PPC spun yarn and preparation method and application thereof

Abstract

The invention relates to the technical field of spinning, in particular to PPC spun yarn and a preparation method and application thereof. The PPC spun yarn is prepared from, by weight, 60-100 parts of PPC, 15-90 parts of polylactic acid, 3-5 parts of maleic anhydride grafted polyethylene, 1-3 parts of polyvinyl alcohol, 0.5-1 part of maleic anhydride and 0.1-0.2 part of initiator, and the PPC spun yarn has the advantages of being more excellent in mechanical property and better in dyeing effect.

Description

Technical Field

[0001] This invention relates to the field of spinning technology, specifically to a PPC spinning method and its application. Background Technology

[0002] Polypropylene carbonate (PPC), also known as polymethyl ethylene carbonate, is a biodegradable and environmentally friendly material synthesized from carbon dioxide and propylene oxide. It possesses good biocompatibility, extremely low oxygen permeability, excellent ductility and processability, making it a biodegradable plastic with significant industrial potential. PPC can fix up to 42 wt% CO2, thus it can absorb and utilize large amounts of industrial waste CO2, potentially partially replacing traditional petrochemical-based plastics. Therefore, it is also an environmentally friendly material with great development prospects.

[0003] Polymeric polycarbonate (PPC) is a typical amorphous polymer with highly flexible molecular chains and weak intermolecular forces. Its glass transition temperature (Tg) is relatively low, typically between 30-40°C. The mechanical properties of PPC decrease significantly with increasing temperature, and it is also prone to degradation during thermal processing, greatly limiting its applications. Blending PPC with other biodegradable copolymers, such as polyhydroxybutyrate (PHB), polybutylene succinate (PBS), cellulose acetate butyrate (CAB), and natural polymers, while maintaining its complete biodegradability, has become a major research focus both domestically and internationally.

[0004] Chinese Patent Publication No. CN115182071A discloses a TPU-PPC composite fiber and its preparation method, comprising the following steps: S1. Dissolving TPU and PPC in a heated mixed organic solvent to obtain a spinning solution; the mixed organic solvent includes N,N-dimethylformamide and tetrahydrofuran. S2. Electrospinning the spinning solution to obtain the TPU-PPC composite fiber. The TPU-PPC composite fiber addresses the poor mechanical properties of PPC to some extent, but its biodegradability decreases.

[0005] Polylactic acid (PLA), besides being biodegradable, also possesses good transparency, heat resistance, chemical stability, and thermoplasticity, making it suitable for packaging materials, fibers, and nonwovens. However, it suffers from drawbacks such as poor toughness, unsatisfactory processing stability and barrier properties, and high raw material costs. While there are reports on the preparation of composite materials by blending PPC and PLA through solution or melt methods, research on the reactive blending of the two through melt spinning with the addition of relevant auxiliaries to prepare high-performance, fully biodegradable blended fibers is relatively limited.

[0006] Chinese Patent Publication No. CN120383815A discloses a PLA / PPC biodegradable spinning material and its preparation method. The PLA / PPC biodegradable spinning material, by weight, comprises the following raw materials: 65-75 parts of end-capped polypropylene carbonate, 15-20 parts of polylactic acid, 1-2 parts of epoxidized soybean oil, 7-10 parts of composite Na-montmorillonite, 3-5 parts of light calcium carbonate, 6-9 parts of rice straw fiber, 0.6-0.8 parts of crosslinking agent, 0.2-0.5 parts of antioxidant, 1-2 parts of maleic anhydride-grafted PLA compatibilizer, 0.07-0.01 parts of catalyst, and 0.3-0.5 parts of silicone. The mixing of various raw materials in this spinning material improves its mechanical properties, giving it a certain strength and toughness, but further improvements are needed. Furthermore, its raw material composition is relatively complex, and the effect of the prepared spun yarn after dyeing also needs further improvement.

[0007] Therefore, it is essential to develop a PPC spinning method and its application that can solve the above-mentioned technical problems. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a PPC spinning method and application with better mechanical properties and dyeing effect.

