Earphone sleeve and base material attached composite fabric and processing technology thereof
By combining modified imide alcohols, fluorosilicone modified chain extenders, and modified cellulose nanocrystals, the problem of adhesive residue between the earphone cover and the substrate was solved, achieving stable bonding between the earphone cover and the substrate and reducing deformation, thus improving product quality during the processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KUNSHAN YONGBAOSHUN COMPOSITE FABRIC CO LTD
- Filing Date
- 2024-07-11
- Publication Date
- 2026-08-04
AI Technical Summary
The existing adhesive between the earphone cover and the substrate is prone to residue when separated, affecting subsequent use.
An adhesive consisting of modified imide alcohol, fluorosilicone modified chain extender and modified cellulose nanocrystals is used. By coating the adhesive onto the substrate fabric and bonding it with the earphone cover fabric, a composite fabric of earphone cover and substrate is formed, which improves the bonding performance and stability and reduces adhesive residue.
This effectively reduces the deformation of the headphone cover fabric during transportation, ensures that the adhesive does not easily leave residue when separating, improves the fixation between the headphone cover and the substrate, and guarantees the quality of subsequent processing and use.
Abstract
Description
Technical Field
[0001] This application relates to the field of composite fabric preparation, and in particular to a composite fabric for bonding an earphone cover to a substrate and its processing technology. Background Technology
[0002] Earphone covers are accessories used for headphones, designed to be comfortable, fit snugly in the ear, and provide near-sealed music output. The fabric used for earphone covers has a certain degree of elasticity, making it susceptible to deformation during rolling, storage, and transportation, which can affect product quality.
[0003] Therefore, during processing, the earphone cover fabric needs to be bonded to a non-deformable base material to reduce deformation during transportation. However, existing adhesives have residue problems; when the earphone cover separates from the base material, adhesive residue can easily remain on the earphone cover, affecting subsequent use. This needs to be improved. Summary of the Invention
[0004] To reduce adhesive residue when the earphone cover separates from the substrate, this application provides a composite fabric for bonding the earphone cover and the substrate, and its processing technology.
[0005] The technical solution for the bonding of an earphone cover and a substrate composite fabric and its processing technology provided in this application is as follows: Firstly, the technical solution for the bonding of an earphone cover and a substrate composite fabric provided in this application is as follows: A composite fabric for bonding an earphone cover to a substrate, comprising an earphone cover fabric, an adhesive layer, and a substrate fabric, wherein the adhesive layer is obtained by coating the substrate fabric with an adhesive, and the adhesive comprises the following components in parts by weight: 10-20 parts of modified imide alcohol 20-30 parts of polyether diol 15-25 parts of isocyanate 3-5 parts of fluorosilicone modified chain extender 5-10 parts of modified cellulose nanocrystals 30-40 parts of solvent Catalyst 0.1-0.2 parts Additives: 0.5-1 part.
[0006] Modified imide alcohols can introduce imide structures into adhesives, and the imide groups can improve the thermal stability of the adhesive, thereby improving the adhesive performance and reducing adhesive residue. Fluorosilicone modified chain extenders can introduce fluorine and silicon elements into the adhesive, reducing the surface energy of the adhesive and reducing adhesive residue. Modified cellulose nanocrystals can reinforce the defects between adhesive molecules, improve its stability, and thus reduce adhesive residue when removed. The composite fabric of the earphone cover and the substrate has a good fixing effect, which can reduce the deformation of the earphone cover fabric by external forces. The adhesive has good bonding performance and stability, and the adhesive is not easy to leave residue when separated, reducing the impact on subsequent processing and use.
[0007] Preferably, the raw materials for preparing the modified imide alcohol include maleic anhydride, monoethanolamine, and furfuryl alcohol.
[0008] Preferably, the raw materials for preparing the maleic anhydride include rosin and maleic anhydride.
[0009] Maleic anhydride obtained by modifying maleic anhydride with rosin has abundant active groups, which can improve the bonding performance and stability of the adhesive. Further reaction of maleic anhydride with monoethanolamine and furfuryl alcohol can yield an alcohol with an imide group. The alcohol hydroxyl group can react with isocyanate to introduce the imide group into the adhesive molecule, thereby improving its stability and reducing the occurrence of residue.
[0010] Preferably, the raw materials for preparing the fluorosilicone modified chain extender include nanofillers, perfluorosilanes, and long-chain diamines.
