High-temperature-resistant transparent adhesive tape

Abstract

The utility model provides a kind of high-temperature-resistant transparent adhesive tape.The high-temperature-resistant transparent adhesive tape includes base cloth layer, passivation layer and adhesive layer arranged in sequence;The base cloth layer includes glass fiber cloth layer and PFA film layer;The PFA film layer is embedded in the both sides of glass fiber cloth layer.The utility model has excellent high-temperature resistance and transparency while maintaining good mechanical properties and initial adhesion, is practical, and has a wide range of applications.

Description

Technical Field

[0001] This utility model belongs to the field of adhesive tape technology, specifically relating to a high-temperature resistant transparent adhesive tape. Background Technology

[0002] Transparent tape is widely used in daily life due to its transparency. However, most transparent tapes currently on the market are made of polypropylene (PP), polyethylene terephthalate (PET), or thermoplastic polyurethanes (TPU), all of which have poor temperature resistance (below 200℃), limiting their application to some extent. Industrially used high-temperature resistant tapes are mostly made of polytetrafluoroethylene (PTFE), which offers improved temperature resistance compared to ordinary tapes. However, due to the material and processing characteristics of PTFE, it can only be used as a high-temperature insulating tape and cannot achieve transparency.

[0003] Therefore, it is of great significance to design and provide an adhesive tape that maintains good mechanical properties and initial tack while also having excellent high-temperature resistance and transparency. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a high-temperature resistant transparent tape. While maintaining good mechanical properties and initial tack, it also possesses excellent high-temperature resistance and transparency, making it suitable for a wide range of applications.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a high-temperature resistant transparent tape, which includes a base fabric layer, a passivation layer and an adhesive layer arranged sequentially.

[0007] The base fabric layer includes a glass fiber cloth layer and a PFA film layer; the PFA film layer is embedded on both sides of the glass fiber cloth layer.

[0008] The specific configuration of the base fabric layer in this high-temperature resistant transparent tape can improve the high-temperature resistance and transparency of the resulting tape. The passivation layer can strengthen the bonding strength between the base fabric layer and the adhesive layer. The adhesive layer is used to improve the initial tack performance of the tape. Through the cooperation of the three layers, the resulting tape can maintain good mechanical properties and initial tack performance while also having excellent high-temperature resistance and transparency. It is highly practical and has a wide range of applications.

[0009] The high-temperature resistant transparent tape possesses excellent thermal stability, capable of withstanding the high temperature of 260℃ baking processes without deterioration; its transparency facilitates observation of the adhered object or markings, simplifying operation; at the same time, it also has advantages such as electrical insulation, flame retardancy, or chemical resistance, providing innovative technical solutions for high-temperature applications in the electronics, automotive, and industrial manufacturing fields.

[0010] In this invention, the glass fiber cloth layer provides a certain strength, and the PFA (perfluoroalkoxy alkane) film layer is soluble polytetrafluoroethylene, which is prepared by melt extrusion casting. The arrangement of embedding the PFA film layer on both sides of the glass fiber cloth layer enables the PFA film layer and the glass fiber cloth layer to be better combined and composited, so that the two can play a better role, thereby obtaining a high-temperature resistant transparent tape with better comprehensive properties such as mechanical properties, temperature resistance, and transparency.

[0011] It should be noted that the material in the PFA thin film layer is a material known in the prior art, for example, the content disclosed in CN103522552A can be referred to.

[0012] It should be noted that the high temperature resistance in this utility model refers to the absence of significant deterioration after 12 hours in an environment of 260℃.

[0013] The following are preferred technical solutions of this utility model, but are not intended to limit the technical solutions provided by this utility model. Through the following preferred technical solutions, the purpose and beneficial effects of this utility model can be better achieved.

[0014] Preferably, the thickness of the high-temperature resistant transparent tape is 0.06-0.2mm, for example, it can be 0.06mm, 0.08mm, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm or 0.2mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range.

[0015] Preferably, the areal density of the high-temperature resistant transparent tape is 104.3-347.3 g / m³. 2 For example, it could be 104.3 g / m³ 2 120g / m 2 150g / m 2 180g / m 2 200g / m 2 230g / m 2 250g / m 2 280g / m 2 300g / m 2320g / m 2 Or 347.3g / m 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0016] Preferably, the thickness of the base fabric layer is 50-130μm, for example, it can be 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm or 130μm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range. More preferably, it is 70-130μm, and even more preferably, it is 70-100μm.

