Method for controlling tail ink of gel pen to move towards pen point

Abstract

The invention relates to a method for controlling tail ink oil of a gel pen to move towards a pen point. The method is realized by controlling ink components and carrying out centrifugal treatment on an ink refill. The thickening agent with low shear degree and the thickening agent with high shear degree are compounded according to a specific proportion, so that the ink keeps certain viscosity when a refill is subjected to centrifugal force, the flowability of the ink is weakened, and tail oil is not prone to penetrating through the ink to move to a pen point; meanwhile, the viscosity of the ink and the change condition of the viscosity when the ink is subjected to centrifugal force are well balanced through centrifugal treatment, the thixotropic value and the shearing force of the ink are regulated and controlled, and the movement of tail ink of the gel pen to a pen point is well controlled, so that the writing trace is ensured to flow out without being broken, and the writing trace is reasonable in thickness and easy to dry.

Description

Technical Field

[0001] The invention relates to a method for controlling the movement of gel pen ink tail oil toward the pen tip. Background Art

[0002] In a gel pen, it is necessary to ensure that the ink viscosity is high when it is still, so that no matter whether the gel pen is placed horizontally or vertically, it is not easy for the ink to flow out from the gap of the pen tip and stain clothes or paper.

[0003] During the writing process, the ball at the tip of the pen is constantly rolling, and the ink is carried to the paper by the rolling ball, thus forming a trace. Since the ink is subjected to shear force during the rolling process of the ball, and the ink is a non-Newtonian fluid, the viscosity of the ink will decrease as the shear force increases. Although the greatly reduced viscosity of the ink can make it flow out of the gap of the pen tip more smoothly and ensure that the writing trace flows out continuously, if the viscosity of the ink is reduced too much, it is easy to cause undesirable phenomena such as rough writing traces, traces that are difficult to dry, and dirty hands.

[0004] Therefore, the movement of ink tail oil to the pen tip in the current gel pen is a relatively unstable process, and a suitable control method needs to be developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for reasonably controlling the movement of the ink tail oil of a gel pen to the pen tip by balancing the thixotropic value of the ink and the shear force applied thereto in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A method for controlling the movement of gel pen ink tail oil to the pen tip,

[0008] According to the weight components, the gel pen ink comprises the following components:

[0009] Moisturizer, 24-36 parts;

[0010] Rust inhibitor, 0.1 to 1 part;

[0011] Lubricant, 0.1-3 parts;

[0012] Thickener, 0.5-3.0 parts;

[0013] Base, 1.0-3.0 parts;

[0014] Preservatives, 0.1-0.3 parts;

[0015] Color paste, 25-40 parts,

[0016] Water, 13-50 parts,

[0017] Wherein, the thickener is compounded by a low shear thickener and a high shear thickener;

[0018] After the gel pen ink is assembled into the pen core, the pen core is centrifuged at a speed of 800 to 1200 r / min.

[0019] In the present invention, the thickener is an acrylic thickener. Preferably, the thickener is compounded by thickener A and thickener B, wherein thickener A is a high shear thickener selected from Dow TT-935 thickener; the thickener B is a low shear thickener selected from sodium carboxymethyl cellulose CMC of Renqiu Gongxin Chemical Technology Co., Ltd., and further preferably, the mass ratio of thickener A to thickener B is (7-11):1. Thickeners with different shear degrees have different reductions in viscosity after being subjected to force. The present invention compounds a low shear acrylic thickener with a high shear acrylic thickener in a specific ratio, which can make the ink maintain a certain viscosity when the pen core is subjected to centrifugal force, weaken the fluidity of the ink, and make it difficult for the tail oil to pass through the ink and move to the tip of the pen.

