Preparation method of reaction-compatibilizing nitrile water-swellable rubber

A technology of water-swelling rubber and reaction compatibilization, applied in the field of sealing materials, can solve the problems of complex preparation method of compatibilizer, complex compatibilizer synthesis process, large mass loss rate, etc. Loss rate reduction effect

Inactive Publication Date: 2016-03-02
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Zhang Zhihao et al. used PVA-g-PBA (polyvinyl alcohol grafted polybutyl acrylate amphiphilic graft copolymer) as a compatibilizer, and prepared WSR using epichlorohydrin rubber and cross-linked polyacrylate. The mass loss rate after immersion in water Dropped from 18.82% without adding to 14.32%, but the mass loss rate is still relatively large
[0005] Wang Caiqi and others used the amphiphilic block copolymer PEO-b-PBA (polyethylene oxide block polybutylacrylate) to improve the compatibility of sodium polyacrylate water-absorbing resin and natural rubber, and the mass loss rate was relatively large. Moreover, the compatibilizer synthesis process is complex and requires high equipment
[0006] Xie Jingsi et al. prepared compatibilizer P(AM-g-NBR) by solution grafting method to compatibilize nitrile rubber and SAR-PA water-absorbing resin system. The preparation method of compatibilizer is complicated and requires a large amount of solvent

Method used

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  • Preparation method of reaction-compatibilizing nitrile water-swellable rubber
  • Preparation method of reaction-compatibilizing nitrile water-swellable rubber
  • Preparation method of reaction-compatibilizing nitrile water-swellable rubber

Examples

Experimental program
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Effect test

Embodiment 1～5

[0033] The preparation steps of reactive compatibilizer are as follows:

[0034] Add 30g of NBR to the torque rheometer, and then add a mixture of 0.3g of maleic anhydride and 3g of dicumyl peroxide. °C, the third section is 110 °C, and the reaction is 5 minutes. After the grafting reaction was completed, the grafted product was taken out and placed in a Soxhlet extractor for extraction with tetrahydrofuran for 24 hours, and the unreacted initiator, maleic anhydride, and maleic anhydride homopolymer were extracted to obtain the compatibilizer Ma Toric anhydride / nitrile rubber graft copolymer.

[0035] The compatibilizer maleic anhydride grafted acrylonitrile-butadiene rubber prepared in the last step is applied in water-swellable acrylonitrile-butadiene rubber, and its steps are as follows:

[0036] 1) After plasticizing 100 parts of nitrile rubber on the open mill for 1 min with a thin open roll, add 1.5 parts of stearic acid, 5 parts of ZnO, 1.5 parts of sublimed sulfur, 1...

Embodiment 6～10

[0047] 1) After plasticizing 100 parts of nitrile rubber on the open mill for 1 min with a thin open roll, add 1.5 parts of stearic acid, 5 parts of ZnO, 1.5 parts of sublimed sulfur, 1 part of anti-aging agent D, 10 parts PEG-8000, after rolling evenly (about 3min) at a roller distance of 2 mm, then add 30 to 70 parts of sodium polyacrylate and 8 parts of compatibilizer and mix evenly, then add 20 parts of carbon as a reinforcing filler Black and 20 parts of white carbon black were kneaded for 10 minutes at a roll distance of 3 mm. Finally, 2 parts of vulcanization accelerator DM and 2 parts of vulcanization accelerator CZ were added and mixed evenly. Triangular bag 6 times, thin pass, sliced, and stand for 4 hours for later use.

[0048] 2) Place the kneaded nitrile rubber in a tableting mold, vulcanize it on a flat vulcanizer at 160°C for 15 minutes (pressure is 10Mpa), open the mold, take out the vulcanized water-swellable nitrile rubber, and let it stand for 24 hours , c...

Embodiment 11～15

[0051] 1) After 100 parts of nitrile rubber is masticated on the open mill with a thin open roll for 1 min, 1.5 parts of stearic acid, 5 parts of ZnO, 1.5 parts of sublimed sulfur, 1 part of anti-aging agent 4010NA, 0~ 12 parts of PEG-6000, after the roller distance is 2mm, knead evenly (about 3min), then add 50 parts of polypropylene lithium, 8 parts of compatibilizer (the compatibilizer prepared in Example 1) and knead After uniformity, add 20 parts of carbon black and 20 parts of white carbon black as reinforcing fillers, and knead for 10 minutes on a roller distance of 3 mm. Finally, add 2 parts of vulcanization accelerator DM and 2 parts of vulcanization accelerator CZ to mix. Evenly smelted, with a roller distance of 0.4 mm, bagged 6 times, thinly passed, and then sliced, and left to stand for 4 hours for later use.

[0052] 2) Place the kneaded nitrile rubber in a tableting mold, vulcanize it on a flat vulcanizer at 160°C for 10 minutes (pressure is 10Mpa), open the mol...

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Abstract

The invention relates to a method for preparing reactive compatibilization-type nitrile water-swelling rubber. The method comprises the following steps: sequentially adding an active agent A, an active agent B, a vulcanizing agent, an anti-aging agent, a water absorbing additive and a bulking agent after plastifying nitrile rubber on an open mill by adopting a thinning coating roll; adding water-absorbing resin to evenly mix after mixing evenly, and then adding reinforcing filler carbon black and white carbon black; milling, and finally adding a vulcanization accelerator A and a vulcanization accelerator B to evenly mix; packaging into a triangular packet; thinning, batching off and standing for later use; putting the mixed nitrile rubber into a tabletting mold; vulcanizing, opening the mold, taking out the vulcanized water-swelling nitrile rubber, standing and cutting. The method has the advantages and beneficial effects that the preparation method is simple, and low in requirement on equipment, so as to save the cost. The method can be widely applied to tunnels, culverts, swimming pools, basements, underwater engineering, downhole oil recovery, water supply facilities, civil construction and the like.

Description

technical field [0001] The invention relates to a preparation method of a reaction compatibilization type nitrile water-absorbing swelling rubber, which belongs to the field of sealing materials. technical background [0002] Water-swelling rubber (WaterswellingRubber referred to as WSR) is a new type of functional polymer material made by introducing hydrophilic groups or water-absorbing components into the rubber matrix. A new type of functional polymer material developed since the 1970s, which can expand to several times or even hundreds of times its own mass after absorbing water. And while maintaining the elasticity of the rubber, it also has water retention. It can be widely used in waterproofing of building deformation joints, construction joints, underwater instruments and military weapons, as well as joints of metal, concrete, ceramics, plastics, steel and other pipes and box culverts. Compared with traditional pressure sealing materials, water-swellable rubber no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/02C08L51/04C08F279/02C08K13/02C08K5/09C08K3/22C08K5/18C08K3/04C08K3/36C08K3/06
Inventor 杨隽姚棋郭雅妮谢浩杨晓梅徐黎刚闫霜
Owner WUHAN INSTITUTE OF TECHNOLOGY
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