A thermal mount protection carbon tape and a preparation method and application thereof

Abstract

The application discloses a kind of thermal mounting protective carbon tape and its preparation method and application, the thermal mounting protective carbon tape includes the back coating layer, base film layer, release layer and protective layer sequentially superimposed;The thickness of the base film layer is 4-130 μm;The coating thickness of the release layer is 0.5-20 μm;The coating thickness of the protective layer is 0.5-20 μm;The coating thickness of the back coating layer is 0.4-1.2 μm.The thermal mounting protective carbon tape is suitable for thermal mounting process and has high weather resistance and high gloss protective carbon tape, it shows higher luminosity performance after thermal mounting film than before film, and the weather resistance of thermal transfer protective carbon tape is better;The thickness of the thermal mounting protective carbon tape is thicker than the thickness of thermal transfer protective carbon tape, so it can resist the erosion of extremely severe natural environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal transfer protective carbon tape, and particularly relates to a thermal transfer protective carbon tape and a preparation method and application thereof. BACKGROUND

[0002] The most common way to protect the reflective film on the market is to cover the UV protective film, but there are two disadvantages: first, the bubbles generated during the film covering process cannot be eliminated; second, the cost is relatively high. Compared with the above two methods, the method of covering the thermal transfer protective carbon tape on the reflective film through thermal printing has more advantages. However, this method has thickness limitations. The thick consumables cannot be transferred by the heating and pressing of the print head, or the transfer is not complete. At the same time, the thermal transfer protective carbon tape adds too many additives to meet the better weather resistance and scratch resistance, and the glossiness problem after transfer. SUMMARY

[0003] In order to solve the above technical problems, one of the purposes of the present application is to provide a thermal transfer protective carbon tape with good gloss performance and weather resistance after transfer.

[0004] In order to achieve the above purpose, the technical scheme of the present application is as follows: a thermal transfer protective carbon tape, comprising a back coating layer, a base film layer, a release layer and a protective layer arranged in sequence.

[0005] The thickness of the base film layer is 4-130μm (which can be any one of 4μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm and 130μm or a range corresponding to any two values, since the thermal transfer process requires good heat resistance of the base film layer, a thicker base film layer is preferred, preferably, the thickness of the base film layer is 10-50μm);

[0006] The coating thickness of the release layer is 0.5-20μm (which can be any one of 0.5μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm and 10μm or a range corresponding to any two values, preferably, the thickness of the release layer is 1-10μm);

[0007] The coating thickness of the protective layer is 0.5-20 μm (may be any value between 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm and 10 μm or a range corresponding to any two values therebetween, preferably, the thickness of the protective layer is 1-10 μm) ;

[0008] The coating thickness of the back coating layer is 0.4-1.2 μm (may be any value between 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm and 1.2 μm, preferably, the thickness of the back coating layer is 0.4-0.6 μm).

[0009] The base film layer in the above technical solution meets at least one of the following conditions A1-C1:

[0010] A1: The base film layer is a transparent flexible plastic film;

[0011] B1: The material of the base film layer is a polypropylene film, a polyethylene terephthalate film, a polyethylene terephthalate film, a polyethylene film, a polyvinyl alcohol film or a polymethyl methacrylate film (preferably a polyethylene terephthalate film) ;

[0012] C1: The surface of the base film layer coated with the back coating layer needs to be treated to a dyne value > 38 before coating (the surface treatment method can use corona treatment).

[0013] The preparation method of the release layer in the above technical solution is to disperse the first resin, wax powder and inorganic particles in the first solvent, and grind to obtain a release coating liquid, coat the release coating liquid on the surface of the base film layer and heat to dry to obtain the release layer.

