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A kind of thermoplastic polyurethane elastomer for keyboard film and preparation method thereof

A technology of thermoplastic polyurethane and polyurethane elastomer, which is applied in the field of polyurethane elastomer and its preparation, can solve the problems of rare polyurethane elastomer and achieve excellent yellowing resistance

Active Publication Date: 2017-08-29
DONGGUAN JIXIN POLYMER SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, research on polyurethane elastomers for keyboard membranes is still rare, and the present invention aims to provide relevant research in this area

Method used

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  • A kind of thermoplastic polyurethane elastomer for keyboard film and preparation method thereof
  • A kind of thermoplastic polyurethane elastomer for keyboard film and preparation method thereof
  • A kind of thermoplastic polyurethane elastomer for keyboard film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A thermoplastic polyurethane elastomer used for keyboard membranes, containing the following components by mass percentage:

[0053] Polyethylene Glycol 35%

[0054] Toluene diisocyanate 19%

[0055] Butanediol 30%

[0056] Epoxy 5%

[0057] Phosphite without benzene ring 1%

[0058] UV absorber 5%

[0059] Hydrogen silicone oil 5%; prepared as follows:

[0060] (1) Add phenolic resin to polyethylene glycol, vacuumize and dehydrate under 0.5kPa vacuum at 70°C;

[0061] (2) Dehydrate butanediol at 95°C under 0.2kPa vacuum; melt toluene diisocyanate at 68°C;

[0062] (3) Mix the mixture obtained in step (1) with the dehydrated butanediol in step (2) and heat at 90°C for 0.5h;

[0063] (4) Mix the toluene diisocyanate melted in step (2) with the mixture obtained in step (3) and other components, stir at 150°C for 3h, and then mature at 90°C for 12h;

[0064] (5) Granulating and injection molding the product obtained in step (4) to obtain the polyurethane elastomer. ...

Embodiment 2

[0066] A thermoplastic polyurethane elastomer used for keyboard membranes, containing the following components by mass percentage:

[0067] Polyethylene glycol 24%

[0068] Toluene diisocyanate 25%

[0069] Butanediol 20%

[0070] Epoxy 20%

[0071] Phosphite without benzene ring 5%

[0072] UV absorber 3%

[0073] Hydrogen silicone oil 3%; prepared as follows:

[0074] (1) Add phenolic resin to polyethylene glycol, vacuumize and dehydrate at 80°C under 0.2kPa vacuum;

[0075] (2) Dehydrate butanediol at 85°C under 0.5kPa vacuum; melt toluene diisocyanate at 57°C;

[0076] (3) Mix the mixture obtained in step (1) with the dehydrated butanediol in step (2) and heat at 80° C. for 1 hour;

[0077] (4) Mix the toluene diisocyanate melted in step (2) with the mixture obtained in step (3) and other components, stir at 155°C for 0.5h, and then mature at 85°C for 20h;

[0078] (5) Granulating and injection molding the product obtained in step (4) to obtain the polyurethane ela...

Embodiment 3

[0080] A thermoplastic polyurethane elastomer used for keyboard membranes, containing the following components by mass percentage:

[0081] Polyethylene Glycol 35%

[0082] Toluene diisocyanate 20%

[0083] Butanediol 10%

[0084] Epoxy 15%

[0085] Phosphite without benzene ring 3%

[0086] UV absorber 1%

[0087] Hydrogen silicone oil 2% and talc filler 14%; prepared by the following method:

[0088] (1) Add phenolic resin to polyethylene glycol, vacuumize and dehydrate at 75°C under 0.4kPa vacuum;

[0089] (2) dehydrating butanediol at 90°C under 0.3kPa vacuum; melting toluene diisocyanate at 60°C;

[0090] (3) Mix the mixture obtained in step (1) with the dehydrated butanediol in step (2) and heat at 85° C. for 2 hours;

[0091] (4) Mix the toluene diisocyanate melted in step (2) with the mixture obtained in step (3) and other components, stir at 145°C for 3h, and then mature at 95°C for 30h;

[0092] (5) Granulating and injection molding the product obtained in st...

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Abstract

A TPU (thermoplastic polyurethane) elastomer for a keyboard film comprises components in percentage by mass as follows: 20-35% of polyethylene glycol, 10-25% of toluene diisocyanate, 10-30% of butanediol, 5-20% of epoxy resin, 1-5% of benzene-ring-free phosphite ester, 1-5% of an ultraviolet light absorber and 1-5% of hydrogen-containing silicone oil. A preparation method of the elastomer comprises the steps as follows: (1) dehydrating the polyethylene glycol; (2) dehydrating the butanediol, and melting the toluene diisocyanate; (3) mixing and heating a mixture obtained in Step (1) and the butanediol dehydrated in Step (2); (4) mixing, heating, stirring and then curing the toluene diisocyanate molten in Step (2), a mixture obtained in Step (3) and other components, and granulating and injection-molding a product to obtain the polyurethane elastomer. The elastomer is transparent, good in elasticity, better in yellowing resistance and higher in tensile strength.

Description

technical field [0001] The invention relates to a polyurethane elastomer and a preparation method thereof, in particular to a thermoplastic polyurethane elastomer used for keyboard membranes and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane (Thermoplastic polyyrethane, TPU) is a new type of organic polymer synthetic material, which belongs to the chemical compound, and its English trade name is: Flexible polyurethane. PVC. For example, it has excellent physical properties, such as wear resistance and resilience, which are better than ordinary polyurethane and PVC, and aging resistance is better than rubber. It can be said to be the most ideal material to replace PVC and PU. It is called a new polymer material internationally. . [0003] Thermoplastic polyurethane is widely used, for example, it can be used for fabrics and inner lining materials of footwear such as sports shoe logo, sports shoe air cushion, mountaineering shoes, snow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/58C08K5/523C08K5/3475
CPCC08G18/3206C08G18/4045C08G18/4825C08G18/58C08G18/6674C08G18/7614C08K5/3475C08K5/524
Inventor 何建雄王一良
Owner DONGGUAN JIXIN POLYMER SCI & TECH
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