[0011] The nanofiller is initially modified with perfluorosilane, which reacts with the hydroxyl groups on the nanofiller to increase the active groups on the surface of the nanofiller. Subsequently, it is further modified with long-chain diamine, which reacts with perfluorosilane to aminate the nanofiller, giving it long amino chains. These long-chain diamines can act as chain extenders to modify the adhesive and improve the stability of the adhesive molecules. The fluorosilicone modified chain extender has good hydrophobic and reactive properties, and can create a rough microphase structure on the surface of the adhesive layer, reducing the surface energy. This results in strong adhesion in some areas of the adhesive layer and weaker adhesion in others, thereby reducing adhesive residue during separation while ensuring adhesion performance.
[0012] Preferably, the mass ratio of the nanofiller, perfluorosilane and long-chain diamine is (2-3):1:1.5.
[0013] The fluorosilicone modified chain extender prepared according to the above mass ratio has good reactivity, which can improve the stability and bonding performance of the adhesive and reduce the residue of the adhesive.
[0014] Preferably, the raw materials for preparing the modified cellulose nanocrystals include esterified cellulose nanocrystals and phenolamine.
[0015] Preferably, the raw materials for preparing the esterified cellulose nanocrystals include the cellulose nanocrystal matrix and long-chain alkyl acids.
[0016] Preferably, the raw materials for preparing the phenolamine include catechol and triethylenediamine.
[0017] Esterified cellulose nanocrystals, modified with long-chain alkyl acids, exhibit excellent hydrophobic properties. Phenolic amines, generated from the reaction of catechol and triethylenediamine, possess high reactivity and can further modify esterified cellulose nanocrystals, reinforcing them, improving their thermal stability, and simultaneously imbuing them with a mussel-like biomimetic effect, thus enhancing their adhesive properties. Incorporating modified cellulose nanocrystals into adhesive molecules can compensate for molecular structural defects and improve thermal stability. Combining the hydrophobic properties of modified cellulose nanocrystals with the mussel-like biomimetic effect can improve adhesive properties while reducing residue during separation. Synergistically, with fluorosilicone-modified chain extenders, this enhances the adhesive's adhesion and stability.
[0018] Preferably, the mass ratio of the esterified cellulose nanocrystals, catechol and triethylenediamine is (6-10):1:1.2.
[0019] The modified cellulose nanocrystals prepared according to the above mass ratio have good hydrophobic properties, adhesion properties and thermal stability.
[0020] Secondly, this application provides a processing technology for composite fabrics used in bonding earphone covers and substrates, employing the following technical solution: A processing method for bonding a composite fabric between an earphone cover and a substrate comprises the following steps: Modified imide alcohol and polyether polyol are heated and dehydrated under reduced pressure. After cooling, anhydrous modified imide alcohol and anhydrous polyether polyol are obtained. Anhydrous modified imide alcohol, anhydrous polyether polyol, solvent, fluorosilicone modified chain extender and additives are heated, mixed and stirred to obtain monomer mixture. Isocyanate is added to monomer mixture and heated to react to obtain prepolymer. Catalyst and modified cellulose nanocrystals are added to prepolymer to react. After degassing under reduced pressure, adhesive is obtained. Adhesive is coated on the surface of substrate fabric to obtain adhesive layer. After the earphone cover fabric is bonded to adhesive layer, it is pressed to obtain earphone cover and substrate bonded composite fabric.
[0021] The earphone cover and the substrate composite fabric prepared according to the above steps have a good fixing effect, which can reduce the deformation of the earphone cover fabric by external force. When separated, the adhesive is not easy to leave residue, which reduces the impact on subsequent processing and use.
[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Modified imide alcohols can introduce imide structures into adhesives. The imide groups can improve the thermal stability of the adhesive, thereby improving its bonding performance and reducing adhesive residue. Fluorosilicone modified chain extenders can introduce fluorine and silicon elements into the adhesive, reducing the surface energy of the adhesive and reducing adhesive residue. Modified cellulose nanocrystals can reinforce defects between adhesive molecules, improving its stability and reducing residue when the adhesive is removed. The composite fabric bonded to the earphone cover and the substrate has a good fixing effect, which can reduce the deformation of the earphone cover fabric by external forces. The adhesive has good bonding performance and stability, and the adhesive is not easy to leave residue when separated, reducing the impact on subsequent processing and use.
