Water-based release agent for polyurethane foaming of automobile seat

Abstract

The invention relates to the technical field of release agents, and discloses a water-based release agent for automobile seat polyurethane foaming, which is prepared by the following steps: stirring polydimethylsilane, octamethyltetrasiloxane, deionized water polyoxyethylene carboxylate and propylene glycol at room temperature by using a magnetic stirrer at the rate of 600-800r / min for 3-6 minutes; and continuously adding the modified carbon nanotubes and the double-end epoxy silicone oil, and stirring for 4-7 minutes at the speed of 1000-1500 r / min, so as to obtain the water-based release agent for polyurethane foaming of the automobile seat. The water-based release agent for polyurethane foaming of the automobile seat has a relatively good release effect.

Description

Technical Field

[0001] The invention relates to the technical field of release agents, in particular to a water-based release agent for polyurethane foaming of automobile seats. Background Art

[0002] Polyurethane foam is widely used in the manufacture of automotive seats, but it is prone to adhesion to the mold during the demolding process, requiring the use of a release agent to assist in demolding. Traditional solvent-based release agents contain volatile organic compounds, which pollute the environment and endanger the health of operators. Although existing water-based release agents have improved their environmental friendliness, they still have problems such as low demolding efficiency, poor film-forming properties, and residues that affect subsequent coating. As shown in the document "Research Progress of Water-Based Release Agents", water-based release agents are safe to use, can reduce environmental pollution, and are easy to clean, but they still have problems such as instability and poor multiple demolding performance. Therefore, how to avoid this phenomenon is the key to solving the problem. Summary of the Invention

[0003] (1) Technical problems solved In view of the shortcomings of the prior art, the present invention provides a water-based release agent for polyurethane foaming of automobile seats, which has a good demoulding effect.

[0004] (2) Technical solution To achieve the above objectives, the present invention provides the following technical solution: a water-based release agent for polyurethane foaming of automobile seats, comprising the following components by weight: 8-15 parts by weight of polydimethylsilane, 10-12 parts by weight of octamethyltetrasiloxane, 1-1.5 parts by weight of modified carbon nanotubes, 3-4 parts by weight of polyoxyethylene carboxylate, 4-7 parts by weight of propylene glycol, 1-2 parts by weight of double-ended epoxy silicone oil, and 5-10 parts by weight of deionized water.

[0005] Furthermore, the preparation method of the modified carbon nanotubes is: S1. After uniformly dispersing N,N-dimethylformamide solvent, carboxylated carbon nanotubes and thionyl chloride by ultrasonication, heating under reflux, reacting at 120-140°C, and after completion of the reaction, rotary evaporation, washing with tetrahydrofuran, and drying to obtain acyl chloride carbon nanotubes; S2. Add tri(4-aminophenyl)amine to N,N-dimethylformamide solvent, stir to dissolve, and continue to add acyl chloride carbon nanotubes and triethylamine catalyst. React for 6-8 hours. After reaction, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0006] Furthermore, the usage ratio of N,N-dimethylformamide, carboxylated carbon nanotubes, and thionyl chloride in S1 is 60-80 mL: 2-3 g: 21-25 g.

[0007] Furthermore, the reaction time in S1 is 16-22 hours.

[0008] Furthermore, the usage ratio of N,N-dimethylformamide, tris(4-aminophenyl)amine, acyl chloride carbon nanotubes, and triethylamine catalyst in S2 is 75-85 mL:1.2-1.5 mmol:0.4-0.42 mmol:0.01-0.02 g.

[0009] Furthermore, the reaction temperature in S2 is 90-95°C.

[0010] Furthermore, the preparation method of the double-ended epoxy silicone oil is: Add 5-6 g of octamethylcyclotetrasiloxane and 7-8.2 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, introduce nitrogen protection, then continue to add 0.021-0.023 g of tetramethylammonium hydroxide, react at 70-75 ° C for 3-5 hours, and then cool and discharge to obtain double-ended epoxy silicone oil.

[0011] Furthermore, the preparation method of the water-based release agent for polyurethane foaming of automobile seats is as follows: polydimethylsilane, octamethyltetrasiloxane, deionized water polyoxyethylene carboxylate, and propylene glycol are stirred at a rate of 600-800 r / min for 3-6 minutes using a magnetic stirrer at room temperature, and modified carbon nanotubes and double-ended epoxy silicone oil are continuously added and stirred at a rate of 1000-1500 r / min for 4-7 minutes to obtain the water-based release agent for polyurethane foaming of automobile seats.

