Preparation method of toughened polylactic acid blend and toughened polylactic acid blend

Abstract

The invention relates to the technical field of polylactic acid blends, in particular to a preparation method of a toughened polylactic acid blend and the toughened polylactic acid blend.The preparation method comprises the following steps that 1, polylactic acid particles and elastomer particles are mixed to obtain a particle raw material; 2, the particle raw materials are melted through an extruder to form fluid, the fluid is extruded into a pipe, and toughening wires are distributed in the pipe and are parallel to the axis of the pipe; and step 3, after the fluid in the pipe is cured into a solid material, fixing the pipe, the toughened wire and the solid material to obtain the toughened polylactic acid blend, thereby preventing the pipe as the shell from being completely broken.

Description

Technical Field

[0001] This invention relates to the field of polylactic acid blends, and more specifically to a method for preparing toughened polylactic acid blends and the toughened polylactic acid blends themselves. Background Technology

[0002] Polylactic acid (PLA) blends have a wide range of applications through modification. For example, increasing toughness can be used in fitness equipment to extend the lifespan of equipment subjected to frequent pressure and bending. For instance, a bar-shaped fitness device with added weight at both ends allows for frequent pushing and pulling of the bars to utilize the inertia of the added weight to train upper limb and core strength. However, the bar portion of this equipment requires frequent bending, and the combination of a heavy added structure and high-intensity use over a long period can easily damage it, leading to injuries during training. Another example is a hollow tubular fascia stretching device. The weight of the body pressing on this device compresses the tubular structure, making it prone to cracking or even breakage. In this case, the body loses support, increasing the risk of injury. Summary of the Invention

[0003] This invention provides a method for preparing a toughened polylactic acid blend and the toughened polylactic acid blend, which has the beneficial effect of being toughened and preventing breakage.

[0004] The above objectives are achieved through the following technical solutions:

[0005] A method for preparing a toughened polylactic acid blend includes the following steps:

[0006] Step 1: Mix polylactic acid granules with elastomer granules to obtain granular raw materials;

[0007] Step 2: The granular raw material is melted into a fluid by an extruder and extruded into a pipe. Toughening wires are distributed inside the pipe and are parallel to the axis of the pipe.

[0008] Step 3: The fluid inside the tube solidifies into a solid material to fix the tube, toughened wire, and solid material to obtain a toughened polylactic acid blend.

[0009] The above method is implemented using a polylactic acid blend processing device, which includes a support frame with a U-shaped structure. Two mirror-symmetrically arranged support rods are fixed to the bottom of the support frame. The axial direction of the support rods is the same as the extension direction of the support frame. When the pipe axis is placed on the two support rods parallel to the axis of the support rods, there is a gap between the pipe and the inner wall of the support frame. An air guide is provided at the bottom of the support frame, which is used to connect with the equipment that provides airflow for heat dissipation.

[0010] A toughened polylactic acid blend, processed using the above method, comprises a tube, with a convex wall of increased diameter fixed to the right end of the tube, toughening wires parallel to its own axis disposed on the inner wall of the tube, and the solid material fixed inside the tube. Attached Figure Description

[0011] Figure 1 A flowchart illustrating a method for preparing a toughened polylactic acid blend;

[0012] Figure 2 This is a schematic diagram of a polylactic acid (PLA) blend processing equipment and a toughened PLA blend.

[0013] Figure 3 A structural schematic diagram of the support frame, support rod, and air vent;

[0014] Figure 4 A partial structural schematic diagram of a toughened polylactic acid blend;

[0015] Figure 5 This is a structural diagram of the connector, heat sink, and insert.

[0016] Figure 6 This is a schematic diagram of the internal structure of the heat sink.

[0017] Figure 7 This is a schematic diagram of the protrusion structure;

[0018] Figure 8 This is a structural diagram of the frame, rollers, and first motor;

[0019] Figure 9 This is a structural diagram of the telescopic mechanism, the second motor, the patch, and the blade. Detailed Implementation

[0020] A method for preparing a toughened polylactic acid blend includes the following steps:

[0021] Step 1: Mix the granular polylactic acid and granular elastomer by physical stirring. The butadiene elastomer is acrylonitrile-butadiene-styrene, acrylonitrile-butadiene rubber, or acrylonitrile-butadiene-styrene-acrylate.

