A bulking agent and preparation method thereof

Abstract

The present application relates to the field of circuit board processing technology, and more specifically, it relates to a bulking treatment agent and a preparation method thereof. It is composed of the following raw materials in parts by weight: 38-46% organic solvent, 1-5% alkaline regulator, 0.1-0.5 parts stabilizer, 10-17% bulking activation liquid, and the balance is water; the bulking activation liquid is prepared by active group betaine derivatives, solutions of unsaturated polycarboxylic acid polymers, porous silica aerogels, thixotropic agents, propylene glycol methyl ether acetate, and initiators. The bulking activator prepared by active group betaine derivatives, solutions of unsaturated polycarboxylic acid polymers, porous silica aerogels, thixotropic agents, propylene glycol methyl ether acetate, and initiators plays a better bulking and activation role, and cooperates with organic solvents, alkaline regulators, etc., so that the obtained bulking treatment agent is used for bulking treatment, and can reach the best bulking and activation effect in a shorter time, and improve the qualified rate after degumming.

Description

Technical Field

[0001] The present application relates to the field of circuit board processing technology, and more specifically, to a bulking treatment agent and a preparation method thereof. Background Art

[0002] Circuit boards are usually produced in a straight line, horizontal line and vertical continuous manner. With the advancement of technology, the degree of automation of circuit boards is getting higher and higher, and the production efficiency is also getting higher and higher. The production process of circuit boards mainly includes: bulking-debonding-neutralization-hole filling-micro-etching-pre-preg-activation-reduction-copperization. With the development of direct electroplating technology and horizontal chemical copper plating technology, the time of each process is greatly shortened, and the total process time can be controlled within 1-10 minutes. Achieving better processing results under the time of each process has become a new challenge.

[0003] Bulking is the first process in the production of circuit boards. During the manufacturing process, the substrate resin of the circuit board needs to be drilled. The high temperature generated during the drilling process causes the resin at the hole position to melt and easily adhere to the hole wall, forming glue residue after cooling. At the same time, this process will also produce stains. If bulking is not performed before removing the glue residue, the effect of removing the glue residue will be reduced, which will cause the drilling stain in the hole to be incompletely removed or over-etched, thereby reducing the effect of removing the glue residue, increasing the probability of producing defective products, and affecting the subsequent chemical copper deposition effect.

[0004] In the bulking process, the vertical chemical copper deposition method requires 5-7 minutes, while the horizontal chemical copper deposition method requires 60-180 seconds; in the degumming process, the vertical chemical copper deposition method requires 10-15 minutes, while the horizontal chemical copper deposition method requires 180-300 seconds. At present, the bulking agent mainly uses organic solvents, alkaline substances, and surfactants. By using the principle of similar compatibility in an alkaline environment, the bulking of the glue residue is achieved, which is beneficial to the subsequent degumming process.

[0005] However, as the processing time is shortened, the current leavening agent has a poor leavening effect when processing large quantities of circuit boards, and after subsequent degumming, the circuit boards are still not completely removed or over-etched, which requires further research. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a bulking agent and a preparation method thereof.

[0007] In a first aspect, the present application provides a bulking agent, which is composed of the following raw materials in parts by weight:

[0008] Organic solvent 38-46%

[0009] Alkaline regulator 1-5%

[0010] Stabilizer 0.1-0.5 parts

[0011] 10-17% bulking agent

[0012] The balance is water;

[0013] The bulking activation solution is prepared from active group betaine derivatives, unsaturated polycarboxylic acid polymer solution, porous silica aerogel, thixotropic agent, propylene glycol methyl ether acetate and initiator.

[0014] In the above technical solution, the active group betaine derivative has the characteristics of an amphoteric surfactant, which has better dispersibility and wetting agent properties. The active group contained can further react with the solution of the unsaturated polycarboxylic acid polymer under the action of the initiator to form a reaction substance that can improve the dispersibility, thixotropy, and anti-sagging properties of the porous silica aerogel. The solution of the unsaturated polycarboxylic acid polymer is a wetting and dispersing agent that builds bridges between the porous silica aerogels to form a three-dimensional network structure, and cooperates with the active group betaine derivative to reduce the sedimentation and sagging of the porous silica aerogel.

