Dyed security fiber and its preparation method and application

Abstract

The application discloses dyed anti-fake fiber and a preparation method and application thereof, and belongs to the papermaking technical field.The technical scheme is as follows: the preparation method of the dyed anti-fake fiber comprises pulping, screening of pulp, dyeing, washing and airing, and the pulping process comprises wood chip washing, pre-soaking, reaction bin, high-concentration grinding, medium-concentration bleaching, high-concentration bleaching, latent elimination, low-concentration grinding, pressure screen, multi-disc, vacuum pulp washing and pulp storage, and specifically comprises the following steps: 1) screening of pulp; 2) preparation of anti-fake dye solution; 3) dyeing; 4) washing; 5) airing, to obtain anti-fake fiber for papermaking; and application of the anti-fake fiber in original paper manufacturing.The wood pulp fiber is used to replace polyurethane high molecular material fiber, manufacturing and production costs are greatly reduced, the functional original paper with general anti-fake quality demand can be met, and the functional original paper with not very high anti-fake quality demand has high practical value.

Description

Technical Field

[0001] This invention belongs to the field of papermaking technology, specifically relating to a dyed anti-counterfeiting fiber, its preparation method, and its application. Background Technology

[0002] Paper is currently the material basis for printing various packaging materials. Some special papers manufactured using special processes have anti-counterfeiting features. One of the anti-counterfeiting technologies used in special papers is the addition of anti-counterfeiting fibers. Anti-counterfeiting fibers are a basic anti-counterfeiting material. There are three ways to use anti-counterfeiting fibers: first, by incorporating them into the pulp during the papermaking process; second, by sprinkling them on the paper surface before the paper is set or after applying glue; and third, by mixing the fibers with glue and then coating them onto the paper surface. The resulting anti-counterfeiting papers have different anti-counterfeiting effects. Currently, the anti-counterfeiting fibers available on the market are generally made of polyurethane, and their special manufacturing process makes them generally expensive, usually costing several hundred yuan per kilogram. This is a high production cost for paper that only requires general anti-counterfeiting functionality, resulting in significant cost waste and placing a heavy burden on downstream customers. Chinese invention patent CN106283754A discloses a method for preparing anti-counterfeiting fibers for papermaking, including the following steps: First, dispersing and diluting the pulp and then grading and sieving it to obtain fiber pulp; second, dyeing the fibers; third, washing the dyed fibers; and fourth, drying the fibers for later use. However, the dyeing process requires the addition of a fixing agent, the amount of which is roughly equivalent to the dye, increasing production costs. Furthermore, dyeing needs to be carried out in a water bath at 60-70℃, and the drying process also requires controlling the drying temperature at 40-50℃, which will also cause some inconvenience to production and increase costs. In addition, if the fixing agent contains formaldehyde, there is a problem of free formaldehyde pollution, which is prohibited in many products. Summary of the Invention

[0003] This invention provides a dyed anti-counterfeiting fiber, its preparation method, and its application. By replacing polyurethane polymer fiber with wood pulp fiber, the manufacturing and production costs are greatly reduced, and the functional base paper can meet the general anti-counterfeiting quality requirements. It has high practical value in the field of functional base paper where the anti-counterfeiting quality requirements are not particularly high.

[0004] The technical solution of this invention is as follows:

[0005] Firstly, a method for preparing dyed anti-counterfeiting fibers is disclosed, including pulping, pulp screening, dyeing, washing, and drying. The pulping process includes wood chip washing, pre-impregnation, hot alkali extraction in a reaction chamber, high-consistency refining, medium-consistency bleaching, high-consistency bleaching, fiber thermal dispersion in a de-emergence tank, low-consistency refining, pressure sieve screening of good pulp, multi-disc washing and concentration, vacuum washer washing, and pulp storage. Specifically, it includes the following steps:

[0006] 1) Screening of pulp: The pulp is graded and screened by passing it through three levels of 325 mesh, 200 mesh and 50 mesh sieves respectively. The resulting fiber pulp is then wrung dry for later use.

[0007] 2) Preparation of anti-counterfeiting dye solution: The anti-counterfeiting dye is a triarylmethane-based purple lake, which is diluted.

[0008] 3) Dyeing: Place the fiber slurry in anti-counterfeiting dye for dyeing. The dyeing time is 30 min to 24 h. The amount of anti-counterfeiting dye used is 2.5% to 10% of the dry fiber mass.

[0009] 4) Washing: Wash with 150-200 times the weight of the oven-dry fibers in water until the dyed fibers no longer fade, then filter out the water.

