Carrier film easy to peel at normal temperature and preparation method thereof

Abstract

The invention relates to the technical field of bearing films, in particular to a normal-temperature easy-to-peel bearing film and a preparation method thereof. The normal-temperature easy-to-peel bearing film comprises a base material, a polyester adhesive coated on the surface of the base material, and an isolating film adhered on the surface of the polyester adhesive, the base material is at least one of a polyethylene glycol terephthalate film, a polyimide film and a polyolefin film; and the isolating film is at least one of a release film, release paper, synthetic paper, a polypropylene film and a polyethylene film. The polyester adhesive is obtained by dissolving polyester resin and a coupling agent in a solvent, then adding a cross-linking agent and uniformly mixing; or the polyester adhesive is obtained by dissolving polyester resin, a coupling agent and a stabilizing material in a solvent, then adding a cross-linking agent and uniformly mixing. The bearing film is easy to strip under the normal temperature condition, operation of an automatic technology is facilitated, it is ensured that when the temperature rises in the manufacturing process, the bearing film can provide enough viscosity, and meanwhile the bearing film has the advantages of being resistant to acid and alkali and free of adhesive residues.

Description

Technical Field

[0001] The present invention relates to the technical field of carrier films, and in particular to a room-temperature easily peelable carrier film and a preparation method thereof. Background Art

[0002] In the field of electronic manufacturing, a tape is needed to temporarily fix components for subsequent processing and handling. For example, in the semiconductor packaging and cutting process, a carrier film is needed to be attached to the wafer so that it can carry the wafer during the grinding, polishing, cutting, lead, packaging and other processes, and protect the non-processed surface of the product from being damaged during the process. When the component is removed from the top after processing, it is easy to peel off, and there must be no contamination on the component.

[0003] The materials currently used in the process are mainly the following two types: low-viscosity pressure-sensitive tape (protective film) and UV anti-viscosity tape. Among them, the peeling force of low-viscosity pressure-sensitive tape (protective film) is usually difficult to meet the requirements at both room temperature and heating conditions; acrylic systems are often not heat-resistant. For example, they have high viscosity at high temperatures, but when they are restored to room temperature for peeling, the peeling force at room temperature is high, making it difficult to peel and easily damaging the components; and if the normal peeling force at room temperature is maintained, the peeling force will be too low in the heated state, making it impossible to keep the components fixed, causing problems such as flying chips.

[0004] UV de-adhesive tape requires the addition of UV lighting equipment, and light must be avoided during the entire process to prevent the tape from losing its adhesion. It can only be used on transparent or UV-transmissive products, otherwise it cannot be debonded, so it has great limitations. In addition, this type of tape has poor heat and chemical resistance, and is prone to residual glue.

[0005] At present, there is an excellent research prospect on how to provide a carrier film that can provide sufficient viscosity when the temperature rises during the process to ensure that the components are fixed and do not fall off, while having low peeling force at room temperature, and being acid and alkali resistant and without residual adhesive. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a room temperature easy-to-peel carrier film and a preparation method thereof.

[0007] A room temperature easily peelable carrier film comprises: a substrate, a polyester adhesive coated on the surface of the substrate, and an isolation film attached to the surface of the polyester adhesive; the substrate is at least one of a polyethylene terephthalate film, a polyimide film, and a polyolefin film; and the isolation film is at least one of a release film, a release paper, a synthetic paper, a polypropylene film, and a polyethylene film.

[0008] Preferably, the polyester adhesive is obtained by dissolving a polyester resin and a coupling agent in a solvent, and then adding a cross-linking agent and mixing them uniformly.

[0009] Preferably, the polyester adhesive is obtained by dissolving a polyester resin, a coupling agent and a stabilizing material in a solvent, and then adding a cross-linking agent and mixing them uniformly.

