Patch adhesive tape and preparation method thereof

Abstract

The invention discloses a patch adhesive tape and a preparation method thereof. The patch adhesive tape is characterized by mainly comprising a pre-coating layer, a base material layer, an adhesive layer, a release film layer and a release film base material layer which are sequentially overlapped, the coating further comprises an ink layer which is coated on the surface of the pre-coating layer. The adhesive layer is a dried epoxy modified acrylic acid glue solution layer; the epoxy modified acrylic acid glue solution is prepared by mixing the following components in percentage by mass: 30 to 40 percent of improved acrylic acid pressure-sensitive adhesive, 30 to 50 percent of epoxy resin, 0.5 to 3.6 percent of curing agent, 0.3 to 4 percent of defoaming agent, 15 to 25 percent of solvent and 0.5 to 2 percent of aliphatic polyurethane acrylate and / or epoxy acrylate cross-linking agent. The prepared patch adhesive tape has the characteristics of stable viscosity, good corrosion resistance, water and chemical reagent resistance and the like, and is particularly suitable for sealing holes of parts in automobile manufacturing.

Description

Technical Field

[0001] The invention belongs to adhesive tape and its preparation, and relates to a patch adhesive tape and its preparation method. The patch adhesive tape of the invention (prepared) is particularly suitable for sealing holes of parts in automobile manufacturing. Background Art

[0002] Patch tape is usually made of glass fiber cloth and aluminum foil as the base material, coated with epoxy modified acrylic adhesive, and used for process protection of special processes in automobile manufacturing. It is mainly used for sealing automobile holes. The automobile production process requires a variety of holes related to manufacturing and maintenance. If these holes are not blocked later, it may cause sealing and noise problems; further rainwater and other substances will penetrate into the car body through the holes, causing rust on the car body and affecting the life of the car. Some people have also tried to use plastic and rubber to seal the holes, but due to the gap between the car and the increase in the car weight and cost, its further promotion is limited.

[0003] In the prior art, CN115926682A discloses "a butyl rubber hot melt adhesive with good high temperature resistance, a preparation method and a hole plugging patch for automobiles using the same", but its preparation process is complicated, mainly because there are many types of glue synthesis and the process is complicated. The produced tape has high viscosity and the residual glue is difficult to clean on the car body. In addition, the introduction of halogen elements has adverse effects on the human body and the environment. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a patch tape and a preparation method thereof, thereby providing a patch tape and a preparation method thereof having the characteristics of stable viscosity, good corrosion resistance, water resistance and chemical reagent resistance, and no residual adhesive and small molecule precipitation, no pollution to the surface of the object to be attached, playing a great role in protecting the object to be attached during the manufacturing process, and reducing the weight of the automobile structure to a certain extent.

[0005] The present invention provides a patch tape, which is characterized in that the patch tape is mainly composed of a pre-coating layer (2), a substrate layer (3), an adhesive layer (4), a release film layer (5) and a release film substrate layer (6) which are stacked in sequence;

[0006] The pre-coating layer (2) is a pre-coating agent layer after drying, and the pre-coating agent is a water-based polyester primer;

[0007] The adhesive layer (4) is a layer of epoxy-modified acrylic adhesive after drying; the epoxy-modified acrylic adhesive is composed of 30-40% of improved acrylic pressure-sensitive adhesive, 30-50% of epoxy resin, 0.5-3.6% of curing agent, 0.3-4% of defoaming agent, 15-25% of solvent, and 0.5-2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent in mass percentage and components, and the sum of the components is 100%; the adhesive thickness of the adhesive layer 4 is preferably in the range of 5-100 μm;

[0008] The solid content of the epoxy modified acrylic adhesive is preferably 15% to 55%;

[0009] The definition of "solid content" described in this article is: the percentage of the mass of non-volatile matter in 1g sample (i.e. epoxy-modified acrylic adhesive) after baking in an oven at 160°C for 1 hour, and the final solid content is calculated based on the mass of water added and adjusted according to the mass of non-volatile matter.

[0010] The improved acrylic pressure-sensitive adhesive is composed of a mixture of a hard monomer, a soft monomer and methacrylate;

[0011] The improved acrylic pressure-sensitive adhesive is mixed with epoxy resin to form an epoxy-modified acrylic pressure-sensitive adhesive. In the epoxy-modified acrylic pressure-sensitive adhesive, the mass percentage of the hard monomer is preferably greater than or equal to 8%, and the mass percentage of the soft monomer is preferably greater than or equal to 35%. Such a combination can optimize the comprehensive performance of the adhesive.

[0012] The substrate layer (3) is a PET (Polyethylene terephthalate) film, and the thickness of the substrate layer (3) can be 50-300 μm, specifically 50 μm, 75 μm, 100 μm, 125 μm, 150 μm, 200 μm, 300 μm, etc. The production and supply enterprise and product model (brand) of the PET film are: GM3 series films and other existing commercial products produced and provided by Jiangsu Dongcai New Materials Co., Ltd., and the characteristic properties are high temperature resistance, low precipitation, low shrinkage, and high definition;

[0013] The release film layer (5) is a release liquid layer after drying; the release liquid is an organic silicon release liquid, and the product is produced and provided by Dow Chemical and other companies, and the release force is 5 to 36 g / 25 mm;

[0014] The release film substrate layer (6) is the release film substrate, which is glassine paper. The glassine paper is produced by the following enterprises and product models (brands): Daoming Optics G01W80F40, G01W8078-M, Guangzhou Naiheng A1180ER, A1180BM, A1180AH, and Shanghai Baoyan 12A04C-BX; (glassine paper) the release paper has a gram weight range of 30 to 120 g (i.e., the weight of the paper per unit area, g / m2), and a release force range of 5 to 40 g / 25 mm;

[0015] In the content of the present invention: the patch tape also includes an ink layer (1), which is coated on the surface of the pre-coating layer (2), and the ink layer (1) can be a circular, square, irregular or other shaped pattern.

