1. A synthetic method of water-soluble UV light-cured solder resist ink resin applied to a PCB is characterized in that itaconic acid is grafted on an epoxy functional group of triglycidyl isocyanurate, namely double bonds and carboxyl are introduced, and then neutralization and salification are carried out to obtain water-based ink resin, so that water replaces a solvent, and VOC emission is reduced, and the method comprises the following steps:

step1, adding 90-110 parts of triglycidyl isocyanurate, 110-130 parts of itaconic acid and 3-4 parts of polymerization inhibitor 2, 6-di-tert-butyl-p-cresol into a reaction device, and heating to 100 ℃;

step2, adding 1-2 parts of catalyst N, N-dimethylaniline, preserving heat at 105 ℃, and measuring an acid value by pumping;

step3, when the acid value is reduced to 22-25 mgKOH/g, the temperature is reduced to 70 ℃;

step4, adding a neutralizing agent until the pH value is 7, adding 40-60 parts of deionized water, uniformly stirring, and discharging to obtain a multifunctional UV resin matrix A;

step5, adjusting the flexibility of the UV resin by blending the UV resin with single functionality or dual functionality;

in the process of synthesizing the UV polyester resin, hexamethylenediamine is used for replacing part of dihydric alcohol, maleic anhydride is added in the later synthesis stage to introduce double bonds, the acid value is well controlled, and neutralization and salt formation are carried out to obtain the water-based UV polyester resin, which comprises the following steps:

step6, adding 90-110 parts of isophthalic acid, 40-60 parts of adipic acid, 80-100 parts of neopentyl glycol, 40-60 parts of diethylene glycol, 10-30 parts of hexamethylenediamine and 1-2 parts of dibutyltin dilaurate into a reaction device, and keeping the temperature when the temperature is raised to 140 ℃;

step7, continuing to heat up to 240 ℃ at the rate of 20 ℃/1h, and preserving the temperature at 240 ℃ until the acid value is reduced to below 5 mgKOH/g;

step8, cooling to 150 ℃, adding 50-70 parts of maleic anhydride, heating to 180 ℃, and keeping the acid value to 40-45 mgKOH/g;

step9, cooling to 70 ℃, and adding a neutralizing agent until the pH value is 7;

step10, adding deionized water, and stirring uniformly;

step11, discharging to obtain a mono-functionality or bi-functionality UV resin B with excellent flexibility;

step12, blending the two resins A and B synthesized in the Step according to a certain proportion to form a resin matrix of the water-soluble UV light-cured solder mask ink;

step 13; based on the Step12, the water-soluble UV light-cured solder resist ink is prepared by matching pigment, filler, water-based photoinitiator, auxiliary agent, cosolvent and water.

2. The water-soluble UV light-cured solder resist ink resin applied to the PCB as recited in claim 1, comprising 10-15 parts of resin A, 30-35 parts of resin B, 30 parts of titanium dioxide, 5 parts of fumed silica, 5 parts of photoinitiator, 0.2 part of defoamer, 0.5 part of leveling agent, 5 parts of BCS and 10 parts of deionized water by weight.

3. The method for synthesizing the water-soluble UV light-curable solder mask ink resin for the PCB circuit board as recited in claim 1, wherein the temperature of Step2 at 105 ℃ is maintained for 3 h.

4. The method for synthesizing the water-soluble UV light-curable solder mask ink resin for the PCB circuit board as claimed in claim 1, wherein the temperature of each component in Step6 is raised to 140 ℃ and kept for 0.5 h.

5. The method for synthesizing the water-soluble UV light-curable solder mask ink resin for the PCB as claimed in claim 1, wherein the weight of the deionized water added in Step10 is 80-100 parts.

Background

The solder resist ink is protective ink covered on a Printed Circuit Board (PCB), is one of important materials required in the manufacture of the printed circuit board, is gradually valued along with the more and more refined and high-density electronic circuit, and particularly has strict VOC emission limitation along with the more and more strict national environmental protection requirements, and on the other hand, the oily UV light-cured solder resist ink can generate VOC in the production and use processes, so that the oily UV light-cured solder resist ink gradually formed in the market is greatly influenced, the water is slightly influenced, particularly the process of switching ink process cleaning equipment can be used for cleaning by using water to replace a solvent, and the VOC emission can be greatly reduced;

when a printed circuit board enters a peak-loading welding process of assembly, the heat resistance (also called dip-soldering performance) of a solder resist ink film layer is an important quality index, and if the heat resistance is poor, the solder resist ink film layer cannot bear thermal shock of solder, so that quality problems such as discoloration, bubbling, falling and the like can be caused. Because the fluidity of the solder is required to be more than 260 ℃, the heat resistance of the solder resist ink needs to reach the quality requirement of 280 ℃ for 10 seconds to meet the requirement of the welding procedure, and the requirement that the main body resin for forming the solder resist ink must meet the performance requirement is required;