[0014] The release layer in the above technical solution meets at least one of the following conditions A2-M2:

[0015] A2: The first resin is an acrylonitrile-butadiene-styrene copolymer resin, a polystyrene resin, a polycarbonate resin or a polymethyl methacrylate resin (the first resin is a bonding resin, considering the release effect, weather resistance and anti-migration performance of the release layer, the first resin preferably uses a high molecular weight polyacrylic resin) ;

[0016] B2: The Tg value of the first resin is 80-150 ℃, and the molecular weight is 200000-500000;

[0017] C2: the wax powder is at least one of Fischer-Tropsch wax, polyethylene wax, polytetrafluoroethylene wax, polypropylene wax, ethylene-vinyl acetate copolymer wax, oxidized polyethylene wax, carnauba wax, beeswax or a modified product thereof (selected as polyethylene type, more preferably polytetrafluoroethylene modified polyethylene wax powder);

[0018] D2: the drop melting point of the wax powder is 90-130°C, and the median particle size is 3-8μm;

[0019] E2: the mass ratio of the first resin and the wax powder is 7:3-9:1 (which can be any one of 7:3, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1 and 9:1 or a range corresponding to any two values);

[0020] F2: the inorganic particles are at least one of aluminum particles, calcium carbonate particles, silica particles and metal oxide particles (and the metal oxide particles can be at least one of zirconium oxide particles, titanium oxide and zinc oxide particles);

[0021] G2: the particle size D50 in the release coating liquid is 0.1-0.5μm (so as to ensure that the coated film surface of the release layer is fine);

[0022] H2: the coating method of the release coating liquid is gravure coating or slit coating;

[0023] I2: the first solvent is at least one of 2-butanone, toluene, xylene, ethyl acetate, butyl acetate and propylene glycol methyl ether acetate;

[0024] J2: the addition amount of the inorganic particles in the release coating liquid is 0.1-5wt% (which can be any one of 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt% and 5wt% or a range corresponding to any two values);

[0025] K2: the content of the first solvent in the release coating liquid is 70-90wt% (which can be any one of 70wt%, 75wt%, 80wt%, 85wt% and 90wt% or a range corresponding to any two values);

[0026] L2: the drying temperature after the release coating liquid is coated is 60-120°C, and the drying time is 60-120s (the drying temperature and the drying time are inversely proportional, i.e. the higher the drying temperature, the shorter the drying time, and vice versa, the lower the drying temperature, the longer the drying time);

[0027] M2: the first resin in the release coating solution is added in an amount of 5-20wt% (any one value or a range between any two values among 5wt%, 10wt%, 15wt% and 20wt% can be used).

[0028] The preparation method of the protective layer in the technical solution is: dissolving the second resin in the second solvent, then adding the first auxiliary material, mixing uniformly to obtain the protective layer coating, coating the protective layer coating on the surface of the release layer and drying and curing to obtain the protective layer.

[0029] The first auxiliary material includes at least one of an auxiliary agent, a light stabilizer and a free radical trapping agent.

[0030] The protective layer in the technical solution meets at least one of the following conditions A3-K3:

[0031] A3: the second resin is at least one of acrylic resin, chloroethylene-vinyl acetate, chloroethylene-vinyl isobutyl ether, polyurethane and ethylene-vinyl acetate (in order to make the protective layer also have better aging resistance, the second resin is preferably thermoplastic acrylic resin, specifically, the acrylic resin includes polymers or derivatives of acrylic acid or methacrylic acid, polymers or derivatives of acrylate or methacrylate, copolymers or derivatives of acrylic acid or methacrylic acid and other monomers, copolymers or derivatives of acrylate or methacrylate and other monomers, and the other monomers can be aromatic hydrocarbons, compounds containing aromatic groups, compounds containing amide groups, chloroethylene, styrene, benzyl styrene, phenoxyethyl methacrylate, acrylamide or methacrylamide);

[0032] B3: the molecular weight of the second resin is 5000-300000, and the Tg value is 40-120℃;

