Method of making a fiber cement board with improved properties and the product
View Patent ↗A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.
1. A fiber cement board, comprising:
a cementitious matrix;
kraft cellulose pulp fibers dispersed throughout the cementitious matrix, and
nanocrystalline cellulose dispersed throughout the cementitious matrix.
2. The fiber cement board of claim 1 wherein the nanocrystalline cellulose is present in an amount of 0.05% to 3% by weight based on the weight of the total dry solids in the cementitious matrix.
3. The fiber cement board of claim 1 wherein the cellulose pulp fibers are present in the amount of 5 to 10 percent of the total dry solids in the cementitious matrix.
4. The fiber cement board of claim 1 wherein the cementitious material comprises 30 to 40 percent of the total dry solids in the cementitious matrix.
5. The fiber cement board of claim 1 wherein the nanocrystalline cellulose particles have a width in the range of 0.05 to 5 μm.
6. The fiber cement board of claim 1 wherein the nanocrystalline cellulose particles have a length in the range of 2.5 to 60 μm.
7. The fiber cement board of claim 1 wherein the MOE of the composite building material is 10% greater than a composite building material that does not have nanocrystalline cellulose.
8. The fiber cement board of claim 7 wherein the MOR of the composite building material remains substantially the same as a composite building material that does not contain nanocrystalline cellulose.
9. The fiber cement board of claim 7 wherein the ETB of the composite building material remains substantially the same as a composite building material that does not contain nanocrystalline cellulose.
10. The fiber cement board of claim 1 wherein the saturated moisture absorption is reduced 1% as compared to a composite building material that does not contain nanocrystalline cellulose.
11. The fiber cement board of claim 1 wherein the saturated moisture absorption is reduced 2% as compared to a composite building material that does not contain nanocrystalline cellulose.
12. The fiber cement board of claim 1 wherein the time it takes to reach 1 mm of vertical wicking is five times as long as in a composite building material that does not contain nanocrystalline cellulose.
13. The fiber cement board of claim 1 wherein the time it takes to reach 1 mm of vertical wicking is fifteen times as long as in a composite building material that does not contain nanocrystalline cellulose.