Rosin modified phenol-formaldehyde resin and preparation method therefor

Abstract

The invention discloses rosin modified phenol-formaldehyde resin. The rosin modified phenol-formaldehyde resin is prepared from the ingredients in percentage by mass: 25-40% of alkylphenol, 5-15% of paraformaldehyde, 0.1-0.5% of alkaline organic catalyst, 45-60% of rosin, 0.1-5% of adjuvants, 3-9% of polyol, 0.1-0.3% of esterification catalyst and 0.1-0.2% of antioxidant. The invention also discloses a preparation method for preparing the resin. According to the rosin modified phenol-formaldehyde resin and the preparation method therefor, the rosin modified phenol-formaldehyde resin product with high solubility, high structure, light color and low cost can be prepared; compared with the two-step method, the preparation method for the rosin modified phenol-formaldehyde resin has the advantages that a resin preparation process is simpler and easier to control, the emission of wastes is less, and the production is safer; and a restricted material, i.e., nonylphenol is not used, so that the production cost is lower.

Description

technical field [0001] The invention relates to the technical field of ink materials, in particular to a rosin-modified phenolic resin. Background technique [0002] The word "resin" originates from the secretions of certain trees. With the development of science and technology, people use chemical raw materials to synthesize resin products for various purposes, so the word "resin" is no longer the original simple meaning, but has become a general term for a class of high molecular weight or high molecular weight substances. [0003] Various properties of printing inks, such as viscosity, gloss, drying, firmness, rub resistance, water resistance and other resistances, are mostly determined by resins. In recent years, with the high speed of offset printing, resins for printing inks are generally required to have various high-speed printing suitability. The occurrence of flying ink during printing requires the use of high-viscosity and low-viscosity inks. For rosin-modified...

AI Technical Summary

Problems solved by technology

However, the two-step method and the one-step method have their own advantages and disadvantages. The traditional two-step method requires a large amount of alkaline catalyst to adjust the pH value due to the use of liquid formaldehyde in the reaction. , and some benzene solvents are often added, which makes the production process more dangerous, and there is a large amount of wastewater containing phenol and aldehyde, and the water treatment load is relatively large

Although the new two-step method adopts a no-clean process and uses solid formaldehyde in the reaction, a certain amount of water will still be added to improve the reaction effect during production. The waste water problem of this new two-step method has not been solved.

The traditional one-step resin process is relatively simple. Phenol and aldehyde react in the molten rosin, but due to the high viscosity of the molten rosin system and uneven dissolution, various side reactions occur

Moreover, the one-step reaction is phenolic condensation, and formaldehyde is generally excessive. Excessive formaldehyde will have side reactions with rosin, and there are disadvantages such as poor product quality control, low molecular weight of the resin, poor solubility, and excessively wide molecular weight distribution.

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