A continuous feeding imitation memory PBT slice production process

Abstract

The present invention relates to the technical field of PBT slices, and in particular to a continuous-feed simulated memory PBT slice production process. By introducing a continuous-feed simulated memory PBT slice device, PBT polyester is heated to a molten state, and then injected into the PBT slice device by injection molding. A slicing knife is placed in the molten state and cooled to shape. This greatly avoids mechanical cutting and damage to the mechanical properties of the PBT slices caused by slicing after the PBT is shaped, thereby ensuring that the mechanical properties and elastic recovery effects of the PBT slices are excellent when used to prepare simulated memory fibers.

Description

Technical Field

[0001] The invention relates to the technical field of PBT slices, in particular to a continuous feeding simulated memory PBT slice production process. Background Art

[0002] Memory fabric refers to fabric with shape memory function. When this fabric is used to make clothing and other products, it does not require external support. It can independently maintain any shape and present any wrinkles. It can be completely restored to a flat state with a light touch of the hand without leaving any creases, and its shape retention is permanent.

[0003] However, the high production cost of memory fabrics in the existing technology has limited the application range of memory fabrics. Therefore, in order to reduce costs, textile R&D personnel have begun to manufacture imitation memory fabrics. For example, Patent No. 202111118607.6 discloses a process of preparing PBT slices for imitation memory fibers through monomer preparation-condensation synthesis-raw material modification-slice preparation. The obtained imitation memory fibers have high fullness, good comfort, strong resilience, and good antistatic effect.

[0004] Another example: Patent No. 201921382569.3 discloses a slicer for modified PBT raw materials that is easy to feed continuously, which solves the problems of manual loading and unloading and high labor intensity in the existing technology, and realizes continuous feeding and slicing of PBT raw materials.

[0005] However, in the prior art, after the PBT raw material or modified PBT raw material is formed, the PBT polyester material is cut into corresponding sheets or granules by a cutting knife. This not only causes the PBT polyester material after forming to be affected by the mechanical action of cutting, resulting in unsatisfactory mechanical properties, but also causes large energy consumption in the subsequent cutting process, high wear of the cutting knife, and high cost. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a continuous feeding imitation memory PBT slice production process, which not only ensures that the obtained PBT slices have excellent mechanical properties when used in the production of imitation memory fibers, and have good mechanical properties and elastic properties, but also avoids the defect of high energy consumption caused by the need to apply a large force to the cutting knife when cutting with a cutting knife, thereby reducing the production of PBT slices.

[0007] This is achieved specifically through the following technical solutions:

[0008] The continuous feeding imitation memory PBT slice production process includes the following steps:

[0009] S1: Heat up PBT polyester to prepare a molten state to obtain a PBT melt;

[0010] S2: Use a continuous feeding memory-like PBT slicing device. Through injecting the PBT melt into a mold - putting in a slicing knife - cooling and shaping - tipping out of the mold - separating the slicing knife - packaging, it is obtained;

[0011] The cooling and shaping is carried out at a temperature of 20 - 30 °C for at least 2 h.

[0012] After introducing a continuous feeding memory-like PBT slicing device and realizing heating up PBT polyester to prepare a molten state, using an injection molding method, injecting it into the PBT slicing device, and using the method of putting in a slicing knife - cooling and shaping in the molten state, it greatly avoids damaging the mechanical properties of PBT slices caused by mechanical cutting after PBT shaping, and ensures that when PBT slices are applied to prepare memory-like fibers, their mechanical properties and elastic recovery effect are relatively good.

[0013] In order to be able to arrange a slicing knife in the molten state of PBT slices and use the method of separating with the slicing knife to realize separating and slicing the molten PBT polyester material, thereby reducing energy consumption. Preferably, the continuous feeding memory-like PBT slicing device includes a cooling conveyor belt, and a driving wheel is provided at the left end of the cooling conveyor belt, a driven wheel is provided at the right end of the cooling conveyor belt, and a sorting conveyor belt is provided directly below the driven wheel; a driven wheel is provided at the left end of the sorting conveyor belt, and a driving wheel is provided at the right end of the sorting conveyor belt, and a packaging cart is provided directly below the driving wheel on the sorting conveyor belt; a melt discharge pipe is provided directly above the driving wheel on the cooling conveyor belt, and along the running direction of the cooling conveyor belt, a knife placing box is closely arranged beside the melt discharge pipe, and a number of slicing knives are placed in the knife placing box; a cooling box is provided behind the knife placing box, and the cooling conveyor belt passes through the cooling box; a number of mold grooves are fixedly provided on the cooling conveyor belt, and the melt discharge pipe can inject the PBT melt into the mold grooves, and the cutting blades can just enter the mold grooves.

