Double-layer masking masking tape with lower layer attached and upper layer peelable and preparation method thereof

Abstract

The present invention relates to the field of adhesive tapes, and in particular to a double-layer masking tape with a lower layer attached and an upper layer that can be peeled off and a preparation method thereof, the preparation method comprising: an adhesive is mainly prepared from the following components in parts by weight: 3-7 parts of acrylic resin, 25-35 parts of terpene resin, 3.5-5 parts of phenolic resin, 0.2-0.4 parts of polyether-modified silicon, 0.1-0.2 parts of polymethylsiloxane, 5-10 parts of silicon micropowder, and 2-4 parts of plasticizer; using masking paper as a substrate, controlling the moisture content to be 2%-4%, attaching a release agent layer on one side of the substrate, coating the adhesive on the other side of the substrate, placing in an oven at 120-140°C, drying for 4-5 minutes, and dividing to obtain the double-layer masking tape. The present invention adds polyether-modified silicon and polymethylsiloxane to the mixed resin to improve its high temperature resistance.

Description

Technical Field

[0001] The invention relates to the field of adhesive tapes, and in particular to a preparation method of a double-layer masking masking tape with a lower layer attached and an upper layer that can be peeled off and a preparation method thereof. Background Art

[0002] Masking tape is a self-adhesive tape with crepe paper impregnated with resin as the base material. It is used for sealing and packaging. It is used for masking during painting, coating and sandblasting. It is used to fix electronic components and wires. Double-layer masking masking tape generally has release paper on the bottom layer of the tape. Release paper is also called silicone oil paper or anti-stick paper. It mainly serves to isolate sticky objects.

[0003] Masking tapes used for masking have relatively high requirements for high temperature resistance. The existing ordinary masking tapes have poor high temperature resistance, which shortens their service life in masking. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for improving the high temperature resistance of a double-layer masking masking tape by adding polyether-modified silicone and polymethylsiloxane;

[0006] Correspondingly, the present invention also provides a method for preparing a double-layer masking tape with an attached lower layer and a peelable upper layer.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, the present invention provides a method for preparing a double-layer masking tape with a lower layer attached and an upper layer removable, comprising the following steps:

[0010] Preparation of S1 adhesive:

[0011] The adhesive is prepared from the following components in parts by weight: 3-7 parts of acrylic resin, 25-35 parts of terpene resin, 3.5-5 parts of phenolic resin, 0.2-0.4 parts of polyether modified silicon, 0.1-0.2 parts of polymethylsiloxane, 5-10 parts of silicon micropowder, and 2-4 parts of plasticizer;

[0012] S2 uses masking paper as a substrate, controls the moisture content to be 2% to 4%, adheres a release agent layer to one side of the substrate, coats the adhesive on the other side of the substrate, places it in an oven at 120 to 140° C., dries it for 4 to 5 minutes, and cuts it to obtain the double-layer masking tape.

[0013] Optionally, the raw materials of the adhesive are respectively as follows by weight: 4-6 parts of acrylic resin, 28-32 parts of terpene resin, 4-4.3 parts of phenolic resin, 0.2-0.3 parts of polyether modified silicon, 0.1-0.2 parts of polymethylsiloxane, 7-8 parts of silicon micropowder, and 3-4 parts of plasticizer.

[0014] Optionally, the preparation of the adhesive comprises the following sub-steps:

[0015] S11 phenolic resin, acrylic resin and sulfonic acid terpene resin are stirred and mixed at a temperature of 120-130°C;

[0016] S12: When the temperature drops to 45-55°C, add silicon micropowder, polyether modified silicon, polymethylsiloxane and plasticizer in sequence, raise the temperature to 70-80°C, mix and react for 5-8 minutes, and cool to room temperature to obtain the adhesive.

[0017] Optionally, the plasticizer is at least one of epoxidized fatty acid alkyl ester, trimellitic acid ester, and dioctyl sebacate.

[0018] Optionally, the coating process of S2 adopts a coating and gluing device, which includes a table, a tape introduction roller arranged outside one end of the table, a tape outlet roller arranged outside the other end of the table, and a coating mechanism arranged above the table; the coating mechanism includes a plurality of coating modules arrayed along the forward direction of the tape substrate; the coating module includes a vertically arranged glue chamber; the lower end of the glue chamber is an open end and a shrinking structure; an intermediate sheet is vertically arranged in the glue chamber; the intermediate sheet includes a rigid sheet, a retractable sheet, and a bendable sheet arranged in sequence from top to bottom The flexible sheet body and the brush glue body; the flexible sheet body partially extends downward from the lower end of the glue cavity, and there is a gap between the flexible sheet body and the shrinkage structure of the lower end of the glue cavity on the front and rear sides; the flexible sheet body includes an elastic resin sheet, a piezoelectric ceramic sheet array attached to both sides of the elastic resin sheet, and a first packaging layer for packaging the outer surface of the flexible sheet body; the surface of the first packaging layer is sprayed with nano anti-adhesive material; under the action of the electric field, one of the piezoelectric ceramic sheet arrays on both sides is extended while the other is shortened to drive the flexible sheet body to bend; the rigid sheet body divides the glue cavity into a front cavity and a rear cavity; the glue The panels on the front and rear sides of the liquid cavity are respectively provided with glue inlets above the shrinkage structure, which are connected to the front cavity and the rear cavity respectively; the panels are made of rigid plastic or wood, and electromagnets are fixedly attached to the outer surfaces of the panels; the rigid sheet is made of iron; a plurality of smooth arc guide rods of the same shape and parallel to each other are connected on the same horizontal plane between the panels on the front and rear sides of the rigid sheet; the arc guide rods slide through the rigid sheet respectively; the arc guide rods are convex in the middle and the arc center is located at the center of the lower end of the shrinkage structure; the on and off of the electromagnet and the size of the magnetic force are controlled by the circuit to control the rigid The flexible sheet body is characterized by forward and backward translation and translation speed; the rigid sheet body always points to the arc center of the guide arc rod under the constraint of the guide arc rod during the translation process and is deflected thereby; the bending direction of the flexible sheet body is opposite to the deflection direction of the rigid sheet body; the retractable sheet body is controlled to extend through an electric field according to the deflection of the rigid sheet body and the bending of the flexible sheet body so as to keep the distance and contact pressure between the brush colloid and the tape substrate stable; the retractable sheet body comprises a plurality of piezoelectric ceramic blocks stacked along its length direction and extendable in the length direction and a second packaging layer wrapped outside the retractable sheet body.

