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Flame retardant rubber and preparation method thereof

A technology of flame retardant rubber and flame retardant, which is applied in the field of flame retardant EPDM rubber and its preparation, and can solve problems such as low mechanical properties of materials

Active Publication Date: 2013-05-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of low mechanical properties of the prepared material when an effective amount of hydroxide flame retardant is added when preparing flame retardant rubber in the prior art, the present invention provides a flame retardant rubber and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The invention also discloses a preparation method of the above-mentioned flame-retardant rubber, comprising mixing a mixture containing EPDM raw rubber, modified polybutadiene, vulcanizing agent, and hydroxide flame retardant at 30-150°C for 2 -40 minutes to obtain the mixed rubber; then vulcanize the mixed rubber at 150-220° C. for 2-30 minutes to obtain the flame-retardant rubber.

[0029] The method of above-mentioned mixing is method known in the art, as in internal mixer (Dalian Bingshan Rubber & Plastic Machinery Co., Ltd.), adjust the rotor speed to be 30-50rpm, and the top bolt pressure is 4-7MPa, mix, then Raise the temperature to 80°C and stop the warehouse to discharge the material to obtain the mixed rubber.

[0030] After the above-mentioned rubber mixture is obtained, the rubber mixture is usually left to stand for 8-48 hours, or the above-mentioned rubber mixture is placed in an oven and kept at 80-100° C. for 40-70 minutes. The above-mentioned treatment...

Embodiment 1

[0036] This example is used to illustrate the flame-retardant rubber disclosed in the present invention and its preparation method.

[0037] Based on the weight of EPDM raw rubber, 100 parts by weight of EPDM raw rubber [Keltan series, produced by Dutch DSM company, ethylene content is 40wt%, Mooney viscosity (125 ° C 1+4) is 50], 3 parts by weight of sulfur, 52 parts by weight of isocyanate-terminated polybutadiene (Sartomer Specialty Chemicals, the content of isocyanate groups is 15wt%, the viscosity at 25°C is 17000cps, and the number average molecular weight is 16000), 80 parts by weight Magnesium hydroxide (average particle size is 150um) is added to the internal mixer (Dalian Bingshan Rubber & Plastic Machinery Co., Ltd.), the rotor speed is adjusted to 30rpm, the pressure of the top bolt is 5MPa, and the mixing time is 20min at 60°C, and then the temperature is raised Stop the warehouse at 80°C and discharge to obtain rubber compound A1.

[0038] The mixed rubber A1 wa...

Embodiment 2

[0040] This example is used to illustrate the flame-retardant rubber disclosed in the present invention and its preparation method.

[0041] Based on the weight of EPDM raw rubber, 100 parts by weight of EPDM raw rubber [Keltan series, produced by Dutch DSM company, ethylene content is 50wt%, Mooney viscosity (125 ° C 1+4) is 40], 5 parts by weight of 2,4,6-trimercapto-s-triazine, 20 parts by weight of maleated polybutadiene (Sartomer Specialty Chemicals Company, the content of maleic acid group is 5wt%, the viscosity at 25°C 5000cps, the number average molecular weight is 3000), 100 parts by weight of aluminum hydroxide (average particle diameter is 50um) joins in the internal mixer (Dalian Bingshan Rubber & Plastic Machinery Co., Ltd.), adjusts the rotor speed to be 40rpm, and the pressure of the top bolt is 6MPa, kneading at 80°C for 10min, then stop the warehouse at 80°C and discharge to obtain the mixed rubber A2.

[0042] Put the compound rubber A2 in a 50T plate vulcan...

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Abstract

The invention provides flame retardant rubber and a preparation method thereof. The flame retardant rubber is obtained by milling and vulcanizing a mixture containing ethylene-propylene-diene monomer raw rubber, modified polybutadiene, a vulcanizing agent and a hydroxide flame retardant. The modified polybutadiene is isocyanate terminated polybutadiene and / or maleated polybutadiene. The flame retardant rubber has good flame retardant property and excellent mechanical performance.

Description

technical field [0001] The invention relates to a flame-retardant rubber and a preparation method thereof, in particular to a flame-retardant EPDM rubber and a preparation method thereof. Background technique [0002] EPDM rubber is obtained by polymerizing three monomers of ethylene, propylene and diene in the presence of a catalyst. The diene as the third monomer mainly includes ethylidene norbornene, dicyclopentadiene and 1 , 4-hexadiene, etc. EPDM rubber has good chemical stability, and its ozone resistance, aging resistance, chemical resistance, weather resistance and heat resistance are all excellent. Its main production method is solution or suspension polymerization via Ziegler-Natta catalysts. Mainly used in high-grade cable materials, automotive parts, especially as automotive sealing strips, windproof and rainproof tapes, waterproof building materials, radiator hoses, shock absorbers and tire side tires, etc. In addition, EPDM rubber is also widely used in elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16
Inventor 林志文
Owner BYD CO LTD
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