Preparation method of biodegradable hot melt adhesive

Abstract

The invention discloses a preparation method of a biodegradable hot melt adhesive. The granulation equipment in the step S3 comprises a communicating pipe, a reaction kettle connected with the communicating pipe, a plurality of extrusion openings connected to the bottom end of the communicating pipe, a cleaning mechanism arranged outside the extrusion openings, a washing tank arranged at the bottom of the cleaning mechanism and a guide mechanism arranged in the washing tank; the cleaning mechanism comprises heating sleeves attached to the exteriors of the multiple extrusion openings, outer sleeves arranged at the bottom ends of the extrusion openings correspondingly, supporting rods fixedly connected between every two adjacent outer sleeves, first supporting shafts movably connected to the outer sides of the outer sleeves at the two ends, and first double-connecting-rod sets movably connected to the exteriors of the first supporting shafts. The preparation method of the biodegradable hot melt adhesive disclosed by the invention has the effect of reducing the loss of the adhesive while reducing the operation difficulty.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to a method for preparing a biodegradable hot melt adhesive. Background Art

[0002] Hot melt adhesive is a plastic adhesive. Within a certain temperature range, its physical state changes with temperature, while its chemical properties remain unchanged. It is non-toxic and odorless and is an environmentally friendly chemical product.

[0003] In the production process of hot melt adhesive, after being mixed in the reactor, it will be extruded and diverted through the extrusion port, and the extruded adhesive strip will enter the water of the washing tank for cooling, and one end of the extruded adhesive strip will be connected to the cutting equipment to achieve the granulation of the hot melt adhesive. Before each granulation, it is necessary to manually control the fire to heat the outside of the extrusion port, and squeeze the adhesive blocked in the extrusion port into the washing tank during the extrusion process. Most of the newly extruded adhesive will not be formed when entering the washing tank. Under this operation, the method of extruding the adhesive by extrusion will increase the waste of adhesive and increase cost expenditure. Summary of the invention

[0004] The invention discloses a method for preparing a biodegradable hot melt adhesive, aiming to solve the technical problem that the method of extruding the adhesive by extrusion will increase the waste of the adhesive and increase the cost expenditure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for preparing a biodegradable hot melt adhesive comprises the following specific steps: S1: raw material preparation: mixing a degradable starch resin, a latex polymer, a plasticizer, a stabilizer, a waterproofing agent, a water retaining agent, and a defoaming agent in a certain proportion; S2: raw material mixing: feeding the raw materials into a device for stirring and mixing, melting during the stirring process, so that each component is evenly dispersed;

[0007] S3: Extrusion: use granulation equipment to extrude the mixed adhesive; S4: Cooling: the extruded adhesive is cooled after passing through water, and the adhesive is pulled during the cooling process; S5: Cutting: use the cutting structure to cut the cooled adhesive into small sections; S6: Packaging and storage;

[0008] The ratio of the degradable starch resin, latex polymer, plasticizer, stabilizer, waterproofing agent, water-retaining agent and defoaming agent in S1 is 10:7:0.2:0.3:0.2:0.2:0.25, and the waterproofing agent is a silicone waterproofing agent, the water-retaining agent is a polyethylene oxide water-retaining agent, and the defoaming agent is an organic defoaming agent.

[0009] By using degradable starch resin instead of the resin in general hot melt adhesive, based on the excellent biodegradability of degradable starch resin, the environmental friendliness of the hot melt adhesive can be optimized. At the same time, based on the setting of waterproofing machine, water-retaining agent and defoaming agent, the defects of degradable starch resin can be compensated. Since the main body of degradable starch resin is starch, starch can absorb moisture in the air during long-term use, thereby affecting the adhesion of the glue. The water content of the glue is controlled by the water-retaining agent, and the setting of the waterproofing agent can form a barrier on the surface of the glue to prevent the contact between starch and air, thereby providing protection for the hot melt adhesive in long-term use. The setting of the defoaming agent can further prevent the glue from being damp, and at the same time, the bonding strength can be improved by reducing the formation of foam, thereby assisting the degradable starch resin to achieve better utilization effect.

