Copper antibacterial polyamide 6 master batch and preparation method and application thereof

Abstract

The application discloses copper antibacterial polyamide 6 master batch and a preparation method and application thereof, and belongs to the technical field of functional fiber materials. The preparation of the copper antibacterial polyamide 6 master batch comprises the following steps: (1) using benzotriazole to modify nano cuprous oxide powder to obtain modified nano cuprous oxide powder; (2) the modified nano cuprous oxide powder, polyamide 6 chips and a dispersing agent are subjected to melt plasticization, screw transmission and shearing, water cooling and pelletization, and vibration screening to obtain the copper antibacterial polyamide 6 master batch. The copper antibacterial polyamide 6 master batch is applied to copper antibacterial polyamide 6 pre-oriented yarn melt spinning, and the obtained pre-oriented yarn has good antibacterial property, spinnability and oxidation resistance, and the copper particles are less left in a spinning assembly, the service life of the spinning assembly is long, the spinning process has good operability, the production efficiency is high, and the application is suitable for large-scale industrial production.

Description

TECHNICAL FIELD

[0001] The application particularly relates to a copper antibacterial polyamide 6 master batch as well as a preparation method and application thereof, and belongs to the technical field of functional fiber materials. BACKGROUND

[0002] Polyamide 6 fiber is also known as polyamide 6 fiber, commonly known as nylon 6. Polyamide 6 fiber has good comprehensive performance, excellent wear resistance, and is widely used. The demand for polyamide 6 fiber with antibacterial properties is increasing. Research has found that elemental copper and its compounds are excellent antibacterial agents. Copper-based antibacterial agents have ideal antibacterial effects on bacteria and fungi, and excellent antiviral activity rate; copper is an important trace element for maintaining human life activities, and has the characteristics of good safety to human body and environmental friendliness. Therefore, polyamide 6 fiber modified by copper-based antibacterial agents has broad development prospects.

[0003] Copper-based antibacterial agents can be divided into nano-copper, cuprous oxide, copper oxide and copper salt, and have been widely used. Chinese patent CN118087070A discloses a preparation method of low-concentration high-dispersion nano-copper antibacterial polyamide fiber. The method reduces copper oxide particles to nano-copper particles by ring-opening reaction of caprolactam under hydrothermal action to obtain modified copper nanoparticles, and then further utilizes the twist layering extrusion technology to prepare nano-copper antibacterial polyamide master batch, and then the obtained nano-copper antibacterial polyamide master batch is diluted and spun to obtain nano-copper antibacterial polyamide fiber with antibacterial function, but the modified copper nanoparticles in the invention are not subjected to antioxidant treatment, and have the problem of easy oxidation discoloration. Chinese patent CN105332083A provides a preparation method of low-concentration high-dispersion nano-copper antibacterial polyamide fiber. The method combines copper oxide with mesoporous zirconium phosphate carrier, and then further melts and spins with polyamide to prepare mesoporous zirconium phosphate supported copper oxide antibacterial polyamide fiber. The fiber has certain antibacterial property, but the mesoporous zirconium phosphate carrier used in the invention leads to poor spinnability, and easily damages the spinneret during spinning. Chinese patent CN1775859A discloses a preparation method of antibacterial polyamide master batch and fiber. The antibacterial master batch is composed of polyamide chip carrier and functional powder, and the functional powder is nano-titanium dioxide loaded with copper ion antibacterial agent. Although the method achieves certain antibacterial effect, it also faces the problem of poor compatibility of inorganic antibacterial material with fiber material, which leads to the decrease of antibacterial property and strength of the fiber material.

