Fluoride-free exothermic insulating riser and preparation method thereof
A thermal insulation riser, fluorine-free technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of insufficient heating of the riser, easy pollution of recycled sand, shrinkage and casting defects, etc., and achieve good heating effect , short production cycle, reduce shrinkage cavity and porosity effect
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specific Embodiment approach 1
[0015] Specific embodiment one: A kind of fluorine-free heat preservation riser in this embodiment is composed of 20~28 parts of expanded perlite, 10~25 parts of quartz sand, 18~25 parts of aluminum powder, 4~6 parts by weight. 18-25 parts of magnesium powder, 18-25 parts of iron oxide powder, 2-4 parts of potassium nitrate, 3-5 parts of sodium chloride, 2-3 parts of basic phenolic resin, 0.6-1.0 parts of organic ester and 0.02 parts ~0.03 parts of coupling agent.
[0016] This embodiment has the following advantages:
[0017] 1. Sodium chloride is used to replace fluorine salt in the riser prepared by this embodiment, which avoids the defects of fish eyes and easy pollution of recycled sand in ductile iron due to the accumulation of fluorine;
[0018] 2. The tensile strength of the riser prepared by this embodiment is higher than 1.2MPa 24 hours after demoulding, and the tensile strength after 15 days is still higher than 1.1MPa, which fully meets the production requirements...
specific Embodiment approach 2
[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the fluorine-free heat preservation riser is composed of 22 to 26 parts of expanded perlite, 15 to 20 parts of quartz sand, 20 to 22 parts of Aluminum powder, 4-6 parts of magnesium powder, 20-22 parts of iron oxide powder, 2-3 parts of potassium nitrate, 3-4 parts of sodium chloride, 2-3 parts of alkaline phenolic resin, 0.6-0.8 It is made of organic ester and 0.02-0.03 part of coupling agent. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the particle size of expanded perlite is 50 mesh to 70 mesh; The mud content of scrubbing sand with mesh ~ 140 mesh is less than 0.5%; the purity of aluminum powder is greater than 98%, and the particle size is 100 mesh to 200 mesh; the purity of iron oxide powder is greater than 95%, and the particle size is 100 mesh to 200 mesh; The pH value of the resin is 12-14, the mass fraction of free aldehydes is less than 0.2%, and the mass fraction of free phenols is less than 0.5%; the organic ester is glycerol acetate, and the purity of glycerol acetate is greater than 98%; the coupling agent is silane coupling Joint agent KH-550. Others are the same as those in the first or second embodiment.
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