Release material and forming method thereof

Abstract

The invention discloses a release film and a forming method thereof. A release material comprises a fabric base material layer and a high polymer material layer located on the fabric base material layer. The high polymer material layer has release performance, the thickness of the high polymer material layer is larger than that of the fabric base material layer, lines of the fabric base material layer can be prevented from being copied to the surface of the high polymer layer, the flatness of the surface of the release material is prevented from being affected, the surface morphology of the high polymer material layer is more controllable, and the use frequency of the release material is increased; and the service life of the release material is prolonged. Besides, a process of firstly pressing and then foaming is adopted, so that the bonding strength of the polymer layer and the base material layer is improved, and the separation of the release material during release is prevented.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to a release material and a forming method thereof. Background Art

[0002] Generally speaking, release materials include a substrate and a release agent coated on the substrate. The type of release agent determines the release force of the release sheet. According to the type of substrate of the release material, it can be divided into release film and release cloth.

[0003] The substrate of the release film has a flat surface, such as paper or plastic film, but it is often not breathable. If air is allowed to enter between the release sheet and the foaming sheet precursor during the foaming process, it is easy to foam unevenly, or leave bubbles on the surface to produce holes, affecting the structure of the release film.

[0004] The release cloth itself is a fabric, but after the foam sheet is pressed during the forming process, the texture of the fabric will be copied onto the surface of the release cloth and the foam sheet precursor, which makes it difficult to produce a smooth surface and affects the viscosity of the release material. Summary of the invention

[0005] In order to solve the above technical problems, the present application discloses a release material and a forming method thereof, which can be used to prepare a release material with controllable surface morphology on a fabric material.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the release material comprises a fabric substrate layer and a polymer material layer located on the fabric substrate layer;

[0007] The polymer material layer has release performance, and the thickness of the polymer material layer is greater than the thickness of the fabric substrate layer.

[0008] Preferably, the thickness of the polymer material layer (20) is 2 to 4 times the thickness of the fabric substrate layer (10).

[0009] Preferably, the polymer material layer (20) has pores therein.

[0010] Preferably, the first surface (21) of the polymer material layer is a flat surface or is provided with preset patterns.

[0011] Preferably, the preset patterns include two continuous patterns and / or four continuous patterns.

[0012] A method for forming a release material as described above, characterized in that the method comprises the following steps:

[0013] S1: coating a polymer material having release properties on the surface (15) of the fabric substrate layer to obtain a release film;

[0014] S2: adding a foaming material precursor onto the release film, pressing the release film and the foaming material precursor together to perform a foaming reaction to obtain the release material.

[0015] Preferably, the polymer material in S1 includes one or more polar materials or non-polar materials.

[0016] Preferably, the polar material includes one or more of PVC and NBR, and the non-polar material includes one or more of SBR, PE, EVA and TPE.

[0017] Preferably, one or more of a dispersant, a stabilizer, a solubilizer, an emulsifier, a surfactant, an antioxidant, an anti-adhesive agent and an antibacterial agent may be incorporated into the S1 polymer material.

[0018] Preferably, in the pressing step in S2, gas is filled between the release film and the foaming material precursor.

[0019] Preferably, the pressing comprises pressing using a film molding pressing wheel.

[0020] Based on the above technical solution, this application has the following beneficial effects:

[0021] The present invention can prevent the texture of the fabric substrate layer from being copied to the surface of the polymer layer by preparing a polymer layer with a thickness greater than that of the substrate layer on the fabric substrate layer, thereby avoiding affecting the flatness of the surface of the release material, making the surface morphology of the polymer layer more controllable, and can prepare a release material with a flat surface or a release material with specific textures on the surface according to specific use requirements. In addition, the number of times the release material is used is increased, and the service life of the release material is increased.

[0022] The process of laminating first and then foaming in the present application improves the bonding strength between the polymer layer and the substrate layer, and prevents the release material from separating itself during release. By selecting the same material and the opposite material of the polymer precursor, release materials with different release forces can be prepared according to different needs.

[0023] The release material prepared by the preparation process of the present application has the performance of multiple releases, the release force can be designed according to specific needs, the service life is long, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the release material described in the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the release material of the present invention.

