Composition for preparing elastic fiber, elastic fiber as well as preparation method and application of elastic fiber

Abstract

The invention relates to the technical field of fiber processing, and discloses a composition for preparing elastic fibers, the elastic fibers and a preparation method and application of the elastic fibers. The composition contains a styrene-ethylene-butylene-styrene block copolymer, expanded graphite and a halogen-free flame retardant, relative to 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 12.5 to 350 parts by weight, and the content of the halogen-free flame retardant is 40 to 125 parts by weight; the average particle diameter of the expanded graphite is 45-55 [mu] m, and the expansion volume is 100-120 mL / g; the halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a content weight ratio of 1: (2-6). When the composition provided by the invention is applied to elastic fibers, the composition not only has good anti-static capability and flame-retardant capability, but also has excellent mechanical properties and rebound resilience.

Description

Technical Field

[0001] The invention relates to the technical field of fiber processing, and in particular to a composition for preparing elastic fibers, the elastic fibers, and a preparation method and application thereof. Background Art

[0002] Among the clothing, decorations and industrial products used in textile materials, most are required to have flame retardant properties, such as children's clothing, special industry clothing, textile decorations used in public places such as hotels and entertainment, textiles for transportation, textiles for packaging, etc. Therefore, flame retardant textile materials have broad application prospects and requirements.

[0003] ABA terpolymer based on styrene-ethylene-butylene-styrene block copolymer (SEBS) is an excellent choice for melt spinning to prepare elastic fibers because of its strong aging resistance, non-toxicity and odorlessness, and compliance with food and medical hygiene standards. However, SEBS itself has average flame retardancy. Once it encounters a fire source, it will burn rapidly in the presence of oxygen-assisted combustion, which may endanger personal and property safety. In a dry environment, the friction between the fiber and the charged particles in the air is also likely to generate static electricity, and the accumulated static electricity is also very likely to generate static sparks, which also poses a serious safety hazard.

[0004] At the same time, conventional SEBS is difficult to spin alone into elastic fibers with excellent performance due to its large molecular weight and high melt viscosity.

[0005] CN109836756A discloses an antistatic, high-efficiency, low-smoke, halogen-free, flame-retardant thermoplastic elastomer, which is characterized by being composed of the following components in percentage by weight: 10-50% styrene elastomer, 5-30% polyphenylene ether resin, 2-25% polyolefin resin, 5-50% mineral oil, 2-50% halogen-free flame retardant, 0-10% flame retardant synergist, 1-20% antistatic agent, 0.05-2% antioxidant, 0.1-10% lubricant, and 0.1-10% other additives.

[0006] CN102786764A discloses a scratch-resistant halogen-free flame-retardant thermoplastic elastomer composition, which is characterized in that it comprises the following components by weight percentage: 15-50% of polyphenylene ether resin, 20-40% of styrene-based thermoplastic elastomer, 10-30% of solid halogen-free flame retardant, 0.5-5% of flame retardant synergist, 5-20% of plasticizer, and 5-20% of scratch-resistant agent.

[0007] The above scheme has a complex system, and the polymer used in the scheme has a high molecular weight and a low melt index, which does not meet the conditions for preparing elastic fibers. Summary of the invention

[0008] The purpose of the present invention is to solve the problem that the antistatic, flame retardant and mechanical properties of the elastic fiber in the prior art cannot be taken into account at the same time.

[0009] The inventors have discovered that by compounding styrene-ethylene-butylene-styrene block copolymer, a specific type of halogen-free flame retardant and expanded graphite in a specific ratio, elastic fibers prepared using such a composition have higher mechanical strength and better antistatic and flame retardant properties; in view of this, the inventors have completed the solution of the present invention.

[0010] In order to achieve the above object, the first aspect of the present invention provides a composition for preparing elastic fibers, wherein the composition contains the following components which are stored separately or mixed:

[0011] Styrene-ethylene-butylene-styrene block copolymer, expanded graphite, halogen-free flame retardant;

[0012] Relative to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 12.5-350 parts by weight, and the content of the halogen-free flame retardant is 40-125 parts by weight;

[0013] The average particle diameter of the expanded graphite is 45-55 μm, and the expansion volume is 100-120 mL / g;

[0014] The halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a weight ratio of 1:2-6.

