Lightweight heavy coating material for automobile non-woven carpet and preparation method thereof

Abstract

The application discloses a light-weight heavy coating material for automobile non-woven carpet and a preparation method thereof, and belongs to the technical field of carpet production. First, the coating material comprises the following raw materials in parts by mass: 100 parts of EVA resin, 18-22 parts of modified shell powder, 13-15 parts of modified mildew-resistant agent, 4-5 parts of foaming agent, 2-3 parts of zinc stearate, 2-3 parts of cross-linking agent and 1-2 parts of pore-forming agent. The prepared heavy coating material has excellent sound insulation performance and excellent mildew resistance through the addition of the self-prepared modified shell powder and modified mildew-resistant agent. Moreover, the heavy coating material is prepared from light-weight raw materials, and the prepared heavy coating material has the advantage of light weight after foaming and molding.

Description

Technical Field

[0001] This invention belongs to the field of carpet manufacturing technology, specifically relating to a lightweight heavy-duty coating material for automotive nonwoven carpets and its preparation method. Background Technology

[0002] With increasing demands for automotive comfort, in-vehicle acoustic comfort has become a crucial design indicator and a key research topic for component suppliers. Among these components, in-vehicle carpets are a major acoustic element, making a significant contribution to the overall acoustic performance of the vehicle.

[0003] Commonly used car interior carpets are tufted carpets, which are generally made of three layers: a nylon tufted surface, a recoating layer, and a non-woven fabric, which are then laminated and hot-pressed together. The main substrate of the recoating layer is a copolymer of ethylene and vinyl acetate (EVA resin). EVA resin has excellent flexibility, impact resistance, filler compatibility, and heat-sealing properties. The recoating layer, prepared through a foaming process, has abundant microporous structures for sound absorption, and the sound insulation effect of the tufted carpet also relies on this recoating layer.

[0004] However, due to the presence of micropores, the recoating layer also becomes a breeding ground for mold. Furthermore, the relatively enclosed space inside a car with poor air circulation provides an ideal environment for mold growth. Therefore, improving the recoating material to enhance its anti-mold performance can help maintain the health of car users. Summary of the Invention

[0005] This invention provides a lightweight recoating material for automotive nonwoven carpets and its preparation method, which further improves the anti-mildew performance of the recoating material while ensuring its sound absorption performance.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A lightweight, heavy-duty coating material for automotive nonwoven carpets comprises the following raw materials in parts by weight:

[0008] 100 parts EVA resin, 18-22 parts modified shell powder, 13-15 parts modified mildew inhibitor, 4-5 parts foaming agent, 2-3 parts zinc stearate, 2-3 parts crosslinking agent, 1-2 parts cell opener;

[0009] The modified antifungal agent is prepared by the following steps:

[0010] B1. Add anhydrous ethanol to pure water at a volume ratio of 2:1, stir and mix to obtain an ethanol solution, then add β-cyclodextrin to the ethanol solution, heat the system to 55-60℃, and stir at a constant temperature until the solid components are completely dissolved to obtain a cyclodextrin solution.

[0011] B2. Add iodopropynyl n-butylcarbamate to anhydrous ethanol and stir to obtain the active component;

[0012] B3. Add the active component dropwise to the cyclodextrin solution, stir for 1-2 hours, let it stand at 4°C for 24 hours, and then obtain the modified antifungal agent after vacuum filtration, washing and drying.

[0013] Furthermore, the ratio of ethanol solution to β-cyclodextrin in the ethanol solution is 1L:0.06-0.07mol.

[0014] Furthermore, the ratio of anhydrous ethanol to iodopropynyl n-butylcarbamate in the active component is 1L:0.45-0.55g.

[0015] Furthermore, the modified seashell powder is prepared by the following steps:

[0016] A1. Grind the washed and dried seashells through an 80-100 mesh sieve to obtain seashell powder. Immerse the seashell powder in a 10% sodium hydroxide aqueous solution and ultrasonically stir for 1-2 hours. Then heat and reflux at 70-80℃ for 2-4 hours. After completion, let it stand and cool to room temperature, filter, take the solid component, wash the solid component with pure water until neutral, and then dry it in a constant temperature drying oven at 50-60℃ until constant weight to obtain alkali-treated seashell powder.

