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CN-122011917-A - Environment-friendly water-based polyurethane waterproof material for vehicle and preparation method thereof

CN122011917ACN 122011917 ACN122011917 ACN 122011917ACN-122011917-A

Abstract

The application relates to the technical field of waterproof materials, and particularly discloses an environment-friendly water-based polyurethane waterproof material for a vehicle and a preparation method thereof. The environment-friendly water-proof material for the aqueous polyurethane vehicle is prepared from the following raw materials of aqueous polyurethane dispersoid, filler, wetting agent, defoaming agent, film forming auxiliary agent and thickening agent, wherein the preparation method comprises the steps of S1, providing the aqueous polyurethane dispersoid, S2, mixing the filler and part of the aqueous polyurethane dispersoid to obtain slurry, S3, mixing the slurry and the rest of the aqueous polyurethane dispersoid, stirring to obtain mixed solution, S4, adding the film forming auxiliary agent into the mixed solution, S5, adding the thickening agent into the product obtained in S4, and S6, filtering the product obtained in S5. The environment-friendly water-based polyurethane waterproof material for the vehicle can be used for waterproof sealing treatment of parts such as an automobile chassis, a welding line of the automobile body, an interlayer of the automobile door and the like, and has the advantages of high storage stability, good construction leveling property, compact coating, no bubbles, strong adhesive force, environment friendliness and no toxicity.

Inventors

  • LU DONGXU
  • Chai Yake
  • LI YANBING
  • CHEN YILIN

Assignees

  • 郑州工业应用技术学院

Dates

Publication Date
20260512
Application Date
20260309

Claims (10)

  1. 1. The environment-friendly water-proof material for the aqueous polyurethane vehicle is characterized by comprising, by weight, 40-60 parts of aqueous polyurethane dispersion, 10-30 parts of filler, 0.5-2 parts of wetting agent, 0.1-1 part of defoamer, 2-8 parts of film-forming auxiliary agent and 0.5-3 parts of thickener.
  2. 2. The environment-friendly water-based polyurethane vehicle waterproof material according to claim 1, further comprising 0.5-2 parts of ultraviolet absorber and 0.3-1 part of antioxidant.
  3. 3. The environment-friendly water-based polyurethane vehicle waterproof material according to claim 1, wherein the filler is at least one of calcium carbonate, talcum powder and diatomite, and the wetting agent is polyether modified siloxane wetting agent.
  4. 4. The environment-friendly water-based polyurethane vehicle waterproof material according to claim 1, wherein the defoaming agent is a mineral oil defoaming agent, the film-forming auxiliary agent is an alcohol ester film-forming auxiliary agent, and the thickening agent is a polyurethane thickening agent.
  5. 5. The preparation method of the environment-friendly water-based polyurethane vehicle waterproof material is characterized by comprising the following steps of: s1, providing an aqueous polyurethane dispersion; S2, mixing the filler with part of the aqueous polyurethane dispersion, and grinding to obtain slurry; s3, mixing the slurry with the residual aqueous polyurethane dispersion, adding a wetting agent and a defoaming agent, and stirring to obtain a mixed solution; S4, adding a film forming auxiliary agent into the mixed solution, and continuously stirring; s5, adding a thickener into the product obtained in the step S4; s6, filtering the product obtained in the step S5 to obtain the environment-friendly water-based polyurethane vehicle waterproof material.
  6. 6. The method for preparing an environment-friendly water-based polyurethane vehicle waterproof material according to claim 5, wherein the method further comprises a pretreatment of drying the filler before the step S2, wherein the drying temperature is 100-120 ℃ and the time is 1-2 hours.
  7. 7. The method for preparing the environment-friendly water-based polyurethane vehicle waterproof material according to claim 5, wherein in the step S2, grinding is performed by adopting a ball mill, the grinding time is 30-60 minutes, and the fineness of slurry is controlled to be less than or equal to 50 μm.
  8. 8. The method for preparing an environment-friendly type aqueous polyurethane vehicle waterproof material according to claim 5, wherein in the step S3, the stirring speed is 300-500rpm, the time is 20-40 minutes, and the temperature of the mixed solution is controlled at 25-35 ℃.
  9. 9. The method for preparing the environment-friendly water-based polyurethane vehicle waterproof material according to claim 5, wherein in the step S4, an ultraviolet absorber and an antioxidant are further added, the adding time is 10-20 minutes after the film forming auxiliary agent is added, and the pH value of the mixed solution is controlled to be 7.5-8.5.
  10. 10. The method for preparing the environment-friendly water-based polyurethane vehicle waterproof material according to claim 5, wherein in the step S5, the thickener is added after being diluted by water in advance, the dilution ratio is that the thickener is water=1:1-1:3, the viscosity of the final product is controlled to be 2000-5000cps, and in the step S6, a 100-200 mesh screen is adopted for filtration, and the pressure is 0.1-0.3MPa.