[0033] C3: the auxiliary agent is inorganic microparticles and / or solid-liquid lubricant (the auxiliary agent can improve the friction resistance of the protective layer, the inorganic microparticles can be at least one of silica, alumina, titanium dioxide, molybdenum disulfide, calcium carbonate and talc powder, and the solid-liquid lubricant can be at least one of microcrystalline wax, carnauba wax, paraffin wax, low molecular weight polyethylene wax (such as polyethylene homopolymer or copolymer with a molecular weight of 1000-20000), wood wax, beeswax, whale wax, wool wax, candelilla wax, vaseline, polyester wax, modified wax (such as oxidized polyethylene wax, polyamide modified polyethylene wax, polytetrafluoroethylene modified polyethylene wax, modified carnauba wax or modified beeswax) and metal soaps, and the metal soaps can be at least one of zinc stearate, zinc stearate, calcium stearate and magnesium stearate, preferably, the auxiliary agent is microfine talc powder with a mesh size of 5000-12000 and a specific surface area of 5-10g / m 2 );

[0034] D3: the light stabilizer is at least one of a light screen, an ultraviolet absorber, a quencher, a radical scavenger, and a hydroperoxide decomposer;

[0035] E3: the light stabilizer is at least one of a light screen, an ultraviolet absorber, a quencher, a radical scavenger, and a hydroperoxide decomposer [in order to improve the outdoor weatherability of the product, a certain amount of light stabilizer needs to be added to the protective layer, taking the polyacrylic resin as an example, the sensitive wavelength of which is 290-315 nm, so at least one of the following light stabilizers can be selected: o-hydroxybenzophenone, benzotriazole, salicylate, triazine, and substituted acrylonitrile, and the solid-state triazine ultraviolet absorber is particularly preferred, wherein the absorption mechanism of the triazine ultraviolet absorber is based on two parts: one is that the compound is a conjugated π electron system structure, and the other is that the structure of the compound can move hydrogen, and the intramolecular hydrogen bond between the ortho-hydroxyl group on the benzene ring and the nitrogen atom on the adjacent triazine ring forms a six-membered ring, and the six-membered ring and the surrounding structure form a conjugated system, the energy required to open the chelate ring is similar to the ultraviolet light energy in the UVA (ultraviolet A) and UVB (ultraviolet B) range, when the molecule itself absorbs ultraviolet light, the molecular energy increases, the weakest N-H bond in the six-membered ring breaks, and the absorbed energy is released in the form of harmless heat energy, fluorescence or phosphorescence, and the molecular structure is restored, thereby repeatedly absorbing a large amount of ultraviolet light and protecting the polymer; in addition, the ultraviolet resistance effect of the solid-state ultraviolet absorber is better than that of the liquid-state ultraviolet absorber, because the solid-state ultraviolet absorber can better embed the resin in the protective layer, like the effect of a filler, so it is more resistant to migration and can exhibit better resistance, while most liquid-state ultraviolet absorbers do not have this effect and are more prone to migration during use, resulting in poor resistance; secondly, the alcohol rubbing resistance of the solid-state ultraviolet absorber is better than that of the liquid-state ultraviolet absorber, because the solid-state ultraviolet absorber can better embed the resin in the protective layer, maintaining the tightness of the protective layer, while the liquid-state ultraviolet absorber makes the structure of the protective layer more loose, and most liquid-state additives have good adhesion, while the acrylic resin itself is brittle, which can cause the acrylic resin to form resin clusters due to the adhesion of the liquid-state additive during the rubbing process, further damaging the protective layer and reducing the alcohol resistance; in addition, the use of ultraviolet absorbers with a large molecular weight can effectively reduce the risk of migration, and preferably, the solid-state triazine ultraviolet absorber has a melting point of 85-110°C and a molecular weight of greater than 3000; wherein the radical scavenger is a hindered amine substance (in order to further enhance the ultraviolet resistance of the protective layer, a certain amount of radical scavenger needs to be contained in the protective layer, in order to ensure better stability of the radical scavenger and prolong its action time, the molecular weight of the used radical scavenger is greater than 3000).

