Antioxidant composition suitable for polyolefin fiber and application thereof

Abstract

The invention provides an antioxidant composition suitable for polyolefin fibers and application of the antioxidant composition. The antioxidant composition suitable for polyolefin fibers comprises a first component and a second component, the first component is at least one of hindered phenol antioxidants shown in a formula I, the second component is at least one of a polyhydroxy compound and a polymer thereof, and the polyhydroxy compound is a compound containing 2-20 hydroxyl groups; in the formula I, R1 and R2 are respectively and independently selected from C1-C4 alkyl groups, and R3 is C12-C20 straight chain or branched chain alkyl groups. # imgabs0 #

Description

Technical Field

[0001] The invention relates to the field of polymer material additives, and in particular to an antioxidant composition suitable for polyolefin fibers and application thereof. Background Art

[0002] Polyolefin fibers, especially polypropylene fibers, have special properties such as low density, high strength, and good chemical corrosion resistance, and are widely used in building materials, carpets, lawns and other fields.

[0003] Polyolefin fibers are usually prepared by melt spinning. In order to improve the heat aging resistance of the fibers, peroxides and antioxidants are usually added to the spinning masterbatch. The role of peroxides is to improve the fluidity of the spinning melt in order to ensure the melt spinning processing performance. The role of antioxidants is to improve their heat aging resistance. Color index is one of the more important evaluation indicators of polyolefin fibers, and it is often affected by heat aging resistance. Therefore, how to improve the color index of polyolefin fibers on the basis of more appropriate melt fluidity so that it can take into account good melt spinnability, color index and heat aging resistance is a difficulty in the field of polyolefin fiber processing.

[0004] In the prior art, the commonly used polyolefin fiber antioxidants include 1010 / 168 antioxidant composition and 1425 / 168 antioxidant composition. However, the fiber using the 1010 / 168 antioxidant composition still turns yellow significantly, and the color retention ability is insufficient. Although the use of the 1425 / 168 antioxidant composition can inhibit the yellowing of the fiber, it cannot maintain long-term stability, the fiber has insufficient anti-aging property, and the spinning melt is prone to unstable fluidity during the melt spinning process. Summary of the invention

[0005] The main purpose of the present invention is to provide an antioxidant composition suitable for polyolefin fibers and its application, so as to solve the problem that the polyolefin fibers in the prior art cannot have good color index, suitable spinning melt fluidity and good anti-aging property.

[0006] In order to achieve the above object, according to one aspect of the present invention, there is provided an antioxidant composition suitable for polyolefin fibers, comprising a first component and a second component, the first component being at least one of the hindered phenol antioxidants shown in formula I, the second component being at least one of a polyhydroxy compound and a polymer thereof, the polyhydroxy compound being a compound containing 2 to 20 hydroxyl groups;

[0007]

[0008] In Formula I, R 1 and R 2 are independently selected from C1 ~C 4 The alkyl group, R 3 C 12 ~C 20 A straight chain or branched chain alkyl group.

[0009] Furthermore, the first component is a solid hindered phenol antioxidant, R 1 and R 2 are independently selected from methyl or tert-butyl, R 3 C 16 ~C 18 The first component is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl ester; the polyhydroxy compound is erythritol, pentaerythritol, dipentaerythritol, tripentaerythritol, ethylene glycol, butylene glycol, glycerol, trimethylolpropane, triisopropanolamine, panthenol, boric acid, monostearate, (mono) caprylic / capric glyceride, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, tripropylene glycol, trimethylolethane, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, 1,2,6-hexanetriol, monoethanolamine, diethanolamine, triethanolamine, sorbitol, xylitol, sucrose, mannitol, N,N,N',N'-tetrakis(2-hydroxypropyl)-ethylenediamine or one or more thereof.

[0010] Furthermore, the relative molecular mass of the polymer of the polyhydroxy compound is 3000 or less, preferably 2000-3000; preferably, the polyhydroxy polymer is preferably a polymer of pentaerythritol, dipentaerythritol, and tripentaerythritol. Furthermore, the second component is at least one of pentaerythritol, dipentaerythritol, tripentaerythritol, and polypentaerythritol.