[0014] In order to be able to better ensure that the PBT melt is cooled and shaped, preferably, the transportation speed of the cooling conveyor belt can make the transportation time in the cooling box at least 2 h, and the temperature in the cooling box is 20 - 30 °C.

[0015] In order to be able to ensure the smooth operation of the cooling conveyor belt, preferably, the cooling conveyor belt is formed by connecting a number of accommodating units end to end, and adjacent two accommodating units are connected by a hinge. More preferably, the size inside the accommodating unit is 3 cm × 3 cm × 1 cm. More preferably, the cutting blades are in the shape of "one", "ten", "well", "king", "soil" or "dry".

[0016] To modify the PBT polyester material, preferably, in step S1, an inorganic modifier, representing 5-10% by weight of the PBT polyester, is added during the heating and melting process. More preferably, the inorganic modifier is obtained by mixing fluorite tailings with a 1-10% by weight ammonium sulfate solution at a mass ratio of 1:10-15, allowing the mixture to rest for 30 minutes, then subjecting the mixture to a nitrogen atmosphere at 50-60°C for 1 hour, and ball milling the mixture through a 3000 mesh sieve. More preferably, the mass ratio of the fluorite tailings to the ammonium sulfate solution is 1:11, and the ammonium sulfate solution has a mass concentration of 3%.

[0017] Compared with the prior art, the technical effects created by the present invention are embodied in:

[0018] The present invention utilizes a process that involves melting PBT polyester material, injection molding, inserting a slicing knife, cooling and shaping, flipping the mold over, removing the slicing knife, and packaging. This not only avoids the damage and high energy consumption of mechanical cutting caused by slicing the PBT after shaping, but also ensures continuous feeding of PBT slices, ensuring the continuity of the process flow, improving work efficiency, and reducing costs. Furthermore, the present invention has a simple process flow, low energy consumption, and low processing costs, making it easier to promote and implement industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Create a process flow chart for this invention.

[0020] Figure 2 The present invention creates a schematic diagram of the process device structure.

[0021] Figure 3 Schematic diagram of the cooling conveyor belt slicing structure.

[0022] 1- melt pipe 2- knife box 3- cooling box 4- driven wheel 5- driving wheel 6- support column 7- sorting conveyor belt 8- packaging car 9- slicing knife 10- cooling conveyor belt 11- PBT slices;

[0023] 3.1-Import 3.2-Export;

[0024] 10.1- Accommodation unit 10.2- Hinge. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further defined below in conjunction with the accompanying drawings and specific implementation methods, but the scope of protection required is not limited to the description.

[0026] like Figure 2As shown, a continuously fed imitation memory PBT slicing device includes a cooling conveyor belt 10, and a driving wheel 5 is provided at the left end of the cooling conveyor belt 10, a driven wheel 4 is provided at the right end of the cooling conveyor belt 10, and a sorting conveyor belt 7 is provided directly below the driven wheel 4; a driven wheel 4 is provided at the left end of the sorting conveyor belt 7, and a driving wheel 5 is provided at the right end of the sorting conveyor belt 7, and a packaging vehicle 8 is provided directly below the driving wheel 5 on the sorting conveyor belt 7; a melt discharge pipe 1 is provided directly above the driving wheel 5 on the cooling conveyor belt 10, and a knife box 2 is provided close to the melt discharge pipe 1 along the running direction of the cooling conveyor belt 10, and a plurality of slicing knives 9 are placed in the knife box 2; a cooling box 3 is provided behind the knife box 2, and the cooling conveyor belt 10 passes through the cooling box 3; a plurality of mold grooves are fixedly provided on the cooling conveyor belt 10, and the melt discharge pipe 1 can inject the PBT melt into the mold groove, and the cutting blade 9 can just enter the mold groove.

