Heat resistant modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of heat resistant modified alkaline phenolic resin self-hardening sand
A technology of heat-resistant modification and phenolic resin, which is applied in the field of resin sand, can solve the problems of easy pinholes in castings, difficulty in recycling and high gas generation, and achieve the effects of improved reusability, good plasticity and low viscosity
Inactive Publication Date: 2016-03-23
合肥李诺新材料贸易有限公司
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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
Method used
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Embodiment Construction
[0015] The resin sand in this example is prepared from the following raw materials in parts by weight: bauxite sand 70, calcite sand 20, nano-montmorillonite 0.1, mesoporous alumina 4, nano-copper 0.1, polypropylene slice 0.4, calcium carbonate 0.01, silane Joint agent 0.01, modified phenolic resin adhesive 1, curing agent 0.3.
[0016] Among them, the modified phenolic resin adhesive is made of the following raw materials in parts by weight: 0.2 octyl epoxy stearate, 0.1 silicone surfactant, 1 nano-alumina, 2 cellulose triacetate, 20 phenol, and the concentration is 35%. 20% formaldehyde solution, 30% potassium hydroxide solution 3, urea 1, silane coupling agent 0.1; the preparation method is: add phenol and formaldehyde into the reactor, heat to 60°C, stir and mix for 20min, then add hydrogen Potassium oxide solution, heated up to 80 °C for 4 hours, then added triacetate cellulose, urea, silicone surfactant, continued to stir and mix for 1.5 hours, cooled to room temperature...
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Abstract
The invention discloses heat resistant modified alkaline phenolic resin self-hardening sand for pump valve castings. An adopted modified phenolic resin adhesive in the resin sand has the advantages that the viscosity is low, the bonding strength is high, the plasticity is good, the brittleness is low, the contents of free phenol and free formaldehyde are lower, the use amount is lower, the hardening speed is decreased, and the like, so that the use and reuse performance of the molding sand can be effectively improved; nano-montmorillonite and nano copper composite porous polypropylene fibers blended in the sand have high strength and good toughness, and form complex and uniform meshy structures in a sand mold, so that the effect that the plasticity and air permeability of the molding sand are improved is achieved; and the added nano copper can effectively improve the heat resistance of resin and decrease the gas evolution amount, so that castings with higher quality are obtained.
Description
technical field [0001] The invention relates to the technical field of resin sand, in particular to a heat-resistant modified alkaline phenolic resin self-setting sand 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 industry because of...
Claims
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IPC IPC(8): B22C1/00B22C1/22B22C1/02
Inventor 李诺
Owner 合肥李诺新材料贸易有限公司