A paper sheet yarn and a process for making the same

Abstract

The application relates to the paper sheet yarn field, in particular to a paper sheet yarn and a preparation process thereof. The paper sheet yarn comprises a yarn body, the yarn body is formed by modifying and plying paper sheet yarns, the modified paper yarn is formed by modifying and twisting paper sheets, the modified and paper sheets are formed by cutting modified and paper, the modified and paper is prepared by sizing and paper through modified pulp, the modified pulp is prepared from the following raw materials: modified starch, polyvinyl alcohol fiber, polyamide epichlorohydrin, amphoteric polyacrylamide, alkyl alkene ketone dimer, 90-100 parts of deionized water; the preparation process comprises the following steps: taking and paper, preparing modified and paper after sizing and paper, then cutting the modified and paper to prepare modified and paper sheets, the width of the modified and paper sheets is 1-2 mm; twisting the modified and paper sheets to prepare modified paper sheet yarns, the twist direction is Z twist; plying two modified paper sheet yarns to prepare the yarn body, the twist direction is S twist.

Description

Technical Field

[0001] This application relates to the field of paper yarn, and in particular to a paper yarn and its preparation process. Background Technology

[0002] We live in an era of green environmental protection, and China places great emphasis on the development of renewable and circular industries, especially in the manufacturing sector. The textile industry is a crucial sector within this, with clothing today made from a variety of materials such as polyester, nylon, and acrylic. Different materials offer different characteristics, allowing consumers to choose materials according to their needs.

[0003] Paper yarn is a new type of yarn made primarily of natural cellulose. It is produced by cutting paper into thin strips 1-6mm wide and then twisting or combining it with other yarns. Paper yarn boasts several advantages, including high quality, low shrinkage, low pilling, and excellent moisture absorption and breathability. Fabrics made from it have a linen-like feel, effectively wicking away moisture and reducing odors. Furthermore, paper yarn is marketed as natural, environmentally friendly, and biodegradable, giving it a unique appeal. However, because it is made from twisted paper strips of natural cellulose, paper yarn has relatively low tensile strength, making fabrics made from it more susceptible to damage. Summary of the Invention

[0004] To improve the breaking strength of paper yarn, this application provides a paper yarn and its preparation process.

[0005] In the first aspect, this application provides a paper yarn, which adopts the following technical solution:

[0006] A type of paper yarn includes a yarn body, the yarn body being formed by plying modified paper yarn, the modified paper yarn being formed by twisting modified paper and paper, the modified paper and paper being formed by cutting modified paper and paper, the modified paper and paper being obtained by sizing paper with a modified sizing agent, the modified sizing agent being prepared from the following raw materials in parts by weight: 4-8 parts of modified starch, 2-6 parts of polyvinyl alcohol fiber, 1-3 parts of polyamide epichlorohydrin, 0.25-0.75 parts of amphoteric polyacrylamide, 0.1-0.3 parts of alkyl ketene dimer, and 90-100 parts of deionized water.

[0007] By adopting the above technical solutions, the addition of polyvinyl alcohol (PVA) fibers can increase the bonding strength between washi paper fibers, thereby improving the overall breaking strength of washi paper. Furthermore, PVA fibers are softer than washi paper fibers, and their addition can also improve the softness of washi paper. Since washi paper fibers, PVA fibers, and modified starch are all negatively charged, the slurry system is also negatively charged. However, the addition of polyamide epichlorohydrin, which carries a positive charge, can bring the potential of the slurry system closer to 0, making the slurry system positively charged. Moreover, polyamide epichlorohydrin readily undergoes a self-crosslinking reaction, forming a water-resistant covalent crosslinking network, which to some extent restricts fiber swelling and increases the tensile strength and wet tensile strength of washi paper. Amphoteric polyacrylamide itself carries a cationic charge, which can form ionic bonds with anions on the fibers, and the amide groups form hydrogen bonds with the hydroxyl groups of the fibers, thereby improving the strength of washi paper. Alkyl ketene dimers themselves contain long-chain aliphatic hydrocarbon functional groups and are hydrophobic. After addition, the hydrophobic groups are oriented outwards, thereby improving the wet tensile strength of washi paper.

