Bio-based phase change microcapsule cool blended fabric and its application in sofa cushion

Abstract

The application belongs to the technical field of functional home textiles and phase change energy storage textiles, and discloses a cool blended fabric containing bio-based phase change microcapsules and application of the cool blended fabric in sofa cushions. The fabric is prepared by using a ternary bio-based phase change material core material prepared by esterification of decanoic acid-myristic acid-palmitic acid and octadecanol, using a sodium alginate-modified starch-silicon dioxide composite system as a wall material, and using an ion crosslinking-composite coating method to prepare phase change microcapsules. The obtained microcapsules, polyamide 6, regenerated cellulose fiber and cool modified polyester are blended and woven according to a specific ratio to form a cool blended fabric, and the cool blended fabric is applied to sofa cushions and throw pillows. The application optimizes the ratio and composite process of bio-based materials, effectively improves the problem that the heat buffering time of existing cool fabrics is limited, and the obtained fabric has the advantages of good skin friendliness, significant heat buffering performance and scalable production.

Description

Technical Field

[0001] This invention relates to the field of functional home textiles and phase change energy storage textiles, specifically to a bio-based phase change microcapsule cooling blended fabric and its application in sofa cushions. Background Technology

[0002] With the improvement of people's living standards, the demand for functional home textiles is increasing. Cooling fabrics, which can quickly reduce skin contact temperature and improve comfort in summer, have become a research and development hotspot in the home textile industry. At present, cooling fabrics on the market are mainly made by using traditional phase change materials (such as single paraffin wax and industrial-grade fatty acids) combined with conventional wall materials (such as urea-formaldehyde resin and ordinary silica) to prepare microcapsules, which are then blended with fibers such as cotton and nylon.

[0003] However, existing technologies have several drawbacks: First, some phase change core materials use petroleum-based materials or industrial-grade reagents, which fall short of the skin-friendly and safe requirements for home textiles. Second, conventional wall materials have limited tolerance under mechanical washing conditions, and microcapsules are prone to rupture during fiber blending and subsequent washing, leading to core material leakage and a rapid decline in thermal buffering effect. Third, phase change microcapsules have poor compatibility with fibers, and microcapsules are prone to detachment during blending. Fourth, the phase change temperature of the phase change core material in some technical solutions does not match the range of human comfort temperature. If the phase change temperature is too low (e.g., below 20°C), the core material will have already completely melted at room temperature in summer, and will not be able to absorb heat through phase change when in contact with the human body, thus losing its thermal buffering function.

[0004] To address the shortcomings of the existing technology, this invention provides a cooling blended fabric using bio-based materials. This fabric achieves a superior thermal cushioning experience through precise control of the ternary eutectic ratio of the core material, optimization of the composite wall material ratio, and synergistic design of the fiber blending ratio, demonstrating promise for large-scale production. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, such as safety issues with cooling fabric materials, easy rupture of microcapsules, short thermal buffering time, and phase change temperature mismatch with human comfort requirements, this invention provides a cooling blended fabric containing bio-based phase change microcapsules and its application in household cushions. This invention achieves bio-based materials, mature processes, and standardized performance, ensuring that the fabric is skin-friendly and safe, has significant thermal buffering performance, and can be mass-produced, thus meeting the application needs of household cooling textiles.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] The key difference between this invention and existing technologies lies in the esterification modification of the decanoic acid-myristic acid-palmitic acid ternary eutectic mixture. The decanoic acid-myristic acid-palmitic acid ternary eutectic mixture itself has a relatively low phase transition temperature. By esterifying it with octadecyl alcohol, the phase transition temperature is raised to 28-36℃ by utilizing the principle of enhanced intermolecular forces after the introduction of ester groups, precisely matching the microenvironmental temperature range during human sitting pressure.

[0008] Furthermore, the cooling-feel modified polyester may contain conventional thermally conductive fillers, such as mica powder fillers, to further synergistically enhance the overall instantaneous cooling sensation of the fabric.

