Preparation method of ecological degradable plastic film

Abstract

The invention relates to the technical field of plastic films, in particular to a preparation method of an ecological degradable plastic film. Comprising the following steps: S1, selecting degradable raw materials; s2, grinding and drying the selected degradable raw material to obtain a powdery material suitable for preparing a plastic film; s3, mixing the treated degradable material with an additive; s4, preparing the mixture into a plastic film through extrusion and calendering processes, so as to obtain an ideal ecological degradable plastic film; s5, performance testing is conducted on the prepared plastic film through a testing device, and the quality of the plastic film is evaluated; and S6, carrying out ecological degradation performance test on the prepared plastic film, and burying the plastic film into soil to observe the degradation condition of the plastic film. The degradable raw materials are starch, polylactic acid and polyethylene. The additives are a plasticizer and a stabilizer. The tensile strength and the elongation at break of the plastic can be tested through the testing device when the plastic film is prepared.

Description

Technical Field

[0001] This invention relates to the field of plastic film technology, and more specifically to a method for preparing eco-degradable plastic film. Background Technology

[0002] Degradable plastic film refers to the process by which plastic film decomposes into smaller compounds or harmless substances through biological or chemical processes in a natural environment. Currently, there are two commonly used types of degradable plastic film: biodegradable plastic film and biodegradable plastic film. The degradation rate and effectiveness of degradable plastic film are affected by environmental conditions, and different types of degradable plastic film will have different degradation rates in different environments. Therefore, when using degradable plastic film, it is necessary to select appropriate materials based on the specific application scenario and environmental conditions. In existing technologies, the tensile strength and elongation at break of the plastic film are not tested during its preparation. Since degradable plastic film contains many additives, these additives may affect the tensile strength of the film; therefore, testing the tensile strength and elongation at break of the plastic film is necessary. Summary of the Invention

[0003] This invention provides a method for preparing eco-degradable plastic film, the advantage of which is that the tensile strength and elongation at break of the plastic can be tested using a testing device during the preparation of the plastic film.

[0004] A method for preparing an eco-degradable plastic film includes the following steps:

[0005] S1: Select biodegradable raw materials;

[0006] S2: Grind and dry the selected biodegradable raw materials to obtain powdered materials suitable for preparing plastic films;

[0007] S3: Mix the treated biodegradable material with the additives;

[0008] S4: The mixture is prepared into a plastic film through extrusion and calendering processes to obtain an ideal eco-degradable plastic film;

[0009] S5: The prepared plastic film is subjected to performance testing using a testing device to evaluate the quality of the plastic film;

[0010] S6: Conduct an eco-degradability test on the prepared plastic film by burying it in the soil and observing its degradation.

[0011] The biodegradable raw materials are starch, polylactic acid, and polyethylene.

[0012] The additives are plasticizers and stabilizers.

[0013] In step S5, the tensile strength and elongation at break of the plastic film are tested using a testing device.

[0014] The aspect ratio of the plastic film is 5:1.

[0015] The soil moisture content in S6 is 20%-40%. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 A flowchart of a method for preparing an eco-degradable plastic film;

[0018] Figure 2 This is a flowchart of Example 1;

[0019] Figure 3 This is a flowchart of Example 2;

[0020] Figure 4 Schematic diagram of the testing device Figure 1 ;

[0021] Figure 5 Schematic diagram of the testing device Figure 2 ;

[0022] Figure 6 Schematic diagram of the testing device Figure 3 ;

[0023] Figure 7 Here is a schematic diagram of the H-frame structure;

[0024] Figure 8 This is a schematic diagram of the structure of the flat seat and the sliding seat;

[0025] Figure 9 This is a schematic diagram of the flat seat structure;

[0026] Figure 10 Schematic diagram of the block structure Figure 1 ;

[0027] Figure 11 Schematic diagram of the block structure Figure 2 .

