CN115093800A - TPU double-sided adhesive tape with rubber reinforced film and preparation method thereof - Google Patents

Abstract

The invention provides a TPU double-sided tape with a rubber reinforced film and a preparation method thereof. The preparation method comprises the following steps: (A) making a TPU base layer; (B) making a rubber reinforced film, and coating the rubber reinforced film cloth on the surface of the TPU base layer; (C) make a silicone layer, and coat the silica gel layer on the surface of the rubber reinforced film; (D) make an acrylic layer, and coat the acrylic layer on the other surface of the TPU base layer. The application also provides a TPU double-sided tape with a rubber reinforced film, the double-sided tape includes a TPU base layer, and the two surfaces of the TPU base layer are respectively covered with a rubber reinforced film and an acrylic layer, and the rubber reinforced The surface of the membrane is covered with a silica gel layer, and the surfaces of the silica gel layer and the acrylic layer are respectively covered with a release material.

Description

A kind of TPU double-sided tape with rubber reinforced film and preparation method thereof

technical field

The invention relates to the field of double-sided tape, in particular to a TPU double-sided tape with a rubber reinforced film and a preparation method thereof.

Background technique

The descriptions in this section merely provide background information related to the present disclosure and do not constitute prior art.

As consumer electronic products become increasingly wearable, the hardware of smart watches, wristbands, and emerging VR devices (including headsets, wristbands, handheld handles, etc.) The overall weight is lighter, and it is designed in the direction of maintaining the power for a longer time. Among them, in addition to hardness and touch, the skin-friendly material also has hygiene and health considerations such as whether it can be as waterproof as possible, not sticking to oil, and not accumulating dust. Therefore, some loose, porous, light-weight, and better-quality products are used in places that are in contact with human skin for a long time, such as smart watches, wristbands, VR headset headbands, and foam pads on wristbands. It is chemically inert and has low surface energy, so it can be made of silicone rubber or TPU material that does not touch water, oil and dust.

Therefore, it is difficult to bond and fix these low surface energy materials with conventional glues or tapes when assembling electronic devices, because these external materials usually need to be fixed with the internal structural frame or electronic components, and a single-material glue ( It is difficult to bond and fix low surface energy materials and common various plastics such as PC, PS and other materials at the same time. At the same time, because most of these skin-friendly materials are lightweight, porous, and elastic After assembly, most of them need to be kept stretched and bent because they need to fit the contours of the human body, which also increases the difficulty of firm and fit bonding. In addition, due to long-term wear, the bonding of these materials will also be affected by or from external conditions (such as outdoor direct sunlight) and the heat caused by the continuous operation of the machine, which requires a certain tolerance to the environment. In addition, daily life has relatively high requirements on the toughness and elasticity of TPU double-sided tape.

It should be noted that the above description of the technical background is only for the convenience of clearly and completely describing the technical solutions of the present invention and facilitating the understanding of those skilled in the art. It should not be assumed that the above-mentioned technical solutions are well known to those skilled in the art simply because these solutions are described in the background section of the present invention.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a TPU double-sided tape with a rubber reinforced film and a preparation method thereof. The double-sided tape is designed to add a layer of rubber material reinforced film on the TPU base material, which can improve the double-sided tape. Toughness and elasticity.

In order to solve the above-mentioned technical problems, the present invention provides a preparation method of a TPU double-sided tape with a rubber reinforced film, the preparation method comprises the following steps, (A) making a TPU base layer; (B) making a rubber reinforced film, and The rubber reinforced film is coated on the surface of the TPU base layer; (C) a silicone layer is made, and the silica gel layer is coated on the surface of the rubber reinforced film; (D) an acrylic layer is made, and the acrylic layer is coated on the other side of the TPU base layer. a surface.

Preferably, preferably, step (A) comprises, taking 8-10 parts by mass of TPU particles, using 18-22 parts by mass of toluene and 11-18 parts by mass of DMF as solvents to form a TPU mixed solution; Using the release material as a support base, the TPU mixture is coated on the release material; baking is performed at 50-120° C. to volatilize the solvent to form a TPU base layer. The thickness of the TPU base layer of this application is 40-100um, the solid content is about 25-35%, the material modulus reaches 30MPa, the elongation at break is 700% to 1000%, and it has excellent elasticity and ductility. After stretching, the stress caused by the different degrees of deformation on both sides of the bond is affected. In addition, this TPU finished product has stable chemical properties and good resistance to ultraviolet and temperature.

