A method for preparing a strong and tough composite multi-layer fabric based on soybean fiber

Abstract

The invention discloses a method for preparing a strong and tough composite multi-layer fabric based on soybean fiber, comprising the following steps: S1, preparing a strong and tough layer: evenly applying a toughening agent on pretreated soybean fiber, then soaking the pre-treated soybean fiber in an alkanolamide solution, taking it out, melt-blending it with the strong and tough fiber, and then extruding it after cooling to obtain the strong and tough layer; S2, preparing a composite multi-layer fabric: using a fabric containing soybean fiber as a base layer, using a waterproof and breathable fabric as a third layer, and using the strong and tough layer prepared in S2 as a second layer; firstly performing a decontamination treatment on the three-layer fabric, then bonding the base fabric to the strong and tough layer through a hot pressing composite process, bonding the waterproof and breathable fabric to the strong and tough layer through a polyvinyl acetate adhesive after superheated steam shaping, and then performing secondary shaping to obtain the composite multi-layer fabric; the preparation method of the invention has a simple process and enhances the toughness of the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of textile manufacturing, and in particular to a method for preparing a strong and tough composite multi-layer fabric based on soybean fiber. Background Art

[0002] Soy protein fiber belongs to the category of regenerated plant protein fiber. It uses edible soybean protein powder as raw material. It uses bioengineering technology to extract globulin from the protein powder. It is then grafted, copolymerized, and blended with nitrile, hydroxyl and other polymers by adding functional additives to make a protein spinning solution of a certain concentration. The protein spatial structure is changed and the fiber is wet-spun. It has a soft feel like cashmere, a soft luster like silk, and excellent properties such as warmth retention and good skin affinity that are better than cotton.

[0003] However, in addition to the softness and skin-friendly characteristics of fabrics, more people pay attention to the practicality of fabrics, to prevent the fabrics from being easily pulled by external forces and torn during use, lacking toughness and not lasting long. Therefore, it is necessary to further improve the toughness of fabrics. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for preparing a strong and tough composite multi-layer fabric based on soybean fiber.

[0005] The technical solution of the present invention is: a method for preparing a strong composite multi-layer fabric based on soybean fiber, comprising the following steps:

[0006] S1. Preparation of strong layer fabric:

[0007] The toughening agent is evenly applied on the pretreated soybean fiber with a coating thickness of 0.5 to 1 mm, and then soaked in an alkanolamide solution with a mass concentration of 35 to 40% for 1 to 3 hours, taken out, and melt-blended with the strong and tough fiber at a temperature of 170 to 180° C. for 10 to 15 minutes; after cooling to room temperature, the upper and lower surfaces of the cooled blank are respectively squeezed back and forth for 5 to 10 minutes with an upper roller and a lower roller, the extrusion pressure of the upper roller and the lower roller are both 12 to 16N, and the rotation speed is 0.1 to 0.3 m / s, to obtain a strong and tough layer fabric;

[0008] S2. Preparation of composite multi-layer fabrics:

[0009] The fabric containing soybean fiber is used as the base fabric, the strong layer made of S1 is used as the second layer fabric, and the waterproof and breathable fabric is used as the third layer fabric;

[0010] The three-layer fabric is first decontaminated, the base fabric is bonded to the strong layer fabric through a hot pressing composite process, and then subjected to superheated steam shaping; the waterproof and breathable fabric is bonded to the strong layer fabric through a polyvinyl acetate adhesive, and then subjected to secondary shaping to obtain a composite multi-layer fabric.

[0011] Furthermore, in step S1, the pretreatment method is: at room temperature, the soybean fiber is immersed in a silver ion antibacterial agent for 5 to 8 seconds, and after drying, it is baked at 135 to 145° C. for 100 to 110 minutes; the immersion pressure is 0.3 to 0.5 MPa.

[0012] Description: Silver ion antibacterial agent has the advantages of safety, broad spectrum, long-term effect, no resistant bacteria, and significant antibacterial effect; dipping in antibacterial agent can make the fabric have antibacterial and impurity-removing effects, and has little damage to the fiber. The treated fabric is of high quality and soft to the touch; too high or too low curing temperature will cause the fabric to turn yellow.

[0013] Furthermore, in step S2, the preparation method of the base fabric is: take 1 / 3 to 1 / 5 of the mass of the pretreated soybean fiber and blend it with natural fiber as the weft, and blend nylon and silk as the warp for weaving, the weight ratio of soybean fiber, natural fiber, nylon and silk is 1 to 2:1:1 to 2:1, the density of the weft is 56 to 60 strands / cm, and the density of the warp is 80 to 82 strands / cm, to obtain the base fabric.

