CN116023879A - Acoustic adhesive tape and preparation method thereof - Google Patents
Acoustic adhesive tape and preparation method thereof Download PDFInfo
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- CN116023879A CN116023879A CN202211723711.2A CN202211723711A CN116023879A CN 116023879 A CN116023879 A CN 116023879A CN 202211723711 A CN202211723711 A CN 202211723711A CN 116023879 A CN116023879 A CN 116023879A
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Abstract
The invention discloses an acoustic adhesive tape and a preparation method thereof, wherein the acoustic adhesive tape is obtained by uniformly mixing a toughening modified pressure-sensitive adhesive, a curing agent and a diluent, then coating the mixture on a release film, and drying and curing the mixture; the toughening modified pressure-sensitive adhesive comprises the following raw materials in parts by weight: 50 to 95 parts of toughening monomer, 5 to 25 parts of temperature resistant monomer, 0.5 to 5 parts of crosslinking monomer, 0.1 to 5 parts of toughening modifier, 0.15 to 0.8 part of initiator, 0.5 to 2 parts of anti-aging agent and 60 to 200 parts of solvent; the acrylic pressure-sensitive adhesive has the advantages of good flexibility, good temperature resistance, high elongation and good adhesion to different adherends, and solves the problem of poor distortion of the traditional acrylic pressure-sensitive adhesive in the vibration process.
Description
Technical Field
The invention belongs to the technical field of adhesive tapes, and particularly relates to an acoustic adhesive tape and a preparation method thereof.
Background
The principle of the loudspeaker is to convert an acoustic wave electric signal into an acoustic signal and transmit the acoustic signal out, and the loudspeaker is an energy conversion device. The diaphragm plays a critical role in the sound amplifying performance of the loudspeaker, and determines the quality of the conversion of the loudspeaker from electrical energy to acoustic energy and the use experience of the end user.
The vibrating diaphragm of the loudspeaker on the market at present is mainly formed by compounding materials such as polyethylene naphthalate PEN, polyether ether ketone PEEK, polyarylate PAR, polyetherimide PEI, polyphenylene sulfide PPS, polyurethane elastomer TPU, polyester elastomer TPEE and the like. The diaphragm is bonded and compounded by using an adhesive tape or an adhesive, and the acrylic pressure-sensitive adhesive has a wide application temperature range, strong mechanical property and low cost, so that the acrylic pressure-sensitive adhesive becomes an indispensable component in the diaphragm compounding process.
However, the existing acrylic pressure-sensitive adhesive has poor film forming performance and heat resistance and flexibility which cannot be combined, so that the vibration film composite material has high vibration resonance frequency FO and is easy to cause poor distortion.
Disclosure of Invention
In order to solve the technical problems, the invention provides an acoustic adhesive tape and a preparation method thereof, which have the advantages of good flexibility, good temperature resistance, high elongation and good adhesion to different objects to be adhered, and solve the problem of poor distortion of the traditional acrylic pressure-sensitive adhesive in the vibration process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the acoustic adhesive tape is obtained by uniformly mixing a toughening modified pressure-sensitive adhesive, a curing agent and a diluent, then coating the mixture on a release film, and drying and curing the mixture; the toughening modified pressure-sensitive adhesive comprises the following raw materials in parts by weight: 50 to 95 parts of toughening monomer, 5 to 25 parts of temperature resistant monomer, 0.5 to 5 parts of crosslinking monomer, 0.1 to 5 parts of toughening modifier, 0.15 to 0.8 part of initiator, 0.5 to 2 parts of anti-aging agent and 60 to 200 parts of solvent.
The toughening monomer is any one or more of 2 ethylhexyl acrylate, isooctyl acrylate, butyl acrylate, lauryl acrylate, ethyl acrylate, isobutyl acrylate and hydroxybutyl acrylate.