[0017] A2. Add 3-glycidyloxypropyltrimethoxysilane to an 80% ethanol solution by stirring to obtain a modified solution. Immerse the alkali-treated shell powder in the modified solution and stir at room temperature for 4-5 hours. After stirring, dry to constant weight to obtain modified shell powder.

[0018] Furthermore, the ratio of ethanol solution to 3-glycidyloxypropyltrimethoxysilane in the modified solution is 100 mL: 13-15 g.

[0019] Furthermore, the ratio of alkali-treated shell powder to modified solution in A2 is 1g:10mL.

[0020] Furthermore, the foaming agent is one of sodium α-olefin sulfonate and azodicarbonamide.

[0021] Furthermore, the crosslinking agent is one of triethanolamine and benzoyl peroxide.

[0022] Furthermore, the pore-opening agent is one of AK-9905 and AK9902.

[0023] As a further aspect of the present invention, a method for preparing a lightweight heavy-duty coating material for automotive nonwoven carpets includes the following steps:

[0024] Weigh each raw material according to the above-mentioned mass proportions, then add EVA resin, modified shell powder, modified mildew inhibitor and zinc stearate to a mixer and plasticize for 8-10 minutes. Then add foaming agent, crosslinking agent and cell opener and mix for 1-2 hours. After mixing, place it in a two-roll mill to make sheets to obtain heavy-duty coating material sheets. Then add the heavy-duty coating material sheets to a molding foaming machine and place it at 150-155℃ for 4-5 minutes to foam. After completion, cool to room temperature and discharge to obtain lightweight heavy-duty coating material for automotive non-woven carpets.

[0025] The beneficial effects of this invention are:

[0026] This invention provides a lightweight recoating material for automotive nonwoven carpets. By adding self-made modified shell powder and modified anti-mildew agent, the prepared recoating material, after testing, exhibits both excellent sound insulation and superior anti-mildew properties. Furthermore, the recoating material of this invention uses only lightweight raw materials, and after foaming and molding, the prepared recoating material has the advantage of being lightweight. The specific principle is as follows:

[0027] First, the recoating material of this invention incorporates self-made modified shell powder. Shell powder is a natural biomineralized organic-inorganic hybrid composite material with numerous crevices and grooves on its surface. The addition of shell powder improves the sound insulation performance of the recoating material. Simultaneously, the main component of shell powder is calcium carbonate, which has natural anti-mildew properties due to its alkaline nature, inhibiting mold growth. Furthermore, shell powder contains chitin and other components with antibacterial and anti-mildew properties. Compared to other inorganic fillers, using shell powder as a filler not only increases the modulus but also results in a smaller increase in specific gravity, making it lighter. However, natural shell powder has poor compatibility with organic polymers. Therefore, this invention sequentially treats the shell powder with alkali and then modifies it with a coupling agent. The aim is to improve the surface activity of the shell powder by coating it with a coupling agent, thereby enhancing the compatibility between the modified shell powder and the EVA resin substrate.

[0028] Then, a self-made modified antifungal agent is added to the recoating material of the present invention. The core of the modified antifungal agent prepared in this invention lies in iodopropynyl n-butylcarbamate (IPBC). Iodopropynyl n-butylcarbamate has iodine atoms on its molecular chain. Iodine atoms can undergo an oxidation reaction with microbial cells, causing the sulfhydryl groups in the cells to oxidize and the tyrosine to iodinate, thus losing protein activity, thereby exhibiting excellent antifungal and antibacterial properties. However, IPBC itself has poor water solubility and is easily decomposed. Therefore, the present invention uses β-cyclodextrin to encapsulate IPBC. β-cyclodextrin has a unique hollow structure and the characteristics of being hydrophobic inside and hydrophilic outside. The present invention utilizes the characteristics of β-cyclodextrin to use the poorly water-soluble IPBC as a small molecule guest and β-cyclodextrin as the inclusion host, and prepares the modified antifungal agent by co-precipitation. The aim is to improve the antifungal performance of the recoating material by improving the stability of the antifungal agent. The recoating material with the added modified antifungal agent shows excellent antifungal performance. Attached Figure Description

[0029] The present invention will now be further described with reference to the accompanying drawings.

