Aluminum alloy deinking agent and its preparation method and application

Abstract

The present invention discloses an aluminum alloy deinking agent, a preparation method thereof, and an application thereof. It relates to the technical field of deinking agents. The above-mentioned deinking agent includes the following components: sodium methyl silicate; alkoxypropylamine; diol; anti-re-adhesion agent; solvent. Sodium methyl silicate, as a strong alkaline component, can provide an alkaline environment to decompose the organic components in the ink. At the same time, alkoxypropylamine, as a penetrant, can penetrate into the gap between the ink and the aluminum alloy surface. The synergistic effect of these two components increases the contact area between the deinking agent and the ink and promotes their interaction, thereby accelerating the detachment and removal of the ink. The presence of diol increases the deinking agent's ability to dissolve the ink, and the polysaccharide structure in the anti-re-adhesion agent can form an interface isolation layer, reduce the interaction force between the ink and the aluminum alloy surface, and prevent the ink from re-adhering. The two further promote the effect of the above-mentioned synergistic effect.

Description

Technical Field

[0001] The present invention relates to the technical field of deinking agents, in particular to an aluminum alloy deinking agent and a preparation method and application thereof. Background Art

[0002] Aluminum alloys, with their low density, high strength, and strong plasticity, are widely used in various fields. Aluminum alloys are widely used in the metal casings of 3C electronics. Brand labels are often applied to aluminum alloy casings using screen printing inks. During screen printing on aluminum alloy surfaces, defects are inevitable due to various process factors. Grease, dirt, oxides, or other impurities on the aluminum alloy surface can interfere with ink adhesion and curing, resulting in defective products. Furthermore, using an unsuitable ink type or low-quality ink can also result in defective products. For example, issues such as insufficient ink adhesion, inappropriate curing speed, or poor pigment stability can lead to poor print quality. The selection, quality, and preparation of the screen can also affect the results. Improper screen selection, damage, aging, or overstretching can lead to uneven ink application, distorted printing, or blurred patterns. Furthermore, excessively thick or thin ink layers can also result in defective products. Too thick an ink layer may cause blurring, sticking, or ink leakage, while too thin an ink layer may result in incomplete patterns or weak colors. In order to reduce material costs, defective products after screen printing ink removal need to be de-inked so that they can be reused.

[0003] Currently, deinking agents containing large amounts of volatile organic solvents are commonly used in the market for deinking under heated conditions. These deinking agents offer advantages such as good deinking effectiveness and rapid deinking. However, these agents, containing large amounts of volatile organic compounds, are not only flammable and explosive under heated conditions, but also significantly reduce deinking capacity as the solvent evaporates, resulting in unstable deinking results. Furthermore, high levels of organic solvents do not meet the volatile organic compound content limits for cleaning agents specified in GB38508-2020.

[0004] Therefore, it is urgent to develop a new type of aluminum alloy deinking agent to solve the above problems. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is:

[0006] A deinking agent is provided.

[0007] The second technical problem to be solved by the present invention is:

[0008] Provided is a method for preparing the deinking agent.

[0009] The third technical problem to be solved by the present invention is:

[0010] Application of the deinking agent.

[0011] The present invention also provides a room-temperature aluminum alloy deinking agent, comprising the deinking agent.

[0012] In order to solve the first technical problem, the technical solution adopted by the present invention is:

[0013] A deinking agent comprising the following components:

[0014] Sodium methyl silicate;

[0015] Alkoxypropylamine;

[0016] diols;

[0017] Anti-sticking agent;

[0018] solvent.

[0019] According to the embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0020] The main components of conventional deinking agents are volatile organic solvents and alkalis. The present invention abandons volatile substances and innovatively uses sodium methyl silicate as the strong alkaline component in the deinking agent of the present invention. It releases hydroxide ions (OH - ), thereby increasing the alkalinity of the solution. Alkaline conditions help to destroy the chemical bonds between the ink and the surface of the aluminum alloy, and decompose organic substances such as esters and amides into corresponding alcohols, acid salts or amine salts. Such alkaline hydrolysis reactions can destroy the structure of the ink, causing it to lose its adhesion to the surface of the aluminum alloy, thereby promoting the desorption of the ink from the surface of the aluminum alloy, so that it still has a good deinking effect when deinking at room temperature (around 25°C), and is non-corrosive to the aluminum alloy. In addition, sodium methyl silicate also has good surface activity, which can reduce the surface tension between the liquid and the solid surface, thereby improving the permeability and wettability of the liquid on the solid surface. This allows the deinking agent to better contact the aluminum alloy surface and ink, increase the contact area with them, and thus improve the deinking effect.

