High-melt-strength regenerated polyester fiber fine-denier yarn and production process thereof

Abstract

The invention provides a high-melt-strength regenerated polyester fiber fine-denier filament and a production process thereof, and relates to the technical field of fiber production. The high-melt-strength regenerated polyester fiber fine-denier yarn is prepared from the following raw material components in parts by weight: 100 parts of regenerated polyester and 0.5 to 5 parts of POSS (Polyhedral Oligomeric Silsesquioxane) modified polyurethane, the POSS modified polyurethane is obtained by reacting polyester polyol with a polyisocyanate compound and then reacting with monoamino POSS. Preferably, the degree of functionality of one of the polyester polyol and the polyisocyanate compound is gt; 2. The high-melt-strength regenerated polyester fiber fine-denier filament has the characteristics of high melt strength, high tensile strength and the like, and the spinning stability and the production efficiency can be obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber production, and relates to a high-melt strength regenerated polyester fine-denier fiber and a production process thereof. Background Art

[0002] Recycled polyester, mainly recycled PET, has been widely used in the fields of footwear, packaging materials, etc. Compared with virgin polyester, the melt viscosity of recycled polyester in the molten state is higher, and a relatively higher melt spinning temperature is required. For example, the melt spinning temperature of virgin polyester is generally 250-270°C, and the melt spinning temperature of recycled polyester generally requires 280-290°C. However, recycled polyester is also prone to broken wires when melt-spinning at this melting temperature. One of the reasons is that the melt strength of recycled polyester is not high enough compared to virgin polyester. In the prior art, in order to improve the melt strength of polyester, a chain extender is generally added. The chain extender reacts in situ with the end groups of the polyester molecular chain in the molten state to expand the molecular weight of the polyester and improve the melt strength, but it also increases the melt viscosity.

[0003] Therefore, for recycled polyester, it is an urgent problem to improve its melt strength while avoiding the increase of melt viscosity to achieve better melt spinning effect. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high melt strength regenerated polyester fine denier yarn and a production process thereof.

[0005] The technical solution of the present invention is as follows:

[0006] A high melt strength recycled polyester fine denier filament, the raw material components comprising by weight: 100 parts of recycled polyester and 0.5-5 parts of POSS modified polyurethane;

[0007] The POSS modified polyurethane is obtained by reacting polyester polyol with polyisocyanate compound and then reacting with monoamino cage-shaped polysilsesquioxane.

[0008] Preferably, the intrinsic viscosity of the recycled polyester is 0.6-0.85 dL / g.

[0009] Preferably, at least one of the polyester polyol and the polyisocyanate compound has a functionality of 2.

[0010] More preferably, the functionality of the polyester polyol is 2, and the functionality of the polyisocyanate compound is greater than 2;

[0011] Alternatively, the functionality of the polyester polyol is greater than 2, and the functionality of the polyisocyanate compound is 2.

[0012] Preferably, the molar ratio of the OH group in the polyester polyol to the NCO group in the polyisocyanate compound is 1:1.2-2.

[0013] Preferably, the number average molecular weight of the polyester polyol is 600-3000.

[0014] Preferably, the structure of the monoamino cage-shaped polysilsesquioxane is as shown in the following formula (1):

[0015] R 1 NHR 2 R 3 n-1 (SiO 1.5 ) n (1)

[0016] Where R 1 is H, C1-C4 alkyl, cyclopentyl, cyclohexyl or C6-C12 substituted cycloalkyl, R 2 is absent, C1-C6 alkylene or C2-C8 substituted alkylene, R 3 Selected from C1-C8 alkyl, n=6, 8, 10 or 12.

[0017] More preferably, the monoamino cage-type polysilsesquioxane is selected from one or a combination of 3-aminopropylheptamethyl cage-type octasilsesquioxane and 3-aminopropylheptabutyl cage-type octasilsesquioxane.

[0018] Preferably, the ratio of the sum of the molar numbers of hydroxyl groups in the polyester polyol and the amino groups in the monoamino cage-shaped polysilsesquioxane to the molar number of NCO groups in the polyisocyanate compound is 0.9-1.05:1.