[0012] (3) Beneficial technical effects By using a combination of polydimethylsilane, octamethyltetrasiloxane, modified carbon nanotubes, polyethylene glycol carboxylate, propylene glycol, double-ended epoxy silicone oil and deionized water, the water-based release agent of the present invention can effectively reduce the adhesion between the polyurethane foam material and the mold, thereby achieving a good demolding effect.

[0013] The modified carbon nanotubes enhance the dispersibility and stability of the carbon nanotubes by introducing tris(4-aminophenyl)amine, and further improve the mechanical properties and thermal stability of the release agent.

[0014] The double-ended epoxy silicone oil, through its synergistic effect with polydimethylsilane and octamethyltetrasiloxane, enhances the release agent's lubricity and surface smoothness, further improving the release effect. The epoxy groups in the double-ended epoxy silicone oil undergo a ring-opening reaction with the amino groups in the modified carbon nanotubes, generating hydroxyl groups and forming chemical bonds. This further enhances the release agent's adhesion and uniformity on the mold surface, thereby improving the release effect and ensuring a more even dispersion of the modified carbon nanotubes in the release agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the reaction formula for modifying carbon nanotubes in Example 1. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Preparation of carboxylated carbon nanotubes: Refer to the reference "Carboxyl Functionalization of Carbon Nanotubes and Its Effect on Cement Paste." Place a small amount of carbon nanotubes in a beaker, moisten with 10 mL of ethanol, and thoroughly mix with 10 mL of dilute sulfuric acid. Heat the solution at 80°C and slowly stir for 6 hours. Allow the mixture to cool to room temperature, then slowly add 1 mL of nitric acid dropwise while stirring. Stir for 24 hours, then rinse with water until the pH reaches 7.

[0019] Example 1 S1. After ultrasonically dispersing 60 mL of N,N-dimethylformamide solvent, 2 g of carboxylated carbon nanotubes, and 21 g of thionyl chloride, the mixture was heated to reflux and reacted at 120°C for 16 h. After the reaction, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain chlorinated carbon nanotubes. S2. To 75 mL of N,N-dimethylformamide solvent was added 1.2 mmol of tris(4-aminophenyl)amine, stirred and dissolved, and then 0.4 mmol of acyl chloride carbon nanotubes and 0.01 g of triethylamine catalyst were added. The reaction was carried out at 90°C for 6 h. After the reaction, the modified carbon nanotubes were distilled under reduced pressure, filtered, and washed. S3. 5 g of octamethylcyclotetrasiloxane and 7 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane were added to the reactor, nitrogen was introduced, and then 0.021 g of tetramethylammonium hydroxide was added and the reaction was continued at 70 ° C for 3 h. After the reaction, the material was cooled and discharged to obtain a double-ended epoxy silicone oil; S4. 8 parts by weight of polydimethylsilane, 10 parts by weight of octamethyltetrasiloxane, 5 parts by weight of deionized water, 3 parts by weight of polyethylene glycol, and 4 parts by weight of propylene glycol are stirred at a rate of 600 r / min at room temperature using a magnetic stirrer, and then 1 part by weight of modified carbon nanotubes and 1 part by weight of double-ended epoxy silicone oil are added and stirred at a rate of 1000 r / min for 4 minutes to obtain a water-based release agent for polyurethane foaming of automobile seats.

[0020] Example 2 S1. 80 mL of N,N-dimethylformamide solvent, 3 g of carboxylated carbon nanotubes and 25 g of thionyl chloride were ultrasonically dispersed, heated to reflux, and reacted at 140 ° C for 22 h. After the reaction, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain chlorinated carbon nanotubes; S2. To 85 mL of N,N-dimethylformamide solvent was added 1.5 mmol of tris(4-aminophenyl)amine, stirred and dissolved, and then 0.42 mmol of acyl chloride carbon nanotubes and 0.02 g of triethylamine catalyst were added. The reaction was carried out at 95°C for 8 h. After the reaction, the modified carbon nanotubes were distilled under reduced pressure, filtered, and washed. S3. 6 g of octamethylcyclotetrasiloxane and 8.2 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane were added to the reactor, nitrogen was introduced, and then 0.023 g of tetramethylammonium hydroxide was added and the reaction was carried out at 75 ° C for 5 h. After the reaction, the material was cooled and discharged to obtain a double-ended epoxy silicone oil; S4. 15 parts by weight of polydimethylsilane, 12 parts by weight of octamethyltetrasiloxane, 10 parts by weight of deionized water, 4 parts by weight of polyethylene glycol, and 7 parts by weight of propylene glycol were stirred at 800 r / min for 6 minutes using a magnetic stirrer at room temperature, and then 1.5 parts by weight of modified carbon nanotubes and 2 parts by weight of double-ended epoxy silicone oil were added and stirred at 1500 r / min for 7 minutes to obtain a water-based release agent for polyurethane foaming of automobile seats.

