High-stripping foam tape and preparation method thereof

Abstract

The preparation method comprises the following steps: mixing and reacting a rubber elastomer, an acrylic monomer, an initiator and an antioxidant to obtain an acrylic acid grafted modified resin solution, and mixing the acrylic acid grafted modified resin solution with tackifying resin, a softening agent and a curing agent to obtain a first mixed glue solution; adding foaming microspheres into the first mixed glue solution to obtain a second mixed glue solution; coating a first release film with the first mixed glue solution to obtain a first mixed glue solution layer; coating a second release film with the second mixed glue solution to obtain a second mixed glue solution layer; the first mixed glue solution layer is attached to the second mixed glue solution layer to be foamed and cured, and the high-stripping foam tape is obtained. The acrylic acid grafted modified resin increases crosslinking points and cohesion, improves heat resistance and chemical resistance, provides a high-elasticity and high-strength skeleton for a system, and the tackifying resin is dissolved in the skeleton to greatly reduce the viscosity of the system, so that the pressure sensitive characteristic is improved, the tackifying resin quickly flows and infiltrates an adhered object, and the high-stripping and high-elasticity foam tape is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foam tape, in particular to a high-peeling foam tape and a preparation method thereof. BACKGROUND

[0002] Foam is widely used in electronic products due to its good cushioning performance and compressibility, and can be divided into conductive foam, cushioning foam, double-sided adhesive foam and dustproof and waterproof foam according to the use. Different uses and positions have completely different requirements for foam. 3C electronic products pay more attention to the lightness, thinness and high bonding strength of foam adhesive, while the automotive field pays more attention to the weather resistance, high temperature resistance and impact resistance of foam adhesive.

[0003] With the demand for lightweight and integration of electronic products, a large number of tape products will be used in the process to fix and bond components. Among them, the tape product needs to be thinner and have good adhesion and cushioning performance. Under the trend of lightness and thinness, the resilience of the foam is reduced after being thinned, and the cushioning performance is weakened, and it is difficult to balance high-strength bonding and cushioning performance. At the same time, the traditional foam tape generally adopts a multi-layer structure, which is relatively complex and high in cost. The present application is a single-layer self-adhesive foam structure, which effectively reduces the cost.

[0004] At the same time, the foam tape generally realizes high peeling force by adding tackifying resin, however, when the amount of tackifying resin in the traditional acrylic pressure-sensitive adhesive system reaches a certain proportion, the viscoelastic synergy of the system will be destroyed, and the peeling force will decrease rapidly. The amount of tackifying resin in the traditional acrylic pressure-sensitive adhesive system is limited, and it is difficult to obtain a high-peeling-force tape. The solubility of the rubber system is lower than that of the acrylic system, and is closer to the tackifying resin. The proportion of tackifying resin can be significantly increased to obtain a product with higher peeling strength, but the crosslinking density is low, and the performance such as temperature resistance limits the application scenario.

[0005] Therefore, it is of great significance to develop a foam tape with simple structure, low cost, high peeling force and high elasticity. SUMMARY

[0006] The present application provides a high-peeling foam tape and a preparation method thereof to solve the problems in the prior art. The acrylic grafted modified resin is obtained by reacting the rubber elastomer and the acrylic monomer to increase the crosslinking points and cohesion, improve the heat resistance and chemical resistance, and provide a high-elasticity and high-strength skeleton for the system. The tackifying resin can be well dissolved in the skeleton to greatly reduce the viscosity of the system, thereby improving the pressure-sensitive properties, flowing quickly and infiltrating the adherend to obtain a foam tape with high peeling and high elasticity.

