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CN-122010443-A - Dispersing method and application of basalt chopped fiber for calcium silicate board reinforcement

CN122010443ACN 122010443 ACN122010443 ACN 122010443ACN-122010443-A

Abstract

The invention belongs to the technical field of calcium silicate boards, and discloses a dispersion method and application of basalt chopped fibers for reinforcing a calcium silicate board. The dispersion method comprises the following steps of mixing basalt chopped fibers with an aqueous solution of hypohalite, stirring and dispersing, and then washing with water to obtain unbranded basalt fibers, dissolving phosphate in water, adding microcrystalline cellulose and dispersing uniformly, finally adding unbranded basalt fibers, and dispersing by a high-speed dispersing machine to obtain basalt fiber dispersion liquid. The invention adopts the synergistic action mechanism of electrostatic repulsion, steric hindrance and network isolation, can remarkably improve the dispersion stability of basalt fibers in smaller single strand and monofilament states, and can remarkably improve the reinforcing effect of the basalt fibers on the calcium silicate board.

Inventors

  • MIAO FEI
  • CHEN JINGFU
  • WANG YANG
  • Chu Shouxing

Assignees

  • 佛山市三乐建材实业有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. A dispersion method of basalt chopped fiber for reinforcing a calcium silicate board is characterized by comprising the following steps: (1) Splitting, namely mixing the basalt chopped fiber with an aqueous solution of hypohalite, stirring and dispersing, and washing to obtain the split basalt fiber; (2) And (3) dispersing, namely firstly dissolving phosphate in water, then adding microcrystalline cellulose, dispersing uniformly, finally adding the unbeamed basalt fiber obtained in the step (1), and dispersing by a high-speed dispersing machine to obtain basalt fiber dispersion liquid.
  2. 2. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 1, wherein: The length of the basalt chopped fiber in the step (1) is 6-12 mm; The hypohalite in step (1) comprises at least one of hypochlorite, hypobromite and hypoiodite, preferably hypochlorite, including but not limited to at least one of calcium hypochlorite, lithium hypochlorite, sodium hypochlorite and potassium hypochlorite; the phosphate in the step (2) comprises at least one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate and sodium polyphosphate, preferably sodium hexametaphosphate.
  3. 3. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 1, wherein: The effective halogen content of the hypohalite aqueous solution in the step (1) is 1% -15%, preferably 5% -10%; and (2) mixing the basalt chopped fiber in the step (1) with an aqueous solution of hypohalite according to the mass ratio of 1 (4-8).
  4. 4. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 1, wherein: the stirring and dispersing in the step (1) means stirring and dispersing for 30-60min at 50-200 rpm; the step (1) of washing with water means washing with water until the washing liquid is neutral.
  5. 5. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 1, wherein: The dosages of the phosphate, the water, the microcrystalline cellulose and the unbranded basalt fiber in the step (2) are as follows, wherein the concentration of the phosphate in the obtained basalt fiber dispersion liquid is 0.01 to 0.05 wt percent, the concentration of the microcrystalline cellulose is 0.5 to wt to 1.5 to wt percent, the concentration of the basalt fiber is 2 to wt to 4 to wt percent, and the balance is water.
  6. 6. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 5, wherein: In the basalt fiber dispersion liquid obtained in the step (2), the mass ratio of phosphate to microcrystalline cellulose is 0.02:1.
  7. 7. The method for dispersing basalt chopped fiber for reinforcing a calcium silicate board according to claim 1, wherein: The dispersion in the step (2) by a high-speed dispersing machine means that the dispersion is carried out at a high speed of 20-60 min under the conditions of 1000 rpm-2000 rpm.
  8. 8. A basalt fiber-reinforced calcium silicate board dispersion liquid produced by the method of any one of claims 1 to 7.
  9. 9. Use of the basalt fiber-dispersed liquid for reinforcing a calcium silicate board according to claim 8 for preparing a calcium silicate board.
  10. 10. The calcium silicate board is characterized in that calcium powder and siliceous powder are added into basalt fiber dispersion liquid for reinforcing the calcium silicate board according to claim 8, water is added for dilution until the solid content is 9 wt-20 wt%, and board making is carried out after stirring and mixing, thus obtaining the calcium silicate board.