[0036] F3: the amount of the auxiliary in the back coating paint is 0.1-5wt% (may be any one of 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt% and 5wt% or the corresponding range between any two values);

[0037] G3: the sum of the amount of the light stabilizer and the free radical trapping agent in the back coating is 1-10wt% (may be any one of 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% and 10wt% or the corresponding range between any two values);

[0038] H3: the amount of the second solvent in the protective layer paint is 70-90wt% (may be any one of 70wt%, 75wt%, 80wt%, 85wt% and 90wt% or the corresponding range between any two values);

[0039] I3: the coating method of the protective layer paint is gravure coating or slot coating;

[0040] J3: the drying temperature of the protective layer paint after coating is 60-120℃, and the drying time is 60-120s (the drying temperature and the drying time are inversely proportional, that is, the higher the drying temperature, the shorter the drying time, and vice versa, the lower the drying temperature, the longer the drying time);

[0041] K3: the amount of the second resin in the protective layer paint is 5-20wt% (may be any one of 5wt%, 10wt%, 15wt% and 20wt% or the corresponding range between any two values).

[0042] The preparation method of the back coating in the above technical solution is: dissolving the third resin in the third solvent, then adding the second auxiliary, mixing to obtain the back coating paint, coating the back coating paint on the surface of the base film layer and drying to obtain the back coating;

[0043] The second auxiliary includes isocyanate compound, inorganic filler and release agent.

[0044] The back coating in the above technical solution meets at least one of the following conditions A4-N4:

[0045] A4: the third resin is at least one of polyester resin, polyacrylate resin, polyvinyl acetate resin, styrene acrylate resin, polyurethane resin, polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, polyether resin, polyamide resin, polyimide resin, polyamide-imide resin, polycarbonate resin, polyacrylamide resin, polyvinyl chloride resin, polyvinyl butyral resin, polyvinyl acetyl acetal resin, polyvinyl acetal resin or silicone modified products thereof (the third resin is a thermoplastic resin, preferably polyvinyl butyral resin);

[0046] B4: the isocyanate compound is at least one of aromatic isocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate (in order to improve the heat resistance of the back coating layer during the heat laminating process, improve the adhesion of the back coating layer to the base film layer and reduce the viscosity of the back coating layer at high temperature, an isocyanate compound can be added to the back coating layer, the type of the isocyanate compound is not particularly limited, but preferably aromatic isocyanate is used, as aromatic isocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, toluidine diisocyanate, p-phenylene diisocyanate, toluene diisocyanate or diphenylmethane diisocyanate can be used) ;

[0047] C4: the inorganic filler is at least one of talc, kaolin, calcium carbonate, aluminum hydroxide, silicon dioxide, graphite and boron nitride (preferably, the inorganic filler can use talc, the mesh number is 5000-11000 mesh) ;

[0048] D4: the release agent is at least one of phosphate ester compound, metal soap and silicone oil (preferably, the release agent is phosphate ester) ;

[0049] E4: the third solvent is at least one of acetone, 2-butanone, cyclohexanone, isophorone, tetrahydrofuran, ethyl acetate, butyl acetate, propyl acetate, toluene, xylene and DMF (dimethylformamide) (preferably, the third solvent uses 2-butanone and toluene mixed to form, wherein the mass ratio of 2-butanone and toluene is 1-4:1) ;

[0050] F4: the addition amount of the third resin in the third solvent can be within 100-500 mPa·s of the viscosity of the mixture at 25℃;

[0051] G4: the drying temperature of the back coating layer after coating is 60-120℃, and the drying time is 60-120s (the drying temperature and the drying time are inversely proportional, that is, the higher the drying temperature, the shorter the drying time, and vice versa, the lower the drying temperature, the longer the drying time).

[0052] H4: the coating method of the back coating paint is gravure coating or slot coating;

[0053] I4: the D50 particle size of the inorganic filler is 1.0-5um, and the D90 particle size is 3-10um (by controlling the particle size and particle size distribution of the inorganic filler, the purpose is to ensure uniform dispersion of the inorganic filler in the back coating layer, improve the good heat conduction performance of the back coating layer, improve the gloss after heat mounting, reduce the surface roughness, and improve the wear resistance);

[0054] J4: the addition amount of the third resin in the back coating paint is 5-20wt% (which can be any one value or a range corresponding to any two values between 5wt%, 10wt%, 15wt% and 20wt%);

