WO2024037055A1

WO2024037055A1 - Leather release paper production apparatus and leather release paper production method

Info

Publication number: WO2024037055A1
Application number: PCT/CN2023/092321
Authority: WO
Inventors: 封玉龙; 成鹏; 朱焕铮; 陆梦琳; 陆晶
Original assignee: 中广核达胜加速器技术有限公司
Priority date: 2022-08-18
Filing date: 2023-05-05
Publication date: 2024-02-22
Also published as: CN115284684A

Abstract

Provided in the present invention is a leather release paper production apparatus, for use in producing a leather release paper. The leather release paper production apparatus comprises a female embossing roller, a first coating roller abutting against the female embossing roller, a first coating tank for allowing the first coating roller to stick an ultra-low surface tension coating, a second coating roller abutting against the female embossing roller, a second coating tank for allowing the second coating roller to stick an electron beam curing release paper coating, and a curing device facing the female embossing roller to cure the ultra-low surface tension coating on the female embossing roller. The first coating roller and the second coating roller are spaced apart from each other along the radial direction, and the curing device is arranged between the first coating roller and the second coating roller along the radial direction. According to the leather release paper production apparatus of the present invention, the ultra-low surface tension coating is coated before coating the electron beam curing release paper coating and is cured by the curing device, so that the surface tension of the female embossing roller and the surface tension of the leather release paper can be reduced.

Description

Leather release paper production device and leather release paper production method

Technical field

The invention relates to a leather release paper production device and a leather release paper production method.

Background technique

The development of leather release paper began in the 1960s, and its development has roughly gone through three stages of technological change: direct silicone coating, primer plus release layer coating, and thermoplastic resin coating. Early leather release papers mostly used direct silicone coating release agents as the release layer. After drying and solidification, the pattern was pressed and prepared. The leather release paper produced using this technology can be reused only a few times, usually around 5 times, and the pattern is not clear enough, so it was eliminated in the 1970s. Primer plus release layer coating is the main production method of silicone leather release paper. The specific method is to apply a layer of primer on the base paper to improve the smoothness of the base paper and the ability to resist the penetration of silicone paint. The primer After curing, apply a release layer and cure. Curing methods include thermal curing, ultraviolet curing, electron beam (EB) curing, etc. Compared with early leather release paper, the advantages of this type of leather release paper are that the surface of the paper is more uniform, the pattern is clearer, the number of times the paper can be reused is greatly increased, and it can be used for the production of both PVC leather and PU leather.

Using radiation-cured release materials as the release layer of leather release paper can overcome the shortcomings of thermosetting resin leather release papers, which are curling, wrinkling, pinholes, etc. caused by high-temperature treatment. The main mechanism of radiation curing is: after the radiation curing coating is irradiated by ultraviolet light or electron beam, the photoinitiator absorbs the ultraviolet or electron beam radiation energy and is activated. The outer electrons of its molecules jump to generate active centers in a very short time. The active center interacts with the unsaturated groups in the resin, causing the double bonds in the photocurable resin and reactive diluent molecules to break, causing a continuous polymerization reaction to cross-link each other to form a film.

The peeling force of electron beam cured leather release paper is affected by its surface tension. The lower the surface tension of the release paper, the lower the peeling force and the higher the number of uses, which reduces the cost of leather production.

The surface tension of the release paper is affected by the surface tension of the embossed material. When the surface tension of the embossed material is relatively low, the surface tension of the release paper is also relatively low. In the experiment, we found that The release paper with textured polypropylene film has a lower surface tension than the release paper with textured PET film. Because the surface tension (or polarity) of the PET film is relatively high, it attracts the polarity of the uncured release coating. There are more sexual groups, resulting in a higher surface tension after the release coating is cured.

However, plastic materials are not suitable for use as embossing rollers because plastic materials cannot withstand long-term electron beam irradiation, and the material used for the embossing rollers must be metal. The surface tension of metals is usually high, so the surface tension of the electron beam release paper produced is also high.

