Binder for steel plate and FPC (Flexible Printed Circuit)

Abstract

The invention discloses a binding agent for a steel plate and an FPC (Flexible Printed Circuit), relates to the technical field of binding agents, and solves the problems that an existing binding agent for the FPC is relatively low in binding strength during use, the position of the binding agent is easy to break due to the hardness of the steel plate and the flexibility of the FPC, and the like. The adhesive for the steel plate and the FPC comprises the following components in percentage by mass: 16 to 31 percent of acrylate, 13 to 26 percent of acrylamide, 25 to 41 percent of deionized water, 9 to 24 percent of butadiene, 8 to 23 percent of benzoxazine, 1 to 4 percent of emulsifier, 1 to 3 percent of defoaming agent, 1 to 4 percent of inorganic filler and 1 to 3 percent of coupling agent. According to the present invention, the acrylic ester, the acrylamide, the butadiene and the benzoxazine are fused to improve the interaction between the binder and the surface of the specific material, such that the bonding strength is improved, the high chemical stability can be maintained, the soft characteristic is provided, the storage modulus is high, and the hard characteristic is provided; therefore, the bonding between the steel plate and the FPC is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, in particular to an adhesive for steel plates and FPCs. Background Art

[0002] Flexible printed circuits (FPCs), made from polyimide or polyester film, are highly reliable and flexible printed circuit boards (PCBs). These circuits, often referred to as FPCs, feature high wiring density, light weight, and thin thickness. To ensure sufficient support during soldering and plugging, FPCs often require localized reinforcement to enhance the strength of the plug-in area and facilitate overall product assembly. This requires the use of adhesives to bond the steel plate to the FPC.

[0003] However, the existing adhesives for FPCs have low bonding strength during use. Due to the hardness of the steel plate itself and the flexibility of the FPC, the adhesive is easily broken. Therefore, it does not meet the existing needs. We have proposed an adhesive for steel plates and FPCs. Summary of the Invention

[0004] The purpose of the present invention is to provide an adhesive for steel plates and FPCs to solve the problems of low bonding strength of the existing adhesives for FPCs proposed in the above background technology, and easy breakage of the adhesive position due to the hardness of the steel plate itself and the flexibility of the FPC.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adhesive for steel plates and FPCs, comprising the following components, by mass percentage, including 16-31% acrylate, 13-26% acrylamide, 25-41% deionized water, 9-24% butadiene, 8-23% benzoxazine, 1-4% emulsifier, 1-3% defoamer, 1-4% inorganic filler, and 1-3% coupling agent.

[0006] Preferably, the following components, calculated by mass percentage, include 21% acrylate, 16% acrylamide, 31% deionized water, 14% butadiene, 13% benzoxazine, 2% emulsifier, 1.5% defoamer, 2% inorganic filler, and 1.5% coupling agent.

[0007] Preferably, the acrylic acid ester comprises at least one of the following components: methyl acrylate, ethyl acrylate and butyl acrylate, and the acrylamide comprises at least one of the following components: N-hydroxymethyl acrylamide and methylene bisacrylamide.

[0008] Preferably, the inorganic filler comprises at least one of the following components: silicon dioxide, aluminum oxide, mica powder and silicon nitride.

[0009] Preferably, the emulsifier is sodium pentafluorooctanoate, and the coupling agent comprises at least one of the following components: vinyl triethoxysilane, γ-methacryloxypropyl trimethoxysilane or vinyl trisilane.

[0010] Preferably, the defoaming agent comprises at least one of the following components: polyether silicone and star polyether.