[0015] The second aspect of the present invention provides a method for preparing elastic fibers, the method using the composition of the first aspect, comprising:

[0016] (1) melt-extruding a mixture containing styrene-ethylene-butylene-styrene block copolymer, expanded graphite and a halogen-free flame retardant to obtain a masterbatch;

[0017] (2) drying and melt-spinning the masterbatch in sequence to obtain the elastic fiber;

[0018] Relative to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the amount of the expanded graphite is 12.5-350 parts by weight, and the amount of the halogen-free flame retardant is 40-125 parts by weight.

[0019] The third aspect of the present invention provides an elastic fiber prepared by the method described in the second aspect.

[0020] The fourth aspect of the present invention provides application of the elastic fiber described in the third aspect in the textile field.

[0021] When the composition provided by the present invention is applied to elastic fibers, it not only has good antistatic ability and flame retardancy, but also has excellent mechanical properties and resilience. DETAILED DESCRIPTION

[0022] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0023] As mentioned above, the first aspect of the present invention provides a composition for preparing elastic fibers, wherein the composition contains the following components which are stored separately or mixed:

[0024] Styrene-ethylene-butylene-styrene block copolymer, expanded graphite, halogen-free flame retardant;

[0025] Relative to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 12.5-350 parts by weight, and the content of the halogen-free flame retardant is 40-125 parts by weight;

[0026] The average particle diameter of the expanded graphite is 45-55 μm, and the expansion volume is 100-120 mL / g;

[0027] The halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a weight ratio of 1:2-6.

[0028] Preferably, with respect to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 15-20 parts by weight, and the content of the halogen-free flame retardant is 50-75 parts by weight.

[0029] Preferably, the average particle diameter of the expanded graphite is 45-48 μm, and the expanded volume is 110-120 mL / g. The inventors found that under this preferred embodiment, the elastic fiber obtained by the present invention has better mechanical properties and antistatic and flame retardant properties.

[0030] Preferably, the halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a weight ratio of 1:2-4. The inventors found that under this preferred embodiment, the elastic fiber obtained by the present invention has better mechanical properties and antistatic and flame retardant properties.

[0031] Preferably, the styrene structural unit content of the styrene-ethylene-butylene-styrene block copolymer is 15-30wt%, the Shore A hardness is 50-60, the melt index (230°C, 2.16Kg) is 210-220g / min or the melt index (200°C, 5Kg) is 25-35g / min.

[0032] As mentioned above, the second aspect of the present invention provides a method for preparing elastic fibers, which is carried out using the composition described in the first aspect, comprising:

[0033] (1) melt-extruding a mixture containing styrene-ethylene-butylene-styrene block copolymer, expanded graphite and a halogen-free flame retardant to obtain a masterbatch;

[0034] (2) drying and melt-spinning the masterbatch in sequence to obtain the elastic fiber;

[0035] Relative to 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the amount of the expanded graphite is 12.5-350 parts by weight, and the amount of the halogen-free flame retardant is 40-125 parts by weight.

[0036] Preferably, the temperature of the melt extrusion I is 160-175°C.

[0037] Preferably, the drying conditions include: a temperature of 80-100° C. and a time of 20-24 hours.

[0038] Preferably, in step (2), the melt spinning step comprises: melt extrusion, melt extrusion II, receiving and winding; the temperature of the melt extrusion and melt extrusion II are both 160-175°C.

[0039] More preferably, the melt spinning step further comprises: filtering and metering in sequence before melt extrusion II; the filtering and metering temperatures are both 160-175°C.

[0040] It should be noted that, in the present invention, each step of the melt spinning is carried out by a conventional method in the art, which will not be described in detail herein, and those skilled in the art should not interpret this as a limitation to the present invention.

[0041] Preferably, the receiving and winding temperatures are both 90-100° C., and the winding rotation speed is 50-200 rpm.

[0042] Preferably, in step (2), the melt spinning is carried out in a melt spinning machine.

[0043] It should be noted that, in the present invention, the temperatures of different areas of the melt spinning machine are different, and the speeds of different rollers in the winding process are also different, so the conditions of the melt spinning are all achieved within the aforementioned range. The present invention will not be elaborated here, and those skilled in the art should not be understood as limiting the present invention.

[0044] As mentioned above, the third aspect of the present invention provides elastic fibers prepared by the method described in the second aspect.

[0045] As mentioned above, the fourth aspect of the present invention provides the use of the elastic fiber described in the third aspect in the textile field.

[0046] The present invention will be described in detail below by way of examples.

[0047] In the following examples, unless otherwise specified, the experimental instruments, reagents and raw materials involved are all commercially available, and the reagents are all analytically pure products.

