Ethanol-driven rapid bonding method for dissimilar materials

Abstract

The present application relates to the technical field of dissimilar material bonding methods, and relates to an ethanol-driven rapid bonding method for dissimilar materials. In order to solve the problem of low bonding speed when an existing adhesive is used for bonding dissimilar materials, the present application provides an ethanol-driven rapid bonding method for dissimilar materials. The method comprises: using a polylactic acid polyol as a raw material to prepare a polylactic acid composite adhesive layer sheet; soaking the obtained polylactic acid composite adhesive layer sheet in an ethanol solution to drive bonding; and laying the soaked polylactic acid composite adhesive layer sheet between dissimilar materials to be bonded, and applying a perpendicular pressure to a surface to be bonded until ethanol is completely volatilized, thereby completing bonding. By using ethanol to drive the rapid bonding performance of a polylactic acid composite adhesive layer, the present application not only easily achieves uniform and rapid adhesive application, but also achieves a bonding strength of 2 MPa or above under the action of a very small pressure. The method can be applied to dissimilar bonding of wood, bamboo, steel, glass, ceramic, etc., and has broad application prospects.

Description

Ethanol-driven rapid bonding method of dissimilar materials

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 2024113691961, filed on September 29, 2024, and entitled "Ethanol-driven rapid bonding method of dissimilar materials", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of dissimilar material bonding methods, and particularly relates to an ethanol-driven rapid bonding method of dissimilar materials. BACKGROUND

[0004] Dissimilar material bonding refers to the process of connecting two or more different materials into a whole through adhesive or other connection technology. These materials differ in chemical composition, metallographic structure, physical properties, or mechanical properties. Dissimilar material bonding technology is widely used in aerospace, automotive manufacturing, electronics and electrical appliances, medical devices, construction engineering, and other fields, and is of great significance for improving the overall performance of products, reducing weight, and reducing costs.

[0005] The commonly used methods for bonding dissimilar materials include adhesive bonding, welding, mechanical connection, etc. Among them, adhesive bonding is the most common method for bonding dissimilar materials. By selecting appropriate adhesives, a firm connection between materials can be achieved without damaging the properties of the base material.

[0006] However, the existing adhesives used for bonding dissimilar materials often have high viscosity, poor flowability, and are not easy to penetrate into the gaps of dissimilar materials, resulting in slow bonding speed. In addition, the way and uniformity of glue application can also affect the distribution and penetration effect of the adhesive, thereby affecting the bonding speed. SUMMARY

[0007] To solve the problem of slow bonding speed of existing adhesives for bonding dissimilar materials, the present application provides an ethanol-driven rapid bonding method of dissimilar materials.

[0008] Technical solution of the present application:

[0009] An ethanol-driven rapid bonding method of dissimilar materials, comprising the following steps:

[0010] Step one, preparing a polylactic acid composite glue layer sheet material from polylactic acid polyol as raw material;

[0011] Step two, immersing the polylactic acid composite glue layer sheet material obtained in step one in an ethanol solution to drive bonding;

[0012] Step three, the step two completed infiltration of polylactic acid composite adhesive layer sheet is laid between the dissimilar materials which need to be bonded, a certain vertical pressure is applied to the surface to be bonded until the ethanol volatilizes completely, that is, the bonding is completed.

[0013] Further, the preparation raw material of the polylactic acid composite adhesive layer sheet in step one includes polylactic acid polyol, isocyanate, anhydrous organic solvent, catalyst and chain extender; wherein the mass-volume ratio of polylactic acid polyol, isocyanate, anhydrous organic solvent and chain extender is 8-10g:1-3g:80-120ml:0.1-1.5g, the amount of the catalyst is 0.3% of the total mass of polylactic acid polyol and isocyanate.

[0014] Further, the polylactic acid polyol is one or a combination of several polylactic acid polyols with a molecular weight of 500-2000.

