High-dialysis high-toughness non-woven fabric double-sided adhesive tape and preparation method thereof

Abstract

The invention provides a double-sided tape with high dialysis and high toughness non-woven fabric as a base material, which comprises a carrier layer, a gluing layer and an anti-sticking release layer through unique material selection and a special preparation process. Wherein the carrier layer is made of a high-toughness non-woven fabric material, the gluing layer is made of an adhesive such as polyurethane with a special formula, and the adhesive has excellent bonding performance, temperature resistance and aging resistance; and the anti-sticking release layer adopts PEK release paper which is easy to peel, so that the prepared double-sided adhesive tape has excellent properties such as high toughness, tensile resistance, high dialysis property, high-temperature stability and no residual adhesive, and a more reliable and convenient adhesive solution is provided for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of adhesives, in particular to a high-dialysis high-toughness non-woven double-sided adhesive tape and a preparation method thereof. Background Art

[0002] In the industrial field, double-sided tapes are widely used. However, existing double-sided tapes made of textile materials such as woven fabrics, cotton paper, and non-woven fabrics have many disadvantages, such as insufficient substrate strength or toughness, poor tensile strength, unsatisfactory permeability, and inability to meet the requirements of light or gas permeability in specific fields. Acrylic glue is prone to softening and deformation under high temperature conditions, and loses its stickiness; and when the adherend is torn off in actual applications, glue residue is often left behind, affecting the appearance and subsequent processing. In addition, the adhesive retention performance of ordinary double-sided tapes is unstable and is easily affected by environmental factors such as humidity, temperature, water mist or air, etc., resulting in a decrease in the bonding effect.

[0003] At present, the cotton paper double-sided tape on the market may have the following deficiencies in terms of use in different industries and technology: 1. The tensile strength of the double-sided tape is weak, and when many electronic components and electronic equipment are subjected to vibration or impact, the bonding may become loose; 2. The temperature resistance is limited. In a high temperature environment, the glue is prone to softening, the viscosity decreases, or even loses its viscosity, affecting the stability of the electronic components; 3. During spraying operations in a high temperature environment, it is easy for glue to remain on the plastic parts during removal, and there will be residual glue on the end faces, which is time-consuming and inconvenient to remove; 4. The tolerance to the environment is poor, such as poor resistance to water mist, water vapor, water resistance, oil resistance, and chemical corrosion resistance, and it is easy to fail in harsh use environments; 5. The adhesive retention performance is unstable. After long-term use, the viscosity may weaken, affecting the firmness of the plastic parts.

[0004] In summary, the shortcomings of existing textile double-sided tapes in multiple key properties have seriously restricted their application and development in the industrial field. Therefore, developing a double-sided tape with excellent properties such as high toughness, tensile resistance, high dialysis, high temperature stability and no residual adhesive has become a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0005] The present invention aims to provide a double-sided adhesive tape with a high-permeability and high-toughness non-woven fabric substrate. Through unique material selection and special preparation process, it achieves excellent properties such as high toughness, tensile resistance, high permeability, high-temperature stability and no residual glue, providing a more reliable and convenient adhesive solution for industrial production.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a high-dialysis and high-toughness non-woven double-sided tape, the structural layers of which are, in order, an anti-adhesion release layer 1, an adhesive layer 2, a carrier layer 3, an adhesive layer 4 and an anti-adhesion release layer 5.

[0007] Furthermore, the weight of the anti-adhesive release layer 1 is 100-130 g / ㎡, the material of the anti-adhesive release layer is PEK release paper or base film, and the thickness is 110-150 μm.

[0008] Furthermore, the thickness of the adhesive layer 2 is ≥50 μm, and the adhesive force is ≥1500 g / inch.

[0009] Furthermore, the carrier layer 3 is a substrate layer, and a cotton paper substrate or non-woven fabric or fiber cloth is used, and the thickness of the carrier layer is 50-100 μm.

[0010] Furthermore, the thickness of the adhesive layer 4 is ≥60 μm, and the adhesive force is ≥1600 g / inch.

[0011] Furthermore, the weight of the anti-adhesive release layer 5 is 50-100 g / ㎡, and the material of the anti-adhesive release layer is PEK release paper or base film, with a thickness of 25-75 μm.

[0012] Furthermore, the thickness of the upper glue layer 2 is less than that of the upper glue layer 4, and the adhesion of the upper glue layer 2 is less than that of the upper glue layer 4. The glue of the two upper glue layers uses a thermal curing glue process, such as acrylate and polyurethane adhesives that are dried in a high-temperature oven and then compounded with the carrier layer. In the process of compounding the carrier layer, the carrier layer needs to be pretreated, which can be achieved by spraying water mist, solvents, steam and other processes. After the carrier layer is penetrated by the solution, it is combined with the upper glue layer for compounding. When the carrier layer and the upper glue layer reach the optimal state, the penetration effect will be more obvious. Compared with the same period last year, the general cotton double-sided adhesive on the market has not been surface treated by pretreatment. The main reason is that the light and thin substrate is light in weight, has poor stretchability, weak toughness resistance, and general production process, which is incomparable.

