Bio-based novel material antibacterial PTT composite fiber and production process thereof

Abstract

The invention relates to the technical field of PTT composite fibers, in particular to a bio-based new material antibacterial PTT composite fiber and a production process thereof, the PTT composite fiber is a PET and PTT composite fiber, and the production process of the bio-based new material antibacterial PTT composite fiber comprises slice drying, slice melting, composite spinning, antibacterial agent grafting and alkali decrement treatment; the content of slice melting is as follows: dried PTT slices and carboxyl-terminated hyperbranched polyester are added into hot-melt extrusion equipment to form a PTT melt, and the hot-melt temperature of PTT in the hot-melt extrusion equipment is 230-245 DEG C; the content of the grafting antibacterial agent is as follows: immersing crude PTT composite fibers in a solvent, and grafting polyhexamethylene biguanide hydrochloride through an amide reaction to prepare crude antibacterial PTT composite fibers; the antibacterial PTT composite fiber has the advantage that the antibacterial property of the PTT composite fiber is more washable.

Description

Technical Field

[0001] This application relates to the technical field of PTT composite fibers, and in particular to a bio-based new material antibacterial PTT composite fiber and its production process. Background Art

[0002] The bio-based new material PTT (polytrimethylene terephthalate) composite fiber is obtained by melt spinning bio-based PTT and other materials through a specific process. This composite fiber has various advantages, can combine the characteristics of different materials, and endow the fiber with more excellent properties, such as better strength, elasticity, softness, dyeability, etc. On the other hand, by compounding with other bio-based or renewable materials, it helps to reduce the dependence on traditional petroleum-based raw materials and reduce the environmental impact.

[0003] Among them, the PTT fiber has excellent elastic performance, stable elasticity, and soft hand feeling, but its strength performance is insufficient; while the PET fiber has good wrinkle resistance and shape retention, and has high strength and elastic recovery ability. Therefore, the PTT / PET composite fiber combines the advantages of both and is widely used. In actual applications, it is often required to have antibacterial effects. The molecular chains of the PTT / PET composite fiber are connected by ester bonds, resulting in no active groups on the molecular chains of the PTT / PET composite fiber. Therefore, it is difficult to load antibacterial substances on its surface through bonding. In related technologies, there is a method of preparing cyclodextrin with carboxyl groups, adsorbing it on the surface of the PTT / PET composite fiber through hydrogen bonding, and then encapsulating metal ions with antibacterial effects to make the PTT / PET composite fiber have antibacterial effects. Although this method can achieve the purpose of making the PTT / PET composite fiber antibacterial, its water resistance is slightly insufficient, and after washing with water, the antibacterial performance drops significantly. Summary of the Invention

[0004] In order to make the antibacterial performance of the PTT composite fiber more resistant to washing, this application provides a bio-based new material antibacterial PTT composite fiber and its production process.

[0005] In the first aspect, this application provides a production process of a bio-based new material antibacterial PTT composite fiber, adopting the following technical solutions: A production process of a bio-based new material antibacterial PTT composite fiber, the PTT composite fiber is a PET and PTT composite fiber, and its production process includes chip drying, chip melting, composite spinning, grafting antibacterial agent, and alkali weight reduction treatment; Among them, the content of the chip melting is as follows: Add the dried PTT chips and end-carboxyl hyperbranched polyester into the hot melt extrusion equipment to form a PTT melt, and the hot melt temperature of PTT in the hot melt extrusion equipment is 230 - 245 °C; Add the dried PET chips to the hot melt extrusion equipment to form a PET melt. The hot melt temperature of PET is 260 - 270 °C; The content of the composite spinning is as follows: Feed the PTT melt and the PET melt to the spinneret of the spinning assembly through metering pumps for spinning respectively to obtain crude PTT composite fibers. The outer layer of the crude PTT composite fibers is a PTT fiber layer, and the inner layer is a PET core layer. The temperature of the metering pump for transporting and spinning the PTT melt and the spinneret holes on the spinneret plate is 255 - 265 °C, and the temperature of the metering pump for transporting and spinning the PET melt and the spinneret holes on the spinneret plate is 270 - 280 °C; The content of the grafted antibacterial agent is as follows: Immerse 90 - 110 g of the obtained crude PTT composite fibers in a solvent, then add 4 - 6 g of polyhexamethylene biguanide hydrochloride, then add 0.4 - 0.6 g of EDCI, 0.3 - 0.45 g of HOBt, and 0.4 - 0.6 g of an acid-binding agent, stir and react, filter and wash to obtain crude antibacterial PTT composite fibers.

[0006] By adopting the above technical solution, polyhexamethylene biguanide hydrochloride is an antibacterial agent with low biological toxicity, little harm to biological cells, and at the same time has broad-spectrum antibacterial properties. The guanidine group contained in its molecular structure has high activity, can make the polymer positively charged, and is easily adsorbed by various bacteria and viruses with negative charges, thereby inhibiting the splitting ability of bacteria and viruses and making them lose their reproductive ability. In addition, the film formed by the polymer blocks the respiratory channels of microorganisms, causing the microorganisms to die quickly. Polyhexamethylene biguanide hydrochloride is a broad-spectrum antibacterial agent, and has high-efficiency killing effects on Gram-positive bacteria, Gram-negative bacteria, fungi, yeasts, etc. However, polyhexamethylene biguanide hydrochloride has good water solubility, and the binding force directly loaded on the fiber surface is weak. After washing with water, its antibacterial performance drops rapidly. In this application, by adding a terminal carboxyl hyperbranched polyester to the PTT composite fiber, due to the low viscosity of the hyperbranched polymer in this application and the strong polarity of the terminal carboxyl hyperbranched polyester, the compatibility with the PTT composite fiber is insufficient. Therefore, during the spinning process, due to the rapid change of temperature, more terminal carboxyl hyperbranched polyester precipitates onto the surface of the PTT composite fiber along with the spinning and stretching process, so that the surface of the PTT composite fiber has more carboxyl groups. Then, through an amide reaction, polyhexamethylene biguanide hydrochloride can be successfully grafted. And the bonding effect of covalent bonds greatly enhances the binding force between polyhexamethylene biguanide hydrochloride and the PTT composite fiber. Not only does the PTT fiber show good antibacterial performance, but also after 100 times of washing with water, its antibacterial property hardly decreases, and the water resistance of the antibacterial performance is excellent.

[0007] Preferably, in the slice melting step, the mass ratio of the PTT slice to the terminal carboxyl hyperbranched polyester is 30:(1 - 3).

[0008] By adopting the above technical solution, when the addition amount of the terminal carboxyl hyperbranched polyester is too large, the strength of the PTT composite fiber is lower, but its antibacterial property is improved to a certain extent.

[0009] Preferably, the molecular weight of the terminal carboxyl hyperbranched polyester is 2600 - 12000.

[0010] By adopting the above technical solution, when the molecular weight of the terminal carboxyl hyperbranched polyester is within this range, the antibacterial property of the PTT composite fiber is optimal. First, when its molecular weight is larger, its polyester chain is longer, which can improve the compatibility with the system, make its precipitation rate moderate, and it is not easy to agglomerate on the fiber surface; when the molecular weight is too small, the precipitation is too fast, and the compatibility with the system is poor, resulting in agglomeration in the system and on the fiber surface, leading to uneven distribution of the antibacterial agent and a decrease in antibacterial property. Second, when its molecular weight is smaller, the part near the surface of the fiber has a higher content of polar molecular weight, resulting in the appearance of an interfacial layer inside the material, thus reducing the strength of the fiber. However, when its molecular weight is too large, it is prone to difficult precipitation and insufficient antibacterial performance.

[0011] Preferably, in the step of grafting the antibacterial agent, the acid-binding agent is triethylamine.

[0012] By adopting the above technical solution, triethylamine as the acid-binding agent has a good reaction effect and is easy to remove.

[0013] Preferably, the molecular weight of the polyhexamethylene biguanide hydrochloride is 1100 - 2500.

[0014] By adopting the above technical solution, the higher the degree of polymerization of the polyhexamethylene biguanide hydrochloride, the better its antibacterial property, and good antibacterial effects can be achieved within this range.

[0015] Preferably, in the slice drying step, the crystallization temperature of the PTT slice is 140 °C, the treatment time is 18 min, the drying temperature is 170 °C, and the time is 4 h; the drying temperature of the PET slice is 140 °C and the time is 5 h.