[0015] Further, the isocyanate is one or a combination of several of the following: polymethylene polyphenyl isocyanate, toluene diisocyanate, isophorone diisocyanate, diphenyl methane diisocyanate, dicyclohexyl methane diisocyanate, hexamethylene diisocyanate or lysine diisocyanate; the anhydrous organic solvent is one of butanone, dioxane, N,N-dimethylformamide or dimethylacetamide.

[0016] Further, the catalyst is a tin-based catalyst, specifically stannous octoate or stannous chloride; the chain extender is one or a combination of several of the following: sebacic dihydrazide, succinic dihydrazide, 2,5-bis(benzyloxy)terephthalic dihydrazide.

[0017] Further, the preparation method of the polylactic acid composite adhesive layer sheet is as follows: polylactic acid polyol, isocyanate and catalyst are placed in an inert atmosphere, and a prepolymer is obtained by reacting at a temperature of 70-90°C for 3-5h; anhydrous organic solvent and chain extender are added to the obtained prepolymer, the reaction temperature is reduced to room temperature, and the obtained composite system is continuously reacted in an inert atmosphere for 24-48h to obtain a composite system; the obtained composite system is poured into a mold, and after standing at room temperature, the anhydrous organic solvent in the composite system is volatilized and removed to obtain the polylactic acid composite adhesive layer sheet.

[0018] Further, the thickness of the obtained polylactic acid composite adhesive layer sheet is 0.02-2mm.

[0019] Further, the volume concentration of the ethanol solution in step two is 50-100%, and the infiltration time is 10-60s.

[0020] Further, the dissimilar materials in step three include wood, bamboo, iron, aluminum, copper, stainless steel, glass, ceramics, plastics and rubber.

[0021] Further, the pressure is not less than 5000Pa.

[0022] Advantages of the present application:

[0023] The bonding method provided by the present application uses a polylactic acid composite glue layer of a sheet as a bonding agent, and uses ethanol to drive the rapid bonding performance of the polylactic acid composite glue layer. The polylactic acid composite glue layer is laid between the heterogeneous materials to be bonded. The method not only facilitates uniform and rapid glue application, but also can achieve a bonding strength of more than 2 MPa under very small pressure. The ethanol-driven rapid bonding method of heterogeneous materials provided by the present application can be applied to the bonding of wood, bamboo, steel, glass, ceramics and other heterogeneous materials, and has a broad application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a comparison diagram of the bonding strength of the rapid bonding method in Examples 1-5 for bonding different heterogeneous materials;

[0025] FIG. 2 is a physical demonstration diagram of the bonding strength of the rapid bonding method provided in Example 1 for bonding bamboo and iron pieces. The dumbbell weight is 10 kg. DETAILED DESCRIPTION

[0026] The technical solutions of the present application are further described below in conjunction with the examples, but are not limited thereto. Any modification or equivalent replacement of the technical solutions of the present application without departing from the spirit and scope of the present application shall be covered in the protection scope of the present application. The process equipment or device not specifically mentioned in the following examples is the conventional equipment or device in the art. If not specifically mentioned, the raw materials used in the examples of the present application are commercially available. If not specifically mentioned, the technical means used in the examples of the present application is the conventional means known to those skilled in the art.

[0027] Example 1

[0028] The present example provides an ethanol-driven rapid bonding method of heterogeneous materials, comprising the following steps:

[0029] Step one, preparing a polylactic acid composite glue layer sheet using polylactic acid polyol as raw material;

[0030] First, 8.82 g of polylactic acid polyol PLA-OH was weighed in a four-necked flask connected with a vacuum pump, stirred to remove moisture, 1.03 g of IPDI was added, 0.3% of stannous octoate based on the total mass of polylactic acid polyol and isocyanate was added, nitrogen was introduced, and the reaction was carried out at 80°C for 3.5 h to obtain a prepolymer; 100 ml of butanone was added to the obtained prepolymer to reduce the viscosity of the reaction system, and after the system was cooled to room temperature 25°C, 0.11 g of IPDH was added for chain extension reaction, and nitrogen was introduced throughout the reaction for 12 h to obtain a composite system; the obtained composite system was poured into a mold, and after standing at room temperature for one night, it was sent into a 50°C oven for 24 h to volatilize and remove butanone in the composite system, thereby obtaining a polylactic acid composite adhesive layer sheet with a thickness of 0.2 mm.

