Low-modulus monocomponent de-ketoxime type room temperature sulfurized silicone sealant and preparation method thereof

A vulcanized silicone, one-component technology, used in adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problem of difficult control of the reaction process, low crosslinking density, and reduced elongation at break and other problems, to achieve the effect of increasing thermal stability and oxidation resistance, good heat and oil resistance, and improving elongation at break

Inactive Publication Date: 2017-06-13
GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the engine is working, it will vibrate and emit a lot of heat, which will easily cause the engine to leak oil and pose a safety hazard. Therefore, it is necessary to use a sealant with high bonding strength, high elongation at break, and excellent oil resistance.
Cohesive strength and oil resistance can often be achieved by increasing crosslink density, but at the expense of lower elongation at break
The elongation at break can usually be improved by adding chain extenders to prepare low modulus silicone sealants, but it will lead to low crosslink density, poor oil resistance, difficult to control the reaction process, and long surface dry time
In addition, low modulus can also be partially achieved by adding plasticizers, but since the amount of plasticizer added is usually large, plasticizer migration is prone to occur, which will eventually reduce the strength of the adhesive

Method used

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  • Low-modulus monocomponent de-ketoxime type room temperature sulfurized silicone sealant and preparation method thereof

Examples

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Effect test

preparation example Construction

[0057] The preparation method of the above-mentioned low modulus one-component deketoxime type room temperature vulcanized silicone rubber comprises the following steps:

[0058]1) Mix hydroxy-terminated polydimethylsiloxane, plasticizer, white mineral oil, fumed silica, reinforcing filler, aluminum stearate and pigment evenly, and dry at 110-130°C for 2-5 hours, get the premix;

[0059] 2) Knead and stir the premixed material at 110-130°C and a vacuum degree of 0.09MPa-0.1MPa for 2-5 hours, then cool to room temperature to obtain the base rubber;

[0060] 3) Add cross-linking agent, vulcanization accelerator and silane coupling agent to the base rubber, and stir for 20-40 minutes under the condition of vacuum degree of 0.09MPa-0.1MPa;

[0061] 4) Add the catalyst to the rubber base, stir for 20-40min under the condition of vacuum degree of 0.09MPa-0.1MPa, discharge, fill and seal.

Embodiment 1

[0064] A low-modulus one-component deketoxime type room temperature vulcanizing silicone sealant, comprising the following raw materials in parts by mass:

[0065] Hydroxyl-terminated polydimethylsiloxane (viscosity 50000mPa·s): 100 parts;

[0066] Simethicone oil (viscosity 1000mPa s): 20 parts;

[0067] White mineral oil (26#): 2.5 parts;

[0068] Hydrophobic fumed silica surface-modified by dimethyldichlorosilane (specific surface area 130m 2 / g): 5 parts;

[0069] Nano-calcium carbonate modified by fatty acid surface: 90 parts;

[0070] Aluminum stearate: 2.5 parts;

[0071] Aluminum powder: 2.5 parts;

[0072] Methyl tributylketoxime silane: 12 parts;

[0073] Alkoxybutanone oximinosilane: 3 parts;

[0074] N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane: 2 parts;

[0075] Stannous octoate: 0.5 parts.

[0076] The preparation method of the above-mentioned low-modulus single-component deketoxime type room temperature vulcanizing silicone sealant is as follows:

[...

Embodiment 2

[0082] A low-modulus one-component deketoxime type room temperature vulcanizing silicone sealant, comprising the following raw materials in parts by mass:

[0083] Hydroxyl-terminated polydimethylsiloxane (viscosity 10000mPa·s): 100 parts;

[0084] Dimethicone oil (viscosity 1000mPa s): 30 parts;

[0085] White mineral oil (26#): 2 parts;

[0086] Hydrophobic fumed silica surface-modified by dimethyldichlorosilane (specific surface area 130m 2 / g): 7 parts;

[0087] Nano-calcium carbonate modified by fatty acid surface: 105 parts;

[0088] Aluminum stearate: 3 parts;

[0089] Aluminum powder: 3 parts;

[0090] Methyl tributylketoxime silane: 8 parts;

[0091] Alkoxybutanone oximinosilane: 2 parts;

[0092] γ-Aminopropyltriethoxysilane: 1 part;

[0093] Dibutyltin dilaurate: 0.3 parts.

[0094] The preparation method of the above-mentioned low-modulus single-component deketoxime type room temperature vulcanizing silicone sealant is as follows:

[0095] 1) The hydroxyl...

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Abstract

The invention discloses a low-modulus monocomponent de-ketoxime type room temperature sulfurized silicone sealant and a preparation method thereof. The silicon sealant is prepared from hydroxyl end-blocked dimethylsiloxane, a plasticizer, white mineral oil, gas phase method silica aerogel, a reinforcing filler, aluminum stearate, pigment, a crosslinking agent, a vulcanization accelerator, a silane coupling agent and a catalyst. The preparation method comprises the following steps: 1) uniformly mixing the hydroxyl end-blocked dimethylsiloxane, the plasticizer, the white mineral oil, the gas phase method silica aerogel, the reinforcing filler, the aluminum stearate and the pigment, and drying the mixture fully to obtain a premix compound; 2) performing vacuum full kneading on the premix compound to obtain base; 3) adding the crosslinking agent, the vulcanization accelerator and the silane coupling agent into the base, performing vacuum stirring uniformly;4) adding the catalyst into the base, performing vacuum stirring uniformly, discharging the mixture, and performing filling and sealing. The low-modulus monocomponent de-ketoxime type room temperature sulfurized silicone sealant provided by the invention has the advantages of neutral solidification, strong bonding power, excellent mechanical property, and good heat resistance and oil resistance.

Description

technical field [0001] The invention relates to a low-modulus single-component deketoxime type room temperature vulcanized silicone sealant and a preparation method thereof, belonging to the technical field of elastomer silicone rubber seals. Background technique [0002] Silicone sealant is a paste made of polydimethylsiloxane as the main raw material, supplemented with crosslinking agent, filler, plasticizer, coupling agent, and catalyst in a vacuum state. Reacts with water in the air and cures to form elastic silicone rubber. It has the advantages of resistance to ultraviolet light and atmospheric aging, heat resistance, low temperature resistance, moisture resistance, etc., and also has excellent chemical stability and electrical insulation properties. Regardless of the cold winter and hot summer, it can still maintain good elasticity in a wide temperature range (-60 ° C ~ 200 ° C), and has excellent adhesion to most substrates. Due to its excellent comprehensive perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08
CPCC08K2201/011C08L2201/08C08L2205/02C08L2205/03C09J11/04C09J11/06C09J11/08C09J183/06C08L83/04C08L91/06C08K13/06C08K9/06C08K3/36C08K5/098C08K9/04C08K2003/265C08K2003/0812C08K5/5465
Inventor 栾安博周诗灿麦裕良邱美坚
Owner GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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