[0010] In a preferred embodiment, the granulation equipment in S3 includes a connecting pipe, a reaction kettle connected to the connecting pipe, a plurality of extrusion ports connected to the bottom end of the connecting pipe, a cleaning mechanism disposed outside the plurality of extrusion ports, a water washing tank disposed at the bottom of the cleaning mechanism, and a guiding mechanism disposed in the water washing tank;

[0011] The cleaning mechanism includes a heating sleeve attached to the outside of the plurality of extrusion ports, outer sleeves respectively arranged at the bottom ends of the extrusion ports, a support rod fixedly connected between two adjacent outer sleeves, a first support shaft movably connected to the outside of the outer sleeves at both ends, a first double connecting rod group movably connected to the outside of the first support shaft, a motor connected to one end of the first connecting rod group, a first curved guide groove arranged outside the first support shaft, a longitudinal guide groove arranged outside the support rod, a support shell connected to one side of each outer sleeve, a clamping block movably connected to the support shell, an oblique groove penetrating through one side of the clamping block, a first plug-in frame movably inserted into the oblique groove, and a first gas rod fixed to the bottom end of the first plug-in frame;

[0012] The inner walls of the washing tank on both sides are fixedly connected with mounting seats, and the first curved guide groove is arranged on the mounting seat, one side of the mounting seat is fixedly connected with a supporting seat through a connecting plate, and a longitudinal guide groove is arranged on the supporting seat; the bottom ends of the two adjacent supporting shells are simultaneously connected with the bottom plate, and the first gas rod is fixedly connected to the bottom plate, the output end of the first gas rod is fixed to the bottom end of the first plug-in rack, each of the supporting shells is penetrated by a first through groove, and the first plug-in rack passes through the first through groove at the same time; the opposite sides of each of the supporting shells are penetrated by sliding grooves, the opposite sides of the clamping block are respectively fixedly connected with first sliders, and the first slider is movably connected in the sliding groove, the end of the supporting shell is fixedly connected with a back plate, and a spring is fixedly connected between the back plate and the first slider.

[0013] By providing a cleaning mechanism, the residual adhesive blocking the extrusion port position can be automatically cleaned through the setting of the cleaning mechanism. First, the heating sleeve is started to heat the adhesive at the extrusion port position. With continuous heating, the blocked part of the adhesive softens. With the rotation of the first motor, through the linkage action of the first double-link group and the limiting action of the longitudinal guide groove and the first curved guide groove, multiple outer sleeves can clamp the adhesive and move it in a path of first downward and then rotation. The blocked and softened adhesive can be pulled out through the downward and rotational pulling force, and the adhesive can be made to enter the water in the washing tank with a 90° rotation. Under this structure, the extrusion port can be automatically cleaned before formal production, which can reduce the difficulty of operation and the loss of adhesive.

[0014] In a preferred embodiment, the guiding mechanism comprises a linear guide rail fixed to the inner wall of the bottom end of the washing tank, a curved baffle movably connected to the linear guide rail, a plurality of second through grooves equidistantly arranged on the curved baffle and a second rack movably inserted in the second through grooves, the bottom end of the curved baffle is fixedly connected to a second slider, and the second slider moves on the linear guide rail, the second rack is fixedly connected to the second support shaft on the opposite sides, and one end of the second support shaft is movably connected to a hinge seat, a second gas rod is fixedly connected to the outer wall of one side of the hinge seat, and a side support plate is fixedly connected to one side of the second gas rod, a second curved guide groove is penetrated on the side support plate, and the second support shaft is movably connected in the second curved guide groove.

[0015] By providing a guiding mechanism, after cleaning is completed, as the curved baffle moves back along the linear guide rail, the adhesive is pushed to move toward the second rack. At this time, the second rack is in a horizontal state, so that the curved baffle can push the adhesive to the inside of the second rack, and then as the second gas rod is stretched, the second rack is driven to move obliquely. Therefore, when the curved baffle returns to its position, the floating adhesive can be blocked on one side by the second rack to avoid the cleaned adhesive from damaging the rubber strips in the subsequent granulation process. Under this structure, the curved baffle can also be used for repeated cleaning to reduce the frequency of manual cleaning of discarded adhesive.

