CN114316775B - PU finishing paint for fingerprint identification chip and preparation method and use method thereof - Google Patents
PU finishing paint for fingerprint identification chip and preparation method and use method thereof Download PDFInfo
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Abstract
The invention discloses PU finishing paint for a fingerprint identification chip and a preparation method thereof. The PU finishing paint for the fingerprint identification chip is characterized by comprising the following raw materials in percentage by weight: 95-98% of semi-finished resin, 1-3% of fumed silica, 0.1-1% of defoaming agent and 0.1-1% of leveling agent; the semi-finished resin comprises the following raw materials in percentage by weight: 20-40% of diformate, 20-40% of white-proof and 30-50% of solid hydroxy acrylic resin with a hydroxyl value of more than 60. The invention creatively selects the solid hydroxyl acrylic resin with the diformate and the hydroxyl value of more than 60 to be mixed and stirred to form the semi-finished product resin, and then the semi-finished product resin is mixed with the fumed silica, the defoamer and the flatting agent to form the PU finish paint, so that the PU finish paint has better temperature resistant effect, can effectively avoid the paint from generating yellowing during laser cutting (1000 ℃ and reflow soldering (260 ℃) and has better artificial sweat resistance and better film crack resistance when applied to a fingerprint identification module.
Description
Technical Field
The invention relates to the technical field of conductive paint, in particular to PU (polyurethane) finishing paint for a fingerprint identification chip, and a preparation method and a use method thereof.
Background
Before the fingerprint identification chip is applied to a terminal, a paint protection layer needs to be sprayed on the packaged fingerprint identification chip, so that the effect of protecting the chip is achieved, and fingerprint information can be ensured to penetrate paint and be perceived by the chip.
The formula of the fingerprint module top paint comprises, by mass, 15-20% of acrylic acid, 25-30% of polyurethane acrylate, 5-10% of silicon dioxide, 0.1-1% of an ultraviolet absorber, 1-5% of a light superposition starting agent, 0.1-0.6% of a fluorine additive and the balance of a diluent, wherein the fluorine additive is an M-907 type fluorine additive. The finishing paint can enable the water drop angle on the surface of the fingerprint module to be stably kept above 100 degrees, can effectively avoid greasy dirt, sweat and pen marks from remaining on the surface of the fingerprint module, and ensures the detection accuracy of the fingerprint module.
As another example, the Chinese patent invention discloses a fingerprint identification coating, which comprises a primer, a middle paint and a top paint, wherein the primer comprises the following raw material components in parts by mass: 23 to 27 parts of castor oil based UV curing polyurethane acrylic ester and 0.15 to 0.22 part of polyether modified polysiloxane flatting agent; the traditional Chinese paint comprises the following raw material components in parts by weight: 82-90 parts of castor oil based UV curing polyurethane acrylic ester and 0.15-0.22 part of polyether modified polysiloxane flatting agent; the finishing paint comprises the following raw material components in parts by mass: 65-68 parts of castor oil based UV cured polyurethane acrylic ester and 0.15-0.22 part of polyether modified polysiloxane flatting agent. The paint has good leveling effect, hydrolysis resistance and low temperature resistance, and is excellent in electrical insulation property and adhesive force, thus being a paint with excellent comprehensive performance.
However, after the chip printing or spraying of the fingerprint identification module is completed, the next working procedures are laser cutting and reflow soldering, the laser cutting can instantly generate 1000 ℃ high temperature, and the reflow soldering can generate 260 ℃ high temperature for 5 minutes, and the two working procedures can cause the surface coating of the module including the fingerprint identification module of the two schemes to generate yellowing, so that the color and texture are seriously affected, and particularly, the yellowing is quite serious when the fingerprint identification module is used as a white product.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides PU finishing paint for a fingerprint identification chip, and a preparation method and a use method thereof. The invention creatively selects the solid hydroxyl acrylic resin with the diformate and the hydroxyl value of more than 60 to be mixed and stirred to form the semi-finished product resin, and then the semi-finished product resin is mixed with the fumed silica, the defoamer and the flatting agent to form the PU finish paint, so that the PU finish paint has better temperature resistant effect, can effectively avoid the paint from generating yellowing during laser cutting (1000 ℃ and reflow soldering (260 ℃) and has better artificial sweat resistance and better film crack resistance when applied to a fingerprint identification module.