[0016] By adopting the above technical solution, under this drying condition, the moisture content of the PTT slice < 50 ppm, and the moisture content of the PET slice < 50 ppm.

[0017] Preferably, the content of the alkali weight reduction treatment is as follows: The crude antibacterial PTT composite fiber is added to a sodium hydroxide solution with a concentration of 15 - 25 g / L at 50 - 65°C, and the bath ratio is 1:(55 - 65). It is heated to 80 - 88°C at a heating rate of 1 - 3°C / min and kept warm for 50 - 90 min. Then it is washed with hot water at 60 - 75°C for 2 min, washed with water for 2 min, and then dried at 70 - 85°C to obtain the bio-based new material antibacterial PTT composite fiber.

[0018] In a second aspect, the present application provides a bio-based new material antibacterial PTT composite fiber, adopting the following technical solution: A bio-based new material antibacterial PTT composite fiber, wherein the PTT composite fiber is prepared by the production process of the bio-based new material antibacterial PTT composite fiber.

[0019] By adopting the above technical solution, the production process of the present application is relatively simple, the qualified rate of the prepared product is high, and it is suitable for mass production.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. Polyhexamethylene biguanide hydrochloride is an antibacterial agent with low biological toxicity, little harm to biological cells, and at the same time has broad-spectrum antibacterial properties. However, polyhexamethylene biguanide hydrochloride has good water solubility, and the binding force directly loaded on the fiber surface is weak. After washing with water, its antibacterial performance drops rapidly. In the present application, by adding terminal carboxyl hyperbranched polyester into the PTT composite fiber, due to the low viscosity of the hyperbranched polymer in the present application and the strong polarity of the terminal carboxyl hyperbranched polyester, the compatibility with the PTT composite fiber is insufficient. Therefore, during the spinning process, due to the rapid change of temperature, more terminal carboxyl hyperbranched polyester precipitates onto the surface of the PTT composite fiber during the spinning and stretching process, so that the surface of the PTT composite fiber has more carboxyl groups. Then, through an amide reaction, polyhexamethylene biguanide hydrochloride can be successfully grafted. And the bonding effect of covalent bonds greatly enhances the binding force between polyhexamethylene biguanide hydrochloride and the PTT composite fiber. Not only does the PTT fiber show good antibacterial performance, but also after 100 times of washing with water, its antibacterial property hardly decreases, and the water resistance of the antibacterial performance is excellent.

[0021] 2. The PTT composite fiber prepared in the present application has excellent antibacterial performance. Among them, through detection, the inhibition rate of Escherichia coli can reach 90.2% and above, and the highest can reach 99.7%. And after 100 times of washing with water, it can still reach 89.5% and above, and the highest can reach 99.4%. At the same time, the antibacterial rate of Staphylococcus aureus is between 96.0 - 99.9%, and after washing 100 times with water, it can still reach between 95.9 - 99.7%. Detailed implementation manners

[0022] The present application will be further described in detail below in conjunction with specific content.

[0023] Raw materials The raw materials used in the embodiments of the present application are all purchased commercially. Among them, PTT chips are purchased from Suzhou Suzhen Bioengineering Co., Ltd., PET chips are purchased from Hengli Petrochemical; polyhexamethylene biguanide hydrochloride is purchased from Xi'an Jinxiang Pharmaceutical Excipients Co., Ltd.

