Preparation method of hydrophobically modified melamine sponge

Abstract

The invention relates to the technical field of melamine sponge, in particular to a preparation method of hydrophobically modified melamine sponge, which comprises the following preparation steps: step 1, proportionally preparing melamine sponge, a silane coupling agent (KH-570), silicone oil (PDMS), a solvent and a catalyst; step 2, pretreating a melamine sponge raw material; 3, preparing a dipping solution; 4, dipping treatment is conducted, specifically, the dried melamine sponge is dipped into a dipping solution, and it is ensured that the sponge is completely dipped into the solution. The preparation method of the hydrophobic modified melamine sponge provided by the invention is simple, convenient and economical, and not only is the process simplified and the cost reduced, but also the preparation efficiency is improved by optimizing ingredients and preparation steps. The prepared sponge has excellent hydrophobic performance and oil absorption capacity, and is suitable for various application scenes.

Description

Technical Field

[0001] The invention relates to the technical field of melamine sponge preparation, in particular to a method for preparing a hydrophobically modified melamine sponge. Background Art

[0002] Graphene-based oil-absorbing materials have excellent adsorption performance and hydrophobicity. However, the process of preparing graphene is complicated and costly, which limits its large-scale application. The prior art mainly prepares hydrophobic melamine sponges by coating graphene and polydimethylsiloxane (PDMS) nanocomposites on melamine sponge skeletons. Although this method has significant effects, the preparation process is complicated and the cost is high. Therefore, a new method is urgently needed to prepare hydrophobically modified melamine sponges to simplify the process, reduce costs, and maintain or improve their oil absorption performance. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing a hydrophobically modified melamine sponge to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing a hydrophobically modified melamine sponge, comprising the following preparation steps:

[0005] Step 1: Prepare the ingredients of melamine sponge, silane coupling agent (KH-570), silicone oil (PDMS), solvent and catalyst in proportion;

[0006] Step 2: pre-treating the melamine sponge raw material;

[0007] Step 3: Preparation of dipping solution;

[0008] Step 4: Dipping treatment: dip the dried melamine sponge into the dipping solution, making sure the sponge is completely immersed in the solution;

[0009] Step 5: Post-impregnation treatment: Take out the impregnated sponge, gently squeeze it to remove excess solution, and further dry the sponge in a drying oven at 60°C for 4 hours to ensure that the solvent is completely volatilized and promote the bonding of the silane coupling agent and the sponge;

[0010] Step 6: Curing treatment: Place the dried sponge in a heat treatment furnace and heat it at 120°C for 2 hours to further cure the silane coupling agent and the sponge to form a stable hydrophobic layer;

[0011] Step 7: Cooling and post-treatment: Take out the treated sponge, cool it to room temperature, clean the surface, remove the unreacted residual substances, and finally dry it again.

[0012] Preferably, in step 1, the formula includes 100 grams of melamine sponge, 5-10 grams of silane coupling agent (KH-570), 10-20 grams of silicone oil (PDMS), 100-200 milliliters of solvent, and 0.1-0.5 grams of catalyst.

[0013] Preferably, the step 2: pre-treating the melamine sponge raw material comprises cutting the melamine sponge into a desired size and washing it, removing surface impurities, and drying the washed sponge in a drying oven at 60° C. for 2 hours to ensure that it is completely dry.

[0014] Preferably, the step 3: preparing the impregnation solution comprises:

[0015] 1. Solvent selection and preparation:

[0016] Select 100-200 ml of an appropriate solvent (such as ethanol, toluene) to ensure that the silane coupling agent and silicone oil can be completely dissolved;

[0017] 2. Addition of silane coupling agent:

[0018] Accurately weigh the silane coupling agent (5-10 g), slowly add it to the solvent, and stir evenly until it is completely dissolved.

[0019] 1. Addition of silicone oil:

[0020] Weigh silicone oil (10-20 g), add it to the solution, and stir evenly;

[0021] 2. Addition of catalyst:

[0022] Add catalyst (0.1-0.5 g) and continue stirring to ensure that all ingredients are evenly dispersed;

[0023] 3. Ultrasonic treatment:

[0024] The solution was treated using ultrasound for 30 min to ensure homogeneity and dispersion of the solution.

[0025] 1. Mechanical stirring:

[0026] Through mechanical stirring or rotary oscillation, the impregnation liquid is fully penetrated into the pore structure of the sponge. The treatment time is 30-60 minutes;

[0027] 2. Vacuum filtration:

[0028] During the impregnation process, a vacuum filtration device can be used to help the impregnation liquid be more evenly distributed in the sponge.

[0029] Preferably, in the step 4: impregnation treatment, during the impregnation process, ultrasonic-assisted treatment and vacuum filtration can ensure uniform distribution of the impregnation liquid in the sponge, thereby reducing problems of broken bubbles, collapsed bubbles and closed cells in the finished product.

[0030] Preferably, in the step 3: preparing the dipping solution, a suitable solvent (such as ethanol, toluene) is selected, and the silane coupling agent and silicone oil are uniformly dispersed in the solvent according to their solubility.