[0009] This invention is achieved through the following technical solutions: The first aspect of the present invention provides a PPC spinning method, wherein the raw materials for preparation, by weight, include 60-100 parts PPC, 15-90 parts polylactic acid, 3-5 parts maleic anhydride-grafted polyethylene, 1-3 parts polyvinyl alcohol, 0.5-1 parts maleic anhydride and 0.1-0.2 parts initiator.

[0010] In one embodiment of the present invention, the initiator includes at least one of benzoyl peroxide and dicumyl peroxide.

[0011] As one embodiment of the present invention, the raw materials for preparing PPC spinning also include at least one of polypropylene glycol diglycidyl ether and an antioxidant.

[0012] In one embodiment of the present invention, the amount of polypropylene glycol diglycidyl ether is 1-3 parts by weight.

[0013] In one embodiment of the present invention, the amount of antioxidant used is 0.3-0.5 parts by weight.

[0014] In one embodiment of the present invention, the antioxidant is one or more of antioxidant 1010, antioxidant 1024 and antioxidant 1035.

[0015] A second aspect of the present invention provides a method for preparing the above-mentioned PPC spinning, comprising the following steps: (1) PPC and maleic anhydride are mixed and end-capped by melt blending extrusion to obtain end-capped PPC; (2) The PPC after end capping is mixed evenly with other raw materials, melt-blended and spun, and wound to obtain nascent fibers; (3) The nascent fibers are subjected to thermal stretching treatment to obtain the final product.

[0016] As one embodiment of the present invention, in step (1), a twin-screw extruder is used for melt blending extrusion, with a heating temperature of 150-190℃, a time of 4-8 min, and a rotation speed of 30-70 r / min; As one embodiment of the present invention, in step (2), a melt spinning machine is used for melt blending spinning. First, the end-capped PPC and other raw materials are heated and melted in the extruder of the melt spinning machine. Then, the metering pump is turned on, and the fibers are extruded from the spinneret of the die head, cooled, and wound on the winding drum to obtain nascent fibers.

[0017] As one embodiment of the present invention, the heating and melting parameters in step (2) are: heating temperature 150-190℃, time 4-8min, screw speed 30-70r / min; the speed of the metering pump is 15-30Hz; the temperature of the die head is 150-190℃, and the extrusion pressure is 4-8MPa; the cooling parameters are: cold air temperature 30-60℃, and wind speed 3-6m / s.

[0018] As one embodiment of the present invention, the temperature of the hot stretching treatment in step (3) is 55-65°C and the stretching ratio is 2-3 times.

[0019] A third aspect of the present invention provides the application of the PPC spinning method described above or the PPC spinning obtained by the above preparation method in the preparation of dyed fabrics.

[0020] The beneficial effects of this invention are: This invention improves the breaking strength, elongation at break, and dyeing properties of PPC spinning by composite spinning of PPC and polylactic acid and the addition of specific auxiliaries. In particular, the combination of maleic anhydride-grafted polyethylene and polyvinyl alcohol significantly enhances the improvement effect.

[0021] Based on the above scheme, the present invention further adds polypropylene glycol diglycidyl ether, which can further improve the mechanical properties and dyeing properties of PPC spinning. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0023] The following information pertains to the sources of some raw materials in the various embodiments: PPC was purchased from Jiangsu Zhongke Jinlong Environmental Protection New Materials Co., Ltd., with a molecular weight of 10,000-50,000. Polylactic acid was purchased from Anhui Fengyuan Biotechnology Co., Ltd., model FY202. Maleic anhydride-grafted polyethylene was purchased from Dongguan Shengli New Materials Co., Ltd., grade SL-12. Polyvinyl alcohol was purchased from Dongguan Baojia Plastics Co., Ltd., grade 27-96. Polypropylene glycol diglycidyl ether was purchased from Jiangsu Renhe Environmental Protection Technology Co., Ltd.

[0024] Example 1 A PPC spinning process, prepared by weight, comprises the following raw materials: 60 parts PPC, 15 parts polylactic acid, 3 parts maleic anhydride-grafted polyethylene, 1 part polyvinyl alcohol, 0.5 parts maleic anhydride, and 0.1 parts benzoyl peroxide.

