Ink-absorbing membrane material suitable for water-based pigment ink-jet printing as well as preparation method and application of ink-absorbing membrane material

Abstract

The invention discloses an ink-absorbing membrane material suitable for water-based pigment ink-jet printing and a preparation method and application of the ink-absorbing membrane material. The membrane material comprises a PVC base material with low plasticizer content and an ink-absorbing coating attached to the PVC base material, the ink-absorbing coating comprises water-based polymer resin, ink-absorbing filler, a dispersing agent, a cationic color fixing agent, heat-sensitive polymer filler, thermoplastic polymer resin and other auxiliaries. According to the invention, the PVC film is used, and the water-based pigment ink-absorbing coating is coated in a coating mode; an Epson water-based ink printer commonly used in the market is adopted for printing, and the ink-absorbing film material suitable for water-based pigment ink-jet printing, which is good in water resistance and scratch resistance, high in adhesive force, excellent in printed image fidelity, high in anti-aging stability and good to the environment, is obtained by performing hot-pressing compounding on the ink-absorbing film material and a PVC transparent film. The high-standard requirement that building materials can be used for more than 25 years can be met.

Description

Technical Field

[0001] The invention relates to an ink-absorbing film material suitable for water-based pigment inkjet printing and a preparation method and application thereof, belonging to the technical field of decorative printing consumables. Background Art

[0002] There are various printed film materials with different patterns on the market, such as PVC and PP color printed film materials, commonly known as "color films". The largest amount of PVC film materials are used. This type of PVC film is formed into PVC color films with various patterns through traditional oil plate printing. The color film is then hot-pressed and compounded with the upper PVC protective film and the lower stone plastic board (Stone Plastic Composite, referred to as SPC) and other basic boards at high temperature to generate various indoor and outdoor decorative materials with exquisite patterns, including but not limited to floor and wall decorative boards, furniture panels, stage backgrounds and various advertising panels. Due to the advantages of light weight, waterproof and moisture-proof, flame retardant and easy installation, this type of product has been highly valued by people from all walks of life. It is used to replace various decorative materials such as stone, ceramics, and wood. The estimated market size exceeds one trillion yuan.

[0003] In recent years, people still found the following serious problems in the process of using the above traditional color films:

[0004] 1. There are a lot of toxic volatile organic compounds (VOCs) in the traditional ink printing process. The pre- and post-printing processing produces a lot of harmful organic solvents and colorants, which pollute the environment and harm human health.

[0005] 2. Different ink printing methods require the production of rollers and plates with various patterns. Once they are not recognized by customers, they can no longer be used, resulting in a large backlog and waste of plate-making materials for various manufacturers, and the final product use cost remains high;

[0006] 3. Traditional ink plate-making printing requires a minimum order quantity of tens of thousands of pieces to avoid losses, which cannot meet the growing market demand for personalization and small-batch customization;

[0007] 4. With the rapid development of digital printing and printing machinery, people's demand for high-definition, image-level and durable images is getting higher and higher, while traditional printing methods and products can hardly meet such requirements.

[0008] Therefore, the development of special color films that match inkjet printing machines using water-based pigment inks has become the preferred technical solution to solve the above problems. At present, the water-based inks used in various inkjet printers and inkjet printers on the market are mainly divided into two types: water-based dyes and pigments. Water-based dyes are mainly used indoors and for short-term use due to their low cost and fast fading; while water-based pigments are more expensive but the color can be maintained for a long time, and can be used indoors and outdoors and in situations where long-term image stability is required.

[0009] In addition to being used in conjunction with the above-mentioned water-based color inkjet ink, the film material involved in the present invention also has the following requirements:

[0010] 1. Preparation of ink-absorbent coating on PVC film with low plasticizer content

[0011] The coating is formed by coating on the surface of PVC and other film substrates by a coating machine, and has the requirements of good ink absorption effect, high printing image precision, high temperature resistance and image stability after printing;

[0012] 2. Good compatibility with printing ink

[0013] The above-mentioned coated film material should be matched with the high temperature resistant and viscosity enhancing ink on the market, so as to have the characteristics of high definition image, good bonding between ink and coating, and high bonding when compounded with composite film at high temperature;

[0014] 3. Good hot pressing composite properties with surface composite film and bottom panel material

[0015] The printed color film can be hot-pressed with the surface coating material (such as PVC) and the bottom panel material (such as SPC board) at 160-200°C. The generated material with various high-precision images can maintain a shelf life of more than 25 years. Summary of the invention

[0016] The purpose of the present invention is to solve the defects of existing products on the market and provide an ink-absorbing film material suitable for water-based pigment inkjet printing, which not only meets the quality requirements of existing water-based inkjet printers and inks for high-precision printing, but also meets the requirements for maintaining product stability during high-temperature compounding of the printed color film with the surface composite film and the bottom panel material and after compounding.

