Modified hydrocarbon liquid film removing and degumming agent, preparation method and application thereof

Abstract

This invention discloses a modified hydrocarbon liquid film-removing and adhesive-removing agent, its preparation method, and its application. The formulation of this invention is rational, using a pure hydrocarbon system as a base. It softens the aged adhesive layer through a polar penetration aid and adds a hydrocarbon-compatible low-surface-tension stripping agent and an anti-redeposition agent. This rapidly softens the cross-linked adhesive layer at room temperature or low temperature, achieving complete peeling of the protective film without residue or substrate damage. It effectively overcomes the shortcomings of traditional hydrocarbon solvents, such as weak penetration and slow adhesive removal of aged adhesive layers. Simultaneously, it retains the safe and environmentally friendly characteristics of the hydrocarbon system, including non-toxicity, non-corrosiveness, non-swelling of the film, and high flash point. It comprehensively solves the defects of water-based, strong solvents, and ordinary hydrocarbons, achieving efficient, complete film peeling at room temperature, without residue or damage to the substrate—an industrial-grade film removal effect. It is not only suitable for new films but also excels at treating stubborn protective films after high-temperature baking and UV aging. It has a wide range of applications and extremely high economic and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology, and in particular to a modified hydrocarbon liquid film remover, its preparation method, and its application. Background Technology

[0002] In the metal processing, home appliance panel, building decoration, and automotive manufacturing industries, metal sheets are often covered with protective films to prevent scratches. However, when the protective film undergoes long-term storage, high-temperature transportation, or outdoor exposure, or is subjected to machining processes such as stamping with the film on, the adhesive layer undergoes deep cross-linking and curing. The protective film becomes embedded in the indentation, leading to the following problems:

[0003] Limitations of traditional water-based cleaning agents: Water-based systems have high surface tension, making it difficult to penetrate into the hydrophobic aged adhesive layer, resulting in low adhesive removal efficiency and slow drying, which can easily lead to metal rusting.

[0004] Risks of traditional strong solvents: Chlorinated solvents (such as dichloromethane) are highly toxic and strictly restricted by regulations; solvents containing benzene and ketones, although strong in dissolving power, can easily swell PE / PET films, leading to breakage, and may corrode certain coatings or cause stress cracking in aluminum alloys.

[0005] The shortcomings of common hydrocarbon solvents: Although common hydrocarbon solvents (such as kerosene and ordinary white spirit) are safe and metal-friendly, their solubility parameters are not well matched with the aging and cross-linking acrylate adhesives, and their penetration speed is slow. They often require long-term soaking or high-temperature heating, which cannot meet the high-efficiency requirements of modern production lines.

[0006] Therefore, the development of a modified film remover based on a hydrocarbon system that can maintain low toxicity, not damage the substrate, not swell the film, and can quickly penetrate and efficiently remove the aged adhesive layer is an urgent need in the industry. Summary of the Invention

[0007] To address the aforementioned shortcomings, the present invention aims to provide a modified hydrocarbon liquid film-removing and adhesive-removing agent, its preparation method, and its application, suitable for removing PE and PET protective films and residual pressure-sensitive adhesives that are difficult to remove from metal surfaces such as stainless steel, aluminum alloy, and copper plates due to high temperature, ultraviolet aging, or long-term storage.

[0008] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0009] A modified hydrocarbon liquid film-removing and adhesive-removing agent, characterized in that it comprises the following components by weight percentage:

[0010] Hydrocarbon primary solvent: 75%–92%;

[0011] Polar penetration enhancer 5%–20%;

[0012] Low surface tension release agent 0.5%–3%;

[0013] Colloidal dispersion anti-redeposition agent 0.5%–2%;

[0014] Antioxidant stabilizer 0.1%–0.5%.

