Nanosized ceramic powder reinforced modified alkaline phenolic resin self-hardening sand for pump valve casting and preparation method of self-hardening sand

Abstract

The invention discloses a modified phenol resin adhesive adopted in nanosized ceramic powder reinforced modified alkaline phenolic resin self-hardening sand for a pump valve casting. The modified phenol resin adhesive has the advantages of being low in viscosity, high in bonding strength, good in plasticity, low in brittleness, lower in content of free phenol and free formaldehyde, less in use amount, slow in hardening rate and the like, and the use and reuse property of foundry sand can be effectively improved. Nanosized ceramic powder porous polypropylene fibers are mixed in sand aggregate have the significant effects of toughening and reinforcing, by means of the unique porous and fibrous structure, a complex uniform net-shaped structure can be formed in the foundry sand, the air permeability of the foundry sand is improved, and meanwhile the purpose of reinforcing is achieved; the heat stability of the foundry sand can be improved, collapse and scatter caused by impacts of molten metal can be prevented, and the yield is effectively increased.

Description

technical field [0001] The invention relates to the technical field of resin sand, in particular to a modified alkaline phenolic resin no-bake sand reinforced with nano ceramic powder for pump and valve castings and a preparation method thereof. Background technique [0002] Castings for pumps and valves have the characteristics of thin walls and complex shapes. In the casting process, the quality requirements for molding sand are particularly strict, and the quality of molding sand is also an important factor related to the quality of castings. Molding sand is mainly a kind of material used for molding in casting, which is made by mixing sand materials, adhesives and auxiliary substances according to different proportions. According to the different adhesives used, it can be divided into clay sand and water glass sand. , resin sand, etc. Among them, phenolic resin sand is widely used in the domestic foundry industry, and no-bake phenolic resin sand is widely used in the ind...

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Problems solved by technology

[0003] Although no-bake phenolic resin sand has its unique advantages, it also has some prominent shortcomings, mainly in high viscosity, high brittleness, high gas generation, easy pinholes in castings, high cost, and difficult recycling. etc., with the development of pump and valve castings in the direction of large-scale production and high precision, the development of high-efficiency, pollution-free, low-cost, and excellent comprehensive performance phenolic resin adhesives is an important prerequisite for casting high-quality castings