A water-based hydrophilic functional coating, a hydrophilic flocking tape and a preparation method

Abstract

The application discloses a kind of water-based hydrophilic functional coating, hydrophilic flocking belt and preparation method, the water-based hydrophilic functional coating includes the following components: film-forming material, deionized water, defoaming agent, wetting agent and thickening agent, the film-forming material includes hydrophilic resin and amphiphilic active resin, the amphiphilic active resin contains hydrophilic and lipophilic group, for realizing directional arrangement.The water-based hydrophilic functional coating provided by the application can improve the wear resistance and the wiper cleaning performance of the flocking belt, significantly reduce the influence of the residual water stain on the line of sight after the glass is lifted, ensure that the side window glass provides a good view in rainy days or specific environments, and improve the safety performance.

Description

A water-based hydrophilic functional coating, a hydrophilic flocked tape, and a preparation method thereof. Technical Field

[0001] This invention relates to a functional coating, flocked tape, and preparation method thereof, and more particularly to a water-based hydrophilic functional coating, hydrophilic flocked tape, and preparation method thereof. Background Technology

[0002] Flocked weatherstripping for car windows is a crucial component, serving functions such as protection, wiping, and sealing. However, the flocked surface of commonly used weatherstripping has low abrasion resistance and is prone to shedding, increasing friction between the window glass and the weatherstripping and reducing its lifespan. Furthermore, after wiping water with conventional flocked weatherstripping, residual water droplets on the glass gradually shrink into small droplets, and this chaotic diffuse reflection can impair the driver's and passengers' vision, potentially leading to safety hazards.

[0003] With societal development, the quality requirements for automobiles are constantly rising. Improving the wear resistance and additional functions of flocked sealing strips has become a focus for researchers. Conventional automotive flocked sealing strips employ an online flocking process, bonding a layer of flocked tape during the extrusion of rubber or TPV sealing strips. Therefore, enhancing the wear resistance of flocked tapes for automotive applications and endowing them with new additional functions has become a research and improvement direction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a water-based hydrophilic functional coating, a hydrophilic flocked tape and a preparation method thereof. The water-based hydrophilic coating can improve the wear resistance and water-scraping cleaning performance of the flocked tape, significantly reduce the impact of residual water stains on the line of sight after the glass is raised and lowered, ensure that the side window glass provides a good view in rainy weather or specific environments, and improve safety performance.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is to provide a water-based hydrophilic functional coating, comprising the following components: film-forming substance, deionized water, defoamer, wetting agent and thickener, wherein the film-forming substance comprises hydrophilic resin and amphiphilic active resin, and the amphiphilic active resin contains hydrophilic and lipophilic groups for achieving directional alignment.

[0006] Furthermore, the components are proportioned by mass as follows:

[0007]

[0008]

[0009] Furthermore, the contact angle between the hydrophilic resin and the glass is less than or equal to 20°.

[0010] Furthermore, the thickener is a high-shear associative polyurethane thickener.

[0011] To solve the above-mentioned technical problems, the present invention also provides a method for preparing the above-mentioned waterborne hydrophilic functional coating, which includes the following steps: S1) adding hydrophilic resin, deionized water, defoamer and wetting agent into a reaction vessel and stirring; S2) adding amphiphilic active resin and continuing to disperse and stir; S3) adding thickener to control viscosity; S4) filtering and dispensing to obtain the finished coating product.

[0012] Furthermore, in step S1, the stirring speed is 700-900 rpm, and in step S3, the stirring speed is increased to 900-1200 rpm to control and adjust the viscosity.

[0013] To solve the above-mentioned technical problems, the present invention also provides a hydrophilic flocked tape, wherein the surface of the hydrophilic flocked tape is coated with the water-based hydrophilic functional coating as described above.

[0014] To solve the above-mentioned technical problems, the present invention also provides a method for preparing the above-mentioned hydrophilic flocked tape, wherein an isocyanate curing agent is added to the hydrophilic coating during coating, and the coating method is anilox roller transfer or spraying.

[0015] Furthermore, the isocyanate curing agent is added at a ratio of 3-10% by mass.