[0015] In a preferred embodiment of the present invention, the hydrocarbon primary solvent is an isoparaffin or n-paraffin with a boiling range between 140℃ and 210℃, and the aromatic hydrocarbon content is <0.1%. More preferably, the hydrocarbon primary solvent is a mixture of C10-C13 isoparaffins, which, as a carrier, provides excellent chemical stability, does not corrode metals such as stainless steel, aluminum alloys, and copper plates, does not cause swelling or damage to protective film materials such as PE and PET, and has low odor, high flash point (>50℃), and good safety.

[0016] In a preferred embodiment of the present invention, the polar penetration enhancer is selected from at least one of d-limonene, terpineol, and fatty acid methyl esters, or a compound with a small amount of low-carbon alcohol ether acetate. Adding the polar penetration enhancer can adjust the solubility parameters of the mixed solvent, making it closer to the cohesive energy density of the aged acrylic adhesive. Utilizing the strong penetrability of terpenes, it quickly penetrates into the adhesive network, disrupting intermolecular forces, softening and swelling the hardened adhesive layer, restoring its viscous flow, and thus facilitating peeling.

[0017] As a preferred embodiment of the present invention, the low surface tension stripping agent is a fluorinated surfactant or modified polysiloxane soluble in hydrocarbon systems, which can reduce the surface tension of the mixture to less than 25 mN / m. It has extremely low surface tension, which can reduce the surface tension of the drug solution, allowing it to spread rapidly on the surface of the hydrophobic protective film and penetrate to the film-adhesive interface, replacing the physical adsorption between the adhesive and the metal, achieving "interface lubrication", and causing the protective film to roll up and fall off in one piece.

[0018] In a preferred embodiment of the present invention, the colloidal dispersion anti-redeposition agent is an oil-soluble hydrogenated castor oil derivative, polyisobutylene, or a specialty wax. Once the adhesive layer is peeled off, this component immediately encapsulates the adhesive particles and film fragments, preventing them from re-adhering to the smooth metal surface or clogging the spray nozzles.

[0019] In a preferred embodiment of the present invention, the antioxidant stabilizer is BHT (2,6-di-tert-butyl-p-cresol) or a vitamin E derivative. The antioxidant stabilizer prevents the hydrocarbon solvent and terpene adjuvants from oxidizing and deteriorating during storage or use, thus extending the shelf life of the pharmaceutical solution.

[0020] A method for preparing the modified hydrocarbon liquid film-removing and adhesive-removing agent includes the following steps:

[0021] (1) Premixing: At room temperature, the polar penetration aid and the low surface tension stripper are mixed in a predetermined ratio and stirred until transparent to obtain a premixed liquid; the premixing step ensures compatibility;

[0022] (2) Main solvent dilution: Add the metered amount of hydrocarbon main solvent to the reaction vessel and stir, preferably using low-speed stirring;

[0023] (3) Compounding: Add the premixed solution to the reaction vessel and the hydrocarbon main solvent, and stir continuously for 20-30 minutes;

[0024] (4) Addition of functional agents: Add colloidal dispersion anti-redeposition agent and antioxidant stabilizer in sequence, and continue to stir until the system is completely clear and transparent without layering, and obtain modified hydrocarbon liquid film removal and descaling agent.

[0025] As a preferred embodiment of the present invention, it further includes step (5) filtration and packaging: after filtering the modified hydrocarbon liquid membrane remover, such as by using a 1μm precision filter, to remove impurities, insoluble particles, etc., it is then packaged.

[0026] The modified hydrocarbon liquid film remover or the modified hydrocarbon liquid film remover prepared by the preparation method described above is used for removing adhesive from aging PE, PET, PVC protective films and pressure-sensitive adhesives on metal surfaces.

