A watercolor ink

Abstract

The present application relates to a kind of watercolor ink, by weight component, including water 70-80 parts, polyvinylpyrrolidone 1-1.5 parts, sodium citrate 10-15, preservative 1-1.5 parts, color powder 4-5 parts, moisturizing anti-freezing agent 5-10 parts, citric acid 2-3 parts.The present application adds polyvinylpyrrolidone with K value in 12-15, when ink drop on fabric or skin, polyvinylpyrrolidone is wrapped around color powder, reduces the adhesion of color powder and fabric, skin, improves the washability of easy wash watercolor pen;By adding sodium citrate, form protective crystal after watercolor pen uncapped to delay the evaporation of moisture, the intermittent writing of traditional easy wash watercolor pen 2-3 hours is improved to 12 hours or more, while the protective crystal formed by sodium citrate and polyvinylpyrrolidone form synergistic effect, further improve the intermittent writing performance of watercolor pen, so as to solve the contradiction between easy wash performance and intermittent writing performance.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of watercolor ink for children drawing, coloring. BACKGROUND

[0002] Watercolor ink is a kind of color ink for children drawing, coloring, it has the characteristics of bright color, rich variety, and is loved by the majority of young children.But because the user is mainly children, often there are two problems: one is in the use of watercolor pen drawing, it will be stained on clothes, difficult to clean;Two is often forgotten to cover the pen cap after using watercolor pen, resulting in water evaporation, 2-3 hours ink will be blocked pen head, write again, intermittent writing performance is poor.

[0003] For the above problem one, the industry generally through adding a large number of easy-to-wash additives to solve the problem that children use watercolor pen ink stains on clothes, difficult to clean;For the above problem two, it is through adding a large number of humectants to improve the intermittent writing performance, humectants are glycerol, propylene glycol, polyethylene glycol, sorbitol, etc.But, there is no watercolor ink that can solve the problem of ink difficult to clean and intermittent writing at the same time.This is because if a large number of easy-to-wash additives and humectants are added to the watercolor ink at the same time, the ink solid content will increase, the water content will decrease, the color powder will reduce the solubility in the mixed solution of humectant, easy-to-wash additive, water, after taking off the cap, the color powder is easy to precipitate and block the pen head.Although it can be increased by reducing the amount of humectant, easy-to-wash additive, color powder to increase the water content, but reducing the humectant will lead to poor moisturizing effect, water evaporation, reducing the easy-to-wash additive will lead to poor washing performance, reducing the amount of color powder will lead to color fading, lose the bright color of watercolor ink.

[0004] In order to solve the above two problems, CN104559476A "an environmental protection easy-to-wash watercolor ink and its preparation method" solves the problem of ink difficult to clean by adding a large number of alkyl glycoside, tea saponin and other washing aids, but the water content is only 30-46 parts, and the watercolor pen will be blocked after taking off the cap, which cannot be written again.CN102153917A "a dye type washable watercolor ink and its manufacturing method" enhances its washability by adding xanthan gum, peach gum, gelatin, labab gum or their combination, but the amount of addition is only 0.1-0.5 parts by weight, the washing effect is still not ideal, and xanthan gum, peach gum, gelatin, labab gum have high thickening effect at low addition amount, after taking off the cap, the water evaporation, the ink viscosity is extremely high, which leads to the risk of ink flow.CN102010633A "a dye type non-dry watercolor ink and its manufacturing method" improves the intermittent writing problem by adding a complex humectant, but does not add any easy-to-wash component, which is difficult to clean on the fabric when using.

[0005] Therefore, further improvement is needed for the current watercolor ink. SUMMARY

[0006] The technical problem solved by the present application is to provide a watercolor ink that can improve the easy washing performance and intermittent writing performance.

[0007] The technical solution adopted by the present application to solve the above technical problem is:

[0008] A watercolor ink, by weight component, comprises:

[0009]

[0010] In the present application, the K value of the polyvinylpyrrolidone is 12-15. The polyvinylpyrrolidone can give the ink good easy washing performance. The polyvinylpyrrolidone with a K value of 12-15 has strong wrapping property for toner, reduces the adhesion of toner to fabric or skin, and makes the ink easier to wash. When the K value exceeds 15, the viscosity of the system increases, which can cause poor ink discharge. When the K value is less than 12, the toner cannot be effectively wrapped, which can cause the water washing performance of the ink to decrease. When the K value of the polyvinylpyrrolidone is 12-15, the addition ratio is 1-1.5. When the addition ratio is higher than 1.5, the viscosity of the ink is high, which can cause poor ink discharge. When the addition ratio is lower than 1, the viscosity of the ink is low, which can cause the pen tip to leak ink.

[0011] The sodium citrate in the present application mainly plays a role in extending the intermittent writing performance. After the watercolor pen is removed, the sodium citrate can form protective crystals in the gap on the surface of the pen tip to hinder the evaporation of water. When drawing again, the protective crystals can be removed through pressure and friction, and smooth writing can be continued. In addition, when forming protective crystals, the sodium citrate can form a synergistic effect with the polyvinylpyrrolidone, further reducing the adhesion of toner to skin and fabric (this is because: during the drying process of the ink, the sodium citrate gradually loses water to form crystals that are insoluble in polyvinylpyrrolidone, the crystals are precipitated on the surface of the polyvinylpyrrolidone, reducing the contact area between the polyvinylpyrrolidone and the skin and fabric, thereby reducing the adhesion), and improving the easy water washing performance of the ink.