[0030] Figure 1 This is a line graph showing the sound absorption coefficient results in Test Example 1 of this invention. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1

[0032] Preparation of modified seashell powder:

[0033] A1. The washed and dried seashells were crushed and ground through an 80-mesh sieve to obtain seashell powder. The seashell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory preparation) and ultrasonically stirred for 1 hour. Then, it was heated and stirred under reflux at 70°C for 2 hours. After completion, it was allowed to stand and cool to room temperature, filtered, and the solid component was taken. The solid component was then washed with pure water until neutral and then dried in a constant temperature drying oven at 50°C until constant weight to obtain alkali-treated seashell powder.

[0034] A2. 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) was added to an 80% ethanol solution (laboratory preparation) with stirring to obtain a modified solution. The volume ratio of the 80% ethanol solution to 3-glycidyloxypropyltrimethoxysilane was 100 mL: 13 g. The alkali-treated shell powder was then immersed in the modified solution at a solid-liquid ratio of 1 g: 10 mL. The mixture was stirred at room temperature for 4 hours. After stirring, it was placed in a 50℃ constant temperature drying oven and dried to constant weight to obtain modified shell powder. Example 2

[0035] Preparation of modified seashell powder:

[0036] A1. The washed and dried seashells were crushed and ground through a 100-mesh sieve to obtain seashell powder. The seashell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory preparation) and ultrasonically stirred for 2 hours. Then, it was heated and stirred under reflux at 75°C for 4 hours. After completion, it was allowed to stand and cool to room temperature, filtered, and the solid component was taken. The solid component was then washed with pure water until neutral and then dried in a constant temperature drying oven at 55°C until constant weight to obtain alkali-treated seashell powder.

[0037] A2. 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) was added to an 80% ethanol solution (laboratory preparation) with stirring to obtain a modified solution. The volume ratio of the 80% ethanol solution to 3-glycidyloxypropyltrimethoxysilane was 100 mL: 14 g. The alkali-treated shell powder was then immersed in the modified solution at a solid-liquid ratio of 1 g: 10 mL. The mixture was stirred at room temperature for 5 hours. After stirring, it was dried in a 55℃ constant temperature drying oven until constant weight was obtained to obtain modified shell powder. Example 3

[0038] Preparation of modified seashell powder:

[0039] A1. The washed and dried seashells were crushed and ground through a 100-mesh sieve to obtain seashell powder. The seashell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory preparation) and ultrasonically stirred for 2 hours. Then, it was heated and stirred under reflux at 80°C for 4 hours. After completion, it was allowed to stand and cool to room temperature, filtered, and the solid component was taken. The solid component was then washed with pure water until neutral and then dried in a constant temperature drying oven at 60°C until constant weight to obtain alkali-treated seashell powder.

[0040] A2. 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) was added to an 80% ethanol solution (laboratory preparation) with stirring to obtain a modified solution. The volume ratio of the 80% ethanol solution to 3-glycidyloxypropyltrimethoxysilane was 100 mL: 15 g. The alkali-treated shell powder was then immersed in the modified solution at a solid-liquid ratio of 1 g: 10 mL. The mixture was stirred at room temperature for 5 hours. After stirring, it was placed in a 60℃ constant temperature drying oven and dried to constant weight to obtain modified shell powder. Example 4

[0041] Preparation of modified antifungal agents:

[0042] B1. Add anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to pure water at a volume ratio of 2:1, stir and mix for 20 min to obtain an ethanol solution, then add 0.06 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1 L of the above ethanol solution, heat the system to 55℃, and stir at a constant temperature until the solid components are completely dissolved to obtain a cyclodextrin solution;

[0043] B2. Add 0.45g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1L of anhydrous ethanol (AR; 99.7%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), stir and mix for 20min to obtain the active component;

[0044] B3. Add the active component dropwise to the cyclodextrin solution. After the addition is complete, stir for 1 hour and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain the solid component. Wash the solid component three times with anhydrous ethanol and then dry it in a 40°C constant temperature drying oven until constant weight to obtain the modified antifungal agent. Example 5

[0045] Preparation of modified antifungal agents:

[0046] B1. Add anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to pure water at a volume ratio of 2:1, stir and mix for 30 min to obtain an ethanol solution, then add 0.065 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1 L of the above ethanol solution, heat the system to 60℃, and stir at a constant temperature until the solid components are completely dissolved to obtain a cyclodextrin solution;

