Cold stripping adhesive tape and preparation process thereof

Abstract

The invention relates to the technical field of adhesive tapes, in particular to a cold stripping adhesive tape and a preparation process thereof. The cold stripping adhesive tape comprises a base material, a pressure-sensitive adhesive layer, a release film layer and an antistatic coating, the antistatic coating is prepared from the following raw materials in parts by weight: 35 to 70 parts of acrylic emulsion, 15 to 30 parts of polytetrafluoroethylene emulsion, 15 to 25 parts of ethyl acetate, 3 to 8 parts of curing agent, 8 to 15 parts of filler, 10 to 30 parts of water and 30 to 60 parts of isopropanol. The functional silicon dioxide is added into the antistatic coating and consists of the carboxylated silicon dioxide and the amino-terminated antistatic agent, so that the adhesion of the functional silicon dioxide and an adhesive tape base material can be improved, and the prepared cold stripping adhesive tape can be easily stripped without residual adhesive when needed; the antistatic performance of the adhesive tape can also be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive tapes, in particular to a cold peeling adhesive tape and a preparation process thereof. Background Art

[0002] Adhesive tapes are widely used in numerous fields, and high adhesion is their most fundamental requirement. However, with the diversification of customer needs, conventional high-performance adhesive tapes, while providing high adhesion, can make disassembly, repair, and re-bonding difficult when the adhered objects need to be separated under certain conditions.

[0003] Cold-peel tape, also known as low-temperature release tape or cold-melting tape, is a specially designed adhesive material that maintains excellent adhesion even at low temperatures. This tape is particularly useful in certain applications, particularly where temporary bonding and securing operations are required in low-temperature environments. Cold-peel tape is widely used in the electronics, automotive, construction, and packaging industries. For example, in the electronics industry, it is used for temporary securing and transporting components; in automotive manufacturing, it is used for component assembly and repair; in the construction industry, it is used for temporary bonding of glass and metal panels; and in the packaging industry, it is used for securing and transporting goods.

[0004] Chinese invention patent CN 118834623A discloses a removable pressure-sensitive adhesive tape that leaves no adhesive residue and a method for preparing the same. The method for preparing the removable pressure-sensitive adhesive tape that leaves no adhesive residue comprises applying a release agent to one surface of a substrate and drying the tape; then directly applying the pressure-sensitive adhesive obtained by mixing a polyacrylic resin and a curing agent to the other surface of the substrate, drying the adhesive, and winding the tape to obtain the removable pressure-sensitive adhesive tape that leaves no adhesive residue. While this invention effectively solves the problem of leaving no adhesive residue when the tape is peeled off when not needed, the tape produced by this invention has relatively limited functionality and limited applications. The present invention aims to expand the application of this tape by developing a multifunctional cold-peelable tape and its preparation process. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a cold peeling tape and a preparation process thereof.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 35-70 parts by weight of acrylic emulsion, 15-30 parts by weight of polytetrafluoroethylene emulsion, 15-25 parts by weight of ethyl acetate, 3-8 parts by weight of a curing agent, 8-15 parts by weight of a filler, 10-30 parts by weight of water, and 30-60 parts by weight of isopropyl alcohol.

[0007] The substrate is any one of PP, PET, PE, and ethylene propylene rubber.

[0008] The thickness of the pressure-sensitive adhesive layer is 20-40 μm.

[0009] The thickness of the release film layer is 30-45 μm.

[0010] The thickness of the antistatic coating is 30-50 μm.

[0011] The curing agent is any one of isocyanate, hexamethylene diisocyanate, amine curing agent and polyamide curing agent.

