A far-infrared heat-retaining knitted fabric for down jackets and its preparation method

Abstract

This invention relates to a far-infrared heat-retaining knitted fabric for down jackets and its preparation method. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are obtained by uniformly mixing 80-100 parts of polyester masterbatch, 20-30 parts of far-infrared masterbatch, and 1-5 parts of antibacterial particles, followed by melt extrusion granulation and then melt spinning. The far-infrared masterbatch is obtained by mixing mineral powder with molten salt, subjecting it to high-temperature activation, then using propylene glycol as a solvent, with the activated mineral powder as the main material, adding dispersing agents, and dispersing evenly to obtain a slurry. Finally, the slurry is uniformly mixed with polyester resin, concentrated, melted, and granulated. This invention uses the high-temperature activation treatment after mixing mineral powder and molten salt, and applies the activated mineral powder to the preparation process of far-infrared fibers. The two synergistically promote each other, enabling the fabric to have both light absorption and heat storage properties and far-infrared properties, further improving the overall heat retention performance of the fabric.

Description

Technical Field

[0001] This invention belongs to the field of down jacket fabric technology, specifically relating to a far-infrared heat-retaining knitted fabric for down jackets and its preparation method. Background Technology

[0002] Currently, there are many types of thermal insulation fibers on the market, generally achieved through two methods: The first method involves adding a suitable amount of light-absorbing and heat-retaining microparticles that can convert sunlight into far-infrared rays into the fiber during the spinning process, resulting in light-absorbing and heat-retaining fibers that achieve a warming effect through light absorption and heat storage. The second method involves adding a suitable amount of far-infrared microparticles that radiate far-infrared rays and are close to human body temperature into the fiber during the spinning process, resulting in far-infrared fibers that provide warmth through far-infrared properties. The first method provides good heat storage and insulation under sunlight or hot light sources, but its insulation effect is not significant under cold light sources. The fibers or fabrics obtained through the second method can radiate far-infrared rays at temperatures close to human body temperature, thus possessing certain heat storage and insulation properties, suitable for indoor use. However, their insulation performance is not up to standard when outdoors in cold winters.

[0003] As the functionality of textile fabrics continues to advance, fiber fabrics with only a single warmth-retaining effect can hardly meet the needs of consumers. This also puts forward higher requirements for the textile industry. Therefore, how to make the fabric take into account both light absorption and heat storage properties and far-infrared properties, and improve the overall warmth-retaining performance of the fabric, is a technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a far-infrared heat-retaining knitted fabric for down jackets and its preparation method in order to solve the above-mentioned problems, thereby addressing the shortcomings of the prior art.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] As a first aspect of the present invention, the present invention provides a far-infrared heat-retaining knitted fabric for down jackets, the knitted fabric comprising far-infrared heat-retaining fibers, wherein the far-infrared heat-retaining fibers, by weight, are obtained by uniformly mixing 80-100 parts of polyester masterbatch, 20-30 parts of far-infrared masterbatch and 1-5 parts of antibacterial particles, first by melt extrusion granulation and then by melt spinning.

[0007] The far-infrared masterbatch is obtained by mixing ore powder with molten salt, first activating it at high temperature, then using propylene glycol as solvent, with the activated ore powder as the main material, adding dispersing aids, dispersing evenly to obtain a slurry, and finally mixing the slurry with polyester resin evenly, followed by concentration, melting, and granulation.

[0008] As a further optimization of the present invention, the high-temperature activation treatment is 220-250℃, and the activation time is 3-5h.

[0009] As a further optimization of the present invention, the ore powder is one of germanium stone powder, volcanic rock powder or selenium ore powder, and the molten salt is a binary molten salt, comprising 60% sodium nitrate and 40% potassium nitrate by mass percentage.

[0010] As a further optimization of the present invention, the mass ratio of the ore powder to the molten salt is 10-20:1, and the mass ratio of the ore powder to the polyester resin is 20-50:100.