[0055] K4: the addition amount of the isocyanate compound is 15-30% of the weight of the third resin (which can be any one value or a range corresponding to any two values between 15%, 20%, 25% and 30%);

[0056] L4: the addition amount of the inorganic filler in the back coating paint is 0.1-5wt% (which can be any one value or a range corresponding to any two values between 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt% and 5wt%);

[0057] M4: the addition amount of the release agent in the back coating paint is 0.1-2wt% (which can be any one value or a range corresponding to any two values between 0.1wt%, 0.5wt%, 1wt%, 1.5wt% and 2wt%);

[0058] N4: the addition amount of the third solvent in the back coating paint is 70-90wt% (which can be any one value or a range corresponding to any two values between 70wt%, 75wt%, 80wt%, 85wt% and 90wt%).

[0059] The second object of the present application is to provide a preparation method of the heat mounting protective carbon tape as described above, which is simple and convenient.

[0060] In order to achieve the above-mentioned object, the technical scheme of the present application is as follows: a preparation method of the heat mounting protective carbon tape as described above, comprising the following steps:

[0061] Step 1: prepare a release coating liquid, a protective layer paint and a back coating paint in advance for standby;

[0062] Step 2: take a base film layer, and perform surface treatment on the front surface of the base film layer;

[0063] Step 3: coating a back coating layer paint and a release coating liquid on the front and back of the base film layer respectively, and forming a back coating layer and a release layer after drying;

[0064] Step 4: coating a protective layer paint on the side of the release layer away from the base film layer, and forming a protective layer after drying.

[0065] The third object of the present application is to provide the application of the heat-mounting protective carbon tape for protecting the film-coating of the retroreflective film.

[0066] The present application has the advantages that the present application provides a protective carbon tape suitable for heat-mounting process and having high weather resistance and high glossiness, which exhibits higher brightness performance after heat-mounting film-coating than before film-coating, and has better weather resistance than heat-printing protective carbon tape; the thickness of the heat-mounting protective carbon tape is thicker than that of the heat-printing protective carbon tape, so it can resist the erosion of extremely harsh natural environment (the present application mainly thickens the release layer and the protective layer to improve the weather resistance of the heat-mounting protective carbon tape);

[0067] The functions of the release layer are: 1. ensuring the smooth demolding of the release layer during heat-mounting; 2. improving the glossiness of the surface of the retroreflective film after heat-mounting; 3. effectively blocking the migration of the additives in the protective layer after heat-mounting film-coating; 4. providing certain friction resistance and solvent resistance protection;

[0068] The functions of the protective layer are: 1. providing the adhesion between the layers after heat-mounting; 2. providing certain friction resistance and solvent resistance; 3. providing UV resistance for the retroreflective film in outdoor environment, prolonging the service life of the retroreflective film;

[0069] The functions of the back coating layer are: providing smoothness for the heating roller in the heat-mounting process, and helping to optimize heat transfer, ensuring that the heat generated by the heating roller of the heat-mounting machine can penetrate the base film layer more evenly and effectively, and the back coating layer can also prevent the carbon tape from sticking in the wound protective carbon tape. BRIEF DESCRIPTION OF DRAWINGS

[0070] Figure 1 The figure is a structural schematic diagram of the heat-mounting protective carbon tape.

[0071] In the figure: 1, back coating layer; 2, base film layer; 3, release layer; 4, protective layer. DETAILED DESCRIPTION

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Example 1

[0074] like Figure 1 As shown, this embodiment provides a heat-mounted protective carbon ribbon, comprising a back coating layer, a base film layer, a release layer, and a protective layer stacked sequentially; its specific manufacturing process is as follows:

[0075] A 12μm thick PET film is used as the base film layer. Corona discharge is applied to one side of the base film layer so that the dyne value of the base film layer surface is >38, which meets the requirements.

[0076] The back coating is applied to the corona-treated side of the base film by gravure coating and then dried to a thickness of 0.4 μm, thus forming the back coating.

[0077] A release coating liquid is applied to the other side of the base film layer and dried to a thickness of 3 μm, thus forming a release layer.

