Process for printing white plus color on softwood

Abstract

The present application relates to the technical field of softwood printing method, and particularly relates to a process method for printing white color and color on softwood. The softwood substrate is soaked in a preservative treatment solution, so that the preservative components are dispersed in the voids of the softwood substrate, so that the prepared preservative softwood after treatment has relatively stable preservative performance and is not easily corroded by acid and alkali. In addition, the soaking in the preservative treatment solution can fill the pore size on the surface of the softwood substrate, so as to prevent the phenomenon of pigment penetration after subsequent color printing. The white ink and color ink are printed on the softwood after the preservative treatment in a spraying manner, so as to improve the adhesion performance of the pigment and prevent the pigment from falling off. Finally, a transparent protective solution is prepared by using modified silicon dioxide and water-based fluorocarbon emulsion resin as raw materials, so as to play a role of color fixing and wear resistance, and prevent the sprayed pigment from falling off from the softwood.

Description

Technical Field

[0001] The invention relates to the technical field of cork printing methods, and in particular to a process for printing white and colored images on cork. Background Art

[0002] Cork, also known as cork, is a parenchyma tissue that develops from the cork cambium of the trunks and branches of Quercus variabilis and Castanopsis variabilis trees. Cork products are increasingly used in industries ranging from furniture to construction to aerospace, and from indoor to outdoor applications. The demand for their performance is also increasing. Currently, many cork-based crafts are available on the market. During the production process, different colors of pigments are applied to the cork surface. However, the surface painting of cork crafts is mostly handmade, which is labor-intensive. If different colors could be applied to the surface of pre-cut cork using a printing-like method, it would save labor and time.

[0003] Because cork is soft and susceptible to corrosion and wear, it needs to be treated with an anti-corrosion treatment before painting, and then different types of pigments need to be spray-printed on the cork surface. The existing process of treating cork with an anti-corrosion treatment before spray-printing is not mature enough. Therefore, how to design a process for printing white and colored on cork so that the printed pigments are not easy to fall off has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] Technical problems solved

[0005] In response to the above-mentioned shortcomings of the prior art, the present invention provides a process for printing white and colored on cork, aiming to print different pigments on cork after antiseptic treatment by inkjet printing, and making the printed pigments not easy to fall off.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A process for printing white and color on cork, the process comprising the following steps:

[0009] Step 1. After the cork material is pre-treated and sanded to the required thickness using a sanding machine, it is cut into appropriate sizes, and the resulting material is recorded as the cork substrate;

[0010] Step 2, soaking the cork substrate in the antiseptic treatment solution for 2-3 hours, draining it, and then drying it at a temperature of 55-58°C for 8-12 hours. The obtained product is recorded as the antiseptic cork;

[0011] Step 3: Pour the white pigment and the color pigment into the homemade ink solvent respectively to prepare white ink and color ink, spray them on the surface of the antiseptic cork by spray printing, and dry them at a temperature of 35-40°C for 5-10 minutes;

[0012] Step 4: Prepare a transparent protective solution using modified silica and water-based fluorocarbon emulsion resin as raw materials. Apply the transparent protective solution to the surface of the antiseptic cork that has been treated in Step 3 and spray-printed with pigment. Finally, cure it with ultraviolet light to obtain cork printed with white and color.

[0013] Furthermore, the specific method of the pretreatment in Step 1 is: after removing the black skin on the surface of the cork, place it in boiling water and cook it for 8-10 minutes to soften it. After softening, take it out, drain it and dry it at a temperature of 55-60°C for 12-24 hours.

[0014] Furthermore, the preparation method of the antiseptic treatment solution in Step 2 is:

[0015] S1. Weigh 5-6 parts by weight of basic copper carbonate, 5-6 parts by weight of basic zinc carbonate, 1-2 parts by weight of ammonium citrate, and 180-200 parts by weight of deionized water, mix them, heat to 25° C., adjust the pH to 7-8 with aqueous ammonia, and then grind them in a ball mill. The resultant mixture is recorded as a nano-modified component.

