TPU fiber papermaking felt and preparation method thereof
By using TPU fiber layer and modified montmorillonite in papermaking blankets and adding TPU fiber layer between the surface and bottom fiber layers, the problem of insufficient mechanical performance in papermaking blankets during high-speed papermaking is solved, significantly improving its mechanical properties and wear resistance and extending its service life.
Patent Information
- Application Number
- CN202510647688.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-06-20
AI Technical Summary
The existing papermaking blankets lack mechanical properties during high-speed papermaking, which leads to the inability to maintain stability for a long time during high-speed papermaking, and there are problems of friction loss.
A TPU fiber layer is used, and a TPU fiber layer is added between the surface fiber layer and the bottom fiber layer, and a modified montmorillonite is added to the TPU fiber layer, and a paper-making blanket is prepared by heat treatment and curing steps.
It significantly improves the mechanical properties and wear resistance of paper-making blankets, so that they can maintain stability for a long time during high-speed paper making, reduce losses caused by friction, and extend the service life of paper-making blankets.
Smart Images
Figure CN120174655A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a papermaking felt, and more particularly to a TPU fiber papermaking felt and a preparation method thereof. Background Art
[0002] Papermaking felt is an extremely important auxiliary material in papermaking production, mainly used in the forming section, pressing section and drying section of a paper machine. It is composed of multiple layers of fiber fabrics and has good water absorption, air permeability and elastic recovery performance. During the papermaking process, the papermaking felt is responsible for transporting the paper stock, ensuring the uniform distribution of pulp fibers on the paper machine, and at the same time helping to remove excess water during the pressing process to improve the dryness of the paper. It can also buffer mechanical shocks, reduce paper deformation, and maintain the flatness and dimensional stability of the paper. In addition, the cleaning function of the papermaking felt can remove impurities in the paper stock and improve the appearance quality of the paper. Its performance directly affects the quality and production efficiency of the paper and is an indispensable key component in modern papermaking industry.
[0003] The application of TPU (polyurethane) in papermaking felt can significantly improve the performance and service life of the felt, while reducing energy consumption and maintenance costs during the production process, but there is little research on its compounding with nanomaterials. Summary of the Invention
[0004] To solve the problems existing in the prior art, the present invention provides a TPU fiber papermaking felt and a preparation method thereof.
[0005] The present invention is achieved by the following technical solutions:
[0006] A TPU fiber papermaking felt includes a surface fiber layer and a bottom fiber layer, and a TPU fiber layer is further provided between the surface fiber layer and the bottom fiber layer;
[0007] Wherein the surface fiber layer and the bottom fiber layer are composed of 10% of 6D bicomponent hot-melt polypropylene fiber and 90% of 15D polyamide staple fiber, and the thickness of each is 0.3 mm.
[0008] Further, the preparation method of the TPU fiber layer is as follows:
[0009] First, TPU and modified montmorillonite are vacuumed at 70 °C for 12 h; then, 95 parts of TPU, 5 parts of modified montmorillonite, and 0.1 part of 619F antioxidant are blended by weight and then added to a rheometer for mixing and kneading, and then spun. The spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain TPU fibers with a length of 15 mm and a fineness of 50 D. After weaving, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0010] Further, the spinning conditions are a spinning temperature of 280 °C, a room temperature of 30 °C, a relative humidity of 65%, and a spinning speed of 1500 m / s.
[0011] Further, the length of the TPU fiber is 15 mm and the fineness is 50 D.
[0012] Further, the thickness of the TPU fiber layer is 0.3 mm.
[0013] Further, the preparation method of the modified montmorillonite is as follows:
[0014] Step S1: Acid-treat the montmorillonite;
[0015] Step S2: Take 5 g of acid-treated montmorillonite and disperse it in 100 mL of deionized water to obtain a montmorillonite solution; take 1.5 g of ammonium chloride and disperse it in 20 mL of 50% (V / V) ethanol water, heat it at 50 °C for 20 min to obtain an ammonium chloride solution; slowly add the ammonium chloride solution to the montmorillonite solution, then heat it at 80 °C for 8 h, then centrifuge it at 8000 rpm, wash the precipitate with 50% (V / V) ethanol water 3 times, then dry it at 105 °C for 24 h, and then grind it through a 300-mesh sieve to obtain the modified montmorillonite.