[0026] Wherein: 10 - fabric substrate layer, 15 - surface of fabric substrate layer, 20 - polymer material layer, 21 - first surface. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] As used herein, "one embodiment" or "embodiment" refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. The content of the present invention may be more easily understood by referring to the following detailed description of the preferred implementation method of the present invention and the included embodiments. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. In the event of a conflict, the definitions in this specification shall prevail.

[0029] For the following defined terms, these definitions shall apply unless a different definition is given in the claims or elsewhere in this specification. All numerical values, whether or not explicitly indicated, are defined herein as modified by the term "about". The term "about" generally refers to a numerical range that a person of ordinary skill in the art considers to be equivalent to the stated values ​​to produce substantially the same properties, functions, results, etc. A numerical range indicated by a lower value and a higher value is defined to include all numerical values ​​included in the numerical range and all subranges included in the numerical range.

[0030] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0031] When a numerical range is disclosed herein, the above range is deemed to be continuous and includes the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. For example, a specified range from "1 to 10" should be deemed to include any and all sub-ranges between a minimum of 1 and a maximum of 10. Exemplary sub-ranges of ranges 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0034] Polar materials: refers to organic substances with unbalanced molecular charge distribution, such as PVC, NBR and other materials.

[0035] Non-polar materials: refers to organic matter with relatively uniform molecular charge distribution, such as SBR, PE, EVA, TPE and other materials.

[0036] The following is an introduction to a release material provided in an embodiment of the present application, comprising a fabric substrate layer 10 and a polymer material layer 20 located on the fabric substrate layer, wherein the polymer material layer 20 has release properties, and the thickness of the polymer material layer 20 is greater than the thickness of the fabric substrate layer 10. The polymer material layer 20 is sticky, and the stickiness can determine whether the release material is easy to be peeled off during use. The polymer material layer 20 has a certain thickness, which increases the number of release times of the release material of the present application, can reduce the loss of release force after multiple peelings, and has better release properties; it can also prevent the texture of the fabric substrate layer 10 from being copied to the surface of the polymer layer, avoiding affecting the flatness of the surface of the release material.

[0037] In some embodiments, the polymer material layer 20 can be provided with different thicknesses at different locations according to different requirements. The thickness of the polymer material layer 20 is 2 to 4 times the thickness of the fabric substrate layer 10. Specifically, the thickness of the polymer material layer 20 is 2, 2.5, 3, 3.6, or 4 times the thickness of the fabric substrate layer 10.

[0038] In the present application, a polymer material layer is coated on the surface 15 of the fabric substrate layer to obtain a release film; a foaming material precursor is provided, the release film and the foaming material precursor are pressed together, and then foaming is performed to obtain the release material of the present application.

[0039] In some embodiments, the foaming material precursor may be semi-cured rubber or plastic.

[0040] Among them, semi-mature rubber or plastic refers to a material state between completely unprocessed (raw rubber or raw material) and the final product. This state includes the following situations:

[0041] Primary processing: The rubber or plastic may have undergone initial physical or chemical treatment, but has not yet completed the entire production process. This includes preliminary processing steps such as extrusion, calendering, mixing, and extrusion;

[0042] Incomplete Curing or Polymerization: Material may have partially cured or polymerized but has not yet been fully completed to achieve its final hardness, strength, or chemical stability.

[0043] Not Yet in End Use: In a semi-finished state, the rubber or plastic may not yet have been made into a final product or part. It may still be in a semi-finished state, awaiting subsequent manufacturing or processing steps.

[0044] May require further processing: These materials may need to be further processed, formed, matured or cured in subsequent steps to meet specific performance requirements.

[0045] In addition, the polymer material layer is a composite material with pores. In some embodiments, polar or non-polar monomers can be filled into the polymer material layer. Polar and / or non-polar monomers are filled into the composite material. When heterogeneous materials are used, the release force of the release material surface can be increased by the interaction between the polar monomers and / or non-polar monomers.

