A high-efficiency and environmentally friendly developer for PCB boards and its preparation process

Abstract

The invention discloses a kind of high-efficiency and environment-friendly developer for PCB board, and the developer includes the following components by mass: 60-100 parts of organic alkali composition; 30-80 parts of cosolvent; 30-70 parts of defoamer; 40-70 parts of surfactant; 20-50 parts of antioxidant; 15-45 parts of penetrant; 30-50 parts of buffer; 10-20 parts of inhibitor; The invention also discloses a preparation process of high-efficiency and environment-friendly developer for PCB board. The present invention develops PCB board by using organic alkali composition, fully dissolves dry film by ether group, hydroxyl group and amine group, avoids solid precipitation caused by traditional carbonate development, thereby effectively improving the efficiency and quality of PCB development process; penetrant and cosolvent are added at the same time, significantly improving the penetration and dissolution effect of developer on dry film, further improving development efficiency; and with the antioxidant, buffer etc. added therein, the antioxidant capacity of developer and PCB board can be improved, and the stability of developer during use is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of developer, and in particular to a high-efficiency and environment-friendly developer for PCB boards and a preparation process thereof. Background Art

[0002] PCB (Printed Circuit Board) is a provider of electrical connections for electronic components. It has a history of more than 100 years. The main advantage of using circuit boards is that they greatly reduce wiring and assembly errors, improve the level of automation and production labor rate, and have a vital strategic position and irreplaceable role in national economic construction, national defense construction and social development.

[0003] With the continuous development of integrated circuits, the surface wire spacing is getting narrower and narrower, which puts higher requirements on the width control of its wires. Development, as a key process in the PCB manufacturing process, directly affects the quality of the overall product. Dry film exposure and development is an important step in the PCB board manufacturing process. This step uses exposure and development to depict geometric structures on the PCB board. As the key dimensions continue to shrink, the requirements for the development process in PCB board manufacturing are also getting higher and higher. The importance of the development working fluid is increasingly valued with the advancement of the process. The dry film is a carboxyl-containing organic substance and also contains some metal ions (such as Ca 2+ and Mg 2+ ).

[0004] At present, many PCB manufacturers still use the traditional developing method, that is, using inorganic carbonates, such as sodium carbonate, potassium carbonate and other dilute solutions to develop at room temperature of about 30°C. The principle is to use carbonate to act on carboxyl groups to remove organic matter. The use of inorganic carbonates has the advantages of mature technology and low cost, but there are also many disadvantages, such as low developing accuracy, large amounts of residues and short service life of the bath solution. The reason is that carbonates are easy to react and produce precipitation (such as calcium carbonate and magnesium carbonate), which adheres to the board. The adhered area cannot be removed in the subsequent film removal and is regarded as a circuit (originally this area is not a circuit), causing a short circuit; not only does it affect the processing rate during the processing of large-scale batch PCB boards, but it also causes pollution to equipment such as circuit boards and industrial processing equipment.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes a high-efficiency and environmentally friendly developer for PCB boards and a preparation process thereof to overcome the above-mentioned technical problems existing in the existing related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] According to one aspect of the present invention, there is provided a highly efficient and environmentally friendly developer for a PCB board, the developer comprising the following components in parts by weight:

[0009] 60-100 parts of organic base composition;

[0010] 30-80 parts of cosolvent;

[0011] 30-70 parts of defoaming agent;

[0012] 40-70 parts of surfactant;

[0013] 20-50 parts of antioxidants;

[0014] Penetrant 25-45 parts;

[0015] 30-50 parts of buffer;

[0016] 10-30 parts of inhibitor.

[0017] Furthermore, the organic base composition includes diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0018] Furthermore, the co-solvent includes 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0019] Furthermore, the defoaming agent includes polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent includes the following steps:

[0020] Put polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stir the mixture and flush with nitrogen;

[0021] The three-necked flask is heated to 150-170° C. and maintained for 5-7 hours;

[0022] The three-necked flask is heated to 180-190° C. and maintained for 20-30 min;

[0023] Condensation collects the water precipitated in the three-necked flask and cools it to 40° C.

