Stone chip resistant coating for automobile chassis and preparation method of stone chip resistant coating

Abstract

The invention discloses a stone chip resistant coating for an automobile chassis and a preparation method of the stone chip resistant coating, and relates to the technical field of industrial coatings. The coating comprises water, water-based styrene-butadiene latex, an SBS elastomer, a coalescing agent, a dispersing agent, a defoaming agent, a pigment filler, a flash-rust-resistant auxiliary agent, a thickening agent and the like. The preparation method mainly comprises the following steps: uniformly mixing a part of water-based styrene-butadiene emulsion with a part of auxiliaries and water, dispersing with the filler by high-speed sanding, dispersing with the remaining styrene-butadiene emulsion, the SBS elastomer and other auxiliaries at medium speed, uniformly stirring, and filtering to obtain the SBS elastomer reinforced and toughened styrene-butadiene latex type stone chip resistant coating for the automobile chassis. Compared with asphalt type, PVC (polyvinyl chloride) paste type stone-impact-resistant coatings and polyurethane type stone-impact-resistant coatings in the prior art, the butylbenzene type stone-impact-resistant coating has higher paint film strength, better elasticity and better adhesive force, has good stone-impact-resistant, noise-reducing and other effects, can be directly sprayed or brushed on the surface of a cleaned automobile chassis, saves the technological process and improves the efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial coatings, and particularly relates to a stone impact resistant coating for automobile chassis and a preparation method thereof. Background Art

[0002] The automobile chassis is composed of four parts: a powertrain, a running gear, a steering system, and a braking system. The function of the chassis is to support and install the automobile engine and its various components, form the overall shape of the automobile, and receive the power of the engine to enable the automobile to move. Nowadays, with the high-speed development of transportation, the speed of automobiles has been greatly increased, resulting in an increasing impact force of road sand and gravel on the automobile chassis, wheel arches, and the lower part of the body, making the coating vulnerable to damage and losing its corrosion resistance. This directly affects the usability and ride comfort of passenger cars.

[0003] In order to achieve a good protection effect for the automobile chassis during its later daily use, it is necessary to apply a stone impact resistant coating on the surface of the automobile chassis. Currently, the stone impact resistant coatings applied on the surface of the automobile chassis are usually two types: PVC paste type stone impact resistant coatings and polyurethane foam type stone impact resistant coatings. However, in the prior art, the production process is relatively cumbersome, affecting the construction efficiency. After spraying, it needs to be baked at a high temperature of 140°C to 160°C, which consumes a lot of energy, and it is easy to cause uneven heating and local peeling during the high-temperature baking process.

[0004] Therefore, it is necessary to design an aqueous stone impact resistant coating for automobile chassis that saves the process flow, reduces energy costs, improves efficiency, and enhances performance to solve the current technical problems. Summary of the Invention

[0005] To solve the defects and deficiencies of the prior art; the purpose of the present invention is to provide a stone impact resistant coating for automobile chassis and a preparation method thereof.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: characterized in that: it comprises the following raw materials in parts by mass:

[0007] Tap water 2 - 5 parts

[0008] Aqueous styrene-butadiene latex 40 - 50 parts

[0009] SBS elastomer 10 - 15 parts

[0010] Pigment and filler 25 - 35 parts

[0011] Auxiliary agent 3 - 7 parts

[0012] Preferably, the aqueous styrene-butadiene latex is one or more of Synthomer 5521 and Trinseo 398, mixed in proportion.

[0013] Preferably, the SBS elastomer is one or more components of LG Chem 501S, Baling Petrochemical 1201, and Changhong Hi-Tech 4412, mixed in proportion.

[0014] Preferably, the pigment and filler include one or more components of talc powder, barium sulfate, heavy calcium carbonate, and black paste, mixed in proportion.

[0015] Preferably, the additives include one or more components of film-forming aids, dispersants, defoamers, anti-flash rust aids, and thickeners, mixed in proportion.

[0016] Preferably, the dispersant is one or more components of Degussa TEGO 740W and Dow Corning 1124, mixed in proportion.

[0017] Preferably, the defoamer is one or more components of Degussa TEGO 54W and Dow Corning 8590, mixed in proportion.