[0027] The beneficial effects of this invention are as follows: The formulation of this invention is reasonable, using a pure hydrocarbon system as its base. It is non-corrosive to metals such as stainless steel, aluminum, and copper, and will not cause hydrogen embrittlement or stress cracking. It does not cause swelling or whitening of protective films such as PE and PET, maintaining the integrity of the film. By using a polar penetration aid to soften the aged adhesive layer, and adding a hydrocarbon-compatible low-surface-tension stripping agent and an anti-redeposition agent, the low-surface-tension stripping agent achieves rapid interfacial penetration and peeling, the anti-redeposition agent prevents secondary contamination, and the antioxidant extends the film's lifespan. This rapidly softens the cross-linked adhesive layer at room temperature or low temperature, achieving complete peeling of the protective film without residue or substrate damage. This effectively overcomes the shortcomings of traditional hydrocarbon solvents, such as weak penetration and slow adhesive removal of aged adhesive layers, while retaining the safety and environmental friendliness of the hydrocarbon system, which is non-toxic, non-corrosive, does not cause swelling, and has a high flash point. Its characteristics comprehensively solve the shortcomings of water-based, strong solvents, and ordinary hydrocarbons, achieving an industrial-grade film removal effect that is efficient at room temperature, removes the entire film, leaves no residue, and does not damage the substrate. It ensures that the metal surface is clean after adhesive removal with very little residue, and the trace oil film that remains is easily removed by subsequent conventional degreasing processes. It is not only suitable for new films, but also excels at handling stubborn protective films that have undergone high-temperature baking and UV aging. It has a wide range of applications and can be widely used in the fields of metal sheet processing and product manufacturing. The waste liquid can be distilled and recycled, which has extremely high economic value and environmental benefits. Detailed Implementation

[0028] Example 1: This example provides a modified hydrocarbon liquid film-removing and adhesive-removing agent and its preparation method. The preparation method includes the following steps:

[0029] (1) Premixing: Prepare the following components by weight percentage: hydrocarbon main solvent 82%; polar penetration aid 15%; low surface tension stripping agent 1.5%; colloidal dispersion anti-redeposition agent 1%; antioxidant stabilizer 0.5%. In this embodiment, the hydrocarbon main solvent is preferably a C11-C13 isoalkanes (boiling range 160-180℃). The polar penetration aid is preferably d-limonene 10% and fatty acid methyl ester (C8-C10) 5%. The low surface tension stripping agent is preferably a fluorinated surfactant (hydrocarbon compatible type), the colloidal dispersion anti-redeposition agent is preferably a hydrogenated castor oil derivative, and the antioxidant stabilizer is preferably a BHT antioxidant. At room temperature, the polar penetration aid and the low surface tension stripping agent are mixed in a predetermined ratio and stirred until transparent to obtain a premixed liquid; the premixing step ensures compatibility.

[0030] (2) Main solvent dilution: Add the metered amount of hydrocarbon main solvent to the reaction vessel and stir, preferably using low-speed stirring;

[0031] (3) Compounding: Add the premixed solution to the reaction vessel and the hydrocarbon main solvent, and stir continuously for 20-30 minutes;

[0032] (4) Addition of functional agents: Add colloidal dispersion anti-redeposition agent and antioxidant stabilizer in sequence, and continue stirring for about 30 minutes until the system is completely clear and transparent without layering, and obtain modified hydrocarbon liquid film removal and descaling agent.

[0033] (5) Filtration and packaging: The modified hydrocarbon liquid membrane remover is filtered using a 1μm precision filter and then packaged.

[0034] Performance testing:

[0035] Target: 304 stainless steel sheet stored outdoors for 18 months; the PE film has become brittle and will break easily when torn by hand.

[0036] Method: Immerse or spray at room temperature (25℃) and let stand for 5 minutes.

[0037] Results: The protective film edges automatically lifted, and the entire film could be peeled off completely with gentle pulling, without breakage. The metal surface was shiny, without residual adhesive or watermarks. Therefore, the modified hydrocarbon liquid film remover prepared in this embodiment is mainly used for removing aging PE films from stainless steel / aluminum plates and is a general-purpose agent.

