CN116135933B - Water-based screen printing ink and preparation method thereof - Google Patents
Water-based screen printing ink and preparation method thereof Download PDFInfo
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- CN116135933B CN116135933B CN202310341973.0A CN202310341973A CN116135933B CN 116135933 B CN116135933 B CN 116135933B CN 202310341973 A CN202310341973 A CN 202310341973A CN 116135933 B CN116135933 B CN 116135933B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000007650 screen-printing Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 59
- 239000006185 dispersion Substances 0.000 claims abstract description 29
- 239000012948 isocyanate Substances 0.000 claims abstract description 29
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 29
- 239000004606 Fillers/Extenders Substances 0.000 claims abstract description 26
- 230000004913 activation Effects 0.000 claims abstract description 26
- 239000003906 humectant Substances 0.000 claims abstract description 25
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920003009 polyurethane dispersion Polymers 0.000 claims abstract description 21
- 239000002562 thickening agent Substances 0.000 claims abstract description 17
- 230000008033 biological extinction Effects 0.000 claims abstract description 15
- 239000006184 cosolvent Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000000080 wetting agent Substances 0.000 claims abstract description 13
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 28
- 229920002635 polyurethane Polymers 0.000 claims description 15
- 239000004814 polyurethane Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical group CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical compound CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 claims description 4
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 claims description 4
- 239000012972 dimethylethanolamine Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical group CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 29
- 238000007639 printing Methods 0.000 abstract description 27
- 239000000463 material Substances 0.000 abstract description 14
- 239000011347 resin Substances 0.000 abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 13
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 4
- 238000004132 cross linking Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000976 ink Substances 0.000 description 43
- 230000000052 comparative effect Effects 0.000 description 42
- 239000010408 film Substances 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920002313 fluoropolymer Polymers 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229920001780 ECTFE Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- -1 ethylene-chlorotrifluoroethylene Chemical group 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/023—Emulsion inks
- C09D11/0235—Duplicating inks, e.g. for stencil printing
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention discloses water-based screen printing ink and a preparation method thereof, wherein the ink comprises a main agent and a curing agent; wherein, the main agent comprises: the preparation method comprises the following steps of (1) aqueous polyurethane dispersion, talcum powder, aqueous black paste, aqueous cosolvent, activation period extender, wetting agent, thickener, extinction powder and neutralizer; the curing agent comprises: aqueous isocyanate and propylene glycol methyl ether acetate. In the invention, the aqueous polyurethane dispersion with high tensile strength and high elongation at break is used as the main film forming resin to provide a main film forming material with high strength for a coating film; the activation period extender containing special groups is used, so that the uniform dispersion of the water-based isocyanate is facilitated, the construction activation period of the water-based ink system is prolonged, and the problem that the application period of the high-temperature weather ink is shortened is solved; the water-based isocyanate curing agent is used for reacting with hydroxyl, carboxyl and other groups in the resin, so that the crosslinking strength of the resin is further improved, and the moisture is absorbed and kept by using the humectant, so that the stable printing effect of the resin is ensured.
Description
Technical Field
The invention belongs to the technical field of water-based printing ink, and particularly relates to water-based screen printing ink and a preparation method thereof.
Background
The main film forming material of the water-based screen printing ink is water-based polyurethane dispersoid, and the water-based ink is ink formed by dissolving polyurethane in water or dispersing the polyurethane in the water. The aqueous polyurethane can be classified into three types according to the form and particle size thereof, namely, an aqueous polyurethane solution (particle size < 0.001 μm, appearance transparent), a polyurethane dispersion (particle size 0.001 to 0.1 μm, appearance transparent), and a polyurethane emulsion (particle size > 0.1 μm, appearance cloudy), and in practical applications, aqueous polyurethane is mainly used as a polyurethane emulsion or a polyurethane dispersion. The aqueous polyurethane coating film has the characteristics of high wear resistance, high elasticity and strong adhesive force, and the physical and chemical properties of the aqueous screen printing ink prepared from the resin are stronger than those of the traditional aqueous resin. However, the existing water-based screen printing ink has short construction activation period and poor physical and mechanical properties.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide water-based screen printing ink and a preparation method thereof.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
an aqueous screen printing ink comprises a main agent and a curing agent;
the main agent comprises the following components in parts by weight:
50-60 parts of aqueous polyurethane dispersoid
10 to 20 parts of talcum powder
10-20 parts of water-based black paste
5-10 parts of aqueous cosolvent
1 to 2 parts of activation period extender
1 to 2 parts of humectant
1-2 parts of wetting agent
1-2 parts of thickening agent
1-2 parts of extinction powder
0.5 to 1 portion of neutralizer;
the curing agent comprises the following components in parts by weight:
70-80 parts of water-based isocyanate
20-30 parts of propylene glycol methyl ether acetate.
Further, the aqueous polyurethane dispersion is selected from aqueous polyurethane dispersion with high tensile strength and high elongation at break, and is Witcobond 281F or Witcobond 781 with model number of Lang Cheng Huaxue.
Furthermore, the activation period extender adopts DYR-9213 of Ding material science and technology (Shanghai) Co., ltd, and is a nonionic fluorocarbon polymer containing special groups, wherein the special groups are groups capable of carrying out reversible reaction with NCO groups in aqueous isocyanate.
Furthermore, the water-based isocyanate adopts water-dispersible isocyanate, and the NCO group content in the water-based isocyanate is 22-23%.
Further, the humectant adopts PEG-200; the aqueous black paste is M-100 of Zhejiang Namei.
Further, the wetting agent adopts one or a combination of several of high TEGO Twin 4100, SURFYNOL 104E, TEGO Wet270 and TEGO Wet 240.
Further, the aqueous cosolvent is diethylene glycol butyl ether; the talcum powder is superfine talcum powder of 10000-12500 meshes.
Further, the neutralizer is DMEA; the thickener is polyurethane association type thickener.
The invention also discloses a preparation method of the water-based screen printing ink, which comprises the following steps:
preparing a main agent:
a, adding a formula amount of aqueous polyurethane dispersion into a paint mixing container;
b, slowly adding the water-based cosolvent and the wetting agent in the formula amount under stirring;
c, slowly adding talcum powder, extinction powder and aqueous black paste in the formula amount under stirring;
d, slowly adding a formula amount of neutralizer under stirring, and adjusting the pH value of the tray to 8-9;
e, slowly adding the thickener with the formula amount under stirring, and adjusting the viscosity value to 100-110 KU;
f, slowly adding a formula amount of humectant and an activation period extender under stirring;
preparing a curing agent:
adding propylene glycol methyl ether acetate with a formula amount into a dry and clean dispersing container;
and B, adding the aqueous isocyanate in the formula amount under stirring, stirring until the mixture is uniform, and filtering.
Further, the dispersion speed in the step a and the step b is 400-600 r/min, and the dispersion time is 10-15 min;
in the step c, the talcum powder, the extinction powder and the aqueous black paste are added and then dispersed for 20-30 min at a dispersion speed of 1800-2000 r/min;
the dispersion speeds in the steps d, e and f are 800-1000 r/min, and the dispersion time is 10-15 min;
the dispersion speed in the step A, B is 200-400 r/min, and the dispersion time is 5-10 min.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses water-based screen printing ink and a preparation method thereof, wherein a water-based polyurethane dispersoid with high tensile strength and high elongation at break is used as a main film forming resin, a main film forming material with high strength is provided for a coating film, an aqueous isocyanate curing agent is used for reacting with hydroxyl, carboxyl and other groups in the resin, the crosslinking strength of the water-based screen printing ink is further improved, moisture is absorbed and kept by a humectant, and the stable printing effect of the water-based screen printing ink is ensured; the activation period extender is used to prolong the use activation period, greatly increase the use time and reduce the waste; the water-based screen printing ink disclosed by the invention has excellent physical properties such as tensile strength, elongation at break and the like, has a longer construction activation period and an excellent printing effect, completely meets the current market water-based requirement, and is more suitable for industrial popularization and use.
Drawings
FIG. 1 is a graph showing the printing result of example 1 of the present invention;
FIG. 2 is a graph showing the printing results of example 1 and comparative example 1 of the present invention;
FIG. 3 is a graph showing the printing results of example 1 and comparative example 2 of the present invention;
FIG. 4 is a graph showing the printing results of example 1 and comparative example 3 of the present invention.
Detailed Description
The present invention is described in detail below so that advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and unambiguous the scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As shown in fig. 1 to 4, an aqueous screen printing ink includes a main agent and a curing agent; the main agent comprises the following components in parts by weight:
50-60 parts of aqueous polyurethane dispersoid
10 to 20 parts of talcum powder
10-20 parts of water-based black paste
5-10 parts of aqueous cosolvent
1 to 2 parts of activation period extender
1 to 2 parts of humectant
1-2 parts of wetting agent
1-2 parts of thickening agent
1-2 parts of extinction powder
0.5 to 1 portion of neutralizer;
the curing agent comprises the following components in parts by weight:
70-80 parts of water-based isocyanate
20-30 parts of propylene glycol methyl ether acetate.
