A rubber formaldehyde removal additive and its preparation method

Abstract

This invention discloses a rubber formaldehyde removal additive and its preparation method. The additive comprises the following components by weight percentage: 10-50% amino acids; 10-30% organic solid amines; 10-30% quaternary ammonium salts; 20-70% porous adsorbent material; and 1-5% surfactant. This invention loads a chemical absorbent onto a porous adsorbent material, utilizing the physical adsorption of the porous material to enrich trace aldehyde molecules in the rubber. Simultaneously, the amino groups in the amino acids and organic solid amines undergo irreversible nucleophilic addition reactions with the aldehyde groups, converting the enriched aldehyde molecules into stable Schiff base structures. This achieves a synergistic effect of chemical and physical adsorption, reducing the aldehyde release from the finished rubber product at its source. The additive prepared by this invention has good compatibility with rubber, does not affect the mechanical and processing properties of rubber, and has advantages such as good formaldehyde removal effect, strong targeting, good stability, and no secondary pollution. The preparation process is simple and suitable for industrial production.

Description

Technical Field

[0001] This invention relates to the field of automotive rubber materials, specifically to a rubber formaldehyde removal additive and its preparation method. Background Technology

[0002] With the rapid development of the automotive industry and consumers' increasing focus on in-vehicle air quality, the problem of volatile organic compound (VOC) pollution in vehicles has seriously affected people's riding experience and health. A large number of rubber materials are used in automotive interior systems, such as sealing strips, shock absorbers, pipes, and bushings. Due to residual organic aldehydes from the manufacturing process, these rubber components release organic aldehydes during use, causing air pollution from aldehyde VOCs in the enclosed space of the vehicle. Furthermore, the high-temperature environment inside the vehicle (such as exposure to summer sun) accelerates the volatilization of these substances, further exacerbating in-vehicle air pollution. Therefore, controlling the release of aldehydes from automotive interior rubber materials is of significant practical importance.

[0003] Currently, aldehyde control in automotive interior rubber materials mainly relies on several technical approaches: raw material screening, physical adsorption, adding odor masking agents, post-processing, and chemical adsorption. Each method has its advantages and disadvantages. For example, patent CN115368682A discloses a formula for a low-odor sealing strip, which uses low-odor and low-aldehyde raw materials to produce a low-odor sealing strip product that meets level 5 or higher in both dry and wet processes. This method can reduce aldehyde content to some extent, but it is difficult to completely eliminate aldehydes already present in the material.

[0004] Physical adsorption works by using porous materials to adsorb and fix odor molecules. For example, patent CN121226859A discloses a low-odor, low-VOC tire sidewall rubber composition, using carbon black in combination with a small amount of silica as an adsorbent for VOC odor molecules. Patent CN213007960U discloses an automotive sealing strip with an external odor-removing adsorption layer inside the filling groove, achieving the adsorption and deodorization effect of the strip on odors in the car's interior environment. However, physical adsorbents have limited adsorption capacity and are prone to desorption under high temperature or long-term use conditions, causing secondary VOC pollution. In addition, traditional adsorbents have poor compatibility with rubber, which can easily lead to a decline in the mechanical properties of rubber.

[0005] Odor masking agents are added to cover up the odor of the rubber itself by releasing fragrant substances. For example, patent CN112250952A discloses an odorless car sealing strip that makes the sealing strip fragrant and non-irritating by adding bamboo fragrance. However, this method does not actually remove aldehydes; it only masks the odor and cannot fundamentally improve the air quality inside the car.

[0006] Post-processing techniques, such as high-temperature baking, steam treatment, or vacuum degassing of molded rubber products, can accelerate the release of aldehydes. For example, patent CN114230693A discloses a method for continuously removing VOCs from ethylene propylene rubber and reducing its odor level. However, such methods are complex, energy-intensive, and their deodorization effect often gradually diminishes over time, making long-term control difficult.

[0007] Chemical adsorption is characterized by its high targeting and reaction efficiency. Patent CN119081297A discloses a novel rubber compound and its preparation method, which chemically modifies montmorillonite by introducing an organic quaternary ammonium salt. This utilizes the chemical interaction between the quaternary ammonium salt and volatile small molecules to reduce VOC emissions. However, this technology has limited chemical selectivity for aldehyde removal, thus limiting its application.