[0016] Further, the ammonium chloride is selected from one of dodecyltrimethylammonium chloride, cetyltriethylammonium chloride, and dimethyldioctadecylammonium chloride.
[0017] Further, the ammonium chloride is selected from dodecyltrimethylammonium chloride.
[0018] Further, the method for acid-treating the montmorillonite is as follows: Disperse 10 g of montmorillonite in 100 mL of 1 M methanesulfonic acid aqueous solution, reflux it at 110 °C for 2 h, then naturally cool it to room temperature, centrifuge to obtain a precipitate, wash the precipitate with deionized water 3 times, and then dry it at 120 °C to obtain the acid-treated montmorillonite.
[0019] The present invention also provides a preparation method of a TPU fiber papermaking felt, which is characterized by including the following steps: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat it at 85 °C for 2 hours, and then cure it at 140 °C for 30 minutes; at 25 °C, soak it in deionized water for 1 hour, and then heat-treat it at 120 °C for 20 minutes.
[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0021] Adding modified montmorillonite to the TPU fiber layer significantly improves the mechanical properties of the papermaking felt, enabling it to maintain stability for a long time during high-speed papermaking and reducing losses caused by friction. By adding a TPU fiber layer between the surface fiber layer and the bottom fiber layer, the overall strength and wear resistance of the felt are enhanced, thereby extending the service life of the papermaking felt. Description of the Drawings
[0022] Figure 1 This is the SEM image of the modified montmorillonite in Example 1 of the present invention. Detailed Implementation Modes
[0023] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in combination with examples and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.
[0024] In the present invention, TPU is thermoplastic polyurethane elastomer resin;
[0025] Montmorillonite: CAS: 1318 - 93 - 0;
[0026] DTAC: Dodecyltrimethylammonium chloride, CAS: 112 - 00 - 5;
[0027] CCTC: Cetyltriethylammonium chloride, CAS: 112 - 02 - 7;
[0028] DODMAC: Dimethyldioctadecylammonium chloride, CAS: 107 - 64 - 2.
[0029] Example 1
[0030] A TPU fiber papermaking felt includes a surface fiber layer and a bottom fiber layer, and a TPU fiber layer is also provided between the surface fiber layer and the bottom fiber layer.
[0031] Among them, the surface fiber layer and the bottom fiber layer are composed of 10% of 6D bicomponent hot-melt polypropylene fiber and 90% of 15D polyamide staple fiber, and the thickness of each is 0.3 mm.
[0032] The preparation method of the TPU fiber papermaking felt: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat at 85 °C for 2 hours, and then cure at 140 °C for 30 minutes; Immerse in deionized water at 25 °C for 1 hour, and then heat-treat at 120 °C for 20 minutes.
[0033] The preparation method of the TPU fiber layer is as follows:
[0034] First, TPU and montmorillonite are vacuumed at 70°C for 12 hours. Then, 95 parts of TPU, 5 parts of modified montmorillonite, and 0.1 part of antioxidant 619F are blended by weight and then kneaded by adding them into a rheometer, followed by spinning. The spinning temperature is 280°C, the room temperature is 30°C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain fibers with a length of 15 mm and a fineness of 50 D. After weaving, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0035] The preparation of the modified montmorillonite includes the following steps:
[0036] Step S1: 10 g of montmorillonite is dispersed into 100 mL of 1 M methanesulfonic acid aqueous solution, refluxed at 110°C for 2 hours, then naturally cooled to room temperature, centrifuged to obtain a precipitate, and the precipitate is washed 3 times with deionized water and then dried at 120°C to obtain acid-treated montmorillonite.