[0024] The defoaming agent is obtained by mixing ethanolamine with the cooled mixture.

[0025] Furthermore, the surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps:

[0026] Add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80°C and stir evenly;

[0027] Add dibutyltin diisocyanate to the mixed four-necked bottle, then dropwise add toluene diisocyanate, and stir again for 2-3 hours;

[0028] Add allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continue stirring to react for 2-3 hours;

[0029] The completely mixed four-necked bottle was cooled to 30° C., and distilled water was added and stirred for 0.5-1 h to obtain a nonionic polyurethane surfactant.

[0030] Furthermore, the antioxidant includes at least one of tea polyphenols, tocopherol, tert-butyl hydroxyanisole, dibutyl hydroxytoluene, tert-butyl hydroquinone and tert-butyl methylphenol.

[0031] Furthermore, the penetrant includes isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant includes the following steps:

[0032] Place isooctyl alcohol in a reaction kettle, add potassium hydroxide and start stirring, flush nitrogen into the reaction kettle and heat to 100°C;

[0033] The stirred reactor was placed in a vacuum environment at 100-110° C. for 20-30 min;

[0034] The reactor is heated to 150° C. and propylene oxide is introduced to react for 20-30 minutes;

[0035] After the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0036] The isooctyl alcohol polyether is placed in a reaction kettle and a sodium hydroxide solution is added, and propylene oxide is added again until the reaction is complete to obtain a penetrant.

[0037] Furthermore, the buffer is citric acid.

[0038] Furthermore, the inhibitor is one of potassium bromide, 6-nitrobenzimidazole nitrate and indolizine.

[0039] According to another aspect of the present invention, a process for preparing a high-efficiency and environmentally friendly developer for a PCB board is provided, the process comprising the following steps:

[0040] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40-50° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0041] S2, respectively selecting a certain amount of defoaming agent, surfactant and inhibitor and sequentially adding them to the first mixed solution, raising the water bath temperature to 60-70° C. and stirring sufficiently to obtain a second mixed solution;

[0042] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0043] The invention has the following beneficial effects: by using an organic alkali composition to develop a PCB board, the ether group, hydroxyl group and amine group are used to fully dissolve the dry film, and solid precipitation caused by traditional carbonate development is avoided, thereby effectively improving the efficiency and quality of the PCB development process; at the same time, a penetrant and a co-solvent are added to significantly improve the penetration and dissolution effect of the developer on the dry film, and further improve the development efficiency; and with the addition of an antioxidant, a buffer, etc., the antioxidant capacity of the developer and the PCB board can be improved, and the stability during wide application and long-term use can be guaranteed. At the same time, citric acid as a buffer can respond to diglycolamine, effectively maintain the stability of the pH value of the developer itself, and effectively maintain and improve the service life of the developer; in addition, by adding a polyether lipid defoamer, the polyether lipid is used to promote the dissolution of the developer and the dry film, and the generation of bubbles in the developer itself and the reaction process is effectively reduced, and the reaction efficiency is further improved; and the invention adopts a combination reaction of multiple organic substances, has the advantages of long life, high reaction rate, and no generation of harmful substances, has significant environmental protection performance, and reduces the cost and difficulty of PCB board production and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 The present invention is a flowchart of a process for preparing a highly efficient and environmentally friendly developer for PCB boards according to an embodiment of the present invention.

[0046] Figure 2 It is a comparison chart of the number of PCB boards treated with the developer prepared in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2 and Comparative Example 3 in the experimental group;

[0047] Figure 3It is a comparison chart of the average development time of the developers prepared in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2 and Comparative Example 3 in the experimental group. DETAILED DESCRIPTION

[0048] According to an embodiment of the present invention, a highly efficient and environmentally friendly developer for a PCB board and a preparation process thereof are provided.

[0049] Embodiment 1

[0050] A highly efficient and environmentally friendly developer for PCB boards, the developer comprising the following components in parts by weight:

[0051] 60 g of organic base composition;

[0052] Solvent 30;

[0053] Defoaming agent 30g;

[0054] Surfactant 40g;

[0055] Antioxidant 20g;

[0056] Penetrant 15g;

[0057] Buffer 30g;

[0058] Inhibitor 10g.

