Fluorescent specialty paper based on fluorescent fabric and process for manufacturing the same

Abstract

The application belongs to the field of fluorescent paper, and particularly relates to a fluorescent special paper based on fluorescent fabric and a manufacturing process thereof. The manufacturing process comprises the following steps: S1: preparation of pulp: mechanically beating the fluorescent textile until the rags are completely defibered into fibrous pulp to obtain fluorescent pulp; S2: making fluorescent paper: mixing the fluorescent pulp with wood pulp to make and dry the fluorescent special paper. The application directly introduces the functional pulp containing fluorescent dyes into the paper sheet, realizes the resource utilization of the fluorescent dyed textile fibers, and reduces the pollution to the environment. The added fluorescent pulp enables the paper to have unique optical properties.

Description

Technical Field

[0001] This invention belongs to the field of fluorescent paper, specifically relating to a fluorescent specialty paper based on fluorescent fabric and its manufacturing process. Background Technology

[0002] With the continuous expansion of textile production and consumption, a large amount of waste textiles has been generated. Currently, the disposal of waste textiles still mainly relies on landfill or incineration. These methods not only waste fiber resources but also easily lead to dyes seeping into the soil and water or producing toxic gases, polluting the environment. In addition, strong acid and alkali treatments are also commonly used methods for decolorizing or hydrolyzing waste textiles, but their reaction conditions are violent and easily destroy the covalently bonded fluorescent dye structure in the fibers, causing the fluorescent components to dissolve and be lost, thus causing the recycled materials to lose their original fluorescent function.

[0003] Neither landfilling, incineration, nor chemical treatment can achieve efficient recycling of waste textiles, leading to a serious waste of fiber resources. In recent years, some progress has been made in the recycling of cellulose and regenerated cellulose textiles (such as waste cotton and denim). However, research on the resource recovery of fluorescently dyed textiles containing persistent organic fluorescent dyes remains limited due to the high stability and difficulty in processing these dyes, resulting in relatively few published studies. How to achieve efficient recycling and high-value utilization of waste fluorescent textile fibers has become a key challenge restricting research in fluorescent textiles. Summary of the Invention

[0004] The purpose of this invention is to overcome the deficiencies in the prior art and provide a fluorescent special paper for fluorescent fabrics and its manufacturing process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A manufacturing process for fluorescent specialty paper based on fluorescent fabric includes the following steps: S1: Pulp preparation: Mechanically pulping the fluorescent textile until the fabric scraps are completely broken down into fibrous pulp to obtain fluorescent pulp; S2: Papermaking of fluorescent paper: Mixing the fluorescent pulp with wood pulp, papermaking and drying to obtain fluorescent specialty paper.

[0006] In step S1, the pulping time is 0.5 to 4 hours, and the pulping method is one or any combination of Wali pulping, PFI pulping, medium consistency mill, and high consistency mill. The resulting fluorescent pulp is sealed and stored at 4°C for later use.

[0007] In step S1, the fluorescent textile material is one or any combination of regenerated cellulose textile or pure cotton textile; the fluorescent textile material contains fluorescent color; the fluorescent color includes one or any combination of fluorescent yellow, fluorescent green, or fluorescent orange.

[0008] The specific steps of step S2 are as follows: the fluorescent paste and wood pulp are mixed in different proportions and the mixture is made uniform by using a disintegration mechanism; wet strength agent and sizing agent are added, and after being thoroughly stirred and mixed, wet paper sheets are made by wet forming process, and after being dried at a certain temperature, a certain amount of fluorescent paper is obtained.

[0009] The oven-dry mass ratio of fluorescent paste to wood pulp is (1~6):(4~9); the concentration of the fluorescent paste is 5-15%; preferably 10%.

[0010] The wood pulp is softwood pulp; preferably bleached sulfate softwood pulp; the pulp beatness is 25~65°SR; preferably 25~50°SR, more preferably 40°SR.

