Water-based release agent for polyurethane foaming of car seats

Abstract

The application relates to the technical field of release agents, and discloses a water-based release agent for polyurethane foaming of automobile seats, which is prepared by stirring polydimethylsilane, octamethyltetrasiloxane, deionized water, polyoxyethylene polyethylene glycol carboxylate and propylene glycol at a speed of 600-800 r / min for 3-6 min under room temperature conditions, continuously adding modified carbon nanotubes and double-end epoxy silicone oil, and stirring at a speed of 1000-1500 r / min for 4-7 min. The water-based release agent for polyurethane foaming of automobile seats has good release effect.

Description

Technical Field

[0001] This invention relates to the field of mold release agent technology, specifically to a water-based mold release agent for polyurethane foaming of automotive seats. Background Technology

[0002] Polyurethane foam materials are widely used in automotive seat manufacturing, but they tend to stick to the mold during demolding, requiring the use of release agents. Traditional solvent-based release agents contain volatile organic compounds, polluting the environment and harming the health of operators. While existing water-based release agents are more environmentally friendly, they still suffer from low demolding efficiency, poor film formation, and residues that affect subsequent coatings. As the literature "Research Progress of Water-Based Release Agents" states, water-based release agents are safe to use, reduce environmental pollution, and are easy to clean; however, they still exhibit instability and poor performance after repeated demolding. Therefore, avoiding these issues is key to solving the problem. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a water-based release agent for polyurethane foam in automotive seats, which has a better release effect.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: an aqueous release agent for polyurethane foaming of automotive seats, comprising the following weight components: 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 polyethylene oxide 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.

[0007] Furthermore, the method for preparing the modified carbon nanotubes is as follows:

[0008] S1. After uniformly dispersing N,N-dimethylformamide solvent, carboxylated carbon nanotubes and thionyl chloride by ultrasonication, the mixture is heated to reflux and reacted at 120-140℃. After the reaction is completed, the mixture is rotary evaporated, washed with tetrahydrofuran, and dried to obtain acyl chloride carbon nanotubes.

[0009] S2. Add tris(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 the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0010] Furthermore, the ratio of N,N-dimethylformamide, carboxylated carbon nanotubes, and thionyl chloride in S1 is 60-80 mL: 2-3 g: 21-25 g.

[0011] Furthermore, the reaction time in S1 is 16-22 hours.

[0012] Furthermore, the 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.

[0013] Furthermore, the reaction temperature in S2 is 90-95℃.

[0014] Furthermore, the preparation method of the double-ended epoxy silicone oil is as follows:

[0015] Add 5-6g of octamethylcyclotetrasiloxane and 7-8.2g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen, and then add 0.021-0.023g of tetramethylammonium hydroxide. React at 70-75℃ for 3-5 hours. After the reaction is complete, cool and discharge the material to obtain double-ended epoxy silicone oil.

[0016] Further, the preparation method of the water-based release agent for polyurethane foaming of automotive seats is as follows: polydimethylsilane, octamethyltetrasiloxane, deionized water polyoxyethylene carboxylate, and propylene glycol are stirred at room temperature using a magnetic stirrer at a rate of 600-800 r / min for 3-6 min, and then modified carbon nanotubes and double-ended epoxy silicone oil are added and stirred at a rate of 1000-1500 r / min for 4-7 min to obtain the water-based release agent for polyurethane foaming of automotive seats.

[0017] (iii) Beneficial technical effects

[0018] By using a combination of polydimethylsilane, octamethyltetrasiloxane, modified carbon nanotubes, polyethylene oxide 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 polyurethane foam material and mold, thereby achieving a good release effect.

[0019] Modified carbon nanotubes, by introducing tris(4-aminophenyl)amine, enhance the dispersibility and stability of carbon nanotubes, further improving the mechanical properties and thermal stability of the release agent.

[0020] Double-ended epoxy silicone oil enhances the lubricity and surface smoothness of the release agent through synergistic effects with polydimethylsilane and octamethyltetrasiloxane, further improving the release effect. The epoxy groups in the double-ended epoxy silicone oil can undergo ring-opening reactions with the amino groups in the modified carbon nanotubes to generate hydroxyl groups, forming chemical bonds. This further enhances the adhesion and uniformity of the release agent on the mold surface, thereby improving the release effect and ensuring more uniform dispersion of the modified carbon nanotubes in the release agent. Attached Figure Description

[0021] Figure 1 It is the reaction formula of the modified carbon nanotubes in Example 1. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0024] The preparation of carboxylated carbon nanotubes was described in the reference "Carboxyl Functionalization of Carbon Nanotubes and Its Influence on Cement Stone". A small amount of carbon nanotubes was placed in a beaker, moistened with 10 mL of ethanol, and then thoroughly mixed with 10 mL of dilute sulfuric acid solution. The solution was heated at 80℃ and slowly stirred for 6 hours. After the mixture was allowed to cool to room temperature, 1 mL of nitric acid was added dropwise under slow stirring. After stirring for 24 hours, the mixture was washed with water until the pH reached 7.