[0016] As can be seen from the above, a method for preparing a biodegradable hot-melt adhesive, the granulation equipment in S3 includes a connecting pipe, a reactor connected to the connecting pipe, a plurality of extrusion ports connected to the bottom end of the connecting pipe, a cleaning mechanism arranged outside the plurality of extrusion ports, a water washing tank arranged at the bottom of the cleaning mechanism, and a guiding mechanism arranged in the water washing tank; the cleaning mechanism includes a heating sleeve attached to the outside of the plurality of extrusion ports, an outer sleeve respectively arranged at the bottom end of the extrusion ports, a support rod fixedly connected between two adjacent outer sleeves, a first support shaft movably connected to the outside of the outer sleeves at both ends, a first double connecting rod group movably connected to the outside of the first support shaft, a motor connected to one end of the first connecting rod group, a first curved guide groove arranged outside the first support shaft, a longitudinal guide groove arranged outside the support rod, a support shell connected to one side of each outer sleeve, a clamping block movably connected in the support shell, an inclined groove penetrating through one side of the clamping block, a first plug-in rack movably inserted in the inclined groove, and a first gas rod fixed to the bottom end of the first plug-in rack. The preparation method of the biodegradable hot-melt adhesive provided by the present invention has the technical effect of reducing the difficulty of operation and also reducing the loss of the adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention provides an overall flow chart of a method for preparing a biodegradable hot-melt adhesive.

[0018] Figure 2 The present invention is a schematic diagram of the structure of a granulation device for preparing a biodegradable hot-melt adhesive.

[0019] Figure 3 The present invention is a schematic diagram of the cleaning mechanism structure in a granulation device of a method for preparing a biodegradable hot-melt adhesive.

[0020] Figure 4 The present invention provides a schematic diagram of the disassembly of a cleaning mechanism in a granulation device in a method for preparing a biodegradable hot-melt adhesive.

[0021] Figure 5 The present invention provides a schematic diagram of a partial disassembly of a cleaning mechanism in a granulation device in a method for preparing a biodegradable hot-melt adhesive.

[0022] Figure 6 This is a schematic diagram of the disassembly of a guiding mechanism of a method for preparing a biodegradable hot-melt adhesive proposed by the present invention.

[0023] In the figure: 1, reactor; 2, connecting pipe; 3, cleaning mechanism; 4, washing tank; 5, guiding mechanism; 6, extrusion port; 301, heating sleeve; 302, motor; 303, mounting seat; 304, connecting plate; 305, outer sleeve; 306, support rod; 307, first plug-in rack; 308, first support shaft; 309, first double connecting rod group; 310, supporting shell; 311, first curved guide groove; 312, longitudinal guide groove; 313, supporting seat; 314 , clamping block; 315, inclined groove; 316, first slider; 317, spring; 318, slide groove; 319, first through groove; 320, back plate; 321, first gas rod; 322, bottom plate; 501, side support plate; 502, second curved guide groove; 503, second gas rod; 504, second support shaft; 505, second rack; 506, second through groove; 507, curved baffle; 508, second slider; 509, linear guide rail; 510, hinged seat. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] The invention discloses a method for preparing a biodegradable hot-melt adhesive, which is mainly used in the scenario of preparing a hot-melt adhesive.

[0026] Reference Figure 1 , a method for preparing a biodegradable hot melt adhesive, comprising the following specific steps:

[0027] S1: Raw material preparation: mix the degradable starch resin, latex polymer, plasticizer, stabilizer, waterproofing agent, water retaining agent and defoaming agent in a certain proportion;

[0028] S2: Raw material mixing: The raw materials are fed into the equipment for stirring and mixing, and melted during the stirring process to make the components evenly dispersed;

[0029] S3: Extrusion: Extruding the mixed adhesive using a granulation device;

[0030] S4: Cooling: The extruded adhesive is cooled after passing through water, and the adhesive is pulled during the cooling process;

[0031] S5: cutting: using the cutting structure to cut the cooled adhesive into small segments;

[0032] S6: packaging storage;

[0033] The ratio of degradable starch resin, latex polymer, plasticizer, stabilizer, waterproofing agent, water retaining agent and defoaming agent in S1 is 10:7:0.2:0.3:0.2:0.2:0.25, and the waterproofing agent is a silicone waterproofing agent, the water retaining agent is a polyethylene oxide water retaining agent, and the defoaming agent is an organic defoaming agent. By using degradable starch resin instead of the resin in the general hot melt adhesive, the environmental protection of the hot melt adhesive can be optimized based on the excellent biodegradability of the degradable starch resin. At the same time, based on the settings of the waterproofing agent, the water retaining agent and the defoaming agent, the degradable starch resin can be compensated. The defects of the resin are that the main body of the degradable starch resin is starch, and during long-term use, starch can absorb moisture in the air, which affects the adhesion of the glue. The water content of the glue can be controlled by the water-retaining agent, and the setting of the waterproofing agent can form a barrier on the surface of the glue to prevent the contact between starch and air, thereby providing protection for the hot melt adhesive under long-term use. The setting of the defoaming agent can further prevent the glue from getting damp, and at the same time improve the bonding strength by reducing the formation of foam, thereby helping the degradable starch resin to achieve better utilization effects.