[0046] Since the substrate layer 10 of the release material is made of a fabric substrate, such as a breathable mesh or elastic fabric, a breathable environment is provided for the foaming reaction; on the other hand, when preparing the release material, the different selected agents can penetrate the surface 15 of the fabric substrate layer, enter the polymer material layer, participate in the foaming reaction of the polymer material, and improve the utilization rate of the agent. The release force is controlled by the interaction between the polar monomer and the non-polar monomer. For example, opposite polarity can increase the release force, while the same polarity can reduce the release force. Therefore, the release film made by the above-mentioned method of the present application can provide different release forces, which determines whether the release film is easy to be peeled off from the surface of the foaming material.

[0047] In addition, the present application can also prepare a flat surface or a surface with preset patterns on the first surface 21 of the polymer material layer to meet the needs of different use environments. In some embodiments, the flat surface refers to a surface without patterns, and the preset patterns can be two-way continuous patterns and / or four-way continuous patterns, such as patterns formed by embossing the surface of the polymer material layer in advance.

[0048] When the release film and the foaming material precursor are pressed together, the bonding strength between the foaming precursor and the substrate layer is improved, preventing the release material from separating when the final product is released. Since the thickness of the polymer material layer 20 is greater than the thickness of the fabric substrate layer 10, the texture of the fabric substrate layer will not be copied to the surface of the foaming material precursor, so that the prepared release material polymer material layer can obtain a flat surface. Or the polymer material layer is controlled to have different thicknesses in different parts, and a customized texture is formed on the surface of the foaming material precursor through a foaming reaction. Surfaces with different thicknesses or preset textures can be designed according to different needs.

[0049] In some embodiments, the foaming precursor includes one or more of silicone, fluororubber, polyvinyl chloride, nitrile rubber, styrene-butadiene rubber, polyethylene, ethylene-vinyl acetate copolymer and thermoplastic elastomer. The release agent layer may be, but is not limited to, silicone or fluororubber.

[0050] In addition, at least one or more of dispersants, stabilizers, solubilizers, emulsifiers, surfactants, antioxidants, anti-adhesive agents and antibacterial agents may be added to the foaming precursor to provide different release forces or prepare different patterns.

[0051] Specifically, the effects of different agents are as follows:

[0052] The dispersant is used to improve the dispersibility of the particles or granular fillers in the foaming material precursor to ensure that they are evenly distributed in the foaming material precursor. The specific reagent can be a non-ionic surfactant such as polyvinyl alcohol, a cationic surfactant such as hexadecyltrimethylammonium bromide, etc., a polymer dispersant such as sodium polyacrylate (PAA) or polyvinyl alcohol (PVA), and a solvent such as water or an organic solvent. In other embodiments, ultrasonic treatment or mechanical stirring or the addition of a chemical modifier can also be used to improve the dispersibility of the particles or granular fillers in the precursor.

[0053] The stabilizer is used to enhance the stability of the foaming material precursor to prevent stratification or precipitation during storage or use. The specific reagents may be, but are not limited to, antioxidants such as phenolic antioxidants BHT (butylated hydroxytoluene) or phosphate antioxidants, chelating agents such as EDTA (ethylenediaminetetraacetic acid), acid-base stabilizers, and antibacterial agents.

[0054] The solubilizer is used to improve the compatibility between the components in the foaming material precursor and help dissolve or disperse the insoluble components. The specific reagent can be, but is not limited to, an organic solvent such as toluene, xylene, ethyl acetate, etc., a polymer solubilizer such as polyvinyl alcohol (PVA), or a miscible solvent such as NMP (N-methylpyrrolidone), or a temperature regulator to change the phase state of the substance and help mix the insoluble components.

[0055] Emulsifiers are used to promote the emulsification of immiscible liquids such as water and oil in the foaming material precursor, and improve the miscibility and stability. The specific reagents can be, but are not limited to, non-ionic surfactants such as polyvinyl alcohol, cationic surfactants such as hexadecyltrimethylammonium bromide, biological emulsifiers such as proteins or polysaccharides, polymer emulsifiers such as latex polymers or polyolefins, etc., microemulsifiers or miscible solvents.

[0056] Surfactants are used to reduce the surface tension of the foaming material precursor and improve its wettability and coverage on the substrate. The specific agent can be, but is not limited to, non-ionic surfactants such as polyoxyethylene ether surfactants, cationic surfactants, ionic surfactants, polymer surfactants, silane coupling agents, or surface modifiers.