[0031] Step two, the polylactic acid composite adhesive layer sheet obtained in step one was immersed in an ethanol solution with a volume concentration of 100% for 30 s to drive adhesion;

[0032] Step three, the polylactic acid composite adhesive layer sheet obtained in step two was laid between the bamboo sheet and the iron sheet, two different kinds of materials, and a vertical pressure of 5000 Pa was applied to the surface to be bonded until the ethanol was completely volatilized, thereby completing the bonding.

[0033] Example 2

[0034] The present embodiment provides an ethanol-driven rapid bonding method for dissimilar materials, which comprises the following steps:

[0035] Step one, preparing a polylactic acid composite adhesive layer sheet from polylactic acid polyol as raw material;

[0036] First, 8.82 g of polylactic acid polyol PLA-OH was weighed in a four-necked flask connected with a vacuum pump, stirred to remove moisture, 1.03 g of IPDI was added, 0.3% of stannous octoate based on the total mass of polylactic acid polyol and isocyanate was added, nitrogen was introduced, and the reaction was carried out at 80°C for 3.5 h to obtain a prepolymer; 100 ml of butanone was added to the obtained prepolymer to reduce the viscosity of the reaction system, and after the system was cooled to room temperature 25°C, 0.11 g of IPDH was added for chain extension reaction, and nitrogen was introduced throughout the reaction for 12 h to obtain a composite system; the obtained composite system was poured into a mold, and after standing at room temperature for one night, it was sent into a 50°C oven for 24 h to volatilize and remove butanone in the composite system, thereby obtaining a polylactic acid composite adhesive layer sheet with a thickness of 0.2 mm.

[0037] Step two, the polylactic acid composite adhesive layer sheet obtained in step one was immersed in an ethanol solution with a volume concentration of 100% for 30 s to drive adhesion;

[0038] Step three, the polylactic acid composite adhesive layer sheet prepared in step two is laid between the bamboo sheet and the glass sheet to be bonded, and a vertical pressure of 5000 Pa is applied to the surface to be bonded until the ethanol is completely volatilized, and the bonding is completed.

[0039] Example 3

[0040] The embodiment provides an ethanol-driven fast bonding method for dissimilar materials, which comprises the following steps:

[0041] Step one, a polylactic acid composite adhesive layer sheet is prepared by using polylactic acid polyol as raw material;

[0042] First, 8.82 g of polylactic acid polyol PLA-OH is weighed in a four-necked flask connected with a vacuum pump, and stirred to remove moisture, 1.03 g of IPDI is added, 0.3% of stannous octoate based on the total mass of polylactic acid polyol and isocyanate is added, nitrogen is introduced, and the reaction is carried out at 80°C for 3.5 h to obtain a prepolymer; 100 ml of butanone is added to the obtained prepolymer to reduce the viscosity of the reaction system, and after the system is reduced to room temperature 25°C, 0.11 g of IPDH is added for chain extension reaction, and nitrogen is introduced throughout the reaction for 12 h to obtain a composite system; the obtained composite system is poured into a mold, and after being placed at room temperature overnight, it is sent into a 50°C oven for 24 h to volatilize and remove butanone in the composite system, and a polylactic acid composite adhesive layer sheet with a thickness of 0.2 mm is obtained.

[0043] Step two, the polylactic acid composite adhesive layer sheet obtained in step one is immersed in an ethanol solution with a volume concentration of 100% for 30 s to drive bonding;

[0044] Step three, the polylactic acid composite adhesive layer sheet prepared in step two is laid between the bamboo sheet and the glass sheet to be bonded, and a vertical pressure of 5000 Pa is applied to the surface to be bonded until the ethanol is completely volatilized, and the bonding is completed.