[0031] Preferably, in step five: treatment after impregnation, the heat treatment time and temperature can be fine-tuned according to the specific material to ensure the best bonding between the silane coupling agent and the sponge. A gradient heating method can be used to gradually adapt the sponge structure to the high temperature and reduce the stress during the heat treatment of the material.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention provides a simple and economical method for preparing a hydrophobically modified melamine sponge, which simplifies the process, reduces the cost and improves the preparation efficiency by optimizing the ingredients and preparation steps. The prepared sponge has excellent hydrophobicity and oil absorption capacity and is suitable for a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 The present invention is a flow chart of a method for preparing a hydrophobically modified melamine sponge;

[0036] Figure 2 The table of ingredients of Example 1 of the present invention is as follows;

[0037] Figure 3 It is the table of ingredients of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 3 , the present invention provides a technical solution:

[0040] A method for preparing a hydrophobically modified melamine sponge comprises the following preparation steps:

[0041] Step 1: Prepare the ingredients of melamine sponge, silane coupling agent (KH-570), silicone oil (PDMS), solvent and catalyst in proportion;

[0042] Step 2: pre-treating the melamine sponge raw material;

[0043] Step 3: Preparation of dipping solution;

[0044] Step 4: Dipping treatment: dip the dried melamine sponge into the dipping solution, making sure the sponge is completely immersed in the solution;

[0045] Step 5: Post-impregnation treatment: Take out the impregnated sponge, gently squeeze it to remove excess solution, and further dry the sponge in a drying oven at 60°C for 4 hours to ensure that the solvent is completely volatilized and promote the bonding of the silane coupling agent and the sponge;

[0046] Step 6: Curing treatment: Place the dried sponge in a heat treatment furnace and heat it at 120°C for 2 hours to further cure the silane coupling agent and the sponge to form a stable hydrophobic layer;

[0047] Step 7: Cooling and post-treatment: Take out the treated sponge, cool it to room temperature, clean the surface, remove the unreacted residual substances, and finally dry it again.

[0048] In the step 1, the formula includes 100 grams of melamine sponge, 5-10 grams of silane coupling agent (KH-570), 10-20 grams of silicone oil (PDMS), 100-200 milliliters of solvent, and 0.1-0.5 grams of catalyst.

[0049] The step 2: pre-treating the melamine sponge raw material includes cutting the melamine sponge into required sizes and cleaning it, removing surface impurities, and drying the cleaned sponge in a drying oven at 60° C. for 2 hours to ensure that it is completely dry.

[0050] The step 3: preparing the impregnation solution comprises:

[0051] 1. Solvent selection and preparation:

[0052] Select 100-200 ml of an appropriate solvent (such as ethanol, toluene) to ensure that the silane coupling agent and silicone oil can be completely dissolved;

[0053] 2. Addition of silane coupling agent:

[0054] Accurately weigh the silane coupling agent (5-10 g), slowly add it to the solvent, and stir evenly until it is completely dissolved.

[0055] 1. Addition of silicone oil:

[0056] Weigh silicone oil (10-20 g), add it to the solution, and stir evenly;

[0057] 2. Addition of catalyst:

[0058] Add catalyst (0.1-0.5 g) and continue stirring to ensure that all ingredients are evenly dispersed;

[0059] 3. Ultrasonic treatment:

[0060] The solution was treated using ultrasound for 30 min to ensure homogeneity and dispersion of the solution.

[0061] 1. Mechanical stirring:

[0062] Through mechanical stirring or rotary oscillation, the impregnation liquid is fully penetrated into the pore structure of the sponge. The treatment time is 30-60 minutes;

[0063] 2. Vacuum filtration:

[0064] During the impregnation process, a vacuum filtration device can be used to help the impregnation liquid be more evenly distributed in the sponge.

[0065] The fourth step is impregnation treatment. During the impregnation process, ultrasonic-assisted treatment and vacuum filtration can ensure uniform distribution of the impregnation liquid in the sponge, thereby reducing problems such as broken bubbles, collapsed bubbles, and closed cells in the finished product.

[0066] The third step is to prepare the dipping solution, select a suitable solvent (such as ethanol, toluene), and ensure that the silane coupling agent and silicone oil are evenly dispersed in the solvent according to their solubility.

[0067] The step five: treatment after impregnation, the heat treatment time and temperature can be fine-tuned according to the specific material to ensure the best bonding between the silane coupling agent and the sponge. A gradient temperature increase method can be used to gradually adapt the sponge structure to the high temperature and reduce the stress during the heat treatment of the material.

[0068] Embodiment 1:

[0069] Ingredients:

[0070] Melamine sponge: 100g

[0071] Silane coupling agent (KH-570): 5 g

[0072] Silicone oil (PDMS): 10 g

[0073] Solvent (ethanol): 100 ml

[0074] Catalyst (organic silicon catalyst): 0.2 g

[0075] Preparation steps:

[0076] After pretreatment, the melamine sponge was immersed in the prepared impregnation solution and subjected to ultrasonic treatment for 45 minutes.