[0020] As an improvement, the mass ratio of thickener A to thickener B is 9:1, the mass content of thickener A in gel pen ink is 1.8%, and the mass content of thickener B in gel pen ink is 0.2%. Preferably, the centrifugal treatment is carried out without negative pressure, and the centrifugal treatment time is 50 to 100 minutes. Further preferably, the centrifugal treatment speed is 1000r / min, and the centrifugal treatment time is 60 minutes. The present invention controls the viscosity of the ink by compounding the above-mentioned thickeners, so that the tail oil is not easy to pass through the ink to move to the tip of the pen. However, during the writing process, the ball of the gel pen core is constantly rolling, and the ink is brought to the paper by the rolling ball to form a trace. During the rolling process of the ball, the ink will be subjected to shear force, and the ink is a non-Newtonian fluid. It will reduce the viscosity as the shear force increases, which makes it difficult to achieve the control of tail oil movement during dynamic writing by only controlling the viscosity of the ink. Based on this, the present invention further regulates the shear force to which the ink will be subjected through a centrifugal treatment method. When the centrifugal treatment speed is 1000r / min, the centrifugal treatment time is 60min, and no negative pressure is applied, the viscosity of the ink and the change in viscosity of the ink when it is subjected to centrifugal force can be well balanced, and the movement of the tail oil of the neutral pen ink to the pen tip can be controlled, thereby ensuring that the writing lines flow out uninterruptedly, and the writing lines are of reasonable thickness and easy to dry.

[0021] Preferably, the moisturizer is compounded by moisturizer A, moisturizer B, and moisturizer C, wherein the moisturizer A is selected from glycerin and propylene glycol; the moisturizer B is selected from sorbitol, urea, and polyethylene glycol; and the moisturizer C is selected from amino acids, PCA, sodium lactate, and polyethylene glycol.

[0022] More preferably, the mass contents of the moisturizing agent A, moisturizing agent B and moisturizing agent C in the gel pen ink are 4% to 6%, 5% to 8% and 15% to 22% respectively.

[0023] The composition of the above-mentioned moisturizers is as follows: moisturizer A has an antifreeze effect, moisturizer B is rich in hydrophilic functional groups and can absorb and retain moisture, and moisturizer C not only has a moisturizing effect but also has a partial lubricating effect.

[0024] Preferably, the rust inhibitor is one or more of lubricating oil, cutting fluid, and benzotriazole;

[0025] The lubricant is one or more of isomeric tridecanol ether phosphate;

[0026] The base is triethanolamine;

[0027] The preservative is one or more of benzoic acid and its salts, sorbic acid and its salts, and phenylisothiazoline series;

[0028] The color paste is a water-based neutral color paste.

[0029] Compared with the prior art, the advantages of the present invention are as follows: the present invention compounds a low-shear thickener and a high-shear thickener in a specific ratio, so that when the ink core is subjected to centrifugal force, the ink maintains a certain viscosity, weakens the fluidity of the ink, and makes it difficult for the tail oil to pass through the ink and move to the pen tip; at the same time, the viscosity of the ink and the change in the viscosity of the ink when the ink is subjected to centrifugal force are well balanced through centrifugal treatment, the thixotropic value of the ink and the shear force it is subjected to are regulated, and the movement of the tail oil of the neutral pen ink to the pen tip is controlled, thereby ensuring that the writing line flows out continuously, and the writing line thickness is reasonable and easy to dry. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the embodiments.

[0031] The method for controlling the movement of gel pen ink tail oil to the pen tip in the embodiment of the present invention is achieved by controlling the ink components and centrifuging the ink pen core.

[0032] According to the weight components, the neutral pen ink includes the following components:

[0033] Moisturizer, 24-36 parts;

[0034] Rust inhibitor, 0.1 to 1 part;

[0035] Lubricant, 0.1-3 parts;

[0036] Thickener, 0.5-3.0 parts;

[0037] Base, 1.0-3.0 parts;

[0038] Preservatives, 0.1-0.3 parts;

[0039] Color paste, 25-40 parts,

[0040] Water, 13-50 parts,

[0041] Wherein, the thickener is compounded by a low shear thickener and a high shear thickener;

[0042] After the neutral pen ink is assembled into the refill, the refill is centrifuged at a speed of 800 to 1200 r / min. The thickener is an acrylic thickener. The thickener is compounded by thickener A and thickener B, wherein thickener A is a high shear thickener selected from Dow TT-935 thickener; thickener B is a low shear thickener selected from sodium carboxymethyl cellulose CMC of Renqiu Gongxin Chemical Technology Co., Ltd., and the mass ratio of thickener A to thickener B is (7 to 11):1. Thickeners with different shear degrees have different reductions in viscosity after being subjected to force. The present invention compounds a low shear acrylic thickener with a high shear acrylic thickener in a specific ratio, so that the ink can maintain a certain viscosity when the refill is subjected to centrifugal force, weaken the fluidity of the ink, and make it difficult for the tail oil to pass through the ink and move to the tip of the pen.

