Low-temperature ceramic silicone rubber and preparation method thereof

A technology of low-temperature ceramics and silicone rubber, which is applied in the field of fire-resistant and flame-retardant silicone rubber. It can solve the problems of low porcelain strength and loose ceramic body structure, and achieve the effect of enhanced thermal conductivity and thermal conductivity.

Active Publication Date: 2017-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature ceramized silicone rubber and a preparation method thereof, aiming at the problems that the ceramic body structure is loose and the ceramization strength is not high when the ceramization temperature of the silicone rubber is low in the prior art. The melting temperature is only 700-750°C, while the three-point bending strength of the ceramic body can reach more than 3MPa. The vitrification strength of the ceramic body formed at 700-750°C in the present invention is obviously higher than that of the prior art at 800°C. Porcelain Strength

Method used

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  • Low-temperature ceramic silicone rubber and preparation method thereof
  • Low-temperature ceramic silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In terms of mass percentage, the distribution ratio of each raw material component of a low-temperature ceramizable silicone rubber is:

[0036] Methyl vinyl silicone rubber 80%

[0037] Fumed silica 5%

[0038] Halloysite 5%

[0039] Glass powder 5%

[0040] Boron Nitride 3%

[0041] Hydroxy silicone oil 1%

[0042] DBPMH1%

[0043]When preparing, first mix boron nitride and glass powder with a softening point of 350°C for 10 minutes, then sinter in a muffle furnace at 350°C for 60 minutes, cool with the furnace, and grind the mixture for 10 minutes with a three-roll mill to prepare a Composite flux with thermal conductivity;

[0044] Then add silicone rubber, fumed silica, hydroxy silicone oil, halloysite, and compound flux into the rubber mixer, and banbury at 50°C for 30 minutes, then add the vulcanizing agent DBPMH, and mix for 3 minutes to obtain a compound Rubber, parked for 12 hours, and re-milled on the rubber mill for 3 minutes;

[0045] Vulcanize the ...

Embodiment 2

[0048] In terms of mass percentage, the distribution ratio of each raw material component of a low-temperature ceramizable silicone rubber is:

[0049] Methyl vinyl silicone rubber 40%

[0050] Fumed silica 18%

[0051] Halloysite 30%

[0052] Glass powder 5%

[0053] Boron Nitride 5%

[0054] Hydroxy silicone oil 1%

[0055] DBPMH 1%

[0056] Boron nitride and glass powder with a softening point of 650°C were mixed and stirred for 10 minutes, then sintered in a muffle furnace at 650°C for 30 minutes, cooled with the furnace, and the mixture was ground for 20 minutes with a three-roller mill to prepare a thermally conductive Composite flux;

[0057] Add silicone rubber, fumed silica, hydroxy silicone oil, halloysite, and compound flux into the rubber mixer, banbury at 80°C for 5 minutes, then add vulcanizing agent DBPMH, and mix for 3 minutes to obtain a rubber compound , parked for 12 hours, and returned to the rubber mill for 5 minutes;

[0058] Vulcanize the mixed r...

Embodiment 3

[0061] In terms of mass percentage, the distribution ratio of each raw material component of a low-temperature ceramizable silicone rubber is:

[0062] Methyl vinyl silicone rubber 60%

[0063] Fumed silica 10%

[0064] Halloysite 10%

[0065] Low softening point glass powder 10%

[0066] Boron Nitride 8%

[0067] Hydroxy silicone oil 1%

[0068] DBPMH 1%

[0069] First, boron nitride and glass powder with a softening point of 650°C were mixed and stirred for 30 minutes, then sintered in a muffle furnace at 650°C for 30 minutes, cooled with the furnace, and the mixture was ground for 20 minutes with a three-roll mill to prepare a thermally conductive Composite flux;

[0070] Add silicone rubber, fumed silica, hydroxy silicone oil, halloysite, and compound flux into a rubber mixer, banbury at 50°C for 20 minutes, then add vulcanizing agent DBPMH, and mix for 5 minutes to obtain a rubber compound , parked for 12 hours, and returned to the rubber mill for 3 minutes;

[00...

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Abstract

The invention discloses low-temperature ceramic silicone rubber and a preparation method thereof. The low-temperature ceramic silicone rubber comprises the following raw materials by mass percent: 40-80% of silicone rubber, 10-30% of fumed silica, 15-30% of halloysite, 3-8% of a heat conducting filler, 3-10% of a flux, 1-5% of hydroxyl silicone oil and 1-3% of a vulcanizing agent. During preparation, raw materials are uniformly mixed in a rubber internal mixer or a rubber open mixer to obtain a rubber compound, the rubber compound is vulcanized at the temperature of 150-180 DEG C to obtain ceramic silicone rubber vulcanized rubber, the first-stage vulcanization time is 5-15 min and the second-stage vulcanization time is 2-4 h. The technical method is simple, the prepared ceramic silicone rubber vulcanized rubber has favorable mechanical performance and can be converted into a hard ceramic body at a low ceramization temperature, the ceramic body has the three-point bending strength exceeding 3 MPa and is quick in forming, and wires and cables have more remarkable flame-retardant and fire-retardant effects.

Description

technical field [0001] The invention relates to the technical field of fireproofing and flame retardant of silicone rubber, in particular to a low-temperature ceramized silicone rubber and a preparation method thereof. Background technique [0002] Ceramic silicone rubber is a new type of fire-resistant and flame-retardant material. It has the elasticity and electrical insulation of ordinary silicone rubber at room temperature, but it can be transformed into a hard ceramic body under open flame or high temperature conditions. At present, ceramic silicone rubber is mainly used as a fireproof material in the wire and cable industry. When a fire occurs, ceramic silicone rubber can keep the internal copper wire of the wire and cable from melting within 30 minutes, so that the circuit remains unblocked in the fire. [0003] At present, there have been many research reports on ceramic silicone rubber at home and abroad. For example, Bieliński [Bieliński DM, Anyszka R, M, et al....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K13/02C08K3/36C08K3/40C08K3/38C08K3/28C08K3/34B29C35/02
Inventor 郭建华陈旭明蒋兴华曾幸荣
Owner SOUTH CHINA UNIV OF TECH
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