Environment-friendly alkaline degreasing agent for non-conductive printed circuit board material, production process and application thereof

Abstract

The application relates to the field of printed circuit board production processes, in particular to an environment-friendly alkaline degreasing agent for non-conductive printed circuit board materials, a production process and application. The environment-friendly alkaline degreasing agent is composed of the following raw materials: 70-90 g / L of an environment-friendly alkali source, 3-8 g / L of a surfactant, 5-12 g / L of a stabilizing auxiliary agent, 1-8 g / L of modified citrate, 0.1-0.5 g / L of an antioxidant and the balance of water; the environment-friendly alkali source is a mixture of multiple kinds of sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine and sodium gluconate, wherein at least one kind is potassium hydroxide; and the stabilizing auxiliary agent is composed of boronized polyisobutylene succinimide, branched polyether and hydrophilic modified cellulose nanocrystals. The above technical scheme can achieve uniformity and good degreasing effect in batch degreasing process, and guarantees the quality and production efficiency of products.

Description

Technical Field

[0001] This application relates to the field of printed circuit board manufacturing processes, and more specifically, it relates to an environmentally friendly alkaline degreasing agent for non-conductive printed circuit board materials, its manufacturing process, and its application. Background Technology

[0002] Printed circuit boards (PCBs) play a crucial role in the electronics industry due to their ability to achieve high-density wiring. With the continuous improvement of integrated circuit integration and advancements in mounting technology, PCB wiring density is also rapidly increasing. This trend has enabled further miniaturization of electronic products, perfectly meeting the demands of modern electronic devices for compact designs, and driving electronic devices towards thinner, lighter, and more portable designs. PCBs have wide and important applications in many fields, including consumer electronics, industrial control, and aerospace.

[0003] In the production process of printed circuit boards (PCBs), common steps include acid immersion, full-board copper plating, pattern transfer, degreasing, and chemical copper deposition. Especially after the full-board copper plating and pattern transfer processes, residual ink, adhesive, grease, sludge, and other contaminants inevitably appear on the circuit surface. To remove these contaminants and ensure the PCB multilayer board surface is clean and wettable, facilitating subsequent chemical copper deposition, a degreasing step is essential. Currently, the industry commonly uses degreasing agents for PCBs. Alternatively, degreasing can be performed on individual PCBs, or the degreasing agent can be replaced or replenished to maintain the degreasing effect.

[0004] Existing degreasing agents often leave stains on the surface of printed circuit boards (PCBs) after mass production, especially for PCBs made from non-conductive materials such as glass, ceramics, polyimide, PET, epoxy resin, fiberglass, and high-frequency board substrates. These PCBs exhibit more staining issues, or the grease on the surface is not completely removed, thus reducing the degreasing efficiency and quality for PCBs made from non-conductive materials. Degreasing a single PCB is inefficient, and frequent changes to degreasing agents significantly impact production efficiency. Furthermore, each change increases production costs, placing multiple pressures on companies in PCB manufacturing, balancing efficiency, cost, and product quality. Summary of the Invention

[0005] In order to improve the uniformity and pass rate of degreasing of batch non-conductive printed circuit board materials, this application provides an environmentally friendly alkaline degreasing agent, production process and application for non-conductive printed circuit board materials.

[0006] In a first aspect, this application provides an environmentally friendly alkaline degreasing agent for non-conductive printed circuit board materials, composed of the following raw materials: environmentally friendly alkaline source: 70-90 g / L; surfactant: 3-8 g / L; stabilizing agent: 5-12 g / L; modified citrate: 1-8 g / L; antioxidant: 0.1-0.5 g / L; the balance being water; wherein the environmentally friendly alkaline source is a mixture of various substances selected from sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine, and sodium gluconate, wherein at least one of them is potassium hydroxide; the stabilizing agent is composed of boronized polyisobutylene succinimide, branched polyether, and hydrophilically modified cellulose nanocrystals.