[0004] In summary, there are three major problems in the application of inorganic copper-based antibacterial agent in fibers, which need to be solved urgently. One is that the nano-powder has serious agglomeration phenomenon, poor compatibility with the polymer matrix material, and is difficult to disperse uniformly. Two is that copper is easy to oxidize and discolor, resulting in poor color stability and uniformity of the fiber. Three is that the spinnability of the melt decreases with the introduction of the antibacterial agent. Therefore, it has high social and economic value to develop a polyamide 6 master batch with good antibacterial property, spinnability and oxidation resistance and a spinning process thereof. SUMMARY

[0005] To solve the problems in the prior art, the purpose of the present application is to provide a copper antibacterial polyamide 6 master batch and a preparation method thereof. The copper antibacterial polyamide 6 master batch prepared has good antibacterial property, spinnability and oxidation resistance. On this basis, the copper antibacterial polyamide 6 master batch is applied to the production process of copper antibacterial polyamide 6 pre-oriented yarn, which has good spinning performance and small damage to the spinning equipment.

[0006] The technical scheme of the present application is as follows:

[0007] A copper antibacterial polyamide 6 master batch, according to weight parts, the copper antibacterial polyamide 6 master batch comprises the following components: polyamide 6 chips 70-90 parts, nano-cuprous oxide powder 10-30 parts, dispersant powder 1-3 parts; the average particle size of the nano-cuprous oxide powder is 350 nm-1 μm, the cuprous oxide content in the nano-cuprous oxide powder reaches more than 99%, the surface morphology of the nano-cuprous oxide powder is spherical or spherical-like, and the specific surface area is more than 8 m 2 / g.

[0008] Preferably, the relative viscosity of the polyamide 6 chips is between 2.46 and 2.47, and the water content is between 400 and 600 ppm.

[0009] The dispersant is one or two of stearic acid, γ-mercaptopropyltrimethoxysilane, 3-glycidyl ether oxypropyltrimethoxysilane and microcrystalline paraffin.

[0010] Preferably, the nano-cuprous oxide powder is a nano-cuprous oxide powder modified by benzotriazole.

[0011] The present application also provides a preparation method of the above-mentioned copper antibacterial polyamide 6 master batch, comprising the following steps:

[0012] S1, preparation of modified nano-cuprous oxide powder: nano-cuprous oxide powder is mixed with benzotriazole in a mixture of ethanol and water, wherein the dosage of benzotriazole is 40% to 60% of the content of nano-cuprous oxide powder; after dispersion in an ultrasonic disperser, the mixture is heated and stirred for sufficient reaction; after the reaction is completed, the product is centrifuged and washed with a mixture of ethanol and water for multiple times to remove unreacted benzotriazole surface modifier, thereby obtaining modified nano-cuprous oxide powder;

[0013] S2, preparation of copper antibacterial polyamide 6 master batch: 70 to 90 parts of polyamide 6 chips, 10 to 30 parts of nano-cuprous oxide powder and 1 to 3 parts of dispersant powder are fed through a feeder, and the fed materials are melted and plasticized through a double-screw extruder, transmitted and sheared through a screw, water-cooled, granulated, screened and dried to obtain a copper antibacterial polyamide 6 master batch.

[0014] Preferably, in the melting and plasticizing stage of step S2, the first section of the double-screw extruder has a temperature zone of 220 to 230℃, the second section has a temperature zone of 230 to 240℃, the third section has a temperature zone of 230 to 240℃, the fourth, fifth and sixth sections have a temperature zone of 200 to 220℃, the seventh section has a temperature zone of 190 to 200℃, the eighth section has a temperature zone of 180 to 190℃, the ninth section has a temperature zone of 180 to 190℃, and the die head has a temperature zone of 230 to 240℃.

[0015] The copper antibacterial polyamide 6 master batch prepared according to the above method is applied to the production of copper antibacterial polyamide 6 pre-oriented yarn.

