High-coloring-adaptability environment-friendly degradable polypropylene fiber and preparation method thereof

Abstract

The invention relates to the field of environment-friendly fibers, in particular to environment-friendly degradable polypropylene fiber with high coloring adaptability as well as a preparation method and application of the environment-friendly degradable polypropylene fiber. The recycled PP / degradable polyester composite material is prepared from the following raw materials in parts by weight: 40-70% of recycled PP, 15-50% of degradable polyester, 1-10% of a modifier, 0.1-3% of a pigment and the balance of a processing aid, the degradable polyester is composed of one or more of polylactic acid, polyhydroxyalkanoate and polymethyl ethylene carbonate; the modifier is composed of a carboxyl-terminated polymer, microcrystalline cellulose, a maleic anhydride graft and modified rosin resin in a weight ratio of 1: (3-5): (1-3): (1-1.8); the carboxyl-terminated polymer is polylactic acid-glycolic acid copolymer-carboxylic acid and / or carboxyl-terminated polycaprolactone; the environment-friendly degradable polypropylene fiber with high coloring adaptability not only has a good environment-friendly characteristic, but also has an excellent coloring effect and physical properties.

Description

Technical Field

[0001] The present application relates to the field of environmentally friendly fibers, and more specifically, to an environmentally friendly biodegradable polypropylene fiber with high coloring adaptability and a preparation method and application thereof. Background Art

[0002] Polypropylene, as a key synthetic fiber, is mainly made of petroleum-based material PP and is widely used in many industries such as textiles, packaging, and decoration. However, the non-degradability and environmental pollution of PP are becoming increasingly prominent. With the increasing awareness of environmental protection, recycling and reusing PP to produce polypropylene has become a trend. Despite this, some polypropylene still faces the challenges of difficult recycling and easy stacking to cause environmental pollution. Therefore, the development of environmentally friendly and degradable polypropylene has become a top priority for the industry.

[0003] To meet this demand, the current industry has introduced biodegradable agents, adopted biodegradable materials and other strategies to compound with PP to produce polypropylene, aiming to make polypropylene degrade rapidly in the natural environment, thereby reducing environmental pollution. These efforts have alleviated the environmental protection and biodegradability issues of polypropylene to a certain extent, but there are still obvious shortcomings in practical applications.

[0004] Especially in the fields of Christmas tree decorations, doll wigs, and human wigs, the instability of the nature of the recycled PP material itself leads to uneven color distribution of the final product, poor coloring effect, and poor adaptability to various colors. This problem not only affects the aesthetics of the product, but also limits the wide application of polypropylene in these fields.

[0005] Therefore, how to ensure that polypropylene has environmental protection and biodegradable characteristics while further improving its coloring adaptability and overall performance has become a technical problem that needs to be overcome urgently. Future research and development should focus on optimizing compounding processes, screening higher-quality biodegradable materials, and improving coloring technology, so as to achieve a perfect combination of environmental protection, biodegradability, and color adaptability while maintaining the original physical properties of polypropylene. Summary of the invention

[0006] In order to improve the degradation efficiency of polypropylene fiber and obtain higher coloring adaptability and physical properties, the present application provides an environmentally friendly biodegradable polypropylene fiber with high coloring adaptability and a preparation method.

[0007] In the first aspect, a highly colorable and environmentally friendly biodegradable polypropylene fiber is composed of the following raw materials in parts by weight: Recycled PP: 40-70% Degradable polyester 15-50% Modifier 1-10% Pigment 0.1-3% The balance is processing aids; The degradable polyester is composed of one or more of polylactic acid, polyhydroxyalkanoate, and polymethylethylene carbonate; The modifier is composed of carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product, and modified rosin resin in a weight ratio of 1:(3-5):(1-3):(1-1.8); The carboxyl-terminated polymer is poly(lactic acid-co-glycolic acid)-carboxylic acid and / or carboxyl-terminated polycaprolactone.

[0008] By adopting the above technical solution, the present invention provides an environmentally friendly biodegradable polypropylene fiber with high color adaptability. The fiber adopts a composite material of recycled PP and biodegradable polyester, and adds a specific proportion of modifiers and colorants, which significantly improves the degradation performance, coloring effect and physical properties of the fiber. Specifically: the degradation performance, the addition of biodegradable polyester (polylactic acid, polyhydroxyalkanoate, polymethyl ethylene carbonate) allows the fiber to be more easily decomposed by the natural environment after use, reducing the risk of environmental pollution.

