Composite shape-righting demolding belt

Abstract

The utility model relates to a composite shape-righting demoulding belt, and belongs to the technical field of demoulding belts. The structure of the composite shape-righting demolding belt consists of three parts, namely a heat-shrinkable plastic film, a bonding layer and a release layer, at least two layers of heat-shrinkable plastic films are arranged, the heat-shrinkable plastic films are bonded through the bonding layer, and the release layer is arranged on the outermost layer of the composite shape-righting demolding belt and has larger contractility, so that the surface of a wrapped material is smoother, and the quality of the wrapped material is improved. The problem that surface wrinkles appear after a traditional release film without heat shrinkage is cured is solved, and the release film has the potential of industrial production and application.

Description

Technical Field

[0001] The utility model relates to a composite orthopedic demoulding belt, belonging to the technical field of demoulding belts. Background Art

[0002] Stator wire rods are key components for preparing stator coils of large motors. Their quality will directly affect the service life and operating reliability of the coils and even the motors, and will greatly affect the key technical and economic indicators of motor operation.

[0003] The wire rod is mainly composed of conductors and insulating materials. The insulating material is made by tightly wrapping the impregnated mica tape or glass cloth around the conductor through the VPI process, placing it in a mold under pressure, and curing it after a certain temperature and time. Due to the pressure, irregular extrusion and dispersion of the colloid are inevitable, which in turn adheres to the mold, causing the surface of the wire rod (especially the narrow edge) to be uneven. These protrusions or depressions will affect the electric field distribution, and thus affect the operation of the motor.

[0004] At present, polytetrafluoroethylene (PTFE) film tape is mainly used for wrapping insulators, which has the advantages of high heat resistance, good flexibility, good electrical properties, low surface energy (not easy to stick to glue), low friction coefficient, etc.; such as the method of wrapping a VPI anti-corona barrier layer between the main insulation layer and the anti-corona layer of the stator coil disclosed in the prior art CN1929248A, in which the stator wire rod is also wrapped with mica tape and polytetrafluoroethylene demolding tape, which has the advantages of high heat resistance, good flexibility, good electrical properties, low surface energy (not easy to stick to glue), low friction coefficient, etc. However, polytetrafluoroethylene (PTFE) film tape does not have elasticity, does not shrink when heated, and cannot produce directional shrinkage force on the curing of the colloid. Therefore, irregular wrinkles will inevitably appear on the surface of the product wrapped with PTFE film tape after curing, which may affect the performance of subsequent products. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a composite orthopedic demoulding belt with greater shrinkage force, so that the surface of the wrapped material is smoother.

[0006] The technical solution of the utility model is as follows:

[0007] One of the purposes of the utility model is to provide a composite orthopedic release tape, the structure of which consists of three parts, including a heat-shrinkable plastic film, an adhesive layer and a release layer; the heat-shrinkable plastic film is provided with at least two layers, the heat-shrinkable plastic films are bonded to each other by an adhesive layer, and the release layer is provided on the outermost layer of the composite orthopedic release tape.

[0008] Wherein, the heat shrinkable plastic film is a heat shrinkable PET film or a PVC film.

[0009] The heat shrinkable plastic film is subjected to processes such as corona treatment, edge cutting, correction, and stress equalization.

[0010] The adhesive layer includes one or more of acrylic pressure-sensitive adhesive, polyurethane adhesive, vinyl acetate adhesive, urea-formaldehyde adhesive, and phenol-formaldehyde adhesive.

[0011] Wherein, the release layer is composed of a cured release agent.

[0012] Wherein, the thickness of the heat shrinkable plastic film is 0.01-0.05 mm.

[0013] Wherein, the thickness of the adhesive layer after curing is 0.002-0.01 mm.

[0014] The release agent may be a silicon release agent or a fluorine release agent.

[0015] Wherein, the thickness of the release layer after curing is 0.002-0.01 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] The reference numerals in the figure represent:

[0018] 1. Heat-shrinkable plastic film; 2. Adhesive layer; 3. Release layer. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figure 1 , the utility model provides a technical solution:

[0021] A composite orthopedic release tape, the structure of the composite orthopedic release tape consists of three parts, including a heat-shrinkable plastic film 1, an adhesive layer 2 and a release layer 3; the heat-shrinkable plastic film 1 is provided with at least two layers, the heat-shrinkable plastic films 1 are bonded by the adhesive layer 2, and the release layer 3 is provided on the outermost layer of the composite orthopedic release tape;

[0022] The heat-shrinkable plastic film 1 is a heat-shrinkable PET film or PVC film. After corona treatment, trimming, correction, stress equalization and other processes, the thickness of the heat-shrinkable plastic film 1 is 0.01-0.05 mm. The adhesive layer 2 includes one or more of acrylic pressure-sensitive adhesive, polyurethane adhesive, vinyl acetate adhesive, urea-formaldehyde adhesive, and phenolic adhesive. The thickness of the adhesive layer 2 after curing is 0.002-0.01 mm.

