High-performance chinlon and woven bag product thereof

Abstract

The invention belongs to the field of chinlon and chinlon products, and particularly relates to high-performance chinlon and a woven bag product thereof. Chinlon slices serve as a main body, dispersion bodies of aluminum sol and carbon aerogel are added, a screw extruder is adopted for melting to obtain spinning melt, the spinning melt is fed into a spinning manifold for spinning, and first fibers are obtained; carrying out drafting and high-temperature heat setting on the first fiber to obtain a second fiber; performing sulfydryl functionalization modification on the second fiber to obtain the high-performance chinlon, the breaking strength is high, even after long-term high-temperature and high-pressure cooking, the reduction amplitude of the breaking strength is small, and no obvious performance degradation phenomenon occurs.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon and its products, and specifically relates to high-performance nylon and its woven bag products. Background Art

[0002] Nylon, also known as nylon, is a chemical synthetic fiber. Its scientific name is polyamide fiber (PA). Its molecular main chain contains repeated amide groups (-NHCO-).

[0003] Nylon woven bags are a widely used packaging material in many fields with various advantages and uses. The main features of nylon woven bags include durability, water resistance and lightness. These characteristics make them widely used in many industries such as logistics, moving, agriculture, chemicals, etc.

[0004] At present, nylon woven bags are generally customized through lamination, thickening and other methods to meet the needs of specific fields, such as the specialty chemical field.

[0005] At present, nylon woven bags are used in the field of special chemical production, such as packaging solid catalysts for synthesis reactions. Due to long-term high-temperature and high-pressure cooking, the strength of the nylon fiber itself decreases to a certain extent, resulting in obvious performance degradation.

[0006] Based on this, the present invention is proposed. Summary of the invention

[0007] The object of the present invention is to provide a high-performance nylon and a woven bag product thereof to solve the above-mentioned problems.

[0008] On the one hand, a high-performance nylon is mainly composed of nylon chips, which are added with a dispersion of aluminum sol and carbon aerogel, and melted by a screw extruder to obtain a spinning melt, and the spinning melt is sent to a spinning box for spinning to obtain a first fiber; the first fiber is stretched and heat-set at high temperature to obtain a second fiber; the second fiber is modified by mercapto functionalization to obtain the high-performance nylon.

[0009] As a further improvement, the nylon slices are crushed to pass through an 80-mesh sieve to obtain nylon powder, which is then mixed and stirred evenly with a dispersion of aluminum sol and carbon aerogel, and then dried and fed into a screw extruder for melting.

[0010] As a further improvement, the method for preparing the dispersion of aluminum sol and carbon aerogel comprises the following steps:

[0011] Add 2 to 2.6 parts by mass of carbon aerogel to 10 parts by mass of aluminum sol, stir with a stirring paddle, first stir at 0 to 1°C for 15 to 25 minutes, then heat to 100°C at a rate of 5°C / min while stirring, keep stirring for another 5 to 10 minutes to obtain a dispersion of the aluminum sol and carbon aerogel.

[0012] In the preparation process of the dispersion of aluminum sol and carbon aerogel, since the aluminum sol is very light, it must be stirred with a stirring paddle. The carbon aerogel is first pressed into the aluminum sol by the mechanical stirring force of the stirring paddle, and finally crushed and evenly dispersed by the mechanical stirring force.

[0013] As a further improvement, the mass ratio between the nylon powder and the dispersion of aluminum sol and carbon aerogel is 100:(3.3-3.8).

[0014] For further improvement, the drying temperature is 100°C and the drying time is 3 to 5 hours.

[0015] As a further improvement, the second fiber is immersed in an organic solvent, ethylenedithiol is added, and ultrasonic reaction is performed for 12 to 24 hours. After the reaction is completed, the fiber is filtered, washed, and dried to complete the thiol functionalization modification.

[0016] Ultrasonic reaction must be used. If stirring is used, a large number of broken wires will appear.

[0017] As a further improvement, the mass ratio of the second fiber to ethylenedithiol is 1:1.3.

[0018] In a further improvement, the organic solvent is one or more of ethanol, acetone, and toluene.

[0019] As a further improvement, the mass ratio of the second fiber to the organic solvent is 1:(30-50).

[0020] On the other hand, a woven bag product is woven by using the high-performance nylon mentioned above.

[0021] On the other hand, the obtained high-performance nylon can also be used as a catalyst to catalyze the hydroxylation reaction of phenol.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The high-performance nylon of the present invention has high breaking strength. Even after long-term high-temperature and high-pressure cooking, the decrease in breaking strength is small (100°C, 2 atmospheres, 60r / min stirring, cooking for 240h, the decrease does not exceed 11%), and no obvious performance degradation occurs.