[0018] Preferably, the thickener is one or more components of non-ionic associative polyurethane thickener 105A and Degussa A200, mixed in proportion.

[0019] A preparation method of a stone impact resistant coating for an automotive chassis, characterized by comprising the following steps:

[0020] One: At normal temperature and pressure, part of the aqueous styrene-butadiene emulsion is stirred and mixed evenly with film-forming aids, dispersants, defoamers, and a part of water at a low speed, then talc powder, barium sulfate, and heavy calcium carbonate are added, the rotation speed of the high-speed disperser is adjusted to 2700 - 3300 r / min, stirred and mixed evenly at a high speed, and ground to a fineness of less than 40 microns to obtain a slurry.

[0021] Two: The slurry, the remaining aqueous styrene-butadiene emulsion, defoamers, anti-flash rust aids, and colored black paste are stirred and mixed evenly at a medium speed, then the SBS elastomer is added and dispersed evenly, and finally the thickener is added to adjust the viscosity to about 100 KU, and the styrene-butadiene type stone impact resistant coating for the automotive chassis can be obtained.

[0022] Three: The obtained SBS elastomer reinforced and toughened styrene-butadiene latex type stone impact resistant coating for the automotive chassis is subjected to effective filtration treatment.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] One: After the styrene-butadiene type stone impact resistant coating in the present invention is completely dried, the paint film has high strength, good elasticity, good adhesion to the steel surface, good stone impact resistance effect, simple construction method and process, is convenient for construction, can be directly sprayed or brushed on the steel surface after cleaning, saves the process flow, and improves the efficiency.

[0025] Second: The water-based styrene-butadiene emulsion is selected in the present invention, achieving the effects of green environmental protection and extremely low VOC content. Moreover, it does not require high-temperature baking, and natural drying or low-temperature (50°C - 80°C) baking can complete the drying of the coating, saving energy and avoiding the phenomenon of local peeling caused by uneven heating.

[0026] Third: The SBS elastomer-reinforced and toughened styrene-butadiene latex anti-chip coating for automotive chassis obtained in the present invention has excellent adhesion on various automotive chassis materials (aluminum, steel, plastic parts), while the two common PVC paste anti-chip coatings and polyurethane foam anti-chip coatings currently have poor substrate versatility.

[0027] Fourth: The preparation process of the present invention is simple, easy to operate, has high production efficiency and low cost, is easy to realize industrial production, and has good economic benefits, ecological efficiency and social benefits. Specific Embodiments

[0028] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described below through specific embodiments. However, it should be understood that these descriptions are only exemplary and do not limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0029] Example 1:

[0030] An anti-chip coating for automotive chassis has the following composition as shown in the table below:

[0031] Table 1 Anti-chip Coating for Automotive Chassis

[0032]

[0033]

[0034] The preparation method of the above styrene-butadiene anti-chip coating for automotive chassis includes the following steps:

[0035] 1) Add part of the water-based styrene-butadiene emulsion, film-forming aid, dispersant, defoamer and part of the water to a high-speed disperser, stir and mix evenly at a speed of 400 r / min, then add talc powder, barium sulfate, and heavy calcium carbonate, adjust the speed of the high-speed disperser to 2700 - 3300 r / min, stir at high speed for 30 min, and grind to a fineness of less than 40 μm to obtain a slurry.

[0036] 2) Add the remaining aqueous styrene-butadiene emulsion to a high-speed disperser and mix it evenly with the slurry. Then add an antifoaming agent, an anti-flash rust additive, and a colored black paste. Adjust the speed of the disperser to 750 - 1000 r / min. Then add the SBS elastomer and disperse it evenly. Finally, add the 105A thickener to adjust the viscosity to about 100 KU, and the styrene-butadiene type stone chip resistant coating for automotive chassis can be obtained. Conduct effective filtration treatment on the obtained styrene-butadiene type stone chip resistant coating.