[0028] In the diagram: H-frame 101; Hydraulic cylinder 102; Base 103; Ruler 104; Fixing block 105; Slider 106;

[0029] 201. Flat seat; 202. Bar; 203. Square column; 204. Elastic rod; 205. Middle seat; 206. Stop bar; 207. Actuating rod; 208. Sliding hole; 209. Hydraulic cylinder two; 210. Hydraulic cylinder three; 211. V-shaped slide groove;

[0030] Slide 301; Connecting post 302; Pressure plate 303; Pressure seat 304; Threaded post 305;

[0031] 401 upright block; 402 pressure seat; 403 pressure plate; 404 threaded column. Detailed Implementation

[0032] Example 1:

[0033] S1: Select biodegradable raw materials; biodegradable raw materials include starch, polylactic acid, and polyethylene;

[0034] S2: Grind and dry the selected biodegradable raw materials to obtain powdered materials suitable for preparing plastic films;

[0035] S3: Mix the treated biodegradable material with additives; the additives are plasticizers and stabilizers; the plasticizer is an aliphatic diester, and the stabilizer is lead stearate;

[0036] S4: The mixture is prepared into a plastic film through extrusion and calendering processes to obtain an ideal eco-degradable plastic film; the aspect ratio of the plastic film is 5:1;

[0037] S5: The prepared plastic film is subjected to performance tests using a testing device to evaluate its quality; the tensile strength and elongation at break of the plastic film are tested using the testing device.

[0038] S6: Conduct an eco-degradability test on the prepared plastic film by burying it in the soil and observing its degradation; the soil moisture content should be 20%.

[0039] Example 2:

[0040] S1: Select biodegradable raw materials; biodegradable raw materials include starch, polylactic acid, and polyethylene;

[0041] S2: Grind and dry the selected biodegradable raw materials to obtain powdered materials suitable for preparing plastic films;

[0042] S3: Mix the treated biodegradable material with additives; the additives are plasticizers and stabilizers; the plasticizer is an aliphatic diester, and the stabilizer is lead stearate;

[0043] S4: The mixture is prepared into a plastic film through extrusion and calendering processes to obtain an ideal eco-degradable plastic film; the aspect ratio of the plastic film is 5:1;

[0044] S5: The prepared plastic film is subjected to performance tests using a testing device to evaluate its quality; the tensile strength and elongation at break of the plastic film are tested using the testing device.

[0045] S6: Conduct an eco-degradability test on the prepared plastic film by burying it in the soil and observing its degradation; the soil moisture content should be 40%.

[0046] like Figure 7-9 As shown, this example can be used to test how much a plastic film will break after being stretched.

[0047] Since the testing device includes a base 103, an H-frame 101 is provided on the base 103, and flat seats 201 are slidably connected to both ends of the H-frame 101, the two ends of the plastic film can be fixed on the two flat seats 201 respectively. Then, the two flat seats 201 are driven to slide away from each other on the H-frame 101, thereby testing how much the plastic film breaks after being stretched, and thus indirectly calculating the tensile strength and elongation at break of the plastic film.

[0048] like Figure 7-9 As shown, this example demonstrates how to adapt to the narrowing effect of a stretched plastic film.

[0049] Because the upper side of the flat seat 201 is provided with a V-shaped groove 211, and both ends of the V-shaped groove 211 are slidably connected to the slide seat 301, and the lower side of the slide seat 301 is rotatably connected to multiple balls, the upper side of the slide seat 301 is connected to the pressure seat 304 through the connecting post 302, and two threaded posts 305 are welded to the upper side of the pressure seat 304. The pressure plate 303 is inserted into the two threaded posts 305, and nuts are threadedly connected to the threaded posts 305. During testing, the two corners of one end of the plastic film are respectively inserted into the corresponding threaded posts 305 on the two pressure seats 304 on the same side. Then, the pressure plate 303 is inserted into the corresponding threaded post 305, and a nut is installed on the threaded post 305 to press the pressure plate 303 onto the corresponding pressure seat 304. Then, the two flat seats 201 are driven to move away from each other. At this time, the pressure seats 304 on both sides will move away from each other, thereby stretching the plastic film. When the plastic film is stretched, the front and back width of the plastic film will become narrower. At this time, the two slide seats 301 on the same V-shaped slide groove 211 will slide and move closer to each other, thereby bringing the two pressure seats 304 on the same side closer to each other, thus adapting to the narrowing of the stretched plastic film.