[0007] To solve the above technical problems, the present application provides a preparation method of a high-peeling foam tape, comprising the following steps:

[0008] S1, the rubber elastomer, acrylic monomer and solvent are mixed to remove oxygen, heated and then an initiator is added to react, and then an antioxidant is added to obtain an acrylic grafted modified resin solution;

[0009] S2, the acrylic modified resin solution and tackifying resin are mixed, a softening agent and a curing agent are added to obtain a first glue mixing liquid; the first glue mixing liquid is taken and foamed microspheres are added to obtain a second glue mixing liquid;

[0010] S3, the first glue mixing liquid is coated on the first release film, dried and then pre-cured to obtain a first glue mixing liquid layer; the second glue mixing liquid is coated on the second release film and dried to obtain a second glue mixing liquid layer;

[0011] S4, the first glue mixing liquid layer on the first release film is attached to the second glue mixing liquid layer on the second release film, the first release film is removed after foaming, and the high peel foam tape is obtained after curing.

[0012] The acrylic grafted modified resin is obtained by grafting modification of the rubber elastomer, the crosslinking points and cohesion are increased, the heat resistance and chemical resistance are improved, a high-elasticity and high-strength skeleton is provided for the system, the tackifying resin can be well dissolved in the skeleton to greatly reduce the viscosity of the system, thereby improving the pressure-sensitive characteristics, rapidly flowing and infiltrating the adherend, and the high-peel and high-elasticity foam tape is obtained.

[0013] In the application, the first glue mixing liquid layer without foamed microspheres is attached to the second glue mixing liquid layer to be foamed, in the high-temperature foaming process, the first glue mixing liquid layer and the second glue mixing liquid layer are in a molten flow state, the two are infiltrated, and the first glue mixing liquid layer can effectively prevent the foamed microspheres on the surface of the second glue mixing liquid layer from expanding and overflowing, so that the foamed microspheres are limited to expand from the surface to the inside of the second glue mixing liquid layer, the surface cell rate is greatly reduced, and the problem that a large number of cells are formed on the surface of the foamed tape after foaming to reduce the peel strength is avoided. The surface layer of the second glue mixing liquid layer close to the second release film has good wettability with the second release film during coating, and then the foamed microspheres are not easy to form cells on this side, and then the first glue mixing liquid layer is attached to the side away from the second release film.

[0014] Due to the high-elasticity and high-strength skeleton, the application provides a higher foaming ratio space for the system, and can meet the requirements of a wider range of foam densities and thicknesses under the premise of ensuring certain performance.

[0015] Further, in S1, the mass ratio of the rubber elastomer, the acrylic monomer and the solvent is 100: (10-40) : (300-600).

[0016] Further, in S1, the mass fractions of the components are as follows: rubber elastomer 100 parts, acrylic monomer 10-40 parts, solvent 300-600 parts, initiator 0.1-2 parts, and antioxidant 0.2-2 parts.

[0017] Further, in S1, the reaction temperature is 75-78℃, and the reaction time is 6-8h.

[0018] Further, in S1, the rubber elastomer is selected from one or more of SBR (styrene butadiene rubber), SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SIBS (styrene-isoprene / butadiene-styrene block copolymer), NBR (nitrile rubber), and wherein the content (mass fraction) of hard segments is <20%.

[0019] The present application limits the mass ratio of acrylic monomer to rubber elastomer and the content of hard segments of the rubber elastomer, because with low content of hard segments, grafting a small amount of acrylic monomer can exhibit good viscoelastic properties: in the early stage of the reaction, the monomer free radicals are relatively balanced with the rubber free radicals, and the rubber free radicals / rubber-grafted monomer polymer free radicals easily capture the acrylic molecular chain radicals to terminate the reaction, there are fewer free acrylic chain segments outside the grafting system, the tackifying resin has good compatibility in the system, and the system has better cohesion. If the content of hard segments is too high, and the mass ratio of acrylic monomer to rubber elastomer is too high, there are a large number of acrylic monomer free radicals in the early stage of the reaction, and the main reaction is the addition polymerization of acrylic monomer free radicals to consume the acrylic monomer in the system to form a large number of acrylic macromolecular segments free in the rubber grafting system, which is easy to produce phase separation.

[0020] Further, in S1, the acrylic monomer is a mixture of a first monomer and a second monomer.

