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Preparation method of high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller

A polyurethane water dispersion and nanofiller technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low solid content, poor damping performance and narrow temperature range of waterborne dispersions, and achieve stable storage and surface energy. High and wide range of effects

Inactive Publication Date: 2013-06-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical status of preparing damping materials in the prior art, the present invention aims to provide a method for preparing a high-solid-content wide-temperature-range damping polyurethane aqueous dispersion containing nano-fillers by using organic-inorganic hybrid technology, copolymerization modification technology, etc. Solve a series of problems such as low solid content (30%~40%), poor damping performance (tanδ<0.3) and narrow temperature range (about 40°C~50°C) of the existing damping polyurethane aqueous dispersion

Method used

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  • Preparation method of high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 122g of PTMG 3k and 30.06g of PD-56 and dehydrate at a vacuum degree of 0.08MPa and a temperature of 110°C for 55min, then cool the system to 35°C and add 55.58g of IPDI, and react at a temperature of 88°C for 60min to obtain a polyurethane prepolymer (a ); add 9.39g DMPA and 25g dimethylformamide, add 5.9g of triethylamine after temperature control 85 ℃ and continue to react for 90min, obtain water dispersible polyurethane prepolymer (b); Weigh 160g deionized water, 1.8g External emulsifier OP-10, 2.0g coupling agent KH-560, 21g nano-silicon dispersion (50%) R1050, mix evenly, disperse polyurethane prepolymer (b) in it under stirring state, add 1.5g dropwise after 30min The mixture of n-butylamine and 4.2 g of ethylenediamine was stirred for 150 min to obtain dispersion 1 with a solid content of about 52.1%.

Embodiment 2

[0037] Weigh 120g of PCDL 3k and 30.5g of PD-56 and dehydrate for 45min at a vacuum degree of 0.075MPa and a temperature of 120°C, then cool the system down to 35°C and add a mixture of 23.50g of HDI and 32.00g of HMDI, and react at a temperature of 75°C for 110min to obtain Polyurethane prepolymer (a); add 9.39g DMPA and 30g dimethylformamide, control the temperature at 80°C and continue to react for 130min, then add 6.1g of triethylamine to obtain water dispersible polyurethane prepolymer (b); weigh 150g Deionized water, 1.7g external emulsifier OP-10, 2.1g coupling agent KH-560, 28g nano-silicon dispersion (50%) R1050 are mixed evenly, and the polyurethane prepolymer (b) is dispersed in it under stirring. After 30 minutes, a mixture of 1.5 g of n-butylamine and 4.2 g of ethylenediamine was added dropwise, and stirring was continued for 150 minutes to obtain dispersion 2 with a solid content of about 53.3%.

Embodiment 3

[0039] Weigh 118g of PTMG 3k and 29.5g of PH-56 and dehydrate for 35min at a vacuum of 0.07MPa and a temperature of 125°C, then cool the system down to 35°C and add a mixture of 29.24g of HDI and 20.9g of HMDI, and react at a temperature of 80°C for 70min to obtain Polyurethane prepolymer (a); add 9.76g DMPA and 20g dimethylformamide, control the temperature at 90°C and continue to react for 70min, then add 6.5g of triethylamine to obtain water dispersible polyurethane prepolymer (b); weigh 130g Deionized water, 1.9g external emulsifier OP-10, 1.9g coupling agent KH-550, 37g nano-silicon dispersion (50%) R1050 are mixed evenly, and the polyurethane prepolymer (b) is dispersed in it under stirring, After 30 minutes, a mixture of 0.5 g of n-butylamine, 3.2 g of ethylenediamine and 1.05 g of diethylenetriamine was added dropwise, and stirring was continued for 150 minutes to obtain a dispersion 3 with a solid content of about 55.6%.

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Abstract

The invention discloses a preparation method of a high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller. The preparation method mainly comprises the following steps of: combining polyhydric alcohols and isocyanate to prepare a polyurethane prepolymer (a); preparing an emulsifiable polyurethane prepolymer by using a hydrophilic chain extender (b); and neutralizing and emulsifying, then carrying out secondary chain extension and nanometer hybridization to obtain the aqueous dispersion. The olyurethane dispersion disclosed by the invention is in line with environmental requirements of modern industries by taking water as a dispersion medium, has good storage stability and is simple and practicable in a preparative technology. Compared with a conventional waterborne polyurethane aqueous dispersion, the high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller has super-high solid content of 50%-60% and high damping behavior (tan delta greater than 0.3) in a wide-temperature range of -50 DEG C to 90 DEG C. The high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller is an environment-friendly functional polyurethane damping material and can be widely applied to various fields of national economy such as aerospace, automobiles, ship building, precise instruments, architectural ornaments and the like.

Description

technical field [0001] The invention relates to the preparation of a high-solid-content wide-temperature-range damping polyurethane water dispersion, in particular to a preparation method of a high-solid-content wide-temperature-range damping polyurethane water dispersion which can be used in coating compositions and contains nano fillers. technical background [0002] Damping material is a functional material that can absorb vibration mechanical energy and convert it into heat energy and dissipate it. The damping vibration reduction and noise reduction technology uses the principle that the damping material converts kinetic energy into heat energy when it deforms, which can reduce various types of mechanical energy. Vibration and noise, improve the precision and life of machinery, and eliminate environmental pollution caused by vibration and noise. There are many types of damping materials, which can be summarized as follows: polymer damping materials, high damping alloys, ...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08L75/08C08K9/06C08K3/36C08K3/22C08K3/26C08K3/34C08G18/34C08G18/32C08G18/12C09D175/06C09D175/08C09D7/12
Inventor 辛中印陈政董伟韩颜庭
Owner SICHUAN UNIV
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