[0027] During the operation of the device, the PBT polyester material is prepared into a molten state, and then a modifier is mixed in or not mixed in, and the material is injected into the mold cavity located on the cooling conveyor belt 10 through the action of the melt discharge pipe 1. After the injection and flattening are completed, the mold cavity is conveyed to the bottom of the knife box 2 under the action of the cooling conveyor belt 10, and a group of slicing knives 9 located in the knife box 2 falls into the mold cavity. Then, under the action of gravity of free fall, the PBT melt in the mold cavity is separated to form block-shaped PBT slices 11, and with the action of the cooling conveyor belt 10, the PBT slices 11 are separated from the mold cavity. Figure 2 The inlet 3.1 at the left end of the cooling box 3 shown is fed into the cooling box 3, and is controlled by the conveying rate of the cooling conveyor belt 10 to be transported out from the outlet 3.2 at the right end of the cooling box 3. The entire process from the inlet 3.1 to the discharge from the outlet 3.2 is maintained for more than 2 hours. At the same time, the temperature in the cooling box 3 is maintained between 20-30°C, thereby realizing cooling and shaping the separated block PBT slices 11 at 20-30°C. At the same time, as the cooling conveyor belt 10 runs, it is overturned from the driven wheel 4 end, and then the PBT slices 11 and the slicing knife 9 that are cooled and shaped on the cooling conveyor belt 10 are poured onto the sorting conveyor belt 7 together. The slicing knife 9 is identified manually or by a machine, and is separated from the shaped PBT slices 11. The slicing knife 9 is transported to the knife box 2 via the conveyor belt or manually for placement. The PBT slices 11 are packaged by the packaging vehicle 8 and transported to the warehouse for storage, thereby completing the production of PBT slices. This device can fully meet the following requirements: Figure 1 The production requirements of the shown PBT melt are continuous feeding - injection molding - placing the slicing knife - cooling and shaping - flipping out of the mold - separating the slicing knife - packaging process.

[0028] The specific process of producing imitation memory PBT slices using the above device includes the following steps:

[0029] (1) heating the PBT polyester to a molten state to obtain a PBT melt;

[0030] (2) The PBT melt is injected into a mold, placed in a slicing knife, cooled and shaped, turned over and ejected from the mold, separated from the slicing knife, and packaged to obtain the product; the cooling and shaping is performed at a temperature of 20-30° C. for at least 2 hours.

[0031] Under this process, the cooling and shaping process is fully utilized to achieve the free separation of the PBT slice structure, reducing the energy consumption required for slicing the PBT polyester after melting and cooling, which causes the slicing knife to require greater force. This simplifies the process flow and ensures continuous feeding production throughout the entire production process, thereby improving production efficiency and reducing costs.

[0032] In some embodiments, the cooling conveyor belt 10 can transport the PBT melt at a speed of at least 2 hours in the cooling box 3 and keep the temperature in the cooling box 3 at 20-30° C. This ensures that the PBT melt is sufficiently cooled and shaped, achieving high efficiency in flipping out of the mold.

[0033] In certain embodiments, the cooling conveyor 10 is composed of a plurality of accommodating units 10.2 connected end to end, with adjacent accommodating units 10.2 connected by hinges 10.2. This ensures that the cooling conveyor 10 can freely rotate and move under the control of the driving wheel 5 and the driven wheel 4, improving the flexibility of the equipment operation while ensuring that the PBT melt can be fixedly molded.

[0034] In some embodiments, the dimensions of the accommodation unit 10.2 are selected from, but not limited to, 3 cm x 3 cm x 1 cm. Specific dimensions can be adjusted and matched according to production needs.

[0035] In some embodiments, the cutting blade 9 is in the shape of a "one", "ten", "well", "king", "earth" or "stem". This simplifies the structure of the slicing blade 9 while being able to separate the PBT melt into several pieces in a molten state to achieve a slicing effect.

[0036] In certain embodiments, in step S1, an inorganic modifier accounting for 5-10% of the mass of the PBT polyester is added during the heating and melting process of the PBT polyester. The addition of the modifier improves the comprehensive performance of the PBT slice, thereby improving the mechanical properties and tensile elastic recovery of the PBT slice when it is used to prepare memory-like fibers. In certain embodiments, the inorganic modifier is obtained by mixing fluorite tailings with ammonium sulfate solution with a mass concentration of 1-10%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., in a mass ratio of 1:10-15, for example, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, etc., and then allowing it to stand for 30 minutes. The mixture is then placed in a nitrogen atmosphere at a temperature of 50-60°C, for example, 50°C, 55°C, 58°C, 60°C, etc., for 1 hour, and then ball-milled in a ball mill to pass through a 3000 mesh sieve.

[0037] In order to better explain the technical effects of the present invention and to facilitate those skilled in the art to accurately understand the technical solutions of the present invention, the present researcher makes the following detailed description of the relevant contents during the research process.

[0038] Example 1

[0039] Take PBT polyester, place it in a mixing tank, and heat it to a molten state to obtain a PBT melt; use the above-mentioned continuous feeding imitation memory PBT slicing device to inject the PBT melt into a mold groove with a specification of 3cm×3cm×1cm through the melt discharge pipe 1, use a "cross" slicing knife 9 to put it into the mold groove, and convey it into the cooling box 3 through the cooling conveyor belt 10. The temperature in the cooling box 3 is 20°C. The processing time in the cooling box 3 is 2h, and then the slicing knife 9 and the cooled and formed PBT slices 11 are poured out by turning over, the slicing knife 9 is separated, and the slicing knife 9 is recycled. The obtained PBT slices 11 are packaged by the packaging vehicle 8 and transported to the warehouse to obtain PBT slices.