Description

Environment-friendly water-based polyurethane waterproof material for vehicle and preparation method thereof Technical Field The application relates to the technical field of waterproof materials, in particular to an environment-friendly water-based polyurethane waterproof material for a vehicle and a preparation method thereof. Background The waterproof material is applied in the field of vehicles to penetrate through parts such as a vehicle body, a chassis, an electric system and the like, comprises scenes such as a vehicle body joint seal, a chassis anti-corrosion coating, a vehicle window and skylight sealing adhesive tape, a battery pack waterproof packaging, a wire harness interface seal and the like, and is commonly used for blocking rainwater, snow water, accumulated water on a road surface and moisture invasion. The related waterproof material adopts a single high-solid-content material, but in practical application, the construction viscosity is out of control and the filler proportion is unbalanced due to overhigh solid content, so that uneven coating spreading, bubble residue, non-compact film formation and insufficient adhesive force are caused, the waterproof sealing performance is further influenced, the corrosion of vehicle parts and the risk of electrical faults are increased, and the service life is shortened. Disclosure of Invention In order to solve the problems of uneven coating and spreading, bubble residue, non-compact film formation and insufficient adhesive force caused by adopting a single high-solid-content material as a related waterproof material, the application provides an environment-friendly water-based polyurethane waterproof material for a vehicle and a preparation method thereof. In a first aspect, the application provides an environment-friendly water-based polyurethane vehicle waterproof material, which adopts the following technical scheme: The environment-friendly water-proof material for the aqueous polyurethane vehicle is prepared from the following raw materials, by weight, 40-60 parts of aqueous polyurethane dispersoid, 10-30 parts of filler, 0.5-2 parts of wetting agent, 0.1-1 part of defoamer, 2-8 parts of film forming auxiliary agent and 0.5-3 parts of thickener. By adopting the technical scheme, the dosage of the aqueous polyurethane dispersoid is set to 40-60 parts, so that the continuous phase of the polymer is compact enough to provide high waterproof performance after film formation, and meanwhile, a blending space is reserved for the subsequent functional filler and auxiliary agent, so that the out-of-control of construction viscosity caused by overhigh solid content is avoided; the filler is used in an amount of 10-30 parts to strengthen and lower cost, while the filler is used in a small amount to reduce the flexibility and adhesion of polyurethane molecular chain, while the filler is used in a small amount to reduce the surface tension of the system, to ensure the material to spread and permeate into microscopic gaps fast when sprayed onto the surface of metal or plastic part with complex structure, to eliminate the coating defect such as shrinkage cavity, while the defoamer is introduced in a small amount of 0.1-1 part, to be used in the subsequent high-speed stirring and the shearing action of mechanical spraying during construction to destroy and inhibit the generation and stabilization of bubbles in time, to prevent the bubbles from forming water permeating channel, and then to add film forming assistant as temporary plasticizer for polyurethane emulsion particles to promote the fusion of emulsion particles to form complete compact paint film, to control the dosage range to the minimum film forming temperature of common aqueous polyurethane resin to ensure the reliability of different construction, and finally to add the thickener in an amount of 0.5-3 parts to ensure the rheological property of the final product, to give proper static viscosity to prevent the static viscosity of the final product from dropping down, to prevent the viscosity from dropping fast enough to restore the viscosity after construction, finally, the environment-friendly waterproof material for the vehicle, which is stable in storage, smooth in construction, compact in film formation and strong in adhesive force, is obtained. Preferably, the composition further comprises 0.5-2 parts of ultraviolet absorber and 0.3-1 part of antioxidant. According to the technical scheme, aiming at the situation that a vehicle is exposed to an outdoor severe environment for a long time, targeted durability enhancement is carried out, firstly, 0.5-2 parts of ultraviolet absorber is added, the ultraviolet absorber can preferentially absorb and convert high-energy ultraviolet light, so that the aging process of the material is delayed, meanwhile, 0.3-1 parts of antioxidant is added in a matched mode to block an automatic oxidative degradation chain reaction induced by heat and oxygen, under the