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CN-119614052-B - Polyurea elastic finish paint and preparation method and application thereof

CN119614052BCN 119614052 BCN119614052 BCN 119614052BCN-119614052-B

Abstract

The invention belongs to the technical field of elastic finishing paint, and particularly relates to polyurea elastic finishing paint, and a preparation method and application thereof. The polyurea elastic finish paint disclosed by the invention is prepared by combining wear-resistant filler, reinforcing filler, wetting dispersant, leveling agent, ultraviolet absorbent, light stabilizer, flatting agent and diluent, and has the advantages of good stone impact fragmentation resistance, good elasticity, strong stress release capability, high elongation, shock resistance, wear resistance, water resistance, moisture resistance, acid and alkali resistance, salt fog resistance, good weather resistance and the like.

Inventors

  • ZOU QIQIANG
  • ZHANG DAN
  • JIAO ZHIFENG

Assignees

  • 株洲市九华新材料涂装实业有限公司

Dates

Publication Date
20260505
Application Date
20241204

Claims (8)

  1. 1. A polyurea elastic finish paint is characterized in that the raw materials comprise paint and curing agent; the paint comprises the following components in parts by weight: 35-40 parts of polyurea resin, 10-15 parts of hyperbranched hydroxyl polyester resin, 3-5 parts of organic silicon resin, 5-7.5 parts of wear-resistant filler, 5-8 parts of reinforcing filler and 14.5-40.2 parts of auxiliary agent; the curing agent comprises 75-85 parts by weight of aliphatic isocyanate prepolymer and 15-25 parts by weight of dimethylbenzene; the polyurea resin is asparagus polyurea resin; the thickness of the polyurea elastic finish paint is 100-130 mu m; The hyperbranched hydroxyl polyester resin is HPE 1170B produced by Basff company; the wear-resistant filler is more than one of nano silicon carbide and nanocrystalline carbon powder; The reinforcing filler is one or more of carbon black, nano silicon dioxide, calcium carbonate, ceramic fiber and carbon fiber; The auxiliary agent comprises, by weight, 1-2 parts of wetting dispersant, 0.2-0.5 part of leveling agent, 0.8-1.2 parts of ultraviolet absorber, 1-1.5 parts of light stabilizer, 1.5-3 parts of flatting agent, 13-17 parts of pigment and 10-15 parts of diluent; the diluent is a mixture of PMA and DBE, and the mass ratio of the PMA to the DBE is 1-1.2:1.
  2. 2. A method for preparing the polyurea elastomeric topcoat as defined in claim 1, comprising the steps of: spraying and then curing the spray paint containing the paint and the curing agent to obtain the polyurea elastic finish; the mass ratio of the paint to the curing agent is 100 (75-100).
  3. 3. The method for preparing the polyurea elastic finish according to claim 2, wherein the viscosity of the spray coating is 40 s-60 s.
  4. 4. The method for preparing the polyurea elastic finish according to claim 3, wherein in the spraying step, the spraying pressure is 0.4-0.6 MPa, the spraying width is 10-12 cm, the spraying distance is 15-30 cm, the overlapping range is 1/2-1/3, the spraying angle is 90 DEG + -1 DEG, and the nozzle diameter is 0.6-1.0 mm.
  5. 5. The method for preparing a polyurea elastic finish according to any one of claims 2 to 4, wherein the step of preparing the paint comprises: Grinding and filtering a mixture containing resin slurry, the wear-resistant filler and the reinforcing filler to obtain the paint; Wherein the resin slurry comprises polyurea resin, hyperbranched hydroxyl polyester resin, organic silicon resin and auxiliary agent; In the grinding step, the average particle size of the mixture after grinding is less than 30 mu m.
  6. 6. The method for producing a polyurea elastomer according to claim 5, wherein in the step of producing the paint, the mixture is ground to an average particle size of 20 μm to 30 μm in the grinding step.
  7. 7. The method of preparing a polyurea elastomeric topcoat as recited in claim 6, wherein the step of preparing the resin slurry comprises: Mixing the polyurea resin, the hyperbranched hydroxyl polyester resin, the organic silicon resin and the auxiliary agent to obtain pre-dispersed slurry; grinding the pre-dispersed slurry to the average particle size of below 10 mu m, and filtering to obtain the resin slurry.
  8. 8. Use of the polyurea elastomeric finish of claim 1 on rail transit axles.

