Soft polyurethane foam damping material
A soft polyurethane and damping material technology, applied in the field of foam damping materials, can solve the problems of cumbersome preparation process of whiskers, increase storage modulus and other problems, and achieve the effects of good hand feeling, short time consumption and high loss factor.
Active Publication Date: 2020-07-03
SHANGHAI HUATE AUTOMOTIVE PARTS
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Problems solved by technology
[0004] Polyurethane damping materials are used in various forms, such as castable damping elastomers, microporous damping elastomers, foam damping materials, and liquid damping coatings, among which castable damping elastomers are the most extensively studied, and related research reports on polyurethane foam damping materials Less, known, such as patent CN201210573838.0, by adding glass beads, using physical blending to increase the damping performance of polyurethane foam materials, patent CN201810934725.6, by mixing pre-prepared boron-titanium-magnesium crystals Whiskers are used to improve the damping effect of the overall foam, and the whisker preparation process is relatively cumbersome
Polyurethane foam is prepared by adding fillers. Although ideal damping performance can be obtained, the storage modulus of the material will be significantly improved, making the product in some fields, such as the requirements for hand feel and softness, will be different. lacking
Method used
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Effect test
Embodiment 1-4
[0041] The components of the polyol mixture and the isocyanate in Examples 1-4 and Comparative Examples 1-2 are specifically shown in Table 1 in parts by weight.
[0042] Table 1 embodiment 1-4 and comparative example 1-2 product formula
[0043]
[0044] The preparation steps and process are as follows:
[0045] Stir the components in the polyol mixture evenly according to the proportions in Table 1, control the temperature of the polyol mixture and isocyanate at about 25°C, mix the two components according to the isocyanate index in Table 1 and stir rapidly for 6-8 seconds, then pour into the temperature In an aluminum mold (200mm×200mm×60mm) at 65°C, the mold is closed and matured for 5 minutes. After the mold is opened, the foam product is taken out and placed at room temperature for 72 hours to test its performance.
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Abstract
The invention relates to a soft polyurethane foam damping material. The soft polyurethane foam damping material is prepared by mixing and reacting a polyol mixture and isocyanate according to an isocyanate index of 0.5-0.9. Compared with the prior art, by adjusting the molecular structure of soft and hard segments, the high loss factor and the low storage modulus of the material are achieved. Thedensity of the damping material is 50-120kg / m<3>; the loss factor is greater than or equal to 0.3, and the energy storage modulus is 30-200KN / m<2>. The material has low VOCs and low odor, can be widely applied to automobile interior sound absorption, sound insulation and vibration reduction materials such as carpets and front walls, and can also be applied to occasions with high sound absorption and sound insulation requirements, such as home decoration, studios, and the like.
Description
technical field [0001] The invention belongs to the technical field of foam damping materials and relates to a soft polyurethane foam damping material. Background technique [0002] Damping material is also called vibration attenuation material or damping material, which can convert mechanical vibration energy or sound energy into heat energy to attenuate vibration, and is mainly used for vibration and noise control. Viscoelastic materials are very good damping materials. Usually viscoelastic materials have a high loss factor and a low storage modulus. The loss factor (also known as damping factor, represented by tanδ) determines the ability of the material to dissipate energy, which is the main index to characterize the damping performance of the material; the storage modulus Quantity (also known as Young's modulus) determines the stiffness of the material. [0003] Among them, polyurethane (PU) is a very important viscoelastic material, which has been widely used in spec...
Claims
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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/63C08G18/32C08G101/00
CPCC08G18/7664C08G18/6688C08G18/3275C08G18/4837C08G18/4829C08G18/632C08G18/4072C08G18/4816C08G2110/0058C08G2110/0083
Inventor 李小斌颜海华
Owner SHANGHAI HUATE AUTOMOTIVE PARTS