[0048] In the following examples, each part by weight represents 1 g unless otherwise specified.

[0049] raw material

[0050] Styrene-ethylene-butylene-styrene block copolymer: model MD-1648, the content of styrene structural unit is 20wt%, the Shore A hardness is 52, and the melt index is 220g / 10min (230°C, 2.16Kg), purchased from Kraton, USA; model YH-505, the content of styrene structural unit is 20wt%, the Shore A hardness is 56, and the melt index is 30g / 10min (200°C, 5Kg), purchased from Sinopec Baling Petrochemical Co., Ltd.; model YH-503, the content of styrene structural unit is 33wt%, the Shore A hardness is 74, purchased from Sinopec Baling Petrochemical Co., Ltd.;

[0051] Expanded graphite I: the average particle diameter is 48 μm, the expansion volume is 110 mL / g, purchased from Qingdao Dongkai Graphite Co., Ltd.

[0052] Expanded graphite II: the average particle diameter is 46 μm, the expansion volume is 120 mL / g, purchased from Qingdao Dongkai Graphite Co., Ltd.

[0053] Expanded graphite III: the average particle diameter is 52 μm, the expansion volume is 100 mL / g, purchased from Qingdao Dongkai Graphite Co., Ltd.

[0054] Expanded graphite IV: the average particle diameter is 75 μm, the expansion volume is 150 mL / g, purchased from Qingdao Dongkai Graphite Co., Ltd.

[0055] Expanded graphite V: the average particle diameter is 38 μm, the expansion volume is 80 mL / g, purchased from Qingdao Dongkai Graphite Co., Ltd.

[0056] Example 1

[0057] This example is used to illustrate that the elastic fiber of the present invention is prepared according to the formula and process parameters in Table 1 and the method described below.

[0058] Step 1: melt-extrude a mixture containing styrene-ethylene-butylene-styrene block copolymer, expanded graphite and halogen-free flame retardant to obtain a masterbatch; the temperature of the melt-extruded I is 170° C.;

[0059] Step 2: drying, melt extrusion, filtering, metering, melt extrusion II, receiving and winding the masterbatch in sequence to obtain the elastic fiber; the drying temperature is 100°C and the time is 20h; the temperature of melt extrusion, filtering, metering and melt extrusion II is 160-175°C; the temperature of receiving and winding is 90-100°C; and the winding speed is 50-200rpm.

[0060] Unless otherwise specified, the remaining examples were carried out using a process similar to that of Example 1, except that the formulations and process parameters used in each example were different, see Table 1 for details (Note: the parameters not listed in Table 1 are the same as the corresponding parameters in Example 1).

[0061] Table 1

[0062]

[0063]

[0064] Comparative Example 1

[0065] This comparative example was carried out in a similar process to that of Example 1, except that an equal mass of aluminum hydroxide was used to replace the combination of aluminum hydroxide and aluminum hypophosphite in Example 1.

[0066] The rest are the same as in Example 1.

[0067] The elastic fiber DS1 was prepared.

[0068] Comparative Example 2

[0069] This comparative example was carried out in a similar process to that of Example 1, except that an equal mass of aluminum hypophosphite was used to replace the combination of aluminum hydroxide and aluminum hypophosphite in Example 1.

[0070] The rest are the same as in Example 1.

[0071] The elastic fiber DS2 was prepared.

[0072] Comparative Example 3

[0073] This comparative example was carried out in a similar process to that of Example 1, except that the mass ratio of aluminum hydroxide to aluminum hypophosphite in this comparative example was 1:9.

[0074] The rest are the same as in Example 1.

[0075] The elastic fiber DS3 was prepared.

[0076] Comparative Example 4

[0077] This comparative example was carried out in a similar process to that of Example 1, except that the mass ratio of aluminum hydroxide to aluminum hypophosphite in this comparative example was 1:1.

[0078] The rest are the same as in Example 1.

[0079] Elastic fiber DS4 was prepared.

[0080] Comparative Example 5

[0081] This comparative example was carried out in a similar process to that of Example 1, except that an equal mass of expanded graphite IV was used to replace the expanded graphite I in Example 1.

[0082] The rest are the same as in Example 1.

[0083] The elastic fiber DS5 was prepared.

[0084] Comparative Example 6

[0085] This comparative example was carried out in a similar process to that of Example 1, except that an equal mass of expanded graphite V was used to replace the expanded graphite I in Example 1.

[0086] The rest are the same as in Example 1.

[0087] Elastic fiber DS6 was prepared.

