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Anti-tracking agent for addition-type liquid silicone rubber and its preparation method and application

A technology of liquid silicone rubber and tracking resistance, applied in the application of addition type liquid silicone rubber, and the field of tracking resistance tracking agent for addition type liquid silicone rubber, which can solve the problem of restricting the development of tracking resistance agent and deteriorating the addition type. Liquid silicone rubber processing performance and mechanical properties, complex process and other problems, to improve the tracking resistance performance, easy to achieve industrial production, the effect of simple preparation process

Active Publication Date: 2016-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 5,942,571 discloses a compounding of zinc oxide, zinc borate or magnesium hydroxide and aluminum hydroxide as an anti-tracking agent, which can effectively improve the anti-tracking performance of addition-type liquid silicone rubber, but there is an excessive amount of addition , poor processing performance and other shortcomings
U.S. Patent No. 5,973,030 reports a zinc carbonate and aluminum hydroxide that are surface-treated with silane coupling agents, silazane or siloxane oligomers as fillers, and add a small amount of benzotriazole. Liquid silicone rubber has good tracking resistance and flame retardancy, but it also has the disadvantages of excessive addition and complicated process.
Chinese patent CN1730561A also reported a kind of polydiorganosiloxane and reinforcing filler as the main components of liquid silicone rubber material, plus silicone resin and other fillers, the prepared liquid silicone rubber material has high tensile strength, It has the advantages of high elongation and high tear strength, but most of the tracking resistance can only reach 1A3.5 level
In addition, U.S. Patent US5994461 reports a silicone resin with high vinyl content to partially replace vinyl silicone oil, and the obtained addition-type liquid silicone rubber has good tracking resistance without adding any tracking resistance agent. However, due to the high crosslinking density of the system, the hardness of the material is too high and the elongation at break is low
[0005] At present, although some progress has been made in improving the tracking resistance of addition-type liquid silicone rubber, there is a great weakness in addition-type liquid silicone rubber, that is, organic compounds containing N, P, S and other elements, Sn-containing , Pb, Hg, Bi, As and other heavy metal ionic compounds or alkyne-containing unsaturated organic compounds, the platinum catalyst used is easily poisoned and the silicone rubber cannot be vulcanized (research progress on platinum catalysts in the organosilicon industry. Aerospace materials technology ,1999(3):19), which greatly limits the development of anti-tracking agents for addition-type liquid silicone rubber
However, the existing anti-tracking agents have the disadvantages of large addition amount (generally greater than 40wt%) and poor compatibility with silicone rubber, which seriously deteriorates the processability and mechanical properties of addition-type liquid silicone rubber.

Method used

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  • Anti-tracking agent for addition-type liquid silicone rubber and its preparation method and application
  • Anti-tracking agent for addition-type liquid silicone rubber and its preparation method and application
  • Anti-tracking agent for addition-type liquid silicone rubber and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Add 5.81g propenyl alcohol, 0.20g tetrabutyl titanate and 50mL toluene into a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring, thermometer and constant pressure dropping funnel, then slowly add 34.84g3- (Diisopropylureido)propyltriethoxysilane (DIPUPES), heat up to 80°C, react for 2h, continue to react for 1h at a vacuum of 0.01kPa, and distill under reduced pressure for half an hour to remove low boilers to obtain the product leakage resistance Tracking agent1.

[0038] Infrared spectra of DIPUPES and anti-tracking agent 1 ( figure 1 )As can be seen, figure 1 a with figure 1 b all appear 3365cm -1 N-H stretching vibration peak at 1628cm -1 at C=O stretching vibration peak and 1525cm -1 at the C-N stretching vibration peak; figure 1 b with figure 1 a compared at 958cm -1 and 1167cm -1 Si-OCH 2 CH 3 The characteristic absorption peak has been significantly weakened, at 922cm -1 New appearance at -CH=CH 2 The C-H absorption peak ...

