Manufacturing process of a conductive silicone synthetic leather

Abstract

The present application discloses a manufacturing process of a conductive silicone synthetic leather, which relates to the technical field of conductive materials and includes the following steps: Step 1, base coating: Coat a sizing material on a release paper at intervals to form a coated sizing layer; Step 2, base drying: Take a fabric and attach it to the coated sizing layer, then perform a heating and drying treatment, and peel off the release paper after the drying treatment is completed to obtain a base material; Step 3, pattern coating: Coat a conductive sizing material on the coated sizing layer of the base material to form a required circuit pattern and obtain a circuit pattern blank; Step 4, pattern drying: Dry the circuit pattern blank to obtain a conductive silicone synthetic leather; the viscosity of the sizing material is 10 5 -8*10 5 CPS, and the viscosity of the conductive sizing material is 0.5*10 4 -10 4 CPS. The present application has the effects of reducing the process difficulty and improving the mechanical properties.

Description

Technical Field

[0001] This application relates to the technical field of conductive materials, and particularly to a manufacturing process for conductive silicone synthetic leather. Background Art

[0002] As a popular synthetic innovation variety nowadays, silicone synthetic leather has natural characteristics such as hydrolysis resistance, stain resistance, and weather resistance. Especially its solvent-free manufacturing technology avoids the phenomenon of a large amount of emissions of organic solvents and plasticizers such as DMF and MEK in polyurethane synthetic leather and PVC artificial leather. Therefore, it has received relatively high attention in recent years. However, although it has obvious advantages compared with traditional leather materials, it also has some relatively significant disadvantages. For example, the bulk resistance of silicone materials is very high, generally 1016 Ω*m, belonging to insulating materials. Therefore, using it as the surface material of synthetic leather has disadvantages such as high surface resistance, large static electricity, and easy dust absorption.

[0003] In the prior art, to make silicone synthetic leather conductive, it is necessary to reduce the resistance value of the silicone synthetic leather, and generally, the conductivity of the silicone synthetic leather is improved by adding conductive materials such as metal powder, conductive carbon black, and antistatic agents.

[0004] However, after adding conductive materials, it will seriously affect the overall mechanical structure of the silicone synthetic leather, and the high-temperature resistance performance is reduced, and the curing efficiency is slow, resulting in the problems of difficult synthesis and preparation of the silicone synthetic leather and a small range of application scenarios, which need to be improved. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a manufacturing process for conductive silicone synthetic leather to achieve the purpose of reducing the process difficulty and improving the mechanical properties. The specific scheme is as follows:

[0006] A manufacturing process for conductive silicone synthetic leather includes the following steps:

[0007] Step 1, base coating: Coat a sizing material on the release paper at intervals to form a coated sizing layer;

[0008] Step 2, base drying: Take a fabric and attach it to the coated sizing layer, then heat and dry it, and peel off the release paper after the drying process is completed to obtain a base material;

[0009] Step 3, pattern coating: Coat a conductive sizing material on the coated sizing layer of the base material to form a required circuit pattern, and obtain a circuit pattern blank;

[0010] Step 4, pattern drying: Dry the circuit pattern blank to obtain conductive silicone synthetic leather;

[0011] The viscosity of the coated sizing material is 10 5-8*10 5 CPS, and the viscosity of the conductive adhesive is 0.5*10 4 -10 4 CPS.

[0012] Preferably: in step 1, the release paper is a high-temperature resistant textured release paper; and a gap coater is used to coat the adhesive on the textured release paper with a gap, and the thickness of the coated adhesive is 0.01 - 0.05 mm, and the coating speed is 6 m / min.

[0013] Preferably: in steps 2 and 4, drying is carried out using a heat transfer oil oven, and the heat transfer oil oven is heated to 140 - 160 °C by a circulating fan, and the drying time is 1.5 min.

[0014] Preferably: in step 3, a mounting process, a gravure process, a rotary screen process or a printing process is used to coat the conductive adhesive on the coated adhesive layer of the base material to form the required circuit pattern.

[0015] Preferably: the coated adhesive is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor is 100:10 - 20:1 - 5:0.03 - 1.

[0016] Preferably: the hydrogen-containing silicone oil is end-methyl side hydrogen-containing silicone oil, and the hydrogen content is 0.12 - 0.25%; the platinum catalyst is chloroplatinic acid-isopropanol complex or a highly active catalyst of the Karstedt type; the inhibitor is ethynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol or methylbutynol.

[0017] Preferably: the conductive adhesive is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica and conductive material, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica and conductive material is 10 - 30:60 - 80:1 - 5:0.03 - 1:2 - 5:20 - 50.