[0059] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0060] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0061] The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps:

[0062] S11, placing polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stirring the mixture and flushing with nitrogen;

[0063] S12, heating the three-necked flask to 150°C for 5 hours;

[0064] S13, heating the three-necked flask to 180°C and maintaining for 20 min;

[0065] S14, condense and collect the water precipitated in the three-necked flask and cool it to 40° C.;

[0066] S15, mixing ethanolamine with the cooled mixture to obtain a defoaming agent.

[0067] The surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps:

[0068] S21, add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80° C. and stir evenly;

[0069] S22, adding dibutyltin diisocyanate to the mixed four-necked bottle, and then dropping toluene diisocyanate, and stirring again for 2 hours;

[0070] S23, adding allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continuing to stir and react for 2 hours;

[0071] S24, cooling the completely mixed four-necked bottle to 30° C., adding distilled water and stirring for 0.5 to obtain a nonionic polyurethane surfactant.

[0072] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0073] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0074] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0075] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0076] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0077] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0078] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0079] The buffer is citric acid.

[0080] The inhibitor is potassium bromide.

[0081] The above raw materials in mass fractions are selected to prepare a developer according to a preparation process of a high-efficiency and environmentally friendly developer for PCB boards, such as Figure 1 As shown, the process includes the following steps:

[0082] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0083] S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60°C and stir thoroughly to obtain a second mixed solution;

[0084] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0085] Embodiment 2

[0086] A highly efficient and environmentally friendly developer for PCB boards, the developer comprising the following components in parts by weight:

[0087] 75 g of organic base composition;

[0088] Solvent 45g;

[0089] Defoaming agent 50g;

[0090] Surfactant 55g;

[0091] Antioxidant 30g;

[0092] Penetrant 25g;

[0093] Buffer 35g;

[0094] Inhibitor 14g.

[0095] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0096] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0097] The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps:

[0098] S11, placing polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stirring the mixture and flushing with nitrogen;

[0099] S12, heating the three-necked flask to 150°C for 5 hours;

[0100] S13, heating the three-necked flask to 180°C and maintaining for 20 min;

[0101] S14, condense and collect the water precipitated in the three-necked flask and cool it to 40° C.;

[0102] S15, mixing ethanolamine with the cooled mixture to obtain a defoaming agent.

[0103] The surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps:

[0104] S21, add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80° C. and stir evenly;

[0105] S22, adding dibutyltin diisocyanate to the mixed four-necked bottle, and then dropping toluene diisocyanate, and stirring again for 2 hours;

[0106] S23, adding allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continuing to stir and react for 2 hours;

[0107] S24, cooling the completely mixed four-necked bottle to 30° C., adding distilled water and stirring for 0.5 to obtain a nonionic polyurethane surfactant.

[0108] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0109] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0110] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0111] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0112] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0113] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0114] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0115] The buffer is citric acid.

[0116] The inhibitor is potassium bromide.

[0117] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0118] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0119] S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60°C and stir thoroughly to obtain a second mixed solution;

[0120] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0121] Embodiment 3

[0122] A highly efficient and environmentally friendly developer for PCB boards, the developer comprising the following components in parts by weight:

[0123] 85 g of organic base composition;

[0124] Solvent 65g;

[0125] Defoaming agent 60g;

[0126] Surfactant 60g;

[0127] Antioxidant 40g;

[0128] Penetrant 35g;

[0129] Buffer 45g;

[0130] Inhibitor 18g.

[0131] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0132] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0133] The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps:

[0134] S11, placing polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stirring the mixture and flushing with nitrogen;

[0135] S12, heating the three-necked flask to 150°C for 5 hours;

[0136] S13, heating the three-necked flask to 180°C and maintaining for 20 min;

[0137] S14, condensing and collecting the water precipitated in the three-necked flask and cooling it to 40° C.;

[0138] S15, mixing ethanolamine with the cooled mixture to obtain a defoaming agent.