[0017] Another object of the present invention is to provide a method for preparing the above-mentioned membrane material.

[0018] The third object of the present invention is to provide an application of the above-mentioned film material.

[0019] The objective of the present invention is achieved through the following technical solutions:

[0020] An ink-absorbing film material suitable for water-based pigment inkjet printing, characterized by comprising a PVC substrate and an ink-absorbing coating attached to the PVC substrate.

[0021] The PVC substrate in the present invention is a PVC film with a low plasticizer content, preferably with a density of 1.35-1.50 g / m 3 PVC film, PVC substrate preferably has a gram weight of 70-200g / m 2 , thickness 50-170μm.

[0022] The ink-absorbing coating of the present invention comprises the following components in parts by weight:

[0023]

[0024]

[0025] The ink-absorbing coating of the present invention preferably comprises the following components in parts by weight:

[0026]

[0027] The ink-absorbing filler in the present invention is one or more of special silicon dioxide, diatomaceous earth and alumina (including aluminate type); the cationic color fixing agent is one or two of cationic polymer resin and cationic polymer resin dispersion; the thermosensitive polymer filler is a modified thermosensitive polymer resin spherical body, including but not limited to polyvinyl chloride, polyurethane and amphiphilic copolymer; the water-based polymer resin is one or more of modified polyvinyl alcohol, gelatin, starch polymer, cellulose polymer, ethoxy ether polymer; the thermoplastic polymer resin is one or more of modified thermoplastic polyurethane dispersion, thermoplastic polyolefin elastomer, polyethylene-vinyl acetate and polyethylene-ethyl acrylate; other additives refer to defoamers, leveling agents, preservatives, thickeners and cross-linking agents commonly used in water-based coatings.

[0028] The ink-absorbing slurry used for the ink-absorbing coating in the present invention is prepared by the following method:

[0029] Add dispersant to water, add ink-absorbing filler under high-speed stirring at 2000-3000 rpm, and after uniform dispersion, add cationic color fixative, heat-sensitive polymer filler, thermoplastic polymer resin and water-based polymer resin in sequence under stirring at 300-500 rpm, and then add appropriate amount of defoamer, thickener and leveling agent, stir and mix evenly, filter with 120-200 mesh filter, and let stand for several hours before use. Among them, the solid content of the ink-absorbing coating is 20-40%, the viscosity at 25℃±2℃ is 50-800cps, and the coating amount is 3-20g / m 2 .

[0030] A method for preparing the above-mentioned ink-absorbing film material, using one or more of the wire rod, gravure, curtain and spray coating methods to coat the ink-absorbing slurry on the surface of the PVC film, with a coating dry weight of 3-20g / m 2 The drying temperature of coating is 50-80℃, and the film material after drying is the ink-absorbing film material.

[0031] Preferably, the PVC film coated with the ink-absorbing slurry is dried in a 30-50 m long oven, and the production speed is 10-60 m / min.

[0032] An application of the above-mentioned ink-absorbing film material is characterized in that an Epson water-based ink printer is used to print patterns on the film material to form a color film, the water-based pigment ink is a thermoplastic 4-8 color water-based pigment ink, and the configuration conditions of the color inkjet printer are: 6-12S3200 type nozzles, and the printing speed is 2-30m / min.

[0033] For further application, the printed PVC color film is compounded with PVC transparent film on one side and SPC stone plastic board containing PVC on the other side under high temperature and pressure. The compounding temperature is 160-200℃, the pressure is 3-5Mpa, and the pressing time is 30-50s.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] (1) There are no toxic volatile organic compounds (VOCs) in the production process, and the product does not produce organic solvents and harmful substances after use, thereby improving the environment and benefiting human health;

[0036] (2) Plateless printing can be used to solve the problem of large backlog and waste of plate-making materials of various manufacturers;

[0037] (3) Customers can customize their products without having to meet a large minimum order, achieving low cost, high efficiency, fast delivery, and a wide variety of styles;

[0038] (4) The printing accuracy and quality exceed any traditional printing, and the shelf life reaches and exceeds the existing building materials standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1-8 They correspond to the printing test images of Examples 1-8 respectively. DETAILED DESCRIPTION

[0040] An ink-absorbing film material suitable for water-based pigment inkjet printing comprises a PVC substrate and an ink-absorbing coating attached to the PVC substrate, wherein the ink-absorbing coating comprises the following components in parts by weight:

[0041]

[0042] The preferred density of PVC substrate is 1.35-1.5g / m 3 , weight 70-200g / m 2 , PVC film with thickness of 50-170μm.