Preferably, the step (B) comprises, combining 50-55 parts by mass of a terpene resin with a softening point of 125-140° C. in combination with 15-20 parts by mass of petroleum resin, and the parts by mass of 25-35 SES/SEBS/SIS type rubber resin, add 0.1-0.5 parts by mass of antioxidant to form a mixed solution; bake the mixed solution at 40-120 ℃ to make the solvent volatilize, and put it on the TPU base layer. A rubber-reinforced film is formed on the surface. The overall thickness after lamination is in the range of 50-300um, tensile strength: 5-60MPa, elongation at break: 300%-1000%.

Preferably, the step (C) specifically includes: mixing 6 parts by mass of vinyl-modified MQ resin, 2 parts of 80-1 million molecular weight 101 raw rubber, and 1-30,000 molecular weight terminal vinyl silicone oil 2 parts , using 17 parts by mass of toluene as a solvent, adding 0.2 parts by mass of hydrogen-containing silicone oil, 0.1 part of epoxy modified silicone oil and 0.2 part of 5000ppm platinum catalyst to form a silica gel mixture; The silicone mixture is coated on the rubber reinforced membrane Surface; using the method of gradually heating up, volatilizing the solvent of the silica gel mixture to obtain a silica gel layer covering the surface of the rubber reinforced membrane. The surface adhesion of the silicone layer to the low surface energy material (surface energy dyne value <30) is above 20N/in according to the test standard ASTM D3330. At the same time, due to the high cohesion of silica gel, the silica gel surface can also be repeatedly bonded after being removed after bonding, which meets the needs of repeated positioning in some assembly processes.

Preferably, the method for gradually increasing the temperature in the (C) is as follows: starting from 40-50° C. and gradually raising the temperature to 150-160° C., and the step (C) further comprises, covering the surface of the silica gel layer with a layer of release material.

Preferably, the step (D) is specifically: adding 10 parts by mass of acrylic copolymer to 0.15 part of isocyanate curing agent, and using 12 parts by mass of ethyl acetate and 10 parts by mass of toluene to mix to form Acrylic acid solution; coating the acrylic acid solution on the release material; adopting the method of gradually heating up to volatilize the solvent of the acrylic acid solution to form an acrylic acid layer. The adhesive force of the acrylic layer of the double-sided tape of the present application on the surface of standard 304 stainless steel can reach more than 30N/in according to the test standard ASTM D3330.

Preferably, in the step (D), the method for gradually raising the temperature is specifically, starting from 40 to 50° C., and gradually raising the temperature to 100 to 110° C. The step (D) further comprises: adding step (A) The release material covering the surface of the TPU base layer is removed, and the acrylic layer is attached to the surface of the TPU base layer.

The application also provides a TPU double-sided tape with a rubber reinforced film, the double-sided tape includes a TPU base layer, and two surfaces of the TPU base layer are respectively covered with a rubber reinforced film and an acrylic layer, and the rubber reinforced The surface of the membrane is covered with a silica gel layer, and the surfaces of the silica gel layer and the acrylic layer are respectively covered with a release material.

By the above technical scheme, the beneficial effects of the present invention are as follows:

In the TPU double-sided tape with rubber reinforced film and the preparation method thereof of the present invention, a rubber reinforced film is coated on the surface of the TPU base layer, so that the TPU base material has better flexibility, and the tensile strength of the TPU base material is strengthened. , Acrylic and silica gel are used on both sides of the TPU base layer, which can respectively bond low surface energy materials and conventional materials, which can solve the problem of surface bonding of different materials, and can solve the low surface energy material bonding during the assembly of common electronic products. question.

Description of drawings

1 is a schematic structural diagram of the TPU double-sided tape of the present application.

FIG. 2 is a performance comparison diagram of the TPU base layer of Example 1 of the present application and the TPU base layer not coated with a rubber-reinforced film.

Among them: 1, 6, release material; 2, silicone layer; 3, rubber reinforced film; 4, TPU substrate surface layer; 5, acrylic layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

(A) make TPU base layer: take 7 parts by mass of OH-terminated polyether-type TPU particles, mix 1 part of polyester-type TPU particles, and use 22 parts by mass of toluene and 18 parts by mass of DMF as solvents to form TPU mixture; using the release material as a support base, coating the TPU mixture on the release material; baking at 50-120° C. to volatilize the solvent to form a TPU base layer.