[0010] Preferably, the polyester resin comprises, by mass, 10-30 parts of polyester resin A, 15-25 parts of polyester resin B, and 0-9 parts of polyester resin C; wherein the number average molecular weight of polyester resin A is 19000-21000, and the glass transition temperature is 63-67°C; the number average molecular weight of polyester resin B is 5500-6500, and the glass transition temperature is 12-18°C; the number average molecular weight of polyester resin C is 24000-26000, and the glass transition temperature is 8-12°C.

[0011] Preferably, the coupling agent is a silane coupling agent.

[0012] Preferably, the crosslinking agent is aliphatic polyisocyanate and / or acetylacetone.

[0013] Preferably, the solvent is butanone.

[0014] Preferably, the mass ratio of polyester resin, coupling agent and cross-linking agent is 40-60:0.1-1:0.1-1.

[0015] Preferably, the mass ratio of polyester resin, coupling agent, stabilizing material and cross-linking agent is 40-60:0.1-1:1-5:0.1-1.

[0016] Preferably, the stabilizing material is prepared by the following specific steps: adding tetraethyl orthosilicate to an ethanol aqueous solution, adding sodium dodecylbenzene sulfonate thereto, ultrasonically treating for 5-15 minutes, adjusting the pH value of the system to 8-10, continuing the ultrasonic treatment for 1-2 hours, adjusting the system to be neutral, sequentially adding methyl methacrylate and styrene thereto under stirring, continuing stirring for 10-20 minutes after the addition is complete, adjusting the temperature of the system to 70-80°C, adding ammonium persulfate thereto under stirring, continuing stirring for 30-50 minutes, standing for 1-3 hours, cooling to room temperature, centrifuging, washing, and vacuum drying.

[0017] The present invention forms nano silicon dioxide material by a liquid phase method, and after surface modification, the dispersion performance is excellent. The obtained stabilizing material can be directly blended with polyester resin, and the two have excellent dispersion performance, which not only makes the silicon dioxide particles and the polyester resin have good compatibility and gives full play to the excellent performance, but also can make the obtained polyester adhesive have good acid and alkali resistance by accurately controlling the ratio of the two, so that the carrier film can maintain stable performance in various chemical environments, and at the same time, no residual glue will be left on the substrate after peeling at room temperature, and the peeling effect at room temperature is excellent.

[0018] Preferably, the ultrasound frequency is 5-12 kHz.

[0019] Preferably, the mass ratio of tetraethyl orthosilicate, sodium dodecylbenzenesulfonate, methyl methacrylate, styrene and ammonium persulfate is 5-10:1-2:1-3:1-2:0.01-0.1.

[0020] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of a substrate, drying, and then laminating a release film on the surface of the polyester adhesive.

[0021] Beneficial effects:

[0022] The present invention has developed a room temperature peelable carrier film, the adhesion effect will be improved as the temperature rises, and it can reach more than 8N / inch at 50°C, which can effectively fix the product. After completing the whole process and returning to room temperature (about 23°C), the viscosity is reduced to less than 0.4N / inch, so that the components originally fixed on the carrier film can be easily peeled off without causing damage. At the same time, there is no pollution on the surface of the object being attached, and there is no need to modify the production environment equipment or add additional equipment.

[0023] The carrier film obtained by the present invention consists of three parts: a substrate, a polyester adhesive and a release film. Not only is the peeling force at room temperature less than 0.4 N / inch, it is easy to peel at room temperature and convenient for the operation of the automated process. The peeling force at 50° C. is greater than 8 N / inch, ensuring that when the temperature rises during the process, the carrier film can provide sufficient viscosity to ensure that the components are fixed and do not fall off. At the same time, it has the characteristics of acid and alkali resistance and no residual glue, and can meet the specific requirements of the electronics industry, especially the semiconductor industry, for the performance of the carrier film during the packaging and fixing process.

[0024] The invention is acid and alkali resistant and does not leave residual adhesive, so that the carrier film can maintain stable performance in various chemical environments, and will not leave residual adhesive on the substrate after peeling, avoiding pollution to the components. Compared with traditional UV anti-viscosity tape, the tape of the invention does not require modification of the existing production environment, nor does it require the addition of ultraviolet anti-viscosity equipment. Moreover, the product of the invention is a fully reacted polyester resin, which has significant advantages in heat resistance, chemical resistance and residual adhesive compared to acrylic resin that still needs light reaction. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific embodiments.

