Method for preparing a foam-coated material based on waste textile fibers

Abstract

The application discloses a preparation method of a foam coating material based on waste textile fibers, which comprises the following steps: (1) preparing a non-woven fabric substrate of waste textile fibers; (2) pre-treating the coating of the non-woven fabric substrate; (3) preparing a foaming coating slurry of the non-woven fabric substrate; and (4) finishing the foaming coating of the non-woven fabric substrate. The waste loose fibers after mechanical treatment are processed into a non-woven fabric by manual carding, the substrate with relatively stable size and high mechanical tensile strength is obtained by carrying out positive and reverse heat pressing and setting at 200 DEG C for 75s, and the substrate is finished by coating to obtain a coating material with relatively soft hand feeling and good hiding property.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of recycling of waste textile fibers, and particularly relates to a preparation method of foam coating material based on waste textile fibers. BACKGROUND

[0002] The textile industry is closely related to people's life. With the expansion of the application field of textiles and the rapid growth of the world population, textile raw materials are increasingly scarce, and their prices have risen sharply. A large amount of waste textiles is buried or burned as garbage, which produces a large amount of harmful gases and difficult-to-degrade substances, causing resource waste and environmental pollution.

[0003] In recent years, in view of the environmental pollution and resource waste caused by the above-mentioned waste textile fibers, the recycling industry of textile waste has emerged as the times require. Chinese patents CN109402867A, CN105887249A, CN106589551A and CN108360144A disclose recycling technologies of waste textile fibers, but the size of the finished base cloth is unstable, the surface flatness is poor, it is difficult to obtain a soft hand feeling, and the covering property of the cloth fails to meet the standard, thus seriously affecting the wearability of the cloth. SUMMARY

[0004] The purpose of the present application is to provide a preparation method of foam coating material based on waste textile fibers. The waste loose fibers after mechanical treatment are processed into non-woven fabric by manual carding, and the size of the base material is relatively stable and the mechanical tensile strength is relatively high after hot pressing and setting pretreatment for 75s on both sides at 200℃. The base material is coated and finished to obtain a coating material with soft hand feeling and good covering property.

[0005] In order to solve the above technical problems, the following technical scheme is adopted:

[0006] The preparation method of foam coating material based on waste textile fibers comprises the following steps:

[0007] (1) Preparation of non-woven fabric base material of waste textile fibers:

[0008] Take waste loose fibers and low-melting point polyester, and process them into non-woven fabric by manual carding. The non-woven fabric is hot pressed and set to prepare a non-woven fabric base material;

[0009] (2) Preparation of foaming coating slurry of non-woven fabric base material

[0010] The foaming coating slurry has the following formula:

[0011]

[0012] The foamed coating slurry is prepared according to the above formula, and no thickening agent is added. After stirring for 5-10 min until the foamed coating slurry has no particle feeling, the thickening agent is added, and stirring is continued for 1-3 min. The foamed coating slurry is prepared after manual whipping.

[0013] (3) Foamed coating finishing of the non-woven fabric substrate: the coating slurry is coated on the non-woven fabric substrate;

[0014] Preferably, the hot pressing temperature in step (1) is 190-210°C, the hot pressing time is 120-180 s, and the non-woven fabric is hot pressed for half the time on each side.

[0015] Preferably, the addition ratio of low-melting-point polyester in step (1) is 10-20%.

[0016] Preferably, before the foamed coating finishing of the non-woven fabric substrate, the non-woven fabric substrate is first subjected to coating pretreatment:

[0017] The pretreatment coating slurry has the following formula:

[0018]

[0019] The coating slurry is prepared according to the above formula, and is ready for use after stirring for 10 min. The non-woven fabric substrate is immersed in the coating slurry for pad treatment, and is dried at 120°C-130°C for 2-5 min after padding.

[0020] Preferably, the thickness of the foamed coating on the non-woven fabric substrate in step (3) is 0.7-1.35 mm.

[0021] Preferably, in step (3), the foamed coating finishing: the non-woven fabric substrate is placed horizontally on the experimental table, a coating plate with a thickness of 1.35 mm is placed above it, a certain amount of foamed coating slurry is placed at one end of the substrate, and then a spatula is used to scrape it down. Pre-drying is performed at 70°C for 1 min, and then baking is performed at 120°C for 1 min.

