Reactive polyurethane hot melt adhesive for shading round hole of mobile phone and preparation method ofhot melt adhesive

A polyurethane hot-melt adhesive, reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of being located on both sides or directly above the mobile phone screen, large space, etc., and achieve a good initial stage. Strength, effect of good aging resistance

Active Publication Date: 2021-04-06
WUXI WANLI ADHESION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The front cameras and earpieces of conventional and narrow-frame mobile phones are usually located on both sides or directly above the mobile phone screen, occupying a large space

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1 of the present invention specifically provides a reactive polyurethane hot-melt adhesive for shading the round hole of a mobile phone. The raw materials of the polyurethane hot-melt adhesive include, in parts by weight, 52 parts of polyol, 17 parts of tackifying resin, anti- 0.7 parts of oxygen agent, 10 parts of opacifying agent, 18.5 parts of aromatic isocyanate, 0.05 parts of catalyst, and 1.55 parts of silane coupling agent.

[0072] Described polyol is the mixture of polyester polyol and polyether polyol, and the weight ratio of described polyester polyol and polyether polyol is 1.36: 1; Described polyester polyol is crystalline polyester polyol; The average molecular weight of the crystalline polyester polyol is 3000; the average molecular weight of the polyether polyol is 1000; the crystalline polyester polyol is Evonik Dynacoll7360; the polyether polyol is DOW VORANOL 2000LM.

[0073] Described tackifying resin is 2978 of Mitsubishi of Japan.

[00...

Embodiment 2

[0082] Embodiment 2 of the present invention specifically provides a reactive polyurethane hot-melt adhesive for shading the round hole of a mobile phone. The raw materials of the polyurethane hot-melt adhesive include, in parts by weight, 49 parts of polyol, 18 parts of tackifying resin, anti- 0.8 parts of oxygen agent, 10 parts of opacifying agent, 18.9 parts of aromatic isocyanate, 0.05 parts of catalyst, and 1.45 parts of silane coupling agent.

[0083] Described polyol is the mixture of polyester polyol and polyether polyol, and the weight ratio of described polyester polyol and polyether polyol is 1.57: 1; Described polyester polyol is crystalline polyester polyol; The average molecular weight of the crystalline polyester polyol is 6000; the average molecular weight of the polyether polyol is 2500; the crystalline polyester polyol is Evonik Dynacoll7360; the polyether polyol is DOW VORANOL 2000LM.

[0084] Described tackifying resin is 2978 of Mitsubishi of Japan.

[00...

Embodiment 3

[0093] Embodiment 3 of the present invention specifically provides a reactive polyurethane hot-melt adhesive for shading the round hole of a mobile phone. The raw materials of the polyurethane hot-melt adhesive include, in parts by weight, 55 parts of polyol, 19 parts of tackifying resin, anti- 0.8 parts of oxygen agent, 10 parts of opacifying agent, 18 parts of aromatic isocyanate, 0.05 parts of catalyst, and 1.4 parts of silane coupling agent.

[0094] Described polyol is the mixture of polyester polyol and polyether polyol, and the weight ratio of described polyester polyol and polyether polyol is 1.5: 1; Described polyester polyol is crystalline polyester polyol; The average molecular weight of the crystalline polyester polyol is 4000; the average molecular weight of the polyether polyol is 2000; the crystalline polyester polyol is Evonik Dynacoll7360; the polyether polyol is DOW VORANOL 2000LM.

[0095] Described tackifying resin is 2978 of Mitsubishi of Japan.

[0096] ...

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Abstract

The invention relates to the technical field of reactive polyurethane hot melt adhesives, in particular to a reactive polyurethane hot melt adhesive for shading a round hole of a mobile phone and a preparation method of the reactive polyurethane hot melt adhesive. The polyurethane hot melt adhesive is prepared from the following raw materials in parts by weight: 30 to 65 parts of polyhydric alcohol, 10 to 40 parts of tackifying resin, 0.1 to 1 part of antioxidant, 5 to 15 parts of opacifying agent, 10 to 35 parts of aromatic isocyanate, 0.01 to 0.1 part of a catalyst and 1 to 2 parts of a silane coupling agent. The hot melt adhesive provided by the invention has high shading property and aging resistance.

Description

technical field [0001] The invention relates to the technical field of reactive polyurethane hot-melt adhesives, in particular to a reactive polyurethane hot-melt adhesive for light-shielding round holes of mobile phones and a preparation method thereof. Background technique [0002] Nowadays, full-screen mobile phones have become the mainstream, and major mobile phone manufacturers are trying their best to expand the screen-to-body ratio and improve the new full-screen design. In the process, "water drop screen", "notch screen" and "digging Hole screen" and so on. The front cameras and earpieces of conventional and narrow-frame mobile phones are usually located on both sides or directly above the screen of the mobile phone, occupying a large space. In order to expand the screen-to-body ratio, it is necessary to reduce the space occupied by the camera and earpiece, and less glue is required to bond the camera and block light. Such a thin and light adhesive layer requires a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C09J11/06C09J11/08
CPCC09J175/04C09J11/04C09J11/06C09J11/08C08K2201/011C08L2203/20C08L33/066C08K13/02C08K3/04C08K5/1345C08K5/5435C08K5/5425C08K5/053
Inventor 徐彬彬
Owner WUXI WANLI ADHESION MATERIALS
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