Preparation method of non-asbestos gasket resistant to low temperature and temperature change

An asbestos-free, low-temperature-resistant technology, which is applied in the field of asbestos-free gasket preparation, can solve the problems of flange surface damage at the joint, difficulty in replacing sealing materials, poor performance of temperature resistance, etc., to reduce porosity and porosity, and improve vulcanization Molding effect, effect of improving tensile properties

Inactive Publication Date: 2019-01-15
合肥绿普包装材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wide operating temperature range can basically meet the requirements of modern technology, and the raw materials are abundant and cheap, but at the same time, asbestos also has some disadvantages: (1) It is easy to harden under high temperature conditions, which brings difficulties to the replacement of sealing materials; (2) ) Asbestos is essentially an inorganic silicate fiber, which lacks natural resilience; (3) has high abrasiveness, so it will cause damage to the joint such as the flange surface, which will affect the sealing effect in the later stage; (4) Carcinogenic and radioactive
[0004] In the prior art, although there are many varieties of asbestos-free gaskets, they all have the technical defects of poor temperature resistance and short service life when used in a low temperature environment.

Method used

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  • Preparation method of non-asbestos gasket resistant to low temperature and temperature change

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Embodiment 1

[0020] A preparation method of a non-asbestos gasket resistant to low temperature and temperature change, comprising the following steps:

[0021] (1) In parts by weight, 22 parts of zirconium dioxide, 10 parts of gallium oxide, 2 parts of neodymium oxide, 1 part of aluminum nitride, and 0.6 part of hafnium oxide were added to the ball mill, and after ball milling for 4 hours, compression molding was obtained. The biscuit is calcined and then ground to obtain the inorganic filler;

[0022] (2) In parts by weight, add 20 parts of inorganic fillers to 80 parts of deionized water, and after ultrasonic dispersion is uniform, add 18 parts of expanded graphite to it, heat to 85°C, and keep stirring at a speed of 100r / min for 3 hours. , centrifuge and dry the precipitate, calcinate and grind to obtain the inorganic filler / EG;

[0023] (3) Mix the nitrile rubber and styrene-butadiene rubber evenly according to the mass ratio of 1:1, add them to the deflagging machine to decompose, an...

Embodiment 2

[0030] A preparation method of a non-asbestos gasket resistant to low temperature and temperature change, comprising the following steps:

[0031] (1) In parts by weight, 24 parts of zirconium dioxide, 12 parts of gallium oxide, 3 parts of neodymium oxide, 2 parts of aluminum nitride, and 0.7 part of hafnium oxide were added to the ball mill, and after ball milling for 5 hours, compression molding was obtained. The biscuit is calcined and then ground to obtain the inorganic filler;

[0032] (2) In parts by weight, add 23 parts of inorganic fillers to 90 parts of deionized water, and after ultrasonic dispersion is uniform, add 22 parts of expanded graphite to it, heat to 88°C, and keep stirring at a speed of 130r / min for 3.5 hours. , centrifuge and dry the precipitate, calcinate and grind to obtain the inorganic filler / EG;

[0033] (3) Mix nitrile rubber and styrene-butadiene rubber evenly according to the mass ratio of 1:1, add them to the deflagging machine to decompose, and...

Embodiment 3

[0040] A preparation method of a non-asbestos gasket resistant to low temperature and temperature change, comprising the following steps:

[0041](1) In parts by weight, 26 parts of zirconium dioxide, 13 parts of gallium oxide, 4 parts of neodymium oxide, 3 parts of aluminum nitride, and 0.8 part of hafnium oxide were added to the ball mill, and after ball milling for 6 hours, compression molding was obtained. The biscuit is calcined and then ground to obtain the inorganic filler;

[0042] (2) In parts by weight, add 25 parts of inorganic fillers to 100 parts of deionized water. After ultrasonic dispersion is uniform, add 24 parts of expanded graphite to it, heat to 90°C, and keep stirring at 150r / min for 4 hours. , centrifuge and dry the precipitate, calcinate and grind to obtain the inorganic filler / EG;

[0043] (3) Mix nitrile rubber and styrene-butadiene rubber evenly according to the mass ratio of 1:1, then add them to the deflagging machine to decompose, and obtain fibe...

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Abstract

The invention discloses a preparation method of a non-asbestos gasket resistant to low temperature and temperature change, and the preparation method comprises the following operation steps: (1) adding zirconium dioxide, gallium oxide, cerium oxide, aluminum nitride and cerium oxide to a ball mill, carrying out compression moulding to obtain a biscuit, calcining and grinding to prepare an inorganic filler; (2) adding the inorganic filler to deionized water, adding expanded graphite thereto, centrifuging to obtain a precipitate, drying, calcining and grinding the precipitate to obtain an inorganic filler/EG; and 3) mixing acrylonitrile-butadiene rubber and styrene-butadiene rubber into a disintegrator to obtain fiber-disintegrating granules, and breaking the fiber-disintegrating granules, butadiene-acrylonitrile latex, the inorganic filler/EG, melamine cyanurate, and sodium molybdate dehydrate to obtain slurry, making sheets, drying and vulcanizing to obtain the asbestos-free gasket resistant to low temperature and temperature change. The non-asbestos gasket resistant to low temperature and temperature change is remarkable in low-temperature-resistant effect, the compression-resilience property, and f the non-asbestos gasket resistant still has good compression resilience performance, tensile strength and creep relaxation rate after being subjected to low-temperature frequent treatment.

Description

technical field [0001] The invention belongs to the technical field of sealing gasket preparation, and in particular relates to a method for preparing a non-asbestos gasket resistant to low temperature and temperature change. Background technique [0002] Gaskets are widely used in equipment, instruments, pipelines and instruments in various industries. In the past 100 years, the non-metallic gaskets developed are mainly composite gaskets made of rubber, resin, polytetrafluoroethylene, asbestos and other materials. The non-metallic sealing gasket composite material containing asbestos shows excellent tensile resistance, heat resistance and medium resistance, and creep relaxation resistance. performance is particularly prominent. Traditional sealing gasket materials are mostly plates made of asbestos and rubber. Asbestos fiber is used as the reinforcing material of the gasket, which is mainly processed by rubber mixing, compression into sheets or latex copying. In the past,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/04C08L9/02C08L9/06C08K13/04C08K3/28C08K7/24C08K3/24C08K3/22C08K5/3492
CPCC08K2003/221C08K2003/2244C08K2003/282C08L9/04C08L2205/03C08L9/02C08L9/06C08K13/04C08K3/28C08K7/24C08K3/24C08K3/22C08K5/34922
Inventor 张腾飞
Owner 合肥绿普包装材料有限公司
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