The aqueous polyurethane dispersion is selected from aqueous polyurethane dispersion with high tensile strength and high elongation at break, and is Witcobond 281F or Witcobond 781 of model number Lang Cheng Huaxue. The aqueous polyurethane dispersion is the main film forming resin in the ink system, provides a high-strength main film forming matter for the coating film, and the physical properties of the coating film are mainly determined by the properties of the film forming resin.
The activation period extender adopts DYR-9213 of Ding material science and technology (Shanghai) limited company, which is a nonionic fluorocarbon polymer containing special groups, wherein the special groups are groups capable of carrying out reversible reaction with NCO groups in aqueous isocyanate. The special activation period extender is added, so that the water-based isocyanate is uniformly dispersed in the system, is preferentially combined with NCO groups in the water-based isocyanate, releases the NCO groups along with volatilization of moisture, reacts with hydroxyl groups, carboxyl groups and other groups in resin, improves the construction activation period of the water-based ink system to a certain extent, does not cause reduction of hardness and chemical resistance caused by incomplete curing of a coating, and effectively solves the problem of shortening the pot life of the water-based ink system in high temperature weather.
The aqueous isocyanate adopts hexamethylene diisocyanate-based water-dispersible isocyanate, preferably adopts aquaolin 278 of Van der Waals chemistry, which is an HDI type water-dispersible isocyanate curing agent with the NCO group content of 22-23 percent (preferably 22.5 percent) and has extinction effect, and the water-dispersible isocyanate curing agent mainly has crosslinking reaction with hydroxyl groups and carboxyl groups in resin, water, aqueous cosolvent, hydroxyl groups and amino groups in neutralizer and the like.
The humectant preferably adopts PEG-200, and the water-based ink keeps certain fluidity through the water retention and absorption, so that the water-based ink can continuously and stably print.
The talcum powder is 10000-12500 mesh superfine talcum powder, preferably Shenzhen combined with Xin LNX-222B, has good suspension property and easy dispersibility, can play a role of a skeleton when being used as a filler in water-based ink, reduces manufacturing cost, improves paint film hardness of a coating film, and also has the effects of improving stability of product shape, tensile strength, shearing strength and pressure strength, and reducing deformation, elongation and thermal expansion coefficient.
The matting agent preferably adopts E-1011 of Tosoh, japan, and causes the expected roughness of the surface of the coating, and a part of refraction and diffuse reflection occur, so as to reduce the gloss of the surface of the coating.
The water-based black paste is preferably M-100 of Zhejiang Namei and high-pigment nano-scale water-based black paste. The aqueous black paste is an aqueous preparation of carbon black pigment, contains a high molecular surfactant and a dispersing agent, and provides color development and coverage in an aqueous ink system.
The aqueous cosolvent adopts diethylene glycol butyl ether, so that the viscosity of the whole aqueous ink system can be reduced, the wettability to pigment and filler is provided, the dispersing effect is improved, and meanwhile, the aqueous cosolvent is an excellent film forming auxiliary agent, the minimum film forming temperature is reduced, and the film forming property of a coating film is better.
The neutralizing agent is selected from DMEA, N, N-dimethylethanolamine, and is used for regulating the pH value of the water-based ink system to ensure that the pH value is stabilized at 8-9, so that the storage stability in the later period can be improved, and sedimentation and layering are not easy.
The thickening agent is polyurethane associative thickener, is a rheological additive, and can improve the viscosity of the ink under the action of proper shearing force, so as to prevent the diffusion phenomenon in the construction process.
The wetting agent adopts one or a combination of a plurality of high TEGO Twin 4100, SURFYNOL 104E, TEGO Wet270 and TEGO Wet 240, which is favorable for reducing the surface tension of the water-based ink, reducing the sensitivity of the ink to the pollutants of the base material, enabling the ink to spread on the base material better and increasing the fullness of the printing effect.