[0043] The mass ratio of thickener A to thickener B is 9:1, the mass content of thickener A in gel pen ink is 1.8%, and the mass content of thickener B in gel pen ink is 0.2%. The centrifugal treatment is carried out without negative pressure, and the centrifugal treatment time is 50 to 100 min. Further preferably, the centrifugal treatment speed is 1000 r / min, and the centrifugal treatment time is 60 min. This embodiment controls the viscosity of the ink by compounding the above-mentioned thickeners, so that the tail oil is not easy to pass through the ink to move to the tip of the pen. However, during the writing process, the ball of the gel pen core is constantly rolling, and the ink is brought to the paper by the rolling ball to form a trace. During the rolling process of the ball, the ink will be subjected to shear force, and the ink is a non-Newtonian fluid. It will reduce the viscosity as the shear force it receives increases, which makes it difficult to achieve the tail oil movement control during the dynamic writing process by controlling the ink viscosity alone. Based on this, this embodiment further regulates the shear force to which the ink will be subjected through centrifugal treatment. When the centrifugal treatment speed is 1000r / min, the centrifugal treatment time is 60min, and no negative pressure is applied, the ink viscosity and the change in viscosity of the ink when it is subjected to centrifugal force can be well balanced, and the movement of the tail oil of the neutral pen ink to the pen tip can be controlled, thereby ensuring that the writing lines flow out uninterruptedly, and the writing lines are of reasonable thickness and easy to dry.

[0044] The moisturizer is compounded by moisturizer A, moisturizer B and moisturizer C, wherein moisturizer A is selected from glycerin and propylene glycol; moisturizer B is selected from sorbitol, urea and polyethylene glycol; moisturizer C is selected from amino acid, PCA, sodium lactate and polyethylene glycol. The mass contents of moisturizer A, moisturizer B and moisturizer C in gel pen ink are 4% to 6%, 5% to 8% and 15% to 22% respectively.

[0045] The rust inhibitor of this embodiment is one or more of lubricating oil, cutting fluid, and benzotriazole; the lubricant is one or more of isomeric tridecyl ether phosphate; the base is triethanolamine; the preservative is one or more of benzoic acid and its salts, sorbic acid and its salts, and phenylisothiazoline series; and the color paste is a water-based neutral color paste.

[0046] The method for processing a gel pen capable of controlling the movement of the ink tail oil to the pen tip in this embodiment is as follows:

[0047] Example:

[0048] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0049] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener A (Dow TT-935 thickener) 0.5%, thickener B (Renqiu Gongxin Chemical Technology Co., Ltd. sodium carboxymethyl cellulose CMC) 1.5%, stir for 30 minutes, test its pH value, add alkali (American Dow pH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Shandong Kasong New Materials Co., Ltd. Sandan Oil BK) and color paste (Namei New Materials Co., Ltd. M-JHK-33), adjust the stirring speed to 500r / min, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0050] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 1000rmin, time: 60min, normal pressure. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0051] Comparative Example 1:

[0052] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0053] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) 2.0%, stir for 30 minutes, test its pH value, add alkali (American Dow pH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Sandan Oil BK from Shandong Kasong New Materials Co., Ltd.) and color paste (M-JHK-33 from Nami New Materials Co., Ltd.), adjust the stirring speed to 500r / min, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0054] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 1000rmin, time: 60min, normal pressure. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0055] Comparative Example 2:

[0056] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0057] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test its pH value, add alkali (Dow PH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener (Dow TT-935 thickener) 2.0%, stir for 30 minutes, test its pH value, add alkali (Dow PH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Sandan Oil BK from Shandong Kasong New Materials Co., Ltd.) and color paste (M-JHK-33 from Nami New Materials Co., Ltd.), adjust the stirring speed to 500r / min, test its pH value, add alkali (Dow PH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0058] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 1000rmin, time: 60min, normal pressure. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0059] Comparative Example 3:

