Environment-friendly water-based damping material for passenger car and preparation method of environment-friendly water-based damping material

Abstract

The invention relates to the technical field of passenger car damping materials, in particular to an environment-friendly water-based damping material for passenger cars, which is characterized by comprising the following raw materials in parts by weight: 30-45 parts of water-based acrylate-butadiene copolymer emulsion; 5-15 parts of a water-borne epoxy resin emulsion; 25 to 40 parts of superfine barite powder; 3-8 parts of nano calcium carbonate; 0.5-2 parts of a water-based polyamide wax rheological agent; 0.3-1 part of a modified polyether defoaming agent; 0.2 to 0.8 part of a composite preservative; 1-5 parts of a polyethylene glycol 400 plasticizer; and 5-15 parts of deionized water. Water is used as a dispersion medium, environment-friendly components are adopted, harmful solvents such as benzene, methylbenzene and xylene are not contained, meanwhile, the material does not contain harmful substances such as heavy metal and formaldehyde, the environment-friendly performance is improved, and the body health of production operators and in-vehicle personnel is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of damping materials technology for passenger vehicles, and in particular to an environmentally friendly water-based damping material for passenger vehicles and its preparation method. Background Technology

[0002] With the rapid development of the automotive industry and the increasing demands of consumers for ride comfort, damping materials, as key components for suppressing vehicle vibration and reducing interior noise, are being used more and more widely. Currently, damping materials commonly used in passenger vehicles are mainly divided into two categories: solvent-based and water-based.

[0003] Solvent-based damping materials use organic solvents as a carrier. While they possess good damping and construction properties, they contain large amounts of volatile organic compounds (VOCs). During production, construction, and use, they release harmful gases such as benzene, toluene, and xylene, posing serious health risks to operators and causing environmental pollution. With increasingly stringent global environmental regulations, such as the EU's REACH regulation and my country's "Automotive Air Pollutant Emission Standards," the application of solvent-based damping materials is facing increasing restrictions.

[0004] Waterborne damping materials, using water as the dispersion medium, have advantages such as low VOC content and good environmental performance, and are gradually becoming the development direction of damping materials. However, existing waterborne damping materials generally have some shortcomings: First, the damping performance needs to be improved, especially in low-temperature environments (-20℃ to 0℃), where the damping factor decreases significantly, making it difficult to meet the usage requirements of passenger vehicles across the entire temperature range; second, the water resistance and aging resistance are poor, and after long-term exposure to humid environments or high and low temperature cycles, the materials are prone to blistering and detachment, affecting their service life; third, some waterborne damping materials add components containing heavy metals or harmful additives in pursuit of performance, failing to achieve optimal environmental performance; and fourth, the production process is complex and the production cost is high, which is not conducive to large-scale industrial production.

[0005] In view of the shortcomings of the existing technologies, it is urgent to solve the problem of how to improve the damping performance, water resistance and aging resistance of materials while ensuring environmental protection performance. Summary of the Invention

[0006] In view of this, the purpose of this invention is to propose an environmentally friendly waterborne damping material for passenger vehicles and a preparation method thereof, so as to solve the problems of poor damping performance, environmental performance and weather resistance of existing waterborne damping materials.

[0007] To achieve the above objectives, the present invention provides an environmentally friendly water-based damping material for passenger vehicles, comprising the following raw materials in parts by weight:

[0008] 30-45 parts of waterborne acrylate-butadiene copolymer emulsion;

[0009] 5-15 parts of waterborne epoxy resin emulsion;

[0010] 25-40 parts of ultrafine barite powder;

[0011] 3-8 parts of nano-calcium carbonate;

[0012] 0.5-2 parts of water-based polyamide wax rheology modifier;

[0013] 0.3-1 part of modified polyether defoamer;

[0014] 0.2-0.8 parts of compound preservative;

[0015] 1-5 parts of polyethylene glycol 400 plasticizer;

[0016] 5-15 parts deionized water.

[0017] A further improvement is that the solid content of the aqueous acrylate-butadiene copolymer emulsion is 45-55%, the glass transition temperature is -30℃ to -15℃, and the particle size is 100-300nm.

