Addition type liquid fluorinated silicone rubber base rubber and preparation method thereof

A technology of liquid fluorosilicone and base rubber, applied in the field of addition type liquid fluorosilicone rubber base rubber and its preparation, can solve the problems of affecting vinyl crosslinking activity, impairing oil resistance of fluorosilicone rubber, product turbidity, etc. Steric hindrance effect, reducing shielding effect, ensuring the effect of cross-linking activity

CN105778104AActive Publication Date: 2016-07-20新元化学(山东)股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-07-20

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Abstract

The invention relates to addition type liquid fluorinated silicone rubber base rubber and a preparation method thereof. The base rubber has following structural general formula of Vi(Me)2SiO-Si(Me)2O-[Si(Rf)(Me)O]m-Si(Me)2Vi, wherein Me represents CH3-, Vi represents CH2=CH-, Rf represents CF3CH2CH2-, and m represents an integer of 18-2000. According to the preparation method, 1-vinyl-3-hydroxy-1,1,3,3-tetramethyldisiloxane is taken as an end-capping agent, and two dimethyl siloxane chains are linked with vinyl, so that the screening effect of trifluoropropyl groups on vinyl at terminals of molecular chains is reduced, the steric-hinerance effect is reduced, the crosslinking activity of vinyl is guaranteed, and the oil resistance of the fluorinated silicone rubber is not damaged.
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Description

technical field

[0001] The invention relates to the field of rubber preparation, in particular to an addition-type liquid fluorosilicone rubber base rubber and a preparation method thereof. Background technique

[0002] Addition-type liquid fluorosilicone rubber has excellent electrical insulation properties, aging resistance, good elasticity, rapid and convenient molding, no by-products in the reaction, and a wide range of operating temperatures. It can be used for packaging or infusion of electronic components and electrical equipment. In particular, it has excellent oil resistance, low volume swelling rate, can produce gaskets, sealing rings, etc. that are in direct contact with fuel, without secondary vulcanization, and has a low compression set rate, which is very suitable for the production of oil resistance for automobiles, etc. part.

[0003] The vulcanization of addition-type liquid fluorosilicone rubber is based on the vinyl group in the molecular chain of the bas...

Examples

Embodiment 1

[0039] An addition-type liquid fluorosilicone rubber base rubber has the following structural formula:

[0040] Vi(Me) 2 SiO-Si(Me) 2 O-[Si(Rf)(Me)O] 35 -Si(Me) 2 O-Si(Me) 2 Vi

[0041] The preparation steps are as follows:

[0042] (1) Add 600g trifluoropropylmethylcyclotrisiloxane (D 3 F), 37.5g 1-vinyl-3-hydroxyl-1,1,3,3-tetramethyldisiloxane (purity 96%) and 0.5g sodium hydroxide silicon alkoxide (NaOH content 4.05%), stirring uniform;

[0043] (2) At room temperature, vacuumize the reactor to -0.04MPa, turn on the heating, raise the temperature to 120-130°C to initiate the reaction of the system and maintain it for 2.5h, maintain the pressure of -0.04MPa to -0.08MPa throughout the reaction, and the water vapor generated by the polymerization, As the reaction proceeds, it is continuously sucked away by negative pressure;

[0044](3) After the reaction is complete, add silicon-based phosphate to neutralize the catalyst and keep it for 0.5h;

[0045] (4) Under the ...

Embodiment 2

[0048] An addition-type liquid fluorosilicone rubber base rubber has the following structural formula:

[0049] Vi(Me) 2 SiO-Si(Me) 2 O-[Si(Rf)(Me)O] 68 -Si(Me) 2 O-Si(Me) 2 Vi

[0050] The preparation steps are as follows:

[0051] (1) Add 600g trifluoropropylmethylcyclotrisiloxane (D 3 F), 20g 1-vinyl-3-hydroxyl-1,1,3,3-tetramethyldisiloxane (purity 96%) and 0.48g sodium hydroxide silicon alkoxide (NaOH content 4.05%), stir well ;

[0052] (2) At room temperature, vacuumize the reactor to -0.04MPa, turn on the heating, raise the temperature to 120-130°C to initiate the reaction of the system and maintain it for 2.5h, maintain the pressure of -0.04MPa to -0.08MPa throughout the reaction, and the water vapor generated by the polymerization, As the reaction proceeds, it is continuously sucked away by negative pressure;

[0053] (3) After the reaction is complete, add silicon-based phosphate to neutralize the catalyst and keep it for 0.5h;

[0054] (4) Under the pressu...

Embodiment 3

[0057] An addition-type liquid fluorosilicone rubber base rubber has the following structural formula:

[0058] Vi(Me) 2 SiO-Si(Me) 2 O-[Si(Rf)(Me)O] 170 -Si(Me) 2 O-Si(Me) 2 Vi

[0059] The preparation steps are as follows:

[0060] (1) Add 600g trifluoropropylmethylcyclotrisiloxane (D 3 F), 9g 1-vinyl-3-hydroxyl-1,1,3,3-tetramethyldisiloxane (purity 96%) and 0.49g sodium hydroxide silicon alkoxide (NaOH content 4.05%), stir well ;

[0061] (2) At room temperature, vacuumize the reactor to -0.04MPa, turn on the heating, raise the temperature to 120-130°C to initiate the reaction of the system and maintain it for 2.5h, maintain the pressure of -0.04MPa to -0.08MPa throughout the reaction, and the water vapor generated by the polymerization, As the reaction proceeds, it is continuously sucked away by negative pressure;

[0062] (3) After the reaction is complete, add silicon-based phosphate to neutralize the catalyst and keep it for 0.5h;

[0063] (4) Under the pressu...