[0015] The chemical composition of the solution of the unsaturated polycarboxylic acid polymer is a solution of a low molecular weight unsaturated polycarboxylic acid polymer, and its acid value is preferably 180 mgKOH / g, and the non-volatile matter (10 min, 150° C.) is 50%. The manufacturer in this embodiment is preferably Sichuan Ruikaibang Chemical Materials Co., Ltd., and the model wetting dispersant is P104-1.

[0016] The thixotropic agent plays a thixotropic role, and cooperates with the active group betaine derivative and the solution of unsaturated polycarboxylic acid polymer to make the porous silica aerogel easy to thixotropic in the raw material system of the bulking treatment agent, and disperse evenly without settling or hanging.

[0017] Propylene glycol methyl ether acetate has a good solubility for both polar and non-polar substances, and can promote the dissolution of glue residue. It also acts as a diluting bulking activator, and interacts with active group betaine derivatives, unsaturated polycarboxylic acid polymer solutions, porous silica aerogels, and thixotropic agents to achieve a better bulking effect, so that the circuit board treated with the bulking agent has a better bulking effect, thereby improving the qualified rate of the circuit board after de-glueing.

[0018] The present application adopts organic solvent, alkaline regulator and stabilizer as specific components, and has the effect of bulking the slag; and the bulking activator prepared by active group betaine derivative, solution of unsaturated polycarboxylic acid polymer, porous silica aerogel, thixotropic agent, propylene glycol methyl ether acetate and initiator has better bulking effect, and has a synergistic effect with organic solvent, alkaline regulator and stabilizer, so that when it is used in the bulking process, it has better bulking effect.

[0019] Specifically, the porous silica aerogel has a nanoporous structure, low density and extremely low thermal conductivity. Therefore, with the cooperation of active group betaine derivatives, unsaturated polycarboxylic acid polymer solutions, thixotropic agents and propylene glycol methyl ether acetate, it is easy to disperse evenly in the bulking agent and is not prone to sedimentation, sagging and the like. At the same time, the extremely low thermal conductivity can avoid generating a large amount of heat during the bulking process and affecting the stability of the bulking agent.

[0020] Therefore, when the bulking agent obtained in the present application is used in the bulking process, since the circuit board production line is an automated process, when the bulking process is carried out, the circuit boards are sequentially transferred to the tank containing the bulking agent for immersion, and the process is carried out continuously. Therefore, in this process, the porous silica aerogel of the bulking agent is easily rubbed with the glue residue on the circuit board due to the thixotropic effect, thereby promoting the glue residue and falling off.

[0021] In addition, under the synergistic effect of active group betaine derivatives, unsaturated polycarboxylic acid polymer solutions, thixotropic agents, and propylene glycol methyl ether acetate, the glue residue is further promoted to be bulked or fall off. At the same time, the porous silica aerogel can also adsorb the fallen glue residue or other impurities to avoid re-contamination of the circuit board surface or reduce the pollutants on the circuit board surface, which is convenient for subsequent glue removal and improves the qualified rate of the circuit board after glue removal.

[0022] During the bulking process, due to the interaction between the active group betaine derivative, the solution of unsaturated polycarboxylic acid polymer and the thixotropic agent, it plays a better role in anti-sagging, anti-settling and thixotropy, which can prevent the porous silica aerogel from being adsorbed on the circuit board, and at the same time promote its contact with the glue residue, thereby generating friction, and then promoting the removal of the glue residue or bulking.

[0023] In summary, the present application adopts the bulking activator prepared by using active group betaine derivatives, solutions of unsaturated polycarboxylic acid polymers, porous silica aerogel, thixotropic agent, propylene glycol methyl ether acetate, and initiator to achieve better bulking and activation effects, and is combined with organic solvents, alkaline regulators, and stabilizers to make the obtained bulking treatment agent have better bulking and activation effects. Therefore, when used for bulking treatment, it can achieve the best bulking and activation effects in a shorter time, improve the qualified rate after degumming, reduce the over-corrosion of circuit boards after degumming, and improve the degumming quality of circuit boards.