[0016] The application further provides a production process of copper antibacterial polyamide 6 pre-oriented yarn, which comprises the following steps:

[0017] The polyamide 6 chips and the copper antibacterial polyamide 6 master batch are melted through a screw extruder to obtain a melt, the melt enters a spinning box, is metered by a metering pump and then enters a spinning assembly, the melt is filtered through a filter material of the spinning assembly, enters a spinning hole of a spinneret and forms a single yarn stream in the spinning hole, the single yarn is cooled by side blowing, is bundled and oiled, is drawn and wound to form a copper antibacterial polyamide 6 pre-oriented yarn.

[0018] Preferably, the added copper antibacterial polyamide 6 master batch accounts for 3% to 6% of the mass of the polyamide 6 chips.

[0019] Preferably, the temperatures of the first, second, third, fourth and fifth zones of the screw extruder are 250 to 275℃, and the temperature of the biphenyl furnace is 260 to 265℃.

[0020] Preferably, the metering pump is of 2.4*12cc / rev specification, and the filter material of the spinning assembly mainly comprises metal sand and filter screen; the metal sand is mixed according to 35 / 45 mesh and 20 / 35 mesh specifications at a ratio of 1:1, and the filter screen is of 30 mu specification.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] 1. The copper antibacterial polyamide 6 master batch provided by the application adopts nano cuprous oxide powder modified by benzotriazole as an antibacterial agent, the modified nano cuprous oxide powder antibacterial agent has a spherical or spherical-like shape, strong structural stability, small surface energy, no easy adhesion between particles, good thixotropy, small friction coefficient and small equipment wear.

[0023] 2. In the application, the nano cuprous oxide powder is modified by benzotriazole, which is an organic heterocyclic compound, can be adsorbed and complexed on the surface of the nano cuprous oxide powder, and forms a dense antioxidant film, which solves the oxidation problem of the copper antibacterial polyamide 6 master batch in the process of preparing copper antibacterial polyamide 6 pre-oriented yarn spinning.

[0024] 3. The copper antibacterial polyamide 6 pre-oriented yarn production process provided by the application adopts the copper antibacterial polyamide 6 master batch, and the copper antibacterial polyamide 6 pre-oriented yarn prepared has good antioxidant performance and antibacterial performance; compared with the prior art, the spinning melt temperature applied in the copper antibacterial polyamide 6 pre-oriented yarn production process is 10-15 DEG C higher than that of the prior art, the spinning filter material is composed of metal sand of 35 / 45 mesh and 20 / 35 mesh specifications mixed according to a ratio of 1:1 and filter screen of 30 mu specification, the above improvements can effectively improve the fluidity of the melt, reduce the residue of copper particles in the spinning assembly, and further prolong the service life of the spinning assembly; the process has strong operability, high production efficiency, and is suitable for large-scale industrial production.

[0025] 4. The dispersant used in this invention is one or two of stearic acid, γ-mercaptopropyltrimethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, and microcrystalline wax. Compared with previous technologies, the dispersant used has good coating properties for nano-cuprous oxide, inhibits the agglomeration of nano-cuprous oxide powder, and improves the spinnability of copper antibacterial polyamide 6 pre-oriented yarn. Compared with other dispersants, the copper antibacterial polyamide 6 pre-oriented yarn prepared by stearic acid dispersant has the best spinnability, which is due to the carboxylic acid in the stearic acid dispersant. The polar interaction between the stearic acid dispersant and the carboxylic acid and amide functional groups of the polyamide 6 molecule enables effective dispersion and dissolution of the stearic acid dispersant in the polyamide 6 matrix. Some stearic acid molecules are located outside the interface between the polyamide 6 matrix and the nano-cuprous oxide, which results in a strong interfacial interaction between the nano-cuprous oxide and the polyamide 6 matrix. This improves the peeling and dispersion of the nano-cuprous oxide powder during the spinning and melting process, reduces the residue of large copper particles in the spinning assembly during the production process, and further extends the life of the spinning assembly. Attached Figure Description

[0026] Figure 1 This is a morphology diagram of the benzotriazole-modified nano-cuprous oxide powder in Example 1. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0028] Unless otherwise specified, all materials and reagents used in the following examples are commercially available; and all methods used in the following examples are conventional methods.

