Preparation method of cool alkali-dissolved nylon 6 master batch and fiber and application thereof

Abstract

The present application relates to the technical field of chemical fibers, and particularly relates to a kind of cool alkali-dissolving nylon 6 master batch and fiber and a preparation method of application thereof, comprising the following steps: grinding and crushing nylon 6 powder, alkali-soluble modified low-melting polyester chip, pre-dispersed composite jade powder and dispersant respectively, then mixing and processing in a high-speed mixer to obtain mixed powder; the mixed powder is prepared into cool alkali-dissolving nylon 6 master batch through melting plasticization, screw transmission and shearing, water cooling, vibration screening and air drying; the prepared cool alkali-dissolving nylon 6 master batch is made into cool alkali-dissolving nylon 6 fiber, and then the cool alkali-dissolving nylon 6 fiber is used to prepare cool alkali-dissolving nylon 6 cloth. Compared with ordinary nylon 6 fiber, the nylon 6 fiber prepared by the present application has a larger specific surface area and a natural comfortable hand feeling; the moisture absorption and moisture conductivity are better, and the fiber has the characteristics of fast drying, non-stickiness, comfort, air permeability and health.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical fibers, in particular to a preparation method of cool alkali-dissolving polyamide 6 master batch and fiber and application thereof. BACKGROUND

[0002] With the continuous expansion of the application of polyamide fibers and the continuous improvement of people's quality of life, the role of textiles is no longer just simple wearing performance, but more and more additional functions, among which, cool textiles have always been the focus of people's pursuit. Cool textiles have appeared in the market in large quantities in the early years, but their use effects are uneven, and it is difficult to meet people's wearing requirements, or in other words, the effect of new textiles is good, but the effect becomes worse and worse after washing.

[0003] Cool textiles are widely used in summer products due to their comfortable wearing feeling. There are mainly three ways to make chemical fiber textiles have a cool effect on the market: the first way is to add materials to the spinning fiber to make the fiber have a smooth contact cool feeling, but the effect is not lasting, in other words, the textile is cool only for a moment when it is worn, and the product is not resistant to washing, and the effect of the product becomes worse and worse after washing. The second way is to change the cross section of the fiber to obtain coolness. This way can reduce the contact area of the textile and the skin, and achieve the effect of coolness through moisture absorption and quick drying. However, this kind of textile has poor hand feeling, is hard, is easy to deform after washing, and has not been well promoted for use. The third way combines the first two ways, and although each aspect is improved, the main problem is the poor hand feeling and the easy deformation of the fabric.

[0004] In summary, there have been many studies on cool textiles on the market, but it is still necessary to further innovate to obtain textiles with lasting cool performance, good hand feeling, washing resistance, air permeability, and multiple characteristics such as imitation of natural fibers, so that the product has comfortable hand feeling and wearing performance. SUMMARY

[0005] The application relates to a preparation method of cool alkali-dissolving polyamide 6 master batch and fiber and application thereof.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0007] A preparation method of cool alkali-dissolving polyamide 6 master batch, comprising the following steps:

[0008] The polyamide 6 powder, the alkali-soluble modified low-melting polyester chip, the pre-dispersed composite jade powder and the dispersant are respectively ground and crushed, and then mixed in a high-speed mixer to obtain a mixed powder; the mixed powder is prepared into a cool alkali-soluble polyamide 6 master batch through melting plasticization, screw transmission and shearing, water cooling and granulation, vibration screening and air drying.

[0009] The pre-dispersed composite jade powder is prepared by the following steps: taking nephrite as a raw material, crushing the nephrite into a jade powder, soaking the jade powder in deionized water, adding zinc stearate, mixing, separating the mixed powder from water, drying, grinding, and standing for 12 hours; soaking the mixed powder in a high-molecular EBS for 12 hours, standing for 36 hours, adding polyurethane, stirring, and drying to obtain the pre-dispersed composite jade powder.

[0010] Further, the polyamide 6 powder is 70-92 parts by weight, the alkali-soluble modified low-melting polyester chip is 1-30 parts by weight, the pre-dispersed composite jade powder is 1-10 parts by weight, and the dispersant is 0.5-1.2 parts by weight.

[0011] Further, the polyamide 6 powder is obtained by putting the spinning polyamide 6 chip into a liquid nitrogen freezer and a grinding machine for cryogenic grinding treatment to obtain a polyamide 6 powder with a mesh size of 300-500; the cryogenic grinding treatment temperature is-80℃ to-20℃, and the grinding speed is 2500r / min.