[0019] Optionally, compressible silica gel or sponge is detachably fixed on the inner wall of the panel above the glue inlet; when the rigid sheet moves and deflects to a larger angle, the compressible silica gel or sponge is squeezed.

[0020] Optionally, the contact surface between the tape base and the tape introduction roller is the surface to be coated with glue; an arc discharge plate is arranged outside the tape introduction roller, and a plurality of discharge cones are evenly arranged on the side of the arc discharge plate facing the tape introduction roller; the arc discharge plate releases electric charge to the surface of the tape introduction roller so that the surface of the tape introduction roller carries static charge.

[0021] Optionally, the contact surface between the tape base and the tape delivery roller is the back of the glue-coated surface; an arc-shaped preliminary baking plate is arranged outside the tape delivery roller; the arc-shaped preliminary baking plate includes an outer electric heating layer and an inner ceramic heat radiation layer; the ceramic heat radiation layer faces the glue-coated surface of the tape base.

[0022] The coating and gluing method using the coating and gluing device comprises the following steps:

[0023] ① The tape base is introduced through the tape introduction roller, passes through the top of the table and is led out by the tape lead-out roller; the arc-shaped discharge plate releases charges to the surface of the tape introduction roller through the discharge cone, so that the surface of the tape introduction roller carries static charges, and part of the static charges are transferred to the tape base, increasing its adsorption capacity for the glue liquid; initially, the middle sheet is vertically located in the middle of the glue liquid cavity, at this time, the magnetic forces of the electromagnets outside the front and rear panels are the same, the rigid sheet is located at the highest point in the middle of the guide arc rod, and the bottom of the brush glue just contacts the upper surface of the tape base; the spacing between the bendable sheet and the front and rear side shrinkage structures is the same; a certain amount of glue is injected into the front cavity and the rear cavity respectively through the glue inlet, and the gap between the bent sheet and the front and rear side shrinkage structures is just enough to prevent the glue liquid in the glue liquid cavity from flowing downwards out of the gap under the action of its own tension and viscosity;

[0024] ② Control the magnetic force of the electromagnet of the rear panel and reduce or disconnect the magnetic force of the electromagnet of the front panel; under the action of the magnetic attraction, the rigid sheet moves to one side of the rear panel. During the movement, due to the certain thickness of the rigid sheet and the arc structure of the guide arc rod, the lower end of the rigid sheet always deflects to the arc center of the guide arc rod, which is equivalent to the rotation of the middle sheet around the middle of the lower end of the shrinking structure. Therefore, the rotation of the middle sheet will not be restricted by the shrinking structure; in the later stage of the deflection stroke of the middle sheet, the rigid sheet squeezes the compressible silicone or sponge behind it, and the piezoelectric ceramic sheet array on the front side of the bendable sheet shortens, and moves toward The piezoelectric ceramic array on the rear side stretches, thereby driving the bendable sheet to bend forward; during the process of the middle sheet deflecting backward, the volume of the rear cavity is reduced, squeezing the glue therein, and the bendable sheet bends forward, so that the gap between the bendable sheet and the shrinking structure behind it increases, and the glue is squeezed out from the gap between the bendable sheet and the shrinking structure behind it. In addition, the bendable sheet bends forward at this time, so the side facing the rear is a convex arc surface, and the glue flows downward along the convex arc surface to the convex arc surface behind the brush colloid under the action of the Coanda effect; in this process, a certain amount of glue is squeezed into the front cavity through the glue inlet;

[0025] ③ Control the magnetic force of the electromagnet of the front panel, reduce or disconnect the magnetic force of the electromagnet of the rear panel; under the action of magnetic attraction, the rigid sheet moves to the side of the front panel, the upper part of the middle sheet deflects forward, and the lower brush colloid deflects backward. During the movement, since the distance between the brush colloid and the tape base changes from large to small and then to large, the retractable sheet is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid and the tape base, so that the distance and extrusion force between the brush colloid and the tape group remain stable; so that the brush colloid can be swept backward through its back to apply the glue in the state of bending forward; when the swing of the middle sheet is almost to the limit, the flexible sheet is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid and the tape base. , the piezoelectric ceramic array on the side facing forward is extended, and the piezoelectric ceramic array on the side facing backward is shortened, thereby driving the flexible sheet to bend backward; in the process of the middle sheet deflecting forward, the volume of the front cavity is reduced, squeezing the glue therein, and when the flexible sheet is converted to bend backward, the gap between the flexible sheet and the shrinking structure in front of it increases, and the glue is squeezed out from the gap between the flexible sheet and the shrinking structure in front of it. In addition, the flexible sheet bends backward at this time, so the side facing forward is a convex arc surface, and the glue flows downward along the convex arc surface to the convex arc surface in front of the brush colloid under the action of the Coanda effect; in this process, a certain amount of glue is squeezed into the rear cavity through the glue inlet;

[0026] ④Repeat steps ② and ③;

[0027] ⑤ When the brush-coated tape base is led out from the tape lead-out roller, it is preliminarily dried by the ceramic heat radiation layer which is heated by the electric heating layer and radiates infrared rays outward to reduce the fluidity of the adhesive liquid.

