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Hydrophilic long-chain alpha-olefin branched copolymer and preparation method and usage thereof

A graft copolymer, hydrophilic technology, applied in the field of hydrophilic long-chain α-olefin graft copolymer and its preparation, can solve the problem of weak adhesion, short anti-fogging life, and easy to roll water Beads rinse off etc.

Inactive Publication Date: 2007-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low surface energy of the polyethylene film, the adhesion of the inorganic hydrophilic colloid and the hydrophilic organic compound to the polyethylene film is weak, and it is easy to be washed away by rolling water droplets, resulting in the anti-fog drop of the anti-fog polyethylene film. short life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation steps of the hydrophilic long-chain α-olefin graft copolymer are as follows:

[0018] 1) Homopolymerize with long-chain α-olefin as monomer, and the catalytic system is TiCl 4 / MgCl 2 a mixture of ID-supported spherical catalyst and triisobutylaluminum, diphenyldimethoxysilane, wherein ID is diisobutyl phthalate or di-n-butyl phthalate;

[0019] 2) dissolving the polylong-chain alpha-olefin in toluene, pass nitrogen, add the metered organic peroxide initiator and grafting monomer into the reaction flask, and then quickly raise the temperature to the predetermined grafting reaction temperature, The hydrophilic long-chain α-olefin graft copolymer can be formed by the reaction for a predetermined time.

[0020] The preparation steps of the long-acting anti-fogging agricultural film: the long-chain α-olefin graft copolymer is formulated into a dilute solution, spin-coated on the surface of the low-molecular-weight polyethylene film, and vacuum-dried to obt...

Embodiment 1

[0029] Under the protection of inert gas, 20 grams of anhydrous and oxygen-free n-octene, 0.47 grams of triisobutylaluminum, 0.02 grams of diphenyldimethoxysilicon and 0.03 grams of diphenyldimethoxysilicon were sequentially added to a plastic test tube with a magnetic stirring device. Main catalyst; after 230 minutes of polymerization at 0~2℃, transfer to a refrigerator at 0~5℃ and continue to react for 15 days to obtain 13.585 grams of polyoctene, and the viscosity average molecular weight of polyoctene is 5.18×10 5 g / mol.

[0030] Add 100 ml of toluene to a three-necked flask equipped with a magnetic stirrer and a nitrogen inlet, heat it to 80°C, add 2 grams of polyoctene, stir to fully dissolve it, pass nitrogen for 10 minutes, and then add 2 grams of maleic anhydride and 0.06 g of benzoyl peroxide was reacted for 2 hours to obtain 2.033 g of product. The graft ratio of the grafted product was 1.65%, and the acid value was 18.89 mgKOH / g polymer.

Embodiment 2

[0032] The polyoctene and grafting reaction conditions used in Example 2 were the same as those in Example 1, except that the temperature of the grafting reaction was changed to 100°C. 2.034 g of product were obtained. The graft ratio of the grafted product was 1.70%, and the acid value was 19.57 mgKOH / g polymer.

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Abstract

The invention discloses a hydrophilicity long chain alpha-olefin graft copolymer and preparing method and use thereof. The preparing method includes steps: 1) adding water-free and oxygen-free long chain alpha-olefin, triisobutyl aluminum, diphenyl dimethoxyl silicon and spheric polypropylene catalyst in turn to plastic test tube with magnetic force stirring device under inertia gas protection; after polymerizing, transferring the mixture to refrigerator and obtaining poly(long chain alpha-olefin); 2) adding the poly(long chain alpha-olefin) to three-mouth flask with magnetic force stirring device and nitrogen inlet, adding toluene as solvent, heating and stirring to sufficient dissolve, ventilating nitrogen, adding maleic anhydride and organic peroxide initiator, reacting and obtaining hydrophilicity long chain alpha-olefin graft copolymer. Advantages of the invention are: technique is simple, operation is convenient, polyethylene film basal body is not influenced, processing method id simple, cost is low, hydrophilicity of film surface is good and life of fogdrop resistant is long.

Description

technical field [0001] The present invention relates to a hydrophilic long-chain alpha-olefin graft copolymer and its preparation method and application. Background technique [0002] Since polyethylene (especially low-density polyethylene) is inexpensive, lightweight and easy to process, it is widely used as a covering material for greenhouses and the like. Due to the hydrophobicity of the surface of the polyethylene film, when the surface temperature drops below the dew point temperature of the air in the greenhouse, the moisture in the air will be atomized on the surface of the polyethylene film. The existence of fog droplets on the surface of polyethylene film has an adverse effect on crop production mainly in three aspects: (1) fog droplets cause light scattering and refraction, which reduces the light transmittance of the covering material; (2) fog droplets that condense to a certain weight fall on On the surface of crops, it will lead to increased diseases of leaves,...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F4/34C08J5/18
Inventor 傅智盛范志强左艳梅徐君庭王齐
Owner ZHEJIANG UNIV
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