A rubber wiper blade coating without skip and its preparation method

Abstract

The present application provides a kind of rubber wiper rubber strip coating without jumping and scraping, the coating includes: temperature-resistant resin system film-forming base 10-15 parts, solid lubricant compound system includes: graphite micro powder 2-8 parts, PTFE lubricating powder 3-8 parts, molybdenum disulfide 3-10 parts, boron nitride micro powder 3-9 parts, additive system includes: lubricant 3-8 parts, neutralizing agent 5-15 parts, dispersing agent 1-3 parts, wetting agent 0.1-0.3 parts, leveling agent 0.02-0.05 parts, defoaming agent 0.1 parts, suspending agent 0.1-0.8 parts, EBS 0.1-0.3 parts, while providing a kind of preparation method of sectional baking spray curing coating, the present formula system adapts rubber EPDM, natural rubber, neoprene etc., realize wiper rubber strip dry scraping smooth mute, full water spray no jumping, long-term rainwater scouring not to lose powder, not failure, while greatly improving the wear life of rubber strip, anti-aging, water washing performance.

Description

Technical Field

[0001] This invention belongs to the field of automotive wiper blade coating technology, specifically relating to a non-skimming rubber wiper blade coating and its preparation method. Background Technology

[0002] Currently available rubber wiper coatings generally use a single graphite or molybdenum disulfide system, which has serious technical defects: mainstream wiper blade coatings are mainly based on graphite and molybdenum disulfide. Single graphite is hydrophilic, and when exposed to a large amount of rainwater, the surface lubricating powder is easily detached, leading to a sharp increase in the wet friction coefficient. This causes the wiper blade to form a negative pressure adsorption film with the windshield, resulting in periodic stick-slipping and clicking noises. Traditional coatings generally suffer from the problem of "smooth dry wiping, but sticking when wet," which fails to meet the requirements of high-end silent wipers and stable wiping in all weather conditions. The industry has long lacked a multi-component composite lubricating coating system that is compatible with rubber substrates, provides smooth dry wiping, prevents sticking when wet, is water-resistant, and has long-lasting wear resistance.

[0003] Specifically, the shortcomings of existing coating technologies are mainly reflected in the following three dimensions: First, the coating adhesion and water resistance are insufficient. Solid lubricating powders such as graphite and molybdenum disulfide are applied to the rubber surface through physical adhesion, lacking a chemical bonding mechanism. Under high-speed scraping (vehicle speed above 40 km / h) and high-pressure water washing conditions, the surface lubricating powder is easily detached and lost, resulting in a significant reduction in the effective life of the coating. Actual test data shows that after 1000 consecutive water spraying cycles, the lubrication performance of ordinary graphite coatings decreases by more than 60%, and the wet friction coefficient soars from an initial 0.15 to over 0.45, directly causing scraping skipping.

[0004] Secondly, there is a significant disconnect between dry and wet friction performance. While a single graphite coating can achieve a low coefficient of friction in a dry state due to solid lubrication, its hydrophilic properties upon contact with water cause a negative pressure adsorption effect between the rubber strip and the glass. This results in alternating "sticky-slipping" motions at the contact surface, producing periodic vibrations and clicking noises. This inconsistency in dry and wet performance causes traditional wipers to experience a sharp decline in performance under high-frequency water usage scenarios such as heavy rain and continuous rainfall, making it unable to meet the demand for stable wiping in all weather conditions.

[0005] Third, the coatings have poor compatibility with rubber substrates. Existing coatings are mostly developed for specific rubber formulations, exhibiting limited compatibility with different substrates such as EPDM rubber, natural rubber, and neoprene rubber. Some coatings are prone to cracking and peeling under low-temperature (-40℃) or high-temperature (90℃) conditions, leading to coating failure. Furthermore, traditional coating processes often require modifications to dedicated production lines, resulting in high mass production costs, difficulty in widespread adoption, and challenges in cost control during large-scale production. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a non-skipping rubber wiper blade coating and its preparation method, achieving smooth and quiet dry wiping, no skipping under full water spray, no powdering or failure even after long-term rain washing, while significantly improving the wear resistance, aging resistance, and water resistance of the wiper blade. This formulation system is compatible with rubber (EPDM, natural rubber, neoprene, etc.) wiper blade substrates, the process is simple, suitable for mass production, requires no machine modification, and is suitable for large-scale industrial production.

[0007] One aspect of the present invention provides a non-skipping rubber wiper blade coating, the coating being prepared from the following raw materials in parts by weight: 10-15 parts of a heat-resistant resin film-forming base material; a solid lubricant compound system comprising: 2-8 parts of graphite powder, 3-8 parts of PTFE lubricating powder, 3-10 parts of molybdenum disulfide, 3-9 parts of boron nitride powder; and an additive system comprising: 3-8 parts of lubricant, 5-15 parts of neutralizer, 1-3 parts of dispersant, 0.1-0.3 parts of wetting agent, 0.02-0.05 parts of leveling agent, 0.1 parts of defoamer, 0.1-0.8 parts of suspending agent, and 0.1-0.3 parts of EBS.