[0009] Coloring effect: The carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product and modified rosin resin in the modifier work together to enhance the dispersion uniformity and stability of the colorant in the fiber, avoiding the common color unevenness and fading problems of traditional recycled PP fibers.

[0010] Physical properties: Microcrystalline cellulose, as a reinforcing material, improves the mechanical properties of the fiber, making it more resistant to breakage; maleic anhydride grafts improve the compatibility between different polymers, further enhancing the overall performance of the fiber.

[0011] In summary, the highly coloring adaptable, environmentally friendly and degradable polypropylene fiber provided by the present invention not only has good environmental characteristics, but also has excellent coloring effects and physical properties, and is suitable for various application scenarios requiring high-performance polypropylene.

[0012] Preferably, the degradable polyester is composed of polylactic acid, polyhydroxyalkanoate and polymethylethylene carbonate in a weight ratio of 1:(1-3):(1-2).

[0013] By adopting the above technical solution, specifically, the combination of polylactic acid, polyhydroxyalkanoate, and polymethylethylene carbonate in a weight ratio of 1: (1-3): (1-2), the distribution of degradable polyester in polypropylene fiber is made more uniform. The above compounding method not only improves the overall degradation rate of polypropylene fiber, but also enhances its physical properties, especially the coloring adaptability and color stability during the dyeing process.

[0014] When the biodegradable materials are compounded, the recycled PP is more easily decomposed by microorganisms, reducing environmental pollution. Enhanced physical properties: The uniform distribution of the composite material improves the strength and toughness of the polypropylene fiber, making it more suitable for artificial products such as Christmas tree decorations, toys and wigs. Improved coloring effect: The compounded biodegradable polyester has a better affinity with the colorant, making the color more uniform during the dyeing process and less likely to fade.

[0015] Preferably, the carboxyl-terminated polymer is composed of poly(lactic acid-co-glycolic acid)-carboxylic acid and carboxyl-terminated poly(caprolactone) in a weight ratio of 1:(2-5).

[0016] By adopting the above technical solution, the carboxyl-terminated polymer is composed of polylactic acid-co-glycolic acid-carboxylic acid and carboxyl-terminated polycaprolactone in a weight ratio of 1: (2-5). This combination can further improve the dispersion uniformity and stability of the modifier, thereby enhancing the binding of the colorant to the raw material system and avoiding fading and other phenomena. Specifically, polylactic acid-co-glycolic acid-carboxylic acid and carboxyl-terminated polycaprolactone both contain carboxyl functional groups, which can promote the interaction between the colorant, PLA and PP, thereby improving the compatibility between the two, so that the final polypropylene fiber has better coloring adaptability and physical properties.

[0017] Preferably, the maleic anhydride grafted product is a polymer of maleic anhydride and 1-octadecene.

[0018] By adopting the above technical solution, the polymer of maleic anhydride and 1-octadecene as a maleic anhydride graft can further promote the uniformity of dispersion of the colorant and the raw material system, forming a more stable polypropylene fiber structure. The polymer contains a strong polar reactive group (such as maleic anhydride), which can significantly improve the compatibility between different polymers, thereby increasing the binding force between the colorant and PLA and PP, and preventing the occurrence of fading. At the same time, this improvement also enhances the physical properties of polypropylene fiber, making it more durable during use and reducing the generation of waste caused by problems such as breakage. In addition, the polymer of maleic anhydride and 1-octadecene itself has good degradable properties, which helps to reduce the risk of environmental pollution.

[0019] Preferably, the modified rosin resin is hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester.

[0020] By adopting the above technical solution, the modified rosin resin uses hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester, which have the advantage of being degradable and help improve the environmental performance of polypropylene fiber. In particular, rosin modified pentaerythritol ester contains a variety of functional groups and segments, which may be compatible with both PP and PLA, thereby further improving the mechanical properties of polypropylene fiber and the uniformity of colorant dispersion, and avoiding fading and other phenomena.

[0021] Preferably, the modified rosin resin is composed of hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester in a weight percentage of 1: (0.1-0.5).

