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Waterborne polyurethane resin emulsion, preparation method and earphone cover leather

A water-based polyurethane and resin emulsion technology, which is applied in the field of water-based polyurethane, can solve the problems of narrow processing range, inability to meet the high-frequency processing performance requirements of earphone cover leather, and low strength.

Pending Publication Date: 2022-04-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane obtained by this process has a small molecular weight and low strength, and the practical processing range is narrow. It can only be processed by using a mold in a viscous flow state, which cannot meet the high-frequency processing performance requirements of earphone cover leather.

Method used

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  • Waterborne polyurethane resin emulsion, preparation method and earphone cover leather
  • Waterborne polyurethane resin emulsion, preparation method and earphone cover leather
  • Waterborne polyurethane resin emulsion, preparation method and earphone cover leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dehydrate 100g (0.05mol) of polytetrahydrofuran ether polyol (molecular weight: 2000) at 105°C for 1 hour, then cool down to 50°C, add 40g (0.15mol) of dicyclohexylmethane diisocyanate, heat up to 90°C and keep warm for reaction 3 Hours, measure NCO content, reach theoretical value 6.16, then cool down to 50°C, then add 6g (0.04mol) dimethylol butyric acid, 1.48g (0.01mol) lysine to react at 80°C for 2h, cool down to 50°C, then add 0.2g organic bismuth Coscat83 and 2.3g (0.008mol) And add 10ml of acetone to adjust the viscosity, react at 70°C for 2.5h, then cool down to 0°C, add 3.5g of triethylamine for neutralization, after neutralization for 10min, add 350g of deionized water under high-speed shear at 1500rpm, and disperse for 7min , the final NCO value was 1.7, and the acetone and part of the water in the system were distilled off under reduced pressure to obtain an aqueous polyurethane resin emulsion 1 with a solid content of 35%.

Embodiment 2

[0051] Dehydrate 50g (0.035mol) of polytetrahydrofuran ether polyol (molecular weight: 1500) and 50g (0.02mol) of polypropylene oxide polyol (molecular weight: 2500) at 110°C for 1h, then cool down to 50°C, add 35g ( 0.14mol) of diphenylmethane diisocyanate, heat up to 90°C for 3 hours, measure the NCO content, after reaching a theoretical value of 10.43, cool down to 50°C, then add 4g (0.03mol) dimethylol butyric acid, 1.2g (0.008mol) lysine was reacted at 75°C for 2h, cooled to 50°C, and then 0.2g organic bismuth Coscat83 and 1.5g (0.006mol) And add 8ml of acetone to adjust the viscosity, react at 70°C for 2.5h, then cool down to 0°C, add 4g of triethylamine for neutralization, after neutralization for 10min, add 325.7g of deionized water under high-speed shear at 1500rpm, and disperse for 5min , the final NCO value was 1.7, and the acetone and part of the water in the system were distilled off under reduced pressure to obtain an aqueous polyurethane resin emulsion 2 with a...

Embodiment 3

[0053] Dehydrate 85g (0.043mol) of polypropylene oxide polyol (molecular weight: 2000) at 100°C for 2 hours, then cool down to 50°C, add 30g (0.115mol) of dicyclohexylmethane diisocyanate, heat up to 85°C and keep it warm for reaction After 3.5 hours, measure the NCO content, cool down to 50°C after reaching the theoretical value of 5.26, then add 2.5g (0.019mol) of dimethylol butyric acid, 2g (0.014mol) of lysine and react at 75°C for 2h, then cool down to 50°C, then add 0.25g organic bismuth Coscat83 and 1.2g And add 4ml of acetone to adjust the viscosity, react at 75°C for 2h, then cool down to 0°C, add 2.5g of triethylamine for neutralization, after neutralization for 10min, add 299.8g of deionized water under high-speed shear at 1500rpm, and disperse for 10min , the final NCO value was 1.60, and the acetone and part of the water in the system were distilled off under reduced pressure to obtain an aqueous polyurethane resin emulsion 3 with a solid content of 32%.

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Abstract

The invention discloses a waterborne polyurethane resin emulsion, a preparation method and earphone cover leather. The waterborne polyurethane resin emulsion is prepared from the following raw materials: 50 to 80 parts of polyol, 10 to 35 parts of polyisocyanate, 1 to 7 parts of hydrophilic chain extender, 0.5 to 3 parts of DA compound containing dihydroxyl, 0.5 to 2 parts of amino acid chain extender, 0.01 to 0.5 part of catalyst and 1 to 5 parts of salt-forming agent. Water-based polyurethane resin is modified, a DA compound is introduced into post-chain extension through formula design, a polyurethane main chain is broken at high temperature, the molecular weight is reduced, the resin can meet the specific high-frequency processing performance of the earphone sleeve, when normal temperature is recovered, a DA bond is recovered, a leather sample contact surface generates certain crosslinking, the interface peeling strength is improved, and the service life of the earphone sleeve is prolonged. Meanwhile, reactive groups are increased by introducing amino acid as a front chain extender, and the crosslinking degree of the resin is improved by adding an aziridine curing agent during application, so that the resin has extremely high alcohol wiping resistance.

Description

technical field [0001] The invention relates to the field of water-based polyurethane, in particular to a water-based polyurethane resin that can be used for the leather surface layer of earphone covers and a preparation method thereof. Background technique [0002] With the widespread use of electronic devices such as mobile phones and computers, e-sports activities are becoming more and more active, and the demand for earphones in the market has skyrocketed. At the same time, the quality requirements for earphones are also getting higher and higher. Leather earphone covers are sought after by consumers due to their high comfort, and synthetic leather has also developed as a substitute for genuine leather. [0003] At present, the resin used to prepare the surface layer of earphone cover leather is basically oily resin. The main reason is due to the high standard of the earphone cover leather. For the production process, due to the shaping requirements of the earphone cover...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/12C08G18/10C08G18/34C08G18/67D06N3/14
CPCC08G18/6692C08G18/4804C08G18/4854C08G18/48C08G18/10C08G18/12C08G18/678C08G18/6765D06N3/146C08G18/348C08G18/34Y02P70/62
Inventor 孙小鹏李卫飞
Owner WANHUA CHEM GRP CO LTD
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