[0018] Preferably: the hydrogen-containing silicone oil is end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.12 - 0.25%; the platinum catalyst is chloroplatinic acid-isopropanol complex or a highly active catalyst of the Karstedt type; the inhibitor is ethynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol or methylbutynol; the conductive material is an active group modified material, and the preparation method of the active group modified material is to dissolve a silane with an active group in ethanol to form a modified solution, and place the conductive raw material in a stirring kettle at a temperature of 80 - 120 °C and stir, then spray the modified solution into the stirring kettle, control the mass ratio of the modified solution to the conductive raw material in the stirring kettle to be 0.2 - 2:25, and then raise the temperature to 120 - 140 °C for drying to obtain the active group modified material.

[0019] Preferably: the silane with an active group is one of tetrakis(dimethylsiloxy)silane, 3-glycidoxypropyltrimethoxysilane, allyldimethylchlorosilane and phenyltriethoxysilane; the conductive raw material is graphite, graphene or metal conductive powder, and the particle size of the conductive raw material is 800 - 2000 mesh.

[0020] Preferably: it further includes a modified methyl vinyl MQ resin with a weight ratio of 60 - 80:0.3 - 1 to the hydrogen-containing silicone oil, and the vinyl content is 0.5 - 1.8%; the molecular formula of the modified methyl vinyl MQ resin is:

[0021] (CH3) 2 (CH2=CH)Si0 1 / 2 a [(CH3) 2 XSi0 1 / 2 b [Si0 4 / 2 c

[0022] Among them, (a + b) / c = 0.6 - 1; X is vinylbenzylaminoethylaminopropyltrimethoxysilyl; and the preparation process of the modified methyl vinyl MQ resin includes first mixing methyl vinyl MQ resin, 38% concentrated hydrochloric acid and toluene, heating to 55 °C and stirring, after stirring evenly, adding vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water and reacting for 1 - 2 h, then adding an alkali solution to adjust the PH to 6.5, filtering and extracting to obtain a mixed solution of the modified methyl vinyl MQ resin and toluene; then dropping vinyl silicone with a mass ratio of 3:1 - 2 into the mixed solution and stirring for 1 - 2 h, and then heating to 120 - 130 °C to distill out toluene to obtain the modified methyl vinyl MQ resin.

[0023] ​​​As can be seen from the above solution, the present application provides a manufacturing process for a conductive silicone synthetic leather, and this manufacturing process for the conductive silicone synthetic leather has the following beneficial effects:

[0024] 1. By applying a coating compound with a viscosity of 10 5 -8*10 5 CPS on the release paper with a gap coating of the coating compound, and then drying to peel off the release paper to obtain a base material, and further applying a conductive compound with a viscosity of 0.5*10 4 -10 4 CPS at a set position on the base material to coat the required circuit pattern, a circuit loop can be formed, achieving the purpose of reducing wire layout;

[0025] 2. By adjusting the weight ratio of the active group modified material in the conductive compound, the purpose of obtaining conductive silicone synthetic leather with different resistivity can be achieved, so as to be applicable to the use of strong and weak currents;

[0026] 3. By combining the drying function of the heat transfer oil oven, the intermittent coating function of the gap coater, and any one of the processes of mounting process, gravure process, rotary screen process, and printing process, when combining with this manufacturing process for the conductive silicone synthetic leather, the operation difficulty of this manufacturing process can be significantly reduced, and the purpose of effectively improving the operation efficiency and the forming effect of the conductive silicone synthetic leather can be achieved;

[0027] 4. By modifying the conductive raw material to obtain a conductive material with active groups, that is, an active group modified material, adding it as a conductive material to the conductive compound to play the role of conductivity, making the conductive material adhere and crosslink with vinyl siloxane, hydrogen-containing silicone oil, fumed silica, and modified methyl vinyl MQ resin into one body, and effectively avoiding the problem that the overall mechanical structure of the conductive silicone synthetic leather is affected due to the difficulty of fusion between the conductive raw material and vinyl siloxane, hydrogen-containing silicone oil, fumed silica, and modified methyl vinyl MQ resin, and achieving the purpose of improving the high-temperature resistance and the curing efficiency, reducing the synthesis and preparation difficulty of the conductive silicone synthetic leather, and expanding the range of use scenarios;

[0028] 5. By preparing modified methyl vinyl MQ resin, and then using the modified methyl vinyl MQ resin as one of the components of the conductive silicone synthetic leather, the connection tightness between the active group modified material obtained after the modification treatment of the conductive raw material in the conductive silicone synthetic leather and vinyl siloxane, hydrogen-containing silicone oil, and fumed silica can be significantly improved, so that while the above components have a tightly connected effect, a stable bonding structure is formed with the base material after mixing and coating, thereby significantly improving the bonding strength of the conductive silicone synthetic leather. Specific embodiments

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0030] It should be noted that the following will specifically describe the conductive silicone synthetic leather of the present application.