The technical problems to be solved by the invention are realized by the following technical scheme:
the PU finishing paint for the fingerprint identification chip comprises the following raw materials in percentage by weight: 95-98% of semi-finished resin, 1-3% of fumed silica, 0.1-1% of defoaming agent and 0.1-1% of leveling agent; the semi-finished resin comprises the following raw materials in percentage by weight: 20-40% of diformate, 20-40% of white-proof and 30-50% of solid hydroxy acrylic resin with a hydroxyl value of more than 60.
As a preferable embodiment of the PU finishing paint for the fingerprint identification chip, the solid hydroxyl acrylic resin with the hydroxyl value of more than 60 is selected from solid hydroxyl acrylic resins with the hydroxyl value of more than 60 and less than 120. Preferably, but not limited to, such as BM259, BM261, BM268, BM357, BM51, etc. manufactured by Shanghai Boyle chemical Co., ltd. Also, for example, uracron 7106×65, uracron 7110×70, uracron 7122×50, etc. produced by Imperial soman group of Netherlands.
As a preferable implementation mode of the PU finishing paint for the fingerprint identification chip, the semi-finished resin is fully dissolved by a dispersing machine at 3000-3500rpm before being used.
As a preferable implementation mode of the PU finishing paint for the fingerprint identification chip, the PU finishing paint is added with a curing agent before use, and the weight ratio of the PU finishing paint to the curing agent is (9-11) (2-4).
As a preferable implementation mode of the PU finishing paint for the fingerprint identification chip, provided by the invention, the curing agent is an XDI curing agent.
As a preferable implementation mode of the PU finishing paint for the fingerprint identification chip, the defoaming agent is Haimangsi hum 6800 or 5400.
As a preferable implementation mode of the PU finishing paint for the fingerprint identification chip, the leveling agent is one or more of PickBYK 333, german Digao 435 and German Digao 450.
The preparation method of the PU finishing paint for the fingerprint identification chip comprises the following steps: and (3) feeding according to a formula, uniformly stirring, grinding for several times, and obtaining the product with fineness of less than 5U.
The application method of the PU finishing paint for the fingerprint identification chip is characterized by comprising the following steps of:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) Sequentially forming a primer and a middle paint on the covering surface;
(3) Forming a finishing paint on the intermediate paint, wherein the finishing paint adopts the PU finishing paint;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board in the step (3), performing splitting treatment to obtain a single fingerprint identification chip, and finally binding the single fingerprint identification chip with the driving chip for reflow soldering.
As a preferred implementation mode of the method for using the PU finishing paint for the fingerprint identification chip, the method for forming the finishing paint on the middle paint specifically comprises the following steps: mixing and stirring the PU finish paint and the curing agent according to the weight ratio of (9-11) (2-4), screen printing on the middle paint, and thermally curing at 85-95 ℃ for 1.5-2.5 h; or (2-4) mixing and stirring the PU finishing paint and the curing agent according to the weight ratio of (9-11), adding the diluent to control the viscosity to be 8-10 seconds in a salt pan cup, then spraying the mixture on the middle paint, controlling the film thickness to be 10-12 mu m, and carrying out low-temperature thermal curing and then high-temperature thermal curing.
