Epoxy resin-based elastic coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and relates to an elastic coating based on epoxy resin and a preparation method and application thereof. The coating comprises a coating body, and the coating body is formed by compounding a component A and a component B according to the specific mass ratio of 100: (30.1-37.1). The high-molecular-weight epoxy resin comprises the following components in parts by weight: 60-70 parts of high-molecular-weight epoxy resin, 10-20 parts of low-molecular-weight epoxy resin, 8.5-11.7 parts of calcium sulfate whisker, 3-5 parts of pigment, 0.5-1 part of organic bentonite, 0.5-1 part of silane coupling agent and the like. And the component B is 30.1-37.1 parts by weight of a modified alicyclic amine curing agent. The internal crosslinking degree of the coating and the distance interval between groups can be controlled by regulating and controlling the adding proportion of the two resins, so that the tensile strength of the coating is improved, and meanwhile, the elongation at break of the coating can also be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and relates to an elastic coating based on epoxy resin, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous development of the coating technology field, many various functional coatings have emerged, such as: high-temperature resistant coatings, ceramic coatings, anti-corrosion coatings, flexible coatings, elastic coatings, etc. Among them, the research on elastic coatings has become a key area for many scientific researchers to strive to overcome.

[0003] Most of the currently studied elastic coatings are rubber-like products. Such products have excellent flexibility, wear resistance, and weather resistance. However, their shortcoming is also very obvious: poor adhesion on the surface of most materials, high construction difficulty, and inability to process shaped parts. These shortcomings limit the development of rubber-like elastic coatings. As is well known, the coatings prepared from epoxy coatings have a high crosslinking density and excellent adhesion and anti-corrosion properties. However, this is also the main reason why epoxy coatings do not have elasticity. Therefore, in order to break through the bottleneck of rubber-like products in terms of adhesion and workability, it is urgent to develop a new type of elastic epoxy coating. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and propose an elastic coating based on epoxy resin, a preparation method thereof, and an application thereof.

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

[0006] An elastic coating based on epoxy resin, including a coating, and the coating is compounded by component A and component B in a specific mass ratio of 100:30.1 - 37.1; wherein,

[0007] Component A includes the following components in parts by weight:

[0008] 60 - 70 parts of high molecular weight epoxy resin, 10 - 20 parts of low molecular weight epoxy resin, 8.5 - 11.7 parts by weight of calcium sulfate whiskers, 3 - 5 parts by weight of pigments, 0.5 - 1 part by weight of organic bentonite, 0.5 - 1 part by weight of silane coupling agent, 0.1 - 0.5 part by weight of dispersant, 0.1 - 0.5 part by weight of defoamer, 0.1 - 0.5 part by weight of leveling agent, 2 - 4 parts by weight of solvent;

[0009] Component B is 30.1 - 37.1 parts by weight of a modified alicyclic amine curing agent.

[0010] In this embodiment, the number of parts of component A can be selected according to actual needs. For example, the high molecular weight epoxy resin can be 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 70 parts by weight; the low molecular weight epoxy resin can be 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight; the calcium sulfate whisker can be 8.5 parts by weight, 9.5 parts by weight, 10.5 parts by weight, 11.7 parts by weight; the pigment can be 3 parts by weight, 4 parts by weight, 5 parts by weight; the organic bentonite can be 0.5 parts by weight, 1 part by weight; the silane coupling agent is 0.5 parts by weight, 1 part by weight; the dispersant can be 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight; the defoaming agent can be 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight; the leveling agent can be 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight; the solvent can be 2 parts by weight, 3 parts by weight, 4 parts by weight;

[0011] Further, the high molecular weight epoxy resin is 601 epoxy resin, and the low molecular weight epoxy resin is 828 epoxy resin.

[0012] In this embodiment, the selectable brands of 601 epoxy resin include Nanya, Huntsman, Wanjie, Normanck, etc., and the selectable brands of 828 epoxy resin include Sanmu, Nanya, Hongyuan, etc.

