Environment-friendly regenerated polyester antibacterial and deodorant bulky yarn and preparation method thereof

Abstract

The application discloses an environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn, and a preparation method thereof. The preparation raw materials of the bulk yarn include the following components in parts by weight: 100-200 parts of recycled waste polyester, 0.5-5 parts of an antibacterial agent, 0.2-0.4 parts of a stabilizer and 0.2-0.4 parts of an antioxidant. The method comprises the following steps: S1, removing water and oxygen from the recycled waste polyester to obtain waste polyester raw materials; S2, alcoholysis is performed on the waste polyester raw materials in step S1, and a depolymerization solution is obtained after filtration; S3, the antibacterial agent is added into the depolymerization solution in a weight ratio and stirred uniformly, then the stabilizer and the antioxidant are added into the depolymerization solution and stirred uniformly, and finally the mixed raw materials are added into a polymerization kettle to perform three processes of pre-polycondensation, polycondensation and final polycondensation, so as to obtain regenerated polyester raw materials; and S4, spinning is performed on the regenerated polyester raw materials on a spinning machine to obtain a regenerated polyester antibacterial and deodorizing bulk yarn. The prepared bulk yarn has excellent antibacterial property, realizes the economic benefits of polyester materials, and the obtained bulk yarn also has good flexibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of D02G3 / 00, and particularly relates to an environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn and a preparation method thereof. BACKGROUND

[0002] The raw material of the regenerated polyester fiber is waste polyester bottle pieces and waste polyester textile scraps. The preparation of the regenerated polyester fiber realizes reasonable reuse of the waste polyester fiber, improves resource utilization rate, and avoids pollution to the environment. Since the raw material of the regenerated polyester fiber is waste raw material, the fiber made of the raw material is susceptible to infection by bacteria, which limits the application range of the fiber.

[0003] Chinese patent CN106120021A discloses a polyester fiber with antibacterial and deodorizing health care functions and a preparation method thereof, and belongs to the polyester fiber field. The polyester fiber has a skin-core structure, the core layer of the skin-core structure is made of polyester, and the periphery of the core layer is surrounded by polyvinyl alcohol-ethylene copolymer to form the skin layer of the skin-core structure. The polyvinyl alcohol-ethylene copolymer is connected with polymethyl methacrylate dimethylaminoethyl ester outward along the radial direction of the skin-core structure, the polymethyl methacrylate dimethylaminoethyl ester is complexed with divalent copper ions to form an antibacterial layer of the polyester fiber, and the end of the polymethyl methacrylate dimethylaminoethyl ester is connected with polyethylene glycol to form a skin-friendly and hydrophilic layer on the surface of the polyester fiber. However, the antibacterial property is not good enough.

[0004] Chinese patent CN111116795A discloses a method for producing an antibacterial polyester material. The method copolymerizes polymer monomers and monomers with antibacterial groups to obtain a polyester material. By changing the physical and chemical properties of the material surface, the formation of bacterial biofilms can be prevented from the source. However, the production cost of this method is high, the process is complex, and the product quality is unstable.

[0005] Chinese patent CN202010257061.1 discloses a polyester film with surface antibacterial property. The product is used in places where people's hands are easily contacted, such as touch screens in elevators, to achieve good antibacterial effect. However, the disadvantage of this method is that the antibacterial effect will gradually weaken with the use of the product. SUMMARY

[0006] To solve the above problems, the present application discloses an environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn. The preparation raw material of the bulk yarn includes, by weight, 100-200 parts of recycled waste polyester, 0.5-5 parts of antibacterial agent, 0.2-0.4 parts of stabilizer, and 0.2-0.4 parts of antioxidant.

[0007] Preferably, the preparation raw material of the bulk yarn includes 150 parts of recycled waste polyester, 2.1 parts of antibacterial agent, 0.25 parts of stabilizer, and 0.33 parts of antioxidant.

[0008] Preferably, the recycled waste polyester is selected from one or more of polyester pulp, polyester bottle flake, polyester fiber and polyester waste yarn.

[0009] Further preferably, the recycled waste polyester is a mixture of polyester pulp, polyester bottle flake, polyester fiber and polyester waste yarn.

[0010] Preferably, the weight ratio of the polyester pulp, polyester bottle flake, polyester fiber and polyester waste yarn is (1-5):2:1:2.