[0077] Use a vacuum filtration unit to process the impregnated sponge to ensure even distribution.

[0078] The sponge was dried in a drying oven at 60°C for 4 hours.

[0079] The dried sponge was heat treated at 120° C. for 2 hours and cooled to obtain a hydrophobically modified melamine sponge.

[0080] Embodiment 2:

[0081] Ingredients:

[0082] Melamine sponge: 100g

[0083] Silane coupling agent (KH-792): 8 g

[0084] Silicone oil (PDMS): 15 g

[0085] Solvent (toluene): 150 ml

[0086] Catalyst (organic silicon catalyst): 0.3 g

[0087] Preparation steps

[0088] After pre-treatment, the melamine sponge was immersed in the prepared impregnation solution and mechanically stirred for 30 minutes.

[0089] Ultrasonic treatment is used to ensure even distribution of the impregnation liquid.

[0090] The sponge was dried in a drying oven at 60°C for 4 hours.

[0091] The dried sponge was heat treated at 120° C. for 2 hours and cooled to obtain a hydrophobically modified melamine sponge.

[0092] Through these optimization steps, the preparation efficiency and quality of hydrophobically modified melamine sponge were further improved, ensuring its reliability and performance in practical applications.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a hydrophobically modified melamine sponge, characterized in that: The method comprises the following preparation steps: Step 1: Prepare the ingredients of melamine sponge, silane coupling agent (KH-570), silicone oil (PDMS), solvent and catalyst in proportion; Step 2: pre-treating the melamine sponge raw material; Step 3: Preparation of dipping solution; Step 4: Dipping treatment: dip the dried melamine sponge into the dipping solution, making sure the sponge is completely immersed in the solution; Step 5: Post-impregnation treatment: Take out the impregnated sponge, gently squeeze it to remove excess solution, and further dry the sponge in a drying oven at 60°C for 4 hours to ensure that the solvent is completely volatilized and promote the bonding of the silane coupling agent and the sponge; Step 6: Curing treatment: Place the dried sponge in a heat treatment furnace and heat it at 120°C for 2 hours to further cure the silane coupling agent and the sponge to form a stable hydrophobic layer; Step 7: Cooling and post-treatment: Take out the treated sponge, cool it to room temperature, clean the surface, remove the unreacted residual substances, and finally dry it again.

2. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: In the step 1, the formula includes 100 grams of melamine sponge, 5-10 grams of silane coupling agent (KH-570), 10-20 grams of silicone oil (PDMS), 100-200 milliliters of solvent, and 0.1-0.5 grams of catalyst.

3. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: The step 2: pre-treating the melamine sponge raw material includes cutting the melamine sponge into required sizes and cleaning it, removing surface impurities, and drying the cleaned sponge in a drying oven at 60° C. for 2 hours to ensure that it is completely dry.

4. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: The step 3: preparing the impregnation solution comprises:

1. Solvent selection and preparation: Select 100-200 ml of an appropriate solvent (such as ethanol, toluene) to ensure that the silane coupling agent and silicone oil can be completely dissolved; 2. Addition of silane coupling agent: Accurately weigh the silane coupling agent (5-10 g), slowly add it to the solvent, and stir evenly until it is completely dissolved.

5. The method for preparing a hydrophobically modified melamine sponge according to claim 4, characterized in that: The step 3: preparing the impregnation solution further comprises:

1. Addition of silicone oil: Weigh silicone oil (10-20 g), add it to the solution, and stir evenly; 2. Addition of catalyst: Add catalyst (0.1-0.5 g) and continue stirring to ensure that all ingredients are evenly dispersed; 3. Ultrasonic treatment: The solution was treated using ultrasound for 30 min to ensure homogeneity and dispersion of the solution.

6. The method for preparing a hydrophobically modified melamine sponge according to claim 5, characterized in that: The step 3: preparing the impregnation solution comprises:

1. Mechanical stirring: Through mechanical stirring or rotary oscillation, the impregnation liquid is fully penetrated into the pore structure of the sponge. The treatment time is 30-60 minutes; 2. Vacuum filtration: During the impregnation process, a vacuum filtration device can be used to help the impregnation liquid be more evenly distributed in the sponge.

7. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: The fourth step is impregnation treatment. During the impregnation process, ultrasonic-assisted treatment and vacuum filtration can ensure uniform distribution of the impregnation liquid in the sponge, thereby reducing problems such as flattening, broken bubbles, collapsed bubbles, and closed cells.

8. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: The third step is to prepare the dipping solution, select a suitable solvent (such as ethanol, toluene), and ensure that the silane coupling agent and silicone oil are evenly dispersed in the solvent according to their solubility.

9. The method for preparing a hydrophobically modified melamine sponge according to claim 1, characterized in that: The step five: treatment after impregnation, the heat treatment time and temperature can be fine-tuned according to the specific material to ensure the best bonding between the silane coupling agent and the sponge. A gradient temperature increase method can be used to gradually adapt the sponge structure to the high temperature and reduce the stress during the heat treatment of the material.

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