阅读说明：本技术 一种特卫强用水性柔版印刷材料及其制备方法 (Aqueous flexographic printing material for Tyvek and preparation method thereof ) 是由 王学春 李建华 于 2020-12-26 设计创作，主要内容包括：本发明适用于印刷材料制备技术领域,提供了一种特卫强用水性柔版印刷材料,包括以下重量百分比的原料组分：冲淡剂55～65％,所述冲淡剂包括以下重量百分比的原料组分：聚氨酯树脂60～80％,丙烯酸树脂0～35％,附着力促进剂1～5％,耐磨剂1-4％,润湿剂0～1％,稳定剂0～8％,消泡剂0.1～0.5％,去离子30～40％；水性色浆35～45％,借此,本发明在用柔版印刷机印刷特卫强材料时具有印刷图案清晰,附着力良好,干燥速度快,低气味且符合最新的环保要求的特点,完全可以取代现用的高VOC溶剂型油墨。(The invention is suitable for the technical field of printing material preparation, and provides a waterborne flexographic printing material for Tyvek, which comprises the following raw material components in percentage by weight: 55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water; 35-45% of water-based color paste, so that the water-based color paste has the characteristics of clear printing patterns, good adhesive force, high drying speed, low odor and accordance with the latest environmental protection requirement when the flexographic printing machine is used for printing the Tyvek material, and can completely replace the conventional high VOC solvent-based ink.)

1. The aqueous flexographic printing material for the Tyvek printing is characterized by comprising the following raw material components in percentage by weight:

55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water;

35-45% of water-based color paste.

2. The aqueous flexographic printing material for tyvek according to claim 1, characterized in that the content of said polyurethane resin is 65%.

3. The aqueous flexographic printing material for tyvek according to claim 1, characterized in that the adhesion promoter is present in an amount of 3.5%.

4. The aqueous flexographic printing material for tyvek according to claim 1 or 2, characterized in that the polyurethane resin is an aqueous polyurethane resin having a minimum film forming temperature of < 5 ℃, said aqueous polyurethane resin being ETERANE89216, etene 89235 of chang, taiwan, or WITCOBOND 362-02, WITCOBOND 781 of langsheng, germany.

5. Aqueous flexographic printing material according to claim 1, characterized in that said acrylic resin is an aqueous acrylic resin with a minimum film forming temperature < 20 ℃ which is JONCRYL 7256 or JONCRYL 74-a of basf, germany.

6. The aqueous flexographic printing material for tyvek according to claim 1 wherein said adhesion promoter is a polyester polyol and said defoamer is a silicone or mineral oil defoamer.

7. The aqueous flexographic printing material for tyvek according to claim 1, characterized in that the abrasion resistant agent is a polyethylene wax, which is german kraine wax 3620 or american trefoil S-232.

8. The aqueous flexographic printing material for tyvek according to claim 1 wherein the wetting agent is a sodium sulfosuccinate-based wetting agent.

9. Aqueous flexographic printing material according to claim 1, characterized in that said stabilizer is an organic amine which is isopropanolamine or triisopropanolamine or dimethylethanolamine or triethanolamine.

10. A method of preparing a composition using the aqueous flexographic printing material of tyvek as claimed in any of claims 1 to 9, comprising the steps of:

A. preparation of the thinner: weighing polyurethane resin, acrylic resin, an adhesion promoter, a wear-resisting agent, a wetting agent, a stabilizer, a defoaming agent and deionized water according to a proportion, and uniformly mixing in a reaction kettle for later use;

B. and C, uniformly mixing the water-based color paste and the thinner in the step A, and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

Technical Field

The invention relates to the technical field of printing material preparation, in particular to a waterborne flexographic printing material with Tyvek strength and a preparation method thereof.