The temperature resistant monomer is any one or more of cyclohexyl methacrylate, hydroxyethyl methacrylate, styrene, acrylonitrile, methyl acrylate, methyl methacrylate, vinyl acetate and isobornyl acrylate.
The crosslinking monomer is any one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate and itaconic acid.
The toughening modifier is any one or more of heptadiene, isoprene, octadiene and methyl cardiac maleate.
The initiator is any one or more of azodiisobutyronitrile, azodiisovaleronitrile and benzoyl peroxide.
The anti-aging agent is one or more of amine anti-aging agent and phenol anti-aging agent.
The solvent is one or more of toluene, ethyl acetate, butyl acetate, methyl acetate and butanone.
The curing agent is any one or more of amino resin, epoxy resin, aziridine, metal salt and isocyanate.
The diluent is any one or more of ethyl acetate, butyl acetate, methyl acetate, butanone and toluene.
The weight ratio of the toughening modified pressure-sensitive adhesive to the curing agent to the diluent is 1: 0.005-0.015: 0.3 to 0.5.
The preparation method of the acoustic adhesive tape provided by the invention comprises the following steps:
(1) Uniformly mixing a toughening monomer, a temperature-resistant monomer, a crosslinking monomer and a toughening modifier to obtain a monomer mixed solution;
(2) Under the protection of inert gas, uniformly mixing 60% of monomer mixed solution and 40% of solvent in a reaction container, heating to 70-80 ℃, dropwise adding 60% of initiator at a uniform speed when reflux occurs, controlling the dropwise adding speed, ensuring that the dropwise adding of the initiator is completed for 1h, and preserving heat for 1h after the dropwise adding is completed;
(3) Dripping the rest 40% of monomer mixed solution, 30% of solvent and 20% of initiator into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed;
(4) Finally, dripping the rest 30 percent of solvent and 20 percent of initiator into a reaction container at a constant speed, ensuring that the dripping of the initiator is completed for 1 hour, preserving heat for 2 hours after the dripping is completed, cooling to room temperature, adding an antioxidant, and uniformly stirring to obtain the toughening modified pressure-sensitive adhesive;
(5) Adding a curing agent into the toughening modified pressure-sensitive adhesive, adding a diluent for dilution, coating on a release film, drying, attaching the release film, and curing to obtain the acoustic adhesive tape.
The acoustic adhesive tape provided by the invention adopts the toughening modifier to participate in free radical polymerization reaction, and is copolymerized with the toughening monomer, the temperature-resistant monomer and the crosslinking monomer to synthesize the pressure-sensitive adhesive with good comprehensive performance. The toughening modifier selected by the invention is any one or more of heptadiene, isoprene, octadiene and methyl cardiac acid, and belongs to nonpolar materials, so that the prepared acoustic adhesive tape has good wettability to different adherends. The toughening modifier selected by the invention is an important raw material of synthetic rubber, and participates in the copolymerization of acrylate monomers, so that the toughness of the acoustic adhesive tape is high enough, and the film forming performance of the pressure-sensitive adhesive is obviously improved; and the antioxidant introduced in the system synthesis improves the temperature resistance of the acoustic adhesive tape to a certain extent.
In the preparation method of the acoustic adhesive tape, the initiator is slowly dripped when the synthesis reaction occurs, so that the phenomenon that the pressure-sensitive adhesive has too low molecular weight due to the fact that a large number of free radicals are generated when the initiator is added at one time and the chain termination reaction occurs too early in the synthesis stage is avoided.