[0013] Further, the dispersant is SN-110 dispersant.

[0014] Further, the defoaming agent is SN-6368A defoaming agent.

[0015] Further, the leveling agent is BYK-354 leveling agent.

[0016] Further, the model of the silane coupling agent is 6040 silane coupling agent.

[0017] Further, the pigment is a mixture of titanium dioxide and organic black colorant, and the mass ratio of titanium dioxide to organic black colorant is 25:1.

[0018] As Figure 1 shown, the present invention also provides a preparation method of an elastic coating based on epoxy resin, including the following steps:

[0019] Step 1: According to specific parts by weight, first put the high molecular weight epoxy resin, low molecular weight epoxy resin, dispersant, defoaming agent, leveling agent, silane coupling agent, and organic bentonite into a dispersion container for the first dispersion, and then put the calcium sulfate whisker, pigment, and solvent into the dispersion container for the second dispersion to form component A;

[0020] Step 2: Mix component A and component B according to a specific mass ratio to obtain an epoxy resin-based elastic coating.

[0021] Further, the rotation speed of the first dispersion is 800 r / min to 1500 r / min, and the time of the first dispersion is 3 min - 5 min; the rotation speed of the second dispersion is 1500 r / min to 3000 r / min, and the time of the second dispersion is 10 min to 20 min.

[0022] The present invention also provides an application of an elastic coating based on the epoxy resin described in any one of the above in the surface coating of a flexible substrate.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] First, by using two epoxy resins with different molecular weights as the main film-forming substances, the present invention can control the crosslinking degree inside the coating and the distance between groups by regulating the addition ratio of the two resins, thereby improving both the tensile strength and the elongation at break of the coating.

[0025] Second, a modified alicyclic amine curing agent is used as the supporting curing agent. This is because after the modified alicyclic amine curing agent reacts with the epoxy group, the molecular chain segment of the curing agent is relatively long, so the crosslinking sites in the formed crosslinking network are far apart, and the molecular chain segment has a large degree of stretchability, making the coating have good elasticity. And the molecule has a rigid cyclic group inside, which improves the tensile strength and fracture strength of the formed coating to a certain extent.

[0026] Third, calcium sulfate whiskers are used as the main filler. This is because calcium sulfate whiskers have high strength and elastic modulus, and have good interfacial bonding force with the film-forming substances in the coating, which can improve the tensile strength and elongation at break of the coating, and prevent the problem that the film-forming substances break due to insufficient strength during bending and stretching of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings here are incorporated into the specification and form a part of this specification, and are used together with the specification to explain the principles of the present invention.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is the preparation flow chart of the elastic coating of the epoxy resin in the present invention. Detailed Implementation Modes

[0030] Here, exemplary embodiments will be described in detail. The implementation modes described in the following exemplary embodiments do not represent all implementation modes consistent with the present invention. On the contrary, they are merely examples consistent with some aspects of the present invention detailed in the appended claims.

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0032] Embodiment 1

[0033] The present invention provides an epoxy resin-based elastic coating, which comprises Component A and Component B, and the mass ratio of Component A to Component B is 100:30.1.

[0034] Among them, Component A includes the following components by weight: 10 parts by weight of 828 epoxy resin; 70 parts by weight of 601 epoxy resin; 8 parts by weight of calcium sulfate whiskers; 3.5 parts by weight of pigment; 1 part by weight of organic bentonite; 1 part by weight of silane coupling agent; 0.5 part by weight of dispersant; 0.5 part by weight of defoamer; 0.5 part by weight of leveling agent; 5 parts by weight of solvent.

[0035] Component B is 30.1 parts by weight of modified alicyclic amine curing agent R-3400, purchased from Ruichi Chemical Co., Ltd.