[0021] Furthermore, the deinking agent of the present invention also comprises an alkoxypropylamine component. Its molecular structure contains ether, amine, and alkoxy groups. The alkoxy groups can interact with organic components in the ink, causing them to dissolve, disperse, or chemically react. The amine groups are lipophilic and can form chemical bonds with metal oxides on the aluminum alloy surface, enhancing adhesion to the surface. The ether groups enable the alkoxypropylamine to effectively penetrate into the gaps between the ink and the aluminum alloy, assisting in the removal of the ink from the aluminum alloy surface. The combination of these three structural units enables the alkoxypropylamine to interact simultaneously with both the ink and the aluminum alloy surface. Furthermore, the alkoxypropylamine has low surface tension and high wettability, enabling it to quickly diffuse and penetrate into the tiny gaps between the ink and the aluminum alloy surface. This penetrating property allows the alkoxypropylamine to contact the ink-covered aluminum alloy surface and penetrate the interface between the ink and the aluminum alloy. Furthermore, the alkoxypropylamine is an organic solvent with a certain degree of solubility. It can dissolve and disperse the organic components in the ink, causing them to lose adhesion and become easier to remove. In addition, alkoxypropylamine also has a certain surface activity, which can improve the interaction between ink and aluminum alloy surface, reduce interfacial energy, and thus promote the desorption of ink.

[0022] Furthermore, the deinking agent of the present invention also includes a glycol component. This glycol exhibits excellent chemical solubility and high permeability, allowing it to swell the ink while also assisting in the removal of the ink from the aluminum alloy surface. The combination of sodium methyl silicate, alkoxypropylamine, and isohexanediol creates a significant synergistic effect, allowing the ink on the aluminum alloy surface to be removed at room temperature.

[0023] Furthermore, the deinking agent of the present invention also includes an anti-adhesion agent containing a polysaccharide structure. The polysaccharide structure in the anti-adhesion agent can regulate the wettability between the liquid and the solid surface. When applied to the aluminum alloy surface, it forms a uniform wetting film, reducing the surface tension between the liquid and the ink. The formation of this wetting film helps prevent the ink from re-adhering to the aluminum alloy surface, reducing the possibility of re-adhesion and making it less likely that the detached ink will adhere to the aluminum alloy surface, thereby preventing it from re-adhering to the aluminum alloy substrate surface. Furthermore, during the deinking process, the polysaccharide structure forms a protective film or interfacial barrier on the aluminum alloy surface. This barrier layer reduces the interaction between the ink and the aluminum alloy substrate, preventing ink molecules from firmly adhering to the surface. By blocking direct contact between ink molecules and the substrate, the anti-adhesion agent effectively prevents ink from re-adhering to the aluminum alloy surface. Furthermore, the polysaccharide structure can interact with organic components in the ink, such as forming hydrogen bonds or other chemical bonds. These interactions can alter the surface properties of the ink, reducing its adhesion and making it difficult for it to firmly bond to the aluminum alloy surface. The anti-adhesion agent interacts with the ink molecules and prevents them from reattaching to the aluminum alloy surface.

[0024] In summary, the deinking agent of the present invention includes sodium methyl silicate, alkoxypropylamine, diol and anti-rebonding agent, and there is a synergistic effect between the components. Among them, sodium methyl silicate, as a strong alkaline component, can provide an alkaline environment to decompose the organic components in the ink. At the same time, alkoxypropylamine, as a penetrant, can penetrate into the gap between the ink and the surface of the aluminum alloy. The synergistic effect of these two components increases the contact area between the deinking agent and the ink and promotes their interaction, thereby accelerating the detachment and removal of the ink. The presence of diol increases the deinking agent's ability to dissolve the ink, and the polysaccharide structure in the anti-rebonding agent can form an interfacial isolation layer, reducing the interaction force between the ink and the aluminum alloy surface and preventing the ink from re-adhering. The two further promote the effect of the above-mentioned synergistic effect.