[0008] Preferably, the modified starch is prepared from the following raw materials in parts by weight: 15-17 parts pea starch, 4-7 parts sodium hydroxide, and 5.5-8.5 parts chloroacetic acid.

[0009] By adopting the above technical solutions, sodium hydroxide can improve the gelatinization degree and dissolution rate of pea starch, thereby increasing reaction efficiency; chloroacetic acid can react with pea starch, replacing the hydroxyl groups on the pea starch with carboxymethyl groups to generate carboxymethyl starch. Carboxymethyl starch is anionic starch, characterized by good fluidity, easy solubility in water, low gelatinization temperature, and stable chemical properties. It also has good adhesion to fibers. Carboxymethyl fibers penetrate and cover washi paper, which can increase the cohesion between fibers on the washi paper, improve tensile strength and abrasion resistance, and also improve the connection strength between polyvinyl alcohol fibers and washi paper fibers.

[0010] Preferably, the mass ratio of pea starch to chloroacetic acid is 16.2:5.7-8.5, and the degree of substitution of the pea starch is 0.2-0.3.

[0011] By adopting the above technical solution, different mass ratios of pea starch and chloroacetic acid have different effects on the viscosity and thermal stability of modified starch, and also have different effects on the tensile strength of modified starch and paper. The more carboxymethyl groups introduced, the higher the solubility of modified starch, the easier it is to swell, the easier it is for molecular chains to entangle, and the higher the structural strength formed, thus the better the effect on improving the tensile strength of modified starch and paper. However, when too many carboxymethyl groups are introduced, the substitution is too large, the solubility of modified starch is too high, which will affect the effect on improving the tensile strength of modified starch and paper. Therefore, this application proposes an optimal mass ratio of pea starch and chloroacetic acid to achieve higher tensile strength of modified starch and paper.

[0012] Preferably, the mass ratio of sodium hydroxide to chloroacetic acid is 18-22:23.6.

[0013] By adopting the above technical solution, different mass ratios of sodium hydroxide and chloroacetic acid will have different effects on the reaction efficiency of chloroacetic acid and pea starch. Increasing the amount of sodium hydroxide can improve the reaction efficiency and increase the substitution rate of hydroxyl groups. However, excessive sodium hydroxide will lead to side reactions, which will reduce the reaction efficiency and affect the degree of substitution, thus affecting the modification effect of modified starch on washi paper. Therefore, this application proposes an optimal mass ratio of sodium hydroxide and chloroacetic acid to make the modification effect of modified starch on washi paper better.

[0014] Preferably, the method for preparing the modified starch includes the following steps: dispersing pea starch with accurate measurement evenly, then adding sodium hydroxide with accurate measurement, stirring evenly, reacting at 25-35℃ for 25-35 min, then adding chloroacetic acid with accurate measurement, stirring evenly, and heating to 55-65℃ for 5-7 h, then rinsing with anhydrous ethanol, and finally drying at 90-100℃ for 4-6 h to obtain the modified starch.

[0015] By adopting the above technical solution, peas are first alkalized with sodium hydroxide to expose the molecular chains of pea starch, and then etherification is carried out with chloroacetic acid to generate carboxymethyl starch. The reaction time and temperature of the etherification reaction will affect the efficiency of the reaction.

[0016] Preferably, the mass ratio of the modified starch, polyvinyl alcohol fiber, and polyamide epichlorohydrin is 4-8:4:1-3.

[0017] By employing the above technical solutions, the effects on the tensile strength of washi paper vary depending on the mass ratio of modified starch, polyvinyl alcohol fiber, and polyamide epichlorohydrin. Increasing the amount of polyvinyl alcohol fiber can improve the bonding strength between washi paper fibers, making the bonding strength between the fibers greater than the strength of the washi paper fibers themselves. However, when excessive polyvinyl alcohol fiber is added, the difference between the bonding strength between the washi paper fibers and the strength of the washi paper fibers themselves becomes too large, which can cause the washi paper fibers to break directly, resulting in a decrease in tensile strength. Increasing the amount of polyamide epichlorohydrin can form a self-crosslinking network, improving the tensile strength of washi paper. However, when too much polyamide epichlorohydrin is added, the bonding strength formed by the self-crosslinking of polyamide epichlorohydrin is greater than the bonding strength between polyamide epichlorohydrin and the fibers, which can easily lead to a decrease in the tensile strength of washi paper.

