Method for preparing strong acidic ion-exchange fibers

An ion-exchange fiber and strong acid technology, which is applied in the field of nuclear technology applications, can solve the problems of prolonged reaction time, decreased fiber strength, and difficulty in cleaning, and achieves the effects of excellent mechanical properties, environmental protection, and simple post-treatment.

Active Publication Date: 2015-04-08
SHENZHEN QIANHAI ZHONGSHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-irradiation grafting operation process is simple, but due to the unfavorable factors of styrene self-polymerization, it is difficult to clean after grafting, and the strength of the obtained fibers decreases significantly, resulting in a serious decline in product quality
At the same time, in the industrial production of strong acid ion exchange fibers prepared by co-irradiation, the change of ambient temperature has a great influence on the process of co-irradiation grafting, which makes the grafting rate change greatly, especially in the northern regions where the winter temperature is low When the co-irradiation grafting reaction cannot...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Example 1: The preparation steps of this example include:

[0015] 1) Extract the polypropylene fiber with acetone for 8 hours, take it out, put it in an oven and dry it at 60°C until it reaches a constant weight;

[0016] 2) Take 30g of polypropylene fiber after drying in step 1 and vacuum pack it with 60 Co is pre-irradiated, the dose rate is 4012Gy / min, and the irradiation dose is 50kGy;

[0017] 3) Methanol, styrene and DVB are mixed with 900ml of mixed solution as grafting liquid, the volume ratio of the three is 720: 180: 3.6, and nitrogen gas is passed into the grafting liquid for 30 minutes to remove the oxygen in the grafting liquid; Under the protection of nitrogen, the polypropylene fiber pre-irradiated in step 2 was cut into a sealed bag, put into the grafting solution, and reacted at 50°C for 12 hours.

[0018] 4) After the reaction in step 3 is completed, take it out, dry it with a centrifuge, then soak it in methanol for 10 minutes, then dry it with a c...

example 2

[0020] 1) Extract the polypropylene fiber with acetone for 8 hours, take it out, put it in an oven and dry it at 60°C until it reaches a constant weight;

[0021] 2) Take 30g of polypropylene fiber after drying in step 1 and vacuum pack it with 60 Co is pre-irradiated, the dose rate is 4012Gy / min, and the irradiation dose is 40kGy;

[0022] 3) Methanol, styrene and DVB were prepared into a 900ml mixed solution as the grafting solution, the volume ratio of the three was 720:180:3.6, nitrogen gas was passed into the grafting solution for 30 minutes, and the lid was sealed for use; nitrogen protection Next, the polypropylene fiber pre-irradiated in step 2 was cut open and the sealed bag was put into the grafting liquid, and reacted at 40°C for 12 hours.

[0023] 4) After the reaction in step 3 is completed, take it out, dry it with a centrifuge, soak it in methanol for 10 minutes, then dry it with a centrifuge, dry it at 60°C, and weigh 80.8g; finally use dichloroethane Extract...

example 3

[0025] 1) Extract the polypropylene fiber with methanol for 8 hours, take it out, put it in an oven and dry it at 60°C until it reaches a constant weight;

[0026] 2) Take 30g of polypropylene fiber after drying in step 1 and vacuum pack it with 60 Co is pre-irradiated, the dose rate is 4012Gy / min, and the irradiation dose is 60kGy;

[0027] 3) Methanol, styrene and TMPTMA are mixed with 900ml of mixed solution as grafting liquid, the volume ratio of the three is 720: 180: 3.6, nitrogen is passed into the grafting liquid for 30 minutes to remove the oxygen in the grafting liquid; Under the protection of nitrogen, cut the sealed bag of the polypropylene fiber pre-irradiated in step 2, put it into the grafting liquid, and react at 55°C for 12 hours;

[0028] 4) After the reaction in step 3 is completed, take it out, dry it with a centrifuge, soak it in ethanol for 10 minutes, then dry it with a centrifuge, dry it at 60°C, and weigh 98.4g; finally use dichloroethane Extracted f...

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Abstract

The invention provides a method for preparing strong acidic ion-exchange fibers. The method comprises the steps of performing vacuum packaging for polyolefine fibers; pre-irradiating through a radiation source; feeding pre-irradiated polyolefine fibers into a grafting solution under the protection of inert gas to react to obtain a polyolefine fiber grafting copolymer; then sulphonating through chlorosulfonic acid to obtain strong acidic ion-exchange fibers; a cross-linking agent is fed into the grafting solution to enable high mechanical strength and relatively high exchange capacity of the sulphonated fibers. According to the method, the process is simple, the polyolefine fiber grafting copolymer is easily prepared under a low temperature condition; the prepared polyolefine fiber-styrene copolymer is low in styrene autopolymer (less than 2%); the dichloroethane solution of chlorosulfonic acid is treated as a sulphonating agent, so that little chlorosulfonic acid is used, and the post-processing is simple.

Description

Technical field [0001] The invention belongs to the application field of nuclear technology, and relates to a method for preparing strongly acidic ion exchange fibers, especially for preparing copolymers of polyolefin fibers and styrene in a low-temperature environment. Background technique [0002] The graft polymerization of polyolefin fibers can adopt methods such as chemical grafting, radiation grafting and plasma grafting. Chemical grafting usually requires the addition of an initiator. It is difficult to form a uniform initiation point during the reaction, which easily triggers the explosion of olefin monomers, which increases the difficulty of removing comonomers in subsequent processes. Moreover, the strength of the grafted fibers is low, making it difficult to Satisfies the requirements of use; irradiation grafting, especially γ-rays with strong penetrating power, can uniformly form free radicals in larger volume fibers, so that the grafting reaction is uniform on t...

Claims

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Application Information

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IPC IPC(8): D06M14/28D06M13/256B01J39/20D06M101/20
Inventor 张本尚丁光伟朱明星臧会山汪淑娟刘晓李媛媛赵曼冯世业王卫强李龙博周从章
Owner SHENZHEN QIANHAI ZHONGSHENG ENVIRONMENTAL PROTECTION TECH
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