[0014] Description: After pretreatment, soybean fiber has the characteristics of antibacterial and softness. Nylon has good toughness, is strong and wear-resistant, and is light in weight. Silk fiber has strong recovery and is breathable and moisture-permeable. The above density can make the fabric density higher, so the performance of the base fabric is more excellent.

[0015] Furthermore, the natural fiber is one or more of apocynum fiber, ramie fiber or flax fiber in any weight ratio.

[0016] Description: Linen has good toughness, strong wear resistance, and is breathable and cool, which can improve the toughness of the base fabric.

[0017] Furthermore, in step S2, the waterproof and breathable fabric is a double-layer fabric made of a composite of PTFE membrane and polyester fiber.

[0018] Description: PTFE membrane has high strength and tensile strength, and good self-cleaning properties; polyester fiber has high modulus, high strength, high elasticity, good shape retention and heat resistance; the waterproof and breathable fabric made of the above materials has the advantages of waterproof and breathable, high strength and high elasticity.

[0019] Furthermore, the parameters of the hot pressing composite process are: temperature of 115-135°C, pressure of 0.5-1.5 kg / cm2 , the time is 25 to 30 seconds.

[0020] Note: Hot pressing lamination can glue and bond two layers of materials at the same time to make the composite fastness better; through experiments, it is found that the above process parameters can make the composite fastness between fabrics reach the most stable state.

[0021] Furthermore, the toughening agent is a mixed toughening agent of polybutadiene rubber and high phenyl silicone rubber in a mass ratio of 4 to 5:1.

[0022] Description: Polybutadiene rubber has the advantages of good elasticity, strong wear resistance, good low temperature resistance, small hysteresis loss, etc. High phenyl silicone rubber has small deformation after compression and a wide operating temperature range. It can further improve the elasticity and toughness of polybutadiene rubber, thereby further playing the role of toughening agent.

[0023] Furthermore, the strong fiber is ultra-high molecular weight polyethylene fiber.

[0024] Description: Ultra-high molecular weight polyethylene fiber has high axial tensile strength and modulus, and its energy absorption and damping properties are superior to aramid, and it also makes up for the weakness of high-performance carbon fiber, silicon carbide fiber and other low fracture strain.

[0025] Furthermore, in step S2, the decontamination treatment is carried out by continuously spraying a fluorocarbon resin finishing agent on the tough layer fabric at a spraying amount of 15 to 20 mg / cm 2 After spraying, irradiate with UV light for 5 to 10 minutes with a UV power of 15 to 20 W, and then dry at 65 to 75°C.

[0026] Description: Fluorocarbon resin finishing agents have good heat resistance, chemical resistance, low-temperature flexibility, etc. By spraying the finishing agent and adding ultraviolet irradiation, the surface properties of the fabric can be changed, so that the stains on the surface of the fabric can be precipitated from the fabric, and then separated from the fabric by drying.

[0027] The beneficial effects of the present invention are:

[0028] (1) The preparation method of the tough composite multi-layer fabric of the present invention comprises the following steps: toughening the surface of the soybean fiber by adding a toughening agent to the soybean fiber; and immersing the soybean fiber in an alkanolamide solution with a mass concentration of 35 to 40% to improve the toughening effect of the toughening agent on the surface and interior of the soybean fiber; and finally, melt-blending the toughening fiber with the toughening fiber to further enhance the toughness of the fabric; and finally, extruding the soybean fiber, the toughening agent, and the toughening fiber to make them compatible, so that the toughness of the toughening layer is more uniform.

[0029] (2) The preparation method of the tough composite multi-layer fabric of the present invention reduces the composite cost while stabilizing the performance of the fabric through hot pressing composite process and adhesive bonding, and the performance of the fabric can be kept stable by performing superheated steam shaping and secondary shaping during bonding, and the method is simple. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention.