[0078] Apply a protective coating to the other side of the release layer and dry it to achieve a final thickness of 3 μm, thus forming the protective layer.

[0079] The specific materials are as follows (the manufacturer and / or model information is in square brackets after each material):

[0080] <1> The base film layer uses a 12μm thick PET film (Lumi rror, Toray Industries, Japan);

[0081] <2> The release coating solution is prepared as follows (by weight parts):

[0082] 9 parts of thermoplastic acrylic resin (MB-247 Bolier);

[0083] 1 part of PE wax powder (Tianshi wax powder PEW-0200);

[0084] One part talcum powder (MICRO ACE P-3 Japanese talcum powder);

[0085] 30 parts of methyl ethyl ketone;

[0086] 59 parts of toluene;

[0087] The above materials are mixed, and the resulting dispersion is ground in a mill (horizontal mill, zirconium bead particle size of 0.6 mm) to make the average particle size D50 in the dispersion = 0.1-0.4 μm, thereby obtaining the release layer coating liquid.

[0088] <3> The protective coating is prepared as follows (by weight parts):

[0089] 39 parts of methyl ethyl ketone;

[0090] 40 parts of toluene;

[0091] 10 parts of thermoplastic acrylic resin (BR-83, Mitsubishi Chemical Corporation);

[0092] 5 parts of ultraviolet absorber (UV-460 solid BASF);

[0093] 5 parts of ultraviolet absorber (UV-120 solid Milan Chemical);

[0094] One part talcum powder (MICRO ACE P-3 Japanese talcum powder);

[0095] Thermoplastic acrylic resin is dissolved in a mixed solvent of methyl ethyl ketone (MEK) and toluene, and then two UV absorbers and talc are added and mixed well to obtain a protective coating.

[0096] <4> The back coating is prepared as follows (by weight parts):

[0097] 3 parts of polyvinyl butyral (B265H-B Guangzhou Hongshang);

[0098] 7 parts of cellulose acetate butyrate (CAB393-3, Eastman Chemical Company, USA);

[0099] Isocyanate ( MDI-50 (Wanhua Chemical) 2.5 parts;

[0100] Talc powder (LJ-320 Liangjiang Chemical) 0.5 parts;

[0101] 0.2 parts of silicone oil (KF-6001 Shin-Etsu silicone);

[0102] 57.8 parts of methyl ethyl ketone (MEK);

[0103] 29 parts of toluene;

[0104] Polyvinyl butyral and cellulose acetate butyrate are dissolved in a mixed solvent of methyl ethyl ketone and toluene. Then isocyanate, silicone oil and talc are added. The resulting dispersion is then ground in a mill (horizontal mill, zirconium bead particle size of 0.6 mm) for 30 minutes. There are no particle size requirements, and the back coating is obtained.

[0105] <5> The heat laminating parameters are: heat laminating speed: 2.5 cm / s, heat laminating temperature: 100℃.

[0106] Example 2

[0107] The same as Example 1, except that the thickness of the base film layer is 6 μm.

[0108] Example 3

[0109] The same as Example 1, except that the heat laminating temperature is 120℃.

[0110] Example 4

[0111] The same as Example 1, except that the heat laminating speed is set to 5 cm / s.

[0112] Comparative Example 1

[0113] The same as Example 1, except that the thickness of the base film layer is 25 μm.

[0114] Comparative Example 2

[0115] The same as Example 1, except that the heat laminating temperature is 80℃.

[0116] Comparative Example 3

[0117] The same as Example 1, except that the heat laminating speed is set to 10 cm / s.

[0118] Comparative Example 4

[0119] The same as Example 1, except that the coating thickness of the release layer and the protective layer is reduced to 1 μm.

[0120] Comparative Example 5

[0121] The same as Comparative Example 4, except that the heat laminating process is not used for transfer printing, but a DTP-1300 traffic printer (self-developed by the applicant) is used for heat transfer film coating.

