Lightweight heavy coating material for automobile non-woven fabric carpet and preparation method of lightweight heavy coating material

Abstract

The invention discloses a light-weight heavy coating material for an automobile non-woven fabric carpet and a preparation method of the light-weight heavy coating material, and belongs to the technical field of carpet production.The light-weight heavy coating material is prepared from, by mass, 100 parts of EVA resin, 18-22 parts of modified shell powder, 13-15 parts of modified mildew preventive, 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 opening agent; according to the invention, by adding the self-made modified shell powder and the modified mildew preventive, detection shows that the prepared heavy coating material has excellent sound insulation performance and excellent mildew resistance, and in addition, the heavy coating material adopts light raw materials, and after foaming molding, the prepared heavy coating material has the advantage of light weight.

Description

Technical Field

[0001] The invention belongs to the technical field of carpet production, and in particular relates to a lightweight heavy-coating material for automobile non-woven carpet and a preparation method thereof. Background Art

[0002] As people's requirements for car comfort continue to increase, in-car acoustic comfort has become one of the important design indicators and an important research topic for various parts suppliers. Among them, in-car carpet is also a major acoustic component, which makes an important contribution to the acoustic performance of the entire vehicle.

[0003] Commonly used in-car carpets are tufted carpets, which are generally made of three layers of nylon tufted soft surface, heavy coating and non-woven fabric after composite hot pressing. Among them, the main base material of the heavy coating is ethylene-vinyl acetate (EVA resin) copolymer. EVA resin has excellent flexibility, impact resistance, filler compatibility and heat sealing. The heavy coating prepared by the foaming process has a rich microporous structure for sound absorption. The sound insulation effect of the tufted carpet is also achieved by the heavy coating.

[0004] However, due to the presence of micropores, heavy coatings also become a breeding ground for mold. In addition, the space inside a car is relatively closed and the air circulation is poor, providing an ideal environment for the growth of mold. Therefore, improving the heavy coating material and enhancing its anti-mildew performance will help maintain the health of car users. Summary of the invention

[0005] The present invention provides a lightweight heavy coating material for automobile non-woven carpet and a preparation method thereof, which further improves the anti-mildew performance of the heavy coating material on the basis of ensuring the sound absorption performance of the heavy coating material.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A lightweight heavy-coating material for automotive non-woven carpets, comprising the following raw materials in parts by weight: 100 parts of EVA resin, 18-22 parts of modified shell powder, 13-15 parts of modified mildew inhibitor, 4-5 parts of foaming agent, 2-3 parts of zinc stearate, 2-3 parts of cross-linking agent, 1-2 parts of pore opening agent; The modified mildew inhibitor 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° C., and stir at a constant temperature until the solid component is completely dissolved to obtain a cyclodextrin solution; B2, adding iodopropynyl n-butylcarbamate to anhydrous ethanol, stirring to obtain an active component; B3. Add the active component dropwise into the cyclodextrin solution, stir for 1-2 hours, and then place it at 4°C for 24 hours. Then, vacuum filter, wash and dry to obtain a modified mildew inhibitor.

[0007] Furthermore, the dosage ratio of the ethanol solution to β-cyclodextrin in the ethanol solution is 1L:0.06-0.07mol.

[0008] Furthermore, the usage ratio of anhydrous ethanol and iodopropynyl n-butylcarbamate in the active component is 1L:0.45-0.55g.

[0009] Furthermore, the modified shell powder is prepared by the following steps: A1. Grind the washed and dried shells through an 80-100 mesh sieve to obtain shell powder, immerse the shell powder in a 10% sodium hydroxide aqueous solution by mass, stir ultrasonically for 1-2 hours, and then heat under reflux at 70-80°C and stir for 2-4 hours. After completion, 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°C to constant weight to obtain alkali-treated shell powder; A2. Add 3-glycidyloxypropyltrimethoxysilane to an ethanol solution with a volume fraction of 80% with stirring to obtain a modified solution, and then immerse the alkali-treated shell powder in the modified solution, stir at room temperature for 4 to 5 hours, and after stirring, dry to constant weight to obtain modified shell powder.