[0034] Reference Figure 2-Figure 5 In a preferred embodiment, the granulation equipment in S3 includes a connecting pipe 2, a reaction kettle 1 connected to the connecting pipe 2, a plurality of extrusion ports 6 connected to the bottom end of the connecting pipe 2, a cleaning mechanism 3 disposed outside the plurality of extrusion ports 6, a water washing tank 4 disposed at the bottom of the cleaning mechanism 3, and a guiding mechanism 5 disposed in the water washing tank 4;

[0035] The cleaning mechanism 3 includes a heating sleeve 301 attached to the outside of multiple extrusion ports 6, outer sleeves 305 respectively arranged at the bottom ends of the extrusion ports 6, a support rod 306 fixedly connected between two adjacent outer sleeves 305, a first support shaft 308 movably connected to the outside of the outer sleeves 305 at both ends, a first double connecting rod group 309 movably connected to the outside of the first support shaft 308, a motor 302 connected to one end of the first connecting rod group 309, a first curved guide groove 311 arranged outside the first support shaft 308, a longitudinal guide groove 312 arranged outside the support rod 306, a support shell 310 connected to one side of each outer sleeve 305, a clamping block 314 movably connected in the support shell 310, an inclined groove 315 penetrating through one side of the clamping block 314, a first bracket 307 movably inserted in the inclined groove 315, and a first gas rod 321 fixed to the bottom end of the first bracket 307.

[0036] Reference Figure 3 and Figure 5 In a preferred embodiment, the inner walls on both sides of the washing tank 4 are fixedly connected with mounting seats 303, and the first curved guide groove 311 is arranged on the mounting seat 303, one side of the mounting seat 303 is fixedly connected with a supporting seat 313 through a connecting plate 304, and the longitudinal guide groove 312 is arranged on the supporting seat 313.

[0037] Reference Figure 3 and Figure 5 In a preferred embodiment, the bottom ends of two adjacent support shells 310 are simultaneously connected to a bottom plate 322, and a first gas rod 321 is fixedly connected to the bottom plate 322, an output end of the first gas rod 321 is fixed to the bottom end of the first rack 307, a first through slot 319 is penetrated through each support shell 310, and the first rack 307 simultaneously passes through the first through slot 319.

[0038] Reference Figure 3 and Figure 5 In a preferred embodiment, the opposite sides of each support shell 310 are respectively penetrated with a slide groove 318, the opposite sides of the clamping block 314 are respectively fixedly connected with a first slider 316, and the first slider 316 is movably connected in the slide groove 318, the end of the support shell 310 is fixedly connected with a back plate 320, and a spring 317 is fixedly connected between the back plate 320 and the first slider 316. The residual adhesive blocking the extrusion port 6 position can be automatically cleaned by the setting of the cleaning mechanism 3. First, the heating sleeve 301 is started to heat the adhesive at the extrusion port 6 position. At the same time, the first gas rod 321 drives the first rack 307 to fall vertically, pass through the first through slot 319 and contact the inclined slot 315. As the first rack 307 is continuously pressed downward, the clamping block 314 can be pushed forward to contact the outer sleeve 305. The inner wall on one side clamps the unheated solid adhesive extending from the bottom of the extrusion port 6, and as the heating continues, the blockage of the adhesive softens. As the first motor 302 rotates, through the linkage action of the first double-link group 309, and the limiting action of the longitudinal guide groove 312 and the first curved guide groove 311, multiple outer sleeves 305 can clamp the adhesive and move it in a path of first downward and then rotation. The blocked and softened adhesive can be pulled out through the downward and rotational pulling force, and with a 90° rotation, the adhesive enters the water in the washing tank 4. The outer sleeve 305 is released by the disengagement of the first bracket 307, so that the pulled adhesive falls into the washing tank 4. Under this structure, the extrusion port 6 can be automatically cleaned before formal production, which can reduce the difficulty of operation and the loss of adhesive.