[0026] PET film was purchased from Sichuan Moucai Technology Group Co., Ltd.; PET isolation film was purchased from Yangzhou Mourun Optoelectronics Technology Co., Ltd.; polyester resin A, polyester resin B, and polyester resin C were all from Toyobo Co., Ltd. of Japan; silane coupling agent was from Shin-Etsu Chemical Co., Ltd. of Japan, with the brand name KBM-403; aliphatic polyisocyanate was from Covestro AG, with the model number N 3300.

[0027] Example 1

[0028] A room temperature easily peelable carrier film comprises: a PET film, a polyester adhesive coated on the surface of the PET film, and a PET isolation film attached to the surface of the polyester adhesive.

[0029] The thickness of the PET film is 100 μm, the thickness of the polyester adhesive is 40 μm, and the thickness of the PET isolation film is 25 μm.

[0030] The polyester adhesive was prepared by the following specific operation: 25.7 parts of polyester resin A and 19.4 parts of polyester resin B were dissolved in butanone respectively by mass; the dissolved polyester resin A, dissolved polyester resin B and 0.2 parts of silane coupling agent were added to the beating barrel in sequence, the mixer speed was 400 rpm, and stirred for 45 minutes; and 0.7 parts of aliphatic polyisocyanate was added and stirred for 30 minutes.

[0031] Among them, polyester resin A is used as a high-temperature material, and its number average molecular weight is 20,000 and its glass transition temperature is 65°C; polyester resin B is used as a low-temperature material, and its number average molecular weight is 6,000 and its glass transition temperature is 15°C; and the total mass parts of butanone used is 54 parts.

[0032] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of the PET film, drying it in an oven, and then laminating a PET isolation film on the surface of the polyester adhesive.

[0033] Example 2

[0034] A room temperature easily peelable carrier film comprises: a PET film, a polyester adhesive coated on the surface of the PET film, and a PET isolation film attached to the surface of the polyester adhesive.

[0035] The thickness of the PET film is 100 μm, the thickness of the polyester adhesive is 40 μm, and the thickness of the PET isolation film is 25 μm.

[0036] The polyester adhesive was prepared by the following specific operation: 25.7 parts of polyester resin A and 19.4 parts of polyester resin B were dissolved in butanone respectively by mass; the dissolved polyester resin A, dissolved polyester resin B and 0.2 parts of silane coupling agent were added to the beating barrel in sequence, the stirrer speed was 400 rpm, and stirred for 50 minutes; and 0.7 parts of acetylacetone were added and stirred for 30 minutes.

[0037] Among them, polyester resin A is used as a high-temperature material, and its number average molecular weight is 20,000 and its glass transition temperature is 65°C; polyester resin B is used as a low-temperature material, and its number average molecular weight is 6,000 and its glass transition temperature is 15°C; and the total mass parts of butanone used is 54 parts.

[0038] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of the PET film, drying it in an oven, and then laminating a PET isolation film on the surface of the polyester adhesive.

[0039] Example 3

[0040] A room temperature easily peelable carrier film comprises: a PET film, a polyester adhesive coated on the surface of the PET film, and a PET isolation film attached to the surface of the polyester adhesive.

[0041] The thickness of the PET film is 100 μm, the thickness of the polyester adhesive is 40 μm, and the thickness of the PET isolation film is 25 μm.

[0042] The polyester adhesive was prepared by the following specific operation: 16.7 parts of polyester resin A, 19.4 parts of polyester resin B, and 9 parts of polyester resin C were dissolved in butanone respectively by mass; the dissolved polyester resin A, dissolved polyester resin B, dissolved polyester resin C and 0.2 parts of silane coupling agent were added to a beating barrel in sequence, the mixer speed was 400 rpm, and stirred for 60 minutes; 0.6 parts of aliphatic polyisocyanate was added and stirred for 30 minutes, and filtered with a 200-mesh filter.