[0019] A process for preparing high melt strength regenerated polyester fine denier yarn according to any one of the above technical solutions, comprising: mixing, melt spinning, cooling, stretching, shaping, oiling and winding;

[0020] The cooling is firstly natural cooling in the windless area and then cooling in the ventilation area.

[0021] The beneficial effects of the present invention are:

[0022] (1) The present invention adopts the additive--POSS modified polyurethane mode to improve the melt strength of recycled polyester, and does not affect its melt viscosity, is conducive to reducing the breakage rate of melt spinning, and improves the melt spinning effect. POSS modified polyurethane has a structure in which the end group is POSS and the middle is polyester-polyurethane, which can be a linear structure or a branched structure. The polyester-polyurethane structure in the middle provides good compatibility with recycled polyester, and the POSS structure at both ends has a large volume, which provides good mutual entanglement with recycled polyester macromolecule, thereby improving the melt strength of recycled polyester, and due to the good compatibility of POSS modified polyurethane with recycled polyester, the melt viscosity of recycled polyester is not substantially affected.

[0023] (2) The preparation method of the POSS modified polyurethane of the present invention is relatively simple, and the terminal isocyanate prepolymer is obtained by reacting a polyester polyol and a polyisocyanate compound, and then reacting with a monoamino cage-shaped polysilsesquioxane. By adjusting the molecular weight of the polyester polyol, the molar ratio of the polyester polyol and the polyisocyanate compound, the functionality of the polyester polyol and the polyisocyanate compound, etc., the obtained POSS modified polyurethane has the effect of improving the melt strength of the recycled polyester. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0025] In order to improve the melt strength of recycled polyester and have a lower impact on its melt viscosity, on the one hand, the present invention provides a high melt strength recycled polyester fine denier yarn, the raw material components include by weight: 100 parts of recycled polyester and 0.5-5 parts of POSS modified polyurethane;

[0026] POSS modified polyurethane is obtained by reacting polyester polyol with polyisocyanate compound and then reacting with monoamino cage-shaped polysilsesquioxane.

[0027] POSS is composed of an inorganic core composed of a silicon-oxygen skeleton alternately connected by Si-O and an organic group connected to Si atoms on the top corner, and the three-dimensional size is between 1~3nm, belonging to organic-inorganic hybrid nanomaterials. In order to improve the melt strength of recycled polyester, the present invention introduces a cage-type polysilsesquioxane (POSS) of physical mixing in recycled polyester. In POSS modified polyurethane, the POSS structure at the end can form a stronger mutual entanglement and intermolecular action with the polymer chain of recycled polyester, and the polyester-polyurethane in the middle has good compatibility with the recycled polyester, therefore, POSS modified polyurethane can improve the melt strength of recycled polyester, and also has a certain promotion effect for the mechanical strength of recycled polyester. And, polyester-polyurethane has good compatibility with recycled polyester, plays a good plasticizing effect in a molten state, reduces the adverse effect on melt viscosity caused by introducing POSS modified polyurethane.

[0028] In a preferred embodiment of the present invention, the intrinsic viscosity of the recycled polyester is 0.6-0.85 dL / g. For example, the intrinsic viscosity of the recycled polyester can be any value among 0.6 dL / g, 0.65 dL / g, 0.7 dL / g, 0.75 dL / g, 0.8 dL / g, 0.85 dL / g, etc. or any value therebetween, with no particular limitation. Further, the intrinsic viscosity of the recycled polyester can be 0.7-0.85 dL / g.

[0029] In a preferred embodiment of the present invention, at least one of the polyester polyol and the polyisocyanate compound has a functionality of 2. For polyester polyol, the functionality refers to the number of hydroxyl groups, such as the functionality of polyester diol is 2. For polyisocyanate compounds, the functionality refers to the number of NCO groups, such as the functionality of diisocyanate compounds is 2. The two-functional polyester polyol and / or polyisocyanate compound is conducive to the formation of a certain linear structure.