[0088] Comparative Example 7

[0089] This comparative example was carried out in a similar process to that of Example 1, except that the amount of expanded graphite I used in this comparative example was 10 parts by weight, and the amount of halogen-free flame retardant used was 20 parts by weight.

[0090] The rest are the same as in Example 1.

[0091] The elastic fiber DS7 was prepared.

[0092] Comparative Example 8

[0093] This comparative example was carried out in a similar process to that of Example 1, except that the amount of expanded graphite I used in this comparative example was 30 parts by weight, and the amount of halogen-free flame retardant used was 150 parts by weight.

[0094] The rest are the same as in Example 1.

[0095] The elastic fiber DS8 was prepared.

[0096] Test Case

[0097] The same method was used to test the properties of the elastic fibers prepared in the embodiment and the comparative example. The results are shown in Table 2.

[0098] 1. Use a surface resistance tester (model CXT2682A, manufacturer Changzhou Xinyang Electronic Technology Co., Ltd.) to measure the surface resistance of the elastic fiber;

[0099] 2. Use a vertical combustion tester (model ST-5725, manufacturer Xiamen Easy Instrument Co., Ltd.) to measure the flame retardant properties of elastic fibers;

[0100] 3. The tensile strength and elongation at break of the elastic fiber were measured using a universal material mechanical properties tester (model UTM4104, manufacturer: Shenzhen Sansi Zongheng Technology Co., Ltd.).

[0101] 4. Use a universal material mechanical properties tester (model UTM4104, manufacturer Shenzhen Sansi Zongheng Technology Co., Ltd.) to stretch the sample at a length of 5 cm and a stretching speed of 500 mm / min. The stretching length is 200%, and then the sample is recovered at a speed of 500 mm / min.

[0102] Table 2

[0103]

[0104]

[0105] It can be seen from the results in Table 2 that the elastic fiber obtained by the present invention has better antistatic, flame retardant and mechanical properties.

[0106] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A composition for preparing elastic fibers, It is characterized in that The composition contains the following components which are stored separately or mixed together: Styrene-ethylene-butylene-styrene block copolymer, expanded graphite, halogen-free flame retardant; Relative to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 12.5-350 parts by weight, and the content of the halogen-free flame retardant is 40-125 parts by weight; The average particle diameter of the expanded graphite is 45-55 μm, and the expansion volume is 100-120 mL / g; The halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a weight ratio of 1:2-6.

2. The composition according to claim 1, It is characterized in that Relative to 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the content of the expanded graphite is 15-20 parts by weight, and the content of the halogen-free flame retardant is 50-75 parts by weight.

3. The composition according to claim 1 or 2, It is characterized in that The average particle diameter of the expanded graphite is 45-48 μm, and the expanded volume is 110-120 mL / g.

4. A composition according to any one of claims 1 to 3, It is characterized in that The halogen-free flame retardant is a combination of aluminum hydroxide and aluminum hypophosphite in a weight ratio of 1:2-4.

5. A composition according to any one of claims 1 to 4, It is characterized in that The styrene structural unit content of the styrene-ethylene-butylene-styrene block copolymer is 15-30wt%, the Shore A hardness is 50-60, the melt index at 230°C and 2.16Kg is 210-220g / min, or the melt index at 200°C and 5Kg is 25-35g / min.

6. A method for preparing elastic fibers, It is characterized in that The method is carried out using the composition described in any one of claims 1 to 5, comprising: (1) melt-extruding a mixture containing styrene-ethylene-butylene-styrene block copolymer, expanded graphite and a halogen-free flame retardant to obtain a masterbatch; (2) drying and melt-spinning the masterbatch in sequence to obtain the elastic fiber; Relative to every 100 parts by weight of the styrene-ethylene-butylene-styrene block copolymer, the amount of the expanded graphite is 12.5-350 parts by weight, and the amount of the halogen-free flame retardant is 40-125 parts by weight.

7. The method according to claim 6, It is characterized in that In step (1), the temperature of the melt extrusion I is 160-175°C.

8. The method according to claim 6 or 7, It is characterized in that In step (2), the melt spinning step includes: sequentially performing melt extrusion, melt extrusion II, receiving and winding; the temperature of the melt extrusion and melt extrusion II are both 160-175°C; And / or, the receiving and winding temperatures are both 90-100° C., and the winding rotation speed is 50-200 rpm.

9. Elastic fiber prepared by the method according to any one of claims 6 to 8.

10. Use of the elastic fiber according to claim 9 in the textile field.

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