[0021] The first monomer is selected from one or more of butyl acrylate, butyl methacrylate, heptyl acrylate, heptyl methacrylate, isooctyl acrylate, and isooctyl methacrylate.

[0022] The second monomer is selected from one or more of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate, and hydroxybutyl methacrylate.

[0023] Further, in S1, the solvent is a mixed solvent of a high-boiling-point solvent and a low-boiling-point solvent.

[0024] The high-boiling-point solvent is selected from one or more of toluene, xylene, methylcyclohexane, and cyclohexanone.

[0025] The low-boiling-point solvent is selected from one or more of ethyl acetate and butyl acetate. The two mixed solvents can ensure good uniform dispersibility of the system in the mixing and dispersion of components and subsequent process steps.

[0026] Further, in S2, the mass ratio of the acrylic modified resin solution and tackifying resin is 500:(35-70).

[0027] Further, in S2, the first glue mixing solution further comprises color paste, wherein the mass fraction of each component is: acrylic modified resin solution 500 parts, tackifying resin 35-70 parts, softener 1-10 parts, curing agent 0.1-5 parts, color paste 2-10 parts; the mass ratio of the acrylic modified resin solution and foaming microspheres in the second glue mixing solution is 500:(3-4). Preferably, the softener, color paste and foaming microspheres can be added to the system after being dispersed by ethyl acetate.

[0028] Further, in S2, the tackifying resin is one or several of terpene resin, terpene phenol resin, terpene phenol aldehyde resin, aromatic modified terpene resin, hydrogenated terpene resin, rosin derivative, petroleum resin.

[0029] Further, the initiator is one or several of benzoyl peroxide (BPO), azobis isobutyronitrile (AIBN), dilauroyl peroxide (LPO), tert-amyl peroxy-2-ethylhexanoate (TAPO), tert-amyl peroxy-2-ethylhexanoate (TAPO), dihydroxy peroxide cyclohexane (BHCP).

[0030] Further, the antioxidant is one or several of hindered phenol, aromatic amine, thioester.

[0031] Further, the softener is one or several of white oil, naphthenic oil, paraffin oil, tall oil ester, hydrogenated rosin glyceride, polyester, polyether.

[0032] Further, the curing agent is one or several of isocyanate, pyridine, amino resin, epoxy group-containing resin, tetraisopropoxy titanium, inorganic salt.

[0033] Further, the foaming microsphere is a hollow microsphere with a thermoplastic polymer shell, and the inside is filled with a low-boiling low alkane liquid such as isopentane.

[0034] Further, in S3, the thickness of the first glue mixing solution layer is <10 μm, and the thickness of the second glue mixing solution layer is 50-120 μm.

[0035] Further, in S3 and S4, the pre-curing and curing temperature is 42-48℃, and the time is 70-74h.

[0036] The foaming temperature is 150-155℃, and the time is 3-4min.

[0037] The second aspect of the present application provides the high-peeling foam tape prepared by the preparation method of the first aspect.

[0038] The present application obtains an acrylic graft modified resin by grafting and modifying the rubber elastomer, increases the crosslinking points and cohesion, improves the heat resistance and chemical resistance, provides a high-elasticity and high-strength skeleton for the system, and the tackifying resin can be well dissolved in the skeleton to greatly reduce the viscosity of the system, thereby improving the pressure-sensitive characteristics, rapidly flowing and wetting the adherend, and obtaining the high-peeling and high-elasticity foam tape.

[0039] In the present application, the second adhesive solution layer to be foamed is attached to the first adhesive solution layer with matured crosslinking and without foaming microspheres, and in the high-temperature foaming process, the first adhesive solution layer and the second adhesive solution layer are in a molten flow state, and the two are wetted, and the first adhesive solution layer can effectively prevent the foaming microspheres on the surface of the second adhesive solution layer from swelling and overflowing, so that the foaming microspheres are limited to swell from the surface to the inside of the second adhesive solution layer, greatly reducing the surface cell rate and improving the effective area and wetting effect of the product on the adherend. DETAILED DESCRIPTION

