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Acid resistant particles of an alkaline earth metal carbonate

A technology of alkaline earth metals and carbonates, applied in nanotechnology for materials and surface science, thin material processing, fibrous fillers, etc., can solve the problem of unsatisfactory performance of hydrophobic coated carbonate particles

Active Publication Date: 2013-06-05
益瑞石公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the performance of the prior art hydrophobically coated carbonate particles is still unsatisfactory in various aspects

Method used

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  • Acid resistant particles of an alkaline earth metal carbonate
  • Acid resistant particles of an alkaline earth metal carbonate
  • Acid resistant particles of an alkaline earth metal carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Example 1 (particles according to the invention)

[0096] In the first step, 500 liters of 200 g / L uncoated precipitated carbonic acid were treated with 2.8 kg stearin / 100 kg of PCC, i.e., 28 L of an aqueous emulsion (first coating agent) containing 10 wt % stearin Suspensions of calcium, said uncoated precipitated calcium carbonate characterized by a base particle size (d p ) is 70nm and the specific surface area (BET) is 20m 2 / g. The particles were exposed to the emulsion for 45 minutes at 75°C.

[0097] The particles were then separated from the emulsion by a filter, dried in an oven at 105°C until the water content was below 3 g / kg, and milled.

[0098] In a second step, 3.35 kg of stearin (second coating agent) was injected into the Cell Mill dryer containing 100 kg of previously coated PCC. Adjust the outlet temperature at 180-200°C. After 2 minutes, all solids were recovered.

Embodiment 2～5

[0108] Particles were prepared according to the procedure of Example 1, except that the precipitated calcium carbonate particles were coated with 4.5, 4.8, 5.5 and 6.9 kg of stearin per 100 kg of precipitated calcium carbonate, respectively.

Embodiment 6

[0110] Particles were prepared according to the procedure of Example 1, except that abietic acid was used instead of stearic acid to coat the precipitated calcium carbonate particles in an amount of 5.5 kg abietic acid per 100 kg precipitated calcium carbonate.

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Abstract

The invention relates to particles comprising an alkaline earth metal carbonate exhibiting a resistance to acids such that when suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g / L of citric acid monohydrate, 2.57 g / L of NaCl and 0.068 mol / L of NaOH, after 35 minutes of stirring at 25 °C and at 1 000 rpm, the pH value of the mixture is below 7.00. The invention also relates to a process for the preparation of said particles, compositions containing said particles and the use thereof.

Description

technical field [0001] The present invention relates to particles of alkaline earth metal carbonates, preferably CaCO 3 . The particles exhibit improved acid resistance and are suitable as additives for polymer compositions. Background technique [0002] Fine ground calcium carbonate or precipitated calcium carbonate are known as fillers for, for example, rubber, plastics, paper or paints. Likewise, it is known that the dispersibility of calcium carbonate particles in a substance or mixture to which calcium carbonate particles are added as fillers, or the affinity of the particles therefor, can be improved or enhanced by surface treatment with, for example, fatty acids or salts or esters thereof. The treatment makes the surface of the material particles more suitable for binding to the hydrophobic host. In particular, the hydrophobic coating of the fatty acid or its salt or its ester of the carbonate particles not only improves the dispersibility but also stabilizes the v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02
CPCC01P2006/12C01P2004/64B82Y30/00C09C1/02C01P2006/22C01P2002/88C01P2004/62C09C1/021C01P2004/61C01P2004/02Y10T428/2991
Inventor 卡里纳·卡瓦利耶格耶·罗达里迪迪埃·西罗伯托·罗萨
Owner 益瑞石公司
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