[0011] As a further optimization of the present invention, the dispersing agent is water glass and sodium dodecyl sulfate, and the mass ratio of propylene glycol, water glass and sodium dodecyl sulfate is 1-2:2-3:1-5.

[0012] As a further optimization of the present invention, the antibacterial particles are nano zinc oxide or nano silver oxide.

[0013] As a second aspect of the present invention, the present invention also provides a method for preparing far-infrared heat-retaining knitted fabric for down jackets, comprising the following steps:

[0014] (1) After mixing the ore powder with molten salt, the mixture is first activated at high temperature. Then, using propylene glycol as solvent, the activated ore powder is used as the main material, and a dispersing agent is added to disperse it evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin, and then concentrated, melted, and granulated to obtain far-infrared masterbatch.

[0015] (2) According to the weight parts, 80-100 parts of polyester masterbatch, 20-30 parts of far-infrared masterbatch obtained in step (1) and 1-5 parts of antibacterial particles are first melt-extruded and granulated, and then melt-spun to obtain far-infrared heat storage fiber.

[0016] (3) The far-infrared heat storage fiber obtained in step (2) is woven into the far-infrared heat storage knitted fabric for down clothing.

[0017] As a further optimization of the present invention, in step (2), the spinneret of melt spinning has 32-35 round holes with a diameter of 0.4-0.6 mm; the winding speed is 800-1000 m / min and the melt index is 35-40 g / 10 min.

[0018] The beneficial effects of this invention are as follows:

[0019] The far-infrared masterbatch provided by this invention is made by mixing mineral powder with molten salt, first activating it at high temperature, then using propylene glycol as a solvent, with the activated mineral powder as the main material, adding dispersing agents, and dispersing evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin, and then concentrated, melted, and granulated to obtain the final product. This invention allows mineral powder and molten salt to be mixed and activated at high temperature, and then the activated mineral powder is applied to the preparation process of far-infrared fibers. The two work synergistically to promote each other, so that the fabric can take into account both light absorption and heat storage properties and far-infrared properties, and the overall heat preservation performance of the fabric is further improved. Detailed Implementation

[0020] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1

[0022] This embodiment provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are made by uniformly mixing 80 parts of polyester masterbatch, 30 parts of far-infrared masterbatch, and 5 parts of nano zinc oxide, first by melt extrusion granulation, and then by melt spinning.

[0023] The preparation method of far-infrared heat-retaining knitted fabric for down jackets includes the following steps:

[0024] (1) After mixing germanium stone powder with molten salt, the mixture is activated at 250°C for 3 hours. Then, using propylene glycol as solvent, water glass and sodium dodecyl sulfate are added as the main material and dispersed evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin and then concentrated, melted, and granulated by a granulator to obtain far-infrared masterbatch. The molten salt is a binary molten salt (60% sodium nitrate + 40% potassium nitrate by mass percentage). The mass ratio of germanium stone powder to molten salt is 10:1. The mass ratio of germanium stone powder to polyester resin is 50:100. The mass ratio of propylene glycol, water glass and sodium dodecyl sulfate is 1:3:1.

[0025] (2) According to the weight parts, 80 parts of polyester masterbatch, 30 parts of far-infrared masterbatch and 5 parts of nano zinc oxide are mixed evenly, first melt extruded and granulated, and then melt spun to obtain far-infrared heat storage fiber. The spinneret of melt spinning has 32 round holes with a diameter of 0.4 mm; the winding speed is 800 m / min and the melt index is 35 g / 10 min.

[0026] (3) The far-infrared heat storage fiber obtained in step (2) is woven into the far-infrared heat storage knitted fabric for the down jacket using a knitting machine.

[0027] Example 2

[0028] This embodiment provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are made by mixing 100 parts of polyester masterbatch, 20 parts of far-infrared masterbatch and 1 part of nano silver oxide evenly, first by melt extrusion granulation, and then by melt spinning.