[0016] Furthermore, when using an anilox roller transfer coating, the viscosity of the hydrophilic coating at 25℃ should be controlled at 300-700 cps, and when using continuous spray coating, the viscosity of the hydrophilic coating at 25℃ should be controlled at 50-120 cps; after coating, dry at 80℃ for 3-5 minutes.

[0017] Compared with existing technologies, this invention offers the following advantages: The water-based hydrophilic functional coating, hydrophilic flocked tape, and preparation method provided by this invention are low in VOCs, safe, and environmentally friendly. They help improve the wear resistance, water absorption, and squeegee cleaning performance of the hydrophilic flocked tape, significantly reducing the impact of residual water stains on visibility after window operation, ensuring that the side windows provide passengers with good visibility in rainy weather or specific environments, thus improving safety performance. The water-based hydrophilic coating is easy to transport, store, and use. Attached Figure Description

[0018] Figure 1 is a flowchart of the preparation process of the water-based hydrophilic functional coating of the present invention;

[0019] Figure 2 is a schematic diagram of the hydrophilic flocked tape of the present invention;

[0020] Figure 3 is a schematic diagram of water droplets forming water beads on existing flocked fibers;

[0021] Figure 4 is a schematic diagram of the hydrophilic treatment of the flocked tape of the present invention absorbing water droplets. Detailed Implementation

[0022] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0023] This invention provides a water-based hydrophilic functional coating comprising the following components: a film-forming substance, deionized water, a defoamer, a wetting agent, and a thickener. The film-forming substance comprises a hydrophilic resin and an amphiphilic active resin. The amphiphilic active resin contains both hydrophilic and lipophilic groups for directional alignment. The hydrophilic resin is the main film-forming substance; too little of it will weaken the coating's durability. The amphiphilic active resin is relatively easy to transfer to the coating surface, enhancing the effectiveness of a single application of water-repellent coating. Too little will result in insufficient effect, while too much will reduce durability. Preferably, the components are proportioned as follows by weight:

[0024]

[0025] Preferably, the contact angle between the hydrophilic resin and the glass is less than or equal to 20°. If the contact angle is too large, the prepared tape will not have sufficient hydrophilicity and will not easily form a water film after wiping when used continuously with water spray.

[0026] The hydrophilic flocked tape provided by this invention has a surface coated with the aforementioned water-based hydrophilic functional coating. The coating covers the surface of the flock, with amphiphilic active substances on the coating surface and the hydrophilic ends facing outwards. To improve durability, an isocyanate curing agent is added to the hydrophilic coating during coating. The coating method is either anilox roller transfer or spraying. When using anilox roller transfer, the viscosity of the hydrophilic coating is controlled at 300-700 cps; when using continuous spraying, the viscosity is controlled at 50-120 cps. This is because the flocked tape material is polyester or nylon, and the use of isocyanate curing agents results in the best adhesion between the coating and the flock due to chemical bonding and other effects. The addition ratio can be 3-10%. Adding more than 10% will harden the finished product's feel and reduce its smoothness; adding less than 3% will reduce durability.

[0027] Please refer to Figure 1. The preparation process of the waterborne hydrophilic functional coating of the present invention is as follows:

[0028] 60 kg of hydrophilic resin, 10 kg of deionized water, 0.5 kg of defoamer, and 1 kg of wetting agent were added to the reaction vessel and stirred at 800 rpm for 20 minutes.

[0029] Then add 30 kg of amphiphilic active resin and continue dispersing for 10 min.

[0030] Next, increase the stirring speed to 1000 rpm and add 3 kg of thickener to adjust the viscosity to 450 cps.

[0031] Finally, the coating was filtered through a 200-mesh filter cloth, packaged, and the finished product weighed approximately 100 kg.

[0032] The water-based coating prepared by the above method is mixed with 1 kg of isocyanate curing agent for water-based coatings (20 kg), stirred evenly, and then coated onto a flocked tape using a knitted roller transfer method. After drying at 80℃ for 3-5 minutes, a hydrophilic flocked tape is obtained, as shown in Figure 2. The flocked tape includes a flocking adhesive layer 3 and flocking fibers 4. The flocked tape is attached to the door and window seal 1 via a TPO adhesive layer 2.