[0021] Example 3 S1. After ultrasonically dispersing 70 mL of N,N-dimethylformamide solvent, 2.5 g of carboxylated carbon nanotubes and 22 g of thionyl chloride, the mixture was heated to reflux and reacted at 130 ° C for 20 h. After the reaction, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain chlorinated carbon nanotubes; S2. To 80 mL of N,N-dimethylformamide solvent was added 1.4 mmol of tris(4-aminophenyl)amine, stirred and dissolved, and then 0.41 mmol of acyl chloride carbon nanotubes and 0.015 g of triethylamine catalyst were added. The reaction was carried out at 92°C for 7 h. After the reaction, the modified carbon nanotubes were distilled under reduced pressure, filtered, and washed. S3. 5.5 g of octamethylcyclotetrasiloxane and 7.6 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane were added to the reactor, nitrogen was introduced, and then 0.022 g of tetramethylammonium hydroxide was added and the reaction was carried out at 73 ° C for 4 h. After the reaction, the material was cooled and discharged to obtain a double-ended epoxy silicone oil; S4. 10 parts by weight of polydimethylsilane, 11 parts by weight of octamethyltetrasiloxane, 8 parts by weight of deionized water, 3.5 parts by weight of polyethylene glycol, and 6 parts by weight of propylene glycol were stirred at a rate of 700 r / min for 5 minutes using a magnetic stirrer at room temperature, and then 1.2 parts by weight of modified carbon nanotubes and 1.5 parts by weight of double-ended epoxy silicone oil were added and stirred at a rate of 1200 r / min for 5 minutes to obtain a water-based release agent for polyurethane foaming of automobile seats.

[0022] Example 4 S1. After ultrasonically dispersing 60 mL of N,N-dimethylformamide solvent, 2 g of carboxylated carbon nanotubes, and 21 g of thionyl chloride, the mixture was heated to reflux and reacted at 120°C for 16 h. After the reaction, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain chlorinated carbon nanotubes. S2. To 75 mL of N,N-dimethylformamide solvent was added 1.2 mmol of tris(4-aminophenyl)amine, stirred and dissolved, and then 0.4 mmol of acyl chloride carbon nanotubes and 0.01 g of triethylamine catalyst were added. The reaction was carried out at 90°C for 6 h. After the reaction, the modified carbon nanotubes were distilled under reduced pressure, filtered, and washed. S3. 6 g of octamethylcyclotetrasiloxane and 8.2 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane were added to the reactor, nitrogen was introduced, and then 0.023 g of tetramethylammonium hydroxide was added and the reaction was carried out at 75 ° C for 5 h. After the reaction, the material was cooled and discharged to obtain a double-ended epoxy silicone oil; S4. 10 parts by weight of polydimethylsilane, 11 parts by weight of octamethyltetrasiloxane, 8 parts by weight of deionized water, 3.5 parts by weight of polyethylene glycol, and 6 parts by weight of propylene glycol were stirred at a rate of 700 r / min for 5 minutes using a magnetic stirrer at room temperature, and then 1.2 parts by weight of modified carbon nanotubes and 1.5 parts by weight of double-ended epoxy silicone oil were added and stirred at a rate of 1200 r / min for 5 minutes to obtain a water-based release agent for polyurethane foaming of automobile seats.

[0023] Example 5 S1. 80 mL of N,N-dimethylformamide solvent, 3 g of carboxylated carbon nanotubes and 25 g of thionyl chloride were ultrasonically dispersed, heated to reflux, and reacted at 140 ° C for 22 h. After the reaction, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain chlorinated carbon nanotubes; S2. To 85 mL of N,N-dimethylformamide solvent was added 1.5 mmol of tris(4-aminophenyl)amine, stirred and dissolved, and then 0.42 mmol of acyl chloride carbon nanotubes and 0.02 g of triethylamine catalyst were added. The reaction was carried out at 95°C for 8 h. After the reaction, the modified carbon nanotubes were distilled under reduced pressure, filtered, and washed. S3. 5.5 g of octamethylcyclotetrasiloxane and 7.6 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane were added to the reactor, nitrogen was introduced, and then 0.022 g of tetramethylammonium hydroxide was added and the reaction was carried out at 73 ° C for 4 h. After the reaction, the material was cooled and discharged to obtain a double-ended epoxy silicone oil; S4. 8 parts by weight of polydimethylsilane, 10 parts by weight of octamethyltetrasiloxane, 5 parts by weight of deionized water, 3 parts by weight of polyethylene glycol, and 4 parts by weight of propylene glycol are stirred at a rate of 600 r / min at room temperature using a magnetic stirrer, and then 1 part by weight of modified carbon nanotubes and 1 part by weight of double-ended epoxy silicone oil are added and stirred at a rate of 1000 r / min for 4 minutes to obtain a water-based release agent for polyurethane foaming of automobile seats.

