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CN-122008475-A - Glass surface treatment method capable of resisting high-temperature high-pressure injection molding shearing force

CN122008475ACN 122008475 ACN122008475 ACN 122008475ACN-122008475-A

Abstract

The invention discloses a glass surface treatment method capable of resisting high-temperature high-pressure injection shearing force, and relates to the technical field of glass surface treatment. Aiming at the problems that interfacial delamination, cracking, falling and sealing failure are easy to occur in the high-temperature high-pressure injection molding coating process of a glass product, the invention sequentially carries out decontamination cleaning, biphase activation, coating film forming, directional leveling, pre-curing and injection molding coating treatment on a glass substrate to form a three-belt type self-locking polymer bonding layer with the thickness of 8-18 micrometers on the surface of the glass. The three-belt type self-locking polymer bonding layer consists of a glass anchoring layer, a shearing buffer layer and a plastic affinity layer, wherein the glass anchoring layer and the glass surface form strong interface anchoring, the shearing buffer layer is used for absorbing injection shearing stress, and the plastic affinity layer and injection plastic form a high-compatibility interface.

Inventors

  • GU CHENGXIN

Assignees

  • 江西省亚华电子材料有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (9)

  1. 1. A glass surface treatment method capable of resisting high-temperature high-pressure injection molding shearing force, which is characterized by comprising the following steps: S1, decontaminating and cleaning a glass substrate, and drying; s2, performing biphase activation on the cleaned glass substrate to form a glass surface with high surface reactivity; s3, coating film forming liquid on the surface of the glass subjected to biphase activation, and forming a three-belt type self-attaching high polymer bonding layer through directional leveling, wherein the three-belt type self-attaching high polymer bonding layer consists of a glass anchoring layer close to a glass substrate, a middle shearing buffer layer and a plastic affinity layer close to injection molding plastic; s4, pre-curing the three-belt type self-attaching polymer bonding layer to form a stable self-crosslinking network; S5, placing the glass substrate subjected to the pre-curing treatment in an injection mold for injection coating, and enabling the injection molding plastic and the plastic affinity layer to complete interface combination under the conditions of high temperature and high pressure.
  2. 2. The glass surface treatment method capable of resisting high-temperature high-pressure injection shearing force as recited in claim 1, wherein the film forming liquid comprises the following components in parts by mass: 48 to 58 parts of ortho-diphenol phosphonic acid end group aromatic polyetherimide resin; 12 to 20 parts of benzoxazine-maleimide latent cross-linked resin; 8 to 16 parts of a styrene-acrylate-vinylpyrrolidone copolymer; 4 to 8 parts of a maleimide terminated flexible segmented resin; 1 to 4 parts of surface grafted nano silicon dioxide; 0.3 to 1.0 part of latent acid releasing agent; the balance of solvent.
  3. 3. A method of glass surface treatment resistant to shear forces of high temperature and high pressure injection molding as claimed in claim 2, wherein said directional leveling comprises the following conditions: The moving direction of the coating head is consistent with the flowing direction of the injection molding melt, and the running speed of the coating head is 30-80 mm/s; the glass substrate is provided with an uncoated selvedge tape having a width of 1.0 mm to 2.0 mm at its periphery.
  4. 4. A glass surface treatment method resistant to high temperature high pressure injection shear force according to claim 3, wherein the biphasic activation comprises alkali fog activation and ozone ultraviolet activation, and the alkali fog activation is performed prior to the ozone ultraviolet activation.
  5. 5. The method for treating the glass surface capable of resisting high-temperature high-pressure injection shearing force as recited in claim 4, wherein the alkali fog activation condition is that the activation liquid temperature is 35-45 ℃, the activation time is 40-90 seconds, and the ozone ultraviolet activation condition is that 185 nm ozone is activated for 2-5 minutes and 254 nm ultraviolet is activated for 1-3 minutes.
  6. 6. The method for treating a glass surface resistant to shearing force of high temperature and high pressure injection molding according to claim 5, wherein the pre-curing comprises a first stage pre-curing and a second stage pre-curing, wherein the first stage pre-curing is performed at 80 ℃ to 110 ℃ for 3 minutes to 6 minutes, and the second stage pre-curing is performed at 120 ℃ to 150 ℃ for 1 minute to 3 minutes.
  7. 7. The method of claim 6, wherein the three-belt type self-attaching polymeric adhesive layer has a total thickness of 8 to 18 microns, wherein the glass anchoring layer has a thickness of 1 to 3 microns, the shear buffer layer has a thickness of 4 to 10 microns, and the plastic affinity layer has a thickness of 2 to 5 microns.
  8. 8. The method for treating glass surface capable of resisting high-temperature high-pressure injection shearing force according to claim 7, wherein the injection molding plastic is one of PC, ABS, PC/ABS, PA6, PBT and PPS, the injection-coated barrel temperature is 220 ℃ to 330 ℃, and the injection pressure is 80 mpa to 150 mpa.
  9. 9. The method for treating a glass surface capable of resisting high-temperature and high-pressure injection molding shear force according to claim 8, wherein the glass anchoring layer is formed by enriching the ortho-diphenol phosphonic acid end group aromatic polyetherimide resin, the shear buffer layer is formed by enriching the benzoxazine-maleimide latent cross-linked resin and the maleimide end group flexible segment resin, and the plastic affinity layer is formed by enriching the styrene-acrylate-vinyl pyrrolidone copolymer.

