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Method for improving absorption speed of water swelling rubber by employing fibre

A water-swellable rubber and water-absorbing speed technology, which is applied in the field of sealing materials, can solve problems such as the decline in rubber mechanical properties and the unsatisfactory water-absorbing speed of polyethylene glycol, and achieve the goal of improving water-absorbing performance, improving the applicable temperature range, and increasing water-absorbing speed Effect

Inactive Publication Date: 2008-03-12
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hu Xiangqing, Zhang Guo, etc. added polyethylene glycol to the water-swellable rubber, which can improve the water absorption speed to a certain extent, but it will lead to a decrease in the mechanical properties of the rubber and the water absorption speed in the secondary water absorption due to the loss of polyethylene glycol in water. not ideal

Method used

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  • Method for improving absorption speed of water swelling rubber by employing fibre

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] Add cellulose staple fibers (i.e. cellulose fibers with a length of about 1mm cm) with a mass ratio of 10:50:50, octyl acrylate, and neoprene into the container, stir continuously until they are evenly dispersed, pour them out, and heat them at 80°C Vacuum dried to obtain mixture A. (parts by mass, the same below) 50 parts of mixture A, 50 parts of neoprene rubber, 30 parts of acrylic water-absorbing resin, 5 parts of paraffin oil, 1 part of stearic acid, 5 parts of zinc oxide, 4 parts of magnesium oxide, 2 parts of anti-aging Agent D, 1 part of accelerator CZ, and 30 parts of pottery clay were mixed evenly on the double-roller mill, and after standing for 12 hours, the mixed rubber material was pressed and molded, and then directly sent to the vulcanization device for vulcanization (vulcanized The temperature is 200°C, the pressure is 10MPa, and the time is 30min), to obtain a water-swellable rubber that can expand with water in the range of 25°C to 150°C. Take 10 gra...

Embodiment 2

[0031] Add aramid fiber staple fiber (that is, aramid fiber, about 5mm in length), butyl acrylate, and nitrile rubber with a mass ratio of 15:100:30 into the container, stir continuously until the dispersion is uniform, pour it out, and put it at 80°C Vacuum dried to obtain mixture A. Will (mass parts, the same below) 50 parts of mixture A, 50 parts of nitrile rubber, 30 parts of acrylic water-absorbing resin, 5 parts of plasticizer DOP, 1 part of stearic acid, 5 parts of zinc oxide, 2 parts of sulfur, 1 part of Antiaging agent RD, 1 part of antiaging agent MB, 1 part of accelerator DM, 0.5 part of accelerator M, 20 parts of semi-reinforcing carbon black, and 20 parts of white carbon black are mixed evenly on a double-roller mill, and then placed for 12 hours , after the mixed rubber material is pressed and molded, it is directly sent to the vulcanization device for vulcanization (the vulcanization temperature is 150°C, the pressure is 10MPa, and the time is 30min). Water-swe...

Embodiment 3

[0033]Add short cotton fibers (i.e. cotton fibers with a length of about 0.5mm), butyl acrylate and butyl rubber with a mass ratio of 20:100:40 into the container, stir continuously until they are evenly dispersed, pour them out, and vacuum them at 80°C Dry to obtain mixture A. (Mass parts, the same below) 50 parts of mixture A, 50 parts of butyl rubber, 30 parts of acrylic water-absorbing resin, 5 parts of paraffin wax, 1 part of stearic acid, 5 parts of zinc oxide, 2 parts of sulfur, 1 part of anti-aging agent D , 30 parts of carbon black, and 2 parts of accelerator are mixed evenly on the double-roller mill, and after standing for 12 hours, the mixed rubber material is pressed and molded, and then directly sent to the vulcanization device for vulcanization (temperature 150 ° C, The pressure is 10 MPa, the time is 30 minutes), and the water-swellable rubber that can expand with water in the range of 25°C to 150°C is obtained. Take 10 grams of the water-swellable rubber samp...

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Abstract

The present invention relates to a method to improve the water-absorption speed of rubber which swells in water by means of fiber. The present invention is characterized in the following steps: 1) short fiber, solvent and rubber with the mass ratio of 5 to 40:50 to 100:10 to 100 are added into a container, which are constantly stirred until the materials are evenly dispersed; then the mixture is spilled out from the container and is dried in vacuum at the temperature of 80 DEG C to get mixture A; 2) rubber, mixture A, absorbent resin, plasticizer, stearic acid, zinc oxide, curing agent, antioxidant, reinforcing agent and accelerator are mixed together with the quality ratio of 50:50:10 to 60:0 to 15:0.5 to 3:2 to 6:0.5 to 5:0 to 3:30 to 60:0.5 to 3 ratio to generate mixture B; 3) mixture B is placed evenly on the twin-roll open mill to get rubber which swells in water within the temperate range between 25 DEG C to 150 DEG C. The method can enhance the water-absorption speed of the rubber which swells in water, and can maintain the mechanical properties of the rubber.

Description

technical field [0001] The invention belongs to the field of sealing materials, in particular to a method for improving the water-absorbing speed of water-swellable rubber by using fibers. Background technique [0002] Water swelling rubber (WSR for short) is a new type of functional material, which is made by introducing hydrophilic functional groups or hydrophilic components into the traditional elastic matrix (rubber). Its mechanism of action is: when in contact with water, water molecules will enter the WSR through physical effects such as diffusion, capillary and surface adsorption, and then form a strong affinity with the hydrophilic groups in the rubber. Absorb water, causing the rubber to deform. When the deformation resistance and osmotic pressure difference are balanced, WSR remains relatively stable, achieving the effect of elasticity and water stop. Since its appearance in the late 1970s and early 1980s, WSR has been known for its unique dual water-stop characte...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L11/00C08L23/16C08L9/00C08L75/04C08L83/04C08L23/22C08L33/00C08L3/02C08L1/00C08L29/04C08K7/02C08J5/04C08K3/00
Inventor 刘长生杨鹏丁军平李秀辉朱仕惠
Owner WUHAN INSTITUTE OF TECHNOLOGY
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