Silicone sealant for rail transit and preparation method thereof

A silicone sealant, base glue technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc. question

Inactive Publication Date: 2020-10-20
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The base of silicone sealant is generally hydroxyl-terminated polydimethylsiloxane, and during storage, the free alcohol or a small amount of water in the base will react with the cross-linkable polysiloxane under the action of a catalyst. Equ...

Method used

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  • Silicone sealant for rail transit and preparation method thereof
  • Silicone sealant for rail transit and preparation method thereof
  • Silicone sealant for rail transit and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A high-performance traffic silicone sealant in this example is prepared by the following method:

[0071] (1) Add 100 parts of 80000cps α,ω-dihydroxypolydimethylsiloxane, 120 parts of activated calcium carbonate and 100 parts of 350cps simethicone into the kneader, set the material temperature to 120°C, vacuum The temperature is controlled at -0.09Mpa~-0.1Mpa, kneaded for 3~5 hours to dehydrate, and cooled to room temperature for later use.

[0072] (2) Base material after dehydration and cooling in step (1), 10 parts of phenyl tributylketoxime silane, 2 parts of vinyl tributylketoxime silane, 3 parts of γ-aminopropyltriethoxysilane, Add 1 part of polysilazane 1500RC and 0.25 parts of dibutyltin dilaurate to the planetary machine and stir for reaction. During this period, keep the vacuum degree not lower than -0.09MPa, rotate at 10-800rpm, and stir for 120min.

Embodiment 2

[0074] A high-performance traffic silicone sealant in this example is prepared by the following method:

[0075] (1) Add 100 parts of 20000cps α,ω-dihydroxy polydimethylsiloxane, 150 parts of activated calcium carbonate and 80 parts of 350cps simethicone into the kneader, set the material temperature to 120°C, vacuum The temperature is controlled at -0.09Mpa~-0.1Mpa, kneaded for 3~5 hours to dehydrate, and cooled to room temperature for later use.

[0076] (2) The base material after dehydration and cooling, 8 parts of methyl tributylketoxime silane, 4 parts of vinyl tributylketoxime silane, 2.5 parts of γ-aminopropyltriethoxysilane, 1.5 parts of polysilicon Azane 1500RC and 0.25 parts of dibutyltin dilaurate are sequentially added to the planetary machine and stirred for reaction, during which the vacuum degree is kept not lower than -0.09MPa, the rotation speed is 10-800rpm, and the mixture is stirred for 120min.

Embodiment 3

[0078] A high-performance traffic silicone sealant in this example is prepared by the following method:

[0079] (1) Mix 50 parts of 80000cps α, ω-dihydroxypolydimethylsiloxane, 50 parts of 20000cps α, ω-dihydroxypolydimethylsiloxane, 120 parts of activated calcium carbonate and 80 parts of 350cps dimethicone Add methyl silicone oil into the kneader, set the temperature of the material to 130°C, control the vacuum degree at -0.09Mpa to -0.1Mpa, knead for 3 hours to dehydrate, cool to room temperature and set aside.

[0080] (2) The base material after dehydration and cooling, 8 parts of phenyl tributylketoxime silane, 4 parts of vinyl tributyl ketoxime silane, 3 parts of N-β aminoethyl γ-aminopropyl trimethoxysilane , 2 parts of polysilazane 1500RC and 0.25 parts of dibutyltin diacetate were sequentially added to the planetary machine and stirred for reaction, during which the vacuum degree was kept not lower than -0.09MPa, the rotation speed was 10-800rpm, and the mixture was...

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Abstract

The invention relates to a silicone sealant for rail transit and a preparation method thereof. The silicone sealant is prepared from the following raw materials in parts by weight: 100 parts of base rubber, 50-120 parts of dimethyl silicone oil, 50-180 parts of calcium carbonate, 5-15 parts of a cross-linking agent, 1-5 parts of a silane coupling agent, 0.5-5 parts of polysilazane and 0.05-1 partof a catalyst, wherein the base rubber is alpha,omega-dihydroxy polydimethylsiloxane. According to the silicone sealant, the bulging phenomenon under the condition of large day and night temperature difference is improved, deep curing is accelerated, mechanical properties are obviously improved, and a storage period is greatly prolonged.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a silicone sealant for rail transit and a preparation method thereof. Background technique [0002] Traffic sealant is widely used as a kind of caulking glue in the bonding of highways, airport runways, intercity trains and subway tracks. When heavy vehicles such as airplanes, trains and high-speed rails are running fast, the caulking between the two plates of the runway or track bears a very large migration force. At this time, the caulking adhesive is required to have excellent tensile strength and displacement capacity. The glue also needs to have excellent wear resistance and weather resistance. [0003] Currently commonly used caulks include polyurethane caulks and silicone caulks, both of which have successful application cases. For example, silicone caulk has been applied in Guiguang high-speed railway, Changjiang-Jiangxi high-speed railway, Wuhan intercity railway, etc....

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J183/16C09J11/04C09J11/06
CPCC08K2003/265C08L2205/025C08L2205/03C09J11/04C09J11/06C09J183/04C08L83/04C08L83/16C08K13/02C08K3/26C08K5/544C08K5/5465
Inventor 罗元章付子恩戴飞亮周波雄林树忠蒋金博黄恒超缪明松
Owner GUANGZHOU BAIYUN CHEM IND
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