Compared with the prior art, the invention has the following beneficial effects:
the invention creatively selects the solid hydroxyl acrylic resin with the diformate and the hydroxyl value of more than 60 to be mixed and stirred to form the semi-finished product resin, and then the semi-finished product resin is mixed with the fumed silica, the defoamer and the flatting agent to form the PU finish paint, so that the PU finish paint has better temperature resistant effect, can effectively avoid the paint from generating yellowing during laser cutting (1000 ℃ and reflow soldering (260 ℃) and has better artificial sweat resistance and better film crack resistance when applied to a fingerprint identification module.
Drawings
FIG. 1 is a schematic view of the back of a fingerprint recognition chip board before dicing according to the present invention;
FIG. 2 is a schematic front view of a fingerprint recognition chip board before dicing according to the present invention;
fig. 3 is a schematic view of a front portion of a cut fingerprint recognition chip board according to the present invention.
Detailed Description
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.
Unless otherwise defined, all terms used in the specification have the same meaning as commonly understood by one of ordinary skill in the art, but are defined in the specification to be used in the event of a conflict.
The terms "comprising," "including," "containing," "having," or other variations thereof herein are intended to cover a non-closed inclusion, without distinguishing between them. The term "comprising" means that other steps and ingredients may be added that do not affect the end result. The term "comprising" also includes the terms "consisting of …" and "consisting essentially of …". The compositions and methods/processes of the present invention comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as additional or optional ingredients, components, steps, or limitations of any of the embodiments described herein.
All numbers or expressions referring to amounts of components, process conditions, etc. used in the specification and claims are to be understood as modified in all instances by "about". All ranges directed to the same component or property are inclusive of the endpoints, which endpoints are independently combinable. Because these ranges are continuous, they include every value between the minimum and maximum values. It should also be understood that any numerical range recited herein is intended to include all sub-ranges within that range.
The present invention will be described in detail with reference to the following examples, which are only preferred embodiments of the present invention and are not limiting thereof.
Example 1
The PU finishing paint for the fingerprint identification chip comprises the following raw materials in percentage by weight: 97% of semi-finished resin, 2% of fumed silica, 0.6% of defoamer and 0.4% of flatting agent; the semi-finished resin comprises the following raw materials in percentage by weight: 30% of diformate, 20% of white-preventing agent and 50% of solid hydroxy acrylic resin with a hydroxyl value of more than 60.
In this embodiment, the hydroxy acrylic resin is BM261 produced by Shanghai borrelia chemical industry limited.
The preparation method of the PU finishing paint for the fingerprint identification chip comprises the following steps: feeding according to the formula of the semi-finished resin, and fully dissolving the semi-finished resin by using a dispersing machine at 3000-3500rpm to obtain the semi-finished resin; and then feeding according to the formula of the finish paint, uniformly stirring, grinding for several times by using a three-roller machine, and obtaining the finish paint with fineness of below 5U.
The application method of the PU finishing paint for the fingerprint identification chip adopts a silk screen printing mode and specifically comprises the following steps of:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) After the white ink is silk-screened on the coverage surface by 420 meshes, baking the coverage surface for 10min at 160 ℃ to form a primer, and then, the coverage surface is silk-screened by 420 meshes for pearl white, and baking the coverage surface for 10min at 160 ℃ to form a medium paint;
(3) Forming a top coat on the middle paint: the weight ratio of the PU finishing paint to the XDI curing agent is 10:3, after uniformly stirring, carrying out screen printing by 350 meshes, and baking for 2 hours at 90 ℃;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board (shown in fig. 1 and 2) in the step (3), and carrying out splitting treatment to obtain a single fingerprint identification chip (shown in fig. 3), and finally binding the single fingerprint identification chip with the driving chip for reflow soldering (the duration is 5min at 260 ℃).
Example 2
The PU finishing paint for the fingerprint identification chip comprises the following raw materials in percentage by weight: 95% of semi-finished resin, 3% of fumed silica, 1% of defoamer and 1% of flatting agent; the semi-finished resin comprises the following raw materials in percentage by weight: 40% of diformate, 30% of white-preventing agent and 30% of solid hydroxy acrylic resin with a hydroxyl value of more than 60.