[0013] Furthermore, the release paper or base film of the anti-adhesive release layer has a release force range of ≤30 g / inch and a thickness of 25-75 μm.

[0014] As the most preferred solution of the present invention, the carrier layer adopts a high-toughness non-woven fabric material, the adhesive layer adopts a specially formulated polyurethane adhesive with excellent bonding properties, heat resistance and anti-aging properties; the anti-sticking release layer adopts an easily peelable PEK release paper.

[0015] On the other hand, the present invention also provides a method for preparing a high-dialysis high-toughness non-woven double-sided tape: 1. Preparation of non-woven fabric base: High-tenacity polyester fiber is selected and woven into a non-woven fabric base through a textile process. Its thickness is 50-100μm and its weight is about 23-28g / ㎡. The tensile strength reaches 12MPa, the elongation at break is 80%, and the wear resistance is good.

[0016] 2. Preparation of adhesive: Mix the polyurethane resin, cross-linking agent, tackifier, anti-aging agent and other raw materials in a certain proportion, heat them to a certain temperature for reaction, and obtain a polyurethane adhesive with excellent performance.

[0017] 3. Preparation of double-sided tape: evenly apply the prepared polyurethane adhesive on the pretreated non-woven fabric substrate to form an adhesive layer; then cover the adhesive layer with an easily peelable polyester film as a release layer, and tightly combine the layers by hot pressing or cold pressing.

[0018] 4. Curing and curing: Place the composite double-sided tape in a constant temperature and humidity environment for curing treatment to fully cure the adhesive layer and improve the bonding performance and stability.

[0019] 5. Inspection and packaging: Carry out quality inspection on the finished products to ensure that all indicators meet the standard requirements before packaging, storage and use.

[0020] The tape obtained by the above preparation method has a highly transparent solid colloid in terms of overall structure and appearance. It can be identified that Songti No. 3 font can be clearly seen through the carrier layer at a distance of about 30 mm from the test sample. Due to the use of a high-toughness material substrate, it was found through a carrier layer pasting test that when the adhesion strength is less than the toughness strength, the carriers can be separated, the substrate is not damaged, and the carrier can be completely restored. For the adhesion of different surface materials, such as PC, ABS, PS, PET, SUS, AL, glass and other metal materials or plastic surfaces, when peeling or reworking is required after a certain period of bonding, it can be peeled off naturally and normally, and there will be no residual glue or residual glue marks on the surface of the material, which can effectively save time and labor costs. Compared with general cotton double-sided tape, it effectively improves work efficiency.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. High strength, toughness and tensile resistance, which can meet the use requirements under various complex working conditions. Through specific screening on the original substrate of ordinary cotton materials, the conventional cotton paper or non-woven fabric ranges from 9g / ㎡ to 200g / ㎡, combined with the characteristics and application fields of the substrate, the penetration ability of the glue, etc., the use of 17g / ㎡-28g / ㎡ substrate can enhance its toughness, achieve the tensile resistance of non-woven fabrics, and solve the risk of product falling off when vibrating in actual application.

[0022] 2. No glue residue or residual glue phenomenon, which improves the convenience and cleanliness of the product. Adhesives that are not easy to leave residual glue are used, which have good stickiness and good adhesion to different plastic surfaces such as PC, ABS, PS, SUS, glass, and metal surfaces. Metal materials have good adhesion properties, and the tape will not break, and there is no need to remove the tape after the material is damaged. At the same time, the tape can be completely peeled off without breaking in some high-temperature operations, which is conducive to the reuse of plastic parts and components. In addition, by increasing the softening point of the tackifying resin and enhancing the temperature resistance, the physical property attenuation and shedding due to the softening of the colloid in a high temperature environment will not occur, which affects the bonding stability of electronic components.

[0023] 3. Stable adhesive performance and high temperature resistance broaden the application range of the product. After the performance of the glue is improved, it can be stored in a constant temperature and humidity environment for 1 year, with stable adhesiveness and no local loosening or degumming.

[0024] 4. High dialysis performance, suitable for application scenarios that require air permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the high-dialysis and high-toughness non-woven double-sided tape provided by the present invention. DETAILED DESCRIPTION

[0026] Example 1 S1. Carrier layer selection: Use high-tenacity non-woven fabric with a thickness of 50-100μm and a weight of 23-28g / ㎡ as the base material.

[0027] S2. Preparation of adhesive: Mix polyurethane resin (150 parts by weight), cross-linking agent (7.5 parts by weight), tackifier (15 parts by weight), anti-aging agent (4 parts by weight) and 1 part of curing agent, and heat to 80°C for reaction for 2 hours to obtain polyurethane adhesive.

[0028] S3. Coating and lamination: Use 0.13mm thick PEK release paper as the release layer, apply the prepared polyurethane adhesive on the adhesive layer, dry it at high temperature of 100°C, and then evenly coat it on the pretreated non-woven fabric carrier with a coating thickness of 0.05mm, then press and cool to obtain an adhesive tape.