(B) making a rubber reinforced film, and coating the rubber reinforced film on the surface of the TPU base layer: 50 parts by mass of a terpene resin with a softening point of 125° C. combined with 20 parts by mass of petroleum resin, part by mass 35 SES/SEBS/SIS type rubber resins, add 0.1 parts by mass of antioxidants to form a mixed solution; bake the mixed solution at 40°C to volatilize the solvent and form rubber reinforcement on the surface of the TPU base layer membrane.

(C) Making a silica gel layer and coating the silica gel layer on the surface of the rubber reinforced film: mix 6 parts by mass of vinyl modified MQ resin, 2 parts of 80-1 million molecular weight 101 raw rubber, and 1-30,000 parts by mass 2 parts of molecular weight terminal vinyl silicone oil, using 17 parts by mass of toluene as a solvent, adding 0.2 parts by mass of hydrogen-containing silicone oil, 0.1 part of epoxy modified silicone oil and 0.2 part of 5000ppm platinum catalyst to form a silica gel mixture; It is coated on the surface of the rubber reinforced film; the method of gradually heating up is used to volatilize the solvent of the silica gel mixture to obtain a silica gel layer covering the surface of the rubber reinforced film. 150° C., the step (C) further includes, covering the surface of the silica gel layer with a layer of release material.

(D) make an acrylic layer, and coat the acrylic layer on another table of the TPU base layer: add 0.15 parts of isocyanate curing agent to the acrylic copolymer of 10 parts by mass, use 12 parts by mass of ethyl acetate and parts by mass Several 10 parts of toluene are mixed to form an acrylic acid solution; the acrylic acid solution is coated on the release material; a gradual heating method is used to volatilize the solvent of the acrylic acid solution to form an acrylic acid layer, and the method for gradually heating up is as follows: 40°C is the starting point and gradually rises to 100°C. The step (D) further includes removing the release material covering the surface of the TPU base layer in step (A), and attaching the acrylic layer to the surface of the TPU base layer.

As shown in Figure 2, the performance comparison diagram of the TPU base layer of the present embodiment and the TPU base layer without the rubber reinforced film coating, compared with the conventional TPU base material, the TPU composite base material with the rubber reinforced layer added in the present application is obvious as a whole. Have better toughness and elasticity.

Example 2

(A) make TPU base layer: take 10 parts by mass of OH-terminated polyether-type TPU particles, mix 2 parts of polyester-type TPU particles, and use 18 parts by mass of toluene and 11 parts by mass of DMF as solvents to form TPU mixed liquid; using the release material as a support base, coating the TPU mixture on the release material; baking at 120° C. to volatilize the solvent to form a TPU base layer.

(B) making a rubber reinforced film, and coating the rubber reinforced film on the surface of the TPU base layer: 55 parts by mass of a terpene resin with a softening point of 140° C. combined with 150 parts by mass of petroleum resin, part by mass 25 SES/SEBS/SIS type rubber resins, add 0.5 parts by mass of antioxidants to form a mixed solution; bake the mixed solution at 120°C to volatilize the solvent and form rubber reinforcement on the surface of the TPU base layer membrane.

(C) Making a silica gel layer and coating the silica gel layer on the surface of the rubber reinforced film: mix 6 parts by mass of vinyl modified MQ resin, 2 parts of 80-1 million molecular weight 101 raw rubber, and 1-30,000 parts by mass 2 parts of molecular weight terminal vinyl silicone oil, using 17 parts by mass of toluene as a solvent, adding 0.2 parts by mass of hydrogen-containing silicone oil, 0.1 part of epoxy modified silicone oil and 0.2 part of 5000ppm platinum catalyst to form a silica gel mixture; It is coated on the surface of the rubber reinforced film; the method of gradually heating up is used to volatilize the solvent of the silica gel mixture to obtain a silica gel layer covering the surface of the rubber reinforced film. 160° C., the step (C) further includes, covering the surface of the silica gel layer with a layer of release material.

(D) make the acrylic layer, and apply the acrylic layer to another table of the TPU base layer: add 0.15 parts of isocyanate curing agent to the acrylic copolymer of 10 parts by mass, use 12 parts by mass of ethyl acetate and parts by mass Several 10 parts of toluene are mixed to form an acrylic acid solution; the acrylic acid solution is coated on the release material; a gradual heating method is used to volatilize the solvent of the acrylic acid solution to form an acrylic acid layer, and the method for gradually heating up is as follows: 50°C is the starting point and gradually rises to 110°C. The step (D) further includes, removing the release material covering the surface of the TPU base layer in step (A), and attaching the acrylic layer to the surface of the TPU base layer.