[0011] Preferably, the antibacterial agent is selected from one or more of organic antibacterial agent and inorganic antibacterial agent.

[0012] Further preferably, the antibacterial agent is selected from one or more of quaternary ammonium salt antibacterial agent, biguanide antibacterial agent, phenolic antibacterial agent.

[0013] Preferably, the antibacterial agent is selected from quaternary ammonium salt antibacterial agent and biguanide antibacterial agent, and the weight ratio is 1:1.

[0014] Further preferably, the quaternary ammonium salt antibacterial agent is selected from one or more of dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide, polyquaternary ammonium salt.

[0015] Preferably, the quaternary ammonium salt antibacterial agent is dodecyl dimethyl benzyl ammonium chloride.

[0016] Preferably, the biguanide antibacterial agent is selected from one or more of polyhexamethylene biguanide hydrochloride, polyhexamethylene biguanide, polyaminopropyl biguanide hydrochloride, polyhexamethylene guanidine phosphate.

[0017] Further preferably, the biguanide antibacterial agent is polyaminopropyl biguanide hydrochloride.

[0018] Preferably, the pH value of the polyaminopropyl biguanide hydrochloride is 4.0-6.0.

[0019] Further preferably, the pH value of the polyaminopropyl biguanide hydrochloride is 5.0-5.5.

[0020] Preferably, the polyaminopropyl biguanide biguanide hydrochloride has a CAS number of 133029-332-0.

[0021] Preferably, the stabilizer is one or both of triphenyl phosphate and triphenyl phosphite.

[0022] Further preferably, the stabilizer is triphenyl phosphate.

[0023] Preferably, the antioxidant is selected from one or both of antioxidant 1010 and antioxidant 168.

[0024] Preferably, the antioxidant is antioxidant 168, available from Nanjing Milan Chemical Co., Ltd.

[0025] In one embodiment, the application also discloses a preparation method of the environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn, which comprises the following steps:

[0026] S1: removing water and oxygen from the recycled waste polyester to obtain waste polyester raw material.

[0027] S2: alcoholysis of the waste polyester raw material in step S1, and filtering to obtain a depolymerization liquid.

[0028] S3: adding an antibacterial agent into the depolymerization liquid in a weight ratio, stirring uniformly, then adding a stabilizer and an antioxidant into the depolymerization liquid, stirring uniformly, and then adding the mixed raw material into a polymerization kettle to perform three processes of pre-polycondensation, polycondensation and final polycondensation, to obtain regenerated polyester raw material.

[0029] S4: spinning the regenerated polyester raw material on a spinning machine to obtain regenerated polyester antibacterial and deodorizing bulk yarn.

[0030] In the prior art, polyester materials are applied to the packaging of various chemical substances. In the recycling process, due to the complex types of residual chemical substances, the reaction in the alcoholysis process is not sufficient. In order to make the alcoholysis reaction more sufficient, the present applicant has carried out a large number of single-factor experiments, and found that only the alcohol compound is dihydric alcohol, and when the weight ratio of ethylene glycol and 1,4-butanediol in dihydric alcohol is 1:1, the concentration of terephthalic acid ethylene glycol ester obtained after polyester alcoholysis is the highest, thereby improving the flexibility of the subsequent bulk yarn.

[0031] Preferably, the step S2 specifically comprises: putting the waste polyester raw material and the alcohol compound into a depolymerization reactor in a weight ratio of 1:(1-2), and using a catalyst to perform a 3-5h depolymerization reaction at 200-240℃ to obtain a depolymerization product containing terephthalic acid ethylene glycol ester; and filtering the prepared depolymerization liquid through a filtering device to obtain a high-purity depolymerization liquid.

[0032] Further preferably, the step S2 specifically comprises: putting the waste polyester raw material and the alcohol compound into a depolymerization reactor in a weight ratio of 1:1.5, and using a catalyst to perform a 4.2h depolymerization reaction at 235℃ to obtain a depolymerization product containing terephthalic acid ethylene glycol ester; and filtering the prepared depolymerization liquid through a filtering device to obtain a high-purity depolymerization liquid.

[0033] Preferably, the alcohol compound is selected from one or both of monohydric alcohol and dihydric alcohol.

[0034] Further preferably, the alcohol compound is dihydric alcohol.

[0035] Preferably, the dihydric alcohol is selected from one or more of ethylene glycol, propylene glycol, 1,4-butanediol, and triethylene glycol.

