Surface-treated calcium carbonate, method for production thereof and resin composition comprising said calcium carbonate
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A technology of resin composition and surface treatment, which is applied in the field of calcium carbonate and can solve problems such as price difference
Inactive Publication Date: 2005-11-02
MARUO CALCIUM COMPANY
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Problems solved by technology
In particular, among acrylic resins, considering not only weight reduction, but also the price difference with vinyl chloride resins, it is being considered to mak
Method used
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Embodiment 1
[0170] Add citric acid as a complex forming substance to calcium hydroxide in an amount of 1.7% to milk of lime at a temperature of 10°C and a concentration of 8%, and introduce 1700 L / hr per 1 kg of calcium hydroxide into the slurry 20% carbon dioxide gas to make calcium carbonate slurry. Then adjust the calcium carbonate slurry to a concentration of 10%, and carry out stirring aging at a temperature of 45-50° C. for 50 hours. Average particle diameter (Dx) after aging = 0.20 μm. Add 10% sodium stearate thermally dissolved in warm water to the calcium carbonate slurry to make it 15% relative to the solid content of calcium carbonate, and stir to make the surface treatment agent fully adsorbed on the surface of calcium carbonate, and then dehydrate , dried, made into powder, synthetic BET specific surface area (Sw) = 48m 2 / g of calcium carbonate formed by surface treatment with an organic surface treatment agent. In addition, the heat loss rate (Tg) of the surface-treated ...
Embodiment 2
[0172] Except that the concentration of the calcium carbonate slurry was changed to 7%, the calcium carbonate formed by the surface treatment of the organic surface treatment agent was synthesized by the same preparation method as in Example 1. The physical property values of the surface-treated calcium carbonate obtained are listed in Table 1.
Embodiment 3
[0174] Except changing the curing time to 120 hours, by the same preparation method as in Example 2, the calcium carbonate formed through the surface treatment of the organic surface treatment agent was synthesized. The physical properties of the resulting surface-treated calcium carbonate are listed in Table 1.
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Property
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Specific surface area
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Abstract
A surface-treated calcium carbonate, characterized in that it comprises calcium carbonate surface-treated with an organic agent for surface treatment, and has respective specific ranges of values for a BET specific surface area (Sw), a weight reduction by heat per unit specific surface area (As), an average pore diameter (Dxp) at which an increase in mercury penetration takes a maximum value in a specific range of pore diameter distribution by the mercury porosimetry, and an amount of the average pore diameter [a maximum value of the increase in mercury penetration (Dyp)/ an average pore diameter (Dxp)] and a method for producing the calcium carbonate which comprises adding a complex-forming material to a calcium hydroxide slurry, followed by blowing a carbon dioxide gas, to synthesize calcium carbonate, adjusting a calcium carbonate concentration, followed by aging, and treating the surface of the product with an organic agent for surface treatment. The surface-treated calcium carbonate is useful especially for a resin and can be used for producing a resin composition having improved adhesion to an article to be attached and forming a tough coating film.
Description
technical field [0001] The present invention relates to calcium carbonate treated with an organic surface treatment agent, a preparation method thereof, and a resin composition mixed with the calcium carbonate. More specifically, it relates to calcium carbonate treated with an organic surface treatment agent, its production method, and a resin composition characterized by mixing the calcium carbonate, which is used, for example, in When curing resins represented by sealants and adhesives, provide a resin composition that has viscous and thixotropic effects and has excellent joint conformability; for example, when mixed with paints, inks, plasticizers When in a sol, it provides a resin composition that not only has high gloss, high thixotropy, and anti-sagging properties, but also obtains a high-strength coating film. Background technique [0002] Calcium carbonate is widely used as a filler or pigment in plastics, coatings, inks, sealants, adhesives, paper, rubber, etc. Fo...
Claims
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Application Information
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