[0036] The preparation process of the epoxy resin-based elastic coating in this embodiment is as follows:

[0037] Step 1: Weigh the corresponding 828 epoxy resin, 601 epoxy resin, dispersant, defoamer, leveling agent, silane coupling agent, and organic bentonite by weight and put them into a dispersion container for the first dispersion, and then put the calcium sulfate whiskers, pigment, and solvent into the dispersion container for the second dispersion to form Component A; among them, the rotation speed of the first dispersion is 800 r / min, and the time of the first dispersion is 5 min; the rotation speed of the second dispersion is 3000 r / min, and the time of the second dispersion is 10 min.

[0038] Step 2: Mix Component A and Component B according to a specific mass ratio of 100:30.1 to obtain an epoxy resin-based elastic coating.

[0039] Embodiment 2

[0040] This embodiment provides an epoxy resin-based elastic coating, including Component A and Component B. The difference from Embodiment 1 is that the mass ratio of Component A to Component B is 100:32.2

[0041] Among them, component A includes the following components by weight: 13 parts by weight of 828 epoxy resin; 67 parts by weight of 601 epoxy resin; 9 parts by weight of calcium sulfate whisker; 4 parts by weight of pigment; 0.9 parts by weight of organic bentonite; 0.9 parts by weight of silane coupling agent; 0.4 parts by weight of dispersant; 0.4 parts by weight of defoaming agent; 0.4 parts by weight of leveling agent; 4 parts by weight of solvent;

[0042] Component B is 32.2 parts by weight of modified alicyclic amine curing agent R-3400.

[0043] In this embodiment, the preparation process of the epoxy resin-based elastic coating is as follows:

[0044] Step 1: Weigh the corresponding 828 epoxy resin, 601 epoxy resin, dispersant, defoaming agent, leveling agent, silane coupling agent, and organic bentonite by weight and put them into a dispersion container for the first dispersion. Then, put the calcium sulfate whisker, pigment, and solvent into the dispersion container for the second dispersion to form component A. Among them, the rotation speed of the first dispersion is 1150 r / min, and the time of the first dispersion is 4 min; the rotation speed of the second dispersion is 2250 r / min, and the time of the second dispersion is 15 min.

[0045] Step 2: Mix component A and component B according to a specific mass ratio of 100:32.2 to obtain the epoxy resin-based elastic coating.

[0046] Example 3

[0047] This embodiment provides an epoxy resin-based elastic coating, including component A and component B. The difference from Example 1 is that the mass ratio of component A to component B is 100:33.6.

[0048] Among them, component A includes the following components by weight: 15 parts by weight of 828 epoxy resin; 65 parts by weight of 601 epoxy resin; 10 parts by weight of calcium sulfate whisker; 4.5 parts by weight of pigment; 0.8 parts by weight of organic bentonite; 0.8 parts by weight of silane coupling agent; 0.3 parts by weight of dispersant; 0.3 parts by weight of defoaming agent; 0.3 parts by weight of leveling agent; 3 parts by weight of solvent;

[0049] Component B is 33.6 parts by weight of modified alicyclic amine curing agent R-3400.

[0050] In this embodiment, the preparation process of the epoxy resin-based elastic coating is as follows:

[0051] Step 1: Weigh the corresponding 828 epoxy resin, 601 epoxy resin, dispersant, defoamer, leveling agent, silane coupling agent, and organic bentonite by weight and put them into a dispersion container for the first dispersion. Then, put the calcium sulfate whiskers, pigments, and solvents into the dispersion container for the second dispersion to form Component A. Among them, the rotation speed of the first dispersion is 1500 r / min, and the time of the first dispersion is 3 min; the rotation speed of the second dispersion is 1500 r / min, and the time of the second dispersion is 20 min.

[0052] Step 2: Mix Component A and Component B according to a specific mass ratio of 100:33.6 to obtain an epoxy resin-based elastic coating.

[0053] Example 4

[0054] This example provides an epoxy resin-based elastic coating, including Component A and Component B. The difference from Example 1 is that the mass ratio of Component A to Component B is 100:35.