[0010] Furthermore, the usage ratio of the ethanol solution and 3-glycidyloxypropyltrimethoxysilane in the modified solution is 100 mL: 13-15 g.

[0011] Furthermore, the dosage ratio of the alkali-treated shell powder and the modified solution in A2 is 1g:10mL.

[0012] Furthermore, the foaming agent is one of sodium α-olefin sulfonate and azodicarbonamide.

[0013] Furthermore, the cross-linking agent is one of triethanolamine and benzoyl peroxide.

[0014] Furthermore, the pore opening agent is one of AK-9905 and AK9902.

[0015] As a further embodiment of the present invention, a method for preparing a lightweight heavy-coating material for a non-woven carpet for an automobile comprises the following steps: Weigh each raw material according to the above-mentioned mass proportion, then add EVA resin, modified shell powder, modified mildew inhibitor and zinc stearate into an internal mixer and plasticize for 8 to 10 minutes, then add foaming agent, cross-linking agent and pore opening agent thereto, mix for 1 to 2 hours, after mixing, place in a double-roll open mill for refining and sheeting to obtain a heavy coating material sheet, then add the heavy coating material sheet into a molding foaming machine, place at 150 to 155° C. for foaming for 4 to 5 minutes, after completion, cool to room temperature, discharge the material, and obtain a lightweight heavy coating material for automotive non-woven carpets.

[0016] Beneficial effects of the present invention: The present invention provides a lightweight heavy coating material for automotive non-woven carpets. By adding homemade modified shell powder and modified mildew inhibitor, it is found that the prepared heavy coating material has both excellent sound insulation performance and excellent mildew resistance. Moreover, the heavy coating material of the present invention uses lightweight raw materials. After foaming and molding, the prepared heavy coating material has the advantage of being lightweight. The specific principle is as follows: First, the heavy coating material of the present invention is added with self-made modified shell powder, wherein the shell powder is a natural biomineralized organic-inorganic hybrid composite material, and its surface has a large number of gaps and grooves. The addition of shell powder can improve the sound insulation performance of the heavy coating material; at the same time, the main component of the shell powder is calcium carbonate, and calcium carbonate has a natural mildew-proof effect, because the alkaline properties of calcium carbonate can inhibit the growth of mold, and at the same time, the shell powder contains chitin and other antibacterial and mildew-proof ingredients; and, compared with other inorganic fillers, the use of shell powder as a filler can not only improve the modulus, but also increase the specific gravity less, and be more lightweight. However, the compatibility of natural shell powder with organic polymers is poor. Therefore, the present invention sequentially performs alkali treatment and coupling agent modification treatment on the shell powder, aiming to improve the surface activity of the shell powder by coating the coupling agent on the surface of the shell powder, thereby improving the compatibility of the modified shell powder with the EVA resin substrate.

[0017] Then, a self-made modified mildew preventer is added to the heavy coating material of the present invention. The effective core of the modified mildew preventer prepared by the present invention is iodopropynyl n-butylcarbamate (IPBC). There are iodine atoms on the molecular chain of iodopropynyl n-butylcarbamate. The iodine atoms can react with microbial cells to oxidize the sulfhydryl groups in the cells and iodinate tyrosine to lose protein activity, thereby showing excellent mildew and antibacterial properties. However, IPBC itself has poor water solubility and is easy to decompose. Therefore, the present invention uses β-cyclodextrin to coat IPBC, wherein β-cyclodextrin has a unique hollow structure and the characteristics of internal hydrophobicity and external hydrophilicity. The present invention uses the characteristics of β-cyclodextrin, takes IPBC with poor water solubility as a small molecule object, takes β-cyclodextrin as an inclusion body, and adopts a coprecipitation method to prepare a modified mildew preventer, aiming to improve the mildew preventer by improving the stability of the mildew preventer, and then improve the mildew preventer of the heavy coating material. After testing, the heavy coating material with the modified mildew preventer shows excellent mildew preventer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a line graph of the sound absorption coefficient results in Test Example 1 of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Embodiment 1