[0022] Step two is achieved using polylactic acid blend processing equipment, see reference. Figure 1 and 2The polylactic acid blend processing equipment includes a support frame 11, which is a U-shaped structure with an open top. Two mirror-symmetrically arranged support rods 12 are fixed to the bottom of the support frame 11. The axial direction of the support rods 12 is the same as the extension direction of the support frame 11. They are used to contact the bottom of the support tube 21 through two line contacts. When the tube 21 is placed on the two support rods 12 with the axis of the tube parallel to the axis of the support rod 12, there is a gap between the tube 21 and the inner wall of the support frame 11. The bottom of the support frame 11 is provided with an air guide 13, which is used to connect with the equipment that provides airflow for heat dissipation, such as a fan, so that there is a cold airflow in the support frame 11 to cool the tube 21. When the cold airflow contacts the tube 21 from bottom to top, it extends to the left and right, and there is also an upward airflow guided by the support frame 11 to wrap around the tube 21.

[0023] Combination Figure 5 The polylactic acid blend processing equipment also includes a connecting seat 31. A heat dissipation shell 32 is fixedly connected to the left end of the connecting seat 31, and an insertion tube 33 is fixedly connected to the left end of the heat dissipation shell 32. A fluid channel is provided at the axis of the connecting seat 31, the heat dissipation shell 32, and the insertion tube 33. The connecting seat 31 is used to be fixedly connected and connected to the extrusion head of the extruder, so that the granular raw material is melted by the extruder to form a fluid, which is then squeezed into the tube 21 through the fluid channel. Toughening wires 24 are distributed inside the tube 21. The toughening wires 24 are parallel to the axis of the tube 21. The insertion tube 33 is used to be inserted into the right end of the tube 21. Two water pipes are fixedly connected and connected to the upper and lower ends of the heat dissipation shell 32, respectively. One of the water pipes is connected to the pump body. The pump draws water from the pool and injects cooling water into the heat dissipation shell 32. After absorbing the heat of the heat dissipation shell 32, the cooling water is introduced into the pool through the other water pipe to dissipate heat, thereby connecting the heat dissipation shell 32 to form circulating water and reducing the impact of the extruder temperature on the tube 21.

[0024] Step 3: The fluid inside tube 21 is cooled and solidified into a solid material to fix tube 21, toughened wire 24 and solid material to obtain toughened polylactic acid blend.

[0025] The tube 21 can also be a double-layered structure with an inner and outer wall connected by a protruding structure, while maintaining axial communication between the outer and inner walls. This allows the tube 21 to have a hollow structure for inserting a detachable vibrator, thus enabling the tube 21 to function as a fascia massage device in conjunction with the vibrator. To build muscle tolerance, beginners can remove the vibrator from the tube 21. The toughening wire 24 is used to prevent the tube 21 from completely breaking when it reaches the end of its service life, which could cause injury to the user who is pressing on the tube 21.

[0026] The tube 21 is made of insulating material, preferably rubber.

[0027] The toughening wire 24 is a carbon fiber bundle, and the toughening wire 24 is attached to the inner wall of the tube 21. A convex wall 22 is integrally connected to the right end of the tube 21. The outer periphery of the convex wall 22 is provided with external threads, and the right end face of the convex wall 22 is provided with a groove 23 that connects with the inner wall, so that the right end face of the toughening wire 24 is located within the groove 23. (Note: The last sentence appears to be incomplete and possibly refers to a different context.) Figure 7 A block 34 is fixed to the left end of the heat sink 32. When the left end of the heat sink 32 abuts against the right end of the convex wall 22, the block 34 squeezes the toughened wire 24 into the groove 23.