A method for preparing water-based screen printing ink, comprising the following steps:
preparing a main agent:
a, adding a formula amount of aqueous polyurethane dispersion into a paint mixing container;
b, slowly adding the water-based cosolvent and the wetting agent in the formula amount under stirring;
c, slowly adding talcum powder, extinction powder and aqueous black paste in the formula amount under stirring;
d, slowly adding a formula amount of neutralizer under stirring, and adjusting the pH value of the tray to 8-9;
e, slowly adding a formula amount of thickener under stirring, adjusting the viscosity value to 100-110 KU, and testing by a stormer viscometer to obtain the product;
f, slowly adding a formula amount of humectant and an activation period extender under stirring;
preparing a curing agent:
adding propylene glycol methyl ether acetate with a formula amount into a dry and clean dispersing container;
and B, adding the aqueous isocyanate in the formula amount under stirring, stirring until the mixture is uniform, and filtering.
The dispersion speed in the step a and the step b is 400-600 r/min, and the dispersion time is 10-15 min;
in the step c, the talcum powder, the extinction powder and the aqueous black paste are added and then dispersed for 20-30 min at a dispersion speed of 1800-2000 r/min;
the dispersion speeds in the steps d, e and f are 800-1000 r/min, and the dispersion time is 10-15 min;
the dispersion speed in the step A, B is 200-400 r/min, and the dispersion time is 5-10 min.
An application method of water-based screen printing ink comprises the following steps:
and uniformly mixing the main agent and the curing agent according to a certain weight ratio, and then printing.
Example 1
An aqueous screen printing ink comprises a main agent and a curing agent; the main agent comprises the following components in parts by weight:
55 parts of aqueous polyurethane dispersion
15 parts of talcum powder
15 parts of water-based black paste
7 parts of aqueous cosolvent
1 part of activation period extender
Wetting agent 1.5 parts
Thickener 1 part
Matting powder 2 parts
Humectant 2 parts
0.5 part of neutralizer;
the curing agent comprises the following components in parts by weight:
75 parts of aqueous isocyanate
25 parts of propylene glycol methyl ether acetate.
The aqueous polyurethane dispersion is prepared from aqueous polyurethane dispersion with high tensile strength and high elongation at break, and is Witcobond 781 with model number of Lang Cheng Huaxue.
The activation period extender adopts DYR-9213 of Ding material science and technology (Shanghai) limited company, and is a nonionic fluorocarbon polymer containing special groups, wherein the special groups are groups capable of carrying out reversible reaction with NCO groups in aqueous isocyanate.
The water-based isocyanate adopts aquaolin 278 of Wanhua chemistry, and is an HDI type water-dispersible isocyanate curing agent with extinction effect and NCO group content of 22.5%.
The humectant adopts PEG-200.
The talcum powder adopts Shenzhen combined Xin LNX-222B with 10000 meshes.
The matting powder is E-1011 of Tosoh Japan.
The water-based black paste adopts M-100 of Zhejiang Namei.
The aqueous cosolvent is DB of Dow chemical.
The neutralizing agent is DMEA of Isman.
The thickener is Borchi-0620 polyurethane associative thickener of Borchi-Xie Sai.
The wetting agent was 0.5 parts each of a mixture of Digao TEGO Tain 4100, SURFYNOL 104E, TEGO Wet 270.
A method for preparing water-based screen printing ink, comprising the following steps:
preparing a main agent:
a, adding a formula amount of aqueous polyurethane dispersion into a paint mixing container;
b, slowly adding the water-based cosolvent and the wetting agent in the formula amount under stirring;
c, slowly adding talcum powder, extinction powder and aqueous black paste in the formula amount under stirring;
d, slowly adding a formula amount of neutralizer under stirring, and adjusting the pH value of the tray to 8.8;
e, slowly adding the thickener with the formula amount under stirring, adjusting the viscosity value to 110KU, and testing by a stormer viscometer to obtain the product;
f, slowly adding a formula amount of humectant and an activation period extender under stirring;
preparing a curing agent:
adding propylene glycol methyl ether acetate with a formula amount into a dry and clean dispersing container;
adding the water-based isocyanate with the formula amount under stirring, stirring until the mixture is uniform, and filtering;
subsequently, the main agent and the curing agent were mixed uniformly in a weight ratio of 100:8, and 300 mesh screen printing was used.
The dispersion speed in the step a and the step b is 500r/min, and the dispersion time is 10min;
in the step c, the talcum powder, the extinction powder and the aqueous black paste are added and then dispersed for 20min at a dispersion speed of 1800 r/min;
the dispersion speeds in the steps d, e and f are all 1000r/min, and the dispersion time is all 10min;
the dispersion speed in the step A, B was 300r/min and the dispersion time was 10min.
