1. The preparation method of the polypropylene film is characterized by comprising the following steps:

step one, longitudinally unfolding and flattening a polypropylene film;

coating modifying agents on two end faces of the polypropylene film;

irradiating the polypropylene film coated with the modifying agent by using ultraviolet light;

step four, cleaning the irradiated polypropylene film;

the preparation method also uses a polypropylene film preparation device, which comprises a frame (11), two support rods (12) fixedly connected on the frame (11), and two cladding pieces containing transparent materials and slidably connected on the two support rods (12); the two wrapping pieces can wrap the polypropylene film coated with the modifying agent.

2. The manufacturing method according to claim 1, wherein the cladding member comprises quartz glass (21) and a connecting portion (23) fixed on the upper portion of the quartz glass (21), and the connecting portion (23) is slidably connected with the two support rods (12).

3. The preparation method according to claim 2, further comprising an electric push rod (13) for adjusting the distance between the two cladding members, wherein the electric push rod (13) is connected with the cladding members through a buffer member (14).

4. The preparation method according to claim 3, wherein the buffer member (14) comprises a spring (14a) and connecting rings (14b) fixedly connected to two ends of the spring (14a), and the connecting rings (14b) are used for fixedly connecting with a movable end or a connecting portion (23) of the electric push rod (13).

5. The preparation method according to claim 4, wherein the preparation device further comprises a recovery tank (51), a liquid guide plate (52) fixedly connected to the upper part of the recovery tank (51), a movable guide plate (54) capable of swinging around a virtual axis in the recovery tank (51), and a partition plate (55) dividing the recovery tank (51) into two areas, the liquid guide plate (52) firstly receives the liquid and guides the liquid onto the movable guide plate (54), and the movable guide plate (54) can guide the liquid into one of the areas.

6. The preparation method according to claim 5, wherein the preparation device further comprises a stand (61), a connecting plate (71) capable of adjusting the height of the stand (61) through screw transmission, a motor III (72) fixedly connected to the connecting plate (71), a frustum (73) driven to rotate through the motor III (72), and a disc (81) rotatably connected to the stand (61) and arranged right below the frustum (73); wherein the diameter of the frustum (73) is shortened from top to bottom.

7. Preparation method according to claim 6, the preparation device further comprising two positioning elements (84) arranged on the disc (81) and capable of adjusting the spacing by means of a screw drive.

8. The manufacturing method according to claim 7, said manufacturing apparatus further comprising a cylindrical portion (85) integrally connected to both ends of the positioning member (84).

9. The polypropylene film produced by the production method according to any one of claims 1 to 8, characterized in that: wherein the polypropylene film is coated with a compound quaternary ammonium salt modifier.

10. Use of a polypropylene film according to claim 9, characterized in that: the application in printed matter packaging.

Background

For example, the publication number 212332060U discloses a tough polypropylene film, which relates to the technical field of polypropylene films and comprises an outer polypropylene film layer and an inner polypropylene film layer, and is characterized in that a toughness enhancement layer is arranged between the outer polypropylene film layer and the inner polypropylene film layer, and the toughness enhancement layer is sequentially provided with a nylon film layer, a polycarbonate film layer and a polyvinylidene chloride film layer from outside to inside; the nylon film layer is a very tough film, is non-toxic and odorless, has good transparency and luster, is not easy to accumulate static electricity, and can improve the toughness and improve the antistatic effect; the polycarbonate film layer has very outstanding impact strength, excellent aroma retention, good air tightness and moisture resistance, better ultraviolet transmission resistance, and good oil resistance, heat resistance and cold resistance; but the multilayer structure of the polypropylene film is thicker and heavier than the polypropylene film processed by the modifier.

Disclosure of Invention

The invention provides a polypropylene film, a preparation method and application of the polypropylene film, and aims to provide a light and thin modified polypropylene film.

The above purpose is realized by the following technical scheme:

the preparation method of the polypropylene film is characterized by comprising the following steps:

step one, longitudinally unfolding and flattening a polypropylene film;

coating modifying agents on two end faces of the polypropylene film;

irradiating the polypropylene film coated with the modifying agent by using ultraviolet light;

step four, cleaning the irradiated polypropylene film;

the preparation method also uses a polypropylene film preparation device, wherein the preparation device comprises a rack, two support rods fixedly connected to the rack, and two cladding pieces containing transparent materials and slidably connected to the two support rods; the two wrapping pieces can wrap the polypropylene film coated with the modifying agent.