[0036] Preferably, the dihydric alcohol is ethylene glycol and 1,4-butanediol in a weight ratio of 1:1.

[0037] Preferably, the reaction conditions of the polymerization kettle in step S3 are as follows: the reaction temperature of pre-polycondensation is 245-255℃, the vacuum degree is 10-20KPa, the residence time is 1.5-2.5 hours, the reaction temperature of polycondensation is 278-285℃, the vacuum degree is 1-5KPa, the residence time is 1-2.5 hours; the final polycondensation reaction temperature is 281-297℃, the vacuum degree is 0.09-1KPa, and the reaction time is 3-4 hours.

[0038] Further preferably, the reaction conditions of the polymerization kettle in step S3 are as follows: the reaction temperature of pre-polycondensation is 250℃, the vacuum degree is 16KPa, the residence time is 2 hours, the reaction temperature of polycondensation is 280℃, the vacuum degree is 2.5KPa, the residence time is 2 hours; the final polycondensation reaction temperature is 280℃, the vacuum degree is 0.48KPa, and the reaction time is 3.5 hours.

[0039] The method of in-situ polymerization is used to endow the regenerated polyester with broad-spectrum antibacterial effect by using quaternary ammonium salt and biguanide antibacterial agent; meanwhile, the long-chain molecules of the biguanide antibacterial agent are combined with other components through hydrogen bonding, so that the flexibility of the bulked yarn spun out is further enhanced.

[0040] Preferably, the spinning machine is a three-screw BCF spinning machine.

[0041] In the prior art, the preparation of antibacterial fibers is usually to mix the antibacterial agent with other raw materials, and then to perform ordinary spinning operation, but the antibacterial agent will precipitate over time, and the antibacterial ability will decrease. The bulking process of the three-screw BCF spinning machine set can fully mix the raw materials, form high three-dimensional crimping, and provide the necessary conditions for forming the antibacterial fiber network. The network process produces local close contact nodes in the fiber extension direction, which constitutes the antibacterial synergistic point, can delay the precipitation of the antibacterial agent, and the internal antibacterial agent will continuously migrate to the surface, realizing the long-term antibacterial ability. The production process is simple, practical, and efficient.

[0042] Preferably, the operation conditions in step S4 are as follows: melt extrusion through a screw, cooling, oiling, stretching, and deformation.

[0043] Further preferably, the extrusion temperature is 265-285℃; the cooling is side air cooling, the temperature is 22±1℃, the humidity is 70%, and the wind speed is 0.5-0.75m / s.

[0044] Preferably, the extrusion temperature is 280℃; the cooling is side air cooling, the temperature is 22℃, the humidity is 70%, and the air speed is 0.65m / s.

[0045] Preferably, the oiling oil is German BCF oil, the oil wheel rotation speed is 25±2r / min, and the oiling rate is 0.8-1.0%.

[0046] Preferably, the first hot rod speed of the drawing deformation is 600-710m / min, the temperature is 90±5℃; the second hot rod speed is 620-730m / min, the temperature is 110±5℃, the drafting roller speed is 2500-2900m / min, the temperature is 160±5℃, the deformation temperature is 160±5℃, the cooling disc rotation speed is 27±2r / min, the first adjusting roller speed is 2280-2500m / min, and the second adjusting roller speed is 2300-2550m / min.

[0047] Further preferably, the first hot rod speed of the drawing deformation is 660m / min, the temperature is 88℃; the second hot rod speed is 680m / min, the temperature is 108℃, the drafting roller speed is 2600m / min, the temperature is 162℃, the deformation temperature is 162℃, the cooling disc rotation speed is 25r / min, the first adjusting roller speed is 2280m / min, and the second adjusting roller speed is 2300m / min.

[0048] Preferably, the winding speed is 2320m / min.

[0049] Preferably, the bulked yarn single fiber density range is 15-20dtex, and the corresponding polyester fiber diameter is 35-45μm.

[0050] Further preferably, the bulked yarn single fiber density range is 18dtex, and the corresponding polyester fiber diameter is 40μm.

[0051] Beneficial effects:

[0052] 1. The prepared bulked yarn has excellent antibacterial property, and due to the linkage of internal hydrogen bonds, the bulked yarn has good flexibility during washing and is not easily washed off, so that the antibacterial property of the bulked yarn remains unchanged even after multiple washes.