[0011] The wet strength agent is one or a combination of several of polyamide epichlorohydrin resin, urea-formaldehyde resin, and glyoxal-modified polyacrylamide resin; the amount of wet strength agent added is 0.1% to 2.0% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent paste.

[0012] The sizing agent is one or more of alkyl ketene dimers, rosin-based sizing agents, styrene-acrylic emulsions, and alkenyl succinic anhydride; the amount of the sizing agent added is 0.05% to 1.0% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent pulp.

[0013] The present invention also includes a fluorescent specialty paper based on fluorescent fabric obtained by the manufacturing process of the fluorescent specialty paper based on fluorescent fabric, wherein the basis weight of the fluorescent specialty paper is 40 g. m -2 ~150 g m -2 Preferred weight: 60 g m -2 .

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By directly introducing functional pulp containing fluorescent dyes into paper sheets, not only is the resource utilization of fluorescent dyed textile fibers realized, but environmental pollution is also reduced.

[0015] 2. The added fluorescent paste gives the paper unique optical properties. Fluorescent paper, made by mixing fluorescent paste with softwood pulp, has both good mechanical strength and fluorescent effect, thus providing a practical new way for the high-value-added resource utilization of waste fluorescent textiles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the preparation process of the fluorescent paper of the present invention; Figure 2The diagram shows the tensile strength, bursting strength, tear strength of Example 1 and Comparative Example 1, as well as the fluorescence intensity comparison between Example 1 and Comparative Example 2. Figure 3 The tensile strength, bursting strength, tear strength of Example 2 and Comparative Example 1, and the fluorescence intensity comparison diagram of Example 2 and Comparative Example 2 are shown. Figure 4 The diagram shows the tensile strength, bursting strength, tear strength of Example 3 and Comparative Example 1, as well as the fluorescence intensity comparison between Example 3 and Comparative Example 2. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0018] Unless otherwise specified in this application, all percentages are mass percentages and all masses are absolute dry masses.

[0019] Example 1: Take 360 ​​g of fluorescent fabric for garment making, cut it into small pieces, disperse it to a concentration of 1.57%, and then process it using a Wali pulping machine for 1 hour until the fabric pieces are completely dispersed into fibrous pulp. Take 30 g of oven-dry pulp and prepare it to a concentration of 10%. Then, use a PFI pulping machine to pulp the pulp, preferably using a PFI pulping machine at 50,000 r for subsequent experiments.

[0020] A mixed pulp was prepared by mixing 1.25 g of fluorescent pulp and 11.25 g of softwood pulp with a freeness of 40 °SR in an oven-dry state at a ratio of 1:9. The pulp was thoroughly dissolved using a standard desolventizer, followed by the addition of 2% PAE and 1% rosin gum, and mixed thoroughly. A paper sheet with a basis weight of 60 g was then produced using a standard sheet forming machine. m -2 The fluorescent paper sheets, after drying, yield Example 1.

[0021] Comparative Example 1: 11.3 g of bleached coniferous sulfate pulp with a freeness of 40 °SR in its oven-dry state was thoroughly dissolved using a standard defrosting machine. Then, 2% (2% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent pulp) of PAE and 1% (1% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent pulp) of rosin were added and mixed thoroughly. A standard sheet forming machine was used to produce a sheet with a basis weight of 60 g. m -2 The paper sheets, after drying, yield Comparative Example 1.

[0022] Comparative Example 2: Untreated fluorescent garment scraps.

[0023] Figure 1(Left) is a comparison chart of tensile strength, bursting strength, and tear strength between Example 1 and Comparative Example 1 of the present invention. The tensile index of Example 1 is 60.2 N. mg -1 The bursting strength index is 4.46 kPa. m g -1 The tear index is 2.38 m. Nm 2 g -1 The tensile index of Comparative Example 1 is 65.99 N. m g -1 The bursting strength index is 4.98 kPa. m 2 g -1 The tear index is 2.71m. Nm 2 g -1 Compared to Comparative Example 1, Example 1 exhibits excellent mechanical properties with a tensile strength retention rate of 91.2%, a burst strength retention rate of 89.6%, and a tear strength retention rate of 87.8%.