[0012] Further, the alkali-soluble modified low-melting polyester chip has a relative viscosity of 0.5-1.2, a water content of ≤500ppm, a melting point of 200-250℃, and a solubility in 80-100℃ alkaline hot water of ≥75%.

[0013] Further, the dispersant is one or a mixture of more than one of zinc stearate, paraffin, EBS and JIAwax-100.

[0014] Further, the stirring time after adding the polyurethane is 4-6h.

[0015] Further, the mixing speed of the high-speed mixer is 400-600rpm, the mixing temperature is 150-180℃, and the mixing time is 3-4h; the melting plasticization temperature is 270-280℃.

[0016] The application also includes a preparation method of the cool alkali-soluble polyamide 6 fiber, which is prepared from the cool alkali-soluble polyamide 6 master batch prepared by any one of the preparation methods described above, and includes the following steps:

[0017] The dry 1% to 12% cool alkali-dissolving nylon 6 master batch and 88% to 99% nylon 6 chips are mixed uniformly, and then are metered, mixed and extruded by a screw extruder, wherein the temperatures of the first zone, the second zone, the third zone, the fourth zone and the fifth zone of the screw extruder are 252 to 255 DEG C, 253 to 257 DEG C, 254 to 258 DEG C, 255 to 260 DEG C and 256 to 261 DEG C respectively;

[0018] The yarns are formed by the spinneret of the spinning assembly, and then are subjected to monomer suction, side blowing and cooling at a temperature of 21 to 23 DEG C and a wind speed of 0.35 to 0.55 m / min, are subjected to oiling at an oil rack height of 750 to 1450 mm and an oil agent concentration of 5% to 10%, are subjected to bundling in a pre-network at a pressure of 0.9 to 1.5 bar, are subjected to high-temperature stretching and setting in a heat box at a stretching ratio of 1.2 to 1.7 and a heat roller temperature of 140 to 180 DEG C, are subjected to main network at a pressure of 2.5 to 4.0 bar, and finally are wound and wound at a winding speed of 4250 to 4850 m / min to obtain the cool alkali-dissolving nylon 6 fiber.

[0019] The application further discloses a preparation method of the cool alkali-dissolving nylon 6 fiber.

[0020] The fiber is woven into a cloth, is subjected to oil removal and boiling for 40 min, and is subjected to setting at a temperature of 180 DEG C; and the cloth is subjected to treatment in an alkali solution at a pH of 10 to 13 and a temperature of 90 DEG C for 15 to 30 min to obtain the cool alkali-dissolving nylon 6 cloth.

[0021] Compared with the prior art, the cool alkali-dissolving nylon 6 fiber prepared from the cool alkali-dissolving nylon 6 master batch has a larger specific surface area and a natural hand feeling; the cool alkali-dissolving nylon 6 cloth prepared from the cool alkali-dissolving nylon 6 fiber has better moisture absorption and moisture conductivity, and has the characteristics of fast drying, no stickiness, comfort, air permeation and health; and the application opens up a new technical field of the conventional cool nylon 6 fiber in the market, and makes the product more comfortable in wearing performance and more natural in fiber feeling. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a fiber image under 5 thousand times optical microscope.

[0023] Figure 2 It is a fiber image under 1 thousand times optical microscope. DETAILED DESCRIPTION

[0024] The technical solutions of the present application are further illustrated below in combination with specific examples. It should be understood that the following examples are only illustrative and explanatory of the present application and should not be interpreted as limiting the scope of protection of the present application. Any technology realized based on the above description of the present application is covered within the scope intended to be protected by the present application. Example 1

[0025] The spun-polymer 6 chips were put into a liquid nitrogen refrigeration powder grinder for cryogenic grinding treatment, the treatment temperature was -70℃, and the grinding speed was 2500r / min, and 400-mesh polyamide 6 powder was obtained.

[0026] The natural nephrite was used as raw material, and the nephrite powder was first ground by a grinder, and then soaked in deionized water for pretreatment; then zinc stearate was added and mixed, and the dispersion of zinc stearate was used to remove the agglomerated glue in the nephrite powder; finally, the mixed powder was separated from water, dried, ground, and left for 12h to obtain a nephrite powder with a nano size of 20nm;

[0027] The nephrite powder with a nano size of 20nm was then soaked in high-molecular EBS for 36h, and then polyurethane was added and stirred for 5h, and finally the dispersed nephrite powder was dried to obtain a pre-dispersed composite nephrite powder.