[0018] A further improvement is that the solid content of the aqueous epoxy resin emulsion is 40-50%, and the epoxy equivalent is 180-220 g / eq.

[0019] A further improvement is that the ultrafine barite powder has a particle size of 1-5 μm, a whiteness of ≥90%, and a barium sulfate content of ≥98%.

[0020] A further improvement is that the particle size of the nano-calcium carbonate is 50-100 nm, and the activation degree is ≥95%.

[0021] This invention also provides a method for preparing an environmentally friendly water-based damping material for passenger vehicles, comprising the following steps:

[0022] S1: Pre-dispersion stage: According to the formula ratio, deionized water, waterborne polyamide wax rheology modifier, and modified polyether defoamer are added to a high-speed disperser to form a uniform pre-dispersion liquid.

[0023] S2: Filler dispersion stage: Maintain the high speed of the disperser and slowly add ultrafine barite powder and nano calcium carbonate to the pre-dispersion liquid for dispersion to form a uniform filler dispersion slurry.

[0024] S3: Emulsion mixing stage: Reduce the speed of the high-speed disperser and add water-based acrylate-butadiene copolymer emulsion and water-based epoxy resin emulsion to the filler dispersion slurry in sequence;

[0025] S4: Post-treatment stage: Add polyethylene glycol 400 plasticizer and composite preservative to the mixed system, and then filter it with a 100-200 mesh filter to obtain environmentally friendly water-based damping material.

[0026] A further improvement is that, in S1, the high-speed disperser rotates at a speed of 800-1000 r / min and the dispersion time is 5-8 min.

[0027] A further improvement is that, in S2, the high-speed disperser rotates at 1200-1500 r / min, and the material is added in 3-5 batches, with dispersion for 3-5 minutes after each addition, and dispersion continuing for 15-20 minutes after all the material has been added.

[0028] A further improvement is that, in S3, the high-speed disperser rotates at 600-800 r / min, and disperses for 5-10 min after each emulsion is added.

[0029] A further improvement is that in S4, dispersion is carried out for 8-12 minutes at a rotation speed of 500-600 r / min.

[0030] The beneficial effects of this invention are as follows: Through the synergistic effect of waterborne acrylate-butadiene copolymer emulsion and waterborne epoxy resin emulsion, combined with the filling modification of ultrafine barite powder and nano-calcium carbonate, the material exhibits excellent damping performance over a wide temperature range. Testing shows that the damping factor is ≥0.35 within the temperature range of -20℃ to 60℃, with a damping factor reaching 0.52 at 25℃, far exceeding the damping factor level of 0.3-0.4 for existing waterborne damping materials at room temperature. Even at a low temperature of -20℃, the damping factor remains at 0.38, solving the problem of poor low-temperature damping performance of existing waterborne damping materials and meeting the usage needs of passenger vehicles in all regions and seasons.

[0031] Furthermore, it uses water as the dispersion medium and employs environmentally friendly components, free from harmful solvents such as benzene, toluene, and xylene. According to testing, the VOCs content is ≤5g / L, far below the requirement of ≤80g / L specified in the national standard GB / T27930-2011. At the same time, the material does not contain heavy metals, formaldehyde, or other harmful substances, thus improving its environmental performance and effectively protecting the health of production operators and personnel inside the vehicle.

[0032] The cross-linking and curing effect of waterborne epoxy resin emulsion combined with the activity-enhancing effect of nano-calcium carbonate significantly improves the weather resistance and water resistance of the material. After aging for 1000 hours at 50℃ and 95% relative humidity, the material showed no blistering or peeling, and the damping factor retention rate was ≥90%. After immersion in room temperature water for 72 hours, the water absorption rate was ≤2.5%, which is far lower than the water absorption rate of more than 5% of existing waterborne damping materials. The service life can reach more than 8 years, meeting the long-term use requirements of passenger vehicles.

[0033] With the adjustment effect of water-based polyamide wax rheology modifier, the viscosity of the material is controlled at 15000-25000 mPa·s (25℃). It can be applied by various methods such as scraping and rolling, with uniform thickness and no sagging. The tensile strength of the material is ≥3.2MPa, the elongation at break is ≥150%, and the adhesion to the steel plate of passenger car body is ≥1.5MPa. After construction, cracking and peeling are not likely to occur.

