Buffering and pressure-reducing sponge filling material for schoolbag straps and preparation process thereof

Abstract

The invention relates to the technical field of manufacturing of daily necessities, in particular to a buffering and pressure-reducing sponge filling material for schoolbag straps and a preparation process of the buffering and pressure-reducing sponge filling material. The preparation process comprises the following steps: preparing the composite immersion liquid immersed foamed sponge; preparing modified linen fibers; preparing a linen spacer fabric filled with foamed sponge; and preparing the buffering and pressure-reducing sponge filling material for the schoolbag straps. The linen fibers are woven into the warp-knitted spacer fabric, the foam sponge which is shrunk after being broken and absorbs water is pressed into the warp-knitted spacer fabric, then the foam sponge loses water and expands again through standing and drying, and the composite structure with the warp-knitted spacer fabric as a framework and the foam sponge as filler is manufactured in the mode. The composite structure can simultaneously have the characteristics of a sponge material and a woven material, and has good stress tensile property and pressure reduction buffer capacity when being used as a filling material of schoolbag straps.

Description

Technical Field

[0001] The invention relates to the technical field of daily necessities manufacturing, and in particular to a buffering and decompression sponge filling material for school bag straps and a preparation process thereof. Background Art

[0002] At present, students' school bags and travel backpacks are filled with many things. The school bags are too heavy, which causes problems with the user's spine and affects the height. Therefore, people have found many ways to reduce the pressure of school bags, such as making the material of the school bag straps into nylon and polyester fabrics, and widening the fabric as much as possible. The straps will deform under the weight of the school bag, distributing the pressure and preventing it from being concentrated on the shoulders; or filling the school bag straps with sponge materials. The sponge materials are compressed when they are stressed, increasing the contact area with the shoulders, achieving the ability of decompression and buffering, and can rebound when there is no gravity traction, which is more durable than nylon fabrics that are easily deformed.

[0003] Although nylon fabric has good stretchability, it is easy to deform when carrying too much weight for a long time. The tension caused by the weight of the backpack will stretch the nylon fabric and reduce its width accordingly, causing the nylon fabric to become thinner and narrower after long-term use. It is unable to distribute the pressure to reduce the pressure, but instead concentrates the pressure on the shoulders. The sponge filling material can rebound when it is not under stress, but the compression deformation of the sponge material is limited. It cannot be stretched as much as possible in the weft direction like nylon fabric to ensure the stretchability, and the pressure distribution effect is also relatively limited. Therefore, the present invention provides a buffering and decompression sponge filling material for school bag straps and a preparation process thereof, which combines the advantages of nylon fabric and sponge filling material to solve the defects of the above-mentioned prior art. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a buffering and decompression sponge filling material for school bag straps and a preparation process thereof.

[0005] A preparation process of a buffering and decompression sponge filling material for school bag straps, comprising the following steps:

[0006] S1: Preparation of composite immersion liquid for soaking foam sponge

[0007] Garcinia cambogia is crushed to obtain garcinia cambogia fine powder, the garcinia cambogia fine powder is added to ethanol for extraction to obtain garcinia cambogia extract, indigo powder and glucose are weighed and mixed to obtain a mixed powder, the mixed powder is added to ethanol for extraction to obtain a natural modified infusion, the natural modified infusion and the garcinia cambogia extract are mixed, stirred evenly to obtain a composite infusion, and then a foaming sponge is crushed and completely immersed in the composite infusion to obtain a water-soaked foaming sponge mixed solution;

[0008] S2: Preparation of modified flax fibers

[0009] The flax fiber is added to a NaOH aqueous solution and placed in a constant temperature water bath, then the flax fiber is taken out and placed in a hydrogen peroxide constant temperature water bath, finally washed with water, and dried to obtain treated flax fiber, and then the treated flax fiber is immersed in a citric acid aqueous solution and placed in a constant temperature water bath, taken out and washed with water, and dried to obtain modified flax fiber;

[0010] S3: Preparation of linen spacer fabric filled with foam sponge

[0011] The modified flax fiber is knitted into a warp knitted spacer fabric by a warp knitting machine to obtain a flax warp knitted spacer fabric, the flax warp knitted spacer fabric is cut and placed in a mixture of a foamed sponge, the filtrate is removed by pressurizing and filtering, and the filtrate is dried to obtain a flax spacer fabric filled with a foamed sponge;

[0012] S4: Preparation of cushioning and decompression sponge filling materials for backpack straps

[0013] Rosin and cardanol are mixed and heated with stirring until the product is molten, polylactic acid is added, mixed and stirred in a rotational rheometer, and then ethylenediamine solution is added dropwise, allowed to stand and cool, and evenly coated on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

[0014] Furthermore, step S1 of soaking the foaming sponge with the natural modified immersion liquid comprises the following steps:

[0015] S1.1: Grind Garcinia cambogia and dry it for 3-4 hours, pass it through a 100-mesh sieve to obtain Garcinia cambogia fine powder, add the Garcinia cambogia fine powder into 75-80% ethanol, mix the Garcinia cambogia fine powder and ethanol at a solid-liquid ratio of 1: (9-10) g / L, heat it in a water bath to 40-45°C, ultrasonically vibrate it for 30-35 minutes, cool it, centrifuge it at a speed of 8000-9000 r / min for 10-15 minutes, take the supernatant after centrifugation, and concentrate it under reduced pressure to half of the original volume to obtain Garcinia cambogia extract;