[0012] Silica can be used as a reinforcing filler for adhesive tapes. It has a dense texture and a low water absorption rate, so it will not cause the adhesive solvent to be absorbed in large quantities, increasing the viscosity and making production more difficult. It is an ideal polymer-modified filler and can also remain stable in a variety of chemical environments. This allows cold-peel tapes to maintain their adhesion properties when exposed to different chemicals, improving the tape's chemical resistance, wear resistance, and weather resistance, while maintaining its peeling performance at low temperatures. However, silica does not have antistatic properties, and untreated silica has a large number of hydroxyl groups on its surface, which makes it very easy for silica particles to combine with each other to form an aggregate structure. This not only has a negative impact on the physical and mechanical properties of the silica-filled coating material, but also affects the adhesion performance of the tape. When the inorganic filling component is fully dispersed in the coating, a network structure is formed to form a pathway, achieving a more efficient functional effect. Based on this, the inventors have developed a grafted modified silica with a network-like uniformly dispersed structure, which further improves the antistatic performance characteristics of the material while improving the ease of peeling and mechanical performance of the tape.

[0013] In order to improve the antistatic property of the tape, the present invention realizes the antistatic effect of the tape by adding an antistatic agent during the preparation process of the filler. The present application first modifies silica by using KH-550 and succinic anhydride. On the one hand, the dispersion performance of titanium dioxide in the solvent can be improved, and the adhesion performance of the coating can be improved. On the other hand, a large number of carboxyl groups are increased on the surface of silica, providing effective active groups for the subsequent grafting of antistatic agents. Silica as a filler has high wear resistance and weather resistance. Through modification, not only the dispersion performance in the coating material can be improved, but also the mechanical properties of the tape, such as tensile strength and tear resistance, can be enhanced. To a certain extent, the antistatic effect can also be improved. The possible reason is that the modified silica forms a network structure in which the particles are interconnected and evenly distributed in the antistatic coating. Under the promotion of the dispersant modification, the antistatic components are enriched and induced to form a more efficient conductive path. And antistatic agent can improve antistatic effect, its mechanism of action is to reduce the material's barrier to electrons, improve the material's conductive effect, enable charge to be transferred on the surface and inside, avoid the generation of charge and accumulation, can provide an electron transmission path from the coating surface to the ground, quickly neutralize the static charge accumulated on the surface, reduce the risk of electrostatic discharge, can significantly improve the conductive properties of the tape, thereby effectively preventing static accumulation, and improving the friction properties of the material surface; the added antistatic agent has good compatibility with the polymer, presents electrical neutrality, is not easy to agglomerate, is evenly dispersed in the polymer, resulting in high stability ion polymer antistatic agent in the polymer is not easy to precipitate and migrate to the polymer surface phenomenon. Therefore, the present invention improves the antistatic properties of silicon dioxide by adding an antistatic agent, and the combination of the two can not only enhance the antistatic effect of the tape, but also improve the mechanical properties and peeling properties of the tape without leaving residual glue.

[0014] The filler is modified silica or functionalized silica.

[0015] The filler is modified silica, and the preparation method of the modified silica is as follows: 8-12 parts by weight of silica powder are mixed with 150-300 parts by weight of a 60-80wt% ethanol aqueous solution, ultrasonicated for 30-70 minutes at an ultrasonic power of 200-400W and an ultrasonic frequency of 40-80kHz, 1-3 parts by weight of KH-550 and 0.5-2 parts by weight of succinic anhydride are added, and the mixture is stirred at 30-40°C and 400-800rpm for 2-5 hours, centrifuged, washed, and dried to obtain the modified silica.

[0016] The specific reaction mechanism is as follows: S1: The silica powder is mixed with an ethanol aqueous solution and then ultrasonicated to help uniformly disperse the silica powder and improve its dispersibility. KH-550 and succinic anhydride are added to react with the hydroxyl groups on the surface of the silica to form carboxyl groups, thereby realizing the carboxylation of the silica and obtaining carboxylated silica; S2: Synthesis of intermediate A: Using valerolactam and decanediamine as the main reaction raw materials, under nitrogen protection, the hydrolysis of the amide bond is promoted by heating to form intermediate A; using m-phenylenedimethyl isocyanate and bis(hydroxyalkyl) di-terminated polydimethylsiloxane as reaction raw materials, and N,N-dimethylformamide as the reaction solvent, the reaction is carried out during heating and stirring to form intermediate B. Finally, using intermediate A and intermediate B as reaction raw materials, the reaction is carried out under heating conditions to obtain an amino-terminated antistatic agent; S3: Using carboxylated silica and an amino-terminated antistatic agent as reaction raw materials, the reaction is catalyzed by p-toluenesulfonic acid, and functionalized silica is formed through an amide reaction under heating conditions.