[0023] 2. The nanofiller is initially modified with perfluorosilane. The perfluorosilane reacts with the hydroxyl groups on the nanofiller to increase the active groups on the surface of the nanofiller. Subsequently, it is further modified with long-chain diamine. The long-chain diamine reacts with the perfluorosilane to aminate the nanofiller, giving it long amino chains. These amino chains can act as chain extenders to modify the adhesive and improve the stability of the adhesive molecules. The fluorosilicone modified chain extender has good hydrophobic and reactive properties. It can create a rough microphase structure on the surface of the adhesive layer, reduce the surface energy, and make the adhesion strong in some areas and weak in others on the surface of the adhesive layer. This reduces the residue of the adhesive during separation while ensuring the adhesion performance.
[0024] 3. Esterified cellulose nanocrystals, modified with long-chain alkyl acids, exhibit excellent hydrophobic properties. The phenolic amine generated from the reaction of catechol and triethylenediamine possesses high reactivity and can further modify the esterified cellulose nanocrystals, reinforcing them, improving their thermal stability, and simultaneously giving them a mussel-like biomimetic effect, thus enhancing their adhesion performance. Incorporating modified cellulose nanocrystals into adhesive molecules can compensate for defects in the molecular structure and improve their thermal stability. Combining the hydrophobic effect of modified cellulose nanocrystals with the mussel-like biomimetic effect can improve adhesion performance while reducing residue during separation. Synergistically, with the help of fluorosilicone-modified chain extenders, the adhesion performance and stability of the adhesive are further enhanced. Detailed Implementation
[0025] This application discloses a composite fabric for bonding an earphone cover to a substrate and its processing technology in the embodiments and preparation examples. Unless otherwise specified, all raw materials used in this application are commercially available. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material description: Rosin (CAS No.: 8050-09-7), maleic anhydride (CAS No.: 108-31-6), dibutyltin dilaurate (CAS No.: 77-58-7), turpentine oil (CAS No.: 8006-64-2), furan (CAS No.: 110-00-9), monoethanolamine (CAS No.: 141-43-5), triethylamine (CAS No.: 121-44-8), xylene (CAS No.: 1330- 20-7), hydroquinone (CAS No.: 123-31-9), furfuryl alcohol (CAS No.: 98-00-0), nanofiller is nano-titanium dioxide, purchased from Ningbo Jiwei Nano New Materials Technology Co., Ltd., perfluorosilane is (3,3,3-trifluoropropyl)dichloromethylsilane (CAS No.: 675-62-7), toluene (CAS No.: 108-88-3), long-chain diamine is 1,7-heptanediamine (CAS No.: 646-19-5), Cellulose nanocrystals were purchased from Xi'an Qiyue Biotechnology Co., Ltd. The following components were also present: stearic acid (CAS No.: 57-11-4), catechol (CAS No.: 120-80-9), triethylenediamine (CAS No.: 280-57-9), polyether polyol (CAS No.: 9003-11-6), dimethyl carbonate (CAS No.: 616-38-6) as solvent, antioxidant 1010 (CAS No.: 6683-19-8) as an adjuvant, and isocyanate... Isophorone diisocyanate (CAS No.: 4098-71-9), with the catalysts being dibutyltin dilaurate (CAS No.: 77-58-7), methyltriethoxysilane (CAS No.: 2031-67-6), ethylenediamine (CAS No.: 107-15-3), polyester diol (CAS No.: 68082-28-0), and 3,3'-dichloro-4,4'-diaminodiphenylmethane (CAS No.: 101-14-4).
[0026] Preparation Example 1: Preparation of Modified Imide Alcohols 60.4 kg of rosin, 11.53 kg of maleic anhydride, and 1.2 kg of dibutyltin dilaurate were mixed and dispersed. Ammonia gas was introduced for 15 min, and the mixture was heated until it melted. Then, the mixture was stirred at 200 rpm and heated to 180 °C. After reacting at 180 °C for 4 h, the mixture was cooled to 110 °C and the product was poured into turpentine oil. The mixture was crystallized at room temperature. The crystals were washed three times with ethanol by vacuum filtration. The washed crystals were then dried in a vacuum oven at 60 °C to obtain maleic anhydride.