[0028] 80 parts of polyamide 6 powder, 15 parts of alkali-soluble modified low-melting polyester chips, 3.8 parts of pre-dispersed composite nephrite powder, and 1.2 parts of dispersant were taken, and after grinding and crushing, they were mixed in a high-speed mixer to obtain a mixed powder; the mixed powder was prepared into a cool alkali-soluble polyamide 6 master batch by quantitative feeding, melting and plasticizing, screw transmission and shearing, water cooling and granulation, vibration screening, and air drying. Example 2

[0029] A method for preparing a 50D / 24F cool alkali-soluble polyamide 6 fiber.

[0030] Take 8% of the cool feeling base made of example 1 and 92% of the nylon 6 full-dull slice mixed evenly after metering, mixing, screw extruder melting, the temperature of the screw extruder is 255℃, 257℃, 258℃, 259℃, 259℃ respectively, then through the spinneret to form a bundle, then through the monomer suction, the side blowing cooling temperature is 22.5℃, the wind speed is 0.45m / min, the oiling height is 900mm, the oil type is 6352AY, the oil concentration is 7%, into the pre-network for bundling, the pre-network pressure is 1.2bar, into the hot box for high temperature stretching setting, the stretching ratio is 1.35, the hot roller temperature is 146℃, into the main network, the main network pressure is 3.8bar, finally winding, the winding speed is 4800m / min, 50D / 24F cool feeling alkali soluble nylon 6 fiber is obtained, the fiber is woven into a fabric, the oil is removed and boiled for 40min, 180℃ setting; after setting, the fabric is placed in an alkali solution with pH of 12 and temperature of 90℃ for 20min, then a cool feeling alkali soluble fiber 6 fabric is obtained, and its functionality is detected by a third party testing institution, as shown in the following table 1, and each index is qualified.

[0031] Table 1 functional test results

[0032] Test item Test method Standard value and tolerance Test result Determination Quick dry before washing GB / T 21655.1-2008 Evaporation rate: ≥0.18g / h Permeability: ≥10000 / (㎡·24h) Evaporation rate: 0.33 g / h Permeation rate: 1.14 x 10 4 ]] Comply Quick dry after washing GB / T 21655.1-2008 Evaporation rate: ≥0.18g / h Permeability: ≥10000 / (㎡·24h) Evaporation rate: 0.28 g / h Permeation rate: 1.11 x 10 4 ]] Comply Cooling sensation lasts [before washing] / Keep below 30℃ within 30min, and the maximum temperature drop ≥3℃ The highest temperature within 30min is 29.9, and the maximum temperature drop is 6.4℃ Comply Cooling sensation lasts [after washing] GB / T 8629-2017, 4N program washing 5 times, hanging to dry Keep below 30℃ within 30min, and the maximum temperature drop ≥3℃ The highest temperature within 30min is 28.9, and the maximum temperature drop is 7.5℃ Comply

[0033] Example 3:

[0034] A method for preparing a 70D / 48F cool feeling alkali soluble nylon 6 fiber.

[0035] Take 12% of the cool feeling base made of example 1 and 88% of the nylon 6 full-dull slice mixed evenly after metering, mixing, screw extruder melting, the temperature of the screw extruder is 252℃, 254℃, 258℃, 258℃, 258℃ respectively, then through the spinneret to form a bundle, then through the monomer suction, the side blowing cooling temperature is 22.8℃, the wind speed is 0.52m / min, the oiling height is 1000mm, the oil type is 6352AY, the oil concentration is 5%, into the pre-network for bundling, the pre-network pressure is 1.35bar, into the hot box for high temperature stretching setting, the stretching ratio is 1.42, the hot roller temperature is 150℃, into the main network, the main network pressure is 3.9bar, finally winding, the winding speed is 4600m / min, 70D / 48F cool feeling alkali soluble nylon 6 fiber is obtained, and its fiber microscope observation is carried out, as shown in the following table 2. Figure 1The SEM image of the fiber shows that the surface has concave-convex. The fiber is woven into a piece of cloth, the oil is removed and boiled for 40 min, and the temperature is set at 185°C. After setting, the piece of cloth is placed in an alkaline solution with a pH of 12 and a temperature of 90°C for 20 min to obtain 6 pieces of cool feeling alkaline solution fibers, and microscopic observation is performed on the 6 pieces of cool feeling alkaline solution fibers, Figure 2 The SEM image of the fiber shows that the surface has obvious grooves, the surface area of the fiber is increased, and the cool feeling performance is improved.