[0028] In a second aspect, the present invention also provides a double-layer masking masking tape with a lower layer attached and an upper layer that can be peeled off, obtained by the preparation method of any of the above schemes.

[0029] (III) Beneficial effects

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention adds polyether-modified silicon and polymethylsiloxane to the mixed resin of acrylic resin, terpene resin and phenolic resin to improve its high temperature resistance; polyether-modified silicon and polymethylsiloxane also play a defoaming function in this formula.

[0032] 2. The coating process of the present invention adopts a coating and gluing device. The existing coating roller essentially allows the glue to adhere to the tape base through extrusion contact. The contact time between the coating roller and the tape base is extremely short, which is point contact. Therefore, there is essentially no coating action. Complex requirements are imposed on the viscosity and fluidity of the glue, the material of the tape base, and the material and structure of the coating roller in order to achieve stable coating work. Since the glue adheres to the tape base instead of being smeared during the coating process of the existing coating roller, the glue does not flow on the tape base during the coating process. In addition to causing the aforementioned inconvenience, it is also prone to uneven coating, missing pieces, large thickness fluctuations, and easy mixing of tiny bubbles. Therefore, the adhesive surface on the existing tape using this coating process has uneven adhesion. Therefore, when tearing the tape, it is often felt that there is a sense of frustration in the process of tearing the tape, the force is uneven, the tearing sound is loud, and it cannot be torn smoothly and continuously. The present application simulates a back-and-forth brushing action, so that the contact time between the glue and the tape is longer and the contact area is larger. The active flow and flattening makes the glue adhere more evenly and the thickness is more uniform. The mixed tiny bubbles are easy to burst and expel the air, etc., and the coating process can be completed more evenly and efficiently. Moreover, because the simulated action is a smearing action rather than the existing direct adhesion action of the glue, the requirements for the glue are low, and it can be applicable to the coating of glues of different components.

[0033] 3. The coating and gluing device of the present invention adopts coating modules for array arrangement. On the one hand, it can be simply increased or decreased according to the coating speed requirements. Each coating module is independent of each other, and procurement, installation and maintenance are extremely convenient. In addition, by adopting different fineness structures and materials for the brush colloids of different coating modules, the gradual and fine coating can be achieved, thereby further improving the brushing speed and coating quality. The coating module utilizes the front and rear deflection of the intermediate sheet body to realize the front and rear swing of the brush colloid on the one hand, and the swing action changes the volume of the front cavity and the rear cavity to realize the extrusion of the glue and the glue filling of the brush colloid on the other hand. Since the deflection center of the middle sheet is located at the center of the lower end of the necking structure, it can ensure that the middle sheet will not be interfered by the necking structure during the deflection and swinging process. In this way, both the deflection and swinging action of the middle sheet and the flow restriction effect of the necking structure on the glue can be utilized, and the synchronous control of the glue liquid pressure in different cavities can be achieved, which cleverly overcomes the contradiction between the two in action and structure and realizes the coordination of multiple actions; and by utilizing the retractable sheet with the precisely controllable retractable characteristics of the piezoelectric ceramic block under the action of the electric field to supplement and balance the change in the distance between the brush colloid and the tape base during the deflection and swinging process, thereby ensuring the brush The distance and extrusion force between the colloid and the tape base overcomes the contradiction between the deflection and swinging action of the brush colloid and the need for continuous brushing. Moreover, the bending of the flexible sheet is achieved through the precisely controllable expansion and contraction characteristics of the piezoelectric ceramic array under the action of the electric field. On the one hand, this drives the angle change of the brush colloid, so that one side of the brush colloid is in contact with the tape base for coating, and the brush colloid coats the tape base at a certain tilt angle, which not only increases the contact area between the brush colloid and the tape base, but also meets the angle requirements during the coating process. On the other hand, it also increases the gap between the flexible sheet and the shrinkage structure on one side of it, just This side is the glue liquid that is pressurized by the movement of the middle sheet, so the glue liquid is squeezed out from the gap between the flexible sheet and the side shrinkage structure. In addition, the flexible sheet is bent to the opposite side at this time, so the side facing the extrusion position is a convex arc surface. Under the action of the Coanda effect, the glue liquid can smoothly flow downward along the convex arc surface to the convex arc surface behind the brush colloid, so as to replenish the glue liquid for the next coating surface. The device has a simple structure, precise and simple control, and it is easy to formulate and set action parameters according to specific needs. It is also cleverly designed and can achieve multiple beneficial action effects at the same time during a simple action process, thereby realizing the coating process efficiently and with high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a process flow chart of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the gluing device of the present invention in step ①;

[0036] Figure 3 This is a schematic diagram of the structure of the gluing device of the present invention in step ②;

[0037] Figure 4 for Figure 3 Enlarged diagram of the circle in the middle

[0038] Figure 5 This is a schematic diagram of the structure of the gluing device of the present invention in step ③;

[0039] Figure 6 It is a schematic structural diagram of the coating module of the present invention.