[0016] S1.2: Weigh indigo powder and glucose in a mass ratio of (5-6):(8-9) to obtain a mixed powder, add the mixed powder into ethanol in a solid-liquid ratio of 1:(25-30) g / L, heat in a microwave at 50-60°C, extract for 30-35 min, then filter to remove the residue, and obtain a natural modified infusion;

[0017] S1.3: Mix the natural modified infusion and the garcinia cambogia extract in a volume ratio of 1:(1-2), stir evenly to obtain a composite infusion, then crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the composite infusion for 3-4 hours to obtain a water-soaked foamed sponge mixture.

[0018] Furthermore, step S2 of preparing modified flax fiber comprises the following steps:

[0019] S2.1: First, the constant temperature water bath is heated to 80-90°C, and then the flax fiber is added to a 20-25wt% NaOH aqueous solution, the solid-liquid ratio of the flax fiber to the NaOH aqueous solution is 1: (3-5) g / L, and the temperature is maintained in the constant temperature water bath for 60-70 minutes, and then the flax fiber is taken out, put into 3-5% hydrogen peroxide, and then kept in a constant temperature water bath at 80-90°C for 30-35 minutes, and finally washed with water, dried, and the treated flax fiber is obtained;

[0020] S2.2: Soak the treated flax fiber in a citric acid aqueous solution and place it in a constant temperature water bath at 50-60°C for 30-35 minutes. Take it out, wash it with water, and dry it to obtain modified flax fiber.

[0021] Furthermore, step S3 prepares the linen spacer fabric filled with foamed sponge, comprising the following steps:

[0022] S3.1: The modified flax fiber is knitted into a warp knitted spacer fabric using a warp knitting machine, wherein the diameter of the spacer wire of the fabric is 65-70 μm, the thickness is 2-5 mm, the arrangement is V-shaped weaving, and the inclination angle of the spacer wire is 36-45°, to obtain a flax warp knitted spacer fabric;

[0023] S3.2: Cut the linen warp-knitted spacer fabric and place it in a mixture of soaked foam sponges. Remove the filtrate by pressurizing and filtering. Let it stand for 1-2 hours to expel bubbles. Let it stand for 24-26 hours at 40-50°C to dry, and obtain a linen spacer fabric filled with foam sponges.

[0024] Furthermore, step S4 prepares the cushioning and decompression sponge filling material for school bag straps, comprising the following steps:

[0025] S4.1: Mix rosin and cardanol in a mass ratio of 1:(9-10) and stir at 200-210°C until the product is molten, transfer to a rotational rheometer, and then add 3-4 times the mass of polylactic acid to the rotational rheometer for mixing at a temperature of 180-190°C and a rotation speed of 30-40 r / min for 5-10 minutes;

[0026] S4.2: Then raise the temperature to 200-210℃ and react for 2-2.5h. At the same time, add ethylenediamine solution to the molten material at a mass ratio of 1:(0.6-1.2) and keep stirring. Then let it stand and cool to 50-60℃. Evenly coat the material in the rotational rheometer on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

[0027] Furthermore, in step S2.2, the citric acid aqueous solution is 10-15 mg / mL.

[0028] Furthermore, the cardanol in step S4.1 is extracted from cashew nut shell liquid.

[0029] A cushioning and decompression sponge filling material for school bag straps is prepared by the preparation process of the cushioning and decompression sponge filling material for school bag straps.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] 1. The present invention weaves flax fibers into warp knitted spacer fabrics, and presses the crushed foamed sponge that absorbs water and shrinks into the warp knitted spacer fabrics, and then leaves the foamed sponge to dry so that it loses water and expands again. The interior of the foamed sponge is full of gaps and air, and has good buffering capacity. Flax is skin-friendly, breathable, and easy to dye, and is a healthy and environmentally friendly natural material. The flax warp knitted spacer fabric is more suitable for children. In addition, a composite structure with the warp knitted spacer fabric as the skeleton and the foamed sponge as the filler is made in this way. The composite structure can have the advantages of both sponge materials and woven materials. As the filling material of school bag straps, it has good stress-bearing and stretching properties and decompression and buffering capabilities. When the school bag is heavy, a certain stress-bearing and stretching capacity can cause the school bag straps to deform, thereby reducing the direct force on the shoulders, and the foam sponge filled in the linen warp-knitted spacer fabric can further buffer and disperse the pressure, reduce the local force on the shoulders, and achieve the effect of buffering and decompression. When the linen warp-knitted spacer fabric recovers, the foam sponge filled in it will not shift due to long-term pressure, thereby ensuring that the buffering and decompression performance of the school bag straps remains good during long-term use, thereby extending the service life of the product.