[0024] When the bulking agent of the present application is used, the temperature is 30°C, the treatment is carried out for 60 seconds, and then the degumming process is carried out, and the qualified rate of the obtained circuit board reaches more than 95%, thereby effectively shortening the processing time of the circuit board and improving the processing efficiency.

[0025] Preferably, the weight ratio of the active group betaine derivative, the solution of unsaturated polycarboxylic acid polymer, porous silica aerogel, thixotropic agent, initiator and propylene glycol methyl ether acetate is (2-5): (1-3): (10-20): (0.3-0.8): (12-20): 0.1.

[0026] When the raw materials are used in the above weight ratio, the bulking agent can achieve a better bulking and activating effect.

[0027] Preferably, the porous silica aerogel has a particle size of 100-300 nm.

[0028] The above particle size range makes it easy for the porous silica aerogel to be dispersed in the bulking agent, and combined with the active group betaine derivative, the solution of the unsaturated polycarboxylic acid polymer, the thixotropic agent, and propylene glycol methyl ether acetate, the obtained bulking agent has better bulking and activation effects.

[0029] Preferably, the active group betaine derivative is methacryloylethyl sulfobetaine and / or hexadecanoylamidopropyl hydroxypropyl sulfobetaine.

[0030] Methacryloylethyl sulfobetaine and / or hexadecanoylamidopropyl hydroxypropyl sulfobetaine both contain active groups, which can further react with the solution of unsaturated polycarboxylic acid polymer under the action of initiator, and the formed reactants can further promote the dispersion, rheology, anti-sedimentation and anti-sagging effects of porous silica aerogel, and interact with thixotropic agent and propylene glycol methyl ether acetate, so that the prepared bulking activation liquid has better bulking and activation effects, thereby promoting the bulking effect of bulking treatment agent, so that after the circuit board goes through the bulking process, its glue residue can be quickly bulked, which is beneficial to improve the qualified rate of the circuit board after degumming.

[0031] Preferably, the weight ratio of the acryloylethyl sulfobetaine to the hexadecanoylamidopropyl hydroxypropyl sulfobetaine is (1-2):1.

[0032] When acryloylethyl sulfobetaine and hexadecanoylamidopropyl hydroxypropyl sulfobetaine act synergistically, the bulking and activating liquid has better bulking and activating effects, can quickly bulk the circuit board, and obtain a higher qualified rate of the circuit board after degumming.

[0033] Preferably, the thixotropic agent is one or more of polyamide-modified hydrogenated castor oil derivatives, modified polyurea, and high molecular polymers containing amino groups and acid groups.

[0034] The high molecular polymer containing amino groups and acid groups is a high molecular polymer rheology control agent containing amino groups and acid groups, and its brand model is preferably Lubrizol SOLTHIX 250; the high molecular polymer containing amino groups and acid groups has anti-settling and anti-sagging effects, and its active content is preferably 53%.

[0035] Polyamide modified hydrogenated castor oil derivatives, the brand model of which is preferably Arkema CRAYVALLAC MT, have thixotropic, anti-settling, anti-sagging and other effects. Modified polyurea is a modified polyurea anti-settling agent, the brand model of which is preferably French Pioneer -THIX 905S is a polymer thickener with anti-settling and anti-sagging properties. Its active content is preferably 53%.

[0036] Therefore, by using one or more of the above thixotropic agents, combined with active group betaine derivatives and unsaturated polycarboxylic acid polymer solutions, the thixotropic, rheological, anti-settling, and anti-sagging effects of the porous silica aerogel are better, and with the auxiliary effect of propylene glycol methyl ether acetate, the obtained bulking active agent has better bulking and activation effects.

[0037] The obtained bulking agent has better bulking effect, and can quickly play a better bulking and activating role in a shorter time, which is beneficial to the subsequent degumming and improves the qualified rate of the circuit board after degumming.

[0038] Preferably, the weight ratio of the polyamide-modified hydrogenated castor oil derivative, the modified polyurea, and the high molecular polymer containing amino groups and acid groups is 1:(1-2):(1-3).