[0024] Figure 1 (Right) This is a comparison of the fluorescence intensity of Example 1 and Comparative Example 2 of the present invention. Under the condition of emission voltage of 300 V, the fluorescent paper has a strong fluorescence emission peak in the range of 490–506 nm. The fluorescence intensity of Example 1 is 2040, and the fluorescence intensity of the comparative example is 7089, with a fluorescence retention rate of 28.8%. Example 1 has certain fluorescence properties.

[0025] Example 2: Take 360 ​​g of fluorescent fabric for garment making, cut it into small pieces, disperse it to a concentration of 1.57%, and then process it using a Wali pulping machine for 1 hour until the fabric scraps are completely dispersed into fibrous pulp. Take 30 g of oven-dry pulp and prepare it to a concentration of 10%. Then, use a PFI pulping machine to process the pulp, preferably a pulp with a PFI milling speed of 50,000 r for subsequent experiments.

[0026] A mixed pulp was prepared by mixing 5 g of fluorescent yellow pulp (at room dry condition) and 7.5 g of softwood pulp with a freeness of 40 °SR in a 4:6 ratio. The pulp was thoroughly loosened using a standard delamination machine. Then, 2% PAE and 1% rosin were added and mixed thoroughly. A paper sheet with a basis weight of 60 g was produced using a standard sheet forming machine. m -2 The fluorescent paper sheets, after drying, yield Example 2.

[0027] Figure 2 (Left) is a comparison chart of tensile strength, bursting strength, and tear strength between Example 2 and Comparative Example 1 of the present invention. The tensile index of Example 2 is 38.09 N. m g -1 The bursting strength index is 3.1 kPa. m 2 g -1 The tear index is 1.87 m. Nm 2 g -1 The tensile index of Comparative Example 1 is 65.99 N. m g -1 The bursting strength index is 4.98 kPa. m 2 g -1 The tear index is 2.71 m. Nm 2 g -1 Compared to Comparative Example 1, Example 2 exhibits a higher retention rate of mechanical properties (57.7% for tensile strength, 62.2% for bursting strength, and 69.0% for tear strength) and better mechanical properties.

[0028] Figure 2 (Right) This is a comparison of the fluorescence intensity of Example 2 and Comparative Example 2 of the present invention. Under an emission voltage of 300 V, the fluorescent paper exhibits a strong fluorescence emission peak in the range of 490–506 nm. The fluorescence intensity of Example 2 is 4409, while that of Comparative Example 2 is 7089, with a fluorescence retention rate of 62.2%. Example 2 shows a higher fluorescence intensity retention rate than Example 1, indicating better fluorescence performance.

[0029] Example 3: Take 360 ​​g of fluorescent fabric for garment making, cut it into small pieces, disperse it to a concentration of 1.57%, and then process it using a Wali pulping machine for 1 hour until the fabric scraps are completely dispersed into fibrous pulp. Take 30 g of oven-dry pulp and prepare it to a concentration of 10%. Then, use a PFI pulping machine to process the pulp, preferably a pulp with a PFI milling speed of 50,000 r for subsequent experiments.

[0030] Mix 7.5 g of fluorescent yellow pulp (octane dry) and 5 g of softwood pulp (40 °SR) at a ratio of 6:4 to prepare a mixed pulp. Thoroughly decompose the pulp using a standard decomposer. Then add 2% PAE wet strength agent and 1% styrene-acrylic sizing agent (liquid additives relative to oven-dry fibers) and mix thoroughly. Use a standard sheet forming machine to produce a 60 g basis weight sheet. m -2 The fluorescent paper sheets, after drying, yield Example 3.

