UV adhesive for electronic flat cable and preparation method thereof

Abstract

The invention relates to the technical field of adhesives, in particular to a UV adhesive for an electronic flat cable and a preparation method of the UV adhesive. Comprising the following raw materials in parts by weight: 45-60 parts of polyester type polyurethane acrylate, 10-25 parts of polyether-butadiene type polyurethane acrylate, 12-25 parts of a diluent, 3-9 parts of an acrylate monomer, 1-4 parts of white carbon black, 0.5-4 parts of a silane coupling agent and 0.5-4 parts of a photoinitiator. The UV adhesive for the electronic flat cable has excellent bending resistance and environmental adaptability, and can reliably work for a long time in high and low temperature environments and high humidity environments. The preparation method of the UV adhesive for the electronic flat cable is stable in process, convenient to operate and suitable for large-scale production.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a UV adhesive for electronic ribbon cables and its preparation method. Background Technology

[0002] As an indispensable connection component in modern electronic devices, electronic ribbon cables primarily employ two connection technologies: soldering and adhesive bonding. While traditional soldering technology offers reliable connections, it has significant limitations in flexible circuit board applications: the high temperatures during the soldering process can damage heat-sensitive components, mechanical stress concentration can cause solder joint breakage, and it is difficult to adapt to the frequent bending environments of FPCs.

[0003] Existing UV adhesive technology often has the following key problems in electronic ribbon cable connections: 1. Insufficient bending resistance: Ordinary UV adhesives are difficult to achieve the ≥10,000 cycles required by FPC in dynamic bending tests, while high-end FPC applications need to meet more than 200,000 bending cycles (with resistance change rate controlled within 15%); 2. Limited environmental adaptability: Existing products are prone to performance degradation in harsh environments such as high and low temperatures and high humidity, making it difficult to meet the needs of high-end applications such as automotive electronics, and further improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a UV adhesive for electronic flat cables and its preparation method. The UV adhesive for electronic flat cables exhibits excellent bending resistance and environmental adaptability, and can operate reliably for extended periods in high and low temperature environments and high humidity environments. The preparation method of the UV adhesive for electronic flat cables is stable, easy to operate, and suitable for large-scale production.

[0005] The objective of this invention is achieved through the following technical solution: a UV adhesive for electronic ribbon cables, comprising the following raw materials in parts by weight: 45-60 parts of polyester polyurethane acrylate, 10-25 parts of polyether-butadiene polyurethane acrylate, 12-25 parts of diluent, 3-9 parts of acrylate monomer, 1-4 parts of silica, 0.5-4 parts of silane coupling agent, and 0.5-4 parts of photoinitiator.

[0006] Furthermore, the preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyester diol in proportion, add them to the reaction vessel and mix well, then add the polymerization inhibitor and catalyst, and stir well. A2. Control the reaction temperature at 70-80℃, maintain the temperature for 1-3 hours, then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A3. Add 1.5-2.5 mol of polyester diol to the reaction system and react for 1-3 hours. Then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyester-type polyurethane acrylate.

[0007] Furthermore, in step A1, the polyester diol is at least one of polyhexamethylene adipate diol and polycaprolactone diol.

[0008] Furthermore, in step A1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dineodecanate, and the amount added is 0.05-0.5 mol.

[0009] The preparation method of the polyester-type polyurethane acrylate of this invention involves the double introduction of dicyclohexylmethane diisocyanate, which helps to increase the regularity of the molecular chain and the rigidity of the structural units, thereby imparting good initial adhesive strength to the adhesive system while improving its high-temperature performance. The polyether-butadiene-type polyurethane acrylate is a polyether-hydroxyl polybutadiene composite modified polyurethane acrylate resin. Its preparation method, by introducing polyether and polybutadiene segments, helps to improve the adhesive system's resistance to high humidity, low temperature, and dynamic bending. The synergistic effect of the polyester-type polyurethane acrylate and the polyether-butadiene-type polyurethane acrylate with other raw materials gives the adhesive good resistance to high temperature and humidity, thermal shock, and dynamic bending, exhibiting excellent environmental stability.