Description

Polyurea elastic finish paint and preparation method and application thereof Technical Field The invention belongs to the technical field of elastic finishing paint, and particularly relates to polyurea elastic finishing paint, and a preparation method and application thereof. Background The elastic finishing paint is one kind of elastic paint, which is prepared with synthetic resin emulsion as base material, pigment, stuffing and assistant. The elasticity is mainly derived from the special resin emulsion and an auxiliary agent system, so that the coating can be deformed to a certain extent without breaking when being subjected to external force. The high elasticity, the waterproof property, the weather resistance and the like of the composite material are widely applied to the fields of building outer walls, wind power blade surfaces, rail transit axles and the like. The components of the existing paint applied to the rail transit axles are an epoxy primer and acrylic polyurethane finish paint system, and the system has low elastic performance, poor stress release performance under the condition of high-frequency vibration, and has the quality problems of coating cracking, paint dropping and the like after a period of operation, and the service life is short. In addition, the spraying of the coating again increases the construction cost due to strict requirements on the spraying construction site. Disclosure of Invention The invention provides polyurea elastic finish paint, a preparation method and application thereof, and aims to solve at least one aspect of the technical problems. The invention is realized by the following technical scheme: In a first aspect, the present invention provides a polyurea elastomeric topcoat, the raw materials comprising a paint and a curing agent; the paint comprises the following components in parts by weight: the curing agent comprises 75-85 parts of aliphatic isocyanate prepolymer by weight. In some possible implementations, the polyurea resin is an aspen polyurea resin. In some possible implementations, the wear-resistant filler is more than one of nano silicon carbide and nano crystalline carbon powder. In some possible implementations, the reinforcing filler is one or more of carbon black, nano silica, calcium carbonate, ceramic fiber, and carbon fiber. In some possible implementations, the auxiliary comprises the following components in parts by weight: 1 to 2 parts of wetting dispersant, 0.2 to 0.5 part of flatting agent, 0.8 to 1.2 parts of ultraviolet absorber, 1 to 1.5 parts of light stabilizer, 0 to 3 parts of flatting agent, 0 to 17 parts of pigment and 10 to 15 parts of diluent. In some possible implementations, the curing agent further includes 15-25 parts by weight of xylene. In some possible implementations, the pigment is 13-17 parts by weight. In some possible implementations, the diluent is a mixture of PMA and DBE. In a second aspect, the present invention provides a method for preparing the polyurea elastic topcoat according to the first aspect of the present invention, including the following steps: spraying and then curing the spray paint containing the paint and the curing agent to obtain the polyurea elastic finish; the mass ratio of the paint to the curing agent is 100 (75-100). In some possible implementations, the spray coating has a viscosity of 40s-60s (6 cups coated). In some possible implementation manners, in the spraying step, the spraying pressure is 0.4-0.6 MPa, the spraying width is 10-12 cm, the spraying distance is 15-30 cm, the overlapping range is 1/2-1/3, the spraying angle is 90 DEG + -1 DEG, and the nozzle diameter is 0.6-1.0 mm. In some possible implementations, the step of preparing the paint includes: Grinding and filtering a mixture containing resin slurry, the wear-resistant filler and the reinforcing filler to obtain the paint; Wherein the resin slurry comprises polyurea resin, hyperbranched hydroxyl polyester resin, organic silicon resin and auxiliary agent; In the grinding step, the average particle size of the mixture after grinding is less than 30 mu m. In some possible implementations, in the step of preparing the paint, the grinding step is performed until the average particle size of the mixture is 20 μm to 30 μm. In some possible implementations, the step of preparing the resin syrup includes: Mixing the polyurea resin, the hyperbranched hydroxyl polyester resin, the organic silicon resin and the auxiliary agent to obtain pre-dispersed slurry; grinding the pre-dispersed slurry to the average particle size of below 10 mu m, and filtering to obtain the resin slurry. In a third aspect, the invention provides an application of the polyurea elastic finish paint provided by the first aspect of the invention on a rail transit axle. Compared with the prior art, the polyurea elastic finish paint and the preparation method thereof have at least the following beneficial technical effects: (1) The polyurea elastic finish paint d