An application method of water-based screen printing ink comprises the following steps:
and uniformly mixing the main agent and the curing agent according to the weight ratio of 100:8 for 2 hours, and then printing.
Comparative example 1
The difference between this comparative example and example 1 is that this comparative example does not contain a humectant.
Example 1 was followed.
Comparative example 2
The difference between this comparative example and example 1 is that this comparative example does not contain an activation period extender.
Example 1 was followed.
Comparative example 3
The difference between this comparative example and example 1 is that this comparative example replaces Witcobond 781 of Lang Cheng Huaxue with an equivalent amount of aqueous polyurethane dispersion Witcobond 240 having a tensile strength of 40MPa and an elongation at break of 70%.
Example 1 was followed.
Comparative example 4
The difference between this comparative example and example 1 is that this comparative example reduces the amount of humectant to 2 parts to 0.5 parts.
Example 1 was followed.
Comparative example 5
The difference between this comparative example and example 1 is that this comparative example reduces 1 part of the pot life extender to 0.5 part.
Example 1 was followed.
Comparative example 6
The difference between this comparative example and example 1 is that this comparative example replaces DYR-9213 of the ancient material science and technology (Shanghai) limited with ethylene-chlorotrifluoroethylene copolymer.
Example 1 was followed.
Comparative example 7
The difference between this comparative example and example 1 is that this comparative example replaces DYR-9213 of the ancient cooking materials science and technology (Shanghai) limited with a nonionic fluoroalkyl acrylate copolymer.
Example 1 was followed.
The main agent and the curing agent of the ink obtained in example 1 were mixed at a weight ratio of 100:8 for 2 hours, and after printing, physical properties were measured, and the results are shown in table 1.
TABLE 1
As can be seen from table 1, the aqueous screen printing ink for thin film materials prepared from the aqueous polyurethane dispersion with high tensile strength and high elongation at break in example 1 has very good flexibility and excellent rubbing resistance, meets the mechanical properties of rubber friction resistance, meets the chemical resistance of alcohol resistance, and simultaneously has excellent adhesive force.
The inks obtained in example 1 and comparative examples 1-2 were printed with the printing effects shown in FIGS. 2-3. The results of fig. 2 show that the printed pattern of example 1 is complete and full, while the printed pattern of comparative example 1 has non-uniform agglomeration in the middle, and many pits, indicating that the printing effect is significantly deteriorated after the main agent is mixed with the curing agent for 2 hours without adding the humectant. The results of fig. 3 show that the pattern printed in example 1 is normal, the pattern printed in comparative example 2 is very poor, and the effect of the pattern printed in comparative example 2 shows that the main agent and the curing agent are substantially completely reacted after being mixed for 2 hours without adding the activation period extender, and the aqueous ink is substantially unusable. As is clear from comparison of comparative example 1 and comparative example 2, the effect of the printing effect was the worst without adding the humectant and the effect of the printing effect inferior to that without adding the humectant, which means that the effect of the printing effect of the humectant was greater than that of the humectant, and the printing effect could be improved only by compounding the active period extender with the humectant (see example 1).
The rub resistance test of example 1 was conducted with respect to comparative example 3, and the test results are shown in FIG. 4, and the results show that, in comparative example 3, the properties concerning the flexibility such as rub resistance and the like are significantly lower than those of example 1 because of using the aqueous polyurethane dispersion Witcobond 240 having a tensile strength of 40MPa and an elongation at break of 70%.
As is clear from comparison of example 1 with comparative example 4, comparative example 4 reduced the amount of humectant to 0.5 part, and after the main agent and the curing agent were mixed in the same ratio for 2 hours, the printed pattern was slightly agglomerated, which indicates that the amount of humectant had an effect on the printing effect as compared with the printing effect of example 1.
As is clear from the comparison between example 1 and comparative example 5, the results show that the yield of the printed product is reduced because the printed pattern has partial defects and NCO groups in the curing agent are released and participate in the reaction in comparative example 5 due to the reduction of the amount of the active phase extender after the main agent and the curing agent are mixed for 2 hours according to the same proportion, and the yield of the mass production of the product in example 1 with the use of the active phase within 2 hours is stable, which indicates that the amount of the active phase extender has an influence on the printing effect. The results of comparative examples 1 to 2 are combined, and it is found that the printing effect can be improved only by compounding the activation period extender with the humectant, and that proper compounding is required, and that the selection of the amount is one of the keys for improving the printing effect.