[0017] This invention optimizes the thickness of the base fabric layer, enabling the resulting tape to possess both high-temperature resistance and more suitable mechanical properties and transparency. Within a certain thickness range (50-130μm), as the thickness of the base fabric layer increases, its tensile strength improves, but its light transmittance decreases significantly. When the thickness reaches a certain value (130μm), further increasing the thickness of the base fabric layer, while improving the tensile strength, is limited and instead leads to a decrease in light transmittance. This not only increases production costs but also, due to the increased rigidity caused by the increased thickness, reduces flexibility and bonding strength, thus reducing the ease of use of the resulting high-temperature resistant transparent tape, which is detrimental to practical production applications. Conversely, when the thickness is too low, the tensile strength of the product is too low, making it easily torn and impractical.

[0018] Furthermore, the thickness of the base fabric layer in this invention can be adaptively selected and adjusted according to the actual production needs. When it is between 70-100μm, the mechanical properties and transparency of the resulting high-temperature resistant transparent tape can achieve a good balance, that is, the overall performance is optimal.

[0019] Preferably, the thickness of the glass fiber cloth layer is 19-95μm, for example, it can be 19μm, 25μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 95μm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range.

[0020] Preferably, the areal density of the glass fiber cloth layer is 19.5-104.5 g / m³. 2 For example, it can be 19.5g / m 2 30g / m 2 40g / m 2 50g / m 2 60g / m2 70g / m 2 80g / m 2 90g / m 2 100g / m 2 Or 104.5g / m 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0021] Preferably, the glass fiber cloth layer comprises a plain-weave glass fiber cloth layer.

[0022] Preferably, the areal density of the PFA film layer is 60-200 g / m³. 2 For example, it can be 60g / m 2 80g / m 2 100g / m 2 120g / m 2 140g / m 2 160g / m 2 180g / m 2 Or 200g / m 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0023] As a preferred embodiment of this utility model, the PFA film layer includes a colored PFA film layer, and the material in the colored PFA film layer includes a color masterbatch, which is a material known in the prior art, for example, as disclosed in CN107163460A. This enables the present utility model to prepare high-temperature resistant transparent tapes of different colors.

[0024] Preferably, the passivation layer comprises a nano-silica passivation layer.

[0025] In this invention, the nano-silica passivation layer enables the formation of a passivation coating (nano-silica / PFA passivation layer) on the surface of the PFA film layer. The nano-silica is first blended with the PFA emulsion, and then the water in the PFA emulsion is evaporated by high temperature. The PFA and silica nanoparticles remain on the surface of the PFA film layer. Through high-temperature melting treatment, the nano-silica particles are fused to the surface of the PFA film layer, which improves the bonding between the nano-silica and the PFA film. In addition, the nano-silica particles exposed on the surface of the PFA film layer can increase the surface roughness of the PFA film layer, thereby producing a good passivation effect, which is beneficial to the bonding and composite of the PFA film layer and the adhesive layer.

[0026] Preferably, the thickness of the passivation layer is 100-1000nm, for example, it can be 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm or 1000nm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range.

[0027] Preferably, the areal density of the passivation layer is 1-5 g / m³. 2 For example, it can be 1g / m 2 1.5g / m 2 2g / m 2 2.5g / m 2 3g / m 2 3.5g / m 2 4g / m 2 4.5g / m 2 or 5g / m 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0028] Preferably, the adhesive layer comprises a base layer and an organosilicon pressure-sensitive adhesive layer; the base layer is disposed on the side close to the passivation layer.

[0029] Preferably, the thickness of the base coating is 2-10 μm, for example, it can be 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range.

[0030] Preferably, the base coating comprises an adhesive accelerator coating.

[0031] Preferably, the adhesive accelerator in the adhesive accelerator coating comprises silicone rubber.

[0032] Preferably, the thickness of the silicone pressure-sensitive adhesive layer is 20-70 μm, for example, it can be 20 μm, 30 μm, 40 μm, 50 μm, 60 μm or 70 μm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific values ​​included in the range.

[0033] In the high-temperature resistant transparent tape provided by this utility model, within a certain range, as the thickness of the silicone pressure-sensitive adhesive layer increases, its adhesive performance is significantly improved, and its tensile strength also increases.