[0011] Furthermore, the weight ratio between the first component and the second component is 10:1 to 1:10, preferably 5:1 to 1:5, and more preferably 2:1 to 1:2.

[0012] According to another aspect of the present invention, a polyolefin fiber raw material composition is provided, which comprises polyolefin, peroxide and antioxidant, wherein the antioxidant is the antioxidant composition suitable for polyolefin fiber as described above.

[0013] Furthermore, the content of antioxidant relative to polyolefin is 200-2000ppm, preferably 300-1500ppm, more preferably 500-1000ppm; preferably, the melt index of the raw material composition is 10-60g / 10min, preferably 10-40g / 10min, more preferably 14-25g / 10min.

[0014] Furthermore, the polyolefin is polypropylene or polyethylene.

[0015] Further, the peroxide is one or more of di-tert-butyl peroxide, diisopropylbenzene peroxide, dibenzoyl peroxide, di(4-methylbenzoyl)peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane or 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane, azoisobutylcyanamide and azobisisobutyronitrile.

[0016] Furthermore, the raw material composition exists in the form of a mixture of polyolefin, peroxide and antioxidant; preferably, the peroxide exists in the form of polymer masterbatch.

[0017] The present invention provides an antioxidant composition suitable for polyolefin fibers. The antioxidant composition is applied to polyolefin melt spinning, so that the polyolefin fibers can have good color index, suitable spinning melt fluidity and good anti-aging property. Specifically, the antioxidant composition has good spinnability in the melt spinning process, good anti-aging property of the spinning melt, stable fluidity, and ensures the stability of the spinning process. After application, the polyolefin fiber precursor obtained by melt spinning has good color index, heat aging resistance, and good color stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A comparison chart of the initial 190°C melt index and the initial YI value of each antioxidant composition in the examples and comparative examples is shown in FIG. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] As described in the background technology section, the polyolefin fiber in the prior art cannot take into account the problem of good color index, suitable spinning melt fluidity and good aging resistance. In order to solve this problem, the inventors conducted a lot of research on the types of antioxidants and finally proposed an antioxidant composition suitable for polyolefin fibers.

[0022] In a typical embodiment, the antioxidant composition suitable for polyolefin fibers comprises a first component and a second component, wherein the first component is at least one of the hindered phenol antioxidants shown in formula I, and the second component is at least one of a polyhydroxy compound and a polymer thereof, wherein the polyhydroxy compound is a compound containing 2 to 20 hydroxyl groups;

[0023]

[0024] In Formula I, R 1 and R 2 are independently selected from C 1 ~C 4 The alkyl group, R 3 C 12 ~C 20 A straight chain or branched chain alkyl group.

[0025] The antioxidant composition adopts a compound form of hindered phenol antioxidant shown in formula I and one or more of polyhydroxy compounds and polymers thereof. The inventor unexpectedly found that the use of the antioxidant composition can significantly improve the color and stability of the raw yarn of polyolefin fiber, and still maintain good color indicators after a long period of heat treatment. In addition, due to the particularity of the melt spinning process, the spinning melt needs to be kept at a high temperature for a long time. The use of the antioxidant also effectively overcomes the melt aging problem existing in the application of the 1425 / 168 antioxidant composition, so that the spinning melt can maintain good flow stability for a long time.

[0026] In conclusion, the antioxidant composition is applied to polyolefin melt spinning, so that the polyolefin fiber can have good color index, suitable spinning melt fluidity and good anti-aging property.

[0027] It should be noted that the polyhydroxy compounds and polymers thereof, in addition to being able to exert the above-mentioned beneficial effects when used in combination with the hindered phenol antioxidants shown in Formula I, are also conducive to the good dispersion of the antioxidant composition in the polyolefin melt, and are not easy to precipitate in the fiber, and are conducive to maintaining the stability of the melt fluidity, thereby promoting more stable melt spinning and fiber performance. In addition, the hindered phenol antioxidants shown in Formula I above are not existing known compounds or can be prepared by existing known methods, which will not be repeated here.