[0032] 2. The present invention prepares an alcohol extract of Polygonum indigofera, and prepares an immersion solution for a foam sponge together with an extract of Garcinia cambogia. Polygonum indigofera and Garcinia cambogia contain polyphenol compounds. When the foam sponge is soaked in the extract, the polyphenol compounds enter the foam sponge due to the water absorption of the foam sponge, and most of the polyphenol compounds remain in the foam sponge through the porous fluffy structure inside the foam sponge, thereby preventing the foam sponge from oxidative aging after long-term use, and extending the service life of the sponge filling material. At the same time, Garcinia cambogia also contains hydroxycitric acid. After the polyphenol compounds and hydroxycitric acid are combined, the activity of hydroxycitric acid can be improved, thereby obtaining a stronger antibacterial ability and reducing bacterial growth. In addition, Polygonum indigofera and Garcinia cambogia are both natural plant extracts, non-toxic and harmless, and meet the pursuit of environmental protection and health by modern consumers. Adding these natural ingredients to the foam sponge can improve the environmental protection and safety of the prepared sponge filling material.

[0033] 3. The present invention blends rosin, cardanol and polylactic acid, and applies them to the surface of the linen spacer fabric filled with foam sponge. Rosin is a natural resin with good adhesion properties, which can tightly adhere the foam sponge and the linen spacer fabric, thereby preventing the foam sponge from leaking out of the holes of the linen spacer fabric when the linen spacer fabric is deformed under force. Polylactic acid has a closed property and can maintain a state of being bonded to the foam sponge and the linen spacer fabric after cooling to room temperature, thereby extending the buffering and decompression capacity and service life of the sponge filling material for school bag straps; cardanol is used to bond rosin and polylactic acid to form a mutually wrapped structure, which has flow ductility. When it is coated on the surface of the linen spacer fabric filled with foam sponge, a part of it will penetrate into the interior of the linen spacer fabric and fill between the foam sponge and the linen spacer fabric, and a part of it will remain on the surface of the linen spacer fabric, so that the filled foam sponge and the linen spacer fabric form a whole with compression elasticity and stretchability under the action of the blend of rosin, cardanol and polylactic acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0035] Figure 1 This is a process flow chart for preparing the buffering and decompression sponge filling material for school bag straps used in an embodiment of the present invention.

[0036] Figure 2 The figure is a bar graph of the warp and weft crease recovery angles of the fabrics of the embodiments of the present invention and the comparative examples. DETAILED DESCRIPTION

[0037] The following is a detailed description of a cushioning and decompression sponge filling material for school bag straps and its preparation process provided by the present invention in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0038] Embodiment 1:

[0039] A preparation process of a cushioning and decompression sponge filling material for school bag straps, such as Figure 1 As shown, the following steps are included:

[0040] S1: Preparation of composite immersion liquid for soaking foam sponge

[0041] S1.1: Grind Garcinia cambogia and dry it for 3 hours, pass it through a 100-mesh sieve to obtain Garcinia cambogia fine powder, add the Garcinia cambogia fine powder into 75% ethanol, mix the Garcinia cambogia fine powder and ethanol at a solid-liquid ratio of 1:9 g / L, heat it to 40°C in a water bath, ultrasonically vibrate it for 30 minutes, cool it, centrifuge it at a speed of 8000 r / min for 10 minutes, take the supernatant after centrifugation, and concentrate it under reduced pressure to half of its original volume to obtain Garcinia cambogia extract;

[0042] S1.2: Weigh indigo powder and glucose in a mass ratio of 5:8 to obtain a mixed powder, add the mixed powder into ethanol in a solid-liquid ratio of 1:25 g / L, heat in a microwave at 50°C, extract for 30 min, and then filter to remove the residue to obtain a natural modified infusion;

[0043] S1.3: Mix the natural modified infusion and the garcinia cambogia extract in a volume ratio of 1:1, stir evenly to obtain a composite infusion, then crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the composite infusion for 3 hours to obtain a water-soaked foamed sponge mixture.

[0044] S2: Preparation of modified flax fibers

[0045] S2.1: First, the constant temperature water bath is heated to 80°C, and then the flax fiber is immersed in a 20wt% NaOH aqueous solution, with the material-liquid ratio of the flax fiber to the NaOH aqueous solution being 1:3g / L, and the temperature is maintained in the constant temperature water bath for 60 minutes, and then the flax fiber is taken out, and put into 3% hydrogen peroxide, and then kept in a constant temperature water bath at 80°C for 30 minutes, and finally washed with water, and dried to obtain the treated flax fiber;

[0046] S2.2: The treated flax fiber is then immersed in a 10 mg / mL citric acid aqueous solution and placed in a 50°C constant temperature water bath for 30 minutes. After being taken out, the fiber is washed with water and dried to obtain modified flax fiber.

[0047] S3: Preparation of linen spacer fabric filled with foam sponge

[0048] S3.1: The modified flax fiber is knitted into a warp knitted spacer fabric using a warp knitting machine, wherein the diameter of the spacer wire of the fabric is 65 μm, the thickness is 2 mm, the arrangement is V-shaped weaving, and the inclination angle of the spacer wire is 36°, thereby obtaining a flax warp knitted spacer fabric;

[0049] S3.2: Cut the linen warp-knitted spacer fabric and place it in a mixture of soaked foam sponges. Remove the filtrate by pressurizing and filtering. Let it stand for 1 hour to expel bubbles. Let it stand for 24 hours at 40°C to dry, and obtain a linen spacer fabric filled with foam sponges.