in the market, the UV light-cured solder resist ink basically mainly takes oil as main material, the water-based UV light-cured solder resist ink rarely appears, the performance of the water-based UV light-cured solder resist ink is poor, particularly the high temperature resistance is difficult to meet the market requirement, or the concept of stealing and exchanging is adopted, the solvent of oil-based UV resin is exchanged into the solvent with better water compatibility, so that a small amount of water can be added, and the water-based UV light-cured solder resist ink is popularized as a water-based product; therefore, we propose a synthetic method of water-soluble UV light-curable solder resist ink resin applied to PCB circuit boards.

Disclosure of Invention

The invention aims to provide a synthetic method of water-soluble UV light-cured solder mask ink resin applied to a PCB (printed circuit board), so as to solve the problems in the background.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a method for synthesizing water-soluble UV light-cured solder resist ink resin applied to a PCB (printed Circuit Board), which comprises the following steps of grafting itaconic acid on an epoxy functional group of triglycidyl isocyanurate, introducing double bonds and carboxyl, and neutralizing to form salt so as to realize water-based hydration, thereby realizing that water replaces a solvent and reducing VOC (volatile organic compounds) emission, wherein the method comprises the following steps:

step1, adding 90-110 parts of triglycidyl isocyanurate, 110-130 parts of itaconic acid and 3-4 parts of polymerization inhibitor 2, 6-di-tert-butyl-p-cresol into a reaction device, and heating to 100 ℃;

step2, adding 1-2 parts of catalyst N, N-dimethylaniline, preserving heat at 105 ℃, and measuring an acid value by pumping;

step3, when the acid value is reduced to 22-25 mgKOH/g, the temperature is reduced to 70 ℃;

step4, adding a neutralizing agent until the pH value is 7, adding 40-60 parts of deionized water, uniformly stirring, and discharging to obtain a multifunctional UV resin matrix A;

step5, because the UV resin matrix A belongs to a multifunctional UV resin matrix, and the resin matrix is made of the UV resin matrix A, the paint film is too hard to cause brittleness, so that the flexibility of the paint film is adjusted by blending the monofunctional or bifunctional UV resin;

in the process of synthesizing the UV polyester resin, hexamethylenediamine is used for replacing part of dihydric alcohol, maleic anhydride is added in the later synthesis stage to introduce double bonds, the acid value is well controlled, and neutralization and salt formation are carried out to obtain the water-based UV polyester resin, which comprises the following steps:

step6, adding 90-110 parts of isophthalic acid, 40-60 parts of adipic acid, 80-100 parts of neopentyl glycol, 40-60 parts of diethylene glycol, 10-30 parts of hexamethylenediamine and 1-2 parts of dibutyltin dilaurate into a reaction device, and keeping the temperature when the temperature is raised to 140 ℃;

step7, continuing to heat up to 240 ℃ at the rate of 20 ℃/1h, and preserving the temperature at 240 ℃ until the acid value is reduced to below 5 mgKOH/g;

step8, cooling to 150 ℃, adding 50-70 parts of maleic anhydride, heating to 180 ℃, and keeping the acid value to 40-45 mgKOH/g;

step9, cooling to 70 ℃, and adding a neutralizing agent until the pH value is 7;

step10, adding deionized water, and stirring uniformly;

step11, discharging to obtain a mono-functionality or bi-functionality UV resin B with excellent flexibility;

step12, blending the two resins A and B synthesized in the Step according to a certain proportion to form a resin matrix of the water-soluble UV light-cured solder mask ink;

step 13; based on the Step12, the water-soluble UV photocuring solder resist ink is prepared by matching pigment and filler, a water-based photoinitiator, an auxiliary agent, a cosolvent and water, and has excellent performance.

Preferably, the paint comprises, by weight, 10-15 parts of resin A, 30-35 parts of resin B, 30 parts of titanium dioxide, 5 parts of fumed silica, 5 parts of a photoinitiator, 0.2 part of a defoaming agent, 0.5 part of a leveling agent, 5 parts of BCS and 10 parts of deionized water.

Preferably, the temperature of the Step2 at 105 ℃ is kept for 3 h.

Preferably, the temperature of each component in Step6 is increased to 140 ℃ and is kept for 0.5 h.

Preferably, the weight of deionized water added in Step10 is 80-100 parts.

The invention has the following beneficial effects:

the triglycidyl isocyanurate has a triazine core skeleton, so that the triglycidyl isocyanurate has excellent heat resistance, weather resistance and flame retardance, and 3 epoxy groups are modified by itaconic acid to form a cross-linking agent, so that the triglycidyl isocyanurate has high curing speed and high cross-linking density and is a resin matrix with excellent performance.

