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Dispersion comprising titanium dioxide and polycarboxylate ether

A polycarboxylate ether, titanium dioxide technology, applied in the field of concrete additives, can solve the problems of no polyester type, no range of polycarboxylate amount, no polycarboxylate step method, etc.

Inactive Publication Date: 2009-08-26
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, EP-A-1607378 has neither details on the type of polyester nor the range of amounts of polycarboxylate that must be added nor the manner in which the polycarboxylate is added

Method used

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  • Dispersion comprising titanium dioxide and polycarboxylate ether
  • Dispersion comprising titanium dioxide and polycarboxylate ether
  • Dispersion comprising titanium dioxide and polycarboxylate ether

Examples

Experimental program
Comparison scheme
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Embodiment

[0266] Analysis: The particle size of the dispersion is determined by means of dynamic light scattering, measuring device: Horiba LB-500. Relatively coarse powders P5 and P6 were measured by means of laser diffraction according to ISO 13320-1.

[0267] The BET surface area is determined according to DIN 66131.

[0268] Standard stuccoes are prepared according to DIN EN 196. The strength is tested according to DIN 1164 on a prism measuring 4x4x16cm.

[0269] materials used

[0270] P1: P25TiO 2 : BET surface area is 50m 2 / g, titanium dioxide content>99.50% by weight.

[0271] P2: Titanium dioxide powder according to WO 2005 / 054136, Example A7: BET surface area 91 m 2 / g.

[0272] P3: Titanium dioxide powder according to DE-A-102004001520, Example 12: BET surface area 43m 2 / g, the titanium dioxide content is 49% by weight, and the silicon dioxide content is 51% by weight.

[0273] P4: 200: BET surface area is 200±25m 2 / g, silica content>99.8% by weight.

[02...

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Abstract

The invention relates to a binder-free dispersion comprising titanium dioxide and at least one water-soluble polycarboxylate ether, wherein the silicon dioxide has a BET surface area of ​​20 to 400 m 2 / g, the water-soluble polycarboxylate ether is based on a copolymer of at least one oxyalkylene glycol compound and at least one unsaturated monocarboxylic acid derivative or dicarboxylic acid derivative, the dispersion The titanium dioxide content is 5 to 50% by weight, based on the total amount of the dispersion.

Description

technical field [0001] The present invention relates to concrete additives based on titanium dioxide and polycarboxylate ethers. Background technique [0002] It has been known for a long time, for example, from US 3135617 that an acceleration of the settling can be achieved by finely divided amorphous silica. However, this has not been confirmed, since the applicability of fresh concrete is thus greatly limited. [0003] WO 01 / 90024 discloses a concrete composition comprising aggregates, hydraulic binder, silica sol and polycarboxylate. The BET surface area of ​​the silica sol is preferably 300-900m 2 / g. Silica sols are individual particles with a diameter of 3-50 nm that are only stable in dispersion. They are highly reactive in cement or concrete compositions, but have no filler effect. This may be due to the fact that silica sols are rapidly soluble in alkaline media due to their very low particle size. In order to be able to observe high early strengths when usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B22/06
CPCC04B28/02C04B40/0039C04B14/305C04B20/008C04B24/267C04B24/2694
Inventor 克里斯托夫·托恩特拉普沃尔夫冈·洛茨克劳斯·德勒克里斯蒂安·许布施菲利普·威兰哈拉尔德·格拉斯尔斯特凡尼·朔伊尔埃娃·耶茨尔斯佩格克斯廷·贝谢尔
Owner CONSTR RES & TECH GMBH