[0016] In the content of the present invention: the hard monomer includes acrylic acid (AA for short), methyl methacrylate (MMA for short), hydroxyethyl acrylate (HEA for short), etc.; the soft monomer includes ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), isobornyl methacrylate (IBOMA for short), etc.; the methacrylate includes lauryl methacrylate, octadecyl methacrylate, etc.; two or more monomers are selected according to the glass transition temperature Tg value to design the hardness and softness of the glue, and the methacrylate with good water resistance is added at the same time;

[0017] In the present invention, the curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate (IPDI for short), hexamethylene diisocyanate (HDI for short), and dicyclohexylmethane diisocyanate (H12MDI for short); the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate (TDI for short), diphenylmethane-4,4- ， - and 2, 4 ， diisocyanate (MDI for short); amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile;

[0018] In the content of the present invention: the aliphatic polyurethane acrylate includes 7402, 72021E, and 7901B produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd., and the epoxy acrylate crosslinker includes QE121KB produced and provided by Shanghai Lishang New Materials; the aliphatic polyurethane acrylate crosslinker and the epoxy acrylate crosslinker greatly enhance the flexibility and elongation of the glue, while enhancing the cohesive force of the glue and increasing the retention of the glue;

[0019] In the content of the present invention: the defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether (produced by Kangdis Chemical, etc.), polyoxyethylene polyoxypropanolamine ether (produced by Changxing Chemical, etc.), polyoxypropylene polyoxyethylene glycerol ether (produced by Haian Petrochemical, etc.) or a mixture of two or more thereof;

[0020] In the content of the present invention: the solvent is any one or a mixture of two or more of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol;

[0021] In the content of the present invention: the epoxy resin is preferably bisphenol A epoxy resin (model BE188EL, produced by Changchun Chemical Co., Ltd., etc.) or epoxy resin E0412 (produced by Shenzhen Yoshida Chemical Co., Ltd., etc.).

[0022] In the content of the present invention: the product production and providing enterprise and model of the water-based polyester primer can be: Huyou Chemical RZ-570, Huyou Chemical Z-3310, Huyou Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, Toyobo MD1200, one or a mixture of more than two.

[0023] Another aspect of the present invention is: a method for preparing a patch tape, characterized in that it comprises the following steps:

[0024] a. Preparation of epoxy modified acrylic adhesive:

[0025] (a-1) The components are 30-40% of improved acrylic pressure-sensitive adhesive, 30-50% of epoxy resin, 0.5-3.6% of curing agent, 0.3-4% of defoaming agent, 15-25% of solvent, and 0.5-2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent in terms of mass percentage, and the total of each component is 100%. Take the raw materials of each component and set aside;

[0026] (a-2) adding the improved acrylic pressure-sensitive adhesive and epoxy resin (slowly) into the solvent and stirring and mixing them uniformly at a stirring speed of 400 rpm to 800 rpm for 20 min to 40 min to obtain a mixed system A;

[0027] (a-3) adding a curing agent, aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing uniformly at a stirring speed of 500 rpm to 800 rpm for 30 min to 60 min to obtain a mixed system B;

[0028] (a-4) adding the defoaming agent (slowly) into the mixed system B and stirring to mix evenly at a stirring speed of 300 rpm to 600 rpm, stirring to eliminate bubbles, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0029] b. Applying the pre-coating agent (using a micro-concave roller) to one side (i.e., one surface) of the substrate layer (3) and drying the pre-coating agent at a temperature of 60 to 120° C. for 1 to 3 minutes, with corona discharge being turned on during the coating process at a corona power of 0.8 kW to 1.8 kW, and winding the pre-coating agent to obtain the substrate layer (3) having the pre-coating layer (2) for standby use;

[0030] The pre-coating agent is a water-based polyester primer, and the substrate layer (3) is a PET film;

[0031] c. unwinding the release film substrate, coating the release liquid, and drying after coating, wherein the drying temperature is 80 to 160° C. and the drying time is 1 to 3 min; during the coating process, corona discharge is turned on, and after drying, a release film substrate layer (6) having a release film layer (5) is obtained and set aside;

[0032] The release film substrate is glassine paper, and the release liquid is silicone release liquid (produced and provided by Dow Chemical, etc.);

[0033] d. unwinding the substrate layer (3) with the pre-coating layer (2) obtained in step b in reverse, coating it with the epoxy-modified acrylic adhesive solution obtained in step a (a-4) (using a comma scraper), drying it at a temperature of 60° C. to 120° C., for 1 to 3 minutes, and in an oven length of 32 m. After drying, laminating it with the surface of the release film layer (5) in the release film substrate layer (6) with the release film layer (5) obtained in step c to obtain an adhesive tape;

[0034] e. Curing the adhesive tape obtained in step d (placed in a curing room) at a curing temperature of 39-41° C. for 3 days to obtain a patch tape.

[0035] In another aspect of the present invention, the surface of the pre-coat layer (2) of the adhesive tape obtained in step d can be further printed with ink of a specific shape (for example, round, square, irregular, the irregular shape is determined according to the opening of the vehicle body), and then cured at a curing temperature of 39-41° C. for 3 days, and the patch tape is obtained after curing.

[0036] In another aspect of the present invention: the hard monomers include acrylic acid (AA for short), methyl methacrylate (MMA for short), hydroxyethyl acrylate (HEA for short), etc.; the soft monomers include ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), isobornyl methacrylate (IBOMA for short), etc.; the methacrylates include lauryl methacrylate, octadecyl methacrylate, etc.; two or more monomers are selected according to the glass transition temperature Tg value to design the hardness and softness of the glue, and the methacrylate with good water resistance is added at the same time;

[0037] In another aspect of the present invention: the curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate (IPDI for short), hexamethylene diisocyanate (HDI for short), and dicyclohexylmethane diisocyanate (H12MDI for short); the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate (TDI for short), diphenylmethane-4,4- ， - and 2, 4 ， diisocyanate (MDI for short); amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile;

[0038] In another aspect of the present invention: the aliphatic polyurethane acrylate includes 7402, 72021E, and 7901B produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd., and the epoxy acrylate crosslinker includes QE121KB produced and provided by Shanghai Lishang New Materials; the aliphatic polyurethane acrylate crosslinker and the epoxy acrylate crosslinker greatly enhance the flexibility and elongation of the glue, while enhancing the cohesion of the glue and increasing the retention of the glue;

[0039] In another aspect of the present invention: the defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether (produced by Kangdis Chemical, etc.), polyoxyethylene polyoxypropanolamine ether (produced by Changxing Chemical, etc.), polyoxypropylene polyoxyethylene glycerol ether (produced by Haian Petrochemical, etc.) or a mixture of two or more thereof;

[0040] In another aspect of the present invention: the solvent is any one or a mixture of two or more of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol;

[0041] In another aspect of the present invention: the epoxy resin is preferably bisphenol A epoxy resin (model BE188EL, produced by Changchun Chemical Co., Ltd., etc.) or epoxy resin E0412 (produced by Shenzhen Yoshida Chemical Co., Ltd., etc.).

[0042] In another aspect of the present invention: the product production and providing enterprise and model of the water-based polyester primer can be: Huyou Chemical RZ-570, Huyou Chemical Z-3310, Huyou Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, Toyobo MD1200, one or a mixture of more than two.

