Controlling Curing Kinetics and Network Structure of Polysiloxanes Using Curing Accelerators and Inhibitors

Patent metadata

Field	Value
Publication number	US-2024384035-A1
Application number	US-202318197603-A
Country	US
Kind code	A1
Filing date	May 15, 2023
Priority date	May 15, 2023
Publication date	Nov 21, 2024
Grant date	—

Abstract

A composition for forming a siloxane elastomer material includes a siloxane monomer having at least one silane functional group, a hydrosilylation catalyst, and a radical initiator. A curing accelerator for converting a thermal-curable siloxane resin to a radiation-curable siloxane resin includes a radical initiator and a photosensitizing agent.

First claim

What is claimed is:

1 . A composition for forming a siloxane elastomer material, the composition comprising:
a siloxane monomer having at least one silane functional group; a hydrosilylation catalyst; and a radical initiator.

2 . The composition as recited in claim 1 , wherein the siloxane monomer is selected from the group consisting of: a linear hydride-terminated siloxane monomer, a branched hydride-terminated siloxane monomer, a multifunctional hydride-terminated siloxane monomer, and a combination thereof.

3 . The composition as recited in claim 1 , wherein the siloxane monomer comprises a silane-terminated siloxane monomer.

4 . The composition as recited in claim 1 , further comprising a vinyl-functionalized siloxane monomer.

5 . The composition as recited in claim 1 , wherein the radical initiator comprises a thermally activated initiator.

6 . The composition as recited in claim 5 , wherein an amount of the thermally activated initiator is in a range of greater than 0 to about 10 weight % of a total weight of the composition.

7 . The composition as recited in claim 1 , wherein the radical initiator comprises a photoactivated initiator.

8 . The composition as recited in claim 7 , wherein an amount of the photoactivated initiator is in a range of greater than 0 to about 5.0 weight % of a total weight of the composition.

9 . The composition as recited in claim 7 , wherein an amount of the photoactivated initiator is in a range of greater than 0.1 weight % to about 1.0 weight % of a total weight of the composition.

10 . The composition as recited in claim 7 , wherein the radical initiator includes a photosensitizing agent.

11 . The composition as recited in claim 10 , wherein an amount of the photosensitizing agent by weight is about equivalent to an amount of the photoactivated initiator.

12 . The composition as recited in claim 1 , wherein the radical initiator comprises a combination of a thermally activated initiator and a photoactivated initiator.

13 . The composition as recited in claim 1 , wherein the hydrosilylation catalyst is a metal-based catalyst having a metal selected from the group consisting of:
platinum, rhodium, iridium, and ruthenium.

14 . The composition as recited in claim 1 , wherein the composition is a resin for forming a structure using a stereolithography additive manufacturing technique.

15 . The composition as recited in claim 1 , wherein the composition is an ink for forming a structure using a direct ink writing additive manufacturing technique.

16 . A curing accelerator for converting a thermal-curable siloxane resin to a radiation-curable siloxane resin, the curing accelerator comprising:
a radical initiator; and a photosensitizing agent.

17 . The curing accelerator as recited in claim 16 , wherein the radical initiator comprises a photoactivated initiator and/or a thermally activated initiator.

18 . A method of forming a three-dimensional (3D) structure, the method comprising:
obtaining a composition, wherein the composition comprises a siloxane monomer having at least one silane functional group, a hydrosilylation catalyst, and a radical initiator; forming the 3D structure using the composition as a resin and/or ink with an additive manufacturing process; and curing the formed 3D structure for forming a siloxane elastomer material.

19 . The method as recited in claim 18 , wherein the radical initiator comprises a photoactivated initiator and/or a thermally activated initiator,
wherein the curing includes exposure to light.

20 . The method as recited in claim 18 , wherein the additive manufacturing technique is direct ink writing, wherein the composition is an ink extruded through a nozzle.

Assignees

• L Livermore Nat Security Llc

Inventors

• Ford Michael
• Lenhardt Jeremy M

Classifications

• C08G77/12 Primary

  containing silicon bound to hydrogen · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• B29C71/04

  by wave energy or particle radiation {, e.g. for curing or vulcanising preformed articles (during moulding, e.g. in a mould B29C35/08)} · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title