Composite material, molded body, electronic device with molded body, and method for fabricating a molded body

Patent metadata

Field	Value
Publication number	US-9239251-B2
Application number	US-201113813558-A
Country	US
Kind code	B2
Filing date	Jul 11, 2011
Priority date	Aug 5, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A composite material comprises a polymer matrix; and zeolite, which is bonded in the polymer matrix; wherein the percent of volume of the zeolite in the volume of the composite material amounts to at least 50%, in particular at least 65%. The polymer matrix can in particular comprise a polymer, which is selected from a group of polymers that consist of fluoroplastics, polyaryletherketones, sulphur-containing polymers and high heat resistant polymers. The zeolite comprises in particular a zeolite of type A, in particular a zeolite 4A or 3A.

First claim

The invention claimed is:

1. An electronic gauge pressure measurement transducer, which comprises:
at least one housing;
at least one inner space, which contains an electronic circuit;
a gauge pressure sensor for measuring the difference between a pressure of a medium and an ambient atmospheric pressure near said gauge pressure sensor; and
an atmospheric pressure line in order to expose said gauge pressure sensor to the atmospheric pressure; and
at least one molded body comprising a composite material comprising: a polymer matrix; and zeolite, which is bonded in said polymer matrix,
wherein:
the portion of volume of said zeolite in the volume of the composite material amounts to at least 65%;
said molded body is arranged in said inner space;
the volume of said molded body amounts to not less than 40% of the free volume of said inner space;
water vapor can enter into said at least one housing via said atmospheric pressure line;
said atmospheric pressure line runs through the molded body; and
said molded body is capable of adsorbing moisture ingressing via said atmospheric pressure line and thereby prevent water from condensing onto said electronic circuit over a time period of years.

2. The transducer according to claim 1 , wherein:
the volume of said molded body amounts to not less than 60% of the free volume of said inner space.

3. The transducer according to claim 1 , wherein:
said polymer matrix comprises a polymer, which is selected from a group of polymers that consists of fluoroplastics, polyaryletherketones, sulphur-containing polymers and high heat resistant polymers.

4. The transducer according to claim 1 , wherein:
said zeolite comprises a 4A or 3A zeolite.

5. The transducer according to claim 1 , wherein:
the average density of said composite material, in a dry condition, amounts to not more than 1.7 g/cm 3 .

6. The transducer according to claim 1 , wherein:
the average density of said composite material, in a dry condition, amounts to not more than 1.5 g/cm 3 .

7. The transducer according to claim 1 , wherein:
the packing density of said zeolite in said composite material in a dry condition amounts to not less than 0.8 g/cm 3 .

8. The transducer according to claim 1 , wherein:
the packing density of said zeolite in said composite material in a dry condition amounts to not less than 1.0 g/cm 3 .

9. The transducer according to claim 1 , wherein:
for the volume V min of a minimal convex hull of said molded body and for the surface area A min of the minimal convex hull, V min 2/3 /A min >1/20 is true.

10. The transducer according to claim 1 , wherein:
for the volume V min of a minimal convex hull of said molded body and for the surface area A min of the minimal convex hull, V min 2/3 /A min >1/10 is true.

11. The transducer according to claim 1 , wherein:
for the volume V K of said molded body and for the surface area A K of said molded body, V K 2/3 /A K >1/30 is true.

12. The transducer according to claim 1 , wherein:
for the volume V K of said molded body and for the surface area A K of said molded body, V K 2/3 /A K >1/20 is true.

13. The electronic measurement device according to claim 1 , wherein:
for the volume V K of said molded body and for the surface area A K of said molded body, V K 2/3 /A K >1/15 is true.

Assignees

• Lopatin Sergej
• Uehlin Thomas
• Gugenberger Alexander
• Hugel Michael
• Roβberg Andreas
• Endress & Hauser Gmbh & Co Kg

Inventors

• Lopatin Sergej
• Uehlin Thomas
• Gugenberger Alexander
• Hugel Michael
• Roβberg Andreas

Classifications

• G01D11/245 Primary

  Housings for sensors · CPC title

• B01J20/28042

  Shaped bodies; Monolithic structures · CPC title

• B01J20/3007

  Moulding, shaping or extruding · CPC title

• B01J20/183

  Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation · CPC title

• B01J20/28026 Primary

  Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin · CPC title