Reactive liquid ceramic binder resin

a liquid ceramic and resin technology, applied in the field of reactive liquid ceramic binder, can solve the problems of high firing temperature, inability to obtain sufficient high green strength of ceramic products molded from ceramic particles, and insufficient production of homogenous mixtures with ceramic materials, so as to reduce nox emission, reduce energy consumption in the production of ceramic products, and reduce the effect of green strength

Inactive Publication Date: 2014-05-15
EVONIK GOLDSCHMIDT GMBH
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a ceramic binder that can be used to produce ceramic products with high green strength at temperatures below 30 °C (room temperature). This binder helps decrease the firing temperature and time, leading to decreased energy consumption and reduced CO2 and NOx emissions. The binder also helps shorten the firing times without affecting the strength of the ceramic products. Additionally, it does not form low-melting phases that are disadvantageous for the material properties. Furthermore, it imparts high dimensional stability to ceramic products and is also suitable for ceramic products susceptible to hydration.

Problems solved by technology

The use of these aforesaid solid siloxane compounds as ceramic binders has the disadvantage that very homogenous mixtures with ceramic materials are inadequately produced or they are not produced at all.
Moreover, with the use of such binders, a sufficiently high green strength of the ceramic product molded from ceramic particles cannot be obtained without a heat treatment at higher temperatures.
A further disadvantage of prior art binders is that very high firing temperatures, usually over 1000° C., are needed in order to obtain refractory ceramic products with adequate mechanical properties such as cold crushing strength.
Moreover, high pressures and long firing times are needed, which is associated with high energy consumption.
According to the teaching of WO 93 / 01146, molded, ceramic products with adequate green strength cannot be produced by non-plastic processing, for example uniaxially or isostatically pressed, by slip casting, by ramming, or spraying, in particular at temperatures below the softening point of the silicone resin or the like.
In addition, unshaped ceramic products, in particular refractory materials, cannot be produced with the binder and process described in WO 93 / 01146.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reactive liquid ceramic binder resin
  • Reactive liquid ceramic binder resin
  • Reactive liquid ceramic binder resin

Examples

Experimental program
Comparison scheme
Effect test

example 1

Binding Strength in Corundum Bricks

[0159]A high purity sintered alumina, T60 obtainable from the firm ALMATIS GmbH in Ludwigshafen, with the following grain size composition:

Coarse-grained1-2mm50 wt. %Medium-grained0.2-0.5mm10 wt. %Flourmm40 wt. %

was homogenously mixed with 4 wt. parts of compound A. For comparison, a molding mix was produced with 4 wt. parts of sulfite liquor (without compound A). Test pieces were made from the mixtures under a compression pressure of 100 MPa and then fired at 600° C. and 1500° C. for 2 hrs. After firing, the test pieces had the following characteristics:

WithWithoutcompound Acompound A600° C.1500° C.600° C.1500° C.Cold crushing strength (MPa)>50>100(as per DIN EN 993-1)

[0160]The differences in the development of the cold crushing strength depending on the firing temperature in samples with and without compound A are shown in FIG. 1.

[0161]The addition of compound A causes an enormous rise in the strength of the ceramics.

example 2

Binding Strength of Different Compounds

[0162]A high purity sintered alumina, T60 obtainable from the firm ALMATIS GmbH in Ludwigshafen, with the following grain size composition:

Coarse-grained1-2mm50 wt. %Medium-grained0.2-0.5mm10 wt. %Flourmm40 wt. %

was homogenously mixed with 4 wt. parts of compound A, B, C and D respectively. Test pieces were made from the mixtures under a compression pressure of 100 MPa and then fired at 600° C. for 2 hrs. After firing, the test pieces had the following characteristics:

CompoundABCDCold crushing strength (MPa)>50>80>60>10(as per DIN EN 993-1)

[0163]The addition of compounds A, B and C causes a large increase in the strength of the corundum bricks. The compound D develops an increased binding strength or strength of the corundum bricks after firing at 600° C.

example 3

Binding Strength of an Aqueous Emulsion

[0164]A high purity sintered alumina, T60 obtainable from the firm ALMATIS GmbH in Ludwigshafen, with the following grain size composition:

Coarse-grained1-2mm50 wt. %Medium-grained0.2-0.5mm10 wt. %Flourmm40 wt. %

was homogenously mixed with 5 wt. parts of a 50% aqueous emulsion of compound B. For comparison, a molding mix was produced with 4 wt. parts of sulfite liquor (without compound B). Test pieces were made from the mixtures under a compression pressure of 100 MPa and then fired at 600° C. and 1400° C. for 2 hrs. After firing, the test pieces had the following characteristics:

With emulsion ofWithoutcompound Bcompound B600° C.1400° C.600° C.1400° C.Cold crushing strength (MPa)>10>25(as per DIN EN 993-1)

[0165]The aqueous emulsion of compound B is suitable as a binder for corundum bricks.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
firing temperaturesaaaaaaaaaa
powder densityaaaaaaaaaa
Login to view more

Abstract

A reactive liquid ceramic binder suitable for the production of ceramic products from ceramic powders is provided. The reactive liquid ceramic binder contains organo-modified siloxane compounds, wherein the liquid organo-modified siloxane compounds contain organoalkoxysiloxane units according to general formula (I)whereinR1=alkyl radical and / or aryl radical,R2=H and / or alkyl radical with 1 to 4 carbon atoms,a≧0 and ≦2, andb>0 and ≦3,with the proviso that a+b≧1 and ≦4.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 789,982, filed Apr. 26, 2007, the entire content and disclosure of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a reactive liquid binder, which is suitable for the binding of ceramic particles for the production of ceramic products, in particular refractory ceramic products, from ceramic powders. The invention further relates to the use of the binder and a process for the production of the aforesaid ceramic products, and also ceramic products as such, wherein refractory ceramic products are particularly preferred according to the invention.BACKGROUND OF THE INVENTION[0003]Refractory ceramic products, also referred to below as “refractories”, are used for protection against high temperatures in many industrial plants. The most important refractory material types are:[0004]shaped dense products, with a porosity≦4...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): C04B35/64
CPCC04B35/64C04B35/043C04B35/101C04B35/103C04B35/565C04B35/6263C04B35/6264C04B35/6303C04B35/6316C04B35/66C04B2235/3217C04B2235/425C04B2235/483C04B2235/5427C04B2235/5436C04B2235/5445C04B2235/5472C04B2235/656C04B2235/96C08G77/18
Inventor EBBRECHT, THOMASVON RYMON LIPINSKI, TADEUSZSILBER, STEFANWEYERSHAUSEN, BERND
Owner EVONIK GOLDSCHMIDT GMBH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap