CN103013374B - Bionic anti-sticking lyophobic and oleophobic pasting film - Google Patents
Bionic anti-sticking lyophobic and oleophobic pasting film Download PDFInfo
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- CN103013374B CN103013374B CN201210584148.5A CN201210584148A CN103013374B CN 103013374 B CN103013374 B CN 103013374B CN 201210584148 A CN201210584148 A CN 201210584148A CN 103013374 B CN103013374 B CN 103013374B
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Abstract
The invention provides a bionic anti-sticking lyophobic and oleophobic pasting film and belongs to the technical field of a polytetrafluoroethylene product. The surface of a thin film layer is provided with a first-grade convex hull type structure and a second-grade convex hull type structure, wherein each convex hull type structure is formed by convex hull structure units; the bottoms of the convex hull structure units are circular, regularly triangular, regularly quadrilateral or regularly hexagonal; and a convex hull is in a bowl shape, a cylinder shape, a cone shape, a triangular prism shape, a quadrangular shape or a hexagonal prism shape. The bionic anti-sticking lyophobic and oleophobic pasting film can be randomly bent, and is used on an irregular surface to convert a previous hydrophilic and oleophilic surface into a lyophobic and oleophobic surface, so that the bionic anti-sticking lyophobic and oleophobic pasting film can be widely applied to fields including automobiles, kitchen utensils, electronic products and the like.
Description
Technical field
The invention belongs to tetrafluoroethylene product technical field, be specifically related to a kind of bionical antiseized hydrophobic, oleophobic pad pasting.
Background technology
In daily life, because short needs of wiper India-rubber strip life-span are often changed; Sleety weather wheel get rid of mud cause before and after beater or beat-up and bottom of door easily dirty; Electronic product is fallen in water accidentally; Kitchen utensils stick greasy dirt not easy to clean etc. series of problems perplexing us.Tracing it to its cause, is that water droplet and oil droplet and device surface contact angle are less, and device is can not be well hydrophobic, due to oleophobic.
The molecular structural formula of tetrafluoroethylene is (CF2-CF2-) n, it is a kind of nonpolar linear polymeric material of height symmetry, its surface free energy is extremely low, surface elevation hydrophobic, at present, the preparation technology of polytetrafluoroethylene film is relatively ripe, but the contact angle of smooth surface polytetrafluoroethylene film and water is difficult to reach 150 °, thereby realizes the super-hydrophobicity of film.At bionic non-smooth surface, study this field, the patent No. 01226143.2 is pointed out: by bionics principle, at parts surface, distribute regularly and have the structural unite body of certain geometrical shape.But its characteristic dimension is larger, and be one-level non-smooth structure, in practical engineering application, can only play the effect of visbreaking, but anti-adhesion effects be not obvious.Although and after size narrows down to nanometer, can reach very perfectly anti-adhesion effects, nano material is brought a lot of benefits to the mankind simultaneously, it has also brought many potential safety hazards.Nano material is difficult for degraded, and penetrance is strong, and nano material all exists certain threat to environmental and human health impacts.For these problems, the present invention's application low-surface-energy material, special surperficial secondary composite structure builds the environmentally friendly pad pasting with certain characteristic dimension to copy lotus leaf.
Summary of the invention
The object of the invention is on the basis of the low surface free energy of material own, build secondary rough surface structure, be pasted on and needed waterproof, grease proofing workpiece surface, the performance of antiseized hydrophobic, the oleophobic of application pad pasting, keep easy dirty surface cleaning, glass surface dry and comfortable, improve electronic product work-ing life.
The present invention is comprised of thin film layer and adhesive coating, wherein thin film layer surface has first step convex closure type structure and second stage convex closure type structure, convex closure type structure is comprised of convex closure structure unit, and convex closure structure unit bottom is circle, equilateral triangle, square or regular hexagon; Convex closure is bowl type, cylinder shape, pyramid type, triangular prism-shaped, quadrangular type or six prismatics; Thin film layer thickness d
1for 0.1-0.3mm, adhesive coating thickness d
2for 0.01-0.03mm.
Described first step convex closure type structure and second stage convex closure type structure, its structural area occupation rate represents the area sum of convex closure type structural base circumscribed circles at different levels and the ratio of surface of the base body, by following formula, is determined:
Wherein: P
1represent first step convex closure type structural area occupation rate; P
2represent second stage convex closure type structural area occupation rate; L represents the length of side of square process zone; D represent first step convex closure structure unit interval from; D represent second stage convex closure structure unit interval from; R represents circumradius at the bottom of first step convex closure; R represents circumradius at the bottom of the convex closure of the second stage.
