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Dealcoholized organosilicone sealant with low modulus and high elongation percentage and preparation method thereof

A high elongation, low modulus technology, applied in the field of sealants, can solve problems such as poor elastic recovery rate, hidden safety hazards of sealing products, and large permanent deformation of sealants.

Active Publication Date: 2014-12-31
JIANGSU TIANCHEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the modulus of this type of sealant is low in practical applications, the elastic recovery rate is very poor, and the permanent deformation of the sealant is large, which poses a great hidden danger to the safety of the sealed product.

Method used

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  • Dealcoholized organosilicone sealant with low modulus and high elongation percentage and preparation method thereof
  • Dealcoholized organosilicone sealant with low modulus and high elongation percentage and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A dealcoholized low-modulus high-elongation silicone sealant, 100 parts of methyldimethoxy-terminated polydimethylsiloxane, 120 parts of stearic acid-modified nano-calcium carbonate in a vacuum Disperse in the kneader at room temperature for 60 minutes, then raise the temperature to 105-150°C, vacuum dehydrate for 60-120 minutes, and the vacuum degree is 0.06-0.09MPa. After the dispersion is complete, cool to room temperature to obtain the base gum.

[0020] Move the gum base into a high-speed planetary mixer, and sequentially add 15 parts of dimethyl silicone oil, 5 parts of methyltrimethoxysilane, 1.5 parts of β-cyanoethyltrimethoxysilane, 0.5 parts of 2,4-pentanedione, 3 parts of bis(ethyl acetoacetate) bis(isopropoxy) titanate complex, 0.1 part of dibutyltin dilaurate, 2 parts of γ-aminopropyl triethoxysilane, glycidyl ether propyl trimethyl Add 1 part of oxysilane, stir evenly with base glue under vacuum condition, vacuum degree is 0.06-0.09MPa, and the rotation s...

Embodiment 2

[0022] 100 parts of methyldimethoxy-terminated polydimethylsiloxane, 100 parts of stearic acid-treated nano-calcium carbonate were dispersed in a vacuum kneader for 60 minutes at room temperature, then heated to 105-150 °C, and vacuum dehydrated for 60 -120min, the vacuum degree is 0.06-0.09MPa. After the dispersion is complete, cool to room temperature to obtain the base gum.

[0023] Move the base glue into a high-speed planetary mixer, and sequentially add 3 parts of MDT silicone oil, 15 parts of dimethyl silicone oil, 1.5 parts of vinyltrimethoxysilane, 5 parts of methyltrimethoxysilane, β-cyanoethyltrimethoxy 1.5 parts of silane, 0.5 parts of 2,4-pentanedione, 3 parts of bis(ethyl acetoacetate) bis(isopropoxy) titanate complex, 0.1 part of dibutyltin dilaurate, γ-aminopropyl Add 2 parts of triethoxysilane and 1 part of glycidyl ether propyl trimethoxysilane, and stir evenly with the base glue under vacuum conditions, the vacuum degree is 0.06-0.09MPa, and the chemical re...

Embodiment 3

[0025] 100 parts of methyldimethoxy-terminated polydimethylsiloxane, 80 parts of stearic acid-treated nano-calcium carbonate, and 40 parts of silicon micropowder were dispersed in a vacuum kneader for 60 minutes at room temperature, and then heated to 105-150 ℃, vacuum dehydration for 60-120min, and the vacuum degree is 0.06-0.09MPa. After the dispersion is complete, cool to room temperature to obtain the base gum.

[0026] Move the base glue into a high-speed planetary mixer, and sequentially add 3 parts of MDT silicone oil, 18 parts of dimethyl silicone oil, 2 parts of vinyltrimethoxysilane, 4.5 parts of methyltrimethoxysilane, 5 parts of hydrogenated castor oil, 2 parts, 0.5 parts of 4-pentanedione, 3 parts of bis(ethyl acetoacetate) bis(isopropoxy) titanate complex, 0.2 parts of dibutyltin dilaurate, 2 parts of γ-aminopropyl triethoxysilane 1 part, 1 part of glycidyl ether propyl trimethoxysilane is added, and the base gum is stirred evenly under vacuum conditions, the va...

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Abstract

The invention provides a dealcoholized organosilicone sealant with low modulus and high elongation percentage and a preparation method thereof. The organosilicone sealant is prepared from the following raw materials in parts by mass: 100 parts of base polymer, 5-30 parts of plasticizer, 5-150 parts of filler, 1-15 parts of cross-linking agent, 1-5 parts of thixotropic agent, 0.2-3 parts of stabilizer, 0.5-3 parts of catalyst and 0.5-3 parts of coupling agent. During preparation, the raw materials are added into a high-speed dispersion stirrer and are subjected to chemical reaction for 60-180 minutes at the vacuum degree of 0.06-0.095 MPa and at the revolution rate of 20-600 rpm, thereby obtaining the organosilicone sealant. The dealcoholized organosilicone sealant has the advantages of low modulus, high elongation percentage, high elastic recovery ratio, good ageing resistance and good high and low-temperature resistance.

Description

technical field [0001] The invention relates to a sealant, in particular to a dealcoholized silicone sealant with low modulus and high elongation, which belongs to polymer sealing materials. technical background: [0002] Silicone sealant is a neutral curing silicone glue, which has good bonding strength and sealing performance for most materials, and has good high and low temperature resistance performance, and the temperature resistance range is -45°C-250°C. With the vigorous development of the silicone sealant industry, all walks of life can see it, but also put forward higher and higher requirements for it. In some fields, sealants are required to have low modulus and high elongation, and good resistance to temperature and high humidity. Such as sealing car airbag splicing. At present, although the modulus of this type of sealant is low in practical applications, the elastic recovery rate is very poor, and the permanent deformation of the sealant is large, which poses ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/04C09J11/06C09K3/10
Inventor 徐古月陆纪平阚新宇
Owner JIANGSU TIANCHEN NEW MATERIALS