[0139] The surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps:

[0140] S21, add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80° C. and stir evenly;

[0141] S22, adding dibutyltin diisocyanate to the mixed four-necked bottle, and then dropping toluene diisocyanate, and stirring again for 2 hours;

[0142] S23, adding allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continuing to stir and react for 2 hours;

[0143] S24, cooling the completely mixed four-necked bottle to 30° C., adding distilled water and stirring for 0.5 to obtain a nonionic polyurethane surfactant.

[0144] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0145] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0146] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0147] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0148] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0149] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0150] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0151] The buffer is citric acid.

[0152] The inhibitor is potassium bromide.

[0153] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0154] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0155] S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60°C and stir thoroughly to obtain a second mixed solution;

[0156] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0157] Embodiment 4

[0158] A highly efficient and environmentally friendly developer for PCB boards, the developer comprising the following components in parts by weight:

[0159] Organic base composition 100g;

[0160] Solvent 80g;

[0161] Defoaming agent 70g;

[0162] Surfactant 70g;

[0163] Antioxidant 50g;

[0164] Penetrant 45g;

[0165] Buffer 50g;

[0166] Inhibitor 20g.

[0167] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0168] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0169] The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps:

[0170] S11, placing polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stirring the mixture and flushing with nitrogen;

[0171] S12, heating the three-necked flask to 150°C for 5 hours;

[0172] S13, heating the three-necked flask to 180°C and maintaining for 20 min;

[0173] S14, condensing and collecting the water precipitated in the three-necked flask and cooling it to 40° C.;

[0174] S15, mixing ethanolamine with the cooled mixture to obtain a defoaming agent.

[0175] The surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps:

[0176] S21, add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80° C. and stir evenly;

[0177] S22, adding dibutyltin diisocyanate to the mixed four-necked bottle, and then dropping toluene diisocyanate, and stirring again for 2 hours;

[0178] S23, adding allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continuing to stir and react for 2 hours;

[0179] S24, cooling the completely mixed four-necked bottle to 30° C., adding distilled water and stirring for 0.5 to obtain a nonionic polyurethane surfactant.

[0180] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0181] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0182] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0183] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0184] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0185] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0186] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0187] The buffer is citric acid.

[0188] The inhibitor is potassium bromide.

[0189] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0190] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0191] S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60°C and stir thoroughly to obtain a second mixed solution;

[0192] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0193] Comparative Example 1

[0194] The developer comprises the following components in parts by weight:

[0195] 85 g of organic base composition;

[0196] Solvent 65g;

[0197] Defoaming agent 60g;

[0198] Surfactant 60g;

[0199] Antioxidant 40g;

[0200] Penetrant 35g;

[0201] Buffer 45g;

[0202] Inhibitor 18g.

[0203] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0204] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0205] The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps:

[0206] S11, placing polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stirring the mixture and flushing with nitrogen;

[0207] S12, heating the three-necked flask to 150°C for 5 hours;

[0208] S13, heating the three-necked flask to 180°C and maintaining for 20 min;

[0209] S14, condense and collect the water precipitated in the three-necked flask and cool it to 40° C.;

[0210] S15, mixing ethanolamine with the cooled mixture to obtain a defoaming agent.

[0211] The surfactant is fatty alcohol polyoxyethylene ether.

[0212] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0213] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0214] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0215] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0216] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0217] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0218] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0219] The buffer is citric acid.

[0220] The inhibitor is potassium bromide.

[0221] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0222] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0223] S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60°C and stir thoroughly to obtain a second mixed solution;

[0224] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0225] Comparative Example 2

[0226] The developer comprises the following components in parts by weight:

[0227] 85 g of organic base composition;

[0228] Solvent 65g;

[0229] Surfactant 60g;

[0230] Antioxidant 40g;

[0231] Penetrant 35g;

[0232] Buffer 45g;

[0233] Inhibitor 18g.

[0234] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0235] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0236] The surfactant is fatty alcohol polyoxyethylene ether.

[0237] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0238] The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps:

[0239] S31, placing isooctyl alcohol in a reaction kettle, adding potassium hydroxide and starting stirring, flushing nitrogen into the reaction kettle and heating to 100° C.;

[0240] S32, placing the reactor after stirring in a vacuum environment at 100° C. for 20 min;

[0241] S33, heating the reactor to 150° C. and introducing propylene oxide to react for 20 min;

[0242] S34, after the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether;

[0243] S35, placing the isooctyl alcohol polyether in a reaction kettle and adding sodium hydroxide solution, and then adding propylene oxide again until the reaction is complete to obtain a penetrant.

