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Sealant applied to sealing of underwater optical electronic equipment and preparation method thereof

A technology for electronic equipment and sealant, applied in the direction of adhesives, natural rubber adhesives, polymer adhesive additives, etc., can solve the problems of low volatility, affecting the data transmission of optical and electronic equipment, and not considering the low radioactivity of optical equipment. , to achieve the effects of low cold flow, high rheological resistance, and good air tightness

Active Publication Date: 2019-02-01
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN200910195519.9 discloses a special sealant for condensers. Its formula contains a large amount of mineral fillers such as calcium carbonate and talcum powder. The trace mineral elements contained in these mineral fillers are radioactive, which affects the data transmission of optical and electronic equipment.
CN201711277759.4 invented a mildew-proof sealant, which also uses butyl rubber as the main material, and also does not consider the characteristics of low radioactivity and low volatility required by optical equipment

Method used

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  • Sealant applied to sealing of underwater optical electronic equipment and preparation method thereof
  • Sealant applied to sealing of underwater optical electronic equipment and preparation method thereof
  • Sealant applied to sealing of underwater optical electronic equipment and preparation method thereof

Examples

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Effect test

preparation example Construction

[0028] The preparation method of described sealing strip, its preparation method is:

[0029] (1) Mix butyl rubber, natural rubber, low-radioactive filler, active agent, and coupling agent in an internal mixer to form a masterbatch.

[0030] (2) Heat up the kneader to 100°C-120°C, put the masterbatch into the kneader, add other fillers, and then knead under vacuum for 1h-2h, mix the sealant evenly, and discharge.

[0031] (3) After the sealant is placed for 24 hours, it is extruded into a sheet with a thickness of less than 1mm through an extruder, and the sheets are separated with silicone release paper.

[0032] The low radioactivity filler can be added in step (1) and step (2) respectively, the step (1) adds 50-70% of the total amount, and the remaining part is added in step (2).

Embodiment example 1

[0034] Sealant formulation:

[0035] The mass points of each component in the formula are: 50 parts of butyl rubber, 30 parts of natural rubber, 30 parts of low molecular polyisobutylene, 5 parts of medium molecular polyisobutylene, 10 parts of silicon dioxide, and 5 parts of polymer microspheres , 5 parts of carbon black, 5 parts of zinc oxide, 5 parts of TMTD accelerator, 2 parts of salicylanilide, 0.5 part of glycidoxypropyltrimethoxysilane.

[0036] Mix butyl rubber, natural rubber, low-radioactive filler, active agent, and coupling agent in an internal mixer to form a masterbatch. Raise the temperature of the kneader to 100°C-120°C, put the masterbatch into the kneader, add other fillers, then knead under vacuum for 1h-2h, and discharge the sealant after mixing evenly. After the sealant is placed for 24 hours, it is extruded into a sheet with a thickness of less than 1mm through an extruder, and the sheets are separated by silicone release paper.

[0037] The performanc...

Embodiment example 2

[0041] Sealant formulation:

[0042] The mass points of each component in the formula are: 50 parts of butyl rubber, 10 parts of natural rubber, 10 parts of low molecular polyisobutylene, 15 parts of medium molecular polyisobutylene, 20 parts of silicon dioxide, and 5 parts of polymer microspheres , 20 parts of carbon black, 5 parts of zinc oxide, 5 parts of accelerator BZ, 2 parts of salicylanilide, and 1 part of methyltriethoxysilane.

[0043] Mix butyl rubber, natural rubber, 1 / 2 low-radioactive filler, active agent, and silane coupling agent in an internal mixer to form a masterbatch. Heat the kneader to 100°C~120°C, put the masterbatch into the kneader, add 1 / 2 of the low-radioactive filler and other fillers, then knead under vacuum for 1h~2h, after the sealant is mixed evenly, discharge . After the sealant is placed for 24 hours, it is extruded into a sheet with a thickness of less than 1mm through an extruder, and the sheets are separated by silicone release paper.

...

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Abstract

The invention relates to a sealant applied to sealing of underwater optical electronic equipment and a preparation method thereof, and belongs to the field of sealing materials. A base material of thesealant comprises high-molecular butyl rubber and natural rubber which are combinedly used, and a low radioactive filler, low-molecular polyisobutylene, middle-molecular polyisobutylene, an activator, a mildew inhibitor and a coupling agent are added. With combined use of butyl rubber and natural rubber, not only are the characteristics of good air tightness and water tightness of butyl rubber retained, but also the shortcomings of poor processability, poor vulcanization property and cold flow of butyl rubber are overcome, so that the sealant has the advantages of good air tightness, water tightness, low cold flow property and high strength. The low-molecular polyisobutylene and middle-molecular polyisobutylene as a tackifier and a viscosity regulator have good compatibility with butyl rubber, have no small molecular migration or volatilization, have good adhesion with optical glass, metal materials and non-metallic materials, and at the same time, make a sealing strip have pressure sensitivity and be easy to construct.

Description

technical field [0001] The invention relates to a sealant used for sealing underwater optical and electronic equipment and a preparation method thereof, belonging to the field of sealing materials. Background technique [0002] The sealing of underwater optical and electronic equipment and its cables requires good water resistance, low radioactivity, no small molecule volatiles and long-term resistance to water immersion. Butyl rubber is one of the materials with the best airtightness and watertightness in rubber. There are many reports on the preparation of airtight materials with butyl rubber as the main material, but none of them consider the low radioactive requirements required for its application in optical instruments. And there is no requirement for small molecule volatiles, so mineral fillers, small molecule plasticizers are used in the formulation design, or small molecule materials are generated through chemical reactions in the formulation. For example, CN200910...

Claims

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Application Information

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IPC IPC(8): C09J123/22C09J107/00C09J11/04C09J11/06C09J11/08
CPCC08K2003/2296C08L2205/025C08L2205/035C09J11/04C09J11/06C09J11/08C09J123/22C08L7/00C08L23/22C08L25/06C08L33/02C08L33/20C08K3/36C08K3/04C08K3/22C08K5/20
Inventor 蔺艳琴郑长红冯志力汤怀国
Owner BAIMTEC MATERIAL CO LTD
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