A heat-accumulating thermal insulation fabric

Abstract

The application discloses a heat storage and preservation fabric, and belongs to the technical field of functional fabric, wherein the fabric is a double-layer composite structure, the inner layer is a skin-friendly layer, and the outer layer is formed by mixing hollow polyester fibers and heating fibers in a mass ratio of 2-3:3.The fabric is a double-layer structure, the inner layer is formed by weaving cotton fibers and bamboo fibers, has high skin-friendliness, air permeability, moisture permeability and natural antibacterial performance, and greatly improves the wearing comfort of the fabric; the outer layer is formed by weaving hollow polyester fibers and heating fibers, the heating fibers are uniformly dispersed with far-infrared ceramic powder, have the function of light absorption and heat generation, and cooperate with the heat preservation effect of the hollow polyester fibers, so that the fabric has excellent heat storage and preservation functions; it is further stated that the surface of the heating fiber is bonded with chitosan oligosaccharide through chemical action, and the chitosan oligosaccharide has strong fixation and washing resistance, so that the heating fiber has safe and efficient, stable and washing-resistant antibacterial performance.

Description

A heat-retaining and heat-insulating fabric Technical Field

[0001] This invention belongs to the field of functional fabric technology, specifically, it relates to a heat-retaining and heat-insulating fabric. Background Technology

[0002] To achieve effective insulation without compromising comfort by increasing the weight of clothing, heat-retaining and insulating functional fabrics are currently attracting much attention, with many companies in the industry vying to launch new insulating fabrics. The main technologies currently employed include: multi-material fiber composites, moisture-absorbing and heat-generating fibers, and the addition of far-infrared radiating materials to fibers to enhance insulation.

[0003] A Chinese patent with publication number CN1229153A provides a heat-retaining and heat-insulating fiber, its manufacturing method and application. It involves adding 0.05-20 parts of white conductive microparticles and 0.1-20 parts of white microparticles with far-infrared radiation efficiency to the fiber to form a polymer, thereby obtaining a mixed composition. The mixed composition is then melt-spun using an extruder to extend it into a long or short heat-retaining and heat-insulating fiber.

[0004] The existing technical solutions mentioned above have the following drawbacks: 1. Various microparticles are inorganic materials, which have interfacial compatibility issues with the polymer matrix, making them prone to agglomeration and affecting the heating effect; 2. The comfort and skin-friendliness of the fabric woven from the above-mentioned heat-storing and heat-insulating fibers are easily overlooked in order to reflect its heat-storing and heat-insulating effect, and therefore need to be improved; 3. After the fabric has a heat-storing function, it is easy for bacteria to grow in a humid environment, which also needs further improvement. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat-retaining and heat-insulating fabric.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A heat-retaining and heat-insulating fabric has a double-layer composite structure. The inner layer is a skin-friendly layer, which is made of cotton fiber and bamboo fiber blended in a mass ratio of 2:1-2. Cotton fiber and bamboo fiber have high skin-friendly, breathable and moisture-wicking properties. The blending of the two as the inner layer makes the fabric skin-friendly and breathable and moisture-wicking. In addition, bamboo fiber has natural antibacterial, bacteriostatic and mite-removing effects, which can improve the defect of breathable fabrics that are prone to bacterial growth.

[0008] The outer layer is made of hollow polyester fiber and heat-generating fiber blended in a mass ratio of 2-3:3. Hollow fiber is an important type of shaped fiber with a cavity along the axial direction in its cross-section. The hollow structure gives the fiber good warmth retention, fluffiness and other properties. In addition, after the heat-generating fiber absorbs heat and causes the fabric temperature to rise, the hollow fiber can play a better role in heat storage and insulation.

[0009] Furthermore, the heating fiber is prepared by the following steps:

[0010] S1. Dilute the self-crosslinking acrylate emulsion with deionized water and place it in a stirring container. Turn on the stirrer and maintain the speed at 600-700 r / min. Slowly add the far-infrared ceramic micro powder. After adding all the powder, continue stirring for 60-90 min. Then transfer the mixture to a sand mill for sand milling at a temperature of 35-45℃. Repeat the sand milling process 3-5 times. After sand milling, evaporate the solvent (water) under heating to remove the powder, thus completing the pretreatment of the ceramic micro powder. The self-crosslinking acrylate emulsion is a self-crosslinking acrylate emulsion with hydroxyl and carboxyl groups and a solid content of 30%. The ratio of far-infrared ceramic micro powder to self-crosslinking acrylate emulsion is 1 g: 40 mL.