[0028] In a preferred embodiment, the first component is a solid hindered phenol antioxidant, R 1 and R 2 are independently selected from methyl or tert-butyl, R 3 C 16 ~C 18 The first component is selected to have a better compounding effect with polyhydroxy compounds and polymers thereof. Most preferably, the first component is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1076).

[0029] In addition to the hindered phenol antioxidant shown in Formula I, the optimization of the types of polyhydroxy compounds and their polymers is also conducive to further improving the compounding effect, and has a better promoting effect on the processing performance, color index and anti-aging performance of polyolefin fibers. In a preferred embodiment, the polyol is one or more of erythritol, pentaerythritol, dipentaerythritol, tripentaerythritol, ethylene glycol, butylene glycol, glycerol, trimethylolpropane, triisopropanolamine, panthenol, boric acid, glyceryl monostearate, (mono) caprylic / capric glyceride, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, tripropylene glycol, trimethylolethane, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, 1,2,6-hexanetriol, monoethanolamine, diethanolamine, triethanolamine, sorbitol, xylitol, sucrose, mannitol, and N,N,N',N'-tetrakis(2-hydroxypropyl)-ethylenediamine. Using the above-mentioned polyol and using it and / or its polymer as the second component has better efficacy.

[0030] The relative molecular mass of the polymer of the above polyhydroxy compound is preferably 3000 or less. By controlling the molecular weight within the above range, the stability during the spinning process is higher, and the antioxidant composition forms a better dispersion in the polyolefin melt, and the long-term anti-aging performance of the fiber after application is better. Specifically, the molecular weight of the polymer of the above polyhydroxy compound can be 100, 200, 300, 400, 500, 600, 700, 800, 1000, 1200, 1500, 1800, 2000, 2200, 2500, 2800, 3000 or an intermediate value between any two. More preferably, the relative molecular mass of the polymer of the above polyhydroxy compound is 2000 to 3000. The polyhydroxy polymer is preferably a polymer of pentaerythritol, dipentaerythritol, and tripentaerythritol.

[0031] More preferably, the second component is at least one of pentaerythritol, dipentaerythritol, tripentaerythritol and polypentaerythritol. Pentaerythritol itself has a low cost, which is also conducive to reducing the production cost of polyolefin fibers. Dipentaerythritol, tripentaerythritol and polypentaerythritol have the advantage of being more colorful.

[0032] In order to further exert the synergistic effect between the above two components, more preferably, the weight ratio between the first component and the second component is 10:1-1:10, for example, it can be 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3:1, 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9 or any intermediate values ​​​​between them, preferably 5:1-1:5, more preferably 2:1-1:2, and most preferably 1:1.

[0033] According to another aspect of the present invention, a polyolefin fiber raw material composition is also provided, which includes polyolefin, peroxide and antioxidant, wherein the antioxidant is the antioxidant composition suitable for polyolefin fiber as described above. The polyolefin fiber raw material composition has suitable melt fluidity and strong anti-aging ability during melt spinning, ensuring good spinning ability in a molten state for a long time. At the same time, the polyolefin fiber formed by melt spinning has good color index and color stability, and the color stability is good after long-term heat treatment. In short, based on the comprehensive performance advantages, the raw material composition is very suitable for polyolefin fiber melt spinning and can be used on a large scale in industrial production.

[0034] In order to further exert the above beneficial effects, in a preferred embodiment, the content of the antioxidant relative to the polyolefin is 200 to 2000ppm, for example: 200ppm, 500ppm, 800ppm, 1000ppm, 1200ppm, 1500ppm, 1800ppm, 2000ppm, etc., preferably 300 to 1500ppm, more preferably 500 to 1000ppm. Controlling the concentration of the antioxidant within the above range is more conducive to comprehensively improving the melt fluidity and color index of the spinning melt. In addition, in order to further ensure the stability during the melt spinning process, preferably, the melt index of the raw material composition is 10 to 60g / 10min, preferably 10 to 40g / 10min, and more preferably 15 to 25g / 10min. In the specific processing process, the addition of peroxide can adjust the range of the above melt index, so the amount of peroxide added can be adjusted according to the melt index required for melting, which will not be repeated here.