[0039] When polyamide-modified hydrogenated castor oil derivatives, modified polyurea, and high molecular polymers containing amino groups and acid groups are compounded, a synergistic effect is achieved. In combination with active group betaine derivatives, unsaturated polycarboxylic acid polymer solutions, porous silica aerogels, and propylene glycol methyl ether acetate, a better swelling and activation enhancement effect is achieved. Therefore, the circuit board can be expanded in a shorter time, and after the glue is removed, a circuit board with a higher pass rate is obtained.

[0040] Preferably, the alkaline regulator is one or more of sodium hydroxide, potassium hydroxide, and sodium carbonate; and the stabilizer is sodium hexametasulfate.

[0041] Sodium hydroxide, potassium hydroxide and sodium carbonate play the role of adjusting alkalinity and promoting the bulking of the rubber residue, while sodium hexametasulfate can promote the stability of alkalinity to ensure the alkalinity stability of the bulking agent.

[0042] Preferably, the organic solvent is dimethylformamide and / or diethyl ethanol monobutyl ether.

[0043] Dimethylformamide and diethyl ethanol monobutyl ether are both commonly used bulking solvents, which play a role in promoting the dissolution and bulking of the glue residue. In combination with the bulking activation liquid, the bulking treatment agent can obtain better bulking and activation effects, thereby improving the qualified rate of the circuit board after bulking and degumming.

[0044] In a second aspect, the present application provides a method for preparing a bulking agent, which is prepared by the following method:

[0045] According to weight, the active group betaine derivative, the solution of the unsaturated polycarboxylic acid polymer, the thixotropic agent, propylene glycol methyl ether acetate, and the initiator are weighed and mixed evenly, heated to 63-68° C., reacted for 1-2 hours, and then the porous silica aerogel is added and mixed evenly to obtain a bulking activation solution;

[0046] According to parts by weight, an organic solvent, an alkaline regulator, a stabilizer, a bulking activating liquid and water are weighed and mixed evenly to obtain a bulking treatment agent.

[0047] The active group betaine derivative, the solution of unsaturated polycarboxylic acid polymer, thixotropic agent, propylene glycol methyl ether acetate and initiator are compounded, and under heating conditions, the active group betaine derivative and the solution of unsaturated polycarboxylic acid polymer are further reacted, and other substances are combined to make the porous silica aerogel uniformly dispersed in the raw material embodiment of the bulking treatment agent, and organic solvent, alkaline regulator and stabilizer are combined to play a better bulking and activation role, provide the treatment effect of the bulking treatment agent, and after degumming, reduce the residual glue, impurities or over-etching of the circuit board, and improve the qualified rate of the circuit board.

[0048] In summary, this application has the following beneficial effects:

[0049] The present application adopts a bulking activator prepared by using active group betaine derivatives, a solution of unsaturated polycarboxylic acid polymer, porous silica aerogel, a thixotropic agent, propylene glycol methyl ether acetate, and an initiator to achieve better bulking and activation effects, and is combined with an organic solvent, an alkaline regulator, and a stabilizer to make the obtained bulking treatment agent have better bulking and activation effects. Therefore, when used for bulking treatment, it can achieve the best bulking and activation effects in a shorter time, thereby improving the qualified rate after degumming. DETAILED DESCRIPTION

[0050] The present application is further described in detail below in conjunction with embodiments.

[0051] Example

[0052] Example 1

[0053] A preparation of a bulking agent is prepared by the following method:

[0054] Weigh 5 kg of active group betaine derivative, 3 kg of unsaturated polycarboxylic acid polymer solution, 20 kg of propylene glycol methyl ether acetate, and 0.01 kg of azobisisobutyronitrile, mix them evenly, heat to 68 ° C, react for 2 hours, then add 20 kg of porous silica aerogel with an average particle size of 100 nm and 0.8 kg of thixotropic agent, mix evenly, and obtain a bulking activation solution;

[0055] 38 kg of organic solvent, 1 kg of alkaline regulator, 0.1 kg of stabilizer, 17 kg of bulking activating liquid and 43.9 kg of water were weighed and mixed evenly to obtain a bulking treatment agent.

