High-adhesion coating liquid for ETFE (Ethylene Tetra Fluoro Ethylene) film

Abstract

The invention relates to the technical field of ETFE (Ethyl Tetra Fluoro Ethylene) films, in particular to a high-adhesion coating liquid for an ETFE film. Comprising the following components in parts by weight: 20-40 parts of methyl pyrrolidone, 20-40 parts of a low-boiling-point solvent, 10-30 parts of vinyl pyrrolidone, 10-30 parts of a multifunctional vinyl cross-linking agent, 10-30 parts of long-carbon-chain monofunctional acrylate, 0.5-9 parts of a silane coupling agent, 0.5-9 parts of a photoinitiator and 100 parts of multifunctional acrylic resin. Through the synergistic effect of the methyl pyrrolidone, the vinyl pyrrolidone, the silane coupling agent, the long-carbon-chain acrylate and the like, the adhesive force between the ETFE and the EVA adhesive film can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of ETFE films, in particular to a high-adhesive coating liquid for ETFE films. Background Art

[0002] ETFE (ethylene-tetrafluoroethylene) film has great application potential due to its good light transmittance and weather resistance, such as lightweight photovoltaic modules. However, ETFE film is difficult to bond, and the bonding force is generally <5N / CM, which limits its application. Therefore, how to solve the bonding problem of ETFE film has become a research hotspot in the industry. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a coating liquid with high adhesive force for ETFE film to solve the above problems.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a coating liquid with high adhesive force for ETFE film, comprising the following components by weight:

[0005] Methylpyrrolidone 20-40 parts

[0006] 20-40 parts of low boiling point solvent

[0007] Vinyl pyrrolidone 10-30 parts

[0008] 10-30 parts of multifunctional vinyl crosslinking agent

[0009] 10-30 parts of long carbon chain monofunctional acrylate

[0010] Silane coupling agent 0.5-9 parts

[0011] Photoinitiator 0.5-9 parts

[0012] 100 parts of multifunctional acrylic resin.

[0013] As a further embodiment of the present invention, the low boiling point solvent is one or more of methanol, ethanol, ethyl acetate, butanone, cyclohexane, methylcyclohexane or petroleum ether.

[0014] As a further embodiment of the present invention, the multifunctional vinyl crosslinking agent is one or more of TAIC, TMPTA, ethoxylated TMPTA, propoxylated TMPTA, or hexanediol diacrylate.

[0015] As a further embodiment of the present invention, the long carbon chain monofunctional acrylate is isooctyl acrylate, lauric acrylate, octadecyl acrylate, n-butyl acrylate, isobutyl acrylate, or tert-butyl acrylate.

[0016] As a further embodiment of the present invention, the silane coupling agent is KH570 or KH171.

[0017] As a further embodiment of the present invention, the photoinitiator is photoinitiator 184 or photoinitiator 1173.

[0018] As a further embodiment of the present invention, a soaking solution is included, wherein the soaking solution comprises the following components in parts by weight:

[0019]

[0020] As a further embodiment of the present invention, the low-boiling-point low-grade solvent is one or more of methylcyclohexane, cyclohexane, n-hexane or petroleum ether.

[0021] Since the present invention adopts the above technical solution, the present invention has the following advantages and positive effects:

[0022] 1. Methyl pyrrolidone and vinyl pyrrolidone can dissolve and wet ETFE and improve its adhesion;

[0023] 2. The silane coupling agent undergoes a cross-linking reaction with the silane in the EVA film formula, thereby improving the bonding strength between ETFE and EVA film;

[0024] 3. Long carbon chain acrylate, the carbon chain structure is similar and compatible with ETFE, which can improve the adhesion of ETFE. DETAILED DESCRIPTION

[0025] A coating liquid with high adhesive force for ETFE film of the present invention comprises the following components in parts by weight:

[0026]

[0027] Methyl pyrrolidone plays a role in dissolving and wetting ETFE; low boiling point solvent plays a role in driving the volatilization of methyl pyrrolidone; multifunctional vinyl cross-linking agent plays a role in cross-linking and film-forming; long carbon chain acrylate plays a role in wetting ETFE and forming a film; vinyl pyrrolidone plays a role in wetting ETFE and forming a film; acrylic resin plays a role in providing viscosity and film-forming; silane coupling agent plays a role in bonding with the adhesive layer.

