One-component addition type liquid silicone rubber and preparing method thereof

A technology of liquid silicone rubber and addition type, which is applied in the field of one-component addition type liquid silicone rubber and its preparation, can solve the problems of troublesome assembly, lack of adhesiveness, inconvenient use, etc., and achieves low cost and good mechanical properties. , a wide range of effects

Inactive Publication Date: 2013-09-18
JIANGSU TIANCHEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary silicone rubber is only suitable for making prefabricated parts such as regular sealing rings, sealing rings, and sealing strips. This accessory is troublesome to assemble and has no adhesiveness, so it is extremely inconvenient to use. Compared with solid silicone rubber, liquid silicone rubber has excellent Excellent fluidity, excellent processing performance, more flexible and faster under different conditions of use

Method used

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  • One-component addition type liquid silicone rubber and preparing method thereof
  • One-component addition type liquid silicone rubber and preparing method thereof
  • One-component addition type liquid silicone rubber and preparing method thereof

Examples

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preparation example Construction

[0036] The preparation method of the polysiloxane II described in the embodiment is: from 100 parts by mass of octamethylcyclotetrasiloxane, 0.2 to 0.3 parts by mass of tetravinylmethyldivinyldisiloxane, in tetramethyl Under the catalysis of ammonium hydroxide, polymerize at a constant temperature of 100°C for 2.5 hours, then raise the temperature to 150°C to equilibrate for 1 hour, then raise the temperature to 180°C, and release low-molecular substances under a vacuum of 200 poises. The prepared viscosity is 8000~ 10000cp, vinyl-terminated organopolysiloxane with a vinyl content of 2.5-5.0mol.%.

[0037] The platinum-gold complex is coordinated and synthesized by chloroplatinic acid and isopropanol, and the platinum content therein is 500-3000ppm. The preparation method of the platinum complex described in the examples is as follows: add 5 grams of chloroplatinic acid hydrate and 200 ml of isopropanol into a 500 ml four-necked flask, and heat up and reflux for 1 hour under n...

Embodiment 1

[0050] a. Preparation of base glue

[0051] ①In a 500L kneader, add 140kg of polysiloxane I with a viscosity of 1000cp (25°C) and a vinyl content of 1.2mol.%, and 100kg of fumed silica treated with a silane coupling agent for hydrophobic treatment, and knead it into Continue kneading at room temperature for 1 hour after dough;

[0052] ②Raise the temperature to 150-160°C, then knead at constant temperature for 1 hour;

[0053] ③ Vacuumize to a vacuum degree of 0.8MPa, continue kneading at 150-160°C for 3 hours under vacuum conditions, then stop vacuuming, cool down to 120°C, add 100kg with a viscosity of 1000cp (25°C) and vinyl content of 1.2mol .% polysiloxane I and 16kg of polysiloxane II with a viscosity of 10000cp (25°C) and a vinyl content of 5.0mol.%, mixed evenly to obtain the base glue;

[0054] b. Preparation of one-component addition type liquid silicone rubber

[0055] In a 300L planetary mixer, add 200kg of the base glue prepared above, 4.5kg of prepared hydroge...

Embodiment 2

[0061] a. Preparation of base glue

[0062] ①In a 500L kneader, add 140kg of polysiloxane I with a viscosity of 1000cp (25°C) and a vinyl content of 1.2mol.%, and 100kg of fumed silica treated with a silane coupling agent for hydrophobic treatment, and knead it into Continue kneading at room temperature for 1 hour after dough;

[0063] ②Raise the temperature to 150-160°C, then knead at constant temperature for 1 hour;

[0064] ③ Vacuumize to a vacuum degree of 0.8MPa, continue kneading at 150-160°C for 3 hours under vacuum conditions, then stop vacuuming, cool down to 120°C, add 80kg .% polysiloxane I and 36kg of polysiloxane II with a viscosity of 10000cp (25°C) and a vinyl content of 5.0mol.%, mixed evenly to obtain the base glue;

[0065] b. Preparation of one-component glue

[0066] In a 300L planetary mixer, add 200kg of the base glue prepared above, 6.2kg of prepared hydrogen-containing polysiloxane and 0.08kg of acetylenic alcohol inhibitors, stir and mix for 30min, ...

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Abstract

The invention discloses one-component addition type liquid silicone rubber and a preparing method thereof. The one-component addition type liquid silicone rubber is formed by basic rubber, modified additives, platinum complexes, hydrogen-containing polysiloxane and alkynol inhibitors according to a certain ratio, wherein the basic rubber is formed by organic polysiloxanes and hydrophobic silicon dioxide with different viscosities and vinyl contents at the vinyl sealing end. The preparing method includes basic rubber preparing and liquid silicone rubber preparing. The liquid silicone rubber is ultra-low in viscosity, good in flowing property, strong in adhesion, convenient to use, easy to operate and good in storage stability. The preparing method is simple, practical, low in cost and applicable to large-scale production and has an industrial application value.

Description

technical field [0001] The invention relates to the technical field of silicone rubber materials, in particular to a one-component addition type liquid silicone rubber and a preparation method thereof. Background technique [0002] Because silicone rubber has excellent aging resistance, electrical insulation and good mechanical strength, it is widely used in various industries. Ordinary silicone rubber is only suitable for making prefabricated parts such as regular sealing rings, sealing rings, and sealing strips. This accessory is troublesome to assemble and has no adhesiveness, so it is extremely inconvenient to use. Compared with solid silicone rubber, liquid silicone rubber has excellent Excellent fluidity, excellent processing performance, more flexible and faster under different conditions of use. Therefore, if it is possible to develop a liquid silicone rubber with good fluidity, strong adhesion, convenient use, easy operation, and good storage stability, it will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/06C08K3/36C08K5/05
Inventor 王超陆磊徐文俊王芳
Owner JIANGSU TIANCHEN NEW MATERIALS
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