According to the invention, an amido bond is formed through a condensation reaction of amino of hexamethylene diamine and carboxyl of polybasic acid, so that good heat resistance is obtained, then maleic anhydride is used for modification, an unsaturated bond is introduced, the dosage of maleic anhydride is controlled, the resin becomes mono-or di-functionality UV resin, and a cured paint film has good flexibility, heat resistance and low shrinkage.

In conclusion, the two resins are used in combination, and the prepared water-soluble UV light-cured solder resist ink has excellent performance and can meet the increasingly high demands of the market.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a method for synthesizing a water-soluble UV light-curable solder resist ink resin applied to a PCB circuit board according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Please refer to fig. 1: the invention relates to a method for synthesizing water-soluble UV light-cured solder resist ink resin applied to a PCB (printed Circuit Board), which comprises the following steps of grafting itaconic acid on an epoxy functional group of triglycidyl isocyanurate, introducing double bonds and carboxyl, and neutralizing to form salt so as to realize water-based hydration, thereby realizing that water replaces a solvent and reducing VOC (volatile organic compounds) emission, wherein the method comprises the following steps:

step1, adding 90-110 parts of triglycidyl isocyanurate, 110-130 parts of itaconic acid and 3-4 parts of polymerization inhibitor 2, 6-di-tert-butyl-p-cresol into a reaction device, and heating to 100 ℃;

step2, adding 1-2 parts of catalyst N, N-dimethylaniline, preserving heat at 105 ℃, and measuring an acid value by pumping;

step3, when the acid value is reduced to 22-25 mgKOH/g, the temperature is reduced to 70 ℃;

step4, adding a neutralizing agent until the pH value is 7, adding 40-60 parts of deionized water, uniformly stirring, and discharging to obtain a multifunctional UV resin matrix A;

step5, adjusting the flexibility of the UV resin by blending the UV resin with single functionality or dual functionality;

in the process of synthesizing the UV polyester resin, hexamethylenediamine is used for replacing part of dihydric alcohol, maleic anhydride is added in the later synthesis stage to introduce double bonds, the acid value is well controlled, and neutralization and salt formation are carried out to obtain the water-based UV polyester resin, which comprises the following steps:

step6, adding 90-110 parts of isophthalic acid, 40-60 parts of adipic acid, 80-100 parts of neopentyl glycol, 40-60 parts of diethylene glycol, 10-30 parts of hexamethylenediamine and 1-2 parts of dibutyltin dilaurate into a reaction device, and keeping the temperature when the temperature is raised to 140 ℃;

step7, continuing to heat up to 240 ℃ at the rate of 20 ℃/1h, and preserving the temperature at 240 ℃ until the acid value is reduced to below 5 mgKOH/g;

step8, cooling to 150 ℃, adding 50-70 parts of maleic anhydride, heating to 180 ℃, and keeping the acid value to 40-45 mgKOH/g;

step9, cooling to 70 ℃, and adding a neutralizing agent until the pH value is 7;

step10, adding deionized water, and stirring uniformly;

step11, discharging to obtain a mono-functionality or bi-functionality UV resin B with excellent flexibility;

step12, blending the two resins A and B synthesized in the Step according to a certain proportion to form a resin matrix of the water-soluble UV light-cured solder mask ink;

step 13; based on the Step12, the water-soluble UV light-cured solder resist ink is prepared by matching pigment, filler, water-based photoinitiator, auxiliary agent, cosolvent and water.

The paint comprises, by weight, 10-15 parts of resin A, 30-35 parts of resin B, 30 parts of titanium dioxide, 5 parts of fumed silica, 5 parts of a photoinitiator, 0.2 part of a defoaming agent, 0.5 part of a leveling agent, 5 parts of BCS and 10 parts of deionized water.

Wherein the heat preservation time in Step2 at 105 ℃ is 3 h.

Wherein, the temperature of each component in Step6 is raised to 140 ℃ and is preserved for 0.5 h.

Wherein the weight of deionized water added in Step10 is 80-100 parts.

The high-performance water-based UV photocuring solder-resist resin for the ink can truly replace a solvent with water, reduce VOC (volatile organic compounds) emission and meet the performance requirement of the solder-resist ink.

Example two

The specific formula of the ink in the scheme is as follows:

according to the formula, firstly, dispersing at a high speed by a dispersing agent, controlling the temperature to be lower than 60 ℃ during the period, dispersing for 1h, and then grinding to the fineness of 10um by a three-roller machine;

based on the above formulation, the performance tests are shown in the following table:

as can be seen from the table above, the water-soluble UV photocuring solder resist ink resin has the advantages of good display state of each index, excellent use effect and strong popularization value.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.