[0024] Example 1 A bio-based new material antibacterial PTT composite fiber, and its production process is as follows: S1. Chip drying: The PTT chips are subjected to pre-crystallization and drying treatment to remove moisture and improve crystallinity. Among them, the crystallization temperature of the PTT chips is 140 °C, the treatment time is 18 min, the drying temperature is 170 °C, and the time is 4 h. After the treatment, the crystallinity of the PTT chips is measured to be 35.2%, and the moisture content is <50 ppm; The PET chips are subjected to drying treatment to remove moisture. The drying temperature of the PET chips is 140 °C, and the time is 5 hours. After the treatment, the moisture content of the PET chips is measured to be <50 ppm; S2. Chip melting: The dried PTT chips and the carboxyl-terminated hyperbranched polyester are added to a hot melt extrusion device to form a PTT melt. The hot melt temperature of PTT in the hot melt extrusion device is 235 °C; among them, the mass ratio of the PTT chips to the carboxyl-terminated hyperbranched polyester is 30:1; among them, the model of the carboxyl-terminated hyperbranched polyester is HyPer C102, the molecular weight is 2600, and the number of carboxyl groups is 12 per mol; The dried PET chips are added to a hot melt extrusion device to form a PET melt. The hot melt temperature of PET is 265 °C; S3. Composite spinning: The hot-melted PTT melt and PET melt are respectively metered and transported by a metering pump to the spinneret plate of the spinning assembly for spinning to obtain a crude PTT composite fiber. The outer layer of the crude PTT composite fiber is a PTT fiber layer, and the inner layer is a PET core layer. After the composite fiber is stretched and heat-set in sequence, the internal stress is eliminated. The temperature of the metering pump and the spinneret holes on the spinneret plate for transporting and spinning the PTT melt is 260 °C, and the temperature of the metering pump and the spinneret holes on the spinneret plate for transporting and spinning the PET melt is 275 °C. The intrinsic viscosity of the PET melt is 0.55 dl / g, and the intrinsic viscosity of the PTT melt is 1.2 dl / g. The crude PTT composite fiber is prepared with a composite ratio of 40:60 by mass of the PET melt and the PTT melt. The breaking strength of the formed crude PTT composite fiber at a breaking elongation of 25% is 4.0 cn / dtex; S4. Grafting Antibacterial Agent: Immerse 100 g of the obtained crude PTT composite fiber in N,N-dimethylformamide. The mass ratio of the crude PTT composite fiber to the solvent is 1:3. Then add 5 g of the antibacterial agent polyhexamethylene biguanide hydrochloride, with an average molecular weight of 2000. Then add 0.5 g of EDCI, 0.35 g of HOBt, and 0.5 g of triethylamine. Stir and react at 30 °C for 2 h, filter and wash to obtain the crude antibacterial PTT composite fiber; S5. Alkali Weight Reduction Treatment: Add the crude antibacterial PTT composite fiber to a sodium hydroxide solution with a concentration of 20 g / L at 60 °C, with a bath ratio of 1:60. Heat it up to 85 °C at a heating rate of 2 °C / min and keep it warm for 60 min. Then wash it with hot water at 70 °C for 2 min and with normal temperature water for 2 min, and then dry it at 80 °C to obtain the antibacterial PTT composite fiber.

[0025] Example 2 A bio-based new material antibacterial PTT composite fiber, which is different from Example 1 in that in S3, the PET melt and the PTT melt are used to prepare the PTT composite fiber with a composite ratio of 45:55 by mass. The breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 4.3 cn / dtex, and the other steps are the same as those in Example 1.

[0026] Example 3 A bio-based new material antibacterial PTT composite fiber, which is different from Example 1 in that in S3, the PET melt and the PTT melt are used to prepare the PTT composite fiber with a composite ratio of 50:50 by mass. The breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 4.6 cn / dtex, and the other steps are the same as those in Example 1.

[0027] Example 4 A bio-based new material antibacterial PTT composite fiber, which is different from Example 2 in that in S2, the type of the carboxyl-terminated hyperbranched polyester is HyPer C103, with a molecular weight of 6400 and 24 carboxyl groups per mole. The breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 4.5 cn / dtex, and the other steps are the same as those in Example 2.

[0028] Example 5 A bio-based new material antibacterial PTT composite fiber, which is different from Example 2 in that in S2, the type of the carboxyl-terminated hyperbranched polyester is HyPer C104, with a molecular weight of 12000 and 48 carboxyl groups per mole. The breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 4.8 cn / dtex, and the other steps are the same as those in Example 2.

[0029] Example 6. A bio-based new material antibacterial PTT composite fiber, which is different from Example 4 in that in S2, the mass ratio of PTT chips to terminal carboxyl hyperbranched polyester is 30:2, and the breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 4.2 cn / dtex, and the remaining steps are the same as those in Example 4.

[0030] Example 7. A bio-based new material antibacterial PTT composite fiber, which is different from Example 4 in that in S2, the mass ratio of PTT chips to terminal carboxyl hyperbranched polyester is 30:3, and the breaking strength of the formed PTT composite fiber at a breaking elongation of 25% is 3.7 cn / dtex, and the remaining steps are the same as those in Example 4.