[0018] Preferably, the modified paper is prepared by the following steps:

[0019] Step 1: Mix and stir the accurately measured modified starch, polyvinyl alcohol fiber and deionized water, heat to 90-100℃, and then keep the temperature constant for 1-1.5h. Then add accurately measured polyamide epichlorohydrin, amphoteric polyacrylamide and alkyl ketene dimer, keep the temperature constant and stir continuously for 5-10min to obtain the modified slurry.

[0020] Step 2: Maintain the temperature of the modified slurry at 90-100℃, sizing the paper, and then equilibrate it for 24-36 hours in a constant temperature and humidity environment of 18-22℃ and 60-70% to obtain the modified paper.

[0021] By adopting the above technical solution, washi paper is processed by applying modified pulp, which allows the modified pulp to penetrate the washi paper, thereby modifying the paper and improving its performance. Before pulping, the modified pulp is heated to completely dissolve all components and make the pulping more uniform. After pulping, the mixture is balanced to ensure complete penetration of the modified pulp, resulting in better modification and paper quality.

[0022] Secondly, this application provides a process for preparing paper yarn, which adopts the following technical solution:

[0023] A process for preparing paper-like yarn includes the following steps:

[0024] Step 1: Take washi paper, and after the washi paper is sized, it is made into modified washi paper. Then the modified washi paper is cut into modified washi paper pieces with a width of 1-2mm.

[0025] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn. The number of twisted ends is 100-200, the twist is 700-900 twists / m, and the twist direction is Z twist.

[0026] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900-1200 twists / m and an S-twist direction.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. Because this application incorporates polyvinyl alcohol fiber, carboxymethyl starch and polyamide epichlorohydrin, the polyvinyl alcohol fiber can increase the bonding strength between washi paper fibers, thereby improving the overall breaking strength of the washi paper. The carboxymethyl starch has good adhesion to the fibers, can penetrate and cover the washi paper, can increase the cohesion between the fibers on the washi paper, improve tensile strength and abrasion resistance, and can also improve the connection strength between the polyvinyl alcohol fiber and the washi paper fiber. Detailed Implementation

[0029] Preparation Example

[0030] Preparation Example 1

[0031] The preparation method of modified starch includes the following steps: 1.62 kg of pea starch is added to a stirrer and dispersed evenly, then 0.57 kg of sodium hydroxide is added, and the mixture is stirred at 300 r / min for 3 min. After stirring evenly, the mixture is reacted at 30℃ for 30 min, then 0.75 kg of chloroacetic acid is added, and the mixture is stirred at 300 r / min for 5 min. After stirring evenly, the mixture is heated to 60℃ and reacted for 6 h. Then, the mixture is washed with anhydrous ethanol, and finally dried at 100℃ for 5 h to obtain modified starch with a degree of substitution of 0.2.

[0032] Preparation Example 2

[0033] The difference between Preparation Example 2 and Preparation Example 1 is as follows: 1.62 kg of pea starch was added to a stirrer and dispersed evenly. Then, 0.85 kg of sodium hydroxide was added and stirred at 300 r / min for 3 min. After stirring evenly, the mixture was reacted at 30°C for 30 min. Then, 1.11 kg of chloroacetic acid was added and stirred at 300 r / min for 5 min. After stirring evenly, the mixture was heated to 60°C and reacted for 6 h. Then, the mixture was washed with anhydrous ethanol and finally dried at 100°C for 5 h to obtain modified starch with a degree of substitution of 0.3.

[0034] Preparation Example 3

[0035] The difference between Preparation Example 3 and Preparation Example 1 is as follows: 1.62 kg of pea starch was added to a stirrer and dispersed evenly. Then, 0.71 kg of sodium hydroxide was added and stirred at 300 r / min for 3 min. After stirring evenly, the mixture was reacted at 30°C for 30 min. Then, 0.93 kg of chloroacetic acid was added and stirred at 300 r / min for 5 min. After stirring evenly, the mixture was heated to 60°C and reacted for 6 h. Then, the mixture was washed with anhydrous ethanol and finally dried at 100°C for 5 h to obtain modified starch with a degree of substitution of 0.25.

