CN-122006998-A - Surface treatment method of ultra-high molecular weight polyethylene

Abstract

A surface treatment method of ultra-high molecular weight polyethylene belongs to the technical field of ultra-high molecular weight polyethylene surface treatment. The invention provides a surface treatment method of ultra-high molecular weight polyethylene, which comprises the steps of wiping the surface of the ultra-high molecular weight polyethylene by adopting ethanol, performing flame treatment, coating a primer treatment agent, and drying. The invention can simply and quickly finish the surface modification of UHMWPE, and realizes the strong adhesion of paint and UHMWPE.

Inventors

• ZHANG JIAFEI
• XIE XIAOJUN
• ZHANG XINLONG
• ZHANG HONG
• ZHAO LUFENG
• LIN WENSONG
• SHEN SHIJIE
• WANG BOLONG

Assignees

• 浙江立泰复合材料股份有限公司

Dates

Publication Date

20260512

Application Date

20260312

Claims (10)

1. 1. A surface treatment method of ultra-high molecular weight polyethylene, characterized by comprising the following steps: wiping the surface of the ultra-high molecular weight polyethylene with ethanol, performing flame treatment, coating with a primer treatment agent, and drying; The flame treatment condition is that the speed is 10-50cm/s, the distance between the flame and the surface of the ultra-high molecular polyethylene is 10-30mm, the temperature of the surface of the ultra-high molecular polyethylene is 40-50 ℃ and the flame temperature is 300-500 ℃.
2. 2. A surface treatment method of ultra high molecular weight polyethylene according to claim 1, wherein the number of wiping is 2 to 3; the primer coating treating agent is an adhesion promoter.
3. 3. A surface treatment method of ultra high molecular weight polyethylene according to claim 1, wherein a mixture of fuel gas and air in the flame treatment is used as flame gas.
4. 4. The method for surface treatment of ultra high molecular weight polyethylene according to claim 1, wherein the fuel gas is at least one of methane, propane or butane.
5. 5. A surface treatment method of ultra-high molecular weight polyethylene according to claim 3, wherein the control air flow rate at the time of flame treatment is 32.5 to 34.0 times the fuel gas flow rate.
6. 6. The method for surface treatment of ultra-high molecular weight polyethylene according to claim 2, wherein the adhesion promoter is at least one of DH-7208A, CP-7540, NA-1100, maleic anhydride grafted polyethylene, acrylate grafted polyethylene, ethylene-acrylic acid copolymer.
7. 7. A method of surface treatment of ultra high molecular weight polyethylene according to claim 1, wherein said ethanol is replaced with a complex wipe; the composite wiping solution comprises, by mass, 85-92 parts of absolute ethyl alcohol, 6-12 parts of an ethanol-soluble difunctional weakly-reactive silane coupling agent and 2-3 parts of deionized water; the ethanol-soluble difunctional weak-reactivity silane coupling agent is gamma-methacryloxypropyl trimethoxy silane, vinyl triethoxy silane, bis- (3- (triethoxy silicon) -propyl) tetrasulfide, gamma-aminopropyl triethoxy silane and bis- (3- (triethoxy silicon) -propyl) tetrasulfide.
8. 8. Modified ultra-high molecular weight polyethylene, characterized by being obtained by the surface treatment method according to any one of claims 1 to 7.
9. 9. An ultra-high molecular weight polyethylene composite article obtained by coating the surface of the ultra-high molecular weight polyethylene according to claim 8 with a coating material.
10. 10. The ultra high molecular weight polyethylene composite article according to claim 9, wherein said coating is a primer and/or a topcoat.

Description

Surface treatment method of ultra-high molecular weight polyethylene Technical Field The invention belongs to the technical field of ultrahigh molecular weight polyethylene surface treatment, and particularly relates to an ultrahigh molecular weight polyethylene surface modification method by combining ethanol treatment and simple flame treatment. Background The ultra-high molecular weight polyethylene (UHMWPE) is polyethylene with the relative molecular weight of more than 150 multiplied by 10 4, and is a novel engineering plastic. The UHMWPE with the average relative molecular weight of 200 multiplied by 10 4 has the density of only 0.935g/cm 3, so that the product has the characteristic of light weight. The ultra-high molecular weight polyethylene has various excellent properties such as wear resistance, corrosion resistance, impact resistance, self-lubrication, small friction factor, low water absorption, difficult adhesion of foreign matters, sanitation, no toxicity, recycling, low temperature resistance and the like, and particularly has outstanding wear resistance. However, the ultra-high molecular weight polyethylene product has the characteristics of strong surface inertia, low surface energy and strong surface non-polarity, so that the adhesion between the ultra-high molecular weight polyethylene product and other substances is poor, the ultra-high molecular weight polyethylene product is not easy to adhere to surface finishing products such as paint, and the ultra-high molecular weight polyethylene product is extremely easy to fall off after the surface is painted, which severely limits the further application of the ultra-high molecular weight polyethylene. In order to solve the problem of poor adhesion of the surface of UHMWPE products, people carry out surface modification treatment on the UHMWPE, and common methods include chemical reagent treatment, low-temperature plasma treatment, corona treatment, flame treatment and the like. The modification method of the chemical reagent treatment is to oxidize and chemically etch the surface of UHMWPE by strong acid and alkali to increase the polarity and roughness of the surface so as to increase the surface adhesion, but the method can generate a large amount of waste liquid, which is not environment-friendly. The low temperature plasma treatment method is that ionized gas produced by low pressure discharge, free electrons in the gas obtain energy to become high energy electrons under the action of a power plant, the high energy electrons act on the surface of UHMWPE, chemical reaction can occur, a large amount of epoxy groups are introduced to change the surface activity of the UHMWPE, but the method has high equipment requirement and high treatment cost. The corona treatment method is that high-frequency and high-voltage electrodes are used for discharging to generate a large amount of plasmas and ozone, which directly or indirectly act on the surface of UHMWPE, so that molecular chains on the surface of UHMWPE generate polar groups such as carbonyl groups and nitrogen-containing groups, and the surface of UHMWPE is roughened to achieve the purpose of modification. However, after corona treatment, the molecular chain segments on the surface of the material gradually move, so that the introduced polar groups are turned into the material, the surface energy is reduced, and the material has certain timeliness. The flame treatment method is that the mixed gas with a special proportion is ignited on a lamp cap to directly contact with the surface of UHMWPE, and oxidation reaction is carried out under the action of high temperature, and polar groups are introduced into the surface of UHMWPE, thus achieving the purpose of modification. However, the flame treatment adopted in the prior art has extremely high requirements on flame intensity (such as the temperature of 800-1100 ℃), gas type (such as the volume ratio of combustible gas to combustion supporting gas controlled at 1:10-1:15), contact distance and time between the flame and the surface of UHMWPE (such as the distance of 50-100 mm, the treatment speed of 1.5 m/s), and the like, the operation process is very strict, insufficient oxidation is caused due to insufficient temperature or the substrate is molten, deformed and carbonized due to over high temperature, and the method cannot be used. In order to solve the problem of the surface adhesion of the ultra-high molecular weight polyethylene fiber composite material, a plurality of prior art are disclosed. For example, CN117107513A discloses a method for modifying the surface of ultra-high molecular weight polyethylene fiber. The method comprises two steps of plasma pretreatment and active monomer grafting. Firstly, carrying out plasma surface treatment on ultra-high molecular weight polyethylene fibers to generate active free radicals, and then adding the pretreated fibers into an active reaction system to carry out active monomer grafting, there