[0024] Comparative Example 1 Compared with Example 5, this comparative example differs in that tris(4-aminophenyl)amine is used instead of the modified carbon nanotubes.

[0025] Comparative Example 2 Compared with Example 5, this comparative example differs in that 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane is used instead of the double-ended epoxy silicone oil.

[0026] Performance Testing Table 1: Mold release test.

[0027]

[0028] As can be seen from Table 1, Examples 1-5 of the present invention have better demolding force and demolding times than Comparative Examples 1-2.

[0029] It should be noted that, in this document, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0031] Those skilled in the art should understand that the above descriptions are only some specific embodiments of the present invention, rather than all embodiments.

Claims

1. A water-based release agent for polyurethane foaming of automobile seats, characterized in that: The invention comprises the following components by weight: 8-15 parts by weight of polydimethylsilane, 10-12 parts by weight of octamethyltetrasiloxane, 1-1.5 parts by weight of modified carbon nanotubes, 3-4 parts by weight of polyoxyethylene carboxylate, 4-7 parts by weight of propylene glycol, 1-2 parts by weight of double-ended epoxy silicone oil, and 5-10 parts by weight of deionized water.

2. The aqueous release agent for polyurethane foaming of automobile seats according to claim 1, characterized in that The preparation method of the modified carbon nanotubes is: S1. After uniformly dispersing N,N-dimethylformamide solvent, carboxylated carbon nanotubes and thionyl chloride by ultrasonication, heating under reflux, reacting at 120-140°C, and after completion of the reaction, rotary evaporation, washing with tetrahydrofuran, and drying to obtain acyl chloride carbon nanotubes; S2. Add tri(4-aminophenyl)amine to N,N-dimethylformamide solvent, stir to dissolve, and continue to add acyl chloride carbon nanotubes and triethylamine catalyst. React for 6-8 hours. After reaction, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

3. The aqueous release agent for polyurethane foaming of automobile seats according to claim 2, characterized in that The usage ratio of N,N-dimethylformamide, carboxylated carbon nanotubes, and thionyl chloride in S1 is 60-80 mL: 2-3 g: 21-25 g.

4. The aqueous release agent for polyurethane foaming of automobile seats according to claim 2, characterized in that The reaction time in S1 is 16-22 hours.

5. The aqueous release agent for polyurethane foaming of automobile seats according to claim 2, characterized in that The amount ratio of N,N-dimethylformamide, tris(4-aminophenyl)amine, chlorinated carbon nanotubes, and triethylamine catalyst in S2 is 75-85 mL: 1.2-1.5mmol:0.4-0.42mmol:0.01-0.02g.

6. The aqueous release agent for polyurethane foaming of automobile seats according to claim 2, characterized in that The reaction temperature in S2 is 90-95°C.

7. The aqueous release agent for polyurethane foaming of automobile seats according to claim 1, characterized in that The preparation method of the double-ended epoxy silicone oil is: Add 5-6 g of octamethylcyclotetrasiloxane and 7-8.2 g of 1,3-diglycidyloxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, introduce nitrogen protection, then continue to add 0.021-0.023 g of tetramethylammonium hydroxide, react at 70-75 ° C for 3-5 hours, and then cool and discharge to obtain double-ended epoxy silicone oil.

8. A method for preparing a water-based release agent for polyurethane foaming of automobile seats according to any one of claims 1 to 7, characterized in that: The preparation method of the water-based mold release agent for polyurethane foaming of automobile seats comprises the following steps: stirring polydimethylsilane, octamethyltetrasiloxane, deionized water polyoxyethylene carboxylate, and propylene glycol at room temperature using a magnetic stirrer at a rate of 600-800 r / min for 3-6 minutes, continuously adding modified carbon nanotubes and double-ended epoxy silicone oil and stirring at a rate of 1000-1500 r / min for 4-7 minutes, thereby obtaining the water-based mold release agent for polyurethane foaming of automobile seats.

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