Continuous dynamic thermal cross-linked polyolefin elastic fiber and manufacturing method therefor

Abstract

The present invention relates to the field of fiber materials and preparation. Provided are a continuous dynamic thermal cross-linked polyolefin elastic fiber and a manufacturing method therefor. The continuous dynamic thermal cross-linked polyolefin elastic fiber comprises a polyolefin, an elastomer, a cross-linking agent and a cross-linking assistant, wherein the polyolefin comprises polyethylene and polypropylene; the elastomer comprises a styrene-ethylene-butylene-styrene block copolymer, a styrene-butadiene-styrene block copolymer and an ethylene-propylene-diene monomer; the cross-linking agent comprises dicumyl peroxide, benzoyl peroxide, benzoyl peroxide and dicumyl hydroperoxide; and the cross-linking assistant comprises triallyl isocyanurate and triallyl isocyanurate. Provided in the present invention are an elastic fiber, which has a low material cost, is more resistant to temperature and has a better fiber rebound rate, and a production method for the elastic fiber.

Description

Continuous dynamic heat-crosslinked polyolefin elastic fiber and its manufacturing method Technical Field

[0001] The present invention relates to the field of fiber materials and preparation, in particular to continuous dynamic heat-crosslinked polyolefin elastic fiber and a manufacturing method thereof. Background Art

[0002] Fiber materials are one of the most common materials in our daily lives. Industries such as textiles, construction, defense, and automobiles require a large amount of high-performance or specialty fiber materials. As a specialized application branch of fiber materials, elastic fiber is also widely used in various industries.

[0003] In the existing technology, patent CN116163072A "A melt-spun elastic fiber layer composite material and its manufacturing process" introduces a method for preparing non-woven fabric materials from polyolefin and polyurethane materials. It focuses on elastic materials such as polyurethane materials, has a low temperature resistance level and high cost, and the fiber produced by this method has a narrow application range and can only be used in the non-woven fabric industry. Technical issues

[0004] The continuous dynamic heat-crosslinked polyolefin elastic fiber and the manufacturing method thereof provided by the present invention can provide an elastic fiber with low material cost and better temperature resistance. Technical Solutions

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The continuous dynamic heat-crosslinked polyolefin elastic fiber provided by the present invention comprises a polyolefin, an elastomer, a crosslinking agent and a crosslinking aid; the polyolefin comprises polyethylene and polypropylene; the elastomer comprises styrene-ethylene-butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, and EPDM rubber; the crosslinking agent comprises dicumyl oxide, benzoyl peroxide, benzoyl peroxide, and dicumyl hydroperoxide; and the crosslinking aid comprises triallyl isocyanurate and triallyl isocyanurate.

[0007] In the continuous dynamically heat-crosslinked polyolefin elastic fiber provided by the present invention, preferably, the weight percentage of the polyolefin in all components is 50%-90%; the weight percentage of the elastomer in all components is 7%-47%.

[0008] In the continuous dynamically heat-crosslinked polyolefin elastic fiber provided by the present invention, preferably, the percentage of the crosslinking agent in the total components is 0.5%-2.5%.

[0009] In the continuous dynamically heat-crosslinked polyolefin elastic fiber provided by the present invention, preferably, the percentage of the auxiliary crosslinking agent in the total components is 0.1%-0.5%.

[0010] The present invention provides a method for producing continuously dynamically heat-crosslinked polyolefin elastic fibers, comprising the following steps:

[0011] S1: mixing polyolefin, elastomer, cross-linking agent and co-cross-linking agent in proportion through a high-speed mixing process to obtain a mixed material;

[0012] S2: The mixture obtained in S1 is subjected to a twin-screw mixing and granulation process to obtain particles;

[0013] S3: vacuum drying the particles obtained in S2 to obtain dehydrated particles;

[0014] S4: The dehydrated particles obtained in S3 are subjected to a single-screw spinning process to obtain nascent fibers;

[0015] S5: The spun fibers obtained in S4 are subjected to secondary drawing to obtain finished fibers;

[0016] S6: Winding up the finished fiber product obtained in S5.

[0017] In the method for producing the continuous dynamic heat-crosslinked polyolefin elastic fiber provided by the present invention, preferably, the mixing speed in step S1 is 900-1500 rpm and the mixing time is 1-5 minutes.