[0017] The functionalized silica prepared by the present invention can improve its adhesion to the tape substrate after surface treatment, thereby improving the adhesion of the tape, and improve the peeling resistance of the tape by improving the dispersion performance, so that it is not easy to break when peeled. The amino-terminated antistatic agent can reduce the static electricity accumulation of the tape during use and reduce the impact of static electricity on the performance of the tape. At the same time, grafting to the silica surface through an amide reaction can effectively improve the dispersion effect of silica in the antistatic coating. The two synergistically improve the antistatic effect and easy peeling performance.

[0018] Preferably, the filler is functionalized silica, and the preparation method of the functionalized silica is as follows: S1. 8-12 parts by weight of silicon dioxide powder are mixed with 150-300 parts by weight of a 60-80 wt% ethanol aqueous solution, ultrasonicated at an ultrasonic power of 200-400 W and an ultrasonic frequency of 40-80 kHz for 30-70 min, 1-3 parts by weight of KH-550 and 0.5-2 parts by weight of succinic anhydride are added, and stirred at 30-40° C. and 400-800 rpm for 2-5 h. The mixture is centrifuged, washed, and dried to obtain carboxylated silicon dioxide; S2, 15-28 parts by weight of valerolactam, 1-4 parts by weight of decanediamine, 1-4 parts by weight of water and 7-12 parts by weight of aminoacetic acid are stirred uniformly, hydrothermally reacted under nitrogen at 180-210° C. for 3-6 hours, and distilled under reduced pressure to obtain intermediate A; 1-3 parts by weight of m-phenylenedimethyl isocyanate, 15-26 parts of bishydroxyalkyl di-terminated polydimethylsiloxane and 150-240 parts by weight of N, N-dimethylformamide are mixed uniformly, stirred at 80-110° C. and 300-600rpm for 1-4 hours, and distilled under reduced pressure to obtain intermediate B; 8-14 parts by weight of intermediate A and 8-14 parts by weight of intermediate B and 180-300 parts by weight of N, N-dimethylformamide are mixed uniformly, reacted at 120-160° C. for 3-6 hours, and the solvent is distilled off under reduced pressure to obtain an amino-terminated antistatic agent; S3. Under a nitrogen environment, mix 2-5 parts by weight of the above-mentioned carboxylated silica, 7-14 parts by weight of the above-mentioned amino-terminated antistatic agent and 80-160 parts by weight of N,N-dimethylformamide, add 0.2-0.8 parts by weight of p-toluenesulfonic acid, react at 70-90°C and 200-600 rpm for 4-10 hours, cool to room temperature, filter, wash, and dry to obtain functionalized silica.

[0019] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, and drying the layer; coating an antistatic coating on the lower surface of the substrate, drying the layer, and winding the layer to obtain the cold peeling tape.

[0020] After corona treatment, the surface of the PET substrate produces active groups such as hydroxyl and carboxyl groups that can be cross-linked, which can enhance its adhesion to the acrylic pressure-sensitive adhesive and antistatic layer through chemical and physical effects, thereby reducing the adhesive retention rate of high-viscosity tape peeling.

[0021] Beneficial effects of the present invention: The present invention provides a cold-peel tape and a preparation process thereof, wherein functionalized silica is added to the antistatic coating, wherein the functionalized silica is composed of carboxylated silica and an amino-terminated antistatic agent, which not only improves its adhesion to the tape substrate so that the prepared cold-peel tape can be easily peeled off when needed without leaving any residual adhesive, but also improves the dispersion performance to improve the peeling resistance of the tape, so that it is not easy to break when peeled. The amino-terminated antistatic agent can reduce the static electricity accumulation of the tape during use and reduce the influence of static electricity on the performance of the tape. The two synergistically improve the antistatic effect and easy peeling performance. DETAILED DESCRIPTION

[0022] The above content of the present invention will be further described in detail below in conjunction with specific embodiments, but it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments.