[0022] By adopting the above technical solution, hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester are used as components of modified rosin resin in a weight percentage ratio of 1: (0.1-0.5), which can further improve the dispersion uniformity of the colorant and the raw material system. Specifically, both modified rosin resins have the advantage of being degradable, and because they contain a variety of functional groups and segments, they can significantly improve the compatibility between the components in polypropylene fiber, especially the adhesion and compatibility between PP and PLA. This not only helps to improve the physical properties of polypropylene fiber, such as mechanical strength and toughness, but also effectively prevents the aggregation and separation of colorants during processing, thereby ensuring that the coloring effect of the final product is more uniform and lasting.

[0023] Preferably, the processing aid is one or more of a plasticizer, a lubricant, a stabilizer, and a filler.

[0024] By adopting the above technical solution, the processing aid is selected from one or more of plasticizers, lubricants, stabilizers, and fillers, which can significantly improve the processing performance of polypropylene fibers and the quality of the final product. Specifically: Plasticizer: It can lower the glass transition temperature of the material, increase the flexibility and ductility of the material, make the polypropylene fiber less likely to break during processing, and improve the yield rate.

[0025] Lubricant: helps reduce friction between materials, making the extrusion process smoother, preventing equipment wear and extending equipment life.

[0026] Stabilizer: It can protect the material from oxidative decomposition at high temperatures, maintain the chemical stability of the material, and ensure that the performance of the product remains unchanged after long-term use.

[0027] Fillers: can reduce costs, while enhancing the mechanical strength and dimensional stability of materials and improving the overall performance of products.

[0028] The rational selection and combination of these processing aids not only improves the processability of polypropylene fiber, but also enhances its physical and chemical properties, making it more suitable for various application scenarios.

[0029] Preferably, the plasticizer is an environmentally friendly plasticizer.

[0030] By adopting the above technical solution, the use of environmentally friendly plasticizers not only improves the flexibility and processing performance of polypropylene fibers, but also reduces the harm of traditional plasticizers to the environment. Specifically, environmentally friendly plasticizers can reduce potential risks to humans and ecosystems while maintaining good plasticizing effects, thereby ensuring the safety of polypropylene fibers during production and application. In addition, the good compatibility of environmentally friendly plasticizers with recycled PP, degradable polyester and other additives further improves the overall performance of the fiber, making it more suitable for various application scenarios, especially in products that require high coloring adaptability and environmental protection characteristics.

[0031] Preferably, the lubricant is PE wax.

[0032] By adopting the above technical solution, the highly colorable and environmentally friendly biodegradable polypropylene fiber not only has good coloring performance and high degradation rate, but also has excellent physical properties. Specifically: the compounding of recycled PP and biodegradable polyester (polylactic acid, polyhydroxyalkanoate, polymethyl ethylene carbonate) improves the degradation efficiency of recycled PP, making it easier to decompose after being discarded, reducing environmental pollution.

[0033] The modifier composed of carboxyl-terminated polymer (polylactic acid-glycolic acid copolymer-carboxylic acid and / or carboxyl-terminated polycaprolactone), microcrystalline cellulose, maleic anhydride graft (polymer of maleic anhydride and 1-octadecene) and modified rosin resin (hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester) significantly improves the dispersion uniformity of degradable polyester, colorant and PP, enhances the binding property of colorant and raw material system, and avoids the occurrence of fading.

[0034] Maleic anhydride grafted products introduce strong polar reactive groups to improve the compatibility between different polymers; modified rosin resin, as a natural renewable resource, has excellent adhesion and compatibility, which further promotes the dispersion uniformity of colorants and raw material systems.

[0035] Microcrystalline cellulose, as a reinforcing material, improves the mechanical properties of the blend and makes the polypropylene fiber more durable.

[0036] Using PE as a lubricant further optimizes the processing performance of polypropylene fiber, ensures the smooth extrusion and drawing process, and improves production efficiency and product quality.

[0037] In summary, by adopting the above technical scheme, the highly coloring adaptable, environmentally friendly and degradable polypropylene fiber not only achieves the environmental protection goal, but also has excellent coloring effect and mechanical properties.

[0038] In a first aspect, a method for preparing an environmentally friendly and degradable polypropylene fiber with high coloring adaptability comprises the following steps: Recycled PP, biodegradable polyester, modifier and processing aid are weighed and mixed evenly according to weight, and then extruded and spun to obtain polypropylene fiber.

