A code printing cloth, a preparation method and application thereof

Abstract

This invention relates to the field of laminate technology, and in particular to a coding fabric, its preparation method, and its application. The coding fabric is prepared from the following raw materials: glass fiber cloth, a black TPFE coating, a silver TPFE coating, and a transparent TPFE emulsion coating; wherein the raw materials for preparing the black TPFE coating include: 35-50 parts of PTFE emulsion A; 2 parts of carbon black; 0.5 parts of nonionic wetting agent; 0.3 parts of fluorocarbon dispersant; and deionized water to a total of 100 parts; the raw materials for preparing the silver TPFE coating include: 30-50 parts of PTFE emulsion B; 10 parts of fluorosilicone acrylate emulsion; 5 parts of aluminum powder; 1 part of silica; 0.2 parts of fluorocarbon wetting agent; and deionized water to a total of 100 parts; the raw materials for preparing the transparent TPFE emulsion coating include: 25 parts of high-purity PTFE emulsion C; 0.2 parts of fluorocarbon wetting agent; and deionized water to a total of 100 parts. By using black PTFE emulsion, FEP copolymer, and fluorosilane coupling agent for synergistic modification, the adhesion between the coating and the glass fiber substrate is significantly enhanced, forming a dense light-shielding background.

Description

Technical Field

[0001] This invention relates to the field of laminate technology, and in particular to a coding fabric, its preparation method, and its application. Background Technology

[0002] In fields such as industrial identification, product traceability, and anti-counterfeiting, QR code marking, as an efficient, high-information-density, and highly readable encoding method, has been widely used in the identification of electronic manufacturing, aerospace equipment, medical devices, and precision modules. To ensure that QR codes remain clearly identifiable for a long time under extreme conditions such as high temperature, high humidity, friction, and solvents, the industry is gradually shifting from ink-printed QR codes to laser-ablated QR codes.

[0003] Currently, laser QR codes are typically attached to plastic, metal, or coated materials, creating a black-and-white contrast pattern by ablation of the surface with a laser beam. However, existing laser QR code substrates still have the following technical problems:

[0004] Poor substrate thermal stability and adhesion: Traditional inks or polymer films are prone to scorching and blistering under high-temperature laser action, and have poor adhesion to inorganic substrates such as glass fiber, making them easy to peel off or cause uneven etching; Low contrast and blurred edges of QR code patterns: Conventional single-layer coatings cannot form high-contrast images through selective laser ablation, resulting in poor imaging contrast and a high error rate in QR code recognition; Easy delamination at the interface of multi-layer coating structures: Poor compatibility between multi-layer coatings makes them prone to delamination and peeling after hot pressing or bending, affecting durability; Difficulty in balancing laser responsiveness and surface protection: Transparent sealing layers lack ablation selectivity or have poor melting properties, making them impossible to remove precisely under laser action, severely affecting imaging quality.

[0005] Therefore, there is an urgent need to develop a QR code laser ablation substrate with stable structure, good laser responsiveness, strong adhesion, and clear image, so as to be suitable for high-requirement scenarios in high-end signage applications. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a coding cloth, the raw materials of which include: glass fiber cloth, black TPFE coating, silver TPFE coating, and transparent TPFE emulsion coating;

[0007] The raw materials for preparing the black TPFE coating include:

[0008] PTFE emulsion A 35-50 parts

[0009] 2 parts carbon black

[0010] 0.5 parts of nonionic wetting agent

[0011] 0.3 parts fluorocarbon dispersant

[0012] Add deionized water to bring the total to 100 parts;

[0013] The raw materials for preparing the silver TPFE coating include:

[0014] PTFE emulsion B 30-50 parts

[0015] 10 parts of fluorosilicone acrylate emulsion

[0016] 5 parts silver paste

[0017] 1 part precipitate

[0018] 0.2 parts of fluorocarbon wetting agent

[0019] Add deionized water to bring the total to 100 parts.

[0020] The raw materials for preparing the transparent TPFE emulsion coating include:

[0021] High-purity PTFE emulsion C 25 parts

[0022] 0.2 parts of fluorocarbon wetting agent

[0023] Add deionized water to bring the total to 100 parts.

