A water-based ink for paper

Abstract

The invention discloses a water-based ink for paper, wherein the raw materials include, by mass percentage, 90-100% polyurethane dispersion, 0.5-1% defoamer, 2-5% wetting dispersant, 0.2-1% rheological additive and 5-10% filler, the sum of the mass percentages of the above components is 100%, the defoamer adopts the defoamer with the brand F-8936 or F-8982 produced by Aoshijia Material Technology (Shanghai) Co., Ltd.; the wetting dispersant adopts the dispersant with the brand DS-8005 produced by Aoshijia Material Technology (Shanghai) Co., Ltd. The ink of the invention has good flatness, and does not foam or drop powder.

Description

Technical Field

[0001] The invention relates to the technical field of inks, in particular to a water-based ink for paper. Background Art

[0002] Water-based ink is abbreviated as water-based ink. Water-based ink is particularly suitable for packaging and printing products with strict hygienic conditions such as tobacco, alcohol, food, beverages, medicines, and children's toys. At present, common problems are flocculation and powder loss caused by uneven dispersion of fillers, excessive foaming, easy shrinkage after defoaming, rough coating appearance and poor transparency, which ultimately makes the paper water-based ink have a smooth appearance without powder loss, less foaming during construction, and high film transparency and no shrinkage after coating. Therefore, how to solve the above technical problems is the direction that technicians in this field are committed to research. Summary of the invention

[0003] The object of the present invention is to provide a water-based ink for paper.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a water-based ink for paper, wherein the raw materials of the ink include, by mass percentage, 90-100% of a polyurethane dispersion, 0.5-1% of a defoamer, 2-5% of a wetting and dispersing agent, 0.2-1% of a rheological additive and 5-10% of a filler, and the sum of the mass percentages of the above-mentioned components is 100%. The defoamer is a defoamer of the brand F-8936 or F-8982 produced by Aoshijia Material Technology (Shanghai) Co., Ltd.; the wetting and dispersing agent is a dispersant of the brand DS-8005 produced by Aoshijia Material Technology (Shanghai) Co., Ltd.

[0005] As a specific implementation manner, the rheological additive is Aerosil 200 produced by BYK Chemical Co., Ltd.

[0006] As a specific implementation, the pH value of the polyurethane dispersion is 8 and the solid content is 35-40%.

[0007] As a specific implementation manner, the filler is one or any combination of nano calcium sulfate, nano barium sulfate, transparent talcum powder and transparent glass powder.

[0008] Compared with the prior art, the beneficial effects of the present invention are: the water-based ink for paper of the present invention has good flatness and does not bubble or drop powder. DETAILED DESCRIPTION

[0009] Unless the context clearly dictates otherwise, unmodified nouns and nouns modified by "the" include singular and plural referents.

[0010] As used in the specification and claims, the terms "comprises," "comprising," "having," "may," "containing," and variations thereof as used herein refer to open transitional phrases, terms, or words that require the presence of specified ingredients / steps and allow for the presence of other ingredients / steps. However, such descriptions should be interpreted as also describing compositions or methods as "consisting of" and "consisting essentially of" the recited ingredients / steps, which allows for the presence of only the specified ingredients / steps and any unavoidable impurities that may result therefrom, and excludes other ingredients / steps.

[0011] Numerical values ​​in the specification and claims of this application should be understood to include the same numerical values ​​when reduced to the same number of significant figures and numerical values ​​that differ from the stated value by less than the experimental error of ordinary measurement techniques of the type described in this application for determining the stated value.

[0012] All ranges disclosed herein are inclusive of the indicated endpoints and are independently combinable (eg, the range of "2 grams to 10 grams" includes the endpoints 2 grams and 10 grams, and all intermediate values).

[0013] The terms "about" and "approximately" can be used to include any numerical value that can be varied without changing the basic function of the value. When used with a range, "about" and "approximately" also disclose the range defined by the absolute values ​​of the two endpoints, for example, "about 2 to about 4" also discloses a range of "2 to 4". Generally, the terms "about" and "approximately" can refer to ±10% of the indicated number. However, for temperature, the term "approximately" refers to ±1°C.

[0014] Unless expressly stated otherwise, the percentages of elements are to be considered as percentages by weight of the alloy in question.

[0015] The invention provides a water-based ink for paper. The raw materials thereof include, by mass percentage, 90-100% of polyurethane dispersion, 0.5-1% of defoamer, 2-5% of wetting dispersant, 0.2-1% of rheological additive and 5-10% of filler, and the sum of the mass percentages of the above components is 100%.

[0016] Here, the defoaming agent used is the defoaming agent of brand F-8936 or F-8982 produced by Aoshijia Material Technology (Shanghai) Co., Ltd.; the wetting dispersant used is the dispersant of brand DS-8005 produced by Aoshijia Material Technology (Shanghai) Co., Ltd.; the rheological additive used is the rheological additive of brand Aerosil 200 produced by BYK Chemical Co., Ltd.

[0017] In addition, the pH value of the polyurethane dispersion is 8, and the solid content is 35-40%; the filler is one or any combination of nano calcium sulfate, nano barium sulfate, transparent talcum powder and transparent glass powder.