[0043] Among them, polyester resin A is used as a high-temperature material, with a number average molecular weight of 20,000 and a glass transition temperature of 65°C; polyester resin B is used as a low-temperature material, with a number average molecular weight of 6,000 and a glass transition temperature of 15°C; polyester resin C is used as a low-temperature material, with a number average molecular weight of 25,000 and a glass transition temperature of 10°C; and the total mass parts of butanone used is 54 parts.

[0044] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of the PET film, drying it in an oven, and then laminating a PET isolation film on the surface of the polyester adhesive.

[0045] Comparative Example 1

[0046] The low-viscosity protective film PS256-80 produced by Jiangsu Mouhe New Materials Co., Ltd. is used.

[0047] Comparative Example 2

[0048] The UV anti-adhesive tape PS612-160 produced by Jiangsu Mouhe New Materials Co., Ltd. is used.

[0049] The carrier films obtained in Examples 1-3 and the adhesive tapes obtained in Comparative Examples 1-2 were tested for room temperature (23° C.) peeling force, 50° C. peeling force, 50° C. acid resistance, and 50° C. alkali resistance. The results are shown in Table 1.

[0050] Among them, the 50℃ acid resistance test method is as follows: each group of samples is cut into 25×25mm squares, and completely attached to the surface of 304# steel sheet, and left to stand at room temperature for 24 hours; the steel sheet with the sample is immersed in a sulfuric acid aqueous solution at 50℃ and pH 2.0 and left to stand for 48 hours, then taken out to observe the edge seepage and record the maximum seepage width.

[0051] The alkali resistance test method is as follows: each group of samples is cut into 25×25mm squares, and completely attached to the surface of 304# steel sheet, and left to stand at room temperature for 24 hours; the steel sheet with the sample is immersed in a sodium hydroxide aqueous solution at 50℃ and pH 11.0 and left to stand for 48 hours, then taken out to observe the edge seepage and record the maximum seepage width.

[0052] Table 1 Test results of the carrier films obtained in Examples 1-3 and the adhesive tapes obtained in Comparative Examples 1-2

[0053]

[0054] Meanwhile, after the adhesive tape obtained in Comparative Example 2 was subjected to an alkali resistance test at 50° C., it was peeled off and it was found that offset printing remained on the surface of the 304# steel sheet.

[0055] Table 1 proves that the carrier film obtained by the present invention not only has a peeling force of less than 0.4 N / inch at room temperature, which is easy to peel at room temperature and convenient for operation of automated processes, but also has a peeling force of more than 8 N / inch at 50° C., ensuring that when the temperature rises during the process, the carrier film can provide sufficient viscosity to ensure that the components are fixed and not fall off. At the same time, it has the characteristics of acid and alkali resistance and no residual glue, which can meet the specific requirements of the electronics industry, especially the semiconductor industry, for the performance of the carrier film during the packaging and fixing process.

[0056] Example 4

[0057] A room temperature easily peelable carrier film comprises: a PET film, a polyester adhesive coated on the surface of the PET film, and a PET isolation film attached to the surface of the polyester adhesive.

[0058] The thickness of the PET film is 100 μm, the thickness of the polyester adhesive is 40 μm, and the thickness of the PET isolation film is 25 μm.

[0059] The polyester adhesive was prepared by the following specific operation: 16.7 parts of polyester resin A, 19.4 parts of polyester resin B, and 9 parts of polyester resin C were dissolved in butanone respectively by mass; the dissolved polyester resin A, dissolved polyester resin B, dissolved polyester resin C and 0.2 parts of silane coupling agent and 3 parts of stabilizing material were added to a beating barrel in sequence, the mixer speed was 400 rpm, and stirred for 60 minutes; 0.6 parts of aliphatic polyisocyanate was added and stirred for 30 minutes, and filtered with a 200-mesh filter.

