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Silicone compositions, articles, and methods of making such silicone compositions

A technology of siloxane and composition, which is applied in the field of manufacturing the siloxane composition, and can solve the problems of reducing hardness, low-viscosity siloxane preparations, difficulty in processing, and limitations

Inactive Publication Date: 2012-05-23
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, a lower percentage of silicon filler is used to reduce hardness, which results in a large reduction in viscosity of the formulation
Resulting low viscosity silicone formulations are difficult to process in conventional silicone manufacturing equipment
Additionally, product manufacturers using such silicone formulations are limited in their ability to customize the formulation to better suit a particular product or process
As a result, manufacturers are often faced with a choice between desired hardness and desired viscosity, with no option for both

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] This example demonstrates the synthesis of an in-situ softening promoter (ISP). A solution comprising 200 grams (g) of diethyl ether, 9.63 g (0.065 mol) of vinyltrimethoxysilane (Sigma Aldrich), and 3.8 g (0.035 mol) of trimethylchlorosilane (Sigma Aldrich) was mixed with 100 g of water were mixed for 1 hour at ambient conditions. After removing the aqueous layer, the organic layer was washed 4 times with distilled water to provide a neutral pH. The remaining water in the organic layer was removed with anhydrous magnesium sulfate. A viscous liquid (7.2 g) was obtained after evaporation of the solvent in a rotary evaporator.

example 2

[0027] This example demonstrates a method for preparing low hardness LSR. Five formulations were prepared for performance studies. Specifically, three vinyl-containing silsesquioxanes were added to two commercial LSR formulations. The first vinyl-containing silsesquioxane was the in-situ softening accelerator discussed in Example 1. Two other vinyl-containing silsesquioxanes are commercially available from Gelest. This silicon LSR is a product of Rhodia Silbione 4330 and 4305. The data for the compositions are shown in Table 1. This vinyl-containing silsesquioxane is easily incorporated into these LSRs in a two-part mixing step using a mixer. The additive is loaded in an amount between about 0.5% and 1% by weight of LSR (phr, parts in percent rubber).

[0028] Formulations of Table 2 Examples

[0029] masterbatch

example 3

[0031] The mechanical properties of these 6 compositions were evaluated as well as these comparative reference substances. The test panels were compression molded at 177°C for 5 minutes and post cured at 177°C for 4 hours. Tensile properties, such as tensile strength and elongation at break, were evaluated on an Instron using ASTM D-412. Tear testing was performed on an Instron according to ASTM D-624 and hardness measurements were made on a Shore A durometer following the procedure of ASTM D-2240. Viscosity measurements were carried out on a TA Instrument ARES rotational rheometer at a frequency of 1 Hz and at 25°C. These results are summarized in Table 3.

[0032] Table 3 Properties of silicone compositions

[0033] Hardness (Shaw

[0034] The in-situ softening accelerator is used to convert conventional LSR to low hardness LSR. When viewed with compositions 1 to 6, the softness of the resulting rubber can be controlled with the amount of in situ softening ac...

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Abstract

An article includes a silicone formulation and an in situ softening promoter. The silicone formulation has a shore A durometer and the in situ softening promoter decreases the shore A durometer of the silicone formulation by at least about 35%.

Description

technical field [0001] The present disclosure generally relates to a silicone composition, articles made from the silicone composition, and methods for making the silicone composition. Background technique [0002] Curable silicone compositions are used in a variety of applications ranging from the automotive industry to medical devices. A typical commercial formulation of a liquid silicone rubber (LSR) composition includes a multicomponent mixture of a vinyl-containing polydiorganosiloxane, a hydrogen-containing polydiorganosiloxane, a catalyst, and a filler. Typically, the commercial formulation is a two-part formulation that is mixed together prior to use. Once the commercial formulation is mixed, the silicone composition is then molded or extruded and cured. [0003] In many cases, silicone compositions with low hardness are required for different applications. In some instances, the silicone formulation is modified to provide a silicone formulation with low hardness....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04
CPCC08G77/70C08L83/04C08G77/18C08G77/20C08G77/12Y10T428/31663C08L83/00
Inventor 区端力
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP
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