Compared with the prior art, the invention has the following beneficial effects: the acoustic adhesive tape provided by the invention is directly solidified into a film by using the toughening modified acrylic pressure-sensitive adhesive, and a substrate material is not required to be additionally used, so that the cost is low; the acoustic adhesive tape provided by the invention has the advantages of good flexibility, good temperature resistance, high elongation and good adhesion to different adherends, and solves the problem of poor distortion of the traditional acrylic pressure-sensitive adhesive in the vibration process.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 56g of isooctyl acrylate, 24g of butyl acrylate, 18g of methyl acrylate, 0.8g of acrylic acid, 0.6g of hydroxyethyl acrylate and 0.6g of heptadiene, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 30g of toluene and 30g of ethyl acetate are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 70 ℃, when reflux occurs, 0.36g of initiator azodiisobutyronitrile is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed is ensured to be 1h, and the heat is preserved for 1h after the dripping is finished;
(3) Dripping the rest 40g of monomer mixed solution, 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed; the method comprises the steps of carrying out a first treatment on the surface of the
(4) Finally, dripping the rest 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped for 1 hour, and preserving heat for 2 hours after the dripping is completed;
(5) Cooling to room temperature, adding 0.8g of antioxidant Irganox 1010, stirring uniformly, and discharging to obtain the toughened and modified acrylic pressure-sensitive adhesive;
(6) 100g of pressure-sensitive adhesive water is weighed, 1.5g of aliphatic polyisocyanate curing agent L75 is added, 30g of ethyl acetate is added for dilution, stirring is uniform, the mixture is coated on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, the mixture is put into a 100 ℃ oven for 3 minutes, after being taken out, the mixture is compounded on a 25 um transparent polyester release film with release force of 1gf/in-5gf/in, the thickness of a dry adhesive layer is 20um, and the mixture is put into a 50 ℃ oven for curing for 2 days, so that an acoustic adhesive tape sample is obtained.
Example 2
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 40g of isooctyl acrylate, 40g of butyl acrylate, 10g of ethyl acrylate, 3.5g of acrylonitrile, 5g of isobornyl acrylate, 0.3g of methacrylic acid, 0.8g of hydroxypropyl acrylate and 0.4g of octadiene, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 45g of toluene and 15g of methyl acetate are taken and transferred into a four-mouth flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 75 ℃, when reflux occurs, 0.24g of initiator benzoyl peroxide is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed is ensured to be over 1h, and the heat is preserved for 1h after the dripping is over;
(3) The rest 40g of monomer mixed solution, 30g of toluene, 15g of methyl acetate and 0.08g of initiator benzoyl peroxide are dropwise added into a reaction container at a constant speed, so that the completion of dropwise adding of the initiator for 1h is ensured, and the heat preservation is carried out for 1.5h after the completion of dropwise adding;
(4) Finally, dripping the rest 45g of toluene and 0.08g of benzoyl peroxide serving as an initiator into a reaction container at a constant speed, ensuring that the dripping of the initiator is finished for 1 hour, and preserving heat for 2 hours after the dripping is finished;
(5) Cooling to room temperature, adding 0.8g of antioxidant Irganox 1010, stirring uniformly, and discharging to obtain toughened and modified acrylic pressure-sensitive adhesive;
(6) 100g of toughened and modified acrylic pressure-sensitive adhesive is weighed, 0.8g of epoxy curing agent GA240 is added, 50g of ethyl acetate is added for dilution, stirring is uniform, the mixture is coated on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, the film is put into a 100 ℃ oven for 3 minutes, after the film is taken out, the composite release force is 1gf/in-5gf/in on a 25 um transparent polyester release film, the thickness of a dry adhesive layer is 20um, and the film is put into a 50 ℃ oven for curing for 2 days, so that an acoustic adhesive tape sample is obtained.
