CN109466201B - Regenerated flexible plate and preparation method thereof - Google Patents
Regenerated flexible plate and preparation method thereof Download PDFInfo
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- CN109466201B CN109466201B CN201710801758.9A CN201710801758A CN109466201B CN 109466201 B CN109466201 B CN 109466201B CN 201710801758 A CN201710801758 A CN 201710801758A CN 109466201 B CN109466201 B CN 109466201B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
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Abstract
The invention discloses a preparation method of a regenerated flexible plate, which comprises the following specific steps: (1) distilling the old developing solution at high temperature under reduced pressure to obtain distillation residues, and mixing the distillation residues, the supplemented monomer and the initiator in an internal mixer; (2) placing the internally mixed materials between extrusion rollers of an open type plastic mixing machine, and mixing; (3) covering transparent PET supports on two sides of the open-milled sheet elastomer, putting the open-milled sheet elastomer into a preheated mold, covering a pressing plate, and then putting the mold and the pressing plate into a flat vulcanizing machine; (4) and tearing off the transparent PET film base on the two sides of the elastomer, and then respectively coating the support with the adhesive layer and the protective film with the anti-sticking layer on the two sides of the photosensitive elastomer to finally obtain the regenerated flexible plate. The raw flexible plate and the preparation method thereof provided by the invention can be suitable for regeneration of flexible plates produced by all manufacturers, and a developing system can be any solvent developing solution.
Description
Technical Field
The invention belongs to the technical field of printing equipment, and particularly relates to a regenerated flexible plate and a preparation method thereof.
Background
The printing ink such as green and environment-friendly ink, alcohol ink and UV ink is used in the flexographic printing, so that VOC (volatile organic compounds) emission in the printing process is effectively reduced, and the ink layer almost does not contain heavy metal and is healthy and safe. The flexographic plate is generally used for package printing, is particularly suitable for package printing related to life health and safety of daily chemicals, foods, medicines, cosmetics and the like, and is also used for special printing of anti-counterfeiting, transfer printing, securities, electronic components and the like. The flexible plate has high printing endurance, simple and easily combined printing machine, short production period and high labor efficiency, and is valued and popularized by the printing industry.
The flexible resin plate includes a solid resin plate and a liquid resin plate. Many solid resin plates are available on the market, and they are classified into thick plates (3.94 mm to 7.00 mm) and thin plates (1.14mm to 2.84mm) depending on the thickness.
The flexographic plate has the consumption of more than 700 square meters every year, a large amount of residues and waste developing solution can be generated in the process of plate making and developing of the flexographic plate, the waste developing solution can be recycled through high-temperature distillation, however, the large amount of residues are very difficult to treat, and a method for treating the residues of the flexographic plate is urgently needed to be found.
Disclosure of Invention
The invention provides a regenerated flexible plate and a preparation method thereof, aiming at the problems in the prior art, an elastomer which is dissolved in a developing solution during development and is not subjected to exposure crosslinking is mixed into a uniform elastomer shape by distilling recovered flexible plate residues at high temperature under reduced pressure and adding proper monomers and initiators, and an applicable support film and a protective film are coated to prepare a regenerated flexible plate which can be used as a common flexible plate.
The object of the invention is achieved in the following way:
a preparation method of a regenerated flexible plate comprises the following specific steps:
(1) distilling the old developing solution at high temperature and reduced pressure to obtain distillation residues, mixing the distillation residues, the supplemented monomer and the initiator in an internal mixer at 90-150 ℃ for 0.5-2h, cooling to room temperature, and taking out the elastomer material;
(2) placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 10-30min at 40-90 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness;
(3) cutting the sheet elastomer into required weight, covering transparent PET support bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 80-160 ℃, and keeping the temperature for 10 min;
(4) starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on the two sides of the elastomer, then respectively covering the support body with the adhesive layer and the protective film with the anti-sticking layer on the two sides of the elastomer, then putting the elastomer into a preheated die to repeat hot pressing and cold pressing operations, and finally obtaining the regenerated flexible plate with the thickness of 1.70-5.50 mm.
The conditions of the high-temperature reduced pressure distillation are as follows: the temperature is 150 ℃ and 200 ℃, and the pressure is-0.07 to-0.09 Mpa.