[0018] In the method for producing continuous dynamic heat-crosslinked polyolefin elastic fibers provided by the present invention, preferably, during the granulation process in step S2, the granulation temperature is 120° C.-240° C., the screw speed is 75-300 rpm, and the melting time is 3-15 minutes.

[0019] In the method for producing continuous dynamic heat-crosslinked polyolefin elastic fibers provided by the present invention, preferably, the vacuum drying time in step S3 is 24-72 hours; and the moisture content of the obtained dehydrated particles is less than 50 ppm.

[0020] In the method for producing continuous dynamic heat-crosslinked polyolefin elastic fibers provided by the present invention, preferably, the spinning temperature of the single-screw spinning process in step S4 is 120-240° C.; the spinning melt pressure is 5-35 MPa; and the spinning speed is 10-50 m / min.

[0021] The method for producing continuous dynamic heat-crosslinked polyolefin elastic fibers provided by the present invention preferably comprises the following steps: in step S4, the spun fibers in step S5 are subjected to a continuous secondary drawing process at 120°C-185°C; and the total drawing rate of the obtained finished fiber is 200%-500%. Beneficial effects

[0022] The continuous dynamic heat-crosslinked polyolefin elastic fiber provided by the present invention effectively increases the use temperature of the polyolefin elastic fiber material and can effectively increase the long-term use temperature by 10-20° C.; and effectively increases the resilience of the polyolefin elastic fiber.

[0023] The present invention utilizes a one-time production process for continuous dynamic heat-crosslinked polyolefin elastic fibers, has low raw material costs, and can realize batch continuous production using existing fiber production equipment, thereby fully and effectively reducing costs.

[0024] The long-term use temperature of the polyethylene elastic fiber prepared by the method of the present invention can be increased to 90°C; the elastic fiber has a 200% fixed elongation and a rebound rate of 80%-95%; and a 300% fixed elongation and a rebound rate of 50%-75%. The long-term use temperature of the polypropylene elastic fiber can be increased to 140°C; the 200% fixed elongation and rebound rate reaches 75%-90%; and the 300% fixed elongation and rebound rate reaches 50%-70%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preparation method of the continuous dynamic heat-crosslinked polyolefin elastic fiber involved in the invention is shown in Figure 1. The molding process and process characteristics of the material of the present invention will be more clear and easy to understand, with the focus on highlighting the unique innovation of the patent of the present invention in terms of material combination and process flow.

[0026] FIG1 is a wireframe diagram of the molding process flow of the preparation method of continuous dynamic thermal cross-linking polyolefin elastic fiber. Best Mode for Carrying Out the Invention

[0027] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. It should be noted that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0028] In view of the deficiencies in the prior art, the inventors have proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principles will be further explained below.

[0029] The continuous dynamic heat-crosslinked polyolefin elastic fiber provided by the present invention is an elastic fiber with excellent performance and low cost prepared through an innovative raw material formula and a high-demand spinning equipment process.

[0030] As one aspect of the technical solution of the present invention, the types and characteristic requirements of the polymer materials of polyolefin elastic fibers are provided: the main polymer materials include polyethylene (PE), polypropylene (PP), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), and ethylene propylene diene monomer (EPDM) materials; the auxiliary agents include cross-linking agents diisopropylbenzene oxide (DCP), benzoyl peroxide (BPO), benzoyl peroxide (DTBP), and diisopropylbenzene hydroperoxide (DBHP); and the auxiliary cross-linking agents triallyl isocyanurate (TAIC) and triallyl isocyanurate (TAC).

[0031] As one aspect of the technical solution of the present invention, a forming process method for polyolefin elastic fibers is provided: a twin-screw melt blending extrusion granulation process and a single-screw extrusion spinning process.

