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Preparation method of modified polypropylene film

A polypropylene film and modification technology, which is applied in chemical instruments and methods, film, film technology, etc., can solve the problem that it is difficult to meet the growing demand for surface multifunctionality, the inability to fully utilize free radicals, and the difficulty in controlling surface reactions, etc. problems, to achieve the effect of easy control of reaction degree, best separation performance and anti-pollution performance, and easy control of reaction conditions

Inactive Publication Date: 2021-05-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above method is widely used, it has the disadvantage that it is difficult to control the surface reaction, and the free radicals cannot be fully utilized. The homopolymerization of monomers is too serious, and an additional step to remove homopolymers is required, which consumes high energy and has a single modification effect. , it is difficult to meet the increasing demand for surface multifunctionality in modern industry

Method used

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  • Preparation method of modified polypropylene film
  • Preparation method of modified polypropylene film
  • Preparation method of modified polypropylene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Immerse the PP film in 40 mL of DMF solution containing 800 mg of dopamine hydrochloride, 0.26 mL of BiBB, 0.3 mL of triethylamine and 200 mL of tris buffer at pH=8.5, stir and react for 24 hours, then take out the PP film, rinse with ethanol and dry to obtain the surface Deposited PP film of dopamine initiator (PP-PDA).

[0027] 2. Immerse the PP film obtained in step 1 into a solution containing 10 mg of cuprous bromide and 60 mg of tris(2-(dimethylamino)ethyl)amine (Me 6 TREN) in 10mL DMSO solution, under the protection of nitrogen, add 1g of hydrophilic monomer HEA, turn on the ultraviolet light, initiate the polymerization reaction with the hydrophilic monomer HEA, take out the PP film after 10h, rinse with ethanol and dry to obtain the surface Modified PP membranes grafted with hydrophilic monomers (PP-HEA).

[0028] The static water contact angle diagram of the modified PP film prepared in this example is shown in figure 1 ,From figure 1 It can be seen that...

Embodiment 2

[0030] 1. Immerse the PP film in 40 mL of DMF solution containing 800 mg of dopamine hydrochloride, 0.26 mL of BiBB, 0.3 mL of triethylamine and 200 mL of tris buffer at pH=8.5, stir and react for 24 hours, then take out the PP film, rinse with ethanol and dry to obtain the surface Deposited PP film of dopamine initiator (PP-PDA).

[0031] 2. Immerse the PP film obtained in step 1 into a solution containing 10 mg of cuprous bromide and 60 mg of tris(2-(dimethylamino)ethyl)amine (Me 6 TREN) in 10mL DMSO solution, under the protection of nitrogen, add 1g of hydrophilic monomer AGA, turn on the ultraviolet light, initiate the polymerization reaction with the hydrophilic monomer AGA, take out the PP film after 10h, rinse with ethanol and dry to obtain the surface Modified PP membranes grafted with hydrophilic monomers (PP-AGA).

[0032] The static water contact angle diagram of the modified PP film prepared in this example is shown in figure 1 ,From figure 1 It can be seen that...

Embodiment 3

[0034] 1. Immerse the PP film in 40 mL of DMF solution containing 800 mg of dopamine hydrochloride, 0.26 mL of BiBB, 0.3 mL of triethylamine and 200 mL of tris buffer with a pH of 8.5. After stirring for 24 hours, take out the PP film, wash it with ethanol and dry it to obtain a surface Deposited PP film of dopamine initiator (PP-PDA).

[0035] 2. Immerse the PP film obtained in step 1 into a solution containing 10 mg of cuprous bromide and 60 mg of tris(2-(dimethylamino)ethyl)amine (Me 6 TREN) in 10mL DMSO solution, under the protection of nitrogen, add 1g of hydrophobic monomer MA, turn on the ultraviolet light, initiate the polymerization reaction with hydrophobic monomer MA, take out the PP film after 10h, rinse with ethanol and dry to obtain the surface grafted Modified PP Membrane (PP-MA) with Hydrophobic Monomer.

[0036] The static water contact angle diagram of the modified PP film prepared in this example is shown in figure 1 ,From figure 1 It can be seen that the...

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Abstract

The invention discloses a preparation method of a modified polypropylene film. According to the method, an active / controllable free radical polymerization technology is adopted, an initiating group is introduced to the surface of a PP film to form an initiator, a polymerization reaction is performed through ultraviolet light initiation and a hydrophilic or hydrophobic monomer, and the method specifically comprises the following steps: firstly, immersing the PP film into a N, N-dimethylformamide solution containing dopamine hydrochloride, 2-bromoisobutyryl bromide, triethylamine and a tris buffer solution with the pH value of 8.5 by utilizing a surface deposition method; preparing a PP film with a dopamine initiator deposited on the surface, immersing the prepared PP film in a dimethyl sulfoxide solution containing cuprous bromide and tris (2-(dimethylamino) ethyl) amine, adding a hydrophilic monomer or a hydrophobic monomer under the protection of nitrogen, and carrying out ultraviolet irradiation and initiating polymerization reaction to obtain the modified PP film. The method effectively improves or reduces the surface hydrophilicity and flux of the membrane, inhibits membrane pollution, and has better separation performance and anti-pollution performance than a pure polypropylene membrane.

Description

technical field [0001] The invention belongs to the technical field of surface modification of polymer film materials, and relates to a preparation method of a modified polypropylene film, in particular to a polymer graft modification on the surface of a polypropylene film by controlled free radical polymerization based on ultraviolet light regulation. sexual method. Background technique [0002] In membrane separation technology, the surface properties and structure of membrane materials greatly affect the application performance of materials. For most polyolefin polymers, their surface chemical inertness is relatively strong, and they often perform poorly in terms of hydrophilicity, biocompatibility, dyeability, and binding properties, which limits their further applications. [0003] Polypropylene (PP) has excellent chemical stability and thermal stability, as well as good film-forming properties, and is easy to control the pore size and distribution of the membrane. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/26B01D69/02B01D67/00
CPCB01D71/82B01D71/26B01D69/02B01D67/009B01D67/0093B01D2323/345
Inventor 张强李安琪
Owner NANJING UNIV OF SCI & TECH
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