The monomer is a monofunctional or polyfunctional acrylate monomer, such as 1, 6-hexanediol diacrylate, 1, 4-butanediol diacrylate, propoxylated glycerol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, polyethylene glycol (200) acrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, phthalic acid diethanol diacrylate, etc., of Tianjin Tianjiao chemical Co Ltd; 2-phenoxyethyl acrylate, 3, 5-trimethylcyclohexyl acrylate, ethoxyethoxyethyl acrylate, lauric acrylate, stearic acrylate, isodecyl methacrylate, 2-phenoxyethyl methacrylate, lauric methacrylate, benzyl acrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, ethoxylated 1, 6-hexanediol diacrylate, polyethylene glycol (600) diacrylate, 2-methyl-1, 3-propanediol diacrylate, ethylene glycol dimethacrylate, ethoxylated bisphenol A dimethacrylate, pentaerythritol triacrylate, propoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, ethoxylated glycerol triacrylate, mixtures thereof, Trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, di-trimethylolpropane tetraacrylate, etc.; ethoxylated polyethylene glycol o-phenylphenol acrylate, methoxy polyethylene glycol 400 acrylate, phenoxy diethylene glycol acrylate, 2-acryloxysuccinate, isostearic acrylate, 2-hydroxy 3-acryloxymethacryloxypropane, polyethylene glycol #1000 diacrylate, propoxylated ethoxylated bisphenol A diacrylate, tripropylene glycol diacrylate, 1, 9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, ethoxylated trimeric isocyanate triacrylate, ethoxylated glycerol triacrylate, dimethoxypropane tetraacrylate, tetramethoxymethane tetraacrylate, dipentaerythritol hexaacrylate, and the like, available from Nomura Chemicals.
The addition amount of the monomer is 0.5-2% of the total amount of the distillation residue, the monomer and the initiator.
The initiator is at least one of benzophenone, thioxanthone, benzoin and derivatives thereof, acetophenone derivatives or acylphosphine oxide photoinitiators, such as benzophenone of Reverfeng chemical Co., Ltd., Quzhou city, such as benzophenone, 2, 4-dihydroxy benzophenone, 4-chloro benzophenone, 4-phenyl benzophenone, 4' -bis (diethylamino) benzophenone, etc.; thioxanthones such as 2-isopropyl thioxanthone, 2, 4-diethyl thioxanthone, etc., from Nanjing Jinlu chemical Co., Ltd; benzonum and its derivatives such as Benzonum, Benzonum dimethyl ether, Benzonum diethyl ether, Benzonum isopropyl ether, Benzonum butyl ether, etc.; acetophenone derivatives such as diphenylethanone, 2-dimethoxy-1, 2-diphenylethanone, etc., from Jingjiang Hongtai chemical Co., Ltd; acylphosphine oxides such as aroylphosphine oxide, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, etc., from Nanjing Jinlu chemical Co.
The addition amount of the initiator is 0.2-1% of the total amount of the distillation residue, the monomer and the initiator.
The support body with the bonding layer is a polyester sheet base with the bonding layer.
The protective film with the anti-sticking layer is a frosted polyester film base with the anti-sticking layer.
A regenerated flexible plate comprises a photosensitive elastomer layer, a supporting body which is used for supporting the bottom of the photosensitive elastomer layer, a protective layer which is arranged on the top of the photosensitive elastomer layer and used for protecting the photosensitive elastomer, an anti-sticking layer which is arranged between the photosensitive elastomer layer and the protective layer and an adhesive layer which is used for connecting the supporting body and the photosensitive elastomer layer, wherein the regenerated flexible plate is prepared as described above.
Compared with the prior art, the raw flexible plate and the preparation method thereof provided by the invention can be suitable for regenerating flexible plates produced by all manufacturers, and the developing system can be any solvent developing solution. The residue recovered by high-temperature reduced-pressure distillation of the elastomer which is dissolved in the developing solution and is not subjected to exposure crosslinking during development can be used as a photosensitive elastomer to prepare a regenerated flexible plate which can be used as a common flexible plate. The screen dot reduction of the plate manufactured after exposure can reach 5 to 93 percent. The regenerated flexible plate made of the recovered residues is slightly inferior to the plate making effect of the original plate material, but the regenerated flexible plate can meet the printing requirements by independent points, independent lines, hardness, mesh point reduction and the like.