[0056] Example 2

[0057] The difference between Example 2 and Example 1 is that the amount of the bulking agent raw materials is different, specifically as follows: 42 kg of organic solvent, 3 kg of alkaline regulator, 0.3 kg of stabilizer, 15% bulking activation liquid, and 39.7 kg of water are mixed evenly to obtain the bulking agent.

[0058] The organic solvent is composed of 30 kg of dimethylformamide and 12 kg of diethyl ethanol monobutyl ether; the alkaline regulator is composed of 2 kg of sodium hydroxide and 1 kg of sodium carbonate; and the stabilizer is sodium hexametasulfate.

[0059] Example 3

[0060] The difference between Example 3 and Example 1 is that the amount of the bulking agent raw materials is different, specifically as follows: 46 kg of organic solvent, 5 kg of alkaline regulator, 0.5 kg of stabilizer, 10% bulking activation liquid, and 38.5 kg of water are mixed evenly to obtain the bulking agent.

[0061] The organic solvent is composed of diethyl ethanol monobutyl ether; the alkaline regulator is potassium hydroxide; and the stabilizer is sodium hexametasulfate.

[0062] Example 4

[0063] The difference between Example 4 and Example 2 is that the amount of bulking activation liquid and the process conditions are different, as follows:

[0064] Weigh 3kg of active group betaine derivative, 2kg of unsaturated polycarboxylic acid polymer solution, 18kg of propylene glycol methyl ether acetate, and 0.01kg of azobisisobutyronitrile, mix them evenly, heat to 65°C, react for 1.5h, then add 15kg of porous silica aerogel with an average particle size of 250nm and 0.5kg of thixotropic agent, mix evenly, and obtain a bulking activation solution.

[0065] Example 5

[0066] The difference between Example 5 and Example 2 is that the amount of bulking activation liquid and the process conditions are different, as follows:

[0067] Weigh 2 kg of active group betaine derivative, 1 kg of unsaturated polycarboxylic acid polymer solution, 12 kg of propylene glycol methyl ether acetate, and 0.01 kg of azobisisobutyronitrile, mix them evenly, heat to 63 ° C, react for 2 hours, then add 10 kg of porous silica aerogel with an average particle size of 300 nm and 0.3 kg of thixotropic agent, mix evenly, and obtain a bulking activation solution.

[0068] Example 6

[0069] The difference between Example 6 and Example 4 is that the active group betaine derivative is hexadecanoylamidopropyl hydroxypropyl sulfobetaine.

[0070] Example 7

[0071] The difference between Example 7 and Example 4 is that the active group betaine derivative consists of 2 kg of methacryloylethyl sulfobetaine and 1 kg of hexadecanoylamidopropyl hydroxypropyl sulfobetaine.

[0072] Example 8

[0073] The difference between Example 8 and Example 4 is that the active group betaine derivative consists of 1.5 kg of methacryloylethyl sulfobetaine and 1.5 kg of hexadecanoylamidopropyl hydroxypropyl sulfobetaine.

[0074] Example 9

[0075] The difference between Example 9 and Example 7 is that the thixotropic agent is modified polyurea.

[0076] Example 10

[0077] The difference between Example 10 and Example 7 is that the thixotropic agent is a high molecular polymer containing amino groups and acid groups.

[0078] Embodiment 11

[0079] The difference between Example 11 and Example 7 is that the thixotropic agent consists of 0.3 kg of polyamide-modified hydrogenated castor oil derivative and 0.2 kg of modified polyurea.

[0080] Example 12

[0081] The difference between Example 12 and Example 7 is that the thixotropic agent is composed of 0.3 kg of modified polyurea and 0.2 kg of a high molecular polymer containing amino groups and acid groups.

[0082] Example 13

[0083] The difference between Example 13 and Example 7 is that the thixotropic agent is composed of 0.2 kg of polyamide-modified hydrogenated castor oil derivative and 0.3 kg of high molecular polymer containing amino groups and acid groups.

[0084] Embodiment 14

[0085] The difference between Example 14 and Example 7 is that the thixotropic agent is composed of 0.1 kg of amide-modified hydrogenated castor oil derivative, 0.2 kg of modified polyurea, and 0.2 kg of high molecular polymer containing amino groups and acid groups.