[0050] S4: Preparation of cushioning and decompression sponge filling materials for backpack straps

[0051] S4.1: Mix rosin and cardanol in a mass ratio of 1:9 and stir at 200°C until the product is molten, transfer to a rotational rheometer, and then add 3 times the mass of polylactic acid into the rotational rheometer for mixing at a temperature of 180°C and a rotation speed of 30 r / min for 5 minutes;

[0052] S4.2: Then raise the temperature to 200°C and react for 2 hours. At the same time, add ethylenediamine solution to the molten material at a mass ratio of 1:0.6 and keep stirring. Then let it stand and cool to 50°C. Evenly coat the material in the rotational rheometer on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

[0053] Embodiment 2:

[0054] A preparation process of a cushioning and decompression sponge filling material for school bag straps, such as Figure 1 As shown, the following steps are included:

[0055] S1: Preparation of composite immersion liquid for soaking foam sponge

[0056] S1.1: Grind Garcinia cambogia and dry it for 4 hours, pass it through a 100-mesh sieve to obtain Garcinia cambogia fine powder, add the Garcinia cambogia fine powder into 75% ethanol, mix the Garcinia cambogia fine powder and ethanol at a solid-liquid ratio of 1:9 g / L, heat it to 45°C in a water bath, ultrasonically vibrate it for 35 minutes, cool it, centrifuge it at a speed of 9000 r / min for 15 minutes, take the supernatant after centrifugation, and concentrate it under reduced pressure to half of the original volume to obtain Garcinia cambogia extract;

[0057] S1.2: Weigh indigo powder and glucose in a mass ratio of 5:8 to obtain a mixed powder, add the mixed powder into ethanol in a solid-liquid ratio of 1:25 g / L, heat in a microwave at 60°C, extract for 35 min, and then filter to remove the residue to obtain a natural modified infusion;

[0058] S1.3: Mix the natural modified infusion and the garcinia cambogia extract in a volume ratio of 1:1, stir evenly to obtain a composite infusion, then crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the composite infusion for 4 hours to obtain a water-soaked foamed sponge mixture.

[0059] S2: Preparation of modified flax fibers

[0060] S2.1: First, the constant temperature water bath is heated to 90°C, and then the flax fiber is immersed in a 20wt% NaOH aqueous solution, with the material-liquid ratio of the flax fiber to the NaOH aqueous solution being 1:3g / L, and the temperature is maintained in the constant temperature water bath for 70 minutes, and then the flax fiber is taken out, and put into 3% hydrogen peroxide, and then the constant temperature water bath is placed in a constant temperature water bath at 80°C for 35 minutes, and finally washed with water, and dried to obtain the treated flax fiber;

[0061] S2.2: The treated flax fiber is then immersed in a 10 mg / mL citric acid aqueous solution and placed in a 60°C constant temperature water bath for 35 minutes. After being taken out, the fiber is washed with water and dried to obtain modified flax fiber.

[0062] S3: Preparation of linen spacer fabric filled with foam sponge

[0063] S3.1: The modified flax fiber is knitted into a warp knitted spacer fabric using a warp knitting machine, wherein the diameter of the spacer wire of the fabric is 70 μm, the thickness is 5 mm, the arrangement is V-shaped weaving, and the inclination angle of the spacer wire is 45°, thereby obtaining a flax warp knitted spacer fabric;

[0064] S3.2: Cut the linen warp-knitted spacer fabric and place it in a mixture of soaked foam sponges. Remove the filtrate by pressurizing and filtering. Let it stand for 2 hours to expel bubbles. Let it stand for 26 hours at 50°C to dry, and obtain a linen spacer fabric filled with foam sponges.

[0065] S4: Preparation of cushioning and decompression sponge filling materials for backpack straps

[0066] S4.1: Mix rosin and cardanol in a mass ratio of 1:9 and stir at 210°C until the product is molten, transfer to a rotational rheometer, and then add 3 times the mass of polylactic acid to the rotational rheometer for mixing at a temperature of 190°C and a rotation speed of 40 r / min for 10 min;

[0067] S4.2: Then raise the temperature to 210°C and react for 2.5 hours. At the same time, add ethylenediamine solution to the molten material at a mass ratio of 1:0.6 and keep stirring. Then let it stand and cool to 60°C. Evenly coat the material in the rotational rheometer on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

[0068] Embodiment 3:

[0069] A preparation process of a cushioning and decompression sponge filling material for school bag straps, such as Figure 1 As shown, the following steps are included:

[0070] S1: Preparation of composite immersion liquid for soaking foam sponge

[0071] S1.1: Grind Garcinia cambogia and dry it for 3 hours, pass it through a 100-mesh sieve to obtain Garcinia cambogia fine powder, add the Garcinia cambogia fine powder into 80% ethanol, mix the Garcinia cambogia fine powder and ethanol at a solid-liquid ratio of 1:10 g / L, heat it to 40°C in a water bath, ultrasonically vibrate it for 30 minutes, cool it, centrifuge it at a speed of 8000 r / min for 10 minutes, take the supernatant after centrifugation, and concentrate it under reduced pressure to half of the original volume to obtain Garcinia cambogia extract;

[0072] S1.2: Weigh indigo powder and glucose in a mass ratio of 6:9 to obtain a mixed powder, add the mixed powder into ethanol in a solid-liquid ratio of 1:30 g / L, heat in a microwave at 50°C, extract for 30 min, and then filter to remove the residue to obtain a natural modified extract;

[0073] S1.3: Mix the natural modified infusion and the garcinia cambogia extract in a volume ratio of 1:2, stir evenly to obtain a composite infusion, then crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the composite infusion for 3 hours to obtain a water-soaked foamed sponge mixture.

