Polyurethane moisture-curing hot melt adhesive, preparation method and application

Abstract

The present invention relates to the technical field of hot melt adhesives, and discloses a polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof, wherein the polyurethane moisture-curing hot melt adhesive, the preparation method and the application thereof, comprises the following components in parts by weight: 10 to 45 parts of polyester polyol, 10 to 35 parts of polyether polyol, 20 to 40 parts of isocyanate compound, 4 to 6 parts of resin, 0.3 to 1 part of catalyst, 0.3 to 2 parts of defoamer, and 0.5 to 2 parts of wetting and leveling agent. The polyurethane moisture-curing hot melt adhesive, the preparation method and the application thereof, by using amorphous and highly crystalline polyester polyols and polyether polyols to synthesize the moisture-curing hot melt adhesive, not only has excellent wettability to substrates with low polarity, but also has a high initial adhesion strength. At the same time, by adjusting the amount of epoxy resin or thermoplastic resin used, it can cope with the lamination of substrates of different thicknesses, and the introduction of these resins can not only increase the initial adhesion but also improve the physical properties of the glue, effectively improving the performance of the hot melt adhesive.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesives, and in particular to a polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof. Background Art

[0002] A jacket is a functional outdoor garment. In its production process, hot melt adhesive can play an important role. The fabric of a jacket is usually waterproof and windproof, but if the seams are not properly treated, moisture and cold wind can easily penetrate through the gaps. Hot melt adhesive can form a sealing layer at the seams to ensure the waterproofness and windproofness of the jacket. This sealing treatment can effectively prevent the invasion of rain, snow and cold wind, keeping the body dry and warm. Since jackets are mainly used in outdoor environments and are often exposed to rain and moisture, the selected hot melt adhesive must have good water resistance. It is necessary to ensure that the hot melt adhesive does not lose its viscosity in a humid environment, thereby ensuring the jacket is waterproof and windproof. The waterproof performance of the jacket, the outdoor environment changes in various ways, factors such as temperature, humidity, and ultraviolet rays will affect the performance of the hot melt adhesive. Choosing a hot melt adhesive with good weather resistance can ensure that the jacket can maintain good performance under different environmental conditions. As people's awareness of environmental protection increases, choosing environmentally friendly hot melt adhesive is becoming more and more important. Environmentally friendly hot melt adhesive does not contain harmful substances, is harmless to the human body and the environment, and meets the requirements of sustainable development. The viscosity and strength of the hot melt adhesive directly affect the quality and service life of the jacket. Choosing a hot melt adhesive with strong viscosity and high strength can ensure that all parts of the jacket are firmly bonded together, and it is not easy to have problems such as debonding and falling off.

[0003] The current hot melt adhesive has poor initial adhesion performance, and the connection between the hot melt adhesive and the product is easy to fall off. Other operating steps and additives are also needed to ensure the stability of the connection between the hot melt adhesive and the product. The wettability of the substrate with low polarity is poor, which makes the product's moisture permeability poor, affecting the comfort of the product. In addition, the hot melt adhesive is relatively soft in nature, which makes the clothing product feel soft after use, and the product is not upright, which cannot meet the actual use needs well. Summary of the invention

[0004] In view of the fact that the above-mentioned existing hot melt adhesive has poor initial adhesion performance, the connection between the hot melt adhesive and the product is easy to fall off, and the wettability to the substrate with low polarity is poor, which makes the product's moisture permeability function poor, affecting the comfort of product use, and the hot melt adhesive is soft in nature, which makes the clothing product feel soft after use, the product is not upright, and cannot well meet the actual use needs, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof, and the purpose is to: by using amorphous and highly crystalline polyester polyols and polyether polyols to synthesize a moisture-curing hot melt adhesive, not only has excellent wettability to substrates with low polarity, but also has a high initial adhesion strength, and at the same time, by adjusting the amount of epoxy resin or thermoplastic resin to cope with the bonding of substrates of different thicknesses, and the introduction of these resins can not only increase the initial adhesion but also improve the physical properties of the glue, effectively improving the performance of the hot melt adhesive.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof, comprising the following components in parts by weight:

[0007] 10-45 parts of polyester polyol, 10-35 parts of polyether polyol, 20-40 parts of isocyanate compound, 4-6 parts of resin, 0.3-1 parts of catalyst, 0.3-2 parts of defoaming agent, and 0.5-2 parts of wetting and leveling agent.