[0031] A manufacturing process of a conductive silicone synthetic leather includes the following steps:

[0032] Step 1, base coating: Coat a sizing material on the release paper at intervals to form a coating layer. The sizing material is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor is 100:10 - 20:1 - 5:0.03 - 1 to form a coating layer;

[0033] Step 2, base drying: Take a fabric and attach it to the coating layer, then perform a heat drying treatment, and peel off the release paper after the drying treatment is completed to obtain a base material;

[0034] Step 3, pattern coating: Coat a conductive sizing material on the coating layer of the base material. The conductive sizing material is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica and conductive material, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica and conductive material is 10 - 30:60 - 80:1 - 5:0.03 - 1:2 - 5:20 - 50 to form the required circuit pattern and obtain a circuit pattern blank;

[0035] Step 4, pattern drying: Dry the circuit pattern blank to obtain the conductive silicone synthetic leather.

[0036] Among them, the viscosity of the sizing material is 10 5 -8*10 5 CPS, and the viscosity of the conductive sizing material is 0.5*10 4 -10 4 CPS. Therefore, by coating the sizing material with a viscosity of 10 5 -8*10 5 CPS on the release paper at intervals, drying and then peeling off the release paper to obtain a base material, and further coating the conductive sizing material with a viscosity of 0.5*10 4 -10 4The conductive adhesive of the CPS can be coated on the set position of the base material to form the required circuit pattern, thus forming a circuit loop and achieving the purpose of reducing wire layout. And when adjusting the weight ratio of the active group modifying material in the conductive adhesive, the purpose of obtaining conductive silicone synthetic leather with different resistivity can be achieved, so as to be applicable to the use of strong and weak currents.

[0037] It should be noted that the release paper used in Step 1 is a high-temperature resistant textured release paper, which can achieve the purpose of high-temperature resistance and forming corresponding textures on the base material. And by using an intermittent coater to coat the adhesive on the textured release paper at intervals, while reducing the difficulty of intermittent coating, the purpose of stably producing the base material can be achieved by controlling the thickness of the coated adhesive to be 0.01 - 0.05 mm and the coating speed to be 6 m / min.

[0038] Meanwhile, the drying steps in Step 2 and Step 4 are both implemented using a heat-conducting oil oven, and when the heat-conducting oil oven is implementing the drying operation, it is heated to 140 - 160 °C by a circulating fan, and a drying time of 1.5 min is used in both cases. In Step 3, in order to further reduce the manufacturing process difficulty and obtain the required circuit pattern to complete the production of the conductive silicone synthetic leather, a mounting process, a gravure process, a rotary screen process or a printing process is used to coat the conductive adhesive on the coated adhesive layer of the base material to form the required circuit pattern.

[0039] Regarding the specific composition of the coated adhesive and the conductive adhesive, the hydrogen-containing silicone oil is end-methyl side hydrogen-containing silicone oil, and the hydrogen content is 0.12 - 0.25%; the platinum catalyst is chloroplatinic acid-isopropanol complex or a high-activity catalyst of the Karstedt type; the inhibitor is ethynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol or methylbutynol. And for the specific composition in the coated adhesive and the conductive adhesive, different materials or the same materials are suitable for selection.

[0040] In addition, the conductive material included in the conductive adhesive is also an active group modifying material, and the preparation method of the active group modifying material is to dissolve the silane with an active group in ethanol to form a modified solution. The silane with an active group is one of tetrakis(dimethylsiloxy)silane, 3-glycidoxypropyltrimethoxysilane, allyldimethylchlorosilane and phenyltriethoxysilane; and the conductive raw material is placed in a stirring kettle at a temperature of 80 - 120 °C and stirred, and the conductive raw material is graphite, graphene or metal conductive powder with a particle size of 800 - 2000 mesh; then the modified solution is sprayed into the stirring kettle, and the mass ratio of the modified solution to the conductive raw material in the stirring kettle is controlled to be 0.2 - 2:25, and then it is heated to 120 - 140 °C for drying to obtain the active group modifying material.

[0041] Correspondingly, the conductive adhesive compound further includes a modified methyl vinyl MQ resin with a weight ratio of 60-80:0.3-1 to the hydrogen-containing silicone oil. The vinyl content in the modified methyl vinyl MQ resin is 0.5-1.8%; and the molecular formula of the modified methyl vinyl MQ resin is:

[0042] (CH3) 2 (CH2=CH)Si0 1 / 2 a [(CH3) 2 XSi0 1 / 2 b [Si0 4 / 2 c

[0043] wherein, (a + b) / c = 0.6-1; X is vinylbenzylaminoethylaminopropyltrimethoxysilane.

[0044] The preparation process of the modified methyl vinyl MQ resin includes first mixing methyl vinyl MQ resin, 38% concentrated hydrochloric acid, and toluene, heating to 55°C and stirring. After stirring evenly, vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water are added and reacted for 1-2 hours. Then, an alkali solution is added to adjust the pH to 6.5, and filtration and extraction are performed to obtain a mixed solution of the modified methyl vinyl MQ resin and toluene. Then, vinyl silicone with a mass ratio of 3:1-2 is added dropwise to the mixed solution, stirred for 1-2 hours, and then heated to 120-130°C to distill out toluene to obtain the modified methyl vinyl MQ resin. Therefore, the modified methyl vinyl MQ resin is used as one of the components of the conductive silicone synthetic leather, thereby significantly improving the connection tightness between the active group modified material obtained after modification of the conductive raw material in the conductive silicone synthetic leather and vinyl siloxane, hydrogen-containing silicone oil, and fumed silica. While the above components have a tightly connected effect, a stable bonding structure is formed with the substrate material after mixing and coating, thereby significantly improving the bonding strength of the conductive silicone synthetic leather.

