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Temperature-resistant acid- and alkali-resistant organosilicone sealant and preparation method thereof

A sealant and silicone technology, applied in the field of sealants, can solve the problems of unsatisfactory heat resistance, low bonding strength, poor curing performance, etc., and achieve a simple and easy preparation method, suitable extrusion rate, and fast vulcanization speed. Effect

Inactive Publication Date: 2019-05-10
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some adhesives currently used for industrial anticorrosion, such as phenolic resins, have excellent acid resistance, but because the structure contains a large number of phenolic groups, they are easy to interact with alkali, have poor alkali resistance, and have insufficient heat resistance after curing. Ideal; the furan resin adhesive developed in the 1940s has the advantages of good heat resistance, high mechanical strength and good chemical stability, but there are also defects such as low bonding strength and poor curing performance

Method used

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  • Temperature-resistant acid- and alkali-resistant organosilicone sealant and preparation method thereof
  • Temperature-resistant acid- and alkali-resistant organosilicone sealant and preparation method thereof
  • Temperature-resistant acid- and alkali-resistant organosilicone sealant and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] The preparation method of a kind of temperature-resistant, acid and alkali-resistant silicone sealant of the present embodiment is as follows:

[0047](1) 100 parts by mass of alkoxy-terminated polydimethylsiloxane (kinematic viscosity at 25°C is 20 Pa·s) with the structure of formula (3), 60 parts by mass of methyl phenyl silicone resin surface treatment The precipitated barium sulfate (average particle size is 1.0 μm, the treatment method is: put the precipitated barium sulfate into a high-speed mixer with a blower device at the bottom, and then atomize and spray the isopropanol solution of methylphenyl silicone resin On the surface of the precipitated barium sulfate, the temperature was raised to 120° C. and heated and stirred for 60 min, and the isopropanol was evaporated to obtain a surface-treated precipitated barium sulfate with a methylphenyl silicone resin content of 1.8%. The average particle diameter of 12 parts by mass was 5 μm. Polytetrafluoroethylene (PTFE...

Embodiment 2

[0052] The preparation method of a temperature-resistant, acid and alkali-resistant silicone sealant of this embodiment is as follows:

[0053] (1) 100 parts by mass of alkoxy-terminated polydimethylsiloxane (kinematic viscosity at 25°C is 60 Pa·s) with the structure of formula (5), 60 parts by mass of methyl phenyl silicone resin surface treatment The quartz powder (average particle size is 2.0μm, the treatment method is: put the quartz powder into a high-speed mixer with a blower device at the bottom, and then atomize and spray the isopropanol solution of methylphenyl silicone resin on the quartz powder surface, heated up to 150°C and heated and stirred for 60min, and obtained surface-treated quartz powder with a methylphenyl silicone resin content of 0.8% after steaming off the isopropanol), 60 parts by mass of mica powder treated with methylphenyl silicone resin surface (The average particle size is 20 μm, and the treatment method is: drop the mica powder into a high-speed...

Embodiment 3

[0058] The preparation method of a temperature-resistant, acid and alkali-resistant silicone sealant of this embodiment is as follows:

[0059] (1) 100 parts by mass of alkoxy-terminated polydimethylsiloxane (with a kinematic viscosity of 20 Pa s at 25°C) having a structure such as formula (3), and 60 parts by mass of methylphenyl silicone resin surface treatment The quartz powder (average particle size is 1.5μm, the treatment method is: put the quartz powder into a high-speed mixer with a blower device at the bottom, and then atomize and spray the isopropanol solution of methylphenyl silicone resin on the quartz surface of the powder, heated to 130°C and stirred for 60min, evaporated the isopropanol to obtain a surface-treated quartz powder with a methylphenyl silicone resin content of 1.0%, 40 parts by mass of mica powder treated with a methylphenyl silicone resin surface (The average particle size is 12 μm, and the processing method is: drop the mica powder into a high-spee...

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Abstract

The invention relates to an organosilicone sealant and a preparation method thereof. The organosilicone sealant is made from, by weight, 100 parts of an alkoxy-terminated polydimethylsiloxane, 60-120parts of a surface-treated inert filler, 10-20 parts of PTFE (polytetrafluoroethylene) powder, 5-10 parts of fumed silica, 10-15 parts of a crosslinker, 0.05-0.5 part of a catalyst, and 2-4 parts of an adhesion promoter. The surface-treated inert filler is an inert filler subjected to surface treatment via methyl phenyl silicone resin; the inert filler is selected from at least one of quartz powder, mica powder and precipitated barium sulfate. The organosilicone sealant has high adhesive power and good elasticity, as well as excellent weatherability, can maintain durable adhesion in the long-term acidic and alkaline environment with a certain temperature, and is applicable to anticorrosion adhesion and sealing for chemical industrial equipment and pipelines.

Description

technical field [0001] The invention relates to the technical field of sealant, in particular to a temperature-resistant, acid-alkali-resistant silicone sealant and a preparation method thereof. Background technique [0002] With the rapid development of the modern chemical industry and the scale and automation of the chemical production process, more and more closed integrated manufacturing equipment has been used. The chemical reaction process is often carried out in acid, alkali, organic solvent or its alternate medium, which requires chemical equipment such as reactors and delivery pipelines to have good acid resistance, alkali resistance or organic solvent resistance. In addition, the high temperature associated with the reaction also requires chemical equipment to have sufficient temperature resistance. For such harsh conditions, ordinary metal materials are far from meeting the requirements for use, and precious metals or special alloys lack economic benefits due to ...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/04C09J11/08
Inventor 庞文健李福中付子恩郑常华王兵袁强
Owner GUANGZHOU BAIYUN CHEM IND
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