Low-viscosity high-fluidity modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of self-hardening sand
A high-fluidity, phenolic resin technology, applied in the field of resin sand, can solve the problems of easy pinholes in castings, difficult recycling and high gas generation, and achieve the effects of improved use and reuse performance, good plasticity and low viscosity
Inactive Publication Date: 2016-03-30
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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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] The resin sand in this example is prepared from the following raw materials in parts by weight: reclaimed sand 50, bauxite 40, brucite powder 8, nano zinc oxide 0.5, polypropylene slice 0.4, polyaspartic acid 0.1, calcium carbonate 0.01, silane Coupling agent 0.01, modified phenolic resin adhesive 1, curing agent 0.3.
[0017] The modified phenolic resin adhesive used wherein is made of the following raw materials in parts by weight: 0.2 octyl epoxy stearate, 0.1 organic silicon surfactant, 1 nano-alumina, 2 cellulose triacetate, 20 phenol, and the concentration is 35% formaldehyde solution 20, 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 20 minutes Add potassium hydroxide solution, raise the temperature to 80°C and react for 4 hours, then add triacetate cellulose, urea, silicone surfactant, continue to stir and mix for 1.5 hours, cool to roo...
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Abstract
The invention discloses low-viscosity high-fluidity modified alkaline phenolic resin self-hardening sand for pump valve castings. A modified phenolic resin adhesive adopted by the resin self-hardening sand 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, smaller in usage amount, low in hardening speed and the like, and therefore the using performance and the reusing performance of the casting sand can be effectively improved; nanometer zinc oxide porous polypropylene fibers mixed in the sand have the effects of toughening, reinforcing, improving of air permeability and the like, and a complex and uniform meshed structure can be formed by the fibers in a sand mold, so that the bonding stability of the sand mold is improved, and the casting sand can be scattered and stripped more easily after pouring is completed; added polyaspartic acid can effectively lower the viscosity of the adhesive, so that fluidity of the sand is improved, sand mixing is easier, and production efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of resin sand, in particular to a low-viscosity and high-fluidity 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 in...
Claims
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IPC IPC(8): B22C1/00B22C1/02B22C1/22
CPCB22C1/00B22C1/02B22C1/2253
Inventor 李诺
Owner 合肥李诺新材料贸易有限公司