[0074] S2: Preparation of modified flax fibers

[0075] S2.1: First, the constant temperature water bath is heated to 80°C, and then the flax fiber is immersed in a 25wt% NaOH aqueous solution, with the material-liquid ratio of the flax fiber to the NaOH aqueous solution being 1:5g / L, and the temperature is maintained in the constant temperature water bath for 60 minutes, and then the flax fiber is taken out, and put into 5% hydrogen peroxide, and then kept in a constant temperature water bath at 80°C for 30 minutes, and finally washed with water, and dried to obtain the treated flax fiber;

[0076] S2.2: The treated flax fiber is then immersed in a 15 mg / mL citric acid aqueous solution and placed in a 50°C constant temperature water bath for 30 minutes. After being taken out, the fiber is washed with water and dried to obtain modified flax fiber.

[0077] S3: Preparation of linen spacer fabric filled with foam sponge

[0078] S3.1: The modified flax fiber is knitted into a warp knitted spacer fabric using a warp knitting machine, wherein the diameter of the spacer wire of the fabric is 65 μm, the thickness is 2 mm, the arrangement is V-shaped weaving, and the inclination angle of the spacer wire is 36°, thereby obtaining a flax warp knitted spacer fabric;

[0079] S3.2: Cut the linen warp-knitted spacer fabric and place it in a mixture of soaked foam sponges. Remove the filtrate by pressurizing and filtering. Let it stand for 1 hour to expel bubbles. Let it stand for 24 hours at 40°C to dry, and obtain a linen spacer fabric filled with foam sponges.

[0080] S4: Preparation of cushioning and decompression sponge filling materials for backpack straps

[0081] S4.1: Mix rosin and cardanol in a mass ratio of 1:10 and stir at 200°C until the product is molten, transfer to a rotational rheometer, and then add 4 times the mass of polylactic acid into the rotational rheometer for mixing at a temperature of 180°C and a rotation speed of 30 r / min for 5 minutes;

[0082] S4.2: Then raise the temperature to 200℃ and react for 2h. At the same time, add ethylenediamine solution to the molten material at a mass ratio of 1:1.2 and keep stirring. Then let it stand and cool to 50℃. Evenly coat the material in the rotational rheometer on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

[0083] Comparative Example 1:

[0084] Comparative Example 1 is a school bag webbing made of nylon material on the market.

[0085] Comparative Example 2:

[0086] Comparative Example 2 is a backpack strap made of air cushion material on the market.

[0087] Comparative Example 3:

[0088] Comparative Example 3 is a 3D mesh backpack strap made of sponge filling material on the market.

[0089] Comparative Example 4:

[0090] Compared with Example 1, the difference of Comparative Example 4 is that step S1.2 is not performed, and in step S1.3, garcinia cambogia extract is used instead of the composite infusion liquid, specifically: "S1.3: crush the foam sponge and pass it through a 100-mesh sieve, and completely soak the crushed and sieved foam sponge in the garcinia cambogia extract for 3 hours to obtain a water-soaked foam sponge mixture", and the remaining steps remain unchanged, and a buffering and decompression sponge filling material for school bag straps is prepared, and the buffering and decompression sponge filling material for school bag straps is filled into the Oxford cloth straps to prepare school bag straps, which is recorded as Comparative Example 4.

[0091] Comparative Example 5:

[0092] Compared with Example 1, the difference of Comparative Example 5 is that step 1.1 is not performed, and a natural modified infusion is used instead of a composite infusion in step S1.3, specifically: "S1.3: Crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the natural modified infusion for 3 hours to obtain a water-soaked foamed sponge mixture", and the other steps remain unchanged, and a buffering and decompression sponge filling material for school bag straps is prepared, and the buffering and decompression sponge filling material for school bag straps is filled into an Oxford cloth strap to prepare a school bag strap, which is recorded as Comparative Example 5.