[0009] This invention provides a bio-based phase change microcapsule cooling blended fabric and its application in sofa cushions. It offers the following beneficial effects:

[0010] 1. The core material of this invention uses the esterification product of a ternary eutectic mixture of decanoic acid-myristic acid-palmitic acid and octadecyl alcohol. Through the esterification reaction, the phase change temperature is precisely controlled to 28-36℃, and the phase change enthalpy is as high as 160-270J / g. It is precisely matched with the microenvironment temperature when the human skin comes into contact with the cushion. When the human body sits on it, it can effectively trigger the solid-liquid phase change and absorb latent heat, which solves the problem of insufficient cooling effect caused by the mismatch of phase change temperature in the prior art.

[0011] 2. All materials used in this invention are bio-based and environmentally friendly. The core materials, decanoic acid, myristic acid, and palmitic acid, are all natural fatty acids that can be extracted from natural plant oils such as coconut oil and palm kernel oil; stearyl alcohol can be obtained by hydrogenating natural oils; the wall material, sodium alginate, is derived from brown algae, the modified starch is derived from plant starch, and silica is a natural mineral.

[0012] 3. The microcapsules of this invention have a particle size controlled at 1-5 μm, allowing for stable adhesion to the fiber surface. The loading process employs impregnation-drying-carding, with clear steps and controllable parameters, eliminating the need for specialized high-end equipment and enabling large-scale production.

[0013] 4. The product of this invention can be widely used in household cooling textiles such as sofa cushions, throw pillows, and backrests, which is in line with the development trend of green environmental protection and healthy home use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of the phase change microcapsules prepared in this invention;

[0015] Figure 2 This is a schematic diagram of the structure of the cooling sofa cushion for home use according to the present invention;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the cool-feeling blended fabric of the present invention;

[0017] Figure 4 This is a DSC curve of the cooling blended fabric of the present invention;

[0018] Figure 5 This is a Q-max test curve of the cool-feeling blended fabric of the present invention;

[0019] Figure 6 This is a curve showing the number of washes and the enthalpy retention rate of the cool-feeling blended fabric of the present invention.

[0020] Among them, 1. Composite wall material; 2. Phase change core material; 3. Cooling blended fabric surface layer; 4. Polyurethane foam filling layer; 5. Edge binding structure; 6. Phase change microcapsules; 7. Blended fibers; 8. Cooling yarn. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 -Appendix Figure 3 This invention provides a bio-based phase change microcapsule cooling blended fabric, comprising a composite wall material 1; a phase change core material 2; a cooling blended fabric surface layer 3; a polyurethane foam filling layer 4; an edge binding structure 5; phase change microcapsules 6; blended fibers 7; and cooling yarns 8.

[0023] The composite wall material (1) is the outer coating structure of the phase change microcapsule (6). It is formed by mixing sodium alginate, modified starch and nano silica in a set mass ratio to form a wall material dispersion system. After ion crosslinking-composite coating reaction, a stable coating layer is formed on the outside of the phase change core material to limit the leakage of phase change material and improve the mechanical stability and water washability of the microcapsule.

[0024] The phase change core material (2) is the energy storage material inside the phase change microcapsule (6). It is an esterified ternary bio-based phase change material obtained by esterification of decanoic acid, myristic acid and palmitic acid into a ternary eutectic mixture and octadecyl alcohol. Its phase change temperature is regulated to the human body's comfortable temperature range, and it is used to absorb heat and generate thermal buffer when the human body comes into contact with the cushion.

[0025] The cooling blended fabric surface layer (3) is woven from blended fibers (7) loaded with phase change microcapsules (6). The blended fibers (7) include nylon 6, regenerated cellulose fibers and cooling modified polyester. After the phase change microcapsules are attached to the fiber surface by an impregnation-puffing process, the cooling blended fabric is made by spinning and weaving processes and is used as the functional layer of the cushion that comes into direct contact with the human body.

[0026] The polyurethane foam filling layer (4) is disposed below the cool-feeling blended fabric surface layer (3), and is made of flexible polyurethane foam material. It is used to provide cushion support and resilience, and works with phase change fabric to achieve a comfortable sitting experience.

[0027] The edge-binding structure (5) is used to fix and encapsulate the cool-feeling blended fabric surface layer (3) and the polyurethane foam filling layer (4) as a whole. It can be formed by sewing or wrapping to improve the overall structural stability and durability of the cushion.