[0043] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0044] (1) In the patch tape of the present invention, a cheap PET base film and a suitable epoxy-modified acrylic adhesive are used to seal the holes of parts in automobile manufacturing. Compared with the plastic and rubber plugs in the prior art, the weight of each vehicle can be reduced by up to about 90% in terms of sealing materials, and the present invention has the advantages of no pollution, no residual adhesive, and no damage to the vehicle. The epoxy-modified acrylic adhesive is used, which is simple to prepare and has no residual adhesive while meeting the requirements. A pre-coating layer is provided to increase the bonding force between the ink and the substrate, and at the same time, the ink printing is fuller and the affinity is increased, which makes up for the problem that the adhesion between the ink and the substrate is weak and the expected effect (ink absorption and wettability of ink printing) cannot be achieved. The ink plays a role in positioning the subsequent die-cutting of the patch tape. At the same time, the adhesive is improved, so that the prepared patch tape has the characteristics of stable viscosity, good corrosion resistance, and excellent water resistance.

[0045] (2) The patch tape of the present invention has the advantages of stable viscosity, good corrosion resistance, water resistance and chemical reagent resistance, and no residual glue and small molecules are precipitated, and the surface of the object to be attached is not polluted. It plays a great protective role on the object to be attached during the process. At the same time, according to the glass transition temperature Tg value of the components, the soft and hard glue are reasonably matched, and the cohesive force is enhanced, so that the overall performance is effectively improved; it also solves the problem of automobile weight caused by the use of plastic and rubber materials to seal the holes in the prior art. The patch tape of the present invention can reduce the weight of the automobile structure to a certain extent, making the automobile lightweight and thus increasing efficiency;

[0046] (3) The product of the present invention has a simple preparation process, simple procedures, easy operation and strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the main cross-sectional structure of the patch tape in the present invention and the embodiments;

[0048] In the figure: 1-ink layer, 2-precoating layer, 3-substrate layer, 4-adhesive layer, 5-release film layer, 6-release film substrate layer (glassine paper). DETAILED DESCRIPTION

[0049] The following embodiments are intended to further illustrate the present invention, but should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0050] Example 1: See attached Figure 1 :

[0051] A method for preparing a patch tape, the steps are as follows:

[0052] a. Preparation of epoxy modified acrylic adhesive:

[0053] (a-1) taking the raw materials of various components according to the mass percentage and composition: 30% of improved acrylic pressure-sensitive adhesive, 46% of epoxy resin, 1.5% of curing agent, 1.5% of defoaming agent, 20% of solvent, and 0.8% of aliphatic polyurethane acrylate and 0.2% of epoxy acrylate crosslinking agent;

[0054] The improved acrylic pressure-sensitive adhesive is composed of ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), acrylic acid (AA for short), methyl methacrylate (MMA for short), and lauryl methacrylate in a mass ratio of 3:2:2:2:0.5:0.5.

[0055] The epoxy resin is bisphenol A epoxy resin;

[0056] The curing agent is isocyanate EC-85 (TDI for short);

[0057] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0058] The solvent is a mixture of ethyl acetate and toluene in a mass ratio of 1:1;

[0059] The aliphatic polyurethane acrylate is 7402 produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.;

[0060] The epoxy acrylate crosslinking agent is QE121KB provided by Shanghai Lishang New Materials Co., Ltd.

[0061] (a-2) slowly adding the improved acrylic pressure-sensitive adhesive and epoxy resin into the solvent and stirring and mixing them uniformly at a stirring speed of 600 rpm for 30 min to obtain a mixed system A;

[0062] (a-3) adding a curing agent, aliphatic polyurethane acrylate and epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing them uniformly at a stirring speed of 700 rpm for 40 minutes to obtain a mixed system B;

[0063] (a-4) slowly adding the defoaming agent into the mixed system B and stirring to mix evenly at a stirring speed of 400 rpm, stirring to eliminate bubbles, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0064] b. The pre-coating agent is applied to one side (i.e., one side) of the substrate layer 3 by a micro-concave roller and dried. The drying temperatures are 60° C., 80° C., 110° C., 120° C., 100° C., 80° C., and the time is 2 min. The corona is turned on during the coating process. The corona power is 1.6 kw. The substrate layer 3 with the pre-coating layer 2 is rolled up and prepared for standby use.

[0065] The pre-coating agent is a water-based polyester primer, specifically RZ-570 from Huwu Chemical; the substrate layer 3 is a PET film, GM13C produced by Jiangsu Dongcai New Materials Co., Ltd., with a thickness of 50 μm;

[0066] c. Unwind the release film substrate, apply the release liquid, and dry after coating. The drying temperatures are 80° C., 120° C., 140° C., 160° C., 140° C., 100° C., and the time is 2 min. During the coating process, corona discharge is turned on. After drying, a release film substrate layer 6 with a release film layer 5 is obtained for standby use.

[0067] The release film substrate is glassine paper, and the release liquid is silicone release liquid (produced and provided by Dow Chemical);

[0068] d. Reversely unwind the substrate layer 3 with the pre-coating layer 2 obtained in step b, apply the epoxy-modified acrylic adhesive obtained in step a (a-4) with a comma blade, and dry it. The drying temperatures are 60° C., 80° C., 90° C., 110° C., 120° C., 120° C., 100° C., and 80° C. in sequence. There are 8 ovens in total. The drying time is 2 min and the oven length is 32 m. After drying, the surface of the release film layer 5 in the release film substrate layer 6 with the release film layer 5 obtained in step c is laminated to obtain a 20 μm-25 μm thick adhesive tape.

[0069] e. Printing ink of a specific shape (which may be round, square, or irregular, and the irregular shape is determined according to the opening of the vehicle body) on the surface of the pre-coat layer 2 of the adhesive tape obtained in step d,

[0070] f. Place the tape printed with ink in step e in a curing room for curing at a temperature of 40° C. for 3 days to obtain a patch tape.

[0071] Example 2: See attached Figure 1 :

[0072] A method for preparing a patch tape, the steps are as follows:

[0073] a. Preparation of epoxy modified acrylic adhesive:

[0074] (a-1) taking the raw materials of the components according to mass percentage and composition, namely, 40% of improved acrylic pressure-sensitive adhesive, 30% of epoxy resin, 2.5% of curing agent, 2% of defoaming agent, 23.5% of solvent, 1.5% of aliphatic polyurethane acrylate and 0.5% of epoxy acrylate crosslinking agent, and setting aside;

[0075] The improved acrylic pressure-sensitive adhesive resin is a mixture of ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), acrylic acid (AA for short), methyl methacrylate (MMA for short), and octadecyl methacrylate in a mass ratio of 2:3:1:2:1.6:0.4;

[0076] The epoxy resin is bisphenol A epoxy resin;

[0077] The curing agent is isocyanate EC-97 (MDI for short);

[0078] The defoamer is polyoxypropylene polyoxyethylene glycerol ether;

[0079] The solvent is a mixture of ethyl acetate and petroleum ether in a mass ratio of 2:1;

[0080] The aliphatic polyurethane acrylate is 7402 produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.;

[0081] The epoxy acrylate crosslinking agent is QE121KB provided by Shanghai Lishang New Materials Co., Ltd.