[0021] Preparation of modified shell powder: A1. The cleaned and dried shells were crushed and ground through an 80-mesh sieve to obtain shell powder, and the shell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory configuration) with ultrasonic stirring for 1 hour, and then heated under reflux and stirred at 70°C for 2 hours. After completion, the shell powder 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 placed in a 50°C constant temperature drying oven and dried to constant weight to obtain alkali-treated shell powder; A2. Add 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) to an 80% by volume ethanol solution (laboratory configuration) with stirring to obtain a modified solution, wherein the volume fraction of 80% by volume ethanol solution and 3-glycidyloxypropyltrimethoxysilane are used in a ratio of 100 mL:13 g, and then alkali-treated shell powder is immersed in the modified solution at a solid-liquid ratio of 1 g:10 mL, stirred at room temperature for 4 hours, and after stirring, placed in a 50°C constant temperature drying oven and dried to constant weight to obtain modified shell powder. Embodiment 2

[0022] Preparation of modified shell powder: A1. The cleaned and dried shells were crushed and ground through a 100-mesh sieve to obtain shell powder, and the shell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory configuration) with ultrasonic stirring for 2 hours, and then heated under reflux and stirred at 75°C for 4 hours. After completion, the shell powder was allowed to stand and cool to room temperature, filtered, and the solid component was taken. The solid component was washed with pure water until neutral, and then placed in a 55°C constant temperature drying oven and dried to constant weight to obtain alkali-treated shell powder; A2. Add 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) to an 80% by volume ethanol solution (laboratory configuration) with stirring to obtain a modified solution, wherein the volume fraction of 80% by volume ethanol solution and 3-glycidyloxypropyltrimethoxysilane are used in a ratio of 100 mL:14 g. Then alkali-treated shell powder is immersed in the modified solution at a solid-liquid ratio of 1 g:10 mL, stirred at room temperature for 5 hours, and after stirring, placed in a 55°C constant temperature drying oven and dried to constant weight to obtain modified shell powder. Embodiment 3

[0023] Preparation of modified shell powder: A1. The cleaned and dried shells were crushed and ground through a 100-mesh sieve to obtain shell powder, and the shell powder was immersed in a 10% sodium hydroxide aqueous solution (laboratory configuration) with ultrasonic stirring for 2 hours, and then heated under reflux and stirred at 80°C for 4 hours. After completion, the shell powder 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 placed in a 60°C constant temperature drying oven and dried to constant weight to obtain alkali-treated shell powder; A2. Add 3-glycidyloxypropyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) to an 80% by volume ethanol solution (laboratory configuration) with stirring to obtain a modified solution, wherein the volume fraction of 80% by volume ethanol solution and 3-glycidyloxypropyltrimethoxysilane are used in a ratio of 100 mL:15 g. Then alkali-treated shell powder is immersed in the modified solution at a solid-liquid ratio of 1 g:10 mL, stirred at room temperature for 5 hours, and after stirring, placed in a 60°C constant temperature drying oven and dried to constant weight to obtain modified shell powder. Embodiment 4

[0024] Preparation of modified mildew inhibitor: B1. Anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was added to pure water at a volume ratio of 2:1, and the mixture was stirred for 20 min to obtain an ethanol solution. 0.06 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was then added to 1 L of the above ethanol solution, and the system was heated to 55° C. and stirred at a constant temperature until the solid component was completely dissolved to obtain a cyclodextrin solution. B2. Add 0.45 g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Shanghai MacLean Biochemical Technology Co., Ltd.) to 1 L of anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.), and stir for 20 minutes to obtain an active ingredient; B3. Add the active component dropwise to the cyclodextrin solution. After the addition is completed, stir for 1 hour, and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain a solid component. Wash the solid component three times with anhydrous ethanol, and then dry it in a 40°C constant temperature drying oven to constant weight to obtain a modified mildew inhibitor. Embodiment 5

[0025] Preparation of modified mildew inhibitor: B1. Anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was added to pure water at a volume ratio of 2:1, and the mixture was stirred for 30 min to obtain an ethanol solution. 0.065 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was then added to 1 L of the above ethanol solution, and the system was heated to 60° C. and stirred at a constant temperature until the solid component was completely dissolved to obtain a cyclodextrin solution. B2. Add 0.50 g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Shanghai MacLean Biochemical Technology Co., Ltd.) to 1 L of anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.), and stir for 30 minutes to obtain an active ingredient; B3. Add the active component dropwise to the cyclodextrin solution. After the addition is completed, stir for 2 hours, and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain a solid component. Wash the solid component three times with anhydrous ethanol, and then dry it in a 45°C constant temperature drying oven to constant weight to obtain a modified mildew inhibitor. Embodiment 6