[0040] Example 2

[0041] Take PBT polyester, place it in a mixing tank, and heat it to a molten state to obtain a PBT melt; use the above-mentioned continuous feeding imitation memory PBT slicing device to inject the PBT melt into a mold groove with a specification of 2cm×3cm×0.5cm through the melt discharge pipe 1, use a "cross" slicing knife 9 to put it into the mold groove, and convey it into the cooling box 3 through the cooling conveyor belt 10. The temperature in the cooling box 3 is 30°C. The processing time in the cooling box 3 is 2h, and then the slicing knife 9 and the cooled and formed PBT slices 11 are poured out by turning over, the slicing knife 9 is separated, and the slicing knife 9 is recycled. The obtained PBT slices 11 are packaged by a packaging vehicle 8 and transported to a warehouse to obtain PBT slices.

[0042] Example 3

[0043] On the basis of Example 1, during the heating and melting process of PBT polyester, an inorganic modifier accounting for 5% by mass of PBT polyester was added thereto. The modifier was obtained by treating fluorite tailings at 60°C under a nitrogen protection atmosphere for 1 hour, and then sending it into a ball mill to pass through a 3000 mesh sieve. Other conditions were the same as in Example 1.

[0044] Example 4

[0045] On the basis of Example 3, the inorganic modifier accounts for 10% by mass of the PBT polyester, and the rest are the same as Example 3.

[0046] Example 5

[0047] On the basis of Example 3, the inorganic modifier accounts for 7% by mass of the PBT polyester, and the rest are the same as Example 3.

[0048] Example 6

[0049] On the basis of Example 3, the inorganic modifier accounts for 9% by mass of the PBT polyester, and the rest are the same as Example 3.

[0050] Example 7

[0051] On the basis of Example 3, the inorganic modifier is prepared by mixing fluorite tailings with ammonium sulfate solution having a mass concentration of 1% in a mass ratio of 1:10, letting it stand for 30 minutes, treating it at a temperature of 60°C for 1 hour under a nitrogen atmosphere, sending it into a ball mill to pass through a 3000 mesh sieve, and baking it at 60°C until the moisture content is less than 1%; the rest is the same as Example 3.

[0052] Example 8

[0053] On the basis of Example 3, the inorganic modifier is prepared by mixing fluorite tailings with a 10% ammonium sulfate solution in a mass ratio of 1:15, letting it stand for 30 minutes, treating it at 60°C for 1 hour under a nitrogen atmosphere, sending it into a ball mill to pass through a 3000 mesh sieve, and baking it at 60°C until the moisture content is less than 1%; the rest is the same as Example 3.

[0054] Example 9

[0055] On the basis of Example 3, the inorganic modifier is prepared by mixing fluorite tailings with a 7% ammonium sulfate solution in a mass ratio of 1:11, letting it stand for 30 minutes, treating it at 60°C for 1 hour under a nitrogen atmosphere, sending it into a ball mill to pass through a 3000 mesh sieve, and baking it at 60°C until the moisture content is less than 1%; the rest is the same as Example 3.

[0056] Example 10

[0057] On the basis of Example 3, the inorganic modifier is prepared by mixing fluorite tailings with ammonium sulfate solution having a mass concentration of 1% in a mass ratio of 1:12, letting it stand for 30 minutes, treating it at a temperature of 60°C for 1 hour under a nitrogen atmosphere, and then sending it into a ball mill to pass through a 3000 mesh sieve. The rest is the same as in Example 3.

[0058] The PBT chips obtained in Examples 1-10 were melt-spun using a screw extruder to produce simulated memory fibers. The melt spinning temperature was 280°C, the spinning speed was 2000 m / min, and the fibers were cooled using an annular airflow at a temperature of 20°C. After cooling and solidification, the simulated memory fibers were obtained. The breaking strength, elongation at break, tensile elastic recovery, and moisture regain of the resulting simulated memory fibers were tested. The results are shown in Table 1 below.