[0025] According to one embodiment of the present invention, the deinking agent comprises the following components in parts by weight:

[0026] 3-8 parts of sodium methyl silicate;

[0027] 2-10 parts of alkoxypropylamine;

[0028] 10-20 parts of diol;

[0029] 0.2-1 part of anti-sticking agent;

[0030] 60-80 parts of solvent.

[0031] According to one embodiment of the present invention, the alkoxypropylamine includes at least one of butoxypropylamine, hexyloxypropylamine, octyloxypropylamine, dodecyloxypropylamine and hexadecyloxypropylamine.

[0032] According to one embodiment of the present invention, the diol includes at least one of isohexanediol and pentanediol.

[0033] According to one embodiment of the present invention, the anti-re-sticking agent includes at least one of agar powder and carrageenan.

[0034] According to one embodiment of the present invention, the solvent includes at least one of water and ethanol.

[0035] In order to solve the second technical problem, the technical solution adopted by the present invention is:

[0036] A method for preparing the deinking agent comprises the following steps:

[0037] A solvent and an anti-re-sticking agent are mixed and subjected to heat treatment to obtain a mixture, and sodium methyl silicate, alkoxypropylamine and diol are added to the mixture to obtain the deinking agent.

[0038] According to the embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0039] The purpose of adding the solvent is to dissolve or disperse the other components therein to form a uniform deinking agent solution. After the solvent is added, the anti-re-sticking agent is added to better control its dissolution and dispersion. Addition under stirring conditions can ensure that the anti-re-sticking agent is evenly dispersed in the solvent to form a stable system. The step of heating treatment may be to promote the reaction and increase solubility. Heating can increase the frequency and energy of collisions between molecules, thereby promoting the reaction rate and reaction efficiency. A sufficiently long holding time can allow the reaction to proceed fully, help dissolve or disperse the components, and ensure that the reaction achieves the desired effect. The present invention limits the order of addition of sodium methyl silicate, alkoxypropylamine and diol to control the interaction and reaction process of each component. The order of addition of different components may affect the interaction mode and effect between them, and affect the improvement of the deinking effect.

[0040] According to one embodiment of the present invention, the heating temperature of the heat treatment is 80-90°C.

[0041] According to one embodiment of the present invention, the heating treatment further includes a step of keeping warm for 30-60 minutes.

[0042] Another aspect of the present invention provides a room-temperature aluminum alloy deinking agent. The deinking agent includes the deinking agent described in the first embodiment. Because this application utilizes all of the technical solutions of the above-described deinking agent, it possesses at least all of the beneficial effects of the technical solutions of the above-described embodiment.

[0043] According to one embodiment of the present invention, the above-mentioned room temperature aluminum alloy deinking agent is used as follows:

[0044] Place the aluminum alloy that needs to be deinked in a deinking agent at room temperature and ultrasonicate for 10-30 minutes. After all the ink is removed, rinse it twice with pure water and then dry it to complete the deinking operation.

[0045] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0046] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the embodiment, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] The terms "preferably," "more preferably," and the like, used herein refer to embodiments of the present invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the present invention.

[0049] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are understood to include any and all subranges subsumed therein.

[0050] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of the present invention.

[0051] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0052] Example 1

[0053] A deinking agent comprising the following components in parts by weight:

[0054]

[0055] The preparation of the above-mentioned deinking agent comprises the following steps:

[0056] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0057] The deinking agent of Example 1 comprises sodium methyl silicate, butoxypropylamine, isohexanediol and agar powder.

[0058] Among them, sodium methyl silicate dissociates into methyl silicate ions and sodium ions (Na + Methyl silicate ions react with aluminum oxide on the aluminum alloy surface to form a protective layer of aluminum hydroxide (Al(OH)3). The formation of aluminum hydroxide changes the chemical properties and charge characteristics of the aluminum alloy surface, weakening the interaction between ink particles and the aluminum alloy surface, thereby promoting the detachment of the ink.

[0059] The alkoxy groups in butoxypropylamine interact with ink particles through electrostatic and intermolecular forces. They penetrate into microscopic gaps between the ink and the aluminum alloy surface and interact with the organic components of the ink molecules. These interactions, which may include hydrogen bonding, van der Waals forces, and electrostatic interactions, weaken the adhesion of the ink molecules to the aluminum alloy surface and help separate the ink from the surface.