Example 3
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 65g of isooctyl acrylate, 15g of ethyl acrylate, 10g of methyl acrylate, 7g of isobornyl methacrylate, 1.2g of methacrylic acid, 1.5g of hydroxyethyl acrylate and 0.3g of octadiene, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 40g of ethyl acetate and 20g of butanone are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 78 ℃, when reflux occurs, 0.24g of initiator azo-diisovaleronitrile is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed of the initiator is ensured to be 1h, and the heat is preserved for 1h after the dripping is finished;
(3) Dripping the rest 40g of monomer mixed solution, 45g of ethyl acetate, 15g of butanone and 0.08g of initiator azo-diisovaleronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed;
(4) Finally, the rest 45g of ethyl acetate and 0.08g of initiator azodiisovaleronitrile are dropwise added into the reaction vessel at a constant speed, so that the completion of the dropwise addition of the initiator for 1 hour is ensured, and the heat preservation is carried out for 2 hours after the completion of the dropwise addition;
(5) Cooling to room temperature, adding 0.8g of antioxidant Irganox 1010, stirring uniformly, and discharging to obtain toughened and modified acrylic pressure-sensitive adhesive;
(6) Weighing 100g of toughened and modified acrylic pressure-sensitive adhesive, adding 0.5g of amino curing agent EC-83, adding 40g of ethyl acetate for dilution, uniformly stirring, coating on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, putting into a 100 ℃ oven for 3 minutes, taking out, compounding the 25 um transparent polyester release film with release force of 1gf/in-5gf/in, controlling the thickness of a dry adhesive layer to 20um by adopting an automatic film coater, and putting into the 50 ℃ oven for curing for 2 days to obtain an acoustic adhesive tape sample.
Example 4
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 70g of 2-ethylhexyl acrylate, 10g of lauryl acrylate, 6g of methyl acrylate, 10g of hydroxyethyl methacrylate, 3g of styrene, 0.25g of methacrylic acid, 0.5g of hydroxyethyl acrylate and 0.25g of heptadiene, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 30g of butyl acetate and 30g of butanone are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 80 ℃, when reflux occurs, 0.42g of initiator benzoyl peroxide is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed is ensured to be over 1h, and the heat is preserved for 1h after the dripping is over;
(3) Dripping the rest 40g of monomer mixed solution, 45g of butyl acetate and 0.14g of initiator benzoyl peroxide into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed;
(4) Finally, dripping the rest 45g of ethyl acetate and 0.14g of initiating agent benzoyl peroxide into a reaction container at a constant speed, ensuring that the initiator is completely dripped for 1h, and preserving heat for 2h after the dripping is completed;
(5) Cooling to room temperature, adding 168.6 g of antioxidant, stirring uniformly, and discharging to obtain toughened and modified acrylic pressure-sensitive adhesive;
(6) Weighing 100g of toughened and modified acrylic pressure-sensitive adhesive, adding 1g of aluminum acetylacetonate curing agent, adding 30g of ethyl acetate for dilution, uniformly stirring, coating on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, putting into a 100 ℃ oven for 3 minutes, taking out, compounding the adhesive on a 25 um transparent polyester release film with release force of 1gf/in-5gf/in, controlling the thickness of a dry adhesive layer to 20um by adopting an automatic film coater, and curing for 2 days in the oven at 50 ℃ to obtain an acoustic adhesive tape sample.
Example 5
(1) 15g of isooctyl acrylate, 70.5g of butyl acrylate, 5g of methyl acrylate, 8g of hydroxyethyl methacrylate, 0.5g of acrylic acid, 0.3g of methacrylic acid, 0.4g of hydroxypropyl acrylate and 0.3g of heptadiene are weighed and uniformly mixed to obtain a monomer mixed solution for standby;
(2) 60g of monomer mixed solution and 60g of butyl acetate are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 80 ℃, when reflux occurs, 0.24g of initiator benzoyl peroxide is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed is ensured to be over 1h, and the heat is preserved for 1h after the dripping is over;
(3) Dripping the rest 40g of monomer mixed solution, 45g of ethyl acetate and 0.08g of initiator benzoyl peroxide into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed; the method comprises the steps of carrying out a first treatment on the surface of the
(4) Finally, the rest 45g of ethyl acetate and 0.08g of initiator benzoyl peroxide are dropwise added into the reaction container at a constant speed, so that the completion of the dropwise addition of the initiator for 1 hour is ensured, and the heat preservation is carried out for 2 hours after the completion of the dropwise addition;
(5) Cooling to room temperature, adding 168.6 g of antioxidant, stirring uniformly, and discharging to obtain toughened and modified acrylic pressure-sensitive adhesive;
(6) Weighing 100g of toughened and modified acrylic pressure-sensitive adhesive, adding 0.5g of aziridine curing agent, adding 35g of ethyl acetate, diluting, uniformly stirring, coating on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, putting into a 100 ℃ oven for 3 minutes, taking out, compounding the 25 um transparent polyester release film with release force of 1gf/in-5gf/in, controlling the thickness of a dry adhesive layer to 20um by adopting an automatic film coater, and putting into the 50 ℃ oven for curing for 2 days to obtain an acoustic adhesive tape sample.