[0010] Furthermore, the preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyether diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 70-80℃, keep the reaction temperature for 2 hours, add 1.5-2.5 mol of isophorone diisocyanate, keep the reaction temperature for 1-3 hours, then add 1.5-2.5 mol of hydroxyl polybutadiene, and continue the reaction for 1-3 hours. B3. Add 1.5-2.5 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 1.5-2.5 h; B4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

[0011] Furthermore, in step B1, the polyether diol is at least one of polytetrahydrofuran ether diol (PTMG), polypropylene oxide diol (PPG), and ethylene oxide-propylene oxide copolyether diol; the number average molecular weight of the polyether diol is 1000-3000.

[0012] Further, in step B1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dineodecanate, and the amount added is 0.05-0.5 mol.

[0013] Furthermore, the acrylate monomer is at least one of tetrahydrofuran acrylate and tetrahydrofuran methacrylate.

[0014] Furthermore, the diluent is at least one selected from isobornyl acrylate, isooctyl acrylate, and dodecyl acrylate.

[0015] Furthermore, the silane coupling agent is at least one of silane coupling agent KH550 and silane coupling agent KH570.

[0016] Furthermore, the photoinitiator is at least one of photoinitiator 184 and photoinitiator TMO.

[0017] This invention also provides a method for preparing a UV adhesive for electronic ribbon cables, comprising the following steps: by weight, polyester-type polyurethane acrylate, polyether-butadiene-type polyurethane acrylate, acrylic monomer, diluent, photoinitiator, silane coupling agent, and silica are added to a mixing container and stirred evenly to obtain a high-performance UV adhesive for electronic ribbon cables; the stirring speed is 400-800 r / min and the stirring time is 30-90 min.

[0018] The beneficial effects of this invention are as follows: The polyester-type polyurethane acrylate used in the UV adhesive for electronic ribbon cables incorporates polyester diol and dicyclohexylmethane diisocyanate multiple times, which helps improve the adhesion and high-temperature resistance of the adhesive; the polyether-butadiene-type polyurethane acrylate incorporates polyether diol and polybutene segments, which helps improve the flexibility, moisture resistance, and low-temperature resistance of the adhesive; by combining polyester-type polyurethane acrylate, polyether-butadiene-type polyurethane acrylate with silane coupling agents, acrylic monomers, and other components, this invention improves the flexibility, high and low temperature resistance, moisture resistance, and other aging properties of the UV adhesive, resulting in excellent mechanical durability. While maintaining high bonding strength, the bending life exceeds 200,000 cycles, making it suitable for the connection requirements of FPC ribbon cables in electronic devices. Its performance exceeds industry standards and has good application value. The UV adhesive preparation method is stable, easy to operate, and suitable for large-scale production. Detailed Implementation

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed; unless the manufacturer of the reagents or instruments used is specified, they are all conventional products that can be purchased commercially.

[0020] In some embodiments of the present invention, a UV adhesive for electronic ribbon cables comprises the following raw materials in parts by weight: 45-60 parts of polyester polyurethane acrylate, 10-25 parts of polyether-butadiene polyurethane acrylate, 12-25 parts of diluent, 3-9 parts of acrylate monomer, 1-4 parts of silica, 0.5-4 parts of silane coupling agent, and 0.5-4 parts of photoinitiator.

[0021] In some embodiments of the present invention, the preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyester diol in proportion, add them to the reaction vessel and mix well, then add the polymerization inhibitor and catalyst, and stir well. A2. Control the reaction temperature at 70-80℃, maintain the temperature for 1-3 hours, then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A3. Add 1.5-2.5 mol of polyester diol to the reaction system and react for 1-3 hours. Then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyester-type polyurethane acrylate.

[0022] Furthermore, in step A1, the polyester diol is at least one of polyhexamethylene adipate diol and polycaprolactone diol.

[0023] Furthermore, in step A1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dineodecanate, and the amount added is 0.05-0.5 mol.