[0027] 30 kg of maleic anhydride was dissolved in 100 L of acetone to obtain a maleic anhydride solution. 34.6 kg of furan was added to the maleic anhydride solution and the addition was completed within 2 hours. The reaction was carried out under nitrogen protection by stirring at 200 rpm for 12 hours to obtain a product mixture. The product mixture was vacuum filtered to obtain a product precipitate. The product precipitate was washed with diethyl ether and then vacuum dried in an oven at 60 °C to obtain an intermediate product. 30 kg of intermediate product was dissolved in 100 L of acetone to obtain an intermediate product solution. 22 kg of monoethanolamine and 36 kg of triethylamine were dissolved in 100 L of acetone to obtain an alcohol-amine solution. The alcohol-amine solution was added to the intermediate product solution under nitrogen protection and an ice bath, and the addition was completed within 2 hours to obtain a mixed reaction solution. The mixed reaction solution was gradually heated to 90 °C and refluxed for 4 hours. After the reaction was completed, it was cooled to 30 °C to begin crystallization. After crystallization was completed, the product was obtained by vacuum filtration. The crystallized product was washed with isopropanol and then dried in a vacuum oven at 60 °C to obtain the second intermediate product. 40 kg of the second intermediate product, 220 kg of xylene, and 5 g of hydroquinone were mixed and refluxed at 130 °C for 3 hours under nitrogen protection. After removing the reflux, the reaction was continued for 1 hour. The product was cooled to 30 °C to begin crystallization. The crude product was obtained by vacuum filtration, washed with xylene, and dried in a vacuum oven at 60 °C to obtain maleic anhydride imide.
[0028] 30 kg of maleic pine imide and 6.6 kg of furfuryl alcohol were mixed and dispersed in 100 L of toluene and refluxed at 80 °C for 12 h to obtain a mixture solution. The mixture solution was vacuum filtered, washed with diethyl ether, and dried in a vacuum oven at 60 °C to obtain the modified imide alcohol.
[0029] Example 1 Preparation of fluorosilicone modified chain extenders 4.45 kg of nano-titanium dioxide and 2.22 kg of (3,3,3-trifluoropropyl)dichloromethylsilane were mixed and dispersed in 200 L of toluene and stirred at 200 rpm for 2 h. Then, 1.2 L of deionized water was added, and the mixture was stirred at 200 rpm in an 80 °C water bath for 4 h. Then, 3.33 kg of 1,7-heptanediamine was added, and the mixture was stirred at 200 rpm in an 80 °C water bath for another 4 h. The resulting product solution was filtered to obtain the filtrate. The filtrate was washed with anhydrous ethanol and dried in an 80 °C oven for 6 h to obtain the fluorosilicone modified chain extender.
[0030] Preparation of modified cellulose nanocrystals 20 kg of cellulose nanocrystals were dispersed in 50 L of deionized water to obtain a nanocrystal suspension. Then, 25 L of anhydrous ethanol was added and ultrasonically dispersed for 30 min. Next, 40 kg of stearic acid was added and ultrasonically dispersed for another 30 min to obtain a suspension reaction solution. The suspension reaction solution was stirred at 80 °C and 200 rpm for 8 h, then cooled to 30 °C and reacted for 4 h. The reaction was terminated by adding anhydrous ethanol. The solid product was obtained by centrifugation and washed three times with anhydrous ethanol. The washed solid product was dried in a 60 °C forced-air drying oven to obtain esterified cellulose nanocrystals.
[0031] 2.44 kg of catechol was dispersed in 30 L of deionized water and stirred at 200 rpm until completely dissolved to obtain a catechol solution. 2.93 kg of triethylenediamine was added to the catechol solution and stirred at 200 rpm for 10 min. The pH was adjusted to 10.5 using a 1 mol / L sodium hydroxide aqueous solution to obtain a phenolamine solution. 14.63 kg of esterified cellulose nanocrystals were added to the phenolamine solution and stirred at 200 rpm for 2 h. After filtration, the nanocrystals were dried in a 60℃ forced-air drying oven to obtain modified cellulose nanocrystals.
[0032] Preparation of composite fabric for bonding earphone covers and substrate The modified imide alcohol and polyether polyol prepared in Preparation Example 1 were heated to 100°C for dehydration under reduced pressure, and then cooled to 60°C to obtain anhydrous modified imide alcohol and anhydrous polyether polyol. 10 kg of anhydrous modified imide alcohol, 20 kg of anhydrous polyether polyol, 30 kg of solvent, 3 kg of fluorosilicone modified chain extender, and 0.5 kg of additives were mixed and stirred at 200 rpm at 60°C to obtain a monomer mixture. 15 kg of isocyanate was added to the monomer mixture, and the mixture was heated to 80°C and reacted for 6 hours to obtain a prepolymer. 0.1 kg of catalyst and 5 kg of modified cellulose nanocrystals were added to the prepolymer, and the reaction was continued for 2 hours. After degassing under reduced pressure for 4 hours, an adhesive was obtained. The adhesive was coated onto the surface of the substrate fabric to obtain an adhesive layer. The earphone cover fabric was then bonded to the adhesive layer and pressed to obtain a composite fabric of earphone cover and substrate.