[0022] Preferably, step (1) is performed by using a hot press to heat press the front and back surfaces of the non-woven fabric in turn, the hot press comprises a machine table and a turnover clamping mechanism, a horizontal heat pressing mechanism and a vertical heat pressing mechanism installed on the machine table, the machine table comprises a horizontal heat pressing surface and a vertical heat pressing surface, the turnover clamping mechanism turns over and clamps the non-woven fabric, when turned over to the horizontal heat pressing surface, the non-woven fabric is placed horizontally, the front surface thereof faces outward, and the front surface heat pressing is performed on the non-woven fabric by using the horizontal heat pressing mechanism; when turned over to the vertical heat pressing surface, the non-woven fabric is placed vertically, the back surface thereof faces outward, and the back surface heat pressing is performed on the non-woven fabric by using the vertical heat pressing mechanism. The turnover clamping mechanism is used to clamp and turn over the non-woven fabric, the clamping action can spread the non-woven fabric flat and stably, and prevent the heat pressing effect from being affected due to deviation and misplacement; the turnover action can switch the non-woven fabric between the horizontal heat pressing surface and the vertical heat pressing surface, so that the double-sided heat pressing is achieved, the hot press is designed ingeniously, the non-woven fabric is turned over without contact, the heat pressing effect is improved, and the operation process is optimized, so that the hot press is safe and reliable.

[0023] Preferably, the machine table is provided with installation grooves on both sides, the turnover clamping mechanisms are installed in the installation grooves on both sides, the turnover clamping mechanism comprises a turnover shaft, an upper turnover rod and a lower turnover rod, the turnover shaft comprises an inner shaft and an outer shaft, the inner shaft and the outer shaft can rotate independently, the outer shaft is connected with the lower turnover rod, and the inner shaft is connected with the upper turnover rod, the upper turnover rod and the lower turnover rod clamp and turn over the non-woven fabric in cooperation; when the front surface heat pressing is performed, the upper turnover rod is turned downward in combination with the lower turnover rod to clamp the non-woven fabric, and the front surface heat pressing is performed on the non-woven fabric by using the horizontal heat pressing mechanism; when the back surface heat pressing is performed, the upper turnover rod, the lower turnover rod and the clamped non-woven fabric are turned upward together to the vertical heat pressing surface, and the back surface heat pressing is performed on the non-woven fabric by using the vertical heat pressing mechanism. The turnover clamping mechanism is composed of the turnover shaft, the upper turnover rod and the lower turnover rod, the turnover shaft is hinged to realize the turnover of the upper turnover rod and the lower turnover rod; the upper turnover rod and the lower turnover rod are consistent in shape and closely attached to each other, and can stably clamp the non-woven fabric; the outer shaft and the inner shaft are independently designed, so that the upper turnover rod and the lower turnover rod can be turned over independently, the horizontal turnover clamping action and the vertical turnover clamping action are facilitated, and the turnover of the front and back surfaces of the non-woven fabric is ingeniously achieved.

[0024] Preferably, the upper turnover rod is provided with a first screw hole, a fastening knob is installed in the first screw hole, the lower turnover rod is provided with a second screw hole, the fastening knob is matched with the second screw hole, and the upper turnover rod and the lower turnover rod are fixed after being connected with each other; the installation groove comprises an upper groove position and a lower groove position, the lower turnover rod is arranged in the lower groove position, and the upper turnover rod is arranged in the upper groove position, electromagnets are arranged in the upper groove position and the lower groove position, and the upper turnover rod and the lower turnover rod are provided with magnets, the electromagnets and the magnets are matched. The fastening knob is used to improve the clamping stability and firmness of the upper turnover rod and the lower turnover rod, prevent the non-woven fabric from falling off or folding, and improve the heat pressing effect; the electromagnets fix the upper turnover rod and the lower turnover rod in the horizontal direction or the vertical direction through the magnets, prevent the non-woven fabric from loosening during the heat pressing process, and further improve the heat pressing effect.

[0025] Preferably, the transverse hot-pressing mechanism comprises an upper cross frame, a first hot-pressing plate, a first operating rod and a first guide support, the lower end of the first operating rod is connected with the first hot-pressing plate, the first hot-pressing plate is threadedly connected with the upper cross frame, the first hot-pressing plate is pressed downward by controlling the rotation of the first operating rod, the first hot-pressing plate is connected with the first guide support, and the first guide support penetrates through the upper cross frame upward.

[0026] Due to the adoption of the above technical scheme, the following beneficial effects are achieved:

[0027] 1. The non-woven fabric substrate is pre-processed by hot pressing in the present application, and the processed non-woven fabric substrate has the advantages of size stability, high mechanical tensile strength and good surface flatness, which improves the surface structure and performance of the non-woven fabric substrate.