In this embodiment, the hydroxy acrylic resin is BM666 available from Shanghai borrelia chemical industry limited.
The preparation method of the PU finishing paint for the fingerprint identification chip comprises the following steps: feeding according to the formula of the semi-finished resin, and fully dissolving the semi-finished resin by using a dispersing machine at 3000-3500rpm to obtain the semi-finished resin; and then feeding according to the formula of the finish paint, uniformly stirring, grinding for several times by using a three-roller machine, and obtaining the finish paint with fineness of below 5U.
The application method of the PU finishing paint for the fingerprint identification chip adopts a silk screen printing mode and specifically comprises the following steps of:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) After the white ink is silk-screened on the coverage surface by 420 meshes, baking the coverage surface for 10min at 160 ℃ to form a primer, and then, the coverage surface is silk-screened by 420 meshes for pearl white, and baking the coverage surface for 10min at 160 ℃ to form a medium paint;
(3) Forming a top coat on the middle paint: the weight ratio of the PU finishing paint to the XDI curing agent is 10:3, after uniformly stirring, carrying out screen printing by 350 meshes, and baking for 2 hours at 90 ℃;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board in the step (3), performing splitting treatment to obtain a single fingerprint identification chip, and finally binding the single fingerprint identification chip with the driving chip for reflow soldering (the temperature of 260 ℃ lasts for 5 min).
Example 3
The PU finishing paint for the fingerprint identification chip comprises the following raw materials in percentage by weight: 98% of semi-finished resin, 1% of fumed silica, 0.9% of defoamer and 0.1% of flatting agent; the semi-finished resin comprises the following raw materials in percentage by weight: 20% of diformate, 40% of white-preventing agent and 40% of solid hydroxy acrylic resin with a hydroxyl value of more than 60.
In this embodiment, the hydroxy acrylic resin is selected from BM666 and BM51 of Shanghai Boril chemical industry Co., ltd.
The preparation method of the PU finishing paint for the fingerprint identification chip comprises the following steps: feeding according to the formula of the semi-finished resin, and fully dissolving the semi-finished resin by using a dispersing machine at 3000-3500rpm to obtain the semi-finished resin; and then feeding according to the formula of the finish paint, uniformly stirring, grinding for several times by using a three-roller machine, and obtaining the finish paint with fineness of below 5U.
The application method of the PU finishing paint for the fingerprint identification chip adopts a silk screen printing mode and specifically comprises the following steps of:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) After the white ink is silk-screened on the coverage surface by 420 meshes, baking the coverage surface for 12min at 160 ℃ to form a primer, and then, the coverage surface is silk-screened by 420 meshes for pearl white, and baking the coverage surface for 8min at 160 ℃ to form a medium paint;
(3) Forming a top coat on the middle paint: the weight ratio of the PU finishing paint to the XDI curing agent is 11:4, after uniformly stirring, carrying out 350-mesh silk screen printing and baking at 90 ℃ for 1.5h;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board in the step (3), performing splitting treatment to obtain a single fingerprint identification chip, and finally binding the single fingerprint identification chip with the driving chip for reflow soldering (the temperature of 260 ℃ lasts for 5 min).
Example 4
The PU finishing paint for the fingerprint identification chip comprises the following raw materials in percentage by weight: 96% of semi-finished resin, 2.6% of fumed silica, 0.8% of defoamer and 0.6% of flatting agent; the semi-finished resin comprises the following raw materials in percentage by weight: 32% of diformate, 25% of white-preventing agent and 43% of solid hydroxy acrylic resin with a hydroxyl value of more than 60.
In this example, the hydroxyacrylic resin was Uracron 7106×65, which is a group of Imperial, netherlands.