[0122] Comparative Example 6

[0123] The same as Example 1, except that the heat laminating process is not used for transfer printing, but a DTP-1300 traffic printer (self-developed by the applicant) is used for heat transfer film coating.

[0124] Performance test scheme:

[0125] Preparation of heat laminating protective carbon tape printing samples (Examples 1-4 and Comparative Examples 1-4): After the self-developed high-weather-resistant yellow ribbon of the applicant is transferred to a 3M Class V reflective film using a DTP-1300 traffic printer, a Yanpai 120 type 1700H full-automatic integrated low-temperature heat laminating machine is used to transfer the protective carbon tape to the ink layer.

[0126] Heat transfer protective carbon tape printing sample preparation (comparative example 5 and comparative example 6): using a DTP-1300 traffic printer, the applicant's self-developed high-weather-resistant yellow ribbon was transferred to a 3M type V reflective film, and a protective layer carbon tape was simultaneously transferred on the ink layer.

[0127] The test of the light transmittance of the protective layer uses a retroreflective test system to test the retroreflective coefficient before and after the transfer of the protective layer (observation angle 0.2°, incident angle -4°), and the light transmittance is calculated by the following formula: n = (m1 / m2)*100%, wherein n is the light transmittance, m1 is the retroreflective coefficient after the transfer of the protective layer, and m2 is the retroreflective coefficient without the transfer of the protective layer:

[0128] The ultraviolet transmittance test method refers to GB / T 17032-1997 Test method for ultraviolet transmittance of textiles and fabrics;

[0129] The solvent resistance test refers to the national standard GB-T 23989-2009 Determination of solvent resistance of coatings by wiping, and the ethanol resistance and gasoline resistance tests are carried out.

[0130] The stain resistance test refers to the national standard GB-T 9780-2013 Test method for stain resistance of architectural coatings.

[0131] The adhesion test refers to the national standard GB / T 9286-2021 Cross-hatch test for pigmented and clear coatings.

[0132] Test of weather resistance

[0133] According to the xenon lamp aging conditions in the national standard GB / T 18833-2012 Road traffic reflective film, a xenon lamp aging test box is used for aging for 1800 hours, and whether wrinkles, bubbles, cracks and other phenomena appear on the surface is observed; and the color difference value before and after accelerated aging is measured.

[0134] The performance of each example and comparative example is detected according to the above detection standards, and the specific detection results are shown in Table 1 below:

[0135] Table 1: Performance test results of each example and comparative example

[0136]

[0137] Note: " / " in Table 1 indicates that the corresponding item is not detected or cannot continue to be detected.

[0138] It can be seen from Example 1, Comparative Example 4-Comparative Example 6 that the protective carbon tape prepared by thickening the thickness of the release layer and the protective layer is not suitable for the thermal printing process, but can be transferred by the thermal laminating process, and the light transmittance (glossiness) and weather resistance of the protective carbon tape can be improved by thickening the thickness of the release layer and the protective layer; it can be seen from Example 1, Example 2 and Comparative Example 1 that the thickness of the base film layer is preferably about 12 μm (too small thickness will also affect the glossiness and weather resistance of the protective carbon tape), and too thick base film layer will affect the completeness of the thermal laminating transfer; it can be seen from Example 1, Example 3 and Comparative Example 2 that the thermal laminating temperature is preferably about 100°C, and too high or too low temperature will affect the glossiness and weather resistance of the protective carbon tape after the film transfer, and too low temperature will also affect the transfer effect; it can be seen from Example 1, Example 4 and Comparative Example 3 that the greater the thermal laminating speed, the lower the glossiness and weather resistance of the protective carbon tape after the film transfer.

[0139] The above has described the embodiments of the present application in detail, and the principles and implementation manners of the present application have been described by applying specific examples; the above description of the embodiments is only for helping to understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application scope can be changed, and the above description of the present application should not be understood as the limitation of the present application.