[0007] By adopting the above technical solution, the boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals in the stabilizing agent work synergistically to precisely regulate the physicochemical properties of the degreasing agent. This ensures that the degreasing environment of each material is highly consistent and stable during batch processing of non-conductive printed circuit board materials, greatly avoiding quality differences caused by environmental fluctuations and significantly improving the quality stability of non-conductive printed circuit board materials after batch processing. The stabilizing agent and modified citrate have a strong synergistic effect, which can effectively handle a wider variety of non-conductive printed circuit board materials for efficient degreasing. After degreasing, there is no oil residue on the surface of the non-conductive printed circuit board materials, which greatly improves the pass rate of the degreasing non-conductive printed circuit board materials, effectively reduces the number of defective products caused by incomplete degreasing, and significantly reduces production costs. The environmentally friendly alkali source, surfactant, stabilizing agent, modified citrate, and antioxidant in the raw material system work together synergistically to comprehensively guarantee the quality and excellent degreasing effect after batch degreasing. The entire degreasing agent system is environmentally friendly and pollution-free, which highly meets the strict environmental protection requirements of modern industrial production.

[0008] Environmentally friendly alkaline sources provide a suitable and stable alkaline environment, strongly promoting the rapid removal of oil stains; surfactants significantly reduce the interfacial tension between the degreasing agent and the oil stains, making it easy for the oil stains to detach from the material surface; stabilizing agents ensure the smoothness and efficiency of the degreasing process; modified citrate and antioxidants play unique roles, jointly enhancing the degreasing effect. This not only improves the degreasing stability and effect of the environmentally friendly alkaline degreasing agent, thereby improving the quality of non-conductive printed circuit board materials, but also allows the material to fully contact and react with the copper plating solution in the subsequent chemical copper plating process, achieving excellent copper plating results. This significantly improves the stability and quality stability of printed circuit board production, reduces defects in printed circuit boards caused by improper material surface treatment, and enhances the market competitiveness of the products.

[0009] Preferably, the environmentally friendly alkaline source is composed of sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine, and sodium gluconate, wherein the potassium hydroxide content is >60wt%.

[0010] By adopting the above technical solution, the environmentally friendly alkaline source is composed of sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine, and sodium gluconate, with a potassium hydroxide content >60wt%. When combined with other raw materials, it can provide a more suitable alkaline environment during the degreasing process, promoting the removal of oil stains. At the same time, these alkaline sources are environmentally friendly, making the entire degreasing agent system meet the environmental protection requirements of modern industrial production. This helps to improve the degreasing stability and degreasing effect of the environmentally friendly alkaline degreasing agent, thereby improving the quality of non-conductive printed circuit board materials.

[0011] Preferably, the weight ratio of the boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals is 1:(1-3):(3-5).

[0012] By adopting the above technical solution, in conjunction with environmentally friendly alkaline sources, surfactants, modified citrate, antioxidants, and an appropriate amount of water, the stabilizing agent can significantly improve the surface uniformity of non-conductive printed circuit boards in continuous batch processing through the synergistic effect of boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals. This enhances the material quality stability of non-conductive printed circuit boards after batch processing. The stabilizing agent and modified citrate work synergistically to enhance degreasing ability and improve the material qualification rate after degreasing. The components in the raw material system work together to ensure the quality and effect of batch degreasing while being environmentally friendly. It also helps to improve the copper plating effect of subsequent chemical copper plating processes and the production stability and quality stability of printed circuit boards.

[0013] Preferably, the hydrophilic modified cellulose nanocrystals are carboxylated modified cellulose nanocrystals and / or sulfonated modified cellulose nanocrystals.

[0014] By adopting the above technical solutions, in terms of surface charge and dispersion, carboxylation and sulfonation modification cause the nanocrystals to carry a negative surface charge in an alkaline environment, forming electrostatic repulsion and preventing self-agglomeration. This allows the degreaser to form a stable colloidal dispersion, ensuring uniform distribution of components. In terms of wetting and penetration, carboxyl and sulfonic acid groups reduce the surface tension of the degreaser, making it easier to wet the circuit board surface and penetrate into tiny crevices and pores to remove oil stains. In terms of adsorption and emulsification, carboxyl and sulfonic acid groups adsorb oil stains and promote emulsification, allowing the oil stains to detach from the circuit board surface and disperse into the solution to prevent re-adhesion. Overall, this improves degreasing efficiency, shortens degreasing time, and increases degreasing speed; improves degreasing quality, deeply cleans circuit boards, and reduces secondary pollution; enhances the stability of the degreaser, ensuring its chemical and physical stability; and is environmentally friendly and sustainable, as the nanocrystals are biodegradable, and the high-efficiency degreasing performance reduces the amount of degreaser used and the number of degreasing cycles.