[0039] By adopting the above technical solution, the preparation method can effectively improve the coloring adaptability and environmental protection performance of polypropylene fiber. Specifically: The composite use of recycled PP and degradable polyester improves the degradation efficiency and environmental friendliness of the fiber and reduces the pollution of waste polypropylene to the environment.

[0040] The addition of modifiers, especially the compounding of carboxyl-terminated polymers, microcrystalline cellulose, maleic anhydride grafts and modified rosin resins, significantly enhances the dispersion uniformity and binding properties of the colorant in the raw material system, avoids fading, and improves the overall color stability of the fiber.

[0041] Maleic anhydride grafts, as strong polar reactive groups, improve the compatibility between different polymers and further optimize the physical properties of the fiber.

[0042] The use of modified rosin resin not only improves the adhesion and compatibility of the fiber, but also enhances its mechanical properties, making the fiber more durable. The application of environmentally friendly plasticizers and PE lubricants ensures the smooth progress of the fiber preparation process and the environmental protection characteristics of the final product.

[0043] In summary, this preparation method enables the obtained polypropylene fiber to have excellent coloring adaptability, environmental protection characteristics and mechanical properties, and is suitable for various application scenarios that require high coloring adaptability, such as Christmas tree decorations, toy wigs and other artificial products.

[0044] In summary, the present application includes at least one of the following beneficial technical effects: 1. By adding degradable polyesters (such as polylactic acid, polyhydroxyalkanoates, and polymethyl ethylene carbonate) to the recycled PP, the degradation efficiency of polypropylene fiber is significantly improved, and the pollution of waste polypropylene to the environment is reduced.

[0045] 2. The carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride graft and modified rosin resin in the modifier work together to enhance the binding property of the colorant and the raw material system, and improve the color uniformity and coloring effect of the polypropylene fiber.

[0046] 3. Microcrystalline cellulose is used as a reinforcing material to improve the mechanical properties of polypropylene fiber, making it less likely to break during use and extending the service life of the product. DETAILED DESCRIPTION

[0047] The present application is further described in detail below in conjunction with embodiments.

[0048] Introduction of some raw materials: The breaking strength of recycled PP is 2.8N / tex, the breaking elongation is 7.8%, the light transmittance is 83-85%, and the melting point is 168℃; The number average molecular weight of polylactic acid is 50,000-100,000; The number average molecular weight of polyhydroxyalkanoate is 50,000-80,000; Polymethylethylene carbonate number average molecular weight 50,000-100,000; Poly(lactic acid-co-glycolic acid)-carboxylic acid number average molecular weight 10,000-30,000; The number average molecular weight of carboxyl-terminated polycaprolactone is 10,000-30,000; Hydrogenated rosin glycerol ester CAS No. 65997-13-9; Rosin modified pentaerythritol ester manufacturer Jining Fangyu Chemical Co., Ltd. Model 424#, acid value 30mgkoH / g; Maleic anhydride polymer with 1-octadecene CAS No. 25266-02-8; The number average molecular weight of PE wax is 5000-10000. Example

[0049] Example 1 A highly colorable and environmentally friendly biodegradable polypropylene fiber is prepared by the following method: According to the weight of polypropylene, 40% recycled PP, 50% biodegradable polyester, 1% modifier, 1% colorant and 8% processing aid were weighed and put into a stirring device for uniform mixing, and then put into an extruder for melt blending with a melting temperature of 180°C. After extrusion, wire drawing was carried out and then cooled to 30°C by a cooling device to obtain polypropylene with a wire diameter of 0.1 mm.

[0050] The degradable polyester is polylactic acid; the modifier is composed of carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product and modified rosin resin in a weight ratio of 1:3:3:1.

[0051] The carboxyl-terminated polymer is carboxyl-terminated polycaprolactone; the maleic anhydride graft is a polymer of maleic anhydride and 1-octadecene; and the modified rosin resin is hydrogenated rosin glycerol ester.

[0052] The processing aids are plasticizer, lubricant, stabilizer and filler in a weight ratio of 2:1:1:2. The plasticizer is epoxidized soybean oil, the lubricant is PE wax, and the filler is light calcium carbonate. The colorant is lemon chrome yellow; the hiding power is 98-100g / m 2 .

[0053] Example 2 The difference between Example 2 and Example 1 is that the amounts of raw materials are different, as follows: Calculated by weight of polypropylene, it includes 55% recycled PP, 30% biodegradable polyester, 8% modifier, 1% colorant and 6% processing aid.