At the bottom of the convex closure height H of described first step convex closure type structure and convex closure, circumradius R is 10-100um, and convex closure height H is 5-100um, and H≤R; At the bottom of the convex closure of second stage convex closure type structure, circumradius r is 1-10um, and convex closure height h is 0.5-10um, and h≤r.
Described first step convex closure type structural area occupation rate P
1>=30%, second stage convex closure type structural area occupation rate P
2>=30%.
The described thin film layer surface with first step convex closure type structure and second stage convex closure type structure is formed through mould heat pressure by the teflon resin that adds 6% fluorosurfactant (FS).
Described mould has that by picosecond laser processing machine or femtosecond laser processing machine, processed and non-smooth surface first step convex closure type structure and second stage convex closure type structural correspondence.
Beneficial effect of the present invention mainly contains: the present invention can be applied to have the various configurations of surface of workpiece surface and need waterproof, grease proofing device.Apply the present invention to glass for vehicle window surface, water droplet can roll down smoothly and not leave any vestige when taking away vehicle window surface dirt, make the glass for vehicle window can super-hydrophobic automatic cleaning, thereby can on automotive window, omit windscreen wiper and the trouble having avoided often changing because of short needs of wiper India-rubber strip life-span; Apply the present invention to the forward and backward beater or beat-up of automobile, bottom of door, can improve vehicle body because of sleety weather wheel get rid of mud cause before and after the easy dirty situation of beater or beat-up and bottom of door; Apply the present invention to electronic product surface, can protect it and also can normally work in accidentally falling into water in the situation that; Apply the present invention to kitchen tile, ventilator blade surface, can make it avoid being infected with greasy dirt, thereby greatly reduce the trouble of cleaning.
Generally speaking, the present invention is bending fold arbitrarily, at irregular surface, makes hydrophilic, oil-wetted surface originally be transformed into super-hydrophobic, oleophobic surface, can be widely used in the fields such as automobile, kitchen utensils, electronic product.
Accompanying drawing explanation
Fig. 1 is bowl type secondary convex closure structure pad pasting sectional view
Fig. 2 is that bottom is circular secondary convex closure structure pad pasting vertical view
Fig. 3 is bowl type secondary convex closure cell cube structure side view
Fig. 4 is bowl type secondary convex closure cell cube structure vertical view
Wherein: 1 is the surperficial polytetrafluoroethylene film with secondary convex closure type structure, and 2 is the adhesive coating of polytetrafluoroethylene film smooth layer one side.Circumradius at the bottom of R-first step convex closure, circumradius at the bottom of the convex closure of the r-second stage, the length of side of L-square process zone, the convex closure height of H-first step convex closure type structure, the convex closure height of h-second stage convex closure type structure, d
1-thin film layer thickness, d
2-adhesive coating thickness, D-first step convex closure structure unit interval from, d-second stage convex closure structure unit interval from.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
According to the present invention, require design to have that antiseized function bionics is hydrophobic, the automotive window of oleophobic is exempted from windscreen wiper pad pasting.First need to process hot pressing die, material is burning aluminium, uses femto-second laser on its surface, to carry out a bowl processing for type pit micro forming pattern.First step pit bottom radius of circle is 10 μ m, pit depth is 5 μ m, the distribution density of pit is 100%, according to convex closure structure area ratio/occupancy ratio formula, can be calculated between centers between each structural unit of first step pit is 20 μ m, and on the finished surface that is 1mmx1mm at breadth, the quantity of first step pit cell cube is 2500.Second stage pit bottom radius of circle is 1 μ m, pit depth is 0.5 μ m, the distribution density of pit is 50%, according to convex closure structure area ratio/occupancy ratio formula, can be calculated between centers between each structural unit of second stage pit is 2.5 μ m, and on the finished surface that is 1mmx1mm at breadth, the quantity of second stage pit cell cube is 160000.The teflon resin that adds 6% fluorosurfactant (FS) is carried out to compression molding, and controlling thin film layer thickness is 0.2mm, through cooling, peels off, and obtains having the polytetrafluoroethylene film of non-smooth surface form.Use argon plasma to process the polytetrafluoroethylene film smooth surface of having prepared, increase ptfe surface free energy, obtain modified Teflon film.The seamless tackiness agent of application coating machine coating one deck, bondline thickness is 0.02mm.Water droplet contacts with film surface, and water droplet presents complete spheroidal, and water droplet bottom is very little with the contact surface of film.The macroscopical contact angle that uses contact angle measurement to measure film and water reaches 168 °-170 °, and roll angle reaches 2 °, and film slightly tilts, and water droplet just can be at the surperficial Free-rolling of film.