[0029] S4. Curing and curing: Place the laminated double-sided tape in a constant temperature and humidity chamber (temperature 25°C, humidity 50%) for 168 hours.

[0030] Comparative Example 1 The carrier layer is generally made of translucent cotton with a thickness of about 40-50 um and a weight of 14-17 g / ㎡. Other compositions and processes are the same as those in Example 1.

[0031] Performance Testing The double-sided adhesive tapes prepared in the examples and comparative examples were subjected to performance tests. The specific test methods are as follows. The measured results are shown in Table 1.

[0032] (1) Tensile strength and elongation at break: tested using a universal material testing machine, referring to GB / T 30776-2014.

[0033] (2) Steel plate peeling force test: The test is carried out using a peeling force test machine, referring to GB / T 2792-2014.

[0034] (3) Steel plate holding force test: The test is carried out using a holding force test machine, referring to GB / T 4851-2014.

[0035] Table 1 - Performance test of examples and comparative examples example Tensile strength of substrate / MPa Elongation at break / % Peel force / gf / in Holding force / min Temperature resistance / ℃ Residual glue Example 1 0.22 52% 2100 10000 120 No residual glue Comparative Example 1 0.03 20% 1750 1400 80 There is residual glue It can be seen from the measured results that in the same production process, the double-sided adhesive produced by the present invention using a high-strength and high-toughness non-woven fabric substrate has superior performance compared to the original ordinary cotton paper substrate in various performance comparisons, and also has the characteristic of no residual glue under high or normal temperature.

Claims

1. A high-dialysis and high-toughness non-woven double-sided tape, characterized in that: The structural layers are in the order of anti-adhesive release layer 1, adhesive layer 2, carrier layer 3, adhesive layer 4 and anti-adhesive release layer 5. The weight of the anti-adhesive release layer 1 is 100-130 g / ㎡, the material of the anti-adhesive release layer is PEK release paper or base film, and the thickness is 110-150 μm; The thickness of the upper adhesive layer 2 is ≥50 μm, and the adhesive force is ≥1500 g / inch; The carrier layer 3 is a substrate layer, using a cotton paper substrate or non-woven fabric, fiber cloth, and the thickness of the carrier layer is 50-100 μm; The thickness of the adhesive layer 4 is ≥60 μm, and the adhesive force is ≥1600 g / inch; The weight of the anti-adhesive release layer 5 is 50-100 g / ㎡, and the material of the anti-adhesive release layer is PEK release paper or base film, with a thickness of 25-75 μm.

2. A high-dialysis high-tenacity non-woven double-sided tape as claimed in claim 1, characterized in that: The thickness of the upper glue layer 2 is smaller than that of the upper glue layer 4 , and the adhesive force of the upper glue layer 2 is smaller than that of the upper glue layer 4 .

3. A high-dialysis high-tenacity non-woven double-sided tape as claimed in claim 2, characterized in that: The glue of the upper glue layer adopts a thermal curing glue process, using an acrylate or polyurethane adhesive and then compounding it with the carrier layer after drying in a high-temperature oven. During the composite carrier layer process, the carrier layer needs to be pretreated by spraying water mist, solvent or steam process. After the carrier layer is penetrated by the solution, it is combined with the upper glue layer for compounding.

4. A high-dialysis high-tenacity non-woven double-sided tape as described in any one of claims 1-2, characterized in that: The release force of the anti-adhesive release layer is in the range of ≤30 g / inch and the thickness is 25-75 μm.

5. A high-dialysis high-tenacity non-woven double-sided tape as claimed in claim 1, characterized in that: The carrier layer is made of a non-woven fabric material with high toughness, the adhesive layer is made of a polyurethane adhesive, and the anti-adhesive release layer is made of an easily peelable PEK release paper.

6. A method for preparing the high-dialysis high-tenacity non-woven double-sided tape according to any one of claims 1 to 5, characterized in that: The following steps are included: S1. Preparation of non-woven fabric base: High-tenacity polyester fiber is selected and woven into a non-woven fabric base through a textile process. The thickness is 50-100 μm, the weight is about 23-28 g / ㎡, the tensile strength reaches 12 MPa, the elongation at break is 80%, and the wear resistance is good; S2. Preparation of adhesive: The polyurethane resin, cross-linking agent, tackifier, anti-aging agent and other raw materials are mixed uniformly in a certain proportion, heated to a certain temperature for reaction, and a polyurethane adhesive with excellent performance is obtained; S3. Preparation of double-sided adhesive: The prepared polyurethane adhesive is evenly coated on the pre-treated non-woven fabric substrate to form an adhesive layer; then an easily peelable polyester film is covered on the adhesive layer as a release layer, and the layers are tightly bonded by hot pressing or cold pressing; S4. Curing and curing: Place the laminated double-sided tape in a constant temperature and humidity environment for curing to fully cure the adhesive layer and improve the bonding performance and stability.

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