[0086] Embodiment 15

[0087] The difference between Example 15 and Example 7 is that the thixotropic agent is composed of 0.1 kg of amide-modified hydrogenated castor oil derivative, 0.1 kg of modified polyurea, and 0.3 kg of high molecular polymer containing amino groups and acid groups.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that the leavening activation liquid is replaced by surfactant OP-10 in equal amount.

[0091] Comparative Example 2

[0092] The difference between Comparative Example 2 and Example 1 is that the active group betaine derivative is replaced by an equal amount of a solution of an unsaturated polycarboxylic acid polymer.

[0093] Comparative Example 3

[0094] The difference between Comparative Example 3 and Example 1 is that the porous silica aerogel is replaced by silica in an equal amount.

[0095] Comparative Example 4

[0096] The difference between Comparative Example 4 and Example 1 is that the thixotropic agent is replaced by an active group betaine derivative in equal amounts.

[0097] Comparative Example 5

[0098] The difference between Comparative Example 5 and Example 1 is that the porous silica aerogel is replaced by an active group betaine derivative in equal amounts.

[0099] Comparative Example 6

[0100] The difference between Comparative Example 6 and Example 1 is that the solution of the unsaturated polycarboxylic acid polymer is replaced by an active group betaine derivative in equal amounts.

[0101] Comparative Example 7

[0102] The difference between Comparative Example 7 and Example 1 is that the particle size of the porous silica aerogel is 1 micron.

[0103] Performance testing

[0104] Detection method / test method

[0105] 500 PCB substrates made of epoxy resin with a thickness of 1 mm and holes drilled therein were subjected to a horizontal chemical copper deposition process. The conveying rate of the PCB substrates was 2 m / min. The bulking agents obtained in Examples 1-17 and Comparative Examples 1-7 were completely immersed in the PCB substrates for bulking treatment. After the substrates were taken out, the debonding treatment was performed. The following treatment conditions were respectively as follows:

[0106] Condition 1: The bulking treatment temperature is 30°C and the treatment time is 60s; the degumming treatment temperature is 60°C and the treatment time is 180s.

[0107] Condition 2: The bulking treatment temperature is 30°C and the treatment time is 40s; the degumming treatment temperature is 60°C and the treatment time is 180s.

[0108] Condition 3: The bulking treatment temperature is 30°C and the treatment time is 20s; the degumming treatment temperature is 60°C and the treatment time is 180s.

[0109] The desmear agent is prepared from the following raw materials in percentage by weight: 6% potassium permanganate, 8% sodium hydroxide and 86% water.

[0110] Test (I)

[0111] Observe whether there is glue residue or other impurities on the surfaces of all the debonded circuit boards obtained under processing conditions 1-3, and calculate the qualified rate of the debonded circuit boards under conditions 1-3.

[0112] Test (II)

[0113] After the test under condition 3, 10 PCB substrate resins with qualified appearance were observed in the SEM electron microscope to observe the uniformity of the honeycomb morphology of the PCB substrate board after the bite, and the area ratio of the unevenness was calculated and the average value was taken. The grades are as follows:

[0114] If the uneven area accounts for less than 3%, it is recorded as level 1; if the uneven area accounts for 3-6%, it is recorded as level 2; if the uneven area accounts for 6-9%, it is recorded as level 3; if the uneven area accounts for 9-12%, it is recorded as level 4; if the uneven area accounts for more than 12%, it is recorded as level 5.

[0115] The above experimental data are shown in Table 1.

[0116] Table 1 Experimental data of Examples 1-17 and Comparative Examples 1-7

[0117]

[0118]

[0119] Combining Example 1 and Comparative Examples 1-6 and Table 1, it can be seen that the qualified rates of Conditions 1-3 of Comparative Examples 1-6 are all less than 90%, while the qualified rates of Conditions 1-3 of Example 1 are all above 90%, indicating that the active group betaine derivatives, unsaturated polycarboxylic acid polymer solutions, porous silica aerogels, and thixotropic agents of the present application work together to have better bulking and activation effects. Therefore, the obtained bulking treatment agent can quickly play a bulking and activation role after being treated for 60s, 40s, and 20s, respectively, under this relatively short treatment time, thereby making the qualified rate of the circuit board after degumming higher.