[0053] 2. Through alcoholysis, polymerization and spinning of regenerated polyester, efficient recycling of waste polyester materials can be realized, and the economic benefits of polyester materials are improved.

[0054] 3. By adding quaternary ammonium salt and biguanide antibacterial agents, the bulked yarn has certain antibacterial property, and through the action of intermolecular hydrogen bonds, the bulked yarn has good flexibility.

[0055] 4. By adding stabilizers and antioxidants in the condensation stage, and strictly controlling the temperature and time of the condensation reaction, the bulk yarn can have better tensile strength.

[0056] 5. The application uses waste polyester to develop antibacterial materials, which can effectively alleviate the current white pollution problem of waste polyester, greatly reduce oil consumption and energy consumption, has obvious green product characteristics, and has the advantages of preventing environmental pollution, energy saving and emission reduction and strong environmental protection benefits. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the application will be described below in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0058] Embodiment 1

[0059] The embodiment 1 discloses an environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn, and the preparation raw materials of the bulk yarn include, by weight: 100 parts of recycled waste polyester, 0.5 parts of antibacterial agent, 0.2 parts of stabilizer, and 0.2 parts of antioxidant.

[0060] The recycled waste polyester is a mixture of polyester slurry, polyester bottle pieces, polyester fibers and polyester waste silk.

[0061] The weight ratio of the polyester slurry, the polyester bottle pieces, the polyester fibers and the polyester waste silk is 1:2:1:2.

[0062] The antibacterial agent is selected from quaternary ammonium salt antibacterial agent and biguanide antibacterial agent, and the weight ratio is 1:1.

[0063] The quaternary ammonium salt antibacterial agent is dodecyl dimethyl benzyl ammonium chloride.

[0064] The biguanide antibacterial agent is polyaminopropyl biguanide hydrochloride.

[0065] The pH value of the polyaminopropyl biguanide hydrochloride is 5.0-5.5.

[0066] The polyaminopropyl biguanide hydrochloride has a CAS number of 133029-332-0.

[0067] The stabilizer is triphenyl phosphate.

[0068] The antioxidant is antioxidant 168, which is purchased from Nanjing Milan Chemical Co., Ltd.

[0069] The embodiment 1 further discloses a preparation method of the environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn, and the method comprises the following steps:

[0070] S1: removing water and oxygen from the recycled waste polyester; obtaining waste polyester raw material.

[0071] S2: alcoholysis of the waste polyester raw material in step S1, and obtaining depolymerization liquid after filtration.

[0072] S3: adding antibacterial agent into the depolymerization liquid in a weight ratio, stirring uniformly, then adding stabilizer and antioxidant into the depolymerization liquid, stirring uniformly, and then adding the mixed raw material into a polymerization kettle to perform pre-polycondensation, polycondensation and final polycondensation processes, obtaining regenerated polyester raw material.

[0073] S4: spinning the regenerated polyester raw material on a spinning machine to obtain regenerated polyester antibacterial and deodorizing bulk body.

[0074] The step S2 specifically comprises: putting the waste polyester raw material and alcohol compound into a depolymerization kettle in a weight ratio of 1:1, using a catalyst to perform 3h depolymerization reaction at 200℃, obtaining depolymerization product containing ethylene terephthalate; and preparing the depolymerization liquid through a filtering device to obtain high-purity depolymerization liquid.

[0075] The alcohol compound is dihydric alcohol, and the dihydric alcohol is ethylene glycol and 1,4-butanediol in a weight ratio of 1:1.

[0076] The reaction conditions of the polymerization kettle in step S3 are as follows: the reaction temperature of pre-polycondensation is 245℃, the vacuum degree is 10KPa, and the residence time is 1.5 hours; the reaction temperature of polycondensation is 278℃, the vacuum degree is 1KPa, and the residence time is 1 hour; and the reaction temperature of final polycondensation is 281℃, the vacuum degree is 0.09KPa, and the reaction time is 3 hours.

[0077] The spinning machine is a three-screw BCF spinning machine.

[0078] The operation conditions of spinning in step S4 are as follows: melt extrusion, cooling, oiling, stretching and deformation through the spinning machine.

[0079] The extrusion temperature is 280℃; the cooling is side air cooling, the temperature is 22℃, the humidity is 70%, and the wind speed is 0.7m / s.