[0028] The phase change microcapsules are formed by coating a phase change core material (2) with a composite wall material (1).

[0029] The blended fiber is the base material for weaving the cool-feeling blended fabric surface layer (3).

[0030] The cooling yarn (8) is an intermediate product formed by the spinning process of blended fibers.

[0031] Example 1

[0032] The preparation of phase change microcapsules includes the following steps:

[0033] (1) Take 55g of decanoic acid, 25g of myristic acid, and 20g of palmitic acid, mix them, and place them in a 62℃ constant temperature water bath. Stir at 220r / min until completely melted to form a ternary eutectic mixture. Add 81g of octadecyl alcohol (the molar ratio of the ternary eutectic mixture to octadecyl alcohol is approximately 1:3) and 0.9g of p-toluenesulfonic acid (0.5% of the total mass of the reactants). Stir and react at 125℃ under nitrogen protection for 5h. After the reaction is complete, remove the generated water by vacuum distillation to obtain the esterified ternary phase change material. Place the esterification product in a 62℃ constant temperature water bath, add 0.9g of dispersant Tween-80, and ultrasonically disperse for 12min to form a uniform core material emulsion.

[0034] (2) Take 50g of sodium alginate, 40g of sodium carboxymethyl starch and 10g of nano silica (average particle size 30nm), mix them and add 1000g of deionized water. Stir to dissolve and then ultrasonically disperse for 22min. Adjust the pH value to 6.8 with citric acid solution to prepare a wall material dispersion.

[0035] (3) The core material emulsion was slowly added to the wall material dispersion at a rate of 1.0 mL / min, the stirring speed was controlled at 300 r / min, the temperature was raised to 52℃, 0.3 g of crosslinking agent calcium chloride was added, and the reaction was carried out for 1.8 h to form preliminary microcapsules.

[0036] (4) The reaction product was centrifuged at 3000 r / min for 10 min. The precipitate was collected, washed three times with deionized water, dried in a vacuum drying oven at 80℃ for 4 h, and cooled to room temperature to obtain phase change microcapsules.

[0037] Example 2

[0038] The preparation of cool-feeling blended fabrics includes the following steps:

[0039] (1) Take 640g of nylon, 30g of regenerated cellulose fiber and 30g of cool-feeling modified polyester (containing mica powder filler), mix them and dry them in a constant temperature oven at 50℃ for 30min to remove moisture and set aside.

[0040] (2) Take 6g of the phase change microcapsules prepared in Example 1, add 120g of deionized water, add 0.012g of dispersant Tween-80, and ultrasonically disperse for 10min to prepare a microcapsule dispersion with a concentration of 5%.

[0041] (3) The pretreated mixed fibers were immersed in the microcapsule dispersion for 25 minutes. Then, excess liquid was removed by rolling with a rolling mill to control the liquid content to 90%. The fibers were then pre-dried at 50°C until the moisture content was ≤5% to obtain the mixed fibers loaded with microcapsules.

[0042] (4) The mixed fibers loaded with microcapsules are opened, combed, drawn and spun, and the spinning speed is controlled at 20m / min and the spinning temperature is 45℃ to obtain cool yarn.

[0043] (5) The cool-feeling yarn is woven in plain weave, with a weaving density of 200 yarns / 10cm and a weaving speed of 16m / min. After weaving, it is placed in a 105℃ constant temperature oven for 6 minutes to set and produce a cool-feeling blended fabric.

[0044] The performance of the cooling blended fabric prepared in Example 2 was tested, and the results are as follows: its contact cooling coefficient Q-max reached 0.25 W / cm² (according to the aforementioned GB / T 35263 standard), and the formaldehyde content was 15 mg / kg, which is far better than the requirement of ≤75 mg / kg in GB18401 Class B standard. The results are shown in the figure below. Figure 4 , Figure 5 and Figure 6 .

[0045] Example 3

[0046] The preparation of a cooling sofa cushion for home use includes the following steps:

[0047] (1) Cut the cool-feeling blended fabric prepared in Example 2 into a size suitable for home sofas (the area of ​​a single piece is about 0.25m2).

