Lightweight insulating boards and process for manufacturing same
First Claim
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1. Lightweight insulating board comprising:
- (a) 50-70% by weight of cement,(b) 0-5% by weight of cellulose fibers,(c) 0.5-4% by weight of non-cellulose, alkali-resistant fiber material,(d) 5-20% by weight of mica,(e) 5-20% by weight of light filler and(f) 8-25% by weight of hydrated lime.
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Abstract
Lightweight insulating boards in accordance with the present invention comprise Portland cement, fibers and fillers including:
(a) 50-75% by weight of cement,
(b) 0-5% by weight of cellulose fibers,
(c) 0.5-4% by weight of alkali-resistant fiber material,
(d) 5-20% by weight of mica,
(e) 5-20% by weight of light filler and
(f) 8-25% by weight of hydrated lime.
They are shaped into boards from a suspension and are set at least 15 days, and preferably 28 days. The insulating boards of the present invention meet all of the requirements set for such materials regarding flexural strength, incombustibility, and the like.
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Citations
11 Claims
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1. Lightweight insulating board comprising:
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(a) 50-70% by weight of cement, (b) 0-5% by weight of cellulose fibers, (c) 0.5-4% by weight of non-cellulose, alkali-resistant fiber material, (d) 5-20% by weight of mica, (e) 5-20% by weight of light filler and (f) 8-25% by weight of hydrated lime. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for producing a lightweight insulating board comprising:
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compounding in an excess of water;
50-75% by weight of cement, 0-5% by weight of cellulose fibers, 0.5-4% by weight non-cellulose, alkali-resistant fiber material, 5-20% by weight of mica, 5-20% by weight of light filler and 8-25% by weight of hydrated lime to produce a suspension;separating superfluous water from the suspension while shaping into a board; and setting the board in a humid atmosphere for at least 15 days. - View Dependent Claims (9, 10, 11)
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Specification