[0008] A rubber formaldehyde removal additive can be prepared by combining chemical and physical adsorption methods. The chemical absorbent is loaded onto a porous adsorption material, utilizing the dispersion characteristics of the porous material to ensure uniform dispersion of the components. On one hand, trace aldehyde molecules in the rubber are enriched through physical adsorption; on the other hand, the amino groups in the chemical absorbent undergo irreversible nucleophilic addition reactions with the aldehyde groups, converting the enriched aldehyde molecules into stable Schiff base structures, thus achieving complete immobilization of trace aldehydes. This method combines the synergistic effects of chemical and physical adsorption, exhibiting strong targeting, good stability, and no secondary pollution, providing a more durable and environmentally friendly solution for improving the automotive driving environment.

[0009] The rubber formaldehyde removal additive prepared by this invention possesses the above-mentioned characteristics. This rubber formaldehyde removal additive is green and non-toxic, exhibits significant formaldehyde removal effect, and maintains stable chemical reactivity even under high-temperature conditions during rubber processing, demonstrating good applicability and market potential. Summary of the Invention

[0010] In view of the problems existing in the prior art, the purpose of this invention is to provide a rubber formaldehyde removal additive with significant formaldehyde removal effect, good rubber compatibility, long duration, high safety and environmental friendliness, and its preparation method.

[0011] To achieve the above objectives, the technical solution of the present invention is as follows: This invention proposes a rubber formaldehyde removal additive, which, by weight percentage, comprises the following components: Amino acids 10-50%; Organic solid amines 10-30%; Quaternary ammonium salts 10-30%; Porous adsorbent materials account for 20-70%; Surfactant 1-5%.

[0012] Further, the amino acid is one or more selected from DL-tyrosine, DL-phenylalanine, 6-aminonicotinic acid, L-leucine, and D-glutamic acid.

[0013] Furthermore, the organic solid amine is one or more of melamine, acrylamide, and dicyandiamine.

[0014] Furthermore, the quaternary ammonium salt is one or more of chitosan quaternary ammonium salt, imidazole-type organosilicon quaternary ammonium salt, tetramethylammonium chloride, and tetraethylammonium chloride.

[0015] Furthermore, the porous adsorbent material is one or more of activated carbon, silica, fumed silica, diatomaceous earth, and montmorillonite.

[0016] Furthermore, the surfactant is one or more of hexadecyltrimethylammonium bromide, fatty alcohol polyoxyethylene ether, and alkyl glycoside.

[0017] The present invention also proposes a method for preparing the aforementioned rubber formaldehyde removal additive, comprising the following steps: 1) According to the formula, add amino acids, organic solid amines, quaternary ammonium salts and surfactants to a water / ethanol mixed solvent, stir in a water bath to completely dissolve all components, and obtain an impregnation solution; 2) According to the formula, add the porous adsorbent material to the impregnation solution prepared in step 1), and impregnate it with ultrasonic stirring at room temperature so that the active components are fully loaded into the pore structure and surface of the porous adsorbent material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at high temperature to obtain the finished rubber formaldehyde removal additive.

[0018] Further, in step 1), the volume ratio of water to ethanol is 1~3:1, the water bath temperature is 30-50℃, and the stirring time is 10-20 min.

[0019] Further, in step 2), the solid-liquid ratio is controlled at 1:1~3, and the mixture is stirred and impregnated at room temperature for 4-12 h; ultrasonic-assisted impregnation is performed with an ultrasonic power of 200-400 W.

[0020] Furthermore, in step 3), the high temperature is 60-80℃ and the drying time is 8-16 h.