[0055] Among them, Component A includes the following components by weight: 17 parts by weight of 828 epoxy resin; 63 parts by weight of 601 epoxy resin; 11 parts by weight of calcium sulfate whiskers; 5 parts by weight of pigments; 0.7 parts by weight of organic bentonite; 0.7 parts by weight of silane coupling agent; 0.2 parts by weight of dispersant; 0.2 parts by weight of defoamer; 0.2 parts by weight of leveling agent; 2 parts by weight of solvent;

[0056] Component B is 35 parts by weight of modified alicyclic amine curing agent R-3400.

[0057] The preparation process of the epoxy resin-based elastic coating in this example is as follows:

[0058] Step 1: Weigh the corresponding 828 epoxy resin, 601 epoxy resin, dispersant, defoamer, leveling agent, silane coupling agent, and organic bentonite by weight and put them into a dispersion container for the first dispersion. Then, put the calcium sulfate whiskers, pigments, and solvents into the dispersion container for the second dispersion to form Component A. Among them, the rotation speed of the first dispersion is 1200 r / min, and the time of the first dispersion is 4 min; the rotation speed of the second dispersion is 1800 r / min, and the time of the second dispersion is 17 min.

[0059] Step 2: Mix Component A and Component B according to a specific mass ratio of 100:35 to obtain an epoxy resin-based elastic coating.

[0060] Example 5

[0061] This embodiment provides an epoxy resin-based elastic coating, which includes component A and component B. The difference from Example 1 is that the mass ratio of component A to component B is 100:37.1

[0062] Among them, component A includes the following components by weight: 20 parts by weight of 828 epoxy resin; 60 parts by weight of 601 epoxy resin; 12 parts by weight of calcium sulfate whiskers; 5.5 parts by weight of pigment; 0.6 parts by weight of organic bentonite; 0.6 parts by weight of silane coupling agent; 0.1 parts by weight of dispersant; 0.1 parts by weight of defoaming agent; 0.1 parts by weight of leveling agent; 1 part by weight of solvent;

[0063] Component B is 37.1 parts by weight of modified alicyclic amine curing agent R-3400.

[0064] The preparation process of the epoxy resin-based elastic coating in this embodiment is as follows:

[0065] Step 1: Weigh the corresponding 828 epoxy resin, 601 epoxy resin, dispersant, defoaming agent, leveling agent, silane coupling agent, and organic bentonite by weight and put them into a dispersion container for the first dispersion. Then, put the calcium sulfate whiskers, pigment, and solvent into the dispersion container for the second dispersion to form component A. Among them, the rotation speed of the first dispersion is 1300 r / min, and the time of the first dispersion is 5 min; the rotation speed of the second dispersion is 2500 r / min, and the time of the second dispersion is 12 min.

[0066] Step 2: Mix component A and component B according to a specific mass ratio of 100:37.1 to obtain the epoxy resin-based elastic coating.

[0067] Table 1 Composition of elastic epoxy coatings in each example and comparative example

[0068]

[0069] Table 2 Performance test results of elastic epoxy coatings in each example

[0070]

[0071] In the above embodiments, Examples 1-5 prove that the samples prepared by combining epoxy resins with two different molecular weights and a modified alicyclic amine curing agent can meet all test requirements, and the elongation at break can reach up to 224%. It can be seen from the results of Examples 1-5 that by increasing the use of the small molecular weight epoxy resin (Epoxy resin 828) in the formulation, the elongation at break of its coating shows a trend of first increasing and then decreasing. This is because the molecular chain segments of the large molecular weight epoxy resin are longer, and the internal molecules in the coating have a larger stretching space when combined with the curing agent, which can improve the elasticity of the coating. While the molecular chain segments of the small molecular epoxy resin combined with the curing agent are shorter, and the formed coating has a higher crosslinking degree, which can improve the fracture strength of the coating. In Example 1, the proportion of the large molecular weight epoxy resin is relatively high, and the coating has a large stretching space, but the crosslinking degree of the coating is not high, and the coating is prone to fracture before the stretching limit. In Example 3, the proportion of the large molecular weight is significantly increased, the crosslinking degree of the coating is relatively high, and the stretching space of the internal molecules in the coating becomes smaller, resulting in a relatively large tensile strength and a relatively small elongation at break of the coating. The formulation of Example 2 is the best, and its elongation at break can reach 224%.