[0029] The preparation method of far-infrared heat-retaining knitted fabric for down jackets includes the following steps:

[0030] (1) Volcanic rock powder and molten salt are mixed and activated at 200°C for 5 hours. Then, propylene glycol is used as solvent, and the activated volcanic rock powder is added as the main material. Water glass and sodium dodecyl sulfate are added and dispersed evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin, and then concentrated, melted and granulated by a granulator to obtain far-infrared masterbatch. The molten salt is a binary molten salt (60% sodium nitrate + 40% potassium nitrate by mass percentage). The mass ratio of volcanic rock powder to molten salt is 20:1. The mass ratio of volcanic rock powder to polyester resin is 20:100. The mass ratio of propylene glycol, water glass and sodium dodecyl sulfate is 2:2:5.

[0031] (2) According to the weight parts, 100 parts of polyester masterbatch, 20 parts of far-infrared masterbatch and 1 part of nano silver oxide are mixed evenly, first melt extruded and granulated, and then melt spun to obtain far-infrared heat storage fiber. The spinneret of melt spinning has 35 round holes with a diameter of 0.6 mm; the winding speed is 1000 m / min and the melt index is 40 g / 10 min.

[0032] (3) The far-infrared heat storage fiber obtained in step (2) is woven into the far-infrared heat storage knitted fabric for the down jacket using a knitting machine.

[0033] Example 3

[0034] This embodiment provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are made by uniformly mixing 90 parts of polyester masterbatch, 25 parts of far-infrared masterbatch, and 3 parts of nano silver oxide, first by melt extrusion granulation, and then by melt spinning.

[0035] The preparation method of far-infrared heat-retaining knitted fabric for down jackets includes the following steps:

[0036] (1) Selenium ore powder and molten salt are mixed and activated at 220°C for 3 hours. Then, using propylene glycol as solvent, the activated selenium ore powder is added as the main material, along with water glass and sodium dodecyl sulfate, and the mixture is dispersed evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin, and then concentrated, melted, and granulated by a granulator to obtain far-infrared masterbatch. The molten salt is a binary molten salt (60% sodium nitrate + 40% potassium nitrate by mass percentage). The mass ratio of selenium ore powder to molten salt is 15:1, the mass ratio of selenium ore powder to polyester resin is 35:100, and the mass ratio of propylene glycol, water glass, and sodium dodecyl sulfate is 2:2:1.

[0037] (2) According to the weight parts, 90 parts of polyester masterbatch, 25 parts of far-infrared masterbatch and 3 parts of nano silver oxide are mixed evenly, first melt extruded and granulated, and then melt spun to obtain far-infrared heat storage fiber. The spinneret of melt spinning has 35 round holes with a diameter of 0.5 mm; the winding speed is 900 m / min and the melt index is 40 g / 10 min.

[0038] (3) The far-infrared heat storage fiber obtained in step (2) is woven into the far-infrared heat storage knitted fabric for the down jacket using a knitting machine.

[0039] Comparative Example 1

[0040] This comparative example provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are obtained by uniformly mixing 90 parts of polyester masterbatch, 25 parts of far-infrared masterbatch, and 3 parts of nano silver oxide, first by melt extrusion granulation, and then by melt spinning.

[0041] The preparation method of far-infrared heat-storing knitted fabric for down jackets is the same as in Example 2, except that in step (1), the far-infrared masterbatch is prepared by activating volcanic rock powder at 200°C for 5 hours, then using propylene glycol as solvent, adding water glass and sodium dodecyl sulfate as the main material, dispersing evenly to obtain a slurry, and finally mixing the slurry with polyester resin evenly, and then concentrating, melting and granulating to obtain the slurry.

[0042] Comparative Example 2

[0043] This comparative example provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are obtained by uniformly mixing 90 parts of polyester masterbatch, 25 parts of far-infrared masterbatch, and 3 parts of nano silver oxide, first by melt extrusion granulation, and then by melt spinning.