[0080] The oil agent for oiling is German BCF oil agent; the oil wheel rotation speed is 24r / min, and the oiling rate is 0.85%.

[0081] The first hot rod speed is 600 m / min, the temperature is 90℃; the second hot rod speed is 620 m / min, the temperature is 110℃, the drafting roller speed is 2550 m / min, the temperature is 170℃, the deformation temperature is 165℃, the cooling disc rotation speed is 27 r / min, the first adjusting roller speed is 2280 m / min, and the second adjusting roller speed is 2300 m / min.

[0082] The winding speed is 2320 m / min.

[0083] The bulk yarn single fiber density ranges from 20 dtex, and the corresponding polyester fiber diameter is 45 μm.

[0084] Embodiment 2

[0085] The embodiment 2 discloses an environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn. The preparation raw materials of the bulk yarn include, by weight, 200 parts of recycled waste polyester, 5 parts of antibacterial agent, 0.4 parts of stabilizer, and 0.4 parts of antioxidant.

[0086] The recycled waste polyester is a mixture of polyester slurry, polyester bottle pieces, polyester fibers, and polyester waste silk.

[0087] The weight ratio of the polyester slurry, the polyester bottle pieces, the polyester fibers, and the polyester waste silk is 5:2:1:2.

[0088] The antibacterial agent is selected from quaternary ammonium salt antibacterial agent and biguanide antibacterial agent, and the weight ratio is 1:1.

[0089] The quaternary ammonium salt antibacterial agent is dodecyl dimethyl benzyl ammonium chloride.

[0090] The biguanide antibacterial agent is polyaminopropyl biguanide hydrochloride.

[0091] The pH value of the polyaminopropyl biguanide hydrochloride is 5.0-5.5.

[0092] The polyaminopropyl biguanide hydrochloride has a CAS number of 133029-332-0.

[0093] The stabilizer is triphenyl phosphate.

[0094] The antioxidant is antioxidant 168, which is purchased from Nanjing Milan Chemical Co., Ltd.

[0095] The embodiment 2 further discloses a preparation method of the environment-friendly regenerated polyester antibacterial and deodorizing bulk yarn, and the method includes the following steps.

[0096] S1: removing water and oxygen from the recycled waste polyester to obtain waste polyester raw materials.

[0097] S2: the waste polyester raw material in step S1 is subjected to alcoholysis, and a depolymerization liquid is obtained after filtration.

[0098] S3: an antibacterial agent is added into the depolymerization liquid in a weight ratio, and then a stabilizer and an antioxidant are added into the depolymerization liquid and stirred uniformly, and then the mixed raw material is added into a polymerization kettle to perform a pre-polycondensation, a polycondensation and a final polycondensation process, and a regenerated polyester raw material is obtained.

[0099] S4: the regenerated polyester raw material is subjected to spinning on a spinning machine, and a regenerated polyester antibacterial and deodorizing bulk body is obtained.

[0100] The step S2 specifically comprises: the waste polyester raw material and an alcohol compound are put into a depolymerization kettle in a weight ratio of 1:2, a catalyst is used to perform a 5h depolymerization reaction at 240 DEG C, a depolymerization product containing ethylene terephthalate is obtained, and the prepared depolymerization liquid is filtered through a filtering device to obtain a high-purity depolymerization liquid.

[0101] The alcohol compound is a dihydric alcohol, and the dihydric alcohol is ethylene glycol and 1,4-butanediol in a weight ratio of 1:1.

[0102] The reaction conditions of the polymerization kettle in the step S3 are as follows: the reaction temperature of the pre-polycondensation is 255 DEG C, the vacuum degree is 20 KPa, and the residence time is 2.5 hours; the reaction temperature of the polycondensation is 285 DEG C, the vacuum degree is 5 KPa, and the residence time is 2.5 hours; and the reaction temperature of the final polycondensation is 297 DEG C, the vacuum degree is 1 KPa, and the reaction time is 4 hours.

[0103] The spinning machine is a three-screw BCF spinning machine.

[0104] The operation conditions of the spinning in the step S4 are as follows: melt extrusion, cooling, oiling, stretching and deformation are performed on the spinning machine.

[0105] The extrusion temperature is 275 DEG C; the cooling is side-blowing air cooling, the temperature is 23 DEG C, the humidity is 70%, and the air speed is 0.65 m / s.