[0038] Example 2: This example provides a modified hydrocarbon liquid film-removing and adhesive-removing agent and its preparation method, which is basically the same as that in Example 1, except that the components prepared by weight percentage are different: hydrocarbon main solvent 76%; polar penetration aid 20%; low surface tension stripping agent 2%; colloidal dispersion anti-redeposition agent 1.5%; antioxidant stabilizer 0.5%. In this example, the hydrocarbon main solvent is preferably n-alkanes (boiling range 190-210℃). The polar penetration aid is preferably terpineol 12%. The low surface tension stripping agent is preferably propylene glycol methyl ether acetate (PMA) 8%, the colloidal dispersion anti-redeposition agent is preferably polyisobutylene (molecular weight 2000), and the antioxidant stabilizer is preferably a vitamin E derivative.

[0039] Performance testing:

[0040] Object: Aluminum alloy plate that has undergone heat treatment at 80℃ for 2 hours, with severe cross-linking of the rubber-based pressure-sensitive adhesive.

[0041] Method: Soak at 40℃ and let stand for 3 minutes.

[0042] Results: The adhesive layer softened and swelled rapidly, and the film peeled off completely. No corrosion spots or whitening were observed on the aluminum surface. Therefore, the modified hydrocarbon liquid film remover prepared in this embodiment is primarily used for removing heavily cross-linked rubber adhesives and is a powerful agent.

[0043] Example 3: This example provides a modified hydrocarbon liquid film remover and its preparation method, which is basically the same as that in Example 1, except that the components prepared by weight percentage are different: hydrocarbon main solvent 75%; polar penetration aid 20%; low surface tension stripping agent 3%; colloidal dispersion anti-redeposition agent 1.6%; antioxidant stabilizer 0.4%.

[0044] Example 4: This example provides a modified hydrocarbon liquid film remover and its preparation method, which is basically the same as that in Example 1, except that the components prepared by weight percentage are different: hydrocarbon main solvent 92%; polar penetration aid 6.9%; low surface tension stripping agent 0.5%; colloidal dispersion anti-redeposition agent 0.5%; antioxidant stabilizer 0.1%.

[0045] Example 5: This example provides a modified hydrocarbon liquid film remover and its preparation method, which is basically the same as that in Example 1, except that the components prepared by weight percentage are different: hydrocarbon main solvent 92%; polar penetration aid 5%; low surface tension stripping agent 1%; colloidal dispersion anti-redeposition agent 1.6%; antioxidant stabilizer 0.4%.

[0046] Comparative Example 1 (pure hydrocarbon solvent), composition: 100% C11-C13 isoalkanes.

[0047] Results: After soaking for 30 minutes, the adhesive layer only swelled slightly and could not be peeled off. Forcibly removing it left a large amount of adhesive residue. This proves that simple hydrocarbon solvents have insufficient penetration power for aged adhesives.

[0048] Comparative Example 2 (conventional chlorinated solvent), composition: 100% dichloromethane.

[0049] Results: The adhesive was removed quickly, but the PE film swelled and cracked severely, making it impossible to peel off the entire sheet; the odor at the operation site was pungent, and the aluminum surface showed slight corrosion and loss of gloss.

[0050] Comparative Example 3 (water-based alkaline cleaning agent), composition: 5% NaOH + surfactant + water.

[0051] Results: The solution failed to wet the hydrophobic film surface, and there was no obvious effect after soaking for 1 hour. In addition, the aluminum surface turned black due to oxidation.

[0052] Based on the above results, the modified hydrocarbon liquid film remover of this invention can rapidly wet, deeply penetrate, and peel off the aged protective film on metal surfaces, solving the problems of slow removal by traditional hydrocarbon solvents and damage to the substrate by ordinary solvents. In summary, this invention has the following advantages:

[0053] 1. Highly efficient adhesive removal: Compared to pure hydrocarbon solvents, the adhesive removal speed is increased by 3-5 times. For "dead adhesive" that has been aged for more than 2 years, the entire film can be peeled off by soaking at room temperature for 5-10 minutes or spraying for 2 minutes.