[0060] Among them, polyester resin A is used as a high-temperature material, with a number average molecular weight of 20,000 and a glass transition temperature of 65°C; polyester resin B is used as a low-temperature material, with a number average molecular weight of 6,000 and a glass transition temperature of 15°C; polyester resin C is used as a low-temperature material, with a number average molecular weight of 25,000 and a glass transition temperature of 10°C; and the total mass parts of butanone used is 54 parts.

[0061] The stabilizing material is prepared by the following specific steps: 8 parts of tetraethyl orthosilicate are added to 45 parts of 40% ethanol aqueous solution by mass, 1.5 parts of sodium dodecylbenzene sulfonate are added thereto, and ultrasonic treatment is carried out for 10 minutes at an ultrasonic frequency of 9 kHz. Ammonia water is used to adjust the pH value of the system to 9.0, and the ultrasonic treatment is continued for 1.5 hours to adjust the system to be neutral. Under stirring, 2 parts of methyl methacrylate and 1.5 parts of styrene are added thereto in turn. After the addition is complete, stirring is continued for 15 minutes at a stirring speed of 700 r / min. The temperature of the system is adjusted to 75°C, 0.05 parts of ammonium persulfate are added thereto under stirring, stirring is continued for 40 minutes, the mixture is allowed to stand for 2 hours, the temperature is cooled to room temperature, centrifuged, washed, and dried in vacuo.

[0062] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of the PET film, drying it in an oven, and then laminating a PET isolation film on the surface of the polyester adhesive.

[0063] Comparative Example 3

[0064] A room temperature easily peelable carrier film comprises: a PET film, a polyester adhesive coated on the surface of the PET film, and a PET isolation film attached to the surface of the polyester adhesive.

[0065] The thickness of the PET film is 100 μm, the thickness of the polyester adhesive is 40 μm, and the thickness of the PET isolation film is 25 μm.

[0066] The polyester adhesive was prepared by the following specific operation: 16.7 parts of polyester resin A, 19.4 parts of polyester resin B, and 9 parts of polyester resin C were dissolved in butanone respectively by mass; the dissolved polyester resin A, dissolved polyester resin B, dissolved polyester resin C and 0.2 parts of silane coupling agent and 3 parts of stabilizing material were added to a beating barrel in sequence, the mixer speed was 400 rpm, and stirred for 60 minutes; 0.6 parts of aliphatic polyisocyanate was added and stirred for 30 minutes, and filtered with a 200-mesh filter.

[0067] Among them, polyester resin A is used as a high-temperature material, with a number average molecular weight of 20,000 and a glass transition temperature of 65°C; polyester resin B is used as a low-temperature material, with a number average molecular weight of 6,000 and a glass transition temperature of 15°C; polyester resin C is used as a low-temperature material, with a number average molecular weight of 25,000 and a glass transition temperature of 10°C; and the total mass parts of butanone used is 54 parts.

[0068] The stabilizing material is prepared by the following specific steps: 8 parts of tetraethyl orthosilicate are added to 45 parts of 40% ethanol aqueous solution by mass, 1.5 parts of sodium dodecylbenzene sulfonate are added thereto, and ultrasonic treatment is carried out for 10 minutes at an ultrasonic frequency of 9 kHz. Ammonia water is used to adjust the pH value of the system to 9.0, and the ultrasonic treatment is continued for 1.5 hours to adjust the system to be neutral. Under stirring, 3.5 parts of methyl methacrylate are added thereto in sequence. After the addition is complete, stirring is continued for 15 minutes at a stirring speed of 700 r / min. The temperature of the system is adjusted to 75°C, 0.05 parts of ammonium persulfate are added thereto under stirring, stirring is continued for 40 minutes, the mixture is allowed to stand for 2 hours, the temperature is cooled to room temperature, centrifuged, washed, and vacuum dried.

[0069] The method for preparing the above-mentioned room temperature easily peelable carrier film comprises the following steps: applying a polyester adhesive to the surface of the PET film, drying it in an oven, and then laminating a PET isolation film on the surface of the polyester adhesive.