[0106] The oil agent for the oiling is a German BCF oil agent, the oil wheel rotation speed is 24 r / min, and the oiling rate is 0.9%.

[0107] The first hot roll speed for the stretching and deformation is 710 m / min, and the temperature is 85 DEG C; the second hot roll speed is 730 m / min, the temperature is 105 DEG C, the drafting roll speed is 2850 m / min, the temperature is 160 DEG C, the deformation temperature is 160 DEG C, the cooling disc rotation speed is 27 r / min, the first adjusting roll speed is 2480 m / min, and the second adjusting roll speed is 2500 m / min.

[0108] The winding speed is 2550 m / min.

[0109] The single fiber density of the bulked yarn is 15 dtex, and the corresponding polyester fiber diameter is 35 μm.

[0110] Embodiment 3

[0111] The embodiment 3 discloses an environment-friendly regenerated polyester antibacterial and deodorizing bulked yarn. The raw materials for preparing the bulked yarn include, by weight, 150 parts of recycled waste polyester, 2.1 parts of antibacterial agent, 0.25 parts of stabilizer, and 0.33 parts of antioxidant.

[0112] The recycled waste polyester is a mixture of polyester slurry, polyester bottle pieces, polyester fibers, and polyester waste silk.

[0113] The weight ratio of the polyester slurry, polyester bottle pieces, polyester fibers, and polyester waste silk is 5:2:1:2.

[0114] The antibacterial agent is selected from quaternary ammonium salt antibacterial agent and biguanide antibacterial agent, and the weight ratio is 1:1.

[0115] The quaternary ammonium salt antibacterial agent is dodecyl dimethyl benzyl ammonium chloride.

[0116] The biguanide antibacterial agent is polyaminopropyl biguanide hydrochloride.

[0117] The pH value of the polyaminopropyl biguanide hydrochloride is 5.0-5.5.

[0118] The polyaminopropyl biguanide hydrochloride has a CAS number of 133029-332-0.

[0119] The stabilizer is triphenyl phosphate.

[0120] The antioxidant is antioxidant 168, which is purchased from Nanjing Milan Chemical Co., Ltd.

[0121] The embodiment 3 also discloses a preparation method of the environment-friendly regenerated polyester antibacterial and deodorizing bulked yarn, which comprises the following steps:

[0122] S1: removing water and oxygen from the recycled waste polyester to obtain waste polyester raw material.

[0123] S2: alcoholysis is performed on the waste polyester raw material in step S1, and a depolymerization solution is obtained after filtration.

[0124] S3: the antibacterial agent is added to the depolymerization solution in a weight ratio, and then the stabilizer and the antioxidant are added to the depolymerization solution and stirred uniformly, and then the mixed raw materials are added to a polymerization kettle to perform pre-polycondensation, polycondensation, and final polycondensation processes to obtain regenerated polyester raw material.

[0125] S4: spinning is performed on the regenerated polyester raw material on a spinning machine to obtain regenerated polyester antibacterial and deodorizing bulked yarn.

[0126] The step S2 is specifically: the waste polyester raw material and the alcohol compound are put into a depolymerization reactor at a weight ratio of 1:1.5, and a depolymerization reaction is carried out at 235 DEG C for 4.2 h using a catalyst to obtain a depolymerization product containing terephthalate glycol; the prepared depolymerization liquid is filtered by a filtering device to obtain a high-purity depolymerization liquid.

[0127] The alcohol compound is a dihydric alcohol, and the dihydric alcohol is ethylene glycol and 1,4-butanediol at a weight ratio of 1:1.

[0128] The reaction conditions of the polymerization reactor in the step S3 are as follows: the pre-polycondensation reaction temperature is 250 DEG C, the vacuum degree is 16 KPa, and the residence time is 2 h; the polycondensation reaction temperature is 280 DEG C, the vacuum degree is 2.5 KPa, and the residence time is 2 h; and the final polycondensation reaction temperature is 280 DEG C, the vacuum degree is 0.48 KPa, and the reaction time is 3.5 h.

[0129] The spinning machine is a three-screw BCF spinning machine.

[0130] The operation conditions of the spinning in the step S4 are as follows: melt extrusion, cooling, oiling, stretching and deformation by the spinning machine.

[0131] The spinning machine is a three-screw BCF spinning machine.

[0132] The extrusion temperature is 280 DEG C; the cooling is side air cooling, the temperature is 23 DEG C, the humidity is 70%, and the air speed is 0.65 m / s.