[0025] The preparation process of PPC spinning is as follows: (1) PPC and maleic anhydride were mixed and melt-blended using a twin-screw extruder. The heating temperature was 150℃, the time was 8min, and the rotation speed was 50r / min to obtain the end-capped PPC. (2) The end-capped PPC is mixed evenly with other raw materials and melt-blended spinning is carried out using a melt spinning machine. First, the end-capped PPC and other raw materials are heated and melted in the extruder of the melt spinning machine at a temperature of 165°C for 8 minutes and a screw speed of 50 r / min. Then, the metering pump is turned on at a speed of 15 Hz and the extrusion is carried out through the spinneret at a temperature of 170°C and a pressure of 6 MPa. The machine is cooled by cold air at a temperature of 30°C and a speed of 6 m / s. The nascent fiber is then wound on the winding drum. (3) The nascent fibers are subjected to thermal stretching treatment at 60°C with a stretching ratio of 2.5 times to obtain PPC spinning.

[0026] Example 2 A PPC spinning process, prepared by weight, comprises the following raw materials: 100 parts PPC, 90 parts polylactic acid, 5 parts maleic anhydride-grafted polyethylene, 3 parts polyvinyl alcohol, 1 part maleic anhydride, and 0.2 parts dicumyl peroxide.

[0027] The preparation process of PPC spinning is as follows: (1) PPC and maleic anhydride were mixed and melt-blended using a twin-screw extruder. The heating temperature was 170℃, the time was 4min, and the rotation speed was 30r / min to obtain the end-capped PPC. (2) The end-capped PPC is mixed evenly with other raw materials and melt-blended spinning is carried out using a melt spinning machine. First, the end-capped PPC and other raw materials are heated and melted in the extruder of the melt spinning machine at a temperature of 175°C for 4 minutes and a screw speed of 30 r / min. Then, the metering pump is turned on at a speed of 30 Hz and the extrusion is carried out through the spinneret at a temperature of 175°C and a pressure of 6 MPa. The machine is cooled by cold air at a temperature of 60°C and a speed of 3 m / s. The nascent fiber is then wound on the winding drum. (3) The nascent fibers are subjected to thermal stretching treatment at 60°C with a stretching ratio of 2.5 times to obtain PPC spinning.

[0028] Example 3 A PPC spinning process, prepared by weight, comprises the following raw materials: 80 parts PPC, 35 parts polylactic acid, 4 parts maleic anhydride-grafted polyethylene, 2 parts polyvinyl alcohol, 1 part maleic anhydride, 0.15 parts benzoyl peroxide, and 0.4 parts antioxidant 1010.

[0029] The preparation process of PPC spinning is as follows: (1) PPC and maleic anhydride were mixed and melt-blended using a twin-screw extruder. The heating temperature was 160℃, the time was 6min, and the rotation speed was 70r / min to obtain the end-capped PPC. (2) The end-capped PPC is mixed evenly with other raw materials and melt-blended spinning is carried out using a melt spinning machine. First, the end-capped PPC and other raw materials are heated and melted in the extruder of the melt spinning machine at a temperature of 170°C for 6 minutes and a screw speed of 70 r / min. Then, the metering pump is turned on at a speed of 30 Hz and the extrusion is carried out through the spinneret at a temperature of 170°C and a pressure of 6 MPa. The machine is cooled with cold air at a temperature of 50°C and a speed of 4 m / s. The nascent fiber is then wound on the winding drum. (3) The nascent fibers are subjected to thermal stretching treatment at 60°C with a stretching ratio of 2.5 times to obtain PPC spinning.

[0030] Example 4 A PPC spinning process, prepared by weight, comprises the following raw materials: 80 parts PPC, 35 parts polylactic acid, 4 parts maleic anhydride-grafted polyethylene, 2 parts polyvinyl alcohol, 1 part maleic anhydride, 0.15 parts benzoyl peroxide, 0.4 parts antioxidant 1010, and 2 parts polypropylene glycol diglycidyl ether.

[0031] The preparation process of PPC spinning is the same as in Example 3.