Background

Tyvek is a unique nonwoven product recently introduced that is spun bonded olefin from numerous fine polyethylene fibers, and this unique jet spinning technology produces very tough materials that are lightweight and highly reflective. The material has the characteristics of difficult deformation, softness, smoothness, lightness, toughness, excellent opacity, moisture resistance, water stain resistance and the like, and is widely applied to the medical packaging and food packaging industries. However, because the ink is made of polyethylene materials, the problems of strong material surface inertia and uneasy and easy printing exist, and the current printing industry mostly adopts solvent type ink with high VOC for printing to solve the problem of easy color fading after printing of Tyvek materials, but the solvent type ink releases a large amount of VOCs in the drying process to seriously pollute the atmospheric environment, and the surface of the solvent type ink also has residual toxic substances after printing, which has certain harm to human bodies, and the use of the solvent type ink with high VOCs emission is increasingly limited along with the treatment of environmental pollution in various countries and the enhancement of environmental protection and health consciousness of people. The aqueous replacement of printing materials is increasingly important.

Although various aqueous printing materials are available on the market at present, no aqueous flexographic printing material special for printing of Tyvek materials exists, and the existing aqueous printing materials have the problems of slow drying, low adhesion and easy pasting.

At present, Chinese patent application numbers are as follows: 201510109608.2 discloses a glazing-free double-PE water-based flexographic ink and a preparation method thereof, wherein the glazing-free double-PE water-based flexographic ink comprises 40-60% of ink mixing oil and 40-60% of water-based color paste; the varnish comprises 60-80% of soft emulsion, 0-10% of hard emulsion, 0-25% of water-soluble resin liquid, 1-3% of anti-scraping agent, 1-3% of cross-linking agent, 0-3% of water repellent agent, 0-1% of flatting agent, 0-8% of film-forming assistant, 0.1-0.5% of defoaming agent and the balance of deionized water. The lustering-free double-PE water-based flexographic ink disclosed by the document has the characteristics of high gloss, water resistance, wear resistance, freezing resistance and the like, but the ink is only suitable for double-PE cup printing and has the problems of low drying speed and poor redissolution property and easy plate pasting when printing extreme strong. Chinese patent, application number is: 200610062147.9 discloses a water-based flexographic printing ink and a preparation method thereof, which comprises 8.7-47.2% of film-forming resin emulsion, 40-50% of water-based acrylic color paste, 0.1-0.3% of defoaming agent, 0.2-2.0% of water-based wax paste, 2-8% of isopropanol, 10-30% of ethylene glycol, 0.5-1% of ethanolamine and the balance of water; the aqueous flexographic printing ink disclosed in this document has the advantages of clear print, low production cost, and the like; the ink has good adaptability to printing of coated paper, but has the problems of poor adhesion and easy decolorization when the ink is used for a low-surface-tension and low-permeability material such as Tyvek. Chinese patent, application number is: the invention patent document of CN201910851670.7 is a water-based ink suitable for OPP printing, which comprises 30-50% of water-based polyurethane emulsion, 30-50% of alcohol, 3-6% of water-based cross-linking agent, 3-6% of deionized water and 3-6% of water-based adhesion promoter. The adhesive force of the OPP film is good by adopting the waterborne polyurethane emulsion, the adhesive force fastness on the OPP film is enhanced by adding the waterborne cross-linking agent and the waterborne adhesive force promoter, so that the adhesive force requirement of the printing ink of the OPP film is met, the printing ink has good adhesive force on the OPP film, but contains 30-50% of alcohol, does not meet the latest technical requirement of an HJ 371-2018 environmental marking product, and belongs to a high VOC product.

In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.

Disclosure of Invention

Aiming at the defects, the invention aims to provide the aqueous flexographic printing material for the Tyvek printing and the preparation method thereof, which can ensure that the printed Tyvek material has the characteristics of clear pattern, difficulty in decoloring and environmental friendliness.

In order to achieve the aim, the invention provides a Tewei water-based flexographic printing material which comprises the following raw material components in percentage by weight: 55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water; 35-45% of water-based color paste.

According to the aqueous flexographic printing material for tyvek, the content of the polyurethane resin was 65%.

According to the aqueous flexographic printing material for Tyvek, the content of the adhesion promoter is 3.5%.

According to the waterborne flexographic printing material for the Tyvek, the polyurethane resin is a waterborne polyurethane resin with the lowest film forming temperature of less than 5 ℃, and the waterborne polyurethane resin is ETERANE89216 and ETERANE89235 of Changxing Taiwan or WITCOBOND 362-02 and WITCOBOND 781 of Langsheng, Germany.