[0244] The buffer is citric acid.

[0245] The inhibitor is potassium bromide.

[0246] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0247] S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0248] S2, respectively selecting a certain amount of surfactant and inhibitor and sequentially adding them to the first mixed solution, raising the water bath temperature to 60°C and stirring thoroughly to obtain a second mixed solution;

[0249] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0250] Comparative Example 3

[0251] The developer comprises the following components in parts by weight:

[0252] 85 g of organic base composition;

[0253] Solvent 65g;

[0254] Surfactant 60g;

[0255] Antioxidant 40g;

[0256] Penetrant 35g;

[0257] Inhibitor 18g.

[0258] The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:1.

[0259] The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:5.

[0260] The surfactant is fatty alcohol polyoxyethylene ether.

[0261] The antioxidants include tea polyphenols and butylated hydroxyanisole.

[0262] The penetrant is a condensate of polyoxyethylene and higher fatty alcohol.

[0263] The inhibitor is potassium bromide.

[0264] The above raw materials in parts by mass are selected to prepare a developer according to a process for preparing a high-efficiency and environmentally friendly developer for PCB boards, the process comprising the following steps:

[0265] S1. Select a certain amount of organic base composition, co-solvent, antioxidant and penetrant respectively, place them in deionized water, maintain the temperature at 40° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution;

[0266] S2, respectively selecting a certain amount of surfactant and inhibitor and sequentially adding them to the first mixed solution, raising the water bath temperature to 60°C and stirring thoroughly to obtain a second mixed solution;

[0267] S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

[0268] Experimental Group

[0269] The developer solutions prepared in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2 and Comparative Example 3 were selected and placed in a container. PCB boards of the same specification were added to perform a developing reaction. The experimental phenomena were observed and the experimental data were recorded. The experimental results are shown in Table 1 and Figure 2 , Figure 3 As shown;

[0270] Table 1: Comparison of developer performance in various examples and comparative examples

[0271] Number of PCB boards disposed (pcs) Average appearance time (s) Amount of foam in container PCB board qualification rate (%) Embodiment 1 70 38 Small amount 97.3 Embodiment 2 72 35 Small amount 97.8 Embodiment 3 77 32 Very small amount 98.1 Embodiment 4 80 29 Very small amount 98.2 Comparative Example 1 67 50 less 92.3 Comparative Example 2 55 64 More 90.3 Comparative Example 3 48 78 More 87.6

[0272] As can be seen from Table 1, the developer prepared by the present invention has the functional advantages of efficient and rapid development, and according to the addition of the defoaming agent therein, the bubble problem existing in the traditional development process is effectively improved, the processing quantity and qualified rate of PCBs are significantly improved, and the edible life of the developer itself is increased.

[0273] In summary, with the aid of the above technical scheme of the present invention, the PCB board is developed by using an organic alkali composition, and the dry film is fully dissolved by using ether groups, hydroxyl groups and amine groups, thereby avoiding solid precipitation caused by traditional carbonate development, thereby effectively improving the efficiency and quality of the PCB development process; at the same time, penetrants and co-solvents are added to significantly improve the penetration and dissolution of the developer on the dry film, further improving the development efficiency; and with the addition of antioxidants, buffers, etc., the antioxidant capacity of the developer and the PCB board can be improved, ensuring the stability during wide application and long-term use. At the same time, citric acid as a buffer can respond to diglycolamine to effectively maintain the stability of the pH value of the developer itself, and effectively maintain and improve the service life of the developer; in addition, by adding a polyether lipid defoamer, the polyether lipid is used to promote the dissolution of the developer and the dry film, while effectively reducing the generation of bubbles in the developer itself and the reaction process, further improving the efficiency of the reaction; and the present invention adopts a combination reaction of multiple organic substances, has the advantages of long life, high reaction rate, and no harmful substances, has significant environmental protection performance, and reduces the cost and difficulty of PCB production and processing.

