Hydrophilic modifier for polyethylene films and preparation method thereof

A polyethylene film, hydrophilic technology, applied in the direction of coating, etc., can solve the problems of poor hydrophilicity, limited application field, low surface energy of polyethylene film, etc., to achieve the effect of not easy to be lost, firmly bonded, and improved hydrophilicity Effect

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low surface energy and poor hydrophilic

Method used

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  • Hydrophilic modifier for polyethylene films and preparation method thereof
  • Hydrophilic modifier for polyethylene films and preparation method thereof
  • Hydrophilic modifier for polyethylene films and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The flow process of preparing polyethylene film hydrophilic modifier of the present invention is shown in the following formula:

[0017]

[0018] m:n=37~1:63~99, m+n=19~572, x=5~17, y=7~44

[0019] The hydrophilic modifying agent for polyethylene film prepared by the present invention has a main chain of a random copolymer, and its composition can be controlled by adjusting the feed ratio of long-chain α-olefin and tert-butyl acrylate or changing the polymerization temperature. Controlling the content of the tert-butyl acrylate structural unit in the copolymer also controls the content of polyethylene glycol in the polyethylene film hydrophilic modifier.

Embodiment 1

[0022] Step 1) thoroughly remove oxygen and water in the reactor, 1-octene, tert-butyl acrylate and toluene, add 20 milliliters of toluene, 5.46 gram 1-octene and 2.08 gram tert-butyl acrylate successively, finally add 20 mg of Azodiisobutyronitrile initiates the polymerization. Polymerization was carried out at 80°C for 19 hours to obtain 2.16 g of a tert-butyl acrylate-1-octene copolymer. Proton nuclear magnetic resonance spectrum records that the molar percentage of tert-butyl acrylate structural unit in this copolymer is 74.8%, and the number-average molecular weight that records copolymer with gel chromatography is 7.5 * 10 3 g / mol, molecular weight distribution index 2.2.

[0023] Step 2) Dissolve 2 grams of the above-mentioned copolymer in 60 milliliters of tetrahydrofuran, add 4.35 milliliters of trifluoroacetic acid at room temperature, heat to reflux temperature, and reflux for 48 hours under stirring. The tert-butyl acrylate structural unit is completely hydrolyzed...

Embodiment 2

[0027] Step 1) thoroughly remove oxygen and water in the reactor, 1-octene, tert-butyl acrylate and toluene, add 20 milliliters of toluene, 5.46 grams of 1-octene and 2.08 gram of tert-butyl acrylate successively, finally add 15 mg of Azodiisobutyronitrile initiates the polymerization. Polymerization was carried out at 80°C for 19 hours to obtain 1.88 g of tert-butyl acrylate-1-octene copolymer. The molar percentage of tert-butyl acrylate structural unit in this copolymer is 76.2%, and number average molecular weight is 8.3 * 10 3 g / mol, the molecular weight distribution index is 1.9.

[0028] Step 2) Dissolve 1.8 grams of the above-mentioned copolymer in 60 milliliters of tetrahydrofuran, add 4.35 milliliters of trifluoroacetic acid at room temperature, heat to reflux temperature, and reflux for 48 hours under stirring. Acrylic acid-1-octene copolymer was obtained. The number average molecular weight of the copolymer is 6.1×10 3 g / mol, the molecular weight distribution in...

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Abstract

The invention discloses a hydrophilic modifier for polyethylene films and a preparation method thereof. The invention is characterized by using a long-chain alpha-olefin-tert butyl acrylate copolymer as a matrix and grafting polyethylene glycol with hydroxyl at one terminal onto a copolymer chain through hydrolysis and esterification. Such molecular structures as graft density and branched chain length of the graft copolymer can be effectively controlled through the method. The method is simple in process and convenient to operate. The hydrophilicity of the surfaces of the polyethylene films can be substantially improved by coating the modifier on the surfaces of the polyethylene films, and the modifier is firmly jointed with the polyethylene films and is not easy to run off because of being scoured by water. The hydrophilic modifier can be used for preparing long-acting antifogging polyethylene films.

Description

technical field [0001] The invention relates to the functionalization of polyolefin materials, in particular to a polyethylene film hydrophilic modifier and a preparation method thereof. Background technique [0002] Polyethylene, especially linear low-density polyethylene (LLDPE) is light in weight, excellent in performance and low in price, and is mainly used as various films. However, due to the low surface energy and poor hydrophilicity of polyethylene film, its application field is limited. Therefore, many researchers at home and abroad start from changing the non-polarity of polyethylene film, and carry out hydrophilic modification on it. At present, the hydrophilic modification of polyethylene film can be divided into two categories: bulk modification and surface modification. Bulk modification refers to first modifying the membrane raw material by graft copolymerization or blending, etc., and then forming a membrane. Both the surface and the matrix of the obtained ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F210/14C08F220/18C08J7/04C08L23/08
Inventor 傅智盛范志强刘敏范艳斌徐君庭王齐
Owner ZHEJIANG UNIV
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