Shrink-proof peelable blue gel for touch screen and preparation method of shrink-proof peelable blue gel

Abstract

The invention discloses a shrink-proof touch screen peelable blue gel and a preparation method thereof, and belongs to the technical field of touch screen peelable glues.The shrink-proof touch screen peelable blue gel is prepared from, by mass, 5%-20% of thermoplastic elastomer, 10%-15% of tackifying resin, 60%-70% of solvent, 1%-5% of flatting agent and 0.01%-0.1% of blue toner. The thermoplastic elastomer is selected from at least one of a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-butadiene-styrene block copolymer and a styrene-ethylene-propylene-styrene block copolymer; the tackifying resin is selected from at least one of petroleum resin, rosin resin and terpene resin. According to the peelable blue gel, the drying rate in the film forming process can be effectively increased, the gel shrinkage prevention effect and the film forming compactness are good, the problems that existing peelable blue gel is prone to shrinkage, shrinkage cavities, lack of gel or prone to falling off are effectively solved, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screen peelable adhesives, and particularly to a shrinkage-proof touch screen peelable blue adhesive and a preparation method thereof. Background Art

[0002] Removable Blue Adhesive is a temporary one-component thermosetting adhesive designed specifically for touch screens such as LCD / OLED displays. It is blue and viscous, with the characteristics of easy peeling, strong toughness, no residual adhesive marks, and no need for secondary cleaning. It is mainly used for fixing the middle frame and the panel or bonding flexible screens, playing the role of temporary protection, facilitating subsequent debugging or maintenance, and reducing the production difficulty. Therefore, removable blue adhesive is widely used in the production of touch screens. At present, most removable blue adhesives are solvent-based. Solvent-based removable blue adhesives usually consist of thermoplastic resins and tackifying resins, and form a film on the transparent conductive glass and ITO coating of the film in the touch screen after the solvent volatilizes, playing the role of insulation, moisture-proof and protection. Existing solvent-based removable blue adhesives have the problems of easy peeling and easy shrinkage during the process of solvent volatilization and film formation, resulting in shrinkage holes and lack of glue after film formation. Especially when applied to glass with stepped positions, it is easy to fall off, leading to a decline in the protection effect and the yield rate, and requiring subsequent rework to replenish the glue, which greatly reduces the production efficiency. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a shrinkage-proof touch screen peelable blue adhesive, which can effectively improve the drying rate during film formation, has good shrinkage-proof effect and film formation density, effectively solves the problems of easy shrinkage, shrinkage holes, lack of glue or easy falling off existing in the existing removable blue adhesive, and greatly improves the production efficiency.

[0004] To solve the above problems, the technical solutions adopted by the present invention are as follows:

[0005] A shrinkage-proof touch screen peelable blue adhesive, which comprises the following components by mass percentage: 5-20% of thermoplastic elastomer, 10-15% of tackifying resin, 60-70% of solvent, 1-5% of leveling agent, and 0.01-0.1% of blue toner.

[0006] As a preferred embodiment of the present invention, the thermoplastic elastomer is selected from at least one of styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), and styrene-ethylene-propylene-styrene block copolymer (SEPS).

[0007] As a preferred embodiment of the present invention, the tackifying resin is selected from at least one of petroleum resin, rosin resin, and terpene resin.

[0008] As a preferred embodiment of the present invention, the solvent is selected from at least one of ethylcyclohexane, methylcyclohexane, cyclohexane, and xylene.

[0009] As a preferred embodiment of the present invention, the leveling agent is a silicone leveling agent or an acrylate leveling agent. Preferably, the silicone leveling agent is BYK361N and / or BYK333, and the acrylate leveling agent is BYK354 and / or BYK352.

[0010] As a preferred embodiment of the present invention, the shrinkage-proof touch screen peelable blue glue comprises the following components in mass percentage: 7-20% of thermoplastic elastomer, 10-13% of tackifying resin, 65-68% of solvent, 2-4% of leveling agent, and 0.03-0.7% of blue pigment.

[0011] As a preferred embodiment of the present invention, the shrinkage-proof touch screen peelable blue glue comprises the following components in mass percentage: 20% of thermoplastic elastomer, 10% of tackifying resin, 66.95% of solvent, 3% of leveling agent, and 0.05% of blue pigment.