[0008] In one embodiment, the coating further includes 30 to 50 parts of water as a solvent.

[0009] In one embodiment, the film-forming base material of the heat-resistant resin system includes organosilicon resin or fluorine-modified silicone resin.

[0010] In one embodiment, the lubricant is polydimethylsiloxane, the neutralizing agent is dimethylethanolamine, the wetting agent is polyether-modified silicone oil, the leveling agent is polyether-modified organosilicon leveling agent, and the suspending agent is fumed silica.

[0011] In one embodiment, the dispersant is a BYK-2012 or 2513 type polymeric dispersant, and the defoamer is a water-based silicone defoamer BYK-012 or a silicone defoamer Dow Corning DC-62.

[0012] Another aspect of the present invention provides a method for preparing a non-skimming rubber wiper strip coating, comprising the following steps: (1) Coating compounding: Dispersant, solid lubricant compounding system, neutralizer, heat-resistant resin film-forming base and other additives are added to solvent water in proportion; (2) Spray curing: The coating compounded in step (1) is evenly sprayed onto the surface of the rubber wiper strip. A segmented baking process is adopted: pre-baking at 80°C for 1 to 3 minutes, high-temperature curing at 80 to 120°C for 7 minutes, or baking at 80°C for 10 minutes, and the finished product is obtained after cooling.

[0013] In one embodiment, the coating compounded in step (1) further includes grinding, filtering and then packaging.

[0014] In one embodiment, the storage conditions for the compounded paint in step (1) after being packaged into barrels are: 5-25°C and relative humidity 30%-50%.

[0015] Compared with the prior art, the beneficial effects of this invention are as follows: (1) Fluorine-modified silicone resin or organosilicon resin is used as the matrix to improve heat resistance. The four solid lubricants form a synergistic effect. Graphite provides basic lubrication, PTFE reduces the coefficient of friction, molybdenum disulfide enhances high-pressure lubrication, and boron nitride improves temperature resistance. The four solid lubricants are compounded to form a multi-layer lubrication network. The coefficient of friction can be reduced to below 0.1, which is suitable for working conditions that reduce wear.

[0016] (2) The coating is sprayed and cured using a segmented baking process: pre-baking at 80℃ for 1-3 minutes, mainly using fluorinated modified silicone resin or organosilicon resin as the inherent pores and microcracks of the matrix to store four solid lubricants, so that the coating does not powder or fail when washed by rain; high-temperature curing at 80-120℃ for 7 minutes, or baking at 80℃ for 10 minutes, further destroys the microcrystalline region of fluorinated modified silicone resin or organosilicon resin to restore the rubber to a suitable processing state, so that the four solid lubricants are uniformly filled in the inherent pores and microcracks of the resin. At this time, the additive system cross-links and cures, realizing the coating curing into a film, achieving smooth and quiet dry scraping, and no jumping when sprayed with full water. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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

[0018] This invention provides a non-skipping rubber wiper blade coating, which is made from the following raw materials in parts by weight: 10 parts of a heat-resistant resin system film-forming base material, silicone resin or fluorine-modified silicone resin; a solid lubricant compound system including: 5 parts of graphite powder, 5 parts of PTFE lubricating powder, 6 parts of molybdenum disulfide, 6 parts of boron nitride powder; an additive system including: lubricant, 6 parts of polydimethylsiloxane; neutralizer, 8 parts of dimethylethanolamine; dispersant, BYK-2012 or 2513, 1 part; wetting agent, 0.1 parts of polyether-modified silicone oil; leveling agent, 0.02 parts of polyether-modified silicone; defoamer, water-based silicone defoamer BYK-012 or silicone defoamer Dow Corning DC-62, 0.1 parts; suspending agent, 0.2 parts of fumed silica, 0.1 parts of EBS; and the remainder being a water solvent. Example

[0019] This invention provides a non-skipping rubber wiper blade coating, which is made from the following raw materials in parts by weight: 15 parts of a heat-resistant resin system film-forming base material, silicone resin or fluorine-modified silicone resin; a solid lubricant compound system including: 8 parts of graphite powder, 8 parts of PTFE lubricating powder, 10 parts of molybdenum disulfide, and 9 parts of boron nitride powder; an additive system including: 8 parts of lubricant, polydimethylsiloxane; 15 parts of neutralizer, dimethylethanolamine; 3 parts of dispersant, BYK-2012 or 2513; 0.3 parts of wetting agent, polyether-modified silicone oil; 0.05 parts of leveling agent, polyether-modified silicone; 0.1 parts of defoamer, water-based silicone defoamer BYK-012 or silicone defoamer Dow Corning DC-62; 0.8 parts of suspending agent, fumed silica; 0.3 parts of EBS; and the remainder being a water solvent.