[0016] S2, weighing 30-40 parts by weight of deionized water, 1-2 parts by weight of dodecylphenol polyoxyethylene ether, 0.5-1 parts by weight of sodium lauryl sulfate, 10-11 parts by weight of methyl methacrylate, 7-9 parts by weight of butyl acrylate and 7-8 parts by weight of isooctyl acrylate, mixing and stirring, then heating to 80° C. for pre-emulsification for 30 minutes, and then adding 2-3 parts by weight of potassium persulfate solution dropwise, the resultant is recorded as seed emulsion;

[0017] S3, adding 2-3 parts by weight of potassium persulfate solution, 6-8 parts by weight of methyl methacrylate, 5-6 parts by weight of butyl acrylate, 4-5 parts by weight of isooctyl acrylate and 5-8 parts by weight of silane coupling agent-570 to the seed emulsion, mixing and stirring, reacting at a temperature of 80° C. for 2-3 hours, and cooling to room temperature to obtain a silicon-containing acrylate emulsion;

[0018] S4. Mix the nano-modified component in S1 and the silicon-containing acrylate emulsion in S3 in a weight ratio of 2:1, stir at a stirring speed of 500-600 r / min for 5-8 minutes, and then subject to ultrasonic dispersion at a frequency of 25-26 kHz for 8-10 minutes to obtain an anti-corrosion treatment solution.

[0019] Furthermore, the grinding speed in S1 is 3500 r / min, and the grinding time is 1-2 h.

[0020] Furthermore, the mixing and stirring in S2 and S3 is carried out at a stirring speed of 100-200 r / min and for a stirring time of 5-8 min.

[0021] Furthermore, the preparation method of the homemade ink solvent in Step 3 is: mixing propylene glycol methyl ether propionate and vinyl chloride vinyl acetate copolymer in a volume ratio of 3:1, stirring at a stirring speed of 300-400 r / min for 10-15 minutes, and the result is the homemade ink solvent.

[0022] Furthermore, the preparation method of the white ink in Step 3 is as follows: 90-95 parts of homemade ink solvent, 5-6 parts of white pigment and 1-2 parts of dispersant are weighed in parts by weight and poured into a ball mill for ball milling. The ball milling speed is 400-500 r / min and the ball milling time is 22-24 hours. After ball milling, the result is passed through a 200-mesh sieve to obtain white ink; the white pigment is talc and titanium dioxide powder mixed in equal weight ratios and then ground through a 200-mesh sieve. The dispersant model is DISPERBYK-116.

[0023] Furthermore, the preparation method of the colored ink in Step 3 is: 90-95 parts of homemade ink solvent, 5-6 parts of color pigment and 1-2 parts of dispersant are weighed in parts by weight and poured into a ball mill for ball milling. The ball milling speed is 400-500r / min, the ball milling time is 22-24h, and the obtained color ink is passed through a 200-mesh sieve after ball milling; the color pigments are magenta pigment of model MAGENTA5B-K, cyan pigment of model BLUE4G-K, yellow pigment of model YELLOW4G-K and black pigment of model BLACKC-K, and the dispersant model is DISPERBYK-9076.

[0024] Furthermore, the method for preparing the transparent protective solution in Step 4 includes the following steps:

[0025] Step 1, adding 5-8 parts by weight of nano-silica to 50 parts by weight of toluene, ultrasonically dispersing at a frequency of 23-25 ​​kHz for 1 minute, adding 3-5 parts by weight of a silane coupling agent, ultrasonically dispersing at the original frequency for 25-30 minutes, filtering, washing the precipitate three times with deionized water, drying at a temperature of 45-48° C. for 8-10 hours, and grinding through a 200-mesh sieve to obtain the modified silica;

[0026] Step 2: Disperse the modified silica into the aqueous fluorocarbon emulsion resin at a weight ratio of 3-5%, stir at a stirring speed of 2200-2300 r / min for 35-40 minutes, add xylene to adjust the viscosity to meet the standard of GB1723-79, and the result is a transparent protective solution. The viscosity meets the standard of GB1723-79

[0027] Furthermore, the UV curing time in Step 4 is 25-30 seconds.

[0028] Beneficial effects

[0029] The present invention provides a process for printing white and colored images on cork. Compared with the existing known technology, the present invention has the following beneficial effects:

[0030] 1. The present invention prepares nano-modified components using basic copper carbonate and basic zinc carbonate as raw materials through a wet ball grinding method, and then mixes the nano-modified components with a silicon-containing acrylate emulsion for modification, thereby obtaining an anti-corrosion treatment solution with stable anti-corrosion performance. Immersing a cork substrate in the anti-corrosion treatment solution can disperse the anti-corrosion components in the gaps of the cork substrate, so that the anti-corrosion cork obtained after treatment has relatively stable anti-corrosion performance and will not be easily corroded by acids and alkalis. Moreover, after being immersed in the anti-corrosion treatment solution, the pores on the surface of the cork substrate can be filled, thereby preventing the phenomenon of pigment bleeding after subsequent printing and coloring.

[0031] 2. The present invention first uses propylene glycol methyl ether propionate as a solvent to mix vinyl chloride and vinyl acetate copolymer to prepare a homemade ink solvent, and then adds pigments of different colors and corresponding dispersants to prepare white ink and color ink. The white ink and color ink are then printed on cork after anti-corrosion treatment by inkjet printing, which can improve the adhesion performance of the pigment and prevent it from falling off easily. Finally, a transparent protective solution made of modified silica and water-based fluorocarbon emulsion resin as raw materials is applied to the surface of the pigment, which can play a role in color fixation and wear resistance, and prevent the printed pigment from falling off the cork. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Example 1

[0035] A process for printing white and color on cork in this embodiment includes the following steps:

[0036] Step 1. After the cork material is pre-treated and sanded to the required thickness using a sanding machine, it is cut into appropriate sizes. The resulting material is recorded as the cork substrate.

[0037] The specific method of pretreatment in Step 1 is as follows: after removing the black skin on the surface of the cork, place it in boiling water and steam it for 8 minutes to soften it. After softening, take it out, drain it, and dry it at a temperature of 55° C. for 12 hours.

[0038] Step 2: Soak the cork substrate in the antiseptic treatment solution for 2 hours, drain it, and then dry it at 55°C for 8 hours. The obtained product is recorded as antiseptic cork.

[0039] The preparation method of the antiseptic treatment solution in Step 2 is as follows:

[0040] S1. Weigh 5 parts by weight of basic copper carbonate, 5 parts by weight of basic zinc carbonate, 1 part by weight of ammonium citrate, and 180 parts by weight of deionized water, mix them, heat them to 25° C., adjust the pH to 7 with aqueous ammonia, and then pour them into a ball mill and grind them at a speed of 3500 r / min for 1 hour. The resultant is recorded as a nano-modified component;

[0041] S2, weighing 30 parts by weight of deionized water, 1 part by weight of dodecylphenol polyoxyethylene ether, 0.5 parts by weight of sodium lauryl sulfate, 10 parts by weight of methyl methacrylate, 7 parts by weight of butyl acrylate and 7 parts by weight of isooctyl acrylate, mixing and stirring at a mixing speed of 100 r / min for 5 min, then heating to 80° C. for pre-emulsification for 30 min, and then adding 2 parts by weight of potassium persulfate solution dropwise, the resultant is recorded as seed emulsion;

[0042] S3, adding 2 parts by weight of potassium persulfate solution, 6 parts by weight of methyl methacrylate, 5 parts by weight of butyl acrylate, 4 parts by weight of isooctyl acrylate and 5 parts by weight of silane coupling agent-570 to the seed emulsion and mixing them at a mixing speed of 100 r / min for 5 min, reacting at a temperature of 80° C. for 2 h, and cooling to room temperature to obtain a silicon-containing acrylate emulsion;

[0043] S4. Mix the nano-modified component in S1 and the silicon-containing acrylate emulsion in S3 in a weight ratio of 2:1, stir at a stirring speed of 500 r / min for 5 minutes, and then subject to ultrasonic dispersion at a frequency of 25 kHz for 8 minutes to obtain an anti-corrosion treatment solution.

[0044] Step 3: Pour the white pigment and the color pigment into the homemade ink solvent respectively and mix them to prepare white ink and color ink. After mixing, spray them on the surface of the antiseptic cork by spray printing and dry them at a temperature of 35°C for 5 minutes.

[0045] The preparation method of the homemade ink solvent in Step 3 is as follows: propylene glycol methyl ether propionate and vinyl chloride vinyl acetate copolymer are mixed in a volume ratio of 3:1, and stirred at a stirring speed of 300 r / min for 10 minutes to obtain the homemade ink solvent;

[0046] The preparation method of white ink in Step 3 is as follows: 90 parts of homemade ink solvent, 5 parts of white pigment and 1 part of dispersant are weighed by weight and poured into a ball mill for ball milling at a speed of 400 r / min for 22 hours. The obtained product is sieved through a 200-mesh sieve to obtain white ink; the white pigment is prepared by mixing talc and titanium dioxide powder in equal weight ratios and grinding them through a 200-mesh sieve; the dispersant model is DISPERBYK-116;

[0047] The preparation method of the colored ink in Step 3 is as follows: 90 parts of homemade ink solvent, 5 parts of color pigments and 1 part of dispersant are weighed according to weight, poured into a ball mill for ball milling, the ball milling speed is 400 r / min, the ball milling time is 22 hours, and the obtained color ink is passed through a 200-mesh sieve; the color pigments are magenta pigment model MAGENTA5B-K, cyan pigment model BLUE4G-K, yellow pigment model YELLOW4G-K and black pigment model BLACKC-K, and the dispersant model is DISPERBYK-9076.

[0048] Step 4: Prepare a transparent protective solution using modified silica and water-based fluorocarbon emulsion resin as raw materials. Apply the transparent protective solution to the surface of the antiseptic cork that has been treated in Step 3 and spray-printed with pigment. Finally, cure it with UV light for 25 seconds to obtain a cork printed with white and color.

[0049] The method for preparing the transparent protective solution in Step 4 includes the following steps:

[0050] Step 1, adding 5 parts by weight of nano-silica to 50 parts by weight of toluene, ultrasonically dispersing at a frequency of 23 kHz for 1 minute, adding 3 parts by weight of a silane coupling agent, ultrasonically dispersing at the original frequency for 25 minutes, filtering, washing the precipitate three times with deionized water, drying at a temperature of 45°C for 8 hours, and grinding through a 200-mesh sieve to obtain the modified silica;

[0051] Step 2: Disperse the modified silica in a water-based fluorocarbon emulsion resin at a weight ratio of 3%, stir at a stirring speed of 2200 r / min for 35 minutes, add xylene to adjust the viscosity to meet the standard of GB1723-79, and obtain a transparent protective solution.

[0052] Example 2

[0053] A process for printing white and color on cork in this embodiment includes the following steps:

[0054] Step 1. After the cork material is pre-treated and sanded to the required thickness using a sanding machine, it is cut into appropriate sizes. The resulting material is recorded as the cork substrate.

[0055] The specific method of pretreatment in Step 1 is as follows: after removing the black skin on the surface of the cork, place it in boiling water and steam it for 10 minutes to soften it. After softening, take it out, drain it, and dry it at a temperature of 60° C. for 24 hours.

[0056] Step 2: Soak the cork substrate in the antiseptic treatment solution for 3 hours, drain it, and then dry it at 58°C for 12 hours. The obtained product is recorded as antiseptic cork.

[0057] The preparation method of the antiseptic treatment solution in Step 2 is as follows:

[0058] S1. Weigh 6 parts by weight of basic copper carbonate, 6 parts by weight of basic zinc carbonate, 2 parts by weight of ammonium citrate, and 200 parts by weight of deionized water, mix them, heat to 25° C., adjust the pH to 8 with aqueous ammonia, and then pour them into a ball mill and grind them at a speed of 3500 r / min for 2 h. The resultant is recorded as a nano-modified component;

[0059] S2, weighing 40 parts by weight of deionized water, 2 parts by weight of dodecylphenol polyoxyethylene ether, 1 part by weight of sodium lauryl sulfate, 11 parts by weight of methyl methacrylate, 9 parts by weight of butyl acrylate and 8 parts by weight of isooctyl acrylate and mixing them at a mixing speed of 200 r / min for 8 min, then heating to 80° C. for pre-emulsification for 30 min, and then adding 3 parts by weight of potassium persulfate solution dropwise, the resultant is recorded as seed emulsion;

[0060] S3, adding 3 parts by weight of potassium persulfate solution, 8 parts by weight of methyl methacrylate, 6 parts by weight of butyl acrylate, 5 parts by weight of isooctyl acrylate and 8 parts by weight of silane coupling agent-570 to the seed emulsion and mixing them at a mixing speed of 200 r / min for 8 minutes, reacting at a temperature of 80° C. for 3 hours, and cooling to room temperature to obtain a silicon-containing acrylate emulsion;

[0061] S4. Mix the nano-modified component in S1 and the silicon-containing acrylate emulsion in S3 in a weight ratio of 2:1, stir at a stirring speed of 600 r / min for 8 minutes, and then subject to ultrasonic dispersion at a frequency of 26 kHz for 10 minutes to obtain an anti-corrosion treatment solution.

[0062] Step 3: Pour the white pigment and the color pigment into the homemade ink solvent respectively and mix them to prepare white ink and color ink. After mixing, spray them on the surface of the antiseptic cork by spray printing and dry them at a temperature of 40°C for 10 minutes.

[0063] The preparation method of the homemade ink solvent in Step 3 is as follows: propylene glycol methyl ether propionate and vinyl chloride vinyl acetate copolymer are mixed in a volume ratio of 3:1, and stirred at a stirring speed of 400 r / min for 15 minutes to obtain the homemade ink solvent;

[0064] The preparation method of white ink in Step 3 is as follows: 95 parts of homemade ink solvent, 6 parts of white pigment and 2 parts of dispersant are weighed by weight and poured into a ball mill for ball milling at a speed of 500 r / min for 24 hours. The obtained product is sieved through a 200-mesh sieve to obtain white ink; the white pigment is prepared by mixing talc and titanium dioxide powder in equal weight ratios and grinding them through a 200-mesh sieve; the dispersant model is DISPERBYK-116;

[0065] The preparation method of the colored ink in Step 3 is as follows: 95 parts of homemade ink solvent, 6 parts of color pigments and 2 parts of dispersant are weighed according to weight, poured into a ball mill for ball milling, the ball milling speed is 500 r / min, the ball milling time is 24 hours, and the obtained color ink is passed through a 200-mesh sieve; the color pigments are magenta pigment model MAGENTA5B-K, cyan pigment model BLUE4G-K, yellow pigment model YELLOW4G-K and black pigment model BLACKC-K, and the dispersant model is DISPERBYK-9076.

[0066] Step 4: Prepare a transparent protective solution using modified silica and water-based fluorocarbon emulsion resin as raw materials. Apply the transparent protective solution to the surface of the antiseptic cork that has been treated in Step 3 and spray-printed with pigment. Finally, cure it with UV light for 30 seconds to obtain a cork printed with white and color.

[0067] The method for preparing the transparent protective solution in Step 4 includes the following steps:

[0068] Step 1, adding 8 parts by weight of nano-silica to 50 parts by weight of toluene, ultrasonically dispersing at a frequency of 25 kHz for 1 minute, adding 5 parts by weight of a silane coupling agent, and ultrasonically dispersing at the original frequency for 30 minutes, filtering, and washing the precipitate with deionized water three times, drying at a temperature of 48° C. for 10 hours, and grinding through a 200-mesh sieve to obtain the modified silica;

[0069] Step 2: Disperse the modified silica in a water-based fluorocarbon emulsion resin at a weight ratio of 5%, stir at a stirring speed of 2300 r / min for 40 minutes, add xylene to adjust the viscosity to meet the standard of GB1723-79, and obtain a transparent protective solution.

[0070] Example 3

[0071] A process for printing white and color on cork in this embodiment includes the following steps:

[0072] Step 1. After the cork material is pre-treated and sanded to the required thickness using a sanding machine, it is cut into appropriate sizes. The resulting material is recorded as the cork substrate.

[0073] The specific method of pretreatment in Step 1 is as follows: after removing the black skin on the surface of the cork, place it in boiling water and steam it for 9 minutes to soften it. After softening, take it out, drain it, and dry it at a temperature of 58° C. for 18 hours.

[0074] Step 2: Soak the cork substrate in the antiseptic treatment solution for 3 hours, drain it, and then dry it at 57°C for 10 hours. The obtained product is recorded as antiseptic cork.