[0015] Both carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals are dispersions in liquid form.

[0016] Preferably, the hydrophilic modified cellulose nanocrystals are composed of carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals.

[0017] By adopting the above technical solution, the stabilizing agents in the environmentally friendly alkaline degreasing agent, including boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals, are combined in a specific ratio to improve the quality stability of non-conductive printed circuit board materials after batch processing. The stabilizing agents and modified citrate enhance the degreasing application range and improve the material qualification rate after degreasing. The synergistic effect of the raw material system ensures the quality and effect of batch degreasing while being environmentally friendly, which helps to improve the copper plating effect of subsequent chemical copper plating processes and the production stability and quality stability of printed circuit boards. On this basis, the hydrophilic modified cellulose nanocrystals are made of carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals. The two work together in terms of surface charge and dispersion to form a stable colloidal dispersion in the degreasing agent system. They work together in terms of wetting and penetration to allow the degreasing agent to better penetrate into the tiny gaps and pores of the circuit board. They work together in terms of adsorption and emulsification to adsorb and emulsify the oil stains from the surface of the circuit board and disperse them into the alkaline solution to prevent re-adhesion. Overall, this can improve degreasing efficiency, improve degreasing quality, enhance the stability of the degreasing agent, and has the advantages of environmental protection and sustainability.

[0018] Preferably, the surfactant is a fatty alcohol polyoxyethylene ether and / or an alkyl glycoside.

[0019] By adopting the above technical solution, the environmentally friendly alkaline degreasing agent uses fatty alcohol polyoxyethylene ether and / or alkyl glycoside as surfactants, which can reduce the interfacial tension between the degreasing agent and oil stains, making it easier for oil stains to detach from the surface of non-conductive printed circuit board materials. Moreover, the environmentally friendly alkaline source, surfactant, stabilizing agent, modified citrate, and antioxidant work together to ensure the quality and degreasing effect after batch degreasing, making the entire degreasing agent system environmentally friendly and pollution-free, improving the degreasing stability and degreasing effect of the environmentally friendly alkaline degreasing agent, and thus improving the quality of non-conductive printed circuit board materials.

[0020] Preferably, the modified citrate is one or more of the following: hydroxyethylidene diphosphonic acid-citric acid complex salt, N,N-dimethylphenylethylamine citrate, long-chain alkyl citrate, and betaine citrate.

[0021] By adopting the above technical solution, one or more of the following—hydroxyethylidene diphosphonic acid-citric acid complex salt, N,N-dimethylphenylethylamine citrate, long-chain alkyl citrate, and betaine citrate—are used as modified citrates. These citrates work synergistically with stabilizing agents to enhance the degreasing ability of the degreasing agent, expand its application range, and ensure that there is no oil residue on the surface of non-conductive printed circuit board materials after degreasing. This improves the material qualification rate and reduces production costs. Simultaneously, by combining the degreasing agent with environmentally friendly alkaline sources, surfactants, stabilizing agents, and antioxidants, the quality and degreasing effect after batch degreasing can be guaranteed, the degreasing stability can be improved, and the degreasing agent system can be made environmentally friendly and pollution-free, thereby improving the quality of non-conductive printed circuit board materials.

[0022] The combination of N,N-dimethylphenylethylamine citrate and betaine citrate has a synergistic effect, and the addition of the stabilizing agent in this application further enhances the degreasing effect and quality, ensuring the uniformity of the surface of each non-conductive printed circuit board material after batch degreasing and improving its pass rate after degreasing.

