High-strength environment-friendly water-based reversible binder and preparation method thereof

Abstract

The invention discloses a high-strength environment-friendly water-based reversible binder and a preparation method, and belongs to the technical field of binders, and the high-strength environment-friendly water-based reversible binder is prepared by adding a certain amount of organic acid and alcohol substances into deionized water according to a certain proportion and uniformly stirring. The invention aims to solve the problems of complex preparation method, high cost, complex components, difficult degradation of part of materials, easy environmental pollution, long time for realizing bonding and low adhesion strength of the existing organic silicon adhesive. The required raw materials are low in cost, the preparation method is simple, and large-scale production is easy. The reversible binder provided by the invention is green and environment-friendly, does not pollute the environment and has no pungent smell. Through verification, the reversible binder provided by the invention has shorter bonding time than the prior art, has higher adhesion strength through a tensile test, and can realize reversible adhesion on various material surfaces (ceramic, metal, wood, glass, plastic and the like).

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to a high-strength, environmentally friendly, water-based reversible adhesive and its preparation method. Background Technology

[0002] Adhesives (also known as binders) are functional substances that can tightly bind different materials together through surface adhesion and cohesion. However, traditional adhesives (such as solvent-based products like benzene and esters) release large amounts of volatile organic compounds (VOCs) during production and use, leading to air pollution, toxic residues, and poor biodegradability. They are also often accompanied by a pungent odor, posing a serious threat to the environment and human health. Furthermore, their irreversibility results in a series of application limitations, such as difficult recycling, significant resource waste, high manufacturing and maintenance costs, and restrictions on sustainable development. Reversible adhesives, on the other hand, are one of the key technologies for achieving a circular economy, green manufacturing, and intelligent maintenance. They solve not only the problem of "adhesion" but also the challenge of "disassembly." Offering unprecedented flexibility in product design, resource recycling, and specialized processes, it is widely used in electronics and smart manufacturing (such as temporary component mounting and testing, screen bonding), the automotive industry (NVH components, temporary protective films, removable panels), packaging and consumer goods (recyclable packaging, reusable packaging), biomedicine (removable dressings, temporary fixation of medical devices), and construction and building materials (temporary positioning of prefabricated components, installation of display building materials). Therefore, developing adhesives that combine reversible bonding properties with environmental friendliness has become a key path to overcoming industry bottlenecks.

[0003] While the reversible silicone adhesive disclosed in the patent (solvent-free, reversible, easy-to-clean moisture-adhesive silicone adhesive and its preparation method, CN117625120A) can achieve reversible adhesion, its preparation method is relatively complex and costly. Furthermore, it contains sulfur and recalcitrant materials, posing significant risks to human health and the environment. In addition, it requires a long time to achieve adhesion and exhibits low bond strength. Summary of the Invention

[0004] This invention discloses a high-strength, environmentally friendly, water-based reversible adhesive and its preparation method. A novel, high-strength, environmentally friendly, water-based reversible adhesive is directly prepared by adding a certain amount of organic acid and alcohol to deionized water in a specific ratio using a one-pot method. The aim is to address the problems of existing organosilicon adhesive preparation methods, which are complex, costly, have complex compositions, contain some non-degradable materials, easily cause environmental pollution, require long bonding times, and have low adhesion strength.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A high-strength, environmentally friendly, water-based reversible adhesive is made by uniformly mixing deionized water, organic acid, and alcohol in a mass ratio of 10~50:20~70:20~70.

[0006] Preferably, the organic acid is one or a combination of tannic acid, tartaric acid, citric acid, malic acid, lactic acid, oxalic acid, and succinic acid.

[0007] Preferably, the alcohol is one or a combination of xylitol, sorbitol, mannitol, glucose, sucrose, fructose, and maltose.

[0008] A method for preparing a high-strength, environmentally friendly, water-based reversible adhesive includes the following steps: first, organic acids and alcohols are mixed in a certain mass ratio, and then added to a certain mass ratio of deionized water. The mixture is stirred at 95 ℃ until a homogeneous solution is formed, thus obtaining the high-strength, environmentally friendly, water-based reversible adhesive.

[0009] The beneficial effects of this invention, a high-strength, environmentally friendly water-based reversible adhesive and its preparation method, are as follows: 1. The prepared reversible adhesive does not pollute the environment, is biodegradable, has no pungent odor, is relatively safe for users, and is unlikely to cause allergies. 2. The preparation method is simple, requiring only a one-pot process. 3. The prepared reversible adhesive can bond to various substrates such as ceramics, metals, wood, glass, and plastics, and can achieve non-destructive debonding through heating. 4. The prepared reversible adhesive has high adhesion strength. 5. The raw material cost is low, making it easy to mass-produce. 6. The bonding time of the reversible adhesive is shorter than that of current technologies. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the reversible bonding of a reversible adhesive. Figure 2 Adhesion strength diagrams of the reversible adhesives provided in Examples 1, 2, and 3; Figure 3 The adhesion strength diagrams of the reversible adhesive provided in Example 3 on different substrates are shown. Figure 4 The adhesion strength diagrams are for Comparative Example 1 and Comparative Example 2. Detailed Implementation

[0011] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0012] The following embodiments can be understood as illustrating a part of the local structure or method of the present invention, or as combining the embodiments to explain the broader structure or method of the present invention.