[0033] Example 2 Preparation of fluorosilicone modified chain extenders 5.45 kg of nano-titanium dioxide and 1.82 kg of (3,3,3-trifluoropropyl)dichloromethylsilane were mixed and dispersed in 200 L of toluene and stirred at 200 rpm for 2 h. Then, 1.2 L of deionized water was added, and the mixture was stirred at 200 rpm for 4 h in an 80 °C water bath. Then, 2.73 kg of 1,7-heptanediamine was added, and the mixture was stirred at 200 rpm for another 4 h in an 80 °C water bath. The resulting product solution was filtered to obtain the filtrate. The filtrate was washed with anhydrous ethanol and dried in an 80 °C oven for 6 h to obtain the fluorosilicone modified chain extender.
[0034] Preparation of modified cellulose nanocrystals 20 kg of cellulose nanocrystals were dispersed in 50 L of deionized water to obtain a nanocrystal suspension. Then, 25 L of anhydrous ethanol was added and ultrasonically dispersed for 30 min. Next, 40 kg of stearic acid was added and ultrasonically dispersed for another 30 min to obtain a suspension reaction solution. The suspension reaction solution was stirred at 80 °C and 200 rpm for 8 h, then cooled to 30 °C and reacted for 4 h. The reaction was terminated by adding anhydrous ethanol. The solid product was obtained by centrifugation and washed three times with anhydrous ethanol. The washed solid product was dried in a 60 °C forced-air drying oven to obtain esterified cellulose nanocrystals.
[0035] 1.64 kg of catechol was dispersed in 30 L of deionized water and stirred at 200 rpm until completely dissolved to obtain a catechol solution. 1.97 kg of triethylenediamine was added to the catechol solution and stirred at 200 rpm for 10 min. The pH was adjusted to 10.5 using a 1 mol / L sodium hydroxide aqueous solution to obtain a phenolamine solution. 16.39 kg of esterified cellulose nanocrystals were added to the phenolamine solution and stirred at 200 rpm for 2 h. After filtration, the nanocrystals were dried in a 60℃ forced-air drying oven to obtain modified cellulose nanocrystals.
[0036] Preparation of composite fabric for bonding earphone covers and substrate The modified imide alcohol and polyether polyol prepared in Preparation Example 1 were heated to 100°C for dehydration under reduced pressure, and then cooled to 60°C to obtain anhydrous modified imide alcohol and anhydrous polyether polyol. 20 kg of anhydrous modified imide alcohol, 30 kg of anhydrous polyether polyol, 40 kg of solvent, 5 kg of fluorosilicone modified chain extender, and 1 kg of additives were mixed and stirred at 200 rpm at 60°C to obtain a monomer mixture. 25 kg of isocyanate was added to the monomer mixture, and the mixture was heated to 80°C and reacted for 6 hours to obtain a prepolymer. 0.2 kg of catalyst and 10 kg of modified cellulose nanocrystals were added to the prepolymer, and the reaction was continued for 2 hours. After degassing under reduced pressure for 4 hours, an adhesive was obtained. The adhesive was coated onto the surface of the substrate fabric to obtain an adhesive layer. The earphone cover fabric was then bonded to the adhesive layer and pressed to obtain a composite fabric of earphone cover and substrate.
[0037] Example 3 Preparation of fluorosilicone modified chain extenders 5 kg of nano-titanium dioxide and 2 kg of (3,3,3-trifluoropropyl)dichloromethylsilane were mixed and dispersed in 200 L of toluene and stirred at 200 rpm for 2 h. Then, 1.2 L of deionized water was added, and the mixture was stirred at 200 rpm for 4 h in an 80 °C water bath. Then, 3 kg of 1,7-heptanediamine was added, and the mixture was stirred at 200 rpm for another 4 h in an 80 °C water bath. The resulting product solution was filtered to obtain the filtrate. The filtrate was washed with anhydrous ethanol and dried in an 80 °C oven for 6 h to obtain the fluorosilicone modified chain extender.