[0011] Slowly adding far-infrared ceramic micropowder under stirring not only reduces agglomeration but also allows the acrylate emulsion to wet the micropowder particles as much as possible (the self-crosslinked acrylate emulsion contains -OH, -COOH and other groups, which form hydrogen bonds with the -OH on the surface of the far-infrared ceramic micropowder). After the micropowder particles are wetted, the acrylate emulsion completes self-crosslinking on the particle surface, generating an acrylate polymer with macromolecular steric hindrance effect. This not only effectively improves the interfacial compatibility between the ceramic micropowder and the polyacrylonitrile polymer during melt spinning and promotes their dispersion, but also stabilizes the particles.

[0012] S2. Polyacrylonitrile is mixed with pretreated ceramic micro powder and melt-spun to obtain polyacrylonitrile fiber; the pretreated ceramic micro powder accounts for 5-7% of the mass of polyacrylonitrile.

[0013] S3. Add the dried polyacrylonitrile fiber and a 15% (w / w) hydrazine hydrate solution to a three-necked flask, purge with nitrogen for protection, heat to reflux, and after reflux reaction for 5 hours, stop heating, cool to room temperature, filter, and wash 5-6 times with distilled water. Then place in a vacuum drying oven at 75℃ and dry to constant weight to obtain pre-modified fiber; the solid-liquid ratio of polyacrylonitrile fiber to hydrazine hydrate solution is 1 g: 100 mL.

[0014] S4. Add the pre-modified fiber and NaOH aqueous solution (10% by mass) to a three-necked flask, heat under reflux for 2-3 hours. After the reaction is complete, wash with water until neutral, then immerse in acetic acid aqueous solution (10% by mass), shake for 1 hour, wash with water, and dry to obtain carboxylated polyacrylonitrile fiber; the solid-liquid ratio of the pre-modified fiber and NaOH aqueous solution is 1 g: 100 mL.

[0015] The -CN on the polyacrylonitrile fiber molecular chain is transformed into -COOH functional groups through hydrazine hydrate treatment, alkaline hydrolysis, and acetic acid acidification, laying the reaction sites for subsequent modification.

[0016] S5. Dissolve chitosan oligosaccharide in water to form a solution with a mass fraction of 8%, add EDC·HCl (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, carboxyl activator), stir to dissolve evenly, then add carboxylated polyacrylonitrile fiber at a solid-liquid ratio of 1g:50mL, shake for 2 hours, wash with water and dry to obtain heating fiber.

[0017] Under the action of EDC·HCl, the -COOH on the surface of carboxylated polyacrylonitrile fiber and the -NH2 on the chitosan oligosaccharide molecule are easily amidated, so that the chitosan oligosaccharide is adsorbed on the fiber surface through chemical bonds, with strong fixation and water resistance. Chitosan oligosaccharide can effectively inhibit the growth and reproduction of bacteria and fungi. Compared with general antibacterial agents, it has the advantages of high antibacterial activity, broad-spectrum antibacterial and safe and harmless, thus giving the heating fiber safe, efficient, stable and washable antibacterial properties.

[0018] In addition, far-infrared ceramic powder is evenly dispersed in polyacrylonitrile fibers, which can absorb light and generate heat. Combined with the heat-insulating effect of hollow polyester fibers, the fabric can perform the function of heat storage and insulation.

[0019] The beneficial effects of this invention are:

[0020] The fabric of this invention has a double-layer structure. The inner layer is woven from cotton and bamboo fibers, which has high skin-friendliness, breathability, moisture permeability, and natural antibacterial properties, greatly improving the wearing comfort of the fabric. The outer layer is woven from hollow polyester fibers and heat-generating fibers. Far-infrared ceramic powder is evenly dispersed in the heat-generating fibers, which has the function of absorbing light and generating heat. Combined with the heat-insulating effect of hollow polyester fibers, the fabric has excellent heat storage and heat preservation functions. It should be further noted that the surface of the heat-generating fibers is chemically bonded with chitosan oligosaccharides, and the chitosan oligosaccharides have strong fixation and are washable, giving the heat-generating fibers safe, efficient, stable, and washable antibacterial properties. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Preparation of heating fibers:

[0024] S1. Dilute 400mL of self-crosslinking acrylate emulsion with 500mL of deionized water and place it in a stirring container. Turn on the stirring and keep the speed at 600r / min. Slowly add 10g of far-infrared ceramic micro powder. After adding the powder, continue stirring for 60min. Then transfer the powder to a sand mill for sand milling at 35℃. Repeat the sand milling process 3 times. After the sand milling is completed, evaporate the solvent (water) under heating to remove the powder and complete the pretreatment of the ceramic micro powder.

[0025] S2. Mix 100g of polyacrylonitrile with 5g of pretreated ceramic micro powder, and obtain polyacrylonitrile fiber by melt spinning.

[0026] S3. Add 10g of dried polyacrylonitrile fiber and 1L of 15% hydrazine hydrate solution to a three-necked flask, purge with nitrogen for protection, heat to reflux, reflux for 5 hours, stop heating, cool to room temperature, filter and wash 5 times with distilled water, then place in a vacuum drying oven at 75℃ and dry to constant weight to obtain pre-modified fiber.

