Study on nonylphenol-formaldehyde resin inks

1 Introduction

Nonylphenol is an important raw material and intermediate for fine chemicals [1]. It is an excellent phenolic resin modifier. Its production and utilization have developed rapidly in foreign countries, and China is still in its infancy. Therefore, nonylphenol is being studied as nonylphenol. It is necessary to produce phenolic resin as a raw material, and then perform fine and deep processing. Applying it to ink, the use of nonylphenol was developed.

The resin that is an important part of the connecting material is the core of the ink, and its performance determines the quality grade of the ink. At present, the phenolic resin used in the ink connecting material in China is mainly produced by the action of tert-butylphenol, bisphenol A and aldehydes. It has low solubility in the use of performance, ink resin is always in the middle and low level, can not meet the domestic demand for high-grade ink, nonylphenol-formaldehyde resin used in ink connection material, through research has proved to be able to meet domestic high-grade ink The requirements of its synthesis method have not been reported in the literature.

2 experiments

2.1 raw materials and analysis methods

The softening point and acid value of rosin are measured according to GB-2616-81;

The formaldehyde content is determined by chlorination;

The free formaldehyde is measured according to GB7125-7126-81;

The viscosity is measured with a rotational viscometer;

Determination of the solid content is the constant temperature drying of the resin, according to the dry weight/dry weight × 100% before;

The hydroxymethyl content was analyzed according to [2].

2.2 Synthetic methods

The nonylphenol and water were added to the three-necked bottle, heated to 60°C with stirring, and the sodium hydroxide solution was added dropwise. After the system was clear and transparent, formaldehyde was added dropwise at 70-80°C within 15 hours and the reaction was measured for 3-6 hours. The effective methylol content was 60% to 70%, and the reaction was stopped. The pH was adjusted to 6 to 7 with hydrochloric acid and washed with water for use.

The rosin was added to the four-necked bottle, CO2 gas was introduced, and the phenol-formaldehyde syrup was added dropwise after heating and melting. The reaction was continued at 160-190° C. for 3 to 5 hours, and the reaction was stopped to obtain the connection product.

3 Results and Discussion

3.1 Effect of raw material mix

Using different nonylphenol-formaldehyde molar ratios, the amount of phenol on the phenolic syrup was measured as shown in Table 1. The combination reaction time and the amount of phenol were the molar ratio of phenol to formaldehyde of 1:2.1-2.2.

3.2 Rosin modified phenolic syrup reaction time selection

The process of the interaction between phenolic syrup and free rosin is a dehydration condensation reaction process, so the reaction time is determined by the dehydration rate. The results are shown in Table 2. The reaction time was determined to be 2.0-2.5 h.

3.2 Comparison of similar product indicators

The performance of the product compared with the performance of similar products at home and abroad are shown in Table 3. The comparison results show that the product has excellent performance.

3.4 Conclusion

(1) This article uses a phenolic syrup with an effective methylol content of 60% to 70%, which has a large solubility viscosity, overcomes the disadvantages of low molecular weight of other alkylphenol phenolic syrup resins, and poor print light properties.

(2) The use of long-chain para-alkylphenols increases the solubility of the resin.

(3) By changing the amount of phenolic syrup added, products of different specifications can be obtained, which expands the scope of use of the ink.

(4) The use of nonylphenol for the manufacture of ink binders has expanded the market for nonylphenol and opened up its application in the ink industry.


(Author/Liu Renli Li Gang Liu Renli Li Gang Dong Guojun)
Information source "Chemical Engineer"