[0038] Preparation of modified cellulose nanocrystals 20 kg of cellulose nanocrystals were dispersed in 50 L of deionized water to obtain a nanocrystal suspension. Then, 25 L of anhydrous ethanol was added and ultrasonically dispersed for 30 min. Next, 40 kg of stearic acid was added and ultrasonically dispersed for another 30 min to obtain a suspension reaction solution. The suspension reaction solution was stirred at 80 °C and 200 rpm for 8 h, then cooled to 30 °C and reacted for 4 h. The reaction was terminated by adding anhydrous ethanol. The solid product was obtained by centrifugation and washed three times with anhydrous ethanol. The washed solid product was dried in a 60 °C forced-air drying oven to obtain esterified cellulose nanocrystals.
[0039] 1.96 kg of catechol was dispersed in 30 L of deionized water and stirred at 200 rpm until completely dissolved to obtain a catechol solution. 2.35 kg of triethylenediamine was added to the catechol solution and stirred at 200 rpm for 10 min. The pH was adjusted to 10.5 using a 1 mol / L sodium hydroxide aqueous solution to obtain a phenolamine solution. 15.69 kg of esterified cellulose nanocrystals were added to the phenolamine solution and stirred at 200 rpm for 2 h. After filtration, the nanocrystals were dried in a 60℃ forced-air drying oven to obtain modified cellulose nanocrystals.
[0040] Preparation of composite fabric for bonding earphone covers and substrate The modified imide alcohol and polyether polyol prepared in Preparation Example 1 were heated to 100°C for dehydration under reduced pressure, and then cooled to 60°C to obtain anhydrous modified imide alcohol and anhydrous polyether polyol. 15 kg of anhydrous modified imide alcohol, 25 kg of anhydrous polyether polyol, 35 kg of solvent, 4 kg of fluorosilicone modified chain extender, and 0.75 kg of additives were mixed and stirred at 200 rpm at 60°C to obtain a monomer mixture. 20 kg of isocyanate was added to the monomer mixture, and the mixture was heated to 80°C and reacted for 6 hours to obtain a prepolymer. 0.15 kg of catalyst and 7.5 kg of modified cellulose nanocrystals were added to the prepolymer, and the reaction was continued for 2 hours. After degassing under reduced pressure for 4 hours, an adhesive was obtained. The adhesive was coated onto the surface of the substrate fabric to obtain an adhesive layer. The earphone cover fabric was then bonded to the adhesive layer and pressed to obtain a composite fabric of earphone cover and substrate.
[0041] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that in Example 4, the amount of nanofiller is 3.75 kg, the amount of perfluorosilane is 2.5 kg, and the amount of long-chain diamine is 3.75 kg.
[0042] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the amount of nanofiller is 5.83 kg, the amount of perfluorosilane is 1.67 kg, and the amount of long-chain diamine is 2.5 kg.
[0043] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that in Example 6, perfluorosilane is replaced with methyltriethoxysilane when preparing the fluorosilicone modified chain extender.
[0044] Example 7 Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that in Example 7, the long-chain diamine is replaced with ethylenediamine when preparing the fluorosilicone modified chain extender.
[0045] Example 8 Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that maleic anhydride was replaced with maleic anhydride when preparing the modified imide alcohol in Example 8.
[0046] Example 9 Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, the amount of esterified cellulose nanocrystals used is 12.9 kg, the amount of catechol is 3.23 kg, and the amount of triethylenediamine is 3.87 kg.
[0047] Example 10 Example 10 is based on Example 3. The only difference between Example 10 and Example 3 is that in Example 10, the amount of esterified cellulose nanocrystals used is 16.9 kg, the amount of catechol is 1.41 kg, and the amount of triethylenediamine is 1.69 kg.
[0048] Example 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that in Example 11, the esterified cellulose nanocrystals used in the preparation of modified cellulose nanocrystals are replaced with cellulose nanocrystals.
[0049] Example 12 Example 12 is based on Example 3. The only difference between Example 12 and Example 3 is that in Example 12, the phenolamine used in the preparation of modified cellulose nanocrystals is replaced with catechol.
[0050] Example 13 Example 13 is based on Example 3. The only difference between Example 13 and Example 3 is that in Example 13, the phenolamine used in the preparation of modified cellulose nanocrystals is replaced with triethylenediamine.
[0051] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that the modified imide alcohol is replaced with a polyester diol in Comparative Example 1.
[0052] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that the fluorosilicone modified chain extender in Comparative Example 2 is replaced with 3,3'-dichloro-4,4'-diaminodiphenylmethane.
[0053] Comparative Example 3 Comparative Example 3 is based on Example 3. The only difference between Comparative Example 3 and Example 3 is that the modified cellulose nanocrystals are replaced with cellulose nanocrystals in Comparative Example 3.