[0024] In one embodiment of the present invention, the raw materials for preparing the black TPFE coating include: PTFE emulsion A with a solid content of 60% and a uniform particle size of less than 0.25 μm.

[0025] As one embodiment of the present invention, the raw materials for preparing the black TPFE coating further include: 10 parts of fluorinated ethylene propylene copolymer emulsion.

[0026] As one embodiment of the present invention, the raw materials for preparing the black TPFE coating further include: 1 part of polyether-modified silane.

[0027] As one embodiment of the present invention, the raw materials for preparing the silver TPFE coating further include: 5 parts of aluminum powder.

[0028] As one embodiment of the present invention, the raw materials for preparing the transparent TPFE emulsion coating further include: 3 parts of fluorinated modified acrylate emulsion and 2 parts of ethylene-trifluorochloroethylene copolymer emulsion.

[0029] As one embodiment of the present invention, the preparation method of the coding cloth is as follows: Select a glass fiber cloth with a thickness of 0.06mm, coat it with a black TPFE coating, and dry it (drying temperature 120-160℃). Repeat the coating three times, then coat it with a silver Teflon coating and dry it. Repeat the coating three times, and finally coat the silver surface with a layer of transparent Teflon emulsion coating to obtain the coding cloth.

[0030] As one embodiment of the present invention, the coding cloth described herein is applied in the field of electronic product components.

[0031] By adopting the above technical solution, the present invention has the following beneficial effects:

[0032] This invention provides a multilayer PTFE coated structure based on a glass fiber substrate and its preparation method, which is suitable for laser ablation to form QR code patterns and has the following beneficial effects:

[0033] A three-layer PTFE functional coating structure of "black-silver-transparent" is constructed. By utilizing the differences in laser absorption between different layers, the ablation depth can be precisely controlled to achieve high-contrast, high-resolution QR code pattern ablation without the need for additional ink or post-processing.

[0034] By using black PTFE emulsion, FEP copolymer, and fluorosilane coupling agent for synergistic modification, the adhesion between the coating and the glass fiber substrate is significantly enhanced, so that the bottom black film completely covers the fiber texture, forming a dense light-blocking background, thus solving the problem of poor adhesion of traditional PTFE on glass fiber cloth.

[0035] By introducing a composite structure of flake-shaped metallic pigment, inorganic filler, and copolymer emulsion into the silver intermediate layer, the difference in laser energy reflection and interlayer fusion are effectively enhanced, improving imaging clarity. After laser ablation, the edges are sharp and do not become mushy or diffuse.

[0036] The top transparent PTFE encapsulation layer is constructed using a specific fluoroacrylate copolymer system, which combines good transparency with laser etchability. It can achieve QR code protection encapsulation and can also be selectively decomposed and peeled off under laser action without obstructing the laser imaging of the underlying layer.

[0037] The three-layer coating system has good compatibility, strong adhesion, and high heat resistance. After film formation, it is free of pinholes, bubbles, and delamination. It can withstand the instantaneous high temperature during laser ablation and meet the industrial requirements for long-term preservation and identification in complex environments.

[0038] Suitable for durable marking needs in high-end electronic components, medical devices, military modules, etc., it can be widely used in automated laser marking lines to improve the durability, security and overall industrial recognition level of QR codes. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1This is a test image showing that the black layer in Example 2 of Test 2 has been damaged;

[0041] Figure 2 This is an enlarged view showing that the black layer in Example 2 has been damaged;

[0042] Figure 3 The QR code image from Example 1, after being rubbed 56 times, still yields satisfactory results when scanned. Detailed Implementation

[0043] The present invention will be further explained below with reference to specific embodiments.

[0044] Table 1 lists the manufacturers and brands of the specific raw materials.

[0045]

[0046]

[0047] The following detailed description is based on specific embodiments.

[0048] Table 2. Formulation descriptions of specific embodiments

[0049]

[0050]

[0051] The preparation methods of Examples 1 to 6 above are as follows: Select a glass fiber cloth with a thickness of 0.06 mm, coat it with a black TPFE coating, and dry it (drying temperature 135℃). Repeat the coating 3 times, then coat it with a silver Teflon coating and dry it. Repeat the coating 3 times, and finally cover the silver surface with a layer of transparent Teflon emulsion coating to obtain the coding cloth.