[0054] The modifier consists of carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product and modified rosin resin in a weight ratio of 1:3:3:1.

[0055] Example 3 The difference between Example 3 and Example 1 is that the amounts of raw materials are different, as follows: Calculated by weight of polypropylene, it includes 70% recycled PP, 15% biodegradable polyester, 10% modifier, 1% colorant and 4% processing aid.

[0056] The modifier consists of carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product and modified rosin resin in a weight ratio of 1:5:1:1.

[0057] Example 4 The difference between Example 4 and Example 2 is that the degradable polyester is polyhydroxyalkanoate.

[0058] Example 5 The difference between Example 5 and Example 2 is that the degradable polyester is polymethyl ethylene carbonate.

[0059] Example 6 The difference between Example 6 and Example 2 is that the degradable polyester is composed of polylactic acid, polyhydroxyalkanoate, and polymethylethylene carbonate in a weight ratio of 1:1:2.

[0060] Example 7 The difference between Example 7 and Example 2 is that the carboxyl-terminated polymer is carboxyl-terminated polycaprolactone.

[0061] Example 8 The difference between Example 8 and Example 2 is that the carboxyl-terminated polymer is composed of poly(lactic acid-co-glycolic acid)-carboxylic acid and carboxyl-terminated polycaprolactone in a weight ratio of 1:2.

[0062] Example 9 The difference between Example 9 and Example 6 is that the carboxyl-terminated polymer is composed of polylactic acid-co-glycolic acid-carboxylic acid and carboxyl-terminated polycaprolactone in a weight ratio of 1:2. Example 10 The difference between Example 10 and Example 6 is that the carboxyl-terminated polymer is composed of poly(lactic acid-co-glycolic acid)-carboxylic acid and carboxyl-terminated polycaprolactone in a weight ratio of 1:5.

[0063] Embodiment 11 The difference between Example 11 and Example 2 is that the rosin resin is rosin-modified pentaerythritol ester.

[0064] Example 12 The difference between Example 12 and Example 2 is that the modified rosin resin is composed of hydrogenated rosin glycerol ester and rosin modified pentaerythritol ester in a weight percentage of 1:0.1.

[0065] Embodiment 13 The difference between Example 13 and Example 6 is that the modified rosin resin is composed of hydrogenated rosin glycerol ester and rosin modified pentaerythritol ester in a weight percentage of 1:0.1.

[0066] Embodiment 14 The difference between Example 14 and Example 10 is that the modified rosin resin is composed of hydrogenated rosin glycerol ester and rosin modified pentaerythritol ester in a weight percentage of 1:0.1.

[0067] Embodiment 15 The difference between Example 15 and Example 10 is that the modified rosin resin is composed of hydrogenated rosin glycerol ester and rosin modified pentaerythritol ester in a weight percentage of 1:0.5.

[0068] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the carboxyl-terminated polymer is replaced by an equal amount of modified rosin resin.

[0069] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the maleic anhydride grafted material is replaced by modified rosin resin in equal amount.

[0070] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that an equal amount of microcrystalline cellulose is replaced by modified rosin resin.

[0071] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modified rosin resin is replaced by maleic anhydride grafted product in equal amount.

[0072] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modifier is a maleic anhydride graft.

[0073] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that the modifier is replaced by degradable polyester in equal amount.

[0074] Performance testing Detection method / test method Test 1: Refer to Shanghai Xinxian XQ-2 fiber strength and elongation tester for testing, sample 5D, clamping distance is 20mm, tensile speed is 20mm / min, pre-tension is 0.5cN / tex.

[0075] Test 2: 1. The polypropylene obtained in Example 1-15 and Comparative Example 1-5 was cut into a length of 20 mm, and both ends were glued together with glue. The total number of fiber filaments was 50, the wire diameter was 5D, and the spread width was 5 mm, to obtain test sample 1.

[0076] 2. The colorants in Examples 1-15 and Comparative Examples 1-5 were replaced with zirconium iron red (hiding power 98-100 g / m 2 ), polypropylene fibers were obtained respectively, and then sheared and bonded by method (1) to obtain test sample 2.