[0012] The present invention also provides a preparation method of the shrinkage-proof touch screen peelable blue glue as described above, which comprises the following steps:

[0013] S1. According to the formulation amount, put the thermoplastic elastomer, tackifying resin, and solvent into a planetary stirring kettle, with a stirring speed of 700-1200 rpm, a dispersion speed of 1000-1500 rpm, and a stirring time of 1-3 h until the materials are fully dissolved;

[0014] S2. Add the blue pigment and the leveling agent, increase the stirring speed to 1300-1500 rpm, the dispersion speed to 1500-1800 rpm, and the stirring time to 0.5-1 h. After sampling and testing qualified, discharge the material to obtain the product.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The touch screen peelable blue glue of the present invention is composed of a thermoplastic resin, a tackifying resin, a solvent, a leveling agent, and a blue pigment. By adjusting the dosage ratio between the thermoplastic resin and the tackifying resin to control the viscosity of the material, the drying rate of the peelable blue glue can be improved, effectively preventing phenomena such as easy peeling, shrinkage, shrinkage holes, and lack of glue during the process of solvent volatilization and film formation. There is no need for subsequent glue replenishment process, which simplifies the process and greatly improves the production efficiency; at the same time, by adjusting the proportion of the suitable solvent, the drying rate during the drying process of the peelable blue glue can be improved, further improving the production efficiency. Description of the Drawings

[0017] Figure 1 The usage effect diagram of the peelable blue glue for the touch screen in Embodiment 1 of the present invention;

[0018] Figure 2 The usage effect diagram of the peelable blue glue for the touch screen in Embodiment 2 of the present invention;

[0019] Figure 3 The usage effect diagram of the peelable blue glue for the touch screen in Embodiment 3 of the present invention;

[0020] Figure 4 The usage effect diagram of the peelable blue glue for the touch screen in Embodiment 4 of the present invention;

[0021] Figure 5 The usage effect diagram of the peelable blue glue for the touch screen in Comparative Example 1 of the present invention;

[0022] Figure 6 The usage effect diagram of the peelable blue glue for the touch screen in Comparative Example 2 of the present invention;

[0023] Figure 7 The usage effect diagram of the peelable blue glue for the touch screen in Comparative Example 3 of the present invention;

[0024] Figure 8 The usage effect diagram of the peelable blue glue for the touch screen in Comparative Example 4 of the present invention. Detailed implementation manners

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0026] A shrinkage-proof glue peelable blue glue for a touch screen comprises the following components in mass percentage: 5-20% of a thermoplastic elastomer, 10-15% of a tackifying resin, 60-70% of a solvent, 1-5% of a leveling agent, and 0.01-0.1% of a blue pigment.

[0027] Among them, the thermoplastic elastomer is selected from at least one of styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-isoprene-styrene block copolymer, and styrene-ethylene-propylene-styrene block copolymer. The tackifying resin is selected from at least one of petroleum resin, rosin resin, and terpene resin. The solvent is selected from at least one of ethyl cyclohexane, methyl cyclohexane, cyclohexane, and xylene. The leveling agent is a silicone leveling agent or an acrylate leveling agent.

[0028] The present invention also provides a preparation method of the shrinkage-proof glue peelable blue glue for a touch screen as described above, which comprises the following steps:

[0029] S1. According to the formulation quantity, put the thermoplastic elastomer, tackifying resin and solvent into a planetary stirring kettle, with a stirring speed of 700 - 1200 rpm, a dispersion speed of 1000 - 1500 rpm, and a stirring time of 1 - 3 h until the materials are fully dissolved;

[0030] S2. Add blue pigment powder and leveling agent, increase the stirring speed to 1300 - 1500 rpm, the dispersion speed is 1500 - 1800 rpm, and the stirring time is 0.5 - 1 h. After sampling and testing qualified, discharge to obtain the product.

[0031] Example 1

[0032] A shrink - proof glue touch - screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 20%, petroleum resin C9 10%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue pigment powder 0.05%.

[0033] Example 2

[0034] A shrink - proof glue touch - screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 20%, petroleum resin C9 10%, methyl cyclohexane 66.95%, silicone leveling agent 3%, blue pigment powder 0.05%.

[0035] Example 3

[0036] A shrink - proof glue touch - screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 20%, petroleum resin C9 10%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue pigment powder 0.05%.

[0037] Example 4

[0038] A shrink - proof glue touch - screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 20%, petroleum resin C5 7%, petroleum resin C9 3%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue pigment powder 0.05%.

