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Dealcoholized organosilicon sealant with damp-heat resistance and stable storage

A storage-stable, dealcoholized technology, applied in the field of dealcoholized silicone sealant and its preparation, can solve the problems of high toxicity of organotin catalysts, poor processability, and difficult to control dosage, and improve storage performance and process performance. , Excellent damp and heat resistance, good damp and heat resistance

Active Publication Date: 2010-07-07
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of these two compositions is that they are poor in storage stability, which leads to gradual degradation of the polymer. If they are stored in containers for a long time, the polymer cannot be cured, and the organotin catalyst is more toxic. It is difficult to control the dosage, if the dosage is small, it will not cure, if the dosage is too large, it will even cure in the sealed tube, the adjustable dosage is small, and the manufacturability is poor
Therefore, the moisture and heat resistance and storage performance of the single-component silicone sealant in the prior art are still not ideal

Method used

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  • Dealcoholized organosilicon sealant with damp-heat resistance and stable storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In terms of parts by weight, 1000g of α, ω-dihydroxy polydimethylsiloxane with a molecular weight of 50,000, 500g of stearic acid-treated nano-calcium carbonate, and 500g of silicon micropowder were vacuum stirred and dehydrated at 100°C for 2 hours as a base. Material use. Take 1000g of the base material, add 30g of methyltrimethoxysilane and 20g of phenyltrimethoxysilane, stir in vacuum for 20 minutes, add 30g of white carbon black and 200g of dimethyl silicone oil with a molecular weight of 500, stir evenly and add 30g of catalyst two (Isopropoxy)bis(ethyl acetoacetate)titanium and 3g of γ-aminopropyltriethoxysilane were stirred in vacuum for 20 minutes, and then discharged and sealed for storage.

[0032] The mechanical properties, heat and humidity resistance and storage stability of the sealant are shown in Tables 1 and 2.

Embodiment 2

[0034] In parts by weight, prepare the base material according to the preparation method of the base material in Example 1, take 1000 g of the base material, add 20 g of methyltrimethoxysilane, 30 g of phenyltrimethoxysilane, stir in vacuum for 20 minutes, then add 30 g of white Carbon black and 200g molecular weight are the simethicone oil of 500, after stirring, add 30g catalyst bis(isopropoxy)bis(ethyl acetoacetate)titanium and 3g gamma-aminopropyltriethoxysilane, vacuum stir 20 Minutes later, the discharge is sealed and preserved.

[0035] The mechanical properties, heat and humidity resistance and storage stability of the sealant are shown in Tables 1 and 2.

Embodiment 3

[0037] In parts by weight, prepare the base material according to the preparation method of the base material in Example 1, take 1000 g of the base material, add 30 g of methyltrimethoxysilane, 20 g of phenyltrimethoxysilane, stir in vacuum for 20 minutes, and then add 30 g of white Carbon black and 200g of simethicone oil with a molecular weight of 500 were stirred evenly, and then 30g of the catalyst organotitanium complex D60 and 3g of γ-aminopropyltriethoxysilane were added, stirred in a vacuum for 20 minutes, and then discharged and sealed for storage.

[0038] The mechanical properties, heat and humidity resistance and storage stability of the sealant are shown in Tables 1 and 2.

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Abstract

The invention provides a dealcoholized organosilicon sealant with damp-heat resistance and stable storage. The dealcoholized organosilicon sealant is characterized in that the organosilicon sealant comprises the following components according to parts by weight: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 1-20 parts of mixed crosslinking agent, 1-20 parts of titanate catalyst, 0-300 parts of filler, 0-200 parts of low molecular weight silicone oil and 0-10 parts of tackifier. The invention further provides a preparation method for the dealcoholized organosilicon sealant, which is characterized in that: as titanate is selected as the catalyst and the mixed crosslinking agent is used, the storing and processing performances are improved; with excellent mechanical property, good damp-heat resistance and high storage stability, the obtained sealant is particularly applicable to adhesive bonding and encapsulating of various electronic and electrical appliances.

Description

technical field [0001] The invention relates to a dealcoholized silicone sealant resistant to heat and humidity and stable in storage and a preparation method thereof, belonging to the technical field of sealants. Background technique [0002] With the rapid development of the electrical and electronic industry, the dealcoholized silicone one-component sealant (RTV-1) has the advantages of neutrality, non-corrosion to the substrate, non-toxicity, strong adaptability and low cost and price. , is favored by industry applications and researchers and has been developed rapidly, but it also has shortcomings such as slow curing speed, poor storage stability, and poor adhesion to substrates, especially in the solar photovoltaic industry. It has good moisture and heat resistance, that is, the performance does not decrease significantly after being placed for 1000 hours at a temperature of 85°C and a humidity of 85% or boiled at 100°C for 24 hours. [0003] Japanese patent JP0317158...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06
Inventor 金小林周鹏戴宏程
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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