[0052] The principle of laser-printed QR codes: A laser head emits an energy beam that ablates the transparent and silver coatings on the surface. By experimenting and adjusting the laser parameters (frequency, power, etc.), the transparent and silver coatings are precisely ablated, exposing the black coating. The exposed black portion contrasts sharply with the unablated silver portion, forming a QR code pattern.

[0053] The UV laser marking machine used in this invention is manufactured by Guangzhou Heshen Electromechanical Technology Co., Ltd., and has a laser power of 5W.

[0054] Performance testing:

[0055] Test 1: Scan the QR code directly with a handheld scanner. If the scanned content matches the preset content and format, the QR code setup is successful; otherwise, it fails. This method can also be used to detect QR codes as the pressing pad ages.

[0056] Test 2: Degree of loss of black coating: After laser printing, the tester touched the QR code directly with his hand and there was obvious black coating peeling off, indicating that the black layer of the QR code has been damaged.

[0057] Test 3: QR code surface friction test:

[0058] Specific steps:

[0059] 2.1 After overlapping two layers of steel wool, place the sample to be tested at the positioning point of the testing machine and clamp it.

[0060] 2.2 Add a 1KG weight to the friction column, and then lower the friction column to contact the sample surface by adjusting the knob.

[0061] 2.3 The number of friction cycles is set to 1000, and the running speed is adjusted to 60±5 cycles / min.

[0062] 2.4 Press the green start button to start the testing machine.

[0063] 2.5 After rubbing for 1000 times, press the red stop button to stop the experiment, remove the sample and observe the surface condition. If there is wear, it is NG; if there is no wear, it is OK.

[0064] 2.6 Turn off the power switch to turn off the power.

[0065] The QR code section must be able to withstand more than 50 friction tests to pass.

[0066] Test 4: Check for pinholes, bubbles, and delamination after film formation.

[0067] Table 3 Performance Test Results

[0068]

[0069] in, Figure 1 This is a test image showing that the black layer in Example 2 of Test 2 has been damaged; Figure 2 This is an enlarged view showing that the black layer in Example 2 has been damaged; Figure 3 The QR code image from Example 1, after being rubbed 56 times, still yields satisfactory results when scanned.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of preparing a marking cloth, characterized in that, The steps are as follows: Select a 0.06mm thick glass fiber cloth, coat it with a black PTFE coating and dry it. Repeat the coating process 3 times, then coat it with a silver PTFE coating and dry it. Repeat the coating process 3 times, and finally cover the silver surface with a transparent PTFE emulsion coating to obtain the coding cloth. The raw materials for preparing the black PTFE coating include: PTFE emulsion A 35 parts 1 part of γ-aminopropyltriethoxysilane 10 parts of fluorinated ethylene propylene copolymer emulsion 2 parts carbon black 0.5 parts of nonionic wetting agent 0.3 parts fluorocarbon dispersant Add deionized water to bring the total to 100 parts; The raw materials for preparing the silver PTFE coating include: PTFE emulsion B 30 parts 10 parts of fluorosilicone acrylate emulsion 5 parts silver paste 1 part precipitate 0.2 parts of fluorocarbon wetting agent To bring the deionized water to 100 parts. The raw materials for preparing the transparent PTFE emulsion coating include: High-purity PTFE emulsion C 25 parts 3 parts of fluorinated modified acrylate emulsion 2 parts of ethylene-trifluorochloroethylene copolymer emulsion 0.2 parts of fluorocarbon wetting agent Add deionized water to bring the total to 100 parts; In the raw materials for preparing the black PTFE coating: the solid content of PTFE emulsion A is 60%, and the average particle size is less than 0.25 μm; The PTFE emulsion A is Dyneon™ TF 5035Z; the PTFE emulsion B is Dyneon™ TF 5035Z; and the high-purity PTFE emulsion C is Teflon™ PTFE 30B.

2. A marking cloth, characterized in that It is prepared by the preparation method described in claim 1.

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