[0060] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0061] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test the pH value, add alkali (Dow PH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener A (BASF HS1212) 0.5%, thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) 1.5%, stir for 30 minutes, test its pH value, add alkali (US Dow pH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Sandan Oil BK from Shandong Kasong New Materials Co., Ltd.) and color paste (M-JHK-33 from Nami New Materials Co., Ltd.), adjust the stirring speed to 500r / min, test its pH value, add alkali (US Dow pH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0062] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 1000rmin, time: 60min, normal pressure. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0063] Comparative Example 4:

[0064] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0065] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener A (Dow TT-935 thickener) 0.5%, thickener B (Renqiu Gongxin Chemical Technology Co., Ltd. sodium carboxymethyl cellulose CMC) 1.5%, stir for 30 minutes, test its pH value, add alkali (American Dow pH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Shandong Kasong New Materials Co., Ltd. Sandan Oil BK) and color paste (Namei New Materials Co., Ltd. M-JHK-33), adjust the stirring speed to 500r / min, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0066] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 200rmin, time: 60min, normal pressure. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0067] Comparative Example 5:

[0068] Add water, moisturizer A (PEG-300 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer B (PEG-600 from Hai'an Petrochemical Plant, Jiangsu Province), moisturizer C (propylene glycol from Shandong Jintai Hongfa Biotechnology Co., Ltd.), and rust inhibitor (benzotriazole from Germany) at room temperature, turn on the stirrer at a stirring speed of 380 r / min, and stir for 30 min until the rust inhibitor is completely dissolved;

[0069] Add lubricant (isotridecyl phosphate), stir for 5 minutes, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, and adjust the pH value to 8.3-8.6. Add thickener A (Dow TT-935 thickener) 0.5%, thickener B (Renqiu Gongxin Chemical Technology Co., Ltd. sodium carboxymethyl cellulose CMC) 1.5%, stir for 30 minutes, test its pH value, add alkali (American Dow pH regulator triethanolamine) while stirring, and adjust the pH value to 8.3-8.6. Add preservative (Shandong Kasong New Materials Co., Ltd. Sandan Oil BK) and color paste (Namei New Materials Co., Ltd. M-JHK-33), adjust the stirring speed to 500r / min, test its pH value, add alkali (American Dow pH regulator Angus AMP-95) while stirring, adjust the pH value to 8.3-8.6, and stir for 60 minutes;

[0070] Add thickener B (sodium carboxymethyl cellulose CMC from Renqiu Gongxin Chemical Technology Co., Ltd.) to fine-tune the ink to the standard viscosity (850-1000mpa.s), add water to 100%, and stir for 60 minutes. After filtering the ink and degassing under negative pressure, test the physical and chemical properties of the ink. If it meets the requirements, it can be filled. After the ink is filled and forms the refill, use a centrifuge for centrifugal treatment, speed: 1000rmin, time: 60min, negative pressure: -0.3Mpa. After being placed at room temperature for 24 hours, the refill is placed flat in a high temperature box (50℃ / 60%).

[0071] The performance of the products of the embodiments of the present invention and the comparative examples was evaluated, and the results are shown in Table 1.

[0072] Table 1

[0073]

[0074] From Table 1 we can see that:

[0075] The embodiment of the present invention is the optimal solution for the combination of thickener and centrifugal process, which not only reduces the defective rate of the end oil of the pen tip to 0%, but also makes the writing line trace, drying time and ink leakage of the pen core relatively ideal;

[0076] Comparative Example 1 Compared with the embodiment, the amount of high shear thickener is increased to the low shear thickener, which causes the viscosity of the pen core to decrease rapidly when subjected to external force (centrifugation, writing, pen core falling, etc.), and the tail oil is more likely to pass through the ink and flow into the pen head, so the tail oil defect rate of the pen head increases to 10%. When writing, because the ink viscosity is reduced, the ink output speed is faster, the ink output is larger, the writing line is thick, and the line is not easy to dry. Consumers can easily get their hands dirty when writing;

[0077] Comparative Example 2 Compared with the embodiment, the amount of low shear thickener is increased to the high shear thickener, which results in a lower viscosity of the ink when the ink is in a static state, and the risk of ink leakage from the pen tip increases. When subjected to external forces (centrifugation, writing, pen core falling, etc.), the viscosity remains almost unchanged, resulting in a reduced ink output and a slightly lighter line.