[0045] Example 4

[0046] The embodiment provides an ethanol-driven fast bonding method for dissimilar materials, which comprises the following steps:

[0047] Step one, a polylactic acid composite adhesive layer sheet is prepared by using polylactic acid polyol as raw material;

[0048] First, 8.82 g of polylactic acid polyol PLA-OH was weighed in a four-necked flask connected with a vacuum pump, stirred to remove moisture, 1.03 g of IPDI was added, 0.3% of stannous octoate based on the total mass of polylactic acid polyol and isocyanate was added, nitrogen was introduced, and the reaction was carried out at 80°C for 3.5 h to obtain a prepolymer; 100 ml of butanone was added to the obtained prepolymer to reduce the viscosity of the reaction system, and after the system was cooled to room temperature 25°C, 0.11 g of IPDH was added for chain extension reaction, and nitrogen was introduced throughout the reaction for 12 h to obtain a composite system; the obtained composite system was poured into a mold, and after standing at room temperature overnight, it was sent into a 50°C oven for 24 h to volatilize and remove butanone in the composite system, thereby obtaining a polylactic acid composite adhesive layer sheet with a thickness of 0.2 mm.

[0049] Step two, the polylactic acid composite adhesive layer sheet obtained in step one was immersed in an ethanol solution with a volume concentration of 100% for 30 s to drive adhesion;

[0050] Step three, the polylactic acid composite adhesive layer sheet obtained in step two was laid between the bamboo sheets and stainless steel of two different materials to be bonded, and a vertical pressure of 5000 Pa was applied to the bonding surface until the ethanol was completely volatilized, thereby completing the bonding.

[0051] Example 5

[0052] The embodiment provides an ethanol-driven rapid bonding method for dissimilar materials, which comprises the following steps:

[0053] Step one, preparing a polylactic acid composite adhesive layer sheet from polylactic acid polyol as raw material;

[0054] First, 8.82 g of polylactic acid polyol PLA-OH was weighed in a four-necked flask connected with a vacuum pump, stirred to remove moisture, 1.03 g of IPDI was added, 0.3% of stannous octoate based on the total mass of polylactic acid polyol and isocyanate was added, nitrogen was introduced, and the reaction was carried out at 80°C for 3.5 h to obtain a prepolymer; 100 ml of butanone was added to the obtained prepolymer to reduce the viscosity of the reaction system, and after the system was cooled to room temperature 25°C, 0.11 g of IPDH was added for chain extension reaction, and nitrogen was introduced throughout the reaction for 12 h to obtain a composite system; the obtained composite system was poured into a mold, and after standing at room temperature overnight, it was sent into a 50°C oven for 24 h to volatilize and remove butanone in the composite system, thereby obtaining a polylactic acid composite adhesive layer sheet with a thickness of 0.2 mm.

[0055] Step two, the polylactic acid composite adhesive layer sheet obtained in step one was immersed in an ethanol solution with a volume concentration of 100% for 30 s to drive adhesion;

[0056] Step three, the polylactic acid composite adhesive layer sheet prepared in step two is laid between the bamboo and wood pieces of two different kinds of materials to be bonded, and a vertical pressure of 5000 Pa is applied to the surface to be bonded until the ethanol is completely volatilized, and the bonding is completed.

[0057] Figure 1 is a comparison chart of the bonding strength of the rapid bonding method in Examples 1-5 for bonding different kinds of materials, which shows that the bonding strength of the two different kinds of materials of bamboo and iron pieces in Example 1 is 6.4±1.2 MPa; the bonding strength of the two different kinds of materials of bamboo and ceramic pieces in Example 2 is 6.3±1.6 MPa; the bonding strength of the two different kinds of materials of bamboo and glass pieces in Example 3 is 2.6±0.7 MPa; the bonding strength of the two different kinds of materials of bamboo and stainless steel pieces in Example 4 is 5.3±1.2 MPa; and the bonding strength of the two different kinds of materials of bamboo and wood pieces in Example 5 is 11.8±1.1 MPa. It can be proved that the ethanol-driven rapid bonding method for different kinds of materials provided by the present application has good bonding effect for different kinds of materials, and the bonding strength can be as high as 11.8 MPa.