The cladding piece comprises quartz glass and a connecting part fixedly connected to the upper part of the quartz glass, and the connecting part is connected with the two supporting rods in a sliding mode.

The device is characterized by further comprising an electric push rod for adjusting the distance between the two cladding pieces, and the electric push rod is connected with the cladding pieces through a buffer piece.

The buffer piece comprises a spring and connecting rings fixedly connected to two ends of the spring, and the connecting rings are fixedly connected with the movable end or the connecting portion of the electric push rod.

The polypropylene film prepared by the preparation method is coated with the compound quaternary ammonium salt modifier.

The application of the polypropylene film is the application of outer packaging of printed matters.

The preparation method of the polypropylene film has the beneficial effects that:

the two vertically arranged quartz glasses are close to each other, and the modifier is injected between the two quartz glasses, so that the retention effect of the modifier on the polypropylene film is increased, and the light and thin modified polypropylene film is provided. The buffer piece is matched with the flexible pad to enable the two pieces of quartz glass to be soft in stress when being close to each other, and the two pieces of quartz glass are prevented from being broken. And then, through ultraviolet irradiation, ultraviolet light penetrates through the two quartz glasses, the modifier and the polypropylene film are subjected to photocatalytic oxidation, and modification and cleaning are carried out at the same position, so that the processing efficiency of processing the polypropylene film by using the modifier is improved.

Drawings

FIG. 1 shows a quartz glass with its regulating parts in a perspective view;

fig. 2 shows a buffer in a perspective view;

FIG. 3 shows in perspective the quartz glass, the edge casing, the connection portion, the flexible mat and the liquid inlet tank;

FIG. 4 shows the liquid inlet tank in a perspective view;

FIG. 5 shows a drainage pocket in perspective view;

FIG. 6 shows the ultraviolet lamp in perspective view;

FIG. 7 shows the recovery tank in perspective view;

FIG. 8 shows a recovery tank in cross-section;

FIG. 9 shows a gantry in perspective view;

FIG. 10 shows a frustum in perspective view;

FIG. 11 shows the disc in perspective view;

fig. 12 shows the overall structure in perspective view.

Detailed Description

The preparation method of the polypropylene film comprises the following steps:

firstly, longitudinally pulling out a coiled polypropylene film, flattening and unfolding the coiled polypropylene film for fixing;

step two, coating the unfolded part of the polypropylene film by using a modifying reagent;

step three, carrying out photocatalytic oxidation on the coating part of the polypropylene film;

and step four, cleaning the photocatalytic oxidation part coated with the polypropylene film.

The above method also uses a polypropylene film-making apparatus, referring to fig. 1, which includes a frame 11, a support bar 12, an electric push rod 13, a buffer 14, and a wrapping member, the frame 11 including a horizontal portion at the top, and a vertical part I integrally connected with both ends of the horizontal part, the lower end of the middle part of the horizontal part is also integrally connected with a vertical part II, the vertical part II and the vertical part I positioned at the rear side are fixedly connected with two supporting rods 12, the front end of the vertical part II is fixedly connected with an electric push rod 13, the movable end of the electric push rod 13 passes through the vertical part II from front to back, the vertical part I positioned at the rear side is fixedly connected with the electric push rod 13, the movable end of the electric push rod 13 passes through the vertical part I positioned at the rear side from the rear to the front, the movable ends of the two electric push rods 13 are positioned between the two support rods 12, and the inner ends of the movable ends of the electric push rods 13 are fixedly connected with a buffer 14 respectively. Referring to fig. 2, the buffer 14 includes a spring 14a and a connecting ring 14b, two ends of the spring 14a are fixedly connected to the connecting ring 14b, and one of the connecting rings 14b is fixedly connected to the movable end of the corresponding electric push rod 13. Referring to fig. 3, the cladding member includes a quartz glass 21, a side shell 22, a connecting portion 23, a flexible pad 24 and a liquid inlet groove 25, the side end of the quartz glass 21 is fixedly connected to the side shell 22, the side shell 22 protrudes out of the quartz glass 21, the middle portion of the upper end of the side shell 22 is fixedly connected to the connecting portion 23, the vertical portion of the rear end of the side shell 22 and the horizontal portion of the lower side are fixedly connected to the flexible pad 24, the left and right sides of the rear end of the upper portion of the side shell 22 are respectively provided with one liquid inlet groove 25, the front and rear sides of the cladding member are symmetrically provided with two cladding members, one side of one cladding member close to the other cladding member is an inner side, the liquid inlet grooves 25 contained in the two cladding members are both arranged inward, when the two side shells 22 are attached, a certain gap is formed between the two quartz glasses 21, the liquid inlet grooves 25 at the front and rear sides can be connected, liquid can be added into the liquid inlet grooves 25, and the liquid can be filled into the gap between the two quartz glasses 21, the two flexible pads 24 fit together to prevent leakage. The other connecting ring 14b which is not fixedly connected with the movable end of the electric push rod 13 is fixedly connected with the corresponding connecting part 23.

