Novel dry mineral pigment containing calcium carbonate, aqueous suspension containing said pigment, and the uses thereof

A technology of mineral pigments, calcium carbonate, applied in the direction of fibrous fillers etc.

Active Publication Date: 2007-05-16
OMYA INT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] But all these documents do not enable a person skilled in the art to control the rheology of the formulations used in the manufacture of automobile bodies while maintaining the robustness of the polymers that make up the body

Method used

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  • Novel dry mineral pigment containing calcium carbonate, aqueous suspension containing said pigment, and the uses thereof
  • Novel dry mineral pigment containing calcium carbonate, aqueous suspension containing said pigment, and the uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] This example serves to illustrate the prior art and relates to various preparation methods of prior art pigments.

[0082] test n o 1

[0083] This test illustrates the preparation of a prior art pigment in which 0.5 kg of natural calcium carbonate of the Norwegian marble type, calculated as dry pigment, is diluted with distilled water in a 10 liter container using a Sedigraph from the company Micromeritics TM The particle size distribution measured by the 5100 is 65% by weight of particles having a diameter of less than 1 μm in the form of a 75% dry content aqueous suspension dispersed with 0.6% polyacrylate de soude until diluted to obtain dry matter Aqueous suspension at a concentration of 15% by weight. The suspension thus formed was then treated with 10% phosphoric acid (in a 10% by weight solution) at 65° C. for 20 minutes with stirring at 500 rpm for 20 minutes. Thereafter, the pH is adjusted to 8-8.5 with a lime suspension having a concentration equal to 10%...

Embodiment 2

[0099] This example illustrates the invention and relates to a process for the production of dry mineral pigments comprising products formed in situ from multiple reactions between natural calcium carbonate and a or a variety of medium strength to strong H 3 o + One or more reaction products of the ion donor and the carbonate with the gaseous CO formed in situ and / or supplied externally 2 One or more reaction products of and one or more compounds of general formula R-X; and mineral pigments obtained by the process.

[0100] test n o 4

[0101]This test illustrates the invention and relates to the process for obtaining the pigments of the invention, wherein the treatment with a 2% mixture of palmitic and stearic acids (approximately 1 / 1 weight ratio) takes place during the reaction of calcium carbonate with phosphoric acid.

[0102] For this purpose, in a 10 liter ESCO reactor, 0.746 kg of natural calcium carbonate of the French chalk type, calculated as dry pigment, was di...

Embodiment 3

[0216] This example relates to the use of pigments according to the invention as rheology modifiers for the preparation of polyvinyl chloride (PVC) based plastisols.

[0217] The filled plastisols were prepared by mixing the unfilled PVC-based plastisols with calcium carbonate or the mineral pigment to be tested in a container with a diameter of 7 cm and homogenizing with a spatula. The total weight of the mixture is 200 g. Subsequent use of Pendraulik TM The mixture was dispersed for 2 minutes in an LD50 laboratory mixer with a dispersing disc having a diameter of 5 cm and a rotational speed of the disc at 2700 rpm (manually adjusted to position 3).

[0218] When dispersion is complete, use Rheomat 120 at 20°C TM Viscosity is measured by machine according to standard DIN 125.

[0219] After aging at a temperature of 23°C for 24 hours and 30 days, the pour point was determined using the Bingham model well known to those skilled in the art.

[0220] In all tests of this ex...

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Abstract

The invention relates to a method for producing a dry mineral pigment containing a product formed in situ by the multiple reaction of a calcium carbonate with the reaction product or products of said carbonate with at least one medium-strength to high-strength H3O<+> ion donor; with the reaction product or products of said carbonate with gaseous CO<2> formed in situ and/or from an external supply; and with at least one compound of formula R-X. The invention also relates to the mineral pigment obtained by said method, and to the applications thereof in the paint and/or plastics industries.

Description

technical field [0001] The present invention relates to the field of mineral fillers, and more particularly to mineral pigments comprising a dry product formed in situ by multiple reactions between calcium carbonate and one or more Medium Strength to Strong H 3 o + One or more reaction products of the ion donor and the carbonate with the gaseous CO formed in situ and / or supplied externally 2 One or more reaction products of and one or more compounds of the general formula R-X, the mineral pigments are used in paints and / or plastics and / or coatings and / or adhesives (mastics) applications, especially as able to control Rheology-adjusting fillers that maintain viscosity while maintaining the solidity of polymeric materials, and are more particularly used in the automotive industry as protective coatings for automotive underbody. [0002] The invention also relates to a process for the production of dry mineral pigments comprising products formed in situ from multiple reactions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02
CPCC09C1/021C01P2004/61C01P2006/22C01P2004/62C01P2006/12C09C1/02
Inventor M·布里R·伯克哈尔特P·哈尔德曼
Owner OMYA INT AG
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