[0008] As a preferred embodiment of the present invention, the polyester polyol is an aliphatic or aromatic polyol.

[0009] As a preferred embodiment of the present invention, the polyester polyol is synthesized by vacuum condensation of diols, triols, aliphatic diols, aromatic dibasic acids and anhydrides.

[0010] As a preferred solution of the present invention, the resin is any one of epoxy resin or thermoplastic acrylic resin.

[0011] As a preferred solution described in the present invention, it includes: a collecting bin, a quantitative component arranged on the top of the collecting bin, and a mixing component arranged in the inner cavity of the collecting bin.

[0012] As a preferred solution described in the present invention, the quantitative component includes five groups of quantitative cylinders arranged above the collecting bin, five groups of mounting base plates arranged on the top of the collecting bin, and the mounting base plates are located below the quantitative cylinders, a connecting port arranged on the top of the mounting base plates, and the connecting port passes through the mounting base plates, a feeding pipe arranged at the bottom of the quantitative cylinder, and the bottom end of the feeding pipe passes through the connecting port and is connected to the inner cavity of the collecting bin, a control valve arranged on the surface of the feeding pipe, and a fixing component arranged on the quantitative cylinder.

[0013] As a preferred solution described in the present invention, the fixing component includes a blocking disk arranged in the inner cavity of the metering cylinder, a feed pipe arranged on the top of the blocking disk and the feed pipe passes through the blocking disk, and a quantitative scale arranged on the surface of the metering cylinder.

[0014] As a preferred solution described in the present invention, the fixing assembly further comprises a threaded rod arranged on one side of the top of the mounting base plate, a positioning rod arranged on the side of the top of the mounting base plate away from the threaded rod, a triangular mounting seat arranged on the top of the threaded rod and the positioning rod, and the triangular mounting seat and the top of the quantitative cylinder are connected to each other, an internally threaded sleeve block arranged on the surface of the threaded rod, a sleeve block arranged on the surface of the positioning rod, an inverted U-shaped connecting rod arranged on the internally threaded sleeve block and one end of the top of the sleeve block, and one end of the inverted U-shaped connecting rod extends to the inner cavity of the quantitative cylinder and is connected to the top of the blocking disk, a connecting ring arranged on the surface of the quantitative cylinder, and the surfaces of the connecting ring are respectively connected to the internally threaded sleeve block and one end of the sleeve block, and an annular handle sleeve arranged at the bottom end of the surface of the threaded rod.

[0015] As a preferred scheme described in the present invention, the mixing component includes a mixing bin arranged at the bottom of the collecting bin, a first rotating rod arranged at one side of the inner cavity of the collecting bin, and both ends of the first rotating rod extend to the outside of the collecting bin, a motor arranged at one side of the collecting bin, and the output end of the motor and the end of the first rotating rod located outside the collecting bin are connected to each other, a first spiral blade arranged on the surface of the first rotating rod and located in the inner cavity of the collecting bin, a connecting pipe arranged at one side of the bottom of the collecting bin, and the bottom end of the connecting pipe and one side of the top of the mixing bin are connected to each other, the connecting pipe and the collecting bin and the inner cavity of the mixing bin are connected to each other, a feeding port arranged at one side of the bottom of the mixing bin, a second rotating rod arranged at one side of the inner cavity of the mixing bin, and one end of the second rotating rod extends to the outside of the mixing bin, a second spiral blade arranged on the surface of the second rotating rod and located in the inner cavity of the mixing bin, pulleys arranged at one end of the second rotating rod located outside the mixing bin and at one end of the first rotating rod located outside the collecting bin, and a transmission belt arranged on the surfaces of two groups of the pulleys.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention uses a moisture-curing hot melt adhesive synthesized by using amorphous and highly crystalline polyester polyols in combination with polyether polyols. The hot melt adhesive not only has excellent wettability to substrates with low polarity, but also has high initial adhesion strength. At the same time, the amount of epoxy resin or thermoplastic resin used is adjusted to cope with the bonding of substrates of different thicknesses. The introduction of these resins can not only increase the initial adhesion but also improve the physical properties of the glue, effectively improve the performance of the hot melt adhesive, and make the application range of the hot melt adhesive wider. The hot melt adhesive has an ultra-hard feel and excellent moisture permeability, and can be better applied to products such as jackets.