[0021] The mechanism of this invention is as follows: The rubber formaldehyde removal additive of this invention achieves efficient removal of aldehydes through a synergistic mechanism of "physical enrichment-chemical fixation". The porous adsorbent material, utilizing its high specific surface area and abundant pore structure, preferentially adsorbs free small aldehyde molecules from rubber, enriching them within the additive. Simultaneously, the amino groups in the amino acids, organic solid amines, and quaternary ammonium salts loaded on the pores and surface undergo irreversible nucleophilic addition reactions with the aldehyde groups, generating stable Schiff base structures, thereby permanently fixing the aldehyde molecules and avoiding the secondary pollution problem caused by desorption that easily occurs in traditional physical adsorbents under high temperature or long-term use conditions.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) High-efficiency formaldehyde removal: The formaldehyde removal additive for rubber of the present invention can achieve a formaldehyde removal rate of up to 90% or more, significantly reducing the amount of formaldehyde released from rubber products; 2) Good compatibility: The rubber formaldehyde removal additive has good compatibility with rubber. It is evenly dispersed during the mixing process and does not affect the vulcanization characteristics and mechanical properties of the rubber. The finished rubber does not bubble, has a smooth appearance, and has stable tensile strength. 3) Safe and non-toxic: The substances selected in this invention are all biocompatible compounds, non-toxic and harmless, and will not release harmful substances during use, which meets the environmental protection requirements of automotive interior materials. 4) Easy to scale up production: The preparation process of this invention is simple, the equipment requirements are low, it is easy to scale up industrial production, and it has good market prospects. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited to the scope described.

[0024] Comparative Example: Rubber formaldehyde removal additive: 0g.

[0025] Comparative Example 1: A rubber formaldehyde removal additive, comprising the following components by weight: 100% activated carbon Comparative Example 2: A rubber formaldehyde removal additive, comprising the following components by weight: DL-tyrosine 40%, melamine 25%, and chitosan quaternary ammonium salt 25%.

[0026] Example 1

[0027] A rubber formaldehyde removal additive comprises the following components in parts by weight: DL-tyrosine 30%, melamine 15%, chitosan quaternary ammonium salt 20%, activated carbon 30%, and cetyltrimethylammonium bromide 5%.

[0028] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.3g DL-tyrosine, 0.15g melamine, 0.2g chitosan quaternary ammonium salt, and 0.05g hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent. The volume ratio of water to ethanol is 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.3g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0029] Example 2

[0030] A rubber formaldehyde removal additive comprises the following components by weight: DL-phenylalanine 30%, acrylamide 20%, imidazole-type organosilicon quaternary ammonium salt 15%, activated carbon 30%, and hexadecyltrimethylammonium bromide 5%, with the sum of the weight percentages of each component being 100%.

[0031] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.3g DL-phenylalanine, 0.2g acrylamide, 0.15g imidazole type organosilicon quaternary ammonium salt and 0.05g hexadecyltrimethylammonium bromide to 300mL water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain impregnation solution; 2) According to the formula, add 0.3g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0032] Example 3

[0033] A rubber formaldehyde removal additive comprises the following components by weight: 40% 6-aminonicotinic acid, 15% dioxane, 15% tetramethylammonium chloride, 25% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0034] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.4g of 6-aminonicotinic acid, 0.15g of dioxanediamine, 0.15g of tetramethylammonium chloride and 0.05g of hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.25g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0035] Example 4

[0036] A rubber formaldehyde removal additive comprises the following components by weight: 25% L-leucine, 20% melamine, 25% tetraethylammonium chloride, 25% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0037] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.25g L-leucine, 0.2g melamine, 0.25g tetraethylammonium chloride, and 0.05g hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent. The volume ratio of water to ethanol is 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.25g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0038] Example 5

[0039] A rubber formaldehyde removal additive comprises the following components by weight: 30% D-glutamic acid, 20% acrylamide, 20% chitosan quaternary ammonium salt, 25% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0040] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.3g D-glutamic acid, 0.2g acrylamide, 0.2g chitosan quaternary ammonium salt and 0.05g hexadecyltrimethylammonium bromide to 300mL water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.25g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0041] Example 6

[0042] A rubber formaldehyde removal additive comprises the following components by weight: 20% DL-tyrosine, 20% DL-phenylalanine, 10% melamine, 15% chitosan quaternary ammonium salt, 30% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0043] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.2g DL-tyrosine, 0.2g DL-phenylalanine, 0.1g melamine, 0.15g chitosan quaternary ammonium salt, and 0.05g hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.3g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0044] Example 7

