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Method for modifying water encounter swelling rubber by using hydrophobic monomer

A water-swellable rubber and hydrophobic monomer technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as difficulty in functioning of nano-components, decreased water absorption capacity of WSR, and small particle size of nanoparticles, etc., to achieve The modification process is reliable, the mechanical properties and water absorption properties are improved, and the loss rate is low

Inactive Publication Date: 2009-04-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size, large specific surface area, and high surface energy of nanoparticles, it is easy to form aggregates with large particle sizes, making it difficult for nanocomponents to play a role.
At the same time, rubber is a hydrophobic material, while the water-absorbing component is a strong hydrophilic material. The two are difficult to be compatible stably, so that the water-absorbing resin, especially the water-absorbing resin with large particle size, cannot be well dispersed in the rubber substrate, resulting in obvious water absorption capacity of WSR. decline

Method used

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  • Method for modifying water encounter swelling rubber by using hydrophobic monomer
  • Method for modifying water encounter swelling rubber by using hydrophobic monomer

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Utilize the method for modifying water-swellable rubber by hydrophobic monomer, it comprises the steps:

[0041] 1) Preparation of modified water-absorbent resin: Add 7.5g of acrylic acid, 10g of vinyl acetate, 40g of butyl acrylate, 0.02g of ethylene glycol diacrylate (i.e. Diol diacrylate), 0.1g potassium persulfate, after ultrasonic dispersion (i.e. mixing evenly), let it stand for 30min to fully swell, then heat to 70°C for polymerization reaction for 1h, take out the resin, and dry it at 80°C. Sexual water-absorbent resin;

[0042] 2) Mix 100 parts (parts by mass, the same below) of nitrile rubber, 30 parts of modified water-absorbing resin, 5 parts of plasticizer DOP, 1 part of stearic acid, 5 parts of zinc oxide, 2 parts of sulfur, and 1 part of antioxidant RD , 1 part of anti-aging 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 were mixed evenly on a double-roller mill...

Embodiment 2

[0045] Utilize the method for modifying water-swellable rubber by hydrophobic monomer, it comprises the steps:

[0046] 1) Preparation of modified water-absorbent resin: Add 15g of acrylic acid, 20g of octyl acrylate, 20g of butyl acrylate, 0.05g of diethylene glycol diacrylate, 0.1g of Potassium persulfate, after ultrasonic dispersion (that is, mixing evenly), let it sit for 30 minutes to fully swell, then heat it to 70°C for 1 hour, take out the resin, and dry it at 80°C to obtain a modified water-absorbent resin;

[0047] 2) Mix 100 parts (parts by mass, the same below) of nitrile rubber, 30 parts of modified water-absorbing resin, 5 parts of plasticizer DOP, 1 part of stearic acid, 5 parts of zinc oxide, 2 parts of sulfur, and 1 part of antioxidant RD , 1 part of anti-aging 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 were mixed evenly on a double-roller mill, and after standing...

Embodiment 3

[0050] Utilize the method for modifying water-swellable rubber by hydrophobic monomer, it comprises the steps:

[0051] 1) Preparation of modified water-absorbent resin: Add 20 g of acrylic acid, 40 g of butyl methacrylate, 10 g of vinyl acetate, 0.05 g of diethylene glycol diacrylate, 0.5g potassium persulfate and 0.15g sodium bisulfite, after ultrasonic dispersion, place for 30min to fully swell, then warm to 50°C for 1h reaction, take out the resin, dry at 80°C to obtain modified water-absorbent resin;

[0052] 2) Mix 100 parts (parts by mass, the same below) of chloroprene rubber, 30 parts of modified water-absorbing resin powder, 5 parts of paraffin oil, 1 part of stearic acid, 5 parts of zinc oxide, 4 parts of magnesium oxide, and 2 parts of anti-aging agent D. 1 part of accelerator CZ and 30 parts of pottery clay are mixed evenly on a double-roller open mill. After standing for 12 hours, the mixed rubber is pressed and molded, and directly sent to the vulcanization devi...

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Abstract

The invention belongs to the sealing material field and provides a method for carrying out modification to water-swelling rubber by using hydrophobicity monomer. The method is characterized by comprising the following steps: according to average particle size, the mass ratio of nano-level polyacrylic high-water absorption resin powder, acrylic acid, hydrophobic monomer, a cross-linking agent and an initiator is 100: 5 to 30: 20 to 60: 0.01 to 10: 0.01 to 0.5; according to the mass ratio, the materials are selected, uniformly mixed, placed for 30 to 60 minutes, carries out with swelling, and carries out with polyreaction for 20 to 60 minutes after being heated to 40 DEG C to 70 DEG C; the resin is taken out and dried at the temperature of 60 DEG C to 80 DEG C so as to obtain modified water absorption resin; and 2) according to the mass ratio of 100: 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, rubber, modified water absorption resin, plasticizer, stearic acid, zinc oxide, a vulcanizing agent, an aging resister, a reinforcing agent and an accelerating agent are selected, mixed on a double roll mixing mill uniformly, formed, and vulcanized so as to obtain the water-swelling rubber. The method can avoid the gather of nano particles of water absorption resin, also can improve the compatibility of the water absorption resin in the rubber and leads the water absorption resin to be dispersed in the rubber.

Description

technical field [0001] The invention belongs to the field of sealing materials, in particular to a method for modifying water-swellable rubber by using hydrophobic monomers. Background technique [0002] Water swelling rubber (Water swelling Rubber, referred to as WSR) is a new type of functional material. Since its appearance in the late 1970s and early 1980s, WSR has double water sealing with its unique elastic sealing and water absorption swelling. characteristic. More and more attention has been paid. It can be widely used in tunnels, subways, culverts, swimming pools, basements, armories, granaries, underwater projects, offshore oil production, urban water supply facilities, civil buildings, etc. It can also be used for waterproof and moisture-proof packaging of automobile containers, precision instruments, and food and other fields. The traditional sealing material needs to be compressed by 35% to achieve the effect, and the water-absorbing swelling rubber can reali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L51/00C08L11/00C08L7/00C08L23/16C08L23/28C08L75/04C08L27/12C08L83/04C08L23/22C08L9/06C08K13/02C09K3/10C08F265/02
Inventor 李秀辉杨鹏吴江渝喻湘华郭庆中鄢国平杨帆
Owner WUHAN INSTITUTE OF TECHNOLOGY
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