[0078] Compared with the embodiment, in Comparative Example 3, the amount of high shear thickener is increased to the amount of medium shear thickener. Under the same external force, the viscosity of the low shear thickener decreases rapidly, the high shear viscosity remains almost unchanged, and the medium shear viscosity changes between the two. Therefore, the effect of Comparative Example 3 is between that of the embodiment and Comparative Example 1.

[0079] Comparative Example 4 Compared with the embodiment, the rotation speed in the centrifugal process is reduced from 1000r / min to 200r / min, and the bubbles generated in the production process of the pen core cannot be discharged, resulting in the small bubbles in the pen core to gather and grow over time, and even to fracture, which will cause the stitches to be intermittent during the writing process, bringing a bad experience to consumers;

[0080] Compared with the embodiment, in Comparative Example 5, the pressure in the centrifugal process is changed from normal pressure to -0.3 MPa, which will cause the pen core to be subjected to a greater force during the centrifugal process, thereby causing the pen core to bend and resulting in a poor appearance.

Claims

1. A method for controlling the movement of the ink tail of a gel pen toward the pen tip, characterized in that: According to the weight components, the gel pen ink comprises the following components: Moisturizer, 24-36 parts; Rust inhibitor, 0.1 to 1 part; Lubricant, 0.1-3 parts; Thickener, 0.5-3.0 parts; Base, 1.0-3.0 parts; Preservatives, 0.1-0.3 parts; Color paste, 25-40 parts, Water, 13-50 parts, Wherein, the thickener is compounded by a low shear thickener and a high shear thickener; After the gel pen ink is assembled into the pen core, the pen core is centrifuged at a speed of 800 to 1200 r / min.

2. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 1, characterized in that: The thickener is an acrylic thickener.

3. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 2, characterized in that: The thickener is compounded by thickener A and thickener B, wherein the thickener A is a low shear thickener selected from TT-935 thickener; and the thickener B is a high shear thickener selected from sodium carboxymethyl cellulose.

4. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 3, characterized in that: The mass ratio of thickener A to thickener B is (7-11):

1.

5. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 3, characterized in that: The mass ratio of the thickener A to the thickener B is 9:1, the mass content of the thickener A in the gel pen ink is 1.8%, and the mass content of the thickener B in the gel pen ink is 0.2%.

6. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 1, characterized in that: The centrifugal treatment is carried out without negative pressure, and the centrifugal treatment time is 50 to 100 minutes.

7. The method for controlling the movement of gel pen ink tail oil to the pen tip according to claim 6, characterized in that: The centrifugal treatment speed is 1000r / min, and the centrifugal treatment time is 60min.

8. The method for controlling the movement of gel pen ink tail oil to the pen tip according to any one of claims 1 to 7, characterized in that: The moisturizer is compounded by moisturizer A, moisturizer B and moisturizer C, wherein the moisturizer A is selected from glycerin and propylene glycol; the moisturizer B is selected from sorbitol, urea and polyethylene glycol; and the moisturizer C is selected from amino acids, PCA, sodium lactate and polyethylene glycol.

9. The method for controlling the movement of the ink tail of a gel pen toward the pen tip according to claim 8, characterized in that: The mass contents of the moisturizing agent A, moisturizing agent B and moisturizing agent C in the gel pen ink are 4% to 6%, 5% to 8% and 15% to 22% respectively.

10. The method for controlling the movement of gel pen ink tail oil to the pen tip according to any one of claims 1 to 7, characterized in that: The rust inhibitor is one or more of lubricating oil, cutting fluid and benzotriazole; The lubricant is one or more phosphate esters with different structures; The base is triethanolamine; The preservative is one or more of benzoic acid and its salts, sorbic acid and its salts, and phenylisothiazoline series; The color paste is a water-based neutral color paste.

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