[0040] The technical solutions of the present application will be clearly and completely described below in combination with specific embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] The present embodiment relates to a preparation method of a high-peeling foam tape, comprising the following steps:

[0042] S1, mixing the rubber elastomer, acrylic monomer and solvent to remove oxygen, heating and adding an initiator to react, then adding an antioxidant to obtain an acrylic graft modified resin solution;

[0043] S2, mixing the acrylic modified resin solution and tackifying resin, adding a softening agent and a curing agent to obtain a first adhesive solution, and taking the first adhesive solution to add foaming microspheres to obtain a second adhesive solution;

[0044] S3, coating the first adhesive solution on a first release film, pre-matured after drying, to obtain a first adhesive solution layer, and coating the second adhesive solution on a second release film, drying to obtain a second adhesive solution layer;

[0045] S4, attaching the first adhesive solution layer on the first release film to the second adhesive solution layer on the second release film, tearing off the first release film after foaming, and obtaining a high-peeling foam tape after maturation.

[0046] The embodiment obtains an acrylic graft modified resin by grafting modification of the rubber elastomer, increases crosslinking points and cohesion, improves heat resistance and chemical resistance, provides a high-elasticity and high-strength skeleton for the system, and the tackifying resin can be well dissolved in the skeleton to greatly reduce the viscosity of the system, thereby improving the pressure-sensitive property, quickly flowing and wetting the adherend, and obtaining a high-peeling and high-elasticity foam tape; the first mixed glue liquid layer without foaming microspheres is attached to the second mixed glue liquid layer to be foamed, and the first mixed glue liquid layer and the second mixed glue liquid layer are in a molten flow state during the high-temperature foaming process, and are integrated. The above first mixed glue liquid layer can effectively prevent the foaming microspheres on the surface of the second mixed glue liquid layer from expanding and overflowing, so that the foaming microspheres are limited to expand from the surface of the second mixed glue liquid layer to the inside, greatly reducing the surface cell rate and avoiding the problem that a large number of cells are formed on the surface of the foamed tape to reduce the peeling force. The surface layer of the second mixed glue liquid layer close to the second release film has good wettability with the second release film during coating, and the foaming microspheres are not easy to form cells on this side, and thus the first mixed glue liquid layer is attached only on the side away from the second release film.

[0047] As a preferred embodiment, in S1, the mass ratio of the rubber elastomer, the acrylic monomer and the solvent is 100:(10-40):(300-600); the mass fraction of each component is: rubber elastomer 100 parts, acrylic monomer 10-40 parts, solvent 300-600 parts, initiator 0.1-2 parts, antioxidant 0.2-2 parts; the reaction temperature is 75-78℃, and the reaction time is 6-8h.

[0048] As a preferred embodiment, in S1, the rubber elastomer is selected from one or more of SBR (styrene-butadiene rubber), SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SIBS (styrene-isoprene / butadiene-styrene block copolymer), NBR (nitrile rubber), and the content (mass fraction) of the hard segment is <20%. The acrylic monomer is a mixture of a first monomer and a second monomer; the first monomer is selected from one or more of butyl acrylate, butyl methacrylate, heptyl acrylate, heptyl methacrylate, isooctyl acrylate, and isooctyl methacrylate; the second monomer is selected from one or more of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, and hydroxybutyl acrylate. The solvent is a mixed solvent of a high-boiling-point solvent and a low-boiling-point solvent; the high-boiling-point solvent is selected from one or more of toluene, xylene, methylcyclohexane, and cyclohexanone; and the low-boiling-point solvent is selected from one or more of ethyl acetate and butyl acetate. The two mixed solvents can make the system maintain good uniform dispersibility during component mixing and dispersion and subsequent process steps.