[0031] Example 1

[0032] A method for preparing a strong composite multilayer fabric based on soybean fiber, comprising the following steps:

[0033] S1. Preparation of strong layer fabric:

[0034] The toughening agent was evenly applied on the pretreated soybean fiber with a coating thickness of 0.8 mm, and then soaked in an alkanolamide solution with a mass concentration of 38% for 2 hours and then taken out, and melt-blended with ultra-high molecular weight polyethylene fiber at a temperature of 175°C and a blending time of 13 minutes; after cooling to room temperature, the upper and lower surfaces of the cooled blank were respectively squeezed back and forth for 8 minutes with an upper roller and a lower roller, the extrusion pressure of the upper roller and the lower roller were both 14N, and the rotation speed was 0.2m / s, to obtain a strong and tough layer fabric;

[0035] The toughening agent is a mixed toughening agent of polybutadiene rubber and high phenyl silicone rubber in a mass ratio of 4.5:1;

[0036] The pretreatment method is as follows: at room temperature, the soybean fiber is immersed in the silver ion antibacterial agent for 7 seconds, dried and baked at 140°C for 105 minutes; the padding pressure is 0.4MPa;

[0037] S2. Preparation of composite multi-layer fabrics:

[0038] A fabric containing soybean fiber is used as a base fabric. The preparation method of the base fabric is as follows: 1 / 4 of the mass of the pretreated soybean fiber is blended with apocynum fiber as a weft, and nylon and silk are blended as a warp for weaving, the weight ratio of the soybean fiber, the natural fiber, the nylon, and the silk is 1.5:1:1.5:1, the density of the weft is 58 strands / cm, and the density of the warp is 81 strands / cm, to obtain the base fabric;

[0039] The fabric containing soybean fiber is used as the base fabric, the strong layer fabric made by S1 is used as the second layer fabric, and the waterproof and breathable fabric is used as the third layer fabric; the waterproof and breathable fabric is a double-layer fabric made of PTFE membrane and polyester fiber;

[0040] After the three layers of fabric are decontaminated, the decontamination treatment method is: continuously spraying a fluorocarbon resin finishing agent on the tough layer fabric, the spraying amount is 18 mg / cm2, after the spraying is completed, ultraviolet irradiation is performed for 8 minutes, the ultraviolet power is 18W, and then drying at 70°C;

[0041] After the three layers of fabric are decontaminated, the base layer fabric is bonded to the tough layer fabric through a hot pressing composite process, and then subjected to superheated steam shaping; the waterproof and breathable fabric is bonded to the tough layer fabric through a polyvinyl acetate adhesive, and then subjected to secondary shaping to obtain a composite multi-layer fabric;

[0042] The parameters of the hot pressing composite process are: temperature of 120° C., pressure of 1.0 kg / cm 2 , and time of 28 s; the temperature of the superheated steam setting and the secondary setting is 138° C., and the time is 20 min.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 is that the toughening agent is evenly applied to the pretreated soybean fiber with a coating thickness of 0.5 mm, and then the fiber is taken out after being immersed in an alkanolamide solution with a mass concentration of 35% for 1 hour.

[0045] Example 3

[0046] The difference between this embodiment and embodiment 1 is that the toughening agent is evenly applied to the pretreated soybean fiber with a coating thickness of 1 mm, and then the fiber is taken out after being immersed in an alkanolamide solution with a mass concentration of 40% for 3 hours.

[0047] Example 4

[0048] The difference between this embodiment and embodiment 1 is that the melt blending temperature is 170° C. and the blending time is 10 min.

[0049] Example 5

[0050] The difference between this embodiment and embodiment 1 is that the melt blending temperature is 180° C. and the blending time is 15 min.

[0051] Example 6

[0052] The difference between this embodiment and embodiment 1 is that the extrusion time is 5 minutes, the extrusion pressure of the upper roller and the lower roller are both 12N, and the rotation speed is 0.1m / s.

[0053] Example 7

[0054] The difference between this embodiment and embodiment 1 is that the extrusion time is 10 minutes, the extrusion pressure of the upper roller and the lower roller are both 16N, and the rotation speed is 0.3m / s.

[0055] Example 8

[0056] The difference between this embodiment and Embodiment 1 is that the weight ratio of soybean fiber, natural fiber, nylon and silk is 1:1:1:1.

[0057] Example 9

[0058] The difference between this embodiment and Embodiment 1 is that the weight ratio of soybean fiber, natural fiber, nylon and silk is 2:1:2:1.

[0059] Example 10

[0060] The difference between this embodiment and the first embodiment is that the density of the weft is 56 threads / cm, and the density of the warp is 80 threads / cm.

[0061] Embodiment 11

[0062] The difference between this embodiment and the first embodiment is that the density of the weft is 60 threads / cm, and the density of the warp is 82 threads / cm.

[0063] Example 12

[0064] The difference between this embodiment and embodiment 1 is that the parameters of the hot pressing composite process are: temperature 115°C, pressure 0.5kg / cm 2 , time is 25s.

