IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0066163
(2011-04-07)
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| 등록번호 |
US-8333836
(2012-12-18)
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발명자
/ 주소 |
- Luo, Caidian
- Merkley, Donald J.
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| 출원인 / 주소 |
- James Hardie Technology Limited
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
111 |
초록
▼
A fiber cement composite material that incorporates a blend of bleached and unbleached cellulose fibers as a partial or complete substitute for premium grade cellulose pulp is provided. Bleached standard grade cellulose fibers are used in conjunction with unbleached, standard grade cellulose fibers
A fiber cement composite material that incorporates a blend of bleached and unbleached cellulose fibers as a partial or complete substitute for premium grade cellulose pulp is provided. Bleached standard grade cellulose fibers are used in conjunction with unbleached, standard grade cellulose fibers to provide a fiber cement composite product having substantially equal or even superior flexibility and strength as an equivalent fiber cement composite material reinforced by premium grade, unbleached cellulose fibers. A synergistic combination of bleached and unbleached standard grade cellulose fibers to produce a composite material with the desired properties previously achievable only through the use of premium grade cellulose pulp.
대표청구항
▼
1. A method of manufacturing a fiber reinforced cement composite material, comprising: providing cellulose fibers, wherein the cellulose fibers include bleached cellulose fibers having a Kappa number less than about 10, wherein the bleached cellulose fibers comprise less than about 40 wt. % of total
1. A method of manufacturing a fiber reinforced cement composite material, comprising: providing cellulose fibers, wherein the cellulose fibers include bleached cellulose fibers having a Kappa number less than about 10, wherein the bleached cellulose fibers comprise less than about 40 wt. % of total cellulose fibers and are substituted for premium grade cellulose fibers from P. Radiata pine, wherein the bleached cellulose fibers are not from P. Radiata pine having an average tensile strength of more than about 12.5 km by TAPPI method T231;mixing the cellulose fibers with a cementitious component to form a fiber cement mixture;forming the fiber cement mixture into a shaped fiber cement article; andcuring the fiber cement article to form a fiber reinforced cement composite material,wherein, with substitution of the bleached cellulose fibers, modulus of rupture of the fiber reinforced cement composite material when formed is maintained or improved as compared with a fiber reinforced cement composite material manufactured without the substitution for premium grade cellulose fibers. 2. The method of claim 1, wherein providing cellulose fibers includes treating cellulose fibers with a bleaching agent selected from the group consisting of hydrogen peroxide, sodium hypochlorite, and variations thereof. 3. The method of claim 1, wherein the bleached cellulose fibers are from a species selected from the group consisting of Douglas fir, hemlock, spruce, southern yellow pines, kenaf and redwood. 4. The method of claim 2, wherein the cellulose fibers include fibers of P. Radiata pine. 5. The method of claim 1, wherein the cellulose fibers comprises about 0.5 to 20 wt. % of the fiber reinforced cement composite material. 6. The method of claim 1, wherein mixing the cellulose fibers comprises mixing standard grade bleached cellulose fibers to provide the fiber reinforced cement composite material with a comparable or improved toughness as compared with a fiber reinforced cement composite material having only premium grade cellulose fibers. 7. The method of claim 1, wherein the cellulose fibers comprise fibers with An average length between about 1 mm and 3.5 mm. 8. The method of claim 1, wherein the bleached cellulose fibers are initially treated with a bleaching agent to reduce the lignin content of the fibers to a Kappa number of 0 to 1. 9. A formulation for the manufacture of a fiber reinforced cement composite material comprising: a cementitious component; andcellulose fibers that include bleached cellulose fibers having a Kappa number of less than about 10,wherein the bleached cellulose fibers comprise less than about 40 wt.% of total cellulose fibers and are substituted for premium grade cellulose fibers from P. Radiata pine having an average tensile strength of more than about 12.5 km by TAPPI method T231,wherein substitution with bleached cellulose fibers maintains or improves modulus of rupture of the fiber reinforced cement composite material when manufactured with the substitution as compared with a fiber reinforced cement composite material manufactured without the substitution for premium grade cellulose fibers,wherein the bleached cellulose fibers are not from P. Radiata pine. 10. The formulation of claim 9, wherein the bleached cellulose fibers comprise about 0.5 to 20 wt. % of the formulation. 11. The formulation of claim 9, wherein the cellulose fibers do not include premium grade cellulose fibers. 12. The formulation of claim 9, wherein the cellulose fibers have an average length between about 1 mm and 3.5 mm. 13. The formulation of claim 9, wherein none of the cellulose fibers are from P. Radiata pine. 14. The formulation of claim 9, wherein the bleached cellulose fibers are treated with a bleaching agent to reduce the lignin content of the fibers to a Kappa number less than about 10. 15. The formulation of claim 9, wherein the bleached cellulose fibers are from a species selected from the group consisting of Douglas fir, hemlock, spruce, southern yellow pines, kenaf and redwood. 16. A method of manufacturing a fiber reinforced cement composite material, comprising: providing cellulose fibers, wherein the cellulose fibers are refined and comprise a blend of fibers that include bleached fibers having a Kappa number less than about 10, wherein the bleached cellulose fibers comprise less than about 40 wt. % of total cellulose fibers and are substituted for premium grade cellulose fibers from P. Radiata pine having an average tensile strength of more than about 12.5 km by TAPPI method T231, wherein the bleached cellulose fibers are not from P. Radiata pine;mixing the cellulose fibers with a cementitious component to form a fiber cement mixture;forming the fiber cement mixture into a fiber cement article; andcuring the fiber cement article to form a fiber reinforced cement composite material,wherein with substitution of the bleached cellulose fibers modulus of rupture of the fiber reinforced cement composite material when formed is maintained or improved as compared with a fiber reinforced cement composite material manufactured without substitution for premium grade cellulose fibers. 17. The method of claim 16, wherein the bleached cellulose fibers are from a species selected from the group consisting of Douglas fir, hemlock, spruce, southern yellow pines, kenaf and redwood with a Kappa number of 0 to 1. 18. The method of claim 16, wherein the cellulose fibers comprise fibers with an average length between about 1 mm and 3.5 mm. 19. The method of claim 16, wherein mixing the cellulose fibers provides the composite material with improved toughness as compared with a fiber reinforced cement composite material having only premium grade cellulose fibers. 20. The method of claim 16, wherein the cellulose fibers comprise about 0.5 to 20% by weight of the fiber reinforced cement composite material.
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