[0044] The preparation method of far-infrared heat-storing knitted fabric for down jackets, except that in step (1), the far-infrared masterbatch is obtained by mixing volcanic rock powder with molten salt, using propylene glycol as solvent, and using activated volcanic rock powder as the main material, adding water glass and sodium dodecyl sulfate, dispersing evenly to obtain a slurry, and finally mixing the slurry with polyester resin evenly, and then concentrating, melting, and granulating, the molten salt is a binary molten salt (by mass percentage, 60% sodium nitrate + 40% potassium nitrate), the mass ratio of volcanic rock powder to molten salt, the mass ratio of volcanic rock powder to polyester resin, the mass ratio of propylene glycol, water glass and sodium dodecyl sulfate, and other preparation steps are the same as in Example 2.

[0045] Comparative Example 3

[0046] This comparative example provides a far-infrared heat-retaining knitted fabric for down jackets. The knitted fabric includes far-infrared heat-retaining fibers. The far-infrared heat-retaining fibers, by weight, are obtained by uniformly mixing 90 parts of polyester masterbatch, 25 parts of far-infrared masterbatch, and 3 parts of nano silver oxide, first by melt extrusion granulation, and then by melt spinning.

[0047] The preparation method of far-infrared heat-storing knitted fabric for down jackets, except that in step (1), the far-infrared masterbatch is obtained by mixing volcanic rock powder with sodium chloride, then using propylene glycol as a solvent, with activated volcanic rock powder as the main material, adding water glass and sodium dodecyl sulfate, dispersing evenly to obtain a slurry, and finally mixing the slurry with polyester resin evenly, and then concentrating, melting, and granulating, the mass ratio of volcanic rock powder to sodium chloride, the mass ratio of volcanic rock powder to polyester resin, the mass ratio of propylene glycol, water glass and sodium dodecyl sulfate, and other preparation steps are the same as in Example 2.

[0048] The far-infrared properties of the knitted fabric samples prepared in Examples 1-3 and Comparative Examples 1-3 were tested according to GB / T30127-2013 "Detection and Evaluation of Far-Infrared Properties of Textiles", with a far-infrared wavelength range of 8-15μm.

[0049] The light absorption and heat storage properties of the knitted fabric sample were tested according to the test method specified in GTT TM044-2014 (20-minute temperature difference = temperature of the knitted fabric sample at 20 minutes - temperature of the ordinary knitted fabric at 20 minutes).

[0050] The test results are shown in Table 1.

[0051] Table 1. Statistical Table of Test Results

[0052]

[0053] As can be seen from the results in Table 1, the far-infrared emissivity of the knitted fabrics prepared in Examples 1-3 is not less than 88%, and the far-infrared radiation temperature rise is not less than 1.4℃, indicating that they possess far-infrared properties. In addition, the light absorption and heat storage performance test shows that the temperature of the knitted fabrics prepared in Examples 1-3 is greater than 5℃ after 20 minutes, indicating good light absorption and heat storage performance. Furthermore, the comparison between the examples and the comparative examples shows that the far-infrared emissivity, far-infrared radiation temperature rise, and 20-minute temperature difference of the fabrics prepared in Comparative Examples 1-3 are not as good as those in Examples 1-3. It is speculated that the method of mixing mineral powder with molten salt and performing high-temperature activation treatment can help to further improve the far-infrared performance and light absorption and heat storage performance of the knitted fabrics.

[0054] To further investigate the effect of the mass ratio of mineral powder to molten salt on the performance of knitted fabrics, based on Example 1, the mass ratio of germanium powder to molten salt was adjusted to 10, 12, 14, 16, 18, and 20:1. Sodium chloride was used instead of molten salt, and a mass ratio of germanium powder to sodium chloride of 16:1 was used as a control group. Knitted fabric samples were prepared according to the preparation method of Example 1. The far-infrared performance, light absorption and heat storage performance, negative ion release performance of the fabric were tested according to GT / B30128-2013, and antibacterial performance of the fabric was tested according to GT / B20944.3-2008 "Evaluation of antimicrobial properties of textiles: Part 3: Oscillation method". The results are shown in Table 2.