[0045] Example 1

[0046] A manufacturing process for a conductive silicone synthetic leather includes the following steps:

[0047] Step 1, substrate gluing: Coating the adhesive compound at intervals on the release paper. The coating adhesive compound consists of vinyl siloxane, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.25%, chloroplatinic acid-isopropanol complex, and ethynylcyclohexanol, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, chloroplatinic acid-isopropanol complex, and ethynylcyclohexanol is 100:10:1:0.03 to form a coating adhesive layer;

[0048] ​​​Step 2, drying the substrate: Place the fabric on the coated adhesive layer, then heat and dry it, and peel off the release paper after the drying process to obtain the substrate material;

[0049] Step 3, pattern coating: Coat a conductive adhesive on the coated adhesive layer of the substrate material. The conductive adhesive is composed of vinyl siloxane, terminal methyl side hydrogen-containing silicone oil with a hydrogen content of 0.12%, a highly active Kaster-type catalyst, methyl butynol, fumed silica, and an active group modification material. The weight ratio of vinyl siloxane, hydrogen-containing silicone oil, Kaster-type highly active catalyst, methyl butynol, fumed silica, and active group modification material is 10:60:1:0.03:2:20 to form the required circuit pattern and obtain the circuit pattern blank;

[0050] Step 4, pattern drying: Dry the circuit pattern blank to obtain the conductive silicone synthetic leather.

[0051] Among them, the viscosity of the coating adhesive is 10 5 -8*10 5 CPS, and the viscosity of the conductive adhesive is 0.5*10 4 -10 4 CPS. Therefore, by gap-coating the coating adhesive with a viscosity of 10 5 -8*10 5 CPS on the release paper, drying and then peeling off the release paper to obtain the substrate material, and further coating the required circuit pattern at a set position on the substrate material with the conductive adhesive with a viscosity of 0.5*10 4 -10 4 CPS can form a circuit loop, achieving the purpose of reducing wire layout. And by adjusting the weight ratio value of the active group modification material in the conductive adhesive, the purpose of obtaining conductive silicone synthetic leather with different resistivity can be achieved, so as to be applicable to the use of strong and weak currents.

[0052] It should be noted that the release paper used in Step 1 is a high-temperature resistant textured release paper, which has achieved the purpose of high-temperature resistance and forming corresponding textures on the substrate material. And by using an intermittent coater to gap-coat the coating adhesive on the textured release paper, while reducing the difficulty of gap coating, by controlling the thickness of the coating adhesive to be 0.05 mm and the coating speed to be 6 m / min, the purpose of stably producing the substrate material is achieved.

[0053] Meanwhile, the drying steps in Step 2 and Step 4 are both implemented using a heat-conducting oil oven. When the heat-conducting oil oven is performing the drying operation, it is heated to 140°C by a circulating fan, and a drying time of 1.5 minutes is sufficient for both. In Step 3, in order to further reduce the manufacturing process difficulty and obtain the required circuit pattern to complete the production of the conductive silicone synthetic leather, a sizing process is thus adopted to coat a conductive compound on the coated adhesive layer of the base material to form the required circuit pattern.

[0054] The preparation method of the active group-modified material is to dissolve a silane with an active group in ethanol to form a modified solution. The silane with an active group is tetra(bis(dimethylsiloxy)silane), and to place the conductive raw material in a stirring kettle at a temperature of 80°C and stir. The conductive raw material is alumina with a particle size of 800 mesh. Then, the modified solution is sprayed into the stirring kettle, and the mass ratio of the modified solution to the conductive raw material in the stirring kettle is controlled to be 0.2:25, and then heated to 120°C for drying to obtain the active group-modified material.

[0055] Correspondingly, the conductive compound also includes a modified methyl vinyl MQ resin with a weight ratio of 60:0.3 to the hydrogen-containing silicone oil. The vinyl content in the modified methyl vinyl MQ resin is 0.5%; and the molecular formula of the modified methyl vinyl MQ resin is:

[0056] (CH3) 2 (CH2=CH)Si0 1 / 2 a [(CH3) 2 XSi0 1 / 2 b [Si0 4 / 2 c

[0057] Among them, (a + b) / c = 0.6; X is vinylbenzylaminoethylaminopropyltrimethoxysilane.