[0023] Preferably, the antioxidant is tea polyphenols.

[0024] By adopting the above technical solution, tea polyphenols are used as an antioxidant in combination with environmentally friendly alkali sources, surfactants, stabilizing agents, and modified citrates to ensure the quality and degreasing effect after batch degreasing, improve the degreasing stability and degreasing effect of the degreasing agent, and thus improve the quality of non-conductive printed circuit board materials. Moreover, the entire degreasing agent system is environmentally friendly and pollution-free.

[0025] Secondly, a method for preparing an environmentally friendly alkaline degreasing agent for non-conductive printed circuit board materials is provided, which is obtained by the following method: weighing environmentally friendly alkaline source, surfactant, stabilizing agent, modified citrate, antioxidant and water by weight percentage and mixing them evenly to obtain the environmentally friendly alkaline degreasing agent.

[0026] By adopting the above technical solution, an environmentally friendly alkaline degreasing agent is prepared by weighing and mixing environmentally friendly alkali source, surfactant, stabilizing agent, modified citrate, antioxidant and water according to a specific weight percentage. This can improve the quality stability of non-conductive printed circuit board materials after batch processing, enhance degreasing ability and improve the material qualification rate after degreasing, ensure the quality and effect of batch degreasing while being environmentally friendly, and improve the copper plating effect of subsequent chemical copper process and the production stability and quality stability of printed circuit boards.

[0027] If the environmentally friendly alkaline source contains a specific proportion of potassium hydroxide, the degreasing effect can be further guaranteed. If the components in the stabilizing agent are composed in a specific weight ratio, the stability of the degreasing process can be improved. If the hydrophilic modified cellulose nanocrystals are carboxylated and / or sulfonated modified cellulose nanocrystals, the degreasing agent system can form a stable colloidal dispersion, achieving synergy between surface charge and dispersion, wetting and penetration, and adsorption and emulsification, thereby improving degreasing efficiency, degreasing quality, and stability of the degreasing agent, and possessing environmental and sustainability advantages. Furthermore, branched polyethers, with their excellent wetting properties, enable the degreasing agent to quickly wet the surface being cleaned, increasing the contact area between the degreasing agent and the oil. At this point, the dispersing properties of boronized polyisobutylene succinimide are fully utilized, rapidly dispersing the wetted oil into fine particles, combined with the effect of the hydrophilic modified cellulose nanocrystals. The synergistic effect of these three factors greatly shortens the time it takes for oil to detach from the surface being cleaned, improving degreasing efficiency.

[0028] If the surfactant is a fatty alcohol polyoxyethylene ether and / or alkyl glycoside, the interfacial tension between the degreaser and the oil can be reduced; if the modified citrate is a combination of N,N-dimethylphenylethylamine citrate and betaine citrate, it will have a synergistic effect with the stabilizing agent, further enhancing the degreasing ability; if the antioxidant is tea polyphenol, it can work with other ingredients to improve the degreasing effect.

[0029] Thirdly, the application of an environmentally friendly alkaline degreasing agent involves applying an environmentally friendly alkaline degreasing agent to degrease non-conductive printed circuit board materials, wherein the degreasing temperature is 55-65% and the degreasing time is 6-8 minutes.

[0030] By adopting the above technical solution, the environmentally friendly alkaline source provides a suitable alkaline environment to promote oil removal and is environmentally friendly. Surfactants reduce the interfacial tension between the degreasing agent and the oil, making the oil easier to detach. The stabilizing agents, including boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals, synergistically improve the surface uniformity of non-conductive printed circuit boards in continuous batch processing and enhance the degreasing ability with modified citrate. Modified citrate and antioxidants play a unique role in improving the degreasing effect. Overall, the batch degreasing quality and effect are guaranteed while remaining environmentally friendly. The potassium hydroxide content in the environmentally friendly alkaline source is >60wt%, which can further promote oil removal. Specific heavy... The ratio of boronized polyisobutylene succinimide, branched polyether, and hydrophilically modified cellulose nanocrystals optimizes and stabilizes the performance of the auxiliary agent. The synergistic effect of carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals achieves synergistic effects of surface charge and dispersion, wetting and penetration, and adsorption and emulsification, thereby improving degreasing efficiency, degreasing quality, and stability of the degreasing agent while being environmentally friendly and sustainable. At a degreasing temperature of 55-65% and a degreasing time of 6-8 minutes, it can effectively remove oil stains from the surface of non-conductive printed circuit board materials, ensuring the cleanliness of the material surface and improving the copper plating effect of subsequent chemical copper plating processes, as well as the production stability and quality stability of printed circuit boards.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Improve the quality stability of non-conductive printed circuit board materials after batch processing, and stabilize the components in the auxiliary agent to synergistically regulate the physicochemical properties of the degreasing agent, so that the degreasing environment of each material is more stable and consistent;