[0034] The entire production process is carried out at normal temperature and pressure, requiring no complex equipment or special production conditions. The process steps are simple and easy to operate. All raw materials used are common materials that are readily available in the market. Compared with existing high-performance solvent-based damping materials, the production cost is reduced by 15%-20%, resulting in significant economic benefits and market competitiveness. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the process flow of an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram comparing the material properties of the product in Embodiment 1 of the present invention with those of existing products. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Example 1

[0041] This embodiment provides an environmentally friendly waterborne damping material for passenger vehicles, which is composed of the following components in parts by weight: 35 parts of waterborne acrylate-butadiene copolymer emulsion, 10 parts of waterborne epoxy resin emulsion, 32 parts of ultrafine barite powder, 5 parts of nano calcium carbonate, 1.2 parts of waterborne polyamide wax rheology modifier, 0.6 parts of modified polyether defoamer, 0.5 parts of composite preservative, 3 parts of polyethylene glycol 400 plasticizer, and 12.7 parts of deionized water.

[0042] The waterborne acrylate-butadiene copolymer emulsion has a solid content of 50%, a glass transition temperature of -25℃, and a particle size of 200nm; the waterborne epoxy resin emulsion has a solid content of 45% and an epoxy equivalent of 200g / eq; the ultrafine barite powder has a particle size of 3μm, a whiteness of 92%, and a barium sulfate content of 98.5%; the nano-calcium carbonate has a particle size of 80nm and an activation degree of 96%.

[0043] The material utilizes a water-based acrylate-butadiene copolymer emulsion to provide basic adhesion and damping properties, while the copolymer structure enhances low-temperature toughness. A water-based epoxy resin emulsion strengthens the material's water resistance, aging resistance, and mechanical strength. Ultrafine barite powder improves density and damping properties, with its fine particle size ensuring uniform dispersion. Nano-calcium carbonate works synergistically with the emulsion to enhance mechanical properties and weather resistance. A water-based polyamide wax rheology modifier adjusts the material's rheological properties, prevents sedimentation, and improves workability. A modified polyether defoamer eliminates bubbles generated during production and construction, ensuring material density. A composite preservative inhibits bacterial and fungal growth, extending shelf life; the environmentally friendly formula releases no harmful substances. Polyethylene glycol 400 plasticizer enhances flexibility and low-temperature damping properties; it is environmentally friendly and non-toxic. A deionized water dispersion medium adjusts viscosity and ensures uniform dispersion of all components.

[0044] like Figure 1 As shown in the figure, this embodiment also provides a method for preparing an environmentally friendly water-based damping material for passenger vehicles, including the following steps:

[0045] S1: Pre-dispersion: Add 12.7 parts of deionized water, 1.2 parts of waterborne polyamide wax rheology modifier, and 0.6 parts of modified polyether defoamer to a high-speed disperser and disperse at 800 r / min for 6 min to form a pre-dispersion liquid;

[0046] S2: Filler dispersion: Maintain a rotation speed of 1300 r / min, add 32 parts of ultrafine barite powder and 5 parts of nano calcium carbonate in 4 portions, disperse for 4 min after each addition, and disperse for 18 min after all additions to obtain filler dispersion slurry;

[0047] S3: Emulsion mixing: Reduce the rotation speed to 700 r / min, first add 35 parts of waterborne acrylate-butadiene copolymer emulsion, disperse for 8 min, then add 10 parts of waterborne epoxy resin emulsion, disperse for 8 min;

[0048] S4: Post-treatment: Add 3 parts of polyethylene glycol 400 plasticizer and 0.5 parts of composite preservative to the mixture, disperse at 550 r / min for 10 min, filter with a 150 mesh filter to remove impurities and incompletely dispersed particles, and obtain the product.

[0049] The performance of the product in this embodiment was tested, and the results are as follows: VOCs content 3.2 g / L; damping factor 0.52 at 25℃ and 0.39 at -20℃; damping factor retention rate 92% after aging at 50℃ and 95%RH for 1000 h; water absorption rate 2.2% after soaking in room temperature water for 72 h; tensile strength 3.5 MPa, elongation at break 160%; adhesion to steel plate 1.6 MPa.