[0050] like Figure 7-9 As shown, this example can achieve the effect of controlling the flat seat 201 to slide on the H frame 101.

[0051] Since both ends of the V-shaped slide groove 211 are welded with stop bars 206, and two hydraulic cylinders 102 are connected to the base 103 by screws, the movable ends of the two hydraulic cylinders 102 are respectively connected to the two flat seats 201 by screws. The extension and retraction of the hydraulic cylinders 102 can control the sliding of the flat seats 201 on the H-frame 101. The stop bars 206 at both ends of the V-shaped slide groove 211 can prevent the slide block 301 from sliding out of the V-shaped slide groove 211.

[0052] like Figure 7-11 As shown, this example can prevent the plastic film from shifting back and forth when it is stretched.

[0053] Since the flat seat 201 has a sliding hole 208 in the middle, the upright block 401 is slidably connected to the sliding hole 208. The upper end of the upright block 401 is welded with a pressure seat 2 402. Two threaded posts 2 404 are welded to the upper side of the pressure seat 2 402. The pressure plate 2 403 is inserted into the two threaded posts 2 404. Nuts are threaded onto the threaded posts 2 404. The lower side of the flat seat 201 is fixed with a hydraulic cylinder 2 209. The movable end of the hydraulic cylinder 2 209 is connected to the upright block 401 by screws. The middle of both ends of the plastic film needs to be inserted into the threaded posts 2 404 on the two pressure seats 2 402 respectively. Then, the pressure plate 2 403 is inserted into the corresponding threaded posts 2 404, thereby pressing the pressure plate 2 403 into the middle position of the end of the plastic film, thereby fixing the middle position of both ends of the plastic film and preventing the plastic film from shifting back and forth when it is stretched. When the hydraulic cylinder 209 extends or retracts, it can drive the upright block 401 to slide on the sliding hole 208, thereby changing the left and right positions of the pressure seat 2 402 and the pressure plate 2 403. When the slide seat 301 and the pressure seat 1 304 slide, it adapts to the changes in the left and right positions of the slide seat 301 and the pressure seat 1 304.

[0054] The outer side of the flat seat 201 is connected to the middle seat 205 by screws. The middle part of the square column 203 is welded to the middle seat 205. The front and rear ends of the square column 203 are slidably connected to the bar 202. The two bar 202 press on the inner side of the two pressure seats 304 respectively. Two elastic rods 204 are welded on the middle seat 205. The outer ends of the two elastic rods 204 are welded to the two bar 202 respectively.

[0055] like Figure 8-9 As shown, this example can achieve the effect of driving two pressure seats 304 to stretch the plastic back and forth.

[0056] The two elastic rods 204 on the square column 203 exert a force on the two bars 202 to move away from each other, so that the two bars 202 press on the two pressure seats 304 respectively, which in turn makes the two pressure seats 304 always tend to move away from each other, thereby driving the two pressure seats 304 to stretch the plastic back and forth, making the stretching more standard.

[0057] The front of the base 103 is connected to a ruler 104 by screws. The left and right ends of the ruler 104 are slidably connected to fixing blocks 105. Nuts are threaded onto the fixing blocks 105. The left and right ends of the ruler 104 are slidably connected to sliders 106. The two sliders 106 are located on the outside of the two fixing blocks 105 respectively. The lower front of the flat seat 201 is hinged to a toggle rod 207. The lower end of the toggle rod 207 is located between the corresponding fixing block 105 and slider 106. The lower side of the flat seat 201 is connected to a hydraulic cylinder 210 by screws. The movable end of the hydraulic cylinder 210 is fixed to the rear side of the toggle rod 207.

[0058] like Figure 4-11 As shown, this example can achieve the effect of determining how long the plastic film will be stretched before breaking based on the distance between the two sliders 106 and the two fixed blocks 105 respectively.