Claims

1. A heat mount protective carbon tape, characterized by, The back coating layer, the base film layer, the release layer and the protective layer are sequentially laminated; The thickness of the base film layer is 4-130 μm; The coating thickness of the release layer is 0.5-20 μm; The coating thickness of the protective layer is 0.5-20 μm; The coating thickness of the back coating layer is 0.4-1.2 μm; The surface of the base film layer coated with the back coating layer needs to be treated to have a da Vinci value of >38 before coating; The preparation method of the release layer is to disperse the first resin, wax powder and inorganic particles in the first solvent, and grind to obtain a release coating liquid, then coat the release coating liquid on the surface of the base film layer and heat to dry to obtain the release layer; The first resin is at least one of acrylonitrile-butadiene-styrene copolymer resin, polystyrene resin, polycarbonate resin or polymethyl methacrylate resin; The Tg value of the first resin is 80-150℃, and the molecular weight is 200000-500000; The preparation method of the protective layer is to dissolve the second resin in the second solvent, then add the first auxiliary material, mix to obtain a protective layer coating, then coat the protective layer coating on the surface of the release layer and dry to solidify to obtain the protective layer; The first auxiliary material includes an additive and a light stabilizer; The second resin is at least one of acrylic resin, chloroethylene-vinyl acetate, chloroethylene-vinyl isobutyl ether, polyurethane and ethylene-vinyl acetate; The molecular weight of the second resin is 5000-300000, and the Tg value is 40-120℃; The preparation method of the back coating layer is to dissolve the third resin in the third solvent, then add the second auxiliary material, mix to obtain a back coating layer coating, then coat the back coating layer coating on the surface of the base film layer and dry to solidify to obtain the back coating layer; The second auxiliary material includes an isocyanate compound, an inorganic filler and a release agent.

2. The heat mount protection ribbon of claim 1, wherein The back coating layer meets at least one of the following conditions A4-N4: A4: The third resin is at least one of polyester resin, polyacrylate resin, polyvinyl acetate resin, styrene acrylic acid ester resin, polyurethane resin, polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, polyether resin, polyamide resin, polyimide resin, polyamide-imide resin, polycarbonate resin, polyacrylamide resin, polyvinyl chloride resin, polyvinyl butyral resin, polyvinyl acetal resin and polyvinyl acetal resin; B4: The isocyanate compound is at least one of aromatic isocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate; C4: The inorganic filler is at least one of talc, kaolin, calcium carbonate, aluminum hydroxide, silicon dioxide, graphite and boron nitride; D4: The release agent is at least one of phosphate compound, metal soap and silicone oil; E4: The third solvent is at least one of acetone, 2-butanone, cyclohexanone, isophorone, tetrahydrofuran, ethyl acetate, butyl acetate, propyl acetate, toluene, xylene and DMF; F4: the third resin is added in the third solvent in an amount that can make the viscosity of the mixture at 25℃ within 100-500 mPa·s; G4: the drying temperature of the back coating paint after coating is 60-120℃, and the drying time is 60-120s; H4: the coating method of the back coating paint is gravure coating or slot coating; I4: the D50 particle size of the inorganic filler is 1.0-5um, and the D90 particle size is 3-10um; J4: the addition amount of the third resin in the back coating paint is 5-20wt%; K4: the addition amount of the isocyanate compound is 15-30% of the weight of the third resin; L4: the addition amount of the inorganic filler in the back coating paint is 0.1-5wt%; M4: the addition amount of the release agent in the back coating paint is 0.1-2wt%; N4: the addition amount of the third solvent in the back coating paint is 70-90wt%.

3. A method of producing a thermal mount protection ribbon according to any one of claims 1 to 2, characterized in that, The method comprises the following steps: Step 1: prepare the release coating liquid, the protective layer paint and the back coating paint in advance for standby; Step 2: take the base film layer, and perform surface treatment on the front side of the base film layer; Step 3: coat the back coating paint and the release coating liquid on the front and back sides of the base film layer respectively, and form the back coating layer and the release layer after drying; Step 4: coat the protective layer paint on the side of the release layer away from the base film layer, and form the protective layer after drying.

4. Use of a thermal mounting protection ribbon according to any one of claims 1-2, characterized in that, The method is used for film protection of the light reflecting film.

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