[0018] 2. The present invention can accurately measure each raw material by coordinating multiple groups of quantitative cylinders and fixed components, and can ensure that the input amount of each raw material meets the requirements of the formula, thereby improving the preparation accuracy of the modified moisture-permeable adhesive and ensuring product quality and performance. The quantitative raw material operation makes the input of raw materials more orderly and controllable, which helps to optimize the preparation process. The input sequence and time can be reasonably arranged according to the properties of the raw materials and reaction conditions, thereby improving the preparation efficiency and product quality. By recording the input amount of each group of quantitative cylinders, the use of raw materials can be easily traced, thereby performing quality control, which is also of great significance for ensuring the consistency and stability of the product.

[0019] 3. The present invention, through the provision of the first spiral blade and the second spiral blade in the inner cavity of the collecting bin and the mixing bin, can transfer and mix multiple groups of quantitatively input raw materials, which helps to simplify the preparation process, facilitate subsequent preparation operations, and reduce the waiting time in the preparation process, thereby improving the preparation efficiency. The efficient mixing operation can ensure that the raw materials are evenly mixed in a short time, shortening the preparation cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the polyurethane moisture-curing hot melt adhesive, its preparation method and its application according to the present invention.

[0022] Figure 2 It is a schematic diagram of the overall structure of the polyurethane moisture-curing hot melt adhesive, preparation method and application from another perspective of the present invention.

[0023] Figure 3 The present invention is a schematic diagram of a cross-sectional three-dimensional structure of the polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof.

[0024] Figure 4 The three-dimensional structural schematic diagram of the polyurethane moisture-curing hot melt adhesive, the preparation method and the application of the metering cylinder of the present invention.

[0025] Figure 5 The present invention is a schematic diagram of a partially cutaway three-dimensional structure of a metering cylinder of the polyurethane moisture-curing hot melt adhesive, a preparation method and an application thereof.

[0026] Figure 6 The diagram is a three-dimensional structural diagram of the fixing components of the polyurethane moisture-curing hot melt adhesive, the preparation method and the application thereof of the present invention.

[0027] Explanation of the reference numerals: 1. Collecting bin; 2. Dosing component; 21. Dosing cylinder; 22. Feeding pipe; 23. Control valve; 24. Mounting base; 25. Connecting port; 26. Dosing scale; 27. Fixing assembly; 271. Blocking disc; 272. Feeding pipe; 273. Threaded rod; 274. Internally threaded sleeve; 275. Positioning rod; 276. Sleeve; 277. Connecting collar; 278. Triangular mounting seat; 279. Inverted U-shaped connecting rod; 270. Annular handle; 3. Mixing component; 31. Motor; 32. First rotating rod; 33. First spiral blade; 34. Second rotating rod; 35. Second spiral blade; 36. Feeding port; 37. Connecting pipe; 38. Pulley; 39. Transmission belt; 30. Mixing bin. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Example 1: This is the first example of the present invention, which provides a polyurethane moisture-curing hot melt adhesive. The polyurethane moisture-curing hot melt adhesive includes the following components in parts by weight: 10 parts of polyester polyol, 10 parts of polyether polyol, 20 parts of isocyanate compound, 4 parts of resin, 0.3 parts of catalyst, 0.3 parts of defoaming agent, and 0.5 parts of wetting and leveling agent.

[0031] Polyester polyols are aliphatic and aromatic polyols.

[0032] Polyester polyols are synthesized by vacuum condensation of diols, triols, aliphatic diols, aromatic dibasic acids and anhydrides.

[0033] The resin is either epoxy resin or thermoplastic acrylic resin.

[0034] Embodiment 2: This is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it includes the following components in parts by weight: 45 parts of polyester polyol, 35 parts of polyether polyol, 40 parts of isocyanate compound, 6 parts of resin, 1 part of catalyst, 2 parts of defoaming agent, and 2 parts of wetting and leveling agent.

[0035] Polyester polyols are aliphatic and aromatic polyols.

[0036] Polyester polyols are synthesized by vacuum condensation of diols, triols, aliphatic diols, aromatic dibasic acids and anhydrides.

[0037] The resin is either epoxy resin or thermoplastic acrylic resin.

[0038] The remaining structures are the same as those of Example 1.

[0039] Example 3: This is the third example of the present invention. This example is different from the second example in that it includes the following components in parts by weight: 28 parts of polyester polyol, 23 parts of polyether polyol, 30 parts of isocyanate compound, 5 parts of resin, 0.6 parts of catalyst, 1 part of defoaming agent, and 1.2 parts of wetting and leveling agent.