[0082] The pre-coating agent in step b is specifically Huajinsi 5134;

[0083] The rest is the same as in Example 1 and is omitted.

[0084] Example 3: See attached Figure 1 :

[0085] A method for preparing a patch tape, the steps are as follows:

[0086] a. Preparation of epoxy modified acrylic adhesive:

[0087] (a-1) taking the raw materials of the components according to mass percentage and composition, namely, 40% of improved acrylic pressure-sensitive adhesive, 30% of epoxy resin, 2.5% of curing agent, 3.5% of defoaming agent, 22.5% of solvent, 1% of aliphatic polyurethane acrylate and 0.5% of epoxy acrylate crosslinking agent, and setting aside;

[0088] The improved acrylic pressure-sensitive adhesive resin is a mixture of ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), acrylic acid (AA for short), methyl methacrylate (MMA for short), and lauryl methacrylate in a mass ratio of 2:2:2:2:1.9:0.1;

[0089] The epoxy resin is epoxy resin E0412;

[0090] The curing agent is isocyanate L-75 (abbreviated as H12MDI);

[0091] The defoamer is polyoxyethylene polyoxypropanolamine ether;

[0092] The solvent is a mixture of ethyl acetate and xylene in a mass ratio of 2:1;

[0093] The aliphatic polyurethane acrylate is 7402 produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.;

[0094] The epoxy acrylate crosslinking agent is QE121KB provided by Shanghai Lishang New Materials Co., Ltd.

[0095] The pre-coating agent in step b is specifically Zongjia New Material WPE-600;

[0096] The rest is the same as in Example 1 and is omitted.

[0097] Example 4: See attached Figure 1 :

[0098] A method for preparing a patch tape, the steps are as follows:

[0099] a. Preparation of epoxy modified acrylic adhesive:

[0100] (a-1) taking the raw materials of the components according to mass percentage and composition, namely, 30% of improved acrylic pressure-sensitive adhesive, 50% of epoxy resin, 1.5% of curing agent, 1% of defoaming agent, 16.8% of solvent, 0.5% of aliphatic polyurethane acrylate and 0.2% of epoxy acrylate crosslinking agent, and setting aside;

[0101] The improved acrylic pressure-sensitive adhesive resin is a mixture of ethyl acrylate (EA), butyl acrylate (BA), isooctyl acrylate (2-EHA), acrylic acid (AA), methyl methacrylate (MMA), and octadecyl methacrylate in a mass ratio of 3:3:2:1:0.5:0.5;

[0102] The epoxy resin is epoxy resin E0412;

[0103] The curing agent is isocyanate 2300A (IPDI for short);

[0104] The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether;

[0105] The solvent is a mixture of ethyl acetate and toluene in a mass ratio of 2:1;

[0106] The aliphatic polyurethane acrylate is 7402 produced and provided by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.;

[0107] The epoxy acrylate crosslinking agent is QE121KB provided by Shanghai Lishang New Materials Co., Ltd.

[0108] (a-2) slowly adding the improved acrylic pressure-sensitive adhesive and epoxy resin into the solvent and stirring and mixing them uniformly at a stirring speed of 600 rpm for 30 min to obtain a mixed system A;

[0109] (a-3) adding a curing agent, aliphatic polyurethane acrylate and epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing them uniformly at a stirring speed of 800 rpm for 40 minutes to obtain a mixed system B;

[0110] (a-4) slowly adding the defoaming agent into the mixed system B and stirring to mix evenly at a stirring speed of 500 rpm, stirring to eliminate bubbles, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0111] b. The pre-coating agent is applied to one side (i.e., one side) of the substrate layer 3 by a micro-concave roller and dried. The drying temperatures are 60° C., 80° C., 110° C., 120° C., 100° C., 80° C., and the time is 2 min. The corona is turned on during the coating process. The corona power is 1.8 kW. The substrate layer 3 with the pre-coating layer 2 is rolled up and prepared for standby use.

[0112] The pre-coating agent is a water-based polyester primer, specifically RZ-570 from Huwu Chemical; the substrate layer 3 is a PET film;

[0113] c. Unwind the release film substrate, apply the release liquid, and dry it after coating. The drying temperatures are 80° C., 120° C., 140° C., 160° C., 140° C., 100° C., and the time is 2 min. During the coating process, corona is turned on with a corona power of 1.8 kW. After drying, a release film substrate layer 6 with a release film layer 5 is obtained for standby use.

[0114] The release film substrate is glassine paper, and the release liquid is silicone release liquid (produced and provided by Dow Chemical);

[0115] d. Reversely unwind the substrate layer 3 with the pre-coating layer 2 obtained in step b, apply the epoxy-modified acrylic adhesive obtained in step a (a-4) with a comma blade, and dry it. The drying temperatures are 60° C., 80° C., 90° C., 110° C., 120° C., 120° C., 100° C., and 80° C. in sequence, with a total of 8 ovens for 2 min. After drying, laminate the surface of the release film layer 5 in the release film substrate layer 6 with the release film layer 5 obtained in step c to obtain a 20 μm-25 μm thick adhesive tape;

[0116] e. Printing ink of a specific shape (which may be round, square, or irregular, and the irregular shape is determined according to the opening of the vehicle body) on the surface of the pre-coat layer 2 of the adhesive tape obtained in step d,

[0117] f. Place the tape printed with ink in step e in a curing room for curing at a temperature of 40° C. for 3 days to obtain a patch tape.

[0118] Example 5: See attached Figure 1 :

[0119] A method for preparing a patch tape, the steps are as follows:

[0120] a. Preparation of epoxy modified acrylic adhesive:

[0121] (a-1) taking the raw materials of the components according to mass percentage and composition, namely, 30% of improved acrylic pressure-sensitive adhesive, 50% of epoxy resin, 1.5% of curing agent, 1% of defoaming agent, 16.8% of solvent, 0.5% of aliphatic polyurethane acrylate and 0.2% of epoxy acrylate crosslinking agent, and setting aside;

[0122] The improved acrylic pressure-sensitive adhesive is a mixture of ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), acrylic acid (AA for short), methyl methacrylate (MMA for short), and octadecyl methacrylate in a mass ratio of 1:1:1:4:2.8:0.2;

[0123] The rest are the same as in Example 4 and are omitted.

[0124] Comparative Example 1:

[0125] A method for preparing a patch tape comprises the following steps:

[0126] S1. Preparation of adhesive

[0127] S11, adhesive acrylic adhesive, according to mass percentage, is composed of 60% acrylic pressure-sensitive adhesive resin, 1% curing agent, 1% defoaming agent, 38% solvent, etc.