[0029] Example 1

[0030] This embodiment provides a copper antibacterial polyamide 6 masterbatch, comprising the following components by weight: 83.5 parts polyamide 6 chips, 15 parts nano cuprous oxide powder, and 1.5 parts dispersant powder; wherein the polyamide 6 chips have a relative viscosity of 2.46–2.47 and a water content of 400–600 ppm; the nano cuprous oxide powder has an average particle size of 350 nm–1 μm, a cuprous oxide content of over 99%, and a specific surface area of ​​over 8 m². 2 The dispersant powder is stearic acid, with a surface morphology of spherical or near-spherical shape and a weight of 1 g or more.

[0031] The preparation method of the copper antibacterial polyamide 6 masterbatch includes the following steps:

[0032] S1, preparation of modified nano-cuprous oxide powder: nano-cuprous oxide powder is mixed with benzotriazole in a mixture of ethanol and water, wherein the dosage of benzotriazole added is 50% of the content of nano-cuprous oxide powder; both are dispersed in an ultrasonic disperser for 1 h, then heated to 80℃ and stirred for reaction for 4 h; after the reaction is completed, the product is centrifuged, then washed with an ethanol aqueous solution for at least 3 times to remove unreacted benzotriazole surface modifier, thereby obtaining modified nano-cuprous oxide powder. As shown in FIG. 1, the surface morphology of the prepared modified nano-cuprous oxide powder is spherical or spherical-like, and the initial oxidation temperature thereof is 275℃; Figure 1

[0033] S2, preparation of copper antibacterial polyamide 6 master batch: polyamide 6 chips are added through the main feeding position of a feeder, and the modified nano-cuprous oxide powder and the dispersant stearic acid powder obtained in step S1 are uniformly mixed and then added through the side feeding position of the feeder; the added materials are melted and plasticized by a double-screw extruder to obtain a melt; the temperature control of each section of the double-screw extruder is as follows: the first section is 225℃, the second section is 235℃, the third section is 235℃, the fourth section is 215℃, the fifth section is 205℃, the sixth section is 200℃, the seventh section is 195℃, the eighth section is 185℃, the ninth section is 180℃, and the die head temperature is 235℃; the melt is transmitted and sheared by the screw, then water-cooled, granulated, screened by a vibrating screen, and dried to obtain a copper antibacterial polyamide 6 master batch.

[0034] Example 2

[0035] This example provides a copper antibacterial polyamide 6 master batch, which is different from example 1 in that:

[0036] The dispersant used in step S1 is 1.5 parts of γ-mercaptopropyltrimethoxysilane.

[0037] The polyamide 6 chips and the nano-cuprous oxide powder are added in the same amount as in example 1, and the preparation method of the copper antibacterial polyamide 6 master batch is the same as that in example 1, which will not be repeated here.

[0038] Example 3

[0039] This example provides a copper antibacterial polyamide 6 master batch, which is different from example 1 in that:

[0040] The dispersant used in step S1 is composed of 1.5 parts of microcrystalline wax and 0.5 parts of stearic acid which are uniformly mixed.

[0041] The polyamide 6 chips and the nano-cuprous oxide powder are added in the same amount as in example 1, and the preparation method of the copper antibacterial polyamide 6 master batch is the same as that in example 1, which will not be repeated here.

[0042] Example 4

[0043] ​The embodiment provides a copper antibacterial polyamide 6 master batch, which is different from the embodiment 1 in that:

[0044] The copper antibacterial polyamide 6 master batch comprises the following components in parts by weight: 90 parts of polyamide 6 chips, 30 parts of nano cuprous oxide powder and 3 parts of dispersant powder; the dispersant powder is gamma-mercaptopropyl trimethoxysilane.