[0028] Wherein, the low boiling point solvent is one or more of methanol, ethanol, ethyl acetate, butanone, cyclohexane, methylcyclohexane or petroleum ether.

[0029] Wherein, the multifunctional vinyl crosslinking agent is one or more of TAIC, TMPTA, ethoxylated TMPTA, propoxylated TMPTA or hexanediol diacrylate.

[0030] Wherein, the long carbon chain monofunctional acrylate is isooctyl acrylate, lauric acrylate, octadecyl acrylate, n-butyl acrylate, isobutyl acrylate or tert-butyl acrylate.

[0031] Wherein, the silane coupling agent is KH570 or KH171.

[0032] Wherein, the photoinitiator is photoinitiator 184 or photoinitiator 1173.

[0033] The present invention further comprises a soaking liquid, wherein the soaking liquid comprises the following components in parts by weight:

[0034]

[0035] Wherein, the low-boiling-point low-grade solvent is one or more of methylcyclohexane, cyclohexane, n-hexane or petroleum ether.

[0036] The present invention further provides a method of using the present invention as follows: before applying the coating liquid on the ETFE film, applying the soaking liquid, and then drying at 120°C after applying the coating liquid, and UV curing. The soaking liquid can promote the adhesion of the coating liquid to the ETFE.

[0037] Example 1

[0038] Based on 100 parts of multifunctional acrylic resin: X parts of methyl pyrrolidone, Y parts of ethyl acetate, Z parts of vinyl pyrrolidone, 20 parts of TAIC, 20 parts of octyl acrylate, 2 parts of silane coupling agent KH570, and 1841.5 parts of photoinitiator; after coating, dry at 120°C, UV cure, and test the adhesion to the EVA film.

[0039] The addition amount of methyl pyrrolidone, ethyl acetate, vinyl pyrrolidone, adhesion, coating liquid processability, and UV curing performance data in the examples are shown in Table 1

[0040]

[0041]

[0042] Table 1

[0043] As shown in Table 1, methyl pyrrolidone can improve the adhesion of ETFE due to its dissolving and wetting effects, but it is difficult to dry more than 40 parts due to its high boiling point; so it is necessary to heat the low boiling point solvent, but when acetic acid and ethyl ester are added to 50 parts, the viscosity of the coating liquid is too low, and glue overflow occurs; vinyl pyrrolidone can improve the adhesion due to its dissolving and wetting effects on ETFE, but its double bond undergoes UV polymerization at a slow speed, and it cannot be completely cured when it is increased to 30 parts.

[0044] Example 2

[0045] Based on 100 parts of multifunctional acrylic resin: 30 parts of methyl pyrrolidone, 30 parts of ethyl acetate, 20 parts of vinyl pyrrolidone, 20 parts of TAIC, and 1841.5 parts of photoinitiator; after coating, dry at 120°C, UV cure, and test the adhesion with EVA film.

[0046] The addition amount, adhesion, coating processability and UV curing performance data of KH570 and KH171 in the examples are shown in Table 2

[0047]

[0048]

[0049] Table 2

[0050] As shown in Table 2, silane coupling agent can improve the adhesion between ETFE and EVA film. The main reason is that it can undergo cross-linking reaction with silane in the EVA film formula. However, due to the methyl group on the propylene bond of KH570, UV curing is slow, and UV cannot be completely cured after adding 15 parts. The side chain steric hindrance of KH171 is very large, and UV curing is incomplete when it is added to 9 parts.

[0051] Example 3

[0052] Based on 100 parts of multifunctional acrylic resin: 30 parts of methyl pyrrolidone, 30 parts of ethyl acetate, 20 parts of vinyl pyrrolidone, 20 parts of TAIC, 2 parts of KH570 and 1841.5 parts of photoinitiator; after coating, dry at 120°C, UV cure, and test the adhesion to EVA film.