[0028] 2. At the hot-pressing temperature in the present application, the hair adhesion of the non-woven fabric substrate after hot-pressing pretreatment is greatly improved, the entanglement degree between fibers is increased, and the breaking strength is significantly improved; and at this temperature, the low-melting-point polyester in the non-woven fabric substrate begins to melt gradually, the melted polyester fibers will adhere to each other, forming multiple adhesion points, and enhancing the integrity of the substrate; therefore, at this hot-pressing temperature, the mechanical properties of the non-woven fabric substrate after hot-pressing treatment are obviously improved.

[0029] 3. At the hot-pressing time in the present application, the movement degree of the molecular chain segments in the crystalline region of the polyester fibers on the surface layer of the non-woven fabric substrate is intensified, the melting degree is gradually increased, the adhesion points formed by the entangled fibers under the action of pressure are increased, and the tensile breaking strength of the non-woven fabric substrate is greatly improved; when the hot-pressing time is less than the hot-pressing time, the movement degree of the molecular chains in the non-crystalline region of the polyester fibers on the surface layer of the non-woven fabric substrate is low, the intermolecular interaction force is not completely decomposed, and the internal temperature has not reached the preset temperature, at this time, the fiber does not completely present a viscous flow state, and the fibers are still simply physically entangled, resulting in low tensile breaking strength of the non-woven fabric substrate. When the hot-pressing time is greater than the hot-pressing time, the breaking strength of the non-woven fabric substrate decreases, and even serious coking and brittle damage occurs, the hand feeling is stiff, and the breaking strength decreases sharply, which is mainly caused by the oxidation of the melted low-melting-point polyester fibers.

[0030] 4. This invention, by adding low-melting-point polyester, distributes the molten low-melting-point polyester throughout the nonwoven substrate, increasing the adhesion points between fibers and enhancing the overall integrity of the nonwoven substrate. Furthermore, at the added proportions of this invention, the mechanical properties of the nonwoven substrate are significantly improved. However, when the proportion of low-melting-point polyester exceeds 15%, the amount of molten low-melting-point polyester increases, resulting in a stiffer feel to the substrate.

[0031] 5. The kaolin used in this invention has a certain degree of opacity, which improves the opacity of the nonwoven substrate and increases the whiteness of the nonwoven substrate through particle accumulation.

[0032] 6. At the coating thickness specified in this invention, the nonwoven fabric substrate has a soft hand feel and its whiteness is significantly improved. Below this coating thickness, the coating does not completely cover the substrate, and most of the original color of the nonwoven fabric substrate is exposed, resulting in lower whiteness. Above this coating thickness, the improvement in whiteness is significantly reduced, but the nonwoven fabric substrate becomes stiffer. Attached Figure Description

[0033] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the preparation process of nonwoven fabrics;

[0035] Figure 2 This is a graph showing the effect of hot pressing temperature on the tensile strength of nonwoven fabrics.

[0036] Figure 3 The graph shows the effect of the proportion of low-melting-point polyester on the tensile strength of nonwoven fabrics.

[0037] Figure 4 This is a graph showing the effect of hot pressing time on the tensile strength of nonwoven fabrics.

[0038] Figure 5 This is a graph showing the variation of Ganz-Baidu clay with the amount of kaolin used.

[0039] Figure 6 This is a graph showing the change in blue light whiteness with the amount of kaolin used.

[0040] Figure 7 This is a graph showing the variation of Hunter whiteness with the amount of kaolin used;

[0041] Figure 8 The shielding performance of coated nonwoven fabrics with different thicknesses is shown in the diagram.

[0042] Figure 9 Performance graphs of coated nonwoven fabrics with different amounts of thickener;

[0043] Figure 10 This is a schematic diagram of the hot press.

[0044] Figure 11 This is a schematic diagram of the hot press machine.

[0045] Figure 12 This is a schematic diagram of the flip-clamping mechanism;

[0046] Figure 13 A schematic diagram of the structure of the flipping clamping mechanism at another angle;

[0047] Figure 14 This is a schematic diagram of the transverse hot pressing mechanism;

[0048] Figure 15 This is a schematic diagram of the vertical hot pressing mechanism.