[0047] B2. Add 0.50 g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1 L of anhydrous ethanol (AR; 99.7%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), stir and mix for 30 min to obtain the active component;

[0048] B3. Add the active component dropwise to the cyclodextrin solution. After the addition is complete, stir for 2 hours and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain the solid component. Wash the solid component three times with anhydrous ethanol and then dry it in a 45°C constant temperature drying oven until constant weight to obtain the modified antifungal agent. Example 6

[0049] Preparation of modified antifungal agents:

[0050] B1. Add anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to pure water at a volume ratio of 2:1, stir and mix for 30 min to obtain an ethanol solution, then add 0.07 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1 L of the above ethanol solution, heat the system to 60℃, and stir at a constant temperature until the solid components are completely dissolved to obtain a cyclodextrin solution;

[0051] B2. Add 0.55g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Sinopharm Chemical Reagent Co., Ltd.) to 1L of anhydrous ethanol (AR; 99.7%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.), stir and mix for 30min to obtain the active component;

[0052] B3. Add the active component dropwise to the cyclodextrin solution. After the addition is complete, stir for 2 hours and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain the solid component. Wash the solid component three times with anhydrous ethanol and then dry it in a 50°C constant temperature drying oven until constant weight to obtain the modified antifungal agent. Example 7

[0053] A method for preparing a lightweight recoating material for automotive nonwoven carpets:

[0054] First, the lightweight heavy-duty coating material for automotive nonwoven carpets comprises the following raw materials by weight:

[0055] 100 parts EVA resin, 18 parts modified shell powder prepared in Example 1, 13 parts modified antifungal agent prepared in Example 4, 4 parts foaming agent, 2 parts zinc stearate, 2 parts crosslinking agent, and 1 part cell opener;

[0056] Among them, EVA resin (model 7140F) was purchased from Formosa Plastics Industrial (Ningbo) Co., Ltd.; foaming agent was sodium α-olefin sulfonate (92%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); crosslinking agent was triethanolamine (98%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); cell opener was AK-9905, purchased from Jiangsu Meiside Chemical Co., Ltd.

[0057] Then, the preparation method includes the following steps:

[0058] Weigh each raw material according to the above-mentioned mass proportions, then add EVA resin, modified shell powder prepared in Example 1, modified antifungal agent prepared in Example 4 and zinc stearate into a mixer and plasticize for 8 minutes. Then add foaming agent, crosslinking agent and cell opener and mix for 1 hour. After mixing, place it in a two-roll mill to make sheets to obtain a recoated material sheet. Then add the recoated material sheet to a molding foaming machine and place it at 150°C for 4 minutes to foam. After completion, cool to room temperature and discharge to obtain a lightweight recoated material for automotive nonwoven carpets. Example 8

[0059] A method for preparing a lightweight recoating material for automotive nonwoven carpets:

[0060] First, the lightweight heavy-duty coating material for automotive nonwoven carpets comprises the following raw materials by weight:

[0061] 100 parts EVA resin, 20 parts modified shell powder prepared in Example 2, 15 parts modified antifungal agent prepared in Example 5, 5 parts foaming agent, 2 parts zinc stearate, 2 parts crosslinking agent, and 1 part cell opener;

[0062] Among them, EVA resin (model 7140F) was purchased from Formosa Plastics Industrial (Ningbo) Co., Ltd.; the foaming agent was azodicarbonamide (99%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); the crosslinking agent was benzoyl peroxide (99%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); and the cell opener was AK-9905, purchased from Jiangsu Meiside Chemical Co., Ltd.

