Fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and preparation method thereof

A technology of polybutadiene and sound-transmitting materials, which is applied in the field of fluorosilane-modified polybutadiene-type polyurethane underwater sound-transmitting materials and its preparation, and can solve the problem of poor water resistance and water tightness and low comprehensive mechanical properties , water resistance and low surface tension, to achieve the effect of good cold resistance and sound permeability, good chemical stability and strong hydrophobicity

Inactive Publication Date: 2019-06-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of existing polyurethane underwater acoustic materials such as low comprehensive mechanical properties, poor water resistance and water tightness, the purpose of the present invention is to provide a soft polybutadiene that uses polybutadiene with strong hydrophobicity and good water resistance as polyurethane. At the same time, polytrifluoropropylmethylsiloxane and perfluorodecyltrimethoxysilane with strong oil resistance, water resistance and low surface tension were introduced as modified material

Method used

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  • Fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and preparation method thereof
  • Fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and preparation method thereof
  • Fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027]1) Add 130g of hydroxyl-terminated polybutadiene, 7.742g of polytrifluoropropylmethylsiloxane and 0.078g of perfluorodecyltrimethoxysilane into a three-necked flask equipped with a stirrer and a thermometer, and heat up to 105 ℃, dehydration under vacuum for 1h, until the test moisture content is lower than 0.05%, then cooled to 40~50℃, after adding 1 drop of catalyst, slowly added 26.07g of toluene diisocyanate, after the system naturally heated up, slowly heated to (80±5 )°C, the prepolymer was obtained after the insulation reaction.

[0028] 2) After adding 32.78g of reactive diluent, stir for 15min, vacuum defoam for 10min, add 17.74g of chain extender, stir quickly and evenly, vacuum defoam for 2min, pour into the mold coated with release agent, and vulcanize at room temperature for one week.

[0029] The resulting fluorosilane-modified polybutadiene polyurethane has a density of 1035kg / m 3 , the characteristic acoustic impedance is 1.559×10 5 g / (cm 2 ·s), the lo...

Embodiment 2

[0031] 1) Add 130g of hydroxyl-terminated polybutadiene, 7.585g of polytrifluoropropylmethylsiloxane and 0.235g of perfluorodecyltrimethoxysilane into a three-necked flask equipped with a stirrer and a thermometer, and heat up to 105 ℃, dehydration under vacuum for 1h, until the test moisture content is lower than 0.05%, then cooled to 40~50℃, after adding 1 drop of catalyst, slowly added 26.07g of toluene diisocyanate, after the system naturally heated up, slowly heated to (80±5 )°C, the prepolymer was obtained after the insulation reaction.

[0032] 2) After adding 32.78g of reactive diluent, stir for 15min, vacuum defoam for 10min, add 17.74g of chain extender, stir quickly and evenly, vacuum defoam for 2min, pour into the mold coated with release agent, and vulcanize at room temperature for one week.

[0033] The resulting fluorosilane-modified polybutadiene polyurethane has a density of 1027kg / m 3 , the characteristic acoustic impedance is 1.542×10 5 g / (cm 2 ·s), the l...

Embodiment 3

[0035] 1) Add 130g of hydroxyl-terminated polybutadiene, 7.429g of polytrifluoropropylmethylsiloxane and 0.391g of perfluorodecyltrimethoxysilane into a three-necked flask equipped with a stirrer and a thermometer, and heat up to 105 ℃, dehydration under vacuum for 1h, until the test moisture content is lower than 0.05%, then cooled to 40~50℃, after adding 1 drop of catalyst, slowly added 26.07g of toluene diisocyanate, after the system naturally heated up, slowly heated to (80±5 )°C, the prepolymer was obtained after the insulation reaction.

[0036] 2) After adding 32.78g of reactive diluent, stir for 15min, vacuum defoam for 10min, add 17.74g of chain extender, stir quickly and evenly, vacuum defoam for 2min, pour into the mold coated with release agent, and vulcanize at room temperature for one week.

[0037] The resulting fluorosilane-modified polybutadiene polyurethane has a density of 1029kg / m 3 , the characteristic acoustic impedance is 1.541×10 5 g / (cm 2 s), the lo...

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Abstract

The invention discloses a fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and a preparation method thereof. The fluorosilane modified polybutadiene typepolyurethane underwater acoustic transmission material is prepared from perfluor decyl triethoxy silane, polytrifluoro-propyl methylsiloxane, hydroxyl-terminated polybutadien, isocyanate, a chain extender and an active diluent as raw materials by using a prepolymer method. The fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material has excellent water resistance, acoustic transmission performance and comprehensive mechanical properties, and can be widely applied to underwater acoustic transmission sealing of exploration devices such as acoustic transmission windows, underwater acoustic transducers, submarine oil exploration, marine fishing and ship underwater sonar.

Description

technical field [0001] The invention relates to an underwater acoustic material, in particular to a hydrophobic material obtained by using perfluorodecyltrimethoxysilane and polytrifluoropropylmethylsiloxane as modified materials and polybutadiene as a soft segment. Polybutadiene polyurethane underwater sound-permeable material with high strength, high water resistance, good cold resistance and sound permeability, which can be used for underwater detection such as underwater acoustic transducers, seabed oil exploration, marine fishing, and sonar devices The potting material of the device belongs to the technology in the field of underwater acoustic materials. Background technique [0002] Hydroacoustic materials refer to acoustic materials used under external pressure in a water environment. With the continuous development of submarines, underwater weapons and other underwater acoustic systems, underwater acoustic materials have become an important field of new material res...

Claims

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Application Information

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IPC IPC(8): C08L75/14C08L83/08C08K5/5419C08G18/69C08G18/76
Inventor 李芝华沈玉婷
Owner CENT SOUTH UNIV
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