[0054] Performance testing (1) The standard GB / T2792-2014 Test Method for Peel Strength of Adhesive Tape was selected. The 180° peel force of the adhesive was tested using a benchtop tensile testing machine. Three samples were prepared for each specimen. The average value was taken after measurement and the results were recorded in Table 1.
[0055] (2) Residue test: 10 samples of 20cm*20cm were cut from the composite fabric, the earphone cover fabric was separated from the base material fabric, and the residue of the adhesive was observed. The results are recorded in Table 1.
[0056] Table 1. Test results of peel strength and adhesive residue of composite fabrics Example 1 20.3 No residue Example 2 20.6 No residue Example 3 21.1 No residue Example 4 18.7 No residue Example 5 19.3 No residue Example 6 20.2 A small amount of residue Example 7 18.2 No residue Example 8 17.6 A small amount of residue Example 9 20.5 A small amount of ginseng residue Example 10 15.4 No residue Example 11 23.6 Some residue Example 12 17.2 No residue Example 13 18.3 No residue Comparative Example 1 23.2 Serious residue Comparative Example 2 19.9 Serious residue Comparative Example 3 17.8 Some residue As shown in Table 1, the peel force of Examples 1-3 is greater than 20.3 N / 25 mm, and there is no adhesive residue after separation. This shows that the adhesive prepared in this application has good bonding performance and stability, can effectively bond composite fabrics, reduce fabric deformation, and achieve no adhesive residue, which is beneficial for subsequent processing and use.
[0057] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that the mass ratio of nanofiller, perfluorosilane, and long-chain diamine in Example 4 is 1.5:1:1.5, while the mass ratio of nanofiller, perfluorosilane, and long-chain diamine in Example 5 is 3.5:1:1.5. Compared with Example 3, the adhesion performance of Examples 4 and 5 is reduced. This is because the mass ratio of nanofiller, perfluorosilane, and long-chain diamine is not within the specified range, which reduces the stability and reactivity of the fluorosilicone modified chain extender, thereby affecting the adhesion performance and stability of the adhesive.
[0058] As shown in Table 1, the only difference between Examples 6 and 7 and Example 3 is that in Example 6, perfluorosilane was replaced with methyltriethoxysilane when preparing the fluorosilicone modified chain extender, and in Example 7, long-chain diamine was replaced with ethylenediamine. Compared with Example 3, the adhesion performance and stability of Examples 6 and 7 decreased. This is because replacing perfluorosilane with methyltriethoxysilane results in the lack of fluorine atom introduction, which increases the surface energy of the fluorosilicone modified chain extender, making it easier for adhesive residues to remain during separation. Replacing long-chain diamine with ethylenediamine reduces the reactivity of the fluorosilicone modified chain extender due to steric hindrance between molecules, thus reducing its stability and adhesion performance.
[0059] As shown in Table 1, the only difference between Example 8 and Example 3 is that in Example 8, maleic anhydride was replaced with maleic anhydride when preparing the modified imide alcohol. Compared with Example 3, Example 8 lacks rosin modification treatment, and the thermal stability and adhesion properties of the modified imide alcohol decrease, thereby reducing the stability and adhesion properties of the adhesive.
[0060] As shown in Table 1, the only difference between Examples 9 and 10 and Example 3 is that the mass ratio of esterified cellulose nanocrystals, catechol, and triethylenediamine in Example 9 is 4:1:1.2, while the mass ratio of esterified cellulose nanocrystals, catechol, and triethylenediamine in Example 10 is 12:1:1.2. Compared with Example 3, the adhesion performance and stability of Examples 9 and 10 have decreased. This is because the mass ratio of esterified cellulose nanocrystals, catechol, and triethylenediamine is not within the specified range. Too much or too little phenolamine grafting will affect the balance between hydrophobic and adhesive effects in the modified cellulose nanocrystals, thereby affecting their adhesion performance and stability.
[0061] As shown in Table 1, the differences between Examples 11, 12, and 13 and Example 3 are only as follows: In Example 11, the esterified cellulose nanocrystals used in preparing modified cellulose nanocrystals were replaced with cellulose nanocrystals; in Example 12, the phenolamine used in preparing modified cellulose nanocrystals was replaced with catechol; and in Example 13, the phenolamine used in preparing modified cellulose nanocrystals was replaced with triethylenediamine. Compared with Example 3, the adhesion performance and stability of Examples 11, 12, and 13 decreased. This is because replacing the esterified cellulose nanocrystals with cellulose nanocrystals resulted in a lack of modification treatment with long-chain alkyl acids, leading to a decrease in hydrophobic properties. Without the addition of catechol or triethylenediamine, the biomimetic effect of mussels was weakened, resulting in a decrease in adhesion performance. These changes all affect the balance between hydrophobicity and adhesion performance in modified cellulose nanocrystals, thereby affecting the adhesion performance and stability of the adhesive and causing residues.