[0010] 5) Drying: Dry at room temperature to obtain anti-counterfeiting fibers for papermaking.

[0011] Preferably, the slurry is a long fiber mechanical slurry, which is a mechanical slurry obtained before the fiber thermal dispersion process in the de-emergence tank.

[0012] Preferably, the staining process is carried out at room temperature.

[0013] Preferably, the anti-counterfeiting dye used is Pergalite Vi M CN manufactured by Solis Chemicals Ltd.

[0014] Secondly, the method for preparing the dyed anti-counterfeiting fiber disclosed herein produces anti-counterfeiting fibers.

[0015] Thirdly, the application of the aforementioned anti-counterfeiting fiber is disclosed, as follows: bleached softwood sulfate pulp, bleached hardwood sulfate pulp, and mechanical pulp are mixed to form a pulp, and then dyed anti-counterfeiting fiber is added. The added anti-counterfeiting fiber is 1%-3% of the oven-dry pulp mass. The pulp is poured into a paper forming machine to form a paper, and then pressed and dried to obtain the base paper.

[0016] Preferably, the weight ratio of bleached softwood sulfate pulp, bleached hardwood sulfate pulp and mechanical pulp is (10-15%):(60-75%):(15-25%).

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This invention uses triarylmethane-based purple lake as an anti-counterfeiting dye to dye mechanical pulp. The resulting anti-counterfeiting dye has a good dyeing effect when applied to the manufacture of base paper. It can meet the general anti-counterfeiting quality requirements of functional base paper and has high practical value in the field of functional base paper where the anti-counterfeiting quality requirements are not particularly high. 2. Compared with the polyurethane-based polymer anti-counterfeiting fibers that can be purchased on the market, it greatly saves manufacturing and production costs. Attached Figure Description

[0019] Figure 1 This is an effect diagram of the anti-counterfeiting fiber dyeing in Embodiment 1 of the present invention.

[0020] Figure 2 This is an effect diagram of the anti-counterfeiting fiber dyeing in Comparative Example 1 of the present invention.

[0021] Figure 3 This is a diagram showing the effect of the base paper prepared in Example 4 of the present invention under natural light.

[0022] Figure 4 This is a diagram showing the effect of the base paper prepared in Example 5 of the present invention under natural light.

[0023] Figure 5 This is a diagram showing the effect of the base paper prepared in Example 6 of the present invention under natural light.

[0024] Figure 6 This is a diagram showing the effect of the base paper prepared in Comparative Example 3 of the present invention under natural light.

[0025] Figure 7 This is a diagram showing the effect of the base paper prepared in Comparative Example 4 of this invention under natural light. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0027] Example 1

[0028] The preparation method of the dyed anti-counterfeiting fiber includes pulping, pulp screening, dyeing, washing and drying. The pulping process includes wood chip washing, pre-impregnation, hot alkali extraction in a reaction chamber, high-consistency refining, medium-consistency bleaching, high-consistency bleaching, fiber thermal dispersion in a de-emergence tank, low-consistency refining, pressure sieve screening of good pulp, multi-disc washing and concentration, vacuum washing machine washing and pulp storage. Specifically, it includes the following steps:

[0029] 1) Screening of pulp: The pulp is long fiber mechanical pulp, which is the mechanical pulp obtained before the fiber thermal dispersion process in the submersion tank. The pulp is graded and screened by passing it through three levels of 325 mesh, 200 mesh and 50 mesh sieves to remove short fibers and retain long fibers. Then the obtained fiber pulp is wrung dry for later use.

[0030] 2) Preparation of anti-counterfeiting dye solution: The anti-counterfeiting dye is a triarylmethane purple lake, specifically Pergalite Vi M CN produced by Solis Chemical Co., Ltd. Take 0.4g of anti-counterfeiting dye, add 200g of water, and dilute the anti-counterfeiting dye to obtain the anti-counterfeiting dye solution.

[0031] 3) Dyeing: Take 3g of the dried fiber pulp prepared in step 1) and place it in 150g of the anti-counterfeiting dye solution diluted in step 2) and dye it at room temperature for 30 minutes. The amount of anti-counterfeiting dye used is 10% of the dry fiber mass.

[0032] 4) Washing: Wash with water equal to 200 times the weight of the oven-dry fibers until the dyed fibers no longer fade, then filter to remove the water.

[0033] 5) Drying: Dry at room temperature to obtain anti-counterfeiting fibers for papermaking. The effect of dyeing the anti-counterfeiting fibers is shown in the image below. Figure 1 As shown, Figure 1 The original image was a color print, with a uniform deep purple hue.