[0039] Comparative Example 1

[0040] A touch - screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 25%, petroleum resin C9 5%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue pigment powder 0.05%.

[0041] Comparative Example 2

[0042] A peelable blue glue for touch screens, which comprises the following components by mass percentage: 25% of thermoplastic elastomer SEBS, 5% of petroleum resin C9, 66.95% of methylcyclohexane, 3% of silicone leveling agent, and 0.05% of blue toner.

[0043] Comparative Example 3

[0044] A peelable blue glue for touch screens, which comprises the following components by mass percentage: 25% of thermoplastic elastomer SEBS, 5% of petroleum resin C9, 49.95% of ethylcyclohexane, 17% of methylcyclohexane, 3% of silicone leveling agent, and 0.05% of blue toner.

[0045] Comparative Example 4

[0046] A peelable blue glue for touch screens, which comprises the following components by mass percentage: 25% of thermoplastic elastomer SEBS, 5% of petroleum resin C5, 49.95% of ethylcyclohexane, 17% of methylcyclohexane, 3% of silicone leveling agent, and 0.05% of blue toner.

[0047] I. Performance testing of the peelable blue glue for touch screens

[0048] The viscosity, surface drying time, and complete curing time of the peelable blue glue for touch screens in Examples 1-4 and Comparative Examples 1-4 were tested, and the shrinkage of each peelable blue glue for touch screens during the testing process was recorded. Among them, the specific testing methods are as follows:

[0049] 1. Viscosity: Detected by a viscometer. The viscometer was set to 006, 1# rotor, 6 rpm, the torque was 30-80%, and the detection temperature was 25.0 °C + 0.5 °C.

[0050] 2. Surface drying time and complete curing time: The peelable blue glue was applied on a glass slide / glass, and the wet film thickness was 300 μm. The surface drying time and complete curing time were measured.

[0051] 3. Shrinkage situation: Observed with the naked eye.

[0052] The results are shown in Table 1 and Figures 1 to 8 .

[0053] Table 1 Performance testing of the peelable blue glue for touch screens in Examples 1-4 and Comparative Examples 1-4

[0054]

[0055]

[0056] As can be seen from Table 1, by increasing the dosage of the tackifying resin and reducing the dosage of the thermoplastic elastomer, the present invention can effectively solve the problems of shrinkage and easy peeling of the peelable blue glue during the film-forming process, and can well meet the user's usage requirements.

[0057] It can be seen from Figures 1 to 8 that the peelable blue glue of Comparative Examples 1-4 shrinks severely and is easy to peel off, and the solvent dries slowly, greatly reducing the production efficiency. The peelable blue glue of Example 1 has no shrinkage and is easy to peel off, but the solvent dries slowly, affecting the production efficiency; the peelable blue glue of Example 2 has no shrinkage and is easy to peel off, the solvent dries quickly, and there are slight bubbles; the peelable blue glue of Examples 3 and 4 has no shrinkage and is easy to peel off, the operation is suitable, and the solvent drying speed is moderate.

[0058] Example 5

[0059] A shrinkage-proof touch screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SBS 20%, petroleum resin C5 7%, petroleum resin C9 3%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue toner 0.05%.

[0060] Example 6

[0061] A shrinkage-proof touch screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SBS 20%, petroleum resin C5 7%, petroleum resin C9 3%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue toner 0.05%.

[0062] Example 7

[0063] A shrinkage-proof touch screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SIS 20%, petroleum resin C5 7%, petroleum resin C9 3%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue toner 0.05%.

[0064] Example 8

[0065] A shrinkage-proof touch screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 10%, SBS 10%, petroleum resin C5 7%, petroleum resin C9 3%, ethyl cyclohexane 49.95%, methyl cyclohexane 17%, silicone leveling agent 3%, blue toner 0.05%.

[0066] Comparative Example 5

[0067] A touch screen peelable blue glue, which comprises the following components by mass percentage: thermoplastic elastomer SBS 25%, petroleum resin C9 5%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue toner 0.05%.

[0068] Comparative Example 6

[0069] A peelable blue glue for touch screen, which comprises the following components by mass percentage: thermoplastic elastomer SBCS 25%, petroleum resin C9 5%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue toner 0.05%.

[0070] Comparative Example 7

[0071] A peelable blue glue for touch screen, which comprises the following components by mass percentage: thermoplastic elastomer SIS 25%, petroleum resin C9 5%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue toner 0.05%.