[0024] In some embodiments of the present invention, the preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyether diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 70-80℃, keep the reaction temperature for 2 hours, add 1.5-2.5 mol of isophorone diisocyanate, keep the reaction temperature for 1-3 hours, then add 1.5-2.5 mol of hydroxyl polybutadiene, and continue the reaction for 1-3 hours. B3. Add 1.5-2.5 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 1.5-2.5 h; B4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

[0025] Furthermore, in step B1, the polyether diol is at least one of polytetrahydrofuran ether diol (PTMG), polypropylene oxide diol (PPG), and ethylene oxide-propylene oxide copolyether diol, and the number average molecular weight of the polyether diol is 1000-3000.

[0026] Further, in step B1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dineodecanate, and the amount added is 0.05-0.5 mol.

[0027] In some embodiments of the present invention, the acrylate monomer is at least one of tetrahydrofuran acrylate and tetrahydrofuran methacrylate.

[0028] In some embodiments of the present invention, the diluent is at least one selected from isobornyl acrylate, isooctyl acrylate, and dodecyl acrylate.

[0029] In some embodiments of the present invention, the silane coupling agent is at least one of silane coupling agent KH550 and silane coupling agent KH570.

[0030] In some embodiments of the present invention, the photoinitiator is at least one of photoinitiator 184 and photoinitiator TMO.

[0031] The present invention also provides a method for preparing a UV adhesive for electronic ribbon cables, comprising the following steps: by weight, polyester polyurethane acrylate, polyether-butadiene polyurethane acrylate, acrylic monomer, diluent, photoinitiator, silane coupling agent and silica are added to a mixing container and stirred at a stirring speed of 400-800 r / min for 30-90 min. After stirring evenly, a high-performance UV adhesive for electronic ribbon cables is obtained.

[0032] Example 1 In this embodiment, a UV adhesive for electronic ribbon cables comprises the following raw materials in parts by weight: 55 parts of polyester polyurethane acrylate, 15 parts of polyether-butadiene polyurethane acrylate, 18 parts of isoborneol acrylate, 6 parts of tetrahydrofuran acrylate, 2 parts of silica, 1 part of silane coupling agent, and 3 parts of photoinitiator.

[0033] Furthermore, the preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 1 mol of isophorone diisocyanate and 2 mol of polyester diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. A2. Control the reaction temperature at 75℃, maintain the temperature for 2 hours, add 2 mol of dicyclohexylmethane diisocyanate, and continue the reaction for 2 hours. A3. Add 2 mol of polyester diol to the reaction system and react for 2 h. Then add 2 mol of dicyclohexylmethane diisocyanate and continue the reaction for 2 h. A4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 2.5 h, stop heating and cool to room temperature to obtain polyester polyurethane acrylate.

[0034] Furthermore, in step A1, the polyester diol is polyhexanediol adipate, and the polyhexanediol adipate is CMA-20660 from Huada Chemical.

[0035] Furthermore, in step A1, the polymerization inhibitor is hydroquinone monomethyl ether, and the amount added is 0.02 mol; the catalyst is dibutyltin dilaurate, and the amount added is 0.03 mol.

[0036] Furthermore, the preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 1 mol of isophorone diisocyanate and 2 mol of polyether diol according to the ratio, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 75℃, keep the reaction temperature for 2 hours, add 2 mol of isophorone diisocyanate, keep the reaction temperature for 2 hours, then add 2 mol of hydroxyl polybutadiene, and continue the reaction for 2 hours; the hydroxyl polybutadiene is produced by Caoda NISSO-PBG-2000.

[0037] B3. Add 2 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 2 h; B4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 2.5 h, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

[0038] Furthermore, in step B1, the polyether diol is polytetrahydrofuran ether diol, and the polytetrahydrofuran ether diol is BASF PTMG 2000.

[0039] Furthermore, in step B1, the polymerization inhibitor is hydroquinone monomethyl ether, and the amount added is 0.02 mol; the catalyst is dibutyltin dilaurate, and the amount added is 0.03 mol.