Description

Glass surface treatment method capable of resisting high-temperature high-pressure injection molding shearing force Technical Field The invention relates to the technical field of glass surface treatment, in particular to a glass surface treatment method capable of resisting high-temperature high-pressure injection molding shearing force. Background In consumer electronics, instrument housings, automotive parts, sealing windows and functional trim, it is often desirable to injection mold the glass article with plastic to achieve an integrated appearance, structural strength and sealing performance. The existing glass has low surface energy, strong surface chemical inertia and poor compatibility with injection molding plastics, and is simultaneously subjected to high temperature, gate impact, high-pressure filling and shearing flow in the injection molding process, so that the problems that interfacial delamination is formed between the glass and the plastics, the interfacial part is cracked, the falling off occurs after injection molding, the tightness of the finished product is reduced, the strength is insufficient and the yield is reduced are very easy to occur. Existing solutions typically rely on primer, conventional silane coupling agents, plasma treatment, flame treatment, or a single adhesive system. Although the adhesive performance of the scheme can be improved in part of the scenes, the problems of insufficient temperature resistance, more process steps, insufficient stability, poor mass production suitability and weak interface shearing resistance still exist in a high-temperature high-pressure injection shearing environment. Particularly when glass and plastic are subjected to both thermal stress and flow shear stress, it is difficult for a single interface activation means to remain effectively bonded for a long period of time. Disclosure of Invention The glass surface treatment method capable of resisting high-temperature high-pressure injection shearing force comprises the following steps of S1, cleaning a glass substrate in a decontaminating mode and drying the glass substrate, S2, conducting biphase activation on the cleaned glass substrate to form a glass surface with high surface reactivity, S3, coating film forming liquid on the biphase activated glass surface, and forming a three-belt type self-locking polymer bonding layer through directional leveling, wherein the three-belt type self-locking polymer bonding layer is composed of a glass anchoring layer close to the glass substrate, a shearing buffer layer in the middle and a plastic affinity layer close to injection molding plastic, S4, conducting pre-curing on the three-belt type self-locking polymer bonding layer to enable the three-belt type self-locking polymer bonding layer to form a stable self-crosslinking network, and S5, placing the pre-cured glass substrate in an injection mold to conduct injection molding coating to enable the injection molding plastic and the plastic affinity layer to be combined at an interface under high temperature and high pressure. Preferably, the film forming liquid comprises 48 to 58 parts of ortho-diphenol phosphonic acid end group aromatic polyetherimide resin, 12 to 20 parts of benzoxazine-maleimide latent crosslinking resin, 8 to 16 parts of styrene-acrylic ester-vinyl pyrrolidone copolymer, 4 to 8 parts of maleimide end-capped flexible chain segment resin, 1 to 4 parts of surface grafted nano silicon dioxide, 0.3 to 1.0 part of latent acid releasing agent and the balance of solvent according to mass parts. Preferably, the directional leveling comprises the following conditions that the moving direction of the coating head is consistent with the flowing direction of injection molding melt, the running speed of the coating head is 30-80 mm/s, and the periphery of the glass substrate is provided with an uncoated sealing strip with the width of 1.0-2.0 mm. Preferably, the biphasic activation comprises an alkali mist activation and an ozone uv activation, and the alkali mist activation is performed prior to the ozone uv activation. Preferably, the alkali fog activation condition is that the temperature of an activation solution is 35-45 ℃ and the activation time is 40-90 seconds, and the ozone ultraviolet activation condition is that 185-nanometer ozone is activated for 2-5 minutes and 254-nanometer ultraviolet is activated for 1-3 minutes. Preferably, the pre-curing includes a first stage pre-curing under conditions of 80 degrees celsius to 110 degrees celsius for 3 minutes to 6 minutes and a second stage pre-curing under conditions of 120 degrees celsius to 150 degrees celsius for 1 minute to 3 minutes. Preferably, the total thickness of the three-belt self-attaching polymer adhesive layer is 8-18 micrometers, wherein the thickness of the glass anchoring layer is 1-3 micrometers, the thickness of the shearing buffer layer is 4-10 micrometers, and the thickness of the plastic affinity layer is 2-5 m