Claims
- 1. A hydrous calcium silicate material having thermal and electrical insulating properties, sound and vibration damping properties, mechanical strength, electromagnetic radiation absorbing properties, water resistance and resistance to acids, which comprises at least 90% by weight of 11.3 .ANG. tobermorite, about 3.5-5.5% by weight of an organic or inorganic fiber, about 0.3-0.45% by weight of sodium carboxymethylcellulose, the calcium hydrosilicate material comprising a crystalline structure, wherein the material is thermally stable at temperatures as high as about 1100.degree. C., cryogenically stable at temperatures as low as about -180.degree. C. and has a micropore area of at least 60 m.sup.2 /particle.
- 2. The hydrous calcium silicate material of claim 1, wherein the material has a bulk density of about 400 kg/m.sup.3, a thermal conductivity of about 0.11-0.16 W/mK, a compressive resistance of about 3.2 MPa, a maximum linear shrinkage of about 3.5% after 24 hours of heating at 1,273.15.degree. K., a thermal shock resistance of about 26, a mechanical strength of about 32 kg/cm.sup.2, an electrical resistance of sample plates, 10 mm thick, of about 200,000 M.OMEGA. and an ability to absorb electromagnetic radiation with a spectrum of about 0.8-3.0 .mu.m.
- 3. The hydrous calcium silicate material of claim 1, including organic fibers comprising cellulose based material.
- 4. The hydrous calcium silicate material of claim 3, wherein the cellulose based material comprises paper, flax or hemp fibers about 5 mm in length.
- 5. The hydrous calcium silicate material of claim 1, including inorganic fibers comprising chrysotile asbestos fibers about 6 mm long or vermiculite fibers about 5 mm long.
- 6. A material according to claim 1 comprising about 4.7% by weight of an organic or inorganic fiber.
- 7. A material according to claim 3 comprising about 4.7% by weight of said organic fiber.
- 8. A material according to claim 4 comprising about 4.7% by weight of said organic fiber.
- 9. A process for preparing a hydrous calcium silicate material comprising:
- (a) successively adding hydrated lime, comprising at least 72% by weight calcium oxide, and pulverized quartz, comprising at least 97% silicon dioxide, to a solution containing about 0.3-0.45% by weight of sodium carboxymethylcellulose to form a suspension, such that the amount of calcium oxide to silicon dioxide is in a ratio of about 0.60:1 to about 0.73:1 by weight;
- (b) mixing with the suspension an aqueous mixture of organic or inorganic fibers to form a pulp such that a ratio of liquid phase to solid phase of about 2.9 to 4.0 by weight is formed in the pulp wherein the fibers comprise about 3.5-5.5% by weight of the pulp;
- (c) adding sodium hydroxide in an amount of about 0.02% by weight of silicon dioxide in the pulp;
- (d) pouring the pulp into a die;
- (a) autoclaving the die containing the pulp at a pressure ranging from about 11.0-12.5 bar for about 16-28 hours to form a hard molded calcium hydrosilicate material; and
- (f) drying the calcium hydrosilicate material.
- 10. The process of claim 9, including organic fiber comprising a cellulose based material.
- 11. The process of claim 10, wherein the cellulose based material comprises fibers of paper, hemp or flax about 5 mm in length.
- 12. The process of claim 9, including inorganic fiber comprising chrysotile asbestos fibers about 5 mm long or vermiculite fibers about 6 mm long.
- 13. The process of claim 9, wherein the hydrous calcium silicate material is dried at a temperature of about 250.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
P-1290/89 |
Jun 1989 |
YUX |
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Parent Case Info
This is a continuation of application Ser. No. 07/541,999, filed Jun. 22, 1990, now abandoned.
US Referenced Citations (9)
Non-Patent Literature Citations (1)
Entry |
The Merk Index, 10th Ed., Merck & Co., Inc., 1983, p. 234. |
Continuations (1)
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Number |
Date |
Country |
Parent |
541999 |
Jun 1990 |
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