[0040] In the figure: 1. table; 2. tape introduction roller; 21. arc discharge plate; 22. discharge cone; 3. tape lead-out roller; 31. arc initial baking plate; 32. electric heating layer; 33. ceramic heat radiation layer; 4. coating mechanism; 5. coating module; 51. glue liquid chamber; 511. front chamber; 512. rear chamber; 513. panel; 514. glue inlet; 515. shrinkage structure; 52. bendable sheet; 521. elastic resin sheet; 522. piezoelectric ceramic sheet array; 523. first packaging layer; 53. brush colloid; 55. rigid sheet; 56. electromagnet; 57. guide arc rod; 58. retractable sheet; 581. piezoelectric ceramic block; 582. second packaging layer; 59. compressible silicone or sponge; 6. tape base. DETAILED DESCRIPTION

[0041] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods.

[0042] See also Figure 1 , Example 1

[0043] This embodiment provides a method for preparing a double-layer masking tape with a lower layer attached and an upper layer that can be peeled off, comprising the following steps:

[0044] Preparation of S1 adhesive:

[0045] S11: stirring and mixing phenolic resin, acrylic resin and sulfonic acid terpene resin at a temperature of 125°C;

[0046] S12, when the temperature drops to 48° C., add silicon powder, polyether modified silicon, polymethylsiloxane, and epoxidized fatty acid alkyl ester in sequence, raise the temperature to 75° C., mix and react for 7 minutes, and cool to room temperature to obtain the adhesive;

[0047] The above components are mixed by weight: 6 parts of acrylic resin, 28 parts of terpene resin, 4 parts of phenolic resin, 0.3 parts of polyether modified silicon, 0.15 parts of polymethylsiloxane, 8 parts of silicon powder, and 3 parts of epoxidized fatty acid alkyl ester;

[0048] S2 uses masking paper as a substrate, controls the moisture content to 3%, attaches a release agent layer to one side of the substrate, coats the adhesive on the other side of the substrate, places it in an oven at 130°C, dries it for 4.5 minutes, and cuts it to obtain a double-layer masking tape. Example 2

[0049] This embodiment provides a method for preparing a double-layer masking tape with a lower layer attached and an upper layer that can be peeled off, comprising the following steps:

[0050] Preparation of S1 adhesive:

[0051] S11: stirring and mixing phenolic resin, acrylic resin and sulfonic acid terpene resin at a temperature of 120°C;

[0052] S12: when the temperature drops to 55°C, add silicon powder, polyether modified silicon, polymethylsiloxane, dioctyl sebacate in sequence, raise the temperature to 72°C, mix and react for 8 minutes, and cool to room temperature to obtain the adhesive;

[0053] The above components are mixed by weight: 4 parts of acrylic resin, 26 parts of terpene resin, 3.8 parts of phenolic resin, 0.25 parts of polyether modified silicon, 0.2 parts of polymethylsiloxane, 6 parts of silicon powder, and 4 parts of dioctyl sebacate;

[0054] S2 uses masking paper as a substrate, controls the moisture content to 2.5%, adheres a release agent layer to one side of the substrate, coats the adhesive on the other side of the substrate, places it in an oven at 135°C, dries it for 4.5 minutes, and cuts it to obtain a double-layer masking tape. Example 3

[0055] This embodiment provides a method for preparing a double-layer masking tape with a lower layer attached and an upper layer that can be peeled off, comprising the following steps:

[0056] Preparation of S1 adhesive:

[0057] S11 phenolic resin, acrylic resin and sulfonic acid terpene resin are stirred and mixed at a temperature of 128°C;

[0058] S12, when the temperature drops to 48° C., add silicon powder, polyether modified silicon, polymethylsiloxane, and trimellitic acid ester in sequence, raise the temperature to 78° C., mix and react for 6 minutes, and then cool to room temperature to obtain the adhesive;

[0059] The above components are mixed by weight: 6 parts of acrylic resin, 33 parts of terpene resin, 4.8 parts of phenolic resin, 0.4 parts of polyether modified silicon, 0.1 parts of polymethylsiloxane, 6 parts of silicon powder, and 2 parts of trimellitic acid ester;

[0060] S2 uses masking paper as a substrate, controls the moisture content to 4%, adheres a release agent layer to one side of the substrate, coats the adhesive on the other side of the substrate, places it in an oven at 125°C, dries it for 4 minutes, and cuts it to obtain a double-layer masking tape.

[0061] The masking tapes obtained in Examples 1-3 were tested at 150° C. for 60 min. The hot and cold peeling of the tapes on steel plates and glass were normal. After peeling, no residual adhesive was left and the adhesive layer was not damaged.

[0062] In Examples 1-3, when the masking tapes without polyether-modified silicone or polymethylsiloxane were tested at 150° C. for 60 minutes, significant adhesive residue was left.

[0063] When the masking tape without polyether-modified silicone was tested at 150° C. for 60 min in Examples 1-3 as a comparison, only a slight phenomenon of residual adhesive was observed.