[0033] 2. Enhances degreasing ability and improves the qualified rate of degreased materials, stabilizes the synergistic effect of auxiliary agents and modified citrate, expands the application range of degreasing agents, and reduces the number of defective products;

[0034] 3. Ensures high-quality and effective batch degreasing while being environmentally friendly. The raw materials work together, with an environmentally friendly alkali source providing an alkaline environment and surfactants reducing interfacial tension, all working together to improve the degreasing effect without causing pollution.

[0035] 4. Improves the copper plating effect of subsequent chemical copper plating processes and the production stability and quality stability of printed circuit boards, effectively removes oil stains to ensure the cleanliness of material surfaces, and reduces defects in printed circuit boards. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the embodiments.

[0037] Sources of some raw materials:

[0038] Boronized polyisobutylene succinimide: Jinzhou Chenghua New Materials Co., Ltd., model dispersant T154B;

[0039] Branched polyethers: German technical background, Volker

[0040] Carboxylated modified cellulose nanocrystals: Nanjing Tianlu Nanotechnology Co., Ltd., Model C-CNC;

[0041] Sulfonated modified cellulose nanocrystals: Nanjing Tianlu Nanotechnology Co., Ltd., model S-CNC;

[0042] Fatty alcohol polyoxyethylene ether: Shanghai Zhenlishi Network Technology Co., Ltd., model Disponil A 3065;

[0043] Alkyl glycoside, CAS No. 68515-73-1;

[0044] N,N-Dimethylphenylethylamine citrate: Model Darl-1, Hubei Darli Chemical Co., Ltd.

[0045] Betaine citrate: CAS No. 17671-50-0.

[0046] Example

[0047] Example 1

[0048] An environmentally friendly alkaline degreasing agent for non-conductive printed circuit board materials is prepared by the following method:

[0049] Weigh out 70g / L of environmentally friendly alkaline source, 8g / L of surfactant, 12g / L of stabilizing agent, 1g / L of modified citrate, 0.1g / L of antioxidant, and 908.9g / L of water by weight percentage and place them in a stirring device. Heat to 60℃ and stir at 100r / min for 30min to dissolve all materials and mix thoroughly to obtain an environmentally friendly alkaline degreasing agent.

[0050] The hydrophilic modified cellulose nanocrystals are carboxylated modified cellulose nanocrystals; the antioxidant is tea polyphenols; the modified citrate is N,N-dimethylphenylethylamine citrate; the surfactant is alkyl glycoside; the environmentally friendly alkaline source is composed of sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine, and sodium gluconate in a weight ratio of 2:2:13:1:1:1.

[0051] Example 2-3

[0052] The difference between Examples 2-3 and Example 1 is that the amount of raw materials used is different, as shown in Table 1.

[0053] Table 1. Raw material usage (g / L) for Examples 1-3

[0054]

[0055] Example 4

[0056] The difference between Example 4 and Example 2 is that the hydrophilic modified cellulose nanocrystals are sulfonated modified cellulose nanocrystals.

[0057] Example 5

[0058] The difference between Example 5 and Example 2 is that the hydrophilic modified cellulose nanocrystals are composed of carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals in a weight ratio of 3:1.

[0059] Example 6

[0060] The difference between Example 6 and Example 5 is that the modified citrate is betaine citrate.