[0049] As a preferred embodiment, in S2, the mass ratio of the acrylic modified resin solution and tackifying resin is 500:(35-70). The first glue mixing solution also includes color paste, wherein the mass fraction of each component is: acrylic modified resin solution 500 parts, tackifying resin 35-70 parts, softener 1-10 parts, curing agent 0.1-5 parts, color paste 2-10 parts; the mass ratio of the acrylic modified resin solution and foaming microspheres in the second glue mixing solution is 500:(3-4). Preferably, the softener, color paste and foaming microspheres can be added to the system after being dispersed by ethyl acetate. The tackifying resin is one or several of terpene resin, terpene phenol resin, terpene phenolic resin, aromatic modified terpene resin, hydrogenated terpene resin, rosin derivative, petroleum resin.

[0050] Specifically, the initiator is one or several of benzoyl peroxide (BPO), azobis isobutyronitrile (AIBN), dilauroyl peroxide (LPO), tert-amyl peroxy-2-ethylhexanoate (TAPO), tert-amyl peroxy-2-ethylhexanoate (TAPO), dihydroxy peroxide cyclohexane (BHCP). The antioxidant is one or several of hindered phenol, aromatic amine, thioester. The softener is one or several of white oil, naphthenic oil, paraffin oil, tall oil ester, hydrogenated rosin glyceride, polyester, polyether. The curing agent is one or several of isocyanate, pyridine, amino resin, epoxy group-containing resin, tetraisopropoxy titanium, inorganic salt. The foaming microspheres are hollow microspheres with a thermoplastic polymer shell, filled with low-boiling low alkane liquid such as isopentane inside.

[0051] As a preferred embodiment, in S3, the thickness of the first glue mixing solution layer is <10 μm, and the thickness of the second glue mixing solution layer is 50-120 μm.

[0052] As a preferred embodiment, in S3 and S4, the pre-curing and curing temperature is 42-48℃, and the time is 70-74h; the foaming temperature is 150-155℃, and the time is 3-4min.

[0053] Example 1

[0054] This embodiment relates to a preparation method of high-peeling foam tape, comprising the following steps:

[0055] (1) Rubber elastomer (SIS, hard segment content 16%) 100 parts, acrylic monomer (butyl acrylate: acrylic acid = 90:10) 35 parts, mixed solvent (toluene: ethyl acetate = 8:2) 500 parts were added to the reaction kettle, stirred, dissolved and dispersed uniformly, after deoxidation, heated to 75°C, 1 part of initiator (BPO) was added for 6 hours, 1 part of hindered phenolic antioxidant was added to the reaction kettle and stirred to disperse uniformly to obtain an acrylic grafted modified resin solution;

[0056] (2) The acrylic grafted modified resin solution obtained in step (1) 500 parts, tackifying resin (Foral 85) 50 parts were stirred, dissolved and dispersed uniformly, then 5.26 parts of softener (NYTEX 4800), 8.5 parts of color paste (JQ1908) were added, and then 3.0 parts of curing agent (L-75) was added after being dispersed uniformly to obtain a first glue mixing liquid; Take the first glue mixing liquid, add foaming microspheres (Expancel 920DU40), and the mass ratio of acrylic grafted modified resin solution to foaming microspheres is 500:3;

[0057] (3) The first glue mixing liquid was coated on the first release film (PET, thickness 25μm), dried at 100°C for 4min, and pre-cured at 45°C for 72h to obtain a first glue mixing liquid layer (thickness 8μm); The second glue mixing liquid was coated on the second release film (PET, thickness 25μm), dried at 100°C for 4min to obtain a second glue mixing liquid layer (thickness 60μm);

[0058] (4) The first glue mixing liquid layer on the first release film was attached to the second glue mixing liquid layer on the second release film, and the first release film was removed after foaming, and pre-cured at 45°C for 72h to obtain a high-peeling foam tape.

[0059] Example 2

[0060] The difference between this example and Example 1 is that the tackifying resin is adjusted to 70 parts, the curing agent is adjusted to 3.4 parts, the mass ratio of acrylic grafted modified resin solution to foaming microspheres is 500:3.4, and other steps and parameters remain unchanged.

[0061] Example 3

[0062] The difference between this example and Example 1 is that the tackifying resin is replaced by GA90, and other steps and parameters remain unchanged.