[0032] Comparative Example 1 Compared with Example 3, the only difference is that maleic anhydride-grafted polyethylene is not added, and the amount of polyvinyl alcohol is adjusted to 6 parts, while all other conditions are the same.

[0033] Comparative Example 2 Compared with Example 3, the only difference is that polyvinyl alcohol is not added, and the amount of maleic anhydride-grafted polyethylene is adjusted to 6 parts, while all other conditions are the same.

[0034] Comparative Example 3 Compared with Example 4, the only difference is that maleic anhydride-grafted polyethylene and polyvinyl alcohol are not added, and the amount of polypropylene glycol diglycidyl ether is adjusted to 8 parts.

[0035] Test Example 1 Mechanical Property Test The mechanical properties of the PPC spun fibers obtained in Examples 1-4 and Comparative Examples 1-3 were tested using an XG-1A fiber tensile strength tester. The tensile speed was 15 mm / min and the clamp distance was 10 mm. Each sample was tested 6 times and the average value was taken. The results are shown in Table 1.

[0036] Table 1. Mechanical property test results

[0037] Test Example 2: Staining Performance Test The color uptake rate was determined according to the national standard GB / T 9337-2009. The method was transmission method. Specifically, disperse red was used for staining at room temperature, and the staining depth was 1 / 1 of the standard staining depth. The color uptake rate was tested, and the results are shown in Table 2.

[0038] Table 2. Coloring Rate Test Results

[0039] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included within the scope of the technical solution of the present invention.

Claims

1. A PPC spinning method, characterized in that, The raw materials for preparation, by weight, include 60-100 parts PPC, 15-90 parts polylactic acid, 3-5 parts maleic anhydride-grafted polyethylene, 1-3 parts polyvinyl alcohol, 0.5-1 parts maleic anhydride, and 0.1-0.2 parts initiator.

2. The PPC spinning according to claim 1, characterized in that, The initiator includes at least one of benzoyl peroxide and dicumyl peroxide.

3. The PPC spinning according to claim 1 or 2, characterized in that, The raw materials for preparing PPC spinning also include at least one of polypropylene glycol diglycidyl ether and an antioxidant.

4. The PPC spinning according to claim 3, characterized in that, The amount of polypropylene glycol diglycidyl ether is 1-3 parts by weight, and the amount of antioxidant is 0.3-0.5 parts.

5. The PPC spinning according to claim 3, characterized in that, The antioxidant is one or more of antioxidant 1010, antioxidant 1024 and antioxidant 1035.

6. A method for preparing PPC spinning according to any one of claims 1-5, characterized in that, Includes the following steps: (1) PPC and maleic anhydride are mixed and end-capped by melt blending extrusion to obtain end-capped PPC; (2) The PPC after end capping is mixed evenly with other raw materials, melt-blended and spun, and wound to obtain nascent fibers; (3) The nascent fibers are subjected to thermal stretching treatment to obtain the final product.

7. The method for preparing PPC spinning according to claim 6, characterized in that, In step (1), a twin-screw extruder is used for melt blending extrusion, with a heating temperature of 150-190℃, a time of 4-8 min, and a rotation speed of 30-70 r / min; And / or the temperature of the thermal stretching treatment in step (3) is 55-65°C and the stretching ratio is 2-3 times.

8. The method for preparing PPC spinning according to claim 6, characterized in that, In step (2), a melt spinning machine is used for melt blending and spinning. First, the end-capped PPC and other raw materials are heated and melted in the extruder of the melt spinning machine. Then, the metering pump is turned on, and the fibers are extruded from the spinneret of the die head, cooled, and wound on the winding drum to obtain nascent fibers.

9. The method for preparing PPC spinning according to claim 8, characterized in that, The parameters for heating and melting in step (2) are: heating temperature 150-190℃, time 4-8min, screw speed 30-70r / min; the speed of the metering pump is 15-30Hz; the temperature of the die head is 150-190℃, and the extrusion pressure is 4-8MPa; the parameters for cooling are: cold air temperature 30-60℃, and wind speed 3-6m / s.

10. The application of PPC spinning as described in any one of claims 1-5 or PPC spinning prepared by any one of claims 6-9 in the preparation of dyed fabrics.

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