[0061] Example 7

[0062] The difference between Example 7 and Example 5 is that the modified citrate is composed of N,N-dimethylphenylethylamine citrate and betaine citrate in a weight ratio of 1:2.

[0063] Example 8

[0064] The difference between Example 8 and Example 7 is that the surfactant is composed of fatty alcohol polyoxyethylene ether and alkyl glycoside in a weight ratio of 1.3:0.7.

[0065] Comparative Example

[0066] Comparative Example 1

[0067] The difference between Comparative Example 1 and Example 2 is that the modified citrate is replaced with an equal amount of sodium citrate.

[0068] Comparative Example 2

[0069] The difference between Comparative Example 2 and Example 2 is that boronized polyisobutylene succinimide was replaced with branched polyether in equal amounts.

[0070] Comparative Example 3

[0071] The difference between Comparative Example 3 and Example 2 is that the branched polyether was replaced in equal amounts with hydrophilic modified cellulose nanocrystals. Comparative Example 4

[0072] The difference between Comparative Example 4 and Example 2 is that the stabilizing agent is hydrophilic modified cellulose nanocrystals.

[0073] Application examples

[0074] Application Example 1

[0075] An application of an environmentally friendly alkaline degreasing agent: The environmentally friendly alkaline degreasing agent obtained in Example 1 is applied to the degreasing of non-conductive printed circuit board materials, wherein the degreasing temperature is 60°C and the degreasing time is 7 minutes.

[0076] Application Example 2-12

[0077] The difference between Application Example 2-12 and Application Example 1 is that the source of the environmentally friendly alkaline degreasing agent is different, as shown in Table 2.

[0078] Table 2 Sources of Environmentally Friendly Alkaline Degreasing Agents in Application Examples 1-12

[0079] Application examples Sources of environmentally friendly alkaline degreasing agents Application Example 1 Example 1 Application Example 2 Example 2 Application Example 3 Example 3 Application Example 4 Example 4 Application Example 5 Example 5 Application Example 6 Example 6 Application Example 7 Example 7 Application Example 8 Example 8 Application Example 9 Comparative Example 1 Application Example 10 Comparative Example 2 Application Example 11 Comparative Example 3 Application Example 12 Comparative Example 4

[0080] Performance testing

[0081] Detection methods / test methods

[0082] Batch degreasing was performed according to the degreasing method in Application Examples 1-12;

[0083] Sample: The non-conductive printed circuit board material is aluminum nitride ceramic substrate circuit board (Shenzhen Yiyuan Electronics Co., Ltd., model 4PG1618A0, double layer, reinforcement material: glass fiber cloth, insulating resin: epoxy resin, length approximately 10cm, width approximately 5cm, thickness 0.2mm), and a 2g / m² coating is uniformly applied to its surface. 2 Green oil, degreasing temperature 60℃, degreasing time 7min.

[0084] 1) Place 100 samples at a 45° angle in the container rack. The container rack has multiple layers, with 20 samples in each layer and a 15cm interval between each layer. The distance between two adjacent samples is 5cm. The samples in adjacent layers are staggered. The amount of environmentally friendly alkaline degreasing agent is 80L. When the container rack containing the samples is placed in the degreasing tank containing the environmentally friendly alkaline degreasing agent, the environmentally friendly alkaline degreasing agent completely submerges all the samples.

[0085] 2) When processing 200 samples, 40 samples are placed in each layer, with a 12cm interval between each layer and a 3cm distance between adjacent samples. Samples in adjacent layers are staggered, and the rest is the same as in 1).

[0086] 3) When processing 300 samples, 50 samples are placed in each layer, with a 12cm interval between each layer and a 2cm interval between adjacent samples. Samples in adjacent layers are staggered, and the rest is the same as in 1).

[0087] After degreasing, rinse the product in a clean water tank for 1 minute at a flow rate of 1 L / min. Then, place it in an oven and dry at 100℃ for 5 minutes. After resting at room temperature for 2 hours, observe the surface with a 50x magnifying glass to check for watermarks, discoloration, or other abnormalities. Further test the degreasing performance of products without these surface phenomena. Take three test points on each side and draw a 2cm line on the surface with a 40# dyne pen at a pressure of 2N. After 3 seconds, observe the surface with a 10x magnifying glass for shrinkage. Any sample showing shrinkage is considered unqualified. Count the number of unqualified samples and calculate the pass rate.