[0031] Figure 3 (Left) Comparison chart of tensile strength, bursting strength, and tear strength between Example 3 and Comparative Example 1. The tensile index of Example 3 is 28.35 N. m g -1 The bursting strength index is 1.76 kPa. m 2 g -1 The tear index is 1.62m. Nm 2 g -1 The tensile index of the comparative example is 65.99 N. m g -1 The bursting strength index is 4.98 kPa. m 2 g -1 The tear index is 2.71m. Nm 2 g -1 Compared to Comparative Example 1, Example 3 retained 43.0% of the tensile strength, 35.3% of the bursting strength, and 59.8% of the tear index, and still possessed the basic mechanical properties.

[0032] Figure 3 (Right) This is a comparison of the fluorescence intensity of Example 3 and Comparative Example 2. Under an emission voltage of 300 V, the fluorescent paper exhibits a strong fluorescence emission peak in the range of 490–506 nm. The fluorescence intensity of Example 3 is 6224, while that of Comparative Example 2 is 7089, with a fluorescence retention rate of 87.8%. Example 3 demonstrates a high fluorescence retention rate and excellent fluorescence performance.

[0033] In summary, by directly introducing functional pulp containing fluorescent dyes into paper sheets, not only is the resource utilization of fluorescent dyed textile fibers realized, but environmental pollution is also reduced.

[0034] 2. The added fluorescent paste gives the paper unique optical properties. Fluorescent paper, made by mixing fluorescent paste with softwood pulp, has both good mechanical strength and fluorescent effect, thus providing a practical new way for the high-value-added resource utilization of waste fluorescent textiles.

[0035] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A manufacturing process for fluorescent specialty paper based on fluorescent fabric, characterized in that, The process includes the following steps: S1: Preparation of pulp: Mechanically pulping the fluorescent textile until the fabric scraps are completely broken down into fibrous pulp to obtain fluorescent pulp; S2: Making fluorescent paper: Mixing the fluorescent pulp with wood pulp, making paper, and drying to obtain fluorescent specialty paper.

2. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 1, characterized in that, In step S1, the fluorescent textile material is one or any combination of regenerated cellulose textile or pure cotton textile; the fluorescent textile material contains fluorescent color; the fluorescent color includes one or any combination of fluorescent yellow, fluorescent green, or fluorescent orange.

3. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 1, characterized in that, In step S1, the pulping time is 0.5 to 4 hours, and the pulping method is one or any combination of Wali pulping, PFI pulping, medium consistency mill, and high consistency mill. The resulting fluorescent pulp is sealed and stored at 4°C for later use.

4. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 1, characterized in that, The specific steps of step S2 are as follows: the fluorescent pulp and wood pulp are mixed and uniformly mixed using a disintegration mechanism; wet strength agent and sizing agent are added, and after thorough mixing, wet paper sheets are formed using a wet forming process, and after drying at a certain temperature, a certain amount of fluorescent paper is obtained.

5. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 3, characterized in that, The oven-dry mass ratio of fluorescent paste to wood pulp is (1~6):(4~9); the concentration of the fluorescent paste is 5-15%; preferably 10%.

6. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 3, characterized in that, The wood pulp is softwood pulp; preferably bleached sulfate softwood pulp; the pulp beatness is 25~65 °SR; preferably 25~50 °SR, more preferably 40 °SR.

7. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 3, characterized in that, The wet strength agent is one or a combination of several of polyamide epichlorohydrin resin, urea-formaldehyde resin, and glyoxal-modified polyacrylamide resin; the amount of wet strength agent added is 0.1% to 2.0% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent paste.

8. The manufacturing process of fluorescent specialty paper based on fluorescent fabric according to claim 3, characterized in that, The sizing agent is one or more of alkyl ketene dimers, rosin-based sizing agents, styrene-acrylic emulsions, and alkenyl succinic anhydride; the amount of the sizing agent added is 0.05% to 1.0% of the mixed mass of oven-dry wood pulp and oven-dry fluorescent pulp.

9. A fluorescent specialty paper based on fluorescent fabric obtained by the manufacturing process of fluorescent specialty paper based on fluorescent fabric according to any one of claims 1-7, characterized in that, The basis weight of the fluorescent specialty paper is 40 g. m -2 ~150 g m -2 Preferred weight: 60 g m -2 .

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