[0024] 2. The high-performance nylon of the present invention can also be used as a catalyst to catalyze the hydroxylation reaction of phenol. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a 24,000-fold picture of the high-performance nylon fiber in Example 1, and the thiol-functionalized particles on its surface are shown at the arrows. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0027] Example 1

[0028] 1. Add 2 kg of carbon aerogel to 10 kg of aluminum sol (the Al2O3 content in the aluminum sol is 25±0.5%), stir with a stirring paddle, first stir at 0-1°C for 15 min, then heat to 100°C at a rate of 5°C / min while stirring, keep stirring for another 5 min to obtain a dispersion of aluminum sol and carbon aerogel.

[0029] 2. The nylon slices were crushed to pass through an 80-mesh sieve to obtain nylon powder. 10 kg of nylon powder was taken and mixed with 0.33 kg of aluminum sol and carbon aerogel dispersion, stirred evenly, dried (drying temperature was 100 ° C, drying time was 3 h), and then sent to a screw extruder for melting to obtain a spinning melt, and the spinning melt was sent to a spinning box for spinning to obtain a first fiber; the first fiber was stretched and heat-set at high temperature to obtain a second fiber.

[0030] 3. Soak 5 kg of the second fiber in 150 kg of toluene, add 6.5 kg of ethanedithiol, and react with ultrasound for 12 hours. After the reaction is completed, filter, wash twice with toluene, and dry. The thiol functionalization modification is completed to obtain the high-performance nylon.

[0031] See Figure 1 , the nylon fiber surface is loaded with mercapto-functionalized particles, as shown by the arrows.

[0032] Example 2

[0033] 1. Add 2.6 kg of carbon aerogel to 10 kg of aluminum sol (the Al2O3 content in the aluminum sol is 25±0.5%), stir with a stirring paddle, first stir at 0-1°C for 25 min, then heat to 100°C at a rate of 5°C / min while stirring, keep stirring for another 10 min to obtain a dispersion of aluminum sol and carbon aerogel.

[0034] 2. The nylon slices were crushed to pass through an 80-mesh sieve to obtain nylon powder. 10 kg of nylon powder was taken and mixed with 0.38 kg of aluminum sol and carbon aerogel dispersion, stirred evenly, dried (drying temperature was 100 ° C, drying time was 5 h), and then sent to a screw extruder for melting to obtain a spinning melt, and the spinning melt was sent to a spinning box for spinning to obtain a first fiber; the first fiber was stretched and heat-set at high temperature to obtain a second fiber.

[0035] 3. Soak 5 kg of the second fiber in 250 kg of toluene, add 6.5 kg of ethanedithiol, and react with ultrasound for 24 hours. After the reaction is completed, filter, wash with toluene three times, and dry. The thiol functionalization modification is completed to obtain the high-performance nylon.

[0036] Example 3

[0037] In this example, the difference from Example 1 is that no dispersion of aluminum sol and carbon aerogel is added, and the nylon chips are directly fed into a screw extruder for melting to obtain a spinning melt, and the rest are the same.

[0038] Example 4

[0039] In this example, the difference from Example 1 is that the dispersion of aluminum sol and carbon aerogel is not added, and the dispersion of aluminum sol and carbon aerogel is replaced by the control dispersion 1, and the rest are the same.

[0040] The preparation method of control dispersion 1 is as follows:

[0041] 2 kg of carbon aerogel was added to 10 kg of aluminum sol (the Al2O3 content in the aluminum sol was 25±0.5%), and stirred at room temperature for 50 min using a stirring paddle to obtain a control dispersion 1.

[0042] Example 5

[0043] In this example, the difference from Example 1 is that the dispersion of aluminum sol and carbon aerogel is not added, and the dispersion of aluminum sol and carbon aerogel is replaced by the control dispersion 2, and the rest are the same.

[0044] The preparation method of control dispersion 2 is as follows:

[0045] 2 kg of carbon aerogel was added to 10 kg of aluminum sol (the Al2O3 content in the aluminum sol was 25±0.5%), and stirred at 100°C for 50 min using a stirring paddle to obtain a control dispersion 2.

[0046] Example 6

[0047] In this example, the difference from Example 1 is that aluminum sol is used to replace the dispersion of aluminum sol and carbon aerogel, and the rest are the same.

[0048] In addition, it was found in the experiment that if only carbon aerogel is added, that is, carbon aerogel is used to replace the dispersion of aluminum sol and carbon aerogel, a large number of broken fibers will appear during spinning, and the fibers will not be spinnable.

[0049] Example 7

[0050] In this example, the difference from Example 1 is that the ethanedithiol used for the thiol functionalization modification is replaced by β-mercaptoethylamine, and the rest is the same.