[0128] The acrylic pressure-sensitive adhesive resin is a mixture of ethyl acrylate (EA), isooctyl acrylate (2-EHA), methyl methacrylate (MMA), and octadecyl acrylate in a ratio of 4:3:2:1.

[0129] The ethyl acrylate (EA) and isooctyl acrylate (2-EHA) are soft monomers, and methyl methacrylate (MMA) is a hard monomer; the curing agent is isocyanate EC-85; the pre-coating agent is Huwu Chemical RZ-570; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; and the solvent is ethyl acetate;

[0130] S12, slowly adding the solvent to the improved acrylic pressure-sensitive adhesive resin and stirring thoroughly at a stirring speed of 600 rpm for 30 min to obtain a mixed system A;

[0131] S13, slowly adding the curing agent into the mixed system A, and stirring for 40 min at a stirring speed of 800 rpm to fully mix the solution to obtain a mixed system B;

[0132] S14, slowly adding the defoamer into the mixed system B at a stirring speed of 500 rpm, stirring to eliminate bubbles, and obtaining the adhesive liquid for standby use; (the adhesive liquid is the "adhesive liquid C" in S4)

[0133] S2, the pre-coating agent is applied to one side of the substrate layer by a micro-concave roller and dried at a temperature of 60°C, 80°C, 110°C, 120°C, 100°C, and 80°C. The coating process is carried out with corona for 2 minutes and a corona power of 1.8 kW. After coating, the pre-coating layer is rolled up to prepare a pre-coating layer for standby use;

[0134] S3, unwinding the glassine paper substrate, coating it with an organic silicone release liquid, produced by Dow Chemical, etc., drying after coating, at temperatures of 80° C., 120° C., 140° C., 160° C., 140° C., and 100° C., for 2 min; during the coating process, corona discharge was turned on, with a corona power of 1.8 kw, to prepare a release layer, and a release film was obtained for standby use;

[0135] S4, unwind the pre-coated film prepared in S2 in reverse, apply glue C with a comma scraper, and adhere to the release film surface in S3 after drying, and dry in an 8-section oven at 60°C, 80°C, 90°C, 110°C, 120°C, 120°C, 100°C, and 80°C to form a 20μm-25μm thick glue film to obtain a patch tape;

[0136] S5, unwinding the adhesive tape prepared in step S4 in reverse, and printing ink of a specific shape, such as a circle, a square, or an irregular shape, on the pre-coated surface.

[0137] S6. Curing the patch tape prepared in S5 at 40° C. for 3 days to obtain a final product.

[0138] Comparative Example 2:

[0139] A method for preparing a patch tape, which differs from comparative example 1 in that the proportions of the components are changed, wherein the adhesive liquid acrylic adhesive liquid is composed of a mixture of 50% acrylic pressure-sensitive adhesive resin, 1% curing agent, 1% defoaming agent, 48% solvent, etc., according to mass percentage.

[0140] The acrylic pressure-sensitive adhesive resin is a mixture of ethyl acrylate (EA), isooctyl acrylate (2-EHA), methyl methacrylate (MMA), and octadecyl acrylate in a ratio of 3:2:3:2.

[0141] The patch tapes prepared in Examples 1-5 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1.

[0142] Table 1:

[0143]

[0144] Note: Adhesion test standard is GB / T 2792-2014, initial adhesion test standard is GB / T 4852-2014, holding power (maintaining adhesion) test standard is GB / T 4851-2014; chemical solvent resistance is to stick the sample 25mm*120mm on the painted steel plate, and then soak it in wax remover, glass cleaner, engine oil, brake fluid for 3 days respectively, check the surface changes and check whether there are any abnormalities at the sticking place; the coating appearance is visually inspected.

[0145] It can be seen from the test results in Table 1 that a reasonable combination of soft and hard monomers can better increase the product retention, make the glue cohesion better, and meet production needs. In addition, the present invention designs the patch tape structure and the soft and hard components of the adhesive layer, and further uses a pre-coating layer, so that the prepared patch tape has better ink absorption, higher cohesion, and more affinity, making the ink easy to identify and select different patterns for easy use.

[0146] Example 6: See attached Figure 1 :

[0147] A patch tape, the patch tape comprises a pre-coating layer 2, a substrate layer 3, an adhesive layer 4, a release film layer 5 and a release film substrate layer 6 which are sequentially stacked and composed;

[0148] The pre-coating layer 2 is a pre-coating agent layer after drying, and the pre-coating agent is a water-based polyester primer;

[0149] The adhesive layer 4 is a layer of epoxy-modified acrylic adhesive after drying; the epoxy-modified acrylic adhesive is composed of 35% of improved acrylic pressure-sensitive adhesive, 40% of epoxy resin, 2% of curing agent, 2.1% of defoaming agent, 19.7% of solvent, and 1.2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent;

[0150] The improved acrylic pressure-sensitive adhesive is composed of a mixture of a hard monomer, a soft monomer and methacrylate;

[0151] The substrate layer 3 is a PET film;

[0152] The release film layer 5 is a release liquid layer after drying; the release liquid is an organic silicone release liquid, and the product is produced and provided by Dow Chemical;

[0153] The release film substrate layer 6 is a release film substrate and is glassine paper.

[0154] Example 7: See attached Figure 1 :

[0155] A patch tape, the patch tape comprises a pre-coating layer 2, a substrate layer 3, an adhesive layer 4, a release film layer 5 and a release film substrate layer 6 which are sequentially stacked and composed;

[0156] The adhesive layer 4 is a dried epoxy-modified acrylic adhesive layer; the epoxy-modified acrylic adhesive is composed of 30% of improved acrylic pressure-sensitive adhesive, 50% of epoxy resin, 0.5% of curing agent, 0.3% of defoaming agent, 18.7% of solvent, and 0.5% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent;

[0157] The rest is the same as in Example 6 and is omitted.

[0158] Example 8: See attached Figure 1 :

[0159] A patch tape, the patch tape comprises a pre-coating layer 2, a substrate layer 3, an adhesive layer 4, a release film layer 5 and a release film substrate layer 6 which are sequentially stacked and composed;

[0160] The adhesive layer 4 is a layer of epoxy-modified acrylic adhesive after drying; the epoxy-modified acrylic adhesive is composed of 40% of improved acrylic pressure-sensitive adhesive, 30% of epoxy resin, 3.6% of curing agent, 4% of defoaming agent, 20.4% of solvent, and 2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent in terms of mass percentage and composition;

[0161] The rest is the same as in Example 6 and is omitted.