[0036] Preparation Example 4

[0037] The difference between Preparation Example 4 and Preparation Example 1 is as follows: 1.62 kg of pea starch was added to a stirrer and dispersed evenly. Then, 0.71 kg of sodium hydroxide was added and stirred at 300 r / min for 3 min. After stirring evenly, the mixture was reacted at 30 °C for 30 min. Then, 0.76 kg of chloroacetic acid was added and stirred at 300 r / min for 5 min. After stirring evenly, the mixture was heated to 60 °C and reacted for 6 h. Then, the mixture was washed with anhydrous ethanol and finally dried at 100 °C for 5 h to obtain modified starch with a degree of substitution of 0.25.

[0038] Preparation Example 5

[0039] The difference between Preparation Example 5 and Preparation Example 1 is as follows: 1.62 kg of pea starch was added to a stirrer and dispersed evenly. Then, 0.71 kg of sodium hydroxide was added and stirred at 300 r / min for 3 min. After stirring evenly, the mixture was reacted at 30°C for 30 min. Then, 0.84 kg of chloroacetic acid was added and stirred at 300 r / min for 5 min. After stirring evenly, the mixture was heated to 60°C and reacted for 6 h. Then, the mixture was washed with anhydrous ethanol and finally dried at 100°C for 5 h to obtain modified starch with a degree of substitution of 0.25.

[0040] Preparation Example 6

[0041] Modified paper is prepared by the following steps:

[0042] Step 1: Add 0.4 kg of the modified starch from Preparation Example 1, 0.4 kg of polyvinyl alcohol fiber and 9.03 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0043] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0044] Preparation Example 7

[0045] The difference between Preparation Example 7 and Preparation Example 6 is as follows:

[0046] Step 1: Add 0.4 kg of the modified starch from Preparation Example 2, 0.4 kg of polyvinyl alcohol fiber and 9.03 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0047] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0048] Preparation Example 8

[0049] The difference between Preparation Example 8 and Preparation Example 6 is as follows:

[0050] Step 1: Add 0.4 kg of the modified starch from Preparation Example 3, 0.4 kg of polyvinyl alcohol fiber and 9.03 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0051] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0052] Preparation Example 9

[0053] The difference between Preparation Example 9 and Preparation Example 6 is as follows:

[0054] Step 1: Add 0.4 kg of the modified starch from Preparation Example 4, 0.4 kg of polyvinyl alcohol fiber and 9.03 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0055] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0056] Preparation Example 10

[0057] The difference between Preparation Example 10 and Preparation Example 6 is as follows:

[0058] Step 1: Add 0.4 kg of the modified starch from Preparation Example 5, 0.4 kg of polyvinyl alcohol fiber and 9.03 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0059] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0060] Preparation Example 11

[0061] The difference between Preparation Example 11 and Preparation Example 6 is as follows:

[0062] Step 1: Add 0.8 kg of the modified starch from Preparation Example 5, 0.4 kg of polyvinyl alcohol fiber and 8.63 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0063] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0064] Preparation Example 12

[0065] The difference between Preparation Example 12 and Preparation Example 6 is as follows:

[0066] Step 1: Add 0.6 kg of the modified starch from Preparation Example 5, 0.4 kg of polyvinyl alcohol fiber and 8.83 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90 °C and keep at a constant temperature for 1 h. Next, add 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0067] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0068] Preparation Example 13

[0069] The difference between Preparation Example 13 and Preparation Example 6 is as follows:

[0070] Step 1: Add 0.6 kg of the modified starch from Preparation Example 5, 0.4 kg of polyvinyl alcohol fiber and 8.63 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90 °C and keep at a constant temperature for 1 h. Next, add 0.3 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0071] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0072] Preparation Example 14

[0073] The difference between Preparation Example 14 and Preparation Example 6 is as follows:

[0074] Step 1: Add 0.6 kg of the modified starch from Preparation Example 5, 0.4 kg of polyvinyl alcohol fiber and 8.73 kg of deionized water to a stirrer and mix at 300 r / min for 10 min. Then heat to 90°C and keep at a constant temperature for 1 h. Next, add 0.2 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer, keep at a constant temperature and continue stirring for 10 min to obtain the modified slurry.