[0058] ​​​The preparation process of the modified methyl vinyl MQ resin includes first mixing the methyl vinyl MQ resin, 38% hydrochloric acid, and toluene, heating the mixture to 55°C and stirring. After stirring evenly, vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water are added and the reaction is carried out for 1 h. Then, an alkali solution is added to adjust the pH to 6.5, and filtration and extraction are performed to obtain a mixed solution of the modified methyl vinyl MQ resin and toluene. Then, vinyl silicone with a mass ratio of 3:1 is added dropwise to the mixed solution, and after stirring for 1 h, the temperature is raised to 120°C to distill out toluene, obtaining the modified methyl vinyl MQ resin. Therefore, the modified methyl vinyl MQ resin is used as one of the components of the conductive silicone synthetic leather, which significantly improves the connection tightness between the active group modified materials obtained after the modification of the conductive raw materials in the conductive silicone synthetic leather and vinyl silicone, hydrogen-containing silicone oil, and fumed silica. While the above components have a tightly connected effect, a stable bonding structure is formed with the substrate material after mixing and coating, thus significantly improving the bonding strength of the conductive silicone synthetic leather.

[0059] Example Two

[0060] A manufacturing process of a conductive silicone synthetic leather includes the following steps:

[0061] Step 1, substrate gluing: Coating a sizing material on the release paper at intervals. The sizing material consists of vinyl silicone, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.25%, a Karstedt-type highly active catalyst, and 3,5-dimethyl-1-hexyne-3-ol, and the vinyl silicone, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.25%, the Karstedt-type highly active catalyst, and 3,5-dimethyl-1-hexyne-3-ol are in a weight ratio of 100:15:3:0.5 to form a coating layer.

[0062] Step 2, substrate drying: Taking a fabric and laminating it on the coating layer, then performing a heat drying treatment, and peeling off the release paper after the drying treatment is completed to obtain a substrate material.

[0063] Step 3, pattern gluing: Coating a conductive sizing material on the coating layer of the substrate material. The conductive sizing material consists of vinyl silicone, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.18%, chloroplatinic acid-isopropanol complex, 3,5-dimethyl-1-hexyne-3-ol, fumed silica, and an active group modified material, and the vinyl silicone, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.18%, chloroplatinic acid-isopropanol complex, 3,5-dimethyl-1-hexyne-3-ol, fumed silica, and the active group modified material are in a weight ratio of 20:70:3:0.5:3:40 to form the required circuit pattern and obtain a circuit pattern blank.

[0064] Step 4, Pattern drying: Dry the circuit pattern blank to obtain the conductive silicone synthetic leather.

[0065] Among them, the viscosity of the coating compound is 10 5 -8 * 10 5 CPS, and the viscosity of the conductive compound is 0.5 * 10 4 -10 4 CPS. Therefore, by applying the coating compound with a viscosity of 10 5 -8 * 10 5 CPS on the release paper by gap coating the coating compound, and then drying and peeling off the release paper, the base material is obtained. Further, by applying the conductive compound with a viscosity of 0.5 * 10 4 -10 4 CPS at the set position on the base material, the required circuit pattern can be coated to form a circuit loop, achieving the purpose of reducing wire layout. And by adjusting the weight ratio of the active group modifying material in the conductive compound, the purpose of obtaining conductive silicone synthetic leather with different resistivity can be achieved, so as to be suitable for the use of strong and weak currents.

[0066] It should be noted that the release paper used in Step 1 is a high-temperature resistant textured release paper, which has achieved the purpose of high-temperature resistance and forming corresponding textures on the base material. And by using an intermittent coater to coat the coating compound on the textured release paper by intermittent coating, while reducing the difficulty of intermittent coating, by controlling the thickness of the coating compound to be 0.03 mm and the coating speed to be 6 m / min, the purpose of stably producing the base material is achieved.

[0067] At the same time, the drying steps in Step 2 and Step 4 are both implemented by a heat-conducting oil oven. When the heat-conducting oil oven implements the drying operation, it is heated to 150 °C by a circulating fan, and the drying time is 1.5 min. In Step 3, in order to further reduce the manufacturing process difficulty and obtain the required circuit pattern to complete the production of the conductive silicone synthetic leather, an intaglio process is used to coat the conductive compound on the coating layer of the base material to form the required circuit pattern.

[0068] The preparation method of the active group modifying material is to dissolve the silane with active groups in ethanol to form a modified solution. The silane with active groups is allyldimethylchlorosilane; and place the conductive raw material in a stirring kettle at a temperature of 100 °C and stir. The conductive raw material is graphene with a particle size of 1200 mesh; then spray the modified solution into the stirring kettle, control the mass ratio of the modified solution to the conductive raw material in the stirring kettle to be 1:25, and then heat to 130 °C and dry to obtain the active group modifying material.

[0069] Correspondingly, the conductive adhesive compound further includes a modified methyl vinyl MQ resin having a weight ratio of 70:0.6 to the hydrogen-containing silicone oil. The vinyl content in the modified methyl vinyl MQ resin is 1.2%; and the molecular formula of the modified methyl vinyl MQ resin is:

[0070] (CH3) 2 (CH2=CH)Si0 1 / 2 a [(CH3) 2 XSi0 1 / 2 b [Si0 4 / 2 c

[0071] wherein, (a + b) / c = 0.8; X is vinylbenzylaminoethylaminopropyltrimethoxysilane.