[0045] The preparation method of the copper antibacterial polyamide 6 master batch is different from the embodiment 1 in that:

[0046] The dosage of the benzotriazole added in the step S1 is 60% of the content of the nano cuprous oxide powder;

[0047] In the melting and plasticizing stage of the step S2, the temperature control of each section of the double-screw extruder is as follows: the first section is 230 DEG C, the second section is 240 DEG C, the third section is 240 DEG C, the fourth section is 220 DEG C, the fifth section is 220 DEG C, the sixth section is 220 DEG C, the seventh section is 200 DEG C, the eighth section is 190 DEG C, the ninth section is 190 DEG C, and the temperature of the die head is 240 DEG C.

[0048] Embodiment 5

[0049] The embodiment provides a copper antibacterial polyamide 6 master batch, which is different from the embodiment 1 in that:

[0050] The copper antibacterial polyamide 6 master batch comprises the following components in parts by weight: 70 parts of polyamide 6 chips, 10 parts of nano cuprous oxide powder and 1 part of dispersant powder; the dispersant powder is composed of 1.5 parts of microcrystalline wax and 0.5 parts of stearic acid.

[0051] The preparation method of the copper antibacterial polyamide 6 master batch is different from the embodiment 1 in that:

[0052] The dosage of the benzotriazole added in the step S1 is 40% of the content of the nano cuprous oxide powder;

[0053] In the melting and plasticizing stage of the step S2, the temperature control of each section of the double-screw extruder is as follows: the first section is 220 DEG C, the second section is 230 DEG C, the third section is 230 DEG C, the fourth section is 200 DEG C, the fifth section is 200 DEG C, the sixth section is 200 DEG C, the seventh section is 190 DEG C, the eighth section is 180 DEG C, the ninth section is 180 DEG C, and the temperature of the die head is 230 DEG C.

[0054] Comparative example 1

[0055] The comparative example 1 provides a copper antibacterial polyamide 6 master batch, which comprises the following components in parts by weight: polyamide 6 chips 83.5 parts, nano cuprous oxide powder 15 parts, dispersant powder 1.5 parts; the relative viscosity of the polyamide 6 chips is 2.46-2.47, and the water content is 400-600 ppm; the average particle size of the nano cuprous oxide powder is 350 nm-1 μm, the cuprous oxide content in the nano cuprous oxide powder is more than 99%, the specific surface area is more than 8 m 2 / g, and the surface morphology is spherical or spherical-like; the dispersant powder is stearic acid.

[0056] The preparation method of the copper antibacterial polyamide 6 master batch comprises the following steps: the polyamide 6 chips are fed through the main feeding position of a feeder, the nano cuprous oxide powder and the stearic acid powder are uniformly mixed and then fed through the feeding position of the feeder, the fed materials are plasticized and melted in a double-screw extruder to obtain a melt, the temperature of each section of the double-screw extruder is controlled as follows: the first section is 225℃, the second section is 235℃, the third section is 235℃, the fourth section is 215℃, the fifth section is 205℃, the sixth section is 200℃, the seventh section is 195℃, the eighth section is 185℃, the ninth section is 180℃, and the temperature of the die head is 235℃; the melt is transmitted and sheared by the screw, water-cooled, granulated, screened by a vibrating screen, and dried to obtain the copper antibacterial polyamide 6 master batch.

[0057] Example 6

[0058] In this example, the copper antibacterial polyamide 6 master batch prepared in Example 1 is applied to the production of copper antibacterial polyamide 6 pre-oriented yarn, which comprises the following steps:

[0059] 95.5 parts of polyamide 6 chips and 4.5 parts of the copper antibacterial polyamide 6 master batch obtained in Example 1 are respectively fed into a screw extruder from a chip storage tank and a master batch feeder to be melted to obtain a melt, 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℃, 266℃, 264℃, 266℃ and 270℃ respectively, the temperature of a biphenyl furnace is 263℃, the obtained melt enters a spinning box, is metered by a metering pump, and then enters a spinning assembly, the melt is filtered by a filtering material in the spinning assembly, the filtering material is composed of metal sand and a filter screen, the metal sand is 35 / 45 mesh and 20 / 35 mesh in a ratio of 1:1, and the filter screen is 30 μ, and then the filtered melt forms single yarn streams in the spinning holes of a spinneret, the single yarns are cooled by side blowing, are bundled and oiled, are drawn and wound to form copper antibacterial polyamide 6 pre-oriented yarn.

