A kind of preparation method of rubber/clay composite material resistant to heat and oxygen aging

A composite material and nanocomposite material technology, which is applied in the field of preparing clay and rubber nanocomposite materials, can solve the problems that have not yet been reported in research, and achieve the effects of improving mechanical properties, better dispersibility, and simple and environmentally friendly preparation process.

Active Publication Date: 2016-05-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Foreign literature reports that the synthesis of melanin to improve the aging resistance of polymers is mainly carried out in plastics, but the research on rubber materials has not been reported.

Method used

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  • A kind of preparation method of rubber/clay composite material resistant to heat and oxygen aging
  • A kind of preparation method of rubber/clay composite material resistant to heat and oxygen aging
  • A kind of preparation method of rubber/clay composite material resistant to heat and oxygen aging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The sodium-based montmorillonite and deionized water were prepared as a 5% mass fraction suspension in proportion, stirred at a speed of 1600 rpm for 8 hours, and then allowed to stand for 24 hours to obtain a stable upper layer with a solid content of 2% Aqueous clay suspension. Measure 250 grams of the above-mentioned clay suspension and conduct ultrasonic peeling treatment (ultrasonic power is 750 watts, ultrasonic time is 3 seconds, interval time is 2 seconds, working cycle is 99 times, the whole process is repeated 6 times); 0.375 g of dopamine, 0.3 g Tris, adjust the pH to 8.5, react for 4 hours at room temperature and high-speed stirring (1000 rpm) to obtain a suspension of dopamine modified clay; combine the suspension of dopamine modified clay with 510.2 grams of styrene butadiene latex (brand 1502, solid content 19.6%) stir and mix at room temperature for 30 minutes at a stirring speed of 600 rpm; then add the dopamine-modified clay-latex mixture to 3 liters (m...

Embodiment 2

[0039] The operation steps are the same as in Example 1. Measure 500 grams of sodium-based montmorillonite suspension with a mass fraction of 2%, after ultrasonic treatment (ultrasonic power is 750 watts, ultrasonic time is 3 seconds, interval time is 2 seconds, working cycle 99 times, the whole process is repeated 6 times ), add 1.0 g of dopamine, 0.75 g of tris, adjust the pH to 9, and react for 6 hours to obtain a suspension of dopamine modified clay; combine it with 510.2 g of styrene butadiene latex (brand 1502, solid content 19.6%, below Same) uniform mixing; flocculation, washing, drying, mixing and vulcanization to obtain dopamine modified clay / styrene butadiene rubber nanocomposite, including 100 parts of styrene butadiene rubber and 10 parts of dopamine modified clay. Other process conditions are the same as in Example 1. The mechanical properties of composite materials are shown in Table 1, and the thermogravimetric analysis curve of composite materials is shown in ...

Embodiment 3

[0041] The sodium-based rectorite and deionized water were configured as a 5% mass fraction suspension in proportion, stirred at a speed of 1600 rpm for 8 hours, and then allowed to stand for 24 hours to obtain a stable upper layer with a solid content of 2% Aqueous clay suspension. Measure 200 grams of clay suspension with a mass fraction of 2%, and after ultrasonic treatment (ultrasonic power is 1000 watts, ultrasonic time is 3 seconds, interval time is 2 seconds, working cycle is 99 times, the whole process is repeated 8 times), add 0.3 Cedopa, 0.24 g of tris, adjusted to pH 8.5, reacted for 4 hours to obtain a suspension of dopa modified clay; combine it with 166.7 g of natural rubber latex (solid content 60%, the same below) and 33 ml Ionized water is mixed uniformly; after flocculation, washing, and drying, a dopa modified clay / natural rubber nanocomposite is obtained, including 100 parts of natural rubber and 4 parts of dopa modified clay; on a two-roll mill, the dopa mo...

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Abstract

The invention relates to a preparation method of a rubber/clay composite material with thermo-oxidative aging resistance, and belongs to the field of preparation of rubber nanometer composite materials. The preparation method comprises the following steps of: adding a catecholamine monomer to clay water suspending liquid subjected to ultrasonic stripping pretreatment, and depositing through self-aggregation on the surface of a clay lamella under room-temperature aerobic alkaline conditions; then compounding with a rubber matrix through an emulsion blending mode, and flocculating, washing, drying, mixing and vulcanizing to obtain the rubber/clay composite material. According to the rubber/clay composite material prepared through the method, modified clays are uniformly and finely dispersed into the rubber matrix at nanometer scale; the surface coating of the rubber/clay composite material can be reacted with active free radicals generated through the thermo-oxidative aging of rubbers, and a high-dispersion lamella prevents the dispersion of active substances, so that the surface coating and the high-dispersion lamella endue good thermo-oxidative aging resistant property to the rubber/clay composite material together. The preparation method disclosed by the invention is high-efficiency and environmentally friendly, enhances the thermo-oxidative aging resistance and achieves obvious effect.

Description

Technical field [0001] The invention relates to a method for preparing a clay and rubber nanocomposite material, in particular to a method for modifying the surface of natural clay with catecholamine and compounding it with rubber latex by an emulsion blending method to prepare a rubber with good heat and oxygen aging properties. Clay nanocomposite method. Background technique [0002] Clay is a natural layered nanomaterial with highly ordered lattice arrangement. The thickness of the crystal layer is about 1 nanometer, and the width ranges from several hundred nanometers to several thousand microns. The unique structural characteristics (extremely high surface area, diameter-to-thickness ratio) and high modulus of clay make it a nano-barrier and reinforcing filler widely used in polymer matrix, giving the matrix good flame retardancy. , Aging resistance, air tightness and mechanical properties. [0003] The aging of rubber refers to the phenomenon that the material undergoes phy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/08C08L7/02C08K9/04C08K3/34
Inventor 王文才王璐张立群田明刘力王益庆
Owner BEIJING UNIV OF CHEM TECH
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