The double-sided adhesive tapes completed using the manufacturing methods of Examples 1 and 2 include a TPU base layer, the two surfaces of the TPU base layer are respectively covered with a rubber reinforced film and an acrylic layer, and the surface of the rubber reinforced film is covered with a silica gel layer. and the surfaces of the silica gel layer and the acrylic layer are respectively covered with a release material.

The surface adhesion of the acrylic layer of the double-sided tape of the present application on common plastics (such as PC) and stainless steel (according to the test standard ASTM D3330) can reach more than 30N/in, and the silicone layer can adhere to the surface of low surface energy materials. The force (such as PE, PP, according to the test standard ASTM D3330) reaches more than 20N/in. At the same time, due to the high cohesion of silica gel, the silica gel surface can also be repeatedly bonded after being removed after bonding, which meets the needs of repeated positioning in some assembly processes. In addition, a rubber reinforced film is coated on the surface of the TPU base layer, which makes the TPU substrate have better flexibility and strengthens the tensile strength of the TPU substrate.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (8)

1. A preparation method of a TPU double-sided tape with a rubber reinforced film is characterized by comprising the following steps of (A) preparing a TPU base layer; (B) manufacturing a rubber reinforced film, and coating the rubber reinforced film on the surface of the TPU base layer; (C) manufacturing a silica gel layer, and coating the silica gel layer on the surface of the rubber reinforced membrane; (D) and manufacturing an acrylic acid layer, and coating the acrylic acid layer on the other surface of the TPU base layer.

2. The preparation method according to claim 1, wherein the step (A) comprises taking 8-10 parts by mass of TPU particles, using 18-22 parts by mass of toluene and 11-18 parts by mass of DMF as solvents, and forming a TPU mixed solution; coating the TPU mixture on a release material by using the release material as a supporting foundation; baking at 50-120 deg.C to volatilize solvent and form TPU base layer.

3. The preparation method according to claim 2, wherein the step (B) comprises adding 0.1-0.5 parts by mass of an antioxidant to 50-55 parts by mass of a terpene resin having a softening point of 125-140 ℃ in combination with 15-20 parts by mass of a petroleum resin, 25-35 parts by mass of an SES/SEBS/SIS rubber resin to form a mixed solution; placing the mixed solution at 40-120 ℃ for baking to volatilize the solvent, forming a rubber reinforced film on the surface of the TPU base layer, wherein the integral thickness of the TPU base layer and the rubber reinforced film is within the range of 50-300 um, and the tensile strength is as follows: 5-60 MPa, elongation at break: 300 to 1000 percent.

4. The preparation method according to claim 3, wherein the step (C) specifically comprises mixing 6 parts by mass of the vinyl modified MQ resin with 2 parts by mass of 80-100 ten thousand of the raw rubber with the molecular weight of 101 and 2 parts by mass of 1-3 ten thousand of the terminal vinyl silicone oil, using 17 parts by mass of toluene as a solvent, and adding 0.2 part by mass of hydrogen-containing silicone oil, 0.1 part by mass of the epoxy modified silicone oil and 0.2 part by mass of 5000ppm of the platinum catalyst to form a silica gel mixed solution; coating the silica gel mixed solution on the surface of the rubber reinforced membrane; and volatilizing the solvent of the silica gel mixed solution by adopting a gradual heating method to obtain a silica gel layer covering the surface of the rubber reinforced membrane.

5. The preparation method according to claim 4, wherein the temperature is gradually increased to 150-160 ℃ from 40-50 ℃, and the step (C) further comprises covering a layer of release material on the surface of the silica gel layer.

6. The preparation method according to claim 5, wherein the step (D) is specifically that 10 parts by mass of the acrylic copolymer is added with 0.15 part by mass of the isocyanate curing agent, and 12 parts by mass of ethyl acetate and 10 parts by mass of toluene are mixed to form an acrylic solution; coating the acrylic acid solution on a release material; and (3) volatilizing the solvent of the acrylic acid solution by adopting a gradual temperature rise method to form an acrylic acid layer.

7. The preparation method according to claim 6, wherein the temperature is gradually increased to 100 to 110 ℃ from 40 to 50 ℃, and the step (D) further comprises removing the release material covering the surface of the TPU substrate in the step (A) and attaching the acrylic layer to the surface of the TPU substrate.

8. The TPU double-sided tape is characterized in that the double-sided tape comprises a TPU base layer, two surfaces of the TPU base layer are respectively covered with a rubber reinforced film and an acrylic acid layer, the surface of the rubber reinforced film is covered with a silica gel layer, and the surfaces of the silica gel layer and the acrylic acid layer are respectively covered with a release material.

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