[0031] Comparative Example 1 A bio-based new material antibacterial PTT composite fiber, which is different from Example 4 in that in S2, the terminal carboxyl hyperbranched polyester is replaced with an equal mass of terminal carboxyl polyester resin with an average molecular weight of 6000, and the remaining steps are the same as those in Example 4.

[0032] Comparative Example 2 A bio-based new material antibacterial PTT composite fiber, which is different from Example 4 in that no terminal carboxyl hyperbranched polyester is added to the PTT melt, and the remaining steps are the same as those in Example 4.

[0033] Performance detection test Detection method / Test method Prepare bio-based new material antibacterial PTT composite fibers according to the production processes of Examples 1-7 and Comparative Examples 1-2 respectively, and then perform detection according to the antibacterial test method recorded in GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3 - Oscillation Method", and detect the antibacterial effect after 100 washes respectively. The detection results are shown in Table 1.

[0034] Table 1 Antibacterial performance detection results of Examples 1-7 and Comparative Examples 1-2

[0035] It can be seen from Examples 1-7, Comparative Examples 1-2, and the detection data in Table 1 that the PTT composite fiber prepared in this application has excellent antibacterial properties. Among them, through detection, the inhibition rate of Escherichia coli can reach 90.2% or more, and the highest can reach 99.7%. And after 100 washes, it can still reach 89.5% or more, and the highest can reach 99.4%. At the same time, the antibacterial rate of Staphylococcus aureus is between 96.0-99.9%. After 100 washes, it can still reach between 95.9-99.7%.

[0036] Polyhexamethylene biguanide hydrochloride is an antibacterial agent with low biological toxicity, little harm to biological cells, and broad-spectrum antibacterial properties. The guanidine group contained in its molecular structure has high activity, which can make the polymer positively charged and is easily adsorbed by various negatively charged bacteria and viruses, thereby inhibiting the splitting ability of bacteria and viruses and causing them to lose their reproductive ability. In addition, the film formed by the polymer blocks the respiratory channels of microorganisms, causing the microorganisms to die quickly. Polyhexamethylene biguanide hydrochloride is a broad-spectrum antibiotic that has a high killing effect on Gram-positive bacteria, Gram-negative bacteria, fungi, yeasts, etc. However, polyhexamethylene biguanide hydrochloride has good water solubility, and the binding force directly loaded on the fiber surface is weak. After washing with water, its antibacterial performance drops rapidly. In this application, by adding carboxyl-terminated hyperbranched polyester into the PTT composite fiber, due to the low viscosity of the hyperbranched polymer in this application and the strong polarity of the carboxyl-terminated hyperbranched polyester, the compatibility with the PTT composite fiber is insufficient. Therefore, during the spinning process, due to the rapid change in temperature, more carboxyl-terminated hyperbranched polyester precipitates onto the surface of the PTT composite fiber during the spinning and stretching process, resulting in more carboxyl groups on the surface of the PTT composite fiber. Then, through an amide reaction, polyhexamethylene biguanide hydrochloride can be successfully grafted. The covalent bonding makes the binding force between polyhexamethylene biguanide hydrochloride and the PTT composite fiber greatly enhanced. Not only does the PTT fiber show good antibacterial performance, but also after 100 washes with water, its antibacterial property hardly decreases, and the water resistance of the antibacterial performance is excellent. This can be verified by the test data of Example 4 and Comparative Example 2. Combining with Comparative Example 1, when the carboxyl-terminated hyperbranched polyester is replaced with a linear carboxyl-terminated polyester resin, its molecular viscosity is large, it is difficult to precipitate, and the amount of carboxyl groups contained is small, and the antibacterial performance of the prepared PTT fiber is poor; and more is loaded on the surface, and after washing with water, the antibacterial property drops significantly.