[0030] In a more preferred embodiment of the present invention, the functionality of the polyester polyol is 2, and the functionality of the polyisocyanate compound is greater than 2;

[0031] Alternatively, the functionality of the polyester polyol is greater than 2, and the functionality of the polyisocyanate compound is 2.

[0032] When the functionality of the polyester polyol and the functionality of the polyisocyanate compound are both 2, a linear polyester-polyurethane structure is formed in theory; when the functionality of one of them is >2, a polyester-polyurethane structure with a certain branched structure can be formed, and after reacting with POSS, the POSS modified polyurethane formed is a branched structure, which can form more and stronger mutual entanglement and intermolecular action with the recycled polyester polymer chain, and improve the melt strength and mechanical strength of the recycled polyester. In the present invention, when the functionality of the polyester polyol or the functionality of the polyisocyanate compound is >2, for example, the polyester polyol can be a combination of a polyester triol or a polyester diol and a polyester triol, and the polyisocyanate compound can be a trimer, such as an HDI trimer, or a combination of a diisocyanate compound and a trimer. For the polyisocyanate compound, it can be a diisocyanate compound and / or a triisocyanate compound. The diisocyanate can be an aliphatic diisocyanate, such as isophorone diisocyanate IPDI, 4,4'-dicyclohexylmethane diisocyanate HMDI, 3,3'-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate HDI, 1,4-cyclohexane diisocyanate, methylcyclohexane diisocyanate, norbornane dimethylene isocyanate and L-lysine diisocyanate, etc. The triisocyanate compound can be an HDI trimer, etc. For example, in order to obtain a polyisocyanate compound with a functionality > 2, a combination of a diisocyanate compound and a trimer can be used. There is no particular restriction on the weight ratio of the diisocyanate compound and the trimer in the combination. For example, the weight ratio can be 10:1-1:10, such as 10:1, 9:1, 7:1, 5:1, 4:1, 2:1, 1:1, 1:2, 1:3, 1:5, 1:7, 1:9, 1:10, etc.

[0033] In a preferred embodiment of the present invention, the molar ratio of the OH group in the polyester polyol to the NCO group in the polyisocyanate compound is 1:1.2-2. For example, the molar ratio of the OH group in the polyester polyol to the NCO group in the polyisocyanate compound can be any value or any value in between 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, etc., without special restrictions. Further, the molar ratio of the OH group in the polyester polyol to the NCO group in the polyisocyanate compound can be 1:1.3-2.

[0034] In a preferred embodiment of the present invention, the number average molecular weight of the polyester polyol is 600-3000. The polyester polyol may be a polycarbonate polyol, a polycaprolactone polyol, etc., such as a polycarbonate diol, a polycarbonate triol, a polycaprolactone diol, a polycaprolactone triol, and may be one or a combination of two or more thereof. For example, in order to obtain a polyester polyol with a functionality > 2, a combination of a polycarbonate diol and a polycarbonate triol may be used. The weight ratio of the polycarbonate diol and the polycarbonate triol in the combination is not particularly limited, for example, the weight ratio may be 10:1-1:10, such as 10:1, 9:1, 7:1, 5:1, 4:1, 2:1, 1:1, 1:2, 1:3, 1:5, 1:7, 1:9, 1:10, etc.

[0035] Monoamino cage-type polysilsesquioxane (monoamino POSS) refers to a cage-type polysilsesquioxane having only one amino group in its molecular structure, which may be a primary amino group or a secondary amino group, and preferably, except for the amino group, the monoamino cage-type polysilsesquioxane does not contain any other functional group that can react with the NCO group at 100° C. One amino group in the monoamino POSS reacts with the prepolymer, bonds to the end group of the prepolymer and introduces the POSS structure. In a preferred embodiment of the present invention, the structure of the monoamino POSS is shown in the following formula (1):

[0036] R 1 NHR 2 R 3 n-1 (SiO 1.5 ) n (1)

[0037] Where R 1 is H, C1-C4 alkyl, cyclopentyl, cyclohexyl or C6-C12 substituted cycloalkyl, R 2 is absent, C1-C6 alkylene or C2-C8 substituted alkylene, R 3 is selected from C1-C8 alkyl, n=6, 8, 10 or 12. That is, in the monoamino POSS structure of the present invention, the amino group is R 1 NHR 2 -Formally manifested.

