Gradient damping composite material based on mass spring model and preparing method of gradient damping composite material
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A damping composite material and spring model technology, applied in the field of damping composite materials, can solve the problems of low damping loss factor and narrow damping temperature range, and achieve the effect of simple method and high damping loss
Active Publication Date: 2017-04-26
HEILONGJIANG HEIKE TECH CO LTD
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[0003] The present invention aims to solve the technical problems of the existing single-layer damping composite material with too narrow damping temperature range and low damping loss factor, and provides a gradient damping composite material based on mass spring model and its preparation method
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specific Embodiment approach 1
[0020] Specific embodiment 1: The gradient damping composite material based on the mass spring model of this embodiment is composed of multiple damping layers. The damping layer is composed of polyurethane elastomer-coated mass particles and basalt flake fibers; from bottom to top, the upper damping layer The degree of crosslinking of the polyurethane elastomer is greater than that of the polyurethane elastomer of the lower damping layer.
specific Embodiment approach 2
[0021] Embodiment 2: The method for preparing a gradient damping composite material based on a mass spring model described in Embodiment 1 is carried out in the following steps:
[0022] 1. Weigh the mass particles, polyurethane prepolymer, basalt flake fiber, chain extender and / or curing agent; wherein the mass ratio of the mass particles to the polyurethane prepolymer is (20-30): 100, the mass particles The mass ratio to basalt flake fiber is 1:(1~1.5), the mass of chain extender is M 1 22%-24% of the mass of the polyurethane prepolymer, the mass of the curing agent N 1 1% to 4% of the mass of the polyurethane prepolymer;
[0023] 2. Add the mass particles to the surface modifier, let it stand, filter out the settled mass particles, and take the upper liquid to obtain a dispersion of surface modified mass particles;
[0024] 3. Put the polyurethane prepolymer into a three-necked bottle, after vacuum degassing, add the surface-modified mass particle dispersion prepared in step two, ...
specific Embodiment approach 3
[0030] Specific embodiment three: This embodiment is different from specific embodiment two in that the polyurethane prepolymer described in step one is a reactive semi-finished product prepared from polyol and diisocyanate; wherein the total amount of -OH in the polyol is the same as that in the diisocyanate. -The molar ratio of the total amount of NCO is 1:2; the polyols are polyethylene adipate diol, polyethylene adipate, polycaprolactone polyol, and polycarbonate diol , Polybutylene adipate diol, polymethyl methacrylate, polyethyl methacrylate; the diisocyanate is 2,4-toluene diisocyanate, 2,4-toluene diisocyanate and A mixture of 2,6-toluene diisocyanate with a mass ratio of 80:20, 4,4-diphenylmethane diisocyanate, isophorone diisocyanate, or a mixture of two of them; the other and specific embodiment two the same.
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Abstract
The invention discloses a gradient damping composite material based on a mass spring model and a preparing method of the gradient damping composite material, relates to damping composite materials and aims at solving the problems that an existing single-layer damping material is narrow in damping temperature range, and damping loss factors are low. The gradient damping composite material is composed of multiple damping layers, and each damping layer is composed of mass block particles wrapped by polyurethane elastomer and basalt flake fibers. The crosslinking degree of the polyurethane elastomer on the upper damping layer is larger than the crosslinking degree of the polyurethane elastomer on the lower damping layer. The preparing method comprises the steps that the mass block particles are added into polyurethane prepolymer to be subjected to the reaction, then, the polyurethane-wrapped elastomer is formed, the basalt flake fibers are then added, shearing and grinding are uniform, a chain extender and/or a curing agent are/is added according to the amount of the chain extender and/or the curing agent from low to high, and pouring liquid of all layers is obtained; layer-by-layer pouring is conducted according to the crosslinking degree from low to high, the composite material is obtained through curing, and the loss factor of the composite material at the temperature ranging from -40 DEG C to 1 DEG C ranges from 0.7 to 1.17. The gradient damping composite material can be used in the damping field.
Description
Technical field [0001] The invention relates to a damping composite material and belongs to the field of material physics science. Background technique [0002] With the development of damping and vibration reduction technology, viscoelastic resin-based composite materials are constantly enriched, from free damping layer to constrained damping structure, and the form of damping paving has also developed from single layer to multi-layer structure. Free damping is to directly paste the damping material on the surface of the structural part that needs to be damped. When the structural part is subjected to vibration, the damping layer undergoes tensile deformation and consumes energy; the constrained damping structure is a constrained layer with high modulus adhered to the damping layer Material, when the structural part undergoes shear deformation, more energy is lost in shear. The single-layer constrained damping material currently studied and applied has a low damping loss factor...
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