According to the waterborne flexographic printing material for the Tyvek, the acrylic resin is a waterborne acrylic resin with the lowest film forming temperature of less than 20 ℃, and the waterborne acrylic resin is JONCRYL 7256 or JONCRYL 74-A of Pasteur Germany.

According to the waterborne flexographic printing material for the Tyvek adhesive disclosed by the invention, the adhesion promoter is polyester polyol, and the defoaming agent is organic silicon or mineral oil defoaming agent.

According to the aqueous flexographic printing material for Tyvek, the wear-resisting agent is polyethylene wax, and the polyethylene wax is German Kelain wax 3620 or American Trifolium S-232.

According to the aqueous flexographic printing material for the Tyvek, the wetting agent is a sodium sulfosuccinate wetting agent.

According to the aqueous flexographic printing material for Tyvek, disclosed by the invention, the stabilizer is an organic amine, and the organic amine is isopropanolamine or triisopropanolamine or dimethylethanolamine or triethanolamine.

A method of preparing a composition using a tyvek aqueous flexographic printing material comprising the steps of:

A. preparation of the thinner: weighing polyurethane resin, acrylic resin, an adhesion promoter, a wear-resisting agent, a wetting agent, a stabilizer, a defoaming agent and deionized water according to a proportion, and uniformly mixing in a reaction kettle for later use;

B. and C, uniformly mixing the water-based color paste and the thinner in the step A, and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

The invention provides a water-based flexible printing material for Tyvek, which comprises the following raw material components in percentage by weight: 55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water; 35-45% of water-based color paste. The invention has the beneficial effects that: in the printing material composition, the polyurethane resin is used as the main resin and is compounded with the acrylic resin, so that compared with the single use of the acrylic resin or the polyurethane resin, the super-strong adhesive force, re-solubility and drying speed of the printing material are better improved, the drying speed is improved without adding a large amount of ethanol, and printing dots are clear and are not easy to paste. The polyester polyol adhesion promoter ensures that the ink layer has higher adhesion with Tyvek by the principle of similarity and intermiscibility, and is not easy to fade. The wear-resistant polyethylene wax can float to the surface layer of the printing ink in the drying film-forming process of the printing ink to improve the wear resistance and the smoothness of the ink layer, ensure that the printed Tyvek does not stick and decolor in the later use process, and the wetting agent can promote the printing ink to form a flat, smooth and uniform coating film in the drying film-forming process to improve the leveling property and the uniformity of the coating film. The organic amine stabilizer can ensure that the pH value of the water-based ink is kept in a reasonable range of 8-9 in the using process, and the stability of the performance of the ink is protected. The defoaming agent is used for effectively preventing the water-based ink from generating bubbles in the production and printing processes and eliminating the generated bubbles. The combination and percentage range ensure that an ink layer formed by the printing material composition has good adhesive force, re-solubility, wear resistance and drying speed, ensure that a pattern is clear, is not decolorized and is dried quickly when printing is carried out at Tyvek, and can completely replace the conventional high VOC solvent-based ink.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and it should be understood that the specific examples described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.

The invention provides a water-based flexible printing material for Tyvek, which comprises the following raw material components in percentage by weight: 55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water; 35-45% of water-based color paste.

Preferably, the content of the polyurethane resin of the present invention is 65%.

In addition, the content of the adhesion promoter is 3.5%.

Further, the polyurethane resin is aqueous polyurethane resin with the lowest film forming temperature less than 5 ℃, and the aqueous polyurethane resin is ETERANE89216 and ETERANE89235 of Taiwan Changxing or WITCOBOND 362-02 and WITCOBOND 781 of Langsheng, Germany.

More preferably, the acrylic resin provided by the invention is a water-based acrylic resin with the lowest film-forming temperature less than 20 ℃, and the water-based acrylic resin is JONCRYL 7256 or JONCRYL 74-A of Pasteur Germany.

In addition, the adhesion promoter is polyester polyol, and the defoaming agent is organic silicon or mineral oil defoaming agent.

Further, the anti-wear agent of the present invention is a polyethylene wax, which is german kraine wax 3620 or american clover S-232.

More preferably, the wetting agent of the present invention is a sodium sulfosuccinate wetting agent.