[0040] Polyester polyols are aliphatic and aromatic polyols.

[0041] Polyester polyols are synthesized by vacuum condensation of diols, triols, aliphatic diols, aromatic dibasic acids and anhydrides.

[0042] The resin is either epoxy resin or thermoplastic acrylic resin.

[0043] The operating principle of the present invention is described as follows: the moisture-curing hot melt adhesive synthesized by using amorphous and highly crystalline polyester polyols and polyether polyols in the formula not only has excellent wettability to substrates with low polarity, but also has a high initial adhesion strength. At the same time, the amount of epoxy resin or thermoplastic resin is adjusted to cope with the bonding of substrates of different thicknesses. Moreover, the introduction of these resins can not only increase the initial adhesion but also improve the physical properties of the glue, effectively improve the use performance of the hot melt adhesive, make the application range of the hot melt adhesive wider, and have an ultra-hard feel and excellent moisture permeability, and can be better used in products such as assault jackets.

[0044] The remaining structure is the same as that of Example 2.

[0045] Example 4: Reference Figure 1-6 , which is the fourth embodiment of the present invention, provides: a method for preparing a polyurethane moisture-curing hot melt adhesive, comprising a collecting bin 1, a quantitative component 2 disposed on the top of the collecting bin 1, and a mixing component 3 disposed in the inner cavity of the collecting bin 1;

[0046] The quantitative component 2 includes five groups of quantitative cylinders 21 arranged above the collecting bin 1, five groups of mounting base plates 24 fixedly mounted on the top of the collecting bin 1, and the mounting base plates 24 are located below the quantitative cylinders 21, a connecting port 25 is started at the top of the mounting base plates 24, and the connecting port 25 penetrates the mounting base plates 24, a feeding pipe 22 is installed at the bottom of the quantitative cylinder 21, and the bottom end of the feeding pipe 22 penetrates the connecting port 25 and is connected to the inner cavity of the collecting bin 1, a control valve 23 is arranged on the surface of the feeding pipe 22, and a fixed component 27 is arranged on the quantitative cylinder 21.

[0047] The fixed component 27 includes a blocking disk 271 slidably connected to the inner cavity of the quantitative cylinder 21 , a feed pipe 272 installed on the top of the blocking disk 271 and the feed pipe 272 passes through the blocking disk 271 , and a quantitative scale 26 arranged on the surface of the quantitative cylinder 21 .

[0048] The fixing assembly 27 also includes a threaded rod 273 rotatably connected to one side of the top of the mounting base plate 24, a positioning rod 275 fixedly mounted on the top of the mounting base plate 24 away from the threaded rod 273, the positioning rod 275 plays a stabilizing role when the blocking plate 271 moves up or down, a triangular mounting seat 278 rotatably connected to the threaded rod 273 and the top of the positioning rod 275, and the triangular mounting seat 278 and the top of the quantitative cylinder 21 are connected to each other, an internally threaded sleeve block 274 threadedly sleeved on the surface of the threaded rod 273, a sleeve block 276 slidably sleeved on the surface of the positioning rod 275, an inverted U-shaped connecting rod 279 mounted on one end of the internally threaded sleeve block 274 and the top of the sleeve block 276, and the inverted U One end of the connecting rod 279 extends to the inner cavity of the metering cylinder 21 and is connected to the top of the blocking disk 271. A connecting ring 277 is slidably mounted on the surface of the metering cylinder 21, and the surfaces of the connecting ring 277 are respectively connected to one end of the internal threaded sleeve 274 and the sleeve 276. The internal threaded sleeve 274 and the sleeve 276 can be connected by the connecting ring 277 so that they can rise or fall synchronously. At the same time, the connecting ring 277 can correspond to the quantitative scale 26 on the metering cylinder 21, which is convenient for the operator to observe and accurately position the operation. The annular handle 270 is fixedly mounted on the bottom end of the surface of the threaded rod 273, which is convenient for the operator to rotate the threaded rod 273 for operation.