[0023] The release layer 3 is composed of a cured release agent, which may be a silicon-based release agent or a fluorine-based release agent. The thickness of the release layer 3 after curing is 0.002-0.01 mm.

[0024] The heat-shrinkable plastic film 1 used in the present application will shrink at a certain temperature, thereby imparting a regular shrinkage force to the wrapped material, making its surface smooth and regular; the shrinkage force is due to the characteristics of the heat-shrinkable base film, which will shrink at a certain temperature.

[0025] Since a layer of adhesive (low hardness and good toughness) is added between two layers of heat-shrinkable plastic films 1 (relatively large hardness and brittleness) as a bonding layer 2, the composite film is easily deformed after being subjected to force, thus having better flexibility, thereby wrapping the wrapped material more tightly and being easy to use.

[0026] The manufacturing method of the composite orthopedic release tape of this embodiment comprises the following steps:

[0027] S1: Mixing two different silicone monomers using a chain extender;

[0028] The chain extender used is an isocyanate trimer, the organic silicon monomer used is a terminal hydroxyl organic silicon monomer and an unsaturated organic silicon monomer, and the added amount of the chain extender is 30-80wt%.

[0029] S2: adding catalyst and solvent, and reflux reaction at a certain temperature;

[0030] The catalyst used is organic tin, chloroplatinic acid, etc., the solvent used is butanone, etc.; the temperature is 70-100° C., and the reaction time is 4-12 hours.

[0031] S3: After the reaction stops, the excess solvent is evaporated;

[0032] Specifically, the drying process is carried out at a temperature of 60-90°C;

[0033] S4: storing the prepared release agent away from light;

[0034] S5: pre-treating the heat-shrinkable plastic film 1, and rolling it up after edge trimming, correction, and stress equalization treatment;

[0035] The heat-shrinkable plastic film 1 is a heat-shrinkable PET film or a PVC film, and the pre-treatment may be performed by a corona treatment method, and the thickness is 0.01 to 0.05 mm.

[0036] S6: placing the release agent in the barrel of the equipment, adjusting the distance between the rollers, controlling the coating amount, and evenly coating the heat-shrinkable plastic film 1 by roller coating. After coating, the heat-shrinkable plastic film 1 enters the UV light box area to complete curing, and forms a release layer 3 on the surface;

[0037] The coating amount of release agent is 0.8-1.2g / m 2 , UV curing time is 10-60s, and the thickness of the release agent after curing is 0.002-0.01mm.

[0038] S7: Roll up with the side with the release agent facing outwards;

[0039] S8: Using a layer of non-heat-shrinkable release film as a substrate, coating a thermosetting adhesive, and heating the adhesive until it is completely cured after coating;

[0040] S9: The base film coated with the release agent and cured in S6 is put back on the coating machine to be unfolded, and the side of the base film without the release agent is laminated with the non-heat-shrinkable release film in S8. After lamination, the release film is peeled off, and the adhesive is transferred to the side of the base film without the release agent as the adhesive layer 2. The release film can be reused;

[0041] S10: After the other sides of the two groups of heat-shrinkable plastic films 1 coated with the release agent are bonded via the adhesive layer 2, they are rolled up and cut to obtain a product.

[0042] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A composite orthopedic release tape, characterized in that: The structure of the composite orthopedic release tape consists of three parts, including a heat-shrinkable plastic film (1), an adhesive layer (2) and a release layer (3); the heat-shrinkable plastic film (1) is provided with at least two layers, the heat-shrinkable plastic films (1) are bonded together by the adhesive layer (2), and the release layer (3) is provided on the outermost layer of the composite orthopedic release tape.

2. A composite orthopedic release tape as claimed in claim 1, characterized in that: The heat-shrinkable plastic film (1) is a heat-shrinkable PET film or a PVC film.

3. A composite orthopedic release tape as claimed in claim 1, characterized in that: The release layer (3) is composed of a cured release agent.

4. A composite orthopedic release tape as claimed in claim 2, characterized in that: The thickness of the heat-shrinkable plastic film (1) is 0.01-0.05 mm.

5. A composite orthopedic release tape as claimed in claim 1, characterized in that: The thickness of the adhesive layer (2) after curing is 0.002-0.01 mm.

6. A composite orthopedic release tape as claimed in claim 3, characterized in that: The release agent may be a silicon release agent or a fluorine release agent.

7. A composite orthopedic release tape as claimed in claim 3, characterized in that: The thickness of the release layer (3) after curing is 0.002-0.01 mm.

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