[0038] In a more preferred embodiment of the present invention, the monoamino cage-type polysilsesquioxane is selected from one or a combination of 3-aminopropyl heptamethyl cage-type octapolysilsesquioxane (3-aminopropyl heptamethyl POSS) and 3-aminopropyl heptabutyl cage-type octapolysilsesquioxane (3-aminopropyl heptabutyl POSS), which is reported in the prior art.

[0039] In a preferred embodiment of the present invention, the ratio of the sum of the molar number of amino groups in hydroxyl group and monoamino POSS in polyester polyol to the molar number of NCO groups in polyisocyanate compound is 0.9-1.05:1. Adopting the above-mentioned molar ratio, it is possible to make the OH, amino and NCO groups in POSS modified polyurethane react completely as far as possible. Further, the ratio of the sum of the molar number of amino groups in hydroxyl group and monoamino POSS in polyester polyol to the molar number of NCO groups in polyisocyanate compound can be 0.95-1.02:1, for example, the ratio can be any value in 0.95:1, 0.96:1, 0.97:1, 0.98:1, 0.99:1, 1:1, 1.01:1, 1.02:1 etc. or any value between them, without particular limitation.

[0040] On the other hand, the present invention provides a preparation process of high melt strength regenerated polyester fine denier yarn as described in any of the above technical solutions, comprising: mixing, melt spinning, cooling, stretching, shaping, oiling and winding. Among them, cooling is first natural cooling in a windless area and then cooling in a ventilation area, so that the fine denier fiber yarn just spun into shape will not be suddenly cooled, avoiding the fine denier fiber yarn becoming brittle, which is not conducive to subsequent processing. The temperature of melt spinning can be 280-285℃.

[0041] The technical solution of the present invention is further described and illustrated according to various embodiments below. Unless otherwise specified, the parts described in the following embodiments are parts by weight.

[0042] Preparation Example 1-7 Preparation of POSS modified polyurethane

[0043] Preparation Example 1

[0044] The molar ratio of polycarbonate diol to HDI is 1:1.6, and the ratio of the sum of the molar numbers of OH groups in polycarbonate diol and amino groups in 3-aminopropylheptamethyl POSS to the molar number of NCO groups in HDI is 1:1.

[0045] Polycarbonate diol (number average molecular weight 1000) and HDI are added to a reaction container, stirred and mixed at room temperature and reacted until the content of NCO groups in the reaction system remains unchanged to obtain a prepolymer; 3-aminopropyl heptamethyl POSS is continuously added to the prepolymer, and stirring is continued at room temperature until the reaction is complete to obtain a POSS modified polyurethane.

[0046] Preparation Example 2

[0047] The difference between this preparation example and preparation example 1 is that in preparation example 1, the polycarbonate diol is adjusted to a combination of equimolar polycarbonate diol (number average molecular weight 1000) and polycarbonate triol (number average molecular weight 1200) in a weight ratio of 4:1. The remaining steps remain unchanged.

[0048] Preparation Example 3

[0049] The difference between this preparation example and preparation example 1 is that in preparation example 1, HDI is adjusted to a combination of equimolar HDI and HDI trimer at a weight ratio of 5:1. The remaining steps remain unchanged.

[0050] Preparation Example 4

[0051] The difference between this preparation example and preparation example 1 is that in preparation example 1, the molar ratio of polycarbonate diol to HDI is adjusted to 1:1.3. The other steps remain unchanged.

[0052] Preparation Example 5

[0053] The difference between this preparation example and preparation example 1 is that in preparation example 1, the molar ratio of polycarbonate diol to HDI is adjusted to 1:2. The other steps remain unchanged.