[0059] Table 1 Performance test of imitation memory fiber

[0060]

[0061] As can be seen from Table 1, the present invention is created by adding an inorganic modifier during the melt processing of PBT polyester, and the inorganic modifier is prepared after being treated with fluorite tailings and ammonium sulfate solution. It will help to improve the performance of PBT slices for preparing into imitation memory fibers, so that both the breaking strength and the elongation at break are optimized, and the tensile elastic recovery rate can be guaranteed to a great extent, so that the tensile elastic recovery rate reaches more than 96%, which greatly improves the comprehensive performance of PBT slices for preparing into imitation memory fiber materials.

[0062] At the same time, the present invention creates a method of placing the slicing knife 9 in a molten state of PBT, thereby avoiding the need to sharpen the cutting edge of the slicing knife 9 and also avoiding the need to apply pressure to the top of the slicing knife 9, thereby greatly reducing the energy consumption of the slicing process, reducing the cost of the PBT slicing process, and simplifying the PBT slicing process.

[0063] Other matters not covered in the present invention may be implemented with reference to the existing technology or common knowledge and conventional technical means known to those skilled in the art. For example, how to prepare PBT polyester materials can be prepared with reference to the existing technology. The PBT polyester used in the present invention is a PBT polyester material purchased directly from the market. The material is prepared using terephthalic acid, 1,4-butanediol, and polytetrahydrofuran as raw materials. Therefore, those skilled in the art may also refer to the monomer preparation-condensation synthesis process used in the existing technology for the preparation of PBT resin materials. Terms such as "left" and "right" mentioned in the present invention are described in terms of the orientation facing the accompanying drawings. In the present invention, each device needs to be supported by a support column 6 (such as Figure 2 As shown), those skilled in the art can install the support column 6 according to common knowledge and conventional technical means.

[0064] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A continuous feeding imitation memory PBT slice production process, characterized in that: The following steps are involved: S1: heating the PBT polyester to a molten state to obtain a PBT melt; S2: Using a continuous feeding imitation memory PBT slicing device, the PBT melt is injected into the mold - a slicing knife is placed - cooled and shaped - turned over and ejected from the mold - the slicing knife is separated - and packaged; The cooling and shaping is performed at a temperature of 20-30° C. for at least 2 hours; The continuously feeding imitation memory PBT slice device comprises a cooling conveyor belt (10), wherein a driving wheel (5) is provided at the left end of the cooling conveyor belt (10), a driven wheel (4) is provided at the right end of the cooling conveyor belt (10), and a sorting conveyor belt (7) is provided directly below the driven wheel (4); a driven wheel (4) is provided at the left end of the sorting conveyor belt (7), and a driving wheel (5) is provided at the right end of the sorting conveyor belt (7), and a packaging vehicle (8) is provided directly below the driving wheel (5) on the sorting conveyor belt (7); the driving wheel ( 5) A melt discharge pipe (1) is provided directly above the melt discharge pipe (1), and a knife box (2) is provided close to the melt discharge pipe (1) along the running direction of the cooling conveyor belt (10), wherein a plurality of slicing knives (9) are placed in the knife box (2); a cooling box (3) is provided behind the knife box (2), and the cooling conveyor belt (10) passes through the cooling box (3); a plurality of mold grooves are fixedly provided on the cooling conveyor belt (10), and the melt discharge pipe (1) can inject the PBT melt into the mold grooves, and the slicing knives (9) can just enter the mold grooves; The transport speed of the cooling conveyor belt (10) is such that the transport time in the cooling box (3) is at least 2 hours, and the temperature in the cooling box (3) is 20-30°C; The cooling conveyor belt (10) is formed by connecting a plurality of accommodation units (10.1) end to end, and two adjacent accommodation units (10.1) are connected by hinges (10.2); In step S1, an inorganic modifier accounting for 5-10% of the mass of the PBT polyester is added during the heating and melting process of the PBT polyester; The inorganic modifier is obtained by mixing fluorite tailings with ammonium sulfate solution with a mass concentration of 1-10% at a mass ratio of 1:10-15, leaving it to stand for 30 minutes, placing it in a nitrogen protection environment at a temperature of 50-60°C for 1 hour, and then sending it into a ball mill to pass through a 3000 mesh sieve.

2. The continuous feeding imitation memory PBT slice production process according to claim 1, characterized in that: The dimensions inside the accommodating unit (10.1) are 3 cm×3 cm×1 cm.

3. The continuous feeding imitation memory PBT slice production process according to claim 1, characterized in that: The slicing knife (9) is in the shape of a "one", "ten", "well", "king", "earth" or "stem".

4. The continuous feeding imitation memory PBT slice production process according to claim 1, characterized in that: The mass ratio of the fluorite tailings to the ammonium sulfate solution is 1:11, and the mass concentration of the ammonium sulfate solution is 3%.

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