[0025] Example 1

[0026] S1. 60 mL of N,N-dimethylformamide solvent, 2 g of carboxylated carbon nanotubes and 21 g of thionyl chloride were ultrasonically dispersed evenly, heated to reflux, and reacted at 120 °C for 16 h. After the reaction was completed, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain acyl chloride carbon nanotubes.

[0027] S2. Add 1.2 mmol of tris(4-aminophenyl)amine to 75 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 0.4 mmol of acyl chloride carbon nanotubes and 0.01 g of triethylamine catalyst. React at 90 °C for 6 h. After the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0028] S3. Add 5g of octamethylcyclotetrasiloxane and 7g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen for protection, and then add 0.021g of tetramethylammonium hydroxide. React at 70°C for 3 hours. After the reaction is completed, cool and discharge the material to obtain double-ended epoxy silicone oil.

[0029] S4. Mix 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 oxide carboxylate, and 4 parts by weight of propylene glycol at room temperature using a magnetic stirrer at a speed of 600 r / min for 3 min. Then add 1 part by weight of modified carbon nanotubes and 1 part by weight of double-ended epoxy silicone oil and stir at a speed of 1000 r / min for 4 min to obtain an aqueous release agent for polyurethane foaming of automotive seats.

[0030] Example 2

[0031] S1. 80 mL of N,N-dimethylformamide solvent, 3 g of carboxylated carbon nanotubes and 25 g of thionyl chloride were ultrasonically dispersed and then heated under reflux at 140 °C for 22 h. After the reaction was completed, the mixture was rotary evaporated, washed with tetrahydrofuran and dried to obtain acyl chloride carbon nanotubes.

[0032] S2. Add 1.5 mmol of tris(4-aminophenyl)amine to 85 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 0.42 mmol of acyl chloride carbon nanotubes and 0.02 g of triethylamine catalyst. React at 95 °C for 8 h. After the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0033] S3. Add 6g of octamethylcyclotetrasiloxane and 8.2g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen for protection, and then add 0.023g of tetramethylammonium hydroxide. React at 75°C for 5 hours. After the reaction is completed, cool and discharge the product to obtain double-ended epoxy silicone oil.

[0034] 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 oxide carboxylate, and 7 parts by weight of propylene glycol are stirred at 800 r / min for 6 min at room temperature using a magnetic stirrer. Then, 1.5 parts by weight of modified carbon nanotubes and 2 parts by weight of double-ended epoxy silicone oil are added and stirred at 1500 r / min for 7 min to obtain an aqueous release agent for polyurethane foaming of automotive seats.

[0035] Example 3

[0036] S1. 70 mL of N,N-dimethylformamide solvent, 2.5 g of carboxylated carbon nanotubes and 22 g of thionyl chloride were ultrasonically dispersed evenly, heated to reflux, and reacted at 130 °C for 20 h. After the reaction was completed, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain acyl chloride carbon nanotubes.

[0037] S2. Add 1.4 mmol of tris(4-aminophenyl)amine to 80 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 0.41 mmol of acyl chloride carbon nanotubes and 0.015 g of triethylamine catalyst. React at 92 °C for 7 h. After the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0038] S3. Add 5.5g of octamethylcyclotetrasiloxane and 7.6g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen for protection, and then add 0.022g of tetramethylammonium hydroxide. React at 73°C for 4 hours. After the reaction is completed, cool and discharge the material to obtain double-ended epoxy silicone oil.

[0039] 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 oxide carboxylate, and 6 parts by weight of propylene glycol are stirred at 700 r / min for 5 min at room temperature using a magnetic stirrer. Then, 1.2 parts by weight of modified carbon nanotubes and 1.5 parts by weight of double-ended epoxy silicone oil are added and stirred at 1200 r / min for 5 min to obtain an aqueous release agent for polyurethane foaming of automotive seats.

[0040] Example 4

[0041] S1. 60 mL of N,N-dimethylformamide solvent, 2 g of carboxylated carbon nanotubes and 21 g of thionyl chloride were ultrasonically dispersed evenly, heated to reflux, and reacted at 120 °C for 16 h. After the reaction was completed, the mixture was rotary evaporated, washed with tetrahydrofuran, and dried to obtain acyl chloride carbon nanotubes.

[0042] S2. Add 1.2 mmol of tris(4-aminophenyl)amine to 75 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 0.4 mmol of acyl chloride carbon nanotubes and 0.01 g of triethylamine catalyst. React at 90 °C for 6 h. After the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0043] S3. Add 6g of octamethylcyclotetrasiloxane and 8.2g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen for protection, and then add 0.023g of tetramethylammonium hydroxide. React at 75°C for 5 hours. After the reaction is completed, cool and discharge the product to obtain double-ended epoxy silicone oil.