[0027] S4. Add 10g of pre-modified fiber and 1L of NaOH aqueous solution (mass fraction 10%) to a three-necked flask, heat under reflux for 2h, after the reaction is complete, wash with water until neutral, then immerse in acetic acid aqueous solution (mass fraction 10%), shake for 1h, wash with water and dry to obtain carboxylated polyacrylonitrile fiber.

[0028] S5. Dissolve 40g of chitosan oligosaccharide in 460g of water, add 0.2g of EDC·HCl, stir and dissolve evenly, add 10g of carboxylated polyacrylonitrile fiber to the above 500mL solution, shake for 2h, wash with water and dry to obtain heating fiber.

[0029] Example 2

[0030] Preparation of heating fibers:

[0031] S1. Dilute 400mL of self-crosslinking acrylate emulsion with 500mL of deionized water and place it in a stirring container. Turn on the stirring and keep the speed at 650r / min. Slowly add 10g of far-infrared ceramic micro powder. After adding the powder, continue stirring for 75min. Then transfer the powder to a sand mill for sand milling at 40℃. Repeat the sand milling process 4 times. After sand milling, evaporate the solvent (water) under heating to remove the powder and complete the pretreatment of the ceramic micro powder.

[0032] S2. Mix 100g of polyacrylonitrile with 6g of pretreated ceramic micro powder, and obtain polyacrylonitrile fiber by melt spinning.

[0033] S3. Add 10g of dried polyacrylonitrile fiber and 1L of 15% hydrazine hydrate solution to a three-necked flask, purge with nitrogen for protection, heat to reflux, reflux for 5h, stop heating, cool to room temperature, filter and wash 6 times with distilled water, then place in a vacuum drying oven at 75℃ and dry to constant weight to obtain pre-modified fiber.

[0034] S4. Add 10g of pre-modified fiber and 1L of NaOH aqueous solution (mass fraction 10%) to a three-necked flask, heat under reflux for 2.5h, after the reaction is complete, wash with water until neutral, then immerse in acetic acid aqueous solution (mass fraction 10%), shake for 1h, wash with water and dry to obtain carboxylated polyacrylonitrile fiber.

[0035] S5. Dissolve 40g of chitosan oligosaccharide in 460g of water, add 0.2g of EDC·HCl, stir and dissolve evenly, add 10g of carboxylated polyacrylonitrile fiber to the above 500mL solution, shake for 2h, wash with water and dry to obtain heating fiber.

[0036] Example 3

[0037] Preparation of heating fibers:

[0038] S1. Dilute 400mL of self-crosslinking acrylate emulsion with 500mL of deionized water and place it in a stirring container. Turn on the stirring and keep the speed at 700r / min. Slowly add 10g of far-infrared ceramic micro powder. After adding the powder, continue stirring for 90min. Then transfer the powder to a sand mill for sand milling at 45℃. Repeat the sand milling process 5 times. After sand milling, evaporate the solvent (water) under heating to remove the powder and complete the pretreatment of the ceramic micro powder.

[0039] S2. Mix 100g of polyacrylonitrile with 7g of pretreated ceramic micro powder, and obtain polyacrylonitrile fiber by melt spinning.

[0040] S3. Add 10g of dried polyacrylonitrile fiber and 1L of 15% hydrazine hydrate solution to a three-necked flask, purge with nitrogen for protection, heat to reflux, reflux for 5h, stop heating, cool to room temperature, filter and wash 6 times with distilled water, then place in a vacuum drying oven at 75℃ and dry to constant weight to obtain pre-modified fiber.

[0041] S4. Add 10g of pre-modified fiber and 1L of NaOH aqueous solution (mass fraction 10%) to a three-necked flask, heat under reflux for 3h, wash with water until neutral after the reaction is complete, then immerse in acetic acid aqueous solution (mass fraction 10%), shake for 1h, wash with water and dry to obtain carboxylated polyacrylonitrile fiber.

[0042] S5. Dissolve 40g of chitosan oligosaccharide in 460g of water, add 0.2g of EDC·HCl, stir and dissolve evenly, add 10g of carboxylated polyacrylonitrile fiber to the above 500mL solution, shake for 2h, wash with water and dry to obtain heating fiber.

[0043] Example 4

[0044] The inner layer is obtained by blending cotton fiber and bamboo fiber in a mass ratio of 2:1.

[0045] Hollow polyester fibers and the heating fibers prepared in Example 1 were blended and woven at a mass ratio of 2:3 to obtain the outer layer;

[0046] The inner and outer layers are hot-pressed together using polyamide hot melt adhesive to obtain a heat-retaining and warm fabric.