[0072] The preparation process of the modified methyl vinyl MQ resin includes first mixing methyl vinyl MQ resin, 38% concentrated hydrochloric acid, and toluene, then heating to 55°C and stirring. After stirring evenly, vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water are added and reacted for 1.5 h. Then, an alkali solution is added to adjust the pH to 6.5, and the modified methyl vinyl MQ resin and toluene mixed solution is obtained by filtration and extraction; then, vinyl silicone oil with a mass ratio of 2:1 is added dropwise to the mixed solution and stirred for 1.5 h, and then heated to 125°C to distill out toluene to obtain the modified methyl vinyl MQ resin. Therefore, the modified methyl vinyl MQ resin is used as one of the components of the conductive silicone synthetic leather, thereby significantly improving the connection tightness between the active group modified material obtained after modification of the conductive raw material in the conductive silicone synthetic leather and vinyl silicone oil, hydrogen-containing silicone oil, and fumed silica. While the above components have a tightly connected effect, a stable bonding structure is formed with the substrate material after mixing and coating, thereby significantly improving the bonding strength of the conductive silicone synthetic leather.

[0073] Example 3

[0074] A manufacturing process of a conductive silicone synthetic leather includes the following steps:

[0075] Step 1, substrate gluing: Coating the adhesive compound at intervals on the release paper to form a coating adhesive layer. The coating adhesive compound is composed of vinyl silicone oil, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.12%, chloroplatinic acid-isopropanol complex, and 3,5-dimethyl-1-hexyne-3-ol, and the weight ratio of vinyl silicone oil, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.12%, chloroplatinic acid-isopropanol complex, and 3,5-dimethyl-1-hexyne-3-ol is 100:20:5:1.

[0076] ​​​Step 2, Base drying: Take the fabric and attach it to the coated adhesive layer, then heat and dry it, and after the drying process is completed, peel off the release paper to obtain the base material;

[0077] Step 3, Pattern coating: Coat the conductive adhesive on the coated adhesive layer of the base material. The conductive adhesive is composed of vinyl siloxane, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.22%, chloroplatinic acid-isopropanol complex, methyl butynol, fumed silica, and active group modified material. And the weight ratio of vinyl siloxane, end-methyl side hydrogen-containing silicone oil with a hydrogen content of 0.22%, chloroplatinic acid-isopropanol complex, methyl butynol, fumed silica, and active group modified material is 30:80:5:1:5:50 to form the required circuit pattern and obtain the circuit pattern blank;

[0078] Step 4, Pattern drying: Dry the circuit pattern blank to obtain the conductive silicone synthetic leather.

[0079] Among them, the viscosity of the coated adhesive is 10 5 -8*10 5 CPS, and the viscosity of the conductive adhesive is 0.5*10 4 -10 4 CPS. Therefore, by gap-coating the coated adhesive with a viscosity of 10 5 -8*10 5 CPS on the release paper, drying and then peeling off the release paper to obtain the base material, and further coating the conductive adhesive with a viscosity of 0.5*10 4 -10 4 CPS at the set position on the base material to coat the required circuit pattern, a circuit loop can be formed, achieving the purpose of reducing wire layout. And by adjusting the weight ratio value of the active group modified material in the conductive adhesive, the purpose of obtaining conductive silicone synthetic leather with different resistivity can be achieved, so as to be suitable for the use of strong and weak currents.

[0080] It should be mentioned that the release paper used in Step 1 is a high-temperature resistant textured release paper, which has achieved the purpose of high-temperature resistance and forming corresponding textures on the base material. And by using an intermittent coater to gap-coat the coated adhesive on the textured release paper, while reducing the difficulty of gap coating, by controlling the thickness of the coated adhesive to be 0.05 mm and the coating speed to be 6 m / min, the purpose of stably producing the base material can be achieved.

[0081] Meanwhile, the drying steps in both Step 2 and Step 4 are implemented using a heat-conducting oil oven. When the heat-conducting oil oven conducts the drying operation, it is heated to 160 °C by a circulating fan, and a drying time of 1.5 minutes is sufficient for both. In Step 3, in order to further reduce the manufacturing process difficulty and obtain the required circuit pattern to complete the production of the conductive silicone synthetic leather, a screen printing process is used to coat the conductive paste on the coated adhesive layer of the base material to form the required circuit pattern.

[0082] The preparation method of the active group-modified material is to dissolve the silane with active groups in ethanol to form a modified solution. The silane with active groups is phenyltriethoxysilane; and place the conductive raw material in a stirring kettle at a temperature of 120 °C and stir. The conductive raw material is graphite with a particle size of 2000 mesh; then spray the modified solution into the stirring kettle, control the mass ratio of the modified solution to the conductive raw material in the stirring kettle to be 2:25, and then raise the temperature to 140 °C for drying to obtain the active group-modified material.