[0011] A method for preparing an adhesive for a steel plate and an FPC comprises the following steps:

[0012] S1. Pour acrylate and butadiene, part of the inorganic filler and part of the deionized water into a first stirring device, and maintain the stirring speed at 1100 r / min, the stirring time for 15 minutes, and the temperature at 50° C. to obtain a uniform type A solution;

[0013] S2. Pour acrylamide of the desired color, benzoxazine, part of the inorganic filler, and part of the deionized water into a second stirring device, and maintain the stirring speed at 2800 r / min, the stirring time for 35 minutes, and the temperature at 40° C. to obtain a uniform Type B solution;

[0014] S3, mixing the type A solution and the type B solution, and adding the remaining deionized water thereto to obtain a type C mixed solution, then pouring the type C mixed solution into a third stirring device, and maintaining the stirring speed at 2500 r / min for 60 min, the temperature being controlled at 60° C., and sequentially adding a coupling agent, a defoaming agent, and an emulsifier during the stirring process to obtain a finished adhesive;

[0015] S4. After filtering the finished adhesive to remove impurities through filtering equipment, the adhesive is filled through filling equipment for storage.

[0016] Preferably, the finished adhesive needs to be stored at an ambient temperature of -10 to 0°C.

[0017] Preferably, when the finished adhesive is used for false bonding, the false bonding temperature needs to be maintained at 120-140°C.

[0018] Preferably, when the finished adhesive is used for actual bonding, the temperature of the false bonding should be maintained at 175-185°C.

[0019] Compared with the prior art, the preparation method of the present invention has the following beneficial effects:

[0020] 1. The present invention improves the interaction between the adhesive and the surface of a specific material by fusing acrylate, acrylamide, butadiene and benzoxazine, thereby increasing the bonding strength and helping the adhesive maintain high chemical stability;

[0021] 2. The present invention provides an adhesive for steel plates and FPCs, which has soft properties and a high storage modulus and hard properties, thereby facilitating bonding between the steel plates and the FPCs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The general flow chart for the preparation of the binder of the present invention is as follows;

[0023] Figure 2 Schematic diagram of the process of the adhesive processing of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] See also Figures 1 to 2 The present invention provides an embodiment of an adhesive for steel plates and FPCs, comprising the following components, by mass percentage, including 16-31% acrylate, 13-26% acrylamide, 25-41% deionized water, 9-24% butadiene, 8-23% benzoxazine, 1-4% emulsifier, 1-3% defoamer, 1-4% inorganic filler, and 1-3% coupling agent.

[0026] The following components, calculated by mass percentage, include 21% acrylate, 16% acrylamide, 31% deionized water, 14% butadiene, 13% benzoxazine, 2% emulsifier, 1.5% defoamer, 2% inorganic filler, and 1.5% coupling agent.

[0027] By combining acrylates, acrylamides, butadiene, and benzoxazine, the interaction between the adhesive and the surface of a specific material is improved, thereby enhancing bonding strength while helping the adhesive maintain high chemical stability.

[0028] The acrylate comprises at least one of the following components: methyl acrylate, ethyl acrylate, and butyl acrylate, and the acrylamide comprises at least one of the following components: N-methylol acrylamide and methylene bisacrylamide.

[0029] The inorganic filler comprises at least one of the following components: silicon dioxide, aluminum oxide, mica powder and silicon nitride.

[0030] The emulsifier is sodium pentadecafluorooctanoate, and the coupling agent comprises at least one of the following components: vinyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane or vinyl trisilane.

[0031] The defoamer comprises at least one of the following components: polyether silicone and star polyether.

[0032] A method for preparing an adhesive for a steel plate and an FPC comprises the following steps:

[0033] S1. Pour acrylate and butadiene, part of the inorganic filler and part of the deionized water into a first stirring device, and maintain the stirring speed at 1100 r / min, the stirring time for 15 minutes, and the temperature at 50° C. to obtain a uniform type A solution;

[0034] S2. Pour acrylamide of the desired color, benzoxazine, part of the inorganic filler, and part of the deionized water into a second stirring device, and maintain the stirring speed at 2800 r / min, the stirring time for 35 minutes, and the temperature at 40° C. to obtain a uniform Type B solution;

[0035] S3, mixing the type A solution and the type B solution, and adding the remaining deionized water thereto to obtain a type C mixed solution, then pouring the type C mixed solution into a third stirring device, and maintaining the stirring speed at 2500 r / min for 60 min, the temperature being controlled at 60° C., and sequentially adding a coupling agent, a defoaming agent, and an emulsifier during the stirring process to obtain a finished adhesive;

[0036] S4. After filtering the finished adhesive to remove impurities through filtering equipment, the adhesive is filled through filling equipment for storage.