Detailed Description
The following examples are intended to further illustrate the content of the invention, but do not limit the scope of protection of the invention.
The monomers and the initiator are the UV light curing acrylic monomers and the photoinitiator which are commonly used in the process of preparing the flexographic plate.
Example 1:
a certain platemaking company uses a Huaguang R394-II flexible plate, the developing solution is a Minchen environment-friendly developing solution, and a Komao cover plate type plate washer is adopted for development. Distilling the old developing solution at 180 deg.C and-0.08 Mpa, adding 0.5% 1,6 hexanediol acrylate (Tianjin Tianjiao chemical Co., Ltd.) and 1.0% 2, 2-dimethoxy-1, 2-diphenylethanone (custom 651, Jingjing Hongtai chemical Co., Ltd.) into the residue, mixing at 90 deg.C for 2h, cooling to room temperature, and taking out the obtained elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 10min at 50 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 80 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 3.94 mm.
By using a Komao cover plate washing machine, a quick morning environment-friendly developing solution and a Komao plate printing machine, through back exposure, main exposure, plate washing, drying, post exposure and adhesion removal treatment, the regeneration flexographic plate screen point reduction can reach 5-93%, independent points are 0.30mm, independent lines are 0.30mm, exposure latitude is 32.4%, and other properties meet the printing requirements of plates with equal thickness.
Example 2
A cover plate type plate washing machine is used for development of a small flexographic plate making company, the developing solution is of the tetrachloroethylene type, and the plate material only adopts one type of the Huaguang flexographic plate R394Q-II. Distilling the old developing solution at 150 deg.C and-0.07 Mpa, recovering the evaporated solvent, and collecting the solid residue as photosensitive elastomer. Recovering residues, supplementing 2.0% of trimethylolpropane trimethacrylate (Tianjin Tianjiao chemical Co., Ltd.) and 1, 6% of hexanediol acrylate mixed monomer (Tianjin Tianjiao chemical Co., Ltd.) and 1.0% of 2, 2-dimethoxy-1, 2-diphenylethanone photoinitiator (Jingjiang Hongtai chemical Co., Ltd.), mixing for 0.5h at 150 ℃, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 30min at 40 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 100 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 3.94 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-90%, independent dots of 0.30mm, independent lines of 0.30mm, exposure latitude of 35.4% and other performances, and the printing requirements of plates with equal thickness are met.
Example 3
One family uses a DuPont HDC type flexible plate with the thickness of 3.94mm, and a Komao connecting line type plate washing machine and a quick morning environment-friendly developing solution are used for developing. Distilling the old developing solution at 160 deg.C and-0.09 Mpa, recovering the distilled solvent, and collecting the solid residue as photosensitive elastomer. Recovering the residue, adding 0.5% of a mixed monomer of propoxylated glycerol triacrylate (Zhuhai Changxing chemical materials Co., Ltd.) and trihydroxy acrylate (Zhuhai Changxing chemical materials Co., Ltd.) and 0.2% of a benzophenone photoinitiator (Zhenhuazhou Ruilfeng chemical industries Co., Ltd.), mixing for 1h at 130 ℃, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 20min at 90 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 120 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 3.94 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.30mm of independent dots, 0.20mm of independent lines, 28.0% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Example 4
A large platemaking company uses a Fulingte FAC type 1.70mm digital plate, and the company has a Gulongyan connecting line type plate washer, and the black film can be peeled off in advance during development of the environment-friendly developing solution. Distilling the used developer at 170 deg.C and-0.075 Mpa, recovering the evaporated solvent, and collecting the solid residue as photosensitive elastomer. Recovering the residue, supplementing 1.5% of 1,6 hexanediol acrylate monomer (Tianjin Tianjiao chemical Co., Ltd.) and 0.4% of 1-hydroxycyclohexyl benzyl ketone (Quzhou Ruilfeng chemical Co., Ltd.) and benzophenone (Quzhou Ruilfeng chemical Co., Ltd.) mixed photoinitiator, mixing for 1h at 130 ℃, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 20min at 80 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 160 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 2.28 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.20mm of independent dots, 0.20mm of independent lines, 36.6% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Example 5
