Production process of writable invisible adhesive tape
By using high-crystalline polypropylene resin, inorganic substances and silsesquioxane antistatic agents, combined with twin-screw extruders and bidirectional extension processes, writing invisible tapes with excellent antistatic, writing and physical properties are prepared, solving the problem of poor mechanical properties of existing tapes.
Patent Information
- Application Number
- CN202510377567.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-06-06
AI Technical Summary
The existing writing invisible tape has poor mechanical properties, is easy to peel, has poor stickiness, and has fewer preparation techniques and unstable performance.
High crystalline polypropylene resin is used as the main material, combined with inorganic substances and silsesquioxane antistatic agents, and writing invisible tape with excellent antistatic, writing and physical properties is prepared through the extrusion molding of twin-screw extruder, bidirectional extension and corona treatment.
It achieves excellent antistatic properties, good writing properties, excellent physical properties and mechanical properties of the tape, which is not easy to peel and has strong stickiness.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of adhesive tapes, in particular to a production process of a writable invisible adhesive tape. Background Art
[0002] Writable invisible tape is a kind of tape with writing function, with uniform and stable adhesive force, no residual adhesive and traces left, the tape surface can be written, easy to unwind and tear by hand; it is mainly used for repairing holes on the paper surface, copying without traces, pasting documents, etc. It is widely used in animation original paintings, glasses, electronic manufacturing, consumer goods, toys, gift manufacturing and packaging, plastic products, metal products manufacturing and packaging, advertising production, clothing industry, etc.
[0003] The prior art rarely involves the preparation technology of writable invisible tape, and the prepared tape has poor mechanical properties, is easy to peel off, and has poor adhesion. Summary of the invention
[0004] In order to solve the above problems, the present invention provides a production process of a writable invisible tape, and the operation steps are as follows:
[0005] S1: Mix 60-80 parts of high crystalline polypropylene resin, 20-40 parts of inorganic matter with a particle size of 0.1-10 μm, and 0.02-0.3 parts of silsesquioxane antistatic agent by weight to obtain a writable invisible layer;
[0006] S2: The writable invisible layer, the middle layer and the adhesive backing layer are extruded and formed by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape.
[0007] The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
[0008] The melt index of the high crystalline polypropylene resin is 0.5-2.
[0009] The inorganic substance is one of calcium carbonate, diatomaceous earth, clay, calcium oxide, barium sulfate and titanium dioxide.
[0010] The temperature of the twin-screw extruder is 220-260°C.
[0011] The longitudinal stretching temperature of the bidirectional stretching is 120-150° C., and the stretching multiple is 3-5 times; the transverse stretching temperature is 150-180° C., and the stretching multiple is 6-9 times.
[0012] The thickness of the writable invisible tape is 30-60 μm.
[0013] The preparation method of the silsesquioxane antistatic agent is:
[0014] A1: Add 150-210 parts of anhydrous toluene to a reaction kettle, then add 0.8-2.5 parts of epoxy cyclohexyl-cage polysilsesquioxane, 12-18 parts of polyether F127 diacrylate, and 10-26 parts of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 2-5 parts of triethylamine and continue to stir evenly;
[0015] A2: At the same time, the temperature of the reaction system is controlled at 60-70°C, and the reaction is stirred for 1-4 hours. After the reaction is completed, the reaction solution is cooled to room temperature, and anhydrous toluene and unreacted raw materials are removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.
[0016] Reaction mechanism
[0017] An amino-epoxy ring-opening addition reaction occurs between epoxy cyclohexyl-cage polysilsesquioxane and 1,3-diaminoisopropanol; an amino-propylene addition reaction occurs between polyether F127 diacrylate and 1,3-diaminoisopropanol; and an antistatic agent is obtained.
[0018] Technical Effects
[0019] The present invention discloses a production process of a writable invisible adhesive tape. Compared with the prior art, the present invention has the following significant effects:
[0020] 1. Excellent antistatic performance: By using antistatic agents containing cage-shaped polysilsesquioxane and polyether, the static electricity accumulation on the surface of the tape is effectively reduced, dust adsorption is reduced, and the tape is kept clean and beautiful.
[0021] 2. Good writing performance: The synergistic effect of cage-shaped polysilsesquioxane and polyether improves the performance of the tape surface, so that the tape can meet the writing needs of a variety of writing tools such as fountain pens and ballpoint pens, and achieve clear and lasting writing effects.
[0022] 3. Excellent physical properties: The tape has good heat resistance, chemical corrosion resistance, flexibility and adhesion, and can adapt to different usage environments and needs.
