Ink varnish as well as preparation method and application thereof

Abstract

The invention relates to the technical field of varnish, in particular to the field of IPC C09D11, and more particularly relates to varnish as well as a preparation method and application thereof. The paint comprises PVB resin, aldehyde ketone resin, rosin resin, CAB resin, a wax emulsion, an antifoaming agent, a leveling agent and ethanol. According to the tipping paper varnish disclosed by the invention, the components are reasonably matched and complement each other; the coating has good wear resistance, temperature resistance, adhesion performance and the like; the printing ink is suitable for tipping paper printing ink, metal printing ink and common color ink varnish, product types can be effectively reduced, the risk of product errors is reduced, and the yield of products is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of varnishing oil, in particular to the field of IPC C09D11, and more specifically to a varnishing oil and a preparation method and application thereof. Background Art

[0002] Varnish is widely used in various ink products. The current varnish products on the market are divided into the following categories: acrylic, cellulose, aldehydes and ketones, and epoxy vinyl. The production method is to use the above resins as the main body and formulate with other various additives. However, the current products on the market are difficult to take into account the wear resistance, temperature resistance, adhesion performance and surface printing effect.

[0003] CN108264797B discloses a gravure pearlescent varnish for tipping paper and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 5-25 parts of polyvinyl butyral resin, 5-20 parts of cellulose acetate butyrate, 1-10 parts of aldehyde-ketone resin, 1-10 parts of rosin glycerol ester, 1-10 parts of anti-precipitation agent, and 50-80 parts of solvent. The gravure pearlescent varnish of the present invention has a reasonable combination of a variety of non-toxic and transparent resins in the formula components, and is synthesized by a blending process. The varnish has the characteristics of good gloss, excellent pearlescent pigment wet dispersion and directional arrangement performance, strong bonding adhesion, good printing adaptability, etc. However, the invention does not involve wear resistance and high temperature resistance. Summary of the invention

[0004] The first aspect of the present invention provides a varnish, the components of which include: PVB resin (polyvinyl butyral), aldehyde-ketone resin, rosin resin, CAB resin (cellulose acetate butyrate), wax emulsion, defoamer, leveling agent and ethanol.

[0005] The components include, by weight: 10-30 parts of PVB resin, 3-15 parts of aldehyde-ketone resin, 1-8 parts of rosin resin, 1-5 parts of CAB resin, 0.5-5 parts of wax emulsion, 0.5-2 parts of defoaming agent, 0.5-2 parts of leveling agent and 50-100 parts of ethanol.

[0006] The viscosity of the PVB resin at 20° C. (measured using a Brookfield viscometer and a 10 wt % PVB ethanol solution) is 3-15 seconds.

[0007] Preferably, the viscosity of the PVB resin at 20° C. (measured using a Brookfield viscometer, measured with a 10 wt % PVB ethanol solution) is 3-7 seconds.

[0008] The aldehyde-ketone resin has a softening point of 80-120° C. and a hydroxyl value of 25-55 mgKOH / g.

[0009] Preferably, the aldehyde-ketone resin has a softening point of 90-110° C. and a hydroxyl value of 30-55 mgKOH / g.

[0010] The present application has found that by adding PVB resin and aldehyde-ketone resin at the same time, and limiting the viscosity of PVB resin at 20°C to 3-15 seconds, the softening point of aldehyde-ketone resin to 80-120°C, and the hydroxyl value to 25-55 mgKOH / g, the water resistance and heat resistance of the ink varnish can be improved. PVB resin has a high solubility in ethanol. With the increase of viscosity, the molecular weight increases, and the heat resistance improves. However, the flexible segments in the PVB resin limit the further improvement of its strength, and the excessive viscosity is also prone to its dispersibility in the system. The addition of aldehyde-ketone resin with a specific softening point provides a saturated ring structure for the system, providing heat resistance, and at the same time has excellent dispersibility with PVB resin of a specific viscosity, further shortening the pores between the segments and improving water resistance.

[0011] Further research found that the weight ratio of the PVB resin to the aldehyde-ketone resin is (1.5-4): 1, which can improve the wear resistance and adhesion performance of the ink. It may be that the flexible segments in the PVB resin form a strong anchoring effect with the surface of the substrate, and the ring structures in the aldehyde-ketone resin are interlaced between the flexible segments, providing support for the formed anchoring structure. At the same time, the pores between the ring structures in the aldehyde-ketone resin are just distributed with the flexible segments in the PVB resin, which further improves the stability of the ink layer structure, reduces the interlayer slip effect under shear force, and thus improves the wear resistance of the ink.

[0012] The weight ratio of the PVB resin to the aldehyde-ketone resin is (1.5-4):1.