One family uses a DuPont HDC type flexible plate with the thickness of 3.94mm, and a Komao connecting line type plate washing machine and a quick morning environment-friendly developing solution are used for developing. Distilling the old developing solution at 160 deg.C and-0.09 Mpa, recovering the distilled solvent, and collecting the solid residue as photosensitive elastomer. Recovering the residue, adding 1.2% of 3,3, 5-trimethylcyclohexyl acrylate (Zhuhai Changxing chemical materials, Inc.) and di-trimethylolpropane tetraacrylate (Zhuhai Changxing chemical materials, Inc.) mixed monomer and 0.2% of benzophenone photoinitiator (Zhenzhou Rui Er Feng chemical industries, Inc.), mixing for 0.8h at 125 ℃, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 15min at 70 ℃, uniformly mixing, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 120 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 1.70 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.30mm of independent dots, 0.20mm of independent lines, 35.0% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Example 6
One family uses a DuPont HDC type flexible plate with the thickness of 3.94mm, and a Komao connecting line type plate washing machine and a quick morning environment-friendly developing solution are used for developing. Distilling the old developing solution at 160 deg.C and-0.09 Mpa, recovering the distilled solvent, and collecting the solid residue as photosensitive elastomer. Recovering the residue, adding 1.6% of mixed monomer of ethoxylated bisphenol A dimethacrylate (Zhuhai Changxing chemical materials Co., Ltd.) and trimethylolpropane trimethacrylate (Zhuhai Changxing chemical materials Co., Ltd.) and 0.6% of 2-isopropyl thioxanthone photoinitiator (Nanjing Jinlu chemical Co., Ltd.), mixing at 125 ℃ for 0.8h, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 15min at 70 ℃, uniformly mixing, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 120 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 2.84 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.20mm of independent dots, 0.20mm of independent lines, 38.3% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Example 7
One family uses a DuPont HDC type flexible plate with the thickness of 3.94mm, and a Komao connecting line type plate washing machine and a quick morning environment-friendly developing solution are used for developing. Distilling the old developing solution at 160 deg.C and-0.09 Mpa, recovering the distilled solvent, and collecting the solid residue as photosensitive elastomer. Recovering residue, adding 1.8% of mixed monomer of ethoxy polyethylene glycol o-phenylphenol acrylate (New Zhongcun chemical Co., Ltd.) and polyethylene glycol (600) diacrylate (Zhuhai Changxing chemical materials Co., Ltd.), 0.8% of mixed photoinitiator of benzoin (Nanjing Jinlu chemical Co., Ltd.) and benzoin isopropyl ether (Nanjing Jinlu chemical Co., Ltd.), mixing at 125 deg.C for 0.8h, cooling to room temperature, and taking out the prepared elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 15min at 70 ℃, uniformly mixing, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 120 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 4.70 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.20mm of independent dots, 0.30mm of independent lines, 32.9% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Example 8
One family uses a DuPont HDC type flexible plate with the thickness of 3.94mm, and a Komao connecting line type plate washing machine and a quick morning environment-friendly developing solution are used for developing. Distilling the old developing solution at 160 deg.C and-0.09 Mpa, recovering the distilled solvent, and collecting the solid residue as photosensitive elastomer. Recovering the residue, adding 0.8% of a mixed monomer of ethoxylated isocyanotriacrylate (Ningmura chemical Co., Ltd.) and tetramethoxymethane tetraacrylate (Ningmura chemical Co., Ltd.), 0.9% of aroylphosphine oxide (Jingjiang Hongtai chemical Co., Ltd.) and 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (Jingjiang Hongtai chemical Co., Ltd.) to the residue, kneading the mixture at 125 ℃ for 0.8h, cooling the mixture to room temperature, and taking out the obtained elastomer material; placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 15min at 70 ℃, uniformly mixing, and finally mixing the elastomer material into a sheet elastomer with proper thickness; cutting the sheet elastomer which is milled well into required weight, covering transparent PET supporting bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 120 ℃, and keeping the temperature for 10 min; starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on the two sides of the elastomer, then respectively coating a polyester sheet base with an adhesive layer and a frosted polyester sheet base with an anti-sticking layer on the two sides of the elastomer, then putting the elastomer into a preheated mould to repeat hot pressing and cold pressing operations, and finally pressing the elastomer into a regenerated flexible plate with the thickness of 5.50 mm.
