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Fiber modified water-expandable waterproof rubber sealing material and preparation method thereof

A water-swelling and rubber sealing technology, which is applied in the field of fiber-modified water-swelling waterproof rubber sealing materials and its preparation, can solve the problems of rubber mechanical properties decline, chemical stability, poor mechanical properties, and unsatisfactory water absorption speed and other problems, to achieve the effects of improved compatibility, excellent water-swelling sealing performance, and excellent chemical stability

Inactive Publication Date: 2016-10-12
ANHUI RONGDA VALVE
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Problems solved by technology

Chinese patent CN 101139448 A reports a method of using fiber to improve the water absorption speed of water-swellable rubber. This method improves the water absorption speed of water-swellable rubber to a certain extent, but it is not ideal in terms of chemical stability and mechanical properties; Hu Xiangqing, Zhang Guo, etc. added polyethylene glycol to the water-swellable rubber to improve the water absorption speed to a certain extent, but it would lead to a decrease in the mechanical properties of the rubber, and the water absorption speed during the second water absorption was not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weighing: 100 kg of nitrile rubber, 9 kg of short fiber, 20 kg of bentonite-calcium carbonate microspheres, 12 kg of SAP resin, 9 kg of silicon dioxide, 2 kg of stearic acid, 5 kg of N-phenyl-β-naphthylamine kg, Accelerator D2 kg;

[0025] The bentonite-calcium carbonate microspheres are composed of the following raw materials in parts by weight: 60 parts of calcium chloride, 60 parts of sodium carbonate, 8 parts of sodium dodecylsulfonate, and 8 parts of polyacrylamide.

[0026] Specific steps are as follows:

[0027] (1) Mix short fibers and nitrile rubber in N,N-dimethylformamide solvent, stir continuously until uniform dispersion, filter, and vacuum dry at 90°C to obtain the mixture for later use;

[0028] (2) Preparation of bentonite-calcium carbonate microspheres:

[0029] ①. Prepare calcium chloride solution, sodium carbonate solution, sodium dodecyl sulfonate aqueous solution and polyacrylamide aqueous solution, wherein calcium chloride and calcium carbonate s...

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Abstract

The invention provides a fiber modified water-expandable waterproof rubber sealing material and a preparation method thereof. The fiber modified water-expandable waterproof rubber sealing material is prepared from, by weight, 100 parts of nitrile rubber, 8-16 parts of short fibers, 15-25 parts of bentonite-calcium carbonate micro-spheres, 10-16 parts of SAP resin, 8-12 parts of silica, 1-3 parts of stearic acid, 4-6 parts of N-phenyl-beta-naphthylamine and 1-3 parts of a promoter D. The water absorption speed of the sealing material is improved by combining the short fibers and the water absorption component (the bentonite-calcium carbonate micro-spheres and the SAP resin) in use. In addition, the modified water-expandable waterproof rubber sealing material has higher strength and chemical stability and excellent water absorption and stop properties under the synergistic effect of the sealing material.

Description

technical field [0001] The invention relates to the field of polymer sealing materials, in particular to a fiber-modified water-swellable waterproof rubber sealing material and a preparation method thereof. Background technique [0002] Water Swelling Rubber (WSR for short) is a new functional polymer material developed by Japan in the late 1970s. After absorbing water, it can expand to several times or even hundreds of times its own weight or volume. When it encounters water, it can absorb water to expand its volume and generate a large expansion pressure. Ability. The characteristics of water absorption and expansion make the material play a role of water-stop within the effective volume expansion range. Compared with traditional pressure sealing materials, it not only has the sealing effect of conventional water-stop materials, but also can effectively fill the gap when the building joint is deformed. It plays the role of stopping water with water. Water-absorbing swel...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L101/12C08L33/26C08K13/04C08K7/18C08K3/36C08K5/09C08K3/34C08K3/26
CPCC08L9/02C08L2205/03C08L101/12C08L33/26C08K13/04C08K7/18C08K3/36C08K5/09C08K3/346C08K2003/265
Inventor 胡光荣
Owner ANHUI RONGDA VALVE
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