Foam

Patent metadata

Field	Value
Publication number	US-10947163-B2
Application number	US-201615546983-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Jan 28, 2015
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A foamed body that is a porous foamed body including inorganic fibers other than asbestos, and having a compressive stress when compressed at normal temperature at a compression ratio of 80% of 0.1 MPa or less and a recovery ratio when compressed at normal temperature at a compression ratio of 80% of 50% or more.

First claim

The invention claimed is:

1. A foamed body that is a porous foamed body comprising inorganic fibers other than asbestos and having: (i) a compressive stress of 0.1 MPa or less when the foamed body is compressed at normal temperature at a compression ratio of 80% and (ii) a recovery ratio of 50% or more when the foamed body is compressed at normal temperature at a compression ratio of 80%,
wherein:
the foamed body is an inorganic fibrous foamed body, and
the foamed body is obtained by treating either a dried foamed body or a fired foamed body with a silane coupling agent or a titanium coupling agent.

2. The foamed body according to claim 1 , wherein the foamed body has an apparent Young's modulus of 1 MPa or less when compressed at normal temperature at a compression ratio of 80%.

3. The foamed body according to claim 1 , wherein the foamed body has a bulk density of from 0.005 to 0.1 g/cm 3 at normal temperature.

4. The foamed body according to claim 1 , wherein a product [MPa·g/cm 3 ] of a bulk density and a compressive stress when the foamed body is compressed at normal temperature at a compression ratio of from 40 to 80% is 0.3 or less.

5. The foamed body according to claim 1 , wherein the inorganic fibers are glass fibers.

6. The foamed body according to claim 1 , wherein:
all recovery ratios are 80% or more when the foamed body is compressed at normal temperature at each compression ratio in a range of from 0 to 90%.

7. The foamed body according to claim 1 , wherein the inorganic fibers make up 96 wt % or more of the foamed body.

8. The foamed body according to claim 1 , wherein the inorganic fibers and the silane coupling agent or the titanium coupling agent make up 95 wt % or more of the foamed body.

9. A method for producing the foamed body according to claim 1 , the method comprising:
charging a surface of the inorganic fibers negatively or positively;
stirring a dispersion containing the charged inorganic fibers and a surfactant to allow the dispersion to foam and form a wet foamed body;
drying the wet foamed body; and
treating the dried foamed body with the silane coupling agent or the titanium coupling agent.

10. The foamed body according to claim 5 , wherein the silane coupling agent is used.

11. The foamed body according to claim 10 , wherein the silane coupling agent is methyltriethoxysilane.

12. The foamed body according to claim 11 , wherein the foamed body is obtained by treating a fired foamed body.

13. The foamed body according to claim 12 , wherein the treating the fired foamed body with methyltriethoxysilane includes: (i) contacting the fired foamed body with methyltriethoxysilane, (ii) and then contacting the fired foamed body from (i) with water vapor.

Assignees

• Nichias Corp

Inventors

• Murayama Kazutaka
• Horiuchi Osamu
• Sato Kiyoshi

Classifications

• C03C25/40

  Organo-silicon compounds · CPC title

• C04B20/1051

  Organo-metallic compounds; Organo-silicon compounds, e.g. bentone · CPC title

• C04B2111/52

  Sound-insulating materials · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B38/10 Primary

  by using foaming agents (C04B38/02 takes precedence){or by using mechanical means, e.g. adding preformed foam} · CPC title