[0060] Agar powder is a polysaccharide compound with adhesiveness and gel-forming properties. When added to the deinking agent, it forms a gel structure under stirring, forming a sticky film-like substance. This gel adheres to the aluminum alloy surface, increasing the deinking agent's durability on the surface, allowing it to interact with the ink for a longer period of time and improving the deinking effect.

[0061] The isohexanediol molecule contains two hydroxyl groups (OH), which can form hydrogen bonds or other interactions with the organic components in the ink. These interactions can change the structure and solubility of the ink molecules, causing them to lose their adhesion to the aluminum alloy surface, thereby promoting the detachment of the ink.

[0062] The interactions among these four components act synergistically to promote the separation and removal of ink from the aluminum alloy surface by changing the chemical properties of the aluminum alloy surface, penetrating microscopic gaps, forming a gel structure, and interacting with ink molecules.

[0063] Example 2

[0064] A deinking agent comprising the following components in parts by weight:

[0065]

[0066] The preparation of the above-mentioned deinking agent comprises the following steps:

[0067] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0068] Compared with the deinking agent component of Example 1, in Example 2, butoxypropylamine is replaced by hexyloxypropylamine. Compared with butoxypropylamine, hexyloxypropylamine has a longer carbon chain length. The long carbon chain of hexyloxypropylamine may increase its permeability and interaction ability with ink molecules, thereby improving the deinking effect.

[0069] Compared to the deinking agent components of Example 1, in Example 2, agar powder is replaced with carrageenan. Carrageenan is a polysaccharide compound that may have different viscosity and gel-forming ability compared to agar powder. Carrageenan may form different gel structures in the deinking agent, which may have different effects on the deinking effect. Among them, carrageenan can form a stable gel structure in the deinking agent, which helps maintain the stability of the deinking agent. By increasing the viscosity and stickiness of the deinking agent, carrageenan can maintain the uniform dispersion of the deinking agent components and prevent their precipitation or separation. This helps maintain the effective concentration of sodium methyl silicate and ensure its effect in the deinking agent.

[0070] Furthermore, there may be a synergistic effect between hexyloxypropylamine and sodium methyl silicate. The aluminum hydroxide protective layer formed by sodium methyl silicate can change the chemical properties of the aluminum alloy surface, reducing the adhesion of ink particles to the aluminum alloy surface. The penetration and intermolecular interaction of hexyloxypropylamine can further enhance this effect. It can penetrate into the microscopic gaps between the ink and the aluminum alloy surface, interact with the ink molecules, and enhance the separation of the ink from the aluminum alloy surface. In addition, the alkoxy group in hexyloxypropylamine has the ability to interact with ink molecules. The alkoxy group can form hydrogen bonds, van der Waals forces, and electrostatic interactions with the organic components of the ink molecules. Through these interactions, hexyloxypropylamine can form relatively weak interactions with the ink molecules, weakening the adhesion of the ink molecules to the aluminum alloy surface and helping to separate the ink from the surface.

[0071] Example 3

[0072] A deinking agent comprising the following components in parts by weight:

[0073]

[0074] The preparation of the above-mentioned deinking agent comprises the following steps:

[0075] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, octyloxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0076] Example 3 is relative to Example 1, except that the hexyloxypropylamine in Example 1 is replaced by octyloxypropylamine.

[0077] Compared to butoxypropylamine, octyloxypropylamine has a longer carbon chain length. This results in slightly different performance in terms of permeability. The longer carbon chain of octyloxypropylamine increases its permeability, allowing it to better penetrate into the gap between the ink and the aluminum alloy surface, thereby improving deinking.

[0078] Furthermore, octyloxypropylamine exhibits a synergistic effect with sodium methyl silicate and agar powder. The protective aluminum hydroxide layer formed by sodium methyl silicate modifies the chemical properties of the aluminum alloy surface, reducing the adhesion of ink particles to the aluminum alloy surface. The permeability and intermolecular interactions of octyloxypropylamine further enhance this effect. It penetrates into the gaps between the ink and the aluminum alloy surface, interacting with ink molecules and strengthening the separation between the two surfaces. Agar powder, as an anti-re-adhesion agent, forms a gel structure, increasing the durability of the deinking agent on the aluminum alloy surface and providing a viscous barrier to prevent the ink from re-adhering to the aluminum alloy.