[0037] Example 2:

[0038] A stone chip resistant coating for automotive chassis has the following composition as shown in the table below:

[0039] Table 2 Stone chip resistant coating for automotive chassis

[0040]

[0041]

[0042] The preparation method of the above-mentioned styrene-butadiene type stone chip resistant coating for automotive chassis includes the following steps:

[0043] 1) Add part of the aqueous styrene-butadiene emulsion, film-forming aid, dispersant, antifoaming agent, and part of the water to a high-speed disperser, stir and mix evenly at a speed of 400 r / min. Then add talc powder, barium sulfate, and heavy calcium carbonate. Adjust the speed of the high-speed disperser to 2700 - 3300 r / min, stir at high speed for 30 min, and grind to a fineness of less than 40 μm to obtain a slurry.

[0044] 2) Add the remaining aqueous styrene-butadiene emulsion to a high-speed disperser and mix it evenly with the slurry. Then add an antifoaming agent, an anti-flash rust additive, and a colored black paste. Adjust the speed of the disperser to 750 - 1000 r / min. Then add the SBS elastomer and disperse it evenly. Finally, add the 105A thickener to adjust the viscosity to about 100 KU, and the styrene-butadiene type stone chip resistant coating for automotive chassis can be obtained. Conduct effective filtration treatment on the obtained styrene-butadiene type stone chip resistant coating.

[0045] Compared with Example 1, the difference in Example 2 is that the grade of the styrene-butadiene latex is changed.

[0046] Example 3:

[0047] A stone chip resistant coating for automotive chassis has the following composition as shown in the table below:

[0048] Table 3 Stone chip resistant coating for automotive chassis

[0049]

[0050]

[0051] The preparation method of the styrene-butadiene type stone impact resistant coating for the above-mentioned automobile chassis comprises the following steps:

[0052] 1) Add part of the aqueous styrene-butadiene emulsion, film-forming aid, dispersant, defoamer and part of water into a high-speed disperser, stir and mix evenly at a rotation speed of 400 r / min, then add talc powder, barium sulfate and heavy calcium carbonate, adjust the rotation speed of the high-speed disperser to 2700 - 3300 r / min, stir at high speed for 30 min, and grind to a fineness less than 40 μm to obtain a slurry.

[0053] 2) Add the remaining aqueous styrene-butadiene emulsion into the high-speed disperser and mix evenly with the slurry, then add defoamer, anti-flash rust aid and colored black paste, adjust the rotation speed of the disperser to 750 - 1000 r / min, then add SBS elastomer and disperse evenly, and finally add 105A thickener to adjust the viscosity to about 100 KU, thus obtaining the styrene-butadiene type stone impact resistant coating for the automobile chassis. Conduct effective filtration treatment on the obtained styrene-butadiene type stone impact resistant coating.

[0054] Compared with Example 1, the difference in Example 3 is that the dosage of the toughening modifier SBS is halved, and the reduced dosage is replaced by styrene-butadiene latex.

[0055] Example 4:

[0056] A stone impact resistant coating for an automobile chassis, the composition of which is shown in the following table:

[0057] Table 4 Stone impact resistant coating for automobile chassis

[0058] Category Model Dosage Water-based styrene-butadiene latex 5521 56％ SBS elastomer 501S 0％ Film-forming aid Texnol 2％ Dispersant 740W 0.3％ Defoamer 8590 0.2％ Anti-flash rust additive AB RUST CH4 0.3％ Filler Talc powder 11％ Filler Barium sulfate 13％ Filler Heavy calcium carbonate 10％ Pigment Black paste 4％ Thickener 105A 0.2％ Water Tap water 2.6％

[0059] The preparation method of the styrene-butadiene type stone impact resistant coating for the above-mentioned automobile chassis comprises the following steps:

[0060] 1) Add part of the aqueous styrene-butadiene emulsion, film-forming aid, dispersant, defoamer and part of water into a high-speed disperser, stir and mix evenly at a rotation speed of 400 r / min, then add talc powder, barium sulfate and heavy calcium carbonate, adjust the rotation speed of the high-speed disperser to 2700 - 3300 r / min, stir at high speed for 30 min, and grind to a fineness less than 40 μm to obtain a slurry.

[0061] 2) Add the remaining aqueous styrene-butadiene emulsion into the high-speed disperser and mix evenly with the slurry, then add defoamer, anti-flash rust aid and colored black paste, adjust the rotation speed of the disperser to 750 - 1000 r / min, and finally add 105A thickener to adjust the viscosity to about 100 KU, thus obtaining the styrene-butadiene type stone impact resistant coating for the automobile chassis.