[0065] Example 13

[0066] The difference between this embodiment and embodiment 1 is that the parameters of the hot pressing composite process are: temperature 135°C, pressure 1.5 kg / cm 2 , time is 30s.

[0067] Embodiment 14

[0068] The difference between this embodiment and embodiment 1 is that the pretreatment method is: immersing the soybean fiber in the silver ion antibacterial agent at room temperature for 5 seconds, and the immersion pressure is 0.3 MPa.

[0069] Embodiment 15

[0070] The difference between this embodiment and embodiment 1 is that the pretreatment method is: immersing the soybean fiber in the silver ion antibacterial agent at room temperature for 8 seconds, and the immersion pressure is 0.5 MPa.

[0071] Example 16

[0072] The difference between this embodiment and embodiment 1 is that the curing temperature is 135° C. and the curing time is 100 min.

[0073] Embodiment 17

[0074] The difference between this embodiment and embodiment 1 is that the curing temperature is 145° C. and the curing time is 110 min.

[0075] Embodiment 18

[0076] The difference between this embodiment and embodiment 1 is that the toughening agent is a mixed toughening agent of polybutadiene rubber and high phenyl silicone rubber in a mass ratio of 4:1.

[0077] Embodiment 19

[0078] The difference between this embodiment and embodiment 1 is that the toughening agent is a mixed toughening agent of polybutadiene rubber and high phenyl silicone rubber in a mass ratio of 5:1.

[0079] Embodiment 20

[0080] The difference between this embodiment and embodiment 1 is that the spraying amount of the fluorocarbon resin finishing agent is 15 mg / cm 2 .

[0081] Embodiment 21

[0082] The difference between this embodiment and embodiment 1 is that the spraying amount of the fluorocarbon resin finishing agent is 20 mg / cm 2 .

[0083] Embodiment 22

[0084] The difference between this embodiment and embodiment 1 is that after spraying, ultraviolet irradiation is performed for 5 minutes, and the ultraviolet power is 15W.

[0085] Embodiment 23

[0086] The difference between this embodiment and embodiment 1 is that after spraying, the ultraviolet irradiation is performed for 10 minutes, and the ultraviolet power is 20W.

[0087] Embodiment 24

[0088] The difference between this embodiment and embodiment 1 is that the temperature of the superheated steam shaping and the secondary shaping is 135° C. and the time is 15 minutes.

[0089] Embodiment 25

[0090] The difference between this embodiment and embodiment 1 is that the temperature of the superheated steam shaping and the secondary shaping is 140° C. and the time is 25 minutes.

[0091] Experimental example

[0092] For the composite multi-layer fabric prepared in each embodiment, 5 samples of each embodiment were taken to test the elongation at break of the composite multi-layer fabric. The elongation at break results of the 5 samples of each embodiment were averaged as the elongation at break result of the embodiment. The specific exploration is as follows:

[0093] 1. Investigate the influence of the parameters of each step in the preparation method on the tensile elongation at break of composite multi-layer fabrics.

[0094] Examples 1-25 and control examples 1-5 were used for experimental comparison, and the results are shown in Table 1:

[0095] Table 1 Effect of Examples and Control Examples on Elongation at Break of Composite Multilayer Fabrics (%)

[0096]

[0097]

[0098] The difference between Control Example 1 and Example 1 is that the soybean fiber is directly melt-blended with the ultra-high molecular weight polyethylene fiber after being coated with the toughening agent;

[0099] The difference between Control Example 2 and Example 1 is that no decontamination treatment is performed before preparing the composite multi-layer fabric;

[0100] The difference between Control Example 3 and Example 1 is that the soybean fiber is not melt-blended with the ultra-high molecular weight polyethylene fiber after soaking, but is directly cooled and extruded to form a strong and tough layer;

[0101] The difference between Control Example 4 and Example 1 is that the toughening agent is polybutadiene rubber;

[0102] The difference between Control Example 5 and Example 1 is that no ultraviolet irradiation is performed during the decontamination treatment;

[0103] From the results in Table 1, it can be seen that Control Example 1 lacks immersion in alkanolamide solution, Control Example 2 lacks decontamination treatment, Control Example 3 lacks mixing of strong and tough fibers, Control Example 4 lacks the auxiliary effect of high phenyl silicone rubber, and Control Example 5 lacks ultraviolet effect. Its elongation at break is less than that of Examples 1-25. Therefore, these steps or substances have a certain promoting or improving effect on the improvement of toughness.