[0045] A rubber formaldehyde removal additive comprises the following components by weight: 15% 6-aminonicotinic acid, 15% L-leucine, 15% acrylamide, 20% imidazole-type organosilicon quaternary ammonium salt, 30% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0046] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.15g of 6-aminonicotinic acid, 0.15g of L-leucine, 0.15g of acrylamide, 0.2g of imidazole-type organosilicon quaternary ammonium salt, and 0.05g of hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.3g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0047] Example 8

[0048] A rubber formaldehyde removal additive comprises the following components by weight: 12% 6-aminonicotinic acid, 12% L-leucine, 12% D-glutamic acid, 12% dioxane, 12% chitosan quaternary ammonium salt, 35% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0049] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.12g of 6-aminonicotinic acid, 0.12g of L-leucine, 0.12g of D-glutamic acid, 0.12g of dioxane, 0.12g of chitosan quaternary ammonium salt, and 0.05g of hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent, with a water to ethanol volume ratio of 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.35g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0050] Example 9

[0051] A rubber formaldehyde removal additive comprises the following components by weight: 10% DL-tyrosine, 10% DL-phenylalanine, 10% 6-aminonicotinic acid, 5% L-leucine, 5% D-glutamic acid, 15% melamine, 15% chitosan quaternary ammonium salt, 25% activated carbon, and 5% hexadecyltrimethylammonium bromide, with the sum of the weight percentages of each component being 100%.

[0052] The preparation method of the rubber formaldehyde removal additive in this embodiment includes the following steps: 1) According to the formula, add 0.1g DL-tyrosine, 0.1g DL-phenylalanine, 0.1g 6-aminonicotinic acid, 0.05g 6-aminonicotinic acid, 0.05g D-glutamic acid, 0.15g melamine, 0.15g chitosan quaternary ammonium salt, and 0.05g hexadecyltrimethylammonium bromide to 300mL of water / ethanol mixed solvent. The volume ratio of water to ethanol is 2:1. Stir in a water bath at 40℃ for 15 min to completely dissolve all components and obtain the impregnation solution. 2) According to the formula, add 0.25g of activated carbon to the impregnation solution prepared in step 1), with the solid-liquid ratio controlled at 1:2. At room temperature, use ultrasonic stirring at 300 W power to impregnate for 4 hours to ensure that the active components are fully loaded into the pore structure and surface of the porous material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at 60°C for 8 hours to obtain the finished rubber formaldehyde removal additive.

[0053] The formaldehyde removal additives obtained in Comparative Examples 1-2, Control Examples, and Examples 1-9 were tested as follows: 1. Establishment of an odor assessment model for finished rubber products and a method for verifying formaldehyde removal efficacy: (1) Sample preparation: Plasticize 50g of rubber in a two-roll mill for 5-6 min at a temperature of 50-60℃.

[0054] (2) Formaldehyde removal additive treatment: Add 1% formaldehyde removal additive to the plasticized rubber and continue mixing for 5-8 minutes. Stack the two mixed rubber pieces and vulcanize them at a vulcanization temperature of 220℃ for 5 minutes. Let the prepared rubber samples stand at room temperature for 24 hours.

[0055] (3) Control setting: The rubber sample without formaldehyde removal additives was used as a blank control.

[0056] Evaluation methods: (1) Take 40g of rubber sample that has been left to stand for 24 hours and place it in a 5 L sampling bag. After washing the bag three times, fill it with 5 L of nitrogen and seal it.

[0057] (2) Place the sampling bag in an 80℃ oven and heat for 2 hours.

[0058] (3) Put 5 mL of absorption liquid (phenol reagent solution) into the bubble absorption tube, and immediately after taking out the bag, use a sampler to collect the gas in the bag at a flow rate of 0.2 L / min. The gas collection volume is 5 L.

[0059] (4) The content of aldehydes in 5 L of gas was determined by phenol reagent spectrophotometry, and the aldehyde removal rate of rubber after adding the rubber aldehyde removal additive was calculated. The average value of the aldehyde removal rate is taken, and the results are shown in Table 1.