[0012] The addition amount of sodium citrate in the present application is 10-15 parts. This is because: when the addition amount is less than 10 parts, the protective crystals are insufficient and cannot effectively hinder the evaporation of water; when the addition amount is higher than 15 parts, there are too many protective crystals, which can cause the intermittent writing performance to deteriorate.

[0013] The citric acid in the present application is used as a pH regulator. It makes the ink system acidic to weakly acidic, so that the sodium citrate, toner, and preservative can be stably dissolved in water, maintaining the stability of the entire solution system.

[0014] Preferably, the preservative is a mixture of sodium lactate, nisin, and sodium diacetate. Further preferably, the weight ratio of sodium lactate, nisin, and sodium diacetate is 1:(0.1-0.3):(0.5-1). With the above parameters, sufficient preservative performance is provided, and the preservative does not hinder the formation of the protective crystal of sodium citrate, thereby improving intermittent writing performance.

[0015] Preferably, the moisturizing anti-freezing agent is one or more of glycerol, propylene glycol, polyethylene glycol, and urea. The moisturizing anti-freezing agent mainly protects the ink in severe cold weather.

[0016] Compared with the prior art, the present application has the advantages that: by adding polyvinylpyrrolidone with a K value of 12-15, when the ink drops on fabric or skin, the polyvinylpyrrolidone wraps the toner, reduces the adhesion of the toner to the fabric or skin, and improves the washability of the washable watercolor pen; by adding sodium citrate, a protective crystal is formed after the watercolor pen is uncapped, water evaporation is delayed, the intermittent writing time of the traditional washable watercolor pen is increased from 2-3 hours to more than 12 hours, and the protective crystal formed by the sodium citrate and the polyvinylpyrrolidone form a synergistic effect, further improving the intermittent writing performance of the watercolor pen, thereby solving the contradiction between the washability and the intermittent writing performance. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with examples.

[0018] The watercolor ink of the present application comprises, by weight:

[0019]

[0020] In the present application, the K value of the polyvinylpyrrolidone is 12-15. The polyvinylpyrrolidone can impart good washability to the ink, the polyvinylpyrrolidone with a K value of 12-15 has strong wrapping properties for toner, reduces the adhesion of the toner to fabric or skin, and makes the ink easier to wash; when the K value exceeds 15, the viscosity of the system increases, which can cause poor ink discharge; when the K value is less than 12, the toner cannot be effectively wrapped, which can cause the washability of the ink to decrease. When the K value of the polyvinylpyrrolidone is 12-15, the addition ratio is 1-1.5, when the addition ratio is higher than 1.5, the viscosity of the ink is high, which can cause poor ink discharge; when the addition ratio is lower than 1, the viscosity of the ink is low, which can cause the pen tip to leak ink.

[0021] The sodium citrate of the embodiment of the present application mainly plays a role of prolonging intermittent writing performance. After the watercolor pen is taken off, the sodium citrate will form protective crystals in the gap on the pen head surface to hinder the evaporation of moisture. When drawing again, the protective crystals can be removed through pressure and friction effect, and smooth writing can be continued. In addition, when the protective crystals are formed, the sodium citrate can form a synergistic effect with the polyvinylpyrrolidone, further reducing the adhesion of the toner to the skin and fabric (during the drying process of the ink, the sodium citrate gradually loses water to form crystals that are insoluble in polyvinylpyrrolidone, the crystals are precipitated on the surface of the polyvinylpyrrolidone to reduce the contact area of the polyvinylpyrrolidone with the skin and fabric, thereby reducing the adhesion), and improving the easy washing performance of the ink.

[0022] The adding amount of the sodium citrate in the embodiment of the present application is 10-15 parts. This is because: when the adding amount is less than 10 parts, the protective crystals are insufficient, and cannot effectively hinder the evaporation of moisture; when the adding amount is more than 15 parts, too many protective crystals are formed, which can cause the intermittent writing performance to be poor.

[0023] The citric acid in the embodiment of the present application is used as a pH regulator. The ink system is acidic to weakly acidic, so that the sodium citrate, toner and preservative can be stably dissolved in water, and the stability of the whole solution system is maintained.

[0024] The preservative in the embodiment of the present application is a mixture of sodium lactate, nisin and sodium diacetate. Further preferably, the weight ratio of the sodium lactate, nisin and sodium diacetate is 1:(0.1-0.3):(0.5-1). With the above parameters, sufficient preservative performance can be provided, and the preservative will not hinder the formation of the protective crystals of the sodium citrate, thereby improving the intermittent writing performance.

[0025] The moisturizing and anti-freezing agent in the embodiment of the present application is one or more of glycerol, propylene glycol, polyethylene glycol and urea. The moisturizing and anti-freezing agent mainly plays a protective role on the ink in severe cold weather.