[0049] Machine base 1, horizontal hot pressing surface 11, vertical hot pressing surface 12, mounting slot 13, lower slot 131, upper slot 132, electromagnet 133, flipping clamping mechanism 2, flipping shaft 21, outer shaft 211, inner shaft 212, lower flipping rod 22, upper flipping rod 23, fastening knob 231, first screw hole 232, second screw hole 221, handle 24, magnet 25, horizontal hot pressing mechanism 3, upper horizontal frame 31, first hot pressing plate 32, first operating lever 33, first guide bracket 34, vertical hot pressing mechanism 4, side vertical frame 41, second hot pressing plate 42, second operating lever 43, second guide bracket 44. Detailed Implementation

[0050] This invention aims to provide a method for preparing foam coating materials based on waste textile fibers. By processing mechanically treated waste loose fibers into nonwoven fabric through manual combing, and performing hot pressing and shaping pretreatment at 200°C for 75s on each side, a substrate with relatively stable dimensions and high mechanical tensile strength can be obtained. The substrate is then coated to obtain a coating material with a soft hand feel and good coverage.

[0051] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0052] Example 1

[0053] Waste loose fibers and low-melting-point polyester are processed into nonwoven fabric by hand combing. The nonwoven fabric is then pretreated by hot pressing to obtain nonwoven fabric substrate. The hot pressing temperature is 190℃ and the hot pressing time is 120s. The proportion of low-melting-point polyester added is 15%.

[0054] Example 2

[0055] The only difference from Example 1 is that the hot pressing temperature is 200°C.

[0056] Example 3

[0057] The only difference from Example 1 is that the hot pressing temperature is 210°C.

[0058] Compare with Example 1

[0059] The only difference from Example 1 is that the hot pressing temperature is 170°C.

[0060] Compare with Example 2

[0061] The only difference from Example 1 is that the hot pressing temperature is 180°C.

[0062] The tensile strength of the nonwoven fabrics prepared in Examples 1-3 and Comparative Examples 1-2 was measured respectively, and the results are as follows: Figure 2 As shown, the tensile strength of the nonwoven fabric gradually increases with the increase of the hot-pressing temperature. This is because the nonwoven fabric's hair adhesion is greatly improved after hot-pressing pretreatment, and the degree of entanglement between fibers increases. When the hot-pressing temperature is 190℃, the low-melting-point polyester begins to melt gradually. The molten polyester fibers will bond together, producing multiple bonding points, which enhances the overall integrity of the nonwoven fabric. Therefore, with the increase of the hot-pressing temperature, the mechanical properties of the nonwoven fabric are significantly improved. However, when the temperature exceeds 200℃, the degree of melting of the polyester fibers increases, the nonwoven fabric feels stiff, and at the same time, the surface of the nonwoven fabric shows yellowing or even charring.

[0063] The tensile strength at break was tested according to the standard GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break". A WH-5000 electronic tensile testing machine was used to test the samples at an environment of 25℃ and 60% humidity. (The same applies below.)

[0064] Example 4

[0065] Waste loose fibers and low-melting-point polyester are processed into nonwoven fabric by hand combing. The nonwoven fabric is then pretreated by hot pressing to obtain nonwoven fabric substrate. The hot pressing temperature is 200℃ and the hot pressing time is 120s. The addition ratio of low-melting-point polyester is 10%.

[0066] Example 5

[0067] The only difference from Example 4 is that the proportion of low-melting-point polyester added is 15%.

[0068] Example 6

[0069] The only difference from Example 4 is that the proportion of low-melting-point polyester added is 20%.

[0070] Compare with Example 3

[0071] The only difference from Example 4 is that the addition ratio of low melting point polyester is 0%.

[0072] Compare with Example 4

[0073] The only difference from Example 4 is that the proportion of low-melting-point polyester added is 5%.

[0074] Compare with Example 5

[0075] The only difference from Example 4 is that the proportion of low-melting-point polyester added is 25%.

[0076] The tensile strength of the nonwoven fabrics prepared in Examples 4-6 and Comparative Examples 3-5 was measured respectively, and the results are as follows: Figure 3 As shown, the breaking strength of nonwoven fabric gradually increases with the increase of the proportion of low-melting-point polyester. This is because when the proportion of low-melting-point polyester increases, there is more molten low-melting-point polyester, the bonding points between fibers increase, and the overall integrity of the nonwoven fabric is enhanced. Therefore, with the increase of the proportion of low-melting-point polyester, the mechanical properties of nonwoven fabric are significantly improved. However, when the proportion of low-melting-point polyester exceeds 15%, the amount of molten low-melting-point polyester increases, and the nonwoven fabric feels stiff.