[0036] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific examples described are only illustrative, and are not intended to limit the scope of the present application, and modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A method for preparing a cool-feeling alkali-soluble nylon 6 fabric, characterized in that: Includes the following steps: Nylon 6 powder, alkali-soluble modified low-melting polyester chips, pre-dispersed composite jade powder, and dispersant are each pulverized and ground separately, then mixed in a high-speed mixer to obtain a mixed powder. The mixed powder is then melt-plasticized, screw-transmitted and sheared, water-cooled pelletized, vibrated screened, and blower-dried to prepare a cool-feeling alkali-soluble nylon 6 masterbatch. The alkali-soluble modified low-melting polyester chips have a melting point of 200-250℃. The pre-dispersed composite jade powder is prepared by: using nephrite ore as raw material, crushing it into jade powder, soaking it in deionized water, adding zinc stearate, mixing it, separating the mixed powder from water, drying it, grinding it, and letting it stand for 12 hours; soaking the mixed powder in high molecular weight EBS for 12 hours and letting it stand for 36 hours, adding polyurethane, stirring it, and drying it to obtain the pre-dispersed composite jade powder. The prepared cool-feeling alkali-soluble nylon 6 masterbatch is used to make cool-feeling alkali-soluble nylon 6 fiber. The cool-feeling alkali-soluble nylon 6 fiber is woven into a fabric, degreased, boiled in water for 40 minutes, and then set at a temperature of 180°C. After setting, the fabric is placed in an alkaline solution with a pH of 10-13 and a temperature of 90°C for 15-30 minutes to obtain cool-feeling alkali-soluble nylon 6 fabric.

2. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: By weight, the nylon 6 powder comprises 70-92 parts, the alkali-soluble modified low-melting polyester chips comprises 1-30 parts, the pre-dispersed composite jade powder comprises 1-10 parts, and the dispersant comprises 0.5-1.2 parts.

3. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The nylon 6 powder is obtained by placing spun nylon 6 chips into a liquid nitrogen cryogenic grinding mill for cryogenic pulverization to obtain nylon 6 powder of 300 mesh to 500 mesh; the cryogenic pulverization temperature is -80℃ to -20℃ and the pulverization speed is 2500 r / min.

4. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The alkali-soluble modified low-melting polyester chips have a relative viscosity of 0.5 to 1.2, a water content of ≤500 ppm, and a solubility of ≥75% in alkaline hot water at 80 to 100°C.

5. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The dispersant is one or more of zinc stearate, paraffin wax, and EBS.

6. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The stirring time after adding polyurethane is 4 to 6 hours.

7. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The high-speed mixer has a mixing speed of 400-600 rpm, a mixing temperature of 150-180℃, and a mixing time of 3-4 hours; the melting and plasticizing temperature is 270-280℃.

8. The method for preparing a cool-feeling alkali-soluble nylon 6 fabric according to claim 1, characterized in that: The process of converting the prepared cool-feeling alkali-soluble nylon 6 masterbatch into cool-feeling alkali-soluble nylon 6 fiber includes the following steps: After being dried, 1%–12% of cool-feeling alkali-soluble nylon 6 masterbatch and 88%–99% of nylon 6 chips are mixed evenly and then metered, mixed, and melted in a screw extruder. The temperatures of the first, second, third, fourth, and fifth zones of the screw extruder are 252–255℃, 253–257℃, 254–258℃, 255–260℃, and 256–261℃, respectively. The fibers are then extruded through the spinneret of the spinning assembly to form a bundle, followed by monomer suction and side-blowing cooling at a temperature of 21–23°C and a wind speed of 0.35–0.55 m / min. The bundle is then oiled at a height of 750–1450 mm and an oil concentration of 5%–10%. It then enters a pre-network for further bundling at a pressure of 0.9–1.5 bar. Next, it undergoes high-temperature stretching and setting in a hot box at a stretch ratio of 1.2–1.7 and a hot roller temperature of 140–180°C. Finally, it enters the main networker at a pressure of 2.5–4.0 bar and is wound at a speed of 4250–4850 m / min to obtain cool-feeling alkali-soluble nylon 6 fiber.

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