[0077] The Starwo DW-823 desktop spectrophotometer was used to test the test samples 1-2 and compare them with the corresponding samples. The samples were proofing color plates, and the illumination sources were pulsed xenon lamps and LEDs; the wavelength was 500nm, the repeatability of the spectrophotometric transmittance was within 0.05%; the chromaticity value was within 0.015; and the color difference value ΔE was obtained. When ΔE≤0.5, it was recorded as the first level; 0.5<ΔE≤1, it was recorded as the second level; 0.1.1<ΔE≤1.5, it was recorded as the third level; 1.6<ΔE≤2.0, it was recorded as the fourth level; ΔE>2.0, it was recorded as the fifth level; the larger the color difference level, the greater the color difference.

[0078] Test 3: Degradation Rate With reference to the experimental standards of the national standard GB / T 20197-2006, the polypropylene obtained in Examples 1-16 and Comparative Examples 1-5 was buried in the soil for 150 days, and the degradability was tested. The degradability in this application means that after 180 days of burial, the degradation efficiency is more than 75%.

[0079] The above experimental data are shown in Table 1. Table 1 Experimental data of Examples 1-15 and Comparative Examples 1-5 Combining Example 1 and Comparative Examples 1-5 and Table 1, it can be seen that the elongation at break, breaking strength, and degradation efficiency of Comparative Examples 1-5 are lower than those of Example 1, indicating that the present application scheme obtains better physical properties and degradation efficiency, and the color difference grades of Tests (1)-(2) of Comparative Examples 1-5 are all greater than those of Example 1, and the color difference grades are different for different colorants, indicating that the coloring adaptability to different colorants is poor. It is further explained that the present application uses a carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product, and modified rosin resin as a modifier to further improve the comprehensive performance of polypropylene.

[0080] By comparing Examples 2, 6, 8, and 12, it can be seen that the elongation at break, the breaking strength, and the degradation efficiency of Examples 6, 8, and 12 are higher than those of Example 2, and the color difference grades are all lower than the color difference grades of Example 2, indicating that the present application adopts a compound of polylactic acid-glycolic acid copolymer-carboxylic acid and carboxyl-terminated polycaprolactone, a compound of hydrogenated rosin glycerol ester and rosin-modified pentaerythritol ester, and a compound of polylactic acid, polyhydroxyalkanoate, and polymethyl ethylene carbonate to play a synergistic role, thereby further improving the comprehensive performance of the polypropylene fiber.

[0081] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A highly colorable and environmentally friendly biodegradable polypropylene fiber, characterized in that: It is composed of the following raw materials in parts by weight: Recycled PP: 40-70% Degradable polyester 15-50% Modifier 1-10% Pigment 0.1-3% The balance is processing aids; The degradable polyester is composed of one or more of polylactic acid, polyhydroxyalkanoate, and polymethylethylene carbonate; The modifier is composed of carboxyl-terminated polymer, microcrystalline cellulose, maleic anhydride grafted product, and modified rosin resin in a weight ratio of 1: (3-5): (1-3): (1-1.8); The carboxyl-terminated polymer is poly(lactic acid-co-glycolic acid)-carboxylic acid and / or carboxyl-terminated polycaprolactone.

2. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 1, characterized in that: The degradable polyester is composed of polylactic acid, polyhydroxyalkanoate and polymethylethylene carbonate in a weight ratio of 1:(1-3):(1-2).

3. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 1, characterized in that: The carboxyl-terminated polymer is composed of polylactic acid-co-glycolic acid-carboxylic acid and carboxyl-terminated polycaprolactone in a weight ratio of 1:(2-5).

4. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 1, characterized in that: The maleic anhydride grafted product is a polymer of maleic anhydride and 1-octadecene.

5. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 1, characterized in that: The modified rosin resin is hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester.

6. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 5, characterized in that: The modified rosin resin is composed of hydrogenated rosin glycerol ester and / or rosin modified pentaerythritol ester in a weight percentage of 1: (0.1-0.5).

7. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 1, characterized in that: The processing aid is one or more of a plasticizer, a lubricant, a stabilizer and a filler.

8. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 7, characterized in that: The plasticizer is an environmentally friendly plasticizer.

9. The highly colorable and environmentally friendly biodegradable polypropylene fiber according to claim 7, characterized in that: The lubricant is PE wax.

10. A method for preparing the highly colorable and environmentally friendly biodegradable polypropylene fiber according to any one of claims 1 to 9, characterized in that: The following steps are involved: Recycled PP, biodegradable polyester, modifier and processing aid are weighed and mixed evenly according to weight, and then extruded and spun to obtain polypropylene.

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