Preparation method for rosin modified phenolic resin

A technology for modifying phenolic resin and rosin, which is applied in the field of preparation of modified rosin, can solve the problems of high viscosity and good solubility, and achieve the effects of high softening point, good solubility and low acid value.

Inactive Publication Date: 2015-12-23
桂林兴松林化有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, rosin-modified phenolic resins were mainly modified with single alkylphenols, such as dodecylphenol, nonylphenol, p-tert-octylphenol, p-

Method used

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  • Preparation method for rosin modified phenolic resin
  • Preparation method for rosin modified phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Put rosin into the reaction kettle, raise the temperature to 180°C, add fumaric acid, the molar ratio of rosin to fumaric acid is 1:0.1, continue to heat up to 210°C and keep it warm for 1 hour to carry out the addition reaction;

[0014] 2) Add pentaerythritol and magnesium oxide to the reactor, the molar ratio of rosin to pentaerythritol is 1:1.1, cool down to 160°C, and add nonylphenol and p-tetraoctylphenol in a molar ratio of 1:1.05, Then continue to cool down to 130°C, then add paraformaldehyde at a ratio of phenolic molar ratio of 1:2.2, and keep warm at this temperature for 1 hour;

[0015] 3) Raise the temperature in the reactor to 260° C. and keep warm to carry out esterification reaction until the acid value is less than 25 mgKOH / g, and distill off low boilers under reduced pressure to obtain rosin-modified phenolic resin.

Embodiment 2

[0017] 1) Put rosin into the reaction kettle, raise the temperature to 180°C, add fumaric acid, the molar ratio of rosin to fumaric acid is 1:0.3, continue to heat up to 215°C and keep it warm for 1.5h to carry out the addition reaction;

[0018] 2) Add pentaerythritol and magnesium oxide to the reactor, the molar ratio of rosin to pentaerythritol is 1:1.3, cool down to 170°C, and add nonylphenol and p-tetraoctylphenol in a molar ratio of 1:1.08, Then continue to cool down to 140°C, then add paraformaldehyde at a ratio of phenol-formaldehyde molar ratio of 1:2.3, and keep warm at this temperature for 2 hours;

[0019] 3) Raise the temperature in the reactor to 270° C. and keep warm to carry out esterification reaction until the acid value is less than 25 mgKOH / g, and distill off low boilers under reduced pressure to obtain rosin-modified phenolic resin.

Embodiment 3

[0021] 1) Put rosin into the reaction kettle, raise the temperature to 180°C, add fumaric acid, the molar ratio of rosin to fumaric acid is 1:0.2, continue to heat up to 212°C and keep it warm for 1.2h to carry out the addition reaction;

[0022] 2) Add pentaerythritol and magnesium oxide to the reactor, the molar ratio of rosin to pentaerythritol is 1:1.2, cool down to 165°C, and add nonylphenol and p-tetraoctylphenol in a molar ratio of 1:1.06, Then continue to cool down to 135°C, then add paraformaldehyde at a ratio of phenol-formaldehyde molar ratio of 1:2.25, and keep warm at this temperature for 1.5h;

[0023] 3) Raise the temperature in the reactor to 265° C. and keep warm to carry out esterification reaction until the acid value is less than 25 mgKOH / g, and distill off low boilers under reduced pressure to obtain rosin-modified phenolic resin.

[0024] The resin of embodiment 1~3 is compared with existing resin as follows:

[0025]

[0026]

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Abstract

The invention provides a preparation method for rosin modified phenolic resin. The method comprises the following steps: 1) placing rosin into a reaction vessel, carrying out heating to 180 DEG C, adding trans-butenedioic acid, continuing heating to 210 to 215 DEG C and then carrying out heat preservation for 1 to 1.5 h, and carrying out addition reaction; 2) adding pentaerythritol and magnesium oxide into the reaction vessel, carrying out cooling to 160 to 170 DEG C, adding nonyl phenol and tert-octylphenol according to a molar ratio of 1: 1.05-1.08, then continuing cooling to 130 to 140 DEG C, adding paraformaldehyde according to a phenol-to-aldehyde molar ratio of of 1: 2.2-2.3, and carrying out heat preservation under the temperature for 1 to 2 h; and 3) raising the temperature in the reaction vessel to 260 to 270 DEG C, carrying out heat preservation and esterification reaction until an acid value is less than 25 mgKOH/g, and carrying out vaccum distillation until a low-boiling substance is distilled out, so the rosin modified phenolic resin is obtained. The resin prepared by using the method in the invention has the advantages of high viscosity, good solubility, large molecular weight, uniform distribution and applicability to offset lithographic ink.

Description

technical field [0001] The invention relates to a preparation method of modified rosin, in particular to a preparation method of rosin modified phenolic resin. Background technique [0002] Rosin-modified phenolic resin is based on the condensation reaction of alkylphenol and formaldehyde under the action of a basic catalyst, then an addition reaction with abietic acid, and then an esterification reaction between polyols and carboxyl groups on rosin to form a high molecular product. Because of its unique honeycomb structure characteristics, it has good pigment wetting performance, and at the same time it can react with an appropriate gel agent to obtain a certain viscoelastic binder, so it is widely used in lithographic offset printing inks. Due to the characteristics of the printing process of traditional offset lithographic inks, the binder requires low acid value, high viscosity, structural / high elasticity and high mineral oil tolerance (usually expressed in n-heptane to...

Claims

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Application Information

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IPC IPC(8): C08G8/34
Inventor 兰永新刘川董林鑫范辂
Owner 桂林兴松林化有限责任公司
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