[0077] Example 7

[0078] Waste loose fibers and low-melting-point polyester are processed into nonwoven fabric by hand combing. The nonwoven fabric is then pretreated by hot pressing to obtain nonwoven fabric substrate. The hot pressing temperature is 200℃ and the hot pressing time is 120s (60s on each side). The proportion of low-melting-point polyester added is 15%.

[0079] Example 8

[0080] The only difference from Example 7 is that the hot pressing time is 150s (75s for each side).

[0081] Example 9

[0082] The only difference from Example 7 is that the hot pressing time is 180s (90s for each side).

[0083] Compare with Example 6

[0084] The only difference from Example 7 is that the hot pressing time is 90s (45s for each side).

[0085] Compare with Example 7

[0086] The only difference from Example 7 is that the hot pressing time is 210s (105s for each side).

[0087] Compare with Example 8

[0088] The only difference from Example 7 is that the hot pressing time is 240s (120s for each side).

[0089] The tensile strength of the nonwoven fabrics prepared in Examples 7-9 and Comparative Examples 6-8 was measured respectively, and the results are as follows:Figure 4 As shown, the tensile breaking strength of the nonwoven fabric first increases and then decreases with increasing hot-pressing time. When the hot-pressing time is short, the molecular chain movement of the non-crystalline region of the polyester fibers on the surface of the nonwoven fabric is low, the intermolecular interaction forces are not completely broken, and the internal temperature has not yet reached the preset temperature. At this time, it does not fully exhibit a viscous flow state, and the fibers are still simply physically entangled, resulting in a low tensile breaking strength of the nonwoven fabric. According to the time-temperature equivalence principle, increasing the hot-pressing time is equivalent to increasing the hot-pressing temperature. Therefore, as the hot-pressing time increases, the molecular chain segment movement in the crystalline region of the polyester fiber on the surface of the nonwoven fabric intensifies, the degree of melting gradually increases, and the bonding points formed by the intertwined fibers under pressure increase. The tensile breaking strength of the nonwoven fabric is greatly improved. However, after the hot-pressing time exceeds 150s, the breaking strength of the nonwoven fabric decreases. After exceeding 210s, the nonwoven fabric is severely charred and brittle, feels stiff, and the breaking strength drops sharply. This is mainly due to the oxidation of the molten low-melting-point polyester fibers.

[0090] Example 10

[0091] The nonwoven fabric substrate from Example 1 was subjected to impregnation and then foamed coating treatment. 50g of foamed polyurethane 3501B-PU, 4g of foam stabilizer SY-P1, 1g of crosslinking agent ZQ10, 30% of 6000-mesh kaolin, and 1g of thickener were used to prepare a foamed coating slurry. The coating slurry was then coated onto the nonwoven fabric substrate, with a coating thickness of 1.35mm.

[0092] Example 11

[0093] The difference from Example 10 is that the percentage of 6000 mesh kaolin used is 35%.

[0094] Compare with Example 9

[0095] The difference from Example 10 is that the percentage of 6000 mesh kaolin used is 20%.

[0096] Compare with Example 10

[0097] The difference from Example 10 is that the percentage of 6000 mesh kaolin used is 25%.

[0098] Compare with Example 11

[0099] The difference from Example 10 is that the percentage of 6000 mesh kaolin used is 40%.

[0100] The whiteness of the nonwoven fabric substrates after coating treatment in Examples 10-11 and Control Examples 9-11 was measured to investigate the hiding power of the coating on the nonwoven fabric substrates. The results are as follows: Figures 5-7As shown, the whiteness of the substrate after coating treatment initially increases and then decreases with increasing kaolin content. When the kaolin content is below 35%, whiteness increases, mainly because kaolin has a certain covering power; as the amount of kaolin increases, the particles become more densely packed, resulting in better covering power and higher whiteness. When the kaolin content is above 35%, whiteness decreases. This is because kaolin itself is grayish, and at excessively high contents, the coating color darkens, leading to a decrease in whiteness.

[0101] Example 12

[0102] The difference from Example 10 is that the coating thickness is 0.9 mm.

[0103] Example 13

[0104] The difference from Example 13 is that the coating thickness is 1.35 mm.

[0105] Compare with Example 12

[0106] The difference from Example 13 is that the coating thickness is 0.45 mm.