[0033] Conventional flocking tapes use polyester or polyamide as the flocking material. Water droplets on the flocking material form beads and then slowly penetrate into the gaps between the layers, as shown in Figure 3. However, the hydrophilic coating treatment provided by this invention coats the outer surface of the flocking material 4 with a water-based hydrophilic functional coating, causing water droplets to be absorbed instantly, as shown in Figure 4.

[0034] Take water-wiping devices with hydrophilic flocked tape and regular water-wiping devices, each about 10cm in length, and test their wiping performance after different number of up-and-down movements of the car window after one water spray. The wiping performance is judged according to the Q / JLY-2020 standard. Table 1 shows the wiping performance after 1, 5, and 10 up-and-down movements of the car window.

[0035]

[0036] The results showed that after conventional water-cutting and shaving, the surface of the car window was in a messy state with water accumulation in some areas; while after the water-cutting was treated with hydrophilic flocking tape, it formed a transparent water film.

[0037] Simulating the raising and lowering of a car window at a speed of 1000 mm / min, water was sprayed once every 10 raising and lowering cycles, with each spray covering the entire glass surface. The experiment compared the water-cutting effect of the hydrophilic flocked tape after 1000 cycles with the conventional water-cutting method. The water-cutting effect was still very obvious, indicating that the hydrophilic flocked tape has a significant and sustained water-cutting effect after a certain number of wear cycles.

[0038] In summary, under the cross-linking effect of the isocyanate curing agent, a three-dimensional network structure can be formed between the hydrophilic coating and the flocked tape, improving the adhesion of the hydrophilic coating and increasing its durability. Simultaneously, the addition of a hydrophilic coating to the surface of the flocked tape enhances its abrasion resistance. By improving the water absorption of the flocked tape and utilizing the slow transfer characteristics of amphiphilic substances, residual water stains on the glass surface can form a uniform water film or spread evenly on the surface, ensuring that the side window glass provides passengers with good visibility in rainy weather or specific environments, thus improving safety performance.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the claims.

Claims

1. A hydrophilic flocked tape for automotive windows, characterized in that, The surface of the hydrophilic flocked tape is coated with a water-based hydrophilic functional coating. An isocyanate curing agent is added to the water-based hydrophilic functional coating during coating. The coating method is either roller transfer or spraying. The isocyanate curing agent is added at a ratio of 3%-10% by mass. The water-based hydrophilic functional coating contains the following components: film-forming substance, deionized water, defoamer, wetting agent, and thickener. The film-forming substance includes hydrophilic resin and amphiphilic active resin. The amphiphilic active resin contains both hydrophilic and lipophilic groups for directional alignment. The mass proportions of each component are as follows: The waterborne hydrophilic functional coating comprises: 50-70% hydrophilic resin; 20-40% amphiphilic active resin; 5-15% deionized water; 1-5% thickener; 0.5-1% defoamer; and 0.5-1% wetting agent. The thickener is a high-shear associative polyurethane thickener. The preparation method of the waterborne hydrophilic functional coating includes the following steps: S1) adding the hydrophilic resin, deionized water, defoamer, and wetting agent to a reaction vessel and stirring; S2) adding the amphiphilic active resin and continuing to disperse and stir; S3) adding the thickener to control the viscosity; and S4) filtering and dispensing to obtain the finished coating product.

2. The hydrophilic flocked tape for automotive windows as described in claim 1, characterized in that, The contact angle between the hydrophilic resin and the glass is less than or equal to 20°.

3. The hydrophilic flocked tape for automotive windows as described in claim 1, characterized in that, In step S1, the stirring speed is 700-900 rpm, and in step S3, the stirring speed is increased to 900-1200 rpm to control and adjust the viscosity.

4. The hydrophilic flocked tape for automotive windows as described in claim 1, characterized in that, When using an anilox roller transfer coating, control the viscosity of the water-based hydrophilic functional coating to 300-700 cps at 25℃. When using continuous spray coating, control the viscosity of the hydrophilic coating to 50-120 cps at 25℃. After coating, dry at 80℃ for 3-5 minutes.

Images