[0054] 2. Zero damage to substrate: The pure hydrocarbon system has absolutely no corrosion to metals such as stainless steel, aluminum, and copper, and will not cause hydrogen embrittlement or stress cracking; it does not cause swelling or whitening of PE / PET films, maintaining the integrity of the film.

[0055] 3. Safe and environmentally friendly: Free of halogens, benzene, ketones and strong polar solvents. Although VOCs are present, their toxicity is extremely low (non-carcinogenic and non-teratogenic). It has a mild odor, a high flash point, and a low fire risk. Waste liquid can be recycled and regenerated by distillation.

[0056] 4. No residue and easy to clean: The unique anti-redeposition technology ensures that the metal surface is clean after degumming with very little residue, and the trace oil film that remains is easily removed by subsequent conventional degreasing processes.

[0057] 5. Wide applicability: Not only suitable for new films, but also better at handling stubborn protective films that have been baked at high temperatures and aged by ultraviolet rays.

[0058] The above embodiments are merely preferred embodiments of the present invention. The present invention cannot list all embodiments. Any technical solution that adopts one of the above embodiments, or any equivalent changes made based on the above embodiments, are within the protection scope of the present invention.

[0059] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention. Other methods, products, and applications obtained by using the same or similar methods are all within the protection scope of the present invention.

Claims

1. A modified hydrocarbon liquid film-removing and adhesive-removing agent, characterized in that: By weight percentage, it includes the following components: Hydrocarbon primary solvent: 75%–92%; Polar penetration enhancer 5%–20%; Low surface tension release agent 0.5%–3%; Colloidal dispersion anti-redeposition agent 0.5%–2%; Antioxidant stabilizer 0.1%–0.5%.

2. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The hydrocarbon main solvent is an isoparaffin or n-paraffin with a boiling range between 140℃ and 210℃, and the aromatic content is <0.1%.

3. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The hydrocarbon main solvent is a mixture of C10-C13 isoalkanes.

4. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The polar penetration enhancer is selected from at least one of d-limonene, terpineol, and fatty acid methyl esters, or a compound with a small amount of low-carbon alcohol ether acetate.

5. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The low surface tension stripping agent is a fluorinated surfactant or modified polysiloxane that is soluble in hydrocarbon systems, which can reduce the surface tension of the mixture to below 25 mN / m.

6. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The colloidal dispersion anti-redeposition agent is an oil-soluble hydrogenated castor oil derivative, polyisobutylene, or a special wax.

7. The modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: The antioxidant stabilizer is BHT or a vitamin E derivative.

8. A method for preparing the modified hydrocarbon liquid film-removing and adhesive-removing agent according to any one of claims 1-7, characterized in that, It includes the following steps: (1) Premixing: The polar penetration aid and the low surface tension stripping agent are mixed in a predetermined ratio to obtain a premixed solution; (2) Main solvent dilution: Add the metered amount of hydrocarbon main solvent to the reaction vessel and stir; (3) Compounding: The premixed solution is added to the reaction vessel and the hydrocarbon main solvent, and stirred continuously; (4) Addition of functional agents: Add colloidal dispersion anti-redeposition agent and antioxidant stabilizer in sequence, and continue to stir evenly to obtain modified hydrocarbon liquid film removal and adhesive removal agent.

9. The preparation method of the modified hydrocarbon liquid film-removing and adhesive-removing agent according to claim 1, characterized in that: It also includes step (5) filtration and packaging: the modified hydrocarbon liquid membrane remover is filtered and then packaged.

10. The application of a modified hydrocarbon liquid film remover and adhesive remover according to any one of claims 1-7, or a modified hydrocarbon liquid film remover and adhesive remover prepared by the preparation method of the modified hydrocarbon liquid film remover and adhesive remover according to claim 8 or 9, in removing adhesive from aging PE, PET, PVC protective films and pressure-sensitive adhesives on metal surfaces.