[0053] The amount of additives added, adhesion, coating liquid processability, and UV curing performance data in the examples are shown in Table 3

[0054]

[0055] Table 3

[0056] As shown in Table 3, the long carbon chain acrylate has a similar carbon chain structure to ETFE and is compatible with ETFE, so the adhesion of ETFE can be improved; however, the long carbon chain acrylate free radicals are easily embedded and UV curing is slow, so lauryl acrylate and octadecyl acrylate cannot be completely cured by UV, and 30 parts of isooctyl acrylate cannot be completely cured either.

[0057] Example 4

[0058] The soaking liquid is calculated as 90 parts of cyclohexane, 10 parts of methylcyclohexane, 30 parts of methylpyrrolidone, X parts of ETFE, Y parts of SBS, and Z parts of petroleum resin; after soaking and coating, preliminary drying is carried out, and UV coating liquid is applied. The coating liquid is calculated as 100 parts of multifunctional acrylic resin: 30 parts of methylpyrrolidone, 30 parts of ethyl acetate, 20 parts of vinylpyrrolidone, 20 parts of TAIC, 2 parts of KH570, 20 parts of n-butyl acrylate, and 1841.5 parts of photoinitiator; after coating, it is dried at 120°C, UV cured, and the adhesion with EVA film is tested.

[0059] The appearance and bonding strength data of ETFE, SBS and petroleum resin in the embodiment are shown in Table 4

[0060]

[0061] Table 4

[0062] As shown in Table 4, the soaking liquid can promote the adhesion of the UV coating layer to ETFE. Due to the principle of similar compatibility, adding ETFE particles can improve the bonding force, but it cannot be completely dissolved when added to 8 parts, so the soaking liquid becomes turbid. Adding SBS resin can also improve the bonding force, but it cannot be completely dissolved when it reaches 15 parts. Petroleum tackifying resin is a small carbon chain molecule with polar groups such as hydroxyl and carboxyl. Adding petroleum tackifying resin can also improve the bonding force and has good solubility, but because it is a small molecule, the film-forming property of the soaking liquid decreases, so adding it to 8 parts instead decreases the bonding force.

[0063] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A coating liquid with high adhesive force for ETFE film, characterized in that: It includes the following components by weight: Methyl pyrrolidone 20-40 parts 20-40 parts of low boiling point solvent Vinyl pyrrolidone 10-30 parts Multifunctional vinyl crosslinking agent 10-30 parts 10-30 parts of long carbon chain monofunctional acrylate Silane coupling agent 0.5-9 parts Photoinitiator 0.5-9 parts 100 parts of multifunctional acrylic resin.

2. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: The low boiling point solvent is one or more of methanol, ethanol, ethyl acetate, butanone, cyclohexane, methylcyclohexane or petroleum ether.

3. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: The multifunctional vinyl crosslinking agent is one or more of TAIC, TMPTA, ethoxylated TMPTA, propoxylated TMPTA, or hexanediol diacrylate.

4. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: The long carbon chain monofunctional acrylate is isooctyl acrylate, lauric acrylate, octadecyl acrylate, n-butyl acrylate, isobutyl acrylate or tert-butyl acrylate.

5. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: The silane coupling agent is KH570 or KH171.

6. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: The photoinitiator is photoinitiator 184 or photoinitiator 1173.

7. a kind of ETFE film according to claim 1 is characterized in that with the coating liquid of high cohesive force: Also included is a soaking liquid, which is composed of the following components in parts by weight: Methyl pyrrolidone 20-50 parts ETFE resin 1-5 parts SBS resin 3-10 parts 1-5 parts of petroleum tackifying resin 100 parts of low boiling point low grade solvent.

8. A coating liquid with high cohesive force for a kind of ETFE film according to claim 7, characterized in that: The low-boiling-point low-grade solvent is one or more of methylcyclohexane, cyclohexane, normal hexane or petroleum ether.

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