[0075] The preparation method of the antiseptic treatment solution in Step 2 is as follows:

[0076] S1. Weigh 6 parts by weight of basic copper carbonate, 5 parts by weight of basic zinc carbonate, 2 parts by weight of ammonium citrate, and 190 parts by weight of deionized water, mix them, heat to 25° C., adjust the pH to 8 with aqueous ammonia, and then pour them into a ball mill and grind them at a speed of 3500 r / min for 2 h. The resultant is recorded as a nano-modified component;

[0077] S2, weighing 35 parts by weight of deionized water, 2 parts by weight of dodecylphenol polyoxyethylene ether, 0.8 parts by weight of sodium lauryl sulfate, 10 parts by weight of methyl methacrylate, 8 parts by weight of butyl acrylate and 7 parts by weight of isooctyl acrylate and mixing them at a mixing speed of 150 r / min for 7 minutes, then heating to 80° C. for pre-emulsification for 30 minutes, and then adding 3 parts by weight of potassium persulfate solution dropwise, the resultant is recorded as seed emulsion;

[0078] S3, adding 2 parts by weight of potassium persulfate solution, 7 parts by weight of methyl methacrylate, 5 parts by weight of butyl acrylate, 5 parts by weight of isooctyl acrylate and 6 parts by weight of silane coupling agent-570 to the seed emulsion and mixing them at a mixing speed of 150 r / min for 7 minutes, reacting at a temperature of 80° C. for 3 hours, and cooling to room temperature to obtain a silicon-containing acrylate emulsion;

[0079] S4. Mix the nano-modified component in S1 and the silicon-containing acrylate emulsion in S3 in a weight ratio of 2:1, stir at a stirring speed of 500 r / min for 7 minutes, and then subject to ultrasonic dispersion at a frequency of 25 kHz for 9 minutes to obtain an anti-corrosion treatment solution.

[0080] Step 3: Pour the white pigment and the color pigment into the homemade ink solvent respectively and mix them to prepare white ink and color ink. After mixing, spray them on the surface of the antiseptic cork by spray printing and dry them at a temperature of 38°C for 8 minutes.

[0081] The preparation method of the homemade ink solvent in Step 3 is as follows: propylene glycol methyl ether propionate and vinyl chloride vinyl acetate copolymer are mixed in a volume ratio of 3:1, and stirred at a stirring speed of 400 r / min for 13 minutes to obtain the homemade ink solvent;

[0082] The preparation method of white ink in Step 3 is as follows: 93 parts of homemade ink solvent, 5 parts of white pigment and 2 parts of dispersant are weighed by weight and poured into a ball mill for ball milling at a speed of 400 r / min for 23 hours. The obtained product is sieved through a 200-mesh sieve to obtain white ink; the white pigment is prepared by mixing talc and titanium dioxide powder in equal weight ratios and grinding them through a 200-mesh sieve; the dispersant model is DISPERBYK-116;

[0083] The preparation method of the colored ink in Step 3 is as follows: 93 parts of homemade ink solvent, 6 parts of color pigments and 2 parts of dispersant are weighed in parts by weight and poured into a ball mill for ball milling. The ball milling speed is 500 r / min and the ball milling time is 23 hours. After ball milling, the obtained product is sieved through a 200-mesh sieve to obtain the colored ink; the color pigments are magenta pigment model MAGENTA5B-K, cyan pigment model BLUE4G-K, yellow pigment model YELLOW4G-K and black pigment model BLACKC-K, and the dispersant model is DISPERBYK-9076.

[0084] Step 4: Prepare a transparent protective solution using modified silica and water-based fluorocarbon emulsion resin as raw materials. Apply the transparent protective solution to the surface of the antiseptic cork that has been treated in Step 3 and spray-printed with pigment. Finally, cure it with UV light for 28 seconds to obtain a cork printed with white and color.