[0063] Then, the preparation method includes the following steps:

[0064] Weigh each raw material according to the above-mentioned mass proportions, then add EVA resin, modified shell powder prepared in Example 2, modified antifungal agent prepared in Example 5 and zinc stearate into a mixer and plasticize for 10 minutes. Then add foaming agent, crosslinking agent and cell opener and mix for 2 hours. After mixing, place it in a two-roll mill to make sheets to obtain a recoated material sheet. Then add the recoated material sheet to a molding foaming machine and place it at 154°C for 5 minutes to foam. After completion, cool to room temperature and discharge to obtain a lightweight recoated material for automotive nonwoven carpets. Example 9

[0065] A method for preparing a lightweight recoating material for automotive nonwoven carpets:

[0066] First, the lightweight heavy-duty coating material for automotive nonwoven carpets comprises the following raw materials by weight:

[0067] 100 parts EVA resin, 22 parts modified shell powder prepared in Example 3, 15 parts modified antifungal agent prepared in Example 6, 5 parts foaming agent, 3 parts zinc stearate, 3 parts crosslinking agent, and 2 parts cell opener;

[0068] Among them, EVA resin (model 7140F) was purchased from Formosa Plastics Industrial (Ningbo) Co., Ltd.; the foaming agent was azodicarbonamide (99%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); the crosslinking agent was benzoyl peroxide (99%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); and the cell opener was AK-9905, purchased from Jiangsu Meiside Chemical Co., Ltd.

[0069] Then, the preparation method includes the following steps:

[0070] Weigh each raw material according to the above-mentioned mass proportions, then add EVA resin, modified shell powder prepared in Example 3, modified antifungal agent prepared in Example 6 and zinc stearate into a mixer and plasticize for 10 minutes. Then add foaming agent, crosslinking agent and cell opener and mix for 2 hours. After mixing, place it in a two-roll mill to make sheets to obtain a recoating material sheet. Then add the recoating material sheet into a molding foaming machine and place it at 155°C for 5 minutes to foam. After completion, cool to room temperature and discharge to obtain a lightweight recoating material for automotive nonwoven carpets.

[0071] Comparative Example 1

[0072] Comparative Example 1 served as the control group for Example 8. The modified shell powder prepared in Example 2 of Example 8 was removed, while the remaining raw materials, raw material amounts, and preparation steps remained consistent with those in Example 8. Finally, a lightweight recoating material for automotive nonwoven carpets was obtained.

[0073] Comparative Example 2

[0074] Comparative Example 2 served as the control group for Example 8. The modified antifungal agent prepared in Example 5 of Example 8 was replaced with iodopropynyl n-butylcarbamate. The remaining raw materials, raw material amounts, and preparation steps remained consistent with those in Example 8, ultimately yielding a lightweight recoating material for automotive nonwoven carpets.

[0075] Comparative Example 3

[0076] Comparative Example 3 served as the control group for Example 8. The modified antifungal agent prepared in Example 5 of Example 8 was removed, while the remaining raw materials, raw material amounts, and preparation steps remained consistent with those in Example 8. Finally, a lightweight recoating material for automotive nonwoven carpets was obtained.

[0077] Test Example 1

[0078] The performance of the recoating materials prepared in Examples 7 to 9 and Comparative Examples 1 to 3 was tested. The performance testing process is as follows, and the test results are shown in Table 1 and... Figure 1 As shown:

[0079] Sound absorption coefficient: The sound absorption coefficients of the recoating materials prepared in Examples 7-9 and Comparative Examples 1-3 were measured using a reverberation chamber, wherein the internal volume of the reverberation chamber was 6 m³. 3 The effective test frequency range is 250–10000 Hz, and the area of ​​the recoating material is 1.2 m². 2 The edges of the recoating material are sealed with flat aluminum strips to reduce the impact of the material edges on sound absorption. The sound absorption coefficient of the recoating material is calculated using the following formula, and the calculation results are shown below. Figure 1 The formula for calculating the sound absorption coefficient α is:

[0080] α = 0.161(V / A)(1 / t1 - 1 / t2);

[0081] Where V is the internal volume of the reverberation chamber; A is the area of ​​the recoating material; t1 is the time required for the sound pressure level in the reverberation chamber to decrease by 60 dB from its initial state after the recoating material is placed in; and t2 is the time required for the sound pressure level in the reverberation chamber to decrease by 60 dB from its initial state when the chamber is empty.

[0082] Anti-mildew performance: The anti-mildew level of the recoating material was tested according to the test methods in the national standard GB / T 24128-2018 "Evaluation of Anti-mildew Effect of Plastic Anti-mildew Agents". The test microorganisms were *Aspergillus niger*, *Paecilomyces wani*, and *Chaetomium globulus*, all commonly found in automotive interiors, purchased from CGMCC (China General Microbiological Culture Collection Center). The test sample was a circular piece of recoating material with a diameter of 2 cm and a thickness of 5 mm. All other test methods and procedures were carried out according to the national standard. The anti-mildew levels of the recoating materials prepared in Examples 7-9 and Comparative Examples 1-3 were tested for *Aspergillus niger*, *Paecilomyces wani*, and *Chaetomium globulus*. The test results are shown in Table 1 below.