[0075] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0076] Preparation Example 15

[0077] The difference between Preparation Example 15 and Preparation Example 6 is as follows: Step 1: 0.4 kg of the modified starch from Preparation Example 1 and 9.43 kg of deionized water are added to a stirrer and mixed at 300 r / min for 10 min. Then the mixture is heated to 90°C and kept at a constant temperature for 1 h. Next, 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer are added. The mixture is kept at a constant temperature and stirred continuously for 10 min to obtain the modified slurry.

[0078] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0079] Preparation Example 16

[0080] The difference between Preparation Example 16 and Preparation Example 6 is as follows: Step 1: 0.4 kg of polyvinyl alcohol fiber and 9.43 kg of deionized water are added to a stirrer and mixed at 300 r / min for 10 min. Then the mixture is heated to 90°C and kept at a constant temperature for 1 h. Next, 0.1 kg of polyamide epichlorohydrin, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer are added. The mixture is kept at a constant temperature and stirred continuously for 10 min to obtain the modified slurry.

[0081] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0082] Preparation Example 17

[0083] The difference between Preparation Example 17 and Preparation Example 6 is as follows: Step 1: 0.4 kg of modified starch from Preparation Example 1, 0.4 kg of polyvinyl alcohol fiber and 9.13 kg of deionized water are added to a stirrer and mixed at 300 r / min for 10 min. Then the mixture is heated to 90°C and kept at a constant temperature for 1 h. Next, 0.05 kg of amphoteric polyacrylamide and 0.02 kg of alkyl ketene dimer are added, and the mixture is kept at a constant temperature and stirred for 10 min to obtain the modified slurry.

[0084] Step 2: Maintain the temperature of the modified pulp at 90℃, and sizing the paper in a sizing machine. Then, equilibrate for 30 hours in a constant temperature and humidity environment of 20℃ and 65% relative humidity to obtain the modified paper.

[0085] Example

[0086] Example 1

[0087] A process for preparing paper-like yarn includes the following steps:

[0088] Step 1: Take the modified paper from Preparation Example 6, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0089] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0090] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0091] Example 2

[0092] The difference between Example 2 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 7, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm;

[0093] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0094] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0095] Example 3

[0096] The difference between Example 3 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 8, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0097] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0098] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0099] Example 4

[0100] The difference between Example 4 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 9, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0101] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0102] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0103] Example 5

[0104] The difference between Example 5 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 10, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0105] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0106] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0107] Example 6

[0108] The difference between Example 6 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 11, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0109] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0110] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0111] Example 7

[0112] The difference between Example 7 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 12, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0113] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0114] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0115] Example 8

[0116] The difference between Example 8 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 13, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0117] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0118] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0119] Example 9

[0120] The difference between Example 9 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 14, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0121] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0122] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0123] Comparative Example

[0124] Comparative Example 1

[0125] The difference between Comparative Example 1 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 15, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0126] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0127] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0128] Comparative Example 2

[0129] The difference between Comparative Example 2 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 16, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0130] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0131] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0132] Comparative Example 3

[0133] The difference between Comparative Example 3 and Example 1 is as follows: Step 1: Take the modified paper from Preparation Example 17, and then cut the modified paper to obtain modified paper pieces with a width of 1.5 mm.

[0134] Step 2: Twist the modified paper sheets to obtain modified paper sheet yarn, with 100 twisted ends, a twist of 700 twists / m, and a twist direction of Z twist;

[0135] Step 3: Ply the two modified paper yarns together to obtain the yarn body with a twist of 900 twists / m and an S-twist direction.

[0136] Performance testing

[0137] 1. Breaking strength: According to GB / T3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles (CRE method)", the breaking strength of Examples 1-9 and Comparative Examples 1-3 was tested using a YG023B fully automatic single yarn strength tester.

