Universal and reliable soft and wet coating adhesion characterization method

Abstract

The invention discloses a universal and reliable soft and wet coating adhesion characterization method, which uses the following patches: the patch comprises a backing layer and a functional polymer chain, the backing layer is a synthetic adhesion patch, and the functional polymer chain is connected with the inner surface of the backing layer through chemical grafting. The functional polymer chain grafted on the patch can form an interconnection factor with the soft and wet coating, and can be quickly and tough adhered together with the coating under the condition of not changing the mechanical property of the coating, so that an effective means is provided for characterizing the adhesion strength between the soft and wet coating and a substrate material. Meanwhile, the patch can form rapid, tough, underwater, reversible, detachable and conductive bonding with different types of soft and wet coatings. Results show that the adhesion characterization method for grafting the functional polymer chain on the backing layer can be used for accurately measuring the adhesion strength between various soft and wet coatings and the substrate material, and has universality.

Description

Technical Field

[0001] The invention relates to a backing layer and a functional polymer material, and in particular to a universal and reliable soft wet coating bonding characterization method. Background Art

[0002] Soft-wet coating is a new type of coating material composed of polymer network and solvent (water, oil, etc.). Due to its soft, wet, biocompatible and other characteristics, soft-wet coating can add new functions (such as lubrication, anti-fouling, etc.) to the base material without changing the properties of the base material, and is widely used in the fields of life medicine and engineering.

[0003] The bonding quality between soft-wet coatings and substrate materials is crucial and will directly affect the stability and reliability of related applications. Therefore, the characterization of soft-wet coating bonding is of great significance to its design and application, but it is full of challenges. The characterization of the bonding between soft-wet materials and substrate materials usually requires that the backing layer be firmly adhered to the soft-wet material for mechanical loading and measurement, and the backing layer and the soft-wet material are adhered together by cyanoacrylate (502 glue). Since cyanoacrylate reacts with water, it will penetrate into the soft-wet coating while achieving rapid and strong bonding, generating a white glassy substance, hardening the coating, changing the mechanical properties of the coating, and even destroying the coating. Therefore, the characterization method of soft-wet material bonding is not suitable for the characterization of soft-wet coating bonding. Therefore, there is an urgent need to develop a new, universal and reliable characterization method for soft-wet coating bonding. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention aims to provide a universal and reliable soft-wet coating adhesion characterization method, which can accurately measure the strength of the adhesion between the soft-wet coating and the substrate material.

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

[0006] The first aspect of the present invention provides a universal and reliable soft and wet coating adhesion characterization patch, comprising a backing layer and a functional polymer chain, wherein the backing layer is a synthetic adhesive patch, and the functional polymer chain is connected to the inner surface of the backing layer by chemical grafting; the functional polymer chain can form a rapid and strong bond with the soft and wet coating without changing the mechanical properties of the coating.

[0007] Furthermore, the functional polymer chain can form an underwater, reversible, detachable and conductive bond with the soft wet coating without changing the mechanical properties of the coating material.

[0008] Furthermore, an interconnection factor may be formed between the functional polymer chain and the soft wet coating, and the interaction force between the interconnection factors is a covalent bond, a non-covalent bond, or a topological entanglement.

[0009] Furthermore, the chemical grafting treatment method is a covalent grafting method, the reaction conditions are ultraviolet light irradiation, the reaction time is 2 to 3 hours, and the ambient temperature is 18 to 25°C.

[0010] Furthermore, the chemical grafting treatment method is to induce free radicals on the surface of the backing layer using the photoinitiator benzophenone, and then under ultraviolet light irradiation, the functional polymer chain monomers combine with the free radicals on the backing layer to form chemical grafting.

[0011] Furthermore, the functional polymer chain monomer is an acrylic monomer, and the backing layer is a polyethylene terephthalate film.

[0012] Furthermore, the thickness of the backing layer is in the order of 10 to 100 micrometers, and the length of the functional polymer chain is in the order of 10 to 100 nanometers.