[0035] The above-mentioned polyolefin can be a type commonly used in the field of melt spinning, including but not limited to polyolefins such as polypropylene or polyethylene. More preferably, the above-mentioned specificity is polypropylene. The use of the above-mentioned composite antioxidant composition of the present invention has a more obvious effect on improving the performance of the melt-spinning fiber of polypropylene.

[0036] The above-mentioned peroxide can adopt the peroxide commonly used in the art to improve fluidity. Considering the effect of compounding with the above-mentioned antioxidant composition, in a preferred embodiment, the peroxide includes but is not limited to di-tert-butyl peroxide (DTBP), diisopropylbenzene peroxide (DCP), dibenzoyl peroxide, di(4-methylbenzoyl) peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane or 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane, azoisobutylcyanoformamide and azobisisobutyronitrile. One or more.

[0037] In a preferred embodiment, the raw material composition is present in the form of a mixture of polyolefin, peroxide, and antioxidant. The polyolefin, peroxide, and antioxidant are mixed and melted before spinning. Preferably, the peroxide is present in the form of a polymer masterbatch, such as a polypropylene masterbatch of peroxide.

[0038] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0039] The melt index was tested according to ISO 1133 and the YI value was tested according to ASTM E313.

[0040] Main raw materials used in the embodiments of the present invention:

[0041] Antioxidant 1076: β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate

[0042] GMS90: Glyceryl Monostearate

[0043] Antioxidant 1425: Calcium Bis(3,5-di-tert-butyl-4-hydroxybenzylphosphonate)

[0044] Antioxidant 1790: Tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanuric acid

[0045] Antioxidant 1010: Pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, commercially available product

[0046] Antioxidant 3114: 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, commercially available product

[0047] Antioxidant HP136: 3,4-di-tert-butyl-5-(2,4-dimethylphenyl)benzofuran-2(3H)-one

[0048] Antioxidant FS042: Dioctadecylhydroxylamine

[0049] Antioxidant 168: Tris[2,4-di-tert-butylphenyl]phosphite

[0050] Example 1

[0051] Melt spinning grade polypropylene, 0.5% peroxide masterbatch (Dawn cooling masterbatch S-25010, which contains 90% polypropylene and 10% peroxide (CAS: 78-63-7, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane), and 0.1% antioxidant are melt-extruded and granulated at 185° C. to form pellets; the antioxidant is antioxidant 1076 and pentaerythritol, and the weight ratio of the two is 1:1.

[0052] The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0053] Example 2

[0054] The antioxidant composition in Example 1 was replaced with 1076 and glyceryl monostearate (GMS90), with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0055] Example 3

[0056] The antioxidant composition in Example 1 was replaced with 1076 and dipentaerythritol (DPE), with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0057] Example 4

[0058] The antioxidant composition in Example 1 was replaced with 1076 and tripentaerythritol (TPE), with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0059] Comparative Example 1

[0060] The pellets without adding antioxidant in Example 1 were used as a blank comparative example, and the initial 190° C. melt index was tested. The initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0061] Comparative Example 2

[0062] The antioxidant in Example 1 was replaced with antioxidant 1425 and antioxidant 168, with a weight ratio of 1:1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0063] Comparative Example 3

[0064] The antioxidant in Example 1 was replaced with antioxidant 1076 and antioxidant 168, with a weight ratio of 1:1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0065] Comparative Example 4

[0066] The antioxidant in Example 1 was replaced with antioxidant 3114 and antioxidant 168, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0067] Comparative Example 5

[0068] The antioxidant composition in Example 1 was replaced with antioxidant 1010 and antioxidant 168, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0069] Comparative Example 6