[0055] Table 2. Statistical Table of Test Results

[0056]

[0057] As can be seen from the results in Table 2, in terms of far-infrared emissivity, there is no significant increase in far-infrared emissivity as the mass ratio of germanium powder to molten salt increases. When the mass ratio of the two exceeds 16:1, the far-infrared emissivity decreases slightly, which is consistent with the performance of the 20-minute temperature difference.

[0058] Regarding the performance of releasing negative ions, the fabric’s performance of releasing negative ions increases with the increase in the mass ratio of germanium powder to molten salt. When the mass ratio of the two exceeds 16:1, the far-infrared emissivity decreases. It is speculated that the mass ratio of germanium powder to molten salt affects the fabric’s performance of releasing negative ions.

[0059] In terms of antibacterial properties, with the increase in the mass ratio of germanium powder to molten salt, the antibacterial rate of knitted fabric against Escherichia coli and Staphylococcus aureus is improved, and is much greater than the 70% requirement in the standard. The antibacterial rate of Candida albicans is also improved, with its antibacterial rate increasing from 85% to 96%, which is greater than the 60% requirement in the national standard.

[0060] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A far-infrared heat-retaining knitted fabric for down jackets, characterized in that: The knitted fabric includes far-infrared heat-storing fibers. The far-infrared heat-storing fibers, by weight, are made by mixing 80-100 parts of polyester masterbatch, 20-30 parts of far-infrared masterbatch and 1-5 parts of antibacterial particles evenly, first by melt extrusion granulation, and then by melt spinning. The far-infrared masterbatch is obtained by mixing ore powder with molten salt, first activating it at high temperature, then using propylene glycol as solvent, with the activated ore powder as the main material, adding dispersing aids, dispersing evenly to obtain a slurry, and finally mixing the slurry with polyester resin evenly, followed by concentration, melting, and granulation. The high-temperature activation treatment is 220-250℃ for 3-5 hours. The ore powder is one of germanium stone powder, volcanic rock powder, or selenium ore powder. The molten salt is a binary molten salt, comprising 60% sodium nitrate and 40% potassium nitrate by mass percentage. The dispersing agent is water glass and sodium dodecyl sulfate. The mass ratio of propylene glycol, water glass, and sodium dodecyl sulfate is 1-2:2-3:1-5.

2. The far-infrared heat-retaining knitted fabric for down jackets according to claim 1, characterized in that: The mass ratio of the ore powder to the molten salt is 10-20:1, and the mass ratio of the ore powder to the polyester resin is 20-50:

100.

3. The far-infrared heat-retaining knitted fabric for down jackets according to claim 1, characterized in that: The antibacterial particles are nano zinc oxide or nano silver oxide.

4. A method for preparing a far-infrared heat-retaining knitted fabric for down jackets as described in any one of claims 1-3, characterized in that: Includes the following steps: (1) After mixing the ore powder with molten salt, the mixture is first activated at high temperature. Then, using propylene glycol as solvent and the activated ore powder as the main material, a dispersing agent is added and the mixture is dispersed evenly to obtain a slurry. Finally, the slurry is mixed evenly with polyester resin and then concentrated, melted, and granulated to obtain far-infrared masterbatch. (2) According to the weight parts, 80-100 parts of polyester masterbatch, 20-30 parts of far-infrared masterbatch obtained in step (1) and 1-5 parts of antibacterial particles are first melt-extruded and granulated, and then melt-spun to obtain far-infrared heat storage fiber. (3) The far-infrared heat storage fiber obtained in step (2) is woven into the far-infrared heat storage knitted fabric for the down jacket.

5. The method for preparing a far-infrared heat-retaining knitted fabric for down jackets according to claim 4, characterized in that, In step (2), the spinneret for melt spinning has 32-35 round holes with a diameter of 0.4-0.6 mm; the winding speed is 800-1000 m / min and the melt index is 35-40 g / 10 min.

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