Foamed liquid silicon rubber and preparation method thereof

A liquid silicone rubber and polysiloxane technology, which is applied in the field of foamed silicone rubber and its preparation, can solve the problem that powder foaming agent and silicone rubber are not mixed evenly, specific gravity, elasticity, hardness and other properties cannot meet requirements, etc. problem, to achieve the effect of complete foaming, smooth surface and high elasticity

Inactive Publication Date: 2014-08-06
NINGBO YINRUI ORGANO SILICON TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a foamed silicone rubber composition and a preparation method thereof, to solve the problem that the traditional powder-type foaming agent is not mixed uniformly with silicone rubber, so that the specific gravity of the foamed silicone rubber composition prepared , elasticity, hardness and other technical problems that cannot meet the requirements

Method used

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  • Foamed liquid silicon rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0044] Example 2: Preparation of foamed liquid silicone rubber with 20% mixed air blowing agent (wt%)

[0045] Step 1): Add I. Polysiloxane with a viscosity of 5000-10000mPa·s (25°C) and a vinyl content of 0.25%-0.5% (wt%) in a strong stirring mixer, the addition amount is 20 parts; and Ⅱ. The amount of polysiloxane with a viscosity of 10000-40000mPa·s (25°C) and a vinyl content of 0.15%-0.5% (wt%) is 20 parts.

[0046] Further, hexamethyldisilazane coupling agent was added as fumed silica for hydrophobic treatment, 20 parts were added, and stirred and mixed for 1 hour to form agglomerates.

[0047]Then heat up to about 150°C and stir at constant temperature and pressure for 2 hours, then vacuum stir at about 150°C for 3 hours and then stop the vacuum.

[0048] After cooling down to 90°C, add Ⅰ. Polysiloxane with a viscosity of 5000-10000mPa·s (25°C) and a vinyl content of 0.25%-0.5% (wt%), add 15 parts, mix evenly and discharge Grind into a base material, ie a low molecular...

Embodiment 3

[0052] Example 3: Preparation of foamed liquid silicone rubber with 60% mixed air blowing agent (wt%)

[0053] Step 1): Add III. Polysiloxane with a viscosity of 1000-2000mPa·s (25°C) and a vinyl content of 0.3%-1.0% (wt%) in a strong stirring mixer, the addition amount is 30 parts; and Ⅱ. The dosage of polysiloxane with a viscosity of 10000-40000mPa·s (25℃) and a vinyl content of 0.15%-0.5% (wt%) is 20 parts, and the dosage is 15 parts;

[0054] Further, hexamethyldisilazane coupling agent was added as fumed silica for hydrophobic treatment, 20 parts were added, and stirred and mixed for 1 hour to form agglomerates.

[0055] Then heat up to about 150°C and stir at constant temperature and pressure for 2 hours, then vacuum stir at about 150°C for 3 hours and then stop the vacuum.

[0056] After cooling down to 90°C, add Ⅰ. Polysiloxane with a viscosity of 5000-10000mPa·s (25°C) and a vinyl content of 0.25%-0.5% (wt%), add 15 parts, mix evenly and then discharge and grind For...

Embodiment 4

[0060] Example 4: Preparation of foamed liquid silicone rubber with 80% mixed air blowing agent (wt%)

[0061] Step 1): Add III. Polysiloxane with a viscosity of 1000-2000mPa·s (25°C) and a vinyl content of 0.3%-1.0% (wt%) in a strong stirring mixer, the addition amount is 30 parts, and Ⅰ. Polysiloxane with a viscosity of 5000-10000mPa·s (25°C) and a vinyl content of 0.25%-0.5% (wt%), the dosage is 15 parts.

[0062] Add hexamethyldisilazane coupling agent as fumed silica for hydrophobic treatment, add 20 parts, stir and mix for 1 hour.

[0063] Then heat up to about 150°C and stir at constant temperature and pressure for 2 hours, then vacuum stir at about 150°C for 3 hours and then stop the vacuum.

[0064] After cooling down to 90°C, add Ⅳ. Polysiloxane with a viscosity of 1000-5000mPa·s (25°C) and a vinyl content of 1.0%-10% (wt%), add 5 parts, mix evenly and then discharge and grind into the base material; and divide the base material into two equally;

[0065] Step 2) ...

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Abstract

The invention discloses a preparation method of foamed liquid silicon rubber. The preparation method comprises the steps as follows: 1) a basic material is prepared frompolysiloxane composition and reinforcing filler and divided into two parts; 2) a catalyst is added to one part to prepare a material A; 3) an inhibitor and a cross-linking agent are added to the other part to prepare a material B; 4) the material A and the material B are mixed, a gas mixture with the weight ratio of 20-85%, preferably, 60% is added, the gas mixture consists of air, oxygen and CO2, and a finished foamed liquid silicon rubber product is obtained after heating and curing. According to the preparation method, the prepared foamed rubber is even in foam size, complete in foaming, high in elasticity, high in toughness, smooth in surface, capable of saving the production cost and widely applicable to various production fields of the industrial injection molding process.

Description

technical field [0001] The invention relates to a silicone rubber and a preparation method thereof, in particular to a foamed silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is one of the important silicone products. Silicone rubber has many unique and excellent properties and is widely used in aviation, aerospace, electrical and electronic, light industry, machinery, construction, chemical industry, medicine, daily necessities, etc. Liquid silicone rubber is a type of silicone rubber relative to mixing type semi-solid silicone rubber and common room temperature vulcanized one-component silicone rubber. [0003] The main existing method is to prepare the thermoplastic resin hollow particle powder that expands when heated or the pre-expanded thermoplastic resin hollow particle powder (to obtain a low specific gravity silicone rubber composition) as a foaming agent and silicone rubber composition in proportion. The hollow parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08L83/05C08J9/12C08K9/06C08K3/36
Inventor 苏泉法
Owner NINGBO YINRUI ORGANO SILICON TECH DEV
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