[0107] The hiding power of the coatings in Examples 12, 13, and Control Example 12 on nonwoven fabric substrates was measured, and the results are as follows: Figure 8 As shown in Table 1;

[0108] Coating thickness Ganz whiteness Blue light whiteness Hunter whiteness 0.45 mm 60.07 62.51 78.91 0.9 mm 76.29 82.31 91.48 1.35 mm 77.13 84.78 93.06

[0109] As the coating thickness increases, the whiteness of the nonwoven fabric substrate gradually increases. Because the substrate itself is not smooth, as shown in the figure, when the coating thickness is 0.45mm, the coating does not completely cover the substrate, and some areas reveal the original color, resulting in lower whiteness. When the coating thickness is 0.9mm, the substrate is completely covered, and the whiteness is significantly improved, with the substrate feeling softer. When the coating thickness is 1.35mm, the whiteness also improves slightly, but the feel becomes stiffer.

[0110] Example 14

[0111] The difference from Example 10 is that the amount of thickener used is 0.6g.

[0112] Example 15

[0113] The difference from Example 14 is that the amount of thickener used is 0.8g.

[0114] Example 16

[0115] The difference from Example 14 is that the amount of thickener used is 1.0g.

[0116] Compare with Example 13

[0117] The difference from Example 14 is that the amount of thickener used is 0.2g.

[0118] Compare with Example 14

[0119] The difference from Example 14 is that the amount of thickener used is 0.4g.

[0120] The coating properties of Examples 14-16 and Comparative Examples 13-14 were measured, such as... Figure 9 As shown, when the amount of thickener is less than 0.2g, the coating cracks.

[0121] Example 17

[0122] like Figures 10-15 As shown, in Examples 1-9, a hot press is used to sequentially hot press the front and back sides of the nonwoven fabric. The hot press includes a machine base 1 and a flipping clamping mechanism 2, a horizontal hot pressing mechanism 3, and a vertical hot pressing mechanism 4 installed on the machine base 1. The machine base 1 includes a horizontal hot pressing surface 11 and a vertical hot pressing surface 12. The flipping clamping mechanism 2 flips and clamps the nonwoven fabric. When flipped to the horizontal hot pressing surface 11, the nonwoven fabric is placed horizontally with its front side facing outwards, and the front side is hot pressed by the horizontal hot pressing mechanism 3. When flipped to the vertical hot pressing surface 12, the nonwoven fabric is placed vertically with its back side facing outwards, and the back side is hot pressed by the vertical hot pressing mechanism 4. This invention utilizes a flipping clamping mechanism 2 to clamp and flip the nonwoven fabric. The clamping action can lay it out flat and stably, preventing the hot pressing effect from being affected by displacement or misalignment. The flipping action can switch the nonwoven fabric between the horizontal hot pressing surface 11 and the vertical hot pressing surface 12, thereby achieving the purpose of double-sided hot pressing. This hot press machine is ingeniously designed to achieve the purpose of non-contact flipping of the nonwoven fabric, which not only improves the hot pressing effect but also optimizes the operation process, making it safe and reliable.

[0123] The machine base 1 has mounting slots 13 on both sides. The mounting slots 13 are L-shaped and include a lower slot 131 and an upper slot 132. A flip clamping mechanism 2 is installed in the mounting slots 13 on both sides. The flip clamping mechanism 2 includes a flip shaft 21, an upper flip rod 23 and a lower flip rod 22. The flip shaft 21 is installed at the middle corner of the L-shaped mounting slot 13 and includes an inner shaft 212 and an outer shaft 211. The inner shaft 212 and the outer shaft 211 are separated by a partition and can rotate independently. The outer shaft 211 is connected to the lower flip rod 22, which is placed in the lower slot 131 of the mounting groove 13 and can be flipped upward. The thickness of the lower flip rod 22 is the same as the depth of the lower slot 131 of the mounting groove 13, that is, the lower flip rod 22 is flush with the horizontal hot pressing surface 11. The inner shaft 212 is connected to the upper flip rod 23, which is placed in the upper slot 132 of the mounting groove 13 and can be flipped downward. The thickness of the upper flip rod 23 is the same as the depth of the upper slot 132 of the mounting groove 13, that is, the upper flip rod 23 is flush with the vertical hot pressing surface 12.