Smooth the expansion of polypropylene film and arrange in between two quartz glass 21, start two electric putter 13, two electric putter 13 drive two bolster 14 respectively and draw close, two bolster 14 drive two connecting portion 23 respectively and are close to in step, two connecting portion 23 drive two quartz glass 21 respectively and are close to in step, and then two quartz glass 21 are close to the laminating, the inboard flexible pad 24 of two quartz glass 21 laminates mutually, pour into the modifier into between to two quartz glass 21 through going into cistern 25 afterwards, in order to increase the effect of being detained. The buffer 14 cooperates with the flexible pad 24 to make the two quartz glasses 21 soft to avoid breaking when approaching. Subsequently, the modifier and the polypropylene film are subjected to photocatalytic oxidation by ultraviolet irradiation through two quartz glasses 21.

The preparation device further comprises a support frame 31, mounting seats 32, a liquid guiding pocket 33 and flat ports 34, wherein the support frame 31 is fixedly connected to the upper end of the frame 11, the mounting seats 32 are fixedly connected to the left end and the right end of the upper end of the support frame 31 respectively, the liquid guiding pocket 33 with an upper opening is fixedly connected to the two mounting seats 32 respectively, the flat ports 34 are arranged at the lower end of the liquid guiding pocket 33, the upper opening of the liquid guiding pocket 33 is communicated with the flat ports 34 of the liquid guiding pocket, and when the liquid guiding grooves 25 on the front side and the rear side are communicated, the two flat ports 34 are respectively positioned right above the liquid guiding grooves 25 on the left side and the rear side.

The liquid guide bag 33 is used as a part for guiding the modifier to flow into the liquid inlet tank 25, the liquid guide bag 33 is made of flexible material, when the coiled polypropylene film is released and unfolded, the position of the polypropylene film is changed along with the reduction of the diameter, so that the positions of the two quartz glasses 21 are adjusted, the position of the liquid inlet groove 25 is also changed, the liquid guide bag 33 is inserted into the liquid inlet groove 25 for liquid guide, the liquid guide is convenient and quick, after the photocatalytic oxidation step is completed, the two quartz glasses 21 are separated from each other, the modifier is removed, and then the two quartz glasses 21 are inserted into the liquid inlet groove 25 through the liquid guide bag 33 to clean the polypropylene film and the two quartz glasses 21, so that the liquid inlet groove 25 on the left side can be matched with the liquid guide bag 33 on the left side to inject water, and the liquid inlet groove 25 on the right side can be matched with the liquid guide bag 33 on the right side to inject the modifier.

The preparation device further comprises two lamp frames 41 and two ultraviolet lamps 42, the two lamp frames 41 are respectively provided with the ultraviolet lamps 42, the two lamp frames 41 are fixedly connected with the frame 11, so that the ultraviolet lamps 42 on the two lamp frames 41 are respectively positioned on the outer sides of the two quartz glass 21, for example, the ultraviolet lamp 42 positioned on the rear side is positioned on the rear side of the quartz glass 21 positioned on the rear side. The ultraviolet lamps 42 on both sides cooperate with the quartz glass 21 on both sides to enhance the irradiation effect.

