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CN-122006995-A - Double-component in-situ curing wear-resistant coating process for polycarbonate transparent plate

CN122006995ACN 122006995 ACN122006995 ACN 122006995ACN-122006995-A

Abstract

The invention provides a two-component in-situ curing wear-resistant coating process of a polycarbonate transparent plate, and relates to the technical field of polycarbonate plates. The preparation process of the polycarbonate transparent plate bi-component in-situ curing wear-resistant coating comprises the bi-component coating preparation, vacuum auxiliary in-situ injection and gradient heating sectional curing process. The invention realizes the comprehensive improvement of the coating hardness, the adhesive force and the optical transparency by adopting a two-component acrylic polyurethane system and a thermal latent catalyst and combining vacuum-assisted in-situ forming and gradient heating sectional curing process, and has good application prospect.

Inventors

  • XIE CHAOXIANG
  • LIU JIAQUAN

Assignees

  • 上海高光新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The preparation process of the polycarbonate transparent plate double-component in-situ curing wear-resistant coating is characterized by comprising the following steps of: S1, preparing a double-component coating, namely mixing the component A and the component B to obtain the double-component reactive coating, wherein the viscosity of the double-component reactive coating is 500-mPa.s at 25 ℃ and the NCO/OH equivalent ratio is 0.95-1.10; The component A is a mixture of acrylic polyol resin and a leveling agent; the component B is a mixture of isocyanate curing agent and thermal latent catalyst; S2, vacuum assisted in-situ injection, namely constructing a cavity between the PC base material and the mold panel, vacuumizing the sealed cavity before injecting the coating, and injecting the two-component coating into the cavity through the multi-point distributed feed inlet; s3, gradient heating sectional curing, namely sequentially pre-curing and fully curing the coating formed in the step S2; the pre-curing temperature is 60-80 ℃, kept at 10-15 min and used for leveling and stress release, and the full-curing temperature is 120-140 ℃ and kept at 30-45 min.
  2. 2. The process according to claim 1, wherein the hydroxyl value of the acrylic polyol resin in the step S1 is 30-120 mg KOH/g.
  3. 3. The process according to claim 1, wherein the hydroxyl value of the acrylic polyol resin in the step S1 is 50-90 mg KOH/g.
  4. 4. The preparation process according to claim 1, wherein in the step S1, the leveling agent is at least one of an organosilicon modified polyether leveling agent, an acrylic leveling dispersion leveling agent, and a fluorocarbon surface active leveling agent, and the leveling agent accounts for 0.05% -1.0% of the mass of the component a.
  5. 5. The preparation process according to claim 1, wherein in the step S1, the leveling agent accounts for 0.05% -1.0% of the mass of the component a.
  6. 6. The preparation process according to claim 1, wherein in the step S1, the NCO content of the isocyanate curing agent is 10% -25%, and the thermal latent catalyst is a thermal latent tertiary amine catalyst.
  7. 7. The process of claim 6 wherein the thermally latent tertiary amine catalyst is DBU-1-naphthoate.
  8. 8. The preparation process according to claim 1, wherein in the step S1, the heat latent catalyst accounts for 0.01% -0.5% of the mass of the B component.
  9. 9. The process according to claim 1, wherein in step S1, the two-component reactive coating has a viscosity of 600 to 900 mPa S at 25 ℃ and an NCO/OH equivalent ratio of 1.00 to 1.05.
  10. 10. The preparation process according to claim 1, wherein in the step S2, the cavity gap is 0.3-0.8 mm, the thickness deviation is ±0.05 mm, and the vacuum degree of the sealed cavity is-0.08 MPa to-0.1 MPa.