[0013] Furthermore, the material of the soft wet coating is at least one of polyacrylamide, poly(2-hydroxyethyl methacrylate), and polyacryloyloxyethyl trimethyl ammonium chloride.

[0014] The second aspect of the present invention provides a universal and reliable soft-wet coating adhesion characterization method, which is a peeling method, comprising the following steps: using the above-mentioned soft-wet coating adhesion characterization patch to bond with the soft-wet coating, forming a patch-soft-wet coating adhesive through the interconnection factor between the functional polymer chain on the patch and the soft-wet coating material; then using a measuring device to measure the peeling force between the patch-soft-wet coating adhesive and the substrate, and characterizing the adhesion between the soft-wet coating and the substrate.

[0015] Furthermore, the bonding characterization method introduces an initial crack on the bonding interface between the soft-wet coating and the substrate, then applies a load at a fixed peeling angle and speed to peel the soft-wet coating from the substrate, and records the force-displacement curve in real time.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention proposes a universal and reliable soft-wet coating adhesion characterization method, which can accurately measure the strength of the adhesion between the soft-wet coating and the substrate material.

[0018] 2. The backing layer materials and functional polymer materials used in the present invention have a wide range of options and are suitable for characterizing the adhesion between different types of soft and wet coatings and substrate materials.

[0019] 3. The functional polymer materials and grafting methods thereof in the present invention have a large chemical design space and flexibility, and can form fast, strong, underwater, reversible, detachable and conductive bonding between soft and wet coatings, and are suitable for characterizing the bonding between soft and wet coatings and substrate materials in a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a universal and reliable soft and wet coating adhesion characterization patch in Example 1 of the present invention.

[0021] Figure 2 This is a schematic diagram of a universal and reliable soft wet coating bonding characterization patch in Example 1 of the present invention.

[0022] Figure 3 This is a diagram of an experimental measurement device for a universal and reliable soft-wet coating adhesion characterization method in Example 2 of the present invention.

[0023] Figure 4 This is a graph showing the results of measuring the bonding toughness of three soft wet coatings, namely polyacrylamide, poly-2-hydroxyethyl methacrylate, and polyacryloyloxyethyl trimethyl ammonium chloride, in Example 2 of the present invention.

[0024] Figure 1 middle:

[0025] 1- backing layer; 2- functional polymer chain; 3- chemical grafting. DETAILED DESCRIPTION

[0026] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention. The following is a description of the principles and features of the present invention, and the examples cited are only used to explain the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that, in the embodiments, those without specifying specific conditions are carried out under normal conditions.

[0027] Example 1: Universal and reliable soft wet coating adhesion characterization patch

[0028] This embodiment is used to provide a universal and reliable soft wet coating adhesion characterization patch of the present invention, Figure 1 This is a schematic diagram of the structure of the bonding characterization patch. It should be noted that Figure 1 The backing layer and the functional polymer chain in the figure are not real sizes, but schematic diagrams magnified several times. In the present invention, the thickness of the backing layer 1 is on the order of 10 to 100 microns, and the length of the functional polymer chain 2 is on the order of 10 to 100 nanometers.

[0029] like Figure 1 As shown, a universal and reliable soft wet coating adhesion characterization patch comprises a backing layer 1 and a functional polymer chain 2, wherein the backing layer 1 is a synthetic adhesive patch, and the functional polymer chain 2 is connected to the inner surface of the backing layer 1 through chemical grafting 3.

[0030] In the present invention, the functional polymer chain 2 can form a fast and strong bond with the soft wet coating without changing the mechanical properties of the coating. Specifically, the functional polymer chain 2 can form an underwater, reversible, detachable and conductive bond with the soft wet coating without changing the mechanical properties of the coating material.

