Cementitious material reinforced with chemically treated cellulose fiber
A cellulose fiber and chemical treatment technology, applied in the field of cementitious materials, can solve the problems of limited value of cellulose materials
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Embodiment 1
[0150] Example 1: Southern softwood kraft fiber (SSK)
[0151] In this example, wood chips, predominantly of the Slash pine species, were kraft pulped to a permanganate value (K value) of about 17 ml (determined by the procedure described in TAPPI method T214). The fibers were washed and quality screened and then bleached to an ISO brightness of about 86% in the D-Eop-D-Ep-D sequence. Viscosity, as determined according to T230om-94, was about 16 cP.
[0152] The bleached cellulose fibers were diluted with water to a pH 6.5 stock containing 0.9 parts fiber per 100 parts stock. The resulting slurry was continuously dewatered on a tablet press where the board was formed at a rush / drag ratio of 1.0, couch-rolled, then extruded and densified to 48 parts fiber per 100 using a three-stage wet press. total servings. The board was dried to 94% solids using a conventional drum dryer. The pulp from the reels is then processed into individual rolls. The board was then defibrillated i...
Embodiment 2
[0153] Example 2: Treated fiber (TF1): treatment with polyvalent metal and weak acid
[0154] Chips, mainly of the slash pine species, were kraft pulped to a permanganate value (K value) of about 17 ml (determined by the procedure described in TAPPI method T214). The fibers were washed and quality screened and then bleached to an ISO brightness of about 86% in the D-Eop-D-Ep-D sequence. Viscosity, as determined according to T230om-94, was about 16 cP.
[0155] These bleached cellulose fibers were diluted with water to a stock containing 4.5 parts fiber per 100 parts stock. Add 9.36 parts of aluminum sulfate hydrate (Al 2 (SO 4 ) 3 *14H 2 O). The aluminum sulfate hydrate was obtained from General Chemical Corporation. The resulting slurry had a pH of 3.2. After mixing for 25 minutes, 3.0 parts of sodium hydroxide per 100 parts of fiber was added along with sufficient water to provide a pH of 5.7 with 0.9 parts of fiber per 100 parts of slurry. The temperature was adjus...
Embodiment 3
[0156] Example 3: Treated fibers (TF2): Treatment with polyvalent metals
[0157] Chips, mainly of the slash pine species, were kraft pulped to a permanganate value (K value) of about 17 ml (determined by the procedure described in TAPPI method T214). The fibers were washed and quality screened and then bleached to an ISO brightness of about 86% in the D-Eop-D-Ep-D sequence. Viscosity, as measured by T230om-94, was about 16 cP.
[0158] These bleached cellulose fibers were diluted with water to a stock containing 4.5 parts fiber per 100 parts stock. Add 9.36 parts of aluminum sulfate hydrate (Al 2 (SO 4 ) 3 *14H 2 O). The aluminum sulfate hydrate was obtained from General Chemical Corporation. The resulting slurry had a pH of 3.2. After mixing for 25 minutes, 3.0 parts of sodium hydroxide per 100 parts of fiber was added along with sufficient water to provide a pH of 5.7 with 0.9 parts of fiber per 100 parts of slurry. The temperature was adjusted to 60°C. The result...
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