Waterborne polyurethane printing ink resin and production method thereof

Abstract

The invention relates to waterborne polyurethane printing ink resin and a production method thereof. The production method of the waterborne polyurethane printing ink resin comprises the steps of according to weight parts, under a condition of protection of inert gas, taking 100-140 parts of cyclic isocyanate, 95-160 parts of polypropylene oxide glycol with a molecular weight of 2000, 40-70 partsof homemade polyester polyol with a molecular weight of 200-400 and 20-35 parts of hydrophilic groups, and placing the raw materials in a container; stirring a solution in the container, slowly elevating temperature, when the temperature reaches 80 DEG C, carrying out a heat preservation reaction for 5 hours, conducting sampling, detecting a NCO value, and when the NCO value is in a prescribed range, starting to conduct cooling to obtain a NCO-terminated prepolymer; and adding 10-20 parts of ethylenediamine and 600-650 parts of deionized water into the prepolymer, when the temperature is 30 DEG C, conducting high-speed stirring for two hours, conducting sampling, detecting the NCO value, when the NCO value is zero, conducting high-speed stirring continuously for 2 hours, and standing to obtain the waterborne polyurethane resin. According to the waterborne polyurethane printing ink resin and the production method thereof, waterborne polyurethane is produced by adopting an anion self-emulsifying technology, the tenacity and the rigidity of the anionic waterborne polyurethane are good, and the anionic waterborne polyurethane has good dispersity, water resistance and stability so thatthe waterborne polyurethane can conveniently form a film.

Description

technical field

[0001] The invention relates to the technical field of polyurethane, in particular to a water-based polyurethane ink resin and a preparation method thereof. Background technique

[0002] Ink is an important material for printing. It expresses patterns and characters on the substrate through printing. Ink is generally composed of pigments, binders, solvents and additives, etc. These components are evenly mixed and rolled repeatedly to form a viscous colloidal fluid. Ink is widely used in various printings such as books, periodicals, packaging and decoration, and architectural decoration; as social demand increases, ink varieties and output also expand and increase accordingly. The binder of the ink is usually water-based polyurethane, which is widely used for its excellent properties such as high and low temperature resistance, embrittlement resistance, friction resistance, strong adhesion, good flexibility, good elasticity and high tensile strength. [0003...

Examples

Embodiment 1

[0035] Preparation of polyester polyol

[0036]Because the present invention adopts prepolymer method to synthesize and prepare waterborne polyurethane, therefore, there are strict requirements for the molecular weight of linear polyester polyol, the molecular weight of polyester polyol is limited between 100-500, and the molecular weight of polyester polyol is between 100-500. It is better between 200-400. Polyester polyols need to be synthesized. In order to control the molecular weight of polyester polyols, therefore, diols in polyester polyols should be dibasic alcohols with small molecules, and dibasic acids in polyester polyols should be dibasic acids with small molecules. The dibasic alcohol in the polyester polyol can be made by one or more in ethylene glycol, propylene glycol, butanediol, neopentyl glycol and hexylene glycol, and the dibasic acid in the polyester polyol can be made from ethylene glycol One or more of diacid, malonic acid, glutaric acid and adipic aci...

Embodiment 2

[0041] The difference between embodiment 2 and embodiment 1 is:

[0042] Preparation of waterborne polyurethane

[0043] In parts by weight, under the condition of nitrogen protection, 100 parts of isophorone diisocyanate, 110 parts of polyoxypropylene diol with a molecular weight of 2000, and 60 parts of polyester polyol with a molecular weight of 200-400 are successively added to the container , 23 parts of sodium 1,2-dihydroxy-3-propanesulfonate, use a stirring device to stir the solution in the container, and heat it slowly. When the temperature reaches 80°C, keep the temperature in the container at 80°C, so that the solution in the container After reacting the solution for five hours, take the sample liquid in the container to detect the NCO value. When the NCO is 4-4.3%, stop maintaining the temperature in the container, so that the temperature in the container is lowered, so as to obtain the NCO-capped preform for future use.

[0044] Add 15 parts of ethylenediamine an...