[0023] Introduction of some raw materials in this application: Acrylic emulsion was purchased from Shanghai Zhenlishi Network Technology Co., Ltd., product number ST-954.

[0024] Polytetrafluoroethylene emulsion was purchased from Dongguan Shangyi Plastic Co., Ltd. with the brand name D-210C.

[0025] Bis(hydroxyalkyl) di-terminated polydimethylsiloxane was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd., product number lnb-1593.

[0026] The release agent was purchased from Jining Fangyu Chemical Co., Ltd., model YF-601.

[0027] Example 1 A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 50 parts by weight of acrylic emulsion, 20 parts by weight of polytetrafluoroethylene emulsion, 18 parts by weight of ethyl acetate, 6 parts by weight of a curing agent, 12 parts by weight of a filler, 15 parts by weight of water, and 40 parts by weight of isopropyl alcohol.

[0028] The substrate is PET.

[0029] The curing agent is isocyanate.

[0030] The filler is silicon dioxide.

[0031] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate, wherein the acrylic pressure-sensitive adhesive layer has a thickness of 30 μm; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, wherein the release film layer has a thickness of 35 μm, and drying; coating an antistatic coating on the lower surface of the substrate, wherein the antistatic coating has a thickness of 40 μm, drying, and winding to obtain the cold peeling tape.

[0032] Example 2 A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 50 parts by weight of acrylic emulsion, 20 parts by weight of polytetrafluoroethylene emulsion, 18 parts by weight of ethyl acetate, 6 parts by weight of a curing agent, 12 parts by weight of a filler, 15 parts by weight of water, and 40 parts by weight of isopropyl alcohol.

[0033] The substrate is PET.

[0034] The curing agent is isocyanate.

[0035] The filler is modified silica, and the preparation method of the modified silica is as follows: 10 parts by weight of silica powder is mixed with 200 parts by weight of a 70wt% ethanol aqueous solution, ultrasonicated at an ultrasonic power of 300W and an ultrasonic frequency of 70kHz for 45 minutes, 2 parts by weight of KH-550 and 1 part by weight of succinic anhydride are added, stirred at 35°C and 600rpm for 3 hours, centrifuged, washed, and dried to obtain the modified silica.

[0036] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate, wherein the acrylic pressure-sensitive adhesive layer has a thickness of 30 μm; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, wherein the release film layer has a thickness of 35 μm, and drying; coating an antistatic coating on the lower surface of the substrate, wherein the antistatic coating has a thickness of 40 μm, drying, and winding to obtain the cold peeling tape.

[0037] Example 3 A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 50 parts by weight of acrylic emulsion, 20 parts by weight of polytetrafluoroethylene emulsion, 18 parts by weight of ethyl acetate, 6 parts by weight of a curing agent, 12 parts by weight of a filler, 15 parts by weight of water, and 40 parts by weight of isopropyl alcohol.

[0038] The substrate is PET.

[0039] The curing agent is isocyanate.

[0040] The filler is functionalized silica, and the preparation method of the functionalized silica is as follows: S1: 20 parts by weight of valerolactam, 2 parts by weight of decanediamine, 2 parts by weight of water and 10 parts by weight of aminoacetic acid are uniformly mixed, hydrothermally reacted under nitrogen at 190° C. for 4 hours, and distilled under reduced pressure to obtain intermediate A; 2 parts by weight of m-phenylenedimethyl isocyanate, 20 parts of bishydroxyalkyl di-terminated polydimethylsiloxane and 180 parts by weight of N,N-dimethylformamide are uniformly mixed, stirred at 90° C. and 400 rpm for 2 hours, and distilled under reduced pressure to obtain intermediate B; 10 parts by weight of intermediate A and 10 parts by weight of intermediate B and 200 parts by weight of N,N-dimethylformamide are uniformly mixed, reacted at 140° C. for 4 hours, and the solvent is distilled under reduced pressure to obtain an amino-terminated antistatic agent; S3. Under a nitrogen environment, 3 parts by weight of silica, 10 parts by weight of the above-mentioned amino-terminated antistatic agent and 100 parts by weight of N,N-dimethylformamide were mixed, 0.4 parts by weight of p-toluenesulfonic acid were added, and the mixture was reacted at 80°C and 400 rpm for 6 hours. The mixture was cooled to room temperature, filtered, washed and dried to obtain functionalized silica.