Comparative example 1
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 56g of isooctyl acrylate, 24g of butyl acrylate, 18g of methyl acrylate, 0.8g of acrylic acid, 0.6g of hydroxyethyl acrylate and 0.6g of heptadiene, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 30g of toluene and 30g of ethyl acetate are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, stirring at a speed of 200r/min, heating to 70 ℃, adding 0.36g of initiator azodiisobutyronitrile into the mixture once when reflux occurs, and preserving heat for 2h after the dripping is completed;
(3) Dripping the rest 40g of monomer mixed solution, 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed; the method comprises the steps of carrying out a first treatment on the surface of the
(4) Finally, dripping the rest 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped for 1 hour, and preserving heat for 2 hours after the dripping is completed;
(5) Cooling to room temperature, adding 0.8g of antioxidant Irganox 1010, stirring uniformly, and discharging to obtain toughened and modified acrylic pressure-sensitive adhesive;
(6) Weighing 100g of toughened and modified acrylic pressure-sensitive adhesive, adding 1.5g of aliphatic polyisocyanate curing agent L75, adding 30g of ethyl acetate for dilution, uniformly stirring, coating on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, putting into a 100 ℃ oven for 3 minutes, taking out, compounding the 25 um transparent polyester release film with release force of 1gf/in-5gf/in, controlling the thickness of a dry adhesive layer to 20um by adopting an automatic film coater, and putting into the 50 ℃ oven for curing for 2 days to obtain an acoustic adhesive tape sample.
Comparative example 2
The formulation and synthesis were the same as in example 1, except that the antioxidant Irganox 1010 was not added.
Comparative example 3
A method for preparing a high temperature resistant acrylic pressure sensitive adhesive, comprising the following steps:
(1) Weighing 56g of isooctyl acrylate, 24g of butyl acrylate, 18g of methyl acrylate, 1.1g of acrylic acid and 0.9g of hydroxyethyl acrylate, and uniformly mixing to obtain a monomer mixed solution for later use;
(2) 60g of monomer mixed solution, 30g of toluene and 30g of ethyl acetate are taken and transferred into a four-neck flask with a thermometer and a stirring paddle, and N is introduced 2 After 30min of replacement, the stirring speed is 200r/min, the temperature is raised to 70 ℃, when reflux occurs, 0.36g of initiator azodiisobutyronitrile is dripped into the mixture at a constant speed, the dripping speed is controlled, the dripping speed is ensured to be 1h, and the heat is preserved for 1h after the dripping is finished;
(3) Dripping the rest 40g of monomer mixed solution, 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed;
(4) Finally, dripping the rest 45g of toluene and 0.12g of initiator azodiisobutyronitrile into a reaction container at a constant speed, ensuring that the initiator is completely dripped for 1 hour, and preserving heat for 2 hours after the dripping is completed;
(5) Cooling to room temperature, adding 0.8g of antioxidant Irganox 1010, stirring uniformly, and discharging to obtain acrylic pressure-sensitive adhesive;
(6) 100g of acrylic pressure-sensitive adhesive is weighed, 1.5g of aliphatic polyisocyanate curing agent L75 is added, 30g of ethyl acetate is added for dilution, stirring is uniform, the mixture is coated on a 50um transparent polyester release film with release force of 15gf/in-25gf/in, the mixture is put into a 100 ℃ oven for 3 minutes, after the mixture is taken out, the mixture is compounded on a 25 um transparent polyester release film with release force of 1gf/in-5gf/in, the thickness of a dry adhesive layer is controlled to be 20um by adopting an automatic film coater, and the mixture is put into the 50 ℃ oven for curing for 2 days, so that an acoustic adhesive tape sample is obtained.
