Method for producing a press pad

Abstract

A thread made from extruded silicone rubber that is cross-linked after the extrusion and woven into a fabric having warp threads and/or weft threads and a coating including cross-linked silicone rubber, the thread or the coating including a fluorinated rubber portion. The invention also relates to a method for producing such threads and woven fabrics. The object of the invention is to improve thermal and chemical resistance. To this end the fluorinated rubber part is produced only by surface fluorination of the cross-linked thread or the coating by means of a fluorinated gas.

Claims

1. A method for producing a press pad, the method comprising the steps: providing an elastomeric material matrix that is resistant to temperatures above 200 degrees C. and that includes an additive that increases heat conductivity; producing a thread from the elastomeric material matrix; producing a fabric with warp threads and weft threads from the thread; producing the press pad from the fabric, wherein the additive is dispersed in an organically modified siloxane and worked into the elastomeric material matrix together with the organically modified siloxane, and wherein the organically modified siloxane is organically modified polysiloxane with organic polymers on an acrylate base that are arranged along the chain with 30% by weight hexagonal boron nitride and 5% by weight multiwall carbon nanotubes dispersed therein.

2. The method according to claim 1, wherein the thread includes a stabilizing core thread.

3. The method according to claim 2, wherein the core thread is made from metal.

4. A method for producing a press pad, the method comprising the steps: coating an elastomeric material matrix that is resistant to temperatures above 200 degrees C. and that includes an additive that increases heat conductivity onto a fabric that includes warp threads weft threads; and crosslinking the high temperature resistant elastomeric material matrix after the coating, wherein the additive is dispersed in an organically modified siloxane and worked into the high temperature resistant elastomeric material matrix together with the organically modified siloxane, and wherein the organically modified siloxane is organically modified polysiloxane with organic polymers on an acrylate base that are arranged along the chain with 30% by weight hexagonal boron nitride and 5% by weight multiwall carbon nanotubes dispersed therein.

5. The method according to claim 1, wherein the high temperature resistant elastomeric material matrix is made from a silicone rubber, a fluor silicone rubber, a fluor rubber or a copolymer that includes silicone rubber and fluor silicone rubber.

6. The method according to claim 1, wherein the organically modified siloxane has a comb or block structure that is modified relative to a polydimethylsiloxane, wherein methyl groups are substituted by acrylate, epoxy, phenyl, hydroxyl, amino, carboxyl or alky groups.

7. The method according to claim 1, wherein the worked in portion is between 10 and 95% by weight of the fabric and/or a portion of the additive is between 10 and 95% by weight of the worked in portion.

8. The method according to claim 1, wherein the additive has a specific heat conductivity of at least 1 W/mK.

9. The method according to claim 1, wherein the additive is made from silicone oxide, aluminum oxide, calcium carbonate, hexagonal boron nitride, a carbon modification, graphite, soot, carbon fibers, pure metal powder, copper, silver aluminum or from a nanoscale material that includes single wall or multiple carbon nanotubes.

10. The method according to claim 1, wherein the additive is surface treated with silanes or silane-based compounds.

11. The method according to claim 4, wherein the high temperature resistant elastomeric material matrix is made from a silicone rubber, a fluor silicone rubber, a fluor rubber or a copolymer that includes silicone rubber and fluor silicone rubber.

12. The method according to claim 4, wherein the organically modified siloxane has a comb or block structure that is modified relative to a polydimethylsiloxane, wherein methyl groups are substituted by acrylate, epoxy, phenyl, hydroxyl, amino, carboxyl or alkyl groups.

13. The method according to claim 4, wherein the worked in portion is between 10 and 95% by weight of the fabric and/or a portion of the additive is between 10 and 95% by weight of the worked in portion.

14. The method according to claim 4, wherein the additive has a specific heat conductivity of at least 1 W/mK.

15. The method according to claim 4, wherein the additive is made from silicone oxide, aluminum oxide, calcium carbonate, hexagonal boron nitride, a carbon modification, graphite, soot, carbon fibers, pure metal powder, copper, silver aluminum or from a nanoscale material that includes single wall or multiple carbon nanotubes.

16. The method according to claim 4, wherein the additive is surface treated with silanes or silane-based compounds.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) The invention is subsequently described based on an advantageous embodiments. A first elastomeric material mix is made from 45% by weight silicone elastomeric material HTV with vinyl groups non crosslinked with the catalyst component Di-(2.4 dichlorbenzoyl)peroxide and 55% by weight organically modified siloxane type Tegosil HT2100 with filling material Al.sub.2O.sub.3.

(2) A second elastomeric material mix is made from 50% by weight silicone elastomeric materials HTV with 5% by weight fluor silicone elastomeric material non-crosslinked with catalyst component Di (2.4 dichlorobenzoyl)peroxide and 50% by weight organically modified polysiloxane with organic polymers on an acrylate base that are arranged along the chain with 30% by weight hBN and 5% by weight MWKN dispersed therein.

(3) After tempering at approximately 200 degrees C., the first elastomeric material mix has a heat conductivity of 0.4 W/mK and a Shore hardness of 55 and the second elastomeric mix has a heat conductivity of 0.75 W/mK and a hardness of 60. The two elastomeric material mixes have a significantly increased heat conductivity compared to silicone elastomeric material HTV without modification (0.24 W/mK, Shore hardness 68), whereas the shore hardness had a reduced value which is advantageous for the reset properties of the press pads.

(4) From the elastomeric matrix materials a thread a thread was produced, then a fabric with warp threads and weft threads was produced from the thread and eventually a press pad was produced from the fabric. Measurements at the press pads have shown that heat conductivity is doubled or tripled.