[0041] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate, wherein the acrylic pressure-sensitive adhesive layer has a thickness of 30 μm; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, wherein the release film layer has a thickness of 35 μm, and drying; coating an antistatic coating on the lower surface of the substrate, wherein the antistatic coating has a thickness of 40 μm, drying, and winding to obtain the cold peeling tape.

[0042] Example 4 A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 50 parts by weight of acrylic emulsion, 20 parts by weight of polytetrafluoroethylene emulsion, 18 parts by weight of ethyl acetate, 6 parts by weight of a curing agent, 12 parts by weight of a filler, 15 parts by weight of water, and 40 parts by weight of isopropyl alcohol.

[0043] The substrate is PET.

[0044] The curing agent is isocyanate.

[0045] The preparation method of the filler is as follows: 20 parts by weight of valerolactam, 2 parts by weight of decanediamine, 2 parts by weight of water and 10 parts by weight of aminoacetic acid are uniformly mixed, hydrothermally reacted under nitrogen at 190° C. for 4 hours, and distilled under reduced pressure to obtain an intermediate A; 2 parts by weight of m-phenylenedimethyl isocyanate, 20 parts of bishydroxyalkyl di-terminated polydimethylsiloxane and 180 parts by weight of N,N-dimethylformamide are uniformly mixed, stirred at 90° C. and 400 rpm for 2 hours, and distilled under reduced pressure to obtain an intermediate B; 10 parts by weight of intermediate A and 10 parts by weight of intermediate B and 200 parts by weight of N,N-dimethylformamide are uniformly mixed, reacted at 140° C. for 4 hours, and the solvent is removed by distillation under reduced pressure to obtain a filler.

[0046] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate, wherein the acrylic pressure-sensitive adhesive layer has a thickness of 30 μm; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, wherein the release film layer has a thickness of 35 μm, and drying; coating an antistatic coating on the lower surface of the substrate, wherein the antistatic coating has a thickness of 40 μm, drying, and winding to obtain the cold peeling tape.

[0047] Example 5 A cold peeling tape comprises a substrate, a pressure-sensitive adhesive layer, a release film layer, and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 50 parts by weight of acrylic emulsion, 20 parts by weight of polytetrafluoroethylene emulsion, 18 parts by weight of ethyl acetate, 6 parts by weight of a curing agent, 12 parts by weight of a filler, 15 parts by weight of water, and 40 parts by weight of isopropyl alcohol.

[0048] The substrate is PET.

[0049] The curing agent is isocyanate.

[0050] The filler is functionalized silica, and the preparation method of the functionalized silica is as follows: S1, 10 parts by weight of silicon dioxide powder was mixed with 200 parts by weight of 70 wt% ethanol aqueous solution, ultrasonicated at an ultrasonic power of 300 W and an ultrasonic frequency of 70 kHz for 45 min, 2 parts by weight of KH-550 and 1 part by weight of succinic anhydride were added, and stirred at 35 ° C and 600 rpm for 3 h, centrifuged, washed, and dried to obtain carboxylated silicon dioxide; S2, 20 parts by weight of valerolactam, 2 parts by weight of decanediamine, 2 parts by weight of water and 10 parts by weight of aminoacetic acid were stirred, hydrothermally reacted under nitrogen at 190 ° C for 4h, and distilled under reduced pressure to obtain intermediate A; 2 parts by weight of m-phenylenedimethyl isocyanate, 20 parts of bishydroxyalkyl di-terminated polydimethylsiloxane and 180 parts by weight of N, N-dimethylformamide were mixed, stirred at 90 ° C, 400 rpm for 2h, and distilled under reduced pressure to obtain intermediate B; 10 parts by weight of intermediate A and 10 parts by weight of intermediate B and 200 parts by weight of N, N-dimethylformamide were mixed, reacted at 140 ° C for 4h, and the solvent was distilled under reduced pressure to obtain an amino-terminated antistatic agent; S3. Under a nitrogen environment, 3 parts by weight of the above-mentioned carboxylated silica, 10 parts by weight of the above-mentioned amino-terminated antistatic agent and 100 parts by weight of N,N-dimethylformamide were mixed, 0.4 parts by weight of p-toluenesulfonic acid were added, and the mixture was reacted at 80°C and 400 rpm for 6 hours. The mixture was cooled to room temperature, filtered, washed and dried to obtain functionalized silica.