[0018] 1. Selection of defoaming agent

[0019] According to the mass percentage, 99.5% polyurethane dispersion and 0.5% defoamer are mixed evenly. In the blank case, the defoamer content is 0, the mass of the polyurethane dispersion is 100%, the pH value of the polyurethane dispersion here is 8, and the solid content is 40%. The specific model and performance test of the defoamer are shown in Table 1.

[0020] The detection method is as follows:

[0021]

[0022] Table 1

[0023] Defoaming agent Usage% Bubble height (mm) Shrinkage tendency Transparency blank / 16 5 5 F-8936 0.5 1 5 5- F-8982 0.5 1 5 5- F-1501 0.5 0 1 1

[0024] Note: In the properties of shrinkage tendency and transparency, 1: worst, 5: best, +: slightly better; -: slightly worse.

[0025] In addition, F-8936, F-8982, and F-1501 are all brands produced by Aosjia Materials Technology (Shanghai) Co., Ltd.

[0026] From Table 1, we can see that the defoamers F-8936 and F-8982 have better relative performance.

[0027] 2. Selection of wetting and dispersing agents

[0028] The distribution ratio of each group is shown in Table 2, and the unit of the numerical values ​​in Table 2 is %.

[0029] Table 2

[0030] Polyurethane dispersion 94.5 91.5 91.5 91.5 91.5 91.5 91.5 F-8936 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Dispersant A 3.0 Dispersant B 3.0 DS-8005 3.0 DS-2130 3.0 Dispersant C 3.0 Dispersant D 3.0 filler 5.0 5.0 5.0 5.0 5.0 5.0 5.0

[0031] Note: The pH value of the polyurethane dispersion here is 8 and the solid content is 40%.

[0032] Dispersant A is a 162 wetting and dispersing agent of the DISPERBYK series produced by BYK Chemie;

[0033] Dispersant B is a 167 wetting and dispersing agent from the DISPERBYK series produced by BYK Chemie;

[0034] Dispersant C is PB-711 dispersant of the Ajisper series produced by Ajinomoto Fine Chemicals Co., Ltd.

[0035] Dispersant D is PB-821 dispersant of the Ajisper series produced by Ajinomoto Fine Chemicals Co., Ltd.;

[0036] DS-8005 and DS-2130 are wetting and dispersing agents produced by Aosjia Materials Technology (Shanghai) Co., Ltd.

[0037] During preparation, the polyurethane dispersion, dispersant and filler are mixed evenly, and then the defoamer is added and mixed evenly.

[0038] The properties of the ink prepared from the raw material components in Table 2 are shown in Table 3.

[0039] Table 3

[0040] Wetting and dispersing agents Usage% Ink appearance Coating appearance Feel blank / Severe floating Even and smooth Loss of fans Dispersant A 3.0 float Dispersant B 3.0 Gather DS-8005 3.0 Slightly floating Even and smooth No powder loss DS-2130 3.0 Slightly floating Coarse particles No powder loss Dispersant C 3.0 float Dispersant D 3.0 float

[0041] It can be seen from Table 3 that the ink using dispersant DS-8005 has better performance.

[0042] 3. Evaluation of rheological additives

[0043] Table 4

[0044] Polyurethane dispersion 91.5 91.2 F-8982 0.5 0.5 DS-8005 3.0 3.0 Aerosil 200 0.3 filler 5.0 5.0

[0045] Here, transparent glass powder is used as filler, and the data unit in the table is %.

[0046] During preparation, the above substances are mixed evenly. The test results are shown in Table 5.

[0047] Table 5

[0048] Rheology additives Usage% Ink appearance Coating appearance Feel blank / float Even and smooth No powder loss Aerosil 200 0.3 Uniform Even and smooth No powder loss

[0049] From Table 5, we can see that the performance of the ink is better after adding the rheological additive Aerosil 200.

[0050] In summary, when other components are the same, choosing defoamer F-8936 or F-8982, wetting and dispersing agent DS-8005 and rheological additive Aerosil 200 will result in an ink with uniform appearance and no powder falling off.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-based ink for paper, characterized in that: The raw materials of the ink include, by mass percentage, 90-100% polyurethane dispersion, 0.5-1% defoamer, 2-5% wetting and dispersing agent, 0.2-1% rheological additive and 5-10% filler, and the sum of the mass percentages of the above components is 100%. The defoamer is F-8936 or F-8982 defoamer produced by Aoshijia Material Technology (Shanghai) Co., Ltd.; the wetting and dispersing agent is DS-8005 dispersant produced by Aoshijia Material Technology (Shanghai) Co., Ltd.

2. The water-based ink for paper according to claim 1, characterized in that: The rheological additive used is Aerosil 200 produced by BYK Chemical Co., Ltd.

3. The water-based ink for paper according to claim 1, characterized in that: The pH value of the polyurethane dispersion is 8 and the solid content is 35-40%.

4. The water-based ink for paper according to claim 1, characterized in that: The filler is one or any combination of nano calcium sulfate, nano barium sulfate, transparent talcum powder and transparent glass powder.

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