Preparation methods for non-macroscopic-interface density gradually-changed type composite foam

A composite foam, gradient technology, which is applied in the field of preparation of composite foam without macro-interface density gradient, can solve the problems of lack of patents and reports, affecting the acoustic performance of composite foams such as sound transmission or sound absorption, and the method is simple and feasible. Strong design, the effect of solving poor bonding

Inactive Publication Date: 2017-10-17
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the density of the adhesive used for bonding is much higher than that of the composite foam, which will form a layer of isolation layer on the bonding surface, thus affecting the acoustic performance of the composite foam such as sound transmission or sound absorption.
[0005] How to prepare interfaceless density gradient composite foam to meet the acoustic performance requirements of the underwater environment, there are no patents or reports on this aspect in China at present

Method used

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  • Preparation methods for non-macroscopic-interface density gradually-changed type composite foam
  • Preparation methods for non-macroscopic-interface density gradually-changed type composite foam
  • Preparation methods for non-macroscopic-interface density gradually-changed type composite foam

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Embodiment 1

[0032] Taking the preparation of a four-layer density structure composite foam with no macro interface density gradient as an example, the density is designed to be 0.570 g / cm from low to high 3 , 0.600 g / cm 3 , 0.630 g / cm 3 , 0.702 g / cm 3 , each layer of syntactic foam occupies 1000 cm 3 .

[0033] The preparation steps are as follows:

[0034] S1. Preparation of resin matrix: Stir and mix epoxy resin E51, curing agent methyltetrahydrophthalic anhydride, and accelerator DMP-30, wherein the weight ratio of E51: methyltetrahydrophthalic anhydride is 100:80, and the weight ratio of DMP-30 It is 0.5% of the weight of the matrix resin. Vacuumize to remove air bubbles to obtain a resin matrix with a density of 1.2g / cm 3 ;

[0035] S2. Calculate the amount of raw materials corresponding to each layer of composite foam according to the designed density and volume:

[0036] Each layer of composite foam is composed of the resin matrix obtained in step S1 and hollow glass microsp...

Embodiment 2

[0045] Taking the preparation of a three-layer density structure composite foam with no macro interface density gradient as an example, the density is designed to be 0.3 g / cm from low to high. 3 , 0.4 g / cm 3 , 0.5 g / cm 3 , each layer of syntactic foam occupies 1000 cm 3 .

[0046] The preparation steps are as follows:

[0047] S1. Preparation of resin matrix: Stir and mix epoxy resin E51, curing agent methyltetrahydrophthalic anhydride, and accelerator DMP-30, wherein the weight ratio of E51: methyltetrahydrophthalic anhydride is 100:80, and the weight ratio of DMP-30 It is 0.5% of the weight of the matrix resin. Vacuumize to remove air bubbles to obtain a resin matrix with a density of 1.2g / cm 3 ;

[0048] S2. Calculate the amount of raw materials corresponding to each layer of composite foam according to the designed density and volume:

[0049] Each layer of composite foam is composed of the resin matrix obtained in step S1, hollow glass microspheres and expandable mi...

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Abstract

The invention belongs to the field of preparation of composite foam and particularly discloses preparation methods for non-macroscopic-interface density gradually-changed type composite foam. Actually, the two preparation methods are provided, specifically, the first method is used for preparing the density gradually-changed type composite foam by changing the wall thicknesses of hollow microspheres, and the other method is used for preparing the density gradually-changed type composite foam by adopting expandable microspheres. The methods are simple and high in designability, the porosity in the composite foam can be accurately controlled, and the density of the composite foam in different parts is controlled according to the design requirements. Due to the fact that all layers of the composite foam are co-cured to be formed by adopting resin matrixes of the same system, the interface of the composite foam of different densities is eliminated, the problems that due to the interface problem, composite foam structures of different densities are poor in adhesion, and sound absorption or sound transmission performance does not meet the requirement are solved, and the foam is mainly used as an energy absorbing material and a sound transmission material.

Description

technical field [0001] The invention belongs to the field of composite foam preparation, and in particular relates to a preparation method of composite foam without macro interface density gradient. Background technique [0002] Syntactic foam is also called polymer syntactic foam, syntactic foam or solid buoyancy material. Synthetic foam material is a new type of high-strength, low-density solid buoyancy material, which is mainly composed of polymer materials (such as epoxy resin) and porous lightweight materials. The material has an adjustable density (0.20 ~ 0.7g / cm 3 ), low water absorption (not more than 3%), high mechanical strength (compressive strength 1-100MPa), corrosion resistance and so on. The material is able to maintain adequate strength at lower densities, and is characterized by a high compressive strength-to-weight ratio, low creep and low water absorption. Syntactic foam can provide buoyancy for marine development equipment (such as oil and gas extractio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/20C08K7/28C08L63/00
CPCB29C67/20C08K7/28C08L2203/14C08L63/00
Inventor 刘喜宗吴恒姚栋嘉张东生牛利伟
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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