time at 22-26 min, and the ball milling temperature at 38-43℃. Then, deionized water, xylitol, and magnesium stearate are added for a second ball milling treatment, with the ball-to-material ratio controlled at 4-10:1, the ball milling speed at 200-220 rpm, the ball milling time at 34-38 min, and the ball milling temperature at 18-24℃. After the ball milling treatment, the mixture is placed at 1.0-1.6℃ and allowed to stand for 38-44 min. After standing, the mixture is dried to obtain the additive.

2. The production process of the antibacterial and deodorizing biofunctional PU insole modified with plant active ingredients according to claim 1, characterized in that, The polyether polyol has a molecular weight of 11,100-11,500. The mass ratio of the polyether polyol, deionized water, ethylene glycol, silicone oil, white pigment, additives, slow-release particles, and diisocyanate is 47.2-47.8:2.3-2.7:3.4-3.7:1.8-2.2:1.3-1.6:1.1-1.3:4.8-5.4:28-32.

3. The production process of the antibacterial and deodorizing biofunctional PU insole modified with plant active ingredients according to claim 1, characterized in that, The mass ratio of alumina, deionized water, xylitol, and magnesium stearate is 13-19:38-50:1.0-1.6:1.3-1.

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4. The production process of the antibacterial and deodorizing biofunctional PU insole modified with plant active ingredients according to claim 1, characterized in that, The mixing process involves mixing modified attapulgite with a solution containing plant active ingredients, stirring until homogeneous, then adding mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine. The mixture is then subjected to two homogenization treatments: the first homogenization treatment lasts 4-7 minutes at a pressure of 2.4-2.7 MPa, and the second homogenization treatment lasts 6-9 minutes at a pressure of 1.8-2.2 MPa. After homogenization, the mixture is dried to obtain slow-release granules. The mass ratio of the modified attapulgite, the solution containing plant active ingredients, mannitol, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, and betaine is 2.4-2.7:16.0-16.7:1.1-1.4:1.2-1.6:2.3-2.7:0.6-0.

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5. The production process of the antibacterial and deodorizing biofunctional PU insole modified with plant active ingredients according to claim 1, characterized in that, The extraction of plant active ingredients involves washing and drying plant leaves, grinding them into powder using a grinder, adding ethanol solution, and placing the powder in an ultrasonic extraction device. The ultrasonic extraction time is controlled at 40-50 minutes and the extraction temperature at 46-50℃. The extracted solution is then filtered, evaporated, dried, and concentrated to obtain a concentrated solution. The concentrated solution is then spray-dried to obtain the plant active ingredients. The plant is one of the following: mugwort, isatis root, yucca, or tea. The mass ratio of the plant leaves to the ethanol solution is 1:12-15; The ethanol solution has a mass concentration of 62-66%; The evaporation occurs at a temperature of 48-52℃. The spray drying process is carried out at a temperature of 140-144℃.

6. The production process of the antibacterial and deodorizing biofunctional PU insole modified with plant active ingredients according to claim 1, characterized in that, The preparation of the foot-adhesive layer involves spinning polyester fibers into single yarns, twisting them into yarns, and then spinning the yarns into a fabric to obtain the foot-adhesive layer.

7. An antibacterial and odor-removing biofunctional PU insole modified with plant active ingredients, characterized in that... The insole is prepared using the manufacturing process of plant-based active ingredients modified with antibacterial and deodorizing biofunctional PU as described in any one of claims 1-6.

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