[0031] Among them, the functional polymer chain 2 can form a fast and strong bond with a variety of soft and wet coatings, for example, a soft and wet coating whose main materials are polyacrylamide, poly 2-hydroxyethyl methacrylate, and polyacryloyloxyethyl trimethyl ammonium chloride.

[0032] As a preferred implementation, the treatment method of chemical grafting 3 is covalent grafting, the reaction conditions are ultraviolet light irradiation, the reaction time is 2 to 3 hours, and the ambient temperature is 18 to 25°C.

[0033] Figure 2 Schematic diagram of the universal and reliable soft wet coating adhesion characterization method of the present invention. Figure 2 As shown, interconnection factors can be formed between the functional polymer chains on the backing layer and the soft wet coating, and the interaction force between the interconnection factors can be covalent bonds, non-covalent bonds, or topological entanglement.

[0034] As a specific implementation method, grafting polyacrylic acid polymer chains on the backing layer 1 of the patch can accurately measure the adhesion between the polyacrylamide coating and the glass substrate, and hydrogen bonds are established between the carboxyl groups on the polyacrylic acid polymer chains and the amide groups on the polyacrylamide polymer network of the soft and wet coating material to form interconnection factors, thereby achieving fast, strong, reversible and stable adhesion without changing or destroying the coating material.

[0035] In the present invention, the interconnection factor can be formed quickly, so the bonding can be formed quickly. The interconnection factor is strong enough to cause the toughening factor in the soft wet coating polymer network to crack, so the bonding is strong.

[0036] Example 2: Universal and reliable soft-wet coating adhesion characterization method

[0037] Based on the coating adhesion characterization patch of Example 1, this embodiment is used to provide a universal and reliable soft-wet coating adhesion characterization method, and the patch of Example 1 is bonded to the soft-wet coating to form a patch-soft-wet coating adhesive; then a measuring device is used to measure the peeling force between the patch-soft-wet coating adhesive and the substrate to characterize the adhesion between the soft-wet coating and the substrate.

[0038] As a specific implementation, in this embodiment, under ultraviolet light irradiation, the photoinitiator benzophenone induces free radicals on the surface of the polyethylene terephthalate (PET) film (i.e., the backing layer). Then, under ultraviolet light irradiation, the acrylic acid monomer combines with the free radicals on the polyethylene terephthalate film and gradually grafts to form a polyacrylic acid polymer chain (i.e., a functional polymer chain). The PET film grafted with the polyacrylic acid polymer chain can establish a fast and strong bond with the polyacrylamide coating, and the bonding is achieved by establishing a hydrogen bond (interconnection factor) between the carboxyl group on the polyacrylic acid polymer chain and the amide group on the polyacrylamide polymer network. In addition, the PET film grafted with the polyacrylic acid polymer chain can also achieve fast and strong bonding with the two soft and wet coatings of polyacryloyloxyethyl trimethyl ammonium chloride and poly (2-hydroxyethyl methacrylate) through hydrogen bonds.

[0039] Figure 3 This is a diagram of the experimental measurement device of the present invention. The lower surface of the soft-wet coating is coated on the substrate material, and a backing layer (i.e., patch) having functional polymer chains is adhered and grafted to the upper surface. The coating is connected to the fixture of the mechanical testing machine through the patch. Before the test begins, an initial crack is introduced at the bonding interface between the soft-wet coating and the substrate. Thereafter, a load is applied at a fixed peeling angle and speed, the soft-wet coating is peeled off from the substrate, and the force-displacement curve is recorded in real time. As a specific embodiment, the characterization method for the adhesion of the soft-wet coating is a 90-degree peeling method, the initial crack length is 1 cm, the peeling angle is 90 degrees, the peeling speed is 10 cm / min, and the ambient temperature is room temperature (18-25°C).

[0040] Using the above method, the bonding toughness of the soft wet coating was characterized by a 90 degree peel test method after bonding. The bonding toughness of three soft wet coatings, polyacrylamide, poly 2-hydroxyethyl methacrylate, and polyacryloyloxyethyl trimethyl ammonium chloride, to the glass substrate was measured. The results are as follows Figure 4 shown.