[0063] Example 4

[0064] The difference between this example and Example 3 is that the tackifying resin is adjusted to 70 parts, the curing agent is adjusted to 3.4 parts, the mass ratio of acrylic grafted modified resin solution to foaming microspheres is 500:3.4, and other steps and parameters remain unchanged.

[0065] Example 5

[0066] The difference between this example and Example 1 is that the tackifying resin is replaced by TP-7042, and other steps and parameters remain unchanged.

[0067] Example 6

[0068] The difference between this example and Example 5 is that the tackifying resin is adjusted to 70 parts, the curing agent is adjusted to 3.4 parts, the mass ratio of the acrylic acid grafting modified resin solution to the foamed microspheres is 500:3.4, and other steps and parameters remain unchanged.

[0069] Example 7

[0070] The difference between this example and Example 6 is that the tackifying resin is replaced by TP-7042 35 parts + Wingtack95 35 parts, and other steps and parameters remain unchanged.

[0071] Example 8

[0072] The difference between this example and Example 7 is that the softening agent is adjusted to 8.95 parts, and other steps and parameters remain unchanged.

[0073] The foam tape obtained in Examples 1-8 was tested for performance, and the test results are shown in Table 1.

[0074] 180° peeling force test: The peeling force test method refers to the standard ASTM / D3330, and the peeling force against SUS (stainless steel), Al (aluminum), Glass (glass), and PP (polypropylene) is tested.

[0075] DuPont (falling ball) test: A laser cutting machine is used to obtain a character-shaped jig 25mm*21mm, the jig is cleaned with a dust-free cloth using anhydrous ethanol solvent, and the solvent is dried. According to the requirements, one side of the tape is attached to the specified character-shaped jig, and the other side (tear off the release protective layer) is attached to another jig. During the attachment process, a pressure roller is used to avoid air bubbles. A 6kg weight is pressed for 10s, and the sample is placed at room temperature and humidity for 72h (temperature 23℃±2, humidity 50%±5) to complete the sample preparation. The test height is 1m, starting from ball No. 1, testing from small to large, and checking the sample state, until the sample cracks and fails, the test is ended, and the corresponding joule number (w=mgh) of the ball number is recorded.

[0076] High temperature holding adhesion test: the high temperature holding adhesion test method refers to the national standard GB / T 4851, the sample is cut, the size is 25mm*25mm, the base material SUS plate of 06Cr19Ni10 material, the tool is cleaned with anhydrous ethanol, isopropyl alcohol, ethyl acetate solvent with dust-free cloth, and is placed at room temperature for 30min (temperature 23℃±2, humidity 50%±5), and the test base material is marked with an oily pen. The cut sample is attached to the PET backing, the PET thickness is selected according to the hanging weight (usually 25μm / 50μm), then the sample is attached to the base material using a pressure roller to avoid air bubbles, a 6kg weight is pressed for 10s, and after being placed at room temperature for 72h, the sample is placed in a holding oven according to the test requirements, the temperature is raised to 70℃, a 1kg weight is hung, and the sample displacement is recorded after 24h.

[0077] Table 1

[0078]

[0079] Comparative Example 1

[0080] The difference between this comparative example and Example 3 is that the tackifying resin is adjusted to 20 parts, and other steps and parameters remain unchanged.

[0081] Comparative Example 2

[0082] The difference between this comparative example and Example 4 is that the tackifying resin is adjusted to 100 parts, and other steps and parameters remain unchanged.

[0083] Comparative Example 3

[0084] The difference between this comparative example and Example 8 is that the mass ratio of the acrylic acid grafted modified resin solution to the foaming microspheres is 500:1.7, and other steps and parameters remain unchanged.

[0085] Comparative Example 4

[0086] The difference between this comparative example and Example 8 is that the rubber elastomer SIS with a hard segment content of 29% is used in the preparation of the acrylic acid grafted modified resin solution, and other steps and parameters remain unchanged.

[0087] The foam tape obtained in Comparative Examples 1-5 is tested for performance, and the test results are shown in Table 2.