[0026] Preparation of modified mildew inhibitor: B1. Anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was added to pure water at a volume ratio of 2:1, and the mixture was stirred for 30 min to obtain an ethanol solution. 0.07 mol of β-cyclodextrin (99.0%; purchased from Sinopharm Chemical Reagent Co., Ltd.) was then added to 1 L of the above ethanol solution, and the system was heated to 60° C. and stirred at a constant temperature until the solid component was completely dissolved to obtain a cyclodextrin solution. B2. Add 0.55 g of iodopropynyl n-butylcarbamate (IPBC; 97%; purchased from Shanghai MacLean Biochemical Technology Co., Ltd.) to 1 L of anhydrous ethanol (AR; 99.7%; purchased from Sinopharm Chemical Reagent Co., Ltd.), and stir for 30 minutes to obtain an active ingredient; B3. Add the active component dropwise to the cyclodextrin solution. After the addition is completed, stir for 2 hours, and then let it stand at 4°C for 24 hours. After standing, vacuum filter to obtain a solid component. Wash the solid component three times with anhydrous ethanol, and then dry it in a 50°C constant temperature drying oven to constant weight to obtain a modified mildew inhibitor. Embodiment 7

[0027] A method for preparing a lightweight heavy coating material for automotive non-woven carpet: First of all, the lightweight heavy coating material for automotive non-woven carpets includes the following raw materials by weight: 100 parts of EVA resin, 18 parts of modified shell powder prepared in Example 1, 13 parts of modified mildew inhibitor prepared in Example 4, 4 parts of foaming agent, 2 parts of zinc stearate, 2 parts of cross-linking agent, and 1 part of pore opening agent; Among them, EVA resin (model 7140F) was purchased from Formosa Plastics Industry (Ningbo) Co., Ltd.; the foaming agent was sodium α-olefin sulfonate (92%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); the cross-linking agent was triethanolamine (98%; purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); the cell opening agent was AK-9905, purchased from Jiangsu Meside Chemical Co., Ltd.; Then, the preparation method comprises the following steps: Weigh each raw material according to the above-mentioned mass parts, then add EVA resin, modified shell powder prepared in Example 1, modified mildew inhibitor prepared in Example 4 and zinc stearate into an internal mixer and plasticize for 8 minutes, then add foaming agent, cross-linking agent and pore opening agent thereto, mix for 1 hour, after mixing, place it in a double-roll open mill for refining and sheeting to obtain a heavy coating material sheet, then add the heavy coating material sheet into a molding foaming machine, place it at 150°C for foaming for 4 minutes, after completion, cool to room temperature, discharge the material, and obtain a lightweight heavy coating material for automotive non-woven carpets. Embodiment 8

[0028] A method for preparing a lightweight heavy coating material for automotive non-woven carpet: First of all, the lightweight heavy coating material for automotive non-woven carpets includes the following raw materials by weight: 100 parts of EVA resin, 20 parts of modified shell powder prepared in Example 2, 15 parts of modified mildew inhibitor prepared in Example 5, 5 parts of foaming agent, 2 parts of zinc stearate, 2 parts of cross-linking agent, and 1 part of pore opening agent; Among them, EVA resin (model 7140F) was purchased from Formosa Plastics (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.); the cell opening agent was AK-9905, purchased from Jiangsu Meside Chemical Co., Ltd.; Then, the preparation method comprises the following steps: Weigh each raw material according to the above-mentioned mass proportion, then add EVA resin, modified shell powder prepared in Example 2, modified mildew inhibitor prepared in Example 5 and zinc stearate into an internal mixer and plasticize for 10 minutes, then add foaming agent, cross-linking agent and pore opening agent thereto, mix for 2 hours, after mixing, place in a double-roll open mill for refining and sheeting to obtain heavy coating material sheet, then add the heavy coating material sheet into a molding foaming machine, place at 154°C for foaming for 5 minutes, after completion, cool to room temperature, discharge, and obtain lightweight heavy coating material for automotive non-woven carpets. Embodiment 9