[0070] The carrier films obtained in Example 3, Example 4 and Comparative Example 3 were subjected to the above-mentioned room temperature (23° C.) peeling force, 50° C. peeling force, 50° C. acid resistance and 50° C. alkali resistance tests, and the results are shown in Table 2.

[0071] Table 2 Test results of the carrier films obtained in Example 3, Example 4 and Comparative Example 3

[0072]

[0073] Table 2 proves that the present invention further reduces the room temperature peeling force and improves the 50°C peeling force by directly blending the stabilizing material with the polyester resin, and enhances its alkali resistance while maintaining the original excellent acid resistance, so that the carrier film can maintain stable performance in various chemical environments.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A room temperature easy-to-peel carrier film, characterized in that: include: A substrate, a polyester adhesive coated on the surface of the substrate, and a release film attached to the surface of the polyester adhesive; The substrate is at least one of polyethylene terephthalate film, polyimide film and polyolefin film; and the isolation film is at least one of release film, release paper, synthetic paper, polypropylene film and polyethylene film.

2. The room temperature easily peelable carrier film according to claim 1, characterized in that: The polyester adhesive is prepared by dissolving a polyester resin and a coupling agent in a solvent, and then adding a cross-linking agent and mixing them evenly. Alternatively, the polyester adhesive is prepared by dissolving a polyester resin, a coupling agent and a stabilizing material in a solvent, and then adding a cross-linking agent and mixing them uniformly.

3. The room temperature easily peelable carrier film according to claim 2, characterized in that: The polyester resin comprises, by mass, 10-30 parts of polyester resin A, 15-25 parts of polyester resin B, and 0-9 parts of polyester resin C; Among them, the number average molecular weight of polyester resin A is 19000-21000, and the glass transition temperature is 63-67°C; the number average molecular weight of polyester resin B is 5500-6500, and the glass transition temperature is 12-18°C; the number average molecular weight of polyester resin C is 24000-26000, and the glass transition temperature is 8-12°C.

4. The room temperature easily peelable carrier film according to claim 2, characterized in that: The coupling agent is a silane coupling agent.

5. The room temperature easily peelable carrier film according to claim 2, characterized in that: The crosslinking agent is aliphatic polyisocyanate and / or acetylacetone.

6. The room temperature easily peelable carrier film according to claim 2, characterized in that: The solvent is butanone.

7. The room temperature easily peelable carrier film according to claim 2, characterized in that: The mass ratio of polyester resin, coupling agent and cross-linking agent is 40-60:0.1-1:0.1-1; Or, the mass ratio of polyester resin, coupling agent, stabilizing material: cross-linking agent is 40-60: 0.1-1：1-5：0.1-1。 8. The room temperature easily peelable carrier film according to claim 2, characterized in that: The stabilizing material is prepared by the following specific steps: adding tetraethyl orthosilicate to an ethanol aqueous solution, adding sodium dodecylbenzenesulfonate thereto, ultrasonically treating for 5-15 minutes, adjusting the pH value of the system to 8-10, continuing the ultrasonic treatment for 1-2 hours, adjusting the system to be neutral, sequentially adding methyl methacrylate and styrene thereto under stirring, continuing to stir for 10-20 minutes after the addition is complete, adjusting the temperature of the system to 70-80°C, adding ammonium persulfate thereto under stirring, continuing to stir for 30-50 minutes, standing for 1-3 hours, cooling to room temperature, centrifuging, washing, and vacuum drying.

9. The room temperature easily peelable carrier film according to claim 8, characterized in that: The mass ratio of tetraethyl orthosilicate, sodium dodecylbenzenesulfonate, methyl methacrylate, styrene and ammonium persulfate is 5-10:1-2:1-3:1-2:0.01-0.

1.

10. A method for preparing a room temperature easily peelable carrier film according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: applying polyester adhesive to the surface of the substrate, drying, and then laminating an isolation film on the surface of the polyester adhesive.

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