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Neutral room-temperature-vulcanization silicone sealant

A technology for vulcanizing silicone and sealant, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of inability to disperse hard agglomerated particles, increase manufacturing costs, difficulty in dispersing and depolymerizing, and achieve increased Dissolving properties, improving regularity, and long shelf life

Inactive Publication Date: 2018-11-13
芜湖市颂晖商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main filler of neutral silicone sealants is nano-calcium carbonate. Nano-calcium carbonate with large specific surface area and small particle size has better reinforcement and tensile properties, but when the particle size of nano-calcium carbonate is as small as 40-60nm , the particle BET specific surface area is larger (22~34m 2 / g), the cohesion is enhanced, it is easy to form a tight hard agglomeration, the secondary particle agglomeration is serious, and the dispersion and depolymerization are relatively difficult. The hard agglomerated particles cannot be dispersed during the silicone sealant kneading process, so it can only be passed once or Repeated grinding to disperse it will inevitably increase the manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for modified nano-calcium carbonate, comprising the following steps:

[0031] 1) to saturated Ca(OH) 2 Add chitosan to the slurry, and then put it into the carbonization tower for stirring; the amount of polysaccharide added is saturated Ca(OH) 2 8% by weight of slurry.

[0032] 2) Step 1) treated Ca(OH) 2 The slurry is pumped out and sent to the emulsification disperser, and CO is fed into the emulsification disperser at the same time 2 Gas and Ca(OH) 2 The slurry is mixed and reacted, and the emulsification disperser is emulsified and dispersed, and the mixed slurry is continuously sent back to the carbonization tower to make the Ca(OH) 2 The slurry is continuously circulated between the carbonization tower and the emulsification disperser for carbonization and emulsification dispersion; when the carbonization reaches pH=9, stop CO 2 The introduction of gas and the operation of the emulsification disperser;

[0033] 3) Add acrylic acid emuls...

Embodiment 2

[0037] A preparation method for modified nano-calcium carbonate, comprising the following steps:

[0038] 1) to saturated Ca(OH) 2 Add chitosan in the slurry, then put it into the carbonization tower and carry out stirring process; the addition of chitosan is saturated Ca(OH) 2 10% of the slurry weight.

[0039] 2) Step 1) treated Ca(OH) 2 The slurry is pumped out and sent to the emulsification disperser, and CO is fed into the emulsification disperser at the same time 2 Gas and Ca(OH) 2 The slurry is mixed and reacted, and the emulsification disperser is emulsified and dispersed, and the mixed slurry is continuously sent back to the carbonization tower to make the Ca(OH) 2 The slurry is continuously circulated between the carbonization tower and the emulsification disperser for carbonization and emulsification dispersion; when the carbonization reaches pH=10, stop CO2 The introduction of gas and the operation of the emulsification disperser;

[0040] 3) Add acrylic acid ...

Embodiment 3

[0044] A neutral room temperature vulcanizing silicone sealant, calculated in parts by weight, comprising the following components:

[0045] 50 parts of silane-terminated polydimethylsiloxane, 36 parts of α, ω-dihydroxypolydimethylsiloxane, 85 parts of modified nano-calcium carbonate of Example 1, 8 parts of crosslinking agent, February silicon 3.2 parts of dibutyltin acid and 2.6 parts of γ-(2,3-glycidoxy)propyltrimethoxysilane. The crosslinking agent is a mixture of ethyltris(isoallyloxy)silane and tetrabutanoximinosilane in a mass ratio of 5:1.

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Abstract

The invention provides a neutral room-temperature-vulcanization silicone sealant. The neutral room-temperature-vulcanization silicone sealant comprises, by weight, 40-60 parts of silane-terminated polydimethyl siloxane, 30-40 parts of alpha, omega-dyhydroxyl polydimethyl siloxane, 70-100 parts of modified nano calcium carbonate, 6-12 parts of crosslinking agent, 0.1-5 parts of catalyst and 1-4 parts of coupling agent, wherein the modified nano calcium carbonate is mainly prepared by sequentially subjecting boiled calcium carbonate slurry to modification by a compound surface treatment agent formed by oleic acid and soybean oil and sodium stearate. The sealant is fast in room temperature vulcanization speed, good in aging resistance, heat resistance and water resistance, long in storage life and stable in performance.

Description

technical field [0001] The invention belongs to the technical field of sealing materials, and in particular relates to a neutral room temperature vulcanizing silicone sealant. 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. Exposure to water in the air should cure to form an elastic silicone rubber. Silicone rubber is a polymer elastic material with both inorganic and organic materials in its molecular chain. It has unique comprehensive properties, such as high and low temperature resistance, low compression set, hydrophobicity, weather resistance, and ozone aging resistance. Indispensable material for industry. The heat resistance of silicone rubber in the air is much better than that of organic rubber, and its physical and mechanical properties are basically unchanged at 150°C, and it can be used semi-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/06
CPCC08K2003/265C08K2201/011C08L2201/08C08L2205/025C09J11/04C09J11/06C09J183/04C08L83/04C08K13/06C08K9/04C08K9/08C08K3/26C08K5/5465C08K5/5425
Inventor 汪泽维汪鹏
Owner 芜湖市颂晖商贸有限公司
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