[0048] (2) Take polyurethane foam filler (density 25kg / m3) as the filler layer.

[0049] (3) The cool-feeling blended fabric is used as the surface layer, and after being combined with the polyurethane foam filling layer, it is sewn and fixed, and the edges are bound to make a cool-feeling sofa cushion for home use.

[0050] Example 4

[0051] Comparative tests under different esterification conditions: To verify the rationality of the esterification reaction conditions of this invention, esterified ternary phase change materials were prepared under the following conditions, and their phase transition temperature and phase transition enthalpy were tested:

[0052]

[0053] Example 5

[0054] Comparative tests of different wall material ratios: To verify the rationality of the composite wall material ratios, phase change microcapsules were prepared according to the following ratios and their performance was tested:

[0055]

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bio-based phase change microcapsule cooling blended fabric, characterized in that, The product includes a cooling blended fabric surface layer (3), which is woven from a cooling yarn (8) formed by spinning blended fibers (7) loaded with phase change microcapsules (6); the phase change microcapsules (6) are formed by coating a phase change core material (2) with a composite wall material (1), and the amount of phase change microcapsules (6) added is 5%-10% of the total mass of the blended fibers (7); The phase change microcapsules (6) use an esterified ternary bio-based phase change material (2) obtained by esterification reaction of a ternary eutectic mixture of decanoic acid, myristic acid, and palmitic acid with octadecyl alcohol as the phase change core material (2), and a composite system composed of sodium alginate, modified starch, and nano silica as the composite wall material (1); the mass ratio of sodium alginate, modified starch, and nano silica is (5-6):(3-4):1, the mass ratio of the phase change core material (2) to the composite wall material (1) is 3:1-4:1, and the particle size of the phase change microcapsules (6) is 1-5μm; the blended fiber (7) is the basic material for weaving the cool-feeling blended fabric surface layer (3), which is composed of nylon 6, regenerated cellulose fiber, and cool-feeling modified polyester in a mass ratio of 4:3:

3.

2. The bio-based phase change microcapsule cooling blended fabric according to claim 1, characterized in that, In the preparation of the ternary eutectic mixture of the esterified ternary bio-based phase change material, the mass ratio of decanoic acid, myristic acid, and palmitic acid is (50-65):(20-30):(15-25); the molar ratio of the eutectic mixture to octadecyl alcohol is 1:1-1:3; the phase change temperature of the esterified ternary phase change material is 28-36℃, and the phase change enthalpy of the core material is 160-270J / g.

3. The bio-based phase change microcapsule cooling blended fabric according to claim 1, characterized in that, The modified starch is sodium carboxymethyl starch, and the average particle size of the nano-silica is 20-50 nm.

4. The bio-based phase change microcapsule cooling blended fabric according to claim 1, characterized in that, It also includes a polyurethane foam filling layer (4) and an edge-sealing structure (5); the polyurethane foam filling layer (4) is disposed below the cool-feeling blended fabric surface layer (3) and is made of flexible polyurethane foam material; the edge-sealing structure (5) is used to fix and seal the cool-feeling blended fabric surface layer (3) and the polyurethane foam filling layer (4) at the overall edge.

5. A method for preparing a bio-based phase change microcapsule cooling blended fabric according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1, Preparation of phase change microcapsules: (1) Mix decanoic acid, myristic acid, and palmitic acid in a mass ratio of (50-65):(20-30):(15-25), place them in a constant temperature water bath at 60-65℃, and stir at 200-250r / min until completely melted to form a ternary eutectic mixture; add octadecyl alcohol (the molar ratio of the ternary eutectic mixture to octadecyl alcohol is 1:1-1:3) and esterification catalyst p-toluenesulfonic acid (the amount is 0.5%-1.0% of the total mass of the reactants), and stir and react at 120-130℃ under nitrogen protection for 4-6h. After the reaction is completed, remove the generated water by vacuum distillation to obtain the esterified ternary phase change material; place the esterification product in a constant temperature water bath at 60-65℃, add 0.3-0.5% of the total mass of the esterification product of dispersant Tween-80, and ultrasonically disperse for 10-15min to form a uniform core material emulsion; (2) Sodium alginate, sodium carboxymethyl starch and nano silica are mixed in a mass ratio of (5-6):(3-4):