[0124] The upper flipping rod 23 and the lower flipping rod 22 work together to clamp and flip the nonwoven fabric. During the front hot pressing, the upper flipping rod 23 flips downward and works with the lower flipping rod 22 to clamp the nonwoven fabric. The front hot pressing is performed on the nonwoven fabric with the help of the transverse hot pressing mechanism 3. During the reverse hot pressing, the upper flipping rod 23, the lower flipping rod 22 and the clamped nonwoven fabric are flipped upward to the vertical hot pressing surface 12. The reverse hot pressing is performed on the nonwoven fabric with the help of the vertical hot pressing mechanism 4. The flipping clamping mechanism 2 consists of a flipping shaft 21, an upper flipping rod 23, and a lower flipping rod 22. The flipping shaft 21 is hinged, allowing the upper flipping rod 23 and the lower flipping rod 22 to be flipped. The upper flipping rod 23 and the lower flipping rod 22 have the same shape and fit tightly together, which can stably clamp the nonwoven fabric. The independent design of the outer shaft 211 and the inner shaft 212 allows the upper flipping rod 23 and the lower flipping rod 22 to be flipped independently, which facilitates the horizontal flipping clamping action and the vertical flipping clamping action, and cleverly achieves the purpose of flipping the nonwoven fabric to the front and back.

[0125] The upper flip rod 23 has a first screw hole 232, in which a fastening knob 231 is installed. The first screw hole 232 is divided into a screw hole section and a through hole section. The fastening knob 231 includes a knob part and a screw part. The knob part is placed in the through hole section, and the screw part is threadedly connected to the screw hole section. The lower flip rod 22 has a second screw hole 221. The screw part of the fastening knob 231 matches the second screw hole 221. After the two are connected, the upper flip rod 23 and the lower flip rod 22 are fixed. An electromagnet 133 is provided in both the upper slot 132 and the lower slot 131. A magnet 25 is provided in both the upper flip rod 23 and the lower flip rod 22. The electromagnet 133 matches the magnet 25. The fastening knob 231 is used to improve the clamping stability and firmness of the upper flip rod 23 and the lower flip rod 22, preventing the nonwoven fabric from falling off or folding, thereby improving the hot pressing effect. The electromagnet 133 fixes the upper flip rod 23 and the lower flip rod 22 horizontally or vertically by means of the magnet 25, preventing the nonwoven fabric from loosening during the hot pressing process, further improving the hot pressing effect. Both the upper flip rod 23 and the lower flip rod 22 are equipped with handles 24 for convenient operation by the testing personnel.

[0126] The horizontal hot pressing mechanism 3 includes an upper horizontal frame 31, a first hot pressing plate 32, a first operating rod 33, and a first guide bracket 34. The lower end of the first operating rod 33 is connected to the first hot pressing plate 32, which is threadedly connected to the upper horizontal frame 31. By controlling the rotation of the first operating rod 33, the first hot pressing plate 32 is driven to press down. The first hot pressing plate 32 is connected to the first guide bracket 34, which passes through the upper horizontal frame 31 upwards. The vertical hot pressing mechanism 4 includes a side vertical frame 41, a second hot pressing plate 42, a second operating rod 43, and a second guide bracket 44. The rear end of the second operating rod 43 is connected to the second hot pressing plate 42, which is threadedly connected to the side vertical frame 41. By controlling the rotation of the second operating rod 43, the second hot pressing plate 42 is driven to press backwards. The second hot pressing plate 42 is connected to the second guide bracket 44, which passes through the side vertical frame 41 forwards.

