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Detachable reactive polyurethane hot melt adhesive used for bonding of mobile phone frames and preparation method of adhesive

A hot-melt adhesive and mobile phone frame technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the difficulty of bonding mobile phone frames, increase the difficulty of bonding, waste raw materials, etc. problem, to achieve the effect of high bond strength, short holding time and smooth dispensing

Pending Publication Date: 2019-07-16
康达新材料(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, the application of various new materials not only increases the difficulty of bonding, but also increases the cost of the new materials themselves.
[0006] Based on the above, in the production of new electronic equipment, the difficulty of bonding the frame of the mobile phone due to new materials and new processes has been greatly increased, which will inevitably lead to an increase in the defect rate, resulting in waste of raw materials and an increase in cost

Method used

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  • Detachable reactive polyurethane hot melt adhesive used for bonding of mobile phone frames and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 18.7 parts of polyether polyol, 44.8 parts of polyester polyol, 13.1 parts of acrylic resin, 3.3 parts of tackifying resin, 2.2 parts of TPU, and 0.1 part of phosphoric acid agent into the reactor and heat it to 140°C. Dissolve completely, stir evenly, vacuum and dehydrate, heat and vacuum for 60min, keep the vacuum at -0.1Mpa; cool down to 110℃, vent with nitrogen, add 15.1 parts of pure MDI, keep at 120℃ for 80min, add DMDEE0.2 after nitrogen vent And 2.5 parts of adhesion promoter, continue to keep the temperature at 120°C, react for 45min with the vacuum degree of -0.1Mpa, and then vent the material with nitrogen gas to obtain the removable reactive polyurethane hot-melt adhesive for bonding mobile phone frames.

Embodiment 2

[0040] Weigh 17.4 parts of polyether polyol, 40.6 parts of polyester polyol, 17.4 parts of acrylic resin, 4.6 parts of tackifying resin, 1.2 parts of TPU, and 0.1 part of phosphoric acid agent into the reactor, heat to 140℃, and wait for the solid materials in it Dissolve completely, stir evenly, vacuum and dehydrate, heat and vacuum for 60min, keep the vacuum at -0.1Mpa; cool to 110℃, vent with nitrogen, add 16.3 parts of pure MDI, keep at 120℃ for 80min, add DMDEE0.2 after venting with nitrogen 2. The adhesion promoter is 2.2 parts, the temperature is kept at 120℃, the vacuum degree is -0.1Mpa, and the reaction is 45min, and then the nitrogen is discharged to obtain the removable reactive polyurethane hot melt adhesive for the bonding of mobile phone frame.

Embodiment 3

[0042] Weigh 19.7 parts of polyether polyol, 38.8 parts of polyester polyol, 18.5 parts of acrylic resin, 3.8 parts of tackifying resin, and 0.1 part of phosphoric acid agent into the reactor, heat to 140℃, wait until the solid materials in it are completely melted, and stir evenly After vacuum dehydration, heat preservation and vacuum for 60min, the vacuum degree is kept -0.1Mpa; the temperature is reduced to 110℃, nitrogen is vented, 16.7 parts of pure MDI is added, 120℃ is kept and reacted for 80min, after nitrogen is vented, 0.2 part of DMDEE is added to promote adhesion Add 2.5 parts, continue to keep the temperature at 120°C, react for 45 minutes with a vacuum of -0.1Mpa, and then vent the material with nitrogen to obtain a removable reactive polyurethane hot-melt adhesive for bonding mobile phone frames.

[0043] The test performance results in Examples 1 to 3 are shown in Table 1:

[0044] Table 1: Performance test comparison of detachable reactive polyurethane hot melt adh...

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Abstract

The invention discloses a detachable reactive polyurethane hot melt adhesive used for bonding of mobile phone frames. The adhesive is characterized by comprising the following components, in percentages by weight: 10-30% of a polyether polyol, 30-50% of a polyester polyol, 15-35% of isocyanate, 15-30% of acrylic resin, 3-10% of tackifying resin, 1-5% of thermoplastic polyurethane (TPU), 0.1-0.5% of a stabilizing agent, 0.1-1% of a catalyst, and 1-5% of an adhesion promoter. The invention also discloses a preparation method of the adhesive. The reactive polyurethane hot melt adhesive provided by the invention has low viscosity, good fluidity, easy dispensing and no drawing; the adhesive has good stability, and the viscosity change does not exceed 50% at 120 DEG C for 24 h; the adhesive hasa fast positioning speed and short pressure holding time; the adhesive has high bonding strength and very good bonding effects on a plurality of plastics and metals; and the adhesive is detachable.

Description

Technical field [0001] The invention belongs to the field of polyurethane adhesives, and specifically relates to a detachable reactive polyurethane hot-melt adhesive for bonding mobile phone frames and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, smart phones, tablet computers and smart wearable devices (such as smart watches, bracelets, etc.) are updated rapidly. Various novel product structures have given birth to the application of many new materials. The contact surface between the screen and the frame is getting narrower and narrower, and mobile phones are especially prominent. With the trend of lighter and thinner mobile phones, the bonding requirements of the screen and the frame are becoming more and more challenging. [0003] At present, many companies have the ability to develop reactive polyurethane hot melt adhesives with conventional properties. Some of the properties are quite outstanding. The fore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C09J133/04C09J175/04C09J11/08C08G18/76C08G18/48C08G18/42
CPCC08G18/4018C08G18/42C08G18/48C08G18/7671C08L2205/02C08L2205/035C09J11/08C09J175/06C09J175/08C08L33/04C08L75/04
Inventor 从赫雷方俊郎逸超程瑶汪维乔勇杰
Owner 康达新材料(集团)股份有限公司
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