[0088] Table 2

[0089]

[0090] It can be seen from Table 1 and Table 2 that the foam tape obtained in the embodiment of the application has good peeling force, elasticity and high-temperature adhesive holding performance, the peeling force of Comparative Example 1 is obviously decreased due to insufficient amount of tackifying resin, the peeling force of Comparative Example 2 is high but the cohesive failure is obvious due to excessive amount of tackifying resin, the DuPont test performance of Comparative Example 3 is relatively poor due to low content of foaming agent, and the peeling force of Comparative Example 4 is obviously decreased due to high content of hard segment of rubber elastomer.

[0091] The above detailed description of the application is made in combination with the specific embodiments and exemplary examples, but these descriptions cannot be understood as limiting the application. Those skilled in the art understand that the technical solutions and embodiments of the application can be variously replaced, modified or improved without departing from the spirit and scope of the application, and these all fall within the scope of the application. The protection scope of the application is subject to the appended claims.

Claims

1. A method of making a high release foam tape, characterized by, The method comprises the following steps: S1, mixing the rubber elastomer, acrylic monomer and solvent to remove oxygen, heating and adding initiator, then adding antioxidant to obtain an acrylic grafted modified resin solution; S2, mixing the acrylic modified resin solution and tackifying resin, adding softener and curing agent to obtain a first glue mixing solution; taking the first glue mixing solution and adding foaming microspheres to obtain a second glue mixing solution; S3, coating the first glue mixing solution on a first release film, drying and pre-curing to obtain a first glue mixing solution layer; coating the second glue mixing solution on a second release film, drying to obtain a second glue mixing solution layer; S4, laminating the first glue mixing solution layer on the first release film on the second glue mixing solution layer on the second release film, removing the first release film after foaming, and curing to obtain a high-peeling foam tape.

2. The method of producing a high release foam tape according to claim 1, wherein In S1, the mass ratio of the rubber elastomer, the acrylic monomer and the solvent is 100:(10-40):(300-600).

3. The method for preparing high-peel foam tape as described in claim 1, characterized in that, In S1, the rubber elastomer is selected from one or more of SBR, SIS, SBS, SIBS and NBR, and the content of hard segment is less than 20%.

4. The method for preparing high-peel foam tape as described in claim 1, characterized in that, In S1, the acrylic monomer is a mixture of a first monomer and a second monomer; The first monomer is selected from one or more of butyl acrylate, butyl methacrylate, heptyl acrylate, heptyl methacrylate, isooctyl acrylate and isooctyl methacrylate; The second monomer is selected from one or more of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate and hydroxybutyl methacrylate.

5. The method of making a high release foam tape according to claim 1, wherein, In S1, the solvent is a mixed solvent of a high-boiling-point solvent and a low-boiling-point solvent; The high-boiling-point solvent is selected from one or more of toluene, xylene, methylcyclohexane and cyclohexanone; The low-boiling-point solvent is selected from one or more of ethyl acetate and butyl acetate.

6. The method of making a high release foam tape according to claim 1, wherein, In S2, the mass ratio of the acrylic modified resin solution and the tackifying resin is 500:(35-70).

7. The method for preparing high-peel foam tape as described in claim 1, characterized in that, In S2, the tackifying resin is one or more of terpene resin, terpene phenol resin, terpene phenol aldehyde resin, aromatic modified terpene resin, hydrogenated terpene resin, rosin derivative and petroleum resin.

8. The method for preparing high-peel foam tape as described in claim 1, characterized in that, In S3, the thickness of the first glue mixing solution layer is less than 10 μm, and the thickness of the second glue mixing solution layer is 50-120 μm.

9. The method for preparing high-peel foam tape as described in claim 1, characterized in that, In S3 and S4, the pre-curing and curing temperatures are 42-48 ℃, and the time is 70-74 h; The foaming temperature is 150-155 ℃, and the time is 3-4 min.

10. A high-peeling foam tape prepared by the preparation method of any one of claims 1-9.

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