[0057] Antioxidants are used to protect the foaming material precursor from oxidation and aging, and extend its service life. The specific agents can be, but are not limited to, phenolic antioxidants such as BHT (butylated hydroxytoluene), BHA (butylated hydroxybenzoic acid) and TBHQ (tert-butyl-p-benzoquinone), phosphate antioxidants such as TPP (triphenyl phosphate) and TPPO (triphenoxy phosphate), phenolic antioxidants such as katin (2,4-dimethyl-6-tert-butylphenol) and ibukaninin (2,2'-methylenebis(4-methylphenyl-6-propanone)phenol).

[0058] The anti-adhesive agent is used to reduce the adhesion between the foaming material precursor and the surrounding environment or other materials to facilitate removal or separation. The specific agent can be but not limited to silicone oil, wax, polytetrafluoroethylene (PTFE) and other substances, silane coupling agent, powder release agent or anti-adhesive film.

[0059] Antimicrobial agents are used to prevent mold or bacteria from growing in the foaming material precursor in a humid environment to maintain its quality and hygiene. The specific agent can be, but is not limited to, an antimicrobial agent such as an isoxazole compound (e.g., metronidazole) or isopropyl paraben (IPBC), a copper salt such as copper cobalt sulfate or copper zinc sulfate, an organic preservative such as isopropylparaben and methylparaben, an acid-base regulator, or an organic silver compound such as silver carbonate or silver nitrate.

[0060] By using the above-mentioned agents, the foaming reaction of the present application can be designed according to different usage requirements, and a polymer material layer with different surface properties can be prepared.

[0061] In some embodiments, during the lamination step, when the release film is airtight, gas can be filled between the release film and the foaming material precursor by inflation or vacuum extraction to control the amount of gas entering the bonding area, increase the depressions formed by the surface gas, and produce a rock-like texture.

[0062] In some embodiments, the pressing method can be performed by pressing with external force. For example, in the pressing step, a single or multiple film-molding pressing wheels can be used, and the textured surface of the film-molding pressing wheel contacts the foaming material precursor, so that the foamed foamed material has a surface with deep textures after foaming, so as to reduce the subsequent process steps, and at least two or more textures can be simultaneously presented on the first surface 21 of the polymer material layer. Specifically, according to different needs, the pressing force and pressing method of different parts of the foaming precursor are controlled to prepare polymer material layers with different thicknesses.

[0063] The above disclosure is only the preferred embodiment of the present application. It should be pointed out that any changes made by technicians familiar with the field to the specific implementation of the present application do not deviate from the scope of the claims of the present application. Accordingly, the scope of the claims of the present application is not limited to the aforementioned specific implementation.

Claims

1. A release material, characterized in that: The release material comprises a fabric substrate layer (10) and a polymer material layer (20) located on the fabric substrate layer; The polymer material layer (20) has release properties, and the thickness of the polymer material layer (20) is greater than the thickness of the fabric substrate layer (10).

2. The release material according to claim 1, characterized in that: The thickness of the polymer material layer (20) is 2 to 4 times the thickness of the fabric substrate layer (10).

3. The release material according to claim 1, characterized in that: The polymer material layer (20) has pores therein.

4. A method for forming a release material according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: S1: coating a polymer material having release properties on the surface (15) of the fabric substrate layer to obtain a release film; S2: adding a foaming material precursor onto the release film, pressing the release film and the foaming material precursor together to perform a foaming reaction to obtain the release material.

5. The forming method according to claim 4, characterized in that: The polymer material in S1 includes one or more polar materials or non-polar materials.

6. The forming method according to claim 4, characterized in that: The polar material includes one or more of PVC and NBR, and the non-polar material includes one or more of SBR, PE, EVA and TPE.

7. The forming method according to claim 4, characterized in that: One or more of a dispersant, a stabilizer, a solubilizer, an emulsifier, a surfactant, an antioxidant, an anti-adhesive agent and an antibacterial agent may be incorporated into the S1 polymer material.

8. The forming method according to claim 4, characterized in that: In the pressing step in S2, gas is filled between the release film and the foaming material precursor.

9. The forming method according to claim 4, characterized in that: The pressing comprises pressing with a film-molding pressing wheel.

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