Automotive window by requirement processing of the present invention is exempted from windscreen wiper pad pasting, guaranteeing under the prerequisite of driver's seat, water droplet drippage glass for vehicle window surface, when taking away surface dirt, can tumble completely and leave no trace, thereby can omit the installation of vehicle wiper, avoid the variety of issue being caused by wiper, guaranteed driving safety, reduced automobile windage and wind is made an uproar.
According to the present invention, require that design has that antiseized function bionics is hydrophobic, the automobile of oleophobic foundry loam pad pasting not.First need to process hot pressing die, material is graphitic cast iron, uses picosecond laser on its surface, to carry out the processing of six prismatic pit micro forming patterns.First step pit bottom regular hexagon circumradius is 80 μ m, pit depth is 50 μ m, the distribution density of pit is 50%, according to convex closure structure area ratio/occupancy ratio formula, can be calculated between centers between each structural unit of first step pit is 200 μ m, and on the finished surface that is 1mmx1mm at breadth, the quantity of pit cell cube is 25.Second stage pit bottom regular hexagon circumradius is 5 μ m, pit depth is 3 μ m, the distribution density of pit is 40%, according to convex closure structure area ratio/occupancy ratio formula, can be calculated between centers between each structural unit of second stage pit is 14 μ m, and on the finished surface that is 1mmx1mm at breadth, the quantity of pit cell cube is 5100.The teflon resin that adds 6% fluorosurfactant (FS) is carried out to compression molding, and controlling thin film layer thickness is 0.3mm, through cooling, peels off, and obtains having the polytetrafluoroethylene film of non-smooth surface form.The polytetrafluoroethylene film smooth surface of having prepared is used to nitrogen plasma treatment, increase ptfe surface free energy, obtain modified Teflon film.The seamless tackiness agent of application coating machine coating one deck, bondline thickness is 0.03mm.Mud contacts with film surface, and mud drop presents complete spheroidal, and mud drop bottom is very little with the contact surface of film.The macroscopical contact angle that uses contact angle measurement to measure film and water reaches 152 °-155 °, and roll angle reaches 3 °, and film slightly tilts, and mud just can be at the surperficial Free-rolling of film.
The automobile of processing by requirement of the present invention is foundry loam pad pasting not, and automobile is when sleety weather travels, because wheel splashing mud can be smooth and easy from bodywork surface landing, and unlikely sticking at bodywork surface, guarantee the clean of vehicle body, thereby the trouble that greatly reduces carwash for car owner has been saved water resources.
Claims (5)
1. a bionical antiseized hydrophobic oleophobic pad pasting, it is characterized in that being formed by thin film layer (1) and adhesive coating (2), wherein thin film layer (1) surface has first step convex closure type structure and second stage convex closure type structure, convex closure type structure is comprised of convex closure structure unit, and the thin film layer surface with first step convex closure type structure and second stage convex closure type structure is formed through mould heat pressure by the teflon resin that adds 6% fluorosurfactant (FS); Convex closure structure unit bottom is circle, equilateral triangle, square or regular hexagon; Convex closure is bowl type, cylinder shape, pyramid type, triangular prism-shaped, quadrangular type or six prismatics; Thin film layer thickness d
1for 0.1-0.3mm, adhesive coating thickness d
2for 0.01-0.03mm.
2. by bionical antiseized hydrophobic oleophobic pad pasting claimed in claim 1, it is characterized in that described first step convex closure type structure and second stage convex closure type structure, its structural area occupation rate represents the area sum of convex closure type structural base circumscribed circles at different levels and the ratio of surface of the base body, by following formula, is determined:
Wherein: P
1represent first step convex closure type structural area occupation rate; P
2represent second stage convex closure type structural area occupation rate; L represents the length of side of square process zone; D represent first step convex closure structure unit interval from; D represent second stage convex closure structure unit interval from; R represents circumradius at the bottom of first step convex closure; R represents circumradius at the bottom of the convex closure of the second stage.
3. by bionical antiseized hydrophobic oleophobic pad pasting claimed in claim 1, it is characterized in that at the bottom of the convex closure height H of described first step convex closure type structure and convex closure that circumradius R is 10-100 μ m, convex closure height H is 5-100 μ m, and H≤R; At the bottom of the convex closure of second stage convex closure type structure, circumradius r is 1-10 μ m, and convex closure height h is 0.5-10 μ m, and h≤r.
4. by bionical antiseized hydrophobic oleophobic pad pasting claimed in claim 2, it is characterized in that described first step convex closure type structural area occupation rate P
1>=30%, second stage convex closure type structural area occupation rate P
2>=30%.
5. by bionical antiseized hydrophobic oleophobic pad pasting claimed in claim 1, it is characterized in that described mould has that by picosecond laser processing machine or femtosecond laser processing machine, processed and non-smooth surface first step convex closure type structure and second stage convex closure type structural correspondence.
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