[0079] Example 4

[0080] A deinking agent comprising the following components in parts by weight:

[0081]

[0082] The preparation of the above-mentioned deinking agent comprises the following steps:

[0083] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, dodecyloxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0084] Example 4 is relative to Example 1, except that the hexyloxypropylamine in Example 1 is replaced by dodecyloxypropylamine.

[0085] The alkoxy groups in dodecyloxypropylamine can interact with the organic components of ink molecules through intermolecular interactions. These interactions may include hydrogen bonding, van der Waals forces, and electrostatic interactions. Through these interactions, dodecyloxypropylamine can form relatively weak interactions with ink molecules, weakening the adhesion of ink molecules to the aluminum alloy surface and helping to separate the ink from the surface.

[0086] Example 5

[0087] A deinking agent comprising the following components in parts by weight:

[0088]

[0089] The preparation of the above-mentioned deinking agent comprises the following steps:

[0090] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and pentanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0091] Example 6

[0092] A deinking agent comprising the following components in parts by weight:

[0093]

[0094]

[0095] The preparation of the above-mentioned deinking agent comprises the following steps:

[0096] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0097] Example 7

[0098] A deinking agent comprising the following components in parts by weight:

[0099]

[0100] The preparation of the above-mentioned deinking agent comprises the following steps:

[0101] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0102] Example 8

[0103] A deinking agent comprising the following components in parts by weight:

[0104]

[0105] The preparation of the above-mentioned deinking agent comprises the following steps:

[0106] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0107] Example 9

[0108] A deinking agent comprising the following components in parts by weight:

[0109]

[0110] The preparation of the above-mentioned deinking agent comprises the following steps:

[0111] First, add water, then add agar powder under stirring, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0112] Comparative Example 1

[0113] A deinking agent comprising the following components in parts by weight:

[0114]

[0115] The preparation of the above-mentioned deinking agent comprises the following steps:

[0116] First add water, then add agar powder under stirring, heat to 85°C and keep warm for 45 minutes, then add sodium silicate, butoxypropylamine and isohexanediol in sequence, stir evenly to obtain the deinking agent.

[0117] Comparative Example 2

[0118] A deinking agent comprising the following components in parts by weight:

[0119]

[0120] The preparation of the above-mentioned deinking agent comprises the following steps:

[0121] First add water, then add agar powder under stirring, heat to 85°C and keep warm for 45 minutes, then add sodium methyl silicate and isohexanediol in sequence, stir evenly to obtain the deinking agent.

[0122] Comparative Example 3

[0123] A deinking agent comprising the following components in parts by weight:

[0124]

[0125] The preparation of the above-mentioned deinking agent comprises the following steps:

[0126] First add water, then add agar powder under stirring, heat to 85°C and keep warm for 45 minutes, then add sodium methyl silicate and butoxypropylamine in sequence, stir evenly to obtain the deinking agent.

[0127] Comparative Example 4

[0128] A deinking agent comprising the following components in parts by weight:

[0129]

[0130] The preparation of the above-mentioned deinking agent comprises the following steps:

[0131] First, add water, heat to 85° C. and keep warm for 45 minutes, then add sodium methyl silicate, butoxypropylamine and isohexanediol in sequence, and stir evenly to obtain the room temperature aluminum alloy deinking agent of the present invention.

[0132] Performance testing:

[0133] The deinking effects of the deinking agents prepared in Examples 1-2 and Comparative Examples 1-4 were tested, and the test results are shown in Table 1.

[0134] Test Method: Ten aluminum alloy plates with screen-printed ink (after curing) on ​​their surfaces were placed in a beaker containing 1000 parts of deinking agent. Ultrasonic treatment was performed at room temperature (25°C) for 20 minutes. The plates were then removed and rinsed twice with pure water. The plates were inspected for ink residue. If no residue remained, the plates were considered qualified. If the original ink layer on the plate was not completely removed, the deinking was considered incomplete. If ink remained on the plate in areas other than the previously cured ink, it was considered to be ink adhesion.

[0135] Table 1 Test results comparison table

[0136]

[0137]

[0138] It can be seen from Table 1 that Examples 1 and 2 can both effectively deink and the ink does not become sticky.