[0093] Comparative Example 6:

[0094] Compared with Example 1, the difference of Comparative Example 6 is that cardanol is not added in step S4.1, specifically: "S4: Preparation of buffering and decompression sponge filling material for school bag straps

[0095] S4.1: Stir rosin at 200°C until the product is molten, transfer it into a rotational rheometer, and then add 3 times the mass of polylactic acid into the rotational rheometer for mixing at a temperature of 180°C and a rotation speed of 30 r / min for 5 minutes;

[0096] S4.2: Then, the temperature was raised to 200°C and the reaction was carried out for 2 hours. At the same time, ethylenediamine solution was added dropwise to the molten material at a mass ratio of 1:0.6, and stirring was maintained. Then, the material was allowed to stand and cool to 50°C. The material in the rotational rheometer was evenly coated on the surface of the linen spacer fabric filled with the foamed sponge to obtain a buffering and decompression sponge filling material for school bag straps. The remaining steps remained unchanged to prepare a buffering and decompression sponge filling material for school bag straps, and the buffering and decompression sponge filling material for school bag straps was filled into the Oxford cloth straps to prepare a school bag strap, which was recorded as Comparative Example 6.

[0097] Comparative Example 7:

[0098] Compared with Example 1, the difference of Comparative Example 7 is that polylactic acid is not added in step S4.2, specifically: "S4: Preparation of cushioning and decompression sponge filling material for school bag straps

[0099] S4.1: Mix rosin and cardanol in a mass ratio of 1:9 and stir at 200°C until the product is molten, transfer to a rotational rheometer at a temperature of 180°C and a rotation speed of 30 r / min for mixing for 5 min;

[0100] S4.2: Then, the temperature was raised to 200°C and the reaction was carried out for 2 hours. At the same time, ethylenediamine solution was added dropwise to the molten material at a mass ratio of 1:0.6, and stirring was maintained. Then, the material was allowed to stand and cool to 50°C. The material in the rotational rheometer was evenly coated on the surface of the linen spacer fabric filled with the foamed sponge to obtain a buffering and decompressing sponge filling material for school bag straps. The remaining steps remained unchanged to prepare a buffering and decompressing sponge filling material for school bag straps, and the buffering and decompressing sponge filling material for school bag straps was filled into the Oxford cloth straps to prepare a school bag strap, which was recorded as Comparative Example 7.

[0101] Comparative Example 8:

[0102] Compared with Example 1, the difference of Comparative Example 8 is that no rosin is added in step S4.1, specifically: "S4: Preparation of cushioning and decompression sponge filling material for school bag straps

[0103] S4.1: Stir cardanol at 200°C and transfer it into a rotational rheometer. Then add 3 times the mass of polylactic acid into the rotational rheometer and mix at a temperature of 180°C and a rotation speed of 30 r / min for 5 minutes.

[0104] S4.2: Then, the temperature was raised to 200°C and the reaction was carried out for 2 hours. At the same time, ethylenediamine solution was added dropwise to the molten material at a mass ratio of 1:0.6, and stirring was maintained. Then, the material was allowed to stand and cool to 50°C. The material in the rotational rheometer was evenly coated on the surface of the linen spacer fabric filled with the foamed sponge to obtain a buffering and decompression sponge filling material for school bag straps. The remaining steps remained unchanged to prepare a buffering and decompression sponge filling material for school bag straps, and the buffering and decompression sponge filling material for school bag straps was filled into the Oxford cloth straps to prepare a school bag strap, which was recorded as Comparative Example 8.

[0105] The school bag straps prepared in Examples 1 to 3 were filled with the buffering and decompression sponge filling materials in the Oxford cloth straps to prepare school bag straps, which were respectively recorded as Example 1, Example 2 and Example 3.

[0106] Referring to the method recorded in GB / T 3923.1-2013 "Tensile properties of textile fabrics Part 1: Determination of breaking strength and breaking elongation (strip method)", Example 1-Example 3 and Comparative Example 1-Comparative Example 8 were tested as the tensile properties of the specimens at 500N, as shown in Table 1.

[0107] The compression deformation rate and rebound rate of the samples of Examples 1 to 3 and Comparative Examples 1 to 8 were tested according to the method recorded in GB / T 10653-2001 "Determination of compression permanent deformation of polymer porous elastic materials", as shown in Table 2.

[0108] According to GB / T 3819-1997 "Determination of Crease Recovery of Textile Fabrics - Recovery Angle Method", the crease recovery performance of the samples of Examples 1 to 3 and Comparative Examples 1 to 8 was tested. Figure 2 shown.

[0109] Table 1

[0110] Weft tensile strain (%) Example 1 67 Example 2 64 Example 3 63 Comparative Example 1 62 Comparative Example 2 43 Comparative Example 3 47 Comparative Example 4 51 Comparative Example 5 49 Comparative Example 6 40 Comparative Example 7 45 Comparative Example 8 43

[0111] Table 2

[0112] Compression set (%) Rebound rate (%) Example 1 87 98 Example 2 86 96 Example 3 84 96 Comparative Example 1 21 5 Comparative Example 2 83 89 Comparative Example 3 76 92 Comparative Example 4 73 84 Comparative Example 5 71 86 Comparative Example 6 62 81 Comparative Example 7 68 93 Comparative Example 8 66 70

[0113] The weft tensile strain rates of Examples 1 to 3 are 67%, 64% and 63%, the compression deformations are 87%, 86% and 84%, and the rebound rates are 98%, 96% and 96%. Moreover, the warp and weft recovery angles in the warp and weft crease recovery angle bar graphs of the examples all exceed those of the control examples. The weft tensile strain rate can reflect the tensile properties of the sample. The higher the tensile strain rate, the better the tensile properties. The compression deformation and rebound rate can reflect the compressive buffering capacity of the sample. The rebound rate can also reflect the durability of the sample. The warp and weft crease recovery angles are similar to the rebound rate. The larger the recovery angle, the easier it is for the sample to recover after being subjected to pressure, and the better the durability and wrinkle resistance.