[0062] Conduct effective filtration treatment on the obtained styrene-butadiene type stone impact resistant coating.

[0063] Compared with Example 1, the difference in Example 4 is that the amount of the toughening modifier SBS is reduced to zero, and the reduced amount is replaced by styrene-butadiene latex.

[0064] Performance test:

[0065] Perform performance tests on Examples 1-4 and compare them with the anti-chip coatings for automotive chassis currently in use on the market. The test results are as follows in the table:

[0066] Table 5 Comprehensive performance determination of SBS elastomer-reinforced and toughened styrene-butadiene latex-based anti-chip coatings for automotive chassis

[0067]

[0068]

[0069] As can be seen from Table 5, comparing Examples 1-4, the construction method of the SBS elastomer-reinforced and toughened styrene-butadiene latex-based anti-chip coating for automotive chassis in the present invention is simple and convenient for construction. The coating can be dried either by natural drying or by baking at a low temperature (50°C - 80°C), with low energy consumption. After the coating is completely dried, the film has high strength, good elasticity and low-temperature flexibility, good adhesion to various substrates such as the steel surface, is water and salt spray resistant, and has good anti-chip impact resistance, noise reduction and other effects.

[0070] In order to avoid obscuring the concept of the present invention, some details well known in the art are not described. However, although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-chip coating for an automotive chassis, characterized in that: It comprises raw materials in the following parts by mass: Tap water: 2 - 5 parts Water-based styrene-butadiene latex: 40 - 50 parts SBS elastomer: 10 - 15 parts Pigment and filler: 25 - 35 parts Auxiliary agent: 3 - 7 parts.

2. The anti-chip coating for an automotive chassis according to claim 1, characterized in that: The water-based styrene-butadiene latex is one or more components of Sintomer 5521 and Trinseo 398, mixed in proportion.

3. The anti-chip coating for an automotive chassis according to claim 1, wherein: The SBS elastomer is one or more components of LG Chem 501S, Yueyang Petrochemical 1201, and Changhong Hi-Tech 4412, mixed in proportion.

4. The anti-chip coating for an automotive chassis according to claim 1, wherein: The pigment and filler include one or more components of talc powder, barium sulfate, heavy calcium carbonate, and black paste, mixed in proportion.

5. An anti-chip coating for an automobile chassis according to claim 1, characterized in that: The auxiliary agent includes one or more components of film-forming auxiliary agent, dispersant, defoamer, anti-flash rust agent, and thickener, mixed in proportion.

6. The anti-chip coating for an automotive chassis according to claim 1, characterized in that: The dispersant is one or more components of Degussa TEGO 740W and Dow 1124, mixed in proportion.

7. An anti-chip coating for an automotive chassis according to claim 1, characterized in that: The defoamer is one or more components of Degussa TEGO 54W and Dow Corning 8590, mixed in proportion.

8. The anti-chip coating for an automotive chassis according to claim 1, wherein: The thickener is one or more components of non-ionic associative polyurethane thickener 105A and Degussa A200, mixed in proportion.

9. The preparation method of a stone impact resistant coating for an automotive chassis according to claim 1, characterized in that: It includes the following steps: Step 1: At normal temperature and pressure, mix part of the water-based styrene-butadiene emulsion with film-forming auxiliary agent, dispersant, defoamer, and part of water evenly by stirring at low speed, then add talc powder, barium sulfate, and heavy calcium carbonate. Adjust the rotation speed of the high-speed disperser to 2700 - 3300 r / min, stir and mix evenly at high speed, and grind to a fineness less than 40 microns to obtain a slurry. Step 2: Mix the slurry, the remaining water-based styrene-butadiene emulsion, defoamer, anti-flash rust agent, and colored black paste evenly by stirring at medium-low speed, then add the SBS elastomer and disperse evenly. Finally, add the thickener to adjust the viscosity to about 100 KU to obtain the styrene-butadiene type stone impact resistant coating for automotive chassis. Step 3: Conduct effective filtration treatment on the obtained styrene-butadiene elastomer reinforced and toughened styrene-butadiene latex type stone impact resistant coating for automotive chassis.

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