[0104] From the comparison of the embodiments, it can be seen that the elongation at break of embodiments 1, 5, 11, 17, and 25 is relatively large, and the toughness is good, but compared with embodiment 1, embodiment 5 requires a higher temperature and a longer time for melt blending, embodiment 11 requires a higher density, that is, the number of threads is greater, embodiment 17 requires a higher baking temperature and a longer time, and embodiment 25 requires a higher shaping temperature and a longer time, but the increase in the elongation at break compared to embodiment 1 is smaller. Therefore, from the perspective of economy, the parameters of embodiment 1 are relatively better.

Claims

1. A method for preparing a strong composite multi-layer fabric based on soybean fiber, characterized in that: The following steps are involved: S1. Preparation of strong layer fabric: The toughening agent is evenly applied on the pretreated soybean fiber, wherein the toughening agent is a mixed toughening agent of polybutadiene rubber and high phenyl silicone rubber in a mass ratio of 4 to 5:1, and the coating thickness is 0.5 to 1 mm. Then, the fiber is soaked in an alkanolamide solution with a mass concentration of 35 to 40% for 1 to 3 hours, taken out, and melt-blended with the strong and tough fiber, wherein the strong and tough fiber is an ultra-high molecular weight polyethylene fiber, the temperature is 170 to 180°C, and the blending time is 10 to 15 minutes. After cooling to room temperature, the upper and lower surfaces of the cooled blank are respectively squeezed back and forth for 5 to 10 minutes with an upper roller and a lower roller, the extrusion pressure of the upper roller and the lower roller are both 12 to 16N, and the rotation speed is 0.1 to 0.3 m / s, to obtain a strong and tough layer fabric. S2. Preparation of composite multi-layer fabrics: The fabric containing soybean fiber is used as the base fabric, the strong layer made of S1 is used as the second layer fabric, and the waterproof and breathable fabric is used as the third layer fabric; After the three layers of fabric are decontaminated, the base layer fabric is bonded to the tough layer fabric through a hot pressing composite process, and then subjected to superheated steam shaping; the waterproof and breathable fabric is bonded to the tough layer fabric through a polyvinyl acetate adhesive, and then subjected to secondary shaping to obtain a composite multi-layer fabric; The decontamination treatment method is: continuously spraying fluorocarbon resin finishing agent on the tough layer fabric, with a spraying amount of 15-20 mg / cm 2 After spraying, irradiate with UV light for 5 to 10 minutes with a UV power of 15 to 20 W, and then dry at 65 to 75°C.

2. The method for preparing a strong composite multi-layer fabric based on soybean fiber according to claim 1, characterized in that: In step S1, the pretreatment method is: at room temperature, the soybean fiber is immersed in a silver ion antibacterial agent for 5 to 8 seconds, and then baked at 135 to 145° C. for 100 to 110 minutes after drying; the immersion pressure is 0.3 to 0.5 MPa.

3. The method for preparing a strong and tough composite multi-layer fabric based on soybean fiber according to claim 2, characterized in that: In step S2, the preparation method of the base fabric is: take 1 / 3 to 1 / 5 of the mass of the pretreated soybean fiber and blend it with natural fiber as the weft, and blend nylon and silk as the warp for weaving, the weight ratio of soybean fiber, natural fiber, nylon and silk is 1 to 2:1:1 to 2:1, the density of the weft is 56 to 60 strands / cm, and the density of the warp is 80 to 82 strands / cm, to obtain the base fabric.

4. The method for preparing a strong and tough composite multi-layer fabric based on soybean fiber according to claim 3, characterized in that: The natural fiber is one or more of apocynum fiber, ramie fiber or flax fiber in any weight ratio.

5. The method for preparing a strong and tough composite multi-layer fabric based on soybean fiber according to claim 1, characterized in that: In step S2, the waterproof and breathable fabric is a double-layer fabric made of a composite of PTFE membrane and polyester fiber.

6. The method for preparing a strong and tough composite multi-layer fabric based on soybean fiber according to claim 1, characterized in that: In step S2, the parameters of the hot pressing composite process are: temperature of 115-135°C, pressure of 0.5-1.5 kg / cm 2 , the time is 25 to 30 seconds.

7. The method for preparing a strong and tough composite multi-layer fabric based on soybean fiber according to claim 1, characterized in that: In step S2, the temperature of the superheated steam shaping and the secondary shaping is 135-140°C, and the time is 15-25 minutes.

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