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Composite structure of low surface energy polymer material with high cohesiveness and preparation method thereof

A polymer material and low surface energy technology, applied in the direction of coating, etc., can solve the problems of difficult bonding of formed materials, insufficient radiation safety, and limited bonding strength, etc., to achieve large-area preparation, fast preparation process, Inexpensive effect

Active Publication Date: 2020-07-14
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) "Laser radiation method", through the radiation of Co-60, styrene, methacrylate, etc. are grafted on the surface of polytetrafluoroethylene, so as to achieve bonding. The durability of this method is also lacking, and the radiation is not enough Safety
Wang Xiaomei and others used bicarbonate, azodicarbonamide, etc. as foaming agents to add to PTFE resin powder. After cold pressing, sintering and other steps, the foaming agent decomposed and released gas, forming micropores to obtain foamed PTFE, making it Become surface-adhesive PTFE; but this method needs to be prepared from tetrafluoroethylene monomer, and it still cannot solve the bonding problem for the bonding of formed polytetrafluoroethylene products
Similarly, another type of PTFE modification method also includes inorganic particle filling modification, adding metal, metal oxide, SiO2, or some rigid fibers as an additive phase to the PTFE resin powder and then cold pressing, Steps such as sintering improve its cohesiveness, and its disadvantages are similar to those of Wang Xiaomei et al. It is difficult to realize the bonding of formed materials
Chinese patent CN201310577812.8 discloses the improvement of the surface adhesion of formed materials. The inventor heats one surface of PTFE above the melting point, and combines the PFA or FEP film with the melting surface of PTFE through an unwinder, and then passes A self-made calender is used to hot-press it with glass fiber cloth to form a PTFE composite board to realize the bonding of PTFE; however, this method requires the use of more complicated equipment, and can only process flat boards of limited size, and the bonding strength is also limited
In addition, Zhang Wenbing and others also use fluorinated acrylate emulsion adhesive to bond PTFE materials, but the adhesive is more toxic and the bonding strength is not satisfactory.

Method used

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  • Composite structure of low surface energy polymer material with high cohesiveness and preparation method thereof
  • Composite structure of low surface energy polymer material with high cohesiveness and preparation method thereof
  • Composite structure of low surface energy polymer material with high cohesiveness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Using modified T-ZnOw to achieve multi-mechanism synergy to achieve adhesion to commercially available PTFE sheets

[0065] Take 1g of T-ZnOw powder and place it in a conical reaction flask, and uniformly disperse it in 200mL Tris-HCl buffer solution with pH=8.5 by ultrasonic; Ethylenepentamine (addition molar ratio is 3:8); maintain the stirring condition of 900r / min, react at room temperature for 24 hours, and use a suction filtration device to remove the modified T-ZnOw (T-ZnOw@Cat-TEPA) in the water phase ) separation; drying at 80°C for 4 hours. Through X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM) observation, the TEM image ( figure 1 ) It can be seen that coating modification has taken place on the surface, XPS figure ( figure 2 ) It can be seen that the surface is modified with amino groups.

[0066] Refer to the relevant documents GB-7124 on the tensile shear strength test of adhesives in the national testing standard sys...

Embodiment 2

[0078] Using modified T-ZnOw to achieve multi-mechanism synergy to achieve adhesion to commercially available PTFE sheets

[0079] Take 1g of T-ZnOw powder and place it in a conical reaction flask, and uniformly disperse it in 200mL of Tris-HCl buffer solution with pH=8 by ultrasonic; Ethylenepentamine (addition molar ratio is 1:2); maintain the stirring condition of 750r / min, react at room temperature for 24 hours, and use a suction filtration device to remove the modified T-ZnOw (T-ZnOw@Cat-TEPA ) separation; drying at 80°C for 4 hours. By observing it with a transmission electron microscope (TEM), the TEM image ( image 3 ) can be seen that the coating modification has occurred on the surface.

[0080] Refer to the relevant documents GB-7124 on the tensile shear strength test of adhesives in the national testing standard system of the People's Republic of China, take a commercially available 2mm thick polytetrafluoroethylene plate without any surface treatment, and cut it...

Embodiment 3

[0086] Using modified T-ZnOw to achieve multi-mechanism synergy to achieve adhesion to commercially available PTFE sheets

[0087] Take 1g of T-ZnOw powder and place it in a conical reaction flask, and disperse it evenly in 200mL deionized water (pH=7) by ultrasonic; add 0.11g catechol, 0.252g tetraethylene Pentaamine (addition molar ratio is 3:4); maintain the stirring condition of 550r / min, react at room temperature for 36 hours, and use a suction filtration device to remove the modified T-ZnOw (T-ZnOw@Cat-TEPA) in the water phase Separation; drying at 80°C for 4 hours. It was observed by a transmission electron microscope (TEM), and the TEM image ( Figure 4 ) can be seen that the coating modification has occurred on the surface.

[0088] Refer to the relevant documents GB-7124 on the tensile shear strength test of adhesives in the national testing standard system of the People's Republic of China, take a commercially available 2mm thick polytetrafluoroethylene plate with...

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Abstract

The invention discloses a high-adhesion low-surface energy polymer material composite structure and a preparation method thereof, the composite structure comprises a low surface energy polymer material device and a surface treating agent layer arranged on the surface of the low surface energy polymer material device. The surface of a low surface energy polymer material to be bonded is coated withthe surface treating agent, the low surface energy polymer material comprising the surface treating agent layer is obtained after heating, and the low surface energy polymer material comprising the surface treating agent layer is bonded with other low surface energy polymer material to be bonded through an adhesive. The method does not involve special surface treatment such as corona or plasma, and has no damage to the material, and the treated surface can be placed for a long time; no solvent is needed in the whole process, high pressure is not involved, the high-adhesion low-surface energy polymer material composite structure is non-toxic, harmless, safe and environment-friendly; reactant price is low, reaction condition is mild, the preparation method is easy to repeat and realize, andthe bonding strength realized by the method can reach several times that of common epoxy resin.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a high cohesive low surface energy macromolecular material composite structure and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE, Teflon) has excellent properties such as acid and alkali resistance, high temperature resistance, solvent resistance and low surface energy due to its unique molecular structure; since its industrial production in 1949, it has been widely used in chemicals, electrical appliances, Machinery, medical and many other fields, known as the "King of Plastics" in the world. [0003] The C-F bond with higher bond energy and the larger atomic radius difference of PTFE material itself bring it excellent aging resistance and excellent chemical stability; however, the industrial processing and molding process of the material will While bringing high crystallinity and low surface energy (that is, showin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/18
Inventor 徐坚余露佳赵宁
Owner INST OF CHEM CHINESE ACAD OF SCI