[0120] The surface unevenness level of Example 1 is 4, and that of Comparative Examples 1-6 is 5, indicating that the debonding treatment after the treatment with the bulking agent of the present application can reduce the unevenness on the circuit board surface to a certain extent.

[0121] Combining Example 4 and Example 7-8 with Table 1, it can be seen that the qualified rates of conditions 1-3 of Example 7-8 are higher than that of Example 4, and the surface unevenness grade of Example 7-8 is 2, and the surface unevenness grade of Example 4 is 3, indicating that methacryloylethyl sulfobetaine and hexadecanoylamidopropyl hydroxypropyl sulfobetaine play a synergistic role, and are combined with a thixotropic agent and a solution of an unsaturated polycarboxylic acid polymer to reduce the hanging flow and sedimentation of the porous silica aerogel and play a better thixotropic effect. At the same time, the porous silica aerogel will not scratch the circuit board and affect the uniformity of the circuit board surface.

[0122] Combining Example 7 and Example 14-15 and Table 1, it can be seen that the qualified rates of Conditions 1-3 of Example 14-15 are higher than the qualified rate of Example 7, and the surface unevenness grade of Example 14-15 is 1, and the surface unevenness grade of Example 7 is 2, indicating that the amide-modified hydrogenated castor oil derivative, modified polyurea, and high molecular polymer containing amino groups and acid groups have a better synergistic effect, and cooperate with the active group betaine derivative and unsaturated polycarboxylic acid polymer to reduce the hanging flow and sedimentation of the porous silica aerogel, and have a better thixotropic effect. At the same time, the porous silica aerogel will not scratch the circuit board and affect the uniformity of the circuit board surface.

[0123] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A bulking agent, characterized in that: The following raw materials are used in parts by weight: composition: Organic solvent 38-46% Alkaline regulator 1-5% Stabilizer 0.1-0.5 parts 10-17% bulking agent The balance is water; The bulking activation solution is composed of an active group betaine derivative, a solution of an unsaturated polycarboxylic acid polymer, a porous silica aerogel, a thixotropic agent, an initiator, and propylene glycol methyl ether acetate in a weight ratio of (2-5): (1-3): (10-20): (0.3-0.8): (12-20): 0.1; The porous silica aerogel has a particle size of 100-300 nm; The active group betaine derivative is methacryloylethyl sulfobetaine and / or hexadecanoylamidopropyl hydroxypropyl sulfobetaine; The thixotropic agent is one or more of polyamide-modified hydrogenated castor oil derivatives, modified polyurea, and high molecular polymers containing amino groups and acid groups.

2. A bulking agent according to claim 1, characterized in that: The weight ratio of the methacryloylethyl sulfobetaine to the hexadecanoylamidopropyl hydroxypropyl sulfobetaine is (1-2):

1.

3. A bulking agent according to claim 1, characterized in that: The weight ratio of the polyamide-modified hydrogenated castor oil derivative, the modified polyurea, and the high molecular polymer containing amino groups and acid groups is 1:(1-2):(1-3).

4. A bulking agent according to claim 1, characterized in that: The alkaline regulator is one or more of sodium hydroxide, potassium hydroxide and sodium carbonate; the stabilizer is sodium hexametasulfate.

5. A bulking agent according to claim 1, characterized in that: The organic solvent is dimethylformamide and / or diethyl ethanol monobutyl ether.

6. A method for preparing a bulking agent as claimed in any one of claims 1 to 5, characterized in that: Prepared by the following method: According to weight, the active group betaine derivative, the solution of the unsaturated polycarboxylic acid polymer, the thixotropic agent, propylene glycol methyl ether acetate, and the initiator are weighed and mixed evenly, heated to 63-68° C., reacted for 1-2 hours, and then the porous silica aerogel is added and mixed evenly to obtain a bulking activation solution; According to parts by weight, an organic solvent, an alkaline regulator, a stabilizer, a bulking activating liquid and water are weighed and mixed evenly to obtain a bulking treatment agent.

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