Claims

1. An ethanol-driven rapid bonding method of dissimilar materials, characterized by, It comprises the following steps: Step one, preparing the polylactic acid composite adhesive layer sheet material with polylactic acid polyol as raw material; Step two, soaking the polylactic acid composite adhesive layer sheet material obtained in step one in ethanol solution to drive adhesion; Step three, laying the polylactic acid composite adhesive layer sheet material obtained in step two between the dissimilar materials to be adhered, and applying a certain vertical pressure to the surface to be adhered until the ethanol volatilizes completely, and the adhesion is completed.

2. The method of claim 1, wherein the method is performed at room temperature. The preparation raw material of the polylactic acid composite adhesive layer sheet material in step one comprises polylactic acid polyol, isocyanate, anhydrous organic solvent, catalyst and chain extender; the mass-volume ratio of polylactic acid polyol, isocyanate, anhydrous organic solvent and chain extender is 8-10g:1-3g:80-120ml:0.1-1.5g, and the amount of the catalyst is 0.3% of the total mass of polylactic acid polyol and isocyanate.

3. The method of claim 2, wherein the ethanol is applied at a temperature of from about 20°C to about 25°C. The polylactic acid polyol is one or a combination of several polylactic acid polyols with a molecular weight of 500-2000.

4. The method of claim 3, wherein the ethanol is applied at a temperature of from about 20°C to about 25°C. The isocyanate is one or a combination of several poly-methylene polyphenyl isocyanate, toluene diisocyanate, isophorone diisocyanate, diphenyl methane diisocyanate, dicyclohexyl methane diisocyanate, hexamethylene diisocyanate or lysine diisocyanate; and the anhydrous organic solvent is one of butanone, dioxane, N,N-dimethylformamide or dimethylacetamide.

5. The method of claim 4, wherein the ethanol is applied at a temperature of from about 20°C to about 25°C. The catalyst is a tin-based catalyst, specifically stannous octoate or stannous chloride; and the chain extender is one or a combination of several decanedihydrazide, succinic acid dihydrazide and 2,5-bis(benzyloxy)terephthalic dihydrazide.

6. The method of claim 1-5, wherein the method is a rapid ethanol-driven bonding method of dissimilar materials. The preparation method of the polylactic acid composite adhesive layer sheet material is as follows: polylactic acid polyol, isocyanate and catalyst are placed in an inert atmosphere and reacted at a temperature of 70-90°C for 3-5h to obtain a prepolymer; anhydrous organic solvent and chain extender are added to the obtained prepolymer, the reaction temperature is lowered to room temperature, and the obtained composite system is continuously reacted in an inert atmosphere for 24-48h to obtain a composite system; the obtained composite system is poured into a mold, and the anhydrous organic solvent in the composite system is volatilized and removed after the composite system is left at room temperature, and the polylactic acid composite adhesive layer sheet material is obtained.

7. The method of claim 6, wherein the ethanol is applied at a temperature of about 20°C to about 25°C. The thickness of the obtained polylactic acid composite adhesive layer sheet material is 0.02-2mm.

8. The method of claim 7, wherein the ethanol is applied at a temperature of about 20°C to about 25°C. The volume concentration of the ethanol solution in step two is 50-100%, and the soaking time is 10-60s.

9. The method of claim 8, wherein the ethanol is applied at a temperature of from about 20°C to about 25°C. The dissimilar materials in step three include wood, bamboo, iron, aluminum, copper, stainless steel, glass, ceramic, plastic and rubber.

10. The method of claim 9, wherein the ethanol is applied at a temperature of about 20°C to about 25°C. The pressure is not less than 5000Pa.

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