Colloidal silicate dispersion, method for its preparation and its use

A dispersion, silicate technology, used in sol preparation, gel preparation, colloid chemistry, etc., can solve problems such as poor compression resistance, brittleness, and easy dusting

Inactive Publication Date: 2003-08-20
PAROC GRP OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a product, although it has good water and heat resistance, has poor compression resistance and is therefore brittle and dusty

Method used

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  • Colloidal silicate dispersion, method for its preparation and its use
  • Colloidal silicate dispersion, method for its preparation and its use
  • Colloidal silicate dispersion, method for its preparation and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The adhesive of the present invention can be prepared by the following method.

[0056] 7.5g of mineral fibers containing 42.1% SiO 2 , 17.4% Al 2 o 3 , 17.3% CaO, 13.7% MgO, 5.8% FeO, 1.6% Na 2 O, 0.6% K 2 O, the rest are impurities, the fiber diameter is 3-4μm, and the length is 3-10mm. The mineral fiber is mixed with 100ml of 5M formic acid solution. For mixing, a high shear mixing agitator is used to ensure efficient mixing and speed up the dissolution process. The dissolution process takes 1-2hr to complete. When the fibers are completely dissolved, a small amount of polymer, eg, polyethylene glycol with a molar mass of 1000 to 10000, is added, about 1% by weight based on the total solids content of the solution. As the polymer is added, the solution is mixed continuously to stabilize the particles that have formed. By varying the amount of polymer and the time of addition, the point at which all fibers dissolve, the size of the solution particles is also va...

Embodiment 2

[0060] 2.1 g of fibers having a composition corresponding to Example 1 were dissolved in 100 ml of 1M formic acid solution. After the fibers were dissolved, impurities in the solution were removed by centrifugation. The samples were analyzed by light scattering metrology. Nucleation of primary particles occurs in solution, and the particles exhibit steady growth with increasing particle size over time, as shown in figure 1 middle.

[0061] If the dispersion is not stabilized, it will gel over time, see results in figure 2 ,exist figure 2 A test performed by dissolving 1.15 g of fiber with the above composition in 100 ml of formic acid of various concentrations is demonstrated in . from figure 2 It can be seen that the range of gelation time is 5-12 days.

[0062] In order to study the change of pH as a function of time, 1.15g of fiber containing the above composition was dissolved in 100ml of variable concentration acetic acid solution, the results are shown in image...

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Abstract

The present invention is directed to a colloidal aqueous silicate dispersion containing silica and alumina, the molar ratio between silica and alumina being 2 - 12, as well as to a method for its preparation. Said method is characterized by dissolving a particulate mineral material, such as a mineral wool or fibre product containing silica and alumina in a molar ratio of 2 - 12 in an aqueous solution, nucleating and stabilizing the so obtained solution, and optionally adjusting the dry matter content of the dispersion so obtained. The said dispersion can also be made to gel. The invention is also directed to the use of the dispersion as a binder.

Description

technical field [0001] The present invention relates to colloidal silicate dispersions, preferably having a low alkali content and additionally containing aluminum oxide, and to gels formed from the dispersions by coagulation or gel formation. The invention also relates to a process for the preparation of such dispersions using a particulate silicate mineral raw material comprising silica and alumina. In addition, the invention also relates to the use of the dispersions obtained, in particular as materials having adhesive capabilities, i.e. as adhesives or as adhesive components in adhesive compositions, including as coating Substances or adhesives, or as an adhesive component in coating substances and adhesive compositions. In particular, the material of the invention finds use in construction materials, especially as a binder in stone fiber production, or in cemented or concreted products. Background technique [0002] Water glass is usually made by melting silica sand w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C01B33/14C04B12/00C04B12/04C04B14/04C04B28/00C04B28/24
CPCB01J13/0013C04B12/04B01J13/006B01J13/0034B01J13/0047C04B12/00B01J13/0039C04B28/24C04B28/00C04B14/38
Inventor 迈克尔·佩兰德琼·利贝尔
Owner PAROC GRP OY
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