[0060] Example 7

[0061] In this example, the copper antibacterial polyamide 6 master batch of Example 2 is applied to the production of copper antibacterial polyamide 6 pre-oriented yarn, and the steps are as described in Example 6, except that the copper antibacterial polyamide 6 master batch of Example 2 is used instead of the copper antibacterial polyamide 6 master batch of Example 1.

[0062] 99 parts of polyamide 6 chips and 3 parts of copper antibacterial polyamide 6 masterbatch obtained from Example 2 were respectively fed from a chip storage tank and a masterbatch feeder into a screw extruder for melting to obtain a melt.

[0063] The temperatures of the first zone, the second zone, the third zone, the fourth zone and the fifth zone of the screw extruder were all 250°C, and the temperature of the biphenyl furnace was 260°C.

[0064] Example 8

[0065] In this example, the copper antibacterial polyamide 6 masterbatch of Example 3 was used for the production of copper antibacterial polyamide 6 pre-oriented yarn, and the steps were as described in Example 6. The difference between this example and Example 6 was that:

[0066] 90 parts of polyamide 6 chips and 5.4 parts of copper antibacterial polyamide 6 masterbatch obtained from Example 3 were respectively fed from a chip storage tank and a masterbatch feeder into a screw extruder for melting to obtain a melt;

[0067] The temperatures of the first zone, the second zone, the third zone, the fourth zone and the fifth zone of the screw extruder were all 275°C, and the temperature of the biphenyl furnace was 265°C.

[0068] Comparative Example 2

[0069] In this comparative example, the copper antibacterial polyamide 6 masterbatch obtained from Comparative Example 1 was used for the production of copper antibacterial polyamide 6 pre-oriented yarn, and the steps were as described in Example 6.

[0070] Performance test

[0071] The pre-oriented yarn samples of Example 6, Example 7, Example 8 and Comparative Example 2 were selected for spinning performance, mechanical property and antibacterial property tests, and the samples were named as Sample 1, Sample 2, Sample 3 and Comparative Sample 1 respectively. The results are shown in Table 1.

[0072] Table 1 Performance of copper antibacterial polyamide 6 pre-oriented yarn

[0073]

[0074]

[0075] The results show that the filament fineness of Sample 1, Sample 2 and Sample 3 of the examples is between 0.8-2 dpf (i.e. 0.72-1.8 dtex), the breaking strength is above 3.5 cN / dtex, the elongation at break is 60%-70%, the evenness is less than 1%, and the copper content is 6.0 x 10 3mg / kg or more, the bacteriostatic rate reaches 98% or more; the spinning assembly cycle thereof can reach 4 days or more, the full roll rate is ≥85%, and the AA rate is ≥80%. Through comparison of the sample 1, the sample 2 and the sample 3, the results show that the change of the dispersant has no obvious influence on the mechanical property and the bacteriostatic rate of the fiber, but has a certain influence on the assembly cycle, the full roll rate and the AA rate, and the stearic acid is preferably used as the dispersant; through comparison of the sample 1 and the comparative sample 1, the results show that the antioxidant treatment of the nano cuprous oxide has a significant influence on the assembly cycle, the full roll rate and the AA rate of the fiber, and the yarn without the antioxidant treatment is easily oxidized, and the downstream application thereof is limited.

