Reaction liquid for modifying polymer film and modifying method

A technology of polymer film and reaction solution, which is applied in the field of reaction solution with high hydrophilicity modification on the surface of polymer film, can solve the problems of complicated post-processing, difficult grafting and uniformity, etc., and achieve the effect of simple and easy processing procedure

Active Publication Date: 2005-08-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0013] In order to overcome the shortcomings of the existing ultraviolet light-induced surface grafting technology that needs to achieve a relatively high grafting rate to obtain a relatively satisfactory treatment effect, the grafting is not easy to be uniform, and the post-treatment is complicated, the present invention provides a method for surface modification of polymer films. properties to obtain a highly hydrophilic reaction solution, this composition is used in the UV-induced grafting process, the solvent is a poor solvent for grafted polymers and homopolymers, and when the grafting reaction is carried out to a certain extent, the generated The homopolymer is precipitated from the system, the system changes from homogeneous phase to heterogeneous phase, the molecular chain of the graft is in a contracted state, and the grafting rate of the polymer film base material is low but the grafting is uniform (see figure 1 , 3 , 5), a better modification effect can be obtained, the homopolymer has low adhesion firmness, and the post-processing procedure can be simplified

Method used

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  • Reaction liquid for modifying polymer film and modifying method
  • Reaction liquid for modifying polymer film and modifying method
  • Reaction liquid for modifying polymer film and modifying method

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The hydrogen abstraction photoinitiator benzophenone is dissolved in ethanol, the polar monomer acrylamide is dissolved in water, and then the above two are mixed to form a reaction solution. The concentration of the polar monomer in the reaction solution is 25wt%. The concentration of the hydrogen abstraction initiator is 0.8wt%, and the ratio of ethanol / water in the mixed solvent is 1:1wt%. Apply the prepared reaction solution evenly on the biaxially oriented polypropylene (BOPP) film with a coating wire rod, and the coating amount is 15g / m 2 , covered with a 0.1 mm thick polyethylene film, and then placed under a 1000W high-pressure mercury lamp for 20 seconds. The distance between the BOPP film to be treated and the 1000W high-pressure mercury lamp is 20cm, and the light intensity is 65W / m 2 (λ=365nm). The cover film and the treatment film were separated, and the treatment film was washed with water and dried. Measure the graft rate of the treated BOPP film to be...

Embodiment 2

[0053] The method for preparing hydroxyethyl acrylate and thioxanthone butanol, water (butanol / water is 2: 1wt%) mixed solution according to the method of Example 1, the polar monomer concentration in the reaction solution is 23wt%, hydrogen abstraction type The initiator concentration was 2.3 wt%. Use a coating wire rod to evenly coat the prepared reaction solution on a polyethylene terephthalate (PET) film (without a cover film), and the coating amount is 10g / m 2 , and then placed under a 1000W high-pressure mercury lamp for 20 seconds. The distance between the PET film to be treated and the high-pressure mercury lamp is 25cm, and the light intensity is 59W / m 2 (λ = 365 nm), the treated membrane was washed with water and dried. Determination of the grafting rate of the treated PET film is 0.1%, 5 × 5cm 2 The water contact angle of 10 test points on the film surface was 22±1 degree, and the surface water contact angle did not change after the treated surface was exposed to...

Embodiment 3

[0055] The method for preparing N-vinylpyrrolidone and benzophenone in acetone, water (acetone / water is 3: 2wt%) mixed solution according to the method of Example 1, the concentration of polar monomers in the reaction solution is 15wt%, hydrogen abstraction type trigger The agent concentration is 0.75wt%. Adopt the coated wire bar to evenly coat the prepared reaction solution on the polyethylene terephthalate (PET) film, and the coating amount is 12g / m 2 , covered with a 0.02 mm thick biaxially oriented polypropylene film, and then irradiated under a 20W low-pressure mercury lamp for 1 minute. The distance between the PET film to be treated and the low-pressure mercury lamp is 1cm, and the light intensity is 10W / m 2 (λ=254nm). The cover film and the treatment film were separated, and the treatment film was washed with water and dried. Determination of the graft rate of the treated PET film is 0.18%, 5 × 5cm 2 The water contact angle of 10 test points on the film surface wa...

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Abstract

The present invention provides reaction solution and modification method for modifying polymer film, especially raising the surface hydrophilicity of the polymer film. The reaction solution includes acrylic acid and its derivative, acrylamide and its derivative, acrylate, N-vinyl pyrrolidone, acrylonitrile or other polar monomer; dibenzophenone, thioanthrone and its derivative, anthraquinone and other hydrogen accepting light initiator; and mixed solvent comprising and organic solvent. During ultraviolet grafting treatment, the film to be treated is painted with the prepared reaction solution, irradiated with ultraviolet ray, washed and dried to become polymer film with high hydrophilicity. The said process has the advantages of long modification effect, simple post-treatment, etc.

Description

Technical field: [0001] The present invention relates to a reaction solution for high-hydrophilicity modification on the surface of polymer film, and also relates to a method for high-hydrophilization modification on the surface of polymer film. Graft polymerization of monomers is a modification method for obtaining high hydrophilicity. Background technique: [0002] Plastic films are widely used in today's society. The surface properties of organic polymer materials play a vital role in determining their end use, but due to their chemical structure, there are generally problems with low surface energy and poor hydrophilicity. , resulting in difficulty in printing, bonding, dyeing, and wetting by polar solvents such as water, etc., which are not suitable for certain application requirements. The evaluation of surface hydrophilicity is usually indicated by the contact angle formed by water and the surface of the material: the smaller the contact angle, the better the hydroph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J7/16C08L23/02
Inventor 杨万泰孙玉凤刘莲英
Owner BEIJING UNIV OF CHEM TECH
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