In view of this, it is necessary to improve the existing leather release paper production device to solve the above problems.

Contents of the invention

The object of the present invention is to provide a leather release paper production device to solve the problems of high surface tension and low use frequency of existing leather release paper.

In order to achieve the above object, the present invention provides a leather release paper production device for producing leather release paper. The leather release paper production device includes a concave embossing roller, which resists the concave embossing roller. The first coating roller, the first material box for the first coating roller to adhere to the ultra-low surface tension paint, the second coating roller against the concave embossing roller, and the The second coating roller adheres to a second cartridge for electron beam curing release paper paint and a curing device facing the concave embossing roller to solidify the paint on the concave embossing roller. The first The coating roller and the second coating roller are arranged radially apart, and the curing device is arranged radially between the first coating roller and the second coating roller.

As a further improvement of the present invention, along the vertical direction, the first coating roller and the second coating roller resist the lower side of the concave embossing roller.

As a further improvement of the present invention, the leather release paper production device further includes an electron beam dryer arranged on the upper side of the concave embossing roller.

As a further improvement of the present invention, the curing device is one or more of a thermal curing device, a UV light curing device and an electron beam curing device.

As a further improvement of the present invention, the leather release paper production device further includes steering rollers arranged on both sides of the concave embossing roller in the horizontal direction.

As a further improvement of the present invention, the ultra-low surface tension coating contains a silicone material, and the silicone material is a polymer silicone resin, a low molecular silicone oil, a vinyl silicone oil, a hydrogen-containing silicone oil, or an acrylate modified silicone oil. one or more.

As a further improvement of the present invention, the ultra-low surface tension coating also contains a diluent, and the diluent is one or more of isobornyl acrylate, acrylate laurate, isooctyl acrylate, toluene, and xylene .

As a further improvement of the present invention, the components and mass percentages of the electron beam cured release paper coating are as follows: 40-80% polyurethane acrylic resin; 10-50% high functionality acrylic ester monomer; 5-10% release agent %.

The invention also provides a production method of leather release paper. The production method of leather release paper includes the following steps:

S1: Provide the above-mentioned leather release paper production device;

S2: Prepare ultra-low surface tension paint and place it in the first material box; prepare electron beam curing release paper paint and place it in the second material box;

S3: Rotate the concave embossing roller, and the first coating roller applies the ultra-low surface tension paint in the first material box to the concave embossing roller;

S4: Start the curing device to cure the ultra-low surface tension paint coated on the concave embossing roller;

S5: The concave embossing roller coated with the cured ultra-low surface tension coating resists the second coating roller, and the second coating roller applies the electron beam cured release paper coating to the concave embossing on roller;

S6: The concave embossing roller further rotates until it contacts the base leather release paper, and the pattern on the concave embossing roller is directly copied to the leather release paper.

As a further improvement of the present invention, the leather release paper production device further includes an electron beam dryer disposed on the upper side of the concave embossing roller, and the leather release paper production method after step S6 also includes: Before the leather release paper and the concave embossing roller are separated, an electron beam dryer is used to solidify the electron beam cured release paper coating on the concave embossing roller.

The beneficial effects of the present invention are: the leather release paper production device and the leather release paper of the present invention The production method includes applying ultra-low surface tension paint before applying the electron beam cured release paper paint and solidifying it through a curing device, thereby reducing the surface tension of the concave embossing roller, thereby reducing the production of the ultra-low surface tension paint. The surface tension of the leather release paper can be increased to increase the number of uses of the leather release paper and reduce costs.

Description of drawings

Figure 1 is a schematic structural diagram of the leather release production device of the present invention;

Figure 2 is a flow chart of the production method of the leather release paper of the present invention.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis. Furthermore, various embodiments of the present invention are described below The technical features involved in can be combined with each other as long as they do not conflict with each other.

As shown in Figure 1, the leather release paper production device 100 of the present invention is used to produce leather release paper 200.

