Heat treatment method for improving cracking problem of polycarbonate coating film layer

Abstract

The invention provides a heat treatment method for improving the cracking problem of a polycarbonate coating film layer, and belongs to the technical field of optical part manufacturing. The heat treatment method specifically comprises the steps that a goggle blank is subjected to ultrasonic cleaning; the goggle blank is subjected to high-temperature baking heat treatment, moisture on the surface and in the goggle blank is removed, and the internal stress of the goggle blank is evenly distributed in the goggle blank; coating the surface of the goggle blank with a film; the coated goggles are subjected to high and low temperature heat treatment, so that molecules and atoms in the coating layer are rearranged, the stress in the coating layer is evenly distributed, and through the treatment scheme, the problem of film layer cracking of the polycarbonate goggles is effectively solved, and the limitation of an existing concave ion source energy technology is effectively made up.

Description

Technical Field

[0001] The present application relates to the field of optical parts manufacturing, and in particular to a heat treatment method for improving the cracking problem of a polycarbonate coating film. Background Art

[0002] Polycarbonate has been widely used in the field of goggles due to its high transparency and high impact strength. However, due to its large thermal expansion coefficient, when the optical film layer coated on its surface is thick, it is easy to produce film cracking during severe environmental testing, which reduces the durability of the film. The existing method to improve the cracking of polycarbonate film is the concave ion source energy process, that is, adjusting the ion source parameters of each layer of the multi-layer film during coating, so that the ion source energy of the bottom and top layers is stronger, and the ion source energy of the middle film layer is weaker. This method has the following disadvantages:

[0003] (1) It is suitable for films with a small total number of layers and a small total thickness. When the number of layers is large, it is difficult to select ion source parameters. When the total thickness is large, the crack improvement effect is not obvious.

[0004] (2) It lacks universality for environmental test items and is only applicable to high temperature tests, but not to tests involving low temperature items;

[0005] (3) It is not suitable for parts with high requirements for transparency and smoothness. Polycarbonate is a relatively soft material, and the use of an ion source during coating will cause defects such as spots and hairiness on the local surface. Summary of the invention

[0006] In view of this, the present application provides a heat treatment method for improving the cracking problem of polycarbonate coating film, which solves the problems in the prior art, effectively improves the cracking problem of polycarbonate goggles film, and effectively compensates for the limitations of the existing concave ion source energy process.

[0007] The present application provides a heat treatment method for improving the cracking problem of polycarbonate coating film layer, which adopts the following technical solution:

[0008] A heat treatment method for improving the cracking problem of a polycarbonate coating film, comprising:

[0009] Step 1, ultrasonically cleaning the goggles;

[0010] Step 2, performing a high-temperature baking heat treatment on the goggles blank to remove moisture on the surface and inside of the goggles blank, so that the internal stress of the goggles blank is evenly distributed inside the blank;

[0011] Step 3, coating the surface of the goggles;

[0012] Step 4, subjecting the coated goggles to high and low temperature heat treatment to rearrange the molecules and atoms inside the coating layer and to evenly distribute the stress inside the coating layer.

[0013] Optionally, the ultrasonic cleaning parameters in step 1 are: ultrasonic frequency 20-80KHz, cleaning time 5-30min.

[0014] Optionally, in step 2, the goggles are subjected to high-temperature baking heat treatment, and the high-temperature baking treatment conditions are: starting from room temperature 25°C, the temperature inside the oven is increased to 80-110°C at a temperature change rate of 1-5°C / min, kept warm for 12-24 hours, and then the door of the oven is opened to allow the lenses to cool naturally to room temperature.

[0015] Optionally, in step 3, the coating method is vacuum evaporation coating, magnetron sputtering coating or ion sputtering coating, and the goggles are at room temperature during coating.

[0016] Optionally, the coating layer is a negative filter film, a spectroscopic film or an anti-laser film.