[0059] After fixing both ends of the plastic film to the upper sides of the two flat seats 201, drive the flat seats 201 to move away from each other to tighten the plastic film. Then slide the two fixing blocks 105 on the ruler 104 and place the two fixing blocks 105 against the inner sides of the two actuating levers 207. Then determine the starting position of the two flat seats 201 according to the scale of the ruler 104, and then drive the two flat seats 201 to move away from each other to stretch the plastic film. At this time, the plastic film is stretched until it breaks. As the two flat seats 201 move away from each other, the two actuating levers 207 will also move away from each other. Two levers 207 drive two sliders 106 to slide outward on the ruler 104. At this time, based on the distance between the two sliders 106 and the two fixed blocks 105, the length of time the plastic film will be stretched before breaking is determined, and the tensile strength and elongation at break of the plastic film can be indirectly calculated. When the plastic film breaks, the two hydraulic cylinders 210 push the two levers 207 to rotate forward, so that the two levers 207 move away from the inside of the two sliders 106. At this time, the two levers 207 will no longer move the two sliders 106.

Claims

1. A method for preparing an ecologically degradable plastic film, characterized by, The method comprises the following steps: S1: selecting degradable raw materials; S2: grinding and drying the selected degradable raw materials to obtain powder materials suitable for preparing plastic films; S3: mixing the treated degradable materials with additives; S4: preparing the mixture into a plastic film through an extrusion or calendering process to obtain an ideal eco-degradable plastic film; S5: testing the prepared plastic film through a testing device to evaluate the quality of the plastic film; S6: testing the eco-degradation performance of the prepared plastic film by burying the plastic film in soil to observe the degradation of the plastic film.

2. A process for the preparation of an ecologically degradable plastic film according to claim 1, characterized in that: The degradable raw materials are starch, polylactic acid and polyethylene.

3. A method of preparing an ecologically degradable plastic film according to claim 1, characterized in that: The additives are plasticizers and stabilizers.

4. A method of preparing an ecologically degradable plastic film according to claim 1, characterized in that: In S5, the tensile strength and elongation at break of the plastic film are tested through the testing device.

5. A method of preparing an ecologically degradable plastic film according to claim 1, characterized in that: The aspect ratio of the plastic film is 5:

1.

6. A method of preparing an ecologically degradable plastic film according to claim 1, characterized in that: In S6, the humidity of the soil is 20%-40%.

7. A method of preparing an ecologically degradable plastic film according to claim 1, characterized in that: The testing device comprises a base (103), an H-shaped frame (101) arranged on the base (103), and a left and right flat seat (201) slidably connected to the left and right ends of the H-shaped frame (101).

8. A method of preparing an ecologically degradable plastic film according to claim 7, characterized in that: The upper side of the flat seat (201) is provided with a V-shaped sliding groove (211), and the two ends of the V-shaped sliding groove (211) are slidably connected with sliding seats (301). The lower side of the sliding seat (301) is rotatably connected with a plurality of ball bearings, and the upper side of the sliding seat (301) is connected with a first pressing seat (304) through a connecting column (302). The upper side of the first pressing seat (304) is fixedly connected with two threaded columns (305), and a pressing plate (303) is inserted between the two threaded columns (305). The threaded columns (305) are threadedly connected with nuts.

9. A method of preparing an ecologically degradable plastic film according to claim 8, characterized in that: The two ends of the V-shaped sliding groove (211) are fixedly connected with stop rods (206), and two hydraulic cylinders (102) are fixedly arranged on the base (103). The movable ends of the two hydraulic cylinders (102) are fixedly connected with the two flat seats (201), respectively.

10. A process for the preparation of an ecologically degradable plastic film as claimed in claim 9, wherein: The middle part of the flat seat (201) is provided with a sliding hole (208), and a vertical block (401) is slidably connected with the sliding hole (208). The upper end of the vertical block (401) is fixedly connected with a second pressing seat (402). The upper side of the second pressing seat (402) is fixedly connected with two threaded columns (404), and a pressing plate (403) is inserted between the two threaded columns (404). The threaded columns (404) are threadedly connected with nuts. The lower side of the flat seat (201) is fixedly connected with a hydraulic cylinder (209), and the movable end of the hydraulic cylinder (209) is fixedly connected with the vertical block (401).

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