[0039] Reference Figure 6 In a preferred embodiment, the guiding mechanism 5 includes a linear guide rail 509 fixed to the inner wall of the bottom end of the washing tank 4, a curved baffle plate 507 movably connected to the linear guide rail 509, a plurality of second through grooves 506 equidistantly arranged on the curved baffle plate 507, and a second rack 505 movably inserted into the second through grooves 506.

[0040] Reference Figure 6In a preferred embodiment, the bottom end of the arc baffle 507 is fixedly connected to a second slider 508, and the second slider 508 moves on a linear guide rail 509, and the second support shaft 504 is fixedly connected to the opposite sides of the second bracket 505, and one end of the second support shaft 504 is movably connected to a hinge seat 510.

[0041] Reference Figure 6 In a preferred embodiment, a second gas rod 503 is fixedly connected to an outer wall of one side of the hinge seat 510, and a side support plate 501 is fixedly connected to one side of the second gas rod 503, and a second curved guide groove 502 is penetrated on the side support plate 501, and the second support shaft 504 is movably connected to the second curved guide groove 502. When the cleaning mechanism 3 cleans the extrusion port 6, the adhesive falls into the washing tank 4 after the rotation of the outer sleeve 305, and is just blocked by the curved baffle 507. After the cleaning is completed, as the curved baffle 507 moves back along the linear guide rail 509, the adhesive is pushed to move toward the second rack 505. At this time, under the retracted state of the second gas rod 503 and the limiting effect of the second curved guide groove 502 , driving the second rack 505 to be in a horizontal state, thereby allowing the curved baffle 507 to push the adhesive to the inside of the second rack 505, and then with the stretching of the second gas rod 503, driving the second rack 505 to move obliquely, so that when the curved baffle 507 returns to its position, the floating adhesive can be blocked on one side by the second rack 505 to avoid the cleaned adhesive from damaging the rubber strips in the subsequent granulation process. Under this structure, the curved baffle 507 can also be used for repeated cleaning to reduce the frequency of manual cleaning of discarded adhesives. At the same time, based on the curved structure of the curved baffle 507 and the water flow guidance passing through the second through groove 506 during the movement, the adhesive can be accumulated in the middle position during the movement to ensure the thoroughness of the cleaning.

[0042] Working principle: The cleaning mechanism 3 can be used to automatically clean the adhesive remaining in the blockage at the extrusion port 6. First, the heating sleeve 301 is started to heat the adhesive at the extrusion port 6. At the same time, the first plug-in frame 307 is driven to fall vertically through the first gas rod 321, passing through the first through slot 319 and contacting the inclined slot 315. As the first plug-in frame 307 is continuously pressed downward, the clamping block 314 can be pushed forward to clamp the unheated solid adhesive extending from the bottom of the extrusion port 6 with the inner wall of one side of the outer sleeve 305. As the heating continues, the blockage of the adhesive softens. As the first motor 302 rotates, the first double Due to the linkage effect of the connecting rod group 309 and the limiting effect of the longitudinal guide groove 312 and the first curved guide groove 311, multiple outer sleeves 305 can clamp the adhesive and move in a path of first downward and then rotation. The blocked and softened adhesive can be pulled out through the downward and rotational pulling force, and the adhesive can enter the water in the washing tank 4 with a 90° rotation. The outer sleeve 305 is released by disengaging the first bracket 307, so that the pulled adhesive falls into the washing tank 4. Under this structure, the extrusion port 6 can be automatically cleaned before formal production, which can reduce the difficulty of operation and the loss of adhesive.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a biodegradable hot melt adhesive, characterized in that: The specific steps include: S1: Raw material preparation: mix the degradable starch resin, latex polymer, plasticizer, stabilizer, waterproofing agent, water retaining agent and defoaming agent in a certain proportion; S2: Raw material mixing: The raw materials are fed into the equipment for stirring and mixing, and melted during the stirring process to make the components evenly dispersed; S3: Extrusion: Extruding the mixed adhesive using a granulation device; S4: Cooling: The extruded adhesive is cooled after passing through water, and the adhesive is pulled during the cooling process; S5: cutting: using the cutting structure to cut the cooled adhesive into small segments; S6: packaging storage; The ratio of the degradable starch resin, latex polymer, plasticizer, stabilizer, waterproofing agent, water-retaining agent and defoaming agent in S1 is 10:7:0.2:0.3:0.2:0.2:0.25, and the waterproofing agent is a silicone waterproofing agent, the water-retaining agent is a polyethylene oxide water-retaining agent, and the defoaming agent is an organic defoaming agent.

