A kind of halogen-free flame-retardant reinforced addition type liquid silicone rubber and preparation method thereof

A technology of liquid silicone rubber and addition molding, which is applied in the field of flame retardancy of organic silicon polymer materials, can solve the problems of deteriorating the processing performance and mechanical properties of the liquid silicone rubber of the addition molding, and achieves good processing performance, little influence, and improved mechanical properties. Effect

Active Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain satisfactory flame retardancy, it is usually necessary to add more than 50wt%, which will seriously deteriorate the processability and mechanical properties of addition-type liquid silicone rubber.

Method used

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  • A kind of halogen-free flame-retardant reinforced addition type liquid silicone rubber and preparation method thereof
  • A kind of halogen-free flame-retardant reinforced addition type liquid silicone rubber and preparation method thereof
  • A kind of halogen-free flame-retardant reinforced addition type liquid silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 6 g of zirconium hydrogen phosphate (ZrP) into 600 g of toluene, ultrasonically disperse for 0.1 h, add hindered amine 1 (the molar ratio of zirconium hydrogen phosphate to hindered amine 1 is 1:2), ultrasonicate for 0.5 h, and stir at 30°C for 3 h , washed, centrifuged, and dried to obtain hindered amine intercalation modified zirconium hydrogen phosphate (M-ZrP), the structural formula of hindered amine 1 is shown below.

[0037]

[0038] By the XRD spectrum of ZrP and M-ZrP ( figure 1 ) shows that the interlayer spacing of HA1 intercalation modified zirconium hydrogen phosphate (M-ZrP) increased from 0.76nm (2θ=11.64°) of ZrP to 1.66nm (2θ=5.26°), indicating that HA1 was successfully inserted into ZrP interlayer. 91g of vinyl silicone oil (viscosity at 25°C of 20000mPa·s, vinyl content of 0.12wt%), 40g of fumed silica (specific surface area of ​​360m 2 / g) mixed in a vacuum kneader, kneaded at 30°C for 2h, heated to a material temperature of 170°C and contin...

Embodiment 2

[0043] Add 6 g of zirconium hydrogen phosphate (ZrP) into 180 g of acetone, ultrasonically disperse for 0.1 h, add hindered amine 2 (the molar ratio of zirconium hydrogen phosphate to hindered amine 2 is 1:2), sonicate for 2 h, and stir at 30°C for 6 h, Washing, centrifugation, and drying obtained hindered amine intercalation modified zirconium hydrogen phosphate (M-ZrP). The structural formula of hindered amine 2 is shown below. XRD results showed that hindered amine 2 was successfully inserted into the interlayer of zirconium hydrogen phosphate.

[0044]

[0045] 91g of vinyl silicone oil (viscosity at 25°C of 20000mPa·s, vinyl content of 0.12wt%), 40g of fumed silica (specific surface area of ​​360m 2 / g) mixed in a vacuum kneader, kneaded at 30°C for 2h, heated to a material temperature of 170°C and continued kneading for 2h, then evacuated and kneaded for 1h, cooled and ground by a three-roll machine to obtain component A.

[0046] Add 4.5g of M-ZrP into 135g of dimeth...

Embodiment 3

[0050] Add 6 g of zirconium hydrogen phosphate (ZrP) into 300 g of ethanol, ultrasonically disperse for 0.1 h, add hindered amine 3 (the molar ratio of zirconium hydrogen phosphate to hindered amine 3 is 1:2), sonicate for 1 h, and stir at 30°C for 6 h, Washing, centrifugation, and drying obtained hindered amine intercalation modified zirconium hydrogen phosphate (M-ZrP). The structural formula of hindered amine 3 is shown below. XRD results showed that hindered amine 3 was successfully intercalated between zirconium hydrogen phosphate layers.

[0051]

[0052] 91g of vinyl silicone oil (viscosity at 25°C of 20000mPa·s, vinyl content of 0.12wt%), 40g of fumed silica (specific surface area of ​​360m 2 / g) mixed in a vacuum kneader, kneaded at 30°C for 2h, heated to a material temperature of 170°C and continued kneading for 2h, then evacuated and kneaded for 1h, cooled and ground by a three-roll machine to obtain component A.

[0053] Add 4.5g of M-ZrP to 450g of carbon tetra...

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Abstract

The invention discloses a halogen-free flame-retardant reinforced addition liquid silicone rubber and a preparation method thereof. The formula of raw materials adopted by the preparation method comprises 100 parts of vinyl silicone oil, 30-60 parts of white carbon black, 1-10 parts of hydrogen-containing silicone oil, 2-10 parts of a flame retardant, 10-40ppm parts of a platinum catalyst and 0.004-0.03 parts of 1-acetenyl-1-cyclohexanol. The flame retardant is hindered amine intercalation modified zirconium hydrogen phosphate. The addition liquid silicone rubber has the advantages of good mechanical performances, excellent flame retardation performance, and no generation of toxic substances or irritant gases in the combustion process, accords with environmental protection requirement, and can be widely used in the fields of spaceflight, aviation, electrons, electric appliances and electric power.

Description

technical field [0001] The invention relates to the flame retardant field of organosilicon polymer materials, in particular to a halogen-free flame retardant reinforced addition type liquid silicone rubber and a preparation method thereof. [0002] technical background [0003] Silicone rubber has excellent properties such as high and low temperature resistance, weather resistance, electrical insulation, chemical corrosion resistance and physiological inertia, and is widely used in various fields of the national economy. Among them, the addition-type liquid silicone rubber has broad application prospects due to its simple process, no by-products produced during the vulcanization process, and low shrinkage. However, addition-type liquid silicone rubber, like ordinary silicone rubber, contains a large amount of C and H in the molecular chain, and will smolder when exposed to open flames, which greatly limits its high flame-retardant requirements in aerospace, electronic applian...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K3/36C08K9/06C08K3/32
Inventor 曾幸荣张亚军赖学军李红强方伟镇陈宛涓谢华理
Owner SOUTH CHINA UNIV OF TECH
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