[0064] See also Figures 2 to 6In Examples 1-3, the existing coating roller essentially allows the glue to adhere to the tape base through extrusion contact. The contact time between the coating roller and the tape base is extremely short, which is point contact. Therefore, there is essentially no coating action. Complex requirements are placed on the viscosity and fluidity of the glue, the material of the tape base, and the material and structure of the coating roller in order to achieve stable coating work. Since the glue adheres to the tape base during the coating process of the existing coating roller instead of being smeared, the glue does not flow on the tape base during the coating process. In addition to causing the aforementioned inconvenience, it is also easy to cause uneven coating, missing pieces, large thickness fluctuations, and easy mixing of tiny bubbles. Therefore, the adhesive surface on the existing tape using this coating process has uneven adhesion. Therefore, when tearing the tape, it is often felt that there is a sense of frustration in the process of tearing the tape, the force is uneven, the tearing sound is loud, and it cannot be torn smoothly and continuously.To this end, further, the coating of S2 of the present application adopts a coating and gluing device, including a table 1, a tape introduction roller 2 arranged outside one end of the table 1, a tape outlet roller 3 arranged outside the other end of the table 1, and a coating mechanism 4 arranged above the table 1; the coating mechanism 4 includes a plurality of coating modules 5 arrayed along the forward direction of the tape base 6; the coating module 5 includes a vertically arranged glue chamber 51; the lower end of the glue chamber 51 is an open end and a shrinkage structure 515; an intermediate sheet is vertically arranged in the glue chamber 51; the intermediate sheet includes a rigid sheet 55, a retractable sheet 58, a flexible sheet 52 and a brush glue 53 arranged in sequence from top to bottom; the flexible sheet 53 The sheet 52 partially extends downward from the lower end of the glue cavity 51, and there is a gap between the bendable sheet 52 and the lower end shrinkage structure 515 of the glue cavity 51 on the front and rear sides; the bendable sheet 52 includes an elastic resin sheet 521, a piezoelectric ceramic sheet array 522 attached to both sides of the elastic resin sheet 521, and a first packaging layer 523 for packaging the outer surface of the bendable sheet 52; the surface of the first packaging layer 523 is sprayed with a nano anti-adhesive material; under the action of the electric field, one of the piezoelectric ceramic sheet arrays 522 on both sides is extended while the other is shortened to drive the bendable sheet 52; the rigid sheet 55 divides the glue cavity 51 into a front cavity 511 and a rear cavity 512; the glue cavity 5 The panels 513 on the front and rear sides are respectively provided with glue inlets 514 above the shrinking structure 515, which are connected to the front cavity 511 and the rear cavity 512 respectively; the panels 513 are made of rigid plastic or wood, and electromagnets 56 are fixedly attached to the outer surfaces of the panels 513; the rigid sheet 55 is made of iron; a plurality of smooth arc guide rods 57 of the same shape and parallel to each other are connected on the same horizontal plane between the panels 513 on the front and rear sides of the rigid sheet 55; the arc guide rods 57 slide through the rigid sheet 55 respectively; the arc guide rods 57 are convex in the middle and the arc center is located at the lower end center of the shrinking structure 515; the on and off of the electromagnet 56 and the size of the magnetic force are controlled by the circuit, To control the forward and backward translation and translation speed of the rigid sheet 55; during the translation process, the rigid sheet 55 always points to the arc center of the guide arc rod 57 under the constraint of the guide arc rod 57 and is deflected thereby; the bending direction of the flexible sheet 52 is opposite to the deflection direction of the rigid sheet 55; the retractable sheet 58 controls the elongation through the electric field according to the deflection of the rigid sheet 55 and the bending of the flexible sheet 52 to keep the distance and contact pressure between the brush colloid 53 and the tape base 6 stable; the retractable sheet 58 includes a plurality of piezoelectric ceramic blocks 581 stacked along its length direction and extendable in the length direction, and a second packaging layer 582 coated on the outside of the retractable sheet 58.

[0065] Furthermore, compressible silica gel or sponge 59 is detachably fixed on the inner wall of the panel 513 above the glue inlet 514 ; when the rigid sheet 55 moves and deflects to a larger angle, the compressible silica gel or sponge 59 is squeezed.

[0066] Furthermore, the contact surface between the tape base 6 and the tape introduction roller 2 is the surface to be coated with glue; an arc discharge plate 21 is arranged outside the tape introduction roller 2, and a plurality of discharge cones 22 are evenly arranged on the side of the arc discharge plate 21 facing the tape introduction roller 2; the arc discharge plate 21 releases electric charge to the surface of the tape introduction roller 2 so that the surface of the tape introduction roller 2 carries static charge.

[0067] Furthermore, the contact surface between the tape base 6 and the tape lead-out roller 3 is the back of the glue-coated surface; an arc-shaped preliminary baking plate 31 is arranged outside the tape lead-out roller 3; the arc-shaped preliminary baking plate 31 includes an outer electric heating layer 32 and an inner ceramic heat radiation layer 33; the ceramic heat radiation layer 33 faces the glue-coated surface of the tape base 6.