[0138] 2. Elongation at break: According to GB / T3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles (CRE method)", the elongation at break of Examples 1-9 and Comparative Examples 1-3 was tested using a YG023B fully automatic single yarn strength tester.

[0139] Table 1 Performance tests of Examples 1-9 and Comparative Examples 1-3

[0140]

[0141]

[0142] As can be seen from Examples 1-5 and Table 1, the modified starch prepared with different mass ratios of pea starch, sodium hydroxide, and chloroacetic acid has different effects on the modification of washi paper. When pea starch or chloroacetic acid is in excess, it will have a negative impact on the performance of the modified starch, thereby reducing the effect of improving the breaking strength and elongation at break of washi paper. Taking all factors into consideration, the mass ratio of pea starch, sodium hydroxide, and chloroacetic acid in the modified starch used in Example 5 is optimal.

[0143] Based on Examples 6-9 and Comparative Examples 1-3, and referring to Table 1, it can be seen that different mass ratios of modified starch, polyvinyl alcohol fiber, and polyamide epichlorohydrin result in different modification effects on washi paper after sizing. Excessive amounts of modified starch or polyamide epichlorohydrin negatively impact the performance of the modified starch, thereby reducing the improvement effect on the breaking strength and elongation at break of the washi paper. Considering all factors, the modified slurry in Example 9 has the best modification effect on washi paper, and the prepared paper yarn exhibits the best performance.

[0144] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A paper yarn, characterized by: The yarn body is twisted by modified paper sheet yarn, the modified paper sheet yarn is twisted by modified and paper sheet, the modified and paper sheet is cut by modified and paper, the modified and paper is made by sizing and paper with modified pulp, the modified pulp is made by the following raw materials: 4-8 parts of modified starch, 2-6 parts of polyvinyl alcohol fiber, 1-3 parts of polyamide epichlorohydrin, 0.25-0.75 parts of amphoteric polyacrylamide, 0.1-0.3 parts of alkyl enone dimer, 90-100 parts of deionized water; The modified starch is made by the following raw materials: 15-17 parts of pea starch, 4-7 parts of sodium hydroxide, 5.5-8.5 parts of chloroacetic acid; The mass ratio of the pea starch and the chloroacetic acid is 16.2:5.7-8.5, and the degree of substitution of the pea starch is 0.25; The mass ratio of the sodium hydroxide and the chloroacetic acid is 18-22:23.6; The preparation method of the modified starch comprises the following steps: uniformly dispersing the accurately measured pea starch, then adding the accurately measured sodium hydroxide, uniformly stirring, reacting at 25-35 DEG C for 25-35 min, then adding the accurately measured chloroacetic acid, uniformly stirring, and heating to 55-65 DEG C, reacting for 5-7 h, then washing with anhydrous ethanol, and finally drying at 90-100 DEG C for 4-6 h to obtain the modified starch; The mass ratio of the modified starch, the polyvinyl alcohol fiber and the polyamide epichlorohydrin is 6:4:2-3.

2. A paper yarn according to claim 1, characterized in that: The modified and paper is made by the following steps: Step 1: accurately measured modified starch, polyvinyl alcohol fiber and deionized water are mixed and stirred, heated to 90-100 DEG C, then kept at constant temperature for 1-1.5 h, then accurately measured polyamide epichlorohydrin, amphoteric polyacrylamide and alkyl enone dimer are added, kept at constant temperature, and continuously stirred for 5-10 min to obtain the modified pulp; Step 2: the temperature of the modified pulp is kept at 90-100 DEG C, the and paper is sized, then balanced at a constant temperature and humidity environment of 18-22 DEG C and 60-70% relative humidity for 24-36 h to obtain the modified and paper.

3. A process for the production of a paper yarn according to any one of claims 1-2, characterized in that: The following steps are included: Step 1: take the and paper, cut the modified and paper after sizing process to obtain the modified and paper sheet, and the width of the modified and paper sheet is 1-2 mm; Step 2: twist the modified and paper sheet to obtain the modified paper sheet yarn, the twisting number is 100-200, the twist is 700-900 twists / m, and the twist direction is Z twist; Step 3: twist two modified paper sheet yarns to obtain the yarn body, the twist is 900-1200 twists / m, and the twist direction is S twist.

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