[0114] The latitudinal tensile strain rate of Comparative Example 1 is 62%, and the compression deformation and rebound rate are 21% and 5% respectively. It can be seen that the nylon backpack webbing on the market has good tensile properties, but poor compressive buffering capacity, and there is almost no possibility of rebound of nylon material, so the warp and weft crease rebound angles are also very small.

[0115] The latitudinal tensile strain rates of Comparative Examples 2 and 3 are 43% and 47%, the compression deformations are 83% and 76%, and the rebound rates are 89% and 92%. It can be seen that the air cushion material and the 3D mesh of the sponge filling material have good compressive buffering capabilities, but poor tensile properties, and both the compression deformation and rebound rate as well as the warp and weft crease rebound angles are smaller than those of the embodiments. It can be seen that their compressive buffering capabilities, durability and wrinkle resistance are not as good as those of the embodiments.

[0116] The latitudinal tensile strain rates of Comparative Examples 4 and 5 are 51% and 49%, the compression deformations are 73% and 71%, and the rebound rates are 84% and 86%. It can be seen that the composite infusion of indigo and garcinia cambogia has better compressive buffering capacity and tensile properties than a single infusion. In addition, the warp and weft crease rebound angles of Comparative Examples 4 and 5 are lower than those of the embodiment. It can be seen that the composite infusion of indigo and garcinia cambogia can also bring certain durability and wrinkle resistance to the sample.

[0117] The weft tensile strain rates of Comparative Examples 6, 7 and 8 are 40%, 45% and 43%, the compression deformations are 62%, 68% and 66%, and the rebound rates are 81%, 93% and 70%. The compression deformation of Comparative Example 6 is worse than that of Comparative Examples 7 and 8, and the rebound rate is also reduced. It can be seen that the presence of cardanol allows rosin, cardanol and polylactic acid to form a mutually fused structure, which is conducive to maintaining the overall structure of the linen spacer fabric filled with foamed sponge. Therefore, when cardanol is not added, the rebound rate will decrease.

[0118] After the polylactic acid is not added to the comparative example 7, its tensile properties and resilience are worse than those of the embodiments, but the decline is lower than that of the comparative examples 6 and 8, indicating that polylactic acid also brings certain tensile and resilience capabilities to the buffering and decompression sponge filling material for school bag straps.

[0119] Comparative Example 8 is a cushioning and decompression sponge filling material for school bag straps without adding rosin, and its rebound rate is the worst among the three. The addition of rosin can bond the foam sponge and the linen spacer fabric. When there is no rosin, cardanol cannot bond the foam sponge and the linen spacer fabric, so the foam sponge and the linen spacer fabric will separate from each other, resulting in a decrease in the rebound rate. It can be seen that the combined use of rosin, cardanol and polylactic acid can improve the tensile properties and compressive buffering capacity of the sample, while the single use has a general effect, which shows that the three have a synergistic effect.

[0120] The warp and weft crease rebound angles of Comparative Examples 6-8 are also in the range of 120°-140° like Comparative Examples 2-3, indicating that their durability and wrinkle resistance are similar to those of the air cushion materials and sponge filling materials 3D mesh on the market, but lower than that of the embodiments. It can be seen that the composite use of rosin, cardanol and polylactic acid can also enhance the durability and wrinkle resistance of the sample.

[0121] 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 art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A preparation process of a cushioning and decompression sponge filling material for school bag straps, characterized in that: The steps include: S1: Preparation of composite immersion liquid for soaking foam sponge Taking garcinia cambogia and crushing it to obtain garcinia cambogia fine powder, adding the garcinia cambogia fine powder into ethanol for extraction to obtain garcinia cambogia extract, weighing indigo powder and glucose to mix to obtain mixed powder, adding ethanol to the mixed powder for extraction to obtain natural modified infusion, mixing the natural modified infusion with the garcinia cambogia extract, stirring evenly to obtain a composite infusion, then crushing the foaming sponge and completely immersing it in the composite infusion to obtain a water-soaked foaming sponge mixed solution; S2: Preparation of modified flax fibers The flax fiber is added to a NaOH aqueous solution and placed in a constant temperature water bath, then the flax fiber is taken out and placed in a hydrogen peroxide constant temperature water bath, finally washed with water, and dried to obtain treated flax fiber, and then the treated flax fiber is immersed in a citric acid aqueous solution and placed in a constant temperature water bath, taken out and washed with water, and dried to obtain modified flax fiber; S3: Preparation of linen spacer fabric filled with foam sponge The modified flax fiber is knitted into a warp knitted spacer fabric by a warp knitting machine to obtain a flax warp knitted spacer fabric, the flax warp knitted spacer fabric is cut and placed in a mixture of a foamed sponge, the filtrate is removed by pressurizing and filtering, and the filtrate is dried to obtain a flax spacer fabric filled with a foamed sponge; S4: Preparation of cushioning and decompression sponge filling materials for backpack straps Rosin and cardanol are mixed and heated with stirring until the product is molten, polylactic acid is added, mixed and stirred in a rotational rheometer, and then ethylenediamine solution is added dropwise, allowed to stand and cool, and evenly coated on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