The preparation method of the PU finishing paint for the fingerprint identification chip comprises the following steps: feeding according to the formula of the semi-finished resin, and fully dissolving the semi-finished resin by using a dispersing machine at 3000-3500rpm to obtain the semi-finished resin; and then feeding according to the formula of the finish paint, uniformly stirring, grinding for several times by using a three-roller machine, and obtaining the finish paint with fineness of below 5U.
The application method of the PU finishing paint for the fingerprint identification chip adopts a spraying mode and specifically comprises the following steps of:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) Spraying silver primer on the covering surface, and baking at 70 ℃ for 25min to form primer, wherein the film thickness is 5 mu m; then spraying silver medium paint, wherein the film thickness is 8 mu m, and baking at 70 ℃ for 25min to form the medium paint;
(3) Forming a top coat on the middle paint: the PU finishing paint and the XDI curing agent are mixed according to the weight ratio of 10:3, uniformly stirring, adding a diluent to control the viscosity in a salt pan cup for 8-10 seconds, spraying, baking at the temperature of 70 ℃ for 25min with the film thickness of 10-12 um, and finally baking at the temperature of 90 ℃ for 120min;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board in the step (3), performing splitting treatment to obtain a single fingerprint identification chip, and finally binding the single fingerprint identification chip with the driving chip for reflow soldering (the temperature of 260 ℃ lasts for 5 min).
Comparative example 1
Comparative example 1 differs from example 1 only in that: the semi-finished resin comprises the following raw materials in percentage by weight: 30% of dibasic ester, 20% of white spirit prevention and 50% of solid hydroxyl acrylic resin with a hydroxyl value of 48, wherein the solid hydroxyl acrylic resin is selected from BM655 produced by Shanghai Borile chemical industry Co.
Comparative example 2
Comparative example 2 differs from example 1 only in that: the semi-finished resin comprises the following raw materials in percentage by weight: 30% of dibasic ester, 20% of DABAI and 50% of solid hydroxyl acrylic resin with a hydroxyl value of 140, wherein the solid hydroxyl acrylic resin is BM666 produced by Shanghai Boril chemical industry Co.
Comparative example 3
Comparative example 3 differs from example 1 only in that: the semi-finished resin comprises the following raw materials in percentage by weight: 30% of isophorone, 20% of white spirit prevention and 50% of solid hydroxy acrylic resin with a hydroxyl value of 60.
Comparative example 4
Comparative example 4 differs from example 1 only in that: the semi-finished resin comprises the following raw materials in percentage by weight: 30% of butyl acetate, 20% of white master and 50% of solid hydroxy acrylic resin with a hydroxyl value of 60.
The PU top coats of examples 1-4 and comparative examples 1-3 were screen printed on a fingerprint recognition module chip according to the method of example 1, and then subjected to adhesion test, RCA test, yellowing, artificial sweat, and water boiling test and cutting effect, and the test results are shown in the following table.
The cutting effect means that after reflow soldering, whether cracks exist on the surface of the coating layer is observed in a visual mode.
In comparative example 1, a solid hydroxy acrylic resin with a hydroxyl value of 48 is selected, and the product has poor wear resistance; in comparative example 2, solid hydroxyl acrylic resin with a hydroxyl value of 140 is selected, and the finish paint falls off and has poor artificial sweat resistance effect when the product is boiled in water; in comparative example 3, isophorone was used as a solvent, and yellowing resistance was poor.
The finish paint of the embodiments 1-4 adopts solid hydroxyl acrylic resin with a specific hydroxyl value (the hydroxyl value is more than 60) and dibasic ester to be compounded and stirred to form semi-finished resin, and then the semi-finished resin is mixed with fumed silica, a defoaming agent and a leveling agent to form the PU finish paint, so that the PU finish paint has better temperature resistant effect, and can effectively avoid yellowing of the paint during laser cutting (1000 ℃ and reflow soldering (260 ℃) and better artificial sweat resistance and better film crack resistance when applied to a fingerprint identification module.