[0028] To further explain, in combination Figure 8 and 9 A frame 41 is provided on the left side of the support frame 11. At least three rollers 42 are evenly distributed around the frame 41. The rollers 42 are rotatably connected to the frame 41. Each roller 42 is fixedly connected to the output shaft of a first motor 43. The first motor 43 is fixedly connected to the frame 41. The arrangement of the rollers 42 can be located on the outer side of the outer wall of the tube 21, so that the toughening wire 24 wound on the rollers 42 tilts when it is pulled into the tube 21. This tilt can make the toughening wire 24 adhere to the inner wall of the tube 21. That is, when the toughening wire 24 approaches the tube 21 from left to right, the distance between any two toughening wires 24 decreases.

[0029] To further explain, a telescopic mechanism 51 is fixedly connected to the frame 41. The movable end of the telescopic mechanism 51 is set to the right. A second motor 52 is fixedly connected to the movable end of the telescopic mechanism 51. A patch 53 is fixedly connected to the output shaft of the second motor 52. The patch 53 is used to cover the left end of the tube 21. A blade 54 is fixedly connected to the circumference of the patch 53. When the fluid solidifies, the second motor 52 rotates to drive the blade 54 to rotate and cut the toughened wire 24. On the other hand, the root of the patch 53 or the blade 54 abuts against the left end of the tube 21 to push the tube 21 so that the protrusion 34 is locked in the groove 23.

Claims

1. A method for preparing a toughened polylactic acid blend, characterized in that, Includes the following steps: Step 1: Mix polylactic acid granules with elastomer granules to obtain granular raw materials; Step 2: The granular raw material is melted by an extruder to form a fluid and extruded into the tube (21). Toughened wire (24) is distributed inside the tube (21) and the toughened wire (24) is parallel to the axis of the tube (21). Step 3: The fluid inside the tube (21) is solidified into a solid material to fix the tube (21), toughened wire (24) and solid material to obtain a toughened polylactic acid blend.

2. The method for preparing toughened polylactic acid blends according to claim 1, wherein the elastomer is a butadiene-based elastomer.

3. In the method for preparing the toughened polylactic acid blend according to claim 2, the butadiene elastomer is acrylonitrile-butadiene-styrene, acrylonitrile-butadiene rubber, or acrylonitrile-butadiene-styrene-acrylate.

4. The method for preparing toughened polylactic acid blends according to claim 1, wherein the tube (21) is an insulating material.

5. The method for preparing toughened polylactic acid blends according to claim 1, wherein the tube (21) is made of rubber.

6. The method for preparing toughened polylactic acid blends according to claim 1, wherein the toughened wire (24) is a carbon fiber bundle.

7. The method for preparing toughened polylactic acid blend according to claim 1, wherein the toughened wire (24) is bonded to the inner wall of the tube (21).

8. The method for preparing toughened polylactic acid blends according to claim 1 is implemented using a polylactic acid blend processing equipment, wherein the polylactic acid blend processing equipment includes a support frame (11), the support frame (11) is a U-shaped structure, and two mirror-symmetrically arranged support rods (12) are fixedly connected to the bottom of the support frame (11). The axial direction of the support rods (12) is the same as the extension direction of the support frame (11). When the axis of the tube (21) is parallel to the axis of the support rods (12) and placed on the two support rods (12), there is a gap between the tube (21) and the inner wall of the support frame (11). An air guide (13) is provided at the bottom of the support frame (11), and the air guide (13) is used to communicate with the equipment that provides airflow for heat dissipation.

9. The method for preparing toughened polylactic acid blends according to claim 8, wherein the polylactic acid blend processing equipment further includes a connecting seat (31), a heat sink (32) is fixedly connected to the left end of the connecting seat (31), an insert (33) is fixedly connected to the left end of the heat sink (32), and a fluid channel is provided at the axis of the connecting seat (31), the heat sink (32) and the insert (33), the connecting seat (31) is used to be fixedly connected and communicated with the extrusion head of the extruder, and the insert (33) is used to be inserted into the right end of the tube (21).

10. A toughened polylactic acid blend, characterized in that, The toughened polylactic acid blend is processed using the preparation method of any one of claims 1 to 9. The toughened polylactic acid blend includes a tube (21), a convex wall (22) with an increased diameter is fixed to the right end of the tube (21), a toughening wire (24) parallel to its own axis is provided on the inner wall of the tube (21), and the solid material is fixed inside the tube (21).

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