[0034] Preferably, the silicone pressure-sensitive adhesive layer comprises a silicone adhesive layer.

[0035] In this invention, there are no special limitations on the preparation method of the high-temperature resistant transparent tape. Exemplarily, the preparation method of the high-temperature resistant transparent tape includes:

[0036] A base fabric layer is obtained by calendering and drawing a glass fiber cloth layer and a PFA film layer obtained by melt casting at a high temperature (350°C). One side of the base fabric layer is then passivated (by impregnating it with PFA nano-silica emulsion at 350°C using an impregnation device) to obtain a nano-silica passivation layer. Subsequently, a base coating layer and an organosilicon pressure-sensitive adhesive layer are sequentially coated to obtain the high-temperature resistant transparent tape.

[0037] It should be noted that there are no special limitations on the specific processing method of melt casting in this utility model, and conventional processing methods in this field are applicable.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This invention provides a high-temperature resistant transparent tape with a thickness of 0.06-0.2 mm and an areal density of 104.3-347.3 g / m³. 2 While maintaining good mechanical properties (breaking strength of 387-1583 N / 50 mm) and initial tack (653-1239 gf / 24 mm), it also has excellent high temperature resistance (temperature resistance of 260℃) and transparency (light transmittance of ≥70%), making it highly practical and widely applicable. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the high-temperature resistant transparent tape provided in Example 1;

[0041] Among them, 1-base fabric layer, 2-passivation layer, 3-adhesive layer, 4-base coating layer, and 5-organic silicone pressure-sensitive adhesive layer. Detailed Implementation

[0042] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0043] Unless otherwise specified, the materials used in the embodiments and comparative examples of this utility model are all commercially available products.

[0044] Example 1

[0045] This embodiment provides a high-temperature resistant transparent tape, the structural diagram of which is shown below. Figure 1As shown, the high-temperature resistant transparent tape comprises a base fabric layer, a nano-silica passivation layer, a base coating layer, and an organosilicon pressure-sensitive adhesive layer arranged sequentially. The high-temperature resistant transparent tape has a thickness of 125.5 μm and an areal density of 210 g / m³. 2 .

[0046] The thickness of the base fabric layer is 72 μm (the surface density of the glass fiber cloth is 48.5 g / m²). 2 The thickness is 45 μm; the PFA film layer density is 110 g / m². 2 );

[0047] The thickness of the nano-silica passivation layer is 500 nm;

[0048] The thickness of the base coating is 8μm, and the material is silicone rubber;

[0049] The thickness of the silicone pressure-sensitive adhesive layer is 45μm, and the material is silicone adhesive.

[0050] The preparation method of the high-temperature resistant transparent tape is as follows:

[0051] A glass fiber cloth layer and a PFA film layer obtained by melt casting are calendered and drawn at a high temperature (350°C) to obtain a base cloth layer. One side of the base cloth layer is passivated (using an impregnation device, impregnating PFA emulsion and nano-silica, and performing passivation treatment at 350°C) to obtain a nano-silica passivation layer. Then, a base coating layer and an organosilicon pressure-sensitive adhesive layer are coated in sequence to obtain the high-temperature resistant transparent tape.

[0052] Example 2

[0053] This embodiment provides a high-temperature resistant transparent tape, which includes a base fabric layer, a nano-silica passivation layer, a base coating layer, and an organosilicon pressure-sensitive adhesive layer arranged sequentially. The high-temperature resistant transparent tape has a thickness of 70.2 μm and an areal density of 104.3 g / m³. 2 .

[0054] The thickness of the base fabric layer is 50 μm (the surface density of the glass fiber fabric is 19.5 g / m²). 2 The thickness is 19 μm; the PFA film layer density is 60 g / m². 2 );

[0055] The thickness of the nano-silica passivation layer is 200 nm;

[0056] The thickness of the base coating is 5μm, and the material is silicone rubber;

[0057] The thickness of the silicone pressure-sensitive adhesive layer is 15μm, and the material is silicone adhesive.

[0058] The preparation method of the high-temperature resistant transparent tape is as follows:

[0059] A glass fiber cloth layer and a PFA film layer obtained by melt casting are calendered and drawn at a high temperature (350°C) to obtain a base cloth layer. One side of the base cloth layer is passivated (using an impregnation device, impregnating PFA emulsion and nano-silica, and performing passivation treatment at 350°C) to obtain a nano-silica passivation layer. Then, a base coating layer and an organosilicon pressure-sensitive adhesive layer are coated in sequence to obtain the high-temperature resistant transparent tape.