[0034] Comparative Example 1

[0035] Unlike Example 1, the mechanical pulp in step 1) was replaced with an equal mass of bleached softwood sulfate pulp, and the dyeing effect of the anti-counterfeiting fiber was as follows: Figure 2 As shown, Figure 2 The original image was a color image, but the coloring was light and uneven.

[0036] Comparative Example 2

[0037] Unlike Example 1, in step 2), the anti-counterfeiting dye used is an equal amount of Pergalite Vi BL AP produced by Solis Chemicals Ltd.

[0038] Example 2

[0039] The preparation method of the dyed anti-counterfeiting fiber includes pulping, pulp screening, dyeing, washing and drying. The pulping process includes wood chip washing, pre-impregnation, hot alkali extraction in a reaction chamber, high-consistency refining, medium-consistency bleaching, high-consistency bleaching, fiber thermal dispersion in a de-emergence tank, low-consistency refining, pressure sieve screening of good pulp, multi-disc washing and concentration, vacuum washing machine washing and pulp storage. Specifically, it includes the following steps:

[0040] 1) Screening of pulp: The pulp is long fiber mechanical pulp, which is the mechanical pulp obtained before the fiber thermal dispersion process in the anti-submersion tank. The pulp is graded and screened by passing it through three levels of 325 mesh, 200 mesh and 50 mesh sieves respectively. Then the obtained fiber pulp is wrung dry for later use.

[0041] 2) Preparation of anti-counterfeiting dye solution: The anti-counterfeiting dye is a triarylmethane purple lake, specifically Pergalite Vi M CN produced by Solis Chemical Co., Ltd. Take 0.4g of anti-counterfeiting dye, add 800g of water, and dilute the anti-counterfeiting dye to obtain the anti-counterfeiting dye solution.

[0042] 3) Dyeing: Take 3g of the dried fiber slurry prepared in step 1), place it in 150g of the diluted anti-counterfeiting dye solution in step 2), and dye it at room temperature for 24 hours. The amount of anti-counterfeiting dye used is 2.5% of the dry fiber mass.

[0043] 4) Washing: Wash with 150 times the weight of the dried fibers in water until the dyed fibers no longer fade, then filter out the water.

[0044] 5) Drying: Dry at room temperature to obtain anti-counterfeiting fibers for papermaking.

[0045] Example 3

[0046] The preparation method of the dyed anti-counterfeiting fiber includes pulping, pulp screening, dyeing, washing and drying. The pulping process includes wood chip washing, pre-impregnation, hot alkali extraction in a reaction chamber, high-consistency refining, medium-consistency bleaching, high-consistency bleaching, fiber thermal dispersion in a de-emergence tank, low-consistency refining, pressure sieve screening of good pulp, multi-disc washing and concentration, vacuum washing machine washing and pulp storage. Specifically, it includes the following steps:

[0047] 1) Screening of pulp: The pulp is long fiber mechanical pulp, which is the mechanical pulp obtained before the fiber thermal dispersion process in the anti-submersion tank. The pulp is graded and screened by passing it through three levels of 325 mesh, 200 mesh and 50 mesh sieves respectively. Then the obtained fiber pulp is wrung dry for later use.

[0048] 2) Preparation of anti-counterfeiting dye solution: The anti-counterfeiting dye is a triarylmethane purple lake, specifically Pergalite Vi M CN produced by Solis Chemical Co., Ltd. Take 0.4g of anti-counterfeiting dye, add 400g of water, and dilute the anti-counterfeiting dye to obtain the anti-counterfeiting dye solution.

[0049] 3) Dyeing: Take 3g of the dried fiber pulp prepared in step 1) and place it in 150g of the anti-counterfeiting dye solution diluted in step 2) and dye it at room temperature for 12 hours. The amount of anti-counterfeiting dye used is 5% of the dry fiber mass.

[0050] 4) Washing: Wash with 170 times the weight of the dried fibers in water until the dyed fibers no longer fade, then filter to remove the water.

[0051] 5) Drying: Dry at room temperature to obtain anti-counterfeiting fibers for papermaking.

[0052] Example 4

[0053] The application of the anti-counterfeiting fiber is as follows: 15 parts by weight of bleached softwood sulfate pulp, 60 parts by weight of bleached hardwood sulfate pulp, and 25 parts by weight of mechanical pulp are used to prepare a pulp. Then, 1 part of the dyed anti-counterfeiting fiber prepared in Example 1 is added. The added anti-counterfeiting fiber is 1% of the dry mixed pulp mass. The pulp is poured into a paper forming machine and then pressed and dried to obtain the base paper.