[0040] Furthermore, the silane coupling agent is silane coupling agent KH550. The silica is A200 silica.

[0041] Furthermore, the photoinitiator is composed of photoinitiator 184 and photoinitiator TMO in a weight ratio of 4:1.

[0042] In this embodiment, the preparation method of the above-mentioned UV adhesive for electronic ribbon cables includes the following steps: by weight, polyester polyurethane acrylate, polyether-butadiene polyurethane acrylate, tetrahydrofuran acrylate, isobornyl acrylate, photoinitiator, silane coupling agent, and silica are added to a mixing container and stirred evenly to obtain a high-performance UV adhesive for electronic ribbon cables; the stirring speed is 600 r / min and the stirring time is 40 min.

[0043] Example 2 In this embodiment, a UV adhesive for electronic ribbon cables comprises the following raw materials in parts by weight: 45 parts of polyester polyurethane acrylate, 25 parts of polyether-butadiene polyurethane acrylate, 18 parts of isoborneol acrylate, 8 parts of tetrahydrofuran acrylate, 2 parts of silica, 1 part of silane coupling agent, and 3 parts of photoinitiator.

[0044] The rest of this embodiment is the same as that in Embodiment 1.

[0045] Example 3 In this embodiment, a UV adhesive for electronic ribbon cables comprises the following raw materials in parts by weight: 50 parts of polyester polyurethane acrylate, 10 parts of polyether-butadiene polyurethane acrylate, 12 parts of isoborneol acrylate, 3 parts of tetrahydrofuran acrylate, 1 part of silica, 0.5 parts of silane coupling agent, and 0.5 parts of photoinitiator.

[0046] Furthermore, the preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 1 mol of isophorone diisocyanate and 2 mol of polyester diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. A2. Control the reaction temperature at 70℃, keep the reaction at this temperature for 3 hours, add 2 mol of dicyclohexylmethane diisocyanate, and continue the reaction for 2 hours. A3. Add 2 mol of polyester diol to the reaction system and react for 2.5 h. Then add 2 mol of dicyclohexylmethane diisocyanate and continue the reaction for 2.5 h. A4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 3 h, stop heating and cool to room temperature to obtain polyester polyurethane acrylate.

[0047] Furthermore, the preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 1 mol of isophorone diisocyanate and 2 mol of polyether diol according to the ratio, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 70℃, keep the reaction at this temperature for 3 hours, add 2 mol of isophorone diisocyanate, keep the reaction at this temperature for 2 hours, then add 2 mol of hydroxyl polybutadiene, and continue the reaction for 2 hours. B3. Add 2 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 3 h; B4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 3 h, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

[0048] Furthermore, the photoinitiator is composed of photoinitiator 184 and photoinitiator TMO in a weight ratio of 3:2.

[0049] In this embodiment, the preparation method of the above-mentioned UV adhesive for electronic ribbon cables includes the following steps: by weight, polyester polyurethane acrylate, polyether-butadiene polyurethane acrylate, tetrahydrofuran acrylate, diluent, photoinitiator, silane coupling agent, and silica are added to a mixing container and stirred evenly to obtain a high-performance UV adhesive for electronic ribbon cables; the stirring speed is 400 r / min and the stirring time is 60 min.

[0050] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0051] Example 4 In this embodiment, a UV adhesive for electronic ribbon cables comprises the following raw materials in parts by weight: 60 parts of polyester polyurethane acrylate, 20 parts of polyether-butadiene polyurethane acrylate, 25 parts of dodecyl acrylate, 9 parts of tetrahydrofuran methacrylate, 4 parts of silica, 2 parts of silane coupling agent, and 4 parts of photoinitiator.

[0052] Furthermore, the preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 1 mol of isophorone diisocyanate and 2 mol of polyester diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. A2. Control the reaction temperature at 75℃, maintain the temperature for 2 hours, add 2 mol of dicyclohexylmethane diisocyanate, and continue the reaction for 2 hours. A3. Add 2 mol of polyester diol to the reaction system and react for 2 h. Then add 2 mol of dicyclohexylmethane diisocyanate and continue the reaction for 2 h. A4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 2.5 h, stop heating and cool to room temperature to obtain polyester polyurethane acrylate.

