Reusable high-temperature viscosity-reducing adhesive tape

Abstract

The invention relates to the technical field of pressure-sensitive adhesive tapes, in particular to a reusable high-temperature viscosity-reducing adhesive tape which comprises a pressure-sensitive adhesive body, the pressure-sensitive adhesive body comprises polyisoprene and tackifying resin, and the tackifying resin can be two or three of petroleum resin, terpene resin and phenolic resin; when the weight part of the polyisoprene is 100 parts, the weight part of the petroleum resin is 0-30 parts; the weight part of the terpene resin is 20 to 60 parts; the weight part of the phenolic resin is 3 to 10 parts. Compared with the prior art, the reusable high-temperature viscosity-reducing adhesive tape has high viscosity at normal temperature, the viscosity of the adhesive tape is greatly reduced during high-temperature processing, the adhesive tape can be easily peeled off when the adhesive tape is still hot, and when the adhesive tape recovers to the room temperature, the viscosity recovers to the level before use, so that the reusable high-temperature viscosity-reducing adhesive tape can be reused for multiple times.

Description

[Technical field]

[0001] The invention relates to the technical field of pressure-sensitive adhesive tapes, in particular to a reusable high-temperature adhesive tape. [Background technology]

[0002] Pressure-sensitive tape is often used for fixing when processing or cutting the surface of materials. The tape needs to have good adhesion. After the processing is completed, it is difficult to peel off the highly viscous tape. Therefore, a viscosity-reducing measure is needed to significantly reduce the viscosity of the tape.

[0003] The conventionally used adhesive tapes include UV light adhesive tape and thermal foam adhesive tape. However, these adhesive tapes are disposable and cannot be reused. [Summary of the invention]

[0004] In order to overcome the above problems, the present invention provides a reusable high-temperature viscosity-reducing tape that can effectively solve the above problems.

[0005] The present invention provides a technical solution to solve the above technical problems: providing a reusable high-temperature viscosity-reducing tape, including a pressure-sensitive adhesive body, the pressure-sensitive adhesive body includes polyisoprene and a tackifying resin, and the tackifying resin can be two or three of petroleum resin, terpene resin and phenolic resin.

[0006] Preferably, based on 100 parts by weight of polyisoprene, the weight of the petroleum resin is 0 to 30 parts; the weight of the terpene resin is 20 to 60 parts; and the weight of the phenolic resin is 3 to 10 parts.

[0007] Preferably, the polyisoprene is modified polyisoprene.

[0008] Preferably, the pressure-sensitive adhesive body includes a curing agent, and the curing agent is an isocyanate curing agent.

[0009] Preferably, the reusable high-temperature viscosity-reducing tape comprises a substrate and a release film, the pressure-sensitive adhesive body is adhered to the substrate, the release film is adhered to the pressure-sensitive adhesive body, and the substrate and the release film are respectively located on different sides of the pressure-sensitive adhesive body.

[0010] Preferably, the method for preparing the modified polyisoprene comprises the following steps:

[0011] Step A1, using cis-1,4-polyisoprene rubber, and plasticizing the rubber through an open mill;

[0012] Step A2, using toluene as solvent, putting the rubber masticated in step A1 into a reaction kettle and dissolving it while stirring, and passing nitrogen to remove oxygen;

[0013] Step A3, gradually adding the modified mixed monomer solution to the reactor by dropwise addition, keeping the temperature after the addition is completed, and terminating the reaction when the viscosity rises to a certain value.

[0014] Preferably, the modified mixed monomer includes styrene, methyl methacrylate, hydroxyethyl acrylate and initiator BPO.

[0015] Preferably, in step A2, the polyisoprene rubber is dissolved to obtain a solution having a rubber concentration of 25-35%.

[0016] Preferably, in step A3, the amount of the modified mixed monomer is between 5% and 20% of the amount of the polyisoprene rubber; the amount of the functional monomer hydroxyethyl acrylate is between 2% and 10% of the total amount of the modified mixed monomer; and the amount of the initiator BPO is between 0.2% and 0.8% of the amount of the polyisoprene rubber.

[0017] Preferably, in step A3, the modified mixed monomer solution is added within 1.5 to 3 hours; after the modified mixed monomer solution is added, the temperature is kept constant, and when the viscosity of the glue in the reactor reaches 20,000 mPa.s, cold water is passed to terminate the reaction.