[0051] The preparation process of the cold peeling tape comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate, wherein the acrylic pressure-sensitive adhesive layer has a thickness of 30 μm; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, wherein the release film layer has a thickness of 35 μm, and drying; coating an antistatic coating on the lower surface of the substrate, wherein the antistatic coating has a thickness of 40 μm, drying, and winding to obtain the cold peeling tape.

[0052] Test Example 1 Antistatic effect test: With reference to the national standard GB / T 31838.2-2019 "Dielectric and resistive properties of solid insulating materials Part 2: Resistance characteristics (DC method) Volume resistance and volume resistivity", the resistance test of the cold peeling tape prepared above was carried out. Each group was tested 5 times, and the average value was taken. The results are shown in Table 1; the peel strength was measured using Method 1 in the national standard GB / T2792-2014 "Test method for peel strength of adhesive tape". Each group was tested 5 times, and the average value was taken. The test results are shown in Table 1.

[0053] Table 1 Antistatic effect and peel strength test results of cold peeling tape

[0054] Test Example 2 Anti-pollution experiment: Cold peeling tape was attached to plain glass and treated at 80°C, 90% RH for one month. The protective tape was then removed and the surface condition of the plain glass was observed. The results are shown in Table 2.

[0055] Table 2 Peeling performance test results of cold peeling tape

[0056] From the above results, it can be seen that the cold-peeling tape prepared by the present invention has good antistatic effect and peeling strength, and there will be no residual glue when peeling when it is not needed, and the application scenario is relatively wide. Specifically comparing Examples 1-4, it can be seen that the functionalized silica prepared by the present invention can be applied to the cold-peeling tape to improve the peeling resistance of the tape, and there will be no residual glue when peeling when it is not needed. The reason is that on the one hand, it can improve the dispersion performance of titanium dioxide in the solvent and improve the adhesion performance of the coating. On the other hand, a large number of carboxyl groups are added to the surface of silica, providing effective active groups for the subsequent grafting of antistatic agents; silica as a filler has high wear resistance and weather resistance. Through modification, it can not only improve the dispersion performance in the coating material, but also enhance the mechanical properties of the tape, such as tensile strength and tear resistance, and to a certain extent, it can also improve the antistatic effect. The possible reason is that the modified silica forms a network structure in which the particles are interconnected and evenly distributed in the antistatic coating, which enriches the antistatic components under the promotion of dispersant modification and induces them to form a more efficient conductive path. And antistatic agent can improve antistatic effect, its mechanism of action is to reduce the material's barrier to electrons, improve the material's conductive effect, enable charge to be transferred on the surface and inside, avoid the generation of charge and accumulation, can provide an electron transmission path from the coating surface to the ground, quickly neutralize the static charge accumulated on the surface, reduce the risk of electrostatic discharge, can significantly improve the conductive properties of the tape, thereby effectively preventing static accumulation, and improving the friction properties of the material surface; the added antistatic agent has good compatibility with the polymer, presents electrical neutrality, is not easy to agglomerate, is evenly dispersed in the polymer, resulting in high stability ion polymer antistatic agent in the polymer is not easy to precipitate and migrate to the polymer surface phenomenon. Therefore, the present invention improves the antistatic properties of silicon dioxide by adding an antistatic agent, and the combination of the two can not only enhance the antistatic effect of the tape, but also improve the mechanical properties and peeling properties of the tape without leaving residual glue.