[0023] 4. The writable invisible adhesive tape prepared by the present invention has excellent mechanical properties, is not easy to peel off, and has strong adhesive force. DETAILED DESCRIPTION
[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with embodiments and comparative examples:
[0025] 180° peeling force, holding force, tensile strength test: The test was carried out in accordance with GB / T22378-2008. The test results are shown in Table 1.
[0026] Example 1
[0027] A production process of a writable invisible tape, the operating steps of which are as follows:
[0028] S1: 60 g of high crystalline polypropylene resin, 20 g of inorganic matter with a particle size of 0.1 μm, and 0.02 g of silsesquioxane antistatic agent are mixed to obtain a writable invisible layer;
[0029] S2: The writable invisible layer, the middle layer and the adhesive backing layer are extruded and formed by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape.
[0030] The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
[0031] The melt index of the high crystalline polypropylene resin is 0.5.
[0032] The inorganic substance is calcium carbonate.
[0033] The temperature of the twin-screw extruder is 220°C.
[0034] The longitudinal stretching temperature of the bidirectional stretching is 120° C., and the stretching multiple is 3 times; the transverse stretching temperature is 150° C., and the stretching multiple is 6 times.
[0035] The thickness of the writable invisible tape is 30 μm.
[0036] The preparation method of the silsesquioxane antistatic agent is:
[0037] A1: Add 150g of anhydrous toluene to a reaction kettle, then add 0.8g of epoxy cyclohexyl-cage polysilsesquioxane, 12g of polyether F127 diacrylate (molecular weight 13000), and 10g of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 2g of triethylamine and continue to stir evenly;
[0038] A2: At the same time, the temperature of the reaction system was controlled at 60°C, and the reaction was stirred for 1 hour. After the reaction was completed, the reaction solution was cooled to room temperature, and anhydrous toluene and unreacted raw materials were removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.
[0039] Example 2
[0040] A production process of a writable invisible tape, the operating steps of which are as follows:
[0041] S1: 65 g of high crystalline polypropylene resin, 25 g of inorganic matter with a particle size of 2 μm, and 0.1 g of silsesquioxane antistatic agent are mixed to obtain a writable invisible layer;
[0042] S2: The writable invisible layer, the middle layer and the adhesive backing layer are extruded and formed by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape.
[0043] The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
[0044] The melt index of the high crystalline polypropylene resin is 1.
[0045] The inorganic substance is diatomaceous earth.
[0046] The temperature of the twin-screw extruder is 230°C.
[0047] The longitudinal stretching temperature of the bidirectional stretching is 130° C., and the stretching multiple is 4 times; the transverse stretching temperature is 160° C., and the stretching multiple is 7 times.
[0048] The thickness of the writable invisible tape is 40 μm.
[0049] The preparation method of the silsesquioxane antistatic agent is:
[0050] A1: Add 160g of anhydrous toluene to a reaction kettle, then add 1.3g of epoxy cyclohexyl-cage polysilsesquioxane, 14g of polyether F127 diacrylate (molecular weight 13000), and 15g of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 3g of triethylamine and continue to stir evenly;
[0051] A2: At the same time, the temperature of the reaction system was controlled at 65°C, and the reaction was stirred for 2 hours. After the reaction was completed, the reaction solution was cooled to room temperature, and anhydrous toluene and unreacted raw materials were removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.
[0052] Example 3
[0053] A production process of a writable invisible tape, the operating steps of which are as follows:
[0054] S1: 75 g of high crystalline polypropylene resin, 35 g of inorganic material with a particle size of 8 μm, and 0.2 g of silsesquioxane antistatic agent are mixed to obtain a writable invisible layer;
[0055] S2: The writable invisible layer, the middle layer and the adhesive backing layer are extruded and formed by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape.
[0056] The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
[0057] The melt index of the high crystalline polypropylene resin is 1.5.
[0058] The inorganic substance is clay.
[0059] The temperature of the twin-screw extruder is 250°C.
[0060] The longitudinal stretching temperature of the bidirectional stretching is 140° C., and the stretching multiple is 4 times; the transverse stretching temperature is 170° C., and the stretching multiple is 8 times.
[0061] The thickness of the writable invisible tape is 50 μm.
[0062] The preparation method of the silsesquioxane antistatic agent is:
[0063] A1: Add 200g of anhydrous toluene to a reaction kettle, then add 2.3g of epoxy cyclohexyl-cage polysilsesquioxane, 16g of polyether F127 diacrylate (molecular weight 13000), and 23g of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 4g of triethylamine and continue to stir evenly;
[0064] A2: At the same time, the temperature of the reaction system was controlled at 65°C, and the reaction was stirred for 3 hours. After the reaction was completed, the reaction solution was cooled to room temperature, and anhydrous toluene and unreacted raw materials were removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.
