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One-component high temperature-resistant gasket-free sealant and preparation method thereof

A high-temperature-resistant, single-component technology, applied in chemical instruments and methods, adhesives, and other chemical processes, can solve the problems of fast aging of glue, limited heat resistance of sealants, and affecting sealing effects, etc., to improve curing Speed ​​and bonding strength, heat resistance improvement, corrosion reduction effect

Active Publication Date: 2011-06-15
GLEIHOW NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary gasket-free sealants have limited heat resistance, and at high temperatures above 200°C, there will be problems such as decreased elasticity and aging of the glue, which will affect the sealing effect
Chinese patent CN 101250391A titled "Single-component high-temperature-resistant silicone sealant" introduces phenyl groups into the main chain of hydroxyl-terminated polysiloxane and adds heat-resistant fillers, so that the sealant can be used for a long time at a high temperature of 260°C. However, the elastic properties of the above-mentioned sealants are limited by environmental factors. At 300°C, the aging speed of the glue is fast, and it is not easy to use for a long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] One-component high-temperature resistant gasket-free sealant, by weight ratio, includes the following components:

[0036] α, ω-dihydroxy polysiloxane 100 kg

[0037] α, ω-Dihydroxypolydiphenylsiloxane 100 kg

[0038] Tetrabutanoximinosilane 40 kg

[0039] Fumed silica 100kg

[0040] Iron Oxide 50kg

[0041] Aluminum nitride 50 kg

[0042] MTD silicone oil 5kg

[0043] Titanium dioxide 2.4 kg

[0044] γ-Aminopropyltriethoxysilane 2 kg

[0045] Preparation:

[0046] 100 kg of α, ω-dihydroxypolysiloxane (viscosity of 80000 mPas at 25 °C), 100 kg of α, ω-dihydroxy polydiphenylsiloxane (viscosity of 30000 mPas at 25 °C), fumed silica (Specific surface area 200 cubic meters per gram) 100 kg, 50 kg of iron oxide, 50 kg of aluminum nitride, 2.4 kg of titanium dioxide were added to the vacuum kneader, at a temperature of 150 ° C, a vacuum of 0.09 MPa, dehydration and blending for 300 minutes , moved into the planetary stirring tank, and set aside.

[0047] At room tem...

Embodiment 2

[0049] One-component high-temperature resistant gasket-free sealant, by weight ratio, includes the following components:

[0050] α, ω-dihydroxy polysiloxane 100 kg

[0051] α, ω-Dihydroxypolydiphenylsiloxane 100 kg

[0052] Tetrabutanoximinosilane 40 kg

[0053] Fumed silica 100kg

[0054] Active Zinc Oxide 50kg

[0055] Aluminum nitride 50 kg

[0056] MTD silicone oil 5kg

[0057] Iron oxide red 2 kg

[0058] γ-Aminopropyltriethoxysilane 2 kg

[0059] Preparation:

[0060] 100 kg of α, ω-dihydroxypolysiloxane (viscosity of 80000 mPas at 25 °C), 100 kg of α, ω-dihydroxy polydiphenylsiloxane (viscosity of 30000 mPas at 25 °C), fumed silica (Specific surface area 200 cubic meters per gram) 100 kg, 50 kg of active zinc oxide, 50 kg of aluminum nitride, and 2 kg of iron oxide red are added to the vacuum kneader, at a temperature of 150 ° C, a vacuum of 0.09 MPa, dehydration and blending After 300 minutes, move it into a planetary stirring tank and set aside.

[0061] At r...

Embodiment 3

[0063] One-component high-temperature resistant gasket-free sealant, by weight ratio, includes the following components:

[0064] α, ω-dihydroxy polysiloxane 100 kg

[0065] α, ω-Dihydroxypolydiphenylsiloxane 100 kg

[0066] Tetrabutanoximinosilane 40 kg

[0067] Fumed silica 100kg

[0068] Active Zinc Oxide 90kg

[0069] Cerium oxide 10 kg

[0070] MTD silicone oil 5kg

[0071] Acetylene carbon black 2 kg

[0072] γ-Aminopropyltriethoxysilane 2 kg

[0073] γ-(glycidoxy)propyltrimethoxysilane 0.5kg

[0074] Preparation:

[0075] 100 kg of α, ω-dihydroxy polysiloxane (viscosity of 80,000 mPas at 25°C), 100 kg of α, ω-dihydroxy polydiphenylsiloxane (viscosity of 30,000 mPas at 25°C), fumed silica (Specific surface area 200 cubic meters / gram) 100 kg, 90 kg of active zinc oxide, 10 kg of cerium oxide, 2 kg of acetylene carbon black were added to the vacuum kneader, at a temperature of 150 ° C, a vacuum of 0.09 MPa, dehydration blending 300 Minutes, move into planetary st...

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PUM

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Abstract

The invention belongs to the field of sealing materials, particularly relates to a one-component high temperature-resistant gasket-free sealant and a preparation method thereof. The sealant comprises the following components in parts by weight: 10-100 parts of base materials, 10-100 parts of filler, 10-100 parts of heat resistant filler, 5-20 parts of crosslinker, 1-10 parts of thixotropic agent,2-4 parts of pigment, and 0.5-2 parts of viscosity increaser. Through phenyl group-containing organic siloxane polymer as the base material, in combination with the filler, the sealant provided by the invention has greatly improved high temperature resistance. The sealant has the advantages of good temperature resistance, and high adhesive bonding capacity and is stable in store. In addition, catalysis is not used, and the pollution to the base material is reduced.

Description

technical field [0001] The invention belongs to the field of sealing materials, in particular to a single-component high-temperature-resistant gasket-free sealant and a preparation method thereof. Background technique [0002] Gasket-free sealant can replace various rubber pads, asbestos pads, cork pads and cardboard pads, etc. It can seal the flange joint surfaces of automobiles, motorcycles and various mechanical equipment engines, gearboxes, axles, etc. It is not limited by the size and shape of the joint surface, and is widely used for sealing and leakproofing of various parts of machinery. [0003] Ordinary gasket-free sealants have limited heat resistance, and at high temperatures above 200°C, problems such as decreased elasticity and aging of the glue will occur, which will affect the sealing effect. Chinese patent CN 101250391A titled "Single-component high-temperature-resistant silicone sealant" introduces phenyl groups into the main chain of hydroxyl-terminated po...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/06C09J11/04C09K3/10
Inventor 姜银辉冉锋邹尚伟潘岩田学森刘泽龙
Owner GLEIHOW NEW MATERIALS CO LTD
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