[0062] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that the modified imide alcohol in Comparative Example 1 was replaced with polyester diol. Compared with Example 3, the stability of Comparative Example 1 was significantly reduced and the residue was serious. This is because the modified imide alcohol was replaced with polyester diol. Polyester diol has good adhesion properties, but its heat resistance is worse than that of modified imide alcohol, resulting in a decrease in stability and making it easier to generate residue during separation.
[0063] As shown in Table 1, the only difference between Comparative Example 2 and Example 3 is that the fluorosilicone modified chain extender in Comparative Example 2 is replaced with 3,3'-dichloro-4,4'-diaminodiphenylmethane. Compared with Example 3, the fluorosilicone modified chain extender in Comparative Example 2 is replaced with a conventional chain extender. Although the presence of phenyl groups can improve the hydrophobic properties to a certain extent, the lack of fluorine atoms and the introduction of filler particles have limited effect on reducing surface energy, thus affecting its stability and residue, and making it easier to generate residue on the surface.
[0064] As shown in Table 1, the only difference between Comparative Example 3 and Example 3 is that Comparative Example 3 replaced modified cellulose nanocrystals with cellulose nanocrystals. Compared with Example 3, Comparative Example 3 showed a significant decrease in both adhesion performance and stability. This is because when modified cellulose nanocrystals are replaced with cellulose nanocrystals, the cellulose nanocrystals lack long-chain alkyl acid modification and phenolamine modification, resulting in a decrease in both hydrophobic and adhesion performance, a decrease in the adhesion performance of the adhesive, and an increase in the amount of residual adhesive.
[0065] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.
Claims
1. A composite fabric for bonding an earphone cover to a substrate, characterized in that: The composite fabric for bonding the earphone cover to the substrate includes an earphone cover fabric, an adhesive layer, and a substrate fabric. The adhesive layer is obtained by coating the substrate fabric with an adhesive, and the adhesive comprises the following components in parts by weight: 10-20 parts of modified imide alcohol 20-30 parts of polyether diol 15-25 parts of isocyanate 3-5 parts of fluorosilicone modified chain extender 5-10 parts of modified cellulose nanocrystals 30-40 parts of solvent Catalyst 0.1-0.2 parts 0.5-1 part of auxiliary agent; The raw materials for preparing the modified imide alcohol include maleic anhydride, monoethanolamine, and furfuryl alcohol. The raw materials for preparing the fluorosilicone modified chain extender include nanofillers, perfluorosilanes, and long-chain diamines. The mass ratio of the nanofiller, perfluorosilane, and long-chain diamine is (2-3):1:1.5; The raw materials for preparing the modified cellulose nanocrystals include esterified cellulose nanocrystals and phenolamines; The raw materials for preparing the phenolamine include catechol and triethylenediamine; The mass ratio of the esterified cellulose nanocrystals, catechol, and triethylenediamine is (6-10):1:1.
2.
2. The composite fabric for bonding an earphone cover to a substrate according to claim 1, characterized in that: The raw materials for preparing maleic anhydride include rosin and maleic anhydride.
3. The composite fabric for bonding an earphone cover to a substrate according to claim 1, characterized in that: The raw materials for preparing the esterified cellulose nanocrystals include the cellulose nanocrystal matrix and long-chain alkyl acids.
4. A processing technology for bonding the earphone cover and the substrate to the composite fabric as described in claim 1, characterized in that: The following steps are used: Modified imide alcohol and polyether diol are heated and dehydrated under reduced pressure. After cooling, anhydrous modified imide alcohol and anhydrous polyether diol are obtained. Anhydrous modified imide alcohol, anhydrous polyether diol, solvent, fluorosilicone modified chain extender and additives are heated, mixed and stirred to obtain monomer mixture. Isocyanate is added to monomer mixture and heated to react to obtain prepolymer. Catalyst and modified cellulose nanocrystals are added to prepolymer to react. After degassing under reduced pressure, adhesive is obtained. Adhesive is coated on the surface of substrate fabric to obtain adhesive layer. After the earphone cover fabric is bonded to adhesive layer, it is pressed to obtain earphone cover and substrate bonded composite fabric.