[0050] The entire production process is carried out at normal temperature and pressure, requiring no complex equipment or special production conditions. The process steps are simple and easy to operate. All raw materials used are common materials that are readily available in the market. Compared with existing high-performance solvent-based damping materials, the production cost is reduced by 15%-20%, resulting in significant economic benefits and market competitiveness.

[0051] Example 2

[0052] This embodiment provides an environmentally friendly waterborne damping material for passenger vehicles, which is composed of the following components in parts by weight: 30 parts of waterborne acrylate-butadiene copolymer emulsion, 15 parts of waterborne epoxy resin emulsion, 40 parts of ultrafine barite powder, 3 parts of nano calcium carbonate, 0.5 parts of waterborne polyamide wax rheology modifier, 0.3 parts of modified polyether defoamer, 0.2 parts of composite preservative, 1 part of polyethylene glycol 400 plasticizer, and 10 parts of deionized water.

[0053] The waterborne acrylate-butadiene copolymer emulsion has a solid content of 45%, a glass transition temperature of -30℃, and a particle size of 100nm; the waterborne epoxy resin emulsion has a solid content of 50% and an epoxy equivalent of 180g / eq; the ultrafine barite powder has a particle size of 1μm, a whiteness of 90%, and a barium sulfate content of 98%; and the nano-calcium carbonate has a particle size of 50nm and an activation degree of 95%.

[0054] This embodiment also provides a method for preparing an environmentally friendly water-based damping material for passenger vehicles, which is the same as the method in Embodiment 1, except that the corresponding parameters are adjusted as follows: in the pre-dispersion stage, the high-speed disperser speed is 1000 r / min, and the dispersion time is 5 min; in the filling stage, the high-speed disperser speed is 1500 r / min, the material is added in 3 batches, and the dispersion time is 5 min each time, and the dispersion time is 20 min after all the materials are added; in the emulsion mixing stage, the high-speed disperser speed is 600 r / min, and the dispersion time is 10 min for each emulsion; in the post-conditioning stage, the high-speed disperser speed is 500 r / min, and the dispersion time is 12 min, and the material is filtered through a 200-mesh filter.

[0055] Performance test results: VOCs content 4.8g / L; damping factor 0.48 at 25℃ and 0.38 at -20℃; damping factor retention rate 90% after aging at 50℃ and 95%RH for 1000h; water absorption rate 2.5% after immersion in room temperature water for 72h; tensile strength 3.2MPa, elongation at break 150%; adhesion to steel plate 1.5MPa.

[0056] Example 3

[0057] This embodiment provides an environmentally friendly waterborne damping material for passenger vehicles, which is composed of the following components in parts by weight: 45 parts of waterborne acrylate-butadiene copolymer emulsion, 5 parts of waterborne epoxy resin emulsion, 25 parts of ultrafine barite powder, 8 parts of nano-calcium carbonate, 2 parts of waterborne polyamide wax rheology modifier, 1 part of modified polyether defoamer, 0.8 parts of composite preservative, 5 parts of polyethylene glycol 400 plasticizer, and 8.2 parts of deionized water.

[0058] The waterborne acrylate-butadiene copolymer emulsion has a solid content of 55%, a glass transition temperature of -25℃, and a particle size of 200nm; the waterborne epoxy resin emulsion has a solid content of 45% and an epoxy equivalent of 200g / eq; the ultrafine barite powder has a particle size of 3μm, a whiteness of 92%, and a barium sulfate content of 98.5%; the nano-calcium carbonate has a particle size of 80nm and an activation degree of 96%.

[0059] This embodiment also provides a method for preparing an environmentally friendly waterborne damping material for passenger vehicles, which is the same as the method in Embodiment 1, except that the corresponding parameters are adjusted as follows: in the pre-dispersion stage, the high-speed disperser speed is 900 r / min and the dispersion time is 8 min; in the filling stage, the high-speed disperser speed is 1200 r / min, the material is added in 5 batches, and the dispersion time is 5 min each time, and the dispersion time is 15 min after all the materials are added; in the emulsion mixing stage, the high-speed disperser speed is 800 r / min and the dispersion time is 5 min for each emulsion; in the post-conditioning stage, the high-speed disperser speed is 600 r / min and the dispersion time is 8 min, and the material is filtered through a 100-mesh filter.