[0068] Further, the coating and gluing method comprises the following steps:

[0069] ① The adhesive tape base 6 is introduced through the adhesive tape introduction roller 2, passes through the top of the table 1, and is then led out by the adhesive tape lead-out roller 3; since the arc-shaped discharge plate 21 releases charges to the surface of the adhesive tape introduction roller 2 through the discharge cone 22, the surface of the adhesive tape introduction roller 2 carries static charges, and part of the static charges are transferred to the adhesive tape base 6, increasing its ability to adsorb adhesive liquid; initially, the middle sheet is vertically located in the middle of the adhesive liquid chamber 51, at which time the magnetic forces of the electromagnets 56 outside the front and rear panels 513 are the same, the rigid sheet 55 is located at the highest point in the middle of the guide arc rod 57, and the bottom of the brush adhesive 53 just contacts the upper surface of the adhesive tape base 6; the distance between the bendable sheet 52 and the front and rear side shrinkage structures 515 is the same; a certain amount of adhesive liquid is injected into the front cavity 511 and the rear cavity 512 respectively through the adhesive inlet 514, and the gap between the bendable sheet 52 and the front and rear side shrinkage structures 515 just prevents the adhesive liquid in the adhesive liquid chamber 51 from flowing downward out of the gap under the action of its own tension and viscosity;

[0070] ② Control the magnetic force of the electromagnet 56 of the rear panel 513, reduce or disconnect the magnetic force of the electromagnet 56 of the front panel 513; under the action of the magnetic attraction, the rigid sheet 55 moves to one side of the rear panel 513. During the movement, since the rigid sheet 55 has a certain thickness and the arc structure of the guide arc rod 57, the lower end of the rigid sheet 55 always deflects to the arc center of the guide arc rod 57, which is equivalent to the middle sheet rotating around the middle of the lower end of the shrinking structure 515. Therefore, the middle sheet will not be restricted by the shrinking structure 515. In the late stage of the deflection stroke of the middle sheet, the rigid sheet 55 squeezes the compressible silicone or sponge 59 behind it, and the piezoelectric ceramic sheet array 522 on the front side of the bendable sheet 52 The piezoelectric ceramic sheet array 522 on the side facing the rear is stretched, thereby driving the flexible sheet 52 to bend forward; during the process of the middle sheet deflecting backward, the volume of the rear cavity 512 is reduced, squeezing the glue therein, and the flexible sheet 52 is bent forward, so that the gap between the flexible sheet 52 and the rear shrinkage structure 515 is increased, and the glue is squeezed out from the gap between the flexible sheet 52 and the rear shrinkage structure 515. In addition, the flexible sheet 52 is bent forward at this time, so the side facing the rear is a convex arc surface. Under the action of the Coanda effect, the glue flows downward along the convex arc surface to the rear convex arc surface of the brush colloid 53; in this process, a certain amount of glue is squeezed into the front cavity 511 through the glue inlet 514;

[0071] ③ Control the magnetic force of the electromagnet 56 of the front panel 513, reduce or disconnect the magnetic force of the electromagnet 56 of the rear panel 513; under the action of the magnetic attraction, the rigid sheet 55 moves to the side of the front panel 513, the upper part of the middle sheet deflects forward, and the lower brush colloid 53 deflects backward. During the movement, since the distance between the brush colloid 53 and the tape base 6 changes from large to small and then to large, the retractable sheet 58 is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid 53 and the tape base 6, so that the distance and extrusion force between the brush colloid 53 and the tape group 6 remain stable; thereby, the brush colloid 53 is swept backward through its back in a state of bending forward to apply the glue; when the swing of the middle sheet is almost to the limit, the flexible sheet 52 is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid 53 and the tape base 6, so that the distance and extrusion force between the brush colloid 53 and the tape group 6 remain stable; thereby, the brush colloid 53 is swept backward through its back to apply the glue; when the swing of the middle sheet is almost to the limit, the flexible sheet 52 is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid 53 and the tape base 6, so that the distance between the brush colloid 53 and the tape group 6 and the extrusion force remain stable; thereby, the brush colloid 53 is bent forward to apply the glue; when the swing of the middle sheet is almost to the limit, the flexible sheet 52 is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brush colloid 53 and the tape base 6, so that the distance between the brush colloid 53 and the tape group 6 and the ex , the piezoelectric ceramic array 522 on the side facing forward is extended, and the piezoelectric ceramic array 522 on the side facing backward is shortened, thereby driving the flexible sheet 52 to bend backward; in the process of the middle sheet deflecting forward, the volume of the front cavity 511 is reduced, squeezing the glue therein, and when the flexible sheet 52 is converted to bend backward, the gap between the flexible sheet 52 and the front shrinkage structure 515 is increased, and the glue is squeezed out from the gap between the flexible sheet 52 and the front shrinkage structure 515. In addition, the flexible sheet 52 is bent backward at this time, so the side facing forward is a convex arc surface, and the glue flows downward along the convex arc surface to the front convex arc surface of the brush glue 53 under the action of the Coanda effect; in this process, a certain amount of glue is squeezed into the rear cavity 512 through the glue inlet 514;

[0072] ④Repeat steps ② and ③;