After plate making, the following can be obtained: the screen dot reduction can obtain 5-93%, and the performances of 0.30mm of independent dots, 0.30mm of independent lines, 37.4% of exposure latitude and the like meet the printing requirements of plates with equal thickness.
Comparative example 1
By using the gorgeous light R394-II to carry out back exposure, main exposure, plate washing, drying, post exposure and de-sticking treatment, the dot reduction can reach 3 to 93 percent, the independent dots are 0.30mm, the independent lines are 0.20mm, the exposure latitude is 34.5 percent, and the like, thereby meeting the printing requirements.
From the above and the comparative examples and comparative examples it can be derived that: the regenerated flexible plate and the preparation method thereof disclosed by the invention can be suitable for any type of flexible plate. According to the invention, the old developing solution is distilled at high temperature under reduced pressure, the distilled solvent is recycled, and the distillation residues can be utilized to prepare a regenerated flexible plate. The prepared plate material of the regenerated flexible plate with the screen dot reduction and exposure latitude meeting the printing requirements.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (9)
1. A method for preparing a regenerated flexible plate is characterized by comprising the following steps: the method comprises the following specific steps:
(1) distilling the old developing solution at high temperature and reduced pressure to obtain distillation residues, mixing the distillation residues, the supplemented monomer and the initiator in an internal mixer at 90-150 ℃ for 0.5-2h, cooling to room temperature, and taking out the prepared elastomer material;
(2) placing the internally mixed elastomer material between extrusion rollers of an open type plastic mixer, mixing for 10-30min at 40-90 ℃, mixing uniformly, and finally mixing the elastomer material into a sheet elastomer with proper thickness;
(3) cutting the sheet elastomer into required weight, covering transparent PET support bodies on two sides, putting the sheet elastomer into a preheated mold, covering a pressing plate, putting the mold and the mold into a flat vulcanizing machine, pressurizing to 20MPa at 80-160 ℃, and keeping the temperature for 10 min;
(4) starting circulating cooling water to fully cool to room temperature, and then opening the mold to take out the elastomer; tearing off the transparent PET support body on the two sides of the elastomer, then respectively covering the support body with the adhesive layer and the protective film with the anti-sticking layer on the two sides of the elastomer, then putting the elastomer into a preheated die to repeat hot pressing and cold pressing operations, and finally obtaining the regenerated flexible plate with the thickness of 1.70-5.50 mm.
2. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the conditions of the high-temperature reduced pressure distillation are as follows: the temperature is 150 ℃ and 200 ℃, and the pressure is-0.07 to-0.09 Mpa.
3. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the monomer is a monofunctional group or polyfunctional group acrylate monomer.
4. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the addition amount of the monomer is 0.5-2% of the total amount of the distillation residue, the monomer and the initiator.
5. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the initiator is at least one of benzophenone, thioxanthone, benzoin and derivatives thereof, acetophenone derivatives or acylphosphine oxide photoinitiators.
6. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the addition amount of the initiator is 0.2-1% of the total amount of the distillation residue, the monomer and the initiator.
7. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the support body with the bonding layer is a polyester sheet base with the bonding layer.
8. The method of producing a regenerated flexographic plate according to claim 1, characterized in that: the protective film with the anti-sticking layer is a frosted polyester film base with the anti-sticking layer.
9. The utility model provides a regeneration flexographic plate, includes photosensitive elastomer layer, plays the supporter of supporting role in photosensitive elastomer layer bottom, is located the protective layer that photosensitive elastomer layer top played the effect of protection photosensitive elastomer to and be located the antiseized layer between photosensitive elastomer layer and the protective layer and link up the adhesive linkage on supporter and photosensitive elastomer layer, its characterized in that: the regenerated flexible plate is prepared as described in claim 1.
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| CN201710801758.9A CN109466201B (en) | 2017-09-07 | 2017-09-07 | Regenerated flexible plate and preparation method thereof |
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| CN201710801758.9A CN109466201B (en) | 2017-09-07 | 2017-09-07 | Regenerated flexible plate and preparation method thereof |
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