[0053] Furthermore, the preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 1 mol of isophorone diisocyanate and 2 mol of polyether diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 80℃, keep the reaction at this temperature for 1.5h, add 2mol of isophorone diisocyanate, keep the reaction at this temperature for 2h, then add 2mol of hydroxyl polybutadiene, and continue the reaction for 2h. B3. Add 2 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 2 h; B4. Add 2 mol of hydroxyethyl methacrylate to the reaction system, react for 2 h, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

[0054] Furthermore, the photoinitiator is composed of photoinitiator 184 and photoinitiator TMO in a weight ratio of 1:1.

[0055] In this embodiment, the preparation method of the above-mentioned UV adhesive for electronic ribbon cables includes the following steps: by weight, polyester polyurethane acrylate, polyether-butadiene polyurethane acrylate, acrylic monomer, dodecyl acrylate, photoinitiator, silane coupling agent, and silica are added to a mixing container and stirred evenly to obtain a high-performance UV adhesive for electronic ribbon cables; the stirring speed is 800 r / min and the stirring time is 30 min.

[0056] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0057] Comparative Example 1 The difference between this comparative example and Example 1 is that: in this comparative example, a UV adhesive for electronic ribbon cables includes the following raw materials in parts by weight: 70 parts of polyester polyurethane acrylate, 18 parts of isobornyl acrylate, 6 parts of tetrahydrofuran acrylate, 2 parts of silica, 1 part of silane coupling agent, and 3 parts of photoinitiator.

[0058] Comparative Example 2 The difference between this comparative example and Example 1 is that: in this comparative example, there are 55 parts of polycarbonate diol modified polyurethane acrylate, 15 parts of polyether-butadiene type polyurethane acrylate, 18 parts of isobornyl acrylate, 6 parts of tetrahydrofuran acrylate, 2 parts of silica, 1 part of silane coupling agent, and 3 parts of photoinitiator.

[0059] The preparation method of the polycarbonate diol modified polyurethane acrylate includes the following steps: 1 mol of isophorone diisocyanate and 2 mol of polycarbonate diol (Jiangsu Chemical Research Institute JSB20) are added to a reaction vessel and mixed evenly. 0.02 mol of hydroquinone monomethyl ether and 0.03 mol of dibutyltin dilaurate are added, and the mixture is reacted at 75°C for 2 h. Then, 2 mol of dicyclohexylmethane diisocyanate is added and reacted for 2 h. Finally, 2 mol of hydroxyethyl methacrylate is added and reacted for 2.5 h. After cooling, the polycarbonate diol modified polyurethane acrylate is obtained.

[0060] The electronic ribbon cables prepared in Examples 1-2 and Comparative Examples 1-2 were uniformly coated with UV adhesive at the connection points of the FPC ribbon cables and then UV cured. The adhesive layer thickness was controlled at 0.3 mm. Performance tests were conducted, and the results are shown in Table 1 below. The Shore D hardness of the UV adhesive for electronic ribbon cables prepared in this invention was tested according to ASTM D2240. The room temperature shear strength (PC / PC) was tested according to ISO 4587; the thermal shock shear strength (PC / PC) was tested as follows: after 500 hours of thermal shock at -40℃ to 80℃, it was tested according to ISO 4587; the high temperature and high humidity shear strength (PC / PC) was tested as follows: after aging in an environment of 85℃ and 85% RH for 500 hours, it was tested according to ISO 4587. The bending test method was as follows: on an FPC bending tester, the bending angle was 180°, R=3.0mm, and the test frequency was 50 times / min. The number of cycles until the resistance change rate was >15% was recorded. Before and after the bending test, the resistance at the connection point of the electronic ribbon cable was measured with a multimeter, and the change rate was calculated.

[0061] In summary, the UV adhesive for electronic flat cables prepared by this invention is a UV curing system with excellent bending resistance, adaptable to the dynamic use environment of FPC, and also has good environmental adaptability, ensuring long-term reliable operation in a temperature range of -40℃ to 80℃ and a humidity of 85%RH.