[0029] A method for preparing a lightweight heavy coating material for automotive non-woven carpet: First of all, the lightweight heavy coating material for automotive non-woven carpets includes the following raw materials by weight: 100 parts of EVA resin, 22 parts of modified shell powder prepared in Example 3, 15 parts of modified mildew inhibitor prepared in Example 6, 5 parts of foaming agent, 3 parts of zinc stearate, 3 parts of cross-linking agent, and 2 parts of pore opening agent; Among them, EVA resin (model 7140F) was purchased from Formosa Plastics (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.); the cell opening agent was AK-9905, purchased from Jiangsu Meside Chemical Co., Ltd.; Then, the preparation method comprises the following steps: Weigh each raw material according to the above-mentioned mass proportion, then add EVA resin, modified shell powder prepared in Example 3, modified mildew inhibitor prepared in Example 6 and zinc stearate into an internal mixer and plasticize for 10 minutes, then add foaming agent, cross-linking agent and pore opening agent thereto, mix for 2 hours, after mixing, place in a double-roll open mill for refining and sheeting to obtain heavy coating material sheet, then add the heavy coating material sheet into a molding foaming machine, place at 155°C for foaming for 5 minutes, after completion, cool to room temperature, discharge, and obtain lightweight heavy coating material for automotive non-woven carpets.

[0030] Comparative Example 1 Comparative Example 1 is the control group of Example 8, in which the modified shell powder prepared in Example 2 of Example 8 is deleted, and the remaining raw materials, raw material amounts and preparation steps are kept consistent with those in Example 8, and finally a lightweight heavy-coated material for automotive non-woven carpets is obtained.

[0031] Comparative Example 2 Comparative Example 2 is the control group of Example 8, in which the modified mildew inhibitor prepared in Example 5 in Example 8 is replaced with iodopropynyl n-butylcarbamate, and the remaining raw materials, raw material amounts and preparation steps are kept consistent with those in Example 8, and finally a lightweight heavy coating material for automotive non-woven carpets is obtained.

[0032] Comparative Example 3 Comparative Example 3 is the control group of Example 8, in which the modified mildew inhibitor prepared in Example 5 in Example 8 is deleted, and the remaining raw materials, raw material amounts and preparation steps are kept consistent with those in Example 8, and finally a lightweight heavy coating material for automotive non-woven carpets is obtained.

[0033] Test Example 1 The heavy coating materials prepared in Examples 7 to 9 and Comparative Examples 1 to 3 were subjected to performance tests. The performance test process is as follows. The test results are shown in Tables 1 and Figure 1 As shown: Sound absorption coefficient: The sound absorption coefficient of the heavy coating materials prepared in Examples 7 to 9 and Comparative Examples 1 to 3 was measured using a reverberation box, wherein the internal volume of the reverberation box was 6 m 3 , the effective test frequency range is 250~10000Hz, the area of ​​heavy coating material is 1.2m 2The heavy coating material is sealed at the edge with a flat aluminum strip to reduce the impact of the material edge on sound absorption. The sound absorption coefficient of the heavy coating material is calculated by the following formula. The calculation results are shown below: Figure 1 , the calculation formula of sound absorption coefficient α is: α=0.161(V / A)(1 / t1-1 / t2); Wherein, V is the internal volume of the reverberation box; A is the area of ​​the heavy coating material; t1 is the time required for the sound pressure level in the reverberation box to decay by 60dB from the initial state after the heavy coating material is placed; t2 is the time required for the sound pressure level in the reverberation box to decay by 60dB from the initial state when the reverberation box is in an empty field state.

[0034] Mildew resistance: The mildew resistance grade of the heavy coating material was tested with reference to the test method in the national standard GB / T 24128-2018 "Evaluation of the Mildew Resistance Effect of Plastic Mildew Repellents", wherein the test microorganisms were Aspergillus niger, Paecilomyces variotii and Chaetomium globosum, which are common in automobiles, all purchased from CGMCC (China General Microbiological Culture Collection Management Center). Among them, the test sample used as the test was a heavy coating material disc with a diameter of 2 cm and a thickness of 5 mm. The remaining test methods and steps were carried out in accordance with the national standard. The heavy coating materials prepared in Examples 7 to 9 and Comparative Examples 1 to 3 were tested for mildew resistance grades of Aspergillus niger, Paecilomyces variotii and Chaetomium globosum, and the test results are shown in Table 1 below.

