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Hydrophilic modification method achieving durability of surface of polyolefin material

A technology of hydrophilic modification and surface modification, applied in the coating and other directions, can solve the problems of unfavorable amphiphilic molecule surface implantation, affecting the surface modification effect, loss of amorphous molecular chain, etc., and achieving obvious modification effect. , Improve the effect of surface modification and inhibit the effect of dissolution

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the solvation effect of good solvents such as decahydronaphthalene and xylene, the amorphous molecular chains of polyolefins also tend to dissolve and lose when the surface swells, resulting in low surface swelling and a reduced thickness of the swelling layer, which is not conducive to both. The surface implantation of hydrophilic molecules affects the effect of surface modification

Method used

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  • Hydrophilic modification method achieving durability of surface of polyolefin material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) At 10 kV / m 2 Corona discharge treatment is carried out on the surface of the polyethylene material under certain conditions, and the treatment time is 30 seconds;

[0025] 2) Immerse the polyethylene material treated with corona discharge in step 1) into tetralin for surface swelling, the treatment temperature is 75°C, and the treatment time is 6 hours;

[0026] 3) Immerse the polyethylene material swollen on the surface in step 2) into an aqueous solution containing 6 wt% polyethylene glycol oleate (polyethylene glycol polymerization degree is 4), and treat it at 70°C for 1 hour;

[0027] 4) De-swell the surface of the polyethylene material by vacuum drying, and then wash the surface of the polyethylene material with water to remove the polyethylene glycol oleate physically adsorbed on the surface. After drying, the water contact angle value on the surface of the modified polyethylene was tested by the pendant drop method, and the results are shown in Table 1 below...

Embodiment 2

[0030] 1) At 5kV / m 2 Corona discharge treatment is carried out on the surface of the polyethylene material under certain conditions, and the treatment time is 60 seconds;

[0031] 2) Immerse the polyethylene material treated with corona discharge in step 1) into decahydronaphthalene for surface swelling, the treatment temperature is 65°C, and the treatment time is 4 hours;

[0032] 3) Immerse the surface-swelled polyethylene material in step 2) into an aqueous solution containing 4 wt% polyethylene glycol oleate (polyethylene glycol polymerization degree is 6), and treat it at 60°C for 30 minutes;

[0033] 4) De-swell the surface of the polyethylene material by vacuum drying, and then wash the surface of the polyethylene material with water to remove the polyethylene glycol oleate physically adsorbed on the surface. After drying, the water contact angle value on the surface of the modified polyethylene was tested by the pendant drop method, and the results are shown in Table ...

Embodiment 3

[0036] 1) At 15 kV / m 2 Corona discharge treatment is carried out on the surface of the polyethylene material under certain conditions, and the treatment time is 5 seconds;

[0037] 2) Immerse the polyethylene material treated with corona discharge in step 1) into mineral oil for surface swelling, the treatment temperature is 60°C, and the treatment time is 1 hour;

[0038] 3) Immerse the polyethylene material swollen on the surface in step 2) into an aqueous solution containing 2 wt% polyethylene glycol oleate (polyethylene glycol polymerization degree is 8), and treat it at 75°C for 6 minutes;

[0039] 4) De-swell the surface of the polyethylene material by vacuum drying, and then wash the surface of the polyethylene material with water to remove the polyethylene glycol oleate physically adsorbed on the surface. After drying, the water contact angle value on the surface of the modified polyethylene was tested by the pendant drop method, and the results are shown in Table 1 bel...

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Abstract

The invention relates to a hydrophilic modification method achieving durability of the surface of a polyolefin material. Based on the two-step method process of surface embedding modification, the surface of the polyolefin material is firstly subjected to corona discharge treatment, then the polyolefin material is immersed into an organic solvent to be subjected to surface swelling, and then the polyolefin material is immersed into an aqueous solution of an amphiphilic molecule modifier with double bonds at the hydrophobic end to be subjected to surface modification. The treatment method and process are simple, no complex equipment is needed, the modification effect is remarkable and stable, and the hydrophilic modification method is suitable for industrial-scale surface treatment and especially suitable for industrial-scale surface treatment of polyolefin material based porous separating membranes, fibers and other products with complex or porous surfaces.

Description

technical field [0001] The invention relates to a method for permanently hydrophilic modification of the surface of polyolefin materials, more specifically to a method for persistent hydrophilic modification of the surface of polyethylene, polypropylene and poly-4-methyl-1-pentene materials. Background technique [0002] Polyolefin materials such as polyethylene, polypropylene and poly-4-methyl-1-pentene are the most important thermoplastics, because of their good mechanical properties, processability, corrosion resistance and electrical insulation, they are used in industrial and agricultural production and Widely used in daily life. Polyolefin materials can be conveniently made into various product forms such as injection molding products, profiles, pipes, films, fibers, and porous separation membranes. The molecular chain of polyolefin materials is composed of inert methylene and methyl groups, and has high crystallinity, resulting in the lack of active groups on the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J7/02C08J9/36C08J9/40C08J9/42C08L23/06C08L23/12C08L23/20
CPCC08J7/02C08J7/12C08J7/123C08J9/36C08J9/40C08J9/42C08J2323/20C08J2323/06C08J2323/12
Inventor 孔凡敏黄健江国栋苏豪卢强吴小莲常孟于品华王晓林孔京
Owner CHINA PETROLEUM & CHEM CORP