[0062] The specific embodiments described above are further illustrations of the technical solution and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A UV adhesive for electronic ribbon cables, characterized in that: The raw materials include the following parts by weight: 45-60 parts of polyester polyurethane acrylate, 10-25 parts of polyether-butadiene polyurethane acrylate, 12-25 parts of diluent, 3-9 parts of acrylate monomer, 1-4 parts of silica, 0.5-4 parts of silane coupling agent, and 0.5-4 parts of photoinitiator.

2. The UV adhesive for electronic ribbon cables according to claim 1, characterized in that: The preparation method of the polyester-type polyurethane acrylate includes the following steps: A1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyester diol in proportion, add them to the reaction vessel and mix well, then add the polymerization inhibitor and catalyst, and stir well. A2. Control the reaction temperature at 70-80℃, maintain the temperature for 1-3 hours, then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A3. Add 1.5-2.5 mol of polyester diol to the reaction system and react for 1-3 hours. Then add 1.5-2.5 mol of dicyclohexylmethane diisocyanate and continue the reaction for 1-3 hours. A4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyester-type polyurethane acrylate.

3. The UV adhesive for electronic ribbon cables according to claim 2, characterized in that: In step A1, the polyester diol is at least one of polyhexamethylene adipate diol and polycaprolactone diol.

4. The UV adhesive for electronic ribbon cables according to claim 2, characterized in that: In step A1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dineodecanate, and the amount added is 0.05-0.5 mol.

5. The UV adhesive for electronic ribbon cables according to claim 1, characterized in that: The preparation method of the polyether-butadiene type polyurethane acrylate includes the following steps: B1. Take 0.5-1.5 mol of isophorone diisocyanate and 1.5-2.5 mol of polyether diol, add them to the reaction vessel and mix well. Then add the polymerization inhibitor and catalyst and stir well. B2. Control the reaction temperature at 70-80℃, keep the reaction temperature for 2 hours, add 1.5-2.5 mol of isophorone diisocyanate, keep the reaction temperature for 1-3 hours, then add 1.5-2.5 mol of hydroxyl polybutadiene, and continue the reaction for 1-3 hours. B3. Add 1.5-2.5 mol of dicyclohexylmethane diisocyanate to the reaction system and react for 1.5-2.5 h; B4. Add 1.5-2.5 mol of hydroxyethyl methacrylate to the reaction system, react for 2-3 hours, stop heating and cool to obtain polyether-butadiene type polyurethane acrylate.

6. The UV adhesive for electronic ribbon cables according to claim 5, characterized in that: In step B1, the polyether diol is at least one of polytetrahydrofuran ether diol, polypropylene oxide diol, and ethylene oxide-propylene oxide copolyether diol.

7. The UV adhesive for electronic ribbon cables according to claim 5, characterized in that: In step B1, the polymerization inhibitor is at least one of hydroquinone monomethyl ether, hydroquinone, and 2,6-di-tert-butyl-p-cresol, and the amount added is 0.005-0.05 mol; the catalyst is at least one of dibutyltin dilaurate and dibutyltin dinecidate, and the amount added is 0.05-0.5 mol.

8. The UV adhesive for electronic ribbon cables according to claim 1, characterized in that: The acrylate monomer is at least one of tetrahydrofuran acrylate and tetrahydrofuran methacrylate.

9. The UV adhesive for electronic flat cables according to claim 1, characterized in that: The diluent is at least one of isobornyl acrylate, isooctyl acrylate, and dodecyl acrylate.

10. The method for preparing the UV adhesive for electronic ribbon cables according to any one of claims 1-9, characterized in that: Includes the following steps: By weight, polyester-type polyurethane acrylate, polyether-butadiene-type polyurethane acrylate, acrylic monomer, diluent, photoinitiator, silane coupling agent, and silica are added to a mixing container and stirred evenly to obtain a high-performance UV adhesive for electronic ribbon cables.

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