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Preparation method of polyurethane resin for gravure composite ink

A technology of polyurethane resin and ink, which is applied in ink, application, and household appliances, etc., can solve the problems of low composite strength, poor adhesion, and poor color development, and achieve high composite strength, mild reaction, and strong polarity.

Active Publication Date: 2015-02-25
NANTONG GAOMENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a preparation method of polyurethane resin for gravure composite ink, which can solve the problem of poor adhesion, easy back-adhesion, and poor color development when the adhesive prepared by the current method is used in the ink. Problems such as low composite strength

Method used

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  • Preparation method of polyurethane resin for gravure composite ink
  • Preparation method of polyurethane resin for gravure composite ink
  • Preparation method of polyurethane resin for gravure composite ink

Examples

Experimental program
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Embodiment 1

[0040] The present embodiment provides a kind of preparation method of polyurethane resin for gravure composite ink, specifically comprises the following steps:

[0041] (1) Preparation of polyester polyol

[0042]

[0043]

[0044] Add 24 parts by mass of phthalic acid, 32 parts by mass of adipic acid, and 44 parts by mass of butanediol into the polyester synthesis kettle, raise the temperature to 200-240°C, and react for 5 hours until the acid value is less than 20. Esterification reaction: After the esterification reaction is completed, the temperature is lowered to 160°C, the vacuum pump is started, and the vacuum is kept at -0.094Mpa for 2 hours. After that, the vacuum degree is kept constant, and the temperature of the kettle is slowly raised for 5 hours to 210°C, after the total amount of the distillate reaches the theoretical value of 15 parts by mass, the distillate is released to obtain a polyester diol with an acid value of 0.6 and a hydroxyl value of 55;

[...

Embodiment 2

[0052] The present embodiment provides a kind of preparation method of polyurethane resin for gravure composite ink, specifically comprises the following steps:

[0053] (1) Preparation of polyester polyol

[0054]

[0055] Add 27 parts by mass of isophthalic acid, 23 parts by mass of adipic acid, and 50 parts by mass of neopentyl glycol into the polyester synthesis kettle, heat up to 200-240°C, and react for 5 hours to complete the esterification reaction; esterification After the reaction is completed, the temperature is lowered to 160°C, the vacuum pump is started, and the vacuum is kept at -0.094Mpa for 2 hours. After that, the vacuum is kept constant, and the temperature of the kettle is slowly raised to 210°C in 5 hours. After amounting to 20 parts by mass, emit a distillate to obtain a polyester polyol with an acid value of 0.3 and a hydroxyl value of 57;

[0056] (2) Preparation of NCO-terminated prepolymers:

[0057]

[0058] After mixing 56 parts by mass of p...

Embodiment 3

[0063] The present embodiment provides a kind of preparation method of polyurethane resin for gravure composite ink, specifically comprises the following steps:

[0064] (1) Preparation of polyester polyol

[0065]

[0066] Add 48 parts by mass of adipic acid and 52 parts by mass of diethylene glycol into the polyester synthesis kettle, raise the temperature to 200-240°C, and react for 5.5 hours to complete the esterification reaction; after the esterification reaction is completed, cool down to 160°C , start the vacuum pump, carry out vacuuming, keep the vacuum degree at -0.094Mpa, pump for 2 hours, after that, keep the vacuum degree constant, slowly increase the temperature of the kettle to 210°C in 5 hours, and after the total fraction reaches 25 parts by mass, Emit the distillate to obtain a polyester diol acid value of 0.9 and a hydroxyl value of 54;

[0067] (2) Preparation of NCO-terminated prepolymers:

[0068]

[0069] After mixing 76 parts by mass of polyeste...

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Abstract

The invention discloses a preparation method of polyurethane resin for gravure composite ink, wherein the polyurethane resin is alcohol ester-soluble polyurethane resin not containing free cyanate ester radicals. Large amounts of allophanate radicals are introduced into the resin so that the ink prepared from the resin has excellent adhesion fastness to substrates such as PET (Polyethylene Glycol Terephthalate), NY (Nylon) and PP (Polypropylene) and the like. The preparation method is characterized in that diisocyanate is reacted with high-molecular polyol to generate NCO-terminated prepolymers, and then the prepolymers are added into a solvent containing an amine chain extender to achieve the polyurethane resin for the ink. The soft and hard segment of the resin has the advantages of wide adjustable range, large cohesive energy, good anti-aftertack property and good heat resistance; and the prepared ink has high binding strength to various printing substrates and has high composite strength. The preparation method provided by the invention has obvious characteristics of stable reaction in the synthesis process of the resin, easiness in control of the preparation process, narrow distribution of the molecular weight and good dissolubility of the resin.

Description

technical field [0001] The invention relates to an adhesive for printing ink, in particular to a preparation method of a polyurethane resin for gravure composite ink which has excellent adhesion fastness, color development and anti-sticking to plastic films. Background technique [0002] Gravure inks currently used in the printing industry are generally made of chlorinated polypropylene. In the ink production process, chlorinated polypropylene needs to be dissolved with a strong solvent (such as toluene and other aromatic solvents), and toluene is also needed to adjust the viscosity of the ink during the printing process. Chlorinated polypropylene ink systems are now considered non-environmentally friendly. Because the chlorofluorocarbons it volatilizes during production will destroy the atmospheric ozone layer; in the ink production and printing process, the use of aromatic solvents such as toluene will harm the health and safety of workers. In addition, aromatic solvents...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32C08G18/12C09D11/102
Inventor 王登科沈峰
Owner NANTONG GAOMENG NEW MATERIAL
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