[0060] Example 3

[0061] This embodiment provides a high-temperature resistant transparent tape, which includes a base fabric layer, a nano-silica passivation layer, a base coating layer, and an organosilicon pressure-sensitive adhesive layer arranged sequentially. The high-temperature resistant transparent tape has a thickness of 176 μm and an areal density of 260 g / m³. 2 .

[0062] The thickness of the base fabric layer is 95 μm (the surface density of the glass fiber cloth is 58 g / m²). 2 The thickness is 60 μm; the PFA film layer density is 100 g / m². 2 );

[0063] The thickness of the nano-silica passivation layer is 1000 nm;

[0064] The thickness of the base coating is 10 μm, and the material is silicone rubber;

[0065] The thickness of the silicone pressure-sensitive adhesive layer is 70 μm, and the material is silicone adhesive.

[0066] The preparation method of the high-temperature resistant transparent tape is as follows:

[0067] A glass fiber cloth layer and a PFA film layer obtained by melt casting are calendered and drawn at a high temperature (350°C) to obtain a base cloth layer. One side of the base cloth layer is passivated (using an impregnation device, impregnating PFA emulsion and nano-silica, and performing passivation treatment at 350°C) to obtain a nano-silica passivation layer. Then, a base coating layer and an organosilicon pressure-sensitive adhesive layer are coated in sequence to obtain the high-temperature resistant transparent tape.

[0068] Example 4

[0069] This embodiment provides a high-temperature resistant transparent tape, which includes a base fabric layer, a nano-silica passivation layer, a base coating layer, and an organosilicon pressure-sensitive adhesive layer arranged sequentially. The high-temperature resistant transparent tape has a thickness of 147.3 μm and an areal density of 347.5 g / m³. 2 .

[0070] The thickness of the base fabric layer is 125 μm (the surface density of the glass fiber cloth is 104.5 g / m²). 2 The thickness is 95 μm; the PFA film layer density is 200 g / m². 2 );

[0071] The thickness of the nano-silica passivation layer is 300 nm;

[0072] The thickness of the base coating is 2μm, and the material is silicone rubber;

[0073] The thickness of the silicone pressure-sensitive adhesive layer is 20 μm, and the material is silicone adhesive.

[0074] The preparation method of the high-temperature resistant transparent tape is as follows:

[0075] A glass fiber cloth layer and a PFA film layer obtained by melt casting are calendered and drawn at a high temperature (350°C) to obtain a base cloth layer. One side of the base cloth layer is passivated (using an impregnation device, impregnating PFA emulsion and nano-silica, and performing passivation treatment at 350°C) to obtain a nano-silica passivation layer. Then, a base coating layer and an organosilicon pressure-sensitive adhesive layer are coated in sequence to obtain the high-temperature resistant transparent tape.

[0076] Example 5

[0077] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 40μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0078] Example 6

[0079] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 50μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0080] Example 7

[0081] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 60μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0082] Example 8

[0083] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 100μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0084] Example 9

[0085] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 130μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0086] Example 10

[0087] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the base fabric layer is adjusted from 72μm to 140μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0088] Example 11

[0089] This embodiment provides a high-temperature resistant transparent tape, which differs from Embodiment 1 only in that the thickness of the silicone pressure-sensitive adhesive coating is adjusted from 45μm to 70μm, while the selection and thickness of other layers are the same as in Embodiment 1.

[0090] Comparative Example 1

[0091] This comparative example provides an adhesive tape that differs from Example 1 only in that the PFA film layer is replaced with a PTFE film layer, while the selection and thickness of the other layers are the same as in Example 1.

[0092] Comparative Example 2

[0093] This comparative example provides an adhesive tape that differs from Example 1 only in that it does not have a passivation layer, while the selection and thickness of the other layers are the same as in Example 1.

[0094] The tapes obtained in Examples 1-11 and Comparative Examples 1-2 were subjected to performance tests, and the test methods / standards are as follows:

[0095] (1) Temperature resistance: If the tape is pasted on a stainless steel plate and left at 260℃ for 6 hours, it is considered qualified if there is no melting, aging or delamination.