[0037] Step S2: Take 5 g of acid-treated montmorillonite and disperse it into 100 mL of deionized water to obtain a montmorillonite solution; take 1.5 g of DTAC and disperse it into 20 mL of 50% (V / V) ethanol-water, heat it at 50°C for 20 minutes to obtain a DTAC solution; slowly add the DTAC solution to the montmorillonite solution, then heat it at 80°C for 8 hours, then centrifuge it at 8000 rpm, wash the precipitate 3 times with 50% (V / V) ethanol-water, then dry it at 105°C for 24 hours, and then grind it through a 300-mesh sieve to obtain modified montmorillonite. Figure 1 This is the SEM image of the modified montmorillonite in Example 1 of the present invention, and the scale bar is 10 μm.
[0038] Example 2
[0039] A TPU fiber papermaking felt includes a surface fiber layer, a bottom fiber layer, and a TPU fiber layer is also provided between the surface fiber layer and the bottom fiber layer.
[0040] Among them, the surface fiber layer and the bottom fiber layer are composed of 10% of 6D bicomponent hot-melt polypropylene fibers and 90% of 15D polyamide staple fibers, and the thickness of both is 0.3 mm.
[0041] The preparation method of the TPU fiber papermaking felt: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat it at 85°C for 2 hours, and then cure it at 140°C for 30 minutes; at 25°C, soak it in deionized water for 1 hour, and then heat-treat it at 120°C for 20 minutes.
[0042] The preparation method of the TPU fiber layer is as follows:
[0043] First, TPU and montmorillonite are vacuumed at 70 °C for 12 h. Then, 95 parts of TPU, 5 parts of modified montmorillonite, and 0.1 part of antioxidant 619F are blended by weight and added to a rheometer for kneading, followed by spinning. The spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain fibers with a length of 15 mm and a fineness of 50 D. After weaving, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0044] The preparation of the modified montmorillonite includes the following steps:
[0045] Step S1: 10 g of montmorillonite is dispersed in 100 mL of 1 M methanesulfonic acid aqueous solution, refluxed at 110 °C for 2 h, then naturally cooled to room temperature, centrifuged to obtain a precipitate, washed 3 times with deionized water, and then dried at 120 °C to obtain acid-treated montmorillonite.
[0046] Step S2: Take 5 g of acid-treated montmorillonite and disperse it in 100 mL of deionized water to obtain a montmorillonite solution; take 1.5 g of CCTC and disperse it in 20 mL of 50% (V / V) ethanol water, heat it at 50 °C for 20 min to obtain a CCTC solution; slowly add the CCTC solution to the montmorillonite solution, then heat it at 80 °C for 8 h, then centrifuge at 8000 rpm, wash the precipitate 3 times with 50% (V / V) ethanol water, then dry it at 105 °C for 24 h, and then grind it through a 300-mesh sieve to obtain modified montmorillonite.
[0047] Example 3
[0048] A TPU fiber papermaking felt includes a surface fiber layer and a bottom fiber layer, and a TPU fiber layer is also provided between the surface fiber layer and the bottom fiber layer.
[0049] The surface fiber layer and the bottom fiber layer are composed of 10% 6D bicomponent hot-melt polypropylene fiber and 90% 15D polyamide staple fiber, and the thickness of both is 0.3 mm.
[0050] The preparation method of the TPU fiber papermaking felt: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat it at 85 °C for 2 h, and then cure it at 140 °C for 30 min; soak it in deionized water at 25 °C for 1 h, and then heat-treat it at 120 °C for 20 min.
[0051] The preparation method of the TPU fiber layer is as follows:
[0052] First, TPU and montmorillonite are vacuumed at 70 °C for 12 h. Then, 95 parts of TPU, 5 parts of modified montmorillonite, and 0.1 part of antioxidant 619F are blended by weight and added to a rheometer for kneading, followed by spinning. The spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain fibers with a length of 15 mm and a fineness of 50 D. After textile, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0053] The preparation of the modified montmorillonite includes the following steps:
[0054] Step S1: 10 g of montmorillonite is dispersed in 100 mL of 1 M methanesulfonic acid aqueous solution, refluxed at 110 °C for 2 h, then naturally cooled to room temperature, centrifuged to obtain a precipitate, washed with deionized water three times, and then dried at 120 °C to obtain acid-treated montmorillonite.