[0162] In the above-mentioned embodiments 6-8:

[0163] The thickness of the substrate layer 3 can be 50-300 μm, specifically 50 μm, 75 μm, 100 μm, 125 μm, 150 μm, 200 μm, 300 μm, etc.; the production and product model (brand) of the PET film can be: GM3 series film produced and provided by Jiangsu Dongcai New Materials Co., Ltd. or existing commercially available products;

[0164] The glassine paper production companies and product models (brands) are: Daoming Optics G01W80F40, G01W8078-M, Guangzhou Naiheng A1180ER, A1180BM, A1180AH, and Shanghai Baoyan 12A04C-BX, etc.

[0165] The hard monomers include acrylic acid (AA for short), methyl methacrylate (MMA for short), hydroxyethyl acrylate (HEA for short), etc.; the soft monomers include ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), isobornyl methacrylate (IBOMA for short), etc.; the methacrylates include lauryl methacrylate, octadecyl methacrylate, etc.; two or more monomers are selected according to the glass transition temperature Tg value to design the hardness and softness of the glue, and the methacrylate with good water resistance is added at the same time;

[0166] The curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate (IPDI for short), hexamethylene diisocyanate (HDI for short), and dicyclohexylmethane diisocyanate (H12MDI for short); the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate (TDI for short), diphenylmethane-4,4- ， - and 2, 4 ， diisocyanate (MDI for short); amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile;

[0167] The aliphatic polyurethane acrylate includes 7402, 72021E, and 7901B produced by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd., and the epoxy acrylate crosslinking agent includes QE121KB produced by Shanghai Lishang New Materials Co., Ltd.

[0168] The defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether (produced by Kangdis Chemical, etc.), polyoxyethylene polyoxypropanolamine ether (produced by Changxing Chemical, etc.), and polyoxypropylene polyoxyethylene glycerol ether (produced by Hai'an Petrochemical, etc.) or a mixture of two or more thereof;

[0169] The solvent is any one of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol, or a mixture of two or more thereof;

[0170] The epoxy resin is bisphenol A epoxy resin (model BE188EL, produced by Changchun Chemical Co., Ltd., etc.) or epoxy resin E0412 (produced by Shenzhen Yoshida Chemical Co., Ltd., etc.);

[0171] The water-based polyester primer product production and providing enterprise and model can be: Huyu Chemical RZ-570, Huyu Chemical Z-3310, Huyu Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, Toyobo MD1200, one or a mixture of two or more thereof.

[0172] Example 9: See attached Figure 1 :

[0173] A patch tape, which is composed of an ink layer 1, a pre-coating layer 2, a substrate layer 3, an adhesive layer 4, a release film layer 5 and a release film substrate layer 6 which are stacked in sequence; the ink layer 1 is coated on the surface of the pre-coating layer 2, and the ink layer 1 can be a circular, square, irregular or other shaped pattern.

[0174] The rest are the same as any one of Embodiments 6-8 and are omitted.

[0175] Example 10: See attached Figure 1 :

[0176] A method for preparing a patch tape comprises the following steps:

[0177] a. Preparation of epoxy modified acrylic adhesive:

[0178] (a-1) taking the raw materials of the components according to the mass percentage and composition of 35% improved acrylic pressure-sensitive adhesive, 40% epoxy resin, 2% curing agent, 2.1% defoaming agent, 19.7% solvent, and 1.2% aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent and setting aside;

[0179] (a-2) adding the improved acrylic pressure-sensitive adhesive and epoxy resin (slowly) into the solvent and stirring and mixing them uniformly at a stirring speed of 600 rpm for 30 min to obtain a mixed system A;

[0180] (a-3) adding a curing agent, aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing uniformly at a stirring speed of 650 rpm for 45 min to obtain a mixed system B;

[0181] (a-4) adding the defoamer (slowly) into the mixed system B and stirring to mix evenly at a stirring speed of 450 rpm until bubbles are eliminated, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0182] b. Apply the pre-coating agent (using a micro-concave roller) to one side (i.e., one side) of the substrate layer 3 and dry it at a temperature of 120° C. for 1 min. During the coating process, corona is applied at a power of 1.3 kW. The substrate layer 3 with the pre-coating layer 2 is rolled up to obtain a substrate layer 3 for standby use.

[0183] The pre-coating agent is a water-based polyester primer, and the substrate layer 3 is a PET film;

[0184] c. Unwind the release film substrate, apply the release liquid, and dry it after coating. The drying temperature is 160° C. and the time is 1 min. During the coating process, corona discharge is turned on. After drying, a release film substrate layer 6 with a release film layer 5 is obtained for standby use.

[0185] The release film substrate is glassine paper, and the release liquid is silicone release liquid (produced and provided by Dow Chemical);

[0186] d. unwind the substrate layer 3 with the pre-coating layer 2 obtained in step b in reverse, apply the epoxy-modified acrylic adhesive solution obtained in step a (a-4) (using a comma scraper), dry at 120° C. for 1 min, and after drying, laminate the surface of the release film layer 5 in the release film substrate layer 6 with the release film layer 5 obtained in step c to obtain an adhesive tape;

[0187] e. Curing the adhesive tape obtained in step d (placed in a curing room) at a curing temperature of 41° C. for 3 days to obtain a patch tape.

[0188] Example 11: See attached Figure 1 :

[0189] A method for preparing a patch tape comprises the following steps:

[0190] a. Preparation of epoxy modified acrylic adhesive:

[0191] (a-1) taking the raw materials of the components according to mass percentage and composition, namely, 30% of improved acrylic pressure-sensitive adhesive, 50% of epoxy resin, 0.5% of curing agent, 0.3% of defoaming agent, 18.7% of solvent, and 0.5% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent, and setting aside;

[0192] (a-2) adding the improved acrylic pressure-sensitive adhesive and epoxy resin (slowly) into the solvent and stirring and mixing them uniformly at a stirring speed of 400 rpm for 40 minutes to obtain a mixed system A;

[0193] (a-3) adding a curing agent, aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing uniformly at a stirring speed of 500 rpm for 60 min to obtain a mixed system B;

[0194] (a-4) adding the defoamer (slowly) into the mixed system B and stirring to mix evenly at a stirring speed of 300 rpm until bubbles are eliminated, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0195] b. Apply the pre-coating agent (using a micro-concave roller) to one side (i.e., one side) of the substrate layer 3 and dry it at a temperature of 100° C. for 3 min. During the coating process, corona discharge is turned on with a corona power of 1.8 kW. The substrate layer 3 with the pre-coating layer 2 is rolled up and prepared for standby use.

[0196] The pre-coating agent is a water-based polyester primer, and the substrate layer 3 is a PET film;

[0197] c. Unwind the release film substrate, apply the release liquid, and dry after coating. The drying temperature is 110° C. and the time is 3 min. The corona is turned on during the coating process. After drying, a release film substrate layer 6 with a release film layer 5 is obtained for standby use.