[0083] Correspondingly, the conductive paste also includes a modified methyl vinyl MQ resin with a weight ratio of 80:1 to the hydrogen-containing silicone oil. The vinyl content in the modified methyl vinyl MQ resin is 1.8%; and the molecular formula of the modified methyl vinyl MQ resin is:

[0084] (CH3) 2 (CH2=CH)Si0 1 / 2 a [(CH3) 2 XSi0 1 / 2 b [Si0 4 / 2 c

[0085] Among them, (a + b) / c = 1; X is vinylbenzylaminoethylaminopropyltrimethoxysilyl.

[0086] ​​​The preparation process of the modified methyl vinyl MQ resin includes first mixing the methyl vinyl MQ resin, 38% concentrated hydrochloric acid, and toluene, then heating to 55°C and stirring. After stirring evenly, vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water are added and reacted for 2 hours. Then, an alkali solution is added to adjust the pH to 6.5, and filtration and extraction are carried out to obtain a mixed solution of the modified methyl vinyl MQ resin and toluene. Then, vinyl silicone with a mass ratio of 3:2 is added dropwise to the mixed solution, stirred for 2 hours, and then heated to 130°C to distill out toluene, obtaining the modified methyl vinyl MQ resin. Therefore, the modified methyl vinyl MQ resin is used as one of the components of the conductive silicone synthetic leather, which significantly improves the connection tightness between the active group modified material obtained after the modification treatment of the conductive raw material in the conductive silicone synthetic leather and vinyl silicone, hydrogen-containing silicone oil, and fumed silica. While the above components have a tightly connected effect, a stable bonding structure is formed with the substrate material after mixing and coating, thereby significantly improving the bonding strength of the conductive silicone synthetic leather.

[0087] Comparative Example 1

[0088] The difference between Comparative Example 1 and Example 1 is that the modified methyl vinyl MQ resin is not added.

[0089] Comparative Example 2

[0090] The difference between Comparative Example 2 and Comparative Example 1 is that methyl vinyl MQ resin is added.

[0091] Comparative Example 3

[0092] The difference between Comparative Example 3 and Example 1 is that the conductive raw material is directly added to replace the active group modified material.

[0093] Performance tests are carried out separately for Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3.

[0094] Among them, it specifically includes the following tests, test methods, and results.

[0095] 1. Using a Shore hardness tester, referring to ASTM D2240-2015 "Standard Test Method for Rubber Hardness by Durometer", the hardness of the test thermal conductive silicone sheet is detected and the results are recorded;

[0096] 2. Using a material testing machine, referring to ASTM-D412 "Tensile Test Methods for Vulcanized Rubber and Thermoplastic Elastomers", the tensile strength of the test thermal conductive silicone sheet is detected and the results are recorded;

[0097] 3. Using a material testing machine, referring to ASTM-D3330 "Peel Strength Test Method", the peel strength of the test thermal conductive silicone sheet is detected and the results are recorded;

[0098] 4. The shear strength test was carried out with reference to GB / T 7124-2008.

[0099] The test results are shown in the following table:

[0100] Table 1 Performance test results

[0101]

[0102] It can be seen from Table 1 that among the three cases of modification and non-addition of methyl vinyl MQ resin, and under the modification effect of the active groups of the conductive raw materials, the modified methyl vinyl MQ resin is combined with the active group modified material, and then combined with vinyl siloxane, hydrogen-containing silicone oil, and fumed silica, which will significantly improve the shear strength, and effectively improve the tensile strength and peel strength, and effectively improve the bonding strength of the conductive silicone synthetic leather.

[0103] In summary, the present application provides a manufacturing process for a conductive silicone synthetic leather. By combining the drying function of a heat transfer oil oven, the intermittent coating function of an intermittent coater, and any one of the processes of mounting process, gravure process, rotary screen process, and printing process, the operation difficulty of the manufacturing process is significantly reduced when combining the manufacturing process of the conductive silicone synthetic leather, and the purpose of effectively improving the operation efficiency and the forming effect of the conductive silicone synthetic leather is achieved; at the same time, by modifying the conductive raw material to obtain a conductive material with active groups, that is, an active group modified material, which is added to the conductive rubber compound to play the role of conductivity, the conductive material is adhesively cross-linked with vinyl siloxane, hydrogen-containing silicone oil, fumed silica, and modified methyl vinyl MQ resin into one body, and effectively avoids the problem that the overall mechanical structure of the conductive silicone synthetic leather is affected due to the difficulty of fusion between the conductive raw material and vinyl siloxane, hydrogen-containing silicone oil, fumed silica, and modified methyl vinyl MQ resin. While the above components have a tightly connected effect, a stable bonding structure is formed with the substrate material after mixing and coating, thereby significantly improving the bonding strength of the conductive silicone synthetic leather, and achieving the purpose of improving the high-temperature resistance and the curing efficiency, reducing the synthesis and preparation difficulty of the conductive silicone synthetic leather, and expanding the scope of use scenarios.

