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A kind of preparation method and obtained product of hydrophilic aminated hydrogenated nitrile rubber

A technology of aminated hydrogenated nitrile and nitrile rubber, which is applied in the field of organic polymer compounds to achieve the effect of broadening applications

Active Publication Date: 2017-01-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the hydrophilic novel aminated hydrogenated nitrile rubber prepared by two-step catalytic hydrogenation method to be rarely reported in the literature

Method used

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  • A kind of preparation method and obtained product of hydrophilic aminated hydrogenated nitrile rubber
  • A kind of preparation method and obtained product of hydrophilic aminated hydrogenated nitrile rubber
  • A kind of preparation method and obtained product of hydrophilic aminated hydrogenated nitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: preparation nanometer Rh metal catalyst

[0033] 1. Preparation of RhCl 3 ·3H 2 O aqueous solution

[0034] 263.5mg RhCl 3 ·3H 2 O salt was mixed with 40mL deionized water, and magnetically stirred at room temperature for 12h to obtain RhCl 3 ·3H 2 Aqueous solution of O precursor, that is, liquid A;

[0035] 2. Prepare the hydrazine hydrate solution of sodium hydroxide

[0036] Sodium hydroxide is dissolved in the hydrazine hydrate solution, and magnetically stirred evenly to obtain the hydrazine hydrate solution of sodium hydroxide, namely liquid B. The molar weight of sodium hydroxide is 12mmol, and the mol ratio of sodium hydroxide and hydrazine hydrate is 1:2;

[0037] 3. Mixing of two solutions

[0038] Liquid A was dropped into solution B at 60° C., magnetically stirred for 4 hours, the prepared product was subjected to centrifugal suction filtration, and dried to obtain a black powder, that is, nano-Rh catalyst.

Embodiment 2

[0039] Embodiment 2: the preparation of aminated hydrogenated nitrile rubber

[0040] 1. Mix the 60mg nanometer Rh metal catalyst prepared in Example 1 with nitrile rubber, and ultrasonically mix for 10 minutes; the mass ratio of nanometer Rh metal catalyst to nitrile rubber dry weight is 2%.

[0041] 2. Put the mixed liquid obtained in step 1 into the lining of the reactor, and carry out the first step of catalytic hydrogenation under the conditions of 80°C, 1000r / min, and 4MPa hydrogen pressure, and react for 5.5h;

[0042] 3. The first step catalytic hydrogenation reaction product is centrifuged to remove the black nano-metal Rh catalyst, and the mass fraction is added to the reactant to account for 1% RhCl (PPh 3 ) 3 The catalyst was reacted at 120° C. for 2 hours under 4 MPa hydrogen pressure, and the reaction product was dried: the drying temperature was 50° C., and the drying was done for 12 hours.

[0043] The route of aminated hydrogenated nitrile butadiene rubber p...

Embodiment 3

[0045] The preparation method is the same as in Example 2, except that the reaction times in step 2 are 1h, 2h, 3h, and 4h, respectively.

[0046] The content of amino groups is shown in Table 1, and the results of NMR characterization are shown in figure 2 . Carry out contact angle test to sample, test result is shown in Table 2 and image 3 . image 3 Among them, a~f correspond to amino content of 0%, 12.42%, 21.04%, 33.13%, 40%, 63.3%, respectively.

[0047] Table 1 Effect of reaction time on amino group content

[0048] Reaction time / h 1 2 3 4 5.5 Amino content% 12.42 21.04 33.13 40 63.3

[0049] It can be seen from Table 1 that by controlling the reaction time, aminated hydrogenated nitrile rubber with controllable amino content can be prepared, and the amino content gradually increases with the prolongation of the reaction time.

[0050] Table 2 Effect of amino group content on contact angle

[0051] Amino content% 0 12.42 ...

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Abstract

The invention provides a preparation method for hydrophilic aminated hydrogenated butadiene-acrylonitrile rubber. The method comprises the steps that 1, a nanometer Rh metal catalyst and butadiene-acrylonitrile rubber are mixed and dispersed evenly; 2, mixed liquid obtained in the step 1 is added in a reaction kettle, and first-step catalytic hydrogenation is performed under the hydrogen pressure of 1-5 MPa; 3, a RhCl(PPh3)3 catalyst with the mass fraction of 0.5-2.0% is added in a catalytic hydrogenation reaction product, and reacting is performed for 1-3 h under the hydrogen pressure of 1-5 MPa. The invention further provides the hydrophilic aminated hydrogenated butadiene-acrylonitrile rubber prepared through the preparation method. The prepared aminated hydrogenated butadiene-acrylonitrile rubber has the good hydrophilicity, and the hydrophilicity of the aminated hydrogenated butadiene-acrylonitrile rubber is improved along with increasing of the amino group content; existence of amino groups in the aminated hydrogenated butadiene-acrylonitrile rubber supplies active sites to introduction of organic matter containing carboxyl groups and epoxy groups.

Description

technical field [0001] The invention belongs to the field of organic macromolecular compounds, and in particular relates to a method for preparing hydrophilic nitrile rubber and a product obtained therefrom. Background technique [0002] Nitrile rubber has excellent properties such as high strength and high wear resistance, and is widely used in many fields. However, due to its poor hydrophilicity and hygroscopicity, it has poor surface compatibility with other hydrophilic materials (such as starch). Therefore, the application of nitrile rubber in polymer composites is limited; the existence of a large amount of unsaturated carbon-carbon double bonds in nitrile rubber makes the aging resistance of nitrile rubber decline simultaneously. To exist and improve the hydrophilicity of nitrile rubber, it is necessary to modify nitrile rubber. [0003] At present, the method for improving the hydrophilicity of nitrile rubber mainly contains a blending method. As in 2011, Li Xiaolin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/22C08C19/02
Inventor 岳冬梅李翠张立群梁璐
Owner BEIJING UNIV OF CHEM TECH
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