2. The method for preparing a biodegradable hot melt adhesive according to claim 1, characterized in that: The granulation equipment in S3 comprises a connecting pipe (2), a reaction kettle (1) connected to the connecting pipe (2), a plurality of extrusion ports (6) connected to the bottom end of the connecting pipe (2), a cleaning mechanism (3) arranged outside the plurality of extrusion ports (6), a water washing tank (4) arranged at the bottom of the cleaning mechanism (3), and a guiding mechanism (5) arranged in the water washing tank (4); The cleaning mechanism (3) comprises a heating sleeve (301) attached to the outside of the plurality of extrusion ports (6), an outer sleeve (305) respectively arranged at the bottom end of the extrusion port (6), a support rod (306) fixedly connected between two adjacent outer sleeves (305), a first support shaft (308) movably connected to the outside of the outer sleeves (305) at both ends, a first double connecting rod group (309) movably connected to the outside of the first support shaft (308), a motor (302) connected to one end of the first connecting rod group (309), and a motor (306) arranged at the bottom of the plurality of extrusion ports (6). A first curved guide groove (311) outside the first support shaft (308), a longitudinal guide groove (312) arranged outside the support rod (306), a support shell (310) connected to one side of each outer sleeve (305), a clamping block (314) movably connected to the support shell (310), an inclined groove (315) penetrating through one side of the clamping block (314), a first plug-in frame (307) movably inserted into the inclined groove (315), and a first gas rod (321) fixed to the bottom end of the first plug-in frame (307).

3. The method for preparing a biodegradable hot melt adhesive according to claim 2, characterized in that: The inner walls of the washing tank (4) on opposite sides are respectively fixedly connected with mounting seats (303), and the first curved guide groove (311) is arranged on the mounting seat (303), one side of the mounting seat (303) is fixedly connected with a support seat (313) via a connecting plate (304), and the longitudinal guide groove (312) is arranged on the support seat (313).

4. The method for preparing a biodegradable hot melt adhesive according to claim 3, characterized in that: The bottom ends of two adjacent support shells (310) are simultaneously connected to a bottom plate (322), and a first gas rod (321) is fixedly connected to the bottom plate (322), an output end of the first gas rod (321) is fixed to the bottom end of the first plug-in rack (307), a first through slot (319) is penetrated through each of the support shells (310), and the first plug-in rack (307) simultaneously passes through the first through slot (319).

5. The method for preparing a biodegradable hot melt adhesive according to claim 4, characterized in that: A slide groove (318) is respectively provided on two opposite sides of each support shell (310), and first sliders (316) are respectively fixedly connected to the opposite sides of the clamping block (314), and the first slider (316) is movably connected in the slide groove (318), and a back plate (320) is fixedly connected to the end of the support shell (310), and a spring (317) is fixedly connected between the back plate (320) and the first slider (316).

6. The method for preparing a biodegradable hot melt adhesive according to claim 2, characterized in that: The guiding mechanism (5) comprises a linear guide rail (509) fixed to the inner wall of the bottom end of the washing tank (4), a curved baffle plate (507) movably connected to the linear guide rail (509), a plurality of second through grooves (506) equidistantly arranged on the curved baffle plate (507), and a second insertion frame (505) movably inserted into the second through grooves (506).

7. The method for preparing a biodegradable hot melt adhesive according to claim 6, characterized in that: The bottom end of the arc baffle (507) is fixedly connected to a second slider (508), and the second slider (508) moves on a linear guide rail (509); the second plug-in frame (505) is fixedly connected to two opposite sides of a second support shaft (504), and one end of the second support shaft (504) is movably connected to a hinge seat (510).

8. The method for preparing a biodegradable hot melt adhesive according to claim 7, characterized in that: A second gas rod (503) is fixedly connected to an outer wall of one side of the hinge seat (510), and a side support plate (501) is fixedly connected to one side of the second gas rod (503), a second curved guide groove (502) is penetrated through the side support plate (501), and a second support shaft (504) is movably connected in the second curved guide groove (502).

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