[0055] Step S2: Take 5 g of acid-treated montmorillonite and disperse it in 100 mL of deionized water to obtain a montmorillonite solution; take 1.5 g of DODMAC and disperse it in 20 mL of 50% (V / V) ethanol-water, heat at 50 °C for 20 min to obtain a DODMAC solution; slowly add the DODMAC solution to the montmorillonite solution, then heat at 80 °C for 8 h, then centrifuge at 8000 rpm, wash the precipitate with 50% (V / V) ethanol-water three times, then dry at 105 °C for 24 h, and then grind through a 300-mesh sieve to obtain modified montmorillonite.
[0056] Comparative Example 1
[0057] A TPU fiber papermaking felt includes a surface fiber layer, a bottom fiber layer, and a TPU fiber layer is also provided between the surface fiber layer and the bottom fiber layer.
[0058] The surface fiber layer and the bottom fiber layer are composed of 10% 6D bicomponent hot-melt polypropylene fiber and 90% 15D polyamide staple fiber, and the thickness of both is 0.3 mm.
[0059] The preparation method of the TPU fiber papermaking felt: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat at 85 °C for 2 h, and then cure at 140 °C for 30 min; at 25 °C, soak in deionized water for 1 h, and then heat-treat at 120 °C for 20 min.
[0060] The preparation method of the TPU fiber layer is as follows:
[0061] First, TPU and montmorillonite are vacuumed at 70 °C for 12 h. Then, 95 parts of TPU, 5 parts of modified montmorillonite, and 0.1 part of antioxidant 619F are blended by weight and added to a rheometer for mixing, followed by spinning. The spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain fibers with a length of 15 mm and a fineness of 50 D. After weaving, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0062] The preparation of the modified montmorillonite includes the following steps:
[0063] Take 5 g of montmorillonite and disperse it in 100 mL of deionized water to obtain a montmorillonite solution; take 1.5 g of DTAC and disperse it in 20 mL of 50% (V / V) ethanol-water, heat it at 50 °C for 20 min to obtain a DTAC solution; slowly add the DTAC solution to the montmorillonite solution, then heat it at 80 °C for 8 h, then centrifuge at 8000 rpm, wash the precipitate 3 times with 50% (V / V) ethanol-water, then dry it at 105 °C for 24 h, and then grind it through a 300-mesh sieve to obtain modified montmorillonite.
[0064] Comparative Example 2
[0065] A TPU fiber papermaking felt includes a surface fiber layer, a bottom fiber layer, and a TPU fiber layer is also provided between the surface fiber layer and the bottom fiber layer.
[0066] The surface fiber layer and the bottom fiber layer are composed of 10% of 6D bicomponent hot-melt polypropylene fibers and 90% of 15D polyamide staple fibers, and their thicknesses are both 0.3 mm.
[0067] The preparation method of the TPU fiber papermaking felt: Place the TPU fiber layer between the surface fiber layer and the bottom fiber layer, heat-treat it at 85 °C for 2 hours, and then cure it at 140 °C for 30 minutes; at 25 °C, soak it in deionized water for 1 hour, and then heat-treat it at 120 °C for 20 minutes.
[0068] The preparation method of the TPU fiber layer is as follows:
[0069] Then, 95 parts of TPU and 0.1 part of antioxidant 619F are blended by weight and added to a rheometer for mixing, followed by spinning. The spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s to obtain fibers with a length of 15 mm and a fineness of 50 D. After weaving, a TPU fiber layer with a thickness of 0.3 mm is obtained.
[0070] Test Example 1
[0071] The mechanical properties of the TPU fiber layers in the examples and comparative examples were tested. The tensile strength was referred to GB / T 1040-2006, and the flexural strength was referred to GB / T 9341-2008.