[0127] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A method for preparing foam coating materials based on waste textile fibers, characterized in that... Includes the following steps: (1) Preparation of nonwoven fabric substrate from waste textile fibers: Waste loose fibers and low-melting-point polyester are processed into nonwoven fabric by hand carding. This nonwoven fabric is then pre-treated by hot pressing to obtain the nonwoven fabric substrate. The hot pressing temperature is 190-200℃, and the hot pressing time is 120-180s, with each side of the nonwoven fabric being hot-pressed for half the time. The proportion of low-melting-point polyester added is 10-15%. A hot press is used to sequentially hot press the front and back sides of a nonwoven fabric. The hot press includes a machine base and a flipping and clamping mechanism, a horizontal hot pressing mechanism, and a vertical hot pressing mechanism mounted on the machine base. The machine base includes a horizontal hot pressing surface and a vertical hot pressing surface. The flipping and clamping mechanism flips and clamps the nonwoven fabric. When flipped to the horizontal hot pressing surface, the nonwoven fabric is placed horizontally with its front side facing out, and the horizontal hot pressing mechanism performs front hot pressing on it. When flipped to the vertical hot pressing surface, the nonwoven fabric is placed vertically with its back side facing out, and the vertical hot pressing mechanism performs back hot pressing on it. (2) Preparation of foamed coating paste for nonwoven fabric substrate Before the foam coating finish, the nonwoven fabric substrate undergoes a pre-treatment process: The pretreatment coating paste formulation is as follows: Deionized water, 90-110 parts by weight Waterborne polyurethane, 10-15 parts by weight Kaolin, 32-45 parts by weight Silane coupling agent KH-550, 0.1-0.5% by weight. Dispersant CF-10, 0.1-0.4% by weight. Prepare the coating slurry according to the above formula, stir for 10 minutes and set aside; immerse the nonwoven fabric substrate in the coating slurry for padding treatment, and dry at 120℃-130℃ for 2-5 minutes after padding. The formula for the foamed coating paste is as follows: 3501B-PU foam, 45-60 parts by weight Foam stabilizer SY-P1, 2-5 parts by weight Crosslinking agent ZQ10, 1-2 parts by weight 6000 mesh kaolin, used at a percentage of 28-35%. Thickener Z46, 0.6-1 parts by weight Prepare the foam coating slurry according to the above formula, without adding thickener. Stir for 5-10 minutes until the foam coating slurry has no grainy texture, then add thickener and continue stirring for 1-3 minutes. After manual whipping, the foam coating slurry is obtained. (3) Foaming coating finishing of nonwoven fabric substrate: The coating paste is applied to the nonwoven fabric substrate, and the thickness of the foaming coating on the nonwoven fabric substrate is 0.7-0.9mm.

2. The method for preparing foam coating material based on waste textile fibers according to claim 1, characterized in that: Step (3) Foaming coating finishing: Place the nonwoven fabric substrate horizontally on the test bench, place a coating plate with a thickness of 1.35mm on it, take a certain amount of foaming coating paste and place it on one end of the substrate, then scrape it off with a scraper, pre-bake at 70℃ for 1min, and then bake at 120℃ for 1min.

3. The method for preparing foam coating material based on waste textile fibers according to claim 1, characterized in that: The machine tool has mounting slots on both sides, and the flipping clamping mechanism is installed in each of the mounting slots on both sides. The flipping clamping mechanism includes a flipping shaft, an upper flipping rod, and a lower flipping rod. The flipping shaft includes an inner shaft and an outer shaft. The inner shaft and the outer shaft can rotate independently. The outer shaft is connected to the lower flipping rod, and the inner shaft is connected to the upper flipping rod. The upper flipping rod and the lower flipping rod cooperate to clamp and flip the nonwoven fabric. During front-side hot pressing, the upper flipping rod flips downward and cooperates with the lower flipping rod to clamp the nonwoven fabric. The front-side hot pressing is performed on the nonwoven fabric with the help of the transverse hot pressing mechanism. During reverse-side hot pressing, the upper flipping rod, the lower flipping rod, and the clamped nonwoven fabric are flipped upward to the vertical hot pressing surface. The reverse-side hot pressing is performed on the nonwoven fabric with the help of the vertical hot pressing mechanism.

4. The method for preparing foam coating material based on waste textile fibers according to claim 3, characterized in that: The upper flip rod has a first screw hole, in which a fastening knob is installed. The lower flip rod has a second screw hole, and the fastening knob matches the second screw hole. When the two are connected, the upper flip rod and the lower flip rod are fixed. The mounting slot includes an upper slot and a lower slot. The lower slot houses the lower flip rod, and the upper slot houses the upper flip rod. Both the upper slot and the lower slot are equipped with electromagnets. Both the upper flip rod and the lower flip rod are equipped with magnets, and the electromagnets match the magnets.

5. The method for preparing foam coating material based on waste textile fibers according to claim 1, characterized in that: The horizontal hot pressing mechanism includes an upper horizontal frame, a first hot pressing plate, a first operating rod, and a first guide bracket. The lower end of the first operating rod is connected to the first hot pressing plate and is threadedly connected to the upper horizontal frame. By controlling the rotation of the first operating rod, the first hot pressing plate is pressed down. The first hot pressing plate is connected to the first guide bracket, which extends upward through the upper horizontal frame. The vertical hot pressing mechanism includes a side vertical frame, a second hot pressing plate, a second operating rod, and a second guide bracket. The rear end of the second operating rod is connected to the second hot pressing plate and is threadedly connected to the side vertical frame. By controlling the rotation of the second operating rod, the second hot pressing plate is pressed backward. The second hot pressing plate is connected to the second guide bracket, which extends forward through the side vertical frame.

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