[0070] The antioxidant composition in Example 1 was replaced with antioxidant 1790 and antioxidant 168, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0071] Comparative Example 7

[0072] The antioxidant composition in Example 1 was replaced with antioxidant 1010 and antioxidant 626, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0073] Comparative Example 8

[0074] The antioxidant in Example 1 was replaced by antioxidant HP136 and antioxidant 168, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0075] Comparative Example 9

[0076] The antioxidant composition in Example 1 was replaced with antioxidant FS042 and antioxidant 168, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0077] Comparative Example 10

[0078] The antioxidant composition in Example 1 was replaced with antioxidant 3114 and pentaerythritol, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0079] Comparative Example 11

[0080] The antioxidant composition in Example 1 was replaced with antioxidant 1076 and lubricant PPA, with a weight ratio of 1: 1. The initial 190°C melt index of the above melt spinning raw material composition was tested, and its initial YI value was measured using a spectrophotometer. The results are shown in Table 1.

[0081] (1) The initial 190°C melt index and initial YI value results in the above examples and comparative examples are as follows:

[0082] Table 1

[0083] Antioxidant composition Initial 190℃ Melt Index Initial YI Example 1 1076+Pentaerythritol (PER) 14.4912 0.77 Example 2 1076+GMS90 20.67 -1.05 Example 3 1076+Dipentaerythritol (DPE) 14.75 -0.90 Example 4 1076+Tripentaerythritol (TPE) 15.21 -1.19 Comparative Example 1 blank 22.944 -0.86 Comparative Example 2 1425+168 21.78 -1.21 Comparative Example 3 1076+168 17.94 2.68 Comparative Example 4 3114+168 17.04 -0.63 Comparative Example 5 1010+168 15.612 1.56 Comparative Example 6 1790+168 13.872 3.87 Comparative Example 7 1010+626 11.922 1 Comparative Example 8 HP136+168 10.452 -0.61 Comparative Example 9 FS042+168 12.1488 -1.2 Comparative Example 10 3114+Pentaerythritol (PER) 19.97 -0.17 Comparative Example 11 1076+PPA 15.74 0.3

[0084] Figure 1 A comparison chart of the initial 190°C melt index and initial YI value of each antioxidant composition in the embodiment and the comparative example is shown in the figure. In the above figure, the horizontal axis is the melt index MFI value, and the vertical axis is the yellow value YI value. The higher the vertical axis, the smaller the YI value, that is, the better the color. As can be seen from the figure, the effect of 1076+pentaerythritol / 3114+pentaerythritol on the melt index is similar to that of traditional hindered phenol antioxidants + auxiliary antioxidants, but its color is better than 1010+168, 1076+168, 1790+168. The closer the horizontal axis is to the blank group, the smaller the effect on the melt index. In comparison, free radical scavenger + auxiliary antioxidant, 1010+626, HP136+168, FS042+168 have too much effect on the melt index and are not considered as the optimal object. The melt index is between 14 and 25, and usually has good spinning performance.

[0085] (2) Based on the above examples and comparative examples, only the amount of peroxide added was adjusted to adjust the melt index to a similar level (about 17), and then aged in an oven at 120°C for 48h, 120h and 144h, and the changes in YI value and melt index were compared. The results of the change in YI value are shown in Table 2, and the results of the change in melt index are shown in Table 3.

[0086] Table 2

[0087]

[0088] From the above data, it can be seen that after 120 hours, the samples of the blank group and the 1425+168 group became waxy. In addition, the antioxidant compositions of 1076+pentaerythritol, 1076+GMS90, 1076+DPE, and 1076+TPE corresponding to Examples 1 to 4 have the best color protection for polypropylene, and the YI value is the lowest after 120 hours.

[0089] Table 3

[0090]

[0091]

[0092] As a judgment index of melt stability, the change of melt index after 48 hours is mainly observed (the melt index will normally decrease in the first 48 hours because peroxide will cause partial crosslinking of macromolecules). The experimental results show that in Comparative Examples 2, 4, 5, 9 and 11, especially in Comparative Example 2, when 1425+168 is used as an antioxidant, the polypropylene melt becomes waxy after 120 hours, and the antioxidant capacity is insufficient. The melt index of the remaining experimental groups can maintain a relatively stable state in 48 hours. The antioxidant composition of the embodiment of the present invention is applied to the polypropylene melt, and the melt index changes little after 48 hours.