The above examples only show embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention, but all technical solutions obtained by equivalent substitution or equivalent transformation shall fall within the scope of the invention.
Claims (7)
1. The PU finishing paint for the fingerprint identification chip is characterized by comprising the following raw materials in percentage by weight: 95-98% of semi-finished resin, 1-3% of fumed silica, 0.1-1% of defoaming agent and 0.1-1% of leveling agent; the semi-finished resin comprises the following raw materials in percentage by weight: 20-40% of diformate, 20-40% of white-preventing agent and 30-50% of solid hydroxy acrylic resin with a hydroxyl value of more than 60; the solid hydroxyl acrylic resin with the hydroxyl value of more than 60 is selected from solid hydroxyl acrylic resins with the hydroxyl value of more than 60 and less than 120;
the PU finishing paint is added with a curing agent before use, and the weight ratio of the PU finishing paint to the curing agent is (9-11) (2-4);
the curing agent is an XDI curing agent.
2. The PU topcoat for fingerprint identification chip of claim 1, wherein the semi-finished resin is sufficiently dissolved by a disperser 3000-3500rpm before use.
3. The PU topcoat for fingerprint identification chips of claim 1, wherein the defoamer is a hamming court 6800 or 5400.
4. The PU topcoat for fingerprint identification chips of claim 1, wherein the leveling agent is one or more of the group consisting of bikes 333, dydi 435, and dydi 450.
5. The method for preparing the PU finishing paint for the fingerprint identification chip as claimed in claim 1, which is characterized by comprising the following steps: the formula according to claim 1 is added, and after being stirred uniformly, the mixture is ground for several times, wherein the fineness is less than 5U.
6. The method for using the PU finishing paint for the fingerprint identification chip as claimed in claim 1, which is characterized by comprising the following steps:
(1) Providing a fingerprint identification chip board, wherein the fingerprint identification chip board is provided with a package body and a plurality of fingerprint identification bare chips which are embedded in the package body and are distributed in a matrix; the front surface of the package body is a covering surface and the back surface of the package body is a binding surface;
(2) Sequentially forming a primer and a middle paint on the covering surface;
(3) Forming a top coat on the intermediate coat, wherein the top coat adopts the PU top coat as claimed in claim 1;
(4) And (3) carrying out laser cutting on the fingerprint identification chip board in the step (3), performing splitting treatment to obtain a single fingerprint identification chip, and finally binding the single fingerprint identification chip with the driving chip for reflow soldering.
7. The method of using the PU topcoat for a fingerprint identification chip of claim 6, wherein the forming the topcoat on the topcoat comprises the steps of: mixing and stirring the PU finish paint and the curing agent according to the weight ratio of (9-11) (2-4), screen printing on the intermediate paint, and thermally curing at 85-95 ℃ for 1.5-2.5 hours; or mixing and stirring the PU finish paint and the curing agent according to the weight ratio of (9-11) (2-4), adding a diluent to control the viscosity to be 8-10 seconds in a salt pan cup, spraying the mixture on the middle paint, controlling the film thickness to be 10-12 mu m, baking the mixture for 25 minutes at 70 ℃, and finally baking the mixture for 120 minutes at 90 ℃.
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| CN109385200A (en) * | 2018-06-06 | 2019-02-26 | 昆山建皇光电科技有限公司 | Fingerprint mould group topcoat formulation |
| CN112307972A (en) * | 2020-10-30 | 2021-02-02 | 维沃移动通信有限公司 | Fingerprint identification assembly, electronic equipment and processing method of fingerprint identification assembly |
| CN112831265A (en) * | 2020-12-31 | 2021-05-25 | 上海飞凯光电材料股份有限公司 | PU (polyurethane) coating and application thereof |
| CN113388303A (en) * | 2021-07-01 | 2021-09-14 | 恒昌涂料（惠阳）有限公司 | Anti-shielding conductive coating applied to 5G consumer electronics equipment |
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