As can be seen from comparing example 1 with comparative example 6, the result shows that the DYR-9213 is replaced by ethylene-chlorotrifluoroethylene copolymer fluorocarbon resin in comparative example 6, the pattern printing effect is very poor, the type of the activation period extender has obvious influence on the printing effect, the curing agent has basically completely reacted after 2 hours of mixing the main agent with the curing agent, the water-based ink is basically unusable, and the problem of short applicable period of the ink can be solved only by using DYR-9213 of Ding Material science and technology (Shanghai).
As can be seen from comparing example 1 with comparative example 7, the result shows that the DYR-9213 is replaced by nonionic fluoroalkyl acrylate copolymer in comparative example 7, the pattern printing effect is very poor, the type of the activation period extender has obvious influence on the printing effect, the curing agent is basically completely reacted after 2 hours of mixing with the main agent, the water-based ink is basically unusable, and the problem of short applicable period of the ink can be solved only by using DYR-9213 of Ding Material science and technology (Shanghai) Co.
In fact, the present invention has been largely tested against the present fluorocarbon polymers, not limited to the pot life extender of comparative examples 6-7, but the results show that only DYR-9213 of Ding-material technology (Shanghai) limited can solve the problem of short pot life of the ink.
Parts or structures of the present invention, which are not specifically described, may be existing technologies or existing products, and are not described herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (7)
1. An aqueous screen printing ink is characterized by comprising a main agent and a curing agent;
the main agent comprises the following components in parts by weight:
50-60 parts of aqueous polyurethane dispersion
10-20 parts of talcum powder
10-20 parts of water-based black paste
5-10 parts of aqueous cosolvent
1-2 parts of activation period extender
1-2 parts of humectant
1-2 parts of wetting agent
1-2 parts of thickener
1-2 parts of extinction powder
0.5-1 part of neutralizing agent;
the curing agent comprises the following components in parts by weight:
70-80 parts of water-based isocyanate
20-30 parts of propylene glycol methyl ether acetate;
the model of the aqueous polyurethane dispersion is Witcobond 281F or Witcobond 781 of Lang Cheng Huaxue;
the model of the activation period extender is DYR-9213;
the aqueous isocyanate adopts water-dispersible isocyanate, and the NCO group content in the aqueous isocyanate is 22-23%.
2. The aqueous screen printing ink according to claim 1, wherein the humectant is PEG-200; the aqueous black paste is M-100 of Zhejiang Namei.
3. The aqueous screen printing ink of claim 1, wherein the wetting agent is one or a combination of several of TEGO Twin 4100, SURFYNOL 104E, TEGO Wet270, TEGO Wet 240.
4. The water-based screen printing ink according to claim 1, wherein the water-based cosolvent is diethylene glycol butyl ether; the talcum powder is 10000-12500 mesh superfine talcum powder.
5. The water-based screen printing ink according to claim 1, wherein the neutralizing agent is DMEA; the thickener is polyurethane association type thickener.
6. The method for preparing an aqueous screen printing ink according to any one of claims 1 to 5, comprising the steps of:
preparing a main agent:
a, adding a formula amount of aqueous polyurethane dispersion into a paint mixing container;
b, slowly adding the water-based cosolvent and the wetting agent in the formula amount under stirring;
c, slowly adding talcum powder, extinction powder and aqueous black paste in the formula amount under stirring;
d, slowly adding a formula amount of neutralizer under stirring, and adjusting the pH value to 8-9;
e, slowly adding a formula amount of thickener under stirring, and adjusting the viscosity value to 100-110 KU;
f, slowly adding a formula amount of humectant and an activation period extender under stirring;
preparing a curing agent:
adding propylene glycol methyl ether acetate with a formula amount into a dry and clean dispersing container;
and B, adding the aqueous isocyanate in the formula amount under stirring, stirring until the mixture is uniform, and filtering.
7. The preparation method of the water-based screen printing ink according to claim 6, wherein the dispersion speed in the step a and the step b is 400-600 r/min, and the dispersion time is 10-15 min;
in the step c, after the talcum powder, the extinction powder and the aqueous black paste are added, the talcum powder, the extinction powder and the aqueous black paste are dispersed for 20-30 min at a dispersion speed of 1800-2000 r/min;
the dispersion speeds in the steps d, e and f are 800-1000 r/min, and the dispersion time is 10-15 min;
the dispersion speed in the step A, B is 200-400 r/min, and the dispersion time is 5-10 min.
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