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Rosin polyester resin for lithography printing ink and synthetic method thereof

A rosin polyester resin, lithographic technology, applied in the field of ink and printing, can solve the problem that lithographic ink cannot be used

Active Publication Date: 2014-08-20
广西蒙山梧华林产科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ma Cuiping et al [invention patent application CN201010507547] used maleic anhydride and rosin addition reaction, and obtained rosin ester with higher softening point of 140-155°C through esterification with pentaerythritol, but the acid value was 150-170mgKOH / g, Too high for oil-based lithographic inks

Method used

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  • Rosin polyester resin for lithography printing ink and synthetic method thereof

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preparation example Construction

[0025] The synthetic method of rosin polyester resin for this planographic printing ink of the present invention, the method comprises the steps:

[0026] (1) Put the polymerized rosin or rosin derivatives into the reaction kettle according to the proportion, heat to 180°C with nitrogen gas, turn off the nitrogen gas and put in fumaric anhydride or maleic anhydride, stir evenly and raise the temperature to 200-240°C. Addition reaction, heat preservation at 200-240°C for 1-4 hours;

[0027] (2) Add polyol, metal oxide catalyst, vegetable oil or fatty acid after the addition reaction is terminated, raise the temperature of the reaction system to 255-280°C, measure the acid value and viscosity several times during the esterification reaction, when the acid value and Cool down and discharge when the viscosity reaches the product specification.

[0028] The product specifications described are: linseed oil viscosity (mPa.s / 25°C) 3000-10000, tolerance (n-heptane g / 3g) 1-20, acid va...

Embodiment -1

[0030] Put 100 parts of polymerized rosin into the reaction kettle, heat it to around 180°C, then add 5 parts of maleic anhydride, stir evenly, raise the temperature to 230°C, and keep it warm for 1 hour.

[0031] Add 8 parts of pentaerythritol, 2 parts of glycerin, and 1 part of zinc oxide after the heat preservation is over, and heat for 30 minutes.

[0032] Slowly raise the temperature to 275°C and blow nitrogen.

[0033] The esterification reaction was carried out at 275°C. Measure acid value and viscosity every 2 hours, when acid value is less than 30, when viscosity is about 3000, cooling discharge, obtain viscosity 3800, acid value 18, tolerance (n-heptane g / 3g) 3.9, molecular weight 20000, Light yellow solid resin with a softening point of 155°C.

Embodiment -2

[0035] Put 80 parts of polymerized rosin and 20 parts of rosin into the reaction kettle, heat it to 180°C, then add 6 parts of maleic anhydride, stir evenly, raise the temperature to 230°C, and keep it warm for 1 hour.

[0036] Add 9 parts of pentaerythritol, 2 parts of glycerin, and 1 part of zinc oxide after the heat preservation is over, and heat for 30 minutes.

[0037] Slowly raise the temperature to 275°C and blow nitrogen.

[0038] The esterification reaction was carried out at 275°C. Measure acid value and viscosity every 2 hours, when acid value is less than 30, when viscosity is about 10000, cooling discharge, obtain viscosity 9200, acid value 18, tolerance (n-heptane g / 3g) 3.5, molecular weight 21000, Light yellow solid resin with a softening point of 165°C.

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Abstract

The invention discloses a rosin polyester resin for lithography printing ink and a synthetic method thereof. The resin comprises, by weight, 100 portions of polymerized rosin or rosin derivatives, 1-10 portions of fumaric anhydride or maleic anhydride, 1-20 portions of vegetable oil or fatty acid, 5-20 portions of polyols and 0.1-3.0 portions of a metal oxide catalyst. Product specifications are as below: flaxseed oil viscosity of (mPa.s / 25 DEG C) 3000-10000, receiving degree (n-heptane g / 3 g) of 1-20, acid value (mgKOH / g) less than or equal to 30, softening point of 150-200 DEG C, and molecular weight (Mw) of 10000-300000. The invention has the following beneficial effects: the polyester has performances not inferior to those of the rosin modified phenolic resin, but not contains phenolic substances difficult to degrade in the environment and harmful to human body, and is an environment-friendly polyester resin compound, and applicable to harmless lithography printing ink for green printing.

Description

technical field [0001] The invention relates to the field of printing ink and printing, and mainly relates to a rosin polyester resin for lithographic printing ink and a synthesis method thereof. Background technique [0002] Rosin-modified phenolic resin is the most commonly used film-forming resin body in water-based sheetfed and rotary lithography or water-free lithographic printing inks. This kind of resin has good wettability with pigments, and the prepared ink has good fluidity, and has good water-ink balance with dampening water. The printed matter produced has high gloss, bright color and clear image. Therefore, there is currently no other resin that can replace it. [0003] Rosin modified phenolic resin is synthesized through a series of chemical reactions with natural rosin and phenolic aldehyde synthesized by petrochemical industry as the main raw materials. It is mainly composed of the addition reaction of the synthetic alkylphenol and aldehyde to the initial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/12C08G63/78C09F1/04C09D11/102
Inventor 陶霖西龚张水张锦强
Owner 广西蒙山梧华林产科技有限公司
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