[0032] The polyolefin material is polypropylene resin, with a weight percentage of 85%; the elastomer is ethylene propylene diene monomer rubber resin, with a weight percentage of 13%; the cross-linking agent is dicumyl peroxide material, with a weight percentage of 1.5%; the auxiliary cross-linking agent is triallyl isocyanurate, with a weight percentage of 0.5%;

[0033] High-speed mixing process: 1250 rpm, mixing time 3 minutes;

[0034] Twin-screw extruder melt mixing granulation process: equipment temperature 160℃-220℃, screw speed 120 rpm, melting time 12 minutes;

[0035] The single-screw extruder has a spinning temperature of 200°C, a spinning melt pressure of 15 MPa, and a spinning speed of 25 m / min to produce nascent fibers; the continuous secondary drawing temperature is 175°C, and the total drawing rate is 400%;

[0036] Finished polypropylene elastic fiber performance: 200% fixed elongation elastic recovery rate 85%, 300% fixed elongation elastic recovery rate 69%, long-term use temperature is 135℃; Modes for Carrying Out the Invention

[0037] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. It should be noted that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0038] In view of the deficiencies in the prior art, the inventors have proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principles will be further explained below.

[0039] The continuous dynamic heat-crosslinked polyolefin elastic fiber provided by the present invention is an elastic fiber with excellent performance and low cost prepared through an innovative raw material formula and a high-demand spinning equipment process.

[0040] As one aspect of the technical solution of the present invention, the types and characteristic requirements of the polymer materials of polyolefin elastic fibers are provided: the main polymer materials include polyethylene (PE), polypropylene (PP), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), and ethylene propylene diene monomer (EPDM) materials; the auxiliary agents include cross-linking agents diisopropylbenzene oxide (DCP), benzoyl peroxide (BPO), benzoyl peroxide (DTBP), and diisopropylbenzene hydroperoxide (DBHP); and the auxiliary cross-linking agents triallyl isocyanurate (TAIC) and triallyl isocyanurate (TAC).

[0041] As one aspect of the technical solution of the present invention, a forming process method for polyolefin elastic fibers is provided: a twin-screw melt blending extrusion granulation process and a single-screw extrusion spinning process. Embodiment 1:

[0042] The polyolefin material is polyethylene resin, with a weight percentage of 75%; the elastomer is ethylene propylene diene monomer rubber resin, with a weight percentage of 22%; the cross-linking agent is dicumyl peroxide material, with a weight percentage of 2.5%; the auxiliary cross-linking agent is triallyl isocyanurate, with a weight percentage of 0.5%;

[0043] High-speed mixing process: 1250 rpm, mixing time 3 minutes;

[0044] Twin-screw extruder melt mixing granulation process: equipment temperature 120℃-160℃, screw speed 150 rpm, melting time 8 minutes;

[0045] The single-screw extruder has a spinning temperature of 160°C, a spinning melt pressure of 10 MPa, and a spinning speed of 20 m / min to produce nascent fibers; the continuous secondary drawing temperature is 150°C, and the total drawing rate is 300%;

[0046] Finished polyethylene elastic fiber performance: 200% fixed elongation elastic recovery rate is 93%, 300% fixed elongation elastic recovery rate is 81%, long-term use temperature is 85℃. Example 2:

[0047] The polyolefin material is polypropylene resin, with a weight percentage of 85%; the elastomer is ethylene propylene diene monomer rubber resin, with a weight percentage of 13%; the cross-linking agent is dicumyl peroxide material, with a weight percentage of 1.5%; the auxiliary cross-linking agent is triallyl isocyanurate, with a weight percentage of 0.5%;

[0048] High-speed mixing process: 1250 rpm, mixing time 3 minutes;

[0049] Twin-screw extruder melt mixing granulation process: equipment temperature 160℃-220℃, screw speed 120 rpm, melting time 12 minutes;

[0050] The single-screw extruder has a spinning temperature of 200°C, a spinning melt pressure of 15 MPa, and a spinning speed of 25 m / min to produce nascent fibers; the continuous secondary drawing temperature is 175°C, and the total drawing rate is 400%;

[0051] Finished polypropylene elastic fiber performance: 200% fixed elongation elastic recovery rate 85%, 300% fixed elongation elastic recovery rate 69%, long-term use temperature is 135℃; Example 3:

[0052] The polyolefin material is polyethylene resin, with a weight percentage of 70%; the elastomer is styrene-ethylene-butylene-styrene block copolymer, with a weight percentage of 28%; the cross-linking agent is dicumyl peroxide, with a weight percentage of 1.5%; and the auxiliary cross-linking agent is triallyl isocyanurate, with a weight percentage of 0.5%;