[0018] Compared with the prior art, the reusable high-temperature viscosity-reducing tape of the present invention utilizes the unique viscoelasticity and non-polar properties of rubber pressure-sensitive adhesive to prepare a reusable tape that loses viscosity significantly at high temperatures and recovers viscosity at room temperature to meet the needs of fixation, protection, etc. in the processing of some materials.

Brief Description of the Drawings

[0019] Figure 1 The diagram is a layered structure diagram of the reusable high-temperature viscosity-reducing tape of the present invention. [Specific implementation method]

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0022] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] See also Figure 1 The reusable high-temperature viscosity-reducing tape of the present invention is suitable for use as a protective tape during material thermal processing, and includes a pressure-sensitive adhesive body 20. The pressure-sensitive adhesive body 20 includes polyisoprene and a tackifying resin. The tackifying resin can be two or three of a petroleum resin, a terpene resin, and a phenolic resin.

[0024] Based on 100 parts by weight of polyisoprene, the weight of the petroleum resin is 0 to 30 parts; the weight of the terpene resin is 20 to 60 parts; and the weight of the phenolic resin is 3 to 10 parts.

[0025] The polyisoprene is modified polyisoprene.

[0026] The polyisoprene is graft-modified polyisoprene rubber.

[0027] The pressure-sensitive adhesive body 20 includes a curing agent, and the curing agent is an isocyanate curing agent, which is used to increase the substrate adhesion and heat resistance of the adhesive.

[0028] The reusable high-temperature viscosity-reducing tape of the present invention also includes a substrate 10 and a release film 30. The pressure-sensitive adhesive body 20 is adhered to the substrate 10, and the release film 30 is adhered to the pressure-sensitive adhesive body 20. The substrate 10 and the release film 30 are respectively located on different sides of the pressure-sensitive adhesive body 20.

[0029] The preparation method of the modified polyisoprene comprises the following steps:

[0030] Step A1, using cis-1,4-polyisoprene rubber, plasticizing the rubber through an open mill to reduce the molecular weight of the rubber.

[0031] In the step A1, the strength of the polyisoprene rubber is greatly reduced after being thin-passed for multiple times.

[0032] Step A2, using toluene as solvent, placing the rubber that has been plasticized in step A1 into a reaction kettle with condensation reflux and water bath heating devices, dissolving it while stirring, and passing nitrogen to remove oxygen.

[0033] In the step A2, the polyisoprene rubber is cut into small pieces, added into a preheated reactor, and dissolved while being stirred.

[0034] In the step A2, the polyisoprene rubber is dissolved to obtain a solution with a rubber concentration of 25-35%.

[0035] Step A3, using a dropwise addition method, gradually add the solution of modified mixed monomers styrene, methyl methacrylate, hydroxyethyl acrylate and initiator BPO to the reactor, and after the dropwise addition is completed, keep warm. When the viscosity rises to a certain temperature, terminate the reaction.

[0036] In the step A3, the amount of the modified mixed monomer is between 5% and 20% of the amount of the polyisoprene rubber.

[0037] In the step A3, the amount of the functional monomer hydroxyethyl acrylate is between 2% and 10% of the total amount of the modified mixed monomers.

[0038] In the step A3, the amount of the initiator BPO used is between 0.2% and 0.8% of the amount of the polyisoprene rubber used.

[0039] In step A3, the temperature in the reactor is set between 80 and 90°C.

[0040] In the step A3, the modified mixed monomer solution is added gradually in 1.5 to 3 hours. After the modified mixed monomer solution is added, it is kept warm. When the viscosity of the glue in the reactor increases significantly, samples are taken to test the viscosity. When the viscosity reaches 20,000 mPa.s, cold water is passed to terminate the reaction.

[0041] Coating process: After the modified polyisoprene glue is obtained through steps A1 to A3, different coating methods can be used for substrates 10 with different temperature resistance levels. For substrates with good temperature resistance such as PET film and PI film, a direct coating method can be used, and the baking temperature is between 100 and 130°C. After the coating is completed, the tape performance will be stabilized after aging at room temperature for 3 days. When the substrate is a material with insufficient temperature resistance such as PVC, BOPP or PA film, a transfer coating method can be used, and the coating temperature is between 90 and 120°C. After the coating is completed, a aging treatment of about 1 to 2 days at 50 to 70°C is required to stabilize the tape performance.