[0274] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly efficient and environmentally friendly developer for PCB boards, characterized in that: The developer comprises the following components in parts by weight: 60-100 parts of organic base composition; 30-80 parts of cosolvent; 30-70 parts of defoaming agent; 40-70 parts of surfactant; 20-50 parts of antioxidants; 15-45 parts of penetrant; 30-50 parts of buffer; 10-20 parts of inhibitor; The organic base composition comprises diglycolamine, diethanolamine and polyethylene polyamine in a mass ratio of 2:1:

1.

2. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The co-solvent comprises 1-methyl-pyrrolidone and isopropyl ketone in a mass ratio of 1:

5.

3. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The defoaming agent comprises polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid, p-toluenesulfonic acid and ethanolamine, and the preparation method of the defoaming agent comprises the following steps: Put polypropylene glycol, polyethylene glycol, dibasic acid, fatty acid and p-toluenesulfonic acid into a three-necked bottle equipped with a stirrer and a nitrogen interface, stir the mixture and flush with nitrogen; The three-necked flask is heated to 150-170° C. and maintained for 5-7 hours; The three-necked flask is heated to 180-190° C. and maintained for 20-30 min; Condensation collects the water precipitated in the three-necked flask and cools it to 40° C. The defoaming agent is obtained by mixing ethanolamine with the cooled mixture.

4. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The surfactant is a nonionic polyurethane surfactant, and the preparation method of the surfactant comprises the following steps: Add polyether diol to a four-necked flask equipped with a stirrer and a thermometer, heat to 80°C and stir evenly; Add dibutyltin diisocyanate to the mixed four-necked bottle, then dropwise add toluene diisocyanate, and stir again for 2-3 hours; Add allyl alcohol polyoxyalkyl ether to the four-necked flask again, and continue stirring to react for 2-3 hours; The completely mixed four-necked bottle was cooled to 30° C., and distilled water was added and stirred for 0.5-1 h to obtain a nonionic polyurethane surfactant.

5. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The antioxidant includes at least one of tea polyphenols, tocopherol, tert-butyl hydroxyanisole, dibutyl hydroxytoluene, tert-butyl hydroquinone and tert-butyl methylphenol.

6. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The penetrant comprises isooctyl alcohol, propylene oxide and ethylene oxide in a mass ratio of 1:1:10, and the preparation method of the penetrant comprises the following steps: Place isooctyl alcohol in a reaction kettle, add potassium hydroxide and start stirring, flush nitrogen into the reaction kettle and heat to 100°C; The stirred reactor was placed in a vacuum environment at 100-110° C. for 20-30 min; The reactor is heated to 150° C. and propylene oxide is introduced to react for 20-30 minutes; After the reaction is completed, ethylene oxide is introduced into the reactor, and after reacting for 200 minutes, the temperature is lowered and the material is discharged to obtain isooctyl alcohol polyether; The isooctyl alcohol polyether is placed in a reaction kettle and a sodium hydroxide solution is added, and propylene oxide is added again until the reaction is complete to obtain a penetrant.

7. The high-efficiency and environment-friendly developer for PCB according to claim 1, characterized in that: The buffer is citric acid.

8. The high-efficiency and environment-friendly developer for PCB boards according to claim 1, characterized in that: The inhibitor is one of potassium bromide, 6-nitrobenzimidazole nitrate and indolizine.

9. A process for preparing a high-efficiency and environment-friendly developer for PCB boards, used for preparing the high-efficiency and environment-friendly developer for PCB boards as claimed in any one of claims 1 to 8, characterized in that: The process includes the following steps: S1. Select a certain amount of organic base composition, cosolvent, antioxidant, penetrant and buffer respectively, place them in deionized water, maintain the temperature at 40-50° C. using a water bath method, and stir them thoroughly to obtain a first mixed solution; S2, respectively select a certain amount of defoaming agent, surfactant and inhibitor and add them to the first mixed solution in sequence, raise the water bath temperature to 60-70° C. and stir thoroughly to obtain a second mixed solution; S3, cooling the second mixed solution after the reaction to room temperature to obtain a developer.

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