[0065] Example 4
[0066] A production process of a writable invisible tape, the operating steps of which are as follows:
[0067] S1: 80 g of high crystalline polypropylene resin, 40 g of inorganic matter with a particle size of 10 μm, and 0.3 g of silsesquioxane antistatic agent are mixed to obtain a writable invisible layer;
[0068] S2: The writable invisible layer, the middle layer and the adhesive backing layer are extruded and formed by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape.
[0069] The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
[0070] The melt index of the high crystalline polypropylene resin is 2.
[0071] The inorganic substance is titanium dioxide.
[0072] The temperature of the twin-screw extruder is 260°C.
[0073] The longitudinal stretching temperature of the bidirectional stretching is 150° C., and the stretching multiple is 5 times; the transverse stretching temperature is 180° C., and the stretching multiple is 9 times.
[0074] The thickness of the writable invisible tape is 60 μm.
[0075] The preparation method of the silsesquioxane antistatic agent is:
[0076] A1: Add 210g of anhydrous toluene to a reaction kettle, then add 2.5g of epoxy cyclohexyl-cage polysilsesquioxane, 18g of polyether F127 diacrylate (molecular weight 13000), and 26g of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 5g of triethylamine and continue to stir evenly;
[0077] A2: At the same time, the temperature of the reaction system was controlled at 70°C, and the reaction was stirred for 4 hours. After the reaction was completed, the reaction solution was cooled to room temperature, and anhydrous toluene and unreacted raw materials were removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.
[0078] Comparative Example 1
[0079] No silsesquioxane antistatic agent was added, and the other steps were the same as in Example 1.
[0080] Comparative Example 2
[0081] The polyether F127 diacrylate (molecular weight 13000) was not added, and the other procedures were the same as in Example 1.
[0082] Comparative Example 3
[0083] The other steps were the same as in Example 1 except that 1,3-diaminoisopropanol was not added.
[0084] Table 1
[0085]
[0086]
[0087] Through the data analysis of the above embodiments and comparative examples, the writable invisible tape prepared by the present invention has excellent mechanical properties, is not easy to peel off, and has strong adhesive force.
[0088] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A production process for a writable invisible tape, the operating steps of which are: S1: Mix 60-80 parts of high crystalline polypropylene resin, 20-40 parts of inorganic matter with a particle size of 0.1-10 μm, and 0.02-0.3 parts of silsesquioxane antistatic agent by weight to obtain a writable invisible layer; S2: The writable invisible layer, the middle layer and the adhesive layer are extruded by a twin-screw extruder, and then bidirectionally stretched, corona treated and wound to obtain a writable invisible tape; The silsesquioxane antistatic agent is prepared by reacting epoxy cyclohexyl-cage polysilsesquioxane, polyether F127 diacrylate and 1,3-diaminoisopropanol.
2. The production process of a writable invisible tape according to claim 1, characterized in that: The middle layer and the adhesive layer are both made of high-crystalline polypropylene resin.
3. The production process of a writable invisible tape according to claim 1, characterized in that: The melt index of the high crystalline polypropylene resin is 0.5-2.
4. The production process of a writable invisible tape according to claim 1, characterized in that: The inorganic substance is one of calcium carbonate, diatomaceous earth, clay, calcium oxide, barium sulfate and titanium dioxide.
5. The production process of a writable invisible tape according to claim 1, characterized in that: The temperature of the twin-screw extruder is 220-260°C.
6. The production process of a writable invisible tape according to claim 1, characterized in that: The longitudinal stretching temperature of the bidirectional stretching is 120-150° C., and the stretching multiple is 3-5 times; the transverse stretching temperature is 150-180° C., and the stretching multiple is 6-9 times.
7. The production process of a writable invisible tape according to claim 1, characterized in that: The thickness of the writable invisible tape is 30-60 μm.
8. The production process of a writable invisible tape according to claim 1, characterized in that: The preparation method of the silsesquioxane antistatic agent is: A1: Add 150-210 parts of anhydrous toluene to a reaction kettle, then add 0.8-2.5 parts of epoxy cyclohexyl-cage polysilsesquioxane, 12-18 parts of polyether F127 diacrylate, and 10-26 parts of 1,3-diaminoisopropanol in sequence, turn on the stirrer to fully dissolve the raw materials; add 2-5 parts of triethylamine and continue to stir evenly; A2: At the same time, the temperature of the reaction system is controlled at 60-70°C, and the reaction is stirred for 1-4 hours. After the reaction is completed, the reaction solution is cooled to room temperature, and anhydrous toluene and unreacted raw materials are removed by reduced pressure distillation to obtain a silsesquioxane antistatic agent.