[0043] The slurry preparation method of the ink-absorbing coating is as follows:

[0044] The dispersant is added into water, and the ink-absorbing filler is added under high-speed stirring at 2000-3000 rpm. After being evenly dispersed, the cationic color fixing agent, the heat-sensitive polymer filler, the thermoplastic polymer resin and the water-based polymer resin are added in sequence under stirring at 300-500 rpm, and then an appropriate amount of defoamer, thickener and leveling agent are added. After being stirred and mixed evenly, the mixture is filtered through a 120-200 mesh filter and allowed to stand for several hours before use. The obtained ink-absorbing coating has a solid content of 20-40% and a viscosity (25°C±2°C) of 50-800cps.

[0045] The preparation method of the film material of the present invention is: the ink-absorbing slurry is coated on the surface of the PVC film by one or more of the wire rod, gravure, curtain and spray coating methods, the coating drying temperature is 50-80°C, the coating dry weight is 3-20g / m 2 .

[0046] The present invention is further described in detail below with reference to specific embodiments.

[0047] The substrate of Examples 1-8 is a PVC film with a low plasticizer content of 90 g / m2 and a thickness of 70 μm. The contents of the components of the ink-absorbing coating are shown in Table 1.

[0048] Table 1: The contents of each component in Examples 1-8 are in parts by mass

[0049] Example 1 2 3 4 5 6 7 8 Ethoxylated ether polymers 20 30 — — 10 40 — 30 Modified polyvinyl alcohol — — 20 30 20 — 5 30 Silicon dioxide 20 30 20 — 40 — 60 — diatomite — — 10 30 — — — 10 Alumina — — — — — 30 — — Dispersants 0.5 0.5 0.6 0.8 1.5 0.8 2.5 0.1 Cationic fixing agent 20 20 20 20 30 40 10 1 Heat sensitive polymer filler 120 100 120 120 100 80 120 100 Thermoplastic polymer resin 60 80 100 120 120 120 10 50 Other additives 2 2 2 2 2 2 5 2 water 370 370 370 370 370 370 370 200

[0050] The materials of the thermoplastic modified polymer resin in Examples 1-8 are as follows:

[0051] Example 1: Modified thermoplastic polyurethane dispersion;

[0052] Example 2: Thermoplastic polyolefin elastomer;

[0053] Example 3: 1:1 mixture of modified thermoplastic polyurethane dispersion and polyethylene-vinyl acetate;

[0054] Example 4: polyethylene-vinyl acetate; Example 5: polyethylene-ethyl acrylate;

[0055] Example 6: A 1:1 mixture of polyethylene-vinyl acetate and polyethylene-ethyl acrylate;

[0056] Example 7: a 2:1 mixture of a thermoplastic polyolefin elastomer and polyethylene-ethyl acrylate; Example 8: a 1:1 mixture of a modified thermoplastic polyurethane dispersion and a thermoplastic polyolefin elastomer.

[0057] The preparation method of Examples 1-8 is:

[0058] Preparation of ink absorbing slurry:

[0059] Add water and dispersant to a high-speed dispersing tank, stir at a speed of 2000-3000RPM for 5 minutes, add ink-absorbing filler, and then disperse at a speed of 2000-3000RPM for 30 minutes to disperse evenly, reduce the speed to 300-500RPM, add cationic color fixing agent, thermosensitive polymer filler, thermoplastic polymer resin and water-based polymer resin in sequence, mix for 30 minutes, add other additives, stir and mix evenly, let stand for 2 hours, and then filter with 200 mesh and 120 mesh filter screens to obtain an ink-absorbing coating;

[0060] Preparation of ink-absorbing membrane:

[0061] Apply ink-absorbing coating on PVC substrate, and the coating amount is controlled at 20g / m 2 , and then heated and dried in an oven at 80° C., and after being completely dried, the PVC ink-absorbing film material of the present invention is obtained.

[0062] The ink-absorbing film materials of Examples 1-8 are respectively used to prepare color films and are hot-pressed and composited with SPC stone plastic boards to form decorative boards. The specific application method is as follows:

[0063] An Epson water-based ink printer (containing 6-12 S3200 type printheads) and 4-8 color water-based pigment inks with thermoplasticity are used to print color patterns to obtain a PVC color film;

[0064] The PVC color film, 50 g / m2 PVC transparent film (upper protective film of the PVC color film) and SPC stone plastic board (bottom substrate of the PVC color film) were pressed at 180° C. and 4 MPa pressure for 40 seconds to obtain a decorative board.

[0065] The decorative panels prepared from the films of Examples 1-8 were tested.