[0054] Example 5

[0055] The application of the anti-counterfeiting fiber is as follows: 10 parts by weight of bleached softwood sulfate pulp, 75 parts by weight of bleached hardwood sulfate pulp, and 15 parts by weight of mechanical pulp are used to prepare a pulp. Then, 3 parts of the dyed anti-counterfeiting fiber prepared in Example 1 are added. The added anti-counterfeiting fiber is 3% of the dry mixed pulp mass. The pulp is poured into a paper forming machine and then pressed and dried to obtain the base paper.

[0056] Example 6

[0057] The application of the anti-counterfeiting fiber is as follows: 12 parts by weight of bleached softwood sulfate pulp, 65 parts by weight of bleached hardwood sulfate pulp, and 23 parts by weight of mechanical pulp are used to prepare a pulp. Then, 3 parts of the dyed anti-counterfeiting fiber prepared in Example 1 are added. The added anti-counterfeiting fiber is 3% of the dry mixed pulp mass. The pulp is poured into a paper forming machine and then pressed and dried to obtain the base paper.

[0058] Comparative Example 3

[0059] Unlike Example 4, the dyed anti-counterfeiting fiber used was the dyed anti-counterfeiting fiber prepared in Comparative Example 1.

[0060] Comparative Example 4

[0061] Unlike Example 4, the dyed anti-counterfeiting fiber used was the dyed anti-counterfeiting fiber prepared in Comparative Example 2.

[0062] The effects of the base papers prepared in Examples 4-6 and Comparative Examples 3-4 under natural light irradiation are shown below. Figure 3-7 As shown, from Figure 3 and Figure 4 As can be seen from the examples 4-5 of the present invention, the anti-counterfeiting fibers can be clearly seen in the prepared base paper, while in comparative examples 3-4, the anti-counterfeiting effect is difficult to show after the base paper is manufactured because the anti-counterfeiting fibers are not obviously dyed.

[0063] The raw material costs of Example 1 of this application are shown in Table 1:

[0064] Table 1

[0065]

[0066]

[0067] As can be seen from Table 1, the anti-counterfeiting fiber prepared in this application significantly reduces production and manufacturing costs compared with commercially available polyurethane polymer fibers. It can meet the general anti-counterfeiting quality requirements for the production of functional base paper and has high practical value in the field of functional base paper where anti-counterfeiting quality requirements are not particularly high.

[0068] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. Use of dyed security fibers, characterized in that, Specific as follows: the bleached softwood kraft pulp, bleached hardwood kraft pulp, mechanical pulp are prepared into pulp, then the dyeing anti-fake fiber is added, the added mass of the dyeing anti-fake fiber is 1%-3% of the mass of the absolute dry pulp, poured into a paper sheet former to form, then after pressing and drying, the raw paper is obtained; the weight ratio of the bleached softwood kraft pulp, bleached hardwood kraft pulp and mechanical pulp is (10-15%):(60-75%):(15-25%); The preparation method of the dyeing anti-fake fiber comprises pulp preparation, pulp screening, dyeing, washing and air drying, the pulp preparation process comprises wood chip washing, pre-impregnation, reaction bin hot alkali extraction, high concentration grinding, medium concentration bleaching, high concentration bleaching, latent pool fiber heat dispersion, low concentration grinding, pressure screen fine pulp screening, multi-disc washing concentration, vacuum pulp washing machine washing and pulp storage, and specifically comprises the following steps: 1) Pulp screening: the pulp is long fiber mechanical pulp, the long fiber mechanical pulp is the mechanical pulp obtained before the latent pool fiber heat dispersion process, the pulp is classified and screened, respectively passing through three levels of 325 mesh, 200 mesh and 50 mesh screening, then the prepared fiber pulp is wrung dry for standby; 2) Preparation of anti-fake dye solution: the anti-fake dye is a triarylmethane purple lake, and the anti-fake dye is diluted; 3) Dyeing: the fiber pulp is dyed in the anti-fake dye, the dyeing time is 30 min-24 h, and the amount of the anti-fake dye is 2.5%-10% of the mass of the absolute dry fiber; 4) Washing: the absolute dry fiber is washed with 150-200 times of water, the dyed fiber is washed until it does not fade, and the clear water is filtered out; 5) Air drying: air drying at room temperature to obtain the anti-fake fiber for papermaking; The dyeing process is carried out at room temperature; The anti-fake dye is Pergalite Vi M CN.

Images