The leather release paper production device 100 includes a concave embossing roller 1, a first coating roller 2 that resists the concave embossing roller 1, and is used for the first coating roller 2 to adhere to The first cartridge 3 of low surface tension paint and the second coating roller 4 that resists the concave embossing roller 1 are used for the second coating roller 4 to adhere to the electron beam curing release paper coating. The second material box 5, the curing device 6 facing the concave embossing roller 1 to solidify the paint on the concave embossing roller 1, and the curing device 6 disposed on both sides of the concave embossing roller 1 in the horizontal direction Turning roller 7 and electron beam dryer 8 provided on the upper side of the concave embossing roller 1 .

Along the vertical direction, the first coating roller 2 and the second coating roller 4 resist the lower side of the concave embossing roller 1 .

The first coating roller 2 and the second coating roller 4 are arranged radially apart, and the curing device 6 is arranged radially between the first coating roller 2 and the second coating roller 4 between.

In this embodiment, the concave embossing roller 1 is pressed against the first coating roller 2 to apply the ultra-low surface tension coating to the concave embossing roller 1, and then the curing method is used. The device 6 solidifies the ultra-low surface tension coating on the concave embossing roller 1, and then passes through the second coating roller 4 to apply the electron beam curing release paper coating.

The curing device 6 is one or more of a thermal curing device, a UV light curing device and an electron beam curing device. The curing device 6 needs to be selected according to the type of ultra-low surface tension coating in order to obtain better curing effect.

The ultra-low surface tension coating contains an organic silicon material and a diluent. The organic silicon material It is one or more of high molecular silicone resin, low molecular silicone oil, vinyl silicone oil, hydrogenated silicone oil, and acrylate modified silicone oil.

The ultra-low surface tension coating can effectively reduce the surface tension of the concave embossing roller 1, thereby reducing the surface tension of the leather release paper 200. The peeling force is subsequently reduced, and the number of uses is increased. The leather release paper 200 production costs reduced. The ultra-low surface tension coating does not require an excellent curing speed, but after being coated on the concave embossing roller 1, the surface tension of the concave embossing roller 1 must be below 26 dyne.

The diluent is one or more selected from isobornyl acrylate, lauric acrylate, isooctyl acrylate, toluene, and xylene.

The viscosity of ultra-low surface tension paint should be between 100-20000 cps. If only silicone materials are used, the viscosity may be too high, making the coating thickness more than 1 micron, making curing more difficult, so an appropriate amount of diluent can be added to dilute it. The viscosity is below 500cps, but it must be blown dry before applying the electron beam cured release paper coating to ensure that no solvent that cannot be electron beam cured will affect the subsequent electron beam cured release paper coating.

The components and mass percentages of the electron beam cured release paper coating are as follows: 40% to 80% polyurethane acrylic resin; 10% to 50% high functionality acrylic ester monomer; 5% to 10% release agent.

As shown in Figure 2, the production method of leather release paper includes the following steps:

S1: Provide the above-mentioned leather release paper production device 100;

S2: Prepare ultra-low surface tension paint and place it in the first material box 3, prepare electron beam curing release paper paint and place it in the second material box 5;

S3: Rotate the concave embossing roller 1, and the first coating roller 2 applies the ultra-low surface tension paint in the first magazine 3 to the concave embossing roller 1;

S4: Start the curing device 6 to solidify the ultra-low surface tension paint coated on the concave embossing roller 1;

S5: The concave embossing roller 1 coated with the cured ultra-low surface tension paint resists the second coating roller 4, and the second coating roller 4 coats the electron beam cured release paper paint on the concave embossing roller 1. Type embossing roller 1;

S6: The concave embossing roller 1 further rotates until it resists the leather release paper base paper. Before the leather release paper 200 and the concave embossing roller 1 are separated, the electron beam dryer 8 is used to dry the concave embossing roller 1. The electron beam cured release paper coating on the embossing roller 1 is cured, and the pattern on the concave embossing roller 1 is directly copied to the leather release paper 200 .