[0072] Comparative Example 1

[0073] This comparative example provides an epoxy resin-based elastic coating, which contains Component A and Component B.

[0074] Among them, Component A includes the following components in parts by weight: 13 parts by weight of Epoxy resin 828; 67 parts by weight of Epoxy resin 601; 9 parts by weight of calcium sulfate whisker; 4 parts by weight of pigment; 0.9 parts by weight of organic bentonite; 0.9 parts by weight of silane coupling agent; 0.9 parts by weight of dispersant; 0.4 parts by weight of defoaming agent; 0.4 parts by weight of leveling agent; 4 parts by weight of solvent;

[0075] Component B is 32.2 parts by weight of Curing agent 650, and the above components can all be purchased in the market.

[0076] Comparative Example 2

[0077] This comparative example provides an epoxy resin-based elastic coating, which contains Component A and Component B.

[0078] Among them, Component A includes the following components in parts by weight: 15 parts by weight of Epoxy resin 828; 35 parts by weight of Epoxy resin 601; 33 parts by weight of calcium sulfate whisker; 15 parts by weight of pigment; 0.2 parts by weight of organic bentonite; 0.5 parts by weight of silane coupling agent; 0.1 parts by weight of dispersant; 0.1 parts by weight of defoaming agent; 0.1 parts by weight of leveling agent; 4 parts by weight of solvent;

[0079] Component B is 24.9 parts by weight of modified alicyclic amine curing agent R-3400.

[0080] Comparative Example 3

[0081] This comparative example provides an epoxy resin-based elastic coating, which contains Component A and Component B.

[0082] Among them, Component A includes the following components by weight: 70 parts by weight of 601 epoxy resin; 19.6 parts by weight of calcium sulfate whiskers; 5 parts by weight of pigment; 0.5 part by weight of organic bentonite; 1 part by weight of silane coupling agent; 0.3 part by weight of dispersant; 0.3 part by weight of defoamer; 0.3 part by weight of leveling agent; 3 parts by weight of solvent;

[0083] Component B is 20.5 parts by weight of modified alicyclic amine curing agent R-3400.

[0084] Comparative Example 4

[0085] This comparative example provides an epoxy resin-based elastic coating, which contains Component A and Component B.

[0086] Among them, Component A includes the following components by weight: 70 parts by weight of 828 epoxy resin; 18.5 parts by weight of calcium sulfate whiskers; 5 parts by weight of pigment; 1 part by weight of organic bentonite; 1 part by weight of silane coupling agent; 0.5 part by weight of dispersant; 0.5 part by weight of defoamer; 0.5 part by weight of leveling agent; 3 parts by weight of solvent;

[0087] Component B is 69.6 parts by weight of modified alicyclic amine curing agent R-3400.

[0088] Table 3 Composition of elastic epoxy coatings in each comparative example

[0089]

[0090]

[0091] Table 4 Performance test results of elastic epoxy coatings in each comparative example

[0092]

[0093] The elongation at break of Comparative Examples 1-4 was significantly lower compared to Examples 1-5. In Comparative Example 1, the modified alicyclic amine curing agent was changed to a common polyamide curing agent. Compared with the modified alicyclic amine curing agent, the molecular chain segment of this curing agent is shorter, and the amino groups are closer to each other. When crosslinked with epoxy resin into a network structure, the stretchable distance of the molecular chain segments is limited, resulting in a lower elongation at break. In Comparative Example 2, the content of 828 epoxy resin was reduced and the proportion of pigments and fillers was increased. However, the stretchability of the coating mainly comes from the main framework of the coating, and this framework is formed by the reaction of resin and curing agent. Reducing the resin content will significantly reduce the elongation at break of the coating. However, the addition of more pigments and fillers will improve the overall strength of the coating, resulting in an increase in tensile strength. This is because the contact area between the pigments and fillers and the resin is larger, which is beneficial to increasing the internal stress in the coating. The reduction in the elongation at break of Comparative Examples 3-4 is because a single resin cannot simultaneously take into account the tensile strength and elongation at break of the coating.