1. After adding deionized water and stirring to dissolve, the mixture is ultrasonically dispersed for 20-25 minutes. The pH value is adjusted to 6.5-7.0 using citric acid solution to prepare a wall material dispersion. (3) The core material emulsion is slowly added dropwise to the wall material dispersion at a rate of 0.8-1.2 mL / min, the stirring speed is controlled at 250-350 r / min, the temperature is raised to 50-55℃, and 0.2-0.4% of the total mass of the wall material is added as a crosslinking agent calcium chloride. The reaction is carried out for 1.5-2 h to achieve ionic crosslinking-composite coating. (4) Centrifuge the reaction product at a speed of 2800-3200 r / min for 8-12 min. After collecting the precipitate, wash it 2-3 times with deionized water, dry it in a vacuum drying oven at 75-85℃ for 3-5 h, and cool it to room temperature to obtain phase change microcapsules. Step 2, Pretreatment of blended fibers: Mix nylon 6, regenerated cellulose fiber, and cool-feeling modified polyester in a mass ratio of 4:3:3, place them in a constant temperature oven at 45-55℃ and dry for 25-35 minutes to remove moisture and set aside for later use. Step 3, blending: The phase change microcapsules prepared in step one are added to deionized water, and then 0.1-0.2% of the total mass of the microcapsules dispersant is added. The mixture is ultrasonically dispersed for 8-12 minutes to prepare a microcapsule dispersion with a concentration of 4-6%. The pretreated blended fibers are immersed in the microcapsule dispersion using an impregnation-pinching process for 20-30 minutes. Excess liquid is removed using a pinwheel, and the liquid content is controlled to be 80-100%. The fibers are then pre-dried at 45-55℃ until the moisture content is ≤5% to obtain the microcapsule-loaded blended fibers. Step 4, Fabric weaving: The microcapsule-loaded mixed fibers obtained in step three are opened, carded, drawn, and spun, with the spinning speed controlled at 18-22 m / min and the spinning temperature at room temperature to 50°C to produce a cooling yarn. The cooling yarn is then woven using a plain weave process, with the weaving density controlled at 190-210 threads / 10cm and the weaving speed at 14-18 m / min. After weaving, the yarn is placed in a constant temperature oven at 100-110°C for 5-8 minutes to set, thus producing a cooling blended fabric.

6. The method for preparing a bio-based phase change microcapsule cooling blended fabric according to claim 5, characterized in that, In step one, the resulting phase change microcapsules have a moisture content of ≤5% after vacuum drying.

7. The method for preparing a bio-based phase change microcapsule cooling blended fabric according to claim 5, characterized in that, In step one, the esterification catalyst is p-toluenesulfonic acid, and the amount used is 0.5%-1.0% of the total mass of the reactants; the esterification reaction temperature is 120-130℃, and the reaction time is 4-6h; in step three, the concentration of the microcapsule dispersion is 4-6%; in step four, the setting temperature is 100-110℃, and the setting time is 5-8min.

8. The application of a bio-based phase change microcapsule cooling blended fabric according to any one of claims 1-4 in sofa cushions, characterized in that, The cool blended fabric is cut into the size suitable for a domestic sofa, and is fixed by sewing after being compounded with a polyurethane foam filler, and is edge treated to make a domestic cool sofa cushion; the density of the polyurethane foam filler is 20-30kg / m 3 , and the fabric consumption of a single cushion is 0.2-0.3m 2 .

9. The application of a bio-based phase change microcapsule cooling blended fabric according to claim 8 in a sofa cushion, characterized in that, The contact cooling coefficient Q-max of the cool-feeling blended fabric is ≥0.22W / cm2, and the endothermic enthalpy of the microcapsule-containing fabric in the 28-36℃ range is ≥8J / g higher than that of the same specification fabric without microcapsules; after 10 standard water washes, the retention rate of the above endothermic enthalpy value is ≥75%.

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