[0017] Optionally, in step 4, a high and low temperature test chamber is used to perform high and low temperature heat treatment on the coated goggles, and the high and low temperature treatment conditions are: the initial room temperature is 25°C, the oven is cooled to -50 to -60°C at a temperature change rate of 1-5°C / min, and kept warm for 24-48h, and the temperature is increased to 20°C at a temperature change rate of 1-5°C / min, and kept warm for 2-6h, and the temperature is increased to 70-80°C at a temperature change rate of 1-5°C / min, and kept warm for 24-48h, and then the box door is opened, and the lenses are naturally cooled to room temperature.

[0018] Optionally, when the goggles are heat treated in step 2 and step 4, the heat treatment is performed after the goggles are installed on a tooling, the tooling includes a bracket and a connecting structure, the connecting structure is installed on the bracket, the bracket is used to be placed in or fixed in the heat treatment equipment, and the connecting structure is used to connect to the connecting hole on the goggles, so that there is a gap between the goggles in the heat treatment equipment and the inner wall of the heat treatment equipment.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] High-temperature baking heat treatment of goggles can remove residual moisture from parts and improve the internal stress distribution caused by lens injection molding; high-temperature heat treatment of coated goggles can promote the integration and rearrangement of molecules and atoms inside the film layer, optimize the material microstructure, improve the stress distribution state, and reduce the risk of film cracking. Compared with goggles that have not been heat treated, the proportion of lenses with film cracking during environmental testing is significantly reduced after using this method. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the goggles in the embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the structure of the working example of the present application.

[0024] Explanation of the reference numerals: 1. goggles; 11. socket; 2. chassis; 21. bracket; 22. connecting column. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0027] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0029] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0030] The embodiment of the present application provides a heat treatment method for improving the cracking problem of a polycarbonate coating film.

[0031] A heat treatment method for improving the cracking problem of a polycarbonate coating film, comprising:

[0032] Step 1, ultrasonically clean the goggles; the ultrasonic cleaning parameters are: ultrasonic frequency 20-80KHz, cleaning time 5-30min, in the embodiment of the present application, ultrasonic frequency 40KHz, cleaning time 20min, after cleaning, use a strong flashlight to check the surface of the lens to ensure that the surface is in a clean state with a high-reliability film layer coated.

[0033] Step 2, high temperature baking heat treatment is performed on the goggles to remove moisture from the surface and inside of the goggles, so that the internal stress of the goggles is evenly distributed inside the goggles; the goggles are subjected to high temperature baking heat treatment, and the high temperature baking treatment conditions are: starting from room temperature 25°C, the internal temperature of the oven is raised to 80-110°C at a temperature change rate of 1-5°C / min, and the temperature is kept for 12-24 hours, and then the door is opened, and the lens is naturally cooled to room temperature. In the embodiment of the present application, the conditions for high temperature baking treatment are: the initial temperature is 25 degrees Celsius at room temperature, and the temperature is raised to 90°C at a temperature change rate of 5°C / min, and the temperature is kept for 12 hours, and then the door is opened, and the lens is naturally cooled to room temperature. This process can remove the residual moisture of the parts and improve the internal stress distribution caused by the lens injection molding process.

[0034] Step 3, coating the surface of the goggles; the coating method is vacuum evaporation coating, magnetron sputtering coating or ion sputtering coating, and the goggles are at room temperature during coating. The coating layer is a negative filter film, a spectroscopic film or an anti-laser film.

[0035] Step 4, subjecting the coated goggles to high and low temperature heat treatment to rearrange the molecules and atoms inside the coating layer and to evenly distribute the stress inside the coating layer. The coated goggles are subjected to high and low temperature heat treatment using a high and low temperature test chamber, and the conditions for high and low temperature treatment are: initially at room temperature of 25°C, the oven is cooled to -50 to -60°C at a temperature change rate of 1-5°C / min, kept warm for 24-48h, heated to 20°C at a temperature change rate of 1-5°C / min, kept warm for 2-6h, heated to 70-80°C at a temperature change rate of 1-5°C / min, kept warm for 24-48h, and then the door of the chamber is opened, and the lenses are naturally cooled to room temperature. In the embodiment of the present application, the high and low temperature treatment conditions are: initially at room temperature of 25°C, the oven is cooled to -55°C at a temperature change rate of 5°C / min, kept warm for 24 hours, heated to 20°C at a temperature change rate of 5°C / min, kept warm for 4 hours, heated to 70°C at a temperature change rate of 5°C / min, kept warm for 24 hours, and then the door is opened, and the lens is naturally cooled to room temperature. This process can promote the integration and rearrangement of molecules and atoms inside the film layer, optimize the microstructure of the material, improve the stress distribution state, and reduce the risk of film cracking.