[0049] The mixing component 3 includes a mixing chamber 30 fixedly mounted at the bottom of the collecting chamber 1, a first rotating rod 32 rotatably connected to one side of the inner cavity of the collecting chamber 1, and both ends of the first rotating rod 32 extend to the outside of the collecting chamber 1, a motor 31 fixedly mounted on one side of the collecting chamber 1, and the output end of the motor 31 and one end of the first rotating rod 32 located outside the collecting chamber 1 are connected to each other, a first spiral blade 33 fixedly sleeved on the surface of the first rotating rod 32 and located in the inner cavity of the collecting chamber 1, and a connecting pipe 37 installed on one side of the bottom of the collecting chamber 1, and the bottom end of the connecting pipe 37 and one side of the top of the mixing chamber 30 are connected to each other. The connecting pipe 37 is connected to the inner cavities of the collecting bin 1 and the mixing bin 30, and a discharge port 36 is installed on one side of the bottom of the mixing bin 30, so as to facilitate a second rotating rod 34 rotatably connected to one side of the inner cavity of the mixing bin 30, and one end of the second rotating rod 34 extends to the outside of the mixing bin 30, a second spiral blade 35 is fixedly sleeved on the surface of the second rotating rod 34 and located in the inner cavity of the mixing bin 30, a pulley 38 is fixedly sleeved on one end of the second rotating rod 34 located outside the mixing bin 30 and one end of the first rotating rod 32 located outside the collecting bin 1, and a transmission belt 39 is slidably sleeved on the surface of the two sets of pulleys 38.

[0050] During use, when it is necessary to prepare a breathable adhesive, the multiple groups of quantitative cylinders 21 on the top of the collection bin 1 can be adjusted in advance according to the amount of polyester polyol, polyether polyol, isocyanate compound, resin, catalyst, defoamer, and wetting and leveling agent added. First, the annular handle 270 on the bottom plate 24 can be rotatably installed to drive the threaded rod 273 to rotate, and then the internal threaded sleeve 274 can be driven to move on the surface of the threaded rod 273. Subsequently, the internal threaded sleeve 274 and the sleeve 276 are connected by the connecting sleeve 277, and then the sleeve 276 is synchronously driven to slide on the surface of the positioning rod 275. When the connecting sleeve 277 slides up and down on the surface of the metering cylinder 21, the connecting sleeve 277 can move on the surface of the quantitative scale 26, and then the connecting sleeve 277 is moved to the corresponding quantitative scale 26 position according to the amount of raw materials, so that the internal threaded sleeve 274 and the inverted U-shaped connecting rod 279 on the sleeve 276 can adjust the height of the blocking disk 271 in the inner cavity of the metering cylinder 21, so that the amount that can be accommodated in the metering cylinder 21 is consistent with the required amount, and then multiple groups of metering cylinders 21 are adjusted to the same amount of required raw materials, and then the raw materials can be poured into the metering cylinder 21 from the feeding pipe 272;

[0051] Then the control valve 23 under the metering cylinder 21 can be opened to allow the raw materials in the metering cylinder 21 to enter the inner cavity of the collecting bin 1 through the discharge pipe 22, and then the motor 31 can be started to drive the first rotating rod 32 to rotate, and then the first spiral blade 33 can be rotated in the inner cavity of the collecting bin 1 to push multiple groups of different raw materials in the metering cylinder 21, and then fall into the inner cavity of the mixing bin 30 through the connecting pipe 37. At the same time, the pulley 38 and the transmission belt 39 cooperate with each other to synchronously drive the second rotating rod 34 to rotate, and then the second spiral blade 35 in the inner cavity of the mixing bin 30 can be rotated, and then multiple groups of raw materials can be mixed and transported, and finally discharged from the discharge port 36 on the mixing bin 30, and then subsequent manufacturing processing can be carried out.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A polyurethane moisture curing hot melt adhesive characterized by: The composition comprises the following components in parts by weight: 10-45 parts of polyester polyol, 10-35 parts of polyether polyol, 20-40 parts of isocyanate compound, 4-6 parts of resin, 0.3-1 parts of catalyst, 0.3-2 parts of defoaming agent, and 0.5-2 parts of wetting and leveling agent.

2. The polyurethane moisture curing hot melt adhesive, preparation method and application according to claim 1, characterized in that: The polyester polyols are aliphatic and aromatic polyols.

3. The polyurethane moisture curing hot melt adhesive, preparation method and application according to claim 2, characterized in that: The polyester polyol is synthesized by vacuum polycondensation of diol, triol, aliphatic diol, aromatic dibasic acid and acid anhydride.

