Method for preparing polyurethane binder for flexible printing composite ink

A technology of polyurethane adhesive and polyurethane resin, which is applied in ink, application, and home appliances, etc., can solve the problems of easy release of formaldehyde, thermal sticking and freezing of polyamide ink, etc., achieve large cohesive energy of urea bonds, meet the requirements of use, The effect of good adhesion fastness

Inactive Publication Date: 2015-05-06
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of polyurethane adhesive for flexo printing composite ink, which can meet the performance requirements of flexographic ink used in food packaging, and solve the problem that the existing polyvinyl butyral ink is easy to release Formaldehyde, polyamide ink hot sticky freezing problem

Method used

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  • Method for preparing polyurethane binder for flexible printing composite ink
  • Method for preparing polyurethane binder for flexible printing composite ink
  • Method for preparing polyurethane binder for flexible printing composite ink

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preparation example Construction

[0023] The embodiment of the present invention provides a method for preparing an adhesive for flexographic composite ink, which is a method for preparing an alcohol-soluble polyurethane resin adhesive. The method includes the following steps:

[0024] Preparation of NCO-terminated prepolymers:

[0025] After mixing 71-84 parts by mass of polyether diol, 0.05-0.2 parts by mass of catalyst, and 16-29 parts by mass of diisocyanate, and reacting at 50-120°C for 2-4 hours, the obtained reaction product is NCO-terminated prepolymer, the structure of the NCO-terminated prepolymer is: OCN-B-(-NH-CO-O-R1-O-CO-NH-)m-B-NCO; wherein, R1 is methylene group, ether group, cyclohexyl or aromatic hydrocarbon group, B is methylene, aromatic hydrocarbon group or alicyclic hydrocarbon group;

[0026] Chain extension synthesis:

[0027] Prepare another container (such as a flask or a reaction kettle), add 0.7-1.4 parts by mass of amine chain extender, 67-73 parts by mass of alcohol solvent, and...

Embodiment 1

[0038] This embodiment provides a method for preparing polyurethane resin for alcohol-soluble flexographic composite ink, which specifically includes the following steps:

[0039] (1) Preparation of terminal NCO-based prepolymers:

[0040] raw material

[0041] After mixing 72 parts by mass of polyether diol, 0.05 parts by mass of catalyst, and 28 parts by mass of MDI, react at 80°C for 3 hours to obtain a prepolymer with an NCO of 6.4;

[0042] (2) chain extension synthesis:

[0043] raw material

[0044] In addition, prepare a flask, add 1.3 parts by mass of ethylenediamine, 70 parts by mass of isopropanol, stir evenly, and drop the prepolymer prepared in 28.7 parts by mass (1) into the above-mentioned mixed solution for 5 minutes to carry out the chain extension reaction. The temperature is controlled below 30°C, and the polyurethane resin is obtained after 2.5 hours of reaction, with a viscosity of 3000mpa.s and a solid content of 31.0%;

Embodiment 2

[0046] This embodiment provides a method for preparing polyurethane resin for alcohol-soluble flexographic composite ink, which specifically includes the following steps:

[0047] (1) Preparation of terminal NCO-based prepolymers:

[0048] (2)

[0049]

[0050] Mix 84 parts by mass of PPG2000, 0.1 parts by mass of catalyst, and 16 parts by mass of TDI, and react at 80°C for 2 hours to obtain a prepolymer with an NCO value of 4.2;

[0051] (2) chain extension synthesis:

[0052] raw material

[0053] Prepare another flask, add 1.4 parts by mass of 1,6 hexamethylenediamine and 70 parts by mass of ethanol, stir evenly, put 28.6 parts by mass of the prepolymer prepared in (1) into the above mixed solution within 30 minutes for chain extension reaction , the reaction temperature is controlled below 40°C, the polyurethane resin is obtained after 2 hours of reaction, the viscosity is 1500mpa.s, and the solid content is 30.2%;

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Abstract

The invention discloses a method for preparing a polyurethane binder for flexible printing composite ink. The method comprises the following steps: preparing a terminal-NCO group prepolymer, namely, mixing polyether glycol, a catalyst and diisocyanate, reacting for 2-4 hours at 50-120 DEG C to obtain a reaction product, namely, the terminal-NCO group prepolymer; and carrying out chain extension synthesis, namely, adding an amine chain extender and an alcohol solvent into an another container to form a mixed solution, feeding the prepared terminal-NCO group prepolymer to the mixed solution within 5-50 minutes and carrying out chain extension reaction for 2-3 hours to obtain polyurethane resin, namely, polyurethane binder for flexible printing composite ink, wherein the reaction temperature is controlled at 30-50 DEG C. The prepared resin has the advantages of good solubleness in alcohol, high cohesive energy, excellent dryness and adhesion force, high composite strength, excellent printability, no foreign smell, no residue, safety and environmental friendliness after printing.

Description

technical field [0001] The invention relates to an adhesive for flexographic printing inks, in particular to a polyurethane adhesive for flexographic composite inks which has excellent adhesion fastness to plastic films, composite strength, color development and can be completely dissolved in alcohol solvents method of preparation. Background technique [0002] At present, flexo printing inks are widely used in food packaging, pharmaceutical packaging, tobacco packaging and other fields. Due to the high quality of flexo printing and excellent environmental performance, the market share continues to rise, especially the application of high value-added technologies such as radio frequency tags and anti-counterfeiting printing. , Small batches, diversified printed products are gradually increasing, and the number of packages is increasing, and the advantages of flexographic printing are increasingly reflected. [0003] The flexographic composite ink used in traditional food pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/10C08G18/32C09D11/102
CPCC08G18/10C08G18/3228C08G18/3234C08G18/4825C08G18/4833C08G18/6685C09D11/102
Inventor 王登科赫长生
Owner BEIJING COMENS NEW MATERIALS
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