[0093] The above data show that after the antioxidant composition in Examples 1 to 4 is applied to the polypropylene resin, it has the best comprehensive performance in terms of initial color, initial melt index, color protection and melt index stability.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An antioxidant composition suitable for polyolefin fibers, characterized in that: It comprises a first component and a second component, wherein the first component is at least one of the hindered phenol antioxidants shown in formula I, and the second component is at least one of a polyhydroxy compound and a polymer thereof, wherein the polyhydroxy compound is a compound containing 2 to 20 hydroxyl groups; In Formula I, R1 and R2 are independently selected from C1 to C4 alkyl groups, and R3 is C 12 ~C 20 A straight chain or branched chain alkyl group.

2. The antioxidant composition suitable for polyolefin fibers according to claim 1, characterized in that: The first component is a solid hindered phenol antioxidant, R1 and R2 are independently selected from methyl or tert-butyl, R3 is C 16 ~C 18 A straight chain or branched alkyl group; preferably, the first component is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; The polyhydroxy compound is one or more of erythritol, pentaerythritol, dipentaerythritol, tripentaerythritol, ethylene glycol, butylene glycol, glycerol, trimethylolpropane, triisopropanolamine, panthenol, boric acid, glyceryl monostearate, (mono) caprylic / capric glyceride, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, tripropylene glycol, trimethylolethane, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, 1,2,6-hexanetriol, monoethanolamine, diethanolamine, triethanolamine, sorbitol, xylitol, sucrose, mannitol, and N,N,N',N'-tetrakis(2-hydroxypropyl)-ethylenediamine.

3. The antioxidant composition suitable for polyolefin fibers according to claim 2, characterized in that: The relative molecular mass of the polymer of the polyhydroxy compound is 3000 or less, preferably 2000 to 3000; Preferably, the polyhydroxy polymer is a polymer of pentaerythritol, dipentaerythritol or tripentaerythritol.

4. The antioxidant composition suitable for polyolefin fibers according to any one of claims 1 to 3, characterized in that: The second component is at least one of pentaerythritol, dipentaerythritol, tripentaerythritol and polypentaerythritol.

5. The antioxidant composition suitable for polyolefin fibers according to any one of claims 1 to 4, characterized in that: The weight ratio between the first component and the second component is 10:1 to 1:10, preferably 5:1 to 1:5, and more preferably 2:1 to 1:

2.

6. A polyolefin fiber raw material composition, characterized in that: The raw material composition comprises polyolefin, peroxide and antioxidant, and the antioxidant is the antioxidant composition suitable for polyolefin fiber according to any one of claims 1 to 5.

7. The polyolefin fiber raw material composition according to claim 6, characterized in that: The content of the antioxidant relative to the polyolefin is 200-2000 ppm, preferably 300-1500 ppm, more preferably 500-1000 ppm; preferably, the melt index of the raw material composition is 10-60 g / 10min, preferably 10-40 g / 10min, more preferably 14-25 g / 10min.

8. The polyolefin fiber raw material composition according to claim 6 or 7, characterized in that: The polyolefin is polypropylene or polyethylene.

9. The polyolefin fiber raw material composition according to any one of claims 6 to 8, characterized in that: The peroxide is one or more of di-tert-butyl peroxide, diisopropylbenzene peroxide, dibenzoyl peroxide, di(4-methylbenzoyl)peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane or 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane, azoisobutylcyanamide and azobisisobutyronitrile.

10. The polyolefin fiber raw material composition according to any one of claims 6 to 9, characterized in that: The raw material composition exists in the form of a mixture of the polyolefin, the peroxide, and the antioxidant; preferably, the peroxide exists in the form of a polymer masterbatch.

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