[0060] Table 1 shows the aldehyde content and aldehyde removal rate (average values) of Comparative Examples 1-2, Control Examples, and Examples 1-9.

[0061] According to the formulation of Example 9, its excellent formaldehyde removal effect is due to the synergistic effect between five amino acids and two chemically active components.

[0062] The total amino acid content in this formula is as high as 40%, covering various structural types such as aromatic (DL-tyrosine, DL-phenylalanine), heterocyclic (6-aminonicotinic acid), and aliphatic (L-leucine, D-glutamic acid). The benzene ring structure of aromatic amino acids helps to enhance the π-π interaction between the formaldehyde removal additive and rubber, improving the dispersion stability of the additive in rubber. Heterocyclic and aliphatic amino acids enhance the affinity for polar aldehyde molecules and the anchoring ability with the porous carrier surface, respectively. Melamine, as an organic solid amine, has a triazine ring structure that gives it excellent thermal stability, maintaining high-density amino reactivity during high-temperature rubber processing. Chitosan quaternary ammonium salt participates in both chemical adsorption and cationic surfactant functions, significantly improving the dispersibility of each component in the impregnation solution and the binding strength with the activated carbon carrier. The surfactant hexadecyltrimethylammonium bromide promotes the penetration and loading of active components into the carrier pores during the preparation process, ensuring the uniform distribution and efficient synergy of each component in the final product.

Claims

1. A rubber formaldehyde removal additive, characterized in that... Based on weight percentage, it includes the following components: Amino acids 10-50%; Organic solid amines 10-30%; Quaternary ammonium salts 10-30%; Porous adsorbent materials account for 20-70%; Surfactant 1-5%.

2. The rubber formaldehyde removal additive according to claim 1, characterized in that... The amino acid is one or more of DL-tyrosine, DL-phenylalanine, 6-aminonicotinic acid, L-leucine, and D-glutamic acid.

3. The rubber formaldehyde removal additive according to claim 1, characterized in that... The organic solid amine is one or more of melamine, acrylamide, and dicyandiamide.

4. The rubber formaldehyde removal additive according to claim 1, characterized in that... The quaternary ammonium salt is one or more of chitosan quaternary ammonium salt, imidazole-type organosilicon quaternary ammonium salt, tetramethylammonium chloride, and tetraethylammonium chloride.

5. The rubber formaldehyde removal additive according to claim 1, characterized in that... The porous adsorbent material is one or more of activated carbon, silica, fumed silica, diatomaceous earth, and montmorillonite.

6. The rubber formaldehyde removal additive according to claim 1, characterized in that... The surfactant is one or more of hexadecyltrimethylammonium bromide, fatty alcohol polyoxyethylene ether, and alkyl glycoside.

7. A method for preparing a rubber formaldehyde removal additive as described in any one of claims 1-6, characterized in that... Includes the following steps: 1) According to the formula, add amino acids, organic solid amines, quaternary ammonium salts and surfactants to a water / ethanol mixed solvent, stir in a water bath to completely dissolve all components, and obtain an impregnation solution; 2) According to the formula, add the porous adsorbent material to the impregnation solution prepared in step 1), and impregnate it with ultrasonic stirring at room temperature so that the active components are fully loaded into the pore structure and surface of the porous adsorbent material. 3) After step 2) is completed, filter the impregnated mixture, collect the solid product, and dry it at high temperature to obtain the finished rubber formaldehyde removal additive.

8. The method for preparing the rubber formaldehyde removal additive according to claim 7, characterized in that... In step 1), the volume ratio of water to ethanol is 1~3:1, the water bath temperature is 30-50℃, and the stirring time is 10-20 min.

9. The method for preparing the rubber formaldehyde removal additive according to claim 7, characterized in that... In step 2), the solid-liquid ratio is controlled at 1:1~3, and the mixture is stirred and impregnated at room temperature for 4-12 hours; ultrasonic impregnation is performed with an ultrasonic power of 200-400 W.

10. The method for preparing the rubber formaldehyde removal additive according to claim 7, characterized in that... In step 3), the high temperature is 60-80℃ and the drying time is 8-16 hours.

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