Brief Description of Alkali Phenolic Resin Sand

Subsidiary Classification： Product knowledge

Release time：2024-02-19

Alkaline phenolic resin self-hardening sand

Alkaline phenolic resin sand process, referred to as alkali phenolic process. In the process of pouring and cooling, there is no nitrogen, phosphorus, sulfur and other elements that can enter the molten steel to affect its quality, so there is basically no defect of sulfur seepage and needle-like pores in the surface layer of steel castings produced by furan resin. The free phenol and free aldehyde in alkaline phenolic resin are relatively low, and the curing agent is a mixture of glycerin acetate. In the process of sand mixing, modeling, core making, pouring and sand cleaning, it rarely releases toxic and irritating gases, which has no effect on the working environment. Alkaline phenolic resin is strongly alkaline, the acid consumption value of the raw sand is not high, can use alkaline raw sand, such as large-scale steel castings in the use of chromite sand.

Although ester hardening alkaline phenolic resin self-hardening sand has the above advantages and characteristics, this process also has some problems:

The strength of alkaline phenolic resin is relatively low, and the amount of resin added in the molding sand is relatively high, resulting in higher production costs; the poor regeneration performance of old sand increases the amount of new sand added, increases the emission of old sand, and increases The cost pollutes the environment.

In order to give full play to the advantages of alkaline phenolic resin self-hardening sand process and overcome its shortcomings, foundry workers have made remarkable achievements in the modification of resin/curing agent system, the use of special sand (such as ceramic sand), and the improvement of old sand regeneration process and equipment, so that this process can significantly reduce production costs, while producing high-quality steel castings efficiently and environmentally friendly. For example, a Japanese-funded enterprise in Anhui uses ceramic sand alkaline phenolic resin self-hardening sand process to produce wear-resistant parts such as stainless steel, manganese steel, high chromium cast iron, etc. The resin addition amount is 0.8-1%, and Japan's Xindong regeneration equipment is used. The LOI after regeneration can reach a minimum of 0.6, and the monthly ceramic sandsupplement amount is 2-3%. The casting quality is obviously improved, and both economic and environmental protection are achieved.

Keyword： Brief Description of Alkali Phenolic Resin Sand

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