[0104] The "first", "second", "third", "fourth", etc. (if any) involved in this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, or devices.

[0105] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0106] Specific examples are used herein to elaborate on the principles and implementation manners of this application. The descriptions of the above embodiments are only used to help understand the method and its core idea of this application. At the same time, for those of ordinary skill in the art, based on the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A manufacturing process of a conductive silicone synthetic leather, characterized in that, It includes the following steps: Step 1, base coating: Coating the sizing material on the release paper at intervals to form a coated sizing layer; Step 2, base drying: Taking the fabric and laminating it on the coated sizing layer, then performing heat drying treatment, and peeling off the release paper after the drying treatment is completed to obtain the base material; Step 3, pattern coating: Coating the conductive sizing material on the coated sizing layer of the base material to form the required circuit pattern and obtain the circuit pattern blank; Step 4, pattern drying: Drying the circuit pattern blank to obtain the conductive silicone synthetic leather; The viscosity of the coating sizing material is 10 5 -8×10 5 CPS, and the viscosity of the conductive sizing material is 0.5×10 4 -10 4 CPS; wherein: The conductive sizing material is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica, conductive material and modified methyl vinyl MQ resin, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst, inhibitor, fumed silica and conductive material is 10-30:60-80:1-5:0.03-1:2-5:20-50; The weight ratio of the modified methyl vinyl MQ resin to the hydrogen-containing silicone oil is 0.3-1:60-80, and the vinyl content is 0.5-1.8%; the molecular formula of the modified methyl vinyl MQ resin is: (CH3) 2 (CH2=CH)SiO 1 / 2 a [(CH3) 2 XSiO 1 / 2 b [SiO 4 / 2 c； ​​​ Among them, (a + b) / c = 0.6-1; X is vinylbenzylaminoethylaminopropyltrimethoxysilane; and the preparation process of the modified methyl vinyl MQ resin includes first mixing methyl vinyl MQ resin, 38% concentrated hydrochloric acid and toluene, heating to 55°C and stirring, adding vinylbenzylaminoethylaminopropyltrimethoxysilane and deionized water after stirring evenly and reacting for 1-2 h, then adding alkali solution to adjust the pH to 6.5, filtering and extracting to obtain a mixed solution of modified methyl vinyl MQ resin and toluene; then dropping vinyl silicone oil with a mass ratio of 3:1-2 into the mixed solution and stirring for 1-2 h, then heating to 120-130°C to distill out toluene to obtain the modified methyl vinyl MQ resin; the coated sizing material is composed of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor, and the weight ratio of vinyl siloxane, hydrogen-containing silicone oil, platinum catalyst and inhibitor is 100:10-20:1-5:0.03-1; the conductive material is an active group modified material, and the preparation method of the active group modified material is to dissolve the silane with active groups in ethanol to form a modified solution, and place the conductive raw material in a stirring kettle at a temperature of 80-120°C and stir, then spray the modified solution into the stirring kettle, control the mass ratio of the modified solution to the conductive raw material in the stirring kettle to be 0.2-2:25, and then heat to 120-140°C and dry to obtain the active group modified material.

2. The manufacturing process of a conductive silicone synthetic leather according to claim 1, characterized in that: In step 1, the release paper is a high-temperature resistant textured release paper; and a gap coater is used to coat the sizing material on the textured release paper at intervals, and the thickness of the coated sizing material is 0.01-0.05 mm, and the coating speed is 6 m / min.

3. The manufacturing process of a conductive silicone synthetic leather according to claim 1, characterized in that: In steps 2 and 4, drying is carried out using a heat transfer oil oven, and the heat transfer oil oven is heated to 140-160°C by a circulating fan, and the drying time is 1.5 min.

4. The manufacturing process of a conductive silicone synthetic leather according to claim 1, characterized in that: In step 3, a conductive adhesive is coated on the coated adhesive layer of the base material by using a mounting process, a gravure process, a rotary screen process or a printing process to form a desired circuit pattern.

5. The manufacturing process of a conductive silicone synthetic leather according to claim 1, characterized in that: The hydrogen-containing silicone oil is end-methyl side hydrogen-containing silicone oil, and the hydrogen content is 0.12-0.25%; the platinum catalyst is a chloroplatinic acid-isopropanol complex or a highly active catalyst of the Karstedt type; the inhibitor is ethynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol or methylbutynol.

6. The manufacturing process of a conductive silicone synthetic leather according to claim 1, characterized in that: The silane with an active group is one of tetra(dimethylsiloxy)silane, 3-glycidoxypropyltrimethoxysilane, allyldimethylchlorosilane and phenyltriethoxysilane; the conductive raw material is graphite, graphene or metal conductive powder, and the particle size of the conductive raw material is 800-2000 mesh.

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