[0198] The release film substrate is glassine paper, and the release liquid is silicone release liquid;

[0199] d. unwind the substrate layer 3 with the pre-coating layer 2 obtained in step b in reverse, apply the epoxy-modified acrylic adhesive solution obtained in step a (a-4) (using a comma scraper), dry at a temperature of 100° C. for 3 min, and after drying, adhere the surface of the release film layer 5 in the release film substrate layer 6 with the release film layer 5 obtained in step c to obtain an adhesive tape;

[0200] e. Curing the adhesive tape obtained in step d (placed in a curing room) at a curing temperature of 39° C. for 3 days to obtain a patch tape.

[0201] Example 12: See attached Figure 1 :

[0202] A method for preparing a patch tape comprises the following steps:

[0203] a. Preparation of epoxy modified acrylic adhesive:

[0204] (a-1) taking the raw materials of the components according to mass percentage and composition: 40% of improved acrylic pressure-sensitive adhesive, 30% of epoxy resin, 3.6% of curing agent, 4% of defoaming agent, 20.4% of solvent, and 2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent, and setting aside;

[0205] (a-2) adding the improved acrylic pressure-sensitive adhesive and epoxy resin (slowly) into the solvent and stirring and mixing them uniformly at a stirring speed of 800 rpm for 20 min to obtain a mixed system A;

[0206] (a-3) adding a curing agent, aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing uniformly at a stirring speed of 800 rpm for 30 min to obtain a mixed system B;

[0207] (a-4) adding the defoaming agent (slowly) into the mixed system B and stirring to mix evenly at a stirring speed of 600 rpm until bubbles are eliminated, thereby obtaining an epoxy-modified acrylic adhesive solution;

[0208] b. Apply the pre-coating agent (using a micro-concave roller) to one side (i.e., one side) of the substrate layer 3 and dry it at a temperature of 120° C. for 1 min. During the coating process, corona is applied at a power of 0.8 kW. The substrate layer 3 with the pre-coating layer 2 is rolled up and prepared for standby use.

[0209] The pre-coating agent is a water-based polyester primer, and the substrate layer 3 is a PET film;

[0210] c. Unwind the release film substrate, apply the release liquid, and dry it after coating. The drying temperature is 160° C. and the time is 1 min. During the coating process, corona discharge is turned on. After drying, a release film substrate layer 6 with a release film layer 5 is obtained for standby use.

[0211] The release film substrate is glassine paper, and the release liquid is silicone release liquid;

[0212] d. unwind the substrate layer 3 with the pre-coating layer 2 obtained in step b in reverse, apply the epoxy-modified acrylic adhesive solution obtained in step a (a-4) (using a comma scraper), dry at 120° C. for 1 min, and after drying, laminate the surface of the release film layer 5 in the release film substrate layer 6 with the release film layer 5 obtained in step c to obtain an adhesive tape;

[0213] e. Curing the adhesive tape obtained in step d (placed in a curing room) at a curing temperature of 40° C. for 3 days to obtain a patch tape.

[0214] Example 13: See attached Figure 1 :

[0215] A method for preparing a patch tape, comprising printing ink of a specific shape (for example, round, square, irregular, the irregular shape being determined according to the opening of a vehicle body) on the surface of the pre-coat layer 2 of the tape obtained in step d, and then aging the pre-coat layer 2 at a temperature of 39 to 41° C. for 3 days to obtain the patch tape;

[0216] The rest are the same as any one of Examples 10-12 and are omitted.

[0217] In the above-mentioned embodiments 10-13:

[0218] The hard monomers include acrylic acid (AA for short), methyl methacrylate (MMA for short), hydroxyethyl acrylate (HEA for short), etc.; the soft monomers include ethyl acrylate (EA for short), butyl acrylate (BA for short), isooctyl acrylate (2-EHA for short), isobornyl methacrylate (IBOMA for short), etc.; the methacrylates include lauryl methacrylate, octadecyl methacrylate, etc.; two or more monomers are selected according to the glass transition temperature Tg value to design the hardness and softness of the glue, and the methacrylate with good water resistance is added at the same time;

[0219] The curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate (IPDI for short), hexamethylene diisocyanate (HDI for short), and dicyclohexylmethane diisocyanate (H12MDI for short); the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate (TDI for short), diphenylmethane-4,4- ， - and 2, 4 ， diisocyanate (MDI for short); amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile;

[0220] The aliphatic polyurethane acrylate includes 7402, 72021E, and 7901B produced by Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd., and the epoxy acrylate crosslinker includes QE121KB produced by Shanghai Lishang New Materials. The aliphatic polyurethane acrylate crosslinker and the epoxy acrylate crosslinker greatly enhance the flexibility and elongation of the glue, while enhancing the cohesion of the glue and increasing the retention of the glue.

[0221] The defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether (produced by Kangdis Chemical, etc.), polyoxyethylene polyoxypropanolamine ether (produced by Changxing Chemical, etc.), and polyoxypropylene polyoxyethylene glycerol ether (produced by Hai'an Petrochemical, etc.) or a mixture of two or more thereof;

[0222] The solvent is any one of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol, or a mixture of two or more thereof;

[0223] The epoxy resin is preferably bisphenol A epoxy resin (model BE188EL, produced by Changchun Chemical Co., Ltd., etc.) or epoxy resin E0412 (produced by Shenzhen Yoshida Chemical Co., Ltd., etc.);

[0224] The product production and providing enterprise and model of the water-based polyester primer can be: Huwu Chemical RZ-570, Huwu Chemical Z-3310, Huwu Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, Toyobo MD1200, one or a mixture of two or more thereof;

[0225] The thickness of the substrate layer 3 can be 50-300 μm, specifically 50 μm, 75 μm, 100 μm, 125 μm, 150 μm, 200 μm, 300 μm, etc.; the production and product model (brand) of the PET film can be: GM3 series film produced and provided by Jiangsu Dongcai New Materials Co., Ltd. or existing commercially available products;

[0226] The glassine paper production and supplying enterprises and product models (brands) are: Daoming Optics G01W80F40, G01W8078-M, Guangzhou Naiheng A1180ER, A1180BM, A1180AH, and Shanghai Baoyan 12A04C-BX, etc.

[0227] In the above embodiments: the percentages used, unless otherwise specified, are all mass (weight) percentages or percentages known to those skilled in the art; the proportions used, unless otherwise specified, are all mass (weight) proportions; and the weights may be in grams or kilograms.

[0228] In the above embodiments, the process parameters (temperature, time, speed, etc.) in each step and the numerical values ​​of the amounts of each component are ranges, and any point can be applied.

[0229] The technical contents not specifically described in the present invention and the above embodiments are the same as the prior art, and the raw materials are all commercially available products.