[0013] Preferably, the weight ratio of the PVB resin to the aldehyde-ketone resin is (2-3):1.

[0014] The weight ratio of the rosin resin, CAB resin and wax emulsion is (1.5-2.5):1:(0.5-3).

[0015] Preferably, the weight ratio of the PVB resin to the aldehyde-ketone resin is (1.6-2):1:(0.5-1).

[0016] The present application study found that the weight ratio of the rosin resin, CAB resin and wax emulsion is (1.5-2.5):1:(0.5-3), which can effectively improve the surface printing effect, make the surface flat and smooth, and the pattern clear during the printing process. The rosin resin can play a viscosity-increasing effect and improve the cohesive performance of the ink layer. However, excessive addition of rosin resin can easily lead to reduced system stability. The addition of wax emulsion, in which polyethylene wax can improve the stability of the system, may be to promote the dispersion effect between rosin resin, CAB resin and PVB resin and aldehyde-ketone resin. At the same time, when applied to tipping paper, polyethylene wax can also reduce the friction between tipping paper and guide roller, thereby improving the adhesion performance of tipping paper.

[0017] The rosin resin includes rosin-modified maleic acid resin.

[0018] Preferably, the wax emulsion contains polyethylene wax.

[0019] Preferably, the leveling agent includes a water-based polyacrylate leveling agent.

[0020] Preferably, the defoaming agent comprises a silicone polyether modified defoaming agent.

[0021] Further research found that the leveling agent includes a water-based polyacrylate leveling agent, and the combined defoaming agent includes a silicone polyether modified defoaming agent, which can improve the compatibility with the tipping paper ink. It may be that the wood grain surface of the tipping paper and its certain water resistance affect the adhesion and flatness of the ink, while the water-based polyacrylate leveling agent and the silicone polyether modified defoaming agent improve the wettability and compatibility of the coating with the tipping paper.

[0022] A second aspect of the present invention provides a method for preparing varnish, comprising the following steps:

[0023] S1, adding PVB resin, aldehyde-ketone resin, rosin resin, CAB resin, and wax emulsion to part of ethanol in sequence while stirring to obtain a mixture;

[0024] S2, stirring the mixture until dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging to obtain.

[0025] The part of ethanol accounts for 60-80% of the total amount of ethanol.

[0026] The linear speed of the stirring paddle in step S1 is 10-20 m / min, and the linear speed of the stirring paddle in step S2 is 30-40 m / min.

[0027] Preferably, the partial ethanol accounts for 65-80% of the total ethanol.

[0028] The third aspect of the present invention provides an application of varnish, which is applied to one of tipping paper ink, metallic ink and common color ink.

[0029] Beneficial Effects

[0030] 1. Add PVB resin and aldehyde-ketone resin at the same time, and limit the viscosity of PVB resin at 20°C to 3-15 seconds, the softening point of aldehyde-ketone resin to 80-120°C, and the hydroxyl value to 25-55 mgKOH / g. This can improve the water resistance and heat resistance of the varnish.

[0031] 2. The weight ratio of the PVB resin to the aldehyde-ketone resin is (1.5-4):1, which can improve the wear resistance and adhesion performance of the ink.

[0032] 3. The varnish prepared in the present application is suitable for tipping paper ink, including metallic ink and ordinary color ink varnish, which can effectively reduce product types, reduce the risk of product errors, and improve product yield.

[0033] 4. The weight ratio of the rosin resin, CAB resin and wax emulsion is (1.5-2.5):1:(0.5-3), which can effectively improve the surface printing effect, making the surface flat and smooth and the pattern clear during the printing process.

[0034] 5. The leveling agent includes a water-based polyacrylate leveling agent, and the combined defoaming agent includes a silicone polyether modified defoaming agent, which can improve the compatibility with the tipping paper ink. DETAILED DESCRIPTION

[0035] Examples 1-3, Comparative Examples 1-5

[0036] A varnish, the components of which are shown in Table 1 in parts by weight:

[0037] Table 1

[0038]

[0039] The PVB resin manufacturer is Hunan Huaihua 5 Second PVB; the aldehyde and ketone resin manufacturer is BASF, model A81; the rosin resin manufacturer is Fujian Xingli New Materials Co., Ltd., model 886A; CAB resin Eastman Chemical CAB-553-0.4; the wax emulsion manufacturer is Guangzhou Sanxing High-tech Materials, model A-172; the defoamer manufacturer is Dongguan Defeng Defoamer Co., Ltd., model DF-2307; the leveling agent manufacturer is BYK381; and the ethanol is conventional anhydrous ethanol on the market.