In the present invention, an ultra-low surface tension paint of less than one micron is coated on the concave embossing roller 1. Its main function is to reduce the surface tension of the concave embossing roller 1. A part of the ultra-low surface tension paint will remain on the concave embossing roller 1. On the embossing roller 1, another part will be absorbed into the electron beam cured release paper coating and will not form a separate release layer.

Further, the present invention provides the following three embodiments:

Example 1:

S1: Provide the above-mentioned leather release paper production device 100;

S2: Put 5kg of 107 silicone rubber and 95kg of xylene into the reaction container, stir (2000ppm) at room temperature for 30 minutes until uniform, then pour into the first material box 3, prepare the electron beam curing release paper coating, and put it in In the second material box 5;

S4: Start the heat curing machine to blow out hot air at 200°C, and apply it on the concave embossing roller 1 Ultra-low surface tension coating curing;

S6: The concave embossing roller 1 further rotates until it resists the leather release paper base paper. Before the leather release paper 200 and the concave embossing roller 1 are separated, the electron beam dryer 8 is used to dry the concave embossing roller 1. The electron beam cured release paper coating on the embossing roller 1 is cured, and the pattern on the concave embossing roller 1 is directly copied to the leather release paper 200, and then rolled up, the curing voltage is 500kev, and the curing dose 30kGy, linear speed 20m/min.

Example 2:

S1: Provide the above-mentioned leather release paper production device 100;

S2: Put 80kg of 500cps, vi=10% vinyl silicone oil, 15kg of IBOA (isobornyl acrylate) and 5kg of photoinitiator 1173 into the reaction vessel, stir at room temperature (2000ppm) for 30 minutes until uniform, and put it in the In the first material box 3, electron beam curing release paper coating is prepared and placed in the second material box 5;

S4: Start the UV light curing device to cure the ultra-low surface tension coating coated on the concave embossing roller 1 with a curing energy of 1000mj/cm ² ;

Example 3:

S1: Provide the above-mentioned leather release paper production device 100;

S2: Put 80kg of 500cps, vi=10% vinyl silicone oil and 20kg of 200cps acrylate modified silicone oil into the reaction vessel, stir (2000ppm) at room temperature for 30 minutes until uniform, and put them in the first material box 3 Within, electron beam curing release paper coating is prepared and placed in the second material box 5;

S4: Start the electron beam curing device, and cure the ultra-low surface tension paint coated on the concave embossing roller 1 under a nitrogen atmosphere (oxygen concentration is less than 200 ppm). The irradiation energy is 90KeV and the irradiation dose is 80kGy;

S6: The concave embossing roller 1 further rotates until it resists the leather release paper base paper. Before the leather release paper 200 and the concave embossing roller 1 are separated, the electron beam dryer 8 is used to dry the concave embossing roller 1. The electron beam cured release paper coating on the embossing roller 1 is cured, and the concave embossing The pattern on roller 1 is directly copied to the leather release paper 200, and then rolled up. The curing voltage is 500kev, the curing dose is 30kGy, and the linear speed is 20m/min.

Comparative example:

Put 50kg of Allnex resin grades EB9260, 20kg of EB230, 22kg of ethoxylated trimethylol triacrylate (EO ₃ -TMPTA), 4kg of the release agent Allnex EB350, and 4kg of Digo 2700 into the reaction vessel and stir at room temperature ( 2000ppm) for 30 minutes until the electron beam cured release paper coating is evenly obtained. After the coating roller transfers the electron beam cured release paper coating to the embossing roller, since the leather release paper base paper is close to the embossing roller, the pattern on the embossing roller is Copy directly to leather release paper 200. When the leather release paper 200 passes through the electron beam drying area, the electron beam cured release paper coating is rapidly cured, with a curing voltage of 500kev, a curing dose of 30kGy, and a linear speed of 20m/min, and then is rolled up.

