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Water-swelling nitrile rubber and preparation method thereof

A nitrile rubber and water-absorbing swelling technology, which is applied in the field of functional polymer materials, can solve the problems of high equipment requirements, complex compatibilizer synthesis process, and high mass loss rate, and achieve simple preparation methods, strong action force, and low mass loss. The effect of rate reduction

Inactive Publication Date: 2013-10-02
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 to prepare WSR using epichlorohydrin rubber and cross-linked polyacrylate. The mass loss rate after immersion in water 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

Method used

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  • Water-swelling nitrile rubber and preparation method thereof
  • Water-swelling nitrile rubber and preparation method thereof
  • Water-swelling nitrile rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 1g of nitrile rubber in 30mL of tetrahydrofuran, slowly add 1g of maleic anhydride and 0.16g of benzoyl peroxide in tetrahydrofuran dropwise, raise the temperature to 65°C, and react at constant temperature for 12 hours. After the reaction, the ethanol precipitated the grafted product, and then, washed several times with a large amount of distilled water, placed it in a vacuum drying oven to dry at room temperature, and after drying, extracted it with acetone solution in a Soxhlet extractor for 12 hours to obtain Malay Anhydride grafted nitrile rubber. After fully drying, the compatibilizer (maleic anhydride / nitrile rubber graft) is ready for use. Do infrared test, thermogravimetric test.

[0030] figure 1 In (a), it can be clearly seen that a series of absorption peaks around 2890-2920cm-1 are -CH 3 and -CH 2 The stretching vibration peak of C-H in , 2240cm -1 Nearby is the characteristic absorption peak of -C≡N, 1640cm -1 It is the alkene-C=C- stretchin...

Embodiment 2

[0046] After dissolving 1g of nitrile rubber with 30mL of toluene, slowly add 2.0g of maleic anhydride and 0.2g of benzoyl peroxide in toluene solution dropwise, raise the temperature to 55°C, and react at constant temperature for 10h. After the reaction, the grafted product was precipitated with distilled water, then washed several times with a large amount of distilled water, dried in a vacuum oven at room temperature, dried and extracted with a mixed solution of ethylene glycol and glacial acetic acid in a Soxhlet extractor After drying for 12 hours, the compatibilizer (maleic anhydride / nitrile rubber graft) was obtained for use.

[0047] The compatibilizer obtained in Example 2 is applied to the water-absorbing swellable nitrile rubber, and the specific implementation is the same as in Example 1, but the addition amount of the compatibilizer is kept unchanged, and the addition amount of the water-absorbent resin is changed.

[0048] Formula (amount by weight) and test resu...

Embodiment 3

[0052] Dissolve 1g of nitrile rubber in 30mL of tetrahydrofuran, slowly add 1.2g of maleic anhydride and 0.08g of benzoyl peroxide in tetrahydrofuran dropwise, raise the temperature to 63°C, and react at constant temperature for 8h. After the reaction, distilled water precipitated the grafted product, and then, washed several times with a large amount of distilled water, placed it in a vacuum drying oven and dried at room temperature, dried and extracted with acetone solution for 12 hours in a Soxhlet extractor, and obtained after drying Compatibilizer (maleic anhydride / nitrile rubber graft) spare.

[0053] The compatibilizer obtained in Example 3 is applied to water-swellable nitrile rubber, and the specific implementation method is the same as in Example 1, but the amount of the compatibilizer is kept constant, and the addition amount of sublimed sulfur is changed.

[0054] See Table 3 for the formula (consumption in parts by weight) and test results.

[0055] table 3

...

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Abstract

The invention relates to a sealing material, and in particular relates to a water-swelling nitrile rubber and a preparation method thereof. The water-swelling nitrile rubber is prepared by the following raw materials in parts by weight: 100 parts of nitrile rubber, 6.5 parts of active agent, 1 part of antioxidant, 40 parts of reinforcing filler, 4 parts of vulcanization accelerator, 0.5 to 2.5 parts of sublimed sulfur, 30 to 70 parts of water-absorbent resin, 10 parts of water-absorbing agent, and 5 to 20 parts of compatibilizer, wherein the compatibilizer is a maleic anhydride / nitrile rubber graft product. Compared with the traditional method for preparing the water-swelling nitrile rubber, the matrix of the water-swelling nitrile rubber prepared by the method has strong interaction with a water-absorbent resin, the water-absorbent resin does not easily fall off, the absorbency is increased, and the mass loss rate of the water-absorbent resin is reduced, so that the object that the rubber matrix and the water-absorbent component are evenly mixed can be achieved, and thus the cost is saved, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a sealing material, especially a water-swellable nitrile rubber and a preparation method thereof. Background technique [0002] Water swelling rubber (WSR for short) is a new type of functional polymer material made by introducing hydrophilic groups or water-absorbing components into the rubber matrix. Since its appearance in the late 1970s and early 1980s, water-swellable rubber has attracted people's attention because of its unique dual water-stop function of elastic sealing and water-swelling water-stop. It can be widely used in the waterproofing of building deformation joints, construction joints, underwater instruments and military weapons, as well as the joint waterproofing and sealing of metal, concrete, ceramics, plastics, steel and other pipes and box culverts. Compared with traditional pressure sealing materials, water-swellable rubber not only h...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L51/04C08K5/09C08K3/22C08K3/04C08K3/36C08F279/02
Inventor 杨隽姚棋郭雅妮谢浩徐黎刚闫霜
Owner WUHAN INSTITUTE OF TECHNOLOGY
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