[0054] Preparation Example 6

[0055] The difference between this preparation example and preparation example 1 is that in preparation example 1, the ratio of the sum of the molar numbers of OH groups in polycarbonate diol and amino groups in 3-aminopropylheptamethyl POSS to the molar number of NCO groups in HDI is adjusted from 1:1 to 0.95:1. The remaining steps remain unchanged.

[0056] Preparation Example 7

[0057] The difference between this preparation example and preparation example 1 is that in preparation example 1, the ratio of the sum of the molar numbers of OH groups in polycarbonate diol and amino groups in 3-aminopropylheptamethyl POSS to the molar number of NCO groups in HDI is adjusted from 1:1 to 1:1.02. The remaining steps remain unchanged.

[0058] Example 1

[0059] Recycled polyester, intrinsic viscosity 0.75dL / g, filtered through a vibrating screen and a melt filter to remove impurities.

[0060] 100 parts of the regenerated polyester after impurity removal and 0.5 parts of the POSS modified polyurethane of Preparation Example 1 were mixed in a mixer, melt-spun at 282°C, cooled (cooled in a 15 cm windless zone and then cooled in a ventilation zone), stretched at a stretching ratio of 4, shaped at 120°C, oiled and rolled to obtain 50D / 144f ultra-fine denier regenerated polyester fiber.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that in embodiment 1, the amount of POSS modified polyurethane in preparation example 1 is adjusted from 0.5 parts to 1.5 parts. The remaining steps remain unchanged.

[0063] Example 3

[0064] The difference between this embodiment and embodiment 1 is that in embodiment 1, the amount of POSS modified polyurethane in preparation example 1 is adjusted from 0.5 parts to 3.5 parts. The remaining steps remain unchanged.

[0065] Example 4

[0066] The difference between this embodiment and embodiment 1 is that in embodiment 1, the amount of POSS modified polyurethane in preparation example 1 is adjusted from 0.5 parts to 5 parts. The remaining steps remain unchanged.

[0067] Comparative Example 1

[0068] The regenerated polyester after impurities removal in Example 1.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 1 is that in Example 1, the POSS modified polyurethane of Preparation Example 1 is replaced by an equal weight of octamethyl POSS. The remaining steps remain unchanged.

[0071] Comparative Example 3

[0072] The difference between this comparative example and Example 1 is that in Example 1, the POSS modified polyurethane of Preparation Example 1 is replaced by an equal weight of polyester-polyurethane. The remaining steps remain unchanged.

[0073] The preparation method of polyester-polyurethane is as follows:

[0074] The molar ratio of polycarbonate diol, anhydrous ethanol and HDI is 1:3:1.6.

[0075] Polycarbonate diol (number average molecular weight 1000) and HDI are added to a reaction container, stirred and mixed at room temperature and reacted until the content of NCO groups in the reaction system remains unchanged, anhydrous ethanol is continued to be added, and the reaction is continued until no NCO groups are detected in the reaction system, and the temperature is raised to 90° C. to remove excess anhydrous ethanol to obtain the product.

[0076] Example 5

[0077] Recycled polyester, intrinsic viscosity 0.75dL / g, filtered through a vibrating screen and a melt filter to remove impurities.

[0078] 100 parts of the regenerated polyester after impurity removal and 2 parts of the POSS modified polyurethane of Preparation Example 1 were mixed in a mixer, melt-spun at 282°C, cooled (cooled in a 15 cm windless zone and then cooled in a ventilation zone), stretched at a stretching ratio of 3.7, shaped at 120°C, oiled and rolled to obtain 50D / 144f ultra-fine denier regenerated polyester fiber.

[0079] Example 6

[0080] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 2. The remaining steps remain unchanged.

[0081] Example 7

[0082] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 3. The remaining steps remain unchanged.

[0083] Example 8

[0084] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 4. The remaining steps remain unchanged.

[0085] Example 9

[0086] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 5. The remaining steps remain unchanged.

[0087] Example 10

[0088] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 6. The remaining steps remain unchanged.

[0089] Embodiment 11

[0090] The difference between this embodiment and embodiment 5 is that in embodiment 5, the POSS modified polyurethane of preparation example 1 is replaced by an equal weight of the POSS modified polyurethane of preparation example 7. The remaining steps remain unchanged.

