Low-density polyurethane gel composition

A technology of polyurethane gel and composition, applied in the field of low-density polyurethane gel composition, can solve the problems of low viscoelasticity, low viscosity coefficient, low specific gravity and the like of light wax oil, so as to overcome the problems of low viscoelasticity and high viscoelasticity , the effect of good sound permeability

Inactive Publication Date: 2003-03-12
MARINE CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its small viscosity coefficient, the effect of vibration isolation and vibration reduction is not ideal, which affects the measurement accuracy of underwater acoustic devices; in addition, when the sheath is damaged, it is easy to cause the loss of light wax oil, and seawater will corrode the corresponding electrical components adverse consequences of
[0004] In order to solve this problem, the present invention provides a new polyurethane material, which is a jelly-like low-density gel material, which can be used for vibration and noise reduction treatment of underwater acoustic devices, especially towed line array sonar The application of the wet end sheath, this new material retains the original sound permeability, low specific gravity and low temperature non-freezing advantages of light wax oil, overcomes the shortcomings of light wax oil with low viscoelasticity and easy damage and loss, and further satisfies Requirements for filling materials at the wet end of the towed line train sonar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 100 parts of 2,4-toluene diisocyanate, 547 parts of polypropylene glycol with a molecular weight of 1000, 800 parts of 0# aviation kerosene, 170 parts of dibutyl phthalate, 5 parts of dibutyltin dilaurate, 1,6-hexa 5 parts of methylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), mix the above components evenly, cast in the mold, solidify after 2 days, and reach the best strength after 14 days, the obtained The specific gravity of low-density polyurethane gel is 0.85g / cm 3 , the Shore A hardness is 5, the elongation at break is 80%, and in the range of -40°C to +50°C, tanδ>0.3.

Embodiment 2

[0031] Get carbodiimide modified liquefied MDI100 parts, molecular weight is 530 parts of polyoxypropylene trihydric alcohols of 3000, 1000 parts of 90# gasoline, 260 parts of light wax oils, 6 parts of phenylmercury acetates, two (2,2,6 , 6 parts of 6-tetramethyl-4-piperidinyl) sebacate, mix the above components evenly, cast in the mold, solidify after 2 days, and reach the best strength after 10 days. The specific gravity of the obtained low-density polyurethane gel is 0.80g / cm 3 , the Shore A hardness is 15, the elongation at break is 100%, and in the range of -40°C to +70°C, tanδ>0.5.

Embodiment 3

[0033] First take 1000 parts of carbodiimide-modified liquefied MDI, 257 parts of polyoxytetramethylene glycol with a molecular weight of 1000, and prepare a semi-prepolymer with an isocyanate content of 25%.

[0034] Get 100 parts of synthetic semi-prepolymers, molecular weight is 496 parts of polyoxybutylene glycols of 2000, 600 parts of 0# aviation kerosene, 295 parts of light wax oil, 5 parts of dibutyltin dilaurate, the above-mentioned components After mixing evenly, pour it into the mold, solidify after 2 days, and reach the best strength after 14 days, and the specific gravity of the obtained low-density polyurethane gel is 0.85g / cm 3 , the Shore A hardness is 10, the elongation at break is 90%, and in the range of -40°C to +60°C, tanδ>0.4.

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Abstract

A low-density polyurethane gel composition used for reducing vibration and noise of underwater acoustic equipment is prepared from the organic chemical containing hydroxy group, the organic compound containing isocyanate group and diluent. Its advantages are high acoustic penetrability, low specific weight, not freezing at low temp and high viscoelasticity.

Description

technical field [0001] The invention relates to a low-density polyurethane gel composition, a preparation method of the gel composition, and an application in underwater acoustic devices. Background technique [0002] Rubber materials, including polyurethane elastomers, have long been used to seal electrical components to protect metal structures from seawater corrosion, while the use of elastomeric materials has no adverse effect on the acoustic performance of electrical components. For example, polyurethane elastomers are usually used to protect the acoustic transducers of underwater devices. The principle is to debubble the polyoxytetramethylene glycol prepolymer containing isocyanate groups at 90-100 ° C, melt the The curing agent MOCA is added and mixed evenly. After removing the air bubbles again, it is quickly poured into the prepared mold and can be used after curing for 1 hour. Commonly used elastomers also include butyl rubber, neoprene and silicone, etc. The abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08L75/04
Inventor 黄微波刘东晖刘培礼王宝柱陈酒姜
Owner MARINE CHEM RES INST CO LTD
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