Embodiment 2

[0045] Add 20.33g of propenol, 0.47g of tetrabutyl titanate and 50mL of toluene into a 250mL four-necked flask equipped with a reflux condenser, mechanical stirring, thermometer and constant pressure dropping funnel, then slowly add 26.44g of 3- Ureidopropyltriethoxysilane (UPES), heated to 70°C, reacted for 4 hours, continued to react for 1 hour under vacuum of 0.01kPa, and removed low boilers by distillation under reduced pressure for half an hour to obtain the product anti-tracking agent 2.

[0046] From the infrared spectrum of anti-tracking agent 2 ( image 3 ) can be seen, 3348cm -1 N-H stretching vibration peak appeared at 1653cm -1 C=O stretching vibration peak appeared at 1560cm -1 C-N stretching vibration peak appears at 922cm -1 The C-H absorption peak in vinyl appears at . From the hydrogen nuclear magnetic resonance spectrum of anti-tracking agent 2 ( Figure 4 ) It can be seen that the absorption peaks of the proton hydrogen in the vinyl group appear at the ...

Embodiment 3

[0050] Add 5.81g propenyl alcohol, 0.18g tetrabutyl titanate and 50mL toluene into a 250mL four-neck flask equipped with a reflux condenser, mechanical stirring, thermometer and constant pressure dropping funnel, then slowly add 30.64g3- (Isopropylureido)propyltriethoxysilane (IPUPES), heat up to 60°C, react for 6h, continue to react for 4h at a vacuum of 25kPa, remove low boilers by distillation under reduced pressure for half an hour to obtain a product that is resistant to tracking Agent 3.

[0051] From the infrared spectrum of anti-tracking agent 3 ( Figure 5 ) can be seen, 3340cm -1 The N-H stretching vibration peak appeared at 1633cm -1 C=O stretching vibration peak appeared at 1558cm -1 C-N stretching vibration peak appears at 958cm -1 and 1167cm -1 Si-OCH 2 CH 3 Characteristic absorption peak at 922cm -1 The C-H absorption peak in vinyl appears at . From the hydrogen nuclear magnetic resonance spectrum of anti-tracking agent 3 ( Image 6 ) It can be seen th...

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Abstract

The invention discloses a creepage-resistant tracking agent for addition-type liquid silicon rubber and a preparation method and application thereof. The creepage-resistant tracking agent is a silane compound containing alkenyl and ureido. The preparation method comprises the steps of dissolving a hydroxyl alkenyl compound and a ureido-containing silane compound in an organic solvent, adding an organic titanate catalyst, reacting for 2-6h while stirring at the temperature of 60-80 DEG C, continuing to react for 1-4h at the degree of vacuum of 0.01-30kPa, and finally, carrying out reduced-pressure distillation to remove low-boiling-point substances, thereby obtaining the creepage-resistant tracking agent. According to the creepage-resistant tracking agent, the preparation process is simple and convenient, and the raw materials are cheap and are easily obtained, so that the industrial production is easy to realize; the prepared creepage-resistant tracking agent is small in added amount, can remarkably improve the creepage tracking resistance and mechanical properties of the addition-type liquid silicon rubber, and has broad application prospects in the fields of electrical external insulating materials and the like.

Description

technical field [0001] The invention relates to the technical field of rubber insulating materials used for high-voltage insulators, bushings and power cable accessories, in particular to an addition-type liquid silicone rubber anti-tracking agent. The invention also relates to a preparation method of the anti-tracking agent and its application in addition-type liquid silicone rubber. Background technique [0002] In the construction of the power grid, in order to ensure the safe transmission of electric energy, a large number of power equipment such as power transmission transformers, transformers and insulators are used. In recent years, with the intensification of air pollution and the frequent occurrence of smog and haze, the voltage level of power transmission and transformation equipment is increasing day by day, which makes the operating conditions of the external insulation of power equipment continue to deteriorate, which affects the electrical performance of the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K13/02C08K5/5475C08K3/36C07F7/18
Inventor 曾幸荣方伟镇赖学军李红强陈宛涓张利萍杨思广
Owner SOUTH CHINA UNIV OF TECH
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