[0230] The present invention is not limited to the above embodiments, and all the contents of the present invention can be implemented and have the above good effects.

Claims

1. A patch tape, characterized in that: The patch tape is mainly composed of a pre-coating layer (2), a substrate layer (3), an adhesive layer (4), a release film layer (5) and a release film substrate layer (6) which are stacked in sequence; The pre-coating layer (2) is a pre-coating agent layer after drying, and the pre-coating agent is a water-based polyester primer; The adhesive layer (4) is a layer of epoxy-modified acrylic adhesive after drying; the epoxy-modified acrylic adhesive is composed of 30-40% of improved acrylic pressure-sensitive adhesive, 30-50% of epoxy resin, 0.5-3.6% of curing agent, 0.3-4% of defoaming agent, 15-25% of solvent, and 0.5-2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent in mass percentage and components, and the total of all components is 100%; The improved acrylic pressure-sensitive adhesive is composed of a mixture of a hard monomer, a soft monomer and methacrylate; The substrate layer (3) is a PET film; The release film layer (5) is a release liquid layer after drying; the release liquid is an organic silicone release liquid; The release film substrate layer (6) is the release film substrate, which is glassine paper.

2. The patch tape according to claim 1, characterized in that: It also comprises an ink layer (1), wherein the ink layer (1) is coated on the surface of the pre-coating layer (2).

3. The patch tape according to claim 1 or 2, characterized in that: The hard monomers include acrylic acid, methyl methacrylate, and hydroxyethyl acrylate; the soft monomers include ethyl acrylate, butyl acrylate, isooctyl acrylate, and isobornyl methacrylate; and the methacrylates include lauryl methacrylate and octadecyl methacrylate.

4. The patch tape according to claim 1 or 2, characterized in that: The curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate, hexamethylene diisocyanate, and dicyclohexylmethane diisocyanate; the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate, diphenylmethane-4,4- ， - and 2, 4 ， diisocyanates; amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile; The defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropanolamine ether, and polyoxypropylene polyoxyethylene glycerol ether, or a mixture of two or more thereof; The solvent is any one of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol, or a mixture of two or more thereof; The epoxy resin is bisphenol A epoxy resin or epoxy resin E0412.

5. The patch tape according to claim 1 or 2, characterized in that: The water-based polyester primer is produced by one or a mixture of two or more of the following companies and models: Huwu Chemical RZ-570, Huwu Chemical Z-3310, Huwu Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, and Toyobo MD1200.

6. A method for preparing a patch tape, characterized in that The following steps are involved: a. Preparation of epoxy modified acrylic adhesive: (a-1) According to the mass percentage and components, 30-40% of improved acrylic pressure-sensitive adhesive, 30-50% of epoxy resin, 0.5-3.6% of curing agent, 0.3-4% of defoaming agent, 15-25% of solvent, and 0.5-2% of aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent, and the total of each component is 100%. Take the raw materials of each component and set aside; (a-2) adding the improved acrylic pressure-sensitive adhesive and epoxy resin into the solvent and stirring and mixing them uniformly to obtain a mixed system A; (a-3) adding a curing agent, aliphatic polyurethane acrylate and / or epoxy acrylate crosslinking agent to the mixed system A and stirring and mixing them uniformly to obtain a mixed system B; (a-4) adding the defoaming agent to the mixed system B and stirring the mixture evenly at a stirring speed of 300 rpm to 600 rpm until bubbles are eliminated, thereby obtaining an epoxy-modified acrylic adhesive solution; b. applying the pre-coating agent to one side of the substrate layer (3) and drying the substrate layer (3) at a temperature of 60 to 120° C. for 1 to 3 minutes, and rolling the substrate layer (3) with the pre-coating layer (2) for later use; The pre-coating agent is a water-based polyester primer, and the substrate layer 3 is a PET film; c. unwinding the release film substrate, coating the release liquid, and drying after coating, wherein the drying temperature is 80 to 160° C. and the drying time is 1 to 3 minutes, and after drying, a release film substrate layer (6) having a release film layer (5) is obtained, which is set aside; The release film substrate is glassine paper, and the release liquid is silicone release liquid; d. unwinding the substrate layer (3) with the pre-coating layer (2) obtained in step b in the reverse direction, coating it with the epoxy-modified acrylic adhesive solution obtained in step a (a-4), drying it at a temperature of 60° C. to 120° C. for 1 to 3 min, and laminating it with the surface of the release film layer (5) in the release film substrate layer (6) with the release film layer (5) obtained in step c after drying to obtain an adhesive tape; e. Curing the adhesive tape obtained in step d at a curing temperature of 39-41° C. for 3 days to obtain a patch tape.

7. The method for preparing the patch tape according to claim 6, characterized in that: The surface of the pre-coat layer (2) of the adhesive tape obtained in step d is printed with ink of a specific shape, and then aged at a temperature of 39 to 41° C. for 3 days. After the ageing, the patch adhesive tape is obtained.

8. The method for preparing the patch tape according to claim 6 or 7, characterized in that: The hard monomers include acrylic acid, methyl methacrylate, and hydroxyethyl acrylate; the soft monomers include ethyl acrylate, butyl acrylate, isooctyl acrylate, and isobornyl methacrylate; and the methacrylates include lauryl methacrylate and octadecyl methacrylate.

9. The method for preparing the patch tape according to claim 6 or 7, characterized in that: The curing agent is any one of an isocyanate crosslinking agent, an amine crosslinking agent, and an aziridine crosslinking agent; the isocyanate crosslinking agent mainly includes two categories: aliphatic isocyanates and aromatic isocyanates. The aliphatic isocyanates include isophorone diisocyanate, hexamethylene diisocyanate, and dicyclohexylmethane diisocyanate; the aromatic isocyanates include 2,4- and 2,6-toluene diisocyanate, diphenylmethane-4,4- ， - and 2, 4 ， diisocyanates; amine crosslinking agents include isooctyl p-dimethylaminobenzoate, triethanolamine, triethylenetetramine; aziridine crosslinking agents include azobisisobutyronitrile; The defoaming agent is any one of polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropanolamine ether, and polyoxypropylene polyoxyethylene glycerol ether, or a mixture of two or more thereof; The solvent is any one of ethyl acetate, toluene, butyl acetate, butanone, petroleum ether, isopropanol, xylene, and n-butanol, or a mixture of two or more thereof; The epoxy resin is preferably bisphenol A epoxy resin or epoxy resin E0412.

10. The method for preparing the patch tape according to claim 6 or 7, characterized in that: The water-based polyester primer is produced by one or a mixture of two or more of the following companies and models: Huwu Chemical RZ-570, Huwu Chemical Z-3310, Huwu Chemical RZ-105, Huajinsi 5134, Zongjia New Materials WPE-600, and Toyobo MD1200.

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