[0073] ⑤ When the brush-coated tape base 6 is led out from the tape lead-out roller 3, it is preliminarily dried by the ceramic heat radiation layer 33 which is heated by the electric heating layer 32 and radiates infrared rays outward to reduce the fluidity of the glue solution.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a double-layer masking tape with a lower layer attached and an upper layer that can be peeled off, characterized in that: The following steps are involved: Preparation of S1 adhesive: The adhesive is prepared from the following components in parts by weight: 3-7 parts of acrylic resin, 25-35 parts of terpene resin, 3.5-5 parts of phenolic resin, 0.2-0.4 parts of polyether modified silicon, 0.1-0.2 parts of polymethylsiloxane, 5-10 parts of silicon micropowder, and 2-4 parts of plasticizer; S2 uses masking paper as a substrate, controls the moisture content to be 2% to 4%, adheres a release agent layer to one side of the substrate, coats the adhesive on the other side of the substrate, places it in an oven at 120 to 140° C., dries it for 4 to 5 minutes, and cuts it to obtain the double-layer masking tape; The coating process of S2 adopts a coating and gluing device, which comprises a table (1), a tape introduction roller (2) arranged outside one end of the table (1), a tape outlet roller (3) arranged outside the other end of the table (1), and a coating mechanism (4) arranged above the table (1); the coating mechanism (4) comprises a plurality of coating modules (5) arranged in an array along the forward direction of the tape base (6); the coating module (5) comprises a vertically arranged glue chamber (51); the lower end of the glue chamber (51) is an open end and a shrinkage structure (515); an intermediate sheet is vertically arranged in the glue chamber (51); the intermediate sheet comprises a rigid sheet (55), a retractable sheet (58), a bendable sheet (59), and a plurality of other sheets arranged in sequence from top to bottom. The flexible sheet (52) and the brush glue (53) are provided with a gap between the flexible sheet (52) and the lower end of the glue cavity (51) on the front and rear sides; the flexible sheet (52) comprises an elastic resin sheet (521), a piezoelectric ceramic sheet array (522) attached to both sides of the elastic resin sheet (521), and a first packaging layer (523) for packaging the outer surface of the flexible sheet (52); the surface of the first packaging layer (523) is sprayed with a nano anti-adhesive material; under the action of an electric field, one of the piezoelectric ceramic sheet arrays (522) on both sides is stretched while the other is shortened to drive the flexible sheet (52) to bend; the rigid sheet The body (55) divides the glue chamber (51) into a front chamber (511) and a rear chamber (512); the panels (513) on the front and rear sides of the glue chamber (51) are respectively provided with glue inlets (514) located above the shrinkage structure (515), which are respectively connected to the front chamber (511) and the rear chamber (512); the panels (513) are made of rigid plastic or wood, and electromagnets (56) are respectively fixedly attached to the outer surfaces of the panels (513); the rigid sheet body (55) is made of iron; a plurality of smooth arc guide rods (57) of the same shape and parallel to each other are connected between the panels (513) on the front and rear sides of the rigid sheet body (55) on the same horizontal plane; the arc guide rods (57) respectively slide through the rigid sheet body (55) ; The guide arc rod (57) is convex in the middle, and its arc center is located at the center of the lower end of the shrinkage structure (515); the on and off of the electromagnet (56) and the magnitude of the magnetic force are controlled by the circuit to control the forward and backward translation and translation speed of the rigid sheet (55); during the translation process, the rigid sheet (55) always points to the arc center of the guide arc rod (57) under the constraint of the guide arc rod (57) and is deflected as a result; the bending direction of the bendable sheet (52) is opposite to the deflection direction of the rigid sheet (55); the retractable sheet (58) is extended by electric field control according to the deflection of the rigid sheet (55) and the bending of the bendable sheet (52) to keep the distance and contact pressure between the brush colloid (53) and the tape base (6) stable;The retractable sheet (58) comprises a plurality of piezoelectric ceramic blocks (581) stacked along its length direction and capable of being extended in the length direction, and a second packaging layer (582) covering the retractable sheet (58).

2. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 1, characterized in that: The raw materials of the adhesive are respectively as follows by weight: 4-6 parts of acrylic resin, 28-32 parts of terpene resin, 4-4.3 parts of phenolic resin, 0.2-0.3 parts of polyether modified silicon, 0.1-0.2 parts of polymethylsiloxane, 7-8 parts of silicon micropowder, and 3-4 parts of plasticizer.

3. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 1, characterized in that: The preparation of the adhesive includes the following sub-steps: S11 phenolic resin, acrylic resin and sulfonic acid terpene resin are stirred and mixed at a temperature of 120-130°C; S12: When the temperature drops to 45-55°C, add silicon micropowder, polyether modified silicon, polymethylsiloxane and plasticizer in sequence, raise the temperature to 70-80°C, mix and react for 5-8 minutes, and cool to room temperature to obtain the adhesive.

4. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 3, characterized in that: The plasticizer is at least one of epoxidized fatty acid alkyl ester, trimellitic acid ester, and dioctyl sebacate.

5. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 1, characterized in that: Compressible silica gel or sponge (59) is detachably fixed on the inner wall of the panel (513) above the glue inlet (514); when the rigid sheet (55) moves and deflects to a larger angle, the compressible silica gel or sponge (59) is squeezed.

6. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 5, characterized in that: The contact surface between the adhesive tape base (6) and the adhesive tape introduction roller (2) is the surface to be coated with adhesive; an arc-shaped discharge plate (21) is arranged outside the adhesive tape introduction roller (2), and a plurality of discharge cones (22) are evenly arranged on one side of the arc-shaped discharge plate (21) facing the adhesive tape introduction roller (2); the arc-shaped discharge plate (21) releases electric charge to the surface of the adhesive tape introduction roller (2) so that the surface of the adhesive tape introduction roller (2) carries static charge.

7. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 6, characterized in that: The contact surface between the tape base (6) and the tape lead-out roller (3) is the back side of the adhesive coating surface; an arc-shaped initial baking plate (31) is arranged outside the tape lead-out roller (3); the arc-shaped initial baking plate (31) comprises an outer electric heating layer (32) and an inner ceramic heat radiation layer (33); the ceramic heat radiation layer (33) faces the adhesive coating surface of the tape base (6).