Embodiment 3

[0046] The difference between embodiment 3 and embodiment 1 is:

[0047] Preparation of waterborne polyurethane

[0048] In parts by weight, under the condition of nitrogen protection, 120 parts of isophorone diisocyanate, 118 parts of polyoxypropylene diol with a molecular weight of 2000, and 70 parts of polyester polyol with a molecular weight of 200-400 were successively added to the container , 24 parts of sodium 1,2-dihydroxy-3-propanesulfonate, use a stirring device to stir the solution in the container, and heat slowly, when the temperature reaches 80°C, keep the temperature in the container at 80°C, so that After reacting the solution for five hours, take the sample liquid in the container to detect the NCO value. When the NCO is 4-4.3%, stop maintaining the temperature in the container, so that the temperature in the container is lowered, so as to obtain the NCO-capped preform for future use.

[0049] Add 19 parts of ethylenediamine and 650 parts of deionized water t...

technical field

[0001] The invention relates to the technical field of polyurethane, in particular to a water-based polyurethane ink resin and a preparation method thereof. Background technique

[0002] Ink is an important material for printing. It expresses patterns and characters on the substrate through printing. Ink is generally composed of pigments, binders, solvents and additives, etc. These components are evenly mixed and rolled repeatedly to form a viscous colloidal fluid. Ink is widely used in various printings such as books, periodicals, packaging and decoration, and architectural decoration; as social demand increases, ink varieties and output also expand and increase accordingly. The binder of the ink is usually water-based polyurethane, which is widely used for its excellent properties such as high and low temperature resistance, embrittlement resistance, friction resistance, strong adhesion, good flexibility, good elasticity and high tensile strength. [0003...

Examples

Embodiment 1

[0035] Preparation of polyester polyol

[0036]Because the present invention adopts prepolymer method to synthesize and prepare waterborne polyurethane, therefore, there are strict requirements for the molecular weight of linear polyester polyol, the molecular weight of polyester polyol is limited between 100-500, and the molecular weight of polyester polyol is between 100-500. It is better between 200-400. Polyester polyols need to be synthesized. In order to control the molecular weight of polyester polyols, therefore, diols in polyester polyols should be dibasic alcohols with small molecules, and dibasic acids in polyester polyols should be dibasic acids with small molecules. The dibasic alcohol in the polyester polyol can be made by one or more in ethylene glycol, propylene glycol, butanediol, neopentyl glycol and hexylene glycol, and the dibasic acid in the polyester polyol can be made from ethylene glycol One or more of diacid, malonic acid, glutaric acid and adipic aci...

Embodiment 2

[0041] The difference between embodiment 2 and embodiment 1 is:

[0042] Preparation of waterborne polyurethane

[0043] In parts by weight, under the condition of nitrogen protection, 100 parts of isophorone diisocyanate, 110 parts of polyoxypropylene diol with a molecular weight of 2000, and 60 parts of polyester polyol with a molecular weight of 200-400 are successively added to the container , 23 parts of sodium 1,2-dihydroxy-3-propanesulfonate, use a stirring device to stir the solution in the container, and heat it slowly. When the temperature reaches 80°C, keep the temperature in the container at 80°C, so that the solution in the container After reacting the solution for five hours, take the sample liquid in the container to detect the NCO value. When the NCO is 4-4.3%, stop maintaining the temperature in the container, so that the temperature in the container is lowered, so as to obtain the NCO-capped preform for future use.

[0044] Add 15 parts of ethylenediamine an...

Embodiment 3

[0046] The difference between embodiment 3 and embodiment 1 is:

[0047] Preparation of waterborne polyurethane

[0048] In parts by weight, under the condition of nitrogen protection, 120 parts of isophorone diisocyanate, 118 parts of polyoxypropylene diol with a molecular weight of 2000, and 70 parts of polyester polyol with a molecular weight of 200-400 were successively added to the container , 24 parts of sodium 1,2-dihydroxy-3-propanesulfonate, use a stirring device to stir the solution in the container, and heat slowly, when the temperature reaches 80°C, keep the temperature in the container at 80°C, so that After reacting the solution for five hours, take the sample liquid in the container to detect the NCO value. When the NCO is 4-4.3%, stop maintaining the temperature in the container, so that the temperature in the container is lowered, so as to obtain the NCO-capped preform for future use.

[0049] Add 19 parts of ethylenediamine and 650 parts of deionized water t...