Claims

1. A copper antibacterial polyamide 6 masterbatch, characterized in that, The copper antibacterial polyamide 6 masterbatch comprises, by weight, the following components: 70-90 parts polyamide 6 chips, 10-30 parts nano cuprous oxide powder, and 1-3 parts dispersant powder; the nano cuprous oxide powder has a cuprous oxide content of over 99%, and its surface morphology is spherical or near-spherical with a specific surface area of ​​8 m². 2 / g or more; The dispersant powder is stearic acid; The nano-cuprous oxide powder is nano-cuprous oxide powder modified with benzotriazole; The polyamide 6 chips have a relative viscosity between 2.46 and 2.47 and a water content between 400 and 600 ppm.

2. A method for preparing the copper antibacterial polyamide 6 masterbatch according to claim 1, characterized in that, The preparation method includes the following steps: S1. Preparation of benzotriazole-modified nano-cuprous oxide powder: Nano-cuprous oxide powder and benzotriazole are mixed in a mixture of ethanol and water, wherein the dosage of benzotriazole is 40% to 60% of the nano-cuprous oxide powder content; after the two are dispersed in an ultrasonic disperser, they are heated and stirred to react fully. After the reaction is completed, the product is centrifuged and washed multiple times with a mixture of ethanol and water to remove unreacted benzotriazole surface modifier, thereby obtaining the benzotriazole-modified nano-cuprous oxide powder. S2. Preparation of copper antibacterial polyamide 6 masterbatch: 70-90 parts of polyamide 6 chips, 10-30 parts of benzotriazole modified nano cuprous oxide powder and 1-3 parts of dispersant powder are fed into a feeder. The added materials are then melt-plasticized, conveyed and sheared by a twin-screw extruder, water-cooled pelletized, vibrated and screened and dried to prepare copper antibacterial polyamide 6 masterbatch.

3. The method for preparing copper antibacterial polyamide 6 masterbatch according to claim 2, characterized in that, In step S2, during the melt plasticizing stage, the first temperature zone of the twin-screw extruder is 220–230℃, the second temperature zone is 230–240℃, the third temperature zone is 230–240℃, the fourth, fifth, and sixth temperature zones are 200–220℃, the seventh temperature zone is 190–200℃, the eighth temperature zone is 180–190℃, the ninth temperature zone is 180–190℃, and the die head temperature zone is 230–240℃.

4. The copper antibacterial polyamide 6 masterbatch according to claim 1 or the copper antibacterial polyamide 6 masterbatch prepared according to the preparation method according to claim 2 or 3 is used in the production of copper antibacterial polyamide 6 pre-oriented yarn.

5. A production process for copper antibacterial polyamide 6 pre-oriented yarn, characterized in that, The process includes the following steps: Polyamide 6 chips and copper antibacterial polyamide 6 masterbatch as described in claim 1 are melted by a screw extruder to obtain a melt. The melt enters the spinning box, is metered by a metering pump, and then enters the spinning assembly. The melt is filtered by the filter material of the spinning assembly and forms a single filament stream in the spinneret. The single filament is cooled by side blowing, bundled and oiled, and drawn and wound to form a copper antibacterial polyamide 6 pre-oriented yarn.

6. The production process of copper antibacterial polyamide 6 pre-oriented yarn according to claim 5, characterized in that, The added copper antibacterial polyamide 6 masterbatch accounts for 3% to 6% of the mass of the polyamide 6 chips.

7. The production process of copper antibacterial polyamide 6 pre-oriented yarn according to claim 5, characterized in that, The temperature of the screw extruder in zones one, two, three, four and five is 250-275℃.

8. The production process of copper antibacterial polyamide 6 pre-oriented yarn according to claim 5, characterized in that, The metering pump has a specification of 2.4·12 cc / rev, and the filter material of the spinning assembly mainly includes metal sand and filter screen. The metal sand is mixed in a 1:1 ratio of 35 / 45 mesh and 20 / 35 mesh, and the filter screen has a specification of 30 μm.

Images