[0083] Table 1

[0084]

[0085] Depend on Figure 1As can be seen from Table 1, the recoating materials prepared in Examples 7 to 9 and Comparative Examples 1 to 3 of the present invention all have excellent sound insulation and sound absorption effects. Furthermore, the present invention significantly improves the anti-mildew performance of the recoating materials by adding a modified anti-mildew agent.

[0086] It should be noted that, in this document, terms such as “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.

[0087] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight heavy-duty coating material for automotive nonwoven carpets, characterized in that, The raw materials include the following parts by weight: 100 parts EVA resin, 18-22 parts modified shell powder, 13-15 parts modified mildew inhibitor, 4-5 parts foaming agent, 2-3 parts zinc stearate, 2-3 parts crosslinking agent, and 1-2 parts cell opener. The modified antifungal agent is prepared by the following steps: B1. Add anhydrous ethanol to pure water at a volume ratio of 2:1, stir and mix to obtain an ethanol solution, then add β-cyclodextrin to the ethanol solution, heat the system to 55-60℃, and stir at a constant temperature until the solid components are completely dissolved to obtain a cyclodextrin solution. B2. Add iodopropynyl n-butylcarbamate to anhydrous ethanol and stir to obtain the active component; B3. Add the active component dropwise to the cyclodextrin solution, stir for 1-2 hours, let stand at 4°C for 24 hours, and then obtain the modified antifungal agent after vacuum filtration, washing and drying. The modified seashell powder is prepared by the following steps: A1. Grind the washed and dried seashells through an 80-100 mesh sieve to obtain seashell powder. Immerse the seashell powder in a 10% sodium hydroxide aqueous solution and ultrasonically stir for 1-2 hours. Then heat and reflux at 70-80℃ for 2-4 hours. After completion, let it stand and cool to room temperature, filter, take the solid component, wash the solid component with pure water until neutral, and then dry it in a constant temperature drying oven at 50-60℃ until constant weight to obtain alkali-treated seashell powder. A2. Add 3-glycidyloxypropyltrimethoxysilane to an 80% ethanol solution by stirring to obtain a modified solution. Immerse the alkali-treated shell powder in the modified solution and stir at room temperature for 4-5 hours. After stirring, dry to constant weight to obtain modified shell powder.

2. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The ratio of ethanol solution to β-cyclodextrin in the cyclodextrin solution is 1L:0.06-0.07mol.

3. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The ratio of anhydrous ethanol to iodopropynyl n-butylcarbamate in the active component is 1L:0.45-0.55g.

4. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The ratio of ethanol solution to 3-glycidyloxypropyltrimethoxysilane in the modified solution is 100 mL: 13-15 g.

5. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The ratio of alkaline-treated shell powder to modified solution described in A2 is 1g:10mL.

6. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The foaming agent is one of sodium α-olefin sulfonate and azodicarbonamide.

7. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The crosslinking agent is one of triethanolamine and benzoyl peroxide.

8. The lightweight heavy-duty coating material for automotive nonwoven carpets according to claim 1, characterized in that, The pore-opening agent is one of AK-9905 and AK9902.

9. A method for preparing a lightweight recoating material for automotive nonwoven carpets according to any one of claims 1 to 8, characterized in that, Includes the following steps: Weigh each raw material according to the above-mentioned mass proportions, then add EVA resin, modified shell powder, modified mildew inhibitor and zinc stearate to a mixer and plasticize for 8-10 minutes. Then add foaming agent, crosslinking agent and cell opener and mix for 1-2 hours. After mixing, place it in a two-roll mill to make sheets to obtain heavy-duty coating material sheets. Then add the heavy-duty coating material sheets to a molding foaming machine and place it at 150-155℃ for 4-5 minutes to foam. After completion, cool to room temperature and discharge to obtain lightweight heavy-duty coating material for automotive non-woven carpets.

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