Description

Dispersing method and application of basalt chopped fiber for calcium silicate board reinforcement Technical Field The invention belongs to the technical field of calcium silicate boards, and particularly relates to a dispersion method and application of basalt chopped fibers for reinforcing a calcium silicate board. Background The calcium silicate board widely applied in the market at present is prepared by taking siliceous and calcareous materials as cementing materials and plant fibers as reinforcing materials according to a plurality of procedures, and is a new generation of green environment-friendly building materials. The strength properties depend, in addition to the properties of the cement, on the fibrous material used as reinforcing material. However, because the calcium silicate board needs to be steamed and cured for a long time in a high-temperature and high-alkalinity environment, the plant fiber is inevitably subjected to peeling reaction or intermolecular fracture, so that the polymerization degree of the plant fiber is reduced, and the plant fiber is macroscopically reflected to be irreversibly damaged in strength and toughness of the board. Based on the current situation, there is an urgent need to develop a high strength reinforcing fiber that does not degrade, break in high temperature, high alkaline steam curing environments to replace or partially replace plant fibers. The basalt fiber is continuous fiber formed by high-speed drawing of basalt stone at 1450-1500 ℃ after melting, and has excellent mechanical property, tensile strength reaching 3000-4800 Mpa, good temperature resistance, use temperature ranging from-260 ℃ to 700 ℃ (softening point of 960 ℃), outstanding chemical stability, good durability in saturated Ca (OH) 2 solution and in alkaline media such as cement, and high stability. Therefore, basalt fiber is an ideal and superior reinforcing material for calcium silicate boards in technical characteristics, and is one of important options for promoting the industry of calcium silicate boards to upgrade to higher performance and more environment-friendly directions. In the production process of the calcium silicate board, no matter the pulp flowing method or the shoveling method is used for forming, the high requirement on the dispersibility of the fibers is met, however, basalt fibers usually appear in a short cutting form and a bundling state in practical application, and if the basalt fibers are directly added into the slurry of the calcium silicate board, cotton flocculent aggregates are formed in the slurry, so that a series of problems such as blocking of a net part, uneven mechanical strength of the board and the like are caused. Meanwhile, the bundling effect enables a large number of fiber monofilaments to be embedded, so that the number of fibers which can be in contact with a reinforcing base material is greatly reduced, and the high specific strength characteristic of the large number of fiber monofilaments cannot be reflected. Therefore, the basalt chopped fibers should be unbundled and dispersed before being added to the calcium silicate board slurry. The dispersion method of basalt chopped fibers has been specially developed by students according to their application in a specific field. For example, chinese patent application publication CN 109486120A adopts a series of physical means to uniformly disperse basalt chopped fibers in a vinyl resin in a spatial three-dimensional form, and prepares a basalt chopped fiber reinforced vinyl resin composite material. However, this method does not involve a process of dispersing basalt fibers in an aqueous system. Chinese patent application publication CN 106673474A preliminarily disperses basalt chopped fiber through the synergistic effect of mechanical stirring and ultrasonic waves, then adds anionic surfactant and composite foaming agent for treatment, and is applied to foamed concrete materials. However, this method generates a large amount of foam, and if it is applied to a calcium silicate board production process, it causes difficulty in the calcium silicate board molding process, increases energy consumption, and even reduces product quality. Disclosure of Invention In order to solve the problems of insufficient beam splitting, agglomeration and uneven dispersion of basalt chopped fibers in calcium silicate board slurry, the primary aim of the invention is to provide a dispersion method of basalt chopped fibers for reinforcing a calcium silicate board. The invention also aims to provide basalt fiber dispersion liquid for reinforcing the calcium silicate board, which is prepared by the method. It is still another object of the present invention to provide the use of the basalt fiber dispersion liquid for reinforcing a calcium silicate board as described above for producing a calcium silicate board. The calcium powder and the siliceous powder are added into the basalt fiber dispersion liquid of the invention to b