[0096] (2) Transmittance: The transmittance in the wavelength range of 380-780nm was measured using a spectrophotometer;

[0097] (3) Breaking strength: Refer to GB / T 3923.1-2013 Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break (strip method);

[0098] (4) Initial tack performance: Refer to the test method for peel strength of adhesive tape in GB / T 2792-2014.

[0099] The test results are shown in Table 1.

[0100] Table 1

[0101] Example 1 751 987 qualified 87 Example 2 510 653 qualified 92 Example 3 1137 1239 qualified 81 Example 4 1096 682 qualified 82 Example 5 387 961 qualified 91 Example 6 453 974 qualified 90 Example 7 526 959 qualified 89 Example 8 1392 977 qualified 76 Example 9 1534 992 qualified 72 Example 10 1583 981 qualified 70 Example 11 784 1151 qualified 85 Comparative Example 1 584 971 qualified 31 Comparative Example 2 775 583 Unqualified 86

[0102] The test results show that:

[0103] (1) As can be seen from Examples 1 to 9, the present invention, through the combination of a specific base fabric layer, passivation layer and adhesive layer, enables the obtained tape to maintain good mechanical properties and initial tack while also having excellent high temperature resistance and transparency. The tensile strength is 387-1583 N / 50 mm, the initial tack is 653-1239 gf / 24 mm, the temperature resistance is qualified, and the light transmittance is ≥70%.

[0104] (2) As can be seen from Examples 1 and 5-10, compared with Examples 6-9, the breaking strength in Example 5 is significantly reduced, and although the breaking strength in Example 10 is improved, its light transmittance is only 70%. Furthermore, compared with Examples 6 and 9, the high-temperature resistant transparent tapes obtained in Examples 1, 7 and 8 have good light transmittance while maintaining good breaking strength, and their overall performance is better. This shows that by optimizing the thickness of the base fabric layer, the mechanical properties and transparency of the obtained high-temperature resistant transparent tape can achieve a better balance, that is, the overall performance is better.

[0105] (3) By comparing Example 1 with Comparative Examples 1 and 2, it can be seen that by making specific settings for the base fabric layer and passivation layer of the tape, the present invention can enable the layers to cooperate better, thereby making the high temperature resistant transparent tape maintain good mechanical properties and initial tack properties while also having excellent high temperature resistance and transparency, resulting in excellent overall performance.

[0106] The applicant declares that the detailed structural features of this utility model are illustrated through the above embodiments, but this utility model is not limited to the above detailed structural features, that is, it does not mean that this utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions of selected components, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this utility model.

Claims

1. A high-temperature resistant transparent tape, characterized in that, The high-temperature resistant transparent tape comprises a base fabric layer, a passivation layer, and an adhesive layer arranged sequentially. The base fabric layer includes a glass fiber cloth layer and a PFA film layer; the PFA film layer is embedded on both sides of the glass fiber cloth layer.

2. The high-temperature resistant transparent tape according to claim 1, characterized in that, The thickness of the high-temperature resistant transparent tape is 0.06-0.2 mm.

3. The high-temperature resistant transparent tape according to claim 1, characterized in that, The thickness of the base fabric layer is 50-130 μm.

4. The high-temperature resistant transparent tape according to claim 1, characterized in that, The thickness of the glass fiber cloth layer is 19-95 μm.

5. The high-temperature resistant transparent tape according to claim 1, characterized in that, The fiberglass cloth layer includes a plain weave fiberglass cloth layer.

6. The high-temperature resistant transparent tape according to claim 1 or 2, characterized in that, The passivation layer has a thickness of 100-1000 nm; the passivation layer includes a nano-silicon dioxide passivation layer.

7. The high-temperature resistant transparent tape according to claim 1 or 2, characterized in that, The adhesive layer includes a base layer and an organosilicon pressure-sensitive adhesive layer; the base layer is disposed on the side close to the passivation layer.

8. The high-temperature resistant transparent tape according to claim 7, characterized in that, The thickness of the base coating is 2-10 μm.

9. The high-temperature resistant transparent tape according to claim 7, characterized in that, The thickness of the silicone pressure-sensitive adhesive layer is 20-70 μm.

10. The high-temperature resistant transparent tape according to claim 7, characterized in that, The silicone pressure-sensitive adhesive layer includes a silicone adhesive layer.

Images