[0088] The specific data from the above experiments are shown in Table 3.

[0089] Table 3 Experimental data from Application Examples 1-14

[0090]

[0091]

[0092] Combining Application Examples 2 and 8-12 with Table 3, it can be seen that as the number of samples processed in batches increases, the pass rate of the environmentally friendly alkaline degreasing agents used in Application Examples 8-12 (corresponding to Comparative Examples 1-4) after degreasing is significantly reduced, even below about 60%, while that in Example 2 remains at about 90%. This indicates that the boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals in the stabilizing auxiliary agent of this application have a synergistic effect, and combined with modified sodium citrate, they enhance the degreasing effect, improve the uniformity and efficiency of degreasing.

[0093] Combining Application Examples 2, 4, and 5 with Table 3, it can be seen that when the batch size reaches 300 samples, the pass rate of Application Example 5 reaches over 96%, while Application Examples 2 and 4 are around 90%. This indicates that Application Example 5 uses the carboxylated modified cellulose nanocrystal and sulfonated modified cellulose nanocrystal compound system from Example 5, combined with boronized polyisobutylene succinimide and branched polyether, to further improve the degreasing effect on the batch samples, thereby improving the degreasing quality and efficiency.

[0094] As can be seen from Application Examples 5-7 and Table 3, when the batch size reaches 300 samples, the pass rate of Application Example 7 reaches 99%, while the pass rates of Application Examples 5-6 are lower, such as 96.3% and 97% for Application Examples 5 and 6, respectively. This indicates that the compounding of N,N-dimethylphenylethylamine citrate and betaine citrate has a synergistic effect, and the combination with the stabilizing agent of this application has an enhanced effect, further improving the degreasing effect and quality, ensuring the surface uniformity of each non-conductive printed circuit board material after batch degreasing, and improving its pass rate after degreasing.

[0095] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An alkaline degreasing agent for non-conductive printed circuit board materials, characterized in that, Composed of the following raw materials: Alkali source: 70-90g / L Surfactant: 3-8 g / L Stabilizing agent: 5-12g / L Modified citrate: 1-8 g / L Antioxidant: 0.1-0.5 g / L The remainder is water; The stabilizing agent is composed of boronized polyisobutylene succinimide, branched polyether, and hydrophilic modified cellulose nanocrystals in a weight ratio of 1:(1-3):(3-5); The alkaline source is composed of sodium silicate, sodium hexametaphosphate, potassium hydroxide, trisodium phosphate, monoethanolamine, and sodium gluconate, wherein the potassium hydroxide content is >60 wt%. The surfactant is a fatty alcohol polyoxyethylene ether and / or an alkyl glycoside; The modified citrate is composed of N,N-dimethylphenylethylamine citrate and betaine citrate in a weight ratio of 1:2; The antioxidant is tea polyphenol; the hydrophilic modified cellulose nanocrystals are carboxylated modified cellulose nanocrystals and / or sulfonated modified cellulose nanocrystals.

2. The alkaline degreasing agent for non-conductive printed circuit board materials according to claim 1, characterized in that: The hydrophilic modified cellulose nanocrystals are composed of carboxylated modified cellulose nanocrystals and sulfonated modified cellulose nanocrystals.

3. A method for preparing an alkaline degreasing agent for a non-conductive printed circuit board material as described in claim 1 or 2, characterized in that, It is prepared by the following method: Weigh out the alkali source, surfactant, stabilizer, modified citrate, antioxidant, and water by weight percentage, mix them evenly, and obtain the alkaline degreasing agent.

4. The application of an alkaline degreasing agent, characterized in that: The alkaline degreasing agent of claim 1 or 2 is applied to degreasing non-conductive printed circuit board materials, wherein the degreasing temperature is 60°C and the degreasing time is 6-8 min.

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