[0035] Table 1

[0036] Depend on Figure 1 As can be seen from Table 1, the heavy coating materials prepared by Examples 7 to 9 of the present invention and Comparative Examples 1 to 3 all have excellent sound insulation and sound absorption effects. Furthermore, the present invention significantly improves the anti-mildew performance of the heavy coating material by adding a modified mildew inhibitor.

[0037] It should be noted that, in this article, terms such as "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or still includes elements inherent to such process, method, article or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight heavy coating material for automotive non-woven carpet, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of EVA resin, 18 to 22 parts of modified shell powder, 13 to 15 parts of modified mildew inhibitor, 4 to 5 parts of foaming agent, 2 to 3 parts of zinc stearate, 2 to 3 parts of cross-linking agent, and 1 to 2 parts of pore opening agent; The modified mildew inhibitor 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° C., and stir at a constant temperature until the solid component is completely dissolved to obtain a cyclodextrin solution; B2, adding iodopropynyl n-butylcarbamate to anhydrous ethanol, stirring to obtain an active component; B3. Add the active component dropwise into the cyclodextrin solution, stir for 1-2 hours, and then stand at 4°C for 24 hours. Then, vacuum filter, wash and dry to obtain a modified mildew inhibitor.

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

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

4. The lightweight heavy coating material for automotive non-woven carpet according to claim 1, characterized in that: The modified shell powder is prepared by the following steps: A1. Grind the washed and dried shells through an 80-100 mesh sieve to obtain shell powder, immerse the shell powder in a 10% sodium hydroxide aqueous solution by mass, stir ultrasonically for 1-2 hours, and then heat under reflux at 70-80°C and stir for 2-4 hours. After completion, 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°C to constant weight to obtain alkali-treated shell powder; A2. Add 3-glycidyloxypropyltrimethoxysilane to an ethanol solution with a volume fraction of 80% with stirring to obtain a modified solution, and then immerse the alkali-treated shell powder in the modified solution, stir at room temperature for 4 to 5 hours, and after stirring, dry to constant weight to obtain modified shell powder.

5. The lightweight heavy coating material for automotive non-woven carpet according to claim 4, characterized in that: The usage ratio of the ethanol solution and 3-glycidyloxypropyltrimethoxysilane in the modified solution is 100 mL:13-15 g.

6. The lightweight heavy coating material for automotive non-woven carpet according to claim 4, characterized in that: The usage ratio of the alkali-treated shell powder and the modified solution in A2 is 1g:10mL.

7. The lightweight heavy coating material for automotive non-woven carpet according to claim 1, characterized in that: The foaming agent is one of sodium α-olefin sulfonate and azodicarbonamide.

8. The lightweight heavy coating material for automotive non-woven carpet according to claim 1, characterized in that: The cross-linking agent is one of triethanolamine and benzoyl peroxide.

9. The lightweight heavy coating material for automotive non-woven carpet according to claim 1, characterized in that: The pore opening agent is one of AK-9905 and AK9902.

10. A method for preparing a lightweight heavy coating material for automotive non-woven carpet according to any one of claims 1 to 9, characterized in that: The following steps are involved: Weigh each raw material according to the above-mentioned mass proportion, then add EVA resin, modified shell powder, modified mildew inhibitor and zinc stearate into an internal mixer and plasticize for 8 to 10 minutes, then add foaming agent, cross-linking agent and pore opening agent thereto, mix for 1 to 2 hours, after mixing, place in a double-roll open mill for refining and sheeting to obtain a heavy coating material sheet, then add the heavy coating material sheet into a molding foaming machine, place at 150 to 155° C. for foaming for 4 to 5 minutes, after completion, cool to room temperature, discharge the material, and obtain a lightweight heavy coating material for automotive non-woven carpets.

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