[0139] Comparing Example 1 with Comparative Example 1, sodium methyl silicate has a better deinking effect than sodium silicate at room temperature. Comparing Example 1 with Comparative Examples 2 and 3, it can be found that alkoxypropylamine and isohexanediol are indispensable in the formula and directly affect the deinking effect.

[0140] It can be concluded from Example 1 and Comparative Example 4 that the anti-re-adhesion agent can effectively prevent the ink from adhering to the aluminum alloy surface, thereby preventing the ink from adhering to the surface of the aluminum alloy substrate.

[0141] The room-temperature aluminum alloy deinking agent of the present invention can remove the ink on the surface of the aluminum alloy without heating. On the basis of reducing energy consumption, it also greatly reduces the volatilization of organic solvents in the deinking agent, thereby being more environmentally friendly and having high practical application value.

[0142] The results of Examples 3 to 9 are similar to those of Example 1 and are not shown one by one to avoid redundancy.

[0143] In summary, the deinking agent of the present invention comprises sodium methyl silicate, alkoxypropylamine, diol and anti-re-sticking agent, and the components have a synergistic effect.

[0144] Among them, the sodium ion (Na + ) and silicate ions (SiO3 2- ) dissociates into hydroxide ions (OH - Hydroxyl ions are highly alkaline and can form a hydrate layer with the oxides on the aluminum alloy surface, thereby changing the surface charge characteristics. This reduces the adhesion of ink particles and promotes separation between the ink and the aluminum alloy surface.

[0145] The alkoxy groups in alkoxypropylamine interact with ink particles through electrostatic interactions and intermolecular forces. They penetrate into the microscopic gaps between the ink and the aluminum alloy surface and interact with the organic components of the ink molecules, weakening the adhesion between the ink molecules and the aluminum alloy surface, helping to separate the ink from the surface.

[0146] The polysaccharide structure in the anti-adhesion agent has a ductile and branched molecular chain structure, which can form a protective film or interfacial isolation layer on the aluminum alloy surface. This isolation layer can block direct contact between ink molecules and the aluminum alloy surface, reducing the interaction force and preventing ink particles from firmly adhering to the surface.

[0147] The diol molecule contains two hydroxyl groups (OH), which can form hydrogen bonds or other interactions with organic components in the ink. These interactions can change the structure and solubility of the ink molecules, causing them to lose their adhesion to the aluminum alloy surface, thereby promoting ink desorption.

[0148] In summary, these four components in the room temperature aluminum alloy deinking agent synergistically promote the detachment and removal of ink by changing surface properties, penetrating microscopic gaps, forming an isolation layer and changing the interaction ability of ink molecules.

[0149] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An aluminum alloy deinking agent, characterized in that: Includes the following components: Sodium methyl silicate; Alkoxypropylamine; diols; Anti-sticking agent; water; The anti-re-sticking agent includes at least one of agar powder and carrageenan; Among them, sodium methyl silicate dissociates into methyl silicate ions and sodium ions in water. The methyl silicate ions can react with aluminum oxide on the surface of the aluminum alloy to form an aluminum hydroxide protective layer.

2. The aluminum alloy deinking agent according to claim 1, characterized in that: The deinking agent comprises the following components in parts by weight: 3-8 parts of sodium methyl silicate; 2-10 parts of alkoxypropylamine; 10-20 parts of diol; 0.2-1 part of anti-sticking agent; 60-80 parts of water.

3. The aluminum alloy deinking agent according to claim 1, characterized in that: The alkoxypropylamine includes at least one of butoxypropylamine, hexyloxypropylamine, octyloxypropylamine, dodecyloxypropylamine and hexadecyloxypropylamine.

4. The aluminum alloy deinking agent according to claim 1, characterized in that: The diol includes at least one of isohexanediol and pentanediol.

5. A method for preparing the aluminum alloy deinking agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: Water and an anti-re-sticking agent are mixed and subjected to heating treatment to obtain a mixture, and sodium methyl silicate, alkoxypropylamine and diol are added to the mixture to obtain the deinking agent.

6. The method according to claim 5, characterized in that: The heating temperature of the heating treatment is 80-90°C.

7. The method according to claim 5, characterized in that: The heating treatment further includes a step of keeping the temperature for 30-60 minutes.

Images