[0044] 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 oxide carboxylate, and 6 parts by weight of propylene glycol are stirred at 700 r / min for 5 min at room temperature using a magnetic stirrer. Then, 1.2 parts by weight of modified carbon nanotubes and 1.5 parts by weight of double-ended epoxy silicone oil are added and stirred at 1200 r / min for 5 min to obtain an aqueous release agent for polyurethane foaming of automotive seats.

[0045] Example 5

[0046] S1. 80 mL of N,N-dimethylformamide solvent, 3 g of carboxylated carbon nanotubes and 25 g of thionyl chloride were ultrasonically dispersed and then heated under reflux at 140 °C for 22 h. After the reaction was completed, the mixture was rotary evaporated, washed with tetrahydrofuran and dried to obtain acyl chloride carbon nanotubes.

[0047] S2. Add 1.5 mmol of tris(4-aminophenyl)amine to 85 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 0.42 mmol of acyl chloride carbon nanotubes and 0.02 g of triethylamine catalyst. React at 95 °C for 8 h. After the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

[0048] S3. Add 5.5g of octamethylcyclotetrasiloxane and 7.6g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen for protection, and then add 0.022g of tetramethylammonium hydroxide. React at 73°C for 4 hours. After the reaction is completed, cool and discharge the material to obtain double-ended epoxy silicone oil.

[0049] S4. Mix 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 oxide carboxylate, and 4 parts by weight of propylene glycol at room temperature using a magnetic stirrer at a speed of 600 r / min for 3 min. Then add 1 part by weight of modified carbon nanotubes and 1 part by weight of double-ended epoxy silicone oil and stir at a speed of 1000 r / min for 4 min to obtain an aqueous release agent for polyurethane foaming of automotive seats.

[0050] Comparative Example 1

[0051] The difference between this comparative example and Example 5 is that tris(4-aminophenyl)amine was used instead of modified carbon nanotubes.

[0052] Comparative Example 2

[0053] The difference between this comparative example and Example 5 is that 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane was used instead of the double-ended epoxy silicone oil.

[0054] Performance testing

[0055] Table 1: Demolding performance test.

[0056]

[0057] As shown in Table 1, Examples 1-5 of the present invention have better demolding force and demolding times compared with Comparative Examples 1-2.

[0058] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0060] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments.

Claims

1. A water-based release agent for polyurethane foam used in automotive seats, characterized in that, It includes 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 polyethylene oxide 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. The method for preparing the modified carbon nanotubes is as follows: S1. After uniformly dispersing N,N-dimethylformamide solvent, carboxylated carbon nanotubes and thionyl chloride by ultrasonication, the mixture is heated to reflux and reacted at 120-140℃. After the reaction is completed, the mixture is rotary evaporated, washed with tetrahydrofuran, and dried to obtain acyl chloride carbon nanotubes. S2. Add tris(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 the reaction is completed, distill under reduced pressure, filter, and wash to obtain modified carbon nanotubes.

2. The water-based release agent for polyurethane foam in automotive seats according to claim 1, characterized in that, The ratio of N,N-dimethylformamide, carboxylated carbon nanotubes, and thionyl chloride in S1 is 60-80 mL: 2-3 g: 21-25 g.

3. The water-based release agent for polyurethane foam in automotive seats according to claim 1, characterized in that, The reaction time in S1 is 16-22 hours.

4. The water-based release agent for polyurethane foam in automotive seats according to claim 1, characterized in that, The ratio of N,N-dimethylformamide, tris(4-aminophenyl)amine, acylchlorocarbon nanotubes, and triethylamine catalyst in S2 is 75-85 mL. 1.2-1.5mmol:0.4-0.42mmol:0.01-0.02g.

5. The water-based release agent for polyurethane foam in automotive seats according to claim 1, characterized in that, The reaction temperature in S2 is 90-95℃.

6. The water-based release agent for polyurethane foam in automotive seats according to claim 1, characterized in that, The preparation method of the double-ended epoxy silicone oil is as follows: Add 5-6g of octamethylcyclotetrasiloxane and 7-8.2g of 1,3-diglycidyl etheroxypropyl-1,1,3,3-tetramethyldisiloxane to the reactor, purge with nitrogen, and then add 0.021-0.023g of tetramethylammonium hydroxide. React at 70-75℃ for 3-5 hours. After the reaction is complete, cool and discharge the material to obtain double-ended epoxy silicone oil.

7. A method for preparing an aqueous release agent for polyurethane foaming of automotive seats as described in any one of claims 1-6, characterized in that, The method for preparing the water-based release agent for polyurethane foaming of automotive seats is as follows: Polydimethylsilane, octamethyltetrasiloxane, deionized water polyethylene oxide carboxylate, and propylene glycol are stirred at room temperature using a magnetic stirrer at a rate of 600-800 r / min for 3-6 min. Modified carbon nanotubes and double-ended epoxy silicone oil are then added and stirred at a rate of 1000-1500 r / min for 4-7 min to obtain the water-based release agent for polyurethane foaming of automotive seats.

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