[0091] Performance Testing

[0092] Relative melt strength: The melt strength of the melt at 280°C is tested using a melt strength tester, with the melt strength of the recycled polyester in Comparative Example 1 being 1, and the relative melt strengths of the remaining embodiments and comparative examples being the ratio of the tested melt strength to the melt strength of the recycled polyester in Comparative Example 1.

[0093] Melt viscosity: measured at 280°C using a cone-plate viscometer with a shear rate of 10,000 s -1 .

[0094] Tensile strength: tested according to the method of GB / T3916-2013.

[0095] The results are shown in Table 1 below.

[0096] Table 1

[0097]

[0098]

[0099] It can be seen from the data results in Table 1 that the present invention adds POSS modified polyurethane to the recycled polyester, which can significantly improve the melt strength and tensile strength of the recycled polyester and has a relatively low impact on the melt viscosity.

[0100] During the melt spinning process of the recycled polyester of Comparative Example 1 and the high melt strength recycled polyester of Example 2, the average yarn breakage per hour in Comparative Example 1 was 0.5 and the waste yarn rate was 12.5%, while the average yarn breakage per hour in Example 2 was 0.08 and the waste yarn rate was 1.0%. It can be seen that the high melt strength recycled polyester of Example 2 can significantly improve the stability and production efficiency of fine denier yarn spinning.

[0101] As described above, the basic principles, main features and advantages of the present invention are shown and described. Those skilled in the art should understand that the present invention is not limited by the above embodiments, which are only preferred embodiments of the present invention and cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the scope of the present invention and the content of the specification should still be within the scope of the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high melt strength regenerated polyester fine denier fiber, characterized in that: The raw material components include, by weight: 100 parts of recycled polyester and 0.5-5 parts of POSS modified polyurethane; The POSS modified polyurethane is obtained by reacting polyester polyol with polyisocyanate compound and then reacting with monoamino cage-shaped polysilsesquioxane.

2. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The intrinsic viscosity of the recycled polyester is 0.6-0.85 dL / g.

3. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The functionality number of at least one of the polyester polyol and the polyisocyanate compound is 2.

4. The high melt strength regenerated polyester fine denier fiber according to claim 3, characterized in that: The functionality of the polyester polyol is 2, and the functionality of the polyisocyanate compound is greater than 2; Alternatively, the functionality of the polyester polyol is greater than 2, and the functionality of the polyisocyanate compound is 2.

5. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The molar ratio of the OH group in the polyester polyol to the NCO group in the polyisocyanate compound is 1:1.2-2.

6. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The number average molecular weight of the polyester polyol is 600-3000.

7. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The structure of the monoamino cage-shaped polysilsesquioxane is shown in the following formula (1): R 1 NHR 2 R 3 n-1 (SiO 1.5 ) n (1) Where R 1 is H, C1-C4 alkyl, cyclopentyl, cyclohexyl or C6-C12 substituted cycloalkyl, R 2 is absent, C1-C6 alkylene or C2-C8 substituted alkylene, R 3 Selected from C1-C8 alkyl, n=6, 8, 10 or 12.

8. The high melt strength regenerated polyester fine denier fiber according to claim 7, characterized in that: The monoamino cage-type polysilsesquioxane is selected from one or a combination of 3-aminopropyl heptamethyl cage-type octasilsesquioxane and 3-aminopropyl heptabutyl cage-type octasilsesquioxane.

9. The high melt strength regenerated polyester fine denier fiber according to claim 1, characterized in that: The ratio of the sum of the molar numbers of hydroxyl groups in the polyester polyol and the amino groups in the monoamino cage-shaped polysilsesquioxane to the molar number of NCO groups in the polyisocyanate compound is 0.9-1.05:

1.

10. A process for preparing high melt strength regenerated polyester fine denier fiber according to any one of claims 1 to 9, characterized in that: include: Mixing, melt spinning, cooling, stretching, shaping, oiling and winding; The cooling is firstly natural cooling in the windless area and then cooling in the ventilation area.

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