In addition, the stabilizer is organic amine, and the organic amine is isopropanolamine, triisopropanolamine, dimethylethanolamine or triethanolamine.

The first embodiment is as follows:

a water-based flexographic printing material for Tyvek: the composite material consists of the following raw materials in percentage by weight: 55% of thinner and 45% of water-based color paste; wherein the diluent consists of the following raw materials in percentage by weight: ETERANE 8921660%, JONCRYL 725626.5%, Pripol 1006F 3%, 36204%, wetting agent 1%, isopropanolamine 5%, and antifoaming agent 0.5%

The preparation method comprises the following steps: (1) preparation of the thinner: weighing polyurethane resin, acrylic resin, adhesion promoter, wear-resisting agent, wetting agent, stabilizer, defoaming agent and deionized water according to the above proportion, and uniformly mixing in a reaction kettle for later use;

(2) and (2) uniformly mixing the water-based color paste and the thinner in the step (1), and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

The printed material was then placed on a flexible board proofing press to produce a swatch which was tested for adhesion, resolubility and abrasion resistance, the results of which are listed in table 1.

Example 2

A water-based flexographic printing material for Tyvek: the composite material consists of the following raw materials in percentage by weight: 60% of thinner and 40% of water-based color paste; wherein the diluent consists of the following raw materials in percentage by weight: ETERANE 8923570%, JONCRYL 74-A16.5%, Priplast 19013%, S-2324%, wetting agent 1%, isopropanolamine 5%, and defoaming agent 0.5%

The preparation method comprises the following steps: (1) preparation of the thinner: weighing polyurethane resin, acrylic resin, adhesion promoter, wear-resisting agent, wetting agent, stabilizer, defoaming agent and deionized water according to the above proportion, and uniformly mixing in a reaction kettle for later use;

(2) and (2) uniformly mixing the water-based color paste and the thinner in the step (1), and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

The printed material was then placed on a flexible board proofing press to produce a swatch which was tested for adhesion, resolubility and abrasion resistance, the results of which are listed in table 1.

Example 3

A water-based flexographic printing material for Tyvek: the composite material consists of the following raw materials in percentage by weight: 65% of thinner and 35% of water-based color paste; wherein the diluent consists of the following raw materials in percentage by weight: ETERANE 8921680%, JONCRYL 72565%, Pripol 1006F 5%, 36204%, wetting agent 1%, triisopropanolamine 4.5%, antifoam 0.5%

The preparation method comprises the following steps: (1) preparation of the thinner: weighing polyurethane resin, acrylic resin, adhesion promoter, wear-resisting agent, wetting agent, stabilizer, defoaming agent and deionized water according to the above proportion, and uniformly mixing in a reaction kettle for later use;

(2) and (2) uniformly mixing the water-based color paste and the thinner in the step (1), and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

The printed material was then placed on a flexible board proofing press to produce a swatch which was tested for adhesion, resolubility and abrasion resistance, the results of which are listed in table 1.

Example 4

A water-based flexographic printing material for Tyvek: the composite material consists of the following raw materials in percentage by weight: 60% of thinner and 40% of water-based color paste; wherein the diluent consists of the following raw materials in percentage by weight: WITCOBOND 362-0260%, JONCRYL 725625%, Pripol 1006F 5%, S-2324%, wetting agent 1%, isopropanolamine 4.5%, and defoaming agent 0.5%

The preparation method comprises the following steps: (1) preparation of the thinner: weighing polyurethane resin, acrylic resin, adhesion promoter, wear-resisting agent, wetting agent, stabilizer, defoaming agent and deionized water according to the above proportion, and uniformly mixing in a reaction kettle for later use;

(2) and (2) uniformly mixing the water-based color paste and the thinner in the step (1), and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

The printed material was then placed on a flexible board proofing press to produce a swatch which was tested for adhesion, resolubility and abrasion resistance, the results of which are listed in table 1.