[0037] From the test data of Examples 1-3, it can be seen that when preparing PTT composite fibers, as the addition amount of PTT melt increases, the strength of PTT composite fibers shows a downward trend, but its antibacterial performance gradually improves. This is because the PTT melt contains more terminal carboxyl hyperbranched polyester, which can precipitate onto the fiber surface, making the fiber surface have more carboxyl groups and enabling bonding of more antibacterial agents. On the basis of Example 2, the molecular weight of the terminal carboxyl hyperbranched polyester was further explored. Combining Examples 4-5, when the molecular weight of the terminal carboxyl hyperbranched polyester is 6400, the antibacterial performance of its PTT composite fiber is optimal. One reason is that when its molecular weight is relatively large, its polyester chain is longer, which can improve its compatibility with the system, making its precipitation rate moderate and not prone to agglomeration on the fiber surface; when the molecular weight is too small, the precipitation is too fast, and its compatibility with the system is poor, resulting in agglomeration in the system and on the fiber surface, leading to uneven distribution of antibacterial agents and a decrease in antibacterial properties. The other reason is that when its molecular weight is relatively small, the part of the fiber close to the surface has a relatively high content of polar molecular weight, resulting in an interfacial layer inside the material, thus causing a decrease in the strength of the fiber. However, when its molecular weight is too large, it is prone to difficult precipitation and insufficient antibacterial performance.

[0038] From the test data of Examples 4 and 6-7, it can be seen that when the addition amount of the terminal carboxyl hyperbranched polyester is too large, the strength of its PTT composite fiber is lower, but its antibacterial property has a certain improvement.

[0039] This specific embodiment is only an interpretation of the present invention and not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A production process of a bio-based new material antibacterial PTT composite fiber, characterized in that: The PTT composite fiber is a composite fiber of PET and PTT, and its production process includes chip drying, chip melting, composite spinning, grafting antibacterial agent and alkali weight reduction treatment; Among them, the content of the chip melting is as follows: Add the dried PTT chips and terminal carboxyl hyperbranched polyester into the hot melt extrusion equipment to form a PTT melt. The hot melt temperature of PTT in the hot melt extrusion equipment is 230 - 245 °C; Add the dried PET chips into the hot melt extrusion equipment to form a PET melt. The hot melt temperature of PET is 260 - 270 °C; The content of the composite spinning is as follows: Respectively convey the PTT melt and the PET melt to the spinneret of the spinneret assembly through metering pumps for spinning to obtain crude PTT composite fibers. The outer layer of the crude PTT composite fiber is a PTT fiber layer, and the inner layer is a PET core layer. The temperature of the metering pump for conveying and spinning the PTT melt and the spinneret holes on the spinneret is 255 - 265 °C, and the temperature of the metering pump for conveying and spinning the PET melt and the spinneret holes on the spinneret is 270 - 280 °C; The content of the grafting antibacterial agent is as follows: Immerse 90 - 110 g of the obtained crude PTT composite fibers in a solvent, then add 4 - 6 g of polyhexamethylene biguanide hydrochloride, then add 0.4 - 0.6 g of EDCI, 0.3 - 0.45 g of HOBt and 0.4 - 0.6 g of acid-binding agent, stir and react, filter and wash to obtain crude antibacterial PTT composite fibers.

2. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: In the chip melting step, the mass ratio of the PTT chips to the terminal carboxyl hyperbranched polyester is 30:(1 - 3).

3. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: The molecular weight of the terminal carboxyl hyperbranched polyester is 2600 - 12000.

4. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: In the step of grafting antibacterial agent, the acid-binding agent is triethylamine.

5. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: The molecular weight of the polyhexamethylene biguanide hydrochloride is 1100 - 2500.

6. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: In the chip drying step, the crystallization temperature of the PTT chips is 140 °C, the treatment time is 18 min, the drying temperature is 170 °C, and the time is 4 h; the drying temperature of the PET chips is 140 °C and the time is 5 hours.

7. The production process of a bio-based new material antibacterial PTT composite fiber according to claim 1, characterized in that: The content of the alkali weight reduction treatment is as follows: Add the crude antibacterial PTT composite fibers into a sodium hydroxide solution with a concentration of 15 - 25 g / L at 50 - 65 °C, with a bath ratio of 1:(55 - 65), heat up at a rate of 1 - 3 °C / min to 80 - 88 °C, keep warm for 50 - 90 min, then wash it with hot water at 60 - 75 °C for 2 min, wash it with water for 2 min, and then dry it at 70 - 85 °C to obtain a bio-based new material antibacterial PTT composite fiber.

8. A bio-based new antibacterial PTT composite fiber, characterized in that: The PTT composite fiber is prepared by the production process of the bio-based new material antibacterial PTT composite fiber according to any one of claims 1 - 7.

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