[0133] The oiling agent is a German BCF oil agent, the oil wheel rotation speed is 24 r / min, and the oiling rate is 0.85%.

[0134] The first hot rod speed in the stretching and deformation is 660 m / min, and the temperature is 88 DEG C; the second hot rod speed is 680 m / min, the temperature is 108 DEG C, the drafting roller speed is 2600 m / min, the temperature is 162 DEG C, the deformation temperature is 162 DEG C, the cooling disc rotation speed is 26 r / min, the first adjusting roller speed is 2280 m / min, and the second adjusting roller speed is 2300 m / min.

[0135] The winding speed is 2320 m / min.

[0136] The bulked yarn single fiber density ranges from 18 dtex, and the corresponding polyester fiber diameter is 40 mu m.

[0137] Comparative Example 1

[0138] The antibacterial agent is a mixture of cuprous oxide and nano-silver at a weight ratio of 1:1, and the rest is the same as in Example 3.

[0139] Comparative Example 2

[0140] The alcohol compound is propylene glycol and 1,4-butanediol, and the weight ratio is 1:1; the rest is the same as example 3.

[0141] Comparative example 3

[0142] The first hot rod speed of the tensile deformation is 650 m / min, and the temperature is 85℃; the second hot rod speed is 670 m / min, and the temperature is 108℃, the drafting roller speed is 2600 m / min, and the temperature is 162℃, the deformation temperature is 165℃, the cooling disc rotation speed is 26 r / min, the first adjusting roller speed is 2300 m / min, and the second adjusting roller speed is 2320 m / min. The rest is the same as example 3.

[0143] Performance tests

[0144] 1. The bulked yarn prepared by examples 1-3 and comparative examples 1-3 is subjected to performance test of antibacterial property and breaking strength according to DB35 / T1058-2019 "General technical conditions for antibacterial polyester filaments", and the results are recorded in table 1.

[0145] Table 1

[0146]

[0147] It can be seen from the above performance test that the types of antibacterial agent and alcohol compound have a great influence on the antibacterial property and breaking strength of the bulked yarn.

Claims

1. An environmentally friendly recycled polyester antibacterial and deodorizing bulky yarn, characterized in that, By weight, the raw materials for preparing the bulky yarn include: 100-200 parts recycled waste polyester, 0.5-5 parts antibacterial agent, 0.2-0.4 parts stabilizer, and 0.2-0.4 parts antioxidant; The recycled waste polyester is a mixture of polyester slurry, polyester flakes, polyester fibers and waste polyester filaments; The weight ratio of the polyester slurry, polyester flakes, polyester fiber, and polyester waste filament is (1-5):2:1:2; The antibacterial agent is selected from quaternary ammonium salt antibacterial agents and biguanide antibacterial agents, with a weight ratio of 1:1; The quaternary ammonium salt antibacterial agent is dodecyl dimethyl benzyl ammonium chloride; The biguanide antibacterial agent is polyurethane-propyl biguanide hydrochloride; The stabilizer is triphenyl phosphate; The method for preparing the bulky yarn includes the following steps: S1: The recycled waste polyester is dehydrated and deoxygenated to obtain waste polyester raw materials; S2: The waste polyester raw material in step S1 is alcoholized and filtered to obtain a depolymerization solution; S3: Add the antibacterial agent to the depolymerization liquid by weight ratio and stir evenly. Then add the stabilizer and antioxidant to the depolymerization liquid and stir evenly. Then add the mixed raw materials to the polymerization kettle for three processes: pre-condensation, condensation, and final condensation to obtain recycled polyester raw materials. S4: Spin the recycled polyester raw material on a spinning machine to obtain recycled polyester antibacterial and deodorizing bulk material; Step S2 specifically involves: adding waste polyester raw materials and alcohol compounds into a depolymerization reactor at a weight ratio of 1:(1-2), and performing a depolymerization reaction at 200-240℃ using a catalyst for 3-5 hours to obtain a depolymerized product containing ethylene terephthalate; the prepared depolymerization solution is then filtered to obtain a high-purity depolymerization solution. The alcohols are diols, specifically ethylene glycol and 1,4-butanediol, in a weight ratio of 1:

1.

2. The bulky yarn according to claim 1, characterized in that, The antioxidant is selected from one or both of antioxidant 1010 and antioxidant 168.

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