[0037] The finished adhesive should be stored at an ambient temperature of -10 to 0°C.

[0038] When the finished adhesive is being falsely joined, the temperature of the false joint must be maintained at 120-140°C.

[0039] When the finished adhesive is used for main joints, the temperature of the false joints must be maintained at 175-185°C.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An adhesive for steel plates and FPCs, characterized by: The following components, calculated by mass percentage, include 16-31% of acrylate, 13-26% of acrylamide, 25-41% of deionized water, 9-24% of butadiene, 8-23% of benzoxazine, 1-4% of emulsifier, 1-3% of defoamer, 1-4% of inorganic filler, and 1-3% of coupling agent.

2. The adhesive for steel plate and FPC according to claim 1, characterized in that: The following components, calculated by mass percentage, include 21% acrylate, 16% acrylamide, 31% deionized water, 14% butadiene, 13% benzoxazine, 2% emulsifier, 1.5% defoamer, 2% inorganic filler, and 1.5% coupling agent.

3. The adhesive for steel plate and FPC according to claim 1, characterized in that: The acrylic acid ester comprises at least one of the following components: methyl acrylate, ethyl acrylate, and butyl acrylate; and the acrylamide comprises at least one of the following components: N-methylol acrylamide and methylene bisacrylamide.

4. The adhesive for steel plate and FPC according to claim 1, characterized in that: The inorganic filler comprises at least one of the following components: silicon dioxide, aluminum oxide, mica powder and silicon nitride.

5. The adhesive for steel plate and FPC according to claim 1, characterized in that: The emulsifier is sodium pentafluorooctanoate, and the coupling agent comprises at least one of the following components: vinyl triethoxysilane, γ-methacryloxypropyl trimethoxysilane or vinyl trisilane.

6. The adhesive for steel plate and FPC according to claim 1, characterized in that: The defoamer comprises at least one of the following components: polyether silicone and star polyether.

7. A method for preparing an adhesive for steel plates and FPCs, characterized in that: The steps include: S1. Pour acrylate and butadiene, part of the inorganic filler and part of the deionized water into a first stirring device, and maintain the stirring speed at 1100 r / min, the stirring time for 15 minutes, and the temperature at 50° C. to obtain a uniform type A solution; S2. Pour acrylamide of the desired color, benzoxazine, part of the inorganic filler, and part of the deionized water into a second stirring device, and maintain the stirring speed at 2800 r / min, the stirring time for 35 minutes, and the temperature at 40° C. to obtain a uniform Type B solution; S3, mixing the type A solution and the type B solution, and adding the remaining deionized water thereto to obtain a type C mixed solution, then pouring the type C mixed solution into a third stirring device, and maintaining the stirring speed at 2500 r / min for 60 min, the temperature being controlled at 60° C., and sequentially adding a coupling agent, a defoaming agent, and an emulsifier during the stirring process to obtain a finished adhesive; S4. After filtering the finished adhesive to remove impurities through filtering equipment, the adhesive is filled through filling equipment for storage.

8. The method for preparing an adhesive for steel plates and FPCs according to claim 7, wherein: The finished adhesive should be stored at an ambient temperature of -10 to 0°C.

9. The method for preparing an adhesive for steel plates and FPCs according to claim 7, wherein: When the finished adhesive is used for false bonding, the false bonding temperature needs to be maintained at 120-140°C.

10. The method for preparing an adhesive for steel plates and FPCs according to claim 7, wherein: When the finished adhesive is used for actual bonding, the temperature of the false bonding needs to be maintained at 175-185°C.

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