[0066] Hot pressing composite test: The peeling force between the color film of the decorative sheet material of Examples 1-8 and the upper PVC transparent film was tested. The test method was carried out according to the provisions of 6.9 of GB / T 11982.1-2015. The samples were taken regardless of grade. The peeling force reached the standard value of ≥70N, and the test sample width was 5cm.

[0067] Water resistance test: The PVC color film decorative panels of Examples 1-8 were immersed in 60°C water for 12 hours, and the peeling force between the PVC color film and the PVC transparent film was tested according to the provisions of 6.9 of the national standard GB / T 11982.1-2015. The peeling force was compared with that of the sample before the water resistance test. The smaller the decrease, the better the water resistance.

[0068] The printing quality of the color films prepared in Examples 1-8 was evaluated according to GB / T36598-2018.

[0069] The test results of printing quality and peeling force of composite materials are shown in Table 2.

[0070] Table 2:

[0071] project Print Color Initial peeling force / N Peel strength after 12h water resistance at 60℃ / N Example 1 Clear lines and uniform colors 76 65 Example 2 Clear lines and uniform colors 75 65 Example 3 Clear lines and uniform colors 78 70 Example 4 Clear lines and uniform colors 75 66 Example 5 Clear lines and uniform colors 77 68 Example 6 Clear lines and uniform colors 74 65 Example 7 Clear lines and uniform colors 40 34 Example 8 Line Diffusion 70 40 .

Claims

1. An ink-absorbing film material suitable for water-based pigment inkjet printing, characterized in that: The invention comprises a PVC substrate and an ink-absorbing coating layer coated on the PVC substrate.

2. The ink-absorbing film material suitable for water-based pigment inkjet printing according to claim 1, characterized in that The PVC substrate has a density of 1.35-1.50 g / m 3 , weight 70-200g / m 2 , PVC film with thickness of 50-170μm.

3. The ink-absorbing film material suitable for water-based pigment inkjet printing according to claim 1, characterized in that The ink-absorbing coating comprises the following components in parts by weight:

4. The ink-absorbing film material suitable for water-based pigment inkjet printing according to claim 3, characterized in that The ink-absorbing filler is one or more of special silicon dioxide, diatomaceous earth and alumina (including aluminate type); the cationic color fixing agent is one or two of cationic polymer resin and cationic polymer resin dispersion; the thermosensitive polymer filler is a modified thermosensitive polymer resin sphere, including but not limited to polyvinyl chloride, polyurethane and amphiphilic copolymer; the water-based polymer resin is one or more of modified polyvinyl alcohol, gelatin, starch polymer, cellulose polymer, ethoxy ether polymer; the thermoplastic polymer resin is one or more of modified thermoplastic polyurethane dispersion, thermoplastic polyolefin elastomer, polyethylene-vinyl acetate and polyethylene-ethyl acrylate.

5. The ink-absorbing film material suitable for water-based pigment inkjet printing according to claim 3, characterized in that The ink-absorbing slurry of the ink-absorbing coating is prepared by the following method: Add dispersant into water, add ink-absorbing filler under high-speed stirring at 2000-3000 rpm, and after uniform dispersion, add cationic color fixing agent, heat-sensitive polymer filler, thermoplastic polymer resin and water-based polymer resin in sequence under stirring at 300-500 rpm, and then add other additives. After stirring and mixing evenly, filter through a 120-200 mesh filter and let stand for several hours before use.

6. The ink-absorbing film material suitable for water-based pigment inkjet printing according to claim 5, characterized in that The ink-absorbing coating has a solid content of 20-40%, a viscosity of 50-800 cps at 25°C ± 2°C, and a coating weight of 3-20 g / m 2 .

7. A method for preparing the ink-absorbing film material according to any one of claims 1 to 6, characterized in that Use one or more of the wire rod, gravure, curtain and spray coating methods to apply the ink-absorbing slurry on the surface of the PVC film, with a dry coating weight of 3-20g / m 2 , the drying temperature of coating is 50-80℃.

8. The method for preparing the ink-absorbing film according to claim 7, characterized in that The PVC film coated with the ink-absorbing slurry is dried in a 30-50m long oven, and the production speed is 10-60m / min.

9. An application of the ink-absorbing film material according to any one of claims 1 to 6, characterized in that The Epson water-based ink printer is used to print patterns on the film material to form a color film. The water-based pigment ink is a thermoplastic 4-8 color water-based pigment ink. The configuration conditions of the color inkjet printer are: 6-12S3200 type nozzles, and the printing speed is 2-30m / min.

10. An application of the ink-absorbing film material according to claim 9, characterized in that The PVC color film with printed patterns is compounded on one side with the PVC transparent film and on the other side with the SPC stone plastic board containing PVC under high temperature and pressure. The compounding temperature is 160-200℃, the pressure is 3-5Mpa, and the pressing time is 30-50s.

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