Referring to fig. 7 and 8, the preparation apparatus further includes a recycling box 51, a liquid guide plate 52, a shaft i 53, a movable guide plate 54, a partition plate 55 and a motor i 56, the liquid guide plate 52 is fixedly connected to the rear side of the upper portion of the recycling box 51, the liquid guide plate 52 is higher in rear and lower in front, the shaft i 53 is fixedly connected to the left and right ends of the recycling box 51, the rear end of the movable guide plate 54 is fixedly connected to the shaft i 53, the rear end of the movable guide plate 54 is located below the front end of the liquid guide plate 52, the partition plate 55 is fixedly connected to the bottom of the recycling box 51, the partition plate 55 is lower than the front end of the liquid guide plate 52, the liquid guide plate 52 can be located above the partition plate 55 under the condition that the liquid guide plate 52 is higher in rear and lower in front, the liquid guide plate 52 can also be located completely behind the partition plate 55, and the frame 11 is fixedly connected to the front and rear ends of the middle portion of the upper end of the recycling box 51.

The modifier is discharged to the area of the front side of the partition plate 55, the water is discharged to the area of the rear side of the partition plate 55, the partition discharge is realized, the recycling is convenient, the shaft I53 is driven to rotate through the motor I56, the motor I56 is fixedly connected to the recovery box 51, and the output shaft of the motor I56 is fixedly connected with the shaft I53. The shaft I53 can drive the movable guide plate 54 to swing, the modifier is guided to the area on the front side of the partition plate 55 when the front end of the movable guide plate 54 is connected with the upper end of the partition plate 55, and the front end of the movable guide plate 54 is used for discharging water to the area on the rear side of the partition plate 55 when located on the rear side of the partition plate 55.

The preparation device also comprises a rack 61, round steel 62, a lead screw 63, a motor II 64, a connecting plate 71, a motor III 72, a frustum 73, a disk 81, a shaft II 82, a bidirectional lead screw 83, a positioning piece 84 and a cylindrical part 85, wherein the rack 61 is fixedly connected with the round steel 62, the rack 61 is rotatably connected with the lead screw 63, an output shaft of the motor II 64 is fixedly connected with the lead screw 63, the motor II 64 is fixedly connected with the upper end of the rack 61, the connecting plate 71 is slidably connected with the round steel 62, the connecting plate 71 is in threaded connection with the lead screw 63, the motor III 72 is fixedly connected with the connecting plate 71, an output shaft of the motor III 72 penetrates through the connecting plate 71 from top to bottom, the cross section of the frustum 73 is gradually decreased from top to bottom, the frustum 73 is fixedly connected with the output shaft of the motor III 72, the disk 81 is arranged under the frustum 73, the lower end of the disk 81 is fixedly connected with the shaft II 82, the shaft II 82 is rotatably connected with the rack 61, the bidirectional lead screw 83 is rotatably connected with the disk 81, notches are respectively arranged at the left side and the right side of the disk 81, the left and right sides screw thread of two-way lead screw 83 is turned to opposite, two setting elements 84 of threaded connection on two-way lead screw 83, two setting elements 84 sliding connection are in two notches respectively, and the front and back both ends of setting element 84 respectively an organic whole are connected with cylindric portion 85. The starting motor II 64 drives the connecting plate 71 to ascend and descend to change the height of the frustum 73 so as to adapt to coiled polypropylene films with different axial lengths and facilitate loading or unloading of the coiled polypropylene films on the disc 81, the starting motor III 72 is used for driving the frustum 73 to rotate, and the coiled polypropylene films are enabled to rotate by utilizing friction force

The coiled polypropylene film is placed on the disc 81, the frustum 73 is inserted into the upper portion of the coiled polypropylene film inner paper roll, the frustum 73 can adapt to inner paper rolls with different diameters, the bidirectional screw 83 is rotated, the nut is utilized to lock the bidirectional screw 83, the distance between the two positioning pieces 84 can be adjusted, the bidirectional screw is fixed in the coiled polypropylene film, different inner diameters can be fixed, the cylindrical portion 85 can be increased in contact with the coiled polypropylene film inner cylindrical surface, and the fixing stability is improved.

Wherein the modified reagent can adopt antibacterial liquid such as compound quaternary ammonium salt and also can be other cooperation ultraviolet lamp light catalytic oxidation modified reagent, for example ammonium sulfate solution, and modified polypropylene film that obtains when adopting compound quaternary ammonium salt is applied to printed matter packing or protection film for the printed matter has certain antibiotic antitoxic effect, reduces the possibility of spreading the virus when passing, borrowing, and this printed matter cooperation ultraviolet sterilization can make bactericidal effect obtain further promotion.