The leather release paper 200 obtained in Example 1, Example 2, Example 3 and the comparative example was tested for data and compared. The results are as follows:

It can be seen that the number of uses of the leather release paper 200 obtained in Examples 1, 2 and 3 in which the ultra-low surface tension coating process is increased is compared with the number of uses of the leather release paper 200 obtained in the control group. , there is a significant improvement.

The leather release paper production device 100 and the leather release paper production method of the present invention are achieved by Before applying the electron beam curing release paper coating, the ultra-low surface tension coating is applied and cured through the curing device 6, thereby reducing the surface tension of the concave embossing roller 1 and thereby reducing the release of the leather produced. The surface tension of the liner 200 increases the number of uses of the leather release liner 200 and reduces the cost.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.

The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims

A leather release paper production device used to produce leather release paper, characterized in that: the leather release paper production device includes a concave embossing roller, and a first coating layer resisting the concave embossing roller. cloth roller, a first material box for the first coating roller to adhere to ultra-low surface tension paint, a second coating roller against the concave embossing roller, and a first material box for the first coating roller to adhere to the ultra-low surface tension coating The coating roller adheres to the second cartridge for electron beam curing release paper coating, and the curing device faces the concave embossing roller to solidify the coating on the concave embossing roller. The first coating roller and The second coating rollers are arranged radially apart, and the curing device is arranged radially between the first coating roller and the second coating roller.
The leather release paper production device according to claim 1, characterized in that: along the vertical direction, the first coating roller and the second coating roller are in contact with the lower side of the concave embossing roller. hold.
The leather release paper production device according to claim 1, characterized in that: the leather release paper production device further includes an electron beam dryer arranged on the upper side of the concave embossing roller.
The leather release paper production device according to claim 1, characterized in that the curing device is one or more of a thermal curing device, a UV light curing device and an electron beam curing device.
The leather release paper production device according to claim 1, characterized in that: the leather release paper production device further includes steering rollers arranged on both sides of the concave embossing roller in a horizontal direction.
The leather release paper production device according to claim 1, characterized in that: the ultra-low surface tension coating contains a silicone material, and the silicone material is a high molecular silicone resin, a low molecular silicone oil, a vinyl silicone oil, One of hydrogen-containing silicone oil and acrylate modified silicone oil or more.
The leather release paper production device according to claim 6, characterized in that: the ultra-low surface tension coating also contains a diluent, and the diluent is isobornyl acrylate, lauric acrylate, isooctyl acrylate, One or more of toluene and xylene.
The leather release paper production device according to claim 1, characterized in that: the components and mass percentages of the electron beam cured release paper coating are as follows: polyurethane acrylic resin 40% to 80%; high functionality acrylate monomer 10~50%; release agent 5~10%.
A method for producing leather release paper, which is characterized in that: the production method of leather release paper includes the following steps:

S1: Provide the leather release paper production device according to any one of claims 1-8;

S2: Prepare ultra-low surface tension paint and place it in the first material box; prepare electron beam curing release paper paint and place it in the second material box;

S3: Rotate the concave embossing roller, and the first coating roller applies the ultra-low surface tension paint in the first material box to the concave embossing roller;

S4: Start the curing device to cure the ultra-low surface tension paint coated on the concave embossing roller;

S5: The concave embossing roller coated with the cured ultra-low surface tension coating resists the second coating roller, and the second coating roller applies the electron beam cured release paper coating to the concave embossing on roller;

S6: The concave embossing roller further rotates until it contacts the leather release paper base paper, and the pattern on the concave embossing roller is directly copied to the leather release paper base paper.
The production method of leather release paper according to claim 9, characterized in that: the leather release paper production device further includes an electron beam dryer arranged on the upper side of the concave embossing roller, and the leather release paper After step S6 of the paper production method, the method also includes: preparing the leather release paper and the concave Before the concave embossing roller is detached, an electron beam dryer is used to solidify the electron beam cured release paper coating on the concave embossing roller.