[0040] Wherein, Examples 1-3 and Comparative Examples 4-5 are a method for preparing varnish, comprising the following steps:

[0041] S1, adding PVB resin, aldehyde-ketone resin, rosin resin, CAB resin, and wax emulsion to 45 parts of ethanol in sequence while stirring (the stirring paddle linear speed is 15 m / min) to obtain a mixture;

[0042] S2, stirring the mixture (the linear speed of the stirring paddle is 35 m / min) until it is dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging, and obtaining the product.

[0043] Wherein comparative example 1, a method for preparing varnish, comprises the following steps:

[0044] S1, adding PVB resin, aldehyde-ketone resin, CAB resin and wax emulsion to 45 parts of ethanol in sequence while stirring (the stirring paddle linear speed is 15 m / min) to obtain a mixture;

[0045] S2, stirring the mixture (the linear speed of the stirring paddle is 35 m / min) until it is dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging, and obtaining the product.

[0046] Wherein comparative example 2, a method for preparing varnish, comprises the following steps:

[0047] S1, adding PVB resin, aldehyde-ketone resin, rosin resin and wax emulsion to 45 parts of ethanol in sequence while stirring (the stirring paddle linear speed is 15 m / min) to obtain a mixture;

[0048] S2, stirring the mixture (the linear speed of the stirring paddle is 35 m / min) until it is dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging, and obtaining the product.

[0049] Comparative Example 3, a method for preparing varnish, comprises the following steps:

[0050] S1, adding PVB resin, aldehyde-ketone resin, rosin resin, and CAB resin to 45 parts of ethanol in sequence while stirring (the stirring blade linear speed is 15 m / min) to obtain a mixture;

[0051] S2, stirring the mixture (the linear speed of the stirring paddle is 35 m / min) until it is dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging, and obtaining the product.

[0052] Performance Testing Methods

[0053] The varnish prepared in the examples and comparative examples was formulated into ink (Table 3) for performance testing. The test data are listed in Table 4.

[0054] Table 2

[0055] Common color ink test formula (weight parts) Metallic ink test formula (parts by weight) Varnish 10 10 Iron yellow paste 2.5 / Iron yellow paste 2 / Black pulp 0.5 / Silver paste / 2.5 Ethanol 15 15

[0056] 1. Wear resistance: rub back and forth 100 times with a gravity of 1kg and observe the powder loss;

[0057] 2. Temperature resistance: At 120℃ ambient temperature, press with 1kg weight for 10min and observe the adhesion;

[0058] 3. Surface printing effect (visual inspection): Observe whether the surface is flat and smooth and the pattern is clear;

[0059] 4. Adhesion performance: (visual inspection): Observe whether there is ink accumulation on the guide roller of the printing press.

[0060] Performance test data

[0061] Table 4

[0062]

[0063]

Claims

1. A varnish, It is characterized in that Components include: PVB resin, aldehyde-ketone resin, rosin resin, CAB resin, wax emulsion, defoamer, leveling agent and ethanol.

2. The varnish according to claim 1, It is characterized in that The components include, by weight: 10-30 parts of PVB resin, 3-15 parts of aldehyde-ketone resin, 1-8 parts of rosin resin, 1-5 parts of CAB resin, 0.5-5 parts of wax emulsion, 0.5-2 parts of defoaming agent, 0.5-2 parts of leveling agent and 50-100 parts of ethanol.

3. The varnish according to claim 2, It is characterized in that The viscosity of the PVB resin at 20° C. is 3-15 seconds.

4. The varnish according to claim 3, It is characterized in that The aldehyde-ketone resin has a softening point of 80-120° C. and a hydroxyl value of 25-55 mgKOH / g.

5. The varnish according to claim 1 or 4, It is characterized in that The weight ratio of the PVB resin to the aldehyde-ketone resin is (1.5-4):

1.

6. The varnish according to claim 5, It is characterized in that The weight ratio of the rosin resin, CAB resin and wax emulsion is (1.5-2.5):1:(0.5-3).

7. The varnish according to any one of claims 1 to 3, It is characterized in that The rosin resin includes rosin-modified maleic acid resin.

8. A method for preparing the varnish according to any one of claims 1 to 3, It is characterized in that The following steps are involved: S1, adding PVB resin, aldehyde-ketone resin, rosin resin, CAB resin, and wax emulsion to part of ethanol in sequence while stirring to obtain a mixture; S2, stirring the mixture until dissolved, adding the remaining ethanol, defoaming agent and leveling agent, filtering and packaging to obtain.

9. The method for preparing varnish according to claim 8, It is characterized in that The part of ethanol accounts for 60-80% of the total amount of ethanol.

10. A use of the varnish according to any one of claims 1 to 3, It is characterized in that Used in tipping paper ink.

Images