[0072] Table 1 Performance Test
[0073] Tensile strength / MPa Flexural strength / MPa Example 1 26.4 45.6 Example 2 22.7 42.3 Example 3 20.9 39.8 Comparative Example 1 20.6 30.5 Comparative Example 2 14.5 21.2
[0074] It can be seen from the data in Table 1 that when the TPU fiber layer is mixed with modified montmorillonite, both the tensile strength and the flexural strength are significantly improved compared with Comparative Example 2 without montmorillonite. At the same time, comparing Example 1 and Comparative Example 1, in the modification of montmorillonite, pre-acid treatment can have better mechanical properties.
[0075] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, 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 TPU fiber papermaking felt, characterized in that: It includes a surface fiber layer and a bottom fiber layer, and a TPU fiber layer is provided between the surface fiber layer and the bottom fiber layer; The surface fiber layer and the bottom fiber layer are composed of 10% 6D two-component hot-melt polypropylene fiber and 90% 15D polyamide staple fiber, and the thickness is 0.3mm.
2. The TPU fiber papermaking felt according to claim 1, characterized in that: The preparation method of the TPU fiber layer is: TPU and modified montmorillonite are first vacuumed at 70°C for 12 hours; then 95 parts of TPU, 5 parts of modified montmorillonite and 0.1 parts of 619F antioxidant are blended by weight and added into a rheometer for mixing, and then spinning is carried out. The spinning temperature is 280°C, the room temperature is 30°C, the relative humidity is 65%, and the spinning speed is 1500m / s to obtain TPU fibers with a length of 15mm and a fineness of 50D, and a TPU fiber layer with a thickness of 0.3mm is obtained after weaving.
3. The TPU fiber papermaking felt according to claim 2, characterized in that: The spinning conditions are as follows: a spinning temperature of 280° C., a room temperature of 30° C., a relative humidity of 65%, and a spinning speed of 1500 m / s.
4. The TPU fiber papermaking felt according to claim 3, characterized in that: The TPU fiber has a length of 15 mm and a fineness of 50D.
5. The TPU fiber papermaking felt according to claim 3, characterized in that: The thickness of the TPU fiber layer is 0.3 mm.
6. The TPU fiber papermaking felt according to claim 2, characterized in that: The preparation method of the modified montmorillonite is: Step S1: treating montmorillonite with acid; Step S2: Step S2: Take 5g of acid-treated montmorillonite and disperse it in 100mL of deionized water to obtain a montmorillonite solution; take 1.5g of ammonium chloride and disperse it in 20mL of 50% (V / V) ethanol water, heat it at 50℃ for 20min to obtain an ammonium chloride solution; slowly add the ammonium chloride solution to the montmorillonite solution, then heat it at 80℃ for 8h, then centrifuge it at 8000rpm, wash the precipitate with 50% (V / V) ethanol water 3 times, then dry it at 105℃ for 24h, and then grind it through a 300-mesh sieve to obtain modified montmorillonite.
7. The TPU fiber papermaking felt according to claim 6, characterized in that: The ammonium chloride is selected from one of dodecyltrimethylammonium chloride, hexadecyltriethylammonium chloride and dioctadecyldimethylammonium chloride.
8. The TPU fiber papermaking felt according to claim 7, characterized in that: The ammonium chloride is selected from dodecyltrimethylammonium chloride.
9. The TPU fiber papermaking felt according to claim 6, characterized in that: The method for acid-treating montmorillonite is as follows: 10 g of montmorillonite is dispersed in 100 mL of 1M methanesulfonic acid aqueous solution, refluxed at 110° C. for 2 h, then naturally cooled to room temperature, centrifuged to obtain a precipitate, washed the precipitate with deionized water for 3 times, and then dried at 120° C. to obtain the acid-treated montmorillonite.
10. The method for preparing a TPU fiber papermaking felt according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: placing a TPU fiber layer between a surface fiber layer and a bottom fiber layer, heat treating the layer at 85°C for 2 hours, and then curing the layer at 140°C for 30 minutes; immersing the layer in deionized water at 25°C for 1 hour, and then heat treating the layer at 120°C for 20 minutes.