[0041] Figure 4 The bonding toughness characterization results are as follows: The bonding toughness between the polyacrylamide coating and the glass substrate is 149.91±17.66 J / m 2 The bonding toughness between polyacryloyloxyethyl trimethyl ammonium chloride coating and glass substrate is 64.47±3.91 J / m 2 The bonding toughness of poly(2-hydroxyethyl methacrylate) coating to glass substrate is 78.54±7.86 J / m 2 It can be seen that the soft-wet coating adhesion characterization patch and method of the present invention can accurately measure the strength of adhesion between three soft-wet coatings and substrate materials.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A universal and reliable soft wet coating bonding characterization patch, characterized in that, The invention comprises a backing layer (1) and a functional polymer chain (2), wherein the backing layer (1) is a synthetic adhesive patch, and the functional polymer chain (2) is connected to the inner surface of the backing layer (1) through chemical grafting (3); the functional polymer chain (2) can form a rapid and strong bond with the soft and wet coating without changing the mechanical properties of the coating.

2. A universal and reliable soft wet coating adhesion characterization patch according to claim 1, characterized in that: The functional polymer chain (2) can form an underwater, reversible, detachable and conductive bond with the soft wet coating without changing the mechanical properties of the coating material.

3. A universal and reliable soft wet coating adhesion characterization patch according to claim 1, characterized in that: Interconnection factors can be formed between the functional polymer chain (2) and the soft wet coating, and the interaction force between the interconnection factors is a covalent bond, a non-covalent bond, or a topological entanglement.

4. A universal and reliable soft wet coating adhesion characterization patch according to claim 1, characterized in that: The treatment method of chemical grafting (3) is a covalent grafting method, the reaction conditions are ultraviolet light irradiation, the reaction time is 2 to 3 hours, and the ambient temperature is 18 to 25°C.

5. A universal and reliable soft wet coating adhesion characterization patch according to claim 4, characterized in that: The processing method of the chemical grafting (3) is that the photoinitiator benzophenone induces free radicals on the surface of the backing layer (1), and then under ultraviolet light irradiation, the monomers of the functional polymer chain (2) combine with the free radicals on the backing layer (1) to form the chemical grafting (3).

6. A universal and reliable soft wet coating adhesion characterization patch according to claim 5, characterized in that: The functional polymer chain (2) is a polyacrylic acid polymer chain, and the backing layer (1) is a polyethylene terephthalate film.

7. A universal and reliable soft wet coating adhesion characterization patch according to claim 1, characterized in that: The thickness of the backing layer (1) is in the order of 10 to 100 micrometers, and the length of the functional polymer chain (2) is in the order of 10 to 100 nanometers.

8. A universal and reliable soft wet coating adhesion characterization patch according to claim 1, characterized in that: The material of the soft wet coating is at least one of polyacrylamide, poly(2-hydroxyethyl methacrylate), and polyacryloyloxyethyl trimethyl ammonium chloride.

9. A universal and reliable method for characterizing the adhesion of soft and wet coatings, characterized in that: The bonding characterization method is a stripping method, comprising the following steps: using the soft wet coating bonding characterization patch as described in any one of claims 1 to 8 to bond with the soft wet coating, and forming a patch-soft wet coating adhesive through the interconnection factor between the functional polymer chain (2) on the patch and the soft wet coating material; The peeling force between the patch-soft-wet coating adhesive and the substrate is then measured using a measuring device to characterize the adhesion between the soft-wet coating and the substrate.

10. The universal and reliable soft-wet coating adhesion characterization method according to claim 9, characterized in that: The bonding characterization method introduces an initial crack on the bonding interface between the soft-wet coating and the substrate, then applies a load at a fixed peeling angle and speed to peel the soft-wet coating from the substrate, and records the force-displacement curve in real time.

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