[0036] like Figure 1 and Figure 2 As shown, when the goggles are heat treated in step 2 and step 4, the goggles 1 are installed on the tooling before the heat treatment is performed. The tooling includes a bracket 21 and a connecting structure. The connecting structure is installed on the bracket 21. The bracket is used to be placed in the heat treatment equipment or fixed in the heat treatment equipment. The connecting structure is used to connect with the connecting hole on the goggles so that there is a gap between the goggles in the heat treatment equipment and the inner wall of the heat treatment equipment. Among them, the tooling specifically also includes a chassis 2, and two brackets 21 are provided. The bottom end of the bracket 21 is fixedly connected to the chassis 2, and each bracket 21 is provided with two connecting posts 22. Each bracket 21 corresponds to one side of the goggles 1, and the two connecting posts 22 on the bracket 21 are inserted into the jack 11 on the side of the goggles.

[0037] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A heat treatment method for improving the cracking problem of polycarbonate coating film, characterized in that: include: Step 1, ultrasonically cleaning the goggles; Step 2, performing a high-temperature baking heat treatment on the goggles blank to remove moisture on the surface and inside of the goggles blank, so that the internal stress of the goggles blank is evenly distributed inside the blank; Step 3, coating the surface of the goggles; Step 4, subjecting the coated goggles to high and low temperature heat treatment to rearrange the molecules and atoms inside the coating layer and to evenly distribute the stress inside the coating layer.

2. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 1, characterized in that: The ultrasonic cleaning parameters in step 1 are: ultrasonic frequency 20-80KHz, cleaning time 5-30min.

3. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 1, characterized in that: In step 2, the goggles are subjected to high-temperature baking heat treatment, and the high-temperature baking treatment conditions are: starting from room temperature 25°C, the temperature inside the oven is increased to 80-110°C at a temperature change rate of 1-5°C / min, and kept warm for 12-24 hours, and then the door of the oven is opened, and the lenses are naturally cooled to room temperature.

4. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 1, characterized in that: In the step 3, the coating method is vacuum evaporation coating, magnetron sputtering coating or ion sputtering coating, and the goggles are at room temperature during coating.

5. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 4, characterized in that: The coating layer is a negative filter film, a spectroscopic film or an anti-laser film.

6. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 1, characterized in that: In the step 4, a high and low temperature test chamber is used to perform high and low temperature heat treatment on the coated goggles, and the high and low temperature treatment conditions are: the initial room temperature is 25°C, the oven is cooled to -50 to -60°C at a temperature change rate of 1-5°C / min, and kept warm for 24-48h, and the temperature is increased to 20°C at a temperature change rate of 1-5°C / min, and kept warm for 2-6h, and the temperature is increased to 70-80°C at a temperature change rate of 1-5°C / min, and kept warm for 24-48h, and then the box door is opened, and the lenses are naturally cooled to room temperature.

7. The heat treatment method for improving the cracking problem of polycarbonate coating film according to claim 1, characterized in that: When the goggles are heat treated in step 2 and step 4, the goggles are installed on a tooling before heat treatment. The tooling includes a bracket and a connecting structure. The connecting structure is installed on the bracket. The bracket is used to be placed in or fixed in the heat treatment equipment. The connecting structure is used to connect to the connecting hole on the goggles so that there is a gap between the goggles in the heat treatment equipment and the inner wall of the heat treatment equipment.

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