[0053] High-speed mixing process: 1250 rpm, mixing time 3 minutes;

[0054] Twin-screw extruder melt mixing granulation process: equipment temperature 120℃-160℃, screw speed 150 rpm, melting time 8 minutes;

[0055] The single-screw extruder has a spinning temperature of 160°C, a spinning melt pressure of 20 MPa, and a spinning speed of 33 m / min, producing nascent fibers; the continuous secondary drawing temperature is 150°C, and the total drawing rate is 400%;

[0056] Finished polyethylene elastic fiber performance: 200% fixed elongation elastic recovery rate of 95%, 300% fixed elongation elastic recovery rate of 83%, long-term use temperature is 90 ℃. Industrial Applicability

[0057] The continuous dynamic heat-crosslinked polyolefin elastic fiber and its manufacturing method provided in Example 1 of the present invention make the material cost and processing cost of the elastic fiber low (the large-scale production method of existing fiber production equipment makes the processing cost low), and the elastic fiber produced is more temperature-resistant and has a higher fiber rebound rate than the existing technology. Sequence Listing Free Content

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A continuous dynamically heat-crosslinked polyolefin elastic fiber, characterized in that: including polyolefin, elastomer, cross-linking agent and auxiliary cross-linking agent; The polyolefins include polyethylene and polypropylene; The elastomer includes styrene-ethylene-butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, and EPDM; The cross-linking agent includes dicumyl oxide, benzoyl peroxide, benzoyl peroxide and dicumyl hydroperoxide; The auxiliary cross-linking agent includes triallyl isocyanurate and triallyl isocyanurate.

2. The continuous dynamically heat-crosslinked polyolefin elastic fiber according to claim 1, characterized in that: The weight percentage of the polyolefin in all components is 50%-90%; the weight percentage of the elastomer in all components is 7%-47%.

3. The continuous dynamically heat-crosslinked polyolefin elastic fiber according to claim 2, characterized in that: The percentage of the cross-linking agent in the total components is 0.5%-2.5%.

4. The continuous dynamically heat-crosslinked polyolefin elastic fiber according to claim 3, characterized in that: The percentage of the auxiliary cross-linking agent in the total components is 0.1%-0.5%.

5. A method for producing the continuous dynamically heat-crosslinked polyolefin elastic fiber according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: mixing polyolefin, elastomer, crosslinking agent and auxiliary crosslinking agent in proportion through a high-speed mixing process to obtain a mixed material; S2: The mixed material obtained in S1 is subjected to a twin-screw mixing and granulation process to obtain particles; S3: vacuum drying the particles obtained in S2 to obtain dehydrated particles; S4: the dehydrated particles obtained in S3 are subjected to a single screw spinning process to obtain primary fibers; S5: The spun fibers obtained in S4 are subjected to secondary drawing to obtain finished fibers; S6: Roll up the finished fiber product obtained in S5.

6. The method for producing continuous dynamically heat-crosslinked polyolefin elastic fibers according to claim 5, characterized in that: The mixing speed in step S1 is 900-1500 rpm and the mixing time is 1-5 minutes.

7. The method for producing continuous dynamically heat-crosslinked polyolefin elastic fibers according to claim 5, characterized in that: During the granulation process of step S2, the granulation temperature is 120° C.-240° C., the screw speed is 75-300 rpm, and the melting time is 3-15 minutes.

8. The method for producing continuous dynamically heat-crosslinked polyolefin elastic fibers according to claim 5, characterized in that: The vacuum drying time in step S3 is 24-72 hours; the moisture content of the obtained dehydrated particles is less than 50 ppm.

9. The method for producing continuous dynamically heat-crosslinked polyolefin elastic fibers according to claim 5, characterized in that: In the single screw spinning process in step S4, the spinning temperature is 120-240° C.; the spinning melt pressure is 5-35 MPa; and the spinning speed is 10-50 m / min.

10. The method for producing continuous dynamically heat-crosslinked polyolefin elastic fibers according to claim 5, characterized in that: In step S5, the spun fiber is subjected to a continuous secondary drawing process at 120° C.-185° C.; the total drawing rate of the obtained fiber product is 200%-500%.

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