[0060] Performance test results: VOCs content 2.5g / L; damping factor 0.55 at 25℃ and 0.40 at -20℃; damping factor retention rate 93% after aging at 50℃ and 95%RH for 1000h; water absorption rate 2.0% after immersion in room temperature water for 72h; tensile strength 3.8MPa, elongation at break 170%; adhesion to steel plate 1.7MPa.

[0061] Example 1 compared to existing water-based damping materials:

[0062]

[0063]

[0064] like Figure 2 As shown in the comparative test results, the environmentally friendly water-based damping material of this embodiment is significantly superior to existing water-based damping materials on the market in terms of VOCs content, damping performance, aging resistance, water resistance, mechanical properties and adhesion, and has obvious technical advantages.

[0065] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An environmentally friendly water-based damping material for a passenger car, characterized by, It is composed of raw materials in the following weight parts: Waterborne acrylic ester-butadiene copolymer emulsion 30-45 parts; Waterborne epoxy resin emulsion 5-15 parts; Superfine barite powder 25-40 parts; Nano calcium carbonate 3-8 parts; Waterborne polyamide wax rheological agent 0.5-2 parts; Modified polyether defoaming agent 0.3-1 part; Composite preservative 0.2-0.8 part; Polyethylene glycol 400 plasticizer 1-5 parts; Deionized water 5-15 parts.

2. The environmentally friendly water-based damping material for a passenger vehicle according to claim 1, characterized in that, The solid content of the waterborne acrylic ester-butadiene copolymer emulsion is 45-55%, the glass transition temperature is -30℃ to -15℃, and the particle size is 100-300nm.

3. The environmentally friendly water-based damping material for a passenger vehicle according to claim 1, characterized in that, The solid content of the waterborne epoxy resin emulsion is 40-50%, and the epoxy equivalent weight is 180-220g / eq.

4. The environmentally friendly water-based damping material for a passenger vehicle according to claim 1, wherein The particle size of the superfine barite powder is 1-5μm, the whiteness is ≥90%, and the barium sulfate content is ≥98%.

5. The environmentally friendly water-based damping material for a passenger vehicle according to claim 1, wherein The particle size of the nano calcium carbonate is 50-100nm, and the activation degree is ≥95%.

6. The method for preparing an environmentally friendly water-based damping material for a passenger vehicle according to any one of claims 1-5, characterized in that, It comprises the following steps: S1: pre-dispersion stage: according to the formula proportion, deionized water, waterborne polyamide wax rheological agent, modified polyether defoaming agent are added into a high-speed disperser to form a uniform pre-dispersion liquid; S2: filler dispersion stage: keep the speed of the high-speed disperser, slowly add superfine barite powder and nano calcium carbonate into the pre-dispersion liquid for dispersion to form a uniform filler dispersion slurry; S3: emulsion mixing stage: reduce the speed of the high-speed disperser, sequentially add waterborne acrylic ester-butadiene copolymer emulsion and waterborne epoxy resin emulsion into the filler dispersion slurry; S4: late conditioning stage: add polyethylene glycol 400 plasticizer and composite preservative into the mixed system, then filter with a 100-200 mesh filter screen to obtain an environmentally friendly waterborne damping material.

7. The method for preparing an environmentally friendly water-based damping material for passenger vehicles according to claim 6, characterized in that, In S1, the speed of the high-speed disperser is 800-1000r / min, and the dispersion time is 5-8min.

8. The method for preparing an environmentally friendly water-based damping material for passenger vehicles according to claim 6, characterized in that, In S2, the speed of the high-speed disperser is 1200-1500r / min, the material is added in 3-5 times, and each time is dispersed for 3-5min, and after all the material is added, continue to disperse for 15-20min.

9. A method for preparing an environmentally friendly water-based damping material for passenger vehicles according to claim 6, characterized in that, In S3, the speed of the high-speed disperser is 600-800r / min, and each emulsion is dispersed for 5-10min after being added.

10. A method for preparing an environmentally friendly water-based damping material for passenger vehicles according to claim 6, characterized in that, In S4, disperse for 8-12min at a speed of 500-600r / min.

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