4. The polyurethane moisture curing hot melt adhesive, preparation method and application according to claim 3, characterized in that: The resin is any one of epoxy resin and thermoplastic acrylic resin.

5. A method for preparing a polyurethane moisture-curing hot melt adhesive, which is applied to the polyurethane moisture-curing hot melt adhesive described in claim 4, characterized in that: It comprises a collecting chamber (1), a quantitative component (2) arranged on the top of the collecting chamber (1), and a mixing component (3) arranged in the inner cavity of the collecting chamber (1).

6. The method for preparing a polyurethane moisture-curing hot melt adhesive according to claim 5, characterized in that: The quantitative component (2) comprises five groups of quantitative cylinders (21) arranged above the collecting bin (1), five groups of mounting base plates (24) arranged on the top of the collecting bin (1), wherein the mounting base plates (24) are located below the quantitative cylinders (21), a connecting port (25) arranged on the top of the mounting base plates (24), wherein the connecting port (25) penetrates the mounting base plates (24), a feeding tube (22) arranged at the bottom of the quantitative cylinder (21), wherein the bottom end of the feeding tube (22) penetrates the connecting port (25) and is in communication with the inner cavity of the collecting bin (1), a control valve (23) arranged on the surface of the feeding tube (22), and a fixing component (27) arranged on the quantitative cylinder (21).

7. The method for preparing a polyurethane moisture-curing hot melt adhesive according to claim 6, characterized in that: The fixing assembly (27) comprises a blocking disk (271) arranged in the inner cavity of the metering cylinder (21), a feeding tube (272) arranged on the top of the blocking disk (271), the feeding tube (272) passing through the blocking disk (271), and a quantitative scale (26) arranged on the surface of the metering cylinder (21).

8. The method for preparing a polyurethane moisture-curing hot melt adhesive according to claim 7, characterized in that: The fixing assembly (27) further comprises a threaded rod (273) disposed on one side of the top of the mounting base plate (24), a positioning rod (275) disposed on a side of the top of the mounting base plate (24) away from the threaded rod (273), a triangular mounting seat (278) disposed on the top of the threaded rod (273) and the positioning rod (275), wherein the triangular mounting seat (278) and the top of the metering cylinder (21) are connected to each other, an internally threaded sleeve block (274) disposed on the surface of the threaded rod (273), and a sleeve block (275) disposed on the surface of the positioning rod (275). 276), an inverted U-shaped connecting rod (279) arranged at one end of the top of the internally threaded sleeve (274) and the sleeve (276), and one end of the inverted U-shaped connecting rod (279) extends to the inner cavity of the metering cylinder (21) and is connected to the top of the blocking disk (271), a connecting ring (277) arranged on the surface of the metering cylinder (21), and the surface of the connecting ring (277) is respectively connected to one end of the internally threaded sleeve (274) and the sleeve (276), and an annular handle (270) is arranged at the bottom end of the surface of the threaded rod (273).

9. The method for preparing a polyurethane moisture-curing hot melt adhesive according to claim 8, characterized in that: The mixing component (3) comprises a mixing chamber (30) arranged at the bottom of the collecting chamber (1), a first rotating rod (32) arranged at one side of the inner cavity of the collecting chamber (1), and the two ends of the first rotating rod (32) extend to the outside of the collecting chamber (1), a motor (31) arranged at one side of the collecting chamber (1), and the output end of the motor (31) and the end of the first rotating rod (32) located outside the collecting chamber (1) are connected to each other, a first spiral blade (33) arranged on the surface of the first rotating rod (32) and located in the inner cavity of the collecting chamber (1), and a connecting pipe (37) arranged at one side of the bottom of the collecting chamber (1), and the bottom end of the connecting pipe (37) and one side of the top of the mixing chamber (30) are connected to each other. The connecting pipe (37) is connected to the inner cavities of the collecting bin (1) and the mixing bin (30); a feed port (36) is arranged on one side of the bottom of the mixing bin (30); a second rotating rod (34) is arranged on one side of the inner cavity of the mixing bin (30), and one end of the second rotating rod (34) extends to the outside of the mixing bin (30); a second spiral blade (35) is arranged on the surface of the second rotating rod (34) and located in the inner cavity of the mixing bin (30); a pulley (38) is arranged on one end of the second rotating rod (34) located outside the mixing bin (30) and one end of the first rotating rod (32) located outside the collecting bin (1); and a transmission belt (39) is arranged on the surfaces of the two groups of pulleys (38).

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