[0026] In the embodiment of the present application, the polyvinylpyrrolidone with a K value of 12-15 is added. When the ink drops on the fabric or skin, the polyvinylpyrrolidone wraps the toner to reduce the adhesion of the toner to the fabric and skin, and improve the easy washing performance of the easy-to-wash watercolor pen. The sodium citrate is added to form protective crystals after the watercolor pen is taken off, to delay the evaporation of moisture, and improve the intermittent writing performance of the traditional easy-to-wash watercolor pen from 2-3 hours to more than 12 hours. At the same time, the protective crystals formed by the sodium citrate form a synergistic effect with the polyvinylpyrrolidone, further improving the intermittent writing performance of the watercolor pen, thereby solving the contradiction between the easy washing performance and the intermittent writing performance.

[0027] Table 1 is the weight component ratio of the watercolor ink of Examples 1-10.

[0028] Table 1

[0029]

[0030] In Table 1, the preservative is a mixture of sodium lactate, nisin, and sodium diacetate, and the weight ratio of sodium lactate, nisin, and sodium diacetate is 1:0.2:0.8; the moisturizing anti-freezing agent is glycerol, and the color powder is a mixture of acid blue 9, acid red 52, and food yellow 4, and the weight ratio of acid blue 9, acid red 52, and food yellow 4 is 1:1:1.

[0031] According to the formula in Table 1, sodium citrate and polyvinylpyrrolidone were added to water and stirred until completely dissolved, then the color powder was added, and after the color powder was completely dissolved, citric acid, the moisturizing anti-freezing agent, and the preservative were sequentially added, and after being uniformly mixed, the mixture was filtered to prepare the easy-to-wash and dry watercolor ink. Then, the ink obtained above was injected into the core of a roll using a syringe, and assembled into a plastic part to prepare the easy-to-wash and dry watercolor pen.

[0032] The easy-to-wash and dry watercolor pen was subjected to performance testing, and the test content and standards are as follows:

[0033] 1. Intermittent writing property: After the pen sleeve of the test pen was removed and a line was drawn on the writing paper, the pen was placed in an environment with a temperature of (20±5) °C and a relative humidity of (65±5) %, and the time for which the pen could be written again was recorded;

[0034] 2. Easy-to-wash property: the watercolor pen was used to draw a straight line on SDC multi-fiber cloth, and then placed in warm water at a temperature of (40-50) °C and soaked in soap and washing powder for 15 minutes, and then rubbed and washed for 5 minutes, and the effect was compared,

[0035] O: no trace on the SDC cloth,

[0036] Δ: slight trace on the SDC cloth,

[0037] X: obvious trace on the SDC cloth;

[0038] 3. Writing performance: a straight line was drawn by hand at a line drawing speed of 20-25 mm / s to check whether the test pen was writing normally,

[0039] O: normal writing, no line fading or broken line phenomenon,

[0040] Δ: normal writing, slight line fading phenomenon,

[0041] X: abnormal writing, line fading, broken line, and other phenomena;

[0042] The test results are shown in Table 2.

[0043] Table 2

[0044]

[0045] From the test results of Table 2, it can be seen that when the total amount of sodium citrate is 10-15 parts, the ink has excellent intermittent writing performance; when the K value of polyvinylpyrrolidone is between 12-15 and the amount is 1-1.5 parts, the ink has excellent intermittent writing performance and writing performance. That is, when water is 70-80 parts, polyvinylpyrrolidone is 1-1.5 parts, sodium citrate is 10-15, preservative is 1-1.5 parts, color powder is 4-5 parts, moisturizing and anti-freezing agent is 5-10 parts, and citric acid is 2-3 parts, the prepared dry and easy-to-wash ink has excellent intermittent writing performance, can continue to write after being placed for 12H after the cap is removed, and the ink on the hands and fabrics can be easily washed with water.

Claims

1. A watercolor ink, characterized by: By weight components, including Water 70-80 parts, Polyvinylpyrrolidone 1-1.5 parts, Sodium citrate 10-15 parts, Preservative 1-1.5 parts, Moisturizing antifreeze 5-10 parts, Color powder 4-5 parts, Citric acid 2-3 parts; The K value of the polyvinylpyrrolidone is 12-15; In the ink in the drying process, sodium citrate gradually loses water to form crystals that are insoluble in polyvinylpyrrolidone, which precipitates to the surface of the polyvinylpyrrolidone to reduce the contact area of the polyvinylpyrrolidone with the skin fabric, thereby reducing its adhesion.

2. The watercolor ink according to claim 1, characterized in that: The preservative is a mixture of sodium lactate, streptococcal lactate, and sodium diacetate.

3. The watercolor ink according to claim 2, characterized in that: The weight ratio of the sodium lactate, streptococcal lactate, and sodium diacetate is 1: (0.1 ~ 0.3) : (0.5 ~ 1).

4. The watercolor ink according to claim 1 or 2 or 3, characterized in that: The moisturizing antifreeze is one or more of glycerol, propylene glycol, polyethylene glycol, and urea.

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