[0094] It should be noted that:

[0095] For the test method of the adhesion of the elastic epoxy coating, the prepared samples were measured according to the standard of GB / T 5210-1993 "Paints and varnishes - Pull-off test for adhesion".

[0096] For the test method of the flexibility of the elastic epoxy coating, the prepared samples were tested according to GB / T 1731-1993 "Method for the determination of flexibility of films".

[0097] For the test method of the impact resistance of the elastic epoxy coating, the prepared samples were measured according to the standard of GB / T 1732-1993 "Method for the determination of impact resistance of films".

[0098] For the test method of the elongation at break of the elastic epoxy coating, the prepared samples were measured according to the standard of GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0099] For the test method of the tensile strength of the elastic epoxy coating, the prepared samples were measured according to the standard of GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0100] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0101] It should be understood that the present invention is not limited to what has been described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. An elastic coating based on epoxy resin, characterized in that: The coating comprises a component A and a component B compounded in a specific mass ratio of 100:30.1-37.1; wherein, The component A comprises the following components in parts by weight: 60-70 parts by weight of high molecular weight epoxy resin, 10-20 parts by weight of low molecular weight epoxy resin, 8.5-11.7 parts by weight of calcium sulfate whisker, 3-5 parts by weight of pigment, 0.5-1 part by weight of organic bentonite, 0.5-1 part by weight of silane coupling agent, 0.1-0.5 part by weight of dispersant, 0.1-0.5 part by weight of defoamer, 0.1-0.5 part by weight of leveling agent, 2-4 parts by weight of solvent; The component B is 30.1 to 37.1 parts by weight of a modified alicyclic amine curing agent.

2. The epoxy resin-based elastic coating according to claim 1, characterized in that: The high molecular weight epoxy resin is 601 epoxy resin, and the low molecular weight epoxy resin is 828 epoxy resin.

3. The epoxy resin-based elastic coating according to claim 1, characterized in that: The dispersant is SN-110 dispersant.

4. The epoxy resin-based elastic coating according to claim 1, characterized in that: The defoamer is SN-6368A defoamer.

5. The epoxy resin-based elastic coating according to claim 1, characterized in that: The leveling agent is BYK-354 leveling agent.

6. The epoxy resin-based elastic coating according to claim 1, characterized in that: The model of the silane coupling agent is 6040 silane coupling agent.

7. The epoxy resin-based elastic coating according to claim 1, characterized in that: The pigment is a mixture of titanium dioxide and an organic black colorant, and the mass ratio of the titanium dioxide to the organic black colorant is 25:

1.

8. A method for preparing an elastic coating based on epoxy resin according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: First, according to specific weight parts, a high molecular weight epoxy resin, a low molecular weight epoxy resin, a dispersant, a defoamer, a leveling agent, a silane coupling agent, and an organic bentonite are placed in a dispersion container for a first dispersion, and then calcium sulfate whiskers, a pigment, and a solvent are placed in a dispersion container for a second dispersion to form component A; Step 2: Mix component A and component B according to a specific weight ratio to obtain an elastic coating based on epoxy resin.

9. The method for preparing the epoxy resin-based elastic coating according to claim 8, characterized in that: The rotation speed of the first dispersion is 800r / min to 1500r / min, and the time of the first dispersion is 3min to 5min; the rotation speed of the second dispersion is 1500r / min to 3000r / min, and the time of the second dispersion is 10min to 20min.

10. Use of an elastic coating based on the epoxy resin according to any one of claims 1 to 7 in coating the surface of a flexible substrate.

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