[0047] Example 5

[0048] The inner layer is obtained by blending cotton fiber and bamboo fiber in a mass ratio of 2:1.5.

[0049] Hollow polyester fibers and the heating fibers prepared in Example 2 were blended and woven at a mass ratio of 2.5:3 to obtain the outer layer;

[0050] The inner and outer layers are hot-pressed together using polyamide hot melt adhesive to obtain a heat-retaining and warm fabric.

[0051] Example 6

[0052] The inner layer is obtained by blending cotton fiber and bamboo fiber in a 1:1 mass ratio.

[0053] Hollow polyester fibers and the heating fibers prepared in Example 3 were blended and woven in a 1:1 mass ratio to obtain the outer layer.

[0054] The inner and outer layers are hot-pressed together using polyamide hot melt adhesive to obtain a heat-retaining and warm fabric.

[0055] The fabrics obtained in Examples 4-6 were cut into test samples and subjected to the following performance tests:

[0056] The moisture permeability was tested according to GB / T 12704-2009 "Textiles - Test methods for moisture permeability - Part 1: Moisture absorption method";

[0057] The air permeability was tested according to GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics";

[0058] The antibacterial rate (%) of the fabric was tested according to GB / T20944.2-2007 "Evaluation of antimicrobial properties of textiles - Part 2: Absorption method" (the tested bacteria were Escherichia coli).

[0059] The test sample was irradiated with a 500W infrared lamp under the same conditions for 10 minutes, and the temperature change was measured. After the infrared irradiation was removed, the temperature change was measured after 20 minutes. (+ indicates that the temperature of the fabric increased compared to the original temperature.)

[0060] The measured results are shown in the table below:

[0061]

[0062]

[0063] As can be seen from the data in the table above, the fabric obtained by this invention has excellent infrared heating and heat storage functions; it also has high breathability, moisture permeability and antibacterial properties, and has significant commercial value.

[0064] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A heat-storing and heat-insulating fabric, characterized in that, It has a double-layer composite structure, with an inner skin-friendly layer and an outer layer made of hollow polyester fiber and heating fiber blended in a mass ratio of 2-3:

3. The heating fiber is prepared through the following steps: S1. Dilute the self-crosslinking acrylate emulsion with deionized water and place it in a stirring container. Start stirring and maintain the speed at 600-700 r / min. Slowly add far-infrared ceramic micropowder. After adding, continue stirring for 60-90 min, then transfer to a sand mill for sand milling at a temperature of 35-45℃. Repeat the sand milling 3-5 times. After sand milling, evaporate the solvent under heating to complete the pretreatment of the ceramic micropowder; S2. Mix polyacrylonitrile with the pretreated ceramic micropowder and melt spin to obtain polyacrylonitrile fiber; S3. Mix the dried polyacrylonitrile fiber with a mass fraction of... A 15% hydrazine hydrate solution was added to a three-necked flask, protected with nitrogen, and heated to reflux. After reflux for 5 hours, heating was stopped, and the mixture was cooled to room temperature. The flask was then filtered and washed 5-6 times with distilled water. Finally, it was dried in a vacuum drying oven at 75°C to constant weight to obtain pre-modified fibers. S4. The pre-modified fibers and NaOH aqueous solution were added to a three-necked flask and heated to reflux for 2-3 hours. After the reaction was complete, the fibers were washed with water until neutral, then immersed in an acetic acid aqueous solution and shaken for 1 hour. After washing and drying, carboxylated polyacrylonitrile fibers were obtained. S5. Chitosan oligosaccharide was dissolved in water to form an 8% (w / w) solution. EDC·HCl was added and stirred until dissolved. The carboxylated polyacrylonitrile fibers were then added at a solid-liquid ratio of 1 g: 50 mL. After shaking for 2 hours, the fibers were washed and dried to obtain heat-generating fibers.

2. The heat-storing and heat-insulating fabric according to claim 1, characterized in that, In step S1, the ratio of far-infrared ceramic micro powder to self-crosslinking acrylate emulsion is 1g:40mL.

3. The heat-storing and heat-insulating fabric according to claim 1, characterized in that, In step S2, the pretreated ceramic powder accounts for 5-7% of the mass of polyacrylonitrile.

4. The heat-storing and heat-insulating fabric according to claim 1, characterized in that, In step S3, the solid-liquid ratio of polyacrylonitrile fiber and hydrazine hydrate solution is 1g:100mL.

5. The heat-storing and heat-insulating fabric according to claim 1, characterized in that, In step S4, the ratio of pre-modified fiber to NaOH aqueous solution is 1g:100mL.

6. The heat-storing and heat-insulating fabric according to claim 1, characterized in that, The inner layer is made of cotton fiber and bamboo fiber blended in a mass ratio of 2:1-2.

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