[0085] The method for preparing the transparent protective solution in Step 4 includes the following steps:

[0086] Step 1, adding 7 parts by weight of nano-silica to 50 parts by weight of toluene, ultrasonically dispersing at a frequency of 24 kHz for 1 minute, adding 4 parts by weight of a silane coupling agent, ultrasonically dispersing at the original frequency for 28 minutes, filtering, washing the precipitate three times with deionized water, drying at a temperature of 47° C. for 9 hours, and grinding through a 200-mesh sieve to obtain the modified silica;

[0087] Step 2: Disperse the modified silica in a water-based fluorocarbon emulsion resin at a weight ratio of 4%, stir at a stirring speed of 2200 r / min for 38 minutes, add xylene to adjust the viscosity to meet the standard of GB1723-79, and obtain a transparent protective solution.

[0088] Comparative Example 1

[0089] The process for printing white and color on cork provided in this comparative example is substantially the same as that in Example 1, with the main difference being that in this comparative example 1, the antiseptic treatment solution in Example 1 is replaced with a silicon-containing acrylate emulsion (the preparation method of the silicon-containing acrylate emulsion has been mentioned in Example 1 and will not be elaborated on here).

[0090] Comparative Example 2

[0091] The process for printing white and color on cork provided in this comparative example is roughly the same as that in Example 1, except that the modified silicon dioxide in Example 1 is replaced by unmodified nano-silicon dioxide.

[0092] Performance Testing

[0093] The properties of the antiseptic corks and the corks printed with white and color obtained by the process methods of Examples 1-3 and Comparative Examples 1-2 were tested. The specific testing methods and test items are as follows:

[0094] 1. The corrosion resistance of the antiseptic cork obtained by the process methods of Examples 1-3 and Comparative Examples 1-2 was tested with reference to the standard of "Wood Durability" (GB / T13942.1-2009). The lower the weight loss rate, the better the corrosion resistance.

[0095] 2. The pencil hardness of the white and colored printed cork surface coatings in Examples 1-3 and Comparative Examples 1-2 was tested in accordance with the standard GB / T 67391996 "Determination of Coating Hardness by Pencil Method";

[0096] 3. The corks printed with white and colored materials in accordance with Examples 1-3 and Comparative Examples 1-2 were fixed on a friction and wear tester, and the wear was measured at 150 and 300 revolutions.

[0097] The data obtained are recorded in the table below;

[0098]

[0099] The data in the table show that the corrosion resistance of the antiseptic cork prepared by the process methods in Examples 1-3 is significantly better than that of the antiseptic cork prepared by the process method in Comparative Example 1, indicating that the antiseptic performance of the cork substrate can be significantly improved after soaking the cork substrate in the antiseptic treatment solution; secondly, the pencil hardness and wear resistance of the surface coating of the cork printed with white and color prepared by the process methods in Examples 1-3 are significantly better than those of the cork printed with white and color prepared by the process method in Comparative Example 2, indicating that the transparent protective solution prepared in Examples 1-3 can significantly improve the wear resistance of the cork surface.

[0100] In summary, the process for printing white and colored images on cork in the present invention has excellent market promotion value.