The properties of the toughening modified pressure-sensitive adhesives in examples 1 to 5 and comparative examples 1 to 3 described above were tested as follows:
1. peel force: the test was performed by referring to GB/T2792 2014 test prescription for adhesive tape peel strength, and stainless steel plate and PP plate were used for the test, respectively.
2. Initial adhesion: the measurement was carried out according to GB/T4852 2002 method for testing the initial tackiness of pressure-sensitive adhesive tapes (Rolling ball method).
3. Holding force: the measurement was carried out in accordance with GB/T4851 2014 test formulation for adhesive tape holding Property.
4. Temperature resistance: adhering the adhesive tape for testing on a steel plate, rolling for 3 times by using a2 kg press roller, standing for 20min, putting the steel plate into a baking oven at 150 ℃ for baking for 60min, taking the steel plate out of the baking oven for cooling for 2h, tearing the test adhesive tape from the steel plate at a constant speed, and observing whether residual adhesive exists on the steel plate; the pressure sensitive adhesive needs to have higher storage modulus under the high-temperature working process of the vibrating diaphragm, and if the storage modulus is low under the high temperature, the flowing property is enhanced, so that the vibrating diaphragm element can be distorted badly under vibration.
5. Film forming property: taking a solid stainless steel ring with d=20mm and t=3mm, placing the steel coil on a pressure-sensitive adhesive tape for 24 hours in a dead weight mode, lifting the steel ring at a constant speed, and observing the highest height of the pressure-sensitive adhesive layer from the release film (until the pressure-sensitive adhesive layer breaks).
6. Resonant frequency F0: and (3) the 25 mu m release film of the pressure-sensitive adhesive layer is removed and is attached to a 40 mu m TPEE functional film through a pressing roller, after the 50 mu m release film on the other side of the pressure-sensitive adhesive layer is removed, the 40 mu m TPEE functional film is attached through the pressing roller, so that a three-layer vibrating film material is formed, and the FO value of the vibrating film material is tested.
The test results are shown in Table 1.
TABLE 1
As can be seen from the performance test of Table 1, the acoustic adhesive tape obtained by the invention has higher peeling force on different back-attached object steel plates and PP plates, and has excellent temperature resistance, holding viscosity, film forming property and lower FO. Solves the defect that the peel strength, the holding viscosity, the film forming property and the temperature resistance of the common polyacrylate pressure-sensitive adhesive can not be considered.
Compared with the examples, the comparative example 1 has lower relative molecular mass, poor cohesion and poor holding viscosity due to the too high speed of the polymerization stage, and is resistant to temperature difference. Comparative example 2 was poor in temperature resistance due to the absence of antioxidant. Comparative example 3 was poor in film forming property because it was not modified with a toughening modifier.
The foregoing detailed description of an acoustic tape and method of making the same, with reference to the examples, is illustrative and not limiting, and several examples can be listed within the scope of the invention and therefore variations and modifications within the scope of the invention should be considered as falling within the scope of the invention.
Claims (10)
1. The acoustic adhesive tape is characterized in that the acoustic adhesive tape is obtained by uniformly mixing a toughening modified pressure-sensitive adhesive, a curing agent and a diluent, then coating the mixture on a release film, and drying and curing the mixture; the toughening modified pressure-sensitive adhesive comprises the following raw materials in parts by weight: 50 to 95 parts of toughening monomer, 5 to 25 parts of temperature resistant monomer, 0.5 to 5 parts of crosslinking monomer, 0.1 to 5 parts of toughening modifier, 0.15 to 0.8 part of initiator, 0.5 to 2 parts of anti-aging agent and 60 to 200 parts of solvent.