Example 5

A water-based flexographic printing material for Tyvek: the composite material consists of the following raw materials in percentage by weight: 65% of thinner and 35% of water-based color paste; wherein the diluent consists of the following raw materials in percentage by weight: WITCOBOND 78160%, JONCRYL 74-A25%, Pripol 10065%, 36204%, wetting agent 1%, triethanolamine 4.5%, and defoaming agent 0.5%

The preparation method comprises the following steps: (1) preparation of the thinner: weighing polyurethane resin, acrylic resin, adhesion promoter, wear-resisting agent, wetting agent, stabilizer, defoaming agent and deionized water according to the above proportion, and uniformly mixing in a reaction kettle for later use;

(2) and (2) uniformly mixing the water-based color paste and the thinner in the step (1), and then grinding the mixture by using a sand mill until the fineness is less than or equal to 5 mu m to obtain the water-based color paste.

Then, the printing material is prepared into a sample sheet on a flexible plate proofing machine, and the adhesive force, the redissolution property and the wear resistance of the sample sheet are tested.

The test indexes of the aqueous flexographic printing materials for tyvek strength obtained in examples 1 to 5 are shown in the following table:

the conditions for the adhesion test were: reference is made to GB/T9286 1998 test of the marking of paint and varnish films. After the coating film is dried, the coating film is subjected to grid drawing by using a hundred grid knife, the coating film is adhered to the surface of the coating film by using an adhesive tape, the adhesive tape is torn off at an angle of 60 degrees as much as possible, the number of grids falling off is counted, and the retention ratio is calculated. 100% was no shedding, optimal, 0% was complete shedding, worst.

The conditions for the resolubility test were: after the printing sample sheet is placed for 10 minutes at room temperature, a drop of the same ink sample is placed on the printing surface for 10 seconds, then the printing surface is slowly washed by water, the decolorization condition of the ink layer under the ink drop is observed, the ink layer is excellent in total dissolution and shedding, good in 50 percent shedding and poor in non-shedding.

The conditions for the rub resistance test were: rub resistance tester, rub speed: 106 times/min, friction load: 2LB, rubbing time: for 1 minute.

Item	Example 1	Example 2	Example 3	Example 4	Example 5
						Adhesion test	100％	100％	100％	100％	100％
Resolubility test	Superior food	Superior food	Superior food	Superior food	Superior food
						Rub resistance test	The sample has no exposed white	The sample has no exposed white	The sample has no exposed white	The sample has no exposed white	The sample has no exposed white

In conclusion, the invention provides a waterborne flexographic printing material with Tyvek strength, which comprises the following raw material components in percentage by weight: 55-65% of a diluent, wherein the diluent comprises the following raw material components in percentage by weight: 60-80% of polyurethane resin, 0-35% of acrylic resin, 1-5% of adhesion promoter, 1-4% of wear-resisting agent, 0-1% of wetting agent, 0-8% of stabilizer, 0.1-0.5% of defoaming agent and 30-40% of deionized water; 35-45% of water-based color paste. The invention has the beneficial effects that: in the printing material composition, the polyurethane resin is used as the main resin and is compounded with the acrylic resin, so that compared with the single use of the acrylic resin or the polyurethane resin, the super-strong adhesive force, re-solubility and drying speed of the printing material are better improved, the drying speed is improved without adding a large amount of ethanol, and printing dots are clear and are not easy to paste. The polyester polyol adhesion promoter ensures that the ink layer has higher adhesion with Tyvek by the principle of similarity and intermiscibility, and is not easy to fade. The wear-resistant polyethylene wax can float to the surface layer of the printing ink in the drying film-forming process of the printing ink to improve the wear resistance and the smoothness of the ink layer, ensure that the printed Tyvek does not stick and decolor in the later use process, and the wetting agent can promote the printing ink to form a flat, smooth and uniform coating film in the drying film-forming process to improve the leveling property and the uniformity of the coating film. The organic amine stabilizer can ensure that the pH value of the water-based ink is kept in a reasonable range of 8-9 in the using process, and the stability of the performance of the ink is protected. The defoaming agent is used for effectively preventing the water-based ink from generating bubbles in the production and printing processes and eliminating the generated bubbles. The combination and percentage range ensure that an ink layer formed by the printing material composition has good adhesive force, re-solubility, wear resistance and drying speed, ensure that a pattern is clear, is not decolorized and is dried quickly when printing is carried out at Tyvek, and can completely replace the conventional high VOC solvent-based ink.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.