[0101] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0102] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A process for printing white and color on cork, characterized in that: The process comprises the following steps: Step 1. After the cork material is pre-treated and sanded to the required thickness using a sanding machine, it is cut into appropriate sizes, and the resulting material is recorded as the cork substrate; Step 2, soaking the cork substrate in the antiseptic treatment solution for 2-3 hours, draining it, and then drying it at a temperature of 55-58°C for 8-12 hours. The obtained product is recorded as the antiseptic cork; Step 3: Pour the white pigment and the color pigment into the homemade ink solvent respectively to prepare white ink and color ink, spray them on the surface of the antiseptic cork by spray printing, and dry them at a temperature of 35-40°C for 5-10 minutes; Step 4: Prepare a transparent protective solution using modified silica and water-based fluorocarbon emulsion resin as raw materials. Apply the transparent protective solution to the surface of the antiseptic cork that has been treated in Step 3 and spray-printed with pigment. Finally, cure it with ultraviolet light to obtain a cork printed with white and color. The method for preparing the transparent protective solution in Step 4 comprises the following steps: Step 1, adding 5-8 parts by weight of nano-silica to 50 parts by weight of toluene, ultrasonically dispersing at a frequency of 23-25 ​​kHz for 1 minute, adding 3-5 parts by weight of a silane coupling agent, ultrasonically dispersing at the original frequency for 25-30 minutes, filtering, washing the precipitate three times with deionized water, drying at a temperature of 45-48° C. for 8-10 hours, and grinding through a 200-mesh sieve to obtain the modified silica; Step 2: Disperse the modified silica in an aqueous fluorocarbon emulsion resin at a weight ratio of 3-5%, stir at a stirring speed of 2200-2300 r / min for 35-40 minutes, and add xylene to adjust the viscosity to obtain a transparent protective solution; The UV curing time in Step 4 is 25-30 seconds; The preparation method of the antiseptic treatment solution in Step 2 is: S1. Weigh 5-6 parts by weight of basic copper carbonate, 5-6 parts by weight of basic zinc carbonate, 1-2 parts by weight of ammonium citrate, and 180-200 parts by weight of deionized water, mix them, heat to 25° C., adjust the pH to 7-8 with aqueous ammonia, and then grind them in a ball mill. The resultant mixture is recorded as a nano-modified component. S2, weighing 30-40 parts by weight of deionized water, 1-2 parts by weight of dodecylphenol polyoxyethylene ether, 0.5-1 parts by weight of sodium lauryl sulfate, 10-11 parts by weight of methyl methacrylate, 7-9 parts by weight of butyl acrylate and 7-8 parts by weight of isooctyl acrylate, mixing and stirring, then heating to 80° C. for pre-emulsification for 30 minutes, and then adding 2-3 parts by weight of potassium persulfate solution dropwise, the resultant is recorded as seed emulsion; S3, adding 2-3 parts by weight of potassium persulfate solution, 6-8 parts by weight of methyl methacrylate, 5-6 parts by weight of butyl acrylate, 4-5 parts by weight of isooctyl acrylate and 5-8 parts by weight of silane coupling agent-570 to the seed emulsion, mixing and stirring, reacting at a temperature of 80° C. for 2-3 hours, and cooling to room temperature to obtain a silicon-containing acrylate emulsion; S4. Mix the nano-modified component in S1 and the silicon-containing acrylate emulsion in S3 in a weight ratio of 2:1, stir at a stirring speed of 500-600 r / min for 5-8 minutes, and then subject to ultrasonic dispersion at a frequency of 25-26 kHz for 8-10 minutes to obtain an anti-corrosion treatment solution.

2. A process for printing white and color on cork according to claim 1, characterized in that: The specific method of the pre-treatment in Step 1 is: after removing the black skin on the surface of the cork, place it in boiling water and cook it for 8-10 minutes to soften it. After softening, take it out, drain it and dry it at a temperature of 55-60° C. for 12-24 hours.

3. The process for printing white and color on cork according to claim 1, characterized in that: The grinding speed in S1 is 3500 r / min, and the grinding time is 1-2 h.

4. A process for printing white and color on cork according to claim 1, characterized in that: The mixing and stirring in S2 and S3 is performed at a stirring speed of 100-200 r / min and for a stirring time of 5-8 min.

5. The process for printing white and color on cork according to claim 1, characterized in that: The method for preparing the homemade ink solvent in Step 3 is as follows: propylene glycol methyl ether propionate and vinyl chloride vinyl acetate copolymer are mixed in a volume ratio of 3:1, and stirred at a stirring speed of 300-400 r / min for 10-15 minutes to obtain the homemade ink solvent.

6. The process for printing white and color on cork according to claim 1, characterized in that: The preparation method of the white ink in Step 3 is as follows: 90-95 parts of a homemade ink solvent, 5-6 parts of a white pigment, and 1-2 parts of a dispersant are weighed in parts by weight and poured into a ball mill for ball milling at a ball milling speed of 400-500 r / min for 22-24 hours. After ball milling, the mixture is passed through a 200-mesh sieve to obtain the white ink.

7. The process for printing white and color on cork according to claim 1, characterized in that: The preparation method of the color ink in Step 3 is as follows: 90-95 parts of a homemade ink solvent, 5-6 parts of a color pigment, and 1-2 parts of a dispersant are weighed in parts by weight and poured into a ball mill for ball milling at a ball milling speed of 400-500 r / min for 22-24 hours. After ball milling, the obtained mixture is passed through a 200-mesh sieve to obtain the color ink.

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