8. The method for preparing the double-layer masking tape with a lower layer attached and an upper layer peelable as claimed in claim 7, characterized in that: The gluing method using the gluing device comprises the following steps: ① The adhesive tape base (6) is introduced through the adhesive tape introduction roller (2), passes through the top of the table (1), and is then led out by the adhesive tape lead-out roller (3); since the arc-shaped discharge plate (21) releases electric charge to the surface of the adhesive tape introduction roller (2) through the discharge cone (22), the surface of the adhesive tape introduction roller (2) carries static charge, and part of the static charge is transferred to the adhesive tape base (6), thereby increasing its ability to absorb adhesive liquid; initially, the middle sheet is vertically located in the middle of the adhesive liquid chamber (51), and at this time, the magnetic forces of the electromagnets (56) outside the front and rear panels (513) are the same. , the rigid sheet (55) is located at the highest point in the middle of the guide arc rod (57), and the bottom of the brush glue (53) just contacts the upper surface of the tape base (6); the distance between the bendable sheet (52) and the front and rear side shrinkage structures (515) is the same; a certain amount of glue is injected into the front cavity (511) and the rear cavity (512) respectively through the glue inlet (514), and the gap between the bendable sheet (52) and the front and rear side shrinkage structures (515) is just enough to prevent the glue in the glue cavity (51) from flowing downward out of the gap under the action of its own tension and viscosity; ② Control the magnetic force of the electromagnet (56) of the rear panel (513) to reduce or disconnect the magnetic force of the electromagnet (56) of the front panel (513); under the action of the magnetic attraction, the rigid sheet (55) moves toward the side of the rear panel (513). During the movement, due to the certain thickness of the rigid sheet (55) and the arc structure of the guide arc rod (57), the rigid sheet (55) deflects so that the lower end always points to the arc center of the guide arc rod (57), which is equivalent to the middle sheet rotating around the middle of the lower end of the shrinking structure (515). Therefore, the middle sheet will not be restricted from rotating by the shrinking structure (515); in the later stage of the deflection stroke of the middle sheet, the rigid sheet (55) squeezes the compressible silica gel or sponge (59) behind it, and the piezoelectric ceramic sheet array (59) facing the front side of the bendable sheet (52) 522) is shortened, and the piezoelectric ceramic sheet array (522) facing the rear is extended, thereby driving the flexible sheet (52) to bend forward; during the process of the middle sheet deflecting backward, the volume of the rear cavity (512) is reduced, squeezing the glue therein, and the flexible sheet (52) is bent forward, so that the gap between the flexible sheet (52) and the rear shrinkage structure (515) is increased, and the glue is squeezed out from the gap between the flexible sheet (52) and the rear shrinkage structure (515). In addition, the flexible sheet (52) is bent forward at this time, so the side facing the rear is a convex arc surface. Under the action of the Coanda effect, the glue flows downward along the convex arc surface to the rear convex arc surface of the brush glue (53); in this process, a certain amount of glue is squeezed into the front cavity (511) through the glue inlet (514); ③ Control the magnetic force of the electromagnet (56) of the front panel (513) to reduce or disconnect the magnetic force of the electromagnet (56) of the rear panel (513); under the action of the magnetic attraction, the rigid sheet (55) moves toward the side of the front panel (513), the upper part of the middle sheet deflects forward, and the brushing gel (53) at the lower part deflects backward. During the movement, since the distance between the brushing gel (53) and the tape base (6) changes from large to small and then to large, the retractable sheet (58) is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brushing gel (53) and the tape base (6), so that the distance and extrusion force between the brushing gel (53) and the tape base (6) remain stable; thereby, the brushing gel (53) is bent forward and the glue is applied backward through its back; when the swing of the middle sheet is almost to the limit, the flexible ... between the brushing gel (53) and the tape base (6) and the extrusion force remain stable; thereby, the brushing gel (53) is bent forward and the glue is applied backward through its back; when the swing of the middle sheet is almost to the limit, the flexible sheet (58) is controlled to gradually shorten to the initial length and then gradually extend to balance the change in the distance between the brushing gel (53) and the tape base (6), so that the distance 2), the piezoelectric ceramic array (522) on the side facing forward is extended, and the piezoelectric ceramic array (522) on the side facing backward is shortened, thereby driving the bendable sheet (52) to bend backward; during the process of the middle sheet deflecting forward, the volume of the front cavity (511) is reduced, squeezing the glue therein, and when the bendable sheet (52) is converted to bend backward, the gap between the bendable sheet (52) and the front shrinkage structure (515) increases, and the glue is squeezed out of the gap between the bendable sheet (52) and the front shrinkage structure (515). In addition, the bendable sheet (52) bends backward at this time, so the side facing forward is a convex arc surface. Under the action of the Coanda effect, the glue flows downward along the convex arc surface to the front convex arc surface of the brush glue (53); in this process, a certain amount of glue is squeezed into the rear cavity (512) through the glue inlet (514); ④Repeat steps ② and ③; ⑤ When the brush-coated tape base (6) is led out from the tape lead-out roller (3), it is preliminarily dried by the ceramic heat radiation layer (33) which is heated by the electric heating layer (32) and radiates infrared rays outward to reduce the fluidity of the adhesive solution.

9. A double-layer masking tape with an attached lower layer and a peelable upper layer, obtained by the preparation method according to any one of claims 1 to 8.

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