Description

Double-component in-situ curing wear-resistant coating process for polycarbonate transparent plate Technical Field The invention relates to the technical field of polycarbonate plates, in particular to a two-component in-situ curing wear-resistant coating process of a polycarbonate transparent plate. Background Polycarbonate (PC) is widely used in the fields of aviation, automobiles, electronic communication and the like due to its excellent light transmittance, impact resistance and processability. However, PC has a low surface hardness and is extremely susceptible to scratches by physical abrasion, thereby reducing its lifetime and optical visual effects. The existing wear-resistant coating process mostly adopts spray coating, curtain coating or traditional injection compression molding, and the process has the problems of poor coating thickness uniformity, large environmental pollution, easy occurrence of surface flaws (such as pinholes and shrinkage cavities) and insufficient adhesive force of the coating and a substrate caused by overlarge internal stress, so that the application of PC plates in the field of high-precision optics is severely limited. Therefore, it is necessary to provide a process for preparing a PC transparent plate wear-resistant coating which can achieve a balance among high hardness, high adhesion and high optical properties. Disclosure of Invention In view of this, the invention provides a two-component in-situ curing wear-resistant coating process for a polycarbonate transparent plate. The invention realizes the comprehensive improvement of the coating hardness, the adhesive force and the optical transparency by adopting a two-component acrylic polyurethane system and a thermal latent catalyst and combining vacuum-assisted in-situ forming and gradient heating sectional curing process, and has good application prospect. A preparation process of a polycarbonate transparent plate two-component in-situ curing wear-resistant coating comprises the following steps: S1, preparing a double-component coating, namely mixing the component A and the component B to obtain a double-component reactive coating; The component A is a mixture of acrylic polyol resin and a leveling agent; the component B is a mixture of isocyanate curing agent and thermal latent catalyst; s2, vacuum assisted in-situ injection, namely constructing a cavity between the PC base material and the mold panel, vacuumizing the sealed cavity before injecting the coating, so that the coating is filled in a gap by vacuum driving and is self-leveled to form a coating, and injecting the two-component coating into the cavity through a multi-point distributed feed inlet; vacuum auxiliary in-situ injection drives filling through pressure difference, avoids high-pressure injection shearing stress, and promotes microbubbles in the coating to escape before solidification; s3, gradient heating sectional curing, namely sequentially pre-curing and fully curing the coating formed in the step S2; Preferably, in the step S1, the hydroxyl value of the acrylic polyol resin is 30-120 mg KOH/g, more preferably 50-90 mg KOH/g, the leveling agent is at least one of an organosilicon modified polyether leveling agent, an acrylic leveling dispersion leveling agent and a fluorocarbon surface active leveling agent, the leveling agent accounts for 0.05-1.0% of the mass of the component A, the NCO content of the isocyanate curing agent is 10-25%, the thermal latent catalyst is a thermal latent tertiary amine catalyst, the reaction rate is reduced in a pre-curing stage at 60-80 ℃ and the crosslinking reaction is promoted in a full curing stage at 120-140 ℃, and the thermal latent catalyst accounts for 0.01-0.5% of the mass of the component B. More preferably, the thermally latent catalyst is DBU-1-naphthoate. Preferably, the preparation method of the DBU-1-naphthoate thermal latent catalyst comprises the following steps: Drying the 1-naphthoic acid 2h in a vacuum drying oven at 60 ℃ to-0.09 MPa to remove the water adsorbed in the raw materials, wherein strict control of the water is a key precondition for avoiding subsequent side reaction with an isocyanate system and guaranteeing the latency of the catalyst; Accurately weighing raw materials according to the molar ratio of organic acid to DBU of 1.0 (0.9-1.1), adding pretreated 1-naphthoic acid into a dry reaction container, adding a metered anhydrous solvent, and stirring until the mixture is completely dissolved under the condition of heating in a water bath at room temperature (25 ℃) or 40 ℃ to form a clear and transparent organic acid solution, wherein the molar ratio of the organic acid to the DBU is 1:1; Slowly dripping DBU into the organic acid solution at the constant temperature of 25-40 ℃ and the dripping speed of 1-2 mL/min, wherein the stirring speed is maintained to be more than or equal to 300 rpm in the dripping process, and continuously stirring at the constant temperature for 30-60 min a