2. The acoustic tape of claim 1, wherein the toughening monomer is any one or more of 2-ethylhexyl acrylate, isooctyl acrylate, butyl acrylate, lauryl acrylate, ethyl acrylate, isobutyl acrylate, and hydroxybutyl acrylate.
3. The acoustic tape of claim 1, wherein the temperature resistant monomer is any one or more of cyclohexyl methacrylate, hydroxyethyl methacrylate, styrene, acrylonitrile, methyl acrylate, methyl methacrylate, vinyl acetate, isobornyl acrylate.
4. The acoustic tape of claim 1, wherein the cross-linking monomer is any one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, itaconic acid.
5. The acoustic tape of claim 1, wherein the toughening modifier is any one or more of heptadiene, isoprene, octadiene, methyl cardiac maleate.
6. The acoustic tape of claim 1, wherein the initiator is any one or more of azobisisobutyronitrile, azobisisovaleronitrile, benzoyl peroxide.
7. The acoustic tape of claim 1, wherein the anti-aging agent is any one or more of an amine anti-aging agent and a phenolic anti-aging agent.
8. The acoustic tape of claim 1, wherein the solvent is any one or more of toluene, ethyl acetate, butyl acetate, methyl acetate, butanone.
9. The acoustic tape of claim 1, wherein the curing agent is any one or more of an amino resin, an epoxy resin, an aziridine, a metal salt, an isocyanate; the weight ratio of the toughening modified pressure-sensitive adhesive to the curing agent to the diluent is 1: 0.005-0.015: 0.3 to 0.5.
10. The method of preparing an acoustic tape according to any one of claims 1 to 9, comprising the steps of:
(1) Uniformly mixing a toughening monomer, a temperature-resistant monomer, a crosslinking monomer and a toughening modifier to obtain a monomer mixed solution;
(2) Under the protection of inert gas, uniformly mixing 60% of monomer mixed solution and 40% of solvent in a reaction container, heating to 70-80 ℃, dropwise adding 60% of initiator at a uniform speed when reflux occurs, controlling the dropwise adding speed, ensuring that the dropwise adding of the initiator is completed for 1h, and preserving heat for 1h after the dropwise adding is completed;
(3) Dripping the rest 40% of monomer mixed solution, 30% of solvent and 20% of initiator into a reaction container at a constant speed, ensuring that the initiator is completely dripped, and preserving heat for 1.5h after the dripping is completed;
(4) Finally, dripping the rest 30 percent of solvent and 20 percent of initiator into a reaction container at a constant speed, ensuring that the dripping of the initiator is completed for 1 hour, preserving heat for 2 hours after the dripping is completed, cooling to room temperature, adding an antioxidant, and uniformly stirring to obtain the toughening modified pressure-sensitive adhesive;
(5) Adding a curing agent into the toughening modified pressure-sensitive adhesive, adding a diluent for dilution, coating on a release film, drying, attaching the release film, and curing to obtain the acoustic adhesive tape.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117534900A (en) * | 2024-01-09 | 2024-02-09 | 瑞声光电科技(常州)有限公司 | Rubber sound membrane, sound production device and application thereof |
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2022
- 2022-12-30 CN CN202211723711.2A patent/CN116023879A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117534900A (en) * | 2024-01-09 | 2024-02-09 | 瑞声光电科技(常州)有限公司 | Rubber sound membrane, sound production device and application thereof |
| CN117534900B (en) * | 2024-01-09 | 2024-04-09 | 瑞声光电科技(常州)有限公司 | Rubber sound membrane, sound production device and application thereof |
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