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Compatibilizer of water-swelling nitrile rubber and preparation method of compatibilizer

A nitrile rubber, water-swelling technology, applied in the field of functional polymer materials, can solve the problems of complex compatibilizer synthesis process, poor physical and mechanical properties, large mass loss rate, etc., and achieve strong force, not easy to fall off, and mass loss rate reduction effect

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, and prepared WSR using chlorohydrin rubber and cross-linked polyacrylate. The mass loss rate after immersion in water From 18.82% without adding to 14.32%, the mass loss rate is still relatively large, and the physical and mechanical properties are poor
[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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  • Compatibilizer of water-swelling nitrile rubber and preparation method of compatibilizer
  • Compatibilizer of water-swelling nitrile rubber and preparation method of compatibilizer
  • Compatibilizer of water-swelling nitrile rubber and preparation method of compatibilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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 graft, 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 is ready for use. Do infrared test, thermogravimetric test.

[0032] 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- stretching vibration peak, 1440cm -1 、968cm -1 is the in-plan...

Embodiment 2

[0049] 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 distilled water precipitated the graft, and then washed it several times with a large amount of distilled water, dried it in a vacuum oven at room temperature, dried it and extracted it with a mixed solution of ethylene glycol and glacial acetic acid in a Soxhlet extractor. After 12 hours, the compatibilizer was obtained after drying.

[0050] The compatibilizer obtained in Example 2 is applied to water-swellable nitrile rubber, and the specific implementation method is the same as that of Example 1.

[0051] See Table 2 for the formula (consumption in parts by weight) and test results.

[0052] Table 2

[0053]

[0054]

Embodiment 3

[0056] 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 graft, and then, washed several times with a large amount of distilled water, placed it in a vacuum oven and dried at room temperature, dried and extracted with acetone solution in a Soxhlet extractor for 12 hours, and obtained after drying Compatibilizer maleic anhydride grafted nitrile rubber.

[0057] The compatibilizer obtained in Example 3 is applied to water-swellable nitrile rubber, and the specific implementation is the same as in Example 1.

[0058] See Table 3 for the formula (consumption in parts by weight) and test results.

[0059] table 3

[0060]

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Abstract

The invention relates to a compatibilizer of a water-swelling nitrile rubber and a preparation method of the compatibilizer. The preparation method comprises the following steps of: respectively dissolving nitrile rubber, maleic anhydride and an initiator in a solvent, and raising the temperature of a nitrile rubber solution to 55-75 DEG C; slowly adding a mixed solution of the maleic anhydride and the initiator to be subjected to a constant temperature reaction for 8-12h and then discharging; adding a precipitating agent to separate a graft product of the nitrile rubber and the maleic anhydride, and washing the product with distilled water; drying and cutting the washed graft product into pieces, and removing the initiator, the maleic anhydride and a maleic anhydride homopolymer by extraction; and drying to obtain the compatibilizer of 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, the mass loss rate of the water-absorbent resin is reduced, and 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 compatibilizer for water-absorbing 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 has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L51/04C08F279/02
Inventor 杨隽姚棋郭雅妮谢浩徐黎刚闫霜
Owner WUHAN INSTITUTE OF TECHNOLOGY
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