Claims

1. A cold peeling tape, characterized in that: The invention comprises a substrate, a pressure-sensitive adhesive layer, a release film layer and an antistatic coating; the antistatic coating is prepared from the following raw materials in parts by weight: 35-70 parts by weight of acrylic emulsion, 15-30 parts by weight of polytetrafluoroethylene emulsion, 15-25 parts by weight of ethyl acetate, 3-8 parts by weight of curing agent, 8-15 parts by weight of filler, 10-30 parts by weight of water and 30-60 parts by weight of isopropyl alcohol.

2. The cold peeling tape according to claim 1, wherein The substrate is any one of PP, PET, PE, and ethylene propylene rubber.

3. The cold peeling tape according to claim 1, wherein The thickness of the pressure-sensitive adhesive layer is 20-40 μm.

4. The cold peeling tape according to claim 1, wherein The thickness of the release film layer is 30-45 μm.

5. The cold peeling tape according to claim 1, wherein The thickness of the antistatic coating is 30-50 μm.

6. The cold peeling tape according to claim 1, wherein The curing agent is any one of isocyanate, hexamethylene diisocyanate, amine curing agent and polyamide curing agent.

7. The cold peeling tape according to claim 1, wherein The filler is modified silica or functionalized silica.

8. The cold peeling tape according to claim 7, wherein The modified silica is prepared by mixing 8-12 parts by weight of silica powder with 150-300 parts by weight of a 60-80 wt% ethanol aqueous solution, ultrasonically treating the mixture at an ultrasonic power of 200-400 W and an ultrasonic frequency of 40-80 kHz for 30-70 minutes, adding 1-3 parts by weight of KH-550 and 0.5-2 parts by weight of succinic anhydride, stirring the mixture at 30-40° C. and 400-800 rpm for 2-5 hours, centrifuging, washing, and drying to obtain the modified silica.

9. The cold peeling tape according to claim 7, wherein The preparation method of the functionalized silica is as follows: S1. 8-12 parts by weight of silicon dioxide powder are mixed with 150-300 parts by weight of a 60-80 wt% ethanol aqueous solution, ultrasonicated at an ultrasonic power of 200-400 W and an ultrasonic frequency of 40-80 kHz for 30-70 min, 1-3 parts by weight of KH-550 and 0.5-2 parts by weight of succinic anhydride are added, and stirred at 30-40° C. and 400-800 rpm for 2-5 h. The mixture is centrifuged, washed, and dried to obtain carboxylated silicon dioxide; S2, 15-28 parts by weight of valerolactam, 1-4 parts by weight of decanediamine, 1-4 parts by weight of water and 7-12 parts by weight of aminoacetic acid are stirred uniformly, hydrothermally reacted under nitrogen at 180-210° C. for 3-6 hours, and distilled under reduced pressure to obtain intermediate A; 1-3 parts by weight of m-phenylenedimethyl isocyanate, 15-26 parts of bishydroxyalkyl di-terminated polydimethylsiloxane and 150-240 parts by weight of N, N-dimethylformamide are mixed uniformly, stirred at 80-110° C. and 300-600rpm for 1-4 hours, and distilled under reduced pressure to obtain intermediate B; 8-14 parts by weight of intermediate A and 8-14 parts by weight of intermediate B and 180-300 parts by weight of N, N-dimethylformamide are mixed uniformly, reacted at 120-160° C. for 3-6 hours, and the solvent is distilled off under reduced pressure to obtain an amino-terminated antistatic agent; S3. Under a nitrogen environment, mix 2-5 parts by weight of the above-mentioned carboxylated silica, 7-14 parts by weight of the above-mentioned amino-terminated antistatic agent and 80-160 parts by weight of N,N-dimethylformamide, add 0.2-0.8 parts by weight of p-toluenesulfonic acid, react at 70-90°C and 200-600 rpm for 4-10 hours, cool to room temperature, filter, wash, and dry to obtain functionalized silica.

10. A process for preparing the cold peeling tape according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: coating an acrylic pressure-sensitive adhesive layer on the upper surface of a corona-treated PET substrate; coating a release agent on the surface of the acrylic pressure-sensitive adhesive layer to obtain a release film layer, and drying the layer; coating an antistatic coating on the lower surface of the substrate, drying the layer, and winding the layer to obtain a cold-peeling tape.

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