[0051] The properties of the high performance nylon of Examples 1 to 7 are shown in Table 1:

[0052] Table 1

[0053] Breaking strength (cN / dtex) Breaking strength after long-term high temperature and high pressure cooking (cN / dtex) Example 1 8.22 7.32 Example 2 8.5 7.69 Example 3 9.01 2.95 Example 4 5.56 1.38 Example 5 4.73 1.29 Example 6 4.17 0.95 Example 7 3.38 1.99 Reference fiber 1 5.35 3.51 Reference fiber 2 3.59 1.81

[0054] Reference fiber 1 is an existing nylon fiber, which is obtained by directly melting nylon chips using a screw extruder to obtain a spinning melt, sending the spinning melt into a spinning box for spinning, and then drawing and high-temperature heat setting.

[0055] Reference fiber 2 was taken from the second fiber in Example 1.

[0056] The breaking strength after long-term high-temperature and high-pressure cooking is measured by cooking at 100°C and 2 atmospheres of pressure. During the cooking process, a stirring paddle is used to pull the fibers. The stirring speed is 60r / min. The cooking is performed for 240 hours. After the cooking is completed, the breaking strength of the fibers is measured.

[0057] From the above, it can be seen that the breaking strength of nylon fiber will be greatly reduced due to the doping of aluminum sol and carbon aerogel dispersion into the nylon substrate, while the breaking strength of the fiber will be significantly improved by modifying the surface of nylon fiber with mercapto functionalization.

[0058] When adding aluminum sol and carbon aerogel, the carbon aerogel must first be dispersed at low temperature, and then gradually heated to make the dispersion more orderly, and finally produce a dispersion of aluminum sol and carbon aerogel with high stability.

[0059] Characterization test of catalytic activity of phenol hydroxylation

[0060] 50g of phenol, 100g of 36% hydrogen peroxide and 7g of high-performance nylon (Examples 1, 3, 4, 5, 6, 7 and reference fibers 1 and 2) were refluxed at 70°C for 2h to investigate the effects of different types of high-performance nylon on the products of the phenol hydroxylation reaction. The results are shown in Table 2:

[0061] Table 2

[0062]

[0063] In Table 2, the blank group refers to the reaction group of phenol and hydrogen peroxide without adding a catalyst.

[0064] As can be seen from Table 2, by adding the dispersion of aluminum sol and carbon aerogel internally and modifying the nylon fiber externally with mercapto functionalization, the high-performance nylon obtained can also be used to catalyze the hydroxylation reaction of phenol.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-performance nylon, characterized in that: Nylon chips are used as the main body, aluminum sol and carbon aerogel dispersion are added, a screw extruder is used to melt to obtain a spinning melt, and the spinning melt is sent to a spinning box for spinning to obtain a first fiber; the first fiber is stretched and heat-set at high temperature to obtain a second fiber; the second fiber is modified by mercapto functionalization to obtain the high-performance nylon.

2. The high-performance nylon according to claim 1, characterized in that: The nylon slices are crushed to pass through an 80-mesh sieve to obtain nylon powder, which is then mixed and stirred evenly with the dispersion of aluminum sol and carbon aerogel, and then dried and sent to a screw extruder for melting.

3. The high-performance nylon according to claim 1, characterized in that: The method for preparing the dispersion of aluminum sol and carbon aerogel comprises the following steps: Add 2 to 2.6 parts by mass of carbon aerogel to 10 parts by mass of aluminum sol, stir with a stirring paddle, first stir at 0 to 1°C for 15 to 25 minutes, then heat to 100°C at a rate of 5°C / min while stirring, keep stirring for another 5 to 10 minutes to obtain a dispersion of the aluminum sol and carbon aerogel.

4. The high performance nylon according to claim 2, characterized in that: The mass ratio of the nylon powder to the dispersion of aluminum sol and carbon aerogel is 100:(3.3-3.8).

5. The high performance nylon according to claim 2, characterized in that: The drying temperature is 100°C and the drying time is 3 to 5 hours.

6. The high performance nylon according to claim 1, characterized in that: The second fiber is immersed in an organic solvent, ethylenedithiol is added, and ultrasonic reaction is performed for 12 to 24 hours. After the reaction is completed, the fiber is filtered, washed, and dried, and the thiol functionalization modification is completed.

7. The high performance nylon according to claim 6, characterized in that: The mass ratio of the second fiber to ethanedithiol is 1:1.

3.

8. The high-performance nylon according to claim 6, characterized in that: The organic solvent is one or more of ethanol, acetone and toluene.

9. The high-performance nylon according to claim 8, characterized in that: The mass ratio of the second fiber to the organic solvent is 1:(30-50).

10. A woven bag product, characterized in that: The high-performance nylon is woven by weaving according to any one of claims 1 to 9.

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