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Method for modifying surface of high molecular weight polyethylene powder through interfacial polycondensation

A technology of ultra-high molecular weight and polyethylene powder, applied in the field of polymer surface modification, can solve the problem of low physical mixing efficiency, achieve the effect of improving surface hydrophilicity, good treatment effect, and increased bond strength

Active Publication Date: 2011-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the physical mixing method is used, the efficiency of physical mixing is not high, and phase separation often occurs in the mixed system; when using methods such as irradiation activation grafting and surface free radical grafting reaction, the surface-grafted UHMWPE often has Timeliness, that is, after a period of time, due to the reconstruction of polymer chains, the surface returns to chemical inertness

Method used

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  • Method for modifying surface of high molecular weight polyethylene powder through interfacial polycondensation
  • Method for modifying surface of high molecular weight polyethylene powder through interfacial polycondensation
  • Method for modifying surface of high molecular weight polyethylene powder through interfacial polycondensation

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Experimental program
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Effect test

Embodiment 1

[0045] In this example, the pretreatment process of step 1 is completely consistent with that of the comparative example, the difference is that the UHMWPE powder after pretreatment is subjected to surface modification treatment using the process described in steps 2 to 6, and the specific steps are as follows:

[0046] Step 1: Pre-treatment of UHMWPE powder: Use a 200-mesh sieve to screen out UHMWPE powder with a relatively uniform particle size. The relative molecular weight of the UHMWPE powder is 2 million; then soak the UHMWPE powder in acetone, wash it ultrasonically for 0.5 hours, and remove it by suction filtration Acetone, and then placed in a vacuum oven with a vacuum degree of 0.1Mpa, vacuum-dried at 30°C for 12 hours, and took out the UHMWPE powder for use after drying;

[0047] Step 2: Prepare solution A: Dissolve isophthaloyl dichloride in n-hexane to prepare isophthaloyl dichloride n-hexane solution with a concentration of 0.05g / mL;

[0048] Step 3: Adding to so...

Embodiment 2

[0054] Steps 1 to 4: are identical to steps 1 to 4 in Example 1;

[0055] Step 5: After the UHMWPE powder mixed solution obtained in step 3 is suction-filtered, the solvent is not removed, and the solvent is directly stirred into the melamine aqueous solution prepared in step 4 at one time, and stirred and reacted at a speed of 2600 rpm for 40 minutes;

[0056] Step 6: Filter the mixed solution obtained in Step 5 to remove the solvent, wash with deionized water and acetone three times respectively, and then place it in a vacuum oven with a vacuum degree of 0.1Mpa at 50°C for 4 hours to obtain UHMWPE powder Take it out and set aside.

[0057] The dispersion situation of the UHMWPE powder that above-mentioned method obtains in water is as follows image 3 As shown, it can be seen that the dispersibility of UHMWPE powder in water is enhanced, and it can be uniformly dispersed in water instead of floating on the water surface.

Embodiment 3

[0059] Steps 1 to 4: are identical to steps 1 to 4 in Example 1;

[0060] Step 5: After the UHMWPE powder mixed solution obtained in step 3 is suction-filtered, the solvent is not removed, and the solvent is directly stirred into the triethylenediamine aqueous solution prepared in step 4 at one time, and stirred and reacted at a speed of 2600 rpm for 5 minutes;

[0061] Step 6: Filter the mixed solution obtained in Step 5 to remove the solvent, wash with deionized water and acetone three times respectively, and then place it in a vacuum oven with a vacuum degree of 0.1Mpa at 50°C for 4 hours to obtain UHMWPE powder Take it out and set aside.

[0062] The UHMWPE powder obtained by the above method has enhanced dispersibility in water and can be evenly dispersed in water instead of floating on the water surface.

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Abstract

The invention discloses a method for modifying the surface of high molecular weight polyethylene powder through interfacial polycondensation. The method comprises the following steps of: soaking ultra-high molecular weight polyethylene (UHMWPE) powder in a reaction monomer solution containing two or more than two acyl chloride groups or isocyanate groups; and adding into a reaction monomer solution containing two or more than two amino groups and hydroxyl groups, stirring and dispersing, and obtaining a layer of polyurea and / or polyurethane and / or polyamide film on the surface of the ultra-high molecular weight polyethylene powder through the interfacial polycondensation, so that the compatibility and adhesion of the surface of the UHMWPE powder are effectively improved and the performance of the UHMWPE powder is not changed. In addition, the method for modifying the surface of the UHMWPE powder is easy to implement, high in treatment speed and good in treatment effect, has low requirement on equipment, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of polymer surface modification, in particular to a method for modifying the surface of ultra-high molecular weight polyethylene by interfacial polycondensation, aiming at improving the compatibility and bonding performance of the surface of ultra-high molecular weight polyethylene powder. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene material with an average molecular weight of more than one million. Its molecular chain is a linear structure and has excellent wear resistance, ultra-high modulus, high toughness, self-lubrication, Environmental stress cracking, chemical stability, fatigue resistance, small friction coefficient and other advantages. [0003] UHMWPE is usually synthesized by slurry method, and UHMWPE powder is obtained by low-pressure batch polymerization under the action of Zieglar-Natta catalyst. UHMWPE powder can be processed into various ...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08L23/06
Inventor 胡伟炜乌学东戴丹顾群曾志祥
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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