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Composition containing branched polymer for vibration-damping material

A damping material and polymer technology, which is used in springs made of plastic materials, other chemical processes, mechanical equipment, etc., can solve the problems of low elastic modulus, limited polymer filler content, and poor viscosity, and achieve high damping. (Energy attenuation), high degree of freedom in material design, and improved physical properties

Inactive Publication Date: 2013-06-05
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, unless the filler amount of the polymer having one crosslinkable functional group is increased, the energy dissipation tends not to increase, but there is a limit to the filler amount of the polymer
It is clear that if the content becomes high, the elastic modulus will be extremely low, and the viscosity will also deteriorate, making it difficult to handle.
Therefore, for the above-mentioned materials, the actual situation is that satisfactory materials have not yet been obtained in terms of characteristics, workability, and cost.

Method used

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  • Composition containing branched polymer for vibration-damping material

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0327] The method for preparing the damping material of the present invention is not particularly limited, and may be prepared in the form of a one-component type that cures with moisture in the air after all the compounding components are mixed in advance, sealed and stored, or It is prepared as a 2-component type in which components such as a curing catalyst, filler, plasticizer, and water are previously blended as a curing agent, and the blended materials and polymer composition are mixed before use. If it is a 2-component type, a colorant can be added when mixing the 2 components. If the colorant is a material obtained by mixing and slurrying a filler such as a pigment, a plasticizer, and depending on the case, handling is easy. In addition, by adding a retarder when mixing the two components, the curing speed can be fine-tuned at the job site.

[0328] "Damping Material"

[0329] A damping material obtained by curing the composition for a damping material containing the ...

Embodiment

[0335] Hereinafter, specific examples and comparative examples of the present invention will be described together, but the present invention is not limited to the following examples.

[0336] "Parts" and "%" in the following Examples and Comparative Examples represent "parts by weight" and "% by weight", respectively. In addition, the term "triamine" in this example refers to pentamethyldiethylenetriamine.

[0337] In the following examples, "weight average molecular weight" and "molecular weight distribution (ratio of weight average molecular weight to number average molecular weight)" were calculated by the standard polystyrene conversion method using gel permeation chromatography (GPC). Among them, products filled with polystyrene cross-linked gel (shodex GPCK-804, K-802.5; manufactured by Showa Denko) were used as the GPC column, and chloroform was used as the GPC solvent. In addition, the number of functional groups introduced per 1 molecule of polymer can be used 1 Th...

manufacture example 1

[0339] (Synthesis of poly(n-butyl acrylate) having an acryloyl group at one end)

[0340] (1) Polymerization process

[0341] 100 parts of n-butyl acrylate are deoxygenated. The interior of a stainless steel reaction vessel with a stirrer was deoxidized, 0.42 parts of cuprous bromide and 20 parts of deoxidized n-butyl acrylate were charged, and heated and stirred. Add 4.4 parts of acetonitrile and 1.9 parts of ethyl α-bromobutyrate as an initiator, mix them, and add 0.018 parts of pentamethyldiethylenetriamine (hereinafter referred to as triamine) to initiate polymerization. Add the remaining 80 parts of n-butyl acrylate sequentially to promote the polymerization reaction. During the polymerization, it is appropriate to add triamine to adjust the polymerization speed. The total amount of triamines used in the polymerization was 0.06 parts. When the polymerization progresses, the internal temperature rises due to the heat of polymerization, so the polymerization is carried...

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Abstract

A purpose of the present invention is to provide a vibration damper which, in a specific temperature range around room temperature (-20 C to 20 C), shows extremely high vibration-damping (energy-attenuating) properties with respect to vibrations having a frequency not lower than low frequencies (several hertz), which can have vibration-damping performance that has been controlled at will so that the damper effectively functions not only in a low-temperature high-frequency range but also in an extremely-low-frequency specific range and in a specific temperature range, and which has a high degree of freedom of material design. The vibration damper is accomplished with a composition for vibration-damping materials which comprises a branched polymer (A) and a resin (B), the amount of the branched polymer (A) being 15-85 wt.% with respect to the total amount of the branched polymer (A) and the resin (B).

Description

technical field [0001] The present invention relates to a composition for damping materials containing branched polymers. Background technique [0002] Damping materials are used in a wide range of fields such as audio equipment, electrical and electronic equipment, semiconductors, ship detectors, automobiles, cameras and office equipment, industrial equipment, and railways for the purpose of reducing noise and vibration. Damping materials are designed centered on polymer materials. As matrix polymers, there are butyl rubber, EVA, polynorbornene, silicone gel, polyurethane, epoxy resin, various liquid materials, and thermoplastic elastomers. Design, design and development have excellent damping characteristics (Non-Patent Document 1). These damping materials are polymer materials, and a simple index of their damping performance (damping performance) uses loss tangent tan δ obtained by dynamic viscoelasticity measurement. If the loss tangent tanδ is high, the dynamic viscoe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/00C09K3/00F16F1/36F16F15/02
CPCC08L33/10C08F299/00C08L51/003C08L55/005
Inventor 竹田正直吉桥健一
Owner KANEKA CORP
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