[0072] Comparative Example 8

[0073] A peelable blue glue for touch screen, which comprises the following components by mass percentage: thermoplastic elastomer SEBS 12.5%, SBS 12.5%, petroleum resin C9 5%, ethyl cyclohexane 66.95%, silicone leveling agent 3%, blue toner 0.05%.

[0074] II. Performance test of peelable blue glue for touch screen

[0075] The viscosity, surface drying time, and complete curing time of the peelable blue glue for touch screen in Examples 5 - 8 and Comparative Examples 5 - 8 were tested, and the shrinkage of each peelable blue glue for touch screen during the test was recorded.

[0076] Table 2 Performance test of peelable blue glue for touch screen in Examples 5 - 8 and Comparative Examples 5 - 8

[0077] Test items Viscosity (CPS) Surface drying time (min) Full curing time (min) Degree of shrinkage Example 5 415 7-9 59 Slight shrinkage Example 6 407 6-8 56 Slight shrinkage Example 7 410 7-9 57 Slight shrinkage Example 8 405 7-9 53 Slight shrinkage Comparative example 5 570 10-12 Greater than 80 Severe shrinkage Comparative example 6 595 10-12 Greater than 80 Severe shrinkage Comparative example 7 580 10-12 Greater than 80 Severe shrinkage Comparative example 8 560 10-12 Greater than 80 Severe shrinkage

[0078] As can be seen from Table 2, using different thermoplastic elastomers in Examples 5 - 8 can effectively improve the shrinkage effect, but the shrinkage prevention effect is slightly worse than that of thermoplastic elastomer SEBS. At the same time, by comparing Examples 5 - 8 and Comparative Examples 5 - 8, it can be seen that the combined use of solvents in the examples is faster in surface drying time and complete curing time than the single solvent in the comparative examples, indicating that the solvent blending in Examples 5 - 8 can effectively improve the drying efficiency.

[0079] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non - substantial changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. A peelable blue glue for anti-shrinkage touch screen, characterized by: The invention comprises the following components in percentage by mass: 5-20% of thermoplastic elastomer, 10-15% of tackifying resin, 60-70% of solvent, 1-5% of leveling agent and 0.01-0.1% of blue color powder.

2. The anti-shrinkage touch screen peelable blue glue according to claim 1, characterized in that: The thermoplastic elastomer is at least one selected from styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, and styrene-ethylene-propylene-styrene type block copolymer.

3. The peelable blue glue for the anti-shrinkage touch screen according to claim 1 or 2, characterized in that: The tackifying resin is selected from at least one of petroleum resin, rosin resin and terpene resin.

4. The peelable blue glue for the anti-shrinkage touch screen according to claim 3 is characterized by: The solvent is selected from at least one of ethylcyclohexane, methylcyclohexane, cyclohexane and xylene.

5. The peelable blue glue for the anti-shrinkage touch screen according to claim 3 is characterized by: The leveling agent is a silicone leveling agent or an acrylate leveling agent.

6. The peelable blue glue for the anti-shrinkage touch screen according to claim 3, characterized in that: The blue toner is phthalocyanine blue.

7. The peelable blue glue for the anti-shrinkage touch screen according to claim 3, characterized in that: The anti-shrinkage touch screen peelable blue glue comprises the following components in percentage by mass: 7-20% of thermoplastic elastomer, 10-13% of tackifying resin, 65-68% of solvent, 2-4% of leveling agent and 0.03-0.07% of blue color powder.

8. The peelable blue glue for the anti-shrinkage touch screen according to claim 3, characterized in that: The anti-shrinkage touch screen peelable blue glue comprises the following components in percentage by mass: 20% of thermoplastic elastomer, 10% of tackifying resin, 66.95% of solvent, 3% of leveling agent and 0.05% of blue color powder.

9. A method for preparing a peelable blue adhesive for a shrink-proof touch screen as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. According to the formula, put the thermoplastic elastomer, tackifying resin and solvent into a planetary stirring kettle at a stirring speed of 700-1200rpm, a dispersion speed of 1000-1500rpm, and a stirring time of 1-3h until the materials are fully dissolved; S2. Add blue toner and leveling agent, increase the stirring speed to 1300-1500rpm, the dispersion speed to 1500-1800rpm, the stirring time to 0.5-1h, and discharge the material after the sampling test is qualified.

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