[0042] The reusable high temperature viscosity-reducing tape of the present invention is a high temperature viscosity-reducing adhesive made of modified polyisoprene, and its upper temperature limit is 150°C. If the temperature exceeds this limit, the undesirable phenomenon of peeling off the residual adhesive will occur. The lower limit is 60°C. If the temperature is lower than this limit, the viscosity-reducing effect is not obvious.

[0043] The relationship between the viscosity of the adhesive tape (180° peel strength) and the ambient temperature of the tape:

[0044] At room temperature: ≤20N / 25mm;

[0045] 60℃: 0.06~0.15N / 25mm;

[0046] 70℃: 0.04~0.10N / 25mm;

[0047] 80℃: 0.03~0.06N / 25mm;

[0048] 90℃~150: 0.002~0.04N / 25mm.

[0049] The general relationship is that the higher the temperature, the greater the reduction in tape viscosity.

[0050] Characteristics of repeated use of tape: The high-temperature peeling force fluctuates less when the tape is repeatedly used. Within 5 times of repeated use, the change in high-temperature peeling force is less than 5%.

[0051] Compared with the prior art, the reusable high-temperature viscosity-reducing tape of the present invention has higher viscosity at room temperature. The viscosity of the tape decreases significantly during high-temperature processing. The tape can be easily peeled off while hot. When the tape returns to room temperature, the viscosity returns to the level before use, so it can be reused many times.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.

Claims

1. A reusable high temperature adhesive tape, characterized in that: The invention comprises a pressure-sensitive adhesive body, wherein the pressure-sensitive adhesive body comprises polyisoprene and a tackifying resin, and the tackifying resin can be two or three of petroleum resin, terpene resin and phenolic resin.

2. The reusable high temperature adhesive tape according to claim 1, characterized in that: Based on 100 parts by weight of polyisoprene, the weight of the petroleum resin is 0 to 30 parts; the weight of the terpene resin is 20 to 60 parts; and the weight of the phenolic resin is 3 to 10 parts.

3. The reusable high temperature adhesive tape according to claim 1, characterized in that: The polyisoprene is modified polyisoprene.

4. The reusable high temperature adhesive tape according to claim 1, characterized in that: The pressure-sensitive adhesive body includes a curing agent, and the curing agent is an isocyanate curing agent.

5. The reusable high temperature adhesive tape according to claim 1, characterized in that: The reusable high-temperature viscosity-reducing tape comprises a substrate and a release film, wherein the pressure-sensitive adhesive body is adhered to the substrate, the release film is adhered to the pressure-sensitive adhesive body, and the substrate and the release film are respectively located on different sides of the pressure-sensitive adhesive body.

6. The reusable high temperature adhesive tape according to claim 3, characterized in that: The preparation method of the modified polyisoprene comprises the following steps: Step A1, using cis-1,4-polyisoprene rubber, and plasticizing the rubber through an open mill; Step A2, using toluene as solvent, putting the rubber masticated in step A1 into a reaction kettle and dissolving it while stirring, and passing nitrogen to remove oxygen; Step A3, gradually adding the modified mixed monomer solution to the reactor by dropwise addition, keeping the temperature after the addition is completed, and terminating the reaction when the viscosity rises to a certain value.

7. The reusable high temperature adhesive tape according to claim 6, characterized in that: The modified mixed monomers include styrene, methyl methacrylate, hydroxyethyl acrylate and initiator BPO.

8. The reusable high temperature adhesive tape according to claim 1, characterized in that: In the step A2, the polyisoprene rubber is dissolved to obtain a solution with a rubber concentration of 25-35%.

9. The reusable high temperature adhesive tape according to claim 7, characterized in that: In step A3, the amount of the modified mixed monomer is between 5% and 20% of the amount of the polyisoprene rubber; the amount of the functional monomer hydroxyethyl acrylate is between 2% and 10% of the total amount of the modified mixed monomer; and the amount of the initiator BPO is between 0.2% and 0.8% of the amount of the polyisoprene rubber.

10. The reusable high temperature adhesive tape according to claim 6, characterized in that: In the step A3, the modified mixed monomer solution is added within 1.5 to 3 hours; after the modified mixed monomer solution is added, the temperature is kept constant, and when the viscosity of the glue in the reactor reaches 20,000 mPa.s, cold water is passed to terminate the reaction.

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