[0020] For Examples 1 and 2, the present invention provides a method for preparing a non-skimming rubber wiper strip coating, comprising the following steps: (1) Coating compounding: Dispersant, solid lubricant compounding system, neutralizer, heat-resistant resin film-forming base and other additives are added to solvent water in proportion; (2) Spray curing: The coating compounded in step (1) is evenly sprayed onto the surface of the EPDM rubber wiper strip. A segmented baking process is adopted: pre-baking at 80°C for 1 to 3 minutes, high-temperature curing at 80 to 120°C for 7 minutes, or baking at 80°C for 10 minutes, and the finished product is obtained after cooling.

[0021] The coating compounded in step (1) also includes grinding, filtering and packaging. The storage conditions of the coating compounded in step (1) after packaging are: 5-25℃ and relative humidity 30%-50%.

[0022] Example 1 or 2 is the experimental group, which uses a segmented baking process.

[0023] control group Coating type: Existing single graphite coating is selected; Substrate: EPDM rubber wiper strip is selected as in Examples 1 and 2; Coating curing process: Single curing (120℃ / 10min).

[0024] Adhesion and washability verification:

[0025] In Examples 1 and 2, the segmented baking process allows the solid lubricant to fill the inherent pores and microcracks of the resin, resulting in significantly better performance retention after rinsing compared to the control group. Separate verification of dry and wet friction performance:

[0026] Due to the hydrophobic properties of fluorinated modified silicone resin / organic silicone resin, the water film in the experimental group could not form a negative pressure adsorption effect, resulting in a significant improvement in the consistency of dry and wet friction performance.

[0027] Under the same test conditions, the experimental group showed performance degradation of <30%, dry and wet friction coefficient difference of <0.10, and cracking / peeling rate of <20%. The experimental group was able to destroy the resin microcrystalline region and restore the rubber to a suitable processing state due to the segmented baking process. The coating had a higher thermal expansion coefficient matching degree with different substrates and was less prone to cracking and peeling under extreme temperatures. Solid lubricant filled the resin pores.

Claims

1. A non-skimming rubber wiper blade coating, characterized in that, The coating is made from the following raw materials in parts by weight: 10-15 parts of heat-resistant resin film-forming base material, and a solid lubricant compound system including: 2-8 parts of graphite powder, 3-8 parts of PTFE lubricating powder, 3-10 parts of molybdenum disulfide, 3-9 parts of boron nitride powder, and an additive system including: 3-8 parts of lubricant, 5-15 parts of neutralizer, 1-3 parts of dispersant, 0.1-0.3 parts of wetting agent, 0.02-0.05 parts of leveling agent, 0.1 parts of defoamer, 0.1-0.8 parts of suspending agent, and 0.1-0.3 parts of EBS.

2. The non-skipping rubber wiper strip coating according to claim 1, characterized in that, The coating also includes 30 to 50 parts of water as a solvent.

3. The non-skipping rubber wiper strip coating according to claim 1, characterized in that, The film-forming base material of the heat-resistant resin system includes organosilicon resin or fluorine-modified silicone resin.

4. The non-skipping rubber wiper strip coating according to claim 1, characterized in that, The lubricant is polydimethylsiloxane, the neutralizing agent is dimethylethanolamine, the wetting agent is polyether-modified silicone oil, the leveling agent is polyether-modified organosilicon leveling agent, and the suspending agent is fumed silica.

5. The non-skipping rubber wiper strip coating according to claim 1, characterized in that, The dispersant is a high molecular weight dispersant of type BYK-2012 or 2513, and the defoamer is a water-based silicone defoamer BYK-012 or a silicone defoamer Dow Corning DC-62.

6. A method for preparing a non-skimming rubber wiper strip coating, characterized in that, Includes the following steps: (1) Coating compounding: Dispersant, solid lubricant compounding system, neutralizer, heat-resistant resin film-forming base and other additives are added to solvent water in proportion; (2) Spray curing: The coating compounded in step (1) is evenly sprayed onto the surface of the rubber wiper strip. A segmented baking process is adopted: pre-baking at 80°C for 1 to 3 minutes, high-temperature curing at 80 to 120°C for 7 minutes, or baking at 80°C for 10 minutes, and the finished product is obtained after cooling.

7. The method for preparing a non-skimming rubber wiper strip coating according to claim 6, characterized in that, The coating compounded in step (1) also includes grinding, filtering and packaging.

8. The method for preparing a non-skimming rubber wiper strip coating according to claim 7, characterized in that, The storage conditions for the compounded paint after being packaged in step (1) are: 5-25℃ and relative humidity 30%-50%.

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