[0013] Example 1: Weigh 5g of tartaric acid and 5g of sorbitol, disperse them in 4g of deionized water, and then stir the mixture at 95℃ to dissolve it evenly. After cooling to room temperature, the desired reversible adhesive is obtained.

[0014] Use a pipette or sterile syringe to transfer approximately 60 μL of the reversible adhesive described above and apply it between the surfaces of the materials to be bonded, ensuring full contact between the reversible adhesive and the materials. The coating area should be 1 cm × 1 cm. After drying and curing, the bonding materials will achieve effective adhesion.

[0015] The adhesion strength of the reversible adhesive was tested using a universal testing machine (ETM504C). Figure 2 As shown in the figure, this reversible adhesive exhibits ideal adhesion strength (higher than existing technologies), indicating its potential as an excellent reversible adhesive.

[0016] Example 2: Weigh 5g of tannic acid and 5g of fructose, disperse them in 4g of deionized water, and then stir the mixture at 95℃ to dissolve it evenly. After cooling to room temperature, the desired reversible adhesive is obtained.

[0017] Use a pipette or sterile syringe to transfer approximately 60 μL of the reversible adhesive described above and apply it between the surfaces of the materials to be bonded, ensuring full contact between the reversible adhesive and the materials. The coating area should be 1 cm × 1 cm. After drying and curing, the bonding materials will achieve effective adhesion.

[0018] The adhesion strength of the reversible adhesive was tested using a universal testing machine (ETM504C). Figure 2 As shown in the figure, this reversible adhesive exhibits ideal adhesion strength (higher than existing technologies), indicating its potential as an excellent reversible adhesive.

[0019] Example 3: Weigh 5g of malic acid and 5g of xylitol, disperse them in 4g of deionized water, and then stir the mixture at 95℃ to dissolve it evenly. After cooling to room temperature, the desired reversible adhesive is obtained.

[0020] Use a pipette or sterile syringe to transfer approximately 60 μL of the reversible adhesive described above and apply it between the surfaces of the materials to be bonded, ensuring full contact between the reversible adhesive and the materials. The coating area should be 1 cm × 1 cm. After drying and curing, the bonding materials will achieve effective adhesion.

[0021] The adhesion strength of the reversible adhesive was tested using a universal testing machine (ETM504C). Figure 2 As shown. Its adhesion strength on different material surfaces was also tested, such as... Figure 3 As shown in the figure, this reversible adhesive exhibits ideal adhesion strength on various material surfaces, indicating its potential as an excellent reversible adhesive. Notably, the adhesion strength on alumina surfaces reaches a maximum of 4.52 MPa, exceeding that of existing technologies.

[0022] Comparative Example 1: A bonding strength test was conducted using a mixture of 5g citric acid and 5g sorbitol dissolved in 4g deionized water as a binder. The bonding strength was as follows: Figure 4 As shown.

[0023] Comparative Example 2: Bond strength tests were conducted using commercially available EasyPower hot melt adhesive as the binder, and the bond strength was as follows: Figure 4 As shown.

[0024] Example 4: A high-strength, environmentally friendly, water-based reversible adhesive is made by uniformly mixing deionized water, organic acid, and alcohol in a mass ratio of 10:20:20.

[0025] Example 5: A high-strength, environmentally friendly, water-based reversible adhesive is made by uniformly mixing deionized water, organic acid, and alcohol in a mass ratio of 50:70:70.

[0026] Example 6: This embodiment provides the following implementation methods for organic acids: (1) tannic acid; (2) tartaric acid; (3) citric acid; (4) malic acid; (5) lactic acid; (6) oxalic acid; (7) succinic acid. In specific implementation, one or more of these can be selected in combination.

[0027] This embodiment also provides the following implementation methods for alcohols: (1) xylitol; (2) sorbitol; (3) mannitol; (4) glucose; (5) sucrose; (6) fructose; (7) maltose; in specific implementation, one or more of these can be selected in combination.

[0028] The organic acids and alcohols used in this invention have good biodegradability, do not pollute the environment, and have no pungent odor, making them relatively safe for users. The materials contain multiple hydroxyl and carboxyl groups, which can form hydrogen bonds with the substrate, enabling the reversible adhesive to achieve high adhesion strength on various substrates. Furthermore, temperature can be adjusted to achieve reversible adhesion to the substrate. This reversible adhesive can be prepared using a one-pot process, making the preparation method simple, low-cost, and easy for large-scale production.

Claims

1. A high-strength, environmentally friendly, water-based reversible adhesive, characterized in that it is made by uniformly mixing deionized water, organic acid, and alcohol in a mass ratio of 10~50:20~70:20~70.

2. The high-strength, environmentally friendly, water-based reversible adhesive as described in claim 1, characterized in that: The organic acid mentioned is one or a combination of several of the following: tannic acid, tartaric acid, citric acid, malic acid, lactic acid, oxalic acid, and succinic acid.

3. The high-strength, environmentally friendly, water-based reversible adhesive as described in claim 1, characterized in that: The alcohols mentioned are one or a combination of xylitol, sorbitol, mannitol, glucose, sucrose, fructose, and maltose.

4. The preparation method of a high-strength, environmentally friendly, water-based reversible adhesive as described in claim 1, characterized in that: Includes the following steps: First, organic acids and alcohols are mixed in a certain mass ratio and then added to a certain mass ratio of deionized water. The mixture is stirred at 95 ℃ until a homogeneous solution is formed, thus obtaining a high-strength, environmentally friendly, water-based reversible adhesive.

Images