2. The preparation process of the cushioning and decompression sponge filling material for school bag straps according to claim 1, It is characterized in that Step S1: soaking the foaming sponge with the natural modified immersion liquid, comprising the following steps: S1.1: Grind Garcinia cambogia and dry it for 3-4 hours, pass it through a 100-mesh sieve to obtain Garcinia cambogia fine powder, add the Garcinia cambogia fine powder into 75-80% ethanol, mix the Garcinia cambogia fine powder and ethanol at a solid-liquid ratio of 1: (9-10) g / L, heat it in a water bath to 40-45°C, ultrasonically vibrate it for 30-35 minutes, cool it, centrifuge it at a speed of 8000-9000 r / min for 10-15 minutes, take the supernatant after centrifugation, and concentrate it under reduced pressure to half of the original volume to obtain Garcinia cambogia extract; S1.2: Weigh indigo powder and glucose in a mass ratio of (5-6):(8-9) to obtain a mixed powder, add the mixed powder into ethanol in a solid-liquid ratio of 1:(25-30) g / L, heat in a microwave at 50-60°C, extract for 30-35 min, then filter to remove the residue, and obtain a natural modified infusion; S1.3: Mix the natural modified infusion and the garcinia cambogia extract in a volume ratio of 1:(1-2), stir evenly to obtain a composite infusion, then crush the foamed sponge and pass it through a 100-mesh sieve, and completely immerse the crushed and sieved foamed sponge in the composite infusion for 3-4 hours to obtain a water-soaked foamed sponge mixture.

3. The preparation process of a cushioning and decompression sponge filling material for school bag straps according to claim 1, characterized in that: Step S2: preparing modified flax fiber, comprising the following steps: S2.1: First, the constant temperature water bath is heated to 80-90°C, and then the flax fiber is added to a 20-25wt% NaOH aqueous solution, the solid-liquid ratio of the flax fiber to the NaOH aqueous solution is 1: (3-5) g / L, and the temperature is maintained in the constant temperature water bath for 60-70 minutes, and then the flax fiber is taken out, put into 3-5% hydrogen peroxide, and then kept in a constant temperature water bath at 80-90°C for 30-35 minutes, and finally washed with water, dried, and the treated flax fiber is obtained; S2.2: Soak the treated flax fiber in a citric acid aqueous solution and place it in a constant temperature water bath at 50-60°C for 30-35 minutes. Take it out, wash it with water, and dry it to obtain modified flax fiber.

4. The preparation process of a cushioning and decompression sponge filling material for school bag straps according to claim 3, characterized in that: Step S3: preparing a linen spacer fabric filled with a foamed sponge, comprising the following steps: S3.1: The modified flax fiber is knitted into a warp knitted spacer fabric using a warp knitting machine, wherein the diameter of the spacer wire of the fabric is 65-70 μm, the thickness is 2-5 mm, the arrangement is V-shaped weaving, and the inclination angle of the spacer wire is 36-45°, to obtain a flax warp knitted spacer fabric; S3.2: Cut the linen warp-knitted spacer fabric and place it in a mixture of soaked foam sponges. Remove the filtrate by pressurizing and filtering. Let it stand for 1-2 hours to expel bubbles. Let it stand for 24-26 hours at 40-50°C to dry, and obtain a linen spacer fabric filled with foam sponges.

5. The preparation process of a cushioning and decompression sponge filling material for school bag straps according to claim 4, characterized in that: Step S4 is to prepare a cushioning and decompression sponge filling material for school bag straps, comprising the following steps: S4.1: Mix rosin and cardanol in a mass ratio of 1:(9-10) and stir at 200-210°C until the product is molten, transfer to a rotational rheometer, and then add 3-4 times the mass of polylactic acid to the rotational rheometer for mixing at a temperature of 180-190°C and a rotation speed of 30-40 r / min for 5-10 minutes; S4.2: Then raise the temperature to 200-210℃ and react for 2-2.5h. At the same time, add ethylenediamine solution to the molten material at a mass ratio of 1:(0.6-1.2) and keep stirring. Then let it stand and cool to 50-60℃. Evenly coat the material in the rotational rheometer on the surface of the linen spacer fabric filled with foam sponge to obtain a buffering and decompression sponge filling material for school bag straps.

6. The preparation process of a cushioning and decompression sponge filling material for school bag straps according to claim 3, characterized in that: The citric acid aqueous solution in step S2.2 is 10-15 mg / mL.

7. The preparation process of a cushioning and decompression sponge filling material for school bag straps according to claim 5, characterized in that: The cardanol in step S4.1 is extracted from cashew nut shell liquid.

8. A cushioning and decompression sponge filling material for school bag straps, characterized in that: The material is prepared by the preparation process of the buffering and decompression sponge filling material for school bag straps according to any one of claims 1 to 7.

Images